CN101860896B - A kind of method and apparatus determining the proprietary search volume of user - Google Patents

Abstract

The invention discloses a kind of method and apparatus determining the proprietary search volume of user, relative position between the candidate PDCCH that all can obtain under each polymerization grade of component carrier index, each component carrier between relative position and each component carrier between each candidate physical down control channel PDCCH in same index location, described index position refers to the numbering of the candidate PDCCH of each component carrier; According to acquired component carrier index and relative position information, it is determined that the proprietary search volume of user of monitoring PDCCH. The inventive method and device, all can determine the proprietary search volume of user in R10 version.

Description

Method and device for determining user-specific search space

Technical Field

The invention relates to the field of communication, in particular to a method and a device for determining a user-specific search space.

Background

A radio frame (radioframe) in a Long Term Evolution (LTE) system includes frame structures of a Frequency Division Duplex (FDD) mode and a Time Division Duplex (TDD) mode. The frame structure of the FDD mode is shown in fig. 1, where a 10 millisecond (ms) radio frame is composed of twenty slots (slots) with the length of 0.5ms and the number of 0-19, and the slots 2i and 2i +1 constitute a subframe (subframe) i with the length of 1 ms. The frame structure of TDD mode is shown in fig. 2, where a 10ms radio frame is composed of two half-frames (half-frames) with a length of 5ms, one half-frame includes 5 subframes with a length of 1ms, and subframe i is defined as 2 slots 2i and 2i +1 with a length of 0.5 ms. In the above two frame structures, for a standard cyclic prefix (NormalCP), one slot contains 7 symbols with a length of 66.7 microseconds (us), wherein the CP length of the first symbol is 5.21us, and the CP length of the remaining 6 symbols is 4.69 us; for an extended cyclic prefix (ExtendedCP, ExtendedCyclicPrefix), one slot contains 6 symbols, and the CP length of all symbols is 16.67 us.

The version number of LTE corresponds to R8(Release8), the version number corresponding to the added version is R9(Release9), and the version number of LTE-Advance in the future is R10(Release 10). The following three downlink physical control channels are defined in LTE: a physical downlink control format indicator channel (PCFICH); a physical hybrid automatic repeat request indicator channel (PHICH); a Physical Downlink Control Channel (PDCCH).

The information carried by the PCFICH is used to indicate the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols for transmitting the PDCCH in one subframe, and is sent on the first OFDM symbol of the subframe, and the frequency position of the first OFDM symbol is determined by the system downlink bandwidth and the cell Identity (ID).

The PHICH is used to carry acknowledgement/negative-acknowledgement (ACK/NACK) feedback information of uplink transmission data. The number and time-frequency position of the PHICH may be determined by a system message and a cell ID in a Physical Broadcast Channel (PBCH) of a downlink carrier where the PHICH is located.

The PDCCH is used for carrying Downlink Control Information (DCI), and includes: uplink and downlink scheduling information, and uplink power control information. The DCI formats (dciformats) are classified into the following: DCIformat0, DCIformat1, DCIformat1A, DCIformat1B, DCIformat1C, DCIformat1D, DCIformat2, DCIformat2A, DCIformat3, and DCIformat3A, and the like; wherein:

DCIformat0 is used to indicate scheduling of a Physical Uplink Shared Channel (PUSCH);

DCIformat1, DCIformat1A, DCIformat1B, DCIformat1C and DCIformat1D are used for different modes of one PDSCH codeword scheduling;

DCIformat2, DCIformat2A, and DCIformat2B are used for different modes of spatial multiplexing;

DCIformat3 and DCIformat3A are used for different modes of power control commands for a Physical Uplink Control Channel (PUCCH) and a PUSCH.

Physical resources transmitted by a physical downlink control channel PDCCH are in units of Control Channel Elements (CCEs), the size of one CCE is 9 Resource Element Groups (REGs), that is, 36 resource elements (resourceelements), and one PDCCH may occupy 1,2, 4, or 8 CCEs. For the four PDCCH sizes occupying 1,2, 4, 8 CCEs, tree-like aggregation (aggregation) is adopted, i.e. the PDCCH occupying 1 CCE may start from any CCE location; the PDCCH occupying 2 CCEs starts from an even CCE location; a PDCCH occupying 4 CCEs starts from an integer multiple of 4 CCE locations; PDCCHs occupying 8 CCEs start from CCE locations that are integer multiples of 8.

For each aggregation level (aggregation level), a search space (Searchspace) is defined, comprising a common (common) search space and a User Equipment (UE) Specific (UE-Specific) search space. The CCE number of the whole search space is determined by the number of OFDM symbols occupied by the control region indicated by the PCFICH in each downlink subframe and the number of PHICH groups. And the UE performs blind detection on all possible PDCCH code rates according to the DCIformat of the transmission mode in the search space.

In the k sub-frame, the control domain carrying PDCCH is numbered from a group of numbers 0 to N_CCE，kN of-1_CCE，kUE should detect a group of candidate PDCCHs in each non-discontinuous reception (non-DRX) subframe to acquire control information, wherein the detection refers to decoding the PDCCHs in the group according to all DCIformat to be detected, the candidate PDCCHs (PDCCHScandidate) to be detected are defined in a space searching mode, and aggregation level (aggregation level) L ∈ {1, 2, 4, 8} is searched for spaceDefined by a set of candidate PDCCHs. Search spaceThe CCE corresponding to m of the medium candidate PDCCH is defined by:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceThe number of candidate PDCCHs to be detected in the process.

For common search space (common search space), Y_kL is 0, 4 and 8;

for a UE-specific search space (UE-specific search space), L is 1,2, 4, 8;

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs a corresponding Radio Network Temporary Identifier (RNTI).

The UE should detect one common search space each with an aggregation level of 4 and 8 and one UE-specific search space each with an aggregation level of 1,2, 4, 8, and the common search space and the UE-specific search space may overlap. The specific detection times and corresponding search spaces are shown in table 1:

TABLE 1

The following transmission mode (transmissionmode) may be set based on a higher-layer signaling semi-static (semi-static) and PDSCH data transmission may be received as indicated by PDCCH of a user equipment-Specific (UE-Specific) search space:

mode 1: a single antenna port; port0 (Single-antiport; port 0);

mode 2: transmit diversity (transmit diversity);

mode 3: open-loop spatial multiplexing (Open-loop spatial multiplexing);

mode 4: closed-loop spatial multiplexing (Closed-loop spatial multiplexing);

mode 5: multi-user multiple input multiple output (Multi-usermmo);

mode 6: closed-loop Rank 1precoding (Closed-loop Rank 1 precoding);

mode 7: a single antenna port; port5 (Single-antiport; port 5);

if the UE is set by the higher layer to perform PDCCH decoding with Cyclic Redundancy Check (CRC) scrambled with cell radio network temporary identity (C-RNTI), the UE should decode the PDCCH and all related PDSCHs according to the corresponding combinations defined in table 2:

TABLE 2

If the UE is set by the higher layer to perform PDCCH decoding with CRC scrambled with Semi-persistent scheduling cell radio network temporary identifier (SPSC-RNTI), the UE should decode the PDCCH and all related PDSCHs according to the corresponding combination defined in the following table 3:

TABLE 3

If the UE is set by the higher layer to perform PDCCH decoding with CRC scrambled with transmission power control uplink control channel cell radio network temporary identifier (TPC-PUCCH-RNTI), TransmitPowerControl-PUCCH-cellradio network temporary identifier, the UE should decode the PDCCH according to the corresponding combination defined in the following table 4:

DCI format	Search space
		3/3A	Common search spaces

TABLE 4

If the UE is set by the higher layer to perform PDCCH decoding with CRC scrambled with transmission power control uplink shared channel cell radio network temporary identifier (TPC-PUSCH-RNTI, TransmitPowerControl-PUSCH-cellradio network temporary identifier), the UE should decode the PDCCH according to the corresponding combination defined in the following table 5:

DCI format	Search space
		3/3A	Common search spaces

TABLE 5

Since the LTE-Advanced network needs to be able to access LTE users, its operating band needs to cover the current LTE band, but there is no distributable continuous 100MHz spectrum bandwidth on this band, so the LTE-Advanced network needs to aggregate several continuous component carrier frequencies (spectrums) distributed on different bands by using carrier aggregation (CarrierAggregation) technology to form the 100MHz bandwidth that the LTE-Advanced can use. I.e. for the aggregated spectrum, is divided into n component carrier frequencies (spectra), the spectrum within each component carrier frequency (spectrum) being continuous.

In a carrier aggregation scenario, the 3GPP may schedule a plurality of component carriers in a cross component carrier scheduling (cross component carrier scheduling), that is, may monitor PDCCHs of other component carriers on a certain component carrier. Then, a Carrier Indicator Field (CIF) needs to be added to the dcifomat to determine a component carrier corresponding to the monitored PDCCH.

At present, during cross-carrier scheduling, it is generally agreed that a user-specific search space needs to be reasonably determined in the R10 version to expand the user-specific search space of the original R8 version, so as to solve the problem of blocking rate caused by multiple component carriers. However, at present, there is no specific scheme for expanding the user-specific search space, so that the problem of the blocking rate caused by multiple component carriers cannot be solved, thereby bringing inconvenience to practical application.

Disclosure of Invention

In view of the above, the main object of the present invention is to provide a method and apparatus for determining a user-specific search space, so as to determine the user-specific search space in the R10 version.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a method of determining a user-specific search space, the method comprising:

acquiring the index of the component carrier, the relative position between the candidate PDCCHs under each aggregation level of each component carrier and the relative position between the candidate PDCCHs at the same index position between the component carriers, wherein the index position refers to the number of the candidate PDCCHs of each component carrier;

and determining a user-specific search space for monitoring the PDCCH according to the acquired component carrier index and the relative position information.

The relative position between the candidate PDCCHs under each aggregation level of each component carrier is changed, and the relative position between the candidate PDCCHs at the same index position between the component carriers is fixed;

the method for determining the user-specific search space comprises the following steps:

method of producing a composite materialFirst, at aggregation level L, component carrier j has W available positions in the whole search space, and the value of W is preferablyWherein N is_CCE，kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; determining K (i) according to the number of component carriers or a carrier indication field when i is from 1 to Q and i is from Q +2 to N for all aggregation levels of all component carriers if N is greater than 1; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

or, in the second method, in the aggregation level L, the component carrier j has W available positions in the whole search space, and the value of W is preferably WWherein N is_CCE，kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of all component carriers, if N is greater than 1, k (i) is taken to be 1 when i is from 1 to Q, and i is from Q +2 to N; when i is Q +1, according to one of the total number of CCEs, the aggregation level, the number of PDCCH candidates and the number of component carriersOr a plurality of determinations K (i); if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N.

When all component carrier indexes are ordered, and two adjacent component carrier indexes are a and b, the method for determining the spacing between the candidate PDCCHs comprises the following steps:

in a first method, in an aggregation level L, the PDCCH candidates of two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between their ith PDCCH candidates is equal to P (i, a, L) -P (i, b, L), and h (i) is 1, or determined according to an aggregation level and a carrier indication field, or determined according to the aggregation level and the number of component carriers;

in the second method, in the aggregation level L, the PDCCH candidates of the two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between the ith PDCCH candidates is determined according to the aggregation level and the number of PDCCH candidates, or according to the aggregation level, the number of PDCCH candidates and the carrier indication field.

The relative position between candidate PDCCHs is fixed under each aggregation level of each component carrier, but the relative position between the candidate PDCCHs on the same index position among the component carriers is changed;

the method for determining the user-specific search space comprises the following steps:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of each component carrier, k (i) for the same component carrier is a fixed value for all i, which may be any one of 1 to W, but k (i) for different component carriers may be different values. (ii) a

The positions of PDCCH candidates of two adjacent component carriers with component carrier indexes a and b are P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L); for all aggregation levels, H (i) of all adjacent component carriers takes a random value according to the difference of i, or increases according to the increase of i, or decreases according to the increase of i, and the value of H (i) ranges from any value of 1 to W.

Under each aggregation level of each component carrier, the relative position among the candidate PDCCHs is changed, and the relative position among the candidate PDCCHs at the same index position among the component carriers is changed;

the method for determining the user-specific search space comprises the following steps:

at each aggregation level, all candidate PDCCHs of respective component carriers are randomly distributed over the entire user-specific search space.

Under each aggregation level of each component carrier, the relative position between each candidate PDCCH is fixed, and the relative position between the candidate PDCCHs at the same index position between each component carrier is fixed;

the method for determining the user-specific search space comprises the following steps:

under each aggregation level of each component carrier, the candidate PDCCHs of one component carrier are distributed on a user-specific search space at equal intervals, and the candidate PDCCHs of the other component carrier are placed next to the candidate PDCCHs of the first component carrier at the same index position of the candidate PDCCHs corresponding to the first component carrier; the candidate PDCCH is configured with the other component carriers immediately preceding the last component carrier in this way.

The component carrier indexes comprise component carrier indexes corresponding to component carriers implementing cross-carrier scheduling and the component carriers scheduled by the cross-carrier;

the method for obtaining the component carrier index comprises the following steps:

under the condition of enabling cross-carrier scheduling, setting indexes corresponding to component carriers implementing cross-carrier scheduling as 0 aiming at component carrier indexes corresponding to the component carriers, and arranging the rest component carriers needing cross-carrier scheduling according to the frequency point height in the order from big to small or from small to big;

or, under the condition that cross-carrier scheduling is enabled, setting indexes corresponding to component carriers implementing cross-carrier scheduling to be a specified value 0 aiming at component carrier indexes corresponding to the component carriers, and arranging all the component carriers according to the high-low order of frequency points; according to the ranking order, starting from the component carrier implementing cross-carrier scheduling, allocating the component carrier indexes of other component carriers immediately after the appointed value in a cycle;

or, under the condition of cross-carrier scheduling enabling, aiming at the component carrier indexes corresponding to the component carriers, arranging the component carriers according to the frequency point height and the sequence from big to small or from small to big;

or, under the condition of cross-carrier scheduling enabling, the component carrier index corresponding to each component carrier is equal to the carrier indication field CIF value corresponding to each component carrier;

or, when cross-carrier scheduling is enabled, the component carrier indexes corresponding to the component carriers are configured through high-level signaling.

In a carrier aggregation scene of LTE-Advanced, when cross-carrier scheduling is enabled, an uplink component carrier is the same as a user-specific search space to be monitored of a corresponding downlink component carrier; the method further comprises the following steps:

and monitoring the DCIformat to be monitored on the uplink component carrier on the determined user-specific search space.

A device for determining a user-specific search space comprises a reference factor acquisition unit and a search space decision unit; wherein,

the reference factor acquiring unit is used for acquiring the index of the component carrier, the relative position between the candidate PDCCHs under each aggregation level of each component carrier and the relative position between the candidate PDCCHs at the same index position between the component carriers; sending the obtained component carrier index and relative position information to the search space decision unit, wherein the index position refers to the number of the candidate PDCCH of each component carrier;

and the search space decision unit is used for determining a user-specific search space for monitoring the PDCCH according to the received component carrier index and the relative position information.

Under each aggregation level of each component carrier, the relative position among the candidate PDCCHs is changed, and the relative position among the candidate PDCCHs at the same index position among the component carriers is fixed;

the search space decision unit, when determining the user-specific search space, is to:

in the first application method, at the aggregation level L, the component carrier j has W available positions in the whole search space, and the value of W is preferably WWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the ith PDCCH candidate for component carrier j is in W available positionsIs P (i, j, L), N spacing between PDCCH candidates is k (i) ═ P (i +1, j, L) -P (i, j, L), i ═ 1,2,. N, the value of N is the number of PDCCH candidates minus 1; determining K (i) according to the number of component carriers or a carrier indication field when i is from 1 to Q and i is from Q +2 to N for all aggregation levels of all component carriers if N is greater than 1; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

or, when applying the second method, the component carrier j has W available positions in the whole search space under the aggregation level L, and the value of W is preferably WWherein N is_CCE，kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of all component carriers, if N is greater than 1, k (i) is taken to be 1 when i is from 1 to Q, and i is from Q +2 to N; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N.

When all component carrier indexes are sorted, and the adjacent two component carrier indexes are a and b,

in a first method, in an aggregation level L, the PDCCH candidates of two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between their ith PDCCH candidates is equal to P (i, a, L) -P (i, b, L), and h (i) is 1, or determined according to an aggregation level and a carrier indication field, or determined according to the aggregation level and the number of component carriers;

in the second method, in the aggregation level L, the PDCCH candidates of the two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between the ith PDCCH candidates is determined according to the aggregation level and the number of PDCCH candidates, or according to the aggregation level, the number of PDCCH candidates and the carrier indication field.

The relative position between candidate PDCCHs is fixed under each aggregation level of each component carrier, but the relative position between the candidate PDCCHs on the same index position among the component carriers is changed;

the search space decision unit, when determining the user-specific search space, is to:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; all aggregation for each component carrier, etcStage, k (i) for the same component carrier is a fixed value for all i, which may be any one of 1 to W, but k (i) for different component carriers may be different values. (ii) a

The positions of PDCCH candidates of two adjacent component carriers with component carrier indexes a and b are P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L); for all aggregation levels, H (i) of all adjacent component carriers takes a random value according to the difference of i, or increases according to the increase of i, or decreases according to the increase of i, and the value of H (i) ranges from any value of 1 to W.

Under each aggregation level of each component carrier, the relative position among the candidate PDCCHs is changed, and the relative position among the candidate PDCCHs at the same index position among the component carriers is changed;

the search space decision unit, when determining the user-specific search space, is to:

at each aggregation level, all candidate PDCCHs of respective component carriers are randomly distributed over the entire user-specific search space.

Under each aggregation level of each component carrier, the relative position between each candidate PDCCH is fixed, and the relative position between the candidate PDCCHs at the same index position between each component carrier is fixed;

the search space decision unit, when determining the user-specific search space, is to:

under each aggregation level of each component carrier, the candidate PDCCHs of one component carrier are distributed on a user-specific search space at equal intervals, and the candidate PDCCHs of the other component carrier are placed next to the candidate PDCCHs of the first component carrier at the same index position of the candidate PDCCHs corresponding to the first component carrier; the candidate PDCCH is configured with the other component carriers immediately preceding the last component carrier in this way.

The component carrier indexes comprise component carrier indexes corresponding to component carriers implementing cross-carrier scheduling and the component carriers scheduled by the cross-carrier;

the reference factor acquiring unit is configured to, when acquiring the component carrier index:

under the condition of enabling cross-carrier scheduling, setting indexes corresponding to component carriers implementing cross-carrier scheduling as 0 aiming at component carrier indexes corresponding to the component carriers, and arranging the rest component carriers needing cross-carrier scheduling according to the frequency point height in the order from big to small or from small to big;

or, under the condition that cross-carrier scheduling is enabled, setting indexes corresponding to component carriers implementing cross-carrier scheduling to be a specified value 0 aiming at component carrier indexes corresponding to the component carriers, and arranging all the component carriers according to the high-low order of frequency points; according to the ranking order, starting from the component carrier implementing cross-carrier scheduling, allocating the component carrier indexes of other component carriers immediately after the appointed value in a cycle;

or, under the condition of cross-carrier scheduling enabling, aiming at the component carrier indexes corresponding to the component carriers, arranging the component carriers according to the frequency point height and the sequence from big to small or from small to big;

or under the condition of enabling cross-carrier scheduling, randomly distributing indexes for component carrier indexes corresponding to all component carriers;

or, under the condition of cross-carrier scheduling enabling, corresponding component carrier indexes are allocated for the CIF values corresponding to the component carriers;

or, when cross-carrier scheduling is enabled, the component carrier indexes corresponding to the component carriers are configured through high-level signaling.

In a carrier aggregation scene of LTE-Advanced, when cross-carrier scheduling is enabled, an uplink component carrier is the same as a user-specific search space to be monitored of a corresponding downlink component carrier; the device further comprises a detection unit;

the search space decision unit is further used for sending the user-specific search space information required in the detection to the detection unit;

the detecting unit is configured to monitor the DCIformat that needs to be monitored on the uplink component carrier in the determined user-specific search space.

The method and the device can determine the user-specific search space in the R10 version.

Drawings

Fig. 1 is a diagram illustrating a frame structure of an FDD mode in the prior art;

FIG. 2 is a diagram illustrating a frame structure of a TDD mode in the prior art;

FIG. 3 is a diagram of a prior art user-specific search space of version R8;

FIG. 4 is a diagram illustrating a user-specific search space according to a first embodiment of the present invention;

FIG. 5 is a diagram illustrating a user-specific search space according to a second embodiment of the present invention;

FIG. 6 is a schematic diagram of a user-specific search space according to a third embodiment of the present invention;

FIG. 7 is a diagram illustrating a user-specific search space according to a fourth embodiment of the present invention;

FIG. 8 is a diagram illustrating a user-specific search space according to a fifth embodiment of the present invention;

FIG. 9 is a simplified flow chart for determining a user-specific search space in accordance with the present invention;

FIG. 10 is a diagram of an apparatus for determining a user-specific search space according to an embodiment of the present invention.

Detailed Description

In general, when cross-carrier scheduling is enabled, reference factors for determining a user-specific search space may be obtained: and determining a user-specific search space for monitoring the PDCCH by the UE according to the reference factors. The index position refers to the number of the candidate PDCCH of each component carrier, and the component carrier indexes include component carrier indexes corresponding to component carriers implementing cross-carrier scheduling and cross-carrier scheduling.

For the user-specific search space corresponding to each component carrier implementing cross-carrier scheduling and being cross-carrier scheduled, the relative position between each candidate PDCCH may be fixed or variable under each aggregation level condition on each component carrier; similarly, the relative position between candidate PDCCHs at the same index position between component carriers may be fixed or variable. Also, for the component carrier index of each component carrier, the component carrier index may be configured according to the number of component carriers configured to the user equipment by the base station.

When configuring the component carrier index, the component carrier index of the component carrier implementing cross-carrier scheduling may be set to a specified value, where the specified value is 0, and may be represented as 000 in binary representation; all the other component carriers scheduled by the cross carrier configure component carrier indexes according to the sequence of the frequency point positions of the component carriers and the appointed value;

or, the component carrier index of the component carrier implementing cross-carrier scheduling is set to a specified value, the specified value is 0, and the binary representation can be represented as 000; arranging all the component carriers according to the high-low sequence of the respective frequency points, starting from the component carrier implementing cross-carrier scheduling according to the arrangement sequence, and circularly allocating the component carrier indexes of other component carriers next to the specified value;

or configuring component carrier indexes in a high-low sequence according to the respective frequency point positions of the component carriers implementing cross carrier scheduling and being subjected to cross carrier scheduling;

or, configuring the component carrier index according to the carrier indication domain of each component carrier configured to the user equipment by the base station.

Alternatively, the component carrier index is configured by a higher layer signaling configuration.

Furthermore, in the carrier aggregation scenario of LTE-Advanced, when cross-carrier scheduling is enabled, the uplink component carrier is the same as the user-specific search space that the corresponding downlink component carrier needs to monitor; the downlink control information format DCIformat to be monitored on the uplink component carrier may be monitored on the determined user-specific search space.

In specific application, the user-specific search space of the PDCCH can be determined according to the following four methods:

a first user-specific search space determining method:

the relative position between the PDCCH candidates varies per aggregation level condition on each component carrier, but the relative position between the PDCCH candidates at the same index position between the component carriers is fixed.

The user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, there are two configurations:

configuring a first step: at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; determining K (i) according to the number of component carriers or a carrier indication field when i is from 1 to Q and i is from Q +2 to N for all aggregation levels of all component carriers if N is greater than 1; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

in the aggregation level L, the PDCCH candidates of the component carriers with the adjacent two component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and then the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L), and h (i) is 1, or determined according to the aggregation level and the carrier indication field, or determined according to the aggregation level and the number of component carriers;

the values of k (i) may be different, for example, k (i) 2, where i is a value other than M^(L)All other values than/2, K (M)^(L)/2) may be from 0 toAny value of (1). And each value of h (i) is fixed, e.g., 1. Then, f (m, I) can be defined with reference to the following formula:

wherein, the NumCC is the number of component carriers configured to the user, may also be the number of active component carriers configured to the user, may also be the maximum number of component carriers of the current system, and may also be a fixed value, and this fixed value may be configured by a high layer signaling; n is 1 to M^(L)Of (e.g. M)^(L)2; offset1(m) ═ k (m), which can be taken from 0 to m at each m condition with reference to offset1Any one value of, e.g.OrWherein P is any positive integer, and can be taken as 2 or NumCC, etc., and offset1(0) is taken as 0 at this time; offset2 ═ h (i), which can be referred to as offset2 ═ h (i) ═ 1; alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Denotes rounding down, n_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI. The rest of the design is the same as in the LTERelease8 version. One user-specific search space design of version R8 is shown in fig. 3, while a user-specific search space designed according to the above-described method is shown in fig. 4.

Configuring a second step: at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of all component carriers, if N is greater than 1, k (i) is taken to be 1 when i is from 1 to Q, and i is from Q +2 to N; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N.

In the aggregation level L, the PDCCH candidates of the two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and then the distance h (i) between their ith PDCCH candidates is P (i, a, L) -P (i, b, L), where h (i) is determined according to the aggregation level and the number of PDCCH candidates, or according to the aggregation level, the number of PDCCH candidates and the carrier indication field.

The respective values of k (i) may be different, for example, k (i) 1, where i is a value other than M^(L)All other values than/2, K (M)^(L)/2) may be from 0 toAny value of (a); and each value of H (i) is fixed. For another example, all are M^(L)/2. Then, f (m, I) can be defined with reference to the following formula:

wherein n is any one of 1 to M (L), e.g. M^(L)2; offset1(m) ═ k (m), which can be taken from 0 to m at each m condition with reference to offset1Any one value of, e.g.OrWherein the NumCC is the number of component carriers configured to the user and can also be the number of component carriers configured to the userThe number of activated component carriers of (1) may also be the maximum number of component carriers of the current system, or may also be a fixed value, which may be configured by higher layer signaling, P is a positive integer, and may be 2 or NumCC, etc., and at this time, offset1(0) takes 0; offset2 ═ h (i), which can be referred to as offset2 ═ h (i) ═ M^(L)/2. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI. The remaining design is the same as in the LTERelease8 version, and the user-specific search space designed in accordance with the above method is shown in fig. 5.

The second user-specific search space determining method:

the relative position between the PDCCH candidates is fixed for each aggregation level condition on each component carrier, but the relative position between the PDCCH candidates at the same index position among the component carriers varies.

The user equipment may change the search space in R8Corresponding to m of the medium candidate PDCCHCCE formula to determine user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration is possible:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of each component carrier, k (i) for the same component carrier is a fixed value for all i, which may be any one of 1 to W, but k (i) for different component carriers may be different values. The positions of PDCCH candidates of two adjacent component carriers with component carrier indexes a and b are P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L); for all aggregation levels, H (i) of all adjacent component carriers takes a random value according to the difference of i, or increases according to the increase of i, or decreases according to the increase of i, and the value of H (i) ranges from any value of 1 to W.

The values of k (i) are fixed, for example,while the values of H (i) may be different, e.g. H (i) is from 0 toAny one value of (1). Then, f (m, I) can be defined with reference to the following formula:

f(m，I)＝m·offset1(I)+I·offset2(m)；

wherein, the value of offset1(I) is a fixed value under each I condition, for example, the value of offset1(0) isThe value of offset1(1) isoffset2 ═ h (m), which can take values from 0 to m per m condition with reference to offset2Any one value of (1). Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0；A＝39827；D＝65537；Represents rounding down; n is_sIs the slot number in a radio frame. n is_RNTIIs the corresponding RNTI. The remaining design is the same as in the LTERelease8 version, with the user-specific search space designed as described above as shown in fig. 6.

The third user-specific search space determination method:

the relative position between the candidate PDCCHs varies for each aggregation level condition on each component carrier, and the relative position between the candidate PDCCHs at the same index position varies for each component carrier.

At aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kIs the number of CCEs in the k-th subframe. The position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i equals 1, 2. The PDCCH candidates of the two adjacent component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L).

The user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration is possible:

all of their candidate PDCCHs are randomly distributed over the entire user-specific search space for each component carrier at each aggregation level.

The values of K (i) are different and the values of H (i) are different, e.g. K (i) and H (i) are from 0 toAny one of the above values; and their values are different from each other. Then, f (m, I) can be defined with reference to the following formula:

f(m，I)＝offset1(m)+I·offset2(m)；

wherein, offset1(m) ═ k (m), offset2(m) ═ h (m), and their values can be 0 to m in each m condition with reference to offset1 and offset2And here offset1(0) is 0. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

Alternatively, offset1 and offset2 may be derived from the following equations:

offset1＝n_RNTI+2¹⁶·I+2¹⁹m or offset1 ═ n_RNTI+2¹⁶·m；

offset2＝n_RNTI+2¹⁶·I+2¹⁹M or offset2 ═ n_RNTI+2¹⁶·m；

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI. The remaining design is the same as in the lterease 8 version, with the user-specific search space designed as described above as shown in fig. 7.

A fourth user-specific search space determination method:

the relative position between the candidate PDCCHs is fixed under each aggregation level condition on each component carrier, and the relative position between the candidate PDCCHs on the same index position between the component carriers is also fixed.

At aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kIs the number of CCEs in the k-th subframe. The position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i equals 1, 2. Adjacent to each otherThe PDCCH candidates for the two component carriers with component carrier indices a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L).

The user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration is possible:

under each aggregation level, the candidate PDCCHs of one component carrier are distributed on a user-specific search space at equal intervals, and the candidate PDCCHs of the other component carrier are arranged next to the candidate PDCCHs of the first component carrier at the same index position corresponding to the candidate PDCCHs of the first component carrier; the other component carriers configure their PDCCH candidates in this way immediately preceding the component carrier.

The values of k (i) are fixed, for example,and each value of h (i) is also fixed, e.g., 1.Then, f (m, I) can be defined with reference to the following formula:

f(m，I)＝m·offset1+I·offset2；

where, k (i) is referred to as offset1, its value can be referred tooffset2 ═ h (i), which may be referred to as offset2 ═ h (i) ═ 1. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI. The remaining design is the same as in the LTERelease8 version, and the user-specific search space designed in accordance with the above method is shown in fig. 8.

Through the description of f (m, I) by the four methods, according to the formula:

a modulo operation is performed to finalize the user-specific search space.

In practical application, the component carrier index of each component carrier may be configured as follows:

in the case of enabling cross-carrier scheduling, for the component carrier index I corresponding to each component carrier, the component carrier index I corresponding to each component carrier implementing cross-carrier scheduling and being cross-carrier scheduled may be predefined, such as: the corresponding index of the component carrier wave implementing cross carrier wave scheduling is set to be 0, and the rest component carrier waves needing cross carrier wave scheduling are arranged according to the frequency point height and the sequence from big to small, or the sequence from small to big, and the value range is from 1 to 4.

Or, in the case of enabling cross-carrier scheduling, for the component carrier index I corresponding to each component carrier, the component carrier index I corresponding to each component carrier implementing cross-carrier scheduling and being cross-carrier scheduled may be predefined, such as: setting the index corresponding to the component carrier implementing cross carrier scheduling as a designated value 0, arranging all the component carriers according to the high-low order of the frequency points, and according to the arrangement order, starting from the component carrier implementing cross carrier scheduling, circularly allocating the component carrier indexes of other component carriers next to the designated value, wherein the value range is from 1 to 4.

Or, in the case of enabling cross-carrier scheduling, for the component carrier index I corresponding to each component carrier, the component carrier index I corresponding to each component carrier implementing cross-carrier scheduling and being cross-carrier scheduled may be predefined, such as: the component carriers are arranged according to the frequency point from high to low, or from low to high, and the value range is from 0 to 4.

Or, when cross-carrier scheduling is enabled, for the component carrier index I corresponding to each component carrier, the corresponding component carrier index I may be allocated according to the CIF value corresponding to each component carrier implementing cross-carrier scheduling and being cross-carrier scheduled, and the value range is from 0 to 7. For example, if the CIF value is 010, the component carrier index I is 2.

Or, in the case of cross-carrier scheduling enabling, the component carrier index I corresponding to each component carrier may be configured through high-level signaling, and the value range is from 0 to 7.

In addition, in a carrier aggregation scenario of LTE-Advanced, when cross-carrier scheduling is enabled, an uplink component carrier is the same as a user-specific search space that a downlink component carrier corresponding to the uplink component carrier needs to be monitored, and on the determined user-specific search space, the UE monitors a downlink control information format DCIformat that needs to be monitored on the uplink component carrier.

In a particular application, the following specific examples may be referenced to determine a user-specific search space.

The first concrete example is as follows:

in the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1,2, 3, 4} or {0, 1,2, 3, 4, 5, 6, 7 }.

Then, when cross-carrier scheduling is enabled, the user-specific search space for PDCCH monitoring may be determined according to the component carriers that need to be scheduled, and the user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; determining K (i) according to the number of component carriers or a carrier indication field when i is from 1 to Q and i is from Q +2 to N for all aggregation levels of all component carriers if N is greater than 1; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

in the aggregation level L, the PDCCH candidates of the component carriers with the adjacent two component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and then the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L), and h (i) is 1, or determined according to the aggregation level and the carrier indication field, or determined according to the aggregation level and the number of component carriers;

the definition of f (m, I) can be referred to the following formula:

the NumCC is the number of component carriers configured to the user, may also be the number of activated component carriers configured to the user, may also be the maximum number of component carriers of the current system, and may also be a fixed value, which may be configured by a high-level signaling, where P is any positive integer, and may be 2 or NumCC, and the like.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI.

After the design of f (m, I), according to the formula:

a modulo operation is performed to finalize the user-specific search space.

Specific example two:

in the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1,2, 3, 4} or {0, 1,2, 3, 4, 5, 6, 7 }.

Then, when cross-carrier scheduling is enabled, the user-specific search space for PDCCH monitoring may be determined according to the component carriers that need to be scheduled, and the user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), i ═ 1, 2.N, wherein the value of N is the number of the candidate PDCCHs minus 1; for all aggregation levels of all component carriers, if N is greater than 1, k (i) is taken to be 1 when i is from 1 to Q, and i is from Q +2 to N; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N.

In the aggregation level L, the PDCCH candidates of the two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and then the distance h (i) between their ith PDCCH candidates is P (i, a, L) -P (i, b, L), where h (i) is determined according to the aggregation level and the number of PDCCH candidates, or according to the aggregation level, the number of PDCCH candidates and the carrier indication field.

The definition of f (m, I) can be referred to the following formula:

the NumCC is the number of component carriers configured to the user, may also be the number of activated component carriers configured to the user, may also be the maximum number of component carriers of the current system, and may also be a fixed value, where the fixed value may be configured by a high layer signaling, P is a positive integer, and may be 2 or NumCC, and so on.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI.

After the design of f (m, I), according to the formula:

a modulo operation is performed to finalize the user-specific search space.

Specific example three:

in the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1,2, 3, 4} or {0, 1,2, 3, 4, 5, 6, 7 }.

Then, when cross-carrier scheduling is enabled, the user-specific search space for PDCCH monitoring can be determined according to the component carriers needing scheduling, and the user equipment can change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration is possible:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W preferably beingWherein N is_CCE，kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of each component carrier, k (i) for the same component carrier is a fixed value for all i, which may be any one of 1 to W, but k (i) for different component carriers may be different values. The positions of PDCCH candidates of two adjacent component carriers with component carrier indexes a and b are P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L); for all aggregation levels, H (i) of all adjacent component carriers takes a random value according to the difference of i, or increases according to the increase of i, or decreases according to the increase of i, and the value of H (i) ranges from any value of 1 to W.

The definition of f (m, I) can be referred to the following formula:

f(m，I)＝m·offset1(I)+I·offset2(m)；

wherein, the offset1(I) takes a fixed value under each I condition, for example, the value of offset1(0) isThe value of offset1(1) isThe value of offset2 can be referred to as taking 0 to mFor example, offset2(0) is 0, offset2(1) is 1, offset2(2) is 2, offset2(3) is 3, offset2(4) is 4, and offset2(5) is 5. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI.

After the design of f (m, I), according to the formula:

a modulo operation is performed to finalize the user-specific search space.

Specific example four:

in the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1,2, 3, 4} or {0, 1,2, 3, 4, 5, 6, 7 }.

Then, when cross-carrier scheduling is enabled, the user-specific search space for PDCCH monitoring may be determined according to the component carriers that need to be scheduled, and the user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

Specifically, the following configuration is possible:

all of their candidate PDCCHs are randomly distributed over the entire user-specific search space for each component carrier at each aggregation level.

The definition of f (m, I) can be referred to the following formula:

f(m，I)＝offset1(m)+I·offset2(m)；

the values of offset1 and offset2 can be referred to as taking 0 to mAny one of the values, for example, offset1(0) is 0, offset1(1) is 5, offset1(2) is 7, offset1(3) is 3, offset1(4) is 2, and offset1(5) is 1; offset2(0) is 0, offset2(1) is 1, offset2(2) is 2, offset2(3) is 3, offset2(4) is 4, and offset2(5) is 5. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

Alternatively, offset1 and offset2 may be derived from the following equations:

offset1＝n_RNTI+2¹⁶·I+2¹⁹m or offset1 ═ n_RNTI+2¹⁶·m；

offset2＝n_RNTI+2¹⁶·I+2¹⁹M or offset2 ═ n_RNTI+2¹⁶·m；

For the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs oneA slot number in a radio frame; n is_RNTIIs the corresponding RNTI.

After the design of f (m, I), according to the formula:

a modulo operation is performed to finalize the user-specific search space.

The fifth concrete example:

in the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1,2, 3, 4} or {0, 1,2, 3, 4, 5, 6, 7 }.

Then, when cross-carrier scheduling is enabled, the user-specific search space for PDCCH monitoring may be determined according to the component carriers that need to be scheduled, and the user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is represented by a component carrier index IAnd m as a function of the inputs.

Specifically, the following configuration is possible:

under each aggregation level, the candidate PDCCHs of one component carrier are distributed on the whole user-specific search space at equal intervals, the candidate PDCCHs of the other component carrier are arranged next to the candidate PDCCHs of the first component carrier at the same index position of the candidate PDCCHs corresponding to the first component carrier, and the other component carriers are configured with the candidate PDCCHs next to the previous component carrier.

The definition of f (m, I) can be referred to the following formula:

for the first component carrier, or the component carrier with the component carrier index of 0, the starting position of the first PDCCH candidate at each aggregation level may be determined according to the following method:

Y_k＝(A·Y_k-1)modD；

wherein, Y_-1＝n_RNTI≠0，A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI.

After the design of f (m, I), according to the formula:

a modulo operation is performed to finalize the user-specific search space.

A specific example six:

in the LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, a higher layer notifies a physical layer which other component carriers need to be scheduled on a certain component carrier, that is, an index of the component carrier is obtained, where a parameter of the index may be set to be I, and a value range of the index is {0, 1,2, 3, 4} or {0, 1,2, 3, 4, 5, 6, 7 }.

Then, when cross-carrier scheduling is enabled, the user-specific search space for PDCCH monitoring may be determined according to the component carriers that need to be scheduled, and the user equipment may change the search space in R8Determining a CCE formula corresponding to m of the medium candidate PDCCH to determine a user-specific search space:

wherein, i is 0, 1, M is 0, …, M^(L)-1，M^(L)For searching spaceNumber of candidate PDCCHs to be examined, N_CCE，kThe number of CCEs carrying the PDCCH control field for the kth subframe, f (m, I) is a function with the component carrier indices I and m as input.

The configuration of the component carrier index I is as follows:

the component carrier index of the component carrier implementing cross-carrier scheduling may be set to a specified value, which is 0 and may be represented as 000 in binary representation; all the other component carriers scheduled by the cross carrier configure component carrier indexes according to the sequence of the frequency point positions of the component carriers and the appointed value;

or, the component carrier index of the component carrier implementing cross-carrier scheduling is set to a specified value, the specified value is 0, and the binary representation can be represented as 000; arranging all the component carriers according to the high-low sequence of the respective frequency points, starting from the component carrier implementing cross-carrier scheduling according to the arrangement sequence, and circularly allocating the component carrier indexes of other component carriers next to the specified value;

or configuring component carrier indexes in a high-low sequence according to the respective frequency point positions of the component carriers implementing cross carrier scheduling and being subjected to cross carrier scheduling;

or, configuring the component carrier index according to the carrier indication domain of each component carrier configured to the user equipment by the base station.

Alternatively, the component carrier index is configured by a higher layer signaling configuration.

For Y_kThe following determination methods are available:

Y_k＝(A·Y_k-1)modD；

or Y_k＝(A·Y_k-1+ g (I) modD, where g (I) has a preferred value of 2¹⁶·I；

Or Y_k＝(A·Y_k-1+ g (I, m)) modD, where g (I) has a preferred value of 2¹⁶·I+2¹⁹·m。

Wherein, Y_-1＝n_RNTI≠0，

Or Y_-1＝n_RNTI+ g (I) ≠ 0, where a preferred value for g (I) is 2¹⁶·I；

Or Y_-1＝n_RNTI+ g (I, m) ≠ 0, with g (I) having a preferred value of 2¹⁶·I+2¹⁹·m。A＝39827，D＝65537，Represents rounding down; n is_sIs a time slot number in a wireless frame; n is_RNTIIs the corresponding RNTI.

And f (m, I) can be defined by the following method:

wherein, the NumCC is the number of component carriers configured to the user, may also be the number of active component carriers configured to the user, may also be the maximum number of component carriers of the current system, and may also be a fixed value, and this fixed value may be configured by a high layer signaling; n is 1 to M^(L)Of (e.g. M)^(L)2; offset1(m) whose value can be taken from 0 to m for each condition of m with reference to offset1Any one value of, e.g.OrWherein P is any positive integer, and can be taken as 2 or NumCC, etc., and offset1(0) is taken as 0 at this time; the value of offset2 can refer to offset2 as 1; alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

Wherein n is 1 to M^(L)Of (e.g. M)^(L)2; offset1(m) whose value can be taken from 0 to m for each condition of m with reference to offset1Any one value of, e.g.OrWherein, the NumCC is the number of the component carriers configured to the user, or the number of the activated component carriers configured to the user, or the maximum number of the component carriers of the current system, or a fixed value, and the fixed value can be configured by the high-level signaling; p is a positive integer, and may be taken as 2 or NumCC, etc., and offset1(0) is taken as 0 at this time; the value of offset2 can be referred to as offset2 ═ M^(L)/2. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

3)f(m，I)＝m·offset1(I)+I·offset2(m)；

Wherein, the value of offset1(I) is a fixed value under each I condition, for example, the value of offset1(0) isThe value of offset1(1) isThe value of offset2 can be 0 to m for each m condition with reference to offset2Any one value of (1). Alternatively, the values of offset1 and offset2 may also be signaled by higher layersThe configuration may be defined as any positive integer.

4)f(m，I)＝offset1(m)+I·offset2(m)；

Wherein, the values of offset1(m) and offset2(m) can be 0 to 2 in each m condition with reference to offset1 and offset2And here offset1(0) is 0. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

Alternatively, offset1 and offset2 may be derived from the following equations:

offset1＝n_RNTI+2¹⁶·I+2¹⁹m or offset 1-nrntiti +2¹⁶·m；

offset2＝n_RNTI+2¹⁶·I+2¹⁹M or offset2 ═ n_RNTI+2¹⁶·m；

5)f(m，I)＝m·offset1+I·offset2；

Wherein, the value of offset1 can be referred toThe value of offset2 can be referred to as offset2 being 1. Alternatively, the values of offset1 and offset2 may be configured by higher layer signaling, or may be fixedly defined as any positive integer.

As can be appreciated in conjunction with the above technical description, the operational idea of the present invention for determining a user-specific search space can be represented as shown in FIG. 9. Referring to fig. 9, fig. 9 is a simplified flowchart of the process of determining the user-specific search space according to the present invention, where the process includes the following steps:

step 910: and acquiring the index of the component carrier, the relative position between the candidate PDCCHs under the condition of each aggregation level on each component carrier and the relative position between the candidate PDCCHs at the same index position between the component carriers. Currently, there are various specific ways to obtain the above-mentioned reference factors, such as: and obtaining the configuration information from the communication signaling of the UE or searching the configuration table entry.

Step 920: and determining a user-specific search space for monitoring the PDCCH according to the acquired component carrier index and the relative position information.

In order to ensure that the above operation can be smoothly performed, an arrangement as shown in fig. 10 may be performed. Referring to fig. 10, fig. 10 is a diagram of an apparatus for determining a user-specific search space according to an embodiment of the present invention, where the apparatus includes a reference factor obtaining unit and a search space decision unit connected to each other. Wherein the reference factor acquiring unit is configured to acquire a reference factor that can determine the user-specific search space: the index of the component carrier, the relative position between the candidate PDCCHs under the condition of each aggregation level on each component carrier and the relative position between the candidate PDCCHs at the same index position between the component carriers are obtained, the obtained reference factors are sent to a search space decision unit, and the search space decision unit determines the user-specific search space for monitoring the PDCCHs according to the received reference factors.

It should be noted that, in the carrier aggregation scenario of LTE-Advanced, when cross-carrier scheduling is enabled, the uplink component carrier is the same as the user-specific search space that the corresponding downlink component carrier needs to monitor, and on applying the above technical description to determine the user-specific search space, the UE monitors the downlink control information format DCIformat that needs to be monitored on the uplink component carrier. The detection operation can be completed by a detection unit connected with the search space decision unit, and the content such as the user-specific search space information required for detection can be sent to the detection unit by the search space decision unit.

The specific operations that can be performed by the above units have been described in detail in the foregoing embodiments, and are not described herein again.

In summary, the technology for determining the user-specific search space in the invention, regardless of the method or the device, solves the problem of how to define the user-specific search space for monitoring the PDCCH by the UE when cross-carrier scheduling is enabled in the carrier aggregation scene of LTE-Advanced; and then the problem of the blocking rate caused by a plurality of component carriers is solved, and the inconvenience brought to practical application in the communication process by the problem is avoided.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, and any modifications, equivalents, improvements, etc. that are within the spirit and principle of the present invention should be included in the present invention.

Claims (8)

1. A method of determining a user-specific search space, the method comprising:

acquiring the index of the component carrier, the relative position between the candidate Physical Downlink Control Channels (PDCCH) under each aggregation level of each component carrier and the relative position between the candidate PDCCHs at the same index position between the component carriers, wherein the index position refers to the number of the candidate PDCCHs of each component carrier;

determining a user-specific search space for monitoring the PDCCH according to the acquired component carrier index and the relative position information;

wherein, determining the user-specific search space for monitoring the PDCCH according to the obtained component carrier index and the relative location information specifically includes one of:

under each aggregation level of each component carrier, the relative position between the candidate PDCCHs is changed, the relative position between the candidate PDCCHs at the same index position between the component carriers is changed, and all the candidate PDCCHs of each component carrier are randomly distributed on the whole user-specific search space under each aggregation level of each component carrier;

under each aggregation level of each component carrier, the relative position between the candidate PDCCHs is fixed, the relative position between the candidate PDCCHs at the same index position between the component carriers is fixed, under each aggregation level of each component carrier, the candidate PDCCHs of one component carrier are distributed on a user-specific search space at equal intervals, and the candidate PDCCHs of the other component carrier are placed at the same index position of the candidate PDCCHs corresponding to the first component carrier and next to the candidate PDCCHs of the first component carrier; configuring candidate PDCCHs of other component carriers immediately before the last component carrier in the mode;

if the relative position between the candidate PDCCHs under each aggregation level of each component carrier is changed, the relative position between the candidate PDCCHs at the same index position between the component carriers is fixed;

the method for determining the user-specific search space comprises the following steps:

method one, under aggregation level L, component carrier j has W available positions in the whole search space, and the value of W isWherein N is_CCE,kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all the componentsDetermining K (i) according to the number of component carriers or carrier indication fields if N is greater than 1 when i is from 1 to Q and i is from Q +2 to N; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

or, in the second method, in the aggregation level L, the component carrier j has W available positions in the whole search space, and the value of W isWherein N is_CCE,kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of all component carriers, if N is greater than 1, k (i) is taken to be 1 when i is from 1 to Q, and i is from Q +2 to N; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

if the relative position between the candidate PDCCHs is fixed under each aggregation level of each component carrier, but the relative position between the candidate PDCCHs at the same index position among the component carriers is changed;

the method for determining the user-specific search space comprises the following steps:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W beingWherein N is_CCE,kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of each component carrier, k (i) for the same component carrier is a fixed value for all i, which is any one of 1 to W, but k (i) for different component carriers is a different value;

the positions of PDCCH candidates of two adjacent component carriers with component carrier indexes a and b are P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L); for all aggregation levels, H (i) of all adjacent component carriers takes a random value according to the difference of i, or increases according to the increase of i, or decreases according to the increase of i, and the value of H (i) ranges from any value of 1 to W.

2. The method of claim 1, wherein: the relative position between candidate PDCCHs under each aggregation level of each component carrier is changed, the relative position between candidate PDCCHs at the same index position between the component carriers is fixed, when all component carrier indexes are ordered, and the indexes of two adjacent component carriers are a and b, the method for determining the spacing between the candidate PDCCHs is as follows:

in a first method, in an aggregation level L, the PDCCH candidates of two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between their ith PDCCH candidates is equal to P (i, a, L) -P (i, b, L), and h (i) is 1, or determined according to an aggregation level and a carrier indication field, or determined according to the aggregation level and the number of component carriers;

in the second method, in the aggregation level L, the PDCCH candidates of the two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between the ith PDCCH candidates is determined according to the aggregation level and the number of PDCCH candidates, or according to the aggregation level, the number of PDCCH candidates and the carrier indication field.

3. The method according to claim 1 or 2, wherein the component carrier indexes comprise component carrier indexes corresponding to component carriers implementing cross-carrier scheduling and cross-carrier scheduling;

the method for obtaining the component carrier index comprises the following steps:

under the condition of enabling cross-carrier scheduling, setting indexes corresponding to component carriers implementing cross-carrier scheduling as 0 aiming at component carrier indexes corresponding to the component carriers, and arranging the rest component carriers needing cross-carrier scheduling according to the frequency point height in the order from big to small or from small to big;

or, under the condition that cross-carrier scheduling is enabled, setting indexes corresponding to component carriers implementing cross-carrier scheduling to be a specified value 0 aiming at component carrier indexes corresponding to the component carriers, and arranging all the component carriers according to the high-low order of frequency points; according to the ranking order, starting from the component carrier implementing cross-carrier scheduling, allocating the component carrier indexes of other component carriers immediately after the appointed value in a cycle;

or, under the condition of cross-carrier scheduling enabling, aiming at the component carrier indexes corresponding to the component carriers, arranging the component carriers according to the frequency point height and the sequence from big to small or from small to big;

or, under the condition of cross-carrier scheduling enabling, the component carrier index corresponding to each component carrier is equal to the carrier indication field CIF value corresponding to each component carrier;

or, when cross-carrier scheduling is enabled, the component carrier indexes corresponding to the component carriers are configured through high-level signaling.

4. The method of claim 3, wherein in an LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, the uplink component carrier is the same as a user-specific search space that the corresponding downlink component carrier needs to monitor; the method further comprises the following steps:

and monitoring a downlink control information format DCIformat to be monitored on the uplink component carrier on the determined user-specific search space.

5. An apparatus for determining a search space specific to a user, the apparatus comprising a reference factor obtaining unit, a search space decision unit; wherein,

the reference factor acquiring unit is used for acquiring the index of the component carrier, the relative position between the candidate PDCCHs under each aggregation level of each component carrier and the relative position between the candidate PDCCHs at the same index position between the component carriers; sending the obtained component carrier index and relative position information to the search space decision unit, wherein the index position refers to the number of the candidate PDCCH of each component carrier;

if the relative position between the candidate PDCCHs is changed and the relative position between the candidate PDCCHs at the same index position between the component carriers is changed at each aggregation level of the component carriers,

the search space decision unit is used for randomly distributing all candidate PDCCHs of all component carriers on a whole user-specific search space under each aggregation level of all the component carriers;

if the relative position between the PDCCH candidates is fixed at each aggregation level of the component carriers, the relative position between the PDCCH candidates at the same index position between the component carriers is fixed,

the search space decision unit is used for distributing the candidate PDCCHs of one component carrier on a user-specific search space at equal intervals under each aggregation level of each component carrier, and placing each candidate PDCCH of the other component carrier next to each candidate PDCCH of the first component carrier at the same index position of each candidate PDCCH corresponding to the first component carrier; configuring candidate PDCCHs of other component carriers immediately before the last component carrier in the mode;

if the relative position between the candidate PDCCHs is changed under each aggregation level of each component carrier, the relative position between the candidate PDCCHs at the same index position between the component carriers is fixed;

the search space decision unit, when determining the user-specific search space, is to:

in the first application method, under the aggregation level L, the component carrier j has W available positions in the whole search space, and the value of W isWherein N is_CCE,kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; determining K (i) according to the number of component carriers or a carrier indication field when i is from 1 to Q and i is from Q +2 to N for all aggregation levels of all component carriers if N is greater than 1; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

or, when the second method is applied, the component carrier j has W available positions in the whole search space under the aggregation level L, and the value of WIs composed ofWherein N is_CCE,kIs the number of CCEs in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of all component carriers, if N is greater than 1, k (i) is taken to be 1 when i is from 1 to Q, and i is from Q +2 to N; when i is Q +1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers; if N is less than or equal to 1, determining K (i) according to one or more of the total number of CCEs, the aggregation level, the number of candidate PDCCHs and the number of component carriers;

wherein,or Q is other positive integer between 1 and N;

if the relative position between the candidate PDCCHs is fixed under each aggregation level of each component carrier, but the relative position between the candidate PDCCHs at the same index position among the component carriers is changed;

the search space decision unit, when determining the user-specific search space, is to:

at aggregation level L, component carrier j has W available positions in the entire search space, with the value of W beingWherein N is_CCE,kThe number of Control Channel Elements (CCEs) in the kth subframe; the position of the ith PDCCH candidate of component carrier j in the W available positions is P (i, j, L), and the N spacings between PDCCH candidates are k (i) ═ P (i +1, j, L) -P (i, j, L), where i ═ 1, 2.. N, and the value of N is the number of PDCCH candidates minus 1; for all aggregation levels of each component carrier, k (i) for the same component carrier is a fixed value for all iIs any one of 1 to W, but k (i) for different component carriers is a different value;

the positions of PDCCH candidates of two adjacent component carriers with component carrier indexes a and b are P (i, a, L) and P (i, b, L), and the distance h (i) between their i-th PDCCH candidates is P (i, a, L) -P (i, b, L); for all aggregation levels, H (i) of all adjacent component carriers takes a random value according to the difference of i, or increases according to the increase of i, or decreases according to the increase of i, and the value of H (i) ranges from any value of 1 to W.

6. The apparatus of claim 5, wherein relative positions between the PDCCH candidates vary at each aggregation level of the component carriers, relative positions between PDCCH candidates at the same index position between the component carriers are fixed, and when all component carrier indexes are ordered and two adjacent component carrier indexes are a and b,

in a first method, in an aggregation level L, the PDCCH candidates of two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between their ith PDCCH candidates is equal to P (i, a, L) -P (i, b, L), and h (i) is 1, or determined according to an aggregation level and a carrier indication field, or determined according to the aggregation level and the number of component carriers;

in the second method, in the aggregation level L, the PDCCH candidates of the two component carriers with component carrier indexes a and b are located at P (i, a, L) and P (i, b, L), and the distance h (i) between the ith PDCCH candidates is determined according to the aggregation level and the number of PDCCH candidates, or according to the aggregation level, the number of PDCCH candidates and the carrier indication field.

7. The apparatus of claim 5 or 6, wherein the component carrier index comprises a component carrier index corresponding to each component carrier implementing cross-carrier scheduling and cross-carrier scheduling;

the reference factor acquiring unit is configured to, when acquiring the component carrier index:

under the condition of enabling cross-carrier scheduling, setting indexes corresponding to component carriers implementing cross-carrier scheduling as 0 aiming at component carrier indexes corresponding to the component carriers, and arranging the rest component carriers needing cross-carrier scheduling according to the frequency point height in the order from big to small or from small to big;

or, under the condition that cross-carrier scheduling is enabled, setting indexes corresponding to component carriers implementing cross-carrier scheduling to be a specified value 0 aiming at component carrier indexes corresponding to the component carriers, and arranging all the component carriers according to the high-low order of frequency points; according to the ranking order, starting from the component carrier implementing cross-carrier scheduling, allocating the component carrier indexes of other component carriers immediately after the appointed value in a cycle;

or, under the condition of cross-carrier scheduling enabling, aiming at the component carrier indexes corresponding to the component carriers, arranging the component carriers according to the frequency point height and the sequence from big to small or from small to big;

or under the condition of enabling cross-carrier scheduling, randomly distributing indexes for component carrier indexes corresponding to all component carriers;

or, under the condition of cross-carrier scheduling enabling, corresponding component carrier indexes are allocated for the CIF values corresponding to the component carriers;

or, when cross-carrier scheduling is enabled, the component carrier indexes corresponding to the component carriers are configured through high-level signaling.

8. The apparatus of claim 7, wherein in an LTE-Advanced carrier aggregation scenario, when cross-carrier scheduling is enabled, an uplink component carrier is the same as a user-specific search space that a corresponding downlink component carrier needs to monitor; the device further comprises a detection unit;

the search space decision unit is further used for sending the user-specific search space information required in the detection to the detection unit;

the detecting unit is configured to monitor the DCIformat that needs to be monitored on the uplink component carrier in the determined user-specific search space.