CN101945479A - Device and methods for transmitting random access preamble signal - Google Patents

Abstract

The invention provides methods for transmitting a random access preamble signal, in particular to method for collocating RACH (Random Access Channel) resources in a TDD (Time Division Duplex) system. The methods comprises a method for collocating a RACH and a SRS (Sounding Reference Signal), a method for collocating multi-RACH in an UpPTS (Uplink Pilot Time Slot) by the time division multiplexing mode, and a method for collocating CP (Cyclic Prefix) added RACH in the UpPTS.

Description

The equipment of transmitting random access preamble signal and method

The application is to be Chinese patent application " equipment of transmitting random access preamble signal and the method " (application number: dividing an application 200810002414.2) on January 7th, 2008 applying date.

Technical field

The present invention relates to wireless communication system, relate to the equipment and the method for the transmitting random access preamble signal in wireless communication system in particular.

Background technology

Now, 3GPP standardization body has set about beginning its existing system standard is carried out long-term evolution (LTE).In the middle of numerous physical layer transmission technology, be the focus of research based on the downlink transfer technology of OFDM (OFDM) with based on the uplink technology that single-carrier frequency division multiple access inserts (SCFDMA).

In the following description, be that 30.72MHz is that example is described with the sampling frequency, when subcarrier spacing was 15KHz, effectively the sampling number of OFDM symbol was 2048 like this, correspondingly, and sampling interval T_s=1/ (15000 * 2048).To other sampling frequency, corresponding effectively sampling number of OFDM symbol and the sampling number of CP can obtain according to the ratio of sampling frequency.

The LTE system comprises two types frame structure, and the frame structure Class1 adopts Frequency Division Duplexing (FDD) (FDD), andframe structure type 2 adopts time division duplex (TDD).The system design problem of LTE TDD mainly is discussed here.According to present discussion result, Fig. 1 is the frame structure of LTE TDD system.Each length is 307200 * T_sIt is 153600 * T that the radio frames of=10ms (radio frame) is divided into two length_sThe field of=5ms.It is 15360T that each field comprises 8 length_sThe time slot of=0.5ms and 3 special domain, i.e. descending pilot frequency time slot (DwPTS), protection be (GP) and uplink pilot time slot (UpPTS) at interval, the length of these 3 special domain be 30720T_s=1ms.Each time slot comprises a plurality of OFDM symbols, and the CP of OFDM symbol has two kinds, promptly general CP and lengthening CP.Use the time slot of general CP to comprise 7 OFDM symbols, use the time slot of lengthening CP to comprise 6 OFDM symbols.Using the CP length of first OFDM symbol of the time slot of general CP is 160 * T_s(about 5.21 μ s), the CP length of other 6 OFDM symbols is 144 * T_s(4.69 μ s); The CP length of each OFDM symbol of the time slot of use lengthening CP is 512 * T_s(16.67 μ s).Two continuous time slots constitute a subframe (subframe), andsubframe 1 andsubframe 6 comprise 3 above-mentioned special domain.According to present discussion result,subframe 0,subframe 5 and DwPTS are fixed for downlink transfer; To the 5ms change-over period, UpPTS,subframe 2 andsubframe 7 are fixed for uplink, and to the 10ms change-over period, UpPTS,subframe 2 are fixed for uplink.

According to the discussion result of LTE TDD, can transmit ascending data, arbitrary access front signal (preamble) among the UpPTS and be used for the reference signal (SRS) of channel probe.Fig. 2 is the structure of arbitrary access front signal, and it comprises length is T_CPCyclic Prefix and length be T_SEQSequence.Several targeting signal structures of definition see the following form at present:

Table one: the parameter of arbitrary access front signal

The targeting signal form	TCP	TSEQ
			?0	3152×Ts	24576×Ts

?1	21012×Ts	24576×Ts
			?2	6224×Ts	2×24576×Ts
?3	21012×Ts	2×24576×Ts
			4 (only being used for frame structure type 2)	0×Ts	4096×Ts

Targeting signal format 4 in the table one only is used for LTE TDD system, its sequence length T_SEQBe 4096 * T_s, promptly be equivalent to the time span of two up SCFDMA symbols; Its CP length T_CPBe 0, promptly do not add CP.The characteristics of this form are that the length of arbitrary access front signal is short, generally are to transmit in the UpPTS of LTETDD system.According to present discussion result, the RACH signal of this form shifts to an earlier date 5120 * T from the UpPTS end position_sBegin to send.Like this, at the base station receiving terminal, the length before its UpPTS end position is 5120 * T_sTime period in comprise arbitrary access front signal.Following this arbitrary access front signal that transmits is abbreviated as short RACH in UpPTS.

Discussion result according to current LTE, ascending control channel (PUCCH) distributes at the two ends of frequency band, thereby avoid up shared data channel (PUSCH) to be divided into a plurality of frequency bands by PUCCH, this is because subscriber equipment sends upstream data and will destroy its single-carrier nature on a plurality of frequency bands that frequency is separated, and causes cubic metric (CM) to increase.Fig. 3 is the schematic diagram of the frequency location of RACH in the LTE FDD system.On the timing position of each RACH, its possible frequency location has two, lays respectively at the two ends of band system band, and adjacent with PUCCH.The method of the frequency location of this configuration RACH also is for fear of the single-carrier property of destroying PUSCH.According to current discussion result, in LTE FDD system, only dispose a random access channel resource on the timing position of each RACH.Control the collision probability of RACH by configuration RACH density in time.In order to obtain the effect of frequency diversity, RACH is frequency hopping on two possible positions shown in Figure 3.To LTE TDD system, be subjected to the restriction of its up-downgoing change-over period, may on the timing position of a RACH, dispose many parts of random access channel resources.

It is a kind of Typical Disposition that UpPTS comprises two SCFDMA symbols, at this moment, both can be in UpPTS the arbitrary access front signal offormat 4 in the transmission table 1, also can be in UpPTS transmitting SRS.Suppose to have disposed in the UpPTS one or more RACH resource, in order to guarantee the resource quadrature of RACH and SRS, SRS can only transmit in remaining frequency resource.This patent has proposed the collocation method of RACH, and it had both guaranteed the demand of arbitrary accessfront signal format 4, again transmitting SRS effectively.

Summary of the invention

The purpose of this invention is to provide a kind of in wireless communication system the equipment and the method for transmitting random access preamble signal.

According to an aspect of of the present present invention, a kind of method that disposes RACH comprises the steps:

A) the RACH resource of current configuration is indicated in the base station in broadcast channel;

B) subscriber equipment receives the base station to the RACH configuration information of resource, selects its RACH resources that take in continuous a plurality of RACH resources of an end that is arranged in band system band, and generates arbitrary access front signal, is then multiplexed on the RACH resource of its selection to send;

C) arbitrary access front signal is extracted in the base station on continuous a plurality of RACH resources of an end that is positioned at band system band, and arbitrary access front signal is detected.

According to another aspect of the present invention, a kind of method that disposes RACH comprises the steps:

A) the RACH resource of current configuration is indicated in the base station in broadcast channel;

B) subscriber equipment receives the base station to the RACH configuration information of resource, selects its RACH resource that takies in a plurality of RACH resources at the two ends that are distributed in band system band, and generates arbitrary access front signal, is then multiplexed on the RACH resource of its selection to send;

C) arbitrary access front signal is extracted in the base station on a plurality of RACH resources at the two ends that are distributed in band system band, and arbitrary access front signal is detected.

According to another aspect of the present invention, a kind of method that disposes RACH comprises the steps:

A) the RACH resource that disposes in the UpPTS is indicated in the base station in broadcast channel;

B) subscriber equipment receives the base station to the RACH configuration information of resource, selects its RACH resource that takies in a plurality of RACH resources multiplexing with time division multiplexing mode, and generates arbitrary access front signal, is then multiplexed on the RACH resource of its selection to send;

C) arbitrary access front signal is extracted in the base station on a plurality of RACH resources multiplexing with time division multiplexing mode, and arbitrary access front signal is detected.

According to another aspect of the present invention, a kind of method that disposes RACH comprises the steps:

A) subscriber equipment sends arbitrary access front signal in UpPTS, and its CP length is greater than 0;

B) arbitrary access front signal is detected in the base station in UpPTS, and the starting position of its DFT window is no earlier than the starting position of first effective SCFDMA symbol of UpPTS.

Description of drawings

Fig. 1 is the frame structure of LTE TDD;

Fig. 2 is the arbitrary access front signal structure;

Fig. 3 is the frequency domain position of Random Access Channel;

Fig. 4 is the equipment that RACH and SRS are handled in the base station;

Fig. 5 is the equipment that subscriber equipment is handled RACH and SRS;

Fig. 6 is the equipment that time-multiplexed a plurality of RACH are detected in the base station;

Fig. 7 is the equipment that subscriber equipment sends time-multiplexed a plurality of RACH;

Fig. 8 is the method for configuration RACH and SRS;

Fig. 9 is the method for configuration RACH;

Figure 10 is the method that time division multiplexing disposes a plurality of RACH resources;

Figure 11 is the short RACH structure of band CP.

Embodiment

The present invention proposes the method for designing of Random Access Channel in the LTE TDD system, the method for designing of the arbitrary access front signal that especially in UpPTS, transmits.The arbitrary access front signal that following handle transmits in UpPTS abbreviates short RACH as.

To LTE TDD system, on a RACH timing position, may need to dispose a plurality of RACH resources.Here, a RACH resource is meant that frequency bandwidth is that R, time span are the running time-frequency resource of T, and in the LTE system, R equals 1.08MHz; T is the time period that targeting signal takies.To the short RACH that transmits in UpPTS, the number of the targeting signal that might single short RACH resource can carry is fewer.For example the definition physical layer need provide 64 targeting signals to layer two (layer 2) in LTE TDD, if the targeting signal number that each short RACH resource provides is less than 64, then physical layer need dispose the ability of supported 64 targeting signals of a plurality of short RACH resources ability.In addition, when the duty ratio of the Random Access Channel of system is big,, still need on a RACH timing position, dispose a plurality of RACH resources even each RACH resource can provide 64 targeting signals.

The present invention describes below the method for 3 kinds of allocating random access channels.

The collocation method of RACH and SRS

Similar with the discussion in the LTE FDD system, for fear of the single-carrier property of destroying PUSCH, the RACH resource of LTETDD system also is to distribute at the two ends of band system band.Specifically can be divided into two kinds of situations, first kind of situation is that the band system band two ends have disposed PUCCH, and at this moment, two place's alternate location of RACH resource are the frequency resources of next-door neighbour PUCCH; The two ends that second kind of situation is band system band do not dispose PUCCH, and at this moment, two place's alternate location of RACH resource are the borders in band system band.

The method of distributing the RACH resource on the RACH timing position is described below.

First method is on a RACH timing position, a plurality of RACH resources is evenly distributed to as much as possible on the RACH alternative resource at band system band two ends.The number of remembering the RACH resource that certain RACH timing position need distribute is N, then distributes respectively at the band system band two ends

WithIndividual RACH resource.Specifically, when N equals 1, on the RACH timing position, only distribute a RACH resource, and be positioned at an end of band system band; When N greater than 1 the time, on the RACH timing position, the RACH resource is evenly distributed to the band system band two ends as much as possible.This method goes for the form of all the 5 kinds of arbitrary access front signals in the table 1.Adopt this method, the RACH resource is evenly distributed to the two ends of frequency band, this helps adopting the distribution of the PUSCH of frequency hopping, and this is because the method that a kind of important frequency-hopping method is a mirror image, the RACH resource is evenly distributed to the frequency band two ends has reduced restriction to the PUSCH frequency hopping.When needs send arbitrary access front signal, subscriber equipment is according to the RACH resource pattern of the current configuration in base station, in a plurality of RACH resources at the two ends that are distributed in band system band, select its RACH resource that takies, and generate arbitrary access front signal, be then multiplexed into the RACH resource of its selection

Last transmission.According to the RACH resource pattern of the current configuration in base station, arbitrary access front signal is extracted in the base station on a plurality of RACH resources at the two ends that are distributed in band system band, and arbitrary access front signal is detected.

Second method is on a RACH timing position, at an end continuous dispensing N of band system band₁Individual RACH resource; And on next RACH timing position, at the other end continuous dispensing N of band system band₂Individual RACH resource.Here, need the number of the RACH resource of distributing to be respectively N on continuous two the RACH timing positions of note₁And N₂, and N₁And N₂More than or equal to 1.This method guarantees that on two continuous RACH timing positions the frequency domain of RACH resource is apart from maximization, thereby the raising subscriber equipment retransmits the probability of success of arbitrary access front signal.When needs send arbitrary access front signal, subscriber equipment is according to the RACH resource pattern of the current configuration in base station, continuous a plurality of RACH resources at an end that is arranged in band system band are selected its RACH resource that takies, and the generation arbitrary access front signal, be then multiplexed on the RACH resource of its selection and send.According to the RACH resource pattern of the current configuration in base station, arbitrary access front signal is extracted in the base station on continuous a plurality of RACH resources of an end that is positioned at band system band, and arbitrary access front signal is detected.

Above-mentioned second method goes for the form of all the 5 kinds of arbitrary access front signals in the table 1.For example, adopt above-mentioned second method to distribute the RACH resource in UpPTS, the present invention does not limit information transmitted on other frequencies beyond the frequency of RACH resource occupation, for example, can be upstream data, SRS, ascending control information etc.Here, suppose that the resource frequency in addition that the RACH in the UpPTS takies is used for transmitting SRS.Adopt above-mentioned second method, the surplus resources in the UpPTS constitutes continuous frequency sub-band, and the residue frequency sub-band in continuous two UpPTS that comprise RACH lays respectively at the two ends of band system band.Like this, when the frequency band of the RACH resource occupation half smaller or equal to band system band, the surplus resources in two UpPTS can cover the whole system bandwidth, thereby support the channel probe to all frequencies on the system bandwidth.On these surplus resources, can send arrowband SRS; And work as the half of the bandwidth of broadband SRS smaller or equal to system bandwidth, two interior residue sub-bands of UpPTS can be supported the broad-band channel of whole system bandwidth is detected.In addition, when the frequency band of the RACH resource occupation half greater than band system band, above-mentioned second method support is carried out channel probe to frequency as much as possible on the system bandwidth.The base station sends configuration information to SRS to subscriber equipment, and subscriber equipment then sends SRS according to the configuration information that the base station sends on certain frequency that remains sub-band.

To above-mentioned first method, when the number of the RACH resource that needs on the RACH timing position to distribute greater than 2 the time, at least the end in band system band needs a plurality of RACH resources of continuous dispensing, to above-mentioned second method, when the number of the RACH resource that needs on the RACH timing position to distribute greater than 1 the time, need a plurality of RACH resources of continuous dispensing at an end of band system band.Usually, the method of continuous dispensing RACH resource is the adjacent Resource Block (RB) that makes adjacent RACH resource occupation, remember R RB of each RACH resource occupation, and certain RACH resource occupation a k～k+R-1 RB, then its adjacent RACH resource occupation the k-R～k-1 RB or the k+R～k+2R-1 RB.Reduce the phase mutual interference between the RACH resource if desired, the above-mentioned a plurality of RACH resources of an end continuous dispensing in band system band can expand to distributes a plurality of RACH resources and adjacent m RB in RACH resource interval, and m is more than or equal to 0 here.M equals 0 method corresponding to the continuous dispensing of general meaning.Remember certain RACH resource occupation the k～k+R-1 RB, then its adjacent RACH resource occupation the k-R-m～k-1-m RB or the k+R+m～k+2R-1+m RB.

The RACH resource of current configuration can be indicated in the base station in broadcast channel.System can some RACH resources of predefine the configuration pattern, then these configuration patterns are carried out index, thereby in broadcast channel, only need to send this index value.

Fig. 4 is the equipment that RACH and SRS are handled in the base station, and at first the broadcast message (401) of base station generation configuration RACH and multiplexing through physical channel multiplexer (403) together to the configuration information (402) of SRS sends by transmission/receiving system (404); Then, the base station receives through transmission/receiving system (404), and according to method of the present invention, carry out demultiplexing at physical channel demodulation multiplexer (405), RACH resource pattern according to the current configuration in base station, arbitrary access front signal is extracted in the base station on continuous a plurality of RACH resources of an end that is positioned at band system band, and detects at 406 pairs of arbitrary access front signals of module; When the base station disposed the SRS transmission on the frequency beyond the RACH resource, the SRS signal was extracted in the base station on other frequencies beyond the RACH resource, and detected at 407 couples of SRS of module.

Fig. 5 is the equipment that subscriber equipment is handled RACH and SRS, and at first subscriber equipment is through transmissions/receiving system (504) reception, obtains the broadcast message (501) of base station configuration RACH and to the configuration information (502) of its SRS at physical channel demodulation multiplexer (503); Then, RACH resource pattern according to the current configuration in base station, when needs send arbitrary access front signal, subscriber equipment is selected its RACH resource that takies in continuous a plurality of RACH resources of an end that is arranged in band system band, and atmodule 506 generation arbitrary access front signals, be multiplexed into through physical channel multiplexer (505) on the RACH resource of its selection, and send by transmission/receiving system (504); When the base station disposed its transmitting SRS on the frequency beyond the RACH resource, subscriber equipment generated SRS inmodule 507, was multiplexed on the frequency of base station configuration through physical channel multiplexer (505), and sent by transmission/receiving system (504).

The method of a plurality of RACH resources of configuration among the UpPTS

To LTE TDD system, under some configuring condition, its UpPTS comprises more than 2 SCFDMA symbols, and for example in order to keep the follow-up compatibility with TD-SCDMA, the symbolic number of UpPTS can value 2,6,7 and 11.Andtargeting signal format 4 as shown in Table 1, its time length is 5120 * T_s, it is equivalent to the length of 2.5 SCFDMA symbols.Suppose to have sent in the UpPTS short RACH, then on the sub-band at RACH place, short RACH only takies a part of SCFDMA symbol.Comprising 6 symbols with UpPTS is example, can remain 3 or 4 SCFDMA symbols on the sub-band at RACH place, how to use these remaining running time-frequency resources, the present invention proposes following method.

When needing to dispose a plurality of RACH resources in UpPTS, and the symbolic number of UpPTS is when many, and the present invention proposes with time-multiplexed mode multiplexing a plurality of RACH resources on UpPTS.Whether the present invention does not limit and allows the base station that the shared scheduling of resource of RACH is carried out transmitting uplink data to subscriber equipment.Here, when needs guarantee RACH resource and other resources (SRS, upstream data etc.) quadrature, have only the residue SCFDMA symbol of RACH place sub-band can be used to transmit other information (SRS, upstream data etc.).The time span of the short RACH of note is T, for example.The time span of thetargeting signal format 4 among the LTE TDD shown in the table 1 is 5120 * T_s, it is not the length of an integer up symbol.First kind is distributed the method for RACH resource in UpPTS be on the sub-band at RACH place, a plurality of RACH resources of continuous dispensing, and the initial sampling of a promptly back RACH resource is the next one sampling of the end sampling of previous RACH resource.For example, each RACH resource is from UpPTS end position continuous dispensing forward; Perhaps, each RACH resource from the UpPTS starting position continuous dispensing backward; Perhaps, RACH resource is distributed forward from the end position of second SCFDMA symbol of UpPTS, and other RACH resources begin continuous dispensing backward from the next one sampling of the end sampling of second SCFDMA symbol of UpPTS.Second kind of method of distributing the RACH resource in UpPTS is that to make each RACH resource be consistent with respect to the border of its SCFDMA symbol that takies.For example, each RACH signal is that end position T pre-set time from its last SCFDMA symbol that takies begins to send; Perhaps, each RACH signal is to begin from its first SCFDMA sign-on position that takies to send.

Method of the present invention can with unite use based on the method for the multiplexing a plurality of RACH resources of the method for frequency division multiplexing, at this moment distribute the RACH resource on a plurality of sub-bands of UpPTS, and distribute one or more RACH resource on each sub-band.

The RACH resource of current configuration can be indicated in the base station in broadcast channel.System can some RACH resources of predefine the configuration pattern, then these configuration patterns are carried out index, thereby in broadcast channel, only need to send this index value.

Fig. 6 is the equipment that time-multiplexed a plurality of RACH resources are detected in the base station, and at first the base station generates the broadcast message (601) of configuration RACH, and multiplexing through physical channel multiplexer (602), sends by transmission/receiving system (603); Then, the base station receives through transmission/receiving system (603), and according to method of the present invention, carry out demultiplexing at physical channel demodulation multiplexer (604), RACH resource pattern according to the current configuration in base station, arbitrary access front signal is extracted in the base station on a plurality of RACH resources multiplexing with time division multiplexing mode, and detects at 605 pairs of arbitrary access front signals of module.

Fig. 7 is the equipment that subscriber equipment sends time-multiplexed a plurality of RACH resources, and at first subscriber equipment receives by transmission/receiving system (703), obtains the broadcast message (701) of base station configuration RACH through physical channel demodulation multiplexer (702); Then, RACH resource pattern according to the current configuration in base station, when needs send arbitrary access front signal, subscriber equipment is selected its RACH resource that takies in a plurality of RACH resources multiplexing with time division multiplexing mode, and atmodule 705 generation arbitrary access front signals, be multiplexed into through physical channel multiplexer (704) on the RACH resource of its selection, and send by transmission/receiving system (703).

A kind of RACH structure of adding CP

The length of the CP of the arbitrary accessfront signal format 4 shown in the table 1 is 0, handles in order to support frequency domain, and the method that the base station receives arbitrary access front signal is based on overlap-add (overlap ﹠amp; Add) method.Typical Disposition for a UpPTS, when UpPTS comprises 2 SCFDMA symbols, with the frame structure that disposes general CP is example, supposes that symbol in 1ms time period that three special domain of TDD system constitute divides identically with other subframes with the setting of CP length, and then the time span of UpPTS is 4384 * T_s, and the targetingsignal format 4 is to shift to an earlier date 5120 * T from the UpPTS end position_sBegin to send, so the RACH signal of targetingsignal format 4 has taken a part of time that belongs to GP.Like this, when adopting the targetingsignal format 4 to send the RACH signal, the RACH signal is received the interference of the downstream signal of adjacent base station easily.Specifically, because the position of first symbol of the beginning timing ratio UpPTS of RACH in advance, before other signals that transmit on the frequency beyond the RACH of UpPTS were subjected to the interference of adjacent base station, the RACH signal may be disturbed.

The present invention proposes a kind of method that disposes short RACH, can solve top interference problem.Concrete solution is for the RACH signal adds CP, i.e. targetingsignal form 0 ~ 3 similar structure in employing and the table 1.For the interference free performance that makes the RACH signal is not weaker than other signals that transmit on the RACH frequency in addition of UpPTS, the present invention proposes the base station and detects the starting position that the starting position of the DFT window of arbitrary access front signal is no earlier than first effective SCFDMA symbol of UpPTS.The starting position of effective SCFDMA symbol here is not calculate the timing of CP in first sampling of interior SCFDMA symbol.The CP length of first symbol of note UpPTS is C * T_s, then the starting position of the DFT window of base station detection arbitrary access front signal regularly postpones C * T at least than the beginning of UpPTS_sWith LTE TDD system is example, and suppose that symbol in 1ms time period that three special domain constitute is divided and CP length be provided with identical with other subframes, the subframe structure of the present LTE TDD of basis then, when UpPTS comprised 7 symbols, C equaled 160; When the number of symbols of UpPTS was not equal to 7, C equaled 144.

The factors such as sub-district covering that the time span of the ordered sequence of RACH signal and the time span of CP can be supported are as required determined.When needs kept the design parameter of targetingsignal format 4 as far as possible, as shown in table 2, a kind of collocation method was that the time span of the ordered sequence of RACH signal is T_p=4096 * T_sThereby, equate with the sequence length of the RACH signal of targetingsignal format 4; Suppose that RACH structure of the present invention is to shift to an earlier date T from the UpPTS end position to begin to send, for example identical with the RACH signal of targetingsignal format 4, configuration T=5120 * T_s, and the starting position that the DFT window of arbitrary access front signal is detected in the base station is the starting position of first effective SCFDMA symbol of UpPTS, the CP length of RACH signal then of the present invention is T_CP=T-T_p-t_Cp, t here_CpBe the CP length of last symbol of UpPTS, to the frame structure of general CP, t_Cp=144 * T_sThen the length of CP is 880 * T_s

Table 2: a kind of targeting signal form that adds CP

The targeting signal form	TCP	TSEQ
			X (only being used for frame structure type 2)	880×Ts	4096×Ts

Adopt this method, the RACH targeting signal may still can take the time of a part of GP, does not need to utilize signal during this period of time when still detecting arbitrary access front signal because of the base station, so improved the performance of anti-adjacent base station interference.Adopt this method, when the starting position of detecting the DFT window of arbitrary access front signal when the base station was the starting position of first effective SCFDMA symbol of UpPTS, before other signals of UpPTS transmission were interfered, the RACH signal can be not disturbed; When the starting position of detecting the DFT window of arbitrary access front signal when the base station was later than the starting position of first effective SCFDMA symbol of UpPTS, after other signals of UpPTS transmission were subjected to a certain degree interference, the RACH signal just began disturbed.

Embodiment

This part has provided four embodiment of this invention, and is too tediously long for fear of the description that makes this patent, in the following description, omitted the detailed description of function that the public is known or device etc.

First embodiment

Present embodiment is described the present invention disposes a plurality of RACH resources and SRS in UpPTS a example.Here the system with bandwidth 5MHz is an example, and supposes that UpPTS comprises two SCFDMA symbols, and does not send PUCCH.Here suppose to transmit two RACH resources in the mode of frequency division multiplexing in each UpPTS, and the surplus resources of UpPTS is used for transmitting SRS.Because the Resource Block of 5MHz system (RB) number is 25, and the bandwidth of RACH resource is 6 RB, so except that the resource that RACH takies, the resource of 13 RB of residue in the UpPTS.

As shown in Figure 8, in first UpPTS, begin two RACH resources of continuous dispensing from the upper end of band system band, it has taken 12 RB; The resource of remaining 13 RB is used for transmitting SRS in the system bandwidth.In second UpPTS, begin two RACH resources of continuous dispensing from the lower end of band system band, it has taken 12 RB; The resource of remaining 13 RB is used for transmitting SRS in the system bandwidth.As shown in Figure 8, two interior RACH resources of UpPTS lay respectively at the two ends of band system band, have good frequency diversity effect, two interior SRS of UpPTS have covered the whole system frequency band simultaneously, so support the channel status on the whole system frequency band is measured.Specifically, this structure can support to send arrowband SRS, and for example the SRS bandwidth is the bandwidth of 4 or 6 RB; This structure also can support to send arrowband SRS, and for example the SRS bandwidth is about half of system bandwidth, i.e. the bandwidth of 12 or 13 RB.

Second embodiment

Present embodiment is described the present invention disposes the RACH resource of a plurality of targetingsignal forms 0 in LTE TDD system method.Here suppose in subframe 2 (perhaps subframe 5), to distribute the RACH channel, and sent PUCCH in this subframe simultaneously.Further hypothesis will be transmitted two RACH resources a subframe domestic demand.Time span by expansion RACH resource arrives a plurality of subframes, and present embodiment is equally applicable to the RACH resource of configuringpreamble signal format 1 ~ 3.

As shown in Figure 9, one or more RB at band system band two ends is used to transmit PUCCH, and two RACH resources lay respectively at the two ends of band system band, and takies the RB adjacent with PUCCH.Suppose that PUCCH takies k RB, system bandwidth is N RB, and since 0 index, then the k～k+5 RB is used to transmit a RACH resource to RB; The N-k-6～N-k-1 RB is used to transmit another RACH resource.Adopt this method, two RACH resources are mirrors with respect to the center of system bandwidth, distribute the PUSCH that adopts frequency hopping so do not influence according to the method for mirror image.

The 3rd embodiment

Present embodiment is described the present invention disposes a plurality of RACH resources in UpPTS with time-multiplexed method a example.Here suppose to comprise in theUpPTS 6 SCFDMA symbols, correspondingly, can two RACH resources of time division multiplexing in UpPTS.The time span of remembering each RACH resource occupation is T, is T=5120 * T as the time span of the RACH resource occupation of the targetingsignal format 4 in the table 1_sBe the schematic diagram of time division multiplexing RACH resource as shown in figure 10.For outstanding time-multiplexed method to the RACH resource, Figure 10 does not show that the RACH in the UpPTS takies the operating position of sub-band other frequency bands in addition.

In example one, two RACH resources begin continuous dispensing from the UpPTS end position, and promptlyRACH#1 shifts to an earlier date T from the UpPTS end position to begin to send;RACH#0 shifts to an earlier date 2T from the UpPTS end position to begin to send.Here, first SCFDMA symbol of UpPTS is not taken by RACH, can be used for transmitting SRS or upstream data etc.

In example two, two RACH resources are from UpPTS starting position continuous dispensing, and promptlyRACH#0 is that starting position from UpPTS begins to send;RACH#1 delays T to begin to send from the starting position of UpPTS.Here, last SCFDMA symbol of UpPTS is not taken by RACH, can be used for transmitting SRS or upstream data etc.

In example three, two RACH resources all are that the end position from the SCFDMA symbol begins to distribute, and promptlyRACH#0 is that end position from second SCFDMA symbol of UpPTS shifts to an earlier date T and begins to send;RACH#1 is that the end position from the 5th the SCFDMA symbol of UpPTS shifts to an earlier date T and begins to send.Here, last SCFDMA symbol of UpPTS is not taken by RACH, can be used for transmitting SRS or upstream data etc.

In example four, two RACH resources are continuous dispensing, and promptlyRACH#0 is that end position from second SCFDMA symbol of UpPTS shifts to an earlier date T and begins to send;RACH#1 is that the next sample position from second SCFDMA symbol of UpPTS begins to send.Here, last SCFDMA symbol of UpPTS is not taken by RACH, can be used for transmitting SRS or upstream data etc.

In example five, two RACH resources all are that the end position from the SCFDMA symbol begins to distribute, and promptlyRACH#0 is that end position from the 3rd the SCFDMA symbol of UpPTS shifts to an earlier date T and begins to send;RACH#1 is that the end position from the 6th the SCFDMA symbol of UpPTS shifts to an earlier date T and begins to send.

The 4th embodiment

Present embodiment is described the example of the short RACH of interpolation CP of the present invention.Here suppose to comprise in theUpPTS 2 SCFDMA symbols, and new short RACH structure being the same with the targetingsignal format 4, also is from the end position of UpPTS 5120 * T in advance_sBegin to send.

Be the configuration schematic diagram of the targeting signal of interpolation CP of the present invention as shown in figure 11.Adopt the parameter of the targeting signal shown in the table 2, the time span of the sequence of RACH signal is 4096 * T_s, CP length is 880 * T_sThe starting position that the DFT window of arbitrary access front signal is detected in the base station is the starting position of first effective SCFDMA symbol of UpPTS.Adopt this method, the RACH targeting signal still can take the time of a part of GP, does not need to utilize signal during this period of time when still detecting arbitrary access front signal because of the base station, so improved the performance of anti-adjacent base station interference.Before other signals of UpPTS transmission were interfered, the RACH signal can be not disturbed.Adopt this collocation method, first SCFDMA symbol that the RACH signal might interfering subframe 2 (perhaps subframe 6), but this interference is very little.

Claims (10)

Translated fromChinese

1.一种配置RACH的方法，包括如下步骤：1. A method for configuring RACH, comprising the steps of:a)基站在广播信道中指示当前配置的RACH资源；a) The base station indicates the currently configured RACH resource in the broadcast channel;b)用户设备接收基站对RACH资源的配置信息，在位于系统频带的一端的连续多个RACH资源中选择其占用的RACH资源，并生成随机接入前导信号，然后复用到其选择的RACH资源上发送；b) The user equipment receives the configuration information of the RACH resource from the base station, selects the RACH resource occupied by it from a plurality of consecutive RACH resources located at one end of the system frequency band, generates a random access preamble signal, and then multiplexes it to the RACH resource it selects send on;c)基站在位于系统频带的一端的连续多个RACH资源上提取随机接入前导信号，并对随机接入前导信号进行检测。c) The base station extracts random access preamble signals from multiple consecutive RACH resources located at one end of the system frequency band, and detects the random access preamble signals.2.根据权利要求1所述的方法，其特征在于，在一个RACH定时位置上，在系统频带的一端连续分配N₁个RACH资源，并在下一个RACH定时位置上，在系统频带的另一端连续分配N₂个RACH资源，这里，记连续的两个RACH定时位置上需要分配的RACH资源的个数分别为N₁和N₂。2. The method according to claim 1, wherein at one RACH timing position, N₁ RACH resources are allocated continuously at one end of the system frequency band, and at the next RACH timing position, at the other end of the system frequency band. N₂ RACH resources are allocated, and here, the numbers of RACH resources to be allocated at two consecutive RACH timing positions are recorded as N₁ and N₂ respectively.3.根据权利要求1所述的方法，其特征在于，UpPTS内的RACH占用的资源以外的频率用于传输SRS。3. The method according to claim 1, wherein frequencies other than the resources occupied by the RACH in the UpPTS are used to transmit the SRS.4.根据权利要求1所述的方法，其特征在于在步骤a)中，预定义RACH资源的配置图样，并在广播信道中需要发送配置图样的索引值。4. The method according to claim 1, characterized in that in step a), the configuration pattern of RACH resources is predefined, and the index value of the configuration pattern needs to be sent in the broadcast channel.5.一种配置RACH的方法，包括如下步骤：5. A method for configuring RACH, comprising the steps of:a)基站在广播信道中指示当前配置的RACH资源；a) The base station indicates the currently configured RACH resource in the broadcast channel;b)用户设备接收基站对RACH资源的配置信息，在分布在系统频带的两端的多个RACH资源中选择其占用的RACH资源，并生成随机接入前导信号，然后复用到其选择的RACH资源上发送；b) The user equipment receives the configuration information of the RACH resource from the base station, selects the RACH resource occupied by it from the multiple RACH resources distributed at both ends of the system frequency band, generates a random access preamble signal, and then multiplexes it to the RACH resource it selects send on;c)基站在分布在系统频带的两端的多个RACH资源上提取随机接入前导信号，并对随机接入前导信号进行检测。c) The base station extracts random access preamble signals from multiple RACH resources distributed at both ends of the system frequency band, and detects the random access preamble signals.6.根据权利要求5所述的方法，其特征在于，在一个RACH定时位置上，多个RACH资源尽可能地均匀分布到系统频带两端。6. The method according to claim 5, wherein at one RACH timing position, multiple RACH resources are evenly distributed to both ends of the system frequency band as much as possible.7.一种配置RACH的方法，包括如下步骤：7. A method for configuring RACH, comprising the steps of:a)基站在广播信道中指示UpPTS内配置的RACH资源；a) The base station indicates the RACH resources configured in the UpPTS in the broadcast channel;b)用户设备接收基站对RACH资源的配置信息，在以时分复用方式复用的多个RACH资源中选择其占用的RACH资源，并生成随机接入前导信号，然后复用到其选择的RACH资源上发送；b) The user equipment receives the configuration information of the RACH resource from the base station, selects the RACH resource occupied by it from the multiple RACH resources multiplexed in a time-division multiplexing manner, and generates a random access preamble signal, and then multiplexes it to the RACH resource it selects send on resource;c)基站在以时分复用方式复用的多个RACH资源上提取随机接入前导信号，并对随机接入前导信号进行检测。c) The base station extracts a random access preamble signal from multiple RACH resources multiplexed in a time division multiplexing manner, and detects the random access preamble signal.8.根据权利要求7所述的方法，其特征在于，在RACH所在的子频带上，连续分配多个RACH资源.8. The method according to claim 7, characterized in that, on the sub-band where the RACH is located, a plurality of RACH resources are allocated continuously.9.根据权利要求7所述的方法，其特征在于，使各个RACH资源相对于其占用的SCFDMA符号的边界是一致的。9. The method according to claim 7, characterized in that the boundary of each RACH resource relative to the occupied SCFDMA symbol is consistent.10.一种配置RACH的方法，包括如下步骤：10. A method for configuring RACH, comprising the steps of:a)用户设备在UpPTS内发送随机接入前导信号，其CP长度大于0；a) The user equipment sends a random access preamble in the UpPTS, and its CP length is greater than 0;b)基站在UpPTS内检测随机接入前导信号，其DFT窗口的开始位置不早于UpPTS的第一个有效SCFDMA符号的开始位置。b) The base station detects the random access preamble signal in the UpPTS, and the start position of the DFT window is not earlier than the start position of the first valid SCFDMA symbol of the UpPTS.

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