CN101355412B

Movatterモバイル変換

Info

Publication number: CN101355412B
Application number: CN 200810135522
Authority: CN
Inventors: 梁春丽; 夏树强; 戴博; 郝鹏
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2008-08-19
Filing date: 2008-08-19
Publication date: 2013-07-03
Anticipated expiration: 2028-08-19
Also published as: CN101355412A

Abstract

The invention discloses a method for transmitting a signal, comprising the following steps: a plurality of antenna terminals are divided into three groups, each group comprises a plurality of antenna terminals; the first group of the antenna terminals and the second group of the antenna terminals have the same number of the antenna terminals; reference signals of the plurality of antenna terminals in the third group of the antenna terminals are loaded in the same symbol to be transmitted. Through the method, the transmission for eight antenna reference signals can be realized, thereby improving the whole performance of a system.

Description

Signal transmitting method

Technical Field

The present invention relates to the field of communications, and in particular, to a signal transmission method.

Background

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation communication technology, which is one of the core technologies of fourth generation mobile communication. In order to overcome the fading, the channel is divided into a plurality of sub-channels in the frequency domain, the frequency spectrum characteristic of each sub-channel is approximately flat, and the sub-channels of the OFDM are orthogonal to each other, allowing the frequency spectrums of the sub-channels to overlap each other, and the frequency spectrum resources can be utilized to a great extent.

The Multiple-Input Multiple-output (MIMO) technology can increase system capacity, improve transmission performance, and can be well integrated with other physical layer technologies, becoming a key technology of the next Generation (Beyond3-Generation, abbreviated as B3G) and the fourth Generation mobile communication technology (4rd Generation, abbreviated as 4G). However, when the channel correlation is strong, the diversity gain and the multiplexing gain due to the multipath channel are greatly reduced, which causes a large decrease in the performance of the MIMO system. At present, a new MIMO precoding method is proposed, which is an efficient MIMO multiplexing method, and divides an MIMO channel into a plurality of independent virtual channels through precoding processing at a transmitting end and a receiving end, so that the influence of channel correlation can be effectively eliminated, and the stable performance of an MIMO system under various environments is ensured.

A Long Term Evolution (Long Term Evolution, LTE for short) system is an important project of the third generation partnership organization, and fig. 1 illustrates a structural diagram of a basic frame structure of the LTE system, and as shown in fig. 1, the frame structure is divided into four levels of radio frames, half frames, subframes, slots and symbols, wherein a length of one radio frame is 10ms, each radio frame is composed of two half frames, each half frame is 5ms, each half frame is composed of 5 subframes, each subframe is 1ms, one subframe is composed of two slots (slot #0 and slot #1), and a length of each slot is 0.5 ms.

When the LTE system employs a conventional cyclic prefix, a slot includes 7 uplink/downlink symbols (symbol number l ═ 0, 1, 2,. 6) with a length of 66.7us, wherein the cyclic prefix length of the first symbol is 5.21us, and the cyclic prefix lengths of the remaining 6 symbols are 4.69 us.

When the LTE system employs an extended cyclic prefix, one slot contains 6 uplink/downlink symbols (symbol number l ═ 0, 1, 2,. 5) with a length of 66.7us, where each symbol has a cyclic prefix length of 16.67 us.

Fig. 2 shows a schematic diagram of a Resource block structure when the bandwidth of an LTE system is 5MHz, and as shown in fig. 2, one Resource Element (RE for short) is one subcarrier in one OFDM symbol, and one downlink Resource block is composed of 12 continuous subcarriers in a frequency domain and is composed of 7 (in a conventional cyclic prefix structure) or 6 (in an extended cyclic prefix structure) OFDM symbols in a time domain, that is, one downlink Resource block occupies 180kHz in the frequency domain and is the time length of one general slot in the time domain, and when Resource allocation is performed, Resource blocks are allocated as a basic unit.

In an OFDM system, a MIMO technology is adopted, a base station can support application of at most 8 antennas, and accordingly, a reference signal also needs to support a scenario of 8 antennas, and in order to better apply the MIMO technology, the reference signal used for spatial channel estimation needs to be redesigned.

Disclosure of Invention

The present invention has been made in view of the problem that the prior art has no specific solution to the problem of the transmission method of the 8-antenna reference signal in the related art, and for this reason, the main object of the present invention is to provide a signal transmission method to solve the above problem.

According to an aspect of the present invention, a signal transmission method is provided.

The signal transmission method according to the present invention includes: dividing a plurality of antenna ports into 3 groups, wherein each group comprises a plurality of antenna ports, and the number of the antenna ports in the first antenna port group is the same as that of the antenna ports in the second antenna port group; and carrying the reference signals of the plurality of antenna ports in the third antenna port group in the same symbol and transmitting.

The operation of loading the reference signals of the multiple antenna ports in the third antenna port group in the same symbol is specifically as follows: for a subframe adopting a conventional cyclic prefix, carrying reference signals of a plurality of antenna ports in a third antenna port group on symbols numbered 2 and/or 5 in each time slot; for a subframe employing an extended cyclic prefix, reference signals for a plurality of antenna ports in the third antenna port group are carried on symbols numbered 2 and/or 4 per slot.

The operation of loading the reference signals of the multiple antenna ports in the first antenna port group in the same symbol is specifically as follows: for a subframe adopting a conventional cyclic prefix, bearing reference signals of a plurality of antenna ports in a first antenna port group on symbols with the number of each time slot being 0 and 4; for a subframe employing an extended cyclic prefix, reference signals for a plurality of antenna ports in the first antenna port group are carried on symbols numbered 0 and 3 per slot.

Wherein the loading the reference signals of the plurality of antenna ports in the second antenna port group in the same symbol includes: the reference signals for the plurality of antenna ports in the second antenna port group are carried on symbols numbered 1 per slot.

Specifically, for a subframe using a conventional cyclic prefix, the number of symbols of each slot is 0, 1, 2, 3, 4, 5, and 6 in sequence; for a subframe with an extended cyclic prefix, the symbols of each slot are numbered 0, 1, 2, 3, 4, 5 in sequence.

Preferably, the method further comprises: and determining the frequency domain initial position of the reference signal of each antenna port according to the cell identification.

Further, the method further comprises: setting the position of the reference signal corresponding to the first antenna port group and the position of the reference signal corresponding to the second antenna port group as cell-specific, and setting the position of the reference signal corresponding to the third antenna port group as user-specific; or setting the position of the reference signal corresponding to the first antenna port group, the position of the reference signal corresponding to the second antenna port group and the position of the reference signal corresponding to the third antenna port group as cell-specific.

The cell-specific means that each resource block of a symbol carries a reference signal of an antenna port; the user-specific means that a reference signal of an antenna port is carried on a time-frequency resource where a user physical downlink shared channel is located.

for each antenna port group, the operation of respectively carrying the reference signals of the antenna ports in the same symbol is specifically as follows: for the first antenna port group, under the condition of adopting a conventional cyclic prefix, carrying reference signals of 2 antenna ports on symbols with the number of 0 and 4 in each time slot; under the condition of adopting the extended cyclic prefix, bearing the reference signals of 2 antenna ports on the symbols with the serial numbers of 0 and 3 in each time slot; for the second antenna port group, carrying the reference signals of 2 antenna ports thereof on the symbol numbered 1 of each time slot; for the third antenna port group, under the condition of adopting the conventional cyclic prefix, carrying the reference signals of 4 antenna ports on the symbols with the number of each time slot being 2 and/or 5; in case of using extended cyclic prefix, the reference signals of its 4 antenna ports are carried on symbols numbered 2 and/or 4 per slot.

Preferably, for a subframe employing a normal cyclic prefix, the number of each slot symbol is 0, 1, 2, 3, 4, 5, 6; for a subframe with an extended cyclic prefix, the number of symbols of each slot is 0, 1, 2, 3, 4, 5.

Further, the method further comprises: and determining the frequency domain initial position of the reference signal of each antenna port according to the cell identification.

Preferably, the method further comprises: setting the position of the reference signal corresponding to the first antenna port group and the position of the reference signal corresponding to the second antenna port group as cell-specific, and setting the position of the reference signal corresponding to the third antenna port group as user-specific; or setting the position of the reference signal corresponding to the first antenna port group, the position of the reference signal corresponding to the second antenna port group and the position of the reference signal corresponding to the third antenna port group as cell-specific.

In addition, the method further comprises: cell-specific means that each resource block of a symbol carries a reference signal of an antenna port; the user-specific means that a reference signal of an antenna port is carried on a time-frequency resource where a user physical downlink shared channel is located.

Specifically, the process of dividing 8 antenna ports into 3 antenna port groups includes: setting antenna port numbers corresponding to 8 antenna ports as 0, 1, 2, 3, 4, 5, 6 and 7 respectively, wherein the first antenna port group comprises antenna ports with antenna port numbers of 0 and 1, the second antenna port group comprises antenna ports with antenna port numbers of 2 and 3, and the third antenna port group comprises antenna ports with antenna port numbers of 4, 5, 6 and 7; or, the antenna port numbers corresponding to the 8 antenna ports are set to be 0, 1, 2, 3, 6, 7, 8 and 9 respectively, wherein the first antenna port group includes the antenna ports with the antenna port numbers of 0 and 1, the second antenna port group includes the antenna ports with the antenna port numbers of 2 and 3, and the third antenna port group includes the antenna ports with the antenna port numbers of 6, 7, 8 and 9.

Through at least one technical scheme of the invention, the transmission of the 8-antenna reference signal can be realized, so that the overall performance of the system is improved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a structural diagram of a basic frame structure of an LTE system according to the related art;

fig. 2 is a schematic diagram of a resource block structure when a bandwidth of an LTE system is 5MHz according to the related art;

fig. 3 is a flow chart of a signal transmission method according to a first embodiment of the method of the present invention;

fig. 4 is a flow chart of a signaling method according to a second embodiment of the method of the invention;

FIG. 5(A) is a schematic diagram of example one of the methods shown in FIG. 4;

FIG. 5(B) is a schematic diagram of example one of the methods shown in FIG. 4;

FIG. 6(A) is a schematic diagram of example two of the method shown in FIG. 4;

FIG. 6(B) is a schematic diagram of example two of the method shown in FIG. 4;

FIG. 7(A) is a schematic diagram of example three of the method shown in FIG. 4;

FIG. 7(B) is a schematic diagram of example three of the method shown in FIG. 4;

FIG. 8(A) is a schematic diagram of example four of the method shown in FIG. 4;

fig. 8(B) is a schematic diagram of example four of the method shown in fig. 4.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

Method embodiment one

According to an embodiment of the present invention, a signal transmission method is provided.

Fig. 3 is a flowchart of a signal transmission method according to an embodiment of the present invention, as shown in fig. 3, the method including the steps of:

step S302, dividing a plurality of antenna ports into 3 groups, wherein each group comprises a plurality of antenna ports, the number of the antenna ports of the first antenna port group is the same as that of the antenna ports of the second antenna port group, and is different from that of the antenna ports of the third antenna port group, and the frequency domain initial position of the reference signal of each antenna port can be determined according to the cell identifier;

step S304, carrying the reference signals of a plurality of antenna ports in a third antenna port group in the same symbol and sending the reference signals, wherein the interval of the reference signals belonging to the same antenna port on the same symbol on the frequency domain is 12 subcarriers, the interval of the reference signals on different antenna ports on the frequency domain is 3 subcarriers, and the interval of the reference signals belonging to the same antenna port in adjacent symbols of the time domain on the frequency domain is 3 or 6 subcarriers;

before implementing the embodiment of the invention, the symbols of each time slot in the sub-frame need to be numbered, and for the sub-frame adopting the conventional cyclic prefix, the symbols of each time slot of the sub-frame are numbered 0, 1, 2, 3, 4, 5 and 6 in sequence; for a subframe employing an extended cyclic prefix, the symbols of each slot of the subframe are numbered 0, 1, 2, 3, 4, 5 in sequence.

The following describes the manner of setting the reference signals in the above three antenna port groups.

The method comprises the steps that reference signals of a plurality of antenna ports in a first antenna port group are all carried in the same symbol, the interval of the reference signals belonging to the same antenna port on the same symbol on a frequency domain is 12 subcarriers, the interval of the reference signals on different antenna ports on the same symbol on the frequency domain is 3 subcarriers, and the interval of the reference signals belonging to the same antenna port in adjacent symbols of a time domain on the frequency domain is 3 subcarriers;

the reference signals of a plurality of antenna ports in the second antenna port group are all carried in the same symbol, the interval of the reference signals belonging to the same antenna port on the same symbol on the frequency domain is 6 subcarriers, the interval of the reference signals on different antenna ports on the same symbol on the frequency domain is 3 subcarriers, and the interval of the reference signals belonging to the same antenna port in adjacent symbols of the time domain on the frequency domain is 3 subcarriers;

and bearing the reference signals of the multiple antenna ports in the third antenna port group in the same symbol, wherein the interval of the reference signals belonging to the same antenna port in the same symbol on the frequency domain is 12 subcarriers, the interval of the reference signals belonging to different antenna ports in the same symbol on the frequency domain is 3 subcarriers, and the interval of the reference signals belonging to the same antenna port in adjacent time domain symbols on the frequency domain is 3 subcarriers or 6 subcarriers.

For a first antenna port group, in the case of using a conventional cyclic prefix, reference signals of multiple antenna ports in the group may be carried on symbols numbered 0 and 4 in each timeslot; in the case of an extended cyclic prefix, the reference signals for the multiple antenna ports in the group may be carried on symbols numbered 0 and 3 per slot.

For the second antenna port group, the reference signals for the multiple antenna ports in the group may be carried on the symbol numbered 1 per slot.

For a third antenna port group, in case of employing a conventional cyclic prefix, reference signals of multiple antenna ports in the group may be carried on symbols numbered 2 and/or 5 per slot; in the case of an extended cyclic prefix, the reference signals for the multiple antenna ports in the group may be carried on symbols numbered 2 and/or 4 per slot.

In addition, the antenna port group may be respectively configured to be cell-specific or user-specific, where the cell-specific indicates that each resource block of the symbol carries a reference signal of the antenna port, and the user-specific indicates that the reference signal of the antenna port is only carried on a time-frequency resource where a user physical downlink shared channel is located, and each resource block of the symbol carries the reference signal of the antenna port, and specifically, the method may include the following two setting methods:

the first method is as follows: setting the position of the reference signal corresponding to the first antenna port group and the position of the reference signal corresponding to the second antenna port group as cell-specific, and setting the position of the reference signal corresponding to the third antenna port group as user-specific;

the second method comprises the following steps: and setting the position of the reference signal corresponding to the first antenna port group, the position of the reference signal corresponding to the second antenna port group and the position of the reference signal corresponding to the third antenna port group as cell-specific.

It should be noted that the frequency domain interval includes one end reference signal, for example, R₀And R₁The interval between the frequency domains is 3 subcarriers including R₀Or R₁In the inner space.

Method embodiment two

Fig. 4 is a flowchart of a signal transmission method according to an embodiment of the present invention, as shown in fig. 4, the method including the steps of:

step S402, dividing 8 antenna ports into 3 antenna port groups, wherein the first antenna port group comprises 2 antenna ports, the second antenna port group comprises 2 antenna ports, and the third antenna port group comprises 4 antenna ports;

step S404, for each antenna port group, respectively bearing the reference signal of the antenna port in the same symbol, wherein the frequency domain initial position of the reference signal of each antenna port can be determined according to the cell identifier;

step S406, for the first and second antenna port groups, the interval of the reference signal belonging to the same antenna port on the same symbol on the frequency domain is 6 subcarriers, the interval of the reference signal belonging to the same antenna port on the same symbol on the frequency domain is 3 subcarriers, and the interval of the reference signal belonging to the same antenna port in the adjacent symbols of the time domain on the frequency domain is 3 subcarriers; for the third antenna port group, the interval of the reference signals belonging to the same antenna port on the same symbol on the frequency domain is 12 subcarriers, the interval of the reference signals belonging to different antenna ports on the same symbol on the frequency domain is 3 subcarriers, and the interval of the reference signals belonging to the same antenna port in the adjacent symbols of the time domain on the frequency domain is 3 or 6 subcarriers;

by the technical scheme provided by the embodiment of the invention, the method for sending the reference signal of the 8-antenna port can be realized, so that the overall performance of the system is improved.

Before implementing the embodiment of the present invention, symbols of each slot in a subframe need to be numbered, and a specific numbering method thereof is the same as that in the first embodiment of the method, and is not described herein again.

For each antenna port group, the specific operation of respectively carrying the reference signals of the antenna ports in the same symbol is as follows: for the first antenna port group, in the case of adopting the conventional cyclic prefix, the reference signals of 2 antenna ports thereof may be carried on the symbols numbered 0 and 4 of each timeslot; in the case of using the extended cyclic prefix, reference signals of 2 antenna ports thereof may be carried on symbols numbered 0 and 3 per slot; for the second antenna port group, bearing the reference signals of 2 antenna ports on the symbol with the number of 1 in each time slot; for the third antenna port group, in case of adopting the conventional cyclic prefix, the reference signals of its 4 antenna ports may be carried on the symbols numbered 2 and/or 5 per timeslot; in case of using extended cyclic prefix, the reference signals of its 4 antenna ports can be carried on symbols numbered 2 and/or 4 per slot.

In addition, the antenna port group may be set to be cell-specific or user-specific, and the specific setting method is the same as the first method embodiment, which is not described herein again.

Moreover, the setting mode of the antenna port number may include the following two modes:

in a first mode, antenna port numbers corresponding to 8 antenna ports are respectively set to be 0, 1, 2, 3, 4, 5, 6 and 7, wherein a first antenna port group comprises antenna ports with antenna port numbers of 0 and 1, a second antenna port group comprises antenna ports with antenna port numbers of 2 and 3, and a third antenna port group comprises antenna ports with antenna port numbers of 4, 5, 6 and 7; or

Mode two, set up the antenna port number that 8 antenna ports correspond and be 0, 1, 2, 3, 6, 7, 8, 9 respectively, wherein, first antenna port group contains the antenna port number and is 0 and 1 antenna port, and second antenna port group contains the antenna port number and is 2 and 3 antenna port, and third antenna port group contains the antenna port number and is 6, 7, 8, 9 antenna port.

The following describes an embodiment of the present invention by taking a 3GPP LTE (5 MHz wide) system as an example, where the system includes 512 subcarriers, where the number of available subcarriers is 300 in the middle, and each resource block includes 12 consecutive subcarriers, and thus the 5M bandwidth system has 25 resource blocks in total.

The present invention is described with an example in which the total number of antenna ports is 8 antenna ports, where each antenna port corresponds to a reference signal, 8 antenna ports correspond to antenna ports with

numbers

0, 1, 2, 3, 4, 5, 6, and 7, respectively, where a first antenna port group includes antenna ports with

numbers

0 and 1, a second antenna port group includes antenna ports with

numbers

2 and 3, a third antenna port group includes antenna ports with

numbers

4, 5, 6, and 7, and reference signals of the 8 antenna ports are { R ″, respectively₀，R₁，R₂，R₃，R₄，R₅，R₆，R₇Will { R }₀，R₁，R₂，R₃，R₄，R₅，R₆，R₇Dividing the reference signals into 3 groups, wherein the number of the reference signals contained in each group is unequal, and R is divided into three groups₀And R₁Dividing into a first group, dividing R₂And R₃Dividing into a second group, dividing R₄、R₅、R₆And R₇And divided into a third group.

According to the above division method, each of the first antenna port groupsReference signals on the root antenna port are carried on the same symbol, the interval of the reference signals belonging to the same antenna port on the same symbol on a frequency domain is 6 subcarriers, and the frequency domain interval of adjacent reference signals of different adjacent antenna ports is 3 subcarriers; on the adjacent symbol of the time domain bearing the reference signal of the antenna port group, the interval of the reference signal belonging to the same antenna port on the frequency domain is 3 subcarriers; wherein, reference signals of 2 antenna ports are carried in one symbol, and R is R under the condition that the total number of the antenna ports is 8₀，R₁R carried in same symbol and adjacent to same symbol₀And R₁Is 3 subcarriers, adjacent R₀/R₁The interval of the frequency domain is 6 sub-carriers; time domain adjacent bearer R₀，R₁On the symbol of (A), R adjacent on different symbols₀/R₁The frequency domain interval between them is 3 subcarriers.

The reference signal of each antenna port in the second antenna port group is carried on the same symbol, the interval of the reference signal belonging to the same antenna port on the same symbol on the frequency domain is 6 subcarriers, and the frequency domain interval of the adjacent reference signal of the adjacent different antenna ports is 3 subcarriers; the interval of the reference signals belonging to the same antenna port on the adjacent symbols of the time domain bearing the reference signals of the antenna port group on the frequency domain is 3 subcarriers; wherein, reference signals of 2 antenna ports are carried in one symbol, and R is R under the condition that the total number of the antenna ports is 8₂，R₃Carried in the same symbol and on the same symbol, adjacent R₂And R₃Is 3 subcarriers, adjacent R₂/R₃The interval of the frequency domain is 6 sub-carriers; time domain adjacent bearer R₂，R₃On the symbol of (A), R adjacent on different symbols₂/R₃The frequency domain interval between them is 3 subcarriers.

The reference signals of each antenna port in the third antenna port group are carried on the same symbol, and the reference signals belonging to the same antenna port on the same symbol are in the frequency domainEvery 12 subcarriers, the frequency domain interval of the adjacent reference signals of the adjacent different antenna ports is 3 subcarriers; the interval of the reference signals belonging to the same antenna port on the adjacent symbols of the time domain bearing the reference signals of the antenna port group on the frequency domain is 3 or 6 sub-carriers; wherein, reference signals of 4 antenna ports are carried in one symbol, and R is R under the condition that the total number of the antenna ports is 8₄，R₅，R₆，R₇Carried in the same symbol and on the same symbol, adjacent R₄And R₅(or R)₅And R₆Or R is₆And R₇Or R is₄And R₇) Is 3 subcarriers, adjacent R₄/R₅/R₆/R₇The interval of the frequency domain is 12 sub-carriers; time domain adjacent bearer R₄，R₅，R₆，R₇On the symbol of (A), R adjacent on different symbols₄/R₅/R₆/R₇The frequency domain interval between them is 3 or 6 subcarriers.

Example one

Fig. 5(a) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs a normal cyclic prefix, and fig. 5(B) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs an extended cyclic prefix.

As shown in FIG. 5(A), reference signal { R) for the first antenna port group₀，R₁}：

R is to be₀Carrying on the kth subcarrier and the (k + 6) th subcarrier of each resource block of a symbol with each slot number of 0, wherein k is equal to {0, 1, 2, 3, 4, 5 };

r is to be₀Also carried on the (k + 3) th and mth subcarriers of each resource block of the symbol withslot number 4, where m ═ k +9) mod12, k is as above;

r is to be₁Each resource block carrying a symbol numbered 0 in each slotOn the (k + 3) th subcarrier and the (m) th subcarrier, where m is (k +9) mod12, k is as above;

r is to be₁The carrier is also carried on the kth subcarrier and the kth +6 subcarrier of each resource block of a symbol with the number of each time slot being 4, and k is the same as the above;

reference signal for the second antenna port group { R₂，R₃}：

R is to be₂Carried on the kth and k +6 subcarriers of each resource block ofslot #0 symbol numbered 1, where k ∈ {0, 1, 2, 3, 4, 5 };

r is to be₂Also carried on the k +3 th and mth subcarriers of each resource block ofslot #1 symbol numbered 1, where m ═ k +9) mod12, k is as above;

r is to be₃Carried on the (k + 3) th and mth subcarriers of each resource block ofslot #0 symbol numbered 1, where m ═ k +9) mod12, k being as above;

r is to be₃The carrier is also carried on the kth subcarrier and the kth +6 subcarrier of each resource block of the symbol with the number of 1 in thetime slot #1, and k is the same as the above;

reference signal for third antenna port set R₄，R₅，R₆，R₇}：

R is to be₄Carried on the kth subcarrier of each resource block ofslot #0 symbol numbered 2, where k ∈ {0, 1, 2, 3, 4, 5 };

r is to be₄Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 2, and k is the same as above;

r is to be₅The carrier is carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 2, and k is the same as the above;

r is to be₅The m-th resource block of each resource block also carrying the symbol numbered 2 in slot #1On subcarriers, where m ═ k +9) mod12, k is as above;

r is to be₆The carrier is carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 2, and k is the same as the above;

r is to be₆Is also carried on the kth subcarrier of each resource block of the symbol with the number of thetime slot #1 being 2, k is the same as above;

r is to be₇On the mth subcarrier of each resource block ofslot #0 symbol numbered 2, where m ═ k +9) mod12, k being as above;

r is to be₇And is also carried on the (k + 3) th subcarrier of each resource block of theslot #1 symbol numbered 2, k being as above.

As shown in FIG. 5(B), reference signal { R) for the first antenna port group₀，R₁}：

r is to be₀Is also carried on the (k + 3) th and mth subcarriers of each resource block of the symbol withslot number 3, where m ═ k +9) mod12, k is as above;

r is to be₁Is carried on the (k + 3) th subcarrier and the m-th subcarrier of each resource block with each slot number of 0 symbol, wherein m is (k +9) mod12, and k is the same as above;

r is to be₁The carrier is also carried on the kth subcarrier and the kth +6 subcarrier of each resource block of a symbol with the number of each time slot being 3, and k is the same as the above;

reference signal for the second antenna port group { R₂，R₃}：

R is to be₂Carried on the kth and k +6 th subcarriers of each resource block ofslot #0, symbol numbered 1, where k e {0, 1, 2, 3,4，5}；

reference signal for third antenna port set R₄，R₅，R₆，R₇}：

r is to be₄Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 2, k is the same as above;

r is to be₅Also carried on the mth subcarrier of each resource block ofslot #1 symbol numbered 2, where m ═ k +9) mod12, k is as above;

Example two

Fig. 6(a) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs a normal cyclic prefix, and fig. 6(B) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs an extended cyclic prefix.

As shown in fig. 6(a), in this embodiment, the position of the first antenna port group reference signal and the position of the second antenna port group reference signal in fig. 6(a) are the same as those in fig. 5(a), and are not described again here.

Reference signal for third antenna port set R₄，R₅，R₆，R₇}：

R is to be₄Carried on the kth subcarrier of each resource block ofslot #0 symbol numbered 5, where k ∈ {0, 1, 2, 3, 4, 5 };

r is to be₄Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 5, and k is the same as above;

r is to be₅The carrier is carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 5, and k is the same as the above;

r is to be₅Also carried on the mth subcarrier of each resource block ofslot #1 symbol numbered 5, where m ═ k +9) mod12, k is as above;

r is to be₆The carrier is carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 5, and k is the same as the above;

r is to be₆Is also carried on the kth sub-carrier of each resource block of the symbol with the number of 5 of thetime slot #1, k is the same as above;

r is to be₇Each carrying a symbol numbered 5 in slot #0On the mth subcarrier of the resource block, where m ═ k +9) mod12, k being as above;

r is to be₇And is also carried on the (k + 3) th subcarrier of each resource block of the symbol numbered 5 inslot #1, k being as above.

As shown in fig. 6(B), in this embodiment, the position of the first antenna port group reference signal and the position of the second antenna port group reference signal in fig. 6(B) are the same as those in fig. 5(B), and are not described again here.

Reference signal for third antenna port set R₄，R₅，R₆，R₇}：

R is to be₄Carried on the kth subcarrier of each resource block ofslot #0 symbol numbered 4, where k ∈ {0, 1, 2, 3, 4, 5 };

r is to be₄Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 4, and k is the same as above;

r is to be₅The carrier is carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of 4 of thetime slot #0, and k is the same as the above;

r is to be₅Also carried on the mth subcarrier of each resource block ofslot #1 symbol numbered 4, where m ═ k +9) mod12, k is as above;

r is to be₆The carrier is carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of 4 of thetime slot #0, and k is the same as the above;

r is to be₆Is also carried on the kth subcarrier of each resource block of the symbol with the number of 4 of thetime slot #1, k is the same as above;

r is to be₇Carried on the mth subcarrier of each resource block ofslot #0 symbol numbered 4, where m ═ k +9) mod12, k is as above;

r is to be₇And is also carried on the (k + 3) th subcarrier of each resource block of the symbol numbered 4 inslot #1, k being as above.

Example three

Fig. 7(a) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs a normal cyclic prefix, and fig. 7(B) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs an extended cyclic prefix.

As shown in fig. 7(a), in this embodiment, the position of the first antenna port group reference signal and the position of the second antenna port group reference signal in fig. 7(a) are the same as those in fig. 5(a), and are not described again here.

Reference signal for third antenna port set R₄，R₅，R₆，R₇}：

R is to be₄Carried on the kth subcarrier of each resource block of symbols with eachslot number 2, where k ∈ {0, 1, 2, 3, 4, 5 };

r is to be₄The carrier is also loaded on the (k + 6) th subcarrier of each resource block of the symbol with the number of each time slot being 5, and k is the same as the above;

r is to be₅The carrier is carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of each time slot being 2, and k is the same as the above;

r is to be₅Also carried on the m-th sub-carrier of each resource block of symbol withslot number 5, where m ═ k +9) mod12, k is as above;

r is to be₆The carrier is carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of each time slot being 2, and k is the same as the above;

r is to be₆The carrier is also carried on the kth subcarrier of each resource block of a symbol with the number of each time slot being 5, and k is the same as the k;

r is to be₇Carried on the m-th subcarrier of each resource block of symbol withslot number 2, where m ═ k +9) mod12, k is as above;

r is to be₇And is also carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of 5 in each slot, k being the same as above.

As shown in fig. 7(B), in this embodiment, the position of the first antenna port group reference signal and the position of the second antenna port group reference signal in fig. 7(B) are the same as those in fig. 5(B), and are not described again here.

Reference signal for third antenna port set R₄，R₅，R₆，R₇}：

r is to be₄The carrier is also carried on the (k + 6) th subcarrier of each resource block of a symbol with the number of each time slot being 4, and k is the same as the above;

r is to be₅Also carried on the m-th sub-carrier of each resource block of symbol withslot number 4, where m ═ k +9) mod12, k is as above;

r is to be₆The carrier is also carried on the kth subcarrier of each resource block of a symbol with the number of each time slot being 4, and k is the same as the k;

r is to be₇The carrier is also loaded on the (k + 3) th subcarrier of each resource block of a symbol with the number of each time slot being 4, and k is the same as the above;

example four

Fig. 8(a) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs a normal cyclic prefix, and fig. 8(B) is a schematic diagram of a location of a reference signal carrying 8 antenna ports in one resource block when the system employs an extended cyclic prefix.

As shown in fig. 8(a), in this embodiment, the position of the first antenna port group reference signal and the position of the second antenna port group reference signal in fig. 8(a) are the same as those in fig. 5(a), and are not described again here.

Reference signal for third antenna port set R₄，R₅，R₆，R₇}：

R is to be₄Carried on the kth subcarrier of each resource block of the symbol numbered 2 ofslot #0, where k ∈ {0, 1, 2, 3, 4, 5 };

r is to be₄Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 5, and k is the same as above;

r is to be₄Is also carried on the (k + 3) th subcarrier of each resource block of the symbol numbered 2 of theslot #1, k being as above;

r is to be₄Also carried on the mth subcarrier of each resource block ofslot #1 symbol numbered 5, where m ═ k +9) mod12, k is as above;

r is to be₅Also carried on the mth subcarrier of each resource block ofslot #0,symbol number 5, where m ═ k +9) mod12, k is as above;

r is to be₅Is also carried on the kth subcarrier of each resource block of the symbol with the number of thetime slot #1 being 2, k is the same as above;

r is to be₅Also carrying the k +6 th sub-carrier of each resource block of the symbol numbered 5 in slot #1On wave, k is as above;

r is to be₆Is also carried on the kth subcarrier of each resource block of the symbol with the number of 5 of thetime slot #0, k is the same as above;

r is to be₆Also carried on the mth subcarrier of each resource block ofslot #1 symbol numbered 2, where m ═ k +9) mod12, k is as above;

r is to be₆Is also carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 5, and k is the same as above;

r is to be₇Is also carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 5, and k is the same as above;

r is to be₇Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 2, and k is the same as above;

r is to be₇But also on the kth subcarrier of each resource block which also carries the symbol numbered 5 inslot #1, k being as above.

As shown in fig. 8(B), in this embodiment, the position of the first antenna port group reference signal and the position of the second antenna port group reference signal in fig. 8(B) are the same as those in fig. 5(B), and are not described again here.

Reference signal for third antenna port set R₄，R₅，R₆，R₇}：

r is to be₄Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 4, and k is the same as above;

r is to be₄Also carried on the mth subcarrier of each resource block ofslot #1 symbol numbered 4, where m ═ k +9) mod12, k is as above;

r is to be₅Also carried on the mth subcarrier of each resource block ofslot #0,symbol number 4, where m ═ k +9) mod12, k is as above;

r is to be₅Is also carried on the (k + 6) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 4, and k is the same as above;

r is to be₆Is also carried on the kth subcarrier of each resource block of the symbol with the number of 4 of thetime slot #0, k is the same as above;

r is to be₆Is also carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of thetime slot #1 being 4, and k is the same as the above;

r is to be₇Is also carried on the (k + 3) th subcarrier of each resource block of the symbol with the number of thetime slot #0 being 4, and k is the same as the above;

r is to be₇But also on the kth subcarrier of each resource block which also carries the symbol numbered 4 inslot #1, k being as above.

It should be noted that, in the above embodiments of the present invention, the frequency domain initial position of the reference signal is set to k equal to 0 as an example, but the present invention is not limited thereto, and the frequency domain initial position is the same as the processing method of k equal to 0 when the frequency domain initial position is other values, and is not described herein again, and the frequency domain initial position is still within the protection scope of the present invention when the frequency domain initial position is other values.

As described above, by the signal transmission method provided by the present invention, transmission of 8-antenna reference signals can be realized, thereby improving the overall performance of the system.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A signal transmission method, comprising:

dividing a plurality of antenna ports into 3 groups, wherein each group comprises a plurality of antenna ports, and the number of the antenna ports in the first antenna port group is the same as that of the antenna ports in the second antenna port group;

carrying the reference signals of a plurality of antenna ports in the third antenna port group in the same symbol and sending the reference signals;

wherein the method further comprises:

for a symbol carrying a reference signal of a first antenna port group, the interval of the reference signal belonging to the same antenna port in the same symbol in the frequency domain is 6 subcarriers, the interval of the reference signal belonging to different antenna ports in the same symbol in the frequency domain is 3 subcarriers, and the interval of the reference signal belonging to the same antenna port in adjacent time domain symbols in the frequency domain is 3 subcarriers;

for a symbol carrying a reference signal of a second antenna port group, the interval of the reference signal belonging to the same antenna port in the same symbol in the frequency domain is 6 subcarriers, the interval of the reference signal belonging to different antenna ports in the same symbol in the frequency domain is 3 subcarriers, and the interval of the reference signal belonging to the same antenna port in adjacent time domain symbols in the frequency domain is 3 subcarriers;

for the symbol carrying the reference signal of the third antenna port group, the interval of the reference signal belonging to the same antenna port in the same symbol in the frequency domain is 12 subcarriers, the interval of the reference signal belonging to different antenna ports in the same symbol in the frequency domain is 3 subcarriers, and the interval of the reference signal belonging to the same antenna port in the adjacent time domain symbol in the frequency domain is 3 subcarriers or 6 subcarriers.

2. The method of claim 1, wherein the carrying the reference signals of the antenna ports in the third antenna port group in the same symbol comprises:

for a subframe adopting a conventional cyclic prefix, carrying reference signals of a plurality of antenna ports in the third antenna port group on symbols numbered 2 and/or 5 in each time slot;

for a subframe adopting an extended cyclic prefix, bearing reference signals of a plurality of antenna ports in the third antenna port group on symbols numbered 2 and/or 4 in each time slot;

for the sub-frame adopting the conventional cyclic prefix, the number of the symbol of each time slot is 0, 1, 2, 3, 4, 5 and 6 in sequence;

for a subframe with an extended cyclic prefix, the symbols of each slot are numbered 0, 1, 2, 3, 4, 5 in sequence.

3. The method of claim 1, wherein carrying the reference signals of the plurality of antenna ports in the first antenna port group in the same symbol comprises:

for a subframe adopting a conventional cyclic prefix, carrying reference signals of a plurality of antenna ports in the first antenna port group on symbols with the number of each time slot being 0 and 4;

for a subframe employing an extended cyclic prefix, carrying reference signals of a plurality of antenna ports in the first antenna port group on symbols numbered 0 and 3 per slot.

4. The method of claim 1, wherein the loading the reference signals of the plurality of antenna ports in the second antenna port group in the same symbol comprises:

the reference signals of the plurality of antenna ports in the second antenna port group are carried on a symbol with a time slot number of 1.

5. The method according to any one of claims 1, 3, 4,

for a subframe adopting a conventional cyclic prefix, the number of symbols of each time slot is 0, 1, 2, 3, 4, 5 and 6 in sequence;

6. The method according to any one of claims 1 to 4, further comprising:

and determining the frequency domain initial position of the reference signal of each antenna port according to the cell identification.

7. The method according to any one of claims 1 to 4, further comprising:

setting the position of the reference signal corresponding to the first antenna port group and the position of the reference signal corresponding to the second antenna port group as cell-specific, and setting the position of the reference signal corresponding to the third antenna port group as user-specific; or

Setting the position of the reference signal corresponding to the first antenna port group, the position of the reference signal corresponding to the second antenna port group and the position of the reference signal corresponding to the third antenna port group as cell-specific;

wherein the cell-specific means that each resource block of the symbol carries a reference signal of the antenna port;

the user exclusive refers to that the reference signal of the antenna port is borne on the time frequency resource where the user physical downlink shared channel is located.

8. A signal transmission method, comprising:

dividing 8 antenna ports into 3 antenna port groups, wherein the first antenna port group comprises 2 antenna ports, the second antenna port group comprises 2 antenna ports, and the third antenna port group comprises 4 antenna ports;

for each antenna port group, respectively bearing the reference signals of the antenna ports in the antenna port group in the same symbol;

9. The method of claim 8, wherein for each antenna port group, respectively carrying the reference signals of the antenna ports in the same symbol specifically comprises:

for the first antenna port group, under the condition of adopting a conventional cyclic prefix, carrying reference signals of 2 antenna ports thereof on symbols with the number of each time slot being 0 and 4; under the condition of adopting the extended cyclic prefix, bearing the reference signals of 2 antenna ports on the symbols with the serial numbers of 0 and 3 in each time slot;

for the second antenna port group, carrying the reference signals of 2 antenna ports thereof on the symbol numbered 1 of each time slot;

for the third antenna port group, carrying reference signals of 4 antenna ports thereof on symbols numbered 2 and/or 5 of each time slot under the condition of adopting a conventional cyclic prefix; under the condition of adopting the extended cyclic prefix, bearing the reference signals of 4 antenna ports on the symbols with the number of each time slot being 2 and/or 4;

10. The method of claim 8,

for a subframe adopting a conventional cyclic prefix, the number of each slot symbol is 0, 1, 2, 3, 4, 5 and 6;

for a subframe with an extended cyclic prefix, the number of symbols of each slot is 0, 1, 2, 3, 4, 5.

11. The method according to claim 8 or 9, characterized in that the method further comprises:

12. The method according to claim 8 or 9, characterized in that the method further comprises:

wherein,

the cell-specific means that each resource block of the symbol carries a reference signal of the antenna port;

13. The method according to claim 8 or 9, wherein the process of grouping 8 antenna ports into 3 antenna port groups comprises:

setting the antenna port numbers corresponding to the 8 antenna ports to be 0, 1, 2, 3, 4, 5, 6 and 7 respectively, wherein the first antenna port group comprises the antenna ports with the antenna port numbers of 0 and 1, the second antenna port group comprises the antenna ports with the antenna port numbers of 2 and 3, and the third antenna port group comprises the antenna ports with the antenna port numbers of 4, 5, 6 and 7; or

Set up the antenna port number that 8 antenna ports correspond is 0, 1, 2, 3, 6, 7, 8, 9 respectively, wherein, first antenna port group contains the antenna port number and is 0 and 1, second antenna port group contains the antenna port number and is 2 and 3, third antenna port group contains the antenna port number and is 6, 7, 8, 9.