CN101291163B - Pre-coding method, system and device in time division duplex system - Google Patents

Pre-coding method, system and device in time division duplex system Download PDF

Info

Publication number
CN101291163B
CN101291163B CN 200710098413 CN200710098413A CN101291163B CN 101291163 B CN101291163 B CN 101291163B CN 200710098413 CN200710098413 CN 200710098413 CN 200710098413 A CN200710098413 A CN 200710098413A CN 101291163 B CN101291163 B CN 101291163B
Authority
CN
China
Prior art keywords
codebook
codebook precoding
precoding mode
base station
module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN 200710098413
Other languages
Chinese (zh)
Other versions
CN101291163A (en
Inventor
索士强
苏昕
吴群英
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Academy of Telecommunications Technology CATT
Datang Mobile Communications Equipment Co Ltd
Original Assignee
China Academy of Telecommunications Technology CATT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Academy of Telecommunications Technology CATT filed Critical China Academy of Telecommunications Technology CATT
Priority to CN 200710098413 priority Critical patent/CN101291163B/en
Priority to PCT/CN2008/000788 priority patent/WO2008125021A1/en
Publication of CN101291163A publication Critical patent/CN101291163A/en
Application granted granted Critical
Publication of CN101291163B publication Critical patent/CN101291163B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0426—Power distribution

Abstract

The invention discloses a precoding method used in time-division-duplex system. The method comprises: the current upstream resources in a base station is observed; when the upstream resources exist, which can transmit upstream reference marks, codebook-based precoding mode is switched to non-codebook-based precoding mode; a terminal switches the codebook-based precoding mode to the non-codebook-based precoding mode, and the base station and the terminal carryout non-codebook-based precoding. The precoding method used in time-division-duplex system solves such problem in the prior art as the time division duplex system can not simultaneously support codebook-based and non-codebook-based precoding modes. The invention simultaneously discloses a precoding system and a device used in time division duplex system.

Description

Carry out the method, system and device of precoding in the tdd systems
Technical field
The present invention relates to communication technical field, particularly carry out the method, system and device of precoding in the tdd systems.
Background technology
Multiple-input and multiple-output (MIMO) has become the effective ways of generally acknowledged raising wireless transmission spectrum efficiency.Usually receiving terminal is easy to obtain channel information by channel estimating.But, if transmitting terminal is also known channel information, channel capacity is further enhanced.Precoding technique is a kind ofly to utilize channel information to carry out pretreated technology to transmitting at transmitting terminal, and precoding is data flow to be sent to be multiply by pre-coding matrix it is shone upon, and sends.
In long evolving system (LTE), employing spatial pre-coding (pre-coding) technology can improve systematic function and reduce the complexity of subscriber equipment (UE).According to whether adopting limited pre-coding matrix, pre-coding can be divided into code book (Codebook) pre-encode operation and non-code book (Non-Codebook) pre-encode operation.For guaranteeing the common point of Frequency Division Duplexing (FDD) (FDD) system and time division duplex (TDD) system, require the support of TDD system to use the Codebook pre-encode operation; Simultaneously, in order to utilize the channel symmetry of TDD system, also can adopt the Non-Codebook pre-encode operation.
The Non-Codebook pre-encode operation refers to that base station side is by receiving upward signal, obtain the spatial channel information of up direction, utilize the channel symmetry of TDD system, obtain the spatial channel information of down direction, thereby utilize this spatial channel information to obtain pre-coding matrix, and carry out pre-encode operation.
Such as: have M root transmitting antenna for a base station side, end side has the TDD system of N root reception antenna, the base station can be by receiving upward signal, the spatial channel matrix that obtains up direction is HUL, utilize the reciprocity of TDD system up-downgoing channel so, can directly obtain descending spatial channel matrix H by the upstream space channel matrix DL=(H UL) TH wherein ULDimension be M * N, H DLDimension be N * M.To the down channel matrix H DLCarry out singular value decomposition (SVD) and just can obtain the pre-coding matrix V of down direction B:
H DL＝UΛV H
Λ BBe that (characteristic value of the individual non-zero of B≤min (M, N)) notices that we suppose that the characteristic value of Λ is descending for the B of Λ.V BBe the characteristic value characteristic of correspondence vector of non-zero, V BBe (orthogonal matrix on rank of M * B),
When carrying out the Non-Codebook pre-encode operation, require data symbol and reference symbol all to carry out pre-encode operation, namely
X＝V BS
Y＝V BD
Wherein S is the data symbol that is ready for sending, and dimension is B * 1; X is the data-signal that precoding sends at M root antenna afterwards, and dimension is M * 1; D is the reference symbol that is ready for sending, and dimension is B * 1; Y is the reference signal that precoding sends at M root antenna afterwards; V is pre-coding matrix, and dimension is M * B.
And for the Codebook pre-encode operation, system needs in advance predetermined one group of pre-coding matrix, is called codebook.Such as, work as M=4, during B=2, can adopt following method to make up codebook:
1 2 0 1 2 exp ( j φ 1 ) 0 0 1 2 0 1 2 exp ( j φ 2 )
Wherein φ i ∈ { πn 2 , n = 0,1,2,3 }
Have 16 pre-coding matrixes like this, concrete, can be numbered for each pre-coding matrix, the pre-coding matrix after the numbering is designated as V (i), i=0...15.
Terminal can obtain descending spatial channel matrix H by after the descending common reference symbol of reception DL, and pass through certain criterion and in codebook, select suitable pre-coding matrix V BSuch as, receiving terminal adopts minimum Mean Square Error Linear to detect (MMSE) algorithm and selects pre-coding matrix V BWhen adopting different pre-coding matrix, the mean square error of estimated signal is:
MSE(i)＝trace((I+V(i) *(H DL) *R nn -1H DLV(i)) -1)，i＝0...15
Wherein I is unit matrix; () *Representing matrix grip transposition altogether; R NnBe the noise variance matrix.
The sequence number of pre-coding matrix V is so:
index = arg min i = 0 . . . 15 ( MSE ( i ) )
Terminal feeds back to the base station with this sequence number, and the base station utilizes this sequence number, obtains corresponding pre-coding matrix V in codebook B=V B(index).
When carrying out the Codebook pre-encode operation, have only data symbol to carry out pre-encode operation, and reference symbol is not carried out pre-encode operation, that is:
X＝V BS
Y＝D
Wherein S is the data symbol that is ready for sending, and dimension is B * 1; X is the data-signal that precoding sends at M root antenna afterwards, and dimension is M * 1; D and the Y reference symbol for sending at M root antenna, dimension is M * 1; V BBe pre-coding matrix, dimension is M * B.
As seen adopt the Non-codebook pre-encode operation can save required expenses such as feedback signaling greatly for the TDD system, amount of calculation is placed on the base station end, reduce the burden of terminal, but need the base station from the transmission of uplink reference symbol, to obtain channel matrix, thereby require terminal the ability of two antenna emissions to be arranged or can carry out two antennas and switch emission, and in the frequency range of downlink precoding transmission, send the upstream data symbol and/or survey reference symbol; Adopt the Codebook pre-encode operation not need from the transmission of uplink reference symbol, to obtain channel matrix, emission does not require Codebook pre-encode operation itself to terminal, just amount of calculation is placed on terminal, the base station obtains corresponding pre-coding matrix by the pre-coding matrix sequence number of terminal feedback from Codebook.
But the TDD system can not support Non-codebook and two kinds of pre-encode operation of Codebook simultaneously at present, thereby causes the wasting of resources, has increased expense.
Summary of the invention
Carry out the method, system and device of precoding in the tdd systems that the embodiment of the invention provides, in order to solve the problem that to support Non-codebook and two kinds of pre-encode operation of Codebook in the TDD system that exists in the prior art simultaneously.
The method of carrying out precoding in a kind of tdd systems comprises:
Current ascending resource is checked in the base station, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode is switched to the non-codebook precoding mode, and sends the control signaling that comprises non-code book to terminal; Terminal switches to the non-codebook precoding mode with the codebook precoding mode after receiving control signaling from described base station, and described base station and described terminal are carried out the non-codebook precoding operation.
The step that the non-codebook precoding operation is carried out in described base station comprises:
A, described base station check whether can obtain channel matrix from the transmission of uplink reference symbol, if then obtain described channel matrix, and execution in step B, otherwise the notice terminal sends described uplink reference symbol, and from described uplink reference symbol, obtain channel matrix, and execution in step B;
Pre-coding matrix is determined according to described channel matrix in B, described base station, according to described pre-coding matrix, the parameter symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation.
Also comprise after the step B:
Parameter symbol and the data symbol of described base station after with precoding sends to described terminal;
Then the described terminal step of carrying out non-codebook precoding operation comprises:
Described terminal is carried out channel estimating to the described parameter symbol of receiving, obtains equivalent channel matrix, carries out data demodulates.
The method of carrying out precoding in a kind of tdd systems comprises:
Current ascending resource is checked in the base station, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode is switched to the codebook precoding mode, and sends the control signaling that comprises described code book to described terminal; Terminal switches to the codebook precoding mode with the non-codebook precoding mode after receiving control signaling from described base station, and described base station and described terminal are carried out the codebook precoding operation.
The step that the codebook precoding operation is carried out in described base station comprises:
A, described base station send the common reference symbol of not carrying out precoding to terminal periodic;
B, described base station determine corresponding pre-coding matrix according to the pre-coding matrix sequence number of receiving from described terminal, and the parameter symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation;
Then described terminal also comprises after the non-codebook precoding mode is switched to the codebook precoding mode:
Behind the described common parameter symbol of receiving from described base station, from described code book, select suitable pre-coding matrix, described pre-coding matrix sequence number is sent to described base station.
Also comprise after the step B:
Parameter symbol and the data symbol of described base station after with precoding sends to described terminal;
Then the described terminal step of carrying out codebook precoding operation comprises:
Described terminal is carried out channel estimating to the described parameter symbol of receiving, obtains equivalent channel matrix, carries out data demodulates.
The system that carries out precoding in a kind of tdd systems comprises:
The base station, be used for checking current ascending resource, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode switched to the non-codebook precoding mode, and send the control signaling that comprises described non-code book to described terminal, carry out the non-codebook precoding operation;
Terminal is used for after the control signaling of receiving from described base station the codebook precoding mode being switched to the non-codebook precoding mode, carries out the non-codebook precoding operation.
Described base station comprises:
Configuration module is used for checking current described ascending resource, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode is switched to the non-codebook precoding mode;
Processing module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation;
Described terminal comprises:
Handover module is used for the codebook precoding mode is switched to the non-codebook precoding mode;
Operational module is used for after described handover module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation.
Described base station also comprises:
First sending module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, sends the control signaling that comprises described non-code book to described terminal;
After then described handover module is received described control signaling, the codebook precoding mode is switched to the non-codebook precoding mode.
Described processing module also comprises:
Acquisition module, be used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, check whether can from the transmission of uplink reference symbol, obtain channel matrix, if, then obtain described channel matrix, otherwise, notify described base station to send described uplink reference symbol, and from described uplink reference symbol, obtain channel matrix;
Precoding module is used for determining pre-coding matrix according to the channel matrix that described acquisition module obtains, and according to described pre-coding matrix, the parameter symbol of described data symbol and the described data symbol of demodulation is carried out pre-encode operation.
Described base station also comprises:
Second sending module is used for parameter symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal;
Then described operational module also comprises:
Channel estimation module is used for the described parameter symbol of receiving is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
The system that carries out precoding in a kind of tdd systems comprises:
The base station, be used for checking current ascending resource, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode switched to the codebook precoding mode, and send the control signaling that comprises described code book to described terminal, carry out the codebook precoding operation;
Terminal is used for after receiving the control signaling of described base station the non-codebook precoding mode being switched to the codebook precoding mode, carries out the codebook precoding operation.
Described base station comprises:
Configuration module is used for checking current described ascending resource, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode is switched to the codebook precoding mode;
Processing module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation;
Described terminal comprises:
Handover module is used for the non-codebook precoding mode is switched to the codebook precoding mode;
Operational module is used for after described handover module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation.
Described base station also comprises:
First sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the control signaling that comprises described code book to described terminal;
After then described handover module is received described control signaling, the non-codebook precoding mode is switched to the codebook precoding mode.
Described processing module also comprises:
Second sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the common reference symbol of not carrying out precoding to described terminal periodic;
Precoding module is used for determining corresponding pre-coding matrix according to the precoding mode sequence number of receiving from described terminal, and the parameter symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation;
Then described terminal also comprises:
Select module, be used at described handover module the non-codebook precoding mode being switched to the codebook precoding mode, and after receiving the described common parameter symbol from described base station, from described code book, select suitable pre-coding matrix, described pre-coding matrix sequence number is sent to described base station.
Described base station also comprises:
The 3rd sending module is used for parameter symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal;
Then described operational module also comprises:
Channel estimation module is used for the described parameter symbol of receiving is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
A kind of base station comprises:
Configuration module is used for checking current ascending resource, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode is switched to the non-codebook precoding mode;
Processing module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation.
Described base station also comprises:
First sending module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, sends the control signaling that comprises described non-code book to described terminal.
Described processing module also comprises:
Acquisition module, be used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, check whether can from the transmission of uplink reference symbol, obtain channel matrix, if, then obtain described channel matrix, otherwise, notify described base station to send described uplink reference symbol, and from described uplink reference symbol, obtain channel matrix;
Precoding module is used for determining pre-coding matrix according to the channel matrix that described acquisition module obtains, and according to described pre-coding matrix, the parameter symbol of described data symbol and the described data symbol of demodulation is carried out pre-encode operation.
Described base station also comprises:
Second sending module is used for parameter symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal.
A kind of terminal comprises:
Handover module is used for after the control signaling of receiving from the base station that comprises non-code book the codebook precoding mode being switched to the non-codebook precoding mode;
Operational module is used for after described handover module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation.
Described operational module also comprises:
Channel estimation module is used for the parameter symbol of receiving from after the precoding of described base station is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
A kind of base station comprises:
Configuration module is used for checking current ascending resource, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode is switched to the codebook precoding mode;
Processing module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation.
Described base station also comprises:
First sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the control signaling that comprises described code book to described terminal.
Described processing module also comprises:
Second sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the common reference symbol of not carrying out precoding to described terminal periodic;
Precoding module is used for determining corresponding pre-coding matrix according to the precoding mode sequence number of receiving from described terminal, and the parameter symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation.
Described base station also comprises:
The 3rd sending module is used for parameter symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal.
A kind of terminal comprises:
Handover module is used for after the control signaling of receiving from the base station that comprises code book the non-codebook precoding mode being switched to the codebook precoding mode;
Operational module is used for after described handover module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation.
Described terminal also comprises:
Select module, be used at described handover module the non-codebook precoding mode being switched to the codebook precoding mode, and after receiving the described common parameter symbol from described base station, from described code book, select suitable pre-coding matrix, described pre-coding matrix sequence number is sent to described base station.
Described operational module also comprises:
Channel estimation module is used for the parameter symbol of receiving from after the precoding of described base station is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
Current ascending resource is checked in embodiment of the invention base station, when the described ascending resource that can send uplink reference symbol is arranged, described base station switches to the non-codebook precoding mode with the precoding mode, and send the control signaling comprise described non-code book to terminal, described terminal switches to the non-codebook precoding mode with the precoding mode after receiving described control signaling; When not having to send the described ascending resource of uplink reference symbol, described base station switches to the codebook precoding mode with the precoding mode, and send the control signaling comprise described code book to terminal, described terminal switches to the codebook precoding mode with the precoding mode after receiving described control signaling.Thereby make the TDD system can support two kinds of pre-encode operation simultaneously, saved resource, reduced expense.
Description of drawings
Fig. 1 forms schematic diagram for the system that Codebook precoding mode in the embodiment of the invention tdd systems switches to Non-codebook precoding mode;
Fig. 2 A is the base station composition schematic diagram that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems;
Fig. 2 B is the terminal composition schematic diagram that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems;
Fig. 3 forms schematic diagram for the system that Non-codebook precoding mode in the embodiment of the invention tdd systems switches to Codebook precoding mode;
Fig. 4 A is the base station composition schematic diagram that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems;
Fig. 4 B is the terminal composition schematic diagram that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems;
Fig. 5 switches to the method flow schematic diagram of Non-codebook precoding mode for Codebook precoding mode in the embodiment of the invention tdd systems;
Fig. 6 switches to the method flow schematic diagram of Codebook precoding mode for Non-codebook precoding mode in the embodiment of the invention tdd systems;
Fig. 7 carries out the method flow schematic diagram of Non-codebook pre-encode operation for base station in the embodiment of the invention;
Fig. 8 carries out the method flow schematic diagram of Codebook pre-encode operation for base station in the embodiment of the invention.
Embodiment
At the problem that can not support Non-codebook and two kinds of pre-encode operation of Codebook in the present TDD system simultaneously, the present invention proposes a kind of solution, specifically: current ascending resource is checked in the base station, when the ascending resource that can send uplink reference symbol is arranged, the base station switches to Non-codebook precoding mode with Codebook precoding mode, and send the control signaling comprise Non-codebook to terminal, after terminal is received described control signaling, Codebook precoding mode is switched to Non-codebook precoding mode; When not having to send the ascending resource of uplink reference symbol, the base station switches to Codebook precoding mode with Non-codebook precoding mode, and send the control signaling comprise Codebook to terminal, after terminal is received described control signaling, the precoding mode is switched to Codebook precoding mode, thereby solved the problems referred to above.
As shown in Figure 1, the system that Codebook precoding mode switches to Non-codebook precoding mode in the tdd systems in the embodiment of the invention comprises: base station 10 and terminal 20.
Base station 10, with terminal 20 wireless connections, be used for checking current ascending resource, when the ascending resource that can send uplink reference symbol is arranged, Codebook precoding mode is switched to Non-codebook precoding mode, comprise the control signaling of Non-codebook to the terminal transmission, and carry out the Non-codebook pre-encode operation.Terminal 20 after the control signaling of receiving from base station 10 that comprises Non-codebook, switches to Non-codebook precoding mode with Codebook precoding mode, and carries out the Non-codebook pre-encode operation.
Base station 10 can be according to setting, and the cycle is checked current ascending resource, can also check current ascending resource in needs.
Shown in Fig. 2 A, the base station that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems comprises: configuration module 100 and processing module 110.
Configuration module 100 is connected with processing module 110, is used for checking current ascending resource, when the ascending resource that can send uplink reference symbol is arranged, Codebook precoding mode is switched to Non-codebook precoding mode.
Processing module 110 is connected with configuration module 100, is used for carrying out the Non-codebook pre-encode operation after configuration module 100 switches to Non-codebook precoding mode with Codebook precoding mode.
Wherein, processing module 110 can also comprise: acquisition module 1100 and precoding module 1110.
Acquisition module 1100, be connected with precoding module 1110, be used for after configuration module 100 switches to Non-codebook precoding mode with Codebook precoding mode, check whether can from the transmission of uplink reference symbol, obtain channel matrix, if, then obtain channel matrix, otherwise, notice terminal 20 sends uplink reference symbol, and obtains channel matrix from uplink reference symbol.
Precoding module 1110 is used for determining pre-coding matrix according to the channel matrix that acquisition module 1100 obtains, and according to pre-coding matrix, the parameter symbol of data symbol and this data symbol of demodulation is carried out pre-encode operation.
The base station that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems can further include: first sending module 120.
First sending module 120 is connected with configuration module 100, is used for after configuration module 100 switches to Non-codebook precoding mode with Codebook precoding mode, sends the control signaling that comprises Non-codebook to terminal 20.
The base station that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems can further include: second sending module 130.
Second sending module 130 is connected with processing module 110, is used for parameter symbol and data symbol that processing module 110 is carried out after the precoding are sent to terminal 20.
Shown in Fig. 2 B, the terminal that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems comprises: handover module 200 and operational module 210.
Handover module 200 is connected with operational module 210, is used for after the control signaling of receiving from base station 10 that comprises Non-codebook Codebook precoding mode being switched to Non-codebook precoding mode; Operational module 210 is used for carrying out the Non-codebook pre-encode operation after handover module 200 switches to Non-codebook precoding mode with Codebook precoding mode.
Wherein, operational module 210 also comprises:
Channel estimation module 2100 is used for the parameter symbol of receiving from after the precoding of base station 10 is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
As shown in Figure 3, the system that Non-codebook precoding mode switches to Codebook precoding mode in the inventive embodiments tdd systems comprises: base station 30 and terminal 40.
Base station 30, with terminal 40 wireless connections, be used for checking current ascending resource, when not having to send the ascending resource of uplink reference symbol, Non-codebook precoding mode is switched to Codebook precoding mode, comprise the control signaling of Codebook to the terminal transmission, and carry out the Codebook pre-encode operation.Terminal 40 switches to Codebook precoding mode with Non-codebook precoding mode, and carries out the Codebook pre-encode operation after receiving the control signaling that comprises Codebook from base station 30.
Base station 30 can be according to setting, and the cycle judges whether to be useful on the ascending resource that sends uplink reference symbol, can also judge whether to be useful on the ascending resource that sends uplink reference symbol in needs.
Shown in Fig. 4 A, the base station that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems comprises: configuration module 300 and processing module 310.
Configuration module 300 is connected with processing module 310, is used for checking current ascending resource, when not having to send the ascending resource of uplink reference symbol, Non-codebook precoding mode is switched to Codebook precoding mode.Processing module 310 is used for carrying out the Codebook pre-encode operation after configuration module 300 switches to Codebook precoding mode with Non-codebook precoding mode.
Wherein, processing module 310 can also comprise: second sending module 3100 and precoding module 3110.
Second sending module 3100 is used for after configuration module 300 switches to Codebook precoding mode with Non-codebook precoding mode, sends the common reference symbol of not carrying out precoding to 40 cycles of terminal.
Precoding module 3110, be used for according to the precoding mode sequence number of receiving of coming self terminal 40, determine corresponding pre-coding matrix, the parameter symbol of data symbol and demodulating data symbols is carried out pre-encode operation, the parameter symbol after the precoding is sent to terminal 40.
The base station that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems can further include: first sending module 320.
First sending module 320 is connected with configuration module 300, is used for after configuration module 300 switches to Codebook precoding mode with Non-codebook precoding mode, sends the control signaling that comprises Codebook to terminal 40.
The base station that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems can further include: the 3rd sending module 330.
The 3rd sending module 330 is connected with processing module 310, is used for parameter symbol and data symbol that processing module 310 is carried out after the precoding are sent to terminal 40.
Shown in Fig. 4 B, the terminal that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems comprises: handover module 400 and operational module 410.
Handover module 400 is connected with operational module 410, is used for after the control signaling of receiving from base station 30 that comprises Codebook Non-codebook precoding mode being switched to Codebook precoding mode; Operational module 410 is used for carrying out the Codebook pre-encode operation after handover module 400 switches to Codebook precoding mode with Non-codebook precoding mode.
Wherein, operational module 410 also comprises:
Channel estimation module 4100 is used for the parameter symbol of receiving from after the precoding of base station 30 is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
The terminal that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems also further comprises: select module 420.
Select module 420, be connected with handover module 400, be used at handover module 400 Non-codebook precoding mode being switched to Codebook precoding mode, and after receiving the common parameter symbol from base station 30, from Codebook, select suitable pre-coding matrix, the pre-coding matrix sequence number is sent to base station 30.
In order to have saved resource, reduce expense, obtain systematic function preferably, Codebook need be switched to Non-codebook as channel information.
As shown in Figure 5, the method that Codebook precoding mode switches to Non-codebook precoding mode in the embodiment of the invention tdd systems comprises the following steps:
Current ascending resource is checked in step 500, base station, when the ascending resource that can send uplink reference symbol is arranged, Codebook precoding mode is switched to Non-codebook precoding mode, and sends the control signaling that comprises Non-codebook to terminal.
The Non-codebook pre-encode operation is carried out in step 501, base station.
Step 502, terminal switch to Non-codebook precoding mode with Codebook precoding mode after receiving control signaling from the base station, carry out the Non-codebook pre-encode operation.
Wherein, in the step 500, the base station can be according to setting, and the cycle is checked current ascending resource, also can check current ascending resource in needs.
When terminal can not send uplink reference symbol according to its ability, need to adopt the method for selecting Codebook, inform to the base station by upstream control signaling, Codebook need be switched to Non-codebook.
As shown in Figure 6, the method that Non-codebook precoding mode switches to Codebook precoding mode in the embodiment of the invention tdd systems comprises the following steps:
Current ascending resource is checked in step 600, base station, when not having to send the ascending resource of uplink reference symbol, Non-codebook precoding mode is switched to Codebook precoding mode, and sends the control signaling that comprises Codebook to terminal.
Step 601, terminal switch to Codebook precoding mode with Non-codebook precoding mode after receiving control signaling from the base station.
Step 602, base station and terminal are carried out the Codebook pre-encode operation.
Wherein, in the step 600, the base station can be according to setting, and the cycle is checked current ascending resource, can also check current ascending resource in needs.
Understand and realization the present invention for the ease of persons skilled in the art, now lift instantiation, further specify technical scheme of the present invention.
As shown in Figure 7, the method that the Non-codebook pre-encode operation is carried out in the base station in the embodiment of the invention comprises the following steps:
The precoding mode of step 700, base station and terminal is set to Codebook precoding mode.
Step 701, base station judge in the current ascending resource whether the ascending resource that can send uplink reference symbol is arranged, if then execution in step 702; Otherwise, jump out this flow process.
Step 702, base station switch to Non-codebook precoding mode with Codebook precoding mode, and send the control signaling that comprises Non-codebook to terminal.
Step 703, terminal switch to Non-codebook precoding mode with Codebook precoding mode after receiving the control signaling that comprises Non-codebook from the base station.
Step 704, base station cycle send the common reference symbol of not carrying out precoding.
Step 705, base station check whether can obtain channel matrix from the transmission of uplink reference symbol, if then execution in step 706; Otherwise, execution in step 707.
Step 706, base station obtain channel matrix from the transmission of uplink reference symbol, and execution in step 708.
Step 707, base station notice terminal send uplink reference symbol, and obtain channel matrix from uplink reference symbols.
Step 708, base station utilize the channel matrix that obtains to determine pre-coding matrix, and the reference symbol of data symbol and this data symbol of demodulation is carried out pre-encode operation, and the reference symbol after the precoding and data symbol are sent to terminal.
Step 709, terminal are carried out channel estimating according to the reference symbol of receiving, obtain the channel matrix of equivalence, carry out data demodulates.
As shown in Figure 8, the method that the Codebook pre-encode operation is carried out in the base station in the embodiment of the invention comprises the following steps:
The precoding mode of step 800, base station and terminal is set to Non-codebook precoding mode.
Step 801, base station judge in the current ascending resource whether the ascending resource that can send uplink reference symbol is arranged, if then jump out this flow process; Otherwise, execution in step 802.
Step 802, base station switch to Codebook precoding mode with Non-codebook precoding mode, and send the control signaling that comprises Codebook to terminal.
Step 803, terminal switch to Codebook precoding mode with Non-codebook precoding mode after receiving the control signaling that comprises Codebook from the base station.
Step 804, base station cycle send the common reference symbol of not carrying out precoding.
Step 805, terminal obtain channel matrix according to the common reference symbol of receiving from the base station, and select suitable pre-coding matrix from Codebook, and the sequence number of this pre-coding matrix is sent to the base station.
Pre-coding matrix is determined according to the sequence number of receiving of coming self terminal in step 806, base station from Codebook, the reference symbol of data symbol and this data symbol of demodulation is carried out pre-encode operation, and the reference symbol after the precoding and data symbol are sent to terminal.
Step 807, terminal are carried out channel estimating according to the reference symbol of receiving, obtain the channel matrix of equivalence, carry out data demodulates.
From above-described embodiment as can be seen: in the embodiment of the invention, current ascending resource is checked in the base station, when the ascending resource that can send uplink reference symbol is arranged, the base station switches to Non-codebook precoding mode with Codebook precoding mode, and send the control signaling comprise Non-codebook to terminal, after terminal is received described control signaling, Codebook precoding mode is switched to Non-codebook precoding mode; When not having to send the ascending resource of uplink reference symbol, the base station switches to Codebook precoding mode with Non-codebook precoding mode, and send the control signaling comprise Codebook to terminal, after terminal is received described control signaling, the precoding mode is switched to Codebook precoding mode, thereby solved the problems referred to above.Thereby make the TDD system can support two kinds of pre-encode operation simultaneously, saved resource, reduced expense.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.

Claims (23)

1. the method for carrying out precoding in the tdd systems is characterized in that this method comprises:
Current ascending resource is checked in the base station, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode is switched to the non-codebook precoding mode, and sends the control signaling that comprises non-code book to terminal;
Described terminal switches to the non-codebook precoding mode with the codebook precoding mode after receiving control signaling from described base station;
Described base station and described terminal are carried out the non-codebook precoding operation.
2. the method for claim 1 is characterized in that, the step that the non-codebook precoding operation is carried out in described base station comprises:
A, described base station check whether can obtain channel matrix from the transmission of uplink reference symbol,
If, then obtain described channel matrix, and execution in step B,
Otherwise the notice terminal sends described uplink reference symbol, and obtains channel matrix from described uplink reference symbol, and execution in step B;
Pre-coding matrix is determined according to described channel matrix in B, described base station, according to described pre-coding matrix, the reference symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation.
3. the method for carrying out precoding in the tdd systems is characterized in that this method comprises:
Current ascending resource is checked in the base station, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode is switched to the codebook precoding mode, and sends the control signaling that comprises described code book to terminal; Terminal switches to the codebook precoding mode with the non-codebook precoding mode after receiving control signaling from described base station, and described base station and described terminal are carried out the codebook precoding operation.
4. method as claimed in claim 3 is characterized in that, the step that the codebook precoding operation is carried out in described base station comprises:
A, described base station send the common reference symbol of not carrying out precoding to terminal periodic;
Corresponding pre-coding matrix is determined according to the pre-coding matrix sequence number of receiving from described terminal in B, described base station, and the reference symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation;
Then described terminal also comprises after the non-codebook precoding mode is switched to the codebook precoding mode:
After the described common reference symbol of receiving from described base station, from described code book, select suitable pre-coding matrix, described pre-coding matrix sequence number is sent to described base station.
5. the system that carries out precoding in the tdd systems is characterized in that this system comprises:
The base station, be used for checking current ascending resource, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode switched to the non-codebook precoding mode, and send the control signaling comprise described non-code book to terminal, carry out the non-codebook precoding operation;
Terminal is used for after the control signaling of receiving from described base station the codebook precoding mode being switched to the non-codebook precoding mode, carries out the non-codebook precoding operation;
Wherein, described base station comprises:
Configuration module is used for checking current described ascending resource, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode is switched to the non-codebook precoding mode; And
Processing module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation;
Described terminal comprises:
Handover module is used for the codebook precoding mode is switched to the non-codebook precoding mode; And
Operational module is used for after described handover module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation.
6. system as claimed in claim 5 is characterized in that, described base station also comprises:
First sending module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, sends the control signaling that comprises described non-code book to described terminal;
After then described handover module is received described control signaling, the codebook precoding mode is switched to the non-codebook precoding mode.
7. system as claimed in claim 5 is characterized in that, described processing module also comprises:
Acquisition module, be used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, check whether can from the transmission of uplink reference symbol, obtain channel matrix, if, then obtain described channel matrix, otherwise, notify described terminal to send described uplink reference symbol, and from described uplink reference symbol, obtain channel matrix;
Precoding module is used for determining pre-coding matrix according to the channel matrix that described acquisition module obtains, and according to described pre-coding matrix, the reference symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation.
8. system as claimed in claim 7 is characterized in that, described base station also comprises:
Second sending module is used for reference symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal;
Then described operational module also comprises:
Channel estimation module is used for the described reference symbol of receiving is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
9. the system that carries out precoding in the tdd systems is characterized in that this system comprises:
The base station, be used for checking current ascending resource, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode switched to the codebook precoding mode, and send the control signaling comprise described code book to terminal, carry out the codebook precoding operation;
Terminal is used for after receiving the control signaling of described base station the non-codebook precoding mode being switched to the codebook precoding mode, carries out the codebook precoding operation;
Wherein, described base station comprises:
Configuration module is used for checking current described ascending resource, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode is switched to the codebook precoding mode; And
Processing module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation;
Described terminal comprises:
Handover module is used for the non-codebook precoding mode is switched to the codebook precoding mode; And
Operational module is used for after described handover module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation.
10. system as claimed in claim 9 is characterized in that, described base station also comprises:
First sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the control signaling that comprises described code book to described terminal;
After then described handover module is received described control signaling, the non-codebook precoding mode is switched to the codebook precoding mode.
11. system as claimed in claim 9 is characterized in that, described processing module also comprises:
Second sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the common reference symbol of not carrying out precoding to described terminal periodic;
Precoding module is used for determining corresponding pre-coding matrix according to the pre-coding matrix sequence number of receiving from described terminal, and the reference symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation;
Then described terminal also comprises:
Select module, be used at described handover module the non-codebook precoding mode being switched to the codebook precoding mode, and after receiving the described common reference symbol from described base station, from described code book, select suitable pre-coding matrix, described pre-coding matrix sequence number is sent to described base station.
12. system as claimed in claim 11 is characterized in that, described base station also comprises:
The 3rd sending module is used for reference symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal;
Then described operational module also comprises:
Channel estimation module is used for the described reference symbol of receiving is carried out channel estimating, obtains equivalent channel matrix, carries out data demodulates.
13. a base station is characterized in that, this base station comprises:
Configuration module is used for checking current ascending resource, when the described ascending resource that can send uplink reference symbol is arranged, the codebook precoding mode is switched to the non-codebook precoding mode;
Processing module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation;
First sending module is used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, sends the control signaling that comprises described non-code book to terminal.
14. base station as claimed in claim 13 is characterized in that, described processing module also comprises:
Acquisition module, be used for after described configuration module switches to the non-codebook precoding mode with the codebook precoding mode, check whether can from the transmission of uplink reference symbol, obtain channel matrix, if, then obtain described channel matrix, otherwise, notify described terminal to send described uplink reference symbol, and from described uplink reference symbol, obtain channel matrix;
Precoding module is used for determining pre-coding matrix according to the channel matrix that described acquisition module obtains, and according to described pre-coding matrix, the reference symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation.
15. base station as claimed in claim 14 is characterized in that, described base station also comprises:
Second sending module is used for reference symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal.
16. a terminal is characterized in that, this terminal comprises:
Handover module, be used for after the control signaling of receiving from the base station that comprises non-code book, the codebook precoding mode is switched to the non-codebook precoding mode, and wherein, the described control signaling that comprises non-code book is to send when the ascending resource that can send uplink reference symbol is arranged;
Operational module is used for after described handover module switches to the non-codebook precoding mode with the codebook precoding mode, carries out the non-codebook precoding operation.
17. terminal as claimed in claim 16 is characterized in that, described operational module also comprises:
Channel estimation module is used for carrying out channel estimating to what receive from the reference symbol after the precoding of described base station, obtains equivalent channel matrix, carries out data demodulates.
18. a base station is characterized in that, this base station comprises:
Configuration module is used for checking current ascending resource, when not having to send the described ascending resource of uplink reference symbol, the non-codebook precoding mode is switched to the codebook precoding mode;
Processing module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation;
First sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the control signaling that comprises described code book to terminal.
19. base station as claimed in claim 18 is characterized in that, described processing module also comprises:
Second sending module is used for after described configuration module switches to the codebook precoding mode with the non-codebook precoding mode, sends the common reference symbol of not carrying out precoding to terminal periodic;
Precoding module is used for determining corresponding pre-coding matrix according to the pre-coding matrix sequence number of receiving from described terminal, and the reference symbol of data symbol and the described data symbol of demodulation is carried out pre-encode operation.
20. base station as claimed in claim 19 is characterized in that, described base station also comprises:
The 3rd sending module is used for reference symbol and data symbol that described precoding module is carried out after the precoding are sent to described terminal.
21. a terminal is characterized in that, this terminal comprises:
Handover module, be used for after the control signaling of receiving from the base station that comprises code book, the non-codebook precoding mode is switched to the codebook precoding mode, and wherein, the described control signaling that comprises code book is not send when having to send the ascending resource of uplink reference symbol;
Operational module is used for after described handover module switches to the codebook precoding mode with the non-codebook precoding mode, carries out the codebook precoding operation.
22. terminal as claimed in claim 21 is characterized in that, described terminal also comprises:
Select module, be used at described handover module the non-codebook precoding mode being switched to the codebook precoding mode, and after receiving the common reference symbol from described base station, from described code book, select suitable pre-coding matrix, the pre-coding matrix sequence number is sent to described base station.
23. terminal as claimed in claim 21 is characterized in that, described operational module also comprises:
Channel estimation module is used for carrying out channel estimating to what receive from the reference symbol after the precoding of described base station, obtains equivalent channel matrix, carries out data demodulates.
CN 200710098413 2007-04-17 2007-04-17 Pre-coding method, system and device in time division duplex system Active CN101291163B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN 200710098413 CN101291163B (en) 2007-04-17 2007-04-17 Pre-coding method, system and device in time division duplex system
PCT/CN2008/000788 WO2008125021A1 (en) 2007-04-17 2008-04-17 Method, system and equipments for precoding in time division dual system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 200710098413 CN101291163B (en) 2007-04-17 2007-04-17 Pre-coding method, system and device in time division duplex system

Publications (2)

Publication Number Publication Date
CN101291163A CN101291163A (en) 2008-10-22
CN101291163B true CN101291163B (en) 2013-07-10

Family

ID=39863256

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 200710098413 Active CN101291163B (en) 2007-04-17 2007-04-17 Pre-coding method, system and device in time division duplex system

Country Status (2)

Country Link
CN (1) CN101291163B (en)
WO (1) WO2008125021A1 (en)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101741445B (en) * 2008-11-19 2013-03-27 中兴通讯股份有限公司 Non-codebook precoding MIMO transmission method and base station
CN101771507B (en) * 2009-01-05 2013-11-13 上海贝尔阿尔卡特股份有限公司 Method and device for eliminating intercell interference in multi-cell MIMO (Multiple Input Multiple Output) wireless communication network
EP2465210A1 (en) 2009-08-10 2012-06-20 Nokia Siemens Networks OY Apparatus and method for n0n-c0debook based precoding
CN101626262B (en) 2009-08-11 2012-12-19 中兴通讯股份有限公司 Method and device for selecting precoding matrix
CN102932114B (en) * 2011-08-12 2017-02-15 中兴通讯股份有限公司 Uplink precoding emitting method and device
CN109302221B (en) * 2017-07-25 2020-10-02 上海朗帛通信技术有限公司 User equipment, base station and corresponding method used for wireless communication
EP3738216A1 (en) * 2018-01-10 2020-11-18 SONY Corporation Flexible beamforming control
WO2019144264A1 (en) 2018-01-23 2019-08-01 南通朗恒通信技术有限公司 Method and apparatus used in user equipment for wireless communication, and method and apparatus used in base station for wireless communication
WO2019153224A1 (en) * 2018-02-09 2019-08-15 Qualcomm Incorporated Dynamic switching between non-codebook and codebook based uplink transmissions
CN110460360B (en) * 2018-05-08 2020-06-30 上海朗帛通信技术有限公司 Method and device used in user equipment and base station for wireless communication

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1835425A (en) * 2005-03-16 2006-09-20 松下电器产业株式会社 Self-adaptive modulation method based on multi-user precode
CN1838556A (en) * 2005-03-24 2006-09-27 松下电器产业株式会社 Downlink multi-user space-time packet pre-coding method
CN1890908A (en) * 2003-12-04 2007-01-03 法国电信公司 Method for the multi-antenna transmission of a linearly-precoded signal, corresponding devices, signal and reception method

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1779574A1 (en) * 2004-08-20 2007-05-02 Nokia Corporation System and method for precoding in a multiple-input multiple-output (mimo) system
KR100909539B1 (en) * 2004-11-09 2009-07-27 삼성전자주식회사 Apparatus and method for supporting various multi-antenna technologies in a broadband wireless access system using multiple antennas

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1890908A (en) * 2003-12-04 2007-01-03 法国电信公司 Method for the multi-antenna transmission of a linearly-precoded signal, corresponding devices, signal and reception method
CN1835425A (en) * 2005-03-16 2006-09-20 松下电器产业株式会社 Self-adaptive modulation method based on multi-user precode
CN1838556A (en) * 2005-03-24 2006-09-27 松下电器产业株式会社 Downlink multi-user space-time packet pre-coding method

Also Published As

Publication number Publication date
CN101291163A (en) 2008-10-22
WO2008125021A1 (en) 2008-10-23

Similar Documents

Publication Publication Date Title
CN101291163B (en) Pre-coding method, system and device in time division duplex system
CN109757127B (en) Method for reporting channel state information in wireless communication system and apparatus therefor
CN101383652B (en) Signal detection method and apparatus for MIMO system
CN101999210B (en) Method for transmitting and receiving downlink control information
EP4203340A1 (en) Method and apparatus for downlink and uplink channel state information acquisition
CN101686110B (en) Multi-input multi-output system, data transmission method and data transmission device thereof
EP2648445B1 (en) Method and device for reporting channel state
CN103222201B (en) For sending and receive the method and apparatus of codebook subset restriction bitmap
JP5400896B2 (en) Information transmitting apparatus and method in wireless communication system
EP1912362B1 (en) Communication device, and radio communication system
US8019016B1 (en) System and method of transmit beam selection
CN102035615B (en) MIMO-based downlink data transmission method, device and system
CN108028684A (en) The signal transmission/reception method and its equipment based on code book in multi-aerial radio communication system
CN107925466A (en) The signal transmission/reception method and its equipment based on code book in multi-aerial radio communication system
US20100151871A1 (en) Wireless Communication System And Wireless Communication Method
CN101485103A (en) Wireless communication system and wireless communication method
CN107925465A (en) The communication technology of CSI RS is used in mobile communication system
CN101582712B (en) Method for realizing precoding and method for generating precoding matrices
CN101944940A (en) Antenna selection method and device for mobile terminal
CN101626265A (en) Method for realizing downlink beam forming in wireless communication system
CN103138821A (en) Method, device and system for data transmission
CN102957467A (en) Method and system for processing signals of multiple antennas in downlink system
CN102598731B (en) Method and device for obtaining downlink channel status information
EP2983318B1 (en) Mobile station, base station, and communication control method
CN103036601A (en) Method and device for determining rank indication and pre-coding matrix index

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
ASS Succession or assignment of patent right

Owner name: INST OF TELECOMMUNICATION SCIENCE AND TECHNOLGOY

Free format text: FORMER OWNER: DATANG MOBILE COMMUNICATION EQUIPMENT CO., LTD.

Effective date: 20110422

C41 Transfer of patent application or patent right or utility model
COR Change of bibliographic data

Free format text: CORRECT: ADDRESS; FROM: 100083 NO. 29, XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING TO: 100191 NO. 40, XUEYUAN ROAD, HAIDIAN DISTRICT, BEIJING

TA01 Transfer of patent application right

Effective date of registration: 20110422

Address after: 100191 Haidian District, Xueyuan Road, No. 40,

Applicant after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY

Address before: 100083 Haidian District, Xueyuan Road, No. 29,

Applicant before: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd.

C14 Grant of patent or utility model
GR01 Patent grant
CP01 Change in the name or title of a patent holder
CP01 Change in the name or title of a patent holder

Address after: 100191 No. 40, Haidian District, Beijing, Xueyuan Road

Patentee after: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY

Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road

Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY

TR01 Transfer of patent right
TR01 Transfer of patent right

Effective date of registration: 20210528

Address after: 100085 1st floor, building 1, yard 5, Shangdi East Road, Haidian District, Beijing

Patentee after: DATANG MOBILE COMMUNICATIONS EQUIPMENT Co.,Ltd.

Address before: 100191 No. 40, Haidian District, Beijing, Xueyuan Road

Patentee before: CHINA ACADEMY OF TELECOMMUNICATIONS TECHNOLOGY