Method, device, and system for transmitting MU-MIMO pilot and data

• US 9,614,597 B2
• Filed: 12/30/2014
• Issued: 04/04/2017
• Est. Priority Date: 07/05/2012
• Status: Active Grant

• Current Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Original Assignee: Huawei Technologies Co., Ltd. (Huawei Investment & Holding Co., Ltd.)
• Inventors: Yi, Xiongshu, Guan, Lu, Yang, Jing
• Primary Examiner(s): VU, HOANG-CHUONG Q
• Application Number:
  US14/585,765
• Publication Number:
  US 20150171942A1
• Time in Patent Office: 826 Days
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

Disclosed are a method, device and system for transmitting a Multi-user Multiple-Input-Multiple-Output (MU-MIMO) pilot and data. The method includes: when at least two terminals transmit a MU-MIMO pilot and data on one same time/frequency resource, constructing a k-stream SU-MIMO pilot and data; based on the configuration mode of the k-stream SU-MIMO pilot, modifying demodulation pilot port parameters of the at least two terminals; and based on the transmission mode of the k-stream SU-MIMO pilot and data, transmitting the k-stream SU-MIMO pilot and data to the at least two terminals, respectively. Further disclosed are a device and system for transmitting a MU-MIMO pilot and data.

Claims

1. A method for transmitting Multi-User Multiple-Input-Multiple-Output (MU-MIMO) pilot and data, comprising:

constructing, by a construction module of an apparatus for transmitting the MU-MIMO pilot and data, k streams of Single-User Multiple-Input-Multiple-Output (SU-MIMO) pilot and data when at least two terminals perform transmission of the MU-MIMO pilot and data on a same time and frequency resource;

modifying, by a modifying module of the apparatus, parameters of demodulation pilot ports of the at least two terminals according to the k streams of the SU-MIMO pilot; and

transmitting, by a transmitting module of the apparatus, the k streams of the SU-MIMO pilot and data to the at least two terminals,

wherein the at least two terminals comprise a first terminal and a second terminal, the first terminal performs transmission of L₁ streams of the MU-MIMO pilot and data and the second terminal performs transmission of L₂ streams of the MU-MIMO pilot and data, wherein

2. The method according to claim 1, wherein the L₁ streams of the MU-MIMO pilot and data of the first terminal correspond to L₁ weight values, and the L₁ streams of the MU-MIMO data of the first terminal correspond to p codewords;

the L₂ streams of the MU-MIMO pilot and data of the second terminal correspond to L₂ weight values, and the L₂ streams of the MU-MIMO data of the second terminal correspond to q codewords,

wherein the L₁ weight values and the L₂ weight values are configured to be synthesized into a weight value matrix of SU-MIMO, and the p codewords and the q codewords are configured to be synthesized into the SU-MIMO data;

wherein constructing the k streams of the SU-MIMO pilot and data further comprises;

combining, by a weight value synthesizing unit of the constructing module, the L₁ weight values corresponding to the L₁ streams of the MU-MIMO pilot and data of the first terminal and the L₂ weight values corresponding to the L₂ streams of the MU-MIMO pilot and data of the second terminal in sequence, to obtain k weight values corresponding to the k streams of the SU-MIMO pilot and data;

taking, by a codeword synthesizing unit of the constructing module, any one of the p codewords corresponding to the L₁ streams of the MU-MIMO data of the first terminal as a first codeword of at least two codewords corresponding to the k streams of the SU-MIMO data, and taking any one of the q codewords corresponding to the L₂ streams of the MU-MIMO data of the second terminal as a second codeword of the at least two codewords corresponding to the k streams of the SU-MIMO data; and

mapping, by a data mapping unit of the constructing module, the first codeword to the L₁ streams of the MU-MIMO data, and mapping the second codeword to the L₂ streams of the MU-MIMO data.

3. The method according to claim 2, wherein transmitting the k streams of the SU-MIMO pilot and data to the at least two terminals further comprises:

mapping, by a first mapping unit of the transmitting module, a first codeword of at least two codewords corresponding to the k streams of the SU-MIMO data to a layer of the first terminal; and

mapping, by a second mapping unit of the transmitting module, the layer of the first terminal to the demodulation pilot port.

4. The method according to claim 2, wherein transmitting the k streams of the SU-MIMO pilot and data to the at least two terminals further comprises:

mapping, by a first mapping unit of the transmitting module, a second codeword of at least two codewords corresponding to the k streams of the SU-MIMO data to a layer of the second terminal; and

mapping, by a second mapping unit of the transmitting module, the layer of the second terminal to the demodulation pilot port.

5. The method according to claim 2, wherein after transmitting the k streams of the SU-MIMO pilot and data to the at least two terminals, the method further comprises:

determining, by a determining module of the apparatus, when it is received a wrong check result fed back by the first terminal after the first terminal detects and decodes the codewords corresponding to the k streams of the SU-MIMO data, whether a codeword resulting in the wrong check result is an invalid codeword; and

when the codeword resulting in the wrong check result is an invalid codeword, performing, by the transmitting module no retransmission;

otherwise, retransmitting, by the transmitting module, data corresponding to the codeword resulting in the wrong check result to the first terminal.

6. The method according to claim 2, wherein after transmitting the k streams of the SU-MIMO pilot and data to the at least two terminals, the method further comprises:

determining, by a determining module of the apparatus, when it is received a wrong check result fed back by the second terminal after the second terminal detects and decodes the codewords corresponding to the k streams of the SU-MIMO data, whether a codeword resulting in the wrong check result is an invalid codeword; and

when the codeword resulting in the wrong check result is an invalid codeword, performing, by the transmitting module no retransmission;

otherwise, retransmitting, by the transmitting module, data corresponding to the codeword resulting in the wrong check result to the second terminal.

7. The method according to claim 1, wherein the L₁ streams of the MU-MIMO pilot and data of the first terminal correspond to L₁ weight values, and the L₁ streams of the MU-MIMO data of the first terminal correspond to p codewords;

the L₂ streams of the MU-MIMO pilot and data of the second terminal correspond to L₂ weight values, and the L₂ streams of the MU-MIMO data of the second terminal correspond to q codewords,

wherein the L₁ weight values and the L₂ weight values are configured to be synthesized into a weight value matrix of SU-MIMO, and the p codewords and the q codewords are configured to be synthesized into the SU-MIMO data;

wherein constructing the k streams of the SU-MIMO pilot and data further comprises;

combining, by a weight value synthesizing unit of the constructing module, the L₁ weight values corresponding to the L₁ streams of the MU-MIMO pilot and data of the first terminal and the L₂ weight values corresponding to the L₂ streams of the MU-MIMO pilot and data of the second terminal in sequence, to obtain k weight values corresponding to the k streams of the SU-MIMO pilot and data;

taking, by a codeword synthesizing unit of the constructing module, a combination of the p codewords corresponding to the L₁ streams of the MU-MIMO data of the first terminal as a first codeword of at least two codewords corresponding to the k streams of the SU-MIMO data, and taking a combination of the q codewords corresponding to the L₂ streams of the MU-MIMO data of the second terminal as a second codeword of the at least two codewords corresponding to the k streams of the SU-MIMO data; and

mapping, by a data mapping unit of the constructing module, the first codeword to the L₁ streams of the MU-MIMO data, and mapping the second codeword to the L₂ streams of the MU-MIMO data.

8. The method according to claim 1, wherein modifying the parameters of the demodulation pilot ports of the at least two terminals further comprises:

modifying, by a modifying unit of the modifying module, a quantity of layers RI of the first terminal to be RI=k and notifying the first terminal of the modification, wherein the quantity of layers RI is the quantity of layers or streams of spatial multiplexing when the first terminal performs data transmission;

additionally setting, by a setting unit of the modifying module, L₂ virtual demodulation pilot ports for the first terminal, wherein the L₂ virtual demodulation pilot ports correspond to the L₂ streams of the MU-MIMO pilot of the second terminal; and

configuring, by a configuring unit of the modifying module, Scrambling identity (SCID) values of the demodulation pilot ports on the same time and frequency resource to be 0 or configuring the SCID values of the demodulation pilot ports on the same time and frequency resource to be 1.

9. The method according to claim 1, wherein modifying the parameters of the demodulation pilot ports further comprises:

modifying, by the modifying unit, the quantity of layers RI′

of the second terminal to be RI′

=k and notifying the second terminal of the modification, wherein the quantity of layers RI′

is the quantity of layers or streams of spatial multiplexing when the second terminal performs data transmission;

additionally setting, by the setting unit, L₁ virtual demodulation pilot ports for the second terminal, wherein the L₁ virtual demodulation pilot ports correspond to the L₁ streams of the MU-MIMO pilot and data of the first terminal; and

configuring, by the configuring unit, Scrambling identity (SCID) values of the demodulation pilot ports on the same time and frequency resource to be 0 or configuring the SCID values of the demodulation pilot ports on the same time and frequency resource to be 1.

10. A method for receiving Multi-User Multiple-Input-Multiple-Output (MU-MIMO) pilot and data, comprising:

receiving, by a receiving module of a terminal, k streams of Single-User Multiple-Input-Multiple-Output (SU-MIMO) pilot and data constructed;

detecting, by a detecting module of the terminal, energy of demodulation pilot ports corresponding to at least two codewords corresponding to the k streams of the SU-MIMO data;

comparing, by a comparing module of the terminal, the energy of the demodulation pilot ports, to determine an invalid codeword; and

feeding back, by a feedback module of the terminal, a check result being 0 or 1 for the invalid codeword;

wherein the k streams of the SU-MIMO pilot and data are constructed based on L_i streams of MU-MIMO pilot and data of at least two terminals for receiving the MU-MIMO pilot and data,

11. An apparatus for transmitting Multi-User Multiple-Input-Multiple-Output (MU-MIMO) pilot and data, comprising:

one or more processors; and

a memory storing program instructions which, when executed by the one or more processors, configure the apparatus to;

construct k streams of Single-User Multiple-Input-Multiple-Output (SU-MIMO) pilot and data when at least two terminals perform transmission of the MU-MIMO pilot and data on a same time and frequency resource;

modify parameters of demodulation pilot ports of the at least two terminals according to the k streams of the SU-MIMO pilot; and

transmit the k streams of the SU-MIMO pilot and data to the at least two terminals,

wherein the at least two terminals comprise a first terminal and a second terminal, the first terminal performs transmission of L₁ streams of the MU-MIMO pilot and data and the second terminal performs transmission of L₂ streams of the MU-MIMO pilot and data, wherein

12. The apparatus according to claim 11, wherein the L₁ streams of the MU-MIMO pilot and data of the first terminal correspond to L₁ weight values, and the L₁ streams of the MU-MIMO data of the first terminal correspond to p codewords;

the L₂ streams of the MU-MIMO pilot and data of the second terminal correspond to L₂ weight values, and the L₂ streams of the MU-MIMO data of the second terminal correspond to q codewords;

wherein the L₁ weight values and the L₂ weight values are configured to be synthesized into a weight value matrix of SU-MIMO, and the p codewords and the q codewords are configured to be synthesized into the SU-MIMO data;

wherein constructing the k streams of the SU-MIMO pilot and data comprises;

combine the L₁ weight values corresponding to the L₁ streams of the MU-MIMO pilot and data of the first terminal and the L₂ weight values corresponding to the L₂ streams of the MU-MIMO pilot and data of the second terminal in sequence, to obtain k weight values corresponding to the k streams of the SU-MIMO pilot and data;

take any one of the p codewords corresponding to the L₁ streams of the MU-MIMO data of the first terminal as a first codeword of at least two codewords corresponding to the k streams of the SU-MIMO data, and take any one of the q codewords corresponding to the L₂ streams of the MU-MIMO data of the second terminal as a second codeword of the at least two codewords corresponding to the k streams of the SU-MIMO data; and

map the first codeword to the L₁ streams of the MU-MIMO data, and map the second codeword to the L₂ streams of the MU-MIMO data.

13. The apparatus according to claim 12, wherein transmitting the k streams of the SU-MIMO pilot and data to the at least two terminals comprises:

map a first codeword of at least two codewords corresponding to the k streams of the SU-MIMO data to a layer of the first terminal; and

map the layer of the first terminal to the demodulation pilot port.

14. The apparatus according to claim 12, wherein transmitting the k streams of the SU-MIMO pilot and data to the at least two terminals comprises:

map a second codeword of at least two codewords corresponding to the k streams of the SU-MIMO data to a layer of the second terminal; and

map the layer of the second terminal to the demodulation pilot port.

15. The apparatus according to claim 12 wherein the apparatus is further configured to:

determine, when it is received a wrong check result fed back by the first terminal after the first terminal detects and decodes the codewords corresponding to the k streams of the SU-MIMO data, whether a codeword resulting in the wrong check result is an invalid codeword; and

perform no retransmission when the codeword resulting in the wrong check result is an invalid codeword; and

otherwise, retransmit data corresponding to the codeword resulting in the wrong check result to the first terminal.

16. The apparatus according to claim 11, wherein constructing the k streams of the SU-MIMO pilot and data comprises:

take a combination of the p codewords corresponding to the L₁ streams of the MU-MIMO data of the first terminal as a first codeword of at least two codewords corresponding to the k streams of the SU-MIMO data, and take a combination of the q codewords corresponding to the L₂ streams of the MU-MIMO data of the second terminal as a second codeword of the at least two codewords corresponding to the k streams of the SU-MIMO data.

17. The apparatus according to claim 11, wherein modifying the parameters of the demodulation pilot ports of the at least two terminals comprises:

modify a quantity of layers RI of the first terminal to be RI=k and notifying the first terminal of the modification, wherein the quantity of layers RI is the quantity of layers or streams of spatial multiplexing when the first terminal performs data transmission;

additionally set L₂ virtual demodulation pilot ports for the first terminal, wherein the L₂ virtual demodulation pilot ports correspond to the L₂ streams of the MU-MIMO pilot of the second terminal; and

configure Scrambling identity (SCID) values of the demodulation pilot ports on the same time and frequency resource to be 0 or configure the SCID values of the demodulation pilot ports on the same time and frequency resource to be 1.

18. The apparatus according to claim 11, wherein modifying the parameters of the demodulation pilot ports of the at least two terminals comprises:

modify the quantity of layers RI′

of the second terminal to be RI′

=k and notifying the second terminal of the modification, wherein the quantity of layers RI′

is the quantity of layers or streams of spatial multiplexing when the second terminal performs data transmission; and

additionally set L₁ virtual demodulation pilot ports for the second terminal, wherein the L₁ virtual demodulation pilot ports correspond to the L₁ streams of the MU-MIMO pilot of the first terminal.

19. A terminal for receiving Multi-User Multiple-Input-Multiple-Output (MU-MIMO) pilot and data, comprising:

one or more processors; and

a memory storing program instructions which, when executed by the one or more processors, configured the terminal to;

receive k streams of Single-User Multiple-Input-Multiple-Output (SU-MIMO) pilot and data constructed;

energy of demodulation pilot ports corresponding to at least two codewords corresponding to the k streams of the SU-MIMO data;

compare the energy of the demodulation pilot ports to determine an invalid codeword; and

feed back a check result being 0 or 1 for the invalid codeword;

wherein the k streams of the SU-MIMO pilot and data are constructed based on L_i streams of MU-MIMO pilot and data of at least two terminals for receiving the MU-MIMO pilot and data,

20. A system for Multi-User Multiple-Input-Multiple-Output (MU-MIMO) pilot and data transmission, wherein the system for MU-MIMO pilot and data transmission comprises an apparatus for transmitting MU-MIMO pilot and data and at least two terminals for receiving the MU-MIMO pilot and data which perform pilot and data transmission with the apparatus for transmitting the MU-MIMO pilot and data,

wherein the apparatus for transmitting MU-MIMO pilot and data comprises:

one or more processors; and

a memory storing program instructions which, when executed by the one or more processors, configure the apparatus to;

construct k streams of Single-User Multiple-Input-Multiple-Output (SU-MIMO) pilot and data in a case that at least two terminals perform transmission of the MU-MIMO pilot and data on a same time and frequency resource;

modify parameters of demodulation pilot ports of the at least two terminals according to the k streams of the SU-MIMO pilot; and

transmit the k streams of the SU-MIMO pilot and data to the at least two terminals,

wherein the at least two terminals comprise a first terminal and a second terminal, the first terminal performs transmission of L₁ streams of the MU-MIMO pilot and data and the second terminal performs transmission of L₂ streams of the MU-MIMO pilot and data, wherein the k streams of the SU-MIMO pilot and data are constructed based on L_i streams of MU-MIMO pilot and data of at least two terminals for receiving MU-MIMO pilot and data,