DMRS indication method and system, base station and user equipment

Patent metadata

Field	Value
Publication number	US-10715293-B2
Application number	US-201615752457-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Aug 19, 2015
Publication date	Jul 14, 2020
Grant date	Jul 14, 2020

Abstract

A demodulation reference signal (DMRS) indication method includes: a base station allocating designated DMRS ports, numbers of layers and orthogonal cover code (OCC) lengths to a user equipment (UE) according to a DMRS configuration parameter indication table, wherein a plurality of DMRS configuration parameter indication entries with a plurality of OCC length combinations of at least two OCC lengths are recorded in the DMRS configuration parameter indication table; according to DMRS configuration parameter information allocated to the UE, generating corresponding DMRS indication information, and sending the DMRS indication information to a corresponding UE. Also disclosed are a base station, a UE and a DMRS indication system.

First claim

The invention claimed is:

1. A method for indicating a De Modulation Reference Signal (DMRS), applying to a Base Station (BS), the method comprising:
allocating a designated DMRS port, a number of layers, and a length of Orthogonal Cover Codes (OCC) according to a table of DMRS configuration parameters, wherein the table of DMRS configuration parameters comprises entries indicating DMRS configuration parameters of combinations of at least two lengths of OCCs; and
sending a DMRS indication generated corresponding to information on DMRS configuration parameters allocated,
wherein the table of DMRS configuration parameters comprises entries indicating DMRS configuration parameters for one-codeword transmission and entries indicating DMRS configuration parameters for two-codeword transmission,
wherein the entries indicating DMRS configuration parameters for one-codeword transmission comprise four entries indicating DMRS configuration parameters for one-layer transmission with a length of the OCCs of 2, eight entries indicating DMRS configuration parameters for one-layer transmission with a length of the OCCs of 4, three entries indicating DMRS configuration parameters for two-layer to four-layer retransmission with the length of the OCCs of 4, and a reserved entry,
wherein the entries indicating DMRS configuration parameters for two-codeword transmission comprise two entries indicating DMRS configuration parameters for two-layer transmission with the length of the OCCs of 2, four entries indicating DMRS configuration parameters for two-layer transmission with the length of the OCCs of 4, six entries indicating DMRS configuration parameters for Single-User (SU) three-layer to eight-layer transmission with the length of the OCCs of 4, and a reserved entry.

2. The method according to claim 1 , wherein the at least two lengths of OCCs are 2 and 4, respectively.

3. The method according to claim 2 , wherein the DMRS indication is contained in Downlink Control Information (DCI),
wherein the DCI is sent.

4. The method according to claim 2 ,
wherein the length of the OCCs is allocated according to a total number of orthogonal user data flows,
wherein the DMRS configuration parameters are allocated according to allocated OCCs of the allocated length and the table of DMRS configuration parameters.

5. The method according to claim 4 , wherein the length of the OCCs is allocated according to the total number of orthogonal user data flows by:
allocating a length of the allocated OCCs of 2 for a total number of orthogonal user data flows no greater than 2, or
allocating a length of the allocated OCCs of 4 for a total number of orthogonal user data flows greater than 2.

6. The method according to claim 2 ,
wherein a total number of user data flows transmitted is no more than 8,
wherein a number of data flows per user for Multi-User (MU) transmission is no more than 2.

7. The method according to claim 1 , wherein the DMRS indication is of 4 bits.

8. The method according to claim 7 ,
wherein the length of the OCCs is allocated according to a total number of orthogonal user data flows,
wherein the DMRS configuration parameters are allocated according to allocated OCCs of the allocated length and the table of DMRS configuration parameters.

9. The method according to claim 8 , wherein the length of the OCCs is allocated according to the total number of orthogonal user data flows by:
allocating a length of the allocated OCCs of 2 for a total number of orthogonal user data flows no greater than 2, or
allocating a length of the allocated OCCs of 4 for a total number of orthogonal user data flows greater than 2.

10. The method according to claim 7 ,
wherein a total number of user data flows transmitted is no more than 8,
wherein a number of data flows per user for Multi-User (MU) transmission is no more than 2.

11. The method according to claim 1 , further comprising: when allocating the designated DMRS port, the number of layers, and the length of the OCCs,
allocating a designated SCrambling Identity (SCID) according to the table of DMRS configuration parameters.

12. The method according to claim 11 ,
wherein the length of the OCCs is allocated according to a total number of orthogonal user data flows,
wherein the DMRS configuration parameters are allocated according to allocated OCCs of the allocated length and the table of DMRS configuration parameters.

13. The method according to claim 12 , wherein the length of the OCCs is allocated according to the total number of orthogonal user data flows by:
allocating a length of the allocated OCCs of 2 for a total number of orthogonal user data flows no greater than 2, or
allocating a length of the allocated OCCs of 4 for a total number of orthogonal user data flows greater than 2.

14. The method according to claim 11 ,
wherein a total number of user data flows transmitted is no more than 8,
wherein a number of data flows per user for Multi-User (MU) transmission is no more than 2.

15. The method according to claim 1 ,
wherein the length of the OCCs is allocated according to a total number of orthogonal user data flows,
wherein the DMRS configuration parameters are allocated according to allocated OCCs of the allocated length and the table of DMRS configuration parameters.

16. The method according to claim 15 , wherein the length of the OCCs is allocated according to the total number of orthogonal user data flows by:
allocating a length of the allocated OCCs of 2 for a total number of orthogonal user data flows no greater than 2, or
allocating a length of the allocated OCCs of 4 for a total number of orthogonal user data flows greater than 2.

17. The method according to claim 1 ,
wherein a total number of user data flows transmitted is no more than 8,
wherein a number of data flows per user for Multi-User (MU) transmission is no more than 2.

18. The method according to claim 1 ,
wherein for one-codeword transmission, the DMRS configuration parameters allocated are: 1 layer, a port 7, a SCrambling Identity (SCID) 0, and OCC 2; or 1 layer, the port 7, an SCID 1, and OCC 2; or 1 layer, a port 8, the SCID 0, and OCC 2; or 1 layer, the port 8, the SCID 0, and OCC 2; or 1 layer, the port 7, the SCID 0, and OCC 4; or 1 layer, the port 7, the SCID 1, and OCC 4; or 1 layer, the port 8, the SCID 0, and OCC 4; or 1 layer, the port 8, the SCID 1, and OCC 4; or 1 layer, a port 11, the SCID 0, and OCC 4; or 1 layer, the port 11, the SCID 1, and OCC 4; or 1 layer, a port 13, the SCID 0, and OCC 4; or 1 layer, the port 13, the SCID 1, and OCC 4; or 2 layers, the ports 7-8, and OCC 4; or 3 layers, the ports 7-9, and OCC 4; or 4 layers, the ports 7-10, and OCC 4, or
wherein for two-codeword transmission, the DMRS configuration parameters allocated are: 2 layers, the ports 7-8, the SCID 0, and OCC 2; or 2 layers, the ports 7-8, the SCID 1, and OCC 2; or 2 layers, the ports 7-8, the SCID 0, and OCC 4; or 2 layers, the ports 7-8, the SCID 1, and OCC 4; or 2 layers, the ports 11 and 13, the SCID 0, and OCC 4; or 2 layers, the ports 11 and 13, the SCID 1, and OCC 4; or 3 layers, the ports 7-9, and OCC 4; or 4 layers, the ports 7-10, and OCC 4; or 5 layers, the ports 7-11, and OCC 4; or 6 layers, ports 7-12, and OCC 4; or 7 layers, the ports 7-13, and OCC 4; or 8 layers, ports 7-14, and OCC 4,
wherein OCC 2 denotes the length of the OCCs of 2, OCC 4 denotes the length of the OCCs of 4, the SCID 0 denotes an SCID of 0, and the SCID 1 denotes an SCID of 1.

19. A method for indicating a De Mod

Assignees

• China Mobile Communications Group Co Ltd

Inventors

• Jin Jing
• Tong Hui
• Wang Fei
• Wang Qixing

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L27/2613

  Structure of the reference signals · CPC title

• H04L1/16

  in which the return channel carries supervisory signals, e.g. repetition request signals · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04L5/0091

  Signalling for the administration of the divided path, e.g. signalling of configuration information · CPC title