Demodulation reference signal indicating and receiving methods, transmit end, and receive end

Patent metadata

Field	Value
Publication number	US-11424898-B2
Application number	US-202016917139-A
Country	US
Kind code	B2
Filing date	Jun 30, 2020
Priority date	Aug 11, 2017
Publication date	Aug 23, 2022
Grant date	Aug 23, 2022

Abstract

This application discloses a DMRS indicating method, a DMRS receiving method, and an apparatus. The method includes: determining, by a transmit end from a plurality of groups of demodulation reference signal DMRS configuration information, DMRS configuration information corresponding to a current DMRS transmission scheme, and obtaining DMRS indication information based on the DMRS configuration information, where each group of DMRS configuration information includes a plurality of pieces of DMRS configuration information; and sending, by the transmit end, the DMRS indication information. The method and the apparatus provided in this application are implemented to match a plurality of scenarios in NR. This can satisfy a requirement for transmitting more layers of data, and can further reduce indication overheads.

First claim

What is claimed is:

1. A demodulation reference signal (DMRS) indicating method carried out by a network device, the method comprising:
obtaining, by a network device, a DMRS indication information that indicates a code division multiplexing (CDM) group information of an antenna port,
wherein the CDM group information comprises a number of CDM groups; and
wherein the number of CDM groups is a number of CDM groups that have a possibility of being co-scheduled and that are not used for transmitting data; and
wherein:
a value of the number of CDM groups being 1 indicates that a CDM group 1 is co-scheduled;
a value of the number of CDM groups being 2 indicates that a CDM group 1 and a CDM group 2 are co-scheduled; and

a value of the number of CDM groups being 3 indicates that a CDM group 1, a CDM group 2, and a CDM group 3 are co-scheduled; and
sending, by the network device, the DMRS indication information.

2. The method according to claim 1 , wherein a DMRS configuration information corresponding to a current DMRS transmission scheme is determined from a plurality of groups of DMRS configuration information, and the DMRS indication information is obtained based on the DMRS configuration information, wherein each group of DMRS configuration information comprises a plurality of pieces of DMRS configuration information.

3. The method according to claim 2 , wherein in the DMRS configuration information, specific DMRS port mapping rules of a DMRS type 1 and a DMRS type 2 are as follows:
for a 1-symbol DMRS type 1, ports comprised in a CDM group 1 are {0, 1}, and ports comprised in a CDM group 2 are {2, 3};
for a 2-symbol DMRS type 1, ports comprised in the CDM group 1 are {0, 1, 4, 5}, and ports comprised in the CDM group 2 are {2, 3, 6, 7};
for a 1-symbol DMRS type 2, ports comprised in the CDM group 1 are {0, 1}, ports comprised in the CDM group 2 are {2, 3}, and ports comprised in the CDM group 3 are {4, 5}; and
for a 2-symbol DMRS type 2, ports comprised in the CDM group 1 are {0, 1, 6, 7}, ports comprised in the CDM group 2 are {2, 3, 8, 9}, and ports comprised in the CDM group 3 are {4, 5, 10, 11}.

4. The method according to claim 3 , wherein in the DMRS configuration information corresponding to the DMRS type 1, a correspondence between a number of CDM groups, a port, and a number of symbols satisfies a correspondence shown by one or more rows in the following table:

One Codeword (≤4 Layers)
Two Codewords (>4 Layers)

RMI

RMI

(number of

number

(number of

number

co-scheduled
UE

of
Value
co-scheduled
UE

of

Value
CDM groups)
Rank
Port
symbols
(value)
CDM groups)
Rank
ports
symbols

0
1
1
0
1
0
Reserved
reserved
reserved
1

1
1
1
1
1
1
Reserved
reserved
reserved
1

2
1
2
0, 1
1
2
Reserved
reserved
reserved
1

3
2
1
0
1
3
Reserved
reserved
reserved
1

4
2
1
1
1
4
Reserved
reserved
reserved
1

5
2
1
2
1
5
Reserved
reserved
reserved
1

6
2
1
3
1
6
Reserved
reserved
reserved
1

7
2
2
0, 1
1
7
Reserved
reserved
reserved
1

8
2
2
2, 3
1
8
Reserved
reserved
reserved
1

9
2
3
0-2
1
9
Reserved
reserved
reserved
1

10
2
4
0-3
1
10
Reserved
reserved
reserved
1

11
1
1
0
2
11
2
5
0-2, 4, 5
2

12
1
1
1
2
12
2
6
0-5
2

13
1
1
4
2
13
2
7
0-6
2

14
1
1
5
2
14

Assignees

• Huawei Tech Co Ltd

Inventors

• Ren Xiang
• Liu Yong
• Rong Lu

Classifications

• H04L5/0008 Primary

  Wavelet-division · CPC title

• H04L5/0091

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

• H04L27/261 Primary

  Details of reference signals · CPC title

• H04L5/0021

  in which codes are applied as a frequency-domain sequences, e.g. MC-CDMA · CPC title

• H04L5/0048 Primary

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title