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

Patent metadata

Field	Value
Publication number	US-12301518-B2
Application number	US-202217876301-A
Country	US
Kind code	B2
Filing date	Jul 28, 2022
Priority date	Aug 11, 2017
Publication date	May 13, 2025
Grant date	May 13, 2025

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 comprising:
obtaining, by a transmit end, DMRS indication information based on DMRS configuration information, wherein the DMRS indication information indicates code division multiplexing (CDM) group information of an antenna port, and wherein the CDM group information comprises a number of CDM groups; and
sending, by the transmit end, the DMRS indication information;
wherein frequency division multiplexing (FDM) is performed, for a 2-symbol DMRS type 2 and in accordance with single-user (SU) scheduling being performed by using the DMRS configuration information, in a CDM group 1 and a CDM group 2;
wherein in the DMRS configuration information, specific DMRS port mapping rules of a DMRS type 2 are applied as follows:
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 a CDM group 3 are {4, 5, 10, 11}; and

wherein the frequency division multiplexing (FDM) is performed in the CDM group 1 and the CDM group 2 as follows:
in accordance with a value of the number of CDM groups being 2 and six transmission layers or six DMRS ports being scheduled, FDM multiplexing is performed as follows:
in DMRS ports 0, 1, 6, and 7 corresponding to the CDM group 1, the DMRS ports 0, 1, and 6 are scheduled; and
in DMRS ports 2, 3, 8, and 9 corresponding to the CDM group 2, the DMRS ports 2, 3, and 8 are scheduled; or

in accordance with a value of the number of CDM groups being 2 and eight transmission layers or eight DMRS ports being scheduled, FDM multiplexing is performed as follows:
in DMRS ports 0, 1, 6, and 7 corresponding to the CDM group 1, the DMRS ports 0, 1, 6, and 7 are scheduled; and
in DMRS ports 2, 3, 8, and 9 corresponding to the CDM group 2, the DMRS ports 2, 3, 8, and 9 are scheduled.

2. The method according to claim 1 , wherein the number of CDM groups is a number of CDM groups that have a possibility, for a given configuration, of being scheduled in a system and that are not used for transmitting data.

3. The method according to claim 2 , wherein:
a value of the number of CDM groups of 1 indicates that a CDM group 1 is occupied or co-scheduled;
a value of the number of CDM groups of 2 indicates that a CDM group 1 and a CDM group 2 are occupied or co-scheduled; and
a value of the number of CDM groups is 3, it indicates that a CDM group 1, a CDM group 2, and a CDM group 3 are occupied or co-scheduled.

4. A demodulation reference signal (DMRS) receiving method, comprising:
receiving, by a receive end, DMRS indication information sent by a transmit end, wherein the DMRS indication information indicates code division multiplexing (CDM) group information of an antenna port, and wherein the CDM group information comprises a number of CDM groups; and
assisting, by the receive end, in demodulating data based on the received DMRS indication information,
wherein frequency division multiplexing (FDM) is performed, for a 2-symbol DMRS type 2 and in accordance with single-(SU) scheduling being performed by using the DMRS configuration information, in a CDM group 1 and a CDM group 2;
wherein in the DMRS configuration information, specific DMRS port mapping rules of a DMRS type 2 are applied as follows:
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 a CDM group 3 are {4, 5, 10, 11}; and

wherein the frequency division multiplexing (FDM) is performed in the CDM group 1 and the CDM group 2, as follows:
in accordance with a value of the number of CDM groups being 2 and six transmission layers or six DMRS ports being scheduled, FDM multiplexing is performed as follows:
in DMRS ports 0, 1, 6, and 7 corresponding to the CDM group 1, the DMRS ports 0, 1, and 6 are scheduled; and
in DMRS ports 2, 3, 8, and 9 corresponding to the CDM group 2, the DMRS ports 2, 3, and 8 are scheduled; or

in accordance with a value of the number of CDM groups being 2 and eight transmission layers or eight DMRS ports being scheduled, FDM multiplexing is performed as follows:
in DMRS ports 0, 1, 6, and 7 corresponding to the CDM group 1, the DMRS ports 0, 1, 6, and 7 are scheduled; and
in DMRS ports 2, 3, 8, and 9 corresponding to the CDM group 2, the DMRS ports 2, 3, 8, and 9 are scheduled.

5. The method according to claim 4 , wherein the number of CDM groups is a number of CDM groups that have a possibility, for a given configuration, of being scheduled in a system and that are not used for transmitting data.

6. The method according to claim 5 , wherein:
a value of the number of CDM groups of 1 indicates that a CDM group 1 is occupied or co-scheduled;
a value of the number of CDM groups of 2 indicates that a CDM group 1 and a CDM group 2 are occupied or co-scheduled; and
a value of the number of CDM groups is 3, it indicates that a CDM group 1, a CDM group 2, and a CDM group 3 are occupied or co-scheduled.

7. A transmit end, comprising:
a processor; and
a non-transitory computer-readable medium including computer-executable instructions that, when executed by the processor, facilitate performing a demodulation reference signal (DMRS) indicating method comprising:
obtaining DMRS indication information based on DMRS configuration information, wherein the DMRS indication information indicates code division multiplexing (CDM) group information of an antenna port, and wherein the CDM group information comprises a number of CDM groups; and
sending the DMRS indication information;
wherein in the DMRS configuration information, specific DMRS port mapping rules of a DMRS type 2 are applied as follows:
ports comprised in a CDM group 1 are {0, 1, 6, 7},
ports comprised in a CDM group 2 are {2, 3, 8, 9}, and
ports comprised in a CDM group 3 are {4, 5, 10, 11};

wherein frequency division multiplexing (FDM) is performed, for a 2-symbol DMRS type 2 and in accordance with single-user (SU) scheduling being performed by using the DMRS configuration information, in the CDM group 1 and the CDM group 2;
wherein the frequency division multiplexing (FDM) is performed in the CDM group 1 and the CDM group 2, as follows:
in accordance with a value of the number of CDM groups being 2 and six transmission layers or six DMRS ports being scheduled, FDM multiplexing is performed as follows:
in DMRS ports 0, 1, 6, and 7 corresponding to the CDM group 1, the DMRS ports 0, 1, and 6 are scheduled; and
in DMRS ports 2, 3, 8, and 9 corresponding to the CDM group 2, the DMRS ports 2, 3, and 8 are scheduled; or

in accordance with a value of the number of CDM groups being 2 and eight transmission layers or eight DMRS ports being scheduled, FDM multiplexing is performed as follows:
in DMRS ports 0, 1, 6, and 7 corresponding to the CDM group 1, the DMRS ports 0, 1, 6, and 7 are scheduled; and
in DMRS ports 2, 3, 8, and 9 corresponding to the CDM group 2, the DMRS ports 2, 3, 8, and 9 are scheduled.

8. The transmit end according to claim 7 , wherein the number of CDM groups is a number of CDM groups that have a possibility, for a given configuration, of being scheduled in a system and that are not used for transmitting data.

9. The transmit end according to claim 8 , wherein:
a value of the number of CDM groups of 1 indicates that a CDM group 1 is occupied or co-scheduled;
a value of the number of CDM groups of 2 indicates that a CDM group 1 and a CDM group 2 are occupied or co-scheduled; and
a value of the number of CDM groups is 3, it indicates that a CDM group 1, a CDM group 2, and a CDM group 3 are occupied or co-scheduled.

10. A receive end, comprising:
a processor; and
a non-tr

Assignees

• Huawei Tech Co Ltd

Inventors

• Ren Xiang
• Liu Yong
• Rong Lu

Classifications

• H04L5/026

  using code division (code allocation applied as frequency-domain sequences H04L5/0021) · CPC title

• H04L5/0051

  of dedicated pilots, i.e. pilots destined for a single user or terminal · CPC title

• H04W76/27

  Transitions between radio resource control [RRC] states · CPC title

• H04L5/0092

  Indication of how the channel is divided · CPC title

• H04L5/0008 Primary

  Wavelet-division · CPC title