# US 12,004,148 B2 · Transmission configuration indication method of DMRS port and related apparatus, and storage medium

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- Number: US 12,004,148 B2
- Document ID: US12004148B2
- Status: Granted
- Kind: B2
- Application number: 17/600,608
- Filed: 2020-02-07
- Published: 2022-06-23
- Granted: 2024-06-04
- Earliest claimed: 2019-04-04
- Assignees: Datang Mobile Communications Equipment Co., Ltd.
- Applicants: Datang Mobile Communications Equipment Co., Ltd.
- Inventors: Xin Su; Qiubin Gao; Runhua Chen; Mengjun Wang
- Web page: https://patentgrep.com/patent/US12004148B2

## CPC

- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/2613: {Structure of the reference signals}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04L 5/0023: {Time-frequency-space}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Disclosed in the present application are a method for transmission configuration indication (TCI) of a DMRS port and a related apparatus, and a storage medium. In the method, a network side device configures at least two DMRS ports for a terminal according to the correspondence between required TCI states and DMRS CDM groups, the at least two DMRS ports belonging to different CDM groups, and the different CDM groups comprising different numbers of DMRS ports; and sends DCI to the terminal, the DCI comprising a DMRS port index value, the DMRS port index value being an index value pre-defined in a DMRS port allocation table, and the DMRS port index value being used for indicating a DMRS port set allocated to the terminal, the number of CDM groups without data, and the number of preamble DMRS symbols, and being used for indicating the correspondence.

## Claims

### Claim 1

A transmission configuration indication method of a demodulation reference signal (DMRS) port, comprising:
configuring, by a network side device, at least two DMRS ports for a terminal according to a required mapping relationship between transmission configuration indication state information (TCI states) and DMRS code division multiplexing (CDM) groups, wherein the at least two DMRS ports belong to different DMRS CDM groups, and the different DMRS CDM groups comprise different quantities of DMRS ports; and
sending, by the network side device, downlink control information (DCI) to the terminal, wherein the DCI comprises DMRS port index values, the DMRS port index values are index values pre-defined in a DMRS port allocation table, and the DMRS port index values are used to indicate a set of the at least two DMRS ports configured to the terminal, a number of DMRS CDM groups without data, and a number of front-load DMRS symbols, and are used to indicate the mapping relationship between the TCI states and the DMRS CDM groups.

### Claim 2 (depends on 1)

The method according to claim 1, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the first parameter combination correspond to a same mapping relationship between the ICI states and the DMRS CDM groups; or at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, a number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the second parameter combination correspond to a same mapping relationship between the TO states and the DMRS CDM groups.

### Claim 3 (depends on 2)

The method according to claim 2, wherein in the at least two DMRS port index values corresponding to each of the at least one first parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different; and/or
in the at least two DMRS port index values corresponding to each of the at least one second parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different.

### Claim 4 (depends on 1)

The method according to claim 1, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that first parameter combination, between the TCI states and the CDM groups are different; or
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, the number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that second parameter combination, between the TCI states and the CDM groups are different.

### Claim 5 (depends on 4)

The method according to claim 4, wherein port numbers corresponding to the DMRS port index values corresponding to each of the at least one first parameter combination are the same; and/or, port numbers corresponding to the DMRS port index values corresponding to each of the at least one second parameter combination are the same.

### Claim 6

A transmission configuration indication method of a demodulation reference signal (DMRS) port, comprising:
receiving, by a terminal, downlink control information (DCI) sent by a network side device, wherein the DCI comprises DMRS port index values, and the DMRS port index values are index values pre-defined in a DMRS port allocation table; and
determining, by the terminal, a set of DMRS ports, a number of DMRS code division multiplexing (CDM) groups without data, a number of front-load DMRS symbols and a mapping relationship between transmission configuration indication state information (TCI states) and DMRS CDM groups configured by the network side device to the terminal according to the DMRS port index values and the port allocation table, wherein at least two DMRS ports comprised in the set of DMRS ports belong to different DMRS CDM groups, the different DMRS CDM groups comprise different quantities of DMRS ports, and the at least two DMRS ports are determined by the network side device according to a required mapping relationship between the TCI states and the DMRS CDM groups.

### Claim 7 (depends on 6)

The method according to claim 6, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the first parameter combination correspond to a same mapping relationship between the TCI states and the DMRS CDM groups; or
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, a number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the second parameter combination correspond to a same mapping relationship between the TCI states and the DMRS CDM groups.

### Claim 8 (depends on 7)

The method according to claim 7, wherein in the at least two DMRS port index values corresponding to each of the at least one first parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different; and/or
in the at least two DMRS port index values corresponding to each of the at least one second parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different.

### Claim 9 (depends on 6)

The method according to claim 6, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that first parameter combination, between the TCI states and the CDM groups are different; or
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, the number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that second parameter combination, between the TCI states and the CDM groups are different.

### Claim 10 (depends on 9)

The method according to claim 9, wherein port numbers corresponding to the DMRS port index values corresponding to each of the at least one first parameter combination are the same; and/or, port numbers corresponding to the DMRS port index values corresponding to each of the at least one second parameter combination are the same.

### Claim 11

A communication apparatus, comprising: a processor, a memory and a transceiver; wherein
the transceiver is controlled by the processor to receive and send information;
the memory stores computer instructions; and
the processor is configured to read the computer instructions in the memory to:
configure at least two DMRS ports for a terminal according to a required mapping relationship between transmission configuration indication state information (TCI states) and DMRS code division multiplexing (CDM) groups, wherein the at least two DMRS ports belong to different DMRS CDM groups, and the different DMRS CDM groups comprise different quantities of DMRS ports; and
send downlink control information (DCI) to the terminal, wherein the DCI comprises DMRS port index values, the DMRS port index values are index values pre-defined in a DMRS port allocation table, and the DMRS port index values are used to indicate a set of the at least two DMRS ports configured to the terminal, a number of DMRS CDM groups without data, and a number of front-load DMRS symbols, and are used to indicate the mapping relationship between the TCI states and the DMRS CDM groups.

### Claim 12 (depends on 11)

The communication apparatus according to claim 11, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the first parameter combination correspond to a same mapping relationship between the TCI states and the DMRS CDM groups; or
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, a number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the second parameter combination correspond to a same mapping relationship between the TCI states and the DMRS CDM groups.

### Claim 13 (depends on 12)

The communication apparatus according to claim 12, wherein in the at least two DMRS port index values corresponding to each of the at least one first parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different; and/or
in the at least two DMRS port index values corresponding to each of the at least one second parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different.

### Claim 14 (depends on 11)

The communication apparatus according to claim 11, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that first parameter combination, between the TCI states and the CDM groups are different;
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, the number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that second parameter combination, between the TCI states and the CDM groups are different.

### Claim 15 (depends on 14)

The communication apparatus according to claim 14, wherein port numbers corresponding to the DMRS port index values corresponding to each of the at least one first parameter combination are the same; and/or, port numbers corresponding to the DMRS port index values corresponding to each of the at least one second parameter combination are the same.

### Claim 16 (depends on 6)

A communication apparatus, comprising: a processor, a memory and a transceiver; wherein
the transceiver is controlled by the processor to receive and send information;
the memory stores computer instructions; and
the processor is configured to perform the method according to claim 6.

### Claim 17 (depends on 16)

The communication apparatus according to claim 16, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the first parameter combination correspond to a same mapping relationship between the TCI states and the DMRS CDM groups; or
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, a number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, at least two DMRS port index values corresponding to the second parameter combination correspond to a same mapping relationship between the TCI states and the DMRS CDM groups.

### Claim 18 (depends on 17)

The communication apparatus according to claim 17, wherein in the at least two DMRS port index values corresponding to each of the at least one first parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different; and/or
in the at least two Values corresponding to each of the at least one second parameter combination, if the DMRS port index values are different, correspondences between the quantities of DMRS ports contained in the DMRS CDM groups and the DMRS CDM groups are different.

### Claim 19 (depends on 16)

The communication apparatus according to claim 16, wherein at least one first parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 1, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one first parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that first parameter combination, between the TCI states and the CDM groups are different; or
at least one second parameter combination is formed by a DMRS pilot type, a maximum number of front-load DMRS symbols being 2, the number of actually used DMRS symbols, the number of the DMRS CDM groups without data and a total number of DMRS ports; and
for each of the at least one second parameter combination, if a TCI field in the DCI corresponds to at least two TCI states, mapping relationships, corresponding to at least two DMRS port index values corresponding to that second parameter combination, between the TCI states and the CDM groups are different.

### Claim 20 (depends on 19)

The communication apparatus according to claim 19, wherein port numbers corresponding to the DMRS port index values corresponding to each of the at least one first parameter combination are the same; and/or, port numbers corresponding to the DMRS port index values corresponding to each of the at least one second parameter combination are the same.