# US 12,764,502 B2 · System information transmission method and apparatus

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- Number: US 12,764,502 B2
- Document ID: US12764502B2
- Status: Granted
- Kind: B2
- Application number: 18/504,881
- Filed: 2023-11-08
- Published: 2024-03-07
- Granted: 2026-10-13
- Earliest claimed: 2021-05-09
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Xiaodan Pan; Yunlong Gao; Wenjie Peng
- Web page: https://patentgrep.com/patent/US12764502B2

## CPC

- H04W 4/06: Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
- H04W 48/10: using broadcasted information
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

This application provides a system information (SI) transmission method and apparatus. The method includes: The first terminal device receives a first request message sent by the one or more second terminal devices. The first request message is used to request to obtain M system information blocks (SIBs) or system information (SI) messages of a serving cell. The first terminal device determines N destination identifiers corresponding to the M SIBs or SI messages, where N is an integer greater than or equal to 1, and N≤M. The first terminal device sends, based on the N destination identifiers, the M SIBs or SI messages to the one or more second terminal devices in a broadcast or multicast manner. According to the method, the SI may be transmitted on an SL in the multicast or broadcast manner. This improves SI transmission efficiency and SI update efficiency.

## Claims

### Claim 1

An information transmission method performed by a first terminal device in a system comprising the first terminal device and one or more second terminal devices, the first terminal device establishes a sidelink (SL) connection to each second terminal device, each second terminal device obtains a network service of a target cell through the first terminal device, the target cell is a serving cell of the first terminal device, wherein the method comprises:
receiving, by the first terminal device, a first request message from one or more second terminal devices, wherein the first request message is used to request to obtain M system information blocks (SIBs) or system information (SI) messages of a target cell, wherein M is an integer;
determining, by the first terminal device, N destination identifiers corresponding to the M SIBs or SI messages, wherein N is an integer greater than or equal to 1, and N≤M, and wherein determining by the first terminal device, N destination identifiers corresponding to the M SIBs or SI messages comprises:
after receiving the first request message, parsing content of the first request message to determine the M SIBs or SI messages required by all of the one or more second terminal devices;
then determining, by the first terminal device, that each of the M SIBs or SI messages corresponds to a different destination identifier, wherein the different destination identifier indicates to send the M SIBs or SI messages in a multicast manner; or
then determining, by the first terminal device, that K SIBs or SI messages of the M SIBs or SI messages correspond to one same destination identifier, wherein 1≤K<M, and the destination identifier indicates to send the M SIBs or SI messages in the multicast manner; and
sending, by the first terminal device, a second message to the one or more second terminal devices in the multicast manner, wherein the second message comprises the M SIBs or SI messages, and the second message comprises the corresponding destination identifiers.

### Claim 2 (depends on 1)

The method according to claim 1, wherein based on the M SIBs or SI messages corresponding to a same destination identifier, the destination identifier is a preset identifier.

### Claim 3 (depends on 1)

The method according to claim 1, wherein based on the M SIBs or SI messages corresponding to a same destination identifier, the second message further comprises an identifier of the first terminal device.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the method further comprises:
sending, by the first terminal device, information about a first mapping relationship to the one or more second terminal devices, wherein the first mapping relationship indicates a correspondence between the M SIBs or SI messages and the N destination identifiers.

### Claim 5 (depends on 1)

The method according to claim 1, wherein after the determining, by the first terminal device, N destination identifiers corresponding to the M SIBs or SI messages, the method further comprises:
sending, by the first terminal device to the one or more second terminal devices, information about a destination identifier corresponding to the second message, wherein the destination identifier is determined by the first terminal device based on a first mapping relationship, and the first mapping relationship indicates a correspondence between the M SIBs or SI messages and the N destination identifiers.

### Claim 6

An information transmission method performed by one or more second terminal devices in a system comprising a first terminal device and the one or more second terminal devices, the first terminal device establishes a sidelink (SL) connection to each second terminal device, each second terminal device obtains a network service of a target cell through the first terminal device, the target cell is a serving cell of the first terminal device, wherein the method comprises:
sending, by one or more second terminal devices, a first request message to a first terminal device, wherein the first request message is used to request to obtain M system information blocks (SIBs) or system information (SI) messages of a target cell, wherein M is an integer; and
receiving, by the one or more second terminal devices, a second message sent by the first terminal device in a broadcast or multicast manner, wherein the second message comprises the M SIBs or SI messages, the M SIBs or SI messages correspond to N destination identifiers, the N destination identifiers corresponding to the M SIBs or SI messages determined by parsing content of the first request message to determine the M SIBs or SI messages required by all or some of the one or more second terminal devices, the second message comprises the corresponding destination identifiers, N is an integer greater than or equal to 1, and N≤M, and wherein:
each of the M SIBs or SI messages corresponds to a different destination identifier, and the different destination identifier indicates the first terminal device to send the M SIBs or SI messages in the multicast manner; or
K SIBs or SI messages of the M SIBs or SI messages correspond to one same destination identifier, 1≤K<M, and the one same destination identifier indicates the first terminal device to send the M SIBs or SI messages in the multicast manner.

### Claim 7 (depends on 6)

The method according to claim 6, wherein based on the M SIBs or SI messages corresponding to a same destination identifier, the destination identifier is a preset identifier.

### Claim 8 (depends on 6)

The method according to claim 6, wherein based on the M SIBs or SI messages correspond to a same destination identifier, the second message further comprises an identifier of the first terminal device, and the method further comprises:
receiving, by the one or more second terminal devices, the second message that comprises the identifier of the first terminal device and is sent by the first terminal device; and
obtaining, based on the second message, a corresponding SIB or SI message.

### Claim 9 (depends on 6)

The method according to claim 6, wherein the method further comprises:
receiving, by the one or more second terminal devices, information about a first mapping relationship that is sent by the first terminal device, wherein the first mapping relationship indicates a correspondence between the M SIBs or SI messages and the N destination identifiers;
determining, by the one or more second terminal devices based on the information about the first mapping relationship, a destination identifier used for receiving the second message sent by the first terminal device;
receiving, by the one or more second terminal devices, the second message that comprises the destination identifier and that is sent by the first terminal device; and
obtaining, based on the second message, a corresponding SIB or SI message.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the method further comprises:
based on the first mapping relationship changing, receiving, by the one or more second terminal devices, information about an updated first mapping relationship that is sent by the first terminal device; and/or
based on a third terminal device accessing the first terminal device, sending, by the first terminal device, the information about the first mapping relationship to the third terminal device.

### Claim 11 (depends on 6)

The method according to claim 6, wherein the method further comprises:
receiving, by the one or more second terminal devices, information about a destination identifier corresponding to the second message that is sent by the first terminal device, wherein the destination identifier is determined by the first terminal device based on a first mapping relationship, and the first mapping relationship indicates a correspondence between the M SIBs or SI messages and the N destination identifiers.

### Claim 12

An apparatus, comprising:
at least one processor; and
a memory storing programming, the programming including instructions that, when executed by the at least one processor, cause the apparatus to perform:
receiving a first request message from one or more second terminal devices, wherein the first request message is used to request to obtain M system information blocks (SIBs) or system information (SI) messages of a target cell, wherein M is an integer;
determining N destination identifiers corresponding to the M SIBs or SI messages, wherein N is an integer greater than or equal to 1, and N≤M, and wherein determining by the first terminal device, N destination identifiers corresponding to the M SIBs or SI messages comprises:
after receiving the first request message, parsing content of the first request message to determine the M SIBs or SI messages required by all of the one or more second terminal devices;
then determining, by the first terminal device, that each of the M SIBs or SI messages corresponds to a different destination identifier, wherein the different destination identifier indicates to send the M SIBs or SI messages in a multicast manner; or
then determining, by the first terminal device, that K SIBs or SI messages of the M SIBs or SI messages correspond to one same destination identifier, wherein 1≤K<M, and the destination identifier indicates to send the M SIBs or SI messages in the multicast manner; and
sending a second message to the one or more second terminal devices in the multicast manner, wherein the second message comprises the M SIBs or SI messages, and the second message comprises the corresponding destination identifiers.

### Claim 13 (depends on 12)

The apparatus according to claim 12, wherein based on the M SIBs or SI messages correspond to a same destination identifier, the destination identifier is a preset identifier.

### Claim 14 (depends on 12)

The apparatus according to claim 12, wherein based on the M SIBs or SI messages corresponding to a same destination identifier, the second message further comprises an identifier of the apparatus.

### Claim 15 (depends on 12)

The apparatus according to claim 12, wherein the instructions, when executed by the at least one processor, cause the apparatus further to perform:
sending information about a first mapping relationship to the one or more second terminal devices, wherein the first mapping relationship indicates a correspondence between the M SIBs or SI messages and the N destination identifiers.

### Claim 16 (depends on 12)

The apparatus according to claim 12, wherein the instructions, when executed by the at least one processor, cause the apparatus further to perform:
sending to the one or more second terminal devices, information about a destination identifier corresponding to the second message, wherein the destination identifier is determined by the first terminal device based on a first mapping relationship, and the first mapping relationship indicates a correspondence between the M SIBs or SI messages and the N destination identifiers.