# US 12,120,758 B2 · Method and apparatus for acquiring system information and paging via UE-to-network relay in a wireless communication system

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- Number: US 12,120,758 B2
- Document ID: US12120758B2
- Status: Granted
- Kind: B2
- Application number: 17/508,327
- Filed: 2021-10-22
- Published: 2022-06-02
- Granted: 2024-10-15
- Earliest claimed: 2020-11-23
- Assignees: ASUSTeK COMPUTER INC.
- Applicants: ASUSTek Computer Inc.
- Inventors: Li-Te Pan
- Web page: https://patentgrep.com/patent/US12120758B2

## CPC

- H04W 12/06: Authentication
- H04W 76/14: Direct-mode setup
- H04W 12/69: Identity-dependent
- H04W 76/11: Allocation or use of connection identifiers
- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 76/30: Connection release
- H04W 88/04: adapted for relaying to or from another terminal or user
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and device are disclosed for a remote User Equipment (UE) to support UE-to-Network relay communication. In one embodiment, the method includes the remote UE connecting with a relay UE. The method also includes the remote UE connecting with a first network node via the relay UE. The method further includes the remote UE receiving a first Radio Resource Control (RRC) message from the first network node via the relay UE, wherein the first RRC message includes a Cell Radio Network Temporary Identifier (C-RNTI) of the remote UE used for constructing authentication information.

## Claims

### Claim 1

A method for a remote User Equipment (UE) to support UE-to-Network relay communication, comprising:
connecting with a relay UE;
establishing a RRC connection between the remote UE and a network via the relay UE;
receiving a Radio Resource Control Release (RRCRelease) message for suspension of the RRC connection from the network via the relay UE, wherein the RRCRelease message includes a Cell Radio Network Temporary Identifier (C-RNTI) of the remote UE, and the C-RNTI of the remote UE is used for generating authentication information to be included in a Radio Resource Control Resume Request (RRCResumeRequest) message or in a Radio Resource Control Resume Request1 (RRCResumeRequest1) message for requesting resumption of the RRC connection; and
transmitting the RRCResumeRequest message or the RRCResumeRequest1 message to the network.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
entering a RRC_CONNECTED if establishment of the RRC connection is completed.

### Claim 3 (depends on 2)

The method of claim 2, further comprising:
entering a RRC_INACTIVE from the RRC_CONNECTED in response to reception of the RRCRelease message from the network via the relay UE.

### Claim 4 (depends on 1)

The method of claim 1, wherein the RRCRelease message includes suspendConfig.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
transmitting the RRCResumeRequest message or the RRCResumeRequest1 message to the network via the relay UE or directly to the network.

### Claim 6 (depends on 5)

The method of claim 5, wherein the network comprises a base station.

### Claim 7 (depends on 1)

The method of claim 1, wherein the authentication information is resumeMAC-I.

### Claim 8

A remote User Equipment (UE) to support UE-to-Network relay communication, comprising:
a control circuit;
a processor installed in the control circuit; and
a memory installed in the control circuit and operatively coupled to the processor;
wherein the processor is configured to execute a program code stored in the memory to:
connect with a relay UE;
establish a RRC connection between the remote UE and a first network node via the relay UE;
receive a first Radio Resource Control Release (RRCRelease) message for suspension of the RRC connection from the network via the relay UE, wherein the RRCRelease message includes a Cell Radio Network Temporary Identifier (C-RNTI) of the remote UE, and the C-RNTI of the remote UE is used for generating authentication information to be included in a Radio Resource Control Resume Request (RRCResumeRequest) message or in a Radio Resource Control Resume Request1 (RRCResumeRequest1) message for requesting resumption of the RRC connection; and
transmit the RRCResumeRequest message or the RRCResumeRequest1 message to the network.

### Claim 9 (depends on 8)

The remote UE of claim 8, further comprising:
entering a RRC_CONNECTED if establishment of the RRC connection is completed.

### Claim 10 (depends on 9)

The remote UE of claim 9, further comprising:
entering a RRC_INACTIVE from the RRC_CONNECTED in response to reception of the RRCRelease message from the network via the relay UE.

### Claim 11 (depends on 8)

The remote UE of claim 8, wherein the RRCRelease message includes suspendConfig.

### Claim 12 (depends on 8)

The remote UE of claim 8, further comprising:
transmitting the RRCResumeRequest message or the RRCResumeRequest1 message to the first network via the relay UE or directly to the network.

### Claim 13 (depends on 12)

The remote UE of claim 12, wherein the network comprises a base station.

### Claim 14 (depends on 8)

The remote UE of claim 8, wherein the authentication information is resumeMAC-I.