# US 12,604,349 B2 · System information delivery for layer-2-based sidelink relay

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- Number: US 12,604,349 B2
- Document ID: US12604349B2
- Status: Granted
- Kind: B2
- Application number: 17/810,140
- Filed: 2022-06-30
- Published: 2022-10-20
- Granted: 2026-04-14
- Earliest claimed: 2019-12-30
- Assignees: MediaTek Singapore Pte. Ltd.
- Applicants: MediaTek Singapore Pte. Ltd.
- Inventors: Xuelong Wang; Nathan Edward Tenny; Guan-Yu Lin
- Web page: https://patentgrep.com/patent/US12604349B2

## CPC

- H04W 4/46: for vehicle-to-vehicle communication [V2V]
- H04W 76/14: Direct-mode setup
- H04W 48/10: using broadcasted information
- H04W 76/20: Manipulation of established connections
- 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 88/04: adapted for relaying to or from another terminal or user
- H04W 92/18: between terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Apparatus and methods are provided for system information delivery through a sidelink relay in a NR network. In one novel aspect, on-demand system information is delivered to a remote UE through a PC5-RRC message. In one embodiment, the relay UE aggregates SI requests from one or more UEs in the SI Request destined to the gNB. In one embodiment, the PC5-RRC message is a PC5 unicast message based on an Uu-RRC broadcast SI Update message from the gNB. In another embodiment, the PC5-RRC message is a PC5 broadcast message, which includes a version number in a MAC header indicating an SI update broadcast. In yet another embodiment, the PC5-RRC message is a PC5 groupcast message. In one embodiment, the remote UE is in an RRC-IDLE state, and wherein the UE sends the SI Request message destined to the gNB through the sidelink in a PC5-RRC SI Request message.

## Claims

### Claim 1

A method for a relay user equipment (UE) comprising:
establishing a sidelink connection with a remote UE in a wireless network;
configuring a layer-2 (L2)-based sidelink relay path between the remote UE and a gNB in the wireless network, wherein the sidelink is a relay link in the relay path;
sending, by the relay UE, a system information (SI) Request destined to the gNB to request a set of system information blocks (SIBs) for the remote UE; and
sending, by the relay UE, the requested set of SIBs in a PC5-RRC SI Update message through the sidelink of the configured L2-based sidelink relay path to the remote UE, wherein the PC5-RRC SI Update message is a PC5 unicast message, and wherein the PC5 unicast RRC message is based on an Uu-RRC broadcast SI Update message from the qNB in response to the SI Request message from the remote UE and a subsequent PC5-RRC SI Request message indicating a set of SIBs requested from the remote UE.

### Claim 2 (depends on 1)

The method of claim 1, wherein the relay UE aggregates SI request from one or more additional UEs in the SI Request destined to the gNB.

### Claim 3 (depends on 1)

The method of claim 1, wherein the PC5-RRC SI Update message is a PC5 broadcast message.

### Claim 4 (depends on 3)

The method of claim 3, wherein the PC5 broadcast message includes a version number in a MAC header indicating a format of a MAC packet data unit (PDU) as SI update broadcast.

### Claim 5 (depends on 1)

The method of claim 1, wherein the PC5-RRC SI Update message is a PC5 groupcast message.

### Claim 6 (depends on 5)

The method of claim 5, wherein the PC5 broadcast message includes a version number in a MAC header indicating a format of a MAC packet data unit (PDU) as SI update broadcast.

### Claim 7 (depends on 5)

The method of claim 5, wherein the remote UE is identified in the PC5 groupcast message based on the SI Request message received by the relay UE.

### Claim 8 (depends on 5)

The method of claim 5, wherein the remote UE is identified in the PC5 groupcast message based on a destination identification indicating the remote UE at a MAC header.

### Claim 9 (depends on 5)

The method of claim 5, wherein the remote UE is identified in the PC5 groupcast message based on a destination identification indicating the remote UE at a sidelink control information (SCI).

### Claim 10

A method for a user equipment (UE) comprising:
establishing a sidelink connection with a relay UE in a wireless network, wherein the relay UE is connected with a gNB in the wireless network;
configuring a layer-2 (L2)-based sidelink relay path between the UE and the gNB, wherein the sidelink is a relay link in the relay path;
sending, by the UE, a system information (SI) Request message to the relay UE through the sidelink in a PC5-radio resource control (RRC) message to request a set of system information blocks (SIBs); and
receiving, from the relay UE, the requested set of SIBs in a PC5-RRC SI Update message through the sidelink of the configured L2-based sidelink relay path, wherein the PC5-RRC SI Update message is a PC5 unicast message, and wherein the PC5 unicast RRC message is based on an Uu-RRC broadcast SI Update message from the gNB in response to the SI Request message from the remote UE and a subsequent PC5-RRC SI Request message indicating a set of SIBs requested from the remote UE.

### Claim 11 (depends on 10)

The method of claim 10, wherein the UE is in an RRC-CONNECTED state, and the UE sends a Uu-RRC SI Request message destined to the qNB through the sidelink to the relay UE, and wherein the UE subsequently receives a subset the requested set of SIBs.

### Claim 12 (depends on 10)

The method of claim 10, wherein the UE is in an RRC-IDLE state, and wherein the UE sends the SI Request message destined to the relay UE through the sidelink in a PC5-RRC SI Request message.

### Claim 13

A user equipment (UE), comprising:
a transceiver that transmits and receives radio frequency (RF) signal in a wireless network;
a sidelink handler that establishes a sidelink connection with a remote UE in the wireless network;
a relay path handler that configures a layer-2 (L2)-based sidelink relay path between the remote UE and a gNB in the wireless network, wherein the sidelink is a relay link in the relay path;
a system information (SI) sender that sends an SI Request destined to the gNB to request a set of system information blocks (SIBs) for the remote UE; and
a SI handler that sends the requested set of SIBs in a PC5-RRC SI Update message through the sidelink of the configured L2-based sidelink relay path to the remote UE, wherein the PC5-RRC SI Update message is a PC5 unicast message, and wherein the PC5 unicast RRC message is based on an Uu-RRC broadcast SI Update message from the gNB in response to the SI Request message from the remote UE and a subsequent PC5-RRC SI Request message indicating a set of SIBs requested from the remote UE.

### Claim 14 (depends on 13)

The UE of claim 13, wherein the UE aggregates SI request from one or more additional UEs in the SI Request destined to the gNB.

### Claim 15 (depends on 13)

The UE of claim 13, wherein the PC5-RRC SI Update message is a PC5 unicast message, a PC5 broadcast or a PC5 group cast message.

### Claim 16 (depends on 13)

The UE of claim 13, wherein PC5-RRC SI Update message is a PC5 unicast message and is based on an Uu-RRC broadcast SI Update message from the gNB in response to the SI Request message from the remote UE and a subsequent PC5-RRC SI Request message indicating a set of SIBs requested from the remote UE.

### Claim 17 (depends on 13)

The UE of claim 13, wherein the PC5-RRC SI Update message is a PC5 broadcast message or a PC5 groupcast message that includes a version number in a MAC header indicating a format of a MAC packet data unit (PDU) as SI update broadcast or SI update groupcast, respectively.

### Claim 18 (depends on 13)

The UE of claim 13, wherein the PC5-RRC SI Update message is a PC5 groupcast message, and wherein the remote UE is identified in the PC5 groupcast message based on at least one identifiers comprising the SI Request message received by the relay UE, a destination identification indicating the remote UE at a MAC header, and on a destination identification indicating the remote UE at a sidelink control information (SCI).