# US 11,903,059 B2 · Method and apparatus for quality of service (QOS) flow establishment in a wireless communication system

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- Number: US 11,903,059 B2
- Document ID: US11903059B2
- Status: Granted
- Kind: B2
- Application number: 18/098,351
- Filed: 2023-01-18
- Published: 2024-01-11
- Granted: 2024-02-13
- Earliest claimed: 2022-07-11
- Assignees: ASUS Technology Licensing Inc.
- Applicants: ASUS Technology Licensing Inc.
- Inventors: Richard Lee-Chee Kuo
- Web page: https://patentgrep.com/patent/US11903059B2

## CPC

- H04W 76/14: Direct-mode setup
- 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 for Quality of Service (QOS) flow establishment are disclosed. A relay User Equipment (UE) establishes a PC5 unicast link with a remote UE. The relay UE also receives an identity of a PC5 QoS flow and a first PC5 5G QoS Identifier (PQI) of the PC5 QoS flow from the remote UE for adding the PC5 QoS flow, wherein the first PQI indicates end-to-end QoS requirements of the PC5 QoS flow for traffic transmission between the remote UE and a network. The relay UE further derives a second PQI for the PC5 QoS flow and a 5QI for a QoS flow according to the first PQI. In addition, the relay UE transmits a Protocol Data Unit (PDU) Session Modification Request message to the network for adding the QoS flow, wherein the PDU Session Modification Request message includes an identity of the QoS flow and the 5QI.

## Claims

### Claim 1

A method for Quality of Service (QoS) flow establishment, comprising:
a relay User Equipment (UE) establishes a PC5 unicast link with a remote UE;
the relay UE receives an identifier of a PC5 QoS flow and a first PC5 5G QoS Identifier (PQI) of the PC5 QoS flow from the remote UE for adding the PC5 QoS flow, wherein the first PQI indicates end-to-end QoS requirements of the PC5 QoS flow for traffic transmission between the remote UE and a network;
the relay UE derives a second PQI for the PC5 QoS flow and a 5G QoS Identifier (5QI) for a QoS flow according to the first PQI;
the relay UE transmits a Protocol Data Unit (PDU) Session Modification Request message to the network for adding the QoS flow, wherein the PDU Session Modification Request message includes an identifier of the QoS flow and the 5QI;
the relay UE receives a PDU Session Modification Command message from the network, wherein the PDU Session Modification Command message includes the identifier of the QoS flow and an authorized 5QI for the QoS flow;
the relay UE derives a third PQI for the PC5 QoS flow according to the authorized 5QI if the authorized 5QI is different from the 5QI; and
the relay UE transmits the identifier of the PC5 QoS flow and the second PQI to the remote UE if the authorized 5QI is same as the 5QI and the relay UE transmits the identifier of the PC5 QoS flow and the third PQI to the remote UE if the authorized 5QI is different from the 5QI.

### Claim 2 (depends on 1)

The method of claim 1, wherein the relay UE does not transmit the second PQI to the remote UE before reception of the PDU Session Modification Command message from the network.

### Claim 3 (depends on 1)

The method of claim 1, wherein the second PQI and the 5QI are derived according to the first PQI and QoS mapping.

### Claim 4 (depends on 3)

The method of claim 3, wherein the QoS mapping is pre-configured or provided to the relay UE by the network.

### Claim 5 (depends on 1)

The method of claim 1, wherein the third PQI is derived according to the authorized 5QI and QoS mapping.

### Claim 6 (depends on 1)

The method of claim 1, wherein the identifier of the PC5 QoS flow and the first PQI of the PC5 QoS flow are received in a Direct Link Modification Request message.

### Claim 7 (depends on 1)

The method of claim 1, wherein the identifier of the PC5 QoS flow and the second PQI or the third PQI are transmitted in a Direct Link Modification Accept message.

### Claim 8 (depends on 1)

The method of claim 1, wherein the QoS flow corresponds to the PC5 QoS flow.

### Claim 9 (depends on 1)

The method of claim 1, wherein a Protocol Data Unit (PDU) session is established by the relay UE for the remote UE to access a service from the network via the relay UE.

### Claim 10 (depends on 1)

The method of claim 1, wherein the relay UE is a Layer-3 UE-to-Network Relay UE.

### Claim 11

A relay UE (User Equipment), 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:
establish a PC5 unicast link with a remote UE;
receive an identifier of a PC5 QoS flow and a first PC5 5G QoS Identifier (PQI) of the PC5 QoS flow from the remote UE for adding the PC5 QoS flow, wherein the first PQI indicates end-to-end QoS requirements of the PC5 QoS flow for traffic transmission between the remote UE and a network;
derive a second PQI for the PC5 QoS flow and a 5G QoS Identifier (5QI) for a QoS flow according to the first PQI;
transmit a Protocol Data Unit (PDU) Session Modification Request message to the network for adding the QoS flow, wherein the PDU Session Modification Request message includes an identifier of the QoS flow and the 5QI;
receive a PDU Session Modification Command message from the network, wherein the PDU Session Modification Command message includes the identifier of the QoS flow and an authorized 5QI for the QoS flow;
derive a third PQI for the PC5 QoS flow according to the authorized 5QI if the authorized 5QI is different from the 5QI; and
transmit the identifier of the PC5 QoS flow and the second PQI to the remote UE if the authorized 5QI is same as the 5QI and the relay UE transmits the identifier of the PC5 QoS flow and the third PQI to the remote UE if the authorized 5QI is different from the 5QI.

### Claim 12 (depends on 11)

The relay UE of claim 11, wherein the relay UE does not transmit the second PQI to the remote UE before reception of the PDU Session Modification Command message from the network.

### Claim 13 (depends on 11)

The relay UE of claim 11, wherein the second PQI and the 5QI are derived according to the first PQI and QoS mapping.

### Claim 14 (depends on 13)

The relay UE of claim 13, wherein the QoS mapping is pre-configured or provided to the relay UE by the network.

### Claim 15 (depends on 11)

The relay UE of claim 11, wherein the third PQI is derived according to the authorized 5QI and QoS mapping.

### Claim 16 (depends on 11)

The relay UE of claim 11, wherein the identifier of the PC5 QoS flow and the first PQI of the PC5 QoS flow are received in a Direct Link Modification Request message.

### Claim 17 (depends on 11)

The relay UE of claim 11, wherein the identifier of the PC5 QoS flow and the second PQI or the third PQI are transmitted in a Direct Link Modification Accept message.

### Claim 18 (depends on 11)

The relay UE of claim 11, wherein the QoS flow corresponds to the PC5 QoS flow.

### Claim 19 (depends on 11)

The relay UE of claim 11, wherein a Protocol Data Unit (PDU) session is established by the relay UE for the remote UE to access a service from the network via the relay UE.

### Claim 20 (depends on 11)

The UE of claim 11, wherein the relay UE is a Layer-3 UE-to-Network Relay UE.