Relay UE PDU Session QoS Mapping for 5G Relay
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently supporting UE-to-network relay communication, particularly in ensuring end-to-end quality of service (QoS) and authentication/authorization processes for UE-to-Network Relay in 5G networks, which are crucial for reliable and secure data transmission.
Innovation Solution
The implementation of a Layer-3 UE-to-Network Relay solution that utilizes a ProSe 5G UE-to-Network Relay entity to establish and manage PDU sessions, perform authentication, and ensure QoS by translating and mapping QoS parameters across different communication links, while also supporting secondary authentication and network-controlled authorization mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a relay UE forwards traffic from multiple remote UEs on a single PDU session, then resource utilization and network efficiency are improved, but QoS management and authentication complexity increase
Solution Approach 1:
The patent segments the QoS management by establishing separate QoS flows within the shared PDU session for each remote UE. The relay UE maintains individual QoS contexts for each remote UE while utilizing the shared PDU session infrastructure, thereby managing complexity through structured division of QoS parameters and flows.
Solution Approach 2:
The relay UE acts as an intermediary between multiple remote UEs and the network. It performs secondary authentication and QoS mapping for remote UEs, translating their QoS requirements into network-compatible formats while maintaining the shared PDU session, thus simplifying overall QoS management.
2Reliability
If the relay UE performs secondary authentication for remote UEs, then security and authorization are improved, but signaling overhead and authentication time increase
Solution Approach 1:
The relay UE performs secondary authentication for remote UEs in advance before allowing them to access network resources. By pre-establishing authenticated sessions and QoS parameters, the system reduces authentication delays during actual data transmission while maintaining security requirements.
3Reliability
If the relay UE maps QoS parameters from PC5 interface to Uu interface, then end-to-end QoS is improved, but parameter translation complexity increases
Solution Approach 1:
The relay UE performs systematic parameter changes by mapping QoS parameters from the PC5 interface (used for direct communication between relay and remote UEs) to the Uu interface (used for communication between relay UE and network). This involves translating QoS characteristics, flow identifiers, and service level agreements between different protocol layers while maintaining end-to-end QoS consistency.
Data Source
AI summary
A method and device are disclosed for a relay User Equipment (UE). In one embodiment, the relay UE establishes a first layer-2 link with a first remote UE. The relay UE also establishes a Protocol Data Unit (PDU) session with a network, wherein the relay UE forwards traffic of the first remote UE on the PDU session. The relay UE further establishes a second layer-2 link with a second remote UE. In addition, the relay UE forwards traffic of the second remote UE on the PDU session. Furthermore, the relay UE receives a network control signaling from the network, wherein the network control signaling is associated with the first remote UE and is used for modifying the PDU session. The relay UE also initiates a layer-2 link modification procedure toward the first remote UE in response to reception of the network control signaling.