5G Relay Authorization via AMF and PCF Coordination
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Solution Overview
Problem
Current wireless communication networks face challenges in supporting the coexistence of Layer-2 and Layer-3 UE-to-Network Relays, particularly in terms of Quality of Service (QoS) and service continuity, requiring solutions for selecting the appropriate relay type and role within the 5G system.
Innovation Solution
The proposed solution involves configuring subscription data and authorization information to specify the allowed types and roles of UE-to-Network Relays and UE-to-UE Relays, with the Access and Mobility Management Function (AMF) generating and sending authorization information to the Policy Control Function (PCF, which then provisions UE ProSe policies based on these specifications, enabling seamless operation of both Layer-2 and Layer-3 relays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If both Layer-2 and Layer-3 UE-to-Network Relay types are supported in the network, then the adaptability and service coverage are improved, but the device complexity and difficulty of managing relay roles increase
Solution Approach 1:
The patent applies parameter changes by introducing specific capability parameters (layer2RelayCapability, layer3RelayCapability) and role parameters (remoteUE, relayUE) that can be configured and authorized independently. The network can dynamically adjust which relay types and roles are permitted for each UE through authorization information, allowing flexible adaptation without increasing fundamental system complexity.
Solution Approach 2:
The patent segments the relay functionality into distinct capability declarations and role authorizations. By separating the indication of relay capabilities from the assignment of relay roles, and further separating Layer-2 and Layer-3 relay support, the system manages complexity through structured division of relay management functions across different network entities (AMF, PCF).
2Reliability
If authorization information is configured to specify allowed relay types and roles, then the reliability and QoS are improved, but the loss of information and signaling overhead increase
Solution Approach 1:
The patent implements preliminary action by configuring subscription data with relay authorization information in advance, before actual relay operations begin. The AMF generates and stores authorization information specifying permitted relay types and roles ahead of time, so that when relay operations are needed, the network can quickly reference pre-configured authorization data rather than making complex decisions in real-time, reducing signaling overhead during operation.
3Adaptability or versatility
If the network selects appropriate relay types for specific services, then the adaptability and service continuity are improved, but the device complexity and policy management complexity increase
Solution Approach 1:
The patent introduces the PCF (Policy Control Function) as an intermediary between the AMF and the relay selection process. The PCF receives authorization information from the AMF and generates policy information based on these authorizations, serving as a mediator that translates high-level authorization data into service-specific relay selection policies. This intermediary approach distributes policy management complexity across multiple specialized network functions rather than concentrating it in a single entity.
Data Source
AI summary
The present disclosure generally relates to wireless or mobile communication. More particularly, the present disclosure relates to a method for providing relay functionality in a wireless communication network. The present disclosure also relates to apparatus and computer program product adapted for the same purpose. According to one embodiment, it provides a method for providing relay functionality in a wireless communication network, including the following steps carried out at a first network node: a) obtaining subscription data associated with a wireless communication device from a second network node and capability for U2N relay and/or U2U relay of the wireless communication device; b) based on the subscription data and the capability, generating authorization information specifying which role(s) the wireless communication device is authorized to act as in U2N relay and/or U2U relay; and c) sending the authorization information to a third network node.