Layer-2 U2U Relay Reselection Over PC5 for Stable UE Links
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently managing UE-to-UE relay communication, particularly in scenarios where traditional mobile voice communication networks are evolving to support high data throughput and multimedia services, necessitating improved methods for establishing and managing Layer-2 U2U relay connections.
Innovation Solution
A method and apparatus for supporting UE-to-UE (U2U) relay communication by enabling a first UE to establish a PC5 connection with a second UE, utilizing a message to trigger a negotiated relay reselection process, including a relay reselection indication and specific link modification operation codes to optimize Layer-2 U2U relay connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional mobile voice communication networks are used, then basic voice communication is supported, but high data throughput and multimedia services cannot be provided
Solution Approach 1:
The patent implements dynamic relay reselection mechanisms where UEs can negotiate and switch between different relay connections based on real-time communication conditions. The Link Modification Request/Accept messages enable dynamic adjustment of relay paths, allowing the network to adapt to varying data throughput requirements and service types by selecting optimal relay nodes differentially
2Ease of manufacture
If relay reselection is implemented without standardized messages, then relay optimization is difficult, but communication efficiency is maintained
Solution Approach 1:
The patent introduces specific parameter changes through standardized message elements: the Relay Reselection Indication IE triggers reselection procedures, while the Link Modification Operation Code IE with specific values (e.g., 0x01 for relay reselection) enables precise control of relay optimization. These parameterized messages transform complex relay management into standardized, efficient operations
3Reliability
If Layer-2 U2U relay connections are established, then direct UE-to-UE communication is enabled, but connection management complexity increases
Solution Approach 1:
The patent implements feedback mechanisms through bidirectional Link Modification Request and Accept messages. The initiating UE sends requests with specific operation codes, and the target UE provides feedback through acceptance responses, enabling automated connection management that reduces manual intervention complexity while maintaining reliable Layer-2 U2U relay connections
Data Source
AI summary
A method and device for a first User Equipment (UE) are disclosed. In one embodiment, the first UE establishes a PC5 connection with a second UE for supporting a UE-to-UE (U2U) relay communication. The first UE also sends to the second UE a message to trigger a negotiated relay reselection, wherein the message includes a relay reselection indication information element (IE) and a link modification operation code IE set to a specific value.