UE Relay Reselection Using Coordinated Discovery Triggers
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently and quickly selecting or reselecting user equipment (UE) relays for service continuity (SC) between UEs, particularly in scenarios where UEs have outdated information about available relay candidates and lack clear coordination for relay discovery and selection.
Innovation Solution
A method and apparatus for UE-to-UE (U2U) relay (re)selection, where UEs determine triggers to request coordinated discovery and selection/reselection of relay nodes based on shared information and lists of candidates, using Model A and Model B discovery methods to ensure efficient and robust relay establishment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UEs use outdated information about relay candidates, then communication sessions can be maintained with existing relays, but relay selection efficiency and service continuity are compromised
Solution Approach 1:
The patent implements preliminary actions by having UEs maintain and update lists of candidate relays in advance, and by triggering coordinated discovery procedures before actual relay selection is needed. The first UE maintains a list of candidate relays and the second UE provides its own list, allowing both UEs to prepare relay candidate information proactively rather than reactively when communication issues arise.
Solution Approach 2:
The patent employs feedback mechanisms where the first UE receives information from the second UE about available relay candidates and communication conditions. This feedback loop allows the first UE to update its relay selection decisions based on real-time information from the second UE, ensuring both UEs have synchronized and up-to-date knowledge of available relays for optimal service continuity.
2Productivity
If UEs perform coordinated discovery and relay selection procedures, then relay selection efficiency is improved, but communication overhead and processing complexity increase
Solution Approach 1:
The patent segments the relay selection process into distinct phases: maintaining candidate lists, triggering coordinated discovery, exchanging relay information, and making selection decisions. The first UE maintains its own list of candidate relays separately from the second UE's list, and the coordination procedure is divided into trigger-based stages rather than a monolithic complex process, making it more manageable and efficient.
Solution Approach 2:
The patent uses trigger-based coordination as an intermediary mechanism that simplifies the complexity of relay selection. Instead of continuous complex coordination, the system uses discrete triggers (such as communication quality degradation or mobility events) to initiate coordinated discovery procedures, acting as a mediator that coordinates between the first and second UEs without requiring constant complex interaction.
3Reliability
If UEs continuously update relay candidate information, then communication reliability is maintained, but power consumption increases
Solution Approach 1:
The patent implements periodic action by triggering coordinated discovery procedures at specific intervals or events rather than continuously. The system monitors communication conditions and triggers relay selection procedures only when necessary (such as when communication quality degrades or mobility events occur), allowing UEs to maintain reliability through periodic updates rather than continuous operation, thereby reducing power consumption.
Solution Approach 2:
The patent applies self-service principles where UEs autonomously manage their own relay candidate lists and trigger coordinated discovery procedures based on local conditions. Each UE independently maintains its list of candidate relays and initiates coordination procedures when needed, without requiring constant external control or continuous processing, thereby reducing overall system power consumption while maintaining communication reliability.
Data Source
AI summary
There is provided an apparatus, at a user equipment, comprising means for determining, based on a trigger, to select or reselect a further user equipment to act as a relay node between the first user equipment and a second user equipment, wherein the first user equipment and the second user are in communication, determining a source of the trigger, based on the determined source, determining to provide a request from the first user equipment to the second user equipment for at least one of the following: coordinated discovery of user equipment candidates for the further user equipment, selection or reselection of the further user equipment among the user equipment candidates and providing the request from the first user equipment to the second user equipment.