Sidelink Relay UE Selection Using Battery, Temperature, and Load
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Solution Overview
Problem
Existing technologies lack a systematic approach to determine suitable relay UE candidates for Sidelink communication, leading to potential failures in maintaining indirect communication paths due to factors like increased connections, low signal strength, battery issues, or overheating, without specifying the root cause or detailed reasons for rejecting direct communication requests.
Innovation Solution
A Sidelink relay terminal equipped with a Discovery reception unit, relay request reception unit, first and second determination units, and a notification unit to assess communication capability and terminal-specific parameters, enabling the base station to select suitable relay UE based on multiple criteria, including number of connections, signal power, battery level, and temperature, and provide detailed cause information for unavailability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE selection is based only on signal strength or position, then the selection process is simple, but suitable relay UE may not be selected due to factors like battery level, temperature, or connection limits
Solution Approach 1:
The relay UE performs preliminary self-assessment of its availability status (battery level, temperature, connection count) before being selected as a relay. This pre-evaluation allows the UE to proactively indicate its suitability, reducing the need for complex real-time assessments during selection and improving both reliability and efficiency
Solution Approach 2:
The relay UE provides feedback information about its operational status (battery level, temperature, number of connections) to the network. This feedback mechanism enables the network to make informed selection decisions based on multiple criteria beyond just signal strength, resolving the contradiction between simple selection and reliable relay performance
2Reliability
If relay UE accepts all direct communication requests, then communication connectivity is maintained, but the relay UE may become overloaded due to increased connections, low battery, overheating, or weak signal
Solution Approach 1:
The relay UE performs preliminary checks on its operational status (battery level, temperature, connection count) before accepting new communication requests. By proactively preventing overload conditions, the system avoids the harmful effects of overloading while maintaining stable communication paths for acceptable relays
Solution Approach 2:
The relay UE autonomously monitors its own operational status and makes decisions about accepting or rejecting communication requests based on its current state. This self-service approach allows the relay UE to protect itself from harmful overload conditions while maintaining necessary connectivity
3Loss of information
If relay UE rejects direct communication requests without providing reasons, then communication overhead is reduced, but the base station cannot identify suitable relay UE candidates among multiple options
Solution Approach 1:
When a relay UE rejects a direct communication request, it provides feedback information about the rejection reason (e.g., battery level, temperature, connection count). This feedback enables the base station to understand which relays are suitable and which are not, improving selection efficiency without significant overhead
Data Source
AI summary
A Sidelink relay terminal having a 3GPP® Sidelink communication function includes a Discovery reception unit, a relay request reception unit, a communication establishment unit, a determination unit configured to determine whether to execute the communication establishment unit based on an upper or lower limit value of a factor set by the Sidelink relay terminal, and a notification unit configured to notify a base station of information indicating that a request is rejected or approved and detailed cause information indicating the cause of the rejection or approval in a case where the determination unit determines to execute or not execute the communication establishment unit.