Relay UE Selection Using S-RSRP Thresholds for ProSe Reliability
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Solution Overview
Problem
Current public safety networks, primarily based on obsolete 2G technologies, lack direct communication capabilities and stringent service requirements such as reliability and security, especially when cellular coverage fails, and the 3GPP LTE does not support UE-to-Network or UE-to-UE Relay effectively for ProSe services.
Innovation Solution
A method and apparatus for selecting a relay UE in a wireless communication system by measuring channel quality and transmitting data to the selected relay UE, which includes determining whether data needs to be relayed and identifying the relay UE responsible for relaying data, using sidelink reference signal received power (S-RSRP) and pre-configured thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If relay UE selection is implemented for ProSe services, then network coverage and service reliability are improved, but device complexity and operation procedures increase
Solution Approach 1:
The system performs preliminary actions by pre-configuring relay UE selection criteria, channel quality thresholds, and relay indication formats before actual relay operations. The remote UE pre-measures channel qualities of candidate relay UEs and pre-determines which relay UE to use, so that when relay is needed, the selection is already complete, reducing real-time complexity
Solution Approach 2:
The patent introduces an intermediary relay indication mechanism where the remote UE includes a relay indication in its uplink transmission to explicitly tell the network whether it needs relay services. This intermediary signal simplifies the overall system operation by providing clear, direct information about relay needs without requiring complex implicit negotiation protocols
2Productivity
If relay indication transmission is implemented, then relay operations efficiency is improved, but communication protocol complexity increases
Solution Approach 1:
The relay indication is merged with existing uplink communication protocols rather than being a separate standalone signal. The indication is combined with uplink data transmissions or control messages that already exist in the protocol stack, so the relay indication functionality is achieved without adding separate communication channels or procedures
Solution Approach 2:
The relay indication mechanism is designed to be universal and multi-functional, working across different ProSe service types and scenarios. The same indication format and processing logic handle various relay situations (UE-to-Network relay, UE-to-UE relay, different service types), reducing the need for multiple specialized protocols
Data Source
AI summary
A method and apparatus for selecting a relay UE in a wireless communication system is provided. A remote UE selects a relay UE whose measured channel quality with the remote UE satisfies a condition based on a threshold, and transmits data, which is required to be relayed by the relay UE to a network, to the relay UE.