ProSe Relay Selection Using Resource Status in PC5 Discovery
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in transmitting and receiving discovery messages during ProSe communication, leading to increased signaling overhead and wastage of radio resources due to unnecessary message transmission.
Innovation Solution
A method where a ProSe-enabled UE receives a PC5 discovery message from another UE with information on its resource status and selects a relay UE based on this status, determining whether to use the second UE as the relay or choose another UE if its resources are insufficient, thereby optimizing the use of radio resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If discovery messages are transmitted between all terminals in ProSe communication, then communication coverage is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts the resource status information from the discovery message transmission process. Terminals include resource status indicators in their discovery messages, allowing other terminals to assess whether they have sufficient resources to act as relays. This extraction of status information enables selective relay selection, reducing unnecessary discovery message transmissions while maintaining communication coverage.
Solution Approach 2:
The patent implements preliminary action by having terminals publish their resource status information before actual communication requests. This advance publication of resource status allows potential relay terminals to evaluate their capability in advance, preventing unnecessary discovery message exchanges and reducing signaling overhead while ensuring communication coverage is maintained through pre-identified suitable relays.
2Reliability
If discovery messages are transmitted to establish direct connections, then connection establishment is improved, but radio resource waste increases
Solution Approach 1:
The patent implements feedback by including resource status indicators in discovery messages. When a terminal receives a discovery message, it can immediately feedback whether the transmitting terminal has sufficient resources to serve as a relay. This feedback mechanism prevents wasteful transmission of subsequent connection establishment messages to terminals that cannot provide relay services, thereby reducing radio resource waste while maintaining reliable connection establishment through suitable terminals.
Solution Approach 2:
The patent applies dynamics by making the discovery message content adaptive based on resource status. Terminals dynamically adjust their discovery messages to include resource status information, and receiving terminals dynamically evaluate this information to determine whether to proceed with connection establishment. This dynamic approach ensures radio resources are not wasted on terminals incapable of providing relay services while maintaining connection establishment with suitable terminals.
3Adaptability or versatility
If all terminals attempt to relay communication, then network coverage is extended, but resource efficiency decreases
Solution Approach 1:
The patent applies local quality by having each terminal publish its specific resource status information in discovery messages. Instead of all terminals attempting to relay communication uniformly, each terminal's resource status is locally evaluated by receiving terminals. This local quality assessment ensures that only terminals with sufficient resources are selected as relays, extending network coverage through suitable terminals while maintaining resource efficiency by preventing over-utilization of terminals with limited resources.
Data Source
AI summary
Disclosed are a method and a UE for ProSe communication, the method receiving, from a second UE with which a connection for direct communication with a first UE has not been established, a PC5 discovery message comprising information regarding the second UE resource state, and selecting a relay UE with consideration for the second UE resource state.