Unified Relay Selection for ProSe Communication
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in selecting UE-to-UE and UE-to-Network Relays for ProSe communication, leading to unnecessary procedures and complexities in establishing direct communication paths.
Innovation Solution
A method involving a first UE transmitting a UE-to-Network Relay discovery message, selecting a second UE as both a UE-to-Network Relay and UE-to-UE Relay, and establishing direct communication with it, while also requesting and receiving UE-to-UE Relay related information to optimize relay selection and registration processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate procedures are used for selecting UE-to-Network Relay and UE-to-UE Relay, then relay selection can be performed, but the complexity of the selection process increases and unnecessary procedures are introduced
Solution Approach 1:
The patent combines the UE-to-Network Relay selection and UE-to-UE Relay selection into a single integrated procedure. The first UE selects a second UE that serves dual functions as both UE-to-Network Relay and UE-to-UE Relay, eliminating the need for separate selection procedures and reducing overall system complexity while maintaining operational effectiveness.
Solution Approach 2:
The second UE is selected to perform multiple functions simultaneously - acting as both a UE-to-Network Relay for providing network access to out-of-coverage UEs and as a UE-to-UE Relay for enabling direct communication between UEs. This multi-functional approach reduces the number of required relay nodes and simplifies the selection process.
2Loss of information
If multiple discovery messages are transmitted for different relay types, then comprehensive relay information is obtained, but the time and signaling overhead increase
Solution Approach 1:
The patent merges the discovery procedures for UE-to-Network Relay and UE-to-UE Relay into a single discovery message exchange. The first UE transmits one discovery message that elicits responses containing both UE-to-Network Relay capability information and UE-to-UE Relay capability information, thereby obtaining comprehensive relay information while minimizing discovery time and signaling overhead.
3Reliability
If separate registration procedures are implemented for different relay types, then proper network registration is achieved, but the registration process becomes more complex and time-consuming
Solution Approach 1:
The patent implements a unified registration procedure where the first UE performs network registration through the second UE that simultaneously serves as both UE-to-Network Relay and UE-to-UE Relay. This single registration process replaces what would otherwise require separate registration procedures, maintaining registration reliability while reducing procedural complexity and time requirements.
Data Source
AI summary
An embodiment of the present invention relates to a method of selecting, by a first UE, a relay in a proximity service (ProSe) in a wireless communication system, the method including the steps of transmitting a UE-to-Network Relay discovery message; selecting a second UE as the UE-to-Network Relay; setting a connection for direct communication with the second UE; and transmitting a registration request message to a group communication service application server (GCS AS) through the second UE, wherein when the UE-to-Network Relay discovery message includes UE-to-UE Relay related request information, the UE-to-UE Relay related information is received from the second UE and the second UE is selected as the UE-to-UE Relay based on the UE-to-UE relay related information.