U2U Relay Discovery Signaling for Negotiated Relay Reselection
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently discovering and establishing UE-to-UE relays for effective data communication, particularly in evolving 5G networks, which are not adequately addressed by current 3GPP standards.
Innovation Solution
A method for target end UE to establish connections with relay UEs, transmit discovery solicitation messages with specific application layer IDs, receive responses, and perform negotiated relay reselection to facilitate UE-to-UE relay communication, enhancing the discovery process in 5G ProSe networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If target end UE performs candidate U2U relay discovery by transmitting discovery solicitation messages with specific application layer IDs, then the efficiency and effectiveness of relay discovery is improved, but the device complexity increases due to additional message handling procedures
Solution Approach 1:
The patent applies preliminary action by having the target end UE pre-configure and transmit discovery solicitation messages with specific application layer IDs before actual relay selection is needed. This allows the UE to proactively initiate the relay discovery process and receive candidate relay information in advance, improving discovery efficiency without requiring complex real-time decision-making procedures.
Solution Approach 2:
The patent implements feedback mechanisms where the relay UE responds to discovery solicitation messages with discovery response messages containing candidate relay information. This feedback loop enables the target end UE to efficiently select appropriate relays based on provided information, reducing the complexity of the overall discovery process while maintaining high efficiency.
2Reliability
If the system implements negotiated relay reselection procedures, then the reliability of UE-to-UE relay communication is improved, but the loss of time increases due to additional negotiation steps
Solution Approach 1:
The patent applies preliminary action by performing relay capability assessment and candidate relay identification before the actual communication begins. The target end UE transmits discovery solicitation messages that include necessary application layer ID information upfront, allowing candidate relays to be pre-identified and assessed. This preliminary preparation enables faster relay selection during actual communication, reducing time loss while maintaining reliability through informed negotiation.
Solution Approach 2:
The patent implements dynamics by allowing flexible relay selection where the target end UE can dynamically choose from multiple candidate relays based on real-time conditions. The negotiated reselection procedure enables adaptive decision-making that balances reliability requirements with time constraints, allowing the system to optimize relay selection based on current network conditions rather than following rigid predetermined paths.
Data Source
AI summary
Methods, systems, and apparatuses are provided for target end User Equipment (UE) supporting candidate UE-to-UE (U2U) relay discovery in a wireless communication system, wherein a method for a target end UE comprises establishing a connection with a relay UE for supporting U2U relay communication between a source end UE and the target end UE via the relay UE, receiving a link modification request message indicating a list of candidate relay UEs from the relay UE for performing negotiated relay reselection, determining to transmit a discovery solicitation message to a candidate relay UE among the list of candidate relay UEs, wherein the discovery solicitation message indicates the discovery solicitation message being used for candidate U2U relay discovery by at least setting an application layer Identification (ID) indicated in the discovery solicitation message to a specific value, receiving, from the candidate relay UE, a discovery response message for candidate U2U relay discovery, and transmitting a link modification accept message, indicating the candidate relay UE, to the relay UE.