Sidelink Discovery Selection for U2U and U2N Relaying
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Solution Overview
Problem
Existing wireless communication systems face challenges in efficiently selecting between UE-to-Network (U2N) and UE-to-UE (U2U) discovery procedures for sidelink relaying, particularly when UE devices are out-of-coverage (OoC), leading to inefficiencies in resource allocation and reliability.
Innovation Solution
UE devices are configured to transmit and receive messages to facilitate the selection of either U2U or U2N discovery procedures based on the coverage status and preferences of destination UE devices, using separate Layer 2 Identifiers (L2IDs) for U2U and U2N discovery messages, allowing for dynamic selection of the most suitable relaying method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UE devices use a single discovery procedure for sidelink relaying, then the system complexity is reduced, but the reliability and efficiency of relaying selection deteriorates when devices are out-of-coverage
Solution Approach 1:
The patent segments the discovery procedure into two distinct types: U2N discovery (UE-to-Network) and U2U discovery (UE-to-UE). Each discovery type operates independently with its own message exchange pattern and selection criteria. This segmentation allows the system to choose the appropriate discovery procedure based on coverage status and relay preferences, improving reliability without requiring a single complex unified procedure.
2Adaptability or versatility
If UE devices dynamically select between U2N and U2U discovery procedures, then the adaptability to different coverage scenarios is improved, but the difficulty of detecting and measuring the optimal procedure increases
Solution Approach 1:
The patent implements feedback mechanisms where UE devices exchange relay preference information and coverage status through structured messages during the discovery process. The destination UE provides feedback about its coverage status and preferred relay type, enabling the source UE to make informed decisions about which discovery procedure to initiate. This feedback loop simplifies the selection process by providing clear decision criteria based on exchanged information.
3Measurement precision
If separate L2IDs are used for U2U and U2N discovery messages, then the precision of message routing is improved, but the quantity of signaling overhead increases
Solution Approach 1:
The patent uses a universal L2ID structure that can serve multiple functions. The same L2ID format is used for both U2N and U2U discovery messages, and the L2ID can represent different entities (source UE, destination UE, or relay UE) depending on the message type and context. This multi-functionality reduces the need for entirely separate addressing schemes while maintaining precise routing capabilities through context-aware interpretation of the L2ID.
Data Source
AI summary
The examples set forth herein are directed towards scenarios in which UE devices have the option to use either U2U discovery or U2N discovery. In these scenarios, the UE devices can be configured to facilitate selection of a discovery procedure (e.g., U2U discovery or U2N discovery) that corresponds with a preferred type of relaying (e.g., U2U relaying or U2N relaying). More specifically, the UE devices can transmit various messages to each other in order to exchange information that facilitates selection of CN the type of relaying to be used.