SRAP UE ID Assignment for Out-of-Coverage U2U Relaying
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Solution Overview
Problem
In UE-to-UE relay networks, there are challenges with identifying and assigning UE identifiers, particularly sidelink relay adaptation protocol (SRAP) identifiers, which are essential for efficient communication between UEs in 5G networks, especially when some UEs are out of coverage of the base station.
Innovation Solution
The method involves configuring UEs to self-assign or be assigned SRAP UE IDs, with conflict resolution procedures, allowing UEs to establish direct connections and communicate via sidelink transmissions, even when out of coverage, using PC5 signaling and RRC messages to manage and confirm these identifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If UEs are configured to self-assign or be assigned SRAP UE IDs in relay networks, then communication efficiency and coverage extension are improved, but device complexity and difficulty of detecting and measuring identifiers increase
Solution Approach 1:
The patent segments the identifier assignment process into distinct phases: initial self-assignment by UEs, conflict detection through signaling, and resolution through base station intervention or UE negotiation. This segmentation allows the system to maintain simplicity in normal operation while providing structured complexity only when needed for conflict resolution.
Solution Approach 2:
The patent introduces signaling messages as intermediaries to facilitate identifier assignment and conflict resolution. These messages act as a mediator between UEs and base stations, enabling automated identifier management without requiring complex direct negotiation protocols between all network entities.
2Area of stationary object
If UEs establish direct sidelink connections for communication, then coverage extension is improved for out-of-coverage UEs, but reliability of identifier assignment and communication stability deteriorate
Solution Approach 1:
The patent implements preliminary conflict resolution procedures where UEs exchange signaling messages before establishing final sidelink connections. This preliminary action allows identifiers to be assigned and validated in advance, ensuring reliability is established before the actual communication link is formed, even in out-of-coverage scenarios.
Solution Approach 2:
The patent incorporates feedback mechanisms through signaling messages that allow UEs to report identifier conflicts and receive resolution instructions. This feedback loop ensures that even in decentralized sidelink communications, identifier assignments can be validated and corrected, maintaining reliability without requiring continuous base station involvement.
3Reliability
If conflict resolution procedures are implemented for SRAP UE ID assignment, then identifier uniqueness and communication reliability are improved, but loss of time and complexity of the assignment process increase
Solution Approach 1:
The patent implements a tiered conflict resolution approach where simple conflicts are resolved through lightweight UE-level procedures, while only complex or persistent conflicts escalate to base station intervention. This partial action principle ensures that most identifier assignments complete quickly without full conflict resolution procedures, minimizing time loss while maintaining reliability.
Data Source
AI summary
Disclosed is a method related to a 5G or 6G communication system for supporting a higher data transmission rate. According to an embodiment, a method performed by a first user equipment (UE) in a wireless communication system is provided. The method comprises configuring at least one UE identifier (ID) for one or more UEs in a relay network, establishing a direct connection for sidelink communication with a relay UE for connecting the first UE and a second UE and transmitting, to the relay UE, information on the at least one UE ID.