Sidelink Identifier Allocation for Collision Avoidance
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Solution Overview
Problem
Current technologies face challenges in efficiently allocating and managing lower identifiers (IDs) associated with upper IDs for sidelink transmission in wireless communication systems, particularly in avoiding ID collisions during sidelink control information transmissions between user equipment (UEs).
Innovation Solution
The method involves allocating a lower ID associated with an upper ID for direct links between UEs, allowing for monitoring and reception of sidelink control information (SCI) and data based on these IDs, thereby avoiding ID collisions with low overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lower IDs are allocated for sidelink control information transmission, then ID collision is avoided, but system complexity increases
Solution Approach 1:
The identifier space is segmented into upper IDs (L2 source/destination IDs) and lower IDs (L1 source/destination IDs). Upper IDs are used for MAC subheader identification while lower IDs are specifically allocated for SCI transmission. This segmentation allows differentiated handling of identifier collisions at different protocol layers, improving reliability without uniformly increasing complexity across the entire system.
Solution Approach 2:
The patent introduces lower IDs as an intermediary layer between upper IDs and physical transmission. The lower IDs act as a mediator that resolves collision issues in SCI by providing a separate identification space, while still being associated with upper IDs through configuration relationships. This intermediary approach solves the collision problem without requiring complete redesign of the existing upper ID system.
2Reliability
If lower IDs are allocated for each UE pair, then transmission reliability improves, but overhead increases
Solution Approach 1:
Instead of allocating unique lower IDs for all possible UE pairs, the patent applies partial action by allocating lower IDs only when needed for specific UE pairs engaged in sidelink communication. The lower ID allocation is conditional and selective, providing sufficient identification capability for active transmissions without provisioning excessive IDs for potential but unused connections, thus reducing overhead while maintaining reliability.
3Productivity
If lower IDs are used in SCI, then packet receiving efficiency improves, but processing complexity increases
Solution Approach 1:
The lower IDs are pre-configured and pre-associated with upper IDs before actual SCI transmission occurs. This preliminary setup allows receiving UEs to have the lower ID mapping information ready in advance, enabling efficient packet reception without requiring complex real-time processing during transmission. The preprocessing of ID relationships reduces runtime complexity while maintaining high reception efficiency.
Data Source
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AI summary
A method and apparatus for allocation of lower identifier (ID) and upper identifier (ID) for sidelink transmission in a wireless communication system is provided. A first wireless device (e.g., receiving user equipment (UE)) receives, via upper layer signaling from a second wireless device (e.g., transmitting UE), a lower ID associated with an upper ID and monitors sidelink control information (SCI) based on the lower ID and the upper ID. The first wireless device receives, from the second wireless device, a data unit scheduled by the SCI.