Sidelink UE Grouping for RACH Sequence Sharing
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Solution Overview
Problem
In wireless communication systems, especially in sidelink systems, multiple user equipment (UEs) in close proximity often independently initiate random access channel (RACH) procedures and beam search operations, leading to inefficient resource usage and increased network congestion due to separate signal messaging, which results in higher latency and traffic collisions.
Innovation Solution
The proposed solution involves grouping UEs to share a unique random access channel (RACH) sequence and beam search results, where a master UE coordinates access for associated UEs, reducing the need for separate RACH procedures and beam search operations, thereby minimizing network congestion and traffic collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple UEs independently initiate separate RACH procedures and beam search operations, then each UE can access the channel autonomously, but network congestion increases and access latency increases due to repeated signaling
Solution Approach 1:
The patent merges multiple independent RACH procedures into a single shared procedure by allowing one UE to obtain a RACH sequence and beam search results that are then reused by other UEs in the group. This combining approach reduces the total number of separate signaling operations to the network entity, thereby reducing network congestion and access latency while maintaining autonomous access capability for each UE.
Solution Approach 2:
The patent applies preliminary action by having the first UE perform the RACH procedure and beam search operation before other UEs in the group need to access the channel. The results of these preliminary actions (RACH sequence, beam information) are then cached and reused by subsequent UEs, eliminating the need for them to repeat these operations and thereby reducing overall access latency.
2Reliability
If multiple UEs perform separate RACH procedures, then each UE ensures independent channel access, but resource usage efficiency decreases due to redundant signaling
Solution Approach 1:
The patent merges redundant RACH procedures by allowing multiple UEs to share a single obtained RACH sequence and beam search results. This merging maintains reliable channel access for each UE while significantly improving resource usage efficiency by eliminating redundant signaling operations to the network entity.
Solution Approach 2:
The patent uses copying by having subsequent UEs copy the RACH sequence and beam search results obtained by the first UE. Instead of each UE independently obtaining these resources, the successful acquisition by one UE is copied and reused by others in the group, ensuring reliable access while improving overall resource efficiency.
3Measurement precision
If each UE conducts its own beam search operation, then beam alignment can be optimized for each UE, but network signaling overhead increases due to separate results reporting
Solution Approach 1:
The patent merges separate beam search operations by allowing one UE to perform the beam search and obtain results that are then shared with other UEs in the group. This approach maintains beam alignment accuracy for each UE while significantly reducing network signaling overhead, as the beam search results are reported once and reused by multiple UEs rather than being reported separately for each UE.
Data Source
AI summary
Aspects of the present disclosure leverage the association of the multiple user equipments (UEs) in order to minimize the need for separate random access channel (RACH) procedures and beam management procedure for each UE within the group, and in turn minimize network congestion and probability of traffic collisions.