Sidelink BWP Switching Latency Mitigation in NR V2X
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Solution Overview
Problem
The switching latency between Uu BWP and SL BWP in wireless communication systems causes interruptions in transmission and reception operations, necessitating a method to mitigate this issue and enable efficient sidelink communication.
Innovation Solution
The method involves transmitting information related to specific resources on the SL BWP and selecting non-overlapping resources for SL transmission and reception, excluding resources associated with switching latency periods, to ensure continuous communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BWP switching is performed between Uu BWP and SL BWP, then communication flexibility is improved, but transmission and reception operations are interrupted due to switching latency
Solution Approach 1:
The transmitting UE performs preliminary actions by transmitting BWP switching indication information and resource allocation information in advance before the actual BWP switching occurs. This allows the receiving UE to prepare for the switching event, ensuring that resource allocations are maintained across the switching boundary and preventing interruptions in transmission and reception operations.
Solution Approach 2:
The patent introduces BWP switching indication information as an intermediary signal that mediates the transition between BWPs. This indication information carries critical resource allocation data that acts as a bridge, ensuring continuous communication during the switching transition by providing the receiving UE with necessary information to maintain resource allocations despite the BWP change.
2Duration of action of stationary object
If resource allocation is performed during BWP switching, then communication continuity is improved, but resource overlap with switching latency periods may cause interference
Solution Approach 1:
The patent applies local quality by providing specific resource allocation information targeted at the switching scenario. The BWP switching indication information contains localized resource allocation details that are specifically relevant to the switching period, allowing precise resource management without unnecessary overlap. This targeted approach ensures communication continuity while avoiding interference by providing only the necessary resource information for the switching context.
Solution Approach 2:
The patent utilizes parameter changes by dynamically adjusting resource allocation parameters based on the BWP switching state. The resource allocation information is adapted according to the switching indication, allowing the system to optimize resource usage during the transition period. This dynamic parameter adjustment ensures that resources are allocated appropriately without overlapping with switching latency periods, thus avoiding interference while maintaining continuity.
3Reliability
If switching latency is excluded from resource allocation, then transmission interruptions are prevented, but resource utilization efficiency decreases
Solution Approach 1:
By performing preliminary action of transmitting resource allocation information before switching occurs, the system ensures that resources are pre-configured for the post-switching period. This allows the switching latency period to be excluded from resource allocation without causing interruptions, as the receiving UE already has the necessary resource information. The preliminary transmission of allocation data maintains uninterrupted transmission while improving resource utilization by avoiding waste during the switching period.
Solution Approach 2:
The patent extracts the switching latency period from the resource allocation timeline by providing resource information that specifically excludes this interval. The BWP switching indication information contains resource allocations that are valid only after the switching is complete, effectively taking out the problematic latency period from resource consideration. This extraction prevents transmission interruptions during switching while maintaining high resource utilization efficiency by not allocating resources during the non-productive latency interval.
Data Source
AI summary
Provided are a method for performing wireless communication by a first device and an apparatus supporting same. The method may comprise the steps of: transmitting, to a second device, information related to a first resource on a sidelink (SL) bandwidth part (BWP); and performing SL reception from the second device on a second resource on the SL BWP. The second resource may not overlap with the first resource.