Sidelink Resource Contiguing for Reduced COT Signaling
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in unlicensed spectrum usage due to the listen before talk (LBT) procedure, which introduces delays and leads to longer channel occupancy times (COT), affecting user experience and resource utilization in sidelink communication.
Innovation Solution
A method where user equipment (UE) performs a listen before talk procedure to select and adjust resources for contiguous transmission in the time domain, allowing for reduced channel occupancy time sharing signaling, enabling efficient resource utilization and concurrent transmissions during the COT.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the listen before talk (LBT) procedure is performed in unlicensed spectrum, then channel access is ensured and transmission reliability is improved, but transmission delay increases and channel occupancy time is extended
Solution Approach 1:
The UE performs resource adjustment in advance after successfully completing the LBT procedure. By proactively contiguing resources before actual data transmission begins, the system ensures reliable channel access while minimizing the time resources are occupied during the actual transmission phase.
Solution Approach 2:
The resource allocation is made dynamic based on LBT outcomes. When LBT succeeds, the system dynamically adjusts resources to be contiguous; when LBT fails, the original resource selection is maintained. This dynamic adaptation optimizes the balance between reliability and time efficiency.
2Adaptability or versatility
If resources are selected randomly within the resource selection window, then resource allocation flexibility is improved, but resource utilization efficiency deteriorates due to non-contiguous allocations
Solution Approach 1:
The system performs preliminary resource adjustment after LBT success but before actual transmission. By contiguing resources in advance, the system maintains the flexibility of random selection within the resource selection window while improving utilization efficiency through contiguous allocation during actual transmission.
Solution Approach 2:
The contiguing operation is applied locally to the specific resources allocated to each UE based on its LBT outcome, rather than uniformly affecting all UEs. This localized adjustment maintains overall system flexibility while improving individual resource utilization efficiency.
3Manufacturing precision
If channel occupancy time (COT) sharing signaling is extensively used to coordinate multiple UEs, then resource coordination accuracy is improved, but signaling overhead increases
Solution Approach 1:
The patent extracts and removes unnecessary COT sharing signaling by implementing autonomous contiguing at each UE. Each UE independently adjusts its own resources after LBT success, eliminating the need for extensive coordination signaling while maintaining accurate resource allocation.
Solution Approach 2:
Each UE performs self-service resource adjustment by autonomously contiguing its allocated resources after successful LBT. This self-service approach replaces complex inter-UE coordination signaling with independent UE actions, reducing signaling overhead while maintaining coordination accuracy.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may select, within a resource selection window, a set of resources in which to transmit over an unlicensed sidelink channel. The UE may attempt a listen before talk (LBT) procedure to initiate a channel occupancy time in which to transmit over the unlicensed sidelink channel. The UE may adjust, within at least a portion of the resource selection window, the set of resources in which to transmit over the unlicensed sidelink channel to be contiguous in at least a time domain based at least in part on the LBT procedure succeeding. The UE may transmit, over the unlicensed sidelink channel, using the set of resources that are adjusted to be contiguous in at least the time domain. Numerous other aspects are provided.