Sidelink Resource Switching After Repeated LBT Failures
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Solution Overview
Problem
The increasing demand for mobile broadband communication and V2X services in wireless communication systems faces challenges with base station overhead and the need for enhanced reliability and low latency, particularly in sidelink communications, where listen before talk (LBT) failures hinder efficient resource allocation.
Innovation Solution
A method and device for sidelink communication that includes obtaining configuration information for resource pools and LBT failure recovery, incrementing a counter for consistent LBT failures, and selecting a sidelink grant from a different resource block set upon reaching the maximum failure count, to enhance resource utilization and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If LBT is performed before SL transmission for a resource block set, then channel access is controlled to avoid collisions, but transmission efficiency decreases when LBT fails consistently
Solution Approach 1:
The patent changes the parameter of resource selection by switching from the first resource block set to a second resource block set when consistent LBT failure is detected. This parameter change allows the system to maintain reliability through continued LBT protocol adherence while improving productivity by utilizing alternative resources that may have different channel access characteristics.
Solution Approach 2:
The patent introduces dynamic resource selection capability where the system can adaptively switch between different resource block sets based on LBT performance. The gNodeB dynamically configures multiple resource pool sets with different LBT parameters, allowing the system to respond to changing channel conditions and optimize both reliability and efficiency.
2Adaptability or versatility
If multiple resource pool sets with different LBT parameters are configured, then adaptability to different channel conditions is improved, but system complexity increases
Solution Approach 1:
The patent segments the resource pools into multiple sets (first resource pool set, second resource pool set, etc.), each with different LBT parameters. This segmentation allows the system to manage complexity by organizing resources in a structured manner while maintaining adaptability through selective activation of different segments based on channel conditions.
Solution Approach 2:
The patent implements feedback mechanisms where the UE reports LBT failure counts to the gNodeB, which then uses this information to determine which resource pool set to configure. This feedback loop enables adaptability to channel conditions while managing complexity through data-driven decision making rather than requiring all configurations to be manually managed.
3Reliability
If LBT counter is incremented and maximum failure count is reached, then consistent LBT failure is triggered to switch resource sets, but latency increases due to the counting and decision process
Solution Approach 1:
The patent performs preliminary configuration of multiple resource pool sets with different LBT parameters before actual transmission occurs. The gNodeB pre-configures these resource sets so that when LBT failure is detected, the UE can quickly switch to an alternative pre-prepared resource set without needing to perform complex real-time configuration, thereby reducing switching latency while maintaining recovery reliability.
Data Source
AI summary
A method performed by a first device in a wireless communication system, and a device supporting same are provided. The method may comprise the steps of: obtaining configuration information related to a resource pool; obtaining configuration information related to SL LBT failure recovery, including information related to a maximum number of sidelink (SL) listen before talk (LBT) failures; performing LBT before SL transmission in a first set of resource blocks (RBs) in the resource pool; on the basis of the SL transmission not being performed, increasing an LBT counter by one; triggering a consistent SL LBT failure, on the basis of the LBT counter reaching the maximum number of SL LBT failures; and selecting a sidelink grant from a second set of RBs different from the first set of RBs, on the basis of the triggered consistent SL LBT failure.