Sidelink Resource Reallocation After LBT Failure in Shared Spectrum
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Solution Overview
Problem
Sidelink listen-before-talk (LBT) failures occur in shared spectrum scenarios, leading to inefficiencies and interference in device-to-device communication, particularly in 5G New Radio (NR) networks, as existing mechanisms fail to effectively manage resource allocation and coordination among wireless devices.
Innovation Solution
Implementing a resource selection procedure that includes periodic and contiguous partial sensing, along with inter-UE coordination, to enhance sidelink communication by addressing LBT failures and optimizing resource allocation in shared spectrum environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If listen-before-talk (LBT) procedure is implemented in shared spectrum, then interference between devices is reduced, but communication reliability deteriorates due to LBT failures
Solution Approach 1:
The patent applies preliminary action by performing sensing operations before transmission to identify available resources. The receiving device sends a sensing reference signal, and the transmitting device performs LBT based on this sensing information, allowing the system to proactively avoid interference before it occurs rather than reactively handling collisions after they happen.
Solution Approach 2:
The patent implements feedback mechanisms where receiving devices send sensing reference signals and transmit devices report LBT results back to the network. This feedback loop enables the base station to adjust resource allocation and LBT parameters dynamically, improving communication reliability by learning from past LBT failures and adapting to changing channel conditions.
2Productivity
If resource allocation is optimized for sidelink communication, then resource utilization improves, but device complexity increases due to coordination requirements
Solution Approach 1:
The patent uses the base station as an intermediary to manage sidelink resource allocation. Instead of devices directly coordinating with each other (which would be complex), the base station receives sensing information from receiving devices, performs LBT assessments, and allocates resources centrally. This mediator approach simplifies device complexity while maintaining high resource utilization through centralized optimization.
Solution Approach 2:
The patent enables self-service by allowing receiving devices to autonomously send sensing reference signals and evaluate channel conditions without continuous base station intervention. The devices serve themselves by performing local sensing and reporting results, reducing the coordination burden on the network while maintaining efficient resource utilization through distributed intelligence.
Data Source
AI summary
A first wireless device selects, from a candidate resource set in a first resource pool, a sidelink grant indicating a set of resources for one or more sidelink transmissions. The first wireless device determines a listen-before-talk (LBT) failure for a first resource of the set of resources before performing the one or more sidelink transmissions via the first resource. The first wireless device removes, based on the LBT failure of the first resource and from the sidelink grant, the first resource. The first wireless device selects, based on the LBT failure of the first resource and for the one or more sidelink transmissions, a second resource other than the first resource. The first wireless device replaces, based on the LBT failure of the first resource and for the sidelink grant, the first resource with the second resource.