Sidelink Configured Grants With Extra LBT Opportunities
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Solution Overview
Problem
Existing sidelink communication technologies in unlicensed spectrum face challenges due to the need for additional Listen-Before-Talk (LBT) opportunities, as legacy mechanisms do not adequately address the LBT status in NR unlicensed spectrum, leading to inefficiencies in transmission opportunities.
Innovation Solution
Introduce additional LBT opportunities by configuring a plurality of allocated slots and candidate transmission slots for sidelink communication, allowing UEs to manage resource grants and provide status indications related to LBT procedures, enhancing configured grant mechanisms for sidelink communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional LBT opportunities are provided through multiple allocated slots and candidate transmission slots, then transmission reliability is improved, but resource grant complexity increases
Solution Approach 1:
The resource grant is segmented into multiple allocated slots and candidate transmission slots, allowing the LBT procedure to be divided into separate attempt opportunities. This segmentation enables the system to maintain reliability through multiple chances while managing complexity by structuring each slot independently with clear roles (allocated vs. candidate).
Solution Approach 2:
The base station pre-configures multiple allocated slots and candidate transmission slots in advance, establishing the LBT opportunity structure before transmission attempts begin. This preliminary configuration reduces real-time decision complexity while ensuring reliability through pre-planned multiple opportunities.
2Reliability
If multiple allocated slots and candidate transmission slots are configured, then LBT procedure reliability is improved, but signaling overhead increases
Solution Approach 1:
Multiple slot allocations and candidate transmission opportunities are merged into a single comprehensive resource grant message from the base station to the UE. This combining approach transmits all necessary LBT procedure information in one signaling event, improving reliability through complete configuration while minimizing signaling overhead by avoiding repeated messages.
3Productivity
If legacy LBT mechanisms are used in unlicensed spectrum, then device complexity is reduced, but transmission efficiency deteriorates
Solution Approach 1:
The LBT mechanism transitions from a static legacy approach to a dynamic structure with multiple allocated slots and candidate transmission slots. This dynamic configuration adapts to unlicensed spectrum conditions by providing multiple opportunities, improving transmission efficiency while managing complexity through structured flexibility rather than rigid simplicity.
Data Source
AI summary
Apparatus, methods, and computer-readable media for on-demand sensing based on sidelink resource reevaluation are disclosed herein. An example method of wireless communication performed by a user equipment includes receiving, from a base station, a resource grant indicating a plurality of resources for sidelink communication on at least one sidelink channel for a configured period of time, in which the plurality of resources includes a plurality of allocated slots and one or more candidate transmission slots associated with respective ones of the plurality of allocated slots for additional opportunities of a listen-before-talk (LBT) procedure on the at least one sidelink channel. The method also includes transmitting, to the base station, an indication of at least one status associated with the LBT procedure used on the at least one sidelink channel.