Consecutive Resource Selection for Unlicensed Sidelink LBT
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Solution Overview
Problem
In wireless communication systems, UEs operating on unlicensed spectrums face challenges in fair coexistence with other wireless systems due to the need for successful Listen Before Talk (LBT) procedures, which can lead to channel access issues and inefficiencies in resource selection for sidelink transmissions.
Innovation Solution
A UE processor determines a number of consecutive resources based on HARQ transmission and available resources, selects these resources from a physical layer set, and adjusts the selection process to handle LBT failures and resource availability, ensuring consecutive resource allocation for improved transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LBT procedure is performed before transmission on unlicensed spectrum, then fair coexistence with other wireless systems is achieved, but channel access success rate decreases and transmission efficiency is reduced
Solution Approach 1:
The patent performs LBT procedure in advance before resource allocation and transmits multiple transport blocks consecutively within the acquired CO period. By securing the channel beforehand and preparing multiple transmissions in advance, the system reduces the impact of LBT failures on individual transmission attempts while maintaining fair coexistence through proper LBT execution.
Solution Approach 2:
The patent enables continuous transmission of multiple transport blocks within the Channel Occupancy (CO) period once LBT is successful. This continuity maximizes the utilization of the acquired channel access, improving overall transmission efficiency and compensating for the periodic LBT requirements by ensuring productive use of the channel when accessed.
2Adaptability or versatility
If resource selection is performed individually for each transport block, then flexibility in resource allocation is improved, but channel occupancy time is increased and transmission efficiency is reduced
Solution Approach 1:
The patent merges multiple transport block transmissions into a single CO period by performing LBT once and allocating multiple consecutive resources within that CO. This combining approach reduces repeated channel access attempts while maintaining the ability to allocate resources flexibly across multiple transport blocks, thereby reducing total channel occupancy time and improving transmission efficiency.
3Ease of operation
If multiple LBT procedures are performed for multiple transport blocks, then individual resource allocation is improved, but channel access overhead increases and productivity decreases
Solution Approach 1:
The patent performs the LBT procedure preliminarily once at the beginning of the CO period and then allocates multiple transport blocks within that single CO. This preliminary channel access eliminates the need for repeated LBT procedures for each transport block, significantly reducing channel access overhead and improving overall transmission productivity while still allowing individual resource allocation within the allocated CO.
Data Source
AI summary
The present application relates to methods and apparatuses for resource selection for sidelink (SL) transmission on unlicensed spectrum. One embodiment of the present disclosure provides a UE, which includes: a transceiver; and a processor coupled with the transceiver, and the processor is configured to perform operations comprising: operation A): determine a first number of consecutive resources based on a hybrid automatic repeat request (HARQ) transmission number of a medium access control protocol data unit (MAC PDU) and a total number of available resources in a channel occupancy (CO); operation B): select the first number of consecutive resources from a resource set indicated by a physical layer.