Sidelink PSFCH Resource Allocation for Channel Access Efficiency
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Solution Overview
Problem
The inefficiency of channel access for physical sidelink feedback channels (PSFCH) in sidelink communication systems, particularly when channel access processes fail, leading to overhead and reduced transmission efficiency due to the uncertainty of channel access mechanisms like LBT in shared spectrum environments.
Innovation Solution
A method where a terminal device associates a physical sidelink shared channel (PSSCH) with multiple PSFCH transmission resources, allowing flexible selection of one PSFCH transmission resource for feedback transmission, even if the initial channel access fails, thereby improving channel access efficiency and reducing overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channel access process (LBT) is performed before PSFCH transmission in shared spectrum, then channel access efficiency is improved, but transmission reliability deteriorates when channel access fails
Solution Approach 1:
The patent pre-associates multiple PSFCH transmission resources with a single PSSCH before actual transmission. This preliminary preparation of multiple potential feedback channels ensures that when channel access succeeds, the appropriate resource can be selected, and when it fails, alternative resources are already available, thus improving reliability without sacrificing access efficiency.
Solution Approach 2:
The patent changes the parameter of PSFCH resource association from one-to-one to one-to-many. By allowing a single PSSCH to be associated with multiple PSFCH transmission resources, the system gains flexibility in selecting available resources after channel access, thereby improving transmission reliability while maintaining efficient channel access through mechanisms like LBT.
2Reliability
If multiple PSFCH transmission resources are associated with a single PSSCH, then transmission reliability is improved, but resource overhead increases
Solution Approach 1:
The patent applies partial action by having the terminal device select only one PSFCH transmission resource from the multiple associated resources based on channel access results. While multiple resources are prepared (excessive preparation for reliability), only the necessary one is actually used (partial utilization), thus achieving high reliability without proportionally increasing actual resource consumption and overhead.
3Quantity of substance
If single PSFCH resource is associated with PSSCH, then resource overhead is reduced, but channel access certainty deteriorates when access fails
Solution Approach 1:
The patent pre-associates multiple PSFCH transmission resources with a single PSSCH before actual transmission. This preliminary preparation of multiple potential feedback channels ensures that when channel access succeeds, the appropriate resource can be selected, and when it fails, alternative resources are already available, thus improving reliability without sacrificing access efficiency.
Data Source
AI summary
The present disclosure provides a method and a device for sidelink communication. One example method includes: performing, by a terminal device, channel listening on a shared spectrum; and in response to a result of the channel listening being idle channels, transmitting, by the terminal device, a first sidelink channel by using a consecutive-slots transmission; wherein the consecutive-slotstransmission comprises a transmission over a plurality of consecutive time slots, a first transmission block carried by the first sidelink channel includes transmission data corresponding to the plurality of consecutive time slots.