Sidelink Feedback Repetition Across RB-Sets for Wideband COT
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Solution Overview
Problem
In wireless communication networks, maintaining a wideband channel occupancy time (COT) in shared frequency bands is challenging due to the inability of some UEs to transmit sidelink feedback during the COT, leading to underutilization of available resources.
Innovation Solution
Implementing frequency-interlaced waveforms for sidelink transmissions and SL feedback repetition mechanisms that allow UEs to transmit SL feedback communications and repetitions across all RB-sets associated with the COT, ensuring compliance with bandwidth and power spectral density requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If SL feedback repetition is implemented across all RB-sets, then resource utilization is improved, but device complexity increases
Solution Approach 1:
The wideband COT is divided into multiple RB-sets, and SL feedback repetitions are transmitted across different RB-sets. This segmentation allows the feedback to be distributed across frequency resources, improving resource utilization while managing complexity through structured division of the transmission bandwidth.
Solution Approach 2:
The invention introduces a frequency dimension to SL feedback transmission by repeating feedback across multiple RB-sets. Instead of transmitting feedback in a single location, the repetition across frequency resources (RB-sets) creates a new dimensional approach to resource utilization, allowing mixed-capability UEs to contribute to COT maintenance.
2Productivity
If wideband COT is maintained, then spectral efficiency is improved, but compatibility with mixed-capability UEs deteriorates
Solution Approach 1:
The invention applies different transmission strategies to different UE types within the same COT. Capable UEs transmit SL feedback in all RB-sets, while mixed-capability UEs transmit only in their capable RB-sets. This local quality approach allows each UE type to operate within its capabilities while contributing to overall COT maintenance, improving both spectral efficiency and compatibility.
Solution Approach 2:
The SL feedback repetition mechanism serves multiple functions: it maintains wideband COT for capable UEs, provides fallback options for mixed-capability UEs, and ensures continuous feedback transmission across the bandwidth. This multi-functionality allows the system to accommodate different UE capabilities while maintaining overall system efficiency.
3Reliability
If SL feedback is transmitted in all RB-sets, then COT maintenance is improved, but power consumption increases
Solution Approach 1:
Mixed-capability UEs perform partial action by transmitting SL feedback repetitions only in the RB-sets they are capable of accessing, rather than across all RB-sets. This partial participation allows them to contribute to COT maintenance in their capable frequency ranges without the excessive power consumption that would result from attempting to transmit across the entire bandwidth.
Data Source
AI summary
A method of wireless communication performed by a first user equipment (UE) comprises transmitting, in a first channel occupancy time (COT), a first sidelink (SL) data communication in a first RB-set to a second UE, and a second SL data communication in a second RB-set to a third UE. The method further includes receiving, from the second UE in the first COT: a first SL feedback communication in the first RB-set; and a repetition of the first SL feedback communication in the second RB-set. The method further includes transmitting, to the second UE in the first COT after the receiving the first SL feedback communication, a third SL data communication in the first RB-set, and transmitting, to the third UE in the first COT after receiving the repetition of the first SL feedback communication, a fourth SL data communication in the second RB-set.