Sidelink Resource Reservation via COT Structure Indicator
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing resource reservations for sidelink communications over shared radio frequency bands, particularly in ensuring reliable and efficient data transmission and retransmissions in unlicensed or shared spectrum, where channel availability is uncertain and contention-based access procedures are necessary.
Innovation Solution
Implementing a method where user equipment (UE) performs listen-before-talk (LBT) to reserve resources within specific channel occupancy times (COTs), transmitting a COT structure indicator to reserve resources for future COTs, and refraining from contention based on these reservations, while also considering traffic priority to optimize channel access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resources are reserved for future COTs in sidelink communications, then transmission reliability is improved, but channel access flexibility deteriorates
Solution Approach 1:
The patent applies preliminary action by reserving resources for future COTs in advance. The transmitting UE includes resource reservation information in the current COT that indicates resources reserved for future COTs, allowing the receiving UE to know in advance when transmissions will occur and refrain from accessing those reserved resources, thereby improving reliability while managing flexibility
Solution Approach 2:
The patent implements dynamics by allowing UEs to dynamically adjust their behavior based on reservation status. The receiving UE refrains from accessing resources only when it determines they are reserved, maintaining flexibility for non-reserved resources. The system adapts resource allocation based on traffic priority and channel conditions
2Ease of operation
If UEs perform LBT and contend for channel access in shared bands, then channel access fairness is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by having the transmitting UE perform LBT and secure the channel in advance, then reserve resources for future COTs. This preliminary channel acquisition allows subsequent transmissions to occur without repeated contention, improving transmission efficiency while maintaining fairness through the initial LBT process
Solution Approach 2:
The patent implements continuity of useful action by enabling transmissions across multiple COTs without requiring repeated LBT procedures. Once a UE successfully contends for the channel and reserves resources, it can continuously transmit across reserved resources in future COTs, eliminating the need for repeated contention and improving overall transmission efficiency
3Productivity
If resource reservation information is transmitted in current COT for future COTs, then resource utilization is improved, but signaling overhead increases
Solution Approach 1:
The patent applies segmentation by dividing resource reservation information into different components. The resource reservation information includes resource indication information identifying specific resources and reservation duration information indicating how far in advance resources are reserved. This segmentation allows efficient encoding and transmission of reservation data, improving resource utilization while managing signaling overhead through structured information organization
Data Source
AI summary
Wireless communications systems and methods related to resource reservation for sidelink communication over a shared radio frequency band are provided. The method of wireless communication performed by a user equipment (UE) includes performing, in a shared radio frequency band, a listen-before-talk (LBT) for a first channel occupancy time (COT) and transmitting, during the first COT, a COT structure indicator, wherein the COT structure indicator reserves at least one resource within a second COT different than the first COT.