Unlicensed Sidelink Conflict Detection Using Channel Access Parameters
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Solution Overview
Problem
Current techniques for reducing interference in sidelink bands of wireless communications systems, such as LTE and 5G, fail to effectively resolve conflicts between reserved resources, leading to wasted resources and increased interference due to unsuccessful listen-before-talk (LBT) procedures.
Innovation Solution
UEs determine conflicts based on channel access parameters like channel occupancy time (COT), channel access type, and cyclic prefix extension (CPE) to identify overlapping resources, and transmit indications to reserving UEs to reselect new resources, thereby avoiding conflicts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If UEs perform LBT procedures to reduce interference in sidelink bands, then interference is reduced, but conflicts between overlapping reserved resources still occur and LBT may fail to resolve them
Solution Approach 1:
The patent applies preliminary action by having UEs determine conflicts between reserved resources before attempting LBT procedures. The conflict determination process evaluates whether resources overlap and would likely fail LBT, allowing UEs to proactively avoid conflicting resources rather than relying solely on LBT to resolve conflicts after the fact. This preliminary assessment prevents wasted LBT attempts on注定 conflicting resources.
Solution Approach 2:
The patent implements feedback through the transmission of conflict determination results from one UE to another UE. When a UE determines that its reserved resource conflicts with another UE's reserved resource, it provides feedback by indicating this conflict to the other UE, enabling the other UE to adjust its resource selection. This feedback mechanism improves overall conflict resolution reliability by sharing conflict information across the network.
2Ease of operation
If UEs use inter-UE coordination messages to reserve resources, then resource reservation is achieved, but resources are wasted when conflicts occur and LBT fails
Solution Approach 1:
The patent applies preliminary action by performing conflict determination before finalizing resource reservations. UEs assess whether their intended reserved resources conflict with other UEs' reservations and whether LBT would likely succeed or fail. This preliminary check prevents UEs from reserving resources that would inevitably be wasted due to conflicts, thereby reducing resource waste while maintaining ease of operation through automated conflict detection.
Solution Approach 2:
The patent utilizes parameter changes by evaluating channel access parameters such as channel occupancy time (COT), channel access type, and cyclic prefix extension (CPE) to determine conflict likelihood. By analyzing these parameters, UEs can predict whether LBT will succeed or fail for conflicting resources, allowing them to adjust resource selection decisions dynamically based on parameter assessments rather than static reservation rules.
3Reliability
If UEs transmit conflict indications to instruct reserving UEs to reselect resources, then conflicts are avoided, but additional signaling overhead is introduced
Solution Approach 1:
The patent applies partial action by having UEs transmit conflict indications selectively rather than universally. Conflict indications are transmitted only when conflicts are actually detected and when the determining UE believes the indication will be helpful in resolving the conflict. This partial approach maintains high conflict avoidance reliability while minimizing unnecessary signaling overhead by avoiding redundant conflict indications.
Solution Approach 2:
The patent uses an intermediary approach where the conflict determination and indication transmission acts as a mediator between resource reservation and conflict resolution. Rather than direct conflict resolution through LBT alone, the system introduces an intermediary conflict indication mechanism that facilitates coordinated resource selection among UEs, improving conflict avoidance while keeping signaling overhead manageable through targeted rather than blanket indication transmission.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may be configured to receive, from a second UE, a first sidelink control message indicating a first reserved resource to be used by the second UE for sidelink communications in a shared radio frequency spectrum band. The first UE may additionally receive, from a third UE, a second sidelink control message indicating a second reserved resource to be used by the third UE for sidelink communications in the shared radio frequency spectrum band. The first UE may transmit an indication of a conflict between the first and second reserved resources based on the first and second reserved resources overlapping in time and frequency, a signal strength for a signal received from the second UE, the third UE, or both, and a channel access parameter for communications with the second UE, the third UE, or both.