Cooperative UE Resource Selection for Hidden-Node Collisions
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Solution Overview
Problem
Existing sidelink communication technologies face issues such as the 'hidden-node' and 'half-duplex' problems, particularly in unicast and groupcast scenarios, leading to transmission collisions and reduced reliability due to the lack of centralized control and resource sensing limitations.
Innovation Solution
A cooperative resource selection method where a receiving UE provides preferred resources to a transmitting UE based on sensing and exclusion procedures, considering factors like packet priority, RSRP, and channel busy ratio to avoid collisions and improve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmit UE performs autonomous resource selection based on sensing in existing mode 2, then resource allocation flexibility is improved, but transmission reliability deteriorates due to hidden-node and half-duplex problems
Solution Approach 1:
The receiving UE acts as an intermediary by providing resource selection assistance information to the transmitting UE. This intermediary role enables the transmitting UE to make more reliable resource selections by considering the receiving UE's perspective on channel conditions, thereby resolving the hidden-node and half-duplex problems while maintaining autonomous resource allocation flexibility.
Solution Approach 2:
The receiving UE provides feedback in the form of resource selection assistance information, including preferred resource indicators and channel state information. This feedback loop enables the transmitting UE to adjust its resource selection strategy to avoid collisions and improve transmission reliability while maintaining system adaptability.
2Object-generated harmful factors
If a transmit UE performs sensing of sidelink resources to avoid collisions, then transmission collision avoidance is improved, but resource selection accuracy deteriorates due to hidden-node problem
Solution Approach 1:
The receiving UE serves as an intermediary that provides the transmitting UE with accurate channel state information and preferred resource indicators. This intermediary information compensates for the transmitting UE's limited sensing capability in hidden-node scenarios, enabling more accurate resource selection and collision avoidance.
Solution Approach 2:
The receiving UE performs preliminary assessment of channel conditions and prepares resource selection assistance information before the transmitting UE makes its resource selection. This preliminary action enables the transmitting UE to select resources with higher accuracy by incorporating the receiving UE's advance knowledge of the channel state.
3Device complexity
If resource selection is performed autonomously without centralized control, then system complexity is reduced, but transmission reliability deteriorates due to lack of coordination
Solution Approach 1:
The UEs serve themselves by autonomously exchanging resource selection assistance information and making coordinated resource selections without centralized control. This self-service mechanism enables the system to maintain low complexity while achieving improved transmission reliability through distributed coordination between transmitting and receiving UEs.
Data Source
AI summary
A user equipment (UE) and a resource selection method in sidelink communication are provided. The resource selection method by a first UE includes receiving sidelink data traffic and transmission related information from a second UE and reporting, to the second UE, a set of one or more preferred resources or slot timings of a sidelink resource pool. This can solve issues in the prior art, mitigate a transmission collision, provide a good communication performance, and/or provide high reliability.