Sidelink Resource Pool Coordination for Half-Duplex Hidden Nodes
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Solution Overview
Problem
The NR Rel-16 sidelink communication system faces challenges with half-duplex issues and hidden node interference due to resource collisions, as user equipment independently selects resources without sufficient prior information about other users' data, leading to inefficient inter-UE coordination.
Innovation Solution
A method for inter-UE coordination that involves determining a target time-frequency resource group based on a resource selection scheme, using pre-configured or signaled resource pools, and transmitting signals on selected resource blocks to optimize resource utilization and avoid collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If UE independently selects resources in distributed system, then resource selection flexibility is improved, but resource collision and interference increase
Solution Approach 1:
The patent introduces an intermediary coordination mechanism where UE-A acts as a mediator to assist UE-B in performing channel sensing and providing sensed available resources. This intermediary approach allows distributed UE to coordinate resource selection without centralized control, maintaining flexibility while reducing collisions through shared information about available resources.
Solution Approach 2:
The patent implements preliminary channel sensing and resource assessment by UE-A before UE-B performs actual data transmission. By performing sensing actions in advance and providing the sensed available resources to UE-B, the system prevents resource collisions before they occur, resolving the half-duplex and hidden node problems.
2Reliability
If UE-A provides preferred/non-preferred resources sensed by UE-A, then inter-UE coordination is improved, but resource matching efficiency deteriorates due to insufficient prior information
Solution Approach 1:
The patent establishes a feedback mechanism where UE-A provides sensed available resources (preferred and non-preferred) to UE-B, and UE-B uses this feedback information to select appropriate resources for data transmission. This feedback loop enables UE-B to make informed resource selection decisions that match the actual channel conditions and available resources, improving both coordination reliability and matching efficiency.
Solution Approach 2:
UE-A performs preliminary channel sensing and resource assessment before UE-B needs to transmit data. By providing the sensed available resources in advance, UE-A enables UE-B to select matching resources without waiting for real-time conditions, improving resource matching efficiency while maintaining coordination reliability.
3Productivity
If multiple UEs occupy same SL resources to transmit signals, then resource utilization is improved, but continuous interferences and resource collision occur
Solution Approach 1:
The patent introduces UE-A as an intermediary that monitors and provides information about available resources to UE-B. This intermediary mechanism enables multiple UEs to utilize SL resources more efficiently by coordinating their selections through shared sensing information, allowing higher resource utilization without continuous collisions.
Solution Approach 2:
The system performs preliminary resource assessment and sensing before data transmission. By providing sensed available resources in advance, the system enables multiple UEs to select non-colliding resources proactively, maintaining high resource utilization while preventing continuous interferences through advance coordination.
Data Source
AI summary
The present application provides a method and device in nodes for wireless communications. A first node determines a target time-frequency resource group based on a target resource selection scheme in multiple resource pools, the target resource selection scheme is one of a first resource selection scheme or a second resource selection scheme, each of the multiple resource pools is a first-type resource pool, or each of the multiple resource pools is a second-type resource pool; transmits a first-type target signal on at least one time-frequency resource block in the target time-frequency resource group; the target resource selection scheme is related to whether each of the multiple resource pools is the first-type resource pool or each of the multiple resource pools is the second-type resource pool. The present application efficiently uses inter-user coordination resources to solve the problem of half-duplex and a hidden node.