NR V2X PSFCH Resource Allocation via Priority Segmentation
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Solution Overview
Problem
In NR V2X systems, conflicts between HARQ-ACK/NACK transmissions lead to resource wastage and transmission delays due to overlapping time-domain resources, causing the need for discarding feedback packets and inefficient use of resources.
Innovation Solution
A method that associates resource selection with HARQ-ACK/NACK conflicts, using identifiers and priorities to determine whether a time-frequency resource set belongs to a target resource sub-pool, thereby avoiding conflicts and optimizing resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PSFCHs are multiplexed on the same time-domain resource, then resource utilization improves, but transmission conflicts occur causing resource wastage and delays
Solution Approach 1:
The resource pool is segmented into multiple sub-pools based on priority levels. High-priority PSFCH transmissions are allocated to dedicated sub-pools separate from low-priority transmissions. This segmentation prevents conflicts between different priority transmissions while maintaining high resource utilization within each sub-pool.
Solution Approach 2:
Different quality attributes are assigned to different resource sub-pools. High-priority sub-pools guarantee conflict-free transmission resources, while low-priority sub-pools utilize remaining resources. This local quality differentiation ensures reliable high-priority transmissions while maximizing overall resource utilization.
2Productivity
If HARQ-ACK/NACK feedback is transmitted on the same symbol for multiple slots, then feedback efficiency improves, but conflicts occur requiring feedback discarding
Solution Approach 1:
The system performs preliminary classification of PSFCH transmissions by priority before resource allocation. By pre-identifying high-priority transmissions and allocating them to dedicated sub-pools, conflicts are avoided before they occur, eliminating the need for feedback discarding and reducing transmission delays.
Solution Approach 2:
The system changes the resource allocation parameter based on priority. High-priority PSFCH transmissions are allocated to specific sub-pools with guaranteed resources, while low-priority transmissions use other sub-pools. This parameter change (priority-based sub-pool selection) resolves conflicts while maintaining feedback efficiency.
3Device complexity
If resource allocation is simplified without priority consideration, then allocation complexity reduces, but resource wastage increases due to conflicts
Solution Approach 1:
The resource pool is segmented into priority-based sub-pools, creating a simple lookup mechanism where transmissions are allocated to appropriate sub-pools based on priority. This segmentation reduces allocation complexity compared to complex conflict avoidance algorithms while eliminating resource wastage through priority-based separation.
Solution Approach 2:
The system introduces priority as a key allocation parameter, changing the allocation logic from simple round-robin or random selection to priority-based sub-pool selection. This parameter change simplifies the allocation process by providing clear allocation rules while preventing conflicts and reducing resource wastage.
Data Source
AI summary
The present disclosure provides a method and a device in a node for wireless communications. A first node receives a first signaling; transmits a second signaling; and transmits a first signal in a second time-frequency resource set; the second time-frequency resource set belongs to a target resource sub-pool; the first signaling is used to determine a first identifier, a first priority and a reference time-frequency resource set; a first time-frequency resource set is related to the reference time-frequency resource set; the second signaling is used to indicate a second identifier, a second priority and the second time-frequency resource set; a relationship between a first transmission node identified by the first identifier and a second transmission node identified by the second identifier. The present disclosure offers an effective way of addressing the resource wastes and transmission delay resulting from PSFCH conflicts in the NR V2X system.