PSFCH Resource Pool Selection in NR V2X Multi-Carrier Sidelink
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Solution Overview
Problem
In New Radio (NR) vehicle to everything (V2X) communication, determining the resource for transmitting the Physical Sidelink Feedback Channel (PSFCH) is challenging, especially in sidelink multi-carrier transmission scenarios, as existing methods do not effectively address how a receiving terminal selects the appropriate carrier for sidelink feedback.
Innovation Solution
A resource selection method and apparatus that allows a first terminal to receive sidelink data from a second terminal on multiple carriers and determine a resource pool for the PSFCH from these carriers, utilizing channel occupancy rate, configuration information, and measurement data to optimize PSFCH transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If sidelink multi-carrier transmission is introduced to improve throughput, then the system throughput increases, but the complexity of determining PSFCH transmission resources increases
Solution Approach 1:
The patent divides the multi-carrier system into separate resource pools, each associated with specific carriers. The receiving terminal segments the resource selection process by identifying which carrier pool the received sidelink data belongs to, then selecting PSFCH resources from the corresponding segmented resource pool. This segmentation approach manages complexity by breaking down the multi-carrier resource determination into manageable, carrier-specific subsets.
Solution Approach 2:
The patent introduces a new dimension for resource determination by establishing a mapping relationship between carrier pools and resource pools. Instead of selecting resources solely based on channel occupancy rate across all carriers, the system adds the dimension of carrier pool association, where the selected carrier pool directly determines the candidate resource pool for PSFCH transmission. This dimensional approach simplifies the selection process while supporting multi-carrier operations.
2Reliability
If the receiving terminal selects carrier with lowest channel occupancy rate for PSFCH transmission, then transmission reliability improves, but resource allocation efficiency decreases
Solution Approach 1:
The patent changes the selection parameter from a single criterion (lowest channel occupancy rate across all carriers) to a two-stage process: first select based on carrier pool association (deterministic parameter), then select within the associated resource pool based on channel occupancy rate (optimization parameter). This parameter change approach maintains reliability by still considering channel occupancy while improving efficiency through the structured carrier pool mapping.
3Quantity of substance
If multiple carriers are used for sidelink data transmission, then system capacity increases, but transmission conflict increases
Solution Approach 1:
The patent segments the resource space into multiple carrier pools, each with its own associated resource pool for PSFCH transmission. By segmenting resources in this way, the system accommodates multiple carriers for data transmission while preventing conflicts through dedicated feedback resources for each carrier pool, thus maintaining system capacity without proportionally increasing transmission conflicts.
Data Source
AI summary
Provided in the present application are a resource selection method and apparatus for use in a sidelink communication system. The resource selection method includes: a first terminal receives sidelink data from a second terminal on a plurality of carriers; and the first terminal may select a resource pool for transmitting a PSFCH from the plurality of carriers where the sidelink data is located, or all the plurality of carriers available for sidelink transmission.