PSFCH Resource Allocation in NR V2X Sidelink
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Solution Overview
Problem
In wireless communication systems, especially in V2X communication, the existing technologies face challenges in efficiently managing PSFCH resources due to the mismatch between the total number of SL slots and the period of PSFCH resources, leading to inefficiencies in sidelink communication.
Innovation Solution
A method is proposed where at least one resource block (RB) is allocated from a set of RBs for the physical sidelink feedback channel (PSFCH) in a PSFCH slot to a physical sidelink shared channel (PSSCH) resource, with specific slot and subchannel indices, allowing for efficient PSFCH resource mapping even when the total number of SL slots is not a multiple of the PSFCH period.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PSFCH resources are configured with a fixed period N, then PSFCH resources can be regularly allocated in every Nth SL slot, but resource allocation becomes inefficient when the total number of SL slots is not a multiple of N
Solution Approach 1:
The patent applies dynamics by making the PSFCH resource mapping adaptive rather than static. When the total number of SL slots is not a multiple of the PSFCH period N, the system dynamically adjusts the mapping by skipping the allocation of RBs corresponding to the remaining slots (MODULO(T_NUM, N)), thereby optimizing resource utilization for the actual number of slots while maintaining the regular periodic structure where applicable.
Solution Approach 2:
The patent changes the parameter allocation strategy based on the relationship between T_NUM and N. Instead of using a fixed mapping rule, the system modifies the RB allocation parameters by calculating MODULO(T_NUM, N) and adjusting which RBs are allocated and which are skipped, thereby adapting the resource mapping to the specific slot configuration.
2Reliability
If RBs are allocated for all N slots in a PSFCH period, then resource coverage is complete, but resources are wasted when fewer than N PSSCH slots actually exist
Solution Approach 1:
The patent applies partial action by allocating RBs only for the actual number of PSSCH slots that exist within the PSFCH period, rather than allocating for all N slots unconditionally. By calculating MODULO(T_NUM, N), the system performs partial allocation that matches the actual slot count, avoiding the waste of allocating resources for slots that do not exist.
3Manufacturing precision
If a MODULO function is introduced to handle non-multiple cases, then resource allocation accuracy improves, but the mapping rule becomes more complex
Solution Approach 1:
The patent applies self-service by using the MODULO function to automatically determine the correct number of RBs to allocate based on the relationship between T_NUM and N. The system self-adjusts the resource mapping by calculating the remainder and skipping the appropriate number of RBs, thereby achieving precise allocation without requiring external intervention or complex manual configuration.
Data Source
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Figure 3(a)~3(d)
AI summary
Provided are a method by which a first device performs wireless communication, and an apparatus supporting same. The method may comprise the steps of: allocating at least one resource block (RB) from among a set of a plurality of RBs for a physical sidelink feedback channel (PSFCH) in a PSFCH slot, with respect to a physical sidelink shared channel (PSSCH) resource; performing PSSCH reception from a second device on the basis of the PSSCH resource related to the PSFCH slot; and transmitting hybrid automatic repeat request acknowledgment (HARQ-ACK) information to the second device in response to the PSSCH reception, on the basis of the at least one RB allocated with respect to the PSSCH resource. Here, on the basis of the fact that the number of PSSCH slots related to the PSFCH slot is smaller than the period of the PSFCH slot, one or more RBs related to one or more resources having a slot index i to slot index n-1, from among the set of the plurality of RBs for the PSFCH, may not be allocated for PSFCH transmission or PSFCH reception.