Sidelink PSFCH Mapping for Full Duplex Feedback Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communication systems face inefficiencies in full duplex sidelink feedback transmissions and receptions due to reliance on priority levels alone for resource allocation, leading to increased latency and reduced reliability by dropping too many PSFCH transmissions/receptions.
Innovation Solution
Sidelink UE configures a gap period between sidelink feedback resources and uses priority levels in conjunction with frequency domain resources to map PSFCH feedback, selecting subsets of transmissions and receptions based on priority and frequency domain resources to support full duplex communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If priority levels alone are used for resource allocation in full duplex sidelink feedback transmissions, then device complexity is reduced, but reliability deteriorates due to dropping too many PSFCH transmissions/receptions
Solution Approach 1:
The resource allocation process is segmented into multiple independent components: priority level determination, frequency domain resource selection, and gap period configuration. Each component operates independently to select and allocate resources for PSFCH transmissions and receptions, reducing overall system complexity while improving reliability through diversified resource selection criteria
Solution Approach 2:
The patent introduces frequency domain resources as an additional dimension for resource allocation beyond priority levels. By adding this dimensional parameter, the system expands from one-dimensional priority-based allocation to two-dimensional allocation (priority + frequency domain), enabling more reliable resource selection without significantly increasing device complexity
2Ease of operation
If only priority levels are used for mapping PSFCH feedback, then ease of operation is improved, but loss of time increases due to increased latency
Solution Approach 1:
The system performs preliminary configuration of gap periods between sidelink feedback resources in advance. This pre-configuration enables faster resource selection during actual feedback transmissions by eliminating the need for real-time resource negotiation, thereby reducing latency while maintaining ease of operation through standardized procedures
Solution Approach 2:
By introducing frequency domain resources as an additional dimension alongside priority levels, the system enables more direct and efficient resource mapping. This two-dimensional approach allows for faster resource allocation decisions compared to priority-only methods, reducing feedback transmission latency while maintaining operational simplicity
3Reliability
If gap period is configured between sidelink feedback resources, then reliability is improved by supporting full duplex PSFCH communications, but device complexity increases
Solution Approach 1:
The gap period configuration is segmented and integrated into existing resource allocation procedures rather than implemented as a separate complex mechanism. The gap configuration works in conjunction with priority levels and frequency domain resources through standardized mapping rules, reducing the perceived complexity at the device level while enabling reliable full duplex operations
Solution Approach 2:
The gap period configuration serves multiple functions simultaneously: it enables full duplex PSFCH communications, provides time separation for transmit/receive operations, and works integrally with priority-based and frequency-domain resource allocation. This multi-functionality reduces the need for separate complex mechanisms for each function
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A user equipment (UE) may identify a first set of sidelink feedback messages to transmit and a second set of sidelink feedback messages to receive, the first set of sidelink feedback messages scheduled to be transmitted concurrently with the second set of sidelink feedback messages. The UE may select a first subset of sidelink feedback messages from the first set of sidelink feedback messages to transmit and a second subset of sidelink feedback messages from the second set of sidelink feedback messages to receive based at least in part on a priority level associated with each sidelink feedback message and a first set of frequency domain resources for the first subset of sidelink feedback messages and a second set of frequency domain resources for the second subset of sidelink feedback messages.