Sidelink Feedback Channel Repetitions for Collision Avoidance
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently managing sidelink feedback channels, particularly in avoiding collisions between physical sidelink feedback channel (PSFCH) transmissions, which affect link budget and overall performance in 5G and NR networks.
Innovation Solution
Implementing a method where user equipment (UE) determines and transmits PSFCH with a quantity of repetitions based on information bits and configuration thresholds, ensuring that PSFCH resources do not collide with existing transmissions by selecting appropriate PSSCH resources, thereby optimizing sidelink channel usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSFCH transmissions are repeated to improve reliability, then link budget and communication reliability are improved, but resource collision probability increases and system complexity increases
Solution Approach 1:
The patent segments the PSFCH transmission into multiple repetitions across different time slots, where each repetition is independently managed. The resource allocation is divided into first resources for initial transmission and second resources for repetitions, preventing collisions by separating these resource sets. This segmentation allows the system to achieve improved reliability through repetitions while managing complexity through structured resource division.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the repetition quantity and pre-allocating resources for PSFCH repetitions before the actual transmission occurs. The UE determines the number of repetitions based on configured thresholds and pre-establishes the resource allocation pattern, which simplifies real-time resource management and reduces collision probability by planning ahead rather than reacting dynamically.
2Reliability
If PSFCH repetitions are implemented to enhance reliability, then communication performance is improved, but the risk of resource collision between different UEs increases
Solution Approach 1:
The patent applies local quality by assigning different resource characteristics to different transmission stages: first resources are allocated for initial PSFCH transmission while second resources with distinct time slot assignments are allocated for repetitions. This differentiation ensures that each UE's repetitions do not collide with other UEs' transmissions, as each UE independently manages its own resource allocations based on its specific transmission needs and configured thresholds.
Solution Approach 2:
The patent implements dynamics by allowing the repetition quantity and resource allocation to be adaptively determined based on configured thresholds and current transmission conditions. Each UE dynamically adjusts its PSFCH transmission strategy by determining the number of repetitions and selecting appropriate resources based on real-time requirements, which prevents fixed patterns from causing systematic collisions while maintaining flexibility to avoid resource conflicts.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a first user equipment (UE) may receive, from a second UE, a sidelink communication via a sidelink channel between the first UE and the second UE. The UE may transmit, to the second UE and based at least in part on the sidelink communication, a physical sidelink feedback channel (PSFCH) with a quantity of repetitions. Numerous other aspects are described.