Dynamic PSFCH Resource Configuration for Reliable Sidelink Feedback
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Solution Overview
Problem
Current wireless communication systems face reliability issues with physical sidelink feedback channel (PSFCH) resource allocation, particularly in supporting hybrid automatic repeat/request (HARQ) feedback reporting, as the conventional resource configuration is insufficient to meet the reliability and quality-of-service requirements for certain transmission types.
Innovation Solution
The system dynamically configures additional resources for PSFCH and/or sidelink data channels, allowing user equipment (UEs) to select a second resource configuration that satisfies the resource threshold, enabling more reliable feedback message transmission by reallocating symbols or using different slots.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PSFCH resource configuration is used, then device complexity is reduced, but reliability of feedback transmission deteriorates due to insufficient resources
Solution Approach 1:
The patent implements dynamic PSFCH resource configuration where the resource allocation is not fixed but can be adjusted based on channel conditions and QoS requirements. The system dynamically selects between different resource configuration modes (first mode with conventional allocation, second mode with additional resources) to optimize feedback transmission reliability while managing device complexity through adaptive rather than static configuration.
Solution Approach 2:
The patent changes key parameters of the PSFCH resource configuration including the number of symbols allocated to PSFCH, the slot offset, and the resource block allocation. By modifying these parameters dynamically based on traffic requirements and channel conditions, the system achieves higher feedback transmission reliability without permanently increasing device complexity, as the complexity only arises when parameter changes are actually needed.
2Reliability
If additional resources are allocated to PSFCH, then feedback message transmission reliability improves, but available resources for sidelink data channels decrease
Solution Approach 1:
The patent employs dynamic resource allocation where the split between PSFCH and sidelink data channel resources is not fixed but adapts based on current communication needs. When HARQ feedback reliability is critical, the system dynamically allocates more symbols to PSFCH; when data throughput is prioritized, fewer symbols are allocated to PSFCH. This dynamic approach resolves the contradiction by allowing flexible trade-offs rather than permanent resource deductions.
Solution Approach 2:
The patent applies partial action by allocating additional PSFCH resources only when and where needed, rather than universally increasing PSFCH resources across all scenarios. The system uses the first resource configuration mode for conventional allocations and switches to the second mode with additional resources only when specific QoS requirements or channel conditions demand enhanced feedback reliability, thus minimizing the impact on data channel resources while achieving reliability improvements where necessary.
3Adaptability or versatility
If dynamic resource configuration is implemented, then adaptability to different QoS requirements improves, but device complexity increases due to multiple configuration modes
Solution Approach 1:
The patent segments the resource configuration into distinct modes (first mode with conventional allocation, second mode with additional resources and modified parameters). Each mode is independently defined with specific parameter sets, allowing the system to switch between predefined configurations rather than managing continuous parameter adjustments. This segmentation reduces configuration management complexity while maintaining adaptability to different QoS requirements.
Solution Approach 2:
The patent performs preliminary configuration by pre-defining multiple resource configuration modes with specific parameter settings before actual communication occurs. The system prepares the first and second modes in advance, each optimized for different scenarios, and simply selects the appropriate pre-configured mode based on current needs. This preliminary action reduces real-time configuration complexity while maintaining high adaptability to varying QoS requirements.
Data Source
AI summary
Methods, systems, and devices for wireless communications are described. A first user equipment (UE) may determine that the first UE is to receive a sidelink transmission from a second UE, the sidelink transmission comprising a sidelink control channel and a sidelink data channel. The first UE may receive, based at least in part on a first resource configuration for a sidelink feedback channel failing to satisfy a resource threshold associated with transmitting a feedback message, an indication of a second resource configuration from the second UE, the second resource configuration for transmitting the feedback message to the second UE for the sidelink transmission, the second resource configuration satisfying the resource threshold. The first UE may receive the sidelink transmission from the second UE. The first UE may transmit, to the second UE, the feedback message using the second resource configuration.