Sidelink Configured Grant HARQ Allocation via Time Offset
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently allocating Sidelink Configured Grant (SL CG) resources, particularly in determining the correct start time for Physical Sidelink Control Channel (PSCCH) and Physical Sidelink Shared Channel (PSSCH) durations, which affects Hybrid Automatic Repeat request (HARQ) processes across multiple User Equipments (UEs) and destinations.
Innovation Solution
The method involves initializing or re-initializing the configured sidelink grant to determine PSCCH and PSSCH durations based on a Configured Grant (CG) time offset, which is an offset with respect to a specific System Frame Number (SFN) value, allowing for periodic reoccurrence for multiple Media Access Control (MAC) Protocol Data Units (PDUs, thereby enabling proper allocation of SL CG resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If SL CG resources are allocated without proper time offset definition, then resource allocation simplicity is maintained, but transmission timing accuracy and HARQ process coordination deteriorate
Solution Approach 1:
The patent introduces a time offset parameter (e.g., offsetValue) that shifts the starting position of SL CG resources relative to the original time point. This parameter change allows flexible adjustment of transmission timing without altering the fundamental resource allocation structure, thereby maintaining simplicity while achieving precise timing control for HARQ processes.
Solution Approach 2:
The patent pre-defines the time offset value in the configuration stage (e.g., through RRC signaling or pre-configuration) before actual transmission occurs. This preliminary action establishes the timing relationship in advance, enabling UEs to accurately determine PSCCH and PSSCH start times without complex real-time calculations, thus balancing simplicity and precision.
2Productivity
If multiple HARQ processes are handled without dedicated resource allocation, then system resource utilization is improved, but transmission reliability and process differentiation deteriorate
Solution Approach 1:
The patent segments the SL CG resources by introducing different time offsets for different HARQ processes. Each HARQ process is assigned a specific time offset value, which creates distinct resource allocations in the time domain. This segmentation allows multiple HARQ processes to share the same logical resource pool while maintaining independent and reliable transmission paths.
3Productivity
If SL CG resources are allocated without considering destination-specific timing, then resource allocation efficiency is improved, but communication reliability to different UEs deteriorates
Solution Approach 1:
The patent applies local quality by configuring destination-specific time offset values. Each receiving UE or destination can be assigned a particular offset value that optimizes its reception timing. This allows the system to maintain efficient resource allocation while adapting the timing characteristics locally for each destination, thereby ensuring reliable communication tailored to specific UE requirements.
Data Source
AI summary
A method and apparatus for allocation of Hybrid Automatic Repeat request (HARQ) identifiers (IDs) to different User Equipments (UEs) and/or different destinations is provided. A wireless device initializes or re-initializes a configured sidelink grant to determine Physical Sidelink Control Chanel (PSCCH) durations and Physical Sidelink Shared Channel (PSSCH) durations based on a Configured Grant (CG) time offset, and to reoccur with an CG period for transmissions of multiple Media Access Control (MAC) Protocol Data Units (PDUs). The CG time offset is an offset of a resource with respect to a particular System Frame Number (SFN) value and defined as the number of logical slots that can be included in a sidelink resource pool.