Sub-Slot PSSCH Configuration for Flexible Wireless Scheduling
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Solution Overview
Problem
Current wireless communication systems face challenges in efficiently utilizing sub-slots for physical sidelink shared channels (PSSCHs), particularly in starting positions and configurations within a slot, which affects data transmission and control channel management.
Innovation Solution
The method involves configuring multiple PSSCHs within a slot, where at least one PSSCH starts in a symbol other than the initial data symbol, with specific configurations indicating the number, duration, and starting position of each PSSCH, and using demodulation reference signals and control information to manage resource allocation and modulation schemes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple PSSCHs are scheduled within a slot starting at different symbol positions, then resource utilization efficiency and data transmission flexibility are improved, but scheduling complexity and control channel management difficulty increase
Solution Approach 1:
The slot is segmented into multiple sub-slots, with each sub-slot containing a PSSCH that can start at different symbol positions. This segmentation allows independent scheduling of each PSSCH within its designated sub-slot, improving resource utilization while managing complexity through structured division of the time domain resources.
Solution Approach 2:
The scheduling mechanism dynamically adapts to different traffic requirements by allowing PSSCHs to start at flexible symbol positions within their respective sub-slots. The configuration enables dynamic adjustment of the number of PSSCHs per slot, their starting positions, and their durations, optimizing resource utilization for varying data transmission needs.
2Loss of time
If PSSCHs are allowed to start at symbols other than the initial data symbol, then latency is reduced and URLLC performance is improved, but control channel management and resource allocation complexity increase
Solution Approach 1:
By dividing the slot into sub-slots with PSSCHs starting at different symbol positions (including non-initial symbols), the system enables parallel data transmission that reduces overall latency. The segmentation isolates control and data channels within specific sub-slot boundaries, managing complexity through structured resource separation.
Solution Approach 2:
The configuration of multiple PSSCHs with predetermined starting positions and durations is established in advance through RRC signaling or MAC CE. This preliminary configuration allows UEs to efficiently manage multiple PSSCHs without real-time complex decision-making, reducing latency while controlling management complexity through pre-planned resource allocation.
3Adaptability or versatility
If configuration parameters for multiple PSSCHs are indicated, then scheduling flexibility and adaptability are improved, but signaling overhead and configuration complexity increase
Solution Approach 1:
A single configuration parameter set is designed to serve multiple functions: it configures the number of PSSCHs, their starting positions, their durations, and their associations with PSFCHs. This multi-functional configuration reduces signaling overhead while maintaining scheduling flexibility for different slot formats and traffic requirements.
Solution Approach 2:
The system uses configurable parameters that can be dynamically adjusted through RRC signaling or MAC CE to change the number of PSSCHs per slot, their starting symbol positions, and their durations. These parameter changes enable flexible adaptation to different scheduling requirements without requiring separate configuration messages for each parameter.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive a configuration that indicates multiple time intervals corresponding to multiple physical sidelink shared channels (PSSCHs) within a slot, wherein at least one PSSCH, of the multiple PSSCHs, starts in a symbol other than an initial data symbol of the slot. The UE may communicate in one or more PSSCHs, of the multiple PSSCHs, within the slot based at least in part on the configuration. Numerous other aspects are described.