Aligning Basic Safety Message Periodicity with SPS for C-V2X
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Solution Overview
Problem
Current wireless communication systems face challenges in reducing semi-persistent scheduling latency and ensuring timely delivery of basic safety messages in C-V2X deployments, where misalignment between basic safety message generation periodicity and SPS periodicity leads to inefficient resource use and increased information age.
Innovation Solution
The method involves adjusting the basic safety message generation periodicity to align with the SPS periodicity by rounding it to multiples of 100 milliseconds or permitted specifications, and generating messages at offset times relative to anchor or transmit times to minimize latency and information age, with the option to transmit non-SPS messages when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If basic safety message generation periodicity is independently set without alignment to SPS periodicity, then message generation flexibility is improved, but resource utilization efficiency deteriorates due to unused SPS resources
Solution Approach 1:
The patent adjusts the basic safety message generation periodicity parameter to align with SPS periodicity parameters (100ms, 200ms, 400ms, 800ms). By changing the generation periodicity to match allowed SPS values, the system ensures that messages are generated at times that can be efficiently transmitted using SPS resources, eliminating wasted resources while maintaining operational flexibility through the ability to select from multiple standardized periodicity options.
2Ease of operation
If message generation occurs without alignment to transmission periodicity, then generation timing independence is improved, but information freshness deteriorates due to increased information age
Solution Approach 1:
The system performs preliminary alignment of message generation timing with transmission periodicity. By pre-configuring the generation periodicity to match SPS transmission intervals, messages are ready for transmission at the optimal moment when SPS resources become available, minimizing the time messages spend in the system and reducing information age while maintaining operational simplicity.
3Device complexity
If SPS periodicity is fixed to standard values, then transmission scheduling simplicity is improved, but latency reduction capability deteriorates when misalignment occurs
Solution Approach 1:
The patent employs standardized SPS periodicity values (100ms, 200ms, 400ms, 800ms) that simplify transmission scheduling while enabling latency optimization. By changing the message generation periodicity to match these standard values, the system maintains scheduling simplicity through standardized intervals while eliminating misalignment delays that would occur with non-standard periodicities, thus reducing transmission latency.
Data Source
AI summary
Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may adjust a basic safety message generation periodicity based at least in part on a semi-persistent scheduling periodicity for transmitting basic safety messages. The UE may generate one or more basic safety messages based at least in part on the adjusted basic safety message generation periodicity. Numerous other aspects are provided.