Sidelink Buffer Sizing Using Data Rate and Round-Trip Time
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Solution Overview
Problem
The challenge of calculating a buffer size for terminal devices in sidelink communication, such as V2X and NR sidelink communication, is not adequately addressed by existing communication protocols.
Innovation Solution
A method for determining buffer size in terminal devices based on sidelink data rates, including transmit and receive data rates, round trip time, and other parameters, to accurately calculate the layer 2 buffer size for sidelink communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a terminal device on sidelink needs to calculate buffer size, then communication quality can be improved, but there is no defined method in existing protocols leading to implementation uncertainty
Solution Approach 1:
The patent applies parameter changes by introducing specific variables for sidelink buffer calculation including sidelink data rate (SLDataRate), sidelink round trip time (SL RTT), and buffer size (Buffer Size). These parameters are defined through mathematical relationships that allow terminal devices to calculate appropriate buffer sizes based on actual sidelink communication conditions, resolving the implementation uncertainty while improving communication reliability
2Measurement precision
If buffer size is calculated based on sidelink data rate and round trip time, then calculation accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent implements self-service by enabling terminal devices to autonomously calculate their own buffer sizes using the defined formula Buffer Size = SLDataRate × SL RTT. The terminal device uses its own measured or configured parameters (sidelink data rate and round trip time) to determine the appropriate buffer size without requiring complex network-side calculations or external assistance, thereby improving accuracy while keeping computational complexity manageable
Data Source
AI summary
This application provides a buffer determining method and apparatus, to resolve a problem of how a terminal device on a sidelink calculates a buffer size. The method includes: A terminal device determines a sidelink data rate, and determines a buffer size based on the sidelink data rate. In this embodiment of this application, the terminal device may determine the buffer size based on the sidelink data rate, to calculate a buffer size of terminal device in sidelink communication.