Sidelink TBS Determination Using Dynamic Reference Symbols
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Solution Overview
Problem
The current method of determining Transport Block Size (TBS) based on pre-configured reference symbols fails to adapt to variable available Resource Elements (REs) in a sidelink slot, leading to inefficient resource utilization and incorrect demodulation due to higher or lower code rates.
Innovation Solution
A method for determining the number of target reference symbols, which are configured to determine the transport block size, allowing the terminal device to select appropriate symbols based on the Channel Occupancy Time (COT) and starting symbols, ensuring efficient resource allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the terminal device determines the number of available REs based on a pre-configured number of reference symbols, then the determination process is simple, but the TB size cannot adapt to the variable number of available REs in the sidelink slot
Solution Approach 1:
The patent applies dynamics by making the number of reference symbols adjustable based on transmission conditions. Instead of using a fixed pre-configured number, the system dynamically selects between a first number of reference symbols (when transmission is outside COT) and a second number of reference symbols (when transmission is within COT), allowing the TB size determination to adapt to variable available REs while maintaining operational simplicity through conditional selection.
2Productivity
If rate matching is performed to adapt TB size to available REs, then transmission efficiency is improved, but the code rate becomes lower and resources are wasted
Solution Approach 1:
The patent applies preliminary action by pre-configuring two different numbers of reference symbols for different transmission scenarios (outside COT and within COT). This allows the terminal device to directly select the appropriate number without performing rate matching operations during transmission, thereby maintaining high code rates and avoiding resource waste while ensuring the TB size adapts to the actual available REs.
3Quantity of substance
If the pre-configured reference symbol is relatively large, then the code rate increases, but the receiving terminal cannot correctly demodulate and decode
Solution Approach 1:
The patent applies parameter changes by introducing two different values for the number of reference symbols based on transmission conditions. When transmission occurs within COT, a smaller second number of reference symbols is used to ensure the code rate remains within demodulation capabilities. When transmission occurs outside COT, a larger first number of reference symbols can be used to achieve higher code rates. This parameter adaptation ensures both high code rates and reliable demodulation.
4Reliability
If the pre-configured reference symbol is relatively small, then demodulation is feasible, but rate matching is required resulting in lower code rate and resource waste
Solution Approach 1:
The patent resolves this contradiction by making the number of reference symbols dynamic rather than fixed. The system selects between a first number (larger, for outside COT) and a second number (smaller, for within COT) based on the transmission context. This allows the code rate to be optimized for each scenario: higher when outside COT with larger reference symbol count, and appropriately limited when within COT with smaller reference symbol count, eliminating the need for rate matching and resource waste.
Data Source
AI summary
A processing method includes: determining, via a terminal device, a number of reference symbols according to a first strategy. The number of reference symbols is configured to determine a transport block size. Through the technical solution of the present application, the terminal device can select different number of reference symbols for determining the transport block size according to the first strategy, thereby ensuring transmission efficiency.