Terminal Device UCI PRB Calculation Using Spreading Factor
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Solution Overview
Problem
In 5G mobile communication technology, the current calculation of physical resource blocks (PRBs) for transmitting uplink control information (UCI) does not account for the impact of spreading, resulting in insufficient PRBs to carry all UCI, leading to incomplete transmission.
Innovation Solution
A method where a terminal device determines a value range of the code rate based on the spreading factor for a first PUCCH format, receives control signaling to set a target code rate within this range, and calculates the required PRBs considering the spreading factor to ensure reliable UCI transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the terminal device calculates PRBs without considering the spreading factor, then the calculation is simple, but the PRBs are insufficient to carry all UCI
Solution Approach 1:
The patent changes the calculation parameters by introducing the spreading factor (SF) into the PRB calculation formula. The code rate is determined as r = min(0.37, 1/(SF×M)), where M is the number of PRBs and SF is the spreading factor. This parameter change ensures that the PRB calculation accounts for the resource consumption caused by spreading, thereby resolving the contradiction between calculation simplicity and transmission reliability.
2Productivity
If the code rate is set too high, then the transmission efficiency is high, but the UCI cannot be reliably transmitted when spreading is applied
Solution Approach 1:
The patent implements a feedback mechanism where the network device determines the spreading factor and notifies the terminal device. The terminal device then calculates the code rate based on this feedback information and the PRB allocation. This feedback loop ensures that the code rate is appropriately adjusted according to the actual spreading factor being used, resolving the contradiction between transmission efficiency and reliability.
Solution Approach 2:
The patent dynamically adjusts the code rate parameter based on the spreading factor. The code rate is calculated as r = min(0.37, 1/(SF×M)), which automatically reduces the code rate when the spreading factor increases, ensuring reliable UCI transmission while maintaining optimal transmission efficiency under different spreading conditions.
Data Source
AI summary
The present application provides a wireless communication method, a terminal device, and a network device. The method comprises: a terminal device determines, according to the number of bits of UCI to be transmitted and the spreading factor of a first PUCCH format, the number of PRBs for transmitting the UCI to be transmitted.