Terminal PRACH Repetition Control for Coverage and Interference
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Solution Overview
Problem
In limited coverage scenarios, terminal devices face challenges in improving PRACH coverage performance while minimizing interference by repeatedly transmitting the Physical Random Access Channel (PRACH), as increasing power is not feasible indefinitely.
Innovation Solution
The terminal device determines the number of PRACH repeated transmissions based on factors such as PRACH repeated transmission procedure, calculated transmit power, resource configuration, and downlink signal measurement, optimizing coverage and interference reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device increases the power of the PRACH repeatedly, then the coverage performance of the PRACH is improved, but the interference caused by the PRACH transmission increases and power cannot be increased indefinitely
Solution Approach 1:
The terminal device dynamically determines the number of PRACH repeated transmissions based on downlink signal measurement results and calculated transmit power, rather than using a fixed number of repetitions. This dynamic adaptation allows the system to optimize coverage performance while controlling interference based on actual channel conditions.
Solution Approach 2:
The terminal device uses feedback from downlink signal measurements and transmit power calculations to determine the appropriate number of PRACH repeated transmissions. This feedback mechanism enables the system to adjust the repetition count based on actual channel quality, improving coverage when needed while reducing unnecessary transmissions that cause interference.
2Reliability
If the terminal device performs multiple PRACH repeated transmissions, then the probability of successful detection by the network device increases, but the transmission time and resource occupation increase
Solution Approach 1:
The number of PRACH repeated transmissions is dynamically determined based on downlink signal measurement results and transmit power calculations. This dynamic approach ensures that transmissions are performed only when necessary, reducing unnecessary time occupation while maintaining detection probability through targeted repeated transmissions in challenging channel conditions.
Solution Approach 2:
The system changes the parameter of transmission repetition count based on channel conditions and power calculations. By adjusting this parameter dynamically, the system achieves optimal balance between detection probability and time efficiency, performing more repetitions only when channel conditions warrant them.
Data Source
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AI summary
A wireless communication method and a terminal device. The method comprises: a terminal device determining the number of repeated transmissions of a physical random access channel (PRACH) according to first information, wherein the first information comprises at least one of the following: a PRACH repeated transmission process corresponding to the repeated transmissions of the PRACH; the calculated transmission power of the PRACH; the resource configuration for the repeated transmissions of the PRACH; and a measurement result of a downlink signal.