Adaptive PUSCH Power Control for PRACH Repetition Random Access
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Solution Overview
Problem
In the New Radio (NR) system, determining the physical uplink shared channel (PUSCH) transmitting power during PRACH repetitions is challenging, as existing methods do not consider the combined reception of multiple PRACH transmissions, leading to suboptimal coverage performance of the PUSCH in the random access process.
Innovation Solution
The method involves determining the PUSCH transmitting power based on factors such as the number of PRACH repetitions, PRACH transmitting power, the number of repetition processes, information in the RAR, or power offset parameters related to PRACH repetitions, allowing for more reasonable power adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PRACH repetitions are introduced to improve coverage performance, then detection performance and PRACH coverage are improved, but determining PUSCH transmitting power becomes more complex and suboptimal
Solution Approach 1:
The patent changes the parameters used for PUSCH power determination from traditional single-PRACH-based parameters to parameters that account for multiple PRACH repetitions. Specifically, it uses the number of PRACH repetitions, PRACH transmitting power across repetitions, number of repetition processes, RAR information, and power offset parameters to dynamically adjust PUSCH power, thereby resolving the complexity while maintaining improved coverage.
Solution Approach 2:
The patent introduces feedback mechanisms where the network device provides information (such as RAR messages containing power adjustment indicators) to the terminal device. This feedback enables the terminal to determine appropriate PUSCH transmitting power based on the actual PRACH repetition outcomes, resolving the power determination complexity through adaptive feedback-based control.
2Productivity
If existing PUSCH power determination methods are used, then implementation is simple, but transmission performance and coverage of PUSCH in random access process are suboptimal
Solution Approach 1:
The patent introduces new parameters for PUSCH power determination including the number of PRACH repetitions, PRACH transmitting power across repetitions, number of repetition processes, and power offset parameters related to PRACH repetitions. These parameter changes enable the system to achieve better transmission performance and coverage by adapting power levels to the actual repetition-based random access scenario.
Solution Approach 2:
The patent makes the PUSCH power determination dynamic by considering the actual PRACH repetition outcomes. Instead of using fixed power determination methods, the system dynamically adjusts PUSCH power based on variables such as the number of repetitions performed, detected RAR information, and power offset parameters, thereby improving transmission performance while managing complexity through adaptive control.
3Reliability
If PUSCH transmitting power is not adjusted for PRACH repetitions, then power control is simple, but coverage performance and reliability of random access are degraded
Solution Approach 1:
The patent changes the power control parameters to account for PRACH repetitions. It introduces power offset parameters specifically related to PRACH repetitions and uses the number of repetitions and repetition processes as inputs for PUSCH power determination. This parameter adaptation enables the system to achieve improved coverage performance while managing the increased complexity through structured parameter relationships.
Data Source
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AI summary
A wireless communication method, a terminal device, and a network device are provided in embodiments of the present application. A PUSCH transmitting power may be determined more reasonably in a random access process in a scenario of PRACH repetitions, thereby improving transmission performance of a PUSCH in the random access process. The wireless communication method includes: determining, by a terminal device, a PUSCH transmitting power in a random access process according to first information; where the first information is at least one of: the number of PRACH repetitions, a PRACH transmitting power of the PRACH repetitions, the number of times that the PRACH repetition processes are performed, information indicated in a RAR, or a power offset parameter related to the PRACH repetitions.