Random Access Timing for Msg3 Repetition and Window Alignment
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Solution Overview
Problem
Existing methods for improving the success rate of random access in wireless communication systems, particularly for low-complexity and low-cost terminal devices, face challenges in managing Msg2 and Msg4 reception failures due to inconsistent understanding of the RAR window and contention resolution window, leading to inefficient resource usage and reduced coverage performance.
Innovation Solution
The method involves determining the starting time moment of a contention resolution timer based on Msg3 transmission repetitions and the RAR window based on Msg1 transmission repetitions, ensuring consistent understanding between the terminal and network devices, thereby optimizing the random access process and reducing resource consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Msg1 and Msg3 transmission repetitions are used to improve coverage performance, then the coverage performance and success rate of random access are improved, but the inconsistency in understanding of RAR window and contention resolution window between terminal device and network device increases, leading to Msg2 and Msg4 reception failures
Solution Approach 1:
The patent applies preliminary action by having the terminal device determine the starting time moment of the contention resolution timer and RAR window in advance based on the Msg3 transmission repetition configuration before the actual random access procedure occurs. This pre-determination ensures both the terminal device and network device have consistent understanding of the window timing, preventing Msg2 and Msg4 reception failures while maintaining the coverage performance improvements from transmission repetitions.
2Reliability
If transmission repetitions are performed to enhance coverage for low-complexity terminal devices, then coverage performance is improved, but resource consumption increases due to inefficient resource usage from reception failures
Solution Approach 1:
The patent applies feedback by establishing a consistent timing reference mechanism where the terminal device determines the starting time moment of critical windows (RAR window and contention resolution timer) based on the Msg3 transmission repetition configuration. This feedback mechanism ensures both terminal and network device operate with synchronized timing understanding, eliminating resource waste from failed receptions while preserving the coverage benefits of transmission repetitions.
Data Source
AI summary
Disclosed is a random access method. The method includes: determining, by a terminal device, a starting time moment of a contention resolution timer according to a time of Msg3 transmission repetitions.