Random Access Preamble Retransmission Timing Optimization
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Solution Overview
Problem
Current random access preamble sending methods in communications technologies are inflexible, leading to delayed retransmissions and reduced efficiency due to the requirement for synchronization with a base station's response window, resulting in prolonged delays and low access efficiency.
Innovation Solution
A method where a terminal device can send a random access preamble both out of and within the response window, allowing for multiple retransmissions during the configured time period, with power ramping adjustments to enhance detection chances, thereby reducing delays and improving access efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal device waits in the configured RAR window to receive the random access response, then the terminal device can maintain synchronization with the base station, but the retransmission delay is prolonged and random access efficiency is reduced
Solution Approach 1:
The terminal device performs random access preamble retransmission before the RAR window ends, rather than waiting until the window closes. This preliminary action allows the device to proactively retransmit the preamble while the RAR window is still open, reducing the delay for receiving the random access response and improving overall random access efficiency while maintaining synchronization with the base station
2Ease of operation
If the terminal device sends the random access preamble only after the RAR window ends, then the terminal device follows the current protocol specification, but the random access efficiency is low due to delayed retransmission
Solution Approach 1:
The terminal device dynamically adjusts its random access preamble retransmission timing based on whether the RAR window has ended. The device can retransmit the preamble before the RAR window ends when access efficiency needs improvement, and follow the standard protocol of waiting until the window ends when normal operation is sufficient. This dynamic approach allows the system to adapt between protocol compliance and efficiency optimization
Data Source
AI summary
A random access preamble sending method includes sending, by a terminal device, a first random access preamble to a network device, and sending, by the terminal device during a first time period, a second random access preamble to the network device when the terminal device does not receive a random access response and when a first sending moment arrives, where the first time period is a time window to receive the random access response from the network device, and wherein the first time period comprises the first sending moment.