Dynamic Random Access Resource Switching for Preamble Retransmission
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Solution Overview
Problem
Current wireless communication systems face challenges in improving the success rate of preamble retransmission and reducing latency, particularly in multi-beam networks where channel fading and interference can lead to random access procedure failures, especially in LTE systems.
Innovation Solution
A signal transmission method that allows terminals to dynamically switch random access resources based on measured signal quality changes, using configuration parameters to determine when to switch between downlink signals and adjust preamble transmit power to optimize retransmissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If beam sweeping is performed in a time division manner in a multi-beam network, then signal transmission range is expanded and signal interference is reduced, but random access procedure failure rate increases due to channel fading and interference
Solution Approach 1:
The patent applies dynamics by enabling the terminal to dynamically switch between different random access resources based on measured signal quality changes. Instead of using a fixed random access resource, the terminal adapts its resource selection according to downlink signal quality measurements, making the random access procedure resilient to channel fading and interference in multi-beam networks.
Solution Approach 2:
The patent implements feedback by having the terminal measure downlink signal quality and use this measurement to determine random access resource switching. The terminal continuously monitors signal quality changes and provides feedback through adaptive resource selection, improving the success rate of random access procedures in response to changing channel conditions.
2Reliability
If power or resource resetting is performed during preamble retransmission in LTE, then single beam random access failures are resolved, but the solution does not adapt to multi-beam networks and preamble retransmission success rate remains low
Solution Approach 1:
The patent makes the random access resource selection dynamic by allowing the terminal to switch resources based on signal quality measurements. This dynamic adaptation enables the system to handle multi-beam network conditions effectively, resolving the limitation of fixed resource allocation in traditional LTE preamble retransmission.
Solution Approach 2:
The patent changes the parameter of random access resource selection based on downlink signal quality measurements. By adjusting which random access resource is used according to measured signal quality, the system adapts to multi-beam network conditions and improves preamble retransmission success rate.
3Device complexity
If terminal continuously uses the same random access resource for preamble retransmission, then resource allocation is simple, but latency increases due to channel fading and interference
Solution Approach 1:
The patent introduces dynamic resource switching based on signal quality measurements, allowing the terminal to adapt to channel conditions during preamble retransmission. This reduces latency by selecting resources with better signal quality while maintaining manageable complexity through configuration parameters that guide the switching behavior.
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3
AI summary
This application discloses a signal transmission method. The method may include: obtaining, by a terminal, a first configuration parameter; determining, by the terminal based on the first configuration parameter from random access resources separately associated with a plurality of downlink signals, a random access resource used for random access preamble retransmission; and retransmitting, by the terminal, a random access preamble by using the random access resource used for random access preamble retransmission. The solution can improve a success rate of preamble retransmission and reduce latency.