Two-Step Random Access Signaling Overhead Reduction
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Solution Overview
Problem
The two-step random access procedure in wireless communication systems faces challenges in reducing signaling overhead and minimizing access delay, particularly when the network device only receives the preamble but not the uplink data.
Innovation Solution
A method where the terminal device sends a preamble and uplink data, and upon detection by the network device only, sends scheduling information indicating the terminal device to retransmit the uplink data, thereby avoiding the need to reinitiate the random access procedure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If a two-step random access procedure is adopted to reduce signaling overhead, then signaling overhead is reduced, but access delay increases when uplink data is not detected
Solution Approach 1:
The patent segments the random access procedure into distinct detection outcomes: when the network device detects only the preamble (without uplink data), it sends a first indication to trigger preamble retransmission; when uplink data is detected, it sends a second indication to trigger data retransmission. This segmentation allows targeted retransmission actions that reduce unnecessary signaling while minimizing access delay.
Solution Approach 2:
The patent implements dynamic behavior where the network device's response adapts based on detection results. The terminal device dynamically switches between different retransmission modes (preamble retransmission vs. data retransmission) based on the indication received, optimizing the balance between signaling overhead and access delay according to actual channel conditions.
2Reliability
If the terminal device retransmits both preamble and uplink data upon failure, then reliability is improved, but access delay increases
Solution Approach 1:
The patent employs feedback mechanisms where the network device provides explicit indications to the terminal device about what was detected (preamble only, uplink data only, or both). This feedback enables the terminal device to perform targeted retransmissions rather than blindly retransmitting both preamble and data, improving reliability while reducing access delay through intelligent retransmission decisions.
Solution Approach 2:
The patent changes the transmission parameters dynamically based on network device detection results. When only preamble is detected, the terminal changes to preamble-only retransmission mode; when only data is detected, it switches to data retransmission mode. This parameter adaptation maintains reliability while minimizing unnecessary retransmission delays.
Data Source
AI summary
Provided by the present disclosure are a wireless communication method and device. The method includes that a terminal device sends a first message to a network device, wherein the first message includes a preamble and uplink data, the terminal device receives scheduling information sent by the network device, the scheduling information being configured to indicate the terminal device to retransmit the uplink data, and on the basis of the scheduling information, the terminal device retransmits the uplink data.