Random Access Response Back-off Signaling for Wireless Overhead Reduction
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Solution Overview
Problem
Current wireless communication systems face inefficiencies in random access procedures, particularly in reducing overhead and optimizing radio resource usage, as they broadcast back-off parameters to all UEs, leading to unnecessary downlink overhead and inability to apply different back-off parameters to individual UEs.
Innovation Solution
The method involves transmitting a random access preamble, receiving a random access response message that includes back-off information, and using this information to perform back-off when access fails, allowing for dynamic and individualized back-off parameters to be applied to each UE, thereby reducing overhead and enhancing resource efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If back-off parameters are broadcast to all UEs through system information, then all UEs can receive back-off information, but downlink overhead increases unnecessarily
Solution Approach 1:
The patent extracts the back-off information signaling from the system information broadcast and relocates it to the random access response message. This extraction eliminates the unnecessary downlink overhead associated with broadcasting back-off parameters to all UEs, while still ensuring that UEs needing back-off information receive it through the targeted random access response mechanism.
2Adaptability or versatility
If back-off parameters are broadcast to all UEs, then all UEs receive the same parameter, but individualized back-off parameters cannot be applied
Solution Approach 1:
The patent implements local quality by enabling different back-off parameters to be assigned to different UEs based on their specific conditions (e.g., number of retransmissions, access failure causes). The random access response message structure allows the eNB to include back-off information tailored to each UE's situation, moving from uniform broadcast parameters to customized per-UE parameters without significantly increasing overall system complexity.
3Loss of energy
If back-off information is included in random access response message, then overhead is reduced and individualized parameters are enabled, but message structure becomes more complex
Solution Approach 1:
The patent merges the back-off information signaling function into the existing random access response message structure. By combining back-off parameter delivery with the random access response functionality, the system avoids creating a separate dedicated signaling channel, thus reducing overall overhead while managing the message structure complexity through integration rather than separation.
Data Source
AI summary
A method for performing random access in a wireless communication system is provided. The method includes transmitting a preamble for random access in uplink, receiving a random access response message including back-off information as a response to the preamble, and performing back-off using the back-off information when the random access has failed.