Base Station Random Access Response Preamble Handling
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Solution Overview
Problem
In LTE networks, terminals beyond a cell's radius often experience unsuccessful access due to inconsistencies in preamble IDs detected by base stations, leading to failed random access and handover attempts.
Innovation Solution
The base station generates multiple random access response messages, including one with a preamble value identical to the detected value and another with a corrected value obtained by accumulating the detected preamble value, to increase the likelihood of successful access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the base station uses a single detected preamble value to generate the random access response, then the response generation is simple and fast, but the access success rate decreases when terminals are beyond cell radius
Solution Approach 1:
The patent segments the random access response generation into multiple versions, each containing a different preamble value (original detected value and corrected accumulated values). This segmentation allows the system to handle the uncertainty of terminal position by providing multiple possible preamble matches, thereby improving access success rate for terminals beyond cell radius while maintaining manageable complexity through structured generation of these segmented responses
Solution Approach 2:
The patent changes the preamble value parameter in the random access response by generating multiple versions with different preamble values (original detected value and corrected values obtained by accumulation). This parameter variation addresses the inconsistency between detected and actual preamble values caused by terminal position beyond cell radius, improving access reliability without requiring complex re-detection mechanisms
2Reliability
If the base station generates multiple random access response messages with different preamble values, then the access success rate increases, but the signaling overhead and processing load increase
Solution Approach 1:
The patent applies partial action by generating a limited number of corrected preamble values through accumulation rather than exhaustively searching all possible preamble values. This partial correction approach (using accumulated values to adjust the detected preamble) provides sufficient improvement in access success rate while controlling the quantity of generated responses, avoiding excessive signaling overhead
Solution Approach 2:
The patent creates copies of the random access response message with modified preamble values instead of generating entirely new responses. By copying the original response structure and only adjusting the preamble value parameter (using accumulated corrections), the system reduces processing load and signaling overhead compared to generating completely independent responses for each scenario
Data Source
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AI summary
Embodiments of this application disclose a random access method. The method includes: detecting, by a base station, a first preamble value; generating, by the base station, at least two random access response messages based on the first preamble value, where in the at least two random access response messages: at least one random access response message includes a second preamble value, and at least one random access response message includes a third preamble value, where the second preamble value is the same as the first preamble value, and the third preamble value is a preamble value obtained after the base station accumulates the first preamble value based on a preset accumulation number; and sending, by the base station, the at least two random access response messages to a terminal. In this way, the terminal can successfully access the base station provided that a plurality of random access response messages include a preamble value the same as the preamble value sent by the terminal, thereby increasing a success rate of accessing the base station by the terminal.