Random Access Timestamp Reporting for RACH Load Prediction
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Solution Overview
Problem
In 3GPP LTE systems, the base station (eNB) faces challenges in accurately estimating the time period during which user equipment (UE) attempts random access due to the large variance in back-off intervals, leading to inaccurate reporting of random access attempts.
Innovation Solution
The proposed solution involves reporting detailed back-off interval information, including sequence, sum, average, and variance of back-off intervals, as well as timestamp information for initial preamble transmission and contention resolution, to improve the accuracy of random access reporting through UEInformationRequest and UEInformationResponse messages using RRC signalling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If detailed back-off interval information and timestamp information are reported through RRC signalling, then measurement precision of random access time period is improved, but device complexity and signalling overhead increase
Solution Approach 1:
The patent extracts only the essential timing information (timestamps of initial preamble transmission and contention resolution message reception) and back-off interval statistics from the complete random access procedure, reporting only these specific parameters through RRC signalling rather than all possible random access details. This selective extraction maintains measurement precision while reducing signalling overhead and processing complexity.
Solution Approach 2:
The patent implements partial reporting by providing selected timing information (first and second timestamps) and back-off statistics rather than complete detailed information about all random access attempts. This partial action approach achieves sufficient measurement precision for time period estimation without the excessive complexity of reporting all possible parameters.
2Reliability
If comprehensive random access timing information is collected and reported, then reliability of RACH load prediction is improved, but loss of time for information collection and processing increases
Solution Approach 1:
The patent performs preliminary collection of critical timing information (first timestamp at initial preamble transmission, second timestamp at contention resolution message reception) during the random access procedure itself. By capturing these timestamps in advance as part of the normal random access flow, the system ensures reliable data for RACH load prediction without requiring additional time for separate information collection processes.
Solution Approach 2:
The user equipment automatically collects and stores the required timestamp information during its normal random access operations without requiring separate measurement or reporting procedures. The UE self-services by utilizing its existing random access timing data to provide the necessary information for base station predictions, eliminating additional time overhead.
Data Source
AI summary
A method and apparatus for reporting time information associated with random access procedure and back-off process are provided. The method applicable to a user equipment proposes to record time stamp information related to random access procedure. For instance, the UE records time information indicating when an initial random access preamble is transmitted and additional time information indicating when the UE succeeds in contention resolution. By reporting the time information, the UE allows a network to calculate work-period during which the UE performs a successful random access procedure.