RACH Failure Detection via Immediate MAC-to-RRC Reporting
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Solution Overview
Problem
Existing technologies fail to properly detect failures in random access procedures, leading to delays and inefficient use of radio resources in wireless communication systems, particularly in LTE systems, due to suboptimal parameter settings for RACH procedures.
Innovation Solution
Implementing a method where the MAC entity immediately reports RACH procedure failures to the upper layer (RRC entity), allowing for error correction and re-attempting the RACH procedure without waiting, thereby reducing delays and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MAC entity waits to report RACH procedure failures to the upper layer, then the system can process failures in a batch manner, but this causes delays and inefficient use of radio resources
Solution Approach 1:
The patent applies preliminary action by having the MAC entity immediately detect and report RACH procedure failures to the upper layer as they occur, rather than waiting for a batch processing opportunity. This immediate reporting enables the system to take corrective actions promptly, reducing the time loss while maintaining reliable failure detection.
2Device complexity
If the RACH procedure is performed multiple times without immediate failure reporting, then the system can maintain simpler error handling, but this results in longer delays and reduced productivity
Solution Approach 1:
The patent implements feedback by establishing an immediate reporting mechanism where the MAC entity notifies the upper layer of RACH procedure failures. This feedback loop enables the system to respond to failures in real-time, improving productivity while the feedback mechanism itself remains integrated into the existing protocol structure, avoiding excessive complexity.
3Device complexity
If failure reporting is delayed until the end of a time window, then the system can simplify timing management, but this increases the loss of time and reduces the ability to correct errors promptly
Solution Approach 1:
The patent applies preliminary action by immediately detecting and reporting failures as they occur within the time window, rather than waiting for the window to end. This approach reduces time loss while the reporting mechanism is triggered at the appropriate moment within the existing timing framework, avoiding excessive complexity in timing management.
Data Source
AI summary
A method of performing a random access channel (RACH) procedure between a mobile terminal and a network includes the steps of detecting whether a random access response (RAR) is received from the network within a certain time period, the RAR including information about a random access channel (RACH) preamble transmitted to the network; and if the RAR is not received within the certain time period or if the information about the transmitted RACH preamble included in the RAR does not match the transmitted RACH preamble, performing a first procedure to detect failures in the RACH procedure; and if the RAR is received within the certain time period and if the information about the transmitted RACH preamble included in the RAR matches the transmitted RACH preamble, performing a second procedure to detect failures in the RACH procedure.