MAC Entity RACH Failure Detection and 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 each mobile terminal.
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 allocation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the MAC entity waits to report RACH procedure failures to the upper layer, then the system can maintain simpler error handling procedures, but the detection delay increases and radio resources are used inefficiently
Solution Approach 1:
The patent implements preliminary action by having the MAC entity immediately detect and report RACH procedure failures to the upper layer as soon as they occur, rather than waiting for predetermined intervals or conditions. This immediate reporting mechanism eliminates detection delays and allows the system to take corrective action promptly, resolving the contradiction between fast failure detection and maintaining simple error handling procedures.
2Reliability
If the MAC entity immediately reports RACH procedure failures to the upper layer, then the reliability of random access procedures improves, but the system complexity increases due to additional reporting and correction mechanisms
Solution Approach 1:
The patent applies feedback by establishing a closed-loop error handling mechanism where the MAC entity continuously monitors RACH procedure outcomes, immediately reports failures to the upper layer, receives correction instructions, and re-attempts the procedure. This feedback loop significantly improves RACH procedure reliability by ensuring failures are promptly detected and corrected, while the standardized feedback mechanism keeps the added complexity manageable.
Solution Approach 2:
The patent implements self-service by enabling the MAC entity to autonomously detect RACH procedure failures and initiate reporting to the upper layer without requiring external monitoring or intervention. This self-detection capability improves reliability by ensuring failures are always caught promptly, while the autonomous nature of the MAC entity prevents the need for additional complex external error handling infrastructure.
3Productivity
If suboptimal parameter settings are used for each mobile terminal in RACH procedures, then the system configuration becomes simpler, but the efficiency of radio resource usage deteriorates
Solution Approach 1:
The patent applies local quality by enabling each MAC entity to have its own optimized RACH procedure parameters tailored to its specific conditions and requirements, rather than using uniform system-wide settings. This allows each mobile terminal to achieve optimal radio resource usage efficiency with locally optimized parameters, while the parameters themselves remain manageable through standardized configuration procedures.
Data Source
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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.