Multi-Carrier Random Access Failure Handling via Dynamic Carrier Switching
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Solution Overview
Problem
In multi-carrier wireless communication systems, random access failures across multiple carrier frequencies are not effectively coordinated, leading to inefficient resource management and increased power consumption due to repeated failed attempts.
Innovation Solution
A method and apparatus for handling random access failures by retrying the procedure on a carrier frequency and stopping the retry when it fails, with a controller module managing the Media Access Control (MAC) layer to proactively stop the procedure and adjust carrier frequency priorities, and a cellular station transmitting messages to the mobile device to halt retries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile communication device continuously retries the random access procedure on multiple carrier frequencies, then the probability of successful access may improve, but the power consumption increases and resource management efficiency deteriorates
Solution Approach 1:
The system performs preliminary actions by configuring multiple carrier frequencies and preparing random access procedures in advance. When a failure occurs, the device has pre-configured alternative carriers ready to switch to, avoiding the need for continuous retries on the same failed carrier and reducing unnecessary power consumption.
Solution Approach 2:
The random access procedure is made dynamic through carrier frequency switching. When random access fails on one carrier, the system dynamically transitions to another configured carrier frequency, adapting the access strategy based on real-time conditions rather than persisting with static retry attempts on the same carrier.
2Reliability
If the mobile communication device continuously retries the random access procedure on multiple carrier frequencies, then the probability of successful access may improve, but the resource management efficiency deteriorates
Solution Approach 1:
The network side performs preliminary configuration of multiple carrier frequencies and random access parameters before the device needs to access. This pre-configuration enables efficient resource utilization by having ready-made alternative access paths, avoiding wasteful repeated attempts on failed carriers and improving overall resource management efficiency.
Solution Approach 2:
The system implements dynamic carrier switching mechanisms that allow the device to transition between different carrier frequencies based on random access outcomes. This dynamic behavior improves resource management by directing access attempts toward available carriers rather than consuming resources on continuously failing attempts.
3Reliability
If multiple random access procedures are concurrently performed on multiple carrier frequencies, then the access reliability improves, but the device complexity increases
Solution Approach 1:
The random access procedure is segmented across multiple carrier frequencies, with each carrier handling a separate access attempt. This segmentation allows the system to distribute the complexity of multi-carrier coordination, managing each carrier's random access procedure independently while maintaining overall access reliability through the diversity of multiple carriers.
Data Source
AI summary
A mobile communication device with a wireless module and a controller module is provided for handling random access failures in a multi-carrier system. The wireless module performs wireless transceiving to and from a cellular station. The controller module performs operations of a Media Access Control (MAC) layer. The operations includes: retrying a random access procedure on a carrier frequency with the cellular station via the wireless module, and stopping the retry of the random access procedure in response to the retry of the random access procedure being failed or receiving a message from the cellular station via the wireless module.