GSM Mobile Unit Disconnect Procedure for Channel Failure
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Solution Overview
Problem
In GSM voice calls, there is a significant delay in detecting and addressing downlink channel failures due to the combination of mobile unit and base station timeout procedures, which prolongs the time before users are notified of a dropped call and network resources are reallocated.
Innovation Solution
A method where a mobile unit detects downlink channel failures and sends disconnect messages to the base station, including prediction disconnect messages based on the likelihood of successful decoding of slow associated control channel blocks, to bypass the base station's timeout procedure, thereby reducing the time to tear down the communication and reallocate resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the mobile unit uses a timeout procedure to detect DL channel failure, then the mobile unit can determine when to stop transmitting, but the base station timeout procedure causes a significant delay in detecting and notifying call failure
Solution Approach 1:
The mobile unit performs preliminary action by proactively sending a disconnect message to the base station upon detecting DL channel failure, before the base station's timeout procedure completes. This preliminary notification eliminates the need for the base station to wait for its timeout timer to expire, significantly reducing the overall failure detection time.
2Reliability
If the base station implements a timeout procedure to detect transmission cessation, then the base station can identify when the mobile unit stops transmitting, but the combined timeout procedures at both ends create unnecessary delay
Solution Approach 1:
The mobile unit provides feedback to the base station by sending a disconnect message that explicitly notifies the base station of the DL channel failure. This feedback mechanism allows the base station to immediately respond and reallocate resources without waiting for its timeout procedure to complete, thereby improving productivity while maintaining reliable detection.
3Stability of the object's composition
If the mobile unit waits for the base station timeout procedure to complete before initiating disconnect, then the disconnect timing is coordinated, but the overall disconnect time is significantly prolonged
Solution Approach 1:
The mobile unit takes preliminary action by sending the disconnect message as soon as it detects DL channel failure, before the base station's timeout procedure completes. This approach maintains coordination stability while significantly reducing the overall disconnect duration, as the base station can immediately process the disconnect request without waiting for its timeout timer.
Data Source
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AI summary
A method (300) and system (100) for a disconnect procedure. In one arrangement, the method (300) can include the step of - during a call at a mobile unit (120) operating in accordance with the GSM standard - detecting (302) a downlink channel failure between the mobile unit (120) and a base station (110). The method (300) can also include the step of - in response to the downlink channel failure detection - signaling (304) the base station (110) from the mobile unit (120) with a disconnect message. The disconnect message can be configured to prevent the base station (110) from unnecessarily undergoing a base station timeout procedure.