MSC Pool Reset Handling via Targeted Release and Pause
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Solution Overview
Problem
In MSC Pool networking, the reset message transmission after an MSC failure leads to abnormal release of services from other MSCs and inconsistencies in connection states between MSC and BSC, affecting Quality of Service (QoS) by causing deadlock and incorrect allocation of connection reference numbers.
Innovation Solution
The Serving Node Selection Function (SNSF) temporarily stops transmitting service messages to the MSC after receiving a reset message and resumes after a preset duration, ensuring complete release of connection resources between BSC and MSC, and modifies the reset message with MSC identifiers to accurately release corresponding connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MSC transmits a global reset message to the BSC after failure removal, then the connection resources on the BSC are released, but all services distributed to other normal MSCs are abnormally released
Solution Approach 1:
The patent segments the reset message transmission by introducing MSC identifier information. Instead of transmitting a global reset message to all BSCs, the reset message is targeted to specific BSCs based on their association with the failed MSC. This is achieved by the BSC determining whether to transmit the reset message based on whether it is connected to the failed MSC, thereby releasing only the connection resources associated with the failed MSC while preserving services distributed to other normal MSCs.
Solution Approach 2:
The patent applies local quality by making the reset message transmission conditional and localized. Each BSC evaluates its own connection status with the failed MSC and transmits the reset message only if it has connections to release. This localized approach ensures that only the specific connection resources affected by the MSC failure are released, while other services continue to operate normally on other MSCs.
2Reliability
If the SCCP connection resource is released on one side while the other side still occupies the resource, then the connection deadlock is avoided, but the connection state inconsistency occurs
Solution Approach 1:
The patent implements feedback mechanisms through acknowledgment messages. When the BSC releases connection resources, it transmits a reset acknowledgment message to the MSC to confirm the release. Similarly, when the MSC releases resources, it notifies the BSC. This bidirectional feedback ensures that both sides are aware of the resource release status, maintaining connection state consistency while avoiding deadlocks.
Solution Approach 2:
The patent applies preliminary action by establishing resource release procedures before potential deadlock situations occur. The BSC and MSC are configured to proactively release connection resources when failure conditions are detected, and to notify each other of the release status. This preliminary resource management prevents the occurrence of connection deadlocks and maintains state consistency.
3Reliability
If the T(iar) timer duration is extended to ensure resource release, then the connection resource release is complete, but the new service allocation is delayed
Solution Approach 1:
The patent applies preliminary action by proactively releasing connection resources immediately when failure conditions are detected, rather than waiting for timer expiration. The BSC determines whether to transmit a reset message based on failure detection, and resources are released promptly with acknowledgment exchanged between BSC and MSC. This eliminates the need for extended timer durations and prevents service allocation delays.
Solution Approach 2:
The patent enables self-service through the autonomous failure detection and resource release capability of the BSC. The BSC independently determines when to transmit reset messages based on its own failure detection mechanisms, and manages its own connection resource release without relying on extended timers. This self-managed resource release ensures both completeness and timeliness.
Data Source
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AI summary
A method and an apparatus for processing release of connection resources are provided. The method includes: stopping transmitting a service message to a Mobile Switch Center (MSC) in a first preset duration after receiving a reset message transmitted by the MSC, and restoring transmission of the service message to the MSC after the first preset duration, where release of connection resources between a Base Station Controller (BSC) and the MSC is ensured to be completed in the first preset duration. Through the method and the apparatus for processing the release of the connection resources, after the MSC transmits the reset message, it is ensured that the services of other MSCs are not affected and also the connection corresponding to the MSC transmitting the reset message on the BSC is released, so new services are not affected accordingly, thereby improving Quality of Service (QoS) of the services.