MSC Event Notifications for Packet Network Resource Release
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Solution Overview
Problem
In hybrid wireless communication networks combining circuit switched and packet switched networks, mobile stations often fail to notify the packet switched network when switching to circuit switched networks, leading to unnecessary resource reservation and consumption, especially when they power down, causing inefficiencies in resource management and accounting.
Innovation Solution
Implementing a method where a Mobile Switching Center (MSC) sends event notifications to the packet switched network about the presence or power down status of mobile stations, allowing for the release of reserved resources and updating accounting records, thereby improving resource management and system throughput.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the mobile station switches to the circuit switched network without notifying the packet switched network, then the mobile station can perform circuit services (e.g., voice calls) seamlessly, but the packet switched network continues to reserve resources for the mobile station, causing unnecessary resource consumption
Solution Approach 1:
The MSC sends event notifications to the packet switched network when the mobile station switches to the circuit switched network. This feedback mechanism allows the packet switched network to release reserved resources promptly, eliminating unnecessary resource consumption while maintaining seamless circuit service access for the mobile station
Solution Approach 2:
The system establishes a preliminary arrangement where the MSC is configured to send event notifications to the packet switched network before resources are fully consumed. This preliminary notification allows the packet switched network to proactively release resources, preventing waste while ensuring the mobile station can immediately access circuit services
2Use of energy by moving object
If the mobile station powers down without returning to the packet switched network, then the mobile station conserves battery power, but the packet switched network continues to reserve resources and attempt data delivery, consuming network resources
Solution Approach 1:
When the mobile station powers down in the circuit switched network, the MSC detects this state and sends an event notification to the packet switched network. This feedback enables the packet switched network to release reserved resources and stop futile data delivery attempts, preventing network resource waste while allowing the mobile station to conserve battery power
3Reliability
If the packet switched network attempts to deliver data to a mobile station that is no longer present, then the network maintains reliable data delivery protocols, but unnecessary paging attempts are made consuming network resources
Solution Approach 1:
The MSC sends event notifications to the packet switched network before data delivery attempts are made. This preliminary action informs the packet switched network of the mobile station's absence, allowing it to skip futile paging attempts and release resources, thereby maintaining protocol integrity without wasting network resources
4Reliability
If the packet switched network releases resources only after deducing mobile station absence, then the network maintains resource availability for returning mobile stations, but resources are held too long reducing system throughput
Solution Approach 1:
The MSC sends event notifications to the packet switched network as soon as it detects the mobile station has switched to or powered down in the circuit switched network. This preliminary notification allows the packet switched network to release resources immediately rather than waiting for timeout-based deduction, significantly improving system throughput while maintaining reliability through proper accounting updates
Data Source
AI summary
When a mobile station requests circuit services notifications through a packet switched network, a mobile switching center sets a forwarding indicator. When the MSC detects an event indicative of a change in the status of the mobile station, the MSC sends an event notification to the packet switched network if the forwarding indicator is set to true. In the packet switched network, the base station can use the event notifications to manage communication resources used for packet data communications with the mobile station.