Relay MSC Group Call Setup Resource Management
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Solution Overview
Problem
In the 3GPP protocol, when a service subscriber initiates a group call in a Relay MSC, the Anchor MSC cannot identify the Relay MSC where the calling service subscriber is located if the group call setup fails, leading to resource wastage as the Anchor MSC cannot remove the call in a timely manner.
Innovation Solution
The Relay MSC constructs a call setup message using its own number as the calling number, allowing the Anchor MSC to identify the Relay MSC where the calling service subscriber is located, enabling timely removal of failed group calls and preventing resource wastage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Relay MSC uses a generic calling number in the call setup message, then the message format remains simple and compatible with standard protocols, but the Anchor MSC cannot identify which Relay MSC initiated the group call, leading to resource wastage when call setup fails
Solution Approach 1:
The patent applies preliminary action by having the Relay MSC insert its own number as the calling number in the call setup message before sending it to the Anchor MSC. This preliminary identification information is embedded in advance, enabling the Anchor MSC to subsequently identify the originating Relay MSC and efficiently manage resources when call setup fails, without requiring complex additional signaling mechanisms.
2Loss of time
If the Anchor MSC implements complex identification mechanisms to track Relay MSC locations, then it can identify failed calls and release resources timely, but the system complexity and implementation difficulty increase significantly
Solution Approach 1:
The patent applies self-service by having the Relay MSC automatically insert its own identification number into the call setup message without requiring external assistance or complex tracking mechanisms at the Anchor MSC. The Relay MSC serves itself by providing the necessary identification information, thereby simplifying the Anchor MSC's task to merely reading the calling number rather than implementing complex identification algorithms or maintaining additional state information.
3Productivity
If the Relay MSC inserts its number as the calling number in the call setup message, then the Anchor MSC can identify and remove failed calls efficiently, but the call setup message format deviates from standard protocol specifications
Solution Approach 1:
The patent applies parameter changes by modifying the calling number parameter in the call setup message from a generic value to the specific Relay MSC number. This parameter change enables the Anchor MSC to identify the originating Relay MSC and efficiently manage call setup and teardown operations, improving productivity while maintaining compatibility with existing message structure and protocol processing logic.
Data Source
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AI summary
The embodiments disclose a method for identifying a Relay MSC, and a method and a device for group calling, wherein, when a calling service subscriber initiates a group call in a Relay MSC, the Relay MSC constructs a call setup message by using a Relay MSC number as a calling number and sends the call setup message to an Anchor MSC. After the Anchor MSC receives the call setup message, it identifies the Relay MSC where the calling service subscriber is located according to the calling number in the message. During the process of continuing to setup the group call, if the Relay MSC fails to set up the group call, the Anchor MSC removes the call which is being set up. It may be avoided to set up an unreasonable group call and to waste system resources.