Inter-MSC Handover Media Gateway Selection
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Solution Overview
Problem
Current call handover procedures between call control nodes in telecommunication networks lack information about user plane resources seized by the anchor MSC, leading to suboptimal media gateway selection during inter-MSC handovers, particularly when a mobile terminal moves between UMTS and GSM networks.
Innovation Solution
Incorporating identification information of the switching points seized by the first call control node into a handover request message, allowing the second call control node to select a switching point that matches the configuration of the first node, optimizing resource usage by ensuring consistent media gateway selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the handover request message does not include identification information of switching points, then the message format remains simple and compatibility is maintained, but the second call control node cannot optimize media gateway selection during inter-MSC handover
Solution Approach 1:
The first call control node performs preliminary action by including the identification information of the seized switching point in the handover request message before the second call control node makes its selection. This allows the second node to proactively optimize media gateway selection based on existing resource information rather than making selections in ignorance of current network state.
2Productivity
If different media gateways are used by anchor MSC and non-anchor MSC during handover, then each node can independently select optimal resources, but the user plane connection requires additional interface establishment between different media gateway nodes
Solution Approach 1:
The invention merges the control of media gateway selection by having the second call control node base its selection on the identification information provided by the first call control node. This can lead to both nodes controlling the same media gateway, thereby merging the resource usage and eliminating the need for additional user plane interface establishment between different media gateway nodes.
3Loss of energy
If the handover request message includes identification information of switching points, then the second call control node can select matching switching points for optimized resource usage, but the message format and processing complexity increase
Solution Approach 1:
The second call control node uses the identification information from the handover request message as a reference or copy to make its switching point selection. Instead of performing complex independent optimization calculations, it can directly utilize or adapt the first node's switching point identification, simplifying its decision-making process while still achieving optimized resource usage.
Data Source
AI summary
The invention relates to a method for handing over a mobile entity related call from a first call control node to a second call control node, wherein identification information of a switching point seized by the first call control node is contained in a handover request message, the second call control node selecting a switching point for the call to be handed over based on the identification information contained in the handover request message.