Media Gateway Selection in Mobile Switching Center Pools
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Solution Overview
Problem
In mobile switching center pool architecture, the random allocation of media gateways for call routing leads to inefficient call traversal, as calls often pass through intermediate gateways even when the called and calling parties are connected to the same media gateway, increasing network resource usage and reducing efficiency.
Innovation Solution
Optimizing media gateway selection by choosing a geographically close or same media gateway as the originating point for call routing, utilizing a terminating media gateway selection module within the MSC server that employs SIP messages and internal routing tables to minimize the path length of bearer traffic.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If random allocation of media gateways is used for call routing, then any media gateway can be selected, but calls traverse through intermediate gateways increasing network resource usage
Solution Approach 1:
The patent applies local quality by selecting media gateways based on their geographic location relative to the calling and called parties. Instead of random selection, the system chooses gateways that are locally optimal - specifically, gateways that are geographically close to both parties or the same gateway serving both parties, thereby minimizing traversal distance and network resource consumption while maintaining selection flexibility
2Reliability
If calls route through intermediate media gateways, then connectivity is maintained, but the number of gateway nodes increases reducing efficiency
Solution Approach 1:
The patent applies preliminary action by pre-establishing routing tables in media gateways that contain optimized path information before calls are routed. The terminating gateway selection module uses these pre-computed routing tables to directly determine the optimal terminating gateway, eliminating the need for calls to traverse through intermediate gateways and thereby improving routing efficiency while maintaining connectivity
3Productivity
If same media gateway is used for both calling and called parties, then call traffic is localized, but this option is not always available with random allocation
Solution Approach 1:
The patent applies feedback by implementing a terminating gateway selection module that receives information about the calling party's media gateway and uses this feedback to make an informed selection of the terminating gateway. The module queries routing tables with the originating gateway information and selects the optimal terminating gateway based on this feedback, thereby achieving traffic localization when possible while maintaining adaptability to various network conditions
Data Source
AI summary
A system and method to allow call traffic localization within a mobile switching center server pool (MSS pool) or between MSS pools, provides a trunk group identifier mapped to an originating media gateway. An originating mobile switching center server (MSC server) initiates a call session with a terminating MSC server by sending a session initiation protocol (SIP) message that includes a trunk group identifier mapped to an originating media gateway identity. The terminating MSC server examines the mapping received in the SIP message, and uses the trunk group identifier to select a terminating media gateway for call routing to realize call traffic localization.