Subscriber Information Server Location Registration Optimization
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Solution Overview
Problem
In mobile communication systems where multiple schemes coexist, the subscriber information server sends and receives signals to and from the switch SGSN/MME every time a terminating-call signal is received, leading to increased network load and delays.
Innovation Solution
The mobile communication method involves switches from different schemes sending information during location registration to determine if all coverage areas have the same capability for packet switching, and the subscriber information server decides whether to inquire about service provision based on this information when a terminating-call signal is received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the subscriber information server sends status inquiry requests to the switch SGSN/MME every time a terminating-call signal is received, then the system can determine the current location and service capability of the mobile station, but the network load between the subscriber information server and the switch increases and processing delays occur
Solution Approach 1:
The system performs location registration processing in advance when the mobile station moves to a new area, storing the location information and service capability in the subscriber information server. This preliminary action eliminates the need for real-time status inquiry requests when a terminating-call signal is received, thereby reducing network load and processing delays while maintaining accurate location determination.
2Reliability
If the subscriber information server communicates with the switch SGSN/MME for every terminating-call signal, then the service capability information is kept updated, but the signal transmission load on the network increases
Solution Approach 1:
The service capability information is obtained and stored during location registration processing before any terminating-call signals are received. This preliminary acquisition of service capability information eliminates the need for repeated communication between the subscriber information server and the switch for each call, thereby maintaining reliable service capability accuracy while significantly reducing signal transmission volume.
3Measurement precision
If the system performs location registration every time the mobile station moves between coverage areas of different switches, then the location information is always current, but the processing time and network load increase
Solution Approach 1:
Location registration processing is performed in advance when the mobile station moves to a new coverage area, storing the location information in the subscriber information server. This preliminary registration ensures that when a terminating-call signal is received, the location information is already current and stored, eliminating the need for additional processing time while maintaining location information accuracy.
Data Source
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AI summary
A mobile communication method according to the present invention includes a step A in which, in location registration processing of a mobile station, an switch of a first communication scheme and an switch of a second communication scheme send a subscriber information server first information used to determine whether or not all coverage areas have a same capability of providing a telephony service by packet switching; and a step B in which, when a status inquiry request made upon receipt of a terminating-call signal destined for the mobile station is received from an application server, the subscriber information server determines based on the first information whether or not to make an inquiry at the switch of the first communication scheme or the switch of the second communication scheme about whether or not provision of the telephony service by packet switching is possible in an area where the mobile station is located.