Subscribers database proofing using a checksum in a telecommunications system
First Claim
1. A method in a second mobile services switching center for updating location information of a mobile station when said mobile station has moved from an area controlled by a first mobile services switching center to an area controlled by a second mobile services switching center, said method comprising:
- adding said mobile station to a second mobile services switching center database in response to said mobile station registering with said second mobile services switching center;
calculating a second mobile services switching center checksum so as to include the said mobile station;
sending a home location register checksum to said second mobile services switching center from a home location register;
comparing said home location register checksum and said second mobile services switching center checksum; and
sending a location registration signal from said second mobile services switching center to said mobile station.
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Accused Products
Abstract
The present invention is a method and system for updating location information of mobile stations. A mobile station moves from an area controlled by a first mobile services switching center (MSC) to an area controlled by a second MSC. The mobile station then registers with the second MSC, and, in response, the mobile station is added to a second MSC database. The second MSC recalculates a second MSC checksum to include the newly registered mobile station. Next, the HLR sends an HLR checksum to the second MSC. The second MSC compares the HLR checksum and the second MSC checksum. If the checksums are equal, then the second MSC sends the location registration signal to the mobile station. If the checksums are unequal, then the second MSC sends an error signal to the HLR, and also sets the second MSC database equal to a previous correct database. Next, the HLR sends all logged erasures to the second MSC. The second MSC then appropriately subtracts and adds each erased and newly registered mobile station to the database of the second MSC and recalculates the second MSC checksum until both checksums are equal.
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Citations
5 Claims
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1. A method in a second mobile services switching center for updating location information of a mobile station when said mobile station has moved from an area controlled by a first mobile services switching center to an area controlled by a second mobile services switching center, said method comprising:
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adding said mobile station to a second mobile services switching center database in response to said mobile station registering with said second mobile services switching center;
calculating a second mobile services switching center checksum so as to include the said mobile station;
sending a home location register checksum to said second mobile services switching center from a home location register;
comparing said home location register checksum and said second mobile services switching center checksum; and
sending a location registration signal from said second mobile services switching center to said mobile station. - View Dependent Claims (2)
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3. A method in an first mobile services switching center for updating location information of a mobile station, said method comprising:
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sending a home location register checksum from a home location register to said first mobile services switching center;
subtracting said mobile station from a first mobile services switching center database;
recalculating a first mobile services switching center checksum to account for the subtracted mobile station;
sending an erasure acknowledge signal from said first mobile services switching center to said home location register; and
comparing said first mobile services switching center checksum to said home location register checksum. - View Dependent Claims (4)
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5. A system for updating location information of a mobile station in a second mobile services switching center when said mobile station moves from an area controlled by a first mobile services switching center to an area controlled by a second mobile services switching center, said system comprising:
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a first mobile services switching center for communicating with said mobile station and comprising;
a compare checksum procedure; and
a means for calculating a checksum stored in said first mobile services switching center;
a second mobile services switching center for communicating with said mobile station and comprising;
a compare checksum procedure; and
a means for calculating a checksum stored in said second mobile services switching center; and
a home location register for providing data to a plurality of mobile services switching centers.
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Specification