Cellular radiotelephone system, a method of protecting the data base of a visitor location register against saturation
First Claim
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1. In a cellular radiotelephone system, a method of protecting the data base of a visitor location register from saturation, the method comprising the steps of:
- allocating a temporary mobile identity word to each mobile that announces its presence for the first time in a geographical zone served by the register, said word comprising a first field specifying an internal reference for an n-tuplet in a table of the data base, and a second field which is a function of the instant at which the temporary identify word is allocated;
writing each temporary identity word in the n-tuplet designated by its first field;
releasing said n-tuplet when the mobile demonstrates its presence in a zone corresponding to another register;
allocating a new temporary identify word to a mobile each time said mobile again announces its presence in a zone served by the register after a silence of duration greater than a threshold value, with the first field thereof remaining unchanged while the second field thereof being a function of the instant at which the mobile again announces its presence;
writing the new temporary identity word in the n-tuplet designated by the first field; and
periodically releasing from the data base those n-tuplets which correspond to temporary identify words whose second fields correspond to instants earlier than a first threshold instant;
the method being characterized in that it further comprises, whenever the data base is filled close to saturation, in releasing n-tuplets from the data base corresponding to temporary identify words whose second fields correspond to instants earlier than a second threshold instant which is more recent than the first threshold instant.
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Abstract
In a cellular radiotelephone system, the data base of a visitor location register is protected from saturation by releasing n-tuplets from the data base corresponding to those temporary mobile identity words corresponding to mobiles which announced their presence more than some predetermined time earlier, and by changing the predetermined time when the register nears saturation.
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Citations
6 Claims
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1. In a cellular radiotelephone system, a method of protecting the data base of a visitor location register from saturation, the method comprising the steps of:
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allocating a temporary mobile identity word to each mobile that announces its presence for the first time in a geographical zone served by the register, said word comprising a first field specifying an internal reference for an n-tuplet in a table of the data base, and a second field which is a function of the instant at which the temporary identify word is allocated; writing each temporary identity word in the n-tuplet designated by its first field; releasing said n-tuplet when the mobile demonstrates its presence in a zone corresponding to another register; allocating a new temporary identify word to a mobile each time said mobile again announces its presence in a zone served by the register after a silence of duration greater than a threshold value, with the first field thereof remaining unchanged while the second field thereof being a function of the instant at which the mobile again announces its presence; writing the new temporary identity word in the n-tuplet designated by the first field; and periodically releasing from the data base those n-tuplets which correspond to temporary identify words whose second fields correspond to instants earlier than a first threshold instant; the method being characterized in that it further comprises, whenever the data base is filled close to saturation, in releasing n-tuplets from the data base corresponding to temporary identify words whose second fields correspond to instants earlier than a second threshold instant which is more recent than the first threshold instant. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification