Telecommunications system
First Claim
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1. A telecommunications system comprising:
- at least one host station and a plurality of subscriber units, said at least one host station being operable to transmit messages to said subscriber units, each said subscriber unit having a multiplicity of memory locations and means responsive to the detection of a message to store said message in a selected one of said memory locations, which can be accessed from said subscriber unit when required, said memory locations being provided in an integrated circuit module which is removably connected to said subscriber unit, said at least one host station being adapted to transmit a message coded in a specific format distinguished from other message formats used in the system, said message coded in said specific format comprising a read command, and said module having means for distinguishing a message coded in said specific format from said other message formats, means for decoding and storing a message coded in said specific format in a selected said memory location, reading means operable in response to a decoded message to instigate an action to be taken by the associated said subscriber unit, said action including the transmission of information requested by said read command.
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Abstract
In a telecommunications system such as a global mobile telephone network in which each subscriber unit includes a Subscriber Identity Module (SIM card), each SIM card has fixed memory locations, to which data can be addressed over the air. Some of the locations can not be overwritten from the subscriber unit but can be accessed therefrom on the entry of short simple codes, each associated with one of the locations. Further fixed memory locations can be read over the air only when the subscriber enters a personal identification number. Locking control files are used to control read/write access to the locations respectively.
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Citations
29 Claims
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1. A telecommunications system comprising:
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at least one host station and a plurality of subscriber units, said at least one host station being operable to transmit messages to said subscriber units, each said subscriber unit having a multiplicity of memory locations and means responsive to the detection of a message to store said message in a selected one of said memory locations, which can be accessed from said subscriber unit when required, said memory locations being provided in an integrated circuit module which is removably connected to said subscriber unit, said at least one host station being adapted to transmit a message coded in a specific format distinguished from other message formats used in the system, said message coded in said specific format comprising a read command, and said module having means for distinguishing a message coded in said specific format from said other message formats, means for decoding and storing a message coded in said specific format in a selected said memory location, reading means operable in response to a decoded message to instigate an action to be taken by the associated said subscriber unit, said action including the transmission of information requested by said read command. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29)
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14. A module for controlling a subscriber unit in a telecommunications system comprising at least one host station, said module being removably connectable to a transceiver of said subscriber unit and comprising:
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a multiplicity of memory locations, means responsive to the detection of a message transmitted from said at least one host station to store said message in a selected one of said memory locations, means for distinguishing a message coded in a specific format from other message formats used in said system, said message coded in said specific format comprising a read command, means for decoding and storing a message coded in said specific format in a selected said memory location, and reading means operable in response to a decoded message to instigate an action to be taken by said subscriber unit, said action including the transmission of information requested by said read command.
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23. A method of operating a telecommunications system in which at least one host station is operable to transmit messages to a plurality of subscriber units, comprising the steps of:
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providing a multiplicity of memory locations in each said subscriber unit said memory locations being disposed in an integrated circuit module removably connected to said subscriber unit, transmitting from said at least one host station to at least one of said subscriber units a message coded in a specific format distinguished from other message formats used in said system, said message comprising a read command, receiving said message at said at least one subscriber unit and rewriting said message to said integrated circuit module thereof, causing said integrated circuit module to distinguish said message coded in said specific format from said other message formats, routing said message coded in said specific format to decoding means, decoding said message coded in said specific format to produce a decoded message, storing said decoded message in a selected said memory location, reading said decoded message and, in response thereto, instigating an action to be taken by said at least one subscriber unit, said action including the transmission of information requested by said read command.
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Specification