Mobile radio communication apparatus for selecting a high priority system at the time of turning power on
First Claim
1. A mobile radio communication apparatus for use in a mobile radio communication system which includes base stations, mobile radio communication apparatuses to be connected to the base stations over radio channels, and in which each of the base stations broadcasts a system ID number for identifying the base station, said apparatus comprising:
- first memory means for storing system ID numbers and priority data items, each item associated with each of the system ID numbers and representing priority assigned to each base station, so as to be used to seize one base station;
first seizing means for receiving the broadcast system ID number in accordance with the priority data item stored in said first memory means, for seizing the base station having the system ID number received, and for setting the apparatus in an idle state;
second memory means for storing the system ID number of the seized base station when a user operates the apparatus and inputs a turn-off instruction for turning off the apparatus, while the apparatus remaining the idle state; and
third memory means for storing channel numbers in the order of acquisition indices;
second seizing means for receiving a control signal using the stored channel number in accordance with the acquisition indices stored in said third memory means; and
control means for turning off the apparatus in response to the turn-off instruction, for determining whether a system ID number that the apparatus receives by referring to the contents of said second memory is stored in the first memory means, in response to the turn-on instruction, for determining whether the apparatus receives the system ID number of higher priority than the system ID number stored in said second memory means when the received system ID number is stored in the first memory means, for seizing the base station having the system ID number of higher priority than the system ID number stored in said second memory means and setting the apparatus in the idle state when the apparatus receives the system ID number of higher priority, for detecting a system ID number from a received control signal having a received strength equal to or greater than a prescribed value when the received system ID number is not stored in the first memory means, and for seizing the base station having the detected system ID number and setting the apparatus in the idle state when the apparatus receives the detected system ID numbers, wherein said control means operates such that a geographical area into which the apparatus has moved is identified, said first seizing means receives one of the broadcast system ID numbers in accordance with the geographical area identified, and seizes a base station having the one of the system ID number received by said first seizing means and sets the apparatus in the idle state.
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Accused Products
Abstract
Disclosed herein is a mobile radio communication apparatus, wherein priority data items representing the priorities of base stations are stored. The SID of the base station seized when the apparatus was turned off last is stored in the apparatus, too. When the apparatus is turned on, it may identify a base station of higher priority than the base station it seized when it was turned off. In this case, the apparatus seizes the base station of higher priority and goes into an idle state. Thus, the apparatus that can seize a base station of high priority even if it seized a base station of low priority when it was turned off last and if it now exits in an area formed by the overlapping of the two service areas in which the low-priority base station and the high-priority base station operate, respectively.
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Citations
5 Claims
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1. A mobile radio communication apparatus for use in a mobile radio communication system which includes base stations, mobile radio communication apparatuses to be connected to the base stations over radio channels, and in which each of the base stations broadcasts a system ID number for identifying the base station, said apparatus comprising:
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first memory means for storing system ID numbers and priority data items, each item associated with each of the system ID numbers and representing priority assigned to each base station, so as to be used to seize one base station;
first seizing means for receiving the broadcast system ID number in accordance with the priority data item stored in said first memory means, for seizing the base station having the system ID number received, and for setting the apparatus in an idle state;
second memory means for storing the system ID number of the seized base station when a user operates the apparatus and inputs a turn-off instruction for turning off the apparatus, while the apparatus remaining the idle state; and
third memory means for storing channel numbers in the order of acquisition indices;
second seizing means for receiving a control signal using the stored channel number in accordance with the acquisition indices stored in said third memory means; and
control means for turning off the apparatus in response to the turn-off instruction, for determining whether a system ID number that the apparatus receives by referring to the contents of said second memory is stored in the first memory means, in response to the turn-on instruction, for determining whether the apparatus receives the system ID number of higher priority than the system ID number stored in said second memory means when the received system ID number is stored in the first memory means, for seizing the base station having the system ID number of higher priority than the system ID number stored in said second memory means and setting the apparatus in the idle state when the apparatus receives the system ID number of higher priority, for detecting a system ID number from a received control signal having a received strength equal to or greater than a prescribed value when the received system ID number is not stored in the first memory means, and for seizing the base station having the detected system ID number and setting the apparatus in the idle state when the apparatus receives the detected system ID numbers, wherein said control means operates such that a geographical area into which the apparatus has moved is identified, said first seizing means receives one of the broadcast system ID numbers in accordance with the geographical area identified, and seizes a base station having the one of the system ID number received by said first seizing means and sets the apparatus in the idle state.
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2. A mobile radio communication apparatus which is connectable to base stations over radio channels, each of the base stations broadcasting a system ID for identifying the base station, said apparatus comprising:
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a first memory for storing a system ID and a frequency of a base station acquired by the apparatus when the apparatus is switched off;
first means for acquiring the acquired base station using the stored frequency when the apparatus is switched on;
a second memory for storing system IDs with priority, the priority being assigned to each base station;
first means for determining whether the system ID of the acquired base station is stored in the second memory;
a third memory for storing system ID and a frequency of a home base station;
second means for acquiring the home base station using the frequency stored in the third memory when the system ID of the acquired base station is not stored in the second memory;
a forth memory for storing frequencies in the order of acquisition indices;
means for receiving a control signal using the frequencies stored in the forth memory in accordance with the stored acquisition indices when the apparatus does not acquire the home base station;
means for obtaining a system ID from the received control signal of which received strength is greater than a prescribed value;
second means for determining whether a system ID associated with a priority higher than that of the obtained system ID is stored in the second memory; and
third means for acquiring a base station of a system ID associated with the higher priority when the system ID associated with the higher priority is stored in the second memory. - View Dependent Claims (3)
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4. Method in a mobile radio communication apparatus for acquiring a base station in a mobile radio communication system in which each base station broadcasts a system ID for identifying the base station, said method comprising:
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storing in a first memory a system ID and a frequency of a base station acquired by the apparatus when the apparatus is switched off;
acquiring the acquired base station using the stored frequency when the apparatus is switched on;
storing system IDs with priority in a second memory, the priority being assigned to each base station;
determining whether the system ID of the acquired base station is stored in the second memory;
storing system ID and a frequency of a home base station in a third memory;
acquiring the home base station using the frequency stored in the third memory when the system ID of the acquired base station is not stored in the second memory;
storing frequencies in the order of acquisition indices in a forth memory;
receiving a control signal using the frequencies stored in the forth memory in accordance with the stored acquisition indices when the apparatus does not acquire the home base station;
obtaining a system ID from the received control signal of which received strength is greater than a prescribed value;
determining whether a system ID associated with a priority higher than that of the obtained system ID is stored in the second memory; and
acquiring a base station of a system ID associated with the higher priority when the system ID associated with the higher priority is stored in the second memory. - View Dependent Claims (5)
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Specification