Mobile radio communication terminal device with base station searching function
First Claim
1. A mobile radio communication terminal device for use in a cellular mobile radio communication system where base stations are distributed over a service area, the base stations form their respective radio areas, and a radio channel connects the mobile radio communication terminal device and a base station in each of the radio areas, comprising:
- history information storage means for storing information relating to past handovers representing base stations connected to the mobile radio communication terminal device as handover history information;
update means for updating the handover history information stored in said history information storage means each time handover is performed; and
state determining means for determining whether the mobile radio communication terminal device is in a steady state or a moving state, on the basis of the handover history information stored in said history information storage means.
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Accused Products
Abstract
The history of handover destinations is stored in a handover history storage section. Each time handover is effected, the history of past five consecutive handover destinations including the present handover destination is determined on the basis of the handover history storage section. When any of the handover destinations has been stored in the handover history storage section, the mobile station recognizes its state to be in the steady state and otherwise to be in the moving state. On the basis of the result of the recognition, the mobile station selects a search algorithm suitable for each state and searches for a base station. This enables the best base station to be searched for according to the state of the mobile station, thereby reducing the power consumption in the wait state, which lengthens the battery service life.
102 Citations
18 Claims
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1. A mobile radio communication terminal device for use in a cellular mobile radio communication system where base stations are distributed over a service area, the base stations form their respective radio areas, and a radio channel connects the mobile radio communication terminal device and a base station in each of the radio areas, comprising:
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history information storage means for storing information relating to past handovers representing base stations connected to the mobile radio communication terminal device as handover history information;
update means for updating the handover history information stored in said history information storage means each time handover is performed; and
state determining means for determining whether the mobile radio communication terminal device is in a steady state or a moving state, on the basis of the handover history information stored in said history information storage means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A mobile communication terminal device for use in a cellular mobile radio communication system where base stations are distributed over a service area, the base stations form their respective radio areas, the mobile communication terminal device and a base station are connected by radio in each of the radio areas, comprising:
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history information storage means for storing information relating to past handovers representing base stations connected to the mobile radio communication terminal device as handover history information;
means for updating the handover history information stored in said history information storage means each time handover is performed; and
base station search control means for controlling the operation of searching for said base stations on the basis of the handover history information stored in said history information storage means.
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17. A mobile terminal, coupled through a radio channel to at least one base station, said mobile terminal comprising:
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a memory that stores history information relating to handovers between the mobile terminal and at least one base station;
first logic that updates the handover history information stored in the memory each time handover is performed; and
second logic that determines whether the mobile terminal is in a steady state or a moving state, using the handover history information.
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18. A communication system, comprising:
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one or more base stations distributed over a service area; and
a mobile terminal, coupled through a radio channel to at least one of the base stations, said mobile terminal including a memory that stores information relating to handovers between the mobile terminal and at least one base station, first logic that updates the handover history information stored in the memory each time handover is performed, and second logic that controls the operation of searching for the at least one base station using the handover history information.
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Specification