Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
1998-04-21
2001-02-20
Le, Thanh Cong (Department: 2689)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S039000, C455S059000, C455S161100
Reexamination Certificate
active
06192224
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a multi-band mobile telecommunications station for use in a multiple network environment, for example an environment in which there is a network of terrestrial base stations and another network of orbiting satellite stations.
2. Description of the Related Art
The mobile station needs to be able to establish when it is in the coverage zone of any terrestrial base station or orbiting satellite station, but the operations required to enable the mobile station to search for such stations are power consuming.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide a mobile telecommunications station which overcomes this problem.
A mobile telecommunications station in accordance with the invention includes a radio receiver capable of operating in a plurality of different frequency bands used by different networks, network preference data storage means for storing data which identifies a level of priority for each network, at least one of the networks being a preferred network, and a search control means determining the search frequency at which each network is searched in accordance with the preference data.
The search control means preferably varies the search strategy according to the network stations found in a previous search. For example, in GSM/Satellite dual mode mobile station, the search control means would normally reduce the frequency of satellite searches to a minimum. When the mobile station was not in the coverage zone of any GSM or Satellite base station, the frequency of both satellite and GSM scans would be increased. When the mobile station was not in the coverage zone of any GSM base station, but still in the coverage zone of a satellite network, the frequency of GSM scans would not be reduced.
The above and other objects, features and advantages of the present invention will become apparent from the following description with reference to the accompanying drawings which illustrate examples of the present invention.
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Grayson Mark
Jouin Christophe M. J.
Cong Le Thanh
NEC Corporation
Sughrue Mion Zinn Macpeak & Seas, PLLC
Tran Pablo
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