Mobile radio communication device
First Claim
1. The mobile radio communication system comprising:
- a base station; and
a mobile station connected by radio with the base station, and employing the time division multiple access system,wherein the mobile station has field intensity detection means that detects the field intensity of a signal transmitted by the base station,and synchronization establishment and maintenance control means whereby;
at the commencement of communication with the base station asynchronous reception is performed of signals from the base station, and synchronization establishment control is conducted whereby a synchronization establishment operation with the base station is performed under the condition that the field intensity detected by the field intensity detection means exceeds a first threshold value; and
, after establishment of synchronization with the base station by the synchronization establishment operation, a synchronization maintenance operation is conducted with the base station under the condition that the field intensity detected by the field intensity detection means exceeds a second threshold value smaller than the first threshold value.
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Accused Products
Abstract
This is a mobile radio communication device having a base station and a mobile station that is connected by radio with this base station using time division multiple access, in which stable connection with the base station can be achieved and subsequently stable radio communication can be conducted. In the initial period of communication with the base station, the mobile station receives the signal from the base station asynchronously; under the condition that the field intensity of a signal transmitted by the base station exceeds a first threshold value, synchronization establishment control is performed in which a synchronization establishment operation is performed with the base station; after establishment of synchronization with the base station by the synchronization establishment operation, synchronization maintenance operation with this base station is performed under the condition that the field intensity from this base station exceeds a second threshold value that is smaller than the first threshold value.
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Citations
20 Claims
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1. The mobile radio communication system comprising:
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a base station; and a mobile station connected by radio with the base station, and employing the time division multiple access system, wherein the mobile station has field intensity detection means that detects the field intensity of a signal transmitted by the base station, and synchronization establishment and maintenance control means whereby;
at the commencement of communication with the base station asynchronous reception is performed of signals from the base station, and synchronization establishment control is conducted whereby a synchronization establishment operation with the base station is performed under the condition that the field intensity detected by the field intensity detection means exceeds a first threshold value; and
, after establishment of synchronization with the base station by the synchronization establishment operation, a synchronization maintenance operation is conducted with the base station under the condition that the field intensity detected by the field intensity detection means exceeds a second threshold value smaller than the first threshold value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A mobile station which is connected by radio with a base station by using a time division multiple access system, comprising:
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field intensity detection means that detects field intensity of a signal transmitted by the base station; and synchronization establishment and maintenance control means that, on commencement of communication with the base station, receives the signal from the base station asynchronously, and, under the condition that the field intensity detected by the field intensity detection means exceeds a first threshold value, performs synchronization establishment control in which synchronization establishment operation is performed with the base station, and, after establishment of synchronization with the base station by the synchronization establishment operation, under the condition that the field intensity detected by the field intensity detection means exceeds a second threshold value smaller than the first threshold value, performs synchronization maintenance operation with the base station. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. Radio telecommunication apparatus for use in a radio telecommunication system, wherein the system encompasses a plurality of areas each having one base station which broadcasts first and second signals, comprising:
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first receiving means for receiving the first signal continuously; establish means for establishing a synchronization with the base station if the quality of the received first signal is higher than a first criterion; second receiving means, in response to the establish means, for receiving the second signal; maintain means for maintaining the established synchronization if the quality of the second received signal is higher than a second criterion which is smaller than the first criterion. - View Dependent Claims (19)
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20. Radio telecommunication apparatus for use in a radio telecommunication system, wherein the system encompasses a plurality of areas each having one base station, the apparatus comprising:
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first receiving means for receiving a plurality of first signals from a plurality of base stations; detecting means for detecting the quality of each first signal; determining means for determining at least one base station from which the detected quality of each signal is higher than a first criterion; select means for selecting one of the determined base stations broadcasting the signal whose detected quality is highest; establish means for establishing a synchronization with the selected base station; second receiving means, in response to the establish means, for receiving a second signal; and maintain means for maintaining the established synchronization if the quality of the second received signal is higher than a second criterion which is smaller than the first criterion.
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Specification