Wireless communication systems
First Claim
1. A wireless communication system comprising a base station and at least one terminal, characterized in that said base station is provided with a function of transmitting a wireless signal aimed at alerting said terminal to its presence, said terminal performs reception with a communication channel for a signal alerting to the presence of said base station and is provided with a function of measuring the electric power of the received signal of said communication channel, and said base station is present within the communication range of said terminal in case the measured result of the received power is greater than a prescribed value.
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Accused Products
Abstract
In a wireless communication system having a base station and a terminal, it is important to extend the operating life of the terminal in the case of using a battery as the power supply of the terminal. Particularly in the case where a state in which a base station is not present in the range within which the terminal can communicate lasts long, the reduction of the electric power consumption during the standby of the terminal becomes an issue. The terminal monitors the received signal power strength of a signal transmitted by the base station. When the power strength exceeds a prescribed value, it is considered that the base station is present and the base station performs operations for carrying out communication with the base station.
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Citations
15 Claims
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1. A wireless communication system comprising a base station and at least one terminal, characterized in that
said base station is provided with a function of transmitting a wireless signal aimed at alerting said terminal to its presence, said terminal performs reception with a communication channel for a signal alerting to the presence of said base station and is provided with a function of measuring the electric power of the received signal of said communication channel, and said base station is present within the communication range of said terminal in case the measured result of the received power is greater than a prescribed value.
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6. A terminal in a wireless communication system comprising a base station and at least one terminal, characterized by
having a first receiver part detecting a prescribed communication channel, a second receiver part performing signal processing of the received signal in said detected prescribed communication channel, and a power supply part providing electric power selectively to said first and second receiver parts, and in that, in order for said terminal to judge whether a base station is present within its communication range, said power supply part provides electric power to said first receiver part, and said first receiver part detects said prescribed communication channel over which is transmitted a wireless signal, transmitted from said base station, for alerting to the presence of said base station, measures the received electric power in said communication channel, and determines whether the base station is present within the communication range of the terminal, on the basis of said received electric power.
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11. A base station detection method in a terminal for a wireless communication system comprising a base station and at least one terminal, characterized in that
said terminal has a first receiver part detecting a prescribed communication channel, a second receiver part performing signal processing of the received signal in said detected prescribed communication channel, and a power supply part providing electric power selectively to said first and second receiver parts, and in that, in order for said terminal to judge whether a base station is present within its communication range, said power supply part provides electric power to said first receiver part, and in that, in said first receiver part, there is detected said prescribed communication channel over which is transmitted a wireless signal, transmitted from said base station, for alerting to the presence of said base station, there is measured the received electric power in said communication channel, and there is determined whether the base station is present within the communication range of the terminal, on the basis of said received electric power.
Specification