Interterminal direct communication in digital mobile communication system
First Claim
1. A method for establishing synchronization between a plurality of terminals which are located within a service area of a base station in a digital mobile communication system having a predetermined number of channels, the method comprising the steps of:
- detecting an intermittent timing signal from a predetermined control channel of the base station; and
intermittently exchanging signaling information between the terminals through a channel based on a timing signal synchronizing with the intermittent timing signal.
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Accused Products
Abstract
In direct communications between PHS terminals, each terminal detects an intermittent timing signal from a predetermined control channel of the base station. Based on the intermittent timing signal, a terminal intermittently exchanges signaling information with another terminal through an idle channel to establish synchronization therebetween. A calling-party terminal searches for an idle channel and intermittently transmits a control signal to a called-party terminal through the idle channel with intermittently supplying power to a transmitter. A called-party terminal intermittently transmits a response signal to the calling-party terminal through the idle channel. When receiving the response signal from the called-party terminal, synchronization of the calling-party terminal with the called-party terminal is established.
116 Citations
10 Claims
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1. A method for establishing synchronization between a plurality of terminals which are located within a service area of a base station in a digital mobile communication system having a predetermined number of channels, the method comprising the steps of:
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detecting an intermittent timing signal from a predetermined control channel of the base station; and intermittently exchanging signaling information between the terminals through a channel based on a timing signal synchronizing with the intermittent timing signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A mobile terminal which is capable of communicating with a second mobile terminal without intervention of a base station, the mobile terminal and the second mobile terminal being located within a service area of the base station in a digital mobile communication system having a predetermined number of channels, the mobile terminal comprising:
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a receiver; a transmitter; a power supply; detecting means for detecting an intermittent timing signal from a predetermined control channel of the base station; generating means for generating a transmitting timing signal and a receiving timing signal in synchronization with the intermittent timing signal; first control means for controlling the receiver and the transmitter such that the receiver intermittently receives signaling information from the second mobile terminal in accordance with the receiving timing signal and the transmitter intermittently transmit signaling information to the second terminal in accordance with the transmitting timing signal; and second control means for controlling the power supply such that power is intermittently supplied to the transmitter in accordance with the transmitting timing signal and is intermittently supplied to the receiver in accordance with the receiving timing signal. - View Dependent Claims (8)
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9. A battery-saving method in a mobile terminal comprising a receiver, a transmitter and a battery, the mobile terminal being capable of communicating with a second mobile terminal without intervention of a base station, the mobile terminal and the second mobile terminal being located within a service area of the base station in a digital mobile communication system having a predetermined number of channels, the method comprising the steps of:
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detecting an intermittent timing signal from a predetermined control channel of the base station; generating a transmitting timing signal and a receiving timing signal in synchronization with the intermittent timing signal; controlling the receiver and the transmitter such that the receiver intermittently receives signaling information from the second mobile terminal in accordance with the receiving timing signal and the transmitter intermittently transmit signaling information to the second terminal in accordance with the transmitting timing signal; intermittently supplying power to the transmitter in accordance with the transmitting timing signal; and intermittently supplying power to the receiver in accordance with the receiving timing signal. - View Dependent Claims (10)
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Specification