Mobile telecommunications system having an expanded operational zone
First Claim
1. A non-cellular mobile telecommunication system for connecting a public communication network to mobile terminals via radio communication channels, comprising:
- a base station connected to said public communication network for receiving information signals therefrom and having a non-directional antenna for broadcasting said information signals at a first frequency over a first operational zone, said first operational zone being characterized by an electric field strength of said broadcast from said base station that exceeds a predetermined level, said base station further receiving radio transmissions at a second, different frequency by said non-directional antenna and transferring information signals contained therein to said public telecommunication network;
a relay station provided outside said first operational zone and having a directional antenna directed to said non-directional antenna of said base station for receiving said broadcast therefrom, said relay station further having a non-directional antenna for broadcasting said information signals contained in said broadcast from said base station, at a third frequency which is different from any of said first and second frequencies over a second operational zone, said second operational zone being characterized by an electric field strength of said broadcast from said relay station that exceeds a predetermined level, said relay station further receiving radio transmissions at a fourth frequency different from any of said first through third frequencies by said non-directional antenna provided thereto and transmitting information signals contained thereto from said directional antenna of said relay station to said non-directional antenna of said base station; and
a mobile terminal movable between said first and second operational zones and operating in either of said first and second operational zones, said mobile terminal receiving said broadcast from either said base station at said first frequency or said relay station at said third frequency and transmitting information signals to either the base station at the second frequency or the relay station at the fourth frequency, said mobile terminal monitoring the strength of said electric field of said broadcast from said base station and said relay station for selecting a reception at said first frequency and a transmission at said second frequency when said monitored strength of the electric field of the broadcast from the base station exceeds a predetermined threshold, said mobile terminal further selecting a reception at said third frequency and a transmission at said fourth frequency when said strength of the electric field of the broadcast from the base station does not exceed said predetermined threshold wherein said mobile terminal selects reception frequencies independently without control from said base, said relay or other stations.
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Accused Products
Abstract
A mobile telecommunication system comprises a base station connected to a public communication network and having a non-directional antenna for broadcasting at a first frequency over a first operational zone and for receiving a radio transmission at a second frequency, a relay station provided outside the first operational zone and having a directional antenna directed to the non-directional antenna of the base station for receiving the broadcast therefrom and for transmitting thereto at the second frequency, the relay station further having a non-directional antenna for broadcasting at a third frequency over a second operational zone and for receiving a radio transmission at a fourth frequency, and a mobile terminal movable between the first and second operational zones. The mobile terminal receives the broadcast from either of the base station and the relay station at either of the first and third frequencies and transmit at either of the second and fourth frequencies, wherein the mobile terminal monitors the strength of electric field of the broadcast from the base station and the relay station and selects the station to which the mobile terminal communicates in response to the strength of the electric field.
144 Citations
7 Claims
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1. A non-cellular mobile telecommunication system for connecting a public communication network to mobile terminals via radio communication channels, comprising:
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a base station connected to said public communication network for receiving information signals therefrom and having a non-directional antenna for broadcasting said information signals at a first frequency over a first operational zone, said first operational zone being characterized by an electric field strength of said broadcast from said base station that exceeds a predetermined level, said base station further receiving radio transmissions at a second, different frequency by said non-directional antenna and transferring information signals contained therein to said public telecommunication network; a relay station provided outside said first operational zone and having a directional antenna directed to said non-directional antenna of said base station for receiving said broadcast therefrom, said relay station further having a non-directional antenna for broadcasting said information signals contained in said broadcast from said base station, at a third frequency which is different from any of said first and second frequencies over a second operational zone, said second operational zone being characterized by an electric field strength of said broadcast from said relay station that exceeds a predetermined level, said relay station further receiving radio transmissions at a fourth frequency different from any of said first through third frequencies by said non-directional antenna provided thereto and transmitting information signals contained thereto from said directional antenna of said relay station to said non-directional antenna of said base station; and a mobile terminal movable between said first and second operational zones and operating in either of said first and second operational zones, said mobile terminal receiving said broadcast from either said base station at said first frequency or said relay station at said third frequency and transmitting information signals to either the base station at the second frequency or the relay station at the fourth frequency, said mobile terminal monitoring the strength of said electric field of said broadcast from said base station and said relay station for selecting a reception at said first frequency and a transmission at said second frequency when said monitored strength of the electric field of the broadcast from the base station exceeds a predetermined threshold, said mobile terminal further selecting a reception at said third frequency and a transmission at said fourth frequency when said strength of the electric field of the broadcast from the base station does not exceed said predetermined threshold wherein said mobile terminal selects reception frequencies independently without control from said base, said relay or other stations. - View Dependent Claims (2, 5, 6, 7)
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- 3. A mobile telecommunication system as claimed in claimed 1, in which said relay station comprises a first receiver for receiving said broadcast from said base station at the first frequency for producing a baseband signal in response thereto, a first transmitter supplied with said baseband signal from said first receiver for producing a radio frequency signal with said third frequency, a second receiver for receiving said transmission at said fourth frequency for producing a baseband signal, and a second transmitter supplied with said baseband signal from said second receiver for transmitting said baseband signal as a radio frequency signal with said second frequency.
Specification