Establishing a telecommunications connection in a mobile communication system
First Claim
1. A method for establishing a telecommunications connection in a mobile communication system which has a base station, a plurality of mobile stations arranged for communicating with the base station at a respective uplink frequency and a respective downlink frequency of respective control and traffic channels of the base station, at least a first and a second mobile station arranged for communicating on a direct mode channel that comprises an uplink channel and a downlink channel, these first and second mobile stations arranged for communicating on the direct mode channel having respective memories, a repeater station arranged to relay traffic between the mobile stations arranged for communicating on the direct mode channel and the base station;
- comprising the steps of;
the repeater station listening to a downlink frequency of a control channel of the base station and the uplink channel of the direct mode channel;
a first said mobile station arranged for communicating on said direct mode channel sending a call set-up request to the repeater station on the uplink channel of the direct mode channel;
the repeater station transmitting the call set-up request to the base station;
in response to receiving the call set-up request, the base station commanding the repeater station to move to a specific traffic channel from any said traffic channels of the base station;
the repeater station using the downlink channel of the direct mode channel to command the mobile stations arranged for communicating on the direct mode channel, via a command, to switch-over to the uplink frequency of said specific traffic channel and start listening to said specific traffic channel;
the repeater station moving itself to the downlink frequency of said specific traffic channel and starting to listen to said specific traffic channel;
in response to receiving said command of the repeater station, said first and second mobile stations arranged for communicating on the direct mode channel storing information about said specific traffic channel in the respective memories thereof and moving to the uplink channel of the direct mode channel for sending a transmission to the repeater station and to the uplink frequency of said specific traffic channel for listening to transmissions forwarded by the repeater station;
the repeater station forwarding a transmission received from the base station to said first and second mobile stations at the uplink frequency of said specific traffic channel; and
the repeater station using the uplink frequency of said specific traffic channel to forward transmissions transmitted by said first and second mobile stations on the direct mode channel, to the base station and to said mobile stations which are listening to the uplink frequency of said specific traffic channel.
2 Assignments
0 Petitions
Accused Products
Abstract
A method, a mobile communication system and a mobile station for establishing a telecommunication connection on a direct mode channel and for improving radio coverage by way of using a simple and cheap repeater. An inexpensive and simple repeater is achieved by, instead of using two transceivers, using two receivers and just one transmitter. A mobile station, prepared for direct mode communication, is able to switch between channels answering to commands sent from the repeater.
38 Citations
16 Claims
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1. A method for establishing a telecommunications connection in a mobile communication system which has a base station, a plurality of mobile stations arranged for communicating with the base station at a respective uplink frequency and a respective downlink frequency of respective control and traffic channels of the base station, at least a first and a second mobile station arranged for communicating on a direct mode channel that comprises an uplink channel and a downlink channel, these first and second mobile stations arranged for communicating on the direct mode channel having respective memories, a repeater station arranged to relay traffic between the mobile stations arranged for communicating on the direct mode channel and the base station;
- comprising the steps of;
the repeater station listening to a downlink frequency of a control channel of the base station and the uplink channel of the direct mode channel; a first said mobile station arranged for communicating on said direct mode channel sending a call set-up request to the repeater station on the uplink channel of the direct mode channel; the repeater station transmitting the call set-up request to the base station; in response to receiving the call set-up request, the base station commanding the repeater station to move to a specific traffic channel from any said traffic channels of the base station; the repeater station using the downlink channel of the direct mode channel to command the mobile stations arranged for communicating on the direct mode channel, via a command, to switch-over to the uplink frequency of said specific traffic channel and start listening to said specific traffic channel; the repeater station moving itself to the downlink frequency of said specific traffic channel and starting to listen to said specific traffic channel; in response to receiving said command of the repeater station, said first and second mobile stations arranged for communicating on the direct mode channel storing information about said specific traffic channel in the respective memories thereof and moving to the uplink channel of the direct mode channel for sending a transmission to the repeater station and to the uplink frequency of said specific traffic channel for listening to transmissions forwarded by the repeater station; the repeater station forwarding a transmission received from the base station to said first and second mobile stations at the uplink frequency of said specific traffic channel; and the repeater station using the uplink frequency of said specific traffic channel to forward transmissions transmitted by said first and second mobile stations on the direct mode channel, to the base station and to said mobile stations which are listening to the uplink frequency of said specific traffic channel. - View Dependent Claims (2, 3, 4, 5)
- comprising the steps of;
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6. A method for establishing a telecommunications connection in a mobile communication system which has a base station, a plurality of mobile stations arranged for communicating with the base station at a respective uplink frequency and a respective downlink frequency of respective control and traffic channels of the base station, at least a first and a second mobile station arranged for communicating on a direct mode channel that comprises an uplink channel and a downlink channel, a repeater station arranged to relay traffic between the mobile stations arranged for communicating on the direct mode channel and the base station, comprising the steps of:
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the repeater station listening to a downlink frequency of a control channel of the base station and the uplink channel of the direct mode channel; the base station sending a call set-up request, for setting up a call to be established, to the repeater station, requesting at least said first mobile station to participate in the call to be established and notifying the repeater station of a specific traffic channel allocated for the call from among said traffic channels of the base station; the repeater station using the downlink channel of the direct mode channel to command said mobile stations arranged for communicating on the direct mode channel, via a command, to switch over to the uplink frequency of said specific traffic channel and to start listening to said specific traffic channel; said repeater station moving itself to the downlink frequency of said specific traffic channel, starting to listen to said specific traffic channel; in response to receiving said command of the repeater station, said first and second mobile stations arranged for communicating on the direct mode channel storing information about said specific traffic channel in the respective memories thereof and moving to the uplink channel of the direct mode channel for sending a transmission to the repeater station and to the uplink frequency of said specific traffic channel for listening to transmissions forwarded by the repeater station; the repeater station forwarding a transmission received from the base station to said first and second mobile stations at the uplink frequency of said specific traffic channel; the repeater station using the uplink frequency of said specific traffic channel to forward transmissions transmitted by said first and second mobile stations on the direct mode channel, to the base station and to said mobile stations which are listening to the uplink frequency of said specific traffic channel. - View Dependent Claims (7, 8, 9, 10)
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11. A mobile communication system comprising:
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a base station having control and traffic channels each comprising an uplink frequency and a downlink frequency; at least a first and a second mobile station arranged for communicating on a direct mode channel that comprises an uplink channel and a downlink channel; and a repeater station arranged for transmitting traffic between the mobile stations communicating on the direct mode channel and the base station; the repeater station comprising; a first receiver unit arranged for receiving radio messages from the base station; a second receiver unit arranged for receiving radio messages from mobile stations communicating on the uplink frequency of the direct mode channel; a control unit arranged for controlling the operation of said first and second receiver units and the repeater station, and only a single transmitter unit, arranged for transmitting radio messages in response to commands of said control unit, to the base station and a mobile station listening to an uplink frequency of a traffic channel of the base station, or to a mobile station from among said mobile stations arranged communicating on the direct mode channel. - View Dependent Claims (12, 13, 14)
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15. A mobile station adapted to communicate with another mobile station and with a repeater station on a direct mode channel having an uplink channel and a downlink channel, the repeater station further arranged to communicate with a base station on a traffic channel having an uplink frequency and a downlink frequency, said mobile station comprising:
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a memory; a transceiver, capable of communicating on the direct mode channel; a controller for controlling the operation of said mobile station; switching means, which are arranged to be responsive to a command sent by the repeater station, for moving said transceiver of said mobile station to listen to a repeater station transmission on an uplink frequency of a traffic channel specified in said command sent by said repeater station, the repeater station transmission on said uplink frequency of said traffic channel including a relay of a signal received by said repeater station from said base station on said downlink frequency of said traffic channel. - View Dependent Claims (16)
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Specification