Telecommunications – Carrier wave repeater or relay system – Portable or mobile repeater
Patent
1995-11-02
1999-05-25
Faile, Andrew I.
Telecommunications
Carrier wave repeater or relay system
Portable or mobile repeater
455509, 455515, H04B 715
Patent
active
059077948
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for controlling a subscriber station operating on a direct mode channel in a radio system, this radio system comprising a radio network with at least one base station and subscriber stations, and further, at least one repeater station, which forwards traffic between the at least one base station and the subscriber stations operating on the direct mode channel.
BACKGROUND OF THE INVENTION
The invention relates to the field of mobile phone systems. A subscriber in a mobile phone system, i.e. a subscriber station, for instance a mobile phone or some other means of communication, may be registered in a radio network or system, whereby it is registered in the radio network via system and traffic channels maintained by the base stations of the radio network.
In addition to the system channels in mobile phone systems, so-called direct mode channels can also be used in connection with a radio system, i.e. direct mode operation is applied. Subscriber stations using direct mode operation do not communicate directly with the radio network or its base stations. Direct mode channels are frequencies at which mobile phones or other means of communication are able to communicate directly with each other without the system.
Direct mode channels are typically used in situations where for instance, a group of portable mobile phones are communicating with each other at such a long distance from the base station that system channels cannot be used.
Another important way of using direct mode channels is to increase the capacity when the traffic in the system increases fast in some part of the service area of the system, for instance in some point-like part of the radio network.
A direct mode channel is referred to with the terms direct or simplex channel, or a simplex connection. A direct mode channel is a channel which is typically not at all used by the system. It may be for instance, a channel of the breadth of the channels of the system, for instance 12.5 kHz or 25 kHz. Among the mobile phones operating on a direct mode channel, the transmitting station has tuned its transmitter to the channel and transmits speech or data information. The other mobile phones set to direct mode operation have tuned their receivers to the same channel, whereby they are able to directly hear the transmission.
Operation on a direct mode channel may take place on the analog or digital modulation principle. A mobile phone transmitting on the channel may also transmit signalling information, such as information on rights of use and priorities or on the group operating on the channel. On the direct mode channel, an encryption may be carried out or plain speech can be transmitted.
Subscriber stations using direct mode operation communicate with other subscriber stations on a direct mode channel without necessarily being in direct contact with the base stations of the radio network.
One form of a direct mode channel is a direct mode channel equipped with a repeater, which direct mode channel comprises a separate repeater station in addition to the subscriber stations, this repeater station forwarding traffic between the subscriber stations using the direct mode channel. In this case, the traffic on the direct mode channel takes place on the semiduplex principle. The subscriber stations using direct mode operation can thus also communicate with the radio network via repeater stations. A repeater station is a piece of equipment comprising two radio apparatuses connected to each other. The repeater station transmits the information messages transmitted on the direct mode channel to desired network elements, for instance to the base stations of the radio network, these base stations transmitting the information messages further to the switching centres of the radio network and further to the databases located in the radio network.
In solutions according to prior art, a problem is presented, for instance by the fact that when a subscriber station, for instance a mobile phone or some othe
REFERENCES:
patent: 3745462 (1973-07-01), Trimble
patent: 3984807 (1976-10-01), Haemming
patent: 4217588 (1980-08-01), Freeny, Jr.
patent: 4539706 (1985-09-01), Mears et al.
patent: 4682367 (1987-07-01), Childress et al.
patent: 4833701 (1989-05-01), Comroe et al.
patent: 5003619 (1991-03-01), Morris et al.
patent: 5023930 (1991-06-01), Leslie
patent: 5109526 (1992-04-01), Reed
patent: 5133080 (1992-07-01), Borras
patent: 5175866 (1992-12-01), Childress et al.
patent: 5408679 (1995-04-01), Masuda
patent: 5459761 (1995-10-01), Monica et al.
patent: 5526376 (1996-06-01), Kellenberger et al.
patent: 5666661 (1997-09-01), Grube et al.
patent: 5771463 (1998-06-01), Lehmusto et al.
patent: 5781860 (1998-07-01), Lopponen et al.
patent: 5790938 (1998-08-01), Talarmo
patent: 5802457 (1998-09-01), Heiskari et al.
Dodrill et al., "Using Radio Links and Relays", Communication Engineering, 1953 IRE national meeting of the Professional Group on Vehicular Communication, pp. 15-17, Jan. 1954.
Heiskari Mika
Lehmusto Mika
Faile Andrew I.
Moe Aung S.
Nokia Telecommunications Oy
LandOfFree
Controlling a subscriber station on a direct mode channel does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controlling a subscriber station on a direct mode channel, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controlling a subscriber station on a direct mode channel will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-408662