Synchronizing a telecommunications connection in a mobile commun

Details Synchronizing a telecommunications connection in a mobile commun Synchronizing a telecommunications connection in a mobile commun

1997-04-14

1999-11-02

Nguyen, Chau

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370465, 455426, 455434, H04B 7212

Patent

active

059783672

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a method for synchronizing a telecommunications connection in a mobile communications system comprising at least one base station communicating on system channels of the mobile communications system, the channels consisting of control channels and traffic channels; a first and at least a second mobile station communicating on a direct mode channel divided into frames consisting of time-slots.


BACKGROUND OF THE INVENTION

The invention relates to the field of mobile telephone systems. A subscriber of a mobile telephone system, that is, a subscriber station, e.g. a mobile telephone or a mobile station may be connected to a mobile network or system, whereby it is connected to the mobile network via system channels maintained by the base stations of the mobile network, the system channels consisting of control channels and traffic channels.
In addition to the system channels located in mobile telephone systems, so-called direct mode channels may be used in association with the mobile system, i.e. communication takes place in a direct mode. Subscriber stations communicating in the direct mode do not communicate directly with the mobile network or the base stations related to it. Direct mode channels are frequencies on which mobile telephones or other means of communication can communicate without the system directly with each other, or via repeater stations, either with the base stations of the system or with other mobile stations.
Direct mode channels are typically used in situations in which e.g., a group of hand-held mobile phones which communicate with each other are so remote from the base stations that the use of system channels is not possible.
Another important use of direct mode channels is increasing the capacity when the traffic in the system rapidly increases, e.g. due to an incident occuring in some part of the service area of the system, e.g. in some spot-like part.
A direct mode channel is a channel that is typically not used by the system. It may be e.g., a channel whose channel spacing is the same as that in the mobile communications system, e.g. 12.5 kHz or 25 kHz. On direct mode channels, a mode of simplex operation is used. From the group of the mobile stations operating on the direct mode channel, the transmitting party has tuned his or her transmitter onto the channel and is transmitting speech or data information. The other mobile stations that have been activated onto the direct mode channel have tuned their receivers onto the same frequency so that they will directly hear the transmission.
On a direct mode channel, communication may take place by means of analog modulation or digital modulation. A mobile station transmitting on the channel may also use signalling information, such as information on access rights and priorities, or the group communicating on the channel, or data communication. On a direct mode channel, encryption may be carried out, or plain speech can be transmitted.
Subscriber stations operating in the direct mode communicate with other subscriber stations on a direct mode channel without having a direct connection to the base stations of the mobile network. Subscriber stations operating in the direct mode, however, may communicate with the mobile network via repeater stations. A repeater station is a unit in which there are two transceivers connected to each other. A repeater station typically comprises two transceivers. The repeater station forwards information messages transmitted on the direct mode channel to the desired network elements, such as the base stations of the radio network, which will forward the information messages to the exchanges of the radio network. Information messages forwarded by the repeater station may be e.g., speech, or data or signalling messages. When the repeater station is being used, e.g. a semiduplex mode of operation may be used on the direct mode channel.
A problem related to a prior art solution is how to make the mobile station operate upon request in accordance with the dual watc

REFERENCES:
patent: 5617412 (1997-04-01), Delprat et al.
patent: 5636243 (1997-06-01), Tanaka
patent: 5771463 (1998-06-01), Lehmusto et al.
patent: 5781860 (1998-07-01), Lopponen et al.
patent: 5790938 (1998-08-01), Talarmo

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