Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Patent
1995-12-27
1998-11-24
Eisenzopf, Reinhard J.
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
455517, 455416, H04Q 722
Patent
active
058421360
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT FI95/00071, filed Feb. 15, 1995.
FIELD OF THE INVENTION
The present invention relates to a method for controlling a call in a telecommunication system, which comprises a telecommunication network and a first subscriber station and one or more other subscriber stations, this method comprising the step of maintaining a call in which the subscriber stations participate.
BACKGROUND OF THE INVENTION
It is typical of telecommunication networks that calls which involve at least two parties are established. It may thus occur that one party of the call would like to change the group of the subscribers who participate in the call or telecommunication connection concerned.
The subscriber station which has the most need to change the group of the subscriber stations participating in the call is often a dispatcher controlling the telecommunication connection or call, or a fixed control point. This type of situation is typical of the PMR networks (PMR=Private Mobile Radio), in which the dispatcher communicates with the work groups by using different calls, group calls, conference calls and individual calls.
In calls of this type, the dispatcher often has a need to change the number and group of the subscribers participating in a call. Group calls are thus particularly concerned, the dispatcher desiring to change the group of the subscriber stations participating therein even to a considerable degree. A group call is a call in which the system, for instance its dispatcher, or some subscriber station, instructs several, at least three, subscriber stations to join the same call by a single command. The groups are formed from the members of a company or some other user organization, and the groups are often programmed into a radio telephone, the exchange not necessarily knowing which mobile stations belong to which group. Typically, one telephone can belong to several groups.
Among the above-mentioned types of calls, only the conference call is one to which a caller, i.e. for instance a person who has started the call or a dispatcher supervising the call, can add new subscribers without setting up a new call. In connection with any type of call, it is not possible to reduce the number of the participants in a call without releasing the call entirely or partly. Thus, if some subscriber station, for instance the dispatcher, desires to reduce the number of the subscriber stations participating in a call, typically a group call, the only possibility for the dispatcher is to release the entire call. The release of a call causes the problem that the resources used, for instance radio channels and switching apparatuses, are lost at least for a moment, during which time these resources may end up in some other use in another call if the traffic is heavy. Thus, the caller, for instance the dispatcher, is not able to enter smoothly into communication with the desired smaller group.
To avoid this disappointment, the caller has to maintain the call with the larger group for an unnecessarily long time in the prior art solutions, thus wasting the resources. On the other hand, a particular subscriber station, for instance the dispatcher, may desire to inform a smaller group quickly of something that the dispatcher does not want the larger group to know about. The implementation of this, too, is made more difficult if that particular subscriber station has to release the call first and set up a new call, for which resources cannot necessarily be found.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a solution for the problems associated with the prior art solutions. More accurately, the object of the invention is to provide a method and a system by means of which a subscriber station, for instance a dispatcher, participating in a telecommunication connection can, if it so desires, change, or more particularly, reduce, the group of the subscriber stations participating in the call.
This new type of method for controlling a call in a telecom
REFERENCES:
patent: 4649567 (1987-03-01), Childress
patent: 5224094 (1993-06-01), Maher
patent: 5369783 (1994-11-01), Childress et al.
patent: 5373549 (1994-12-01), Bales et al.
patent: 5473605 (1995-12-01), Grube et al.
MPT 1327, "A Signalling Standard for Trunked Private Land Mobile Radio Systems", Jan. 1988, p. 11-5.
Eisenzopf Reinhard J.
Kincaid Lester G.
Nokia Telecommunications Oy
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