Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Patent
1997-12-22
2000-10-24
Le, Thanh Cong
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
455514, 455527, H04B 700
Patent
active
061380318
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a method for call establishment in a mobile communication system comprising mobile stations that contain a database in which are marked first calls of a first priority level, and a network infrastructure which said mobile stations communicate with.
The invention relates to all telecommunication systems that have communications competing with one another. The invention is particularly necessary in systems where there are subscribers who can take part in simultaneous communications competing with one another. The invention particularly relates to mobile communication systems, such as PMR mobile communication systems (PMR Private Mobile Radio), that are used by organizations and the authorities. In these kind of networks, need often arises for establishing normal or group calls which have a priority with regard to one another, and which can be participated by several subscribers at the same time.
BACKGROUND OF THE INVENTION
On the basis of the above, it can be noted that telecommunication systems may have situations in which there are several parallel or competing communications to one subscriber. These communications can be, for example, group calls. The situation may be such that the subscriber is connected to a so-called basic communication group, which is organization-specific and by means of which information on the daily routines is conveyed within the network. During special incidents, such as emergencies, it may be necessary to create inter-organization communication groups to which some of the subscribers of the different organizations must immediately be connected. In such a case, it is necessary to create communication groups into which subscribers can be forced in order to make them participate even if they were currently taking part in some other communication, for example a previous group call. It may also be necessary to make subscribers stay in a communication created for a special incident even if another communication, such as a new call or group call, were to begin in the middle of the communication in question.
Need to direct subscribers into a priority communication arises especially in case a large part of the communication within the system is group communication, as is the case in the PMR systems mentioned above, and the subscriber may participate in several group communications, or if the subscriber receives several individual communications, or if individual communications are competing with one or several group communications. In such a system there might be need to provide one or more of the communications with a special status so that primarily traffic of the communications that have the special status is forwarded by the subscriber station to the user. Giving the special status is carried out by providing the calls with different priority levels.
In a prior art solution, disclosed in the U.S. Pat. No. 5,257,416, each communication is allocated a dedicated channel which a mobile station checks in order to find out whether there is communication traffic for the station on that channel. This means that the subscriber station scans different radio channels and if there is traffic on several channels the station checks that it is on the correct channel in accordance with the priority hierarchy.
Giving priority to the communications received by a subscriber or subscribers represents the prior art solution to the problem. The prior art solution, however, is not applicable to a situation in which priority tables stored for example in the subscriber stations of the subscriber are continuously changed. The previous solution causes problems because all the communication identifications are within the same area, which means that when adding identifications it is difficult to keep the priority tables in the desired order. As new numbers are added, two kinds of priority table assignments can be employed:
In an absolute priority table assignment, an absolute position is given, for example the 1st, 3rd or 5th. A problem with this is tha
REFERENCES:
patent: 4716407 (1987-12-01), Borras et al.
patent: 5257416 (1993-10-01), Cannon
patent: 5638055 (1997-06-01), McDonald et al.
patent: 5742904 (1998-04-01), Pinder et al.
Paavonen Tapio
Sillanpaa Anna
Toyryla Hannu
Cong Le Thanh
Nokia Telecommunications Oy
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