Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1996-02-27
1998-04-28
Eisenzopf, Reinhard J.
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
455517, H04Q 720, H04B 700
Patent
active
057458537
DESCRIPTION:
BRIEF SUMMARY
This application claims benefit of international application PCT/FI95/00368, filed Jun. 26, 1995.
FIELD OF THE INVENTION
The invention relates to a method for allocating radio channels in a quasi-transmission trunked mobile communication system comprising base stations and a first mobile station communicating with the base stations by means of radio channels, and at least one other mobile station requiring a radio channel. In the method, a radio channel is kept reserved for such a call in which the first mobile station is participating, the radio channel is allocated for the first mobile station for the duration of its call transaction, the first mobile station terminates its call transaction, and the radio channel is kept reserved for a predetermined time for the call.
BACKGROUND OF THE INVENTION
A call refers to complete exchange of information between two or more parties. A call, in turn, may consist of one or more call transactions (speech items). In a semi-duplex call these transactions are sequential. A call transaction refers generally to all functions associated with complete unidirectional transmission of information during a call.
In a trunked radio system, several user groups, even several user organizations share a common pool of channels. In a transmission trunking procedure, a group of simultaneous calls shares a certain group of traffic channels so that for each call, a traffic channel is allocated separately for each call transaction, i.e. each activation of the push-to-talk switch from this group. The traffic channel is de-allocated immediately at the end of the call transaction, i.e. when the push-to-talk switch is released and one stops speaking. Between the call transactions, the mobile radio station participating in the call shifts to a listening state onto a control channel. It is typical of transmission trunking that a channel may be allocated with only a little signalling if a call is going on.
On account of transmission trunking, for instance, more than four calls may, in principle, be allowed simultaneously in a 4-channel system.
In trunked radio systems of this kind, a message trunking procedure is usually employed in which a traffic channel is allocated permanently for one call for the entire duration of the call, whereby the call may contain several separate call transactions, i.e. several activations of the push-to-talk switch at various terminal devices. The channel is de-allocated or released only when the call is explicitly terminated or possible time supervision expires. When the message trunking principle is utilized, the number of simultaneous calls is limited to the number of traffic channels.
The invention relates to a trunked radio system of the type in which on at least some of the traffic channels, a so-called transmission trunking procedure is utilized, in which the number of simultaneous calls may exceed the number of available traffic channels so that for a call, a traffic channel is allocated separately for each call transaction, i.e. each activation of the push-to-talk switch. The traffic channel is immediately de-allocated at the end of the call transaction, i.e. when one releases the push-to-talk switch and stops speaking. Between the call transactions, the mobile station MS participating in the call goes to a control channel. Operations similar to transmission trunking are disclosed e.g. in Finnish patent application 925,430, which is corresponding to international application PCT/FI93/00500. A version of transmission trunking is so-called quasi-transmission trunking, which is otherwise similar to conventional transmission trunking, but channel de-allocation is delayed for a short period at the end of the call transaction, i.e. after releasing the push-to-talk switch. During this "delay-time" the channel allocation may be re-used for a new call transaction that is a part of the same call. Quasi-transmission trunking is disclosed, e.g. in the description of U.S. Pat. No. 4,646,345.
In prior art methods, the procedure is the following. When the user pres
REFERENCES:
patent: 4646345 (1987-02-01), Zdunek et al.
patent: 5159702 (1992-10-01), Aratake
Patent Abstract of Japan, vol. 7, No. 226, E-202, Abstract of JP, A, 58-11744 (Nippon Denki K.K.), 13 Jul. 1983.
Bhattacharya Sam
Eisenzopf Reinhard J.
Nokia Telecommunication Oy
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