Multiplex communications – Duplex – Communication over free space
Patent
1994-07-19
1997-09-09
Bost, Dwayne
Multiplex communications
Duplex
Communication over free space
455466, 455403, H04Q 720
Patent
active
056663986
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a radiotelephony system according to the introductory part of claim 1.
STATE OF THE ART
Multi-user systems for the radio-supported connection of telephone subscribers to the public telephone network are widely used. The following categories are principally involved:
These are primarily characterized by roaming and handover (overload) functions with all the consequences resulting therefrom for network control, and the need to be able to use mobile equipment at high speeds of up to 200 km/h and the resultant requirements to be met by the radio transmission process.
Like the mobile radio networks, these have the roaming and handover properties, but with regard to subscriber range, territorial area, functionality and especially access to the public systems they are subject to the above-named limitations.
In this case, systems are primarily offered which are to disconnect the cordless telephone from a particular main connection and extend the territorial range of use to the area of a PABX by inserting a handover.
These are characterized by the wireless connection of stationary subscribers in a subscriber-equal connection of the radio transmission. That is to say, in the telephone exchange a subscriber connection is present for each subscriber, and the radio transmission apparatus is inserted between these subscriber connections and the radio subscribers.
These are characterized by the fact that from a main central office or repeating center they produce a point-to-multipoint connection in territorially widely separated areas, and radio links are used. Channel groups are transmitted, which can be split up in the transmission path into several planes and are transferred to a number of endpoints. From these endpoints the subscribers are connected usually by cable routes, and if radio is used a channel-equal connection is usually made. No switching functions are created in rural networks.
Radiotelephone systems are widely used, and are usually designed as mobile telephone systems. For this reason they are constructed as cellular systems and overlappingly serve a larger area in which they enable subscribers to have mobile connection to telephone traffic. For this purpose these systems must perform overload and roaming functions, i.e., the subscriber using a mobile telephone has to be "forwarded" when changing from one cell to an adjacent cell, and the system must remember the current location of a mobile subscriber to be able to send a call to that subscriber.
These systems therefore operate generally with an overlay network which connects the individual radio cells to one another and through which the entire control of the system as well as the telephone connections of the subscribers are connected. Only at a few select points does this overlay network have transitions into the public telephone network. Connections from one network into the other can be produced by special dialing.
On account of these apparatus, mobile telephone systems are substantially more expensive than stationary telephone service, which has an effect both on the flat rates and on the call charges.
Another difference from the standard telephone is that special terminal equipment is used, which in the first place is expensive, since the radio components have to be capable of mobile use, and in the second place it is different in operation from standard telephones.
The mobile telephone system is therefore employed mainly in the expansion of an existing and fully developed stationary telephone system.
The use of radiotelephone systems among subscribers is not very common, because in general the connection of the subscriber's terminal device through a subscriber connection line to the nearest telephone exchange is a cost-attractive solution for telephone systems which historically have continually been expanding.
Changes which may lead to a reversal of this judgment can be the following: wiring is becoming a capacity bottleneck (material and operating capacity) and an excessive financial burden. the cos
REFERENCES:
patent: 4675863 (1987-06-01), Paneth et al.
G. Mandel et al, Nochrichtentech, Elektron., Berlin, vol. 42 pp. 130-135 (1992).
P. Leopold, ntz., vol. 45 pp. 286-287 (1992).
Horst Mayr.-Stein et al, Nachrichten, vol. 87 pp. 35-43 (1991).
C. Buckingham et al., IEEE Comm. Mag., pp. 105-110 (1991).
Hachenberger Andreas
Herold Detlef
Jackel Klaus
Schiffel Reinhard
Stadler Bruno
Bost Dwayne
Jenoptik Communications GmbH
Trost William G.
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