Telecommunications – Radiotelephone system – Usage measurement
Patent
1997-04-16
2000-08-22
Bost, Dwayne D.
Telecommunications
Radiotelephone system
Usage measurement
455569, H04M 1500, H04B 138
Patent
active
061085316
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a terminal equipment in a cellular radio system, said equipment comprising a cellular radio transceiver.
As cellular radio systems become common and as their coverage areas grow, these systems replacing systems implemented with fixed wire telephone connections in many places, it has become necessary to develop pay telephones utilizing cellular telephone systems. A need for such telephones exists for instance in areas where no fixed wire telephone connections have been constructed, or in applications where a pay telephone is located in an environment where a connection to a fixed network is not easily available, for instance in moving vehicles.
The known pay telephone solutions wherein a telephone uses the radio path in establishing a connection are implemented with the arrangement according to FIG. 1. The known arrangements comprise a terminal equipment 10, which is an apparatus resembling a conventional telephone set, comprising a dialling means 10a for dialling a telephone number and a receiver 10b. The terminal equipment 10 may be for instance a dual tone dial or pulse dial telephone set, telefax, modem, or a similar apparatus. The terminal equipment 10 is connected to a teleadapter 11 by means of a conventional two-wire connection 13. A cellular radio transceiver 12 is connected to the teleadapter by means of a data link connection 14, such as a bus interface or the like. The transceiver 12 may be for instance a conventional cellular telephone without a user connection. The purpose of the teleadapter 11 is to adapt the user connection and electric connection of the radio transceiver to correspond to the characteristics of the two-wire subscriber connection of a fixed wire telephone network, i.e. to adapt the operation of the terminal equipment 10 providing a user connection of a conventional pay telephone to the operation of the radio transceiver 12 of a cellular radio system. Structurally, the teleadapter may be integrated to be in association with the radio transceiver, but corresponding connections (two-wire connection and bus interface) can however be observed.
As regards the operator, an essential characteristic of a pay telephone is the transmitting of monitoring and control data from the pay telephone to the operator. This data, which will below be referred to as call data, comprises for instance traffic reports, failure reports, notices of need for maintenance, the amount of coins in coin phones, the data of cards used in card phones etc. The call data is bidirectional data transmission, where the pay telephone transmits data on its operation to the operator station and the operator station sets the functional parameters of the pay telephone.
In conventional wire telephone network pay telephones, the call data is transmitted to the operator by using a separate telephone line. Said apparatuses thus comprise two telephone connections: one for a speech connection and the other for transmitting telephone data. In pay telephones used in known cellular radio systems, data transmission is performed in such a manner that a telephone is provided with two separate radio transceivers, one of which is reserved for telephone data transmission. Another known way is to provide a telephone with an automatism performing a maintenance call to the operator center always when required. A third known manner is to provide the operator center with a program which regularly performs a maintenance call to all the pay telephones it controls.
In the known solutions to implement a pay telephone in cellular radio systems, attempts have been made to imitate as closely as possible the operation of a conventional pay telephone, which has resulted in an implementation where a two-wire connection has been established in practice by means of a teleadapter, to which two-wire connection it has been possible to connect an apparatus resembling a conventional pay telephone. The use of a teleadapter causes additional costs, however, and it complicates the implementation of the telephone structure.
The
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Berg Jukka
Savolainen Kimmo
Bost Dwayne D.
Legree Tracy M.
NE-Products Oy
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