Telecommunication system with radio line

Details Telecommunication system with radio line Telecommunication system with radio line

1982-09-07

1984-08-21

Pellinen, A. D.

H04M 1100

Patent

active

044671415

ABSTRACT:
A mobile subscriber station served by a telephone network is coupled by a radio link with an individually associated stationary relay station directly connected to that network. The tow stations are able to communicate with each other, over a radius of about 50 meters, on any of 40 channels available to all the posts of subscriber and relay stations in the neighborhood. Each station of a post includes a transmitter and a receiver operating at about 900 MHz; in the idle state of the post, the receivers of both stations continuously scan the available channels to determine their free or busy condition. A person wishing to make an outgoing call causes the transmitter of the subscriber station to send out a predetermined code word which is picked up by the receiver of the associated relay station in its scanning operation and, upon verification by a code comparator, initiates the emission of a handshake signal to the subscriber station whereupon the channel is seized to let the call proceed over the network. Similarly, the arrival of an incoming call at the relay station results in the transmission of the same or another predetermined code word to the subscriber station on a free channel which is seized for reception of the call after the code has been verified. With the code or codes used for outgoing and incoming calls uniquely assigned to a particular team, privacy is assured.

REFERENCES:
patent: 3458664 (1969-07-01), Adlhoch et al.
patent: 3476882 (1969-11-01), Vogelman et al.
patent: 3588371 (1971-06-01), Dal Monte
patent: 3806663 (1974-04-01), Peek et al.
patent: 4012597 (1977-03-01), Lynk, Jr. et al.
patent: 4332981 (1982-06-01), Palombi et al.

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