Call set-up for fixed wireless communications system

Details Call set-up for fixed wireless communications system Call set-up for fixed wireless communications system

1998-04-15

2001-03-20

Hunter, Daniel S. (Department: 2749)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S554100, C455S552100, C455S445000, C455S560000

Reexamination Certificate

active

06205329

ABSTRACT:

FIELD OF THE INVENTION
Generally, the present invention relates to communication systems and more particularly to a communication system including a radio communication system and a wire line communication system acting as a fixed wireless communication system.
BACKGROUND OF THE INVENTION
Generally, a fixed wireless telephone service is used as an alternative to wire line telephone service in rural or urban settings, particularly in developing countries. One way of providing a fixed wireless telephone service is to use a conventional cellular telephone system and couple it with a wire line telephone system to provide wireless service to fixed terminals throughout a geographic area.
There are obvious differences between a conventional cellular telephone system and a conventional wire line telephone system. For example, in a wire line telephone system, upon detection of the off hook condition in the communication device an audio line is directly coupled between a wire line telephone switch and the user's communication device. This audio line provides instant dialing services for the user and provides dial tone feedback to the user indicating service is available. In a conventional cellular system, a phone number is dialled and then an indicator or send button is depressed to transmit a message indicating to a central base station that a call or communication is desired. After a certain amount of delay a communication channel is allocated to the user and is routed directly to the dialed number. No direct dialing on the communication channel is allowed and the system does not provide dial tone feed back.
In order to provide a fixed wireless telephone service, it is desirable to emulate the service of a fixed wire line telephone service. Specifically, it would be advantageous to provide dial tone feedback and immediate connection to a telephone switch upon transmitting an off hook signal from a communication unit in a fixed wireless telephone system.
SUMMARY OF THE INVENTION
A first aspect of the present invention provides a method of call setup for use in a communication system including a radio communication system and a wireline communication system, the method comprising the steps of detecting an off-hook condition at a first communication device; transmitting, responsive to said step of detecting, a predetermined digital bit stream using the radio communication system; recognizing the predetermined digital bit stream as a request for communication services; requesting, responsive to said step of recognizing, an audio link on the wireline communication system; and linking the audio link on the wireline communication system with the first communication device over the radio communication system, thereby forming a communication link between the first communication device and the wireline communication system allowing a user to dial a desired communication number.
A second aspect of the present invention provides a call setup apparatus for use in communication system including a radio communication sytem and a wireline communication system, the call setup apparatus comprising: a detector for detecting an off-hook signal at a first communication device; a radio transmitter, responsive to said detector, for transmitting a predetermined digital bit stream over the radio communication system; a radio receiver for receiving the predetermined digital bit stream; a controller comprising: means for recognizing the predetermined digital bit stream as a request for service; means, responsive to the means for recognizing, for requesting an audiolink on the wireline communication system, and linking the audiolink with the first communication device thereby allowing a user to dial a desired communication number.


REFERENCES:
patent: 5526403 (1996-06-01), Tam
patent: 5771465 (1998-06-01), Bojeryd
patent: 5924030 (1999-07-01), Rautiola et al.

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