Telephone registration and cancellation control in a wide area cordless telephone system

Claim 3

A wide area cordless telephone system for covering a service area which is divided into a plurality of local service areas, each of said service areas being identified by a unique area code, comprising: a central controller located in each of said local service areas for transmitting a pre-registration polling signal containing a unique area code of the own local service area at periodic intervals; a plurality of cordless telephones, each having means for receiving said pre-registration polling signal and transmitting a pre-registration response signal if said area code contained in the received polling signal mismatches a unique area code stored therein, updating the stored area code with an area code contained in an acknowledgement signal received from said central controller, and transmitting a post-registration signal at periodic intervals upon receipt of said acknowledgement signal; said central controller including means for making a registration of a cordless telephone in response to said pre-registration response signal and transmitting said acknowledgement signal and detecting said post-registration signal and cancelling said registration in the absence of the detected post-registration signal for a prescribed time interval.

Claim 4

A wide area cordless telephone system for covering a service area which is divided into a plurality of local service areas, each of said service areas being identified by a unique area code, comprising: a central controller located in each of said local service areas for transmitting a pre-registration polling signal containing a unique area code of the own local service area at periodic intervals; a plurality of cordless telephones, each having means for receiving said pre-registration polling signal and transmitting a pre-registration response signal if said area code contained in the received polling signal mismatches a unique area code stored therein, updating the stored area code with an area code contained in an acknowledgement signal received from said central controller, and transmitting a post-registration signal at periodic intervals upon receipt of said acknowledgement signal; said central controller including means for making a registration of a cordless telephone in response to said pre-registration response signal and transmitting said acknowledgement signal and detecting said post-registration signal and cancelling said registration in the absence of the detected post-registration signal for a prescribed time interval.

Claim 5

A wide area cordless telephone system for covering a service area which is divided into a plurality of local service areas identified respectively by unique codes, comprising for each of said local service areas: a plurality of home position portable cordless stations each having a corresponding line terminal in a telephone switching system and a multi-channel access means for establishing a two-way radio link, each of said telephones having means for receiving a pre-registration polling signal and transmitting a pre-registration response signal if a unique code contained in the received pre-registration polling signal mismatches a stored unique code identifying the own local area and transmitting a post-registration signal at periodic intervals upon receipt of an acknowledgement signal; a plurality of fixed access units for establishing said radio link with each of said home position cordless stations and non-home position cordless stations belonging to another local area; and a pre-dialing switching stage for establishing a connection between said access units and line terminals of said telephone switching system, said switching stage including control means connected to said access units for transmitting said pre-registration polling signal through said access units to permit said home position and non-home position cordless stations to return said pre-registration response signal, assigning a reserved line terminal of said switching system to the registered cordless station, making a registration of a said cordless station in response to receipt of said pre-registration response signal therefrom, transmitting said acknowledgement signal upon registration of said telephone and cancelling said registration if said post-registration signal is not received from said registered telephone for a prescribed time interval.

Claim 6

A wide area cordless telephone system for covering a service area which is divided into a plurality of local service areas identified respectively by unique codes, comprising for each of said local service areas: a plurality of home position portable cordless stations each having a corresponding line terminal in a telephone switching system and a multi-channel access means for establishing a two-way radio link, each of said telephones having means for receiving a pre-registration polling signal and transmitting a pre-registration response signal if a unique code contained in the received pre-registration polling signal mismatches a stored unique code identifying the own local area and transmitting a post-registration signal at periodic intervals upon receipt of an acknowledgement signal; a plurality of fixed access units for establishing said radio link with each of said home position cordless stations and non-home position cordless stations belonging to another local area; and a pre-dialing switching stage for establishing a connection between said access units and line terminals of said telephone switching system, said switching stage including control means connected to said access units for transmitting said pre-registration polling signal through said access units to permit said home position and non-home position cordless stations to return said pre-registration response signal, assigning a reserved line terminal of said switching system to the registered cordless station, making a registration of a said cordless station in response to receipt of said pre-registration response signal therefrom, transmitting said acknowledgement signal upon registration of said telephone and cancelling said registration if said post-registration signal is not received from said registered telephone for a prescribed time interval.

Claim 7

A wide area cordless telephone system as claimed in claim 3, wherein each of said cordless stations includes means for transmitting said post-registration signal at periodic intervals, and wherein said controller includes means for determining a time lapse between successive ones of said making a registration of a said cordless station in response to receipt of said pre-registration response signal, post-registration signals and detecting when said time lapse exceeds said prescribed time interval to perform said cancellation.

Claim 8

A wide area cordless telephone system as claimed in claim 3, wherein said controller includes means for transmitting a post-registration polling signal and wherein each of said cordless stations returns a post-registration response signal on receiving said post-registration polling signal, wherein said controller further includes means for determining a time lapse between successive ones of said post-registration response signal and detecting when said time lapse exceeds said prescribed time interval to perform said cancellation.