Wide area cordless telephone system capable of receiving incoming group address calls

Claim 2

A wide area cordless telephone system as claimed in claim 1, wherein each of said cordless stations transmits an off-hook signal through the respective speech channel to said control means via one of said access units if an off hook condition occurs following reception of said ringing signals, said control means transmitting ring trip signals through said access units to the cordless stations other than the cordless station which transmitted said off-hook signal.

Claim 3

A wide area cordless telephone system for covering a plurality of service areas in each of which a plurality of cordless stations are located, comprising: control means connected to a telephone network for generating an alert signal containing a plurality of pairing identifiers in response to an incoming call from the telephone network, and successively generating standby signals each containing a different one of said pairing identifiers; and a plurality of access units divided into groups corresponding respectively to said service areas, the access units of each group being located in the corresponding service area for establishing a radio control channel and a plurality of radio speech channels with the cordless stations located in the same service area as said access units, specified one of said access units being responsive to said alert signal for transmitting a copy of said alert signal to each of said cordless stations through said control channel and causing said cordless stations to successively return respective ones of said pairing identifiers through said control channel, said access units being respectively responsive to said standby signals for respectively storing a pairing identifier contained in a respective one of said standby signals, each of said access units being responsive to one of the pairing identifiers from said cordless stations for transmitting a speech-channel identifier to the cordless station specified by the stored pairing identifier through said control channel if said one of the pairing identifiers from said cordless stations is Identical to the stored pairing identifier and transmitting a ringing signal to said specified cordless station through a said speech channel specified by said transmitted speech-channel identifier.

Claim 4

A wide area cordless telephone system as claimed in claim 3, wherein each of said cordless stations transmits an off-hook signal through the respective speech channel to said control means via one of said access units if an off hook condition occurs following reception of said ringing signal, said control means transmitting ring trip signals through said access units to the cordless stations other than the cordless station which transmitted said off-hook signal.

Claim 5

A wide area cordless telephone system for covering a plurality of service areas in each of which a plurality of cordless stations are located, comprising: control means connected to a telephone network for generating an individual-call signal when an incoming call from said network is an individual call directed to one of the cordless stations and generating a group-call signal when said incoming call is a group call directed to all cordless stations located in a same service area; and a plurality of access units divided into groups corresponding respectively to said service areas, the access units of each group being located in the corresponding service area for establishing a radio control channel and a plurality of radio speech channels with the cordless stations located in the same service area as said access units, said access units being responsive to said individual-call signal for transmitting a speech-channel identifier to one of the cordless stations through said control channel and transmitting a ringing signal through a speech channel specified by said speech-channel identifier, and responsive to said group-call signal for successively transmitting speech-channel identifiers to said cordless stations through said control channel and transmitting group ringing signals respectively to said cordless stations through a plurality of said speech channels which are specified by said successively transmitted speech-channel identifiers.

Claim 6

A wide area cordless telephone system as claimed in claim 5, wherein each of said cordless stations transmits an off-hook signal through the respective speech channel to said control means via one of said access units if an off hook condition occurs following reception of said group ringing signals, said control means transmitting ring trip signals through said access units to the cordless stations other than the cordless station which transmitted said off-hook signal.

Claim 7

A wide area cordless telephone system for covering a plurality of service areas in each of which a plurality of cordless stations are located, comprising: control means connected to a telephone network for generating an individual-call signal when an incoming call from said network is an individual call directed to one of the cordless stations and generating a group alert signal containing a plurality of pairing identifiers when said incoming call is a group call directed to all cordless stations located in a same service area, and successively generating group standby signals each containing a different one of said pairing identifiers; and a plurality of access units divided into groups corresponding respectively to said service areas the access units of each group being located in the corresponding service area for establishing a radio control channel and a plurality of radio speech channels with the cordless stations located in the same service area as said access units, said access units being responsive to said individual-call signal for transmitting a speech-channel identifier to one of the cordless stations through said control channel and transmitting a ringing signal through a speech channel specified by said speech-channel identifier, a specified one of said access units being responsive to said group alert signal for transmitting a copy of said group alert signal to each of said cordless stations through said control channel and causing said cordless stations to successively return respective ones of said pairing identifiers through said control channel, and said access units being respectively responsive to said group standby signals for respectively storing a pairing identifier contained in a respective one of said group standby signals, each of said access units being responsive to one of the pairing identifiers from said cordless stations for transmitting a speech-channel identifier to the cordless station specified by the stored pairing identifier through said control channel if said one of the pairing identifiers from said cordless stations is identical to the stored pairing identifier and transmitting a group ringing signal to said specified cordless station through a said speech channel specified by said transmitted speech-channel identifier.

Claim 8

A wide area cordless telephone system as claimed in claim 7, wherein each of said cordless stations transmits an off-hook signal through the respective speech channel to said control means via one of said access units if an off hook condition occurs following reception of said group ringing signal, said control means transmitting ring trip signals through said access unit to the cordless stations other than the cordless station which transmitted said off-hook signal.