Use of ISDN to provide wireless office environment connection to the public land mobile network
First Claim
1. A wireless communications system comprising:
- a private cellular telephone system providing service only to first mobile stations, the private cellular telephone system including a first switching node connected to a plurality of first base stations in radio frequency communication with the first mobile stations;
a public cellular telephone system providing service to second mobile stations, the second mobile stations including at least one first mobile station, the public cellular telephone system including a second switching node connected to a plurality of second base stations in radio frequency communication with the second mobile stations and the at least one first mobile station, the second switching node further connected to a home location register;
an integrated services digital network interconnecting the first switching node, the second switching node and the home location register for carrying reformatted signaling system no. 7 message communication including;
a first mB+D connection with the first mobile switching center;
a second mB+D connection with the second mobile switching center; and
a third mB+D connection with the home location register;
a first protocol converter for the first switching node connected to the first mB+D connection to provide a Signaling Connection Control Part (SCCP) emulation functionality for formatting signaling system no. 7 messages for communication to and from the second switching node and home location resister over the integrated services digital network;
a second protocol converter for the second switching node connected to the second mB+D connection to provide an SCCP emulation functionality for formatting signaling system no. 7 messages for communication to and from the first switching node and home location register over the integrated services digital network; and
a third protocol converter for the home locating register connected to the third mB+D connection to provide an SCCP emulation functionality for formatting signaling system no. 7 messages for communication to and from the first and second switching nodes over the integrated services digital network.
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Accused Products
Abstract
An integrated services digital network (ISDN) connection is maintained between a wireless office environment type private cellular telephone system and a public access cellular telephone system. In particular, an mB+D ISDN connection (where m=2, 23 or 30) is maintained between the ISDN network and each of a wireless office environment mobile switching center (WOE-MSC), a public land mobile network mobile switching center (PLMN-MSC) and a home location register (PLNN-HLR). A protocol converter is provided in each of these nodes to convert between the Transaction Capabilities Application Part (TCAP) message Signaling Connection Control Part (SCCP) supported signaling system no. 7 (SS7) message formats and the ISDN format. During registration, call delivery and hand off, an ISDN call communication is established between the wireless office environment type private cellular telephone system and the public access cellular telephone system. The SS7 messages are then exchanged between the systems over the D channel. Any necessary speech connection is then carried over one of the m available B channels.
140 Citations
25 Claims
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1. A wireless communications system comprising:
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a private cellular telephone system providing service only to first mobile stations, the private cellular telephone system including a first switching node connected to a plurality of first base stations in radio frequency communication with the first mobile stations; a public cellular telephone system providing service to second mobile stations, the second mobile stations including at least one first mobile station, the public cellular telephone system including a second switching node connected to a plurality of second base stations in radio frequency communication with the second mobile stations and the at least one first mobile station, the second switching node further connected to a home location register; an integrated services digital network interconnecting the first switching node, the second switching node and the home location register for carrying reformatted signaling system no. 7 message communication including; a first mB+D connection with the first mobile switching center; a second mB+D connection with the second mobile switching center; and a third mB+D connection with the home location register; a first protocol converter for the first switching node connected to the first mB+D connection to provide a Signaling Connection Control Part (SCCP) emulation functionality for formatting signaling system no. 7 messages for communication to and from the second switching node and home location resister over the integrated services digital network; a second protocol converter for the second switching node connected to the second mB+D connection to provide an SCCP emulation functionality for formatting signaling system no. 7 messages for communication to and from the first switching node and home location register over the integrated services digital network; and a third protocol converter for the home locating register connected to the third mB+D connection to provide an SCCP emulation functionality for formatting signaling system no. 7 messages for communication to and from the first and second switching nodes over the integrated services digital network. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for communicating signaling system no. 7 messages over an integrated services digital network from a first communications switching node to a second communications switching node, comprising the steps of:
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establishing an integrated services digital network call connection between the first and second communications switching nodes; converting at the first communications switching node an originated signaling system no. 7 message to a format suitable for transmission over a D channel of the established integrated services digital network call connection; sending the converted message over the D channel to the second communications switching node; and converting at the second communications switching nod the sent converted message format received from the channel back to the originated signaling system no. 7 message. - View Dependent Claims (9, 10, 11, 12)
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13. A method for performing a hand off of a mobile station call from a first cellular communications system to a second cellular communications system wherein the first and second cellular communications systems are interconnected by an integrated services digital network, comprising the steps of:
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establishing an integrated services digital network call connection between communications switches of the first and second cellular communications systems; exchanging signaling system no. 7 based hand off signaling messages between the communications switches of the first and second cellular communications systems via converted hand off signaling message transmissions over D channel of the established integrated services digital network call connection; and routing the mobile station call between communications switches of the first and second cellular communications systems over a B channel of the established integrated services digital network call connection to effectuate hard. - View Dependent Claims (14, 15, 16, 17)
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18. A method for delivering an incoming call received at a communications switch of a first cellular communications system to mobile station served by a communications switch of a second cellular communications system wherein the communications switches of the first and second cellular communications systems are interconnected by an integrated services digital network, comprising the steps of:
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establishing an integrated services digital network call connection between the communications switches of a first and second cellular communications systems; exchanging signaling system no. 7 based call delivery signaling messages between the communications switches of the first and second cellular communications systems via converted call delivery signaling message transmissions over a D channel of the established integrated services digital network call connection; and routing the incoming call between the communications switches of the first and second cellular communications systems over a B channel of the established integrated services digital network call connection for delivery to the mobile station by the second cellular communications system. - View Dependent Claims (19, 20, 21)
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22. A method for registering a mobile station served by a communications switch of a first cellular communications system with a home location register of a second cellular communications system wherein the communications switch and home location register of the first and second cellular communications systems, respectively, are interconnected by an integrated services digital network, comprising the steps of:
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establishing an integrated services digital network call connection between the communications switch and home location register of the first and second cellular communications systems; and exchanging signaling system no. 7 based registration signaling messages between the communications switch and home location register of the first and second cellular communications systems via converted registration signaling message transmissions over a D channel of the established integrated services digital network call connection to register the mobile station in the home location register. - View Dependent Claims (23, 24, 25)
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Specification