Cellular adjunct to a public wired network

• US 5,953,651 A
• Filed: 10/11/1996
• Issued: 09/14/1999
• Est. Priority Date: 05/04/1995
• Status: Expired due to Fees

• Current Assignee: LGC Wireless Incorporated (TE Connectivity Limited)
• Original Assignee: Interwave Communications International SA (Alvarion Limited)
• Inventors: Lu, Priscilla Marilyn, White, Timothy Richard
• Primary Examiner(s): Dolinar, Andrew M.
• Application Number:
  US08/730,642
• Time in Patent Office: 1,068 Days
• Field of Search: 455/406, 455/408, 455/445, 455/463, 455/465, 455/554, 455/560
• US Class Current: 455/408
• CPC Class Codes: H04W 68/12 Inter-network notification
• CPC Class Codes: H04W 84/16 WPBX [Wireless Private Branch Exchange]

Abstract

A cellular adjunct system for extending telephone service provided by a wired telephone network to a cellular handsets without incurring the costs associated with implementing a full-featured cellular system. The cellular adjunct system includes a base station subsystem and a cellular adjunct control block. The base station subsystem includes radio resource management facilities for permitting the plurality of cellular handsets to communicate with the base station subsystem in a cellular manner. The cellular adjunct control block, which is coupled between the base station subsystem and switching networks in the public wired telephone network, includes a registry, a mobile switching center, and a mini-central office. From the perspective of the public wired telephone network, the cellular handsets appear to be wired telephone sets that are managed by the cellular adjunct control block. The fact that the cellular adjunct system offers wireless advantages typically associated with a standard full-featured cellular system is transparent to the public wired telephone network. When subscriber management for the cellular handsets is handled by the public wired telephone network, the implementation of the cellular adjunct system is substantially simplified.

Claims

1. A cellular adjunct system for extending telephone service offered by a public wired telephone network to a plurality of cellular handsets, said public wired telephone network having wired telephone sets and an operation and maintenance center for managing subscriber data related to both said wired telephone sets and said plurality of cellular handsets, said cellular adjunct system facilitating cellular communication among said plurality of cellular handsets and between said plurality of cellular handsets and said wired telephone sets, said cellular adjunct system being coupled to a base station subsystem, said base station subsystem including radio resource management facilities for permitting said plurality of cellular handsets to communicate with said base station subsystem in a cellular manner, said cellular adjunct system comprising:

a cellular adjunct control block coupled between said base station subsystem and switching networks in said public wired telephone network, said cellular adjunct control block including;

a registry containing routing data related to said plurality of cellular handsets to facilitate routing calls thereto, said routing data including data indicating whether a particular cellular handset in said plurality of cellular handsets is available for receiving a call;

a mobile switching center coupled to said registry, said mobile switching center facilitates switching of calls among said plurality of cellular handsets; and

a mini-central office coupled to said registry and said mobile switching center, said mini-central office ascertaining whether signaling data from a first cellular handset of said cellular handsets relates to an internal call or an external call, said internal call being a call between said first cellular handset and a second cellular handset of said plurality of cellular handsets, said external call being a call between said first cellular handset and one of said wired telephone sets in said public wired telephone network, wherein said mini central office utilizes said mobile switching center for switching said internal call if said signaling data relates to said internal call, said signaling data is forwarded to said public wired telephone network for switching said external call if said signaling data relates to said external call, wherein bearer data channels for said internal calls are processed through a transcoder-rate adapter unit only if they facilitate communication among cellular handsets that communicate at different rates.

2. The cellular adjunct system of claim 1 wherein said cellular adjunct control block is coupled to said switching networks via an existing central office in said public wired telephone network.

3. The cellular adjunct system of claim 2 wherein said cellular adjunct control block is coupled to said existing central office using a wireless link.

4. The cellular adjunct system of claim 2 wherein said base station subsystem includes at least a base station controller and a base transmitter station, wherein each of said cellular handsets is confined to a home location area that is equal to a domain of a base transmitter station in said base station for the purpose of initiating and receiving a call.

5. The cellular adjunct system of claim 1 wherein said base station subsystem is a standard GSM base station subsystem.

6. The cellular adjunct system of claim 1 wherein said plurality of cellular handsets represent standard GSM handsets.

7. The cellular adjunct system of claim 1 wherein said base station subsystem includes at least a base station controller and a base transmitter station, wherein each of said cellular handsets is confined to a home location area that is equal to a domain of a base transmitter station in said base station for the purpose of initiating and receiving a call.

8. The cellular adjunct system of claim 1 wherein said cellular adjunct control block includes facilities for gathering billing data relating to usage by said plurality of cellular handsets.

9. The cellular adjunct system of claim 8 wherein said billing data is forwarded to said public network, thereby centralizing processing of billing for both said plurality of cellular handsets and said wired telephone sets.

15. The cellular adjunct system of claim 9 wherein said base station subsystem is a standard GSM base station subsystem.

16. The cellular adjunct system of claim 9 wherein said plurality of cellular handsets represent standard GSM handsets.

17. The cellular adjunct system of claim 9 wherein said base station subsystem includes at least a base station controller and a base transmitter station, wherein each of said cellular handsets is confined to a home location area that is equal to a domain of a base transmitter station in said base station for the purpose of initiating and receiving a call.

10. A cellular adjunct system for extending telephone service offered by a public wired telephone network to a plurality of cellular handsets, said public wired telephone network having wired telephone sets and an operation and maintenance center for managing subscriber data related to both said wired telephone sets and said plurality of cellular handsets, said cellular adjunct system facilitating cellular communication among said plurality of cellular handsets and between said plurality of cellular handsets and said wired telephone sets, said cellular adjunct system being coupled to a base station subsystem said base station subsystem including radio resource management facilities for permitting said plurality of cellular handsets to communicate with said base station subsystem in a cellular manner, said cellular adjunct system comprising:

a cellular adjunct control block coupled between said base station subsystem and switching networks in said public wired telephone network said cellular adjunct control block including;

a registry containing routing data related to said plurality of cellular handsets to facilitate routine calls thereto, said routing data including data indicating whether a particular cellular handset in said plurality of cellular handsets is available for receiving a call;

a mobile switching center coupled to said registry, said mobile switching center facilitates switching of calls among said plurality of cellular handsets; and

a mini-central office coupled to said registry and said mobile switching center, said mini-central office ascertaining whether signaling data from a first cellular handset of said cellular handsets relates to an internal call or an external call, said internal call being a call between said first cellular handset and a second cellular handset of said plurality of cellular handsets, said external call being a call between said first cellular handset and one of said wired telephone sets in said public wired telephone network, wherein said mini central office utilizes said mobile switching center for switching said internal call if said signaling data relates to said internal call, said signaling data is forwarded to said public wired telephone network for switching said external call if said signaling data relates to said external call said cellular adjunct control block includes facilities for gathering billing data relating to usage by said plurality of cellular handset wherein said billing data is forwarded to said public network, thereby centralizing processing of billing for both said plurality of cellular handsets and said wired telephone sets.

11. The cellular adjunct system of claim 10 wherein bearer data channels for said internal calls are processed through a transcoder-rate adapter unit only if they facilitate communication among cellular handsets that communicate at different rates.

12. The cellular adjunct system of claim 10 wherein said cellular adjunct control block is coupled to said switching networks via an existing central office in said public wired telephone network.

13. The cellular adjunct system of claim 12 wherein said cellular adjunct control block is coupled to said existing central office using a wireless link.

14. The cellular adjunct system of claim 12 wherein said base station subsystem includes at least a base station controller and a base transmitter station, wherein each of said cellular handsets is confined to a home location area that is equal to a domain of a base transmitter station in said base station for the purpose of initiating and receiving a call.

18. A method for extending telephone service offered by a public wired telephone network to a plurality of standard cellular handsets without implementing a standard cellular network, said plurality of standard cellular handsets communicating with a base station subsystem having a base station controller and a base transceiver station in a cellular manner via radio resource management facilities therein, said method comprising:

restricting the mobility of each of said plurality of standard cellular handsets to a single base transceiver station;

providing a cellular adjunct control block coupled between said base station subsystem and switching networks in said public wired telephone network, said cellular adjunct control block including;

a registry containing cellular handset data related to said plurality of standard cellular handsets to facilitate routing calls thereto, said cellular handset data including data indicating a home base transceiver station of a given standard cellular handset of said plurality of standard cellular handsets and whether said given cellular handset in said plurality of cellular handsets is available for receiving a call;

a mobile switching center coupled to said registry, said mobile switching center facilitates switching calls among said plurality of cellular handsets; and

a mini-central office coupled to said registry and said mobile switching center, said mini-central office ascertaining whether signaling data from a first cellular handset of said cellular handsets relates to an internal call or an external call, said internal call being a call between said first cellular handset and a second cellular handset of said plurality of cellular handsets and said external call being a call between said first cellular handset and a wired telephone set in said public wired telephone network, wherein said mini central office utilizes said mobile switching center for switching said internal call if said signaling data relates to said internal call while said signaling data is forwarded to said public wired telephone network for switching said external call if said signaling data relates to said external call, wherein said public wired telephone network routes calls to and from said plurality of cellular handsets via said cellular adjunct control block as if said plurality of cellular handsets were wired telephones in said public wired telephone network; and

furnishing subscriber data related to said plurality of standard cellular handsets to said public wired telephone network to centralize subscriber services related to said plurality of standard cellular handsets.

19. The method of claim 18 further comprising the step of forwarding, using said cellular adjunct control block, billing data related to cellular usage by said plurality of standard cellular handsets to said public wired telephone network to centralize billing services related to said plurality of standard cellular handsets through said public wired telephone network.

20. The method of claim 18 wherein said plurality of standard cellular handsets represent standard GSM handsets.

21. The method of claim 18 further comprising processing a bearer data channels for said internal call through a transcoder-rate adapter unit only if said internal call facilitates communication among cellular handsets that communicate at different rates.

22. The method of claim 18 wherein said providing said cellular adjunct control block includes coupling said cellular adjunct control block to said switching networks via an existing central office in said public wired telephone network.

23. The method of claim 22 wherein said cellular adjunct control block is coupled to said existing central office using a wireless link.

24. The method of claim 22 wherein said base station subsystem includes at least a base station controller and a base transmitter station, wherein each of said cellular handsets is confined to a home location area that is equal to a domain of a base transmitter station in said base station for the purpose of initiating and receiving a call.

25. The method of claim 18 wherein said base station subsystem is a standard GSM base station subsystem.

26. The method of claim 18 wherein said plurality of cellular handsets represent standard GSM handsets.

27. The method of claim 18 wherein said base station subsystem includes at least a base station controller and a base transmitter station, wherein each of said cellular handsets is confined to a home location area that is equal to a domain of a base transmitter station in said base station for the purpose of initiating and receiving a call.