Cellular private branch exchanges

United States Patent im

Lu et al.

[54] CELLULAR PRIVATE BRANCH EXCHANGES

[75] Inventors: Priscilla Marilyn Lu, San Carlos;

Timothy Richard White. Palo Alto,
both of Calif.

[73] Assignee: interWAVE Communications
International, Ltd.. Bermuda

[21] Appl. No.: 435,709
[22] Filed: May 4, 1995

[51] Int CI.6 H04M 11/00; H04Q 7/00

[52] U.S. CI 379/58; 379/59; 455/33.2

[58] Field of Search 379/58-63. 56-57;

455/33.2. 33.4, 54.2. 56.1; 370/58.1. 59,

60

[56] References Cited

U.S. PATENT DOCUMENTS

4.726,014 2/1988 Goldman et al 370/58

5.386.466 1/1995 Bales et al 379/220

5.442,633 8/1995 Perkins et al 370/94.1

5,479,483 12/1995 Furuya et al 379/59

5.504,804 4/1996 Widmark et al 379/59

5,506,837 4/1996 Sollner et al 379/60

5306,887 4/1996 Emery et al 379/58

5.528,668 6/1996 Aihara 379/60

5.530,945 6/1996 Chavez, Jr. et al 379/63

5.533,099 7/1996 Byrne 379/58

FOREIGN PATENT DOCUMENTS

462 727 A2 12/1991 European Pat. Off. H04Q 7/04

462 728 A2 12/1991 European Pat. Off. H04Q 7/04

566 407 A2 10/1993 European Pat. Off. H04Q 7/04

587 211 A2 3/1994 European Pat. Off. H04Q 7/04

595 392 Al 5/1994 European Pat. Off. H04Q 7/04

600 681 Al 6/1994 European Pat. Off. H04Q 7/26

MIIIMIIIIIIII

US005734699A [11] Patent Number: 5,734,699 [45] Date of Patent: Mar. 31, 1998

605 086 Al 7/1994 European Pat. Off. H04Q 7/04

605 311 Al 7/1994 European Pat. Off. H04B 7/26

WO 93/11625 6/1993 WIPO H94M 11/00

WO 94/05126 3/1994 WIPO H04Q 7/04

WO 94/25073 11/1994 WIPO H04Q 7/04

WO 95/24789 9/1995 WIPO .

OTHER PUBLICATIONS

J.B. Hollis. "Air Interface, Protocols for a National Mobile Data Network," IEE Collq. (1993) No. 003: Cordless Computing—Systems and User Experience, pp. 1-5.

Primary Examiner—Curtis Kuntz

Assistant Examiner—Binh K. Tieu

Attorney, Agent, or Firm—Hickman Beyer & Weaver

[57] ABSTRACT

A cellular private branch exchange for facilitating cellular communication for a first plurality of mobile station units, which includes a first base station subsystem for communicating with a first and a second mobile station unit of the first plurality of mobile station units on respectively a first and a second cellular bearer data channel. The cellular private branch exchange further includes a cellular private branch exchange unit coupled to the first base station subsystem. In turn, the cellular private branch exchange unit includes a private mobile-services switching center for providing mobility management for the first plurality of mobile station units, the private mobile-services switching center representing a first cross-connect node capable of crossconnecting the first bearer data channel with the second bearer data channel for calls between the first and the second mobile station units. Further the cellular private branch exchange unit includes a private registry coupled to the private mobile-services switching center, the private registry storing subscriber information pertaining to the first plurality of mobile station units.

11 Claims, 28 Drawing Sheets