Sang H Hyun

US Patent:

6901061, May 31, 2005

Filed:

Sep 5, 2000

Appl. No.:

09/655102

Inventors:

Ki Hyun Joo - San Jose CA, US
Peter S. Rha - Santa Clara CA, US
Chol Su Kang - Fremont CA, US
Sang Kyoon Hyun - Santa Clara CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04B007/216

US Classification:

370335, 370331, 370442, 370338

Abstract:

A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the BTS, BSC and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner. Handling handoff requests in this manner prevents unnecessary ping-ponging of handoff and can also increase the percentage of successful handoff by frequency monitoring of the quality of the mobile communication units located in the handoff transition area, particularly to the public communication system.

US Patent:

6967938, Nov 22, 2005

Filed:

Apr 25, 2000

Appl. No.:

09/557666

Inventors:

Chol Su Kang - Fremont CA, US
Sang Kyoon Hyun - Santa Clara CA, US
Ki Hyun Joo - San Jose CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04B007/216

US Classification:

370335, 370331, 370315

Abstract:

A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller, and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. The interface module provides for coupling the WIBS to an ethernet back-bone, a mobile communication unit and a public switch telephone network (PSTN). In one embodiment, the wireless communication system includes a wireless internet server which also encompasses base station controller and mobile switch controller functions to enable the wireless communication system to manage call mobility with the system. In one embodiment, communication between the WIBS and the PSTN is in an IP data protocol format. The WIBs provides control and sequencing of all call control operations by handling both voice and data calls which are transmitted over the ethernet back-bone to the PSN or the internet.

US Patent:

7016331, Mar 21, 2006

Filed:

Sep 5, 2000

Appl. No.:

09/655107

Inventors:

Ki Hyun Joo - San Jose CA, US
Peter S. Rha - Santa Clara CA, US
Chol Su Kang - Fremont CA, US
Sang Kyoon Hyun - Santa Clara CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04Q 7/00

US Classification:

370334, 370335, 370342, 455440

Abstract:

A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the base station transceiver subsystem BTS, BSC, and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner. Handling handoff requests in this manner prevents unnecessary ping-ponging of hand off and can also increase the percentage of successful handoff by frequency monitoring of the quality of the mobile communication units located in the handoff transition area, particularly to the public communication system.

US Patent:

7154870, Dec 26, 2006

Filed:

Aug 5, 2005

Appl. No.:

11/198651

Inventors:

Ki Hyun Joo - San Jose CA, US
Peter S. Rha - Santa Clara CA, US
Chol Su Kang - Fremont CA, US
Sang Kyoon Hyun - Santa Clara CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04Q 7/00

US Classification:

370334, 370335, 370342, 455440

Abstract:

A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller (BSC), a mobile switch controller (MSC), and an ethernet interface module for coupling the wireless internet base station (WIBS) to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the base station transceiver subsystem BTS, BSC, and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner. Handling handoff requests in this manner prevents unnecessary ping-ponging of hand off and can also increase the percentage of successful handoff by frequency monitoring of the quality of the mobile communication units located in the handoff transition area, particularly to the public communication system.

US Patent:

7813385, Oct 12, 2010

Filed:

Mar 1, 2004

Appl. No.:

10/791441

Inventors:

Sang Kyoon Hyun - Campbell CA, US
Bretton Douglas - Sunnyvale CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04J 3/06
H04J 3/07
H04B 17/00

US Classification:

370508, 370503, 370519, 455 6716

Abstract:

Systems and methods for adapting IEEE 802. 11 wireless communications for environments involving long propagation delays. Improved system throughput and stability are provided. Propagation delays are measured systematically and used to adjust contention timing boundaries and a common time slot duration. This reduces the probability of collision in the CSMA/CA mode of the IEEE 802. 11 standard. One particular application is a point-to-multipoint campus bridge network.

US Patent:

7965685, Jun 21, 2011

Filed:

Apr 18, 2005

Appl. No.:

11/108260

Inventors:

Ki Hyun Joo - San Jose CA, US
Peter S. Rha - Santa Clara CA, US
Chol Su Kang - Fremont CA, US
Sang Kyoon Hyun - Santa Clara CA, US

Assignee:

Cisco Technology, Inc. - San Jose CA

International Classification:

H04W 4/00

US Classification:

370331, 370442, 455436

Abstract:

A wireless office communication system including a wireless internet base station (WIBS) encompassing a base station controller, a mobile switch controller and an ethernet interface module for coupling the WIBS to an existing internet protocol (IP) based network. A wireless office communication system can also be based on the conventional architecture comprising the BTS, BSC and MSC. The WIBS or BTS is attached to a number of antennas via different and identifiable delay elements for the purpose of determining the serving antennas of mobile communication units. A location determination logic enables the system to handle handoffs between a WIBS or BTS and the external public communication system in an optimum manner. Handling handoff requests in this manner prevents unnecessary ping-ponging of handoff and can also increase the percentage of successful handoff by frequency monitoring of the quality of the mobile communication units located in the handoff transition area, particularly to the public communication system.