William F Arbaugh

Author:

William A. Arbaugh

ISBN #:

0321136209

US Patent:

7400604, Jul 15, 2008

Filed:

May 31, 2005

Appl. No.:

11/141179

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Jun Jang - Suwon-si, KR
Min-Ho Shin - Laurel MD, US
William Albert Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbelt MD, US

Assignee:

Samsung Electronics Co., Ltd.
The University of Maryland College Park - College Park MD

International Classification:

H04Q 7/00

US Classification:

370332, 370331, 370329, 455439, 455436

Abstract:

Provided is a probing method for handoff including constructing a group of neighbor access points of a current access point with which the station associated, generating subgroups of the neighbor access points by the channel assigned to the access points, probing the access points by subgroup in a subgroup selection order, and selecting the neighbor access point having best link quality as a target access point to handoff. The probing method of the present invention is implemented with a novel non-overlap graph for constructing the neighbor graph such that the probing latency is dramatically reduced, resulting in reduction of handoff delay.

US Patent:

7421268, Sep 2, 2008

Filed:

May 24, 2007

Appl. No.:

11/753180

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Hun Jang - Suwon-si, KR
Min-Ho Shin - Laurel MD, US
William Albert Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbelt MD, US

Assignee:

Samsung Electronics Co., Ltd.
The University of Maryland, College Park - College Park MD

International Classification:

H04M 1/66
H04Q 7/20

US Classification:

455411, 455410, 4554321

Abstract:

A roaming service method for a fast and secure wireless network is provided. In an embodiment of the present invention, an AP, which an STA associates with, transmits proactive keys needed for roaming to neighbor APs of the AP. When the STA moves to one of the neighbor APs, a reassociation is carried out between the STA and the neighbor AP using the already provided proactive key. In another embodiment of the present invention, an authentication server transmits proactive keys needed for roaming to neighbor APs to which the STA is likely to move, so that when the STA moves to one of the neighbor APs, a reassociation is carried out between the STA and the neighbor AP using the already provided proactive key.

US Patent:

7756510, Jul 13, 2010

Filed:

May 12, 2006

Appl. No.:

11/433679

Inventors:

In-Sun Lee - Seoul, KR
Sang-Boh Yun - Seongnam-si, KR
William Albert Arbaugh - Ellicott City MD, US
T. Charles Clancy - College Park MD, US
Min-Ho Shin - Laurel MD, US

Assignee:

Samsung Electronics Co., Ltd. - Suwon-si

International Classification:

H04M 1/66
G06F 7/04
H04L 9/00
H04L 9/32

US Classification:

455411, 726 4, 380270, 380277, 713168, 713171

Abstract:

The present invention relates to an authentication method for wireless distribution system including at least one base station providing access service to mobile stations in a coverage of the base station. In the authentication method, an unregistered base station receives an authentication request from a mobile station, multicast an identity request for identifying the mobile station over the wireless distribution system, receives identity responses from at least one base station in response to the identity request, and performs authentication of the mobile station on the basis of the identity responses. The distributed authentication method of the present invention is performed without AAA server, when a new base station is installed or isolated base stations are joined, such that it is possible to extend the network in an easy manner without degradation of the security degree and additional labor burden of the operator.

US Patent:

7929948, Apr 19, 2011

Filed:

Aug 15, 2008

Appl. No.:

12/192699

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Hun Jang - Suwon-si, KR
Min-Ho Shin - Laurel MD, US
William Albert Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbelt MD, US

Assignee:

Samsung Electronics Co., Ltd.
The University of Maryland, College Park - College Park MD

International Classification:

H04M 1/66
H04W 4/00

US Classification:

455411, 370338

Abstract:

A roaming service method for a fast and secure wireless network is provided. In an embodiment of the present invention, an AP, which an STA associates with, transmits proactive keys needed for roaming to neighbor APs of the AP. When the STA moves to one of the neighbor APs, a reassociation is carried out between the STA and the neighbor AP using the already provided proactive key. In another embodiment of the present invention, an authentication server transmits proactive keys needed for roaming to neighbor APs to which the STA is likely to move, so that when the STA moves to one of the neighbor APs, a reassociation is carried out between the STA and the neighbor AP using the already provided proactive key.

US Patent:

7263357, Aug 28, 2007

Filed:

Jan 8, 2004

Appl. No.:

10/752675

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Hun Jang - Suwon-si, KR
Min-Ho Shin - Laurel MD, US
William Albert Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbett MD, US

Assignee:

Samsung Electronics Co., Ltd.
The University of Maryland - College Park MD

International Classification:

H04Q 7/20
H04M 1/66

US Classification:

4554321, 455410, 455436, 4554351

Abstract:

A roaming service method for a fast and secure wireless network is provided. In an embodiment of the present invention, an AP, which an STA associates with, transmits security keys needed for roaming to neighbor APs of the AP. When the STA moves to one of the neighbor APs, a reassociation is carried out between the STA and the neighbor AP using the already provided security key. In another embodiment of the present invention, an authentication server transmits security keys needed for roaming to neighbor APs to which the STA is likely to move, so that when the STA moves to one of the neighbor APs, a reassociation is carried out between the STA and the neighbor AP using the already provided security key.

US Patent:

20050083887, Apr 21, 2005

Filed:

Dec 3, 2004

Appl. No.:

11/003210

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Hun Jang - Suwon-si, KR
Min-Ho Shin - Laurel MD, US
William Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbelt MD, US

Assignee:

SAMSUNG ELECTRONICS CO., LTD. - GYEONGGI-DO
THE UNIVERSITY OF MARYLAND COLLEGE PARK - COLLEGE PARK MD

International Classification:

H04B007/212

US Classification:

370331000, 370338000

Abstract:

A method for minimizing handoff latencies when a handoff is performed in a wireless network. An access point (AP) or base station associated to a current wireless station (STA) allows information required for a reassociation to the STA to be propagated to handoff-capable neighboring APs or base stations. When the STA moves, a neighboring AP or base station performs the reassociation to the STA on the basis of context. When a handoff procedure is performed, the time taken to receive context of a corresponding STA is reduced, such that a fast handoff can be implemented.

US Patent:

20050117524, Jun 2, 2005

Filed:

Nov 10, 2003

Appl. No.:

10/703516

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Hun Jang - Gysonggi-do, KR
William Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbelt MD, US

Assignee:

SAMSUNG ELECTRONICS CO., LTD. - KYUNGKI-DO

International Classification:

H04L012/28
H04Q007/00

US Classification:

370254000, 370331000

Abstract:

A method for minimizing handoff latencies when a handoff is performed in a wireless network. An access point (AP) or base station associated to a current wireless station (STA) allows information required for a reassociation to the STA to be propagated to handoff-capable neighboring APs or base stations. When the STA moves, a neighboring AP or base station performs the reassociation to the STA on the basis of context. When a handoff procedure is performed, the time taken to receive context of a corresponding STA is reduced, such that a fast handoff can be implemented.

US Patent:

20050141457, Jun 30, 2005

Filed:

Dec 3, 2004

Appl. No.:

11/003211

Inventors:

In-Sun Lee - Seoul, KR
Kyung-Hun Jang - Suwon-si, KR
Min-Ho Shin - Laurel MD, US
William Arbaugh - Ellicott City MD, US
Arunesh Mishra - Greenbelt MD, US

Assignee:

SAMSUNG ELECTRONICS CO., LTD. - GYEONGGI-DO
THE UNIVERSITY OF MARYLAND COLLEGE PARK - COLLEGE PARK MD

International Classification:

H04B007/212

US Classification:

370331000

Abstract:

A method for minimizing handoff latencies when a handoff is performed in a wireless network. An access point (AP) or base station associated to a current wireless station (STA) allows information required for a reassociation to the STA to be propagated to handoff-capable neighboring APs or base stations. When the STA moves, a neighboring AP or base station performs the reassociation to the STA on the basis of context. When a handoff procedure is performed, the time taken to receive context of a corresponding STA is reduced, such that a fast handoff can be implemented.