Yong X Liu

7450521, Nov 11, 2008

Feb 11, 2005

11/055016

Jong-hun Park - Suwon-si, KR
Myung-jong Lee - New York NY, US
Yong Liu - New York NY, US
Xuhui Hu - New York NY, US

Samsung Electronics Co., Ltd. - Suwon
City University of New York - New York NY

G01R 31/08
G06F 11/00
G08C 15/00
H04J 1/16
H04J 3/14
H04L 1/00
H04L 12/26
H04L 12/28

370252, 370238, 370351

A routing method comprising receiving a first packet, the first packet being broadcast for discovery of a route. A first backoff of the first packet is calculated based on a route cost of the first packet. The first packet is rebroadcast if a second packet is not received within the first backoff, the second packet being a duplicate of the first packet. A second backoff of the second packet is calculated based on a route cost of the second packet if the second packet is received within the first backoff. One of the first and the second packets is rebroadcast as a result of comparing the first backoff and the second backoff.

7450553, Nov 11, 2008

Jul 26, 2004

10/898234

Jong-hun Park - Suwon-si, KR
Yong Liu - New York NY, US
Myung-jong Lee - New York NY, US
Xu-hui Hu - New York NY, US

Samsung Electronics Co., Ltd. - Suwon-si
City University of New York - New York NY

H04Q 7/24
H04J 3/00

370338, 370345

A system and method for selecting a starting point to transmit a beacon (BTSP) from a coordinator and a first node in a communication system. The communication system includes the coordinator, a first node group with at least one node having the first node which receives the beacon from the coordinator, and a second node group with at least one node having a second node which receives the beacon from the first node. The coordinator determines a beacon window size for the beacon transmission, selects the BTSP within the beacon window size, and transmits at the BTSP, the beacon containing information on the beacon window size and the BTSP. The first node selects its BTSP within the beacon window size so as not to overlap with the BTSP of the received beacon.

7511543, Mar 31, 2009

Feb 8, 2007

11/672737

Daniel J. Friedman - Sleepy Hollow NY, US
Yong Liu - Cambridge MA, US
Woogeun Rhee - Beijing, CN

International Business Machines Corporation - Armonk NY

H03L 7/06

327156, 327147, 327157, 327158, 327159

An instantaneous phase error detector (IPED) and method includes a first gate configured to logically OR output phase error signals as data to a first latch, and a second gate configured to logically combine the output phase error signals to clock the first latch. A delay element delays to the data to the first latch where the output of the first latch provides instantaneous phase error change information. A second latch is coupled to the output phase error signals to output a lead/lag signal to indicate which of the output phase error signals is leading. A phase-locked loop employing the output of the IPED is also disclosed along with static phase measurement and jitter optimization features.

7564786, Jul 21, 2009

Jan 26, 2005

11/042063

Yu-jin Lim - Seoul, KR
Myung-jong Lee - New York NY, US
Xu-hui Hu - New York NY, US
Yong Liu - New York NY, US
Chun-hui Zhu - New York NY, US

Samsung Electronics Co., Ltd. - Suwon
City University of New York - New York NY

H04J 3/16
G06F 15/16

370230, 370465, 709252

A method to manage nodes in a ZigBee network. In a ZigBee network including a plurality of nodes, a multicast group is generated including at least two nodes among the plurality of the nodes. A multicast group coordinator (GC) which manages the multicast group is set among the nodes forming the multicast group. The multicast group includes the GC, a multicast group member (GM) requesting to join the multicast group, and/or a multicast router (MR) which links GMs to each other or links the GC and the GC. Accordingly, since the GC manages the multicast group, the load is decreased and the packet data transmission rate is enhanced.

7583592, Sep 1, 2009

Aug 4, 2004

10/910649

Jong-hun Park - Suwon-si, KR
Yong Liu - New York NY, US
Myung-jong Lee - New York NY, US
Xu-hui Hu - New York NY, US
Tae-kyung Kwon - New York NY, US

Samsung Electronics Co., Ltd. - Suwon-si

H04L 12/26

370218, 370217, 370242

A route recovery method in a wireless network of a tree topology, in which a second node, which is a lower node of a first node and is disconnected from the first node, recovers the route in the network. The route recovery method includes the second node broadcasting a local repair request (LREQ) packet, each node receiving the LREQ packet sending a local repair reply (LREP) packet to the second node to act as a relay node for the route recovery, the second node selecting the relay node from among the nodes sending the LREP packet, and sending a local repair confirm (LCON) packet from the second node to the relay node, and establishing the route between the second node and the first node by the relay node sending a local repair inform (LINF) packet to the first node.

7656848, Feb 2, 2010

Jul 12, 2004

10/888024

Jong-hun Park - Suwon-si, KR
Yong Liu - New York NY, US
Myung-jong Lee - New York NY, US

Samsung Electronics Co., Ltd. - Suwon-si
City University of New York - New York NY

H04J 3/24

370338, 370349

A routing requesting method to transmit data to a device of a different piconets in a scatternet including at least two piconets which have a master device and at least one slave device controlled by the master device. A source device generates as a single packet an information inquiring a first radio resource used in each device of the piconet and an information requesting the routing. The source device broadcasts the packet to adjacent devices. The adjacent device, which receives the generated packet, sends the packet to a destination device by repeating the above process. The destination device assigns itself the master device, generates a RREP message including a clock information, and sends the generated RREP message to an adjacent device. The source device becomes aware of devices along the route using the information contained in the RREP message.

7899053, Mar 1, 2011

May 10, 2006

11/430957

Yong Liu - New York NY, US
Myung-jong Lee - New York NY, US

Samsung Electronics Co., Ltd. - Suwon-si
City University of New York - New York NY

H04L 12/28
H04W 40/00

370392, 455428, 455449

An optimal path routing method is provided for transmitting data from a source node to a destination node. The optimal path setting method includes transmitting a shortcut request (SCRQ) message from the source node to a topology server; determining shortcut information at the topology server based on the SCRQ message; and transmitting a shortcut notification (SCNF) message containing the shortcut information from the topology server to the destination node.

7961710, Jun 14, 2011

Feb 13, 2007

11/674351

Ji-Hoon Lee - Cheongju-si, KR
Xuhui Hu - New York NY, US
Yong Liu - New York NY, US
Myung-Jong Lee - New York NY, US

Samsung Electronics Co., Ltd. - Suwon-si
The Research Foundation of the City University of New York - New York NY

H04L 12/28

370351, 370338, 370432, 379219, 37922101

A method and apparatus is provided for setting multiple paths between wireless nodes of an ad-hoc network including a source node, a relay node and a destination node that receives a message from the source node via the relay node. The multi-path setting method and apparatus includes receiving previous hop address information, and determining whether a wireless node that receives the previous hop address information is included in an insulating region, based on the previous hop address information.