Patents by Inventor Derek Yu
Derek Yu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 8305897Abstract: One or more relay stations may be employed along a wireless communication access path between an ingress station and an egress station. A logical communication tunnel is established between the ingress and egress stations through any number of intermediate relay stations to handle session flows of PDUs. As PDUs arrive, the ingress station may determine and add scheduling information to the PDUs before they are delivered to the downstream intermediate relay stations or egress stations. The scheduling information is used by the downstream stations to schedule the PDUs for further delivery. The scheduling information may also be used by the egress station to schedule the PDUs for delivery. The scheduling information added to the PDU by the ingress station bears on a QoS class associated with the PDU, a deadline for the egress station to deliver the PDU, or a combination thereof.Type: GrantFiled: July 14, 2008Date of Patent: November 6, 2012Assignee: Apple Inc.Inventors: Hang Zhang, Peiying Zhu, Wen Tong, Gamini Senarath, Derek Yu, David G. Steer
-
Patent number: 8260337Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.Type: GrantFiled: January 25, 2011Date of Patent: September 4, 2012Assignee: Apple Inc.Inventors: Shalini Periyalwar, Hang Zhang, Nimal Senarath, Derek Yu, Kelvin Kar-Kin Au, Karl Mann
-
Publication number: 20120155376Abstract: A method selects a path for forwarding a data packet in a wireless communication system. A system capacity versus delay impact curve is calculated for a direct path to mobile station. The direct path has a capacity cost based on communication quality of a direct link between a base station and the mobile station. This curve is shifted by a predetermined time corresponding to an additional delay over a relay path to produce a projected capacity curve for the relay path having a second capacity cost determined according to a combined measure of signal quality of multiple links in the relay path. The second capacity cost is multiplied by a capacity cost ratio to produce a relay capacity curve. The direct path or the relay path is selected based on a comparison of the system capacity versus delay impact curve and the relay capacity curve according to a QoS requirement.Type: ApplicationFiled: February 27, 2012Publication date: June 21, 2012Applicant: ROCKSTAR BIDCO, LPInventors: Nimal Gamini SENARATH, Derek YU, Hang ZHANG, Israfil BAHCECI, Peiying ZHU, Wen TONG
-
Publication number: 20120152909Abstract: Embodiments of a tungsten inert gas (TIG) welding torch with an improved air cooled handle are provided. The welding torch may include a body, a cable assembly, and a torch head, with a handle placed over the body and the cable assembly. The handle may feature a curved end designed to fit near the torch head without contacting the torch head, providing a closer gripping point to allow greater control of the torch. In addition, the handle may be spaced from the body and the cable assembly to form an air space within the handle through which air may flow to cool the handle.Type: ApplicationFiled: December 12, 2011Publication date: June 21, 2012Applicant: Illinois Tool Works Inc.Inventor: Derek Yu-Fung Hung
-
Publication number: 20120152927Abstract: Systems and methods for improved liquid cooling of a tungsten inert gas (TIG) welding torch are provided. The improved welding torch may feature conduits for conveying coolant from a cooling system to a collar, which holds a tungsten electrode of the welding torch, and back. A coolant return conduit may be disposed in a coolant supply conduit to improve thermal insulation of an outer surface of the welding torch. Some embodiments may feature a helical channel formed in the collar for conveying coolant around the electrode multiple times before returning the coolant through the return conduit.Type: ApplicationFiled: December 12, 2011Publication date: June 21, 2012Applicant: Illinois Tool Works Inc.Inventor: Derek Yu-Fung Hung
-
Publication number: 20120152922Abstract: The invention provides a high flow power cable for a welding system designed for effective cooling of the power cable while maintaining maneuverability of the cable. Provided is a power cable having two segments, the first segment being larger in diameter than the second segment. The first segment is generally coupled to the power source and the second segment is coupled to the welding torch. The first segment includes a thicker wire, which has less resistance and dissipates less heat while the second segment includes a thinner wire, allowing for easier handling. Additionally, cooling fluid is conducted through the first segment and the second segment, further cooling the cable.Type: ApplicationFiled: December 12, 2011Publication date: June 21, 2012Applicant: Illinois Tool Works Inc.Inventor: Derek Yu-Fung Hung
-
Patent number: 8144597Abstract: A method selects a path for forwarding a data packet in a wireless communication system. A system capacity versus delay impact curve is calculated for a direct path to mobile station. The direct path has a capacity cost based on communication quality of a direct link between a base station and the mobile station. This curve is shifted by a predetermined time corresponding to an additional delay over a relay path to produce a projected capacity curve for the relay path having a second capacity cost determined according to a combined measure of signal quality of multiple links in the relay path. The second capacity cost is multiplied by a capacity cost ratio to produce a relay capacity curve. The direct path or the relay path is selected based on a comparison of the system capacity versus delay impact curve and the relay capacity curve according to a QoS requirement.Type: GrantFiled: December 31, 2008Date of Patent: March 27, 2012Assignee: Rockstar Bidco L.P.Inventors: Nimal Gamini Senarath, Derek Yu, Hang Zhang, Israfil Bahceci, Peiying Zhu, Wen Tong
-
Publication number: 20120009866Abstract: Methods and systems for providing efficient communications between two mobile stations served by the same base station or relay station are provided. A base station maintains information identifying which mobile stations it is serving. When a connection is set up between two mobile stations, if they are both being served by the same base station, the base station forwards traffic directly between the two mobile stations without forwarding it on to higher level network entities.Type: ApplicationFiled: September 20, 2011Publication date: January 12, 2012Applicant: ROCKSTAR BIDCO LPInventors: Hang Zhang, Peiying Zhu, Wen Tong, Nimal Gamini Senarath, Derek Yu
-
Patent number: 8023446Abstract: Methods and systems for providing efficient communications between two mobile stations served by the same base station or relay station are provided. A base station maintains information identifying which mobile stations it is serving. When a connection is set up between two mobile stations, if they are both being served by the same base station, the base station forwards traffic directly between the two mobile stations without forwarding it on to higher level network entities.Type: GrantFiled: September 28, 2007Date of Patent: September 20, 2011Inventors: Hang Zhang, Peiying Zhu, Wen Tong, Nimal Gamini Senarath, Derek Yu
-
Publication number: 20110201374Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.Type: ApplicationFiled: January 25, 2011Publication date: August 18, 2011Applicant: NORTEL NETWORKS LIMITEDInventors: SHALINI PERIYALWAR, HANG ZHANG, NIMAL SENARATH, DEREK YU, KELVIN KAR-KIN AU, KARL MANN
-
Patent number: 8000243Abstract: One or more relay stations may be employed along a wireless communication access path between an ingress station and an egress station. A logical communication tunnel is established between the ingress and egress stations through any number of intermediate relay stations to handle session flows of PDUs. As PDUs arrive, the ingress station may determine and add scheduling information to the PDUs before they are delivered to the downstream intermediate relay stations or egress stations. The scheduling information is used by the downstream stations to schedule the PDUs for further delivery. The scheduling information may also be used by the egress station to schedule the PDUs for delivery. The scheduling information added to the PDU by the ingress station bears on a QoS class associated with the PDU, a deadline for the egress station to deliver the PDU, or a combination thereof.Type: GrantFiled: July 14, 2008Date of Patent: August 16, 2011Assignee: Nortel Networks LimitedInventors: Hang Zhang, Peiying Zhu, Wen Tong, Gamini Senarath, Derek Yu, David G. Steer
-
FREQUENCY DIVISION DUPLEXING AND HALF DUPLEX FREQUENCY DIVISION DUPLEXING IN MULTIHOP RELAY NETWORKS
Publication number: 20110188443Abstract: In a method of operating a relay station in a multihop wireless relay network, the relay station in communication with a superordinate station and a subordinate station: a downlink transmission from the superordinate station is received at a first carrier frequency; an uplink transmission from the subordinate station is received at a second carrier frequency; a downlink transmission to the subordinate station is transmitted at the first carrier frequency; and an uplink transmission to the superordinate station is transmitted at the second carrier frequency.Type: ApplicationFiled: September 3, 2010Publication date: August 4, 2011Inventors: Israfil Bahceci, Nimal Senerath, Hang Zhang, Peiying Zhu, Derek Yu, Wen Tong -
Publication number: 20110038284Abstract: A relay station is provided for use in a wireless communication system. The wireless communication system includes a plurality of base stations communicatively coupled to a backhaul network and at least one mobile station. The relay station is shared by at least a first base station and a second base station. The relay station includes a transceiver, a controller and relay circuitry. The transceiver transmits signals to and receives signals both base stations and a mobile station. Signals transmitted to the base stations include a single preamble, MAP and FCH. The controller is electrically connected to the transceiver and is operable to measure a signal quality of the mobile station while connected to the first base station. The relay circuitry is electrically connected to the controller and is operable to conduct a phased handoff from the first base station to the second base station based on the signal quality.Type: ApplicationFiled: April 21, 2009Publication date: February 17, 2011Applicant: NORTEL NETWORKS LIMITEDInventors: Nimal Gamini Senarath, Israfil Bahceci, Mo-Han Fong, Peiying Zhu, Derek Yu, Hang Zhang, Wen Tong, Sheng Sun
-
Patent number: 7877106Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.Type: GrantFiled: May 13, 2009Date of Patent: January 25, 2011Assignee: Nortel Networks LimitedInventors: Shalini Periyalwar, Hang Zhang, Nimal Senarath, Derek Yu, Kelvin Kar-Kin Au, Karl Mann
-
Publication number: 20100248619Abstract: A mobile relay system for supporting communications between a fixed station and mobile terminals comprising a plurality of mobile relay stations that are associated with each other and provided on a moving platform, wherein each of the plurality of mobile relay stations is capable of facilitating communications with mobile terminals within communication range and at least one of the plurality of mobile relay stations is further capable of facilitating communications with a fixed station within communication range of the at least one of the plurality of mobile relay stations.Type: ApplicationFiled: January 11, 2008Publication date: September 30, 2010Applicant: NORTEL NETWORKS LIMITEDInventors: Gamini Senarath, Hang Zhang, Peiying Zhu, Wen Tong, Derek Yu, David G. Steer, Guo-Qiang Q. Wang
-
Publication number: 20090303895Abstract: A wireless communication system and method for wireless communication in a multi-hop network. A first preamble is transmitted using a first repetition cycle. Monitoring for a second preamble is done in a second repetition cycle. The first repetition cycle is different than the second repetition cycle.Type: ApplicationFiled: July 27, 2007Publication date: December 10, 2009Applicant: NORTEL NETWORKS LIMITEDInventors: Hang Zhang, Peiying Zhu, Wen Tong, Mo-Han Fong, Nimal Gamini Senarath, David Steer, Derek Yu, James Mark Naden, Israfil Bahceci
-
Publication number: 20090307484Abstract: Security in wireless communication networks that employ relay stations to facilitate communications between base stations and mobile stations is enhanced. In one embodiment, resource information provided to one or more relay stations from a base station or another relay station is encrypted prior to being delivered to the one or more relay stations. Only authorized relay stations are allocated an appropriate key necessary to decrypt the resource information. As such, only appropriate relay stations are able to access and use the resource information to effect communications directly or indirectly between the base stations and the mobile stations. In certain embodiments, the resource information is delivered between the various base and relay stations using either unicast or multicast delivery techniques.Type: ApplicationFiled: July 6, 2007Publication date: December 10, 2009Applicant: NORTEL NETWORKS LIMITEDInventors: Hang Zhang, Peiying Zhu, Mo-Han Fong, Wen Tong, Gamini Senarath, Derek Yu, David Steer
-
Publication number: 20090252065Abstract: A wireless communication system and method for a network having a tree topology. An initial path from a base station to an end relay node is selected. The path selection includes an active communication path and a redundant communication path. The path selection is based on at least one policy factor. The at least one policy factor is monitored and the path is updated based on a change to the monitored at least one policy factor.Type: ApplicationFiled: July 27, 2007Publication date: October 8, 2009Inventors: Hang Zhang, Peiying Zhu, Wen Tong, Mo-Han Fong, Nimal Gamini Senarath, David Steer, Derek Yu
-
Publication number: 20090221325Abstract: Systems and methods are provided for delivering both PMP communications, for example standard cellular communications via a base station, and also delivering P2P communications, for example, communications between two mobile stations, using the same spectral resources for both types of communication.Type: ApplicationFiled: May 13, 2009Publication date: September 3, 2009Applicant: NORTEL NETWORKS LIMITEDInventors: SHALINI PERIYALWAR, HANG ZHANG, NIMAL SENARATH, DEREK YU, KELVIN KAR-KIN AU, KARL MANN
-
Publication number: 20090185492Abstract: A method selects a path for forwarding a data packet in a wireless communication system. A system capacity versus delay impact curve is calculated for a direct path to mobile station. The direct path has a capacity cost based on communication quality of a direct link between a base station and the mobile station. This curve is shifted by a predetermined time corresponding to an additional delay over a relay path to produce a projected capacity curve for the relay path having a second capacity cost determined according to a combined measure of signal quality of multiple links in the relay path. The second capacity cost is multiplied by a capacity cost ratio to produce a relay capacity curve. The direct path or the relay path is selected based on a comparison of the system capacity versus delay impact curve and the relay capacity curve according to a QoS requirement.Type: ApplicationFiled: December 31, 2008Publication date: July 23, 2009Applicant: NORTEL NETWORKS LIMITEDInventors: Nimal Gamini SENARATH, Derek YU, Hang ZHANG, Israfil BAHCECI, Peiying ZHU, Wen TONG