Hong Xiang Jiang

US Patent:

6445752, Sep 3, 2002

Filed:

Feb 12, 1999

Appl. No.:

09/248904

Inventors:

Hong Jiang - Montclair NJ
Paul L. Palmieri - New Providence NJ
Agesino Primatic, Jr. - Frenchtown NJ
Lesley J. Wu - Parsippany NJ
Liangkai Yu - New Providence NJ

Assignee:

Agere Systems Guardian Corp. - Miami Lakes FL

International Classification:

H04L 2714

US Classification:

375326, 375235

Abstract:

A phase tracker receives a signal component x and forms a phase- and gain-corrected signal z. In particular, the phase tracker performs a Hilbert transform of x to produce a quadrature phase component y to form the constellation defined by (x , y ). Consequently, phase rotation and gain adjustment are combined into a linear transform of the constellation defined by (x , y ). The linear transform z =x +y employs two coefficients and. The coefficients and of the linear transform are derived so as to provide an optimal solution according to minimum mean square error. Approximations to the coefficients and of the linear transform may be iteratively determined with a stochastic gradient method. Advantages of employing the phase- and gain-corrected signal z as an I-phase detection result of a demodulator include 1) the phase rotation and gain adjustment are combined into one operation, and 2) the a sine/cosine lookup table is not employed. Including both phase rotation and a gain adjustment may provide for better performance of the demodulator.

US Patent:

6690659, Feb 10, 2004

Filed:

Jan 10, 2000

Appl. No.:

09/480025

Inventors:

Walid Ahmed - Eatontown NJ
Bharat Tarachand Doshi - Holmdel NJ
Hong Jiang - Westfield NJ
Pantelis Monogioudis - Edison NJ
Kiran M. Rege - Marlboro NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 700

US Classification:

370328, 370352, 455432

Abstract:

In an IP addressing aspect of the invention, a method for use in an Internet Protocol (IP) based communications system, comprises the steps of: (i) assigning a temporary location IP address (e. g. , LIPA) to a mobile user station in the communications system, the address being a combination of an identifier of the mobile user station (e. g. , MID) and an identifier of a network node in the communications system with which the mobile user station is currently associated (e. g. , RID); and transferring packets to and from the mobile user station in accordance with the temporary location IP address. The method may further comprise the step of changing the temporary location IP address assigned to the mobile user station when the station becomes associated with another network node of the communications system, the changed address being a combination of the identifier of the mobile user station and an identifier of the new network node. The method may further comprise the step of assigning a location IP address to a network node in the communications system, the address being a combination of an identifier of the network node and a common identifier of mobile user stations in the communications system.

US Patent:

6735202, May 11, 2004

Filed:

Jan 10, 2000

Appl. No.:

09/480022

Inventors:

Walid Ahmed - Eatontown NJ
Bharat Tarachand Doshi - Holmdel NJ
Hong Jiang - Westfield NJ
Pantelis Monogioudis - Edison NJ
Kiran M. Rege - Marlboro NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 1228

US Classification:

370392, 370394, 370401

Abstract:

In a mobility management aspect of the invention, several unique mobility management control messages are defined for use in performing various mobility management functions in the communications system with respect to the mobile user stations and network nodes. These messages may comprise: (i) a Location Update Message (LUM); (ii) a Location Confirm Message (LCM); (iii) a Location Query Message (LQM); (vi) a Location Reply Message (LRM); (v) a Registration Message (RM); and (vi) a Registration Reply Message. One or more of these messages are used in the IP-based system to perform mobility management functions such as location management, mobile access and in-call mobility management.

US Patent:

6747961, Jun 8, 2004

Filed:

Apr 11, 2000

Appl. No.:

09/547262

Inventors:

Walid Ahmed - Eatontown NJ
Bharat Tarachand Doshi - Holmdel NJ
Subrahmanyam Dravida - Groton MA
Hong Jiang - Westfield NJ
Kiran M. Rege - Marlboro NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 700

US Classification:

370328, 370393, 370400, 370469, 455433, 455456

Abstract:

Various methodologies and related apparatus associated with mobility management issues within a packet-based multiaccess mobile communications system, which includes a plurality of mobile user stations and a plurality of network nodes, are provided. Location management techniques include tracking and/or locating mobile stations within the system. The invention makes use of home and visiting location registers in which information such as mobile station addresses and/or host names associated with mobile stations are stored. Mobile access methodologies include a complete mobile access method and a direct mobile access method. The former allows a mobile station to preferably include a unique address in the packets being transmitted, while the latter allows the station to merely use the host name of the destination station. The invention also includes various in-call mobility management techniques, including handoffs, which make use of the concept of an anchor.

US Patent:

6765896, Jul 20, 2004

Filed:

Jan 10, 2000

Appl. No.:

09/480763

Inventors:

Walid Ahmed - Eatontown NJ
Bharat Tarachand Doshi - Holmdel NJ
Hong Jiang - Westfield NJ
Pantelis Monogioudis - Edison NJ
Kiran M. Rege - Marlboro NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 724

US Classification:

370338, 370352, 370392

Abstract:

In an IP addressing aspect of the invention, a method for use in facilitating transfer of packets in an Internet Protocol (IP) based communications system, wherein the communications system includes a plurality of network nodes and a plurality of mobile user stations, comprises the steps of: (i) inserting an address option field in a packet header of a packet to be transferred in the communications system, the address option field including supplemental address related data for facilitating transfer of packets in the communications system; and processing the packet within at least one of a network node and a mobile user station in the communications system in accordance with the supplemental address related data in the address option field of the packet header. The address option field may comprise an address type field, an address length field and an address data field. Various address related data may be included in the address data field to facilitate transfer of packets in an IP-based communications system.

US Patent:

6816460, Nov 9, 2004

Filed:

Mar 14, 2000

Appl. No.:

09/525735

Inventors:

Walid Ahmed - Eatontown NJ
Hong Jiang - Westfield NJ
Muralidharan Sampath Kodialam - Marlboro NJ
Pantelis Monogioudis - Edison NJ
Kiran M Rege - Marlboro NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 1226

US Classification:

370238, 370255

Abstract:

In an ad-hoc mobile network, a geometry-based routing algorithm (GRA) is used to route traffic from a source node to a destination node. In the GRA, a source node maintains location information and routing information for all nodes in a local area and approximate location information for at least some nodes outside the local area. If the source node has to send a packet to a destination node outside their local area, then the source node uses the approximate location information of the destination node to identify which node in its local area is closer to the destination node than the source node. The source node then sends the packet to the identified local node for further routing.

US Patent:

6947398, Sep 20, 2005

Filed:

Nov 13, 1998

Appl. No.:

09/191132

Inventors:

Walid Ahmed - Eatontown NJ, US
Bharat Tarachand Doshi - Holmdel NJ, US
Subrahmanyam Dravida - Groton MA, US
Hong Jiang - Westfield NJ, US
Kiran M. Rege - Marlboro NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q007/00

US Classification:

370331, 370328, 370389, 370392, 37039554, 370400, 370475

Abstract:

An addressing scheme for a packet-based multiaccess mobile communications system, which includes a plurality of mobile user stations and a plurality of network nodes, is provided. In such addressing scheme, each mobile station is assigned an address which is a combination (preferably, a concatenation) of a unique identifier of a network node with which the mobile station is currently associated and an identifier of the mobile station. The network node identifiers may be uniquely assigned by a network administrator, while the identifiers of the mobile stations may, for example, be set to a universal MAC address assigned to the station. The address may also include a port identifier which indicates the particular application flow associated with the accompanying packets. Similarly, each network node is assigned an address which is a combination (preferably, a concatenation) of its network node identifier and, preferably, an interface identifier. The address may also include a port identifier.

US Patent:

7006453, Feb 28, 2006

Filed:

Mar 14, 2000

Appl. No.:

09/525090

Inventors:

Walid Ahmed - Eatontown NJ, US
Hong Jiang - Westfield NJ, US
Muralidharan Sampath Kodialam - Marlboro NJ, US
Pantelis Monogioudis - Edison NJ, US
Kiran M Rege - Marlboro NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 12/28

US Classification:

370255, 370389

Abstract:

In an ad-hoc mobile network, a geometry-based routing protocol (GRP) is used to route traffic from a source node to a destination node. In the GRP, each node maintains a location list, which comprises location information for a number of nodes of the ad-hoc mobile network. Periodically, each node transmits to its direct neighbors (i. e. , those nodes with which it has a point-to-point link) (a) its location, and (b) its location list. Each node that receives a location list from an adjacent node merges the received location list into its own location list such that location information for existing nodes, and/or newly identified nodes, is current.