Ratul Kumar Guha

8169897, May 1, 2012

Sep 21, 2009

12/563420

Ratul K. Guha - Kendall Park NJ, US
Wai Chen - Parsippany NJ, US
Stephanie Demers - Westfield NJ, US

Telcordia Technologies, Inc. - Piscataway NJ

H04J 1/16

370229, 370237

A method for high rate data delivery in a multi-hop vehicular network comprises at each source vehicle, initiating a packet having a flow tag, assigning an identifier of the content and the current location to the flow tag, and forwarding the packet; at each destination vehicle, setting a flow request and broadcasting at the current intersection; further on movement, setting the flow request at the new intersection, and at each intersection, selecting a header vehicle at the intersection, computing backlog and congestion indicators and listening for broadcasts with a matrix and the flow requests at the header vehicle, determining if the matrix is present, updating the matrix in accordance with the backlog and congestion indicators if the matrix is present, initializing the matrix and estimating the delay on the outgoing road segments if the matrix is not present, forwarding the packet flow, and broadcasting the matrix from the header vehicle.

8199683, Jun 12, 2012

Feb 4, 2010

12/700123

Ratul K. Guha - Kendall Park NJ, US
Wai Chen - Parsippany NJ, US

Telcordia Technologies, Inc. - Piscataway NJ

H04B 7/005

370278, 370276, 455 39, 455 412, 455 91, 4551151, 455121

A system for fall-duplex communication using a single transmitter is presented. The system comprises a base station with a signal and data processor, peripheral detectors each placed at a distance from the transmitting antenna, and a mobile device having at least a dipole antenna having a switch and a loop antenna having a switch, wherein the sending device modulates the shorting state, i. e. , the electromagnetic configuration, of the wire and coil antennas using the switches, the modulating resulting in alteration in load at the base station. This alteration can be calculated based on input from the transmitting antenna and the detectors, each input having time coding. The input from the transmitting antenna can be magnitude of propagated signal and the input from each detector can comprise a quantified signal level and the quantified signal level time-delayed by propagation time. The detectors can be peripheral signal level detecting antennas.

8570994, Oct 29, 2013

Oct 19, 2011

13/276375

Wai Chen - Basking Ridge NJ, US
John Lee - Howell NJ, US
Ratul K. Guha - Kendall Park NJ, US
Ryokichi Onishi - Jersey City NJ, US
Rama Vuyyuru - Somerset NJ, US

Telcordia Technologies, Inc. - Piscataway NJ
Toyota Infotechnology Center, U.S.A., Inc. - Palo Alto CA

H04W 4/00

370338

The present invention offers systems and methods for effective multiple-hop routing, multicasting and media access control for vehicle group communications that employ directional wireless radio technology. Multi-beam optic-wireless media and streamlined operations provide low-overhead communications among vehicles. Systems and methods are provided to maintain a quasi-stationary group of neighboring vehicles, enable high-throughput on-demand switching among multiple vehicles, enable group coding in the vehicle group to achieve higher throughput, and enable dynamic adjustment of link to maintain desirable vehicle group. The proposed solution builds upon the conception of a MAC-free wireless operation and quasi-stationary vehicular switched network to achieve ultra-low-overhead and high-throughput vehicle communications.

8589073, Nov 19, 2013

Dec 23, 2009

12/646277

Ratul K. Guha - Kendall Park NJ, US
Wai Chen - Parsippany NJ, US

Telcordia Technologies, Inc. - Piscataway NJ

G08G 1/09
G01C 21/00
G01C 21/36
G01G 19/00

701527, 701117, 701118, 701414, 701416, 701420, 701422, 701423, 701437, 701537, 340905

A method for distributed traffic navigation in a vehicular network is presented. At each vehicle entering the network, information associated with the vehicular network is acquired and stored, and destination addresses are broadcasted as route requests. At each vehicle in the network, the stored information is updated through vehicle to vehicle communication. At each junction, a header vehicle is selected for listening for broadcasts to determine the presence of a matrix. If the matrix is not present, the matrix is initialized based on the stored information of the header vehicle. The header vehicle further estimates travel time on the road segments based on the matrix, calculates a backlog indicator based on the segment travel time and the route requests. The header vehicle further updates the matrix and generates a route based on the matrix. The matrix is broadcasted from the header vehicle.

20090238187, Sep 24, 2009

Mar 20, 2009

12/408221

Ratul K. Guha - Princeton NJ, US
Wai Chen - Parsippany NJ, US
Stephanie Demers - Westfield NJ, US

TELCORDIA TECHNOLOGIES, INC. - Piscataway NJ

H04L 12/56

370392, 370465

An inventive method for data delivery in a multi-hop vehicular network with multiple vehicles and intersections is presented. The method comprises, at each source vehicle, initiating packet flow, labeling packets with destination coordinates and a current location, and forwarding the packet flow, and at each intersection, selecting a header vehicle, computing a backlog indicator and listening for broadcasts with a matrix and delay information, updating the matrix in accordance with the backlog indicator if the matrix is present, otherwise initializing the matrix, forwarding the packet flow, and broadcasting the matrix from the header vehicle. In one embodiment, selection of the header vehicle is performed based on random countdown and vehicle ID. The method converges to the optimal (lowest latency) state irrespective of the initial starting point of the network and continues to tend towards the optimal state even as the network conditions alter.

20090310608, Dec 17, 2009

Jul 23, 2008

12/178338

Wai Chen - Parsippany NJ, US
John Lee - Howell NJ, US
Ratul K. Guha - Princeton NJ, US
Ryokichi Onishi - Jersey City NJ, US
Rama Vuyyuru - Somerset NJ, US

TELCORDIA TECHNOLOGIES, INC. - Piscataway NJ
TOYOTA INFOTECHNOLOGY CENTER U.S.A., INC. - Palo Alto CA

H04L 12/56

370389

The present invention offers systems and methods for effective multiple-hop routing, multicasting and media access control for vehicle group communications that employ directional wireless radio technology. Multi-beam optic-wireless media and streamlined operations provide low-overhead communications among vehicles. Systems and methods are provided to maintain a quasi-stationary group of neighboring vehicles, enable high-throughput on-demand switching among multiple vehicles, enable group coding in the vehicle group to achieve higher throughput, and enable dynamic adjustment of link to maintain desirable vehicle group. The proposed solution builds upon the conception of a MAC-free wireless operation and quasi-stationary vehicular switched network to achieve ultra-low-overhead and high-throughput vehicle communications.

20110227757, Sep 22, 2011

Mar 16, 2010

12/724623

Wai Chen - Basking Ridge NJ, US
Ratul K. Guha - Kendall Park NJ, US
John Lee - Howell NJ, US
Ryokichi Onishi - Kanagawa, JP
Rama Vuyyuru - Somerset NJ, US

TELCORDIA TECHNOLOGIES, INC. - Piscataway NJ
TOYOTA INFOTECHNOLOGY CENTER, U.S.A., INC. - Mountain View CA

H04B 7/00
G08G 1/00

340902, 370310

A method and apparatus for optimizing communication of data within a disruption tolerant network. The method comprises of receiving a data packet, said data packet including a context and a state related to said context, storing the data packet to a buffer and disseminating the data packet to neighboring vehicles and RSU, and passing said state to an application, said application associated with said application context. In one embodiment, the method functions as a software protocol within a dashboard computer. The apparatus comprises a processor and a memory operable to receive a data packet, said data packet including a context and a state related to said context, store the data packet to a buffer when the context matches an application context, disseminating the data packet to neighboring vehicles and RSU, and pass said state to an application when the context matches an application context, said application associated with said application context. In one embodiment, the apparatus is presented as a dashboard computer within a vehicle.

20110250836, Oct 13, 2011

Apr 9, 2010

12/757078

Ratul K. Guha - Kendall Park NJ, US
Wai Chen - Basking Ridge NJ, US

Telcordia Technologies, Inc. - Piscataway NJ

H04B 7/24

455 39

A system and method for increasing transmission concurrency amongst communicating vehicles using UWB radio-based communication is presented. The method comprises dividing an area around a sending vehicle into transmission areas, and, for each transmission area, broadcasting a message from the sending vehicle, waiting for a time, and when a not clear to send response is not received, sending information to the transmission area, and the information being sent using a time-hopping sequence based on a location and seed in the message. The message can also have a frame length and a target region. The method can also comprise determining, when a no-send is received, whether the no-send was in response to the message from the sending vehicle, and when the no-send is not in response to the message from the sending vehicle, sending the information to the transmission area. The system and method can be used for active-safety vehicle communication.