Subramanian Sujani Vasudevan

US Patent:

6968186, Nov 22, 2005

Filed:

Nov 30, 2000

Appl. No.:

09/726962

Inventors:

Eshwar Pittampalli - Randolph NJ, US
Subramanian Vasudevan - Chatham NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q007/20
H04B007/00

US Classification:

4554221, 455423, 455436, 455525

Abstract:

A system and method for preventing a call from being dropped changes from a first set of serving base station(s) for the call to a second set of serving base station(s) which can be determined independently by both the wireless unit and the wireless communications system. As such, the wireless unit can attempt to recover the call using the second set of serving base station(s) even without the availability of a communication link between the wireless unit and the current set of serving base station(s). The wireless communications system can independently determine a second set of serving base station(s) for the call using information known at both the wireless communication system and at the wireless unit before the communication link was severed. For example, the wireless unit and the communications system can determine the second set of serving base station(s) using the candidate list identified with a previous pilot strength measurement message (PSMM) known to have been successfully reported to the wireless communications system. After the wireless communications system and the wireless unit determine that a call is in danger of being dropped, the wireless unit and the wireless communications system can automatically add base station(s) in the candidate set to the active set in attempting to recover the call.

US Patent:

7158504, Jan 2, 2007

Filed:

May 21, 2001

Appl. No.:

09/861967

Inventors:

Srinivas R. Kadaba - Chatham NJ, US
Farooq Ullah Khan - Manalapan NJ, US
Eshwar Pittampalli - Randolph NJ, US
Ashok N. Rudrapatna - Basking Ridge NJ, US
Ganapathy Subramanian Sundaram - Edison NJ, US
Subramanian Vasudevan - Chatham NJ, US
Yunsong Yang - Piscataway NJ, US

Assignee:

Lucent Technologies, Inc. - Murray Hill NJ

International Classification:

H04B 7/212
H04Q 7/20

US Classification:

370348, 370443, 455450, 455509

Abstract:

A multiple mode data communication system and method provides the flexibility to schedule wireless unit transmissions and/or allow the wireless unit to transmit autonomously. In certain embodiments, the wireless units can transmit autonomously and/or use scheduling depending on the data rate, the length of the data packet or the type of data. For example, the wireless units can transmit autonomously at lower data rates and use scheduling at higher data rates. Thus, the multiple mode system enables wireless unit transmissions to be scheduled and/or be transmit autonomously, and wireless units can simultaneously operate in different scheduling and/or autonomous modes. Depending on the embodiment, the system can provide even greater flexibility in operation by permitting wireless units to be scheduled by a single base station, scheduled by a multiplicity of base stations simultaneously or otherwise, via coordination between base stations, scheduled by a multiplicity of base stations in an uncoordinated and asynchronous manner, allowed to transmit autonomously, and/or allowed to transmit autonomously under base station supervision (i. e. rate control/adjustment by the base station). Additionally, a forward and/or reverse link control channel structure is provided which can be used to implement the multiple mode data communication system and/or support various features enabling increased throughput over a shared data channel in a wireless communications system.

US Patent:

7251228, Jul 31, 2007

Filed:

Mar 5, 2002

Appl. No.:

10/091674

Inventors:

Douglas N. Knisely - Wheaton IL, US
Subramanian Vasudevan - Chatham NJ, US
Yunsong Yan - Piscataway NJ, US
Wenfeng Zhang - Edison NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 7/00

US Classification:

370332, 455437, 370336, 370335

Abstract:

A method for switching cells by a mobile equipment of a communication system. The mobile transmits a signal coded with a spreading code indicating the mobile's intent to switch cells and the coded information also identifies to which cell the mobile wants to switch. The coded information contains channel measurement adjustment information that is continuously transmitted to the cell which is currently serving the mobile. The flow of channel measurement adjustment information is therefore not disturbed by the application of the method of the present invention. Because the coded information identifies the target cell and indicates the mobile's intent to perform a cell switching procedure, the amount of processing done by the cells is significantly reduced thus increasing the likelihood of a successful switching procedure.

US Patent:

7352717, Apr 1, 2008

Filed:

May 31, 2002

Appl. No.:

10/158219

Inventors:

Douglas N. Knisely - Wheaton IL, US
David Albert Rossetti - Randolph NJ, US
Subramanian Vasudevan - Morristown NJ, US
Yunsong Yang - Piscataway NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 7/00

US Classification:

370329, 370331, 370335, 455437, 455442

Abstract:

A method for performing network control in wireless communication systems and a network entity for performing the same. The method and network entity pool at least one network parameter at the network entity, from at least two active set base transceiver stations and determine a current status of a mobile in the wireless communication system, using the pooled network parameters. The active set base transceiver stations may include a serving base transceiver station and a target base transceiver station. The network parameter may be a confidence metric and/or an error metric for each of a plurality of hypotheses, a power up/power down signal, and/or a measured signal-to-noise ratio and/or energy parameter of a pilot signal from the mobile. The current status of the mobile to be determined may be the mobile's decision to switch to the target base transceiver station transceiver or which base transceiver station transceiver the mobile is currently communication with. The network entity may be a base station controller or a base transceiver station in the active set of base transceiver station transceivers for the mobile in question.

US Patent:

7385944, Jun 10, 2008

Filed:

Mar 31, 2003

Appl. No.:

10/401594

Inventors:

Hongwei Kong - Denville NJ, US
Kumud K. Sanwal - Iselin NJ, US
Subramanian Vasudevan - Morristown NJ, US
Yunsong Yang - Piscataway NJ, US
Henry Hui Ye - Ledgewood NJ, US
Jialin Zou - Randolph NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 7/00

US Classification:

370328, 370342, 370345, 370441, 370442, 455 631, 455513, 375144, 375346

Abstract:

In a method of canceling interference, a base station selects a known highest data rate user transmission from a received first signal containing a group of user transmissions. The known highest rate user transmission may be configured as one or more frames, each frame including a control preamble and a plurality of encoded sub-frames. The control preamble and encoded sub-frames may be decoded, and the decoded sub-frames may be used for removing interference caused by the known highest rate user transmission to all remaining transmissions of the group.

US Patent:

7421271, Sep 2, 2008

Filed:

Apr 12, 2004

Appl. No.:

10/822434

Inventors:

Hongwei Kong - Denville NJ, US
Subramanian Vasudevan - Morristown NJ, US
Henry Hui Ye - Ledgewood NJ, US
Jialin Zou - Randolph NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 7/20

US Classification:

455436

Abstract:

A sector switch detection method incorporates two independent, concurrent switch detection processes within a sector switch detection block. A frame-based switch detection process operates over a given single period, while a sliding window-based detection system operates over a selected multiple of periods.

US Patent:

7430241, Sep 30, 2008

Filed:

Mar 14, 2003

Appl. No.:

10/388553

Inventors:

Subramanian Vasudevan - Morristown NJ, US
Yunsong Yang - Piscataway NJ, US
Wenfeng Zhang - Edison NJ, US

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04L 27/00

US Classification:

375259, 370208, 375146, 375340, 380268, 342378

Abstract:

A system and method for transmitting and receiving control information over a control channel of a wireless communication system where the conveyed information is coded and then transformed by a set of transform function selected from a plurality of sets of transform functions. The control information is transmitted as replicated sub-frames containing replicated code words and such a string of transformed replicated code words is referred to as a control message. At a receive end inverse transform functions from different sets of functions are applied to a sub-frame of a control message so that if the sub-frame is successfully decoded the inverse transform function applied to such frame allows the timing of the control message to be determined.

US Patent:

7477899, Jan 13, 2009

Filed:

Jan 21, 2005

Appl. No.:

11/040368

Inventors:

Subramanian Vasudevan - Morristown NJ, US

Assignee:

Alcatel-Lucent USA Inc. - Murray Hill NJ

International Classification:

H04Q 7/20

US Classification:

455439, 455522

Abstract:

The present invention provides a method and an apparatus for controlling a wireless transmission in a handoff zone. The method includes receiving a schedule grant selectively from a first base station sector of a multiplicity of base station sectors in an active set of a mobile station and receiving a rate control command concurrently at the mobile station from a second base station sector of the active set that did not provide said schedule grant to determine at least one of a rate level and a power level based on a precedence given to the schedule grant over the rate control command. Using a combining rule depending upon a particular case, the mobile station may resolve a rate or a power level for a protocol in a digital cellular network of a mobile communication system. For a first case, a first combining rule combines one or more rate control commands with one or more schedule grants for a common rate control protocol, adding a grant precedence parameter, i. e. , a schedule grant from a non-serving base station sector has precedence over rate control commands from the sectors that did not send schedule grants in the active set of a mobile station.