Shankar Suchitru Narayanaswamy

US Patent:

6490270, Dec 3, 2002

Filed:

Jul 27, 1999

Appl. No.:

09/361430

Inventors:

Rajeev Krishnamoorthy - Middletown NJ
Xiaodong Li - Piscataway NJ
Shankar Narayanaswamy - Sunnyvale CA
Markus Rupp - Lincroft NJ
Harish Viswanathan - Matawan NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 138

US Classification:

370347, 370337, 375261

Abstract:

In a wireless communication system, the constellation mapping scheme employed may be changed on a per-time-slot basis, i. e. , from time slot to time slot, so that the constellation used to encode the symbols of each time slot may be different for each time slot within a single frame and may be different for a particular time slot in different consecutive frames. In other words, several constellation mapping schemes are available, with each providing the ability to transmit a different number of bits per symbol, and the particular constellation mapping scheme employed for any time slot need be selected for that time slot only. The ability to use any particular constellation mapping scheme is dependent on the current channel quality. The particular constellation mapping used for the user data of the time slot may be indicated in the preamble of the time slot. To this end, each time slot may have its own preamble that is mapped with a constellation mapping scheme which is a) known a priori, b) may be the same for all time slots, and c) may be different from the constellation mapping scheme used to encode user data in the time slot.

US Patent:

6611358, Aug 26, 2003

Filed:

Jun 17, 1997

Appl. No.:

08/877454

Inventors:

Shankar Narayanaswamy - Sunnyvale CA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04N 100

US Classification:

358442, 358443, 37910013, 345864

Abstract:

A system and method for transcoding a document to be transmitted to a mobile station according to document display capabilities thereof and a wireless infrastructure containing the same. The system includes: (1) a station identifying circuit that receives data indicating a particular mobile stations document display capabilities and (2) a transcoding circuit that modifies the document according to the document display capabilities before the document is transmitted to the particular mobile station, the particular mobile station thereby freed of having locally to substantially modify the document according to the document display capabilities.

US Patent:

6625165, Sep 23, 2003

Filed:

Jul 27, 1999

Appl. No.:

09/361861

Inventors:

Rajeev Krishnamoorthy - Middletown NJ
Shankar Narayanaswamy - Sunnyvale CA
Markus Rupp - Lincroft NJ
Harish Viswanathan - Matawan NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04J 316

US Classification:

370465, 370474

Abstract:

A two layered segmentation technique coupled with a two layer error detection technique is used to implement the wired to wireless network interface. A wireless network divides network layer packets from a wired network into radio data link packets, and the information within the radio data link packets is divided into portions that can be placed into time slots. Error detection is performed on each of the time slots and also at the radio data link packet level to determine if there is an error within the radio data link packet. Errors detected in any radio data link packet only requires retransmission of the radio data link packet in which the error was detected, and, advantageously, do not require retransmission of the entire network layer packet as would have been required in a system that mapped directly from network layer packets to time slots. Further advantageously, the system is able to be employed by systems that utilize dynamic constellation mapping schemes which result in different time slots for the same user being mapped with different constellations, and so they have different bit to symbol ratios. This is because such changes in the constellation mapping scheme are handled at the time slot level, and are not seen at the radio data link packet level.

US Patent:

6636500, Oct 21, 2003

Filed:

Jul 27, 1999

Appl. No.:

09/362002

Inventors:

Rajeev Krishnamoorthy - Middletown NJ
Shankar Narayanaswamy - Sunnyvale CA
Markus Rupp - Lincroft NJ
Harish Viswanathan - Matawan NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 7222

US Classification:

370347, 370468

Abstract:

In a system in which the modulation scheme employed may change on a per-time-slot basis, a users available data rate may change even if the user maintains the same number of time slots, because the capacity of the users time slots may change. If one or more such changes in modulation scheme occurs, the data rate available to the user may no longer match his current data rate needs. Therefore, a method is disclosed for determining the number of time slots to assign to a user as a function of the users current data rate requirement and the actual current cumulative data rate of the time slots currently assigned to the user. The user data rate requirement may further be a function of a quality of service (QoS) contracted for by the user. Thus, the assignment of the time slots within the frame is made dynamically and the number of time slots employed by a user is increased or decreased according to the users current data rate requirements and the ability of the time slots already assigned to the user to meet those requirements.

US Patent:

6782037, Aug 24, 2004

Filed:

Jul 27, 1999

Appl. No.:

09/361317

Inventors:

Rajeev Krishnamoorthy - Middletown NJ
Xiaodong Li - Piscataway NJ
Shankar Narayanaswamy - Sunnyvale CA
Markus Rupp - Lincroft NJ
Harish Viswanathan - Matawan NJ

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04B 169

US Classification:

375138

Abstract:

In a wireless communication system, the constellation mapping scheme employed may be changed on a per-time-slot basis, i. e. , from time slot to time slot, so that the constellation used to encode the symbols of each time slot may be different for each time slot within a single frame and may be different for a particular time slot in different consecutive frames. In other words, several constellation mapping schemes are available, with each providing the ability to transmit a different number of bits per symbol, and the particular constellation mapping scheme employed for any time slot need be selected for that time slot only. The ability to use any particular constellation mapping scheme is dependent on the current channel quality. The particular constellation mapping used for the user data of the time slot may be indicated in the preamble of the time slot. To this end, each time slot may have its own preamble that is mapped with a constellation mapping scheme which is a) known à priori, b) may be the same for all time slots, and c) may be different from the constellation mapping scheme used to encode user data in the time slot.

US Patent:

RE40821, Jul 7, 2009

Filed:

Nov 6, 2002

Appl. No.:

10/289082

Inventors:

Shankar Narayanaswamy - Sunnyvale CA, US
Eugene J. Rosenthal - Edison NJ, US

Assignee:

Alcatel-Lucent USA Inc. - Murray Hill NJ

International Classification:

G09G 3/36

US Classification:

345102, 345173, 345 5, 349 61

Abstract:

A portable or other electronic device has two or more display devices or screens that can be used to display different subsets of image signals. The effect is that the device simulates the display capabilities of devices having much larger screens. The device has an open or active configuration, in which the multiple screens are available for displaying image signals, and a closed or inactive configuration, in which some or all of the multiple screens are folded together or otherwise stowed away to reduce the size of the device for storage and/or carrying. By simulating large-display operations, electronic devices according to the present invention are capable of presenting more useable information to the user than is otherwise possible using prior art devices having a single small screen.

US Patent:

61674117, Dec 26, 2000

Filed:

Jun 22, 1998

Appl. No.:

9/102195

Inventors:

Shankar Narayanaswamy - Sunnyvale CA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

G06K 900
G06F 1721

US Classification:

707541

Abstract:

An automatically advancing user interface for entering new data and editing pre-existing data in data entry fields on a display screen. Data is entered and/or edited in a universal handwriting capture widget. A plurality of text entry widgets corresponding to the different data entry fields are displayed on the screen. The user defines a sequentially ordered list of text entry widgets. At any given time only one text entry widget is selected as the current text entry widget based on the sequentially ordered list. The data in the current text entry widget is displayed in the handwriting capture widget. After the data has been entered and/or edited in the handwriting capture widget it is displayed in the current text entry widget. The current text entry widget is then automatically advanced by selecting as the current text entry widget the next text entry widget in the sequentially ordered list of text entry widgets.

US Patent:

62954571, Sep 25, 2001

Filed:

Jun 27, 1997

Appl. No.:

8/884436

Inventors:

Shankar Narayanaswamy - Santa Clara CA

Assignee:

Lucent Technologies Inc. - Murray Hill NJ

International Classification:

H04Q 720

US Classification:

455466

Abstract:

A system for directly connecting a mobile communication system to a data network is provided. A user initiates data communication with the data network from a mobile communication system equipped with a computer, a modem and a mobile communication device. Data communication signals, which may be designated for routing to the data network, are transmitted from the mobile communication device to a hybrid base station having a standard base station, a control unit and a data network gateway, via a wireless telecommunication network. The signals are received by the hybrid base station and routed to the control unit which determines whether the received data communication signals are of the type designated for routing to the data network. If the data communication signals are of the type so designated, the control unit routes the signals to the data network gateway, which then connects the mobile communication system to the data network, enabling a direct data communication connection therebetween via the wireless data communication network. Otherwise, the data communication signals are routed to another destination, such as to another base station or to the PSTN.