Sundar B Subramanian

US Patent:

8462874, Jun 11, 2013

Filed:

Jul 13, 2010

Appl. No.:

12/835252

Inventors:

Sundar Subramanian - Somerville NJ, US
Aleksandar Jovicic - Jersey City NJ, US
Saurabh Tavildar - Jersey City NJ, US
Junyi Li - Chester NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 15/00

US Classification:

375285, 375295, 375316

Abstract:

The methods and apparatus described herein are used to operate a wireless device. One method of operating a wireless device includes filtering a first set of digital samples using a first filter at a first time to generate a first signal, transmitting the first signal, filtering a second set of digital samples using a second filter at a second time to generate a second signal, and transmitting the second signal. In one embodiment, an apparatus for operating a wireless device includes a processor configured to filter, at a first wireless device, a first set of digital samples using a first filter at a first time to generate a first signal, transmit, from the first wireless device, the first signal, and filter, at the first wireless device, a second set of digital samples using a second filter at a second time to generate a second signal.

US Patent:

8521208, Aug 27, 2013

Filed:

Jul 13, 2010

Appl. No.:

12/835278

Inventors:

Junyi Li - Chester NJ, US
Xinzhou Wu - Monmouth Junction NJ, US
Sundar Subramanian - Somerville NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 7/10

US Classification:

455522, 455 131

Abstract:

A method of operating a wireless device is provided in which an interference level on a resource is determined. In addition, a signal is transmitted on the resource with a first power when the interference level is low. The first power is such that the signal is received with a first SNR. Furthermore, the signal is transmitted on the resource with a second power when the interference level is high. The second power is such that the signal is received with a second SNR less than the first SNR.

US Patent:

8526317, Sep 3, 2013

Filed:

May 27, 2010

Appl. No.:

12/788487

Inventors:

Mathieu Leconte - Courbevoie, FR
Xinzhou Wu - Monmouth Junction NJ, US
Rayadurgam Srikant - Urbana IL, US
Sundar Subramanian - Somerville NJ, US
Nilesh Khude - Bridgewater NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

G01R 31/08

US Classification:

370252, 3703954

Abstract:

A method of operating a wireless device is provided in which a number of neighboring nodes is estimated, a medium access priority to access a communication resource in a current timeslot is determined, and whether to transmit a scheduling control signal in the current timeslot is determined based on the number of neighboring nodes and the medium access priority.

US Patent:

8600411, Dec 3, 2013

Filed:

Aug 8, 2012

Appl. No.:

13/570109

Inventors:

Sundar Subramanian - Bridgewater NJ, US
Xinzhou Wu - Hillsborough NJ, US
Junyi Li - Chester NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04W 24/00

US Classification:

4554563

Abstract:

Safety message monitoring operations and/or safety message transmission operations are controlled for a mobile wireless communications device. The periodicity with regard to safety message monitoring and/or safety message transmissions is varied based on the environment of the mobile wireless device. The transmission power level with regard to safety message transmissions is varied based on the environment of the mobile wireless device. In some embodiments, safety message monitoring and transmission operations are disabled when the mobile device is determined to be inside a building or inside a vehicle. In some embodiments, safety message monitoring rate and safety message transmission rate is varied as a function of proximity to vehicular traffic and/or the level of detected vehicular traffic. In some embodiments, safety message transmission power level is varied as a function of proximity to vehicular traffic and/or the level of detected vehicular traffic.

US Patent:

8630307, Jan 14, 2014

Filed:

Sep 13, 2011

Appl. No.:

13/231417

Inventors:

Xinzhou Wu - Monmouth Junction NJ, US
Thomas J. Richardson - South Orange NJ, US
Junyi Li - Chester NJ, US
Sundar Subramanian - Somerville NJ, US
Nilesh Khude - Bridgewater NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 12/413
G01R 31/08
G06F 11/00
G08C 15/00
H04J 1/16
H04J 3/14
H04L 1/00
H04L 12/26

US Classification:

370447, 370449, 370461, 370462, 370235

Abstract:

Methods and apparatus for allocating traffic contention resource units in a wireless communications system in which decisions are made in a distributed manner are described. A wireless communications device, corresponding to a link, self allocates resource units for traffic contention. Decisions regarding initially acquiring resources, relinquishing acquired resources, and/or acquiring additional resources for traffic contention are based on detected levels of network congestion and/or detected changes in network congestion. A wireless communications device detects a level of network congestion and determines a number of resource units to acquire for traffic contention based on the detected level of network congestion.

US Patent:

20110205887, Aug 25, 2011

Filed:

Feb 25, 2010

Appl. No.:

12/712629

Inventors:

Xinzhou Wu - Monmouth Junction NJ, US
Junyi Li - Chester NJ, US
Nilesh Khude - Bridgewater NJ, US
Sundar Subramanian - Somerville NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 7/00
H04L 12/56

US Classification:

370229, 455522

Abstract:

A wireless communications device supports a constant transmission power mode of operation and a time varying transmission power mode of operation for transmitting data, e.g., peer discovery data. The device determines an amount of network congestion and switches between the two modes of operation as a function of the determined amount of network congestion. Various described methods and apparatus are well suited for use in a peer to peer ad hoc wireless communications system in which a limited amount of air link resources are available for peer discovery signaling and the same peer discovery resources are, at times, used concurrently by multiple devices. When network congestion is low, the device operates in the constant transmission power mode. When network congestion is high, the device operates in the time varying power mode. Devices sharing a common peer discovery resource in a local area intentionally select different time varying transmission patterns.

US Patent:

20120008571, Jan 12, 2012

Filed:

Jul 8, 2010

Appl. No.:

12/832808

Inventors:

Junyi Li - Chester NJ, US
Xinzhou Wu - Monmouth Junction NJ, US
Sundar Subramanian - Somerville NJ, US
Nilesh Khude - Bridgewater NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04W 72/12

US Classification:

370329

Abstract:

A method of operating a wireless device includes selecting a connection identifier with a first node, receiving a scheduling control signal on a resource associated with the connection identifier, and determining a presence of a second node transmitting on the same resource associated with the connection identifier based on the received scheduling control signal.

US Patent:

20120014463, Jan 19, 2012

Filed:

Jul 13, 2010

Appl. No.:

12/835264

Inventors:

Xinzhou Wu - Monmouth Junction NJ, US
Sundar Subramanian - Somerville NJ, US
Junyi Li - Chester NJ, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 27/28
H04L 27/00

US Classification:

375260, 375295

Abstract:

Methods and apparatus for determining, e.g., selecting, communications resources, e.g., tones, to use in a communications system are described. The methods are well suited for use in Orthogonal Frequency Division Multiplexing (OFDM) systems. Devices seeking to transmit information select tones in pairs for use in transmitting the information. Each tone pair includes a tone and the corresponding image tone. By restricting a communications device to select communications frequencies in pairs, the problem of interference and reduced dynamic range at a receiver due to IQ imbalance is reduced, as compared to the case where devices may use a tone independent of the corresponding image tone for transmission purposes, since the path loss from the transmitter to the receiver is likely to be the same for both tones and the transmission power level is controlled by an individual device using both of the tones.