David P Julian

US Patent:

8005065, Aug 23, 2011

Filed:

Sep 11, 2007

Appl. No.:

11/853668

Inventors:

Zhanfeng Jia - Belmont CA, US
David Jonathan Julian - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04J 3/06

US Classification:

370350

Abstract:

A transmitting device transmits data to one or more receiving devices. At least one of the receiving devices transmits a keep-alive to the transmitting device. The keep-alive is transmitted at a reduced rate relative to the data transmission rate. In some implementations multiple receiving devices may transmit keep-alives. In these cases, each receiving device may transmit its keep-alives according to a schedule to prevent or reduce the likelihood of overlapping keep-alives. In some implementations a receiving device may be selected to transmit keep-alives. Here, if the selected receiving device stops transmitting keep-alives another receiving device is selected to transmit keep-alives. Through the use of the above techniques, the transmitting device need not keep track of which receiving devices are listening to the data transmission. Rather, the transmitting device may simply stop transmitting in the event that it no longer receives keep-alives.

US Patent:

8165080, Apr 24, 2012

Filed:

Jan 16, 2009

Appl. No.:

12/355008

Inventors:

Zhanfeng Jia - Belmont CA, US
David Jonathan Julian - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04W 72/04

US Classification:

370329, 370349, 455450

Abstract:

In an addressing scheme for wireless communication a communication channel may be defined based on a unique identifier associated with a destination node or a source node. In addition, a short identifier may be included in messages sent over the communication channel such that a node may uniquely identify the source node or destination node for the message. A node may use a short identifier as an index into a lookup table to determine one or more parameters to be used for communicating with another node.

US Patent:

8290069, Oct 16, 2012

Filed:

Oct 7, 2008

Appl. No.:

12/246998

Inventors:

Zhanfeng Jia - Belmont CA, US
David Jonathan Julian - San Diego CA, US
Qingjiang Tian - San Diego CA, US
James W. Dolter - San Diego CA, US
Vito R. Bica - Poway CA, US
Harinath Garudadri - San Diego CA, US
Chinnappa K. Ganapathy - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04K 1/10
H04B 7/02

US Classification:

375260, 375267

Abstract:

A system and method for media access control are disclosed. The method comprises providing concurrent orthogonal channels to access media using pulse division multiple access to define pulse positions, wherein the pulse division multiple access includes a time hopping sequence and an offset to distinguish the concurrent orthogonal channels. In addition, the method comprises processing signals associated with at least one of the orthogonal channels.

US Patent:

8306032, Nov 6, 2012

Filed:

Mar 9, 2010

Appl. No.:

12/720415

Inventors:

Zhanfeng Jia - Belmont CA, US
Qingjiang Tian - San Diego CA, US
David Jonathan Julian - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 12/56

US Classification:

370394, 370231

Abstract:

A communications method comprising the steps of receiving a data packet; processing the data packet; and transmitting an ack packet approximately at an end of a first defined time interval if the processing of the data packet is completed within the first defined interval, or transmitting the ack packet approximately at an end of a second defined time interval if the processing of the data packet is not completed within the first defined interval and is completed within the second defined interval. Another communication method comprising the steps of transmitting a data packet; scanning a channel for an ack packet approximately at an end of a first defined time interval from the transmission of the data packet; and scanning the channel for the ack packet approximately at an end of a second defined time interval from the transmission of the data packet if the ack packet was not received within the first defined interval.

US Patent:

8363583, Jan 29, 2013

Filed:

Dec 15, 2006

Appl. No.:

11/611338

Inventors:

Zhanfeng Jia - Belmont CA, US
Amal Ekbal - San Diego CA, US
David Jonathan Julian - San Diego CA, US
Fatih Ulupinar - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04H 20/71
H04J 9/00
H04J 3/16

US Classification:

370312, 370465

Abstract:

A channel access scheme is provided for a pulse-based ultra-wide band network. Here, concurrent ultra-wide band channels may be established through the use of a pulse division multiple access scheme. An access scheme may employ different states each of which may be associated with different channel parameter state information and/or different duty cycles. For example, a channel access scheme may employ an inactive state, an idle state, a connected state, and a streaming state. Multiple logical channels may be defined for a given ultra-wide band channel via, for example, pulse division multiplexing.

US Patent:

8553744, Oct 8, 2013

Filed:

Jan 6, 2009

Appl. No.:

12/349430

Inventors:

Zhanfeng Jia - Belmont CA, US
David Jonathan Julian - San Diego CA, US
Amal Ekbal - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04B 1/00

US Classification:

375132, 375130

Abstract:

An apparatus for communications configured to support first and second spread-spectrum channels, each of the first and second channels being based on a different pseudorandom sequence. The apparatus further configured to select one of the first and second channels for communications to avoid a collision of information that would otherwise occur based on their pseudorandom sequences.

US Patent:

8582539, Nov 12, 2013

Filed:

Nov 24, 2008

Appl. No.:

12/277072

Inventors:

Zhanfeng Jia - Belmont CA, US
David Jonathan Julian - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04J 3/00

US Classification:

370336, 370345

Abstract:

A system and method to implement synchronous channel timing are disclosed. The method comprises establishing a session time interval. In addition, the method comprises establishing a first time interval within the session time interval for transmitting a first data packet.

US Patent:

20070248114, Oct 25, 2007

Filed:

Jan 4, 2007

Appl. No.:

11/620021

Inventors:

Zhanfeng Jia - Belmont CA, US
Chong U. Lee - San Diego CA, US
David Jonathan Julian - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04J 4/00

US Classification:

370465

Abstract:

Media access control is provided for an ultra-wide band medium. The media access control may employ a peer-to-peer network topology. The media access control may employ a reduced addressing scheme. Concurrent ultra-wide band channels may be established through the use of a pulse division multiple access channelization scheme. Multiple media access control states may be defined whereby each state may be associated with one or more of different channel parameter state information, different duty cycles, and different synchronization status.