Matthew A Fischer

US Patent:

6747996, Jun 8, 2004

Filed:

Dec 7, 2000

Appl. No.:

09/732213

Inventors:

John T. Holloway - Atherton CA
Matthew James Fischer - Mountain View CA
Jason Alexander Trachewsky - Palo Alto CA

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04J 306

US Classification:

370503, 370516

Abstract:

A method of providing for synchronizing one or more synchronous terminals with one or more synchronous endpoints, each synchronous terminal and each synchronous endpoint having an asynchronous communications network coupled between at least one synchronous terminal and at least one synchronous endpoint. A synchronization protocol is established between a synchronous terminal and a synchronous end point by providing a gateway between the asynchronous communications network and the synchronous end point, the gateway communicating with the synchronous terminal over the asynchronous communications network in accordance with the synchronization protocol. The synchronization protocol includes sending a message from the gateway to the synchronous terminal, the message containing a timestamp identifying a clock associated with the synchronous end point. The synchronous terminal establishes a clock associated with the synchronous terminal by creating a clock estimate based upon the timestamp message and access jitter expected from the asynchronous communications network such that the clock associated with the synchronous terminal enables packet sampling and transmission onto the asynchronous communications network to and from the synchronous terminal to be synchronized with the clock associated with the synchronous end point.

US Patent:

6877043, Apr 5, 2005

Filed:

Apr 4, 2001

Appl. No.:

09/825689

Inventors:

Tracy D. Mallory - Palo Alto CA, US
Matthew James Fischer - Mountain View CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G06F015/16

US Classification:

709251, 709252, 709253

Abstract:

A method for distributing sets of collision resolution parameters to be used for resolution of network access contention events among nodes of a non-centralized media access control shared medium network. A set of collision resolution parameters is provided which includes a sequence of fixed numbers for resolving a single network access contention event. A single collision signal slot master node is identified when one or more candidate collision signal slot master nodes exist. Collision signal slot request messages are sent from client nodes addressed to all network nodes. Collision signal slot assignment messages are sent from the master node to the client nodes. A collision resolution parameter set to be employed by that given client node is obtained at a given client node from within a received collision signal slot assignment message. Collision signal slot acknowledgment messages are sent from client nodes addressed to all network nodes. Collision signal slot drop messages are sent from client nodes addressed to all network nodes.

US Patent:

6978318, Dec 20, 2005

Filed:

Jun 19, 2000

Appl. No.:

09/597371

Inventors:

Philip J. Keller - Fremont CA, US
Yatin R. Acharya - Sunnyvale CA, US
Matthew J. Fischer - Mountain View CA, US

Assignee:

Advanced Micro Devices, Inc. - Sunnyvale CA

International Classification:

G06F015/16

US Classification:

709250, 709227, 709236, 709253

Abstract:

A network interface includes a network medium interface operatively coupled to a software device driver arrangement, with a legacy media access controller (MAC) therebetween. The device driver arrangement includes a legacy MAC device driver configured to communicate with the legacy MAC, and an intermediate driver configured to communicate with the network medium interface. The intermediate driver and the network medium interface may communicate with one another by use of special frames, for example to send and receive control information. The special frames are formatted to pass through the legacy MAC, and include an identifier so that they can be identified at the intended destination, either the intermediate driver or the network medium interface. Upon identification, the control information is extracted at the destination. The network medium interface may include one or more MACs as well as one or more physical layer devices (PHYs).

US Patent:

7359406, Apr 15, 2008

Filed:

Apr 21, 2004

Appl. No.:

10/828687

Inventors:

John T. Holloway - Atherton CA, US
Matthew James Fischer - Mountain View CA, US
Jason Alexander Trachewsky - Palo Alto CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04J 3/06
H04J 3/00
H04L 12/28

US Classification:

370503, 370345, 370350, 370401

Abstract:

A method of providing for synchronizing one or more synchronous terminals with one or more synchronous endpoints, each synchronous terminal and each synchronous endpoint having an asynchronous communications network coupled between at least one synchronous terminal and at least one synchronous endpoint. A synchronization protocol is established between a synchronous terminal and a synchronous end point by providing a gateway between the asynchronous communications network and the synchronous end point, the gateway communicating with the synchronous terminal over the asynchronous communications network in accordance with the synchronization protocol. The synchronization protocol includes sending a message from the gateway to the synchronous terminal, the message containing a timestamp identifying a clock associated with the synchronous end point. The synchronous terminal establishes a clock associated with the synchronous terminal by creating a clock estimate based upon the timestamp message and access jitter expected from the asynchronous communications network such that the clock associated with the synchronous terminal enables packet sampling and transmission onto the asynchronous communications network to and from the synchronous terminal to be synchronized with the clock associated with the synchronous end point.

US Patent:

7706338, Apr 27, 2010

Filed:

Jul 14, 2005

Appl. No.:

11/181548

Inventors:

George D. Kondylis - Palo Alto CA, US
Ling Su - Cupertino CA, US
Neal Nuckolls - Mountain View CA, US
Bruce E. Edwards - Belmont MA, US
Matthew J. Fischer - Mountain View CA, US
Jason Trachewsky - Menlo Park CA, US
Stephen R. Palm - Irvine CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04W 4/00

US Classification:

370338, 370445

Abstract:

A method and system for a bandwidth efficient medium access control (MAC) protocol is provided, which may comprise communicating a request to transmit (RTS) signal to a receiving station to determine if a channel is available for transmission. A clear to send (CTS) acknowledgement signal may be received from the receiving station if the channel is available for transmission. A plurality of medium access control (MAC) protocol data unit (MPDU) fragments separated by a point coordination function (PCF) interframe space (PIFS) interval may be transmitted in response to the received CTS acknowledgement signal.

US Patent:

8170495, May 1, 2012

Filed:

Apr 22, 2009

Appl. No.:

12/428156

Inventors:

Jason A. Trachewsky - Menlo Park CA, US
Jeyhan Karaoguz - Irvine CA, US
Christopher J. Hansen - Sunnyvale CA, US
Saishankar Nandagopalan - San Diego CA, US
Vinko Erceg - Cardiff by the Sea CA, US
Matthew J. Fischer - Mountain View CA, US
Murat Mese - Rancho Palos Verdes CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H01Q 3/00
H04B 1/38
H04B 7/02

US Classification:

455 73, 4555621

Abstract:

A wireless transceiver includes at least one phased array antenna, that transmits an outbound RF signal containing outbound data to a remote transceiver and that receives an inbound RF signal containing inbound data from the at least one remote RF transceiver, wherein the at least one phased array antenna is configurable based on a control signal. An antenna configuration controller generates the control signal to configure the phased array antenna to hop among a plurality of selected radiation patterns that are collaboratively selected by the wireless transceiver and the remote transceiver via a pairing procedure. At least one RF transceiver section generates the outbound RF signal based on the outbound data and that generates the inbound data based on the inbound RF signal.

US Patent:

8473732, Jun 25, 2013

Filed:

Mar 17, 2009

Appl. No.:

12/405354

Inventors:

Henry Ptasinski - San Francisco CA, US
Matthew Fischer - Mountain View CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

G06F 21/00

US Classification:

713150

Abstract:

Aspects of a method and system for protected MAC sequence numbers, as well as secure block acknowledgment (block ACK) with protected MAC sequence number are presented. In one aspect of the system a communicating station (STA) may protect the sequence number (SN) field portion of transmitted protocol data units (PDUs), for example data MAC layer PDUs (MPDUs), or frames. In another aspect of the system, starting sequence number (SSN) information communicated via control frames, such as block acknowledgment request (BAR) and block acknowledgment (BA) frames, may be protected. In another aspect of the system, communicating STAs may exchange management frames to enable the protection of SN information in data MPDUs and/or the protection of SSN values in control MPDUs.

US Patent:

8599804, Dec 3, 2013

Filed:

Aug 9, 2010

Appl. No.:

12/852859

Inventors:

Vinko Erceg - Cardiff by the Sea CA, US
Joseph Paul Lauer - North Reading MA, US
Matthew James Fischer - Mountain View CA, US
Peiman Amini - Mountain View CA, US
Joonsuk Kim - Saratoga CA, US

Assignee:

Broadcom Corporation - Irvine CA

International Classification:

H04W 4/00
H04L 12/28

US Classification:

370338, 370392

Abstract:

Distributed signal field for communications within multiple user, multiple access, and/or MIMO wireless communications. In accordance with wireless communications, a signal (SIG) field employed within such packets is distributed or partitioned into at least two separate signal fields (e. g. , SIG A and SIG B) that are located in different portions of the packet. A first of the SIG fields includes information that may be processed and decoded by all wireless communication devices, and a second of the SIG fields includes information that is specific to one or more particular wireless communication devices (e. g. , a specific wireless communication device or a specific subset of the wireless communication devices). The precise locations of the at least first and second SIG fields within a packet may be varied, including placing a second of the SIG fields (e. g. , including user-specific information) adjacent to and preceding a data field in the packet.