Cisco Technology, Inc.

Imagination Technologies Limited

Locix, Inc.

Arnold Mark Bilstad

Paul Matthew Blay

Bretton Lee Douglas

Wenfeng Huang

Martin John Woodhead

Jose Juan Fernandez Dios

David Sheldon Stephenson

Timothy S Olson

Sheausong Yang

Huizhao Wang

David E Halasz

Xiaode Xu

Daryl Arnold Kaiser

Richard D Rebo

Jonathan S Leary

Metin Ismail Taskin

Tania Sung-Yi Chen

Jose Juan Fernández Dios

John Z Deng

Glade L Gauger

Robert Charles Meier

Rajneesh Kumar

Douglas A Smith

Prasad Prabhakar Jogalekar

Stuart Norman

Jay Wu Hong

Jason Kim

Daryl A Kaiser

A method at a first device for synchronising a first clock of the first device to a second clock of a second device, includes receiving a first message comprising an identifier from a third device; generating a first timestamp in dependence on the time at which the first message is received at the first device according to the first clock; receiving a second message from the second device comprising the identifier and a second timestamp, the second timestamp having been generated in dependence on the time at which the second device received the first message from the third device according to the second clock; and adjusting the first clock in dependence on a time difference between a time indicated by the first timestamp and a time indicated by the second timestamp.

Clock synchronisation between devices using message timestamps

Systems and apparatuses for determining location of a wireless arbitrary device are disclosed herein. In one example, a computer implemented method for localization of a wireless arbitrary device in a wireless network architecture comprises initializing the wireless network architecture having a plurality of wireless anchor nodes and a plurality of wireless sensor nodes. The method further includes preparing, with the plurality of wireless anchor nodes, for localization of the wireless arbitrary device, waiting to receive a packet from the wireless arbitrary device, receiving a communication including a packet from the wireless arbitrary device, and transmitting a communication including a synchronization packet to other anchor nodes of the plurality of wireless anchor nodes.

Systems and methods for precise radio frequency localization of a wireless arbitrary device

A first device operates synchronously with a second device, and includes a hardware clock having an adjustable clock frequency and a software clock configured to derive time in dependence on the hardware clock. A controller determines a synchronisation error between the software clock and a clock of the second device, and adjusts the clock frequency of the hardware clock in dependence on the synchronisation error so as to synchronise the hardware clock to a hardware clock of the second device.

Synchronisation of hardware clock using software clock synchronisation error

Clock synchronisation between devices using third device

Systems and apparatuses for determining location of a wireless arbitrary device are disclosed herein. In one example, an asynchronous system for localization of a wireless arbitrary device in a wireless network architecture includes a plurality of wireless anchor nodes each having a wireless device with one or more processing units and RF circuitry for transmitting and receiving communications in the wireless network architecture. The one or more processing units of at least one wireless anchor node are configured to receive instructions to prepare for localization of the wireless arbitrary device, to change a RF channel to be the same as an RF channel of the wireless arbitrary device based on the received instructions, to receive a communication including data traffic from the wireless arbitrary device, and to obtain ranging information including a receive timestamp and channel sense information (CSI) from the data traffic.

A first device for playing media synchronously with a second device, includes a hardware clock having an adjustable clock frequency; a software clock configured to derive time in dependence on the hardware clock; a controller configured to: determine a synchronization error between the software clock and a clock of the second device; and adjust the clock frequency of the hardware clock in dependence on the synchronization error; and a media playout device for playing media and configured to be clocked by the hardware clock.

Clock synchronisation

Reference synchronisation

A method at a first device for synchronising a first clock of the first device to a second clock of a second device, includes receiving a first message comprising an identifier from the second device; generating a first timestamp in dependence on the time at which the first message is received at the first device according to the first clock; receiving a second message from the second device comprising the identifier and a second timestamp, the second timestamp having been generated in dependence on the time at which the second device transmitted the first message to the first device; and adjusting the first clock in dependence on a time difference between a time indicated by the first timestamp and a time indicated by the second timestamp.

Master synchronisation

In one embodiment, different physical layer standards are segregated into different frequency channels. In one implementation, 802.11b traffic and 802.11g traffic are segregated into different frequency channels. A network management tool allows the user to specify channels to either, e.g., 802.11b-only, 802.11g-only, 802.11b preferred and 802.11g discouraged, or 802.11g preferred and 802.11b discouraged. Access points are given the capability of preventing or discouraging client traffic of either given type.

Performance optimization for wireless networks with mixed modulation types

In one embodiment, a network device receives a request from a client in association with a connection, where the request indicates an amount of one or more resources that is requested to support the connection. The network device determines whether the amount of the resources is available. The network device may then allocate a level of the resources to the connection according to whether the amount of the resources is available.

Policy-based resource management

Methods, apparatuses and systems directed to facilitating WLAN diagnostics and management using traffic stream metrics. In a data collection stage, according to one implementation of the present invention, localized uplink measurements are taken at a wireless client associated with a wireless access point. During periodic intervals (e.g., every 5 seconds), the wireless client, in one implementation, transmits uplink measurement information to the wireless access point. The wireless access point may also take downlink measurements, which may also include one or more of the following metrics: observed latency, queuing delay, packet loss rate, and packet count information. The wireless access point, in one implementation, may aggregate and report the uplink and downlink metric information to a network management system. In a diagnostic stage, according to one implementation, a wireless network management module performs diagnostics of the WLAN based on the uplink and/or downlink metrics received from the wireless access-point.

WLAN diagnostics using traffic stream metrics

Significant improvements in throughput of networks employing disparate physical layer standards are provided. Different physical layer standards are segregated into different frequency channels. In one implementation, 802.11b traffic and 802.11g traffic are segregated into different frequency channels. A network management tool allows the user to specify channels to either, e.g., 802.11b-only, 802.11g-only, 802.11b preferred and 802.11g discouraged, or 802.11g preferred and 802.11b discouraged. Access points are given the capability of preventing or discouraging client traffic of either given type.

Growing community of inventors

Los Altos, CA, United States of America

Arnold Mark Bilstad