Cisco Systems Wireless Networking (australia) Pty Limited

Commonwealth Scientific and Industrial Research Organisation

David James Skellern

Philip J Ryan

John D O'Sullivan

Andrew Robert Adams

Neil Weste

Richard A Keaney

John Fraser Deane

Terence Michael Paul Percival

Sihui Zhou

Alex Chun Kit Lam

Andrew Frederick Myles

A wireless computer data network includes several untethered mobile units that make ad-hoc data connections with an Internet-connected base station using the IEEE-802.11a standard. Each unit includes a radio transceiver fully integrated on a single semiconductor chip. The receiver portion is a double-conversion superheterodyne type, and shares the same intermediate and local oscillator frequencies with a two-stage up-conversion transmitter. Two on-chip synthesizers that each include a voltage-controlled oscillator and phase-locked loop can be operated independently for each conversion stage, or operated in offset mode. External reference frequencies can be injected for voltage-controlled oscillator and phase-locked loop testing, chip characterization, and automatic compensation modeling. Each mobile and base unit can be outfitted with transmit/receive antenna transfer switches, RF-power amplifiers, and low-noise receiver amplifiers to increase operating range.

Wireless computer network including a mobile appliance containing a single chip transceiver

A method for controlling communication between a hub and a plurality of distributed stations over a medium is disclosed. The method comprising the steps of a method for controlling communications access between a hub () and a plurality of distributed stations (M-M) over a medium, the method comprising the steps of (a) allocating a plurality of channels for data communications between the station (M-M) and the hub (), the number of channels being at least equal to the number of stations, (M-M) and each station owning at cast one channel, each channel being varyingly in one of an empty-, a reserved, or an owner-state, and whereby (i) the empty-state provides a channel to which any station (M-M) can have access; (ii) the reserved-state provides a channel to which a station (M-M) having made a reservation with the hub (), but not owning the channel, can have access; and (iii) the owner-state provides a channel to which only the owning station (M-M) has access; and (b) allocating the respective state and/or the number of channels over time an the basis of each station's data requirements.

Medium access control protocol for data communications

Growing community of inventors

Roseville, Australia

David James Skellern