iBurst

Burst (or HC-SDMA, High Capacity Spatial Division Multiple Access) is a wireless broadband technology which optimizes the use of its bandwidth with the help of smart antennas.

Description

HC-SDMA was announced as considered by ISO TC204 WG16 for the continuous communications standards architecture, known as Communications, Air-interface, Long and Medium range (CALM), which ISO is developing for intelligent transport systems (ITS). ITS may include applications for public safety, network congestion management during traffic incidents, automatic toll booths, and more.

The HC-SDMA interface provides wide-area broadband wireless data-connectivity for fixed, portable and mobile computing devices and appliances. The protocol is designed to be implemented with smart antenna array techniques (called MIMO for multiple-input multiple-output) to substantially improve the radio frequency (RF) coverage, capacity and performance for the system.

Technology

The HC-SDMA interface operates on a similar premise as cellular phones, with hand-offs between HC-SDMA cells repeatedly providing the user with a seamless wireless Internet access even when moving at the speed of a car or train.

The protocol:

·         specifies base station and client device RF characteristics, including output power levels, transmit frequencies and timing error, pulse shaping, in-band and out-of band spurious emissions, receiver sensitivity and selectivity;

·         defines associated frame structures for the various burst types including standard uplink and downlink traffic, paging and broadcast burst types;

·         specifies the modulation, forward error correction, interleaving and scrambling for various burst types;

·         describes the various logical channels (broadcast, paging, random access, configuration and traffic channels) and their roles in establishing communication over the radio link; and

·         specifies procedures for error recovery and retry.

The protocol also supports Layer 3 (L3) mechanisms for creating and controlling logical connections (sessions) between client device and base including registration, stream start, power control, handover, link adaptation, and stream closure, as well as L3 mechanisms for client device authentication and secure transmission on the data links.

Usage

Various options are already commercially available using:

·         Desktop modem with USB and Ethernet ports (with external power supply)
·         Portable USB modem (using USB power supply)
·         Laptop modem (PC card)
·         Wireless Residential Gateway
·         Mobile Broadband Router