Despite the high capacity offered by wired transmissions, the rapid growth
of Internet services and increasing interest in new usages and applications on nomadic
computing devices like on-demand video streaming, video conferencing and multi-media
applications are likely to create a strong demand for high-speed wireless data services.
Especially in the downlink, high throughput is needed since the number of downloads of
large data files from web sites and servers will increase and broadcast / multicast
services may become a reality, that has to be accommodated by 4G systems. Moreover,
broadband Fixed Wireless Access has advantages versus wired counterparts, such as large
range capabilities, rapid deployment, high scalability, lower maintenance and upgrade
costs, granular investment to match market growth and low mobility. It will hence be a
relevant candidate for new access infrastructures, e.g. in Eastern Europe or developing
countries. The European vision for this new generation is one of a fully IP-based
integrated system offering all services, all the time and designed to support multiple
classes of terminals. This system will have to address two key issues: n An optimised use
of available spectral resources through enhanced technologies such as Multiple Transmit
Multiple Receive (MTMR) techniques using pre-equalization, joint detection allowing
simultaneous communications from and towards multiple subscribers, and n A seamless
interworking and cooperation of existing standards (WMAN and WLAN) ensuring both an
end-to-end quality of service and the in-house and out-house coverage. These points are
studied and demonstrated in STRIKE for the fixed wireless access relying on interworking
between HIPERMAN and HIPERLAN. In fact, since HIPERLAN is foreseen to be proposed in the
major high-density areas, a standard switching from FWA to HIPERLAN is attractive and will
lead to low cost information delivery in buildings. |