HVAC Control in the New Millennium.pdf - HVAC.Amickracing

Building Automation, Wireless Technology and the Internetization process. In time-division-multi-access (TDMA) networks, cellulardigital packet data (CDPD) can also be used to provide Internet access.High-speed circuit-switched data (HSCSD) will allow the downloadingof graphics-heavy pages from the World Wide Web (www) to beas simple over mobile as it is over terrestrial services. GPRS is perfect fore-mail and data access services, where users do not want to pay high callcharges for short transmissions. GPRS also allows the user to receivevoice calls simultaneously when sending or receiving data calls.HSCSD has built-in bandwidth-on-demand capability. So, it willnot matter what speed the user needs for any particular application, theservice will provide whatever speed is required, up to 64 kb/s.Another emerging service is voice-over-IP, or Internet telephony.Voice-over-IP is generally delivered from one personal computer to anotherthrough modems and special software. Instead of running on general-purposeprocessors, improved voice quality is possible using digital-signal-processors(DSPs).Bellcore’s Mobile Network Computing Protocol (MNCP) for theInternet community may become an open standard. It is a generic protocolspecification that allows any cellular, personal-communicationsservices(PCS), or paging network to provide wireless Internet informationaccess from mobile computers and hand-held devices.This standard would allow portable and accessible mobile computingdevices to offer easy desktop connectivity and allow users to remotelyperform computer operations such as control system management.In the future networks and mobile phones will evolve in parallel toprovide services that are increasingly personalized to the users’ needs.This will happen as a result of increasing intelligence within the networksalong with increasing competition and segmentation for services.Smart AntennasSmart antennas are becoming integral elements of evolving analogand digital cellular networks. A smart antenna system is a highlyconfigurable antenna system that senses the radio environment, includingtraffic and interference levels, and then modifies its operation tooptimize performance for local conditions.The intelligence of the antenna system resides in the algorithmsthat monitor the RF environment and adjust the antenna’s radiation©2001 by The Fairmont Press, Inc. All rights reserved.