Wireless networks vs Fixed networks Restrictive regulations of frequencies Frequencies have to be coordinated useful frequencies are almost all occupied e LoW transmission rates Local 11N54 Mbit/s, regional currently, e.g., N40 kbit/s with GPRS/CDMA Higher loss-rates due to interference Emissions of, e.g. engines, lightning Higher delays, higher jitter Connection setup time with several hundred milliseconds for some wireless systemsWireless Networks vs. Fixed Networks • Restrictive regulations of frequencies – Frequencies have to be coordinated, useful frequencies are almost all occupied • Low transmission rates – Local 11~54 Mbit/s, regional currently, e.g., ~40 kbit/s with GPRS/CDMA • Higher loss-rates due to interference – Emissions of, e.g., engines, lightning • Higher delays, higher jitter – Connection setup time with several hundred milliseconds for some wireless systems