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New Standards for Wireless LANs

New Standards for Wireless LANs

1924 Beginning of Mobile

1924 Beginning of Mobile Communications • 1911 mobile transmitter on Zeppelin • 1926 train (Hamburg – Berlin) • 1927 first commercial car radio (receive only) • First Mobile Communication Systems started in the 40s in the US and in the 50s in Europe. - 14 - CONCEPTS: • Large Areas per Transmitter • „Mobiles“ large, high power consumption • Systems low capacity, interference-prone • Expensive !!! TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

Today's Wireless Communication (1) 1984 CT-1 standard (Europe) for cordless telephones – In Germany selling no longer permitted since 2009 1992 DECT – Digital European Cordless Telephone (today: Digital Enhanced Cordless Telecommunications) – 1880-1900MHz, ~100-500m range, 120 duplex channels, 1.2Mbit/s data transmission, voice encryption, authentication, up to several 10000 user/km 2 , used in more than 50 countries 1996 HiperLAN (High Performance Radio Local Area Network) – ETSI, standardization of type 1: 5.15 - 5.30GHz, 23.5Mbit/s – recommendations for type 2 and 3 (both 5GHz) and 4 (17GHz) as wireless ATM-networks (up to 155Mbit/s) – Did not enter market - 15 - TZI – FB 1 – Kommunikationsnetze Andreas Könsgen – Summer Term 2011

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