WiMAX & Wi-Fi Presented by Muhibbul Muktadir Tanim Assistant Manager IT Infrastructure & Operations QUBEE [email protected] Contents  Standard Overview Wi Fi WIMAX • Overview • Overview • IEEE Standard • Functional Entities • 2.4 GHz Channel Distribution • IEEE Standard & Improved Features • Security Standard • Layers • Network Architecture • Principles • How does it work • Devices • Elements • Network Reference Model • Security Enhancements • Technical Features • WiMAX - Wi-Fi Internetworking • Mechanism / How does it work • WiMAX – Wi-Fi Hotspot • Architecture • Security Enhancements • Applications  Comparison between WiMAX & Wi-Fi  Deployment & Implementation Experience  Operational Challenge 3/4/2012 WiMAX& Wi-Fi 2 Standard Overview 802:11b to 102.16e • The evolution of wireless LAN started with the introduction of the 802.11b standard in 1999. • In the same year, the 802.11a started introduced the Orthogonal Frequency Division Multiplexing (OFDM). • In 2003, "the best" of both standards were joined to the 802.11g standard. • While all former standards were used for "small networks" with no network operator required (SOHO), the first 802.16 standard, which was introduced at the end of 2001, provided an operator-based standard. 3/4/2012 WiMAX & Wi-Fi 3 Standard Overview 802:11b to 102.16e 3/4/2012 WiMAX & Wi-Fi 4 Wi-Fi • Overview • IEEE Standard • 2.4 GHz Channel Distribution (Non-Overlap) • Security Standard • Network Architecture • How does it work • Elements • Security Enhancements • WiMAX - Wi-Fi Internetworking • WiMAX – Wi-Fi Hotspot 3/4/2012 WiMAX & Wi-Fi 5 Wi-Fi : Overview • Describes only narrow range of connectivity ensuring Wireless Local Area Network • IEEE 802.11 Standard • Establish and enforce standards for Interoperability and backward compatibility Certification Process o Requires conformance to the IEEE 802.11 radio standard o WPA and WPA2 Security standards o EAP Authentication standard 3/4/2012 WiMAX & Wi-Fi 6 Wi-Fi : IEEE Standard Wi-Fi Networks use Radio Technologies to transmit & receive data at high speed: • IEEE 802.11b • IEEE 802.11a • IEEE 802.11g • IEEE 802.11n 3/4/2012 WiMAX & Wi-Fi 7 IEEE 802.11b • Appear in late 1999 • Operates at 2.4GHz radio spectrum • 11 Mbps (theoretical speed) - within 30 m Range • 4-6 Mbps (actual speed) • 100 -150 feet range • Most popular, Least Expensive • Has 11 channels, with 3 non-overlapping • Interference from mobile phones and Bluetooth devices which can reduce the transmission speed. 3/4/2012 WiMAX & Wi-Fi 8 IEEE 802.11a • Introduced in 2001 • Operates at 5 GHz (less popular) • 54 Mbps (theoretical speed) • 15-20 Mbps (Actual speed) • 50-75 feet range • More expensive • Not compatible with 802.11b 3/4/2012 WiMAX & Wi-Fi 9 IEEE 802.11g • Introduced in 2003 • Combine the feature of both standards (a,b) • 100-150 feet range • 54 Mbps Speed • 2.4 GHz radio frequencies • Compatible with ‘b’ 3/4/2012 WiMAX& Wi-Fi 10