wimax
DESCRIPTION
WiMAX. CS441 Dr. Kemal Akkaya 12/8/2011. By: Chun-Cheng Chuang. Contents. What is WiMax Why WiMax WiFi vs. WiMax WiMax PHY/MAC layer Challenges Conclusion. What is WiMAX. Worldwide Interoperability for Microwave Access Wireless MAN ( Wireless Metropolitan Access Network ) - PowerPoint PPT PresentationTRANSCRIPT
WiMAX
CS441 Dr. Kemal Akkaya
12/8/2011
By: Chun-Cheng Chuang
2
Contents What is WiMax Why WiMax WiFi vs. WiMax WiMax PHY/MAC layer Challenges Conclusion
What is WiMAX Worldwide Interoperability for Microwave
Access Wireless MAN (Wireless Metropolitan Access
Network) Broadband wireless networks
based on the IEEE 802.16 standard.
3
4
What is WiMAX Offers data transfer rates of up to 75 Mbit/s A range of up to 30 miles to make broadband
network access widely available Without wires
Last Mile access
5
Why WiMax End-user are used to high bandwidth from
fixed sources Speed
higher range and speeds compared to 802.11 Wireless
Easier to extend to suburban and rural areas Broad Coverage
Much wider coverage that WiFi
6
WPAN vs. WLAN vs. MAN
Standard Transmission distance
Max rate
WPAN Bluetooth (802.15.1)Zigbee (802.15.4)
1~10 M 20 to 250 (Kbps)/ ~700 (kbps)
WLAN Wi-Fi(802.11 a/b/g) 50~100 M 11~54 (mpbs)
MAN WiMAX (802.16) 30 miles 75 (mbps)
7
WiMax PHY layer OFDM (orthogonal frequency division
multiplex) More advanced: MIMO (multiple-input and
multiple-output)
8
WiMax MAC layer Connection-oriented A fundamental premise of the MAC
architecture is quality of service (QoS) QoS provided via service flows
Applies to both downlink (DL) and uplink (UL)
9
WiMax MAC layerInterface to higher layer protocols, classifies incoming data, etc.
Core MAC functions (i.e., scheduling, connection maintenance,fragmentation), QoS control
Encryption, authentication, secure key exchange
Service Specific Convergence Sublayer
MAC Common Part Sublayer
Privacy Sublayer
10
Applyciation Metro Area Networks High-Speed Internet Clustered wifi hotspot Wireless VoIP Video-on-demand, video surveillance Education (rural schools & government orgs.)
11
Source :http://files.shareholder.com/downloads/INTC/1557442122x0x195859/40AB6084-0A42-4E87-9AD3-B08BADAA987F/wimax_and_wifi_together.pdf
12
Challenges Security issues Eavesdrop Masquerade
Instead of sending packet to server, client send it to Hacker.
(Hacker takes identity of server.)
13
Challenges Denial of Service
Attackers make resources (server, bandwidth) unavailable to client by overwhelming resource.
Jamming Block the service by sending out radio waves
along the same frequencies that WiMax use.
14
Conclusions WiMax may becomes the dominant standard
for Wireless MAN in the realistic market. WiMax connect you faster and from much
longer ranges An intrusion detection system approach and
firewall can be used to address some of the threats.
More research is needed.
15
References http://www.wimaxforum.org/
http://www.scribd.com/doc/59582733/WiMax-Final-Ppt
http://media.techtarget.com/searchMobileComputing/downloads/Finneran.pdf
16
Thank you!