Peng Li Fall2008 Ece5765 Introduction To Wireless Networks
WiMax - Technology & Architecture
1. Wi-MAX – Technology & Architecture
6 3 0 2 – A D VA N C E D W I R E L E S S C O M M U N I C AT I O N
D R . M E Q UA N I N T M O G E S
Presented By:
Syed Ashar Zia
2. Objectives
What is Wi-MAX?
Specifications of IEEE 802.16 standard
Revisions of standard
Operating frequencies
MAC & PHY layers
Data-Rate and throughput
WiMAX Network Architecture
Components of the network
References & Conclusion
By: SYED ASHAR ZIA 3/30/2012
3. Wireless Network Standards
Wireless WAN
Wireless LAN Wireless PAN Wireless MAN – Research
phase
IEEE IEEE IEEE IEEE
802.11 802.15 802.16 802.20
Wireless WiMAX LTE
Fidelity Bluetooth (Worldwide
Interoperability (Long Term
(Wi-Fi) for Microwave Evolution)
Access)
By: SYED ASHAR ZIA 3/30/2012
8. Network Speed
According to the standards, WiMAX can support up to
a 75 Mbps data rate (single channel) and cover up to
30 miles.
It has a throughput that is much higher than Wi-Fi and
current cellular 2G and 3G networks.
For a channel size of 20 MHz, WiMAX can support a
sector data rate of about 11 Mbps on the downlink and
1.36 Mbps on the uplink.
By: SYED ASHAR ZIA 3/30/2012
9. Services
WiMAX supports the Quad-Play Entertainment.
Quad-Play includes:
Broadband
Cable TV
Landline
Mobile Phones
Most commonly provided services with WiMAX are
broadband and VoIP. Cable TV is not offered by most of
the WiMAX Operators.
By: SYED ASHAR ZIA 3/30/2012
10. Operating Frequencies
10 – 66 GHz frequency ranges are used for LOS
point-to-point links.
2 to 11 GHz spectrum was introduced for point-to-
multipoint and NLOS links.
By: SYED ASHAR ZIA 3/30/2012
11. Channel Bandwidth
WiMAX profiles define 4 standard bandwidths which
are 3.5 MHz, 5 MHz, 7 MHz and 10 MHz.
By: SYED ASHAR ZIA 3/30/2012
12. MAC & PHY Layers
PHY layer:
SC
OFDM
OFDMA
MAC Layer:
Security Sub-Layer
Common Part Sub-Layer
Convergence Layer
Convergence layer offers
interoperability among
different types of
networks.
By: SYED ASHAR ZIA 3/30/2012
13. Antenna Systems
Uses MIMO (Multiple Input and Multiple Output)
antenna systems.
Adaptive Modulation technique is used based on radio
condition.
Signals are modulated according to the radio conditions.
Best Conditions – 64 QAM
Worst Conditions – BPSK
Parameters used to diagnose radio conditions are:
CINR – Carrier to Interference of Noise Ratio (SNR).
RSSI – Received Signal Strength Indicator.
By: SYED ASHAR ZIA 3/30/2012
17. Access Service Network (Contd.)
Three components only:
EMS – Element Management System
Base Station or WiMAX Access Point (AP)
ASN Gateway – Links ASN to CSN
ASN provides radio connection for the subscriber (MS)
ASN is responsible of:
Radio Resource Management.
Mobility Management.
Handover control.
EMS is database used for routing the traffic to desired
server in CSN
By: SYED ASHAR ZIA 3/30/2012
19. Connectivity Service Network (Contd.)
CSN is responsible for subscribers IP connectivity.
Components in CSN are:
AAA Server:
Authentication, Authorization and Accounting.
Manages CPE authentication.
Provide the network with profile information of each subscriber.
DNS Server:
Domain Name Server.
Translates the Domain Names into IP Addresses.
By: SYED ASHAR ZIA 3/30/2012
20. Connectivity Service Network (Contd.)
DHCP Server:
Dynamic Host Configuration Protocol Server.
Provides IP to entities in network (including Subscribers)
dynamically.
DHCP allows IPs to be assigned automatically to the computer.
Home Agent (HA):
Special routers that work to provide a data “tunnel”.
Gateways:
VoIP and Data gateways for connectivity outside CSN.
By: SYED ASHAR ZIA 3/30/2012
22. Network Service Provider (Contd.)
NSP network provides all the services and features
which are offered by the carrier/operator.
Services may include:
Voice over IP.
Streaming audio & video programs.
Internet access.
E-Mail.
Instant Messaging.
Access to databases.
These services are completely independent of WiMAX
access network.
By: SYED ASHAR ZIA 3/30/2012
23. THE END
Questions?
BY: SYED ASHAR ZIA 3/30/2012
