WiMAX
Presented By
Ch.Srinivas Koundinya
118T1A0435
Internet Connections
Three traditional ways to connect Internet:
1)Dial-up access – It is an Internet connection that will be established by
using a modem which act as data transfer medium when user initiates dial
up connection.
2)Broadband access -This refers to high-speed data transmission in
which a single cable(DSL cable,modem) can carry a large amount of data
at once.
3)WiFi access - Wi-Fi refers to wireless networking technology that
allows computers and other devices to communicate over a wireless signal.
IEEE 802.16 Specifications
•
Range - 30-mile (50-km) radius from base station
•
Speed - 70 megabits per second
•
Line-of-sight not needed between user and base station
•
Frequency bands - 2 to 11 GHz and 10 to 66 GHz (licensed and
unlicensed bands)
•
Defines both the MAC and PHY layers and allows multiple PHY-layer
specifications.
What is WiMAX ?
•
WiMAX is short for
Microwave Access”
“Worldwide
Interoperability
for
•
WiMAX is technically also known as “IEEE 802.16”
•
WiMAX is a wireless communications standard designed for
creating Metropolitan Area Networks(MANs).
•
It is similar to the Wi-Fi standard, but it can broadcast as big as
3,000 square miles.
Architecture of WiMAX
A WiMAX system consists of two parts:
•
WiMAX receiver:
The receiver could be a small box or PCMCIA card, or they could
be built into a laptop the way Wi-Fi access is today.
•
WiMAX tower:
It can provide cover to a very large area as big as 3,000 square
miles.
ISP Network
Internet
Backbone
WiMAX 802.16
Transmitter
Home Local Area
Network
Comparison with
other Wireless
Technologies
Maximum Speed Supported
•
WiMAX 802.16 - 280Mbps
•
3G - up to 2 Mbps
•
Wi-Fi - up to 600 Mbps
•
Mobile-Fi -- up to 80 Mbps
Coverage Area
•
WiMAX 802.16a/Rev d - 30 Miles Max
•
WiMAX 802.16 - 1 – 3 Miles
•
WiMAX 802.16e - 1-3 Miles.
•
3G and Mobile-Fi - 5 Miles
•
Wi-Fi 802.11 - 300 feet
•
Wi-Fi router - 30 Feet
Airwave
•
3G and Mobile-Fi 802.20 are the licensed ones
•
WiMAX 802.16 can be either Licensed or Unlicensed
•
Wi-Fi 802.11 is an unlicensed one.
Channel Condition
•
The WiMAX 802.16, 3G and Wi-Mobile 802.20 is optimized for
Outdoor Non- Line of Sight
•
Wi-Fi 802.11 is Line of Sight based.
Quality of Service
WiMAX 802.16
•
Grant request MAC
•
Designed to support voice and video from the start
•
supports differentiated service levels and centrally enforced QoS
Wi-Fi 802.11
•
Contention – based MAC
•
No guaranteed QoS
•
Standard Cannot guarantee latency for voice or video
•
No allowance for differential levels of service on a per user basis
•
Proposed 802.11e QoS standard is prioritization only
Bandwidth
 WiMAX
 802.16 - 20-28 MHz
 802.16a/Rev d - 1.5 -210MHz
 802.16e - 3.6MHz
 Wi-Fi
802.11 - 20MHz
 Wi-MAX
 Wi-Fi
802.165 supports Maximum 5.0 bps/Hz
802.11 Supports only up to a maximum 2.7 bps/Hz.
Scalability
For WiMAX 802.16
•
the channel bandwidths can be chosen by the operator for the
sectorization and scalable independent of bandwidth with
1.5MHz to 20MHz width channels
•
MAC also supports thousands of users
where as Wi-Fi 802.11 has only wide 20MHZ channels and MAC
only supports tens of users.
Advantages
•
WiMAX 802.16 is surely an advanced technology when compared
with the other technologies with more
 Bandwidth
 Bit rate
 Coverage area
 Performance
 Quality of service and secure too.
Disadvantages
•
Interference with Bluetooth wireless communication
•
The cost of equipment is really high and it has not yet widely
used.
•
Power-consuming technology
•
High installation
•
Signal interruption in bad weather
Present research work on WiMAX
•
WiMAX2 is the present ongoing development in the WiMAX
versions.
•
That is to increase the speed of existing WiMAX network.
•
Currently existing WiMAX versions provides minimum of 30 to
40 megabits per second of speed.
•
But the goal of the WiMAX2 is to get 100 Mbit/s for mobile
devices and 1 Giga bits per second fixed type of WiMAX devices
and 4G for next generation mobile network.
Thank You
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