WIMAX
PRESENTED BY-
SHAKIL MUHAMMAD
UET PESHAWAR
Contents
Introduction
Working of WIMAX
Features of WIMAX
Advantages of WIMAX over WIFI
Future of WIMAX
What is WIMAX?
WIMAX stands for Worldwide Interoperability for Microwave Access
WiMAX refers to broadband wireless networks that are based on the IEEE 802.16 standard, which ensures compatibility and interoperability between broadband wireless access equipment
primarily aimed
To get rid of expense of stringing wires (as in cable-access broadband)
and the distance limitations of Digital Subscriber Line
Wide availability of network access
NEW TECHNOLOGY
Broadband access is too expensive and WiFi coverage is very sparse.
The new technology promises
High speed of broadband service
Wireless rather than wired access
Broad Coverage
1) A WiMAX tower- similar in concept to a cell-phone tower .it transmits signals and gives coverage to a very large area
2) A WiMAX receiver - The receiver and antenna could be a small box or Personal Computer Memory card, or they could be built into a laptop the way WiFi access is.
A WIMAX system consists of
WIMAX TOWER WIMAX RECEIVER
HOW WIMAX works?
WIMAX CHIPS
FEATURES OF WIMAX
Scalability
Quality of Service
Range
Coverage
Scalability
The 802.16 standard supports flexible radio frequency (RF) channel bandwidths.
The standard supports hundreds or even thousands of users within one RF channel
As the number of subscribers grow , the spectrum can be reallocated with process of sectoring.
Quality of Service
Primary purpose of QoS feature is to define transmission ordering and scheduling on the air interface
These features often need to work in conjunction with mechanisms beyond the air interface in order to provide end to end QoS or to police the behaviour.
RANGE
Optimized for up to 50 Km
Designed to handle many users spread out over kilometres
Designed to tolerate greater multi-path delay spread (signal reflections) up to 10.0μ seconds
Coverage
Standard supports mesh network topology
Optimized for outdoor performance
Standard supports advanced antenna techniques
BENEFITS OF WIMAX
Speed
Faster than broadband service
Wireless
Not having to lay cables reduces cost
Easier to extend
Broad Coverage
Much wider coverage than WiFi hotspots
Benefits to Customers
DSL-like services at DSL prices but with portability
Rapidly declining fixed broadband prices
No more DSL “installation” fees from incumbent
Why not WIFI
Scalability
Relative Performance
Quality of Service
Range
Coverage
Security
Scalability
• Channel bandwidths can be
chosen by operator (e.g. for
sectorization)
• designed to support thousands
of users.
• Wide (20MHz) frequency
channels
• designed to support 10’s of
users
WIMAXWIFI
5.0 bps/Hz100 Mbps1.5 – 20 MHzWIMAX
2.7 bps/Hz54 Mbps20 MHzWIFI
Maximum
bps/Hz
Maximum
Data Rate
Channel
Bandwidth
RELATIVE PERFORMANCE
Quality of Service
• Designed to support Voice and
Video from ground up
• Supports differentiated service
levels: e.g. T1 for business
customers; best effort for
residential.
• Standard cannot currently
guarantee latency for Voice, Video
• Standard does not allow for
differentiated levels of service on a
per-user basis
•
WIMAXWIFI
Range
• Optimized for up to 50 Km
• Designed to handle many users
spread out over kilometers
• Designed to tolerate greater
multi-path delay spread (signal
reflections) up to 10.0μ seconds
• Optimized for ~100 meters
• No “near-far” compensation
• Designed to handle indoor multi-
path delay spread of 0.8μ seconds
WIMAXWIFI
Coverage
• Optimized for outdoor
performance
• Standard supports mesh network
topology
• Standard supports advanced
antenna techniques
• Optimized for indoor
performance
• No mesh topology support within
ratified standards
WIMAXWIFI
USES OF WIMAX
FUTURE
WiMax will be deployed in three stages
In the first phase provides fixed wireless connections
In the second phase WiMaX will be available as a cheap and self-installing Subscriber Terminal (ST), linked to PC and to antenna
The third phase enables portability, thus WiMAX will be integrated into commercial laptops
Any question?