broadband wireless david aeschbacher 4/6/2007 what is broadband wireless? 802.16 wimax motorola...
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Broadband WirelessDavid Aeschbacher
4/6/2007
What is Broadband Wireless? 802.16 WiMAX Motorola Canopy 802.11 StarOS Summary of Current Solutions Obstacles to Starting and Maintaining a WISP Future of Broadband Wireless
What is Broadband Wireless?
Wireless Broadband is new and exciting way of providing high-speed network and Internet over large distances.
Data-rates are typically between 2mbits/sec and 100mbits/sec
Best solution OFDM, offers higher data-rates and long distances
Licensed and unlicensed bands are used Useful for rural areas where there are no
alternatives (cable, FiOS, or DSL) Future availability in mobile devices
Broadband Wireless (cont.)
A typical WISP set-up consists of an access point (AP) placed on a tall building, water tower, guyed lattice towers.
APs can be set up in a sector, with an omni directional antenna, or as a point to point connection
A wireless bridge is used to receive and transmit to the AP
LOS is desired but not required for all wireless broadband technologies.
The IEEE 802.16 Standard IEEE 802.16 working group for wireless metropolitan
area networks 802.16 has been dubbed “WiMAX” (akin to 802.11
WiFi) 802.16e “Mobile WiMAX” 802.16h - Improved Coexistence Mechanisms for
License-Exempt Operation 802.16m “Advanced air interface” - increased data-
rates The standard may advertise itself as a metropolitan area
solution but certainly has applications in non-metro areas
The IEEE 802.16 Standard cont.
Operates on many different bands. 3.5ghz and 5.8ghz currently and 700mhz, 2.3ghz, 2.5ghz, 3.7ghz, 4.9ghz, 5.4-5.7ghz sometime in the future.
This gives you the choice to use licensed or unlicensed bands
OFDM and OFDMA now, scalable OFDM in the future
802.16-2004 is the current standard for MAC
What is WiMAX Good For?
Telephone networks, A/V multicast, IP services, Back-haul
Nomadic mobile devices “Last-mile” delivery of service – this is what you
are most likely to see in St. Lawrence County. Other means of broadband Internet access rarely reach outside of villages leaving many people to depend on poor phone lines to deliver already slow dial-up service.
WiMAX offers a standard that will ensure interoprability between devices/networks/regions
WiMAX Devices
Motorola Canopy
Motorola's proprietary solution to broadband wireless
Operates on 900mhz, 2.4ghz, and 5.8ghz unlicensed frequency bands
Data-rates depend on the level of a license that is purchased with the subscriber module (bridge) and can be configured from the device interface
Can work at distances greater than 40miles using less that 28dm of power, depending on antenna type
FSK for SMs, OFDM for Back-hauls
Examples of Canopy Equipment
802.11 as a Broadband Wireless Solution
The advantages of using 802.11a/b/g are that it is cheap and readily available
Unfortunately the popularity of the standard makes it easier for people gain unauthorized access to the network
802.11a/b/g typically has a range of only 300' but using high gain directional antennas a LOS connection can be made at 1 to 2 miles or farther using <400mw of transmit power
StarOS
Valemount Networks Runs on “warboards” A warboard is a computer (think itx size) that acts
a router/bridge/access point. A warboard has slots for 1-4 slots for mini-pci
wireless cards, 900mhz or 2.4ghz (a/b/g) StarOS allows you to configure the device in many
different ways, mac filtering, PPPoE, bandwidth management
Summary of Current Solutions
WiMAX – Still rather new and working its way into the marketplace, could revolutionize wireless communications
Motorola Canopy – Currently available and in use, serves multiple purposes
802.11 – Very affordable, can be used for short to medium distances, maybe a little too common
Obstacles of Starting and Maintaining a WISP
Cost – High quality APs cost many thousands of dollars and SMs range from $200-$1000 each. Bandwidth in rural areas costs more than in a metropolitan area. (10mbit $1000/month) A typical cable Internet connection can reach upwards of 5mbit, so it is hard to deliver comparable speeds at reasonable prices.
Geography – Hills and trees greatly affect the range and speed of the connection. 40 miles LOS is easy to accomplish in some areas whereas 6 miles non-LOS is extremely difficult in some parts of St. Lawrence.
Future of Broadband Wireless
802.20 MBWA – Mobile Braodband Wireless Access, potential competitor to mobile WiMAX
Larger companies moving – Verizon and Cingular can use their vast existing infrastructure to deliver BWA into peoples homes
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