Telecommunications Blog

WiMAX (Worldwide Interoperability for Microwave Access) ( 802.16 - 802.16e ).WIMAX was developed to promote conformance and interoperability of the IEEE 802.16 standard (Wireless MAN).


we will learn how we can planning a wimax network but first we should know some important things .

 
Frequency Planning :

         • The frequency re-use is extremely important in reducing the interference and therefore increasing the capacity
         • Off-the-shelf frequency assignment do not minimize the deployment cost for your system.
         • An optimum frequency assignments can be applied by considering
         • Site locations
         • Power levels
         • User distribution
         • Spectrum availability
         • Geography and building characteristics.


Site Features Optimization

         • Number of antennas
         • Antenna directions
         • Antenna heights
         • Antenna powers
         • Antenna tilts
         • Number of channels
         • Frequency of channels
         • OFDM Parameters
         • Cyclic prefix
         • Number of subchannels
         • Subchannelization rates
         • Available modulations
         • Handover parameters
         • MIMO settings
         • Uplink / Downlink traffic ratios
         • Voice over IP related issues
         • Backhaul planning: fiber, minilink, HDSL…. capacity issues

  Both are 4G technologies designed to move data rather than voice. Both are IP networks based on OFDM (Orthogonal Frequency Division Multiplexing) technology.

   WiMax is based on a IEEE standard (802.16),Depending on the spectrum alloted for WiMax deployments and how the network is configured, this can mean a WiMax network is cheaper to build.

     WiMAX offers peak wireless data speeds of up to 60 Mbps on the downstream and 25 Mbps for sending data upstream.

    Long Term Evolution (LTE), can ferry data to you at download speeds of 100 Mbps and support upload speeds of 50 Mbps.

    That means you can download about two 5-minute MP3 files every second. Think about that. Sure, it would only take WiMAX about seven minutes to download a single 5-minute MP3 file, which is still fast, but it’s nowhere near the theoretical scale of LTE.

    The IEEE Standards Association has given its seal of approval to the next generation WiMAX standard, dubbed 802.16m. The new standard supports a “wide range of data rates in multiple user environments” and has a theoretical maximum throughput of around 300Mbps.



     ” The standards group notes that 802.16m will provide the speed and performance necessary to support future advanced services and applications for next generation broadband mobile communications.”  said Dr. Roger Marks, Chairman of the 802.16 Working Group.

  WiMAX has four fundamental architectural components:


Base Station (BS) : 

      The BS is the node that logically connects wireless subscriber devices to operator networks. The BS maintains communications with subscriber devices and governs access to the operator networks. A BS consists of the infrastructure elements necessary to enable wireless communications, i.e., antennas, transceivers, and other electromagnetic wave transmitting equipment.

      BSs are typically fixed nodes, but they may also be used as part of mobile solutions , for example, a BS may be affixed to a vehicle to provide communications for nearby WiMAX devices. A BS also serves as a Master Relay-Base Station in the multi-hop relay topology .

WiMAX (Worldwide Interoperability for Microwave Access) ( 802.16 - 802.16e )


     It was defined by the WiMAX Forum is a telecommunication protocol that provided fixed and fully mobile broadband access (IEEE 802.16e ). WIMAX was developed to promote conformance and interoperability of the IEEE 802.16 standard (Wireless MAN). Meanwhile WIMAX Forum is the organization which dedicated to certifying the interoperability of broadband wireless access (BWA). WIMAX Forum will conduct the testing to ensure that different mobile broadband system from many manufactures work properly.