By Frank Ohrtman
Wi-MAX is a giant deal simply because it’s more affordable, smaller, less complicated and more straightforward to exploit than any latest broadband alternative (DSL, cable, fiber, 3G instant) – it additionally bypasses the present stressed infrastructure and legacy carrier services (i.e. the telephone and cable companies). This publication presents a simple technical creation to the IEEE general, permitting engineers, technologists, and decision-makers to envision how this highly disruptive know-how goes to impact their companies.
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Wi-MAX is a giant deal simply because it’s more affordable, smaller, easier and more uncomplicated to take advantage of than any current broadband choice (DSL, cable, fiber, 3G instant) – it additionally bypasses the present stressed infrastructure and legacy provider companies (i. e. the telephone and cable companies). This publication offers a easy technical advent to the IEEE common, permitting engineers, technologists, and decision-makers to envision how this highly disruptive know-how goes to impact their companies.
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Extra info for WiMAX Handbook
Figure 2-7 illustrates the frame structure for a TDD system. The frame is divided into DL and UL subframes. The DL subframe is made up of a preamble, Frame Control Header (FCH), and a number of data bursts. The FCH specifies the burst profile and the length of one or more DL bursts that immediately follow the FCH. The down- Figure 2-7 Frame structure for a TDD system (Source: IEEE) Frame DL Subframe DL-PHY PDU UL Subframe Contentioninitial ranging Contention bandwidth request UL-PHY PDU from SS #1 UL-PHY PDU from S SS #2 Preamb ble e UL burst Preamble FCH DL burst #1 DL burst #2 MAC PDUs DLFP DL-MAP, UL-MAP, DCD, UCD MAC C PDUs PAD MAC PDUs MAC Header MAC payload d C CRC WiMAX: The Physical Layer (PHY) 21 link map (DL-MAP), uplink map (UL-MAP), DL Channel Descriptor (DCD), UL Channel Descriptor (UCD), and other broadcast messages that describe the content of the frame are sent at the beginning of these first bursts.
1 Figure 2-5 illustrates this relationship. Figure 2-4 A TDD subframe Frame Header Figure 2-5 ULs and DLs between BSs and SSs Downlink Subframe TG Uplink Subframe Uplink: "Hello Base Station! This is a subscriber station checking in. " Downlink: "Welcome Subscriber Station! 16 Medium Access Control and Service Provisioning,” Intel Technology Journal 3, no. 3 (August 20, 2004): 216—217. Chapter 2 18 Figure 2-6 AAS uses beam forming to increase gain (energy) to the intended SS. Base Station Adaptive Antenna System (AAS) AAS is used in the WiMAX specification to describe beam-forming techniques where an array of antennas is used at the BS to increase gain to the intended SS while nulling out interference to and from other SSs and interference sources.
The request-grant mechanism is designed to be scalable, efficient, and self-correcting. The WiMAX access system does not lose efficiency when presented with multiple connections per terminal, multiple QoS levels per terminal, and a large number of statistically multiplexed users. Along with the fundamental task of allocating bandwidth and transporting data, the MAC includes a privacy sublayer that provides authentication of network access and connection establishment to avoid theft of service, and it provides key exchange and encryption for data privacy.
WiMAX Handbook by Frank Ohrtman