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Explain WIMAX frame structure and various MAC fields such as DLMAP, DCD, ULMAP and UCD and their significance?
Answer:
In order to understand wimax frame structure interviewee need to understand and explain frame structure of both OFDM and OFDMA physical layers. Basic OFDM wimax frame consists of preamble part, header part (FCH) and downlink bursts (1 to 4). Preamble is used for synchronization purpose. FCH is always BPSK1/2 and carry modulation-code rate information of consecutive downlink bursts as well as their lengths in number of symbols. Downlink burst no.1 carry DLMAP, DCD, ULMAP, UCD. DLMAP and ULMAP specify the position of downlink bursts and uplink bursts in the entire wimax frame. DCD and UCD specify downlink channel descriptor and uplink channel descriptor which in turn map to modulation-code rate for the bursts i.e DIUC and UIUC.
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