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Figure 4.7 STA selection process for APs. Reproduced by permission of Dr. Morikura interframe space (SIFS). Because PIFS and SIFS are shorter than DIFS, STAs waiting to send frames with DIFS cannot transmit, so there is a collision-free period in PCF. In addition to the DCF and PCF access functions, the IEEE 802.11 MAC de nes a number of management functions. One of these is for an STA to access the speci c AP that manages the BSS. Figure 4.7 shows how the STA searches, authenticates, and nally associates to an adequate AP. The AP periodically broadcasts the operation information of the BSS in what is called a beacon frame. The STA listens to all beacons it can hear and then selects an adequate AP to associate. In turn, the AP needs to authenticate the STA sending the association request. The STA nally becomes a member of a BSS after this process is done. CSMA/CA With its basic concept of listen before talk, CSMA is widely used in wired and wireless communication networks as a MAC protocol to coordinate transmissions over a shared java code 128 reader Barcode Reader . Free Online Web Application
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