TAILIEUCHUNG - Wireless Format

IEEE is a set of standards for implementing wireless local area network (WLAN) computer communication in the , , 5 and 60 GHz frequency bands. They are created and maintained by the IEEE LAN/MAN Standards Committee (IEEE 802). The base version of the standard was released in 1997 and has had subsequent amendments. These standards provide the basis for wireless network products using the Wi-Fi brand. | IEEE Architecture Physical Layer MAC Layer Addressing Mechanism Figure BSSs Figure ESS Figure Physical layer specifications Figure MAC layers in IEEE standard Figure CSMA/CA and NAV Figure Frame format Table Subfields in FC field Field Explanation Version The current version is 0. Type Type of information: management (00), control (01), or data (10). Subtype Defines the subtype of each type (see ). To DS Defined later. From DS Defined later. More flag When set to 1, means more fragments. Retry When set to 1, means retransmitted frame. Pwr mgt When set to 1, means station is in power management mode. More data When set to 1, means station has more data to send. WEP Wired equivalent privacy. When set to 1, means encryption implemented. Rsvd Reserved. Control Frame Control frames Table Values of subfields in control frames Subtype Meaning 1011 Request to send (RTS) 1100 Clear to send (CTS) 1101 Acknowledgment (ACK) Management Frame Data Frame Table Subfields in FC field To DS From DS Address 1 Address 2 Address 3 Address 4 0 0 Destination station Source station BSS ID N/A 0 1 Destination station Sending AP Source station N/A 1 0 Receiving AP Source station Destination station N/A 1 1 Receiving AP Sending AP Destination station Source station Figure Addressing mechanism: case 1 To DS =0, From DS = 0 Figure Addressing mechanism: case 2 To DS =0, From DS = 1 Figure Addressing mechanism: case 3 To DS =1, From DS = 0 Figure Addressing mechanism: case 4 To DS =1, From DS =

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