McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 IEEE 802.11 IEEE 802.11 Architecture Physical Layer MAC Layer Addressing Mechanism McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.1 BSSs McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.2 ESS McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.3 Physical layer specifications McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.6 MAC layers in IEEE 802.11 standard McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.8 CSMA/CA and NAV McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.9 Frame format McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Table 15.1 Subfields in FC field Table 15.1 Subfields in FC field Field Explanation Version Version The current version is 0. The current version is 0. Type Type Type of information: management (00), control (01), or data Type of information: management (00), control (01), or data (10). (10). Subtype Subtype Defines the subtype of each type (see ). Defines the subtype of each type (see ). To DS To DS Defined later. Defined later. From DS From DS Defined later. Defined later. More flag More flag When set to 1, means more fragments. When set to 1, means more fragments. Retry Retry When set to 1, means retransmitted frame. When set to 1, means retransmitted frame. Pwr mgt Pwr mgt When set to 1, means station is in power management mode. When set to 1, means station is in power management mode. More data More data When set to 1, means station has more data to send. When set to 1, means station has more data to send. WEP WEP Wired equivalent privacy. When set to 1, means encryption Wired equivalent privacy. When set to 1, means encryption implemented. implemented. Rsvd Rsvd Reserved. Reserved. McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Control Frame McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Control frames . 0. The current version is 0. Type Type Type of information: management (00), control (01), or data Type of information: management (00), control (01), or. NAV McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Figure 15.9 Frame format McGraw-Hill © The McGraw-Hill Companies, Inc., 2004 Table 15.1 Subfields