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详细说明： wifi 802.11n 协议标准 Contents 2. Normative references ........................................................................................................................... 1 3. Definitions ........................................................................................................................................... 2 3A. Definitions specific to IEEE 802.11 .................................................................................................... 3 4. Abbreviations and acronyms .......................... ..................................................................................... 8 5. General description ............................................................................................................................ 10 5.2 Components of the IEEE 802.11 architecture ....................................................................... 10 5.2.9 High-throughput (HT) station (STA)..................................................................... 10 6. MAC service definition ..................................................................................................................... 10 6.1 Overview of MAC services ................................................................................................... 10 6.1.5 MAC data service architecture .............................................................................. 10 7. Frame formats .................................................................................................................................... 12 7.1 MAC frame formats............................................................................................................... 12 7.1.1 Conventions ........................................................................................................... 12 7.1.2 General frame format............................................................................................. 12 7.1.3 Frame fields ........................................................................................................... 13 7.1.3.1 Frame Control field............................................................................ 13 7.1.3.1.2 Type and Subtype fields ............................................ 13 7.1.3.1.6 Power Management field ........................................... 13 7.1.3.1.7 More Data field.......................................................... 13 7.1.3.1.9 Order field.................................................................. 14 7.1.3.2 Duration/ID field................................................................................ 14 7.1.3.3 Address fields .................................................................................... 14 7.1.3.3.3 BSSID (BSS identification) field............................... 14 7.1.3.3.4 DA (destination address) field ................................... 14 7.1.3.3.5 SA (source address) field........................................... 14 7.1.3.4 Sequence Control field....................................................................... 15 7.1.3.4.1 Sequence Number field.............................................. 15 7.1.3.4.2 Fragment Number field.............................................. 15 7.1.3.5 QoS Control field............................................................................... 15 7.1.3.5.1 TID subfield............................................................... 16 7.1.3.5.3 Ack Policy subfield.................................................... 17 7.1.3.5.5 Queue Size subfield ................................................... 18 7.1.3.5.6 TXOP Duration Requested subfield .......................... 18 7.1.3.5.7 AP PS Buffer State subfield....................................... 18 7.1.3.5.8 A-MSDU Present subfield ......................................... 18 7.1.3.5a HT Control field................................................................................. 18 7.1.3.6 Frame Body field ............................................................................... 23 7.1.4 Duration/ID field (QoS STA)in data and management frames ............................. 23 7.1.4.1 General............................................................................................... 23 7.1.4.2 Setting for single and multiple protection under enhanced distributed channel access (EDCA) ................................................... 23 7.1.4.3 Setting for QoS CF-Poll frames......................................................... 24 7.1.4.4 Setting for frames sent by a TXOP holder under HCCA .................. 25 ...展开收缩
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