xvi Copyright © 2007 IEEE. All rights reserved.
9.2.3.2 PIFS ..................................................................................................... 259
9.2.3.3 DIFS..................................................................................................... 259
9.2.3.4 AIFS..................................................................................................... 259
9.2.3.5 EIFS ..................................................................................................... 259
9.2.4 Random backoff time............................................................................................. 260
9.2.5 DCF access procedure ........................................................................................... 261
9.2.5.1 Basic access ......................................................................................... 261
9.2.5.2 Backoff procedure for DCF ................................................................. 262
9.2.5.3 Recovery procedures and retransmit limits ......................................... 263
9.2.5.4 Setting and resetting the NAV ............................................................. 264
9.2.5.5 Control of the channel.......................................................................... 264
9.2.5.6 RTS/CTS usage with fragmentation .................................................... 266
9.2.5.7 CTS procedure ..................................................................................... 267
9.2.6 Individually addressed MPDU transfer procedure ................................................ 267
9.2.7 Broadcast and multicast MPDU transfer procedure .............................................. 268
9.2.8 ACK procedure ...................................................................................................... 268
9.2.9 Duplicate detection and recovery .......................................................................... 269
9.2.10 DCF timing relations ............................................................................................. 270
9.2.11 NAV distribution ................................................................................................... 271
9.2.12 Determination of PLME aCWmin characteristics ................................................. 271
9.3 PCF........................................................................................................................................ 271
9.3.1 CFP structure and timing ....................................................................................... 272
9.3.2 PCF access procedure ............................................................................................ 274
9.3.2.1 Fundamental access ............................................................................. 274
9.3.2.2 NAV operation during the CFP ........................................................... 274
9.3.3 PCF transfer procedure .......................................................................................... 275
9.3.3.1 PCF transfers when the PC STA is transmitter or recipient ................ 275
9.3.3.2 Operation with overlapping point-coordinated BSSs .......................... 277
9.3.3.3 CFPMaxDuration limit ........................................................................ 277
9.3.3.4 CF usage rules...................................................................................... 277
9.3.4 CF polling list ........................................................................................................ 278
9.3.4.1 Polling list processing.......................................................................... 278
9.3.4.2 Polling list update procedure ............................................................... 278
9.4 Fragmentation ....................................................................................................................... 279
9.5 Defragmentation.................................................................................................................... 279
9.6 Multirate support................................................................................................................... 280
9.6.1 Modulation classes................................................................................................. 281
9.7 MSDU transmission restrictions ........................................................................................... 282
9.8 Operation across regulatory domains.................................................................................... 282
9.8.1 Operation upon entering a regulatory domain ....................................................... 283
9.8.2 Support for FH PHYs ............................................................................................ 283
9.8.2.1 Determination of hopping patterns ...................................................... 283
9.9 HCF....................................................................................................................................... 286
9.9.1 HCF contention-based channel access (EDCA) .................................................... 286
9.9.1.1 Reference implementation ................................................................... 286
9.9.1.2 EDCA TXOPs...................................................................................... 287
9.9.1.3 Obtaining an EDCA TXOP ................................................................. 287
9.9.1.4 Multiple frame transmission in an EDCA TXOP................................ 289
9.9.1.5 EDCA backoff procedure .................................................................... 290
9.9.1.6 Retransmit procedures ......................................................................... 291
9.9.2 HCCA .................................................................................................................... 292
9.9.2.1 HCCA procedure ................................................................................. 292
9.9.2.2
TXOP structure and timing.................................................................. 295
9.9.2.3 HCCA transfer rules ............................................................................ 296
This is a copyrighted IEEE Standard. For personal or standards development use only.