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    802.11n New MAC Features
• Aggregation Format
• Aggregation Exchanges
• Header Compression
• Protection Mechanisms
Initiator Aggregate Control
Royal Automobile Club
Multiple Receiver Aggregate
         Descriptor
MAC Header MPDU
Compressed Header Data MPDU
    Multiple Receiver Aggregation

• Aggregates can contain MPDUs addressed for multiple receiver
   addresses (MRA)
• MRA may be followed by multiple responses from the multiple
   receivers
• MRA is effective in improving throughput in applications
   where frames are buffered to many receiver addresses
Multiple Responses
             Protection Mechanisms
• LongNAV
– An entire sequence is protected by NAV set using MPDU duration
   field or during contention-free period
– CF-end packet at end of EDCA TXOP sequence may be used to
   return unused time by resetting NAV
• Pairwise Spoofing
– Protection of pairs of PPDUs sent between an initiator and a single
   responder
– Uses Legacy PLCP header duration spoofing
• Single-ended Spoofing
– Protection of aggregate and any responses using legacy PLCP
   spoofing at the initiator only
– Can be used to protect multiple responses
              Channel Selection
• Support 40/20 MHz and 20 MHz operating modes of whole
   BSS
• In 40/20 MHz mode, all legacy PPDUs are 20 MHz, all HT
   PPDUs exchanged between HT STA are either 40 MHz or 20
   MHz depending on operating mode and STA capability
• Channel selection constraints
– Partial overlap between HT systems is not allowed
– Legacy STAs are only allowed in the control sub-channel
   except in 20 MHz-base managed mixed mode
• An HT AP responds to changes in environment to maintain
   channel selection constraints