Power Save Multi-Poll (PSMP)
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Power Save Multi-Poll (PSMP)

• A new power-management method, power save multi-poll (PSMP), has also been defined for use for HT (802.11n) radios.
  
• PSMP is an extension of automatic power save delivery (APSD), which was defined by the 802.11e amendment.
• The second new power-management method, Power Save Multi Poll (PSMP), has also been defined for use by 802.11n (HT) radios.
• Unscheduled PSMP is similar to U-APSD and uses the same delivery-enabled and trigger-enabled mechanisms.
  
• Scheduled PSMP is also similar to S-APSD and is an effective method for streaming data and other scheduled transmissions.
  

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Reference:
Coleman, David D.,Westcott, David A. CWNA: Certified Wireless Network Administrator Official Study Guide: Exam CWNA-106 Wiley.