doc.: IEEE /0342r0 SubmissionLiwen Chu Etc.Slide 1 Power Efficient PS Poll Date: Authors: Date: March, 2012

doc.: IEEE /0342r0 Submission PS Poll Procedure Once a power save STA sends PS Poll, it needs to keep awake until the next beacon or data frame from the AP. –This increases power consumption of a low power STA. Slide 2 Beacon PS Poll ACK BU=1 Data Awake TimeDoze Date: March, 2012 Beacon PS Poll ACK BU=1 Data Awake TimeDoze

doc.: IEEE /0342r0 Submission TXOP Power Save in ac An AP may indicate support TXOP power save and if it allows to use TXOP power save in a specific TXOP. A TXOP Power Save STA may go to doze state if the AP allows to use TXOP power save in a specific TXOP and a PPDU is not for it. Slide 3 Date: March, 2012

doc.: IEEE /0342r0 Submission Power Save PS Poll A Low Power STA is introduced. An AP can indicate if it supports low power STA. If it support low power STA, it shall allow TXOP power save in all TXOPs during a period after at least a PS Poll is received and before it sends buffered data frame to all Low Power STAs from which it receives Ps Poll from. After a STA sends PS Poll, if the first PPDU does not include MPDU for it in a TXOP, a STA that announces being a Low Power STA can go to doze in the TXOP. Slide 4 Date: March, 2012

doc.: IEEE /0342r0 Submission Reference [1] IEEE P802.11ac™/D2.0 Draft STANDARD for Information Technology— Telecommunications and information exchange between systems— Local and metropolitan area networks— Specific requirements Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications Amendment 4: Enhancements for Very High Throughput for Operation in Bands below 6 GHz Slide 5 Date: March, 2012