resolution for cid 118 and 664 n.
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Resolution for CID 118 and 664. Date: 2011-05-11. Authors:. Slide 1. Comment 118 and 664 related to TXOP PS. Proposed Text change from 593 r5. 11.2.1.4a Power management during VHT transmissions

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resolution for cid 118 and 664
Resolution for CID 118 and 664

Date: 2011-05-11

Authors:

Slide 1

proposed text change from 593 r5
Proposed Text change from 593 r5

11.2.1.4a Power management during VHT transmissions

The power management scheme described in this section is applicable only when the dot11VHTTXOPPowerSave is true at VHT AP. The non-AP VHT STAs that are in Active mode (see Table 11-1—Power Management modes) and have dot11TXOPPowerSave set to true operate in TXOP power save mode. A VHT AP may or may not allow non-AP VHT STAs in TXOP power save mode to enter the Doze state during a TXOP. A VHT AP shall indicate this using TXOP_PS_NOT_ALLOWED parameter in TXVECTOR of a frame with FORMAT VHT..The value of this parameter in the TXVECTOR of all VHT PPDUs transmitted by VHT AP shall remain same for the duration of TXOP. The value of this parameter in the TXVECTOR of all VHT PPDUs transmitted by VHT AP may be changed from 1 to 0 during the TXOP to enable TXOP PS for the remainder of the TXOP. The value of this parameter in the TXVECTOR of all VHT PPDUstransmitted by VHT AP shall not be changed from 0 to 1 during the TXOP.

discussions
Discussions
  • For CID 118: If during one TXOP, AP has packets to transmit to multiple STAs or multiple groups of STAs that operate in TXOP power save mode, TXOP PS can not be applied to the whole TXOP. For example, if STA1, STA2 both operates in TXOP power save mode and TXOP PS is allowed then STA2 will go to DOZE state till the end of TXOP when it receives the first packet the AP transmits to STA1. The solution is to allow the AP to change the TXOP_PS_NOT_ALLOWED bit to 0 as illustrated in the following figure:
  • For CID 664: The text change states that the TXOP_PS_NOT_ALLOWED bit can only change one time from 1 to 0 during a TXOP but can not change from 0 to 1. This is the clarification on how often this field can be changed.

TXOP End

TXOP Start

STA1 or STA Group1

STA2 or STA Group 2

Set TXOP_PS_NOT_ALLOWED = 0 here

Set TXOP_PS_NOT_ALLOWED = 1

at the beginning of a TXOP

All other STAs operating in TXOP

PS mode goes to DOZE state

No STA goes to DOZE state