March 2008 doc IEEE 802 11 080070 r

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March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Peer Power Save Mode

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Peer Power Save Mode Date: 2008 -03 -17 Authors: Submission 1 Alexander Safonov, IITP RAS

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 PSM in 802. 11

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 PSM in 802. 11 z-D 0. 02 (1/2) • TDLS Rx Path Switch Request/Response Path Element (AP Path Switch) Encapsulated DATA frame (TDLS Rx Path Switch Request) AP Path Element (AP Path Switch) 1 2 QSTA 1 changes to Power Saving Mode 3 QSTA 2 QSTA 1 Submission Encapsulated DATA frame (TDLS Rx Path Switch Response) 2 Alexander Safonov, IITP RAS

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 PSM in 802. 11

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 PSM in 802. 11 z-D 0. 02 (2/2) • Legacy PSM • In PSM, AP path is used, but not direct path TIM element AP 3 DATA frame PS-poll 4 1 DATA frame 5 QSTA 1 in PSM QSTA 2 2 QSTA 1 awakes Submission 3 Alexander Safonov, IITP RAS

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Legacy PSM vs. Peer

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Legacy PSM vs. Peer PSM • Legacy PSM • In PSM, the AP path is still used – thus two successful transmissions of a long data packet are needed to deliver the packet from peer to peer • Data is buffered at the AP which becomes a bottleneck • No Qo. S differentiation because of the legacy AP • Proposed Peer PSM • Peers enter PSM remaining on the direct path • Data is buffered at the originator QSTA, but not at the legacy AP – Qo. S differentiation • Peers use the concept of Service Period to deliver data directly, but not over the AP – Using full potential of the direct path • A Service Period may be initiated at arbitrary time or after a beacon by using Peer Traffic Indication frame Submission 4 Alexander Safonov, IITP RAS

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Peer PSM (1/2) –

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Peer PSM (1/2) – The case when QSTA 2 is in Active mode • Power Management bit controls the state in Peer PSM • Service Period is triggered to retrieve buffered data from peer • QSTA 2 may inform QSTA 1 about buffered data by sending Peer Traffic Indication over the AP AP QSTA 1 changes to Power Saving Mode 6 QSTA 1 changes to Power Saving Mode Null DATA frame 2 (Power Management Field is set to 0) 4 QSTA 1 in 5 Peer PSM Buffered DATA frame (EOSP is set to 1) 3 QSTA 1 wakes up 1 Submission QSTA 2 in Active Mode A frame with Power Management bit set to 1 5 Alexander Safonov, IITP RAS

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Peer PSM (2/2) –

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Peer PSM (2/2) – The case when both QSTA 1 and QSTA 2 are in Peer PSM • Power Management bit controls the state in Peer PSM • Service Period is triggered to retrieve buffered data from peer • A QSTA may inform the peer QSTA about buffered data by sending Peer Traffic Indication over the AP AP 1 QSTA 1 changes to Doze state 6 QSTA 1 in Peer PSM Submission 4 Encapsulated DATA frame (Peer Traffic Indication) A frame with Power Management bit set to 1 Null DATA frame (Power Management Field is set to 0) 5 Buffered DATA frame (EOSP is set to 1) 6 QSTA 2 changes to Power Saving Mode 2 4 QSTA 2 3 QSTA 2 wakes up Alexander Safonov, IITP RAS

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Motion • Move to

March 2008 doc. : IEEE 802. 11 -08/0070 r 1 Motion • Move to include the normative text in document 11 -080071 -03 -000 z-normative-text-peer-power-save-mode. doc into the current TGz draft • Mover: Seconder: Result: Submission 7 Alexander Safonov, IITP RAS