July 2001 doc IEEE 802 11 01434 r

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Enhancement for AV Transmission Lim Wei Lih, Yasuo HARADA, Shinichiro OHMI, Tan Pek Yew (Matsushita Electric Ind. ) Submission 1 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Outline • TXOP Improvement • Qo. S Registration • Delay-ACK Duplication History Submission 2 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 TXOP Improvement Submission 3 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 TXOP Improvement • Objectives – High efficiency – Deliver Delay-ACK during TXOP • Means – The earlier ending of a TXOP is known by the gap. – The end of Data’s TXOP is PIFS. – The end of Delay-ACK’s TXOP is DIFS. Submission 4 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 TXOP Improvement Scheme Initial TXOP 1 (for Data) Next TXOP Polling Delay-Ack Data Domain Polling SIFS DIFS PIFS SIFS Qo. S Data Qo. S Data SIFS SIFS Submission 5 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Qo. S Registration Submission 6 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Qo. S Registration • 2 -phase TXOP allocations in HCF – TXOP with Registrations – TXOP allocations w/o Registrations Submission 7 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Allocation Structure Repeat k times Repeat j times Repeat i times 0. . 1 time Qo. S TXOP Allocation DIFS Phase 2 : TXOP w/o Registration TBTT PIFS TBTT Phase 1 : TXOP with Registration Contention Base Contention Free Period Submission Beacon Qo. S Request Registration 0. . 1 time 8 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Phase 1 • TXOP with Registration • Registration – Using Controlled Contention for ESTN to indicate intention – Protect Registration Information frame by granting TXOP • Qo. S TXOP Allocation – Only for ESTA with successful Qo. S Registration – Allocating TXOPs by using polling (CF-Poll/CF-Multipoll) – Qo. S registration given EAP/HC knowledge of Qo. S requests – better and more efficient scheduling Submission 9 Lim Wei Lih, Matsushita Electric Ind.

Acknowledgement TXOP For Station 8 (Qo. S Request frames) PIFS EAP/HC Poll Stn 8 SIFS TXOP For Station 4 (Qo. S Request frames) PIFS EAP/HC Poll Stn 4 SIFS TXOP For Station 2 (Qo. S Request frames) PIFS SIFS PIFS EAP/HC Poll Stn 2 SIFS CC (Feedback) RR RR RR CC (Initialization) Lim Wei Lih, Matsushita Electric Ind. 10 Submission doc. : IEEE 802. 11 -01/434 r 0 July 2001 Phase 1 – Qo. S Request Registration Illustration

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Phase 1 – Qo. S TXOP Allocation TXOP For Station 8 PIFS EAP/HC Poll Stn 8 SIFS TXOP For Station 4 PIFS EAP/HC Poll Stn 4 SIFS TXOP For Station 2 EAP/HC Poll Stn 2 SIFS Qo. S TXOP Allocation Illustration Submission 11 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Phase 2 • TXOP w/o Registration • Perform Polling based on – Error Statistics information element – Qo. S Control field • • Qo. S data frame Null Qo. S data frame Own queues status RR frames • Reservation Request Policy – Performing Controlled contention – Giving ESTA chances to indicate request Submission 12 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Delay-ACK Duplication History Submission 13 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Delay-ACK with Duplicated history • Loss of information from a Delay-ACK can be recovered from next coming Delay-ACK Submission 14 Lim Wei Lih, Matsushita Electric Ind.

July 2001 doc. : IEEE 802. 11 -01/434 r 0 Duplication History Submission 15 Lim Wei Lih, Matsushita Electric Ind.