Enhancement for AV Transmission July 2001 doc.: IEEE 802.11-01/399r0 July 2001 Enhancement for AV Transmission Lim Wei Lih, Yasuo HARADA, Shinichiro OHMI, Tan Pek Yew (Matsushita Electric Ind.) Lim Wei Lih, Matsushita Electric Ind. Wei Lih Lim, Matsushita Electric Ind.

Outline TXOP Improvement QoS Registration July 2001 doc.: IEEE 802.11-01/399r0 July 2001 Outline TXOP Improvement QoS Registration Delay-ACK Duplication History Lim Wei Lih, Matsushita Electric Ind. Wei Lih Lim, Matsushita Electric Ind.

July 2001 TXOP Improvement Lim Wei Lih, Matsushita Electric Ind.

TXOP Improvement Objectives Means High efficiency July 2001 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. Lim Wei Lih, Matsushita Electric Ind.

TXOP Improvement Scheme July 2001 doc.: IEEE 802.11-01/399r0 July 2001 TXOP Improvement Scheme Data Domain SIFS Polling DIFS QoS Data Initial TXOP1 (for Data) Next TXOP Shortened TXOP1 Realisation of 24Mbps over PHY 36mbps Efficiency Lim Wei Lih, Matsushita Electric Ind. Wei Lih Lim, Matsushita Electric Ind.

July 2001 QoS Registration Lim Wei Lih, Matsushita Electric Ind.

QoS Registration 2-phase TXOP allocations in HCF July 2001 doc.: IEEE 802.11-01/399r0 July 2001 QoS Registration 2-phase TXOP allocations in HCF TXOP with Registrations TXOP allocations w/o Registrations In order to achieve the requirement and throughput stated in the previous slides, we are suggesting a 2-phase TXOP allocations in HCF Phase1 is TXOP allocation for traffic/station with registrations Phase2 is TXOP allocation for traffic/station without registrations Lim Wei Lih, Matsushita Electric Ind. Wei Lih Lim, Matsushita Electric Ind.

Allocation Structure July 2001 doc.: IEEE 802.11-01/399r0 July 2001 Repeat k times Repeat j times 0..1 time Repeat i times 0..1 time 0..1 time Beacon Beacon QoS Request Registration QoS TXOP Allocation TXOP Allocation PIFS PIFS PIFS PIFS TBTT TBTT DIFS Phase 2 : TXOP w/o Registration Phase 1 : TXOP with Registration Contention Base 2-Phase TXOP allocation is to be facilitated during CFP It can have multiple iteration during a CFP and at each iteration it can contain multiple iteration of QoS TXOP allocation and TXOP allocation Contention Free Period Lim Wei Lih, Matsushita Electric Ind. Wei Lih Lim, Matsushita Electric Ind.

Phase 1 TXOP with Registration Registration QoS TXOP Allocation July 2001 Phase 1 TXOP with Registration Registration Using Controlled Contention for ESTN to indicate intention Protect Registration Information frame by granting TXOP QoS TXOP Allocation Only for ESTA with successful QoS Registration Allocating TXOPs by using polling (CF-Poll/CF-Multipoll) QoS registration given EAP/HC knowledge of QoS requests – better and more efficient scheduling Lim Wei Lih, Matsushita Electric Ind.

Phase 1 – QoS Request Registration July 2001 Phase 1 – QoS Request Registration CC (Initialization) PIFS (QoS Request frames) Station 2 TXOP For SIFS Station 4 RR CC (Feedback) EAP/HC Poll Stn 2 Station 8 Acknowledgement EAP/HC Poll Stn 4 EAP/HC Poll Stn 8 QoS Request Registration Illustration Lim Wei Lih, Matsushita Electric Ind.

Phase 1 – QoS TXOP Allocation July 2001 Phase 1 – QoS TXOP Allocation Station 2 TXOP For SIFS Station 4 EAP/HC Poll Stn 2 Station 8 PIFS EAP/HC Poll Stn 4 EAP/HC Poll Stn 8 QoS TXOP Allocation Illustration Lim Wei Lih, Matsushita Electric Ind.

Phase 2 TXOP w/o Registration Perform Polling based on July 2001 Phase 2 TXOP w/o Registration Perform Polling based on Error Statistics information element QoS Control field QoS data frame Null QoS data frame Own queues status RR frames Reservation Request Policy Performing Controlled contention Giving ESTA chances to indicate request Lim Wei Lih, Matsushita Electric Ind.

Delay-ACK Duplication History July 2001 Delay-ACK Duplication History Lim Wei Lih, Matsushita Electric Ind.

Delay-ACK with Duplicated history July 2001 doc.: IEEE 802.11-01/399r0 July 2001 Delay-ACK with Duplicated history Loss of information from a Delay-ACK can be recovered from next coming Delay-ACK Then we will talk about Delay-Ack with duplication history in order to recover the loss of previous delay-ack information due to error Then follow by improvement of TXOP Lim Wei Lih, Matsushita Electric Ind. Wei Lih Lim, Matsushita Electric Ind.

July 2001 Duplication History Lim Wei Lih, Matsushita Electric Ind.