1. Enhancement for AV Transmission
July 2001
doc.: IEEE /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.

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

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

4. 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.

5. TXOP Improvement Scheme
July 2001
doc.: IEEE /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.

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

7. QoS Registration 2-phase TXOP allocations in HCF
July 2001
doc.: IEEE /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.

8. 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.

9. 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.

10. 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.

11. 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.

12. 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.

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

14. Delay-ACK with Duplicated history
July 2001
doc.: IEEE /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.

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