Enhancement for av transmission
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Enhancement for AV Transmission. Lim Wei Lih, Yasuo HARADA , Shinichiro OHMI , Tan Pek Yew (Matsushita Electric Ind.). Outline. TXOP Improvement QoS Registration Delay-ACK Duplication History. TXOP Improvement. TXOP Improvement. Objectives High efficiency

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Enhancement for AV Transmission

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Enhancement for av transmission

Enhancement for AV Transmission

Lim Wei Lih, Yasuo HARADA,

Shinichiro OHMI, Tan Pek Yew

(Matsushita Electric Ind.)

Lim Wei Lih, Matsushita Electric Ind.


Outline

Outline

  • TXOP Improvement

  • QoS Registration

  • Delay-ACK Duplication History

Lim Wei Lih, Matsushita Electric Ind.


Txop improvement

TXOP Improvement

Lim Wei Lih, Matsushita Electric Ind.


Txop improvement1

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

Initial TXOP1 (for Data)

Shortened TXOP1

Next TXOP

Data Domain

Data Domain

QoS Data

Polling

QoS Data

QoS Data

Polling

QoS Data

QoS Data

QoS Data

QoS Data

SIFS

DIFS

SIFS

SIFS

SIFS

SIFS

SIFS

SIFS

SIFS

TXOP Improvement Scheme

Lim Wei Lih, Matsushita Electric Ind.


Qos registration

QoS Registration

Lim Wei Lih, Matsushita Electric Ind.


Qos registration1

QoS Registration

  • 2-phase TXOP allocations in HCF

    • TXOP with Registrations

    • TXOP allocations w/o Registrations

Lim Wei Lih, Matsushita Electric Ind.


Allocation structure

Beacon

Beacon

Allocation Structure

Repeat k times

Repeat j times

0..1 time

Repeat i times

0..1 time

0..1 time

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

Contention Free Period

Lim Wei Lih, Matsushita Electric Ind.


Phase 1

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

TXOP

For

Station 4

(QoS Request

frames)

TXOP

For

Station 8

(QoS Request

frames)

TXOP

For

Station 2

(QoS Request

frames)

Acknowledgement

EAP/HC Poll Stn 2

CC (Feedback)

EAP/HC Poll Stn 8

RR

RR

RR

CC (Initialization)

EAP/HC Poll Stn 4

PIFS

SIFS

PIFS

PIFS

SIFS

PIFS

SIFS

PIFS

SIFS

PIFS

Phase 1 – QoS Request Registration

QoS Request Registration Illustration

Lim Wei Lih, Matsushita Electric Ind.


Phase 1 qos txop allocation

TXOP

For

Station 4

TXOP

For

Station 8

TXOP

For

Station 2

EAP/HC Poll Stn 2

EAP/HC Poll Stn 4

EAP/HC Poll Stn 8

SIFS

PIFS

SIFS

PIFS

SIFS

Phase 1 – QoS TXOP Allocation

QoS TXOP Allocation Illustration

Lim Wei Lih, Matsushita Electric Ind.


Phase 2

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

Delay-ACK Duplication History

Lim Wei Lih, Matsushita Electric Ind.


Delay ack with duplicated history

Delay-ACK with Duplicated history

  • Loss of information from a Delay-ACK can be recovered from next coming Delay-ACK

Lim Wei Lih, Matsushita Electric Ind.


Duplication history

Duplication History

Lim Wei Lih, Matsushita Electric Ind.


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