Design and performance analysis of the Real-Time HCCA

scheduler for IEEE 802.11e WLANs

Claudio Cicconetti *, Luciano Lenzini, Enzo Mingozzi, Giovanni Stea

Dipartimento di Ingegneria dell’Informazione, University of Pisa, Pisa, ItalyAvailable online 6 February 2007

Advisor : Chao-Lieh Chen professorSpeaker : Chun-Ruei Chang

Abstract

Real-Time scheduling

Outline

1. Introduction2. IEEE 802.11e and QoS support3. Real-Time HCCA (RTH) scheduler4. Performance evaluation5. Conclusions

1. Introduction2. IEEE 802.11e and QoS support3. Real-Time HCCA (RTH) scheduler4. Performance evaluation5. Conclusions

Introduction

IEEE 802.11e MAC Protocol

TBTT TBTT

TX1 TX2 TX3 EDCA TX1 TX2 EDCA TX1 TX2 EDCA TX1 TX2 TX3TX3 TX3B EDCA

Polling throughHCF

Controlled AccessPhase

Contention Perild

802.11e beacon interval (superframe)

Service Interval 1 Service Interval 2 Service Interval 3 Service Interval 4

Polled - TXOP ECDA –TXOP

ECDA –TXOP

Polled - TXOP

QoS CF-poll CF-End QoS CF-poll

B：Beacon TX：Polled-TXOP

HCCA

RTH

offline

online

(complex computation)

(As simple as possible)

In RTH, offline activities and online activities

1. Introduction2. IEEE 802.11e and QoS support3. Real-Time HCCA (RTH) scheduler4. Performance evaluation5. Conclusions

IEEE 802.11e MAC protocol

Sample HCCA frame exchange sequence

1. Introduction2. IEEE 802.11e and QoS support3. Real-Time HCCA (RTH) scheduler4. Performance evaluation5. Conclusions

3.1. Enforcement procedure(online)3.2. Admission control(offline)3.3. Timetable computation(offline)

Whole unfulfilledcapacity

Expected arrival time

Calculated distance Between Ri and Rk

Updating variables

Timetable computation

1. Introduction 2. IEEE 802.11e and QoS support 3. Real-Time HCCA (RTH)

scheduler 4. Performance evaluation 5. Conclusions

Performance evaluation 4.1. System parameters and analysis tools 4.2. Traffic models and metrics 4.3. Admission control analysis

1. Introduction 2. IEEE 802.11e and QoS support 3. Real-Time HCCA (RTH)

scheduler 4. Performance evaluation 5. Conclusions

Conclusions

Reference

Wikipedia Google search engine.

schedule張君睿 林聖凱

(11/1~11/7) Dynamic txop(抓取個參數值所對應關係 )

一起整理相關資訊和報告排版

(11/8~11/14) 完成 dynamic txop scheme,Demo txop效果 ,psnr or throughput.

Demo txop效果

(11/15~11/21)

修正 demo時所產生的問題 提供相關文獻供參考

(11/22~11/28)

Project done Project done

Thanks for your attention!!!