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!!!