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UNITN Research Unit Status of the Work. Fabrizio Granelli DIT – University of Trento [email protected] UNITN role in the project. Goal: “ Performance Enhancement of Wireless Mesh Networks and Testbed Implementation ” WP1 WP3 T3.4 Stream Control WP4 T4.5 Network Capacity Analysis

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Unitn research unit status of the work

UNITN Research Unit Status of the Work

Fabrizio Granelli

DIT – University of Trento

[email protected]

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn role in the project
UNITN role in the project

  • Goal: “Performance Enhancement of Wireless Mesh Networks and Testbed Implementation”

  • WP1

  • WP3

    • T3.4 Stream Control

  • WP4

    • T4.5 Network Capacity Analysis

  • WP5 (Resp.)

    • T5.6 (Testbed) (Resp.)

    • T5.7 (Trials) (Resp.)

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn activities phase i
UNITN activities (Phase I)

  • T1.1 “User and Application Requirements”

  • T1.2 “WOMEN System Definition”

  • T1.3 “WOMEN System Refinement”

  • T3.4 “Stream Control” (M3-M6)

    • TCP Performance on Heterogeneous Networks

    • Cross-layering Design for Improving Network Performance

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Tcp performance enhancement tcp logwestwood
TCP Performance Enhancement:TCP LogWestwood+

  • Design Objectives

    • To be more aggressive than Standard TCP to guarantee equal or better throughput and utilization

    • Fast increase for low window values while accurately approach the available pipe capacity

    • Small sensitivity with respect to RTT

  • TCP LogWestwood+ combines smart TCP Westwood window decrease with Logarithmic increase function

Ref.: D. Kliazovich, F. Granelli, and D. Miorandi, "TCP Westwood+ Enhancements for High-Speed Long-Distance Networks,“ ICC'06.

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Tcp logwestwood

Window Control during congestion avoidance

Wmax – window size before the last packet loss occurred

TCP LogWestwood+

Logarithmic

Linear AIMD

(Standard TCP)

On packet loss (3 dup ACKs)

 =  * 2, if W < Wmax

 =  / 2, if W ≥ Wmax

 ≥ 2 (initial value)

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Tcp logwestwood performance

Window Evolution

TCP LogWestwood+:Performance

Total Capacity (+Buffers)

Physical Capacity

Total Capacity

2

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Tcp logwestwood performance1

Error-prone Bottleneck link

TCP LogWestwood+:Performance

  • Single-flow

  • Multi-flow

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Quantifying cross layer design
Quantifying Cross-layer Design

  • Quantifying the effect of potential cross-layer interactions is very important

    • to systematically relate such interactions to system outcomes

    • to quantify the decision to take such interactions into account

  • We propose to quantify cross layer interactions by defining factors (parameters) and effects (measurements) across layers

    • in a way that is common in system science and operations research

Ref.: F. Granelli, M. Devetsikiotis, “Designing Cross-Layering Solutions for Wireless Networks: a General Framework and Its Application to a Voice-over-WiFi Scenario,” CAMAD 2006.

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Quantifying cross layer design1
Quantifying Cross-layer Design

  • Cross-Layer Sensitivity and Performance Optimization

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn create net testbed
UNITN / CREATE-NET testbed

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn create net testbed1

IPv4

IPv6

IPX

Mesh connectivity Layer with LQSR

Ethernet

802.11

802.16

UNITN / CREATE-NET testbed

  • preWiMAX link (Alvarion BreezeAccess)

    • IEEE 802.11a PHY

    • Currently operative

  • Finished testing MSR MCL software (lab)

  • Decided to start from RoofNet

    • Open source

    • More documentation

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Roofnet
RoofNet

Main Features:

  • Wireless Mesh Networking SW developed by MIT (based on Click Modular Router architecture)

  • Multi-hop transmission

  • Optimized routing using a specific metric

    Limitations:

  • Need for WiFi cards with Atheros chipset

  • Madwifi driver

    Goal:

  • To port RoofNet to any hw/sw platform

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Roofnet1
RoofNet

Why dedicated HW?

  • Probe transmission for link quality measurements in broadcast mode at arbitrary rate

  • BSSID partitioning

  • Routing metric is calculated by ETT

    ETT = ETX * S/B

    (S=data size, B=used bandwidth)

    Problem:

  • IEEE 802.11 does not enable arbitrary rate in broadcast signalling

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Packet preamble
Packet preamble

Roofnet strategy:

  • Monitor mode (not IEEE 802.11 standard)

  • MadWiFi driver for “raw” 802.11 frames and to control preamble information

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Preamble management in click
Preamble management in Click

Click modules:

  • Read RSSI, noise, bitrate, etc. from incoming packet

  • Translate ingoing IEEE 802.11 packet into a Ethernet frame

  • Set rate and transmission power of the outgoing packet

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Roofnet modifications
Roofnet Modifications

  • Change from monitor mode to ad-hoc mode (supported by any IEEE 802.11 NIC)

  • Introduction of an element for static setting of preamble parameters

  • link-quality evaluation using ETX

“BlankDecap” module settings

flags = 0;

power = 60;

rssi = 8;

rate = 2;

retries = 0;

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Open issues
Open Issues

  • It is not possible to send probes in broadcast mode at arbitrary rates  maybe unicast?

  • We changed link quality evaluation from ETT to ETX model

  • Problem with chipsets non allowing MTUs > 1500 bytes (e.g. Intel Centrino)

  • Installation to Linux-enabled APs

  • To make Roofnet patch available on the web

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Dissemination activities project
Dissemination activities - Project

  • 11th Intenational Workshop on Computer-Aided Modeling, Analysis and Design of Communication Links and Networks (CAMAD 2006, Trento, June 8-9, 2006)

    • WOMEN leaflet

    • CAMAD’06 website, dinner ticket

    • Contribution to organization

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Dissemination activities papers
Dissemination activities - Papers

  • D. Kliazovich, F. Granelli, G. Pau, and M. Gerla"APOHN: Subnetwork Layering to Improve TCP Performance over Heterogeneous Paths,“IEEE Next Generation Internet Design and Engineering (NGI), Valencia, Spain, April 2006.

  • D. Kliazovich, F. Granelli, and D. Miorandi"TCP Westwood+ Enhancements for High-Speed Long-Distance Networks,“IEEE International Conference on Communications (ICC'06), Istanbul, Turkey, June 2006.

  • F. Granelli, M. Devetsikiotis“Designing Cross-Layering Solutions for Wireless Networks: a General Framework and Its Application to a Voice-over-WiFi Scenario,”

    CAMAD 2006, June 8-9, 2006, pp. 1-7.

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn estimated budget
UNITN estimated budget

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn consumed budget
UNITN consumed budget

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn research unit future activities

UNITN Research UnitFuture Activities

Fabrizio Granelli

DIT – University of Trento

[email protected]

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Activities in the next period
Activities in the next period

  • WMesh capacity evaluation

    • Analytical + simulation

  • Finalize SW package for Roofnet porting

  • Start SW installation of mesh-enabled IEEE 802.11 APs

  • Start planning the physical deployment of the network

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


Unitn available budget
UNITN available budget

“WOMEN” Project Meeting

Rome, Sept. 8th, 2006


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