1. Performance Characterization of Voice over Wireless LANs
Lionel PEREZ
June 2nd, 2005

2. Agenda Abstract Specific Tasks Available Material Achieved Tasks
References
Support
Previous Tasks

3. Abstract Purposes of the project:
Characterize the performance of a telephony solution based on Voice over IP over Wireless LANs (VoWLAN)
Conduct measurements and simulation to identify the most significant parameters impacting voice quality
Market and Strategy requirements:
Avoid time and cost-intensive tests
Independence from OEMs

4. Proposed Tasks 1/2
Learn about the relationship between traffic parameters (delay, jitter, packet losses) and voice quality (E-model, R-Value, MOS)
Identify the infrastructure and configuration choices that directly impact on these parameters
Perform measurements of these parameters under the different possible considerations
Define key tests to be conducted in order to ensure a given performance

5. Proposed Tasks 2/2 Consider the different possible configurations:
802.11a,b or g ?
the QoS mechanisms implemented (802.11e)?
the security features (802.11i)?
The codec (opt)?
the signalling protocol (opt)?
Use the ns2 network simulator or other (OPNET++) to model and simulate some of these configurations

6. Available Material
The « alpha test »: the VoWLAN solution deployed in our premises
The «platform» (testing lab)
PCs and laptops equiped with NICs
Wireless Switches, Access Points, Wifi phones
Professional measurement tools:
Veriwave Tests Units
Wildpacket’s Airopeek
Ixia Ixchariot
Airmagnet Laptop

7. Achieved Tasks Bibliographical Research Complete
Understand the availabble tools
Discover NS2
During the internship:
Discover Alcatel’s VoWLAN Solution
Evaluate Sigmum Wiplan (Planning Software)
Conduct Site Surveys
Basic mock-up configuration
The VoWLAN toolkit

8. Related Work “Can I add a VoIP call?”, S. Garg and M. Kappes
Voice over IEEE b Capacity, Coupechoux, Kumar, Brignol (Alcatel), 2004
Assessing Voice Quality in Packet-Based Telephony, Danny De Vleeschauwer (Alcatel), 2002
The E-Model:

9. Support General Advisor: Michel Mouton Additional Support:
Jean-Michel Lauriol (WLAN Architecture)
Daniel Le Bars (Validation and Interoperability)
Emmanuel Hiegel (Alcatel Equipment)
Anne-Laure Selignan: QoS
Sophie Wernert: Security
Marceau Coupechoux: NS2
Danny De Vleeschauwer: VoIP

10. Thank you.