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

2. Master Thesis Project - Lionel Perez – June 2005 — 2 Agenda > Abstract > Specific Tasks > Available Material > Achieved Tasks > References > Support > Related Work

3. Master Thesis Project - Lionel Perez – June 2005 — 3 Abstract > VoIP over WLANs, the « killer application » > Inexpensive and convenient mobile telephony > Good voice quality required for success > Can IEEE 802.11 WLANs provide such quality?

4. Master Thesis Project - Lionel Perez – June 2005 — 4 More parameters than wired LAN ! > Loss, Delay, Jitter > Impact of rate adaptation, power management on loss, delay, jitter > Impact of encrypction on loss, delay, jitter > Impact of RTS/CTS on loss, delay, jitter > Association performance, Authentication performance, > Roaming time, Rate adaptation time, > QoS (EDCF, WMM, WMM-SA) > Packet size

5. Master Thesis Project - Lionel Perez – June 2005 — 5 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

6. Master Thesis Project - Lionel Perez – June 2005 — 6 Proposed Tasks 1/2 > Learn about the relationship between traffic parameters (delay, jitter, packet losses) and voice quality (MOS,E- model: R-Value) > Explore different scenarios that directly impact these parameters: the QoS mechanisms implemented (802.11e)? the security features (802.11i)? 802.11a,b or g ? the codec (opt)? the signalling protocol (opt)?

7. Master Thesis Project - Lionel Perez – June 2005 — 7 Proposed Tasks 2/2 > Perform measurements of these parameters under the different possible considerations > Use the ns2 network simulator or other (OMNET++?) to model and simulate some of these configurations > Define key tests to be conducted in order to ensure a given performance

8. Master Thesis Project - Lionel Perez – June 2005 — 8 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: 2 Veriwave Tests Units Wildpacket’s Airopeek Airmagnet Laptop Ixia Ixchariot

9. Master Thesis Project - Lionel Perez – June 2005 — 9 Achieved Tasks > Bibliographical Research Complete > Read the key articles > Understand the available 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

10. Master Thesis Project - Lionel Perez – June 2005 — 10 Related Work > “Can I add a VoIP call?”, S. Garg and M. Kappes > Voice over IEEE 802.11b Capacity, Coupechoux, Kumar, Brignol (Alcatel), 2004 > Simulation of 802.11e > Basic security features (WEP) > New QoS mechanisms? > New Security mechnisms? > New Power Management mechanisms?

11. Master Thesis Project - Lionel Perez – June 2005 — 11 Support > Supervisor: Michel Mouton > Additional Support: Jean-Michel Lauriol Daniel Le Bars The WLAN team: Architecture, QoS, Security, Interoperability, OXE/OXO

12. Master Thesis Project - Lionel Perez – June 2005 — 12 Thank you.

13. Master Thesis Project - Lionel Perez – June 2005 — 13 OXE-WLAN solution UA 850000 ACS 172.25.115.226 WLAN OmniAccess SLK0 855000 172.25.114.210 9D:28 OmniSwitch Router SVP Server (with GK) 172.25.114.196 Management: Port 1 172.25.115.229 Vlan 99 Voice: Port 1 172.25.114.197 Vlan 31 Data: Port 1 172.25.114.34 Vlan 30 CS 172.25.114.194 GD 172.25.114.195 UA 850001 172.25.114.193 NAT : 172.25.114.210-.219 172.25.114.220-.229 SLK1 855001 172.25.114.211 9E:69 SLK2 855002 172.25.114.212 BE:01 IP 853000 172.25.114.230 IP 853001 172.25.114.231 SLK3 855003 172.25.114.213 DD:30 172.25.114.33 Vlan Voice: 172.25.114.192 255.255.255.192 Vlan Data: 172.25.114.32 255.255.255.240 Vlan Management: 172.25.115.229 255.255.255.240 172.25.115.225 Laptop 172.25.114.35 Radius, TFTP 172.25.115.232 OXE