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Performance Characterization of Voice over Wireless LANs

Performance Characterization of Voice over Wireless LANs. Lionel PEREZ June 2nd, 2005. Agenda. Abstract Specific Tasks Available Material Achieved Tasks References Support Related Work. Abstract. VoIP over WLANs, the « killer application » Inexpensive and convenient mobile telephony

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Performance Characterization of Voice over Wireless LANs

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

  2. Agenda • Abstract • Specific Tasks • Available Material • Achieved Tasks • References • Support • Related Work

  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. 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. 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. 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. 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. 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. 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. 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. Support • Supervisor: • Michel Mouton • Additional Support: • Jean-Michel Lauriol • Daniel Le Bars • The WLAN team: Architecture, QoS, Security, Interoperability, OXE/OXO

  12. Thank you.

  13. Vlan Voice: 172.25.114.192 255.255.255.192 Vlan Data: 172.25.114.32 255.255.255.240 NAT : 172.25.114.210-.219 172.25.114.220-.229 Vlan Management: 172.25.115.229 255.255.255.240 OXE-WLAN solution SLK0 855000 172.25.114.210 9D:28 SLK1 855001 172.25.114.211 9E:69 Radius, TFTP 172.25.115.232 172.25.114.33 172.25.115.225 SLK2 855002 172.25.114.212 BE:01 172.25.114.193 SLK3 855003 172.25.114.213 DD:30 OmniSwitch Router ACS 172.25.115.226 Laptop 172.25.114.35 WLAN OmniAccess OXE IP 853000 172.25.114.230 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 IP 853001 172.25.114.231 UA 850000 SVP Server (with GK) 172.25.114.196 UA 850001

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