Yiannis Yiakoumis Stanford University Research Track Session Part 2 ONS2015: http://bit.ly/ons2015sd ONS Inspire! Webinars: http://bit.ly/oiw-sd Watch the talk (video) on ONS Content Archives: http://bit.ly/ons-archives-sd

3. BeHop : SDN for Dense WiFi Networks
Yiannis Yiakoumis
Manu Bansal, Sachin Katti, Johan van Reijendam, Nick McKeown
Stanford University

4. Deployment
150
(user,chaotic)
Configuration user
Access own AP
• 27M (24%) US Households in MultiUnit Structures
• ~25 neighboring AP (@ Mission SF)

5. Common wireless issues
• High interference - Congested channels
• Poor coverage – channel degradation
• Misconfiguration
• Poor channel and power allocation
Lack of co-ordination among individual home
networks

6. BeHop
Question : How should we design such dense networks?
Hypothesis : SDN-based coordination can help
Provide users with fast, reliable, and personalized
service
Goal

7. BeHop
Provide users with fast, reliable, and personalized
service
Goal
Question : How should we design such dense networks?
Hypothesis : SDN-based coordination can help

8. • Allow personalized user configuration
– name, password, policies
• Simplify and improve network management
– infrastructure visibility and control
– use global perspective
– physical infrastructure for high performance
• overprovision, better coverage, redundancy
• decouple deployment from operation

9. Deployment
150
(user,chaotic)
150
Configuration user user+infra
Access own AP infra

10. WiFi Virtualization
On a virtualized WiFi architecture
the user sees a single, personal AP that follows
him wherever he goes

11. WiFi Virtualization

12. WiFi Virtualization

13. WiFi Virtualization

14. WiFi Virtualization
• Expose Configuration for users (e.g. SSID, password, policies)
• Personalized view of the network that follows the user
• Hides wireless complexity from client
• which channel/AP to use
• when to handoff
• Allows the infrastructure to optimize based on global knowledge

15. Stanford BeHop Experiment
• Stanford’s grad housing building ( 150 studios)
• Netgear AP (OpenWrt + Openvswitch)
• SDN WiFi extensions
-> Performance
– Band Steering / Load Balancing
– Green-Field vs backward compatibility
– Mobility
– Turn-off redundant AP
-> User Policies
– Personal SSID
– Personal firewall
– Premium Video Service

16. Conclusions
• Dense WiFi networks are commonplace
• Coordination can improve user experience and performance
• WiFi Virtualization
– A personal network that follows me
– Easy to manage and control the infrastructure
• Stay tuned for results…

17. thanks
(yiannisy@stanford.edu)