Virtualized Wireless Infrastructure Sachin Katti Assistant Professor, EE & CS Stanford University

What does it take to….. 2 Open the wireless infrastructure so users can choose any free spectrum, any network, or many networks, any time?

3 AT&T 3G Sprint WiMAX Any network….

4 AT&T 3G Sprint WiMAX Many networks….

What does it take to give users choice? 5

Wish List 1.Instantaneous contracts with any physical network, independent of its owner or radio technology 2.A network-independent way to choose a network, and to control mobility 6

Design Choice 1.Establish my own instantaneous contracts and control the network (hard), or 1.Delegate to an entity in the infrastructure – A service provider – My own agent Conceptually the same; we start by delegating 7

Requirement Technical – Radio-independent control layer – A method for a service provider to control my flows on my behalf Business – An incentive for infrastructure owners to open access to service providers 8

Network OS “Slicing” Layer Network OS Feature Billing, Mobility New Service Billing, Mobility New Service “AT&T” New Service “Vodafone” Billing, Mobility New Service Billing, Mobility New Service Feature OpenFlow Switch OpenFlow Switch OpenFlow Switch OpenFlow AP OpenFlow BS

Consequences Radio-independent control layer – Service provider controls user flows – Easy handover between physical networks – Can use several networks simultaneously – Service innovation by service providers A method to share the physical infrastructure – Isolation between service providers – Short-term or long-term lease of rights-of-way 10

11 Radio Network: Spectrum, Radios Network Layer: Wireline Network Service Layer: Authentication, Billing, Mobility Management, Routing, … AT&T

Separating the service from the network 12 Radio Network: Spectrum, Radios Network Layer: Wireline Network Service Layer: Authentication, Billing, Mobility Management, Routing, … Separation/Virtualization

Service provider controls a slice across physical networks 13 Separation/Virtualization Service Network Service Network Radio Network: Spectrum, Radios “AT&T”