Overcoming the Challenges of Wireless in the Classroom Patrick Bristow Software Engineer, ConferenceXP External Research & Programs, Microsoft Research.

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Presentation transcript:

Overcoming the Challenges of Wireless in the Classroom Patrick Bristow Software Engineer, ConferenceXP External Research & Programs, Microsoft Research Thursday, July 21 th, 2005 Tablet PC Workshop

Outline What is multicast? Why use multicast over wireless? Great! What’s the problem? So what do we do?

What Is Multicast? Multicast is a type of traffic destined to a group of users (one-to-many type of traffic) What Isn’t Multicast? Unicast traffic is what makes up virtually all internet traffic today; i.e. HTTP goes over TCP, which is a reliable unicast protocol

source If Multicast Is Not Used … The Source can’t afford the bandwidth! The same traffic is going over one link multiple times. Thank you Sauleh Eetemadi for the animations!

source IP Multicast Was born with WWW in early 90’s, but deployment is far behind expectation!

Unicast Over Wireless

Multicast Over Wireless Wireless is already multicast

Multicast and Unicast Throughput over b Data source: Performance of Reliable Transport Protocol over IEEE Wireless LAN: Analysis and Enhancement; Haitao Wu, et al; IEEE InfoCom Mbps 460 Kbps

Unicast: It Gets Worse… Wireless MAC contention The ‘x’ factor: TCP contention Wireless signal strength Competing signals / uses Result? It usually takes an act of God to get 20 laptops in the same room to have “usable” wireless.

Multicast Is My New Best Friend? Multicast doesn’t guarantee reception Data loss is “bursty” –(Ink packets are lost when slides aren’t) Hardware problems –Intel Centrino issue / PSP –Latest firmware for AP important –Unusual problems seen on ‘g’ networks

ConferenceXP “Research platform” / “RDK” –Free download for non-commercial use –Shared Source Two-part strategy: –High-quality A/V conferencing –In-class learning technology platform No perfect solution General upward trend; technology is still early Early adopter: Classroom Presenter

Looking Forward Reliable multicast (Wenjun Zeng) CXP 4.0 New wifi technologies Share your experiences: Message Boards Distribution Lists Soon to come: Wiki!