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SUMMARY:TDMA For Long Distance Wireless Networks - Sam Leffler (FreeBSD)
DTSTART:20090921T150000Z
DTEND:20090921T160000Z
UID:TALK19516@talks.cam.ac.uk
CONTACT:Eiko Yoneki
DESCRIPTION:In 2006 the UC Berkeley TIER Project studied the need to deplo
 y network infrastructure to emerging regions. Their goal was to “address
  the challenges in bringing the Information Technology revolution to the m
 asses of the developing regions of the world”. Out of that work came pla
 ns for WiFi Based Long Distance Networks (WiLDNet) that leveraged commodit
 y 802.11 wireless parts to preserve cost savings. WiLDNets were specifical
 ly intended for deployments where station separation far exceeded normal 8
 02.11 use (e.g. 30-100 kilometer station separation). A key component of t
 he WilDNet design was the use of a Time Division Multiplex Access (TDMA) M
 AC in place of the standard DCF MAC that is part of the 802.11 specificati
 on.\n\nAbout the same time the Intel Research Laboratory in Berkeley\, CA 
 developed the Rural Connectivity Platform (RCP). TIER was a joint project 
 between UC Berkeley and Intel and the RCP was an offshoot focused more on 
 easy setup\, low maintenance\, and production use. For TDMA the RCP projec
 t developed a unique scheme to leverage the capabilities of Atheros wirele
 ss devices to implement TDMA almost entirely in hardware. The scheme has p
 roven to work very well and has been incorporated in commercial products. 
 In 2008 the RCP software base was moved from Linux to FreeBSD and in 2009 
 Intel released the FreeBSD implementation of the TDMA software. This talk 
 describes the protocols and algorithms as they appear in FreeBSD 8.0.\n\nS
 lides and paper:\n\nhttp://www.freebsd.org/sam/TDMAPresentation-20090921.p
 df\n\nhttp://www.freebsd.org/sam/FreeBSD_TDMA-20090921.pdf\n\n\nBio: Sam L
 effler has been actively working with UNIX since 1975 when he first encoun
 tered it at Case Western Reserve University.  While working for the Comput
 er Systems Research Group (CSRG) at the University of California at Berkel
 ey he helped with the 4.1BSD release and was responsible for the release o
 f 4.2BSD.  He has contributed to almost every aspect of BSD systems\; most
  recently working (again) on the network subsystems.  For the past few yea
 rs he has focused on wireless networking--his work appears in open source 
 projects and many commercial products.\n
LOCATION:FW26\, Computer Laboratory\, William Gates Builiding
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