Presentation about Ile sans fil, community wireless vs. muni-wireless that I did as part of the Society for Arts and Technology's 2008 series of conferences.

1. Wi-Fi
 LAN not WAN
 Nomadic not Mobile
 Quick and Dirty Technology
 Cheap and Easy Operation
 CPEs Matter

3. The Good
 Innovative business model
 140 hotspots
 60 000 users (sort of)
 Wifidog
 Power of motivated (and bored) people

4. The (not so) Good
 Only achieved first of two goals
 Volunteers don’t scale
 Strange creatures are hard to fund
 Market timing
 Must evolve to stay relevant

5. Ile sans fil + City of
Montreal
 Financial support over 5 years
 Deploy 150 outdoor APs
 Grow total network to 400 nodes
 Facilitate access to City infrastructure
 Facilitate access to City partners

6. Ile sans fil + City of
Montreal
 Providing popular service to citizens
 Supporting a successful local initiative
 Enhancing Montreal’s image
– Cool Tech Hub
– Innovative

7. Ile sans fil + City of
Montreal
 Full time project manager
– Coordinate deployments, manage partnerships
 Tech on call for peaks and emergencies
 HR partnerships
 Fund R&D work
– Laptops → Handsets
 **Focus on second objective**

8. The Future
 Applications on top of network
– Expose & document APIs
– Collaborate with artists & community
Keeping service providers honest
– Net neutrality, device independence, reasonable
rates, etc.
 Harnessing new tech for the public good

9. Internet is innovative
because:
 End-to-end principle
 Dumb networks
 Simple standards
 Open is better than closed

10. Backup
 IMS
– Violates « end-to-end » principle
– Violates « intelligence » at edge principle
– Lots of complexity for no new services

11. The IETF SIP Trapezoid
Outbound
Proxy Server
User Agent B
Inbound
Proxy Server
User Agent
A
SIP
SIP
SIP
Media (RTP)
DNS Server
DNS
Location
Server
SIP
Henry Sinnreich and Alan Johnston

12. 3GPP IMS Core Architecture
The 3G IP Multimedia System (IMS)
Gonzalo Camarillo and Miguel A. Garcia-Martin

13. OtherIPNetworks
IP Transport (Access and Core)
T-MGF
I-BGF
UPSF
P-CSCF
I/S-CSCF
BGCF
SLF
Charging
Functions
IWF
PSTN
Emulation (R2)
Mw
Mw/Mk/Mm
Mr
Mg
Mj
Mi
Mp Mn
Gm
Gq'
ISC
Cx Dx
Dh
Sh
Ic
Rf/Ro
Rf/Ro
Ib
Iw
Gq'
PSTN/ISDN
SGF
MRFC MGCF
MRFP
e4
Ie
Mw
IBCF
Mk
Mk
Application Servers
Rf/Ro
AGCF
e2
P1
P2
P3
UE
CNG
MG
IMS /
PSTN
Simulation
Gq'
-
SPDF
A-RACF
Resource &
Admission
Control
Resource &
Admission
Control
SPDF
Network
Attachment
Subsystem
Re Ia
RCEF BGF
Ut
Ut
Overall ETSI TISPAN IMS Architecture
– all (optional) subsystems

14. Backup
 Android: security model
 OpenMoko - Neo1973
 Qtopia - Greenphone