Transcript Technical Aspects

Wireless Mesh-Networks for Interconnection of
Remote Sites to Fixed Broadband Networks
Feasibility Study
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TF-Mobility Meeting, Vienna, 18.02.10
Kurt Baumann
[email protected]
Outline
Feasibility Study
- Proposal
- Physical testbed
- Technical aspects
- Results
- Conclusion and further projects
© 2010 SWITCH
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Proposal
The project investigates the feasibility of multi-hop wireless
mesh networks for connecting sensor networks or other
devices deployed in remote areas, where no fixed network
access is available, to a fixed broadband network.
Distances of (several) 10 km need to be traversed.
The project will evaluate Quality-of-Service parameters such as
bandwidth, delay, and robustness that can be expected from a
solution, which is based on transmission over multiple hops
and multiple paths.
Project lead: University of Bern
Industry-Partners: MeteoSwiss / SWITCH / pcEngines
© 2010 SWITCH
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Physical Testbed
CTI-Link, area Payerne:
Redundant-Link:
1070m
10300m
11500m
Link1: Payerne <==> Corges <==> Sur Le Mont <==> University-Neuchâtel
6760m
1000m
14100m
Link2: Payerne <==> Belmont <==> La Gotta <==> University-Neuchâtel
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Technical Aspects
Mesh-Node:
PCEngines Alix.3DA board
Core of the Mesh nodes contains
500 MHz AMD Geode LX800 CPU,
256 MB RAM, 2 miniPCI slots with
IEEE802.11a/b/g/h cards, 1Ethernet
IF, 1GB Compact Flash Card
Aluminium weather sealed (IP-67)
outdoor. Software: Linux distribution,
an development of University of Bern
called ADAM( Administration and
Deployment of Ad-hoc Mesh
networks)
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Two directional panel antennas
Frineta, 5.1-5.875 GHz, 23dBi gain,
© 2010 SWITCH
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Technical Aspects
Mast:
Telescopic mast sideways slotted
aluminum (6)Tubes, max. 9 m with tripod
Requirements to the mast type:
- Costs
- Transportability
- Project duration
- High acceptance for the landowner
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© 2010 SWITCH
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Technical Aspects
Power-Provisioning Nodes:
Powered by the electricity grid or solar pannel
2 nodes: UniNE and MeteoSwiss are
connectedvia lightning protector and PoE
to the grid.
4 nodes are supplied with electricity by
solar - 80W panel. Power equipment in
a aluminum box inside a solar-charger,
an acid battery (65Ah, 12V - 10days self
charging), a lightning protector and a
passive PoE
Node (power consumption approx. 3.3 W)
on the antenna is connected with a twisted
pair cable to the electric supply box.
Network connectivity over Ethernet for on
site maintenance.
© 2010 SWITCH
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Technical Aspects
Node on the rooftop of MeteoSwiss:
This node operates as a sensor node, an IP capable
camera.
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http://cti-mesh.ch/cgi-bin/smokeping.cgi?target=CTI-Mesh
© 2010 SWITCH
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Technical Aspects
Route availability to node 6 (IP camera) at node 1
© 2010 SWITCH
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Results
Free Space Loss Model
Nodexx
Neuchâtel ⇔Sur le Mont
Sur le Mont ⇔Corges
Corges ⇔ Payerne
Payerne ⇔Belmont
Belmont ⇔ La Gotta
La Gotta ⇔Neuchâtel
dm
11500
10300
1070
6760
1000
14100
FZr(m) Hmin(m) FSLdB
7.513 9.463 128.47
7.110 8.668 127.51
2.291 2.308 107.85
5.760 6.431 123.86
2.215 2.223 105.26
8.319 11.239 130.24
Si(dBm)
-77.09
-76.13
-56.46
-72.47
-53.87
-78.86
Pout(mW)
7.277
7.277
7.277
7.277
7.277
7.277
d(m): Distance between two nodes
FZr(m): Radius of the first Freznel Zone (60%)
Hmin(m): Min of antenna high
FSL(dB): Free Space Path Loss
Si(dBm): Received power level at receiver input
© 2010 SWITCH
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Conclusion / Further Projects
View of SWITCH:
Feasibility study is a success story in extending the network Coverage
Locations: In the project, the interconnection of the WMN and the SWITCH fibre backbone
was build up easily at the University of Neuchâtel. As currently no process
to get access to the backbone on an arbitrary location is defined and in
place, the backbone access has to be checked and supported individually
for each location; that makes it personnel-intensive and therefore costly.
The feasibility study showed that, currently, the network reliability as well
as the data-throughput of the prototype network do not allow providing
WMN specific solutions for wireless broadband connections of customer
Sites.
Follow-up project will allow investigations on the network reliability and
throughput by reengineering the wireless interface driver, routing software,
and self-healing mechanisms. Furthermore, the handling of the antenna equipment
as well as the alignment-process of the antenna has to be simplified
for the end-users.
Moreover the attractiveness of this service could be enhanced by increased data rates of newer wireless
communication standards e.g. IEEE802.11n.
© 2010 SWITCH
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Wireless Mesh-Networks for Interconnection of
Remote Sites to Fixed Broadband Networks
Feasibility Study
Q&A
Kurt Baumann
[email protected]