Mesh Networking Emily Bates | Joe Garrow Andreas Gillberg | Al Godin.
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Transcript of Mesh Networking Emily Bates | Joe Garrow Andreas Gillberg | Al Godin.
Mesh
Networking
Emily Bates | Joe Garrow
Andreas Gillberg | Al Godin
Agenda
1.Network topology review2.Types of mesh topologies3.Disadvantages of mesh4.Advantages of mesh5.Modern uses of mesh networking6.Why hasn’t it caught on?
Network
Topologies
The topology is the physical layout of a network• Related to the specific
networking technology and specific standards used
Types of Network Topologies• Star• Bus• Ring• Mesh
Star Topology
• Most common topology• All devices connected to a
central point• The basic hub sends/receives in
and out all information to all devices
Ring Topology
• Each device connect to the next device in a logical loop
• Send packets around loop• Each device acts as a
repeater
Bus Topology
• Each device connected to the one next to it
• All devices receive every signal sent
• Each device has to coordinate when it sends data so it won’t collide with other data
Mesh Topology
Wired Mesh• Every device is connected on a dedicated line• Many connectionsWireless Mesh• Fixed wireless using ad hoc• Mobile peer-to-peer using ad hoc• Node to node (infrastructure)
Wireless Mesh
Network Video
https://www.youtube.com/watch?v=hWnvRjSlA1Q
Full Mesh
Topology
• Every device connected to every other device
• Direct communication between devices
• Difficult to scale
Partial Mesh
Topology
• Devices are grouped into nodes which are connected to other nodes
• Typically used for larger networks
• Still allows communication between devices but not every device is directly connected to each other
Point-to-Point
Partial
• Simplest form of wireless network
• Download and upload link connected by two antennas in direct communication with each other
• Not scalable
Point-to-
Multipoint
Partial
• Uplink node is connected to omni-directional antenna that transmits data to other antennas
• Nodes download data from their dedicated antenna
• Better scalability than point to point
• Antennas must be in range of each other
Multipoint-to-
Multipoint
Partial
• Similar structure to wired internet
• Multiple omni-directional antennas connect with each other and send information to devices
• Data sent along optimal path from sender to receiver
Metropolitan
Partial
• Connection of M2M sub-networks with other M2M sub-networks
• Uses two different types of antennas to connect nodes
• Allows for greater functionality over a greater area
Disadvantages
Wired Mesh Networks• Large investment necessary to build
wired network (cables, hardware ports, etc)
• Difficult to install and reconnect• Bulk of wiring can exceed space
restrictionsWireless Mesh Networks• Uses a lot of bandwidth causing
slower interactions• Low interoperability
Advantages
General Mesh Networks• Connect to many devices
simultaneously• No need for a central node• Easily scalableWireless Mesh Networks• Inexpensive• Even more scalable• Supports high demand• Outdoor connectivity• Fault tolerance
Versatility
• Home automation• Education• Healthcare• Military/Defense• Public safety• Hotels• Warehousing• Mobile communication• Solar powered networks• Developing communities
Communicatio
n: FireChat
• iOS and Android app• Utilizes new Multipeer
Connectivity framework• Infrastructure WiFi• Peer-to-Peer WiFi• Bluetooth PANs
• 100 foot range
One Laptop
Per Child
• US non-profit organization• Bring technology to
developing nations• XO laptop model
• Rugged design• Flash storage• Linux OS
• Mesh networking• Student collaboration• Greater range• No maintenance
• 2.4 million laptops delivered
SolarMESH
• Solar and battery powered access points
• Could provide universal access
• Inadequate power
Open Mesh
Project
“Take away the wires and routes and we will still communicate.”
• In January 2011, Egyptian government blocked the entire internet
• Open Mesh Project aims to circumvent government restrictions
• Open and free communication internationally
• Two-click installation
FunkFeuer
• Free and open mesh network• Vienna, Austriahttps://www.youtube.com/watch?v=PGlMmp056_U
Military,
Defense, Public
Safety
• Mobility• Speed and performance• Scalable• Secure through encryption• Variety of uses
• Police• Soldiers• Tanks and military vehicles
Technical
Limitations
• Complexity to set up and maintain
• Difficult for routing protocols to scale over a few hundreds nodes
• Limited range of wireless user devices
Other Issues
• Cannot be easily regulated
• Regarded as a potential danger by the government
• Ethical issues: Seattle Police Department