autonomous mobile mesh networks and their design changes
TRANSCRIPT
CURTIS OELMANN
Autonomous Mobile Mesh Networks and their Design
Changes
Ad hoc wireless networks
Set of mobile nodes that are:Self-organizingSelf-healingSurvivableInstantaneously available
all without having infrastructure
Multi-hop mesh networks
Has two or more hops to any one node. These networks should also have
multiple paths to get to a particular node. The data being transmitted will “hop” to
each node until the data reaches its particular destination.
Must be able to update the current layout of the mesh network incase a node leaves the area.
Mobile Mesh Networks
Autonomous Multi-hop Highly dynamic Human-centric Broadband mesh networks
Categorization of mesh networks
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History of the wireless network
Public Safety Services
Work on the 4.94 - 4.990GHz band
Car accidents and first responders Surveillance-youtube.com
Disaster relief
Hurricane KatrinaIf there had been a mesh network, nodes
from inside New Orleans would have been able to pinpoint where people were.
With surveillance cameras mounted on telephone poles, the data would have been able to go from hop to hop transmitting data back to the first responders and police.
The people we seen looting from stores would have been prosecuted because the police would have had video
Defense/Military operations
Easily torn down and set up
On the move support
Voice over ip
Consumer/Home Networking
New Blu-ray Dvd players
Surround sound
Wireless routers are limited, with multi-hop devices, the range is much greater.
Transportation Applications
I-pass
Example of a autonomous wireless network
Physical Radio Channels
Commercial-off-the –shelf (COTS) Work on the 802.11 standard Allows access to many types of devices
todayPDALaptopsCell phonesOther home appliances
Medium of Mesh networks
Can work with access points connected to the internet or company intranet.
Task Group SOSI layer 2 mesh
○ Called ‘Extended Service Set (ESS) Mesh Networking’
Autonomous systems can stand alone, so the discovery process is needed to find other nodes in the area that are also supporting this type of access.
Routing and Multicasting
We need :A way to discover if a new node has entered
the groupA way to update the group is a node goes
down or leaves the groupA way to minimize the number of hops data
takes to reach the destination.A way to maximize the bandwidth being usedA way to minimize power consumption by the
nodes
Choosing a Route
On-demandThe routes are established when a packet is
sent. When the receiver gets a packet, they look at the route it took, and get the layout topology of other nodes in the group
ProactiveThe nodes are continuously updating the
topology by sending small packets○ High overhead
Route Reestablishment
Class exercise
Security
Wireless eavesdroppingWal-Mart Example
DOS‘Node a’ sending countless packets to ‘node
b’ could block access to other node, ‘node c’ from being able to use ‘node b’ to get to ‘node d’
IP Addressing
Needs have a large set of address space IPv6IPv4 only give 4 billion addresses
○ It is feasible for two computers to have the same address.
IPv6 would give 2128 or about 3.4×1038
Helps With DAD (duplicate address detection systems)
Roaming
Node should be able to:Roam from one network to anotherConnections should be seamlessShould not lose connections to data that
may be criticalAcquire new IP addresses instantaneously
whether another autonomous mesh or a fixed mesh
Applications
Real time video Voice over Multi-hop mesh Instant Multimedia messaging Resource tracking Affinity group