Post on 24-Feb-2016
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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
Page 240
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 Katrina
If 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 S
OSI 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 group
A way to update the group is a node goes down or leaves the group
A 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-demand
The 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 eavesdropping
Wal-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