Autonomous Mobile Mesh Networks and their Design Changes.

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

Mobile mesh VS Fixed mesh networks

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