03-03-2011, 03:01 PM
Submitted By Shiv Mewada
[attachment=9458]
Literature Review on “ A Secure Key Management Model For Wireless Mesh Networks
INTRODUCTION OF WMNs
• Wireless mesh network is an advanced form of wireless network.
• Wireless Mesh Networks (WMNs) represent a good solution to providing wireless Internet connectivity in a sizable geographic area;
• Wireless mesh networks (WMNs) are composed of two main node types, Wireless Mesh Clients (WMC) and Wireless Mesh Routers (WMR).
• The most commonly used technology in day to day life is desktops, laptops, PDA’s, Pocket PC’s, Phones etc.
• Wireless mesh networks (WMN) are multi-radio, multi-hop network with the ability of dynamically self-organized and self-configured, with the nodes in the network automatically establishing and maintaining mesh connectivity among themselves (creating, in effect, an ad-hoc network).
• Wireless mesh networks can be implemented with various wireless technologies including IEEE 802.11 (IEEE STANDERD)
• According to 802.11s standard Nodes in a mesh network can be divided into four classes, Client or Station (STA), Mesh Point (MP), Mesh Access Point (MAP) and Mesh Portal Point (MPP).
Current Wireless Systems
• Cellular phones and pagers -- provide connectivity for portable and mobile applications, both personal and business
• Global Positioning System (GPS) -- allows drivers of cars and trucks, captains of boats and ships, and pilots of aircraft to ascertain their location anywhere on earth
• Cordless computer peripherals -- the cordless mouse is a common example; keyboards and printers can also be linked to a computer via wireless
• Cordless telephone sets -- these are limited-range devices, not to be confused with cell phones
• Home-entertainment-system control boxes -- the VCR control and the TV channel control are the most common examples; some hi-fi sound systems and FM broadcast receivers also use this technology
• Remote garage-door openers -- one of the oldest wireless devices in common use by consumers; usually operates at radio frequencies
• Two-way radios -- this includes Amateur and Citizens Radio Service, as well as business, marine, and military communications
• Baby monitors -- these devices are simplified radio transmitter/receiver units with limited range
Satellite television -- allows viewers in almost any location to select from hundreds of channels
The important characteristics of a WMNs include:
• Multi-hop wireless network that:
– Extends coverage range without sacrificing channel capacity
– Improves connectivity among users without line of sight
• Support for ad hoc networking, and capability of self-forming,
self-healing, and self-organization.
• Mesh routers usually have minimal mobility, while mesh clients can be stationary or mobile nodes.
• Multiple types of network access
•wide coverage and cost reduction and
• Reliability
Wireless mesh networking has many possible applications
• Broadband home networking
• Community and neighborhood networking
• Enterprise networking
• Metropolitan area networking (MAN)
• Transportation systems (Timetable, delay info)
• Building automations
• Health and medical systems
• Security surveillance systems
• Emergency disaster system
• Industrial automation
• Office WLAN environment
The important capabilities of a mesh network include
• Self-configuring communication and routing
• • Ability to deal with hidden terminal problem
• • Installation, management, QoS and resource scheduling, security, co-existence
• • Interference management; interference-aware route construction
• – Including ad-hoc IP routing
• • Scheduling and collision detection and management