23-08-2014, 12:11 PM
ADAPTIVE MAC IN MANET
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Introduction
A mobile ad hoc network (MANET) is a peer-to-peer network of communication devices that establish a connection between themselves on the fly, without the need for a fixed infrastructure, and maintain this connection without the need for a centralized controller
MAC
Performs the challenging task of resolving contention amongst nodes while sharing the common wireless channel for transmitting packets.
Medium access control (MAC) protocols have been widely studied for wireless networks due to its low cost and easy implementation. IEEE 802.11 MAC is such a protocol that has been successfully deployed in wireless LANs and has also been incorporated in many wireless testbeds and simulation packages for wireless multi-hop mobile ad hoc networks
Contd
The physical (PHY) layer carries information over the wireless medium.
The network layer exchanges information to find and configure efficient and reliable paths between any two nodes in the MANET.
The transport layer maintains end-to-end connectivity by handling delays and packet losses.
Finally, the application layer consists of applications which can cope with the frequent disconnections and reconnections of the peer-to-peer nodes
LOAD ADAPTIVE MAC PROTOCOL
Operate in three modes: CSMA, TDMA, and HYBRID.
The protocol operates in CSMA mode when nodes have no knowledge about the network topology or when they lose synchronization.
In the other extreme, the protocol switches to TDMA mode when the synchronization information is available and all nodes are restrained to transmit in their own time slots.
In any situation other than two extreme cases, LA-MAC operates in a HYBRID mode, blending CSMA and TDMA modes of operation.
Motivation
In MANET, the reduction of routing message overhead will decrease the wasted portions of bandwidth that used for exchange routing messages between nodes, and increase the bandwidth available for transferring data, which in turn increases the network throughput and decreases the latency.
To function normally, MANETs demand an efficient and distributed medium access control (MAC) protocol. At the MAC layer, the open shared channel imposes a lot of great challenges to the medium access control design.
Objectives
Study various existing MAC protocols in MANET.
Modify the existing or proposed a new adaptive MAC protocol that consumes less energy.
Implement the proposed protocol using NS2 and analyze the results.
References
Dr. P.S. Patheja et. al. , “An Adaptive MAC 802.11 Protocol for MANET Using Exponential Algorithm”, P.S. Patheja et al, / (IJCSIT) International Journal of Computer Science and Information Technologies, Vol. 4 (2) , 2013, 358 – 362.
IEEE standard for Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) specifications, ISO/IEC 8802-11: 1999(E), Aug. 1999
Contd
Hu, Weihong, Xiaolong Li, and Homayoun Yousefi'zadeh. "LA-MAC: A load adaptive MAC protocol for MANETs." Global Telecommunications Conference, 2009. GLOBECOM 2009. IEEE. IEEE, 2009.
Arvind Kumar et. al. , “Performance Evaluation Of Mac Rotocols For Ad-Hoc Networks Using Directional Antenna”, International Journal of Wireless & Mobile Networks(IJWMN) Vol. 3, No. 6, December 2011 DOI : 10.5121/ijwmn.2011.3602.
Hongqiang Zhai et. al. , “Medium Access Control Protocols in Mobile Ad Hoc Networks: Problems and Solutions”,2005.
S. Bandyopadhyay et. al. , “An Adaptive MAC Protocol for Ad Hoc Networks with Directional Antenna”, IEICE TRANS. COMMUN., VOL. E84-B, No.11 NOVEMBER 2001