Wireless any pre-determined plan. The nodes are connected to

Wireless Networks can be categorized into two classes; infrastructure based and non-infrastructure networks. In infrastructure based networks, all the nodes are controlled by a centralized access point or base station whereas in infrastructure less networks the nodes are self-organized by nature and co-operate with each other without any central control. Mobile Ad-Hoc Network (MANET) is an example of infrastructure less network. It can be established any where any place at any time without any pre-determined plan. The nodes are connected to each other without any central access point. The self-organizing capability of each node makes each node to find the next hop neighbor to send the data packet. Data is transmitted from one node to the other node to reach at the destination in the absence of a central coordinator. So, MANET is considered as infrastructure less, multi hop and fast growing dynamic topology 1. The wide applications of MANET includes defense, military, disaster hit areas, battle field, health care, agriculture etc. has brought a lot of curiosity among the researchers to analyze the routing protocols as routing is mostly effected due to the mobile node 2. The general model of MANET is shown in Fig.1. Major challenge in MANETs is how to provide reliability and link connectivity for efficient transport of data. The dynamic topology, error prone wireless channel, and self organizing capacity of MANET makes routing more challenging compared to traditional cellular network. The purpose of routing protocol is to define some set of rules that each node has to follow to communicate with other nodes. Routing algorithm follows the specific choice of path to disseminate the data and to select a path between any two nodes available in the net    work. Each node knows the network topology in advance and also maintains its own routing table. Routers collect information about network topology by distributing information among proximate neighbours 3.  Figure 1. General model of MANET  MANET’s are also known as “autonomous system” due its dynamic and unpredictable nature 4. In order to maintain a steady communication in MANET, route discovery mechanisms must be very efficient in case of node failures or movement 5. MANET is a special subset of wireless ad hoc network. Hence, it is limited to power and other available resources (bandwidth, range). In MANET, when the node moves from one location to other the velocity, acceleration, and location of users vary with respect to time. Hence, different mobility models are used to identify these mobility patterns and there is a requirement to analyze various mobility models. The reason is that the mobility model has great impact on the performance of the routing protocol. Otherwise, the performance measures of MANET may not be accurate and it can mislead the application. So, it is necessary and essential requirement to choose the underlying mobility model while evaluating the performance of MANET 6. In general File Based Mobility and group mobility models are the two mobility models in MANET. File Based mobility 7 is the mobility model in which user specifies Waypoints for all the nodes in the network. It is also helpful in determining the node movement pattern in advance. The node position file contains related information in the format: