3.5 PERFORMANCE EVALUATION AND DISCUSSIONS
In this section we have discussed on performance evaluation and scenario used for network simulation. We later explained and analyzed the results.
3.5.1 Simulation Scenario
The most widely recognized network simulator, ns-2 [16], is used to evaluate the effectiveness of our mechanism. We compared the performance of standard IEEE 802.11 [13], RTS validation [5], and our proposed enhancements.
The network model of a multihop wireless topology and routing protocol ad hoc on demand distance vector (AODV) [15]. The link layer is a shared media radio with nominal channel bit rate of 1 Mbps. The antenna is omnidirectional with radio range of 250 m.
Setup parameters are listed here: slot time = 20 μs, SIFS = 10 μs, DIFS = 50 μs, propagation delay = 2 μs, RTS threshold = 0 bytes.
Traffic source and destination pairs are randomly spread over the network. Type of traffic is constant bit rate (CBR) with packet size randomly chosen between 512 and 2048 bytes, to prove that our evaluation process is not affected by the frame size. We have created 30 sets of CBR traffic. The sum of all the senders' transmission rate is represented as offered load. For example, if the offered load is 600 kbps, then the transmission rate of CBR traffic is 20 kbps.
The random waypoint model is used. In this model, a mobile station begins by staying at one location for a certain period of time (we call this pause time). Once this time expires, this station chooses a random ...
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