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### hw5

Course: COSC 6397, Fall 2008
School: U. Houston
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Word Count: 386

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Homework COSC6397 Assignment 5 (TCP in MANET) October 20, 2004 Due date: Nov. 3, 2004; Maximum group size = 2 In this mini-project, we experiment with TCP performance in MANET. 1 Capacity of Grids In the class, we analyze the capacity of a chain topology using back-ofenvelop computation. The main idea is to nd out how many simultaneous transmissions are allowed. For this project, you are required to rst...

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Homework COSC6397 Assignment 5 (TCP in MANET) October 20, 2004 Due date: Nov. 3, 2004; Maximum group size = 2 In this mini-project, we experiment with TCP performance in MANET. 1 Capacity of Grids In the class, we analyze the capacity of a chain topology using back-ofenvelop computation. The main idea is to nd out how many simultaneous transmissions are allowed. For this project, you are required to rst conduct a similar analysis on the lattice topology shown in Figure 1 and then verify it using NS-2 simulations. The setup of the simulations are described in Table 1, where interference range is dened as, a receiver cannot successfully receive any packet if there is another transmission within the interference range. Capacity Analysis (10pt) Consider NxN lattice (N = 2, 4, 6, 8) and horizontal ows shown in Figure 1 (a). Suppose that each ow is transmitted at the same rate. What is the maximum rate of a ow that the network can accommodate? In Figure 1 (b), besides the horizontal ows, there are Table 1: Simulation Setup Grid size 200m Transmission range 250m Interference range 550m Packet size 64B, 500B, 1500B Maximum rate of wireless link 2Mbps 1 (a) (b) Figure 1: Graph Problem for 1 vertical ones. What is the maximum rate of a ow in this case that the network can accommodate? Verication Using NS-2 (10pt) Use the gen-grid.tcl downloadable from WebCT, generate scenario les for 2x2, 4x4, 6x6 and 8x8 lattice graphs. Establish TCP connections as shown in Figure 1 together with bulk ftp sources at the senders. Vary the packet size of the ftp source as 64B, 500B, 1500B. Set the RTS threshold to 0. Determine the throughput (application layer bits/s) of each TCP connection in Figure 1 (a) and (b). Explain the dierence between the experimental and analytical results from the previous part. P Ti 2 (Bonus (5pt)) Dene throughput fairness index as f i = ( P T)2 , where n i Ti , i = 1, .....

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