Wireless Ad Hoc and Sensor Networks

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Distributed Fair Scheduling in Wireless Ad Hoc and Sensor Networks 325150Star topology with varying packet sizesADFSThroughput/weight (Kbps)1005002 4 6 8Source nodes10 12 14 16FIGURE 7.5Star topology with varying packet sizes.250Star topology with different weightsADFS200Throughput/weight (Kbps)1501005002 4 6 8Source nodes10 12 14 16FIGURE 7.6Star topology with different initial weights.
326 Wireless Ad Hoc and Sensor Networksflows are chosen as 0.1, 0.075, 0.05, and 0.025, with 4 flows selecting eachof these weights. Observe that the sum of the weights is equal to one. Thefigure shows that the ADFS algorithm results in fair allocation of bandwidtheven when flows have been assigned different initial weights.Example 7.4.2: Random TopologiesnThe ADFS protocol is now simulated for scenarios with n nodes, and22flows where the weight of each flow is . In general, initial weights arenassigned based on user specified QoS. Figure 7.7, Figure 7.8, and Figure 7.9represent the throughput/weight (normalized weights) ratio vs. the flowsfor networks with 32, 64, and 128 nodes, respectively. Plots show thatADFS and DFS result in fair allocation of bandwidth compared to the802.11 MAC protocol. Moreover, it can be observed that, though ADFSand DFS give almost the same degree of fairness, ADFS renders 10 to 20%higher throughput compared to DFS, due to weight adaptation anddynamic backoff intervals.The results shown in Figure 7.10 are for a network with 32 nodes and16 flows. Packet sizes of 584, 328, 400, and 256 are used for different flows.It can be seen that ADFS achieves fair allocation of bandwidth, even whenpackets of different sizes were used. Figure 7.11 depicts the throughput/weight ratio for the flows having different initial weights. The initial450400350ADFSDFS802.11Throughput/weight (Kbps)3002502001501005005 10 15 20Flows25 30FIGURE 7.7Performance of ADFS with 32 nodes.
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Wireless Ad Hocand SensorNetworksPr
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18. Chaos in Automatic Control, edi
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CRC PressTaylor & Francis Group6000
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Table of Contents1 Background on Ne
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3 Congestion Control in ATM Network
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5.4.2 Distributed Power Controller
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7.3 Adaptive and Distributed Fair S
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9.2.2 Overview.....................
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the number of connections in each l
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y Maheswaran Thiagarajan, and tirel
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2 Wireless Ad Hoc and Sensor Networ
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10 Wireless Ad Hoc and Sensor Netwo
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2BackgroundIn this chapter, we prov
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Background 51u(k)x n (k + 1)x n (k)
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Background 53with x( 0)being the in
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Background 55with tr(.) the matrix
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Background 57nGiven a function ft (
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Background 592.3.2 Lyapunov Stabili
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Background 61as well as Jagannathan
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Background 63The subsequent example
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Background 65Evaluating this along
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Background 67Now, select the feedba
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Background 69is SISL if and only if
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Background 71L 1 (x)L(x, t)L 0 (x)0
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Background 73for some R > 0 such th
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Background 75Evaluating the first d
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Background 77Section 2.4Problem 2.4
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100 Wireless Ad Hoc and Sensor Netw
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4Admission Controller Design for Hi
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Admission Controller Design for Hig
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Optimized Energy and Delay-Based Ro
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9Predictive Congestion Control for
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Predictive Congestion Control for W
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10Adaptive and Probabilistic Power
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Adaptive and Probabilistic Power Co
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Wireless Ad Hoc and Sensor Networks

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