Wireless Ad Hoc and Sensor Networks

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Distributed Fair Scheduling in Wireless Ad Hoc and Sensor Networks 331Throughput/weight (Kbps)380360340320300280260240ADFS-4ADFS-10ADFS-12ADFS-26DFS-4DFS-10DFS-12DFS-26802.11-4802.11-10802.11-12802.11-26Throughput/weight220200180200 250 300 350 400 450 500Per flow rate (Kbps)FIGURE 7.14Performance evaluation with low rates.1.05Fairness index10.950.9Fairness index0.850.80.750.70.650.6200 250 300 350 400Per flow rate (Kbps)ADFSDFS802.11450 500FIGURE 7.15Fairness index with different flow rates.
332 Wireless Ad Hoc and Sensor Networks14 × 10−3Contention time12Contention time (sec)108642200 250 300 350Per flow rate (Kbps)ADFS-4ADFS-10ADFS-12ADFS-26DFS-4DFS-10DFS-12DFS-26802.11-4802.11-10802.11-12802.11-26400 450 500FIGURE 7.16Contention times with different flow rates.Figure 7.16 shows the average contention times of four randomly selectedflows, using ADFS, DFS, and IEEE 802.11 MAC protocols with differentflow rates. Observe that the average contention time keeps increasing tillthe channel gets congested (around 300 Kbps per flow rate), and almostremains constant after 300 Kbps. It can also be noted that there is smallincrease in the average contention times using both ADFS and DFS protocols,whereas compared to 802.11 protocol, due to the slight computationalcomplexity involved in using these protocols.7.5 Hardware ImplementationAs part of this work, hardware implementation of WSNs with the ADFSprotocol was also shown. Challenges for hardware implementation ofADFS on WSNs include memory limitations, low processing power, andselection of priority sensor flows. Selection of fair bandwidth allocationsfor the sensor flows, or based on QoS, must also be established based onuser requirements.Introduction of the 802.15 standard has accelerated the application ofWSNs in industrial environments. Use of small, low-power, radio-enabled
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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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