Wireless Ad Hoc and Sensor Networks

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Distributed Power Control and Rate Adaptation 279Totaldata per Joule (Kbits/J)262422201816141210860 10Data transmitted per Joule50 nodes, 25 flows, duration 25s20 30 40 50 60Per-flow rate (Kbps)Rate adaptation with DPCRBARFIGURE 6.21Data transmitted per joule for varying per flow rate.6.10.3 Random Topology with 50 NodesFigure 6.21 shows the total data transmitted by 25 constant bit-rate (CBR)sources and received at the destinations, in the presence of fading channels,whereas the energy efficiency is presented in Figure 6.19. Asexpected, the proposed protocol transmits more data and consumes lessenergy per bit when compared to the RBAR protocol for all the trafficrates because of the proposed rate adaptation. These results reaffirm theconclusions from the previous simulations.6.10.4 Two-Hop ResultsThe two-hop topology has been used while simulating the proposedDP-based scheme (PDP). For comparison, a modified RBAR protocol(BURST), which supports a burst mode, is used. The same parametersused in the previous simulations have been used. In addition, the informationfor the other parameters needed to simulate the DP-based algorithminclude: cost function parameters Q = 05 . and α = 24 . (from Figure6.17), and an expected power value was taken as 100 mW. The stable valueof G was calculated as 0.667. The target queue utilization is set at 30packets per flow. The burst size, outgoing, and incoming traffic areexpressed in number of packets (or number of packets per second). Furthermore,the burst duration was set to one packet duration when usingthe lowest rate. Consequently, the burst at the lowest rate of 1 Mbps can
280 Wireless Ad Hoc and Sensor NetworksTotaldata (Mbits)9876543210 10Totaldata transmitted per Joule50 nodes, 25 flows, duration 25s20 30 40 50 60Per-flow rate (Kbps)Rate adaptation with DPCRBARFIGURE 6.22Total data transmitted for varying per flow rate.accommodate one packet, the second rate of 2 Mbps can accommodateburst of maximum 2 packets, etc.In case of low congestion with per flow traffic of up to 300 kbps, bothprotocols can transmit all generated packets without any difficulty asillustrated in Figure 6.23. However, as the congestion increases the PDP400Network throughput350Throughput (Kbps)30025020015010050PDPModified RBAR00 200 400 600 800 1000 1200 1400Per-flow rate (Kbps)FIGURE 6.23Throughput transmitted for varying per flow rate.
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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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Page 326 and 327: 7Distributed Fair Scheduling in Wir
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Distributed Fair Scheduling in Wire
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8Optimized Energy and Delay-Based R
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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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