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Figure 10.11. Illustrating communications with the plain and RTS/CTS transmissions scheme. (a) Plain DATA/ACK exchange does not reserve the whole space around the transmitter and receiver. (b) RTS/CTS followed by a DATA/ACK exchange reserves more space around the communicating nodes.

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106 COMPARATIVE EVALUATION A fundamental part of the creation and investigation of solutions for networking consists in testing the new solutions (protocols, methods, techniques, algorithms) and comparing them We describe here the way this is usually done, giving some hints and insights on the process of evaluating the performance of a WSN Since experiments on real testbeds are costly and usually scale to a few tens of nodes, it is common to (start to) evaluate a protocol for WSNs via simulations In the attempt to consider the different layers of a WSN architecture, we use the VINT project network simulator ns2 [65] This widely used software tool allows us to consider some physical layer properties and a MAC protocol CSMA/CS-like which are typical of wireless sensor networking.

The difficult part about using the Fibonacci ratios is identifying the points of peaks and troughs.

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probe from the source which is accompanied by a CTS response from the destination. The RTS frame informs nodes within the source s transmission range that a DATA frame will follow as a transmission, while the CTS response informs nodes within the destination s transmission radius that they should withhold transmission so as not to interfere with the reception of the DATA frame from the source. The RTS and CTS frames are very small in size so as to reduce the overhead of this preamble to the real transmission. If a CTS response is not forthcoming from the destination, the source can then surmise that the destination did not receive its RTS because another transmission near the destination has interfered with its signal. Hence, the source defers its transmission to a later time. Details of this exchange in the context of the 802.11 protocol may be found in reference 4. However, previous research has revealed that enabling the RTS/CTS exchange may in fact reduce throughput and lead to unfairness if the source and destination nodes are suf ciently far apart [50]. The identifying cause for this effect is the discrepancy between a transceiver s transmission and interference ranges. Readers interested in more details should consult references 50 and 51. It should also be observed that eliminating the RTS/CTS exchange altogether is not an optimal solution because it allows for hidden and exposed terminal effects to occur, thus leading to frequent frame collisions [4].

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Concerning the protocols for mobility presented here, the rst question one is lead to investigate is about the properties of GMRE and of data MULEs mobility in a realistic, typical WSN scenario (static sensor nodes) The comparison should be about properties corresponding to relevant metrics These include node energy consumption, network lifetime, end-to-end packet latency, and probability of successfully delivering the monitored information to the sink The next natural step is that of investigating in deeper details the data MULE architecture and the case of mobility with multihop routing (GMRE, RM, and PM) with the aim of identifying the impact of varying scenarios and protocol parameters on their performance Overall, the purpose of the following sections is that of introducing the reader to a deeper understanding of the performance trends when considering different application scenarios 106.

8.1 INTRODUCTION In the last few years, there has been much research activity in mobile (wireless) ad hoc networks (MANETs). MANETs are infrastructureless, and nodes in the networks are constantly moving. In MANETs, nodes can directly communicate with each other if they enter each other s communication range. A node can terminate packets or forward packets (serve as a relay). Thus, a message traverses an ad hoc network by being relayed from one node to another, until it reaches its destination. As nodes are moving, this becomes a challenging task, since the topology of the network is in constant change. How to nd a destination, how to route to that destination, and how to ensure robust communication in the face of constant topology change are major challenges in mobile ad hoc networks. Routing in mobile ad hoc networks is a well-studied topic. To accommodate the dynamic topology of mobile ad hoc networks, an abundance of routing protocols have recently been proposed, such as OLSR [1], AODV [2], DSR [3], LAR [4], EASE [5, 6], ODMRP [7], and many others [8, 9]. For all these routing protocols, it is implicitly assumed that the network is connected and there is a contemporaneous end-to-end path between any source and destination pair. However, in a physical ad hoc network, the assumption that there is a contemporaneous end-to-end path between any source and destination pair may not be true as illustrated below. In MANETs, when nodes are in motion, links can be obstructed by intervening objects. When nodes must conserve power, links are shut down periodically. These events result in intermittent connectivity. At any given time, when no path exists between source and destination, network partition is said

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java pdf 417 reader

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java pdf 417 reader

java pdf 417 reader

java pdf 417 reader

java pdf 417 reader

java pdf 417 reader

java pdf 417 reader

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java pdf 417 reader

java pdf 417 reader

java pdf 417 reader

java pdf 417 reader

java pdf 417 reader