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design principles that can serve as a guide to the design of the power control problem based on the impacts of power control on different layers. Then we address the power control problem in a single layer. The basic idea is intuitively given, and also several algorithms are introduced. Then we address the power control problem in a systematic approach, motivated by the principle that cross-layer design should be tackled holistically. Finally we consider the power control problem in a totally different perspective. We study various methods combined with power control to improve energy ef ciency of wireless ad hoc networks. Power control is a good strategy to improve the network performance and conserve energy if joined with other approaches. Though there are many works that follow this methodology, research is still needed to further exploit its bene ts, and some interesting and critical open issues are given in each section.

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observed time difference between the ash and the rotating beam. The combination of angles estimated from two VOR stations and their locations can be used to determine the position of the aircraft.

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11.7 EXERCISES 1. Brie y explain why power control can affect the congestion level of the wireless medium, and propose methods to alleviate the congestion level with power control under different load conditions. 2. Describe the differences between contention-based medium access control schemes and interference-limited medium access control schemes. 3. In the so-called BASIC schemes, there are two methods to compute the minimum necessary transmit power for data packet delivery. Compare the pros and cons of both methods. 4. BASIC schemes are designed to conserve energy of wireless devices. However, in some wireless ad hoc network scenarios, BASIC schemes cannot achieve this goal and may even increase the energy consumption instead. Explain why this can happen, and illustrate with one such scenario. 5. Explain why PCM can reduce the potential collisions caused by BASIC schemes. 6. Give a scenario where the hidden terminal problem still exists in POWMAC schemes. 7. Explain why power control can affect functionalities at the network layer. 8. In the COMPOW scheme, nodes choose a common power level. However, this may decrease the performance of wireless ad hoc networks under certain scenarios. Illustrate this behavior with an example. 9. Brie y explain the interaction between power control and congestion control in JOCP algorithm. 10. List the metrics used for energy-aware routing algorithms.

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123 ISSUES ON LOCALIZATION IN SENSOR NETWORKS With these ideas on location discovery methods, we now turn our attention to the special requirements and issues for location discovery in sensor networks In most cases, sensor network applications require that the wireless sensor nodes are deployed randomly in an area of interest Applications may also require sensor nodes to be deployed by dropping them from ying aircrafts and requiring the nodes to selfcon gure into a wireless network Because of such deployment methods and the large number of nodes involved, special techniques are required for the nodes to determine their locations after deployment Why Not GPS Although GPS receivers have evolved to become smaller in size, cheaper, and accurate, several reasons prohibit the use of GPS in most sensor network applications Firstly, GPS requires the receiver to receive data from four or more satellites for functioning.

1 V Kawadia and P R Kumar Principles and protocols for power control in wireless ad hoc networks IEEE Journal on Selected Areas in Communications, 23(1):65 75, 2005 2 S Agarwal, S Krishnamurthy, R H Katz, and S K Dao Distributed power control in ad-hoc wireless networks In Proceedings of PIMRC, 2001 3 J Gomez, A T Campbell, M Naghshineh, and C Bisdikian Conserving transmission power in wireless ad hoc networks In Proceedings of IEEE ICNP, 2001 4 P Karn MACA A New Channel Access Method for Packet Radio In Proceedings of 9th ARRL Computer Networking Conference, 1990 5 M B Pursley, H B Russell, and J S Wysocarski Energy-ef cient transmission and routing protocols for wireless multiple-hop networks and spread-spectrum radios In Proceedings of EUROCOMM, 2000, pp 1 5 6 E-S Jung and N H Vaidya A power control MAC protocol for ad hoc networks.

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This is not possible in indoor environments or in locations where foliage and other cover obstructs satellite signals Secondly, limitations of size, battery, and hardware resources of sensor nodes is prohibitive for using GPS hardware in every node This is particularly true for wireless sensor nodes of the future, which are envisioned to be of the size of a few cubic millimeters [10] Thirdly, the addition of GPS hardware would make sensor nodes costly, which clashes with one of the design objectives of sensor nodes Finally, in most applications of wireless sensor networks, only relative locations of the nodes are needed and not their absolute geographical positions Hence, a GPS device is considered as an overkill in terms of cost and hardware requirements for applications involving wireless sensor nodes 123.

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java ean 13 reader

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