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For example, the following questions need to be answered in the optimal schedule: when to switch to sleep mode, how long to stay in sleeping state, how a node can send or receive signaling message when in sleeping state, and so on Moreover, power management involves many challenging problems for the upper layers For example, since there always exists a subset of nodes in any region, traditional broadcasting and multipath routing protocols would not work ef ciently in such environment Thus, either of these routing protocols are redesigned to adjust to such a situation, or the power management scheme is carefully designed take into account these considerations Another interesting problem is the tradeoff between energy conservation by power management and network performance Because the network can only make use of a subset of nodes at any time, packet delay is inevitably increased.

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characteristics in free space is modeled as 1/d 2 , whereas in terrestrial conditions it is determined as 1/d , where 25 < < 45 depending on the terrain and other environmental factors [7] The path loss factor may be obtained experimentally for the speci c environment where it is to be used This is often a cost-effective method for distance estimation r Time of Flight: A useful technique for determining the distance between an RF transmitter and a receiver is to measure the time taken for the RF signal to cover the distance Here, a receiver measures the time of arrival (ToA) of a signal transmitted from reference point to compute the distance using the velocity of propagation of the signal This requires the receiver to have accurate time synchronization with the transmitter, which is often hard to implement.

How to strike a balance between them in power management is a critical issue to the application of power management in ad hoc networks..

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An alternative is use an additional transmitter to act as a frame of reference, where the receiver estimates the time differences of arrivals (TDoA) between signals from multiple transmitters to determine distances These distances can be used for localization using multilateration Such a technique is fairly accurate when the distances involved are long, such as between a ground-based receiver and a system of satellites orbiting the earth, as used in GPS However, distance ranging from time of ight is hard to implement for short distances because RF signals propagate in the speed of light and it requires extremely accurate hardware to detect small time differences 1222 Mechanisms for Estimating Angles Most of the earlier methods for angle estimation were based on optical methods, such as determining the direction of stars for air and sea navigation.

11.6 CONCLUSIONS Since power control has a signi cant impact on the functionalities in layers of the protocol stack in wireless ad hoc networks, it is a prototypical example of cross-layer design for wireless networks. Power control can reduce transmit power level (and hence gain energy conservation) and performance (e.g., throughput, delay) improvement by alleviating the congestion of wireless medium. There are many approaches to obtain the above bene ts with power control. In this survey, we rst distill some

Some of the more technologically advanced methods for angle estimation are as follows: r Use of Directional Antennas Large phased-array antennas have gain patterns that can be suf ciently directional to allow determination of the angle of arrival of an RF signal This technique was proposed and evaluated in reference 8 for designing a system for tracking the locations of transportation vehicles It used rotating directional antennas in each vehicle to determine the angles of arrival of RF signals from xed base stations for localization However, even the most expensive phased array antennas can produce errors in angle estimation, which is the primary drawback of the system It also involves complex and bulky instrumentation (rotating directional antenna arrays) at the receiver r Use of Angular Signatures Another example of localization using angulation is the VHS omnidirectional ranging or VOR systems that are used for aircraft navigation.

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Here, speci c RF signals are transmitted from ground-based VOR stations that allow receivers on ying aircrafts to determine the angles from the stations [9] A simple implementation of this idea involves a combination of periodic transmissions of bursts of an omnidirectional signal along with a continuously rotating beam emitted from the VOR station A receiving aircraft can determine the angular orientation with respect to the VOR station from the.

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