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or-defer on/off collision avoidance model of CSMA/CA The power control component in PCMA has two main mechanisms: r A request-power-to-send (RPTS)/acceptable-power-to-send (APTS) handshake between sender and receiver is used to determine the minimum transmit power level required for successful packet transmission The RPTS/APTS handshake occurs in the data channel and precedes the data transmission r The noise tolerance advertisement is used by each active receiver to advertise the maximum addtional noise it can tolerate, given its current received signal and noise power level The noise tolerance advertisement is periodically pulsed in the busy tone channel, where the signal strength of the pulse indicates the tolerance to additional noise In PCMA, a potential transmitter rst senses the carrier by listening to the busy tone channel for a minimum time period to determine the upper bound of its transmit power for all control (RPTS, APTS, ACK) and DATA packets.

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11.3 POSITION COMPUTATION When a node has enough information of distances and/or angles and positions, it can compute its own position using one of the methods that will be studied in this section. Several methods can be used to compute the position of a node. Such methods includes trilateration, multilateration, triangulation, probabilistic approaches, bounding box, and the central position. The choice of which method to use also impacts the nal performance of the localization system. Such a choice depends on the available

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By reducing the transmission power, more concurrent transmission are allowed; hence the spatial reuse of wireless medium increases PCMA works effectively in terms of energy conservation while increasing the network throughput Results show that PCMA can improve the throughput performance by more than a factor of 2 compared to the IEEE 80211 for highly dense networks Similar to PCMA, reference 39 also combines the mechanism of power control, RTS/CTS handshake and busy tones to increase the channel utilization while saving energy The main difference is that reference 8 introduces interference margin (noise tolerance), which can help to admit more concurrent transmissions This is a tradeoff between throughput and energy consumption The larger the interference margin, the larger the number of simultaneous transmissions allowed, but also the larger the transmission power In PCMA, the interference margin is advertised by the receiver over the separate busy tone channel PCDC.

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TABLE 11.2. Comparison of the Methods Used to Estimate Distances/Angles Between Two Nodesa Method RSSI Precision Meters (2 4 m) Maximum Distance Communication range Communication range few meters (2 10 m) Communication range Communication range Extra Hardware None Challenges Variation of the RSSI, interferences Nodes synchronization Maximum distance of work Work on small sensor nodes

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To avoid using busy tone channel to locally broadcast the interference margin used in reference 8, The Power-Controlled Dual Channel (PCDC) Medium Access Protocol [37] advertises this value by RTS and CTS control packets, which are transmitted on a separate control channel In addition, to further increase the spatial reuse and provide better protection of ACK packets, reference 37 proposes the use of subcontrol channel for transmitting ACK messages Simulation results show that PCDC achieves improvements of up to 240% in channel utilization and over 60% in throughput, along with a reduction of over 50% in energy consumption Moreover, PCDC is the rst one that utilize the interplay between MAC layer and network layer to provide an ef cient and comprehensive solution to power control problems By controlling the transmit power of RREQ packets, the MAC layer can effectively control the set of candidate next-hop nodes in route discovery.

Centimeters (2 3 cm) TDoA Centimeters (2 3 cm) AoA A few degrees (5 ) Communication Half the Range communication range

PCDC maintains a connectivity set (CS) for each node Any node in the set cannot nd an indirect route that consumes less energy than direct communication Thus, if the connectivity sets of all nodes can maintain the network connectivity, power-ef cient routes can be found with nodes only in the connectivity sets PCDC proposes a distributed algorithm.

information and on the processor limitations. In the subsequent sections, the cited methods will be studied. After that, some general comments will be made regarding this component and its methods. 11.3.1 Trilateration and Multilateration Trilateration is the most basic and intuitive method. This method computes a node position by the intersection of three circles, as depicted in Figure 11.6. To estimate

Figure 11.6. Theoretical model of the trilateration: The position of the unknown node corresponds to the intersection of the three circles formed by the positions and distances to the reference nodes.

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