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The sink current site E is indicated by a triangle The squares A, B, C, D, F , G, H, and I identify the adjacent sink sites The gure shows what happens upon ooding the route construction message Potential sentinels for sink site G are marked as black circles Their distance from G is less than or equal to the node transmission range When such potential sentinels receive the ooded message, they answer back to the sink, identifying themselves as candidates It is the sink that selects the (single) sentinel for a given possible future site Second Phase At the time the sink has to decide whether to move or not, it interrogates the selected sentinels about the residual energy at their sites by sending them a (small) packet.

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Figure 10.10. The functionality of Split TCP over an 11-hop string topology featuring an inter-proxy distance of 4.

At this time the sentinels query their neighboring sensor nodes about their residual energy and communicate back to the sink the minimum of the obtained values or any suitable function that can express how critical (for the network lifetime) it is to place the sink in that area This information enables the sink to select the next site, depending on the residual energy of its area..

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the proxies, which places extra computational demands on these forwarding nodes. This latter requirement may place a strain on the (already limited) power reserves of mobile devices. Disabling RTS/CTS for Short Segments. In the 802.11 protocol, the exchange of unicast messages is conducted at the link layer, rst with an RTS/CTS handshake and then with a DATA-ACK exchange [4]. The Request to Send/Clear to Send (RTS/CTS) exchange is a bilateral point-to-point transmission between successive nodes along a path to reserve the space around the nodes, avoiding the hidden and exposed terminal effects [4]. The DATA/ACK exchange at the link layer is an attempt to ensure reliable delivery of DATA on a point-to-point basis, although there is a limit to such efforts before the link layer gives up and drops the frame 2 ; speci cally up to four retries for DATA and seven times for RTS frames are attempted.3 Figure 10.11 illustrates the principles of the RTS/CTS exchange. In Figure 10.11a the source and destination nodes communicate by a simple DATA/ACK exchange, as denoted by instances 1 and 2. The source node senses the channel to determine if there are ongoing transmissions, in which case it defers its own until such time as there are no more transmissions occurring. Assuming similar transceivers and signal propagation conditions, the source can only be certain that there are no transmissions within its sensing range (the reserved area denoted by the shaded section in Figure 10.11a). However, nodes transmitting within the nonreserved area may interfere with the source s signal because they have no means of detecting the source s transmission and thus will not defer in turn. The RTS/CTS exchange solves this issue as shown in Figure 10.11b. The usual DATA/ACK transmissions in instances 3 and 4, respectively, are preceded by an RTS

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10.5.3 Multihop Routing and Uncontrolled Mobility The mathematical model and the distributed heuristic (GMRE) are clear examples of controlled mobility: The sink moves, or attempts to move, toward network locations where nodal energy is available. For the sake of benchmarking, it is interesting also to compare controlled mobility and especially the more realistic, distributed GMRE with a simple protocol for sink mobility that captures the case of uncontrolled, random mobility (RM) ` of the sink a la data MULEs. The difference here is that routing from the sensors to the sink is multihop. The heuristic is extremely simple: Every tmin the sink selects randomly and uniformly the new location among all the sites within distance dmax from the current. In case a site different from the current is selected, the sink moves to that site. We observe that even in this case, where the sink does not necessarily move to areas with high residual energy, improvements in network lifetime are obtained with respect to the case with an optimally placed static sink. There are cases where the mobility, although neither random nor controlled by the network, can be exploited to improve network lifetime. Luo and Hubaux [56] successfully demonstrate this by simply moving the sink around the deployment area. Speci cally, by searching the space of all possible sink mobility strategies that are periodic (recurrent sink movements within a constant period), the authors claim that a good mobility strategy is obtained by having the sink traveling at the periphery of the network. While controlled, the sink movements are not guided by the network situation/activities.

term frame is employed here when discussing issues related to Link/MAC layer messages as per IEEE practice [4]. number of retries for segment retransmission are de ned by the dot11ShortRetryLimit and dot11LongRetryLimit variables in the IEEE 802.11 speci cation.

Inspired by the solution by Luo and Hubaux, we devise a mobility strategy, termed Perimeter Mobility (PM). According to PM, the sink visits cyclically the sites along the perimeter of the (square) deployment area. It stays at each site for tmin and then moves onto the next site in a counterclockwise fashion. It makes sense to compare this different cases of controlled and uncontrolled mobility, evaluating which solution performs more vigorously with respect to selected metrics. This is the natural next step: After having discussed different types of mobility and the corresponding algorithmic solutions (models and protocols), we proceed at selecting scenarios and metrics for comparing them.

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java ean 13 reader

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