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9.5 CONCLUSION Wireless sensor networks (WSNs) have attracted lots of attention in recent years due to their potential in many applications such as border protection and combat eld surveillance. Given the criticality of such applications, maintaining a dependable operation of the network is a fundamental objective. However, the resourceconstrained nature of sensor nodes and the ad hoc formation of the network, often coupled with an unattended deployment, pose nonconventional challenges and motivate the need for special techniques for dependable design and management of WSNs. In this chapter, we have discussed the effect node placement strategies on the dependability of WSNs. We categorized the various approaches in the literature on sensor and base-station positioning for enhanced dependability. We have further highlighted the potential of dynamic repositioning of the base-station and sensor nodes, as a viable means for increasing the dependability of WSNs. Unlike the initial careful placement, node repositioning can assist in dealing with dynamic variations in the network resources and surrounding environment. We have identi ed the technical issues pertaining to relocating the nodes namely, when to reposition a node, where to move it, and how to manage the network while the node is in motion. We have discussed sample techniques that employ sensor and base-station relocation for boosting the coverage, tolerating node failure, extending network lifetime, increasing responsiveness in data delivery, and protecting the network assets. We have further identi ed the coordinated multinode repositioning problem as an open area for research.

If the new task is less urgent, it is simply placed on a list of pending tasks the ready list When a task completes execution or waits for an external event to occur, it is suspended and control is passed to the most urgent task on the ready list Note that when control is passed from one task to another, the operating system automatically saves the state of the old task so that it can resume it later Thus the operating system effectively does the partitioning of tasks into smaller pieces for you and so tasks can simply be written as a single unit Adding a new task is simple; all that you have to do is to assign it a priority and check that the system can still be scheduled correctly with the new task included (in the sense that each task completes within its deadline).

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9.6 EXERCISES 1. List some examples of sensor network applications and enumerate the dependability requirements that these applications are subject to. Discuss how node placement affects the network dependability attributes in the context of these applications. 2. What are the most important metrics to be considered in performing sensor relocation Discuss possible tradeoffs among these metrics. 3. When would dynamic node placement be most appropriate 4. How would the communication range of relay and sensor nodes affect the complexity and placement strategy of relay nodes 5. Describe some scenarios for which dynamic placement of nodes can hurt the network performance rather than enhancing it.

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Similarly, an increase in the execution time of any task doesn t require any extra work rearranging the schedule, just a check that the system can still be scheduled correctly Task periods don t have to be integer multiples of each other each task simply runs when it needs to Similarly, sporadic tasks are not a problem they only use processor time when they actually run Preemptive scheduling also deals with non-real time tasks; these are simply placed at the bottom of the ordering and so they run whenever no time critical tasks need the processor Preemptive scheduling solves the major problems of cyclic scheduling However it brings some problems of its own: Resource sharing.

6. Based on the analysis and deployment techniques discussed in this chapter, how would you design a sensor network for the following applications (i) Underwater surveillance, (ii) Border protection, and (iii) Lunar exploration. 7. Pick a randomly deployed sensor network with ve nodes. Show the nal con guration of the sensor network after applying the Voronoi-based sensor relocation (VOR) technique of reference 48. 8. Discuss the relation between network clustering and the multiple base-station placement problems. How would the order of applying the clustering and placement techniques affect the network design/performance

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Since tasks are started and stopped automatically by the OS it is possible that they will contend for use of a shared resource It is more dif cult to check that a set of tasks can be scheduled correctly..

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