The rest of this
chapter is organized as follows: we overview the location service problem and
di?®erent protocols to solve it from the view of the quorum method in Section
2; Section 3 discusses the information dissemination problem and focuses on
the employment of quorum-based method protocols combined with negotiation.
Its performance is shown through mathematical analysis and simulation
comparison. One of the major applications of wireless sensor networks??”object
tracking is discussed in Section 4. If we combine the frequency of object detection
and request with the consideration of di?®erent quorum size, minor
modification of the quorum-based method can receive even better results.
Conclusion about this chapter is made in Section 5.
2 Location Service
There are two classes of protocols that deal with the routings among nodes,
topology-based and position-based [6]. Since nodes may easily die out by running
out of energy or moving out of their original place, the topology of sensor
networks is changed frequently. Therefore position-based routing is introduced
to eliminate these deficiencies. The first issue to address in the position-based
routing is location service. A location tracking mechanism is essential for updating
and retrieving location information about nodes to establish connections
before data is routed. Nevertheless, because of the limitation of power
and hardware capability, sensors will be exhausted if they maintain tables for
the locations of all the other nodes.
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