Service-Oriented Sensor-Actuator Networks

ion Type of Application Off-Network In-Network Services Awareness Optimization Optimization [34] Node services In-network No No √ [94] Jini Services Off-network No √ No [50] Web services Off-network No No No [118] Web services Off-network √ √ No [95] Node services In-network No No No [26] Node Web services In-network √ No No [38] Web services Off-network No No No [48] .NET components Off-network √ √ No [56] OSGi-based services Off-network No No No [87] Ad hoc In-network No No √ [47] Ad hoc In-network √ √ No [72] Objects In,Off-network √ √ No TinySOA Node services In-network √ √ √ Table 3.1: TinySOA vs. Other Service-Oriented Systems associate a single service invocation with several queries. An example of the latter is TinySOA’s SARP protocol discussed in Chapter 4. – Off-Network Service-based Optimization: From the perspective of TinySOA’s clients (e.g. base station, mobile user), TinySOA streams query results in similar ways than existing sensor systems. Traditional off-network optimization techniques (caching, query rewriting, reprocessing previous results to answer new queries, etc.) are also applicable in the context of TinySOA. • Application Independence and Application Awareness: Application awareness refers to the ability to exploit the specific characteristics of a given application to improve the overall efficiency of the network. Several prior efforts have proposed application-aware solutions. However, these solutions are often too specific to the considered class of applications. In contrast, TinySOA expose “neutral” services that any application may use with the same efficiency expectations. TinySOA is therefore application independent while it is still able to exploit any specific characteristics of a given application. A. Rezgui Chapter 3. Service-Oriented Query Model and Architecture for SANETs 67 Table 3.1 summarizes the recent and ongoing research that investigates the concept of services in the context of sensor networks. It also compares TinySOA to other service-oriented sensor systems. In the Abstraction column of the table, the term node services refers to a software module running on sensor nodes. Web services refer to cases where the service is Webaccessible through standards such as XML. Node Web services refer to cases where the service is both hosted on sensor nodes and Web-accessible.