By Lawrence Harte
This consultant explains the evolution and services of cellular cell applied sciences, prone, and functions from first new release analog, via moment new release electronic, to high-speed 3rd iteration electronic broadband.
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Extra resources for Introduction To Mobile Telephone Systems: 1G, 2G, 2.5G, and 3G Wireless Technologies and Services
2. 3. 4. 5. 6. 7. indd 40 12/31/2007 12:35:18 PM Applications of WSANs 41 8. Global, or local or absent network node address 9. Strong, or weak, or absent data processing capabilities Clearly such features can significantly influence the selection of communication protocols and algorithms at the various air interfaces. To clarify, let us consider the interface between levels 1 and 2 (basically, between sinks and sensor or actuator nodes): 1. Whether the nodes are mobile or still has an influence over the physical layer, since some modulation/demodulation schemes suffer more than others the effects of moving link ends; moreover, if node move, the topology of nodes can be highly dynamical and therefore suitable topology maintenance protocols must be implemented.
The network coverage is related to the sensing range of nodes and the event type. Moreover, distributed localization algorithms could be used to identify the exact position in which the event occurs. The report can be received by the sink(s) with given probability; connectivity issues, related to transmission range of nodes, must be kept under control and the communication protocols must be designed so that the alarm arrives at the sink(s) with a high probability and in a short time. indd 32 12/31/2007 12:35:18 PM Applications of WSANs 33 In case the sink(s) periodically queries the nodes, the frequency of queries must be chosen so that the event is detected with a given probability and must also ensure that the reports reach the final sink(s) in time.
If the location of targets to be tracked must be continuously monitored, then tracking is an application of PE type, where the process to be estimated is given by the position of the object in the space, mathematically represented by a moving impulse. ), then the application is of ED type. In the following, the scenarios identified above are assigned to either ED and/or PE types. Since the two classes are characterized by defined sets of requirements, this categorization will help in defining the main types of requirements that will drive the network design.