4.3.1. Node heterogeneitySG is conceived as a blend of communications technologies interconnecting various devices of different types,from common networking technologies such as computers,routers, switches to smart meters, home appliances, sensors, synchrophasors, and EVs. The data generated fromthese nodes will have different requirements in terms ofrouting and thus this may lead to different type of service(ToS) requirements for each type of data. Furthermore,each of these devices will have different hardware restrictions in terms of CPU, memory, battery or storage and thusrouting protocol should consider these resource requirements as well. In addition to common resource variationssuch as in computation capability, storage capacity, andenergy supply; a node in SG could be equipped withmultiple interfaces instead of a single interface in orderto exploit heterogeneous communications technologyenvironments (i.e., multiple radios, channels). Such additional interface will affect the design of the routing protocol by providing alternative routes. These issues can beaddressed by clustering the similar devices under anetwork and using different standards/protocols based onthe cluster’s needs. This is also related to interoperabilitywhich is discussed next.
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