Self Organizing MAC for Sensor Networks SMACS and Eavesdrop and Register EAR Algorithms

Self-organizing MAC for sensor networks (SMACS) is designed for network startup and link layer organization in a static WSN [17]; it is one of the earliest attempts to develop MAC protocols for sensor networks. In this scheme, each node maintains a TDMA frame in which the node schedules different time slots to communicate with its known neighbors. During each time slot, it only talks to one neighbor. To avoid interference between adjacent links, the protocol uses different frequency channels (FDMA) or spread spectrum codes (CDMA). Although the frame structure is similar to a typical TDMA frame, it does not prevent two interfering nodes from accessing the medium at the same time. The actual multiple access is accomplished by FDMA or CDMA.

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