By R. Jurdak
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Additional info for Wireless Ad Hoc and Sensor Networks
20 3 Data Link Layer MAC protocols. 4 examines the eﬀect of incorporating topology information on the MAC protocol performance. 5 assesses available power management mechanisms and their suitability for particular channel access methods and topologies. 6 evaluates the scalability and performance of MAC protocol design choices. 8 oﬀers a roundup of ad hoc and sensor network MAC issues and derives guidelines for creating a more generalized protocol that is suitable for several physical-layer technologies and applications.
A central base station determines the status of each slot in the next frame and announces the successful reservations for the upcoming frame. Finally, MACAW assumes that there are several ﬁxed base stations connected with a wired network. Ad hoc and sensor networks generally do not adopt a centralized topology, since by deﬁnition they are infrastructureless. However, these protocols provide valuable concepts such as a busy tone channel and time slot reservation which are extendable to ad hoc and sensor networks.
In these protocols, nodes typically need to monitor diﬀerent channels for availability, or to adopt a greedy approach in grabbing channels. Monitoring channels dictates that the node’s transceiver is frequently active thus wasting more power. In a greedy approach, the chance of conﬂicts and collisions is increased since a node tries to grab channels that may already be used. A clustered topology typically reduces the chance of conﬂicts by limiting the number of nodes contending for channels and by assigning a portion of the control tasks to a cluster head.