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Many of these aspects are con icting, so that different MAC algorithms have been de ned according to the speci c purposes of the network A rst, rough classi cation of the MAC mechanisms is in two categories: random access and deterministic access The random access algorithms are based on a medium contention policy and on a carrier sensing mechanism Such mechanisms achieve good performance in the case of wide and dynamic networks, since they do not require synchronization among the nodes and they make use of local topology information only Therefore, random access mechanisms gain in exibility, to the detriment of energy-ef ciency The deterministic access algorithms are based on a time division mechanism (TDMA) that enables each node to transmit on a different time slot.

Gilbert Lake in Jersey County, Illinois (26 km from the river s con uence with the Mississippi River), a population that had consisted of 50 owering individuals in 1992 increased to more than 20,000 individuals in 1994 (Smith, 1995; Smith et al, 1998) Because of the long duration of the ood, no individuals were present at the site in 1993; therefore, the increase in population size must be attributed to seedling establishment Whether seedlings were generated from the soil seed bank or from seeds brought in by oodwaters is uncertain; however, given the severe scouring that occurred at Gilbert Lake during the ood that removed much of the topsoil that might have held a seed bank (Smith, 1995), it is likely that seeds washed in from some of the northern populations.

This approach can potentially achieve very high energy-ef ciency, since it makes it possible to schedule the sleeping and transmission phases of the nodes in an appropriate way and to avoid collisions On the other hand, deterministic methods are inef cient for a high number of nodes, since the time frame required to allocate all the nodes becomes excessively long Furthermore, heavy signaling is required to maintain the synchronization among the nodes In most cases, MAC protocols for WSNs are a mixture of deterministic and random access In other works there are many examples of MAC protocols for WSNs In the following, some of the most important algorithms are brie y presented, taking into account their relation with environmental monitoring applications 3431 Random Access Protocols CSMA: most of the random medium access protocols are based on the Carrier Sense Multiple Access (CSMA) strategy.

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