Hybrid Report

May 5th, 2015
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Contention-based protocols results in high utilization in cases where there is low contention. However, when the number of nodes contending for the channel increases, channel utilization decreases since these nodes are not coordinated. On the other hand, contention-free protocols provide scheduled access to each node and decrease collisions.

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Hybrid ReportContention-based protocols results in high utilization in cases where there is low contention. However, when the number of nodes contending for the channel increases, channel utilization decreases since these nodes are not coordinated. On the other hand, contention-free protocols provide scheduled access to each node and decrease collisions. This results in high utilization when the competition is high but also in latency and overhead. Such a contrast produces a tradeoff between access capacity and energy efficiency. Hybrid solutions provide performance enhancements in terms of collision avoidance and energy efficiency due to improved channel organization and adaptivity to dynamic traffic load.The hybrid MAC protocol combines the strengths of contention-based and schedule-based protocols while offsetting their disadvantages, so as to behave as a dual-characteristic protocol and achieve better performance. Z-MAC. Zebra MAC (Z-MAC) is a hybrid MAC scheme, which is suitable for applications where the expected data rate and two-hop contention are medium or high. The main feature of Z-MAC is its adaptability to the level of contention in the network, so that under a l

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