Dissertation > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Sensor applications

Research of MAC Protocol Based on DAG

Author ChenFang
Tutor YeLing
School Nanjing University of Posts and Telecommunications
Course Communication and Information System
Keywords Wireless sensor networks MAC protocol DAG Wake - up trigger mechanism
CLC TP212.9
Type Master's thesis
Year 2012
Downloads 16
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The IntelliSense , embedded computing , wireless communication , microprocessor technology development , the expansion of demand and people's perception of the objective physical world , to promote the rapid development of modern wireless sensor network technology . Currently , wireless sensor network technology is its unique charm to attract professionals from home and abroad , the impact of changing every aspect of human life . Wireless sensor networks have a remote self - monitoring capability, so that it can be widely used in the area of ??monitoring . In such applications, usually want the network to be able to work for as long as possible , so how to design energy-efficient MAC protocol for resource-constrained sensor nodes survive as long as possible to become an important research topic . Starting from the analysis of several classic MAC protocol , pointed out that the existing research considering the lack of load balancing and energy consumption , delay , a facultative Gu Shiyan and energy consumption of energy - saving MAC protocol , namely DAG-MAC . DAG-MAC protocol introduces a load balancing capabilities DAG structure for the goal to build a load-balancing the DAG to greatly extend the time of death of the first node , similar to D-MAC protocol and load balanced DAG the staggered scheduling mechanism , while increasing the trigger wake-up mechanism makes the sensor nodes when the load is light simply accounted frame length within 0.8% of the wake-up time listening state , enabling significant savings on the basis of guaranteeing low latency node energy ultimately to achieve the purpose of prolonging the network life . In this paper, a simulation the OMNeT platform DAG-MAC achieve and comparative analysis with the three protocols S-MAC, T-MAC -MAC . The experimental results show that the performance of load balancing DAG , DAG- MAC significantly better than the other three protocols .

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