Research On Adaptive MAC Protocol Of WSN Based On Event-Driven

WSN is deployed in monitoring area of large amounts of data acquisition,processing and communication function and the integration of micro sensor nodes of a new type of wireless network,because of its flexible networking and dynamic topology and not need to be fixed infrastructure support,low cost,etc is widely used in military and national security,environmental science,traffic management,anti-terrorist peacekeeping,disaster forecast,intelligence in the fields of urban construction and cause the military departments,industry and academic institutions.Sensor nodes usually adopt button battery or batteries to provide energy,so the node energy is very limited.WSN is often a layout in some personnel cannot reach the bad environment,so the node energy supply is difficult.Therefore,through effective design save node energy loss and to prolong the period of the network has become an important research content to WSN.In this paper,aiming at the characteristics of WSN energy co.,LTD.,based on event-driven and the Quorum of WSN are studied adaptive scheduling mechanism,main innovative work is as follows:(1)Through research based on fixed allocation based on competition and the advantages and disadvantages of wireless sensor network MAC protocol,proposed hybrid method based on both advantages and reduce its shortcomings.Nodes use competitive way to obtain channel,introducing the Grid Quorum system,reduce competition channel number of nodes at the same time,to send data to reduce the probability of collision;Then by dynamically adjusting the Grid Quorum of cycle length,improve the distribution of the fixed time slot with the shortcoming of fixed duty cycle.(2)For asynchronous sensor nodes because of the cyclical dormancy neighbor found difficult problem.Combined with the advantages and disadvantages of the existing asynchronous neighbor discovery algorithm,is proposed based on combination of a Quorum and the Chinese remainder theorem of prime Grid Quorum to allocate time slots.Through the use of the prime network is not empty and cross,guarantee the connectivity of the network.(3)For other MAC protocol of wireless sensor network(WSN),control information too much lead to problem that increased energy consumption and low channel utilization,used a more ways to save energy,the field data in MAC protocols structure reasonable setting,finally according to the characteristics of the cluster head node and ordinary node,design a fast dormancy mechanism and greed mode to achieve the goal of high efficiency energy saving.This article will combine based on competition and the advantages and disadvantages of the MAC protocol based on fixed allocation,proposes a new kind of hybrid MAC protocol,by introducing a Quorum system,put forward the method of adaptive network load,at last,through the improved CCA finish asynchronous neighbor found that combining the frame structure and the design of data structure,and the common nodes and the cluster head nodes respectively to design reasonable data exchange strategy,complete the nodes and efficient data delivery.