Research On Protocol Algorithm Of Reprogramming For Wireless Sensor Networks With Selection Of Scope

Reprogramming for wireless sensor networks is achieved by means ofsoftware remote update through wireless communications, enables efficient networkmanagement and maintenance. This paper proposes a flat routing and a hierarchicalrouting algorithm to reprogram the heterogeneous WSN widely used in practice. Theintroduction of coordinated sleep schedule and pipelining mechanism efficientlyreduces the number of intermediate forwarding nodes and saves energy consumption.The contents and results of this paper can be summarized as follows:1．Traditional ADV-REQ-DATA three handshakes protocol may cause ACKimplosion, so a reprogramming protocol (F-Route) based on flat routing withselection of scope is proposed.(1) F-Route contains routing creation, code dissemination and requesting missedpackets three stages. Intermediate nodes transmit updated code to targeted nodesthrough unicast or multicast, decreases the REQ messages, and saves energyconsumption efficiently.(2) F-Route counts homogeneous and heterogeneous nodes which forward thepackets.(3) The performance analysis and simulation experiments indicate that, averagedelay and energy consumption in F-Route drops12.3%and14.1%approximatelycompared with similar protocol Aqueduct.2．Traditional network reprogramming protocols and F-Route do not considerfully about node’s residual energy, and traditional hierarchical routing protocols cannot selectively reprogram WSN. So an energy-efficient reprogramming protocol (H-Route) based on hierarchical routing with selection of scope is proposed.(1) Based on the application that needs to be updated, node’s residual energy,effective degree and link quality, H-Route selects subset nodes in the network as corenodes to create a hierarchical routing. (2) H-Route employs a two phase approach, in which the software image isdelivered to the core nodes reliably in the first phase and to the needed ordinary nodesparallelly in the second phase.H-Route introduces coordinated sleep schedule andpipelining mechanism to disseminate data quickly and save enery consumption.(3) The performance analysis and simulation experiments indicate that, thoughH-Route has the almost same average delay with similar protocol CORD, its energyconsumption is21.6%less than CORD’s.