Simulation Research On LLN Oriented Publish Subscribe System

Low-Power and Lossy Networks (LLN) routers typically operate with constraints onprocessing power, memory, andenergy (battery power). Their interconnects arecharacterized by high loss rates, low data rates, and instability.Information dissemination isan important content in lossy networks with low power consumption, and publish/subscribe system is one of the participants in the distributed system, to publish/subscribeway to interact with middleware system, in line with the characteristics of decentralizedcontrol, dynamic, autonomous and loosely coupled, can be a low power loss network toprovide a good platform of communication and interaction.Publish subscribe technologyfor LLN research.This paper selects a typical low power loss network protocol--6LoWPAN protocolwas introduced, on the basis of this, the RPL (Routing Protocol for LLN) routing protocolsare introduced, and then, with the examples of RPL routing protocol to use3kinds ofcontrol messages, topology, routing and down to up routing. At the same time, background,main characteristics and types of publish subscribe system are described in this paper, thepublish/subscribe systems, content based content in their attribute values can be expressedmeaning, types, characteristics, content based publish subscribe systems will become astructure of asynchronous, large-scale, distributed application system by the one of thepopular infrastructure. The publish/subscribe way to add to the low power loss in thenetwork, and the two effective fusion, thus forming a new communication paradigm, thepurpose is to solve the low power consumption data transmission network of high loss rate,low data rate and instability problems.Finally, based on the NS3simulation platform, the low power consumption of publishsubscribe system network to carry on the modeling and simulation. In this paper, differentdistance between neighbor nodes different maximum transmission rate and transmissionpower condition three performance index number data transmission distance, speed and theretransmission of the new communication model of the simulation. The simulation resultsshow that the publish/subscribe system for LLN have been realized, can significantlyimprove the data transmission performance of LLN. Further indicates that the publishernode subscription system has a data cache, interest and receiving data function, can effectively solve the lossy network link easily damaged influence data transmissionproblem of low power consumption, reduce the data loss rate, improve the datatransmission rate and stability.