Analysis And Research Of WSN Routing Protocol In TinyOS

Wireless Sensor networks(WSN), which is made by four major of sensor, embedded computing, networking and wireless communication technologies, is a new information acquisiton and processing technology. It is a new wireless networks , and can collaborate in real-time monitoring, sensing and collecting objects of various environmental or monitoring of information,and processed and sent information to the users. This paper study a suitable data acquisition network routing protocols based on the basic WSN routing algorithm to detect the temperature of a region in real-time.This dissertation briefly introduces the conception of WSN, the structure of the network, some characteristics and key technology. Wireless sensor network architecture is different from the existing LAN or the Internet. It generally composed of communication protocols, network management and application support technology. Being similar with TCP / IP protocol architecture, WSN is also consistent with the structure of OSI model, but the structure of the the existing agreements is difficult to apply to wireless sensor networks. It is need to develop separately.Routing protocol is more crucial part of wireless sensor network layer, and it plays an important role in entire organization and structure. It not only affects the network connectivity, but also affects the effectiveness and survival. A good routing protocol, consume not only less resources, but also less energy.Then the paper makes a comparison of several kinds of existing protocols, studies the LEPS(Link Estimation and Parent Selection),and analyzes the critical modules. LEPS routing sets up a Tree topology based on one convergence node as the root node, each node sends data to its father node and uses the shortest way to send it to the convergence node. LEPS protocol uses the number of jumps and the quality of link as the basis of choosing a father node, and has a certain guarantee transmission reliability. This dissertation analyzed the theorem of LEPS and the implementation method of simulating in TinyOS.LEPS is TinyOS's multiroute protocol which is suitable for data-gathering sensor network. TinyOS is a type of embedded operating system designed specially for WSN. Its Active Message Communication Mode, component module and process dispatching are all excellent for the application of WSN. TinyOS uses nesC which is a language expanded from C.At the end I simulates LEPS in TinyViz. TOSSIM is a discrete event simulators. NesC procedures for simulation in TOSSIM has the following characteristics : to achieve simulation in bit-data, hardware abstraction, convenience, only the mica node on the network protocol simulation. TOSSIM provides a graphical debugging process Tinyviz, Inputting commands through a command line to connect Simulation program TOSSIM with TinyViz, then you can conduct the simulation.In WSN, LEPS routing protocol can establishes and maintains a tree topology, but the links between nodes are not stable, and topological changes are frequent. .This paper brings up a modified LEACH protocol which is based on the LEPS protocol, combined with LEACH protocol hierarchy, and considered with the energy and regional factors. And the important idea of the modified protocol is choosing the cluster head in the way of local self-government election. Since all the nodes are in the local low-power and small-radius communicated with each other, so that to avoid long-distance transmission, and also to avoid the two neighboring strong cluster nodes at the same time being cluster heads, which will result in the case of dense cluster heads in a region.Finally, in the TinyOS operating system, the routing module is replaced by the modified LEACH protocol, and I have do some experimental tests. In the case of a smaller number of nodes in the network, the routing function can be realized and the clustering is also based on residual energy. The cluster heads also distribute equaliy in the region.