The Design And Transplant Of Layered Multiple-hop MESH-LEACH

Wireless sensor networks is a new platform for information access by the random distribution of the tiny nodes which the integrated sensors, data processing unit and wireless communication module through self-organized way. It can monitor in the environment, collect information and remote release to users real-time. Routing protocol, which aimed to solve the problem of data transmission across the networks, is one of the core technologies and its performance is closely related to the entire wireless sensor network. Because the application background of wireless sensor networks is very different, the wireless sensor network routing protocol design should be closely related with the application background. This paper analyzes some existing typical routing protocols. Integrated their advantages and disadvantages, this paper presents a new routing protocol——MESH-LEACH to adapt to large-scale network. On the basis of simulation, this paper details the routing protocol transplant in Parking Guidance System. In addition, this papers test MESH-LEACH protocol running in Parking Guidance System and it achieved detection of 215 parking spaces successfully.This paper first introduces the concept, characteristics, network architecture and key technologies of wireless sensor networks, on the basis of present and analyze the advantages and disadvantages of some existing typical routing algorithm, this paper chooses a hierarchical clustering routing algorithm LEACH as a research focus, according to the energy model of wireless sensor networks this paper analysis the value of the cluster head problem. Then we simulated the LEACH algorithm at different values of cluster head probability on MATLAB simulation platform, compared with theoretical results, the paper proposed the optimal cluster head probability value. According to analysis the result, it proposes the improved algorithm, and then simulates the algorithm again.This paper also studied the MESH network. It described the characteristics of the MESH network, and the analyzed the MESH routing performance, combined with the advantages and disadvantages LEACH and MESH, proposed a data-centric hierarchical routing algorithm MESH-LEACH, which appropriately solved LEACH's shortcoming for wireless sensor networks in large-scale problems in the application.This paper focuses on design MESH-LEACH protocol's transplant in Parking Guidance System. Taking each detector as a sensor network node, formed the cluster by LEACH algorithm, and then introduced of backbone routing BB, composed MESH network by a certain routing policy, finally converge parking information at SINK node. This routing protocol design based on Parking Guidance System including the super-frame design, synchronous design, the address frequency allocation design, Super-frame scheduling design, code process design, SINK data processing flow, CSMA/CA algorithm and so on. At last, MESH-LEACH achieved successful transplant on the hardware platform, and successfully applied to a seven-floors parking guidance system to achieve 215 parking Guidance.