REMUDA: 一个实用地无线传感网络拓扑控制和数据转发机制

In wireless sensor networks, topology control plays an important role for data forwarding efficiency in the data gathering applications. In this paper, we present a novel topology control and data forwarding mechanism called REMUDA, which is designed for a practical indoor parking lot management system. REMUDA forms a tree-based hierarchical network topology which brings as many nodes as possible to be leaf nodes and constructs a virtual cluster structure. Meanwhile, it takes the reliability, stability and path length into account in the tree construction process. Through an experiment in a network of 30 real sensor nodes, we evaluate the performance of REMUDA and compare it with LEPS which is also a practical routing protocol in TinyOS. Experiment results show that REMUDA can achieve better performance than LEPS.     

TinyOS路由协议原理及性能评估

LEPS是TinyOS的多跳路由协议，适用于数据聚集型传感器网络。LEPS路由建立一个以汇聚节点为根节点的树型拓扑，每个节点向自己的父节点发送传感数据，并沿最短路径传送到汇聚节点。LEPS协议将跳数和链路质量作为选择父节点的依据，具有一定的传输可靠性保证。该文对LEPS的原理以及在TinyOS中的实现机制进行了分析，在实际的传感器网络中进行了性能实验。LEPS路由协议可以形成并维护一个树型拓扑，但是节点间链路不够稳定，拓扑变化比较频繁。     

一种输出功率分级的无线传感网络数据收集机制

The data gathering manner of wireless sensor networks, in which data is forwarded towards the sink node, would cause the nodes near the sink node to transmit more data than those far from it. Most data gathering mechanisms now do not do well in balancing the energy consumption among nodes with different distances to the sink, thus they can hardly avoid the problem that nodes near the sink consume energy more quickly, which may cause the network rupture from the sink node. This paper presents a data gathering mechanism called PODA, which grades the output power of nodes according to their distances from the sink node. PODA balances energy consumption by setting the nodes near the sink with lower output power and the nodes far from the sink with higher output power. Simulation results show that the PODA mechanism can achieve even energy consumption in the entire network, improve energy efficiency and prolong the network lifetime.     

基于无线传感网络的停车场管理系统

This paper introduces a parking management system based on a wireless sensor network developed by our group. The system consists of a large amount of parking space monitoring nodes, a few parking guiding nodes, a sink node and a management station. All the nodes exchange information with each other through wireless communication. The prototype of the parking management system has been implemented and the preliminary test results show that the performance of the system can satisfy the requirements of the application.