SCDD: Source Coalition Directed Diffusion Protocol for Wireless Sensor Networks

• Main Authors: Wei Lin, 林瑋
• Other Authors: Jyh-Ming Huang
• Format: Others
• Language: zh-TW
• Published: 2012
• Online Access: http://ndltd.ncl.edu.tw/handle/76870817079931134918

碩士 === 逢甲大學 === 資訊工程所 === 100 === For prolonging network lifetime, several energy-efficient routing schemes were proposed in wireless sensor networks (WSNs). Directed Diffusion (DD), a data-centric routing paradigm, is one of among them. In this protocol, every node has ability with sensing, collecting, and storing event data. Also, the best transmission path, called reinforcement path, will be determined by using exploratory packet information in DD. Transmitting data via reinforcement path can avoid blind transmission, and ensure that event data can quickly reach the base station. However, the paradigm usually consumes lots of energy and time to establish its transmission path, and even it is difficult to recover its faulty path when some fault occurs. Furthermore, most of DD-like protocols are concentrated on finding an optimal routing path for single-source data transmission environment. And thus they are not effectively suitable for multi-source scenarios. In this thesis, we propose an integrated routing protocol, termed as Source Coalition Directed Diffusion (SCDD), to study multi-source data transmissions in WSNs. SCDD can not only efficiently merge two nearby data flows to reduce network traffics and the number of packet collisions, but at the same time also effectively create a spare path for fault tolerant routing. In addition, SCDD can also combine with other path recovery mechanism to improve its network energy efficiency. To validate the proposed SCDD protocol, some C programs were coded to simulate its effectiveness on several environments. The simulation results are compared with some existing DD-related protocols, and eventually demonstrate that the proposed SCDD protocol is superior to some specific schemes, in terms of network energy efficiency, especially for fault tolerant routing.