工廠無線感測網路之傳輸排程演算法在考慮相鄰頻道干擾下的效能分析

Performance Analysis of Chain-based Transmission Scheduling Considering Adjacent Channel Interference in Industrial Wireless Sensor Networks

胡仁豪(Ren-Hao Hu)

指導教授 ： 侯廷昭

國立中正大學/工學院/通訊工程學系/碩士(2014年)

摘要

近幾年來，無線感測網路 (Wireless Sensor Network, WSN) 應用越來越廣泛，其涵括的領域從軍事用途到工廠自動化以及智慧家庭皆有其應用。在無線感測網路中，所有節點的體積並不大，同時所具有的處理能力以及記憶體容量也都有限，因此造價並不昂貴。這些感測節點可以感測、測量以及收集周遭的環境資訊，而且根據不同的網路設計方式，有些節點甚至可以回傳資料給使用者。
而在工廠環境下架設無線感測網路的需求不同於一般的感測網路，在工廠無線感測網路中，要求監控設備的感測節點能夠將所感測到的資料盡快傳送到資料收集中心，以便能夠及時處理有問題的設備。在使用令牌 (Token) 為主的鏈狀結構的傳輸排程演算法中，藉由令牌在鏈上的傳遞，安排每一節點傳輸的順序，避免同一鏈上封包碰撞的發生，也提供時間延遲的保證。本論文探討使用多條子鏈且操作在不同的頻道時，來自相鄰頻道的干擾ACI (Adjacent Channel Interference)所造成的影響，同時根據不同的子鏈數對其傳輸成功率、延遲時間以及吞吐量作效能分析，並加入MCS (Modulation and Coding Scheme)的考量，更精確的了解ACI對整體網路所造成的影響。

關鍵字

相鄰頻道干擾 ； 傳輸排程 ； 無線感測網路

並列摘要

The wireless sensor network (WSN) has been widely used recently in many areas like factory environment monitoring, industrial automation and smart home. These sensors are small, with limited processing and computing resources, and they are inexpensive compared to traditional sensors. These sensor nodes can sense, measure, and gather information from the environment and, based on some local decision process, they can transmit the sensed data to the user.
The requirements of industrial WSN differ from those of the traditional WSN. In the industrial WSN, the sensed information should be sent to the monitoring center as soon as possible. In this thesis we study the chain-based transmission scheduling algorithm. The token passing on the chain determines the order of data packet transmission of each nodes and therefore avoids packet collisions within a chain and provides a delay bound guarantee to each data packet. However using multiple chains operating in different channels, there may have the adjacent-channel interference (ACI). We analyze the performance, delivery ratio, delay time and throughput of the network having different chains. We also consider the modulation and coding scheme (MCS) to more accurately quantify the influence caused by ACI.

並列關鍵字

adjacent channel interference ； transmission scheduling ； wireless sensor network

參考文獻

[1]G. Bianchi, “IEEE 802.11-Saturation Throughput Analysis,” IEEE Commun. Letter, vol2, pp. 318-320, Dec. 1998.

[2]G. Bianchi, “Performance analysis of the IEEE 802.11 Distributed Coordination Function,” IEEE J. Sel. Areas Commun., pp. 535-547, Mar.2000.

[3]P. Ferre, A. Doufexi, A. Nix, D. Bull, “Throughput Analysis of IEEE 802.11 and IEEE 802.11e MAC,” Wireless Communications and Networking Conference (WCNC), 2004.

[4]V. C. Gungor and G. P. Hancke, “Industrial Wireless Sensor Networks Challenges Design Principles and Technical Approaches,” IEEE Transactions on Industrial Electronics, vol. 56, pp. 4258 – 4265, October 2009.

[5]N. Tabassum, Q. Ehsanul, K. Mamun, Y. Urano, “COSEN: A Chain Oriented Sensor Network for Efficient Data Collection,” Information Technology: New Generations, ITNG, 2006.