The Design of an Adapted Media Access Control Protocol for Long Range Wireless Internet of Things

• Main Authors: LIN,HONG-WEI, 林鴻偉
• Other Authors: HSU, CHIH-SHUN
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/rw8y2j

碩士 === 世新大學 === 資訊管理學研究所(含碩專班) === 106 === As Internet of Things (IoT) becomes more and more popular, how to connect things to the network has become an important issue. In order to meet the needs of wireless IoT in long-range communication, the low power wide area network has emerged. Technology of low power long range wireless IoT (LoRa) focuses on reducing the cost and power consumption and extending the communication range of devices. However, the media access control (MAC) protocol of these low power long range wireless IoT technologies cannot meet the requirements of different communication environments and thus they may incur unnecessary interferences and retransmissions. To meet the requirements of different communication environments, an adaptive MAC protocol for low power long range wireless IoT is proposed. For routine communications, a prescheduled MAC protocol is proposed so as to avoid contentions and collisions and a simple transmission mechanism (Aloha) is adopted so as to save energy. For burst communications, the MAC protocol is tuned according to the sensed communication environment, an environment-aware and random access mechanism is proposed so as to Avoid collisions. The IoT device predict the number of competitors and the number of packets generated per unit of time so as to calculate the probability of success, the number of failures, and the power consumption. The MAC protocol is switched according to power consumption, to meet the requirements of different communication environments. Experimental results show that the proposed adaptive media access control protocols is better than a single media access control protocol which uses pure Aloha and CSMA/CA only.