A Grouping Mechanism Based on Network Status for IEEE 802.11ah Networks

• Main Authors: Tsai, Ding-Bang, 蔡定邦
• Other Authors: Hwang, Wen-Shyang
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/cm2btz

碩士 === 國立高雄應用科技大學 === 電機工程系博碩士班 === 106 === The development of the Internet of Things has matured so far, such as smart home, smart healthcare, smart grid, smart factory and other applications. With the increase in the number of wireless transmission devices and the distance between the machine and machine. The traditional wireless communication technology used by the Internet of Things are like Bluetooth and Zigbee, which can only be limited to a small range of IoT environments. In this context, IEEE 802.11ah is aliased to Wi-Fi HaLow was proposed, IEEE802.11 ah extended Wi-Fi to less than 1 GHz spectrum, and optimized through multiple physical layer and Media Access Control, which makes IEEE802.11 ah becomes the best agreement for the connection of today's Internet of Things devices. The restricted access window restricts competition that large number of devices upload packets at the same time by limiting access to only one group. However, the standard does not stipulate how to set the optimal RAW grouping parameters, and it has been confirmed in previous studies that inappropriate RAW grouping parameters have an impact on the network throughput, packet delay and performance. In this paper, we propose a grouping mechanism according to the network state by collecting the past packet transmission records and analysing the current network state. After changing the current grouping state until the suitable RAW grouping parameters.