<span style="font-family: 'Times New Roman',serif; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-fareast-language: DE; mso-ansi-language: EN-US; mso-bidi-language: AR-SA;">This paper aims to build a mobile communication system suitable for different application scenarios of the Internet of Things (IoT). For this purpose, an IoT system was developed based on device-to-device (D2D) communication technology and radio-frequency identification (RFID). The D2D-RFID-based IoT system combines the merits of mobile communication (e.g. 4G) and the RFID. The analysis shows that the proposed system boasts good mobility, stable transmission, short time delay, fixed IP, and no need of a central server. The research findings have a great application potential in different IoT scenarios.</span>

With the development of wireless technology, many TCP-based HTTP applications are running slow, especially under the wireless environment. This paper first analyzes the causes of this situation, and then discusses the advantages of Google's experimental QUIC protocol in wireless transmission and finds that QUIC is easy to extend and deploy, providing a good framework for personalized optimization. This paper applies the QUIC framework and presents a QUIC optimization algorithm for the VPN or LAN scenarios, which mainly improves the congestion algorithm on the basis of QUIC. Through simulation tests, it is found in the wireless environment with high latency and high packet loss rate, the QUICMING-based HTTP applications perform significantly better than those based on TCP, SPDY and default QUIC.