Gateway-Assisted Retransmission for Lightweight and Reliable IoT Communications

Sensors

Mong-Ting Wu¹  Cheng-Gang Wang¹  Hui-Ling Chang¹  Chia-Ying Lin¹  Meng-Hsun Tsai¹ 

[1] Department of Computer Science and Information Engineering, National Cheng Kung University, Tainan 701, Taiwan;

关键词: Constrained Application Protocol (CoAP);    Internet of Things (IoT);    Message Queuing Telemetry Transport for Sensor Networks (MQTT-SN);    retransmission mechanism;    retransmission timeout (RTO);    round-trip time (RTT);   

DOI  :  10.3390/s16101560

来源: DOAJ

【 摘 要 】

Message Queuing Telemetry Transport for Sensor Networks (MQTT-SN) and Constrained Application Protocol (CoAP) are two protocols supporting publish/subscribe models for IoT devices to publish messages to interested subscribers. Retransmission mechanisms are introduced to compensate for the lack of data reliability. If the device does not receive the acknowledgement (ACK) before retransmission timeout (RTO) expires, the device will retransmit data. Setting an appropriate RTO is important because the delay may be large or retransmission may be too frequent when the RTO is inappropriate. We propose a Gateway-assisted CoAP (GaCoAP) to dynamically compute RTO for devices. Simulation models are proposed to investigate the performance of GaCoAP compared with four other methods. The experiment results show that GaCoAP is more suitable for IoT devices.

【 授权许可】

Unknown