Abstract
In the limited frequency spectrum shared by various wireless communication technologies, cross-technology interference is an important factor which determines communication performance. A variety of coexistence methods to reduce the impact of this interference have been studied, but most of them cannot explicitly coordinate the shared spectrum and are not practical. This paper presents an explicit coexistence mechanism using cross-technology communication among heterogeneous wireless technologies. This mimics “carrier sense multiple access with collision avoidance” (CSMA/CA) via bidirectional cross-technology communication, which is called CTC-CSMA/CA. It allows communication between heterogeneous wireless technologies in order to achieve CSMA/CA. This accurately assigns required channel resources by directly sending and receiving feedback. CTC-CSMA/CA is a highly compatible technology because it does not require any modification to the IEEE 802.11 standard or any extra hardware. In addition, Zigbee can operate with a low duty cycle by synchronizing it to a periodic Wi-Fi beacon. We implemented CTC-CSMA/CA using a commodity Wi-Fi access point and a commercial Zigbee platform. Our experiments showed that the channels are coordinated more accurately by our method, which significantly improves Zigbee throughput, than by conventional schemes. We expect the proposed scheme to be an important application case in designing future cross-technology communication.
Highlights
Academic Editors: The Internet of Things (IoT) is a system that provides services by connecting various electronic devices to the Internet
CTCCSMA/CA is a highly compatible technology because it does not require any modification to the IEEE 802.11 standard or any extra hardware
This paper presents an explicit coexistence mechanism between wireless local area networks (WLANs) and wireless personal area networks (WPANs) via cross-technology communication (CTC), such as explicit channel coordination method (ECC)
Summary
Academic Editors: The Internet of Things (IoT) is a system that provides services by connecting various electronic devices to the Internet. Z. Yin et al [4] proposed an explicit channel coordination method (ECC) using cross-technology communication (CTC) without extra hardware. Wi-Fi AP allocates an accurate white space by receiving direct feedback (e.g., an RTS) from Zigbee in traffic dynamics, rather than using a statistical model, as in ECC. This makes Zigbee transparent to Wi-Fi. All. ECC shows lower throughput compared to channel coordination methods in homogeneous wireless technology This result shows an error of statistical model-based white space inference. CTC-CSMA/CA shows a throughput gain of 70.62% compared to ECC, and shows an average throughput gain of 20% or more compared to the traditional channel coordination mechanisms This shows that accurate white space inference is important.
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