Wireless technologies are very often used simultaneously for different applications in the same deployment area. This is more and more the case with the massive use of the Internet of Things. Very few of these technologies are designed to coexist efficiently. We concentrate in this paper on two technologies: IEEE 802.15.4 and IEEE 802.11. We consider the case where these two technologies are available on the same communicating node. We propose backoff algorithms for IEEE 802.15.4 (WPAN) that take into account information collected at a multi-interface node to improve coexistence with IEEE 802.11 (WLAN). The proposed mechanisms benefit from a virtual Clear Channel Assessment given by the WLAN interface to improve both network throughput and overall energy efficiency. Our simulation results show that the proposed mechanisms improve the basic CSMA/CA mechanism of WPAN by up to 26% of more packet delivery rate under a traffic load in WLAN that does not exceed 40%.

无线技术经常同时用于同一部署区域中的不同应用。随着物联网的大量使用，这种情况越来越多。这些技术中很少有被设计为有效共存。我们在本文中主要关注两种技术：IEEE 802.15.4 和 IEEE 802.11。我们考虑这两种技术在同一通信节点上可用的情况。我们为 IEEE 802.15.4 (WPAN) 提出了退避算法，该算法考虑了在多接口节点收集的信息，以改善与 IEEE 802.11 (WLAN) 的共存。提议的机制受益于由 WLAN 接口提供的虚拟空闲信道评估，以提高网络吞吐量和整体能源效率。