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满足物联网标准不断变化的认证挑战
本文着眼于物联网设备的欧洲无线标准的协调（EN 300 328 v1.9.1）在2.4 GHz频段的2.4 GHz，对其他细胞带如LTE-M和窄带LTE的背景下。新标准在2016十一月生效，文章着眼于如何影响物联网设备的开发者
标准化是世界创新的挑战。等待频段分配在不同的地区，为被批准使用的技术和被分配的许可证，可以减缓推出新的应用程序。这当然是与使用物联网技术（物联网）的移动电话技术的情况下。而中央有一个标准，3GPP，最新的窄带LTE的发展（lte-nb）技术的物联网已经慢。5G的前景更具挑战性，因为4G与Wi-Fi结合在高速通道。
In contrast， the unregulated ISM （Industrial， ScienTIfic and Medical） bands provide an easy way for wireless technologies to be used for the IoT. The 2.4 GHz band is parTIcularly popular for wireless links with a wide range of technologies available without the need for global approvals. Wi-Fi， Bluetooth and ZigBee all operate in this band， and that has been causing some challenges. While each has its own standards body –IEEE802.11 for Wi-Fi， IEEE802.15.4 for ZigBee and L4PAN and the Bluetooth Special Interest Group for Bluetooth， there is limited collaboraTIon between the groups.
Market researchers Machina Research predict the total number of IoT connecTIons will grow from 6 billion in 2015 to 27 billion in 2025， a growth of 16% a year. The vast majority of these connections （71%） are the short range， 2.4 GHz links such as Wi-Fi and ZigBee， highlighting how the frequency band is set to become even more crowded.
