滿足物聯(lián)網(wǎng)標(biāo)準(zhǔn)不斷變化的認證挑戰(zhàn)

　　本文著眼于物聯(lián)網(wǎng)設(shè)備的歐洲無線標(biāo)準(zhǔn)的協(xié)調(diào)（EN 300 328 v1.9.1）在2.4 GHz頻段的2.4 GHz，對其他細胞帶如LTE-M和窄帶LTE的背景下。新標(biāo)準(zhǔn)在2016十一月生效，文章著眼于如何影響物聯(lián)網(wǎng)設(shè)備的開發(fā)者

　　標(biāo)準(zhǔn)化是世界創(chuàng)新的挑戰(zhàn)。等待頻段分配在不同的地區(qū)，為被批準(zhǔn)使用的技術(shù)和被分配的許可證，可以減緩?fù)瞥鲂碌膽?yīng)用程序。這當(dāng)然是與使用物聯(lián)網(wǎng)技術(shù)（物聯(lián)網(wǎng)）的移動電話技術(shù)的情況下。而中央有一個標(biāo)準(zhǔn)，3GPP，最新的窄帶LTE的發(fā)展（lte-nb）技術(shù)的物聯(lián)網(wǎng)已經(jīng)慢。5G的前景更具挑戰(zhàn)性，因為4G與Wi-Fi結(jié)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.