如何使用Sigfox技術(shù)連接到物聯(lián)網(wǎng)

　　物聯(lián)網(wǎng)的最重要的挑戰(zhàn)之一是能夠輕松地添加無線傳感器節(jié)點(diǎn)和成本效益。無線鏈路需要低功耗，使節(jié)點(diǎn)可以運(yùn)行在一個(gè)單一的硬幣細(xì)胞多年，但有一個(gè)長(zhǎng)期的范圍，使成千上萬的節(jié)點(diǎn)可以連接到網(wǎng)關(guān)收集數(shù)據(jù)。

　　這是一個(gè)重大的挑戰(zhàn)。Sigfox在法國(guó)開發(fā)了一種低功耗無線協(xié)議，網(wǎng)絡(luò)實(shí)施，和云計(jì)算基礎(chǔ)設(shè)施，可以用來連接數(shù)以百萬計(jì)的低功耗無線設(shè)備。低功耗協(xié)議結(jié)合網(wǎng)關(guān)類似于蜂窩電話系統(tǒng)網(wǎng)絡(luò)，但不同的機(jī)器對(duì)機(jī)器的應(yīng)用在蜂窩網(wǎng)絡(luò)，SIGFOX網(wǎng)絡(luò)致力于物聯(lián)網(wǎng)應(yīng)用，如健康、能源監(jiān)控、溫濕度檢測(cè)和安全監(jiān)測(cè)。

　　SIGFOX has optimized its network implementation for the low data rates unidirectional aspects of these applications. The network supports rates of 100 bit/s from the node to the gateway， with data transfers limited to 140 times a day. This is still sufficient for monitoring applications， but allows an energy meter， for example， to operate with a link power budget of just 50 microwatts rather than one watt for a cellular network. Focusing on uploads also allows the design of the gateway to be shifted to have a more sensitive receiver that can handle data from thousands of nodes.