低功耗節(jié)點(diǎn)利用短距離無(wú)線接口獲得個(gè)人網(wǎng)絡(luò)

　　隨著越來(lái)越多的個(gè)人電子產(chǎn)品連接到手機(jī)和彼此之間，個(gè)人區(qū)域網(wǎng)絡(luò)（泛網(wǎng)絡(luò)）——跨越通常不到兩米的短程網(wǎng)絡(luò)——正在激增。用于監(jiān)測(cè)活動(dòng)和收集數(shù)據(jù)的個(gè)人健身和可穿戴醫(yī)療配件的最新趨勢(shì)增加了短距離、可靠和廉價(jià)的PAN解決方案的需求。有時(shí)被稱為“體域網(wǎng)”，這些短距離通信解決方案利用各種無(wú)線標(biāo)準(zhǔn)，如藍(lán)牙（IEEE 802.15），藍(lán)牙低能耗、ZigBee、Wi Fi（802.11），近場(chǎng)通信（NFC）、RFID、基于協(xié)議如OOK其他專有接口（通斷鍵控）、頻移鍵控（頻移鍵控）、問(wèn)（幅移鍵控）。

　　無(wú)論是無(wú)線PAN（WPAN）是專注于你的身體或如辦公室辦公的一個(gè)小房間的面積稍大，也許高達(dá)10米，在大多數(shù)情況下，距離可以由輻射功率從收發(fā)器的發(fā)射部分。因此，一個(gè)WPAN可以互連所有典型的計(jì)算和通信設(shè)備，我們已經(jīng)在我們的口袋里或在桌面–也可以更專注的目的，如允許外科醫(yī)生和他的團(tuán)隊(duì)溝通過(guò)程中的操作和監(jiān)控病人沒(méi)有大的雜亂的電線（圖1）。

　　Figure 1： This simplistic view of a wireless personal area network shows some of the basic ways various devices will link together “turning” the user into the network hub. Devices can either communicate directly to the user or intercommunicate with each other through the WPAN.

　　WPANs are not a new concept – they have been discussed and implemented for almost three decades. However， in the last few years， the high level of integration and low power consumption of the ICs used to implement the transceivers and protocols has made the WPAN much more economically practical. The IEEE has also been developing various standards to help define potential WPAN implementations. For instance， the IEEE Std. 802.15.1-2002 defines a WPAN based on Bluetooth v1.1， which includes a specification and descriptive language model for an integrated Bluetooth media-access control sublayer. Another IEEE group （P802.15.3） was chartered to draft a high-data-rate WPAN that transfers data at 20 Mbits/s and higher.