低功耗節(jié)點利用短距離無線接口獲得個人網(wǎng)絡(luò)

　　隨著越來越多的個人電子產(chǎn)品連接到手機和彼此之間，個人區(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)測活動和收集數(shù)據(jù)的個人健身和可穿戴醫(yī)療配件的最新趨勢增加了短距離、可靠和廉價的PAN解決方案的需求。有時被稱為“體域網(wǎng)”，這些短距離通信解決方案利用各種無線標準，如藍牙（IEEE 802.15），藍牙低能耗、ZigBee、Wi Fi（802.11），近場通信（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（幅移鍵控）。

　　無論是無線PAN（WPAN）是專注于你的身體或如辦公室辦公的一個小房間的面積稍大，也許高達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WPAN可以互連所有典型的計算和通信設(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)生和他的團隊溝通過程中的操作和監(jiān)控病人沒有大的雜亂的電線（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.