如何設計無線個人區域網絡用于醫療和消費應用

　　超低功耗的2.4 GHz的個人區域網絡應用如醫療、運動監測擴大協議范圍，從低功耗藍牙和ZigBee 802.15.4j標準專有協議如該。本文闡述了如何在藍牙設備如劍橋硅無線和德克薩斯儀器CC2540的csr1000可用于醫療和消費設計，以及Atmel的at86rf231實施和飛思卡爾半導體MC13224為ZigBee和該網絡。

　　現有的、經過驗證的技術的變化正在出現，以應對醫療和消費者使用的超低功率、短程無線網絡的挑戰。成熟的ZigBee 802.15.4標準已被修改以支持在2.35醫療應用的2.40 GHz頻帶，毗鄰現有的2.4 GHz的免執照頻段。新的藍牙低能量協議的單芯片設備正在開辟新的機會，將醫療設備和其他消費設備與移動電話相連接，以提供類似的個人區域網絡功能。

　　醫療體域網（MBAN）是一個個人區域網絡的關鍵技術，并對ZigBee的物理層和MAC層的802.15.4j修改在2013年2月被批準。這提供了相同的健壯、低功耗的網狀網絡協議，在美國略有不同的頻率擴展，以避免擁擠的無執照頻譜，并提供更多的可靠性和系統的魯棒性，從2013年6月起。

　　Here the design requirements are less about the data rate and more about the power consumption and cost. Being able to implement a PAN （personal area network） or MBAN with devices that can run for weeks， months， or even years from a single-cell battery is a key aim. 802.15.4j allows devices to operate with lower power as re-transmission of packets is reduced and the shorter range means less power is needed for a link. The mesh networks mean that adjacent devices can be used to carry data across the network， further shortening the link distance and reducing the overall power consumption if there are several sensors across the body. These do， however， need a hub device to control access to the network and to collect data to link to the Internet via networks such as Wi-Fi or a cellular phone. However， the existing ZigBee protocol is also highly applicable to these wearable， personal networks with a low-cost， robust approach.