基于IEEE 802.15.6標準無線體域網的跨層重傳策略研究

王國棟　郭坤祺

摘要 由于受人體姿勢與動作影響，無線體域網傳感器節點與Hub節點通信會出現陰影效應，導致收發端數據傳輸失敗率高，數據幀重傳成功率低，同時多次數據重傳造成額外能量消耗。為了提高數據重傳成功率，減少網絡節點能量消耗，提出基于IEEE802.15.6標準的跨層重傳策略，通過分析失敗數據幀在物理層的信號特征，探究傳送失敗的原因，并設計MAC層重傳方案。實驗結果表明，與IEEE802.15.6標準相比，基于IEEE802.15.6的無線體域網跨層重傳策略幀重傳成功率更高，功率消耗更低，不僅可以提高數據幀重傳成功率，改善網絡失幀率，而且能夠延長無線體域網節點使用壽命。

關鍵詞 無線體域網；陰影效應；IEEE802.15.6；跨層重傳策略；MAC

DOIDOI：10.11907/rjdk.181081

中圖分類號：TP393

文獻標識碼：A文章編號文章編號：16727800（2018）009020003

英文標題An CrossLayer Retransmission Strategy for the Body Shadowing Affect in IEEE 802.15.6Based WBAN

--副標題

英文作者WANG Guodong， GUO Kunqi

英文作者單位（School of Computer Science and Telecommunication Engineering，Jiangsu University，Zhenjiang 212013，China）

英文摘要Abstract：Due to the influence of human body posture and movement，the shadowing effect occurs between the sensor nodes and the Hub node in the wireless body area network，resulting in high failure rate of data transmission between the sender and the receiver and low successful probability of frame retransmission；meanwhile，multiple data retransmissions cause extra energy consumption.In order to solve the problems， a crosslayer retransmission strategy based on the IEEE802.15.6 standard is proposed.According to the signal characteristics of failed data frames at the physical layer，the reasons for the transmission failure are analyzed and the allocation of retransmission is designed at MAC.The experimental results show that the crosslayer retransmission strategy has higher success rate of frame retransmission and lower power consumption than the IEEE802.15.6 standard.Therefore，the crosslayer retransmission strategy based on IEEE802.15.6 can not only improve the success rate of data frame retransmission，and loss rate of the network，but also prolong the working time of nodes in the wireless body area network.

英文關鍵詞Key Words：wireless body area network；shadowing affect；IEEE 802.15.6；crosslayer retransmission strategy；MAC

0引言

無線體域網（wireless body area network，WBAN）是一種以人體為中心的小型網絡[1]，利用分布在人體體表或植入體內的無線傳感器監測并提取人體生理信息（如體溫、血壓、心率、血氧濃度等），通過無線信道將收集的生理參數發送至網絡Hub節點[2]。Hub節點通過互聯網與終端服務器通信[3]，幫助醫院與家屬對被監護者進行實時監測[4]。

對于無線體域網節能策略的研究主要集中在物理層、MAC層與網絡層。Verbiest等[5]設計的微型化、低成本印制單極天線在體表通信中有較好的節能表現，但天線的工作頻率、發射效率及帶寬易受人體干擾。CA-MAC協議[6]是一種情景感知協議，使用超幀混合結構，通過信道感知進行訪問策略分配，通過流量感知進行時隙分配。……