基于802.15.6协议的MAC层接入访问方法研究  

Access Method Research Based MAC Protocol for Wireless Body Area Networks

作　　者：李承晓[1] 黄华伟[1] 庞宇[1] 孙文珺[1] 王蔷薇[1] 

机构地区：[1]重庆邮电大学光电工程学院,重庆400065

出　　处：《生命科学仪器》2014年第5期46-49,45,共5页Life Science Instruments

摘　　要：近年来,人体局域网(BAN,Body Area Network)迅速崛起,它是通过附着在人体表面或植入人体内的传感器系列节点在人体范围内进行通信的新型无线传感器网络。BAN节点具有能耗小,可扩展性高等特点,在人们的日常生活、医疗等领域广泛应用。它将采集到的生命体征信息ECG(Electrocardiogram),EEG(Electroencephalography)等汇聚到智能终端,通过现有的宽带无线传输网进行数据的传输,即可以实现随时随地的"自我感知""自我跟踪",极大的满足了医疗领域智慧医疗的需求。本文研究了通用网络MAC层中典型的三种接入方式Aloha、S-aloha、CSMA(Carrier Sense Multiple Access),比较其对整体网络性能的影响,并以15.6协议中规定的超帧结构为基础提出了一种具有业务优先级的新型超帧结构。在此帧结构中的竞争阶段运用S-aloha接入机制,在OPNET仿真平台上通过改变节点数个数、信道码率、数据包大小等参数分析对比出最适合BAN接入机制的模型。In recent years, a small, energy-saving network has rapidly rised and its related technology is developing quickly. This network-BAN is a new WSN of short-range, wireless communications in the vicinity of, or inside, a human body. These nodes have the characters of small energy consumption, high extensibility, etc, which is widely used in people＇s daily life, health care, medical and other fields. It collected vital signs information, such as ECG（Electrocardiogram）, EEG（Electroencephalography）, through the existing broadband wireless transmission network into terminal, which can realize ＂self-aware＂, ＂self-track＂ at anytime anywhere, and greatly satisfi ed the needs of medical health wisdom. In this paper, we researched the three typical access methods in the MAC layer of the normal network—Aloha, S-Aloha, CSMA, compared their infl uence on the overall network performance through the simulation, and proposed the newly superframe with business priorities based on 802.15.6 protocol. HAP（High Access Phase）, FAP（Follow Access Phase） and SAP（Second Access Phase） access phases were defined in the active phase of the node＇s contention period, and using s-aloha acess mechanism, the analysis and comparison of OPNET simulation platform BAN accessed the most suitable model for the mechanism by changing the number of nodes, the channel bit rate, packet size and other parameters.

关 键 词：BAN OPNET Slot-aloha 超帧结构 接入机制 

分 类 号：TP311.13[自动化与计算机技术—计算机软件与理论]