基于轮换簇头的多跳对等蓝牙Ad Hoc网络形成协议

蓝牙是一种新型无线通信技术,它在物理层上采用跳频方式,能够使便携设备组成短距离无线自组织网络.但是节点地位不对等性制约着蓝牙技术在Ad Hoc网络中的应用.在研究现有网络形成协议基础上,提出基于轮换簇头思想,利用蓝牙规范中角色转换协议,分时轮换簇头,使每个节点地位完全对等,以克服蓝牙Ad Hoc网络的不对等性。同时,控制节点度数,引入一跳网桥,有效减少了数据转发跳数.详细描述了拓扑构建,微微网形成,微微网互连以及对等网络形成的规则.使用该规则可以不需所有蓝牙节点处于相互传输距离内而形成连通的多跳对等网络.通过对200个节点的仿真,结果表明该协议能够快速形成连通网络,且数据转发次数较少.

A Multi-hop Peer-to-peer Bluetooth Ad Hoc Networks Formation Protocol Based on Cycle-switching Cluster-head

As a promising new wireless technology,Bluetooth enables portable devices to form short-range wireless ad hoc networks based on a frequency hopping physical layer,but asymmetry of nodes is a serious problem in applying Bluetooth technology into ad hoc networks.Based on the study on the present networks formation protocols,we describe an idea of cycle-switching cluster-head to overcome the asymmetry of Bluetooth ad hoc networks.In this paper,we utilize switch-role protocol in the specification of the Bluetooth system to switch cluster-head in time-sharing and form a multi-hop peer-to-peer Bluetooth ad hoc network.We propose to control node-degree and introduce one-hop bridge to reduce the number of data transmission.We define rules for device discovery,piconet formation,piconet interconnection and peer-to-peer networks formation in detail.By using these rules,we connect the protocol forms with multi-hop peer-to-peer networks without requiring the Bluetooth devices to be all in each other transmission range.The simulation results in networks with 200 nodes show that this protocol can not only quickly generate connected networks but also efficiently reduce the number of data transmission.