定向无线自组网链路可用带宽预测与跨层路由研究

发布时间：2018-08-28 13:52

【摘要】：基于定向天线的无线自组织网络具有空分复用度高、网络总吞吐量大、抗干扰能力强等优势,近年来受到了研究人员的广泛关注。链路可用带宽是指在不影响网络现有业务服务质量(QoS)水平的前提下,链路收/发节点所能获得的最大数据传输带宽。紧密结合定向数据传输的特点,提出适用于定向信道接入控制(MAC)协议的链路可用带宽预测方法,并以预测结果为依据,实现跨层路由选择,是为定向无线自组网多媒体业务提供QoS保证的关键。本文的研究工作紧紧围绕上述关键问题展开,主要创新内容包括:(1)在典型定向随机接入协议(D-MAC)的框架内,提出了一种定向链路可用带宽预测方法。节点首先通过侦听每个天线波束方向上的信道状态,获知每个天线波束方向上的信道可用时长信息;然后采用分布式的方法分析链路收/发节点可用时长不同步的概率,得到链路可用带宽的初步估计值;最后,在针对定向随机接入协议可用带宽预测的难点问题展开深入分析的基础上,分别考虑了对定向链路实际可用带宽产生影响的七种不同因素,对链路可用带宽的初步估计值进行修正,得到了链路可用带宽的最终估计值。多种仿真场景下的仿真实验结果证明了本文提出的定向链路可用带宽预测方法的有效性。(2)在对定向链路可用带宽进行预测的基础上,设计了一种面向多媒体业务QoS保证的跨层路由协议。该协议将MAC层估计的定向链路可用带宽作为链路传输吞吐量的上限,并将MAC层定向链路可用带宽和路由跳数作为网络层路由选择的依据,从而实现对新入网业务的信道接入和路由控制,保障网络中现有数据业务的QoS。同时,在预测定向多跳链路业务的实际带宽消耗时,该协议还充分考虑了定向传输“流内竞争”问题,并指出在定向多跳链路中某一节点处的实际带宽消耗应为业务需求带宽的竞争节点数倍。仿真结果证明该协议的性能优于典型的无线自组织网络定向动态源路由协议。
[Abstract]:Wireless ad hoc networks based on directional antennas have many advantages, such as high spatial division multiplexing, large network throughput, strong anti-jamming ability, and so on, which have attracted extensive attention of researchers in recent years. Link available bandwidth refers to the maximum data transmission bandwidth that can be obtained by the link receiving / transmitting node without affecting the (QoS) level of the existing network services. Based on the characteristics of directional data transmission, a link available bandwidth prediction method for (MAC) protocol is proposed. Based on the prediction results, cross-layer routing is realized. It is the key to provide QoS guarantee for directed wireless ad hoc network multimedia services. The main innovations of this paper are as follows: (1) within the framework of a typical directional random access protocol (D-MAC), a method for predicting the available bandwidth of directional link is proposed. First of all, the node obtains the information of the available time of the channel in each antenna beam by listening to the channel state in the direction of each antenna beam, and then analyzes the probability of the non-synchronization of the available time of the link receiving / transmitting node by using a distributed method. A preliminary estimate of the available bandwidth of the link is obtained. Finally, based on the in-depth analysis of the difficulties in the prediction of the available bandwidth of the directional random access protocol, Seven different factors which affect the actual available bandwidth of the directional link are considered respectively. The initial estimate of the available bandwidth of the link is corrected and the final estimate of the available bandwidth of the link is obtained. The simulation results in various simulation scenarios demonstrate the effectiveness of the proposed method. (2) based on the prediction of the available bandwidth of the directional link, A cross-layer routing protocol for QoS guarantee of multimedia services is designed. The available bandwidth of the directional link estimated by the MAC layer is taken as the upper limit of the link transmission throughput, and the available bandwidth and the number of routing hops of the MAC layer are taken as the basis for the routing selection of the network layer. Thus, the channel access and routing control of new access services can be realized, and the QoS. of existing data services in the network can be guaranteed. At the same time, when predicting the actual bandwidth consumption of directional multi-hop link service, the protocol also fully considers the "in-stream competition" problem of directional transmission. It is also pointed out that the actual bandwidth consumption at a node in the directed multi-hop link should be several times that of the competing node of the service demand bandwidth. Simulation results show that the performance of the proposed protocol is superior to that of the typical Ad hoc network oriented dynamic source routing protocol.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN929.5

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