无线多跳网络的复杂性、动态性和移动性等特点，使传统网络可靠性评估方法不能直接迁移使用。针对无线多跳网络可靠性分析和量化等问题，对近年有关无线自组织网络、无线传感器网络和无线Mesh网络3种典型无线多跳网络可靠性研究按可靠性评估算法、网络可靠性协议、网络可靠性设计3个递进的层面分别进行了全方位剖析，并结合物联网应用环境，对无线多跳网络可靠性研究的发展趋势进行了展望。研究工作有助于指导网络设计，提升网络的可靠性及部署能力。

It is unsuitable for evaluating the reliability of wireless multi-hop network with traditional methods, due to its complexity, dynamic and mobility. Aiming at studying on the analysis and quantity of wireless multi-hop network reliability, it has been analysed related literatures during the past years. They are divided into three progressive groups, so called the reliability estimation algorithm, the reliable protocol and the designing of reliable network. Each group is analysed accord-ingly for three typical wireless multi-hop network types. Furthermore, the development trend of reliability research of wireless multi-hop network is discussed combined with application of IoT.

为了适应移动无线mesh网络在军事作战、灾后救援等特殊领域,为路由协议及拓扑控制设计提供理论模型,研究了基于社会网络的节点移动模型,并比较了各节点移动模型在实际应用中的优势和劣势。研究结果表明,针对不同的应用场景,选用合理的移动模型进行拓扑建模,可有效改善网络的性能。

In order to adapt the special area of military operations and disaster relief in the mobile wireless mesh network and offer theoretical model for the design of routing protocol and topology control,the node mobility model based on social net-work is studied.The advantages and disadvantages of node mobility model in practical application are summarized and com-pared.The results show that the rational choice of the node mobility model for topology modeling can improve network per-formance in the different practical application scenarios.

基于多方向天线阵列的同步无线Mesh网络采用时分和空分技术，实现了通信带宽和性能的提升，但当网络中的节点因移动导致通信天线扇区相对位置发生改变时，通信链路的质量会下降甚至中断，为了解决这一问题，设计了一种基于多方向天线阵列的波束切换算法。研究了波束切换的时机，设计了一种自动探测波束切换时机的策略，在波束需要切换时，通过波束切换算法完成波束切换过程。验证结果表明，该算法满足非高速移动情况下的波束切换需求。

The communication bandwidth and performance was improved in the synchronized wireless Mesh network based on 8-sector antenna array through sharing time and space,and the covered range was extremely improved,but when the relative po-sition of the communication pair of antennas changed because of the mobility of the wireless node,the quality of the link dega-ded,and sometimes the link broke.To solve the problem,an antenna switch arithmetic was designed.The timing of switch was studied,an automatic detection switching timing strategy was designed,when switching timing came,switch happened.Vali-dation results showed that the antenna switch arithmetic could solve the antenna switch problem in low mobility.

不同于无线传感器网络和移动Ad Hoc网络,无线Mesh网络中的组播主要侧重于提高吞吐量,而干扰是影响吞吐量的重要因素.在构建组播拓扑时,传统的方法主要考虑最小价值或最短路径,而通过减少干扰来提高组播性能的研究较少,且它们的干扰计算方法都采用单播的思想,并不适合于组播.例如,当n个接收节点同时从一个节点接收数据时,在组播中这n个接收节点之间不存在干扰,而在单播中认为存在干扰.因此,提出了组播冲突图来计算组播干扰,给出组播树干扰的定义.可以发现,求最小干扰组播扰树是NP完全问题,然后提出基于万有引力的启发式算法构建具有较小干扰的组播树.为了适用于多信道的情况,提出了满足不同干扰范围的多跳信道分配算法.最后,仿真结果显示,与MCM相比,所提出的算法无论是在单天线单信道还是多天线多信道下,都能取得较高的吞吐量和较低的延迟.

Compared with wireless sensor networks and mobile ad hoc networks, wireless mesh networks mainly focus on improving the throughput of multicast, while interference severely limits the network throughput. When building a multicast topology, the minimum cost or shortest path is generally taken into account in the traditional methods, and only a few works have tried to improve the performance by reducing interference. However, they calculate the interference by the method for unicast topology, which is not suitable for multicast. For example if n nodes will receive simultaneously packets from one node, among these n nodes there is interference in unicast, but not in multicast. Therefore this tudy proposes the multicast conflict graph to calculate interference of the multicast topology, and then the concise definition of interference of multicast trees is provided. The study shows that building minimum interference multicast trees (MITs) is a NP-complete problem and proposes a gravitation-