【作者】 陈伟；

【导师】 李志强；

【作者基本信息】 电子科技大学 ， 工程硕士（专业学位）， 2019， 硕士

【摘要】 移动Ad Hoc网络(Mobile Ad hoc Networks,简称MANET)是一种无中心、自组织的全分布式网络,主要用于军事、抢险、救援等移动场景。网络中存在对时延要求很高的业务(如高级指令,紧急突发事件等),要求网络提供QoS保障,以满足实时业务传输的要求。针对以上问题,论文对MANET强业务优先级约束下的功率控制进行了研究,通过功率自适应调节,保障重要数据能够及时、准确地传递到目的地,为紧急突发事件的处理提供有效服务质量支持。主要有以下内容:一、提出了一种分布式的基于优先级的单信道MAC功率控制协议,确定网络中节点发射功率,实现功率自适应调节。(1)数据在源节点划分不同优先级,中间节点根据数据的优先级调度处理数据,保障高优先级的数据优先传输。(2)在控制帧中添加功率信息,通过节点之间功率信息的交换来确定数据的发射功率,实现功率自适应调节。使高优先级的数据获得更高的发射功率许可,提高了信噪比,保障数据的高效、可靠传输,减小了跳数,降低了时延;分配干扰限制功率,减小干扰,提高了信道空间复用度。低优先级数据以最小有效功率发送数据,为高优先级数据预留资源,减小了干扰,降低了能耗。实验仿真表明,在网络负载高的情况下,高优先级业务性能明显优于其它协议,相对于基于吞吐量和能耗的两种功率控制协议(IAPCM、PCM),时延分别降低了18%和43%,包投递率提高了10%和18%。二、提出了MAC层功率控制机制下的QoS路由协议,优化传输路径,提高网络服务质量。基于功率信息,以节点干扰限制功率作为路由控制帧的发射功率,建立网络拓扑结构。以时延、带宽、跳数为约束,使用混合的路由度量准则,选择QoS符合度最高的路径传输数据。并采用路径预修复机制,及时预修复服务质量变坏的链路,减小了时延和路由发现频率。仿真结果表明,相对于单一的MAC层功率控制,在网络负载较高时,高优先级业务时延降低约14%,包投递率提高了17%,低优先级业务时延、时延抖动和丢包率等性能也得到明显提升。在移动场景下,相对于IAPCM和PCM功率控制协议,高优先级业务时延、时延抖动、丢包率等性能具有明显优势。论文上述研究成果能够为移动Ad Hoc网络中紧急重要业务的实时处理提供有效支持,在实际应用中具有重要意义。更多还原

【Abstract】 Mobile Ad Hoc Networks(MANET)is a completely distributed network with no center and self-organization,which is mainly used in military,emergency rescue and other Mobile scenarios.In the network,there are services with high delay requirements(such as advanced instructions,emergency emergencies,etc.),which require the network to provide QoS guarantee to meet the requirements of real-time service transmission.In view of the above problems,this paper studies the power control under the constraint of strong business priority of MANET.Through the power adaptive adjustment,important data can be timely and accurately transmitted to the destination,providing effective service quality support for emergency emergencies.The main contents are as follows:Firstly,a distributed priority-based single channel MAC power control protocol is proposed to determine the transmitted power of nodes in the network and realize adaptive power adjustment.(1)data are assigned different priority in the source node,and the intermediate node processes data according to the priority of data,so as to ensure the priority transmission of high-priority data.(2)add power information in the control frame,determine the transmitting power of data through the exchange of power information between nodes,and realize the power adaptive adjustment.It enables high-priority data to obtain higher emission power permission,improves the signal to noise ratio,guarantees the efficient and reliable transmission of data,reduces the number of hops,and reduces the time delay.The distribution of interference limit power reduces interference and improves the multiplexing of channel space.Low priority series send data with the minimum effective power,reserving resources for high priority data,reducing interference and energy consumption.Experimental simulation shows that,under high network load,high priority service performance is significantly better than other protocols.Compared with the two power control protocols based on throughput and energy consumption(IAPCM and PCM),time delay is reduced by 18% and 43% respectively,and packet delivery rate is increased by 10% and 18% respectively.Secondly,Proposed QoS routing protocol under MAC layer power control mechanism,optimized transmission path,and improved network service quality.Based on the power information,the power limited by node interference is used as the transmitting power of the routing control frame to establish the network topology.With the constraints of delay,bandwidth and hop number,the route with the highest QoS compliance is selected to transmit data by using mixed routing metrics.And the route prerepair mechanism is adopted to timely pre-repair the links with poor service quality,thus reducing the delay and routing discovery frequency.The simulation results show that,compared with the single MAC layer power control,when the network load is high,the delay of high-priority service is reduced by about 14%,the packet delivery rate is increased by 17%,and the performance of lowpriority service delay,delay jitter and packet loss rate are also significantly improved.In the mobile scenario,compared with IAPCM and PCM power control protocols,high priority service delay,delay jitter,packet loss rate and other performance has obvious advantages.The above research results in this paper can provide effective support for real-time processing of urgent and important services in mobile Ad Hoc network,which is of great significance in practical application.更多还原