基于环境感知的空天网络动态路由技术研究
发布时间：2019-01-08 07:02
【摘要】：空天网络是由运行在不同轨道上的,各种类型的卫星、临近空间飞行器以及空中和地面用户有机组成的一体化信息系统。由于空天网络覆盖范围广阔,相距过远的用户之间不能直接通信,需要多跳中继传输数据,路由技术成为保障数据可靠、高效地传输的关键之一。空天网络具有拓扑结构动态变化、链路延时大、链路误码率高等特点,并且空间链路状态也受节点运动、业务传输和空间环境突发干扰等影响而动态变化。由于网络环境动态变化,故在选择路由时需动态地根据网络状态来计算传输路径,并且在数据的传输过程中,及时根据网络状态调整传输路径。目前还没有形成较为成熟完善的空天网络路由技术体系,现有的卫星网络及临近空间平台路由技术也不能完全适用于高动态的空天网络。为保障数据的可靠高效传输和多样化的业务需求,本文针对空天网络的特点和应用需求,着重研究拓扑结构、链路状态和传输业务高动态变化的空天网络环境下的动态路由技术,基于对网络环境的动态感知,进行传输路径的优化。首先,为保障不同业务需求并提高数据传输效率,本文针对不同类型业务构建空天网络数据传输的路由优化模型,确定不同类型业务的路由优化目标、准则以及影响传输路径优化的链路状态参数。考虑到空天网络链路延时长和误码率高的特点,本文对数据包的重传延时进行分析并引入到路由优化模型中,更加准确地反映数据传输的延时代价。基于路由优化模型,为优化不同业务的传输路径,本文针对空天网络中动态变化的链路延时(包括传播延时、重传延时、排队延时等)、丢包率、可用带宽这三个链路状态参数及其时变特性进行研究,建立网络环境的表征模型,重点针对排队延时进行研究,建立基于业务优先级的排队模型,对不同优先级的业务的排队时间分别进行计算,实现了对实时业务的保障,避免了选择优化路径时绕路的情况。在建立路由优化模型和网络环境表征模型的基础上,提出基于环境感知的空天网络动态路由协议。设计了网络环境感知机制,并针对业务的特点设计了带宽限制延时最短路由算法和最小跳数最大可用带宽路由算法,以及数据的转发方式。既保障了业务在延时、带宽方面的需求,提高了网络的整体的吞吐量,也在一定程度上从整体实现了网络的负载均衡。
[Abstract]:Space-space network is an integrated information system composed of various types of satellites, adjacent space vehicles and air and ground users. Due to the wide coverage of space-space network and the inability to communicate directly between users who are far away, multi-hop relay is needed to transmit data. Routing technology has become one of the keys to ensure reliable and efficient data transmission. Space-space network has the characteristics of dynamic topology, long link delay, high link error rate and so on. The spatial link state is also affected by node movement, traffic transmission and space environment burst interference. Because of the dynamic change of the network environment, it is necessary to calculate the transmission path dynamically according to the network state when choosing the route, and to adjust the transmission path according to the network state in time in the process of data transmission. At present, there is no mature space-sky network routing technology system, and the existing satellite network and adjacent space platform routing technology can not be fully applied to high-dynamic space-sky networks. In order to ensure the reliable and efficient transmission of data and the diversified business requirements, this paper focuses on the topological structure of the space-space network in view of its characteristics and application requirements. The dynamic routing technology based on the dynamic perception of the network environment is based on the dynamic perception of the network environment and optimizes the transmission path in the space-sky network environment with high dynamic change of link state and transmission services. First of all, in order to ensure different traffic requirements and improve the efficiency of data transmission, this paper constructs a routing optimization model for different types of services to determine the routing optimization objectives of different types of services. Criteria and link state parameters that affect transmission path optimization. Considering the characteristics of long link delay and high bit error rate in space-space network, this paper analyzes the retransmission delay of data packet and introduces it into the routing optimization model to reflect the delay cost of data transmission more accurately. Based on the routing optimization model, in order to optimize the transmission path of different traffic, this paper aims at the dynamic link delay (including propagation delay, retransmission delay, queue delay, etc.), packet loss rate, etc. The three link state parameters of available bandwidth and their time-varying characteristics are studied, and the representation model of network environment is established, especially the queuing delay, and the queuing model based on service priority is established. The queuing time of different priority services is calculated separately to guarantee the real-time traffic and avoid the situation of detour when choosing the optimized path. Based on the establishment of routing optimization model and network environment representation model, a dynamic routing protocol based on environment awareness for space-sky networks is proposed. The network environment awareness mechanism is designed, and bandwidth constrained delay shortest routing algorithm, minimum hops maximum available bandwidth routing algorithm and data forwarding method are designed according to the characteristics of traffic. It not only guarantees the demand of service in delay and bandwidth, but also improves the overall throughput of the network, and realizes the load balance of the network to a certain extent.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927
本文编号：2404273
[Abstract]:Space-space network is an integrated information system composed of various types of satellites, adjacent space vehicles and air and ground users. Due to the wide coverage of space-space network and the inability to communicate directly between users who are far away, multi-hop relay is needed to transmit data. Routing technology has become one of the keys to ensure reliable and efficient data transmission. Space-space network has the characteristics of dynamic topology, long link delay, high link error rate and so on. The spatial link state is also affected by node movement, traffic transmission and space environment burst interference. Because of the dynamic change of the network environment, it is necessary to calculate the transmission path dynamically according to the network state when choosing the route, and to adjust the transmission path according to the network state in time in the process of data transmission. At present, there is no mature space-sky network routing technology system, and the existing satellite network and adjacent space platform routing technology can not be fully applied to high-dynamic space-sky networks. In order to ensure the reliable and efficient transmission of data and the diversified business requirements, this paper focuses on the topological structure of the space-space network in view of its characteristics and application requirements. The dynamic routing technology based on the dynamic perception of the network environment is based on the dynamic perception of the network environment and optimizes the transmission path in the space-sky network environment with high dynamic change of link state and transmission services. First of all, in order to ensure different traffic requirements and improve the efficiency of data transmission, this paper constructs a routing optimization model for different types of services to determine the routing optimization objectives of different types of services. Criteria and link state parameters that affect transmission path optimization. Considering the characteristics of long link delay and high bit error rate in space-space network, this paper analyzes the retransmission delay of data packet and introduces it into the routing optimization model to reflect the delay cost of data transmission more accurately. Based on the routing optimization model, in order to optimize the transmission path of different traffic, this paper aims at the dynamic link delay (including propagation delay, retransmission delay, queue delay, etc.), packet loss rate, etc. The three link state parameters of available bandwidth and their time-varying characteristics are studied, and the representation model of network environment is established, especially the queuing delay, and the queuing model based on service priority is established. The queuing time of different priority services is calculated separately to guarantee the real-time traffic and avoid the situation of detour when choosing the optimized path. Based on the establishment of routing optimization model and network environment representation model, a dynamic routing protocol based on environment awareness for space-sky networks is proposed. The network environment awareness mechanism is designed, and bandwidth constrained delay shortest routing algorithm, minimum hops maximum available bandwidth routing algorithm and data forwarding method are designed according to the characteristics of traffic. It not only guarantees the demand of service in delay and bandwidth, but also improves the overall throughput of the network, and realizes the load balance of the network to a certain extent.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN927
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，本文编号：2404273
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