针对低轨卫星网络中链路频繁断裂、路径恢复延迟长以及传统单路径路由协议可靠性差等问题,本文构建了一种融合轨道动态性与链路状态感知的网络模型,提出了一种基于多路径自组织按需距离向量(multipath ad hoc on-demand distance vector...针对低轨卫星网络中链路频繁断裂、路径恢复延迟长以及传统单路径路由协议可靠性差等问题,本文构建了一种融合轨道动态性与链路状态感知的网络模型,提出了一种基于多路径自组织按需距离向量(multipath ad hoc on-demand distance vector,MAODV)的自适应路由优化方法。该算法基于按需触发的路由发现机制,在距离向量扩散过程中同时获取并维护多条可达路径,形成候选路径集合,再结合轨道变化引起的链路可用性波动,实时采集路径跳数、链路质量、节点负载和剩余能量等跨层参数,构建综合路径代价,以选择更加适应动态拓扑的主路径及备用路径。本文基于MATLAB与STK(Satellite Tool Kit)构建联合仿真环境,通过与其他协议的对比实验验证了所提算法在吞吐量、时延方面的优越性。仿真结果表明,在相同星座与业务条件下,所提方法在平均吞吐量方面相较自组织按需距离向量路由(ad hoc on-demand distance vector,AODV)协议、动态源路由(dynamic source routing,DSR)协议与优化链路状态路由(optimized link state routing,OLSR)协议显著提升;平均端到端时延比三者明显降低,从而验证了所提算法在动态低轨拓扑中的性能优势。展开更多
The multi-hop wireless networks that provide the feasible means of communication and information access in real time services are named as Mobile Ad-hoc Networks (MANETS). The Dual Busy-Tone Multiple Access (DBTMA) me...The multi-hop wireless networks that provide the feasible means of communication and information access in real time services are named as Mobile Ad-hoc Networks (MANETS). The Dual Busy-Tone Multiple Access (DBTMA) mechanism concedes the RTS-CTS scheme to establish communication between two nodes and medium access for applications with a high QoS requirement by assigning two narrow band busy-tones to notify the on-going transmission. In this paper, we obtained results relative to the interest of AODV based reactive routing protocol for MANETS and DBTMA mechanism. The performance is governed under real time sound traffic through simulation using NS-2. The performance of the protocol is measured in terms of various QoS metrics that include route discovery time, throughput, delay and hops per route which are calculated, and graphs have been plotted. A simulation result shows that very substantial improvements in terms of AODV performance parameters and minimum delay are attained due to increased routing responsiveness.展开更多
文摘针对低轨卫星网络中链路频繁断裂、路径恢复延迟长以及传统单路径路由协议可靠性差等问题,本文构建了一种融合轨道动态性与链路状态感知的网络模型,提出了一种基于多路径自组织按需距离向量(multipath ad hoc on-demand distance vector,MAODV)的自适应路由优化方法。该算法基于按需触发的路由发现机制,在距离向量扩散过程中同时获取并维护多条可达路径,形成候选路径集合,再结合轨道变化引起的链路可用性波动,实时采集路径跳数、链路质量、节点负载和剩余能量等跨层参数,构建综合路径代价,以选择更加适应动态拓扑的主路径及备用路径。本文基于MATLAB与STK(Satellite Tool Kit)构建联合仿真环境,通过与其他协议的对比实验验证了所提算法在吞吐量、时延方面的优越性。仿真结果表明,在相同星座与业务条件下,所提方法在平均吞吐量方面相较自组织按需距离向量路由(ad hoc on-demand distance vector,AODV)协议、动态源路由(dynamic source routing,DSR)协议与优化链路状态路由(optimized link state routing,OLSR)协议显著提升;平均端到端时延比三者明显降低,从而验证了所提算法在动态低轨拓扑中的性能优势。
文摘The multi-hop wireless networks that provide the feasible means of communication and information access in real time services are named as Mobile Ad-hoc Networks (MANETS). The Dual Busy-Tone Multiple Access (DBTMA) mechanism concedes the RTS-CTS scheme to establish communication between two nodes and medium access for applications with a high QoS requirement by assigning two narrow band busy-tones to notify the on-going transmission. In this paper, we obtained results relative to the interest of AODV based reactive routing protocol for MANETS and DBTMA mechanism. The performance is governed under real time sound traffic through simulation using NS-2. The performance of the protocol is measured in terms of various QoS metrics that include route discovery time, throughput, delay and hops per route which are calculated, and graphs have been plotted. A simulation result shows that very substantial improvements in terms of AODV performance parameters and minimum delay are attained due to increased routing responsiveness.
