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| 面向LEO卫星网的轻量级按需QoS源路由算法 | |
| 引用本文： | 朱 军,饶 元,李绍稳,邵星.面向LEO卫星网的轻量级按需QoS源路由算法[J].计算机科学,2012,39(7):64-68. |
| 作者姓名： | 朱 军 饶 元 李绍稳 邵星 |
| 作者单位： | 1. 安徽农业大学信息与计算机学院 合肥230036 2. 安徽农业大学信息与计算机学院 合肥230036;南京邮电大学计算机学院 南京210003 3. 南京邮电大学计算机学院 南京210003 |
| 基金项目： | 国家自然科学基金，安徽省高校省级自然科学研究重点项目 |
| 摘 要： | 接入卫星切换、流量分布不均匀和星上处理能力受限等因素使LEO卫星网的QoS路由面临巨大挑战。提出了一种引入移动代理技术的轻量级按需QoS源路由算法。首先结合星际链路队列占用情况设计了星际链路可用指数;接着基于卫星网承载流量分布特点提出了卫星可用指数;综合星际链路和卫星可用指数给出了移动代理迁移策略、星际QoS路由及其重建算法。仿真结果表明,提出的路由算法信令开销低,时延抖动、新呼叫阻塞率和切换呼叫阻塞率等QoS性能明显优于传统路由算法。 |
| 关 键 词： | LEO卫星网 移动代理 QoS 路由算法 |
Lightweight On-demand QoS Source Routing for LEO Satellite Network |
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| ZHU Jun , RAO Yuan , LI Shao-wen , SHAO Xing.Lightweight On-demand QoS Source Routing for LEO Satellite Network[J].Computer Science,2012,39(7):64-68. | |
| Authors: | ZHU Jun RAO Yuan LI Shao-wen SHAO Xing |
| Affiliation: | 2(College of Information and Computer,Anhui Agricultural University,Hefei 230036,China)1(School of Computer Science & Technology,Nanjing University of Posts and Telecommunications,Nanjing 210003,China)2 |
| Abstract: | QoS routing for LEO(Low Earth Orbit) satellite network faces great challenges due to several issues, such as, ingress satellite handover, unbalanced distribution of traffic and the limited on-board processing ability. A light-weight on-demand QoS source routing algorithm using mobile agent was proposed. Firstly,ISL(inter-satellite link) availability index was designed considering ISL utility. Secondly, satellite availability index was put forward based on traffic distribution undertaken by satellite network. hhirdly, the migration strategy of mobile agent was given taking both indexes into account. Consequcntly,ISI. routing and rerouting were presented in detail. Simulation results demonstrate that the proposed approach has lower signaling overhead, better delay fitter, new call blocking probability and handover blocking probability than the traditional methods. |
| Keywords: | LEO satellite network Mobile agent QoS Routing algorithm |
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