宽带网络若干关键技术研究
摘要
随着以因特网为核心的数据业务的持续发展,以电话业务为主要服务对象的传统电信网络的带宽已经不能满足适配IP业务的传送需求,网络的宽带化已成为发展下一代网络的一个重要议题。网络的宽带化是一个系统工程,它既包括核心网络的宽带化,也包含接入网络的宽带化,哪个环节的滞后都可能成为网络的瓶颈,使用户无法真正享受宽带服务,因而围绕宽带网络关键技术进行研究是非常必要的。
本论文在教育部留学人员基金项目的支持下,在对现有数据网络技术特点进行详细分析的基础上,着重就宽带网络中的若干关键技术进行了研究。论文的主要创新性工作如下:
1.提出了两级结构的设想,即核心网络和接入网络。核心网络将负责提供大容量、无状态的数据调度,而流量控制等内容则由边缘节点来完成。在此基础上进而提出一种与消耗量有关的无状态核心节点调度算法,并对该算法下的数据调度性能进行了仿真分析,结果显示可使与用户所缴费用相对应的消耗量和网络所提供的服务性能成大致线性关系。
2.提出一种基于消耗量的无状态核心网络的路由算法,并根据此算法计算出网状核心网络模型的链路开销,进而选出最佳路径。这种算法既可使无状态网络具有可扩展性和鲁棒性,又能够以消耗量为依据使用户所缴费用与其所获得的服务性能相关联。
3.提出一种基于比例分配的跨层分布式无线mesh网络调度算法(PDCS),该算法有效地结合了跨层设计的思想和自适应调制(AMC)技术来提高网络的性能。仿真结果显示,该算法下网络的吞吐量和公平性都得到了明显的提升。
4、提出基于节点发现算法的多路径路由协议,在该协议中引入跨层的概念和节点发现算法。利用节点发现算法可解决多路径交叉问题以提高网络的可靠性和快速移动性,满足不同业务的QoS需求。仿真结果显示,所提出的路由协议能够获得比OLSR协议更低的时延和丢包率,可支持无线终端的快速移动性。
5、最后针对采用OFDM技术和ROF技术相结合的OFDM-ROF光无线传输系统在未来宽带网络中的应用进行了分析研究,并提出基于信道估计的采用光纤信道和无线信道联合自适应调制技术的OFDM-ROF系统模型,以减小光纤系统和多径无线信道中的非线性综合影响。
With the increasing development of digital services based on Internet,the bandwidth of traditional telecommunication network designed for telephone service is adverse to deliver IP service.Hence,for next generation network,the broadband of network has becoming one of the hot topics.Broadband of network is a kind of system engineerings, which includes not only broadband of core network,but also broadband of access network. If any of them is delayed,network charcterestics will be influenced,and thus subscribers will not be able to enjoy broadband services.
Sponsored by the Education & Research Fund of the Scholars returned from oversea provided by National Education our innovative research in this dissertation is listed as follow:
1.A two-level network is firstly proposed in the future network.It is considered to provide one kind of high rate and digital schemes among stateless core nodes. The congestion control scheme is completed by edge nodes.A scheduling algorithm on cost in stateless core nodes is proposed in this paper,and the simulation analysis is given according to this algorithm.It is resulted that the cost would be nearly linear with the service performance provided in the network..
2.A routing algorithm on cost in the stateless core network is proposed to make the Internet highly scalable and robust in this paper.According to this algorithm,the link cost of a mesh core network model can be calculated and the optimized route is selected.
3.Based on the coordinated distribution nework model,a new proportional-based distributed wireless-network cross-layer scheduling algorithm is proposed in this paper.The core of this algorithm is the introduction of cross-layer design and adaptive madulation,meaning that in order to distribute the wireless resources efficiently and improve in fairness of the network.The simulation results show that the thuoughout and fireness network are improved.
4.A proactive multipath optimized link state routing protocol(MOLSR) based on optimized link state routing protocol(OLSR),which introduces the cross-layer concept as well as the node discovery algorithm employed to discover every node on the route to build disjoint paths.The simulation results show that MOLSR achieves lower delay and packet dropping ratio with little more overhead than the classic OLSR algorithm.
5.The amplication on an OFDM-ROF optical wireless transmission system for the future broadband network is finally researched through the system simulation. We present a OFDM-ROF system model based on chanal estimation and adaptive modulation technology to mitigate its nonlinear integrated influence in the fiber and wireless chanal.
本论文在教育部留学人员基金项目的支持下,在对现有数据网络技术特点进行详细分析的基础上,着重就宽带网络中的若干关键技术进行了研究。论文的主要创新性工作如下:
1.提出了两级结构的设想,即核心网络和接入网络。核心网络将负责提供大容量、无状态的数据调度,而流量控制等内容则由边缘节点来完成。在此基础上进而提出一种与消耗量有关的无状态核心节点调度算法,并对该算法下的数据调度性能进行了仿真分析,结果显示可使与用户所缴费用相对应的消耗量和网络所提供的服务性能成大致线性关系。
2.提出一种基于消耗量的无状态核心网络的路由算法,并根据此算法计算出网状核心网络模型的链路开销,进而选出最佳路径。这种算法既可使无状态网络具有可扩展性和鲁棒性,又能够以消耗量为依据使用户所缴费用与其所获得的服务性能相关联。
3.提出一种基于比例分配的跨层分布式无线mesh网络调度算法(PDCS),该算法有效地结合了跨层设计的思想和自适应调制(AMC)技术来提高网络的性能。仿真结果显示,该算法下网络的吞吐量和公平性都得到了明显的提升。
4、提出基于节点发现算法的多路径路由协议,在该协议中引入跨层的概念和节点发现算法。利用节点发现算法可解决多路径交叉问题以提高网络的可靠性和快速移动性,满足不同业务的QoS需求。仿真结果显示,所提出的路由协议能够获得比OLSR协议更低的时延和丢包率,可支持无线终端的快速移动性。
5、最后针对采用OFDM技术和ROF技术相结合的OFDM-ROF光无线传输系统在未来宽带网络中的应用进行了分析研究,并提出基于信道估计的采用光纤信道和无线信道联合自适应调制技术的OFDM-ROF系统模型,以减小光纤系统和多径无线信道中的非线性综合影响。
With the increasing development of digital services based on Internet,the bandwidth of traditional telecommunication network designed for telephone service is adverse to deliver IP service.Hence,for next generation network,the broadband of network has becoming one of the hot topics.Broadband of network is a kind of system engineerings, which includes not only broadband of core network,but also broadband of access network. If any of them is delayed,network charcterestics will be influenced,and thus subscribers will not be able to enjoy broadband services.
Sponsored by the Education & Research Fund of the Scholars returned from oversea provided by National Education our innovative research in this dissertation is listed as follow:
1.A two-level network is firstly proposed in the future network.It is considered to provide one kind of high rate and digital schemes among stateless core nodes. The congestion control scheme is completed by edge nodes.A scheduling algorithm on cost in stateless core nodes is proposed in this paper,and the simulation analysis is given according to this algorithm.It is resulted that the cost would be nearly linear with the service performance provided in the network..
2.A routing algorithm on cost in the stateless core network is proposed to make the Internet highly scalable and robust in this paper.According to this algorithm,the link cost of a mesh core network model can be calculated and the optimized route is selected.
3.Based on the coordinated distribution nework model,a new proportional-based distributed wireless-network cross-layer scheduling algorithm is proposed in this paper.The core of this algorithm is the introduction of cross-layer design and adaptive madulation,meaning that in order to distribute the wireless resources efficiently and improve in fairness of the network.The simulation results show that the thuoughout and fireness network are improved.
4.A proactive multipath optimized link state routing protocol(MOLSR) based on optimized link state routing protocol(OLSR),which introduces the cross-layer concept as well as the node discovery algorithm employed to discover every node on the route to build disjoint paths.The simulation results show that MOLSR achieves lower delay and packet dropping ratio with little more overhead than the classic OLSR algorithm.
5.The amplication on an OFDM-ROF optical wireless transmission system for the future broadband network is finally researched through the system simulation. We present a OFDM-ROF system model based on chanal estimation and adaptive modulation technology to mitigate its nonlinear integrated influence in the fiber and wireless chanal.
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[1]Yin,Hujun,Alamouti,Siavash;OFDMA:A Broadband Wireless Access Technology,Sarnoff Symposium,2006 IEEE,Page(s):1-4
[2]Morelli,M.;Kuo,C.-C.J.;Pun,M.-O.;Synchronization Techniques for Orthogonal Frequency Division Multiple Access(OFDMA):A Tutorial Review,Proceedings of the IEEE Volume 95,Issue 7,July 2007 Page(s):1394 - 1427
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[4]Jae-Woo So;Performance Analysis of VoIP Services in the IEEE 802.16e OFDMA System With Inband Signaling,Vehicular Technology,IEEE Transactions on Volume 57,Issue 3,May 2008 Page(s):1876 - 1886
[5]Gabriella di Benedetto,M.;Yingbo Hua;Kaiser,T.;Xiaodong Wang;Cognitive Radio Technology,Signal Processing Magazine,IEEE Volume 25,Issue 6,November 2008Page(s):10 - 198
[6]Youping Zhao;Shiwen Mao;Neel,J.O.;Reed,J.H.;Performance Evaluation of Cognitive Radios:Metrics,Utility Functions,and Methodology,Proceedings of the IEEE Volume 97, Issue 4, April 2009 Page(s):642 - 659
[7] Damljanovic, Z.; Cognitive radio access discovery strategies。 Communication Systems,Networks and Digital Signal Processing, 2008. CNSDSP 2008. 6th International Symposium on 25-25 July 2008 Page(s):251 - 255
[8] Jiang, M.; Akhtman, J.; Hanzo, L.;Soft-Information Assisted Near-Optimum Nonlinear Detection for BLAST-type Space Division Multiplexing OFDM Systems 。 Wireless Communications, IEEE Transactions on Volume 6, Issue 4, April 2007 Page(s):1230 -1234
[9] Rahmna, M.I.; Marchetti, N.; Fitzek, F.; Prasad, R.; Non-Linear Detection for Joint Space-Frequency Block Coding and Spatial Multiplexing in OFDM-MIMO Systems。Wireless Communication Systems, 2005. 2nd International Symposium on 7-7 Sept. 2005 Page(s):524 - 528
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