In this work,the impact of hop constraints on the CAPEX of multi-layer IP/MPLS over WSON networks is evaluated under different scenarios. By routing lightpaths with different number of transparent hops,the cost of net...In this work,the impact of hop constraints on the CAPEX of multi-layer IP/MPLS over WSON networks is evaluated under different scenarios. By routing lightpaths with different number of transparent hops,the cost of networks varies significantly. This effect is thoroughly analyzed with a heuristic algorithm for different network topologies belonging to some European network operators. The main conclusion extracted is that limiting the transparent reach in such multi-layer networks can give a good tradeoff between CAPEX of IP/MPLS networks and WSON networks,and even lead to signifi cant savings in CAPEX when compared to longer lightpaths routing strategies.展开更多
In the internet protocol（IP） over multi-granular optical switch network （IP/MG-OXC）, the network node is a typical multilayer switch comprising several layers, the IP packet switching （PXC） layer, wavelength swi...In the internet protocol（IP） over multi-granular optical switch network （IP/MG-OXC）, the network node is a typical multilayer switch comprising several layers, the IP packet switching （PXC） layer, wavelength switching （WXC） layer and fiber switching （FXC） layer. This network is capable of both IP layer grooming and wavelength grooming in a hierarchical manner. Resource provisioning in the multi-granular network paradigm is called hierarchical grooming problem. An integer linear programming （ILP） model is proposed to formulate the problem. An iterative heuristic approach is developed for solving the problem in large networks. Case study shows that IP/MG-OXC network is much more extendible and can significantly save the overall network cost as compared with IP over wavelength division multiplexing network.展开更多
The homomorphic hash algorithm(HHA)is introduced to help on-the-fly verify the vireless sensor network(WSN)over-the-air programming(OAP)data based on rateless codes.The receiver calculates the hash value of a group of...The homomorphic hash algorithm(HHA)is introduced to help on-the-fly verify the vireless sensor network(WSN)over-the-air programming(OAP)data based on rateless codes.The receiver calculates the hash value of a group of data by homomorphic hash function,and then it compares the hash value with the receiving message digest.Because the feedback channel is deliberately removed during the distribution process,the rateless codes are often vulnerable when they face security issues such as packets contamination or attack.This method prevents contaminating or attack on rateless codes and reduces the potential risks of decoding failure.Compared with the SHA1 and MD5,HHA,which has a much shorter message digest,will deliver more data.The simulation results show that to transmit and verify the same amount of OAP data,HHA method sends 17.9% to 23.1%fewer packets than MD5 and SHA1 under different packet loss rates.展开更多
The high-density population leads to crowded cities. The future city is envisaged to encompass a large-scale network with diverse applications and a massive number of interconnected heterogeneous wireless-enabled devi...The high-density population leads to crowded cities. The future city is envisaged to encompass a large-scale network with diverse applications and a massive number of interconnected heterogeneous wireless-enabled devices. Hence, green technology elements are crucial to design sustainable and future-proof network architectures. They are the solutions for spectrum scarcity, high latency, interference, energy efficiency, and scalability that occur in dense and heterogeneous wireless networks especially in the home area network （HAN）. Radio-over-fiber （ROF） is a technology candidate to provide a global view of HAN＇s activities that can be leveraged to allocate orthogonal channel communications for enabling wireless-enabled HAN devices transmission, with considering the clustered-frequency-reuse approach. Our proposed network architecture design is mainly focused on enhancing the network throughput and reducing the average network communications latency by proposing a data aggregation unit （DAU）. The performance shows that with the DAU, the average network communications latency reduces significantly while the network throughput is enhanced, compared with the existing ROF architecture without the DAU.展开更多
随着通信技术的不断发展,基于IP的Gb数据传输(简称Gb over IP)成为GSM-R网络的研究焦点。重点围绕GSM-R系统中BSC/PCU设备以Gb over IP方式接入核心网的方案开展研究,针对BSC/PCU与核心网设备异地设置时,BSC侧无法感知跨传输系统后链路...随着通信技术的不断发展,基于IP的Gb数据传输(简称Gb over IP)成为GSM-R网络的研究焦点。重点围绕GSM-R系统中BSC/PCU设备以Gb over IP方式接入核心网的方案开展研究,针对BSC/PCU与核心网设备异地设置时,BSC侧无法感知跨传输系统后链路中断,导致保护倒换机制未触发引起业务中断的问题,提出3种解决方案,并进行方案比选与优化,为GSM-R系统BSC/PCU设备以Gb over IP方式对接核心网方案提供操作指导及优化建议,以满足铁路移动通信系统多场景下的组网需求。展开更多
IP over WDM网络是下一代网络的核心,生存性则是保证服务质量(QoS的关键要素。当网络中出现故障时,选择在IP层还是光层进行保护和恢复是非常重要的课题。文章在论述IP层和光层的保护和恢复机制的基础上,提出了多层联合恢复机制的思想,...IP over WDM网络是下一代网络的核心,生存性则是保证服务质量(QoS的关键要素。当网络中出现故障时,选择在IP层还是光层进行保护和恢复是非常重要的课题。文章在论述IP层和光层的保护和恢复机制的基础上,提出了多层联合恢复机制的思想,针对多层联合恢复机制中各层之间如何协调进行了仔细的分析,并提出了自己的见解。展开更多
对IP over WDM的虚拓扑设计算法进行了研究,选择网络整体流量的均衡性作为优化目标,提出了一种新型的虚拓扑构造算法。在算法中,选择负载分布方差作为评价流量均衡性的指标,并给出其定义和计算方法。主要针对拥塞概率性能,在光层和IP层...对IP over WDM的虚拓扑设计算法进行了研究,选择网络整体流量的均衡性作为优化目标,提出了一种新型的虚拓扑构造算法。在算法中,选择负载分布方差作为评价流量均衡性的指标,并给出其定义和计算方法。主要针对拥塞概率性能,在光层和IP层将提出的新型虚拓扑构造算法与其他算法进行比较。在光层的算法比较部分,选择负载均衡启发式路由算法(RLBH,routing with load balancing heuristics)与提出的算法进行比较;在IP层的算法比较部分,选择固定路径最小拥塞路由算法(FPLC,fixed-path least-congestion)与提出的算法进行比较,并对比较结果进行了讨论。比较结果显示在拥塞概率性能方面,提出的新型虚拓扑构造算法优于RLBH算法和FPLC算法。展开更多
The problem of stabilizing multiple independent linear systems sharing one common network cable is presented and solved. Both the quantization and time sequencing are studied in the field of control over networks by p...The problem of stabilizing multiple independent linear systems sharing one common network cable is presented and solved. Both the quantization and time sequencing are studied in the field of control over networks by providing the formulated stabilizing sufficient condition which illustrates the relationship between the system instability, quantization and time sequencing,and the data rate is also presented in terms of the quantization and time sequencing. A numerical example is given to illustrate the result.展开更多
本文研究了在IP/MPLS over WDM网络中支持不同QoS要求的VPN业务的逻辑拓扑设计问题。对于给定的网络物理拓扑和业务需求矩阵,本文提出,基于不同时延要求的VPN业务逻辑拓扑设计可以运用两种方法加以解决。一为基于迭代的线性规划方法,适...本文研究了在IP/MPLS over WDM网络中支持不同QoS要求的VPN业务的逻辑拓扑设计问题。对于给定的网络物理拓扑和业务需求矩阵,本文提出,基于不同时延要求的VPN业务逻辑拓扑设计可以运用两种方法加以解决。一为基于迭代的线性规划方法,适合于规模较小的网络。另一个为启发式算法,可运用于网络规模较大的环境。对比仿真结果表明,启发式算法不但较好地解决了不同QoS要求的VPN业务的选路和波长分配问题,还较好地降低了链路的最大负载。展开更多
设计了一种基于Homeplug AV技术利用家用同轴电缆实现家庭HFC网的双向接入设备。介绍了整个系统的设计思路,并对Homeplug AV over Coax设备进行了测试,包括衰减、设备组网、网络节点、传输帧的大小对整个系统的吞吐量、延时的影响,得出...设计了一种基于Homeplug AV技术利用家用同轴电缆实现家庭HFC网的双向接入设备。介绍了整个系统的设计思路,并对Homeplug AV over Coax设备进行了测试,包括衰减、设备组网、网络节点、传输帧的大小对整个系统的吞吐量、延时的影响,得出其性能要比电力线上用好得多,并对Homeplug AV over Coax的应用前景作了分析。展开更多
GRE over IPSec是将GRE封装后的报文又封装到IPSec报文中的一种VPN应用技术,该技术克服了GRE VPN明文传输无加密功能而IPSEC VPN具有加密功能但只能封装在单播报文的缺陷,发挥了GRE和IPSec各自的独特功能,实现了对私网数据单播和组播加...GRE over IPSec是将GRE封装后的报文又封装到IPSec报文中的一种VPN应用技术,该技术克服了GRE VPN明文传输无加密功能而IPSEC VPN具有加密功能但只能封装在单播报文的缺陷,发挥了GRE和IPSec各自的独特功能,实现了对私网数据单播和组播加密传输,是企业构建Intranet/Extranet VPN网络实用技术。展开更多
基金jointly supported by Jiangsu Government Scholarship for Overseas studies,Chinathe open fund of State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University,China(No. 2015GZKF03006)Research Center of Optical Communications Engineering & Technology,Jiangsu Province(No.ZSF0201)
文摘In this work,the impact of hop constraints on the CAPEX of multi-layer IP/MPLS over WSON networks is evaluated under different scenarios. By routing lightpaths with different number of transparent hops,the cost of networks varies significantly. This effect is thoroughly analyzed with a heuristic algorithm for different network topologies belonging to some European network operators. The main conclusion extracted is that limiting the transparent reach in such multi-layer networks can give a good tradeoff between CAPEX of IP/MPLS networks and WSON networks,and even lead to signifi cant savings in CAPEX when compared to longer lightpaths routing strategies.
基金Sponsored by Agency for Singapore Technology and Advance Research(RGM01/16)
文摘In the internet protocol（IP） over multi-granular optical switch network （IP/MG-OXC）, the network node is a typical multilayer switch comprising several layers, the IP packet switching （PXC） layer, wavelength switching （WXC） layer and fiber switching （FXC） layer. This network is capable of both IP layer grooming and wavelength grooming in a hierarchical manner. Resource provisioning in the multi-granular network paradigm is called hierarchical grooming problem. An integer linear programming （ILP） model is proposed to formulate the problem. An iterative heuristic approach is developed for solving the problem in large networks. Case study shows that IP/MG-OXC network is much more extendible and can significantly save the overall network cost as compared with IP over wavelength division multiplexing network.
基金Supported by the National Science and Technology Support Program(Y2140161A5)the National High Technology Research and Development Program of China(863Program)(O812041A04)
文摘The homomorphic hash algorithm(HHA)is introduced to help on-the-fly verify the vireless sensor network(WSN)over-the-air programming(OAP)data based on rateless codes.The receiver calculates the hash value of a group of data by homomorphic hash function,and then it compares the hash value with the receiving message digest.Because the feedback channel is deliberately removed during the distribution process,the rateless codes are often vulnerable when they face security issues such as packets contamination or attack.This method prevents contaminating or attack on rateless codes and reduces the potential risks of decoding failure.Compared with the SHA1 and MD5,HHA,which has a much shorter message digest,will deliver more data.The simulation results show that to transmit and verify the same amount of OAP data,HHA method sends 17.9% to 23.1%fewer packets than MD5 and SHA1 under different packet loss rates.
基金supported by the Ministry of Higher Education,Malaysia under Scholarship of Hadiah Latihan Persekutuan under Grant No.KPT.B.600-19/3-791206065445
文摘The high-density population leads to crowded cities. The future city is envisaged to encompass a large-scale network with diverse applications and a massive number of interconnected heterogeneous wireless-enabled devices. Hence, green technology elements are crucial to design sustainable and future-proof network architectures. They are the solutions for spectrum scarcity, high latency, interference, energy efficiency, and scalability that occur in dense and heterogeneous wireless networks especially in the home area network （HAN）. Radio-over-fiber （ROF） is a technology candidate to provide a global view of HAN＇s activities that can be leveraged to allocate orthogonal channel communications for enabling wireless-enabled HAN devices transmission, with considering the clustered-frequency-reuse approach. Our proposed network architecture design is mainly focused on enhancing the network throughput and reducing the average network communications latency by proposing a data aggregation unit （DAU）. The performance shows that with the DAU, the average network communications latency reduces significantly while the network throughput is enhanced, compared with the existing ROF architecture without the DAU.
文摘随着通信技术的不断发展,基于IP的Gb数据传输(简称Gb over IP)成为GSM-R网络的研究焦点。重点围绕GSM-R系统中BSC/PCU设备以Gb over IP方式接入核心网的方案开展研究,针对BSC/PCU与核心网设备异地设置时,BSC侧无法感知跨传输系统后链路中断,导致保护倒换机制未触发引起业务中断的问题,提出3种解决方案,并进行方案比选与优化,为GSM-R系统BSC/PCU设备以Gb over IP方式对接核心网方案提供操作指导及优化建议,以满足铁路移动通信系统多场景下的组网需求。
文摘IP over WDM网络是下一代网络的核心,生存性则是保证服务质量(QoS的关键要素。当网络中出现故障时,选择在IP层还是光层进行保护和恢复是非常重要的课题。文章在论述IP层和光层的保护和恢复机制的基础上,提出了多层联合恢复机制的思想,针对多层联合恢复机制中各层之间如何协调进行了仔细的分析,并提出了自己的见解。
文摘对IP over WDM的虚拓扑设计算法进行了研究,选择网络整体流量的均衡性作为优化目标,提出了一种新型的虚拓扑构造算法。在算法中,选择负载分布方差作为评价流量均衡性的指标,并给出其定义和计算方法。主要针对拥塞概率性能,在光层和IP层将提出的新型虚拓扑构造算法与其他算法进行比较。在光层的算法比较部分,选择负载均衡启发式路由算法(RLBH,routing with load balancing heuristics)与提出的算法进行比较;在IP层的算法比较部分,选择固定路径最小拥塞路由算法(FPLC,fixed-path least-congestion)与提出的算法进行比较,并对比较结果进行了讨论。比较结果显示在拥塞概率性能方面,提出的新型虚拓扑构造算法优于RLBH算法和FPLC算法。
基金This work was financially supported by China Scholarship Council (21937016)
文摘The problem of stabilizing multiple independent linear systems sharing one common network cable is presented and solved. Both the quantization and time sequencing are studied in the field of control over networks by providing the formulated stabilizing sufficient condition which illustrates the relationship between the system instability, quantization and time sequencing,and the data rate is also presented in terms of the quantization and time sequencing. A numerical example is given to illustrate the result.
文摘本文研究了在IP/MPLS over WDM网络中支持不同QoS要求的VPN业务的逻辑拓扑设计问题。对于给定的网络物理拓扑和业务需求矩阵,本文提出,基于不同时延要求的VPN业务逻辑拓扑设计可以运用两种方法加以解决。一为基于迭代的线性规划方法,适合于规模较小的网络。另一个为启发式算法,可运用于网络规模较大的环境。对比仿真结果表明,启发式算法不但较好地解决了不同QoS要求的VPN业务的选路和波长分配问题,还较好地降低了链路的最大负载。
文摘设计了一种基于Homeplug AV技术利用家用同轴电缆实现家庭HFC网的双向接入设备。介绍了整个系统的设计思路,并对Homeplug AV over Coax设备进行了测试,包括衰减、设备组网、网络节点、传输帧的大小对整个系统的吞吐量、延时的影响,得出其性能要比电力线上用好得多,并对Homeplug AV over Coax的应用前景作了分析。
