Author Affiliations
Abstract
1 State Key Laboratory of Information Photonics and Optical Communication, Beijing University of Posts and Telecommunications, Beijing 100876, China
2 University of Texas at Dallas, Texas 75080, USA
In this Letter, we propose two crosstalk-aware routing, core, and spectrum assignment (CA-RCSA) algorithms for spatial division multiplexing enabled elastic optical networks (SDM-EONs) with multi-core fibers. First, the RCSA problem is modeled, and then a metric, i.e., CA spectrum compactness (CASC), is designed to measure the spectrum status in SDM-EONs. Based on CASC, we propose two CA-RCSA algorithms, the first-fit (FF) CASC algorithm and the random-fit (RF) CASC algorithm. Simulation results show that our proposed algorithms can achieve better performance than the baseline algorithm in terms of blocking probability and spectrum utilization, with FF-CASC providing the best performance.
060.1155 All-optical networks 060.4250 Networks 060.4251 Networks, assignment and routing algorithms Chinese Optics Letters
2016, 14(10): 100604
重庆邮电大学 移动通信技术重庆市重点实验室, 重庆400065
针对机会社会网络中RADR (机会社会网络消息传送算法)存在消息传输时延偏大和消息传输成功率偏低的问题, 提出一种ECRA (基于社区的高效的机会社会网络路由算法)。ECRA只选取与消息目的节点在同一个社区的邻居节点来计算重要度, 并且利用连通拓扑侦听相遇节点, 检测相遇节点的邻居节点中是否存在更高重要度的节点, 若存在, 则利用相遇节点将消息传递给具有更高重要度的邻居节点。理论分析和仿真结果表明, ECRA与RADR及相关对比算法比较, 在消息传输成功率、平均端到端时延等方面的性能均得到了提升。
机会社会网络 路由算法 社区 重要度 侦听机制 opportunistic social networks routing algorithms communities important degree interceptionmechanism
Author Affiliations
Abstract
1 State Key Laboratory of Integrated Service Networks, School of Telecommunications Engineering, Xidian University, Xi’an 710071, China
2 School of Physics and Optoelectronic Engineering, Xidian University, Xi’an 710071, China
3 Key Laboratory of the Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices, School of Microelectronics, Xidian University, Xi’an 710071, China
The average bit error rate (BER) performance of a free-space optical (FOS) system based on the multi-hop parallel decode-and-forward cooperative communication method with an M-ary phase shift keying subcarrier intensity modulation is studied systematically. With the max–min criterion as the best path selection scheme, the probability density function and the cumulative distribution function of the gamma–gamma distribution random variable signal-to-noise ratio are derived. The analytical BER expression is then obtained in terms of the Gauss–Laguerre quadrature rule. Monte Carlo simulation is also provided to confirm the validity of the presented average BER model.
010.1300 Atmospheric propagation 010.1330 Atmospheric turbulence 060.2605 Free-space optical communication 060.4251 Networks, assignment and routing algorithms Chinese Optics Letters
2015, 13(8): 080101
Author Affiliations
Abstract
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
The rapid growth of the Internet raises the importance of resource planning of Internet protocol (IP) over elastic optical networks (EONs), which is a challenging task due to more complex and obscure physical -constraints of it. Compared with network cost, the power consumption may eventually become the barrier to the expansion of the Internet. We present an energy-efficient virtual topology design (VTD) scheme for IP over EON. We explicitly explain and analyze the mixed integer linear programming model and the heuristic algorithm for this scheme. Numerical results show that the proposed VTD scheme can significantly save power consumption.
060.1155 All-optical networks 060.4251 Networks, assignment and routing algorithms 060.4256 Networks, network optimization Chinese Optics Letters
2014, 12(11): 110602
1 西安电子科技大学 综合业务网国家重点实验室, 西安 710071
2 西安交通大学 电信学院, 西安 710049
3 武汉邮电科学研究院 烽火通信有限公司, 武汉 430074
弹性光网络可大幅度提高频谱利用率并为用户提供灵活的带宽粒度.为改进已有弹性光网络的选路与频谱分配算法，建立了描述弹性光网络中选路与频谱分配问题的整数线性规划模型，提出两种分别基于最多频隙数优先和最长路径优先与业务疏导结合的启发式算法，以进一步提高频谱利用率，设计了所提算法的重排序准则和流程.对小型6结点、中型14结点和大型19结点等三种不同网络拓扑进行仿真实验，结果表明，所提算法可有效提高已有算法的频谱利用率.
选路算法 启发式算法 性能评估 选路与频谱分配 业务疏导 弹性光网络 整数线性规划 Routing algorithms Heuristic algorithms Performance evaluation Routing and spectrum assignment Traffic grooming Elastic optical networks Integer linear programming
Author Affiliations
Abstract
A domain-level gradient-based routing (DLR) algorithm for heterogeneous optical networks with synchronous digital hierarchy and optical transport network domains is proposed and experimentally validated. This algorithm classifies domains into groups with incremental levels on the basis of domain-level partitioning, and guides paths level by level along a gradient on the basis of interdomain routing tree evolution. The proposed algorithm is implemented in the hierarchical path computation element-based control architecture for connection provisioning. Testbeds with commercial and emulated nodes are established to verify the feasibility and performance of the algorithm. Experimental and emulation results show that DLR effectively performs in terms of network blocking probability, real time characteristics, and scalability.
060.4250 Networks 060.4251 Networks, assignment and routing algorithms Chinese Optics Letters
2013, 11(9): 090601
Author Affiliations
Abstract
A quality-of-service (QoS) aware scheme, called precautionary performance monitoring, is proposed to solve the optical impairments and congestion control in coherent optical orthogonal frequency division multiplexed (CO-OFDM) networks. The centralized path computation element (PCE) extensions based on the QoS level are applied to optical performance monitoring in this letter.
060.1660 Coherent communications 060.2330 Fiber optics communications 060.4251 Networks, assignment and routing algorithms 280.4788 Optical sensing and sensors Chinese Optics Letters
2012, 10(4): 040602
Author Affiliations
Abstract
Transport network paths are typically bidirectional and symmetrical. In multi-protocol label switching (MPLS) and generalized MPLS (GMPLS) mechanisms, independent labels are distributed for bidirectional paths. Thus, the requirement of the MPLS transport profile (MPLS-TP), which is a new transport technology, could not be satisfied efficiently. A novel label distribution mechanism for bidirectional paths in MPLS-TP networks is proposed. Labels distributed by the mechanism are symmetrical and can reflect the pairing relationship of the forward and backward directions of the transport path.
060.4251 Networks, assignment and routing algorithms 060.4259 Networks, packet-switched Chinese Optics Letters
2012, 10(2): 020604
Author Affiliations
Abstract
1 College of Computer Science and Engineering, Hefei University of Technology, Hefei 230009, China
2 Department of Computer Science and Engineering, Wright State University, 3640 Colonel Glenn Highway, Dayton, Ohio, 45435, USA
Signal degradation due to physical impairments may result in unacceptable bit-error rates of received signals at the destination. Based on earlier work, we study the impairment-aware quality of service (QoS) provisioning problem in dual-header optical burst switching (OBS) networks that employ two control packets for each data burst. At an OBS node, the proposed algorithm schedule bursts for transmission by searching for available resources using admission control and preemption. The algorithm also verifies signal quality. Simulation results show that this algorithm is effective in providing QoS support in OBS networks while considering physical impairment effects.
光突发交换 光突发调度 损耗感知的服务区分 060.1155 All-optical networks 060.4251 Networks, assignment and routing algorithms 060.4510 Optical communications Chinese Optics Letters
2011, 9(7): 070602
