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Zhao T.,Xian University of Technology | Zhao T.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | Li Q.,Xian University of Technology | Song P.,Xian University of Technology | Song P.,Polytechnic University of Mozambique
Computers and Electrical Engineering

The Ultraviolet (UV) Non-line-of-sight (NOLS) communications are becoming a research hotspot in recent years. For wireless UV networks, there are some well-known existing issues such as network connectivity, power control and channel assignment. In this paper, a Fast Power Control and Channel Assignment scheme (FPCCA) is proposed to reduce interference and save energy. Firstly, the FPCCA is compared with the traditional channel assignment which without power control. It is proved that the approach of FPCCA can save energy more than 10%. Then, the FPCCA is both applied in the UV and Wireless Mesh Networks (WMN). The performance of FPCCA with different angles and network traffic loads is simulated and analyzed. When the traffic load is fixed, the performance metrics of FPCCA in UV are better than that in WMN. Meanwhile, the FPCCA not only ensures the quickness and accuracy of channel assignment, but also saves energy and improves the throughput. © 2015 Elsevier Ltd. Source

He R.,Dalian Maritime University | He R.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | Lin B.,Dalian Maritime University
Journal of Communications

In this paper, we investigate the dynamic establishment of dependable connections in wavelength division multiplexing (WDM) mesh networks with the objectives of power saving and resource efficiency. According to the resource usage, i.e., assigned for primary paths, backup paths or free, and the state of network components (nodes and fiber links), i.e., active, sleep or off, we propose a dynamic power-aware shared path protection (DPA-SPP) algorithm. In order to reduce power consumption, to improve sharing of spare capacity, and to reduce blocking probability for connection requests, DPASPP encourages to establish a primary path for each connection request on active resources, to pack backup paths on sleep resources, and to leave more idle resources for future connection requests as far as possible while with a consideration to prevent a link with a very few number of free wavelengths to become a bottleneck link, which is beneficial to further improve the successful probability of connection establishments. Based on dynamic traffic with different load, the performance of DPA-SPP has been investigated via extensive simulations. The results show that DPA-SPP can efficiently improve the spare resource sharing and reduce the blocking probability while still achieving a considerable energy saving. © 2013 Engineering and Technology Publishing. Source

Chen C.,Hefei University of Technology | Chen C.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | Chen X.,Hefei University of Technology | Chen X.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | And 4 more authors.
ICOCN 2015 - 14th International Conference on Optical Communications and Networks, Proceedings

This work investigates the service provisioning in multi-domain software-defined elastic optical networks (SDEONs) by taking advantage of the centralized network control and management (NC&M) provided by OpenFlow (OF). We design two control plane frameworks, and discuss the corresponding service provisioning schemes in them. The frameworks are also implemented and experimentally demonstrated in a multi-national control plane testbed that consists of two SD-EON domains in China and USA, respectively. © 2015 IEEE. Source

Chen X.,Hefei University of Technology | Chen X.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | Zhu S.,Hefei University of Technology | Zhu S.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | And 8 more authors.
Conference Proceedings - 2015 International Conference on Optical Network Design and Modeling, ONDM 2015

Multipath provisioning (MPP) in elastic optical networks (EONs) can improve the network performance effectively. In this paper, we study the protection schemes for MPP to ensure 100% restoration against single-link failures. We design three algorithms, namely, Instant-ILP, PWCE-MPP and mPWCEMPP. The first one leverages a simple integer linear programming (ILP) model to design the optimal working-backup structure for each request instantly, while the rest two utilize protected working capacity envelop (PWCE) and spectrum planning to further reduce bandwidth blocking probability (BBP). Moreover, mPWCE-MPP considers the differences among working and backup paths, and ensures that the maximum path-difference (MPD) of a request will not increase dramatically in restoration. Simulation results show that mPWCE-MPP can obtain the best trade-off between BBP and average MPD. © 2015 International Federation for Information Processing (IFIP). Source

Chen X.,Anhui University of Science and Technology | Chen X.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | Ji F.,Anhui University of Science and Technology | Ji F.,Key Laboratory of Optical Fiber Sensing and Communications UESTC | And 6 more authors.
Photonic Network Communications

The tremendous transmission capacity and flexible spectrum allocation scheme make elastic optical networks (EONs) one of the most promising infrastructures for constructing the interconnection in datacenter (DC) networks. Meanwhile, as DC traffics exhibit highly dynamic and heterogeneous features, differentiated service provisioning schemes are desired. In this paper, we take the advantage of centralized network control and management provided by the software-defined elastic optical networks (SD-EONs) and investigate availability-aware service provisioning in SD-EON-based inter-datacenter (inter-DC) networks. We first describe the problem of availability-aware service provisioning in SD-EON-based inter-DC networks and present the theoretical analysis for service availability. Then, we propose an availability-aware service provisioning algorithm (ASP) that leverages different path protection schemes to satisfy different service availability requirements. A service downgrading (SD) strategy is also designed as a supplement of ASP to further improve its performance. Simulation results show that the proposed ASP-SD algorithm can effectively improve the spectrum efficiency without sacrificing availability. © 2015 Springer Science+Business Media New York Source

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