Optical Transport Network

About: Optical Transport Network is a research topic. Over the lifetime, 6055 publications have been published within this topic receiving 85783 citations.

Enabling subwavelength level traffic grooming in survivable WDM optical network design

Abstract: The explosion of data traffic and the availability of huge bandwidth using WDM optical network make it important to study optical layer networking restoration design. This paper addresses problem of enabling traffic grooming in mesh survivable WDM optical network design. Traffic grooming in optical network is defined as the act of multiplexing, demultiplexing and switching lower rate traffic onto high capacity lightpaths. The path selection and wavelength assignment schemes are formulated as integer linear programming (ILP) optimization problems. Two exact formulations are given for employing backup multiplexing and dedicated backup reservation with minimizing the total link-primary-sharing.

Towards fifth-generation (5G) optical transport networks

Abstract: Currently, optical communication systems and networks undergo a radical change from traditional static architectures to more dynamic, flexible, adaptive and energy efficient concepts. In this paper, we briefly review emerging technologies and approaches for future optical networks that will be able to meet the high requirements of current and emerging applications. Such high-capacity, ubiquitous, flexible and energy efficient optical networks are referred here to as fifth-generation (5G) optical transport networks.

Optical layer survivability: a post-bubble perspective

Abstract: We revisit the topic of optical layer protection from a motivation and deployment perspective. We first discuss the changes that have occurred in optical networking in general and the implications for protection. We then discuss scenarios where optical protection makes sense, recognizing that other fast protection schemes at the client layer provide viable alternatives in certain cases. Our conclusion is that optical protection makes sense for metro networks, as long as they are based on simple dedicated schemes. When it gets to more complex shared ring and mesh protection, we believe that OEO-based schemes are more viable, whether crossconnect-based or packet-switch-based.

Demonstration of dynamic resource sharing benefits in an optical C-RAN

Abstract: The next generation of mobile communication (i.e., 5G) will bring new challenges for the transport infrastructure, e.g., in terms of flexibility and capacity. The joint orchestration of radio and transport resources can help to address some of these challenges. One example is the possibility of reconfiguring the use of the transport network resources according to the spatial and temporal variations of the wireless traffic patterns. Using the concept of dynamic resource sharing, a limited pool of transport resources can be shared among a large number of radio base stations (RBSs), thus reducing considerably the overall deployment cost of the transport infrastructure. This paper proposes a provisioning strategy for a centralized radio access network with an optical transport whose wavelength resources can be dynamically shared among multiple RBSs. The proposed strategy utilizes a hierarchical software-defined networking control plane where a global orchestrator optimizes the usage of radio and transport resources. The benefits of the proposed strategy are assessed both by simulation and by experiment via an optical data plane emulator developed for this purpose. It is shown that the dynamic resource sharing can save up to 31.4% of transport resources compared to a conventional dimensioning approach, i.e., based on the overprovi-sioning of wavelength resources.

Traffic Density-Based RRH Selection for Power Saving in C-RAN

Abstract: Cloud radio access network (C-RAN) is deemed as a promising architecture to meet the exponentially increasing traffic demand in a mobile network. However, it needs a huge amount of transport capacity between the remote radio heads (RRHs) and the baseband unit pool. Though an optical transport network can be employed to support such a massive capacity, it always leads to enormous power consumption that is comparable with the transmission powers of the RRHs, which can significantly decrease the performance of the C-RAN if not well addressed. In this paper, we investigate the power saving issue in the C-RAN, where we attempt to get a power consumption tradeoff between the optical transport network and the RRHs. An RRH selection problem is formulated to achieve this goal, which is based on the traffic density of the service area. Our optimization task is to select a subset of the RRHs to minimize the total power consumption of the C-RAN while satisfying a series of network constraints, including the power and bandwidth budgets of the RRHs, the traffic demands of users, and the spectral efficiency. We develop an efficient local search algorithm, which includes three types of local improvement operations: “add,” “open,” and “close,” to address the intractable optimization task. Numerical results indicate that our proposal can significantly reduce the power consumption of the C-RAN. Moreover, our proposed algorithm converges stably and quickly, indicating that it is promising for applications.