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Fixed-mobile convergence initially focused on optimizing fixed and mobile telephone infrastructure for voice services. The appearance of VoIP and smartphones, the growing popularity of social networks and video hosting services, the emerging of 5G, Internet of Things, machine-to-machine communication and ever newer over-the-top services motivated manufacturers, network operators and service providers...
In this paper, we propose a method to support seamless mobility for sessions carried by SIPTO connections. Session continuity has been considered an issue to be solved within 3GPP, as none of the solutions proposed for Mobile IP directly apply in the context of LTE. As in some cases, typically when SIPTO relies on using Local Gateways (LGW), it is necessary to change the IP address allocated to a...
This work focuses on spectrum assignment in Elastic Optical Networks. The accurate study about spectrum occupancy in a flexgrid link is carried out. As a result, the probability values of finding different connection sizes in a perfectly occupied spectrum are derived. It has been found that the possible states of a full spectrum window are described by the Fibonacci succession terms. After developing...
This work proposes a novel blind void (idle periods) filling in Long-Reach Ethernet Passive Optical Networks (LR-EPONs) namely Size Controlled Batch Void Filling (SCBVF). We emphasize on reducing grant delays and hence reducing the average packet delay. SCBVF delay reduction is achieved by early flushing data during the idle time periods (voids) between allocated grants. The proposed approach can...
A lot of research, development, and standardization efforts are going on to extend the latest buzz in packet networks called Software-Defined Networking (SDN) to the optical domain. We argue though that a reasonable combination of packet layer SDN with dynamic optical transport (in whatever flavor) is already possible with some architectural adaptations. We therefore propose to combine a recently...
Linear error correction is widely implemented in millions of telecommunication devices to cope with unreliable or noisy communication channels. A common error in linear encoders is when some bits that are originally one in the generator matrix get erased and become zero — usually due to a soft error becoming a hard error or simply a physical impact on the device. The need to deal with this phenomenon...
In this paper, we address the problem of the strict-sense nonblocking operation of an elastic optical switch. Elastic optical switches are used as nodes in elastic optical networks (EONs), where fine granular frequency slots or flexible grids are used in opposite to the traditional optical networks, where fixed grids are used. The switch architecture considered in this paper consists of waveband converting...
This paper addresses the regenerator placement problem (RPP) when designing resilient, impairment aware WDM optical networks. For the RPP, we have proposed two solutions; an optimal solution for small networks (less than 10 nodes) and a near-optimal heuristic solution for practical-sized networks. The optimal solution uses an Integer Linear Program which can be implemented by any solver for mathematical...
The explosion of mobile multimedia and Internet-of-things (IoT) services implies strong requirements for seamless switching among various types of networks. Thus, to offer true ubiquitous Internet connection, a Fixed and Mobile Converged (FMC) network architecture is essential for the future 5G network. Such a convergent network can not only improve the utilization of network resources, but also inspire...
This paper develops and evaluates a new protection solution for pre-configured-cycle (p-cycle) design in Mixed-Line-Rate (MLR) optical networks. Conventional p-cycle approaches require enumerating candidate cycles in advance and screening p-cycles using heuristic algorithms. Our method generates p-cycles directly in one-step using an Integer Linear Programming (ILP) model. Cost-effective transponders...
Shortest Path Bridging (SPB) is a new layer 2 switching technology which is the latest on the IEEE 802.3 Ethernet evolution path and provides improved scalability. It is suitable for large-scale cloud data center networks that require hundreds or thousands of switches (or bridges) to connect up to tens of thousands of servers. In SPB, 16 ECT (equal cost tree) algorithms are introduced to select one...
We newly developed a layer 3 switch prototype that has one 100 Gbps optical packet interface and twelve 10 GbE interfaces. This is a gateway node to the optical packet switched network. While similar nodes made by the authors just have conversion capability from/to Ethernet frames to/from optical packets, this switch provides full layer 3 switching capability among the 13 ports, namely, packets incoming...
Data center network (DCN) placement with the consideration of potential large-scale region failures is critical to ensure its functionality under such catastrophic scenarios. This paper considers the optimal DCN placement for DCN failure risk minimization against such region failures. We first apply a general probabilistic region failure model to determine the failure probability of a node/link, and...
Programmable networking platforms are in the spotlight since the advent of SDN (Software Defined Networking). It is a great challenge to create such a platform — especially with reconfigurable hardware and line-rate capabilities reaching and exceeding 100 Gbit/s. These requirements together put FPGA (Field Programmable Gate Array) technology into the focus of high performance networking. In this paper,...
This paper presents a hardware implementation of Openstate, an extension of OpenFlow that allows performing stateful control functionalities directly inside the switch, without requiring the intervention of an external controller. The paper shows how, with a minimal reworking of the OpenFlow's basic architecture, and reusing the same building blocks, it is possible to greatly extend the intelligence...
This work advances the state-of-art in path scheduling and route selection by considering multiple call classes and allowing users to provide multiple start-time options in their requests for bandwidth in advance-reservation systems. Our system model supports two call classes: User-Specified Start Times (USST) and Earliest-Start Time (EST). The USST class is suitable for applications such as remote...
Service relocation represents a promising strategy to provide flexible and resource efficient resiliency from link failures in the optical cloud environment. However, when a failure affects a node hosting a datacenter (DC), service relocation from the affected DC is not possible. One alternative to protect against DC failures relies on using design strategies that duplicate the IT (i.e., storage and...
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