Marco Hoffmann

Marco Hoffmann
Nokia Bell Labs

About

54
Publications
14,972
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2,055
Citations
Introduction

Publications

Publications (54)
Article
Full-text available
The 6th generation of wireless mobile networks is emerging as a paradigm shifting successor to unifying the experience across the physical, digital, and human worlds, pushing boundaries on performance in capacity, throughput, latency, scalability, flexibility, and reliability, while prominently addressing new major factors, including sustainability...
Article
Full-text available
While 5G is being deployed and the economy and society begin to reap the associated benefits, the research and development community starts to focus on the next, 6th Generation (6G) of wireless communications. Although there are papers available in the literature on visions, requirements and technical enablers for 6G from various academic perspecti...
Technical Report
Full-text available
The White Paper covers key areas related to 6G research from a technical, societal, policy and business perspective providing a vision for the future networks and services. In the coming decade, 6G will bring a new era in which billions of things, humans, connected vehicles, robots and drones will generate zettabytes of digital information. 6G will...
Article
Full-text available
The post-pandemic future will offer tremendous opportunity and challenge from transformation of the human experience linking physical, digital and biological worlds: 6G should be based on a new architecture to fully realize the vision to connect the worlds. We explore several novel architecture concepts for the 6G era driven by a decomposition of t...
Article
Full-text available
SDN and NFV gained significant momentum within the last years. Although widely used in research labs and cloud environments, SDN has not yet been deployed in mobile telecommunication networks. In this paper, we focus on use cases driving mobile network evolution towards cost-efficient IT-based solutions using standardized hardware and software-base...
Article
Full-text available
With the rapid growth of user traffic, service innovation, and the persistent necessity to reduce costs, today’s mobile operators are faced with several challenges. In networking, two concepts have emerged aiming at cost reduction, increase of network scalability and deployment flexibility, namely Network Functions Virtualization (NFV) and Software...
Article
Full-text available
Die Digitalisierung der Gesellschaft und Industrie schreitet unaufhörlich voran, und die Bedeutung des Zugangs zu uneingeschränkter mobiler Vernetzung für unser gesellschaftliches und berufliches Leben nimmt somit ebenfalls stetig zu. Mit der Entwicklung der 5G Mobilfunkgeneration, aber auch echtzeitfähiger lokaler Funknetze werden in Zukunft digit...
Article
Hybrid IP networks that use both control paradigms - distributed and centralized - promise the best of two worlds: programmability and agility of SDN, and reliability and fault tolerance of distributed routing protocols like OSPF. The common approaches follow a division of labor concept, where SDN controls prioritized traffic and OSPF assures care-...
Preprint
Hybrid IP networks that use both control paradigms - distributed and centralized - promise the best of two worlds: programmability and agility of SDN, and reliability and fault tolerance of distributed routing protocols like OSPF. The common approaches follow a division of labor concept, where SDN controls prioritized traffic and OSPF assures care-...
Article
Software Defined Networking (SDN) marks a paradigm shift towards an externalized and logically centralized network control plane. A particularly important task in SDN architectures is that of controller placement, i.e., the positioning of a limited number of resources within a network to meet various requirements. These requirements range from late...
Article
The introduction of Software Defined Networking (SDN) and Network Functions Virtualization (NFV) has transformed the way networks will be built in the future. This development also applies to mobile networks and their evolution. How the SDN and NFV concepts will be integrated exactly is still an open research question with multiple approaches and t...
Article
The dependency of businesses and private applications on cloud solutions is increasing day by day. Still, many businesses are reluctant to adopt cloud solutions mainly due to reliability concerns. Service degradation or outages can be caused both due to the cloud domain and the communication network connecting the users to the cloud, which are oper...
Article
The introduction of Network Functions Virtualization (NFV) and Software Defined Networking (SDN) to mobile networks enables operators to control and dimension their network resources with higher granularity and on a more fine-grained time scale. This dynamic operation allows operators to cope with the rapid growth of traffic and user demands, in ad...
Article
Full-text available
Today's businesses and consumer applications are becoming increasingly dependent on cloud solutions, making them vulnerable to service outages that can result in a loss of communication or access to business-critical services and data. Are we really prepared for such failure scenarios? Given that failures can occur on both the network and data cent...
Article
Full-text available
Due to the independent operation of cloud infrastructures and communication networks, global cloud services face limitations in the end-to-end quality of experience (QoE). Network virtualization enables end-to-end QoE by combining the control of network and cloud resources. In a network-virtualization architecture involving different business roles...
Article
Full-text available
Software Defined Networking (SDN) is an emerging network control paradigm focused on logical centralization and programmability. At the same time, distributed routing protocols, most notably OSPF and IS-IS, are still prevalent in IP networks, as they provide shortest path routing, fast topological convergence after network failures, and, perhaps mo...
Conference Paper
The introduction of Network Functions Virtualization (NFV) and Software Defined Networking (SDN) to mobile networks enables operators to control and dimension their network resources with higher granularity and on a more fine-grained time scale. This dynamic operation allows operators to cope with the rapid growth of traffic and user demands, in ad...
Article
Conventionally, network migration models study competition between emerging and incumbent technologies by considering the resulting increase in revenue and associated cost of migration. We propose to advance the science in the existing network migration models by considering additional critical factors, including (1) synergistic relationships acros...
Article
With the rapid growth of user data, service innovation, and the persistent necessity to reduce costs, today's mobile operators are faced with severe challenges. In networking, two new concepts have emerged aiming at cost reduction, increase of network scalability and service flexibility, namely Network Functions Virtualization (NFV) and Software De...
Conference Paper
Given the assumption that network equipment vendors will soon deploy new energy saving mechanisms in their routers, the question we are aiming to answer is this: Where in the network to start the migration to energy efficient routers, and how large is the impact of the migration scheduling on the total energy saving? To this end, the paper studies...
Conference Paper
Future highly-reliable cloud and network services demand for survivability architectures covering network and IT infrastructures. We propose corresponding design models and evaluate them.
Conference Paper
In this paper, we analyze the question of network migration to Software Defined Networking (SDN) from the perspective of Traffic Engineering (TE). For a given network topology and migration planning horizon, we ask the question of which routers in the IP network should migrate to SDN-enabled operation to reduce the need for network capacity upgrade...
Conference Paper
The recent initiative of Network Functions Virtualization (NFV) aims to deliver any data- plane processing or control-plane function in high volume data centers or network elements to decrease operational cost and increase deployment flexibility. In order to dynamically direct traffic flows between respective network elements, Software Defined Netw...
Article
Full-text available
As the Software Defined Networking (SDN) paradigm gains momentum, every network operator faces the obvious dilemma: when and how to migrate from existing IP routers to SDN compliant equipments. A single step complete overhaul of a fully functional network is impractical, while at the same time, the immediate benefits of SDN are obvious. A viable so...
Conference Paper
Network virtualization is regarded as a promising concept solving the Internet ossification problem for the future Internet and as a method to provision well-framed cloud services. Providing resilience continues to be a key issue for future networks due to the high service requirements, growing data volumes, and the dependency of businesses and soc...
Conference Paper
Network virtualization is seen as a possible solution to the ossification problem of the Internet by providing flexible and scalable virtual networks running over heterogeneous physical infrastructure. As for today's networks, it is very crucial to evaluate the virtual networks' adaptability to fulfill the demanding quality requirements of the dive...
Article
Full-text available
Conventionally, network migration models study competition between emerging and incumbent technologies by considering the resulting increase in revenue and associated cost of migration. We propose to advance the science in the existing network migration models by considering additional critical factors, including (i) synergistic relationships acros...
Conference Paper
Full-text available
Currently, accessing global cloud services has its limitations in end-to-end quality of experience (QoE) due to the independent operation of cloud infrastructures and communication networks. The novel virtual network design approaches for resilient cloud services that are presented in this paper can realize end-to-end availability and latency guara...
Conference Paper
We provide optimal virtual network design models with protection against various physical and virtual failures. Our models enable protection against single link, node and sub-network failures with almost the same cost using an intelligent design.
Conference Paper
Full-text available
In the recent past, Network Virtualization (NV) received much attention. Nevertheless, Virtual Networks (VNs) are still not avail-able on the market. The consortium of the COntrol and Management of COexisting Networks (COMCON) project examines the potential in-teractions in vertically and horizontally divided markets and evaluates the applicability...
Article
Full-text available
Ethernet's success in local area networks (LANs) is fueling the efforts to extend its reach to cover metro and long-haul networks. This new Ethernet is refereed to as Carrier Ethernet. Among the various transport infrastructures for realizing Carrier Ethernet, wavelength-division multiplexing (WDM) optical network is a strong candidate for this pur...
Article
Based on the expected future requirements this paper describes a general network architecture enabled by network virtualization. This architecture consists of three major building blocks which we call virtualized physical resources, virtual resource manager and virtual network controller. Such an architecture will facilitate network sharing deploym...
Article
Full-text available
In today's Internet, requirements of services regarding the underlying transport network are very diverse. In the future, this diversity will increase and make it harder to accommodate all services in a single network. A possible approach to keep up with this diversity in future networks is the deployment of isolated , custom tailored networks on t...
Article
Full-text available
Ethernet’s success in local-area networks (LANs) is fueling the efforts to extend its reach to cover metro and long-haul networks. A key enabler for using Ethernet in the carrier’s network is its ability to efficiently support multipoint-to-multipoint (MP2MP) services. MP2MP service is the core underlying structure to enable standard Ethernet servi...
Conference Paper
Full-text available
In the Future Internet, a multitude of networks will coexist and complement each other. These networks allow specialization but require isolation of functionalities in order to provide dependable and predictable networks. This allows different networks to run in parallel but isolated from each other. Additionally, network resource scalability is su...
Article
Upcoming broadband commercial and scientific applications are now demanding high bandwidth pipes across multiple domains with guaranteed Quality of Service (QoS). Recent research initiatives such as the Path Computation Element (PCE) framework are focusing on the development of scalable multi-domain QoS provisioning frameworks, especially within th...
Article
Ethernet is a success story in local area networks. Efforts to extend its boundaries beyond LAN to the carriers' backbone networks are in progress. We study the problem of designing reliable and cost-efficient high-rate (100 Gb/s) carrier-grade Ethernet. Reliability is considered for application at one of two levels: Etherpath protection (where an...
Conference Paper
Full-text available
We address the issues of inter-domain optical service provisioning with carrier-grade Ethernet and propose a multi-layer PCE based control plane architecture to implement adaptive advance reservation, which can significantly improve resource utilization and reduce blocking.
Article
We study cost-efficient and reliable design of multi-bit-rate virtual private network (VPN) in a Mixed-Line-Rte (MLR) WDM optical network for multipoint-to-multipoint carrier Ethernet services.
Conference Paper
There is a growing demand for end-to-end quality of service in present day multi-domain networks. IP/BGP is not equipped to support end-to-end QoS required by new upcoming services, and scalable QoS paradigms are required in lower layers to support future applications. Frequent fluctuations of available inter-domain resources inside a domain hinder...
Conference Paper
Wavelength-division multiplexing (WDM) optical networks are characterized by maturity, high-capacity, agility, flexibility, and cost-efficiency. Today, optical transmission rates are increasing from 10 Gbit/s to 100 Gbit/s which increases the network's flexibility for capacity provisioning. We study the problem of dimensioning optical WDM networks...
Conference Paper
We study the problem of determining the optimal transmission range (TR) for high-rate carrier-grade Ethernet. We show that, since traffic grooming can be combined with signal regeneration, optimal TR value depends on the traffic volume.
Article
We study cost-efficient routing in a MLR WDM network for carrier-grade Ethernet. We also study the benefits of a MLR network compared to a Single-Line Rate (SLR) network.
Article
Full-text available
Ethernet is a success story in local area networks (LAN). Efforts for extending its boundaries beyond LAN to the carriers' backbone networks are in progress. We study the problem of designing reliable and cost-efficient high-rate (100 Gbit/s) carrier-grade Ethernet in a multiline-rate optical network under signal transmission-range constraints. Rel...
Article
Full-text available
The enormous growth of bandwidth needs and the constant revenues of the carriers at the same time require the introduction of packet technologies in transport networks. The extension of Ethernet with carrier-grade features is a promising approach to provide necessary characteristics like scalability, quality of service, and operations, administrati...
Conference Paper
Full-text available
Ethernet is a success story in Local Area Networks (LAN). Efforts for extending its boundaries beyond LAN to the carriers' backbone networks are in progress. We study the problem of designing reliable and cost-efficient high-rate (100 Gbit/s) carrier-grade Ethernet in a multi-line-rate telecom network under signal transmission-range constraints. Re...
Conference Paper
This paper investigates the availability of connections in core networks which use Ethernet directly over the optical DWDM layer. We study transparent, opaque and hybrid connections. We show that the availability of a protected hybrid connection can be accurately estimated through calculating the availability of a protected transparent path or prot...
Article
Full-text available
We study cost-efficient design of reliable Next-Generation Carrier-Grade Ethernet under different linkrates and,signal-transmission-range constraints. Experimental results from,our proposed,algorithms show,significant improvement,on the network cost compared,to other designs. ©2007 Optical Society of America OCIS codes: (060.4250) Networks
Article
Full-text available
In today's Internet, services are very different in their requirements on the underlying transport network. In the future, this diversity will increase and it will be more difficult to accommodate all services in a single network. A possible approach to cope with this diversity within future networks is the introduction of support for running isola...

Network

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