
Marco HoffmannNokia Bell Labs
Marco Hoffmann
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Introduction
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Publications
Publications (54)
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...
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...
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...
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...
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...
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...
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...
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-...
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-...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
Future highly-reliable cloud and network services demand for survivability architectures covering network and IT infrastructures. We propose corresponding design models and evaluate them.
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...
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...
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...
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...
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...
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...
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...
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.
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...
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...
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...
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...
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...
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...
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...
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...
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.
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.
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...
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...
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.
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.
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...
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...
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...
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...
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
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...