Bart Lannoo - Academia.edu (original) (raw)
Papers by Bart Lannoo
In general, optical packet switches contain optical buffers for different purposes: synchronisati... more In general, optical packet switches contain optical buffers for different purposes: synchronisation, delaying to allow electronic header processing, or contention resolution. In this paper we have studied the impact of packet switching without the delay compensation for electronic header processing, commonly referred to as optical burst switching (OBS-JET), on the design and performance of the network nodes. We demonstrate that removing these optical buffers (fibre delay lines) has a significant impact on node design, both at the edge and the core.
This paper is motivated by the fact that municipal Wi-Fi is not an unambiguously successful conce... more This paper is motivated by the fact that municipal Wi-Fi is not an unambiguously successful concept and research to the determinants of a successful case is desirable. Municipal Wi-Fi is the idea to let a cloud based on Wi-Fi technology span the municipality. Our research figures as a prestudy. The author believes that for the definition of what is a successful case the principal motivations of the leading actors should be taken into account. We therefore search for a classification of municipal Wi-Fi cases based on their value network configuration and search for the relation with leading motivations, topology and pricing model. Based on a sample of 19 cases we find four types of cases: the integrator model, the public service model, the wholesale model and the community model. For each of these types one prototype case is described from the Benelux. We observe that community models have a more user centric approach, focussing on offering their users universal access and lower access fees, public service models are initiated by the local municipality and focus on the indirect effects incurred from the network and the integrator and wholesale models are centred around commercial parties aiming to make financial profit.
Traditional optical WDM networks set up end-to-end optical connections by reserving a wavelength.... more Traditional optical WDM networks set up end-to-end optical connections by reserving a wavelength. Unfortunately, this coarse granularity leads to inefficient use of network resources. An attempt to alleviate these problems is Optical Burst Switching (OBS), where the packet header is sent a time T offset ahead of the payload. The payload is then switched transparently, based on the reservation made by the earlier received header. As we will show in our study, different reservation strategies are possible, having a significant impact on the achievable throughput. We developed several alternatives, and evaluated them through simulations.
For most European operators, there is more value in upgrading their existing infrastructure than ... more For most European operators, there is more value in upgrading their existing infrastructure than installing a new FTTH network. One approach to improve the FTTH business case could consist of using a holistic approach, where different aspects are optimized together. First the operator needs to know which areas in a region to rollout first, which areas to postpone or skip. The operator will have to select the best set of customers to connect in order to maximize its business case. Next, the operator should look for approaches in reducing the costs of an FTTH network. The cost for installing the fibres in the network is dominating and the largest reduction here can be achieved by finding synergies with other infrastructure owners. Finally the operational expenditures are also an obstacle for many operators. They have a good understanding of operations for their current infrastructure, while a new fibre based infrastructure will clearly bring uncertainty here. In this paper, we show how tackling the business case on those three frontsstrategic geo-marketing, synergetic installation and detailed operational modellingsimultaneously greatly improves the viability of the business case of FTTH, could lead to an earlier FTTH deployment and higher coverage.
Ever-increasing bandwidth demands and recent mobility trends are two main challenges for the acce... more Ever-increasing bandwidth demands and recent mobility trends are two main challenges for the access network during the next years. On the one hand, an optical fibre based access network (Fibre to the Home or FTTH) offers of all available technologies by far the highest speed and can support a variety of services at the same time: video-on-demand, two-way videoconferencing, gaming,
To enhance mobility in the access network, Mobile WiMAX may offer an appropriate alternative for ... more To enhance mobility in the access network, Mobile WiMAX may offer an appropriate alternative for the current DSL and HFC networks. A key question that needs to be answered is whether the rollout of a WiMAX network is economic feasible. This paper elaborates an extensive business model for the introduction of Mobile WiMAX which is then applied for a rollout in Belgium. A static NPV analysis is performed and several scenarios are compared with each other. As the introduction of such a new technology involves a lot of uncertainties, it is of great importance to determine the most influencing parameters by executing a thorough sensitivity analysis. Such an analysis will also give a good indication of the chance to have a positive business case. Finally, with the aid of real options thinking, it becomes possible to value the capability to anticipate on changing market circumstances.
Network Architectures, Management, and Applications VIII, 2010
A global reference model covering next generation active and passive networks has been developed ... more A global reference model covering next generation active and passive networks has been developed for techno-economic evaluations, and an extensive techno-economic analysis with a focus on CAPEX has been performed for 10G TDM PON and 1G AONboth capable of delivering 1Gbit/s to end-users. Two major cases have been considered: urban and rural at green field deployment. The results show that AON is less expensive than PON solution in urban case while in rural case 10G TDM PON is more competitive.
In general, optical packet switches contain optical buffers for different purposes: synchronisati... more In general, optical packet switches contain optical buffers for different purposes: synchronisation, delaying to allow electronic header processing, or contention resolution. In this paper we have studied the impact of packet switching without the delay compensation for electronic header processing, commonly referred to as optical burst switching (OBS-JET), on the design and performance of the network nodes. We demonstrate that removing these optical buffers (fibre delay lines) has a significant impact on node design, both at the edge and the core.
This paper is motivated by the fact that municipal Wi-Fi is not an unambiguously successful conce... more This paper is motivated by the fact that municipal Wi-Fi is not an unambiguously successful concept and research to the determinants of a successful case is desirable. Municipal Wi-Fi is the idea to let a cloud based on Wi-Fi technology span the municipality. Our research figures as a prestudy. The author believes that for the definition of what is a successful case the principal motivations of the leading actors should be taken into account. We therefore search for a classification of municipal Wi-Fi cases based on their value network configuration and search for the relation with leading motivations, topology and pricing model. Based on a sample of 19 cases we find four types of cases: the integrator model, the public service model, the wholesale model and the community model. For each of these types one prototype case is described from the Benelux. We observe that community models have a more user centric approach, focussing on offering their users universal access and lower access fees, public service models are initiated by the local municipality and focus on the indirect effects incurred from the network and the integrator and wholesale models are centred around commercial parties aiming to make financial profit.
Traditional optical WDM networks set up end-to-end optical connections by reserving a wavelength.... more Traditional optical WDM networks set up end-to-end optical connections by reserving a wavelength. Unfortunately, this coarse granularity leads to inefficient use of network resources. An attempt to alleviate these problems is Optical Burst Switching (OBS), where the packet header is sent a time T offset ahead of the payload. The payload is then switched transparently, based on the reservation made by the earlier received header. As we will show in our study, different reservation strategies are possible, having a significant impact on the achievable throughput. We developed several alternatives, and evaluated them through simulations.
For most European operators, there is more value in upgrading their existing infrastructure than ... more For most European operators, there is more value in upgrading their existing infrastructure than installing a new FTTH network. One approach to improve the FTTH business case could consist of using a holistic approach, where different aspects are optimized together. First the operator needs to know which areas in a region to rollout first, which areas to postpone or skip. The operator will have to select the best set of customers to connect in order to maximize its business case. Next, the operator should look for approaches in reducing the costs of an FTTH network. The cost for installing the fibres in the network is dominating and the largest reduction here can be achieved by finding synergies with other infrastructure owners. Finally the operational expenditures are also an obstacle for many operators. They have a good understanding of operations for their current infrastructure, while a new fibre based infrastructure will clearly bring uncertainty here. In this paper, we show how tackling the business case on those three frontsstrategic geo-marketing, synergetic installation and detailed operational modellingsimultaneously greatly improves the viability of the business case of FTTH, could lead to an earlier FTTH deployment and higher coverage.
Ever-increasing bandwidth demands and recent mobility trends are two main challenges for the acce... more Ever-increasing bandwidth demands and recent mobility trends are two main challenges for the access network during the next years. On the one hand, an optical fibre based access network (Fibre to the Home or FTTH) offers of all available technologies by far the highest speed and can support a variety of services at the same time: video-on-demand, two-way videoconferencing, gaming,
To enhance mobility in the access network, Mobile WiMAX may offer an appropriate alternative for ... more To enhance mobility in the access network, Mobile WiMAX may offer an appropriate alternative for the current DSL and HFC networks. A key question that needs to be answered is whether the rollout of a WiMAX network is economic feasible. This paper elaborates an extensive business model for the introduction of Mobile WiMAX which is then applied for a rollout in Belgium. A static NPV analysis is performed and several scenarios are compared with each other. As the introduction of such a new technology involves a lot of uncertainties, it is of great importance to determine the most influencing parameters by executing a thorough sensitivity analysis. Such an analysis will also give a good indication of the chance to have a positive business case. Finally, with the aid of real options thinking, it becomes possible to value the capability to anticipate on changing market circumstances.
Network Architectures, Management, and Applications VIII, 2010
A global reference model covering next generation active and passive networks has been developed ... more A global reference model covering next generation active and passive networks has been developed for techno-economic evaluations, and an extensive techno-economic analysis with a focus on CAPEX has been performed for 10G TDM PON and 1G AONboth capable of delivering 1Gbit/s to end-users. Two major cases have been considered: urban and rural at green field deployment. The results show that AON is less expensive than PON solution in urban case while in rural case 10G TDM PON is more competitive.