The Experts below are selected from a list of 36138 Experts worldwide ranked by ideXlab platform
Seungjoon Lee - One of the best experts on this subject based on the ideXlab platform.
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3g meets the internet understanding the performance of hierarchical routing in 3g networks
International Teletraffic Congress, 2011Co-Authors: Wei Dong, Seungjoon LeeAbstract:The volume of Internet Traffic over 3G wireless networks is sharply rising. In contrast to many Internet services utilizing replicated resources, such as Content Distribution Networks (CDN), the current 3G standard architecture employs hierarchical routing, where all User Data Traffic goes through a small number of aggregation points using logical tunnels. In this paper, we study the performance implications of the interplay when 3G Users access Internet services. We first identify a number of scenarios in which 3G Users' service performance can be affected under hierarchical routing in comparison to an idealized flat routing. We then quantify this service impact by analyzing trace Data obtained from a large-scale 3G network and a CDN provider. We find that the performance difference between hierarchical routing and flat routing increases when a 3G User accesses highly replicated service, and can further aggravates when the DNS caching is not properly managed under vertical handoff. For example, in our Data analysis, the detour under hierarchical routing can cause a packet to travel extra distance by up to 1627km on the average case, which can lead to around 45.4% increase in round-trip latency. We also perform a measurement study to demonstrate that User mobility and web applications can lead to unexpected performance-impacting interactions, which can degrade the download throughput by up to an order of magnitude (0.9Mbps vs. 10.8Mbps).
Thomas Haustein - One of the best experts on this subject based on the ideXlab platform.
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mmWave Backhaul Testbed Configurability Using Software-Defined Networking
Hindawi-Wiley, 2019Co-Authors: Ricardo Santos, Konstantin Koslowski, Julian Daube, Hakim Ghazzai, Andreas Kassler, Kei Sakaguchi, Thomas HausteinAbstract:Future mobile Data Traffic predictions expect a significant increase in User Data Traffic, requiring new forms of mobile network infrastructures. Fifth generation (5G) communication standards propose the densification of small cell access base stations (BSs) in order to provide multigigabit and low latency connectivity. This densification requires a high capacity backhaul network. Using optical links to connect all the small cells is economically not feasible for large scale radio access networks where multiple BSs are deployed. A wireless backhaul formed by a mesh of millimeter-wave (mmWave) links is an attractive mobile backhaul solution, as flexible wireless (multihop) paths can be formed to interconnect all the access BSs. Moreover, a wireless backhaul allows the dynamic reconfiguration of the backhaul topology to match varying Traffic demands or adaptively power on/off small cells for green backhaul operation. However, conducting and precisely controlling reconfiguration experiments over real mmWave multihop networks is a challenging task. In this paper, we develop a Software-Defined Networking (SDN) based approach to enable such a dynamic backhaul reconfiguration and use real-world mmWave equipment to setup a SDN-enabled mmWave testbed to conduct various reconfiguration experiments. In our approach, the SDN control plane is not only responsible for configuring the forwarding plane but also for the link configuration, antenna alignment, and adaptive mesh node power on/off operations. We implement the SDN-based reconfiguration operations in a testbed with four nodes, each equipped with multiple mmWave interfaces that can be mechanically steered to connect to different neighbors. We evaluate the impact of various reconfiguration operations on existing User Traffic using a set of extensive testbed measurements. Moreover, we measure the impact of the channel assignment on existing Traffic, showing that a setup with an optimal channel assignment between the mesh links can result in a 44% throughput increase, when compared to a suboptimal configuration
Wei Dong - One of the best experts on this subject based on the ideXlab platform.
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3g meets the internet understanding the performance of hierarchical routing in 3g networks
International Teletraffic Congress, 2011Co-Authors: Wei Dong, Seungjoon LeeAbstract:The volume of Internet Traffic over 3G wireless networks is sharply rising. In contrast to many Internet services utilizing replicated resources, such as Content Distribution Networks (CDN), the current 3G standard architecture employs hierarchical routing, where all User Data Traffic goes through a small number of aggregation points using logical tunnels. In this paper, we study the performance implications of the interplay when 3G Users access Internet services. We first identify a number of scenarios in which 3G Users' service performance can be affected under hierarchical routing in comparison to an idealized flat routing. We then quantify this service impact by analyzing trace Data obtained from a large-scale 3G network and a CDN provider. We find that the performance difference between hierarchical routing and flat routing increases when a 3G User accesses highly replicated service, and can further aggravates when the DNS caching is not properly managed under vertical handoff. For example, in our Data analysis, the detour under hierarchical routing can cause a packet to travel extra distance by up to 1627km on the average case, which can lead to around 45.4% increase in round-trip latency. We also perform a measurement study to demonstrate that User mobility and web applications can lead to unexpected performance-impacting interactions, which can degrade the download throughput by up to an order of magnitude (0.9Mbps vs. 10.8Mbps).
Ricardo Santos - One of the best experts on this subject based on the ideXlab platform.
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mmWave Backhaul Testbed Configurability Using Software-Defined Networking
Hindawi-Wiley, 2019Co-Authors: Ricardo Santos, Konstantin Koslowski, Julian Daube, Hakim Ghazzai, Andreas Kassler, Kei Sakaguchi, Thomas HausteinAbstract:Future mobile Data Traffic predictions expect a significant increase in User Data Traffic, requiring new forms of mobile network infrastructures. Fifth generation (5G) communication standards propose the densification of small cell access base stations (BSs) in order to provide multigigabit and low latency connectivity. This densification requires a high capacity backhaul network. Using optical links to connect all the small cells is economically not feasible for large scale radio access networks where multiple BSs are deployed. A wireless backhaul formed by a mesh of millimeter-wave (mmWave) links is an attractive mobile backhaul solution, as flexible wireless (multihop) paths can be formed to interconnect all the access BSs. Moreover, a wireless backhaul allows the dynamic reconfiguration of the backhaul topology to match varying Traffic demands or adaptively power on/off small cells for green backhaul operation. However, conducting and precisely controlling reconfiguration experiments over real mmWave multihop networks is a challenging task. In this paper, we develop a Software-Defined Networking (SDN) based approach to enable such a dynamic backhaul reconfiguration and use real-world mmWave equipment to setup a SDN-enabled mmWave testbed to conduct various reconfiguration experiments. In our approach, the SDN control plane is not only responsible for configuring the forwarding plane but also for the link configuration, antenna alignment, and adaptive mesh node power on/off operations. We implement the SDN-based reconfiguration operations in a testbed with four nodes, each equipped with multiple mmWave interfaces that can be mechanically steered to connect to different neighbors. We evaluate the impact of various reconfiguration operations on existing User Traffic using a set of extensive testbed measurements. Moreover, we measure the impact of the channel assignment on existing Traffic, showing that a setup with an optimal channel assignment between the mesh links can result in a 44% throughput increase, when compared to a suboptimal configuration
Kari Veikko Horneman - One of the best experts on this subject based on the ideXlab platform.
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licensed shared access lsa and three tier spectrum sharing models regulation business and technology perspectives
2017Co-Authors: Marja Matinmikko, Seppo Yrjola, Miia Mustonen, Petri Ahokangas, Kari Veikko HornemanAbstract:Spectrum sharing is an important enabler for future mobile broadband systems to meet the growing end User Data Traffic needs. Considering spectrum sharing from regulation, business and technology perspectives is the key for the successful development of sharing models that can be deployed in practical systems. This chapter studies recent spectrum sharing concepts from regulatory, business and technology perspectives. We present the European Licensed Shared Access (LSA) spectrum sharing concept covering its regulatory, business, and technical aspects with a focus on the LSA case example of sharing between LTE and incumbent program making and special events (PMSE) services in the 2.3-2.4 GHz band. The LSA evolution including more dynamic sharing toward the US three-tier spectrum sharing model for Citizen Broadband Radio Service (CBRS) based on Spectrum Access System (SAS) is depicted in terms of its ecosystem, business benefits, and technical approaches. Future outlook is given to envisage the development of sharing models for the mobile broadband.
