The Experts below are selected from a list of 12525 Experts worldwide ranked by ideXlab platform
Saewoong Bahk - One of the best experts on this subject based on the ideXlab platform.
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assuring Drop Probability for delay insensitive traffic in a differentiated service network
Consumer Communications and Networking Conference, 2005Co-Authors: Changhee Joo, Jaesung Hong, Saewoong BahkAbstract:Loss differentiation is recommended as a service differentiation provided by an assured forwarding (AF) per-fop behavior (PHB) in differentiated service (DiffServ) architecture. An active queue management (AQM) technique is addressed as a suitable alternative to realize the service differentiation because the AF PHB should attempt to minimize long-term congestion while permitting short-term congestion in order to accommodate traffic bursts. In order to realize the AF PHB using an AQM scheme, it is desirable that the AQM scheme has DVO properties of sheltering and load tolerance in order to protect low Drop precedence traffic and to prevent starvation of high Drop precedence traffic. In this paper, we introduce another desirable property of assured Drop Probability. We modify an existing AQM algorithm for the property so that it assures a target Drop Probability in a properly provisioned network. Other properties of sheltering and load tolerance still hold for the modified AQM scheme. We evaluate it with other comparable schemes, i.e., WRED and RIO through simulation.
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Drop Probability assurance for delay insensitive applications
한국통신학회 학술대회 및 강연회, 2004Co-Authors: Changhee Joo, Jaesung Hong, Saewoong BahkAbstract:Loss differentiation is recommended as a service differentiation provided by an Assured Forwarding (AF) Per-Hop Behavior (PHB) in Differentiated Service (DiffServ) architecture. An Active Queue Management (AQM) technique is addressed as a suitable alternative to realize the service differentiation because the AF PHB should attempt to minimize longterm congestion while permitting short-term congestion in order to accommodate traffic bursts. In this paper, we introduce a desirable property of assured Drop Probability. We modify an existing AQM algorithm for the property so that it assures a target Drop Probability in a properly provisioned network. We evaluate it with other comparable schemes through simulation.
Konstantin E. Samouylov - One of the best experts on this subject based on the ideXlab platform.
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joint use of guard capacity and multiconnectivity for improved session continuity in millimeter wave 5g nr systems
IEEE Transactions on Vehicular Technology, 2021Co-Authors: Vyacheslav Begishev, Dmitri Moltchanov, Andrey Samuylov, Sergey Andreev, Yevgeni Koucheryavy, Eduard Sopin, Roman Kovalchukov, Konstantin E. SamouylovAbstract:The intermittent nature of millimeter wave (mmWave) links caused by human-body blockage is an intrinsic property of the 5G New Radio (NR) technology that may cause Drops of sessions already accepted for service. To improve the session continuity, multiconnectivity and guard capacity mechanisms have been proposed recently. Multiconnectivity enables dynamic handover between multiple pre-established spatially-diverse links, while guard capacity reserves a fraction of radio resources for the already accepted sessions by ensuring that they will have sufficient provisions in case of link blockage. In this study, we combine the tools of queuing theory and stochastic geometry to develop a mathematical framework for capturing the joint operation of these two schemes as well as the features of mmWave radio propagation. The metrics are related to user- and system-centric performance including the system resource utilization and the new and ongoing session Drop probabilities. Our results show that multiconnectivity benefits all of the considered parameters. However, the range of performance boost remains limited by the deployment density and the maximum supported degree of multiconnectivity. In its turn, guard capacity allows to further decrease the ongoing session Drop Probability at the expense of the new session Drop Probability and the system resource utilization. When implemented jointly with multiconnectivity, guard capacity does not produce noticeable negative effects on the system resource utilization as compared to its standalone use. Hence, one may prefer a joint implementation of these mechanisms for preserving the session continuity of users without compromising the resource utilization.
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improved session continuity in 5g nr with joint use of multi connectivity and guard bandwidth
Global Communications Conference, 2018Co-Authors: Roman Kovalchukov, Dmitri Moltchanov, Andrey Samuylov, Sergey Andreev, Yevgeni Koucheryavy, Vyacheslav Begishev, Konstantin E. SamouylovAbstract:The intermittent millimeter-wave radio links as a result of human-body blockage are an inherent feature of the 5G New Radio (NR) technology by 3GPP. To improve session continuity in these emerging systems, two mechanisms have recently been proposed, namely, multi-connectivity and guard bandwidth. The former allows to establish multiple spatially-diverse connections and switch between them dynamically, while the latter reserves a fraction of system bandwidth for sessions changing their state from non-blocked to blocked, which ensures that the ongoing sessions have priority over the new ones. In this paper, we assess the joint performance of these two schemes for the user- and system-centric metrics of interest. Our numerical results reveal that the multi-connectivity operation alone may not suffice to increase the ongoing session Drop Probability considerably. On the other hand, the use of guard bandwidth significantly improves session continuity by somewhat compromising new session Drop Probability and system resource utilization. Surprisingly, the 5G NR system implementing both these techniques inherits their drawbacks. However, complementing it with an initial AP selection procedure effectively alleviates these limitations by maximizing the system resource utilization, while still providing sufficient flexibility to enable the desired trade-off between new and ongoing session Drop probabilities.
Changhee Joo - One of the best experts on this subject based on the ideXlab platform.
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assuring Drop Probability for delay insensitive traffic in a differentiated service network
Consumer Communications and Networking Conference, 2005Co-Authors: Changhee Joo, Jaesung Hong, Saewoong BahkAbstract:Loss differentiation is recommended as a service differentiation provided by an assured forwarding (AF) per-fop behavior (PHB) in differentiated service (DiffServ) architecture. An active queue management (AQM) technique is addressed as a suitable alternative to realize the service differentiation because the AF PHB should attempt to minimize long-term congestion while permitting short-term congestion in order to accommodate traffic bursts. In order to realize the AF PHB using an AQM scheme, it is desirable that the AQM scheme has DVO properties of sheltering and load tolerance in order to protect low Drop precedence traffic and to prevent starvation of high Drop precedence traffic. In this paper, we introduce another desirable property of assured Drop Probability. We modify an existing AQM algorithm for the property so that it assures a target Drop Probability in a properly provisioned network. Other properties of sheltering and load tolerance still hold for the modified AQM scheme. We evaluate it with other comparable schemes, i.e., WRED and RIO through simulation.
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Drop Probability assurance for delay insensitive applications
한국통신학회 학술대회 및 강연회, 2004Co-Authors: Changhee Joo, Jaesung Hong, Saewoong BahkAbstract:Loss differentiation is recommended as a service differentiation provided by an Assured Forwarding (AF) Per-Hop Behavior (PHB) in Differentiated Service (DiffServ) architecture. An Active Queue Management (AQM) technique is addressed as a suitable alternative to realize the service differentiation because the AF PHB should attempt to minimize longterm congestion while permitting short-term congestion in order to accommodate traffic bursts. In this paper, we introduce a desirable property of assured Drop Probability. We modify an existing AQM algorithm for the property so that it assures a target Drop Probability in a properly provisioned network. We evaluate it with other comparable schemes through simulation.
Xingang Wang - One of the best experts on this subject based on the ideXlab platform.
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discrete time performance analysis of a congestion control mechanism based on red under multi class bursty and correlated traffic
Journal of Systems and Software, 2007Co-Authors: Lin Guan, Irfanullah Awan, Mike E Woodward, Xingang WangAbstract:Internet traffic congestion control using queue thresholds is a well known and effective mechanism. This motivates the stochastic analysis of a discrete-time queueing systems for the performance evaluation of the active queue management (AQM) based congestion control mechanism called Random Early Detection (RED) with bursty and correlated traffic using a two-state Markov-Modulated Bernoulli arrival process (MMBP-2) as the traffic source. A two-dimensional discrete-time Markov chain is introduced to model the RED mechanism for two traffic classes where each dimension corresponds to a traffic class with its own parameters. This mechanism takes into account the reduction of incoming traffic arrival rate due to packets Dropped probabilistically with the Drop Probability increasing linearly with system contents. The stochastic analysis of the queue considered could be of interest for the performance evaluation of the RED mechanism for the multi-class traffic with short range dependent (SRD) traffic characteristics. The performance metrics including mean system occupancy, mean packet delay, packet loss Probability and system throughput are computed from the analytical model for a Dropping policy which is a function of the thresholds and maximum Drop Probability. Typical numerical results are included to illustrate the credibility of the proposed mechanism in the context of external bursty and correlated traffic. These results clearly demonstrate how different threshold settings can provide different trade-offs between loss Probability and delay to suit different service requirements. The effects on various performance measures of changes in the input parameters and of burstiness and correlations exhibited by the arrival process are also presented. The model would be applicable to high-speed networks which use slotted protocols.
Vyacheslav Begishev - One of the best experts on this subject based on the ideXlab platform.
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joint use of guard capacity and multiconnectivity for improved session continuity in millimeter wave 5g nr systems
IEEE Transactions on Vehicular Technology, 2021Co-Authors: Vyacheslav Begishev, Dmitri Moltchanov, Andrey Samuylov, Sergey Andreev, Yevgeni Koucheryavy, Eduard Sopin, Roman Kovalchukov, Konstantin E. SamouylovAbstract:The intermittent nature of millimeter wave (mmWave) links caused by human-body blockage is an intrinsic property of the 5G New Radio (NR) technology that may cause Drops of sessions already accepted for service. To improve the session continuity, multiconnectivity and guard capacity mechanisms have been proposed recently. Multiconnectivity enables dynamic handover between multiple pre-established spatially-diverse links, while guard capacity reserves a fraction of radio resources for the already accepted sessions by ensuring that they will have sufficient provisions in case of link blockage. In this study, we combine the tools of queuing theory and stochastic geometry to develop a mathematical framework for capturing the joint operation of these two schemes as well as the features of mmWave radio propagation. The metrics are related to user- and system-centric performance including the system resource utilization and the new and ongoing session Drop probabilities. Our results show that multiconnectivity benefits all of the considered parameters. However, the range of performance boost remains limited by the deployment density and the maximum supported degree of multiconnectivity. In its turn, guard capacity allows to further decrease the ongoing session Drop Probability at the expense of the new session Drop Probability and the system resource utilization. When implemented jointly with multiconnectivity, guard capacity does not produce noticeable negative effects on the system resource utilization as compared to its standalone use. Hence, one may prefer a joint implementation of these mechanisms for preserving the session continuity of users without compromising the resource utilization.
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improved session continuity in 5g nr with joint use of multi connectivity and guard bandwidth
Global Communications Conference, 2018Co-Authors: Roman Kovalchukov, Dmitri Moltchanov, Andrey Samuylov, Sergey Andreev, Yevgeni Koucheryavy, Vyacheslav Begishev, Konstantin E. SamouylovAbstract:The intermittent millimeter-wave radio links as a result of human-body blockage are an inherent feature of the 5G New Radio (NR) technology by 3GPP. To improve session continuity in these emerging systems, two mechanisms have recently been proposed, namely, multi-connectivity and guard bandwidth. The former allows to establish multiple spatially-diverse connections and switch between them dynamically, while the latter reserves a fraction of system bandwidth for sessions changing their state from non-blocked to blocked, which ensures that the ongoing sessions have priority over the new ones. In this paper, we assess the joint performance of these two schemes for the user- and system-centric metrics of interest. Our numerical results reveal that the multi-connectivity operation alone may not suffice to increase the ongoing session Drop Probability considerably. On the other hand, the use of guard bandwidth significantly improves session continuity by somewhat compromising new session Drop Probability and system resource utilization. Surprisingly, the 5G NR system implementing both these techniques inherits their drawbacks. However, complementing it with an initial AP selection procedure effectively alleviates these limitations by maximizing the system resource utilization, while still providing sufficient flexibility to enable the desired trade-off between new and ongoing session Drop probabilities.
