Jose Alberto Galicia Hernandez - Academia.edu (original) (raw)

Papers by Jose Alberto Galicia Hernandez

Transactions on Emerging Telecommunications Technologies, 2014

ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings wit... more ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings with Dual Attachment (DRDAs) architectures is presented in this work. DRDAs are composed of two rings with corresponding nodes connected by two separated links. There are several possible configurations of p-cycles, which may be used in DRDAs for improving link or node protection upon link failure. The values of the parameters Mean Time To Failure and Mean Time To Disconnection are analysed in the paper to show the best choice of p-cycles in DRDAs architectures. Copyright © 2014 John Wiley & Sons, Ltd.

2009 11th International Conference on Transparent Optical Networks, 2009

In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Ne... more In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Networks (FAN) are compared. A Multilayer FAN (MFAN) architecture defines policies to decide which flows are more suitable to be transmitted through the optical layer in case of congestion. In this work, we evaluate how to include the information of such policies in the admission control process. As a result of the analysis, a new admission control strategy is proposed. This solution inherits the advantages from already established admission control proposals while ensuring fast acceptance times of new streaming flows.

NOMS 2008 - 2008 IEEE Network Operations and Management Symposium, 2008

In the development of accurate capacity planning and network resource dimensioning models, networ... more In the development of accurate capacity planning and network resource dimensioning models, network operators must handle representative information about the traffic volumes traversing its network. However, the amount of traffic measurements available over which to perform such analysis, processing and storage is overwhelming. For this reason, the research community has understood the importance of finding an effective mechanism to reduce

2011 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, 2011

Building vehicular networks in roads and highways is a challenging research topic with a large nu... more Building vehicular networks in roads and highways is a challenging research topic with a large number of applications ranging from the prevention of traffic jams and car collisions to efficient route planning. Analyzing the distance between vehicles in roads is a key factor in, e.g., designing vehicular networks protocols or planning a supporting infrastructure to improve connectivity. This work proposes a Gaussian-exponential mixture model to characterize the time distance between vehicles in a highway lane, based on measurements collected at different locations in several highways of the city of Madrid. The model arises from the observed behavior that some vehicles travel very close together, like in a burst mode, showing Gaussian inter-arrival times, while other vehicles are isolated, showing exponentially distributed inter-arrival times. The experiments show that such a Gaussianexponential mixture model accurately characterizes inter-vehicle times as observed from real traces.

2008 International Conference on Optical Network Design and Modeling, 2008

In Optical Burst Switched networks, when a Burst Control Packet arrives at a core node, its sched... more In Optical Burst Switched networks, when a Burst Control Packet arrives at a core node, its scheduling algorithm looks up its internal reservation table for an available gap at which to accomodate the incoming burst. The processing time of the BCP is variable, and depends on the number of available gaps over which to perform the search.

Computer Communications and Networks, 2009

2007 ICTON Mediterranean Winter Conference, 2007

Recent research in Optical Burst Switched networks has proposed solutions to support subwavelengt... more Recent research in Optical Burst Switched networks has proposed solutions to support subwavelength reservation for the periodic transmission of data bursts, which can coexist with conventional asynchronous bursts, bringing the Polymorphous, Agile and Transparent Optical Networks (PATON) [1]. Thus, network operators can distribute IPTV channels to their customers, whereby they can use the spare bandwidth for the transmission of best-effort traffic, making use of the free gaps in between such periodic reservations. This work proposes scheduling algorithms for the transmission of periodic channels using PATON, and studies the blocking probability observed by best-effort traffic, when such scheduling algorithms are used.

Transactions on Emerging Telecommunications Technologies, 2014

This work provides a novel measurement-based analysis of the tweet arrival traffic process at Twi... more This work provides a novel measurement-based analysis of the tweet arrival traffic process at Twitter. The analysis considers more than one million total tweets collected at 48 different times of the day (o'clock and half-past every hour). We observe a 3.5 tweet/ms average rate with a valley of 2.5 tweets/ms at 10 a.m. (GMT+1) and a peak at 3 p.m. (GMT+1) of about 5 tweets/ms. We further model the traffic pattern as a Gaussian process and we validate such an assumption with multiple normality tests. Finally, we overview a number of applications where such a model may show its utility, namely infrastructure dimensioning and upgrading, the detection of outlier events, energy efficiency, etc.

Photonic Network Communications, 2007

In Optical Burst-Switched (OBS) networks, the limitation of optical buffering devices make it imp... more In Optical Burst-Switched (OBS) networks, the limitation of optical buffering devices make it impractical to deploy conventional delay-based differentiation algorithms such as Active Queue Management, Weighted Fair Queuing, etc.

Photonic Network Communications, 2009

In Optical Burst Switched (OBS) networks employing Just Enough Time (JET) signalling, Burst Contr... more In Optical Burst Switched (OBS) networks employing Just Enough Time (JET) signalling, Burst Control Packets (BCPs) request resources at intermediate nodes following a one-way reservation protocol, that is, requested resources are not confirmed back to the source. Hence, data bursts are transmitted without any guarantees, and it sometimes occurs that these are dropped at a certain hop in the source-destination path, hence wasting resources at previous hops. This effect is specially harmful if some connections are abusing of the global shared resources, violating their respective Service Level Agreements, thus causing: (1) global performance degradation; and, (2) unfair service received by other connections. This paper proposes "Random Packet Assembly Admission Control" (RPAAC), an admission control mechanism for OBS networks that moderates the two problems above. The mechanism monitors the network load status, detects which links are heavily loaded and decides which flows among the total traversing them require throughput decrease, on attempts to alleviate congestion and benefit other flows which are not abusing from the network. Such throughput decrease consists of preventive packet dropping during the assembly process at the ingress nodes of the OBS network, thus making no use of the network core. The numerical results show a substantial increase in the throughput experienced by well-behaved flows, and fundamental fairness achievement in the use of optical resources.

Photonic Network Communications, 2012

In Passive Optical Networks (PONs) employing the Interleaved Polling with Adaptive Cycle Time (IP... more In Passive Optical Networks (PONs) employing the Interleaved Polling with Adaptive Cycle Time (IPACT), the literature has focused on providing bandwidth-based service differentiation strategies. This work shows how to provide different levels of delay-based differentiation, and provides a model to characterise the proportional differentiation achieved, which is further validated with extensive simulations. Furthermore, we show that the delay variance of our algorithm is smaller with respect to conventional IPACT, with the subsequent jitter reduction for high-priority traffic; and we further present a mechanism to limit the maximum delay experienced by high-priority traffic.

Photonic Network Communications, 2009

Given the bufferless nature of Optical Burst-Switched networks, data bursts are either transmitte... more Given the bufferless nature of Optical Burst-Switched networks, data bursts are either transmitted or dropped; the latter typically occurs when all the wavelengths of a given output port are occupied. Clearly, the amount of time during which a given output port is blocked and cannot schedule incoming data bursts is a key performance measure of OBS networks.

Journal of Lightwave Technology, 2000

In Polymorphous Optical Burst-Switched (POBS) networks, the Burst Control Packets (BCPs) of conve... more In Polymorphous Optical Burst-Switched (POBS) networks, the Burst Control Packets (BCPs) of conventional Just-Enough-Time based signalling OBS networks are given extended properties which enable them not only to reserve fixed time-slots for asynchronous data bursts, but also to allocate TDM reservations for periodic streams of data, and even a complete wavelength for high-bandwidth demanding services. This allows POBS to provide a flexible, yet transparent, approach for supporting the idiosyncrasies of today's most popular services over the same underlying network architecture. In POBS, the spare gaps in between synchronous TDM reservations can be used for the allocation of best-effort data bursts, leading to a more efficient utilisation of the optical capacity.

Industrial & Engineering Chemistry Research, 2001

ABSTRACT In this work, solution strategies for the optimal design of nonredundant observable line... more ABSTRACT In this work, solution strategies for the optimal design of nonredundant observable linear sensor networks are discussed. The Greedy algorithm allows the problem only to be tackled for a subset of optimization criteria. Particular deterministic techniques or general evolutionary strategies are necessary to solve the problem for more complex objective functions. In this context, a procedure based on the application of genetic algorithms (GAs) and linear algebra is presented. Ad hoc operators are designed for the crossover and mutation operations because the classic genetic operators perform poorly. In contrast to ad hoc deterministic codes, which find the design solution for each specific criteria, this strategy allows the problem to be solved with different objective functions using the same implementation. Furthermore, this code is extended to handle multiobjective problems through a modification of only the selection operator. An industrial example is provided to show the efficiency of the algorithm.

Gastrointestinal Endoscopy, 2010

withdrawal times, as well as, adenoma detection rates among academic and private practice gastroe... more withdrawal times, as well as, adenoma detection rates among academic and private practice gastroenterologists. Aim: To assess for an improvement in withdrawal times and adenoma detection rates following departmental education regarding nationally recommended withdrawal times and expected detection rates.Methods: At a single academic institution, 550 screening colonoscopies were analyzed from October 2006 to March 2007 measuring withdrawal times and adenoma detection rates for average risk patients screened for colorectal cancer. Following the previous study, endoscopists were notified of their comparative results and were educated on the national recommendations for withdrawal during screening colonoscopies and expected adenoma detection. Following the education, data from 413 screening colonoscopies were retrospectively reviewed at the same academic endoscopy unit over a 3 month period from July through September 2009. Data was collected on colonoscopy times to allow calculation of withdrawal times, as well as, polyp detection rates. Results: Eleven academic gastroenterologists were studied. The median patient age was 53. 48% of subjects were male and 52% female. The initial study average overall withdrawal time for 550 colonoscopies was 8.9 minutes. Follow-up overall withdrawal time was 12.6 minutes (PϽ0.001). Initial study withdrawal time for colonoscopies where no polyps detected was 7.0 minutes. Follow-up study withdrawal time where no polyps were detected was 9.7 minutes (PϽ.001). The initial study overall adenoma detection rate was .46 and follow-up adenoma detection rate was .57 (Pϭ.051). The initial study detected adenomas in 22% of patients screened. The follow-up study detected adenomas in 34% of patients screened (PϽ.001).Conclusion: Department education about the national recommendations noting improved adenoma detection with cautious withdrawal times yielded a statistically significant improvement in overall withdrawal time and adenoma detection in percentage of patients screened. There was also a near statistically significant improvement in overall adenoma detection rate.

Computer Networks, 2013

Current trends on traffic growth oversee a steady increase of video streaming services, and the s... more Current trends on traffic growth oversee a steady increase of video streaming services, and the subsequent development of the associated infrastructure to allocate and distribute such contents. One of the operational costs associated to this infrastructure is the power bill. Therefore any mechanism used to decrease it, reducing also the carbon footprint associated to it, is welcome. In this work we investigate the suitability of the recently standardized IEEE 802.3az Energy Efficient Ethernet (EEE) for video traffic generated by video-streaming servers. The conclusion of the analysis is positive about the achievable energy savings, due to the inherent features of traffic patterns of video-streaming servers which help reducing the number of transitions between active and low-power modes in EEE.

Transactions on Emerging Telecommunications Technologies, 2014

ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings wit... more ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings with Dual Attachment (DRDAs) architectures is presented in this work. DRDAs are composed of two rings with corresponding nodes connected by two separated links. There are several possible configurations of p-cycles, which may be used in DRDAs for improving link or node protection upon link failure. The values of the parameters Mean Time To Failure and Mean Time To Disconnection are analysed in the paper to show the best choice of p-cycles in DRDAs architectures. Copyright © 2014 John Wiley & Sons, Ltd.

ACM Transactions on Modeling and Computer Simulation, 2007

The particular statistical properties found in network measurements, namely self-similarity and l... more The particular statistical properties found in network measurements, namely self-similarity and long-range dependence, cannot be ignored in modelling network and Internet traffic. Thus, despite their mathematical tractability, traditional Markov models are not appropriate for this purpose, since their memoryless nature contradicts the burstiness of transmitted packets. However, it is desirable to find a similarly tractable model which is, at the same time, rigorous at capturing the features of network traffic.

2009 11th International Conference on Transparent Optical Networks, 2009

In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Ne... more In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Networks (FAN) are compared. A Multilayer FAN (MFAN) architecture defines policies to decide which flows are more suitable to be transmitted through the optical layer in case of congestion. In this work, we evaluate how to include the information of such policies in the admission control process. As a result of the analysis, a new admission control strategy is proposed. This solution inherits the advantages from already established admission control proposals while ensuring fast acceptance times of new streaming flows.

Transactions on Emerging Telecommunications Technologies, 2014

ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings wit... more ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings with Dual Attachment (DRDAs) architectures is presented in this work. DRDAs are composed of two rings with corresponding nodes connected by two separated links. There are several possible configurations of p-cycles, which may be used in DRDAs for improving link or node protection upon link failure. The values of the parameters Mean Time To Failure and Mean Time To Disconnection are analysed in the paper to show the best choice of p-cycles in DRDAs architectures. Copyright © 2014 John Wiley & Sons, Ltd.

2009 11th International Conference on Transparent Optical Networks, 2009

In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Ne... more In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Networks (FAN) are compared. A Multilayer FAN (MFAN) architecture defines policies to decide which flows are more suitable to be transmitted through the optical layer in case of congestion. In this work, we evaluate how to include the information of such policies in the admission control process. As a result of the analysis, a new admission control strategy is proposed. This solution inherits the advantages from already established admission control proposals while ensuring fast acceptance times of new streaming flows.

NOMS 2008 - 2008 IEEE Network Operations and Management Symposium, 2008

In the development of accurate capacity planning and network resource dimensioning models, networ... more In the development of accurate capacity planning and network resource dimensioning models, network operators must handle representative information about the traffic volumes traversing its network. However, the amount of traffic measurements available over which to perform such analysis, processing and storage is overwhelming. For this reason, the research community has understood the importance of finding an effective mechanism to reduce

2011 IEEE International Symposium on a World of Wireless, Mobile and Multimedia Networks, 2011

Building vehicular networks in roads and highways is a challenging research topic with a large nu... more Building vehicular networks in roads and highways is a challenging research topic with a large number of applications ranging from the prevention of traffic jams and car collisions to efficient route planning. Analyzing the distance between vehicles in roads is a key factor in, e.g., designing vehicular networks protocols or planning a supporting infrastructure to improve connectivity. This work proposes a Gaussian-exponential mixture model to characterize the time distance between vehicles in a highway lane, based on measurements collected at different locations in several highways of the city of Madrid. The model arises from the observed behavior that some vehicles travel very close together, like in a burst mode, showing Gaussian inter-arrival times, while other vehicles are isolated, showing exponentially distributed inter-arrival times. The experiments show that such a Gaussianexponential mixture model accurately characterizes inter-vehicle times as observed from real traces.

2008 International Conference on Optical Network Design and Modeling, 2008

In Optical Burst Switched networks, when a Burst Control Packet arrives at a core node, its sched... more In Optical Burst Switched networks, when a Burst Control Packet arrives at a core node, its scheduling algorithm looks up its internal reservation table for an available gap at which to accomodate the incoming burst. The processing time of the BCP is variable, and depends on the number of available gaps over which to perform the search.

Computer Communications and Networks, 2009

2007 ICTON Mediterranean Winter Conference, 2007

Recent research in Optical Burst Switched networks has proposed solutions to support subwavelengt... more Recent research in Optical Burst Switched networks has proposed solutions to support subwavelength reservation for the periodic transmission of data bursts, which can coexist with conventional asynchronous bursts, bringing the Polymorphous, Agile and Transparent Optical Networks (PATON) [1]. Thus, network operators can distribute IPTV channels to their customers, whereby they can use the spare bandwidth for the transmission of best-effort traffic, making use of the free gaps in between such periodic reservations. This work proposes scheduling algorithms for the transmission of periodic channels using PATON, and studies the blocking probability observed by best-effort traffic, when such scheduling algorithms are used.

Transactions on Emerging Telecommunications Technologies, 2014

This work provides a novel measurement-based analysis of the tweet arrival traffic process at Twi... more This work provides a novel measurement-based analysis of the tweet arrival traffic process at Twitter. The analysis considers more than one million total tweets collected at 48 different times of the day (o'clock and half-past every hour). We observe a 3.5 tweet/ms average rate with a valley of 2.5 tweets/ms at 10 a.m. (GMT+1) and a peak at 3 p.m. (GMT+1) of about 5 tweets/ms. We further model the traffic pattern as a Gaussian process and we validate such an assumption with multiple normality tests. Finally, we overview a number of applications where such a model may show its utility, namely infrastructure dimensioning and upgrading, the detection of outlier events, energy efficiency, etc.

Photonic Network Communications, 2007

In Optical Burst-Switched (OBS) networks, the limitation of optical buffering devices make it imp... more In Optical Burst-Switched (OBS) networks, the limitation of optical buffering devices make it impractical to deploy conventional delay-based differentiation algorithms such as Active Queue Management, Weighted Fair Queuing, etc.

Photonic Network Communications, 2009

In Optical Burst Switched (OBS) networks employing Just Enough Time (JET) signalling, Burst Contr... more In Optical Burst Switched (OBS) networks employing Just Enough Time (JET) signalling, Burst Control Packets (BCPs) request resources at intermediate nodes following a one-way reservation protocol, that is, requested resources are not confirmed back to the source. Hence, data bursts are transmitted without any guarantees, and it sometimes occurs that these are dropped at a certain hop in the source-destination path, hence wasting resources at previous hops. This effect is specially harmful if some connections are abusing of the global shared resources, violating their respective Service Level Agreements, thus causing: (1) global performance degradation; and, (2) unfair service received by other connections. This paper proposes "Random Packet Assembly Admission Control" (RPAAC), an admission control mechanism for OBS networks that moderates the two problems above. The mechanism monitors the network load status, detects which links are heavily loaded and decides which flows among the total traversing them require throughput decrease, on attempts to alleviate congestion and benefit other flows which are not abusing from the network. Such throughput decrease consists of preventive packet dropping during the assembly process at the ingress nodes of the OBS network, thus making no use of the network core. The numerical results show a substantial increase in the throughput experienced by well-behaved flows, and fundamental fairness achievement in the use of optical resources.

Photonic Network Communications, 2012

In Passive Optical Networks (PONs) employing the Interleaved Polling with Adaptive Cycle Time (IP... more In Passive Optical Networks (PONs) employing the Interleaved Polling with Adaptive Cycle Time (IPACT), the literature has focused on providing bandwidth-based service differentiation strategies. This work shows how to provide different levels of delay-based differentiation, and provides a model to characterise the proportional differentiation achieved, which is further validated with extensive simulations. Furthermore, we show that the delay variance of our algorithm is smaller with respect to conventional IPACT, with the subsequent jitter reduction for high-priority traffic; and we further present a mechanism to limit the maximum delay experienced by high-priority traffic.

Photonic Network Communications, 2009

Given the bufferless nature of Optical Burst-Switched networks, data bursts are either transmitte... more Given the bufferless nature of Optical Burst-Switched networks, data bursts are either transmitted or dropped; the latter typically occurs when all the wavelengths of a given output port are occupied. Clearly, the amount of time during which a given output port is blocked and cannot schedule incoming data bursts is a key performance measure of OBS networks.

Journal of Lightwave Technology, 2000

In Polymorphous Optical Burst-Switched (POBS) networks, the Burst Control Packets (BCPs) of conve... more In Polymorphous Optical Burst-Switched (POBS) networks, the Burst Control Packets (BCPs) of conventional Just-Enough-Time based signalling OBS networks are given extended properties which enable them not only to reserve fixed time-slots for asynchronous data bursts, but also to allocate TDM reservations for periodic streams of data, and even a complete wavelength for high-bandwidth demanding services. This allows POBS to provide a flexible, yet transparent, approach for supporting the idiosyncrasies of today's most popular services over the same underlying network architecture. In POBS, the spare gaps in between synchronous TDM reservations can be used for the allocation of best-effort data bursts, leading to a more efficient utilisation of the optical capacity.

Industrial & Engineering Chemistry Research, 2001

ABSTRACT In this work, solution strategies for the optimal design of nonredundant observable line... more ABSTRACT In this work, solution strategies for the optimal design of nonredundant observable linear sensor networks are discussed. The Greedy algorithm allows the problem only to be tackled for a subset of optimization criteria. Particular deterministic techniques or general evolutionary strategies are necessary to solve the problem for more complex objective functions. In this context, a procedure based on the application of genetic algorithms (GAs) and linear algebra is presented. Ad hoc operators are designed for the crossover and mutation operations because the classic genetic operators perform poorly. In contrast to ad hoc deterministic codes, which find the design solution for each specific criteria, this strategy allows the problem to be solved with different objective functions using the same implementation. Furthermore, this code is extended to handle multiobjective problems through a modification of only the selection operator. An industrial example is provided to show the efficiency of the algorithm.

Gastrointestinal Endoscopy, 2010

withdrawal times, as well as, adenoma detection rates among academic and private practice gastroe... more withdrawal times, as well as, adenoma detection rates among academic and private practice gastroenterologists. Aim: To assess for an improvement in withdrawal times and adenoma detection rates following departmental education regarding nationally recommended withdrawal times and expected detection rates.Methods: At a single academic institution, 550 screening colonoscopies were analyzed from October 2006 to March 2007 measuring withdrawal times and adenoma detection rates for average risk patients screened for colorectal cancer. Following the previous study, endoscopists were notified of their comparative results and were educated on the national recommendations for withdrawal during screening colonoscopies and expected adenoma detection. Following the education, data from 413 screening colonoscopies were retrospectively reviewed at the same academic endoscopy unit over a 3 month period from July through September 2009. Data was collected on colonoscopy times to allow calculation of withdrawal times, as well as, polyp detection rates. Results: Eleven academic gastroenterologists were studied. The median patient age was 53. 48% of subjects were male and 52% female. The initial study average overall withdrawal time for 550 colonoscopies was 8.9 minutes. Follow-up overall withdrawal time was 12.6 minutes (PϽ0.001). Initial study withdrawal time for colonoscopies where no polyps detected was 7.0 minutes. Follow-up study withdrawal time where no polyps were detected was 9.7 minutes (PϽ.001). The initial study overall adenoma detection rate was .46 and follow-up adenoma detection rate was .57 (Pϭ.051). The initial study detected adenomas in 22% of patients screened. The follow-up study detected adenomas in 34% of patients screened (PϽ.001).Conclusion: Department education about the national recommendations noting improved adenoma detection with cautious withdrawal times yielded a statistically significant improvement in overall withdrawal time and adenoma detection in percentage of patients screened. There was also a near statistically significant improvement in overall adenoma detection rate.

Computer Networks, 2013

Current trends on traffic growth oversee a steady increase of video streaming services, and the s... more Current trends on traffic growth oversee a steady increase of video streaming services, and the subsequent development of the associated infrastructure to allocate and distribute such contents. One of the operational costs associated to this infrastructure is the power bill. Therefore any mechanism used to decrease it, reducing also the carbon footprint associated to it, is welcome. In this work we investigate the suitability of the recently standardized IEEE 802.3az Energy Efficient Ethernet (EEE) for video traffic generated by video-streaming servers. The conclusion of the analysis is positive about the achievable energy savings, due to the inherent features of traffic patterns of video-streaming servers which help reducing the number of transitions between active and low-power modes in EEE.

Transactions on Emerging Telecommunications Technologies, 2014

ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings wit... more ABSTRACT A resilience analysis of protection cycles (p-cycle) configurations for Double Rings with Dual Attachment (DRDAs) architectures is presented in this work. DRDAs are composed of two rings with corresponding nodes connected by two separated links. There are several possible configurations of p-cycles, which may be used in DRDAs for improving link or node protection upon link failure. The values of the parameters Mean Time To Failure and Mean Time To Disconnection are analysed in the paper to show the best choice of p-cycles in DRDAs architectures. Copyright © 2014 John Wiley & Sons, Ltd.

ACM Transactions on Modeling and Computer Simulation, 2007

The particular statistical properties found in network measurements, namely self-similarity and l... more The particular statistical properties found in network measurements, namely self-similarity and long-range dependence, cannot be ignored in modelling network and Internet traffic. Thus, despite their mathematical tractability, traditional Markov models are not appropriate for this purpose, since their memoryless nature contradicts the burstiness of transmitted packets. However, it is desirable to find a similarly tractable model which is, at the same time, rigorous at capturing the features of network traffic.

2009 11th International Conference on Transparent Optical Networks, 2009

In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Ne... more In this paper, the admission control policies proposed for Cross-Protect routers in Flow-Aware Networks (FAN) are compared. A Multilayer FAN (MFAN) architecture defines policies to decide which flows are more suitable to be transmitted through the optical layer in case of congestion. In this work, we evaluate how to include the information of such policies in the admission control process. As a result of the analysis, a new admission control strategy is proposed. This solution inherits the advantages from already established admission control proposals while ensuring fast acceptance times of new streaming flows.