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Publications (10 of 290) Show all publications
Mohideen, A. C., Rajiullah, M., Secchi, R., Fairhurst, G., Brunström, A. & Weinrank, F. (2019). Evaluating the impact of transport mechanisms on web performance for effective web access. Journal of Network and Computer Applications, 137, 25-34
Open this publication in new window or tab >>Evaluating the impact of transport mechanisms on web performance for effective web access
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2019 (English)In: Journal of Network and Computer Applications, ISSN 1084-8045, E-ISSN 1095-8592, Vol. 137, p. 25-34Article in journal (Refereed) Published
Abstract [en]

This paper explores the design trade-offs required for an Internet transport protocol to effectively support web access. It identifies a set of distinct transport mechanisms and explores their use with a focus on multistreaming. The mechanisms are studied using a practical methodology that utilise the range of transport features provided by TCP and SCTP. The results demonstrate the relative benefit of key transport mechanisms and analyse how these impact web access performance. Our conclusions help identify the root causes of performance impairments and suggest appropriate choices guiding the design of a web transport protocol. Performing this analysis at the level of component transport mechanisms enables the results to be utilised in the design of new transport protocols, such as IETF QUIC.

Keywords
Web performance; SCTP; Transport mechanisms
National Category
Communication Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-71847 (URN)10.1016/j.jnca.2019.04.006 (DOI)000470940500003 ()
Available from: 2019-04-16 Created: 2019-04-16 Last updated: 2019-07-02Bibliographically approved
Yedugundla, K., Hurtig, P. & Brunström, A. (2019). Handling Packet Losses in Cloud-Based Application Traffic. In: Proceedings of the 9th International Conference on Cloud Computing and Services Science - Volume 1: CLOSER: . Paper presented at 9th International Conference on Cloud Computing and Services Science, CLOSER 2019 2-4 May, Heraklion, Greece (pp. 111-119). SciTePress
Open this publication in new window or tab >>Handling Packet Losses in Cloud-Based Application Traffic
2019 (English)In: Proceedings of the 9th International Conference on Cloud Computing and Services Science - Volume 1: CLOSER, SciTePress, 2019, p. 111-119Conference paper, Published paper (Refereed)
Abstract [en]

Internet traffic is comprised of data flows from various applications with unique traffic characteristics. For many cloud applications, end-to-end latency is a primary factor affecting the perceived user experience. As packet losses cause delays in the communication they impact user experience, making efficient handling of packet losses an important function of transport layer protocols. Multipath TCP (MPTCP) is a modification to TCP that enables simultaneous use of several paths for a TCP flow. MPTCP is known to improve throughput. However, the performance of MPTCP is not optimal when handling certain loss scenarios. Efficient packet loss recovery is thus important to achieve desirable flow completion times for interactive cloud-based applications. In this paper we evaluate the performance of MPTCP in handling tail losses using traffic traces from various cloud-based applications. Tail losses, losses that occur at the end of a flow or traffic burst, are particularly challenging from a latency perspective as they are difficult to detect and recover in a timely manner. Tail losses in TCP are handled by using a tail loss probe (TLP) mechanism which was adapted to MPTCP from TCP. We investigate the performance of TLP in MPTCP, comparing the standard implementation to a recently proposed, less conservative approach. Our experimental results show that a less conservative implementation of TLP performs significantly better than the standard implementation in handling tail losses, reducing the average burst completion time of cloud based applications when tail loss occurs by up to 50% in certain cases.

Place, publisher, year, edition, pages
SciTePress, 2019
Keywords
Multipath TCP, Cloud Applications, Latency, Loss Recovery, Performance Evaluation, Measurements.
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-70749 (URN)10.5220/0007723801110119 (DOI)2-s2.0-85067484825 (Scopus ID)978-989-758-365-0 (ISBN)
Conference
9th International Conference on Cloud Computing and Services Science, CLOSER 2019 2-4 May, Heraklion, Greece
Available from: 2019-02-20 Created: 2019-02-20 Last updated: 2019-07-10Bibliographically approved
Abbas, M. T., Eklund, J., Grinnemo, K.-J. & Brunström, A. (2019). Impact of Tunable Parameters in NB-IoT Stack onthe Energy Consumption. In: Proceedings of Fifteenth Swedish National Computer Networking Workshop (SNCNW): . Paper presented at 15th Swedish National Computer Networking Workshop (SNCNW 2019). Luleå, June 4-5, 2019..
Open this publication in new window or tab >>Impact of Tunable Parameters in NB-IoT Stack onthe Energy Consumption
2019 (English)In: Proceedings of Fifteenth Swedish National Computer Networking Workshop (SNCNW), 2019Conference paper, Published paper (Refereed)
Abstract [en]

This paper studies the impact of tunable parametersin the NB-IoT stack on the energy consumption of a user equipment(UE), e.g., a wireless sensor. NB-IoT is designed to enablemassive machine-type communications for UE while providing abattery lifetime of up to 10 years. To save battery power, most oftime the UE is in dormant state and unreachable. Still, duringthe CONNECTED and IDLE state, correct tuning of criticalparameters, like Discontinuous reception (DRX), and extendedDiscontinuous reception (eDRX), respectively, are essential to savebattery power. Moreover, the DRX and eDRX actions relate tovarious parameters which are needed to be tuned in order toachieve a required UE battery lifetime. The objective of thispaper is to observe the influence of an appropriate tuning ofthese parameters to reduce the risk of an early battery drainage

Keywords
NB-IoT, energy consumption, DRX, eDRX.
National Category
Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-72440 (URN)
Conference
15th Swedish National Computer Networking Workshop (SNCNW 2019). Luleå, June 4-5, 2019.
Projects
HITS; 4707
Funder
Knowledge Foundation
Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-07-03Bibliographically approved
Ahlgren, B., Grinnemo, K.-J., Arahamsson, H., Brunström, A. & Hurtig, P. (2019). Latency-aware Multipath Scheduling inInformation-centric Networks. In: Proceedings of the Fifteenth Swedish National Computer Networking Workshop (SNCNW), Luleå, Sweden. 4-5 June 2019.: . Paper presented at The Fifteenth Swedish National Computer Networking Workshop (SNCNW), Luleå, Sweden. 4-5 June 2019..
Open this publication in new window or tab >>Latency-aware Multipath Scheduling inInformation-centric Networks
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2019 (English)In: Proceedings of the Fifteenth Swedish National Computer Networking Workshop (SNCNW), Luleå, Sweden. 4-5 June 2019., 2019Conference paper, Published paper (Refereed)
Abstract [en]

We present the latency-aware multipath schedulerZQTRTT that takes advantage of the multipath opportunities ininformation-centric networking. The goal of the scheduler is touse the (single) lowest latency path for transaction-oriented flows,and use multiple paths for bulk data flows. A new estimatorcalled zero queue time ratio is used for scheduling over multiplepaths. The objective is to distribute the flow over the paths sothat the zero queue time ratio is equal on the paths, that is,so that each path is ‘pushed’ equally hard by the flow withoutcreating unwanted queueing. We make an initial evaluation usingsimulation that shows that the scheduler meets our objectives.

National Category
Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-72439 (URN)
Conference
The Fifteenth Swedish National Computer Networking Workshop (SNCNW), Luleå, Sweden. 4-5 June 2019.
Projects
READY, 4545
Funder
Knowledge Foundation
Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-24Bibliographically approved
Hurtig, P., Grinnemo, K.-J., Brunström, A., Ferlin, S., Alay, Ö. & Kuhn, N. (2019). Low-Latency Scheduling in MPTCP. IEEE/ACM Transactions on Networking, 1, 302-315, Article ID 8584135.
Open this publication in new window or tab >>Low-Latency Scheduling in MPTCP
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2019 (English)In: IEEE/ACM Transactions on Networking, ISSN 1063-6692, E-ISSN 1558-2566, Vol. 1, p. 302-315, article id 8584135Article in journal (Refereed) Published
Abstract [en]

The demand for mobile communication is continuously increasing, and mobile devices are now the communication device of choice for many people. To guarantee connectivity and performance, mobile devices are typically equipped with multiple interfaces. To this end, exploiting multiple available interfaces is also a crucial aspect of the upcoming 5G standard for reducing costs, easing network management, and providing a good user experience. Multi-path protocols, such as multi-path TCP (MPTCP), can be used to provide performance optimization through load-balancing and resilience to coverage drops and link failures, however, they do not automatically guarantee better performance. For instance, low-latency communication has been proven hard to achieve when a device has network interfaces with asymmetric capacity and delay (e.g., LTE and WLAN). For multi-path communication, the data scheduler is vital to provide low latency, since it decides over which network interface to send individual data segments. In this paper, we focus on the MPTCP scheduler with the goal of providing a good user experience for latency-sensitive applications when interface quality is asymmetric. After an initial assessment of existing scheduling algorithms, we present two novel scheduling techniques: the block estimation (BLEST) scheduler and the shortest transmission time first (STTF) scheduler. BLEST and STTF are compared with existing schedulers in both emulated and real-world environments and are shown to reduce web object transmission times with up to 51% and provide 45% faster communication for interactive applications, compared with MPTCP's default scheduler.

Place, publisher, year, edition, pages
IEEE, 2019
Keywords
asymmetric paths., low-latency, MPTCP, scheduling, Transport protocols, Mobile telecommunication systems, Scheduling algorithms, Wireless telecommunication systems, asymmetric paths, Interactive applications, Low latency, Low-latency communication, Performance optimizations, Real world environments, 5G mobile communication systems
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-71263 (URN)10.1109/TNET.2018.2884791 (DOI)000458851600022 ()2-s2.0-85058877698 (Scopus ID)
Available from: 2019-02-21 Created: 2019-02-21 Last updated: 2019-03-14Bibliographically approved
Parichehreh, A., Moosavi, R., Ramachandra, P., Alfredsson, S. & Brunström, A. (2019). LTE as a Road Toward 5G: QoS Analysis in Mobility Scenario Using The Monroe Platform. In: : . Paper presented at IEEE Wireless Communications and Networking Conference 15-19 April 2019 // Marrakech, Morocco (pp. 1-7). IEEE
Open this publication in new window or tab >>LTE as a Road Toward 5G: QoS Analysis in Mobility Scenario Using The Monroe Platform
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2019 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Seamless wireless connectivity and low latency com- munication in mobility scenarios are two fundamental require- ments in the fifth generation networks to effectively cover a broader range of use cases such as massive machine type communications and ultra-reliable low-latency communications for new industrial/potential users, as well as enhanced mobile broadband for conventional users.

In this paper, we aim at measuring certain key performance indicators in mobility scenarios, highlighting some practical inefficiencies that require more careful consideration when de- signing and enhancing mobility features of 5G networks. We investigate the round trip time, uplink throughput and the impact of handover interruption time on these metrics. Our results are based on three months experiment campaign in a mix of rural, suburban, and urban environment using the geographically distributed MONROE platform. Based on the observed discrep- ancies between measured and standardized LTE performance, we conclude the paper with a discussion of techniques that may need more attention for mobility scenarios in fifth generation mobile networks.

Place, publisher, year, edition, pages
IEEE, 2019
Keywords
5G Networks, Long Term Evolution, Measure- ment Analysis, Handover interruption, Latency
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-72047 (URN)
Conference
IEEE Wireless Communications and Networking Conference 15-19 April 2019 // Marrakech, Morocco
Projects
DigitalWell Research Fas 1, 5465
Funder
Region Värmland
Available from: 2019-05-15 Created: 2019-05-15 Last updated: 2019-06-26Bibliographically approved
Nguyen, V.-G., Carlsson, A., Grinnemo, K.-J., Cheng, J., Taheri, J. & Brunström, A. (2019). On the Use of 5G for Inter-substation GOOSE Transmission in Smart Grid. In: Proceedings of the Fifteenth Swedish National Computer Workshop (SNCNW), Luleå, Sweden. June 2019: . Paper presented at 15th Swedish National Computer Networking Workshop SNCNW 2019. 4-5 juni, 2019. Luleå, Sweden..
Open this publication in new window or tab >>On the Use of 5G for Inter-substation GOOSE Transmission in Smart Grid
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2019 (English)In: Proceedings of the Fifteenth Swedish National Computer Workshop (SNCNW), Luleå, Sweden. June 2019, 2019Conference paper, Oral presentation only (Refereed)
Abstract [en]

Protection and automation in a smart grid environmentoften have stringent real-time communication requirementsbetween devices within a substation as well as between distantlylocated substations. The Generic Object Oriented SubstationEvent (GOOSE) messaging service has been proposed to achievethis goal as it allows to transfer time-critical information within afew milliseconds. However, the transmission of GOOSE messagesare often limited to a small Local Area Network (LAN).In this paper, we propose the use of the fifth generation ofmobile networks (5G) as a means to transport GOOSE messagesin a large scale smart grid environment. The end-to-end delay ismeasured between GOOSE devices over an 5G network with thefocus on the core network using the Open5GCore platform in alab environment. Although there is a lack of a real radio accessnetwork, the experimental results confirm that the delay withinthe rest of the 5G network is small enough for it to be feasiblefor inter-substation GOOSE transmissions.

National Category
Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-72435 (URN)
Conference
15th Swedish National Computer Networking Workshop SNCNW 2019. 4-5 juni, 2019. Luleå, Sweden.
Projects
HITS, 4707
Funder
Knowledge Foundation
Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-07-17Bibliographically approved
Haile, H. K., Hurtig, P., Grinnemo, K.-J. & Brunström, A. (2019). Rate Change Detection in Stationary Cellular Nodes. In: Proceedings of the Fifteenth Swedish National Computer NetworkingWorkshop (SNCNW), Luleå, Sweden. 4-5 June: . Paper presented at The Fifteenth Swedish National Computer NetworkingWorkshop (SNCNW), Luleå, Sweden. 4-5 June.
Open this publication in new window or tab >>Rate Change Detection in Stationary Cellular Nodes
2019 (English)In: Proceedings of the Fifteenth Swedish National Computer NetworkingWorkshop (SNCNW), Luleå, Sweden. 4-5 June, 2019Conference paper, Published paper (Refereed)
Abstract [en]

An increasing number of cellular congestion controlalgorithms (CCAs) are relying on measurements of the deliveryrate observed at the receiver. Accordingly, early detection ofchanges in the receiver’s rate would improve the performanceof such algorithms. Rate measurements over short time intervalscould allow fast detection of change in the rate observed bythe upper layers of a cellular receiver. However, upper layerrate measurements for cellular receivers over a short time scaleproduce unreliable results due to the effect of underlying lowerlayer mechanisms. In this paper, we introduce a rate estimationapproach that reduces the variability observed in short timescale receiver rate measurements and allows faster rate changedetection.

Keywords
Cellular, rate, estimation, Kalman
National Category
Telecommunications
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-72438 (URN)
Conference
The Fifteenth Swedish National Computer NetworkingWorkshop (SNCNW), Luleå, Sweden. 4-5 June
Projects
HITS, 4707
Funder
Knowledge Foundation
Available from: 2019-06-12 Created: 2019-06-12 Last updated: 2019-06-24Bibliographically approved
Mancuso, V., Peón Quirós, M., Midoglu, C., Moulay, M., Comite, V., Lutu, A., . . . Hirsch, T. (2019). Results from running an experiment as a service platform for mobile broadband networks in Europe. Computer Communications, 33, 89-101
Open this publication in new window or tab >>Results from running an experiment as a service platform for mobile broadband networks in Europe
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2019 (English)In: Computer Communications, ISSN 0140-3664, E-ISSN 1873-703X, Vol. 33, p. 89-101Article in journal (Refereed) Published
Abstract [en]

In this article we present a selection from a vast range of experiments run with MONROE, our open experiment as a service (EaaS) platform for measurements and experimentation in Mobile Broadband Networks. We show that the platform can be used to benchmark network performance in a repeatable and controlled manner thanks to the collection of a rich set of geotagged metadata and the execution of discretionary user experiments. Indeed, with the sheer amount of data collected from 12 commercial mobile operators across Europe, MONROE offers an unprecedented opportunity to monitor, analyze and ultimately improve the status of current and future mobile broadband networks. Besides, we show how flexibly the platform allows combining metadata and experimental data series during the experiments or by means of post-processing, and show results produced by our own experiments as well as comment on results obtained by external research groups and developers that have been granted access to our platform.

Place, publisher, year, edition, pages
Elsevier, 2019
Keywords
Mobile broadband, EaaS, Measurements, Network experimentation, Large testbed, Metadata, Performance analysis, Repeatability and reproducibility
National Category
Computer Systems
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-69491 (URN)10.1016/j.comcom.2018.09.004 (DOI)000453619200010 ()
Available from: 2018-10-05 Created: 2018-10-05 Last updated: 2019-05-10Bibliographically approved
Bajpai, V., Brunström, A., Feldmann, A., Kellerer, W., Pras, A., Schulzrinne, H., . . . Wehrle, K. (2019). The Dagstuhl Beginners Guide to Reproducibility for Experimental Networking Research. Computer communication review, 49(1), 24-30
Open this publication in new window or tab >>The Dagstuhl Beginners Guide to Reproducibility for Experimental Networking Research
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2019 (English)In: Computer communication review, ISSN 0146-4833, E-ISSN 1943-5819, Vol. 49, no 1, p. 24-30Article in journal (Other academic) Published
Abstract [en]

Reproducibility is one of the key characteristics of good science, but hard to achieve for experimental disciplines like Internet measurements and networked systems. This guide provides advice to researchers, particularly those new to the field, on designing experiments so that their work is more likely to be reproducible and to serve as a foundation for follow-on work by others.

Place, publisher, year, edition, pages
New York: Association for Computing Machinery (ACM), 2019
Keywords
Experimental networking research, Internet measurements, Reproducibility, Guidance
National Category
Computer Sciences
Research subject
Computer Science
Identifiers
urn:nbn:se:kau:diva-71721 (URN)10.1145/3314212.3314217 (DOI)000460375100005 ()
Available from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-10Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0001-7311-9334

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