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Publications (10 of 34) Show all publications
Ahlgren, B., Grinnemo, K.-J., Abrahamsson, H., Brunstrom, A. & Hurtig, P. (2019). Latency-aware Multipath Scheduling in Information-centric Networks. In: Proceedings of the 15th Swedish National Computer Networking Workshop (SNCNW): . Paper presented at 15th Swedish National Computer Networking Workshop (SNCNW).
Open this publication in new window or tab >>Latency-aware Multipath Scheduling in Information-centric Networks
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2019 (English)In: Proceedings of the 15th Swedish National Computer Networking Workshop (SNCNW), 2019Conference paper, Published paper (Other academic)
Abstract [en]

We present the latency-aware multipath scheduler ZQTRTT that takes advantage of the multipath opportunities in information-centric networking. The goal of the scheduler is to use the (single) lowest latency path for transaction-oriented flows, and use multiple paths for bulk data flows. A new estimator called zero queue time ratio is used for scheduling over multiple paths. The objective is to distribute the flow over the paths so that the zero queue time ratio is equal on the paths, that is, so that each path is ‘pushed’ equally hard by the flow without creating unwanted queueing. We make an initial evaluation using simulation that shows that the scheduler meets our objectives.

National Category
Communication Systems
Identifiers
urn:nbn:se:ri:diva-39240 (URN)
Conference
15th Swedish National Computer Networking Workshop (SNCNW)
Projects
READY
Funder
Knowledge Foundation, 20130086ICT - The Next Generation
Available from: 2019-06-28 Created: 2019-06-28 Last updated: 2019-07-02Bibliographically approved
Abrahamsson, H., Ben Abdesslem, F., Ahlgren, B., Brunstrom, A., Marsh, I. & Björkman, M. (2018). Connected Vehicles in Cellular Networks: Multi-access versus Single-access Performance. In: : . Paper presented at 2nd Workshop on Mobile Network Measurement (MNM’18). , Article ID 8506559.
Open this publication in new window or tab >>Connected Vehicles in Cellular Networks: Multi-access versus Single-access Performance
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2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Connected vehicles can make roads traffic safer andmore efficient, but require the mobile networks to handle timecriticalapplications. Using the MONROE mobile broadbandmeasurement testbed we conduct a multi-access measurementstudy on buses. The objective is to understand what networkperformance connected vehicles can expect in today’s mobilenetworks, in terms of transaction times and availability. The goalis also to understand to what extent access to several operatorsin parallel can improve communication performance.In our measurement experiments we repeatedly transfer warningmessages from moving buses to a stationary server. Wetriplicate the messages and always perform three transactionsin parallel over three different cellular operators. This creates adataset with which we can compare the operators in an objectiveway and with which we can study the potential for multi-access.In this paper we use the triple-access dataset to evaluate singleaccessselection strategies, where one operator is chosen for eachtransaction. We show that if we have access to three operatorsand for each transaction choose the operator with best accesstechnology and best signal quality then we can significantlyimprove availability and transaction times compared to theindividual operators. The median transaction time improves with6% compared to the best single operator and with 61% comparedto the worst single operator. The 90-percentile transaction timeimproves with 23% compared to the best single operator andwith 65% compared to the worst single operator.

National Category
Communication Systems
Identifiers
urn:nbn:se:ri:diva-34311 (URN)10.23919/TMA.2018.8506559 (DOI)2-s2.0-85057241219 (Scopus ID)
Conference
2nd Workshop on Mobile Network Measurement (MNM’18)
Available from: 2018-07-30 Created: 2018-07-30 Last updated: 2019-01-07Bibliographically approved
Ahlgren, B., Hurtig, P., Abrahamsson, H., Grinnemo, K.-J. & Brunstrom, A. (2018). ICN congestion control for wireless links. In: : . Paper presented at 2018 IEEE Wireless Communications and Networking Conference (WCNC) (pp. 1-6).
Open this publication in new window or tab >>ICN congestion control for wireless links
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2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Information-centric networking (ICN) with its design around named-based forwarding and in-network caching holds great promises to become a key architecture for the future Internet. Many proposed ICN hop-by-hop congestion control schemes assume a fixed and known link capacity, which rarely - if ever - holds true for wireless links. Firstly, we demonstrate that although these congestion control schemes are able to fairly well utilise the available wireless link capacity, they greatly fail to keep the delay low. In fact, they essentially offer the same delay as in the case with no hop-by-hop, only end-to-end, congestion control. Secondly, we show that by complementing these schemes with an easy-to-implement, packet-train capacity estimator, we reduce the delay to a level significantly lower than what is obtained with only end-to-end congestion control, while still being able to keep the link utilisation at a high level.

Keywords
Internet, radio links, telecommunication congestion control, ICN congestion control, wireless links, information-centric networking, in-network caching, packet-train capacity estimator, end-to-end congestion control, named based forwarding, hop-by-hop congestion control, Wireless communication, Delays, Throughput, Bandwidth, Protocols, Estimation
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-34334 (URN)10.1109/WCNC.2018.8377396 (DOI)2-s2.0-85049217847 (Scopus ID)
Conference
2018 IEEE Wireless Communications and Networking Conference (WCNC)
Available from: 2018-08-07 Created: 2018-08-07 Last updated: 2019-01-09Bibliographically approved
Ben Abdesslem, F., Abrahamsson, H. & Ahlgren, B. (2018). Measuring Mobile Network Multi-Access for Time-Critical C-ITS Applications. In: TMA 2018 - Proceedings of the 2nd Network Traffic Measurement and Analysis Conference: . Paper presented at 2nd Network Traffic Measurement and Analysis Conference, TMA 2018, 26 June 2018 through 29 June 2018.
Open this publication in new window or tab >>Measuring Mobile Network Multi-Access for Time-Critical C-ITS Applications
2018 (English)In: TMA 2018 - Proceedings of the 2nd Network Traffic Measurement and Analysis Conference, 2018Conference paper, Published paper (Refereed)
Abstract [en]

Cooperative Intelligent Transport Systems (C-ITS) make road traffic safer and more efficient, but require the mobile networks to handle time-critical applications. While some applications may need new dedicated communications technologies such as IEEE 802.11p or 5G, other applications can use current cellular networks. This study evaluates the performance that connected vehicles can expect from existing networks, and estimates the potential gain of multi-access by simultaneously transmitting over several operators. We upload time-critical warning messages from buses in Sweden, and characterise transaction times and network availability. We conduct the experiments with different protocols: UDP, TCP, and HTTPS. Our results show that when using UDP, the median transaction time for sending a typical warning message is 135 ms. We also show that multi-access can bring this value down to 73 ms. For time-critical applications requiring transaction times under 200 ms, multi-access can increase availability of the network from to 57.4% to 92.0%.

Keywords
Intelligent systems, Intelligent vehicle highway systems, Mobile telecommunication systems, Traffic control, Wireless networks, Cellular network, Communications technology, Connected vehicles, Different protocols, Intelligent transport systems, ITS applications, Network availability, Time-critical applications, 5G mobile communication systems
National Category
Natural Sciences
Identifiers
urn:nbn:se:ri:diva-36597 (URN)10.23919/TMA.2018.8506551 (DOI)2-s2.0-85057249133 (Scopus ID)9783903176096 (ISBN)
Conference
2nd Network Traffic Measurement and Analysis Conference, TMA 2018, 26 June 2018 through 29 June 2018
Available from: 2018-12-17 Created: 2018-12-17 Last updated: 2018-12-17Bibliographically approved
Ben Abdesslem, F., Abrahamsson, H. & Ahlgren, B. (2018). Measuring Mobile Network Multi-Access for Time-Critical C-ITS Applications. In: : . Paper presented at Network Traffic Measurement and Analysis Conference (TMA 2018). , Article ID 8506551.
Open this publication in new window or tab >>Measuring Mobile Network Multi-Access for Time-Critical C-ITS Applications
2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Cooperative Intelligent Transport Systems (C-ITS)make road traffic safer and more efficient, but require the mobilenetworks to handle time-critical applications. While some applicationsmay need new dedicated communications technologiessuch as IEEE 802.11p or 5G, other applications can use currentcellular networks. This study evaluates the performance that connectedvehicles can expect from existing networks, and estimatesthe potential gain of multi-access by simultaneously transmittingover several operators. We upload time-critical warning messagesfrom buses in Sweden, and characterise transaction times andnetwork availability. We conduct the experiments with differentprotocols: UDP, TCP, and HTTPS. Our results show that whenusing UDP, the median transaction time for sending a typicalwarning message is 135 ms. We also show that multi-access canbring this value down to 73 ms. For time-critical applicationsrequiring transaction times under 200 ms, multi-access canincrease availability of the network from to 57.4% to 92.0%.

National Category
Communication Systems
Identifiers
urn:nbn:se:ri:diva-34314 (URN)10.23919/TMA.2018.8506551 (DOI)
Conference
Network Traffic Measurement and Analysis Conference (TMA 2018)
Available from: 2018-07-30 Created: 2018-07-30 Last updated: 2019-01-09Bibliographically approved
Abrahamsson, H., Ben Abdesslem, F., Ahlgren, B., Björkman, M., Brunstrom, A. & Marsh, I. (2018). Selecting Operator in 3G/4G Networks for Time-Critical C-ITS Applications. In: : . Paper presented at 14th Swedish National Computer Networking Workshop (SNCNW 2018).
Open this publication in new window or tab >>Selecting Operator in 3G/4G Networks for Time-Critical C-ITS Applications
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2018 (English)Conference paper, Published paper (Refereed)
National Category
Communication Systems
Identifiers
urn:nbn:se:ri:diva-34312 (URN)
Conference
14th Swedish National Computer Networking Workshop (SNCNW 2018)
Available from: 2018-07-30 Created: 2018-07-30 Last updated: 2019-01-22Bibliographically approved
Ahlgren, B., Hurtig, P., Abrahamsson, H., Grinnemo, K.-J. & Brunstrom, A. (2017). Are MIRCC and Rate-based Congestion Control in ICN READY for Variable Link Capacity?. In: : . Paper presented at 13th Swedish National Computer Networking Workshop (SNCNW), May 29-30, Halmstad, Sweden.
Open this publication in new window or tab >>Are MIRCC and Rate-based Congestion Control in ICN READY for Variable Link Capacity?
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2017 (English)Conference paper (Refereed)
Abstract [en]

Information-centric networking~(ICN) has been introduced as a potential future networking architecture. ICN promises an architecture that makes information independent from location, application, storage, and transportation. Still, it is not without challenges. Notably, there are several outstanding issues regarding congestion control: Since ICN is more or less oblivious to the location of information, it opens up for a single application flow to have several sources, something which blurs the notion of transport flows, and makes it very difficult to employ traditional end-to-end congestion control schemes in these networks. Instead, ICN networks often make use of hop-by-hop congestion control schemes. However, these schemes are also tainted with problems, e.g., several of the proposed ICN congestion controls assume fixed link capacities that are known beforehand. Since this seldom is the case, this paper evaluates the consequences in terms of latency, throughput, and link usage, variable link capacities have on a hop-by-hop congestion control scheme, such as the one employed by the Multipath-aware ICN Rate-based Congestion Control~(MIRCC). The evaluation was carried out in the OMNeT++ simulator, and demonstrates how seemingly small variations in link capacity significantly deteriorate both latency and throughput, and often result in inefficient network link usage.

National Category
Computer Sciences
Identifiers
urn:nbn:se:ri:diva-32959 (URN)
Conference
13th Swedish National Computer Networking Workshop (SNCNW), May 29-30, Halmstad, Sweden
Available from: 2018-01-02 Created: 2018-01-02 Last updated: 2018-07-06Bibliographically approved
Abrahamsson, H., Ahlgren, B., Lindvall, P., Nieminen, J. & Tholin, P. (2017). Traffic Characteristics on 1Gbit/s Access Aggregation Links. In: : . Paper presented at IEEE International Conference on Communications (ICC), 21-25 May 2017, Paris, France. , Article ID 7996770.
Open this publication in new window or tab >>Traffic Characteristics on 1Gbit/s Access Aggregation Links
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2017 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Large network operators have thousands or tens of thousands of access aggregation links that they need to manage and dimension properly. Measuring and understanding the traffic characteristics on these type of links are therefore essential. What do the traffic intensity characteristics look like on different timescales from days down to milliseconds? How do the characteristics differ if we compare links with the same capacity but with different type of clients and access technologies? How do the traffic characteristics differ from that on core network links? These are the type of questions we set out to investigate in this paper. We present the results of packet level measurements on three different 1Gbit/s aggregation links in an operational IP network. We see large differences in traffic characteristics between the three links. We observe highly skewed link load probability densities on timescales relevant for buffering (i.e. 10-milliseconds). We demonstrate the existence of large traffic spikes on short timescales (10-100ms) and show their impact on link delay. We also found that these traffic bursts often are caused by only one or a few IP flows.

National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-32376 (URN)10.1109/ICC.2017.7996770 (DOI)2-s2.0-85028321696 (Scopus ID)
Conference
IEEE International Conference on Communications (ICC), 21-25 May 2017, Paris, France
Note

Funder: The Knowledge Foundation (KKS)

Available from: 2017-10-26 Created: 2017-10-26 Last updated: 2019-01-10Bibliographically approved
Abrahamsson, H., Ahlgren, B. & Tholin, P. (2015). Delay and Traffic Intensity Monitoring in an Operational IP Network (6ed.). In: 11th Swedish National Computer Networking Workshop (SNCNW 2015): . Paper presented at 11th Swedish National Computer Networking Workshop (SNCNW 2015), May 28-29, 2015, Karlstad, Sweden. Karlstad, Sweden
Open this publication in new window or tab >>Delay and Traffic Intensity Monitoring in an Operational IP Network
2015 (English)In: 11th Swedish National Computer Networking Workshop (SNCNW 2015), Karlstad, Sweden, 2015, 6Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Karlstad, Sweden: , 2015 Edition: 6
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-24456 (URN)
Conference
11th Swedish National Computer Networking Workshop (SNCNW 2015), May 28-29, 2015, Karlstad, Sweden
Available from: 2016-10-31 Created: 2016-10-31 Last updated: 2019-07-10Bibliographically approved
Abrahamsson, H. & Björkman, M. (2013). Caching for IPTV distribution with time-shift (7ed.). In: : . Paper presented at International conference on Computing, Networking and Communications (ICNC).
Open this publication in new window or tab >>Caching for IPTV distribution with time-shift
2013 (English)Conference paper, Published paper (Refereed)
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:ri:diva-24103 (URN)
Conference
International conference on Computing, Networking and Communications (ICNC)
Available from: 2016-10-31 Created: 2016-10-31 Last updated: 2018-07-04Bibliographically approved
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8102-5773

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