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001-es BibID:	BIBFORM065550
Első szerző:	Almási Béla (informatikus, matematikus)
Cím:	Investigating the performance of the MPT multipath communication library in IPv4 and IPv6 / Béla Almási, Szabolcs Szilágyi
Dátum:	2016
ISSN:	1805-5443
Megjegyzések:	The currently used mobile devices (laptops, tablets, mobile phones) contain many built-in network cards for communication (e.g. Wi-Fi, 3G, Bluetooth, etc.). A natural request could be combining the resources of the different network connection possibilities in order to increase the throughput of the communication. Unfortunately the standard IP communication technology does not support it: the communication is restricted to one IP address (i.e. to one interface). The Multipath TCP (MPTCP) specification (appeared in January 2013) offers a Transport layer solution of using more than one interface in a TCP communication session. In this paper we investigate a Network layer solution. The MPT multipath communication library opens the multipath communication possibility in the Network layer. Using the MPT library, applications built on the UDP protocol are also able to perform multipath communication. The MPT library was developed by using a full dual-stack technology, which means the MPT based multipath environment can be used both in IPv4 and IPv6. Protocol version change is also possible: an IPv6 based application is able to run in an IPv4 multipath environment, and an IPv4 application can be used in an IPv6 multipath environment. In this paper we give a short overview on the MPT communication library's working mechanism and detailed numerical examples will be shown to present how the MPT library aggregates the paths' throughput in IPv4 and IPv6 environments. The main contribution of the paper is to demonstrate the effective throughput aggregation property of the MPT library in IPv6 and in mixed (i.e. protocol version change) environments.
Tárgyszavak:	Műszaki tudományok Informatikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban IPv6 Multipath communication throughput performance tunnel
Megjelenés:	International Journal of Advances in Telecommunications, Electrotechnics, Signals and Systems. - 5 : 1 (2016), p. 53-60. -
További szerzők:	Szilágyi Szabolcs (1982-) (mérnök-informatikus)
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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001-es BibID:	BIBFORM054037
Első szerző:	Orosz Péter (informatikus)
Cím:	A No-reference Voice Quality Estimation Method for Opus-based VoIP Services / Péter Orosz, Tamás Skopkó, Zoltán Nagy, Tamás Lukovics
Dátum:	2014
ISSN:	1942-2601
Megjegyzések:	By the emergence of real time media applications, correlating users' satisfaction with measured service quality is a constant challenge. Accordingly, this area was under intensive research in the last decade. Finding the correlation among Quality of Experience (QoE) for voice, measured Quality of Service (QoS) parameters in the network, and objective voice performance metrics is a key task. Most of the voice metrics use the reference content to compare the quality of the received stream. In contrast, this paper introduces a mathematical low-complexity, no-reference method that performs real-time estimation of QoE for Opus-based voice services. To determine the estimator function, we performed combined (subjective and objective) assessments to build a reference data set of 3-tuple of MOS, jitter and loss values. Applying polynomial regression, we used the reference data set to search a low-degree two-variable polynomial to hash objective QoS metrics (jitter and loss) to the subjective MOS score of the service quality. In the final phase of our investigation, we were evaluated the performance of the polynomials with a set of four audio clips.
Tárgyszavak:	Műszaki tudományok Informatikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban Opus codec real-time voice QoE estimation QoS-QoE correlation Hálózatok modellezése és analízise
Megjelenés:	International Journal on Advances in Telecommunications. - 7 : 1-2 (2014), p. 12-21. -
További szerzők:	Skopkó Tamás (1978-) (informatikus) Nagy Zoltán (1991-) (informatikus) Lukovics Tamás (1989-) (informatikus)
Pályázati támogatás:	TÁMOP-4.2.2.C-11/1/KONV-2012-0001 TÁMOP Médiaforgalom QoS/QoE online analízise nagysebességű hálózatokban
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat
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