Rastin Pries

Rastin Pries
Nokia Networks

Dr.

About

95
Publications
21,010
Reads
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1,311
Citations
Citations since 2017
15 Research Items
564 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Additional affiliations
May 2004 - September 2012
University of Wuerzburg
Position
  • Research Assistant

Publications

Publications (95)
Article
Realizing Service Function Chaining with a micro-service-based architecture results in an increased number of computationally cheap Virtual Network Functions (VNFs). Pinning cheap VNFs to dedicated CPU cores can waste resources since not every VNF fully utilizes its core. Thus, cheap VNFs should share CPU cores to improve resource utilization. Howe...
Conference Paper
Full-text available
The adoption of the cloud-native paradigm in mobile core networks has introduced increased traffic in the control-plane stemming from the inter-Network Function (NF) communication. In this paper, we evaluate a different functional (de)composition for the 5G Core NFs with the goal of achieving high performance and efficient orchestration while reduc...
Article
The introduction of the Service-Based Architecture (SBA) for the 5G Core Networks has drastically changed the way these networks are designed and operated. Aiming for higher flexibility and agility, the adoption of SBA is the first step towards cloud-native deployments of 5G Core. However, the high degree of functional decomposition in SBA has impl...
Conference Paper
Full-text available
In our digitized society, emerging applications require highly performant and flexible networks that can adapt to satisfy varying connectivity needs. P4 as a domain-specific programming language for data plane pipelines introduces the required flexibility through easy-to-use programmability. However, the performance of P4-capable devices is still a...
Conference Paper
Full-text available
The SDN control plane provides the data plane with packet forwarding rules and thus defines its behavior. Understanding the performance of the controller is critical to assess the overall performance of the network. Although OpenFlow-based controllers have been well investigated in this regard, controller performance studies based on P4Runtime, whi...
Conference Paper
Full-text available
The recent trend to deploy programmable packet processors in cloud environments enhances the packet processing capability without losing the flexibility to adapt the functions at runtime. However, managing network functions, in particular deciding where to instantiate a certain function, is a non-trivial task with many decisive factors. In this pap...
Preprint
Full-text available
We study how erasure coding can improve service reliability in Data Center Networks (DCN). To this end, we find that coding can be best deployed in systems, where i) traffic is split into multiple parallel sub-flows, ii) each sub-flow is encoded; iii) SFC along with their corresponding Virtual Network Functions (VNF) concatenated are replicated int...
Article
Full-text available
SDN and NFV gained significant momentum within the last years. Although widely used in research labs and cloud environments, SDN has not yet been deployed in mobile telecommunication networks. In this paper, we focus on use cases driving mobile network evolution towards cost-efficient IT-based solutions using standardized hardware and software-base...
Article
The energy consumption of data centers is accounted for 15% of the total expenditures of a data center while data centers have a non-negligible share of the total energy consumption of the society. This chapter summarizes the proposals dealing with energy consumption and its reduction possibilities. It reviews the energy consumption of data centers...
Article
YouTube is the most important online platform for streaming video clips. The popularity and the continuously increasing number of users pose new challenges for Internet service providers. In particular, in access networks where the transmission resources are limited and the providers are interested in reducing their operational expenditure, it is w...
Conference Paper
Software defined networking (SDN) promises a way to more flexible networks that can adapt to changing demands. At the same time these networks should also benefit from simpler management mechanisms. This is achieved by moving the network control out of the forwarding devices to purpose-tailored software-applications on top of a "networking operatin...
Article
Infrastructure as a service (laaS) is one of the prevalent business models in cloud computing and has generated much customer interest over the past few years. An IaaS provider offers the tem-porary deployment and maintenance of a custom virtual host and network infrastructure to its customers on which arbitrary applications can be run and/or hoste...
Conference Paper
The increasing usage of wireless networks creates new challenges for wireless access providers. On the one hand, providers want to satisfy the user demands but on the other hand, they try to reduce the operational costs by decreasing the energy consumption. In this paper, we evaluate the trade-off between energy efficiency and quality of experience...
Conference Paper
Full-text available
Energy efficiency is becoming increasingly important in today's networking infrastructure, especially in data center networks. Recent surveys have shown that the energy utilized by computing and networking components in a data center considerably contributes to its operation costs. Therefore performance and energy issues are important for the desig...
Conference Paper
Full-text available
More and more services are provided by large data centers with a potentially very large number of physical or virtual hosts. As the number of hosted services and service consumers increases, also the number of hosts inside a data center raises to cope with the increasing end-user demand. Current data center networks are usually based on Ethernet an...
Conference Paper
Since its introduction OpenFlow has been used as an enabler for network experiments in a variety of fields. Although OpenFlow was initially only used in the research domain, the concept is now finding its way into data centers due to the relatively cheap hardware and high flexibility. In this paper, we take a look at the scalability and usability o...
Conference Paper
The ever-changing behavior of HTTP web pages requires an adjustment of the web models used for simulation and benchmarking. In this paper, we present the statistical data of the one million most visited web sites. Using this data, we examine the changes in size and number of objects by comparing our findings with well-known web traffic models. The...
Conference Paper
The fast changing application types and their behavior require consecutive measurements of access networks. In this paper, we present the results of a 14-day measurement in an access network connecting 600 users with the Internet. Our application classification reveals a trend back to HTTP traffic, underlines the immense usage of flash videos, and...
Conference Paper
The high energy costs for running a data center led to a rethinking towards an energy-efficient operation of a data center. Designed for supporting the expected peak traffic load, the goal of the data center provider such as Amazon or Google is now to dynamically adapt the number of offered resources according to the current traffic load. In this p...
Conference Paper
Full-text available
The high power consumption of data centers confronts the providers with major challenges. However, not only the servers and the cooling consume a huge amount of energy, but also the data center network architecture makes an important contribution. In this paper, we introduce different data center architectures and compare them regarding their power...
Conference Paper
Full-text available
Nowadays, global data centers are growing rapidly to satisfy the tremendous traffic demand driven by the exponential development and popularity of the Internet. Consequently, data centers consume a huge amount of energy and emit a lot of greenhouse gases that turns to be a big concern for data center owners and managers as well as for policymakers....
Conference Paper
Full-text available
We recently witness new services that can afford some delay until data transmission starts, but then benefit from a very large available bandwidth. A popular example is the migration of virtual machines between different sites of a geographically dispersed service provider. In this paper, we propose a subscription model for time-scheduled data tran...
Conference Paper
Full-text available
Internet access networks in general and wireless mesh access networks in particular, are the bottleneck of today’s communication networks and consequently most strongly responsible for determining the user satisfaction. The limited bandwidth and the fact that access network are most often used as mere bit pipes are however unfavorable for the users...
Conference Paper
Full-text available
The need for a more sophisticated radio resource management (RRM) for future wireless networks arises from the growing importance of wireless technologies in the future Internet. Wireless communication will firstly enable the Internet
Conference Paper
Full-text available
The evolution and growing dissemination of the wireless Internet as well as the considerable usage heterogeneity introduced by new fields of applications, raise the need for intelligent resource management in future wireless networks.
Conference Paper
Quality measurements are required to support VoIP traffic in the Internet. The widely used average Mean Opinion Score is, however, not sufficient for this task. In this paper, we provide a detailed analysis of the Skype SILK codec and compare it with the iLBC and GSM codec. The results show that the SILK codec is superior to the other codecs in sce...
Article
Traffic characterization is an important means for Internet Service Providers (ISPs) to adapt and to optimize their networks to the requirements of the customers. Most network measurements are performed in the backbone of these ISPs, showing both, residential and business Internet traffic. However, the traffic characteristics of business and home u...
Conference Paper
Full-text available
The problem how to determine the capacity of and achieve fairness in mesh networks is one of the key topics in practical and theoretical research on mesh networks. Max-min fairness is one way to define fairness and several algorithms how to compute max-min fair rate allocations are already published. In this paper we make two major contributions to...
Conference Paper
In this paper, we introduce a monitoring tool which measures application-specific parameters. These parameters are used to predict the QoE and to perform resource management based on QoE thresholds. We demonstrate the tool for YouTube traffic in an IEEE 802.11 mesh network. Thereby, the QoE is based on the player video buffer size and the resource...
Article
Future broadband wireless networks should be able to support not only best effort traffic but also real-time traffic with strict Quality of Service (QoS) constraints. In addition, their available resources are scare and limit the number of users. To facilitate QoS guarantees and increase the maximum number of concurrent users, wireless networks req...
Conference Paper
IEEE 802.11s is an emerging IEEE 802.11 amendment, aiming at standardizing wireless mesh networking. As congestion is a major problem in wireless mesh networks, IEEE 802.11s addresses this problem by introducing the intra-mesh congestion control. In order to explore the potential of this mechanism, we describe two different IEEE 802.11s compliant c...
Article
Full-text available
The integration of different wireless transmission technologies provides several opportunities to perform load control and to optimize the Quality of Experience (QoE) of the end user. However, several problems occur when integrating these technologies. Each technology has its strengths and weaknesses in certain areas and several different approache...
Article
Full-text available
Next generation fixed wireless networks are most likely organized in a mesh structure. The performance of these mesh networks is mainly influenced by the routing scheme and the channel assignment. In this paper, we focus on the routing and channel assignment in large-scale Wireless Mesh Networks to achieve a max-min fair throughput allocation. As m...
Conference Paper
The complex multi-hop structure of WMNs requires a careful network planning. In this paper, we investigate the usability of Genetic Algorithms (GAs) for such a planning approach. The simplicity of GAs allow us to examine a large number of network configurations in order to optimize the network throughput and to fairly distribute the resources. This...
Conference Paper
Full-text available
Out of the large number of multimedia content sharing platforms YouTube is the most popular one. This is reflected by the large number of studies which focus on analyzing YouTube characteristics. Techniques for quantifying the instantaneous YouTube QoE and predicting an imminent QoE degradation have in contrast never been proposed. The latter task...
Conference Paper
The IEEE 802.11 standard supports a variety of modulation and coding schemes (MCSs). In 802.11-based wireless mesh networks (WMNs) it is hence possible to adapt the link rate to the channel conditions. In particular, smaller link rates may be accepted for an increased spatial reuse. In an earlier study, we showed that this effect is suitable for in...
Conference Paper
The complex multi-hop structure of WMNs requires a careful network planning. In this paper, we investigate the usability of Genetic Algorithms (GAs) for such a planning approach. The simplicity of GAs allow us to examine a large number of network configurations in order to optimize the network throughput and to fairly distribute the resources. This...
Conference Paper
Full-text available
Wireless mesh networks (WMNs) support a variety of modulation and coding schemes (MCSs) and hence enable adaptive modulation and coding. On the one hand, adaptive modulation and coding significantly increases the overall system capacity, as it allows to maximize the throughput on each link in dependence of the channel conditions. On the other hand,...
Conference Paper
Full-text available
Wireless Mesh networks are multi-hop networks mostly based on IEEE 802.11 technology and are considered as a viable alternative for providing broadband wireless Internet access. As a consequence, they require support for Quality of Service or advanced mechanisms for selecting Internet gateways. One important required information is the one-way dela...
Conference Paper
Full-text available
This paper shows that the relative collision probability for packets in wireless LAN 802.11 networks decreases with increasing load offered by the respective station. This denotes a clearly unfair channel access which is important to be aware of, e.g., when collision probabilities are measured and used for reactive control of contention windows. We...
Conference Paper
Internet traffic measurements and traffic characterization are essential for managing and optimizing network infrastructures. The increasing number of wireless Internet users and the changing application demands require consecutive traffic measurements. Therefore, we have performed measurements of home users at a broadband wireless access service p...
Article
Full-text available
From its inception, the Internet was not intended as the worldwide universal communication platform. It has developed over almost four decades to its current state. As a result of this unplanned evolution, we currently witness scalability problems, increased complexity, missing modularity as well as missing flexibility for emerging services. In thi...
Conference Paper
Wireless Mesh Networks (WMNs) are a promising technology for providing broadband wireless access to the end user. They offer a higher degree of flexibility compared to traditional networks but on the expense of a more complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper, we address this challenge using genetic al...
Conference Paper
Full-text available
The increasing broadband wireless Internet usage and the limited wireless resources require a careful network management and optimization of the wireless Internet Service Providers (ISPs). Unfortunately, those providers often just have statistics about the overall usage and limited knowledge about the detailed application distribution as well as th...
Conference Paper
Full-text available
Wireless LAN strongly prioritizes high priority traffic over low priority best effort traffic. This causes reduced access to the medium for low priority traffic and under some conditions even leads to starvation. To compensate the throughput reduction of low priority traffic, we propose frame bursting in this paper. That means low priority traffic...
Conference Paper
Wireless Mesh Networks (WMNs) are gaining an increasingly important role in next generation last mile access. They offer more flexibility compared to traditional networks but on the expense of a complex structure. Thus, planning and optimization of WMNs is a challenge. In this paper we focus on routing and channel assignment in WMNs for throughput...
Conference Paper
The IEEE 802.16 standard specifies two contention-based mechanisms for the OFDMA physical layer to transmit bandwidth requests from subscriber station to base station: the standard mechanism is based on Slotted Aloha with a truncated binary exponential backoff; the alternative one is based on CDMA. This paper describes the CDMA-based contention mec...
Conference Paper
In urban areas, users have become more and more accustomed to the availability of broadband access. However, in rural and suburban areas, it is often too expensive for network providers to serve every user with traditional wired broadband access such as DSL or cable modem. In such areas, WiMAX (worldwide interoperability for microwave access) netwo...
Conference Paper
Full-text available
WLAN, based on the IEEE 802.11 standard has been extensively studied since its release. In addition to infrastructure access to WLAN, mesh networks currently attract a lot of attention. This comes from the envisioned advantages of wireless mesh networks, such as cheap installation costs, extended coverage, robustness, easy maintenance, and self-con...
Conference Paper
The Wireless LAN Medium Access Control (MAC) protocol is responsible for an efficient sharing of the limited communication bandwidth. With the demand for Quality of Service (QoS), which is supported by different traffic classes in 802.11e, this task becomes even more complex.\ In this paper, we present a Dynamic Contention Window Adaptation (DCWA)...
Conference Paper
Full-text available
Today, wireless network devices are equipped with multiple access technologies like UMTS andWireless LAN. The handover between the technologies has been widely studied in literature. Several of these research papers build their handover mechanisms on top of existing protocols like Mobile IP. These protocols operate on the network layer and recogniz...
Conference Paper
In UMTS networks, the transmit power for the HSDPA can be a large fraction of the total transmit power of a NodeB. We investigate the impact of three HSDPA transmit power allocation schemes on the performance of a UMTS system with dedicated channel users and HSDPA users. The continuous HSDPA power allocation scheme avoids large steps of the transmi...
Conference Paper
WiMAX (Worldwide Interoperability for Microwave Access) is a wireless access technology that aims to provide last mile wireless broadband access for fixed and mobile users as an alternative to the wired DSL and cable access. It is specified in the IEEE 802.16 standard. The standard defines several possible bandwidth request methods that can be impl...
Conference Paper
The WiMAX technology based on the IEEE802.16 standard is currently the most prospective candidate for broadband wireless access networks. One of the key issues is the design of the MAC layer, in particular the multiple access scheme. The IEEE 802.16 standard specifies different scheduling services with individual mechanisms for accessing the channe...
Conference Paper
Wireless Local Area Networks (WLANs) based on the IEEE 802.11 standard have become more and more popular in the last few years. In such networks, a handover has to be performed when moving from one cell to another. When considering small-scale scenarios like an office building, these handovers can be performed on the ISO/OSI layer two solely. Howev...
Article
Wireless LAN, based on the IEEE 802.11 standards, has been extensively studied since its release. The topic of several of these research papers was the discrepancy of delays and buffer overflow probabilities experienced by the Access Point on one hand and the stations on the other hand. This is widely referred to as the unfair channel access phenom...
Conference Paper
The Global System for Mobile Communications (GSM) is the most popular standard for mobile phones in the world with about 1.57 billion customers. The short message service (SMS) in GSM allows amongst others the transmission of short text messages to mobile phones. In case of an emergency, the SMS can be used to warn a large number of individuals. Ho...
Conference Paper
Full-text available
The IEEE 802.11 standard is playing an in- creasingly important role in next generation mobile radio networks. In order to fulll the requirements of such net- works, the Wireless LAN technology has to provide mech- anisms for transporting Quality-of-Service (QoS) enabled trafc in large Wireless LAN deployments. In this paper, we show that the exist...