Wojciech Burakowski

Warsaw University of Technology · Institute of Telecommunications

This paper shortly describes the IP QoS System which offers strict quality of service (QoS) guarantees in IP-based networks and supports a number of, so called, classes of services. Such solution requires to implement in the net-work a set of QoS mechanisms and algorithm working on packet, connection request and provisioning levels. Further-more, w...

Replacing the IPv4 protocol with IPv6 on the Inter-net is currently one of the aims of the European Union policy. The main reason for this replacement is the effeteness of the addresses pool in the IPv4 protocol, which can cause serious complications in the evolution of the Internet and its adapta-tion in new areas, e.g., in next generation mobile...

The first experience of quality by multimedia applications’ users takes place during the setup phase of a new connection. If the setup phase is not accepted or “slowly accepted”, the confidence of the user decreases. The user becomes more sensitive when he/she pays the connections with assured quality of service (QoS). In this case, the process of...

5G był mniej niż skromny. Wynikało to głównie z trzech przy-czyn: (1) decydującą rolę w specyfikacji zakresu tematycznego projektów europejskich miał przemysł europejski, a więc firmy takie, jak Telefonica, Nokia, Ericsson, France Telecom itd.; (2) dobór zespołów badawczych do realizacji danego projektu był ukierunkowany przez przedstawicieli przem...

W monografii dokonano oceny stanu aktualnego i tendencji w rozwoju telekomunikacji i teleinformatyki – obszarów związanych nierozerwalnie z technologiami ICT i mających wpływ na rozwój niemal wszystkich sfer ludzkiej aktywności. Przedstawiono uwarunkowania współczesnej telekomunikacji (i teleinformatyki) polskiej i światowej. Wskazano kluczowe dla...

This paper presents an analysis of a discrete-time multi-queue system handling a number of packet streams. The analysis focuses on calculating system state distribution and packet sojourn time distribution. The method relied upon for determining system state distribution is based on creating a number of equations that are solved numerically. Next,...

The explosive growth of the Internet has fundamentally changed the global society. The emergence of concepts like service-oriented architecture (SOA), Software as a Service (SaaS), Platform as a Service (PaaS), Infrastructure as a Service (IaaS), Network as a Service (NaaS) and Cloud Computing in general has catalyzed the migration from the informa...

The chapter summarizes activities of COST IC1304 ACROSS European Project corresponding to traffic management for Cloud Federation (CF). In particular, we provide a survey of CF architectures and standardization activities. We present comprehensive multi-level model for traffic management in CF that consists of five levels: Level 5 - Strategies for...

In the paper approximate formulas for the mean waiting times and the buffer dimensioning in the system with vacations fed by the stream of Poissonian type with constant service times is shown. Furthermore, in the considered system the time intervals of the availability/not-availability of the service are constant and are run alternately according t...

This paper discusses the potential role of the network infrastructure virtualization in designing Future Internet. Such infrastructure gives us possibilities for introducing new functionalities, which cannot be implemented in the current network. These new functionalities will be illustrated in the case of the currently designed IIP System, which i...

The paper analyses the system with vacations with deterministic busy and vacation periods, constant service times and Poisson input stream. For this system, we derive approximate formula describing mean waiting time as a function of mean waiting time of the equivalent system without vacations, lengths of busy/vacation periods and service time. The...

In this paper we describe the IIP System designed, implemented and currently tested in the frame of the Polish national project entitled "Future Internet Engineering"1 (in Polish "Inzynieria Internetu Przysz"- IIP). The IIP system uses virtualized network infrastructure that allows to set a number of, named, Parallel Internets essentially differing...

The provision of quality of service (QoS) in IP-based networks, namely QoS IP networks, has led to new demands for routing methods, protocols and algorithms. It is widely recognized that such QoS routing should take into account multiple criteria. In this case, contemporary approaches in multiple-criteria analysis should be taken into account, and...

In this paper we present the architecture that is currently under designing and prototyping phase in the frame of project entitled "Future Internet Engineering". We call the system following this architecture as System IIP (the acronym of Polish title of the project "Inżynieria Internetu Przyszłości -IIP"). The architecture explores virtualization...

The EuQoS (End-to-End QoS over Heterogeneous Networks) IST Integrated European Project aimed to define a Next Generation Network architecture that builds, uses and manages end-to-end QoS across different administrative domains and heterogeneous networks (UMTS, xDSL, Ethernet, WiFi, Satellite and IP/MPLS). The EuQoS architecture preserves the openne...

The first experience of quality by multimedia ap-plications' users takes place during the setup phase of a new connection. If the setup phase is not accepted or "slowly ac-cepted", the confidence of the user decreases. The user be-comes more sensitive when he/she pays the connections with assured quality of service (QoS). In this case, the process...

In this paper, we present the framework to provision end-to-end QoS in heterogeneous multi-domain networks that was implemented in EuQoS system and tested in Pan-European research network. It assumes that a pair of end users, possibly attached to different access networks as xDSL, UMTS, LAN/Ethernet, WiFi, MPLS or Satellite, may choose for its conn...

The IST European project EuQoS ("end-to-end QoS over heterogeneous networks ") has defined a NGN architecture that builds, uses and manages the end-to-end QoS path across different administrative domains and heterogeneous networks (UMTS, xDSL, Ethernet, WiFi and satellite access networks and IP/MPLS domains). The architecture follows a model more s...

Before accepting a new connection in QoS networks we need to check if the amount of required resources is available on the path from the source to the destination. In the case of QoS multi-domain networks, we need to make resource reservations in each domain on that path, as it has a place e.g. in EuQoS system. Choosing optimal strategy for resourc...

The EuQoS system is a complete QoS system, scalable to large dimensions and addressing QoS at all relevant layers, which has been developed within the framework of the IST-EuQoS project. Its design has been aided by a considerable amount of modeling and simulation work, aimed at testing the various QoS mechanisms devised and their interaction. This...

The European research project “End-to-End Quality-of-Service support over heterogeneous networks” (EuQoS) defined a novel architecture that builds, uses and manages the end-to-end (e2e) application exchanges and network paths with Quality-of-Service (QoS) guarantees across different administrative domains and heterogeneous networks. This chapter pr...

This paper deals with the problem of assuring strict QoS guarantees for the end to end connections that originate from Ethernet access network. It shows that despite high link capacities in some cases Ethernet network might be the reason of QoS deterioration. The primary reason is the lack of appropriate QoS differentiation and traffic isolation me...

In this paper, the EuQoS Consortium offers its first architecture release in order to provide an initial view on how end to end QoS is provided over multiple and heterogeneous networks. The EuQoS end to end Architecture has two views; a network deployment view across a number of autonomous systems (AS) domains and a software view within an AS. It w...

EuQoS is the acronym for "end-to-end quality of service support over heterogeneous networks", which is a European research project aimed at building an entire QoS framework, addressing all the relevant network layers, protocols, and technologies. This framework, which includes the most common access networks (xDSL, UMTS, WiFi, and LAN) is being pro...

EuQoS is the acronym for “end-to-end quali-ty of service support over heterogeneous net-works,” which is a European research projectaimed at building an entire QoS framework,addressing all the relevant network layers, proto-cols, and technologies. This framework, whichincludes the most common access networks(xDSL, UMTS, WiFi, and LAN) is being prot...

Providing quality of service (QoS) into the net-works based on the packet switched technologies, as ATM and IP, is currently the challenge for the military communi-cation system designers. The main element for achieving QoS capabilities is to implement effective admission control (AC) function, which regulates the volume of submitted traffic to the...

The paper proposes a new mechanism for wireless LAN networks IEEE 802.11 fully dedicated to handling CBR (Constant Bit Rate) streams that require constant packet transfer delay. The mechanism is targeted on improving packet transfer characteristics. This mechanism, named Self-synchronization Packet Transfer (SPT), is implemented in each station on...

The paper deals with the problem of assuring predefined QoS for real time (RT) class of service (CoS), which we define as one of inter-provider or inter-domain classes of service in IP network. We propose an analysis and adequate formulas to obtain admissible traffic load in a case when we map two end-to-end classes of service dedicated for telepho...

This paper introduces different AC (Admission Control) algorithms implemented in the multi-service AQUILA QoS IP network [4]. They are aimed at regulating volume of submitted traffic inside network services designed for handling real-time streaming VBR (Variable Bit Rate) and elastic (more precisely, produced by greedy TCP sources) flows. For strea...

The paper presents recent results corresponding to a new strategy for source traffic generating, named priority forcing scheme (PFS), allowing Internet users for getting bet-ter than best effort service in IP network. The concept of PFS assumes that an application, called PFS application, sends to the network a volume of additional traffic for the...

Enabling end-to-end QoS in the multi-domain network requires developing an efficient admission control mechanism. The paper discusses the issues related with inter-domain admission control based on user traffic declarations. The novelty of the proposed approach is that the traffic descriptors are recalculated in each domain taking into account the...

Now, a network operator must choose between two packet switched technologies for providing QoS in WAN networks, which are ATM and IP QoS [3, 4, 9]. As ATM has reached the maturity with capabilities for offering a number of different network services (i.e. CBR, VBR, ABR, UBR, GFR), the IP QoS with network services like expedited forwarding, assured...

The paper describes a new admission control (AC) algorithm for greedy TCP connections. The algorithm has passed positive tests in pre- production QoS IP network (2), developed inside European IST project AQUILA1 network. The algorithm operates per single TCP flow and it assumes the setting of advertised receiver TCP window size for maintaining idea...

The paper describes the traffic handling mechanisms implemented in the AQUILA pilot QoS IP network [AQUILA Project Consortium (2001)] [11]. The AQUILA architecture enhances the DiffServ concept [A Conceptual Model for DiffServ Routers (2000), An Architecture for Differentiated Services (1998), An Expedited Forwarding PHB (2001)] by adding new funct...

The paper presents trial experiments with IP QoS network services (NS) defined and implemented in the AQUILA pilot installation. The AQUILA NSs (Premium CBR, Premium VBR, Premium Multimedia and Premium Mission Critical) provide a framework for supporting a variety of applications generating both streaming and elastic traffic. The measurement experi...

The paper presents trial experiments with IP QoS network services (NS) defined and implemented in the AQUILA pilot installation. The AQUILA NSs (premium CBR, premium VBR, premium multimedia and premium mission critical) provide a framework for supporting a variety of ap-plications generating both streaming and elastic traffic. The measurement exper...

Future IP QoS (quality of service) networks are aiming at differentiating transfer quality of packets belonging to different flows. For this purpose, a set of network services (NS) with different QoS objectives is defined and implemented in the network. To a NS a certain amount of network resources, i.e. dedicated link capacity with associated buff...

The paper describes a new strategy for source traffic generating, named Priority Forcing Scheme (PFS), that can be attractive for Internet users to transfer its data traffic with better quality than this available in current IPbased network, in which best-effort service is the only one. The PFS scheme assumes that an application, called PFS applica...

This deliverable D3201 contains the first trial results performed in AQUILA testbeds. The experiments are related to network services, Admission Control algorithm, Resource Pool mechanism and RCL performance.

This deliverable details the system architecture used for the prototypes in the first trial.

This deliverable specifies the traffic handling mechanisms for the first trial.

The paper describes the traffic handling mechanisms implemented in the AQUILA pilot QoS IP network (10). The AQUILA project enhances the DiffServ architecture concept (1,2,3) by adding new functionality for admission control and resource management as well as by defining new set of network services. Each network service is optimised for specific ty...

The commonly recommended approach to meet the Constant Bit Rate (CBR) service requirements in ATM networks is to use the playback buffer mechanism implemented at the AAL layer [1],[2],[3]. This solution was originally proposed for the fibre optics ATM networks, where cell loss ratio is negligible (e. g. 10—9). However, for the wireless ATM network...

This paper evaluates the multiplexing gain we can reach on ATM radio-relay link, used for the purpose of inter-node transmission in the tactical networks. This link has limited capacity, e.g. from 2 up to 8 Mbps, and it can cause that profit of using ATM can be much less than expected. Note that ATM technology was mainly designed for integrated net...

this document, several methods of AC for stream traffic based on declared parameters and using bufferless multiplexing are proposed.

this document was presented at the IFIP Conference on Personal Wireless Communications (PWC'2000) in Gdansk, Poland, 14-15 September 2000

The paper points out on some limitations introduced by access points in wireless ATM network that have great impact on supporting end-to-end communication services with QoS requirements like CBR, VBR, ABR and GFR. Analysed access protocol is MEDIAN [5], which belongs to PRMA (Packet Reservation Medium Access) class and works under TDMA scheme. It a...

The paper focuses on some difficulties in performing the CAC (connection admission control) function in the case of an ATM tactical network with wireless access points controlled by a dynamic TDMA (time division multiplex access) class protocol. The medium access protocol assumed for the purposes of this paper is MEDIAN. Specific characteristics of...

The paper summarises the work on wireless networks inside the COST 257 project, entitled “Impact of new services on the architecture and performance of broadband networks” and chaired by Prof. Tran-Gia of the Technical University of Würzburg (Germany). This project was established for 4 years (1996–2000) and collected the researchers from 16 Europe...

The paper refers to the queue management algorithm problem for handling submitted to the system traffic flows with different quality of service. The investigated approach, called QMA-R (Queue Management Algorithm with Reservations), assumes queue place reservations made by consecutive customers entering the system and belonging to the selected flow...

This report gives an overview of results on the Available Bit Rate Service Category (ABR) for ATM networks obtained in the COST 257 action on "Impacts of New Services on the Architecture and Performance of Broadband Networks". First we give an overview of the ATM Forum specifications of the ABR service category. Examples of ABR switch mechanisms ar...

The paper presents an evaluation of network services (CBR, VBR and TCP over UBR) in the future ATM tactical network. The included numerical results refer to the tested network configuration, called the extended bottleneck topology. Compared to cable ATM network, the studied system takes into account the wireless environment of the tactical network....

ATM networks have to handle at least two types of traffic. A Guaranteed Bandwidth Traffic (GBT), and the so-called Best Effort Traffic (BET). In order to handle these types of traffic properly, ATM network must, firstly, guarantee the QoS of the GBT, and secondly, at the same time, obtain a high level of network resources utilization by serving the...

This paper addresses the problem of handling best effort traffic (BET) in ATM networks. This type of traffic usually consists of information cell transfer without any guarantees about the quality of service. We show that its transfer characteristics strictly depend on the cell scheduling mechanisms used in the ATM switches. The comparative studies...

The paper deals with the problem of queue size dimensioning for the ABR traffic. The analytical formulas are derived which allow to evaluate the upper bound for queue size. For this purpose the step unit function is assumed to represent the worst case of the high priority traffic (the guaranteed traffic) from the point of view of the ABR queue beha...

In this paper we present an Explicit Rate (ER) ABR flow control algorithm. It directly measures the available link capacity as well as takes into account the ABR buffer occupancy. More specifically, the explicit rate calculated by the switch is proportional to the difference between predefined threshold and the actual state of the queue. Therefore,...

The paper deals with the problem of priorities in the ATM military networks. The standard for the public network defines only two priorities operating on the cell level which are used to mark these cells which do not confirm the traffic contract; the marked cells are sent with low priority and can be discarded in the switch when congestion occurs....

In the first phase of the ATM introduction connectionless services constitute a high percentage of the whole traffic. This is due to the great interest in high speed computer interconnection and long distance LAN emulation. This type of traffic in the classical computer networks is served mainly by the TCP transport layer protocol (and the datagram...

The ATM Forum has defined two modes of operation for the ABR (available bit rat) congestion control algorithm, i.e. the explicit rate indication (ERI) and the binary congestion indication (BCI). As the standardization process is mainly focused on the UNI interface, the switch mechanisms are left to the vendors. The objective of the ERI algorithm is...

The paper presents traffic analysis of a data transmission concentrator utilizing the principle of channel switching in time domain. The concentrator multiplexes traffic generated by data terminals operating at several transmission speed rates: 0. 6 kbit/s, 2. 4 kbit/s, 4. 8 kbit/s, 9. 6 kbit/s. A 64 kbit/s digital channel is the output of the conc...

The paper presents an approach for providing requested throughput guarantees, say R req , for greedy TCP (Transmission Control Protocol) connections (e.g. ftp). For this purpose, we recommend at the network entry point to shape, with rate R, traffic emitted by each of TCP connections as well as to perform CAC (Connection Admission Control) function...

The paper presents approximate methods for evaluation of mean waiting time in a priority tandem-queue system fed by a single task sequence according to a Poissonian process. A task sequence consists of several tasks executed one after the other in a prescribed order. Each task is characterized by: the position in sequence, the number of server the...

The QoS IP network concept is presently under definition and testing phase. The objective of this network is to provide a variety of communication services to meet multi-service network requirements, as it was effectively made in the case of ATM. This paper investigates, so called, Premium service defined inside the DiffServ architecture and design...

This paper presents a part of activities carried out by the team from the Warsaw University of Technology for the 6. FR EuQoS IST project. The investigated subject is related with a framework for providing QoS (Quality of Service) capabilities in a multi-domain heterogeneous network environment. More specifically, we follow the concept of introduci...