ANNUAL REPORT 1999 Laboratory of Telecommunications Technology

ANNUAL REPORT 1999 Laboratory of Telecommunications Technology
Laboratory of Telecommunications Technology
ANNUAL REPORT 1999
TEKNILLINEN KORKEAKOULU
TEKNISKA HÖGSKOLAN
HELSINKI UNIVERSITY OF TECHNOLOGY
TECHNISCHE UNIVERSITÄT HELSINKI
UNIVERSITE DE TECHNOLOGIE D’HELSINKI
The Laboratory of Telecommunications Technology
Annual Report 1999
PREFACE
The last year of the 20th century was for the Laboratory of Telecommunications Technology
both a year of continuous development and growth but also a year of some important
changes.
The laboratory was run by the three year old team of professors Raimo Kantola, Timo
Laakso, and Jorma Virtamo. Prof. Timo Laakso, however, took a leave of absence from the
office for the second half of the year, and Ramin Baghaie was nominated as an acting
professor for that period. Prof. Jorma Jormakka was nominated, starting from January 1,
2000, to the new Chair of Communications Engineering, a shared Chair between the HUT
and the National Defense College, with the specific scope of data communication protocols,
software, and services.
The internationalization of the laboratory proceeded rapidly. Longer visits took place both by
researchers from other countries in our laboratory and by our researchers in Universities
abroad. Three Master's theses were completed by students from Spain. The recruitment of
foreign staff continued, including a post doc researcher from China. An important milestone
was the start of the Master's Programme, with prof. Raimo Kantola acting as the head of the
programme. Some 50 students were enrolled in this programme in Fall 1999.
In the area of teaching, other notable events were e.g. the Telecommunications Forum,
organized for the third time with an ever increasing success. In the study year 1999-2000, two
majors were offered. In addition to the existing Telecommunications Technology major, the
major in Teletraffic Theory was created. The courses provided by the laboratory were
developed, and one course was given in English as part of the Master's programme. The
textbook "Tietoliikenneaapinen" by Seppo Uusitupa and Kirsi Voipio was published early
1999, and was later given the "Textbook of the Year" award by HUT. In addition the booklet
"How to write a diploma thesis" by Timo Laakso became ready for a widespread use. The
laboratory was actively involved in the development of the two new degree programmes of
the department of ECE as well.
At the end of the year, part of the laboratory moved to a temporary location due to the plans
to enlarge and renovate the department building. A further partial move is foreseen at the end
of 2000, when hopefully the temporary arrangements will be over and the laboratory can
continue to work in a stable environment.
An important change took place at the end of the year, when it was decided that the Chair
held by Prof. Timo Laakso, and his whole research group, would move to the Laboratory of
Signal Processing and Computer Technology in the beginning of year 2000. The decision was
motivated by the desire to make the research and teaching profiles of the laboratories clearer.
It is our belief that this change, in the long run, will benefit both laboratories and make them
better prepared to meet the challenges of the future.
These and other developments in 1999 are described in more detail in this Annual Report.
Jorma Virtamo
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Annual Report 1999
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Annual Report 1999
1
INTRODUCTION .....................................................................................................................5
1.1
1.2
1.3
1.4
1.5
1.6
1.7
2
GENERAL .....................................................................................................................................5
RESEARCH....................................................................................................................................5
TEACHING ....................................................................................................................................6
DEPARTMENTAL ACTIVITIES ........................................................................................................7
INTERNATIONAL CO-OPERATION ...................................................................................................7
OTHER LABORATORY ACTIVITIES ................................................................................................8
KEY FACTS 1999 ..........................................................................................................................8
PERSONNEL.............................................................................................................................9
2.1
2.2
2.3
3
LABORATORY STAFF.....................................................................................................................9
PART-TIME TEACHERS & ASSISTANTS.........................................................................................11
GUEST LECTURERS .....................................................................................................................11
RESEARCH PROJECTS .......................................................................................................12
MI2TTA - MODELS FOR INTEGRATED INTERNET AND TELECOMMUNICATION NETWORKS TRAFFIC
AND ARCHITECTURE ..................................................................................................................12
3.2 RADIO INTERFACE AND NETWORK DESIGN TECHNIQUES IN 3RD-GENERATION RADIO SYSTEMS
(RAVE) .....................................................................................................................................12
3.3 ADAPTIVE DETECTION FOR MULTIPLE-ANTENNA CDMA SYSTEMS ............................................14
3.4 FAST DIGITAL SUBSCRIBER LINE (DSL) TECHNOLOGIES IN BROADBAND TRANSMISSION ...........15
3.5 ADAPTIVE SIGNAL PROCESSING ALGORITHMS FOR 3RD-GENERATION MOBILE COMMUNICATION
TECHNOLOGY (ASPA)................................................................................................................16
3.6 IMPLEMENTATION OF REAL-VALUED DISCRETE TRANSFORMS VIA ALGEBRAIC INTEGERS
QUANTIZATION ...........................................................................................................................17
3.7 COST 257..................................................................................................................................17
3.8 COM2 - COMPUTATIONAL METHODS FOR THE PERFORMANCE ANALYSIS OF BROADBAND
COMMUNICATION NETWORKS ....................................................................................................18
3.9 USETRAM - USER TRAFFIC MODELLING FOR FUTURE MOBILE SYSTEMS .............................19
3.10 STUDIES IN QUEUING THEORY.....................................................................................................20
3.11 IPANA / IP VOICE .....................................................................................................................20
3.12 IPANA / IP SWITCHING..............................................................................................................21
3.1
4
TEACHING .............................................................................................................................23
4.1
4.2
4.3
5
ACTIVITIES............................................................................................................................29
5.1
5.2
6
INTERNATIONAL CONFERENCES AND MEETINGS .........................................................................29
FOREIGN VISITORS IN 1999 .........................................................................................................30
PARTICIPATION IN BOARDS AND COMMITTEES .....................................................31
6.1
6.2
6.3
7
DEVELOPMENT OF TEACHING .....................................................................................................23
COURSES ....................................................................................................................................23
DEGREES ....................................................................................................................................25
UNIVERSITY BOARDS AND COMMITTEES .....................................................................................31
OTHER BOARDS AND COMMITTEES .............................................................................................31
REFEREE ACTIVITIES...................................................................................................................32
PUBLICATIONS.....................................................................................................................33
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Annual Report 1999
1 INTRODUCTION
1.1
General
The process of filling the two new Chairs, which were established in the preceding
year, was started early 1999. After an initial round intended to find interested
candidates, it was decided to proceed with the process for one of the Chairs, a shared
Chair between the HUT and the National Defense College. Finally, this lead to the
appointment of prof. Jorma Jormakka, formerly with the Lappeenranta University of
Technology, to the Chair of Communications Engineering for a five year term starting
from 1.1.2000. The specific scope of the new Chair was defined to be data
communication protocols, software and services.
Internationalization of the laboratory continued by visits of outside experts in the
laboratory and visits by our researchers in other laboratories abroad. The longer visits
by Prof. Vinod Sharma from Bangalore, India, and Mr. Attila Vidács, Ph.D. student
form Budapest, Hungary, already started in 1998, continued but took end by the
middle of the year. Dr. Zhang Peng from China joined the IPANA project in August to
spend a post doc period in the laboratory. Dr. Samuli Aalto made a six months visit to
EURANDOM, a new institute at the Eindhoven University of Technology devoted to
studies of stochastic phenomena and their applications. Mr. Stefan Werner visited the
Signal Processing Laboratory at the Federal University of Rio de Janeiro for a period
of 11 months.
In addition, three Master's theses by Spanish students were also de facto completed in
the laboratory during the year.
An important restructuring decision of the Laboratory of Telecommunications
Technology was taken at the end of the year, when it was agreed that the Chair held by
Prof. Timo Laakso, as well as his research group, would move to the Laboratory of
Signal Processing and Computer Technology in the beginning of year 2000. This
move will make the research and teaching profiles of the laboratories more
streamlined and thus better enables the development of the respective laboratories.
From the practical point of view, the separation will be gradual, as the research group
will for the present stay in the premises of the Laboratory of Telecommunications
Technology.
1.2
Research
As to the external framework, this year mostly represented a steady continuation of the
projects already in progress in 1998:
The IP/ATM Network Architectures (IPANA) project continued for the third year,
with two subprojects: IP Switching and IP Voice. In IP switching, research on traffic
classification continued. Important extensions were multi-class classification and
using packet interarrival times for classification. We now see the use of traffic
classification to be connected with the introduction of Differentiated Services. Class
based routing was started as a new topic under IP switching. The first result was the
development of a Quality of Service Routing Simulator supporting routing
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simulations for the Integrated Services Internet. In IP Voice, the development of the
protocols for the Numbering and Routing Infrastructure for the hybrid packet and
circuit switching network (SCN) was continued. We have now formulated our goal to
be the development of a routing information testbed for the IP/SCN network. In
addition we continued building our competence in IP based telephony signalling.
In the area of traffic theory and engineering, the project Mitta, funded by the Academy
of Finland was finished at the end of 1998, and a new follow-up project Mi2tta was
started in 1999. Otherwise, the work continued in the projects COST 257 and Com2.
Two major achievements in these projects were the development of an algorithm for
exact calculation of end-to-end blocking probabilities in multicast networks, and the
development of an nearly optimal importance sampling method, which allows a
speed-up by several orders of magnitude in the Monte Carlo estimation of the end-toend blocking probabilities in multiservice networks. Good progress was also made in
the studies of optimal routing methods and related problems both in ordinary
multiservice networks and in WDM networks. A new approach for analyzing the
behavior of RED buffer management scheme was also developed.
The research in signal processing in communications continued in two TEKES funded
projects. The VDSL project has concentrated on capacity analysis of practical
connections and on network design aspects. The WCDMA research has focused on
design of adaptive receiver algorithms for 3rd-generation systems, where cooperation
with the Federal University of Rio de Janeiro, Brazil has been active, in the form of
mutual visits.
1.3
Teaching
Preparation for the new Master's Programme in Telecommunications was continued
and the programme was started in fall 1999 with some 50 students with B.Sc.
background enrolled. The programme, jointly organized by the Department of ECE
and the Department of Computer Science and Engineering, is the first degree
programme at Helsinki University of Technology for English speaking foreign
students with the objective of increasing the number of M.Sc. degrees awarded to
foreign students. Currently, the programme provides majors in Telecommunications
Software and in Radio Communications. The course 38.145, Introduction to
Teletraffic Theory, was produced in English specifically for the Master's Programme.
Telecommunications Forum, the Studia Generalia on hot topics in
Telecommunications, was organized for the third time. This year the course attracted
more students than ever before. The course has firmly established itself as the event of
the fall term.
In 1999, the old Telecommunications Technology major, with different paths, was
split into two separate majors. The new offspring is the major in Teletraffic Theory,
and Jani Lakkakorpi, who worked as a research assistant in the laboratory, was the
first student to receive the Master's degree with this major.
The book "Tietoliikenneaapinen" (The ABC of Telecommunications) by Seppo
Uusitupa and Kirsi Voipio, was published in the beginning of the year. The book has
been a success, and it was later given the "Textbook of the Year" award by HUT.
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Timo Laakso's booklet "How to write a diploma thesis" was also finalized and
released for a widespread use within the department. The booklet focuses on
mastering the writing process of a thesis. It is written in an easy style, giving many
useful hints on how to proceed with the work and how to avoid getting stuck in the
case of obstacles. It will certainly be found useful by students and supervisors alike.
In addition, efforts were directed in improving the existing material for many of the
laboratory's courses.
1.4
Departmental Activities
A decision of dividing the current degree programme of the department of ECE into
two separate programmes, one of them being the programme of Telecommunications
Technology, was taken and approved by the Ministry of Education towards the end of
the year. The new degree programme structure will be adopted already for the
admission of new students in 2000. To this end, the planning of the contents and
detailed structure of the programme was started.
During the year, it became clear that the plans of the ECE department for the
enlargement of the current department building required the removal of part of the
laboratory to a temporary location. A further partial move is foreseen at the end of
2000. The process of planning the new premises and the temporary location, as well as
planning the removals and relocation of the people, disturbed a steady operation of the
laboratory to some extent. We hope, however, that at the end of year 2000, the
temporary arrangements will be over, and the laboratory can continue to work in a
stable way in ever better premises.
1.5
International co-operation
Samuli Aalto visited EURANDOM as a Research Fellow for a half-year (1.1.1.7.1999). EURANDOM is a novel European research institute for the study of
stochastic phenomena, located on the campus of Eindhoven University of Technology
in the Netherlands. During the visit S. Aalto participated in the Stochastic Networks
project led by Professors Boxma and Wessels, continuing the studies on stochastic
fluid queues and batch service queueing systems he had started in his PhD Thesis.
During his visit S. Aalto gave four presentations (two in EURANDOM, one in CWI,
and one in the University of Twente). S. Aalto also attended the 16th International
Teletraffic Congress (ITC-16) in Edinburgh in June and three workshops arranged in
the Netherland.
Stefan Werner visited the Signal Processing Laboratory at the Federal University of
Rio de Janeiro during the period 2.2. - 10.12.1999. The Signal Processing Laboratory
is the Centre of Excellence in signal processing accredited by the Brazilian council for
research and development. During the visit S. Werner cooperated with Prof. Diniz and
Prof. Campos in the area of low-complexity adaptation algorithms.
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1.6
Other Laboratory Activities
Development discussions, now recommended for general use within the University,
and adopted as a standard practice in the laboratory already three years ago, were
continued. A development day, with the participation of the whole laboratory staff,
was held in Sjökulla in May. The theme of the day centered around the question of
how to make our research work more productive and goal oriented. An invited speaker
was Prof. Mikko Paalanen, the head of the Low Temperature Laboratory.
A showcase display of the history and development of the telecommunications
technology and telephony was planned and built. The architects behind this
demonstration were Kirsi Voipio and Mari Sipilä, a summer trainee. The showcase is
placed in the main corridor of the department close to the premises of the laboratory
where it continuously attracts the attention of students and visitors.
Some recreational events were also arranged during the year. One of the most
memorable ones was the church boat trip made under very favorable weather
conditions in June to a nearby island.
Fig. 1. The church boat trip.
1.7
Key facts 1999
Masters thesis
45
Lic.Tech. thesis
2
International journal publications
5
Conference presentations
24
Other publications
16
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2 PERSONNEL
2.1
Laboratory staff
Baghaie, Ramin
Kantola, Raimo
Kilkki, Kalevi
Laakso, Timo
Pirinen, Aulis
Rahko, Kauko
Virtamo, Jorma
Lic.Sc. (Tech.), professor
D.Sc. (Tech.), professor
D.Sc. (Tech.), docent
D.Sc. (Tech.), professor
Ph.D., docent
D.Sc. (Tech.), professor emeritus
D.Sc. (Tech.), professor, head of laboratory
Aalto, Samuli
Beijar Nicklas
Brax, Veikko
Costa Requena, Jose
Erke, Tapio
Espigares, Inmaculada
Gyasi-Agyei, Amoakoh
Haapala, Juho
Hietala, Petri
Hlinovsky, Jan
Hyytiä, Esa
Hänninen, Arja
Ilvesmäki, Mika
Insa Hernandez, Richardo
Kaikkonen, Sampo
Karttunen, Petri
Kettunen, Kimmo
Kosonen, Vesa
Kuusela, Pirkko
Lakkakorpi, Jani
Lassila, Pasi
Lindfors, Anna-Kaisa
Lemetyinen, Mirja
Liu, Yaohui
Luoma, Marko
Ma, Zhangsong
Marjamäki, Harri
Mäntylä, Harri
Nieminen, Klaus
Nupponen, Esko
Nyberg, Eeva
Peuhkuri, Markus
Pitkäniemi, Kimmo
Renko, Jari
Rummukainen, Hannu
Ph.D., senior researcher
Research assistant
M.Sc., research scientist
M.Sc., research scientist
Laboratory engineer, on leave of absence
M.Sc., research scientist
M.Sc., research scientist
Research assistant
Laboratory technician
Research assistant
M.Sc., research scientist
Department secretary
M.Sc., senior research scientist
research assistant
research assistant
M.Sc., research scientist
M.Sc., senior research scientist
M.Sc., research scientist
Ph.D., senior research scientist
M.Sc., research assistant
Lic.Sc. (Tech.), research scientist
Research assistant
Department Secretary
M.Sc., research scientist
M.Sc., senior research scientist
Research assistant
Research assistant
M.Sc., research scientist
Student adviser
Senior laboratory supervisor
M.Sc., research scientist
M.Sc., senior research scientist
Research assistant
M.Sc., research scientist
Research assistant
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Suominen, Jukka
Sipilä, Mari
Syväsalmi, Sari
Uusitupa, Seppo
Voipio, Kirsi
Vidács, Attila
Werner, Stefan
Zhang, Peng
Research assistant
Research assistant
Secretary
Lic.Sc. (Tech.), senior engineer
Research assistant
M.Sc., research scientist
M.Sc., research scientist
Ph.D., research scientist
Fig. 2: The personnel of the Laboratory of Telecommunications Technology.
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2.2
Part-time teachers & assistants
Kati Ahvonen
Jaakko Aarnio
Reijo Juvonen
S-38.202
S-38.164
S-38.164
Telecommunications Engineering Project I
Broadband Switching Technology
Broadband Switching Technology
Jorma Lilleberg
S-38.220
Petteri Mannersalo
Petteri Mannersalo
Jukka Mononen
S-38.145
S-38.149
S-38.128
Ilkka Norros
Antti Pietiläinen
Ari Tervonen
S-38.149
S-38.164
S-38.164
Postgraduate course in Signal Processing in
Telecommunication
Introduction to Teletraffic Theory
Postgraduate Course in Teletraffic Theory
Telecommunications Technology, special
assignment
Postgraduate Course in Teletraffic Theory
Broadband Switching Technology
Broadband Switching Technology
2.3
Guest lecturers
S-38.001 Telecommunications Forum
Ala-Pietilä, Pekka
Eloholma, Tero
Johannesdahl, Harri
Karpakka, Jari
President
Director
Managing Director
Director
Keskiivari, Pekka
Kilkki, Kalevi
Laaksonen, Tero
Paajanen, Reijo
Siilasmaa, Risto
Valtonen, Mato
Director
Principal Scientist
President
Senior Vice President
President, CEO
General Director
Nokia
Siemens Business Services
Saunalahti
Helsinki Telephone Corporation,
Kolumbus services
Sonera Mobile Communications
Nokia Research Center
Telia Finland
Nokia Wireless Bus Comms
Data Fellows
WapIT
S-38.191 Corporate networks
Lars Arnkil
Matti Hilli
Lauri Halme
Jukka Hokkanen
Heikki P S Leivo
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Jyrki Laine
Matti Lahti
The Laboratory of Telecommunications Technology
Annual Report 1999
3 RESEARCH PROJECTS
3.1
Mi2tta - Models for Integrated Internet and Telecommunication
networks Traffic and Architecture
Project leader
Researchers
Jorma Virtamo
Marko Luoma, Markus Peuhkuri
MI2TTA is part of the Finnish contribution to the European COST 263 Action, in
which laboratories and research institutes from 12 countries participate. The research
is funded by the Academy of Finland. The project focuses on issues of traffic
management and measurements in the Internet, particularly in the QoS aware Internet.
The project has so far devised:
•
A flexible, non-intrusive, measurement system for a long time scale continuos
measurement of Internet traffic. This system has ability to do analysis and to
capture traffic for more than a week in a single sample. This has been possible by
implementing a novel compression mechanism for data representation, with a
minimal amount of lost information.
The data obtained using this tool has been extensively used in other projects:
Com2, COST257, and IPANA.
•
3.2
A simulation model for the Differentiated Services based Internet environment.
This simulator is able to simulate Assured Forwarding, Expedited Forwarding and
Best Effort traffic classes implemented with Weighted Round Robin, Processor
Sharing and Priority scheduling. The simulator is build on the commercial
simulation tool - BONeS.
rd
Radio Interface and Network Design Techniques in 3 -generation
radio systems (RAVE)
Project leader
Researchers:
Timo Laakso
Ramin Baghaie, Petri Karttunen, Kimmo Kettunen, Stefan
Werner
This is a two-year project of the Institute of Radio Communications (IRC). The IRC
was established in 1993 to coordinate research on radio communications by several
laboratories of the department. The research is funded by TEKES and industry
partners including Nokia, Sonera, and Helsinki Telephone Company. The RAVE
project has focused on new mobile communications systems and it divides into
several subprojects. Our subproject is Region B: Radio interface and algorithms,
which further divides into the following projects of our laboratory:
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Element M
Fig. 3. Multiple antenna-element receiver enables the increase in the system
capacity of the future WCDMA telecommunication systems by employing clever
adaptive array processing algorithms.
3.2.1 User tracking systems
Researcher:
Petri Karttunen
This subproject has focused on the development of fast and robust user tracking
algorithms for a base station in the wideband code division multiple access (CDMA)
receivers with multiple antenna elements. Methods for mobile user tracking systems
should provide fast tracking capability and small parameter estimation errors at low
hardware complexity.
The conventional gradient based least mean squared (LMS) adaptive algorithm was
employed for the tracking system for which the performance was improved by the
developed adaptive step size method. Furthermore, the conjugate gradient based
tracking method was analysed, and a simplified gradient based high-resolution noise
subspace approach was developed for user tracking.
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Fig. 4. Illustration of a base station antenna working in the beamforming mode in
a rural area.
3.3
Adaptive detection for multiple-antenna CDMA systems
Researchers:
Stefan Werner, Paulo Diniz, Jose Apolinario, Marcello de Campos
Adaptive interference suppression is of importance in the wideband CDMA mobile
receiver.
The demand on robust and low-complexity algorithms is of interest to reduce the
power consumption at the receiver. To speed up the convergence of the standard least
means square (LMS) algorithm at low additional complexity, the binormalized datareuse LMS (BNDR-LMS) algorithm can be used. In addition, low misadjustment error
can be attained by utilizing the concept of set-membership filtering (SMF). The SMF
only executes a coefficient update when the output estimation error exceeds the
specified limits, which requires fewer computations and lower misadjustment error.
This project has been carried out in cooperation with Prof. Paulo Diniz's group at the
Federal University of Rio de Janeiro whose expertise is in the field of adaptive
algorithms. Prof. Diniz himself as well as his colleagues Jose Apolinario and Marcello
de Campos have contributed in the project during their visits to our laboratory in 1998
and 1999.
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3.3.1 Implementation of fast algorithms for multiple-antenna CDMA
systems
Researcher:
Ramin Baghaie
This project addresses the methodologies needed to design VLSI circuits for systems
that require higher throughput or lower power consumption. This is of great
importance when implementing mobile communication systems. Some of the
techniques that are presented in this project are applied to the DSP algorithms needed
in the previous subprojects.
The first part of this project considers high-level algorithm transformation techniques
such as the look-ahead (LA), relaxed look-ahead (RLA), and strength reduction (SR).
For the pipelined implementation of adaptive mobile receiver the LA and RLA
techniques have been utilized. As a result, higher throughputs or lower power
consumption were achieved. The second part of this project addresses several highlevel architectural transformations that can be used to design families of architectures
for a given algorithm. These transformations include pipelining, retiming, unfolding,
and array processor design. Pipelined DSP algorithms allow us to tradeoff speed,
power, and area during the course of VLSI implementation.
3.3.2 Multiuser receivers and channel coding
Researcher:
Kimmo Kettunen
The classical multiuser receiver algorithms of Verdu, Varanasi and Aazhang, et al.
have been implemented completely without error-correction coding which is assumed
to be separate. However, it is known that better results in terms of bit error rate can be
obtained by considering them in the same process. This project addresses the problem
of joint detection and decoding in a multiuser wideband CDMA receiver. Iterative
techniques have been investigated which implement interference cancellation type
detection and iterative channel decoding in an alternating manner. Cooperation with
prof. Aazhang’s group at the Rice University, Houston, USA, was initiated by Mr.
Kettunen’s 3-week visit there in May 1999.
3.4
Fast Digital Subscriber Line (DSL) technologies in broadband
transmission
Project leader:
Researchers:
Timo Laakso
Amoakoh Gyasi-Agyei, Yaohui Liu, Harri Mäntylä
This 3-year project started in 1998 and is carried out together with prof. Markku
Renfors' group in the Telecommunications laboratory of Tampere University of
Technology. It is funded by TEKES and industrial partners (Nokia
Telecommunications, Tellabs, Helsinki Telephone Company, and Tampere Telephone
Company). The main objective of the research is to develop technology for the reuse
of old copper telephone wiring for multi-megabit transmission using advanced signal
processing techniques.
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3.4.1 Channel measurements and modelling
Researcher:
Yaohui Liu
In this project, the telephone line measurements carried out in Tampere are analysed.
The focus is on interference measurements and modelling and in capacity analysis of
connections. Special attention has been paid to radio frequency interference (RFI)
caused by radio amateur transmissions. RFI has been found to be one of the most
problematic disturbances for VDSL transmission, due to its coupling in indoor
telephone wirings.
3.4.2 Design of pulse shaping filters
Researcher:
Amoakoh Gyasi-Agyei
This subproject focuses on pulse shaping filter design for CAP/QAM type line code.
Efficient FIR filter design techniques employing symmetric coefficients have been
studied. Furthermore different frequency allocation alternatives for the use in the
single-carrier transmission have been investigated.
3.4.3 Design of VDSL networks
Researcher:
Harri Mäntylä
Different schemes for implementing the subscriber networks are studied. The basic
issue is how close to the subscribers the optical fiber should be brought and what kind
of network architectures should be utilized.
3.5
rd
Adaptive signal processing algorithms for 3 -generation mobile
communication technology (ASPA)
Project leader:
Researchers:
Ramin Baghaie
Ricardo Insa Hernandez, Kimmo Kettunen
In this project, practical implementations of the Gram-Schmidt Conjugate Direction
and Conjugate Gradient algorithms were studied and compared. We illustrated that
although theoretically the CG algorithm must converge in at most N steps, in practice
for large R it may not happen. As a result, due to round-off errors different resetting
schemes and more iterations were required. On the other hand, we demonstrated that
the GSCD method always converges at most in N steps. Furthermore, the fixed-point
implementation of the above mentioned algorithms were studied and presented. For
more realistic results, the algorithms were applied to a multiuser detection scheme in a
DS-CDMA system. In these simulations, for different number of users, different
number of iterations and different wordlengths the MSE errors were calculated.
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3.6
Implementation of real-valued discrete transforms via algebraic
integers quantization
Researchers:
Ramin Baghaie, Vassil Dimitrov
In this project, we have focused on a novel approach for computing real-valued
discrete transforms such as the discrete cosine transform (DCT) and the discrete
Hartley transform (DHT). The approach is based on the algebraic integers encoding
scheme. With the aid of this scheme, an error-free representation of the cos, sin, and
cas functions becomes possible. For further complexity reduction, different
approximation methods were presented. Furthermore, for the implementation of these
algorithms a fully pipelined systolic architecture with O(N) throughput was proposed.
3.7
COST 257
Project leader:
Researchers:
Jorma Virtamo
Samuli Aalto, Esa Hyytiä, Eeva Nyberg, Jari Renko
COST 257 is a joint project between the Laboratory of Telecommunications
Technology at HUT and VTT Information Technology. It represents the Finnish
contribution to the European COST 257 Action, in which laboratories and research
institutes from 18 countries participate. The research is mainly funded by TEKES with
the support of Nokia Telecommunications and Sonera. The research focuses on
developing models and methods for the performance analysis of telecommunication
systems. The following problem areas have been addressed:
•
Calculation of end-to-end blocking probabilities in a multicast network, where an
originating node sends several transmissions, "programs", via separate dynamic
multicast trees, which the users can join and leave. An exact algorithm has been
developed for the solution of this problem. The algorithm is based on alternatingly
applying a new mathematical construction, OR-convolution, and truncation on the
channel state distributions. The algorithm was extended to cover also the case of
Poissonian background traffic. Dimensioning aspects of a multicast network were
examined.
•
Routing and wavelength allocation in WDM networks without wavelength
conversion at the nodes. Heuristic algorithms for optimal solution of the static
problem have been refined and tested. The dynamic case, where connection
requests arrive according to a Poisson process has been studied. A new approach
based on the Markov Decision Theory has been developed. Any heuristic policy
can be improved by so-called policy iteration, where the relative costs of states are
estimated on-the-fly by simulations.
•
Multiprotocol Label Switching, MPLS. A technology report on the current status
and prospects of the MPLS concept has been compiled.
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3.8
Com2 - Computational Methods for the Performance Analysis of
Broadband Communication Networks
Project leader:
Researchers:
Jorma Virtamo
Samuli Aalto, Jan Hlinovsky,Pirkko Kuusela Jani Lakkakorpi,
Pasi Lassila, Aleksi Penttinen, Vinod Sharma, Hannu
Rummukainen Attila Vidács
The aim of the project is to develop computational methods for the performance
analysis of broadband communication networks. The scope of the project
encompasses: 1) Development of queueing models applicable to communication
networks and methods for the solution of these models as well as the related
optimization problems. 2) Development of variance reduction techniques for the
speed-up of simulations. 3) Development of models for long-range dependent traffic
and methods for the estimation of the parameters of the models. A program library is
being created and maintained of the algorithms resulting from the project.
Specifically, the milestones in 1999 were:
•
The work on effective simulation of multiservice loss systems (such as an ATM
network considered at the call level) has been continued. A nearly ideal
importance sampling method has been developed by which speed-up factors in the
range of 103-105 can be achieved. In this method, the problem is first broken down
into independent one-link problems. Then, in each subproblem, samples are
generated directly from the conditional distribution in the set on blocking states of
the link. This is possible to do exactly by a method called inverse convolution.
The method is fast but requires storage of large tables. The storage requirements
can be avoided by another method, called Gaussian method, but this requires more
computation per sample and leads, due to some unavoidable approximations, to
less optimal results, though even these are far better than anything reported in the
literature before. The developed method leaves virtually no room for further
improvement.
D
x2
1
x2
D
2
D
1
D
D
2
D
3
3
h1(x)=
B
h1(x)=
h1(x)=1/2
x1
x1
Fig. 5. Decomposition of the set B into three subsets (D1, D2, D3) and the possible
values of h1(x) in different parts of D1.
•
The performance of RED algorithm has been studied (RED is a buffer
management scheme proposed for routers in the Internet). A new approach has
been developed by which the transient behaviour of a RED controlled buffer can
be analyzed. The analysis focuses on the evolution of the expectations of the
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exponentially averaged queue length and the instantaneous queue length. An
ordinary differential equation (ODE) has been derived for the expected
exponentially averaged queue length. In a simpler scheme, where quasistationarity assumption is made, an autonomous ODE is obtained. In a more
refined scheme, capable of explaining the oscillatory behaviour of the system, this
is augmented with another ODE describing the expected instantaneous queue
length. A fairly good agreement with simulation results has been observed. The
dependence of the mean queue lengths on the traffic parameters has also been
examined for a multi traffic class system.
•
A method has been developed for the estimation of the Hurst parameter of data
traffic obeying the fractional Brownian motion process. The aim of this new
method is to reduce the number of sample points required for a given accuracy.
This is obtained by using a geometric sampling grid. Intuitively, such a grid a)
being "self-similar" fits neatly to the scheme b) removes redundant points c) sees
many time scales with fewer samples. The maximum likelihood principle is
applied for the estimation. This requires the calculation of the inverse covariance
matrix. Based on the observation that the covariance function is nearly linear,
approximations for the inverse covariance matrix have been derived. Numerical
experiments show that the method, indeed, works well and outperforms wavelet
based methods, which have recently become popular.
•
Optimal routing in circuit switched multi bitrate networks has been studied. Under
the assumption of link independence the problem breaks down into separate single
link problems. The Markov Decision Process approach has been applied, calls for
the calculation of link shadow prices. Though these can, in principle, be solved
from Howard equations the size of the state space of a realistic system is
prohibitive. The approximate approach by Krishnan and Hübner has been used as
a starting point. The method has been viewed from new angles and has enabled
introducing improvements. The KH method can been seen as the aggregation step
in the aggregation-disaggregation method, which suggests applying the
disaggregation step as well. On the other hand, the KH method can be viewed as a
way of approximating the state value function. Better approximations can be
obtained by other piecewise polynomial base functions. New recursive algorithms
have been devised for calculating the matrix elements needed in the normal
equations with such base functions. Most promising results were obtained with
piecewise linear base functions.
3.9
UseTraM - User Traffic Modelling for Future Mobile Systems
Project leader:
Researchers:
Jorma Virtamo
Jani Lakkakorpi
This project is a task in a larger project managed by the Telecommunications
Laboratory. A hierarchical model for the WWW traffic has been created based on the
extensive measurements by T. Nieminen. The model has been implemented for the
Network Simulator (ns-2) and has been used to analyse the performance of the
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wireless GPRS system. Latency times for page retrieval and end-to-end IP packet
delays with different loads have been studied by simulations.
3.10 Studies in queuing theory
Project leader:
Samuli Aalto
One topic was stochastic fluid queues, used in the modelling and performance analysis
of various telecommunication systems (such as ATM networks). The research related
to this topic was done in cooperation with W. Scheinhardt, a postdoc reasearcher in
Prof. Boxma's group. In particular, S. Aalto and W. Scheinhardt considered a tandem
fluid queue system with multiple consecutive buffers. As a result, they were able to
characterize the marginal content distribution of any buffer. In addition, they managed
to determine the correlation between two buffer contents. The results were reported in
EURANDOM's report series. A manuscript based on this report was also submitted to
a journal (OR Letters).
The other topic was the optimal control of batch service queueing systems. During the
visit, S. Aalto (partly) generalized the results that he had presented in his PhD Thesis.
The generalization related to the inclusion of the service costs: the former results were
merely based on the holding costs of customers. The results of these studies were also
reported in EURANDOM's report series. Moreover, the manuscript based on this
report has been accepted for publication in a journal (Mathematical Methods of
Operations Research).
3.11 IPANA / IP voice
Project leader:
Researcher:
Raimo Kantola
Jose Costa Requeña, Juho Haapala, Harri Marjamäki, Nicklas
Beijar, Inmaculada Espigares, Julio Raminez Yebenez
Voice over IP studies the transmission, switching and routing of voice in IP networks
and service interoperability of such networks with PSTN/ISDN. The project was
initiated in April 1997 and is planned to continue for three years. The project is mainly
funded by a TEKES grant, and it has four industrial partners (Nokia Research Center,
Nokia Telecommunications, Sonera Oy and Omnitele/Helsinki Telephone Research).
Results for the second year include Jose Costa Requeña’s M.Sc. thesis and conference
paper on the implementation of SCSP. Also Ms. Espigares finished her M.Sc. thesis.
In addition, one conference paper, internal reports and student papers were produced.
We also started the implementation of a routing testbed for the hybrid IP Voice Circuit switched network (SCN). The testbed uses the SCSP as a means to distribute
and synchronise routing information in Location Servers that may reside either on the
IP Voice network side or on the SCN side. The implementation is based on the
MySQL database and uses Python scripting for mapping data from the SCSP payload
to MySQL. The purpose of the testbed is to study the feasibility of automating service
management in the hybrid network and provide seamless number portability as a byproduct.
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Fig. 6. Routing Information protocols in the hybrid IP/SCN network.
3.12 IPANA / IP switching
Project leader:
Researchers:
Raimo Kantola
Mika Ilvesmäki, Veikko Brax, Anna-Kaisa Lindfors, Kimmo
Pitkäniemi, Peng Zhang, Zhangsong Ma, Sampo Kaikkonen
The project was initiated in April 1997 and is planned to continue for 3 years ending
in summer 2000. The project is mainly funded by a TEKES grant; it has four
industrial partners (Nokia Telecommunications, Sonera Oy and Omnitele/Helsinki
Telephone Research).
Although viewed as the prototype of the future Information Superhighway, the current
Internet technology has a number of drawbacks, including: limited transmission and
routing capacity, limited speed, long and variable transmission delays and no support
for quality of service. The project is aimed at helping to solve some of these problems
by focusing on issues of deployment of ATM to increase the performance of the
Internet and to improve the quality of service available to the user.
Besides technology evaluation the most important results in the project are based on
using neural algorithms for Internet traffic classification and applying the
classification results for boosting the network performance and perceived quality of
service.
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Packet Capture
Timeout
- Timestamp
- IP header
- TCP ports
Flow Analysis
- Application/#Pkt/#Flw
Classifier
Classifier
Teaching samples
- Decision logic
The NSP
Fig. 7: Methodology to analyse and classify traffic measurements in the Internet.
A new topic of class based routing was started in the IP switching subproject. The
purpose is to study the feasibility and usefulness of using constrained based or class
based routing in an IP switched network built using Multiprotocol Label Switching
and Differentiated Services. The first results were an internal report on the subject and
the development of the first version of a Quality of Service Routing Simulator. This
simulator supports the analysis of routing concepts in a flow based IP network.
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4 TEACHING
4.1
Development of teaching
The major in Telecommunications Technology was split in two parts, resulting in a
new major in Teletraffic Theory.
The course “Introduction to teletraffic theory” (S-38.145) was given both in Finnish
(spring term) and in English (fall term). The English version of the course was
produced specifically for the Master’s Programme started in fall 1999.
The book "Tietoliikenneaapinen" (The ABC of Telecommunications) by Seppo
Uusitupa and Kirsi Voipio was published in the beginning of year 1999. This book is
being used as the basis for the course “Principles in communication engineering” (S38.105).
The course ”Broadband switching technology” (S-38.164) was partly renewed;
besides the section on ATM technology, sections on IP switching and optical
networking technology were included in the course. The latter part was lectured by a
group of experts from Nokia Research Center.
Efforts were directed to improve the material of many other courses and to increase
the amount of material available through the web.
4.2
Courses
The laboratory has given education in 26 courses. The courses can be divided into 7
groups:
4.2.1 Basic courses for all students studying telecommunications
S-38.105 Principles in Communication Engineering (Tietoliikennetekniikan perusteet)
S-38.118 Principles in Telecommunications Technology (Teletekniikan perusteet)
4.2.2 Courses concerning communications and networks
S-38.188 Telecommunication Networks (Tietoliikenneverkot)
S-38.191 Corporate Networks (Televerkot yrityksissä)
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4.2.3 Courses on switching and ATM
S-38.110 Telecommunication Switching Technology I (Tiedonvälitystekniikka I)
S-38.122 Telecommunication Switching Technology II (Tiedonvälitystekniikka II)
S-38.164 Broadband Switching Technology (Laajakaistainen välitystekniikka)
S-38.166 Programming of Telecommunication Switching Systems
(Televälitysjärjestelmien ohjelmointi)
4.2.4 Courses on signal processing
S-38.211 Signal Processing in Telecommunications I
(Signaalinkäsittely tietoliikenteessä I)
S-38.212 Signal Processing in Telecommunications II
(Signaalinkäsittely tietoliikenteessä II)
4.2.5 Postgraduate courses
S-38.001 Telecommunications Forum (Telecommunications Forum)
S-38.130 Postgraduate Course in Telecommunications (Teletekniikan lisensiaattikurssi)
S-38.141 Teletraffic Theory (Teleliikenneteoria)
S-38.143 Queueing Theory (Jonoteoria)
S-38.149 Postgraduate Course in Teletraffic Theory (Teleliikenneteorian lisensiaattikurssi)
S-38.200 Individual Course in Telecommunications (Teletekniikan yksilöllinen opintojakso)
S-38.220 Licentiate Course in Signal Processing in Communications
(Tietoliikenteen signaalinkäsittelyn lisensiaattikurssi)
S-38.350 Research Seminar on Telecommunications Technology
(Teletekniikan tutkijaseminaari)
4.2.6 Courses on teletraffic theory
S-38.145 Introduction to Teletraffic Theory (Liikenneteorian perusteet)
S-38.147 Simulation of Telecommunication networks (Televerkkojen simulointi)
4.2.7 Other courses
S-38.117 Seminar on Telecommunications Technology (Teletekniikan seminaari)
S-38.123 Telecommunications Technology, laboratory course I
(Teletekniikan laboratoriotyöt I)
S-38.124 Telecommunications Technology, laboratory course II (Teletekniikan
laboratoriotyöt II)
S-38.128 Telecommunications Technology, special assignment
(Teletekniikan erikoistyö)
S-38.202 Telecommunications Engineering Project (Teletekniikan projektityö)
S-38.300 Thesis Seminar on Telecommunications Technology
(Teletekniikan diplomityöseminaari)
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4.3
Degrees
4.3.1 Licentiate of Technology
Pasi Lassila: Efficient simulation techniques for multiservice loss systems
On the call scale, the process describing the number of calls present in a network can
be modeled by a loss system. In principle, loss systems are mathematically simple and
well understood, and one is able to write down exact expressions for such variables as
the blocking probability of a call belonging to a given class. However, for systems of
realistic size such analytical expressions defy a direct evaluation because of the huge
size of the state space.
In such situations, one has to resort to simulations in order to obtain estimates of the
performance measures of interest. To this end, some basic simulation methods
(traditional MC, process simulation, Gibbs sampler) are considered and it is shown
how they are applied for generating samples in the simulation of loss systems. Then
the problem of increasing the efficiency of the simulations is addressed by using so
called variance reduction techniques. In particular, two different methods for
estimating the blocking probabilities in a multiservice loss system are presented. The
first method is based on the importance sampling method and utilizes some large
deviation results for multidimensional random variables. The second method is based
on another known method called conditional expectations method, where the idea is to
utilize known analytical results to the maximum degree.
Petri Karttunen. Adaptive algorithms for tracking direction-of-arrival in mobile
communications systems
One way to significantly increase the capacity of the third-generation mobile
communications systems is to employ adaptive antenna array technologies together
with sophisticated signal processing algorithms. For the Direction-of-Arrival (DOA)
based applications the classical beamformers and spatial spectrum estimation methods
can be utilized for the estimation of DOA of mobile users mainly in stationary signal
scenarios. Due to the time-varying nature of communications channels the focus of
this licentiate thesis was directed towards the development of adaptive DOA tracking
methods targeting at non-stationary signal scenarios.
4.3.2 Masters of Science in Telecommunication technology
Alden, B.
Producing test applications to fulfil the test requirements NTC
of internal services in a telecommunication systems, in
Finnish (Testisovellusten tuottaminen
sisäisten palvelujen testaustarpeisiin)
Autere, V.
Borgström, M.
televälitysjärjestelmän
Charging data collection of subscriber generated IP SIE
traffic, in Finnish (Tilaajaliittymien IP-liikenteen laskenta)
Application of the charging procedure in Finland’s SIE
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telecommunication network , in Finnish (Veloitusprotokollan
soveltaminen Suomen televerkkoon)
Espigares del Pozo, I. An Implementation of the Internet Call Waiting Service HUT
using SIP
Gerdt, L.
Quality of service in fast Ethernet networks, in Finnish Compaq
Haapasaari, M
Halme, M.
Holmberg, M.
(Palvelunlaatu nopeassa Ethernet-verkossa)
Charging of VoIP services, in Finnish (IP-puhepalvelun
laskenta)
NTC
Feasibility of ip transport in universal terrestrial radio NTC
access network
An open application environment for a vehicle Commit
computer, in Finnish (Avoin sovellusympäristö ajoneuvotietokoneissa)
Höneisen, B.
Insa Hernàndez, R.
Jantunen, T.
Jussila, J.
Convergence of Internet and Intelligent Networks:
Interaction of services using PINT
Implementation of Gram-Schmidt Conjugate Directions
and Conjugate Gradients Algorithms
Impacts of Internet protocol on PBX evolution and
corporate remote access
Applying object oriented methods in building layered
software, in Finnish (Oliomenetelmien soveltaminen
NRC
HUT
SIE
NTC
kerroksellisen ohjelmiston koonnissa)
Kaikkonen, J.
Kaplas, M.
Role of measurements in process improvement – An TE
internet tool for tracking progress of software
development projects
The use of narrowband network tests in broadband SON
network testing, in Finnish (Kapeakaistaverkon testien
soveltaminen
laajakaistaverkon testauksessa)
Kyheröinen, P.
Kyrönaho, J.
Lakkakorpi, J.
Mahkonen, M.
Transition to Internet Protocol version 6: Teleoperator´s
view
Interworking in an IP telephony gateway
Traffic Modeling and Simulation in Wireless
Environment
Handover in Actionet, in Finnish (Solujen välinen
HPY
NTC
HUT
HUT
kanavanvaihto Actionet-järjestelmässä)
Mattila, T.
Applying the CAMEL architecture to the international SON
GSM network, in Finnish (CAMEL-ominaisuuden sovitus
Mikkola, M.
An ISDN based DECT nurse call system, in Finnish Sondi
kansainväliseen GSM-verkkoon)
(ISDN-tekniikalla toteutettu DECT-hoitajakutsujärjestelmä)
Myöhänen, J.
Mäittälä, M.
Mäntylä, H.
Niemi, T.
Planning of field validation for an SDH cross-connect TE
system
Voice over IP in ADSL Access Networks
Nokia
Networks
Design of Very high speed Digital Subscriber Line HUT
(VDSL) networks
Application development methods for Interactive Voice Arts
&
Response,
in
Finnish
(Ääniautomatiikka-sovellusten Minds
ohjelmointimenetelmien kehittäminen)
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Nurmi, P.
Computer telephony application programming interface NTC
technologies and their evolution, in Finnish (Tietokonepuhelinsovellusrajapintateknologiat ja niiden kehitys)
Nyberg, E.
Nyberg, S.
Calculation of Blocking Probabilities and Dimensioning HUT
of Multicast Networks
An infrastructure for administration of information AB
technology in enterprises, in Swedish (En infrastruktur för
administration av informationsteknologi I företag)
Ohtonen, P.
Management of UMTS –radio access transmission, in NTC
Finnish (UMTS-liityntäverkon siirtoverkon hallinta)
Pajakkala, M.
Pyyhtiä, M.
Core processors in networking asics
TE
Differentiated Qos in heterogenous IP networks, in HPY
Pyyppönen, M.
Technical implementation of the GPS to the existing HPY
GSM cellular network, in Finnish (GPRS:n tekninen toteutus
Finnish (Palvelun laatu heterogeenisissä IP-verkoissa)
olemassa olevaan GSM-solukkoverkkoon)
Rainola, R.
Roine, T.
Romppanen, A.
Räsänen, M.
Comparison
of
Synchronization
Methods
Synchronous Digital Hierarchy (SDH)
The performance model of an IN prepay solution
End-to-end Quality of Service in Internet Telephony
in NTC
ICL
Nokia
Networks
Integration of the broadband UDSL-subscriber access in SIE
the switching system, in Finnish (Laajakaistaisten USDLtilaajaliittymien integrointi puhelinkeskusjärjestelmään)
Saunamäki, J.
Implementation of user and network signalling for an NRC
ATM-switch, in Finnish (Tilaaja- ja verkkomerkinannon
Sipilä, J.
Application of external intelligent peripherals to mobile SIE
networks
Transfering the remote patient monitoring data in real- Datextime in a packet-switched network, in Finnish (Potilaan Ohmeda
toteuttaminen ATM-kytkimeen)
Solehmainen, K.
etämonitorointitiedon reaaliaikainen välitys pakettiverkossa)
Suni, M.
Sytelä, T.
Measurement-based connection admission control
NTC
Management of Subscriber specific intelligent network SON
services, in Finnish (Tilaajakohtaisten älyverkkopalveluiden
hallinta)
Toppila, P.
Torpo, J.
Wall; J.
Wallenius, N.
Visti, H.
Quality of Service in UMTS Based Internet Access
Accuracy of Charging in a Fixed Switching Center
Java Based Agents as Secure Proxies
Secure communication between corporate networks and
mobile users gprs packet radio network
Re-engineering of network in Helsinki Stock Exchange,
in Finnish (Helsingin Pörssin tietoliikenneverkon uudistaminen)
27
LME
NTC
LME
SON
HEX Oy
The Laboratory of Telecommunications Technology
Annual Report 1999
AB
HPY
HUT
ICL
LME
NRC
NTC
NTW
SIE
SON
TE
Alfred Berg Finland
Helsinki Telephone Company
Helsinki Univ. of Technology/ Lab. of Telecom. Technology
Fujitsu-ICL Computers
Oy L M Ericsson Ab
Nokia Research Center
Nokia Telecommunications
Nokia Networks
Siemens Finland
Sonera
Tellabs Oy
LME
Others
NRC
NTW
HPY
TE
NTC
SON
SIE
HUT
Fig. 8. Employers of Masters students.
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5 ACTIVITIES
5.1
•
International conferences and meetings
COST 257 Mid-term Seminar and Management Committee meeting, January 2022, 1999, Vilamoura (Lassila, Virtamo)
• COST 263 Management Committee meeting, January 29-31, 1999, Brussels,
Belgium (Luoma)
• IEEE International Conference on Acoustics, Speech and Signal Processing
(ICASSP`99), March 15-19, Phoenix, Arizona, USA (Laakso)
• COST 263 Management Committee meeting, April 15-18, 1999, Naples, Italy
(Peuhkuri)
• Vehicular Technology Conference, May 16-19, 1999, Houston, Texas (Kettunen)
• IEEE Finnish Signal Processing Symposium, FINSIG`99, May 1999, Oulu
(Baghaie, Insa, Karttunen, Liu, Mäntylä)
• Pallas Fractal Symposium, May 5-7, 1999, Muonio (Sharma, Vidács, Virtamo)
•
Master’s Programme in Telecommunications visit to China May 9-17, 1999,
(Kantola)
•
COST 257 Management Committee meeting, May 17-18, 1999, Warsaw
(Virtamo)
•
VON Conference, June 22 - 24, 1999, Helsinki (Kantola, Costa Requena)
• 16th International Teletraffic Congress, June 7-11, 1999, Edinburgh, United
Kingdom (Aalto, Lassila, Virtamo)
• International Conference on Communications, June 6-10, 1999, Vancouver,
Canada (Laakso)
• 45th IETF Meeting, 11-16 July, 1999, Oslo, Norway (Luoma)
• 42nd Midwest Symposium on Circuits and Systems, August 8-11, 1999, New
Mexico, USA (Baghaie)
•
Lappenranta Summer School on Telecommunications, August 11, 1999 (Kantola invited talk on Voice over IP)
• IFIP WG6.3 Workshop, August 30 - September 1, 1999 Rethymnon, Greece
(Virtamo)
• Sigcomm´99 Conference,
(Peuhkuri)
August 30 – September 4, 1999, Boston, USA
• 5th Bayona Workshop on Emerging Technologies in Telecommunications, 6-8
September, 1999, Bayona, Spain (Liu)
• The 10th International Symposium on Personal, Indoor and Mobile Radio
Communications, September 12-15, 1999, Osaka, Japan (Karttunen)
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• COST 257 Management Committee meeting, Larnaca, Cyprus (Aalto)
• International Conference on Voice, Video and Data Communications, September
21-22, 1999, Boston, USA (Ilvesmäki, Kantola, Luoma, Requena)
• COST 263 Management Committee meeting, October 5-6, 1999, Barcelona, Spain
(Luoma)
• Asilomar Conference on Signals, Systems and Computers, October, 1999, Pacific
Grove, CA, USA (Baghaie)
• IEEE Globecom`99, December 5-9, 1999, Rio de Janeiro, Brazil (Baghaie, Laakso,
Werner)
• Erasmus student exchange experience meeting at Ecole Francaise D`Electronique
et D`Informatique (EFREI) , Paris (Kantola)
• Visit to Universidade Federal do Rio de Janeiro, Brazil, December 10, 1999
(Baghaie, Laakso)
• Media Gateway Control Conference 99, December 15-17, 1999, Paris, France
(Kantola – invited talk on Voice over IP)
5.2
Foreign visitors in 1999
The following persons have visited the Laboratory of Telecommunications
Technology during the year 1999:
•
Professor Paulo Diniz from Universidade Federal do Rio de Janeiro, Brazil (July September 1999)
•
Ms. Inmaculada Espigares from Universidad Politecnica de Valencia
•
Mr. Ricardo Insa Hernandez from Universidad Politecnica de Valencia (October
1998 - July 1999)
•
Mr. Attila Vidács from Technical University of Budapest (September 1998 – May
1999)
•
Professor Vinod Sharma from Indian Institute of Science, Bangalore (September
1998 - July 1999)
•
Dr. Oliver Rose from University of Wuerzburg (August, 1999)
•
Mr. Julio Raminez Yebenes from Spain (from November 1999)
•
Professor Gerald D. Cain from University of Westminster London, (November,
1999)
•
Ph.D. Izzet Kale from University of Westminster London (November, 1999)
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6 PARTICIPATION IN BOARDS AND COMMITTEES
6.1
University boards and committees
• Raimo Kantola
− Director of the Master’s Programme in Telecommunications
− Member of Council of Degree Programme
− Member of the working group on the new structure of basic and option
studies.
• Timo Laakso
− Chairman of the Library Committee of the Department of Electrical and
Communications Engineering
• Jorma Virtamo
− Vice chairman of the Committee for the International Affairs
6.2 Other boards and committees
• Ramin Baghaie
− Member of Technical Committee of European Signal Processing
Conference, EUSIPCO`00, Tampere, Finland
− Session chairman, IEEE Finnish
FINSIG´99, Oulu, Finland, May 1999
Signal
Processing
Symposium,
− Session Chairman, IEEE Midwest Symposium on Circuits and Systems,
Las Cruces, New Mexico, USA, August 1999
− Member of Technical Program Committee of IEEE Finnish Signal
Processing Symposium, FINSIG`99, Oulu, Finland, May 1999
− Treasurer of IEEE Finland Section
• Raimo Kantola
− Member of the Supervisory Council in Sonera Oyj
− Session chairman at the International Conference on Voice, Video and Data
Communications, Boston, USA, September 1999
• Timo Laakso
− Member of the Digital Signal Processing Technical Committee of the IEEE
Circuits and Systems Society
− Member of the editorial board of Applied Signal Processing (Journal by
Springer Verlag)
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The Laboratory of Telecommunications Technology
Annual Report 1999
• Jorma Virtamo
− Vice Chairman of the action COST 257 “Impacts of new services on the
architecture and performance of broadband networks”
− Member of the Technical Program Committee of the 16th International
Teletraffic Congress ITC-16, in Edinburgh, June 7-11, 1999
− Member of Technical Committee of the Conference Networking 2000
(IFIP-TC6), Paris, France, May 14-19, 2000
− Member of Technical Committee of ITC Specialist Seminar on Mobile
Systems and Mobility, Lillehammer, Norway, March 22-24, 2000
− Member of Technical Committee of 1st International Workshop on Quality
of Future Internet Services, QofIS, Berlin, Germany, September 15-16,
2000
− Member of the Board of the Research Foundation of Helsinki Telephone
Company
6.3 Referee activities
• Timo Laakso
− Reviewer for the following scientific journals: IEEE Transactions on Signal
Processing, IEEE Trans. on Circuits and Systems, IEEE Trans. on
Communications, Signal Processing, Applied Signal Processing, IEE
Electronic Letters
− External evaluator of the Dr.Tech. dissertation of Z. Hang, Tampere
University of Technology
• Jorma Virtamo
− Evaluation of associate professor Vinod Sharma for the position
professor, Indian Institute of Science, Bangalore, India
of
− Reviewer for the following scientific journals: IEEE Journal on Selected
Areas in Communications, IEEE/ACM Transactions on Networking,
Performance Evaluation
− Reviewer for the following conferences: Infocom 2000, ITC Specialist
Seminar on Mobile Systems and Mobility, Networking 2000
32
The Laboratory of Telecommunications Technology
Annual Report 1999
7 Publications
1. Aalto, S. Optimal control of batch service queues with finite service capacity and
linear holding costs. Eindhoven University of Technology: EURANDOM,
European Institute for Statistics, Probability, Operations Research and their
Applications, 1999. 18 p. (Eurandom Report 99-021 ).
2. Aalto, S. & Scheinhardt, W. Tandem fluid queues fed by homogeneous on-off
sources. Eindhoven University of Technology: EURANDOM, European Institute
for Statistics, Probability, Operations Research and their Applications, 1999. 13 p.
(Eurandom Report 99-022).
3. Baghaie, R. Application of transformation techniques in CDMA receivers. IEEE
Midwest Symposium on Circuits and Systems, Las Cruces, New Mexico, August
1999.
4. Baghaie, R. Systolic implementation of sample-by-sample conjugate gradient
algorithm. IEEE Finnish Signal Processing Symposium FINSIG´99, Oulu,
Finland, May 1999. Oulu, Finland 1999, University of Oulu, s. 252-256.
5. Baghaie, R. Transformation techniques in CDMA receivers, IEEE Finnish Signal
Processing Symposium FINSIGé99, Oulu, Finland, May 1999. Oulu, Finland
1999, University of Oulu, s. 10-15.
6. Baghaie, R.& Dimitrov, V. DHT algorithm based on encoding algebraic integers.
Electronics Letters, 1999. Vol. 35, nro 16, s. 1303-1305.
7. Baghaie, R. & Karttunen, P. Implementation of mobile user tracking system.
Global Telecommunications Conference GLOBECOM´99, Rio de Janeiro, Brazil,
December 5-9. s.2127-2131.
8. Baghaie, R. & Karttunen, P. VLSI implementation of CG based mobile user
tracking system. IEEE Midwest Symposium on Circuits and Systems, Las Cruces,
New Mexico, August 1999.
9. Costa Requena, J. & Kantola, R. Server Cache Synchronization Protocol (SCSP):
component for directory enabled networks. Internet II: Quality of Service and
Future Directions, Boston USA, 20-21 September. 1999, SPIE, s. 174-182.
10. Dimitrov, V. & Baghaie, R. Computing discrete Hartley transform using algebraic
integers. 33rd Asilomar Conference on Signals, Systems and Computers, Pacific
Grove, CA, October 1999.
11. Helenius, J. & Liu, Y. & Renfors, M. & Laakso, T. Analysis of VDSL capacity
based on channel measurements. Broadband Access Conference BAC´99, Cracow,
Poland, October 11-13. s.160-166.
12. Hyytiä, E. & Virtamo J. Wavelength Assignment in multifiber networks.
COST257, 1999. 14 s.
13. Hänninen, A. Annual Report 1998. Espoo: Teknillinen korkeakoulu, 1999. 34 s.
(Teletekniikan laboratorion raporttisarja ).
33
The Laboratory of Telecommunications Technology
Annual Report 1999
14. Ilvesmäki, M. & Luoma, M. Performance Analysis of Multi-Class Internet Traffic
Classifier in a Connection Oriented Router Environment. Internet II: Quality of
Service and Future Directions, Boston, USA 20-21 September. 1999, SPIE, s. 7081.
15. Insa Hernandez, R., Baghaie, R. & Kettunen, K. Implementation of Gram-Schmidt
conjugate direction and conjugate gradient algorithms. IEEE Finnish Signal
Processing Symposium FINSIG´99, Oulu, Finland, May 1999. Oulu, Finland
1999, University of Oulu, s.165-169.
16. Karttunen, P. An algorithm for noise subspace based mobile user tracking.
International Symposium on Personal, Indoor and Mobile Radio Communications,
Osaka, Japan, September 1999. s. 651-655.
17. Karttunen, P. & Baghaie, R. Conjugate gradient based signal subspace mobile user
tracking. IEEE Vehicular Technology Conference, Houston, Texas, USA, May
1999. s. 1172-1176.
18. Karvo, J. & Aalto, S. Average Signalling Load for Multicast Group Management.
International Teletraffic Congress - ITC-16, United Kingdom, 7-11 June, 1999.
Elsevier 1999, pp. 509-518.
19. Kettunen, K. Iterative multiuser receiver/decoders with enhanced variance
estimation. IEEE 49th Vehicular Technology Conference, Houston, Texas, USA,
May 1999. pp 2318-2322.
20. Kettunen, K. Iterative multiuser receivers in coded CDMA systems. IEEE Finnish
Signal Processing Symposium FINSIG´99, Oulu, Finland, May 1999. Oulu 1999,
University of Oulu, s. 15-19.
21. Kettunen, K. & Laakso, T. Iterative multiuser receiver utilizing soft decoding
information. IEEE International Communications Conference, Vancouver, BC,
Canada, June 1999. s. 942-946.
22. Kilkki, K. Differentiated Services for the Internet. Indianapolis, USA 1999,
Macmillan Technical Publishing. 356 s.
23. Laakso, T. How to write a diploma thesis. Espoo 1999, Teknillinen korkeakoulu.
27 s.
24. Laakso, T. Näin kirjoitan diplomityön. Espoo 1999 , Teknillinen korkeakoulu. 27
s.
25. Laakso, T. & Välimäki, V. Energy-based effective length of the impulse response
of a recursive filter. IEEE Transactions on Instrumentation and Measurement,
1999. Vol. 48, nro 1, ss.7-17.
26. Lassila, P. Efficient simulation techniques for multiservice loss systems. Espoo:
Teknillinen korkeakoulu, Teletekniikan laboratorio, 1999. 97 s. (Teletekniikan
laboratorion raporttisarja 1/99).
27. Lassila, P. & Virtamo, J. Efficient Importance Sampling for Monte Carlo
Simulation of Loss Systems. International Teletraffic Congress - ITC-16, United
Kingdom, 7-11 June, 1999. Elsevier 1999, p. 787-796.
34
The Laboratory of Telecommunications Technology
Annual Report 1999
28. Liu, Y., Helenius, J., Laakso, T. & Renfors, M Capacity estimation of VDSL
Connections based on channel measurements. 1999 Finnish signal processing
symposium FINSIG´99, Oulu Finland, 31 May 1999. Oulu 1999, University of
Oulu, s.262-266.
29. Liu, Y., Laakso, T., Helenius. J. & Renfors, M. VDSL capacity estimation based
on in-field measurements. Fifth Baiona Workshop on Emerging Technologies in
Telecommunications, Baiona, Spain, September 1999. s. 37-41.
30. Luoma, M., Ilvesmäki, M. & Peuhkuri, M. Source Characteristcs for Traffic
Classification in Differentiated Services Type of Networks. Internet II: Quality of
Service and Future Directions, Boston USA, 20-21 September. 1999, SPIE, s. 2536.
31. Luoma, M., Ilvesmäki, M. & Peuhkuri, M. Use of packet lenght and inter-arrival
time for quality differentiation in differentiated services. Barcelona, Espanja:
1999. (COST263 TD 99/03/03).
32. Marjamäki, H. & Kantola, R. Performance evaluation of an IP voice terminal. IFIP
TC6 WG6. 7 Fifth International Conference on Intelligence in Networks
(SMARTNET'99), Pathumthani, Thailand, November 22-26. s. 349-362.
33. Mäntylä, H. Design of very high speed digital subscriber line (VDSL) networks.
Espoo: Teknillinen korkeakoulu Teletekniikan laboratorio, 1999. 73 s.
(Teknillinen korkeakoulu Teletekniikan laboratorion raportti 4/99).
34. Mäntylä, H., Poikolainen, P. & Laakso, T. Design of very high speed digital
subscriber line (VDSL) networks. IEEE Finnish Signal Processing Symposium
FINSIG´99, Oulu Finland, May 1999. Oulu, Finland 1999, University of Oulu, s.
257-261.
35. Norros, I., Valkeila, E. & Virtamo, J. An elementary approach to a Girsanov
formula and other analytical results on fractional Brownian motions. Bernoulli,
1999. Nro 5(4), s. 571-587.
36. Nyberg, E. Calculation of blocking probabilities and dimensioning of multicast
networks. Espoo: Teknillinen korkeakoulu, Teletekniikan laboratorio, 1999. 84 s.
(Teletekniikan laboratorion raporttisarja 5/99).
37. Nyberg, E., Virtamo, J. & Aalto, S. An Exact Algorithm for Calculating Blocking
Probabilities in Multicast Networks. Espoo: 1999. 15 s. (COST257 TD(99)26).
38. Reguena Costa, J. An implementation of the server cache synchronisation protocol
(SCSP). Espoo: Teknillinen korkeakoulu, Teletekniikan laboratorio, 1999. 71 s.
(Teknillinen korkeakoulu Teletekniikan laboratorio raporttisarja 2/99).
39. Sharma, V. & Virtamo, J. A Finite Buffer Queue. Global Telecommunications
Conference GLOBECOM´99, Rio de Janeiro, Brazil, December 5-9. s.1053-1057.
40. Vidács, A. & Virtamo, J. Maximum likelihood estimation of the parameters of
fractional brownian traffic with geometrical sampling. IFIP TC6 WG6.2 Fifth
International Conference on Broadband Communications (BC´99), Hong Kong,
November 10-12. Boston 1999, s. 51-62.
35
The Laboratory of Telecommunications Technology
Annual Report 1999
41. Vidács, A. & Virtamo, J. ML Estimation of the Parameters of FBM with
Geometrical Sampling. COST257, 1999. 15 s.
42. Vidács, A. & Virtamo, J. Time Domain MLE of the Parameters of FBM Traffic.
Espoo: Teknillinen korkeakoulu, 1999. 30 s. (Teletekniikan laboratorion
raporttisarja 3/99).
43. Voipio, K. ADSL haastaa ISDN:n. Tietokone, 1999. Vol. 18, nro 4, s. 95-96.
44. Voipio, K. BLUETOOTH pikaverkkoja johdottomasti. Tietokone, 1999. Vol. 18,
nro 10, s. 95-97.
45. Voipio, K. & Uusitupa, S. Tietoliikenneaapinen.
Yliopistokustannus / Otatieto. 188 s.
36
Tampere
1999,
Oy
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