TKK | Tietoverkkolaboratorio | Julkaisut
A new team entered. Dr. Timo Laakso started in his post in August with signal processing in communications as the field of research and teaching. Dr. Raimo Kantola started as acting professor, responsible for switching systems and industrial co-operation. Dr. Jorma Virtamo started in his post, defined as broadband multiservice networks and their traffic theory, only in January 1997, but he took an active part in the planning of future teaching and research already in the fall 1996. Along with these changes, also new research positions have been granted to the laboratory. With all the new resources and the excellent existing staff the laboratory is well prepared for new challenges.
The next few years will be busy in establishing a new curriculum and research group for the enlarged part of the field of telecommunications that the laboratory is now responsible for. Co-operation with other laboratories in the Department of Electrical Engineering and Communications will be important. Contacts to the communications industry as well to the international research community will be essential.
The Laboratory of Telecommunications Technology is in transition, which means changes in both teaching and research activities of the laboratory.
The main effort in the near future is the planning of the new curricula for various branches of telecommunications together with Telecommunications Laboratory. The goal is to create a set of good basic courses which give a good overview of different aspects of telecommunications transmission and networks and attracts students to this important field. This should be followed by a solid set of courses that focus on details and recent developments with as little overlap as possible. This requires cooperation and coordination.
The research is in a very active phase and growing fast. The main fields of research are the traffic modelling and management in ATM networks, switching and speech transmission in Internet networks, and adaptive antennas for future mobile communication networks.
Laboratory of Telecommunications Technology has a networking infrastructure which consists of three switches and peripheral equipment. The building of the network started in 1994 when the department decided to fund the development project of our laboratory. Since then, several research projects have used this network for ATM research.
1.2 Teaching area
Laboratory of Telecommunications Technology has been one of the greatest laboratories in the Department of Electrical Engineering when compared by the number of graduated students. Total of 43 new Masters of Science graduated in the laboratory 1996. The popularity of our technical area challenges our teaching staff to achieve again and again the high level set by telecommunication industry.
Our courses have been very popular among students of Department of Electrical Engineering but also many students from other departments have chosen Telecommunication Technology as their minor subject. The students seem to have been satisfied with their education because our courses and teachers have achieved above average grades from student's course evaluations.
Laboratory has been lucky to have many part-time teachers from outside the university. With their knowledge we have been able to give updated and modern education to our students. It is our hope that the good co-operation with Finnish industry will continue in future years!
2.1 Laboratory staff
|Timo Laakso||Dr.Tech., professor, head of laboratory|
|Raimo Kantola||Dr.Tech., acting professor (1.9.1996-)|
|Seppo Ovaska||Dr.Tech., acting professor (until 1.8.1996)|
|Jorma Virtamo||Dr.Tech., professor (1.1.1997 - )|
|Kauko Rahko||Dr.Tech., professor emeritus|
|Mika Ilvesmäki||M.Sc., Teaching assistant|
|Jukka Nurmi||Teaching assistant|
|Markus Peuhkuri||Teaching assistant|
|Xiao Ming Gao||PhD, research scientist|
|Taneli Harju||MSc, research scientist|
|Janne Kankare||MSc, research scientist|
|Hanna Karjalainen||Research assistant|
|Petri Karttunen||MSc, research scientist|
|Kalevi Kilkki||Dr. Tech., research scientist|
|Marko Luoma||MSc, research scientist|
|Markku Nikkola||Lic.Tech. (PhD), senior engineer until 1.5.96|
|Stefan Werner||Research assistant|
|Tomi Yletyinen||Research assistant|
|Seppo Uusitupa||Lic. Tech. (PhD), senior engineer|
|Arja Hänninen||Department secretary|
|Esko Nupponen||Senior laboratory supervisor|
(Image missing so far)
Front from left: Nupponen, Kantola, Virtamo, Hänninen, Laakso
Back from left: Karttunen, Hyytiä, Peuhkuri, Werner, Yletyinen, Ilvesmäki, Nurmi, Lassila, Luoma
2.2 Part-time teachers & assistants
|Huhta-Koivisto, Risto||S-38.189||Telecommunication networks|
|Isola, Olli-Pekka||S-38.113||Principles in Electrical Communication Eng.|
|Karvinen, Atte||S-38.166||Programming of Telecommunication Switching Systems|
|Signal Processing in Telecommunications I|
Signal Processors in Telecommunications
|Mertanen, Pauli||S-38.123||Telecommunications Technology, laboratory course|
|Renko, Jari||S-38.175||Local Area Networks|
|Roos, Mikael||S-38.183||Office Automation|
|Salminen, Mikko||S-38.189||Telecommunication Networks|
|Svinhufvud, Jaakko||S-38.191||Corporate Networks|
|Heiskanen, Mikko||Hämäläinen, Mika||Jokela, Petteri|
|Jäppinen, Ilkka||Jääskeläinen, Kari||Kalervo, Matti|
|Kantola, Vesa||Karjalainen, Janne||Kerttula, Esa|
|Koskenheimo, Pekka||Kosola, Jyri||Kuivalahti, Tatu|
|Laamanen, Heikki||Laine, Jyrki||Lallo, Pauli|
|Nyberg, Kaisa||Oja, Juha||Pursiainen, Harri|
|Salminen, Esa||Salo, Ari||Salo, Tommi|
|Sieppi, Jukka||Simula, Timo||Soramäki, Martti|
|Svensson, Reijo||Tanskanen, Jarno||Timonen, Jukka-Pekka|
|Visuri, Petri||Ylä-Jääski, Antti|
Several applications of the ATM technology in switching and relaying the internet traffic are studied in this work including IP over ATM, ATM Forum LAN emulation and IP switching. The applicability of these techniques is resolved through traffic measurements of real computer networks of different magnitude. Measurements show that traffic and service profiles in the internet are heavily dependent on the size of the network, the habits of the users and the applications used. Measurements indicate that the workload of routers decreases over 50 % if IP-switching is used.
The principle of IP switching
On the other hand the identification, classification and the switching criteria of a traffic flow, or an IP flow, should be further studied to enable the use of IP switching in different kinds of networks. Also the interoperability between IP switching equipment and other network components requires special attention.
3.2 Models for Integrated Telecommunication network Traffic and Architecture
Project leader: Rahko, Kauko
Other researchers: Kilkki, Kalevi; Vidacs, Attila; Luoma, Marko; Kankare, Janne; Peuhkuri, Markus
In this research the key issue is the traffic management in ATM networks. The aim is to find out which are the key factors in the effective traffic management and how they should be adjusted in order to minimise the load of the traffic management. On the area of buffer management, the use of real time traffic measurements for predicting short term traffic fluctuations are studied. This research is carried out through simulations using commercial tools as well as specifically developed programs. Connection admission control and its necessity are studied by adopting genetic algorithms. The goal is to optimise required algorithms so that they suit for real-time calculations. This project is funded by the Academy of Finland.
3.3 Subjective testing of quality of video services in ATM network
Project leader: Kilkki, Kalevi
Other researchers: Karjalainen, Hanna; Peuhkuri, Markus
In this research the main point is to examine how the quality of video services in ATM networks behaves in respect to Quality of Service parameters. When considering interactive services such as videoconferencing one must be careful with delay and delay variation in networks. In the case of non-interactive services, troubles caused by delay variations are easily managed with buffering as the receiving end. How cell loss ratio affects to the quality of video service depends on the coding used: one must take into account compression algorithm, used packets and error correction. Other requirements one sets to a network in case of video services are low bit error ratio, sufficient bandwidth, and effective handling of multicasting. This research studies in particular the impact of cell losses to the quality of VoD type of service coded with MJPEG. This is done with subjective testing: 20 people participated in these tests. The parameters used in testing were not only cell loss ratio but also distribution of cell loss process, which had considerable effect on the perceived quality.
3.4 Smart antennas in new radio systems
Project leader: Laakso, Timo (until 31.7.96 Seppo Ovaska)
Other researchers: Karttunen, Petri; Werner, Stefan
In this project, digital signal processing for smart antenna systems is investigated. The main goal is to develop efficient digital beamforming algorithms for both the base station and the mobile user of a mobile communication system. This is a subproject of MAST, a research project of Institute of Radio Communications (IRC) which focuses on the new technologies in mobile communication systems. The research is funded by Technological Development Center (TEKES), NOKIA Research Center, Telecom Finland and Helsinki Telephone Company.
3.5 Fuzzy and neural power controllers
Project leader: Ovaska, Seppo
Other researchers: Gao Xiao Ming
The investigation of neural network based nonlinear power prediction methods in the control systems have been carried out extensively in the first half of 1996. Due to the high nonstationarity and nonlinearity of the received power signals in the mobile communication system, it is advantageous to use a nonlinear predictor with on-line adaptation. Our experiments show that the neural network based methods can outperform conventional linear schemes. The accurate power prediction is used as an indispensable part of the neuro-fuzzy controller. In the latter half of 1996, the emphasis is on developing advanced power control strategies for mobile communication systems.
3.6 World Wide Web based digital filter design automation
Project leader: Harju, Taneli
World-Wide-Web (WWW) technology is used mainly to produce interactive and passive applications for information browsing and retrieval. However, this technology enables offering computationally oriented services as well. The main benefit of such applications is that no installation of software is required on the client side, but the program is used via the WWW browser software. Furthermore, most of the computational burden is moved to the server side, and no software updates or purchases are necessary on the client side. The service provider benefits by not having to deliver software updates to customers, which enables incremental product development cycles, the possibility of true pay-per-use, elimination of the delivery channel, and a large potential customer base. In this study, an application for the design and visualization of digital filters has been designed and implemented as an example of a WWW-based client/server system. The aim of the study is to accumulate practical experiences of implementing WWW-based computer aided design (CAD) software systems.
The laboratory has given education in 25 courses. The courses can be divided in 6 groups:
4.1.1 Basic courses for all students studying
|Arte, T.||Trunk circuit testing, in Finnish (Yhdysjohtojen testaus)||NTC|
|Grönberg, S.||Suitability of multimode technologies for producting mobile telecommunications services, in Finnish (Yhdistelmäteknologioiden soveltuvuus matkapuhelinpalvelujen tuottamiseen)||TELE|
|Hakaste, M.||Protocol modifications in GSM for high speed circuit switched data||NRC|
|Heinäharju, P.||The planning of fixed radio access network to the existing telecommunication network, in Finnish (Kiinteän radioliityntäverkon suunnittelu olevaan televerkkoon)||TELE|
|Hellman, J.||The Impact of IN on Traffic in the GSM Network||NTC|
|Holmberg, A.||Interconnecting telecommunication networks and customer information systems||TELE|
|Ilvesmäki, M.||The use of ATM technology in switching of internet traffic, in Finnish (ATM-tekniikan käyttö internet-liikenteen välityksessä)||HUT|
|Jarre, P||Implementation of unit protection in a SDH mode, in Finnish (SDH-solmun yksikkövarmennuksen toteutus)||NTC|
|Jernström, E.||Inelligent control functions for B-ISDN services||HTC|
|Juntunen, J.||Initialization of managed objects in the network management system, in Finnish (Hallittavien olioiden alustaminen tietoliikenneverkon hallinta-järjestelmässä)||NTC|
|Järvinen, M.||Charging of Telephone Calls in Tele’s Trunk Network, in Finnish (Puhelun veloitus Telen runkoverkossa)||TELE|
|Karjalainen, J.||Computer Telephony Integration||NTC|
|Kilpeläinen, A.||Specification development and testing of the access signalling protocol of the ISDN, in Finnish (ISDN-liittymämerkinannon spesifikaatiokehitys ja testaus)||TELE|
|Kyntöjärvi, J.||Market research and feasibility analysis of a service creation environment||TM|
|Kätkä, A.||Applying the Capability Set 2 (CS2) I the operator’s network, in Finnish(Älyverkon CS2-ominaisuuskokoelman soveltaminen operaattorin verkkoon)||TELE|
|Laakso, J.P.||Planning methods and tools for intelligent underlay-overlay networks||NRC|
|Lahtinen, S.||Multimedia traffic management in ATM networks, in Finnish (Multimedialiikenteen hallinta ATM-verkossa)||TELE|
|Lamminluoto, M.||Internet and it’s commercial adaptation, in Finnish (Internet-verkko ja sen kaupallinen soveltaminen)||ICL|
|Lautanala, J.||Service Management in the interactive digital video service, in Finnish(Palvelun hallinta interaktiivisessa digitaalisessa video-palveluverkossa)||TELE|
|Lavonen, T||Testing of the switching systems from the point of view of telecommunications operator, in Finnish (Keskusjärjestelmän testaus teleoperaattorin kannalta)||TELE|
|Le,T.D.||The implementation of a directory service and connections to applications using X.500 technology, in Finnish (Hakemistopalvelun toteutus ja liitännät sovelluksiin X.500-tekniikalla)||TELE|
|Lehmus, M-L||Feasibility of the new GSM data services from the technical and the economical perspective, in Finnish(Eräiden uusien GSM-datapalveluiden toteutettavuus tekniseltä ja kaupalliselta näkökannalta)||TELE|
|Liikanen, J.||Improving information flow in a company with groupware based on distributed databases||FI|
|Loukos, K.||B- and N-ISDN signalling and network interworking, in Finnish (B- ja N-ISDN-merkinantojen ja -verkkojen yhteistoiminta),||NTC|
|Luntta, J.||Incremental Design According to Cleanroom Method Applied to AXE10 Software Development||LME|
|Luoma, M.||Performance measurements of ATM switching systems, in Finnish(ATM-kytkentäkenttien suorituskyvyn mittaus)||HUT|
|Martikainen, M.||Analysis of the French telematics - business opportunities for GSM data services||NMP|
|Nousiainen; T.||Improving mobile services through intelligent network functionality||SIE|
|Palo, M.||Management of Video-on-Demand, in Finnish (Tilausvideopalvelun hallinta)||NTC|
|Passinen, J.||Network management of a Mobile Network and the Network Management Protocols, in Finnish (Erään matkapuhelinverkon hallinta sekä hallintaprotokollat)||SIE|
|Pitkänen, A.||The management of the configuration parameters in voice messaging system by initialisation file based method||TM|
|Pulliainen, P||Centralizing attendant service in a corporate network, in Finnish (Puhelunvälityspalveluiden keskittäminen yhtymäverkossa)||TELE|
|Raij, T.||Interactive digital videoservice and it`s implementation, in Finnish (Interaktiivinen digitaalinen videopalvelu ja sen toteutus)||TELE|
|Rauhala, K.||ATM handover in cellular network, Nokia Researct Center||NRC|
|Remes, T.||Execution of the DX200 Interworking Unit, in Finnish (DX200 matkapuhelinkeskuksen datapalveluyksikön toteutus)||IND|
|Riihimäki, R.||Using Telecommunication for Competitive Advantage of an Enterprise, in Finnish ( Teletekniikka yrityksen kilpailuetuna)||IND|
|Rossi, T.||Alternative Solutions for Residential Multimedia Access in Hybrid Fibre Coax Networks||NTC|
|Saastamoinen, J.||Usage parameter conrol in ATM traffic, in Finnish (ATM-liikenteen yhteysparametrien valvonta)||NTC|
|Säynätjoki, V.||Customer acceptance testing of an intelligent network system, in Finnish (Erään älyverkkojärjestelmän hyväksyntätestaus)||TELE|
|Tenhunen, J.||Intelligent peripheral and connecting it to an intelligent network, in Finnish (Älykäs oheislaite ja sen liittäminen älyverkon osaksi)||HTC|
|Turkia, M.||Private branch exchange signalling over B-ISDN||NTC|
|Viitanen, K.||The Intelligent Network Feature and its Testing in the GSM system, in Finnish (Älyverkko-ominaisuus ja sen testaus GSM-järjestelmässä)||NTC|
|Vuori, K.||Simulation of preprocessor Unit in Switching Centre, in Finnish (Puhelinkeskusjärjestelmän esiprosessoriyksikön simulointi)||NTC|
|Åberg, M.||Software Development Using the Erlang Language||LME|
|HUT||Helsinki Univ.of Techn. / The Lab.of Telecomm. Technology|
|ICL||ICL Data Oy|
|LME||L M Ericsson|
|NMP||Nokia Mobile Phones|
|NRC||Nokia Research Center|
Tietoverkkolaboratorio on nyt osa Tietoliikenne- ja tietoverkkotekniikan laitosta. Tällä sivulla oleva tieto voi olla vanhentunutta.
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