Department of Information and Communications Engineering

Performance Analysis

The group studies mathematical modelling and analysis of the traffic and performance of modern ICT systems. The methods are typically based on applied probability, queueing theory, teletraffic theory, scheduling theory, and stochastic optimal control techniques. In addition, event-based simulation and other numerical methods are utilised in the research.
Server Cluster, constructed by Pasi Lassila

The group was established by Prof. Jorma Virtamo, who also led it until his retirement in 2009. From that on, the group has been led by Dr. Samuli Aalto. It is an internationally recognized research group in the area of queueing and teletraffic theory, as well as the stochastic performance analysis of ICT systems.

  Current and recent research topics include:

  • Analysis of the performance-energy trade-off in queueing systems under various scheduling disciplines
  • Analysis of performance degradation in parallel-server systems
  • Analysis of signalling performance for M2M traffic in wireless systems
  • Optimal scheduling problem in queueing systems based on the Gittins index approach
  • Near-optimal dispatching control of energy-aware parallel service systems based on the Whittle index approach
  • Near-optimal opportunistic scheduling control in wireless systems based on the Whittle index approach
  • Near-optimal load balancing problem in energy-aware 5G HetNets based on the Whittle index approach


The research group is led by Dr. Samuli Aalto.

Latest publications

Minimizing the mean slowdown in the M/G/1 queue

Samuli Aalto, Ziv Scully 2023 QUEUEING SYSTEMS

Minimizing the mean slowdown in a single-server queue

Samuli Aalto 2022 QUEUEING SYSTEMS

On the Gittins index for multistage jobs

Samuli Aalto, Ziv Scully 2022 QUEUEING SYSTEMS

Near-optimal uplink scheduling for age-energy tradeoff in wireless systems

Pasi Lassila, Samuli Aalto 2021 2021 33th International Teletraffic Congress (ITC-33)

On value functions for FCFS queues with batch arrivals and general cost structures

Esa Hyytiä, Rhonda Righter, Jorma Virtamo, Lauri Viitasaari 2020 Performance Evaluation

Indexability of an opportunistic scheduling problem with partial channel information

Samuli Aalto, Pasi Lassila, Ianire Taboada 2019 Proceedings of the 12th EAI International Conference on Performance Evaluation Methodologies and Tools, VALUETOOLS 2019

Near-optimal dispatching policy for energy-aware server clusters

Samuli Aalto, Pasi Lassila 2019 Performance Evaluation

Whittle index approach to opportunistic scheduling with partial channel information

Samuli Aalto, Pasi Lassila, Ianire Taboada 2019 Performance Evaluation

Performance Degradation in Parallel-Server Systems

Josu Doncel, Samuli Aalto, Urtzi Ayesta 2019 IEEE/ACM Transactions on Networking
More information on our research in the Aalto research portal.
Research portal
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