Publications 2017

Conference articles (5)

P. Lähdekorpi, M. Hronec, P. Jolma and J. Moilanen, “Energy Efficiency of 5G Mobile Networks with Base Station Sleep Modes“, Proc. of the 2017 IEEE Conference on Standards for Communications & Networking (CSCN’17), Helsinki, Finland, September 18-20, 2017.

The paper presents system level simulation results on future base station energy saving using a time-triggered sleep model. The energy efficiency of future base station is compared in macro cellular network against a comparable baseline without usage of sleep modes. Furthermore, results for corresponding 4G case are shown using a restricted set of sleep modes supported by 4G networks.

The paper also proposes an analytical method for approximating system level energy saving gains of a base station. The results show rising trend of energy saving gain, when increasing the SS burst period of a 5G base station. However, the gains are seen to saturate at certain SS burst periodicity of 20 ms–40 ms.

Furthermore, the results illustrate the rising energy saving gains towards reduced system load. The results for 4G show energy saving gains up to 22 % due to reduced set of sleep modes available for use. Finally, the calculated energy saving gain values are closely aligned with the simulated values.

J. Puttonen, L. Sormunen and J. Kurjenniemi, “System level modeling of beam hopping for multi-spot beam satellite systems“, Proc. of the 23nd Ka and Broadband Communications Conference, Trieste, Italy, October 16-19, 2017.

Load distribution is time varying within satellite network coverage area, both in shorter and longer term. Beam hopped satellite systems have been proposed to provide flexibility, capacity increase and cost reduction for future High Throughput Satellite (HTS) systems.

In this article, we present beam hopping modelling of Satellite Network Simulator 3 (SNS3) and show performance results illustrating the potential of beam hopping over the traditional non-beam hopped satellite system. Beam hopping model on top of a system level simulator shall provide great insight into the system level performance of HTS systems as well as beam hopping algorithm optimization.

J. Puttonen, L. Sormunen and J. Kurjenniemi, “Aeronautical mobility model for multi-spot beam satellite systems“, Proc. of the 23nd Ka and Broadband Communications Conference, Trieste, Italy, October 16-19, 2017.

Satellite connectivity is deployed to aircraft either for air traffic control or in-flight entertainment purposes. Global connectivity necessitates the usage of multiple satellites and multiple spot-beams of different characteristics. This may bring some challenges related to the aircraft mobility management and overall network capacity optimization.

This article presents and validates a synthetic aeronautical mobility model for a dynamic system simulator called Satellite Network Simulator 3 (SNS3). Aeronautical mobility models are critical when designing new radio resource management algorithms e.g. for satellite / avionics use cases.

H. Martikainen, I. Viering, A. Lobinger and B. Wegmann, “Mobility and Reliability in LTE-5G Dual Connectivity Scenarios“, Toronto, Canada, September 24-27, 2017.

We are studying the mobility performance and the associated reliability of dual connectivity (DC) between a Long Term Evolution (LTE) macro layer and a 5G small cell layer in an urban environment.

We will observe that the reliability benefits of using basic DC as known from LTE are much smaller than expected. Significant improvements are achieved by introducing advanced extensions, but the residual outage will still not fulfill all the tight ultra-reliability limits in a scenario with meaningful mobility.

V. Hytönen, Z. Li, B. Soret and V. Nurmela, “Coordinated multi-cell resource allocation for 5G ultra-reliable low latency communications“, Proc. of the 2017 European Conference on Networks and Communications (EuCNC), Oulu, Finland, June 12-15, 2017.

The coming 5G cellular communication system is envisioned to support a wide range of new use cases on top of regular cellular mobile broadband services. One of the 5G usage scenarios is ultra-reliable low-latency communications (URLLC).

It has been predicted that URLLC will play an essential role in enabling wireless communications for emerging new services and applications such as factory automation, remote manipulation, autonomous driving and tactile Internet, to name a few. The two key performance metrics related to URLLC are latency and reliability.

In this paper three coordinated multi-cell resource allocation methods for 5G URLLC are presented in a typical indoor environment. From the simulation results, it can be observed that handling inter-cell interference effectively can lead to a significant performance improvement in terms of reliability without bringing any degradation to the latency performance.