Ole Grondalen | Telenor Research (original) (raw)

Papers by Ole Grondalen

The EMPOWER project, since its launch in November 2018, has been following closely all developmen... more The EMPOWER project, since its launch in November 2018, has been following closely all developments around 5G and its evolution in the short, medium and long terms. This is with the aim to develop a comprehensive advanced wireless technology roadmap synthesizing all the views from all the stakeholder R&D communities. This update of the trends in wireless technologies, WP2 deliverable D2.3, is following up the first trend report from 2019, D2.1. It also captures the feedback from the consultation on the first EMPOWER B5G technology roadmap, D2.2 from October 2019. The following summarizes the key topics presented in this deliverable: 1) Identification of key stakeholders in the wireless R&D communities, in Europe, the USA, in Asia, and globally, covering various forums, alliances, and organizations that have been followed by the EMPOWER roadmap team to capture and analyse the trends. 2) Targeted KPIs for the evolution of 5G in the short, medium and long terms, based on the consultati...

This white paper analyses vertical use cases of various domains for their performance KPIs and th... more This white paper analyses vertical use cases of various domains for their performance KPIs and their mapping to 5G network KPIs. The scope is to identify (based on architectural elements analysis, information flow, etc.) the potential impact on the service performance and user perceived quality. The challenge is to understand the relative influence of 5G network performance indicators to the vertical services. The KPIs mapping methodology includes three steps:<br> - Research on definitions and information derived from the respective 5G-PPP projects, standardisation bodies and respective alliances e.g. ITU, NGMN etc., as well as definition of use cases from 5G-PPP projects' respective.<br> - Identification of relevant key service KPIs and their definitions that are of importance to the respective industry.<br> - Mapping of selected services KPIs on the respective network KPIs that impact the operation of the architectural elements that participate in the service...

2017 IEEE 28th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2017

An efficient way to tame inter-cell interference is by muting selected Base Stations (BSs) in som... more An efficient way to tame inter-cell interference is by muting selected Base Stations (BSs) in some time-slots to allow users that get strong interference to be served. However finding good muting schemes is a challenge. In this paper we propose two novel methods for finding good BS muting schemes denoted as the complementing method and the sequential method. The methods focus on finding good combinations of muted and un-muted BSs, also referred to as muting configurations. The performance of these methods were compared to the performance of a simple macro muting scheme and to random selection of muting configurations. The comparisons were made for sets of up to 50 muting configurations. The complementing configuration method showed 19% and 9% higher geometrical mean user bitrate than the simple macro muting scheme and the best randomly selected set of muting configurations respectively. The sequential method achieved the best performance, albeit with a cost of higher complexity, whi...

2017 European Conference on Networks and Communications (EuCNC), 2017

Efficient interference control is a prerequisite for realizing the possible capacity gains in lar... more Efficient interference control is a prerequisite for realizing the possible capacity gains in large heterogeneous networks. An efficient way to do this is to mute some Base Station (BS) transmissions in some time frames to let other BSs serve their users. Two approaches for doing this is studied; a simple one similar to the schemes used in current mobile technologies and a more complex one with higher performance gains. The complex approach jointly optimizes user attachment, scheduling and muting and requires that a large convex optimization problem is solved. By exploiting structure and sparseness properties it is shown that the computational complexity can be significantly reduced, so that the method can be feasible even in relatively large networks. The performance of the two approaches were compared in a simulation study. It was found that the simple method gave significant performance improvements compared to the case without interference control and that it offered flexibility...

International Journal of Wireless & Mobile Networks, 2017

Journal of Signal Processing Systems, 2013

2017 29th International Teletraffic Congress (ITC 29), 2017

Machine-to-machine (M2M) traffic is variegate and finding a traffic model which can cover a wide ... more Machine-to-machine (M2M) traffic is variegate and finding a traffic model which can cover a wide range of M2M sources is challenging. In this paper we address this challenge by proposing an extension of legacy renewal processes for modeling of M2M traffic sources. To this end, we first describe the model and derive some performance parameters, as the overall packet arrival distribution and its moments. We then discuss the packetgeneration process and consider the counting variable in atime interval, and give the mean and the Laplace transformof the z-transform for this variable. Successively, we present the asymptotic expansion for the variance and the Index of Dispersion of Counts (IDC). We derive the expression of the two first coefficients of this expansion in the general case, while more explicit expressions are provided for some special cases. More specifically, for the special case of a source model with two states, geometric distribution of the numbers of arrivals in each sta...

ArXiv, 2021

This paper presents the results of a measurement campaign to investigate and analyze the performa... more This paper presents the results of a measurement campaign to investigate and analyze the performance of a 5G Millimeter Wave (mmWave) cell. We evaluate the signal and beam coverage map of an operational network, considering various scenarios, including human body blockage effects, foliagecaused and rain-induced attenuation, and water surface effects. To the best of our knowledge, this paper is the first to report on a commercial deployment while not treating the radio as a black box. This measurement analysis provides useful information for researchers and 5G verticals to fully understand and appropriately model the mmWave signals propagation in a real-world and operational deployment.

Following current trends towards dynamic spectrum allocation and cognitive radio, this paper prop... more Following current trends towards dynamic spectrum allocation and cognitive radio, this paper proposes a new approach and innovative techniques to support the coexistence of licensed and unlicensed wireless users in a same area. Theproposed concept, called Sensor Network aided Cognitive Radio, consists of a wireless sensor network able to assist the cognitive network by providing information on the current spectrum occupancy. This concept, that will address various operational scenarios in the future networks, involves a set of advanced wireless communications techniques like spectrum sensing, interference management, cognitive radio reconfiguration management, cooperative communications, end-to-end protocol design and cross-layer optimisation. All these enabling techniques together will form a compound system able to improve the spectrum use in a significant way. The main target scenario we consider is the use of nomadic cognitive radios in urban and suburban areas. Our objective is...

IEEE Access, 2020

The fifth generation (5G) of mobile radio technologies has been defined as a new delivery model w... more The fifth generation (5G) of mobile radio technologies has been defined as a new delivery model where services are tailored to specific vertical industries. 5G supports three types of services with different and heterogeneous requirements, i.e. enhanced Mobile Broadband (eMBB), Ultra-Reliable Low-Latency Communications (URLLC) and massive Machine-Type Communications (mMTC). These services are directly related to exemplary verticals such as media, vehicular communications or the Industry 4.0. This work provides a detailed analysis and performance evaluation of 5G New Radio (NR) against a set of Key Performance Indicators (KPI), as defined in the International Mobile Telecommunications 2020 (IMT-2020) guidelines, and provides an overview about the fulfillment of their associated requirements. The objective of this work is to provide an independent evaluation, complementing the Third Generation Partnership Project (3GPP) contribution. From the original group of sixteen KPIs, eleven of ...

Spectrum resources unused in the spatio-temporal domain, so-called whitespace, can be utilised by... more Spectrum resources unused in the spatio-temporal domain, so-called whitespace, can be utilised by opportunistic devices during the absence of their incumbent users. The possibility to opportunistically use whitespace implies the knowledge of diverse constraints: knowledge about whitespace utilisation, which can be obtained by spectrum sensing or from a data repository and constraints internal to the opportunistic system, such as quality of service (QoS) levels and mobility targets. The use of whitespace requires therefore a multi-faced management of the above constraints. In this paper, an architecture for use of whitespaces under QoS and mobility constraints is proposed. The proposed architecture flexibly adapts to different operating scenarios also described in this paper. Examples show how different realisations of the same architecture are derived. The interactions of constituent blocks are illustrated also with the help of charts, showing the management of context information a...

To exploit spectrum resources on a secondary basis, a Sensor Network Aided Cognitive Radio Networ... more To exploit spectrum resources on a secondary basis, a Sensor Network Aided Cognitive Radio Network uses a wireless sensor network that assists a secondary cognitive radio network by providing information about the current primary spectrum occupancy. In this paper we aim to find the optimal cell size for the secondary network that exploits spectrum holes identified by the wireless sensor network. The secondary base station is deployed co-located with a mobile primary network that uses a cellular reuse pattern with seven frequencies. Performance of the secondary system and impact on the primary system is mainly studied in terms of throughput, packet loss and coverage when using spectrum holes in the space, time and frequency domains. Especially, we find that the cell size and configured transmit powers for the secondary system is important for optimal system performance, and that smaller cell sizes and less expensive base stations for the secondary system is beneficial. The impact on ...

… of International workshop …, 2002

International Journal of Wireless & Mobile Networks (IJWMN), 2019

In this paper we discuss and compare methods to analyse the influence inter-cell interference wil... more In this paper we discuss and compare methods to analyse the influence inter-cell interference will have on coverage/outage probabilities in cellular networks. The framework is based on a common method to find the Laplace transform of the distribution of interference from neighbouring cells. It turns out that for Suzuki distributed fading the analysis is highly simplified. In case of Rayleigh faded channels only, the analysis is even more simplified. The modelling approach, which is based on classical probab ility methods, rather than on modern measure theory for point processes, allows for both fixed and stochastic locations of base stations. The different models are applied to quantify the effect of inter-cell interference on coverage/outage probabilities and on spectrum efficiencies in LTE networks. We consider several scenarios ranging from fixed hexagonal layout of base station to stochastic location of based on uniform distribution of base stations. We also extend the coverage/...

2019 European Conference on Networks and Communications (EuCNC)

2016 IEEE 27th Annual International Symposium on Personal, Indoor, and Mobile Radio Communications (PIMRC), 2016

IEEE Transactions on Vehicular Technology, 2016