Preben Mogensen’s research while affiliated with Aalborg University and other places

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Publications (485)


Real-Time Overshoot and Undershoot Detection in Cellular Networks
  • Article
  • Full-text available

January 2025

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15 Reads

IEEE Access

José Antonio Trujillo

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Rasmus Lykke

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Isabel de la Bandera

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[...]

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Preben E. Mogensen

One of the most crucial aspects of cellular networks is coverage, as it determines the areas where users can connect to the network and utilize its services. In the past, the use of planning tools was common practice for the establishment of coverage areas and network capacity prior to the deployment of a network. However, issues with coverage, such as interference or coverage gaps, may arise due to equipment malfunctions, suboptimal configurations, or alterations in the propagation environment. In particular, an inadequate antenna tilt configuration can result in overshoot or undershoot situations on the network, which in turn can give rise to the aforementioned problems. This paper proposes a methodology for the real-time detection of overshoot and undershoot situations. To achieve this goal, KPI (Key Performance Indicators) are analyzed using machine learning techniques. Given the difficulty of detecting coverage problems in mobile networks, the results obtained suggest that the methodology provides a consistent knowledge base for optimizing the antenna tilt, thereby improving network performance.

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Multi-Connectivity Solutions for Rural Areas: Integrating Terrestrial 5G and Satellite Networks to Support Innovative IoT Use Cases

November 2024

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78 Reads

5G cellular networks are now a reality and promise to improve key performance indicators (KPIs), such as Gbps data rates and latencies in the order of milliseconds. While some of these KPIs are achievable in urban scenarios, rural areas often face challenging connectivity conditions due to the lack of terrestrial network (TN) infrastructure. To solve this problem, non-terrestrial networks (NTNs) such as satellite-based solutions, have been introduced to provide coverage in remote regions. Therefore, a multi-connectivity approach can be integrated to simultaneously serve an end-user by merging satellite and cellular links in a joint approach. This study explores, using experimental data, the benefits of both TN-TN and TN-NTN multi-connectivity in rural environments. The results obtained demonstrate that a traditional single-connectivity approach may not be sufficient to provide service to rural environments due to the KPIs requirements given several use cases within these rural areas. The multi-connectivity strategy, which jointly integrates 5G and satellite networks, meets the network availability requirements for latency, downlink throughput, and uplink throughput KPIs at least 98%, 99%, and 95% of the time, respectively, for several use cases, such as precision agriculture, livestock monitoring, and forest management. These include applications like microclimate monitoring, remote operational support, early pest detection, and real-time tracking of livestock transport.



Fig. 6. RSSI values for TX -Extender and RX -Extender links versus downlink throughput measured through the three different scenarios. Measurements correspond to median values for transmissions in each location in the 6 GHz band.
Wi-Fi 6E Mesh Networks: Where To Place The Extenders?

Wi-Fi is one of the WLANs technologies with the highest penetration in society worldwide. In recent years, Wi-Fi 6E has been defined, which uses the 6 GHz band with higher bandwidth and resource availability. However, the range for this band decreases due to the increase in frequency compared to 2.4 GHz and 5 GHz bands, hence the proposal for the use of mesh networks to overcome the limited range. Therefore, this work empirically assesses the network performance through different setups in indoor scenarios to determine the optimal placement of extender nodes in a Wi-Fi 6E mesh network. The experimental methodology follows a dual approach, studying the channel propagation conditions in the 6 GHz band versus 2.4 GHz and 5 GHz, as well as the throughput reported through connectivity with Wi-Fi 6E. The results quantitatively show the reduction in effective network range in the 6 GHz band, due to the increase in frequency, and its influence on effects such as blocking or around-corner propagation. Based on this analysis, a set of guidelines is developed for positioning the extender nodes in the network to maximize network performance according to the propagation channel conditions.






Observations on Large-Scale Attenuation Effects in a 26 GHz Urban Micro-Cell Environment

July 2024

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29 Reads

IEEE Wireless Communications Letters

This letter presents a measurement campaign carried out in an FR2 urban outdoor environment in a live experimental network deployment. The radio propagation analysis from a physical perspective at 26 GHz is essential for the correct deployment and dimensioning of future communication networks. This study performs a walk test emulating realistic conditions under which a pedestrian may be affected, summarizing and evaluating some of the typical effects encountered in a communications scenario such as penetration losses in a building, losses due to vegetation or the human body, or diffraction/scattering propagation around corners in street canyon-like environments. The operational conditions of the 5G network, the urban micro-cell scenario, and the use of omnidirectional antennas on the UE side validate the channel conditions from a perspective closer to a realistic scenario for a pedestrian within a FR2 live network.



Citations (73)


... In this evolving landscape, beam steering has become a key technology for modern wireless systems. By dynamically directing radiated energy, beam steering improves signal quality and reduces interference, thereby enhancing both coverage and overall system capacity [1]. ...

Reference:

Beam-Switching Antennas Using a Butler Matrix with a Five-Element Configuration
Beam Switching in mmWave 5G: Evaluation in a Realistic Industrial Scenario

IEEE Access

... An energy-saving C-plane design is fundamental to achieving an 'alwaysavailable' 6G network rather than 'always-on', for example, by extending the schemes for on-demand request by a device of synchronization signal blocks (SSBs) and essential system information introduced in 5G-Advanced, and by decoupling SSB from system information transmissions (SIB1). The energy-saving U-plane design should enable dynamic radio resource adaptations based on cell load and QoS/QoE targets to ensure energy-efficient transmissions of user data when leveraging the new hardware capability of fast reactivation [11]. The RAN design is further elaborated in the following section. ...

On the Potential of Radio Adaptations for 6G Network Energy Saving
  • Citing Conference Paper
  • June 2024

... We have seen the benefit of cooperative resource allocation schemes over mode 2 [17], [18], HARQ and LAAG applied to mode 2 and cooperative schemes [25], and directional antennas to mode 2 [31] knowing that interference is a limiting factor for D2D. In order to increase swarm sizes FIGURE 1. Two UE-centric proximity ranges to exchange discovery messages (r e ) and data (r c ). ...

New Radio Sidelink with Beam Selection for Reliable Communication in High-Density Dynamic Swarms

... Traditional last-mile delivery systems face a complex array of operational challenges that significantly impact efficiency and customer satisfaction in urban environments. Recent IEEE research has highlighted that the integration of smart logistics solutions has become crucial as traditional delivery methods struggle with an average efficiency rate of only 67% in dense urban areas [3]. These challenges are particularly pronounced in smart cities, where the complexity of delivery environments requires sophisticated optimization approaches to maintain service quality. ...

Experimental Evaluation and Modeling of the Accuracy of Real-Time Locating Systems for Industrial Use

IEEE Access

... These studies mainly focus on whether the KPIs of 5G meet the specific needs of various industrial scenarios. In [16], A complete 5G network was set up in an indoor industrial scenario, with the user equipment (UE) used as a measurement device to test system performance of latency and packet loss. The experiment empirically analyzed the changes in the measured metrics under different conditions, including varying packet sizes, whether the UE was stationary or moving, and with an increasing number of interfering UEs. ...

An Empirical Study of 5G, Wi-Fi 6 and Multi-Connectivity Scalability in an Indoor Industrial Scenario

IEEE Access

... Note that for 4G technology, which will also be analyzed in the experimental development of the work, the OFDM symbols and subcarriers are grouped in Cell Specific Reference Signal (CRS). Thus, the signal strength of the cellular network is set as the Reference Signal Received Power (RSRP) which is the power level averaged over 127 SSB subcarriers in 5G [38], or averaged over the CRS signal in 4G. Concerning the satellite network, Starlink has approximately 4,500 satellites deployed in LEO orbit by the time of measuring, and is currently the satellite network with the highest broadband service worldwide. ...

FR2 5G Networks for Industrial Scenarios: Experimental Characterization and Beam Management Procedures in Operational Conditions

IEEE Transactions on Vehicular Technology

... It is composed of three main nodes (a local machine, a factory machine, and one instance of the global MS Azure Cloud), with the computing capabilities summarized in Table 1, and two different access networks (5G and Ethernet-LAN), with the reference connection performance numbers compiled in Table 2 for average upstream (US) and downstream (DS) data-rates and round-trip time (RTT) latencies. Message queuing telemetry transport (MQTT) with publish/subscribe (Pub/Sub) architecture was chosen as the high-level communication protocol based on the findings from our previous work [33]. In this architecture, the local machine is in charge of executing a variable number of robot instances, which are publishers/subscribers to a common specific MQTT topic. ...

An Operational 5G Edge Cloud-Controlled Robotic Cell Environment Based on MQTT and OPC UA
  • Citing Conference Paper
  • December 2023

... Some literature have focused on the impact of core network and terminal variations on network performance. In [19], tests were conducted on different three configurations of the core network, NPN 5G Standalone (SA), Evolved Packet Core (EPC), and EPC+IPSec, with the same access network being an independent radio access network (RAN). User plane data was routed back to a cloud sever in the laboratory. ...

Commercial 5G NPN and PN Deployment Options for Industrial Manufacturing: An Empirical Study of Performance and Complexity Tradeoffs
  • Citing Conference Paper
  • September 2023

... When the reinforcement-learning (RL) approach was used to choose RN selection, it enhanced energy efficiency by 80% and spectrum-efficiency by 75% in comparison with an approach that relied solely on [16] introduced a novel integrating technique that skillfully combined the car to car network-hierarchical deep neural network (CtCNET-HDRNN) framework with 5G's millimeter-wave (mmWave) and Monte-Carlo for dedicated-short-range-communications (DSRC) networks to ensure communication efficiency. In comparison to non-diversity decision-making situations, they found that using multiple antennas over 5,30,45,50, and 60 kHz significantly improved data rates, especially during lane shifts at velocities reaching as high as 188 km/h. ...

Signaling Design for Cooperative Resource Allocation and Its Impact to Message Reliability

IEEE Access

... For [46] propose a framework to assess the feasibility of 5G in intralogistics, highlighting its low latency and high reliability for the connectivity of devices and automated guided vehicles (AGVs), improving mobile robot control and real-time monitoring. According to [47], they analyze how 5G optimizes the coordination of autonomous mobile robots in manufacturing, enabling continuous communication and advanced analytics for more efficient production processes. [48] explore the impact of 5G on smart factories, enabling the integration of devices and systems, and supporting innovative architectures such as mesh networks and SDN for greater flexibility. ...

Towards the 5G-Enabled Factories of the Future
  • Citing Conference Paper
  • July 2023