Browsing by Author "Uusitalo, Mikko"
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Item 5G URLLC: Design challenges and system concepts(2018-10-12) Li, Zexian; Shariatmadari, Hamidreza; Singh, Bikramjit; Uusitalo, Mikko; Department of Communications and Networking; Nokia Bell Labs FinlandThe upcoming fifth generation (5G) wireless communication system is expected to support a broad range of newly emerging applications on top of the regular cellular mobile broadband services. One of the key usage scenarios in the scope of 5G is ultra-reliable and low-latency communications (URLLC). Among the active researchers from both academy and industry, one common view is that URLLC will play an essential role in providing connectivity for the new services and applications from vertical domains, such as factory automation, autonomous driving and so on. The most important key performance indicators (KPIs) related to URLLC are latency, reliability and availability. In this paper, after brief discussion on the design challenges related to URLLC use cases, we present an overview of the available technology components from 3GPP Rel-15 and potential ones from Rel-16. In addition, coordinated multi-cell resource allocation methods are studied. From the system level simulation results in an urban macro environment, it can be observed that effective multi-cell cooperation, more specifically soft combining, can lead to a significant gain in terms of URLLC capacity.Item Contention-Based Access for Ultra-Reliable Low Latency Uplink Transmissions(2018-04) Singh, Bikramjit; Tirkkonen, Olav; Li, Zexian; Uusitalo, Mikko; Department of Communications and Networking; Communications Theory; Nokia Bell Labs FinlandWe consider sporadic ultra-reliable and low latency communications in the uplink 5G cellular systems. Reliable low latency access for randomly emerging packet transmission needs cannot be guaranteed in current wireless systems. To achieve the goal of low latency and high reliability simultaneously, we propose a contention-based transmission scheme aimed for the users with small payloads. We target to reduce collision probability by considering multiple transmissions for the same packet for reliable reception. We find the optimal number of consecutive multiple transmissions that reduces collisions and achieves target reliability within the latency window. By means of intended frame structure design for the 5G cellular systems, results are drawn and comparisons are made with default multi-channel slotted ALOHA access scheme.Item Dual-mode Ultra Reliable Low Latency Communications for Industrial Wireless Control(2022) Zhou, Liang; Tirkkonen, Olav; Parts, Ulo; Khosravirad, Saeed R.; Baracca, Paolo; Korpi, Dani; Uusitalo, Mikko; Department of Communications and Networking; Communications Theory; Nokia Bell Labs USA; Nokia Bell Labs Germany; Nokia Bell Labs Finland; Inalambrica OyThis paper studies communications service availability for industrial wireless control systems. We consider a motion controller with a continuous closed-loop control link to a group of actuator devices on a factory floor. The goal is to satisfy end-to-end latency for each packet and to guarantee that the communication service will not be un-available for longer than a survival time. We propose to decouple the scheduling operation between the normal and survival modes of operation, enabling a dual-mode ultra-reliable and low-latency communications (URLLC) scheduler. Scheduler strategies for the survival mode are presented, targeting link adaptation and signal to interference and noise ratio (SINR) estimation in presence of temporal and spatial channel correlation. Through numerical examples, we investigate the impact of channel correlation on the schedulers ability to target the required reliability for each mode. We further present our findings on system-level performance evaluation of such scheduling strategies by adopting a realistic system setup and channel model to obtain insights with high level of realism. Extensive simulation results are presented which demonstrate significant reduction in resource utilization with the proposed dual-mode scheduler when compared to single-mode URLLC scheduling. Specifically, our results demonstrate that the scheduler should target moderate packet error rate (PER) for normal mode of operation and very low PER for the survival mode; the latter guarantees service availability while the former saves radio resources.Item Flexible Resource Allocation for Device-to-Device Communication in FDD System for Ultra-Reliable and Low Latency Communications(2017) Singh, Bikramjit; Li, Zexian; Uusitalo, Mikko; Department of Communications and Networking; Nokia Bell Labs FinlandUltra-reliable and low latency communications is envisioned to enable new services and applications with high reliability, availability and low latency, e.g, factory automation, Tactile Internet. Device-to-device communication is one such mean that allows devices to experience benefits in terms of shorter communication latency. Currently most device-to-device communication in frequency-division duplex system occurs in uplink spectrum. However, due to unbalanced cellular traffic in uplink and downlink bands may result poor spectrum utilization of network resource. In this paper, we investigate resource allocation where network offers reliable communication using normal cellular and device-to-device communications. We consider flexible allocation for device-to-device communication in both uplink and downlink bands in a frequency-division duplex system. The network optimizes resource allocation to improve the network rate with 99.999 % availability target. We demonstrate the usability of the proposed protocol in a factory scenario.Item Interference coordination in ultra-reliable and low latency communication networks(2018) Singh, Bikramjit; Tirkkonen, Olav; Li, Zexian; Uusitalo, Mikko; Department of Communications and Networking; Communications Theory; Nokia Bell Labs Finland5th Generation cellular communication is envisioned to enable connectivity for a wide range of new use cases. The focus on mission-critical communications, such as industrial automation and motion control, presses the demand for ultra-reliable communication. High availability, e.g., 99.999 % can be strived to reduce the outage probability. However, in multi-cell networks, interference from neighboring cells can be damaging in the ultra-reliable communication region. This requires a coordination amongst the interfering cells to relieve the interference in order to improve the network availability. In Multiple-Input, Multiple-Output based networks where the interference is colored, multiple base stations can coordinate by precluding the usage of precoders that increases the overall interference strongly. With this, multiple cells can jointly improve the minimum cell rate without inflicting harm to the other cell users, and thereby improve the network availability.Item Projektiomenetelmä magnetoenkefalografiassa(1993) Uusitalo, Mikko; Tietotekniikan osasto; Teknillinen korkeakoulu; Helsinki University of Technology; Lounasmaa, Olli V.Item Three player oligopoly model to evaluate the economic impact of cognitive radio(2010) Klemettilä, Arttu; Berg, Kimmo; Uusitalo, Mikko; Matematiikan ja systeemianalyysin laitos; Perustieteiden korkeakoulu; School of Science; Ehtamo, HarriCurrently, all wireless communication has been assigned to use a specific part of the spectrum. Regulation has caused the current allocation method to be very inefficient. As a solution to this problem, the concept of cognitive radio was introduced. The main idea is to make the spectrum dynamically available, so that devices can select the frequency bands that are not used at a certain time and location. Cognitive radio still requires heavy technological development and extensive changes in regulation and the rules of spectrum use. This will also change the business ecosystem. Cognitive radio will require all the key players of the market to join the development, which in turn requires that they find the new technology profitable to them. Not only will costs and demands change, but also the whole structure of the ecosystem might undergo transformations. In this thesis we construct a game theoretic three player oligopoly model to study how the changes brought by cognitive radio affect the business ecosystem, and whether it will be profitable for the key players to support cognitive radio. The thesis also describes a framework to help find the interactions between technological and regulatory decisions and the market parameters. With these interactions we can then estimate the value and compare different types of cognitive radio implementations. Using parameters based on a scenario of the year 2015, the model predicts that cognitive radio will be profitable to all the key players. The only question is, when will it become reality. Our studies suggest that in the short term the shortage of spectrum might be beneficial to the network operators. We also examine possible coalitions between business sectors and basic guidelines for technological development, which all affect the possibilities of cognitive radio.Item Towards versatile access networks(2023-06-06) Ghoraishi, Mir; Alexiou, Angeliki; Cogalan, Tezcan; Conrat, Jean Marc; De Guzman, Mar Francis; Devoti, Francesco; Eappen, Geoffrey; Fang, Chao; Frenger, Pål; Girycki, Adam; Guo, Hao; Halbauer, Hardy; Haliloglu, Omer; Haneda, Katsuyuki; Koffman, Israel; Kyösti, Pekka; Leinonen, Marko; Li, Yinggang; Madapatha, Charitha; Makki, Behrooz; Navarro-Ortiz, Jorge; Nguyen, Le Hang; Nimr, Ahmad; Pärssinen, Aarno; Pollin, Sofie; Pryor, Simon; Puerta, Rafael; Rahman, Md Arifur; Ramos-Munoz, Juan J.; Ranjbar, Vida; Roth, Kilian; Sarajlic, Muris; Sciancalepore, Vincenzo; Svensson, Tommy; Tervo, Nuutti; Wolfgang, Andreas; Gigasys Solutions; University of Piraeus; Samsung; Orange; Department of Electronics and Nanoengineering; NEC Corporation; Brunel University London; Chalmers University of Technology; Ericsson AB; IS-Wireless; Nokia Solutions and Networks GmbH & Co. KG; RunEL; University of Oulu; Instituto Carlos I de Física Teórica y Computacional; Technische Universität Dresden; KU Leuven; Acceleran; University of Granada; Intel; Qamcom Research and Technology AB; Bulakçı, Ömer; Li, Xi; Gramaglia, Marco; Gavras, Anastasius; Uusitalo, Mikko; Rugeland, Patrik; Boldi, MauroCompared to its previous generations, the 5th generation (5G) cellular network features an additional type of densification, i.e., a large number of active antennas per access point (AP) can be deployed. This technique is known as massive multipleinput multiple-output (mMIMO) [1]. Meanwhile, multiple-input multiple-output (MIMO) evolution, e.g., in channel state information (CSI) enhancement, and also on the study of a larger number of orthogonal demodulation reference signal (DMRS) ports for MU-MIMO, was one of the Release 18 of 3rd generation partnership project (3GPP Rel-18) work item. This release (3GPP Rel-18) package approval, in the fourth quarter of 2021, marked the start of the 5G Advanced evolution in 3GPP. The other items in 3GPP Rel-18 are to study and add functionality in the areas of network energy savings, coverage, mobility support, multicast broadcast services, and positioning.
