BT Technology

Ipswich, United Kingdom

BT Technology

Ipswich, United Kingdom

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Moscholios I.D.,University of Peloponnese | Kallos G.A.,BT Technology | Katsiva M.A.,University of Peloponnese | Vassilakis V.G.,University of Surrey | Logothetis M.D.,University of Patras
Journal of Telecommunications and Information Technology | Year: 2014

In this paper, a multirate loss model for the calculation of time and call congestion probabilities in a Wideband Code Division Multiple Access (W-CDMA) cell is considered. It utilizes the Bandwidth Reservation (BR) policy and supports calls generated by an infinite or finite number of users. The BR policy achieves QoS equalization by equalizing congestion probabilities among calls of different service-classes. In the proposed models a multiple access interference is considered, and the notion of local blocking, user's activity and interference cancelation. Although the analysis of the proposed models reveals that the steady state probabilities do not have a product form solution, the authors show that the calculation of time and call congestion probabilities can be based on approximate but recursive formulas, whose accuracy is verified through simulation and found to be quite satisfactory.


Moscholios I.D.,University of Peloponnese | Kallos G.A.,BT Technology | Vassilakis V.G.,University of Surrey | Logothetis M.D.,University of Patras
Wireless Personal Communications | Year: 2014

We propose a new multirate teletraffic loss model for the calculation of time and call congestion probabilities in CDMA-based networks that accommodate calls of different service-classes. The call arrival process follows a batched Poisson process, which is more “peaked” and “bursty” than the ordinary Poisson process. The call-admission-control policy is based on the partial batch blocking discipline. This policy accepts a part of the batch (one or more calls) and discards the rest, if the available resources are not enough to accept the whole batch. The proposed model takes into account multiple access interference, both the notion of local (soft) and hard blocking, the user’s activity, as well as interference cancellation. Although the analysis of the model does not lead to a product form solution of the steady state probabilities, we show that the call-level performance metrics, time and call congestion probabilities can be efficiently calculated based on approximate but recursive formulas. The accuracy of the proposed formulas are verified through simulation and found to be quite satisfactory. Comparison of the proposed model with that of Poisson input shows the necessity of the new model. We also show the consistency of the new model over changes of its parameters. © 2014, Springer Science+Business Media New York.


Lehne P.H.,Telenor Norway | Grondalen O.,Telenor Norway | MacKenzie R.,BT Technology | Noguet D.,CEA Grenoble | Berg V.,CEA Grenoble
Journal of Signal Processing Systems | Year: 2013

Cognitive Radio has been one of the key research topics in the wireless community for about 10 years. The digital switch-over in the TV bands provides opportunities for Cognitive Radio Systems (CRS) to operate in the 470-790 MHz spectrum under incumbent protection restrictions. Locally unused spectrum in this band is often referred to as TV whitespace (TVWS). Regulatory bodies, in particular the US Federal Communications Commission (FCC) and Ofcom in the UK, have specified parameters under which CRS shall operate. In this paper we analyse key scenarios for CRS stemming from the QoSMOS project. We then analyse how these scenarios can be mapped into the TV whitespace (TVWS) context by considering link budget computation based on FCC and Ofcom transmit power recommendations plus statistical propagation models for the UHF band. We also consider the expected capacity which can be achieved when using TVWS as a capacity extension in an LTE network. We also show how cognitive femtocells can be used to provide outdoor coverage when deployment is based on random location. We eventually conclude on the most promising scenarios in the context of the TVWS usage. © 2013 Springer Science+Business Media New York.


Moscholios I.D.,University of Peloponnese | Katsiva M.A.,University of Peloponnese | Kallos G.A.,BT Technology | Vassilakis V.G.,University of Surrey | Logothetis M.D.,University of Patras
2014 9th International Symposium on Communication Systems, Networks and Digital Signal Processing, CSNDSP 2014 | Year: 2014

In this paper, we consider a multirate teletraffic loss model for the calculation of congestion probabilities in a Wideband Code Division Multiple Access (W-CDMA) cell that utilizes the Bandwidth Reservation (BR) policy and supports calls generated by a finite number of users. The BR policy is used particularly to equalize congestion probabilities among calls of different service-classes. In the proposed model we consider multiple access interference, the notion of local blocking, user's activity and interference cancellation. We show that the calculation of congestion probabilities is based on approximate but recursive formulas, whose accuracy is verified through simulation and found to be quite satisfactory. © 2014 IEEE.


Arshad K.,University of Greenwich | Mackenzie R.,BT Technology | Celentano U.,University of Oulu | Drozdy A.,Budapest University of Technology and Economics | And 5 more authors.
IEEE Communications Magazine | Year: 2014

Cognitive radio technology is a key enabler to reuse a finite, scarce, and expensive resource: the radio spectrum. Guaranteeing required levels of QoS to cognitive users and ensuring necessary protection to incumbent users are the two main challenges in opportunistic spectrum access. This article identifies the main requirements and challenges for QoS support in cognitive radio networks. A framework for a twofold cognitive manager is presented; one part managing spectrum availability on longer timescales and the other handling resource management on shorter timescales. This article gives particular focus to the functionalities of the latter cognitive manager related to resource management. Finally, we present a few key scenarios and describe how QoS can be managed with the proposed approach without disturbing the communications of incumbent users. © 2014 IEEE.


Moscholios I.D.,University of Peloponnese | Vabilakis V.G.,University of Cambridge | Kallos G.A.,BT Technology | Logothetis M.D.,University of Patras
Proceedings of the 13th International Conference on Telecommunications, ConTEL 2015 | Year: 2015

CDMA-based technologies deserve abiduous analysis and evaluation. We study the performance, at call-level, of a CDMA cell with interference cancellation capabilities, while abuming that the cell accommodates different service-clabes of batched Poibon arriving calls. The partial batch blocking discipline is applied for Call Admibion Control (CAC). To guarantee certain Quality of Service (QoS) for each service-clab, the Bandwidth Reservation (BR) policy is incorporated in the CAC; i.e., a fraction of system resources is reserved for highspeed service-clabes. We propose a new multirate lob model for the calculation of time and call congestion probabilities. The notion of local (soft) and hard blocking, users activity, interference cancellation, as well as the BR policy, are incorporated in the model. Although the steady state probabilities of the system do not have a product form solution, time and call congestion probabilities can be efficiently determined via approximate but recursive formulas. Simulation verified the high accuracy of the new formulas. We also show the consistency of the proposed model in respect of its parameters, while comparison of the proposed model with that of Poibon input shows its necebity. © 2015 IEEE.


MacKenzie R.,BT TECHNOLOGY | Briggs K.,BT TECHNOLOGY | Gronsund P.,TELENOR ASA | Lehne P.,TELENOR ASA
IEEE Wireless Communications | Year: 2013

Spectrum trading is an important tool for increasing overall and local spectrum utilization, and to enable access to new and additional spectrum for mobile operators. However, the current spectrum trading regimes usually require long times to execute a trade, hence limiting the flexibility over short timescales in addition to limiting the granularity of the bandwidth and geographical units that may be traded. In this article we discuss the concept of spectrum micro-trading to enable trading of spectrum on the micro-scale in at least three dimensions: the micro-spatial, micro-temporal, and micro-frequency scales. An ecosystem for spectrum micro-trading is presented along with the most important metrics for spectrum micro-trading evaluation. Results from a simulation study for mobile operators, where spectrum is traded via auction, show that the market is viable using the proposed spectrum micro-trading model, and that spectrum utilization can be greatly improved. © 2013 IEEE.


News Article | February 24, 2017
Site: globenewswire.com

Together with university research partner King's College London, Ericsson (NASDAQ: ERIC) and BT have signed a multi-year collaboration agreement on 5G testing and development. King's College contributes with low-latency use cases and specialized knowledge in communication technologies, robotics and haptic control. The collaboration will focus on creating 5G use cases in commercial and consumer markets, with particular focus on mission-critical services such as medical applications. It will involve research into the technical and economic aspects of key 5G-enabling technologies. With the ambition to be first to market with 5G services in the UK, BT has worked with Ericsson to build a 5G Proof of Concept Center at the BT Labs in Adastral Park, Ipswich. With access to the 5G for Europe core network - linking multiple centers and universities across Europe - Ericsson and BT are testing the network architecture needed to most efficiently deliver commercial 5G services. Howard Watson, CEO, BT Technology, Service & Operations, and BT Group CIO, says: "The initial focus of the collaboration is on Proof of Concept solutions and trials of services needing both high availability and low latency - both key features of the forthcoming 5G technology." In 2016, BT bought EE, the United Kingdom's leading 4G network provider. Together, we have the opportunity to build on our existing infrastructure to create a truly converged fixed and mobile network. We look forward to working with Ericsson and Kings College London as we examine the possibilities of 5G, and what it can deliver in terms of flexibility, scalability and the high bandwidths that our customers will require in the future." Anders Lindblad, Senior Vice President and Head of Business Unit IT & Cloud Products, says:"5G is the foundation for expanding the potential to all Industries.  The cooperation with BT to trial services using 5G technology demonstrates Ericsson's commitment to drive market demand and adoption. By establishing network slices in the context of 5G will be like virtual networks on-demand, and will be crucial for the mission-critical services being trialed." A demonstration of these capabilities will be on display outside Ericsson's Hall 2 at Mobile World Congress. BT's purpose is to use the power of communications to make a better world. It is one of the world's leading providers of communications services and solutions, serving customers in 180 countries. Its principal activities include the provision of networked IT services globally; local, national and international telecommunications services to its customers for use at home, at work and on the move; broadband, TV and internet products and services; and converged fixed-mobile products and services.  BT consists of six customer-facing lines of business: Consumer, EE, Business and Public Sector, Global Services, Wholesale and Ventures, and Openreach. For the year ended 31 March 2016, BT Group's reported revenue was £19,042m with reported profit before taxation of £3,029m. British Telecommunications plc (BT) is a wholly-owned subsidiary of BT Group plc and encompasses virtually all businesses and assets of the BT Group. BT Group plc is listed on stock exchanges in London and New York. Anything can happen on the digital frontier, a promising but undiscovered future. From February 27 to March 2 in Barcelona, Spain, Ericsson is demonstrating a collaborative approach and innovative solutions to succeed in this arena. With our customers and partners, we work across industries, physical boundaries and perceived limitations. Join us in Hall 2 or online during MWC 2017 and engage in conversations and demonstrations about our favorite things: 5G; platforms and services for IT, Cloud, Networks and TV & Media; connected solutions for industries; the Internet of Things; and partnering for success. See you there! Ericsson is a world leader in communications technology and services with headquarters in Stockholm, Sweden. Our organization consists of more than 111,000 experts who provide customers in 180 countries with innovative solutions and services. Together we are building a more connected future where anyone and any industry is empowered to reach their full potential. Net sales in 2016 were SEK 222.6 billion (USD 24.5 billion). The Ericsson stock is listed on Nasdaq Stockholm and on NASDAQ in New York. Read more on www.ericsson.com.

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