Contention Resolution Queues for Massive Machine Type Communications in LTE

In this paper, we address the challenge of high device density performing simultaneous transmissions by proposing and evaluating a solution to efficiently handle the initial access contention for highly dense LTE networks. We present the implementation of a tree-splitting algorithm in the access procedure of LTE, which is capable to cope with high number of simultaneous arrivals. Based on simulations we show a feasible implementation capable to achieve, under certain network configuration conditions, up to 85% average access delay reduction and 40% reduction on the average energy consumption, while maintaining a consistently low blocking probability, regardless of the number of initial simultaneous access attempts

Business Case and Technology Analysis for 5G Low Latency Applications

A large number of new consumer and industrial applications are likely to change the classic operator's business models and provide a wide range of new markets to enter. This article analyses the most relevant 5G use cases that require ultra-low latency, from both technical and business perspectives. Low latency services pose challenging requirements to the network, and to fulfill them operators need to invest in costly changes in their network. In this sense, it is not clear whether such investments are going to be amortized with these new business models. In light of this, specific applications and requirements are described and the potential market benefits for operators are analysed. Conclusions show that operators have clear opportunities to add value and position themselves strongly with the increasing number of services to be provided by 5G.Comment: 18 pages, 5 figure

Fifth-Generation Technologies for the Connected Car:Capable Systems for Vehicle-to-Anything Communications

Two strong technology trends, one in the mobile communications industry and the other in the automotive industry, are becoming interwoven and will jointly provide new capabilities and functionality for upcoming intelligent transport systems (ITSs) and future driving. The automotive industry is on a path where vehicles are continuously becoming more aware of their environment due to the addition of various types of integrated sensors. At the same time, the amount of automation in vehicles increases, which, with some intermediate steps, will eventually culminate in fully automated driving without human intervention. Along this path, the amount of interactions rises, both in-between vehicles and between vehicles and other road users, and with an increasingly intelligent road infrastructure. As a consequence, the significance and reliance on capable communication systems for vehicleto-anything (V2X) communication is becoming a key asset that will enhance the performance of automated driving and increase further road traffic safety with combination of sensor-based technologies [1]

Correction to:A two million year record of low-latitude aridity linked to continental weathering from the Maldives (Progress in Earth and Planetary Science, (2018), 5, 1, (86), 10.1186/s40645-018-0238-x)

In the original version of this article (Kunkelova et al. 2018), published on 18 December 2018, there was 1 error in the author name of Dr. Yu

A two million year record of low-latitude aridity linked to continental weathering from the Maldives

Tem uma correção em http://hdl.handle.net/10400.1/12390Indian-Asian monsoon has oscillated between warm/wet interglacial periods and cool/dry glacial periods with periodicities closely linked to variations in Earth’s orbital parameters. However, processes that control wet versus dry, i.e. aridity cyclical periods on the orbital time-scale in the low latitudes of the Indian-Asian continent remain poorly understood because records over millions of years are scarce. The sedimentary record from International Ocean Discovery Program (IODP) Expedition 359 provides a well-preserved, high-resolution, continuous archive of lithogenic input from the Maldives reflecting on low-latitude aridity cycles. Variability within the lithogenic component of sedimentary deposits of the Maldives results from changes in monsoon-controlled sedimentary sources. Here, we present X-ray fluorescence (XRF) core-scanning results from IODP Site U1467 for the past two million years, allowing full investigation of orbital periodicities. We specifically use the Fe/K as a terrestrial climate proxy reflecting on wet versus dry conditions in the source areas of the Indian-Asian landmass, or from further afield. The Fe/K record shows orbitally forced cycles reflecting on changes in the relative importance of aeolian (stronger winter monsoon) during glacial periods versus fluvial supply (stronger summer monsoon) during interglacial periods. For our chronology, we tuned the Fe/K cycles to precessional insolation changes, linking Fe/K maxima/minima to insolation minima/maxima with zero phase lag. Wavelet and spectral analyses of the Fe/K record show increased dominance of the 100 kyr cycles after the Mid Pleistocene Transition (MPT) at 1.25 Ma in tandem with the global ice volume benthic δ18O data (LR04 record). In contrast to the LR04 record, the Fe/K profile resolves 100-kyr-like cycles around the 130 kyr frequency band in the interval from 1.25 to 2 million years. These 100-kyr-like cycles likely form by bundling of two or three obliquity cycles, indicating that low-latitude Indian-Asian climate variability reflects on increased tilt sensitivity to regional eccentricity insolation changes (pacing tilt cycles) prior to the MPT. The implication of appearance of the 100 kyr cycles in the LR04 and the Fe/K records since the MPT suggests strengthening of a climate link between the low and high latitudes during this period of climate transition.SFRH/BPD/96960/2013; PTDC/MAR-PRO/3396/2014info:eu-repo/semantics/publishedVersio

Tele-economics in MTC : what numbers would not show

This paper elaborates on the relevance of Tele-Economic research to understand the effect that Machine-Type Commu- nications (MTC) has on different markets and also the market forces affecting the adoption of services based on MTC. The paper is presented in a tutorial form, offering concept and definitions of economic terms that are gaining relevance in the technical community in the MTC context. The concept of services is further analysed in as a change in the tele- communication industry mind-set in order to tap into the economic value of MTC in the realization of the Internet-of- Things. Finally, insights are presented looking forward into the relevance of Tele-Economic research for 5G.QC 20160219</p

Business model as relational aggregator: exploring business relationship

Bringing up services based on Information and Communication Technologies shows to be a complex process for everyone involved in it. Dynamic ecosystem of businesses participating in creation of the value proposition of the services requires a specific way of reasoning and simplified guidance to implementation. We discuss how industrial relationships evolve in terms of value dimensions, through a lens of a business model. This discussion has been done through four streams of literature starting from Activities, Resources and Actors Model and value literature, and continues through value networks and ecosystem literature, so as to round up in discussion on different views on business models. Out of this discussion a conceptual framework has been presented. On the other side, we present basis for the division of the analysis of services based on ICT into two different views and actually offer a table of separation of concerns (into these two views)

6G Drivers for B2B Market

This chapter discusses in detail the use cases and relative performance requirements envisioned for 6th generation (6G) wireless networks, with a focus on the business‐to‐business (B2B) markets. Starting from the verticals identified for 5th generation communication systems, the chapter sheds light on the services that will (i) cater the new industrial revolution through cyber physical systems, (ii) facilitate real‐time digital delivery of life‐sized three‐dimensional stereoscopic experiences and/or objects via teleporting and digital twin, (iii) evolve the automotive industry through intelligent transportation, (iv) provide secure and ultralow‐latency connectivity for critical information in the financial sector and public safety environments, (v) support health and well‐being via telemedicine and efficient and affordable patient access to health assistance, and (vi) improve life quality, environmental monitoring, and city management automation via Internet of Things (IoT) and smart city paradigms. For each use case, this chapter analyses the 6G ecosystem's evolutions that are needed and drafts the key performance indicators (KPIs) to be satisfied in terms of latency, energy consumption, development and deployment costs, computational complexity, and throughput