Device-to-device (D2D) communications underlaying a cellular infrastructure has been proposed as a means of taking advantage of the physical proximity of communicating devices, increasing resource utilization, and improving cellular coverage. Relative to the traditional cellular methods, there is a need to design new peer discovery methods, physical layer procedures, and radio resource management algorithms that help realize the potential advantages of D2D communications. In this article we use the 3GPP Long Term Evolution system as a baseline for D2D design, review some of the key design challenges, and propose solution approaches that allow cellular devices and D2D pairs to share spectrum resources and thereby increase the spectrum and energy efficiency of traditional cellular networks. Simulation results illustrate the viability of the proposed design.
Harvesting energy from ambient sources makes perpetual off-grid devices a possibility.
SIME London 2012 was all about digital opportunities. We caught up with some of the participants, and asked about the most exciting opportunities available today. Their answers may surprise you.
Vodafone Spain collaborates with competitors to launch superior services that span all networks, operators and devices.
En el filme más reciente sobre la Sociedad Conectada, diversos pensadores líderes en temas urbanos, incluidos Carlo Ratti, Director de MIT SENSEable City Lab, y Mathieu Lefevre, Executive Director de New Cities Foundation, debaten los desafíos y oportunidades que enfrenta la ciudad del siglo XXI y como las TIC están ayudando a conseguir soluciones sostenibles.
In the latest Networked Society film, various leading city-thinkers – including Carlo Ratti, Director of the MIT SENSEable City Lab, and Mathieu Lefevre, Executive Director of the New Cities Foundation – discuss the challenges and opportunities facing the 21st century city and how ICT is helping achieve sustainable solutions.
By significantly raising the quality of voice communication with more natural sound and improved intelligibility, HD voice will play a key role in ensuring that voice continues to offer value for operators and users of both fixed and mobile networks.
By 2020, Ericsson envisions there will be more than 50 billion connected devices. A significant number of these devices will be machine-to-machine (M2M) and connected consumer electronics (CCE), using mobile networks for data communications.