IMDEA Networks Institute Digital Repository
Not a member yet
1915 research outputs found
Sort by
From Energy-Efficient Networking to ZEN (Editorial)
No full textEnergy-efficiency has become a hot topic in networking research. Several large international research projects have been activated in recent years on this subject. Examples are GreenTouch [1], conceived at Alcatel Lucent Bell Labs, TREND, EARTH, ECONET, C2POWER, CHRON, STRONGEST, Fit4Green, COST IC 804 [2,3,4,5,6,7,8,9], all funded by the European Commission through its 7th Framework Programme, and many national research projects, such as COOL SILICON in Germany and EFFICIENT in Italy. In addition, most equipment manufacturers feature their own internal research projects on this topic, such as GREAT in Huawei. The objective of all these research efforts consists in the reduction of the energy consumption of data networks, but their targets vary, from the 20% saving in today’s networks quite realistically claimed by TREND, to the reduction by a factor 1000 in future networks somewhat optimistically foreseen by GreenTouch.TRUEpu
TREBOL: Tree-Based Routing and Address Autoconfiguration for Vehicle-to-Internet Communications
Get PDFEfficient vehicle-to-Internet routing and address autoconfiguration are two of the missing pieces required to pro vide
Internet connectivity from vehicles. Here, we propose TREBOL,
a tree-based and configurable protocol which benefits from th e
inherent tree-shaped nature of vehicle to Internet traffic t o reduce
the signaling overhead while dealing efficiently with the ve hicular
dynamics. The paper describes the design and rationale of the
solution, and presents the results of an experimental validation
and performance evaluation, based on extensive simulations and
real vehicular traces obtained in the region of Madrid.TRUEpu
Energy efficient wireless Internet access with cooperative cellular networks
Get PDFIn this paper we study the energy-aware cooperative management of the cellular access networks of the operators that offer service over the same area. In particular, we evaluate the amount of energy that can be saved by using all networks in high traffic conditions, but progressively switching off networks during the periods when traffic decreases, and eventually becomes so low that the desired quality of service can be obtained with just one network. When a network is switched off, its customers are allowed to roam over those networks that remain powered on. Several alternatives are studied, as regards the traffic profile, the switch-off pattern, the energy cost model, and the roaming policy. Numerical results indicate that a huge amount of energy can be saved with an energy-aware cooperative management of the networks, and suggest that, to reduce energy consumption, and thus the cost to operate the networks, new cooperative attitudes of the operators should
be encouraged with appropriate incentives, or even enforced by regulation authorities.TRUEpu
On the Minimization of Power Consumption in Base Stations using on/off Power Amplifiers
Get PDFUsing energy generated with fossil fuel causes global
warming due to the greenhouse effect, which threatens our
environment. One of the challenges for New Generation Networks(NGN) is then the reduction of energy consumption, in particular at the BSs (Base Stations) which use about 85% of the total network energy. We contribute to the research with a mathematical model that calculates the total power consumption of a BS and enlightens the way to minimize it. First, we analyze the power consumed at every different component of the BS. Second, based on the cost incurred in turning off the BS’s power amplifiers, we show how to decide whether it is convenient to keep the BS idle during those intervals in which no traffic has to be sent, or to turn off the amplifiers. Our model is evaluated by
means of numerical examples, and shows that interesting power gain can be obtained under a large spectrum of load conditions.TRUEpu
Flat access and mobility architecture: An IPv6 distributed client mobility management solution
Get PDFBest Paper AwardThe use of centralized mobility management approaches - such as Mobile IPv6 - poses some difficulties to operators of current and future networks, due to the expected large number of mobile users and their exigent demands. All this has triggered the need for distributed mobility management alternatives, that alleviate operators' concerns allowing for cheaper and more efficient network deployments. This paper proposes a distributed mobility solution, based on Mobile IPv6 and the use of Cryptographic Generated Addresses. We analytically compare the solution to Mobile IPv6, and derive in which scenarios it performs best.TRUEpu
IP Flow Mobility in PMIPv6 Based Networks: Solution Design and Experimental Evaluation
Get PDFThe ability of offloading selected IP data traffic from 3G to WLAN access networks is considered a key feature in the upcoming 3GPP specifications, being the main goal to alleviate data congestion in cellular networks while delivering a positive user experience. Lately, the 3GPP has adopted solutions that enable mobility of IP-based wireless devices relocating mobility functions from the terminal to the network. To this end, the IETF has standardized Proxy Mobile IPv6 (PMIPv6), a protocol capable to hide often complex mobility procedures from the mobile devices. This paper, in line with the mentioned offload requirement, further extends PMIPv6 to support dynamic IP flow mobility management across access wireless networks according to operator policies. Considering energy consumption as a critical aspect for hand-held devices and smart-phones, we assess the feasibility of the proposed solution and provide an experimental analysis showing the cost (in terms of energy consumption) of simultaneous packet transmission/reception using multiple network interfaces. The end-to-end system design has been implemented and validated by means of an experimental network setup.FALSEpu
IEEE 802.21: Media independence beyond handover
Get PDFThe IEEE 802.21 standard facilitates media independent handovers by providing higher layer mobility management functions with common service primitives for all technologies. Right after the base specification was published, several voices rose up in the working group advocating to broaden the scope of IEEE 802.21 beyond handovers. This paper aims at updating the reader with the main challenges and functionalities required to create a Media Independence Service Layer, through the analysis of scenarios which are being discussed within the working group: 1) Wireless Coexistence, and 2) Heterogeneous Wireless Multihop Backhaul Networks.TRUEpu
