17 documents found, page 1 of 2
Some initial results and observations from a series of trials within the Ofcom ...
Holland, Oliver; Ping, Shuyu; Sastry, Nishanth; Chawdhry, Pravir; Chareau, Jean-Marc; Bishop, James; Xing, Hong; Taskafa, Suleyman; Aijaz, AdnanTV White Spaces (TVWS) technology allows wireless devices to opportunistically use locally-available TV channels enabled by a geolocation database. The UK regulator Ofcom has initiated a pilot of TVWS technology in the UK. This paper concerns a large-scale series of trials under that pilot. The purposes are to test aspects of white space technology, including the white space device and geolocation database inte...
Dynamic Configuration and Optimization of WiMAX Networks with Relay Power Savin...
Robalo, Daniel; Oliveira, João R.; Velez, Fernando J.; Holland, Oliver; Aghvami, A. HamidThis paper investigates the performances achievable by WiMAX networks deployed in various sectorization configurations, with and without relay stations (RSs). Further, it studies the dynamic adjustment of the configuration to serve traffic loads at different times of the day while maximising the use of opportunistic sleep modes by relays in conjunction with cell zooming, thereby saving energy. The configuration...
A series of trials in the UK as part of the Ofcom TV white spaces pilot
Holland, Oliver; Sastry, Nishanth; Ping, Shuyu; Knopp, Raymond; Kaltenberger, Florian; Nussbaum, Dominique; Hallio, Juhani; Jakobsson, MikkoTV White Spaces technology is a means of allowing wireless devices to opportunistically use locally-available TV channels (TV White Spaces), enabled by a geolocation database. The geolocation database informs the device of which channels can be used at a given location, and in the UK/EU case, which transmission powers (EIRPs) can be used on each channel based on the technical characteristics of the device, give...
Cost/revenue performance in an IMT-Advanced scenario with Spectrum Aggregation ...
Acevedo Flores, Jessica Elizabeth; Velez, Fernando J.; Cabral, Orlando; Robalo, Daniel Luís Silveira; Holland, Oliver; Aghvami, A. HamidThis paper determines the cost/revenue performance of a mobile communication system in an IMT-Advanced scenario with integrated Common Radio Resource Management (iCRRM). The iCRRM performs classic CRRM functionalities jointly with Spectrum Aggregation (SA), being able to switch users between non-contiguous frequency bands. The SA scheduling is obtained with an optimized General Multi-Band Scheduling (GMBS) algo...
Energy saving in the optimization of the planning of fixed WiMAX with relays in...
Velez, Fernando J.; Oliveira, João; Robalo, Daniel Luís Silveira; Holland, Oliver; Aghvami, A. HamidLayered and cooperative elements such as femto-cells and relays can improve performance or energy efficiency in mobile networks; however, they consume energy per se and their durations in operational state must therefore be minimised. This paper investigates the use of relays in WiMAX network deployments and concentrates on the cost/revenue performance and energy efficiency trade-off in such cases. Specifically...
Cost/revenue optimization of WiMAX networks with relay power saving modes: Meas...
Velez, Fernando J.; Oliveira, João; Robalo, Daniel; Holland, Oliver; Aghvami, HamidThis paper investigates cell zooming and relaying in conjunction with the use of opportunistic sleep modes to save energy at times of low load in WiMAX network deployments. It performs extensive propagation measurements in a hilly area of Covilhã, Portugal, in order to present a realistic and topographically challenging scenario in which to perform dynamic optimizations. It describes these measurements and thei...
Cognitive radio for medical body area networks using ultra wideband
Chavez-Santiago, Raul; Nolan, Keith E.; Holland, Oliver; De Nardis, Luca; Ferro, João M.; Barroca, Norberto; Borges, Luís M.; Velez, Fernando J.Wearable wireless medical sensors beneficially impact the healthcare sector, and this market is experiencing rapid growth. In the United States alone, the telecommunications services market for the healthcare sector is forecast to increase from $7.5 billion in 2008 to $11.3 billion in 2013. Medical body area networks improve the mobility of patients and medical personnel during surgery, accelerate the patients’...
Pluralistic licensing
Holland, Oliver; De Nardis, Luca; Nolan, Keith; Medeisis, Arturas; Anker, Peter; Minervini, Leo Fulvio; Velez, Fernando; Matinmikko, Marja; Sydor, JohnWe introduce the concept of “pluralistic licensing”, which we describe as the award of licenses under the assumption that opportunistic secondary spectrum access will be allowed, and that interference may be caused to the primary with parameters and rules that are known to the primary at the point of obtaining the license. A key aspect of the concept is that the primary will choose from a range of offered “plur...
Opportunistic spectrum and load management for green radio networks
Holland, Oliver; Facchini, Christian; Aghvami, A. Hamid; Cabral, Orlando Manuel Brito; Velez, FernandoIntroduction Historically, the radio spectrum has been managed in a rather rigid fashion where systems have been constrained to very specific bands in order to avoid interference and maintain the spectrum's viability. This regime is extremely inefficient, because at any one time many systems are not being used thereby leaving their associated spectrum also unused. Alternative spectrum management, where systems ...
Cost/Revenue Tradeoff in the Optimization of Fixed WiMAX Deployment With Relays
Velez, Fernando J.; Nazir, Muhammad Kashif; Aghvami, A. Hamid; Holland, Oliver; Robalo, DanielIn fixed Worldwide Interoperability for Microwave Access (WiMAX), the contribution from each transmission mode can be incorporated into an implicit formulation to obtain the supported throughput as a function of the carrier-to-interference ratio. This is done by weighting the physical throughput in each concentric coverage ring by the size of the ring. In this paper, multihop cells are formed by a central cover...