3 research outputs found
An Economic Aspect of Device-to-Device Assisted Offloading in Cellular Networks
Traffic offloading via device-to-device (D2D) communications
has been proposed to alleviate the traffic burden
on base stations (BSs) and to improve the spectral and energy
efficiency of cellular networks. The success of D2D communications
relies on the willingness of users to share contents. In
this paper, we study the economic aspect of traffic offloading via
content sharing among multiple devices and propose an incentive
framework for D2D assisted offloading. In the proposed incentive
framework, the operator improves its overall profit, defined as
the network economic efficiency (ECE), by encouraging users
to act as D2D transmitters (D2D-Txs) which broadcast their
popular contents to nearby users. We analytically characterize
D2D assisted offloading in cellular networks for two operating
modes: 1) underlay mode and 2) overlay mode. We model the
optimization of network ECE as a two-stage Stackelberg game,
considering the densities of cellular users and D2D-Tx’s, the
operator’s incentives and the popularity of contents. The closedform
expressions of network ECE for both underlay and overlay
modes of D2D communications are obtained. Numerical results
show that the achievable network ECE of the proposed incentive
D2D assisted offloading network can be significantly improved
with respect to the conventional cellular networks where the D2D
communications are disabled
An Economic Aspect of Device-to-Device Assisted Offloading in Cellular Networks
Traffic offloading via device-to-device (D2D) communications
has been proposed to alleviate the traffic burden
on base stations (BSs) and to improve the spectral and energy
efficiency of cellular networks. The success of D2D communications
relies on the willingness of users to share contents. In
this paper, we study the economic aspect of traffic offloading via
content sharing among multiple devices and propose an incentive
framework for D2D assisted offloading. In the proposed incentive
framework, the operator improves its overall profit, defined as
the network economic efficiency (ECE), by encouraging users
to act as D2D transmitters (D2D-Txs) which broadcast their
popular contents to nearby users. We analytically characterize
D2D assisted offloading in cellular networks for two operating
modes: 1) underlay mode and 2) overlay mode. We model the
optimization of network ECE as a two-stage Stackelberg game,
considering the densities of cellular users and D2D-Tx’s, the
operator’s incentives and the popularity of contents. The closedform
expressions of network ECE for both underlay and overlay
modes of D2D communications are obtained. Numerical results
show that the achievable network ECE of the proposed incentive
D2D assisted offloading network can be significantly improved
with respect to the conventional cellular networks where the D2D
communications are disabled
Study of Device-to-Device communication : analysis of spectral efficiency, energy efficiency and transport capacity
Orientador: Paulo CardieriDissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de ComputaçãoResumo: O modo de comunicação Device-to-Device (D2D) possibilita que dois terminais de uma rede celular se comuniquem entre si diretamente, sem o envolvimento da estação rádio-base na transmissão da mensagem. Este modo de comunicação possibilita aumentar a eficiência espectral, diminuir a latência e incrementar a eficiência energética da comunicação. Por esses motivos, a comunicação D2D tem sido proposta como uma das tecnologias que comporão os sistemas de quinta geração de comunicação celular (5G). Nesse trabalho, apresenta-se um estudo do desempenho do modo de comunicação D2D em um cenário em que terminais operando no modo D2D compartilham o canal de comunicação com terminais operando no modo celular convencional (isto é, conectados a estações rádio-base), com os terminais de ambas as redes provocando interferência mútua. O estudo foca na otimização da eficiência espectral e da eficiência energética da rede D2D, impondo-se a restrição de que qualquer alteração na rede D2D deve manter invariante a interferência causada pela rede D2D nas transmissões da rede celular. Usando elementos de Geometria Estocástica para a modelagem das redes, são derivadas expressões para os valores ótimos da densidade de terminais, da potência de transmissão e da taxa de transmissão da rede D2D que maximizam ou a eficiência espectral ou a eficiência energética da rede. Tais expressões dos valores ótimos possibilitam o entendimento da influência de diversos parâmetros das redes no desempenho da rede D2D e dos compromissos resultantes. Finalmente, se analisa a capacidade de transporte da rede D2D, sem, no entanto, impor que a interferência gerada pela rede D2D sobre a rede celular permanece invariante. O estudo da capacidade de transporte permite encontrar a distância máxima do enlace D2D que otimiza esta métricaAbstract: Device-to-device (D2D) communication allows two terminals of a cellular network to communicate directly with each other, without involving any base station in the communication process. This mode of communication may enhance the network spectral efficiency, reduce latency and increase the energy efficiency. For these and other reasons, D2D communication has been proposed as one of the technologies to be considered in the Fifth Generation of cellular communication systems (5G). In this work, we study of the performance of the D2D communication strategy in a scenario in which terminals operating in the D2D mode share the communication channel with terminals operating in the conventional cellular mode (i.e., connected to base stations), causing interference to each other. The study focuses on the optimization of the spectral efficiency and energy efficiency of the D2D network, imposing the restriction that any change in the D2D network should keep invariant the interference caused by the D2D network to cellular links. Using elements of Stochastic Geometry for network modeling, expressions are derived for the optimum values of D2D network density, transmission power and transmission rate that maximize either the spectral efficiency or the energy efficiency of the network. These expressions of the optimal values allow the understanding of the influence of several network parameters on the performance of the D2D network and the resulting trade-offs. Also, in this study we optimize the transport Capacity in respect to the distance of the D2D link, however, in this case we don't assure that the interference caused by the D2D network to cellular links keeps invariantMestradoTelecomunicações e TelemáticaMestra em Engenharia ElétricaCAPE