To meet the increasing demand of wireless broadband applications in future 5G cellular networks, Device-to-Device(D2D) communications serve as a candidate paradigm to improve spectrum efficiency. Considering the chall...To meet the increasing demand of wireless broadband applications in future 5G cellular networks, Device-to-Device(D2D) communications serve as a candidate paradigm to improve spectrum efficiency. Considering the challenges after D2 D transmission is introduced for future cellular networks, this paper deals with mode selection and resource allocation issues related with D2 D communications. First, we propose a mode selection scheme which aims at guaranteeing the transmission of cellular users and also considering the potential interference. We analyze the condition under which D2 D underlay mode should be used. Second, we answer the question of "how to effectively reuse cellular resource once underlaying mode is adopted". We further present a resource allocation scheme that focuses on minimizing overall interference as well as a power control method to improve the performance of D2 D systems. Simulation results demonstrate that system parameters greatly affect the switching condition of mode selection and probability of choosing underlay mode. Furthermore, for D2 D underlaying scenario, the proposed resource allocation algorithm guarantees the transmission of cellular users with consideration of transmission requirements of D2 D users. Hence, the proposed scheme can achieve better user experience.展开更多
The year of 2014 saw the beginning of China's LTE,which marks that China has become one of the major engines for the global LTE development.China dazzled in the construction of LTE networks,subscribers,and industr...The year of 2014 saw the beginning of China's LTE,which marks that China has become one of the major engines for the global LTE development.China dazzled in the construction of LTE networks,subscribers,and industry chain.However,the policy formulated around TD-LTE also put China in predicament and brought it many challenges.With this article,we are going to put China's market for mobile broadband networks into perspective,focusing on the development of China's LTE market,challenges that encountered,and the research in this area in the years to come.Besides,in regards to the problems that already appeared,we will,from policy-making,industry-level,and technological points of view,offer our suggestions on how China should do to make this market robust.展开更多
The article explains the role and future trend of IT industry,and states that information technology represented by the Internet and computers has brought about the third industrial revolution in history.An important ...The article explains the role and future trend of IT industry,and states that information technology represented by the Internet and computers has brought about the third industrial revolution in history.An important impetus for economic growth in modern times,the IT industry has greatly promoted sustainable development and is profoundly changing mankind's way of life and production.In discussing the development trend of world IT industry,the article suggests that with potential new breakthroughs in information technology,the trend of agglomeration and integration of industries has become increasingly obvious,competition of intellectual properties and standards is intensifying and ubiquitous network is taking shape.It points out that China should bring into better play the role of IT industry as an'amplifier'in economic growth,a'transformer'in development mode and a'propeller'in industrial upgrading.It is important to follow a policy that emphasizes independent innovation,market-driven approach,open and compatible technologies,integrated and comprehensive applications, and serving both military and civil purposes,so that a quantum leap of IT industry will be achieved.China should advance industrialization with information technologies and promote the IT industry in the course of industrialization in an effort to build an IT industry with Chinese characteristics.Greater efforts should be made to develop such core sectors as microelectronics,computer,software,key components and materials,as well as sectors with international competitiveness,including broadband mobile communication,next-generation network and information services.Continued improvement should be made in policies guiding the development of IT industry with a view to making China a country with a strong IT industry by 2020.展开更多
基金supported by the National Natural Science Foundation of China(No.61501371)National 863 High Tech R&D Program of China(project number:2014AA01A703)+1 种基金National Science and Technology Major Project of the Ministry of Science and Technology of China(project number:2014ZX03001025-006)The international Exchange and Cooperation Projects of Shaanxi Province(project number:2016KW-046)
文摘To meet the increasing demand of wireless broadband applications in future 5G cellular networks, Device-to-Device(D2D) communications serve as a candidate paradigm to improve spectrum efficiency. Considering the challenges after D2 D transmission is introduced for future cellular networks, this paper deals with mode selection and resource allocation issues related with D2 D communications. First, we propose a mode selection scheme which aims at guaranteeing the transmission of cellular users and also considering the potential interference. We analyze the condition under which D2 D underlay mode should be used. Second, we answer the question of "how to effectively reuse cellular resource once underlaying mode is adopted". We further present a resource allocation scheme that focuses on minimizing overall interference as well as a power control method to improve the performance of D2 D systems. Simulation results demonstrate that system parameters greatly affect the switching condition of mode selection and probability of choosing underlay mode. Furthermore, for D2 D underlaying scenario, the proposed resource allocation algorithm guarantees the transmission of cellular users with consideration of transmission requirements of D2 D users. Hence, the proposed scheme can achieve better user experience.
文摘The year of 2014 saw the beginning of China's LTE,which marks that China has become one of the major engines for the global LTE development.China dazzled in the construction of LTE networks,subscribers,and industry chain.However,the policy formulated around TD-LTE also put China in predicament and brought it many challenges.With this article,we are going to put China's market for mobile broadband networks into perspective,focusing on the development of China's LTE market,challenges that encountered,and the research in this area in the years to come.Besides,in regards to the problems that already appeared,we will,from policy-making,industry-level,and technological points of view,offer our suggestions on how China should do to make this market robust.
文摘The article explains the role and future trend of IT industry,and states that information technology represented by the Internet and computers has brought about the third industrial revolution in history.An important impetus for economic growth in modern times,the IT industry has greatly promoted sustainable development and is profoundly changing mankind's way of life and production.In discussing the development trend of world IT industry,the article suggests that with potential new breakthroughs in information technology,the trend of agglomeration and integration of industries has become increasingly obvious,competition of intellectual properties and standards is intensifying and ubiquitous network is taking shape.It points out that China should bring into better play the role of IT industry as an'amplifier'in economic growth,a'transformer'in development mode and a'propeller'in industrial upgrading.It is important to follow a policy that emphasizes independent innovation,market-driven approach,open and compatible technologies,integrated and comprehensive applications, and serving both military and civil purposes,so that a quantum leap of IT industry will be achieved.China should advance industrialization with information technologies and promote the IT industry in the course of industrialization in an effort to build an IT industry with Chinese characteristics.Greater efforts should be made to develop such core sectors as microelectronics,computer,software,key components and materials,as well as sectors with international competitiveness,including broadband mobile communication,next-generation network and information services.Continued improvement should be made in policies guiding the development of IT industry with a view to making China a country with a strong IT industry by 2020.
