To evaluate the trail potential of converged heterogeneous network （CHN） market, the logistic method for adoption modeling of CHN is used. User growth ＆ penetration have been taken as two variants to find saturatio...To evaluate the trail potential of converged heterogeneous network （CHN） market, the logistic method for adoption modeling of CHN is used. User growth ＆ penetration have been taken as two variants to find saturation condition in market. Model is continuous in time but modifications are done for discrete recurrence equation, commonly known as logistic map. Dynamic and static phases are taken into consideration while penetration decay is not covered in this model.展开更多
Video streaming,especially hypertext transfer protocol based(HTTP) adaptive streaming(HAS) of video,has been expected to be a dominant application over mobile networks in the near future,which brings huge challenge fo...Video streaming,especially hypertext transfer protocol based(HTTP) adaptive streaming(HAS) of video,has been expected to be a dominant application over mobile networks in the near future,which brings huge challenge for the mobile networks.Although some works have been done for video streaming delivery in heterogeneous cellular networks,most of them focus on the video streaming scheduling or the caching strategy design.The problem of joint user association and rate allocation to maximize the system utility while satisfying the requirement of the quality of experience of users is largely ignored.In this paper,the problem of joint user association and rate allocation for HTTP adaptive streaming in heterogeneous cellular networks is studied,we model the optimization problem as a mixed integer programming problem.And to reduce the computational complexity,an optimal rate allocation using the Lagrangian dual method under the assumption of knowing user association for BSs is first solved.Then we use the many-to-one matching model to analyze the user association problem,and the joint user association and rate allocation based on the distributed greedy matching algorithm is proposed.Finally,extensive simulation results are illustrated to demonstrate the performance of the proposed scheme.展开更多
To meet the explosively increased data traffic demand from 5G and beyond,one of the most promising technologies is densified heterogeneous networks(HetNets).In HetNets,base stations(BSs)are brought closer and closer t...To meet the explosively increased data traffic demand from 5G and beyond,one of the most promising technologies is densified heterogeneous networks(HetNets).In HetNets,base stations(BSs)are brought closer and closer to users by densifying small BSs,which results in considerable high spectral efficiency and energy efficiency for cellular systems.However,HetNet topology challenges the traditional cellular systems.One of the most important challenges is user association.Aiming to avoid the drawback brought by coupled access(CA)in user association of HetNets,a decoupled access(DA)approach has emerged recently.By allowing access points in uplink(UL)and downlink(DL)association to be different,DA significantly improves UL performance of HetNets.This article focuses on recent works in DA.First,typical scenarios of HetNets for DA are described,which is followed by presenting two major decoupled association policies under typical scenarios.Then,DA shows its superiority over CA under different scenarios and decoupled association policies via various performance metrics.Finally,future work on DA in HetNets is discussed.展开更多
基金Supported by the National Natural Science Foundation of China(60772066)
文摘To evaluate the trail potential of converged heterogeneous network （CHN） market, the logistic method for adoption modeling of CHN is used. User growth ＆ penetration have been taken as two variants to find saturation condition in market. Model is continuous in time but modifications are done for discrete recurrence equation, commonly known as logistic map. Dynamic and static phases are taken into consideration while penetration decay is not covered in this model.
基金fully supported under the National Natural Science Funds(Project Number:61501042 and 61302089)National High Technology Research and Development Program(863)of China(Project Number:2015AA016101 and 2015AA015702)BUPT Special Program for Youth Scientific Research Innovation(Grant No.2015RC10)
文摘Video streaming,especially hypertext transfer protocol based(HTTP) adaptive streaming(HAS) of video,has been expected to be a dominant application over mobile networks in the near future,which brings huge challenge for the mobile networks.Although some works have been done for video streaming delivery in heterogeneous cellular networks,most of them focus on the video streaming scheduling or the caching strategy design.The problem of joint user association and rate allocation to maximize the system utility while satisfying the requirement of the quality of experience of users is largely ignored.In this paper,the problem of joint user association and rate allocation for HTTP adaptive streaming in heterogeneous cellular networks is studied,we model the optimization problem as a mixed integer programming problem.And to reduce the computational complexity,an optimal rate allocation using the Lagrangian dual method under the assumption of knowing user association for BSs is first solved.Then we use the many-to-one matching model to analyze the user association problem,and the joint user association and rate allocation based on the distributed greedy matching algorithm is proposed.Finally,extensive simulation results are illustrated to demonstrate the performance of the proposed scheme.
基金The work was supported by the National Natural Science Foundation of China(No.61531011).
文摘To meet the explosively increased data traffic demand from 5G and beyond,one of the most promising technologies is densified heterogeneous networks(HetNets).In HetNets,base stations(BSs)are brought closer and closer to users by densifying small BSs,which results in considerable high spectral efficiency and energy efficiency for cellular systems.However,HetNet topology challenges the traditional cellular systems.One of the most important challenges is user association.Aiming to avoid the drawback brought by coupled access(CA)in user association of HetNets,a decoupled access(DA)approach has emerged recently.By allowing access points in uplink(UL)and downlink(DL)association to be different,DA significantly improves UL performance of HetNets.This article focuses on recent works in DA.First,typical scenarios of HetNets for DA are described,which is followed by presenting two major decoupled association policies under typical scenarios.Then,DA shows its superiority over CA under different scenarios and decoupled association policies via various performance metrics.Finally,future work on DA in HetNets is discussed.
