Browsing by Author "Hu, Heng-Ming"

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Decoupled Rate-Optimal User Association for Full-Duplex Heterogeneous Networks
(2018-01-01)
Hu, Heng-Ming
;
Liu, Chun-Hung
;
電機工程學系
;
Department of Electrical and Computer Engineering
Full-duplex (FD) transmission in a point-to-point (P2P) link, wherein bidirectional traffic flows simultaneously share the same spectrum, has the capability of doubling the link throughput by completely removing self-interferences. However, the throughput gain of FD transmission in an interference-limited network is not as clear as a P2P link due to the interferences induced by complex FD and half-duplex (HD) transmission behaviors in the network. To thoroughly investigate the link throughputs of users and base stations (BSs) in a heterogeneous network (HetNet) with decoupled user association, a general approach is proposed to model a HetNet in which all BSs and users can perform HD or FD transmission depending on their traffic patterns. We first characterize the decoupled rate-optimal user association scheme and use it to define the downlink and uplink throughputs in the HetNet. The tight lower bounds on the link throughputs of the FD users and BSs are found in a neat form that characterizes general channel fading, user and BS intensities and imperfect self-interference cancellation. Numerical results validate that our analytical results are fairly accurate and the proposed decoupled rate-optimal user association indeed significantly improves the link throughputs.
Full-Duplex Heterogeneous Networks With Decoupled User Association: Rate Analysis and Traffic Scheduling
(2019-03-01)
Liu, Chun-Hung
;
Hu, Heng-Ming
;
電機工程學系
;
電信工程研究所
;
Department of Electrical and Computer Engineering
Full-duplex (FD) transmission in a point-to-point (P2P) link, wherein bidirectional traffic flows simultaneously share the same spectrum, has the capability of doubling the link rate by completely removing self-interferences. However, the rate performance of an FD heterogeneous network (HetNet) is not as clear as that of an FD P2P link due to the co-channel interferences induced by the complex FD and half-duplex (HD) transmission behaviors in the HetNet. To thoroughly investigate the achievable link rate performances of users and base stations (BSs) in a HetNet with decoupled user association, a hybrid-duplex approach is proposed to model a HetNet in which all BSs and users can perform HD or FD transmission depending on their traffic patterns. We first characterize the decoupled rate-optimal user association scheme and use it to define and evaluate the downlink and uplink rates in the HetNet. The tight lower bounds on the link rates of the FD users and BSs are found in a neat form that characterizes general channel fading, imperfect self-interference cancellation, and the intensities of users and BSs. These bounds outline the rate regions of the FD users that inspire us to propose the opportunistic FD scheduling algorithms that maximize the sum rate of each bidirectional traffic and stabilize each of the queues in the HetNet.
Full-Duplex Heterogeneous Networks: Ergodic Rate Analysis with Realistic Interference Modeling
(2017-01-01)
Hu, Heng-Ming
;
Liu, Chun-Hung
;
Chang, Kai-Chieh
;
電機工程學系
;
Department of Electrical and Computer Engineering
In this paper, we adopt a realistic approach to modeling a full-duplex heterogeneous cellular network (HetNet) consisting of a tier of small cell base stations (BSs) that can perform half-duplex (HD) or full-duplex (FD) transmission depending on which duplex transmission is needed by their associated users and a tier of macro BSs that only can perform HD transmission due to their strong self-interference (SI). Two realistic issues, void cell and imperfect SI cancellation, that could exist in this HetNet are also considered in the interference model of this two-tier HetNet. We first study the Laplace transforms of the reciprocals of the signal-to-interference power ratios of users and small cell BSs and derive their explicit expressions. These Laplace transforms lead to the derivations of the ergodic rates of users and small cell BSs found in a very compact form for general power-law channel models. We show that FD does not always outperform HD in terms of ergodic rates and demonstrate how to make FD/HD transmission benefits the ergodic rates by deploying macro and small cell BSs with appropriate intensities.
Throughput Region and Scheduling for Full-Duplex HetNets with Decoupled User Association
(2018-01-01)
Liu, Chun-Hung
;
Hu, Heng-Ming
;
電機工程學系
;
Department of Electrical and Computer Engineering
This paper investigates the achievable downlink and uplink throughputs of users in a full-duplex (FD) heterogeneous network (HetNet) where users are allowed to associate with different downlink and uplink base stations (BSs) and adopt FD transmission to handle bidirectional traffic between them and their associated BSs. In order to exploit the downlink and uplink throughput limits, we propose the model of decoupled generalized user association and use it to define the full-duplex signal-to-interference ratio. We derive the decoupled rate-optimal user association (DROA) scheme that is able to make user associate with the BSs that provide them with the maximum downlink and uplink throughputs. For the DROA scheme, the explicit tight lower bounds on the link throughputs of an FD user are found in a neat form that characterizes general channel fading, user and BS intensities and imperfect self-interference cancellation. These bounds delineate the throughput regions of the FD user that inspire proposing the opportunistic FD scheduling algorithms able to maximize the sum throughput of each bidirectional traffic in the HetNet.