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With the growing demand on wireless multimedia services and omnipresent access, the energy consumption rises sharply. Consequently, energy efficiency (EE) has become an essential problem in the design of green radio. In order to reduce computational complexity, we separate the resource allocation into two steps: subcarrier allocation and power allocation. After subcarrier allocation, we adopt biogeography-based...
As the evolution of cloud radio access networks (CRANs), heterogeneous cloud radio access networks (H- CRANs) are now recognized as promising paradigm to achieve high spectral and energy efficiency through taking advantages of both heterogeneous networks and C- RANs. In H-CRANs, the heterogeneous processing node (HPN) guarantees the basic quality of service (QoS) requirement for the user equipment,...
In this paper, a novel idea for rate allocation combining both vertical coupling and horizontal coupling constraints is proposed, and a unified utility function to balance two paradoxical issues: efficiency and fairness, revenue and cost is elaborated in WCDMA networks. Then, the optimal rate allocation problem is formulated as a network utility maximization (NUM) model based on cross-layer design...
Incorporating cloud computing into heterogeneous networks, the heterogeneous cloud radio access network (H-CRAN) has been proposed as a promising paradigm to enhance both spectral and energy efficiencies. Developing interference suppression strategies is critical for suppressing the inter-tier interference between remote radio heads (RRHs) and a macro base station (MBS) in H-CRANs. In this paper,...
Energy-efficient communication has attracted more and more attention due to the large energy consumption in wireless communication network. Relay-assisted OFDM cellular network is one of the most effective frameworks in the IMT-Advanced system to improve the spectral efficiency. This paper investigates the energy-efficient resource allocation for multiuser two-way multi-relay OFDM network. We formulate...
The dynamic bandwidth allocation providing QoS for VSAT satellite network was investigated. Two bandwidth reservation allocation schemes were presented. These schemes aim at satisfying different QoS requirement and application scenario. And they can afford more bandwidth requests of applications with less bandwidth available. They efficiently manage the bandwidth pool and improve the utilization of...
We discuss the dynamic bandwidth allocation schemes in TDMA uplink channel of satellite networks. And a scheme based on max-min fairness is discussed and implemented in Tdma-bod simulator of ns-2. Simulation results show that this scheme can improve the throughput and delay performance and provide better QoS for satellite system. And in future network scenario that including more burst traffic and...
Cognitive radio network is expected to solve the spectrum scarcity by enabling unlicensed secondary users (SUs) to opportunistically utilize the licensed spectrum unused by primary users (PUs). In this paper, we propose an optimal admission control scheme which maximizes the profit while guaranteeing QoS of the PUs. The profit maximization problem is formulated as a Semi-Markov Decision Process (SMDP)...
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