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Conventional planning and optimization of cellular networks for supporting the peak-time user demand leads to substantial wastage of electrical energy. Therefore, we propose an energy-aware dynamic network provisioning framework for realizing green mobile cellular systems by reducing energy consumption in access networks. Proposed mechanism allows base stations (BSs) to offload their entire traffic...
This paper studies user-centric cluster scheme in cloud radio access network (Cloud-RAN), where distributed Radio Remote Heads (RRHs) are connected to a centralized Based Band Units (BBUs) pool and all baseband processing is performed via high-bandwidth low-latency backhaul network. In user-centric cluster scheme, BBU schedules multiple RRHs for each user to form the serving cluster, and then BBU...
Reliability, interoperability and efficiency are fundamental in Wireless Sensor Network deployment. Herein we look at how transmission power control may be used to reduce interference, which is particularly problematic in high-density conditions. We adopt a distributed approach where every node has the ability to learn which transmission power is most appropriate, given the network conditions and...
In this paper, we presented a fairness-aware scheduling scheme in OFDM-based cognitive radio networks. Our objective is to maximize the systems energy efficiency while maintain the fairness among secondary users. In addition, many factors will be considered such as the channel quality, the interferences taken to the primary system and the total transmission power of the cognitive radio system. The...
This paper presents the performance of scheduling for adaptive modulation and coding based on the dynamic margin control. To cover various wireless channel conditions and requirements for multimedia traffic QoS, the selection of suitable MCS (Modulation and Coding Scheme) is important technique in real deployment and management fields. In this paper, we propose dynamic margin control schemes based...
In this paper, we propose a new routing algorithm which calculates bandwidth-delay constrained routes in the fast and efficient manner. The algorithm is designed for the software-defined backbone networks, where the control plane is separated from the data plane and logically centralized. Besides providing the required quality of service (QoS), the algorithm aims to maximize utilization of network...
In this paper, we model and analyze the resource management problem of energy harvesting-based underlaying device-to-device (D2D) communication in uplink cellular networks (CNs). D2D transmitter can harvest energy from ambient inter- ference and reuse the spectrum of the cellular users (CUs) to com- municate with corresponding receiver. The energy of transmitters comes form the mix of the harvested...
In this paper, we propose a novel deferred acceptance based resource allocation algorithm (DARA) for allocating LTE cellular user resource to D2D devices. The quality of service (QoS) constrained downlink resource block (RB) allocation problem is first formulated as a computationally expensive mixed integer nonlinear programming (MINLP) problem. We also propose a polynomial-time matching algorithm...
Allowing Secondary Users (SUs) to access the licensed spectrum without causing harmful interference to the Primary Users (PUs) is crucial in enabling the Cognitive Radio (CR) technology. In order to increase the utilization of the spectrum bands, we propose a Dynamic Spectrum Allocation (DSA) algorithm that integrates both interweave and underlay spectrum access schemes. The proposed algorithm will...
In this paper we compare three novel schemes for dynamic frequency allocation and transmission power assignment for cognitive radio networks. These spectrum allocation schemes are based on reinforcement learning and power optimization procedures. We propose the so-called RL+Power and RL+Power Coupled schemes and compare them with an existing constant power scheme. Simulation results show that the...
In Heterogeneous Networks (HetNets), Almost Blank Subframe (ABS) can provide interference free communication to the Cell Range Expansion (CRE) area users. Although the CRE technique is simple and guarantees a better offloading, it might not be the best way for balancing the load. In this paper, we investigate the joint optimization of the user association and the ABS ratio computation. We propose...
A joint channel assignment and power allocation algorithm is presented for cognitive wireless networks, where primary and secondary users operate over the same frequency band at the same time. In this study, we take into consideration a constraint on the interference from secondary users towards primary users, as well as a constraint on the QoS of secondary users. The problem is formulated as a constrained...
Network virtualization (NV) is a promising solution for higher resource utilization, improved system performance, and lower investment capitals for network operators. Spectrum sharing is an important issue for NV in the wireless networks. Meanwhile, the scheme of Almost Blank Subframe (ABS) causes new challenge for NV in the heterogeneous cellular networks (HetNet). This paper aims at investigating...
Dense deployment of femtocell networks in local area is an evolutional trend of cellular networks due to the exponential increasement of traffic demand. In the dense deployment scenario where radio spectrum becomes a resource bottleneck due to its scarcity, dynamic, scalable and self-configured spectrum allocation schemes are of substantial importance. Meanwhile, quality of service (QoS) is always...
In multiple hops network, there would be competition among the Peer to Peer (P2P) links when the amount of the P2P links was large. This paper proposed a novel dynamic channel allocation (DCA) algorithm based on ant colony intelligence (ACI) to solve the problem of multi-hop network competition among the P2P links. Theory analysis showed than the shorter of the average length of the routes of the...
The dynamic adjustment of TDD UL-DL configuration based on the instantaneous traffic conditions can be an effective way to optimize the system performance. Small cells in LTE heterogeneous network are considered to be one of the candidates for the dynamic adjustment. In this paper, we focus on UL-DL reconfiguration algorithms to conduct the dynamic adjustment, where the QoS requirement differences...
Device-to-device (D2D) communications as an underlaying LTE-Advanced network has proven to be efficient in improving the network performance and releasing the traffic load of eNodeB. By sharing radio resource with cellular user equipments (CUEs), D2D communications can significantly enhance the overall spectral efficiency. However, the resulting mutual interference may cancel or even outweigh the...
With enormous growth in the telecommunication industry, energy efficiency has become a critical issue. Base stations and the core network account for a large amount of energy consumption today. Traditional energy saving techniques switch some base stations off completely during light loads to save energy. This creates problems for the backhaul network and also for quickly returning to full capacity...
Private Mobile Radio (PMR) networks are cellular infrastructures dedicated to be used by professionals, such as public safety, military, industry and transportation organizations. In those networks, resources are scarce, and there are strong Quality of Service (QoS) requirements. The emergence of new services which need more bandwidth has made the world PMR leader focus on the LTE-Advanced protocol...
The introduction of femtocells brings more interference to cellular system, setting threshold to femtocell users' transmit power can control it effectively. To control the interference from femtocell users to macro base station and guarantee the QOS and maximize system capacity, this paper develops the uplink power control algorithm of femtocell system based on threshold and water- filling theorem...
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