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In this paper, we propose a low complexity Dynamic Hybrid Clustering (DHC) scheme for LTE-A networks employing Coordinated MultiPoint with Dynamic Point Selection (CoMP-DPS). Although CoMP-DPS is considered to be a simpler CoMP scheme, its simplicity allows us to define more efficient cell clustering procedures. Thus, DHC is able to provide backhaul load balancing for the eNBs while offering high...
To reduce the energy consumption in heterogeneous 5G access networks, we propose a cooperative energy-saving mechanism based on user association (UA-CESM). Joint processing (JP) and centralized resource scheduling are introduced into the mechanism to solve inadequate coverage problem caused by base-station (BS) dormancy by means of cooperative BS selection and BS state control. First, the number of...
Due to the requirement of high capacity to access broadband service as well as high spectrum efficiency, the frequency reuse of one is targeted to be applied in LTE network planning. But it can lead to a worse inter-cell interference levels experienced especially by users located at the cell edge area. Soft Frequency Reuse (SFR) is considered as an effective frequency reuse scheme for inter-cell interference...
The LTE-Advanced HetNets deployment is meant to address the increasing demand for quality of service (QoS), high data rates, and coverage extension to mobile users especially in hotspot areas. One of the main challenges of the deployment, where different network tiers share spectrum, is how users associate with the cells to achieve load balancing for improving system performance. The importance of...
Importance of wireless M2M (machine-to-machine) applications is rapidly increasing, and more effective interference management of large-scale ad hoc networks becomes essential. Study on the properties of interference in multi-hop ad hoc network and effective use of interference canceller is promising to achieve better performance. In this paper, an intra-flow interference canceller with a slotted...
Dynamic TDD is one important feature of 3GPP Release 12. In parallel with the 3GPP standardization, a testbed has been developed to verify the feasibility of dynamic TDD and evaluate the performance in different scenarios. Both dynamic-TDD capable UE and eNode B have been developed. Fast TDD configuration using explicit physical layer signaling has been successfully implemented and over the air measurements...
Cell Outage Compensation (COC) is a self-healing functionality in the overall Self-Organizing Networks vision, which is defined by 3GPP. The Operation Administration and Maintenance system triggers the COC for mitigating the outage problem, e.g. out-of-service cell, by providing an adequate level of service to the affected users in the outage cell. We propose an outage compensation algorithm based...
Energy efficiency in future green cellular wireless networks poses a challenge to operators and researchers. An effective method of providing energy savings (ES) in base stations (BSs) is to switch off idle BSs or put them into sleep mode and subsequently migrate the traffic loads to active BSs in their neighborhood. The intrinsic issue related to such methods applied to heterogeneous networks (HetNets)...
A Body Area Network (BAN) is a radio interface standard for wireless connectivity of wearable and implantable sensors located inside or in close proximity to the human body. Medical applications requirements impose stringent constraints on the reliability, and quality of service performance in these networks. Interference from other co-located BANs or nearby devices that share the same spectrum could...
In order to estimate the DL cell average throughput of LTE network, the paper proposes an algorithm of LTE throughput based on MCS level distribution which can be used to estimate the DL cell capacity under different load conditions. The algorithm is convenient for operation and useful in guiding network planning and optimization, the simulation results show that the algorithm is effective and the...
This paper aims at improving the energy efficiency of small cell networks via cell sleep mechanism. The traditional power consumption minimization problem with quality of service (QoS) constraints is reestablished from the distributed small cell eNodeB (SeNB) sleep algorithm. The proposed algorithm consists of a Rate- based Access and Scheduling (RAS) algorithm and a distributed Diluted Load based...
Complementing macro-only cellular networks with low-powered base stations is a promising deployment solution to cope with exploding data traffic in the coming years. In Long Term Evolution (LTE)-Advanced, interference mitigation technologies, like the linear interference rejection combining (IRC) receiver and Enhanced Inter-Cell Interference Coordination (eICIC), are introduced to address the co-channel...
Ultra dense indoor deployment is widely recognized as one of the predominant network configurations of the future wireless systems. Dense indoor deployments are characterized by severe interference between co-channel access points deployed usually in close proximity of one another. Thus the effectiveness and efficiency of interference management techniques is the key to the success of ultra dense...
Asynchronous iterative water filling (AIWF), which is based on Shannon Theory, distributes resources fairly among users. Unlike Game Theory that requires users to exchange packets, AIWF does not require users to exchange packets for achieving Nash equilibrium. Conventionally, AIWF computes optimal transmit power for multiple users in Gaussian Wireless Channel. In this paper, AIWF was implemented upon...
Due to the situation that the mobile data traffic grows rapidly and users continue to improve the quality of service requirements, the operators which are lack of part of the spectrum resources make a weak response. While precise deployment of small cell with the same frequency in the macro cell is a better solution. In this paper, the network analysis and verification result is shown which is in...
Wireless Mesh Networks (WMN) are considered as robust architecture to provide reliable connectivity to fixed and mobile users. The redundant infrastructure provided by WMN can be efficiently utilized using multipath routing. However, the performance gain of multipath routing mainly depends on efficient path selection protocols. The omni-directional wireless medium, unstable link quality and mutual...
User association is one of the key techniques of the resource management in the heterogeneous cellular networks (HetNets). Interference management plays an important role on the system performance improvement in interference limited cellular networks. In this paper, we address the user association problem from the view of interference management of HetNets. Especially, we consider the co-channel interference...
This paper puts forwards an on-line reinforcement learning framework for the problem of traffic offloading in a stochastic Markovian heterogeneous cellular network (HCN), where the time-varying traffic demand of mobile terminals (MTs) can be offloaded from macrocells to small-cells. Our aim is to minimize the average energy consumption of the HCN while maintaining the Quality-of-Service (QoS) experienced...
In order to satisfy the increasing traffic requirement, dynamic Time Division Duplexing (TDD) Downlink/Uplink (DL/UL) time configuration is introduced to provide a more flexible service and improve the system performance. In a dynamic TDD system, the DL/UL time configuration can be changed based on the traffic load. Since Hybrid Automatic Repeat Request (HARQ) timing may become misaligned in dynamic...
This paper analyzes LTE-A Heterogeneous Network (HetNet) performance in terms of usual Quality of Service (QoS), energy efficiency and Electromagnetic Field (EMF) exposure. The main objective is to identify network deployment rules that would allow achieving optimal performance from multiple key indicators taking into account a realistic forecast of wireless data traffic demand growth. This study...
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