scholarly journals Handover Performance over a Coordinated Contiguous Carrier Aggregation Deployment Scenario in the LTE-Advanced System

2014 ◽  
Vol 2014 ◽  
pp. 1-15 ◽  
Author(s):  
Ibraheem Shayea ◽  
Mahamod Ismail ◽  
Rosdiadee Nordin ◽  
Hafizal Mohamad
Keyword(s):  
Spectral Efficiency ◽  
Carrier Aggregation ◽  
Lte Advanced ◽  
Ping Pong ◽  
Two Component ◽  
A Cell ◽  
Simulation Results ◽  
Outage Probabilities ◽  
Advanced System ◽  
Handover Performance

Although various carrier aggregation deployment scenarios (CADSs) have been introduced in the LTE-Advanced system, issues related to insufficient eNB coverage that leads to low throughput and high drop call have yet to be solved. This paper proposes a new deployment scenario called coordinated contiguous-CADS (CC-CADS), which utilizes two-component carriers (CCs) that operate on two frequencies located in a contiguous band. Each CC antenna is directed to a cell boundary of the other CC. The handover performance of users with various mobility speeds under CC-CADS has been investigated and compared with various deployment scenarios proposed by 3GPP. Simulation results show that the received signal reference power (RSRP) enhancement and performed handover, ping-pong, drop call, and outage probabilities reductions in CC-CADS outperformed the 3GPP’s CADSs, thus leading to reduced interruption time, improved spectral efficiency, and seamless handover.

scholarly journals Novel Handover Optimization with a Coordinated Contiguous Carrier Aggregation Deployment Scenario in LTE-Advanced Systems

2016 ◽  
Vol 2016 ◽  
pp. 1-20 ◽  
Author(s):  
Ibraheem Shayea ◽  
Mahamod Ismail ◽  
Rosdiadee Nordin ◽  
Hafizal Mohamad ◽  
Tharek Abd Rahman ◽  
...  
Keyword(s):  
System Performance ◽  
Parameters Optimization ◽  
Carrier Aggregation ◽  
Control Parameters ◽  
Coverage Area ◽  
Performance Function ◽  
Lte Advanced ◽  
Ping Pong ◽  
Outage Probabilities ◽  
Cell Edge User

The carrier aggregation (CA) technique and Handover Parameters Optimization (HPO) function have been introduced in LTE-Advanced systems to enhance system performance in terms of throughput, coverage area, and connection stability and to reduce management complexity. Although LTE-Advanced has benefited from the CA technique, the low spectral efficiency and high ping-pong effect with high outage probabilities in conventional Carrier Aggregation Deployment Scenarios (CADSs) have become major challenges for cell edge User Equipment (UE). Also, the existing HPO algorithms are not optimal for selecting the appropriate handover control parameters (HCPs). This paper proposes two solutions by deploying a Coordinated Contiguous-CADS (CC-CADS) and a Novel Handover Parameters Optimization algorithm that is based on the Weight Performance Function (NHPO-WPF). The CC-CADS uses two contiguous component carriers (CCs) that have two different beam directions. The NHPO-WPF automatically adjusts the HCPs based on the Weight Performance Function (WPF), which is evaluated as a function of the Signal-to-Interference Noise Ratio (SINR), cell load, and UE’s velocity. Simulation results show that the CC-CADS and the NHPO-WPF algorithm provide significant enhancements in system performance over that of conventional CADSs and HPO algorithms from the literature, respectively. The integration of both solutions achieves even better performance than scenarios in which each solution is considered independently.

Study on the Resource Scheduling Algorithm for LTE-Advanced Downlink Systems

2014 ◽  
Vol 577 ◽  
pp. 1017-1021
Author(s):  
Hong Zhuo Wang ◽  
Zheng Hai Sun ◽  
Jun Wang ◽  
Fang Liu
Keyword(s):  
Power Allocation ◽  
Scheduling Algorithm ◽  
Resource Scheduling ◽  
Carrier Aggregation ◽  
High Complexity ◽  
Proportional Fair ◽  
Lte Advanced ◽  
Simulation Results ◽  
Equal Power Allocation ◽  
Equal Power

In the paper, the resource scheduling algorithm in the downlink of LTE-Advanced (LTE-A) assuming equal power allocation among subcarriers which adopted the technology of carrier aggregation (CA) is investigated. When the independent scheduling (INS) scheme is applied, the LTE users will acquire few resources because they cannot support CA technology. And the fairness of the system is disappointing. Focusing on the problem, a novel proportional fair (PF) scheduling algorithm based on INS is proposed. In the proposed method, the system fairness is well improved without bringing high complexity to the system. And also, we design a weigh factor which is related to the number of the carriers and the percentage of LTE users in the method. The simulation results show that the proposed algorithm can effectively increase the throughput of LTE users and improve the system fairness.

scholarly journals Adaptive Handover Decision Algorithm Based on Multi-Influence Factors through Carrier Aggregation Implementation in LTE-Advanced System

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Ibraheem Shayea ◽  
Mahamod Ismail ◽  
Rosdiadee Nordin ◽  
Hafizal Mohamad
Keyword(s):  
Outage Probability ◽  
Influence Factors ◽  
User Mobility ◽  
Carrier Aggregation ◽  
Decision Algorithm ◽  
Handover Decision ◽  
Lte Advanced ◽  
Advanced System ◽  
Better Than

Although Long Term Evolution Advanced (LTE-Advanced) system has benefited from Carrier Aggregation (CA) technology, the advent of CA technology has increased handover scenario probability through user mobility. That leads to a user’s throughput degradation and its outage probability. Therefore, a handover decision algorithm must be designed properly in order to contribute effectively for reducing this phenomenon. In this paper, Multi-Influence Factors for Adaptive Handover Decision Algorithm (MIF-AHODA) have been proposed through CA implementation in LTE-Advanced system. MIF-AHODA adaptively makes handover decisions based on different decision algorithms, which are selected based on the handover scenario type and resource availability. Simulation results show that MIF-AHODA enhances system performance better than the other considered algorithms from the literature by 8.3 dB, 46%, and 51% as average gains over all the considered algorithms in terms of SINR, cell-edge spectral efficiency, and outage probability reduction, respectively.

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