Abstract
The fifth generation (5G) network is an upcoming standard for wireless communications that coexists with the current 4G network to increase the throughput. The deployment of ultra-dense small cells (UDSC) over a macro-cell layer yields multi-tier networks, which are known as heterogeneous networks (HetNets). HetNets play a key role in the cellular network to provide services to numerous users. However, the number of handovers (HOs) and radio link failure (RLF) greatly increase due to the increase in the UDSC in the network. Therefore, mobility management becomes a very important function in a self-organizing network to improve the system performance. In this paper, we propose a velocity-based self-optimization algorithm to adjust the HO control parameters in 4G/5G networks. The proposed algorithm utilizes the user’s received power and speed to adjust the HO margin and the time to trigger during the user’s mobility in the network. Simulation results demonstrate that the proposed algorithm achieves a remarkable reduction in the rate of ping-pong HOs and RLF compared with other existing algorithms, thereby outperforming such algorithms by an average of more than 70% for all HO performance metrics.
Highlights
Heterogeneous networks (HetNets) have gained considerable attention in the past few years.These networks consist of different types of cells, such as macro, pico, and femto, which are introduced to meet user demand
The results demonstrated that the adapted HO control parameters (HCPs) reduce the rates of HO ping-pong (HOPP), HO probability (HOP), and radio link failure (RLF)
We formulate and address the issue of mobility robustness optimization (MRO) in HetNets by focusing on two performance main metrics: RLF and HOPP, which lead to service interruption
Summary
Heterogeneous networks (HetNets) have gained considerable attention in the past few years. Mobility management should be properly addressed to avoid service degradation due to high rates of HO, HOPP, and radio link failure (RLF) This issue should be resolved to ensure that the 5G of cellular networks can provide a seamless communication during user movement among different deployment scenarios [6,7]. The HCP consists of two main parameters: HO margin (HOM) and time to trigger (TTT) By adjusting these parameters to the proper values during user movements in cell coverage, the rates of HOPP and HOF are minimized, improving the service quality. We formulate and address the issue of MRO in HetNets by focusing on two performance main metrics: RLF and HOPP, which lead to service interruption.
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