Dynamic user equipment‐based hysteresis‐adjusting algorithm in LTE femtocell networks

Abstract

In long-term evoluation (LTE) femtocell networks, hysteresis is one of the main parameters which affects the performance of handover with a number of unnecessary handovers, including ping-pong, early, late and incorrect handovers. In this study, the authors propose a hybrid algorithm that aims to obtain the optimised unique hysteresis for an individual mobile user moving at various speeds during the inbound handover process. This algorithm is proposed for two-tier scenarios with macro and femto. The centralised function in this study evaluates the overall handover performance indicator. Then, the handover aggregate performance indicator (HAPI) is used to determine an optimal configuration. Based on the received reference signal-to-interference-plus-noise ratio, the distributed function residing on the user equipment (UE) is able to obtain an optimal unique hysteresis for the individual UE. Theoretical analysis with three indication boundaries is provided to evaluate the proposed algorithm. A system-level simulation is presented, and the proposed algorithm outperformed the existing approaches in terms of handover failure, call-drop and redundancy handover ratios and also achieved better overall system performance.

Predicting the Probability of Spectrum Sensing with LMS Process in Heterogeneous LTE Networks

“…A TTT is required time for satisfying HOM condi- tion. The LTE Hard Handover condition is presented as follows [25], [40], [41], [42], [43], [44]:…”

“…To verify the validity of the LMS process on energy detection we use two other traces pedestrian mobility of METIS [40] in the same topology model (Fig. 17) and simulation parameters (Tab.…”

Interference management in macro‐femtocell and micro‐femtocell cluster‐based long‐term evaluation‐advanced green mobile network

“…A radio resource management scheme has been proposed in [20] based on two player sequential game for LTE downlink. In [21] a dynamic user equipment-based hybrid hysteresis-adjusting algorithm has been proposed for gaining the optimised distinctive hysteresis for individual mobile user. A downlink power control scheme for femtocell signal has been proposed in [22] that alters the transmission power depending on path loss.…”

“…The path losses (in dB) in a single macrocell, single microcell and in a cluster of a macro-femtocell and micro-femtocell cluster-based LTE-A network are determined using (19), (21) and (26), respectively. The path loss in a macro-femtocell and micro-femtocell cluster-based LTE-A network is presented in Fig.…”

Technique for order of preference by similarity to ideal solution based predictive handoff for heterogeneous networks

“…The study uses RSS samples to predict the prospective samples and thereby obtain a handoff trigger that results in lower latency. Moreover, the dynamics of user velocity has been the concerns of the study in [19]. The work proposes an algorithm to obtain unique hysteresis for users moving at different speeds.…”