Comparison of Vertical Handover Decision-Based Techniques in Heterogeneous Networks

Adada Edia,Folayo Aina,Opeyemi Osanaiye,Olayinka Ogundile

doi:10.4236/ijcns.2018.1112015

Abstract

Industry leaders are currently setting out standards for 5G networks projected for 2020 or even sooner. Future generation networks will be heterogeneous in nature as no single network type will be capable of optimally meeting all the rapid changes in customer demands. With the advent of multi-homed devices and heterogeneous network (HetNet) solution, great concerns arise in the processes involved for successful handover. Active calls that get dropped or cases of poor quality of service experienced by mobile users can be attributed to the phenomenon of delayed handover (HO) or an outright case of an unsuccessful handover procedure. This work compares multiple criteria handover basis to its traditional single relative signal strength (RSS) base counterpart. It analyses the performance of a fuzzy-based VHO algorithm scheme in a Wi-Fi, WiMAX, UMTS and LTE integrated network using OMNeT++ event simulator. The loose coupling network architecture is adopted and simulation results analysed for the two major categories of handover; the multiple and single criteria. Results obtained show a better overall throughput, better call dropped rate and shorter handover time for the multiple criteria based decision method as compared to the single criteria based technique. This work also highlights current research trends, challenges of seamless handover and initiatives for Next Generation HetNet.

Highlights

There is a consensus in the research community that there is an increase in the number of mobile users
We identified the problem of poor QoS and quality of experience (QoE), which we attribute to the type of handover mechanism implemented in heterogeneous network (HetNet)
The development stage starts with the implementation of the Fuzzy logic inference system (FIS), integration of the handover codes generated from the Fuzzy tool box in MATLAB, developing the codes for the HetNet using the inbuilt framework of the simulator and defining all other parameters and constraints experienced in real case scenarios such as obstacles, interference and fading

Summary

Introduction

There is a consensus in the research community that there is an increase in the number of mobile users. The IEEE802.21 standard created a framework designed to support all the protocols required for the seamless handover process; detecting networks within range and executing the handoff. This paper focuses on the performance of the single criterion and multiple criteria methods of handover in heterogeneous wireless networks. We aim at preventing degradation of both real-time services (voice/video) and non-real-time services (SMS, MMS and web services) during mobility This will translate to good quality of service (QoS) for multiple and single users. We : 1) Present insights into the selection of handover (HO) schemes and HO design parameters, 2) Create an environment that will adequately simulate the HO scenario and show how the OMNeT++ Framework suits the simulation of communication networks.

Fundamental Principles of Handover

System Model

Fuzzy Inference System

Simulation Performance and Results

Linear

Conclusions