Mobility Management and Radio Resource Management: Scheduling Schemes Automatic Selection for Handover Mechanism

摘要

Handover (HO) algorithms, managed by Mobility Management Entity (MM), and Scheduling algorithms, managed by Radio Resource Management Entity (RRM) are both the most important aspects in the next-generation cellular systems 3GPP Long Term Evolution (LTE). When a User Equipment (UE) is in motion, the constraints of offering better Quality of Service (QoS), especially in Real Time applications, increase. This is why the design of a powerful handover algorithm is essential, in order to ensure a seamless transfer of a UE to a new cell. In this article, we propose a new HO algorithm based on the Available Bandwidth prediction at the eNBs level. The improvements proposed by our scheme compared to other HO algorithms such as LTE Hard Handover Algorithm (LHHA), Integrator Handover and LTE Hard Handover Algorithm with Average RSRP Constraint (LHHAARC) has been shown via different parameters namely throughput, system delay and Packet Loss Ratio (PLR). Using LTE-Sim simulator, all HO algorithms were simulated against the three well-known scheduling schemes, namely, Proportional Fair (PF), Exponential Proportional Fairness (EXP / PF) and Modified Largest Weighted Delay First (MLWDF). The objective is to define a synthesis allowing the automatic choice of the proper scheduling scheme to use, according to the HO decision algorithm predefined by the system.