Analysis of Different Call Admission Control Strategies and Its Impact on the Performance of LTE-Advanced Networks

Mahammad A. Safwat, Hesham M. El-Badawy, Ahmad Yehya, Hosni El-Motaafy

Department of Electrical Engineering, Al-Azhar University, Cairo, Egypt.
Department of Electronics and Computer Engineering, HIT, Tenth of Ramdan City, Egypt.
Network Planning Department, National Telecommunication Institute, Cairo, Egypt.

DOI: 10.4236/cn.2014.62016                

Abstract

The call admission control (CAC) optimizes the use of allocated channels against offered traffic maintaining the required quality of service (QoS). Provisioning QoS to user at cell-edge is a challenge where there is limitation in cell resources due to inter-cell interference (ICI). Soft Frequency Reuse is ICI mitigation scheme that controls the distribution of resources between users. In this paper, the Impact of four CAC schemes (Cutoff Priority scheme (CP), Uniform Fractional Guard Channel (UFGC), Limited Fractional Guard Channel (LFGC), New Call Bounding (NCB) scheme) at cell-edge have investigated using queuing analysis in a comparative manner. The comparison is based on two criteria. The first criterion guarantees a particular level of service to already admitted users while trying to optimize the revenue obtained. The second criterion determines the minimum of number of radio resources that provides hard constraints in both of blocking and dropping probabilities. The four schemes are compared at different scenarios of new and handover call arrival rates.

Keywords

Call Admission Control, Soft Frequency Reuse, QoS

Conflicts of Interest

The authors declare no conflicts of interest.

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