Voice over LTE using Call Admission Control [Survey]

INFORMATION TECHNOLOGY

Long Term Evolution (LTE) is the Fourth-Generation (4G) mobile broadcast technology. This paper proposes a Call Admission Control scheme (CAC) which is based on macroscopic modeling of vehicular traffic. Macroscopic model describes vehicular traffic in terms of number of vehicles, mean speed and cell transition probability. CAC schemes have been previously proposed for cellular networks where a certain amount of system bandwidth is reserved for high-priority calls. This paper also deals with the Quality of Service (QoS) in a Voice Over LTE (VoLTE) Service. This introduces a problem of how to provide voice services in networks. When a new call request arrives in a cell, our call admission control scheme considers ongoing calls in the cell and adjacent cells. We propose a channel borrowing approach in which new best effort (BE) calls can borrow the reserved bandwidth for high-priority calls. The analytic model for this scheme is a mixed loss-queuing system for which it is difficult to calculate call blocking probability (CBP) and call dropping probability (CDP). Our focus in this paper is on the system modeling and performance evaluation of the proposed scheme. This scheme shows better network utilization and it is observed that our channel borrowing approach decreases the CBP considerably while increases the CDP slightly over a large range of hand-off rates.

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