Blocking rate based call admission control for call dropping mitigation and QoS based prioritization

Abstract

Long Term Evolution (LTE) users with high mobility often experience poor communication issues, such as call dropping and call blocking effects. These issues, which are resulted from the frequent handover, can be mitigated by a call admission control (CAC) algorithm. Located inside the base station (eNB), CAC algorithm is responsible for determining whether to accept or to reject incoming calls. In this paper, a CAC algorithm is proposed to reduce call dropping rate for LTE users who need to handover their calls frequently. The proposed algorithm can also be designed to make the overall system more efficient by accepting more calls with higher priority, specifically, calls with higher quality of service (QoS) requirement and calls with good channel quality.