The Cost of QoS in LTE/EPC Mobile Networks Evaluation of Processing Load

Abstract

International audienceLTE/EPC is an all-IP mobile system which provides higher data rates and lower latency. Nevertheless guaranteeing the QoS is a real challenge since the LTE/EPC QoS model inherits many characteristics of circuit oriented legacy standards. Contrary to usual QoS models of the fixed internet (IP networks), additional signalling procedures are required in order to establish a dedicated bearer for each desired QoS level. This paper introduces an analytical model to evaluate the impact of such a QoS model in terms of Processing Load. Simulation results are then presented to evaluate the impact of different scenarios of QoS deployment

Cost factor analysis of QoS in LTE/EPC mobile networks

“…The normalized Context Loads increase with τ , as the number of average active contexts. On the contrary, in [8] we showed that the Processing Load decreases exponentially with τ reflecting the decreasing number of transitions from CONNECTED to IDLE states. The total Processing Load an Memory Access Rate are obviously increased compared to the BE scenario due to QoS deployment.…”

“…In order to evaluate the Processing Load (S), we extend the analysis proposed in [8] by adding procedures related to mobility. This analysis is based on some elements described in [2], which have been enriched introducing our state machine model described above.…”

“…Nevertheless, none of these studies addresses the impact of the QoS model defined by the 3GPP standards. In [8] we introduce an analytical model to evaluate the number of incoming signalling messages at LTE/EPC network elements (Processing Load) when this QoS scheme is deployed.…”