Análisis de mensajería en los protocolos del interfaz aire, para determinar las causas que producen llamadas caídas en el servicio de telefonía celular (SMA) en la ciudad de Riobamba.

Abstract

The objective was to determine the causes of the dropped calls of the Advanced Mobile Service in Riobamba city provided by cellular telephony. To perform the analysis of dropped calls and determine their specific causes, the platform of Autonomous System of Mobile Measures (ASMM) of the Agencia de Regulación y Control de las Telecomunicaciones (ARCOTEL) was used. This work analyzed the messaging that delivers the protocols of the air interface of the 2G and 3G mobile technologies that captures the Tems Discovery platform and encodes them with the so-called values of the specific causes of call control standardized in the recommendations ITU-T Q.850 (International Telecommunication Union) and TS 24.008 3GPP (3rd Generation Partnership Project).The results indicate that the most frequent cause for the dropped calls corresponds to the typification 102 caused by the expiration recovery of the timer T313 of the Mobile Switching Center of the mobile operators. However, the percentages of dropped calls per operator are lower than 2% established as limit in the current legislation, concluding that this phenomenon does not affect significantly the quality of cellular telephony. It is recommended that in order to determine in which part of CORE produces the dropped calls within the network of an operator is necessary that agreements are made between the control body and the operators. This will allow to find solutions that the operators can realize in their respective infrastructures.