Volte Call Drop
One of the most important KPI is the LTE Call Drop Rate. Every network is striving to improve this KPI and it has become more important in LTE since the introduction of VoLTE. In simple words, a call drop in LTE means that a user’s ongoing session is dropped requiring the user to initiate a new connection to resume services. At the eNB level, this can be seen as an abnormal release which is verified from the cause code inside the Context Release message. Common Causes for Call Drops Like other KPIs, the call drop is also divided into two broad categories • Radio Induced Drops • MME Induced Drops 1. Radio Induced Call Drops DL RLC Retransmissions The most common drop pegged under Radio issues is the drop due to RLC retransmissions. If a network has a maximum of 16 RLC retransmissions for downlink, the eNB will send a message ...