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FDD LTE Call Drop Troubleshooting Guide

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Call drop optimization in LTE
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  Confidential ▲   FDD LTE Call Drop Troubleshooting Guide CDMA & FDD LTE Product Support Dept.  Confidential ▲   Table of Contents  Call Establishment and Call Drop  Cause Analysis  Troubleshooting Procedure  Case Study  Confidential ▲   Call Establishment and Call Drop  NAS and AS  NAS: Non-Access Stratum   AS: Access Stratum DeregisteredRegistered IdleConnected IdleConnected ConnectedIdle1. Power-offAttached 2. Idle/ Registered EPC Connected 3. Activated Evolved Mobility Management (EMM)Evolved Connection Management (ECM)Radio Resource Control (RRC)  Confidential ▲   Call Establishment and Call Drop  Connection Release  Call Drop  –  Definition   A call will be dropped when an UE exits the RRC_CONNECTED state.  RRCConnectionRelease UE EUTRAN
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