Cell Selection & Reselection
Introduction After the UE completes system information acquisition, the next step is to determine whether the detected cell is suitable for camping. This process is called cell selection. During cell selection, the UE checks the available LTE cells and evaluates whether a cell satisfies the required coverage, quality, and access
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In this Session 4 of the 4G End-to-End Signaling Course, we break down LTE RRC states, RRC Idle vs RRC Connected, LTE to 5G state transitions, and the role of ECM and EMM states in the EPC/core network. You will learn how the UE is viewed from
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Welcome back to the 4G End-to-End Signaling Free Course – Session 3. In this session, we build the foundation for understanding LTE signaling by explaining the 4G LTE architecture, the role of each major EPC node, and how different network elements communicate with each other. You will learn the
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Welcome to Session 2 of the 4G End-to-End Course. In this video, we break down the LTE Random Access Procedure (RACH) step by step and explain how the UE moves from downlink synchronization to uplink synchronization before starting the connection setup process. This session covers the complete RACH
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Hi All, Session 1 of the 4G E2E Signaling Course is now available on YouTube. In this session, we build the essential LTE foundation concepts needed before going into detailed end-to-end signaling procedures such as attach, bearer setup, handover, and service request. This video explains how the UE
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In this video we’ll take a quick look at how VoLTE and IMS work together. First, we’ll go over the high-level architecture of VoLTE and IMS, showing the main network components involved in delivering voice over LTE. Then, we’ll briefly explain the end-to-end call
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This post summarizes possible 5G NSA abnormal release root causes: * The detection of NR Radio Link Failure (RLF) can be carried out by either the UE(MN) or the gNodeB (SN). * A 5G Call Drop (RLF) is identified and declared through various factors, including, and not limited to the following:
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Introduction: This Article is a deep dive into 5G NSA Accessibility Signaling overview and Failures Possible Causes & Troubleshooting Methods. The following topics are covered in this article: 1. NSA(ENDC) Network Overview 2. 5G Secondary Node Addition procedure 1. SgNB addition triggering Scenarios 2. High-level procedure for adding
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This video is part of the Non-Standalone series, where we will cover signaling call flow, Troubleshooting guides, 5G traffic increase, insights on how to detect low-traffic sites, and the top 5G NSA features. In this video, we'll deep dive into NSA Access Signaling, specifically focusing on
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This video is part of the Non-Standalone series, where we will cover signaling call flow, Troubleshooting guides, 5G traffic increase, insights on how to detect low-traffic sites, and the top 5G NSA features. In this video, we'll deep dive into NSA Access Signaling, specifically focusing on
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This article explains why 5G ANR is not triggered and does not work whenever SIB1 is disabled in the 5G Non-Standalone network. The below figure shows the signaling flow for NR PSCell changes in 5G NSA Network. 1. The UE sends a measurement report for the frequency specified by