Ue capability information lte call flow. Strictly speaking, this is a kind of optional step.

Ue capability information lte call flow LTE is designed for packet switching and operates on an all-IP network. Procedure of Handover (LTE to NR handover) Overall logic is simple and this process are the same (or at least very similar) in every This step would be one of very important steps during the initial registration process mainly because UE send a lot of it's capability information (especailly NAS layer capability information) to the core network. Dec 27, 2023 · 5G EN-DC (Evolved-Universal Terrestrial Radio Access-New Radio Dual Connectivity) refers to the simultaneous use of LTE (4G) and 5G NR (New Radio) radio access technologies by a user equipment (UE). During the initial attach procedure, there are several steps in which UE and Network exchange its capability so that they can setup a proper data pipes that can be supported by both of them. 8. During this evaluation process two options are gaining significant momentum: Circuit Switched Fall Back (CSFB) and LTE VoIP-based Single Radio Voice Call Continuity (SRVCC). 5G NR and LTE (from Release 15) onwards introduced so-called Feature Sets to overcome this problem. This registration is known as the The industry is exploring and evaluating diferent possibilities to overcome the LTE voice issues. Putting it simple, it is a Handover technology between "VoIP over IMS in LTE" and Voice Call (CS) in a legacy system (e. The message contains maximum bit rate information for the UE. The message also contains information about the supported 5G frequency bands. This message serves several significant technical purposes, as outlined below: 1. A detailed guide for telecom professionals and enthusiasts to master LTE call flow. It is a type of InterRAT handover since the cell change happens between two different RAT (Radio Access Technology). LTE vs NR in terms of Reduced Capability There has been LTE equivalent of RedCap which targets mid-tier IoT devices (not as much reduced capability as LTE BL/CE or NB-IoT). Aug 18, 2025 · Explore the LTE flow chart step by step—from UE attach to bearer setup. It details the capabilities and specifications of the user devices in use. The following signaling is covered: EPSFB call is coordinated between the 5GS (5G System) and EPS (Evolved Packet System) systems and transition of the call happens from 5G NR to the legacy LTE network after the negotiation of both UE and network capabilities, as shown in below figure 1. The UE CAPABILITY INFORMATION message is used to transfer of UE radio access capabilities requested by the E-UTRAN in UE CAPABILITY ENQUIRY. Key call flow steps include attach request, authentication, context setup, and establishment of bearers between the UE and PDN gateway. Now goes the Bad News. LTE UE capabilities pretty viewerUE capabilities pretty viewer RRC message UE Capability Information analyser Copy / Paste the decoded message of a trace into the text area below and click Process Sep 16, 2018 · 5G non-standalone access Signaling flow for 5G access via LTE-5G NR dual connectivity (EN-DC) Updated on March 15, 2019 Transition to 5G is being accelerated by enabling support for 5G bearers in This article explains the VoLTE UE attach and registration procedures, outlining the message flow between the User Equipment (UE) and the IP Multimedia Subsystem (IMS). 1. To support voice services over LTE, two main methods are used: IMS and Circuit Switched Fallback (CSFB IMS SRVCC (Single Radio Voice Call Continuity) SRVCC stands for Single Radio Voice Call Continuity. Introduction VoLTE stands for Voice over LTE. This example is done with a simulated environement for the following setup. So let’s break it down. Nov 7, 2023 · The UE (User Equipment) Capability Information Indication message, often referred to as UE Capability Information or UECap, is a crucial element in LTE (Long-Term Evolution) networks. And NSA call flow is the set of message flows between UE and Network. This information is crucial for the network to optimize its operation, The call flow in the LTE network is unique among mobile communication standards and represents the signaling and sessions established across the network. g, LTE,WCDMA), Network informs on its capability via various SIB messages and UE informs its 4G/LTE - LTE Advanced Message Flow There are a good news and a bad news on RRC messages for Carrier Aggregation. BTS will be able to take accurate scheduling decisions after receiving UE Capabilities info Information Covered? 1- Network Capability: Included in Attach 5G NR : UE capability Information - FeatureSets and FeatureSetCombinations [QXDM /QCAT Log Analysis] LTE 6. ueCapabilityRAT-Container is the container for the UE capabilities of the indicated RAT. In modern LTE and 5G networks, the UE Capability Enquiry and UE Capability Information procedures play a critical role in enabling seamless communication and optimal resource allocation between the User Equipment (UE) and the network. g, WCDMA). (UE Capability Information and RRC Connection Reconfiguration). T3470 UCI UE Capability Information (Useful for radio stack troubleshoot) UE Category / UE Class UE transmit antenna selection UICC/USIM UL Grant USIM Parameters Voice in LTE VoLTE over IMS Wake Up Signal WiFi OffLoad : Introduction WiFi OffLoad : CheckList WiFi OffLoad : Overall Procedure of Untrusted Data Path Setup WiFi OffLoad : ePDG EPSFB call is coordinated between the 5GS (5G System) and EPS (Evolved Packet System) systems and transition of the call happens from 5G NR to the legacy LTE network after the negotiation of both UE and network capabilities, as shown in below figure 1. UE Capability Information UE Capability Information is an RRC message that UE sents to Network (in most case during initial registration process). It also outlines the basic LTE call flows for initial call setup, detach procedures, idle-to-active transitions, and handovers. Sometimes they exchange these information as a mandatory part of initial setup and sometimes they provide these information in response to a special request from the other party. . Aug 15, 2016 · Basic Call Flow in LTE LTE Call flow lte call flow 3gpp UE Capability Information UE Capability Enquiry RRC Connection Reconfiguration + NAS : Attach Accept RRC Connection Reconfiguration Complete + NAS : Attach Complete PRACH Preamble RRC Connection Request RRC Connection Setup RRC Connection Setup Complete + NAS : Service Request Security Mode Command Security Mode Complete RRC Connection What is the UE Capabilities message? Definition UE Capabilities Message Why it is needed? UE capability is an RRC signaling mechanism in which the UE provides its capabilities to the network. 4G/LTE - RRC RRC IE - UE Capability Info In most of communication protocol, the parties participating in the communication exchange the information about its capability so that the each party does not request any capability which is not supported by its counter part. Bad News is that the two message are so complicated Jul 27, 2025 · In 5G,UE registration is process that establishes the UE's presence on the network, authorizes it for services and enables mobility tracking. IMS UE Capability Information In most of communication system, the parties participating in the communication exchange the information on what they are capable of. Oct 6, 2023 · The UE Capability Information (UE CI) message in LTE (Long-Term Evolution) communication is a crucial element that serves to inform the network about the capabilities and characteristics of a User Equipment (UE), such as a mobile phone or data device. Overall SRVCC Mechanism SRVCC Evolution UE Capability May 9, 2014 · The LTE attach procedure call flow is a subject that may seem hard to understand. - Download . It means it is for Handover between a Packet call in LTE and a Circuit Call in a legacy system (WCDMA). Understand the key features and requirements of VoNR in 5G networks. The latter is widely supported in the industry and has been recommended by the LTE OneVoice Initiative, which has the Explore 5G VoNR (Voice over NR) architecture, call flow, setup, registration, and termination messages. Aug 1, 2010 · Figure 8. 6. Following table shows nice summary and comparision between NR Light (5G RedCap) and LTE Equivalent which would not require any further explanation. The encoding is defined in the specification of each RAT. Extract the dual connectivity capabilities from the UE Capability Info message. You would see a little bit of differences in terms of signaling message name comparing to VoLTE setup, but those differences are due to signaling difference between LTE and NR, not specifically due to IMS side difference. It informs on all the details of its capabilities. Oct 9, 2023 · The UE (User Equipment) Capability Information Request message in LTE (Long-Term Evolution) is a signaling message used by the network, specifically the Mobility Management Entity (MME), to request detailed information about the capabilities and supported features of the User Equipment (UE). 1 General The UE capability update procedure is used by the UE to convey UE specific capability information to the UTRAN. UE reports that it supports the EUTRA-NR radio access technology. lest discuss all these in detail. Strictly speaking, this is a kind of optional step. S1AP View of LTE Attach & EPS Bearer Setup This sequence diagram looks at the UE signaling from the S1AP vantage point. See full list on mohamedeladawi. UE capability determines the total number of serving Cells that can be configured and this information is transmitted by the UE when UE is registering in the network. If you are familiar with WCDMA or LTE, RRC Connection NTN Call Flow (NB IoT) This is a sample log from Amarisoft Callbox with NTN for LTE NB IoT. Which one do you want to go first ? Good News first ? Good News is that basically there would be only two messages you have to dig into. EUTRA-NR specific capabilities are specified in the UE-MRDC-Capability container. Quality of service information for the new eRAB is also specified (QCI, maximum bit rate downlink and uplink). com UE capability Enquiry/UE capability Information is a signaling mechanism by which UE inform RAN (Radio Access Network) about its RRC capability. 92K subscribers Subscribe LTE eNodeB S1 startup, MIB-SIB broadcast and RRC connection Learn about eNodeB startup: (1) eNodeB performs an S1 setup (2) MIB and SIB broadcast (3) eNodeB sends UE specific configuration information via the RRC Connection Setup message. NOTE : If you want to see the contents of full log with Amarisoft Log viewer, go to LogAnalysis section and click on 'Sample Log' in this tutorial of Amarisoft TechAcademy. In mobile communication (e. I wouldn't put all the details of NR signaling procedure here. Oct 6, 2023 · The UE Capability Enquiry (UE CE) message in LTE (Long-Term Evolution) communication is used by the network to request specific information about the capabilities and characteristics of a User Equipment (UE), such as a mobile phone or data device. but it is becoming more and more critical steps as LTE service evolves. Jul 7, 2025 · Understanding the Importance of UE Capability Information In the realm of Long-Term Evolution (LTE) networks, User Equipment (UE) capability information plays a crucial role. How does the LTE attach procedure call flow work? Well first, the UE needs to register with the network to receive services that require registration. Further, we will discuss The LTE call flow begins with a UE and an eNodeB, which perform the centralized MME functions of authenticating the subscriber, obtaining real-time location information on the subscriber, and performing authentication and authorization operations including PTAI, forwarding session start requests and other messages. 6-1: Transmission of UE capability information, normal flow 8. Network operators and engineers rely heavily on this information to ensure optimal network performance and deliver seamless connectivity to end Dec 5, 2020 · For UEs supporting (NG) EN-DC or NE-DC, the size of UE capability information would be enormous if the UE has to report capabilities separately per each reported band in the corresponding band combination. The LTE call flow navigates over the elements of the network going through certain steps in order to complete its end-to-end signaling from the user equipment (UE) all the way to the rest of the network components. Aug 27, 2022 · Overall Call Flow Following is the overall call flow of NR. It involves: 1) The UE performing random access and connection requests to the eNB; 2) Authentication and security setup between the UE, MME, and HSS; 3) Context setup and exchange of UE capability information between the UE, eNB, and MME; 4) Session creation between the MME, S-GW, and P-GW to enable data transfer. 4G/LTE - Multi Cell LTE to NR Handover LTE to NR handover is a process in which UE switches the cell from LTE to NR cell in connected mode. As LTE release goes higher and more features are added, UE Capability Information has become the longest and most complicated Radio Message. Mar 8, 2023 · What is NSA and NSA call flow? NSA stands for Non-stand-alone, which means there is an LTE cell required to connect a 5G cell. This is the role of UE Capability Enquiry and UE Capability Information message. 2 Initiation The UE shall initiate the UE capability update procedure in the following situations: 1> the UE receives a UE CAPABILITY ENQUIRY message from the UTRAN; 1> while in CELL_DCH or The document discusses LTE network architecture including nodes like the eNodeB, MME, SGW and PGW, and their functions. 9dfze cydi2j oqiyds v1rgo9 h2dhd k9wdnj zst w19ls cw jtte