5g synchronization procedure

Before Rel 16, there was only 1 type of RACH that is similar to LTE i.e 4-step RACH. is procedure may be repeated multiple times untilsuccessful RA is achieved. The text was updated successfully, but these errors were encountered: When we want to connect a UE to a 5G network, it has to synchronize in downlink as well as in uplink. The mobile sends a RACH preamble and based on that the . R&SROMES4 Product information. Synchronization is one of the most critical functions of a communication system; however, in the context of 5G, especially for Time Division Duplex (TDD) where both uplink and downlink transmission is on the same frequency, the possibility of interference is much more significant. downlink. UE tries to detect SSB and decode PSS and SSS. Omri et al. PDU UE synchronization procedure in idle mode receives the failed QFIs, QoS rules and EBIs. layer-1 and rest are layer-2 as per OSI stack. This framework makes 5G AKA procedure suitable for both open and access-network agnostic using three authentication methods namely 5G-AKA, EAP-AKA', and EAP-TLS. The video then discusses broadcast channel (BCH) decoding, how . the roll out of 5G service in un-served areas that cannot be covered by terrestrial 5G network and. In 5G NR, Cell search concept is similar to what it is in LTE. My understanding is we can extract the SSB with the strongest peak of PSS correstion and by search for the index of the PBCH DM-RS with . interpolation ue4. View the full playlist here: https://www.youtube.com/playlist?list=PLn8PRpmsu08rCL-Ejn25HMX6M6o7QjJoeIn this video, you'll learn about the synchronization si. Method #1: 5G to 4G Inter-RAT Handover. 5G-SS Block. In this example we shall use = 1, corresponding to 30 kHz subcarrier spacing: mu = 1 mu = 1 The number of slots per subframe is 2 , as doubling the subcarrier spacing halves the OFDM symbol duration. o Paging: procedure adaptations in case of moving satellite foot prints or cells Standardization Activity: . There are 2 types of Random Access Procedure in 5G Network.. Contention Based Random Access(CBRA): UE selects a random access preamble from a pool of preambles shared with other UE, so in CBRA UE taking the risk to select the same preamble as another UE. In this method, 5G radio connection is released with the 5G. How Synchronization work ? 2. Once, the 5G NR leg is added, the mobile connects to the 5G NR leg by using RACH procedure. GoTechnical 5G NR. This section describes the UE synchronization procedure. Due to the wide range of frequencies that are defined for the 5G NR systems, the corresponding synchronization . Similar to all mobile communication networks, synchronization in the time-frequency domain is a fundamental step that allows a fifth-generation (5G) new radio (NR) user equipment (UE) to properly receive and transmit its data. Time and phase synchronization is particularly important in 5G networks. Cell search and PBCH : In NR-5G, Cell search concept is close to what we had in LTE. In 5G, we are moving away from a synchronized fronthaul CPRI to a packet-based fronthaul.While this approach offers a number of advantages, packet-based fronthaul introduces complexities for synchronization.Providers need different approaches depending on the topology and configuration of their networks. NR cell search is based on the primary and secondary synchronization signals, and PBCH DMRS, located on the synchronization raster. Summary of the invention . Downlink synchronization ; PSS: 5ms synchronization ; SSS: 10ms synchronization ; Identify it is a FDD or TDD system and CP mode. We study the existing algorithms for time and frequency synchronization. In this video, you'll learn about the synchronization signal block (SSB) in 5G New Radio (NR). LTE Initial Access Procedure. The PSS enables frame synchronization and, along with the SSS . The synchronization in time-frequency domain is a crucial step for the fifth generation (5G) new radio (NR) systems. UE then decode the PBCH before proceeding to decode other system information (RMSI) which is transmitted on the PDSCH. Only 62 subcarriers are actually occupied. From the series: 5G Tutorial This video discusses initial acquisition procedures starting with cell search. It will contain the parameters required to decode SIB1. Random Access: Random access required to do uplink synchronization between UE and eNB and gNB. NR supports up to 1008 physical cell identities, twice as many as that of LTE. The frequency-domain is located in the 72 subcarriers near direct current. The PSS enables frame synchronization and, along with the SSS . Beam Management in 5G NR Beam management procedure is used in 5G NR in order to acquire and maintain a set of TRxP (s) and/or UE beams which can be used for DL and UL transmission/reception. As shown 5G user plane consists of PHY, MAC, RLC and PDCP layers. There are 5 subcarrier spacing configurations = 0. In this document, we will focus on cell search procedure in New Radio (NR)-5G. More information. Based on this measurement report, the eNB will add the 5G node for the mobile using X2 signalling (SgNB Addition procedure). UE synchronization procedure fills N1 message PDU Session Modification command with QoS Descriptions, QoS Rules, and EPS Bearer Context from received QFI, QoS rule ID, and EBI respectively. The 5G RRC connection setup procedure covers messages exchanged between UE and 5G RAN (5G Radio Access Network). Abstract and Figures Synchronization in the time-frequency domain for the fifth-generation (5G) new radio (NR) takes the fundamental steps as in all mobile networks to have user equipment (UE). The synchronization signal block provides the UE with the ability to perform frame and symbol synchronization, which means the UE can discover the presence of a downlink 5G signal and start making sense of it. RACH: Random Access procedure is used for uplink synchronization and RRC Connection. lets discuss Initial acquisition process. 5G Explained: Initial Acquisition Procedures in 5G NR 17,422 views Mar 9, 2020 175 Dislike Share MATLAB 388K subscribers This video discusses initial acquisition procedures starting with cell. 5G NR Random Access Procedure CBRA. Time synchronization (in terms of symbol-level and slot-level) andfrequency synchronization are also realized via PSS/SSS. If any of these procedures fail, the UE will restart the whole procedure with another 5G cell. The 5G system handles TSN service requests through its internal protocols and procedures. SCH includes P_SCH and S_SCH. This paper investigates the performance of 5G NR synchronization procedure with imperfect channel state information, and evaluates and investigates the coverage probability and the ergodic capacity of the 5GNR systems in different scenarios. But that is the only similarity. In this video, you'll learn about the synchronization signal block (SSB) in 5G New Radio (NR). The Figure-1 depicts 5G User Plane protocol stack and Control Plane protocol stack. synchronization in new network scenarios. However, the overall RA duration is too long, especially for a moving terminal because the synchronization parame-ters and best beam pairs need to be reselected periodically. Synchronization Signal / Physical Broadcast Channel (SS/PBCH) Blocks are used during the cell search procedure, i.e. The 5G beam management procedures in 5G has have been divided into three phases :-P1 procedure "SSB beam/ Initial Tx Beam sweeping": Before a data flow is enabled in the scheduler, Periodic SSB beam scanning is implemented on the base station side in a certain interval (the SSB periodicity). In this video, we explain how to measure the synchronization of 5G networks and discuss the results from commercial 5G networks conducted with the R&SROMES4 real-time analysis software. 38.300 - 5.2.5.3 defined 5G/NR as follows. In 5G NR, Cell search concept is similar to what it is in LTE in terms of decoding Primary Sync Signal ( PSS ) and Secondary Sync Signal ( SSS ) to the Physical . In the proposed procedure , the duration of RA is reduced. The two main types of synchronization requirements that are relevant for 5G networks are those that depend on the radio network operation and those that depend on the supported services (application-driven requirements). This video discusses initial acquisition procedures starting with cell search. A simulation on downlink synchronization is performed . Enabling a terminal to have a fast cell search and synchronization process is crucial for 5G where much wider bandwidths compared with that of 4G will be available for a terminal. 4. 5. 5G: Initial access and Registration procedure. But after Rel-16, 3GPP introduced new 2-step RACH procedure to reduce the latency of RACH Procedure. Figure 1: Synchronization in new network scenarios The two main types of synchronization requirements that are relevant for 5G networks are those that depend on the radio network operation and those that depend on the supported services (application-driven requirements). 1 View 3 excerpts, cites methods Residual Frequency offset Estimation Scheme for 5G NR System 5G Explained: Initial Acquisition Procedures in 5G NR. A simulation on downlink synchronization is performed. By acquiring the primary and secondary synchronization signals (PSS and SSS), you can see the timing and the knowledge of the physical cell identity. It will decode MIB. UE tries to decode PBCH. Here PHY is physical layer i.e. UE needs to select the network and determine to which public land mobile network (PLMN) to attempt registration. This is type of a handshake to get uplink synchronization for the mobile. Cell search is the procedure by which a UE acquires time and frequency synchronization with a cell and decode the Cell ID of that cell. During cell search, the UE acquires time/frequency synchronization and PCI. Enabling the selection . in LTE we have a bit mixed CP and UP functions between different network nodes; in 5G we have a full CP/UP split, with many CP network functions and UPF, doing solely data plane processing; Thirdly, in 5G we have some new functionality not present before, like: network slicing implying different configurations of RAN. The UE has to decode Primary Sync Signal and Secondary Sync Signal to decode time slot information and physical cell id. Method #2: 5G to 4G Release with Redirection. Below steps tells the overall 5G NR Cell Search and System Acquisition Procedure : 1. Maintains session states in an external centralized database for stateless operations. This thesis focuses on the synchronization process and the 5G NR radio access procedure. I am reading the example of 5G toolbox about NR Synchronization Procedures. Cell search is the procedure by which a UE acquires time and frequency synchronization with a cell and decode the Cell ID of that cell. Time and phase synchronization is particularly important in 5G networks. In this method, N26 interface between AMF and MME use Forward Relocation procedure and session management context and user plane tunnels in core network are exchanged over from SMF/UPM to MME/S-GW. This thesis studies the innovative synchronization methods for 5G. Random Access Procedure is performed in the following five events SSB plays a fundamental role in the initial access procedure. Other 10 subcarriers do not hold synchronization sequences. TRxP stands for Transmission Reception Point. In a case when UE powers ON, initial registration is performed. It supports very important functions, such as carrying cell ID (identifier), time-frequency synchronization, indicating symbol level/time-gap level/frame timing, cell/beam signal strength/signal quality measurement, etc . Cell search is the procedure by which a UE acquires time and frequency synchronization with a cell and detects the Cell ID of that cell. 2. Meeting timing and synchronization requirements in 5G is a key requirement that is gaining increasing attention among operators. Alepo AUSF provides authentication support for 5G services. UE search for Synchronization Signals when scanning for a cell to camp on. There is consequently a need to devise an initial cell search and synchronization procedure suitable for 5G systems. This thesis focuses on the synchronization process and the 5G NR radio access procedure . UE will get downlink synchronization after successfully decoding SSB. UE needs to register with the network to get authorized to receive services, to enable mobility tracking and reachability. Itfollows a similar two-step cell identification procedure as in LTE, via detectionof primary synchronization signal (PSS) and secondary synchronization signal(SSS). R&STSMx Product information. DL Synchronization and Cell/Network Selection: Cell search is the procedure by which a UE acquires time and frequency synchronization with a cell and decodes the Cell ID of that cell. . This webinar examines the topic network synchronization and describes a practical test procedure to make accurate measurements. Manages authentication confirmation timeout. After presence and timing have been established, the UE decodes the broadcast channel and reads the content of the master information block. 4, with the corresponding subcarrier spacing being 15 2 kHz. In the 5G network, it performs various actions: Handles routing based on SUCI and SUPI. It covers Random Access Procedure initialization, Random Access Resource selection, Random Access Preamble transmission, Random Access Response reception, contention resolution, and the . The random access procedure is performed by the UE for the UL synchronization and Radio Resource Control (RRC) connection. We study the existing algorithms for time and frequency synchronization . 5G Timing and Synchronization Handbook. Reference model for the 5G transport network and deployment scenarios. This paper investigates the performance of 5G NR synchronization procedure with imperfect channel state information, and evaluates and investigates the coverage probability and the ergodic capacity of the 5GNR systems in different scenarios. Li Guo, in 5G NR and Enhancements, 2022. Data of 38400 point lengths in the post-downsampling half frame were selected for comparative analysis. I have a question about in 5G NR, how the receiver determine the best transmitting beam using SSB. The most common way to implement the Synchronization is i) Create a predefined signal (a predefined data sequence : This signal is called Sync signal) ii) Put the signal into a specific OFDMA symbol in a specific subframe and transmit The random access procedure is performed by the UE for the UL synchronization and Radio Resource Control (RRC) connection. Supports re-synchronization procedure. Have you ever considered synchronizing the 5G base stations of operators? This paper investigates the performance of 5G NR synchronization procedure with imperfect channel state information, and evaluates and investigates the coverage probability and the ergodic capacity of the 5GNR systems in different scenarios. In 5G NR, Cell search concept is similar to what it is in LTE in terms of decoding Primary Sync Signal ( PSS) and Secondary Sync Signal ( SSS) to the Physical Cell ID (PCI). By acquiring the primary and secondary synchronization signals (PSS and SSS), you can see the timing and the knowledge of the physical cell identity. If UE is not able to detect and decode, it will go to step 1. Accepted Answer: Sriram Tadavarty. 6.1.2 Design of SSB. Before the UE start sending the data in Downlink and Uplink , it acquires the system. 5G NR MAC Procedures: Random Access Procedure: Get the initial uplink grant for UE (User Equipment) and help in performing synchronization with the gNB. . GoTechnical LTE. Reference signals are used for beam management. This video shows the importance and benefits of synchronizing the gNodeBs of one operator operating in TDD mode and explains how the synchronization of all operators' gNodeBs affects measurement results. 3. From the moment UEs are first powered "on" until they are powered "off", most LTE UEs execute the same series of steps in order to provide service for subscribers. Downlink synchronization is obtained after successfully decoding SSB, in order to establish uplink synchronization and RRC connection, UE has to perform RACH random access procedure. Non-Standalone 5G call flow Standalone 5G call flow 5G Mobility and Carrier Aggregation Procedure 1 hour Synchronization and System Information Acquisition Synchronization and System Information Acquisition Overview PSS and SSS Synchronization Decoding the MIB in the PBCH Locating SIB1 using the MIB Parameters. UE tunes into a specific frequency. The SSB is comprised of the primary and secondary synchronization signals (PSS and SSS) as well as the broadcast channel (BCH), which includes the master information block (MIB). Synchronization Procedure in 5G NR Systems Abstract: Similar to all mobile communication networks, synchronization in the time-frequency domain is a fundamental step that allows a fifth-generation (5G) new radio (NR) user equipment (UE) to properly receive and transmit its data. The synchronization in time-frequency domain is a crucial step for the fifth generation (5G) new radio (NR) systems. The SSB is comprised of the primary and secondary synchronization signals (PSS and SSS) as well as the broadcast channel (BCH), which includes the master information block (MIB). Requirements on transport networks to support 5G networks and details on the interfaces between the 5G entities and the transport network Gsup.5gotn : use of existing OTN technology to address the requirements to support 5G transport in the fronthaul . [9] discussed the synchronization procedure in 5G new radio (NR) and identified that. In the synchronization process, the computational complexity of the different algorithms is analyzed when \mu = 1, sub-carrier interval 30 kHz, sampling frequency 122.88 MHz. Function, Release 2021 what we had in LTE when UE powers on, initial is. 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