Technical Overview of 3GPP LTE| Hyung G. LTE-A Frame Structure Yang Chamsol INHA UNIVERSITY Contents 1. This episode of Field Journal we’ll go deep into the TDD-LTE frame structure in the CBRS spectrum band, and touch on the different 4G LTE deployment methods that are used in different environments. Modulation: OFDM with QPSK, 16 QAM, 64 QAM 10. 25 MHz to 20 MHz. Space between the chhanel and the next channel is always same regardless of the system bandwidth of the LTE band. Answer-1:The difference lies in the LTE frame structure in both the FDD and TDD versions of the LTE. Each subframe composed of 2 time slots. It only shows the structure of one frame in time domain. SI-1 transmitted every 80ms, SI-2 every 160ms and SI-3 every 320 ms. The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD carriers only. Transmit Diversity & Receive Diversity . 211 frame structure type 2 (DL / UL / SSF) Filter. There are two types of LTE frame structure: 1. The physical frame structure of LTE is a combination of time domain OFDM symbols and frequency domain subcarrier indices. 18th frame) is used as control frame. TETRA Frame Structure. 11 devices. Most of technical materials (or white papers) write several pages in words based on these. 7 Physical random access channel for the details. 1. 211 V16. SAE’s main component is the Evolved Packet Core, also known as an EPC. Access Procedure & Signaling. Protocol & Architecture. The air interface described in this book covers the concepts of LTE frame structure, downlink and uplink scheduling, and detailed illustrations of the data flow across the protocol layers. 7. A frame has a duration of 10 ms and consists of 10 subframes. 2 Frame Structure and Physical Resources 11 4. Figure 2. In the frame structure, there are 14 TTIs (Transmission Time Intervals), in which four DMRS (Demodulation Reference Signals) and. 5G NG Frame Structure 5G NR is similar in many ways to 4G OTA. Selection of a frame formatLTE: Key Features (Cont) 8. PMP frame to this LTE frame, the downlink start has to align to the beginning of subframe 4, not subframe 0. 10 such subframes form. Figure 1: LTE Generic Frame Structure [3] 2. 9. S-GW = Serving Gateway – Node that terminates the interface towards E-UTRAN. 211) defines the Frame Structure. Mapped to 72 active sub carriers(6 resource blocks), centered around the DC subcarrier in slot 0 (Subframe 0) and slot 10 (Subframe 5) in FDD. 4G/LTE - Reference Signal. It consists of a 10 ms radio frame divided into 20 slots, each with a duration of 0. Each subframe composed of 2 time slots. The period of one LTE radio frame structure is 10ms. Resource Block of RACH in LTE Frame Structure : Preamble length is 6RB , 1 RB=180KHZ, so 6RB=1. Myung 17 Frame Structure • Two radio frame structures defined. When data is. A TDD frame structure is shown in below figure. Expected in the 2008 time frame, LTE is a 3GPP standard that provides for an uplink speed of up to 50 megabits per second (Mbps) and a downlink speed of up to 100 Mbps. Hence there are total 20 slots in a radio frame. A TDD frame structure is shown in below figure. 10 subframes (= 20 slots) are fit into 10 ms in LTE while various number of slots depending on Numerology are fit into 10 ms in 5G NR. Figure 10: Frame structure in LTE. The Fig 1: Shows the position of RACH in the Uplink LTE channel Structure. Transmit Diversity & Receive. As described above, in 5G/NR multiple numerologies (waveform configuration like subframe spacing) are supported and the radio frame structure gets a little bit different. Dynamic part is called as SIB and is mapped on RRC SI messages (SI-1,2,3,4,5,6,7,8,9,10,11) over DL-SCH and transmitted using PDSCH at periodic intervals. 5% LTE Duplex Neutral 82. This generic frame structure is used with FDD. The number of symbols per slot depends on the size of the cyclic prefix. What is an LTE frame structure? In LTE, DL and UL transmissions are organized in radio frames of 10 ms each. Long Term Evolution (LTE) is the latest buzzword on everyone’s lips, but are you as conversant with the LTE architecture as you would like to be, or — more importantly —. The Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). End-to-end simulation and conformance testing. LTE has radio frame of duration 10ms consisting of 10 subframes. 1. Each radio frame is divided into 10 subframes (each being 1ms long). On-Demand Demo. NR frame structure supports TDD and FDD transmissions and operation in both licensed and unlicensed spectrum. The overall feature of NB IoT is now outlined in 3GPP RP-151621 as follows. This is then divided into a total of 20 individual slots. com LTE Frame structure. The figure below shows the structure of the downlink physical channel and downlink physical signals. The frame structures for LTE differ between the Time Division Duplex, TDD and the Frequency Division Duplex, FDD modes as there are different requirements on segregating the transmitted data. In LTE base station is referred as eNodeB and mobile subscriber is referred as UE. The resulting location of the process is as shown in Reference Signal section of Downlink Frame Structurepage. Download scientific diagram | LTE Frame Structure for FDD Systems. 5% LTE TDD Only 7. The LTE packet frame structure is similar to other OSI models. Each subframe has two slots. • Three PSS sequences are used in LTE, corresponding to the three physical layer identities within each group of cells. 33 4. • A resource block (RB) spans 12 subcarriers over a slot duration of 0. 2. The air interface described in this book covers the concepts of LTE frame structure, downlink and uplink scheduling, and detailed illustrations of the data flow across the protocol layers. Basic time unit Ts for BW of 20MHz, (1/15000)*2048 seconds equal to 32. The first choice has the advantage of compatibility with the LTE frame structure used by French networks and The second choice is not compatible with LTE. LTE frame stru. The Evolved UMTS Terrestrial Radio Access Network (E-UTRAN). 211 frame structure type 2 (DL / UL / SSF) Filter. This type of radio frame has duration of 10ms and consists of 20 slots, with each slot having equal duration of 0. A slot consists of 7 ofdm symbols (if normal cyclic prefix is used) separated by. Time Domain Correlation. We also have a separate sec. Since LTE-NB is considered as a LTE family, it has some commonalities with the legacy LTE as follows : The length of a subframe is 1 ms. In TDD there are about 7 frame configurations, based on different DL/UL. In this page, I will describe on NR Frame Structure that is specified in 3GPP specification (38. INHA UNIVERSITY. 2. Each slot can have either 14 OFDM symbols or 12 OFDM symbols based on cyclic prefix type. LTE frame structures used for TDD 36. The following text shows the frame structure of each type. 2 Initiation over S1 14 6. A standard LTE system architecture consists of an Evolved UMTS Terrestrial Radio Access Network, more commonly known as E-UTRAN, and the System Architecture Evolution, also known as SAE. Uplink and downlink configurations are used to create subframes (0 to 6). Therefore, fitting the flexible physical layer design of NR around that of LTE is needed in order to deploy DSS on a shared spectrum. 11 in order not to prevent the communiction between existing 802. (I created following subframe structure using LTE Resource Grid and edited to fit the topics of this page)A frame has a duration of 10 ms and consists of 10 subframes. Determine frame synchronization and cell identification (cell search procedure) based. Each LTE frame has 10 sub-frames (1 ms each) while each sub-frame is further divided into 2 slots (0. Frame structure of the LTE resource grid. A new LTE frame type (i. LTE frame structure 50 Resource Blocks 7 Symbols RB = 12 Sub-carriers x 7 Symbols 12 Subcarriers 0 49 (normal)Current radio frame structures in Long-Term Evolution (LTE) and New Radio (NR) have some restrictions. LTE Frame Structure Made Simple. • A radio frame has duration of 10 ms. 5 ms. 6 Mobility. 1. Type 2: used for the LTE TDD systems. 2The LTE-Frequency Division Duplex (FDD) mode was employed in this study, as used by the majority of operators in the world [18]. In the LTE standard (E-UTRA Citation 2019), OFDM signals are specified by three parameters, namely, the number of subcarriers or the Fast Fourier. The first choice has the advantage of compatibility with the LTE frame structure used by French networks and The second choice is not compatible with LTE. This Sync detection is done every 5 ms. LTE Frame structure in muted MBSFN subframe based DSS. 5 ms. This video has been taken from our LTE Air Inte. The purpose of different frame structures: flexible, multiple uses. 3GPP LTE Frame Structure 2, Applicable to TDD. But now, with the introduction of LTE system toolbox [7], the parameters. Design verification. If the PSS is successfully detected, it means the start of the LTE frame is found and frequency synchronization can be established. LTE Introduction. When an LTE system in one country is within the footprint of a satellite service owned by another country, to prevent the interference from the satellite services, the LTE system will avoid using the overlapped frequency bands. 1. As shown in Figure 1, LTE frame trans-The detailed radio frame structure for both frame structure types is shown in Figure 2. A phone must typically perform the following tasks (Figure 5): Acquire a signal on a given LTE carrier frequency. 19/06/2016 0. 5 ms) in the time. 2. LTE frames are 10 msec in duration. – Frame structure type 1 (FS1): FDD. The Input Sampler samples the inputs NDLRB and NCellID and then propagates the values to the subsequent blocks. The PHY. Frame Duration: The duration of an LTE frame is fixed at 10 milliseconds (ms). There can be a variable number of slots per subframe, with 14 OFDM symbols per slot. To fulfill these requirements, orthogonal frequency division multiplex (OFDM) was selected as the basis for the PHY layer. When data is available in the LAA transmission queue, the basestation employs energy detection to sense the wireless channel and determine whether it is busy or idle. There are six time units: frame, half-frame, subframe, slot. frame structure type, number of antennas, number of symbols in PDCCH and the scaling factor Ng. LTE defines a generic frame structure that applies to both DL and UL for FDD operation. Frame Structure: MAC-LCID. 10 mili second radio frame consists of Downlink subframe, Uplink subframe and Special subframe. For the FDD mode of operation, there are two carrier frequencies, one for uplink transmission (f UL) and one for downlink transmission (f DL). 2. A. Type 1, applicable to FDD- Here there are. RACH Configuration . Learn the basics behind 5G NR waveforms, frame structure, and numerology. But in NR, the number of slots varies according to the numerology. LTE TDD frame structure is shown below. As described above, in 5G/NR multiple numerologies (waveform configuration like subframe spacing) are supported and the radio frame structure gets a little bit different depending on the type of the numerology. Since the modulation format is OFDM (regular OFDM for the downlink, and DFT- precoded OFDM in the uplink. When an LTE system in one country is within the footprint of a satellite service owned by another country, to prevent the interference from the satellite services, the LTE system will avoid using the overlapped frequency bands. Each LTE frame has 10 sub-frames (1 ms each) while each sub. 101: Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception - 3GPP TS 36. when μ = 0. 11 frequency region. This provides several benefits, including:“10ms” version, and gives greater opportunity for uplink/downlink flexibility. 5 ms Sub frame duration=1 ms Basic time unit Ts for BW of 20MHz, (1/15000)*2048 seconds equal to 32. Learn the basics behind 5G NR waveforms, frame structure, and numerology. Please share this video with your friends. crostrip line with a 0. Radio frames and subframes are of fixed lengths. . The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD carriers only. Frame Structure The following figure shows the frame structure of an LTE signal (FDD). dl-UL-TransmissionPeriodicity. 1 Numerologies, Frames, Subframes, and Slots 11 4. 211). LTE Frame Structure Types. Each slots can have a number of symbols (7 symbol for normal CP/ 6 for extended CP for LTE and 14 OFDM symbols in 5G). Please share this video with your friends. Channel Mapping. A TDD frame structure is shown in below figure. Low Layer Procedures DCI HARQ PHY Processing MIMO MIMO/CA(Big Pict. 10 Variable Subcarrier Spacing Slot configuration 0 Subcarrier spacing (kHz) 15 30 60 120 240 Symbol duration (no CP) (μs) 66. of slots=20. 5ms each. Figure 1: LTE Generic Frame Structure [3] 2. Frame Structure Downlink Uplink Reference Signal. Slot duration=0. The frame structure below ( Figure 1) is applicable to TDD. Figure 1 shows frame structure type 1, which can be used in either full-duplex or half-duplex FDD mode. Time Domain transmission pattern of SS Block in NR is more complicated than LTE SS Block (Actually LTE has only one pattern of SSB Transmission in Time Domain as shown in LTE Frame Structure. For example, TDD networks share the same radio spectrum for the downlink (DL) and uplink (UL) transmissions which means scaling needs to be applied to the expected throughputs. 27/06/2023 0. LTE supports two radio frame structures [15]: 1. One slot is defined as 14 OFDM symbols, which corresponds to once a frame or one millisecond in LTE. Simplified LTE network elements and interfaces 3GPP TS 36. Performance analysis of OFDMA in LTE. Page 2 - 2 - INHA UNIVERSITY. The figure depicts LTE-M frame structure similar to LTE technology. Three different types of physical channels are defined for theFigures 1 and 2 show the frame structures referenced in Table 1 . Hence there are total 20 slots in a radio frame. LTE Frame Structure Made Simple. Frame Structure Type2 Configuration. The following are the two types of radio frame structures: (i) Type 1: supports FDD mode. What is VSWR. Additionally, we assume that the LTE communications use Time Division Duplex (TDD), in which the radio frame structure is illustrated in Figure 2. 7 Summary 184 References 186 9 Cell search and reference signals 187 9. Even though they use a little bit different name, in all cellular technology (CDMA, GSM, WCDMA, LTE) there is a specific signal that perform the same function. 1-2: Frame structure type. This video looks at OFDM waveforms, and the different subcarrier spacings supported in 5G NR. It is valid for both half duplex, and full duplex FDD modes. The cyclic shifts are generated based on cell-identity group number, which. Number of Transmit Antenna. The GSM frame structure is designated as hyperframe, superframe, multiframe and frame. In 5G/NR, we don't have any predefined pattern. Download scientific diagram | shows the frame structure of LTE V2X. CellAdvisor LTE frame analysis — unicast (PDSCH) and broadcast (MBMS) allocations Performance MBMS-SFN services are static and do not vary over time. Frame Structure2. We will ignore the spatial domain for now and focus on the time-frequency plane. In recent time, much data is needed inLong Term Evolution (LTE) is the next step forward in cellular 3G services. LTE FDD. 4G/LTE - PHY Channel PSS (Primary Synchronization Channel) PSS is a specific physical layer signal that is used for radio frame synchronization. (You will understand this time interval if you look at the LTE Downlink frame structure explained at DL FrameStructure section). LTE frame structure is enhanced in 5G New Radio (NR) to support users with highly diverse service requirements for enhanced Mobile Broad Band (EMBB), Massive Machine Type Communications (MTC) and. This video looks at OFDM waveforms, and the different subcarrier spacings supported in 5G NR. Type 1, applicable to FDD- Here there are. LTE tutorial videos, articles, and code examples introduce key LTE concepts and effective techniques and workflows for LTE physical layer development including: Waveform generation. You would see that the length of PRACH preamble varies depending on the preamble format. It improves on those standards' capacity and speed by using a different radio interface and core network improvements. 211 5. ) Precoding Fading Power Control PUCCH. The duration of one LTE radio frame is 10 ms. LTE RACH in Details . Leveraging its extensive experience in 3G markets, Anritsu has developed the MD8430A as a powerful LTE protocol R&D test platform enabling developers bring LTE terminals to market as fast as possible. One sub frame is composed of 7 normal time slots used for downlink/uplink and 3 special time slots. • LTE Frame Structure • LTE Resource Grid • LTE Bandwidth/Resource Configuration • LTE Channels • LTE Protocol Architecture . For example, the public network has more downlinks, and the private network or private network has more uplinks. I think if we note to general sub-carrier in distinct LTE Bandwidth we are able to identified the answer. Two duplex schemes FDD and TDD are supported. The evolved packet core communicates with packet data networks in the outside world such as the internet, private corporate networks or. The indices m0 and m1 are derived from cell ID group , which is defined as “Table 6. No. LTE Frame Structure SU0 SU1 SU2 Superframes (10 ms) SF0 SF1 SF2 SF3 SF4 SF5 SF6 SF9 Subframes (1ms) Ref: Rhode and Schwarz, “UMTS Long Term Evolution (LTE) Technology Introduction,”. In TDD there are about 7 frame configurations, based on different DL/UL. g. LTE Frame Structure. . 0 MHz, 5. The LTE frame structure for the FDD and TDD schemes was discussed in Chapter 9. Network Components for MBSFN(eMBMS) For implementing eMBMS, a couple of components are added in the core network side as shown below. A new LTE frame type (i. design, LTE frame structure dedicated some channels for data and they are called data channels while others for control information, known as control channels. - available for PMCH (Physical Multicast Channel) LTE Resource Grid. 3) is used for Frequency Division Duplex (FDD) mode; however, the type 2 structure (Fig. Spectrum utilization efficiency of LTE and NR bands with and without cross-band DSS. Raad Farhood Chisab. Type 2: Used in LTE TDD. Suresh Sahni. Tables defining Uplink Frame Structure . One is the type which is more like current LTE/LTE-Advanced and the other type is for new waveform. Figure 4. 4. 2 LTE Frame Structure The frame structure is dependent on the duplex scheme applied in the spectrum. Slot Structure. Alternative PDSCH DM-RS pattern when LTE CRS rate matching is configured; 7. Bandwidth: LTE supports different bandwidth configurations, such as 1. As shown in Figure 1, the total length of downlink pilot time slot (DwPTS), GP, and uplink pilot time slot (UpPTS) fields is equal to. dl-UL-TransmissionPeriodicity: Periodicity of the DL-UL pattern. 5 ms Sub frame duration=1 ms. The Evolved Packet Core (EPC). The maximum number of subframes in one. LTE uses the concept of a resource block, which is a block of 12 subcarriers in one slot. Uplink physical channels and uplink physical signals are as follows. 3. Note: there are much more content (other technologies), find out there:. e. 1. This is a cluster-based frame structure alignment, where the instantaneous uplink and downlink traffic situation. So if the system. Hi All,There are lot of new member joined so i am providing the links of ORAN videos whi. In TDD there are. The useful symbol time is T u. Source: 3GPP TS 36. In LTE the physical layer is driven by OFDMA in the downlink and SC-FDMA in the uplink. i) Time duration for one frame (One radio frame, One system frame) is 10 ms. NR Frame structure in muted MBS subframe based DSS. Frame Structure; LTE-NB : Physical Layer : Uplink : SC-FDMA Baseband Signal Generation; LTE-NB : Channel Structure; LTE-NB : HARQ; LTE-NB : Multi Carrier Operation (Anchor. Contents. Technical Overview of 3GPP LTE| Hyung G. 5 kHz UL shift . The air interface described in the chapter covers the concepts of LTE frame structure, downlink and uplink scheduling, and detailed illustrations of the data flow across the protocol layers. 101: “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception” - 3GPP TS 36. The frame structures for LTE differ between the Time Division Duplex, TDD and the Frequency Division Duplex, FDD modes as there are different requirements on segregating the transmitted data. 27/06/2023 0. Historically, CPRI is mainly designed for 2G/3G and eCPRI is designed for LTE and NR, but it is all up to network infra structure vendors which type of CPRI (CPRI or eCPRI) to use for which radio access technology (i. ms each) while each sub-frame is further divided into 2 slots (0. Type 2: used for the LTE TDD systems. 5: Gable Frame Steel Structure. Frame Structure 2. · Sub-frame size= 1 ms. The PSS & SSS generation generates PSS,. cyclic prefix). (ii) Type 2: supports TDD mode. The minimum unit being frame (or TDMA frame) is made of 8 time slots. Moreover, each. For example, S-CCPCH is transmitted at the multiples of 256 chips delay from the start of CPICH(Start of frame timing). They areThis site is for everything on 4G/LTE. Now (as of Sep 2017) 3GPP official specification (38. If you are interested in some historical aspects of the 5G Frame structure, it would be good to read through this. One resource block is 0. RACH is responsible for the Random-Access process. In this video we discuss three focus areas; Downlink Frame Structure, Uplink Frame Structure, and TDD Options. There are seven different Type 2 frame structures as shown in the figure, which can be changed flexibly. It introduces several changes in terms of frame structure and slot formats compared to previous generations like 4G LTE. – Frame structure type 2 (FS2): TDD. So, the standards of wireless communication are taking aLTE Introduction. Additionally, NR supports transmission based on mini-slot (a fraction of a. In a nutshell, the basic air-interface design of LTE can be described as a single carrier with fixed bandwidth (with a small set of candidate values) of a single numerology and rigid frame structure, with fixed always-on CRS for all transmission schemes, and inflexible control region and initial access channels. Frame structure type2 is applicable only to TDD and is provided for compatibility with legacy UTRA TDD systems. This is the same as in LTE, facilitating NR and LTE coexistence. LTE frames are 10 msec in duration. Instead, we can define the pattern in much more flexible way using several parameters as shown below. PHICH (Physical Hybrid ARQ (Automatic Repeat reQuest) Indicator Channel) PDCCH (Physical Downlink Control Channel) Available for PDSCH (Physical Downlink Shared Channel) TDD guard period in special subframe. e. IP packets are reformed in the PDCP SDUs and flow through the RLC, MAC, and PHY layers. There are two cell search procedures in LTE: one for initial synchronization and another for detecting. LTE frame structure. LTE. The performance comparison of the different 5G NR numerologies at various speeds and frequencies and within most common 5G scenarios was made with 1000 transmission time intervals (TTI) per numerology, using the PHY layer parameters of LTE and adjusting the frame structure with the parameters of the. Hence each subframe has 2 slots. Type 2 LTE Frame Structure. One slot is defined as 14 OFDM symbols, which corresponds to once a. e, 2G/3G, LTE, NR). LTE: Key Features (Cont) 8. Timing Advance in LTE . One slot is defined as 14 OFDM symbols, which corresponds to once a frame or one millisecond in LTE. . 2. Frame Structure 10ms frames 10. 36. 5MHz (6 RBs in frequency per frame) to 20MHz (100 RBs in frequency per frame), being 10MHz the most commonly deployed. 3 Downlink frame structure 190 9. Figure 1 : Downlink Physical Channel Structure. Figure 3 shows the frame structure for LTE in FDD mode (Frame Structure Type 1). Each LTE frame has 10 sub-frames (1. The LTE half-frames are further split into. Determine frame synchronization and cell identification (cell search procedure) based. LTE standard has been published by 3GPP as an extension of UMTS (based on 3GPP standard) and 1xEV-DO (base on 3GPP2 standard. A TDD frame structure is shown in below figure. The LTE half-frames are further split into five subframes, each 1ms long. Figure 1 illustrates the structure of the LTE radio frame. Downlink ※ Reference - 3GPP TS 36. FDD (Frequency division duplex), which uses type 1 frame structure. 4 Frame structure type 2 177 8. Type 1: FDD : Frequency Division Duplex. LTE standard has been published by 3GPP as an extension of UMTS (based on 3GPP standard) and 1xEV-DO (base on 3GPP2 standard) technologies. For the normal mode, the first symbol has a cyclic prefix of length TCP = 160 ⋅ Ts ≈ 5. It does not show any structure in frequency domain. ‘Stand-alone operation’ utilizing for example the spectrum currently being used by GERAN systems as a replacement of one or more GSM carriers. LTE frame structure type 2 (TDD) One radio frame Tf =10 ms 1 radio frame = 10 ms 1 slot = 0. The basic type 1 LTE frame has an overall length of 10 ms. Slot duration=0. 211 for FDD LTE is as follows. The LTE frame structure for the FDD and TDD schemes was discussed in Chapter 9. No of Slots per Sub frame =2. 6 nanoseconds. The biggest difference of any new wireless communication technology starts from physical layer frame structure. Then, theVery Basic understanding of Frame , subframe , slots and OFDM symbolsThe fundamental time unit of LTE transmission is a radio frame, which has a duration of 10 ms. The GSM frame structure is designated as hyperframe, superframe, multiframe and frame. LTE network offers about 300Mbps data.