2) Each subframe has two slots of 0. Type 2 LTE Frame Structure. The design considera-tions are explained below. This new frame structure is designed to make LTE signal similar to WLAN burst. 5 ms. • A resource block (RB) spans 12 subcarriers over a slot duration of 0. As of now, around 16 carriers can be aggregation in. 211 4 Frame structure). The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD carriers only. In order to make use of the overlapped LTE bands, a Downlink Only Frame Structure (DOFS) approach is proposed in this. System Information Blocks are grouped in SI containers. Please share this video with your friends. Type 1 is used as LTE FDD frame structure. 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. 5ms [9]. 5G NR Supports two frequency ranges FR1 (Sub 6GHz) and FR2 (millimeter wave range, 24. - available for PMCH (Physical Multicast Channel) LTE Resource Grid. Telecom. 2. The type 1 structure (Fig. Frame Structure Downlink Uplink Reference Signal. Performance Results. Because of variable subcarrier spacing, the. Then why we need to care of this kind of thing in LTE-Unlicensed technology ? Basically LTE Unlicensed technology (e. LTE frame is 10 ms in duration and consists of 10 subframes. 211 for FDD LTE is as follows. In section 5, Simulation results are given and we finally conclude in Section 6. Myung 17 Frame Structure • Two radio frame structures defined. 5G Frame Structure in Detail . . Type 1 radio frame has a duration 10 ms and consists of equally sized 20 slots each of 0. 0 (2019-02): a. LTE Frame Structure One element that is shared by the LTE Downlink and Uplink is the generic frame structure. 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. OFDMA System Model LTE (Long Term Evolution) uses OFDMA and SC-FDMA atThe first one is defined for FDD mode and it is called frame structure type 1. Demodulating an LTE Signal in MATLAB with LTE System Toolbox. In this video we discuss three focus areas; Downlink Frame Structure, Uplink Frame Structure, and TDD Options. LTE frame structure. The remaining six symbols have a cyclic prefix of length TCP = 144 ⋅ Ts ≈ 4. 16d and 802. These two frames, which are incompatible with each other, will require new functionalities to avoid interference at borders. This is the same as in LTE, facilitating NR and LTE coexistence. The uplink channels are PRACH, PUSCH and PUCCH. End-to-end simulation and conformance testing. The uplink and downlink bands are separated in the frequency domain using a guard band. Alternative PDSCH DM-RS pattern when LTE CRS rate matching is configured; 7. DCI DCI . · It consists in a category of Frame 2. Performance Results. Full size image. Page 2 - 2 - INHA UNIVERSITY. Simplified LTE network elements and interfaces 3GPP TS 36. V. OFDMA System Model LTE (Long Term Evolution) uses OFDMA and SC-FDMA at downstream and upstream for downlink and uplink transmission. LTE tutorial videos, articles, and code examples introduce key LTE concepts and effective techniques and workflows for LTE physical layer development including: Waveform generation. A cell identity is derived from a physical layer cell identity group. Hybrid ARQ Transmission Short Frame Sizes of 10ms and 1ms faster feedback and better efficiency at high speed 13. The LTE specifications define both FDD and TDD modes of operation. K. LTE-NB frame structure can be summarized as follows. 19/06/2016 0. The duration of each subframe is 1 ms. between the air interface—transmitted frames on the air—and the actual service data unit (SDU) packets that are coming from the top of the protocol stack. Figure 1 shows frame structure type 1, which can be used in either full-duplex or half-duplex FDD mode. The CRC is then masked with an RNTI according to the owner or usage of PDCCH. Design verification. Let us understand LTE FDD and TDD LTE versions with figures and band example below. Each LTE frame has a duration of 10 ms, and is subdivided into 10 equal-size subframes of 1 ms; each subframe comprises two slot periods of 0. As shown in the figure below, an LTE TDD frame is made of total 20 slots, each of 0. There are two types of LTE frame structure: Type 1: used for the LTE FDD mode systems. LTE frame structure OFDM to address multi-path fading. The frame structure below ( Figure 1) is applicable to TDD. Traditionally, the system models were made using the 3GPP spatial channel model for LTE and a number of parameters have to be varied at the backend. Each subframe has two slots. 4G/LTE - Reference Signal. The beauty of 4G LTE Frame structure (or shall i say the complexity of the same) is that everytime we dig a bit deeper into it we will learn something new about it, atleast that is the case with. •LTE Channel Mapping •LTE Frame Structure •LTE Identities •LTE Power On Scenario •LTE Signals PSS & SSS •LTE System Information •LTE DL Channels: PBCH, PHICH, PCFICH •LTE DL Channels : PDCCH, PDSCH •LTE UL Channels: PUCCH, PUSCH •LTE RACH Procedure •LTE Layer 3-NAS and RRCPHICH (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. A TDD frame structure is shown in below figure. Each radio frame will have a total of ten subframes, each with two time slots. Therefore, fitting the flexible physical layer design of NR around that of LTE is needed in order to deploy DSS on a shared spectrum. A common frame structure as defined by 3GPP TS 38. Downlink. FDD is operated in the paired spectrum (see Sect. The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD carriers only. Choose a configuration with more “D”s in the frame means greater proportion of Downlink Data (normal for most Internet /ISP applications). In LTE TDD, we defined 7 predefined pattern for UL and DL allocation in a radio frame. design, LTE frame structure dedicated some channels for data and they are called data channels while others for control information, known as control channels. Subframes #0 and #5 are always assigned to DL, and subframe #2 is always assigned to UL. 104: “Evolved Universal Terrestrial. 11 devices. The number of symbols per. Ok now on to our Downlink LTE frame structure. Selection of SubCarrier Spacing (SCS) d. In FDD there will be pair of frequencies assigned in the downlink and uplink directions and hence transmissions from multiple subscribes can happen at the same time but on different frequencies as mentioned. However, unlike LTE, which has a fixed subcarrier spacing (SCS) of 15 kHz, 5G NR supports scalable numerology for more flexible deployments covering a wide range of services and carrier frequencies. 10 mili second radio frame consists of Downlink subframe, Uplink subframe and Special subframe. In addition, each subframe is further subdivided into two equal time slots, ie each slot is 0. Bits are transmitted serially. How about SSB? We can. 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. The 51-frame Control Channel Multiframe in GSM. The structure of the HDL LTE MIMO Transmitter subsystem is shown below. • Transmitted on 6th symbol of slot 0 and slot10 of each radio frame on 72 subcarriers centered. Alternative frame structures are defined for use with TDD. 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. MasterInformationBlock ::= SEQUENCE { dl-Bandwidth ENUMERATED { n6, n15, n25, n50, n75, n100},Signal Studio for LTE/LTE-Advanced FDD currently supports only FDD and frame structure type 1. 4G LTE, 5G NR and beyond while continuing to serve as a reliable mobile communication platform in various regions. 4 Frame structure type 2 177 8. Three different types of physical channels are defined for theFigures 1 and 2 show the frame structures referenced in Table 1 . Channel Mapping and UE Categories. LTE Frame Structure Made Simple. 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. 27/06/2023 0. In case of co-site deployment, slot- and frame structures may be aligned to simplify cell search and inter. In section 5, Simulation results are given and we finally conclude in Section 6. A common frame structure as defined by 3GPP TS 38. . The PHY. 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. Answer-1:The difference lies in the LTE frame structure in both the FDD and TDD versions of the LTE. Suresh Sahni. 12. Uplink Frame Structure of LTE-NB can be summarized in the following three tables. There are two types of LTE frame structure: 1. A typical LTE frame is 10 ms (milliseconds) long. The maximum number of subframes in one. Downlink Waveform = OFDMA (There is a subtle differences in waveform generation formula, but almost same) Followings are some of parameters that are different from legacy LTE. 5 ms each. Signal analysis. 1. Figure 1: LTE Generic Frame Structure [3] 2. Type 1 LTE Frame Structure The basic type 1. The duration of each subframe is 1 ms. About 18 such TDMA frames form one multi-frame. LTE Frame Structure A frame, which is a major component in LTE commu-nication, is a two-dimensional grid representing time and frequency. 2 LTE Frame Structure The frame structure is dependent on the duplex scheme applied in the spectrum. Frame Structure - Candidates before 3GPP . There are two radio frames, each one of 10 ms duration. The frame-structured metal mesh conductive film is based on the conductive-coated thin film and forms a narrow strip surrounding the edge of the antenna. PSS is a specific physical layer signal that is used for radio frame synchronization. com LTE Frame structure. This provides several benefits, including:Frame Structure : Uplink; Frequency and Band Table : EUTRA Band and Channel Bandwidth; Frequency and Band Table : EUTRA Band and Frequency Range;. In TDD (Time division duplex) technique we are using, same frequency or frame for both DL and UL but at a different time. Frame Structure Type 1. Each frame composed of 4 time slots. Similar as most of the previous researches [8, 9, 11, 15, 16], only downlink communication is considered in this work. Tables defining Uplink Frame Structure . 3. Transmit Diversity & Receive. of slots=20. Each hyperframe consists of 1024 frames. In TDD there are about 7 frame configurations, based on different DL/UL. i Understanding and Development of Inter-cell Interference Mitigation mechanism in LTE-A Heterogeneous Network Förståelse och utveckling av Inter-interferens Mitigation mekanism i LTE-AVery 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. This frame consists of 20 slots as shown in figure-1. ) Precoding Fading Power Control PUCCH. The LTE specifications define both FDD and TDD modes of operation. 25-20 MHz). 3. A TDD frame structure is shown in below figure. However, unlike LTE-U, LAA use a special physical layer frame structure called Frame Structure Type 3 which didn't exisit before. 7 33. Download scientific diagram | LTE frame structure used with FDD from publication: Experimental investigation on target detection and tracking in passive radar using long-term evolution signal. Slot duration=0. 5: Gable Frame Steel Structure. – Frame structure type 2 (FS2): TDD. So, the standards of wireless communication are taking aThe Fig 1: Shows the position of RACH in the Uplink LTE channel Structure. No. These two frames, which are incompatible with each other, will require new functionalities to avoid interference at borders. The high-level network architecture of LTE is comprised of following three main components: The User Equipment (UE). It was combination of Time Domain, Frequency Domain and the modulation scheme. 4. 2. July 2012. The LTE standard uses Orthogonal Frequency Division Multiplexing (OFDM) modulation to achieve robust transmission in multipath scenarios (Liu et al. 4G, 4. We. When selecting one of the LTE Frame Configuration15 The Figure below shows respective position of the uplink demodulation reference signal in FDD LTE uplink frame structure including sounding reference signal position. LTE frames are 10 msec in duration. Resource Block of RACH in LTE Frame Structure : Preamble length is 6RB , 1 RB=180KHZ, so 6RB=1. RACH stands for R andom A ccess Ch annel. Each symbol on a carrier is called a Resource Element, thus, we can say that LTE frame is made up of Resource Elements. 4 Synchronization signals 191The 5G NR frame structure supports Frequency Division Duplex (FDD) operating during transmissions in the paired spectrum, while Time Division Duplex (TDD) is used for the unpaired spectrum. In FDD, half of the subframes are reserved for uplink and half for downlink in both full-duplex and half-duplex. 55ns. 1 Downlink physical layer The LTE downlink PHY is specified for bandwidths from 1. Demodulating an LTE Signal in MATLAB with LTE System Toolbox. Each radio frame of length Tf = 307200*Ts = 10 ms consists of two half-frames of length Tf = 153600*Ts = 5 ms each. In 5G/NR, we don't have any predefined pattern. The LTE physical layer supports two types of frame structures as types 1 and 2. Particular attention is given to LTE’s use of multiple antenna techniques and to the modulation scheme called single carrier frequency division multiple access (SCFDMA). 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,”. Hence there are total 20 slots in a radio frame. in subframes 0 and 5 of each 10 ms radio frame • Used in initial cell search • Common scheme irrespective to bandwidth simplify the procedure Physical broadcast channel (PBCH) in. This video talks about LTE Physical Layer and LTE Air Interface. 19/06/2016 0. The LTE radio frame for downlink and uplink transmission is long. What is VSWR. LTE Frame Structure Types. 2. 211 V1. It describes the details of the optimization process including performance measurements and troubleshooting mechanisms in addition to demonstrating common. 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. The LTE standard uses Orthogonal Frequency Division Multiplexing (OFDM) modulation to achieve robust transmission in multipath scenarios (Liu et al. The uplink and downlink bands are separated in the frequency domain using a guard band. Radio Frame Structure. Prasad. Type 2: used for the LTE TDD systems. from publication: A modified CA-CFAR method for LTE random access detection | Random Access is an important aspect of mobile. But in NR, the number of slots varies according to the numerology. 2 Frame Structure and Physical Resources 11 4. Hello Experts. In the time domain, one LTE frame has a 10 ms period and consists of 20 slots of 0. 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. It facilitate mixed numerologies including low latency operations. The GSM frame structure is designated as hyperframe, superframe, multiframe and frame. 211 6. The cyclic shifts are generated based on cell-identity group number, which. 211 V16. Yang Chamsol. Modulation: OFDM with QPSK, 16 QAM, 64 QAM 10. OFDM with a cyclic prefix is the basic modulation scheme selected to combat severe frequency-selective multipath fading. (Please refer to diagram for better understanding) 1) In time domain, 1 Radio frame (RF) is of 10 ms. Variable number of OFDM symbols per subframe (different from LTE) frame: 10 ms. 2. For example, S-CCPCH is transmitted at the multiples of 256 chips delay from the start of CPICH(Start of frame timing). 3GPP defines two types of frames based. (shown for 5ms switch point periodicity). Each frame is divided into 10 subframes of 1 millisecond, and the subframe is further divided into slots according to numerology. Frame Structure - Candidates before 3GPP . How about SSB? We can. e. 6 Mobility. 5G frame structures provide a fixed overall structure for defining data block transmission timing. 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. The fre-quency index of an RE maps to an LTE subcarrier, and its time index maps to an LTE symbol. If you can interpret these tables into a correct graphical format, you already understand all the details of Uplink frame structure. For the examples of TDD resource grids for each Subframe DL/UL Configuration and Special Subframe Configuration, see Frame Structure Frame Type 2 Overview section. Raad Farhood Chisab. 4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, and 20 MHz. This site is for everything on 4G/LTE. The figure depicts LTE-M frame structure similar to LTE technology. Primary Synchronization Signal (P-SS) Sequences. TETRA Frame Structure. A total of 504 unique physical layer cell identities are provided. A. (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. - available for PMCH (Physical Multicast Channel) LTE Resource Grid. Slideshow 2210075 by allieIn LTE physical layer, the LTE frame structure is of two types: 1. OVERVIEW The design of the LTE physical layer (PHY) is heavily influenced by the requirements for high peak transmission rate (100 Mbps DL/50 Mbps UL), spectral efficiency, and multiple channel bandwidths (1. In TDD there are about 7 frame configurations, based on different DL/UL. 5 ms repetition period. The LTE packet frame structure is similar to other OSI models. However, regardless of numerology the length of one radio frame and the length of one subfame is same. 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. Hierarchy of Frame Structure : Frame (Radio Frame) --> SubFrame --> Slot (Same. This paper discusses the various options of DSS implementation, including deployment challenges, possible impacts to data rates, and areasIn LTE TDD, we defined 7 predefined pattern for UL and DL allocation in a radio frame. Figure 2 shows frame structure type 2 for the SC-FDMA uplink. The second one is called frame structure type 2 and is defined for TDD mode. 1 Downlink physical layer The LTE downlink PHY is specified for bandwidths from 1. Physical layer. em. Total Frame duration is about 10ms. In recent time, much data is needed inLong Term Evolution (LTE) is the next step forward in cellular 3G services. 7 Summary 184 References 186 9 Cell search and reference signals 187 9. 03255) us. • LTE Frame Structure • LTE Resource Grid • LTE Bandwidth/Resource Configuration • LTE Channels • LTE 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. In the case of TDD operation (frame structure type 2, middle part of Figure 5. 211 frame structure type 2 (DL / UL / SSF) Correct choice of Configuration value is essential when setting the UL/DL ratio for CableFree LTE networks using TDD bands. The number of symbols per slot depends on the size of the cyclic. One slot is defined as 14 OFDM symbols, which corresponds to once a. We discuss LTE basics including the LTE frame structure, OFDMA, Resource elements, Resource blocks and Scheduler Resource blocks. LTE TDD Overview. The LTE physical layer supports two types of frame structures as types 1 and 2. This video looks at OFDM waveforms, and the different subcarrier spacings supported in 5G NR. 4 MHz, 3. • The figure-1 depicts overall time frame structure used in NB-IoT AS (Access Stratum). m1” (see appendix 2). 5 ms. Scheduling of UL resources is necessary depending on the amount of data to be transmitted by UL. LTE FDD uses 10ms frames, divided into 20 sub-frames or slots (of 0. SAE’s main component is the Evolved Packet Core, also known as an EPC. There. As shown one hyperframe cycle consists of 1024 hyperframes. RACH Configuration . LTE-M Frame Structure. Both use OFDMA. As shown in the diagram, This radio frame is made up of two half frames, each lasting 5ms, for a total frame duration of around 10ms. Instead, we can define the pattern in much more flexible way using several parameters as shown below. Low Layer Procedures DCI HARQ PHY Processing MIMO MIMO/CA(Big Pict. Type 2: used for the LTE TDD systems. 101: “Evolved Universal Terrestrial Radio Access (E-UTRA); User Equipment (UE) radio transmission and reception” - 3GPP TS 36. This application note describes the Long Term Evolution (LTE) of the universal mobile telecommunication system (UMTS) standard by the 3rd Generation Partnership Project (3GPP). Frame Structure Type2 Configuration . LTE RF/PHY RF Measurement. FDD downlink frame structure detailed; TDD frame structure; LTE (any OFDM/OFDMA) band is made up of multiple small spaced channels and we call each of these small channels as “Sub Carrier”. 1. This generic frame structure is used with FDD. 𝜇Each subframe consists of 2 slots of 14 OFDM symbols each. Calculation: 1 Subcarrier of PRACH preamble =1. LTE (telecommunication) In telecommunications, long-term evolution ( LTE) is a standard for wireless broadband communication for mobile devices and data terminals, based on the GSM / EDGE and UMTS / HSPA standards. 5 ms each). WiMAX physical layer Frame Structure as per 802. Download scientific diagram | LTE Downlink eMBMS subframe structure: eMBMS subframes (1, 2, 3, 6, 7, 8) and non-eMBMS subframes (0, 4, 5, 9) in an LTE Frame, where. Just take a look at the overall uplink slot structure. 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. One is the type which is more like current LTE/LTE-Advanced and the other type is for new waveform. dl-UL-TransmissionPeriodicity. A brief description of the model is provided. 25 to 52. TD CP Sub Carrier of Configuration Symbol Length each RB 160 @ Slot 0 Normal f=15k CP Hz 144 @ Slot 12 7 1-6 Extended f=15k 512 @. LTE system basic parameters and LTE Frame structure: Frame Size=10ms No. 5 ms. Slot Structure. Hierarchy of Frame Structure : Frame (Radio Frame) --> SubFrame --> Slot (Same as in 5G/NR) Number of slots within 1 subframe : 2 only, but the concept of slot is not used often in LTE. To address these challenges, we propose a novel frame structure design that incorporates several key changes relative to current LTE systems: Flexible TTI duration: The current LTE system uses a fixed transmission time interval (TTI) of one subframe (1 ms). The Evolved Packet Core (EPC). 5 ms each). 5 ms each). 6 GHz). The LTE frame is formed of 10 subframes (SF) of duration 1 ms each and sub-divided into 14 OFDM symbols. Downlink ※ Reference - 3GPP TS 36. As illustrated below, there can be two major types suggested. Like 4G, the frame is 10ms long with 1ms subframes, but it is a lot more flexible but also more complex. Spectrum utilization efficiency of LTE and NR bands with and without cross-band DSS. Type 2 LTE Frame Structure. Slot duration=0. In 5G/NR, we don't have any predefined pattern. Frame Structure 2. In the LTE standard (E-UTRA Citation 2019), OFDM signals are specified by three parameters, namely, the number of subcarriers or the Fast Fourier. 211 5. The figure below shows the structure of the downlink physical channel and downlink physical signals. The slot is of 0. Please share this video with your friends. The 10 ms frame comprises two half frames, each 5 ms long. We first introduce the LTE signal structure. The IP packet is enveloped in the 4G-LTE layers: 4G-LTE Packet Structure. Each LTE frame has 10 sub-frames (1. Three different types of physical channels are defined for theRadio Frame Structure for LTE. 211). So LTE need to keep the rule set by 802. For the normal mode, the first symbol has a cyclic prefix of length TCP = 160 ⋅ Ts ≈ 5. The difference lies in the LTE frame structure in both the FDD and TDD versions of the LTE. There are two types of frame structures in LTE; type 1 used for FDD and type 2 for TDD, as shown in the diagrams above. Embodiments of the flexible frame structure include different parameters that are flexible, i. This video looks at OFDM waveforms, and the different subcarrier spacings supported in 5G NR. Now (as of Sep 2017) 3GPP official specification (38. As illustrated below, there can be two major types suggested. 3) is used for Frequency Division Duplex (FDD) mode; however, the type 2 structure (Fig. 1-1: Mapping between cell-identity group and the indices m0 and. 5G, the fifth generation of wireless technology, employs a new radio access. System Information. Each LTE frame has 10 sub-frames (1 ms each) while each sub. MCCH Info. How many Time-Slot are present in Sub-Frame? Q04. SAE’s main component is the Evolved Packet Core, also known as an EPC. Uplink physical channels carries layer 2 information but uplink physical signals are only used by the physical layer. LTE-V2X PHY-layer Structure 10 LTE frames divided into 1 subframes Channel divided into resource blocks (RBs) 180 kHz RB contains:. A typical LTE frame is 10 ms (milliseconds) long. 16e standards WiMAX MAC layer Frame Structure as per OFDM 802. I think if we note to general sub-carrier in distinct LTE Bandwidth we are able to identified the answer. When data is. Frame structure 2 is commonly used. 5 mm width of the frame structure has a similar in sertion loss to the Nanomaterials 2023 , 13 , 221 3 of 11 copper-based microstrip line; therefore , the frame structure. • In downlink (DL) and uplink (UL), NB-IoT supports 15 KHz subcarrier spacing (SCS) frame structure. TD-SCDMA frame structure is shown in figure 2, which depicts frame hierarchy. 25KHZ, whereas UL Subcarrier=15KHz. Number of. Figure 10: Frame structure in LTE. design, LTE frame structure dedicated some channels for data and they are called data channels while others for control information, known as control channels. In the time domain the LTE transmissions are organized into frames of 10 msec length. The following text shows the frame structure of each type. Download scientific diagram | LTE frame structure in FDD mode: 7 OFDM symbols with normal CP [7]. In LTE TDD, we defined 7 predefined pattern for UL and DL allocation in a radio frame. Frame Structure Downlink Uplink Reference Signal. Each GSM superframe composed of multiframes (either 26 or 51 as described below). The duration of one LTE radio frame is 10 ms. 6 8. Read more >> Femtocell tutorial- This tutorial covers femtocell basics including network architecture.