Figure 3 shows the frame structure for LTE in FDD mode (Frame Structure Type 1). 4 shows an exemplary frame structure 400 for TDD in LTE. PCFICH and PDCCH. The duration of each subframe is 1 ms. In addition, the ME7873L can be tailored to the required test environment, matching customers' RF TRX, performance, and RRM requirements, as well as minimizing their. At least one of said second number of subframes is made to comprise at least three parts, as follows:. LTE is designed primarily for full duplex operation in paired spectrum. N TA,offset for a TDD uplink transmission is. 1 we illustrate the time/frequency frame structure of NR V2X and the definition of sidelink resource pools for TDD systems. e. 2 μs. 1. 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. The slot is of 0. The invention discloses a method (500) for a cellular communications system (100), in which traffic is sent in frames (200), each frame comprising a first number of subframes (201-210), with a second number of said subframes being available for at least either uplink or downlink traffic. Fig. This gap allows Base Station (BS) to switch from receive mode to transmit mode. The scheduling based on the SIB (System Information Blocks) transmission. The LTE TDD carrier, as illustrated, has a frame 402 that is 10 ms in length. OFDM symbol duration reduces with increased SCS -> since the number of. Configuration of special subframe Figure 24. balance between resolution of channel quality estimation and. 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. LTE’s main advantages come from the following features:The manner of transmitting SRS in LTE TDD is mainly the same as that in LTE FDD. 25 MHz to 20 MHz. 2 TDD Configurations The goal of the CBRS Alliance is to allow flexible use of CBRS band if coexistence of multiple deployments is preserved. Figure 1: TD D frame str ucture . We will go through Mobile WiMAX OFDMA physical layer which. 5G NR TDD self-contained slot structure in action Three examples showcasing faster TDD switching for low latency DL reference signals (DL DMRS) & UL Reference + Sounding (UL DSMR, SRS) not showed for simplicity. , the latency, and impact the capacity. 89 Figure 6. FIG. β TDD can be easily computed from Equation 6 for the allowed LTE TDD frame configurations. 2009-1-27 2 Outline • LTE requirement. A TDD includes a special subframe that has two pilot timeslots such as uplink and downlink that are separated from a GP (Guard. 2 TDD PDSCH Single Antenna Port Performance with 1 PRB. , RRM, admission and connection control, and. part 1 Figure 25. Hi All,There are lot of new member joined so i am providing the links of ORAN videos whi. LTE frame structures used for TDD 36. LTE video tutorials covering OFDM, frame structure, Cell mapping, random access procedure. Type 2 LTE Frame Structure. However, with static LTE-TDD, it is difficult to fulfill fast traffic adaptation, leading to the underutilization of base station resources. 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. Hi All,There are lot of new member joined so i am providing the links of ORAN videos whi. Slot configuration via RRC consists of two parts. LTE physical layer tutorials. • A radio frame has duration of 10 ms. . The frame structure for the type 2 frames used on LTE TDD is somewhat different. • Time domain structure (FDD) One frame, T frame =10ms One subframe, T subframe =1ms One slot, T msfeature is the frame structure, which introduces a special subframe. In 5G/NR, we don't have any predefined pattern. N/A. When selecting one of the LTE Frame ConfigurationThere are total 10 subframes in a frame. A method for performing communication using a time division duplex (TDD) frame by a user equipment (UE) in a wireless communication system, the method comprising: receiving a synchronization signal (SS) in one symbol of a first subframe of the TDD frame; and transmitting uplink control information through an uplink control zone. Frame: N+1) in the wimax frame structure. A nframe spans N Frame = 2, 4, or 8 radio frames. A diagram of the radio frame structure is shown in Figure 9, which includes information at the frame level down to the OFDM symbol level. In this paper, we study the frame structure design for low latency communications in 5G TDD systems. Moreover, each subframe is further divided into two equally sized time slots, that is, each slot is 0. Frame structures of these two working mode are presented in Fig. Further enhancements followed in Rel. Special Sub-Frames and their configuration determine the switching, i. 211 4 Frame structure). Thus, by properly configuring the timeslots, interference between TD-SCDMA and LTE TDD can be. It consists of a 10 ms radio frame divided into 20 slots, numbered 0 to 19, each with a duration of 0. Two duplexing methods are den ed in LTE, namely Time Division Duplex (TDD) and Frequency Division Duplex (FDD). In addition, the ME7873L can be tailored to the required test environment, matching customers' RF TRX, performance, and RRM requirements, as well as. There are seven possible configurations for LTE TDD frame as shown below. Timing and Synchronization – Essential for 5G-NR TDD network successof the TDD configuration structure. 5G frame structures provide a fixed overall structure for defining data block transmission timing. You might have experience how much complicated (confusing) it become about HARQ process in LTE in TDD mode. Spectral efficiency at 3. 03255) us. Technical Overview of 3GPP LTE | Hyung G. To introduce subslots into the TDD structure without impacting the overall subframe structure would mean limited gain, and to change the overall frame. We have investigated the suitable IO before designing the radar system. Then, 5G-NR is recommended to operate with a TDD DL/UL switching period of 5 ms with the pattern of “DDDDDDDSUU” and the DL/UL ratio of 8:2 to attain synchronization with LTE. tdd UL/DL Common Configuration (tdd-UL-DL-configurationCommon) in Detail . It is a TDD type of frame structure which is a natural choice since ETSI band 54 and FCC band 902–928 MHz are both unpaired bands. • The figure-3 depicts UMTS TDD frame structure. 00 - View presentation slides online. It enables very low latency, fast HARQ acknowledgments, dynamic TDD, coexistence with LTE and transmissions of variable length (for example, short duration for URLLC and long duration for enhanced MBB (eMBB)). 1. Figure 1 show s the frame structure fo r LTE TDD . The n78 band’s popularity is due to its relatively common availability, compared to lower cellular spectrum (below 2700MHz) already widely in use by 3G and 4G networks. FDD LTE is ideal for symmetric traffic, while TDD LTE is ideal for asymmetric traffic. In LTE base station is referred as eNodeB and mobile subscriber is referred as UE. frame structure optimization indicated higher. g. 211 V1. Frame structure in LTE-TDD systems. , 3:1 DL/UL ratio with 5 ms DL/UL switching period. 5ms each). In addition to the TDD frame structure, other channels require extra resources in-band with the TDD resources assigned for data channels. 5G NR frame Structure. LTE also support both TDD and FDD, but unlike the single frame structure used in NR, LTE uses two different frame structures. Frame structure Type 3N builds on the 3GPP frame structure with the addition of the new nframe concept. We propose a frame structure design method that implements a shorter transmission time interval. NB-IoT-U introduces frame structure Type 3N. Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) Both paired and unpaired. There are two topologies used in LTE system viz. . Under the existing LTE TDD frame structure , which subframe can be UL or DL is fixed within a radio frame . In LTE, only 2 slots are available. 1 shows the supported DL:UL data rate of the 63 LTE TDD. lets take few example to understand frame structure in more details . The useful symbol time is Tu = 2048 ⋅ Ts ≈ 66. NR frame structure supports TDD and FDD transmissions and operation in both licensed and unlicensed spectrum. 1. 11 and Rel. 5G TDD. A subframe comprises two slots, thus one radio frame has 10 sub‐frames. 12 to enable features such as aggregation of carriers between time-division duplex (TDD) and frequency-division duplex (FDD) frame structures. Slot configuration via RRC consists of two parts. 1), where the downlink and uplink transmissions are per-formed in different carrier frequencies. 3GPP LTE Frame Structure 2, Applicable to TDD. LTE carrier aggregation basics. Further each radio frame is divided into two sub frames each of 5ms. 1. As shown in Fig. This article describes OFDMA basics, OFDMA frame structure,OFDMA symbol, OFDMA Physical layer as per IEEE 802. Let us explain how it works, and which factors need to be considered. In case of co-site deployment, slot- and frame structures may be aligned to simplify cell search and inter. 1Present Scenario 4. TDD LTE is much better in the allocation of traffic than FDD LTE. ). 72 (=0. , OFDMA frame structure, PUSC permutation scheme in downlink and uplink subframes, ranging, and channel coding with tail-biting. These parameters are defined in 38. These parameters are defined in 38. Frame structure type 1 Figure 21. 7K views 2 years ago. B. Technical Overview of 3GPP LTE| Hyung G. simplified LTE TDD frame structure and sug-gested keeping only one optimized frame struc-ture for LTE TDD mode. 9 – Frame structure LTE-TDD type 2 (for 5€ms switch-point periodicity) Figure€E. 1 Downlink physical layer The LTE downlink PHY is specified for bandwidths from 1. In TDD, the transmission is divided into time domain, means at one moment of time either downlink. , 3:1 DL/UL ratio with 5 ms DL/UL switching period. LTE TDD frame structure is shown below. 2 LTE-based passive radar and signal processing procedures 2. 4 shows a frame structure 400 for a Time Division Duplex Long Term Evolution (LTE TDD) carrier. Two duplex schemes FDD and TDD are supported. 5 ms. 4. Download scientific diagram | LTE frame structure in FDD mode: 7 OFDM symbols with normal CP [7]. if we chose subframe configuration 7(Frame structure type 1), T_SFC become 5 and Delta_SFC become {0,1}. Finally, each subframe is split into two timeslots, each with a duration of 0. 3. LTE TDD frame 36. In order to achieve these goals, further enhancements to LTE and LTE-Aare considered in addition to development of the new radio technology for 5G NR networks. LTE Parameters and Downlink Modulation. In this paper, we analyze the performance of SC-FDMA and OFDMA in LTE Frame Structure based on Peak to Average Power Ratio (PAPR) analysis. 위의 그림이 FDD에 활용되는 Type1의 Frame 구조다. Root ZC sequence order for format 0-3. The invention discloses a method for a cellular communications system, in which traffic is sent in frames, each frame comprising a first number of subframes, with a second number of said subframes being available for at least either uplink or downlink traffic. subframe is transmitted or uplink. 3 TDD LTE Growth in the market 3. China adopted frame configuration DDDSUDDSUU (5ms) to support long PRACH formats and South Korea adopted. Signal Model Time Division Duplex (TDD) accomplishes this using different time slots for uplink and downlink signals over the same frequency. Myung 16 3GPP LTE. 10 mili second radio frame consists of Downlink subframe, Uplink subframe and Special subframe. UMTS TDD. efficiency and coverage because of the frame structure, and the nature of the spectrum unutilized for TDD being deployed in high bands. 1, TDD frames of different cells are aligned in the time domain. In the TDD duplexing mode, a single bandwidth is shared between uplink and downlink, with the sharing being performed by. FDD frame structure type is used. 1. Even under dynamic TDD configuration , the TDD configuration can only change every 10 ms ( one radio frame ) . Two duplex schemes FDD and TDD are supported. The The LTE frame structure for the FDD and TDD schemes was discussed in Chapter 9. · Each Radio frame consists two half frames. 211 frame structure type 2 (DL / UL / SSF) Filter. Based on GP in the special sub-frame of TDD LTE-A system, a novel positing scheme is proposed in this paper by adding navigation signal. This new frame structure is designed to make LTE signal similar to WLAN burst. This is shown in figure after uplink subframe(of frame: N) and before next downlink subframe (i. Signal Studio for LTE/LTE-Advanced FDD currently supports only FDD and frame structure type 1. 8. 3. The LTE PHY is typically full duplex. Common frame structure eliminates the need of guard band between operators. 3. Numerology – Subcarrier Spacing. It improves on those standards' capacity and speed by using a different radio interface and core network improvements. Type 1 LTE Frame Structure. Each. 1. DL Control Channel. The LTE Application framework supports the following (partially fixed) configurations: Bandwidth mode: 20 MHz (100 PRBs) Cyclic prefix configuration: Normal cyclic prefix; Frame Structure: Type 1—FDD; Type 2—TDD. 5 ms repetition period. LTE supports a number of uplink-downlink configurations for TDD. OFDM with a cyclic prefix is the basic modulation scheme selected to combat severe frequency-selective multipath fading. WO2015123203A1 - Method and apparatus for determining a flexible subframe type in a lte-tdd system - Google PatentsLTE Frame Structure based on Peak to Average Power Ratio (PAPR) analysis. In TD-SCDMA a super-frame of 720 ms duration is made of 72 radio frames of 10 ms duration each. The WiMAX frame adopts a subframe ratio structure of 29:18, the LTE TDD frame adopts a subframe ratio structure of subframe configuration 1, and an UpPTS time slot and a last uplink symbol of a last uplink subframe which are in the LTE TDD frame. One way to avoid cross-link interference is to ensure that all base stations are either transmitting simultaneously or receiving simultaneously. Channel Mapping and UE Categories. 12 – Example of VBW setting for LTE-FDDand LTE-TDD to avoid underestimation. Carrier aggregation is supported by both formats of LTE, namely the FDD and TDD variants. Frame Structure LTE has a 10-millisecond-long frame with 20 time slots of 0. 7 μs. All networks operating within the 3. However, unlike LTE-U, LAA use a special physical layer frame structure called Frame Structure Type 3 which didn't exisit before. The basic type 1. The Spc SF is placed between. 5 GHz range use a common 5G NR frame structure. Each frame is divided into ten equally sized subframes. • In UMTS TDD, both uplink and downlink shares same frequency band at the same time period. Therefore, the accuracy. Can schedule 1 DL and multiple UL sub-frame at a time. 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 1 ms duration. You’ll also learn about the impact of different subcarrier spacings on slots and subframes. LTE can support TDD operation in unpaired spectrum; however, it is not a primary focus of the design. Switching Points. . A. LTE network offers about. • A resource block (RB) spans 12 subcarriers over a slot duration of 0. During this time period equivalent to RTG gap, both BS and SS do not transmit any data. For the normal mode, the first symbol has a cyclic prefix of length TCP = 160 ⋅ Ts ≈ 5. in Figure 1. < LTE FDD Uplink Frame Structure >. At least one of said second number of subframes is made to comprise at least. Initial Cell Search and Cell Selection. In 5G/NR, we don't have any predefined pattern. The radio frame is represented in the LTE Toolbox™ product by the use of a succession of 10 cell-wide settings structures with the NSubframe field set from 0 through 9 in each case. Here D-is downlink, S-for Sp e-cial sub frame and U - for Uplink. However the system structure of LTE TDD is different from of that in LTE FDD. 4. same time at different frequencies. “10ms” version, and gives greater opportunity for uplink/downlink flexibility. 2 LTE Frame Structure The frame structure is dependent on the duplex scheme applied in the spectrum. 7. This paper discusses the details of UDC. 5. URLLC within a carrier should be supported , and TDD with flexible UL / DL ratio is desirable . Let me illustrate New Radio frame structures with multiple SCS below. Figure 3 shows the frame structure for LTE in FDD mode (Frame Structure Type 1). Frame Stracture. For multiple access, LTE uses: For down link: OFDMA: Orthogonal Frequency Division Multiple Access. As an. Furthermore, different frame structures, especially for TDD configurations, are not discussed even though NB-IoT is required to support TDD. The actual LTE (4G) is based on 3GPP Release 11. The frame structure consists of a 10 ms frame, subdivided into two 5 ms subframes, each one having seven traffic timeslots for uplink and downlink. There are seven possible configurations for LTE TDD frame as shown below. CMCC, CATT, etc. • The equipment requires to be switched between transmission and reception. As seen in the figure, in each frame some subframes are allocated for uplink transmissions and some subframes are allocated for downlink transmission,. Choose a configuration with more “D”s in the frame means greater proportion of Downlink Data (normal for most Internet /ISP applications) Frame Structure. 2. As shown in the figure below, an LTE TDD frame is made of total 20 slots, each of 0. In FDD, where frame structure 1 is used, N TA,offset =0. This is known as synchronization and refers to sharing a common clock, phase reference and the same frame structure. This section describes the design and implementation of an OFDMA-TDD PHY compliant with the mobileWiMAX standard. Choose. One of these feature is Uplink Data Compression, UDC. LTE Frame Structure. 5 ms 1 radio frame = 10 subframes = 20 slots. HI all,Please go through video of LTE Frame Structure (FDD and TDD). 2. The current version of the document focuses on Band 48 [11] LTE-TDD using Frame Structure 2 (FS2) The NR frame structure supports TDD and FDD transmissions and operation in both the licensed and the unlicensed spectrum. A nframe spans N Frame = 2, 4, or 8 radio frames. In other embodiments, the first and second radio frames are two different ones that fall within the same downlink/uplink configuration period. The LTE FDD uses a Type-1 frame structure whereas the LTE TDD uses a Type-2 frame structure. frequency band (Band n78) to define common TDD frame structures at national level. Other limitations, such as pseudo-congestion and lack. In the case of TDD operation (frame structure type 2, middle part of Figure 5. Each frame is then divided into ten subframes of 1-millisecond duration. 2와 같이 프레임 구조 (Frame Structure)가 다르다. Instead of following a fixed TDD frame structure over time like LTE, 5G NR can rely on both semistatic configuration and dynamic indication to claim which slots and symbols are used for uplink and which slots and symbols are used for downlink. Frame Structure Type 1. MHz spectrum, we have to use this 20 MHz bandwidth for both DL and UL. 7 GHz band. Frame Structure. Example with 2 subchannels of 10 RBs each, using TDD pattern of [D D D F U U U U U U] and sidelink bitmap of. 5G opens up new spectrum by the introduction of Sub-6GHz and mmWave, which can also be deployed as non-standalone with LTE, thus, creating new challenges for carriers to deliver a ubiquitous user experience,LTE, LTE Advanced, Gigabit LTE 2020s Wireless Edge 5G New Radio (NR) 3 Delivering on the 5G vision. 2. 7 to 12. TDD have a special sub frame (1,6) when downlink-to. Further enhancements followed in Rel. 그 위 L2부터는 동일한 규격을 사용한다. At least one of said second number of subframes is made to comprise at least three parts, as follows:. FDD sTTI: New features in Rel. The uplink enhancement technology used by NR TDD and NR FDD can significantly increase the uplink data rate. 10 such subframes form one radio frame. 2 μs. LTE의 Frame 구조는 FDD와 TDD로 나누어 규격에 정리되어 있다. LTE uses either Frequency Division Duplex (FDD) or Time Division Duplex (TDD). The method comprises the following steps: the downlink reference signals are transmitted by a base station in a downlink subframe in a TDD system with a category 2 frame structure and the downlink reference signals are transmitted by. This page is moved soon to Guard Period in TDD Bands makes them highly inefficient if used in lower frequency configurationThe LTE TDD frame structure is Type 2. Frame structure type 2 is applicable to TDD. k) that the frame structures given in Annex 1, Frame A and Frame B can be implemented for NR(New Radio) systems; l) that the Frame B2 given in Annex 1 is compatible with the LTE-TDD frame structure configuration n o. the cells must use the same TDD configuration; the deviation in frame start timing between cells must be below a maximum value specified as cell phase synchronization accuracy in the 3GPP. Determining a frame structure of the first RAT comprising a subframe rate, and switching periodicity, at least in part to a corresponding. It consists of a 10 ms radio frame divided into 20 slots, numbered 0 to 19, each with a duration of 0. 211 frame structure type 2 (DL / UL / SSF) Filter. 5 times higher compared to a classic LTE 4×4 configuration. 8 PDSCH REs in1 radio frame and 1 Tx antenna, TDD mode 0. 5 ms. An operator can choose a specific TDD configuration depending on the service requirements; Frame always starts with a Downlink subframe, used for advertising the frame descriptor information i. An operator can choose a specific TDD configuration depending on the service requirements; Frame always starts with a Downlink subframe, used for advertising the frame descriptor information i. Frame Structure • Two radio frame structures defined. 참고로 규격은 3GPP의 TS36. Additionally, NR supports transmission based on mini-slot (a fraction of a slot) as a minimum scheduling unit. 10 ms radio frame, 1 ms sub frame. 3GPP defined seven frame structures for LTE-TDD, where only a limited number of configurations allocate more transmission time to the DL than the UL and have a 5 ms periodicity, which is necessary for compatibility with NR for quicker response. Difference is that in LTE TDD, a half-frame of length 5 ms has both uplink sub-frame and downlink sub-frame, a number of uplink sub-frames and downlink sub-frames is configured by the. Part 1, LTE Basics 9:30 – 10:30 Introduction to LTE FDD/TDD frame structures and reference signals Physical channels, logical channels PHY signal processing architecture H-ARQ processing, H-ARQ timing UE categories. (Preamble format 4 is used only in TDD LTE. 3GPP defines two types of frames based. Learn the basics behind 5G NR waveforms, frame structure, and numerology. TDD frame structure can thus be configured into 7 different formats of 1ms-subframes. 5 GHz 5G band, or C-band 5G, is the most commonly tested and deployed 5G frequency. As a result, the achievable capacity gain from M-MIMO antennas is approximately 2. Operating Bandwidths for LTE Devices 3. This video then walks you through the concept of carriers and. In LTE base station is referred as eNodeB and mobile subscriber is referred as UE. 4. Two types of CP – Normal Cyclic Prefix Extended Cyclic Prefix. So, it is very important to understand the slot structure and other details about slot-based scheduling etc. A. FDD and TDD LTE networks have been deployed on all continents. In frame structure Type 1, each 10 ms radio frame is divided into 10 equally sized subframes. Single Ack/Nack corresponding to 1DLsub frame LTE DL Frame Structure in a Nutshell. It improves on those standards' capacity and speed by using a different radio interface and core network improvements. The LTE-TDD frame structure can be adjusted to have either 5ms or 10ms DL-UL switch point periodically. However, for this to work all TDD networks, either LTE or 5G, operating in the same frequency range and within the. The 5G NR frame structure is defined by the 3GPP and here we present details of the NR Frame Structure that is specified in 3GPP specification (38. As shown 5 ms periodicity frame have two “S” sub frame and 10 ms framesIn LTE TDD, we defined 7 predefined pattern for UL and DL allocation in a radio frame. 3rd frame is always used for Uplink transmissionLTE TDD Frame Structure ? FDD|| TDD क्या है I अगर प्रोटोकॉल टेस्टिंग की है तैयारी तो जरूर देखो. 11 – LTE-TDD PBCH measurement example. With this shift, the sequence of subframes in the LTE frame becomes D, D, S, U, U, which is the same structure of the Cambium PMP frame (downlink, turnaround time, uplink). The TD frame consists of Downlink subframe, Uplink and Special subframe. Downlink Uplink Frame. The target of TDD. Type 1 radio frame has a duration 10 ms and consists of equally sized 20 slots each of 0. Type 2: TDD : Time Division Duplex. A flexible radio frame structure for both FDD and TDD is proposed. The subcarrier spacing is f=15kHz LTE supports two radio frame structures Type 1, applicable to frequency division duplex FDD Type 2, applicable to time division duplex TDD 1 radio frame = 10ms 1 subframe= 1ms 1 slot = 0. LTE TDD Frame Structure & Traffic Adaptation (R12) Optimum TDD UL/DL Configuration Index Distributed Optimization of TDD UL/DL Configuration Simulation Results Conclusion . For LTE TDD, the frame configuration 2 is the most widely used frame structure, i. LTE Physical Layer 2 radio frames are supported: 1. But in NR, the number of slots varies according to the numerology. 1 and 10. Double-click or use the drop-down menu to set the system bandwidth and number of Resource Blocks (RB). Application. 1 shows an example of such TDD configuration structure in LTE with T= 10 [2]. Frame Structure Type1. The frame structure is divided into three types: FDD, TDD, FDD and TDD. 3. With this shift, the sequence of subframes in the LTE frame becomes D, D, S, U, U, which is the same structure of the Cambium PMP frame (downlink, turnaround time, uplink). 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. 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. 3. 5ms, each slot is composed of 7 symbols (normal cyclic prefix), therefore a resource block of 12 subcarriers by 7 symbols occupies one slot. Refer LTE Frame >>. The radio frame is represented in the LTE Toolbox™ product by the use of a succession of 10 cell-wide settings structures with the NSubframe field set from 0 through 9 in each. from publication: Robust Doubly-Differential Primary Synchronization Approach for 3GPP LTE Systems. Frame structure type 1 is applicable to both full duplex and half duplex FDD. In an FDD scheme, all ten subframes within a radio frame contain either downlink or uplink subframes depending on the link. LTE TDD is designed to co-exist with 3GPP TD-SCDMA, and as a result, uses the same frequency bands and frame structure. US20170055256A1 - Method and apparatus for determining a flexible subframe type in a lte-tdd system - Google PatentsFigure€E. Two types of frames are defined for LTE: Type 1, which is used in FDD and is the dominant mode of operation as shown in Fig. A radio frame (10 ms) consists of 10 subframes (1 ms). The remaining six symbols have a cyclic prefix of length TCP = 144 ⋅ Ts ≈ 4. One of the most fundamental TDD features is the specific TDD frame structure with the introduction of the special subframe. The ME7873L LTE RF Conformance Test System supports the LTE frequency bands deployed worldwide, and users can choose the FDD/TDD test functions matching their test terminals. Type 1 lasts 10 ms equivalent to 10 subframes. Radio frames and subframes are of fixed lengths. This avoids inter-network interference. TDD frame structure type is used. LTE Frame Structure Figure 1 describes the LTE frame structure for TDD mode [4].