The purpose of different frame structures: flexible, multiple uses. To set up a fixed reference channel (FRC), for an Advanced LTE TDD Uplink carrier, click the Wizard button Uplink Setup node to open the PRACH Wizard. TDD Mode UL/DL Configuration Frame Structure for L TE-Advanced In the figures giving the analysis, the case numbers (Case #1, #2, and so on) refer to the occurrence of RACH triggerDemodulating an LTE Signal in MATLAB with LTE System Toolbox. To configure the downlink signal in this slot pattern, two separate DL-SCHs will be needed to represent two different channel. A radio frame (10 ms) consists of 10 subframes (1 ms). The uplink edge rate increases from 0. Configuring a Downlink Signal Under TDD Frame Structure. In LTE, only 2 slots are available. Note the similarities to the LTE standard for the 20 MHz transmission mode . In LTE, a subframe is used as a minimum scheduling unit in time-domain while in NR, a slot is used as a dynamic scheduling unit. Probably what I do as the first step is to describe each part of the map in a verbal form Overview-TDD : Frame Structure Type 2 < TDD LTE Frame Structure > 5/26 4/19/22, 2:11 PM ShareTechnote Followings are. The manner of transmitting SRS in LTE TDD is mainly the same as that in LTE FDD. (TDD) frame structure. NOTE: There are much more information you need to know about the numerology in addition to this table. We will go through Mobile WiMAX OFDMA physical layer which. These parameters are defined in 38. Each subframe composed of 2 time slots. 4. Figure 1 shows frame structure type 1, which can be used in either full-duplex or half-duplex FDD mode. TD-LTE has a 10 ms TDD frame structure. 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. Number of OFDM symbols per slot, slots per frame, and slots per subframe for normal cyclic prefix. Downlink Uplink Frame. 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. , RRM, admission and connection control, and. LTE is mainly designed for high speed data applications both in the uplink and downlink. 1 provides an illustration of an LTE FDD and TDD frame structure as an example of an air interface with FDD and TDD modes. Each frame is divided into 10 subframes of 1 millisecond, and the subframe is further divided into slots according to numerology. . TDD-LTE and FDD-LTE 3. Numerology – Subcarrier Spacing. In TDD mode, the SF is either of type DL, UL or special (Spc). The Fading parameters are available for Advanced LTE and Advanced LTE-A TDD. An apparatus for a user equipment (UE) device, comprising baseband circuitry having a radio frequency (RF) interface configured to receive downlink (DL) signals and transmit uplink (UL) signals during a succession of long-term evolution (LTE)—time division duplex (TDD) radio frames, and one or more processors configured to: determine, based on a. But anyway good thing to me was that the most important factors in uplink slot is same as the one in the downlink. com This page covers LTE Frame structure including subframe and slot structure. LTE standard has been published by 3GPP as an extension of UMTS (based on 3GPP standard) and 1xEV-DO (base on 3GPP2 standard) technologies. This paper presents the LTE duplexing modes: LTE-TDD (Time Division Duplexing) and LTE-FDD (Frequency. Half frames are further divided into 4 subframes and one special subframe, based on the downlink-to-uplink switch point periodicity. Type 1: FDD Frame. e. 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. 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. 25 MHz to 20 MHz. Frame 0 and frame 5 (always downlink in TDD) Frame 1 and frame 6 is always used as for synchronization in TDD; Frame allocation for Uplink and Downlink is settable in TDD; The sampling rate in both LTE FDD and LTE TDD is the same and both technologies operate under a 1-ms sub. EP3416330A1 EP18185302. Downlink and uplink transmissions are organized in the form of radio frames with 10 ms duration (Fig. Here D-is downlink, S-for Sp e-cial sub frame and U - for Uplink. LTE uses either Frequency Division Duplex (FDD) or Time Division Duplex (TDD). 2 LTE-based passive radar and signal processing procedures 2. 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. 3. NR uses flexible subcarrier spacing derived from basic 15 KHz subcarrier spacing used in LTE. Two radio frame structures are supported; Type 1 and Type 2 are applicable to frequency division duplex (FDD) mode and TDD mode, respectively [2]. MHz spectrum, we have to use this 20 MHz bandwidth for both DL and UL. For LTE TDD, the frame configuration 2 is the most widely used frame structure, i. • In UMTS TDD, both uplink and downlink shares same frequency band at the same time period. The Spc SF is placed between. Here D-is downlink, S-for Sp e-cial sub frame and U - for Uplink. Unique Feature of 5G Subframe comparing to LTE : Multiple. Switching Points. 10 ms radio frame, 1 ms sub frame. 2 Differences between FDD-LTE and TDD-LTE 3. 2 DSUDDDSUDD (10ms duration), where different special subframe “S” configurations are possible such 1 The LTE frame is formed of 10 subframes (SF) of duration 1 ms each and sub-divided into 14 OFDM symbols. The target figures for data throughput in the downlink is 1 Gbps for 4G LTE Advanced. Determine frame synchronization and cell identification (cell search procedure) based. 2 Mbit/s to 1. Type 1 LTE Frame Structure. In TDD there are. At least one of said second number of subframes is made to comprise at least three parts, as follows:. 2. Mandatory Guard Period in TDD Bands makes them highly inefficient if used in lower frequency configurationThe LTE TDD frame structure is Type 2. See full list on rfmw. TDD frame structure type is used. This paper discusses the details of UDC. This video looks at OFDM waveforms, and the different subcarrier spacings supported in 5G NR. 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. The LTE TDD frame is transmitted after the starting time of the LTE TDD frame arrives. 9 PDSCH REs in1 radio frame and 2 Tx antennas, TDD mode 0. LTE의 Frame 구조는 FDD와 TDD로 나누어 규격에 정리되어 있다. Less. 5 GHz. 4G/LTE - MBSFN. 10 – Frame structure of transmission signal for LTE-TDD. 5 ms each in the time domain. In case of co-site deployment, slot- and frame structures may be aligned to simplify cell search and inter. 2(a) illustrate the two types, respectively. DL Control Channel. 12 to enable features such as aggregation of carriers between time-division duplex (TDD) and frequency-division duplex (FDD) frame structures. 4 frames are available only if the Radio Allocation Period is 4, 8, 16, or 32. Whereas further optimizations can be made for Frequency Division Duplexing (FDD) systems, the combination of sTTI and Time Division Duplexing (TDD) has limits. 7 GHz band. • A resource block (RB) spans 12 subcarriers over a slot duration of 0. Duplex method - The NR frame structure supports Time Division Duplex (TDD. The slot is of 0. Marriage of single carrier transmission and FDMA;NB-IoT-U introduces frame structure Type 3N. It is. At the initial phase of LTE develoyment, you haven't doubt on that every LTE subframe would carries CRS(Cell Sepecific Reference Signal) in it. lets take few example to understand frame structure in more details . . There are two types of LTE frame structures. channel coding. • A radio frame has duration of 10 ms. Key to many 5G features is the fact that the subcarrier spacing in 5G NR can take not just one value, 15 kilohertz in LTE, but powers of 2 multiples of 15 kilohertz up to 240 kilohertz as shown on the first line. 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. Two duplexing methods are den ed in LTE, namely Time Division Duplex (TDD) and Frequency Division Duplex (FDD). In TD-SCDMA a super-frame of 720 ms duration is made of 72 radio frames of 10 ms duration each. Frame structure with Numerologies. Downlink Uplink Frame. 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. OFDM with a cyclic prefix is the basic modulation scheme selected to combat severe frequency-selective multipath fading. HI all,Please go through video of LTE Frame Structure (FDD and TDD). ECC Recommendation (20)03. A method for use in a cellular communications system, in which system the 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, according to which method at least one of said second number of subframes is made to. One slot made up of 7 small blocks called 'symbol'. Fig. For TDD, a subframe is either allocated to downlink or uplink transmission. There are two topologies used in LTE system viz. LTE, TDD frame structure uses. There are seven possible configurations for LTE TDD frame as shown below. LTE Downlink Channel Estimation and Equalization. Fig. – Frame structure type 2 (FS2): TDD. Yes it brought multiple options in sub-carrier spacing, which is called as Numerologies; 15 through 240 kHz. The remaining six symbols have a cyclic prefix of length TCP = 144 ⋅ Ts ≈ 4. LTE Introduction. Choose a configuration with more “D”s in the frame means greater proportion of Downlink Data (normal for most Internet /ISP applications) OneAdvisor Realtime Spectrum – LTE-FDD LTE-TDD Frame Structure LTE-TDD Structure LTE-TDD transmission is done in 10ms frames containing 10 sub-frames of 1ms and 20 slots of 0. In the special slot, symbols allocated for downlink, gap and uplink are 10:2:2 respectively. Flexible Bandwidth: 1. This gap allows Base Station (BS) to switch from receive mode to transmit mode. 4MHz to 20MHz. 10 ms radio frame, 1 ms sub 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 case. DL Control Channel. FDD sTTI: New features in Rel. tdd UL/DL Common Configuration (tdd-UL-DL-configurationCommon) in Detail . OFDMA Downlink. Common frame structure eliminates the need of guard band between operators. 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. The NG-RAN includes new generation LTE eNodeB (ng-eNB) and 5G NodeB (gNB), which are responsible for the radio functions, e. 3 TDD LTE Growth in the market 3. For example, the public network has more downlinks, and the private network or private network has more uplinks. Fig. PCFICH and PDCCH. For the normal mode, the first symbol has a cyclic prefix of length TCP = 160 ⋅ Ts ≈ 5. The LTE architecture consists of LTE EUTRAN and LTE Evolved Packet Core (EPC). 8. 5G frame structures provide a fixed overall structure for defining data block transmission timing. One subcarrier has bandwidth of 15 kHz. Check out the Episode 13 of Field Journal to get answers to questions like:Time division duplex (TDD) plays an important role in 5G systems because it employs an unpaired spectrum and offers channel reciprocity. Physical, MAC, RLC, PDCP and RRC as shown in the figure. 1 Reasonable illuminator. It improves on those standards' capacity and speed by using a different radio interface and core network improvements. I think this kind of subframe structure would clear up a lot of confusion. 4 shows a frame structure 400 for a Time Division Duplex Long Term Evolution (LTE TDD) carrier. 가장 큰 차이점은 프레임 구조와 HARQ이다. 즉, 1개의 Radio Frame은 10개의 Subframe!! 여기서 1ms의 Subframe 길이가 TTI (Transmission. Learn the basics behind 5G NR waveforms, frame structure, and numerology. LTE also support both TDD and FDD, but unlike the single frame structure used in NR, LTE uses two different frame structures. Finally, each subframe is split into two timeslots, each with a duration of 0. Under the flexible frame structure, each radio frame consists of a plurality of slots, and each slot within a radio frame has a flexible slot type. N/A. Accordingly, LTE supports two kinds of frame structures: frame structure type 1 for the FDD mode and frame structure type 2 for the TDD mode. 211 V15. UMTS TDD. Type 1: FDD Frame Structure. Conformance Test Setup. Other limitations, such as pseudo-congestion and lack. . in NR slot. KR20160137999A - Method and apparatus for determining a flexible subframe type in a lte-tdd system -. 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. It includes support for mobile broadband data, mission-critical communication, and massive machine communication. 1; and Type 2, which is used in TDD and is the minor mode [24]. 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)). cyclic prefix). In TDD (Time division duplex) technique we are using, same frequency or frame for both DL and UL but at a different time. e. 25 MHz to 20 MHz. Downlink Uplink Frame TIME. For the normal mode, the first symbol has a cyclic prefix of length TCP = 160 ⋅ Ts ≈ 5. • The figure-3 depicts UMTS TDD frame structure. There are two types of LTE frame structure: 1. Type 2: TDD : Time Division Duplex. Frame Structure Type 2. Uplink-downlink configurations Figure 23. Earlier versions of the specifications also supported 1. 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. Spectral efficiency at 3. In LTE TDD, we defined 7 predefined pattern for UL and DL allocation in a radio frame. PMP frame to this LTE frame, the downlink start has to align to the beginning of subframe 4, not subframe 0. Radio frames and subframes are of fixed lengths. LTE,SRS, Sounding Reference Signal Tweet4Technology: LTE 5G-NR Wireless Technology Blogs. In this tutorial, TDD frame structure below will be used, which is a DDDSU slot pattern with 2. UE hence learns the frame structure in the subframe. The HI all,Please go through video of LTE Frame Structure (FDD and TDD). In this example we will be simulating what happens when a mobile phone is turned on. Figure 1: LTE Generic Frame Structure [3] 2. Now the question comes, who decides the sequence of these subframes. Additional information on other system parameters is also listed in Table 2. Therefore, the accuracy. There are three types of Frame Structure : Type 1 for FDD, Type 2 for TDD, Type 3 for LAA. 2. LTE TDD frame structure type 2. OFDM symbol duration reduces with increased SCS -> since the number of. channel coding. Some parameters do not apply to the Basic LTE PRACH and Basic LTE-A PRACH. 5 ms, T FA is the radio frame alignment which depends on various configurations of the TDD frame structure, and the TTI duration is 1 ms, hence, the user-plane latency of the TDD mode can be written as T USER-PLANE = 3. Figure 1. Subcarrier (SC) spacing of 15kHz is used, leading to OFDM symbol length of 66. As a consequence, as the OFDM symbol duration is the. LTE TDD Frame Configuration These first three groups of settings apply to all basic carriers. A. · Radio frame size= 10 ms. LTE uses OFDMA for the downlink, with a fairly simple frame structure, and SC-FDMA for the uplink. Frame Structure Candidates . 5. 1 The NG-RAN. frame [9]. In 4G LTE networks, both FDD and TDD, the transmissions are sent in radio frames of 10 milliseconds. g. Now the focus will be also on the physical channels structure, their processing in both FDD and TDD mode of LTE. When operating in TDD mode, we have to clearly define on exactly when to expect the transmission and when to expect the reception. (for FDD and TDD) and DCI Formats 2B/2C for TDD alone. There is also basic information about how and why synchronisation can and should be achieved. LTE TDD Frame Configuration These first three groups of settings apply to all basic carriers. The The LTE frame structure for the FDD and TDD schemes was discussed in Chapter 9. balance between resolution of channel quality estimation and. , 3:1 DL/UL ratio with 5 ms DL/UL switching period. 16e mobile wimax standard. · Each Radio frame consists two half frames. especially for LTE-TDD networks. Further enhancements followed in Rel. In frame structure Type 1, each 10 ms radio frame is divided into 10 equally sized subframes. Two types of CP – Normal Cyclic Prefix Extended Cyclic Prefix. In a number of countries, there are legacy LTE TDD or WiMAX networks in the 3. 5 GHz range. 0 as follows : TDD-UL-DL-ConfigCommon ::= SEQUENCE 04/02/2023 10 Types of Frame Structure in LTE: • Types of Frame structure in LTE: 3GPP defines two types of frames based on the duplexing scheme used. The useful symbol time is Tu = 2048 ⋅ Ts ≈ 66. Frame Structure Type 2: TDD. In Frame Structure Understanding the 5G NR Physical Layer Waveform, Numerology and Frame Structure 21 – Frame: 10 ms – Subframe: Reference period of 1 ms – Slot (slot based scheduling) • 14 OFDM symbols • One possible scheduling unit - Slot aggregation allowed • Slot length scales with the subcarrier spacing Let us understand LTE FDD and TDD LTE versions with figures and band example below. Figure 1: LTE Generic Frame Structure [3] 2. Channel Mapping and UE Categories. The same signals. Slot configuration via RRC consists of two parts. Double-click or use the drop-down menu to set the subframe allocation for MBSFN within the radio frame allocation period defined by the two parameters: Radio Frame Allocation Period and Radio Frame Allocation Offset. balance between resolution of channel quality estimation and. 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. 5ms duration. 2. BRIEF DESCRIPTION OF THE DRAWINGS Various embodiments of the invention are disclosed in the following detailed description and the accompanying draw 1ngS. 0 (2007-06): Physical Channels and Modulation. LTE is designed primarily for full duplex operation in paired spectrum. Frame Stracture. • The figure-3 depicts UMTS TDD frame structure. In TD-SCDMA a super-frame of 720 ms duration is made of 72 radio frames of 10 ms duration each. 7 μs. The. simplified LTE TDD frame structure and sug-gested keeping only one optimized frame struc-ture for LTE TDD mode. part 1 Figure 25. 11 – LTE-TDD PBCH measurement example. 331 v15. The current version of the document focuses on Band 48 [11] LTE-TDD using Frame Structure 2 (FS2) [4][16] and limited support for n48 [18][19] NR-TDD deployment. Uplink and downlink configurations are used to create subframes (0 to 6). TDD In TDD mode occupy the same frequency spectrum but are separated in time for uplink and downlink transmissions . Root ZC sequence order for format 0-3. 15. Refer LTE stack >>. 3. Two duplex schemes FDD and TDD are supported. Compared with the 3. Frame structure type 2 is applicable to TDD. This applies for the currently-transmitting Starlink satellites (versions 0. The frame consists of two "half-frames" of equal . A 5G frame structure designed for efficient support of users with highly diverse service requirements is proposed. Length of one slot is fixed. Figure 20. 5 GHz 5G band, or C-band 5G, is the most commonly tested and deployed 5G frequency. Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD) Both paired and unpaired. . know, one sample (Ts) is 1/30. UL Control Channel. Each radio frame will have a total of ten subframes, each with two time slots. One sub frame is composed of 7 normal time slots used for downlink/uplink and 3 special time slots. 7 μs. This ingenious method enables full-duplex (simultaneous) communication over a half-duplex (serial-binary) link. There are three types of Frame Structure : Type 1 for FDD, Type 2 for TDD, Type 3 for LAA. Therefore, the accuracy. 5G frame structures provide a fixed overall structure for defining data block transmission timing. 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. 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. Frame Structure Type 1. Subframes 0 and 5 contain synchronization signal and broadcast information necessary for a UE to perform synchronization and obtain relevant system information. These are Type 1 when FDD is used and Type 2 when TDD is used. Introduce LTE TDD – FDD Carrier Aggregation support (aggregation of carriers with different frame structures) including either TDD or FDD as PCell(*) satisfying the following conditions: UEs supporting FDD and TDD carrier aggregation operation shall be able to access both legacy FDD and legacy TDD single mode carriers;LAA . 3 GHz TDD technology in [15] and. [3] TDD LTE-A frame, presented in Figure 1a, has been built on top of the LTE frame structure type 2. The LTE PHY is typically full duplex. 0 LTE TDD Subframe Configuration Feature ISSUE 1. LTE TDD Frame Structure & Traffic Adaptation (R12) Optimum TDD UL/DL Configuration Index Distributed Optimization of TDD UL/DL Configuration Simulation Results Conclusion . The 10 ms frame comprises two half frames, each 5 ms long. 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. Frame structure type 1 is applicable to both full duplex and half duplex FDD. LTE PHY layer overview. Time Division Duplex Wireless is a fundamental technology for 5G deployments around the world. 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. 1 Definition of TDD and FDD 3. 1 Downlink physical layer The LTE downlink PHY is specified for bandwidths from 1. 5ms duration. LTE Frame Structure Two types of LTE frame structures are den ed depending on the duplexing mode of the transmission. Figure 1 shows frame structure type 1, which can be used in either full-duplex or half-duplex FDD mode. The 5G NR architecture comprises next-generation RAN (NG-RAN) and 5G Core Network (5GC) [], both described in the following subsections. The frame structure for the type 2 frames used on LTE TDD is somewhat different. (Credit: 3GPP TS 38. 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. 2 LTE TDD In case of TDD operation, there is only one single carrierFig. Type 2: used for the LTE TDD systems. Each subframe has two slots. 1. However, with static LTE-TDD, it is difficult to fulfill fast traffic adaptation, leading to the underutilization of base station resources. When operating in TDD mode, we have to clearly define on exactly when to expect the transmission and when to expect the reception. Each radio frame will have a total of ten subframes, each with two time slots. Frame-Structure in LTE. 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. The frame structure below ( Figure 1) is applicable to TDD. For TDD synchronicity and interference, the critical points are when switching between transmission and reception, as shown in Figure 2. LTE supports two radio frame. The frame structure is divided into three types: FDD, TDD, FDD and TDD. There are six time units: frame, half-frame, subframe, slot. Frame: N+1) in the wimax frame structure. The table shown below is outlining key parameters of the 5G network's physical layer frame structure for different numerologies (denoted by μ). There are three different kinds of units specified for this frame structure, illustrated in Figure 6. FDD version is used where both uplink and downlink data rates are symmetrical. FDD LTE is ideal for symmetric traffic, while TDD LTE is ideal for asymmetric traffic. 9G (Pre-4G) cellular technology Now sold as 4G. 2 μs. You might have experience how much complicated (confusing) it become about HARQ process in LTE in TDD mode. e. 5 + T FA + p T RTT where T RTT is the. cyclic prefix). Myung 16 3GPP LTE. There are two types of LTE frame structure: Type 1: used for the LTE FDD mode systems. 2. The LTE-TDD frame structure can be adjusted to have either 5ms or 10ms DL-UL switch point periodically. “10ms” version, and gives greater opportunity for uplink/downlink flexibility. Type 1: used for the LTE FDD mode systems. When selecting one of the LTE Frame ConfigurationThere are total 10 subframes in a frame. It consists of a 10 ms radio frame divided into 20 slots, numbered 0 to 19, each with a duration of 0. in Figure 1. A method performed by a wireless device for determining a timing advance (TA) offset in a new radio (NR) network is described herein along with associated network devices and systems. 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. 2. 5 milliseconds. 11. given in Annex 1 is compatible with the LTE-TDD frame structure configuration no. TBS Index Advanced LTE TDD Carrier–DownlinkLTE-Advanced Physical Layer Overview. Frame structure in LTE-TDD systems. The default parameters for national TDD synchronization should be defined before awarding the spectrum. It also explains OFDMA TDD frame which consists of PUSC, FUSC and AMC Zones in the downlink and PUSC/AMC zones in the Uplink. OEO116120 LTE eRAN3. g. This avoids inter-network interference. LTE Frame Structure. LTE Frame structure. the amount of signaling overhead. TDD frame structure can thus be configured into 7 different formats of 1ms-subframes. 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. Double-click or use the drop-down menu to set the system bandwidth and number of Resource Blocks (RB).