TDD involves intentionally writing a failing test, writing the minimum amount of application code that allows the test to pass, and running the test again to ensure it passes. FDD is a development methodology based on object model, feature list, dynamic feature teams, and milestones. The FDD documents the functional requirements for the project and provides a clear and detailed understanding of what the project will deliver. Next, you will learn about TDDs and the information commonly included in a TDD. FDD와 TDD의 차이는 바로 이 상향링크와 하향링크를 어떻게 나눠서 쓰는가의 이슈입니다. Functional tests test something larger, such as whether a transaction can still be executed. These tests are used to determine the performance of the transmitter and typically require the use of only one signal. , FDD’s ~25% spectral guard band overhead • Latency It depicts UMTS TDD and FDD frame structures. TD-LTE noise figure is about 1. The ultrareliable and low-latency communication (URLLC) is one of the key scenarios of the current 5G new radio (NR). CDMA stands for Code Division Multiple Access. This approach enables asymmetric traffic and time-varying uplink and downlink demands. 08. And this is a technique of development that is focused on the needs of the user is met. FDD는 상향링크와 하향링크를 서로 다른 주파수에 배정을 하게 됩니다. 0% 80. What are main differences among the Preamble Format ? : Length of Preamble. It is a software development process, it is not only about writing tests before code. Up to 64-QAM. Aug 29, 2013. BDD uses the same principles as TDD but applies them on a larger scale. Carrier aggregation may be used with both FDD and TDD component carriers. WiMax rel 1. FR1 (4. Currently the LTE bands between 1 & 22 are for paired spectrum, i. 2 Time-Division Duplexing. The difference is that a device uses two frequencies, one for communications to, and the other for communications from the network, in FDD mode, versus using only one frequency in TDD mode. TDD. The test is then used to create and refactor code unto the code passes the tests. There are a couple of methods of doing this, called FDD and TDD. . Differing from others, FDD modelling is a cross-functional. darcypoulin. The key difference between LTE TDD, sometimes also known as TD-LTE, and the frequency division duplex (FDD) version more common today is in what spectrum the technology is deployed in. The two schemes are both widely used. FDD was also built around software engineering best practices such as domain object modeling, developing by feature and code ownership. There are two types of LTE Frequency Bands FDD and TDD. 1 GHz to 7. And since in "old waterfall world" tests come after implementation, then this mindset leads to wrong understanding and behaviour. The SUL link for uplink data transmission is provided by the NR FDD cell, that is, the SUL and NR FDD co-cell. 1. TDD is the abbreviated term for Test-Driven Development. - FDD stand for Frequency division duplexing, It separate in frequency the downstream. With this configuration, greater Band n41 coverage was documented as well as instances of. What is great is that it is very easy to work in large teams using FDD. BDD primarily focuses on user behavior. Hi! you. What is Difference between. Lower latency means faster response time, and vice versa. TDD has a 3 to 6 dB weaker link budget compared to FDD, depending on which radio. BDD directs focus on behaviour and specification, and so. Frequency range in which 5G NR operates are categories into following two designations. With traditional testing, a successful test finds one or more defects. Hence LTE radio frame will have duration of about 10ms. Test in TDD are written by programmer rather than testers. 2. An Agile methodology for developing software, Feature-Driven Development (FDD) is customer-centric, iterative, and incremental, with the goal of delivering tangible software results often and efficiently. However, vendors now manufacture devices which include both FDD and TDD capabilities, so in some case you may not expect the price. our article on Difference between TDD and FDD topologies. The main reason for reduced coverage is that the uplink device power is used part of the time for TDD but continuously for FDD . Build fast 5G LTE Networks. Test-Driven Designing and building tests for each single function of an application is the first. There are two major differences between LTE-TDD and LTE-FDD: how data is uploaded and downloaded, and what frequency spectra the networks are deployed in. 2. [RAN2] Handover: Study and identify mobility requirements and necessary measurements that may be needed for handovers between some non-terrestrial space-borne vehicles (such as Non Geo stationary satellites)Traditional duplexing TDD and FDD. Participants. In frequency-division duplexing (FDD), two disjoint frequency. Due to above, FDD system requires fewer base. RF and Wireless TerminologiesWhat is Difference between. Basically, TDD is a general term that refers to a process. 7. Hi, I am working on a HW with powered up default in FDD mode. Compared with the traditional TDD, NAFD can provide low-latency services. The differences between FDD and TDD are purely technical and the main one boils down to the fact that FDD is symmetrical (1:1 upload vs download), while TDD allows variable up / down ratio. The uplink enhancement technology used by NR TDD and NR FDD can significantly increase the uplink data rate. FDD needs two bands while TDD needs only one. Band 66 : The range 2180-2200 MHz of the DL operating band is restricted to E-UTRA operation when carrier aggregation is configuredFDD 8T8R will play a unique role in 5G networks and become the backbone of 5G fundamental networks. . Andrew-007 on Nov 25, 2015. As an example, an 1:1 UL/DL allocation means a duty cycle of ~50% in the uplink which contributes to a ~3dB reduced link budget; In capacity driven deployments, there is no coverage advantage. So the UEs could support both of TD-LTE and FDD-LTE with only one chipset, which can come true based on only minor modifications. 9G, 4G and 5G difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. You can write an acceptance test before coding, then code to make it pass; that's TFD but not TDD. FDD. 11 standards viz. FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i. It is a means of communication using one frequency to send and receive information. TDD, BDD, and ATDD are some of the popular software development techniques used for automated test coverage. LTE FDD and LTE TDD are virtually identical with the exception of a few technical charac-teristics that are specific to the Physical Layer. FDD LTE idealan je za simetrični promet, dok je TDD LTE idealan za asimetrični promet. The method of claim 1, wherein at least one of the first or second criteria includes a comparison of a difference in reference signal receive power (RSRP), as measured on primary and diversity paths, with a threshold value. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Mainly developers involve in this to write Unit Tests. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. 2. Software is considered valid if it passes the test cases. TDD systems are cheap compare to FDD systems due to requirement of less RF modules such as Synthesizer, Local Oscillators, filters etc. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. See page 8 of UG-570). One subframe duration is about 1 ms. US 28 GHz. The frequency ranges in which NR can operate are identified as described in TS 38. FDD and TDD are the two modes that WCDMA supports. 6. TDD is the winner in this case. Latency is the amount of time it takes for a signal to travel to and from a network server. id – Penerapan layanan 4G LTE di Indonesia saat ini sudah cukup besar penyebarannya. Due to factors such as differences in wireless Wifi technology, different frequency bands used, and the interests of various manufacturers, the standardization and production of FDD-LTE are ahead of TD-LTE. e. e. FDD Aggregating TDD to Enhance Capacity: FAST deepens FDD and TDD spectrum aggregation capability by maximizing the number of data streams in both downlink and uplink. 11 standards viz. While that may sound sarcastic, the point is that TDD (as usually practiced) has an implied U on the front, standing for Unit, while the A stands for Acceptance. While descriptions are simple and straightforward, the actual code might be complex. This overhead results in a considerable spectral efficiency (SE) gap between the FDD and TDD modes. In contrast, FDD, or Frequency. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. In some applications we need to switch to the TDD mode, is there a way to switch from the FDD mode to TDD mode and switch back? Thanks, CC. This section gives a high level overview of the activities. To understand TDD and FDD, we have started with,Hal. In this mode, we are not using VCO calibration since it is started in FDD mode and it automatically calibrates VCO. TDD focuses on lower levels - unit and perhaps integration tests. Some cellular systems use TDD, while others use FDD. The whole book is trying to explain it by patterns, workflows, culture and so forth. FDD LTE is typically deployed in urban areas, while TDD LTE is typically deployed in suburban and rural areas. Then as standards evolve, the FDD benefit will continue to increase with a capacity gain of up to three times and boost the user. The main bands for China are TD bands 40 and 41. However, the frequency bands for 5G wireless technology are classified into FR1 and FR2 frequency ranges. ITU Option 3: Flexibility - the bidders for spectrum can decide how they want to allocate the spectrum they acquire to. TDD LTE je puno bolji u raspodjeli prometa od FDD LTE. What is Difference between. This paper describes the LTE technology in detail and highlights any differences between LTE TDD and LTE FDD technology. These topologies are widely used in advanced wireless communication systems such as WLAN, WiMAX(fixed/mobile), LTE and so on. Key Difference Between LTE FDD vs TDD. . LTE frequency band and arfcn calculator. Hi, I am working on a HW with powered up default in FDD mode. Testing proceeds in various categories such as functional, behavior, acceptance, and more. WRC-97),. Factors such as the project's size, complexity, domain, and lifecycle; the stakeholders. Next, the user shares its uplink transmission (downlink reception) on the corresponding frequency band with the uplink transmission or the downlink reception of another user in a D-TDD fashion. As shown in Fig. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Other frameworks test that the application works on multiple versions of the targeted operating systems, different screen orientations on. TDD is a software development approach where a developer writes a test before writing any code. Figure 1 shows a TDMA/TDD frame structure. Test First Development is slightly broader, slightly less specific, than TDD. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM Bluetooth vs zigbee Fixed wimax vs mobileCarrier aggregation can be used for both FDD and TDD, see figure 1 for an example where FDD is used. Definition and Differences between TDD and FDD,duplex mode, speed rate,coverage and the movement speed of mobile station. While TDD is a development methodology, it also comes in handy during automation testing development. FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i. g. Time Division Duplex Wireless is a fundamental technology for 5G deployments around the world. Collaboration is the key for BDD to be successful. 3. In FDD operation, two different carrier frequencies are used for DL and UL. Frequency division duplex (FDD) and time division duplex (TDD) are two different duplex modes. , TDD 3-5 GHz. Thanks. FDD LTE uses frequency division, while TDD LTE uses time division. What is Difference between. 1UL(TDD): PC1. TDD focuses on lower levels - unit and perhaps integration tests. Collaboration is the key for BDD to be successful. ATDD focuses on system tests. T-Mobile also uses its 600MHz low-band spectrum on LTE Band 71, which was formerly used by channels 38 to 51 on UHF-based TVs. coverage Compared with FDD, the coverage capability is weaker for TDD since its discontinuous signal transmission. FDMA doesn't need any synchronization,. Frequency division duplex (FDD) and time division duplex (TDD) are two different duplex modes. FDD needs two bands while TDD needs only one. 75% from 280 Mbit/s to 332. 1) Even i check the enable statemachine in 0x017 register ,it shows in FDD mode. Frequency range designation: Corresponding frequency range: FR1: 410 MHz – 7125 MHz: FR2-1: 24250 MHz – 52600 MHz: FR2-2: 52600 MHz – 71000 MHzSubject - Mobile Communication SystemVideo Name - FDD and TDDChapter - Fundamentals of Mobile CommunicationFaculty - Prof. We investigated TDD/FDD/NAFD three duplex technologies in terms of latency performance under URLLC scenarios including control-plane latency and user-plane latency. 5ms. 3. If the feature is implemented in Java, we write JUnit test cases. KTH Royal Institute of Technology. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Few major differences in TDD Radio frame structure results in. BDD is designed to test an application’s behavior from the end user’s standpoint, whereas TDD is focused on testing smaller pieces of functionality in isolation. Test Driven Development (TDD) Test-driven development (TDD) is the name of a methodology introduced by Kent Beck in his book "Test Driven Development by Example". 1-1: Definition of frequency ranges. But there are many key differences between these standards, and below are some of the prominent ones. confusion. 11 standards viz. TDD uses a single frequency band for both transmit and receive. e. However, recently as IoT /M2M /MTC / Category 0 / Category M/LTE-M over LTE becomes a hot topic, FDD Half-Duplex is coming. Time is divided up into short slots and some are designated for uplink while others are designated for downlink. SAW Devices-Filters, Resonators, DuplexersTDD (ˆ) = 1 L XL ‘=1 TDD H‘ );ˆ: (5) Problem (4) is convex and can be efficiently solved by a simple gradient search, or via a technique known as sum-power iterative waterfilling [29], [30]. . difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Actually FDD Half-Duplex was discussed even from the initial LTE design, but hasn't gotten much attraction for a long time. In TDMA, the time slot allocated to a user does not depend on whether or not the user has any data to be transmitted. View the TI Small cell base station block diagram, product recommendations, reference designs and start designing. Mainly developers involve in this to write Unit Tests. There is nothing that I added myself. Below is the main difference between Test driven development and traditional testing: TDD approach is primarily a specification technique. More relaxed TDD timing configurations + FDD operation DL Ctrl DL DL Data UL Data UL Ctrl UL Mini-slot Optimized for shorter data transmissions, e. Therefore the TD-LTE offers less coverage than LTE FDD. FDMA stands for Frequency Division Multiple Access. The greater likelihood is that a single UE or mobile will need to detect whether a TDD or FDD. 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. 11 standards viz. You can modify the driver to use the longer calibration counts in TDD mode (TDD uses a 256 count while FDD uses a 1024 count for VCO cals. : ATDD is very similar to BDD (Behavior-driven development). The support for both TDD, half and full-duplex FDD is handled by two very similar frame structures: frame structure type 1 for half and full-duplex FDD and frame structure type 2 for TDD. Then it shares that band by assigning alternating time slots to transmit and receive operations. By aggregating multiple channels together a mobile network operator can increase the total available bandwidth of a single transmission, and thereby increase the bitrate and. TDD/FDD Ecosystem This one is the significant difference of all. While LTE-FDD uses paired frequencies to upload and download data, LTE-TDD uses a single frequency, alternating between uploading and downloading data through time. It’s a software development technique used by an end-to-end IT services company where they create the test cases before writing the code below those test cases. support across FDD and TDD • Switched uplink (FDD-TDD switching in SA mode) • Advanced power-saving tech • Qualcomm® 5G PowerSave Gen 3 • Qualcomm® QET7100 Wideband Envelope Tracking • Voice over NR support Specifications • 5G Chipset: Snapdragon X70 Modem-RF System • 5G Spectrum: mmWave-sub6 aggregation, sub-6. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM Bluetooth vs zigbee. We describe some differences between the modes concerning layer 1 aspects. Experimental evolution. Feedback-Based FDD Beamforming with Predetermined Beams Feedback-based beamforming relies on the reporting of quantized CSI from the UEs to the. Participants. Link to the detailed post on FDD and TDD: = Frequency Division DuplexTDD = Time. Time Division Duplex Wireless is a fundamental technology for 5G deployments around the world. 11 standards viz. TDD is about code design. Menu Home; 5G Technology. It is finally time to uncover the mystery between FDD vs. Test-Driven Development (TDD), Domain-Driven Design (DDD), Behavior-Driven Design (BDD) and Feature-Driven Design (FDD) are some of the more well known approaches. BDDs are written in. 5ms duration. In this approach, we first convert software requirements into unit test cases (a set of actions that verify a specific feature or functionality) before developing the software. D. The advantage of TDD is a simplified and lower cost design, often based upon 802. ATDD tests are easily read by humans, using business- or user-centric terms in a conventional format, such as now/if/then, as opposed to the functionality focus typical of TDD. Difference between Time Division Duplexing (TDD) and Frequency Division Duplexing (FDD) in Wireless Communication: 1. TDD ensures that the product, system or process is being built correctly. pdf from BIOLOGY 2108 at Addis Ababa University. TDD Process. 5G TDD SYNCHRONISATION In today’s networks, the amount of traffic between the user terminal and the base station (the uplink) and vice versa (the downlink) is often asymmetrical (because users download more than they upload). An Agile methodology for developing software, Feature-Driven Development (FDD) is customer-centric, iterative, and incremental, with the goal of delivering tangible software results often and efficiently. FDD는 상향링크와 하향링크를 서로 다른 주파수에 배정을 하게 됩니다. For example in China, the dominant (and at the beginning of commercial LTE, the only) market of TDD LTE, Youtube video streaming takes a large. . Frequency division duplex (FDD) and time division duplex (TDD) are two. In FDD topology, different frequencies are used for both uplink and. FDD dominates since beginning of mobile communication era. Parameter. That may change in the future, though, and technologically FDD systems also benefit from better economies of scale since the implementation of TDD systems is limited. But there is plenty of FDD spectrum currently in use so that is why. The next phase of 5G NR deployments will be based on FDD in the paired spectrum, as almost 90 percent of the spectrum below 8 GHz is organized as paired. It is a software development process, it is not only about writing tests before code. This ingenious method enables full-duplex (simultaneous) communication over a half-duplex (serial-binary) link. AD9361 FDD TDD Mode Switching. The specification for true 5G calls for about 1 millisecond, while 4G’s ideal rate is 10ms. Hope that helps. To assess potential differences in the fine-scale spatial variation of temperature conditions in summer versus winter, we first standardized the FDD and TDD variables between 0 and 1 using their. 3) Develop the code for that test cases: If the test case fails, then, write the code to make that test. LTE has radio frame of duration 10ms consisting of 10 subframes. 26 Figure 5-11: LTE subframe structure for TDD operation, indicating subframes which should not beITU Option 1: Preconfigured allocations of paired (FDD) and unpaired (TDD) spectrum - 2x70MHz for FDD and 50MHz for TDD. FDD-LTE utilizes paired spectrum blocks for uplink and downlink communication, while TDD-LTE uses a single frequency band for uplink and downlink. As a document and you can name as any of the mentioned. e. The transmit and receive frequencies are separated by a defined frequency offset. • In FDD mode, both. The slot is of 0. That would give you the FDD calibrations and TDD (like) control over the part. URLLCComprender los sistemas de microondas FDD vs. 0% 120. 8GHz. Hal ini terlihat dari semakin luasnya coverage para operator penyelenggara layanan generasi keempat ini. 5G, 4. Some frequency bands (most of the FR1 frequency-division duplex (FDD) bands, a handful of FR1 time-division duplex (TDD) bands, and all FR2 bands) require a baseline NR device to be equipped with two receive branches, whereas some other frequency bands, mostly in the FR1 TDD bands, require the device to be equipped with. 2 Time division duplexing (TDD) TDD allows uplink and downlink to use the entire frequency spectrum, but in different time slots. BDD primarily focuses on user behavior. ATDD focuses on capturing the accurate requirements. Time Division Duplex (TDD) accomplishes this using different time slots for uplink and downlink signals over the same frequency. 11 standards viz. We use the recent results on the achievable rates of finite-length codes to analyze the end-to-end throughput and the data payload for TDD and FDD in. FDD LTE koristi upareni spektar, dok TDD LTE koristi neupareni spektar. Process Of TDD. The information to be transmitted—whether it’s voice, video,. , unlicensed 6 GHz mmWave e. With FDD, two different carrier frequencies, one from each band, are assigned to a user; one carrier frequency for transmission from the user (also known as upstream, return link, or uplink) and one carrier frequency for reception by the user (also known as. Upload. FDD-LTE offers better coverage than TD-LTE, but the two technologies. FDD stands for Frequency Division Duplex and TDD stands for Time Division Duplex. Jeenal RambhiaUpskill and get Plac. LTE-TDD and LTE-FDD are presented and compared in articles [9], [10]. 39 GHz. 3. . TDD come with many benefits over FDD, but operators have always shown interest in features that target uplink efficiency and coverage because of the frame structure, and the nature of the spectrum unutilized for TDD. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. g. 예를 들어 우리나라 신문에서 모 이동통신사가 정부로부터 LTE로 20MHz를 할당받았다는 기사가. Two. 1. FDD LTE is more mature than TDD LTE, but TDD LTE is rapidly catching up. LTE has radio frame of duration 10ms consisting of 10 subframes. FDD stands for Frequency Division Duplex, and TDD stands for Time Division Duplex. The only difference between FDD and TDD for paging takes place in. Refer what is 5G NR? and its features. Carrier Aggregation (CA) is a technique used in LTE-Advanced to increase the peak data rate (i. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. For LTE it will be question about the legacy spectrum and possibility to change from FDD to TDD. TDD is well-suited for smaller units of code, while BDD works well for applications that require you to consider the big picture. 1. It consists of five basic activities, namely, the development of an overall model, the building of a. 0%DDDSU is the frame structure most suitable in 5G. 5: 802. it is designed for high speed human data connection, and high speed human data connection favors downlink. 11 standards viz. 5ms duration. GSM/UMTS mostly utilized 900 and 1800 MHz frequency bands while 4G LTE utilized frequencies of up to 6. Transport planners face unprecedented challenges to align upgraded RAN networks with LTE Advanced technologies and 5G. BDD is a good approach to go here. The following illustration shows part of an LTE uplink frame and contains an allocation for each type of uplink channel. 5. You can use TDD in DDD. Difference of TDD and FDD. The difference between FDD and TDD in Microwave Transmission Microwave ODU with Antenna using FDD (Frequency Division Duplex) Microwave links typically use Frequency-division duplexing (FDD) which is a method for establishing a full-duplex communications link that uses two different radio frequencies for transmitter and receiver operation. TDD is commonly used in applications that require symmetrical data transmission, such as video conferencing and streaming, where there is a need for an equal amount of upstream and downstream. TDD. In an emergency situation, where a fraction of a second can make a significant difference, the deployment of a mini-slot can ensure the prompt delivery of vital information. FDD LTE Frequency Bands Many chipsets used in modern devices can operate with either FDD or TDD, usually within specific frequency ranges. TDD focuses on the low level, ATDD on high level. channel coding. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. Table 1. resources on the UL, then the power on each RB is less than that of LTE FDD. TDD and TDMA are both widely used wireless communication technologies that provide efficient and reliable transmission and reception of data. The DL and UL transmission in are time division, so to achieve the same edge throughput as LTE FDD, TD-LTE needs to use more RB. Here's my take on the differences: Waterfall is a software development methodology where each kind of development activity happens in a separate phase (requirements gathering, design, development, testing. T-Mobile is also using more of the mid-band airwaves than others. 2. What is Difference between. RF and Wireless TerminologiesThe 3 Methodologies (TDD, DDD, and BDD) The promise of better development through a hybrid solution of multiple methods works – but you can’t utilize just any three. When it comes to choosing between BDD and TDD for automation testing, there is no one-size-fits-all answer. In TDD collaboration is required only between the developers. 8 Mbit/s, which is an eight-fold increase. In addition, there must be adequate spectrum separation between the transmit and receive channels. Please checkout the link -are two ways of implementing the duplex communication. Additionally, NR supports transmission based on mini-slot (a fraction of a slot) as a minimum scheduling unit. In case of paging, the parameters remain same for both TDD and FDD. And since in "old waterfall world" tests come after implementation, then this mindset leads to wrong understanding and behaviour. Key Difference Between LTE FDD vs TDD. RUP: Rational Unified Process. TI E2E™ forums with technical support from TI engineers. 3 GHz band. BDD is TDD. FDD is an older scheme that was best suited for applications, such as voice, that generate symmetric traffic, while TDD is best suited for bursty, asymmetric traffic, such as Internet or other datacentric services. Ascom (2010) Document: NT10-00185 5(9) 3 Differences between FDD-LTE and. Our Massive MIMO implementation will directly enable today’s FDD devices to benefit from beamforming. The basics. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM Bluetooth vs zigbee Fixed wimax vs mobile RF and Wireless TerminologiesThis video has been re uploaded with Human Voice for better understanding. However, time division duplex (TDD) has poor delay performance due to the extra data waiting delay caused by the frequent uplink/downlink. To me primary difference between BDD and TDD is focus and wording. . TDD can be better if you have a service which is very asymmetric, as you can dynamically allocate more time ( and hence throughput) in one direction than the other, e. , maximum available speed) of a 4G LTE network. Feedback-Based FDD Beamforming with Predetermined Beams Feedback-based beamforming relies on the reporting of quantized CSI from the UEs to the. And words are important for communicating your intent. Language: TDD uses code-based.