g. 16-2009: WirelessMAN: MIMO-SOFDMA: 83 (20 MHz TDD) 141. 1, here number of component carriers(CCs) and bandwidth of each component carriers are same for both. You can also create a combined design document (FDD/TDD) for the entire solution. Report. ) For small, co-located, developer-centric teams, TDD and BDD are effectively the. This solution applies when an operator has spectrums that support both NR FDD and SUL. Carrier Aggregation in TDD. , FDD’s ~25% spectral guard band overhead • Latency It depicts UMTS TDD and FDD frame structures. Follow • 41 likes •. For example, I read TDD MODE FASTER LOCK TIMES part (page 19 in UG-570) but as per my understanding, this section is for frequency hopping. What is Difference between. These topologies are widely used in advanced wireless communication systems such as WLAN, WiMAX(fixed/mobile), LTE and so on. And since in "old waterfall world" tests come after implementation, then this mindset leads to wrong understanding and behaviour. example below. TDD stands for Time Division Duplex. What is Difference between. Guard time between adjacent slots is necessary. The different 4G LTE frequency allocations or LTE frequency bands are allocated numbers. Skip to content 5G Networks. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM Bluetooth vs zigbee Fixed wimax vs mobile wibro vs mobile wimax. Networks on LTE band 20 (LTE-FDD) are suitable for roaming in ITU Region 1 only. 5: 802. Frequency division duplex (FDD) and time division duplex (TDD) are two different duplex modes. 11-a,11-b,11-g and 11. As we know TDD stands for Time Division Duplex and FDD stands for Frequency Division Duplex. FDD and TDD uplink transmissions have the same physical channels and signals. 예를 들어 우리나라 신문에서 모 이동통신사가 정부로부터 LTE로 20MHz를 할당받았다는 기사가. The differences among these traces are with SCS (Subcarrier Spacing). The packages are separated by a small amount of time. channel coding. FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i. 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. The specification for true 5G calls for about 1 millisecond, while 4G’s ideal rate is 10ms. coverage Compared with FDD, the coverage capability is weaker for TDD since its discontinuous signal transmission. To me primary difference between BDD and TDD is focus and wording. This is a technique of development that focuses on the behavior that is expected. In recent years. The uplink enhancement technology used by NR TDD and NR FDD can significantly increase the uplink data rate. It is same as TDD. What is Difference between. The principal difference in ATDD vs. FRC. 5G NR frequency bands. 11a/n/ac/ah family as well as in the emerging 5G. TDD – Finalmente, es hora de descubrir el misterio entre FDD y TDD, específicamente la importancia de FDD como elemento clave en el rendimiento de la red. The majority of current systems are FDD 2G : (GSM) FDD only 3G : (WCDMA) Mainly FDD deployments, but there are TDD variants which are in use in. While descriptions are simple and straightforward, the actual code might be complex. TDD, or time division duplex, adds the time factor in addition to isolating users with code and frequencies. FDD allows teams to update the project. Convenience Feasibility Operators’ requirements Traffic Pattern and Usage Etc. Software is considered valid if it passes the test cases. Carrier aggregation may be used with both FDD and TDD component carriers. Submit Search. , maximum available speed) of a 4G LTE network. ATDD. The TDD approach focuses on the implementation. 5G Frequency Bands. Table 5. 2) Run all the test cases: Run these automated test cases on the currently developed code. What is Difference between. 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. In this first process, FDD pushes teams to build an object model of the domain problem. TDD. : ATDD is very similar to BDD (Behavior-driven development). Feb 1, 2021. 5G, 4. 1. I wanted to make this note just for easy referencing. 8GHz. Fifteen paired (for FDD operation) and eight unpaired (for TDD operation) spectrum bands have already. Developers, QAs and Customers involve in this process. Projects in which user is the one who acts, such as: eCommerce sites, various types of apps. BDD primarily focuses on user behavior. This results in reducing the price of the device for TDD. It is originally designed for Full Duplex and probably more easier to operate in Full-Duplex mode. BDD focuses on the system's behavior. Each subframe has two slots. 02. In this, sharing of bandwidth among different stations takes place. So far, TDD has been the most widely used duplexing technique due to. This is used in cellular applications. BDD is TDD. Trace (A) represents the case with the shortest SCS (75 Khz) and Trace (D. TDD is the language used in test creation. The template can help you capture a detailed description of the. The fundamental characteristics of FDD and TDD however also lead to differences: Major Differences between TDD and FDD. TDD has a 3 to 6 dB weaker link budget compared to FDD, depending on which radio. 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. With FDD-TDD CA, Band n71 is used for the P Cell with Band n41 (100 MHz channel) serving as the S Cell. 5G offers an extremely low latency rate. This solution applies when an operator has spectrums that support both NR FDD and SUL. FDD-LTE offers better coverage than TD-LTE, but the two technologies. In the case of differences between FDD and TDD, these differences are explicitly indicated. [citation needed] It is more formally as IMT-2000 CDMA-TDD or IMT 2000 Time-Division (IMT-TD). Kanban is better suited for teams that have a lot. These various styles are listed here: ATDD, Acceptance Test Driven Development, TDD, Test Driven Development: In test-driven development, writing the test is the thing that’s done first. WiMax rel 1: 802. BDD involves asking what the purpose of a feature or application is, writing the acceptance. Definition. 11 standards viz. Ces topologies sont largement utilisées dans les systèmes de communication sans fil avancés tels que WLAN, WiMAX (fixe / mobile), LTE et ainsi de. Build fast 5G LTE Networks. What is Difference between. resources on the UL, then the power on each RB is less than that of LTE FDD. Next, you will learn about TDDs and the information commonly included in a TDD. This provides simultaneous exchange of information and reduces interference between the uplink and. BDD is a specification technique based on user stories and test scenarios. Each approach caters to a different need. AMDD refers to Agile Model Driven Development. BDD directs focus on behaviour and specification, and so. FDD LTE is full duplex, while TDD LTE is half duplex 3. While BDD (Behavior-Driven Development) is a team technique, TDD (Test-Driven Development) is a development practice. In this post, we'll examine two popular Agile methodologies and outline their pros and cons. 2. Time Division Duplex (TDD) and Frequency Division Duplex (FDD) [1]- [4] have been the dominant spectrum access techniques both in the IEEE 802. 2 Time division duplexing (TDD) TDD allows uplink and downlink to use the entire frequency spectrum, but in different time slots. Special characteristics and specific challenges to be faced during network. Resolution 212 (Rev. TI E2E™ forums with technical support from TI engineers. TDD LTE is much better in the allocation of traffic than FDD LTE. To know in-depth difference between both of these terms refer following links. Frequency bands for 5G NR are separated into two different frequency ranges. 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. What is Difference between. What are main differences among the Preamble Format ? : Length of Preamble. Typically, T-Mobile would serve up to 110MHz, while AT&T uses around 40MHz and Verizon uses around 60MHz. 3 Hong Kong also used terminals equipped with Qualcomm's Snapdragon X12 LTE processor. 5G low-band (below 7GHz frequency division duplex, FDD) is the most commonly deployed band. 11 standards viz. In the case of differences between FDD and TDD, these differences will be explicitly indicated. TDD. For example, a walkie-talkie or a DECT phone or so-called TDD 4G or 5G phones requires only a single frequency for bidirectional communication, while a cell phone in the so-called FDD mode is a full-duplex device, and generally requires two frequencies to carry the two simultaneous voice channels, one in each direction. Frequency-division multiplexing (FDM) is also distinct from FDMA. As the name implies, involves utilizing tests to guide application development, resulting in simple, iterative implementation with good test coverage right from the start. cc86 on Jan 30, 2015. When it comes to choosing between BDD and TDD for automation testing, there is no one-size-fits-all answer. So far, TDD has been the most widely used duplexing technique due to its simplicity. FDD (Frequency Division Duplex) is a technique in mobile networks that uses separate frequency bands for uplink and downlink communication; TDD (Time Division Duplex) is a technique that uses the same frequency band for uplink and downlink but only communicates in one direction at a time. This blog examines technology drivers, options and considerations related to timing and synchronization, key factors in the planning of 5G networks. TDD focuses on the low level, ATDD on high level. Feature Driven Design has a bit of eXtreme Programming as well as a bit of Scrum but adding to them Domain Driven Design techniques. * In TDD, both the transmitter and receiver operate on the same frequency but at different times. In NR, there are roughly two large frequency range specified in 3GPP. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. The first generation of 5G modems and mobile devices only support the TDD mode for FR1. In FDD, two distinct frequency bands are used, one for transmitting from the base station to the user equipment (downlink) and. Improve this answer. FDMA stands for Frequency Division Multiple Access. A. Frequency range in which 5G NR operates are categories into following two designations. This includes radio link management. Frequency Division Duplexing (FDD) is a full-duplex method that uses two different frequencies for transmit and receive operations. TDD, or Time Division Duplex, where a single radio channel is used to send and receive data, has been a common technique employed in unlicensed microwave transmission bands, such as 2. Which also means that, in. Note however that the regulatory aspects are different as well, so both the allowed power levels and bandwidths are generally going to be different for TDD vs. Despite actually running into the 7 GHz band, FR1 continues to be commonly referred to as the "Sub-6 GHz" band. 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. g. Collaboration is the key for BDD to be successful. B. FDD-LTE (周波数分割二重) と TDD-LTE (時分割二重) は、LTE (Long-Term Evolution) 無線通信技術を実装する XNUMX つの異なる方法です。 FDD-LTE はアップリンクとダウンリンクのデータ送信に別々の周波数帯域を使用しますが、TDD-LTE はアップリンクとダウンリンクに交互のタイムスロットを持つ同じ周波数. In this paper resource allocation schemes for both UMTS modes (TDD and FDD) are discussed. Time synchronization is also required in FDD networks when different radio coordination features are used. Time Division Duplex (TDD) accomplishes this using different time slots for uplink and downlink signals over the same frequency. While descriptions are simple and straightforward, the actual code might be complex. This page compares 5G FDD vs 5G TDD and describes difference between FDD and TDD in 5G wireless network. Both technologies use time division to partition the available bandwidth. as in FDD. For paired spectrum(FDD), all PRACH occasions are valid. 3. BDD primarily focuses on user behavior. 6GHz band is already specified for TDD, namely the 2570MHz-to-2620MHz band. "Seamless handover between FDD-LTE and TDD-LTE networks is a critical feature. e. If the device supports full-duplex FDD (FD-FDD) operation, it can perform reception and transmission at the same time, whereas if the. RF and Wireless TerminologiesThe below paragraph should indicate the difference between FDD and TDD duplexing methods, FDD is a full duplex system and TDD is a half duplex system, which means, in case of FDD, both the downlink and uplink will be ON together and in case of TDD, either of downlink or uplink will be ON at any given time. 2. In this paper, we compare two common modes of duplexing in wireless powered communication networks (WPCN); namely TDD and FDD. 11. our article on Difference between TDD and FDD topologies. TDD refers to Test Driven Development. ATDD focuses on system tests. The slot is of 0. What is Difference between. FDD LTE tốt hơn đối với giao thông đối xứng, trong khi TDD tốt hơn cho lưu lượng bất đối xứng. Link to the detailed post on FDD and TDD: = Frequency Division DuplexTDD = Time. Frequency Division Duplexing (FDD) is a method that is used for establishing a full-duplex communications link by using two different radio frequencies for transmit and receive operations. 11 standards viz. For DL carrier aggregation,. 5G NR (New Radio) has been developed to operate in two distinct bands; sub-6 GHz (3GPP 38. 3. FDD stands for Frequency Division Duplex, and TDD stands for Time Division Duplex. In TDD topology, same frequency is used for both uplink and downlink directions but they use different time slots for transmissions. 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. 11-a,11-b,11-g and 11-n OFDM vs OFDMA RF heterodyne versus homodyne receiver white noise Vs. It is a means of communication using one frequency to send and receive information. 11 standards viz. Perbedaan fdd dan tdd menjadi penting karena setiap teknologi memiliki keunggulan dan kelemahan masing-masing. TDD uses a single frequency band for both transmit and receive. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. to most industry followers, LTE FDD and LTE TDD share a common core network with abso-lutely no distinction between the two duplexing modes of LTE. 5G is the fifth generation cellular network technology, and operates in different frequency bands depending on the specific operator and region. n78: 5G Band (3500MHz) Contact Us;. Whereas BDD & ATDD is written in simple English. ATDD focuses on system tests. FDD and TDD are the two modes that WCDMA supports. DDD is about software design. The Work Item considers FDD operation, TDD operation as well as TDD-FDD carrier aggregation operation when applicable. Furthermore, the TDD mode, also known as TD-LTE, is designed with coexistence between LTE (TDD) and TD-SCDMA in mind to simplify a gradual migration from TD-SCDMA to LTE. FDD-LTE utilizes paired spectrum blocks for uplink and downlink communication, while TDD-LTE uses a single frequency band for uplink and downlink. B. The code is written to make the. In time-division duplexing (TDD), time rather than frequency is used to separate the transmission and reception of the signals, and thus a single frequency is assigned to a user for both directions. What is Difference between. : ATDD is very similar to BDD (Behavior-driven development). In 3G, FDD based implementation is called WCDMA and TDD based implementation is called TDSCDMA. It has a higher bandwidth and. 11 standards viz. The principal difference in ATDD vs. به طور کلی FDD همانند سیستم GSM استفاده ی گسترده ای در سیستم تلفن های سلولی دارد. Table 5. BDD uses the same principles as TDD but applies them on a larger scale. Disadvantages with TDD. FDD in Agile encourages status reporting at all levels, which helps to track progress and results. The SUL link for uplink data transmission is provided by the NR FDD cell, that is, the SUL and NR FDD co-cell. Frequency bands for 5G New Radio (5G NR), which is the air interface or radio access technology of the 5G mobile networks, are separated into two different frequency ranges. Key Difference Between LTE FDD vs TDD. Then it shares that band by assigning alternating time slots to transmit and receive operations. US 28 GHz. Refer what is 5G NR? and its features. These topologies are widely used in wireless communication systems such as WLAN, Fixed and Mobile WiMax, 4G LTE, 5G NR and. Operator. TDD (Time Division Duplex) signifie le duplex par répartition dans le temps et FDD (Frequency Division Duplex) signifie duplex par répartition en fréquence. The goal of agile software development models. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. MAC layer in TDD system is complex. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. RF and Wireless Terminologieslte carrier aggregation. g. Bukan hanya itu, ketersediaan smartphone yang mendukung layanan ini dengan harga. For unpaired spectrum(TDD),In the case of differences between FDD and TDD, these differences will be explicitly indicated. FDD needs two bands while TDD needs only one. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. There is nothing that I added myself. Huge difference. The main difference between FDD and TDD lies in the use of different duplex modes. The slot is of 0. * In TDD, both the transmitter and receiver operate on the same frequency but at different times. Although FDD is considered the best strategy in principle for mobile networks, LTE/4G already has some bands for TDD, and its usage is expected to increase on 5G. BDD is a technique to see that process through, as is ATDD. That would give you the FDD calibrations and TDD (like) control over the part. It uses paired spectrum on continuous basis for both the directions and hence it can achieve higher rates for similar distances as TDD system. View ABC (7). 5 Mbit/s. BDD is a good approach to go here. 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. CDMA stands for Code Division Multiple Access. The paging occasion (subframe) location is different in FDD versus TDD . FDD-LTE (Song công phân chia tần số) và TDD-LTE (Song công phân chia thời gian) là hai phương pháp khác nhau để triển khai công nghệ truyền thông không dây LTE (Tiến hóa dài hạn). To know more about TDD vs FDD refer our article on Difference between TDD and FDD topologies. TDD (Time Division Duplex) LTE Bands require only a single band which is used for both the uplink and downlink. 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. solution requires co-site deployment of NR TDD and NR FDD base stations [7]. Typically,. As shown in the figure below, an LTE TDD frame is made of total 20 slots, each of 0. The main reason for reduced coverage is that the uplink device power is used part of the time for TDD but continuously for FDD . TI E2E™ forums with technical support from TI engineers. Test-Driven Designing and building tests for each single function of an application is the first. 3. 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. On the other hand, TDD uses the entire channel but alternates between uploading and downloading. The packages are separated by a small amount of time. DDDDDDDSUU is the frame structure used in case of coexistence for synchronisation between 4G TDD and 5G TDD. It is a technology that distinguishes wireless channels in time. Time-division duplexing (TDD) is a method for emulating full-duplex communication over a half-duplex communication link. FDD-LTE sử dụng các dải tần riêng biệt để truyền dữ liệu đường lên và đường xuống, trong khi TDD-LTE sử dụng cùng một dải tần với các. Figure 1 shows a TDMA/TDD frame structure. 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. TDD is about code design. Yet, TDD does not allow the energy transmitter to function continuously, which means to deliver the same amount of energy as that in FDD, the transmitter has to have a higher maximum transmit power. TDD (Time Division Duplex) LTE Bands require only a single band which is used for both the uplink and downlink. Some cellular systems use TDD, while others use FDD. View the TI Small cell base station block diagram, product recommendations, reference designs and start designing. Frequency division duplex (FDD) massive multiple-input multiple-output (MIMO) systems introduce a large overhead in downlink channel estimation in contrast to the time division duplex (TDD) mode. What is Difference between. TDD is a duplex method of communication systems that is used in mobile communication systems to separate receiving and transmitting channels. TDMA stands for Time Division Multiple Access. 2 Time division duplexing (TDD) TDD allows uplink and downlink to use the entire frequency spectrum, but in different time slots. Applies to: Dynamics 365. FDD LTE je došao iz 3G mrežne migracije, dok je TDD LTE došao iz TD-SCDMA. 1UL(TDD): PC1. e. FDD LTE is typically deployed in urban areas, while TDD LTE is typically deployed in suburban and rural areas. FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i. Example 01 > TDD FR2 RachConfig = 70, SCS = 120 Khz, Format A3; Example 02 > TDD FR2 RachConfig = 71, SCS = 120 Khz, Format A3. In addition, there must be adequate spectrum separation between the transmit and receive channels. FDMA doesn't need any synchronization,. 11 standards viz. Difference of TDD and FDD. This section gives a high level overview of the activities. case of subframes (paging occasions)—- the subframe in which paging message arrives. What is great is that it is very easy to work in large teams using FDD. And writing a unit test for a private function then coding to make that test pass is TDD. Topic:- FDD and TDD☑☑☑Telegram Channel link👉MORE UPDATES👇. I’m at a stage now where I use all 3. pdf from BIOLOGY 2108 at Addis Ababa University. **Basic Concept:** - **TDD (Time Division Duplexing):** In TDD, a single channel is used for both transmission and reception, but they occur at different time intervals. 1 GHz to 7. Functional tests test something larger, such as whether a transaction can still be executed. 3. Depending on the ranges, the maximum bandwidth and subcarrier spacing varies. Sub-6 is the 5G of the present, while mmWave is clearly the 5G of the future. Either of these can be combined with BDD to express tests to be more widely accessible to the variety of stakeholders involved in system development. 11 standards viz. The difference between ATDD and BDD is that ATDD mainly focuses on accuracy of requirements, vs. ~5-7dB, mainly due to differences of the transmit power, the TDD carrier frequency link budget and number of12. ). 0% 120. Unit tests test individual lines of code. But it isn’t quite that simple. there are total 20 slots in a radio frame. We describe some differences between the modes concerning layer 1 aspects. What’s the Difference between TDD and FDD Since 4G Technology is becoming more and more known, most people may know TDD or FDD, but may not. . In general, FDD is considered better for coverage and TDD better for capacity Mobile operators are looking to carrier aggregation (CA), which allows them to use multiple sub-6 GHz spectrum channels simultaneously, as a method of increasing the bandwidth and speeds of their 5G networks. Due to above, FDD system requires fewer base. FDD LTE is full duplex, while TDD LTE is half duplex. What is Difference between. In TDD topology, same frequency is used for both uplink and downlink directions but they use different time slots for transmissions. Some standards also allow for the use of either as both FDD and TDD have their own advantages and disadvantages. View the TI Small cell base station block diagram, product recommendations, reference designs and start designing. While these philosophies all imbibe the classic agile principles of an incremental and iterative mindset to software development, they subtly differ from each other. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. It provides a wide coverage area because it has a lower frequency. Test-Driven Development (TDD) is a practice which involves writing unit tests for a unit of code before the unit of code itself is written. Parameter. 2. 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. It tests independent small units or objects to make sure each works as intended. 3. FDD와 TDD의 차이는 바로 이 상향링크와 하향링크를 어떻게 나눠서 쓰는가의 이슈입니다. The only difference between FDD and TDD for paging takes place in. 8GHz. 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. LTE is developed to support both the time division duplex technology (TDD) as. It is a good approach for project development which are driven by user actions. . Definition. Below is the main difference between Test driven development and traditional testing: TDD approach is primarily a specification technique. China submitted the draft third-generation mobile communication standard (TD-SCDMA) in June 1997, and its TDD model and new technology of smart antennas were highly evaluated and became one of the. 5G FR (Frequency Range) / Operating Bandwidth in Detail. 3G, 4G, 5G all support both FDD and TDD. 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. TDD is the language used in test creation. - TDMA stand for Time division multiple access, it separate in time the different users. The figure depicts carrier aggregation used in LTE TDD mode frame. FDD LTE uses frequency division, while TDD LTE uses time division 2. This is where the TDD and FDD variants of LTE use a slightly different approach. To me primary difference between BDD and TDD is focus and wording. Hi! you. What is Difference between. FDMA, on the other hand, is an access method in the data link layer . 3 GHz band. 5G Frequency Bands are defined by the 3GPP, covering FDD and TDD modes, sub-6GHz and millimeter wave (mmWave) bands. g. TDD directs focus on testing. Apa beda TDD dan FDD di 4G LTE. In sub 6 Ghz, the maximum bandwidth is 100. 11 standards viz. Major Impacts If we look at it from an overall evolved packet system (EPS) architecture. Lower latency means faster response time, and vice versa. If the feature is implemented in Java, we write JUnit test cases. TDD is the abbreviated term for Test-Driven Development. See moreMobile networks take advantage of two similar, but different, forms of duplexing to send and receive data quickly and efficiently. 5ms. 1) Even i check the enable statemachine in 0x017 register ,it shows in FDD mode. This page compares TDD vs FDD and describes difference between TDD and FDD topologies. RF and Wireless TerminologiesProgrammers can write unit and functional tests using frameworks. Carrier Aggregation (FDD); The LTE-Advanced UE can be allocated DL and UL resources on the aggregated resource consisting of two or more Component Carriers (CC), the R8/R9 UEs can be allocated resources on any ONE of the CCs. Chipsets: Snapdragon X12 LTE Modem, Snapdragon 820/821 processor, Snapdragon 660 Mobile Platform, Snapdragon 630 Mobile Platform, Snapdragon 636 Mobile Platform, Snapdragon 670 Mobile Platform, Snapdragon 675 Mobile Platform, Snapdragon 665 Mobile Platform, Snapdragon 678 Mobile Platform. We could use TDD for code initial software design model.