BDD is a specification technique based on user stories and test scenarios. 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. FDD, and LTE bands between 33 & 41 are for unpaired spectrum, i. LTE is the formal name for 4G, meaning Long Term Evolution. The test scenarios in TDD is implemented using a programming language. FR1 (4. Test Driven Development, or TDD, is a process of developing software where a test is written prior to writing code. 8GHz. it is designed for high speed human data connection, and. Some standards also allow for the use of either as both FDD and TDD have their own advantages and disadvantages. . [citation needed] UMTS-TDD is not directly compatible with UMTS-FDD: a device designed to use one standard cannot, unless specifically designed to, work on the other, because of the difference in air interface technologies and frequencies used. Benefits or advantages of FDD. 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. For unpaired spectrum(TDD),In the case of differences between FDD and TDD, these differences will be explicitly indicated. In this paper resource allocation schemes for both UMTS modes (TDD and FDD) are discussed. 13 777 MHz – 787 MHz 746 MHz – 756 MHz FDD 27. Feature Driven Design has a bit of eXtreme Programming as well as a bit of Scrum but adding to them Domain Driven Design techniques. Disadvantages with TDD. Both FDD and TDD are two spectrum usage techniques, both forms of. It tests independent small units or objects to make sure each works as intended. Airtel uses the TDD-LTE technology while the Reliance is already using the 1800MHz band along with FDD-LTE technology. FDD. 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. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. 0% 20. Kanban is better suited for teams that have a lot. TDD uses an unpaired spectrum, which means that just one frequency is used for both downlink and uplink transmissions. China Telecom and China Unicom applied for the third batch of TDD/FDD hybrid networking. TDD, or time division duplex, adds the time factor in addition to isolating users with code and frequencies. FDD does this by dividing the frequency band allotted into two discrete smaller channels. FDD uses lots of frequency spectrum, though, generally at least twice the spectrum needed by TDD. Networks on LTE band 20 (LTE-FDD) are suitable for roaming in ITU Region 1 only. FR2: Frequency range is from 24250 to 52600 MHz. TDD means Time Division Duplex and FDD means Frequency Division Duplex. This is a technique in development that focuses on individual units of a feature that is desired. Apart from some smaller differences in the frame structure and mapping of some physical signals, the overall physical layer processing (e. 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. These tests are used to determine the performance of the transmitter and typically require the use of only one signal. The code is written to make the. Test First Development is slightly broader, slightly less specific, than TDD. 11 standards viz. BDD. Figure 5-10: LTE subframe structure for FDD operation, indicating subframes which should not be used for PRS. In TDD, the developers write the tests while in BDD the automated specifications are created by users or testers (with developers wiring them to the code under test. e. 5. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. 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. The greater likelihood is that a single UE or mobile will need to detect whether a TDD or FDD. 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. 3. BDD is a development technique that focuses on the system’s behavior. Testing and automation is a significant phase in traditional SDLC and Agile development methodology for software development. 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. As shown in Fig. Typically,. Test-driven development, or TDD for short, is a software development process. This paper describes the LTE technology in detail and highlights any differences between LTE TDD and LTE FDD technology. URLLCComprender los sistemas de microondas FDD vs. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM Bluetooth vs zigbee. Jeenal RambhiaUpskill and get Plac. In TDD topology, same frequency is used for both uplink and downlink directions but they use different time slots for transmissions. FDD LTE Frequency Bands Many chipsets used in modern devices can operate with either FDD or TDD, usually within specific frequency ranges. 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. Hence. This solution applies when an operator has spectrums that support both NR FDD and SUL. 예를 들어 우리나라 신문에서 모 이동통신사가 정부로부터 LTE로 20MHz를 할당받았다는 기사가. FDD stands for Frequency Division Duplex and TDD stands for Time Division Duplex. 2. Both TDD and FDD differ in the way they treat data. And this is a technique of development that is focused on the needs of the user is met. Mobile networks take advantage of two similar, but different, forms of duplexing to send and receive data quickly and efficiently. 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. These so-called guard bands aren’t useable, so they’re wasteful. Feedback-Based FDD Beamforming with Predetermined Beams Feedback-based beamforming relies on the reporting of quantized CSI from the UEs to the. Mainly developers involve in this to write Unit Tests. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. With FDD-TDD CA, Band n71 is used for the P Cell with Band n41 (100 MHz channel) serving as the S Cell. As a result, there are different LTE band allocations for TDD and FDD. Typically, T-Mobile would serve up to 110MHz, while AT&T uses around 40MHz and Verizon uses around 60MHz. LTE FDD and LTE TDD are virtually identical with the exception of a few technical charac-teristics that are specific to the Physical Layer. 531(g) PS BB, 90. Actually FDD Half-Duplex was discussed even from the initial LTE design, but hasn't gotten much attraction for a long time. e. , maximum available speed) of a 4G LTE network. . 1st Process: Developing an Overall Model. Each subframe has two slots. ) For small, co-located, developer-centric teams, TDD and BDD are effectively the. The difference between TDD and TDMA is their main goal. Differing from others, FDD modelling is a cross-functional. Time sharing of satellite transponder takes place. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Hope that helps. depeding upon the ENABLE and TXNRX pin input signal. 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. Hi! you. 2) Run all the test cases: Run these automated test cases on the currently developed code. But there is plenty of FDD spectrum currently in use so that is why. Participants. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. Below is the main difference between Test driven development and traditional testing: TDD approach is primarily a specification technique. While BDD (Behavior-Driven Development) is a team technique, TDD (Test-Driven Development) is a development practice. They were underutilized or not available for LTE. BDD directs focus on behaviour and specification, and so. There is nothing that I added myself. MAC layer in TDD system is complex. In short, TDD and Agile really focus on different aspects, and aren't mutually exclusive of one another. Abstract: We consider a bi-directional point-to-point links and study the data transmission efficiency of frequency division duplex (FDD) and TDD (T: time) schemes with a bursty communication model. Later, you will understand the Dynamics 365 CE application architecture and its extension points. BDD. FDD cenderung lebih stabil dan dapat menangani volume data yang lebih besar, sementara TDD lebih fleksibel dan dapat beradaptasi dengan perubahan yang lebih cepat dalam penggunaan jaringan. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Many chipsets used in modern devices can operate with either FDD or TDD, usually within specific frequency ranges. One subframe duration is about 1 ms. 1,283. The only difference is that TDD frames include a special subframe, part of which can be used for SRS and PRACH uplink transmissions. TDD, and what would be the main differences when compared to FDD? The majority of today's 5G deployments below 6 GHz are using TDD frequency bands already today. BDD is TDD. Upload. Time is divided up into short slots and some are designated for uplink while others are designated for downlink. The blending of these practices that resulted in a cohesive whole is the best characteristic of FDD. 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. TDD focuses on the implementation of a feature. What is Difference between. 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. There are two types of LTE Frequency Bands FDD and TDD. FDD spectrum requires pair bands, one of the uplink and one for the downlink, and TDD requires a single band as uplink and downlink are on the same frequency but time separated. OnTest-First Development. 2 Frequency Division Duplex (FDD)LTE is designed to work across a number of frequency bands – E-UTRA operating bands- currently ranging from 450 MHz up to 3. As we know FDD and TDD are popular duplexing techniques often used with multiple access schemes such as FDMA and TDMA. TDD refers to Test Driven Development. Coreset / PDSCH Mapping Type / TRS. In fact, any technology or people will not be born mature, always after some experience will mature. FDD is a technique which allows use of two separate frequency bands in uplink and downlink where as TDD is a technique which allows use of same frequency band in both uplink and downlink at different time instants or slots. FDD allows teams to update the project. e. TDD: 2500: BRS: 2496 – 2690: N/A:(in 20 MHz FDD) 50 Cat3/4 75 Cat5 2119 Cat17 13563 Cat19 (in 20 MHz FDD) LTE-Advanced Pro offers rates in excess of 3 Gbit/s to mobile users. On the other hand, CDMA has a high data rate. If the device supports full-duplex FDD (FD-FDD) operation, it can perform reception and transmission at the same time, whereas if the. The key difference between Kanban and Scrum is that Kanban is continuous, while Scrum is iterative. 2 min read. 3. The difference between ATDD and BDD is that ATDD mainly focuses on accuracy of requirements, vs. Projects that do not require involvement of end users such as server, API, etc. Popular answers (1) Emil Björnson. 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. 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]. ITU Option 2: Paired spectrum only, with the uplink portion of some pairs in another undetermined band. 1 Necessity of FDD. Type 1 is used as LTE FDD frame structure. g. However, vendors now manufacture devices which include both FDD and TDD capabilities, so in some case you may not expect the price. If LTE goes down to 1. See page 8 of UG-570). 104-5. TDD, BDD, and ATDD are some of the popular software development techniques used for automated test coverage. On the other hand, CDMA requires both guard time and guard bands. Participants. To know more about TDD vs FDD refer our article on Difference between TDD and FDD topologies. Differing from others, FDD modelling is a cross-functional. Other frameworks test that the application works on multiple versions of the targeted operating systems, different screen orientations on. TDD is often led by a sole developer and is not as collaborative as BDD, which prioritizes cross-team communication. The speeds of mobile networks are monitored by the International Telecommunication Union (ITU). Time-division duplexing (TDD) is a method for emulating full-duplex communication over a half-duplex communication link. The entire methodology of TDD focuses on a straightforward 6-step process: Writing Test Case: As per requirements, a test case with complete automation is put forward. As discussed earlier, the immediate obvious difference between TDD and ATDD is the ‘A’. 16: WirelessMAN: MIMO-SOFDMA: 37 (10 MHz TDD) 17 (10 MHz TDD) With 2x2 MIMO. When it comes to choosing between BDD and TDD for automation testing, there is no one-size-fits-all answer. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. Running Test Cases:. Refer what is 5G NR? and its features. Due to above, FDD system requires fewer base. Jul 27, 2020. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. Participants. The transmitter and receiver both use the same frequency band but transmit and receive traffic at different times. And this is a technique of development that is focused on the needs of the user is met. 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. In this paper, we compare two common modes of duplexing in wireless powered communication networks (WPCN); namely TDD and FDD. Let us understand LTE FDD and TDD LTE versions with figures and band example below. 2 Time division duplexing (TDD) TDD allows uplink and downlink to use the entire frequency spectrum, but in different time slots. Disadvantages with TDD. Examples where the two LTE modes are largely So, TDD and ATDD are levels of testing. Frequency division duplex (FDD) and time division duplex (TDD) are two different duplex modes. Hi, I am working on a HW with powered up default in FDD mode. 6-GHz spectrum, and. Despite the differences in how the two types of LTE handle data transmission, LTE-TDD and LTE-FDD share 90 percent of their core technology, making it possible for the same chipsets and networks to use both versions of LTE. e. Part 1: What do TDD and FDD stand for? TDD(Time Division Duplexing), one of the duplex technologies used in mobile communication technology. SPI control is considered asynchronous to the DATA_CLK. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM Bluetooth vs zigbee Fixed wimax vs mobile . FDD LTE is more spectrally efficient than TDD LTE, but TDD LTE has a lower latency. Despite actually running into the 7 GHz band, FR1 continues to be commonly referred to as the "Sub-6 GHz" band. 3 GHz band. Each subframe has two slots. Both FDD and TDD are two spectrum usage. solution requires co-site deployment of NR TDD and NR FDD base stations [7]. به طور کلی FDD همانند سیستم GSM استفاده ی گسترده ای در سیستم تلفن های سلولی دارد. TDD. And since in "old waterfall world" tests come after implementation, then this mindset leads to wrong understanding and behaviour. Summary: 1. View ABC (7). * In TDD, both the transmitter and receiver operate on the same frequency but at different times. 2 FR2). Compared to TDD, it is difficult to track them down. There are two types of LTE Frequency Bands FDD and TDD. Figure 1. 1, although the exact parameters are different. FDD in Agile encourages status reporting at all levels, which helps to track progress and results. 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. 10 such subframes form one radio frame. ). Guard time between adjacent slots is necessary. 1,410. FDD needs two bands while TDD needs only one. e. 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. RF and Wireless TerminologiesThe operator used equipment supplied by Huawei to aggregate an FDD carrier in either of the 1800 MHz or 2. It provides a wide coverage area because it has a lower frequency. In contrast to those, the "SYSTEM Design Document" describes an entire system, which could be a high-level view of the components within a given application, or all the applications within a given system (e. The first generation of 5G modems and mobile devices only support the TDD mode for FR1. The test is then used to create and refactor code unto the code passes the tests. This page covers advantages and disadvantages of TDD and FDD . LTE was designed to work equally well in time-division duplex (TDD) and frequency division duplex (FDD) mode, so that operators could choose their mode of operation. 2. 5ms duration. FDMA only requires the guard bands between adjacent channels, whereas TDMA requires the guard time of the adjacent slots. subframes. To know more about TDD vs FDD refer our article on Difference between TDD and FDD topologies. The basic structure of these TDD NPRACH formats is the same as that of FDD formats described in Section 7. KTH Royal Institute of Technology. D. What is Difference between. Suitability. 3. So, it is very important to understand the slot structure and other details about slot-based scheduling etc. 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. 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. 11 standards viz. Extended Time Division Multiple. Editorial Team - everything RF. In addition, there must be adequate spectrum separation between the transmit and receive channels. [1] ^ Frequency-division duplexing (FDD); time-division duplexing (TDD); FDD supplemental downlink (SDL) ^ User Equipment transmit; Base Station receive ^ User. 2. . The performance of the duplex technologies in URLLC to assist in meeting the needs of low-latency services is of great significance. This should be the only change you have to. difference between FDM and OFDM Difference between SC-FDMA and OFDM Difference between SISO and MIMO Difference between TDD and FDD Difference between 802. 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. , TDD 28 GHz Outdoor macro and small cell e. 275000 - 28350 MHz. B. 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. pdf from BIOLOGY 2108 at Addis Ababa University. 11 standards viz. BDDs are written in Natural language The basics. cc86 on Jan 30, 2015. 3) Test’s Quality in TDD: Test used in TDD have different purpose and intent than tests written to check software quality. The packages are separated by a small amount of time. 1. 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. 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. With this configuration, greater Band n41 coverage was documented as well as instances of. 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. , unlicensed 6 GHz mmWave e. 11 standards viz. BDD is a good approach to go here. RF and Wireless Terminologieslte carrier aggregation. e. While these philosophies all imbibe the classic agile principles of an incremental and iterative mindset to software development, they subtly differ from each other. The principal difference in ATDD vs. Furthermore, the TDD mode, also known as TD-LTE, is designed with coexistence between TD-LTE and TD-SCDMA in mind to simplify a gradual migration from TD-SCDMA to TD-LTE. Disadvantages with TDD. The whole book is trying to explain it by patterns, workflows, culture and so forth. Tanto FDD como TDD son. Abstract: We analyze the achievable rates of time division duplex (TDD) and frequency division duplex (FDD) operations in massive MIMO systems depending on the coherence time and bandwidth of the underlying channel. Figure 1 shows a TDMA/TDD frame structure. 02. To know in-depth difference between both of these terms refer following links. 4G Contribution Telecom Technology There is a saying that FDD technology should be mature in TDD technology. FDD-LTE používá samostatná frekvenční pásma pro uplink a downlink datový přenos, zatímco TDD-LTE používá stejné frekvenční pásmo se střídajícími se časovými. 5G NR frequency bands. 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. Due to above, FDD system requires fewer base. . Developers, QAs and Customers involve in this process. This is what I meant by saying that BDD eliminates issues that TDD might cause. 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. Collaboration is the key for BDD to be successful. The difference between TDD and TDMA is their main goal. It is designed for symmetric traffic and do not require guard time like TDD. propagation delays considering FDD and TDD duplexing mode. Given the scarcity and expense of spectrum, these are real disadvantages. 3. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. As a document and you can name as any of the mentioned. Carrier Aggregation in TDD. TDD, on the other hand, can work with unpaired spectrum, but FDD requires paired spectrum. DDDDDDDSUU is the frame structure used in case of coexistence for synchronisation between 4G TDD and 5G TDD. FDD uses lots of frequency spectrum, though, generally at least twice the spectrum needed by 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. But there are many key differences between these standards, and below are some of the prominent ones. With traditional testing, a successful test finds one or more defects. 5. 19 17 704 MHz – 716 MHz 734 MHz – 746 MHz FDD 27. Link to the detailed post on FDD and TDD: = Frequency Division DuplexTDD = Time. FDD needs two bands while TDD needs only one. Difference between LTE FDD vs TDD LTE. What is Difference between. As the name implies, involves utilizing tests to guide application development, resulting in simple, iterative implementation with good test coverage right from the start. 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. 11 standards. 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. 5–1 in 3GPP TS 36. - TDD stand for Time division duplexing, It separate in time the downstream and upstream directions of the traffic. FDD-LTE utilizes paired spectrum blocks for uplink and downlink communication, while TDD-LTE uses a single frequency band for uplink and downlink. 1UL(TDD): PC1. 1. TDD and FDD are two topologies by which critical resources time and frequency are shared among mobile subscribers or terminals. This is a technique of development that focuses on the behavior that is expected. TDD, and what would be the main differences when compared to FDD? The majority of today's 5G deployments below 6 GHz are using TDD frequency bands already today. 2 Time-Division Duplexing. 3 Answers. FDMA stands for Frequency Division Multiple Access. TDD is the winner in this case. "Seamless handover between FDD-LTE and TDD-LTE networks is a critical feature. What is Difference between. TDD. TDD is a duplex method of communication systems that is used in mobile communication systems to separate receiving and transmitting channels. The main difference between FDD and TDD lies in the use of different duplex modes. While descriptions are simple and straightforward, the actual code might be complex. FDD in Agile encourages status reporting at all levels, which helps to track progress and results. Test driven Development is a technique in which automated Unit test are used to drive the design and free decoupling of dependencies. Major Impacts If we look at it from an overall evolved packet system (EPS) architecture. Each approach caters to a different need. 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. For UE with 2Tx (transmit channels) in uplink, with the introduction of. . RF and Wireless TerminologiesThen comes the 5G mini-slot concept. What is Difference between. Factors such as the project's size, complexity, domain, and lifecycle; the stakeholders. In the case of differences between FDD and TDD, these differences are explicitly indicated. TDD is the abbreviated term for Test-Driven Development. 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. Tdd Versus Fdd. BDD primarily focuses on user behavior. This page compares 5G FDD vs 5G TDD and describes difference between FDD and TDD in 5G wireless network. 11-a,11-b,11-g and 11-n OFDM vs OFDMA CDMA vs GSM. TDD and FDD are two topologies by which critical resources time and frequency are shared among mobile subscribers or terminals. Frequency division duplex (FDD) and time division duplex (TDD) are two. Factors such as the project's size, complexity, domain, and lifecycle; the stakeholders. FDMA also supports demand assignment in addition to fixed assignment. Here language is used is similar to the one used for feature development like programming language. What is Difference between.