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39-449: For the telecom, see Tricom, S.A . In 2008, Tricom was the first Australian broking house in many years to fail to settle its trades with the ASX . Controversially, it held ownership of shares that its borrowers had used margin loans to purchase until the loan was repaid. Tricom would then lend those shares to other traders so that they could be sold, as

78-464: A Belgian company, has also worked to build small cells for LTE-TDD networks. Trials of LTE-TDD technology began as early as 2010, with Reliance Industries and Ericsson India conducting field tests of LTE-TDD in India , achieving 80 megabit-per second download speeds and 20 megabit-per-second upload speeds. By 2011, China Mobile began trials of the technology in six cities. Although initially seen as

117-422: A build out of a 4G-LTE network. On March 13, 2013, Tricom launched a video on demand service, becoming the second Dominican provider after Claro República Dominicana to offer a VOD service. On March 18, 2013, Tricom launched their 4G-LTE network and became the second Dominican provider after Orange to offer LTE for modems. On May 2, 2013, Tricom launched their LTE network for mobile phones, becoming

156-411: A coalition of international companies that worked to develop and test the technology. China Mobile was an early proponent of LTE-TDD, along with other companies like Datang Telecom and Huawei , which worked to deploy LTE-TDD networks, and later developed technology allowing LTE-TDD equipment to operate in white spaces —frequency spectra between broadcast TV stations. Intel also participated in

195-618: A combined LTE-TDD and LTE-FDD network in Poland, and by April 2012, ZTE Corporation had worked to deploy trial or commercial LTE-TDD networks for 33 operators in 19 countries. In late 2012, Qualcomm worked extensively to deploy a commercial LTE-TDD network in India, and partnered with Bharti Airtel and Huawei to develop the first multi-mode LTE-TDD smartphone for India. In Japan , SoftBank Mobile launched LTE-TDD services in February 2012 under

234-575: A form of short selling . References [ edit ] ^ Tricom late again - ASX moves in | smh.com.au Archived 2008-03-06 at the Wayback Machine Retrieved from " https://en.wikipedia.org/w/index.php?title=Tricom&oldid=849483038 " Category : Defunct financial services companies of Australia Hidden category: Webarchive template wayback links Tricom, S.A In 1988, Zona Franca de San Isidro spawned San Isidro Teleport, which

273-405: A massive installation of residential lines. Following is the implementation of pagers, paging services, and mobile products. In 1995 the first long-distance prepaid card, "Efectiva", was made public. In 1996, Tricom implemented Motorola's Digital Telephone services which allowed the installation of residential and business lines in just 48 hours. Amigo, the country's first prepaid wireless provider,

312-485: A number of carriers promoting VoLGA (Voice over LTE Generic Access) as an interim solution. The idea was to use the same principles as GAN (Generic Access Network, also known as UMA or Unlicensed Mobile Access), which defines the protocols through which a mobile handset can perform voice calls over a customer's private Internet connection, usually over wireless LAN. VoLGA however never gained much support, because VoLTE ( IMS ) promises much more flexible services, albeit at

351-545: A registered trademark owned by ETSI (European Telecommunications Standards Institute) for the wireless data communications technology and a development of the GSM/UMTS standards. However, other nations and companies do play an active role in the LTE project. The goal of LTE was to increase the capacity and speed of wireless data networks using new DSP (digital signal processing) techniques and modulations that were developed around

390-460: A series of tests of voice over LTE ( VoLTE) calls on China Mobile's TD-LTE network. The next month, Nokia Solutions and Networks and Sprint announced that they had demonstrated throughput speeds of 2.6 gigabits per second using a LTE-TDD network, surpassing the previous record of 1.6 gigabits per second. Much of the LTE standard addresses the upgrading of 3G UMTS to what will eventually be 4G mobile communications technology. A large amount of

429-693: A technology utilized by only a few countries, including China and India, by 2011 international interest in LTE-TDD had expanded, especially in Asia, in part due to LTE-TDD's lower cost of deployment compared to LTE-FDD. By the middle of that year, 26 networks around the world were conducting trials of the technology. The Global LTve (GTI) was also started in 2011, with founding partners China Mobile, Bharti Airtel , SoftBank Mobile , Vodafone , Clearwire , Aero2 and E-Plus . In September 2011, Huawei announced it would partner with Polish mobile provider Aero2 to develop

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468-508: A transfer latency of less than 5  ms in the radio access network . LTE has the ability to manage fast-moving mobiles and supports multi-cast and broadcast streams. LTE supports scalable carrier bandwidths , from 1.4  MHz to 20 MHz and supports both frequency division duplexing (FDD) and time-division duplexing (TDD). The IP-based network architecture, called the Evolved Packet Core (EPC) designed to replace

507-481: A voice call on a non-VoLTE-enabled network or device, LTE handsets will fall back to old 2G or 3G networks for the duration of the call. To ensure compatibility, 3GPP demands at least AMR-NB codec (narrow band), but the recommended speech codec for VoLTE is Adaptive Multi-Rate Wideband , also known as HD Voice . This codec is mandated in 3GPP networks that support 16 kHz sampling. Fraunhofer IIS has proposed and demonstrated "Full-HD Voice", an implementation of

546-622: Is a list of top 10 countries/territories by 4G LTE coverage as measured by OpenSignal.com in February/March 2019. For the complete list of all the countries/territories, see list of countries by 4G LTE penetration . Long-Term Evolution Time-Division Duplex ( LTE-TDD ), also referred to as TDD LTE , is a 4G telecommunications technology and standard co-developed by an international coalition of companies, including China Mobile , Datang Telecom , Huawei , ZTE , Nokia Solutions and Networks , Qualcomm , Samsung , and ST-Ericsson . It

585-578: Is also called 3.95G and has been marketed as 4G LTE and Advanced 4G ; but the original version did not meet the technical criteria of a 4G wireless service, as specified in the 3GPP Release 8 and 9 document series for LTE Advanced . The requirements were set forth by the ITU-R organisation in the IMT Advanced specification; but, because of market pressure and the significant advances that WiMAX , Evolved High Speed Packet Access , and LTE bring to

624-708: Is generally cheaper to access, and has less traffic. Further, the bands for LTE-TDD overlap with those used for WiMAX , which can easily be upgraded to support LTE-TDD. 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. A number of companies produce dual-mode chips or mobile devices, including Samsung and Qualcomm , while operators CMHK and Hi3G Access have developed dual-mode networks in Hong Kong and Sweden, respectively. The creation of LTE-TDD involved

663-630: Is launched in 1997. Meanwhile, TRICOM USA is created to offer long-distance services to the Hispanic community in New York City . In 1998, Tricom placed 5,700,000 shares of common stock in the New York Stock Exchange (NYSE) , becoming the first Dominican company to be listed in the U.S. stock market. In 1999, the company achieved 300,000 customers, becoming the leader in mobile communications in addition to servicing 68% of

702-495: Is one of the two mobile data transmission technologies of the Long-Term Evolution (LTE) technology standard, the other being Long-Term Evolution Frequency-Division Duplex ( LTE-FDD ). While some companies refer to LTE-TDD as "TD-LTE" for familiarity with TD-SCDMA , there is no reference to that abbreviation anywhere in the 3GPP specifications. There are two major differences between LTE-TDD and LTE-FDD: how data

741-465: Is the upgrade path for carriers with both GSM/UMTS networks and CDMA2000 networks. Because LTE frequencies and bands differ from country to country, only multi-band phones can use LTE in all countries where it is supported. The standard is developed by the 3GPP (3rd Generation Partnership Project) and is specified in its Release 8 document series, with minor enhancements described in Release 9. LTE

780-703: Is uploaded and downloaded, and what frequency spectra the networks are deployed in. 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 ratio between uploads and downloads on a LTE-TDD network can be changed dynamically, depending on whether more data needs to be sent or received. LTE-TDD and LTE-FDD also operate on different frequency bands, with LTE-TDD working better at higher frequencies, and LTE-FDD working better at lower frequencies. Frequencies used for LTE-TDD range from 1850 MHz to 3800 MHz, with several different bands being used. The LTE-TDD spectrum

819-459: The AAC-ELD (Advanced Audio Coding – Enhanced Low Delay) codec for LTE handsets. Where previous cell phone voice codecs only supported frequencies up to 3.5 kHz and upcoming wideband audio services branded as HD Voice up to 7 kHz, Full-HD Voice supports the entire bandwidth range from 20 Hz to 20 kHz. For end-to-end Full-HD Voice calls to succeed, however, both

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858-598: The COFDM radio access technique to replace the CDMA and studying its Terrestrial use in the L band at 1428 MHz (TE) In 2004 by Japan's NTT Docomo , with studies on the standard officially commenced in 2005. In May 2007, the LTE/ SAE Trial Initiative (LSTI) alliance was founded as a global collaboration between vendors and operators with the goal of verifying and promoting the new standard in order to ensure

897-586: The GPRS Core Network , supports seamless handovers for both voice and data to cell towers with older network technology such as GSM , UMTS and CDMA2000 . The simpler architecture results in lower operating costs (for example, each E-UTRA cell will support up to four times the data and voice capacity supported by HSPA ). Most carriers supporting GSM or HSUPA networks can be expected to upgrade their networks to LTE at some stage. A complete list of commercial contracts can be found at: The following

936-521: The Altice name as their brand for their services. 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. It improves on those standards' capacity and speed by using a different radio interface and core network improvements. LTE

975-865: The United States, Bell and Telus in Canada, au by KDDI in Japan, SK Telecom in South Korea and China Telecom / China Unicom in China) have announced instead they intend to migrate to LTE. The next version of LTE is LTE Advanced , which was standardized in March 2011. Services commenced in 2013. Additional evolution known as LTE Advanced Pro have been approved in year 2015. The LTE specification provides downlink peak rates of 300 Mbit/s, uplink peak rates of 75 Mbit/s and QoS provisions permitting

1014-494: The adoption of LTE, carriers will have to re-engineer their voice call network. Four different approaches sprang up: One additional approach which is not initiated by operators is the usage of over-the-top content (OTT) services, using applications like Skype and Google Talk to provide LTE voice service. Most major backers of LTE preferred and promoted VoLTE from the beginning. The lack of software support in initial LTE devices, as well as core network devices, however led to

1053-678: The caller and recipient's handsets, as well as networks, have to support the feature. The LTE standard covers a range of many different bands, each of which is designated by both a frequency and a band number: As a result, phones from one country may not work in other countries. Users will need a multi-band capable phone for roaming internationally. According to the European Telecommunications Standards Institute 's (ETSI) intellectual property rights (IPR) database, about 50 companies have declared, as of March 2012, holding essential patents covering

1092-715: The carrier began using these frequencies for LTE service on networks built by Samsung , Alcatel-Lucent , and Nokia . As of March 2013, 156 commercial 4G LTE networks existed, including 142 LTE-FDD networks and 14 LTE-TDD networks. As of November 2013, the South Korean government planned to allow a fourth wireless carrier in 2014, which would provide LTE-TDD services, and in December 2013, LTE-TDD licenses were granted to China's three mobile operators, allowing commercial deployment of 4G LTE services. In January 2014, Nokia Solutions and Networks indicated that it had completed

1131-413: The cost of having to upgrade the entire voice call infrastructure. VoLTE may require Single Radio Voice Call Continuity (SRVCC) in order to be able to smoothly perform a handover to a 2G or 3G network in case of poor LTE signal quality. While the industry has standardized on VoLTE, early LTE deployments required carriers to introduce circuit-switched fallback as a stopgap measure. When placing or receiving

1170-466: The country's landlines. In 2004, the company was de-listed from the NYSE . On June 5, 2012, Tricom announced their intent to begin a buildout of a Hybrid fibre-coaxial network across Bayahibe , Bonao , Casa de Campo , La Romana , La Vega , San Cristóbal , San Francisco de Macorís , San Pedro de Macorís , Santiago , and Santo Domingo . On July 4, 2012, Tricom announced they were going to begin

1209-482: The development, setting up a LTE-TDD interoperability lab with Huawei in China, as well as ST-Ericsson , Nokia, and Nokia Siemens (now Nokia Solutions and Networks ), which developed LTE-TDD base stations that increased capacity by 80 percent and coverage by 40 percent. Qualcomm also participated, developing the world's first multi-mode chip, combining both LTE-TDD and LTE-FDD, along with HSPA and EV-DO. Accelleran,

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1248-462: The first Dominican provider to offer LTE for mobiles. On November 27, 2013, Orange sold its Dominican unit to Tricom's Parent company, Altice, for US$ 1.435 billion. The merger was approved and finalized on November 21, 2017, with the Orange and Tricom brand names permanently retired and both of Tricom's and Orange's Cellular networks integrated to Altice's own cellular network. The company began using

1287-605: The global introduction of the technology as quickly as possible. The LTE standard was finalized in December 2008, and the first publicly available LTE service was launched by TeliaSonera in Oslo and Stockholm on December 14, 2009, as a data connection with a USB modem. The LTE services were launched by major North American carriers as well, with the Samsung SCH-r900 being the world's first LTE Mobile phone starting on September 21, 2010, and Samsung Galaxy Indulge being

1326-497: The name Advanced eXtended Global Platform (AXGP), and marketed as SoftBank 4G ( ja ). The AXGP band was previously used for Willcom 's PHS service, and after PHS was discontinued in 2010 the PHS band was re-purposed for AXGP service. In the U.S., Clearwire planned to implement LTE-TDD, with chip-maker Qualcomm agreeing to support Clearwire's frequencies on its multi-mode LTE chipsets. With Sprint's acquisition of Clearwire in 2013,

1365-452: The original 3G technologies, ITU-R later decided that LTE and the aforementioned technologies can be called 4G technologies. The LTE Advanced standard formally satisfies the ITU-R requirements for being considered IMT-Advanced. To differentiate LTE Advanced and WiMAX-Advanced from current 4G technologies, ITU has defined the latter as "True 4G". LTE stands for Long-Term Evolution and is

1404-407: The turn of the millennium. A further goal was the redesign and simplification of the network architecture to an IP -based system with significantly reduced transfer latency compared with the 3G architecture. The LTE wireless interface is incompatible with 2G and 3G networks, so that it must be operated on a separate radio spectrum . The idea of LTE was first proposed in 1998, with the use of

1443-450: The work is aimed at simplifying the architecture of the system, as it transitions from the existing UMTS circuit + packet switching combined network, to an all-IP flat architecture system. E-UTRA is the air interface of LTE. Its main features are: The LTE standard supports only packet switching with its all-IP network. Voice calls in GSM, UMTS and CDMA2000 are circuit switched , so with

1482-772: The world's first LTE smartphone starting on February 10, 2011, both offered by MetroPCS , and the HTC ThunderBolt offered by Verizon starting on March 17 being the second LTE smartphone to be sold commercially. In Canada, Rogers Wireless was the first to launch LTE network on July 7, 2011, offering the Sierra Wireless AirCard 313U USB mobile broadband modem, known as the "LTE Rocket stick" then followed closely by mobile devices from both HTC and Samsung. Initially, CDMA operators planned to upgrade to rival standards called UMB and WiMAX , but major CDMA operators (such as Verizon , Sprint and MetroPCS in

1521-582: Was later renamed Tricom. In 1990, the company had reached an agreement with the Dominican Republic to provide communications services nationwide. On May 20, 1992, the company began to implement "Long Distance Call Centers", entering the business of international long-distance services. In 1993, Tricom sold Motorola a 40% stake in the company with a goal of improving their local and international infrastructure. On November 17, 1994, Tricom and CODETEL connected their telephone exchanges, allowing

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