Intelecommunications,long-term evolution (LTE) is astandard forwireless broadband communication forcellular mobile devices and data terminals. It is considered to be a "transitional"4G technology,[1] and is therefore also referred to as3.95G as a step above3G.[2]
LTE is based on the2GGSM/EDGE and 3GUMTS/HSPA standards. It improves on those standards' capacity and speed by using a different radio interface and core network improvements.[3][4] LTE is the upgrade path for carriers with both GSM/UMTS networks andCDMA2000 networks. LTE has been succeeded byLTE Advanced, which is officially defined as a "true" 4G technology[5] and also named "LTE+".
The standard is developed by the3GPP (3rd Generation Partnership Project) and is specified in its Release 8 document series, with minor enhancements described in Release 9. LTE is also called3.95G and has been marketed as4G LTE andAdvanced 4G;[citation needed] but the original version did not meet the technical criteria of a4G wireless service, as specified in the 3GPP Release 8 and 9 document series forLTE Advanced. The requirements were set forth by theITU-R organisation in theIMT Advanced specification; but, because of market pressure and the significant advances thatWiMAX,Evolved High Speed Packet Access, and LTE bring to the original 3G technologies, ITU-R later decided that LTE and the aforementioned technologies can be called 4G technologies.[6] The LTE Advanced standard formally satisfies the ITU-R requirements for being considered IMT-Advanced.[7] To differentiate LTE Advanced andWiMAX-Advanced from current[when?] 4G technologies, ITU has defined the latter as "True 4G".[8][5]
3GPP logo of LTEAn Android phone showing LTE connectionLTE modem4G+ modemLTE and VoLTE logos on an Samsung Galaxy S21+ running One UI 6.1HTC ThunderBolt, the second commercially available LTE smartphone
LTE stands for Long-Term Evolution[9] and is a registered trademark owned byETSI (European Telecommunications Standards Institute) for the wirelessdata communications technology and 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 newDSP (digital signal processing) techniques and modulations that were developed around the turn of the millennium. A further goal was the redesign and simplification of thenetwork architecture to anIP-based system with significantly reduced transferlatency compared with the3G architecture. The LTE wireless interface is incompatible with2G and 3G networks so it must be operated on a separateradio spectrum.
The idea of LTE was first proposed in 1998, with the use of theCOFDM radio access technique to replace theCDMA and studying its Terrestrial use in the L band at 1428 MHz (TE)In 2004 by Japan'sNTT Docomo, with studies on the standard officially commenced in 2005.[10] 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 the global introduction of the technology as quickly as possible.[11][12]
The LTE standard was finalized in December 2008, and the first publicly available LTE service was launched byTeliaSonera inOslo andStockholm 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,[13][14] and Samsung Galaxy Indulge being the world's first LTE smartphone starting on February 10, 2011,[15][16] both offered byMetroPCS, and theHTC ThunderBolt offered by Verizon starting on March 17 being the second LTE smartphone to be sold commercially.[17][18] 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.[19] Initially, CDMA operators planned to upgrade to rival standards calledUMB andWiMAX, but major CDMA operators (such asVerizon,Sprint andMetroPCS in the United States,Bell andTelus in Canada,au by KDDI in Japan,SK Telecom in South Korea andChina Telecom/China Unicom in China) have announced instead they intend to migrate to LTE. The next version of LTE isLTE Advanced, which was standardized in March 2011.[20] Services commenced in 2013.[21] Additional evolution known asLTE Advanced Pro have been approved in year 2015.[22]
The LTE specification provides downlink peak rates of 300 Mbit/s, uplink peak rates of 75 Mbit/s andQoS provisions permitting a transferlatency of less than 5 ms in theradio access network. LTE has the ability to manage fast-moving mobiles and supports multi-cast and broadcast streams. LTE supports scalable carrierbandwidths, from 1.4 MHz to 20 MHz and supports bothfrequency division duplexing (FDD) andtime-division duplexing (TDD). The IP-based network architecture, called theEvolved Packet Core (EPC) designed to replace theGPRS Core Network, supports seamlesshandovers for both voice and data to cell towers with older network technology such asGSM,UMTS andCDMA2000.[23] The simpler architecture results in lower operating costs (for example, eachE-UTRA cell will support up to four times the data and voice capacity supported by HSPA[24]).
BecauseLTE frequencies and bands differ from country to country, only multi-band phones can use LTE in all countries where it is supported.
In September 2006, Siemens Networks (todayNokia Networks) showed in collaboration with Nomor Research the first live emulation of an LTE network to the media and investors. As live applications, two users streaming anHDTV video in the downlink and playing an interactive game in the uplink have been demonstrated.[26]
In February 2007,Ericsson demonstrated for the first time in the world, LTE with bit rates up to 144 Mbit/s[27]
In September 2007,NTT Docomo demonstrated LTE data rates of 200 Mbit/s with power level below 100 mW during the test.[28]
In November 2007,Infineon presented the world's first RF transceiver named SMARTi LTE supporting LTE functionality in a single-chip RF silicon processed in CMOS[29][30]
In early 2008, LTE test equipment began shipping from several vendors and, at theMobile World Congress 2008 inBarcelona,Ericsson demonstrated the world's first end-to-end mobile call enabled by LTE on a small handheld device.[31]Motorola demonstrated an LTE RAN standard complianteNodeB and LTEchipset at the same event.
Motorola demonstrated how LTE can accelerate the delivery of personal media experience with HD video demo streaming, HD video blogging, Online gaming, and VoIP over LTE running a RAN standard-compliant LTE network & LTE chipset.[32]
Ericsson EMP (laterST-Ericsson) demonstrated the world's first end-to-end LTE call on handheld[31] Ericsson demonstrated LTE FDD and TDD mode on the same base station platform.
Freescale Semiconductor demonstrated streaming HD video with peak data rates of 96 Mbit/s downlink and 86 Mbit/s uplink.[33]
picoChip and Mimoon demonstrated a base station reference design. This runs on a common hardware platform (multi-mode /software-defined radio) with their WiMAX architecture.[35]
In April 2008, Motorola demonstrated the first EV-DO to LTE hand-off – handing over a streaming video from LTE to a commercial EV-DO network and back to LTE.[36]
In April 2008,LG Electronics andNortel demonstrated LTE data rates of 50 Mbit/s while travelling at 110 km/h (68 mph).[37]
In November 2008,Motorola demonstrated industry first over-the-air LTE session in 700 MHz spectrum.[38]
Launch of ng Connect program, a multi-industry consortium founded byAlcatel-Lucent to identify and develop wireless broadband applications.[41]
Motorola provided LTE drive tour on the streets of Barcelona to demonstrate LTE system performance in a real-life metropolitan RF environment[42]
In July 2009, Nujira demonstrated efficiencies of more than 60% for an 880 MHz LTE Power Amplifier[43]
In August 2009,Nortel andLG Electronics demonstrated the first successful handoff between CDMA and LTE networks in a standards-compliant manner[44]
In August 2009,Alcatel-Lucent receives FCC certification for LTE base stations for the 700 MHz spectrum band.[45]
In September 2009,Nokia Siemens Networks demonstrated the world's first LTE call on standards-compliant commercial software.[46]
In October 2009,Ericsson andSamsung demonstrated interoperability between the first ever commercial LTE device and the live network in Stockholm, Sweden.[47]
In October 2009,Alcatel-Lucent's Bell Labs, DeutscheTelekom Innovation Laboratories, the Fraunhofer Heinrich-Hertz Institut, and antenna supplier Kathrein conducted live field tests of a technology called Coordinated Multipoint Transmission (CoMP) aimed at increasing the data transmission speeds of LTE and 3G networks.[48]
In November 2009,Alcatel-Lucent completed first live LTE call using 800 MHz spectrum band set aside as part of the EuropeanDigital Dividend (EDD).[49]
On December 14, 2009, the first commercial LTE deployment was in the Scandinavian capitalsStockholm andOslo by the Swedish-Finnish network operatorTeliaSonera and its Norwegian brandnameNetCom (Norway). TeliaSonera incorrectly branded the network "4G". The modem devices on offer were manufactured bySamsung (dongle GT-B3710), and the network infrastructure withSingleRAN technology created byHuawei (in Oslo)[51] andEricsson (in Stockholm). TeliaSonera plans to roll out nationwide LTE across Sweden, Norway and Finland.[52] TeliaSonera used spectral bandwidth of 10 MHz (out of the maximum 20 MHz), andSingle-Input and Single-Output transmission. The deployment should have provided a physical layernet bit rates of up to 50 Mbit/s downlink and 25 Mbit/s in the uplink. Introductory tests showed aTCPgoodput of 42.8 Mbit/s downlink and 5.3 Mbit/s uplink in Stockholm.[53]
In December 2009,ST-Ericsson andEricsson first to achieve LTE and HSPA mobility with a multimode device.[54]
In January 2010,Alcatel-Lucent andLG complete a live handoff of an end-to-end data call between LTE and CDMA networks.[55]
In May 2010,Mobile TeleSystems (MTS) andHuawei showed an indoor LTE network at "Sviaz-Expocomm 2010" in Moscow, Russia.[57] MTS expects to start a trial LTE service in Moscow by the beginning of 2011. Earlier, MTS has received a license to build an LTE network in Uzbekistan and intends to commence a test LTE network in Ukraine in partnership withAlcatel-Lucent.
At the ShanghaiExpo 2010 in May 2010,Motorola demonstrated a live LTE in conjunction withChina Mobile. This included video streams and a drive test system using TD-LTE.[58]
As of 12/10/2010,DirecTV has teamed up with Verizon Wireless for a test of high-speed LTE wireless technology in a few homes in Pennsylvania, designed to deliver an integrated Internet and TV bundle. Verizon Wireless said it launched LTE wireless services (for data, no voice) in 38 markets where more than 110 million Americans live on Sunday, Dec. 5.[59]
On May 6, 2011,Sri Lanka Telecom Mobitel demonstrated4G LTE for the first time in South Asia, achieving a data rate of 96 Mbit/s in Sri Lanka.[60]
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:[61]
August 2009:Telefónica selected six countries to field-test LTE in the succeeding months: Spain, the United Kingdom, Germany and the Czech Republic in Europe, and Brazil and Argentina in Latin America.[62]
On November 24, 2009:Telecom Italia announced the first outdoor pre-commercial experimentation in the world, deployed inTorino and totally integrated into the 2G/3G network currently in service.[63]
On December 14, 2009, the world's first publicly available LTE service was opened byTeliaSonera in the two Scandinavian capitalsStockholm andOslo.
On May 28, 2010, Russian operator Scartel announced the launch of an LTE network inKazan by the end of 2010.[64]
On October 6, 2010, Canadian providerRogers Communications Inc announced that Ottawa, Canada's national capital, would be the site of LTE trials. Rogers said it will expand on this testing and move to a comprehensive technical trial of LTE on both low- and high-band frequencies across the Ottawa area.[65]
On May 6, 2011, Sri Lanka Telecom Mobitel successfully demonstrated 4G LTE for the first time in South Asia, achieving a data rate of 96 Mbit/s in Sri Lanka.[66]
On May 7, 2011, Sri Lankan Mobile OperatorDialog Axiata PLC switched on the first pilot 4G LTE Network in South Asia with vendor partnerHuawei and demonstrated a download data speed up to 127 Mbit/s.[67]
On February 9, 2012,Telus Mobility launched their LTE service initial in metropolitan areas include Vancouver, Calgary, Edmonton, Toronto and the Greater Toronto Area, Kitchener, Waterloo, Hamilton, Guelph, Belleville, Ottawa, Montreal, Québec City, Halifax andYellowknife.[68]
Telus Mobility has announced that it will adopt LTE as its 4G wireless standard.[69]
Cox Communications has its first tower for wireless LTE network build-out.[70] Wireless services launched in late 2009.
In March 2019, theGlobal Mobile Suppliers Association reported that there were now 717 operators with commercially launched LTE networks (broadband fixed wireless access and or mobile).[71]
The following is a list of the top 10 countries/territories by 4G LTE coverage as measured by OpenSignal.com in February/March 2019.[72][73]
Long-Term Evolution Time-Division Duplex (LTE-TDD), also referred to asTDD LTE, is a4G telecommunications technology and standard co-developed by an international coalition of companies, includingChina Mobile,Datang Telecom,Huawei,ZTE,Nokia Solutions and Networks,Qualcomm,Samsung, andST-Ericsson. It is one of the two mobile data transmission technologies of the Long-Term Evolution (LTE) technology standard, the other beingLong-Term Evolution Frequency-Division Duplex (LTE-FDD). While some companies refer to LTE-TDD as "TD-LTE" for familiarity withTD-SCDMA, there is no reference to that abbreviation anywhere in the 3GPP specifications.[74][75][76]
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. While LTE-FDD uses paired frequencies to upload and download data,[77] LTE-TDD uses a single frequency, alternating between uploading and downloading data through time.[78][79] 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.[80] LTE-TDD and LTE-FDD also operate on different frequency bands,[81] with LTE-TDD working better at higher frequencies, and LTE-FDD working better at lower frequencies.[82] Frequencies used for LTE-TDD range from 1850 MHz to 3800 MHz, with several different bands being used.[83] The LTE-TDD spectrum is generally cheaper to access, and has less traffic.[81] Further, the bands for LTE-TDD overlap with those used forWiMAX, which can easily be upgraded to support LTE-TDD.[81]
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.[81][84] A number of companies produce dual-mode chips or mobile devices, includingSamsung andQualcomm,[85][86] while operatorsCMHK and Hi3G Access have developed dual-mode networks in Hong Kong and Sweden, respectively.[87]
The creation of LTE-TDD involved a coalition of international companies that worked to develop and test the technology.[88]China Mobile was an early proponent of LTE-TDD,[81][89] along with other companies likeDatang Telecom[88] andHuawei, which worked to deploy LTE-TDD networks, and later developed technology allowing LTE-TDD equipment to operate inwhite spaces—frequency spectra between broadcast TV stations.[75][90]Intel also participated in the development, setting up a LTE-TDD interoperability lab with Huawei in China,[91] as well asST-Ericsson,[81] Nokia,[81] and Nokia Siemens (nowNokia Solutions and Networks),[75] which developed LTE-TDD base stations that increased capacity by 80 percent and coverage by 40 percent.[92]Qualcomm also participated, developing the world's first multi-mode chip, combining both LTE-TDD and LTE-FDD, along with HSPA and EV-DO.[86] Accelleran, a Belgian company, has also worked to build small cells for LTE-TDD networks.[93]
Trials of LTE-TDD technology began as early as 2010, withReliance Industries and Ericsson India conducting field tests of LTE-TDD inIndia, achieving 80 megabit-per second download speeds and 20 megabit-per-second upload speeds.[94] By 2011, China Mobile began trials of the technology in six cities.[75]
Although initially seen as a technology utilized by only a few countries, including China and India,[95] 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.[75] By the middle of that year, 26 networks around the world were conducting trials of the technology.[76] The Global LTve (GTI) was also started in 2011, with founding partners China Mobile,Bharti Airtel,SoftBank Mobile,Vodafone,Clearwire, Aero2 andE-Plus.[96] In September 2011, Huawei announced it would partner with Polish mobile provider Aero2 to develop a combined LTE-TDD and LTE-FDD network in Poland,[97] and by April 2012,ZTE Corporation had worked to deploy trial or commercial LTE-TDD networks for 33 operators in 19 countries.[87] 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.[86]
InJapan, SoftBank Mobile launched LTE-TDD services in February 2012 under the nameAdvanced eXtended Global Platform (AXGP), and marketed as SoftBank 4G (ja). The AXGP band was previously used forWillcom'sPHS service, and after PHS was discontinued in 2010 the PHS band was re-purposed for AXGP service.[98][99]
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.[100] WithSprint's acquisition of Clearwire in 2013,[77][101] the carrier began using these frequencies for LTE service on networks built bySamsung,Alcatel-Lucent, andNokia.[102][103]
As of March 2013, 156 commercial 4G LTE networks existed, including 142 LTE-FDD networks and 14 LTE-TDD networks.[88]As of November 2013, the South Korean government planned to allow a fourth wireless carrier in 2014, which would provide LTE-TDD services,[79] and in December 2013, LTE-TDD licenses were granted to China's three mobile operators, allowing commercial deployment of 4G LTE services.[104]
In January 2014, Nokia Solutions and Networks indicated that it had completed a series of tests ofvoice over LTE (
VoLTE) calls on China Mobile's TD-LTE network.[105] 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.[106]
Much of the LTE standard addresses the upgrading of 3G UMTS to what will eventually be4G mobile communications technology. A large amount of the work is aimed at simplifying the architecture of the system, as it transitions from the existing UMTScircuit +packet switching combined network to an all-IP flat architecture system.E-UTRA is the air interface of LTE. Its main features are:
Peak download rates up to 299.6 Mbit/s and upload rates up to 75.4 Mbit/s depending on theuser equipment category (with 4×4 antennas using 20 MHz of spectrum). Five different terminal classes have been defined from a voice-centric class up to a high-end terminal that supports the peak data rates. All terminals will be able to process 20 MHz bandwidth.
Low data transfer latencies (sub-5 mslatency for small IP packets in optimal conditions), lower latencies forhandover and connection setup time than with previousradio access technologies.
Improved support for mobility exemplified by support for terminals moving at up to 350 km/h (220 mph) or 500 km/h (310 mph) depending on the frequency
Increased spectrum flexibility: 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz wide cells are standardized. (W-CDMA has no option for other than 5 MHz slices, leading to some problems rolling out in countries where 5 MHz is a commonly allocated width of the spectrum so would frequently already be in use with legacy standards such as2G GSM andcdmaOne.)
Support for cell sizes from tens of metres radius (femto andpicocells) up to 100 km (62 miles) radiusmacrocells. In the lower frequency bands to be used in rural areas, 5 km (3.1 miles) is the optimal cell size, 30 km (19 miles) having reasonable performance, and up to 100 km cell sizes supported with acceptable performance. In the city and urban areas, higher frequency bands (such as 2.6 GHz in the EU) are used to support high-speed mobile broadband. In this case, cell sizes may be 1 km (0.62 miles) or even less.
Support of at least 200 active data clients (connected users) in every 5 MHz cell.[107]
Simplified architecture: The network side ofE-UTRAN is composed only ofeNode Bs.
Support for inter-operation and co-existence with legacy standards (e.g.,GSM/EDGE,UMTS andCDMA2000). Users can start a call or transfer of data in an area using an LTE standard, and, should coverage be unavailable, continue the operation without any action on their part using GSM/GPRS or W-CDMA-based UMTS or even3GPP2 networks such ascdmaOne or CDMA2000.
Support for MBSFN (multicast-broadcast single-frequency network). This feature can deliver services such as Mobile TV using the LTE infrastructure and is a competitor forDVB-H-based TV broadcast only LTE compatible devices receives LTE signal.
The LTE standard supports onlypacket switching with its all-IP network. Voice calls in GSM, UMTS, and CDMA2000 arecircuit switched, so with the adoption of LTE, carriers will have to re-engineer their voice call network.[108] Four different approaches sprang up:
In this approach, LTE just provides data services, and when a voice call is to be initiated or received, it will fall back to the circuit-switched domain. When using this solution, operators just need to upgrade theMSC instead of deploying theIMS, and therefore, can provide services quickly. However, the disadvantage is a longer call setup delay.
Simultaneous voice and LTE (SVLTE)
In this approach, the handset works simultaneously in the LTE and circuit-switched modes, with the LTE mode providing data services and the circuit-switched mode providing the voice service. This is a solution solely based on the handset, which does not have special requirements on the network and does not require the deployment ofIMS either. The disadvantage of this solution is that the phone can become expensive with high power consumption.
One additional approach that is not initiated by operators is the usage ofover-the-top content (OTT) services, using applications likeSkype andGoogle Talk to provide LTE voice service.[109]
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 a number of carriers promotingVoLGA (Voice over LTE Generic Access) as an interim solution.[110] The idea was to use the same principles asGAN (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 the cost of having to upgrade the entire voice call infrastructure. VoLTE may require Single Radio Voice Call Continuity (SRVCC) to be able to smoothly perform a handover to a 2G or 3G network in case of poor LTE signal quality.[111]
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 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 isAdaptive Multi-Rate Wideband, also known asHD Voice. This codec is mandated in 3GPP networks that support 16 kHz sampling.[112]
Fraunhofer IIS has proposed and demonstrated "Full-HD Voice", an implementation of theAAC-ELD (Advanced Audio Coding – Enhanced Low Delay) codec for LTE handsets.[113] Where previous cell phone voice codecs only supported frequencies up to 3.5 kHz and upcomingwideband audio services branded asHD 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 the caller's and recipient's handsets, as well as networks, have to support the feature.[114]
According to theEuropean Telecommunications Standards Institute's (ETSI)intellectual property rights (IPR) database, about 50 companies have declared, as of March 2012, holdingessential patents covering the LTE standard.[121] The ETSI has made no investigation on the correctness of the declarations however,[121] so that "any analysis of essential LTE patents should take into account more than ETSI declarations."[122] Independent studies have found that about 3.3 to 5 percent of all revenues from handset manufacturers are spent on standard-essential patents. This is less than the combined published rates, due to reduced-rate licensing agreements, such as cross-licensing.[123][124][125]
^Elizabeth Woyke (September 21, 2011)."Identifying The Tech Leaders In LTE Wireless Patents".Forbes. RetrievedMarch 10, 2012.Second comment by the author: "Thus, any analysis of essential LTE patents should take into account more than ETSI declarations."
Beaver, Paul, "What is TD-LTE?", RF&Microwave Designline, September 2011.
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South Korea
Japan
Norway
Hong Kong
United States
Netherlands
Taiwan
Hungary
Sweden
India
