Long-Term Evolution (LTE) is a standard for high-speed wireless communication for mobile phones and data terminals. It is based on the GSM/EDGE and UMTS/HSPA network technologies, increasing the capacity and speed using a different radio interface together with core network improvements. 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. Y LTE is the upgrade same for carriers with both GSM/UMTS networks and CDMA2000 networks. The different LTE frequencies and bands used in different countries will mean that only multi-band phones will be able to use LTE in all countries where it is supported.
LTE is commonly marketed as 4G LTE, but it does 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 originally set forth by the ITU-R organization in the IMT Advanced specification. However, due to marketing pressures and the significant advancements that WiMAX, Evolved High Speed Packet Access and LTE bring to the original 3G technologies, ITU later decided that LTE together with the aforementioned technologies can be called 4G technologies. The LTE Advanced standard formally satisfies the ITU-R requirements to be considered IMT-Advanced. To differentiate LTE Advanced and WiMAX-Advanced from current 4G technologies, ITU has defined them as "True 4G".
- 1 Overview
- 2 History
- 3 LTE-TDD
- 4 LTE Direct
- 5 Features
- 6 Voice calls
- 7 Frequency bands
- 8 Patents
- 9 See also
- 10 References
- 11 Further reading
- 12 External links
LTE stands for Long Term Evolution and is 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 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 to 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.
LTE was first proposed by NTT DoCoMo of Japan in 2004, and studies on the new 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 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 the world’s first LTE smartphone starting on February 10, 2011 both offered by MetroPCS and 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 all the major CDMA operators (such as Verizon, Sprint and MetroPCS in 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 that they intend to migrate to LTE after all. The evolution of LTE is LTE Advanced, which was standardized in March 2011. Services are expected to commence in 2013.
The LTE specification provides downlink peak rates of 300 Mbit/s, uplink peak rates of 75 Mbit/s and QoS provisions permitting 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 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).
3GPP standard development timeline
- In 2004, NTT DoCoMo of Japan proposes LTE as the international standard.
- In September 2006, Siemens Networks (today Nokia 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 an HDTV video in the downlink and playing an interactive game in the uplink have been demonstrated.
- In February 2007, Ericsson demonstrated for the first time in the world LTE with bit rates up to 144 Mbit/s
- In September 2007, NTT docomo demonstrated LTE data rates of 200 Mbit/s with power level below 100 mW during the test.
- 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 
- In early 2008, LTE test equipment began shipping from several vendors and, at the Mobile World Congress 2008 in Barcelona, Ericsson demonstrated the world’s first end-to-end mobile call enabled by LTE on a small handheld device. Motorola demonstrated an LTE RAN standard compliant eNodeB and LTE chipset at the same event.
- At the February 2008 Mobile World Congress:
- 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.
- Ericsson EMP (now ST-Ericsson) demonstrated the world’s first end-to-end LTE call on handheld 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.
- NXP Semiconductors (now a part of ST-Ericsson) demonstrated a multi-mode LTE modem as the basis for a software-defined radio system for use in cellphones.
- 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.
- 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.
- In April 2008, LG Electronics and Nortel demonstrated LTE data rates of 50 Mbit/s while travelling at 110 km/h.
- In November 2008, Motorola demonstrated industry first over-the-air LTE session in 700 MHz spectrum.
- Researchers at Nokia Siemens Networks and Heinrich Hertz Institut have demonstrated LTE with 100 Mbit/s Uplink transfer speeds.
- At the February 2009 Mobile World Congress:
- Infineon demonstrated a single-chip 65 nm CMOS RF transceiver providing 2G/3G/LTE functionality
- Launch of ng Connect program, a multi-industry consortium founded by Alcatel-Lucent to identify and develop wireless broadband applications.
- Motorola provided LTE drive tour on the streets of Barcelona to demonstrate LTE system performance in a real-life metropolitan RF environment 
- In July 2009, Nujira demonstrated efficiencies of more than 60% for an 880 MHz LTE Power Amplifier
- In August 2009, Nortel and LG Electronics demonstrated the first successful handoff between CDMA and LTE networks in a standards-compliant manner 
- In August 2009, Alcatel-Lucent receives FCC certification for LTE base stations for the 700 MHz spectrum band.
- In September 2009, Nokia Siemens Networks demonstrated world's first LTE call on standards-compliant commercial software.
- In October 2009, Ericsson and Samsung demonstrated interoperability between the first ever commercial LTE device and the live network in Stockholm, Sweden.
- In October 2009, Alcatel-Lucent's Bell Labs, Deutsche Telekom 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 Long Term Evolution (LTE) and 3G networks.
- In November 2009, Alcatel-Lucent completed first live LTE call using 800 MHz spectrum band set aside as part of the European Digital Dividend (EDD).
- In November 2009, Nokia Siemens Networks and LG completed first end-to-end interoperability testing of LTE.
- On December 14, 2009, the first commercial LTE deployment was in the Scandinavian capitals Stockholm and Oslo by the Swedish-Finnish network operator TeliaSonera and its Norwegian brandname NetCom (Norway). TeliaSonera incorrectly branded the network "4G". The modem devices on offer were manufactured by Samsung (dongle GT-B3710), and the network infrastructure with SingleRAN technology created by Huawei (in Oslo) and Ericsson (in Stockholm). TeliaSonera plans to roll out nationwide LTE across Sweden, Norway and Finland. TeliaSonera used spectral bandwidth of 10 MHz (out of the maximum 20 MHz), and Single-Input and Single-Output transmission. The deployment should have provided a physical layer net bitrates of up to 50 Mbit/s downlink and 25 Mbit/s in the uplink. Introductory tests showed a TCP goodput of 42.8 Mbit/s downlink and 5.3 Mbit/s uplink in Stockholm.
- In December 2009, ST-Ericsson and Ericsson first to achieve LTE and HSPA mobility with a multimode device.
- In January 2010, Alcatel-Lucent and LG complete a live handoff of an end-to-end data call between Long Term Evolution (LTE) and CDMA networks.
- In February 2010, Nokia Siemens Networks and Movistar test the LTE in Mobile World Congress 2010 in Barcelona, Spain, with both indoor and outdoor demonstrations.
- In May 2010, Mobile TeleSystems (MTS) and Huawei showed an indoor LTE network at "Sviaz-Expocomm 2010" in Moscow, Russia. 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 with Alcatel-Lucent.
- At the Shanghai Expo 2010 in May 2010, Motorola demonstrated a live LTE in conjunction with China Mobile. This included video streams and a drive test system using TD-LTE.
- As of 12/10/2010, DirecTV has teamed up with Verizon Wireless for a test of high-speed Long Term Evolution (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.
- 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.
Carrier adoption timeline
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:
- 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.
- On November 24, 2009: Telecom Italia announced the first outdoor pre-commercial experimentation in the world, deployed in Torino and totally integrated into the 2G/3G network currently in service.
- On December 14, 2009, the world's first publicly available LTE service was opened by TeliaSonera in the two Scandinavian capitals Stockholm and Oslo.
- On May 28, 2010, Russian operator Scartel announced the launch of an LTE network in Kazan by the end of the 2010.
- On October 6, 2010, Canadian provider Rogers Communications Inc announced that Ottawa, Canada's national capital, will 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.
- 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.
- On May 7, 2011, Sri Lankan Mobile Operator Dialog Axiata PLC switched on the first pilot 4G LTE Network in South Asia with vendor partner Huawei and demonstrated a download data speed up to 127 Mbit/s.
- 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 and Yellowknife.
- Telus Mobility has announced that it will adopt LTE as its 4G wireless standard.
- Cox Communications has its first tower for wireless LTE network build-out. Wireless services launched in late 2009.
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 is one of the two mobile data transmission technologies of the Long-Term Evolution (LTE) technology standard, the other being Frequency-Division Long-Term Evolution (LTE-FDD). While some companies refer to LTE TDD as "TD-LTE", there is no reference to that acronym anywhere in the 3GPP specifications.
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, 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 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 China Mobile Hong Kong Company Limited and Hi3G Access have developed dual-mode networks in China and Sweden, respectively.
The creation of LTE-TDD involved 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 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, 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 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 LTE-TDD Initiative (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 a combined LTE TDD and 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 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, 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 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 throughput using a LTE-TDD network, surpassing the previous record of 1.6 gigbits per second.
A new LTE protocol named LTE Direct works as an innovative device-to-device technology enabling the discovery of thousands of devices in the proximity of approximately 500 meters. Pioneered by Qualcomm, the company has been leading the standardization of this new technology along with other 3GPP participants. LTE Direct offers several advantages over existing proximity solutions including but not limited to Wi-Fi or Bluetooth. One of the most popular use cases for this technology was developed by a New York City based company called Compass.to. The core feature of proximal discovery among devices included a targeted discount voucher to a nearby device which matched specific interests. The Compass.to use case was featured at global conferences and events such as CES 2015, MWC 2015, and said to be extended to many other scenarios including film festivals, theme parks and sporting events. “You can think of LTE Direct as a sixth sense that is always aware of the environment around you,” said Mahesh Makhijani, technical marketing director at Qualcomm, at a session on the technology. Additionally, the protocol offers less battery drainage and extended range when compared to other proximity solutions.
Much of the LTE standard addresses the upgrading of 3G UMTS to what will eventually be 4G mobile communications technology. A large amount of 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:
- Peak download rates up to 299.6 Mbit/s and upload rates up to 75.4 Mbit/s depending on the user 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 ms latency for small IP packets in optimal conditions), lower latencies for handover and connection setup time than with previous radio 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 band.
- Orthogonal frequency-division multiple access for the downlink, Single-carrier FDMA for the uplink to conserve power.
- Support for both FDD and TDD communication systems as well as half-duplex FDD with the same radio access technology.
- Support for all frequency bands currently used by IMT systems by ITU-R.
- 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 spectrum so would frequently already be in use with legacy standards such as 2G GSM and cdmaOne.)
- Support for cell sizes from tens of metres radius (femto and picocells) up to 100 km (62 miles) radius macrocells. 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 city and urban areas, higher frequency bands (such as 2.6 GHz in EU) are used to support high speed mobile broadband. In this case, cell sizes may be 1 km (0.62 miles) or even less.
- Supports at least 200 active data clients in every 5 MHz cell.
- Simplified architecture: The network side of E-UTRAN is composed only of eNode Bs.
- Support for inter-operation and co-existence with legacy standards (e.g., GSM/EDGE, UMTS and CDMA2000). 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 even 3GPP2 networks such as cdmaOne or CDMA2000.
- Packet switched radio interface.
- 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 for DVB-H-based TV broadcast.
The LTE standard supports only packet switching with its all-IP network. Voice calls in GSM, UMTS and CDMA2000 are circuit switched, so with the adoption of LTE, carriers will have to re-engineer their voice call network. Three different approaches sprang up:
- Voice over LTE (VoLTE)
Main article: Voice over LTE
- Circuit-switched fallback (CSFB)
- 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 the MSC instead of deploying the IMS, and therefore, can provide services quickly. However, the disadvantage is 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 of IMS either. The disadvantage of this solution is that the phone can become expensive with high power consumption.
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 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 the cost of having to upgrade the entire voice call infrastructure. VoLTE will also require Single Radio Voice Call Continuity (SRVCC) in order to be able to smoothly perform a handover to a 3G network in case of poor LTE signal quality.
While the industry has seemingly standardized on VoLTE for the future, the demand for voice calls today has led LTE carriers to introduce CSFB as a stopgap measure. When placing or receiving a voice call, LTE handsets will fall back to old 2G or 3G networks for the duration of the call.
Enhanced voice quality
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 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 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. In North America, 700, 750, 800, 850, 1900, 1700/2100 (AWS), 2300 (WCS) 2500 and 2600 MHz (Rogers Communications, Bell Canada) are used (bands 2, 4, 5, 7, 12, 13, 17, 25, 26, 30, 41); 2500 MHz in South America; 700, 800, 900, 1800, 2600 MHz in Europe (bands 3, 7, 20); 800, 1800 and 2600 MHz in Asia (bands 1, 3, 5, 7, 8, 11, 13, 40) and 1800 MHz and 2300 MHz in Australia and New Zealand (bands 3, 40). 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 the LTE standard. The ETSI has made no investigation on the correctness of the declarations however, so that "any analysis of essential LTE patents should take into account more than ETSI declarations."
The table below shows the available LTE royalty:
|Huawei Technologies Co., Ltd.||1.50%|
|Motorola Mobility Inc.||2.25%|
|Nokia Siemens Networks||0.80%|
|Nortel Networks Ltd||1.00%|
|Samsung Electronics Co., Ltd.||2.40%|
- 4G-LTE filter
- Comparison of wireless data standards
- E-UTRA – the radio access network used in LTE
- Simulation of LTE Networks
- Flat IP – flat IP architectures in mobile networks
- HSPA+ – an enhancement of the 3GPP HSPA standard
- QoS Class Identifier (QCI) - the mechanism used in LTE networks to allocate proper Quality of Service to bearer traffic
- System architecture evolution – the re-architecturing of core networks in LTE
- WiMAX – a competitor to LTE
- "An Introduction to LTE". 3GPP LTE Encyclopedia. Retrieved December 3, 2010.
- "Long Term Evolution (LTE): A Technical Overview" (PDF). Motorola. Retrieved July 3, 2010.
- "Newsroom • Press Release". Itu.int. Retrieved 2012-10-28.
- "ITU-R Confers IMT-Advanced (4G) Status to 3GPP LTE" (Press release). 3GPP. 20 October 2010. Retrieved 18 May 2012.
- pressinfo (2009-10-21). "Press Release: IMT-Advanced (4G) Mobile wireless broadband on the anvil". Itu.int. Retrieved 2012-10-28.
- "Newsroom • Press Release". Itu.int. Retrieved 2012-10-28.
- ETSI Long Term Evolution page
- "Work Plan 3GPP (Release 8)". 16 January 2012. Retrieved 1 March 2012.
- "LSTI job complete". Retrieved 1 March 2012.
- "LTE/SAE Trial Initiative (LSTI) Delivers Initial Results". 7 November 2007. Retrieved 1 March 2012.
- Temple, Stephen. "Vintage Mobiles: Samsung SCH-r900 – The world's first LTE Mobile (2010)". History of GMS: Birth of the mobile revolution.
- "Samsung Craft, the world's first 4G LTE phone, now available at MetroPCS". Unwired View. September 21, 2010.
- "MetroPCS debuts first 4G LTE Android phone, Samsung Galaxy Indulge". Android and Me. 2011-02-09. Retrieved 2012-03-15.
- "MetroPCS snags first LTE Android phone". Networkworld.com. Retrieved 2012-03-15.
- "Verizon launches its first LTE handset". Telegeography.com. 2011-03-16. Retrieved 2012-03-15.
- "HTC ThunderBolt is officially Verizon's first LTE handset, come March 17th". Phonearena.com. Retrieved 2012-03-15.
- "Rogers lights up Canada's first LTE network today". CNW Group Ltd. 2011-07-07. Retrieved 2012-10-28.
- LTE – An End-to-End Description of Network Architecture and Elements. 3GPP LTE Encyclopedia. 2009.
- "AT&T commits to LTE-Advanced deployment in 2013, Hesse and Mead unfazed". Engadget. 2011-11-08. Retrieved 2012-03-15.
- LTE – an introduction (PDF). Ericsson. 2009.
- "Long Term Evolution (LTE)" (PDF). Motorola. Retrieved April 11, 2011.
- Faster cell phone services planned
- Nomor Research: World's first LTE demonstration
- Ericsson demonstrates live LTE at 144Mbps
- NTT DoCoMo develops low power chip for 3G LTE handsets
- Infineon Ships One Billion RF-Transceivers; Introduces Next-Generation LTE Chip
- SMARTi LTE Specifications
- Ericsson to make World-first demonstration of end-to-end LTE call on handheld devices at Mobile World Congress, Barcelona
- "Motorola Media Center – Press Releases". Motorola.com. February 7, 2008. Retrieved March 24, 2010.
- Gardner, W. David. "Freescale Semiconductor To Demo LTE In Mobile Handsets", Information Week, February 8, 2008.
- Walko, John "NXP powers ahead with programmable LTE modem", EETimes, January 30, 2008.
- Walko, John "PicoChip, MimoOn team for LTE ref design", EETimes, February 4, 2008.
- "Motorola Media Center – Press Releases". Motorola.com. March 26, 2008. Retrieved March 24, 2010.
- Nortel and LG Electronics Demo LTE at CTIA and with High Vehicle Speeds:: Wireless-Watch Community
- "Motorola Media Center – – Motorola Demonstrates Industry First Over-the-Air LTE Session in 700MHz Spectrum". Mediacenter.motorola.com. November 3, 2008. Retrieved March 24, 2010.
- Researchers demo 100 Mbit/s MIMO with SDMA / virtual MIMO technology
- "Infineon Introduces Two New RF-Chips for LTE and 3G – SMARTi LU for Highest Data Rates with LTE and SMARTi UEmicro for Lowest Cost 3G Devices – Infineon Technologies". Infineon.com. January 14, 2009. Retrieved March 24, 2010.
- "MWC: Alcatel-Lucent focusing on cross-industry collaboration". Telephonyonline.com. Retrieved March 24, 2010.
- "Motorola Media Center – Press Releases – Motorola Brings LTE to Life on the Streets of Barcelona". Mediacenter.motorola.com. February 16, 2009. Retrieved March 24, 2010.
- "achieves best ever LTE transmitter efficiency". Nujira. July 16, 2009. Retrieved March 24, 2010.
- "News Releases: Nortel and LG Electronics Complete World's First 3GPP Compliant Active Handover Between CDMA and LTE Networks". Nortel. August 27, 2009. Retrieved March 24, 2010.
- "Alcatel-Lucent gains LTE/700 MHz certification – RCR Wireless News". Rcrwireless.com. August 24, 2009. Retrieved March 24, 2010.
- "World's first LTE call on commercial software". Nokia Siemens Networks. September 17, 2009. Retrieved March 24, 2010.
- "Light Reading Mobile – 4G/LTE – Ericsson, Samsung Make LTE Connection – Telecom News Analysis". Unstrung.com. Retrieved March 24, 2010.
- Lynnette Luna (October 17, 2009). "Alcatel-Lucent says new antenna technology boosts LTE, 3G data speeds". FierceBroadbandWireless. Retrieved March 24, 2010.
- "Alcatel-Lucent completes first 800MHz live LTE call". The Inquirer. January 11, 2010. Retrieved March 24, 2010.
- "and LG complete first end-to-end interoperability testing of LTE". Nokia Siemens Networks. November 24, 2009. Retrieved March 24, 2010.
- Goldstein, Phil (14 December 2009). "TeliaSonera launches first commercial LTE network". fiercewireless.com. FierceMarkets. Retrieved 21 October 2011.
- NetCom.no – NetCom 4G (in English)
- Daily Mobile Blog
- "ST-Ericsson". ST-Ericsson. Retrieved March 24, 2010.
- "Alcatel-Lucent and LG Electronics Complete a Live Handoff of an End-to-End Data Call Between Long Term Evolution (LTE) and CDMA networks". Your Communication News. January 8, 2010. Retrieved March 24, 2010.
- "4G Wireless Evolution – Telefonica and Nokia Siemens Demonstrate Live LTE in a Real Network Environment". 4g-wirelessevolution.tmcnet.com. February 15, 2010. Retrieved March 24, 2010.
- "MTS and Huawei showcase LTE at Sviaz-Expocomm 2010" (in Russian). Mobile TeleSystems. May 11, 2010. Retrieved 2010-05-22.
- "Motorola and CMCC LTE live network at Shanghai Expo 2010".
- "DirecTV Tests LTE With Verizon Wireless".
- "Sri Lanka Telecom Mobitel Rings In 20 Successful Years".
- "LTE Commercial Contracts". Retrieved December 10, 2010.
- "Telefónica drives fourth generation mobile technology by commissioning six advanced pilot trials" (PDF). Retrieved October 2, 2009.
- "Telecom accende la rete mobile di quarta generazione". Il Sole 24 ORE. Retrieved March 24, 2010.
- Scartel to launch “$30–$40m” LTE network in Kazan
- "Rogers launches first LTE technical trial in Ottawa". reuters.com. October 6, 2010.
- Mobitel - PressReleases1
- Dialog empowers Colombo as South Asia’s first 4G LTE powered city | DailyFT – Be Empowered
- reportonbusiness.com: Wireless sales propel Telus results
- Cox goes with LTE-ready CDMA
- "Huawei rejects EU dumping, subsidy charges". China Daily (European edition). 23 May 2013. Retrieved 9 January 2014.
- Michael Kan (20 January 2011). "Huawei: More Trials of TD-LTE in Asia Expected". PC World. Retrieved 9 December 2013.
- Liau Yun Qing (22 June 2011). "China's TD-LTE spreads across globe". ZDNet. Retrieved 9 December 2013.
- Dan Meyer (25 February 2013). "MWC 2013: TD-LTE group touts successful global roaming trials". RCR Wireless News. Retrieved 10 December 2013.
- Dan Jones (16 October 2012). "Defining 4G: What the Heck Is LTE TDD?". Light Reading. Retrieved 9 January 2014.
- Kim Yoo-chul (18 November 2013). "Gov't to pick 4th mobile carrier". The Korea Times. Retrieved 10 December 2013.
- Ian Poole. "LTE-FDD, TDD, TD-LTE Duplex Schemes". Radio-electronics.com. Retrieved 9 January 2014.
- Cian O'Sullivan (10 November 2010). "Nokia developing TD-LTE devices for China Mobile". GoMo News. Retrieved 9 December 2013.
- Josh Taylor (4 December 2012). "Optus to launch TD-LTE 4G network in Canberra". ZDNet. Retrieved 9 January 2014.
- Ian Poole. "LTE Frequency Bands & Spectrum Allocations". Radio-electronics.com. Retrieved 9 January 2014.
- "MWC 2013: Ericsson and China Mobile demo first dual mode HD VoLTE call based on multi-mode chipsets". Wireless - Wireless Communications For Public Services And Private Enterprises. Noble House Media. 4 March 2013. Retrieved 9 January 2014.
- Steve Costello (2 August 2013). "GCF and GTI partner for TD-LTE device certification". Mobile World Live. Retrieved 9 January 2014.
- "Qualcomm India's Dr. Avneesh Agrawal on 4G, Snapdragon and more". Digit. 8 February 2013. Retrieved 10 December 2013.
- "ZTE, China Mobile Hong Kong to construct LTE-TDD network". TT Magazine. 20 July 2012. Retrieved 10 December 2013.
- Tan Min (7 May 2013). "Competitors Try Curbing China Mobile's 4G Urge". Caixin Online. Caixin Media. Retrieved 10 December 2013.
- Sophie Curtis (4 January 2012). "TD-LTE 4G standard gains momentum: ABI Research". Techworld. Retrieved 10 December 2013.
- Nick Wood (21 October 2011). "Huawei trials white spaces TD-LTE kit". Total Telecom. Retrieved 10 December 2013.
- "Intel and Huawei set up LTE TDD lab in China". Global Telecoms Business. 10 April 2012. Retrieved 10 December 2013.
- Sharif Sakr (8 December 2011). "Nokia Siemens promises better TD-LTE and CDMA coverage, no alarms or surprises". Engadget. Retrieved 10 December 2013.
- Kevin Fitchard (4 July 2013). "Belgium's Accelleran aims to corner the small cell market for that other LTE". GigaOM. Retrieved 10 December 2013.
- "Ericsson, Reliance showcases first LTE-TDD ecosystem". The Indian Express. 2 December 2010. Retrieved 9 December 2013.
- "Nokia Siemens Networks TD-LTE whitepaper" (PDF). 2010. Retrieved 5 March 2014.
- "LTE TDD: network plans, commitments, trials, deployments". Telecoms.com. Retrieved 11 December 2013.
- "Huawei partners with Aero2 to launch LTE TDD/FDD commercial network". Computer News Middle East. 21 September 2011. Retrieved 10 December 2013.
- Sam Byford (20 February 2012). "SoftBank launching 110Mbps AXGP 4G network in Japan this week". The Verge. Retrieved 7 June 2015.
- Zahid Ghadialy (21 February 2012). "SoftBank launching 110Mbps AXGP 4G network in Japan this week". The 3G4G Blog. Retrieved 7 June 2015.
- Phil Goldstein (22 June 2012). "Report: TD-LTE to power 25% of LTE connections by 2016". FierceWireless. Retrieved 10 December 2013.
- Rachel King (9 July 2013). "Done deal: Sprint now owns 100 percent of Clearwire". ZDNet. Retrieved 10 December 2013.
- Kevin Fitchard (30 October 2013). "What's igniting Spark? A look inside Sprint's super-LTE network". GigaOM. Retrieved 10 December 2013.
- Sarah Reedy (12 July 2013). "Sprint's LTE TDD Future to Boost Current Vendors". Light Reading. Retrieved 10 December 2013.
- Richard Lai (4 December 2013). "China finally grants 4G licenses, but still no iPhone deal for China Mobile". Engadget. Retrieved 10 December 2013.
- Ben Munson (31 January 2014). "China Mobile, NSN Complete Live VoLTE Test on TD-LTE". Wireless Week. Retrieved 11 February 2014.
- "NSN and Sprint achieves huge leap in TD-LTE network speeds". TelecomTiger. 6 February 2014. Retrieved 11 February 2014.
- "LTE Direct | Research Project | Qualcomm". Qualcomm. Retrieved 2015-10-20.
- "LTE Direct: A thriving ecosystem and amazing use cases on full display at MWC 2015 [VIDEOS] | Qualcomm". Qualcomm. Retrieved 2015-10-20.
- Sesia, Toufik, Baker: LTE – The UMTS Long Term Evolution; From Theory to Practice, page 11. Wiley, 2009.
- "Evolution of LTE". LTE World. Retrieved October 24, 2011.
- "Voice and SMS in LTE Technology White Paper, Rohde & Schwarz, 2011"
-  Huawei Communicate Magazine, Issue 61, September 2011.
- VoLGA whitepaper
- Qualcomm Chipset Powers First Successful VoIP-Over-LTE Call With Single Radio Voice Call Continuity
- Erricsson - LTE delivers superior voice, too
- Fraunhofer IIS Demos Full-HD Voice Over LTE On Android Handsets
- "Firm Set to Demo HD Voice over LTE"
- "EC makes official recommendation for 790–862 MHz release". 29 October 2009. Retrieved 11 March 2012.
- "Europe plans to reserve 800MHz frequency band for LTE and WiMAX". 16 May 2010. Retrieved 11 March 2012.
- CSL begins dual-band 1800/2600 LTE rollout
- Oredoo - The Technology
- Telstra switches on first LTE network on 1800MHz in Australia
- Optus still evaluating LTE
- "New Zealand 4G LTE launch". 28 February 2013.
- "Who Owns LTE Patents?". ipeg. March 6, 2012. Retrieved March 10, 2012.
- Elizabeth Woyke (2011-09-21). "Identifying The Tech Leaders In LTE Wireless Patents". Forbes. Retrieved March 10, 2012. Second comment by the author: "Thus, any analysis of essential LTE patents should take into account more than ETSI declarations."
- Gautam Siwach, Dr. Amir Esmailpour "LTE Security Potential Vulnerability and Algorithm Enhancements", IEEE Canadian Conference on Electrical and Computer Engineering," IEEE CCECE, Toronto, Canada, May 2014
- Erik Dahlman, Stefan Parkvall, Johan Sköld "4G – LTE/LTE-Advanced for Mobile Broadband", Academic Press, 2011, ISBN 978-0-12-385489-6
- Stefania Sesia, Issam Toufik, and Matthew Baker, "LTE – The UMTS Long Term Evolution – From Theory to Practice", Second Edition including Release 10 for LTE-Advanced, John Wiley & Sons, 2011, ISBN 978-0-470-66025-6
- Chris Johnson, "LTE in BULLETS", CreateSpace, 2010, ISBN 978-1-4528-3464-1
- Erik Dahlman, Stefan Parkvall, Johan Sköld, Per Beming, "3G Evolution – HSPA and LTE for Mobile Broadband", 2nd edition, Academic Press, 2008, ISBN 978-0-12-374538-5
- Borko Furht, Syed A. Ahson, "Long Term Evolution: 3GPP LTE Radio And Cellular Technology", Crc Press, 2009, ISBN 978-1-4200-7210-5
- F. Khan, "LTE for 4G Mobile Broadband – Air Interface Technologies and Performance", Cambridge University Press, 2009
- Mustafa Ergen, "Mobile Broadband – Including WiMAX and LTE", Springer, NY, 2009
- H. Ekström, A. Furuskär, J. Karlsson, M. Meyer, S. Parkvall, J. Torsner, and M. Wahlqvist, "Technical Solutions for the 3G Long-Term Evolution," IEEE Commun. Mag., vol. 44, no. 3, March 2006, pp. 38–45
- E. Dahlman, H. Ekström, A. Furuskär, Y. Jading, J. Karlsson, M. Lundevall, and S. Parkvall, "The 3G Long-Term Evolution – Radio Interface Concepts and Performance Evaluation," IEEE Vehicular Technology Conference (VTC) 2006 Spring, Melbourne, Australia, May 2006
- K. Fazel and S. Kaiser, Multi-Carrier and Spread Spectrum Systems: From OFDM and MC-CDMA to LTE and WiMAX, 2nd Edition, John Wiley & Sons, 2008, ISBN 978-0-470-99821-2
- Agilent Technologies, "LTE and the Evolution to 4G Wireless: Design and Measurement Challenges", John Wiley & Sons, 2009 ISBN 978-0-470-68261-6
- Sajal K. Das, John Wiley & Sons (April 2010): "Mobile Handset Design", ISBN 978-0-470-82467-2 .
- Beaver, Paul, "What is TD-LTE?", RF&Microwave Designline, September 2011.
- Dan Forsberg, Günther Horn, Wolf-Dietrich Moeller, Valtteri Niemi, "LTE Security", Second Edition, John Wiley & Sons Ltd, Chichester 2013, ISBN 978-1-118-35558-9
- SeungJune Yi, SungDuck Chun, YoungDae lee, SungJun Park, SungHoon Jung, "Radio Protocols for LTE and LTE-Advanced", Wiley, 2012, ISBN 978-1-118-18853-8
- G. Miao, J. Zander, K-W Sung, and B. Slimane, "Fundamentals of Mobile Data Networks", Cambridge University Press, 2016, ISBN 1107143217
Find more about
at Wikipedia's sister projects
|Media from Commons|
White papers and other technical information
- LTE technology introduction
- "Long-Term 3G Evolution – Radio Access" by Dr. Stefan Parkvall at Ericsson Research
- "3GPP Long-Term Evolution / System Architecture Evolution: Overview" by Ulrich Barth at Alcatel
- LTE and the Evolution to 4G Wireless Design and Measurement Challenges – "LTE Security"
- Role of Crypto in Mobile Communications "LTE Security"
- Dr. Maode Ma "Security Investigation in 4G LTE Wireless Networks", 2012. [dead]
- LTE Uplink Interference Modeling