LTE, an initialism of long-term evolution, marketed as 4G LTE, is a standard for wireless communication of high-speed data 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.
The world's first publicly available LTE service was launched by TeliaSonera in Oslo and Stockholm on December 14 2009. LTE is the natural upgrade path for carriers with both GSM/UMTS networks and CDMA networks such as Verizon Wireless, who launched the first large-scale LTE network in North America in 2010, and au by KDDI in Japan have announced they will migrate to LTE. LTE is, therefore, anticipated to become the first truly global mobile phone standard, although the use of different frequency bands in different countries will mean that only multi-band phones will be able to use LTE in all countries where it is supported.
Although marketed as a 4G wireless service, LTE as specified in the 3GPP Release 8 and 9 document series does not satisfy the technical requirements the 3GPP consortium has adopted for its new standard generation, and which were originally set forth by the ITU-R organization in its IMT-Advanced specification. However, due to marketing pressures and the significant advancements that WIMAX, HSPA+ 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. And to differentiate LTE-Advanced and WiMAX-Advanced from current 4G technologies, ITU has defined them as "True 4G".
LTE is a standard for wireless data communications technology and an evolution of the GSM/UMTS standards. 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 wireless 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) and 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-UTRAN cell will support up to four times the data and voice capacity supported by HSPA).
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 transits 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 4x4 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.
- OFDMA for the downlink, SC-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 requires 5 MHz slices, leading to some problems with roll-outs of the technology in countries where 5 MHz is a commonly allocated amount of spectrum, and is frequently already 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.
Voice calls 
The LTE standard only supports 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:
- VoLTE (Voice Over LTE): This approach is based on the IP Multimedia Subsystem (IMS) network, with specific profiles for control and media planes of voice service on LTE defined by GSMA in PRD IR.92. This approach results in the voice service (control and media planes) being delivered as data flows within the LTE data bearer. This means that there is no dependency on (or ultimately, requirement for) the legacy Circuit Switch voice network to be maintained.
- CSFB (Circuit Switched Fallback): 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 CS 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.
- SVLTE (Simultaneous Voice and LTE): In this approach, the handset works simultaneously in the LTE and CS modes, with the LTE mode providing data services and the CS 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.
One additional approach which is not initiated by operators is the usage of Over-the-top content services, using applications like Skype and Google Talk to provide LTE voice service. However, now and in the foreseeable future, the voice call service is, and will still be, the main revenue source for the mobile operators. So handing the LTE voice service over completely to the OTT actors is thus something which is not expected to receive much support in the telecom industry.
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.
Frequency bands 
The LTE standard can be used with many different frequency bands. In North America, 700, 800, 1900 and 1700/2100 MHz (AWS) are used; 2500 MHz in South America; 800, 900, 1800, 2600 MHz in Europe; 1800 and 2600 MHz in Asia; and 1800 MHz in Australia and New Zealand. 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."
See also 
- Comparison of wireless data standards
- eMBMS – Multicast Broadcast Multimedia Services (MBMS) enhanced for LTE
- E-UTRA – the radio access network used in LTE
- Flat IP – flat IP architectures in mobile networks
- LTE Advanced – the successor to LTE
- System architecture evolution – the re-architecturing of core networks in LTE
- TD-LTE (LTE TDD) – an alternative LTE standard developed by China
- UMB – a proposed competitor to LTE, never commercialized
- WiMAX – a competitor to LTE
- HSPA+ – an enhancement of the 3GPP HSPA standard
- Zadoff–Chu sequence
- Next-generation network
- "An Introduction to LTE". 3GPP LTE Encyclopedia. Retrieved December 3, 2010.
- "Long Term Evolution (LTE): A Technical Overview". Motorola. Retrieved July 3, 2010.
- TeliaSonera first in the world with 4G services
- Verizon Wireless rolled out their LTE network in 38 major markets on December 5, 2010, Happy 1st Anniversary, Verizon Wireless 4G LTE!
- "Verizon 4G LTE speed test using Droid Bionic (video)". September 20, 2011. Retrieved February 4, 2012.
- "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.
- "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. Ericsson. 2009.
- "Long Term Evolution (LTE)". Motorola. Retrieved April 11, 2011.
- 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
- 1800 MHz – The LTE spectrum band that was almost forgotten
- CSL begins dual-band 1800/2600 LTE rollout
- Telstra switches on first LTE network on 1800MHz in Australia
- Optus still evaluating LTE
- "Europe plans to reserve 800MHz frequency band for LTE and WiMAX". 16 May 2010. Retrieved 11 March 2012.
- "EC makes official recommendation for 790–862 MHz release". 29 October 2009. Retrieved 11 March 2012.
- "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."
Further reading 
- 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
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White papers and other technical information 
- LTE Technology Overview and Tutorial Series including Webinars and Video presentations
- "The Long Term Evolution of 3G" on Ericsson Review, no. 2, 2005
- LTE technology introduction
- "3G Long-Term Evolution" by Dr. Erik Dahlman at Ericsson Research
- "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
- The 3G Long-Term Evolution – Radio Interface Concepts and Performance Evaluation
- LTE and the Evolution to 4G Wireless Design and Measurement Challenges – "LTE Security"
- Role of Crypto in Mobile Communications "LTE Security"