4G - Wikipedia, the free encyclopedia

8/7/2019 4G - Wikipedia, the free encyclopedia

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4G - Wikipedia, the free encyclopedia

http://en.wikipedia.org/w/index.php?title=4G&printable=yes[3/22/2011 9:08:12 AM]

4GFrom Wikipedia, the free encyclopedia

In telecommunications, 4G is the fourth generation ofcellularwireless standards. It is a successor to the 3G and 2G families of standards. In 2008, the ITU-Rorganizationspecified the IMT-Advanced (International Mobile Telecommunications Advanced) requirements for 4G standards, setting peak speed requirements for 4G service at100 Mbps for high mobility communication (such as from trains and cars) and 1 Gbps for low mobility communication (such as pedestrians and stationary users). [1]

A 4G system is expected to provide a comprehensive and secure all-IP based mobile broadband solution to laptop computer wireless modems, smartphones, and othermobile devices. Facilities such as ultra-broadband Internet access, IP telephony, gaming services, and streamed multimedia may be provided to users.

Pre-4G technologies such as mobile WiMAX and first-release 3G Long term evolution (LTE) have been on the market since 2006[2] and 2009[3][4][5] respectively, and areoften branded as 4G. The current versions of these technologies did not fulfill the original ITU-Rrequirements of data rates approximately up to 1 Gbit/s for 4G systems.Marketing materials use 4G as a description for Mobile-WiMAX and LTE in their current forms.

IMT-Advanced compliant versions of the above two standards are under development and called LTE Advanced and WirelessMAN-Advanced respectively. ITU hasdecided that LTE Advanced and WirelessMAN-Advanced should be accorded the official designation of IMT-Advanced. On December 6, 2010, ITU announced thatcurrent versions of LTE, WiMax and other evolved 3G technologies that do not fulfill "IMT-Advanced" requirements could be considered "4G", provided they representforerunners to IMT-Advanced and "a substantial level of improvement in performance and capabilities with respect to the initial third generation systems now deployed."[6]

In all suggestions for 4G, the CDMAspread spectrum radio technology used in 3G systems and IS-95 is abandoned and replaced by OFDMA and other frequency-domain

equalization schemes.[citation needed] This is combined with MIMO (Multiple In Multiple Out), e.g., multiple antennas, dynamic channel allocation and channel-dependentscheduling.[citation needed]

Contents

1 Background2 ITU Requirements and 4G wireless standards3 4G Predecessors and candidate systems

3.1 4G candidate systems3.1.1 LTE Advanced3.1.2 IEEE 802.16m or WirelessMAN-Advanced

3.2 4G predecessors and discontinued candidate systems3.2.1 3GPP Long Term Evolution (LTE)3.2.2 Mobile WiMAX (IEEE 802.16e)3.2.3 UMB (formerly EV-DO Rev. C)3.2.4 Flash-OFDM3.2.5 iBurst and MBWA (IEEE 802.20) systems

4 Data rate comparison5 Objective and approach

5.1 Objectives assumed in the literature5.2 Approaches

5.2.1 Principal technologies

6 4G features assumed in early literature

7 Components7.1 Access schemes7.2 IPv6 support7.3 Advanced antenna systems
http://en.wikipedia.org/wiki/Telecommunicationhttp://en.wikipedia.org/wiki/Cellularhttp://en.wikipedia.org/wiki/Wirelesshttp://en.wikipedia.org/wiki/3Ghttp://en.wikipedia.org/wiki/2Ghttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/Internet_protocolhttp://en.wikipedia.org/wiki/Mobile_broadbandhttp://en.wikipedia.org/wiki/Wireless_modemhttp://en.wikipedia.org/wiki/Smartphoneshttp://en.wikipedia.org/wiki/Facility_(telecommunications)http://en.wikipedia.org/wiki/Ultra_Mobile_Broadbandhttp://en.wikipedia.org/wiki/IP_telephonyhttp://en.wikipedia.org/wiki/Mobile_WiMAXhttp://en.wikipedia.org/wiki/Long_term_evolutionhttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/International_Mobile_Telecommunications-2000http://en.wikipedia.org/wiki/LTE_Advancedhttp://en.wikipedia.org/wiki/WirelessMAN-Advancedhttp://en.wikipedia.org/wiki/CDMAhttp://en.wikipedia.org/wiki/Spread_spectrumhttp://en.wikipedia.org/wiki/IS-95http://en.wikipedia.org/wiki/OFDMAhttp://en.wikipedia.org/wiki/Single-carrier_FDMAhttp://en.wikipedia.org/wiki/Single-carrier_FDMAhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/Dynamic_channel_allocationhttp://en.wikipedia.org/wiki/Channel-dependent_schedulinghttp://en.wikipedia.org/wiki/Channel-dependent_schedulinghttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/Channel-dependent_schedulinghttp://en.wikipedia.org/wiki/Channel-dependent_schedulinghttp://en.wikipedia.org/wiki/Dynamic_channel_allocationhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/Single-carrier_FDMAhttp://en.wikipedia.org/wiki/Single-carrier_FDMAhttp://en.wikipedia.org/wiki/OFDMAhttp://en.wikipedia.org/wiki/IS-95http://en.wikipedia.org/wiki/Spread_spectrumhttp://en.wikipedia.org/wiki/CDMAhttp://en.wikipedia.org/wiki/WirelessMAN-Advancedhttp://en.wikipedia.org/wiki/LTE_Advancedhttp://en.wikipedia.org/wiki/International_Mobile_Telecommunications-2000http://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/Long_term_evolutionhttp://en.wikipedia.org/wiki/Mobile_WiMAXhttp://en.wikipedia.org/wiki/IP_telephonyhttp://en.wikipedia.org/wiki/Ultra_Mobile_Broadbandhttp://en.wikipedia.org/wiki/Facility_(telecommunications)http://en.wikipedia.org/wiki/Smartphoneshttp://en.wikipedia.org/wiki/Wireless_modemhttp://en.wikipedia.org/wiki/Mobile_broadbandhttp://en.wikipedia.org/wiki/Internet_protocolhttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/2Ghttp://en.wikipedia.org/wiki/3Ghttp://en.wikipedia.org/wiki/Wirelesshttp://en.wikipedia.org/wiki/Cellularhttp://en.wikipedia.org/wiki/Telecommunication


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7.4 Software-defined radio (SDR)

8 History of 4G and pre-4G technologies8.1 Deployment plans

9 Beyond 4G research10 See also11 References12 External links

Background

The nomenclature of the generations generally refers to a change in the fundamental nature of the service, non-backwards compatible transmission technology, and newfrequency bands. New generations have appeared about every ten years since the first move from 1981 analog (1G) to digital (2G) transmission in 1992. This wasfollowed, in 2001, by 3G multi-media support, spread spectrum transmission and at least 200 kbit/s, in 2011 expected to be followed by 4G, which refers to all- IPpacket-switched networks, mobile ultra-broadband (gigabit speed) access and multi-carrier transmission.[citation needed]

The fastest 3G based standard in the WCDMA family is the HSPA+ standard, which was commercially available in 2009 and offers 28 Mbit/s downstreams without MIMO,i.e. only with one antenna (it would offer 56 Mbit/s with 2x2 MIMO), and 22 Mbit/s upstreams. The fastest 3G based standard in the CDMA2000 family is the EV-DO Rev.B, which was available in 2010 and offers 15.67 Mbit/s downstreams.[citation needed]

In mid 1990s, the ITU-Rorganization specified the IMT-2000 specifications for what standards that should be considered 3G systems. However, the cell phone marketonly brands some of the IMT-2000 standards as 3G (e.g. WCDMA and CDMA2000), but not all ( 3GPP EDGE, DECT and mobile-WiMAX all fulfil the IMT-2000 requirements

and are formally accepted as 3G standards, but are typically not branded as 3G). In 2008, ITU-R specified the IMT-Advanced (International Mobile TelecommunicationsAdvanced) requirements for 4G systems.

ITU Requirements and 4G w ireless standards

This article uses 4G to refer to IMT-Advanced (International Mobile Telecommunications Advanced), as defined by ITU-R. An IMT-Advanced cellular system must fulfilthe following requirements:[7]

Based on an all-IP packet switched network.Peak data rates of up to approximately 100 Mbit/s for high mobility such as mobile access and up to approximately 1 Gbit/s for low mobility such as nomadic/localwireless access, according to the ITU requirements.Dynamically share and utilize the network resources to support more simultaneous users per cell.

Scalable channel bandwidth, between 5 and 20 MHz, optionally up to 40 MHz.[8][8][9]

Peaklink spectral efficiency of 15 bit/s/Hz in the downlink, and 6.75 bit/s/Hz in the uplink (meaning that 1 Gbit/s in the downlink should be possible over less than67 MHz bandwidth) and similar system spectral efficiency.Smooth handovers across heterogeneous networks.Ability to offer high quality of service for next generation multimedia support.

In September 2009, the technology proposals were submitted to the International Telecommunication Union (ITU) as 4G candidates. [10] Basically all proposals are basedon two technologies:

LTE Advanced standardized by the 3GPP802.16m standardized by the IEEE (i.e. WiMAX)

Present implementations of WiMAX and LTE are largely considered a stopgap solution that will offer a considerable boost while WiMAX 2 (based on the 802.16m spec)

and LTE Advanced are finalized. Both technologies aim to reach the objectives traced by the ITU, but are still far from being implemented.[7]

The first set of 3GPP requirements on LTE Advanced was approved in June 2008. [11] LTE Advanced will be standardized in 2010 as part of the Release 10 of the 3GPPspecification. LTE Advanced will be fully built on the existing LTE specification Release 10 and not be defined as a new specification series. A summary of the technologies
http://en.wikipedia.org/wiki/Spread_spectrumhttp://en.wikipedia.org/wiki/Internet_Protocolhttp://en.wikipedia.org/wiki/Packet_switchinghttp://en.wikipedia.org/wiki/Packet_switchinghttp://en.wikipedia.org/wiki/Multi-carrierhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/WCDMAhttp://en.wikipedia.org/wiki/HSPA%2Bhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/CDMA2000http://en.wikipedia.org/wiki/EV-DO_Rev._Bhttp://en.wikipedia.org/wiki/EV-DO_Rev._Bhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/IMT-2000http://en.wikipedia.org/wiki/3Ghttp://en.wikipedia.org/wiki/3GPP_EDGEhttp://en.wikipedia.org/wiki/DECThttp://en.wikipedia.org/wiki/WiMAXhttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/Link_spectral_efficiencyhttp://en.wikipedia.org/wiki/LTE_Advancedhttp://en.wikipedia.org/wiki/3GPPhttp://en.wikipedia.org/wiki/802.16mhttp://en.wikipedia.org/wiki/IEEEhttp://en.wikipedia.org/wiki/IEEEhttp://en.wikipedia.org/wiki/802.16mhttp://en.wikipedia.org/wiki/3GPPhttp://en.wikipedia.org/wiki/LTE_Advancedhttp://en.wikipedia.org/wiki/Link_spectral_efficiencyhttp://en.wikipedia.org/wiki/Mobile_phonehttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/WiMAXhttp://en.wikipedia.org/wiki/DECThttp://en.wikipedia.org/wiki/3GPP_EDGEhttp://en.wikipedia.org/wiki/3Ghttp://en.wikipedia.org/wiki/IMT-2000http://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/EV-DO_Rev._Bhttp://en.wikipedia.org/wiki/EV-DO_Rev._Bhttp://en.wikipedia.org/wiki/CDMA2000http://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/HSPA%2Bhttp://en.wikipedia.org/wiki/WCDMAhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/Multi-carrierhttp://en.wikipedia.org/wiki/Packet_switchinghttp://en.wikipedia.org/wiki/Packet_switchinghttp://en.wikipedia.org/wiki/Internet_Protocolhttp://en.wikipedia.org/wiki/Spread_spectrum


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that have been studied as the basis for LTE Advanced is included in a technical report.[12]

Current LTE and WiMAX implementations are considered pre-4G, as they don't fully comply with the planned requirements of 1 Gbit/s for stationary reception and100 Mbit/s for mobile.

Confusion has often been caused by some mobile carriers who have launched products advertised as 4G but which are actually current so-called 3.9G technologies, andtherefore do not follow the ITU-R defined principles for 4G standards. A common argument for branding 3.9G systems as a new generation is that they use otherfrequency bands than 3G technologies, they are based on a new radio-interface paradigm, and the standards are not backwards compatible with 3G but some of them areexpected to be forwards compatible with future "real" 4G technologies. While the ITU has adopted recommendations for technologies that would be used for future globalcommunications, they do not actually do the standardization or development work themselves, instead relying on the work of other standards bodies such as IEEE, The

WiMAX Forum and 3GPP. Recently, ITU-R Working Party 5D approved two industry-developed technologies (LTE Advanced and WirelessMAN-Advanced)[13] for inclusionin the ITUs International Mobile Telecommunications Advanced (IMT-Advanced program), which is focused on global communication systems that would be availableseveral years from now.[citation needed] This working partys objective was not to comment on todays 4G being rolled out in the United States and in fact, the WorkingParty itself purposely agreed not to tie their IMT-Advanced work to the term 4G, recognizing its common use in industry already; however, the ITUs PR departmentignored that agreement and used term 4G anyway when issuing their press release. [citation needed]

The ITUs purpose is to foster the use of communications globally. The ITU is relied upon by developing countries, for example, who want to be assured a technology isstandardised and likely to be widely deployed. While the ITU has adopted recommendations for technologies that would be used for future global communications, theydo not actually do the standardization or development work themselves, instead relying on the work of other standards bodies such as IEEE, The WiMAX Forum and 3GPP.While the ITU has developed recommendations on IMT-Advanced, those recommendations are not binding on ITU member countries. [citation needed]

4G P redecessors and candidate systems

The wireless telecommunications industry as a whole has early assumed the term 4G as a short hand way to describe those advanced cellular technologies that, amongother things, are based on or employ wide channel OFDMA and SC-FDE technologies, MIMO transmission and an all-IP based architecture. [citation needed] Mobile-WiMAX,first release LTE, IEEE 802.20 as well as Flash-OFDM meets these early assumptions, and have been considered as 4G candidate systems, but do not yet meet the morerecent ITU-R IMT-Advanced requirements.

4G candidate systems

LTE Advanced

See also: 3GPP Long Term Evolution (LTE)below

LTE Advanced (Long-term-evolution Advanced) is a candidate for IMT-Advanced standard, formally submitted by the 3GPP organization to ITU-T in the fall 2009, andexpected to be released in 2012. The target of 3GPP LTE Advanced is to reach and surpass the ITU requirements. [14] LTE Advanced is essentially an enhancement toLTE. It is not a new technology but rather an improvement on the existing LTE network. This upgrade path makes it more cost effective for vendors to offer LTE and thenupgrade to LTE Advanced which is similar to the upgrade from WCDMA to HSPA. LTE and LTE Advanced will also make use of additional spectrum and multiplexing toallow it to achieve higher data speeds. Coordinated Multi-point Transmission will also allow more system capacity to help handle the enhanced data speeds. Release 10 ofLTE is expected to achieve the LTE Advanced speeds. Release 8 currently supports up to 300 Mbit/s download speeds which is still short of the IMT-Advancedstandards.[15]

Data speeds of LTEAdvanced

LTE Advanced

Peak Download 1 Gbit/s

Peak Upload 500 Mbit/s

IEEE 802.16m or WirelessMAN-Advanced
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The IEEE 802.16m or WirelessMAN-Advanced evolution of 802.16e is under development, with the objective to fulfill the IMT-Advanced criteria of 1 Gbit/s for stationaryreception and 100 Mbit/s for mobile reception.[16]

4G predecessors and discontinued candidate systems

3GPP L ong Term Evolution (LTE)

See also: LTE Advancedabove

The pre-4G technology 3GPP Long Term Evolution (LTE) is often branded "4G", but the first LTE release does not fully comply with theIMT-Advanced requirements. LTE has a theoretical net bit rate capacity of up to 100 Mbit/s in the downlink and 50 Mbit/s in the uplinkif a 20 MHz channel is used and more ifmultiple-input multiple-output (MIMO), i.e. antenna arrays, are used.

The physical radio interface was at an early stage named High SpeedOFDMPacket Access(HSOPA), now named Evolved UMTSTerrestrial Radio Access (E-UTRA). The first LTE USB dongles do not support any other radio interface.

The world's first publicly available LTE service was opened in the two Scandinavian capitals Stockholm (Ericsson system) and Oslo (aHuawei system) on 14 December 2009, and branded 4G. The user terminals were manufactured by Samsung. [3] Currently, the twopublicly available LTE services in the United States are provided by Metro PCS, and Verizon Wireless[citation needed].AT&T also has anLTE service in the works.[citation needed]

Mobile WiM AX (IEEE 802.16e)

The Mobile WiMAX (IEEE 802.16e-2005) mobile wireless broadband access (MWBA) standard (also known as WiBro in South Korea) issometimes branded 4G, and offers peak data rates of 128 Mbit/s downlink and 56 Mbit/s uplink over 20 MHz widechannels[citation needed].

The world's first commercial mobile WiMAX service was opened by KT in Seoul, South Korea on 30 June 2006.[2]

Sprint Nextel has begun using Mobile WiMAX, as of September 29, 2008 branded as a "4G" network even though the current versiondoes not fulfil the IMT Advanced requirements on 4G systems.[17]

In Russia, Belarus and Nicaragua WiMax broadband internet access is offered by a Russian company Scartel, and is also branded 4G,Yota.

UMB (formerly EV-DO Rev. C)

Main article: Ultra Mobile Broadband

UMB (Ultra Mobile Broadband) was the brand name for a discontinued 4G project within the 3GPP2 standardization group to improve the CDMA2000 mobile phonestandard for next generation applications and requirements. In November 2008, Qualcomm, UMB's lead sponsor, announced it was ending development of the technology,favouring LTE instead.[18] The objective was to achieve data speeds over 275 Mbit/s downstream and over 75 Mbit/s upstream.

Flash-OFDM

At an early stage the Flash-OFDM system was expected to be further developed into a 4G standard.

iBurst and MBW A (IEEE 802.20) systems

Telia-branded Samsung LTEmodem
http://en.wikipedia.org/wiki/IEEE_802.16mhttp://en.wikipedia.org/wiki/WirelessMAN-Advancedhttp://en.wikipedia.org/wiki/4G#LTE_Advancedhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/Net_bit_ratehttp://en.wikipedia.org/wiki/Multiple-input_multiple-outputhttp://en.wikipedia.org/wiki/OFDMhttp://en.wikipedia.org/wiki/Evolved_UMTS_Terrestrial_Radio_Accesshttp://en.wikipedia.org/wiki/Evolved_UMTS_Terrestrial_Radio_Accesshttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/Stockholmhttp://en.wikipedia.org/wiki/Ericssonhttp://en.wikipedia.org/wiki/Oslohttp://en.wikipedia.org/wiki/Huaweihttp://en.wikipedia.org/wiki/Verizon_Wirelesshttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/AT%26Thttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/Mobile_WiMAXhttp://en.wikipedia.org/wiki/WiBrohttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/KT_(telecommunication_company)http://en.wikipedia.org/wiki/Sprint_Nextelhttp://en.wikipedia.org/wiki/Scartelhttp://en.wikipedia.org/wiki/Yotahttp://en.wikipedia.org/wiki/Ultra_Mobile_Broadbandhttp://en.wikipedia.org/wiki/Ultra_Mobile_Broadbandhttp://en.wikipedia.org/wiki/3GPP2http://en.wikipedia.org/wiki/CDMA2000http://en.wikipedia.org/wiki/Qualcommhttp://en.wikipedia.org/wiki/Flash-OFDMhttp://en.wikipedia.org/wiki/TeliaSonerahttp://en.wikipedia.org/wiki/TeliaSonerahttp://en.wikipedia.org/wiki/File:Samsung_4G_LTE_modem-4.jpghttp://en.wikipedia.org/wiki/Flash-OFDMhttp://en.wikipedia.org/wiki/Qualcommhttp://en.wikipedia.org/wiki/CDMA2000http://en.wikipedia.org/wiki/3GPP2http://en.wikipedia.org/wiki/Ultra_Mobile_Broadbandhttp://en.wikipedia.org/wiki/Ultra_Mobile_Broadbandhttp://en.wikipedia.org/wiki/Yotahttp://en.wikipedia.org/wiki/Scartelhttp://en.wikipedia.org/wiki/Sprint_Nextelhttp://en.wikipedia.org/wiki/KT_(telecommunication_company)http://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/WiBrohttp://en.wikipedia.org/wiki/Mobile_WiMAXhttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/AT%26Thttp://en.wikipedia.org/wiki/Wikipedia:Citation_neededhttp://en.wikipedia.org/wiki/Verizon_Wirelesshttp://en.wikipedia.org/wiki/Huaweihttp://en.wikipedia.org/wiki/Oslohttp://en.wikipedia.org/wiki/Ericssonhttp://en.wikipedia.org/wiki/Stockholmhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/Evolved_UMTS_Terrestrial_Radio_Accesshttp://en.wikipedia.org/wiki/Evolved_UMTS_Terrestrial_Radio_Accesshttp://en.wikipedia.org/wiki/OFDMhttp://en.wikipedia.org/wiki/Multiple-input_multiple-outputhttp://en.wikipedia.org/wiki/Net_bit_ratehttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/4G#LTE_Advancedhttp://en.wikipedia.org/wiki/WirelessMAN-Advancedhttp://en.wikipedia.org/wiki/IEEE_802.16m


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The iBurst system ( or HC-SDMA, High Capacity Spatial Division Multiple Access) was at an early stage considered as a 4G predecessor. It was later further developedinto the Mobile Broadband Wireless Access (MBWA) system, also known as IEEE 802.20.

Data rate comparison

The following table shows a comparison of 4G candidate systems as well as other competing technologies.

Comparison of Mobile Internet Access methods ()

Standard FamilyPr imary Use

Radio TechDownlink(Mbit/s)

Uplink(Mbit/ s) Notes

WiMAX 802.16 Mobile Internet MIMO-SOFDMA128 (in20MHzbandwidth)

56 (in20MHzbandwidth)

WiMAX update IEEE 802.16m expected to offer peak rates of at least 1Gbit/s fixed speeds and 100Mbit/s to mobile users.

LTE UMTS/4GSM General 4G OFDMA/MIMO/SC-FDMA

100 (in20MHzbandwidth)

50 (in 20MHzbandwidth)

LTE-Advanced update expected to offer peak rates up to 1 Gbit/s fixedspeeds and 100 Mb/s to mobile users.

Flash-OFDM Flash-OFDM

Mobile Internetmobility up to200mph(350km/h)

Flash-OFDM5.310.615.9

1.83.65.4

Mobile range 30km (18 miles)extended range 55 km (34 miles)

HIPERMAN HIPERMAN Mobile Internet OFDM 56.9

Wi-Fi802.11(11n) Mobile Internet OFDM/MIMO

300 (using 4x4configuration in 20MHz

bandwidth) or 600(using 4x4

configuration in 40MHzbandwidth)

Antenna, RF front end enhancements and minor protocol timer tweaks havehelped deploy long range P2P networks compromising on radial coverage,throughput and/or spectra efficiency (310km(http://www.alvarion.com/index.php/en/news-a-events/global-press-releases/948-worlds-longest-wi-fi-connection-made-by-the-swedish-space-corporation) &382km(http://www.eslared.org.ve/articulos/Long%20Distance%20WiFi%20Trial.pdf))

iBurst 802.20 Mobile Internet HC-

SDMA/TDD/MIMO95 36

Cell Radius: 312 kmSpeed: 250km/h

Spectral Efficiency: 13 bits/s/Hz/cellSpectrum Reuse Factor: "1"EDGE Evolution GSM Mobile Internet TDMA/FDD 1.6 0.5 3GPP Release 7UMTS W-CDMAHSDPA+HSUPA

HSPA+UMTS/3GSM General 3G

CDMA/FDD

CDMA/FDD/MIMO

0.38414.456

0.3845.7622

HSDPA widely deployed. Typical downlink rates today 2 Mbit/s, ~200 kbit/suplink; HSPA+ downlink up to 56 Mbit/s.

UMTS-TDD UMTS/3GSM Mobile Internet CDMA/TDD 16Reported speeds according to IPWireless(http://www.ipwireless.com/technology/) using 16QAM modulation similar toHSDPA+HSUPA

1xRTT CDMA2000 Mobile phone CDMA 0.144 Succeeded by EV-DO for data use, but still is used for voice and as a failoverfor EV-DOEV -

DO 1x Rev. 0EV -

DO 1x Rev.ACDMA2000 Mobile Internet CDMA/FDD

2.453.14.9xN

0.151.81.8xN

Rev B note: N is the number of 1.25 MHz chunks of spectrum used. EV-DOis not designed for voice, and requires a fallback to 1xRTT when a voice callis placed or received.
http://en.wikipedia.org/wiki/IBursthttp://en.wikipedia.org/wiki/Mobile_Broadband_Wireless_Accesshttp://en.wikipedia.org/wiki/WiMAXhttp://en.wikipedia.org/wiki/802.16http://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiple_accesshttp://en.wikipedia.org/wiki/IEEE_802.16mhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/OFDMAhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/SC-FDMAhttp://en.wikipedia.org/wiki/SC-FDMAhttp://en.wikipedia.org/wiki/LTE_Advancedhttp://en.wikipedia.org/wiki/Flash-OFDMhttp://en.wikipedia.org/wiki/Flash-OFDMhttp://en.wikipedia.org/wiki/HIPERMANhttp://en.wikipedia.org/wiki/OFDMhttp://en.wikipedia.org/wiki/Wi-Fihttp://en.wikipedia.org/wiki/IEEE_802.11nhttp://en.wikipedia.org/wiki/OFDMhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/High-gain_antennahttp://en.wikipedia.org/wiki/RF_front_endhttp://en.wikipedia.org/wiki/Network_topology#Point-to-pointhttp://www.alvarion.com/index.php/en/news-a-events/global-press-releases/948-worlds-longest-wi-fi-connection-made-by-the-swedish-space-corporationhttp://www.eslared.org.ve/articulos/Long%20Distance%20WiFi%20Trial.pdfhttp://en.wikipedia.org/wiki/IBursthttp://en.wikipedia.org/wiki/HC-SDMAhttp://en.wikipedia.org/wiki/HC-SDMAhttp://en.wikipedia.org/wiki/Time_division_duplexhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/Enhanced_Data_Rates_for_GSM_Evolution#EDGE_Evolutionhttp://en.wikipedia.org/wiki/GSMhttp://en.wikipedia.org/wiki/Time_division_multiple_accesshttp://en.wikipedia.org/wiki/Frequency_division_duplexhttp://en.wikipedia.org/wiki/3GPPhttp://en.wikipedia.org/wiki/UMTShttp://en.wikipedia.org/wiki/HSDPAhttp://en.wikipedia.org/wiki/HSUPAhttp://en.wikipedia.org/wiki/HSPA%2Bhttp://en.wikipedia.org/wiki/UMTShttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/Frequency_division_duplexhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/List_of_HSDPA_networkshttp://en.wikipedia.org/wiki/HSPA%2Bhttp://en.wikipedia.org/wiki/UMTS-TDDhttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/Time_division_duplexhttp://www.ipwireless.com/technology/http://en.wikipedia.org/wiki/HSDPAhttp://en.wikipedia.org/wiki/HSUPAhttp://en.wikipedia.org/wiki/1xRTThttp://en.wikipedia.org/wiki/CDMA2000http://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/EV-DOhttp://en.wikipedia.org/wiki/EV-DOhttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/Frequency_division_duplexhttp://en.wikipedia.org/wiki/Frequency_division_duplexhttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/EV-DOhttp://en.wikipedia.org/wiki/EV-DOhttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/CDMA2000http://en.wikipedia.org/wiki/1xRTThttp://en.wikipedia.org/wiki/HSUPAhttp://en.wikipedia.org/wiki/HSDPAhttp://www.ipwireless.com/technology/http://en.wikipedia.org/wiki/Time_division_duplexhttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/UMTS-TDDhttp://en.wikipedia.org/wiki/HSPA%2Bhttp://en.wikipedia.org/wiki/List_of_HSDPA_networkshttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/Frequency_division_duplexhttp://en.wikipedia.org/wiki/Code_Division_Multiple_Accesshttp://en.wikipedia.org/wiki/UMTShttp://en.wikipedia.org/wiki/HSPA%2Bhttp://en.wikipedia.org/wiki/HSUPAhttp://en.wikipedia.org/wiki/HSDPAhttp://en.wikipedia.org/wiki/UMTShttp://en.wikipedia.org/wiki/3GPPhttp://en.wikipedia.org/wiki/Frequency_division_duplexhttp://en.wikipedia.org/wiki/Time_division_multiple_accesshttp://en.wikipedia.org/wiki/GSMhttp://en.wikipedia.org/wiki/Enhanced_Data_Rates_for_GSM_Evolution#EDGE_Evolutionhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/Time_division_duplexhttp://en.wikipedia.org/wiki/HC-SDMAhttp://en.wikipedia.org/wiki/HC-SDMAhttp://en.wikipedia.org/wiki/IBursthttp://www.eslared.org.ve/articulos/Long%20Distance%20WiFi%20Trial.pdfhttp://www.alvarion.com/index.php/en/news-a-events/global-press-releases/948-worlds-longest-wi-fi-connection-made-by-the-swedish-space-corporationhttp://en.wikipedia.org/wiki/Network_topology#Point-to-pointhttp://en.wikipedia.org/wiki/RF_front_endhttp://en.wikipedia.org/wiki/High-gain_antennahttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/OFDMhttp://en.wikipedia.org/wiki/IEEE_802.11nhttp://en.wikipedia.org/wiki/Wi-Fihttp://en.wikipedia.org/wiki/OFDMhttp://en.wikipedia.org/wiki/HIPERMANhttp://en.wikipedia.org/wiki/Flash-OFDMhttp://en.wikipedia.org/wiki/Flash-OFDMhttp://en.wikipedia.org/wiki/LTE_Advancedhttp://en.wikipedia.org/wiki/SC-FDMAhttp://en.wikipedia.org/wiki/SC-FDMAhttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/OFDMAhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/IEEE_802.16mhttp://en.wikipedia.org/wiki/Orthogonal_frequency-division_multiple_accesshttp://en.wikipedia.org/wiki/MIMOhttp://en.wikipedia.org/wiki/802.16http://en.wikipedia.org/wiki/WiMAXhttp://en.wikipedia.org/wiki/Mobile_Broadband_Wireless_Accesshttp://en.wikipedia.org/wiki/IBurst


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EV-DO Rev.B

Notes: All speeds are theoretical maximums and will vary by a number of factors, including the use of external antennae, distance from the tower and the ground speed(e.g. communications on a train may be poorer than when standing still). Usually the bandwidth is shared between several terminals. The performance of each technologyis determined by a number of constraints, including the spectral efficiency of the technology, the cell sizes used, and the amount of spectrum available. For moreinformation, see Comparison of wireless data standards.

For more comparison tables, see bit rate progress trends, comparison of mobile phone standards, spectral efficiency comparison table and OFDM system comparison table.

Objective and approach

Objectives assumed in the literature

4G is being developed to accommodate the quality of service (QoS) and rate requirements set by further development of existing 3G applications like mobile broadbandaccess, Multimedia Messaging Service (MMS), video chat, mobile TV, but also new services like HDTV. 4G may allow roaming with wireless local area networks, and mayinteract with digital video broadcasting systems.

In the literature, the assumed or expected 4G requirements have changed during the years before IMT-Advanced was specified by the ITU-R. These are examples ofobjectives stated in various sources:

A nominal data rate of 100 Mbit/s while the client physically moves at high speeds relative to the station, and 1 Gbit/s while client and station are in relatively fixedpositions as defined by the ITU-R[19]

A data rate of at least 100 Mbit/s between any two points in the world[19]

Smooth handoffacross heterogeneous networks[20]

Seamless connectivity and global roaming across multiple networks[21]

High quality of service for next generation multimedia support (real time audio, high speed data, HDTV video content, mobile TV, etc.)[21]

Interoperability with existing wireless standards[22]

An all IP, packet switched network[21]IP-based femtocells (home nodes connected to fixed Internet broadband infrastructure)

Approaches

Principal technologies

Physical layer transmission techniques are as follows:[23]MIMO: To attain ultra high spectral efficiency by means of spatial processing including multi-antenna and multi-user MIMOFrequency-domain-equalization, for example Multi-carrier modulation (OFDM) in the downlink orsingle-carrier frequency-domain-equalization (SC-FDE) in theuplink: To exploit the frequency selective channel property without complex equalization.Frequency-domain statistical multiplexing, for example (OFDMA) or (Single-carrier FDMA) (SC-FDMA, a.k.a. Linearly precoded OFDMA, LP-OFDMA) in theuplink: Variable bit rate by assigning different sub-channels to different users based on the channel conditionsTurbo principleerror-correcting codes: To minimize the required SNRat the reception side

Channel-dependent scheduling: To utilize the time-varying channel.Link adaptation:Adaptive modulation and error-correcting codesRelaying, including fixed relay networks (FRNs), and the cooperative relaying concept, known as multi-mode protocol

4G features assumed in early literature

The 4G system was originally envisioned by the Defense Advanced Research Projects Agency (DARPA).[citation needed] The DARPA selected the distributed architecture,end-to-end Internet protocol (IP), and believed at an early stage in peer-to-peer networking in which every mobile device would be both a transceiver and a router forother devices in the network eliminating the spoke-and-hub weakness of 2G and 3G cellular systems.[24] Since the 2.5G GPRS system, cellular systems have provided dual
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infrastructures: packet switched nodes for data services, and circuit switched nodes for voice calls. In 4G systems, the circuit-switched infrastructure is abandoned, andonly a packet-switched network is provided, while 2.5G and 3G systems require both packet-switched and circuit-switched network nodes, i.e. two infrastructures inparallel. This means that in 4G, traditional voice calls are replaced by IP telephony.

Cellular systems such as 4G allow seamless mobility; thus a file transfer is not interrupted in case a terminal moves from one cell (one base station coverage area) toanother, but handover is carried out. The terminal also keeps the same IP address while moving, meaning that a mobile server is reachable as long as it is within thecoverage area of any server. In 4G systems this mobility is provided by the mobile IP protocol, part of IP version 6, while in earlier cellular generations it was onlyprovided by physical layer and datalink layer protocols. In addition to seamless mobility, 4G provides flexible interoperability of the various kinds of existing wirelessnetworks, such as satellite, cellular wirelss, WLAN, PAN and systems for accessing fixed wireless networks. [25]

While maintaining seamless mobility, 4G will offer very high data rates with expectations of 100 Mbit/s wireless service. The increased bandwidth and higher datatransmission rates will allow 4G users the ability to utilize high definition video and the video conferencing features of mobile devices attached to a 4G network. The 4Gwireless system is expected to provide a comprehensive IP solution where multimedia applications and services can be delivered to the user on an 'Anytime, Anywhere'basis with a satisfactory high data rate, premium quality and high security.[26]

4G is described as MAGIC: mobile multimedia, any-time anywhere, global mobility support, integrated wireless solution, and customized personal service. [citation needed]

Some key features (primarily from users' points of view) of 4G mobile networks are: [citation needed]

High usability: anytime, anywhere, and with any technologySupport for multimedia services at low transmission costPersonalizationIntegrated services

Components

Access schemes

As the wireless standards evolved, the access techniques used also exhibited increase in efficiency, capacity and scalability. The first generation wireless standards usedplain TDMA and FDMA. In the wireless channels, TDMA proved to be less efficient in handling the high data rate channels as it requires large guard periods to alleviatethe multipath impact. Similarly, FDMA consumed more bandwidth for guard to avoid inter carrier interference. So in second generation systems, one set of standard usedthe combination of FDMA and TDMA and the other set introduced an access scheme called CDMA. Usage of CDMA increased the system capacity, but as a theoreticaldrawback placed a soft limit on it rather than the hard limit (i.e. a CDMA network setup does not inherently reject new clients when it approaches its limits, resulting in adenial of service to all clients when the network overloads; though this outcome is avoided in practical implementations by admission control of circuit switched or fixedbitrate communication services). Data rate is also increased as this access scheme (providing the network is not reaching its capacity) is efficient enough to handle themultipath channel. This enabled the third generation systems, such as IS-2000, UMTS, HSXPA, 1xEV-DO, TD-CDMA and TD-SCDMA, to use CDMA as the access scheme.However, the issue with CDMA is that it suffers from poor spectral flexibility and computationally intensive time-domain equalization (high number of multiplications persecond) for wideband channels.

Recently, new access schemes like Orthogonal FDMA (OFDMA), Single Carrier FDMA (SC-FDMA), Interleaved FDMA and Multi-carrier CDMA (MC-CDMA) are gaining moreimportance for the next generation systems. These are based on efficient FFT algorithms and frequency domain equalization, resulting in a lower number of multiplicationsper second. They also make it possible to control the bandwidth and form the spectrum in a flexible way. However, they require advanced dynamic channel allocation andtraffic adaptive scheduling.

WiMax is using OFDMA in the downlink and in the uplink. For the next generation UMTS, OFDMA is used for the downlink. By contrast, IFDMA is being considered for theuplink since OFDMA contributes more to the PAPRrelated issues and results in nonlinear operation of amplifiers. IFDMA provides less power fluctuation and thus avoidsamplifier issues. Similarly, MC-CDMA is in the proposal for the IEEE 802.20 standard. These access schemes offer the same efficiencies as older technologies like CDMA.Apart from this, scalability and higher data rates can be achieved.

The other important advantage of the above mentioned access techniques is that they require less complexity for equalization at the receiver. This is an added advantageespecially in the MIMO environments since the spatial multiplexing transmission of MIMO systems inherently requires high complexity equalization at the receiver.
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In addition to improvements in these multiplexing systems, improved modulation techniques are being used. Whereas earlier standards largely used Phase-shift keying,more efficient systems such as 64QAM are being proposed for use with the 3GPP Long Term Evolution standards.

IPv6 support

Main articles: Network layer, Internet protocol, andIPv6

Unlike 3G, which is based on two parallel infrastructures consisting of circuit switched and packet switched network nodes respectively, 4G will be based on packetswitching only. This will require low-latency data transmission.

By the time that 4G was deployed, the process of IPv4 address exhaustion was expected to be in its final stages. Therefore, in the context of 4G, IPv6 support is essentialin order to support a large number of wireless-enabled devices. By increasing the number ofIP addresses, IPv6 removes the need for network address translation (NAT),a method of sharing a limited number of addresses among a larger group of devices, although NAT will still be required to communicate with devices that are on existingIPv4 networks.

As of June 2009,Verizon has posted specifications (https://www22.verizon.com/opendev/Forum/LTE_Document_Archives.aspx) that require any 4G devices on its networkto support IPv6.[27]

Advanced antenna system s

Main articles: MIMOandMU-MIMO

The performance of radio communications depends on an antenna system, termed smart or intelligent antenna. Recently, multiple antenna technologies are emerging to

achieve the goal of 4G systems such as high rate, high reliability, and long range communications. In the early 1990s, to cater for the growing data rate needs of datacommunication, many transmission schemes were proposed. One technology, spatial multiplexing, gained importance for its bandwidth conservation and power efficiency.Spatial multiplexing involves deploying multiple antennas at the transmitter and at the receiver. Independent streams can then be transmitted simultaneously from all theantennas. This technology, called MIMO (as a branch ofintelligent antenna), multiplies the base data rate by (the smaller of) the number of transmit antennas or thenumber of receive antennas. Apart from this, the reliability in transmitting high speed data in the fading channel can be improved by using more antennas at thetransmitter or at the receiver. This is called transmitor receive diversity. Both transmit/receive diversity and transmit spatial multiplexing are categorized into the space-time coding techniques, which does not necessarily require the channel knowledge at the transmitter. The other category is closed-loop multiple antenna technologies,which require channel knowledge at the transmitter.

Software-defined radio (SDR)

SDRis one form of open wireless architecture (OWA). Since 4G is a collection of wireless standards, the final form of a 4G device will constitute various standards. This

can be efficiently realized using SDR technology, which is categorized to the area of the radio convergence.

History of 4G and pre-4G technologies

In 2002, the strategic vision for 4Gwhich ITU designated as IMT-Advancedwas laid out.In 2005, OFDMA transmission technology is chosen as candidate for the HSOPA downlink, later renamed 3GPP Long Term Evolution (LTE) air interface E-UTRA.In November 2005, KT demonstrated mobile WiMAX service in Busan, South Korea.[28]

In June 2006, KT started the world's first commercial mobile WiMAX service in Seoul, South Korea. [2]

In mid-2006, Sprint Nextel announced that it would invest about US$5 billion in a WiMAX technology buildout over the next few years[29] ($5.45 billion in realterms[30]). Since that time Sprint has faced many setbacks, that have resulted in steep quarterly losses. On May 7, 2008, Sprint, Imagine, Google, Intel, Comcast,Bright House, and Time Warner announced a pooling of an average of 120 MHz of spectrum; Sprint merged its Xohm WiMAX division with Clearwire to form acompany which will take the name "Clear".

In February 2007, the Japanese companyNTT DoCoMo tested a 4G communication system prototype with 4x4 MIMO calledVSF-OFCDM at 100 Mbit/s while moving,and 1 Gbit/s while stationary. NTT DoCoMo completed a trial in which they reached a maximum packet transmission rate of approximately 5 Gbit/s in the downlinkwith 12x12 MIMO using a 100 MHz frequency bandwidth while moving at 10 km/h, [31] and is planning on releasing the first commercial network in 2010.

[32]
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In September 2007, NTT Docomo demonstrated e-UTRA data rates of 200 Mbit/s with power consumption below 100 mW during the test.In January 2008, a U.S. Federal Communications Commission (FCC) spectrum auction for the 700 MHz former analog TV frequencies began. As a result, the biggestshare of the spectrum went to Verizon Wireless and the next biggest to AT&T.[33] Both of these companies have stated their intention of supporting LTE.In January 2008, EU commissionerViviane Reding suggested re-allocation of 500800 MHz spectrum for wireless communication, including WiMAX.[34]

February 15, 2008 - Skyworks Solutions released a front-end module for e-UTRAN. [35][36][37]

In April 2008, LG and Nortel demonstrated e-UTRA data rates of 50 Mbit/s while travelling at 110 km/h. [38]In December 2008, San Miguel Corporation, Asia's largest food and beverage conglomerate, has signed a memorandum of understanding with Qatar Telecom QSC(Qtel) to build wireless broadband and mobile communications projects in the Philippines. The joint-venture formed wi-tribe Philippines, which offers 4G in thecountry.[39] Around the same time Globe Telecom rolled out the first WiMAX service in the Philippines.In 2008, ITU-Restablished the detailed performance requirements of IMT-Advanced, by issuing a Circular Letter calling for candidate Radio Access Technologies

(RATs) for IMT-Advanced.[40]

April 2008, just after receiving the circular letter, the 3GPP organized a workshop on IMT-Advanced where it was decided that LTE Advanced, an evolution of currentLTE standard, will meet or even exceed IMT-Advanced requirements following the ITU-R agenda.On 12 November 2008, HTC announced the first WiMAX-enabled mobile phone, the Max 4G[41]

On 3 March 2009, Lithuania's LRTC announcing the first operational "4G" mobile WiMAX network in Baltic states.[42]In December 2009, Sprint began advertising "4G" service in selected cities in the United States, despite average download speeds of only 36 Mbit/s with peakspeeds of 10 Mbit/s (not available in all markets). [43]On December 14, 2009, the first commercial LTE deployment was in the Scandinavian capitals Stockholm and Oslo by the Swedish-Finnish network operatorTeliaSonera and its Norwegian brandname NetCom (Norway). TeliaSonera branded the network "4G". The modem devices on offer were manufactured by Samsung(dongle GT-B3710), and the network infrastructure created by Huawei (in Oslo) and Ericsson (in Stockholm). TeliaSonera plans to roll out nationwide LTE acrossSweden, Norway and Finland.[4][44] TeliaSonera used spectral bandwidth of 10 MHz, and single-in-single-out, which should provide physical layer net bitrates of upto 50 Mbit/s downlink and 25 Mbit/s in the uplink. Introductory tests showed a TCPthroughput of 42.8 Mbit/s downlink and 5.3 Mbit/s uplink in Stockholm.[5]

On 25 February 2010, Estonia's EMT opened LTE "4G" network working in test regime. [45]

On 4 June 2010, Sprint Nextel released the first WiMAX smartphone in the US, the HTC Evo 4G.[46]On July 2010, Uzbekistan's MTS deployed LTE in Tashkent.[47]On 25 August 2010, Latvia's LMT opened LTE "4G" network working in test regime 50% of territory.On 6 December 2010, at the ITU World Radiocommunication Seminar 2010, the ITU stated that LTE, WiMax and similar "evolved 3G technologies" could beconsidered "4G".[6]

On 12 December 2010, VivaCell-MTS launches inArmenia 4G/LTE commercial test network with a live demo conducted inYerevan.[48]

Deployment plans

In May 2005, Digiweb, an Irish fixed and wireless broadband company, announced that they had received a mobile communications license from the Irish Telecomsregulator, ComReg. This service will be issued the mobile code 088in Ireland and will be used for the provision of 4G Mobile communications.[49][50] Digiweb launched amobile broadband network using FLASH-OFDM technology at 872 MHz.

On September 20, 2007,Verizon Wireless announced plans for a joint effort with theVodafone Group to transition its networks to the 4G standard LTE. On December 9,2008, Verizon Wireless announced their intentions to build and begin to roll out an LTE network by the end of 2009. Since then, Verizon Wireless has said that they willstart their rollout by the end of 2010.

On July 7, 2008, South Korea announced plans to spend 60 billion won, or US$58,000,000, on developing 4G and even 5G technologies, with the goal of having thehighest mobile phone market share by 2012, and the hope of an international standard. [51]

Telus and Bell Canada, the major Canadian cdmaOne and EV-DO carriers, have announced that they will be cooperating towards building a fourth generation (4G) LTEwireless broadband network in Canada. As a transitional measure, they are implementing 3G UMTS that went live in November 2009.[52]

Sprint offers a 3G/4G connection plan, currently available in select cities in the United States. [43] It delivers rates up to 10 Mbit/s.

In the United Kingdom,Telefnica O2is to use Slough as a guinea pig in testing the 4G network and has called upon Huawei to install LTE technology in six masts acrossthe town to allow people to talk to each other via HD video conferencing and play PlayStation games while on the move.[53]
http://en.wikipedia.org/wiki/Federal_Communications_Commissionhttp://en.wikipedia.org/wiki/Spectrum_auctionhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/Viviane_Redinghttp://en.wikipedia.org/wiki/San_Miguel_Corporationhttp://en.wikipedia.org/wiki/Qtelhttp://en.wikipedia.org/wiki/Globe_Telecomhttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/High_Tech_Computerhttp://en.wikipedia.org/w/index.php?title=Max_4G&action=edit&redlink=1http://en.wikipedia.org/wiki/Mobile_WiMAXhttp://en.wikipedia.org/wiki/Stockholmhttp://en.wikipedia.org/wiki/Oslohttp://en.wikipedia.org/wiki/TeliaSonerahttp://en.wikipedia.org/wiki/NetCom_(Norway)http://en.wikipedia.org/wiki/Samsunghttp://en.wikipedia.org/wiki/Huaweihttp://en.wikipedia.org/wiki/Ericssonhttp://en.wikipedia.org/wiki/Net_bitratehttp://en.wikipedia.org/wiki/Transmission_Control_Protocolhttp://en.wikipedia.org/wiki/Throughputhttp://en.wikipedia.org/wiki/EMT_(mobile_operator)http://en.wikipedia.org/wiki/Sprint_Nextelhttp://en.wikipedia.org/wiki/HTC_Evo_4Ghttp://en.wikipedia.org/wiki/Uzbekistanhttp://en.wikipedia.org/wiki/Mobile_TeleSystemshttp://en.wikipedia.org/wiki/Tashkenthttp://en.wikipedia.org/wiki/Latviahttp://en.wikipedia.org/wiki/Latvian_Mobile_Telephonehttp://en.wikipedia.org/wiki/ITUhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/WiMaxhttp://en.wikipedia.org/wiki/Armeniahttp://en.wikipedia.org/wiki/Yerevanhttp://en.wikipedia.org/wiki/Digiwebhttp://en.wikipedia.org/wiki/ComReghttp://en.wikipedia.org/wiki/Verizon_Wirelesshttp://en.wikipedia.org/wiki/Vodafone_Grouphttp://en.wikipedia.org/wiki/South_Koreahttp://en.wikipedia.org/wiki/South_Korean_wonhttp://en.wikipedia.org/wiki/Telushttp://en.wikipedia.org/wiki/Bell_Canadahttp://en.wikipedia.org/wiki/CdmaOnehttp://en.wikipedia.org/wiki/EV-DOhttp://en.wikipedia.org/wiki/UMTShttp://en.wikipedia.org/wiki/United_Kingdomhttp://en.wikipedia.org/wiki/Telef%C3%B3nica_Europehttp://en.wikipedia.org/wiki/Telef%C3%B3nica_Europehttp://en.wikipedia.org/wiki/Telef%C3%B3nica_Europehttp://en.wikipedia.org/wiki/Sloughhttp://en.wikipedia.org/wiki/Huaweihttp://en.wikipedia.org/wiki/Huaweihttp://en.wikipedia.org/wiki/Sloughhttp://en.wikipedia.org/wiki/Telef%C3%B3nica_Europehttp://en.wikipedia.org/wiki/Telef%C3%B3nica_Europehttp://en.wikipedia.org/wiki/United_Kingdomhttp://en.wikipedia.org/wiki/UMTShttp://en.wikipedia.org/wiki/EV-DOhttp://en.wikipedia.org/wiki/CdmaOnehttp://en.wikipedia.org/wiki/Bell_Canadahttp://en.wikipedia.org/wiki/Telushttp://en.wikipedia.org/wiki/South_Korean_wonhttp://en.wikipedia.org/wiki/South_Koreahttp://en.wikipedia.org/wiki/Vodafone_Grouphttp://en.wikipedia.org/wiki/Verizon_Wirelesshttp://en.wikipedia.org/wiki/ComReghttp://en.wikipedia.org/wiki/Digiwebhttp://en.wikipedia.org/wiki/Yerevanhttp://en.wikipedia.org/wiki/Armeniahttp://en.wikipedia.org/wiki/WiMaxhttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/ITUhttp://en.wikipedia.org/wiki/Latvian_Mobile_Telephonehttp://en.wikipedia.org/wiki/Latviahttp://en.wikipedia.org/wiki/Tashkenthttp://en.wikipedia.org/wiki/Mobile_TeleSystemshttp://en.wikipedia.org/wiki/Uzbekistanhttp://en.wikipedia.org/wiki/HTC_Evo_4Ghttp://en.wikipedia.org/wiki/Sprint_Nextelhttp://en.wikipedia.org/wiki/EMT_(mobile_operator)http://en.wikipedia.org/wiki/Throughputhttp://en.wikipedia.org/wiki/Transmission_Control_Protocolhttp://en.wikipedia.org/wiki/Net_bitratehttp://en.wikipedia.org/wiki/Ericssonhttp://en.wikipedia.org/wiki/Huaweihttp://en.wikipedia.org/wiki/Samsunghttp://en.wikipedia.org/wiki/NetCom_(Norway)http://en.wikipedia.org/wiki/TeliaSonerahttp://en.wikipedia.org/wiki/Oslohttp://en.wikipedia.org/wiki/Stockholmhttp://en.wikipedia.org/wiki/Mobile_WiMAXhttp://en.wikipedia.org/w/index.php?title=Max_4G&action=edit&redlink=1http://en.wikipedia.org/wiki/High_Tech_Computerhttp://en.wikipedia.org/wiki/ITU-Rhttp://en.wikipedia.org/wiki/Globe_Telecomhttp://en.wikipedia.org/wiki/Qtelhttp://en.wikipedia.org/wiki/San_Miguel_Corporationhttp://en.wikipedia.org/wiki/Viviane_Redinghttp://en.wikipedia.org/wiki/3GPP_Long_Term_Evolutionhttp://en.wikipedia.org/wiki/Spectrum_auctionhttp://en.wikipedia.org/wiki/Federal_Communications_Commission


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Verizon Wireless has announced that it plans to augment its CDMA2000-based EV-DO 3G network in the United States with LTE.AT&T, along with Verizon Wireless, haschosen to migrate toward LTE from 2G/GSM and 3G/HSPA by 2011.[54]

Sprint Nextel has deployed WiMAX technology which it has labeled 4G as of October 2008. It is currently deploying to additional markets and is the first US carrier to offera WiMAX phone.[55]

The U.S. FCC is exploring the possibility of deployment and operation of a nationwide 4G public safety network which would allow first responders to seamlesslycommunicate between agencies and across geographies, regardless of devices. In June 2010 the FCC released a comprehensive white paper which indicates that the10 MHz of dedicated spectrum currently allocated from the 700 MHz spectrum for public safety will provide adequate capacity and performance necessary for normalcommunications as well as serious emergency situations. [56]

TeliaSonera started deploying LTE (branded "4G") in Stockholm and Oslo November 2009 (as seen above), and in several Swedish, Norwegian, and Finnish cities during2010. In June 2010, Swedish television companies used 4G to broadcast live television from the Swedish Crown Princess' Royal Wedding.[57]

Safaricom, a telecommunication company in East& Central Africa, began its setup of a 4G network in October 2010 after the now retired& Kenya Tourist Board Chairman,Michael Joseph, regarded their 3G network as a white elephant i.e. it failed to perform to expectations. Huawei was given the contract the network is set to go fullycommercial by the end of Q1 of 2011

Telstra announced on 15 February 2011, that it intents to upgrade its current Next G network to 4G with Long Term Evolution (LTE) technology in the central businessdistricts of all Australian capital cities and selected regional centres by the end of 2011. [58]

Beyond 4G research

Main article: 5G

A major issue in 4G systems is to make the high bit rates available in a larger portion of the cell, especially to users in an exposed position in between several basestations. In current research, this issue is addressed by macro-diversity techniques, also known as group cooperative relay, and also by beam-division multiple access.[59]

Pervasive networks are an amorphous and at present entirely hypothetical concept where the user can be simultaneously connected to several wireless accesstechnologies and can seamlessly move between them (See vertical handoff, IEEE 802.21). These access technologies can be Wi-Fi, UMTS, EDGE, or any other futureaccess technology. Included in this concept is also smart-radio (also known as cognitive radio technology) to efficiently manage spectrum use and transmission power aswell as the use ofmesh routing protocols to create a pervasive network.

See also

0G1G2G3G

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