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Time- Di vi sion Long - Ter m Evol uti on - Wi ki pedi a, the fr ee encyclopedi a
Time-Division Long-Term Evolution From Wik ipedia, ipedia, the free encyclopedia
(Redirected (Redirected from TD-LTE) Time-Division LongLong-Te Term rm Evolution (TD-LTE), also referred to as Long-Term Evolution Time-Division [1] is a 4G 4G mobilemobile-teleco telecomm mmun unications ications technology te chnology and standard standard co-developed, since late Duplex (LTE TDD),[1] 2007, by Datang Telecom, China Mobile, Huawei, ZTE, Nokia Siemens Networks, Alcatel Shanghai Bell, citation needed n eeded ] Qualcomm, ST-Ericsson, Leadcore, etc.[citation It is one of two variants of the 3GPP Long Term Evolution (LTE) technology, the other being Frequency-Divis Frequency-Division ion Long-Term Evolution (FD-LTE or LTE FDD). Likewise, TD-LTE-Advanced is an LTE LTE Adv Advanced time-division time-division variant, an evolutionar y upgrade version of TD-LTE.
Contents 1 History 2 Deployments and coverages 3 Technical highlights 4 Equipment/component availability 5 References 6 External links
History History The TD-LTE project was approved on 26 December 2007, at the state council executive meeting of the New Generation Generation Broadband Broad band Wireless Mob Mobiile Comm C ommuni unicat catiion Networks, along with TD-SCDMA.[2]
eployments and coverages In early early 2011, China China Mobile invested invested CNY 1.5 billion on the '6+1 Scheme', S cheme', in which large large-scale -scale TD-LTE field tr ial ial was condu conducted in 6 citi cities es inclu includin ding Shanghai, Guangzhou Guangzhou, Shenzh Shenzhen, en, Hangzhou, Hangzhou, N anjing, anjing, and a nd Xiamen.[3] Each of the cities deployed around 500 TD-LTE femtocell base-stations. A demonstration network was set up in Beijing. In Taiwan, China Mobile built a TD-LTE network in Taipei, for testing purposes purposes for for the the local local GSM operator Far EasTone, . [4] As of September 2011, China Mobile has sealed agreements with 32 international telecom carriers, for launching 27 TD-LTE trial networks. [5] On 10 April 2012, Airtel launched 4G services using TD-LTE technology in Kolkata, becoming the first company in India to offer 4G services. Since the initial launch, Airtel also launched 4G in Bangalore, Pune and Chandigarh.[6] On 30th December 2012, Dialog Axiata launched Fixed 4G services using TD-LTE technology in Sri Lanka. Sri Lanka's first & only Fixed 4G LTE Broadband operator is Dialog. en.wiki pedia.or g /wiki /TD- LTE
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Time-Division Long-Term Evolution - Wikipedia, the free encyclopedia
Technical highlights TD-LTE transmissions travel in both directions on the same frequency band, a methodology formally known as "unpaired spectrum." It is distinct from "paired spectrum," where two frequencies are allocated, one for the transmit channel and the other for the receive channel (formally called "Frequency Division"). "Time Division" means the receive channel and the transmit channel take turns (i.e. divide the time between them) on the same frequency band. The time divisions are asymmetric, meaning that more time-slots are allocated to data going from the tower to the phone than from the phone to the tower.[7] The usage patterns of the future (fewer phone calls, more Internet) are asymmetric in this manner. The frequency bands used by TD-LTE are 3.4–3.6 GHz in Australia [8] and UK,[9] 2.57−2.62 GHz in the US [10] and China,[11] 2.545- 2.575 GHz in Japan,[12] and 2.3–2.4 GHz in India [13] and Australia.[8] The technology supports scalable channel bandwidth, between 1.4 and 20 MHz.[14] A typical range is up to 200 metres (660 ft) indoors on a 2.57–2.62 GHz radio frequency link. [15]
Equipment/component availability Vendors that announced end- user support include Nokia and ZTE. Nokia announced a TD-LTE/FDLTE/HSPA+/TD-SCDMA/EDGE multi-mode netbook based on the ST-Ericsson M7400 MPSoC. [16] ZTE announced V2, a TD-LTE/TD-SCDMA/GSM multi-mode dual-standby smartphone.[17] Apart from the ST-Ericsson M7400 MPSoC mentioned above, other vendors which announced chipset support include Innofidei, which together with the Hong Kong Applied Science and Technology Research Institute announced the Warp drive 5000, a TD-LTE/FD-LTE dual-mode baseband processor [18] and Sequans Communications which announced the SQN3010, a similar chip. [19] The following TD LTE Tablets and Phones have also been announced in China [20] HTC TD 101:[21] LTE 2500-2690 MHz LG Optimus Vu 2 Plus: TD-LTE Frequencies unknown ZTE U9810:[22] LTE 2100 (#1), LTE 1800 (#3), LTE 2600 (#7), TD-LTE 1900 (#39), TD-LTE 2300 (#40), TD-LTE 2500 (#41) ZTE V9800: LTE 2300(#40), LTE 2600 (#7) Huawei Ascend D2 TL: TD-LTE Frequencies unknown Acer TD-LTE Tablet:[23] 2300 MHz (#40), 2600 MHz (#38) Some models of the Apple iPhone 5c and iPhone 5s will also support TD-LTE. Both Qualcomm and nVidia have announced TD-LTE microchips Qualcomm WTR1625L (RF360 software): 40 LTE frequency band transceiver [24] nVidia Tegra 4i (i500 software): TD-LTE frequency Bands 33 to 41 [25]
References en.wikipedia.org/wiki/TD-LTE
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