de t d d T

Long-term evo­lu­tion (lte) tech­nol­ogy will change the way we con­nect and com­mu­ni­cate. Read on to find out when and how

Electronics For You - - WIRELESS - The au­thor is work­ing as an as­sis­tant pro­fes­sor at M.S. Ra­ma­iah School of Ad­vanced Stud­ies, Ben­galuru, and pur­su­ing PH.D in wire­less net­works from Coven­try Univer­sity, UK

Though LTE is pop­u­larly called the 4d wire­less com­mu­ni­ca­tion tech­nol­ogy, it is not the name of a tech­nol­ogy. Long-term evo­lu­tion or LTE is a Third den­er­a­tion mart­ner­ship mro­ject (3dmm).

3dmm is a col­lab­o­ra­tion be­tween groups of telecom­mu­ni­ca­tion as­so­ci­a­tions. It has given us well-known tech­nolo­gies like global sys­tem for mo­bile com­mu­ni­ca­tions (dSM), gen­eral packet ra­dio ser­vice (dmRS), en­hanced data rates for dSM evo­lu­tion (EDdE), univer­sal mo­bile telecom­mu­ni­ca­tion sys­tem (UMTS), high-speed packet ac­cess (HSmA), and re­cently LTE and LTE Ad­vanced (LTE-A).

The project on LTE started in Novem­ber 2004, with an aim to en­hance 3dmm’s al­ready ex­ist­ing UMTS by sim­pli­fy­ing the ex­ist­ing hy­brid cir­cuitswitchedL­packet-switched core net­work with a packet-only core net­work. This helps in achiev­ing higher data rates lead­ing to higher through­put, lower la­tency lead­ing to lower de­lay or faster data trans­fer, lower com­mu­ni­ca­tion cost and en­hanced sys­tem ef­fi­ciency. The re­quire­ments for LTE or sys­tem ar­chi­tec­ture evo­lu­tion are re­duced cost per bit, re­duced power con­sump­tion by ter­mi­nals, flex­i­ble use of new or ex­ist­ing fre­quency bands, and sim­pli­fied net­work ar­chi­tec­ture.

LTE is bound to be ef­fec­tive for both the con­sumers and the ser­vice provider­sL­op­er­a­tors. It prom­ises to pro­vide data rates of up to 100 Mbps for down­link and 50 Mbps for uplink, within a cell of 5km ra­dius. The num­ber of users that can be sup­ported within the cell can vary from 200 to 400. Chan­nel band­widths can vary from 1.4 MHz to 20 MHz in both uplink and down­link. LTE also claims to sup­port mo­bil­ity speeds of up to 350 kmph with in­ter-cell soft han­dovers. It prom­ises high per­for­mance for mo­bile speeds of up to 120 kmph and func­tional sup­port for speeds of 120 kmph to 350 kmph. Sup­port for 350 kmph to 500 kmph is un­der con­sid­er­a­tion. Since LTE has evolved from al­readyex­ist­ing 3d tech­nolo­gies, op­er­a­tors can up­grade the ex­ist­ing in­fras­truc­ture to sup­port LTE, which will prove to be eco­nom­i­cal and ef­fi­cient for the op­er­a­tors.

How will LTE change the way we com­mu­ni­cate?

It is easy to ob­serve the dif­fer­ence that LTE is go­ing to make in our daily lives. With sup­port for high data rates, high mo­bil­ity speeds and soft-han­dover, we would be able to have voice and video chats on the move apart from at­tend­ing to of­fi­cial work on the In­ter­net. LTE will also prove use­ful in in­fo­tain­ment and telem­at­ics ap­pli­ca­tions.

When is LTE ar­riv­ing in In­dia?

Ac­cord­ing to the lat­est news up­dates, In­dia will use 2.3 dHz of the spec­trum for time-di­vi­sion LTE (TD-LTE). The broad­band wire­less ac­cess spec­trum auc­tion for TD-LTE has been won by op­er­a­tors in­clud­ing Re­liance, Air­tel, Air­cel and Tikona and chip man­u­fac­turer Qual­comm. Swedish tele­com equip­ment maker Eric­s­son has won the LTE net­work in­fras­truc­ture and man­age­ment deal in In­dia with In­dian tele­com com­pany Augere Hold­ings award­ing the contract to Eric­s­son. Tele­com op­er­a­tor Air­cel and tele­com equip­ment maker Huawei have an­nounced com­ple­tion of their field tri­als of LTE-TDD in 2011. sery re­cently, mo­bile hand­set man­u­fac­turer Nokia has an­nounced that it is ready to sup­port LTE when it ar­rives in In­dia.

do­ing by the pre­dic­tions of in­dus­try ex­perts, by mid-2012, LTE dataen­abled de­vices may be launched in the mar­ket and by 2013-15 we may get LTE- based In­ter­net tele­phony ser­vices on smart­phones. Bharti Air­tel has al­ready launched 4d LTE ser­vices in Ben­galuru and Kolkata. This high­speed wire­less broad­band net­work is based on TD-LTE.

With all the ben­e­fits that LTE would pro­vide, In­dia is wait­ing to brace LTE for bet­ter con­nec­tiv­ity.

(ImagG EourtGsy: www.fiGrEGtGlGEom.Eom)

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