Get Ready for 900MHz Refarming

8/16/2019 Get Ready for 900MHz Refarming

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Get ready for 900MHz refarming900MHz refarming: A growing trend

A UMTS network can be constructed in the GSM900 frequency band at aower cost with better co!erage than a UMTS"#00 network$

According to radio wa!e %ro%agation features& radio signas are transmitted

farther at a ower carrier frequency and aow one site to co!er a wider area$

This makes the UMTS900 an e'ceent wide co!erage soution$ Therefore&

in!estment for mobie networks goes down as wider co!erage %er site means

fewer sites$

Second& the UMTS900 network is better for indoor co!erage and has better

network co!erage %erformance$ (ow)frequency carrier signas su*er ess oss

when %enetrating buiding was$ Thus& with a UMTS900 network quaity of

ser!ice +,oS- is im%ro!ed and better user e'%erience enabed$

.hen constructing a UMTS900 network& o%erators can %rotect their

in!estment in the origina GSM network by reusing infrastructures ike the

antenna and site$

Howe!er& due to imited s%ectrum resources on the GSM900 band& most

o%erators cannot %ro!ide a com%ete /MHz frequency band to buid the

UMTS network$ n addition& the e'isting GSM900 network has accumuated a

arge subscriber base and is an im%ortant source of %ro1ts for o%erators$ This

is why the GSM2UMTS 900MHz refarming soution was %ro%osed in the ho%e

of constructing ow)cost UMTS900 networks with wide co!erage and

im%ementing 3oint networking between UMTS and GSM networks whie

ensuring the continuous ca%acity e'%ansion and ,oS of the GSM network$

4ue to the ad!antages of a UMTS900 network& increasingy more countries

ha!e begun to formuate %oicies reguating the de%oyment of 5G networks

on the 900MHz band$


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The 6U %assed a new resoution on 7uy "8& "009& a%%ro!ing refarming the

900MHz band and requested that its member countries enforce the bi

within si' months to dri!e the de!eo%ment of the 5G mobie

communications industry$ 900MHz o%erators can utiize the frequency for any

technoogy& at their own discretion& without icense restrictions$

SingleRAN based refarming solutions

.hen %erforming 900MHz refarming& o%erators need to address the foowing

four key issues #- The interference between GSM and UMTS networks must

be minimized: "- ;eeder and Antenna sharing to %rotect e'isting in!estment:

5- Guarantee of GSM network ca%acity enhancement and continuous

de!eo%ment: 6?$

As a eading @e't Generation Mobie @etwork soutions %ro!ider& Huawei has

aunched inno!ati!e SingeA@ soutions based on


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n the site sharing scenario& interference between GSM and UMTS networks is

reduced& and o%erators do not ha!e to construct new sites& sa!ing money on

au'iiary equi%ment$ By ad3usting the transmitted %ower of the UMTS

network& the GSM co!erage area and that of UMTS networks may be

basicay the same$ .hen antennas are not shared& by ad3usting the downtit

ange and azimuth& each network can achie!e the best co!erage

%erformance$

The Huawei SingeA@ based 900MHz refarming soutions can e*ecti!ey

meet the site sharing requirements for GSM2UMTS 3oint networking$ Aso& the

GSM and UMTS networks can use the same ; modue through software

u%grades and cut equi%ment costs$

Ad!a"ent fre#uen"$ guard band solution

Huawei SingeA@ based frequency refarming soutions mainy su%%ort two

ty%es of frequency aocation edge)ty%e and sandwich)ty%e aocation$

;requency ga% +f#- between the GSM band edge and the center of the UMTS

band can be con1gured based on the ga% requirement of the %roduct$ ;or f"&

the frequency ga% with other carrierCs band must be no ess than "$DMHz$ fess than "$DMHz& the other carrierCs GSM network& gi!en its unknown ;

%erformance& may interfere with the UMTS network& es%eciay when the

system is used on the Broadcast Eontro Ehanne +BEEH- or >acket 4ata

Ehanne +>4EH-$ Since the %ower contro is disabed& more interference wi

be generated on the UMTS$

;or the frequency ga% f#& Huawei SingeA@ based 900MHz refarming

soutions su%%ort a minimum bandwidth of "$


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;igure " +see >4;- shows the sandwich)ty%e GSM2UMTS frequency aocation$

.ithin the carrierCs frequency band& the UMTS frequency is %aced in the

midde& with GSM frequency band on its two sides$ The frequency ga%

between the center of UMTS and the GSM on its two sides& is equa and can

be con1gured based on the ga% requirement of the %roduct$

f f# and f" are equa and both are ess than "$DMHz& the frequency bands on

two sides of the UMTS can share s%ectrum resources with the GSM system$

Eom%ared with edge)ty%e aocation& this method doubes the number of the

GSM carrier s%ectrums$

According to sandwich)ty%e aocation& the UMTS carrier s%ectrums can be

%aced anywhere within the s%ectrum of the o%erators +not necessariy the

center of the s%ectrum-$ This can be determined based on the o%eration

strategies of the o%erators$ ;or e'am%e& the carrier may s%it some

s%ectrums in the future to obtain " UMTS bands& which can reduce

subsequent UMTS frequency ad3ustments$

;or the frequency ga% of f# and f"& Huawei SingeA@ based 900MHz

refarming soutions su%%ort a minimum bandwidth of "$


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;or this %ur%ose& Huawei has de!eo%ed an inno!ati!e co)frequency bu*er

zone soution& reso!ing co)frequency interference between two systems$ The

soution has been %ut into successfu commercia use by =%tus in Austraia$

(ringing multi)le *alues

HuaweiCs SingeA@ based 900MHz refarming soutions bring !aue in four

ma3or ways

;irst& they o%timize the ; 1ter of base stations and use an ad!anced

agorithm to %ro!ide frequency refarming soutions for sma frequency

s%acing in !arious scenarios minimizing the im%act of the UMTS900 on

e'isting GSM by making fu use of scarce 900MHz frequency resources$

Second& by ado%ting S4 technoogy& Huawei SingeA@)based 900MHz

refarming soutions enabe the GSM and UMTS to out%ut signa on one %ower

am%i1er and share antennas naturay& reducing the network construction

costs$

Third& with the Huawei SingeA@ based 900MHz frequency refarming

soutions& GSM and the UMTS networks are fuy integrated on the same

hardware %atform$ Eo)M +co)radio resources management-& Eo)=FM +Eo)

o%eration F maintenance-& and Eo)@>2@= +Eo)radio network

%anning2radio network o%timization- are reaized with software&

consoidating the two inde%endent networks to aow users to en3oy high)end

"G and 5G ser!ices without a hitch$

By using GSM2UMTS Eo)M& radio resources of !arious standards can be

e'iby aocated& with channe aocation& %ower contro and hando!er %oicy

under !arious standards o%timized based on ser!ice and ca%acity

requirements to ma'imize the utiization of radio resources$

.ith GSM2UMTS Eo)=FM& a uni1ed o%eration F maintenance interface&

con1guration contro commands& as we as normaized measurement re%orts


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and statistics re%orts can reduce the com%e'ity and cost of maintenance$

.ith the GSM2UMTS Eo)@>2@= too& %anning and o%timization of the GSM

and UMTS networks can be carried out in a uni1ed way to im%ro!e the

accuracy of network %anning& and boost construction of high)quaity

networks& whie reducing maintenance costs$

;ourth& the im%ro!ement of network %erformance and the sustainabe

de!eo%ment of the GSM network can be assured$

Huawei has inde%endenty de!eo%ed a series of technoogies for

interference %re)eimination and interference reduction$ They can e*ecti!ey

im%ro!e network %erformance& increase network ca%acity& enhance s%ectrum

utiization eciency& im%ro!e user e'%erience and increase re!enues$

Eonsequenty& the ca%acity and quaity of the GSM network can be im%ro!ed

des%ite imited s%ectrum resources$

The tight frequency reuse soution from Huawei& together with the o%timized

channe aocation %oicy& can e*ecti!ey reduce and su%%ress network

interference& increase system ca%acity by u% to o!er "00I with imited

frequency resources and guarantee !oice quaity of the entire network$ This

is es%eciay he%fu in scenarios with ow network ca%acity& high trac and

an insigni1cant im%ro!ement from frequency ho%%ing$

%ommer"iall$ mature en*ironment

Three !endors in the industry& incuding Huawei& ha!e successfuy

de!eo%ed a commercia UMTS900 network$ So far& Huawei has constructed

and reeased more than three GSM9002UMTS900 S4 commercia networks$

Ten UMTS900 networks in the industry ha!e been %ut into successfucommercia use and at east D0 UMTS900 networks are being %anned or

de%oyed in "0#0$

Termina !endors are s%eeding u% the F4 and manufacturing of UMTS900

terminas$ According to a sur!ey by Goba mobie Su%%iers Association


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+GSA-& 5< termina !endors in the word ha!e reeased #90 UMTS900)HS>A

terminas& incuding ##J UMTS900)HS>A mobie terminas and 59 USB

donges$ outers& >E cards and buit)in modues that su%%ort the UMTS900

ha!e aso been commerciay reeased and a UMTS900 terminas su%%ort

GSM264G6 functions$

n 6uro%e& Midde 6ast& Africa and the Asia >aci1c region& the UMTS900 is

becoming a standard termina frequency$

Growing mobie broadband ser!ice demands& dereguation of teecom

%oicies on 900MHz& as we as the aunch of a arge number of terminas

means that increasingy more UMTS900 frequency refarming networks wi be

o%erationa$

;or the frequency ga% f#& Huawei SingeA@ based 900MHz refarming

soutions su%%ort a minimum bandwidth of "$

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Get Ready for 900MHz Refarming