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Nhm 7
on Minh Tun
Phm Ch Tm
Nguyn Phc Ph
Giang Lm Pht
Trn Mnh Sang
L Phc Sang
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Th no ltrm BTS ?
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Trc ht ta s xem hnh nh thc t ca 1 trm BTS:
y Ta thy trong hnh c cctm panel mu trngphn ra3 hng khc nhau gi
lsectorca anten .anten sectorcng l anten, ni chnh xcth n l anten nh
hng.Vi loi BTS dng 3 sectorth mt anten ph 120 ,
nu l BTS dng 6 sector thmt anten ph 60 . Nichung tu thuc vo
vngph ca anten m lp t
hay nhiu sector.
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Trc ht ta s xem hnh nh thc t ca 1 trm BTS:
y Ta thy tng u l antendng cho GSM bng tn
900MHZtng th 2 anten dng cho 3G
(UTMS)
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Cu to 1 sector
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CU TRC CA MT TRM THU PHT GC BTS
y Bao gm mt chc nng iu khin mt trm gc (BCF:BS Control Function)
v t 1 n 16 my thu pht (TRX:Transceiver) chc nng iu khin trm gc thc
hin
nhim v qun l phn mn v iu khin cc chc nngkhai thc v bo dng trong
trm gc.
y My thu cha b lc thu lc tn hiu nhiu v ly ra tnhiu thu hu ch,
sau tn hiu thu c bin i vo
trung tn b bin i h tn ri a n x l bng gcthu (my thu khng i tn tn
hiu c a thng nkhi ny). x l bng gc thu tn hiu c ly mu vlng t bib
ADC.
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y B cn bng x l mo m gy ra do truyn a tia.B giiiu ch ly ra lung s
v a n n khiphn knh. khiny c n nh ccphn khc nhau ca lung s n cckhe
thi gian v cc knh logic khc nhau tng ng vi cc
MS khc nhau.y B CODEC knh gii m knh lungbit thu c cc knh
logic khc nhau v quyt nh nu l knhbo hiu th gin khi bo hiu cn nu
l s liu hay ting th gi n
CODEC ting.CODEC cng thc hin v pht hin v sali.Nu li khng sa c th
khung hngb loib. C thc hai trng hp i vi CODEC ting:
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y CODEC ting c t ngay ti BTS th s liu tingc chuyn i vo tc
13kbps.
y Nu n c t BSC thbo hiu trongbng cb sung thnh 16kbps trc khipht
n BSC giaodin Abis.
y CODEC ting thc hin chuyn i lung s 13kbpsvo 104kbps sao vo
64kbps ng ln. ngxung 64kbps c chuyn i 13kbps ri c an CODEC knh.
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y Mypht c ccb lc ra loib cc tn s gy nhiucho cc dch v v tuyn khc
N cng thc hin iu khinmc cng sut r a ty theo nhm cng sut ca BS v
nuiu khin cng sut c thc hin BS th c th thit lp
mc cng sut khc nhau cho tng khe thi gian.y B tng hp m bo cung cp
tn s cho ccphn khc
nhau ca BTS thng thngb ny c ngb vi ngh ca BSC.i khi c th c ng h
ring
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8/2/2019 TRM BTS 3G
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y Khibo hiu giao din logic gia mng v cc MS cho ccbn tin iu
khin.Rt nhiu bn tin bo hiu c truyntrong sut qua BS, cc bn tin ny c
i qua CODECknh n MS trong trng hp ny BTS khng c nhim v
no khc ngoi vic sp xp ng cc s liu ny giao dinUm.Mt s ccbn tin
BTS a n khi iu khin xl. Cc bn tin ny bao gm: Mt m ha v nhy tn.Ccbn
tin khai thc v bo dng ch a n chc nng iu
khin v chng khng lin quan g n hot ng bnhthng ca MS.
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y Khi iu khin thc hin cc nhim v iu khin bntrong BS tr n cs ccbn
tin khai thc v bo dng an t BSC.Tt c cc bn tin ny c a qua giao
dinAbis
y Chc nng ca khi lp khun cm b sung thm cc chuihng dn v ccbit ui
cho cc khi con c m ha tCODEC knh.Sau khi ghp knh thc hin sp xp cccm
vo khe thi gian tng ng v tng trm di ng. Khiiu ch thc hin iu ch tn
hiu vo sng mang v tuynv y l qu trnh tng t nn cn cb DAC.
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y - Qun l link truyn dn Abis (ln n 2 giao din Abis).-To xung ng
h cho tt c cc modul BTS
-Thc hin chng nng vn hnh v bo dng cho BTS-Qun l ghp cc d liu
TCH, RSL, OML, QMUX-iu khin chc nng AC/DC khi chng c tch hp bntrong
BTS
-iu khin ngun (dung lng, in p, nhit )
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CU TRC CA TRM BTS ALCATEL
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Chc nng ca tng khi trong BTS
y 1/ CHC NNG CA KHI SUMA:
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y 2/CHC NNG CC KHI TRONG TRE:
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y A. TREDH thng TRED chu trch nhim vphn s ca TRE:
+ X l iu khin v bo hiu,n chu trch nhimqun l cc chc nng O&M
ca TRE.+Ghp knh,nhy tn, mt mv gii mt m.+ Mho.
+ Gii iu ch (DEM).
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y B. TREAiu ch+ iu khinv bin icao tn phn pht+ ng b phn pht
+ Bin i trung tn phn thu.+ ng b phn thu+ Gii iu ch trung tn+ TRE
PA board bao gm b khuch icng
sut,n m nhim khuch icng sut tnhiu caotn bi.
y C. TREP: Cungcp nguncho TRE (DC/DC)
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y 3/ Chcnngca khi ANC
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y Modul ny bao gm 2 cu trcgingnhau, micu trcbao gm:
Antenna: ncchcnng l pht sng ra mi trngv tuynv thu sng t my di ng
pht n.Filter: Lc b tnhiu khngcn thit.
Mt khi duplexer: dng kt hp haihng pht v thumt antenna.
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y Mt khi LNA: khinycchcnngkhuch i tnhium antenna thu c ln mc ln
cho TRE c thx l c.Haikhi Spliter: khinycchcnng tch tnhiu thuca 2
TRE.WBC: (Wide band combiner) b nycchcnngkthp hai ng pht livinhau i
trncng mt
ng n b duplexer. Thc t ta ch dng b nykhi tadnghn 2 TRX trncng mt
sector,nu khng dngkt hp th ta phigcu ra v kt ni trc tip viduplexer
m khng thngqua b WBC.Khiqua b WBCtnhiu s b suyhao l 3.3dBm.
