BTS Ericsson - RBS2206

BTS Ericsson - RBS2206

1. Mt s c im c bn

- Loi thit b: cng ngh GSM, t indoor (dng lp t trong phng kn), h tr ti a 12 TRX/1t.

- Mc d c kch thc tng ng vi t RBS2202 nhng c dung lng gp i v s dng b thu pht v b kt hp kp (double capacity transceiver and combiners).

Hnh 1. Dng thit b RBS 2000

- Khi thu pht kp c k hiu l dTRU c cng kch thc vi TRU n nhng cha ti 2 b thu pht (TRU = Transceiver Unit).

- dTRU dng trong t RBS2206 c kh nng h tr EDGE (cng ngh di ng th h 2,5G tip theo ca GPRS) p ng gii php giao tip s liu vi tc cao. RBS 2206 c kh nng h tr EDGE trn c 12 b thu pht.

- RBS2206 s dng 2 loi b kt hp mi (combiner) rt linh hot, do 1 t RBS2206 th hot ng vi cu hnh 1 sector, 2 sector hoc 3 sector, c th s dng kt hp bng tn GSM900/1800, GSM800/1900 hay GSM800/1800.

+ Khi s dng b kt hp lc (filter combiner, k hiu: CDU-F) th RBS2206 h tr hot ng mt trong cc cu hnh l 3x4 (4/4/4), 2x6 (6/6) v 1x12 (Omni12) s dng cc bng tn GSM900 v 1800.

+ CDU-G combiner c th c cu hnh theo 2 ch : ch dung lng v ch vng ph. Khi hot ng ch vng ph, cng sut ti u ra ca n tng ln 3,5 dB v rt hiu qu vi cc site c vng ph sng l nng thn, ngoi hoc khi bt u cung cp dch v cho mt khu vc mi vi chi ph thp nht. hot ng vi cu hnh 4/4/4 ta phi s dng 3 khi CDU-G.

2. Cu trc t RBS 2206

1 t RBS 2206 bao gm cc khi sau:

n v cp ngun PSU (power supply unit)

n v chuyn mch phn phi DXU (Distribution switch unit)

M un phn phi trong IDM (Internal distribution module)

B thu pht kp dTRU (double transceiver unit)

B phn hon chuyn cu hnh CXU (Configuration switch unit)

B phn phn phi v kt hp CDU (Combiner and Distribution unit)

n v u ni in xoay chiu v mt chiu ACCU/DCCU (AC or DC connection unit)

Khi iu khin qut FCU (Fan control unit)

B lc in mt chiu (DC Filter)

Hnh 2. RBS2206

2.1. Khi cp ngun PSU

- PSU bin i in p ca ngun cp sang in p tiu chun ca h thng l +24VDC.

- PSU c th hot ng theo cu hnh c d phng N+1 (N khi phc v v 1 khi d phng).

- Nu s dng c quy d phng th nn dng thm 1 PSU m rng phc v vic np c quy. Nu RBS c gn 1 PSU d phng ri th khng cn thm PSU m rng np ACCU.2.2. Khi chuyn mch phn phi DXU

- DXU cung cp kh nng giao tip ca h thng RBS2206 vi cc ng truyn 2Mbit/s hoc 1,5Mbit/s v cung cp cc kt ni theo tng khe thi gian ti chnh xc tng TRX.

- DXU c nhim v tch tn hiu mang thng tin ng b h thng t ng truyn PCM v dng tn hiu ny kch hot b phn pht tn hiu nh thi chun cho RBS.

- DXU h tr tnh nng ghp knh lp LAPD, chc nng hi t lp LAPD (LAPD concentration) v chc nng Multi Drop.

Hnh 3. Khi DXU-21

- 1 t RBS 2206 c 1 khi DXU-21 vi cc c im sau:

+ C 4 cng truyn dn (c E1 v T1)

+ Phn cng sn sng h tr chc nng EDGE trn c 12 TRX

+ H tr 1 mng v tuyn ng b vi s tr gip ca 1 giao din giao tip vi 1 b thu tn hiu GPS (H thng nh v ton cu) bn ngoi.

+ H tr ng b TG

2.3. M un phn phi trong IDM

IDM gm 2 chc nng:

- Phn phi in p h thng 24VDC ti cc b phn ca t RBS v ng vai tr l 1 cu ch vi in p ti l 24VDC

2.4. Khi thu pht kp dTRU

Mi t RBS2206 c th gn ti a 6 dTRU (tng ng vi 12 TRX)

Hnh 4. Khi dTRU

C nhiu loi dTRU khc nhau c phn bit bi bng tn hot ng v kh nng h tr EDGE. Tt c cc loi dTRU u h tr v phn cng cho cc chc nng HSCSD v GPRS, ring EDGE dTRU h tr v phn cng nng cp ln cc chc nng ECSD v EGPRS.

dTRU h tr nhiu chun m ho khc nhau. dTRU c th s dng chun A5/1 hoc A5/2. Qu trnh m ho c iu khin thng qua phn mm.

2.5. Khi chuyn mch cu hnh CXU

Nhim v ca CXU l kt ni cho gia CDU v dTRU ti ng thu. CXU gip vic nng cp hoc cu hnh li mt t RBS c thun tin, hn ch vic di chuyn hoc thay th cp RX.

Hnh 5. Khi CXU

Cc u vo v ra RX trn dTRU v CDU c t nhng v tr ti thiu ho s loi cp c s dng kt ni gia CXU vi dTRU/CDU.

2.6. Khi kt hp v phn phi CDU

CDU kt hp cc tn hiu c pht i t cc TRX v phn chia cc tn hiu m n thu c t anten.

Cc b lc song cng c t bn trong CDU. Mt b ni o c (measuring coupler) t bn trong CDU cung cp cc php o cng sut ti v cng sut phn x phc v vic tnh ton h s sng ng in p VSWR.

C 2 loi CDU khc nhau dng cho GSM 900 v 1800 (CDU-F v CDU-G) v mt loi CDU dng cho GSM 800 v GSM 1900 (CDU-G)

+ CDU-G c tnh nng ghp lai h tr nhy tn bng c bn v nhy tn kt hp.

+ CDU-F c tnh nng kt hp lc h tr cc cu hnh ln h tr nhy tn bng c bn. CDU-F c ti u ho cho cc cu hnh ln vi cng sut u ra ti a trn s lng anten ti thiu.

Hnh 6. Khi CDU-G v CDU-F

Cc b lc song cng cho php c ng thu ln ng pht kt ni ti cng mt anten. Cc cu hnh song cng cng cho php gim thiu s lng anten v feeder cn thit cng nh hn ch suy hao ti cc b kt hp trn ng truyn.

C CDU-G v CDU-F u sn sng v phn cng h tr EDGE.

2.7. n v kt ni in xoay chiu, mt chiu ACCU/DCCU v b lc in mt chiu DC Filter

- ACCU/DCCU dng phn chia v kt ni in p cung cp 120-250 VAC (ACCU) hay -48/-60 VDC (DCCU) ca ngun vo ti cc PSU.

- B lc in 1 chiu dng kt ni b cp ngun vo +24 VDC (PSU) vi b cquy d phng.

Khi ACCU d phng ch c khi in p ngun cung cp l 120-250VDC.

2.8. n v iu khin qut

Khi FCU iu khin cc qut gi bn trong t thit b. Mi trng lm vic bn trong t c duy tr trong mt khong gii hn ca nhit nh vo vic iu khin cc qut gi. Mi trng lm vic c iu khin bi DXU thng qua FCU vi s h tr ca cc b cm bin nhit t bn trong cc khi RU.

2.9. Khi khuch i TMA (Tower Mounted Amplifier)

Mi b khuch i nhiu ti thiu TMA l mt la chn c th c s dng theo yu cu b li suy hao do anten - feeder v tng cng hiu nng cho tt c cc b thu. Vi mi cu hnh, CDU-G v CDU-F u sn c cc b TMA song cng kp nh l mt tnh nng la chn. h tr cc b khuch i TMA, trong cc t BTS cn c thm cc b phn l m - un iu khin TMA v cc b phun in th hiu dch (Bias injector). B phun in th hiu dch c s dng cung cp cho khi TMA in nng 1 chiu t khi TMA-CM ri a ln feeder v tuyn cao tn.

2.10. n v phn ti anten (ASU - Antenna Sharing Unit)

ASU l mt b phn mi, c tch hp sn v l mt tnh nng la chn cho GSM 800 v GSM 1900. ASU c d nh h tr chc nng phn ti anten gia chun TDMA 850 v GSM 800 hoc gia TDMA 1900 v GSM 1900. Ti ng thu, tn hiu c a t anten i qua feeder ti ARP (antenna reference point- im tham chiu anten) ca t RBS 2206. Sau tn hiu c lc, ri c khuch i ti khi CDU. Ti u ra RX ca CDU, tn hiu c a ti ASU v ti y mt phn nh ca tn hiu c a ti u vo RX ca khi x l trung tm ca RBS.

3. c im k thut ca t RBS 2206

- L t c dng dng cho trm indoor (lp t trong nh)

- H tr ti a 6 n v thu pht kp (tng ng 12 TRX) trn 1 t.

- Vi mt t, ta c th thit lp c cu hnh hot ng ca trm l 1 sector, 2 sector hoc 3 sector

- T RBS 2206 p ng c cc yu cu k thut v a chn

- Ca t c th xoay sang tri hoc sang phi

Hnh7. T RBS 2206

K thut vin d dng thao tc vi cc khi chc nng t pha mt trc ca t. Khng c bt c thao tc no vi cc khi chc nng i hi k thut vin phi thc hin t mt tri, phi hay pha sau ca t, iu ny cho php chng ta c th t cc t st cnh nhau vi mt sau st tng m vn m bo thao tc k thut mt cch d dng, li va tit kim din tch.

Cc cng vo ca feeder, cp truyn dn, v cp in cung cp ngun u c t ti nh t.

ACCU d phng c t bn ngoi t RBS 2206. Cc ACCU d phng c t trong cc t ngun lp ngoi ca Ericsson vi thi gian lu tr khc nhau.

3.1. Cc thng s k thut

3.1.1. Cc thng s c hc

Thit b rng mt trc (mm) rng mt bn (mm)Chiu cao

T c lp khung 6004001850

T khng c khung 6004001800

3.1.2. Trng lng

Thit bTrng lng (kg)

T gn y cc khi card v c lp khung 230

3.1.3. Cc yu cu v ngun in

Cc ngun cung cp m bo yu cu

- (48/60) VDC

+24 VDC

120-250 VAC

3.1.4. Cng sut tiu th

in nng tiu th ti a ca RBS2206 l 3855 W (i vi ngun cung cp l 120 - 250 VAC)

Nu dng c ACCU d phng th in nng tiu th ACCU np y c th ln n mc tm thi l 5780 W.

Cc thng s trn c tnh trong ch hot ng vi mc ti ti a vi iu kin tiu chun. S tiu th in nng trong qu trnh hot ng cn tu thuc vo cu hnh trm.

3.1.5. Cc cnh bo ngoi

RBS 2206 cung cp cc im kt ni cho cc cnh bo ngoi. Cc cnh bo ngoi c nh ngha bi ngi s dng v c thng bo ti BSC thng qua h thng bo hiu lp LAPD trn giao din Abis O&M.

C tng cng l 16 loi cnh bo ngoi. Cc cnh bo ngoi ny c nh ngha bng cch s dng h thng u cui vn hnh v bo dng (OMT - Operation and Maintenance Terminal) hoc h thng OMT t xa.

3.1.6. Qu trnh np d phng ACCU

Cc ACCU d phng c bn trong cc t ngun lp ngoi (ging kiu t SAFT ca Alcatel), c tn l BBS 2000, vi cng kch thc nh t RBS 2206, thi gian chu ti khi mt in ln ti 8 ting.

Bn trong t BBS 2000 c mt n v cu ch ACCU c gi l BFU (Battery Fuse Unit). BFU c chc nng gim st, ni hoc ngt h thng khi ACCU khi in p tt thp ti mt mc nht nh. C th cung cp ngun in cho thit b truyn dn bn ngoi vi in p h thng +24 VDC. in p ny c th c cung cp t t RBS hoc ACCU d phng.

C th chia s ACCU d phng gia RBS 2206 v RBS 2202/200.