rbs 2202 va rbs 2206

CHNG 2

PHAN II:THIET B RBS 2202 VA RBS 2206

CHNG 1

TONG QUAN VE MANG GSM

1.1. Gii thieu:

Mang vien thong to ong la mot trong cac ng dung ky thuat vien thong co nhu cau ln nhat va phat trien nhanh nhat. GSM (Global system for mobile communication he thong thong tin di ong toan cau) vi tieu chuan thong so toan Chau Au mi, se giai quyet s han che dung lng hien nay. Thc chat dung lng se tang 2 3 lan nh viec s dung tan so tot hn va ky thuat o nho, do vay so thue bao phuc vu se tang len.

Lu ong la hoan toan t ong, ban co the em may di ong cua mnh khi i du lch va s dung mot nc khac. He thong se t ong cap nhat thong tin ve v tr cua ban cho he thong tai nha ban. Ban cung co the goi i va nhan cuoc goi en ma ngi goi khong can biet v tr cua ban. Ngoai tnh lu ong quoc te, tieu chuan GSM con cung cap mot so tnh nang nh thong tin toc o cao, faxcimile va dch vu thong bao ngan. Cac may ien thoai di ong se ngay cang nho hn va tieu thu t cong suat hn cac the he trc chung.

Tieu chuan GSM c thiet ke e co the ket hp vi ISDN va tng thch vi moi trng di ong. Nh vay tng tac gia hai tieu chuan nay c am bao.

Nam 1982 GSM bat au phat trien khi cac nc Bac Au gi e ngh en CEPT e quy nh mot dch vu vien thong chung Chau Au bng tn 900 MHz.

T nam 1982 en nam 1985 ngi ta ban luan ve viec xay dng mot he thong so hay tng t. Nam 1985 quyet nh he thong so. Bc tiep theo la chon la giai phap bang hep va bang rong.

Nam 1986 mot cuoc kiem tra ngoai hien trng a c to chc tai Paris cac hang khac nhau a ua tai vi cac giai phap cua mnh.

Thang 05/1987 giai phap TDMA bang hep c la chon, ong thi cac hang khai thac a ky bien ban ghi nh MoU(Memorandem of Understanding) thc hien cac quy nh a ha se co 1 GSM van hanh vao 01/07/91.

Ecrisson co be day kinh nghiem trong viec thiet ke va san xuat he thong to ong. He thong CME20 cho GSM c thiet ke tren c s chuyen mach so AXE10. nc ta co ba he thong ien thoai di ong GSM la VMS Mobifone, Vinaphone va Vietel.

Ve chat lng: Chc nang au tien cua CME20 la cung cap mot dch vu ien thoai di ong tin cay va chat lng tot. Cac the he may di ong khac nhau cung s dung nhieu loai dch vu so lieu mi khong can mot modem rieng.

GSM viec ang ky thue bao c ghi modun nhan dang thue bao SIM (Subscribe Identity Module) co kch thc nh mot tam tn phieu. Ban co the cam card thue bao cua mnh vao loai may GSM va ch mnh s dung no. He thong se kiem tra viec ang ky thue bao ung va card khong b lay cap. Qua trnh nay c t ong thc hien bang mot thu tuc nhan thc thong qua mot trung tam nhan thc.

Tnh bao mat cung c tang cng nh viec s dung mot ma so e ngan chan hoan toan viec nghe trom vo tuyen.

ieu kien tng oi tot, chat lng tieng GSM ngang bang vi he thong tng t. Tuy nhien, cac ieu kien toi do tn hieu yeu hay do nhieu giao thoa nang, GSM co chat lng tot hn.

Viec s dung cong nghe mi lam cac may ien thoai di ong nho va nhe hn, s dung che ong ngh t ong lam cho tuoi tho ac qui dai hn.1.2. Cac thong so ky thuat cua mang GSM:

GSM 900:

Tan so : Uplink: 890MHz 915MHz

Downlink: 935MHz 960MHz Khoang cach duplex : 45MHz

Khoang cach gia hai kenh ke can : 200KHz.

Phng thc truy nhap : TDMA.

So kenh cho mot tan so: 8 kenh.

Phng phap ieu che : GMSK (Gaussian Minimum Shift Keying).

GSM 1800:

Tan so :

Uplink: 1710MHz 1785MHz

Downlink: 1805MHz 1880MHz Khoang cach duplex : 95MHz

Khoang cach gia hai kenh ke can : 200KHz.

Phng thc truy nhap : TDMA.

So kenh cho mot tan so: 8 kenh.

Phng phap ieu che : GMSK (Gaussian Minimum Shift Keying).

1.3. Cac bo phan chnh trong he thong GSM:

Hnh 1. 1: Cau hnh mang GSM.c chia lam 3 phan he:

Phan he chuyen mach SS.

Phan he tram goc BSS.

Phan he khai thac bao dng OSS.

1.3.1. Phan he chuyen mach SS (Switch System) :

He thong con chuyen mach bao gom cac chc nang chuyen mach chnh cua GSM cung nh c s d lieu can thiet cho so lieu thue bao va quan ly di ong cua thue bao. Chc nang chnh cua SS la quan ly thong tin gia nhng ngi s dung mang GSM vi nhau va vi mang khac.

1.3.1.1. MSC: (Mobile service Swiching Center):

SS chc nang chuyen mach chnh c MSC thc hien, nhiem vu chnh cua MSC la ieu phoi viec thiet lap cuoc goi en nhng ngi s dung mang GSM. Mot mat MSC giao tiep vi he thong con BSS, mat khac giao tiep vi mang ngoai. MSC lam nhiem vu giao tiep vi mang ngoai goi la MSC cong (GMSC). Viec giao tiep vi mang ngoai e am bao thong tin cho nhng ngi s dung mang GSM oi hoi cong thch ng (cac chc nang tng tac IWF: interworking function). SS cung can giao tiep vi mang ngoai e s dung cac kha nang cua cac mang nay cho viec truyen tai so lieu cua ngi s dung hoac bao hieu gia cac phan t cua mang GSM. Chang han SS co the s dung mang bao hieu kenh chung so 7 (CCS No), mang nay am bao hoat ong tng tac gia cac phan t cua SS trong mot hay nhieu mang GSM.

MSC thng la mot tong ai ln ieu khien tram goc (BSC). Mot tong ai MSC thch hp cho mot vung o th va ngoai o co dan c vao khoang mot trieu (vi mat o thue bao trung bnh).

e ket noi MSC vi mot so mang khac can phai thch ng vi cac ac iem truyen dan cua GSM vi cac mang nay. Cac thch ng nay c goi la cac chc nang tng tac (IWF: interworking function) bao gom mot thiet b e thch ng giao thc va truyen dan. No cho phep ket noi vi cac mang: PSPDN (mang so lieu cong cong chuyen mach goi) hay CSPDN (mang so lieu cong cong chuyen mach kenh), va cung ton tai khi cac mang khac ch n thuan la PSTN hay ISDN.

1.3.1.2. HLR (Home Location Register) :

Ngoai MSC, SS bao gom cac c s d lieu. Cac thong tin lien quan en viec cung cap cac dch vu vien thong c lu gi HLR khong phu thuoc vao v tr hien thi cua thue bao. HLR cung cha cac thong tin lien quan en v tr hien thi cua thue bao. Thng HLR la mot may tnh ng rieng khong co kha nang chuyen mach nhng co kha nang quan ly hang tram ngan thue bao. Mot chc nang con cua HLR la nhan dang trung tam nhan thc AUC ma nhiem vu cua trung tam nay quan ly an toan so lieu cua cac thue bao c phep.

1.3.1.3. VLR (Visitor Location Register):

VLR la c s d lieu th hai trong mang GSM. No c noi mot hay nhieu MSC va co nhiem vu lu gi tam thi so lieu thue bao cua cac thue bao hien ang nam trong vung phuc vu cua MSC tng ng mc o chnh xac hn HLR. Cac chc nang VLR thng c lien ket vi cac chc nang MSC.

1.3.1.4. AUC (Authentication Center):

Nham bao ve mang chong b s dung trai phep bang cach s dung bo ba RAND, SRES, Kc.

Nhng thu tuc ma AUC thc hien e tao bo 3 bao gom:

Tao mot so ngau nhien RAND.

RAND va Ki cung vi thuat toan A3 tao ra so SRES (Signed Respone) va tao ra khoa mat ma Kc thong qua thuat toan A8.

RAND, SRES va Kc c phan phoi ti HLR

1.3.2. Phan he BSS (Base Station System):

Hnh 1. 2: Cac giao dien ngoai BSS.

Hnh 1. 3: Cac phan t cua BSS

NSS: Mang va he thong con chuyen mach

BSS: He thong con tram goc

OSS: He thong con khai thac

MS: Tram di ong

Co the noi BSS la mot he thong cac thiet b ac thu rieng cho cac tnh chat to ong vo tuyen cua GSM. BSS giao dien trc tiep vi cac tram di ong (MS) thong qua giao dien vo tuyen, v the no bao gom cac thiet b phat va thu ng vo tuyen va quan ly cac chc nang nay. Mat khac BSS thc hien giao dien vi cac tong ai SS. Tom lai BSS thc hien au noi cac MS vi cac ngi s dung vien thong khac. BSS cung phai c ieu khien va v vay no c au noi vi OSS.

1.3.2.1. BTS (Base Transceiver Station):

Mot BTS bao gom cac thiet b phat thu, anten va x ly tn hieu ac thu cho giao dien vo tuyen. Co the coi BTS la cac modem vo tuyen phc tap co them mot so cac chc nang khac. Mot bo phan quan trong cua BTS la TRAU (Transcoder and rate adapter unit: khoi chuyen oi ma va thch ng toc o). TRAU la thiet b ma o qua trnh ma hoa va giai ma tieng ac thu rieng cho GSM c tien hanh, ay cung thc hien thch ng toc o trong trng hp truyen so lieu. TRAU la mot bo phan cua BTS, nhng cung co the at no cach xa BTS va tham ch trong nhieu trng hp c at gia cac BSC va MSC.

1.3.2.2. BSC (Base Station Controller):

BSC co nhiem vu quan ly tat ca giao dien vo tuyen cua BTS va MS thong qua cac lenh ieu khien t xa. Cac lenh nay chu yeu la cac lenh an nh, giai phong kenh vo tuyen va quan ly chuyen giao (handover). Mot pha BSC c noi vi BTS con pha kia noi vi MSC cua SS. Trong thc te BSC la mot tong ai nho co kha nang tnh toan ang ke. Vai tro chu yeu cua no la quan ly cac kenh giao dien vo tuyen va chuyen giao (handover). Mot BSC trung bnh co the quan ly ti vai chuc BTS phu thuoc vao lu lng cua cac BTS nay. Giao dien gia BSC vi MSC c goi la giao dien A, con giao dien gia no vi BTS c goi la giao dien Abis.

1.3.2.3. MS (Mobile Station):

Tram di ong la thiet b duy nhat ma ngi s dung co the thng xuyen nhn thay cua he thong. MS co the la thiet b at trong o to, thiet b xach tay hoac thiet b cam tay. Loai thiet b cam tay la thiet b tram di ong pho bien nhat. Ngoai viec cha cac chc nang vo tuyen chung va x ly cho giao dien vo tuyen MS con phai cung cap cac giao dien vi ngi s dung (nh: micro, loa, man hien th, ban phm e quan ly cuoc goi) hoac giao dien vi mot so thiet b khac (nh: giao dien vi may tnh ca nhan, fax). Hien nay ngi ta ang co gang san xuat cac thiet b au cuoi gon nhe e au noi vi tram di ong. Viec la chon cac thiet b au cuoi hien nay e m cho cac nha san xuat, ta co the liet ke ba chc nang chnh:

Thiet b au cuoi thc hien cac chc nang khong lien quan en mang GSM: Fax.

Ket cuoi tram di ong thc hien cac chc nang lien quan en truyen dan giao dien vo tuyen.

Bo thch ng au cuoi lam viec nh mot ca noi thong thiet b au cuoi vi ket cuoi di ong. Can s dung bo thch ng au cuoi khi giao dien ngoai tram di ong tuan theo tieu chuan ISDN, con thiet b au cuoi lai co giao dien au cuoi modem.

Hnh 1. 4: Cau truc chc nang cua tram di ong.

1.3.3. Phan he khai thac va bao dng OSS:

Hnh 1. 5: Cac phan t cua phan he OSS.

OSS thc hien ba chc nang chnh sau:

Khai thac va bao dng mang

Quan ly thue bao va tnh cc

Quan ly thiet b di ong

1.3.3.1. Khai thac va bao dng:

Khai thac la cac hoat ong cho phep nha khai thac mang theo doi hanh vi cua mang nh: tai cua he thong, mc o chan, so lng chuyen giao (handover) gia 2 o, nh vay nha khai thac co the giam sat c toan bo chat lng cua dch vu ma ho cung cap cho khach hang va kp thi x ly cac s co. Khai thac cung bao gom viec thay oi cau hnh e giam nhng van e xuat hien thi iem hien thi, chuan b tang lu lng trong tng lai e tang vung phu. Viec thay oi mang co the thc hien mem qua bao hieu (chang han thay oi thong so handover e thay oi bien gii tng oi gia 2 o), hoac thc hien cng oi hoi s can thiep tai hien trng (chang han bo sung them dung lng truyen dan hay lap at mot tram mi). he thong vien thong hien ai khai thac c thc hien bang may tnh va c tap trung mot tram.

Bao dng co nhiem vu phat hien, nh v va sa cha cac s co, hong hoc. No co mot so quan he vi khai thac. Cac thiet b mang vien thong hien ai co kha nang t phat hien mot so s co hay d bao s co thong qua t kiem tra. Trong nhieu trng hp ngi ta d phong cho thiet b e khi co s co co the thay the bang thiet b d phong. S thay the nay ch co the thc hien t ong, ngoai ra viec giam nhe s co co the c ngi khac thc hien bang ieu khien t xa. Bao dng cung bao gom cac hoat ong tai hien trng nham thay the thiet b co s co.

He thong khai thac va bao dng co the c xay dng tren nguyen ly TMN (Telecommunication Management Network: mang quan ly vien thong). Mot mat he thong khai thac va bao dng c noi en cac phan t cua mang vien thong (cac MSC, BSC, HLR va cac phan t mang khac tr BTS, v tham nhap en BTS c thc hien qua BSC), mat khac lai noi en mot may tnh chu ong vai tro giao tiep ngi may theo tieu chuan GSM goi la OMC (Operation and Maintenance Center: trung tam khai thac va bao dng).

1.3.3.2. Quan ly thue bao:

Bao gom cac hoat ong quan ly ang ky thue bao. Nhiem vu au tien la nhap va xoa thue bao khoi mang. ang ky thue bao cung co the rat phc tap bao gom nhieu dch vu va cac tnh nang bo sung. Nha khai thac co the tham nhap c tat ca cac thong so noi tren. Mot nhiem vu quan trong khac cua khai thac la tnh cc cac cuoc goi. Quan ly thue bao mang GSM ch lien quan en HLR va mot so thiet b OSS rieng chang han mang noi HLR vi cac thiet b giao tiep ngi may cac trung tam giao dch vi thue bao. Sim card cung ong vai tro nh mot bo phan cua he thong quan ly thue bao.

1.3.3.3. Quan ly thiet b di ong:

Quan ly thiet b di ong c bo ang ky nhan dang thiet b EIR (Equipment Idnetity Register) thc hien. EIR lu gi tat ca cac gi lieu lien quan en tram di ong MS. EIR c noi en MSC qua ng bao hieu e kiem tra s c phep cua thiet b.

CHNG 2

THIET B RBS 2202 VA RBS 2206 CUA ERICSSON

2.1. V tr va chc nang cua RBS trong mang GSM:

Tram goc vo tuyen RBS bao gom cac thiet b vo tuyen va truyen dan. Ericsson cung cap 2 ho RBS: RBS 200 va RBS 2000. Moi RBS hoat ong tren 2 tan so, mot dung cho tn hieu phat ti MS va mot dung cho tn hieu nhan t MS.

2.1.1. V tr:

Hnh 2. 1: V tr cua RBS trong mang GSM.

RBS giao tiep vi BSC qua giao dien A-BIS va giao tiep vi MS qua giao dien vo tuyen.

2.1.1.1. Giao dien A-BIS:

Chu trach nhiem truyen dan lu lng va thong tin bao hieu gia BSC va RBS. Giao thc truyen dan c s dung cho viec truyen thong tin bao hieu la LAPD (Link Access Protocol on the D Channel).

Hnh 2. 2: Giao tiep A-BIS gia RBS va BSC2.1.1.2. Giao dien vo tuyen:

S dung ky thuat a tham nhap phan chia theo thi gian (TDMA) e truyen - nhan lu lng va thong tin bao hieu gia BTS va MS. Ky thuat TDMA c dung e chia moi tan so s dung thanh 8 khe thi gian, moi khe thi gian c an nh cho mot user. Ky thuat nay cho phep toi a 8 cuoc am thoai tren mot tan so.

Toc o bit: 270 kbit/s.

o rong kenh: 200 KHz.

Khoang cach gia chieu xuong va chieu len trong mot kenh la 45 MHz (GSM 900); 95 MHz (GSM 1800) va 80 MHz (GSM 1900).

Hnh 2. 3: Giao tiep vo tuyen gia RBS va MS.

2.1.2. Chc nang cua RBS:

Nguon vo tuyen : RBS ket noi ti MS qua khong gian bang viec thu phat song vo tuyen, va chu s ieu khien cua BSC.

nh cau hnh va khi ong he thong : nh cau hnh site can co cac thong so ve lu lng va hoat ong, cac thong so nay c u tien thiet lap khi khi ong he thong gom : tan so thu phat, gii han cong suat phat, so kenh logic truyen tren kenh vat ly, BSIC cho moi tram.

Truyen vo tuyen : c thc hien tren kenh vat ly, cong suat phat c ieu khien t BSC va thay oi tuy thuoc vao khoang cach t BTS ti MS. Cac thong tin he thong luon c phat vi cong suat toi a.

Nhan tn hieu : RBS phai tach ung kenh phat t MS. Trong thi gian goi, MS anh gia chat lng va o manh tn hieu, ong thi c lng thi gian tre cua tn hieu truyen ve RBS ung vi kenh a cap. Cac tham so hieu chnh thi gian va ket qua o c gi ve BSC x ly.

X ly tn hieu : RBS x ly tn hieu trc khi truyen va sau khi nhan gom: ma hoa bao mat, ma hoa kenh, ma hoa thoai, xen ke, can bang, phan tap, ieu che, giai ieu che ...

Truyen thong tin ong bo: Thong tin ong bo c truyen tren kenh SCH va thong tin hieu chnh tan so c truyen tren kenh FCCH; cho phep MS ong bo vi cau truc TDMA.

ieu kien cong suat tram goc: c thc hien e giam thieu cong suat phat cho bo thu phat cua RBS ma van gi c chat lng cua lien ket vo tuyen. ieu khien cong suat MS: nham giam thieu cong suat phat cua MS ma van gi c chat lng cua kenh vo tuyen va giam nhieu ong kenh gia cac user.

o ac kenh truyen: RBS cung cap:

Viec o ac kenh truyen theo che o tch cc: o ac chat lng va cng o tn hieu tren kenh rieng chieu len tch cc.

Viec o ac kenh truyen theo che o roi: o ac cng o tn hieu tren kenh rieng chieu len roi.

Truyen gian oan: la mot c cau cho phep tat may phat vo tuyen trong khi khong co thoai hay d lieu:

Tiet kiem nang lng theo chieu len cua MS.

Giam nhieu cua moi trng.

Giam cong suat tieu thu cua RBS theo chieu xuong.

Mat ma: RBS cung cap 2 phng thc: khong mat ma hoac s dung thuat toan mat ma GSM. BSC se kiem soat viec s dung cac phng thc nay.

Nhay tan: cai thien chat lng truyen dan tren giao dien vo tuyen bang viec giam nhieu va fading a ng. Co 2 loai nhay tan:

Nhay tan bang goc: Moi may phat se phat mot tan so va d lieu tren kenh vat ly se c phat tren cac may phat khac nhau sau moi cum.

Nhay tan tong hp: d lieu tren kenh vat ly se c phat tren cung mot may phat tai moi thi iem nhng se thay oi tan so phat sau moi cum.

Bao dng tai cho : RBS co the t van hanh va bao dng khong can s ieu khien t BSC. RBS c trang b cac en hien th trang thai va canh bao, chi tiet ve loi co the c ieu khien bang may tnh qua phan mem giao tiep LMT/OMT.

Quan ly ng bao hieu : RBS quan ly ng bao hieu LAPD gia BSC va MS.

2.2. Thiet b RBS 2202 cua Ericsson:

2.2.1. Gii thieu:

Hnh 2. 4: Tu RBS 2202 cua Ericsson.

RBS 2202 la thanh vien trong ho RBS 2000 va c at trong nha (Indoor), cau hnh cho omni-cells hay multi-cells (toi a 3 cell) vi 6 bo thu phat cho 1 cabinet, hay co the dung cau hnh multi-cabinet vi 18 bo thu phat (3 cabinet).

Kch thc tu: 1500 x 600 x 400 (mm3). Nguon cung cap: 230 VAC, -48 VDC va +24 VDC.

Trong lng tu lap ay 226 Kg:

Trong lng e: 12 Kg.

Co the cung hoat ong chung hay thay the cho RBS 200/205.

S dung cac bo phan ri nh cac RBS khac trong ho Macro RBS 2000.

c thiet ke cho hau het cac he thong ien ap thong dung.

e giam kch thc tu, tat ca cac thiet b truyen dan va nguon pin c lap ben ngoai tu. Ben trong Cabinet ch cha cac thiet b vo tuyen, thiet b cap nguon va thiet b lam mat.

Cau hnh Multicabinet (2 cabinet: master va extension) cung cap 12 may thu phat.

2.2.2. Cac khoi chc nang ben ngoai tu RBS 2202:

Anten Low Noise Amplifier (ALNA)/Tower Mounted Amplifier (TMA) ALNA/TMA c lap tren cao gan anten e cai thien o nhay thu.

Nguon pin d phong : nguon d phong dai han c cung cap bang mot ac quy khong oi.

Battery Fuse Unit (BFU) : Bo cau ch cua acquy giam sat va ket noi, ngat ket noi tuy theo mc ien ap. BFU c at tren ng ket noi ti nguon acquy va co mot BFU cho nguon pin d phong.

Control Module (CM) : Control Module c s dung e cung cap ien ap 15V DC cho toi a 6 TMAs thong qua BIAS Injector. No cung c dung e nhan dang loi TMA va chuyen thong tin nay en khoi bao hieu trong RBS. CM c at ngoai cabinet.

BIAS Injector - BIAS-IC : BIAS Injector c s dung e cung cap ien ap DC cho TMA t CM thong qua ng cap dan RX/TX. Sau BIAS-IC co the c ket noi ti cung mot CM. BIAS-IC c at cang gan ngo ra cao tan RF cang tot.

Bo chuyen oi ien ap DC/DC (tuy chon) cho Transport Module : bo nay chuyen ien ap DC t +24VDC thanh -48VDC cung cap cho Transport Module.

Dual Duplex Tower Mounted Amplifier (DDTMA) : DDTMA c at tren cot gan anten, no giup cai thien o nhay thu va tiet kiem feeder bang cach ghep tn hieu thu va phat vao chung mot ng cap. Trong dai tan GSM 900 Mhz, can co bo cap nguon BIAS Injector va CM ho tr cho DDTMA. Tai tan so GSM 1800/1900 Mhz can co mot bo ghep tn hieu.

External Duplexer : External Duplexer c s dung cho BTSs vi mot bo cap nguon TMA DC nhng cac ngo RX va TX la tach biet khi vao DDTMA.

Overvoltage Protection Module (OVP) : Thiet b chong qua ap OVP c s dung e bao ve thiet b ben trong RBS va giao dien tn hieu ngoai khoi qua ap va qua dong.

System Voltage Distribution Module (DM) : DM c s dung e phan phoi ien ap (+24VDC) ti cac thiet b phu tr qua bon ngo ra. No cap ien cho OVP, CM, TM, con mot ngo ra e d phong. au vao DM c ket noi ti ngo ra ap +24VDC trong vung ket noi.

Transport Module (TM): Co the cap nguon cho module van chuyen bang ien ap t ngoai RBS t he thong +24VDC, qua bo chuyen oi DC/DC thanh -48VDC.

2.2.3. Cac khoi chc nang ben trong tu RBS 2202:

Hnh 2. 5: V tr cac khoi chc nang trong RBS 2202.

Hnh 2. 6: S o ket noi cac RU trong RBS 2202.

RBS 2202 gom cac khoi chc nang chnh : DXU, TRU, CDU, ECU, PSU. Chung lien lac vi nhau bang cac bus chc nang:

Timing bus: mang thong tin nh thi t DXU phan phoi ti cac TRU.

CDU bus: truyen thong tin gia TRU va CDU.

X-bus: truyen thong tin gia cac TRU phuc vu cho nhay tan bang goc.

Local bus: chuyen thong tin gia DXU vi TRU, ECU.

2.2.3.1. Distribution Switch Unit - DXU:

DXU la bo x ly trung tam cua RBS. Moi RBS ch co mot DXU, trong cau hnh m rong th ch can 1 DXU tren master cabinet. Co 3 loai DXU :

DXU - 01 : s dung cho ng truyen PCM E1 (2 Mbps) khong co tham chieu tan so trong DXU.

DXU - 03 : s dung cho ng truyen PCM T1 (1.5 Mbps) co tham chieu tan so trong DXU.

DXU - 11 : s dung cho ca ng E1 va T1, khong tham chieu tan so trong DXU. Viec la chon E1 hay T1 thong qua mot cong tac tren board.

Hnh 2. 7: Mat trc va sau cua DXU trong RBS 2202.

Mat trc: nut Reset CPU, en bao loi, en bao hoat ong, en trang thai, en bao loi thiet b, en bao canh bao ngoai, nut chuyen trang thai.

Mat sau: ngo cap nguon, bus ket noi noi bo, timing bus.

a. Chc nang cua DXU:

Phan phoi tn hieu ti cac TRU, va chuyen tiep tn hieu ti RBS khac.

Tao tn hieu nh thi cho RBS (dung thong tin ong bo tach t ng PCM hay cua nguon dao ong noi).

Tap hp ti toi a 16 canh bao ngoai (phu thuoc vao san pham)

Giao tiep Local bus RS 485.

Giao tiep PCM qua G.703 (giam sat loi ng truyen).

Giao tiep OMT qua RS 232.

Quan ly nguon ng truyen A-bis.

Tap hp cac ng ieu khien (bao hieu LAPD ti BSC).

Lu tr phan mem cho toan bo RBS.

Duy tr c s d lieu ve lap at (Installation Database (IDB)) c tch hp vi DXU. IDB cha cac thong tin ve cac phan cng c lap at, nh dang thiet b, v tr va cac tham so ve cau hnh.

DXU co the thiet lap ket noi ti BSC (PCM link) va ket noi cheo tng TS ti Transceiver. BSC ieu khien DXU thong qua ng bao hieu LAPD.

b. Cac thanh phan chnh cua DXU:

Hnh 2. 8: S o khoi DXU trong RBS 2202.b.1. PCM part:

Muc ch cua PCM part la tach cac Time slots (TS) t ng A-bis va a ti TRUs qua local bus. Co the ket noi 2 ng PCM (Port A/B) ti DXU. ieu nay lam tang dung lng hoac cung cap mot o d tha tren cac ng truyen.

b.2. CPU Part:

Bo x ly trung tam thc hien cac nhiem vu :

Quan ly tai nguyen trong RBS.

Tai ve va lu tr phan mem cho cac RUs.

Giao tiep vi OMT.

Van hanh va bao dng.

Canh bao trong va ngoai.

Tach thong tin bao hieu LAPD.

b.3. CTU Part:

Bo nh thi trung tam tao ra cac xung chuan on nh cho cac TRU. Bo nh thi co the c ong bo t ng A-bis hay t bo giao ong noi 5 Mhz.

b.4. HDLC Concentrator (LAPD Concentration) :

HDLC Concentration co the ghep ti 4 TS bao hieu LAPD vao mot TS khi truyen va ngc lai luc nhan nham lam tang dung lng thoai cho cac ng PCM. HDLC Concentration oc cac thong tin ve kenh ieu khien va phan phoi ti cac TRU va CPU part (cua DXU) tng ng.

Ghep kenh LAPD ngha la cac ng bao hieu A-bis LAPD va ng lu lng c ghep lai thanh 1 ng 64 kbps. Ch co 2 PCM TS tren 1 TRU la can thiet va co ch li cho cac site t TRU.

b.5. TGSync:

Giao dien TGSync/ESB (External Synchronization Bus) c s dung e truyen tn hieu ong bo va nh thi gia hai hay nhieu RBS.

2.2.3.2. Transceiver Unit - TRU:

TRU la mot bo phan thu phat va x ly tn hieu thu va phat t tram ti MS. Co nhieu loai TRU phu hp cho tng giai tan. Mot TRU co the phuc vu cho 8 kenh truyen toan toc song cong (full rate duplex), hay 16 kenh ban toc (half rate).

Moi TRU co 1 ngo phat va hai ngo thu (phan tap).

Mat trc: nut Reset CPU, en bao loi, en bao hoat ong, en trang thai, en bao khong phat c, en bao Test, nut chuyen trang thai.

Mat sau: ngo cap nguon, bus ket noi noi bo, timing bus.

Cac loai en bao hieu:

FaultReden sang khi thiet b bao loi.

OperationalGreenen sang khi thiet b hoat ong che o local hay remote, tat khi thiet b khong hoat ong hay ang chuyen che o lam viec.

Local modeYellowTat khi thiet b chu s ieu khien t BSC, sang khi thiet b cach ly khoi BSC, nhap nhay khi chuyen trang thai.

TX not enabledYellowBao khong phat c, co the do TRU h, TX feerer h hay do CDU h.

Test resultYellow

Bang 1: Cac loai en bao trong TRU cua RBS 2202.

Hnh 2. 9: Mat trc va sau cua TRU trong RBS 2202.

a. Chc nang cua TRU:

Phat :

ieu che GMSK

Tao tan so cao tan RF

Khuyech ai cong suat

Thu :

Nhay tan bang goc hay nhay tan tong hp (Basebands hopping/synthesizer hopping

Phan tap: X ly tn hieu vo tuyen

Quan ly TRX

b. Cac thanh phan chnh cua TRU:

Hnh 2. 10: S o khoi TRU trong RBS 2202.b.1. Digital Block (TRUD):

Hoat ong nh bo ieu khien TRX. No lien lac vi cac phan khac trong RBS thong qua Local bus, CDU bus, Timing bus, va X bus. Digital Block thc hien cac qua trnh x ly tn hieu Uplink va Downlink nh : ma hoa kenh, chen xen ke, bao mat, nh dang burst va can bang.

b.2. Transmitter Block (TX-block):

Thc hien cac chc nang phat gom : ieu che GMSK, tao tn hieu cao tan RF, khuyech ai cong suat. Khi thc hien nhay tan bang goc (Baseband hoping) moi bo phat se truyen tn hieu tren cung mot tan so va d lieu kenh vat ly se c truyen t cac TX khac nhau ng vi moi burst. Trong nhay tan tong hp (Synthesiser hopping) th d lieu kenh vat ly luon c gi cung TX nhng se s dung tan so mi cho moi burst.

b.3. Receiver Block (RX-block):

Khoi nhan thc hien viec tiep nhan va giai ieu che. Co hai RX tren moi TRU. Phan thu co kha nang nhay tan.

Khi ket noi loop TX va RX ta co the kiem tra TRU thong qua viec tao tn hieu kiem tra.

2.2.3.3. Combining and Distribution Unit - CDU:

a. Chc nang cua CDU:

CDU la giao dien gia cac TRU va he thong anten. CDU cho phep nhieu TRU cung s dung chung mot anten. Cac loai CDU khac nhau c s dung cho cac loai anten khac nhau.

b. Cac thanh phan chnh cua CDU:

Hnh 2. 11: Cac thanh phan chnh trong CDU trong RBS 2202.b.1. Combiner:

Ket hp 1 so ngo ra e truyen len mot anten. Nhieu combiner co the c s dung e ket hp hai nhom may phat.

Hybrid Combiner: La thiet b bang rong cho phep moi tan so trong bang tan cua may phat i qua theo chieu phat vi suy hao ghep la 3 dB. Moi bo Hybrid combiner co the ghep 2 may phat tao thanh 1 ngo ra tren cung mot anten.

Hnh 2. 12: Hybrid combiner

Filter Combiner: la thiet b bang hep cho phep ch mot tan so trong dai tan may phat i qua vi suy hao ghep la 4 dB.

Hnh 2. 13: Filter combiner

b.2. RXDA (Receiver (RX) Divider Amplifier):

Chia tn hieu nhan c thanh nhieu mach oc lap, do o cho phep nhieu bo thu cung nhan c tn hieu t mot anten.

b.3. Duplexer:

Cho phep mot tn hieu truyen i qua mot anten va ong thi cho phep nhieu tn hieu nhan qua cung mot anten ti bo thu.

b.4. RF filter:

ay la mot bo loc thong dai (BF), cho tn hieu qua trong dai tan mong muon, loai bo tn hieu khong mong muon. No c gan ca vao au thu va au phat, tn hieu thu c loc trc khi x ly va tn hieu phat cung c loc trc khi phat len anten.

c. Cac loai CDU:

Co nhieu loai CDU khac nhau phu thuoc vao s la chon cua ngi s dung nh chi ph, dung lng, so lng anten.

CDU - A : co the ieu khien 1 - 2 TRU, dung cho cac cells dung lng thap va vung phu song rong.

CDU - C va CDU - C+ : co the ieu khien 1 - 2 TRU va co the lien ket e ieu khien ti 6 TRU. ay c xem la mot giai phap e lam giam so lng anten can dung so vi CDU - A.

CDU - D : co the ieu khien t 1 - 6 TRU. CDU - D co the c ket noi e ieu khien ti 12 TRU vi dung lng cao va la giai phap e lam giam so lng anten so vi CDU - C va CDU - C+.

c.1. CDU - A:

Hnh 2. 14: S o khoi CDU-A trong RBS 2202. CDU - A cha hai RXDA, chung c s dung e giao tiep vi hai anten rieng biet cho muc tieu phan tap.

CDU - A khong co combiner nen khong the phat cung luc nhieu tn hieu tren cung mot anten.

CDU - A bang tan 900 Mhz co hai duplexers ben trong cho phep va thu va phat tren cung mot anten, giup giam so lng anten trong cau hnh.

CDU - A bang tan 1800/1900 Mhz khong co duplexer ben trong do vay can nhieu feeder anten rieng biet cho viec thu phat tn hieu trong ca hai ng tn hieu A va B.

c.2. CDU loai C va C+:

Hnh 2. 15: S o khoi CDU-C trong RBS 2202. CDU - C cha mot RXDA e phan chia tn hieu nhan c t mot anten ti 6 TRU, can co hai CDU - C e cai thien chat lng tn hieu thu (phan tap).

Mot CDU ket noi hai ng truyen ti mot anten.

Khi s dung trong mot cabinet co 5 hoac 6 TRU (1cell) th can dung 3 CDU - C . Hai CDU - C au cung cap cac tn hieu thu cho tat ca cac TRU, CDU - C con lai dung e ket noi bo phat th nam vi th sau.

CDU - C dung bang tan 900 Mhz co bo hybrid combiner cho phep hai bo transmitter phat tn hieu tren cung mot anten, loai nay co duplexer giup giam so lng anten can dung.

CDU - C+ tng thch vi CDU - C, nhng ch co mot kieu cho moi bang tan 900/1800/1900 Mhz. Phan thu cua CDU - C+ dung hai anten thu va co them mot ng dan phu, nen mot CDU - C+ co the phan tap cho hai TRU va moi CDU - C+ co the hoat ong oc lap vi cac CDU - C+ khac.

c.3. CDU - D:

Hnh 2. 16: S o khoi CDU-D trong RBS 2202. CDU - D co kch thc vat ly gap 3 lan CDU - A, C hay C+, va lap ay mot magazin.

CDU - D gom cac phan chnh sau :

Distribution Unit - DU : quan trong nhat trong CDU - D, no x ly cac ng dan A va B ti cac TRU.

Combiner Unit - CU : ket hp hai tn hieu truyen ti bus RF, CDU - D co the ghep 1-3 CU.

Filter Unit - FU : bo loc a tn hieu t CU ti anten phat va chuyen tn hieu thu t anten ti DU. FU co duplexer goi la FUd. Vi bang tan 900 Mhz ch co FUd, bang tan 1800/1900 Mhz co ca FU va FUd. Viec co s dung duplexer hay khong la tuy y.

d. Tong ket cac loai CDU:

Bang 2: Tong ket cac loai CDU trong RBS 22022.2.3.4. Energy Control Unit - ECU:

ECU ieu khien va giam sat cac thiet b cap nguon (PSU, BFU, thiet b ket noi AC), va cac thiet b ieu khien nhiet o (quat, may say, may lanh, bo trao oi nhiet). ECU cung giam sat cac thiet b canh bao t nguon va he thong theo doi nhiet o. Muc ch cua ECU la bao ve thiet b trong RBS khoi nhng anh hng cua moi trng lam giam tuoi tho va o tin cay. ECU bao ve thiet b trong ieu kien mat nguon hay khi ong khi nhiet o thap.

Hnh 2. 17: Mat trc va sau cua ECU trong RBS 2202. Mat trc: Nut Reset CPU, en bao loi, en trang thai hoat ong, en bao s dung nguon DC, en bao ngat nguon DC, en bao mat nguon AC, cong tn hieu quang.

Mat sau: nguon cung cap, cac ket noi ieu khien nguon.

a. Chc nang cua ECU:

ieu khien cac thiet b cap nguon PSUs, BFUs, accu, va cac thiet b lam mat : quat, may say, may lanh, bo trao oi nhiet.

Khi ong lanh RBS trong pham vi cho phep.

Tach va x ly canh bao t cac thiet b giam sat.

X ly cac tn hieu cam bien tng t.

Truyen thong vi DXU qua local bus.

Ganh tai vi PSU (ch PSU 230).

Duy tr ien ap he thong e tranh accu b qua nhiet. (ch PSU 230).

b. Cac thanh phan cua ECU:

Hnh 2. 18: S o khoi ECU trong RBS 2202.b.1. CPU:

Bo x ly trung tam (CPU) co mot thanh ghi ay da tren cau truc 32 bit RISC. CPU quan ly nguon va ieu kien moi trng trong RBS, ong thi no cung am nhan :

Tai ve cac phan mem

X ly cac tn hieu canh bao va ieu khien

Quan ly cac canh bao thong qua cac giao dien quang.Bo nh : bo nh trong ECU gom bon vung s dung cac loai thiet b nh khac nhau BOOT - PROM, FPROM, DRAM(data)/DRAM(parity), EEPROM. Tat ca eu ch oc, khong the ghi.

b.2. Khoi I/O:

Cac tn hieu ngoai bao gom cac ngo ra so (tn hieu ieu khien), ngo vao so (tn hieu canh bao va giam sat), ngo ra tng t (tn hieu giam sat). Tat ca cac ngo vao va ra eu thong qua blackplane hay qua ng cap accu.

Ngo ra so c s dung e ieu khien cac thiet b ngoai vi (quat, accu, may lanh).

Ngo vao so ket noi ti cap quang c s dung e tach tn hieu canh bao trong cac thiet b ngoai vi.

Ngo vao tng t : la cac gia tr o c t cac cam bien nhiet o, o am va gia tr ien ap.b.3. Bo nguon va khi ong lanh:

Chnh lu : Mach chnh lu trong ECU la mach cau chnh lu toan song, c at trc mach khi ong lanh.

Chc nang khi ong lanh : chc nang nay am bao RBS khong khi ong khi nhiet o thap hn +5oC. Khi nhiet o nay thap hn +5oC may say c kch hoat. Khi nhiet o tren +5oC, ECU khi ong va 40 giay sau toan bo he thong c khi ong. Tuy nhien phan mem trong ECU co the khong cho he thong khi ong neu nhiet o trong tu van di mc an toan.

Bang 3: Chc nang khi ong lanh cua RBS 2202. Bo chuyen oi DC/DC : chuyen oi ien ap cung cap (nguon AC hay DC), thanh mot vai ien ap vao.

2.2.3.5. Power Supply Unit PSU:

PSU co nhiem vu bien oi cac ien ap t nguon thanh cac ien ap thch hp cap cho cac thiet b. PSU bao gom cac cong: cong vao nguon AC, cong ra nguon DC, cong tn hieu quang.

Hnh 2. 19: PCU trong RBS 2202.Co hai loai : PSU 230 va PSU -48.

PSU 230 : Chnh lu ien ap AC thanh cac mc ien ap DC can dung. ien ap xoay chieu hnh sin c a qua bo loc ngo vao, giup lam giam nhieu cao tan. Sau o tn hieu nay c cho qua bo AC/DC preregulator e chuyen thanh ien ap DC co dao ong va tang the len ti 400V DC. Tiep o bo Full Bridge chuyen tn hieu nay thanh dang song vuong 24 V AC, va dung diode chnh lu thanh ap DC. ien ap DC nay c hieu chnh bang hai thiet b ieu khien : th cap va s cap. Th cap anh gia ap ra va gi tn hieu ieu chnh ti thiet b s cap, no con quan ly ca viec lien lac vi ECU. Bo loc ngo ra chnh nhuyen tn hieu DC, giam gn song. PSU lien lac bang cap quang va c s ieu khien, giam sat cua ECU. Khi mat lien lac vi ECU, PSU van tiep tuc hoat ong vi cac gia tr ieu khien a nhan c lan cuoi cung.

PSU - 48 : chuyen oi ien ap t -48VDC ti -60VDC thanh cac mc ien ap mong muon. Tng t nh hoat ong cua PSU 230, nhng do tn hieu vao la DC, nen sau khi qua bo loc vao, tn hieu c chuyen trc tiep thanh song vuong 24V AC, va c chnh lu bang diode thanh DC.

Hnh 2. 20: S o khoi PSU 230 trong RBS 2202.

Hnh 2. 21: S o khoi PSU 48

2.2.4. Cac cau hnh cho RBS 2202:2.2.4.1. Cau hnh 1 sector:Loai CDUCau hnh nho nhat va ln nhatTu va AntenThanh phanSo tu

CDU-A1 CDU1 DXU

3 PSUs1 Cabinet

CDU-A va CDU-C+1 CDU-A

2 CDU-C+

1 DXU

4 PSUs1 Cabinet

CDU-C+1 CDU

1 DXU

3 PSUs1 Cabinet

CDU-C+2 CDUs

1 DXU

4 PSUs1 Cabinet

CDU-C+3 CDUs1 DXU

4 PSUs1 Cabinet

CDU-D1 CUs

1 DXU

4 PSUs1 Cabinet

CDU-D2 CUs

1 DXU

4 PSUs1 Cabinet

CDU-D3 CUs

1 DXU

4 PSUs1 Cabinet

CDU-D4 CUs

1 DXU

8 PSUs1 Master cabinet

1 Extension Cabinet

CDU-D5 CUs

1 DXU


1 Extension Cabinet

CDU-D6 CUs

1 DXU


1 Extension Cabinet

2.2.4.2. Cau hnh 2 sector:Loai CDUCau hnh nho nhat va ln nhatTu va AntenThanh phanSo tu

CDU-A2 CDUs

1 DXU

4 PSUs1 Cabinet

CDU-A va CDU-C+2 CDU-A

4 CDU-C+

2 DXUs

4 PSUs2 Cabinet

CDU-C+

2 CDUs

1 DXU

4 PSUs1 Cabinet

CDU-C+4 CDUs

2 DXUs

8 PSUs2 Cabinet

CDU-C+6 CDUs

2 DXUs

8 PSUs2 Cabinet

CDU-D2 CUs

2 DXUs

8 PSUs2 Cabinet

CDU-D4 CUs

2 DXUs

8 PSUs2 Cabinet

CDU-D6 CUs

2 DXUs

8 PSUs2 Cabinet

CDU-D8 CUs

2 DXUs

16 PSUs2 Master Cabinet

2 Extension Cabinet

CDU-D10 CUs

2 DXUs


2 Extension Cabinet

CDU-D12 CUs

2 DXUs


2 Extension Cabinet

2.2.4.3. Cau hnh 3 sector:Loai CDUCau hnh nho nhat va ln nhatTu va AntenThanh phanSo tu

CDU-A

3 CDUs

1 DXU

4 PSUs1 Cabinet

CDU-A6 CDUs

1 DXU


1 Extension Cabinet

CDU-A va CDU-C+

3 CDU-A

6 CDU-C+

3 DXUs

12 PSUs3 Cabinet

CDU-C+3 CDUs

1 DXU

4 PSUs1 Cabinet

CDU-C+

6 CDUs

1 DXU


1 Extension Cabinet

CDU-C+9 CDUs

3 DXU

12 PSUs3 Cabinet

CDU-D

3 CUs

3 DXU

12 PSUs3 Cabinet

CDU-D

6 CUs

3 DXU

12 PSUs3 Cabinet

CDU-D9 CUs

3 DXU

12 PSUs3 Cabinet

CDU-D12 CUs

3 DXU


3 Extension Cabinet

CDU-D15 CUs

3 DXU


3 Extension Cabinet

CDU-D15 CUs

3 DXU


3 Extension Cabinet

2.2.5. Tang giam nhom thu phat:

Cac TRU c chen vao ngan trong cabinet cac v tr khac nhau, tuy thuoc vao v tr cua CDU va so lng TRU. Vi cac loai CDU A, D va C+ (n CDU), cac TRU luon c at theo th t t trai qua phai.Khi CDU-C va CDU-C+ c s dung nh CDU-C (dung nhieu CDU), cac TRU c them vao theo th t 1, 3, 2, 4, 5 va 6.Cac th t nay la hp le cho:

Bat c mot cell nao ngay ca khi cac cell khac c dung.

Moi dai tan so.

CDU co hoac khong co duplexer.

Tiep theo ta se xem xet viec them TRU va phan chia thanh cac section theo loai CDU. Cac con so tren TRU la th t lap at, khong phai la v tr vat ly cua cac TRU trong ngan. Lu y rang mot cell c m rong bang 2 cabinet s dung CDU-C se luon luon co 2 TRU.2.2.5.1. Cau hnh:

a. CDU-A:

Hnh 2. 22: V tr cua TRU khi CDU-A v tr khac nhau trong RBS 2202.

a. CDU-A v tr 1,2 hoac 3 trong tu Master hoac tu n.

b. CDU-A v tr 1, 2 hoac 3 trong tu m rong.

b. CDU-C va CDU-C+ c dung nh CDU-C:

Hnh 2. 23: V tr cua TRU khi CDU-C co v tr khac nhau trong RBS 2202.

a. CDU-C v tr 1 va 2 trong tu Master hoac tu n

b. CDU-C v tr 2 va 3 trong tu Master hoac tu n

c. CDU-C v tr 1, 2 va 3 trong tu n

d. CDU-C v tr 3 trong tu Master va 1 trong tu m rong

e. CDU-D v tr 2 va 3 trong tu m rong.

c. CDU-C+:

c.1. Mot CDU:

Hnh 2. 24: V tr cua TRU khi CDU-C+ v tr 1,2 hoac 3 trong tu Master hoac tu n.

c.2. Nhieu CDU:

Hnh 2. 25: V tr cua TRU khi CDU-C+ cac v tr khac nhau trong RBS 2202.

a. CDU-C+ v tr 1 va 2 trong tu Master hay tu n

b. CDU-C+ v tr 2 va 3 trong tu Master hay tu n.

c. CDU-C+ v tr 1, 2 va 3 trong tu n.

d. CDU-C+ v tr 3 trong tu Master va 1 trong tu m rong.

e. CDU-C+ v tr 2 va 3 trong tu m rong.

d. CDU-D:

Hnh 2. 26: V tr cua TRU khi s dung CDU-D.

2.2.5.2. Ket noi:

a. Ket noi RF t CDU-A ti cac TRU:

Hnh 2. 27: Ket noi t CDU-A ti cac TRU.

Bang 4: Thong so cua ket noi RF t CDU-A ti cac TRU.

b. Ket noi RF t CDU-C ti cac TRU:

b.1. Cau hnh n cell:

CDU-C ti TRU 1 va 3:

Hnh 2. 28: Ket noi RF t CDU-C ti TRU 1 va 3 trong cau hnh n cell.





Bang 5: Thong so ket noi t CDU-C ti TRU trong cau hnh n cell.

b.2. Cau hnh a cell:

Co Duplexer:

Hnh 2. 31: Ket noi t CDU-C ti TRU trong cau hnh a cell co Duplex. Khong co Duplexer:

Hnh 2. 32: Ket noi t CDU-C ti TRU trong cau hnh a cell khong Duplex.

Bang 6: Cac thong so cua ket noi t CDU-C ti TRU trong cau hnh a cell.c. Ket noi RF t CDU-C+ ti cac TRU:

c.1. Mot CDU:

Hnh 2. 33: Ket noi t CDU-C+ ti TRU trong cau hnh 1 CDUc.2. Nhieu CDU:

Co Duplexer:

Hnh 2. 34: Ket noi t CDU-C+ ti TRU trong cau hnh nhieu CDU co Duplex. Khong co Duplexer:

Hnh 2. 35: Ket noi t CDU-C+ ti TRU trong cau hnh nhieu CDU khong Duplex.

Bang 7: Cac thong so cua ket noi RF gia CDU-C+ ti TRU.d. Ket noi RF t CDU-D ti cac TRU:

d.1. TRU 1 va 2:

Hnh 2. 36: Ket noi RF t CDU-D ti TRU 1 va 2.d.2. TRU 3 va 4:

Hnh 2. 37: Ket noi RF t CDU-D ti TRU 3 va 4.

d.3. TRU 5 va 6:

Hnh 2. 38: Ket noi RF t CDU-D ti TRU 5 va 6.

Bang 8: Cac thong so cua ket ni RF t CDU-D ti TRU.2.3. Thiet b RBS 2206 cua Ericsson:

2.3.1. Gii thieu:

Hnh 2. 39: Tu RBS 2206.

RBS 2206 la thiet b mi cua ho thiet b RBS 2000 cua Ericsson. RBS 2206 co the van hanh va hoat ong chung vi cac thiet b RBS khac trong ho RBS 200 hoac RBS 2000.

Trong lng tu lap ay: 230 Kg. Kch thc:Chieu ngangChieu rongChieu cao

Cabinet bao gom khung (mm)6004001850

Cabinet (mm)6004001800

Khung (mm)60040050

Bang 9: Cac thong so ve tu RBS 2206 Nguon cung cap:-(48/60) VDC; +24 VDC; 120-250 VAC. u iem cua RBS 2206 la vi cung kch thc Cabinet RBS 2202 nhng co the tang gap oi ve so lng transceiver va cac ket noi do RBS 2206 ho tr len en 6 dTRU tng ng vi 12 Transceiver cho moi Cabinet.

RBS 2206 co hai kieu ket noi mi rat uyen chuyen e hoat ong cho 1, 2 hoac 3 sector vi hai bang tan GSM 900/1800 tren cung mot cabinet. V du, ta co the cau hnh ket noi CDU-F la 3x4, 2x6 va 1x12 tren 1 cabinet. Con oi vi cau hnh ket noi CDU-G, ta co 2 loai : capacity mode va coverage mode, 2 loai ket noi nay co the thay oi linh hoat. Neu ta s dung coverage mode CDU-G, th cong suat phat i se tang len 3.5dB.

2.3.2. Cac thanh phan chnh trong tu RBS 2206:

RBS 2206 bao gom cac card sau:

Khoi cap nguon (PSU)

Module phan phoi (IDM)

Khoi ket noi nguon (ACCU/DCCU)

Bo loc DC

Bo ieu khien quat FCU

Khoi chuyen mach phan phoi (DXU)

Khoi chuyen mach cau hnh (CXU)

Khoi ket noi va phan phoi (CDU)

Khoi thu phat (dTRU)

Hnh 2. 40: V tr cac khoi chc nang trong tu RBS 2206.2.3.2.1. Power Supply Unit PSU:

Hnh 2. 41: Khoi PSU trong RBS 2206.PSU se chuyen oi nguon ien cung cap thanh ien ap cho he thong hoat ong +24 VDC. Cac PSU c at song song vi nhau side 2, va phai luon luon c cau hnh bao ve N+1.

PSU ieu khien va giam sat nguon thong qua cap ESP.

Chu y, khi s dung nguon ac qui d phong, cac PSU d phong c cung cap nguon t cac ac qui. Neu RBS c cau hnh vi PSU bao ve, PSU d phong se khong can ac qui.

2.3.2.2. Internal Distribution Module IDM:

IDM co nhiem vu cung cap ien ap +24VDC en cac bo phan khac trong Cabinet.

IDM co mot ket noi gia ESD va cac thiet b ien trong IDM.

Hnh 2. 42: Module IDM trong RBS 2206.2.3.2.3. AC Connection Unit/DC Connection Unit - ACCU/DCCU va DC Filter:

ACCU/DCCU co nhiem vu phan phoi hoac chuyen tiep ien ap cung cap 120-250 VAC (ACCU) hoac -48/-60 VDC (DCCU) en cac PSU.

Hnh 2. 43: Khoi ACCU trong RBS 2206.Bo loc DC co nhiem vu loc ien ap +24VDC t nguon cung cap va t ac qui d phong.

2.3.2.4. Fan Control Unit FCU:

FCU se ieu khien tat ca cac quat trong cabinet e bao am nhiet o trong cabinet. Bo phan do nhiet o c ieu khien bi DXU thong qua FCU vi au do nhiet o c at ben trong RUs.

Hnh 2. 44: Bo ieu khien quat trong RBS 2206.2.3.2.5. Distribution Switch Unit DXU:

Hnh 2. 45: Khoi DXU trong RBS 2206.DXU cung cap hai loai ket noi d lieu 2Mbit/s hoac 1.5 Mbit/s va co the ket noi cheo tng khe thi gian (time slots) en cac TRU. DXU cung co the lay c tn hieu ong bo t luong PCM va tao tham chieu nh thi cho RBS.

DXU cung ho tr LAPD Multiplexing, LAPD Concentration va Multi Drop. Thiet b RBS 2206 ch bao gom mot DXU-21 cho moi cabinet va co cac ac iem sau:

Cung cap 4 port truyen (E1/T1): La phan cng c chuan b e ho tr cac chc nang cua EDGE, len ti 12 may thu phat.

Cung cap mang vo tuyen ong bo nham tao giao tiep ti mot bo thu GPS ben ngoai.

Cung cap chc nang nh v di ong nham tao giao tiep ti mot LMU ben ngoai.

Co mot Flashcard co the thao ri, cho phep tai c s d lieu (IDB) mot cach nhanh chong va n gian.

Ho tr mang bus LAN vi O&M ben ngoai. Ho tr ong bo nhom thu phat TG.

Mang chc nang ECU.

Cho phep thc hien vi mang chuyen mach goi (BSS IP) va cac chc nang cua PCU nen RBS 2206 cung c s dung trong GPRS va EGPRS.2.3.2.6. Configuration Switch Unit CXU:

Nhiem vu chnh cua CXU la ket noi cheo gia CDU va dTRU trong hng ve. CXU co the m rong hoac cau hnh lai cabinet vi s di di hoac thay oi cap RX la toi thieu.

Ngo vao va ra RX tren dTRU va CDU c at v tr sao cho t ton cap nhat khi ket noi giua CXU va dTRU/CDU.

Hnh 2. 46: Khoi CXU trong RBS 2206.2.3.2.7. Combining and Distribution Unit CDU:CDU co nhiem vu ket noi nhng tn hieu truyen i t bo thu phat va phan phoi tn hieu nhan c. Bo loc song hng se at trong CDU. CDU con cho phep o c ty so song ng (VSWR- voltage standing wave ratio) theo hng ti hoac phan xa. Co 2 loai CDU c s dung trong tat ca cac cau hnh:

oi vi ket noi Hybrid, s dung CDU-G, cho phep nhay tan bang goc va nhay tan tong hp. oi vi ghep noi bo loc cho nhng cau hnh ln hn, s dung CDU-F, cho phep nhay tan bang goc. CDU-F toi u trong cau hnh va cong suat phat ln tren mot so lng nho Anten.

Hnh 2. 47: CDU-G va CDU-F trong RBS 2206.Bo loc song hng cho phep ca hai hng thu va nhan ket noi en cung mot anten. Cau hnh song hng con cho phep toi thieu hoa so lng feeder va anten s dung cung nh giam thieu c suy hao ghep tren ng truyen.

Ca hai cau hnh CDU-G va CDU-F eu co the ho tr cho EDGE.

a. CDU-G:

Cac ac iem chnh cua CDU-G: Co the len en 4 TRX tren 2 anten hoac mot anten lng cc.

Khong gii han ve bang tan.

Khoang cach kenh tan so giam xuong 400 KHz.

Ho tr nhay tan bang goc va nhay tan tong hp.

Co hoac khong co bo ghep Hybrid (trong dTRU):

Co bo ghep Hybrid: Toi a 12 TRx trong 1 cabinet c dung.

Khong co bo Hybrid: Toi a 6 TRx trong 1 cabinet c dung.

CDU-G c chuan b e cung cap 8 TRx tren 1 CDU bang cach s dung bo ghep Hybrid phu theo hng phat gia dTRU va CDU-G.

b. CDU-F:

Cac ac iem chnh cua CDU-F:

CDU-F c thiet ke e co the cho phep nhieu TRX tren 1 anten.

Mot CDU-F co cung kch thc vat ly so vi CDU-G.

Ho tr nhay tan bang goc.

Khoang cach tan so giam xuong 400 KHz.

Ho tr cac cau hnh 1, 2 hoac 3 sector cho mot tu RBS 2206.

Ho tr 2 dai tan 900 va 1800 MHz.2.3.2.8. Double Transceiver Unit dTRU:

dTRU la mot bo phan co the thay the c, gom 2 may thu phat. RBS 2206 co the ho tr 6 dTRU trong cung mot cabinet. Moi mot dTRU bao gom hai bo thu phat khac nhau. V vay RBS 2206 co the len en 12 bo thu phat trong cung mot cabinet.

dTRU co nhieu version khac nhau. Tuy nhien tat ca eu co the ho tr c trong mang GPRS. dTRU ho tr nhieu chuan ma hoa khac nhau, thong thng A5/1 hoac A5/2. Nhng loai ma hoa nay c ieu khien thong qua phan mem.

Trong dTRU bo ghep Hybrid c s dung trong CDU-G e tang so lng bo thu pha TRX tren moi anten. Tuy nhien ta cung co the cau hnh e bo qua chc nang nay bang cach dung day cap ket noi ti CDU.

Hnh 2. 48: Khoi dTRU trong RBS 2206.2.3.3. Cac ket noi RF:

Trong phan nay chung ta se nghien cu cac ket noi gia cac CDU, CXU, dTRU va ASU trong tu RBS 2206. Cac ng cap trong tu c nhom lai thanh tng bo, cung cap cap cho tat ca cac chc nang sau: Cap EPC EPC gia PSU, FCU, DXU va BFU.

Nguon: tat ca cac ng cap lien quan en nguon vao.

CDU: tat ca cac ng cap lien quan en dTRU, CXU va CDU.

2.3.3.1. Ket noi CDU-F:

a. S o ket noi:

Hnh 2. 49: S o ket noi CDU-F vi 12 TRX (6 dTRU) tren 1 sector trong RBS 2206.

b. Ket noi gia CDU-F vi dTRU:

Hnh 2. 50: Ket noi CDU-F vi dTRU trong RBS 2206.c. Ket noi gia cac CDU-F:

Hnh 2. 51: Ket noi gia cac CDU-F trong RBS 2206.

2.3.3.2. Ket noi CDU-G:

a. S o ket noi:

Hnh 2. 52: S o ket noi CDU-G vi 4 TRX (2 dTRU) trong moi sector trong RBS 2206..

b. Ket noi gia CDU-G va dTRU:

b.1. Co bo ghep Hybrid:

Hnh 2. 53: Ket noi gia CDU-G va dTRU (co bo ghep hybrid) trong RBS 2206.b.2. Khong co bo ghep Hybrid:

Hnh 2. 54: Ket noi gia CDU-G va dTRU (khong co bo ghep Hybrid) trong RBS 2206.b.3. Cau hnh 1+1+2:

Hnh 2. 55: Ket noi gia CDU-G va dTRU theo cau hnh 1+1+2 trong RBS 2206.2.3.3.3. Ket noi cap ASU:

Hnh 2. 56: Ket noi cap ASU trong RBS 2206.ASU yeu cau cung cap nguon va ket noi en cac anten, cac CDU va CXU. Tat ca cac cong c at tren mat trc cua ASU. Co 18 cong, chia thanh 3 nhom, moi nhom gom 6 cong.

Hnh 2. 57: Cac cong ket noi tren ASU trong RBS 2206.

Bang 10: Chc nang cac cong tren ASU trong RBS 2206.2.3.4. Cac cau hnh cho thiet b RBS 2206:

2.3.4.1. Ket noi vi Anten:

Trong phan nay, chung ta se e cap en viec noi cap t anten ti ASU. Cac cap RF gia CDU va cac TRU co lien quan a c chuan hoa va khong thay oi.

Hnh 2. 58:Ket noi cap gia ASU va au noi chia se anten trong RBS 2206.2.3.4.2. Cau hnh vi CDU-F:

a. Ket noi vi anten:

Ngo ket noi vi anten nam pha tren cua cung CDU.

Hnh 2. 59: Ngo ket noi vi Anten cua CDU-F trong RBS 2206.b. Cac cau hnh:

b.1. Cau hnh 3x2 va 3x4:

Hnh 2. 60: Cau hnh 3x2 va 3x4 CDU-F co va khong co TMA trong RBS 2206.

Bang 11: Yeu cau cua cau hnh 3x2 va 3x4 CDU-F trong RBS 2206.T hnh ve, ta thay rang cac cau hnh sau ay co the thc hien c: 1x2, 2x2, 1x4 va 2x4.

b.2. Cau hnh 1x8:

Hnh 2. 61: Cau hnh 1x8 CDU-F co va khong co TMA trong RBS 2206.

Bang 12: Yeu cau vi cau hnh 1x8 CDU-F trong RBS 2206.b.3. Cau hnh 1x12:


Bang 13: Yeu cau cho cau hnh 1x12 CDU-F trong RBS 2206.b.4. Cau hnh 2x6:


Bang 14: Yeu cau vi cau hnh 2x6 CDU-F trong RBS 2206.b.5. Cau hnh 1x4 + 1x8:

Hnh 2. 64: Cau hnh 1x4 + 1x8 CDU-F co va khong co TMA trong RBS 2206.

Bang 15: Yeu cau vi cau hnh 1x4 + 1x8 CDU-F trong RBS 2206.b.6. Cau hnh: 1x8 + 1x4:

Hnh 2. 65: Cau hnh 1x8 + 1x4 CDU-F co va khong co TMA trong RBS 2206.

Bang 16: Yeu cau cho cau hnh 1x8 + 1x4 CDU-F trong RBS 2206.2.3.4.3. Cau hnh vi CDU-G:

a. Ket noi vi Anten:

Ngo ket noi vi anten nam pha tren cua cung CDU.

Hnh 2. 66:Ngo ket noi vi anten cua CDU-G trong RBS 2206.b. Cac cau hnh:

b.1. Cau hnh 3x2 va 3x4:

Hnh 2. 67: Cau hnh 3x2 va 3x4 CDU-G co va khong co TMA trong RBS 2206.

Bang 17: Yeu cau cho cau hnh 3x2 va 3x4 CDU-G trong RBS 2206.T cau hnh tren, ta co the thc hien c mot so cau hnh khac nh: 1x2, 2x2, 1x4 va 2x4.

b.2. Cau hnh 1x8:

Hnh 2. 68: Cau hnh 1x8 CDU-G co va khong co TMA trong RBS 2206.

Bang 18: Yeu cau cho cau hnh 1x8 CDU-G trong RBS 2206.b.3. Cau hnh 1x12:


Bang 19: Yeu cau cho cau hnh 1x12 CDU-G trong RBS 2206.b.4. Cau hnh 2x6:


Bang 20: Yeu cau cho cau hnh 2x6 CDU-G trong RBS 2206.2.3.5. Thay oi cau hnh:

Trong phan nay chung ta se mo ta nhng cau hnh khac nhau vi ong bo nhom thu phat va cach e ket noi cap ESB (External Synchronization Bus).

Neu cau hnh ang ton tai khong khong c m rong ay u th chung ta co the thay oi cau hnh bang cach them vao cac thanh phan sau ay:

Them cabinet mi.

Them dTRU.

Them CDU.

Cau hnh cung co the thay oi bang cach thao g cac phan t tren.

Trong phan nay chung ta mo ta nhng cau hnh khac nhau cua TG, va cach ket noi cap ESB gia hai cabinet RBS 2206. ong bo TG la cong nghe s dung e m rong them mot cabinet RBS 2206 trong cung mot cell. Viec ong bo c thc hien bang cach thay oi thong so ve thi gian thong qua cap ESB.2.3.5.1. Cau hnh vi ong bo TG:

Chung ta se a ra mot so v du ve cac cau hnh vi ong bo TG. Phan ghach cheo trong cac hnh ve the hien CDU va TRU nao ket hp vi nhau:

Hnh 2. 71: Ket hp 2 RBS 2206 vi CDU-F n bang.

Hnh 2. 72:Ket hp 2 RBS 2206 vi CDU-G n bang.

Hnh 2. 73: M rong RBS 2202 vi 1 RBS 2206.a. RBS 2202 CDU-C+ va RBS 2206 CDU-G

b. RBS 2202 CDU-D va RBS 2206 CDU-F.

2.3.5.2. Ket noi cap ESB:

Cap ESB dung e ket noi gia cac cabinet va co the cau hnh m rong nhieu hn mot cabinet.

Hnh 2. 74: Ket noi cap ESB.

2.4. Canh bao va x ly canh bao trong ho RBS 2000:Muc ch cua phan nay la mo ta cac loi khac nhau, nguyen nhan va cach x ly.2.4.1. Thong bao loi RBS:

Phan mem he thong tren RBS giam sat moi trng hoat ong va thong bao ve cac loi en he thong con O&M (OMS). Sau khi xac nh loi, OMS se ghi lai tren Managed Object (MO) e chu trach nhiem cho khu vc b loi. MO se gi mot thong bao loi cho BSC e ch ra tam quan trong va nguon goc cua loi: Class I1A: Loi ben trong MO, anh hng ti chc nang MO.

Class I1B: Loi ben ngoai MO, anh hng ti chc nang MO.

Class I2A: Loi ben trong MO, khong anh hng ti chc nang MO.

Class EC1: Loi ben ngoai RBS, anh hng ti chc nang MO.

Class EC2: Loi ben ngoai RBS, khong anh hng ti chc nang MO.

Thong bao loi en t MO CF va TRXC cung cha v tr RU e xac nh n v phan cng b loi.

Da vao thong bao nhan c, BSC se thc hien cac viec sau:

Class I1A: MO se ngng van hanh va thc hien viec kiem tra: Neu ket qua kiem tra xac nh MO khong loi, MO se van hanh tr lai va loi c xem nh khong lien tuc. Bo em loi se kiem tra cac loi nay va MO se ngng van hanh neu so lng loi khong lien tuc qua ln.

Neu ket qua kiem tra xac nh MO b loi, MO se ngng van hanh cho ti khi het loi hoac co s can thiep cua nha khai thac. Canh bao A2 se c a ra trong BSC/OSS.

Class I1B va EC1: MO se ngng van hanh cho ti khi het loi hoac co s can thiep cua nha khai thac. Canh bao A2 se c a ra trong BSC/OSS.

Class I2A va EC2: canh bao A3 se c a ra trong BSC/OSS. MO van van hanh. Chu y rang mot loi loai I2A ghi tren CF hay TRXC co the ch ra rang loi I1A/I1B a xuat hien tai cap thap hn MO.2.4.2. Tm thong tin loi:Thong tin loi ay u se c phan tch e thc hien viec sa cha. Ta co the nhan c thong tin nay t: BSC vi dong lenh MML:

Moi canh bao tren MO: RXASP:MO=RXO;

Moi loi (Class 1) tren TG: RXMFP:MO=RXOTG-x,FAULTY,SUBORD;

Moi loi tren MO: MO:RXMFP:MO=RXO;

Ghi loi cho MO: RXELP:MO=RXO;

T OMT tai cho:

Moi loi tren TG: System view/ RBS 2000/ Monitor/ Fault status

RU b loi tren TG: System view/ RBS 2000/ Display faulty RUs

Ghi loi tren DXU/TRU/ECU: Hardware view/ SelectU/ Save log2.4.3. Trang thai cua cac LED:Cac en LED cho ta biet tong quat ve tnh hnh loi nhng luon luon phai i kem vi OMT e sa cha.

2.4.3.1. LED bao loi (o): On: n v co the b loi.

Co gang tm ra neu loi nay ch tam thi bang cach tat m nguon hay reset DXU.

Co gang tm ra neu loi phu thuoc vao moi trng cua n v bang cach a no sang v tr khac.

Neu khong c, ta phai thay the khoi nay, luon luon kiem tra thong tin loi bang OMT va ghi lai vao the gan mau xanh e gi en trung tam sa cha.

Nhap nhay tren DXU: Co 2 kha nang:

IDB ang thieu hoac b ngat ( Cai at lai IDB va reset DXU. ng dung phan mem b thieu hoac b ngat ( Reset DXU, neu khong c th thc hien mot thay oi chc nang t BSC. Nhap nhay tren TRU/ECU: Co 2 kha nang xay ra:

Mat lien lac vi DXU. Cac loi CF I1A hay I2A : 41/42 co the xuat hien tren bang giam sat trang thai loi cua OMT ( Xem lai cac ch th lien quan en ma loi.

ng dung phan mem co the b thieu hoac b ngat; phan mem mi phai c download t ong t DXU. Neu khong, reset khoi hoac DXU(LED mau xanh la cay se bat au nhap nhay tren khoi.

Chu y rang LED xanh la cay tren DXU, TRU va ECU se nhap nhay trong khoang thi gian dai (20 ( 60 phut, tuy thuoc vao tai lu lng va bang thong LAPD), sau o viec tai phan mem se c tiep tuc, khong bam nut reset.

Neu LED xanh la cay ch nhap nhay tren DXU th TF se thc hien ong bo (Khoang 5 phut).

2.4.3.2. Local Mode LED (Vang):

Off = Remote mode: khoi phan cng co mot lien ket bao hieu vi BSC. On = Local mode: khoi phan cng khong co lien ket bao hieu va khong b ieu khien bi BSC.

Nhap nhay: ang chuan b chuyen sang Remote mode: khoi phan cng ang ch BSC thiet lap mot lien ket bao hieu.

Chu y rang khi mot khoi (DXU/TRU) la remote mode va nut bam local/remote c bam, mot thong bao loi EC1:4 c gi ti BSC e thong bao rang mot so viec bao dng cuc bo se xay ra tren khoi. Moi MO lu lng se b vo hieu hoa va lien ket bao hieu se b ngat. Khi nut local/remote b nhan mot lan na, lien ket bao hieu c tai thiet lap va het loi EC1:4.2.4.3.3. Cac van e vi Local mode led:

LED luon luon sang, khoi phan cng khong chuyen qua che o remote ngay ca sau khi a nhan nut local/remote. Kiem tra bo giam sat loi tren OMT, co the se co mot so ch th rang khoi phan cng b loi trong cau hnh local cua no. Sau 10 phut, khoi phan cng chuyen sang che o remote e thong bao vi BSC rang cau hnh local cua no a b loi. LED nhap nhay trong thi gian hoat ong co ngha la lien ket bao hieu khong c thiet lap vi BSC. Kiem tra bo giam sat loi OMT: neu khong co loi nao c ch th th van e co the en t ben ngoai RBS. Kiem tra chac chan rang: Cac cap PCM tren DXU va tu a c ket noi.

Cac thong so truyen dan a c lap trong IDB: gia tr DXU TEI, PCM (CRC-4, cascade/stand-alone, spare bits)

Gia tr TEI c thiet lap tren BSC (RXMOP tren CF va TRXC).

Gia tr DCP va ng A-bis a c xac nh tren BSC (RXAPP tren TG, RXMOP tren TRXC).

Cac thiet b TRH va RBLT cua BSC ang hoat ong.

Cac thiet b truyen dan ang hoat ong.

2.4.4. Hng dan khac phuc loi:Cach n gian nhat e khac phuc loi thng la thay the phan cng b loi. ieu nay thng ton sc lc va thi gian. Hn na, hau het cac thiet b phan cng thng rat at tien. Sau ay la mot so cong viec ma ta can phai th trc khi thay the phan cng mi. Trong mot so trng hp, no se giup ta tranh c viec thay the va sa cha khong can thiet.2.4.4.1. Khac phuc tai BSC: Block/deblock phan thong bao loi (CF hay TRXC). ieu nay se gay ra viec khi ong lai nhanh tren DXU/TRU.

Co gang huy bo va a CF hay TRXC tr lai cong viec cua no. ieu nay gay ra reset nhanh tren DXU/TRU, xoa lien ket LAPD va lien ket TRAU, chon la TRH va TRA mi, tai thiet lap lien ket va khi ong lai DXU/TRU. Co gang download phan mem trong ieu kien khac thng. Sau khi download hoan tat, tren DXU co the xay ra reset bnh thng giong nh khi nhan nut reset.

2.4.4.2. Khac phuc tai cho: Ket noi OMT va co gang khoanh vung loi bang cach oc thong tin trong bo giam sat va RU logs. Neu OMT mi nhat khong cung cap ay u cac chc nang can thiet th hay ket hp OMT R15/5 vi OMT R13/2 va phai am bao s tng thch OMT-RBS.

Kiem tra moi ket noi RF, au cuoi Local Bus, CDU-bus, cap PCM, cap nguon

Khi ong lai hoac tat/m nguon tai khoi b loi.

Cai at lai IDB va reset DXU.

Tat nguon toan bo tu, ch mot thi gian sau o m lai.

Thay the cac khoi ben trong tu va quan sat xem loi a het hay van con v tr o. Neu het loi th khoi phan cng a b loi con neu van co loi v tr o th a co van e vi cac ket noi (bang au noi, CDU-bus, feeder). Neu khoi phan cng c gi en trung tam sa cha th phai am bao rang a ien ay u thong tin ve ma loi vao the xanh.

2.4.5. Ket luan:S o RU tren phan canh bao loi CF/TRXC va chc nang hien th loi tren OMT la nhng ch th ro rang e xac nh khoi phan cng b loi. Tuy nhien, phai nh rang mot so loi xay ra la do cac yeu to khac nh phan mem, IDB, cac ket noi, moi trng v.v ieu o giai thch tai sao loi co the de dang c khac phuc bang mot so cong viec n gian ma khong phai thay the phan cng.2.5. Dung OMT e khai bao tram BTS:Sau ay chung ta se tm hieu viec dung phan mem OMT Version R17_5 e khai bao cac cau hnh ket noi gia cac RBS: Stand-alone, Cascade va Master-Extension. Trong trng hp au noi Cascade, ta co cau hnh vat ly nh sau:

Hnh: au noi Cascade

Hnh: Giao dien chnh cua OMT Ver R17_5.2.5.1. Stand-alone va Cascade:Trc het, ta phai khai bao c s d lieu IDB cho OMT. oi vi kieu stand-alone, ta ch can khai bao cho 1 cabinet. Chon khoi IDB trong System View, sau o vao Operation/ Create IDB. Hop thoai tao IDB xuat hien.

Hnh: Hop thoai tao IDB.

Hnh: Hop thoai chon cau hnh Sector.Co 3 phan chnh ma ta can phai ien ay u thong so la giao dien truyen dan (Transmission Interface: E1 hoac T1), thong so RBS (Cabinet setup) va thong so sector cua Anten. Sau o hop thoai la chon cau hnh anten se xuat hien.

Trong trng hp stand-alone th khong can phai nhap a ch RBS (CF TEI). Trong trng hp au noi Cascade, TEI phai c cap theo th t. Ta thc hien nh sau:

La chon khoi DXU. Vao Operation/ Define TEI, hop thoai Define TEI xuat hien, ta nhap gia tr TEI t 12 ( 63.

e khai bao Stand-Alone hay Cascade ta thc hien cac bc sau: Chon Connection/ Connect: Hop thoai Connect xuat hien:

Chon cau hnh Stand-Alone hay Cascade; neu la cascade th phai nhap gia tr TEI cho RBS. Nhap khe thi gian dung e lien lac vi RBS. Xac nhan bang nhan OK.2.5.2. Master-Extension:

Hnh: au noi Master-Extension.e m rong cau hnh bang cach tang them 1 tu thiet b (cabinet) : ta lap them 1 tu Extension va ket noi vi tu Master vi nguyen tac ket noi nh tren. Tiep theo, ta tien hanh khai bao bang OMT nh sau:Neu tu Master la mot RBS 2000 th thong tin can thiet la Transmitter Chain Delay. Dung OMT tai tu Master co the lay ra c thong tin nay bang cach thi hanh lenh Display Information tren bieu tng RBS. Neu tu Master la RBS 200/205 th thong tin oi hoi la loai Combiner, thng la TMA va Feeder Delay.Cai at IDB cung nh trong cau hnh Stand-alone va Cascade nhng phai khai bao 2 tu. Neu ta dung ong bo nhom thu phat th phai thiet lap gia tr TF Compensation (DXU-01 va DXU-03 khong ho tr ong bo nhom thu phat). e ien ung gia tr TF Compensation, ta can phai thc hien cac bc nh sau:

Xac nh Delay cho moi feeder va ESB. Chon bieu tng RBS tai System View.

Chon Operation/ Define TF Compensation, hop thoai xuat hien:

Hnh: Hop thoai chon gia tr TF Compensation.

Nhap vao thong so tu Master: Neu tu Master la RBS 200/205 th nhap vao thong so loai Combiner, ngc lai, nhap thong so Transmitter Chain Delay.

Nhan Apply: gia tr TF Compensation c e ngh s dung se hien ra.

Thay oi gia tr TF Compensation hien tai: thng dung gia tr c e ngh.

Xac nhan bang OK.(a)

(b)

(c)

(c)

(d)

(e)

(a)

(b)

(a)

(b)

(c)

(d)

rbs 2202 va rbs 2206

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