TNG CNG TY VIN THNG QUN I CNG TY VIN THNG VIETTEL
BO CO TH VIC
ti:
IU KHIN CNG SUT
Nhn vin thc hin Phng
: NGUYN TH HUYN THO : Thit k - Ti u 1
Trung tm iu hnh K thut Viettel Telecom
H Ni, thng 9 nm 2008
NHN XT CA TRNG PHNG THIT K TI U..
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LI NI UHin nay cng ngh 2G vn chim th ch o trn th trng thng tin di ng ca Vit Nam. Cuc ua gia cc mng di ng nc ta ang din ra ngy cng quyt lit. Cuc ua ny din ra khng ch phm vi ph sng, cc loi hnh dch v... m cht lng ca mng di ng thc s tr thnh tiu ch cnh tranh ch yu gia cc mng. Vic nghin cu hiu v ci thin cht lng phc v ca h thng thng tin di ng 2G vn l vn m cc nh cung cp dch v di ng 2G ang quan tm hng ngy. iu khin cng sut trong h thng GSM l vn rt quan trng. V vy, vn iu khin cng sut gi c bit c quan tm hn na. Trn c s yu cu ca thc t, em tp trung tm hiu mt s ni dung quan trng trong h thng thng tin di ng GSM l thut ton iu khin cng sut. Cc gii php c gii thiu trong bo co bao gm kin thc tng quan, l thuyt c s, thut ton, b tham s iu khin. Qua y em xin trn trng cm n cc anh ch phng thit k ti u 1 v cc anh ch ca Trung tm iu hnh k thut Cng ty Viettel Telecom nhit tnh gip em hon thnh bo co th vic ny.
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DANH SCH HNH V:
DANH SCH BNG:
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MC LCNHN XT CA TRNG PHNG THIT K TI U...............................................i LI NI U......................................................................................................................ii DANH SCH HNH V:....................................................................................................iii DANH SCH BNG:.........................................................................................................iii VIT TT..........................................................................................................................vii PHN I:................................................................................................................................8 GII THIU CHUNG V TNG CNG TY.....................................................................8 VIN THNG QUN I VIETTEL................................................................................8 1. LCH S HNH THNH V PHT TRIN..................................................................8 2. CC LNH VC KINH DOANH CA TNG CNG TY............................................9 2.1. Ngnh ngh kinh doanh.............................................................................................9 2.2. Hot ng kinh doanh hin ti...................................................................................9 3. C CU T CHC CA TNG CNG TY VIETTEL............................................10 3.1. M hnh t chc:......................................................................................................11 3.1.1 Ban Gim c:................................................................................................11 3.1.2. Khi c quan Tng Cng ty:.........................................................................12 3.1.3. Khi n v s nghip:..................................................................................12 3.1.4. Khi n v hch ton ph thuc:..................................................................12 3.1.5. Khi n v hch ton c lp:......................................................................13 3.2. Nhn s Tng Cng ty:............................................................................................13 3.3. Tnh hnh sn xut kinh doanh ca Tng Cng ty:..................................................13 3.4. Quan im nh hng pht trin ca Tng cng ty...............................................15 3.4.1. Kt hp kinh t vi quc phng....................................................................15 3.4.2. nh hng kinh doanh.................................................................................15 3.4.3. Ly yu t con ngi lm ch o...............................................................15 4. GII THIU V CNG TY VIN THNG VIETTEL...............................................15 4.1. Qu trnh hnh thnh v pht trin ..........................................................................15 4.2. Chc nng ca Cng ty Vin thng Viettel............................................................17 4.3. Nhim v ca Cng ty Vin thng Viettel ............................................................18 4.3.1 Nhim v khai thc v kinh doanh:................................................................18 4.3.2 Nhim v qun l ...........................................................................................18
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4.3.3 Nhim v chnh ..............................................................................................19 4.4. M hnh t chc cng ty Vin thng Viettel Telecom ............................................19 5. M HNH T CHC, CHC NNG NHIM V,.....................................................20 TRUNG TM HKT - CNG TY VIN THNG VIETTEL NM 2008......................20 5.1. Chc nng, nhim v, quyn hn, mi quan h ca trung tm iu hnh k thut 20 5.1.1. Chc nng ca Trung tm HKT..................................................................20 5.1.2. Nhim v ca Trung tm HKT:..................................................................20 5.1.3. Quyn hn v trch nhim ca Trung tm HKT:........................................21 5.1.4. Mi quan h ca Trung tm HKT:..............................................................22 5.2. Nhim v, m hnh phng thit k ti u I (KV1) thuc trung tm HKT ...........26 5.2.1. Nhim v.......................................................................................................26 5.2.1.1. Ban Thit k:...............................................................................................26 5.2.1.2. Ban Ti u:................................................................................................26 5.2.2. M hnh t chc.............................................................................................27 PHN 2:..............................................................................................................................28 CHUYN BO CO TH VIC...............................................................................28 IU KHIN CNG SUT..............................................................................................28 2.1 Gii thiu..................................................................................................................28 2.2 M t k thut...........................................................................................................28 2.2.1 M t chung:...................................................................................................28 2.2.2 i tng ca iu khin cng sut...............................................................29 2.3 Thut ton iu khin cng sut ca BTS:...............................................................30 2.3.1 Chun b d liu u vo:...............................................................................30 2.3.2 Lc kt qu o................................................................................................32 2.3.3 Tnh ton iu chnh mc cng sut...............................................................33 2.4 Thut ton iu khin cng sut ca MS:.................................................................34 2.4.1 Chun b d liu u vo:...............................................................................34 2.4.2 Lc kt qu o................................................................................................34 2.4.3 Tnh ton iu chnh mc cng sut...............................................................35 2.5 Th tc iu chnh....................................................................................................36 2.6 iu khin cng sut AMR FR.................................................................................37 2.6.1 Tng quan.......................................................................................................37
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2.6.2 Thut ton iu khin cng sut AMR FR.....................................................37 2.7 iu chnh cc tham s.............................................................................................38 CHNG 3: IU KHIN CNG SUT TRONG CNG TC TI U MNG V TUYN...............................................................................................................................33 3.1 Mc tiu iu chnh cng sut:.................................................................................33 3.3 V d iu chnh b lc.............................................................................................34 3.4 Th nghim thay i thng s iu khin cng sut ti HNI: .................................36 3.4.1 Mc ch th nghim:.....................................................................................36 3.4.2 CC KPI........................................................................................................38 3.4.2.1 Xu th ca CDR theo ngy..........................................................................38 3.4.2.3 SQI...............................................................................................................38 ........................................................................................................................................40
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VIT TT
Vit tt AMR BCCH C/I DTX SDCCH CNA LRP
Ting anh Adaptive Multi Rate Broadcast Control Channel Carrier to Interference ratio Discontinuous Transmission Standalone Dedicated
Ting vit Thch ng a tc Knh qung b iu khin T s sng mang trn nhiu Truyn pht gin on Control Knh iu khin dnh ring ng 1 mnh Qun l mng di ng im tham chiu Locating
Channel Cellular Network Administration Locating Reference point
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PHN I: GII THIU CHUNG V TNG CNG TY VIN THNG QUN I VIETTEL1. LCH S HNH THNH V PHT TRINTng cng ty Vin thng qun i (Viettel) trc y l Tng cng ty Thit b in t Thng tin, mt doanh nghip nh nc c thnh lp ngy 1 thng 6 nm 1989 theo ngh nh s 58/ HBT. Ngy 20 thng 6 nm 1989 i tng L c Anh- B trng B Quc phng k quyt nh s 189/Q-QP quy nh v nhim v, quyn hn v c cu t chc ca Cng ty. Theo , Tng Cng ty Thit b in t Thng tin trc thuc Binh chng thng tin lin lc, l n v sn xut kinh doanh tng hp, hch ton c lp v c t cch php nhn. Ngy 27 thng 7 nm 1993: Theo quyt nh s 336/Q-BQP v vic thnh lp li doanh nghip nh nc, Cng ty in t Thit b Thng tin trc thuc B t lnh thng tin lin lc vi tn giao dch quc t l SIGELCO. Ngy 14 thng 7 nm 1995: Cng ty in t Thit b Thng tin c i tn thnh Cng ty in t Vin thng Qun i, tn giao dch l Viettel, tr thnh nh khai thc bu chnh vin thng th 2 ti Vit Nam. Ngy 19 thng 4 nm 1996: Cng ty in t Vin thng Qun i c thnh lp theo quyt nh 522/ Q-BQP trn c s st nhp 3 n v l Cng ty in t Vin thng Qun i, Cng ty in t Thit b Thng tin 1 v Cng ty in t Thit b Thng tin 2. Ngy 28 thng 10 nm 2003: Cng ty in t Vin thng Qun i c i tn thnh Cng ty Vin thng Qun i, tn giao dch l Viettel Corporation, tn vit tt l Viettel. Nm 2004: Chnh thc cung cp dch v in thoi di ng trn ton quc vi mng Viettel Mobile 098. Ngy 6 thng 4 nm 2005: Theo quyt nh s 45/2005/Q- BQP, Cng ty Vin thng Qun i c chuyn thnh Tng Cng ty Vin thng Qun i trc thuc B Quc Phng, tn giao dch bng ting Anh l VIETTEL CORPORATION, tn vit tt l Viettel. Tr s chnh: S 1, Giang Vn Minh, Ba nh, H Ni in thoi: (84) 2556789 Fax: (84) 2996789 -8-
Bo co th vic Website: http// www.viettel.com.vn
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2. CC LNH VC KINH DOANH CA TNG CNG TY 2.1. Ngnh ngh kinh doanh- Kinh doanh cc dch v bu chnh vin thng trong nc v quc t. - Pht trin cc sn phm phn mm trong lnh vc in t, vin thng, cng ngh thng tin, Internet. - Sn xut, lp rp, sa cha v kinh doanh thit b in, in t vin thng, cng ngh thng tin v thit b thu pht v tuyn in. - Hot ng trong lnh vc xy dng bu chnh, vin thng, cng ngh thng tin, truyn ti in. - Kho st, lp d n cng trnh bu chnh, vin thng, cng ngh thng tin. - o to ngn hn, di hn cn b cng nhn vin trong lnh vc bu chnh vin thng. - u t xy dng c s h tng, a c - Xut nhp khu cng trnh, thit b ton b v in t v thng tin, cc sn phm in t thng tin. 2.2. Hot ng kinh doanh hin ti - Thit lp mng v cung cp dch v in thoi chuyn mch cng cng ni ht (PSTN). - Cung cp dch v vin thng ng di trong nc v quc t s dng cng ngh VoIP. - Thit lp mng v cung cp dch v thu knh. - Cung cp dch v Internet (OSP) v kt ni Internet (IXP). - Thit lp mng v cung cp dch v thng tin di ng. - Thit lp mng v cung cp dch v bu chnh trong nc v quc t. - Dch v kho st thit k, lp d n cc cng trnh vin thng, pht thanh truyn hnh - Dch v gi tr gia tng - Dch v u t ti chnh - Dch v xy lp cng trnh - Dch v xut nhp khu thit b ng b v in t cho cc cng trnh thng tin v cc sn phm in t vin thng -9-
Bo co th vic - Dch v cng ngh Wimax v 3G
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3. C CU T CHC VIETTEL- 10 -
CA TNG CNG TY
3.1. M hnh t chc:
M HNH T CHC TNG CNG TY VIN THNG QUN I
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KHI N V HCH TON C LP
P TNG GIM C
CNG TY BU CHNH VIETTEL CNG TY TM XUT NHP KHU VIETTEL
P TNG TNG GIM C P GIM C
TNG GIM C
CNG TY CNG TRNH VIETTEL CNG TY T VN THIT K VIETTEL CNG TY CP U T QUC T VIETTEL
KHI N V HCH TON PH THUC
TRUNG TM IDC CHI NHNH VIN THNG TNH/TP (64 CN TNH/TP) CNG TY CNG NGH VIETTEL
TRUNG TM U T XY DNG P TNG GIM C TRUNG TM VIETTEL MEDIA CNG TY THU CC V DCH V VIETTEL CNG TY TRUYN DN VIETTEL
3.1.1 Ban Gim c:I N S HIP - 11 -
CNG TY VIN THNG VIETTEL
TRUNG TM O TO VIETTEL P TNG GIM
KHI C QUAN TNG CNG TY
Bo co th vic Tng Gim c:
CU LC B BNG TH CNG VIETTEL Huyn Tho Nguyn Th- VN PHNG TCT - P. CHNH TR - P. T CHC L - P. TI CHNH - P. K HOCH - P. KINH DOANH - P. K THUT - P. U T PT - P. XY DNG CSHT - BAN CSBCVT - BAN THANH TRA - BAN NG DNG CNTT - BAN QLDA BOT - I DIN VNG
Thiu tng Hong Anh Xun Ph Tng Gim c: i t Dng Vn Tnh i t Nguyn Mnh Hng i t Tng Vit Trung i t L ng Dng i T Hong Cng Vnh
3.1.2. Khi c quan Tng Cng ty: Vn phng Phng chnh tr Phng k thut Phng kinh doanh Phng ti chnh Phng k hoch Phng u t v pht trin Phng xy dng v pht trin h tng Phng t chc lao ng Ban chnh sch bu chnh vin thng Ban thanh tra Ban Qun l d n BOT Ban ng dng CNTT Tm vn phng i din t ti cc thnh ph Thi Nguyn, Ph Th, H Ni, Vinh,
Nng, Khnh Ho, TP. H Ch Minh v Cn Th. 3.1.3. Khi n v s nghip: CLB Th Cng Viettel Trung tm o to Viettel
3.1.4. Khi n v hch ton ph thuc: - Cng ty Viettel Telecom - Cng ty truyn dn Viettel - Cng ty thu cc v dch v Viettel - 12 -
Bo co th vic - Trung tm Viettel Media - Trung tm u t xy dng - Cng ty Cng ngh Viettel - Trung tm IDC
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- Chi nhnh vin thng tnh/TP (64 CNVTTnh/Thnh ph) 3.1.5. Khi n v hch ton c lp: - Cng ty t vn thit k Viettel - Cng ty cng trnh Viettel - Cng ty Xut nhp khu Viettel - Cng ty Bu chnh Viettel - Cng ty C phn u t Quc t Viettel. 3.2. Nhn s Tng Cng ty: Viettel t ho vi i ng hn 11.600 cn b nhn vin bao gm S quan, Qun nhn chuyn nghip, Cng nhn vin Quc phng v lao ng k hp ng, trong hn 40% c trnh i hc v trn i hc, cao ng 17%, trung cp 26%, khc: 17%. nng cao nng lc lm vic, to iu kin cho ngi lao ng gn b lu di vi Tng cng ty, Viettel lun quan tm n chnh sch o to v trng dng nhn ti, cao vai tr ca tng c nhn trong s nghip pht trin ca Tng Cng ty. 3.3. Tnh hnh sn xut kinh doanh ca Tng Cng ty: T nm 1989 n nm 1999 Giai on ny, hot ng ca Tng Cng ty ch yu phc v cho nhim v quc phng: kho st, thit k, xy lp ng trc cp quang qun s Bc- Nam. ng thi, TCT cng tin hnh xy lp cc i pht thanh truyn hnh, lp t tng i k thut s, xy dng cc trm thng tin, thit b vi ba, thp anten, lp dng cc ct cao. T nm 1989 n 1995 l thi k s khai, hnh thnh ca TCT vi s rn luyn v trng thnh qua cc cng trnh xy lp thit b, nh trm vin thng v cc ct anten cho cc tuyn vi ba. Hai nm 1996-1997, ngoi vic thi cng xy lp cc cng trnh vin thng, bn thit b linh kin in, in t vin thng nhp khu, TCT cn thc hin thit k lp t h thng tng i t ng, thit b v tuyn in, thit b truyn s liu, thi cng mt s tuyn cp quang chun b cho vic thit lp mng v kinh doanh cc dch v bu chnh vin - 13 -
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thng thc s. Nm 1997, TCT chnh thc thit lp mng bu chnh cng cng vi dch v pht hnh bo ch, cung cp dch v trung k v tuyn. Nm 1998-1999, TCT trin khai th nghim v chnh thc kinh doanh dch v trung k v tuyn trn a bn thnh ph H Ni. Nghin cu v xy dng d n xin php th nghim dch v in thoi ng di s dng cng ngh VoIP. T nm 2000 n nay C th ni, nm 2000 l nm nh du bc ngot pht trin mi ca Viettel. Vo thng 2.2000, Viettel c cp php khai thc th nghim dch v VoIP. Thng 2/2000 i n thng nht v k tho thun kt ni cung cp dch v in thoi VoIP u tin Vit Nam vi VNPT. Ngy 15/10/2000, chnh thc t chc kinh doanh th nghim c thu cc dch v in thoi ng di VoIP trn tuyn H Ni- HCM, nh du s kin ln u tin c mt cng ty ngoi VNPT cung cp dch v vin thng ti Vit Nam, ph v th c quyn. T nm 2001 n 2003, Viettel trin khai h tng vin thng, lin tc cng c hon thin m hnh t chc vi mt lot cc n v thnh vin c thnh lp: Trung tm in thoi c nh; Trung tm cng ngh thng tin v dch v k thut; Trung tm mng truyn dn; Trung tm in thoi di ng. Vic thnh lp cc trung tm theo hng tch ring cc dch v c nh, di ng, Internetnhm mc ch tp trung pht trin nhanh giai on u. T nm 2004 n 2006 l giai on tng tc ca Viettel: nh v thng hiu trn th trng. iu ny th hin r nht khi vo u nm 2005 Cng ty Vin thng Qun i chuyn thnh Tng Cng ty Vin thng Qun i. Ngy 15/10/2004 Viettel chnh thc kinh doanh dch v in thoi di ng, ch hn mt thng sau khi hot ng, viettel c 100.000 khch hng, gn 1 nm sau n khch hng th 1 triu. Ngy 21/07/2006 n khch hng th 4 triu v n cui thng 12/2006 vt ln con s trn 7 triu khch hng. Theo s liu thng k nm 2006 ca GSMA th Viettel Mobile l mng di ng c tc pht trin nhanh th 13 trong tng s 20 mng di ng pht trin nhanh nht ca th gii. Thng 4/2007, con s khch hng ca Viettel Mobile ln ti 10.000.000 v Viettel cng xy xong 3.300 trm thu pht sng. Mi y, Viettel a cng ngh Wimax v 3G vo kinh doanh th nghim trn a bn H Ni v Tp.HCM. Ngy 07/01/2007, Viettel l mt trong 7 n v c Ban thi ua khen thng trao tng siu cp sn phm Vit Nam uy tn v cht lng ln th nht. - 14 -
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Ngy 27/04/2007, vi nhng ng gp cho nn kinh t v s pht trin ca t nc, Viettel vinh d c nhn Danh hiu Anh hng lao ng. 3.4. Quan im nh hng pht trin ca Tng cng ty 3.4.1. Kt hp kinh t vi quc phng y l nh hng quan trng cho s pht trin ca Tng Cng ty. Kt hp cht ch pht trin kinh t vi vic hon thnh xut sc nhim v an ninh chnh tr, pht huy th mnh, nng cao cht lng cc ngnh ngh truyn thng, m rng kinh doanh trong nc v quc t. 3.4.2. nh hng kinh doanh Quan tm ti mi nhu cu ca khch hng, lng nghe v p ng nhu cu ca khch hng mt cch tt nht, khng ngng hon thin cht lng dch v, tc phong, thi i vi khch hng. 3.4.3. Ly yu t con ngi lm ch o Tng Cng ty lun coi vn con ngi l vn ct li cho s pht trin ca mnh. Bi v tc pht trin nhanh, quy m ln th vn t ra l phi c mt i ng chuyn nghip, lnh ngh v c tm huyt vi ngh. Do , Tng Cng ty khng ngng quan tm n chnh sch tuyn dng, o to, tp hun cho cn b nhn vin, c bit l nhn vin tr cn thiu kinh nghim thc t. ng thi xy dng vn ho ngi nh chung Viettel.Thng 7 nm 2006, TCT chnh thc truyn thng 8 gi tr vn ho ct li Viettel bao gm: 1. Thc tin l tiu chun kim nghim chn l 2. Trng thnh qua nhng thch thc v tht bi 3. Thch ng nhanh l sc mnh cnh tranh 4. Sng to l sc sng 5. T duy h thng 6. Kt hp ng Ty 7. Truyn thng v cch lm ngi lnh 8. Viettel l ngi nh chung.
4. GII THIU V CNG TY VIN THNG VIETTEL 4.1. Qu trnh hnh thnh v pht trin- 15 -
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Ngy 31/05/2002, Cng ty in thoi di ng Viettel Mobile c thnh lp, trc thuc Ngy 15/10/2004, mng di ng 098 chnh thc i vo hot ng nh du mt bc
Tng cng ty Vin thng qun i (Viettel). ngot trong lch s pht trin ca Viettel Mobile v Viettel. Tnh n ngy 01/12/2004, mng in thoi di ng 098 ph sng c 62/64 Tnh/TP, thc hin kt ni hu ht cc mng di ng trong nc v Quc t. Hot ng kinh doanh c t chc trin khai ti 34 tnh/TP v pht trin c trn 100.000 thu bao. n thng 9/2005, mng in thoi di ng 098 thc hin ph sng v trin khai kinh doanh trn ton quc. S trm pht sng l trn 1000 trm. Thu bao di ng t 1 triu thu bao v c nh gi l nh cung cp dch v in thoi di ng pht trin mnh nht Vit Nam t trc n nay. Ngy 15/10/2005, Viettel Mobile k nim 1 nm thnh lp v cng b s thu bao t gn 1,5 triu - mt tc pht trin cha tng c trong lch s ngnh thng tin di ng ti Vit Nam. Ngy 07/01/2006, cha y 4 thng sau khi cho n khch hng th 2 triu, Viettel Thng 4/2007, Viettel Mobile chnh thc t con s 10 triu khch hng, iu cho Mobile tr thnh mt trong 3 nh cung cp dch v di ng ln nht Vit Nam. thy s trng thnh ln mnh v khng nh v th nh cung cp dch v vin thng di ng hng u ti Vit Nam ca Viettel. Ngy 18/06/2007, Tng cng ty Vin thng qun i Viettel cng b thnh lp Cng ty Vin thng Viettel Telecom, hon thnh vic st nhp hai cng ty ln l cng ty in thoi ng di Viettel (chuyn cung cp dch v Internet, in thoi c nh v ng di 178) v cng ty in thoi di ng Viettel thnh mt cng ty kinh doanh a dch v. Viettel Telecom gi y s cung cp tt c cc dch v vin thng ca Viettel ti Vit Nam, nh du bc trng thnh mi mang tnh t ph ca Viettel. Vi gi cc hp l v cht lng dch v n nh, Viettel Telecom thu ht c trn 32.000.000 triu thu bao (s thu bao ang hot ng 12.500.000) vi cc u s 098, 097, 0168, 0169, 0166. V ti thi im ny, Viettel tr thnh mng di ng c mng li v vng ph ln nht Vit Nam (10500 trm BTS) v cng l nh khai thc c s lng thu bao ln nht. C c kt qu nh ngy hm nay l do s phn u khng ngng ca Viettel Telecom: - 16 -
Bo co th vic Lun p dng nhng thnh tu khoa hc mi.
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Khng ngng i mi v nng cao cht lng dch v, nng cp c s h tng k thut. Thu ht, o to v trng dng ngun nhn lc ti nng v nhit huyt. Viettel Telecom lun cam kt n lc phn u khng ngng nng cao cht lng dch
v, phong cch phc v v uy tn ca tng cng ty p ng li s tin cy v trng i m khch hng dnh cho Viettel Telecom. Qua c th thy Viettel Telecom l nhn t thc y s bng n ca th trng thng tin di ng t nm 2005 tr li y: vic tng trng nhanh k lc mang tnh t ph, phng thc tnh cc 6s + 1 rt c li cho khch hng ca Viettel Telecom. cng chnh l tc nhn thc y v to ra mt cuc cch mng v phng thc tnh cc ca trn th trng di ng Vit Nam. Vi slogan ni ting Hy ni theo cch ca bn (Say it your way). Hnh nh ca TCT Vin thng Qun i Viettel tr nn ni ting, hu ch v thn thin vi ngi tiu dng Vit Nam.
Tt c cc chin lc, chnh sch v chng trnh khuyn mi, chm sc khch hng u v phng chm: "V khch hng trc, V mnh sau". y cng l trit l kinh doanh xuyn sut qu trnh hot ng ca Viettel Telecom v mc tiu hng ti ca Viettel l to ra mt "Ngi nh chung Viettel" m tnh nhn vn c cao v coi trng hn c. Khch hng s l ngi to ra dch v cho chnh h v cng ty s p ng, phc v vi trch nhim v hiu qu cao nht. 4.2. Chc nng ca Cng ty Vin thng Viettel - Cng tc tham mu: Gip ng y, Ban Gim c Tng cng ty v cng tc khai thc, xy dng nghin cu pht trin mng li k thut Vin thng, cc sn phm dch v Vin thng v xy dng nh hng chnh sch kinh doanh c hiu qu cc dch v Vin thng trong nc v Quc T. - 17 -
Bo co th vic
Nguyn Th Huyn Tho
- Qun l t chc thc hin: Tha lnh Tng Gim c t chc qun l, iu hnh cc hot ng khai thc, xy dng, nghin cu v pht trin mng li k thut Vin thng, cc dch v Vin thng v kinh doanh cc dch v Vin thng: vn hnh , khai thc thit b mng li, t chc sa cha, bo tr bo dng thit b nh k, ng cu thng tin, nghin cu xy dng, pht trin mng li kinh doanh trn ton quc. - Gim st: Thc hin vic kim tra gim st, n c cc hot ng sn xut kinh doanh theo k hoch c tng gim c cng ty ph duyt. 4.3. Nhim v ca Cng ty Vin thng Viettel 4.3.1 Nhim v khai thc v kinh doanh: - Qun l ton b mng li h tng k thut Vin thng v cc sn phm dch v Vin thng thng nht trn ton quc. - T chc vn hnh, khai thc s dng cc thit b, mng li hiu qu phc v cho sn xut kinh doanh. - Xy dng cc quy trnh khai thc, bo tr bo dng thit b mng li. - Lp k hoch nh k, k hoch d phng, t chc thc hin v kim tra gim st cng tc bo dng thit b theo quy nh. - T chc ng cu thng tin, khc phc s c trn ton mng. - Xy dng b my, t chc trin khai hot ng kinh doanh gm: cng tc xy dng chin lc pht trin kinh doanh, t chc qun l h thng bn hng, chm sc khch hng, gii quyt khiu ni v cc hot ng marketing khc. - Xy dng cc quy trnh nghip v, ti liu v chng trnh o to phc v cho cng tc. - Qun l tt cc hot ng k hoch, ti chnh, t chc lao ng, tin lng, o to, hnh chnh qun tr vt t, kho tng - Xy dng cc quy trnh nghip v, ti liu v chng trnh o to phc v cho cng tc khai thc kinh doanh. - Nghin cu xy dng pht trin mng li k thut Vin thng, pht trin cc dch v Vin thng theo cng ngh chung ton th gii v yu cu ca khch hng. 4.3.2 Nhim v qun l Qun l v iu hnh sn xut kinh doanh theo ng php lut, quy nh ca nh nc v Tng Cng ty. - 18 -
M HNH T CHC CNG TY VIN THNG VIETTEL
-
-
-
-
-
GIM C CNG TY
ty.
Bo co th vic
THUT PH GIM C
PG KINH PG TI CHNH
DOANH
PH GIM C
KHI KINH DOANHP. T chc Lao ng Phng Vin thng Quc t PhngTr uyn thng Phng Chnh tr Phng Chm sc KH
4.3.3 Nhim v chnh
KHI C QUAN QL
Phng Dch v di ng
Phng Dch v A&P
Phng VAS
thnh mt n v vng mnh ton din, c th:
Xy dng n np chnh quy v qun l k lut tt.
PHN PHT RIN H TNG iu hnh pht in H tng
T chc bin ch ng quy nh, duy tr nghim cc ch n np.
4.4. M hnh t chc cng ty Vin thng Viettel TelecomPhng Hnh chnh
lm tt cng tc dn vn, xy dng v gi vng an ton trn a bn ng qun.
Bo m tt cng tc k thut, cht lng dch v, khch hng tin tng.
Nguyn Th Huyn Tho
trin H tng hn xy dng ng
Vng mnh v chnh tr: Cn b, cng nhn vin c bn lnh chnh tr vng vng, sn
Chu trch nhim trc ng y, Ban gim c Tng cng ty xy dng cng ty tr
sng nhn v hon thnh tt cc nhim v c giao, t chc ng trong sch, cc t chc
qun chng thng xuyn t vng mnh, gii thiu cho ng nhiu qun chng u t,
m bo khng ngng nng cao i sng vt cht v tinh thn cho CBCNV ton cng
- 19 TRUNG TM H TR KD TNH TT GII P KHCH HNG
xut yu cu mng li, h TRUNG TM tng mng theo IU HNH K THUT nhu cu ca khch hng Ban Kim sot NB
TT PT K/HNG DOANH NGHIP
m bo cht lng mng li, pht trin h tng mng li theo yu cu kinh doanh
- Kinh doanh. - Chm sc khch hng. - K thut - D n -Tng hp
- Qun l knh phn phi - K hoch bn hng -H tr Ca hng, ST - H tr Tnh - Gii p - GQKN&CSKH - o to - Tng hp - TT.GKH ti HNI -TT. GKH ti HCM
Phng K hoch
- IT
Phng Ti chnhQun l, ch o, h tr CNVT
Tnh/TP v cc nghip c kd vin thng
64 TRUNG TM KTVT TNH
Phng u t
Phi hp m bo cht lng dch v, cht lng mng li
64 CHI NHNH VIN THNG TNH/THNH PH
m bo cc iu kin h tr cc n v t chc qun l khai thc,
pht trin mng li v t chc kinh doanh
B phn QL khai thc: -Vn hnh khai thc -iu hnh Vin thng - Qlmng li (Core) -Qun l mng Truy nhp - Qun l VAS v IN -Ban iu hnh vin thng II v III -Tng hp
Bo co th vic
KHI K THT
Nguyn Th Huyn Tho
V,
TRUNG TM HKT - CNG TY VIN THNG VIETTEL NM 2008
5.1. Chc nng, nhim v, quyn hn, mi quan h ca trung tmiu hnh k thut 5.1.1. Chc nng ca Trung tm HKT Trung tm iu hnh k thut l n v sn xut trc thuc Cng ty Vin thng Viettel, c chc nng:
1. Tham mu: Tham mu cho Ban Gim c Cng ty ch o, iu hnh qunl, khai thc v pht trin mng li k thut vin thng Viettel m bo hot ng xuyn sut v thng nht trn ton quc.
2. Qun l:+ Thc hin qun l, khai thc v pht trin h tng mng; s dng ti u ti nguyn mng, cc ngun lc ca ton trung tm mt cch hiu qu v thng nht trn ton mng m bo phc v tt cc nhim v kinh doanh ca Cng ty. + Qun l cc cng tc Ti chnh, T chc Lao ng tin lng, k hoch, hnh chnh, cng tc chnh tr t tng ti Trung tm theo phn cp ca Cng ty.
3. iu hnh: Ch o, iu hnh, n c v kim tra, gim st, cng tc khaithc, pht trin mng li v cng tc k thut lin quan trn ton mng.
4. Trin khai lp t pht trin mng: Trc tip iu hnh cng tc xy lp phttrin mng p ng kp thi mc tiu pht trin ca Cng ty v Tng Cng ty. 5.1.2. Nhim v ca Trung tm HKT: 1. Vn hnh khai thc v bo dng ton b h thng mng vin thng Viettel, bao gm cc h thng mng li, mng truy nhp, cc h thng gia tng gi tr m bo vic cung cp dch v ca Cng ty c thng sut, an ton, hiu qu, chnh xc v kp thi;
- 20 -
B phn khai thc: - Tnh cc - Thanh khon - Vn hnh khai thc B phn Qun tr: - Qun tr H thng. B phn pht trin: - Nghin cu gii php -Pht trin phn mm -Qun l cht lng
5. M HNH T CHC, CHC NNG NHIM
Phng K thut
TRUNG TM TIN HC TNH CC
Khai thc v h tr - Phng k thut - i QL khai thc H t - Phng Tng hp - Ban Ti Chnh.
Phng hoch
PG
Bo co th vic
Nguyn Th Huyn Tho
2. Qun l, iu hnh thng nht vic khai thc; gim st hot ng ca ton mng li, pht hin s c v trc tip iu hnh t chc CTT trn ton quc m bo mng li thng tin c thng sut; 3. iu hnh cng tc xy lp pht trin mng truy nhp, mng li trn ton quc. 4. m bo cung cp vt t, trang thit b k thut phc v cho cng tc vn hnh, khai thc, bo hnh bo dng, sa cha v pht trin mng li trn ton quc; Qun l v thc hin cc cng tc Ti chnh, T chc Lao ng tin lng, k hoch, hnh chnh, cng tc chnh tr t tng ti Trung tm theo phn cp ca Cng ty. 5. Thc hin ch bo co v chc nng nhim v ca Trung tm theo quy nh. 5.1.3. Quyn hn v trch nhim ca Trung tm HKT: 1) c quyn quan h vi cc c quan, n v trong v ngoi Cng ty trong vic qun l, iu hnh, khai thc v pht trin mng li k thut vin thng Viettel Telecom theo phn cp, y quyn. 2) c quyn xem xt, quyt nh gii quyt cc vn lin quan n qun l, iu hnh, khai thc v pht trin mng li k thut vin thng Viettel Telecom theo quy nh phn cp, y quyn. 3) c quyn qun l, ch o iu hnh v cng tc vn hnh khai thc, pht trin mng li k thut vin thng Viettel Telecom theo quy nh phn cp, y quyn. 4) c quyn qun l v cng tc h tr: T chc Lao ng, Hnh chnh, Ti chnh, Vt t ti sn trang thit b ton Trung tm theo quy nh phn cp, y quyn. 5) Qun l, iu hnh khai thc, pht trin mng li v cc mt cng tc khc m bo khai thc hiu qu mng li, nng cao cht lng dch v, thc hin ng cc quy nh ca Cng ty, Tng Cng ty v Nh nc; 6) Tuyt i bo m b mt thng tin mng li ca Cng ty.
- 21 -
Bo co th vic 5.1.4. Mi quan h ca Trung tm HKT:
Nguyn Th Huyn Tho
1) Chu s ch o, ch huy trc tip ca Ban Gim c Cng ty. 2) Chu s ch o, qun l, hung dn, kim tra, nh gi v chuyn mn nghip v ca cc Phng Ban Cng ty v Tng Cng ty. 3) Phi hp hip ng vi cc C quan, n v trong Cng ty qun l khai thc, pht trin v kinh doanh c hiu dch v vin thng Viettel. 4) Qun l, ch o iu hnh cc Trung tm k thut HNI, HCM, NG v cc Trung tm K thut Vin thng Tnh/Tp v cc ni dung c phn cp.
- 22 -
M HNH T CHC TRUNG TM IU HNH K THUT 2008GIM C TRUNG TMHy ni theo cch ca bn
(TO C THNG)PG TT (Nguyn Hong Chng)
PG TT
PG TT
PG TT
( Mnh Hng)
(H Minh Tun)
(o Xun V)Ban iu
Phng Mng li1.Ban NSS 2. Ban BSS 3. Ban Roaming Quc T. 4. Ban IN 5. Ban IP Core
Phng Hu tuyn
Phng VAS
Phng V tuyn1.Ban Quy hoch v thit k; 2.Ban Kim sot cht lng mng (QoS)
Phng Cng ngh Thng tin
Phng Pht
Phng
Phng iu hnh vin thng1.Trc BSS 2. Trc NSS 3.Trc VAS-IN 4.Trc ADSL 5.Trc PSTN 6.Ban H tr Kthut 7. Ban iu hnh sa cha A&P
Phng Thit k ti u 1
Phng VHKT1
hnh k thut II, III1.Phng HVT; 2. Phng VHKT; 3. Phng TKT; 2. Phng T.hp; 3. i lp t mng core.
trin H tng Tng hp1. Ban t chc hnh chnh 2. Ban Ti Chnh 3. Ban h tr tnh 4. Tr l k hoch tng hp
1.Ban Internet; 2.Ban PSTN v mng ngoi vi
1. Ban Qun tr h thng; 2. Ban An ninh mng;
1. Ban H tng. 2. Ban Thm nh 3. Ban D n 4. Ban m bo 5. i xy dng mng core
1. Ban Thit k. 2. Ban Ti u
1.i khai thc; 2.Ban cu hnh tch hp; 3. Ban ngun.
Lp Back Office
Lp chc nng, m bo
Lp khu vc: thc hin, iu hnh
Ban Gim c TTKTVT tnh/tp
Phng Tng hp
Phng K thut
Ban Ti Chnh
i QLKT H tng
- 23 -
Lp hnh ng TTKTVT tnh/Tp
- 24 -
M HNH T CHC BAN IU HNH KHU VC NM 2008
BAN IU HNH KTHUT
Phng iu hnh Vin thng khu vc - Trc gim st mng li ti khu vc 24/24 - Tip nhn thng tin v li, s c trn mng ti khu vc, phn tch iu hnh CTT - Thc hin ch bo co
Phng Vn hnh khai thc - Qun l khai thc thit b Tng trm - Vn hnh khai thc thit b mng li - u ni, khai bo ni, ngoi mng - Tch hp, thay i cu hnh, chuyn trm BTS
Phng Thit k ti u - Quy hoch mng li ton khu vc - Thit k, ti u mng li cho ton khu vc - Hng dn, h tr cc TT K thut ca CN thuc khu vc Phng Tng hp KH tc nghip, KH SXKD; TCL tin lng; Hnh chnh. Kho, vt t; i lp t mng core Thc hin xy lp mng core theo k hoch ca Cng ty; Thc hin cc th tc gim st, hon cng thanh quyt ton;
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Bo co th vic
Nguyn Th Huyn Tho
5.2. Nhim v, m hnh phng thit k ti u I (KV1) thuc trung tm HKT 5.2.1. Nhim v 5.2.1.1. Ban Thit k: - Nhim v thit k tn s: + Chu trch nhim quy hoch, thit k tn s v cc thng s khai bo CDD; + Nghin cu thit k mng theo quan im mt li cho cc tnh ph trch; + Kim tra, kho st nh trm v thit k Call-off GSM, MW; - Qun l v quy hoch truyn dn viba: + Chu trch nhim qun l, thit k qui hoch tn s viba, ti u ho cho cc tuyn truyn dn viba kt ni cc trm BTS; + Kim tra v tp hp cc thit k viba cung cp cho Cng ty Cng trnh; + Kt hp Cng ty truyn dn cp nht s truyn dn ton khu vc phc v cng tc iu hnh mng li v CTT; - Tng hp v cp nht c s d liu Homephone. 5.2.1.2. Ban Ti u: - Chu trch nhim theo di, kim sot v nng cao cht lng mng; - xut cc phng n thit k, iu chnh tham s mng ti u cht lng v dung lng mng; - Quy hoch v nh c ti nguyn v tuyn; - o to, hng dn nghip v thit k v ti u cho cc TT KTVT tnh/tp trong khu vc; - a ra cc nh hng, khuyn ngh ti u tng th v xuyn sut thng nht trn ton mng.
- 26 -
Bo co th vic
Nguyn Th Huyn Tho
5.2.2. M hnh t chc.PHNG TKTU 1
Ban Ti u
Ban Thit K
Nhm ti u 1
Nhm ti u .
Nhm ti u 5
- 27 -
Bo co th vic
Nguyn Th Huyn Tho
PHN 2: CHUYN BO CO TH VIC IU KHIN CNG SUT2.1 Gii thiu 2.1.1 nh nghaiu khin cng sut BTS (MS) l cng sut BTS (MS) c iu khin trong sut qu trnh kt ni.
2.1.2 Mc ch: Duy tr kt ni vi gi tr cht lng v cng tn hiu mong mun Gim nhiu: nhn c trn MS (BTS). - Tng s MS (BTS) c mc C/I tt nht. Li ch thu c l gim thiu mc nhiu nn ton mng (I). Gim cng sut tiu th:-
Khi iu khin cng sut BTS (MS) c s dng trn tt c cc
BTS (MS) trong mng, tng s cng sut pht s gim khi so snh vi khng c iu khin cng sut. iu ny cho thy nhiu ng knh v nhiu cn knh ng downlink trong mng gim.-
Trong trng hp b mt in ngun, trm pht s phi s dng
ngun cquy d phng. Khi iu khin cng sut BTS (MS) c s dng th cng sut tiu th cquy s gim v thi gian thoi s c th tng ln ti a.o
Tng kh nng s dng li tn s trong mng (kt hp cng vi nhy tn v pht khng lin tc DTX)
2.2 M t k thut 2.2.1 M t chung:-
iu khin cng sut c thc hin trn knh TCH v SDCCH
(bt tham s SDCCHREG)
- 28 -
Bo co th vic -
Nguyn Th Huyn Tho
Ton b TS trn knh BCCH c pht vi cng sut ti a v REGINDL: l thi gian gia 2 ln iu chnh cng sut n
khng c iu khin cng sut trn cc knh ny-
v l chu k khung SACCH (n*480 (ms)).
2.2.2 i tng ca iu khin cng suti tng ca thut ton iu khin cng sut l s xp xp iu ng cng sut ra ca trm BTS sao cho cng tn hiu thu c mi MS c iu khin bi BTS. Cng sut u ra BTS v cng tn hiu trong MS i vi suy hao ng truyn gia MS v BTS, BTS ch c th truyn ti cc mc cng sut ring bit. Cng tn hiu pht ca BTS, cht lng tn hiu thu c lin quan cht ch vi phn suy hao tn hiu th hin nh hnh 2.1 (Cht lng khng c a vo tnh ton).
Hnh 2. 1: Tng quan gia cng sut u ra ca BTS v cng tn hiu ca MS so vi suy hao ng truyn. Khi mt kt ni c tn hao ng truyn thp (phn bn tri ca hnh), BTS truyn ti mc cng sut thp nht c th ca n. Mc d MS nhn c tn hiu vt qu gi tr mong mun, BTS vn khng th gim cng sut pht thp hn na (min). Ngc li, khi kt ni c tn hao ng truyn cao (phn bn phi ca hnh), BTS s pht ti mc cng sut ti a cho php i vi cell. Cng sut pht lc ny khng th tng hn na mc d cng tn hiu nhn c MS thp (max). Vic iu khin y l khng tuyn tnh m theo hnh bc thang. Mc iu chnh cng sut b gii hn trong khong 0 30dB.
- 29 -
Bo co th vic
Nguyn Th Huyn Tho
Khi 1 cht lng c xt ti th vic iu chnh cng sut u ra ln hay xung ph thuc vo cht lng (xem hnh 2.2).
Hnh 2. 2 Tng quan gia cht lng (rxqual) v cng sut pht BTS. Khi cht lng c a vo tnh ton, cng sut u ra c iu chnh tng hoc gim ph thuc vo cht lng nhn c. Cng sut trm pht do s thay i vi cht lng o c bi MS. Khi MS c rxqual thp (cht lng cao), BTS pht cng sut thp v khi MS c rxqual cao, BTS pht cng sut cao. Rxqual cng cao th cng sut pht cng cao v ngc li. Nu ch xt trong phm vi 1 cell th cng sut tng ko theo C/I tng, nhng trong phm vi nhiu cell cnh nhau th cng sut cao s lm tng nhiu do nh hng gia cc cell xung quanh -> C/I gim.
2.3 Thut ton iu khin cng sut ca BTS:Do thut ton iu khin cng sut ca BTS v MS l ging nhau nn y trnh by chi tit thut ton iu khin cng sut ca BTS. Thut ton iu chnh cng sut BTS ng bao gm 3 bc:
2.3.1 Chun b d liu u vo:Mc cng sut u ra s dng bi BTS (TRU) ti chu k SACCH th k, c k hiu bng PLused vi bc nhy 2dB gim dn t mc cng sut u ra t ban u: BTS (TRU) output power (k) (dBm) = BSPWRT - 2 * PL used (2.1) c th s dng cht lng mong mun (QDESDL) v rxqual o c trong cc tnh ton, c hai phi c chuyn i sang C/I vi n v dB theo bng 2.1.
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Bo co th vic
Nguyn Th Huyn Tho
Php nh x gia rxqual v C/I l khng tuyn tnh do cn s iu chnh nhanh hn cho cc gi tr rxqual cao v thp. Bng 2. 1 Mi quan h nh x khng tuyn tnh gia rxqual v C/I QDESDL [dtqu] Rxqual C/I [dB] 0 0 23 10 1 19 20 2 17 30 3 15 40 4 13 50 5 11 60 6 8 70 7 4
* Mt lng b c tnh ton trc khi lc kt qu o: Nu c nhy tn v MS o trn knh BCCH: SS TCH = SS M - (BSPWR-BSTXPWR +2*PL used ) / Nf (2.2)
Trong SSTCH l cng tn hiu trn cc sng mang TCH iu chnh xung, SSM l cng tn hiu o c bo co bi MS, BSPWR l cng sut u ra ca BTS trn tn BCCH trong LRP, BSTXPWR l cng sut u ra BTS trn tn TCH trong LRP, v Nf l s tn s trong chui nhy tn. Tt c cc o c cng tn hiu c b trc khi lc. Tnh ton b cng tnh hiu trong cc trng hp cn li: SS_COMP = SS TCH + 2* PL used tn. Nu BSC khng nhn c kt qu o t BTS, khng nn iu chnh cng sut vi kt ni . Cng thi im, b m REGINTDL b treo. Khi nhn c kt qu o tr li, iu chnh cng sut v b m REGINTDL c phc hi li. B lc cng tn hiu s khng c cp nht khi cc kt qu cng tn hiu (o trong bo co o c) b mt. iu ny c ngha l u ra t b lc SS b gi cho n khi nhn c gi tr tip theo. Vic mt cc gi tr cht lng trong bo co o c c t ti gi tr xu nht c th. iu ny c ngha l vic mt cc gi tr cht lng c th hin nh rxqual = 7. Nu thng tin v mc cng sut BTS s dng b mt trong bo co o c, cc gi tr b mt ny c t cho mc cng sut tnh ton cui cng. (2.3)
Trong SS_COMP l cng tn hiu b vi c iu chnh xung v nhy
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Bo co th vic
Nguyn Th Huyn Tho
2.3.2 Lc kt qu o
Lc cng tn hiu: c thc hin bng mt b lc hm m khng tuyn tnh theo cng thc: SS FILTERED (k) = b * SS_COMP(k) + a * SS FILTERED (k-1) Trong : If Then Else SSFillted l b cng tn hiu lc vi iu chnh xung. a, b l cc h s b lc v c xc nh: b = 1-a, cn a ph L xc nh nh sau: SS_COMP(k) < SS FILTERED (k-1) L = SSLENDL L = SSLENDL * UPDWNRATIO / 100 (2.5) (2.4)
thuc vo di b lc (L).
n v: tnh theo chu k SACCH (480ms). Khi chiu di vt qu 30 chu k SACCH, th chiu di ny c t l 30. c th tnh ton v gi mc cng sut ngay sau khi n nh knh hoc handover, b lc c c khi to vi SS FILTERED (k-1) = SSDESDL . iu ny dn ti vic iu chnh bt u ngay sau bo co o c u tin c gi tr. UPDWNRATIO c th t.
Lc cht lng tn hiu: cng c thc hin tng t nh lc cng v theo cng thc: Q FILTERED (k) = b * Q_COMP(k) + a * Q FILTERED (k-1) Trong : C/I. if then Cc h s b lc a,b c xc nh nh lc SS. L (chiu di b lc) c xc nh: Q_COMP(k) < Q FILTERED (k-1) L = QLENDL (2.8) Q FILTERED l b cht lng b lc vi iu chnh xung. Q_COMP l phn b cht lng theo cng thc: Q_COMP = RXQUAL_dB + 2*PL used (2.7) RXQUAL_dB chnh l gi tr rxqual o c chuyn sang dng (2.6)
- 32 -
Bo co th vic else
Nguyn Th Huyn Tho L = QLENDL * UPDWNRATIO / 100
c th tnh ton v gi mc cng sut ngay sau khi cp pht knh hoc handover, b lc cht lng c khi to vi Q FILTERED (k-1) = QDESDL_dB.
2.3.3 Tnh ton iu chnh mc cng sutVic tnh ton mc cng sut c tin hnh trong 3 bc: 2 mc cng sut c bn c tnh ton Mc c nh c dng D liu u ra cui cng c chuyn i thnh n v mc cng sut trc khi n c truyn ti BTS nh mt mc cng sut. Thng tin thc t gi cho BTS l mc cng sut PL used Mc cng sut c bn cho iu chnh (pu 1 v pu 2) c tnh ton theo biu thc sau: pu i =i
* (SSDESDL - SS FILTERED ) + v
i
* (QDESDL_dB - Q FILTERED )
(2.9)
Vi i = 1, 2 trong i 1 1 2 2 i
c xc nh nh sau: (b suy hao) (b cht lng) (b suy hao) (b cht lng)i
= LCOMPDL / 100 = QCOMPDL / 100 = 0.3 = 0.4 and
Tham s1
i
iu khin vic b suy hao v cht lng. Tham s
1
and2
c th t bng trung bnh ca LCOMPDL and QCOMPDL trong khi tham s2
and
l c nh. Cc gi tr ny c ti u t c mc iu chnh hng ti2
nhiu nn thp m khng nh hng cht lng. Tuy nhin vic t vic iu chnh gn ti mc nhiu nn.
and
2
khng
phi l then cht khi cc tham s ny n thun ch cung cp nh mt gii hn cho Mc cng sut cui cng ny c gi l mc cng sut t nhin pu: pu = max(pu 1 ,pu 2 ) * Chuyn i d liu u ra: Mc cng sut mi c chuyn i t t l dBm bn trong thnh k hiu PLused trc khi n c th c truyn ti BTS. Trong thc t iu ny c ngha l mc cng sut bt buc c quy ra bc tng l 2dB theo 2.11: (2.10)
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Bo co th vic PLused = Int(-pu/2 ) [0..15] 15 ngha l iu chnh xung 30dB.
Nguyn Th Huyn Tho (2.11)
Trong PLused l mc cng sut. PLused = 0 ngha l cng sut y v PLused =
2.4 Thut ton iu khin cng sut ca MS:Do thut ton iu khin cng sut ca BTS v MS l ging nhau nn y ch trnh by nhng im khc ca thut ton iu khin cng sut ca MS so vi thut ton iu khin cng sut ca BTS. Thut ton iu chnh cng sut MS ng cng bao gm 3 bc nh iu khin cng sut BTS.
2.4.1 Chun b d liu u vo:Cng tn hiu o c SSM c b cho iu khin cng sut theo phng trnh 2.12: SS_COMP = SSM +[min(MSTXPWR, MSPWRMAX) PWR_U] Vi: SS_COMP l cng tn hiu c b cho vic iu chnh xung; PWR_U l cng sut u ra s dng bi MS trong sut chu k o; MSTXPWR l cng sut pht ti thiu cho php ca MS trong subcell hin ti; MSPWRMAX l cng sut u ra ln nht ty theo lp cng sut. Khong thi gian gia 2 ln iu khin cng sut lin tip l REGINUL. c th s dng cht lng mong mun (QDESUL) v rxqual o c trong cc tnh ton, c hai phi c chuyn i sang C/I vi n v dB theo bng 2.2. Php nh x gia rxqual v C/I l khng tuyn tnh do cn s iu chnh nhanh hn cho cc gi tr rxqual cao v thp. Bng 2. 2 Mi quan h nh x khng tuyn tnh gia rxqual v C/I QDESUL [dtqu] Rxqual C/I [dB] 0 0 23 10 1 19 20 2 17 30 3 15 40 4 13 50 5 11 60 6 8 70 7 4 (2.12)
2.4.2 Lc kt qu oCng tng t bc lc kt qu trong thut ton iu khin cng sut ca BTS v s dng b lc hm m khng tuyn tnh. Lc cng tn hiu: tng t ca iu khin cng sut ca BTS.
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Lc cht lng tn hiu: cng c thc hin tng t nh lc cng v theo cng thc: Q FILTERED (k) = b * Q_COMP(k) + a * Q FILTERED (k-1) Trong : C/I. if then else Cc h s b lc a,b c xc nh nh lc SS. L (chiu di b lc) c xc nh: Q_COMP(k) < Q FILTERED (k-1) L = QLENUL L = QLENUL * UPDWNRATIO / 100 (2.14) Q FILTERED l b cht lng b lc vi iu chnh xung. Q_COMP l phn b cht lng theo cng thc: (2.13) RXQUAL_dB chnh l gi tr rxqual o c chuyn sang dng (2.6)
Q_COMP = RXQUAL_dB + (min(MSTXPWR, MSPWRMAX) PWR_U)
c th tnh ton v gi mc cng sut ngay sau khi cp pht knh hoc handover, b lc cht lng c khi to vi Q FILTERED (k-1) = QDESUL_dB.
2.4.3 Tnh ton iu chnh mc cng sutVic tnh ton mc cng sut c tin hnh trong 3 bc tng t nh iu khin cng sut ca BTS. Thng tin thc t gi cho MS l mc cng sut PWR_CL. Mc cng sut c bn cho iu chnh (pu1 v pu2) c tnh ton theo biu thc sau: pu i =i
* (SSDESUL - SS FILTERED ) + v
i
* (QDESUL_dB - Q FILTERED )
(2.15)
Vi i = 1, 2 trong i 1 1 2 2 i
c xc nh nh sau: (b suy hao) (b cht lng) (b suy hao) (b cht lng)
= LCOMPUL / 100 = QCOMPUL / 100 = 0.3 = 0.4
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Bo co th vic Tham s1 i
Nguyn Th Huyn Thoi
and
iu khin vic b suy hao v cht lng. Tham s
1
and2
c th t bng trung bnh ca LCOMPUL and QCOMPUL trong khi tham s2
and
l c nh. pu = max(pu1, pu2) (2.16)
Mc cng sut cao nht (iu chnh xung nh nht) s c s dng: Mc cng sut iu chnh c tnh ton s c lm trn ln gn nht vi s nguyn chn theo cng thc: puint = int (pu/2) * 2 Nu cng sut iu chnh ( puint) ln hn bng 0 th bc cng sut s l: PWR_O = MSTXPWR Ngc li th bc cng sut s l: PWR_O = MSTXPWR + puint * Chuyn i d liu u ra: Mc cng sut mi c chuyn i t t l dBm bn trong thnh k hiu PWR_CL theo tiu chun 3CPP trc khi n c th c truyn ti MS. (2.19) (2.18) (2.17)
2.5 Th tc iu chnhKhi kt ni TCH c thit lp, BTS lun pht cng sut u ra cc i c t trc, v d trong trng hp sau: Cp pht mt knh TCH. Cp pht li hoc HO li HO ni cell v thay i subcell HO lin cell.
Vic iu chnh xung lun lun bt u sau bn tin o c c gi tr u tin. Thi gian hi p cho vic iu chnh ln c iu khin bi tham s QLENDL v SSLENDL. QLENDL xc nh thi gian hi p khi nhiu cao v SSLENDL trong rt do cng tn hiu. Cc gi tr QLENDL and SSLENDL tng ng vi 90% thi gian tng ca cc b lc hm m. Thi gian hi p cho vic iu chnh xung c xc nh bi biu thc QLENDL*UPDWNRATIO /100 v SSLENDL*UPDWNRATIO /100 trong
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UPDWNRATIO l t s gia tc iu chnh ln v xung. Cc kt qu ny cho thy iu chnh ln nhanh v iu chnh xung chm hn. Khi mt mc cng sut c gi i, n mt khong thi gian l s chu k knh SACCH REGINTDL trc khi mc cng sut tip theo c th gi. Nu mc cng sut ny khc vi mc cng sut trc, n s c gi. Nu khng khc, mt mc mi s c tnh ton theo chu k knh SACCH cho n khi thu c mc cng sut mi khc vi mc c. Sau mc cng sut mi ny c gi i, v tri qua mt s chu k knh SACCH REGINTDL trc khi mc cng sut mi c th c gi li.
2.6 iu khin cng sut AMR FR 2.6.1 Tng quanAdaptive Multi Rate - AMR : AMR l mt ch m ho ti ra kh nng cho cht lng thoi tt khi t s C/I thp, trong sut cuc gi s dng AMR tc m ho thay i tu theo cht lng ca knh v tuyn. iu khin cng sut AMR c s dng c mc nhiu nh nht i vi kt ni s dng AMR FR bng cch gim cng sut u ra ca kt ni .
2.6.2 Thut ton iu khin cng sut AMR FRThut ton iu khin cng sut AMR FR da trn c s thut ton iu khin cng sut ng BTS v iu khin cng sut ng MS. M ha thoi AMR FR thit thc hn khi mc t s C/I thp. iu ny lm cho vic thit lp cc thng s ca iu khin cng sut AMR FR linh hot hn so vi iu khin cng sut khng s dng AMR FR. 2 thng s c thit lp cng sut ca kt ni AMR FR c tnh theo cng thc 2.12. pu i =i
l
SSDESDLAFR v QDESDLAFR iu khin cng sut ng BTS. Do vy 2 bc * (SSDESDLAFR - SS FILTERED ) + * (QDESDLAFR_dB - Q )
i
FILTERED
(2.12) vi i = 1,2
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2.7 iu chnh cc tham sCc tham s c iu chnh: SSDESDL v QDESDL QCOMPDL v LCOMPDL Cch tt nht hiu vn ny l miu t thut ton bng hnh nh trong khng gian 3 chiu . t cht lng (rxqual ) v cng tn hiu (rxlev) lp thnh mt mt phng 2 chiu (iu khin cng sut BTS khng c kch hot v gi nguyn tt c lu lng trong mng). Khi iu khiu cng sut BTS c kch hot, b mt mt phng khi s ni ln vi cc gi tr ca rxqual and rxlev, ni m thut ton cho php iu chnh xung. Xem hnh 3 di hiu hn v nguyn l iu chnh ny:
Hnh 2. 3: Nguyn l iu chnh xung Nh hnh ta thy b mt bt u tng ln vi rxlev > 14 v rxqual < 5. Kt ni ng xung vi MS trong khu vc ny l iu chnh xung. Mc iu chnh c hin th trn trc Z. Ch rng rxqual and rxlev trong hnh tng ng vi cc gi tr o nhn c t bo co o c trc khi bt k gi tr b no c thc hin.
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Vi gi tr t c khuyn ngh, SSDESDL and QDESDL c t ln lt l -90 v 30. Hai gi tr ny xc nh im (nh du 1 trong hnh) trong mt phng 2 chiu (cht lng v SS) 2 mt phng ring bit (nh du 2 v 3 trong hnh) ca thut ton gp nhau. Mt phng 2 iu chnh MS hng ti mc nhiu sn (SS thp) v mt phng 3 hng ti cht lng. V tr cc mt phng ny trong khng gian 3 chiu c xc nh bi SSDESDL and QDESDL. Ch rng hnh trn ch ra vic iu chnh xung m khng c s b qua mc cng sut, minh ho 2 thut ton khc nhau (cc mt phng). Cc tham s QCOMPDL and LCOMPDL quyt nh gc ca mt phng 3 hng ti mt phng 2 chiu (cht lng v SS). QCOMPDL t gc cng vi gi tr QDESDL v LCOMPDL t gc cng vi gi tr SSDESDL. Gc ca mt phng 2 l c nh.
Hnh 2. 4: t tham s va phi, linh hot hng ti iu chnh xung.
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Hnh 2. 5: t tham s va phi vi h s b suy hao LCOMPDL = 10.
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CHNG 3: IU KHIN CNG SUT TRONG CNG TC TI U MNG V TUYN 3.1 Mc tiu iu chnh cng sut:Khi tn hiu thu c ca MS t BTS nh, khng nn iu khin cng sut, v c th b rt cuc gi do tn hiu yu hoc do suddenly.Mc tn hiu ny nn nh hn hoc bng 86. Khi mc tn hiu thu c ln, nn gim mc cng sut ln.C ngha l ngng gim cn rng tng hiu qu iu khin cng sut (Nhng vn phi nm trong mc an ton)
3.2 Cc tham s la chn thut ton mng Viettel ang thc hin:Bng 3. 1: Tng hp cc tham s s dng trong thut ton Tn thng s SSDESDL (1) (dBm) QDESDL (dtqu) LCOMPDL (%) QCOMPDL (%) REGINTDL (Chu k SACCH) SSLENDL (Chu k SACCH) QLENDL (Chu k SACCH) SDCCHREG BSPWRMIN (dBm) BSTXPWR (2) (dBm) UPDWNRATIO (%) STEPLIMDL BSPWRT (dBm) BSPWR (dBm) Gi tr mc nh -70 20 70 30 5 5 8 OFF -20 200 OFF Gi tr khuyn ngh -90 30 5 55 1 3 3 ON -20 300 OFF Gi tr ti u Vng gi 86 30 10/20/70 55/60 1 3 3 ON -20 53 200 OFF 47/45 47/45 tr -110 to -47 0 to 70 0 to 100 0 to 100 1 to 10 3 to 15 1 to 20 ON, OFF -20 to +50 0 to 80 100 to 700 ON, OFF 0 to 80 0 to 80
SSDESDL: nh ngha gi tr ch ca cng tn hiu mong mun c o bi my thu ti MS nm ngoi bin iu chnh. Thng s ny c thit lp mc subcell.
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QDESDL: nh ngha gi tr mc cht lng mong mun c o bi my thu ti MS. N c o theo n v rxqual v chuyn i thnh n v dB trc khi s dng trong gii thut. Thng s ny c thit lp mc subcell. SSDESDLAFR: nh ngha gi tr cng tn hiu mong mun cho kt ni s dng AMR FR c o bi my thu ti MS ngoi bin vng iu chnh. Thng s ny c thit lp mc subcell. QDESDLAFR: nh ngha mc gi cht lng tn hiu mong mun c o bi my thu ti MS. N c o theo n v rxqual v chuyn i thnh n v dB trc khi s dng gii thut. Thng s ny c thit lp mc subcell. LCOMPDL: thng s nh ngha mc suy hao s c b trong gii thut c iu chnh theo cht lng. Thng s ny c thit lp mc subcell. QCOMPDL: thng s ny nh ngha b cht lng. Thng s ny trong khong 0 n 100 v c thit lp mc subcell. REGINTDL: nh ngha khong iu chnh. Thng s ny c thit lp mc subcell. SSLENDL: nh ngha chiu di b lc cng tn hiu. Thng s ny c thit lp mc subcell. QLENDL: nh ngha chiu di b lc cht lng tn hiu. Thng s ny c thit lp mc subcell. SDCCHREG: l kha iu chnh knh SDCCH. Thng s ny c thit lp mc subcell. BSPWRMIN: nh ngha mc cng sut u ra cho php nh nht ca BTS trn tn s TCH. Thng s ny c thit lp mc subcell. BSTXPWR: nh ngha mc cng sut ln nht cho php ca BTS subcell hin ti. UPDWNRATIO: t s gia tc iu chnh chiu tng v gim. STEPLIMDL: kha c th gii hn mc iu chnh xung l 2 dB chu k SACCH.
3.3 V d iu chnh b lc
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Thng thng khi iu chnh ln th b lc cht lng trong iu khin cng sut BTS l QLENDL c th c thit lp t 2 n 5. Do vy s tt hn c b lc cht lng iu khin cng sut ngn khi c cht lng xu iu khin nhanh hn. Thng khng thit lp QLENDL = 1. Thc t ch ra rng s khc nhau khi iu chnh QLENDL = 2 v QLENDL = 3 l khng ng k. V d: QLENDL l 2 v UPDWNRATIO l 300. iu ny c ngha l chiu di b lc cho iu chnh tng l 2 chu k SACCH v chiu di b lc cho iu chnh gim l 2*300% = 2*3 = 6 chu k SACCH. Khi n c s dng cho b lc cng tn hiu th vic iu chnh cng c thc hin tng t nh lc cng . Chiu di b lc iu chnh c thit lp bi thng s SSLENDL v vic iu chnh gim bng c thng s SSLENDL v UPDWNRATIO. UPDWNRATIO nn iu chnh cho lc cht lng. Nu iu chnh cho b lc cht lng, n cng c thc hin cho lc cng tn hiu. Do vy chiu di b lc c gi tr t 6 ti 9 nhng chiu di b lc c th di hn nu cn thit (xem hnh 3.1).
Hnh 3. 1: Khi cng tn hiu thp, tham s thit lp SSLENDL = 3 v UPDWNRATIO = 300 c s dng. Tham s c thit lp linh hot cho vic iu chnh xung 16dB trc khi xut hin cng tn hiu thp. trnh trng hp vic iu chnh khng n nh th vic iu chnh xung phi chm. Thc t thy rng chiu di b lc t 6 n 9 l tt. Tuy nhin c th s
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dng b lc di hn. Chiu di b lc khi iu chnh gim c xc nh bi thng s QLENDL v UPDWNRATIO. UPDWNRATIO thit lp mc iu chnh gim ca b lc c so snh vi mc iu chnh ln theo t l %. Thng s dng UPDWNRATIO cao thay v s dng STEPLIMDL (Xem hnh 3.2).
Hnh 3. 2: Bc p ng vi cht lng ti, thng s thit lp QLENDL = 3 v UPDWNRATIO = 300.
3.4 Th nghim thay i thng s iu khin cng sut ti HNI: 3.4.1 Mc ch th nghim: iu khin cng sut nhanh hn. Gim t l s mu c cng tn hiu qu ln gim nhiu nn.
Kt qu:
iu khin cng sut din ra nhanh hn T l s mu c cng tn hiu qu cao gim i ng k. ng DL/UL ch cn 14.01/1.27 so vi 22.68/2.63 trc y. Tuy nhin t l s mu c SS DL/UL < -95/-98dBm c xu hng tng ln (xu i), c th: 3.41/10.62 so vi 2.61/7.08. T l s mu c RXQUAL c xu hng xu i, c th 96.91/95.27 so vi 97.82/95.37. Ngha l nhiu nn khng gim i.
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Bng 3. 2: Bng tng kt Bc 1 Bc 2 (11h ngy 9/9) Bc 3 (6h30 ngy 10/9) UPDWNRATIO=100 Bc 4 (14h ngy 10/9) QCOMPDL=100 Bc 5 (9h ngy 11/9) QLENDL/UL = 1
SSDESDL/UL=90/100 LCOMPDL=10, QDESDL/UL=40/40 QCOMPDL=75 % S mu c SS DL/UL < -95/98 dBm % S mu c SS DL/UL> -65dBm % s mu c RXQUAL DL/UL
