chuong5_phan2

7/24/2019 chuong5_phan2

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Chng 5. H thng thng tinv tuyn

Thng tin di ng


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Ni dung

Tng quan v thng tin di ng H thng thng tin di ng GSM


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Tng quan v thng tin di ng

Lch s pht trin Cu trc h thng T bo

a truy nhp


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Lch s pht trin

Gii thiu chung:

H thng thng tin di ng t bo s (Digital Cellularmobile communication systems) hay cn gi l h thngthng tin di ng (mobile systems) l h thng lin lc

vi nhiu im truy nhp khc nhau (access points, orbase stations) trn mt vng a l hay cn goi l cc cell.

Ngui s dng c th di chuyn trong vng ph sng cacc trm (base station)


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Lch s pht trin

Ra i vo nhng nm 1920 ( l cc phng tin thng tingia cc n v cnh st M )1982 s dng k thut TDMA l Nhm c trch di ngGSM (Group Special Mobile) sau ny c i thnh Hthng di ng ton cu (Global System for Mobilecommunications

Vit Nam s dng GSM t 19931991 Qualcomm trin khai h thng di ng trn cng nghCDMA chun IS-95A (Interim Standard-95A)Vit Nam trim khai h thng di ng theo cng nghCDMA v a vo s dng thng 7/2003


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Lch s pht trin

Cc th h :Th h th nht (1G)

Th h th hai (2G)Th h th ba (3G)

Th h th bn (4G)


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Lch s pht trin

First Generation (1G)

H thng thng tin di ng tng t s dng phng thca truy nhp phn chia theo tn s FDMA v iu ch tn

s FM.c im:Phng thc truy nhp:Dch v n thun l thoi

Cht lng thp

Bo mt km

FDMA


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Lch s pht trin

Mt s h thng in hnh:

NMT:Nordic Mobile Telephone s dng bng tn 450

MHz. Trin khai ti cc nc Bc u vo nm 1981

(Scandinavia)

TACS: Total Access Communication System trin khai ti

Anh vo nm 1985.

AMPS: Advanced Mobile Phone System trin khai ti Bc

M vo nm 1978 ti bng tn 800 MHz.


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Lch s pht trin

Second Generation (2G)

H thng di ng s t bo:

Dung lng tng

Cht lng thoi tt hn

H tr cc dch v s liu (data)

Phng thc truy nhp:

TDMA, CDMAbng hp (NarrowBand)

Chuyn mch: chuyn mch knh (Circuit Switching).


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Lch s pht trin

Mt s h thng in hnh:

GSM: (Global System for Mobile Phone) - TDMA. Trin

khai ti Chu u.

D-AMPS (IS-136 - Digital Advanced Mobile Phone System) TDMA. Trin khai ti M

IS-95 (CDMA one) - CDMA. Trin khai ti M v HnQuc.

PDC (Personal Digital Cellular) TDMA, Trin khai tiNht Bn.


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Lch s pht trin

Evolved Second Generation (2.5 G)

Cc dch v s liu ci tin :

Tc bit data cao hn.

H tr kt ni Internet.

Phng thc chuyn mch:

Chuyn mch gi - Packet Switching

V d:

GPRS - General Packet Radio Services: Nng cp t mng GSM nhm h tr

chuyn mch gi (172 kbps).

EDGE - Enhance Data rate for GSM Evolution

H tr tc bit cao hn GPRS trn nn GSM (384 kbps)


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Lch s pht trin

Third Generation (3G)

H tr cc dch v s liu gi tc cao:

Di chuyn trn cc phng tin (Vehicles):

144 kbps - Macro Cell

i b, di chuyn chm (Pedestrians):

384 kbpsMicro cell

Vn phng ( Indoor, stationary users)

2 Mbps - Pico cell

Dch v a phng tin, kt ni qua Internet, v d nh:Video Streaming, video conference, web browsing, email,

navigational maps . .


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Lch s pht trin

Third Generation (3G)

Hai hng tiu chun cho mng 3G:

W-CDMA: UTMS:

Pht trin t h thng GSM, GPRS

CDMA 2000 1xEVDO:

Pht trin t h thng CDMA IS-95


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Lch s pht trin

Fourth Generation (4G)

Hin nay ang xy dng chun.

Ci tin v dch v d liu:

Tc bit: 20 100 Mb/s.

Phng thc iu ch:

OFDM, MC-CDMA

Xu hng kt hp: mng li IP + mng truy nhp di ng

(3G) v truy nhp v tuyn Wimax & Wi-Fi !


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Cu trc h thng

HLR:b ng k nh vthng tr

MSC: Trung tm chuyn

mch di ng

VLR:b ng k nh v tm tr

AuC: Trung tm nhn thc


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Cu trc h thng

Trong :

HLR: l mt CSDL qun l cc thu bao di ng, chacc thng tin nh IMSI, MSISDN, VLR no ang phtrch thu bao,..

VLR: l bn sao ca HLR cho vng phc v, cha thng tin tmthi ca MS lm khch ti MSC hin ti

AuC: Trung tm nhn thc: cha cc thng tin cn thit m bovic nhn thc v m ha gia MS v trm gc

MSC: Trung tm chuyn mch di ng: thc hin vic nhtuyn cuc gi n hoc t ngi s dng v cc mng in

thoi khc nhau nh PSTN, hay mng di ng khc


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Khi nim t bo

Cell t bo hay : l n v c s ca mng, ti

trm di ng MS tin hnh trao i thng tin

vi mng qua trm thu pht gc BTS (BS).Trong :

MS: Mobile Station - trm di ng.

BTS (BS): Base Tranceiver Station (Base Station)


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Cc phng php a truy nhp

FDMA: Frequency Division Multiple Access

a truy nhp phn chia theo tn s

TDMA: Time Division Multiple Accessa truy nhp phn chia theo thi gian

CDMA: Code Division Multiple Accessa truy nhp phn chia theo m


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Cc phng php a truy nhp

Mobile Station

Base Station

Mobile StationMobile Station

Mobile Station

Forward link

Reverse link


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FDMA (Frequency Division Multiple Access)

Da trn FDM (Frequency Division Multiplexing)

k1 k2 k3 k4 k5 k6

f1

f2

f3

f4

f5

f6

s khong bo v

s

FDMA

t

f

k1

k2

k3

k4

k5

k6


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FDMA (tip)

A A

B B

C C

Time

f2

f1

f0


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TDMA (Time Division Multiple Access)

Da trn TDM (Time Division Multiplexing)

k1 k2 k3 k4 k5 k6

f1

t

f

k1 k2 k3 k4 k5 k6 k1

TDMA


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TDMA (tip)

C B A C B A C B A C B A

C

A

B

Time

f0


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CDMA (tip)

Sender Receiver

Code A

A

Code B

B

AB

AB

C

BC

A

Code A

AB

C

Time

BC

B

A

Base-band Spectrum Radio Spectrum

spread spectrum


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So snh a truy nhp


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-

-

Bng tn ca h thng

Mi h thng thng tin di ng c cp pht mthoc nhiu bng tn xc nh.

Trong mi bng tn, cc knh v tuyn ca h

thng s c n nh.V d: Bng tn GSM 900 c cp pht l

UL: 890 MHz915 MHz

DL: 935 MHz960 MHz


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Ni d


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Ni dung

1. Gii thiu v h thng GSM2. Cu trc h thng GSM3. Phn cp vng phc v4.

Di tn s v knh5. Khi nim s dng li tn s6. Mt s th tc trong mng

7. Nhn thc v mt m trong GSM

1 Gii thi h th GSM


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1. Gii thiu v h thng GSM

GSM : Global System for Mobile communication l

chun ca ETSI c thit k xy dng hthng thng tin di ng s th h 2 (2G).

L h thng thng tin di ng s s dng phngphp a truy nhp FDMA kt hp vi TDMA.

Cc dch v GSM cung cp: Thoi di ng in thoi khn cp S liu tc thp Bn tin ngn

1 Gii thi h th GSM


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1. Gii thiu v h thng GSM

c im: Dung lng tng nh k thut s dng li tn s. Cho php chuyn giao Cht lng m thoi tt

C th s dng ton cu Tng thch vi cc mng khc L cng ngh thnh cng trong vic a vo

thng mi ha. S lng thu bao GSM l rt ln (c 6 t hin

nay)

2 C t h th GSM


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2. Cu trc h thng GSM

H thng thng tin di ng s mt t

(PLMN) theo chun GSM c cu trc baogm cc phn sau: Trm di ng: MS H thng chuyn mch: SS H thng trm gc: BSS H thng vn hnh v bo dng: OMS

2 C t h th GSM


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2. Cu trc h thng GSM

SS

H thng chuyn

mch

H thng trm gc

SS: Switching Subsystem

BSS: Base Station SubsystemOMS: Operation and Maintenance SubsystemMSC: Mobile Switching CenterEIR: Equipment Identity RegisterHLR: Home Location Register

VLR: Visitor Location Register

MS: Mobile StationBSC: Base Station ControllerBTS: Base TransceiverStation

AuC: Authentication Center.. Kt ni thng tin bo hiu, iu khin

Kt ni thng tin ngi s dng, bo hiu

H thng vn hnhv bo dng

Trm di ng

H thng chuyn

mch

2 1 Th b di


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2.1 Thu bao di ng MS: Mobile Station = Mobile Equiment + SIM

Thit b di ng(ME: Mobile Equiment) L thit b in thoi t ong thc s

Mi thit b phn bit nhau bi s nhn dng thit b di ng: IMEI(International Mobile Equipment Identity)

Bao gm cc phn: x l truyn dn v tuyn, keypad, display,

speaker v microphone Giao din cho cc dch v ph nh Fax hay s liu (Cc giao din kt ni

Blutooth, IrDA, cc giao tip ni tip khc)

C 5 mc cng sut dng cho MS di 900MHz 20, 8, 5, 2, 0.8 Watt thng thng8W s dng cho cc thit b di ng

trn xe v 0.8W dng cho cc thit b cm tay Di 1800MHz c hai mc cng sut: 1 v 0.25W

Hin nay cc ME thng c chto hot ng hai di tn 900 v1800 ng thi c th p ng c cc dch v cho thh mi (nh3G)

2 1 Th b di


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2.1 Thu bao di ng Thnh phn th hai ca MS l modun nhn dng thu

bao: SIM (Subscriber Identity Module ) SIM th c gi l mt th thng minh (smartcard)

n c : CPU, h thng bus ni RAM v EEPROM v cc giaodin in

SIM cha cc thng tin sau: IMSI (International Mobile Subscriber Identity): s nhn dng

thu bao di ng quc t 15-digit bao gm Mobile CountryCode, Mobile Network Code, Mobile Subscriber IdentificationNumber.

c gi khi MS vo mng hay thc hin thao tc cp nhnv tr.

MSISDN : S ISDN ca thu bao di ng - s ny khngc nh tuyn trong mng di ng.


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2 2 H thng t m gc


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2.2 H thng trm gc

y l thnh phn c trng cho h thng

thng tin di ng

Bao gm cc phn:

Trm thu pht gc (BTS): B pht, b thu, anten

B iu khin trm gc (BSC): chuyn mch giacc BTSs, iu khin BTSs, qun l ti nguynmng, chuyn i cc knh v tuyn thnh ccknh thng.

BSS = BSC + sum(BTS) + lin kt

2 2 H thng trm gc


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2.2 H thng trm gc

BTS: thc hin cc chc nng giao tip vi

Ms qua knh v tuyn, c th nh sau: Thu v pht tn hiu v tuynnh x knh logic vo knh vt l M ha v gii m Mt m iu ch v gii iu ch


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2 2 H thng trm gc


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7

BTS

52

BTS

BTS4

BTSBTS 1

BSC 3

BTS

6

* Cu hnh kt ni cc BTS:Hnh sao: star -1,2,3

Hnh chui: chain -1,2,4,5

Mch vng: loop 1,2,4,6,7,3,1

* V tr ca BTS so vi BSC:BTS t gn: co-located BTS: 1BTS xa: remote BTS: 2 - 7

BTS

2.2 H thng trm gcCu hnh ca BSS

2 3 H thng chuyn mch


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2.3 H thng chuyn mch

Thc hin tt c cc ng dng cn thit

nh tuyn cuc gi n hoc t ngi sdng v cc mng in thoi khc nh PSTN,ISDN.

Bao gm cc thnh phn: MSC, HLR, VLR,AuC, EIR


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B nh v thng tr HLR: l c s d liu

cha cc thng tin lu di v thu bao Chc nng:

Cc s nhn dng thu bao IMSI, MSISDN

Thng tin v thu bao Cc dch v m thu bao hn ch s dng Cc dch v b sungVng phc v hin ti ca thu bao Kha nhn thc phc v cho qu trnh nhn thc

thu bao



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B nh v tm tr VLR: lu tr thng tin v thu

bao trong vng phc v gn lin vi MSC Khi thu bao i vo min qun l ca MSC n s

yu cu HLR chuyn thng tin v thu bao tiVLR

Chc nng: Lu cc s nhn dng: IMSI, MSISDN, TMSI, MSRN S nhn dng vng ang phc v MS (LAI)

Cc dch v MS c/hn ch s dng Trng thi ca MS (bn, ri)



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Trung tm nhn thc AuC L c s d liu lu tr kha nhn thc Ki ca

thu bao.

To ra b ba (RAND, Kc, SRES) khi c yu cu

t HLR Thng c xy dng kt hp vi HLR



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B nhn dng thit b EIR L c s d liu cha thng tin v tnh hp l ca thit b

di ng Mi thit b di ng c s nhn dng thit b IMEI Cc s IMEI trong EIR c chia ra lm 3 danh sch:

Danh sch trng (white list): l danh sch cc thit b di nghp l

Danh sch en (black list): l danh sc cc thit b di ng bnh cp

Danh sch xm (Grey list): l danh sc cc thit b di ng b lihay chu tha mn cc tiu chun ca h thng GSM hin ti

2 4 H thng vn hnh & bo dng


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2.4 H thng vn hnh & bo dng

OMS: thc hin chc nng qun l, vn hnh, bo

dng cho tt c cc phn t trong mng mt cchtp trung. OMS thng c mt s trung tm vn &bo dng

OMC

OMC kt ni vi BSS, SS thng qua mng truyn sliu

2 Cu trc mng GSM


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2. Cu trc mng GSM

3 Phn cp vng phc v GSM


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3. Phn cp vng phc v GSM1. Phn chia theo vng mng

2. Vng mng c phn chia theo vng phc v:MSC/VLR

3. Vng phc v c chia thnh vng nh v: LA

4. LA c chia thnh cc cellGhi ch:

- 1 LA bao gm mt s cell, cc cell c th khngthuc cng 1 BSC

- Thng bo tm kim MS c thc hin trong LA



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3. Phn cp vng phc v GSM



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3. Phn cp vng phc v GSM

Phn chia vng phc vMSC/VLR thnh cc LA

Phn chia mng thnh ccvng phc v MSC/VLR

Phn chia LA thnh cc cell

4 Di tn s v cc knh


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4. Di tn s v cc knh

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4 Di tn s v cc knh


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4. Di tn s v cc knh S dng hai di 25MHz

Uplink (MS to BTS) = 890 915MHz. Downlink (BTS to MS) = 935 960MHz

Mi di trn chia thnh cc knh c rng 200khz

Khong cch cp knh ln v xung: 45MHz

Do 125 cp knh tn s c s dng nhng thngthng 124 knh c dng v 1 knh cn li bo v.

Trong thc t, cc knh cnh nhau khng bao gi c sdng trong mt Cell

Mi knh tn s li c ghp theo TDM

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4 Di tn s v cc knh


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4. Di tn s v cc knh

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4 1 Knh vt l


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4.1 Knh vt l

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4 2 a truy nhp


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4.2 a truy nhp

GSM s dng kt hp FDMA v TDMA

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Tng s knhvt l trong

GSM900 l :

124*8 = 992.


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4 4 Cc knh logic


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4.4 Cc knh logic

Rt nhiu loi thng tin cn truyn gia BTS v MS,

chng hn nh s liu ngi s dng v bo hiu iukhin. Cc knh logic c sp xp trn cc knh vtl nht nh

Knh lu lng

Knh iu khin

Knh lu lng (TCH: Traffic CHennal): mang s liuting c m ho hoc s liu ca ngi s dng. L

knh ng ln v xung, im ni im. C hai dngknh TCH l knh lu lng thoi vi tc 13Kb/sv knh s liu 12 kb/s.

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4 4 Cc knh logic


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4.4 Cc knh logic

Knh iu khin: mang thng tin bo hiu v s

liu ng b n bao gm cc nhm knh: Knh qung b

Knh iu khin dng chung

Knh iu khin dng ring

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4 4 Cc knh logic


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4.4 Cc knh logic

Mt s knh qung b: Knh hiu chnh tn s (FCCH) mang thng

tin hiu chnh tn s ca MS. L knh ngxung, im ti a im.

Knh ng b (SCH): Pht thng tin ng bkhung ca MS v nhn dng BTS. Knhng xung, im ti a im.

Knh iu khin qung b (BCCH): phtthng tin chung trn c s mt knh cho mtBTS. Knh ng xung, im a im.

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4 4 Cc knh logic


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4.4 Cc knh logic

Knh iu khin chung bao gm:

Knh tm gi (PCH): Dng tm gi Ms. Knhng xung, im ni im.

Knh thm nhp ngu nhin (RACH): c MS yu

cu dnh mt SDCCH hoc tr li tm gi hoc thm nhp khi khi u hoc ng k cuc gi MS.Knh ng ln, im ti im.

Knh cho php thm nhp(AGCH): Knh ny c

s dng dnh mt SDCCH hay trc tip mt TCHcho MS. Knh ng xung, im ti im.

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4 4 Cc knh logic


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4.4 Cc knh logic

Knh iu khin ring bao gm:

Knh iu khin ring ng mt minh (SDCCH)c s dng bo hiu h thng khi thit lpmt cuc gi trc khin nh mt TCH. Chng hnng k v nhn thc thc hin y. Knh ng

ln/xung, im ti im. Knh iu khin lin kt chm (SACCH): Thng bo

v cng tn hiu thu c t hin thi v ln cn. Cc thng tin trn cn thit quyt nh

vic chuyn giao. Knh iu khin lin kt nhanh (FACCH): dng cho

mc ch chuyn giao (handover).

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5. S dng li tn s


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5. S dng li tn s

S dng li tn s l vic cp pht cng mtnhm tn s v tuyn ti cc v tr a l khcnhau trong mng m khng lm nh hng ncht lng kt ni ti giao din v tuyn do nhiu

ng knh v nhiu knh ln cn gy nn. Ti saophi s dng li tn s:

S knh tn s s dng t.

Mun tng dung lng h thng

5. S dng li tn s


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Trong mng GSM, mi trmBTS c cp pht mt nhmtn s v tuyn.

Cc trm thu pht gc BTS lncn c cp pht cc nhmknh v tuyn khng trng vicc knh ca BTS lin k.

5. S dng li tn s

5 S dng li tn s


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5. S dng li tn sCc cell cng tn ccung cpcng mt

nhm tn sv tuyn Mt cm cluster: gmN knh s dngcc

tn skhc nhau c lp litrong ton b

vng phsng.

Cluster

6. Mt s th tc


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MS bt my Cp nht v tr Cuc gi ti MS Cuc gi t MS Chuyn giao

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6. Mt s th tc

6 1 MS bt my


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6.1 MS bt my MS phi thc hin ng nhp ln u

thm nhp vo mng MS qut tm tn s ng knh FCCH Tm knh SCH nhn ng b thi gian,

nhn s khung TDMA v s nhn dng . Thc hin cp nht v tr bo cho VLR ph

trch v HLR bit v tr ca n. cp nht v tr MS nhn LAI t BCCH v

bo cho h thng bit.

6 1 MS bt my (tip)


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6.1 MS bt my (tip)VLR chp nhn cp nhn v tr n s nh

du tch cc v IMSI ca MS.VLR s bo cho HLR bit v v tr hin ti ca

MS.

HLR

MSCVLR

(2) Yu cucp nht vtr

(3) tipnhn v tr

(1) Yu cunht v tr

(4) Cng

nhn cpnht v tr

nh du tchcc IMSI

6 2 Cp nht v tr


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6.2 Cp nht v trXy ra: MS di chuyn t LA ny n LA ny

n LA khc.+ TH1: hai LA thuc cng MSC/VLR

- yu cu cp nht v tr ch gi ti

MSC/VLR + TH2: 2 LA thuc 2 MSC/VLR khc nhau.

6 2 Cp nht v tr (tip)


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6.2 Cp nht v tr (tip)TH2:

MSCHLR VLR

MSC

VLR

(5) xo v tr

(6) tip nhn xo

(2) Yu cu cp nhtv tr

(3) tip nhn v tr

(1) Yu cu nht v tr

(4) Cng nhn cp nhtv tr

MS

(C)

(Mi)

6 3 Cuc gi t MS


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6.3 Cuc gi t MS

6.3 Cuc gi t MS


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1. MS dng RACH yu cu knh bo hiu

2. BSC n nh knh bo hiu cho MS bng knh AGCH.3. MS yu cu thit lp cuc gi bng knh SDCCH ti MSC/VLR. Trn knh

SDCCH cha cc thng tin bo hiu ch cuc gi nh:

nh du MS ang tch cc VLR

Qu trnh nhn thc

Mt m

. Nhn dng thit b

. gi s thu bao b gi ti mng v kim tra xem thu bao b gi cb chnkhng

4. MSC/VLR yu cu BSC/TRC n nh knh TCH cn ri. RBS v MS cngchuyn ti knh TCH.

5. MSC/VLR gi s thu bao b gi ti tng i PSTN kt ni vi thu bao

6. nu thu bao b gi tr li th cuc gi c kt ni.

6.3 Cuc gi t MS

6.4 Cuc gi n MS

1 Q i


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6.4 Cuc gi n MS1. Quay s cn gi2. nh tuyn ti GMSC

3. Gi IMSI cho HLR v yu

cu MSRN4. Yu cu MSC/VLR phcv gn v gi MSRN cho MSn HLR

5a. MSC gi MSRN nHLR

5b. MSRN c gi tiGMSC

6. nh tuyn cuc gi tiMSC

7. Yu cu tm gi MS

8,9 Thng bo tm gi cqung b trong LA

10. Sau khi nhn tm gi, Msgi yu cu knh bo hiu,qu trnh nhn thc v mtm bt u. Tip n l qutrnh bo chung v kt ni.

Tng i niht

GMSC

MSC

BSC

HLR

VLR

(2) (3)

(4)

(5)(6a)

(6b)

(7)

(8)(8)

(9) (10) (9)

(1)

6.4 Cuc gi ti MS(tip)


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6.4 Cuc gi ti MS(tip) Thu bao A quay m ni nhntrong nc t tivng GSM/PLMN. Nithng c

thit lp t tng i ni ht cathu bao A nGMSC ca mngGSM/PLMN.

- Thu bao A quay s cathu bao B, sthu bao cphn tch GMSC. Bngchc nng hi pGMSC giMSISDN cng viyu cu v s lu ng(MSRN) n bghinh v thngtr (HLR)

- HLRdch sthu bao caMS cquay vo nhn dngGSM/PLMN: MSISDN IMSI

- HLRchcho MS vng phc v v giIMSI caMS nVLRcavng phc v

ng thiyu cu vMSRN. - VLRs tm thign s lu ngMSRN cho thu bao b giv gin ngc tr v

HLR, HLRs gin v tng i cngGSMC. - Khi nhn cMSRN ng tng iGMSC sc kh nng thit lp cuc gi n

vng phc vMSC/VLRnithu bao B hin angc mt. - VLRs chcho thu bao ny vng nh v(LAI) giai onqu trnh thit lp cuc

gi h thng mun rngthng bo tm githu bao b gi cpht qungb trn vngphsng ca tt ccc cavng nh vny. V vyMSC/VLRgithng bo tm gi ntt ccc BTS trong vng nh v.

- Khi nhn cthng tin tm gi,BTS spht n ln ngv tuyn knh tmgiPCH. Khi MS trngthi rivnghe knh PCH ca mttrong scc thucvngnh vLA, n s nhnthng tin tm gi, nhn bit dngIMSI v gi tr li vthng botm gi.

- Sau cc th tc v thit lp cuc giv sau khi gn cho mtknh thng tin

6.5 Chuyn giao


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6.5 Chuyn giao

MSC MSC

BSC BSCBSC

BTS BTS BTSBTS

MS MS MS MS

12 3 4

C 4 trng hp chuyn giao

+ chuyn giao trong mt

+ chuyn giao hai thuc cng BSC

+ chuyn giao 2 thuc 2 BSC khc nhau

+chuyn giao hai thuc 2 MSC khc nhau.79

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6 5 C uy g ao (t p)

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y g ( p)1. BSC da vo kt qu o gi yu

cu chuyn giao v s nhn dng mi n MSC.

2. MSC gi yu cu n BTS ny.

3. BSC lnh cho BTS tch cc knhTCH ri4.BTS tch cc knh n gi thng

tin v khe thi gian v tn s tiMSC.

5.MSC gi thng tin ny n BSC c.6. MS c lnh chuyn ti knh mi

7. MS gi cm truy nhp chuyn giao TCH mi.8. BTS gi nh thi gian v cng sut

ti MS.9. BSC mi nhn uc thng bo rng

BTS nhn c cm truy nhpchuyn giao.

10. BSC gi thng tin ny n BSC cqua MSC.

11. MSC gi thng tin ny n BSC12. BTS c gii phng knh TCH v

SACCH c.

81

Chuyn giao 2 thuc 2BSC

GSM: chuyn giao 2 thuc 2


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1. BSC gi yu cu chuyn giao n MSC.2. MSC yu cu MSC ch gip .3. Yu cu chuyn giao c gi ti BSC

mi.4. BSC yu cu BTS tch cc knh TCHri.5. MSC nhn c thng tin v knh ny.6. chuyn thng tin ny v MSC c cngvi s chuyn giao.

7. ng truyn c thit lp ti MSCmi8. lnh chuyn giao s c gi ti MScng vi thng tin v tn s v khe thigian s c s dng ti mi.9. MS pht cm chuyn giao mi10. BSC v MSC mi nhn c thngbo yu cu chuyn giao11. BSC v MSC mi nhn c thng

bo hon thnh chuyn giao.

GSM: chuyn giao 2 thuc 2MSC

7. Nhn thc v mt m GSM


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chuong5_phan2

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