UMTS MẠNG LÕI.docx

5/19/2018 UMTS MA NG LI.docx

1/19

1. ISUP/BICC thit lp cuc gi

Giao thc BICC ( Bearer Idependent Call Controll :Giao thc bo hiu c lpknh mang) c xy dng trn giao thc bo hiu s7 phn ISUP tng thchhon ton vi cc dich vhin c trn mng PSTN/IDNS. Gia BICC v ISUP c

nhiu bn tin bo hiu c tn tng tnhau, nhng chng khng tng thch peer-to-peer. Skhc bit l ISUP chc thgn cc khe thi gian ca hthng PCM-30 hoc PCM-24 c tc truyn dliu cnh ( 64 hoc 56 kbps) cho cc knhlu lng, trong khi BICC c thcung cp v kim sot bt k QoS cn thit chomt kt ni end-to-end. Cc dch vc thcung cp cho thu bao 3G vi sra ica mng li CS Rel.4 phm vi kin trc tn gin n sp p i ng rng a

phng tin thi gian thc


2/19

1.1Thng sa chcho bn tin ISUP/BICCt nht hai giao thc cung cp dch vgiao vn cho ISUP v bn tin BICC: SS#7Message Transfer Part ( phn chuyn giao ca bn tin SS#7 (MTP)) v MTP Layer3 User Adaptation Layer( lp 3 lp giao tip ngi dng ( M3UA)). M3UA sdng dch vca giao thc SCTP (Stream Control Transmission Protocol : Giaothc iu khin lung truyn ti) v giao thc IP ( Internet Protocol).

Hnh 6.1 minh ha cc a chca MTP ng cho nh tuyn bn tin ISUP/BICC.Cc a chc tm thy trong ci gi l nhn inh tuyn. Mi trao i ca SS#7u c a chca ring mnh l m im bo hiu (SPC: Signaling Point Code).

Nhn nh tuyn l mt phn ca MPT lp 2 MSU ( Message Signaling Unit: nvbn tin bo hiu) nu lp vt l da trn nn tng hthng PCM-30 hoc PCM-24 hoc n l phn ca MTP3-B (Message Tranfer Part Level 3 broadband), nc sdng trong hthng giao vn ATM.Ngi gi bn tin MSU hoc MTP3-B gi l OPC ( Originating Point Coe) v ngi nhn l DPC ( Destination Point

Code). Thng sla chn lin kt bo hiu (SLS: Signaling Link Selection) a rada trn lin kt bo hiu SS#7 thuc mt b lin kt ( Signaling Link Set) cc tinnhn c gi.di ca SPC phthuc vo khu vc: chu u sdng m im 14-bit, nhtm 16-bit, v Bc Mv Trung Quc dng m 24-it i vi MTP3-B p dngcc tiu chun chu u.


3/19

i vi bo hiu MTP3, di SLS l 4 bit mng li chu u v 8 bit BcM i vi MTP3-B mt SLS 14 it c sdng trn ton thgii.i vi M3UA khng c SPCs ng cho a chMSC, nhng m l a chIP calp truyn ti IP c nh cc my chMSC.

1.2 ISUP call ( Succcessful)

cc lu lng cuc gi v dtrong hnh 6.2 cho thy vic trao i bn tin ISUPgia hai MSCs, n c kt ni vi nhau bng cch sdng im trao i tn hiu( STP: Signaling Transfer Point). Nhim vduy nht ca STP l nh tuyn ccbn tin bo hiu SS#7

N khng thit lp hoc khi to bt k cuc gi no. Tuy nhin, bi v n nm vtr trung tm trong mng STP l mt im kt ni rt tt cho cc c sdliu,n cho php mng cung cp cc dch vthng minh nh tnh i ng shoc trtrc cuc gi bng th.Trong cc mng thc ttrong cuc sng, nh mt qui lut mt cp STP kt htc ci t v l do dphng iu ny m bo tin cy cao ca mng v n

m bo khnng chi tit ca tin nhn linh hot thay i tuyn vn trong trnghp li n trn lin kt bo hiu SS#7.Mi Isup bt u thgi vi mt bn tin a chkhi u (IAM: Initial AddressMessage) c cha nhm sngi gi n ca ngi dng khi u v nhm sngi gi n.a chton btin nhn (ACM: Address Complete Message) chra rng SPC-B


4/19

t c tt cthng tin trao i cn thit chm dt cuc gi.Khng c quay sthm thng tin c thc gi bng bn A sau khi nhn c tin nhn nyCc tin nhn trli (ANM:) chra rng bn B by gic kt ni v cc cuc gic kch hot cho n khi mt trong hai A hoc bn B khi to tin nhn nhn

c cuc gi. Thng bo ny gm mt gi trcho bit nguyn nhn v dnh nnhn bn tin REL xc nhn cuc gi vi bn tin hon thnh khi to (RLC)

1.3 ISUP Call ( Unsuccessful)

i vi thtc thit lp cuc gi khng thnh cng, cuc gi btchi bi SPC-Bngay lp tc gi mt thng bo Rel bao gm cgi trnguyn nhn m chra l doti sao cc cuc gi c thkhng c hon thnh, v uh ( n B) Ngi dngbn (Hnh 63)

Khi cuc gi khng thc hin c, cc nguyn nhn gi vvn c a ra.Tht khng may, nhng nguyn nhn khng phi lc no cng ni ln ton svic. Trong nhiu trng hp cc svic khc nhau c thgy ra cc nguyn nhntng t. Nhng iu phc tp hn na cc nh sn xut khc nhau c thgy racc gi trnguyn nhn cho nhng l o khc nhau c bit tn ti mt sb


5/19

SS#7 cho php cu hnh min ph cc gi trnguyn nhn trong trng hp sai st.Hnh 6.4 cho thy rng thtc cuc gi ISUP gia hai im tn hiu SS#7 linquan n cng mt knh giao vn, c dnh du bi cc qui lut cng CIC (Circuit Ientification Coe: M nh danh mch) u tin l mt thtc cuc gi

thnh cng, trong n B l mt trong nhng in thoi tng tv cc cuc giang tm ngng ( n tin SUS) trc khi n c khi to. Trong ln gi thth2, cuc gi khng thnh cng do mt sl do khng r rng.Hnh 6.5 cho thy cc nguyn nhn khi to cuc gi khc nhau N thng rtkh phn bit, c thphn loi cc gi trnguyn nhn l tt hoc xu.

Normal call clearing, normal-unspeccified, user busy, and user not repongding

biu thcho cc chng ca mng.No circuit available chra l khng c khethi gian cho knh lu lng c sn, cng l mt chng tquan im kthut l mt cu hi vhoch nh ti nguyn trong mng nuTrong cc phng php phn it tng tnhau, no router destinationphi c


6/19

nhc n. Gi trnguyn nhn ny c thchra cc hng dn sai ca mt cucgi do li logic mt trong nhng nh tuyn sai ca mng trong bng hoc c sdliu dch tiu ton cu (GTT: Global Title Translation). Mt khc, gi trnguynnhn tng tcng l trli nu bn gi l anh sch en, c ngha l cc thu ao

bn A bcm, v dh khng thanh ton mt ha nDestination out of order cho thy vn vphn cng hoc phn mm ca SS#7trong thit bchuyn mch trn ng tA n B.Cui cng, mttemporary failure(tht bi tm thi) lun l phc tp. Thng

thng, n l kt qutrli ca mt IAM c gi vi mng khng c ACM hocban r tin REL. Cc Tiambm thi gian hng dn cc cuc gi i hi mtcu trli cho IAM trong mt gi trthi gian v d10s y l mt nguyn nhnc phm vi rng ti sao ANM c thbl:

-Cc IAM nh tuyn sai v gi n SS#7 im tn hiu sai: im tn hiu sloi bccIAM m khng trli bt kdu hiu bo li-nh sng cng c thgy tht bo tm thi iu ny xy ra khi cc im tn hiu cgng thcc knh lu lng (tc l cng CIC) cng mt lc. Mt cch thc gii quytvn l khng cho php cc nhm trc chnh hai chiu c c nh trong cc bngnh tuyn. Mt triu chng gip xc dnh chi l tht bi tm thi xut hin nu gitrl CIC l lhoc chn.

6.1.4 BICC Call setup on E Interface Including IuCS Signaling

V dtrong hnh 66 c da trn mt phin bn ca BICC sdng dch vvn chuynMTP trao i bn tin bo hiu trn cc lin kt ATM. Cc dch vmng kim sot biBICC l thoi qua ATM sdng AAL2 SVC ( Switched kt ni o) trn E interface a ra mt ci nhn tng quan ca mt nghin cu end-to-end hon chnh, thtc IuCS


7/19

cng c hin th.Cc ngn p giao thc trong v dtrn chai giao din c thhin trong hnh 6.6.Cc giao thc ngn p cu cu hnh trn E interface chc mt trong ba khnng tngng i vi ging ni ty thuc vo yu cu cht lng, c thsmt bm ha/gii

m nh AMR hoc G71 BICC cng c thchy qua IP hoc trn mt PCM-24/30 (DS-I/ E-1) ca lin kt bo hiu SS#7 nu ISUP n gin chl thay thbng BICC mkhng thay i mng li truyn ti.

6.1.41 Call Flow

Trong v dluu lng cuc gi ( xem hnh 6.7) mi nt mng c c nh bi SS#7SPC ca b, l mt phn ca nhn nh tuyn MTP. Cc thng bo trn giao din IuCSc thc lc bng cch sdng tham sSCCP SLR/DLR. Trn E interface ca tt ccc bn tin BICC c cng OPC = hoc c v DPC = c hoc trong nhn nh

tuyn ph hp cng vi cng mt gi trBICC CIC nu chng cng thuc mt cuc gi.u tin trao i bn tin NAS v RAB Assignment chy trn IuCS bao gm chc nngxc thc v an ninh ( hnh 6.8).Sau (nh trong hnh 69) sau khi thit lp RAB thnh cng BICC IAM c gi vEinterface hng ti GMSC Tuy nhin n cng c thl BICC gi mt ci gi l uIAM sdng mt thtc kim tra lin tc gili cho n khi hon thnh cuc githnh lp RAB hon tt kim tra chi tit trong chai trng hp, c ITU-TQ.1901, phlc 6.1 Successful Call SetupCc BICC IAM cha m gi c bit (CIC = 1), sl tng tcho tt ccc bn tin

BICC khc thuc cng mt cuc gi


8/19

Ngoi ra bn gi n bao gm, bn tin DMTAP SETUP c thl hi khc nhau, i v sbt u(0 hoc 00) c thbxa trong khi tham sa chc thay i squc giahoc squc t Thay i ny c thc chnh bi CldPty=g ( so vi SETUP CLDPty=g). Nu bn cht a chkhng r rng, tt cchsca cc tn hiu a chbn gi

c thhin khi hc cuc gi ca bn .

Skhu vc bao gm mt E164 a chcung cp thng tin c nh khu vc a l ( vdnh khu vc, quc gia thnh ph) vngun gc ca mt cuc gi.


9/19

a an u l a chIP ( chyu l Ipv6) ca MSC sgi cc IAM. N l cn thitgm c a ch, bi v tri ngc vi SS#7 da trn giao vn mng r rng cho MSC (vtl) ng dn n GMSC lin ktrong ATM hoc mng li chuyn vn trn nn IP,ton bMSCs/GMSCs c thkt ni n cng ATM hoc IP router v tt ccc lin kt

tn hiu hp l c thchy trn cc ng vt l nh nhauSau khi IAM nhn c, GMSC tra li bng cch gi bn tin APM thng bo trli nMSC. Thng bo ny cha cc thng schnh c thnh lp, dc bit l 1 ID bt bucnu c iu din bi mt AAL2 SVC.Tip nhn BICC APM gy ra thtc thit lp ALCAP. Mt ln na ID bt buc tBICCAPM c tm thy trong ALCAP. Yu cu ( ERQ) thng bo ti khon l c to ranhm phc vngi ng (SUGR) Con ngID v Knh ID sdn n skt hpa chVPI/VCI/CID c nh kt ni hp l cho trc chnh ( hnh 6.9)Cc thng bo tip tc phn nh hot ng ca bn thu bao A v B v c cng tn v

cng chc nng tng tnh ni n trong v dlu lng cuc gi ISUP.BICC REL gy ra khi to cRAB v khung chnh bng RANAP ( IuCS) v thtcALCAP ( hnh 6.10 v 6.11)


10/19

Giao din Gn xc nh kt ni gia cc nt htrGPRS (GPRS Support Nodes-

GSNs) khc nhau. Chng c thl nt htrGPRS phc v(Serving GPRS Nodes-

SGSNs) nu chng c mt kt ni ti UTRAN sdng giao din IuPS v/hoc kt

ni ti GERAN sdng giao din Gb, hoc nt htrGPRS Gateway (Gateway

GPRS Support Nodes-GGSNs) nu chng c mt kt ni ti mt mng dliu gi

(Packet Data Network-PDN, y l mng Internet cng cng) sdng giao din

Gi hoc ti mng PLMN khc (Public Land Mobile Network- mng di ng mt t

cng cng) sdng giao din Gp. Giao din Gn cng sdng kt ni tt ccc

SGSNs vi nhau.


11/19

Trong cgiao din Gp v Gn giao thc ng hm GPRS (GPRS Tunneling

Protocol-GTP) u c sdng. Mng giao vn pha di mt bng iu khin

l MTP (cho tin nhn bo hiu GTP-C) v mt bng ngi dng GTP (cho IP

payload)

c da trn IP chy trn Ethernet hoc lin kt ATM. cung cp mt dch v

giao vn nhanh gia cc thc thGTP ngang hng, giao thc UDP c sdng.

TCP vi mc tin cy cao hn UDP c nh ngha trong cc ti liu tiu chun

nhmt sthay th, nhng khng c sdng bi ngi iu hnh mng v

cc nh sn xut v n slm gim thng lng dliu trong min PS.


12/19

Nh trong hnh 6.13, mc ch chnh ca giao din Gn l ng gi v to ng

hm cho cc gi tin IP. To ng hm dliu ngha l dn dliu mt cch

thng sut qua mng li. Gia cc GSNs, mt ng hm GTP-U (GTP User Plane)c to cho mi ngcnh PDP ca mt ngi ng k{ GPRS. Qua ng hm

ny, tt ccc gi tin IP trong ng ln v ng xung c dn trc tip. Mt

tp cc tin nhn bo hiu GTP c sdng to, iu chnh v xo ng

hm. Nhng tin nhn GTP-C ny c trao i bng mt ng hm c lp gia

cc GSNs. Cc thng sca ng hm nhtc thng lng, c xc nh

trc tip tthothun vcht lng dch vQoS trong PDP context. V lp giao

vn IP mang cc gi tin dliu GTP, bao gm dliu mt bng ngi sdng IP

nn vic ng gi IP-trong-IP c thc theo di trn giao din Gn do a chca lp IP thp hn lp giao vn thuc SGSN v GGSN v chlin quan ti giao

din Gn. a chIP trong cc gi tin IP ng hm (c vn chuyn bi GTP T-

PDU) l a chIP ca ngi ng k{ GPRS v my chIP (IP Server).

Kin trc ca GTP gm c ba mt bng: mt bng iu khin (GTP-C); mt bng

ngi sdng (GTP-U) v GTP tnh cc.

Hnh 6.14 cho thy nhng chc nng ny c thtm thy gia nhng nt no

ca kin trc mng.


13/19

GTP-C qun l thit lp v gii phng cc ng hm ngi dng cthgia cc

GSNs trao i thng tin bo hiu GTP. Sau , n c sdng to, sa i

v xo cc ng hm mt bng ngi dng gia cc GSNs. Nhim vthba ca

GTP-C l htr, qun l{ di ng v qun l chnh vng tuzchn.

GTP-U c dng truyn ti cc gi tin IP n v i tmng chuyn mch gi

ging nhInternet. N c sdng trong cgiao din IuPS v giao din Gn. Tuy

nhin, cc ng hm trn giao din IuPS c iu khin bi bo hiu RANAP.

GTP c dng gia GSNs v chc nng cng tnh cc (CGF) truyn cc bn

tin chi tit cc.

3 c lm vic trn giao din Gs

Cc thit lp ca giao din Gs c sdng trao i dliu gia cc VLR v

SGSN c chc nng ng k Cch thc sdng giao din ny c thl mt yucu ti trang ca thu bao thc hin mt cuc gi thoi qua min PS hoc l yucu ti trang ca mt thit bi ng u cui sdng giao thc dliu gi PDPContext qua min CS.


14/19

Cc chng giao thc trn Gs vc n cng ging nh trn GSM,tuy nhin mt stin trnh nh BSSAP+ c nng cao.Tt ccc bn tin BSSAP+ c vnchuyn trn anh ngha ca SCCP.

Cc bn tin unitdata (UDT) sdng dch vvn ti phi kt ni SCCP. Cp nht vtr qua Gs

Trong tin trnh ny SGSN thng bo cho VLR vmt bn cp nht vtr vngchuyn mch CS

IMSI c sdng trong ton bcc thng o c nh cc thu bao duynht.Chsphn hcon SCCP Subsystem Number (SSN) trong dch vnythng c quyt nh bi cc nh khai thc vin thng,nhng trong mt s

trng hp SSN=192 c coi l gi trthc trong mng theo di. (hnh 6.19).

Chnh bc tch qua Gs

Cqu trnh bc tch IMSI v GPRS c thc chnh bng cch sdngbo hiu Gs,Trong v dtheo di cuc gi(hnh 6.20),mt tin trnh tch GPRS


15/19

c hin th. Thng tin nhn dng i km cho thy tin trnh tch ny l cadch vGPRS v n c yu cu bi mng.

Tm v gi qua Gs

Th dtrn hnh 6.21 vbo hiu Gs cho thy mt thng bo yu cu tm vgi c gi tVLR n SGSNNh vy ,y l mt thng bo tm v giCS gi qua min PS.Phn hi ph hp vi yu cu tm v gi ny c gnvo trong bn tin RANAP qua min IuCS


16/19

4.Bo hiu xl chuyn vng

Bo hiu xl chuyn vng cho UMTS gm hai kiu chnh: chuyn giao gia cc

MSC trong cng mng 3G v chuyn giao gia mng 2G-3G. Mc ny tp trung

vo cc ni dung lin quan ti bo hiu chuyn vng trong ni mng 3G. Nh

bit, giao thc ng dng di ng MAP khng chsdng cho truyn thng gia

cc c sdliu m cn iu hnh thng tin trao i gia cc MSC cng nhh

trchc nng truyn ti cho cc giao thc truy nhp mng v tuyn RAN lp 3

khc nhau. MAP c thmang cc bn tin RANAP c trao i gia cc RNC kt

ni ti cc MSC khc nhau. Khi RANAP htrmt phn chc nng truyn ti cho

giao thc RRC, cc bn tin RANAP mang thng tin RRC MSC trn giao din E

trong vng mng 3G, c nhng trong cc hot ng ca MAP. Cc RNC ca

cng mt UTRAN c thkt ni qua giao din Iur nhng khng c giao din Iurcho cc RNC khc UTRAN.

Hnh 6.27 chra hai UTRAN khc nhau kt ni qua giao din E ca vng CS v giao

din Gn ca vng PS. Nu c mt tnh hung chuyn vng ca mt UE thuc hai


17/19

UTRAN, CRNC ca cc ny cn thng tin ti cc CRNC khc m bo chuyn

giao khng gy li.

Vn trao i thng tin gia UE v mng c bt u bng vic thit lp mt

kt ni RRC. RNC1 iu khin kt ni RRC ny v kt cui trn cc giao din Iu

c gi l RNC phc v(SRNC). Nu UE di chuyn, n cn lin hvi mt ca

mt RNC khc. Hai RNC ny thuc cng mt UTRAN v kt ni vi nhau qua giao

din Iur. Nu hai hot ng trn cng tn sth chuyn giao mm c thdin

ra. Nu UE mt lin hvi cc c iu khin bi RNC ban u th chcn RNC

pha sau cung cp ti nguyn v tuyn cho kt ni. Tuy nhin nu UE tip tc di

chuyn khi cuc gi vn ang c hot ha th c thc mt ca mt Node B

khc cn tt hn. iu ny dn ti vic chuyn giao cng gia RNC th2 v RNC

mi th3 ny. Trong trng hp chuyn vng cng cc tham sca kt ni RRC


18/19

c chuyn tip n SRNC mi v kt ni gia cc RNC c thc hin thng

qua giao din E ca min li CS. Cc bc xl chuyn vng ni mng 3G c

tm tt theo cc bc sau:

Bc 1: Thtc chuyn giao ni 3G-MSC c khi pht bi bo co o RRC khi

mt thit bmi hot ng cng tn svi mt thit bc. (hnh 6.32).

Bc 2: Khi SRNC (RNC 1) nhn c bn tin bo co RRC, quyt nh thc hin

chuyn giao sang RNC 2. Khi khng tn ti giao thc Iur gia cc RNC, thtc

chuyn giao buc phi l chuyn giao cng cng vi ti chnh li SRNS ti cngthi im. Tin trnh ny c xl bi SRNC c, l thnh phn gi bn tin yu

cu ti nh vRANAP ti MSC ca n.

Bc 3: Da trn bng nh tuyn ca MSC phc v, RNC 2 c xc nh c kt

ni ti mt MSC khc nh trn hnh 6.32. V vy, MSC cn gi bn tin yu cu ti


19/19

nh vRANAP ti MSC khc ti RNC 2. Do knh lu lng ca cuc gi cn

chuyn ti MSC mi, MSC phc vgi bn tin chun bchuyn vng MAP cha

RANAP ti MSC mi.

Bc 4: MSC mi chuyn bn tin yu cu ti nh vRANAP ti RNC 2.

Bc 5: RNC 2 chnh tt ccc ngun ti nguyn v tuyn chun bcho kt

ni UE. c bit, cc chc nng lp lch v iu khin qun trc kim tra v

tnh ton tng thch vi cc tp tham sca RNC 1. Ty thuc vo kt qutnh

ton m chuyn giao c c thc hin hay khng qua bn tin RRC c gi i t

RNC 2. Nu yu cu QoS thay i, bn tin ti cu hnh knh mang v tuyn c

gi i, trn v dcho thy bn tin ti cu hnh knh vt l{ c gi.

Bc 6: RNC 2 gi bn tin xc nhn ti nh vRANAP ti RNC 2 p li bn tinti cu hnh knh vt l RRC.

Bc 7: Trli bn tin tin chuyn giao MAP c gi bi MSC mi ti MSC phc

vc. Bn tin ny cha xc nhn ti nh vRANAP gm thng tin ti cu hnh

knh vt l RRC.

Bc 8: MSC c gi lnh ti nh vRANAP ti RNC 1. Khi bn tin ti cu hnh

knh vt l{ c a ra bi RNC 2 nhng trong bn tin ny mt ln na. bn tin

lnh ti nh vra lnh cho RNC 1 kt thc cc lut hin p dng cho kt ni.

Bc 9: Bn tin ti cu hnh knh vt l{ c chuyn bi RNC 2 qua Iub c v giao

din Uu ti UE.

Bc 10: Da trn cc thng tin thu c tbn tin yu cu ti cu hnh knh vt

l RRC, chuyn giao c thc hin v bn tin hon tt ti cu hnh knh vt l

c gi i trn giao din Iub mi ti RNC 2.

Documents

UMTS MẠNG LÕI.docx