OWG000~1
Transcript of OWG000~1
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HUAWEI TECHNOLOGIES CO., LTD.
www.huawei.com
HUAWEI Confidential
Security Level:
OWG000016 WCDMA-CSbasic conception, principle
and basic call flow
introductionISSUE 2.0
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Upon completion this course, you will be able to :
Master the basic conception of signaling andtrunk network
Master the protocol function listed in the slideMaster the conception of mobility
communication
Master the basic call flow
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Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
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Chapter 1 basic conception of signaling network
1.1 Whats signaling
1.2 signaling network
1.3 basic conception of signaling network
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Whats signaling
Signaling is the control signal transferred betweencommunication devices( include user termination,switch devices, etc).
In the communication network, except the signalused to transfer services information, there isinformation transferred in the network , and suchinformation is not for voice, images or charactersabout services, but the control signal betweencommunication devices, such as occupancy,release, the busy or free state of devices, thecalled number, etc. that all are control signals
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Signaling classification-by signaling transfer mode
CAS (Channel Associated Signaling ):
Channel Associated Signaling is in-band signaling inwhich user call data and signaling are combined.
CCS (Common Channel Signaling ):
Common Channel Signaling is a signalingsystem used in telephone networks thatseparates signaling information from userdata. Usually TS16 (Timeslot 16) on a E1
interface and TS1 (Timeslot 1) on a T1interface, are exclusively designated to carrysignaling relating to other traffic channels.
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Channel Associated Signaling
Switch network Switch network
Signaling device Signaling deviceCommon control Common control
Switch A Switch Btrunk
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Common Channel Signaling
Switch network Switch network
Signaling deviceSignaling device
Common controlCommon control
Switch A Switch Btrunk
Data link
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Chapter 1 basic conception of signaling network
1.1 Whats signaling
1.2 signaling network
1.3 basic conception of signaling network
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Signaling network
No.7 signaling network is a specific network which is used to transfer the No.7signaling
It is composed of SP, STP and signaling link
Signaling network is a independent network form telephone network, in china theNo7 signaling network has 3 layers
HSTP
LSTP
SP
Between two SP (SP or STP) there is a signaling link
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The dual plane structure of signaling network
AHSTP
HSTPHSTP
HSTP
HSTPHSTP
SP
LSTP
LSTP
SP
SP
LSTP
LSTP
LSTP
LSTP
SP
SP
SP
B
A
B D
A
CB
DA
C
D
F
E
C
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Chapter 1 basic conception of signaling network
1.1 Whats signaling
1.2 signaling network
1.3 basic conception of signaling network
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SP and STP
SP: SP is a node of signaling network to send orreceive the signaling message, and is a initiation
or destination of the signaling message
OPC: it is a signaling point to generate the
signaling message
DPC: it is a signaling destination
STP: if some signaling point is neither OPC nor
DPC, its function is only to transfer the signaling
message from one signaling link to another
signaling link, this SP is STP
SP SP
STP
OPC DPC
STP
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Signaling point
24-bit signaling point combination
14-bit signaling point combination
SLSDPC
CIC
8 4
OPC
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Signaling link and signaling link set Signaling link:
signaling link is between 2 signaling points, and there are at most 16
signaling links between 2 signaling points which are connected to
each other directly; If there more than 16 signaling links between 2
directly connected signaling points, the local or the peer end should
add new signaling point
Signaling link set:Signaling link set is a group of signaling links which have same
property, and these signaling links are between 2 adjacent signaling
points
SPa
Link set
Link 0
Link 1 SPbLink n
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(SLC) Signaling link code and link number
SLC is the number of signaling link, SLC is unique between 2
adjacent signaling point, SLC has 4 bits, so SLC is from 0-15
Link number is a number to distinguish the link in local office, it
is unique in local office
SPa
Link set
Link 0
Link 1
SPb
Link n
Link 2
Link 3
Link n
slc0slc1slc2
SPcLink 2
Link 3
Link n slc0slc1
slc2 Link 0
Link 1Link n
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Direct connection and similar direct connection
Direct connection
Similar direct connection
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SLS and SLSM
SLS: SLS has 4 bits (000F), is used to select signaling link forNo.7
SLS is circularly changed, in order to grantee the symmetrical
burden of each link or link set
SLSMsignaling link (link set) selection mask, it is indicated by a 4 bitcode
backupCIC
SLS
OPC DPC
4 8 4 24 24
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Signaling link (set) selection setting principle
Setting principle , suppose there are 4 link or link set:
SLS 1 1 0 1
SLSM 1 0 1 0
These bits will be ignored
This bit acts as lowest bit
This bit acts as lower bit
1 0
0 0 1 0%4
2
Add 0 in the high bits to constitutes the 0010=0x2
The signaling link number which have the same priority
result
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Signaling route
Signaling route is a logical conception which is used to indicate a
path the signaling message go through from OPC to DPC
SPA SPB SPCLink set AB
Link set ABSignaling RT AB
Signaling RTAC1Link set AB
SPBLink set AB
Signaling RT AC2Link set AB
Link set ABSignaling RT AB
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Questions
What is CAS, CCS, and No.7 is owned to which type ?
What is the difference of signaling link number and SLC, how manysignaling links can be configured between 2 signaling points, why?
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Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
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Trunk network
A area B areaB area A area
trunk
TMSC1
TMSC2
VMSC VMSC
TMSC2
VMSC VMSC
TMSC1
TMSC2
VMSC VMSC
TMSC2
VMSC VMSC
A province B province
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Relationship between signaling network and trunk network
trunkSignaling link
TMSC1
TMSC2
VMSC
HSTP
LSTP
SP(TM)
HSTP
LSTP
SP(TM)
SP(INTS)
TMSC1
TMSC2
VMSC
A province B province
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Office direction
There is a office direction if there is direct trunk connection between 2 switch
Attention: G9 has office direction to the direct connected office, but just
MSOFTX3000 has office direction, UMG8900 has no office direction
MSC
GMSCSCP
RNC
HLR
SMC
BSC
MSC2
0
23
1
TMSC2-A
TMSC2-B
VMSC-A VMSC-B
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SRT and RT
SRT
If there is a direct voice channel between two offices, it is taken that thereis a sub-route between them
RT
For an office direction, the set of all sub-routes to it is called a route, Oneroute may contain multiple sub-routes, and different routes may contain the
same sub-routes
A B
C
D
SRT 1
SRT 2
SRT 3
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Trunk circuit and trunk group
Trunk circuit:
The trunk circuit is the component constituting a trunk group, and one
trunk circuit corresponds to one timeslot in E1 line
Trunk group
The trunk group is the component building a sub-route, and it is a setof trunk circuits with the same properties. It can be composed of one ormultiple PCM systems.
The trunk circuits to the same office direction are grouped into one trunkgroup
The SS7 trunk group is generally bi-directional, and used to carryoutgoing or incoming traffic.
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CIC (Circuit Identification Code)
The CIC is used to identify a circuit between two SPs. CIC fields only existin the TUP and ISUP messages of circuit switched services. Because a CICfield is 12 bits long, there can be 4096 circuits between two SPs inmaximum
CIC E1#1 E1#0 CICTS0 0000000 00000TS1 0000000 00001
TS31 0000000 111110000001 11111 TS31
7 bits 5 bits CIC
PCM system number PCM timeslot number
0000001 00000 TS00000001 00001 TS1
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CIC number principle
......
......
CIC=0,CIC=1,
CIC=m1
CIC=0,CIC=1,
CIC=m2
SLC=0,SLC=1,
SLC=n1
SLC=0,SLC=1,
SLC=n2
SPoffice direction 1 office direction 2
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Questions
Whats office direction, if MSOFTX3000/UMG8900 has the conception of office direction ?
Whats the difference and relationship between RT and SRT ?
In which range CIC is unique, and how many CIC can be configured between 2 signalingpoints ?
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Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
Corresponding Relations of SS7 with OSI Seven-layer
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INAP OMAP MAP
TCAP
SCCP
ISUP TUP
MTP(2
)
MTP(1
)
MTP(3
)
MT
P
Message Transfer
Part
OSI 7 layer model
Application Layer
Presentation layer
Session Layer
Transfer Layer
Signaling network layer
(Network layer)
Signaling Link Layer
( Data Link Layer)
Signaling data link layer ( physical Layer)
HLR VLR
Architecture
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MTP123 protocol
MTP3 implement the functions of the network layer of the OSIreference model, and is used to enable management messagetransmission between the signaling points for the purpose ofensuring a reliable transfer of the signaling messages over thesignaling network in case that signaling links and signalingtransfer points fail
It is used to transfer signaling to a data link. The level 2 functions
together with a level 1 signaling data link provide a signaling linkfor reliable signaling transfer between two directly associatedsignaling points; MTP2 can provide signal unit delimitation, signalunit alignment, error detection, error correction, initial alignment,processor outage, level 2 flow control and signaling link errormonitoring
It is equivalent to the physical layer of the OSI reference modeland is used to generate and receive the signals through thephysical channels. It defines the physical, electrical and functionalcharacteristics of a signaling data link and the means to access it.
Signaling data link (MTP-1)
Signaling link functions(MTP-2)
Signaling network functions(MTP-3)
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ISUP and TUP
ISUP (ISDN User Part ):It defines the signaling messages, functions and proceduresrequired to control voice and non-voice services (for example,circuit switched data communication). The ISUP can not only
implement the functions of the Telephone User Part (TUP) and the
Data User Part (DUP), but also achieve the ISDN services on awide basis, thus having a spacious application scope
TUP (Telephone User Part )
The TUP function is similar to ISUP, but can not support data typeapplications
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SCCP protocol
SCCP protocol (Signaling Connection Control Part ):SCCP is one of the user parts in the hierarchical architecture of theSignaling System No. 7, and resident at the functional level 4.
The SCCP provides additional functions to the Message Transfer Part(MTP) to cater for both connectionless as well as connection-orientednetwork services to transfer circuit related and non-circuit related signalinginformation and other types of information between exchanges andspecialized centers in telecommunication networks through a SS7 network
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MAP protocol
MAP protocol (Mobile Application Part ):
MAP defines how information is exchanged between mobilesystem communication network entities for the purpose ofachieving Mobile Station (MS) roaming function .
MAP can support location update, authentication, encryption,
hand over functions for MS
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CAP protocol
CAP (CAMEL Application Part ):CAP is from INAP, and it is used for the IN services
CAP enables signaling interworking between GSM Service SwitchingFunction (gsmSSF), GSM Specialized Resource Function (gsmSRF) andGSM Service Control Function (gsmSCF) of radio IN functional entities, for
the purpose of supporting CAMEL services
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Questions
Whats the function of MTP123 ?
Whats the function of SCCPTUP/ISUPMAPCAP protocol ?
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Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
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GSM area defination
Cell areaMSC area
Location area
PLMN
PLMN
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WCDMA area defination
Cell area
Service areaMSC area
Location area
PLMN
PLMN
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IMSI number
MCC MNC MSIN
3 digits 2/3 digits
Not more than 15 digits
IMSI (International Mobile Subscriber Identity)
NMSI
MCC
Mobile Country CodeMNCMobile Network CodeMSINMobile Station Identification NumberNMSINational Mobile Station Identity
IMSI number
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IMSI number :
IMSI: International Mobile Subscriber Identity
IMSI number is a unique identifier allocated to each mobilesubscriber in a GSM and UMTS network
Its code type is E.212
IMSI can be saved in SIM card, HLR and VLR, and betransferred through MAP interface and wireless interface
IMSI has at most 15 digits(0-9), such as 460002289000168
TMSI number
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TMSI number :
TMSI: Temporary Mobile Subscriber Identity
In order to ensure subscriber identity confidentiality the VLR (VisitorLocation Register) and SGSN (Serving GPRS Support Node) may allocate
TMSI to visiting mobile subscribers
IMEI b
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IMEI number
TAC FAC spare
6 digits 2 digits
15 digits
IMEI (International Mobile Equipment Identity)
TACType Approval CodeFACFinal Assembly CodeSNRSerial Numbersparestandby bit
Example:490547403767335
SNR
6 digits 1 digits
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MSISDN number
CC NDC SN
National ( Significant ) Mobile Number
MSISDNMobile Station International ISDN number
CC Country Code, China country code is86NDCNational Destination CodeSN Subscriber Number
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MSISDN number
MSISDN number :
Mobile Station International ISDN Number
The MSISDN Number is the standard international telephone number
used to identify a given subscriber
Its code type is E.164
MSISDN number can be saved in HLR and VLR, and can be
transferred in MAP interface
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Device number
CC NDC LSP
MSC Number
CC NDC
HLR Number
MSC number
HLR number
H0H1 H2 H3 0000
LSP (locally significant part)
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MSC/VLR Number and HLR Number
MSC/VLR number :
Its code type is E.164
HLR number
Its code type is E.164
Its structure is CC+NDC+H0H1H2H3+0000
MSRN/HON
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MSRN/HON
MSRN/HON number :
They are used to address the target MSC
They are generated by VLR temporary, when a MS act as a called party,
or the MS is being in the handover procedure
LAI
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LAI
Location Area Identity
MCC MNC LAC
MCCMobile Country Code
MNCMobile Network Code
LAC: Location Area Code
LAC:A Location Area is a number of cells (defined by the mobile
operator) throughout which a GSM / UMTS mobile will be paged LAI: Location Area Identity
SAI
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SAI
Service Area Identity
MCC MNC LAC SAC
MCCMobile Country Code
MNCMobile Network Code
LAC: Location Area Code
SAC: Service Area Code
SA: Service area
A Service Area consists of one or more cells within a givenLA (Location Area) and may be used to assist in the delivery oflocation based services
SAI: Service Area Identity
CGI
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Cell Global Identity
MCC MNC LAC CI
CGI: Cell Global Identity
MCCMobile Country Code
MNCMobile Network Code
LAC: Location Area Code
CI: Cell Identifier
Questions
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Questions
Whats the relationship of PLMN, LA, MSC, Cell, SA ? Whats the composition of IMSI, MSISDN, MSC/VLR number, HLR
number, MSRN/HON, LAISAIGCI ?
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Chapter 1 basic conception of signaling network
Chapter 2 basic conception of trunk network
Chapter 3 SS7 basic protocol introduction
Chapter 4 mobility communication basic
conception introduction
Chapter 5 basic call flow introduction
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Chapter 3 WCDMA basic call flow
3.1 normal location update flow
3.2 call flow between 2 MSC
Location update conceptionHLR t MSC/VLR N
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UE/USIM: store LAI, and detect the new LAI
SS7
HLR: store MSC/VLR No.
VLR/MSC: store LAI VLR/MSC:store LAI
LAI1LAI2
Normal location update
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Normal location updateMS BSS MSC VLR HLR/AUC
Locating updating
request(IMSI)
Um BSSAP MAP MAP
A B D
Locating updating requestUpdate location area
(IMSI)Send parameters(IMSI)
Authentication parameters
(RAND/SRES/Kc,IMSI)AuthenticateAuthentication request
Authentication response Authentication response Update location
Inserte subscriber data
Subscriber data insertion ack.
cancel location
cancel locationack.
PVLR
Update location ack.
(HLR?)Set cyphering mode
Forward new TMSI
Update location area ack.
CYPHER MODE COMMANDCYPHER MODE COMPLETE
Location updating accepteTMSI reallocation complete TMSI acknowledge
CLEAR COMMAND
CLEAR COMPLETE
imsi/tmsi,old lai,current
lai/gci
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Chapter 3 WCDMA basic call flow
3.1 normal location update flow
3.2 call flow between 2 MSC
Call flow between MSCs
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SS7
HLR
VLR/MSC1
LAI1LAI2
MS Call Another MS in same MSC
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MS Call Another MS in same MSCUm A B D
A Um
MSa BSSa MSC VLR HLR
BSSb MSbchannel requestRACH
SDCCH CM service request
(CKSN,IMSI/TMSI)CM service req.)
CM service req.) Send parameters(IMSI/TMSI)
Authentication para.
(IMSI,RAND/SRES/Kc)Authenticate(RAND,CKSNn)
Authentication request(RAND,CKSNn)
Authentication response(SRES)Authen. res.(SRES)
Set cyphering mode
Access req. accepted(IMSI/MSISDN)
CM service accept
CIPHER MODE COMMAND(Kc)CIPHER MODE COMPLETE
Setup ( MSISDN)Send info. for o/g call setup
Complete CallCall proceeding
ASSIGNMENT REQUEST
ASSIGNMENT COMPLETESend routing info req. (MSISDN, supplyment service info )
Provide roaming number req(IMSI)
Provide roaming number Ind
Send Routing infomation acknowledge
send info.for i/c call setup
page MS(LAI)
PAGING(LAI,IMSI)
Page responsePage response(LAI,GCI)
MS Call Another MS in same MSC
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MS Call Another MS in same MSCUm A B D
A Um
MSa BSSa MSC VLR HLR
BSSb MSb
Process access req. Send para.(IMSI/TMSI)
Authen. para.
(IMSI,RAND/SRES/Kc)Authenticate
(RAND,CKSNn)
Authentication request(RAND,CKSNn)
Authentication(SRES)
Authentication response(SRES)
Set cyphering modeAccess request accepted
Complete callCIPHER MODE COMMAND(Kc)
CIPHER MODE COMPLETE
Setupcalling MSISDN
Call confirmed
ASSIGNMENT REQUEST
ASSIGNMENT COMPLETE
Alerting
Connect
Connect acknowledge
Alerting
Connect
Connect acknowledge
MS Call Another MS in same MSC
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MS Call Another MS in same MSCUm A B D
A Um
MSa BSSa MSC VLR HLR
BSSb MSbDisconnect
Disconnect
Release
Release
Release completeRelease complete
CLEAR COMMMAND
CLEAR COMPLETE
CLEAR COMMAND
CLEAR COMPLETE
DisconnectDisconnect
Release
Release complete
CLEAR COMMAND
LEAR COMPLETE
Release
Release complete
CLEAR COMMAND
CLEAR COMPLETE
Questions
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HUAWEI TECHNOLOGIES CO., LTD.HUAWEI Confidential
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Questions
Whats the function of MSRN ?
Please describe a normal location update and call flow
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Thank you!
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