Download - Signalling 9
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Network
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. . 7 SS . Tone or Pulse Voice Mailbox Call-waiting Tone Multi-party SMS : :
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003-3400Hz . .
Call !Im busy
Voice Trunk
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Switch AUser Traffic User Traffic
Signaling Traffic Signaling Traffic
Switch B
Switch AUser & Signaling Traffic User & Signaling Traffic
Switch B ) ( Call Setup 51 02 3 5 ) (IN ) (
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7SS 07 7 SS 5791 7 SS ITU 0891 7 SS 4891 )(Red Book Update 7 SS ITU
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7SS007.SS7 Protocols (Q (series Out-of-band ) (ISDN
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Set up and clear down a call Provide Caller ID Circuit continuity check Notification to reset a faulty circuit Indication of national, international or other subscriber Nature of circuit (satellite/terrestrial)
Call forwarding Security access calls (CUG) Call holding Charging information Indication that a called party line is free Subscriber busy signal
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Service Switching Point 1- Signaling Transfer Point 2- Service Control Point 3-
(SP)
(56Kbps or 64Kbps)
SCP SCP STP SSP STP STP STP
SCP SCP SSP SSP STP SCP
SSP
SSP
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ISDN ...
TE
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STP)(STP )(LE,TE
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Network Identifier Cluster Identifier Cluster Member
SPC
Cluster=11
Network=246STP STP
Cluster=21
2
2
3
STP
STP
3
4
4
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)User Part (UP
)Message Transfer Part (MTP OSI
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MTP1OSI Physical Layer )E-1(32*64Kbps )DS-1(24*64Kbps )V35(64Kbps )DS-0(64Kbps )DS-0A(56Kbps
Digital Signal DestinationDS0 DS1 DS1C DS2 DS3 DS3
Bandwidth64 kbps 1.544 mbps 3.152 mbps 6.312 mbps 44.736 mbps 274.176 mbps
1 channel 24 channels 48 channels 96 channels 672 channels 4032 channels
Channels (DS0s)
Carrier DesignationNone T-1 T-1c T-2 T-3 T-4
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3MTP 2MTP 1MTP M T P
2MTP
) (Data Link OSI ) (Signaling Unit )(SU 8 )01111110( .
)(Flow Control )(Sequence Validation
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FISU 57 LSSU MSU FISU ACK MSU LSSU
MTP 2 MTP
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()Flag (F 01111110)
)Backward Sequence Number (BSN .
)Backward Indicator Bit (BIB .
)Forward Sequence Number (FSN ) 0 721( . )Forward Indicator Bit (FIB . )Length Indicator (LI FCS LI
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)Signaling Information Field (SIF MSU MTP )(Routing Label )Destination point Code (DPC )Origination point Code (OPC )Signaling Link Selector (SLS 2 MTP SLS : Overload ) (Share
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SIOSub-Service Indicator Service Indicator
)Service Indicator Octet (SIO MSU : )Service Indicator (SI MTP ) (ID SI MSU 3 MTP MTP .
Sub-Service Indicator .
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)Status Indicator (SI LSSU LSSU SIO SIB SIOS...
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7SS
FCS 1 FCS 1+5^ X^16+X^12+X FCS FCS 2 MTP 1 FCS FCS FCS ) (
2 MTP : Basic method Preventive Cyclic Retransmision method
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3MTP 2MTP 1MTP M T P
3MTP
) (Network OSI ) 2 MTP (
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MTP3 Users 3MTP 2MTP
Distribution Distribution Function Function SCCP ISUP etc
Discrimination Discrimination Function Function
Routing Routing Function Function
) (DPC
SIO 3 MTP
DPC SLS ) (Overload
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:
: . : : : : MTP : :
) (
: STP STP : STP STP STP : STP STP STP
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ISUP : ) (Setup ) ( ) ( ) (Release ) ( ISUP ISDN Non ISDN
ISUP
)CIC (Circuit Identification Code
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ISUP
)IAM (Initial Address MessageCalled number, calling number, transmission requirement, type of , caller The call is through-connected to the destination A one-way-audio path is opened for ring-back tone Optional If not returned, no ring-back tone at all Optional; provide information to the calling switch Open the transmission path in both directions Instigate charging for the call
)ACM (Address Complete Message
)CPG (Call Progress
ANM, Answer Message
)REL (Release )RLC (Release Complete
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SCCP 3MTP Connectionless Connection-oriented (Global Title Translation (GTT
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Connectionless
:
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Connection-oriented
: ) ( Local Reference )SCCP (SCCP
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UsersMAPOMAP
SCCPSCCP Connection-oriented SCCP Control Control (SCOC) (SCOC) SCCP SCCP Routing Routing Control Control (SCRC) (SCRC)
MTP3
SCCP
HLR VLR MSC EIR SCCP management SCCP management (SCMC) (SCMC) SCCP Connectionless Control SCCP Connectionless Control (SCLC) (SCLC)
SCRC MTP SCCP
: :
SCOCConnection-oriented (Segmentation) (Sequencing) ( Flow control)
SCLCConnectionless
SCLC: SCCP SCCP SCCP
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Mandatory Variable Parameters
Pointers
Mandatory Fixed Parameters
Message Type
Routing Label
SCCP
) (
00 EO .
.
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SCCP)CdPA , CaPA (>2Byte : )SPC (2 Bytes )SSN (1 Byte )Global Title (> 3 Bytes
)Credit (3Bytes 1,3 ) ( Secured SCCP UnACK
)End of optional parameters (1 Byte
)Message Type (1Byte
)Protocal class (1Byte
)0 , 1 , 2 , 3(
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SCCP)Release Cause (1Byte ) (SCCP Connection 0FHex
)Refusal Cause (1Byte
)Return cause (1Byte UDTS UDTS UDT
)SLR/DLR (each 3 Bytes
23 ) (Local Reference ) (virtual connection
)Segmenting /Reassembling (1Byte 1 DT 652 652 1DT
)Sequencing /Segmenting (2 Bytes 2 DT IT (P(R) P(S SCCP Segmentation ) ( S/R. (P(R) P(S FSN BSN 2 MTP .
)Subsystem Number (1 Byte SCCP
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SSN
SSN SCCP SCCP SCCP 552 SSN
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MSC
SCCP CR SLR ) ( CC SLR DLR 1 DT RLSD RLC
: :1DT 1DT RLSD RLSD RLC RLC
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A-Interface MAP BSSAP Q931 SCCP MTP TCAP SCCP MTP Abis-Interface Q931 LAPD Air-Interface Q921 LAPDm
HLR
VLRE1/T1
MSC
E1/T1
BSC
E1/T1
BTS
Air
EIR
AC
SS7
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GSM protocol layers for signalingUm Abis A
MSCM MM RR LAPDm m radio
BTS
BSC
MSCCM MM
RR LAPDm radio
BTSM LAPD PCM
RR BTSM LAPD PCM
BSSAP SS7 PCM
BSSAP SS7 PCM
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GSM MS
SSHLR
MM + CM
MSC VLR
1 4 7
2 5 8 0
3 6 9 #
RRBSC
BTS Radio interface
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A-InterfaceTRAULAPD TS1 OAM Uncompressed Speech TS Compressed Speech TS64 Kbps
BSC
64 KbpsCCS7 TS
Transcoding
64 Kbps 64 Kbps 64 Kbps
MSC
CCS7 TS
X.25 TS2
X.25 TS2
OMC
PCM LINK
PCM LINK
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A-InterfaceTRAULAPD TS1 OAM Uncompressed Speech TS Compressed Speech TS64 Kbps
BSC
64 KbpsCCS7 TS
Transcoding
64 Kbps 64 Kbps 64 Kbps
MSC
CCS7 TS
X.25 TS2
X.25 TS2
OMC
PCM LINK
PCM LINK
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CC/MM
DTAP
BSSAP MSC
MS
BSC
RR
BSSMAP
SCCP0 0 0 0
Data (BSSAP)
Length (8 Bits)
Header BSSMAP (1 Byte)
SCCP
DTAP (2 Bytes)
0
0
0
1
Byte-1
DLCI 0 0 0 0 0 C B SAPI A
Byte-2
0
0
0
0
0
0
0
0
0 --------->RR, MM, CC 3 --------->SMS, SS
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BSSMAP
Data (BSSAP)
Parameter N
Parameter N-1
...
Parameter A
Parameter A
Parameter A
Message Type
Optional Parameters
Mandatory Parameters
Data
Length
IEI
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DTAP
Data (BSSAP)
Parameter N
Parameter N-1
...
Parameter A
Parameter A
Parameter A
Message Type
Optional Parameters
Mandatory Parameters
Data Data
Length
IEI IEI
Optional Variable Length Optional Fixed Length Data
Data Length
Mandatory Fixed Length Mandatory Variable Length
HLR
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EIR
MSC VLR
TCAP
TCAP SCCP MTP
Connectionless SCCP )(Applications TCAP )(Queries ) (Responses SSP SCP MAP MSC TCAP ,Authentication HLR Checking, Roaming IMEI
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