SS7/IP
CONCEPTOS EN EL ENTORNO SIGTRAN
Signalling point A
MSC (Server)
Signalling point B
Association Set
SCTP Association
CCSU_0
MGW (Client)
ISU_0
IP
CCSU_1
CCSU_2
ISU_1
ISU_2
CM
CM
SPC_1
IP Addresses
SPC_2
• Con el uso de IP, cada LINK de Señalización está asociado con 1 ASSOCIATION SET
• 1 ASSOCIATION SET puede conformarse de hasta 32 ASSOCIATIONS (Envío de Mensajes DESORDENADOS)
• 1 ASSOCIATION SET puede conformarse de hasta 16 ASSOCIATIONS
(Envío de Mensajes ORDENADOS, donde el SLS se usa para compartir la carga entre los ASSOCIATIONS)
• El STATUS de LINK sigue al STATUS del ASSOCIATION SET
(El LINK se activará cuando al menos 1 ASSOCIATIONS dentro del ASSOC. SET correspondiente se active.
• Cada ASSOCIATION está definido por la unidad de Señalización en la cual existe y por la dirección IP del destino.
• Se recomienda configurar ASSOCIATION SET cuyos ASSOCIATIONS esten controlados por distintas unidades de
Señalización. (PARA GARANTIZAR REDUNDANCIA Y DISTRIBUCIÓN UNIFORME DE CARGA ENTRE LAS UNIDADES)
• El ASSOCIATION SET es un concepto específico de la arquitrectura NOKIA
PILA DE PROTOCOLOS SIGTRAN
CAP/MAP/..
CAP/MAP/..
BSSAP
TCAP
ISUP/TUP
SCCP
ISUP/TUP
SCCP
MTP3
MTP3
M3UA
M3UA
MTP2
MTP2
SCTP
SCTP
MTP1
MTP1
IPv4/IPv6
IPv4/IPv6
SIGTRAN
TDM SS7
CAP/MAP/..
CAP/MAP/..
RANAP
TCAP
BICC
BSSAP
TCAP
SCCPb
BICC
MTP3b
MTP3b
SSCF-NNI
SSCF-NNI
SSCOP
SSCOP
AAL5/ATM
Broadband SS7
RANAP
TCAP
SCCPb
M3UA
M3UA
SCTP
SCTP
AAL5/ATM IPv4/IPv6
IPv4/IPv6
SIGTRAN
USOS DE SIGTRAN EN REL.4 (MSS)
MAP
MAP
TCAP
TCAP
SMSC
SCCP
M3UA
SCCP
M3UA
HLR
SCTP
SCTP
IP
IP
BICC
MSC Server
RANAP
SCCP
SCCPb
SCTP
M3UA
M3UA
IP
SCTP
SCTP
IP
IP
IP
M3UA
PSTN/
ISDN
ISUP
BSSAP
MSC Server
RAN/BSS
ISUP
MTP3
MGW
M3UA
SCTP
IP
MGW
MGWs act as Signaling GWs
SCTP
•
•
Stream Control Transmission Protocol (RFC 2960)
– Packet-oriented delivery
– Sequence delivery within multiple streams
– Optional multiplexing of user messages into the SCTP
datagram (bundling)
– Network level fault tolerance (SCTP multi-homing)
– Resistance flooding and masquerade attack
– SCTP heartbeating
Stream Control transmission Protocol (SCTP) Checksum
Change (RFC 3309) - described the CRC 32C checksum
method
M3UA
•
•
•
•
•
Support for the transfer of all SS7 MTP3 user parts messages (e.g. ISUP,
SCCP, TUP etc.)
Support for the seamless operation of the MTP3 user protocol peer
Support for the management of SCTP transport associations
Support for MGC (Media Gateway Controller) fail over and load sharing
Support for asynchronous reporting of status changes to network
management
– SG (Signaling Gateway)
– ASP (application Server Process) – process instance of an Application
Server
ESTRUCTURA DEL MENSAJE DE M3UA
CONFIGURACIÓN DE SIGTRAN
1. Create an association set (OYC)
ZOYC:<association set name>:<role>;
2. Add associations to the association set (OYA)
ZOYA:<association set name>:<unit type>,<unit index>:[source port
number]:<first destination IP address>,[netmask length]:[second destination IP
address,[netmask length]:<parameter set name>;
3. Check the associations (OYI)
ZOYI::;
4. Give IP addresses to own signalling units
ZQRN
5. Add IP addresses for SCTP multihoming (OYN)
ZOYN:<unit type>,<unit index>:<IP address version>: <primary source IP
address>,[secondary source IP address];
6. Create IP type SS7 signalling link and link set (NSP)
ZNSP:<signalling network>,<signalling link point code>,<signalling link set
name>,<signalling link number>:<association set>;
7. Create signalling route set (NRC)
ZNRC:<signalling network>,<signalling point code>, <signalling point
name>,<parameter set number>,<load sharing status>,<restriction
status>:<signalling transfer point code>,<signalling transfer point
name>,<signalling route priority>;
8. Activate the IP configuration
ZNLC:<signalling link number>,<state>;
Note
Cuando el usuario Activa el Link de Señalización, el Sistema automáticamente
intenta activar los ASSOCIATION que pertenecen al ASSOCIATION SET
correspondiente. El Link de Señalización estará Activo, Si al menos 1 de los
ASSOCIATIONS que pertenecen al ASSOCIATION SET se activa.
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