week#7 sigtran and sctp - wordpress.com · –transforming signaling format, ex. sip ss7 • media...

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Fathur AB

Anin A

Afif A

Hari A

Gary A

Dhika AB

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Mirel AB

Hani AB

Airita AB

Yusuf AB

Pilsung AB

Taegyun A


Signaling Transport Stream Control Transmission Protocol

Course Number : TTH2A3

CLO : 2

Week : 7


Media Gateway on NGN

• Media Gateway (MG)

– On Transport plane that connects different type of network – Trunk Gateway, connects packet-based network with trunk network from PSTN

or ISDN – Access Gateway, provides services to CPE – Residential Gateway, connects

packet-based network with analog network

• Signaling Gateway (SG)

– Transforming signaling format, ex. SIP SS7

• Media Gateway Controller (MGC)

– Control Media Gateway and Signaling Gateway

– aka. Soft Switch (call setup for multimedia communication, detect and manage events, and manage media gateway based on configuration)

– Use MGCP (MGC Protocol) from ITU-T or Megaco from IETF


Layers in NGN

4


Signaling Transport (SIGTRAN)


SIGTRAN and SCTP

• SIGTRAN = Signaling Transport

• IETF standard since 2000 (IETF = Internet Engineering Task Force) for transmitting PSTN Signal (SS7) via IP Network

• SCTP supports node-to-node transport for SS7 traffic between SG/MG and MGC

Note:

• SG = Signaling Gateway

• MG = Media Gateway

• MGC = MG Controller


SS7 Architecture

1. Signaling Data Link defines the physical, electrical and functional characteristics and the means to access it

2. Signaling Link defines the functions and procedures for and relating to the transfer of signaling messages over one individual signaling data link

3. Signaling Network defines those transport functions and procedures that are common to and independent of the operation of individual signaling links

4. User Part


SIGTRAN Protocol

SS7’s MTP1 and MTP2 are replaced by SIGTRAN to enable signaling over IP


User Adaptation (UA) Layers – M2PA

• Function: encapsulates any other signaling protocol to be transmitted via IP network through SCTP, ex. MTP2’s user Peer-to-peer Adaptation layer (M2PA) transform SS7 MTP signaling messages

• M2PA provides SS7 over IP Network


User Adaptation (UA) Layers – M2UA

• MTP2 User Adaptation layer (M2UA) sends signaling message between MTP3’s MGC and MTP2’s SG

• Works as client-server, where MGC (IP node) acts as client and SG as server

Note:

• MGC = Media Gateway Controller



User Adaptation (UA) Layers – M3UA

• MTP3 User Adaptation (M3UA) works as client-server to provide remote connection for backhauling

Note:



• SCCP = Signalling Connection Control Part

• TCAP = Transaction Capabilities Application Part


User Adaptation (UA) Layers – SUA

• SUA (SCCP User Adaptation) provides other transformation capabilities for legacy services, such as toll free, prepaid, and roaming

• 3GPP chooses M3UA for UMTS signaling protocol due to SUA limitation on transporting ISUP messages

Note:



• SCCP = Signalling Connection Control Part

• TCAP = Transaction Capabilities Application Part


Stream Control Transmission Protocol (SCTP)


What is SCTP?

SCTP is the transport protocol for SIGTRAN, which makes every transformed signaling message from Adaptation Layer can be transferred via IP Network


Why SCTP?

• UDP unreliable due to the nature of no ACK

• TCP reliable, but head-of-line blocking creates long transmission delay when a packet found as ERR

• SCTP reliable, and independent messages creates shorter re-transmission


See you on next class

week#7 sigtran and sctp - wordpress.com · –transforming signaling format, ex. sip ss7 • media...

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