Chapter 1 Basic Concepts
Section 1 Mc Interface Introduction
Mc Interface Introduction
Media Gateway Control（MGC）：
.Responsible for maintaining the connecting and controlling status of media channel in MGW.
Media Gateway（MGW）：
.Responsible for media streams exchanging and format-converting. For example, MGW convert the messages format transmitted in TDM bearer to other formats which can be transmitted in IP network.
.Mc interface is a new interface determined in 3GPP R4, which is a standard interface between MSC Server (or GMSC Server) and MGW.
.ATM or IP is provided in physical connection on Mc interface
Mc Interface Function
.The Mc interface provides the capabilities of the static and dynamic resources for the MSC Server (GMSC Server) controlling the various transmission modes (IP/ATM/TDM) in the MGW in the call processing procedure, such as terminal property, terminal connection switching relationship, MGW borne media streams.
.The Mc interface also provides the call independent MGW status maintenance and management capability.
Section 2 H.248 Protocol Introduction
.H.248/MEGACO has been jointly developed within the ITU-T and the IETF. It is named H.248 by the ITU-T and MEGACO by the IETF.
.H.248 is a kind of Media Gateway Control Protocol, in separated Gateway model of Soft Switch Network, H.248 protocol is used for the communication between a media gateway controller (MGC) and a media gateway (MGW), implementing the function of the MGC controlling MGWs.
.As one of the application layer protocols in OSI, H.248 protocol supported by three kinds of transport protocol (UDP、SCTP、MTP3B), and only SCTP and MTP3B used in Mobile Network.
H.248 Protocol Application
H.248 Protocol Application
.As one of Media Gateway Control Protocols, the H.248 protocol is applied on the Mc interface in UMTS core network,
H.248 Protocol Stack
.H.248 protocol is one of application layer protocol, which can be transported on IP (as shown in Figure a) or ATM (as shown in Figure b). At present we usually use IP transport H.248 protocol.
H.248 Code Format
.In H.248 protocol, one information unit is called a message, which coded by binary format or text format.
.MGC must support both formats, while MG support either one. All H.248 messages have same structure.
Chapter 2 Data Configuration
Preparations
Procedure Of Data Configuration .The following commands are used for Mc interface data configuration in MGC.
Steps and command for Mc Interface data configuration in MGC
1.Configure information about MGW :
ADD MGW
2.Configure the SCTP association from MG to MGW :
ADD MCLNK
3.Modify SCTP association parameters(Optional) :
SET SCTPPARA
4.Set MGW function of speech-play(Optional) :
SET/MOD TONECFG
Relationship Between Tables
Key Parameters
FECFG :Make sure the IP address of WIFM and the default gateway configuration are the same with the data layout
MGW:Make sure to set the MSC Server as a SCTP Server
MCLNK:Make sure the local IP address on MSC server and remote IP address on MGW are the same with the data layout
SCTPPARA:Check the checksum arithmetic is same with MGW
Chapter 3 Maintenance Commands
Maintenance Commands
Query MGW information
.Query the all MGWs’ attribute——LST MGW
.Query the status of one MGW—— DSP MGW
Query the information of MGW SCTP association
.Query the all SCTP associations between MGC and MGW——LST MCLNK
.Query the status of one SCTP association—— DSP MCLNK
Maintenance commands about MGW:
.Remove MGW——RMV MGW
.Modify the MGW’ s attribute——MOD MGW
.Active MGW——ACT MGW
.Deactive MGW——DEA MGW
Maintenance commands about SCTP association:
.Remove SCTP association——RMV MCLNK
Chapter 4 Exercise
Exercise
.The following are Mc interface negotiated data between MGC and MGW：
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