Ericsson :
Ericsson MGW works as SG(W) as well.
They interface HSL/TDM links at one end and SIGTRAN on the other side and perform the signaling transfer over traditional/SIGTRAN networks.
The issue is since SIGTRAN don't carry any SLS bit and MGW performs MTP3 functionality (i.e. reads the message and routes to MSC if the DPC is MSC-Server, Ex : POI Links-ISUP / BSSAP/RANAP ), it looses the balancing control and loads SLS -0 to 7 and leaves SLS-8 to 15 on the TDM Side in the ratio of 75% to 25% of total traffic.
Huawei :
When I observed the same in HUAWEI, they do MTP2 analysis at MGW. All signaling messages are sent to MSC-Server. For GCP protocol huawei uses specific interfaces and never mixes any other traffic like ISUP/SCCP on the same HW.
So their software focuses on the end to end analysis rather than do everything. The outcome there is perfect load balancing at TDM Links side.
Ericsson MGW works as SG(W) as well.
They interface HSL/TDM links at one end and SIGTRAN on the other side and perform the signaling transfer over traditional/SIGTRAN networks.
The issue is since SIGTRAN don't carry any SLS bit and MGW performs MTP3 functionality (i.e. reads the message and routes to MSC if the DPC is MSC-Server, Ex : POI Links-ISUP / BSSAP/RANAP ), it looses the balancing control and loads SLS -0 to 7 and leaves SLS-8 to 15 on the TDM Side in the ratio of 75% to 25% of total traffic.
Huawei :
When I observed the same in HUAWEI, they do MTP2 analysis at MGW. All signaling messages are sent to MSC-Server. For GCP protocol huawei uses specific interfaces and never mixes any other traffic like ISUP/SCCP on the same HW.
So their software focuses on the end to end analysis rather than do everything. The outcome there is perfect load balancing at TDM Links side.
A Practical Example of SG(W) Functionality:
The following traces and screenshots show the practical involvement
SG(W) functionality.
A Mobil Terminating Call
Coming from PSTN to Mobile Network where MGW acts as SG(W) (Logical Call Control)
:
A Mobil Terminating Call Coming from PSTN to Mobile Network where
MGW acts as SG(W) (Phyical Message Flow) :
