SMF and PGWc GTPC Optimization with Inter-rack IPC Call Flow
This section describes the SMF and PGWc GTPC Optimization with Inter-rack IPC call flow.

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Step |
Description |
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1 |
The following are sub-steps in the Alt SMF to SGW flow non-optimized scenario.
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1a |
SMF-service sends the S5 or the S8 Create Bearer Request to R1-GTPC-EP. |
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1b |
R1-GTPC-EP sends the S5 or the S8 Create Bearer Request to R2-GTPC-EP. |
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1c |
R2-GTPC-EP sends the S5 or the S8 Create Bearer Request to SGW-service. |
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1d |
SGW-service processes and sends the S11 Create Bearer Request to R2-GTPC-EP. |
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1e |
R2-GTPC-EP sends the S11 Create Bearer Request to MME. |
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1f |
MME processes and sends the S11 Create Bearer Response to R2-GTPC-EP. |
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1g |
R2-GTPC-EP sends the S11 Create Bearer Response to SGW-service. |
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1h |
SGW-service processes and sends the S5 or the S8 Create Bearer Response to R2-GTPC-EP. |
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1i |
R2-GTPC-EP sends the S5 or the S8 Create Bearer Response to R1-GTPC-EP. |
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1j |
R1-GTPC-EP sends the S5 or the S8 Create Bearer Response to SMF-service. |
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2 |
The following are sub-steps in the SMF to SGW flow-optimized scenario. |
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2a |
SMF-service sends the IPC request to R2-GTPC-EP.
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2b |
R2-GTPC-EP sends the S5 or the S8 Create Bearer Request to SGW-service. |
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2c |
SGW-service processes and sends the S11 Create Bearer Request to R2-GTPC-EP. |
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2d |
R2-GTPC-EP sends the S11 Create Bearer Request to MME. |
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2e |
MME processes and sends the S11 Create Bearer Response to R2-GTPC-EP. |
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2f |
R2-GTPC-EP sends the S11 Create Bearer Response to SGW-service. |
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2g |
SGW-service processes and sends the S5 or the S8 Create Bearer Response to R2-GTPC-EP.
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2h |
R2-GTPC-EP processes and sends the IPC Response to SMF-service. |
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