1 |
The User Equipment (UE) initiates a General Packet Radio Service (GPRS) IP-CAN session establishment request to the Serving
GPRS Support Nodes (SGSNs). The SGSN sends Establish IP-CAN Session (PDP context activation) Request to the SAEGW(GGSN)-C.
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2a |
The SAEGW(GGSN)-C sends the access request to AAA-interaction to query about the User-Name, calling-station-id, called-station-id,
NAS-IPAddress, and RAT Type.
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2b
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The SAEGW(GGSN)-C sends the request to AAA-interaction to query about the s6b-AAR details:
AAR {Session-ID, MIP6-Agent-Info (PGW-FQDN ), User Name (IMSI-NAI), APN, RAT-Type} framed-ip-address
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3a
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The AAA interacts with GGSN for Access-Accept of:
User-name, calling-station-id, called-station-id, framed-ip-address, nas-ipaddress
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3b |
The AAA interacts with GGSN for s6b-AAA details.
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4 |
The SAEGW(GGSN)-C sends CCR-I to PCRF for IP-CAN session establishment procedure. |
5 |
The PCRF responds with CCA-I for IP-CAN session establishment to SAEGW(GGSN)-C. |
6a |
The SAEGW(GGSN)-C sends the CCR-I request to OCS. |
6b |
The OCS responds with the CCA-I to SAEGW(GGSN)-C. |
7 |
After Gx, Gy, interaction Performs User Plane selection based on user-plane-profile configured with IP Pool (APN associated
with IP Pool).
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Establishes GTP-U session (required for RA/RS, in case of IPv6/IPv4v6 PDN).
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Performs Sxb interaction with selected User Plane for establishing GTP-U path with SGSN.
SAEGW(GGSN)-C sends Sx Session Establishment Request to SAEGW-U:
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UL-PDR – PDI {src=access, local-fteid: ch=1, UEIPAddress}, outer-header-removal)
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DL-PDR (PDI with UEIPAddress, Rulebase)
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UL-FAR (applyaction=forward, params=core, apn)
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DL-FAR (applyaction=forward, params=access, outer-header-creation gtpu-teid, gtpu-ipaddress)
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QER (correlation-id, mbr, gate-status)
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URR (measurement-method, reporting-trigger,volume/time thresholds)
Note
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Create Uplink PDR is sent with "Outer Header Removal" based on IP address information in "Tunnel ID Data I" and "GSN Address"
for Data.
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Create Downlink FAR is sent with "Outer Header Creation" as "Tunnel ID Data I" and "GSN Address" for Data.
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8 |
The SAEGW(GGSN)-U sends Sx Session Establishment Response (Created-PDR, local-FTEID) to SAEGW-C.
User Plane provides following information as part of Sx Session Establishment Response:
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9 |
On receipt of Sx Session Establishment Response, the SAEGW(GGSN)-C sends Create PDP Context Response toward SGSN with "Tunnel
ID Data I" and "GSN Address" for Data from the information received in Sx Session Establishment Response.
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