Tech-invite  3GPPspace  IETFspace
21  22  23  24  25  26  27  28  29  31  32  33  34  35  36  37  38  4‑5x

Content for  TS 23.214  Word version:  18.0.0

Top   Top   Up   Prev   Next
1…   4.3…   5…   5.6…   5.10…   6…   6.3…   6.3.1.2   6.3.1.3…   6.3.1.6…   6.3.2…   6.3.3…   6.3.3.4…   6.3.3.7…   6.3.4…   6.3.4.2…   6.3.4.2.2   6.3.4.3   6.4…   7… 
6.3.1.2 Procedures with SGW change 
...

 

6.3.1.2  Procedures with SGW change  p. 41

6.3.1.2.1  General  p. 41
This clause covers the following two types of procedures involving SGW change:
  • Type 1: Procedures in which only Create Session Request message is sent from MME/SGSN to SGW-C during SGW change.
  • Type 2: Procedures in which Create Session Request message followed by Modify Bearer Request message are sent from MME/SGSN to SGW-C during SGW change.
6.3.1.2.2  Type 1  p. 41
This clause defines interactions between the CP and UP function during the following procedures:
During the above procedures following is the nature of interactions between the CP and UP function:
  • The new SGW-C selects a new SGW-U and creates an Sx session.
  • The PGW-C modifies the PGW-U to update with the F-TEIDu(s) of the new SGW-U.
  • The old SGW-C releases the existing Sx session from the old SGW-U.
Copy of original 3GPP image for 3GPP TS 23.214, Fig. 6.3.1.2.2-1: Interaction between CP and UP function during procedures with SGW change (Type 1)
Figure 6.3.1.2.2-1: Interaction between CP and UP function during procedures with SGW change (Type 1)
(⇒ copy of original 3GPP image)
Up
Step 1.
Procedure as listed in this step is initiated as specified in the relevant clauses of this specification. The relevant steps of the procedure as specified in the Figure above are executed.
Step 2.
The new SGW-C shall select new SGW-U as specified in clause 5.12. The new SGW-C sends Sx Session Establishment Request to the selected SGW-U for creating an Sx session for the UE.
Step 3.
The SGW-U allocates an F-TEIDu for each and every bearer received in the Sx Session Establishment Request. The new SGW-U sends Sx Session Establishment Response to the new SGW-C confirming the successful creation of the Sx session. It includes the F-TEIDu it has allocated for each and every bearer.
Step 4.
The relevant steps of the procedure as specified in the Figure above are executed.
Step 5.
The PGW-C sends an Sx Session Modification Request to the PGW-U. The PGW-C shall include the F-TEIDu(s) of the new SGW-U. Additionally, based on the interaction with the PCRF, the PGW-C may also update other Sx parameters for the PDN connection.
Step 6.
The PGW-U sends Sx Session Modification Response to the PGW-C confirming the success of the Sx session modification.
Step 7.
The relevant steps of the procedure as specified in the Figure above are executed.
Step 8.
The old SGW-C sends Sx Session Termination Request to the old SGW-U to release the Sx session.
Step 9.
The old SGW-U sends Sx Session Termination Response to the old SGW-C confirming the release of the Sx session.
Step 10.
The relevant steps of the procedure as specified in the Figure above are executed.
Up
6.3.1.2.3  Type 2  p. 43
This clause defines interactions between the CP and UP function during the following procedures:
During the above procedures following is the nature of interactions between the CP and UP function:
  • The new SGW-C selects a new SGW-U and creates an Sx session.
  • The SGW-C modifies the Sx session at SGW-U to update the F-TEIDu(s) of the eNB.
  • The PGW-C modifies the PGW-U to update with the F-TEIDu(s) of the new SGW-U.
  • The old SGW-C releases the existing Sx session from the old SGW-U.
Copy of original 3GPP image for 3GPP TS 23.214, Fig. 6.3.1.2.3-1: Interaction between CP and UP function during procedures with SGW change (Type 2)
Figure 6.3.1.2.3-1: Interaction between CP and UP function during procedures with SGW change (Type 2)
(⇒ copy of original 3GPP image)
Up
Step 1.
Procedure as listed in this step is initiated as specified in the relevant clauses of this specification. The relevant steps of the procedure as specified in the Figure above are executed.
Step 2.
The new SGW-C shall select new SGW-U as specified in clause 5.12. The new SGW-C sends an Sx Session Establishment Request to the selected SGW-U for creating an Sx session for the UE. Usage Monitoring Rules may also be included in case of home-routed roaming scenario and if the inter-operator charging is required.
Step 3.
The SGW-U allocates F-TEIDu for each and every bearer received. The new SGW-U sends an Sx Session Establishment Response to the new SGW-C confirming the successful creation of the Sx session. It includes the F-TEIDu it has allocated for each and every bearer.
Step 4.
The relevant steps of the procedure as specified in the Figure above are executed.
Step 5.
The SGW-C sends an Sx Session Modification Request to the SGW-U. It shall include the F-TEIDu of the eNB.
Step 6.
The SGW-U sends an Sx Session Modification Response to the SGW-C confirming the successful modification of the Sx session.
Step 7.
The relevant steps of the procedure as specified in the Figure above are executed.
Step 8.
The PGW-C sends an Sx Session Modification Request to the PGW-U. The PGW-C shall include the F-TEIDu of the new SGW-U. Additionally, based on the interaction with the PCRF, the PGW-C may also update other Sx parameters for the PDN connection.
Step 9.
The PGW-U sends an Sx Session Modification Response to the PGW-C confirming the success of the Sx session modification.
Step 10.
The relevant steps of the procedure as specified in the Figure above are executed.
Step 11.
The old SGW-C sends an Sx Session Termination Request to the old SGW-U to release the Sx session.
Step 12.
The old SGW-U sends an Sx Session Termination Response to the old SGW-C confirming the release of the Sx session.
Step 13.
The relevant steps of the procedure as specified in the Figure above are executed.
Up

Up   Top   ToC