7.5 Non-3GPP access related messages
29.2743GPP3GPP Evolved Packet System (EPS)Evolved General Packet Radio Service (GPRS) Tunnelling Protocol for Control plane (GTPv2-C)Release 18Stage 3TS
7.5.1 Create Forwarding Tunnel Request
A Create Forwarding Tunnel Request message shall be sent by a MME to a Serving GW as a part of the MME configures resources for indirect data forwarding during active handover procedure from E-UTRAN to CDMA 2000 HRPD access.
Table 7.5.1-1 specifies the presence requirements and the conditions of the IEs in the message.
Table 7.5.1-1: Information Elements in a Create Forwarding Tunnel Request
|
Information elements |
P |
Condition / Comment |
IE Type |
Ins. |
|
S103 PDN Data Forwarding Info |
M |
The MME shall include the forwarding Infomation for all PDN connections of the UE requesting data forwarding towards the HSGW in the message as S103 PDN Data Forwarding Info information elements. For each of those PDN Connections, an IE with the same type and instance value shall be included. The Serving GW shall forward downlink data to the HSGW via the GRE tunnel identified by the HSGW Address and HSGW GRE Key included in this information element when it receives downlink data forwarded from the eNodeB belonging to the corresponding EPS bearers of the PDN connection. |
S103PDF |
0 |
|
Private Extension |
O |
Private Extension |
VS |
7.5.2 Create Forwarding Tunnel Response
A Create Forwarding Tunnel Response message shall be sent by a Serving GW to a MME as a response to a Create Forwarding Tunnel Request message.
Table 7.5.2-1 specifies the presence requirements and the conditions of the IEs in the message.
The Cause value indicates if Data Forwarding Resources has been created in the Serving GW or not. Data Forwarding Resources have not been created in the Serving GW if the Cause differs from "Request accepted". Possible Cause values are specified in Table 8.4-1.
Only the Cause IE shall be included in the response if the Cause IE contains another value than "Request accepted".
Table 7.5.2-1: Information Elements in a Create Forwarding Tunnel Response
|
Information elements |
P |
Condition / Comment |
IE Type |
Ins. |
|
Cause |
M |
Cause |
0 |
|
|
S1-U Data Forwarding Info |
C |
S1-U Data Forwarding Info shall be included in the message if the Cause contains the value "Request accepted". For each EPS bearer requesting data forwarding which is included in the S103 PDN Data Forwarding Info fields of corresponding Create Forwarding Tunnel Request message, the Serving GW shall assign a Serving GW S1-U Address and Serving GW S1-U TEID pair and included it in the response message as S1-U Data Forwarding Info information element. For each of those EPS bearers, an IE with the same type and instance value shall be included. The eNodeB shall forward downlink data of the EPS bearer to the Serving GW via the GTP-U tunnel identified by the Serving GW S1-U Address and Serving GW S1-U TEID. |
S1UDF |
0 |
|
Private Extension |
O |
Private Extension |
VS |