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Content for  TS 23.334  Word version:  18.1.0

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6.2.14 Access Transfer procedures with media anchored in IMS-AGW (ATGW)  6.2.14.1 General  6.2.14.2 H.248 context model 
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6.2.14  Access Transfer procedures with media anchored in IMS-AGW (ATGW) |R10|  p. 139

6.2.14.1  General  p. 139

This clause describes extensions to the Iq signalling procedures and their interactions with SIP signalling in the control plane and with user plane procedures to support the "SRVCC enhanced with ATCF" procedures between the IMS-ALG (ATCF) and IMS-AGW (ATGW) when the IMS-ALG and IMS-AGW support the ATCF and ATGW functionality, as specified in TS 23.237 and TS 24.237.
The Access Transfer procedures are optional to support on the Iq reference point. The requirements in this clause shall apply if these procedures are supported.
All message sequence charts in this clause are examples.
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6.2.14.2  H.248 context model  p. 139

Figure 6.2.14.2.1 shows the H.248 context model after the PS originating or terminating session establishment and before the PS to CS access transfer procedure. The "squared" line represents the call control signalling. The "dotted" line represents the bearer. The bearer termination T1 is used for the media path of the PS access leg, the bearer termination T2 is used for the media path of the remote leg.
Copy of original 3GPP image for 3GPP TS 23.334, Fig. 6.2.14.2.1: H.248 Context Model before Access Transfer
Figure 6.2.14.2.1: H.248 Context Model before Access Transfer
(⇒ copy of original 3GPP image)
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Figure 6.2.14.2.2 shows the H.248 context model during the PS to CS access transfer procedure. The IMS-ALG (ATCF) may seize a new bearer termination T3 for the new media path of the CS access leg, e.g. if the PS and CS nodes before and after the handover are reachable via different IP realms or use a different IP version. The IMS-ALG (ATCF) may alternatively reconfigure the T1 termination with the new remote configuration (e.g. IP address and media) instead of seizing a new termination; in that case, the H.248 context model remains as before access transfer.
Bi-casting is not supported during access transfer, i.e. the IMS-AGW (ATGW) does not duplicate downlink media packets received from the remote leg to the source and target access legs simultaneously.
Copy of original 3GPP image for 3GPP TS 23.334, Fig. 6.2.14.2.2: H.248 Context Model during Access Transfer
Figure 6.2.14.2.2: H.248 Context Model during Access Transfer
(⇒ copy of original 3GPP image)
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Figure 6.2.14.2.3 shows the H.248 context model after the PS to CS access transfer procedure if the source access leg is released. If the UE chooses to retain some media flow(s) in the transferred-out access, the H.248 context model remains as during access transfer.
Copy of original 3GPP image for 3GPP TS 23.334, Fig. 6.2.14.2.3: H.248 Context Model after Access Transfer
Figure 6.2.14.2.3: H.248 Context Model after Access Transfer
(⇒ copy of original 3GPP image)
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