A.10 UE-initiated removal of an access network from a PDN connection

24.3033GPPMobility management based on Dual-Stack Mobile IPv6Release 17Stage 3TS

Tools: ARFCN - Frequency Conversion for 5G NR/LTE/UMTS/GSM

A.10.1 Binding Update

The UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure is described in subclause 5.8 and the fields of a BU message used for this procedure are depicted in table A.10.1-1.

The UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure is described in subclause 5.8 and the Mobility Options in a BU message used for this procedure are depicted in table A.10.1-2.

Table A.10.1-1: Fields of a BU message for the UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure

Fields	Fields Description	Reference
Sequence Number	Set to a monotonically increasing value.	IETF RFC 6275 [27]
Lifetime	If the Binding Update is to de-register binding of the access network, the Lifetime is set to a value of "0".	IETF RFC 6275 [27]
Lifetime	If the Binding Update is to register the maintained access network, the Lifetime is set to the requested number of time in units of 4 seconds to indicate how long the binding will remain valid.	IETF RFC 6275 [27]
Home Registration (H)	Set to "1" to indicate receiving node can act as this node’s HA	IETF RFC 6275 [27]
Link-local Address Compatibility (L)	The Link-Local Address Compatibility (L) bit is set when the home address reported by the mobile node has the same interface identifier as the mobile node’s link-local address.	IETF RFC 6275 [27]
Key Management Mobility Capability (K)	Set to "1" to indicate IKEv2 SA ability to survive mobility	IETF RFC 6275 [27]
Acknowledge (A)	Set to "1" to request an acknowledgement message.	IETF RFC 6275 [27]
Force UDP encapsulation request (F) Flag	Set to "0" to indicate no forced UDP encapsulation	IETF RFC 5555 [2]
Mobile Router Flag (R)	If the Binding Update is to register the maintained access network, the Mobile Router Flag (R) is set to "1" to indicate home network prefix preservation for the UE.	IETF RFC 3963 [29]
Overwrite Flag (O)	Set to any value if the lifetime field of the Binding Update is set to 0	IETF RFC 5648 [31]
Overwrite Flag (O)	Set to "1" if the lifetime field of the Binding Update is set to any value different from 0	IETF RFC 5648 [31]

Table A.10.1-2: Mobility Options in a BU message for the UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure

Mobility Option	Cat.	Mobility Option Description	Reference
Binding Identifier mobility option	O	For a Binding Update with Lifetime set to "0", the BID and BID-PRI are set to the corresponding entry that the UE wants to remove.	IETF RFC 5648 [31], IETF RFC 6089 [32]
		For a Binding Update with Lifetime not set to "0", the BID and BID-PRI are set to the corresponding entry that the UE wants to maintain.

A.10.2 Binding Acknowledgement

The UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure is described in subclause 5.8 and the fields of a BA message used for this procedure are depicted in table A.10.2-1.

The UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure is described in subclause 5.8 and the Mobility Options in a BA message used for this procedure are depicted in table A.10.2-2.

Table A.10.2-1: Fields of a BA message for the UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure

Fields	Fields Description	Reference
Status	Set to indicate the result.	IETF RFC 6275 [27]
Key Management Mobility Capability (K)	Set as per HA ability to support the feature of updating the IKE SA based on Binding Update processing	IETF RFC 6275 [27], IETF RFC 5555 [2]
Mobile Router Flag (R)	If the Binding Update is to register the maintained access network, the Mobile Router Flag (R) is set to "1"	IETF RFC 3963 [29]
Sequence Number	Set to the value received in the corresponding Binding Update or the last accepted sequence number in the case of Status 135 ("Sequence Number out of window").	IETF RFC 6275 [27]
Lifetime	If the Binding Update is to de-register binding of the access network, the Lifetime is set to a value of "0".	IETF RFC 6275 [27]
Lifetime	If the Binding Update is to register the maintained access network, the Lifetime is set to the granted number of time in units of 4 seconds to indicate how long the binding will remain valid.	IETF RFC 6275 [27]

Table A.10.2-2: Mobility Options in a BA message for the UE-initiated DSMIPv6 removal of an access network from a PDN connection procedure

Mobility Option	Cat.	Mobility Option Description	Reference
NAT Detection Option	C	When present the option contains the F Flag which indicates to the UE that UDP encapsulation is required. Option contains an optionally Refresh Time for the UE to refresh the NAT binding.	IETF RFC 5555 [2]
Binding Refresh Advice	O	Contains a Refresh Interval in units of 4 seconds indicating the remaining time until the UE could send a new home registration to the HA.	IETF RFC 6275 [27]
Binding Identifier mobility option	C	The option is present if the UE sent a Binding Identifier mobility option in the corresponding BU. The Status field is set accordingly.	IETF RFC 5648 [31], IETF RFC 6089 [32]
Binding Identifier mobility option	C	For a Binding Update with Lifetime not set to "0", the BID and BID-PRI are set to the value indicated in the BID mobility option of the received Binding Update.	IETF RFC 5648 [31], IETF RFC 6089 [32]