A.10 UE-initiated removal of an access network from a PDN connection
24.3033GPPMobility management based on Dual-Stack Mobile IPv6Release 17Stage 3TS
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] |
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. |
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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] |
Set to "1" if the lifetime field of the Binding Update is set to any value different from 0 |
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] |
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. |
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] |
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. |