Method for responding to failure of specific PDN
One embodiment of the present specification provides a method for responding to a failure of a specific packet data network (PDN) in user equipment (UE). The method can comprise the steps of: receiving information on whether a specific PDN has a failure; determining whether the specific PDN is in a failure state on the basis of the received information; and if it is determined that the specific PDN is in the failure state, performing a detach procedure for the specific PDN or a disconnection procedure for the specific PDN, and then, performing an attach procedure to another PDN or a PDN connection establishment procedure.
1. A method for a user equipment (UE) to respond to a failure in a packet data network (PDN), the method comprising:
receiving first information from a PDN gateway (P-GW), wherein the first information represents that a first PDN based on an internet protocol version 6 (IPv6) is in a failure state;
receiving second information on the need to change the PDN;
determining, by the UE, that a second PDN based on an IP version 4 (IPv4) is capable of providing the same service as provided by the first PDN and is not in a failure state, based on the second information;
performing a detach procedure or a disconnection procedure with the first PDN; and
performing an attach procedure and a PDN connection establishment procedure with the second PDN,
wherein the PDN connection establishment procedure includes:
inserting PDN type information representing the IPv4 into a PDN connectivity request message; and
transmitting the PDN connectivity request message including the PDN type information representing the IPv4.
2. The method of claim 1 , wherein the first information that the first PDN has failed is implicitly received.
3. The method of claim 1 , wherein the first information is received by a Mobility Management Entity (MME), the second PDN, or an Evolved Packet System (EPS) bearer.
4. The method of claim 1 , wherein the first information that the first PDN has failed is explicitly received.
5. A method for an entity responsible for a control plane to respond to a failure in a packet data network (PDN), the method comprising:
receiving, from a PDN gateway (P-GW), first information,
wherein the first information represents that a first PDN based on an internet protocol version 6 (IPv6) is in a failure state;
receiving, from the gateway, second information requesting a PDN change;
determining that a second PDN based on an IP version 4 (IPv4) is capable of providing the same service as provided by the first PDN and is not in a failure state, based on the second information;
performing, for a user equipment (UE), an attach procedure and a PDN connection establishment procedure with a second PDN,
wherein the PDN connection establishment procedure includes:
inserting PDN type information representing the IPv4 into a PDN connectivity request message; and
transmitting the PDN connectivity request message including the PDN type information representing the IPv4.
6. The method of claim 5 , wherein when the attach procedure or PDN connection establishment procedure with the second PDN is performed, the entity subscriber information on the UE from a Home Subscriber Server (HSS), even when the entity has at least one of the subscriber information on the UE and context information of the UE.
7. The method of claim 5 , wherein the first information that the first PDN has failed is implicitly received.
8. The method of claim 7 , further comprising:
when the first information is explicitly received, determining whether a normal service is available on the second PDN.
9. The method of claim 5 , wherein the first information is received by a Mobility Management Entity (MME), the second PDN, or an Evolved Packet System (EPS) bearer.
10. The method of claim 5 , wherein the first information that the first PDN has failed is explicitly received.