Establishing reliable always-on packet data network connections

1. A method of wireless communication of a network entity, comprising:

establishing a connection between a user equipment (UE) and a packet data network (PDN);

designating the PDN as having an always-on status; and

while the UE is in an idle mode, notifying the UE when a loss of connection with the PDN is detected based on the always-on status.

2. The method of claim 1 , wherein designating the PDN as having an always-on status comprises receiving information indicating that the UE has signaled to a gateway serving the PDN that the connection between the UE and the PDN is designated as always on.

3. The method of claim 1 , wherein notifying the UE when the loss of connection with the PDN is detected comprises paging the UE upon detecting loss of the connection with the PDN.

4. The method of claim 1 , wherein notifying the UE when a loss of connection with the PDN is detected comprises waiting for a predefined time interval before notifying the UE of loss of the connection.

5. The method of claim 4 , wherein the predefined time interval is calculated based on a time required to attempt reconnection of the PDN.

6. The method of claim 4 , wherein the predefined time interval is determined by a gateway serving the PDN.

7. The method of claim 6 , wherein the predefined time interval is provided by the gateway serving the PDN prior to disconnection of the PDN connection.

8. The method of claim 1 , further comprising:

designating a service provided by the PDN as having an always-on status; and

notifying the UE when a loss of the service is detected based on the always-on status.

9. The method of claim 8 , wherein notifying the UE when the loss of the service with the PDN is detected includes paging the UE upon detecting the loss of the service with the PDN.

10. An apparatus for wireless communication, comprising:

means for establishing a connection between a user equipment (UE) and a packet data network (PDN);

means for designating the PDN as having an always-on status; and

means for notifying the UE, while the US is in an idle mode, when a loss of connection with the PDN is detected based on the always-on status.

11. The apparatus of claim 10 , wherein the means for designating the PDN as having an always-on status is configured to receive information indicating that the UE has signaled to a gateway serving the PDN that the connection between the UE and the PDN is designated as always on.

12. The apparatus of claim 10 , wherein the means for notifying the UE when the loss of connection with the PDN is detected is configured to page the UE upon detecting loss of the connection with the PDN when the UE is in an idle mode.

13. The apparatus of claim 10 , wherein the means for notifying the UE when a loss of connection with the PDN is detected is configured to wait for a predefined time interval before notifying the UE of loss of the connection.

14. The apparatus of claim 13 , wherein the predefined time interval is calculated based on a time required to attempt reconnection of the PDN.

15. The apparatus of claim 13 , wherein the predefined time interval is determined by a gateway serving the PDN.

16. The apparatus of claim 15 , wherein the predefined time interval is provided by the gateway serving the PDN prior to disconnection of the PDN connection.

17. The apparatus of claim 10 , further comprising:

means for designating a service provided by the PDN as having an always-on status; and

means for notifying the UE when a loss of the service is detected based on the always-on status.

18. The apparatus of claim 17 , wherein the means for notifying the UE when the loss of the service with the PDN is detected is configured to page the UE upon detecting the loss of the service with the PDN.

19. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

establish a connection between a user equipment (UE) and a packet data network (PDN);

designate the PDN as having an always-on status; and

notify the UE, while the UE is in an idle mode, when a loss of connection with the PDN is detected based on the always-on status.

20. A non-transitory computer-readable medium having stored thereon computer executable instructions for wireless communication, the instructions comprising:

establishing a connection between a user equipment (UE) and a packet data network (PDN);

designating the PDN as having an always-on status; and

notifying the UE, while the UE is in an idle mode, when a loss of connection with the PDN is detected based on the always-on status and regardless of whether the UE is in an active mode or an idle mode.

21. A method of wireless communication of a user equipment (UE), comprising:

registering with a radio access network (RAN);

establishing a connection with one or more packet data networks (PDNs) through the RAN, wherein a designated PDN has an always-on status;

entering into an idle mode; and

receiving a notification from the network entity when a connection between the designated PDN and the RAN is lost.

22. The method of claim 21 , wherein the connection between the designated PDN and the RAN is lost while in the idle mode, and the notification is received from the network entity after a page initiated by the network entity is received by the UE.

23. The method of claim 22 , wherein the notification is received from the network entity while the UE is connected to at least one other PDN of the one or more PDNs.

24. The method of claim 21 , further comprising designating a service provided by the one or more PDNs as having an always-on status, wherein the notification is received from the network entity when a loss of the service is detected based on the always-on status of the service.

25. The method of claim 24 , wherein the service is lost while in the idle mode, and the notification is received from the network entity after a page initiated by the network entity is received by the UE.

26. An apparatus for wireless communication, comprising:

means for registering with a radio access network (RAN);

means for establishing a connection with one or more packet data networks (PDNs) through the RAN;

means for entering into an idle mode;

means for identifying a designated PDN as having an always-on status to a network entity of the RAN; and

means for receiving a notification from the network entity when a connection between the designated PDN and the RAN is lost.

27. The apparatus of claim 26 , wherein the connection between the designated PDN and the RAN is lost while in the idle mode, and the notification is received from the network entity after a page initiated by the network entity is received by the UE.

28. The apparatus of claim 27 , wherein the notification is received from the network entity while the apparatus is connected to at least one other PDN of the one or more PDNs.

29. The apparatus of claim 26 , further comprising means for designating a service provided by the one or more PDNs as having an always-on status, wherein the notification is received from the network entity when a loss of the service is detected based on the always-on status of the service.

30. The apparatus of claim 29 , wherein the service is lost while in the idle mode, and the notification is received from the network entity after a page initiated by the network entity is received by the UE.

31. An apparatus for wireless communication, comprising:

a memory; and

at least one processor coupled to the memory and configured to:

register with a radio access network (RAN);

establish a connection with one or more packet data networks (PDNs) through the RAN;

enter into an idle mode;

identify a designated PDN as having an always-on status to a network entity of the RAN; and

receiving a notification from the network entity when a connection between the designated PDN and the RAN is lost.

32. A non-transitory computer-readable medium having stored thereon computer executable instructions for wireless communication, the instructions comprising:

registering with a radio access network (RAN);

establishing a connection with one or more packet data networks (PDNs) through the RAN;

entering into an idle mode;

identifying a designated PDN as having an always-on status to a network entity of the RAN;

receiving a notification from the network entity when a connection between the designated PDN and the RAN is lost.

33. The method of claim 1 comprising:

notifying the UE when a loss of connection with an IP Multimedia Subsystem (IMS) PDN is detected based on the always-on status.