EFFICIENT TRANSITION BETWEEN A TRUSTED WLAN AND A WWAN

• US 20170265239A1
• Filed: 07/22/2016
• Published: 09/14/2017
• Est. Priority Date: 03/09/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Zhang, Juan, Payyappilly, Ajith Tom, Santhanam, Arvind Vardarajan, Zhao, Suli, Veerepalli, Sivaramakrishna
• Granted Patent: US 10,448,443 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 65/1016 IP multimedia subsystem [IMS]
• CPC Class Codes: H04W 12/082 using revocation of authorisation
• CPC Class Codes: H04W 36/0022 for transferring data sessions between adjacent core network technologies
• CPC Class Codes: H04W 36/00226 wherein the core network technologies comprise IP multimedia system [IMS], e.g. single radio voice call continuity [SRVCC]
• CPC Class Codes: H04W 36/144 over a different radio air interface technology
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 76/15 Setup of multiple wireless link connections
• CPC Class Codes: H04W 76/30 Connection release
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/06 adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Abstract

Methods, systems, and devices for wireless communication are described. A user equipment (UE) may prevent rejected attachment requests when connecting to a trusted wireless local area network (WLAN) and from a wireless wide area network (WWAN). For example, an attachment packet data network (PDN) connection may be maintained with the WWAN while connected to the trusted WLAN. In some cases, the connection used to maintain the attachment may be an internet protocol (IP) multimedia subsystem (IMS) connection. Alternatively, the UE may determine that the WLAN connection is a trusted connection and deactivate the WWAN connection. Should the WLAN become unavailable the UE may reactivate the connection with the WWAN.

Claims

1. A method of wireless communication comprising:

establishing a connection with a wireless local area network (WLAN);

disconnecting a first packet data network (PDN) connection with a wireless wide area network (WWAN) based at least in part on the established connection with the WLAN;

maintaining a second PDN connection with the WWAN while connected to the WLAN;

determining that the connection with the WLAN is unavailable; and

establishing a third PDN connection with the WWAN based at least in part on the second PDN connection.

2. The method of claim 1, wherein the second PDN connection comprises an attachment PDN that terminates at a WWAN network entity.

3. The method of claim 1, wherein the second PDN connection comprises an internet protocol (IP) multimedia subsystem (IMS) connection.

4. The method of claim 3, further comprising:

refraining from establishing the IMS connection with the WLAN based at least in part on the second PDN connection; and

communicating using the IMS connection over the WWAN while connected to the WLAN.

5. The method of claim 1, further comprising:

receiving a release request from the WWAN based at least in part on the connection with the WLAN, wherein disconnecting the first PDN connection is based at least in part on a detach request.

6. The method of claim 1, further comprising:

refraining from performing an attachment procedure with the WWAN based at least in part on the second PDN connection.

7. A method of wireless communication comprising:

determining that a connection with a wireless local area network (WLAN) comprises a trusted connection;

deactivating a connection with a wireless wide area network (WWAN) based at least in part on the determination that the connection with the WLAN is a trusted connection; and

refraining from performing an attachment procedure with the WWAN based at least in part on deactivating the connection with the WWAN.

8. The method of claim 7, further comprising:

determining that the connection with the WLAN is a trusted connection is based at least in part on an internet protocol (IP) address assigned by the WLAN, a service set identifier (SSID) of the WLAN, an authentication mode of the WLAN, or any combination thereof.

9. The method of claim 7, wherein deactivating the connection to the WWAN comprises:

entering a circuit switch (CS) only mode, disabling a communication mode of the WWAN, initiating a limited service mode, or any combination thereof.

10. The method of claim 7, further comprising:

determining that the connection with the WLAN is unavailable; and

reactivating the connection with the WWAN based at least in part on the determination that the connection with the WLAN is unavailable.

11. The method of claim 7, further comprising:

receiving a detach request from the WWAN based at least in part on the connection with the WLAN.

12. A method of wireless communication comprising:

establishing a first packet data network (PDN) connection with a user equipment (UE) over a wireless wide area network (WWAN);

establishing a second PDN connection with the UE over the WWAN;

establishing a third PDN connection with the UE over a trusted wireless local area network (WLAN);

disconnecting the first PDN connection with the UE based at least in part on the third PDN connection; and

maintaining the second PDN connection while connected to the UE with the third PDN connection.

13. The method of claim 12, wherein the second PDN connection comprises an attachment PDN that terminates at a WWAN network entity.

14. The method of claim 12, wherein the second PDN connection comprises an internet protocol (IP) multimedia subsystem (IMS) connection.

15. The method of claim 12, further comprising:

transmitting a release request to the UE for the first PDN connection based at least in part on the third PDN connection with the trusted WLAN.

16. The method of claim 12, further comprising:

establishing a fourth PDN connection over the WWAN with the UE based at least in part on the second PDN connection.

17. An apparatus for wireless communication comprising:

means for establishing a connection with a wireless local area network (WLAN);

means for disconnecting a first packet data network (PDN) connection with a wireless wide area network (WWAN) based at least in part on the established connection with the WLAN;

means for maintaining a second PDN connection with the WWAN while connected to the WLAN;

means for determining that the connection with the WLAN is unavailable; and

means for establishing a third PDN connection with the WWAN based at least in part on the second PDN connection.

18. An apparatus for wireless communication comprising:

means for determining that a connection with a wireless local area network (WLAN) comprises a trusted connection;

means for deactivating a connection with a wireless wide area network (WWAN) based at least in part on the determination that the connection with the WLAN is a trusted connection; and

means for refraining from performing an attachment procedure with the WWAN based at least in part on deactivating the connection with the WWAN.

19. An apparatus for wireless communication comprising:

means for establishing a first packet data network (PDN) connection with a user equipment (UE) over a wireless wide area network (WWAN);

means for establishing a second PDN connection with the UE over the WWAN;

means for establishing a third PDN connection with the UE over a trusted wireless local area network (WLAN);

means for disconnecting the first PDN connection with the UE based at least in part on the third PDN connection; and

means for maintaining the second PDN connection while connected to the UE with the third PDN connection.

20. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

establish a connection with a wireless local area network (WLAN);

disconnect a first packet data network (PDN) connection with a wireless wide area network (WWAN) based at least in part on the established connection with the WLAN;

maintain a second PDN connection with the WWAN while connected to the WLAN;

determine that the connection with the WLAN is unavailable; and

establish a third PDN connection with the WWAN based at least in part on the second PDN connection.

21. The apparatus of claim 20, wherein the second PDN connection comprises an attachment PDN that terminates at a WWAN network entity.

22. The apparatus of claim 20, wherein the second PDN connection comprises an internet protocol (IP) multimedia subsystem (IMS) connection.

23. The apparatus of claim 22, wherein the instructions are operable to cause the processor to:

refrain from establishing the IMS connection with the WLAN based at least in part on the second PDN connection; and

communicate using the IMS connection over the WWAN while connected to the WLAN.

24. The apparatus of claim 20, wherein the instructions are operable to cause the processor to:

receive a release request from the WWAN based at least in part on the connection with the WLAN, wherein disconnecting the first PDN connection is based at least in part on a detach request.

25. The apparatus of claim 20, wherein the instructions are operable to cause the processor to:

refrain from performing an attachment procedure with the WWAN based at least in part on the second PDN connection.

26. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

determine that a connection with a wireless local area network (WLAN) comprises a trusted connection;

deactivate a connection with a wireless wide area network (WWAN) based at least in part on the determination that the connection with the WLAN is a trusted connection; and

refrain from performing an attachment procedure with the WWAN based at least in part on deactivating the connection with the WWAN.

27. The apparatus of claim 26, wherein the instructions are operable to cause the processor to:

determine that the connection with the WLAN is a trusted connection is based at least in part on an internet protocol (IP) address assigned by the WLAN, a service set identifier (SSID) of the WLAN, an authentication mode of the WLAN, or any combination thereof.

28. The apparatus of claim 26, wherein deactivating the connection to the WWAN comprises:

entering a circuit switch (CS) only mode, disabling a communication mode of the WWAN, initiating a limited service mode, or any combination thereof.

29. The apparatus of claim 26, wherein the instructions are operable to cause the processor to:

determine that the connection with the WLAN is unavailable; and

reactivate the connection with the WWAN based at least in part on the determination that the connection with the WLAN is unavailable.

30. The apparatus of claim 26, wherein the instructions are operable to cause the processor to:

receive a detach request from the WWAN based at least in part on the connection with the WLAN.

31. An apparatus for wireless communication, comprising:

a processor;

memory in electronic communication with the processor; and

instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to;

establish a first packet data network (PDN) connection with a user equipment (UE) over a wireless wide area network (WWAN);

establish a second PDN connection with the UE over the WWAN;

establish a third PDN connection with the UE over a trusted wireless local area network (WLAN);

disconnect the first PDN connection with the UE based at least in part on the third PDN connection; and

maintain the second PDN connection while connected to the UE with the third PDN connection.

32. The apparatus of claim 31, wherein the second PDN connection comprises an attachment PDN that terminates at a WWAN network entity.

33. The apparatus of claim 31, wherein the second PDN connection comprises an internet protocol (IP) multimedia subsystem (IMS) connection.

34. The apparatus of claim 31, wherein the instructions are operable to cause the processor to:

transmit a release request to the UE for the first PDN connection based at least in part on the third PDN connection with the trusted WLAN.

35. The apparatus of claim 31, wherein the instructions are operable to cause the processor to:

establish a fourth PDN connection over the WWAN with the UE based at least in part on the second PDN connection.

36. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable to:

establish a connection with a wireless local area network (WLAN);

disconnect a first packet data network (PDN) connection with a wireless wide area network (WWAN) based at least in part on the established connection with the WLAN;

maintain a second PDN connection with the WWAN while connected to the WLAN;

determine that the connection with the WLAN is unavailable; and

establish a third PDN connection with the WWAN based at least in part on the second PDN connection.

37. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable to:

determine that a connection with a wireless local area network (WLAN) comprises a trusted connection;

deactivate a connection with a wireless wide area network (WWAN) based at least in part on the determination that the connection with the WLAN is a trusted connection; and

refrain from performing an attachment procedure with the WWAN based at least in part on deactivating the connection with the WWAN.

38. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable to:

establish a first packet data network (PDN) connection with a user equipment (UE) over a wireless wide area network (WWAN);

establish a second PDN connection with the UE over the WWAN;

establish a third PDN connection with the UE over a trusted wireless local area network (WLAN);

disconnect the first PDN connection with the UE based at least in part on the third PDN connection; and

maintain the second PDN connection while connected to the UE with the third PDN connection.