Mobility detection and system acquisition in dual standby dual subscriber identity modules (DSDS)

1. A method for wireless communications, comprising:

establishing connections with at least two networks using first and second subscriptions, by a mobile device sharing a single radio resource for both connections;

utilizing the single radio resource for the first subscription while out of service for the second subscription;

detecting, while out of service in the second subscription, a mobility status change of the mobile device; and

determining a power save duration for the second subscription based, at least in part, on the mobility status.

2. The method of claim 1 , wherein detecting the mobility status change comprises determining at least one of:

a cell reselection, a location area change, or a Public Land Mobile Network (PLMN) change of the first subscription.

3. The method of claim 1 , wherein detecting the mobility status change comprises:

determining a detected change in signal strength of a serving cell of the first subscription.

4. The method of claim 1 , wherein detecting the mobility status change comprises:

using triangulation by measuring strength of signals from one or more reachable cells of the first subscription.

5. The method of claim 1 , wherein:

the mobile device is idle in the first and second subscriptions; and

the method further comprises performing system acquisition of the second subscription in response to detecting the mobility status change.

6. The method of claim 1 , wherein:

the mobile device acquires a mobile originated call on the first subscription; and

the method further comprises performing system acquisition of the second subscription after the mobile originated call ends.

7. The method of claim 1 , wherein:

the mobile device acquires a mobile terminated call on the first subscription; and

the method further comprises performing system acquisition of the second subscription after the mobile terminated call ends.

8. The method of claim 1 , wherein:

the mobile device is idle on the first subscription and out of service on the second subscription; and

the method further comprises searching for a system on the second subscription based on the detected mobility status change.

9. The method of claim 8 , wherein the mobile device acquires service on the second subscription and is out of service on the first subscription.

10. The method of claim 1 , wherein the mobile device has a protocol stack for the first and second subscriptions running on different modem processors, and wherein the first and second subscriptions share a transceiver.

11. An apparatus for wireless communications, comprising:

means for establishing connections with at least two networks using first and second subscriptions, by a mobile device sharing a single radio resource for both connections;

means for utilizing the single radio resource for the first subscription while out of service for the second subscription;

means for detecting, while out of service in the second subscription, a mobility status change of the mobile device; and

means for determining a power save duration for the second subscription based, at least in part, on the mobility status.

12. The apparatus of claim 11 , wherein the means for detecting the mobility status change comprises determining at least one of:

a cell reselection, a location area change, or a Public Land Mobile Network (PLMN) change of the first subscription.

13. The apparatus of claim 11 , wherein the means for detecting the mobility status change comprises:

means for determining a detected change in signal strength of a serving cell of the first subscription.

14. The apparatus of claim 11 , wherein the means for detecting the mobility status change comprises:

means for using triangulation by measuring strength of signals from one or more reachable cells of the first subscription.

15. The apparatus of claim 11 , wherein:

the mobile device is idle in the first and second subscriptions; and

the apparatus further comprises means for performing system acquisition of the second subscription in response to detecting the mobility status change.

16. The apparatus of claim 11 , wherein:

the mobile device acquires a mobile originated call on the first subscription; and

the apparatus further comprises means for performing system acquisition of the second subscription after the mobile originated call ends.

17. The apparatus of claim 11 , wherein:

the mobile device acquires a mobile terminated call on the first subscription; and

the apparatus further comprises means for performing system acquisition of the second subscription after the mobile terminated call ends.

18. The apparatus of claim 11 , wherein:

the mobile device is idle on the first subscription and out of service on the second subscription; and

the apparatus further comprises means for searching for a system on the second subscription based on the detected mobility status change.

19. The apparatus of claim 18 , wherein the mobile device acquires service on the second subscription and is out of service on the first subscription.

20. The apparatus of claim 11 , wherein the mobile device has a protocol stack for the first and second subscriptions running on different modem processors, and wherein the first and second subscriptions share a transceiver.

21. An apparatus for wireless communications, comprising:

at least one processor configured to:

establish connections with at least two networks using first and second subscriptions, by a mobile device sharing a single radio resource for both connections;

utilize the single radio resource for the first subscription while out of service for the second subscription;

detect, while out of service in the second subscription, a mobility status change of the mobile device; and

determine a power save duration for the second subscription based, at least in part, on the mobility status; and

memory coupled to the at least one processor.

22. The apparatus of claim 21 , wherein the at least one processor is configured to detect the mobility status change by determining at least one of:

a cell reselection, a location area change, or a Public Land Mobile Network (PLMN) change of the first subscription.

23. The apparatus of claim 21 , wherein the at least one processor is configured to detect the mobility status change by:

determining a detected change in signal strength of a serving cell of the first subscription.

24. The apparatus of claim 21 , wherein the at least one processor is configured to detect the mobility status change by:

using triangulation by measuring strength of signals from one or more reachable cells of the first subscription.

25. The apparatus of claim 21 , wherein:

the mobile device is idle in the first and second subscriptions; and

the at least one processor is further configured perform system acquisition of the second subscription in response to detecting the mobility status change.

26. The apparatus of claim 21 , wherein:

the mobile device acquires a mobile originated call on the first subscription; and

the at least one processor is further configured to perform system acquisition of the second subscription after the mobile originated call ends.

27. The apparatus of claim 21 , wherein:

the mobile device acquires a mobile terminated call on the first subscription; and

the at least one processor is further configured to perform system acquisition of the second subscription after the mobile terminated call ends.

28. The apparatus of claim 21 , wherein:

the mobile device is idle on the first subscription and out of service on the second subscription; and

the at least one processor is further configured to search for a system on the second subscription based on the detected mobility status change.

29. The apparatus of claim 28 , wherein the mobile device acquires service on the second subscription and is out of service on the first subscription.

30. The apparatus of claim 21 , wherein the mobile device has a protocol stack for the first and second subscriptions running on different modem processors, and wherein the first and second subscriptions share a transceiver.

31. A computer-program product for wireless communications, the computer-program product comprising a non-transitory computer-readable medium having code stored thereon, the code executable by one or more processors for:

establishing connections with at least two networks using first and second subscriptions, by a mobile device sharing a single radio resource for both connections;

utilizing the single radio resource for the first subscription while out of service for the second subscription;

detecting, while out of service in the second subscription, a mobility status change of the mobile device; and

determining a power save duration for the second subscription based, at least in part, on the mobility status.

32. The computer-program product of claim 31 , wherein the code for detecting the mobility status change comprises determining at least one of:

a cell reselection, a location area change, or a Public Land Mobile Network (PLMN) change of the first subscription.

33. The computer-program product of claim 31 , wherein the code for detecting the mobility status change comprises:

code for determining a detected change in signal strength of a serving cell of the first subscription.

34. The computer-program product of claim 31 , wherein the code for detecting the mobility status change comprises:

code for using triangulation by measuring strength of signals from one or more reachable cells of the first subscription.

35. The computer-program product of claim 31 , wherein:

the mobile device is idle in the first and second subscriptions; and

the computer-program product further comprising code for performing system acquisition of the second subscription in response to detecting the mobility status change.

36. The computer-program product of claim 31 , wherein:

the mobile device acquires a mobile originated call on the first subscription; and

the computer-program product further comprising code for performing system acquisition of the second subscription after the mobile originated call ends.

37. The computer-program product of claim 31 , wherein:

the mobile device acquires a mobile terminated call on the first subscription; and

the computer-program product further comprising code for performing system acquisition of the second subscription after the mobile terminated call ends.

38. The computer-program product of claim 31 , wherein:

the mobile device is idle on the first subscription and out of service on the second subscription; and

the computer-program product further comprising code for searching for a system on the second subscription based on the detected mobility status change.

39. The computer-program product of claim 38 , wherein the mobile device acquires service on the second subscription and is out of service on the first subscription.

40. The computer-program product of claim 31 , wherein the mobile device has a protocol stack for the first and second subscriptions running on different modem processors, and wherein the first and second subscriptions share a transceiver.