Measurement gaps triggering for a multi SIM mobile device

1. A modem operative to support multiple subscriber identities, the modem comprising one or more processing circuits configured to:

communicate messages related to either one of at least first and second subscriber identities, but not simultaneously, wherein communicating messages comprises receiving messages, transmitting messages, or both;

when communication activity associated with the first subscriber identity is being performed by the modem, send an indication to a network associated with the first subscriber identity to cause the network to activate compressed mode operation for the first subscriber identity;

monitor signaling associated with the second subscriber identity during a compressed mode gap associated with the first subscriber identity, wherein the signaling associated with the second subscriber identity comprises paging messages conveyed over a paging channel associated with the second subscriber identity;

cause the modem to monitor said paging channel associated with the second subscriber identity during at least one paging occasion associated with the second subscriber identity falling within the compressed mode gap associated with the first subscriber identity; and

when a paging message received on the paging channel associated with the second subscriber identity contains a call setup request:

(A) prompt the user to obtain input, and based on that input selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request responsive to an action by the user; or

(B) execute an automated selection algorithm to selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request; or

(C) perform (A) for at least one class of communication activities associated with the first subscriber identity and perform (B) for at least another class of communication activities associated with the first subscriber identity.

2. The modem of claim 1 , wherein the one or more processing circuits are further configured to, when a paging message received on the paging channel associated with the second subscriber identity contains a call setup request, cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer the call setup request.

3. The modem claim 2 , wherein the one or more processing circuits are further configured to resume communication activities associated with the first subscriber identities after the call associated with the second subscriber identity which has been answered is over.

4. The modem of claim 1 :

wherein the signaling associated with the second subscriber identity comprises signaling for performing measurements associated with the second subscriber identity; and

wherein the one or more processing circuits are configured to cause the modem to perform said measurements associated with the second subscriber identity within the compressed mode gap associated with the first subscriber identity.

5. The modem of claim 4 , wherein the measurements associated with the second subscriber identity pertain to at least one of intra-frequency mobility, inter-frequency mobility, inter-RAT mobility, quality, traffic volume, and User Equipment internal and positioning measurements.

6. The modem of claim 1 , further comprising a signaling schedule memory configured to store data about a scheduling of signaling occasions for at least the signaling associated with the second subscriber identity.

7. A mobile device comprising:

a receiver/transmitter circuit configured to receive and transmit wireless signals; and

a modem operative to support multiple subscriber identities, the modem comprising one or more processing circuits configured to:

communicate messages related to either one of at least first and second subscriber identities, but not simultaneously, wherein communicating messages comprises receiving messages, transmitting messages, or both;

when communication activity associated with the first subscriber identity is being performed by the modem, send an indication to a network associated with the first subscriber identity to cause the network to activate compressed mode operation for the first subscriber identity;

monitor signaling associated with the second subscriber identity during a compressed mode gap associated with the first subscriber identity, wherein the signaling associated with the second subscriber identity comprises paging messages conveyed over a paging channel associated with the second subscriber identity;

cause the modem to monitor said paging channel associated with the second subscriber identity during at least one paging occasion associated with the second subscriber identity falling within the compressed mode gap associated with the first subscriber identity; and

when a paging message received on the paging channel associated with the second subscriber identity contains a call setup request:

(A) prompt the user to obtain input, and based on that input selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request responsive to an action by the user; or

(B) execute an automated selection algorithm to selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request; or

(C) perform (A) for at least one class of communication activities associated with the first subscriber identity and perform (B) for at least another class of communication activities associated with the first subscriber identity.

8. A method of operating a modem to support multiple subscriber identities, the method comprising:

communicating messages related to at least two subscriber identities, but not simultaneously, wherein communicating messages comprises receiving messages, transmitting messages, or both;

when communication activity associated with the first subscriber identity is being performed by the modem, sending an indication to a network associated with the first subscriber identity leading to the network activating compressed mode of operation;

monitoring signaling associated with the second subscriber identity during a compressed mode gap associated with the first subscriber identity, wherein the signaling associated with the second subscriber identity comprises paging messages conveyed over a paging channel associated with the second subscriber identity;

causing the modem to monitor said paging channel associated with the second subscriber identity during at least one paging occasion associated with the second subscriber identity falling within the compressed mode gap associated with the first subscriber identity; and

when a paging message received on the paging channel associated with the second subscriber identity contains a call setup request:

(A) prompting the user to obtain input, and based on that input selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request responsive to an action by the user; or

(B) executing an automated selection algorithm to selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request; or

(C) performing (A) for at least one class of communication activities associated with the first subscriber identity and perform (B) for at least another class of communication activities associated with the first subscriber identity.

9. The method of claim 8 :

wherein said monitoring signaling associated with the second subscriber identity comprises monitoring said paging channel associated with the second subscriber identity during at least one paging occasion associated with the second subscriber identity falling within the compressed mode gap associated with the first subscriber identity.

10. The method of claim 9 , wherein the signaling associated with the second subscriber identity comprises signaling for performing measurements associated with the second subscriber identity, the method further comprising; and

performing the measurements associated with the second subscriber identity within the compressed mode gap associated with the first subscriber identity.

11. The method of claim 10 , wherein the measurements associated with the second subscriber identity pertain to at least one of intra-frequency mobility, inter-frequency mobility, inter-RAT mobility, quality, traffic volume, User Equipment internal and positioning measurements.

12. A computer program product stored in a non-transitory computer readable medium for supporting multiple subscriber identities in a modem, the computer program product comprising software instructions which, when run by a modem, configures the modem to:

communicate messages related to either one of at least first and second subscriber identities, but not simultaneously, wherein communicating messages comprises receiving messages, transmitting messages, or both;

when communication activity associated with the first subscriber identity is being performed by the modem, send an indication to a network associated with the first subscriber identity to cause the network to activate compressed mode operation for the first subscriber identity;

monitor signaling associated with the second subscriber identity during a compressed mode gap associated with the first subscriber identity, wherein the signaling associated with the second subscriber identity comprises paging messages conveyed over a paging channel associated with the second subscriber identity;

cause the modem to monitor said paging channel associated with the second subscriber identity during at least one paging occasion associated with the second subscriber identity falling within the compressed mode gap associated with the first subscriber identity; and

when a paging message received on the paging channel associated with the second subscriber identity contains a call setup request:

(A) prompt the user to obtain input, and based on that input selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request responsive to an action by the user; or

(B) execute an automated selection algorithm to selectively cause the modem to interrupt ongoing communication activities associated with the first subscriber identity and switch to the second subscriber identity to answer or decline the call setup request; or

(C) perform (A) for at least one class of communication activities associated with the first subscriber identity and perform (B) for at least another class of communication activities associated with the first subscriber identity.