Mobile terminated call establishment during inter radio access technology (IRAT) re-direction
View Patent ↗Mobile terminated call establishment during inter radio access technology (IRAT) re-direction. Handovers between different respective radio access technologies (RATs) may be performed (e.g., IRAT redirection procedure) such that a given wireless communication device may be in communication with a given RAT cell, and then switch from that RAT cell to another RAT cell (e.g., a target RAT cell). This transition may be from a 3G cell to a target 4G cell. During such a redirection procedure, there may be some instances in which the target RAT cell may not be available immediately, and a device can check back with the first/original RAT cell during the search for the target RAT cell. That is to say, there may be some duration of time during the search for the target RAT cell in which that particular cell may not be available, and the device checks for pages in the first/original RAT cell.
1. An apparatus comprising:
a processor; and
a radio, the radio and the processor configured to:
support communication with at least one wireless communication device based on each of a plurality of radio access technologies (RATs);
monitor for paging information associated with a first of the plurality of RATs during search for a second of the plurality of RATs when performing an inter radio access technology (IRAT) redirection procedure to transition from the first of the plurality of RATs to the second of the plurality of RATs;
abort the IRAT redirection procedure and support the communication only based on the first of the plurality of RATs when paging information associated with the first of the plurality of RATs is detected by the radio during the search for the second of the plurality of RATs; and
continue the IRAT redirection procedure to transition from the first of the plurality of RATs to the second of the plurality of RATs when no paging information associated with the first of the plurality of RATs is detected by the radio during the search for the second of the plurality of RATs.
2. The apparatus of claim 1 , wherein the radio and the processor are further configured to:
re-tune to the first of the plurality of RATs to check for the paging information associated with the first of the plurality of RATs after a failure to connect via the second of the plurality of RATs within a predetermined period of time.
3. The apparatus of claim 1 , wherein the radio and the processor are further configured to:
re-tune to the first of the plurality of RATs to check for the paging information associated with the first of the plurality of RATs a plurality of times during the search for the second of the plurality of RATs, wherein the plurality of times are spaced apart periodically within a time period associated with the search for the second of the plurality of RATs.
4. The apparatus of claim 1 , wherein the paging information associated with the first of the plurality of RATs corresponding to at least one discontinuous reception cycle (DRX) of the first of the plurality of RATs.
5. The apparatus of claim 1 further comprising:
a mobile wireless communication device; and
the radio and the processor configured to connect with a base station to support the communication with the at least one wireless communication device.
6. An apparatus comprising:
a processor; and
a radio, the radio and the processor configured to:
support communication with at least one wireless communication device based on each of a plurality of radio access technologies (RATs); and
monitor for paging information associated with a first of the plurality of RATs during search for a second of the plurality of RATs when performing an inter radio access technology (IRAT) redirection procedure to transition from the first of the plurality of RATs to the second of the plurality of RATs including monitoring for the paging information by re-tuning the radio to the first of the plurality of RATs to check for the paging information associated with the first of the plurality of RATs a plurality of times during the search for the second of the plurality of RATs.
7. The apparatus of claim 6 , wherein the radio and the processor are further configured to:
re-tune to the first of the plurality of RATs to check for the paging information associated with the first of the plurality of RATs after a failure to connect via the second of the plurality of RATs within a predetermined period of time.
8. The apparatus of claim 6 , wherein the radio and the processor are further configured to:
search for the second of the plurality of RATs during a plurality of non-uniform periods of times within a time period associated with the search for the second of the plurality of RATs.
9. The apparatus of claim 6 , wherein the plurality of times are spaced apart periodically within a time period associated with the search for the second of the plurality of RATs.
10. The apparatus of claim 6 , wherein the paging information associated with the first of the plurality of RATs corresponds to at least one discontinuous reception cycle (DRX) of the first of the plurality of RATs.
11. The apparatus of claim 6 , wherein the radio and the processor are further configured to:
abort the IRAT redirection procedure and effectuate communication only based on the first of the plurality of RATs when paging information associated with the first of the plurality of RATs is detected by the radio during the search for the second of the plurality of RATs.
12. The apparatus of claim 6 , wherein the radio and the processor are further configured to:
continue the IRAT redirection procedure to transition from the first of the plurality of RATs to the second of the plurality of RATs when no paging information associated with the first of the plurality of RATs is detected by the radio during the search for the second of the plurality of RATs.
13. The apparatus of claim 6 further comprising:
a mobile wireless communication device; and
the radio and the processor configured to connect with a base station to support the communication with the at least one wireless communication device.
14. A method for execution by a wireless communication device communication device, the method comprising:
operating a radio of the wireless communication device to support communication with at least one additional wireless communication device based on each of a plurality of radio access technologies (RATs); and
monitoring for paging information associated with a first of the plurality of RATs during search for a second of the plurality of RATs when performing an inter radio access technology (IRAT) redirection procedure to transition from the first of the plurality of RATs to the second of the plurality of RATs including monitoring for the paging information by re-tuning the radio to the first of the plurality of RATs to check for the paging information associated with the first of the plurality of RATs a plurality of times during the search for the second of the plurality of RATs.
15. The method of claim 14 further comprising:
operating the radio to re-tune to the first of the plurality of RATs to check for the paging information associated with the first of the plurality of RATs after a failure to connect via the second of the plurality of RATs within a predetermined period of time.
16. The method of claim 14 , wherein the plurality of times are spaced apart periodically within a time period associated with the search for the second of the plurality of RATs.
17. The method of claim 14 , wherein the paging information associated with the first of the plurality of RATs corresponds to at least one discontinuous reception cycle (DRX) of the first of the plurality of RATs.
18. The method of claim 14 further comprising:
when paging information associated with the first of the plurality of RATs is detected by the radio during the search for the second of the plurality of RATs, aborting the IRAT redirection procedure and supporting the communication only based on the first of the plurality of RATs.
19. The method of claim 14 further comprising:
when no paging information associated with the first of the plurality of RATs is detected by the radio during the search for the second of the plurality of RATs, continuing the IRAT redirection procedure to transition from the first of the plurality of RATs to the second of the plurality of RATs.
20. The method of claim 14 , wherein the wireless communication device is a mobile wireless communication device; and further comprising:
operating the radio to connect with a base station to support the communication with the at least one additional wireless communication device.