Mobile terminated call establishment during inter radio access technology (IRAT) re-direction

Abstract

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.

What is claimed is: 
     
         1 . A wireless communication device comprising:
 a radio; and   a processor, the processor and the radio configured to:
 support communication with at least one other wireless communication device based on a first radio access technology (RAT) and a second RAT; and 
 monitor for paging information of the first RAT after a failure to connect via the second RAT after a predetermined period of time during an inter radio access technology (IRAT) redirection procedure from the first RAT and the second RAT. 
   
     
     
         2 . The wireless communication device of  claim 1 , wherein the processor and the radio are further configured to:
 abort the IRAT procedure and support communication with the at least one other wireless communication device based on only the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         3 . The wireless communication device of  claim 1 , wherein the processor and the radio are further configured to:
 firstly allocate radio resources of the radio to search for the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and   secondly allocate the radio resources of the radio to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         4 . The wireless communication device of  claim 1 , wherein the processor and the radio are further configured to:
 firstly allocate radio resources of the radio to search for the second RAT during the IRAT redirection procedure from the first RAT and the second RAT;   secondly allocate the radio resources of the radio to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT; and   thirdly re-allocate the radio resources of the radio to monitor for the paging information of the first RAT after another failure to connect via the second RAT after another predetermined period of time that follows the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         5 . The wireless communication device of  claim 1 , wherein the processor and the radio are further configured to:
 tune from the first RAT to the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and   re-tune back to the first RAT at least once to monitor for the paging information of the first RAT during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         6 . The wireless communication device of  claim 1 , wherein the processor and the radio are further configured to:
 tune from the first RAT to the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and   re-tune back to the first RAT to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         7 . The wireless communication device of  claim 1  further comprising:
 a mobile wireless communication device; and 
 the processor and the radio are further configured to connect with at least one base station to support the communication with the at least one wireless communication device. 
 
     
     
         8 . The wireless communication device of  claim 1  further comprising:
 a cellular telephone, wherein the at least one other wireless communication device includes at least one base station. 
 
     
     
         9 . A wireless communication device comprising:
 a radio; and   a processor, the processor and the radio configured to:
 support communication with at least one other wireless communication device based on a first radio access technology (RAT) and a second RAT; 
 attempt an inter radio access technology (IRAT) redirection procedure from the first RAT and the second RAT including allocating radio resources of the radio to search for the second RAT; 
 monitor for paging information of the first RAT including allocating the radio resources of the radio to search for the first RAT after a failure to connect via the second RAT after a predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT; and 
 abort the IRAT procedure and support communication with the at least one other wireless communication device based on only the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT. 
   
     
     
         10 . The wireless communication device of  claim 9 , wherein the processor and the radio are further configured to:
 tune from the first RAT to the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and   re-tune back to the first RAT at least once to monitor for the paging information of the first RAT during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         11 . The wireless communication device of  claim 9 , wherein the processor and the radio are further configured to:
 tune from the first RAT to the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and   re-tune back to the first RAT to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         12 . The wireless communication device of  claim 9  further comprising:
 a mobile wireless communication device; and 
 the processor and the radio are further configured to connect with at least one base station to support the communication with the at least one wireless communication device. 
 
     
     
         13 . The wireless communication device of  claim 9  further comprising:
 a cellular telephone, wherein the at least one other wireless communication device includes at least one base station. 
 
     
     
         14 . A method for execution by a wireless communication device, the method comprising:
 monitoring for paging information of a first radio access technology (RAT) after a failure to connect via a second RAT after a predetermined period of time during an inter radio access technology (IRAT) redirection procedure from the first RAT and the second RAT;   supporting communication with at least one other wireless communication device based on the first RAT based on failure of the IRAT redirection procedure from the first RAT and the second RAT; and   supporting communication with the at least one other wireless communication device based on the second RAT based on success of the IRAT redirection procedure from the first RAT and the second RAT.   
     
     
         15 . The method of  claim 14  further comprising:
 aborting the IRAT procedure and supporting communication with the at least one other wireless communication device based on only the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT. 
 
     
     
         16 . The method of  claim 14  further comprising:
 firstly allocating radio resources of the radio to search for the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and 
 secondly allocating the radio resources of the radio to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT. 
 
     
     
         17 . The method of  claim 14  further comprising:
 firstly allocating radio resources of the radio to search for the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; 
 secondly allocating the radio resources of the radio to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT; and 
 thirdly re-allocating the radio resources of the radio to monitor for the paging information of the first RAT after another failure to connect via the second RAT after another predetermined period of time that follows the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT. 
 
     
     
         18 . The method of  claim 14  further comprising:
 tuning from the first RAT to the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and 
 re-tuning back to the first RAT at least once to monitor for the paging information of the first RAT during the IRAT redirection procedure from the first RAT and the second RAT. 
 
     
     
         19 . The method of  claim 14  further comprising:
 tuning from the first RAT to the second RAT during the IRAT redirection procedure from the first RAT and the second RAT; and 
 re-tuning back to the first RAT to monitor for the paging information of the first RAT after the failure to connect via the second RAT after the predetermined period of time during the IRAT redirection procedure from the first RAT and the second RAT. 
 
     
     
         20 . The method of  claim 14 , wherein the wireless communication device is a cellular telephone, and the at least one other wireless communication device includes at least one base station.