Methods and Systems for In-Device Interference Mitigation

Abstract

Methods and apparatus for mitigating in-device interference are described. The methods may include an in-device interference event (e.g. an interference situation), and the processing of events may depend on the priority of the technologies. A handover to another frequency or radio access technology (RAT) may occur in case a co-existing technology may be activated. The network may signal to the device a list of frequencies or RATs that it may be allowed to measure and handoff to. A network may provide a scaling value that the device may use to speed up reaction to the interference. The device may apply a scaling factor to an “out of synch’ counter and/or the radio link failure (RLF) tinier used for the RLF procedure. The device may apply different scaling factors for the measurements and time to trigger events. The device may trigger a report to the network requesting gaps for an alternate RAT.

1 - 23 . (canceled) 
     
     
         24 . A method for mitigating interference between radio access technology (RAT) components in a wireless transmit receive unit (WTRU), the method comprising:
 detecting, at the WTRU, an in-device interference situation between a first RAT component and a second RAT component of the WTRU, wherein the second RAT component is a long term evolution (LTE) component;   determining, at the WTRU, one or more frequencies at which at least one of the first or second RAT component is a victim of the in-device interference situation;   sending, from the WTRU, a notification of the detected in-device interference situation to an LTE network, wherein the notification comprises information for assisting with the detected in-device interference situation, the information indicating which of the first and/or second RAT component is a victim of the in-device interference situation and indicating the one or more frequencies at which the victim is interfered; and   receiving, from the LTE network, an indication of a change in a frequency of operation of the second RAT component based on sending the notification of the detected in-device interference situation.   
     
     
         25 . The method of  claim 24 , wherein the change in the frequency of operation is associated with an inter-frequency handover. 
     
     
         26 . The method of  claim 24 , wherein the change in the frequency of operation is associated with a secondary cell change. 
     
     
         27 . The method of  claim 24 , further comprising performing at least one of the following in response to receiving the indication from the LTE network: a handover for at least one of the first RAT or second RAT component; a redirection to another frequency; a frequency division multiplexing (FDM) operation; or a frequency division duplex (FDD) half duplex operation. 
     
     
         28 . The method of  claim 24 , wherein the in-device interference situation is detected based on or in response to one or more triggers. 
     
     
         29 . The method of  claim 28 , wherein the one or more triggers comprise at least one of the following: proactive triggers; reactive triggers; a handover being initiated; a change in a mode of operation; a change in a usage scenario change; a change in a service scenario change; an expiration of a timer; a generation of a predetermined load; and a size of a buffer. 
     
     
         30 . The method of  claim 24 , wherein the notification of the detected in-device interference situation comprises at least one of the following: an indication the first RAT or second RAT component needs to be activated or is activated; an indication the first RAT or second RAT component needs to be turned or is turned on; information associated with technology types causing the in-device interference situation; an indication of a capability of the WTRU to handle the in-device interference situation; information associated with the first or second RAT component; usage scenario requested by the first RAT or second RAT component;
 service scenario requested by the first RAT or second RAT component; information associated with a timer; information associated with a mode of operation of the first RAT or second RAT component; an indication on when the first or second RAT should be turned on; measurements associated with the first RAT or second RAT component; a hopping frequency associated with the first RAT or second RAT component; a list of frequency supported by the first RAT or second RAT component; an indication of an urgency associated with turning on the first RAT or second RAT component; a request for assisted-global navigation satellite system (A-GNSS); information associated with a source cell; and information associated with a buffer size of the first RAT or second RAT component.   
     
     
         31 . The method of  claim 24 , wherein the notification of the detected in-device interference situation is sent via a radio resource control (RRC) message. 
     
     
         32 . The method of  claim 24 , wherein the first RAT component supports a first radio technology and the second RAT component supports a second radio technology, and wherein the first and second radio technologies are different. 
     
     
         33 . The method of  claim 24 , wherein the notification of the detected in-device interference situation is sent based on a configuration indicating the WTRU is capable or allowed to send the notification. 
     
     
         34 . A wireless transmit receive unit (WTRU) comprising:
 a processor configured to:   detect, at the WTRU, an in-device interference situation between a first radio access technology (RAT) component and a second RAT component of the WTRU, wherein the second RAT component is a long term evolution (LTE) component;   determine, at the WTRU, one or more frequencies at which at least one of the first or second RAT component is a victim of the in-device interference situation;   send, from the WTRU, a notification of the detected in-device interference situation to an LTE network, wherein the notification comprises information for assisting with the detected in-device interference situation, the information indicating which of the first and/or second RAT component is a victim of the in-device interference situation and indicating the one or more frequencies at which the victim is interfered; and   receive, from the LTE network, an indication of a change in a frequency of operation of the second RAT component based on sending the notification of the detected in-device interference situation.   
     
     
         35 . The WTRU of  claim 34 , wherein the change in the frequency of operation is associated with an inter-frequency handover. 
     
     
         36 . The WTRU of  claim 34 , wherein the change in the frequency of operation is associated with a secondary cell change. 
     
     
         37 . The WTRU of  claim 34 , wherein the processor is further configured to perform at least one of the following in response to receiving the indication from the LTE network: a handover for at least one of the first RAT or second RAT component; a redirection to another frequency; a frequency division multiplexing (FDM) operation; or a frequency division duplex (FDD) half duplex operation. 
     
     
         38 . The WTRU of  claim 34 , wherein the in-device interference situation is detected based on or in response to one or more triggers. 
     
     
         39 . The WTRU of  claim 38 , wherein the one or more triggers comprise at least one of the following: proactive triggers; reactive triggers; a handover being initiated; a change in a mode of operation; a change in a usage scenario change; a change in a service scenario change; an expiration of a timer; a generation of a predetermined load; and a size of a buffer. 
     
     
         40 . The WTRU of  claim 34 , wherein the notification of the detected in-device interference situation comprises at least one of the following: an indication the first RAT or second RAT component needs to be activated or is activated; an indication the first RAT or second RAT component needs to be turned or is turned on; information associated with technology types causing the in-device interference situation; an indication of a capability of the WTRU to handle the in-device interference situation; information associated with the first or second RAT component; usage scenario requested by the first RAT or second RAT component; service scenario requested by the first RAT or second RAT component; information associated with a timer; information associated with a mode of operation of the first RAT or second RAT component; an indication on when the first or second RAT should be turned on; measurements associated with the first RAT or second RAT component; a hopping frequency associated with the first RAT or second RAT component; a list of frequency supported by the first RAT or second RAT component; an indication of an urgency associated with turning on the first RAT or second RAT component; a request for assisted-global navigation satellite system (A-GNSS);
 information associated with a source cell; and information associated with a buffer size of the first RAT or second RAT component.   
     
     
         41 . The WTRU of  claim 34 , wherein the notification of the detected in-device interference situation is sent via a radio resource control (RRC) message. 
     
     
         42 . The WTRU of  claim 34 , wherein the first RAT component supports a first radio technology and the second RAT component supports a second radio technology, and wherein the first and second radio technologies are different. 
     
     
         43 . The WTRU of  claim 34 , wherein the notification of the detected in-device interference situation is sent based on a configuration indicating the WTRU is capable or allowed to send the notification.