Method and apparatus for performing inter-frequency and/or inter-radio access technology measurements

Abstract

Techniques for performing inter-frequency and/or inter-radio access technology (RAT) measurements are disclosed. A multi-receiver wireless transmit/receive unit (WTRU) may receive downlink transmissions via a plurality of downlink carriers, of a set of configured downlink carriers, simultaneously. The WTRU may receive gap configuration information for at least one of the set of configured downlink carriers. The WTRU may further perform inter-frequency measurements on carriers outside of the set of configured downlink carriers during a measurement gap in response to the received gap configuration information. The WTRU may further receive information that at least one of the set of configured downlink carriers is to be disabled. The WTRU may then perform measurements on the frequency of the disabled downlink carrier without using measurement gaps. The WTRU may perform measurements on the disabled carrier without measurement gaps maintaining a status of the disabled carrier as disabled at a physical layer.

1 . A wireless transmit/receive unit (WTRU) comprising:
 a processor and a transceiver configured to receive data simultaneously using a plurality of downlink carriers of a set of configured downlink carriers;   the processor and the transceiver further configured to receive gap configuration information for at least one of the set of configured downlink carriers;   the processor and the transceiver further configured to perform inter-frequency measurements on carriers outside of the set of configured downlink carriers during a measurement gap in response to the received gap configuration information;   the processor and the transceiver further configured to receive information that at least one of the set of configured downlink carriers is to be disabled; and   the processor and the transceiver further configured to perform measurements on a frequency of the disabled downlink carrier without using measurement gaps.   
     
     
         2 . The WTRU of  claim 1  wherein the processor and transceiver are further configured to maintain a status of the disabled carrier as disabled at a physical layer. 
     
     
         3 . The WTRU of  claim 1  wherein the measurement gaps are configured on an unpaired downlink carrier and not on a paired downlink carrier. 
     
     
         4 . The WTRU of  claim 1  wherein the processor and transceiver are further configured to determine whether a trigger condition for the inter-frequency measurements is met, and perform the inter-frequency measurements on a condition that the trigger condition is met. 
     
     
         5 . The WTRU of  claim 1  wherein the processor and transceiver are further configured to determine whether a trigger condition for performing measurements on a frequency of the disabled downlink carrier without using measurement gaps is met, and perform the measurements on a frequency of the disabled downlink carrier without using measurement gaps on a condition that the trigger condition is met. 
     
     
         6 . The WTRU of  claim 1  wherein the processor and transceiver are further configured to detect a home Node-B (HNB) cell or a home evolved HNB (eHNB) cell, transmit a proximity indication on a condition that an identity of the detected HNB or eHNB cell is in a list that the WTRU received from a network, and perform the inter-frequency measurements on a frequency carrier of the detected HNB or eHNB cell. 
     
     
         7 . The WTRU of  claim 1  wherein the processor and transceiver are further configured to transmit an indication to a network of a capability of the WTRU to perform inter-frequency measurements on carriers outside of the set of configured downlink carriers during a measurement gap. 
     
     
         8 . The WTRU of  claim 1  wherein the processor and transceiver are further configured to transmit an indication to a network of a capability of the WTRU to perform measurements on the frequency of the disabled downlink carrier without using measurement gaps. 
     
     
         9 . A method implemented in a wireless transmit/receive unit (WTRU) for performing inter-frequency measurements, the method comprising:
 receiving data simultaneously using a plurality of downlink carriers of a set of configured downlink carriers;   receiving gap configuration information for at least one of the set of configured downlink carriers;   performing inter-frequency measurements on carriers outside of the set of configured downlink carriers during a measurement gap in response to the received gap configuration information;   receiving information that at least one of the set of configured downlink carriers is to be disabled; and   performing measurements on a frequency of the disabled downlink carrier without using measurement gaps.   
     
     
         10 . The method of  claim 9  further comprising:
 maintaining a status of the disabled carrier as disabled at a physical layer. 
 
     
     
         11 . The method of  claim 9  wherein the measurement gaps are configured on an unpaired downlink carrier and not on a paired downlink carrier. 
     
     
         12 . The method of  claim 9  further comprising:
 determining whether a trigger condition for the inter-frequency measurements is met, and performing the inter-frequency measurements on a condition that the trigger condition is met. 
 
     
     
         13 . The method of  claim 9  further comprising:
 determining whether a trigger condition for performing measurements on a frequency of the disabled downlink carrier without using measurement gaps is met, and performing the measurements on a frequency of the disabled downlink carrier without using measurement gaps on a condition that the trigger condition is met. 
 
     
     
         14 . The method of  claim 9  further comprising:
 detecting a home Node-B (HNB) cell or a home evolved HNB (eHNB) cell; 
 transmitting a proximity indication on a condition that an identity of the detected HNB or eHNB cell is in a list that the WTRU received from a network; and 
 performing the inter-frequency measurements on a frequency carrier of the detected HNB or eHNB cell. 
 
     
     
         15 . The method of  claim 9  further comprising:
 transmitting an indication to a network of a capability of the WTRU to perform inter-frequency measurements on carriers outside of the set of configured downlink carriers during a measurement gap. 
 
     
     
         16 . The method of  claim 9  further comprising:
 transmitting an indication to a network of a capability of the WTRU to perform measurements on the frequency of the disabled downlink carrier without using measurement gaps.