Method and apparatus for cell reselection

Abstract

A method and wireless transmit receive unit (WTRU) are disclosed that is configured to perform cell reselection to another cell when the WTRU is in a CELL_FACH state using an Enhanced-Dedicated Channel (E-DCH). The cell reselection is based on internal measurements by the WTRU. Alternatively, the cell reselection can be WTRU based on the WTRU measurements reported to the network.

What is claimed is: 
     
         1 . A method for cell reselection associated with a wireless transmit receive unit (WTRU), the method comprising:
 determining that a network is controlling cell reselection for the WTRU;   performing a measurement of a channel; and   sending a measurement report to the network.   
     
     
         2 . The method of  claim 1 , further comprising determining a triggering criteria for performing the measurement of the channel, wherein the measurement is performed when the triggering criteria is met. 
     
     
         3 . The method of  claim 2 , further comprising receiving the triggering criteria from the network. 
     
     
         4 . The method of  claim 1 , further comprising receiving an indication from the network that the network is controlling cell reselection for the WTRU. 
     
     
         5 . The method of  claim 1 , wherein the measurement report is associated with the measurement of the channel. 
     
     
         6 . A wireless transmit/receive unit (WTRU) comprising:
 a processor configured to:   determine that a network is controlling cell reselection for the WTRU;   perform a measurement of a channel; and   send a measurement report to the network.   
     
     
         7 . The method of  claim 6 , further comprising determining a triggering criteria for performing the measurement of the channel, wherein the measurement is performed when the triggering criteria is met. 
     
     
         8 . The method of  claim 7 , further comprising receiving the triggering criteria from the network. 
     
     
         9 . The method of  claim 6 , further comprising receiving an indication from the network that the network is controlling cell reselection for the WTRU. 
     
     
         10 . The method of  claim 6 , wherein the measurement report is associated with the measurement of the channel.