Apparatus and method for downlink channelization code allocation in UMTS

摘要

Disclosed is a method for assigning orthogonal codes for channelization for data transmission by a radio network controller of a mobile communication system having an orthogonal code tree structure in which each of multiple upper codes having orthogonality between the upper codes is branched out into multiple lower codes which do not have orthogonality with respect to the upper codes, which comprising the steps of: a) confirming whether or not the lower codes derived from one upper code have different available states; and b) reassigning the orthogonal codes for the data transmission so that the lower codes derived from one upper code have same available states, when there exist two or more lower codes having the different available states as a result of the confirmation.