Patent ID: 7428228

Claim:
A method of detecting in a user equipment (UE) active channelization codes including channelization codes used by other UEs, which are different from at least one channelization code assigned to the UE, for communicating with a Node B in an assigned time slot, in a Time Division-Code Division Multiple Access (TD-CDMA) system in which each time slot of a radio channel frame is identified by a plurality of code channels, each having a unique channelization code, the method comprising the steps of: (1) forming a channelization code set including a predetermined number of active channelization codes and the set including a number of assigned channelization codes and a number of hypothesis channelization codes to be searched; (2) detecting code channel data using a joint detection corresponding to the channelization codes in the channelization code set from a received signal and measuring code power values of the code channel data corresponding to the channelization codes; (3) comparing the code power values with a predetermined threshold and selecting channelization codes having code power values greater than the predetermined threshold as the active channelization codes; (4) updating the number of active channelization codes and the number of hypothesis channelization codes depending on a detection result and a comparison result; and repeating step ( 1 ) to step ( 4 ) until as many active channelization codes are detected as the predetermined number of active channelization codes.