What is the difference between scrambling codes and channelization codes ? and which code is used for cell planning ?

Scrambling code is used to make differntiation for cells and Channalization code is used to make differentiation of service between MS in the same physical channel.

Channelization Codes: UL :to Separate Physical n control data from same terminalDL:To separate connection to diff terminals in same cellScrambling Codes:UL: Separate diff usersDL: Separate Diff Node Bs.