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channelization and scrambling

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could anyone please explain the difference between channelization and scrambling code in WCDMA

Thanks in advance,
 

As the name indicates, channelization code is used to distinguish channels (each by a CDMA code). Roughly speaking, it distinguish users.

Scarable code is ususally used to distinguish different sectors or basestations and it is impleneted on top of channelization codes.
 

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Thank you for your reply but there is a problem in this,
actually in uplink different users at BS are separated by scrambling code and in downlink different users are separated by channelization code.

why is this difference ..

Regards,
 

in downlink , channelisation codes are used to distinguish different channels from same basestation ,while scrambling codes distinguish different basestations


in uplink , scrambling codes distinguish different users (mobiles) while channelization codes distinguish different channels from same mobile (like video call , data , and control at the same time from same mobile station )
 
Dear changfa and Ahmed_Nasr,

Thank you very much for your explainations.

Regards,
 

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