Wireless Oom

RL (Radio Link)
represents
the physical connection between the UE and Node B.
Each RL is defined by its RF frequency, channelization code and scrambling code.

The spreading procedure in the UTRAN consists of two separate operations:
1. channelization
2. scrambling
Channelization uses orthogonal codes. Scrambling uses PN (Pseudo-Noise) codes.
Downlink:
channelization is for differentiating users.
scrambling is for differentiating base station.
Uplink:
channelization is for differentiating channels per UE
scrambling is for differentiating users.
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Orthogonality requires time synchronous properties. Thus, it cannot separate different uplink users as all UEs are [...]