WCDMA Signaling
R&S
®
CMW-KG4xx/-KM4xx/-KS4xx
38
User Manual 1173.9657.02 ─ 11
Fig. 2-7: Channelization, scrambling, weighting and combining of downlink channels
2.2.10.2
UE Synchronization and Scrambling Code Identification
With the channels of the generated DL signal, synchronization of the UE and scram-
bling code identification is a three-step process:
1. Slot synchronization
The UE searches for the P-SCH and detects the primary synchronization code
using correlation methods. The start of the P-SCH marks the beginning of a slot.
2. Frame synchronization and scrambling code group identification
The UE detects the secondary synchronization code transmitted on the S-SCH to
obtain the frame time and the scrambling code group. If needed, it also determines
the System Frame Number (SFN) transmitted on the P-CCPCH.
3. Scrambling code identification and data evaluation
The UE detects the P-CPICH to determine the primary scrambling code within the
scrambling code group obtained in step 2. Using this information, it is possible to
detect the scrambling code of the DPCH and to decode the data.
2.2.10.3
Scrambling Codes
Scrambling codes are defined in 3GPP TS 25.213. They are used in uplink and down-
link.
General Description
深圳德标仪器
135-1095-0799
