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SMIQ
Digital Standard 3GPP W-CDMA (FDD)
1125.5555.03
E-9
2.175
Slot and frame builder
The bits from the data source are first entered into a frame structure. The frames are made up of two
hierarchical levels:
Table 2-22 Hierarchical structure of 3GPP W-CDMA frames
Hierarchy
Length in ms
Remarks
Time slot
0.667
Radio frame
10
After a radio frame, pilot symbols are repeated. A radio
frame consists of 15 time slots. This is also the length of a
scrambling code cycle. Frames are the basic unit in the SMIQ.
The sequence length is stated in radio frames.
The configuration of the time slots depends on the channel type and symbol rate.
The following components are distinguished:
•
Pilot sequence
The pilot sequence characterizes the time slot position within the radio frame and also depends on
the symbol rate, transmit diversity and the pilot length parameter.
Channel types DPCH, S-CCPCH, DL-DPCCH, DPCCH, PRACH and PCPCH have a pilot
sequence.
The pilot sequence cannot be changed by the user.
•
Synchronization code symbol
The synchronization code symbol is the only symbol of the SCH.
It is fixed to “11“.
•
TPC symbol
This symbol is used to control the transmit power. It is used in DPCH, DL-DPCCH and DPCCH.
A bit pattern for the sequence of TPC symbols can be indicated as a channel-specific pattern.
•
Data symbols
These symbols carry the user information and are fed from the data source. They are used in
DPCH, P-CCPCH, S-CCPCH,PDSCH, DL-DPCCH, DPDCH, PRACH and PCPCH.
•
Signature
The signature is used in PRACH and PCPCH. 16 fix bit patterns are defined of which the user may
select one.
•
TFCI
The “Transport Format Combination Indicator“ is used in DPCH/DPCCH if the corresponding button
of the interface (Base Station Configuration, see section 2.14.2.5/ Mobile Station Configuration, see
section 2.14.2.6) is activated. In this case, a code sequence with the length of 30 is defined using
this value and distributed among 15 subsequent time slots. In PRACH and PCPCH, the TFCI field is
provided as standard.
•
FBI
Feedback indication bits are only used in DPCCH and PCPCH.