WCDMA3G_TFCIDemap
Description: TFCI demapping
Library: 3GPPFDD 10-99, Channel Coding
Class: SDFWCDMA3G_TFCIDemap
Parameters
Name |
Description |
Default |
Sym |
Type |
Range |
|---|---|---|---|---|---|
ServNum |
service number |
1 |
NS |
int |
[1, ∞) |
Pin Inputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
1 |
TFMaxIn |
input maximum transport format |
int |
2 |
TFCI |
input TFCI |
int |
Pin Outputs
Pin |
Name |
Description |
Signal Type |
|---|---|---|---|
3 |
TFMax |
output maximum transport format |
int |
4 |
TF |
output transport format |
multiple int |
Notes/Equations
- This model is used to implement transport format combination indicator (TFCI) demapping in the receiving side. Each firing, NS tokens of TF and NS tokens of TFMax are produced when NS tokens of TFMaxIn and one ~~ token of TFCI are consumed. The default value for ServNum is 1.
- Model functions
TFMaxIn and TFCI information is read from the input buffer.
The TFCI demapping rule in the receiving side is as follows.
If several variable-rate services S1, S2, ..., Sk are included within one CCTrCH (code composite transport channel), each service Si has a set of possible transport format combination indicators TFi,1, TFi,2, ..., TFi,Li:
This gives L=L1 xL2 x...xLk service rate combinations, therefore L must be ≤1024 since the maximum TFCIBitsNum is 10.S1: TF1,1, TF1,2, ..., TF1,L1
S2: TF2,1, TF2,2, ..., TF2,L2
.
.
.
Sk: TFk,1, TFk,2, ..., TFk,Lk
Given a certain service rate combination number (TFCI value m) the current TF of these services can be derived as follows:
for j=K to 1 step -1
where the service rate combinations SRCj corresponds to one of TFj s and shall be the integer from 0 to Lj -1.SRCj = m MOD Lj
m = m DIV Lj
end
TFMax values are set as the values of read TFMaxIn.
Multiple TF and TFMax are read into the output buffer.
References
- 3GPP Technical Specification TS25.302 V3.1.0,"Services provided by the Physical Layer," October 1999.
- 3GPP Technical Specification TS25.212 V3.0.0,"Multiplexing and Channel Coding (FDD)," October 1999.
- ETRI, "TSGR1#5(99)582 TFCI mapping rule in the transmitting side," June 1999.