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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
  1. 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.
  2. 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:

    S1: TF1,1, TF1,2, ..., TF1,L1
    S2: TF2,1, TF2,2, ..., TF2,L2
    .
    .
    .
    Sk: TFk,1, TFk,2, ..., TFk,Lk

    This gives L=L1 xL2 x...xLk service rate combinations, therefore L must be ≤1024 since the maximum TFCIBitsNum is 10.
    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

    SRCj = m MOD Lj
    m = m DIV Lj
    end

    where the service rate combinations SRCj corresponds to one of TFj s and shall be the integer from 0 to Lj -1.
    TFMax values are set as the values of read TFMaxIn.
    Multiple TF and TFMax are read into the output buffer.

References
  1. 3GPP Technical Specification TS25.302 V3.1.0,"Services provided by the Physical Layer," October 1999.
  2. 3GPP Technical Specification TS25.212 V3.0.0,"Multiplexing and Channel Coding (FDD)," October 1999.
  3. ETRI, "TSGR1#5(99)582 TFCI mapping rule in the transmitting side," June 1999.
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