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3GPPFDD_DLFirDTXInser



Description: First insertion of DTX indication bits
Library: 3GPPFDD, TrCH Multiplexers & Coders
Class: SDF3GPPFDD_DLFirDTXInser
Derived From: 3GPPFDD_DLCCTrCHBase

Parameters

Name

Description

Default

Unit

Type

Range

SpecVersion

version of specifications: Version_03_00, Version_12_00, Version_03_02

Version_12_00

 

enum

 

SlotFormat

slot format

0

 

int

TrCHNum

number of Transport Channels

1

 

int

[1:32]

TrCHIndex

index of Transport Channel

1

 

int

[1:TrCHNum]

RMArray

rate matching attributes of all Transport Channels

1.0

 

real array

(0.0:1.0] if SpecVersion=Version_03_00;
[1:256] if SpecVersion=others;
array size shall be equal to TrCHNum

DynTFSetArray

dynamic part of TF set of all Transport Channels

244 976

 

int array

range is the same as DynTFSet in 3GPPFDD_CRCEncoder

TFSetSizeArray

Transport Format set size of all Transport Channels

1

 

int array

[1, inf) for each element;
sum of the elements shall be equal to the number of pairs in DynTFSetArray;
array size shall be equal to TrCHNum

TTIArray

Transmission Time Interval of all Transport Channels

0

 

int array

[0,1,2,3] for each element;
array size shall be equal to TrCHNum

CRCArray

number of CRC bits of all Transport Channels

3

 

int array

[0,1,2,3,4] for each element;
array size shall be equal to TrCHNum

CHCodingTypeArray

channel coding type of all Transport Channels

1

 

int array

[0,1,2] for each element;
array size shall be equal to TrCHNum

PhyCHNum

downlink physical channel number

1

 

int

[1:8]

TrCHMulPos

Transport Channel multiplex position in CCTrCH: Fixed, Flexible

Fixed

 

enum

 

TrCHType

transport channel type: DCH_Type, BCH_Type, PCH_FACH_Type

DCH_Type

 

enum

 

† [0:5] for uplink DPCCH;
[0:16] for downlink DPCH;
[0:17] for downlink SCCPCH;
[0:5] for uplink PCPCH (Ver 03_00);
[0:2] for uplink PCPCH (Ver 12_00);
[0:1] for uplink PCPCH (Ver 03_02).

Pin Inputs

Pin

Name

Description

Signal Type

1

SizeIn

input size

int

2

DataIn

input data

int

Pin Outputs

Pin

Name

Description

Signal Type

3

SizeOut

output size

int

4

DataOut

output data

int

Notes/Equations
  1. This model is used to implement first DTX insertion. This step of inserting DTX indication bits is used only if the positions of the TrCHs in the radio frame are fixed. With fixed position scheme a fixed number of bits is reserved for each TrCH in the radio frame.
    The bits from rate matching are denoted by gi 1, gi 2, gi 3, ... , giGi where Gi is the number of bits in one TTI of TrCH i. Denote the number of bits in one radio frame of TrCH i by Hi. Denote Di the number of bits output of the first DTX insertion block.
    In normal or compressed mode by spreading factor reduction, Hi is constant and corresponds to the maximum number of bits from TrCH __ i in one radio frame for any transport format of TrCH i . and Di = Fi  ×  Hi.
    In compressed mode by puncturing, additional puncturing is performed in the rate matching block. The empty positions resulting from the additional puncturing are used to insert p-bits in the first interleaving block, the DTX insertion is therefore limited to allow for later insertion of p-bits. DTX bits are inserted until the total number of bits is Di where Di = Fi  ×  Hi ,+ Δ N TTIcm, i, max, and Hi = Ni+ Δ Ni.
    The bits output from the DTX insertion are denoted by hi 1, hi 2, hi 3, ... , hiDi. Note that these bits are triple valued. These are defined by the following relations:

    hik = gik k = 1, 2, 3, ... , Gi
    hik = δ k = Gi + 1, Gi + 2, Gi + 3, ... , Di

    where DTX indication bits are denoted by  δ. Here gik  Œ{0, 1} and δ œ{0, 1}.
  2. This model fires once per TTI. Each firing, one token is consumed by pin SizeIn, this token indicates the effective length of data block input at pin DataIn. Then this model will insert DTX bits into data block if necessary, and the data block is output at pin DataOut. A token is generated by pin SizeOut to indicate the effective length of the output data block.
  3. All transport channel information must be in the form of arrays.
    The DynTFSetArray parameter requires an integer array. The correct format is transport block size 1, transport block set size 1, transport block size 2, transport block set size 2 , etc. The size of this array must be a multiple of 2, and the transport block set size must be a multiple of the relative transport block size.
    TFSetSizeArray indicates how many pairs of transport block and transport block set sizes are contained in a certain transport channel. For example:
    • TFSetSizeArray = "3 2" means the first three pairs of transport block size and transport block set size belong to the first transport channel, and the next two pairs belong to the second transport channel.
    • TFSetSizeArray = "2 2 2" means the first two pairs of transport block size and transport block set size belong to the first transport channel, the next two pairs belong to the second transport channel and the last two pairs belong to the third transport channel.
    When setting TTIArray, CRCArray and CHCodingTypeArray values, refer to the following table.
    Settings for TTIArray, CRCArray and CHCodingTypeArray Values
    TTIArray CRCArray CHCodingTypeArray
    Time Value Coding Value Coding Value
    10 msec 0 No CRC 0 No Coding 0
    20 msec 1 8 bits 1 1/2 CC 1
    40 msec 2 12 bits 2 1/3 CC 2
    80 msec 3 16 bits 3 1/3 TC 3
        24 bits 4    
    CC = convolutional coding; TC = turbo coding

References
  1. 3GPP Technical Specification TS 25.212 V3.9.0, Multiplexing and Channel Coding (FDD) 2002-03, Release 1999.

    http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25212-390.zip

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