Page tree
Skip to end of metadata
Go to start of metadata


3GPPFDD_ULRateMatch

Description: Uplink Rate Matching
Library: 3GPPFDD, TrCH Multiplexers & Coders
Class: SDF3GPPFDD_ULRateMatch
Derived From: 3GPPFDD_ULCCTrCHBase

Parameters

Name

Description

Default

Unit

Type

Range

SpecVersion

version of specifications: Version_03_00, Version_12_00, Version_03_02

Version_12_00

 

enum

 

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

TrCHType

transport channel type: RACH_Type, DCH_Type

DCH_Type

 

enum

 

PuncLimit

puncturing limit for uplink

0.8

 

real

(0.0:1]

MinSF

minimum spreading factor: SF_256, SF_128, SF_64, SF_32, SF_16, SF_8, SF_4

SF_4

 

enum

 

Pin Inputs

Pin

Name

Description

Signal Type

1

SizeIn

input size

int

2

DataIn

input data

int

3

TFCIin

TFCI input

int

Pin Outputs

Pin

Name

Description

Signal Type

4

SizeOut

output size

int

5

DataOut

output data

int

6

Index

transport channel index

int

Notes/Equations
  1. This model is used to implement uplink rate matching. Rate matching means that bits on a transport channel are repeated or punctured.
    Higher layers assign a rate-matching attribute for each transport channel. This attribute is semi-static and can only be changed through higher layer signalling. The rate-matching attribute is used when the number of bits to be repeated or punctured is calculated. The RMArray parameter is provided so designers can set the semi-static attributes for each transport channel.
    The number of bits on a transport channel can vary between different transmission time intervals. When the number of bits between different transmission time intervals in uplink is changed, bits are repeated or punctured to ensure that the total bit rate after TrCH multiplexing is identical to the total channel bit rate of the allocated dedicated physical channels.
    Refer to [1] for details of rate matching algorithm.
  2. This model fires once per radio frame. Each firing, one token is consumed by pin SizeIn; this token indicates the effective length of data block input at pin DataIn. One token at pin TFCIin indicates the current transport format combination. After rate matching, the data block is output at pin DataOut; a token will be generated by pin SizeOut to indicate the effective length of the output data block. A token will be generated by pin Index to indicate transport channel index.
  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.
    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
  4. The PuncLimit parameter denotes the variable PL defined in [1]. Refer to [1] for details regarding this variable in rate matching algorithm.
  5. Parameter TrCHIndex indicates the index of current transport channel, its value range is from 1 to the value of parameter TrCHNum.
  6. The length of most parameters in the form of arrays is equal to the value of parameter TrCHNum, each element of an array represents a certain transport channel. The only exception is DynTFSetArray, the length of this array is variable and provides all possible transport block size and transport block set size for each transport channel.
    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.
  7. The following core algorithm rate matching formulas are defined in [1].

    Z 0 = 0

    Δ Nij = Zij - Zi -1,j - Nij

    Example (12.2 kbps uplink reference measurement channel defined in [2])

    DTCH: N 1,0 = 402 RM 1 = 1.0
    DCCH: N 2,0 = 90 RM 2 = 1.0

    In this case, uplink rate matching algorithm will auto select a slot format 2.
    SlotFormat=2 => Ndata,0 = 40 × 15 = 600 bits
    Results of above formulas are:

    Z 1 = 490
    Δ N 1,0 = 88
    Z 2 = 600
    Δ N 2,0 = 20

    The bits number of DTCH in a physical frame can be calculated by Z 1- Z 0=490, and that number of DCCH can be calculated by Z 2- Z 1=110. There is also another method of calculation: N 1.0 + Δ N 1.0 = 490 and N 2.0 +Δ N 2.0 = 110.

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

  2. 3GPP Technical Specification TS 25.101 V3.10.0, UE Radio transmission and reception (FDD), March 2003, Release 1999.

    http://www.3gpp.org/ftp/Specs/2002-03/R1999/25_series/25101-3a0.zip

  3. TSGR1#6 (99)849, "Rate matching signalling"
  • No labels