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3GPPFDD_UL_RACH



Description: 3GPP uplink RACH
Library: 3GPPFDD, User Equipment
Class: SDF3GPPFDD_UL_RACH
Derived From: 3GPPFDD_ULRefCHBase

Parameters

Name

Description

Default

Unit

Type

Range

SpecVersion

version of specifications: Version_03_00, Version_12_00, Version_03_02

Version_12_00

 

enum

 

ScrambleCode

index of scramble code

0

 

int

[0:512] for downlink;
[0:16777215] for uplink

RACHDataPattern

RACH source data pattern: RACH_random, RACH_PN9, RACH_PN15, RACH_bits_repeat, RACH_user_file

RACH_random

 

enum

 

RACHRepBitValue

RACH repeating data value

0xff

 

int

[0:255]

RACHUserFileName

RACH user-defined data file name

datafile.txt

 

filename

 

RACHBlockSize

RACH transport block size: RACH_168, RACH_360

RACH_168

 

enum

 

PrmblSgntr

Preamble Signature

0

 

int

[0:15]

DPDCHGain

DPDCH gain

1.0

 

real

(∞, ∞)

DPCCHGain

DPCCH gain

1.0

 

real

(∞, ∞)

Pin Outputs

Pin

Name

Description

Signal Type

1

out

signal in chips

complex

2

RACH

RACH data out

int

Notes/Equations
  1. This subnetwork model provides the RACH signal source. The actual values of transport channel characteristics are obtained from [2]. The schematic for this subnetwork is shown in the following figure.

    3GPPFDD_UL_RACH Schematic
  2. The transport channel parameters are:

    Transport block size: NRACH =168 or 360 bits
    CRC: 16 bits
    Coding: CC, coding rate = 1/2
    TTI: 20 ms
    Minimum spreading factor: 32

  3. The transport channel coding is illustrated in the following figure.
  4. The DPDCH bit rates are 30 and 60 kbps for transport block size of 168 and 360 bits, respectively. The repeat rate is 56.25% after rate matching.

    UL RACH Channel Coding

References
  1. 3GPP Technical Specification TS 25.944 V3.0.0 "Multiplexing and channel coding (FDD)" Release 1999.
  2. 3GPP Technical Specification TS 25.944 V3.3.0 "Multiplexing and channel coding (FDD)" Release 1999.
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