Wcdma Rnp Link Budget

WCDMA RNP Link Budget

WCDMA RNP Link Budget July 11, 2016

Link Budget in WCDMA

The link budget is used to calculat   path loss to maintain a link between t  and the receiver on a specifc spec ifc environ corresponding cell range can be deriv  loss with a propagation model.

Link Budget in WCDMA

The link budget is used to calculat   path loss to maintain a link between t  and the receiver on a specifc spec ifc environ corresponding cell range can be deriv  loss with a propagation model.

Contents

Introduction Parameters Example

of Link Budget

of Link Budget

Introduction

Link Budget  Forward ―

link :

Difficult to ae! de"end on t#e cell edge le$el of inte%fe%ence on t#e location of t#e &o'ile

 Reverse

link:

―

(ay to ae

―

La%gely ued in RND ) RN*

Introduction

Interference ―

WCDMA i int%inically +nte%fe%ence li&ited yte&

―

Co$e%age and ca"acity de"end on t#e inte%fe%ence e"e%i&ented 'y t#e %ecei$e% 

Introduction

Interference on the Forward link  Primary

source of interference: typically power broadcasted by surrounding cells

 econdary

source of Interference: ot!er links in t!e same cell serving ot!er "E

Introduction

Interference on the Reverse link  Primary

source of interference: ot!er "E in t!e same cell

 econdary

source of Interference: ot!er "E outside t!e cell# $!ese "E are not under t!e power control of t!e cell#

Introduction

 Interference

―

reduction during RNP

c%itical

―  Need

of t#o%oug# guideline in o%de% to!

- Reduce co.c#annel inte%fe%ence - Reduce ad/acent f%euencie inte%fe%ence  % own network  % &etwork of 'ompetitors

Contents

Introduction Parameters Example

of Link Budget

of Link Budget

Link Budget Parameters  (nalysis

cenarios

 )aximum  'able

$ransmission Power of *'+

Loss , Body Loss

 (ntenna

-ain

 EIRP.E/uivalent  &oise

isotropic Radiation Power0

Figure

 Re/uired

Eb1&o

 ensitivity

of receiver 

Link Budget Parameters  Interference  )argin  Fast

margin

of Background &oise

Fading )argin

 )inimum

Re/uired ignal trengt!

 Penetration Loss  slow

Fading )argin

 oft +andover -ain 

Propagation )odel

Analysis Scenarios  )orp!ology

―

ene%ally, t#e%e a%e  ty"e of "lanning a%ea! - Dene 3%'an - 3%'an - 4u'u%'an - Ru%al A%ea - 5ig#ay

―

7#e ty"e of a%ea i&"act! - Mean "enet%ation lo - 4tanda%d de$iation of lo fading - P%o"agation Model 8 t#e facto% of "at# lo

Analysis Scenarios  )orp!ology

―

.'ont#0

9a%iou "lanning t%ategie a%e a""lied acco%ding to t#e ty"e of a%ea: +t i necea%y to configu%e folloing "a%a&ete%! - C#annel &odel - 4ecto%i;ation - +ndoo% co$e%age - 7a%get e%$ice

= ≈ :2

%oise &igure  B ―

.'ont#0 +n t#e cae of it# 7MA and >dB fo% ca'le lo,

NF

Gain

!.#dB

2.!dB

XdB

Jumper beore TMA

TMA

Cable

-!.#dB

"2dB

-XdB

NF at this port is Channel Gain related$ %ee Table Belo&

NodeB

i&ila%ly t#e noie figu%e can 'e calculated a follo!

 !"  =  !"  #umer  +

 !" TMA − 1 G #umer 

+

 !" Cable − 1 G #umer  ⋅ GTMA

+

 !" CabinetTo −1 G #umer  ⋅ GTMA ⋅ GCable

 Note! t#e NCa'inet7o" i a $a%ia'le "a%a&ete% 'ecaue of gain ad/ut&ent to co&"enate gain $a%iance and &aintain a contant R c#annel gain:

$e'uired #!%o  &eeded

by t!e user service to maintain t!e link wit! acceptable /uality#

 Cutput

from Link8level imulation according to t!e following factors: ―

C#annel ty"e

―

Mo'ile "eed

―

o4

―

Recei$e% i&"le&entation

Sensiti(ity of t)e $ecei(er  )inimum

signal power on t!e cable connector of antenna needed by t!e receiver to demodulate signal wit! specific BER or BLER target# ―

+n t#e Link Budget, t#e eniti$ity of %ecei$e% i dete%&ined 'y  "e%fo%&ance of B4 o% 3( itelf and %eui%ed (')No: - Di$e%ity, e%$ice and c#annel.%elated i&"act on t#e eniti$ity of %ecei$e% a%e included in t#e %ele$ant %eui%ed (')No

&  = log 10