capacity management

6/ 038 13 - EN/LZU 108 6402 . Figure 6 - WCDMA Radio Network Functionality and Configuration – Capacity Management1

1. WCDMA Radio Network Solution

2. WCDMA Radio Access Bearers

3. WCDMA Idle Mode Behaviour

4. WCDMA Radio Connection Supervision

5. WCDMA Power Control

6. WCDMA Capacity Management

7. WCDMA Handover

8. WCDMA Channel Switching

1. WCDMA Radio Network Solution

2. WCDMA Radio Access Bearers

3. WCDMA Idle Mode Behaviour

4. WCDMA Radio Connection Supervision

5. WCDMA Power Control

6. WCDMA Capacity Management

7. WCDMA Handover

8. WCDMA Channel Switching

6. Capacity Management

WCDMA Radio Network Functionalityand Configuration


Objectives

Upon completion of this chapter the student will be able to:

• Explain the purpose of the capacity management algorithm(s)

• Explain the interaction between the dedicated resource monitors and the different algorithms

• Describe the dedicated resources

• Describe admission control

• Describe congestion control


Measurements

AdmissionControl

CongestionControl

Dedicated Monitored Resources Handling

1- Event-based

2- Periodic

Interaction Between the Capacity Management Functions


Capacity Management Overview

SRNC

TxCPwr

Dedicated Monitored Resources

ASEMonitor

DL PowerMonitor

HistogramMonitor

CongestionControl

AdmissionControl

DL CodeAllocation

Soft/Softerhandover

RABestablishment

& release

ChannelSwitching

SignallingConnection

Handling

Compressedmode

CRNC RBS

IRAT/Interfhandover

RSSI


DL_PWR_MEAS_REPORT

AdmissionControl

ASEMonitor

ADMISSION REQUEST

Filtermeasurement

REPORT_PWR

1

REPORT_RESOURCE_INCREASE

Testadmission

Updateload

Updateload

DL_PWR_INCREASE

RESOURCE_INCREASE

REPORT_PWR

3

HistogramMonitor (SF&CM)

ChannelizationCode

2

ADMISSION RESPONSE

4

5

Updateload

Updateload

678

SystemFunction

DL PowerMonitor

Interaction Between Monitored Resources and Admission Control


Dedicated Monitored Resources

• Downlink transmitted carrier power

• Air-interface Speech Equivalent (ASE) usage in DL and UL

• Histogram monitor (DL spreading factor usage and number of compressed mode radio links)

• Downlink channelization codes

• Uplink Received Total Wideband Power (RTWP)


DLTransmit Carrier Power Estimation per Radio Link

Pestimate rl = F • Pmax rl (W)

Pestimate rl is the estimation of the downlink transmitted carrier power for the new connection

F is a power scaling factor that is connected to the activityfactor and also distance-dependent

Pmax rl is the maximum DL transmitted code power (in W) allowed for the radio

link.


Table 6-1 F factor

Radio Connection Type F

SRB 0.3

Speech 12.2 0.15

CS 57.6 0.21

CS 64 0.3

PS 16/64 (streaming) 0.24

PS 64/64 0.21

PS 64/128 0.21

PS 64/384 0.18

Multi-RAB (speech + PS 64) 0.21


Table 6.2 Max DCH Rate (bps) per Radio Connection Type

Radio Connection Type Maximum DCH rate

SRB 14800

Speech 12.2 15900

CS 57.6 61300

CS 64 67700

PS 16/64 (streaming) 77700

PS 64/64 70900

PS 64/128 138100

PS 64/384 406900

Multi-RAB (speech + PS 64) 83100


Table 6-3 Pmax rl (dB) per Radio Connection Type

Radio Connection Type Pmax rl (dB) relative CPICH Power

SRB 0

Speech 12.2 0

CS 57.6 2.8

CS 64 3.2

PS 16/64 (streaming)

PS 64/64 3.4

PS 64/128 4

PS 64/384 4.8

Multi-RAB (speech + PS 64) 3.8

3.8


Table 6-4 Pestimate rl per Radio Connection Type

Radio Connection Type Pestimate rl (relative CPICH)

SRB -5.20

Speech 12.2

CS 57.6 -4.00

CS 64 -2.00


PS 64/64 -3.40

PS 64/128 -2.80

PS 64/384 -2.60

Multi-RAB (speech + PS 64) -3.00

-8.2

-2.40


HSDPA Power Usage

Will take whatever power that is left in RBS after common channels and dedicated channels has taken their part

HSDPA

Common channels (not power controlled)

Dedicated channels (power controlled)T

ota

l av

aila

ble

cel

l p

ow

er


HSDPA – NBAP: Common Power measurements

All excess power used by HSDPA– Existing P3 implementation considers the cell as always having a highly

loaded downlink.

Adapt power measurements to the HSDPA capability of a cell:– HSDPA capable: Measure TX power of all codes not used for HS-PDSCH

or HS-SCCH

– HSDPA not capable: Measure TX power for all codes


Table 6-5 Activity Factors per Radio Connection Type

Radio Connection Type Activity Factor (AF)

SRB

Speech 12.2

CS 57.6 0.7

CS 64


PS 64/64

PS 64/128

PS 64/384

Multi-RAB (speech + PS 64)

0.5

1

0.7

0.7

0.6

0.7

1

0.8


Air Interface Speech Equivalent (ASE) Usage

speech)factor (activity

link) radiofactor (activity

speech)link radio (maxrate

link) radio (maxrateASE


Table 6.6 Default ASE values

Radio Connection Type

CS 64

MultiRAB (speech + PS 64)


SRB

Speech 12.2

CS 57.5

PS 64/384

PS 64/128

PS 64/64

Uplink ASEs

11.10

9.32

4.74

2.43

1.61

7.22

8.32

8.32

8.32

Downlink ASEs

11.10

9.32

10.59

2.43

1.61

7.22

40.27

16.03

8.32


Calculation of Code Tree Usage

Σ 1/SF(user) + Σ 1/SF(CCH)


HSDPA Code Control

Enable for operator to set the number of HS-PDSCH codes for a cell.

– Maximum 5 codes for HS-PDSCH (SF=16)

– The number of HS-SCCH (SF=128) codes hard coded to one

Parameter: numOfHspdschCodes– Increasing: Lock cell, release traffic

– Decrease: No effect on ongoing traffic


Admission Control Workflow

Resource request Is admission blocked by Congestion Control?Is admission blocked

by Congestion Control?

Yes, then block

Check if the requestedASE UL + estimated ASE UL

>aseUlAdm

Check if the requestedASE UL + estimated ASE UL

>aseUlAdm

No

Yes, then block

Check if the requestedDL Pwr + estimated Pwr

>pwrAdm

Check if the requestedDL Pwr + estimated Pwr

>pwrAdm

No

Yes, then block

Check if the requested + estimated # compressed mode RL

> compModeAdm

Check if the requested + estimated # compressed mode RL

> compModeAdm

No

Yes, then block

No, then accept

Check if the requestedASE DL + estimated DL ASE

>aseDlAdm

Check if the requestedASE DL + estimated DL ASE

>aseDlAdm

No

Yes, then block

Yes, then block

Check if the requestedcode usage + estimated code usage

>dLCodeAdm

Check if the requestedcode usage + estimated code usage

>dLCodeAdm

No

No

Yes, then block

Check if the requestedDL SF + estimated DL SF

>sfXAdm *

Check if the requestedDL SF + estimated DL SF

>sfXAdm *

Only checked if BE-service requests

* X = 8 or X = 32 or X=16


Admission Control – HSDPA

Measure number of users allocated to HS-PDSCH / HS-SCCH

Applies to admission requests in the cell

Parameter: hsdpaUsersAdm

# users on HS-PDSCH / HS-SCCH

Only serving cellchange of HSDPAadmitted

Request forHSDPA resourcesalways admitted

hsdpaUsersAdm


Admission Control – HSDPA DL Power

PowerA

dmis

sion

Gra

nted

Rej

ect /

Sof

t Con

g.

Adm

issi

on G

rant

edR

ejec

t /S

oft C

ong.

Adm

issi

on G

rant

edRej

ect/

Sof

t Con

g.A

dmis

sion

Gra

nted

non-

guar

ante

ed /

non-

hand

over

non-

guar

ante

ed /

hand

over

guar

ante

ed /

non-

hand

over

guar

ante

ed /

hand

over

Adm

issi

on G

rant

edgu

aran

teed

-hs

/ non

-han

dove

r

Adm

issi

on G

rant

edgu

aran

teed

-hs

/ han

dove

r

Congestion threshold

Handover thresholdpwrAdm

Non-guaranteed threshold pwrAdm-BeMarginDlPwr

Guaranteed threshold

pwrAdm + pwrAdmOffsetRej

ect /

Sof

t Co.

Rej

ect /

Sof

t Co.

Rej

ect /

Sof

t Co.


Soft Congestion Mechanism

New request for ng 64/128, ng 64/64 or g accessNew request for ng 64/128, ng 64/64 or g access

Admission Control blocks the new requestAdmission Control blocks the new request

An existing ng user of 64/384 will be switched down to 64/128 or an existing ng user of 64/128 will be switched down to 64/64An existing ng user of 64/384 will be switched down to 64/128

or an existing ng user of 64/128 will be switched down to 64/64


Admission Control – HSDPA UL ASE

ASE UplinkUsage

Adm

issi

on G

rant

edR

ejec

t.

Adm

issi

on G

rant

edR

ejec

t.

Adm

issi

on G

rant

ed

Rej

ect.

Adm

issi

onG

rant

edno

n-gu

aran

teed

/no

n-ha

ndov

er

non-

guar

ante

ed /

hand

over

guar

ante

ed /

non-

hand

over

guar

ante

ed-h

s / n

on-h

ando

ver

Adm

issi

on G

rant

edgu

aran

teed

/ ha

ndov

er

Adm

issi

on G

rant

edgu

aran

teed

-hs

/ han

dove

r


Handover thresholdaseUlAdm

Non-guaranteed threshold aseUlAdm-BeMarginAseUl


aseUlAdm+ aseUlAdmOffsetRej

ect.

Rej

ect.

Rej

ect.


Admission Control – HSDPA DL ASE

ASE DownlinkUsage

Adm

issi

on G

rant

ed

Adm

issi

on G

rant

ed

Adm

issi

on G

rant

ed

.A

dmis

sion

Gra

nted

non-

guar

ante

ed /

non-

hand

over

non-

guar

ante

ed /

hand

over

guar

ante

ed /

non-

hand

over

guar

ante

ed-h

s / n

on-h

ando

ver

Adm

issi

on G

rant

edgu

aran

teed

/ ha

ndov

er

Adm

issi

on G

rant

edgu

aran

teed

-hs

/ han

dove

r


aseDlAdm

Non-guaranteed threshold aseDlAdm-BeMarginAseDl

Handover threshold/Guaranteed threshold

Rej

ect

Rej

ect Rej

ect

Rej

ect

Rej

ect

Rej

ect


Spreading Factor (SF) Limits Used in Admission Control


Admission control – HSDPA DL Channelization Codes

DL CodeUsage

Adm

issi

on G

rant

edR

ejec

t /S

oft C

ong.

Adm

issi

on G

rant

edR

ejec

t /S

oft C

ong.

Rej

ect/

Sof

t Con

g.A

dmis

sion

Gra

nted

non-

guar

ante

ed /

non-

hand

over

guar

ante

ed /

non-

hand

over

Gua

rant

eed-

hs /

non-

hand

over

dlCodeAdm

Non-guaranteed threshold dlCodeAdm-beMarginDlCode



Detection of DL Cell Congestion Due to Transmitted Power

= pwrHyst

300ms

Time

DL Transmitted Carrier Power

pwrAdm + pwrAdmOffset

pwrOffset

75ms

< pwrHyst

Startrelease ASEs

Congestion

300ms

= pwrHyst

Stop release ASEs

Congestionsolved


Cell Congestion Resolution for a Mix of Guaranteed and Non-Guaranteed Services in the Congested Cell

tmCongActionNGpwrHyst

x x x x xx

pwrHyst

tmCongAction

DL TransmittedPower

pwrOffset

releaseAseDlNg

releaseAseDlNg

releaseAseDlNg

releaseAseDlNg

releaseAseDl

tmCongAction releaseAseD

Congestionresolved

Congestion


pwrHyst

xx

pwrHyst tmInitialG

DL TransmittedPower

pwrOffset

releaseAseDl

tmCongAction

releaseAseDl

Congestion

Congestion resolved

Cell Congestion Resolution for a Situation With Only Guaranteed Services in the Congested Cell


Time

Congestion control – HSDPA

Power


tmInitialGtmInitialGhstmCongActionNgRelease non-guaranteed traffictmCongActionGhsRelease guaranteed HS traffictmCongActionRelease guaranteed traffic

All non-guaranteed traffic released.tmCongActionNg is restarted as tmInitialGhs has not expired.


ASE Release Order if Mix of Guaranteed & Non-Guaranteed Services

over Iur:over Iu:

Core Network

SRNC &

DRNC

Iu

Iur

SRNC

Iu

1. Non-guaranteed service class connections

6. CS/streaming service class connections

8. Speech users

2. Non-guaranteed service class connections

7. CS /streaming service class connections

9. Speech users

3. Guaranteed-hs service class connections & not allocated to the HS-PDSCH/HS-SCCH

5. Guaranteed-hs service class connections & allocated to the HS-PDSCH/HS-SCCH

4. Guaranteed-hs service class connections & not allocated to the HS-PDSCH/HS-SCCH


Detection of UL Cell Congestion Due to UL RTWP

= ifHyst

x ms

Time

RTWP

iFCong

iFOffset

75ms

< ifHyst

Block Admission Control

Congestion

x ms

= ifHyst

Congestionsolved

Unblock Admission control


Summary

The student should now be able to:

• Explain the purpose of the capacity management algorithm(s)

• Explain the interaction between the dedicated resource monitors and the different algorithms

• Describe the dedicated resources

• Describe admission control

• Describe congestion control

capacity management

Documents

configuration

capacity management

dedicated

existing ng

measure tx

reject soft

cell congestion

pdsch hs