CE Utilization Calculation for ERICSSON

Slide title

In CAPITALS

50 pt

Slide subtitle

32 pt

CE Utilization Calculation

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt

Ericsson Confidential 2009-07-282Ericsson Confidential 2009-07-282

Content

CE Definition

CE Ladder of DPDCH and E-DPDCH in RAX2 and

RAX2e

CE usage in HSPA

Getting Hardware Config using Moshell

Calculating CE Utilisation using TrgAcc & TrigScan

Counters

Calculating CE Utilisation using pdf Counter

Summary

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Definition

Channel Elements is measure of board capacity resources for handling of user

dedicated data channel and dedicated signaling channel

Normalization of 1 CE:

• Downlink (DL): One AMR 12.2 kbps with SF=128

• Uplink (UL): One AMR 12.2 kbps with SF=64

Net CE: Dedicated Channel (DCH) resources available in the system

Gross CE: Resources available in the system including Dedicated Channel (DCH),

Common Channel (CCH) and Softer Handover

UL and DL are on separate boards (TX Boards for DL and RAX Board for UL)

Uplink, RAX (R1)

16 Nett CE

Uplink, RAX (R2)

32 Nett (64 Gross) CE



Uplink, RAX (R2e)

128 Nett CE (176 Gross)

Downlink, TX (R1/R2)

228 Nett CE

Downlink, TX (R3)




Downlink, HS-TX

128 Nett (172 Gross)

384 Nett (516 Gross)

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of RAX R2 - DPDCH

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of RAX R2 – E-DPDCH

(10 ms TTI)

Default : ROJ 119 2187/1, /2 and /3 only support this CE Ladder for E-DPDCH.

ROJ 119 2187/1 can handle up to 40, /2 up to 20 and /3 up to 10 E-DPDCH.

Optional : Change to the optional CE Ladder for E-DCH is done with SW feature FAJ 121

1157 “Channel Element Ladder for E-DCH with RAX R2”.

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of RAX R2e - DPDCH

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of RAX R2e – E-DCH

Optional : Change to the improved CE Ladder for E-DCH is done with SW feature FAJ 121

1334 “Improved Channel Element Ladder for E-DCH”.

Only Supported with

2 ms TTI

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of TX-R1/R2 - DPDCH

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of TX-R3 - DPDCH

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Ladder of HS-TX - DPDCH

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


HSDPA CE USAGE

HS-DSCH does not consume channel elements

DL A-DCH does not consume channel elements from

normal SW licensed pool

UL A-DCH consumes channel elements from normal

SW licensed pool and has to be considered in

calculations

HSDPA 64/HS consumes 4 CE in UL per connection

HSDPA 384/HS consumes 16 CE in UL per connection

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


HSUPA CE USAGE

E-DCH connections consume CEs from SW licensed

CE pool

Certain amount of CEs is used for several bit rates

offered by E-DCH

The resources for E-DCH are controlled by EUL

scheduler located in the RBS (not RNC)

When EUL connection is accepted, each E-DCH user

has a minimum CE allocated to make it possible to

send non-scheduled data (e.g signaling and rate

request)

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


HSUPA CE USAGE

Additional CEs re-scheduling in the RBS

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Notes on HSDPA/EUL CE usage

EUL can only be used by connections that use HS-

DSCH in the DL

Not all HSDPA terminals/UEs are EUL capable

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


How to Calculate CE Utilisation ?

TrigAcc & TrigSCAN

Counter

Calculating CE Usage

Divide by HW Capacity

CE Utilization

Pdf Counter

Calculating mean

Mean CE Utilization

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Moshell Command to Get Installed

Boards

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Moshell Command to Get Hw and Sw

Active CE Capacity

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Statistic Measurements – TrigAcc & TrigSCAN

Counters Calculating CE Usage

Counter Used :

pmSumDlCredits/pmSumUlCredits (MO Class : Iublink, Type: TrigAcc)

Aggregate of total consumed RBS DL/UL credit measurements (in credits).

pmSamplesDlCredits/pmSamplesUlCredits (MO Class : Iublink, Type: TrigSCAN)

Number of samples in pmSumDlCredits (that is, pmSamplesDlCredits =pmSamplesDlCredits +1,

whenever pmSumDlCredits is to be updated).

Reset at each ROP period.

Formula : CE Usage = pmSumDlCredits / pmSamplesDlCredits (DL)

CE Usage = pmSumUlCredits / pmSamplesUlCredits (UL)

Calculating CE UtilisationExample:

HW installed 2 ROJ 119 2187/14 ( RAX R2e type) containing 128 CE

pmSumUlCredits = 136575

pmSamplesUlCredits = 900

Uplink CE Usage = 136575/900 = 151.75

CE Utilization = 151.75 / 256 = 59,28 %

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Statistic Measurements – pdf Counter

If Hardware capacity is unknown, there’s another way to calculate CE Utilisation : using pdf counter

Counter Used : pmUlCredits (UL) / pmDlCredits (Dl)

[MO Class :Iublink)]

pmUlCredits:

The total consumed RBS UL credits, as a percentage. Stored in percentage, according to the intervals below:

– [0] : 0 <= x < 25– [1] : 25 <= x < 50– [2] : 50 <= x < 60– [3] : 60 <= x < 70– [4] : 70 <= x < 75– [5] : 75 <= x < 80– [6] : 80 <= x < 85– [7] : 85 <= x < 90– [8] : 90 <= x < 95– [9] : 95 <= x

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Statistic Measurements – pdf

Counters[[

0]

: 0

<=

x <

25

%

[1]

: 2

5 <

= x

< 5

0 %

[2]

: 5

0 <

= x

< 6

0 %

[3]

: 6

0 <

= x

< 7

0 %

[4]

: 7

0 <

= x

< 7

5 %

[5]

: 7

5 <

= x

< 8

0 %

[6]

: 8

0 <

= x

< 8

5 %

[7]

: 8

5 <

= x

< 9

0 %

[8]

: 9

0 <

= x

< 9

5 %

[9]

: 9

5 <

= x

12.5% 37.5% 55.0% 65.0% 72.5% 77.5% 82.5% 87.5% 92.5% 97.5%

0 1 19 149 115 78 53 30 5 0

pmUlCredits

CE Utilzation mean = pmUlCreditsmean

= 0*12,5% + 1*37,5% + 19*55% + 149*65% + 115*72,5% + 78*77,5% + 53*82,5% + 30*87,5% + 5*92,5% +

0*97,5%_______________________________________________

450= 72.47%

Range

Mid Value

Samples

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Comparison of Measurements (1)CE Utilization

0.00%

10.00%

20.00%

30.00%

40.00%

50.00%

60.00%

70.00%

80.00%

90.00%

100.00%

0:00

3:30

4:15

5:00

5:45

6:30

7:15

8:00

8:45

9:30

10:1

5

11:0

0

11:4

5

12:3

0

13:1

5

14:0

0

14:4

5

15:3

0

16:1

5

17:0

0

17:4

5

18:3

0

19:1

5

20:0

0

20:4

5

21:3

0

22:1

5

23:0

0

23:4

5

Period (Hour)

Uti

liza

tio

n (

%)

Using Utilization Counter

Using Sum/Samples Counter

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Comparison of Measurements (2)CE Utilization

0.00%

10.00%

20.00%

30.00%

40.00%

50.00%

60.00%

70.00%

80.00%

90.00%

0:00

3:30

4:15

5:00

5:45

6:30

7:15

8:00

8:45

9:30

10:1

5

11:0

0

11:4

5

12:3

0

13:1

5

14:0

0

14:4

5

15:3

0

16:1

5

17:0

0

17:4

5

18:3

0

19:1

5

20:0

0

20:4

5

21:3

0

22:1

5

23:0

0

23:4

5

Period (Hour)

Uti

liza

tio

n (

%)

Using Utilization Counter

Using Sum/Samples Counter

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Utilization in Relation to

pmNoFailedRabEstAttemptLackUlHwBest

CE Utilization Vs pmNoFailedRabEstAttemptLackUlHwBest

0.00%

10.00%

20.00%

30.00%

40.00%

50.00%

60.00%

70.00%

80.00%

90.00%

100.00%

0:00

3:30

4:15

5:00

5:45

6:30

7:15

8:00

8:45

9:30

10:1

5

11:0

0

11:4

5

12:3

0

13:1

5

14:0

0

14:4

5

15:3

0

16:1

5

17:0

0

17:4

5

18:3

0

19:1

5

20:0

0

20:4

5

21:3

0

22:1

5

23:0

0

23:4

5

CE

Uti

liza

tio

n [

%]

0

200

400

600

800

1000

1200

1400

Co

un

t o

f p

mN

oFa

ile

dR

ab

EstA

tte

mp

tLa

ck

UlH

wB

est

Using Utilization Counter Using Sum/Samples Counter pmNoFailedRabEstAttemptLackUlHwBest

UlHwAdm=85

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Utilization in Relation to

pmNoFailedRabEstAttemptLackUlHwBest – Cont’d

Samples of [85%<=pmUlCredits<100%] Vs pmNoFailedRabEstAttemptLackUlHwBest

0

100

200

300

400

500

600

700

800

0:0

0

3:1

5

3:4

5

4:1

5

4:4

5

5:1

5

5:4

5

6:1

5

6:4

5

7:1

5

7:4

5

8:1

5

8:4

5

9:1

5

9:4

5

10:1

5

10:4

5

11:1

5

11:4

5

12:1

5

12:4

5

13:1

5

13:4

5

14:1

5

14:4

5

15:1

5

15:4

5

16:1

5

16:4

5

17:1

5

17:4

5

18:1

5

18:4

5

19:1

5

19:4

5

20:1

5

20:4

5

21:1

5

21:4

5

22:1

5

22:4

5

23:1

5

23:4

5

pm

UlC

red

its S

am

ple

s

0

200

400

600

800

1000

1200

1400

pm

No

Fa

ile

dR

ab

EstA

tte

mp

tLa

ck

UlH

wB

est

[7] : 85 <= x < 90 % [8] : 90 <= x < 95 % [9] : 95 <= x pmNoFailedRabEstAttemptLackUlHwBest

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


Summary

1. There are two ways to measure CE utilisation :

Using TrigAcc & TrigSCAN Counter– Calculating CE Usage and then divide by HW capacity to

get CE Utilization

– Calculating mean value to get mean CE utilization

Using pmUlCredits/pmDlCredits pdf counter– Calculating mean value to get mean CE utilization

2. Pdf counter can show instantaneous CE usage in ranges

which can not be observed by TrigAcc & TrigScan counters

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


References

WCDMA Radio Capacity, Jun Jack Yong, N&TC/GSDC

Malaysia

RBS 3000 Baseband Product Description,1/221 01-

FGC 101 811 Uen Rev S

Channel Elements Dimensioning, Ante Tomljanovic

Top right

corner for

field

customer or

partner logotypes.

See Best practice

for example.

Slide title

40 pt

Slide subtitle

24 pt

Text

24 pt

5

20 pt


CE Utilization Calculation for ERICSSON

Documents

ce ladder of tx

improved ce ladder

optional ce ladder

ce utilisation

rax r2e128 nett ce

net ce

system gross ce

ce ladder of rax r2