ce utilization calculation for ericsson

CE Utilization Calculation in P5-P6Slide title In CAPITALS 50 pt Slide subtitle 32 pt
CE Utilization Calculation
Top right corner for field-mark, customer or partner logotypes. See Best practice for example.
Slide title 40 pt Slide subtitle 24 pt Text 24 pt Bullets level 2-5 20 pt
Ericsson Confidential
CE Ladder of DPDCH and E-DPDCH in RAX2 and RAX2e
CE usage in HSPA
Calculating CE Utilisation using TrgAcc & TrigScan Counters
Calculating CE Utilisation using pdf Counter
Summary
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:
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)
Uplink, RAX (R2e)
Downlink, TX (R1/R2)
228 Nett CE
Downlink, TX (R3)
Downlink, HS-TX
128 Nett (172 Gross)
384 Nett (516 Gross)
CE Ladder of RAX R2 - DPDCH
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”.
CE Ladder of RAX R2e - DPDCH
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
CE Ladder of TX-R1/R2 - DPDCH
CE Ladder of TX-R3 - DPDCH
CE Ladder of HS-TX - DPDCH
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
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)
Additional CEs re-scheduling in the RBS
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
TrigAcc & TrigSCAN
Mean CE Utilization
Moshell Command to Get Installed Boards
Moshell Command to Get Hw and Sw Active CE Capacity
Calculating CE Usage
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 Utilisation
Example:
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 %
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
Statistic Measurements – pdf Counters
CE Utilzation mean = pmUlCreditsmean
_______________________________________________
Samples
Comparison of Measurements (1)
Comparison of Measurements (2)
UlHwAdm=85
CE Utilization in Relation to pmNoFailedRabEstAttemptLackUlHwBest – Cont’d
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
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
[[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
12.5%37.5%55.0%65.0%72.5%77.5%82.5%87.5%92.5%97.5%
011914911578533050
pmUlCredits
Samples of [80%<=pmUlCredits<100%] Vs pmNoFailedRabEstAttemptLackUlHwBest
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0:003:153:454:154:455:155:456:156:457:157:458:158:459:159:45
10:1510:4511:1511:4512:1512:4513:1513:4514:1514:4515:1515:4516:1516:4517:1517:4518:1518:4519:1519:4520:1520:4521:1521:4522:1522:4523:1523:45
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pmNoFailedRabEstAttemptLackUlHwBest
[6] : 80 <= x < 85 %[7] : 85 <= x < 90 %[8] : 90 <= x < 95 %[9] : 95 <= x pmNoFailedRabEstAttemptLackUlHwBest
Samples of [85%<=pmUlCredits<100%] Vs pmNoFailedRabEstAttemptLackUlHwBest
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0:003:153:454:154:455:155:456:156:457:157:458:158:459:159:45
10:1510:4511:1511:4512:1512:4513:1513:4514:1514:4515:1515:4516:1516:4517:1517:4518:1518:4519:1519:4520:1520:4521:1521:4522:1522:4523:1523:45
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pmNoFailedRabEstAttemptLackUlHwBest
[7] : 85 <= x < 90 %[8] : 90 <= x < 95 %[9] : 95 <= x pmNoFailedRabEstAttemptLackUlHwBest
UL
DL

ce utilization calculation for ericsson

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