Method of Calculating NodeB Util All Vendor V2.0

8/12/2019 Method of Calculating NodeB Util All Vendor V2.0

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Method of Calculating Node B Utilization


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Node B Utilization Factors

1. Code Utilization (DL)2. HSDPA Users (DL)3. CE Utilization (UL & DL)

4. Power Utilization (DL)(DL Load)5. Interference Level (UL)

(UL Load)6. IuB Utilization


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DL Code Tree


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Code Utilization

Isat currently use one WCDMA Frequency Band: DL: 2140-2145 MHz, ARFCN 10713The number of available Codes for one Freq band is 256 codesDefined as the usage of WCDMA Spreading Code divided by 25612 code is used for Common Channel (signaling, FACH etc)

For HSDPA 5 codes, 80 codes (5x16) is allocated for HSDPA, so inzero traffic the code utilization is 92/256 = 36%Current Measurement: One measurement period: E=15 minutes, H=30 minutes, N=60 minutes Interval between samples: E=5s, H, 5s, N: 1sThreshold: 75%Congestion Impact: low throughputRemedy: split sector (consider antenna beam width), add new siteCode utilization to be considered is DL only, while UL is notnecessary since every mobile is using its own scrambling tree.


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HSDPA Session

Maximum users that can get HSDPA service is 16concurrent sessionThe 17 th HS user will get UMTS sessionUtilization is number of concurrent users divided by 16

Current Measurement: One measurement period: E=15 minutes, H=30 minutes, N=60

minutes Interval between samples: E=5s, H, 5s, N: 20s

Threshold: 75%Congestion Impact: The 17 th HS user will get UMTS upto PS32Kbps.Remedy: add new license


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Number of Concurrent Sessions UsingServices

Regarding of Code and HS Session utilization, maximumnumber of session is as below: 16 HS session with throughput of at least 150 Kbps 18 R99 session with assumed throughput of 64Kbps

The 18 is coming from limitation of code for 1 WCDMA in whichPS64Kbps users needs 8 codes of SF256.Total codes = 256HSDPA 5 codes = 80Common channel = 16The rest is 160For HSDPA associate code = 1 x 16 users = 16

The rest = 1441 user PS64 needs 8 codes, so max is 18 users

But currently Node-B is dimensioned less than the session, interms of HW and license


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Data Samples within One MeasurementPeriod

0

0.1

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1

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Interval betweensamples:

One MeasurementPeriodE=15 minutesH=30 minutesN=60 minutes

Max value

Min value

Middle value

Weekly Utilization iscalculated as the peakmiddle value within busiestday of the busiest weekWeekly Utilization > 75%

to be decongested.


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No of CellsNo of

SitesCode De-

CongestionHS Users De-

Congestion

JBRO 2664 1011 2.40% 0.04%

W-Java 242 88 30.58% 3.72%

C-Java 340 116 26.76% 8.24%

E-Java BN 472 161 6.14% 0.64%

N-Sumatra 233 80 4.72% 0.86%

S-Sumatra 59 18 0.00% 0.00%

Kalimantan 115 41 1.74% 0.00%

Sulampap 165 59 1.82% 0.61%

No of Cells to be De-congested W-10

Criteria: more than 75% of weekly peak busiest hour of middle value sampling


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CE Utilization

CE is the processing power of Node-B used to servesubscribers communication. Different between vendors.Benchmark is to calculate how many CE needed for 16HS and 18 of 64Kbps users per cells (or 48 HS and 5464Kbs users per sites)Current Measurement: One measurement period: E=15 minutes, H=30 minutes, N=60

minutes Interval between samples: E=5s, H, 5s, N: 1s

Threshold: 75%Congestion Impact: low or zero throughputRemedy: add new CE (or license)


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No ofCells

No ofSites

CE De-Congestion

JBRO 2664 1011 11.67%

W-Java 242 88 63.64%

C-Java 340 116 36.21%E-Java BN 472 161 73.91%

N-Sumatra 233 80 77.50%

S-Sumatra 59 18 77.78%

Kalimantan 115 41 56.10%

Sulampp 165 59 49.15%Criteria: more than 75% of weekly peak busiest hour of middle value sampling


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Power Utilization

Node-B is to allocate DL power to every online users inits area.Defined as total power needed to serve all subs in a celldivided by power capacity (20 watt, 40 watt, 60 watt).

Threshold: 75%Impact of congestion: low throughput, can not connect,connection dropped for UE far from Node-B.Remedy: Upgrade power (some Node-B need to replace

HW, other Node-B only open license), split sector, addsite.


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Power De-Congestion

JBRO 34.80%

W-Java 69.42%

C-Java 75.88%

E-Java BN 5.51%

N-Sumatra 0.00%

S-Sumatra 0.00%

Kalimantan 0.00%

Sulampp 0.00%


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UL Load

Total Noise (including due to Traffic) divided by Noisedue to non traffic.Threshold: 6dB (75%)Impact of congestion: low throughput

Remedy: finding source of external interference ortroubleshoot connectors/repeaters (if noise floor is high),split sector, new site.


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UL Load De-Congestion

JBRO 16.22%

W-Java 38.43%

C-Java 5.59%

E-Java BN 30.30%

N-Sumatra 14.59%

S-Sumatra 6.78%

Kalimantan 13.04%

Sulampp 0.00%


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IuB Utilization

Defined as the utilization of IuB links, in terms of physicaltransmission and in terms of ATM cells. ATM cells also provide the allocation for each service ofvoice, HS and R99.

Currently measurement from all Node-B no IuBcongested. Further assessment necessary.


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Noof

Cells

Noof

Sites CodeHS

Users CE PowerUL

Load IuB

JBRO 2664 1011 2.4% 0.0% 11.7% 34.8% 16.2% 0.0%

W-Java 242 88 30.6% 3.7% 63.6% 69.4% 38.4% 0.0%

C-Java 340 116 26.8% 8.2% 36.2% 75.9% 5.6% 0.0%

E-Java BN 472 161 6.1% 0.6% 73.9% 5.5% 30.3% 0.0%

N-Sumatra 233 80 4.7% 0.9% 77.5% 0.0% 14.6% 0.0%

S-Sumatra 59 18 0.0% 0.0% 77.8% 0.0% 6.8% 0.0%

Kalimantan 115 41 1.7% 0.0% 56.1% 0.0% 13.0% 0.0%Sulampp 165 59 1.8% 0.6% 49.2% 0.0% 0.0% 0.0%

Method of Calculating NodeB Util All Vendor V2.0

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