Capacity Presentation 04212014 v2

EBRCS Capacity Phil Wenstrand

Jeff Van Dell

Outline

• Historical North-West Cell Site Utilization

• Historical North-West Cell Site Busies

• Historical Site Hourly Utilization – Weekday and Weekend

• Specific Site Statistics for 10/25/13, 10/26/13, 12/31/13, 1/1/14, 2/14/14

• March 2014 North-West Cell Capacity Analysis

• Traffic Projections and Next Steps

2

North-West Cell Average Hourly Site Utilization over 6 Months

3

North-West Cell Max Hourly Site Utilization over 6 Months

4

North-West Cell Radio Busies Over 6 Months

5

Site Utilization Hourly Summary - Weekday

6

Site Utilization Hourly Summary - Weekend

7

Site Utilization October, 25 2013

0

5

10

15

20

25

30

35

12am 1am 2am 3am 4am 5am 6am 7am 8am 9am 10am 11am 12pm 1pm 2pm 3pm 4pm 5pm 6pm 7pm 8pm 9pm 10pm 11pm

8

Affiliation and Call Counts October, 25 2013

0

200

400

600

800

1000

1200

Affiliation Count

Group Calls

9

Top 10 TGs (By Call Count) October, 25 2013

Talkgroup Call Count

ACSO1 2,248

APD 1 1,469

UCBPD 1 1,189

ACSO2 1,103

BPD 1 1,015

GDDFMAIN 994

SLPD 1 986

ABPD1 797

EPD 1 771

EB LAW1 541

Other (53 TGs) 3,828

TOTAL 14,941

ACSO1 15%

APD 1 10%

UCBPD 1 8%

ACSO2 7%

BPD 1 7%

GDDFMAIN 7%

SLPD 1 6%

ABPD1 5%

EPD 1 5%

EB LAW1 4%

Other 26%

10

Top 10 TGs (By Call Seconds) October, 25 2013

ACSO1 17%

APD 1 9%

ACSO2 8%

UCBPD 1 7%

SLPD 1 7%

BPD 1 7%

ABPD1 5%

EPD 1 5%

GDDFMAIN 5%

EB LAW1 4%

Other 26%

Talkgroup Total Call Duration

ACSO1 27,904

APD 1 14,606

ACSO2 12,650

UCBPD 1 12,207

SLPD 1 12,076

BPD 1 12,054

ABPD1 9,101

EPD 1 8,510

GDDFMAIN 7,945

EB LAW1 7,507

Other (53 TGs) 43,155

Total 210,870 11

Site Utilization October, 26 2013

0

5

10

15

20

25

30

35


12

Affiliation and Call Counts October, 26 2013

0

100

200

300

400

500

600

700

800

900

1000

Affiliation Count

Group Calls

13

Top 10 TGs (By Call Count) October, 26 2013


ACSO1 1,828

EB INT 1 1,429

APD 1 1,297

BPD 1 1,184

SLPD 1 1,123

EPD 1 1,008

ACSO2 997

GDDFMAIN 992

UCBPD 1 901

ABPD1 617


Total 14,530

ACSO1 12%

EB INT 1 10%

APD 1 9%

BPD 1 8%

SLPD 1 8%

EPD 1 7%

ACSO2 7%

GDDFMAIN 7%

UCBPD 1 6%

ABPD1 4%

Other 22%

14

Top 10 TGs (By Call Seconds) October, 26 2013

ACSO1 15%

BPD 1 9%

SLPD 1 9%

APD 1 8%

EB INT 1 7%

ACSO2 7%

EPD 1 7%

UCBPD 1 6%

GDDFMAIN 5%

ABPD1 4%

Other 23%


ACSO1 22,719

BPD 1 14,040

SLPD 1 13,183

APD 1 12,204

EB INT 1 11,429

ACSO2 11,424

EPD 1 10,544

UCBPD 1 9,059

GDDFMAIN 7,921

ABPD1 6,856

Other (41 TGs) 36,083

Total 155,462 15

Site Utilization December, 31 2013

0

5

10

15

20

25

30

35


16

Affiliation and Call Counts December, 31 2013

0

200

400

600

800

1000

1200

Affiliation Count

Group Calls

17

Top 10 TGs (By Call Count) December, 31 2013


CMED 2,311

ACSO1 1,349

SLPD 1 1,275

XAL DISP 3 1,087

APD 1 1,015

ACSO2 955

BPD 1 888

EPD 1 876

XAL DISP 2 873

XAL DISP 1 818


Total 15,806

CMED 15% ACSO1

8%

SLPD 1 8%

XAL DISP 3 7%

APD 1 6% ACSO2

6%

BPD 1 6%

EPD 1 6%

XAL DISP 2 5%

XAL DISP 1

5%

Other 28%

18

Top 10 TGs (By Call Seconds) December, 31 2013

CMED 15%

ACSO1 9%

SLPD 1 8%

BPD 1 6%

ACSO2 6%

APD 1 6%

EPD 1 6%

XAL DISP 2 6%

XAL DISP 3 5%

XAL DISP 1

5%

Other 28%


CMED 25,245

ACSO1 16,574

SLPD 1 14,262

BPD 1 11,325

ACSO2 10,552

APD 1 9,954

EPD 1 9,775

XAL DISP 2 9,725

XAL DISP 3 9,286

XAL DISP 1 8,026

Other (53 TGs) 48,601

Total 173,325 19

Site Utilization January, 1 2014

0

5

10

15

20

25

30

35


20

Affiliation and Call Counts January, 1 2014

0

100

200

300

400

500

600

700

800

900

1000

Affiliation Count

Group Calls

21

Top 10 TGs (By Call Count) January, 1 2014

CMED 16%

XAL DISP 3 9%

ACSO1 8%

SLPD 1 7%

BPD 1 7%

EPD 1 7%

APD 1 6%

ACSO2 6%

XAL DISP 2 6%

XAL DISP 1

4%

Other 24%


CMED 2,500

XAL DISP 3 1,448

ACSO1 1,268

SLPD 1 1,204

BPD 1 1,146

EPD 1 1,047

APD 1 1,024

ACSO2 989

XAL DISP 2 966

XAL DISP 1 709


Total 16,149

22

Top 10 TGs (By Call Seconds) January, 1 2014

CMED 15%

ACSO1 9%

SLPD 1 8%

BPD 1 8%

XAL DISP 3 7%

EPD 1 7%

ACSO2 6%

APD 1 6%

XAL DISP 2 6%

XAL DISP 1

4%

Other 24%


CMED 27,261

ACSO1 15,269

SLPD 1 14,217

BPD 1 13,698

XAL DISP 3 13,132

EPD 1 11,613

ACSO2 11,165

APD 1 11,109

XAL DISP 2 9,726

XAL DISP 1 7,002

Other (46 TGs) 42,043

Total 176,235 23

Site Utilization February, 14 2014

0

5

10

15

20

25

30

35

40


24

Affiliation and Call Counts February, 14 2014

0

200

400

600

800

1000

1200

Affiliation Count

Group Calls

25

Top 10 TGs (By Call Count) February, 14 2014


CMED 2,208

ACSO1 1,844

ACSO2 1,359

APD 1 1,346

XAL DISP 3 1,136

UCBPD 1 1,073

BPD 1 1,030

GDDFMAIN 968

XAL DISP 2 914

EPD 1 846


Total 19,027

CMED 12%

ACSO1 10%

ACSO2 7%

APD 1 7%

XAL DISP 3 6%

UCBPD 1 6%

BPD 1 5%

GDDFMAIN 5%

XAL DISP 2 5%

EPD 1 4%

Other 33%

26

Top 10 TGs (By Call Seconds) February, 14 2014


ACSO1 23,561

CMED 21,004

ACSO2 15,168

APD 1 14,110

BPD 1 13,363

XAL DISP 3 11,107

UCBPD 1 10,919

EPD 1 9,778

XAL DISP 2 9,484

SLPD 1 8,799

Other (59 TGs) 71,178

Total 208,471

ACSO1 11%

CMED 10%

ACSO2 7%

APD 1 7%

BPD 1 7%

XAL DISP 3 5% UCBPD 1

5%

EPD 1 5%

XAL DISP 2 5%

SLPD 1 4%

Other 34%

27

Busy Hour TG Load Profile

Talkgroup Msg Length (sec) Arrival Rate (call/unit/hr)

CMED 7 4.1

ACSO1 8.2 4.3

ACSO2 7.6 3.6

BPD1 8.9 3.7

APD1 6.6 2.8

XAL DISP3 7.7 3.7

UC4.BPD 1 6.9 4.9

XAL DISP 2 7.2 3.4

EPD 1 8.2 4.6

SLPD 1 7.6 3.1

28

Capacity Analysis

• Based on Recent ATIA data from 3/16/14 – 3/21/14

• Determined System Busy hour

• Calculate North-West Cell load during busy hour

• Projections for adding users to North-West Cell

29

Erlang Definition

An Erlang is a unit of telecommunications traffic measurement. Strictly speaking, an Erlang represents the continuous use of one voice path. In practice, it is used to describe the total traffic volume of one hour.

Example Calculation of Erlangs for Phone System

If a group of users made 30 calls in one hour, and each call had an average call duration of 5 minutes, then the number of Erlangs this represents is worked out as follows:

= 30 calls x (5 minutes)(60 seconds/min) = 2.5 Erlangs

3600 seconds

SecondsAvailableTotal

DurationCallAverageCallsof

SecondsAvailableTotal

SecondsUsageTotalErlangs

#

30

Erlang Definition - Trunking

3600

. DurationCallAvgRateCallUnitTalkgroupinUnitsActiveErlangs

Example Calculation of Erlangs for Trunking Talkgroup

Example Talkgroup with 300 active Units with call rate of 3.4 (calls per active

unit per hour) with average call duration of 7.2

= 300 Active Units x 3.4 call rate x 7.2 seconds = 2.04 Erlangs

3600 seconds

31

Grade of Service (GoS) Definition

Grade of Service (GoS): the probability that an arriving call will be queued, or busied.

EBRCS is designed to have a GoS of 1% or less for radio users.

32

North-West Cell (ERLANGs)

0

1

2

3

4

5

6

11:50am Site Busy Hour

33

North-West Cell Load (ERLANGs) Data averaged over a 24 hour period

0

0.5

1

1.5

2

2.5

3

3.5

4

0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00

3.05 ERLANGs during busy hour

34

Traffic Projections

Traffic Oakland Load (ERLANGs)

EBRCS Current Load (ERLANGs)

Total Load (ERLANGs)

# channels

Calculated GOS (%)

Current North-West Cell Time Consistent Busy Hour Load

0 3.0471

3.0471

16 0.0

City of Oakland Traffic assuming 100% of current load

3.0471 3.0471

6.0942 16 0.17

City of Oakland Traffic assuming 141% of current load

4.3029 3.0471

7.35 16 1.0

* # Channels includes the control channel - subtract 1 for talkpaths 35

Oakland Traffic Estimates Projecting EBRCS Load on Oakland System

Traffic EBRCS Load (ERLANGs)

# channels Calculated GOS (%)

Current North-West Cell Time Consistent Busy Hour Load

3.0471

16 0.0

100% of current EBRCS load 3.0471

10 0.45

114% of current EBRCS load 3.46

10

1.0

* # Channels includes the control channel - subtract 1 for talkpaths 36

Next Steps

• More accurate traffic projections would require talkgroup load profile data from City of Oakland based on measured system statistics.

• Talkgroup load profile during the busy hour (for each talkgroup)

– Average call duration

– Arrival Rate (calls/unit/hour)

– Number of active units

37

Questions?

38

Capacity Presentation 04212014 v2

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