08_d Basic RF Optimization Based on Counters

8/12/2019 08_d Basic RF Optimization Based on Counters

1/12

Soc Classification level

1 Nokia Siemens Networks Presentation / Author / Date

Basic RF optimizationWhat is possible to do with PM counters?


2/12



Bad downlink vs good downlink, live networkexample

0

10000000

20000000

30000000

40000000

50000000

60000000

70000000

100589 100953

Sum of M8010C036 UE Reported CQI Level 00




Sum of M8010C040 UE Reported CQI Level 04Sum of M8010C041 UE Reported CQI Level 05











BTS

Data

CQI = 14

Good DL coverage

Fairly bad DL

coverage (or DL

interference)


3/12



Bad uplink coverage vs good uplink coverage, livenetwork example

0

50000

100000

150000

200000

250000

300000

350000

400000

450000

500000

100589 100953

Sum of M8005C054 UE Power Headroom for

PUSCH Level 1

Sum of M8005C055 UE Power Headroom forPUSCH Level 2















Sum of M8005C070 UE Power Headroom forBTS

Data

UE Power Headroom: --

1dB


4/12



UL Power Headroom

For PUSCH, subframeipower headroom is:

UL power headroom presents the available UE txpower

Note: negative values allowed max UE tx powerTable below shows UE reporting range

)()()()())((log10)(TFO_PUSCHPUSCH10CMAX

ifiPLjjPiMPiPH

Reported value Measured quantity value (dB)

POWER_HEADROOM_0 -23 PH -22






POWER_HEADROOM_61 38 PH 39

POWER_HEADROOM_62 39 PH 40

POWER_HEADROOM_63 PH 40


5/12



Transmission share, PDSCH

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

20.00

MCS1

MCS2

MCS3

MCS4

MCS5

MCS6

MCS7

MCS8

MCS9

MCS10

MCS11

MCS12

MCS13

MCS14

MCS15

MCS16

MCS17

MCS18

MCS19

MCS20

MCS21

MCS22

MCS23

MCS24

MCS25

MCS26

MCS27

MCS28

Cell1

Cell2

Cell3

DL MCS distr ibutions

Share of DL Traffic per MCS

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

16.00

18.00

20.00

MCS0

MCS1

MCS2

MCS3

MCS4

MCS5

MCS6

MCS7

MCS8

MCS9

MCS10

MCS11

MCS12

MCS13

MCS14

MCS15

MCS16

MCS17

MCS18

MCS19

MCS20

MCS21

MCS22

MCS23

MCS24

MCS25

MCS26

MCS27

MCS28

Cell1

Cell2

Cell3

. Transmission share per MCS startswith MCS1, having 28 categories for

MCS. MCS 0 is missing.

MCS 10 and 17 are used very

seldom.

In most cases higher MCSs carry

more traffic compared to

transmission share of those.

However, in some cells the there is

opposite trend (could be due to

different MIMO mode distribution?)

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

OL div OL spatial mux

Cell1

Cell2

Cell3


6/12



UL MCS distr ibutionsTransmission share, PUSCH

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

MCS

0

MCS

1

MCS

2

MCS

3

MCS

4

MCS

5

MCS

6

MCS7

MCS

8

MCS

9

MCS

10

MCS

11

MCS

12

MCS

13

MCS

14

MCS

15

MCS

16

MCS

17

MCS

18

MCS

19

MCS

20

MCS

21

MCS

22

MCS

23

MCS

24

MCS

25

MCS

26

MCS

27

MCS

28

Cell1

Cell2

Cell3

Share of UL Traffic per MCS

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

90.00

100.00

MCS0

MCS1

MCS2

MCS3

MCS4

MCS5

MCS6

MCS7

MCS8

MCS9

MCS10

MCS11

MCS12

MCS13

MCS14

MCS15

MCS16

MCS17

MCS18

MCS19

MCS20

Cell1

Cell2

Cell3

Maximum MCS is used mostly in UL. Inthis case, having higer MCSs available in

UL would bring capacity gain.


7/12



UE Tx power

Level1: -23-21dB => UE tx power

Level31: 37..39dB

UE Power Headroom

0

100

200

300

400

500

600

Level1

Level2

Level3

Level4

Level5

Level6

Level7

Level8

Level9

Level10

Level11

Level12

Level13

Level14

Level15

Level16

Level17

Level18

Level19

Level20

Level21

Level22

Level23

Level24

Level25

Level26

Level27

Level28

Level29

Level30

Level31

Level32

Cell1

Cell2

Cell3


8/12



Cell load, PRBs

Utilization is either very low (


9/12



CQI vs. MCS/MIMO distributionUE reported CQI per level

0

10,000

20,000

30,000

40,000

50,000

60,000

Level0

0

Level0

1

Level0

2

Level0

3

Level0

4

Level05

Level0

6

Level07

Level0

8

Level0

9

Level1

0

Level1

1

Level1

2

Level1

3

Level1

4

Level15

Cell1

Cell2

Cell3

Transmission share, PDSCH

0.00

2.00

4.00

6.00

8.00

10.00

12.00

14.00

MCS1

MCS2

MCS3

MCS4

MCS5

MCS6

MCS7

MCS8

MCS9

MCS10

MCS11

MCS12

MCS13

MCS14

MCS15

MCS16

MCS17

MCS18

MCS19

MCS20

MCS21

MCS22

MCS23

MCS24

MCS25

MCS26

MCS27

MCS28

Cell1

Cell2

Cell3

0.00

10.00

20.00

30.00

40.00

50.00

60.00

70.00

80.00

OL div OL spatial mux

Cell1

Cell2

Cell3


10/12



Reporting Suite RL10 example

Need NetAct OSS

Period start time PLMN NameCell Avail Cell Avail excl BLU MO_S att MT att MO_D att Others att RRC SSR Rel SR Stp att Data stp SR Data SR Data DR

LTE_5750A LTE_5239A LTE_5232A LTE_523 LTE_5234A LTE_5235A LTE_5218 LTE_521 LTE_522 LTE_5116 LTE_5003A LTE_5117 LTE_5004

03.08.2011 NTN 92.02 96.30 71 8 359 0 99.32 786 50.25 549 100.00 96.26 3.74

03.09.2011 NTN 95.65 100.00 247 230 872 0 98.89 2 244 54.32 1 741 99.20 97.69 2.31

03.10.2011 NTN 95.55 99.94 400 41 1 121 0 94.88 1 952 55.48 2 466 97.49 86.57 13.43

03.11.2011 NTN 95.61 99.91 3 820 64 1 256 0 42.35 2 637 73.23 3 016 99.67 93.72 6.28

03.12.2011 NTN 95.65 100.00 1 23 687 0 94.66 673 61.96 670 100.00 62.24 37.76

03.13.2011 NTN 95.65 100.00 0 0 0 0 0 0

03.14.2011 NTN 95.61 100.00 1 142 133 4 117 0 87.30 4 860 75.39 8 799 98.42 90.83 9.1703.15.2011 NTN 94.99 99.30 2 193 35 7 358 0 82.95 7 980 90.65 10 227 98.69 97.44 2.56

03.16.2011 NTN 91.30 95.20 2 051 39 9 680 0 82.12 9 881 91.84 10 063 99.72 98.12 1.88

03.17.2011 NTN 91.68 95.66 2 504 59 6 518 0 81.51 8 092 81.14 7 603 99.72 96.57 3.43

03.18.2011 NTN 91.65 95.59 1 527 3 7 937 0 88.87 9 115 85.09 11 825 99.04 98.19 1.81

03.19.2011 NTN 91.68 95.65 615 0 8 574 0 98.05 9 010 93.50 8 607 99.98 99.60 0.40

03.20.2011 NTN 91.68 95.65 645 0 8 785 0 97.01 9 150 93.28 8 876 99.97 99.58 0.42

03.21.2011 NTN 91.67 95.65 826 0 10 858 0 93.39 9 353 93.49 9 594 99.75 98.97 1.03

Cell Availability RRC connections Radio Bearer

example_rs_report_RL10.xls


11/12



KPI reporter example

The counter data is stored in iOMS xmlfilesBU directory

https://isource.access.nokiasiemensnetworks.com/projects/kpireporter/
https://isource.access.nokiasiemensnetworks.com/projects/kpireporter/https://isource.access.nokiasiemensnetworks.com/projects/kpireporter/


12/12



Some PM obstacles RL10/RL20

No Timing Advance statistics

Cannot identify overshooting cells No PRACH statistics for discarded preambles due to

excessive distance Cannot troubleshoot PRACH problems for overshooting cells

No active state (scheduled) UE/cell throughput

Not possible to directly tell actual per-tti UE/cell tput as in HSDPA No UL noise rise measurement

Radio drop reasons not identified in counters No TA timer expiry or Radio Link Failure counters (just generic radio

drop counter) Emil needed for detailed drop call analysis

No bearer holding time available (directly) cannot calculateradio drops per minuteAlways-on applications reserve bearers for long time and even a few

drops can result in poor-looking drop ratio

Minutes per drop might be a better KPI..

08_d Basic RF Optimization Based on Counters

Documents

Transcript of 08_d Basic RF Optimization Based on Counters