08_d Basic RF Optimization Based on Counters

Basic RF op opti timiza mizati tion on Wha hatt is poss possibl ible e to do d o w ith PM PM cou counters? nters?

Soc Classification level 1 © Nokia Siemens Ne Networ ks

Presentation / Author / Date

Bad dow nlink vs good dow nlink, live network example 70000000

CQI = 14 60000000 Data Sum of M8010C036 UE Reported CQI Level 00 Sum of M8010C037 UE Reported CQI Level 01

50000000

Sum of M8010C038 UE Reported CQI Level 02 Sum of M8010C039 UE Reported CQI Level 03

Good DL coverage

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

40000000

Sum of M8010C042 UE Reported CQI Level 06 Sum of M8010C043 UE Reported CQI Level 07 Sum of M8010C044 UE Reported CQI Level 08 30000000

Sum of M8010C045 UE Reported CQI Level 09

Fairly bad DL coverage (or DL interference)

20000000

Sum of M8010C046 UE Reported CQI Level 10 Sum of M8010C047 UE Reported CQI Level 11 Sum of M8010C048 UE Reported CQI Level 12 Sum of M8010C049 UE Reported CQI Level 13 Sum of M8010C050 UE Reported CQI Level 14 Sum of M8010C051 UE Reported CQI Level 15

10000000

0 100589

100953 BTS

Soc Classification level 2 © Nokia Siemens Networks


Bad uplink coverage vs good uplink coverage, live network example Data

500000

450000

UE Power Headroom: -1dB <= PHR < +1dB.

UE Power Headroom: 15dB <= PHR < -13dB.

Sum of M8005C055 UE Power Headroom f or PUSCH Level 2

Open-loop UL PC used

400000

Sum of M8005C056 UE Power Headroom f or PUSCH Level 3 Sum of M8005C057 UE Power Headroom f or PUSCH Level 4 Sum of M8005C058 UE Power Headroom f or PUSCH Level 5

350000


300000

Sum of M8005C060 UE Power Headroom f or PUSCH Level 7 Sum of M8005C061 UE Power Headroom f or PUSCH Level 8

250000

200000


Fairly good UL coverage

Fairly bad UL coverage

150000

Sum of M8005C062 UE Power Headroom f or PUSCH Level 9 Sum of M8005C063 UE Power Headroom f or PUSCH Level 10 Sum of M8005C064 UE Power Headroom f or PUSCH Level 11 Sum of M8005C065 UE Power Headroom f or PUSCH Level 12

100000

Sum of M8005C066 UE Power Headroom f or PUSCH Level 13 50000

Sum of M8005C067 UE Power Headroom f or PUSCH Level 14 Sum of M8005C068 UE Power Headroom f or PUSCH Level 15

0 100589 Soc Classification level 3 © Nokia Siemens Networks

100953 BTS Presentation / Author / Date

Sum of M8005C069 UE Power Headroom f or PUSCH Level 16 Sum of M8005C070 UE Power Headroom f or

UL Power Headroom

• For PUSCH, subframe i power headroom is: PH (i )  PCMAX



10 log 10 ( M PUSCH (i))  PO_PUSCH ( j )   ( j )  PL   TF (i )  f (i )

• UL power headroom presents the available UE tx power – Note: negative values allowed  max UE tx power – Table below shows UE reporting range


Reported value

Measured quantity value (dB)

POWER_HEADROOM_0

-23  PH  -22

POWER_HEADROOM_1

-22  PH  -21

POWER_HEADROOM_2

-21  PH  -20

POWER_HEADROOM_3

-20  PH  -19

POWER_HEADROOM_4

-19  PH  -18

POWER_HEADROOM_5

-18  PH  -17





POWER_HEADROOM_61

38  PH  39

POWER_HEADROOM_62

39  PH  40

POWER_HEADROOM_63

PH ≥ 40


DL MCS distributions Transmission share, PDSCH 20.00

. Transmission share per MCS starts with MCS1, having 28 categories for MCS. MCS 0 is missing.

18.00 16.00 14.00 12.00

Cell1

10.00

Cell2 Cell3

8.00 6.00

MCS 10 and 17 are used very seldom.

4.00 2.00 0.00

In most cases higher MCSs carry more traffic compared to transmission share of those. However, in some cells the there i s opposite trend (could be due to different MIMO mode distribution?)

1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 S S S S S S S S S 1 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 C C C C C C C C C S S S S S S S S S S S S S S S S S S S M M M M M M M M M C C C C C C C C C C C C C C C C C C C M M M M M M M M M M M M M M M M M M M

Share of DL Traffic per MCS 20.00 18.00 16.00

80.00

14.00

70.00

12.00

60.00

10.00

Cell1 Cell2 Cell3

50.00

40.00

Cell1

8.00

Cell2

6.00

Cell3 30.00

4.00

20.00

2.00

10.00

0.00

0.00

OL div

OL spatial mux


0 S C M

1 S C M


2 S C M

3 S C M

4 S C M

5 S C M

6 S C M

7 S C M

8 9 0 1 2 S S 1 1 1 C C S S S M M C C C M M M

3 1 S C M

4 1 S C M

5 1 S C M

6 7 1 1 S S C C M M

8 1 S C M

9 0 1 2 S S C C M M

1 2 S C M

2 3 2 2 S S C C M M

4 2 S C M

5 6 2 2 S S C C M M

7 2 S C M

8 2 S C M

UL MCS distributions Transmission s hare, PUSCH 90.00

Maximum MCS is used mostly in UL. In this case, having higer MCSs availa ble in UL would bring capacity gain.

80.00 70.00 60.00 Cell1

50.00

Cell2 40.00

Cell3

30.00 20.00 10.00 0.00 7 2 8 0 1 2 3 4 5 6 7 8 9 0 1 1 2 1 3 4 5 1 6 7 1 8 9 2 0 2 1 2 2 2 3 4 2 5 2 6 2 C S C S C S C S C S C S C S C S C S C S S 1 S S 1 S S 1 S 1 S S 1 S S 1 S S S S S 2 S S S S M M M M M M M M M M M C M C M C M C M C M C M C M C M C M C M C M C M C M C M C M C M C M C M C

Share of UL Traffic per MCS 100.00

90.00 80.00

70.00 60.00 Cell1 50.00

Cell2 Cell3

40.00

30.00 20.00 10.00

0.00



0 1 2 3 4 5 6 7 8 9 0 1 3 4 6 9 2 5 7 8 0 C S C S C S C S C S C S C S C S C S C S C S 1 C S 1 C S 1 C S 1 C S 1 C S 1 C S 1 C S 1 C S 1 C S 1 C S 2 M M M M M M M M M M M M M M M M M M M M M

UE Tx power Level1: -23…-21dB => UE tx power … Level31: 37..39dB UE Power Headroo m 600

500

400 Cell1 300

Cell2 Cell3

200

100

0

1 l e v e L

2 l e v e L

3 l e v e L

4 l e v e L

5 l e v e L


6 l e v e L

7 l e v e L

8 l e v e L

9 l e v e L

0 1 l e v e L

1 1 l e v e L

2 1 l e v e L

3 1 l e v e L


4 1 l e v e L

5 1 l e v e L

6 1 l e v e L

7 1 l e v e L

8 1 l e v e L

9 1 l e v e L

0 2 l e v e L

1 2 l e v e L

2 2 l e v e L

3 2 l e v e L

4 2 l e v e L

5 2 l e v e L

6 2 l e v e L

7 2 l e v e L

8 2 l e v e L

9 2 l e v e L

0 3 l e v e L

1 3 l e v e L

2 3 l e v e L

Cell load, PRBs

DL PRB utilization 100.00 90.00 80.00 70.00

•Utilization is either very low (<10%) or close to 100%

%

60.00

Cell1

50.00

Cell2

40.00

Cell3

30.00 20.00 10.00 0.00

% % % % % % % % % % 0 1 0 2 0 3 0 4 0 7 0 8 0 9 0 5 0 6 0 1 0 = = = = = = = = < = < < < < < < < < L < = I L L L L L L L L I I I I I I I I T L I T T T T T T T T U T U U U U U U U U B U B B B B B B B B R B R R R R R R R R P R P P P P P P P P P < < < < < < < < < % % % % % % % % % 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0

UL PRB utilization lev el per TTI 100.00 90.00 80.00 70.00 60.00

Cell1

50.00

Cell2

40.00

Cell3

30.00 20.00 10.00 0.00


% % % % % % % % % % 0 0 2 0 4 0 5 0 6 0 8 0 9 0 3 0 7 0 < 1 1 0 = = = = = = = = L I < < < < < < < < < = T L L L L L L L L I I I I I I I I U L I T T T T T T T T B T U U U U U U U U R U B B B B B B B B P B R R R R R R R R R P P P P P P P P P < < < < < < < < < % % % % % % % % % 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 Presentation / Author / Date

CQI vs. MCS/MIMO distribution UE reported CQI per level 60,000

50,000

40,000 Cell1 30,000

Cell2 Cell3

20,000

10,000

0

8 0 1 2 3 4 5 6 7 9 0 1 2 3 4 5 l 0 l 0 l 0 l 0 l 0 l 0 l 0 l 0 l 0 l 0 l 1 l 1 l 1 l 1 l 1 l 1 v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e v e e L L L L L L L L L L L L L L L L

Transmission share, PDSCH 14.00

12.00

80.00

10.00

70.00

8.00

Cell1 60.00

Cell2 Cell3

6.00

50.00

Cell1 Cell2

40.00

4.00

Cell3 30.00

2.00

20.00

10.00

0.00

1 2 S S C C M M

3 4 S S C C M M

5 6 S S C C M M

7 8 9 S S S C C C M M M


0 1 1 1 S S C C M M

2 3 1 1 S S C C M M

4 5 1 1 S S C C M M

6 7 1 1 S S C C M M

8 9 1 1 S S C C M M


0 1 2 2 2 2 S S S C C C M M M

3 4 2 2 S S C C M M

5 6 2 2 S S C C M M

7 8 2 2 S S C C M M

0.00

OL div

OL spatial mux

Reporting Suite RL10 example

• Need NetAct OSS Cell Availability RRC connections Period start time PLMN Name Cell Avail Cell Avail excl BLU MO_S att MT att MO_D att Others att LTE_5750A LTE_5239A LTE_5232A LTE_523 LTE_5234A LTE_5235A 03.08.2011 NTN 92.02 96.30 71 8 359 0 03.09.2011 NTN 95.65 100.00 247 230 872 0 03.10.2011 NTN 95.55 99.94 400 41 1 121 0 03.11.2011 NTN 95.61 99.91 3 820 64 1 256 0 03.12.2011 NTN 95.65 100.00 1 23 687 0 03.13.2011 NTN 95.65 100.00 0 0 0 0 03.14.2011 NTN 95.61 100.00 1 142 133 4 117 0 03.15.2011 NTN 94.99 99.30 2 193 35 7 358 0 03.16.2011 NTN 91.30 95.20 2 051 39 9 680 0 03.17.2011 NTN 91.68 95.66 2 504 59 6 518 0 03.18.2011 NTN 91.65 95.59 1 527 3 7 937 0 03.19.2011 NTN 91.68 95.65 615 0 8 574 0 03.20.2011 NTN 91.68 95.65 645 0 8 785 0 03.21.2011 NTN 91.67 95.65 826 0 10 858 0

Radio Bearer RRC SSR Rel SR Stp att Data stp SR LTE_5218 LTE_521 LTE_522 LTE_5116 LTE_5003A 99.32 786 50.25 549 100.00 98.89 2 244 54.32 1 741 99.20 94.88 1 952 55.48 2 466 97.49 42.35 2 637 73.23 3 016 99.67 94.66 673 61.96 670 100.00 0 0 87.30 4 860 75.39 8 799 98.42 82.95 7 980 90.65 10 227 98.69 82.12 9 881 91.84 10 063 99.72 81.51 8 092 81.14 7 603 99.72 88.87 9 115 85.09 11 825 99.04 98.05 9 010 93.50 8 607 99.98 97.01 9 150 93.28 8 876 99.97 93.39 9 353 93.49 9 594 99.75

example_rs_report _RL10.xls Soc Classification level 10 © Nokia Siemens Networks


Data SR Data DR LTE_5117 LTE_5004 96.26 3.74 97.69 2.31 86.57 13.43 93.72 6.28 62.24 37.76 90.83 97.44 98.12 96.57 98.19 99.60 99.58 98.97

9.17 2.56 1.88 3.43 1.81 0.40 0.42 1.03

KPI reporter example • The counter data is stored in iOMS xmlfilesBU directory • https://isource.access.nokiasiemensnetworks.com/projects/kpireporter/



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 calculate radio drops per minute

– Always-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.. Soc Classification level 12 © Nokia Siemens Networks


08_d Basic RF Optimization Based on Counters

Recommend Documents