KPIs+monitoring+rules+-+Interference

Soc Classification level Presentation / Author / Date 1 © Nokia Siemens Networks

Interference analysis DL /UL

Rx Quality x Rx Level

Coverage Problem:Bad quality and Low Rx Level

Interference Problem:Bad quality and

High Rx Level

Good Quality

High Rv Level

HW Problem:

Bad Quality

for all Rx Levels

NWD report 204 model

Same level – quality distribution for both UL and DL

HW Problem

All samples below -100dBm


Interference, UL

q0 q1 q2 q3 q4 q5 q6 q7-100dBm 10645 8516 6813 5450 4360 3488 2791 2232-95dBm 47043 37634 30108 24086 9865 7543 5643 2345-90dBm 56204 44963 35971 28776 16574 5676 845 65-80dBm 200863 160690 128552 102842 17654 3653 145 28-70dBm 1234 987 790 632 505 404 323 259-47dBm 24 19 15 12 10 8 6 5

MS power control can be seen here. If Power is reduced → no bad UL problems. BSC border is increasing good level samples


Bad interference problems. By POC parameter interference can be decreased, how power is adjusted etc. Also optimum MS power feature improves UL interference, no full power is sent after HO.


Bad quality sample due to coverage problems. Diversity should be checked, also possibilities to use LNA to improve UL coverage. Antenna place should be also checked if there are some obstacles near the antenna.


Interference, UL, examples

UL_q0 UL_q1 UL_q2 UL_q3 UL_q4 UL_q5 UL_q6 UL_q7 DL_q0 DL_q1 DL_q2 DL_q3 DL_q4 DL_q5 DL_q6 DL_q7-100dBm 251992 30668 20552 18417 18156 18286 16983 12478 27862 5537 5529 6069 6109 6107 5389 4119-95dBm 123653 1151 403 692 519 351 221 72 89094 4236 3853 3576 2893 2264 1372 584-90dBm 62938 247 144 288 353 129 62 29 142228 2732 2550 2356 1510 1114 774 404-80dBm 27005 51 65 149 177 82 40 16 222462 1523 1355 1552 716 812 1081 343-70dBm 2831 3 9 28 87 10 6 0 44504 91 123 151 81 101 191 88-47dBm 751 0 4 10 25 1 0 0 5994 49 17 17 12 29 65 10

Huge amount of UL bad samples. Cells is not working properly, it is like transferring traffic, UL quality/ UL level HO’s are triggering immediately. These kind of cells must be investigated.

UL_q0 UL_q1 UL_q2 UL_q3 UL_q4 UL_q5 UL_q6 UL_q7-100dBm 490 137 368 605 1014 1378 1830 2586-95dBm 8410 3768 3225 3023 2767 2304 1561 1859-90dBm 38512 5249 3066 2323 1692 1570 1191 1268-80dBm 219137 4600 2453 2311 1470 1724 1864 1221-70dBm 509591 2504 1812 3050 1271 1465 1649 337-47dBm 244302 582 711 1363 1713 873 671 87

UL_q0 UL_q1 UL_q2 UL_q3 UL_q4 UL_q5 UL_q6 UL_q7-100dBm 70004 5020 3500 2564 2232 1946 2190 2579-95dBm 80339 392 286 461 328 250 275 92-90dBm 106883 233 318 602 199 146 234 64-80dBm 246892 227 314 860 298 338 395 60-70dBm 254875 155 298 935 203 135 166 15-47dBm 23288 21 27 103 109 11 41 0

Some UL interference in good signal level. UL power control is not working properly. Ul power control is good indicator, if power is adjusted, there are no big problems in UL direction

There is no UL interfernce, or just little. MS is adjusting power properly, there are only little samples in good UL signal level.



Interference, DL

Bad interference problem → signal level good (<-80dBm) and sometimes no better cell available. If better cell available and quality samples are 4 or worse → HO (reason quality or interference, depends on the parameter) Interference is causing drops.

Really bad interference problem → signal level is really good (<-70dBm) and usually no better cell available → no HO → samples can be seen in the table. Interference is causing drops.

Situation is “network is working properly” If there are quality 4 or worse samples → quality HO. Most of the samples are q4 samples. If lots of q5..q7 samples → interference problem and interference must be analyzed / removed. If quality HOs but no q5..q7 samples → better cell is available → no interference problems. In these signal levels overlapping exists and if handover reason is no PBGT, it will be quality HO. By parameter amount of quality HOs can be adjusted




Bad quality samples due to coverage problems. If PBGT overlapping is not existing → lots of quality HOs + level HOs (margin are lower than in PBGT).

Not interference problem, more coverage problem.

Check how much samples vs. HOs → are better cells available or not.


Interference, DL, examples

DL_q0 DL_q1 DL_q2 DL_q3 DL_q4 DL_q5 DL_q6 DL_q7-100dBm 12057 2827 3108 3952 4783 6200 7013 8156-95dBm 44818 4811 5041 5866 6587 7223 7259 6781-90dBm 98587 7107 7400 8334 8470 8781 7825 6162-80dBm 225919 7450 7731 8445 7726 7441 5695 3369-70dBm 88708 1014 971 998 751 688 689 367-47dBm 15881 84 109 122 104 167 199 184


There are almost as much samples Q5 and Q7 samples as Q 4 samples → even interference is really bad or there is no better cell available ( no ho’s after bad quality samples). These kind of interference cells should be optimized, otherwise there are lots of drops etc

There are no as much Q5…Q7 samples as Q4 samples → after interference samples Quality HO is done or the interference situation is not so bad, for example sampling is Q0,Q2,Q4,Q2,Q5,Q0,Q2,Q3,Q4,Q2 → quality HO is not triggering


There are bad quality samples only due to coverage problems.

Documents

KPIs+monitoring+rules+-+Interference