How to improve CDR in 2G

[muctimonline]

Hi every one!


I am checking some IBC ( indoor building coverage) which have hight CDR

After UL interference is fixed, CDR is improved a litle but still hight (~ 3%)

Please give me some advise for my case!
Thank you,
Tien

[Ghost78]

Hi;

If the carried traffic is very low compared to normal sites "outdoor", you can do nothing for it, and the IBS site won't contribute to overall CDR, could you tell us what is the BH traffic in Erlang.

B.R

[muctimonline]

Hi;

If the carried traffic is very low compared to normal sites "outdoor", you can do nothing for it, and the IBS site won't contribute to overall CDR, could you tell us what is the BH traffic in Erlang.

B.R

Hi,thank for your answer.
I post today's traffic here




HOUR
TRAF
H_TRAF
CSSR2G (%)
CDR2G (%)


0
0.006
0
100
0


1
0.083
0
100
0


2
0.001
0

0


3
0.025
0
100
0


4
0.004
0
100
0


5
0.05
0
100
0


6
0.758
0
100
7.69


7
0.718
0
100
3.03


8
0.694
0
99.21
4.88


9
0.886
0
99.19
6


10
0.738
0
100
2


11
0.694
0
100
4.65


12
0.472
0
100
9.09


13
0.464
0
100
4.35


14
0.636
0
100
10.26


15
1.393
0
100
4.26


16
0.996
0
100
4.92


17
1.34
0
100
3.41


18
2.118
0.017
100
3.54


19
2.108
0
100
0


20
1.419
0
100
3.45


21
0.985
0
100
0


22
1.325
0
100
0


23
0.544
0
100
0

[muctimonline]

this is Traffic by one cell. Total ~ 18 Erl

i dont know why the CDR happen only on 1 cell, not 3 cells.

[Ghost78]

OK;

could you check from your side, what is the main reason of drops, "quality, Low signal strength, sudden, ...", this can help.
if the main reason is quality, check the frequency plan, or check if any Hardware issue related to this cell including RU, jumbers, feeder, splitters / tappers, a VSWR and DTF can detect any issue related to installation.
if the main reason is low signal strenght, you need to check the cell coverage by performing a walk test, and check whether it's fitting the plan.
if the main reason is sudden or other, check as well the coverage plot and the neighbor plan, some missing NB might cause a sudden drop if the signal drops suddenly in some coverage gaps.

I guess this can be helpfull for you.

B.R

[muctimonline]

thanks Ghost78 (http://www.finetopix.com/member.php/50791-Ghost78)

Do you know how to use U2000 of Huawei perfectly? Should we check on our system first before we start any testing ? right?

For quality, Low signal strength , just perform testing to know those value . Can not measure on U2000 ???

[Ghost78]

Hi;

first you have to identify the main contributor to drops from KPIs monitoring too, I'm not huawei guy, but it should be U2000 as you said, after that react accordingly.

B.R