GPEH Counter analysis

[RFDude_PMA]

Hi all

I need to see if subscribers are connected far away from the cell. Can someone tell me which GPEH messages I need to use? Thanks

[keanchan]

Hi all

I need to see if subscribers are connected far away from the cell. Can someone tell me which GPEH messages I need to use? Thanks

You can use the NBAP Radio Link Setup Request to get the Propagation Delay during call setup. Each unit for the propagation delay is equivalent to 3 chips = 3 * 78.07m.

Hope this help.

/Kean

[RFDude_PMA]

so the value per sector in one hour needs to divided

Distance = Value / 3

Is this correct?

[keanchan]

so the value per sector in one hour needs to divided

Distance = Value / 3

Is this correct?

Hi,
Are you referring to the PM counter or the GPEH event? For the GPEH event, the propagation delay attribute is the delay measure during call setup. To get the distance you will need to multiply with 3*Chip distance (78.07) m

[RFDude_PMA]

Yes I was refering to the GPEH counter... Is a little complicated to process the gpeh.
But know that you mentioned the pm counter I found it in the Prach table, But the values are in an array of 40 bins, but in the Alex do not mention how to get distance from those bins

keenchan.. How can I convert those pm values in to distance..

Thanks Mate for this..

[s52d]

Yes I was refering to the GPEH counter... Is a little complicated to process the gpeh.
But know that you mentioned the pm counter I found it in the Prach table, But the values are in an array of 40 bins, but in the Alex do not mention how to get distance from those bins

keenchan.. How can I convert those pm values in to distance..

Thanks Mate for this..

Without looking in the docs: array[0] gives maximum distance as set with cell parameter,
then array[0] to array[39] gives nr of samples in particular range.
So, values are relative to maximum cell radius/Ue distance.

BR
s52d

[RFDude_PMA]

So If I understand correctly..

Bin distance = Cell radius (utran value) / 40 (amount of bins in the pm..)

Distance = Value(pmcounterpropagationdelay)/ Bin Distance

Is this what you meant?

[turc]

Below is the parameter and the counter related to propagation delay.



TOY> get . cellr

110721-19:19:34 184.132.57.185 7.1u RBS_NODE_MODEL_N_1_4 stopfile=/tmp/12389
=================================================================================================================
MO Attribute Value
=================================================================================================================
RbsLocalCell=S2C1 cellRange 35000
RbsLocalCell=S1C1 cellRange 35000
RbsLocalCell=S3C1 cellRange 35000
=================================================================================================================

TOY> pmom . prop

110721-19:20:45 184.132.57.185 7.1u RBS_NODE_MODEL_N_1_4 stopfile=/tmp/12389

##########################################################################################################
MO Class Pm Counter Type
##########################################################################################################
Prach pmPropagationDelay sequence:long [41]
----------------------------------------------------------------------------------------------------------
Propagation delay for the cell. Propagation delay is measured on RACH messages with correct CRC. A sample is taken from each detected preamble with succesful detected message.
Note!
-If the propagation delay of a RACH message with correct CRC is negative, bin 1 is incremented
-If the propagation delay of a RACH message with correct CRC is larger than the cell range, bin 40 is incremented.
Counter type: PDF
Counter is reset after measurement interval: Yes
Condition: The actual measurement is started when the PRACH is setup.
PDF ranges:
[0]: Maximum delay in number of chips, 0..2562 chips
[1]: Number of samples in range [0..1[ %
[2]: Number of samples in range [1..2[ %
...
[10]: Number of samples in range [9..10[ %
[11]: Number of samples in range [10..12[ %
[12]: Number of samples in range [12..14[ %
...
[20]: Number of samples in range [28..30[ %
[21]: Number of samples in range [30..33[ %
[22]: Number of samples in range [33..36[ %
...
[30]: Number of samples in range [57..60[ %
[31]: Number of samples in range [60..64[ %
[32]: Number of samples in range [64..68[ %
...
[40]: Number of samples in range [96..100[ %
Undefined value: -1
MaxLength=41
**********************************************************************************************************

[turc]

For example if you cellRange is set to 35000 (35KM) you can use the below avg distance for each bin.

Bin AVG_KM AVG_MILE
0 max delay
1 0.35 0.22
2 0.53 0.33
3 0.88 0.54
4 1.23 0.76
5 1.58 0.98
6 1.93 1.20
7 2.28 1.41
8 2.63 1.63
9 2.98 1.85
10 3.33 2.07
11 3.85 2.39
12 4.55 2.83
13 5.25 3.26
14 5.95 3.70
15 6.65 4.13
16 7.35 4.57
17 8.05 5.00
18 8.75 5.44
19 9.45 5.87
20 10.15 6.31
21 11.03 6.85
22 12.08 7.50
23 13.13 8.16
24 14.18 8.81
25 15.23 9.46
26 16.28 10.11
27 17.33 10.77
28 18.38 11.42
29 19.43 12.07
30 20.48 12.72
31 21.70 13.48
32 23.10 14.35
33 24.50 15.22
34 25.90 16.09
35 27.30 16.96
36 28.70 17.83
37 30.10 18.70
38 31.50 19.57
39 32.90 20.44
40 34.30 21.31

[zee86]

For example if you cellRange is set to 35000 (35KM) you can use the below avg distance for each bin.

39 32.90 20.44
40 34.30 21.31

do you have any excel tool for that

[jackkarpar]

i agree with that. there is some difference between the GPEH event and PM counter in calculating propagation delay. And totally, the GPEH's gets a higher resolution. you can get the right answer by combining keanchan's answer and turc's.

Hi,
Are you referring to the PM counter or the GPEH event? For the GPEH event, the propagation delay attribute is the delay measure during call setup. To get the distance you will need to multiply with 3*Chip distance (78.07) m

[MASTuNDA]

Hi ,

Can you please shed some further light on how these distance ranges are calculated....