Propagation Delay in LTE

[uchok]

Hi all,

Does anyone know how to get info about the propagation delay.
In E// 3G we can check by the counter "pmPropagationDelay". But I couldn't find in E// LTE.

[giegala]

Hi,

please, check these out:
pmRaSuccTa ("Distribution of the measured Timing Advance value at random access.)
pmUeCtxtTa (Distribution of the measured Timing Advance value for UL synchronized UEs)

PDF ranges:
[0]: [0..9]%,
[1]: [10..19]%,
[2]: [20..29]%,
[3]: [30..39]%,
[4]: [40..49]%,
[5]: [50..59]%,
[6]: [60..69]%,
[7]: [70..79]%,
[8]: [80..89]%,
[9]: [90..99]%,
[10]: [100..109]%,
[11]: [110..200]%")

Meaning of %:
Periodically the actual TA of the UEs that are UL synchronized is monitored, one scan performed every 5 seconds. Example: When a sample is measured at 50% it means that an UL synchronized UE has a TA value at 50% of the configured cell range. In this case bin 6 for 50%..59% is increased.

[jayk]

The Name has changed. Propagation delay is a term for 3G but for LTE, Timing Advance is used because UE transmits early accommodating the Air interface delay and Processing delay

[uchok]

Hi thanks for the reply.

I've checked the counter but I don't see any value on the counter.
XXXX> pmx -m 1 . pmRaSuccTa
Object Counter 16:15 16:30 16:45 17:00
EUtranCellFDD=XXXX1 pmRaSuccTa 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0
EUtranCellFDD=XXXX2 pmRaSuccTa 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0
EUtranCellFDD=XXXX3 pmRaSuccTa 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0


XXXX> pmx -m 1 . pmUeCtxtTa
Object Counter 16:15 16:30 16:45 17:00
EUtranCellFDD=XXXX1 pmUeCtxtTa 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0
EUtranCellFDD=XXXX2 pmUeCtxtTa 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0
EUtranCellFDD=XXXX3 pmUeCtxtTa 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0 0,0,0,0,0,0,0,0,0,0,0,0


Are you sure that's the right counter? Do you have any log on that counter that shows value?
Please note this enodeB does have traffic.
CellId #UE:s #Bearers
1 6 6
2 4 4
3 5 5

Hi,

please, check these out:
pmRaSuccTa ("Distribution of the measured Timing Advance value at random access.)
pmUeCtxtTa (Distribution of the measured Timing Advance value for UL synchronized UEs)

PDF ranges:
[0]: [0..9]%,
[1]: [10..19]%,
[2]: [20..29]%,
[3]: [30..39]%,
[4]: [40..49]%,
[5]: [50..59]%,
[6]: [60..69]%,
[7]: [70..79]%,
[8]: [80..89]%,
[9]: [90..99]%,
[10]: [100..109]%,
[11]: [110..200]%")

Meaning of %:
Periodically the actual TA of the UEs that are UL synchronized is monitored, one scan performed every 5 seconds. Example: When a sample is measured at 50% it means that an UL synchronized UE has a TA value at 50% of the configured cell range. In this case bin 6 for 50%..59% is increased.

[giegala]

Hi,

what i see in alex description is that "Scanner: Not included in any predefined scanner". I.e. the counter is not enabled by default. I suppose you have to add it to user-defined scanner profile and enable the profile to have it collected. Pls, refer to E/// documentation how to do it.

Cheers!

[uchok]

It's already in user-defined scanner, the counter is activated.
XXXX> pgets
================================================================================
38 USERDEF.eNODEB.Profile=1234.Continuous=Y.STATS ACTIVE 900 15503
================================================================================
Ip 8
pmNoOfHdrErrors
pmNoOfIpAddrErrors
pmNoOfIpForwDatagrams
pmNoOfIpInDiscards
pmNoOfIpInReceives
pmNoOfIpOutDiscards
pmNoOfIpReasmOKs
pmNoOfIpReasmReqds

EUtranCellFDD 14391
pmActiveDrbDlSum
pmActiveDrbDlSumQci [256]
pmActiveDrbUlSum
pmRaSuccTa [12]
pmUeCtxtTa [12]

I don't think that's the counter. But thanks for replying.
Is there some one else know or have any suggestion about propagation delay in LTE E//?

Hi,

what i see in alex description is that "Scanner: Not included in any predefined scanner". I.e. the counter is not enabled by default. I suppose you have to add it to user-defined scanner profile and enable the profile to have it collected. Pls, refer to E/// documentation how to do it.

Cheers!

[rahulinindia]

these counter will report values after activation of optional feature"Enhanced Cell ID in Traces".

[uchok]

Hi Rahul,

Thanks for the information.
Do you have any example printout for those counters? with value ofcourse.

these counter will report values after activation of optional feature"Enhanced Cell ID in Traces".

[riverstreamer]

just to complete rahulinindia's guide ;
that feature need a license which should be requested; it is not in basic license series provided by E///

[riverstreamer]

one remark about the COUNTER (not the feature) :

this counter is not supported unto current release L14A, even it exist in SW.
It is non supported yet. it doesn't work even if it is not GA.
you should wait to have it in the operational.