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ayman.absi
2014-02-19, 06:56 AM
Hello,

I'm trying to create a formula for HSDPA MAC Efficiency in Huawei. I created below formula but it gives very values for local cell (between 75% and 85%).


HSDPA MAC Efficiency = 100* VS.AckFirst/(VS.AckTotal + VS.AckRemain)

My questions:

Is this formula correct? If not, could you please share the correct one?
What is the good value for this KPI (eg. more than 80% or more than 90%, etc...)



Thanks,
eritelecom
2014-02-20, 09:29 PM
Salem Aymen,

I think u must use VS.NackTotal instead of VS.AckRemain
ayman.absi
2014-02-20, 11:43 PM
Salem Aymen,

I think u must use VS.NackTotal instead of VS.AckRemain

OK. Your're right so the total attempts will be (VS.AckTotal + VS.NackTotal)

what about the value of this KPI, how much it should be in optimum networks?
ninjafine
2014-02-21, 03:03 AM
OK. Your're right so the total attempts will be (VS.AckTotal + VS.NackTotal)

what about the value of this KPI, how much it should be in optimum networks?

Hi!
In E// there are few types of "efficiency".
1 - HSDPA usage efficiency.
This formula gives percentage of time data is transmitted on HS-DSCH, when there is data to transmit in the RBS buffers.
Normally this KPI is very close to 100%.


2 - HSDPA usage.
This formual gives the percentage of time when RLC buffers in the RBS has to transmit on HS-DSCH.
If the HSDPA usage is in the range 90 - 100% the throughput limitation most likely is depending on the radio, otherwise the small HSDPA usage indicates some TCP/Application limitation on the way from the server to the RBS.


3 - HSDPA Ack Ratio.
Normally this KPI is very close to 90%.
Lower values indicates that scheduler is not working on optimum algorithm.
ayman.absi
2014-02-21, 04:02 AM
@ninjafine (http://www.finetopix.com/member.php?64397-ninjafine)

Thank you for these information. I think KPI no. 3 (HSDPA Ack Ratio) is the one we are speaking about.
Could you please provide the formula of it in E///?
Also, does this KPI reflect the MAC-HS Re-transmission Rate?

Thanks,
ninjafine
2014-02-21, 05:28 AM
@ninjafine (http://www.finetopix.com/member.php?64397-ninjafine)

Thank you for these information. I think KPI no. 3 (HSDPA Ack Ratio) is the one we are speaking about.
Could you please provide the formula of it in E///?
Also, does this KPI reflect the MAC-HS Re-transmission Rate?

Thanks,

For MAC-hs retransmission KPI HS_Retransmission_Overhead is proposed.
The KPI defines the retransmission overhead on MAC-hs level.
HSDPA Retransmission Overhead = 100*(pmSumTransmittedBitsSpiXX - pmSumAckedBitsSpiXX)/pmSumTransmittedBitsSpiXX
The KPI is close to 10%-12%.
khurrambilal01
2014-02-22, 03:05 AM
Hi!
In E// there are few types of "efficiency".
1 - HSDPA usage efficiency.
This formula gives percentage of time data is transmitted on HS-DSCH, when there is data to transmit in the RBS buffers.
Normally this KPI is very close to 100%.


2 - HSDPA usage.
This formual gives the percentage of time when RLC buffers in the RBS has to transmit on HS-DSCH.
If the HSDPA usage is in the range 90 - 100% the throughput limitation most likely is depending on the radio, otherwise the small HSDPA usage indicates some TCP/Application limitation on the way from the server to the RBS.


3 - HSDPA Ack Ratio.
Normally this KPI is very close to 90%.
Lower values indicates that scheduler is not working on optimum algorithm.

Thanks for sharing, Do we have similar KPIs in Huawei? Can anyone share the formula?