CNBAP Load?

[jayk]

Hi Experts, I came to a new term to measure Load of NodeB in 3G network - "CNBAP". Someone please explain CNBAP, its thresholds and methods to tackle high loads. Regards, jack.

[usama0795]

maybe some tranmission guy can help u out....since CNBAP is part of RAN ATM Connection....

Attachment 28687

[blueee]

maybe some tranmission guy can help u out....since CNBAP is part of RAN ATM Connection....

Attachment 28687

Hi,

How to calculate the CNBAP nodeB signalling loading?

IUB RL setup attempt + IUB RL add attempt + IUB RL recong attempt ??


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[jayk]

My observation was that CNBAP being used to measure the NodeB load or the NodeB board load, but could find much details.

[kakayanu]

In HUAWEI, we used formula :

Busy Hour CNBAP = 2 * (VS.IUB.AttRLSetup + VS.IUB.AttRLAdd + VS.IUB.AttRLRecfg*2) /3600s
CNBAP Capacity = 120 CNBAP/s for 2 WBBP (RAN 13)

CNBAP Util = Busy Hour CNBAP/CNBAP Capacity

we used "safety" threshold about 80%, if CNBAP util already reach/above 80% , usually we proposed add more WBBP board to add CNBAP capacity.

thanks.

[blueee]

In HUAWEI, we used formula :

Busy Hour CNBAP = 2 * (VS.IUB.AttRLSetup + VS.IUB.AttRLAdd + VS.IUB.AttRLRecfg*2) /3600s
CNBAP Capacity = 120 CNBAP/s for 2 WBBP (RAN 13)

CNBAP Util = Busy Hour CNBAP/CNBAP Capacity

we used "safety" threshold about 80%, if CNBAP util already reach/above 80% , usually we proposed add more WBBP board to add CNBAP capacity.

thanks.

Thanks.
Currently, we are using slightly different of monitor threshold with "1.7" times factor.

Hourly MAX CNBAP = 1.7*(VS.IUB.AttRLSetup + VS.IUB.AttRLAdd + VS.IUB.AttRLRecfg*2) /3600
with 70% of safety threshold.

Can slot in UTRP card to improve the capability
1 WBBP - 60 CNBAP/s
2 WBBP - 120 CNBAP/s
3 WBBP - 170 CNBAP/s
4 WBBP - 170 CNBAP/s
3 WBBP + UTRP - 180 CNBAP/s
4 WBBP + UTRP - 240 CNBAP/s


/br

[kakayanu]

Thanks.
Currently, we are using slightly different of monitor threshold with "1.7" times factor.

Hourly MAX CNBAP = 1.7*(VS.IUB.AttRLSetup + VS.IUB.AttRLAdd + VS.IUB.AttRLRecfg*2) /3600
with 70% of safety threshold.

Can slot in UTRP card to improve the capability
1 WBBP - 60 CNBAP/s
2 WBBP - 120 CNBAP/s
3 WBBP - 170 CNBAP/s
4 WBBP - 170 CNBAP/s
3 WBBP + UTRP - 180 CNBAP/s
4 WBBP + UTRP - 240 CNBAP/s


/br

thanks bro..btw do you have docs to explained CNBAP capability with configured WBBP(+UTRP)?

[jayk]

@Kakayanu, @Blueee . Appreciate your comments. Please share Huawei's document supporting your comments.

[kakayanu]

dear blueee,

how much capacity if we use: 2WBBP+1 UTRP? only 120 CNBAP/s or..? because you didnt mention below configs..we have NodeB with those spec (2 WBBP+1 UTRP)

Thanks.
Currently, we are using slightly different of monitor threshold with "1.7" times factor.

Hourly MAX CNBAP = 1.7*(VS.IUB.AttRLSetup + VS.IUB.AttRLAdd + VS.IUB.AttRLRecfg*2) /3600
with 70% of safety threshold.

Can slot in UTRP card to improve the capability
1 WBBP - 60 CNBAP/s
2 WBBP - 120 CNBAP/s
3 WBBP - 170 CNBAP/s
4 WBBP - 170 CNBAP/s
3 WBBP + UTRP - 180 CNBAP/s
4 WBBP + UTRP - 240 CNBAP/s


/br

[paulus]

Hi..

Somebody has for HBBU and EBBC in DBS3800 huawei?

Please share...

Thanks..