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# GSM/KPI

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• #60351 Reply
pc
Guest

How calculate the TCH accessibility.

#60352 Reply
Pc
Guest

How to calculate the TCH accessibility.pls help me any body.
thank you.

#60353 Reply
Bijoy
Guest

What is your vendor?

#60354 Reply
Pc
Guest

Hi Bijoy
Thats ZTE

#60355 Reply
Mak
Guest

In my point of view TCH accessibility is directly proportional to TCH blocking. As you improve the TCH blocking your TCH accessibility will improve

#60356 Reply
pc
Guest

Hi Mak
Is there any equation to calculate the TCH blocking for ZTE

#60357 Reply
Paras
Guest

Hi,
Formula for TCH blocking is :
number of TCH seizure failure * 100 / number of TCH seizure attempt

#60358 Reply
Akramots
Guest

Hi all,
It is not 100% true.
There could be losses not only due to blocking (SDCCH, TCH, ABIS, A …) but also due to HW failure. For example: in case of cross connected Antennas between sectors, or one of TRX could be damaged.

#60359 Reply
Paras
Guest

Hi Akramots,

that’s true, failure can be due to various reasons, but all these will come in failure part
the formula i have given is a general formula

#60360 Reply
k. srinivasa Raju
Guest

Hi, Please give me tips for improving sd drop. ( Here we are using NOKIA system ) Mainly for overshooting cells what whould be the parameters that I need to look for…

#60361 Reply
Ahmed
Guest

please explain KPI in details to me?

#60362 Reply
Kamrul Hasan
Guest

NumTermCalls = ?

#60363 Reply
Prabeen
Guest

Hi Srinivasa,

Is the Cells with high SD Drop a border Cell? Check out ur CRH value. Try to increase ur CRH value to 8 if not. This may reduce ur LU.

But Bijoy,

Could u explain me wat exactly is definition of TCh Blocking and SD Blocking. Wats teh difference btw Blocking, Congestion and drop.

#60364 Reply
srinivas
Guest

Hi Prabeen,
Thanks for the suggestion. A small elaboration on CRH will be helpful. We use NOKIA system here and there is no results for CRF in NED..

Please suggest.

#60365 Reply
KJB
Guest

Hi Sirnivas!

CRH (Cell Reselect Hysteresis),You need to search HYS in NED.

Default value is 4,Can be increases as per requirement.

BR..
KJB

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