2G CSSR

[Kalvera]

Does anybody know what is 2G CSSR as per GSM specs? or have relative spec document?

[mbouchamekh]

CSSR = Call Setup Seccess Ratio

[RF engineer]

There are two formula
1-CSSR=(1-SDCCH drop rate)*TCH assignment success rate.
2-CSSR=immediate assignment success rate*TCH assignment sucess rate*(1-SDCCH drop rate).
BR
RF

[justdream]

There are two formula
1-CSSR=(1-SDCCH drop rate)*TCH assignment success rate.
2-CSSR=immediate assignment success rate*TCH assignment sucess rate*(1-SDCCH drop rate).
BR
RF

can you please tell me what's the definition of Imm_Ass_No_Seiz_Rate?
and how to optimize it?

[RF engineer]

I really donot know what is the definition can please tell me which vendor you use and how to ootimise immediate assignment check you donot have coverage problem , no Bcch interference, no co bcch/bsic , change radio parameter that has effect on RACH , access min change if you have for Rach in order to solve rach phantom

[Processor]

For Alcatel,

(1-SD Drop Rate) * (1- RTCH Assignment Radio Failure Rate – RTCH Assignment BSS Failure – RTCH Assignment Prep BSS Failure Rate – RTCH Assignment Congestion Failure Rate)