TCH建立成功率公式怎么算？

谢谢回答，但我想知道具体的指标公式,帮我分析下面这公式可准确：
【CA313:Successful Assignments -（ A3100K:Assignment Requests (Signaling Channel) SDCCH +  A3100A:Assignment Requests (Signaling Channel) TCH   - A312S:Failed Assignments (Signaling Channel) +   CA310A:Assignment Requests (TCH Assigned Repeatedly over A Interface)  - CA312A:Failed Assignments (TCH Assigned Repeatedly over A Interface)】*100% /A3039J:SDCCH Seizures for Speech Service+A301F:TCHF Seizures for Speech Service+A301HH:TCHH Seizures for Speech Service

http://blog.catr.cn/index.php?action/viewspace/itemid/384817

看看这篇文章吧

[TCH呼叫占用成功次数/TCH呼叫占用请求次数]*100%

【TCH占用次数/TCH试呼次数】*100%