Call Drop Analysis

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Ronney   钻石会员    发表于 2014-5-30 20:31:46   最新回复:2018-05-30 20:08:13

Principle of Call Drop


There are two types of call drop: signaling plane call drop and user plane call drop:

Signaling plane call drop means RNC will send the message “IU RELEASE REQUEST” to CN after CN receives the “IU connection setup complete” 

User plane call drop means RNC will send the message”RAB release request “to CN after CN receives the “RAB setup complete”


Formula of Signaling Plane Call Drop Rate:


 The formula of Call Drop Rate of CS Signaling Plane:

Call Drop Rate of CS Signaling Plane = RNC-originated CS Domain Iu Connection Release / RNC-originated CS Domain Iu

Connection Setup Success× 100% 


The formula of Call Drop Rate of PS Signaling Plane:

Call Drop Rate of PS Signaling Plane = RNC-originated PS Domain Iu Connection Release / RNC-originated PS Domain Iu

Connection Setup Success× 100%.


Cause of Signaling Plane call drop

 Usually, the typical causes for sending the IU_release
message are as follows:
OM intervention
Repeated integrity checking failure
RNC generated signaling connection release
RL out-of-synchronization

Formula of User Plane Call Drop Rate

 The formula of Call Drop Rate of CS User Plane:

 Call Drop Rate of CS User Plane = RNC-originated CS Domain RAB Release / RNC-originated CS Domain RAB Setup Success × 100%

 The formula of Call Drop Rate of PS User Plane:

 Call Drop Rate of PS User Plane = RNC-originated PS Domain RAB Release / RNC-originated PS Domain RAB Setup Success × 100%


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manmadh   小试牛刀    发表于 2014-9-22 16:27:35

Useful message Thank you.. 
s_kumar   白金会员    发表于 2014-5-30 20:55:17

Very much important for those who want to check 3G Cell performance..  many thanks
khizir   银牌会员    发表于 2014-5-30 21:45:58

Really like it.. very useful for my job .                              
user_2837311   钻石会员    发表于 2018-5-30 13:52:34

useful document, thanks
Have a nice day
c.deiana   高级会员    发表于 2018-5-30 20:08:13

Saved it!
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