| QoS Measurements | |
| Mouseover for more details. | |
| ⚫ CSSR | ◆ SDCCH Cong. |
| ■ DCR | ▲ TCCH Cong. |
| Airtel Data | |
|---|---|
| CSSR | |
| DCR | |
| SDDCH | |
| TCCH | |
| 9mobile Data | |
|---|---|
| CSSR | |
| DCR | |
| SDDCH | |
| TCCH | |
| Globacom Data | |
|---|---|
| CSSR | |
| DCR | |
| SDDCH | |
| TCCH | |
| MTN Data | |
|---|---|
| CSSR | |
| DCR | |
| SDDCH | |
| TCCH | |
The Call Setup Success Rate (CSSR) is calculated by taking the number of the unblocked call attempts divided by the total number of call attempts. A call setup is an exchange of signaling information in the call process that leads to Traffic Channel (TCH) seizure.
Performance Threshold: The CSSR should be equal to or greater than 98%.
| CSSR(%) = | Number of Unblocked Call Attempts |
× 100 |
| Total Number of Call Attempts |
The Dropped Call Rate (DCR) - also called Call Drop Rate - is the number of dropped calls divided by the total number of call attempts. A dropped call is a call that is prematurely terminated before being released normally by either the caller or called party (i.e., the call is dropped before the exchange of Released Message "RL_M" and Released Complete Message "RLC_M" in the signaling flow).
Performance Threshold: The DCR should be equal to or less than 1%.
| DCR(%) = | Number of Prematurely Terminated Calls |
× 100 |
| Total Number of Call Attempts |
The Standalone Dedicated Control Channel Congestion Rate is defined as the probability of failure of accessing a Standalone Dedicated Control Channel (SDCCH) during call set up. The SDCCH is used in the GSM system to provide a reliable connection for signalling and SMS (Short Message Service) messages.
Performance Threshold: The SDCCH Congestion Rate should be equal to or less than 0.2%.
| SDCCH(%) = | Number of Assignment Related Connect Fails |
× 100 |
| Mobile Originating Call Attempts |
The Traffic Control Channel Congestion Rate is the probability of failure of accessing a traffic channel during call setup. Traffic Control Channels (TCCH) are responsible for transferring control information between mobiles and the BTS.
Performance Threshold: The TCCH Congestion Rate should be equal to or less than 2%.
| TCCH(%) = | Number of Call Connect Fails | × 100 |
| Total Number of Call Attempts |