CSSR and ASR::Core KPIs of the Telecom Mobile Network

Call Setup Success Rate and Answer to Seizure Ratio are the core KPI(Key Performance Indicator) of Telecom Core Wireless Network. These are the parameters based on which the switch performance is adjudged and if they fall the Network quality shows a steep decline.

What is CSSR?
CSSR is calculated by ratio of number of successful calls to the number of call attempts.Call is considered successful once it reaches the called number. The usual acceptable range of the parameter is 90-98%.

What is ASR?
Answered to Seizure ratio is the number of answered calls divided by the number of call attempts, Now here is the catch Successful call is considered as once the call reaches the destination despite the number is busy or is not answering the call still the CSSR will be 1/1 whereas the ASR is 0/1. If the call is answered and the conversation starts than the ASR will be 1/1 CSSR will be still 1/1.

Now how it effects the network if there is a congestion in the network or the routing is wrong the call is anyhow not reaching the called party hence the network management team needs to understand the issue behind the drop in ASR/CSSR as it directly affects the customer experience of the mobile network.

The ASR incase of Fixed line may be similar to wireless network but usually the CSSR is 99.99%. The reason is circuit channel busy or the call drop or call origination and termination is not complex in the fixed line network which is quiet complex in case of wireless network. The main concern area in case of fixed line is ASR whereas the wireless network team has to work on both CSSR and ASR.

ASR and CSSR shows the network quality and the customer experience of the network. If these 2 parameters are benchmarked tracked and kept high the customer experience will be good and hence a mobile network will be considered best in class.

In my upcoming posts I will share the reasons of drop in CSSR and ASR, Steps of Improvement and Interlink between them in Detail.

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