RF3G UMTS Call Setup Success Rate (CSSR) Calculator
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In a 3G UMTS (Universal Mobile Telecommunications System) network, the Call Setup Success Rate (CSSR) is a key performance indicator (KPI) that measures the network’s ability to successfully establish voice calls.
Definition
CSSR represents the percentage of call attempts that successfully transition from initiation to connection within a specified time frame. It is an important metric for assessing network reliability, particularly for voice services, and indicates how often users can initiate calls without issues.
Call Setup Success Rate Calculator
Here’s how to calculate CSSR:
EXAMPLE:
- Number of successful call attempts = 950
- Total number of call attempts = 1000
CSSR (Output) = 95
Call Setup Success Rate (CSSR) Formula
Following is the formula to calculate CSSR:
CSSR = (Number_of_successful_call_setups / Total_number_of_call_attempts) x 100
Factors Affecting CSSR
Several factors can impact CSSR, including the following:
- Signal Quality and Coverage: Poor signal strength or high interference can result in call setup failures.
- Congestion: High network load can lead to call setup failures due to resource unavailability.
- Core Network Performance: Failures in the core network, such as issues in call routing or switching, can also reduce CSSR.
- Radio Link Failures: Failures in establishing a stable radio link between the user device and the base station can affect call success.
Target CSSR in UMTS
The target CSSR in a well-optimized UMTS network is typically above 95%, ensuring that most call attempts are successful, providing a reliable experience for users. Maintaining a high CSSR is essential for customer satisfaction, as it directly impacts users’ ability to make calls without interruptions or setup failures.
