GSM CS Voice Core Network Key Performance Indicators (KPIs)

Here are the key performance indicators (KPIs) specific to GSM Circuit Switched Voice networks and their impact on overall network quality:

1. Call Setup Success Rate (CSSR):
   • Explanation: CSSR measures the percentage of successful call attempts out of the total call attempts. A call is considered successful if the signaling channels (SDCCH) and traffic channels (TCH) are successfully allocated.
   • Impact: High CSSR indicates efficient call setup processes and minimal call blocking, contributing to a positive user experience.
2. Dropped Call Rate (DCR):
   • Explanation: DCR is the percentage of calls that are unintentionally terminated by the network after being successfully established. This can be due to various reasons such as poor signal quality or handover failures.
   • Impact: A low DCR is crucial for maintaining call reliability and user satisfaction. High DCR can lead to frustration and perceived poor network quality.
3. Handover Success Rate (HSR):
   • Explanation: HSR measures the percentage of successful handovers out of the total handover attempts. A handover is the process of transferring an active call from one cell to another without interruption.
   • Impact: High HSR ensures seamless call continuity and mobility, which is essential for users moving across different cell areas.
4. Traffic Channel (TCH) Congestion Rate:
   • Explanation: This KPI measures the percentage of time the traffic channels are congested and unable to handle additional calls.
   • Impact: Low TCH congestion rates indicate that the network has sufficient capacity to handle call volumes, reducing call blocking and improving user experience.
5. Stand-alone Dedicated Control Channel (SDCCH) Congestion Rate:
   • Explanation: This KPI measures the percentage of time the SDCCH is congested. The SDCCH is used for signaling during call setup, SMS delivery, and location updates.
   • Impact: Low SDCCH congestion rates ensure efficient call setup and signaling processes, contributing to overall network performance.

These KPIs are critical for network operators to monitor and optimize, as they directly affect the quality of voice services provided to users. By maintaining high performance in these areas, operators can ensure reliable and satisfactory user experience.