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IMS_Core::Dimensioning_Tool
Estimate the required capacity and node count for your IMS Core network. Calculate BHCA, CPS, and concurrent session requirements for VoLTE and VoNR deployments.
Traffic_Assumptions
1.5 = 50% buffer
Total_BHCA
800,000
Target_CPS
222.22
Calls_Per_Second
Concurrent_Sessions
26,666
IMS Core sizing is the process of estimating the computational and network resources required to handle peak signaling traffic in a VoLTE/VoNR network. It involves calculating Busy Hour Call Attempts (BHCA) to determine the number of P/I/S-CSCF instances needed for high availability (N+1 or N+M).
Technical Contextual Intelligence
In a production IMS environment, signaling capacity must be dimensioned for the "Worst Case" peak hour. This includes mass-restart scenarios (e.g., after power failure) where registration storms can overwhelm the I-CSCF and S-CSCF.
Standard IMS deployments use Geometric redundancy or Pool-based scaling. A redundancy factor of 1.5 to 2.0 is common to ensure that if one site or major node fails, the remaining nodes can handle the traffic without clipping.