PM Counter

PM counters are the raw events the network keeps tallying — number of RRC connection attempts, number of successes, number of abnormal releases, bytes transmitted, and thousands more. Network elements increment them continuously and dump them at a fixed granularity, classically a 15-minute period (a "ROP"), into PM files that the management system collects. Everything downstream — your KPIs, your dashboards, your trend reports — is built from these.

The mental model that keeps you out of trouble: counters are the ingredients, KPIs are the dish. A counter on its own ("23,114 connection attempts this period") rarely means much; it becomes useful when combined into a ratio. Two practical gotchas. First, the granularity period matters — a counter is a count over that window, so comparing periods of different lengths, or a busy hour against a quiet one, needs care. Second, counter definitions are vendor-specific even when the intent is standardized, so the same KPI computed on two vendors' counters can differ unless you've confirmed the definitions line up. TS 28.552 is where 3GPP standardizes the measurement definitions.