A.70 Monitor of paging performance

28.5523GPP5G performance measurementsManagement and orchestrationRelease 18TS

In NR, Paging is under the control of the 5GC or NG-RAN (aka RAN initiated paging and CN initiated paging). When the 5GC wants to page (CN initiated paging) a UE, it has to page it in all cells that belong to the TA(s) to which the UE is registered.

The paging load per cell and gNB is an important measure for the operator as it allows the operator to properly dimension the resources for paging in the NR Cell and gNB.

At an NR Cell and gNB it makes sense to measure the number of discarded paging messages if this is due to some problem in the gNB, such as paging occasion overflow. In that scenario the periodicity of paging occasions can be reconfigured in order to ensure that all paging messages are transmitted by the gNB in the first available paging occasion, thereby avoiding paging delays and extended call setup delay.

Operators need to know when such an event occurs, in order to identify if the problem is at the NR cell or gNB level or not.

In addition to discarded paging records measurement, it is important to know total paging records received so that discarded paging records ratio can be derived.

Total number of paging records received is important in the sense that, it may be fine if the discarded paging records are high if discarded paging records ratio is small. On the other hand, it may be problematic if discarded paging records are low, if discarded paging records ratio turn out to be high.