# 8.7.5 Outage calculation

Two conditions are counted as outage.

1. A mobile station, which is not able to transmit the required amount of power to meet the received *E<sub data-renderer-mark="true">b</sub>/N<sub data-renderer-mark="true">0</sub>*\_*target* due to maximum power limitations. This mobile is counted as part of the specified traffic load *N\_UL*. However, the mobile is assumed to be transmitting no power.
2. In the case of *Act\_MS* &lt; *N\_UL*, no more mobile stations can be added to the set of active users because of noise rise limits. In this event, *N\_UL* - *Act\_MS* outages are counted.

For each event, the number of optimised users is being re-calculated