ritively lesser. Current load condition of the candidate cell. As a result of cell outage compensation, it very likely that after the compensation procedure is performed, the candidate cells will have a larger coverage area with an increase in the number of users that are served by it. Also the incoming handover ratio can increase for the cell because of the compensation procedure. Care should be taken to ensure that the candidate cells are not already under high load condition with poor KPI performance. Type of the cell. Compensation algorithms will also consider the type of the candidate cell for any outage calculation (i.e., an indoor cell is not typically chosen as a candidate cell for compensation of an outdoor cell). Also, it is important that the candidate cell belongs to the same service provider so the impact to the revenue will be minimal. The advantage of dynamically determining the candidate cells for compensation is that the estimation is more realistic and the risks are less as compared with that of static determination of the candidate cells. However, the time taken for the cell outage compensation will be much higher when performed dynamically. As part of outage compensation, the parameters that are reconfigured on the candidate cells are typically cell mobility parameters, neighbor lists, cell transmit power, and antenna tilt. The tuning is performed in smaller steps and the KPIs are monitored for improvement. The action is stopped once the KPIs are in an acceptable range or the alarm for the outage is cleared. Figure 2-17 presents a flowchart representing the cell outage compensation procedure for central SON. Monitoring Alarms and KPI's for outage Cell Outage detection Select the Candidate List for outage compensation Perform compensation action for the candidate cells in smaller steps rollback evaluate If the compensation effect is causing improvement in KPI This step is performed only till the Outage detection is true but KPI's are improving. Figure 2-17. Cell outage compensation procedure fo