 relation exists only to the cell with PCID 6 When a new neighbor site relation is established, the configuration information of all parented cells is stored in the neighbor cell list. But only the identified and respectively measured neighbor cell is listed as a relation in the neighbor relation table (NRT) between one cell and a neighboring cell of this site. During daily operation, a cell relation could fail to work properly for handovers (i.e., handover performance counters show higher failure rates than average). In this case, optimization algorithms can blacklist a relation. Another possible optimization to the NRT is to mark the neighboring cells that are either under congestion or in temporary outage where handover is not allowed (shown by the field handover allowed in Figure 2-11). By doing this, the system information block (SIB) for the serving cell can be updated to avoid the cell information that is congested or blacklisted. The RRC connection setup and RRC connection reconfiguration messages sent by the serving cell to the UEs can be updated to remove measurement criteria for the cell. This information can also be used when UE reports measurement to the serving cell; if there are multiple reports from the UE, the serving cell can ignore the measurement report for the cell that is marked as handover not allowed and proceed with handover preparations for the other measured cells by the UE. CHAPTER 2 SELF-ORGANIZING NETWORKS IN LTE DEPLOYMENT Neighbor Site and cell List for eNodeB 1 Neighbour E-CGI Ip-address Connection ECGI1 172.168.10.1 ECGI2 172.168.10.1 eNodeB2 ECG13 172.168.10.1 PCI18 ECG14 172.168.10.2 eNode83 PCI19 ECGI5 172.168.10.2 eNodeB4 PCI102 ECGI6 172.168.10.4 Neighbor relation table on eNodeB1 Handover SI No E-CGI X2 Link Allowed Priority ECGI1 ECG12 ECG13 ECGI4 ECGIS ECGI6 Figure 2-11. Neighbor site and cell list and neighbor relation table The NRT can be further optimized to improve the KPIs for a particular neighbor by adding an X2 link if there are too many handovers performed betwee