he network to maintain flexibility within the network. Broadly, the neighbor relation management can be classified into two main steps: commissioned neighbor cell configurations and automatic neighbor relation updates. Commissioned Neighbor Cell Configurations This step deals with offline planning of the cells and its neighbors with the help of network planning tools. The operator may have minimal needs to plan for the IP addresses and the base station IDs or cell IDs for all the configured adjacent neighboring base stations or cells. The neighbor configuration can be static and does not require any assistance from the UE or other network elements. During the startup of the base station, the commissioned parameters should be read, and X2 connections should be established to all the commissioned neighboring base stations. The remaining cell configuration information can be exchanged between the two base stations via the X2 link formed. Typically, a single X2 connection is established between two base stations regardless of the number of supported cells for each of these base stations. This means all cells, each of them assigned with a unique global cell ID, have the same X2 IP address. If a newly deployed eNodeB has all the commissioning data, these will include the configuration data it runs from the X2 setup procedure to each configured neighbor. When the connection could be established successfully (e.g., the listed neighbor is already installed and commissioned), all required neighbor information can be exchanged between the two eNodeBs. If a listed neighbor does not respond, it can be marked as not reachable. When a base station in operational mode receives an X2 setup request from another base station, it typically should respond to the request, send its own cell configuration data, store the received configuration information in its own neighbor cell list, and mark it as reachable. If the requesting base station for the X2 setup procedure is already known and neighbor configuration information is available 