Step by step Neighbour Relation creation (Swap) - Example Site X - For 2G system :1. Inform other vendor team to create our site X cell data in their system as external cell (So later their system can recognized site X cell as neighbour candidate - 2G only)2. Define which of other vendor cells we want to make neighbour to our site X cell (So later site X cell have target for HO to their system - 2G only)3. In our BSC, create other vendor cell data as external cell in our system (So later our system can recognized their cell as neighbour candidate - 2G only)4. In our BSC, create neighbour relation between sector in site X (2G to 2G)5. In our BSC, create neighbour relation from site x cell to already define other vendor cell in step 2 (2G to 2G)6. In our BSC, create our 3G cell data as external cell (So later our 2G cell can recognized our 3G cell as neighbour candidate - 2G to 3G)7. In our BSC, create neighbour relation between sector X cell 2G to its surrounding 3G cell (Also itself if it have 3G system) which we want to make the neighbour (2G to 3G)8. In our RNC, create our 2G cell data as external cell (So later our 3G cell can recognized our 2G cell as neighbour candidate - 3G to 2G)9. In our RNC, create neighbour relation between its surrounding 3G cell to sector X cell 2G (Also from itself if it have 3G system) to make incoming HO from 3G system possible (3G to 2G)