| CPC H04W 48/20 (2013.01) [H04W 36/0069 (2018.08); H04W 36/087 (2023.05); H04W 24/10 (2013.01); H04W 36/00835 (2018.08); H04W 84/042 (2013.01); H04W 92/20 (2013.01)] | 25 Claims |

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1. A method performed by a first next generation Node B, (gNB), the method comprising:
transmitting a message to a second gNB, wherein the message includes neighbor information related to the first gNB;
transmitting, to the second gNB, a request to add the second gNB as a secondary base station; and
receiving, from the second gNB, a request of a change of the secondary base station from the second gNB to a third gNB.
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