| 摘要 |
A secondary base station (2), while cooperating with the first master base station (1) to provide a radio terminal with a secondary cell group (SCG) for DC, receives an SeNB addition request message from a second master base station (3). Said SeNB addition request message indicates whether or not the secondary base station (2) is maintaining each of one or more bearers previously configured in the secondary base station (2) for DC with the first master base station (1). By this means, it is possible, for example, to contribute to performing a change procedure of the master base station in dual connectivity (DC) by using signaling messages between base stations and an existing inter-base station interface procedure. |
