MBSR MANAGEMENT METHOD

One disclosure of the present specification provides a method by which a UE communicates. The method comprises the steps of: receiving, from a mobile base station relay (MBSR), MBSR-specific information, which includes a MBSR selection determination timer; performing a first measurement on the MBSR; driving the MBSR selection determination timer on the basis that the result of the first measurement satisfies a cell reselection criteria; performing a second measurement on the MBSR on the basis that the MBSR selection determination timer has expired; and performing cell reselection on the MBSR on the basis that the result of the second measurement satisfies the cell reselection criteria.