BASE STATION APPARATUS, MOBILE STATION APPARATUS, AND COMMUNICATION METHOD

摘要

A mobile station (MS) obtains a parameter, performs transmission of a preamble, and sets a counter incremented based on transmission of the preamble. The MS is able to indicate a random access problem corresponding to one transmission timing cell group in a case where the counter reaches the parameter+1 and the transmission of the preamble is performed on the one transmission timing cell group, where the one transmission timing cell group being one of the plurality of transmission timing cell groups, and the MS is able to not indicate a random access problem corresponding to another transmission timing cell group in a case where the counter reaches the parameter+1 and the transmission of the preamble is performed on the another transmission timing cell group, where the another transmission timing cell group being one of the plurality of transmission timing cell groups.

主权项

1. A base station apparatus applied to a mobile communication system in which a plurality of cells are allocated to a mobile station apparatus, the plurality of cells being grouped into a plurality of cell groups, the base station apparatus comprising:
control circuitry configured to and/or programmed to perform both of a contention based random access procedure from the mobile station apparatus and a non-contention based random access procedure from the mobile station apparatus, wherein both of the contention based random access procedure and the non-contention based random access procedure corresponds to at least one of the cells which belongs to a first cell group of the plurality of the cell groups, and the control circuitry further configured to and/or programmed to perform a non-contention based random access procedure from the mobile station apparatus, wherein the non-contention based random access procedure corresponds to at least one of the cells belonging to a second cell group other than the first cell group.