US Patent No. 10,433,340

BASE STATION APPARATUS, MOBILE STATION APPARATUS, AND COMMUNICATION METHOD


Patent No. 10,433,340
Issue Date October 01, 2019
Title Base Station Apparatus, Mobile Station Apparatus, And Communication Method
Inventorship Yasuyuki Kato, Sakai (JP)
Katsunari Uemura, Sakai (JP)
Shoichi Suzuki, Sakai (JP)
Assignee SHARP KABUSHIKI KAISHA, Osaka-Shi, Osaka (JP)

Claim of US Patent No. 10,433,340

1. A mobile station apparatus applied to a mobile communication system in which a plurality of cells are allocated to the mobile station apparatus, the plurality of cells grouped into a plurality of cell groups, the mobile station apparatus comprising:control circuitry configured to and/or programmed to perform both of a contention based random access procedure to a base station apparatus and a non-contention based random access procedure to the base 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,
the control circuitry further configured to and/or programmed to perform a non-contention based random access procedure to the base 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,
the control circuitry further configured to and/or programmed to:
indicate a random access problem corresponding to the first cell group in a case where a number of transmissions of a random access preamble exceeds a maximum number of retransmissions, and
not indicate a random access problem corresponding to the second cell group in a case where the number of transmissions of a random access preamble exceeds the maximum number of retransmissions.