DISPOSITIVO DE ESTAÇÃO BASE, DISPOSITIVO DE ESTAÇÃO MÓVEL, SISTEMA DE COMUNICAÇÃO E PROCESSO DE COMUNICAÇÃO

摘要

A base station device which communicates with a mobile station device, comprising an uplink synchronization managing unit which manages uplink synchronization maintenance status of the mobile station device, and a transmitting unit which transmits a synchronization recovery request to the mobile station which is in the uplink synchronization maintenance status.