Base station and user equipment for mobile communication system

A base station (BS) for a mobile communication system, comprising:

• a transceiver;
• and
• a processor electrically connected to the transceiver, being configured to execute the following operations:
• generating a first downlink reception indication message including a first serving source configuration and a first downlink parameter setting for signal combination, the first serving source configuration indicating a plurality of serving sources;
• transmitting the first downlink reception indication message to a first user equipment (UE) via the transceiver;
• generating a first downlink signal and a second downlink signal based on a first piece of downlink information, wherein the first downlink signal carries a first part of the first piece of downlink information and the second downlink signal carries a second part of the first piece of downlink information;
• transmitting the first downlink signal to the first UE through a first serving source of the serving sources indicated by the first serving source configuration via the transceiver;
• and
• transmitting the second downlink signal to the first UE through a second serving source of the serving sources indicated by the first serving source configuration via the transceivers;
• wherein the first piece of downlink information is a piece of downlink control information (DCI), and the first downlink signal is a first downlink control signal and the second downlink signal is a second downlink control signal so that the first UE combines the first downlink control signal and the second downlink control signal to obtain the piece of downlink control information according to the first downlink parameter setting for signal combination.