Abstract
The invention provides a power distribution method in a non-orthogonal multiple access system. The power distribution method is suitable for a base station. The method comprises the following steps: receiving a first channel estimation error parameter from first user equipment, and receiving a second channel estimation error parameter from second user equipment; configuring a first minimum transmission rate demand of the first user equipment and a second minimum transmission rate demand of the second user equipment; determining a power distribution factor according to the first channel estimation error parameter, the second channel estimation error parameter, the first minimum transmission rate demand and the second minimum transmission rate demand; and determining a first transmission power of the first user equipment and a second transmission power of the second user equipment according to the power allocation factor.