A data transmission method includes: allocating, based on a power ratio value of near user equipment to far user equipment in two paired user equipments, a transmit power to each of the near user equipment and the far user equipment, where the power ratio value is a ratio in a first ratio set, at least one ratio in the first ratio set can be selected from a second ratio set. A plurality of power ratio values of near user equipment to far user equipment in two paired user equipments can be provided.