Embodiments of the disclosure provide a radio access method, apparatus, and system, which can implement mutual transmission and processing of collaborative data between sites on a basis of low-cost deployment and high availability, and improve network performance. In the method, a basic DU is deployed in a site, and the method may include: receiving, by a switching device, a first data packet sent by a first basic DU; determining to send the first data packet to a second basic DU for collaborative processing; and sending the first data packet to the second basic DU, so that the second basic DU performs collaborative processing on the first data packet and a second data packet, where the second data packet and the first data packet are of a same data type. Embodiments of the disclosure are applicable to the communications field.