a first signaling bearer identifier, a Media Access Control layer configuration parameter used by the distributed unit to establish a first signaling bearer, a physical layer configuration parameter used by the distributed unit to establish the first signaling bearer, a logical channel configuration parameter used by the distributed unit to establish the first signaling bearer, and first signaling bearer user plane transmission path establishment information on a centralized unit side.
Further, the sending module 1503 sends the first signaling bearer configuration information through the second message.
Further, the receiving module 1501 is further configured to receive first signaling bearer user plane transmission path establishment information that is on a distributed unit side and that is sent by the distributed unit.
Further, the receiving module 1501 is specifically configured to:
receive the first signaling bearer user plane transmission path establishment information on the distributed unit side through the third message.
Further, the sending module 1503 is further configured to:
send a fourth message to the distributed unit, where the fourth message includes at least one of the following information: a cell identifier, second signaling bearer configuration information, and second signaling bearer user plane transmission path establishment information on the centralized unit side.
The receiving module 1501 is further configured to: