A data transmission method, comprising: sending, by a macro base station, a configuration request message to an access node, wherein the configuration request message comprises a bearer configuration parameter that carries a radio bearer, RB, identifier, so that the access node completes bearer configuration according to the bearer configuration parameter; receiving, by the macro base station, a configuration success message from the access node, wherein the configuration success message carries at least physical layer parameter configuration information that is configured by the access node for a user equipment; and sending, by the macro base station, a reconfiguration message to the user equipment, wherein the reconfiguration message comprises at least the RB identifier and/or a logical channel identifier that is reconfigured to transmit on the access node and the physical layer parameter configuration information of the access node, so that after the user equipment completes physical layer configuration according to the physical layer parameter configuration information, the user equipment sends signaling and/or service data to the access node according to the RB identifier and/or the logical channel identifier that is reconfigured to transmit on the access node; wherein the configuration request message further comprises a first cell radio network temporary identifier, wherein the first cell radio network temporary identifier is the first cell radio network temporary identifier allocated by the macro base station to the user equipment, so that after the user equipment establishes a connection to the access node, the access node transmits data to the user equipment by using the first cell radio network temporary identifier. sending, by a macro base station, a configuration request message to an access node, wherein the configuration request message comprises a bearer configuration parameter that carries a radio bearer, RB, identifier, so that the access node completes bearer configuration according to the bearer configuration parameter; receiving, by the macro base station, a configuration success message from the access node, wherein the configuration success message carries at least physical layer parameter configuration information that is configured by the access node for a user equipment; and sending, by the macro base station, a reconfiguration message to the user equipment, wherein the reconfiguration message comprises at least the RB identifier and/or a logical channel identifier that is reconfigured to transmit on the access node and the physical layer parameter configuration information of the access node, so that after the user equipment completes physical layer configuration according to the physical layer parameter configuration information, the user equipment sends signaling and/or service data to the access node according to the RB identifier and/or the logical channel identifier that is reconfigured to transmit on the access node; wherein the configuration request message further comprises a first cell radio network temporary identifier, wherein the first cell radio network temporary identifier is the first cell radio network temporary identifier allocated by the macro base station to the user equipment, so that after the user equipment establishes a connection to the access node, the access node transmits data to the user equipment by using the first cell radio network temporary identifier.