A radio communication method, applied to a terminal device capable of device-to-device communication, the method comprising: obtaining, by the terminal device from a network device, configuration information that indicates a correspondence between an identifier of services and at least one Radio Access Technology, RAT, wherein the identifier of services is a Provider Service Identifier, PSID, or an Intelligent Transportation System Application Identifier, ITS-AID, wherein the method further comprises: determining, by the terminal device, an RAT for transmitting a first service according to the configuration information, wherein the first service belongs to the services; wherein the configuration information indicates that the first service corresponds to a first RAT and a second RAT; the configuration information specifically indicates a correspondence between a Prose Per-Packet Priority, PPPP, of the services and the at least one RAT, wherein the configuration information indicates that data of a first PPPP of the first service corresponds to the first RAT and data of a second PPPP of the first service corresponds to the second RAT; wherein the first RAT is an RAT for a first-type carrier and the second RAT is an RAT for a second-type carrier, wherein the first-type carrier is configured to transmit data on an uplink and the second-type carrier is configured to transmit data on a sidelink; the RAT determined by the terminal device comprises an access layer parameter, and the access layer parameter is whether 64 quadrature amplitude modulation, 64QAM, is used for modulation, and the method further comprises: transmitting, by the terminal device, the first service by using the RAT. obtaining, by the terminal device from a network device, configuration information that indicates a correspondence between an identifier of services and at least one Radio Access Technology, RAT, wherein the identifier of services is a Provider Service Identifier, PSID, or an Intelligent Transportation System Application Identifier, ITS-AID, wherein the method further comprises: determining, by the terminal device, an RAT for transmitting a first service according to the configuration information, wherein the first service belongs to the services; wherein the configuration information indicates that the first service corresponds to a first RAT and a second RAT; the configuration information specifically indicates a correspondence between a Prose Per-Packet Priority, PPPP, of the services and the at least one RAT, determining, by the terminal device, an RAT for transmitting a first service according to the configuration information, wherein the first service belongs to the services; wherein the configuration information indicates that the first service corresponds to a first RAT and a second RAT; the configuration information specifically indicates a correspondence between a Prose Per-Packet Priority, PPPP, of the services and the at least one RAT, wherein the first RAT is an RAT for a first-type carrier and the second RAT is an RAT for a second-type carrier, wherein the first-type carrier is configured to transmit data on an uplink and the second-type carrier is configured to transmit data on a sidelink; the RAT determined by the terminal device comprises an access layer parameter, and the access layer parameter is whether 64 quadrature amplitude modulation, 64QAM, is used for modulation, and the method further comprises: transmitting, by the terminal device, the first service by using the RAT.