An information transmission method comprising: receiving, by a network-side device, information about a type or a capability level of a power amplifier PA reported by a user equipment UE, wherein the information about the type or the capability level of the power amplifier PA is carried in a field RF-Parameters of a signaling UE-EUTRA-Capability for reporting UE capability information; determining, by the network-side device power back-off values desired for the UE to meet an out-of-band radiation requirement in available uplink resource allocation modes, in accordance with the information about the type or the capability level of the PA reported by the UE, and determining whether each of the available uplink resource allocation modes meets a service transmission requirement of the UE in accordance with the power back-off values or not, determining discontinuous reception DRX configuration information to be transmitted to the UE, in accordance with the information about the type or the capability level of the PA reported by the UE; selecting, by the network-side device from the available uplink resource allocation modes, an uplink resource allocation mode that meets the service transmission requirement of the UE; determining, by the network-side device, the power back-off value desired for the UE to meet the out-of-band radiation requirement in the selected uplink resource allocation mode as the power back-off value to be transmitted to the UE; and transmitting (403, 603, 703), by the network-side device, information about the power back-off value to be transmitted to the UE, and the information about the selected uplink resource allocation mode and the discontinuous reception DRX configuration information to the UE. receiving, by a network-side device, information about a type or a capability level of a power amplifier PA reported by a user equipment UE, wherein the information about the type or the capability level of the power amplifier PA is carried in a field RF-Parameters of a signaling UE-EUTRA-Capability for reporting UE capability information; determining, by the network-side device power back-off values desired for the UE to meet an out-of-band radiation requirement in available uplink resource allocation modes, in accordance with the information about the type or the capability level of the PA reported by the UE, and determining whether each of the available uplink resource allocation modes meets a service transmission requirement of the UE in accordance with the power back-off values or not, determining discontinuous reception DRX configuration information to be transmitted to the UE, in accordance with the information about the type or the capability level of the PA reported by the UE; selecting, by the network-side device from the available uplink resource allocation modes, an uplink resource allocation mode that meets the service transmission requirement of the UE; determining, by the network-side device, the power back-off value desired for the UE to meet the out-of-band radiation requirement in the selected uplink resource allocation mode as the power back-off value to be transmitted to the UE; and transmitting (403, 603, 703), by the network-side device, information about the power back-off value to be transmitted to the UE, and the information about the selected uplink resource allocation mode and the discontinuous reception DRX configuration information to the UE.