Embodiments provide an information transmission method, a base station, user equipment, and a system, which relate to the field of information transmission. The method includes: determining, by a network device, according to a correspondence between a characteristic parameter and a resource configuration, a first resource configuration corresponding to a characteristic parameter of the user equipment, wherein the characteristic parameter of the user equipment comprises a reference signal received power range, and the first resource configuration comprises one or more types of the following sub-configurations: a random access preamble format configuration, and a narrowband resource configuration; and determining, by the network device, a resource according to the first resource configuration, and performing, information sending or receiving with the user equipment by using the resource.