A signal transmission method, comprising: receiving, by a terminal, a synchronization signal sent by a network side device; determining, by the terminal, a beam Identifier and at least part of cell ID according to the synchronization signal; and transmitting, by the terminal, a subsequent signal according to the beam ID and/or the at least part of the cell ID; wherein the synchronization signal comprises a first synchronization signal and a second synchronization signal; and determining, by the terminal, the beam ID and the at least part of cell ID according to the synchronization signal comprises: determining, by the terminal, the at least part of the cell ID according to sequence information of the synchronization signal; and characterized by: determining, by the terminal, the beam ID according to a number of transmission time units spaced between a first transmission time unit and a second transmission time unit as well as a corresponding relationship between a number of transmission time units and a beam ID, wherein the first transmission time unit is a transmission time unit for transmitting the first synchronization signal, and the second transmission time unit is a transmission time unit for transmitting the second synchronization signal. receiving, by a terminal, a synchronization signal sent by a network side device; determining, by the terminal, a beam Identifier and at least part of cell ID according to the synchronization signal; and transmitting, by the terminal, a subsequent signal according to the beam ID and/or the at least part of the cell ID; wherein the synchronization signal comprises a first synchronization signal and a second synchronization signal; and determining, by the terminal, the beam ID and the at least part of cell ID according to the synchronization signal comprises: determining, by the terminal, the at least part of the cell ID according to sequence information of the synchronization signal; and characterized by: determining, by the terminal, the beam ID according to a number of transmission time units spaced between a first transmission time unit and a second transmission time unit as well as a corresponding relationship between a number of transmission time units and a beam ID, wherein the first transmission time unit is a transmission time unit for transmitting the first synchronization signal, and the second transmission time unit is a transmission time unit for transmitting the second synchronization signal. determining, by the terminal, the at least part of the cell ID according to sequence information of the synchronization signal; and characterized by: determining, by the terminal, the beam ID according to a number of transmission time units spaced between a first transmission time unit and a second transmission time unit as well as a corresponding relationship between a number of transmission time units and a beam ID, wherein the first transmission time unit is a transmission time unit for transmitting the first synchronization signal, and the second transmission time unit is a transmission time unit for transmitting the second synchronization signal. determining, by the terminal, the beam ID according to a number of transmission time units spaced between a first transmission time unit and a second transmission time unit as well as a corresponding relationship between a number of transmission time units and a beam ID, wherein the first transmission time unit is a transmission time unit for transmitting the first synchronization signal, and the second transmission time unit is a transmission time unit for transmitting the second synchronization signal.