A signal transmission method, wherein transmission of a Synchronization Signal, SS, block occupies M Physical Resource Blocks, PRBs, a Zero Power Channel State Information Reference Signal, ZP CSI-RS, is located on N PRBs, the N PRBs comprise a first PRB and/or a second PRB, the first PRB is partially overlapped with a maximum-frequency PRB in the M PRBs, and the second PRB is partially overlapped with a minimum-frequency PRB in the M PRBs, M and N being positive integers; and in a case where the ZP CSI-RS is located on a symbol occupied by the SS block, the method comprises: determining, by a terminal device, that at least one first Resource Element, RE, does not comprise the ZP CSI-RS or determining, by the terminal device, that the at least one first RE comprises the ZP CSI-RS, the at least one first RE being at least one RE, except one or more REs overlapped with the maximum-frequency PRB in the M PRBs, in the first PRB, and/or, the at least one first RE being at least one RE, except one or more REs overlapped with the minimum-frequency PRB in the M PRBs, in the second PRB; wherein transmission of a Primary Synchronization Signal, PSS, in the SS block occupies L PRBs, the N PRBs comprise a third PRB and/or a fourth PRB, the third PRB is partially overlapped with a maximum-frequency PRB in the L PRBs, and the fourth PRB is partially overlapped with a minimum-frequency PRB in the L PRBs, L being a positive integer smaller than M, and in a case where the ZP CSI-RS is located on a symbol occupied by the PSS, the method further comprises: determining, by the terminal device, that at least one second RE does not comprise the ZP CSI-RS or determining, by the terminal device, that the at least one second RE comprises the ZP CSI-RS, the at least one second RE being at least one RE, except one or more REs overlapped with the maximum-frequency PRB in the L PRBs, in the third PRB, and/or, the at least one second RE being at least one RE, except one or more REs overlapped with the minimum-frequency PRB in the L PRBs, in the fourth PRB. determining, by a terminal device, that at least one first Resource Element, RE, does not comprise the ZP CSI-RS or determining, by the terminal device, that the at least one first RE comprises the ZP CSI-RS, the at least one first RE being at least one RE, except one or more REs overlapped with the maximum-frequency PRB in the M PRBs, in the first PRB, and/or, the at least one first RE being at least one RE, except one or more REs overlapped with the minimum-frequency PRB in the M PRBs, in the second PRB; wherein transmission of a Primary Synchronization Signal, PSS, in the SS block occupies L PRBs, the N PRBs comprise a third PRB and/or a fourth PRB, the third PRB is partially overlapped with a maximum-frequency PRB in the L PRBs, and the fourth PRB is partially overlapped with a minimum-frequency PRB in the L PRBs, L being a positive integer smaller than M, and in a case where the ZP CSI-RS is located on a symbol occupied by the PSS, the method further comprises: determining, by the terminal device, that at least one second RE does not comprise the ZP CSI-RS or determining, by the terminal device, that the at least one second RE comprises the ZP CSI-RS, the at least one second RE being at least one RE, except one or more REs overlapped with the maximum-frequency PRB in the L PRBs, in the third PRB, and/or, the at least one second RE being at least one RE, except one or more REs overlapped with the minimum-frequency PRB in the L PRBs, in the fourth PRB. determining, by the terminal device, that at least one second RE does not comprise the ZP CSI-RS or determining, by the terminal device, that the at least one second RE comprises the ZP CSI-RS, the at least one second RE being at least one RE, except one or more REs overlapped with the maximum-frequency PRB in the L PRBs, in the third PRB, and/or, the at least one second RE being at least one RE, except one or more REs overlapped with the minimum-frequency PRB in the L PRBs, in the fourth PRB.