A downlink transmission method, comprising: determining (S210), by a terminal device , a multiplexing mode of a first synchronization signal block, SSB, and a downlink signal according to whether the first SSB is from a serving cell or from a neighboring cell, wherein whether the first SSB is from a serving cell or from a neighboring cell is determined according to a physical cell identification, PCID, carried by the first SSB, the step of determining (S210) the multiplexing mode comprising: in the case that the first SSB is not from the serving cell, determining that the multiplexing mode is: the first SSB and the downlink signal support transmission on the same orthogonal frequency division multiplexing, OFDM, symbol; and in the case that the first SSB is from the serving cell, determining that the multiplexing mode is: the first SSB and the downlink signal are transmitted on different OFDM symbols; receiving (S220), by the terminal device , the downlink signal according to the multiplexing mode, comprising: in the case where the multiplexing mode is to support transmission on the same OFDM symbol. the terminal device receives the first SSB and the downlink signal on the same or different OFDM symbols, and the terminal device supports reception of the first SSB and the downlink signal on the same OFDM symbol, and also supports reception of the first SSB and the downlink signal on different OFDM symbols. determining (S210), by a terminal device , a multiplexing mode of a first synchronization signal block, SSB, and a downlink signal according to whether the first SSB is from a serving cell or from a neighboring cell, wherein whether the first SSB is from a serving cell or from a neighboring cell is determined according to a physical cell identification, PCID, carried by the first SSB, the step of determining (S210) the multiplexing mode comprising: in the case that the first SSB is not from the serving cell, determining that the multiplexing mode is: the first SSB and the downlink signal support transmission on the same orthogonal frequency division multiplexing, OFDM, symbol; and in the case that the first SSB is from the serving cell, determining that the multiplexing mode is: the first SSB and the downlink signal are transmitted on different OFDM symbols; in the case that the first SSB is not from the serving cell, determining that the multiplexing mode is: the first SSB and the downlink signal support transmission on the same orthogonal frequency division multiplexing, OFDM, symbol; and in the case that the first SSB is from the serving cell, determining that the multiplexing mode is: the first SSB and the downlink signal are transmitted on different OFDM symbols; receiving (S220), by the terminal device , the downlink signal according to the multiplexing mode, comprising: in the case where the multiplexing mode is to support transmission on the same OFDM symbol. the terminal device receives the first SSB and the downlink signal on the same or different OFDM symbols, and the terminal device supports reception of the first SSB and the downlink signal on the same OFDM symbol, and also supports reception of the first SSB and the downlink signal on different OFDM symbols. <EOS>