A method of transmission configuration, performed by a terminal, wherein the method comprises: determining a designated message, the designated message being configured to trigger a base station to configure a Transmission Configuration Indication, TCI, state set for the terminal; and transmitting the designated message to the base station in a random access process, such that the base station configures the TCI state set according to the designated message; characterized in that the method further comprises: receiving a fourth message transmitted by the base station and configured to represent that contention resolution is successful; and receiving Radio Resource Control, RRC, signaling transmitted by the base station, the RRC signaling comprising a first TCI state set for Physical Downlink Control Channel, PDCCH, reception and/or a second TCI state set for Physical Downlink Shared Channel, PDSCH, reception, which are/is configured for the terminal by the base station, wherein the first TCI state set is used to determine a TCI state identifier for PDCCH reception and a first corresponding relationship between the TCI state identifier for PDCCH reception and at least one of an SSB identifier or a CSI-RS identifier, and the second TCI state set is used to determine a TCI state identifier for PDCCH reception and a second corresponding relationship between the TCI state identifier for PDSCH reception and at least one of an SSB identifier or a CSI-RS identifier. determining a designated message, the designated message being configured to trigger a base station to configure a Transmission Configuration Indication, TCI, state set for the terminal; and transmitting the designated message to the base station in a random access process, such that the base station configures the TCI state set according to the designated message; characterized in that the method further comprises: receiving a fourth message transmitted by the base station and configured to represent that contention resolution is successful; and receiving Radio Resource Control, RRC, signaling transmitted by the base station, the RRC signaling comprising a first TCI state set for Physical Downlink Control Channel, PDCCH, reception and/or a second TCI state set for Physical Downlink Shared Channel, PDSCH, reception, which are/is configured for the terminal by the base station, wherein the first TCI state set is used to determine a TCI state identifier for PDCCH reception and a first corresponding relationship between the TCI state identifier for PDCCH reception and at least one of an SSB identifier or a CSI-RS identifier, and the second TCI state set is used to determine a TCI state identifier for PDCCH reception and a second corresponding relationship between the TCI state identifier for PDSCH reception and at least one of an SSB identifier or a CSI-RS identifier. receiving a fourth message transmitted by the base station and configured to represent that contention resolution is successful; and receiving Radio Resource Control, RRC, signaling transmitted by the base station, the RRC signaling comprising a first TCI state set for Physical Downlink Control Channel, PDCCH, reception and/or a second TCI state set for Physical Downlink Shared Channel, PDSCH, reception, which are/is configured for the terminal by the base station, wherein the first TCI state set is used to determine a TCI state identifier for PDCCH reception and a first corresponding relationship between the TCI state identifier for PDCCH reception and at least one of an SSB identifier or a CSI-RS identifier, and the second TCI state set is used to determine a TCI state identifier for PDCCH reception and a second corresponding relationship between the TCI state identifier for PDSCH reception and at least one of an SSB identifier or a CSI-RS identifier. <EOS>