A wireless communications apparatus, comprising: a receiving unit, configured to receive higher layer signaling from a base station, wherein the higher layer signaling is used to indicate a downlink aggregation coefficient S, S is an integer greater than 1, the downlink aggregation coefficient S corresponds to S consecutive transmission time units, and each transmission time unit is used to repeatedly transmit a transport block of a terminal, wherein the receiving unit is further configured to receive physical layer signaling from the base station, wherein the physical layer signaling is used to schedule the transport block of the terminal and comprises first indication information, and the first indication information is used to indicate that a part of resource of a downlink control region is used to transmit the transport block of the terminal; and a processing unit, configured to determine a valid time of the first indication information, wherein the valid time is one or more transmission time units in the S consecutive transmission time units, characterised in that a size of the transmission time unit is M symbols, and M is an integer greater than 1 and less than or equal to 14, and for determining the valid time of the first indication information, the apparatus is configured to: determine a maximum valid time K according to a correspondence between M and the maximum valid time K, wherein the correspondence between M and K is predefined in a protocol; and the valid time of the first indication information is first min(K, S) transmission time units in the S transmission time units, and min(K, S) represents a smaller value in K and S. a receiving unit, configured to receive higher layer signaling from a base station, wherein the higher layer signaling is used to indicate a downlink aggregation coefficient S, S is an integer greater than 1, the downlink aggregation coefficient S corresponds to S consecutive transmission time units, and each transmission time unit is used to repeatedly transmit a transport block of a terminal, wherein the receiving unit is further configured to receive physical layer signaling from the base station, wherein the physical layer signaling is used to schedule the transport block of the terminal and comprises first indication information, and the first indication information is used to indicate that a part of resource of a downlink control region is used to transmit the transport block of the terminal; and a processing unit, configured to determine a valid time of the first indication information, wherein the valid time is one or more transmission time units in the S consecutive transmission time units, characterised in that a size of the transmission time unit is M symbols, and M is an integer greater than 1 and less than or equal to 14, and for determining the valid time of the first indication information, the apparatus is configured to: determine a maximum valid time K according to a correspondence between M and the maximum valid time K, wherein the correspondence between M and K is predefined in a protocol; and the valid time of the first indication information is first min(K, S) transmission time units in the S transmission time units, and min(K, S) represents a smaller value in K and S. determine a maximum valid time K according to a correspondence between M and the maximum valid time K, wherein the correspondence between M and K is predefined in a protocol; and the valid time of the first indication information is first min(K, S) transmission time units in the S transmission time units, and min(K, S) represents a smaller value in K and S.