A scheduling information sending method, wherein the method comprises: attempting (S301), by a network device, to receive data repeatedly transmitted on grant-free resource by user equipment UE in N consecutive transmission time units starting from a transmission time unit in which the network device detects for a first time the data transmitted by the UE, wherein N is an integer greater than or equal to 1 and less than or equal to K, and K is a maximum quantity of times that the UE repeatedly transmits the data, and wherein if the network device detects a first DMRS associated with the data detected on the grant-free resource, the data detected for the first time is considered as data of the first-time transmission in the repeated transmission of the UE; and if the network device detects a second DMRS associated with the data detected on the grant-free resource, the data detected for the first time is considered as data of the non-first-time transmission in the repeated transmission of the UE, wherein the first DMRS is used for the first-time transmission in the K-time repeated transmission of the UE, and the second DMRS is used for non-first-time transmission in the K-time repeated transmission of the UE; and sending (S302), by the network device, scheduling information to the UE when the network device does not obtain correctly decoded data of the data in the N transmission time units, wherein the scheduling information comprises information about a transmission resource used by the user equipment to retransmit the data, and the transmission resource comprises at least one of a time resource and a frequency resource. attempting (S301), by a network device, to receive data repeatedly transmitted on grant-free resource by user equipment UE in N consecutive transmission time units starting from a transmission time unit in which the network device detects for a first time the data transmitted by the UE, wherein N is an integer greater than or equal to 1 and less than or equal to K, and K is a maximum quantity of times that the UE repeatedly transmits the data, and wherein if the network device detects a first DMRS associated with the data detected on the grant-free resource, the data detected for the first time is considered as data of the first-time transmission in the repeated transmission of the UE; and if the network device detects a second DMRS associated with the data detected on the grant-free resource, the data detected for the first time is considered as data of the non-first-time transmission in the repeated transmission of the UE, wherein the first DMRS is used for the first-time transmission in the K-time repeated transmission of the UE, and the second DMRS is used for non-first-time transmission in the K-time repeated transmission of the UE; and sending (S302), by the network device, scheduling information to the UE when the network device does not obtain correctly decoded data of the data in the N transmission time units, wherein the scheduling information comprises information about a transmission resource used by the user equipment to retransmit the data, and the transmission resource comprises at least one of a time resource and a frequency resource. <EOS>