A timer control method, performed by a terminal device, or a structure or an apparatus in the terminal device, comprising: monitoring a physical downlink control channel; obtaining downlink control information on the physical downlink control channel; and if the downlink control information indicates data transmission of N hybrid automatic repeat request, HARQ processes, and the terminal device is configured with the N HARQ processes, stopping a discontinuous reception inactivity timer; wherein N is equal to 2, the two HARQ processes correspond to two transport blocks, TBs, characterized in that the method further comprises: setting a length of a HARQ round trip time timer of the terminal device to duration of k+2Q+1+deltaPDCCH subframes, wherein k is an interval between a subframe n and a 1 st subframe used to transmit an ACK or NACK feedback of a 1st TB in the two TBs, wherein the subframe n is a last subframe used to transmit a 2 nd TB in the two TBs, transmission feedback duration of the 1 st TB is the same as that of the 2 nd TB, Q is a transmission feedback duration, and deltaPDCCH is an interval between a 1 st subframe after a subframe p and a 1 st subframe of a next physical downlink control channel occasion, wherein the subframe p is a last subframe used to transmit an ACK or NACK feedback of the 2 nd TB, wherein the 1 st TB is transmitted before the 2 nd TB; or setting a length of an uplink HARQ round trip time timer of the terminal device to duration of 1+deltaPDCCH subframes, wherein deltaPDCCH is an interval between a 1 st subframe after a subframe p and a 1 st subframe of a next physical downlink control channel occasion, and the subframe p is a last subframe of a 2 nd TB in the two TBs, wherein the 2 nd TB is a last transmitted TB in the two TBs. monitoring a physical downlink control channel; obtaining downlink control information on the physical downlink control channel; and if the downlink control information indicates data transmission of N hybrid automatic repeat request, HARQ processes, and the terminal device is configured with the N HARQ processes, stopping a discontinuous reception inactivity timer; wherein N is equal to 2, the two HARQ processes correspond to two transport blocks, TBs, characterized in that the method further comprises: setting a length of a HARQ round trip time timer of the terminal device to duration of k+2Q+1+deltaPDCCH subframes, wherein k is an interval between a subframe n and a 1 st subframe used to transmit an ACK or NACK feedback of a 1st TB in the two TBs, wherein the subframe n is a last subframe used to transmit a 2 nd TB in the two TBs, transmission feedback duration of the 1 st TB is the same as that of the 2 nd TB, Q is a transmission feedback duration, and deltaPDCCH is an interval between a 1 st subframe after a subframe p and a 1 st subframe of a next physical downlink control channel occasion, wherein the subframe p is a last subframe used to transmit an ACK or NACK feedback of the 2 nd TB, wherein the 1 st TB is transmitted before the 2 nd TB; or setting a length of an uplink HARQ round trip time timer of the terminal device to duration of 1+deltaPDCCH subframes, wherein deltaPDCCH is an interval between a 1 st subframe after a subframe p and a 1 st subframe of a next physical downlink control channel occasion, and the subframe p is a last subframe of a 2 nd TB in the two TBs, wherein the 2 nd TB is a last transmitted TB in the two TBs. setting a length of a HARQ round trip time timer of the terminal device to duration of k+2Q+1+deltaPDCCH subframes, wherein k is an interval between a subframe n and a 1 st subframe used to transmit an ACK or NACK feedback of a 1st TB in the two TBs, wherein the subframe n is a last subframe used to transmit a 2 nd TB in the two TBs, transmission feedback duration of the 1 st TB is the same as that of the 2 nd TB, Q is a transmission feedback duration, and deltaPDCCH is an interval between a 1 st subframe after a subframe p and a 1 st subframe of a next physical downlink control channel occasion, wherein the subframe p is a last subframe used to transmit an ACK or NACK feedback of the 2 nd TB, wherein the 1 st TB is transmitted before the 2 nd TB; or setting a length of an uplink HARQ round trip time timer of the terminal device to duration of 1+deltaPDCCH subframes, wherein deltaPDCCH is an interval between a 1 st subframe after a subframe p and a 1 st subframe of a next physical downlink control channel occasion, and the subframe p is a last subframe of a 2 nd TB in the two TBs, wherein the 2 nd TB is a last transmitted TB in the two TBs.