A method for retransmission processing, comprising: transmitting, by a transmission side, a detection indication to a receiving side, the detection indication being used to indicate the receiving side to feed back a receiving state of a plurality of Acknowledged Mode Data, AMD, Protocol Data Units, PDU, sent by the transmission side; setting, by the transmission side, a first value to a value equal to a maximum SN in SNs of the plurality of AMD PDUs; receiving, by the transmission side, a state report sent by the receiving side, the state report being used to indicate a receiving state of at least one AMD PDU of the plurality of AMD PDUs; and responsive to that a Sequence Number, SN, of a first AMD PDU of the at least one AMD PDU is equal to the first value, stopping, by the transmission side, transmitting the detection indication for the plurality of AMD PDUs to the receiving side; wherein a packet header of a second AMD PDU of the plurality of AMD PDUs comprises the detection indication, and the method further comprises: after the transmission side delivers the second AMD PDU from a Radio Link Control, RLC, layer to a Media Access Control, MAC, layer, starting or restarting, by the transmission side, a detection retransmission timer; characterized in that the method further comprises: responsive to that the SN of none of the at least one AMD PDU is equal to the first value, continuing, by the transmission side, to transmit the detection indication for the plurality of AMD PDUs to the receiving side for a duration of the detection retransmission timer. transmitting, by a transmission side, a detection indication to a receiving side, the detection indication being used to indicate the receiving side to feed back a receiving state of a plurality of Acknowledged Mode Data, AMD, Protocol Data Units, PDU, sent by the transmission side; setting, by the transmission side, a first value to a value equal to a maximum SN in SNs of the plurality of AMD PDUs; receiving, by the transmission side, a state report sent by the receiving side, the state report being used to indicate a receiving state of at least one AMD PDU of the plurality of AMD PDUs; and responsive to that a Sequence Number, SN, of a first AMD PDU of the at least one AMD PDU is equal to the first value, stopping, by the transmission side, transmitting the detection indication for the plurality of AMD PDUs to the receiving side; wherein a packet header of a second AMD PDU of the plurality of AMD PDUs comprises the detection indication, and the method further comprises: after the transmission side delivers the second AMD PDU from a Radio Link Control, RLC, layer to a Media Access Control, MAC, layer, starting or restarting, by the transmission side, a detection retransmission timer; characterized in that the method further comprises: responsive to that the SN of none of the at least one AMD PDU is equal to the first value, continuing, by the transmission side, to transmit the detection indication for the plurality of AMD PDUs to the receiving side for a duration of the detection retransmission timer. after the transmission side delivers the second AMD PDU from a Radio Link Control, RLC, layer to a Media Access Control, MAC, layer, starting or restarting, by the transmission side, a detection retransmission timer; characterized in that the method further comprises: responsive to that the SN of none of the at least one AMD PDU is equal to the first value, continuing, by the transmission side, to transmit the detection indication for the plurality of AMD PDUs to the receiving side for a duration of the detection retransmission timer.