A relay transmission method, comprising: receiving, by a relay terminal equipment, a first Layer 1, L1, data frame which is intended to be sent to a receiver equipment by a sender equipment, wherein the first L1 data frame is obtained by the sender equipment by processing through L1, a Media Access Control, MAC, Protocol Data Unit, PDU, containing identification information of a remote terminal equipment, the identification information of the remote terminal equipment comprising a Layer-2, L2, identifier of the remote terminal equipment or a terminal equipment identifier of the remote terminal equipment; determining in the L1, by the relay terminal equipment, that the first L1 data frame is required to be forwarded, wherein a user-plane protocol stack, configured for relay transmission, of the relay terminal equipment comprises only the L1; and performing, by the relay terminal equipment, forwarding processing on the first L1 data frame in the L1, wherein the first L1 data frame is forwarded to the receiver equipment, wherein the sender equipment is the remote terminal equipment and the receiver equipment is a network equipment, or the sender equipment is the network equipment and the receiver equipment is the remote terminal equipment; wherein when the sender equipment is the network equipment, before receiving, by the relay terminal equipment, the first L1 data frame which is intended to be sent to the receiver equipment by the sender equipment, further comprising: performing, by the relay terminal equipment, addressing through a relay-specific Radio Network Temporary Identity, RNTI, the relay-specific RNTI corresponding to relay transmission, wherein determining, by the relay terminal equipment, that the first L1 data frame is required to be forwarded comprises: if the first L1 data frame is received by the relay terminal equipment by addressing through the relay-specific RNTI, determining, by the relay terminal equipment, that the first L1 data frame contains the relay data, thereby determining that the first L1 data frame is required to be forwarded. receiving, by a relay terminal equipment, a first Layer 1, L1, data frame which is intended to be sent to a receiver equipment by a sender equipment, wherein the first L1 data frame is obtained by the sender equipment by processing through L1, a Media Access Control, MAC, Protocol Data Unit, PDU, containing identification information of a remote terminal equipment, the identification information of the remote terminal equipment comprising a Layer-2, L2, identifier of the remote terminal equipment or a terminal equipment identifier of the remote terminal equipment; determining in the L1, by the relay terminal equipment, that the first L1 data frame is required to be forwarded, wherein a user-plane protocol stack, configured for relay transmission, of the relay terminal equipment comprises only the L1; and performing, by the relay terminal equipment, forwarding processing on the first L1 data frame in the L1, wherein the first L1 data frame is forwarded to the receiver equipment, wherein the sender equipment is the remote terminal equipment and the receiver equipment is a network equipment, or the sender equipment is the network equipment and the receiver equipment is the remote terminal equipment; wherein when the sender equipment is the network equipment, before receiving, by the relay terminal equipment, the first L1 data frame which is intended to be sent to the receiver equipment by the sender equipment, further comprising: performing, by the relay terminal equipment, addressing through a relay-specific Radio Network Temporary Identity, RNTI, the relay-specific RNTI corresponding to relay transmission, wherein determining, by the relay terminal equipment, that the first L1 data frame is required to be forwarded comprises: if the first L1 data frame is received by the relay terminal equipment by addressing through the relay-specific RNTI, determining, by the relay terminal equipment, that the first L1 data frame contains the relay data, thereby determining that the first L1 data frame is required to be forwarded.