| CPC H04W 40/246 (2013.01) [H04B 7/15 (2013.01)] | 20 Claims |

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1. A relay method, applied to a relay terminal, wherein the relay terminal comprises a relay protocol stack, the relay protocol stack is configured to be between a packet data convergence protocol (PDCP) layer and a layer 2 protocol stack, and the relay protocol stack comprises a relay receiver entity and a relay sender entity, comprising:
receiving, by the relay receiver entity, a relay protocol data unit (PDU) sent by a prior node, and transmitting, by the relay receiver entity, the relay PDU to the relay sender entity; and
sending, by the relay sender entity, the relay PDU to a next node,
wherein the relay PDU comprises a second relay PDU, and a protocol header of the second relay PDU comprises:
a terminal identifier of a remote terminal, wherein the terminal identifier is a destination identifier of the second relay PDU; and
a radio bearer identifier, wherein the radio bearer identifier is an identifier of a radio bearer between the remote terminal and a network device.
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