A method includes: receiving an uplink data stream packet; determining a resource module used to process the uplink data stream packet and an identifier of the resource module; modifying the uplink data stream packet based on the identifier of the resource module; and forwarding a modified uplink data stream packet. After a downlink data stream packet is received, a resource module used to process the downlink data stream packet is determined based on an identifier of a resource module in the downlink data stream packet, where the identifier of the resource module in the downlink data stream packet is added after learning the identifier of the resource module in the uplink data stream packet. In this method, the uplink and downlink data stream packets are transmitted by using a same resource module, so that a success rate of communication transmission is effectively improved.