A communication method, comprising: transmitting, by a first network element to a second network element, a first message (100, 300, 500, 700) comprising first information of a protocol data unit, PDU, session to be split; receiving, by the first network element from the second network element, in response to the second network element receiving the first message (100, 300, 500, 700), a second message (102, 302, 502,702) comprising second information of the PDU session indicating acceptance of a splitting of the PDU session by the second network element; and transmitting, by the first network element to a core network, in response to the second message, a third message (103, 303, 503, or 703) comprising third information of the PDU session, the third information indicating the splitting of the PDU session, wherein the first information of the PDU session comprises a PDU session identifier of the PDU session, next generation, NG, interface uplink tunnel endpoint information associated with the PDU session, and Quality of Service, QoS, flow information associated with the PDU session, wherein the first information of the PDU session further comprises data radio bearer, DRB, information of a DRB associated with the PDU session, the DRB information comprising a DRB identifier, ID, of the DRB, and at least one QoS flow identifier mapped to the DRB, wherein the second information of the PDU session comprises an Xn interface data forwarding tunnel endpoint information of the PDU session and the Xn interface data forwarding tunnel endpoint information corresponding to the DRB established for the split PDU session, and wherein the third information of the PDU session comprises the PDU session identifier of the PDU session and NG interface downlink tunnel endpoint information, and wherein the third message further comprises one or more QoS flow identifiers corresponding to NG interface downlink tunnel endpoint information. transmitting, by a first network element to a second network element, a first message (100, 300, 500, 700) comprising first information of a protocol data unit, PDU, session to be split; receiving, by the first network element from the second network element, in response to the second network element receiving the first message (100, 300, 500, 700), a second message (102, 302, 502,702) comprising second information of the PDU session indicating acceptance of a splitting of the PDU session by the second network element; and transmitting, by the first network element to a core network, in response to the second message, a third message (103, 303, 503, or 703) comprising third information of the PDU session, the third information indicating the splitting of the PDU session, wherein the first information of the PDU session comprises a PDU session identifier of the PDU session, next generation, NG, interface uplink tunnel endpoint information associated with the PDU session, and Quality of Service, QoS, flow information associated with the PDU session, wherein the first information of the PDU session further comprises data radio bearer, DRB, information of a DRB associated with the PDU session, the DRB information comprising a DRB identifier, ID, of the DRB, and at least one QoS flow identifier mapped to the DRB, wherein the second information of the PDU session comprises an Xn interface data forwarding tunnel endpoint information of the PDU session and the Xn interface data forwarding tunnel endpoint information corresponding to the DRB established for the split PDU session, and wherein the third information of the PDU session comprises the PDU session identifier of the PDU session and NG interface downlink tunnel endpoint information, and wherein the third message further comprises one or more QoS flow identifiers corresponding to NG interface downlink tunnel endpoint information.