A base station, comprising: a processing module, configured to: after a wireless terminal device establishes a radio resource control, RRC, connection to the base station, a control plane connection to a mobility management entity, MME, and a user plane bearer with a packet data network gateway, P-GW, determine that a network terminal device uses a user plane bearer that is between the base station and the P-GW and that is established by the wireless terminal device to transmit user plane data of the network terminal device, wherein the wireless terminal device and the network terminal device have a same terminal device identifier; wherein the processing module is further configured to: release an air interface connection between the wireless terminal device and the base station, or instruct the wireless terminal device to enter a power saving state; wherein the base station further comprises: a sending module, configured to send a context setup message to the network terminal device, wherein the context setup message carries at least a base station IP address and a context of the wireless terminal device, and the context setup message is used to establish a user plane bearer between the network terminal device and the base station; wherein the context of the wireless terminal device comprises at least a wireless terminal device identifier and information about a service QoS; wherein the information about the service QoS comprises a bearer-related communication context; and wherein the bearer-related communication context comprises an evolved packet system, EPS, bearer ID; or a dedicated radio bearer, DRB, ID. a processing module, configured to: after a wireless terminal device establishes a radio resource control, RRC, connection to the base station, a control plane connection to a mobility management entity, MME, and a user plane bearer with a packet data network gateway, P-GW, determine that a network terminal device uses a user plane bearer that is between the base station and the P-GW and that is established by the wireless terminal device to transmit user plane data of the network terminal device, wherein the wireless terminal device and the network terminal device have a same terminal device identifier; wherein the processing module is further configured to: release an air interface connection between the wireless terminal device and the base station, or instruct the wireless terminal device to enter a power saving state; wherein the base station further comprises: a sending module, configured to send a context setup message to the network terminal device, wherein the context setup message carries at least a base station IP address and a context of the wireless terminal device, and the context setup message is used to establish a user plane bearer between the network terminal device and the base station; wherein the context of the wireless terminal device comprises at least a wireless terminal device identifier and information about a service QoS; wherein the information about the service QoS comprises a bearer-related communication context; and wherein the bearer-related communication context comprises an evolved packet system, EPS, bearer ID; or a dedicated radio bearer, DRB, ID. a sending module, configured to send a context setup message to the network terminal device, wherein the context setup message carries at least a base station IP address and a context of the wireless terminal device, and the context setup message is used to establish a user plane bearer between the network terminal device and the base station; wherein the context of the wireless terminal device comprises at least a wireless terminal device identifier and information about a service QoS; wherein the information about the service QoS comprises a bearer-related communication context; and wherein the bearer-related communication context comprises an evolved packet system, EPS, bearer ID; or a dedicated radio bearer, DRB, ID.