The present disclosure relates to a communication method and system for converging a 5th-Generation (5G) communication system for supporting higher data rates beyond a 4th-Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure provides a method for controlling services of a user equipment (UE) in a light connection, including: a first radio access network (RAN) node determines whether a predetermined condition is met, when determining that the predetermined condition is met, the first RAN node controls to transmit information about light connection state of the UE, and/or, indication information about light connection of the UE, based on the connection control. The present disclosure also provides a method for controlling data continuity of a UE, including: a core network (CN) node receives information about light connection state of the UE, and/or, indication information about light connection of the UE; the CN node control services of the UE, based on foregoing received information. The present disclosure also provides another method for controlling services of a UE in a light connection, and a corresponding device. By adopting the technical solution of the present disclosure, from one aspect, signaling overheads are saved by using the light connection, from another aspect, implementations of existing functions and services will not be affected by introducing the light connection. The present invention provides a data continuity controlling method for a UE, which recites: determining, by a first radio access network node, whether a preset condition is satisfied; and when determining that the preset condition is satisfied and the UE performs Cellular Internet of Things (CIOT) service, transmitting, by the first radio access network node, data transmission information associated with the UE and/or data forwarding requirement information associated with the UE. The present invention further provides another data continuity controlling method for a UE, which recites: obtaining, by a first core network node, data transmission information associated with the UE, and/or receiving a data packet of the UE; performing, by the first core network node, Cellular Internet of Things (CIOT) data transmission control according to the obtained data transmission information associated with the UE and/or the received data packet of the UE. The present invention further provides other data continuity controlling methods for a UE and corresponding devices. According to technical solutions disclosed by the present disclosure, data continuity can be implemented at the same time when saving UE energy.