A disclosure of the present specification provides a method for performing sidelink communication by a UE. The method may comprise the steps of: performing sidelink communication on the basis of a first RAT; switching an RAT for the sidelink communication from the first RAT to a second RAT; and performing the sidelink communication on the basis of the second RAT.

The present disclosure relates to a communication method and system for converging a 5.sup.th-Generation (5G) communication system for supporting higher data rates beyond a 4.sup.th-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 of a base station for supporting an inter-system handover from an evolved packet system (EPS) system to a 5th generation (5G) system. The method solves the data forwarding problem during the movement of a UE between an LTE system and a 5G system, so that the loss of data is avoided and the continuity of services is ensured.

A method and apparatus for a mobile communication device such as a mobile telephone includes a communication system that operates using narrow band-internet of things communication. The mobile communication device switches from communication using a mobile telephone communication system to communication using the narrow band-internet of things communication upon occurrence of a condition. The condition may include the mobile communication apparatus being out of range of a base station for the mobile telephone communication network or the battery level of the mobile communication device falling below a threshold. The mobile communication apparatus may switch from discontinuous reception to extended discontinuous reception If the battery power falls below a second threshold, or may switch to a power save mode if the battery power falls below a third threshold. Fewer services are available with the narrow band-internet of things communication, but the range is extended and power usage is less.

The present disclosure relates to a pre-5.sup.th-Generation (5G) or 5G communication system to be provided for supporting higher data rates beyond 4.sup.th-Generation (4G) communication system such as Long Term Evolution (LTE). A communication method by a cellular base station is provided. A method for performing communication by a cellular base station comprises transmitting information on a set of one or more non-cellular APs associated with the cellular base station to a UE and receiving information on an event triggered based on a measurement on at least one AP in the set from the UE.

Various example embodiments for supporting seamless converged broadband service are presented herein. Various example embodiments for supporting seamless converged broadband service may be configured to use a client device at a customer location to provide network connectivity for a customer premises gateway device at the customer location. Various example embodiments for supporting seamless converged broadband service may be configured to use a wireless hotspot of a client device at a customer location to provide network connectivity for a customer premises gateway device at the customer location.

A method, apparatus, and computer program product are provided. In the contexts of a method, the method detects a radio signal using a single antenna configured to detect a plurality of radio signal types. The method determines a frequency of the radio signal. The method determines a radio signal type of the radio signal based at least on the frequency. The method determines a strength of the radio signal. The method transforms the radio signal based at least on the radio signal type or the strength of the radio signal.

A communication method, a terminal, and a network device are provided. The communication method includes: performing, by a terminal, a first handover from a first cell to a second cell for enabling the terminal to perform a first service, where the first cell does not support the first service, and the second cell supports the first service; and in a case that the first handover fails, or radio link failure occurs after the first handover succeeds, transmitting, by the terminal, first information, where the first information is used for optimizing mobility network parameter setting and/or performing mobility robust optimization.

The communication apparatus includes a wireless communication unit and a determination unit. The wireless communication unit selectively connects to and communicates with a plurality of wireless communication networks in which at least one of a frequency band and a wireless communication method is different from each other. The determination unit determines whether to switch to another wireless communication network among the plurality of wireless communication networks on the basis of a communication status of at least any one of communication of layer 2, layer 3, layer 4, and layer 7 performed via any one of the plurality of wireless communication networks.

A communication device, method and computer program product reduce time to connect a communication session. The communication device registers for cellular communication service using a first radio access technology (RAT) or sub-RAT with a first node. The communication device determines whether a connection for a selected communication service is predicted to be available from the first node. The communication device determines whether a request for the selected communication service is predicted to occur. In response to determining that the connection for the selected communication service is unavailable from the first node and the request for the selected communication service is predicted to occur, the communication device identifies a second node that supports communication using a second RAT/sub-RAT. The communication devices triggers registration fallback from the first node to the second node. In response to receiving the request, the communication device connects to the second node for the selected communication service.

Systems and methods for ultra reliable reporting of secondary cell group (SCG) measurements to a secondary node (SN) used in multi-radio dual connectivity (MR-DC) operation that specifically account for the possibility of SCG special cell (SpCell) degradation are disclosed herein. A user equipment (UE) may establish a signaling radio bearer (SRB) 3 with the SN. The UE may then identify that a handover condition (which may be associated with SCG SpCell degradation) for the SCG SpCell is met, and accordingly send an SCG measurement report over each of the SRB3 and an SRB1 between the UE and a master node (MN) used in the MR-DC operation. Such information received at the MN is forwarded to the SN. Accordingly, the reception of SCG measurement reports (to enable handover to a new SpCell by the SN) is not solely dependent messages on the SpCell of the SCG alone (using SRB3), improving reliability.