The present disclosure relates to a communication technique of fusing a 5G communication system for supporting higher data transmission rate beyond a 4G system with an IoT technology and a system thereof. The present disclosure may be applied to intelligent services (e.g., smart home, smart building, smart city, smart car or connected car, health care, digital education, retail business, security and safety related service, or the like) based on the 5G communication technology and the IoT related technology. A communication method of a CCNF comprises detecting a CCNF relocation necessity situation, determining a new CCNF, and transmitting a CCNF relocation request message including information on a terminal being served by the CCNF to the new CCNF The method further comprises receiving a CCNF relocation response message from the new CCNF, and performing a location update procedure with the terminal according to a predetermined condition.

In response to receiving from a source RAN node (2), on a direct interface (101), a message requesting a handover of a radio terminal (1) from a first network to a second network, a target RAN node (3) receives at least one of slice information and flow information from a core network (5), and controls communication of the radio terminal (1) based on at least one of the slice information and the flow information. The slice information relates to a network slice in the second network. The flow information relates to at least one session to be established in the second network, serving as a bearer-less network, in order to transfer at least one packet flow of the radio terminal (1). It is thus possible, for example, to provide an Inter-RAT handover procedure involving transfer of handover signaling messages on a direct inter-base-station interface.

A wireless network for mobile communications has a connectionless framework using native internet protocol (IP). In this connectionless framework, packet routing may be based on user endpoint (UE) physical IP address, which is associated with the prefix of an associated access node (e.g. eNB). In addition to using the connectionless-IP framework for the traffic flow carried by one access point (e.g. eNB) at a time, advanced mobile call processing features, such as carrier aggregation and dual connectivity, are enhanced to leverage the packet-oriented connectionless radio access network and wireless core network architecture by using the SDN architecture and a wireless network specific software-defined network controller.

A target RAN node (3) is configured to: receive, directly from a core network (5), core network context information about a handover of a radio terminal (1) from a first network to the second network; and control communication of the radio terminal (1) based on the core network context information. The target RAN node (3) is further configured to transfer a handover signaling message to a source RAN node on a direct interface (101) in response to receiving the core network context information. The core network context information includes at least one of flow information, slice information, and security-related information. It is thus possible, for example, to provide an inter-RAT handover procedure involving transfer of handover signaling messages on a direct inter-base-station interface.

Embodiments of the present disclosure relates to communication over a network comprising network slices. According to one embodiment of the present disclosure, there provide a method performed by a network node. The method comprises: informing, in response to determination that user traffic of at least one user equipment needs to be redirected from a first network slice to a second network slice, a control plane function node supporting the first network slice of a redirecting user traffic request. Compared with the second network slice, a way of handling a control plane and/or user plane for communication services in the second network slice is different from that in the first network slice. In the other aspects of the present disclosure, there also provides methods for communication by a control plane function node and by a user equipment and corresponding apparatuses.

Configurations are described for maintaining a continuity and quality of wireless signal connection between a mobile device and systems accessible through the internet. In particular, configurations are disclosed to address the challenge of a mobile device that moves through a physical environment wherein the best wireless connectivity performance is achieved by switching between available connection sources and constantly evaluating a primary connection with other available connections that may be switched in to become a new primary connection. The mobile device may be self-propelled or carried by some other mobilizing means.

A channel automatic selection and switching method and system, where after an access point (AP) and a station (STA) are successfully coupled, the AP performs quality detection on a first channel, determines, based on a quality detection result, whether the first channel needs to be switched, performs quality detection on backup channels when the first channel needs to be switched, and starts channel switching for the AP and the STA when there is a backup channel of higher quality. Because the backup channel and the first channel use same network coupling information, for the STA, a data link layer coupling is the same. Therefore, during first channel switching, a coupling interruption phenomenon does not occur, and thereby completing first channel switching without interrupting the data link layer coupling between the AP and the STA.

Example devices, computer-readable media, and methods for transferring a connection to a packet data network from a first session via a first radio access infrastructure to a second session via a second radio access infrastructure are disclosed. A processing system of a cellular network may receive, via a first radio access infrastructure from an endpoint device, a request to establish a connection to a packet data network via the cellular network and establish a first session for the connection to the packet data network for the endpoint device via the first radio access infrastructure. The processing system may detect at least one condition for transferring the connection to the packet data network to a second session via a second radio access infrastructure that is different from the first radio access infrastructure, establish the second session, and transfer the connection to the packet data network to the second session.

There is provided a method, comprising: communicating a first data session on a first network slice with a source network node; receiving an indication indicating whether or not mapping the first data session to a second data session at a target network node requires switching to a second network slice, wherein the user equipment is equipped with a dual active protocol stack enabling the user equipment to communicate with the source network node and with the target network node during the handover process of the apparatus from a source cell provided by the source network node to a target cell provided by the target network node; deciding to continue the first data session on the first network slice with the source network node during the handover process; and deciding, based on the indication, when to start user plane data communication on the second data session with the target network node.

Methods, apparatus, and systems are disclosed. A method, implemented by a Wireless Transmit/Receive Unit (WTRU) may use a first Public Land Mobile Network (PLMN) not affected by a disaster condition and a second PLMN affected by a disaster condition. The method may include: receiving from a CAG cell of the first PLMN, broadcast information indicating: (1) that the CAG cell supports disaster inbound roaming (DIR) of WTRUs associated with the second PLMN and (2) that the CAG Cell accepts CAG-supporting disaster inbound roamers; selecting the CAG cell of the first PLMN based on the broadcasted information; and sending a Registration Request message including information indicating a DIR indication and an identifier of the second PLMN. The method may further include receiving new CAG information associated with the first PLMN; and initiating a cell (re)selection procedure using the new CAG information associated with the first PLMN.