The technology of this application relates to a data transmission method. The method includes an application server sending a subscription request to a core network element, to subscribe to a notification indicating whether transmitting data of a first service to first user equipment in a multicast mode is supported, so that a transmission mode of the data of the first service can be flexibly selected based on a subscription result.

Prompt and secure data communication paring concepts are described. In one example, a method for data communications includes a client device receiving an advertising packet from a peripheral device, comparing a signal strength indicator for the advertising packet to a threshold, generating a session key based on the comparing, and transmitting the session key to the peripheral device. The method also includes communicating and acknowledging one or more data chunks between the devices through a secure communications channel. The concepts are different that traditional pairing techniques for short-range, low-power wireless data communications in that secure communications channels can be achieved automatically, relatively more quickly, and repeatedly without the need for user intervention. The secure communications channels can be established and reestablished without the need for traditional pairing techniques.

Prompt and secure data communication paring concepts are described. In one example, a method for data communications includes a client device receiving an advertising packet from a peripheral device, comparing a signal strength indicator for the advertising packet to a threshold, generating a session key based on the comparing, and transmitting the session key to the peripheral device. The method also includes communicating and acknowledging one or more data chunks between the devices through a secure communications channel. The concepts are different that traditional pairing techniques for short-range, low-power wireless data communications in that secure communications channels can be achieved automatically, relatively more quickly, and repeatedly without the need for user intervention. The secure communications channels can be established and reestablished without the need for traditional pairing techniques.

Systems, apparatuses, and methods are described for wireless communications. A base station and wireless device may communicate capability information associated with a wireless device. The capability information may include information indicating support for an Ethernet type packet data unit session or header parameter compression. An Ethernet type packet data unit session may be instantiated based on the capability information.

A policy control method, an apparatus, and a system, where the method includes: receiving, by a session management network element, a first message from a terminal device, where the first message includes a quality of service (QoS) rule identifier and a first operation indication; sending, by the session management network element, a second message to a policy control network element, where the second message includes a policy and charging control (PCC) rule identifier corresponding to the QoS rule identifier and a second operation indication corresponding to the first operation indication; and receiving, by the policy control network element, the second message, and performing, by the policy control network element on a PCC rule corresponding to the PCC rule identifier, a second operation indicated by the second operation indication.

A policy control method, an apparatus, and a system, where the method includes: receiving, by a session management network element, a first message from a terminal device, where the first message includes a quality of service (QoS) rule identifier and a first operation indication; sending, by the session management network element, a second message to a policy control network element, where the second message includes a policy and charging control (PCC) rule identifier corresponding to the QoS rule identifier and a second operation indication corresponding to the first operation indication; and receiving, by the policy control network element, the second message, and performing, by the policy control network element on a PCC rule corresponding to the PCC rule identifier, a second operation indicated by the second operation indication.

Disclosed is a 5.sup.th generation (5G) or pre-5G communication system for supporting a data transmission rate higher than that of a 4.sup.th generation (4G) communication system such as long term evolution (LTE). According to various embodiments of the disclosure, provided is a method for operating an access and mobility management function (AMF) in a wireless communication system, comprising the steps of: receiving, from user equipment (UE), a service request including a list of protocol data unit (PDU) sessions to be activated, or a message about a mobility registration update; checking, on the basis of UE context information about the UE, whether identifiers (IDs) of all of always-on PDU sessions are included in the list of PDU sessions to be activated; and, when an omitted always-on PDU session is checked from the list of the PDU sessions to be activated, transmitting, to a session management function (SMF), a Nsmf_PDUSession_UpdateSMContext request message for requesting user plane activation of the omitted always-on PDU session.

The present disclosure relates to a method and apparatus for allowing a user equipment (UE) to manage a session in a wireless communication system. According to an embodiment of the present disclosure, the UE may transmit a first uplink (UL) non-access stratum (NAS) transport message including a packet data unit (PDU) session establishment request to an access and mobility management function (AMF), receive a downlink (DL) NAS transport message from the AMF, and transmit a second UL NAS transport message including the PDU session establishment request based on a timer.

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 support of a virtual network group according to an embodiment of the present disclosure enables efficient communication of a terminal by using an external network, configured via an existing short-range communication network, or a private network between terminals based on 5G. Accordingly, a network operator or an entity in charge thereof enables terminals to interwork with equipment through communication via a virtual private network without changes in an existing communication method or a network structure, or without adding additional equipment.

A method and a device for session setup and handover in a wireless communication system are provided. The method comprises receiving, from a second node, a message comprising a single network slice selection assistance information (S-NSSAI) of a protocol data unit (PDU) session; and allocating session resources for the PDU session based on the message received from the second node, wherein, in case that the S-NSSAI of the PDU session is supported by the first node, the session resources for the PDU session includes resources related to the S-NSSAI of the PDU session, and wherein, in case that the S-NSSAI of the PDU session is unsupported by the first node or the resources related to the S-NSSAI are unavailable or overloaded, the session resources for the PDU session includes other available resources for the PDU session.