Abstract: A method in which a terminal device moves from a first AN node to a second AN node, where the method includes: receiving identification information of a to-be-activated session from the terminal device via the second AN node; sending a context release command to the first AN node when a signaling connection of the terminal device exits between an AMF node and the first AN node; receiving a context release complete message carrying identification information of an active session of the terminal device from the first AN node; when the to-be-activated session and the active session have a same session, sending a first request message to request to deactivate the same session to an SMF node corresponding to the same session; and after the same session is deactivated, sending, to the SMF node, a second request message to request to activate the same session.

Abstract: The present disclosure relates to user plane bearer setup methods and devices to switch data from a control plane solution to a user plane solution. In one example method, a serving gateway receives indication information sent by a mobility management entity, and allocates an identifier to a bearer according to the indication information to set up an S1 interface user plane bearer.

Abstract: A terminal includes a first universal subscriber identity module (USIM) and a second USIM. A method for determining a paging occasion (PO) of the terminal includes, in response to a first PO of the first USIM being the same as a PO of the second USIM, sending, by the terminal, indication information to a mobility management network element communicating with the first USIM. The indication information is used to indicate that POs of at least two USIMs in the terminal are the same. The method also includes receiving, by the terminal, a first parameter from the mobility management network element. The method further includes determining, by the terminal, a second PO of the first USIM based on the first parameter. The second PO of the first USIM is different from the PO of the second USIM.

Abstract: A communication method and device are provided. A terminal device receives a paging message carrying first service information of a first service from an AMF network element, where the paging message corresponds to a first USIM in at least two USIMs of the terminal device; and sends a response message of the paging message to the AMF network element based on the first service information and service information of a second service, where the second service is a current service of a second USIM of the terminal device, and the second USIM is in connected state. In embodiments of the present invention, responding to the paging message is determined based on service information of a service instead of blindly responding to the paging message, to avoid suspending the service of the USIM currently in the connected state on the terminal device once the paging message is received.

Abstract: This application provides a method, an apparatus, and a system for implementing service continuity in a data flow switch procedure. In the method, indication information is used to indicate a data flow for which an end marker message is used. In the data flow switch procedure, after receiving the end marker message, a source access network device can correctly identify, based on the indication information, the data flow on which the end marker message works, and can perform different processing on a data flow switched to a target access network device and a data flow kept on the source access network device.

Abstract: A communication method and an apparatus are provided, to effectively process a session of a terminal in a terminal handover scenario. The method may be applied to a scenario in which a terminal is handed over from a source access network element to a target access network element, and the method includes: obtaining session information of a first session of the terminal, where the session information includes first service type information; obtaining first information, where the first information is used to indicate service type information of local offloading supported by the target access network element; and if the target access network element supports local offloading of a service corresponding to the first service type information, determining that the target access network element processes the first session.

Abstract: This application relates to the field of wireless communication technologies, and provides a handover method. The method includes: A communication device obtains first information, where the first information is used to indicate one or more first PLMNs that support PC5 reference interface communication. The communication device determines a target PLMN, where the target PLMN is a PLMN in the one or more first PLMNs. The communication device requests handover from a source PLMN to the target PLMN, where the source PLMN does not support the PC5 reference interface communication. According to solutions provided in embodiments, the communication device performs the handover to the target PLMN that supports the PC5 reference interface communication. In this way, the PC5 reference interface communication can be performed without interrupting a current service, so that user experience is improved.

Abstract: This application discloses a method applied to a scenario in which a terminal device moves from a first AN node to a second AN node. The method includes: receiving identification information of a to-be-activated session from the terminal device via the second AN node; sending a context release command to the first AN node when a signaling connection of the terminal device exits between an AMF node and the first AN node; receiving a context release complete message carrying identification information of an active session of the terminal device from the first AN node; when the to-be-activated session and the active session have a same session, sending a first request message to request to deactivate the same session to an SMF node corresponding to the same session; and after the same session is deactivated, sending, to the SMF node, a second request message to request to activate the same session.

Abstract: A session activation method, device, and system, and relate to the field of the communications technologies, to resolve an existing problem of relatively high signaling overheads during PDU session activation. The method includes: receiving, by a control plane node, indication information from an AMF node, where the indication information is used to indicate that the AMF node receives a service request message sent by a terminal device; and sending, by the control plane node, an identifier of a to-be-activated PDU session of the terminal device to an SMF node or the AMF node based on the indication information.

Abstract: A communication apparatus and method the method including receiving, by an access stratum (AS) of a terminal, a groupcast message, where the terminal corresponds to a member in a group, determining, by the AS of the terminal, a feedback resource based on a sequence number of the member, and sending, by the AS of the terminal, an acknowledgement (ACK)/negative acknowledgement (NACK) message of the groupcast message based on the feedback resource.

Abstract: Embodiments of this application disclose a communication method and a communications apparatus, and are used in the field of communications technologies, to resolve a problem of how to notify an access network device of an NR PC5 QoS parameter of a terminal. The method in one embodiment includes a home V2XCF that obtains an NR PC5 QoS parameter of a terminal, and the home V2XCF sends the NR PC5 QoS parameter to an access network device, such as a first network element that is in an EPS. The first network element receives the NR PC5 QoS parameter and sends the NR PC5 QoS parameter to an MME. After receiving the NR PC5 QoS parameter, the MME sends the NR PC5 QoS parameter to an access network device. The first network element may be an HSS or a PCRF.

Abstract: A data processing method includes receiving by an access network device a vehicle-to-everything (V2X) communication parameter of a group member device. The method also includes storing, by the access network device, the V2X communication parameter with context about a group to which the group member device belongs. The V2X communication parameter is used for allocation of a ProSe communication 5 (PC5) resource to the group member device.

Abstract: Embodiments of this application disclose a communications method, apparatus, and system, and relate to the communications field, so that an access network device reserves a context of a V2X terminal, thereby ensuring that the V2X terminal implements PC5 interface communication. The method includes: A core network device obtains capability information indicating that the V2X terminal supports PC5 interface communication. The core network device maintains or skips releasing a signaling connection between the V2X terminal and the core network device based on the obtained capability information after completion of V2X terminal registration.

Abstract: Embodiments of the present disclosure disclose a method, an apparatus, and a system for data transmission. The method includes: broadcasting, by a relay device, a first message, where the first message is used to indicate that the relay device supports data forwarding; receiving, by the relay device, a second message from a remote device, where the second message includes data of the remote device; and sending, by the relay device, the data to a core network device based on the second message. In the present method, after receiving the first message broadcast by the relay device, the remote device directly sends the data of the remote device to the relay device without establishing a connection dedicated for transmitting the data of the remote device between the remote device and the relay device, thereby reducing signaling and reducing power consumption of the remote device.

Abstract: Example communication methods apparatus are described. One example method includes receiving air interface link signal information of neighboring network devices by a source network device from a terminal device. The source network device determines a target network device based on sidelink information of the terminal device and the air interface link signal information of the neighboring network devices. Then, the source network device may send a handover request to the target network device, so that the terminal device can be handed over from the source network device to the target network device. Therefore, the target network device determined by the source network device can better meet an air interface link communication requirement and a sidelink communication requirement of the terminal device.

Abstract: This application discloses a communication method, and a communications apparatus and system, and is applied to the vehicle-to-everything V2X field, so that a terminal device can obtain an updated V2X parameter, to resolve a problem that communication fails because the terminal device uses an expired V2X parameter. The communication method includes: receiving, by a V2X control network element, parameter update indication information sent by a user data management network element, where the parameter update indication information is used to indicate that a V2X parameter of a terminal device is updated; and sending, by the V2X control network element, an updated V2X parameter to the terminal device based on the parameter update indication information.

Abstract: Embodiments of this application relate to the field of communications technologies, and disclose a communication method and a communications apparatus, to resolve a problem caused when V2X services on different frequency bands are transmitted by using a same QoS flow. The method includes: A transmit end determines a layer-2 address pair of a first V2X service based on a frequency band of the first V2X service, where the layer-2 address pair of the first V2X service includes a source layer-2 address of the first V2X service and a destination layer-2 address of the first V2X service, and the layer-2 address pair of the first V2X service corresponds to the frequency band of the first V2X service. The transmit end sends data of the first V2X service to a receive end on the frequency band of the first V2X service based on the layer-2 address pair of the first V2X service.

Abstract: This application discloses a communications method and apparatus, to resolve a problem that a terminal device can still receive downlink LADN data when moving out of an LADN SA. The method includes: receiving, by a RAN node, a first message from an AMF node, where the first message includes specified area related information of a terminal device, and the specified area related information is used to indicate a specified area of the terminal device; and when the RAN node determines, based on the specified area related information and first location information of the terminal device, that the terminal device moves out of the specified area, sending, by the RAN node, the first location information or first indication information to the AMF node or an SMF node, where the first indication information is used to indicate that the terminal device already moves out of the specified area.

Abstract: A data processing method and a data processing apparatus are described that simplify an operation procedure in which an access and mobility management function (AMF) entity delivers a quality of service (QoS) parameter to an access network device to which the terminal device requests to connect or a target access network device to which the terminal device requests to be handed over, and reduce signaling overheads. The described method includes an access and mobility management function AMF entity receiving a quality of service QoS parameter used for a ProSe communication 5 (PC5) interface communication of a terminal device. The AMF entity stores the QoS parameter. When a preset condition is satisfied, the AMF entity sends the stored QoS parameter to a first access network device.

Abstract: A communication method and a communications apparatus, the method including obtaining, by a session management function entity, parameter information, determining, by the session management function entity, an access technology type for a protocol data unit (PDU) session of a terminal device according to the parameter information, and sending, by the session management function entity, indication information to an access and mobility management function entity, where the indication information indicates the access technology type of the PDU session.