CN112511989A

CN112511989A - Switching processing method, communication equipment and computer readable storage medium

Info

Publication number: CN112511989A
Application number: CN202011148244.6A
Authority: CN
Inventors: 王丽萍; 戚涛
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2020-10-23
Filing date: 2020-10-23
Publication date: 2021-03-16

Abstract

The application discloses a handover processing method, a communication device and a computer readable storage medium. The method comprises the following steps: sending first information to a third network node, where the first information is used to instruct the third network node to mark one of multicast service data packets received by a terminal device that is handed over from the first network node to the second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell; and acquiring second information sent by the third network node, wherein the second information comprises the information of the multicast service data packet marked by the third network node.

Description

Switching processing method, communication equipment and computer readable storage medium

Technical Field

The present application relates to wireless communication networks, and for example, to a handover processing method, a communication device, and a computer-readable storage medium.

Background

With the continuous development of wireless communication networks, wireless communication has played an increasingly important role in people's lives. Currently, in the technical research of the third Generation Partnership Project (3 GPP) on Multicast and Broadcast Service (MBS), the mobility of a terminal device is a basic functional point of research. In order to provide a high-performance broadcast service for a terminal device, how to ensure that data reception is not interrupted in a moving process of the terminal device becomes a problem which needs to be solved at present.

Disclosure of Invention

The application provides a handover processing method, a communication device and a computer readable storage medium, which can ensure that a terminal device does not receive a broadcast service continuously in a mobility process and improve system performance.

The embodiment of the application provides a handover processing method, which is applied to a first network node and comprises the following steps:

sending first information to a third network node, where the first information is used to instruct the third network node to mark one of multicast service data packets received by a terminal device that is handed over from the first network node to the second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell;

and acquiring second information sent by the third network node, wherein the second information comprises the information of the multicast service data packet marked by the third network node.

The embodiment of the application provides a handover processing method, which is applied to a second network node and comprises the following steps:

acquiring third information sent by the first network node, wherein the third information comprises information of a multicast service data packet marked by the third network node; or acquiring fifth information sent by the third network node, wherein the fifth information comprises information of the multicast service data packet marked by the third network node.

The embodiment of the application provides a handover processing method, which is applied to a third network node and comprises the following steps:

acquiring first information sent by a first network node, wherein the first information is used for indicating a third network node to mark one data packet in multicast service data packets received by a terminal device switched from the first network node to a second network node, and the first information comprises any one of the following combinations: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell;

marking one data packet in the multicast service data packets according to the first information and determining the information of the multicast service data packet marked by the third network node;

and sending second information to the first network node, wherein the second information comprises the information of the multicast service data packet marked by the third network node.

sending a switching request message to a second network node, wherein the switching request message is used for indicating the second network node to switch from the first network node to one data packet in multicast service data packets received by terminal equipment of the second network node for marking, and the switching request message comprises the maximum sequence number of the multicast service data packets acquired by the first network node from a third network node;

and acquiring a switching request response message sent by the second network node, wherein the switching request response message comprises the information of the multicast service data packet marked by the second network node.

acquiring a switching request message sent by a first network node, wherein the switching request message is used for indicating a second network node to switch from the first network node to one data packet in multicast service data packets received by terminal equipment of the second network node for marking, and the switching request message comprises a maximum serial number of the multicast service data packets acquired by the first network node from a third network node;

marking one data packet in the multicast service data packets according to the maximum serial number of the multicast service data packets acquired by the first network node from the third network node, and determining the information of the multicast service data packet marked by the second network node;

and sending a switching request response message to the first network node, wherein the switching request response message comprises the information of the multicast service data packet marked by the second network node.

The embodiment of the application provides a handover processing method, which is applied to terminal equipment and comprises the following steps:

acquiring a switching instruction message sent by a first network node;

and receiving the multicast service data packet sent by the second network node through unicast and broadcast according to the switching instruction message.

An embodiment of the present application provides a communication device, including: a processor; the processor is adapted to implement the method of any of the above embodiments when executing the computer program.

The embodiment of the present application further provides a computer-readable storage medium, which stores a computer program, and the computer program is executed by a processor to implement the method of any of the above embodiments.

With regard to the above embodiments and other aspects of the present application and implementations thereof, further description is provided in the accompanying drawings description, detailed description and claims.

Drawings

Fig. 1 is a flowchart illustrating a handover processing method according to an embodiment;

fig. 2 is a flowchart illustrating another handover processing method according to an embodiment;

fig. 3 is a flowchart illustrating a further handover processing method according to an embodiment;

fig. 4 is a flowchart illustrating a further handover processing method according to an embodiment;

fig. 5 is a flowchart illustrating a further handover processing method according to an embodiment;

fig. 6 is a flowchart illustrating yet another handover processing method according to an embodiment;

fig. 7 is an interaction diagram of a handover processing method according to an embodiment;

fig. 8 is an interaction diagram of another handover processing method according to an embodiment;

fig. 9 is an interaction diagram of another handover processing method according to an embodiment;

fig. 10 is an interaction diagram of another handover processing method according to an embodiment;

fig. 11 is an interaction diagram of a further handover processing method according to an embodiment;

fig. 12 is a schematic structural diagram of a handover processing apparatus according to an embodiment;

fig. 13 is a schematic structural diagram of another handover processing apparatus according to an embodiment;

fig. 14 is a schematic structural diagram of another handover processing apparatus according to an embodiment;

fig. 15 is a schematic structural diagram of another handover processing apparatus according to an embodiment;

fig. 16 is a schematic structural diagram of another handover processing apparatus according to an embodiment;

fig. 17 is a schematic structural diagram of yet another switching processing apparatus according to an embodiment;

fig. 18 is a schematic structural diagram of a base station according to an embodiment;

fig. 19 is a schematic structural diagram of a UE according to an embodiment.

Detailed Description

Hereinafter, embodiments of the present application will be described in detail with reference to the accompanying drawings.

Embodiments of the present application provide a mobile communication network (including but not limited to a fifth Generation mobile communication technology (5th Generation, 5G)), a network architecture of which may include terminal devices and network nodes, the network nodes including access network devices and core network devices. The terminal device is connected with the access network device in a wireless mode, and the terminal device can be fixed in position or movable. In the embodiment of the present application, a handover processing method, a communication device, and a computer-readable storage medium that can run on the network architecture are provided, which can ensure that a terminal device does not receive a broadcast service in a mobility process, and improve system performance.

The core network device is a device in a Core Network (CN) that provides service support for the terminal device. Currently, some examples of core network devices are: a 5G core network (5 GC), an access and mobility management function (AMF) entity, a Session Management Function (SMF) entity, a User Plane Function (UPF) entity, and so on, which are not listed herein. The AMF entity can be responsible for access management and mobility management of the terminal equipment; the SMF entity may be responsible for session management, such as session establishment for a user; the UPF entity may be a functional entity of the user plane, and is mainly responsible for connecting to an external network. It should be noted that, in the present application, an entity may also be referred to as a network element or a functional entity, for example, an AMF entity may also be referred to as an AMF network element or an AMF functional entity, and for example, an SMF entity may also be referred to as an SMF network element or an SMF functional entity, etc.

The access network device is an access device that the terminal device accesses to the mobile communication system in a wireless manner, and may be, but is not limited to, a base station (base station), an evolved NodeB (eNodeB), a Transmission Reception Point (TRP), a next generation NodeB (gNB) in a 5G mobile communication system, a base station in a future mobile communication system, or an access node in a WiFi system; or may be a module or a unit that performs part of the functions of the base station, for example, a Centralized Unit (CU) or a Distributed Unit (DU). The embodiment of the present application does not limit the specific technology and the specific device form adopted by the access network device. In this application, an access network device may be referred to as a network device for short, and if no special description is provided, the network devices are all referred to as access network devices.

A terminal device may also be referred to as a terminal, User Equipment (UE), a mobile station, a mobile terminal, etc. The terminal device can be a mobile phone, a tablet computer, a computer with a wireless transceiving function, a virtual reality terminal device, an augmented reality terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in remote operation, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home and the like. The embodiment of the present application does not limit the specific technology and the specific device form adopted by the terminal device.

The scheme provided by the embodiment of the present application is described below with reference to a first network node, a second network node, a third network node, and a terminal device. Illustratively, the terminal device is in the process of moving and is about to be handed over from a first network node to a second network node (i.e., a handover procedure is performed). The first network node and the second network node are access network devices (i.e., the first network node and the second network node are a source access network device and a target access network device, respectively), such as a gNB, a gNB-CU, and the like; the third network node is a core network device, such as AMF, UPF, 5GC, etc. In the description of the present application, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, nor order.

Fig. 1 shows a flowchart of a handover processing method according to an embodiment, and as shown in fig. 1, the method according to the embodiment is applied to a first network node (e.g., a gNB-CU, etc.), and includes the following steps.

S110, sending first information to a third network node, where the first information is used to instruct the third network node to mark one of multicast service data packets received by a terminal device that is switched from the first network node to the second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell.

In an embodiment, the first information uses MBS as a granularity or terminal equipment as a granularity.

And S120, acquiring second information sent by the third network node, wherein the second information comprises information of the multicast service data packet marked by the third network node.

In an embodiment, the information of the multicast Service data Packet marked by the third network node is a sequence Number, and the sequence Number is a Next Generation-User sequence Number (NG-U SN) or a General Packet Radio Service (GPRS) tunneling Protocol-User sequence Number (GTP-U SN).

In an embodiment, the method for acquiring the second information sent by the third network node in step S120 may include any one of the following two methods:

method a1, obtaining a first control plane control signaling sent by a third network node, where the first control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the next generation protocol interface identifier (AMF UE NGAP ID) allocated by the core network access and mobility management functional entity for the mobile terminal device, and the MBS session identifier; the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

Method A2, obtaining a first multicast service data packet of a user plane mark sent by a third network node, wherein an extended subheader of the first multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used for the first network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

In an embodiment, after step S120 is executed, the first network node may further send third information to the second network node, where the third information includes information of the multicast service data packet marked by the third network node.

Specifically, the third information is a second control plane control signaling, and the second control plane control signaling includes information of a multicast service data packet marked by a third network node; the information of the multicast service data packet marked by the third network node is used for the second network node to perform initial data packet indication of multicast service data caching for the terminal equipment.

In an embodiment, the first network node may further obtain multicast service packets sent by the third network node, where each multicast service packet has a sequence number.

The sequence number is located in a General Packet Radio Service (GPRS) Tunnel transmission Protocol-User (GTP-U) extension subheader or a Protocol Data Unit Session Container (PDU Session Container) extension subheader; the serial number is NG-U SN or GTP-U SN.

In an embodiment, the first network node may further send fourth information to the second network node, where the fourth information is a serial number STATUS TRANSFER control signaling, and the fourth information includes a serial number of a multicast service data packet that is forwarded by the first network node to the second network node for the terminal device; the serial number is NG-U SN or GTP-U SN.

Fig. 2 is a flowchart illustrating another handover processing method according to an embodiment, and as shown in fig. 2, the method according to the embodiment is applicable to a second network node (e.g., a gNB-CU, etc.), and includes the following steps.

S210, third information sent by the first network node is obtained, wherein the third information comprises information of a multicast service data packet marked by the third network node; or acquiring fifth information sent by the third network node, wherein the fifth information comprises information of the multicast service data packet marked by the third network node.

In an embodiment, the information of the multicast service data packet marked by the third network node is a sequence number, and the sequence number is NG-U SN or GTP-U SN.

In an embodiment, the third information is a second control plane control signaling, where the second control plane control signaling includes information of a multicast service packet marked by a third network node; the information of the multicast service data packet marked by the third network node is used for the second network node to perform initial data packet indication of multicast service data caching for the terminal equipment.

In an embodiment, the method for acquiring the fifth information sent by the third network node in step S210 may include any one of the following two methods:

method B1, obtaining a third control plane control signaling sent by the third network node, where the third control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, AMF UE NGAP ID and MBS session identification; the information of the multicast service data packet marked by the third network node is used for the second network node to perform initial data packet indication of multicast service data caching for the terminal equipment.

Method B2, obtaining a second multicast service data packet of the user plane mark sent by the third network node, wherein the extended subheader of the second multicast service data packet includes AMF UE NGAP ID and the information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used for the second network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the second network node to carry out the initial data packet indication of the multicast service data caching for the terminal equipment.

In an embodiment, the second network node may further obtain multicast service packets sent by the third network node, where each multicast service packet has a sequence number.

The sequence number is positioned in a GTP-U extension sub-header or a PDU Session Container extension sub-header; the serial number is NG-U SN or GTP-U SN.

In an embodiment, the second network node may further obtain fourth information sent by the first network node, where the fourth information is a serial number STATUS TRANSFER control signaling, and the fourth information includes a serial number of a multicast service data packet that is forwarded by the first network node to the second network node as the terminal device; the first network node is used for the second network node to determine the subsequent data packet of the forwarding data packet, and continuously sends the forwarding data packet and the subsequent data packet to the terminal equipment; the serial number is NG-U SN or GTP-U SN.

Fig. 3 is a flowchart illustrating a further handover processing method according to an embodiment, and as shown in fig. 3, the method according to this embodiment is applicable to a third network node (e.g., AMF, UPF, 5GC, etc.), and includes the following steps.

S310, acquiring first information sent by a first network node, where the first information is used to instruct a third network node to mark one of multicast service data packets received by a terminal device that is switched from the first network node to a second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell.

S320, according to the first information, marking one data packet in the multicast service data packets and determining the information of the multicast service data packet marked by the third network node.

S330, sending second information to the first network node, where the second information includes information of the multicast service data packet marked by the third network node.

In an embodiment, the method for sending the second information to the first network node in step S330 may include any one of the following two methods:

method C1, sending a first control plane control signaling to the first network node, the first control plane control signaling comprising any combination or one of: the information of the multicast service data packet marked by the third network node, AMF UE NGAP ID and MBS session identification; the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

Method C2, sending a first multicast service data packet marked by a user plane to a first network node, wherein an extended subheader of the first multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by a third network node; the AMF UE NGAP ID is used for the first network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

In an embodiment, the third network node may further send fifth information to the second network node, where the fifth information includes information of the multicast service data packet marked by the third network node.

Specifically, the method for the third network node to send the fifth information to the second network node may include any one of the following two methods:

method D1, sending a third control plane control signaling to the second network node, the third control plane control signaling comprising any combination or one of: the information of the multicast service data packet marked by the third network node, AMF UE NGAP ID and MBS session identification; the information of the multicast service data packet marked by the third network node is used for the second network node to perform initial data packet indication of multicast service data caching for the terminal equipment.

Method D2, sending a second multicast service data packet marked by the user plane to the second network node, wherein the extended subheader of the second multicast service data packet comprises AMF UE NGAP ID and the information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used for the second network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the second network node to carry out the initial data packet indication of the multicast service data caching for the terminal equipment.

In an embodiment, the third network node may further transmit multicast service packets to the first network node and the second network node, each multicast service packet having a sequence number.

Fig. 4 is a flowchart illustrating another handover processing method according to an embodiment, and as shown in fig. 4, the method according to the embodiment is applied to a first network node (e.g., a gNB-CU, etc.), and includes the following steps.

S410, sending a switching request message to the second network node, where the switching request message is used to indicate that the second network node switches from the first network node to one of the multicast service data packets received by the terminal device of the second network node for marking, and the switching request message includes a maximum sequence number of the multicast service data packet acquired by the first network node from the third network node.

In an embodiment, the maximum sequence number of the multicast service data packet acquired by the first network node is used by the second network node to determine the information of the multicast service data packet marked by the second network node.

S420, acquiring a handover request response message sent by the second network node, where the handover request response message includes information of the multicast service data packet marked by the second network node.

In an embodiment, the information of the multicast service data packet marked by the second network node is used for the first network node to indicate an end data packet for the terminal device to forward the multicast service data to the second network node.

In an embodiment, the information of the multicast service data packet marked by the second network node is a sequence number, and the sequence number is NG-U SN or GTP-U SN.

Fig. 5 is a flowchart illustrating a further handover processing method according to an embodiment, and as shown in fig. 5, the method according to this embodiment is applicable to a second network node (e.g., a gNB-CU, etc.), and includes the following steps.

S510, a switching request message sent by the first network node is obtained, where the switching request message is used to indicate that the second network node switches from the first network node to one of the multicast service data packets received by the terminal device of the second network node for marking, and the switching request message includes a maximum sequence number of the multicast service data packet obtained by the first network node from the third network node.

S520, according to the maximum serial number of the multicast service data packet acquired by the first network node from the third network node, marking one data packet in the multicast service data packet, and determining the information of the multicast service data packet marked by the second network node.

In an embodiment, the information of the multicast service data packet marked by the second network node is used for the second network node to perform an initial data packet indication of multicast service data caching for the terminal device.

S530, sending a handover request response message to the first network node, where the handover request response message includes information of the multicast service data packet marked by the second network node.

Fig. 6 shows a flowchart of yet another handover processing method provided in an embodiment, and as shown in fig. 6, the method provided in this embodiment is applicable to a terminal device (e.g., UE, etc.), and includes the following steps.

S610, acquiring a switching instruction message sent by the first network node.

And S620, receiving the multicast service data packet sent by the second network node through unicast and broadcast according to the switching instruction message.

In an embodiment, the terminal device may further send broadcast reception information to the second network node, where the broadcast reception information includes a sequence number of a multicast service Packet received by the terminal device first through broadcasting and a Packet Data Convergence Protocol (PDCP) sequence number.

Some exemplary embodiments are listed below for explaining the handover processing method provided in fig. 1 to fig. 6 in the embodiments of the present application, and the following exemplary embodiments may be executed singly or in combination.

In a first exemplary embodiment, fig. 7 shows an interaction diagram of a handover processing method provided in an embodiment, and as shown in fig. 7, the exemplary embodiment is applicable to a 5GC, a first gNB (source gNB) and a second gNB (target gNB), where both the first gNB and the second gNB support shared multicast broadcast service (shared MBS) transmission, that is, the first gNB and the second gNB may simultaneously receive the same broadcast service data from the 5GC and send the MBS service data to terminal devices served by themselves over the air (the number of terminal devices is greater than or equal to 1). The method comprises the following steps.

S710, 5GC transmit multicast service packets to the first and second gnbs, each multicast service packet having a sequence number.

In an embodiment, the 5GC simultaneously transmits the multicast traffic packet to the first and second gnbs.

S720, the first gNB obtains 5 the multicast service data packets sent by the GC, where each multicast service data packet has a sequence number.

S730, the second gNB obtains the multicast service data packets sent by the 5GC, where each multicast service data packet has a sequence number.

Specifically, the first gNB and the second gNB may respectively receive multicast service data packets uniformly numbered by the 5GC from a GTP-U pipe connected to the 5GC and dedicated to the shared MBS. The uniform number is NG-U SN or GTP-U SN, and the NG-U SN or the GTP-U SN is positioned in a GTP-U extension sub-header or a PDU Session Container extension sub-header. It usually takes 18 bits (bit) or two more bits can be added in the GTP-U extension subheader or PDU Session Container extension subheader for sequence number extension.

In a second exemplary embodiment, fig. 8 shows an interaction diagram of another handover processing method provided in an embodiment, and as shown in fig. 8, the exemplary embodiment is applicable to a 5GC, a first gNB (source gNB), a second gNB (target gNB), and a UE to be handed over (hereinafter, referred to as UE), where the first gNB and the second gNB both support shared multicast broadcast service (shared MBS) transmission, that is, the first gNB and the second gNB may receive the same broadcast service data from the 5GC at the same time and send the MBS service data to terminal devices served by themselves through an air interface (the number of terminal devices is greater than or equal to 1). The method comprises the following steps.

S8010, 5GC transmit multicast service packets to the first and second gnbs, each multicast service packet having a sequence number.

S8020, the first gNB obtains 5 multicast service packets sent by the GC, where each multicast service packet has a sequence number.

S8030, the second gNB obtains 5 multicast service packets sent by the GC, each multicast service packet having a sequence number.

S8040, the UE sends a measurement report message to the first gNB.

S8050, the first gNB receives the measurement report message sent by the UE, and sends a switching request message to the second gNB.

In a handover preparation phase, the UE and the first gNB are in a Radio Resource Control (RRC) connection state, and the UE sends a measurement report message to the first gNB. And after receiving the measurement report message, the first gNB makes a switching decision and sends a switching request message to the second gNB, wherein the switching request message mainly indicates the related information of the UE to be switched to the second gNB.

S8060, the second gNB receives the handover request message sent by the first gNB, and sends a handover request response message to the first gNB.

The handover request response message includes the relevant configuration information for the UE to access the second gNB.

S8070, the first gNB receives the handover request response message sent by the second gNB, and sends a handover indication message to the 5 GC.

The handover indication message may be the first information described in the above embodiment, and the handover indication message is used to instruct the 5GC to mark one of the multicast service data packets received from the UE that is handed over from the first gNB to the second gNB. The switching indication message comprises any combination or one of the following: user identification of the UE, identification of the second gNB and identification of the target cell.

The handover indication message may be of MBS granularity or UE granularity.

S8080, 5GC receives the handover indication message sent by the first gNB, marks one of the multicast service packets, and determines information of the multicast service packet marked by the 5 GC.

The information of the multicast service data packet marked by the 5GC is a sequence number, and the sequence number is NG-U SN or GTP-U SN.

The 5GC makes a decision inside the 5GC about information (usually, sequence number SN) of a multicast service data packet marked by the 5GC and to be sent to the first gNB and the second gNB for indicating the MBS service of the UE, and then notifies the first gNB and the second gNB to receive the multicast service data packet marked by the 5GC on a GTP-U pipe of shared MBS service connected to the 5GC, respectively (that is, the first gNB and the second gNB both receive the same marked data packet on the GTP-U pipe receiving the MBS service).

The S8090, 5GC sends second information to the first gNB, where the second information includes information of the multicast service packet marked by the 5 GC.

The 5GC may transmit the second information to the first gNB in a control plane CP-based manner or a data plane UP-based manner.

Specifically, the sending, by the 5GC, the second information to the first gNB in the control plane CP-based manner includes: sending a first control plane control signaling to the first gNB, wherein the first control plane control signaling comprises any combination or one of the following: 5GC marked multicast service data packet information, AMF UE NGAP ID, MBS conversation identification; the information of the multicast service data packet marked by the 5GC is used for the first gNB to indicate an end data packet for the UE to forward the multicast service data to the second gNB.

The sending, by the 5GC, the second information to the first gNB in a data plane UP-based manner includes: sending a first multicast service data packet marked by a user plane to a first gNB, wherein an extended subheader of the first multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by a 5 GC; the AMF UE NGAP ID is used for the first gNB to identify the switched UE, and the information of the multicast service data packet marked by the 5GC is used for the first gNB to indicate an end data packet for the UE to forward the multicast service data to the second gNB.

And S8100, the first gNB receives the second information sent by the 5 GC.

The first gNB may receive the second information sent by the 5GC in a control plane CP-based manner or a data plane UP-based manner.

Specifically, the receiving, by the first gNB, the second information sent by the 5GC in the control plane CP-based manner includes: receiving first control plane control signaling sent by the 5GC, wherein the first control plane control signaling comprises any combination or one of the following: 5GC marked multicast service data packet information, AMF UE NGAP ID, MBS conversation identification; the information of the multicast service data packet marked by the 5GC is used for the first gNB to indicate an end data packet for the UE to forward the multicast service data to the second gNB.

The first gNB receiving second information sent by the 5GC in a data plane UP-based mode comprises the following steps: receiving a first multicast service data packet marked by a user plane and sent by a 5GC, wherein an extended subheader of the first multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the 5 GC; the AMF UE NGAP ID is used for the first gNB to identify the switched UE, and the information of the multicast service data packet marked by the 5GC is used for the first gNB to indicate an end data packet for the UE to forward the multicast service data to the second gNB.

And the S8110 and the 5GC send fifth information to the second gNB, wherein the fifth information comprises the information of the multicast service data packet marked by the 5 GC.

The 5GC may transmit the fifth information to the second gNB in a control plane CP-based manner or a data plane UP-based manner.

Specifically, the sending, by the 5GC, the fifth information to the second gNB in the control plane CP-based manner includes: sending a third control plane control signaling to the second gNB, wherein the third control plane control signaling comprises any one or any combination of the following: 5GC marked multicast service data packet information, AMF UE NGAP ID, MBS conversation identification; the information of the multicast service data packet marked by the 5GC is used for the second gNB to perform initial data packet indication of multicast service data caching for the UE.

The sending, by the 5GC, the fifth information to the second gNB in the data plane UP-based manner includes: sending a second multicast service data packet marked by the user plane to a second gNB, wherein an extended subheader of the second multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by 5 GC; AMF UE NGAP ID is used for the second gNB to identify the switched UE, and the information of the multicast service data packet marked by the 5GC is used for the second gNB to perform initial data packet indication of multicast service data caching for the UE.

And S8120, the second gNB receives the fifth information sent by the 5 GC.

The second gNB may receive the fifth information sent by the 5GC in a control plane CP-based manner or a data plane UP-based manner.

Specifically, the receiving, by the second gNB, the fifth information sent by the 5GC in the control plane CP-based manner includes: receiving third control plane control signaling sent by the 5GC, wherein the third control plane control signaling comprises any combination or one of the following: 5GC marked multicast service data packet information, AMF UE NGAP ID, MBS conversation identification; the information of the multicast service data packet marked by the 5GC is used for the second gNB to perform initial data packet indication of multicast service data caching for the UE.

The receiving, by the second gNB, the fifth information sent by the 5GC in a data plane UP-based manner includes: receiving a second multicast service data packet marked by a user plane and sent by a 5GC, wherein an extended subheader of the second multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the 5 GC; AMF UE NGAP ID is used for the second gNB to identify the switched UE, and the information of the multicast service data packet marked by the 5GC is used for the second gNB to perform initial data packet indication of multicast service data caching for the UE.

The information of the multicast service data packet marked by the 5GC is used for the first gNB to indicate an end data packet for the UE to forward the multicast service data to the second gNB on the first gNB side; and the second gNB side is used for indicating the starting data packet of the multicast service data caching for the UE by the second gNB. Therefore, the continuity of data reception of the UE in the switching process is ensured through the multicast service data packet marked by the 5GC, and lossless transmission is realized.

S8130, the first gNB sends a switching instruction message to the UE.

S8140, the UE receives the switching instruction message sent by the first gNB, disconnects the first gNB and completes synchronization with the second gNB.

S8150, the first gNB sends fourth information to the second gNB.

The fourth information is a serial number state transmission SN STATUS TRANSFER control signaling, and the fourth information comprises a serial number of a multicast service data packet which is forwarded by the first gNB to the second gNB for the UE; the serial number is NG-U SN or GTP-U SN.

In the handover execution process, the UE initiates a random access process to the second gNB, and the first gNB forwards data to the second gNB, where the forwarded data includes: data packets that the first gNB has sent to the UE but has not acknowledged, and data packets that the first gNB has received from the 5GC but has not sent to the UE. Specifically, after receiving the information of the multicast service data packet marked by the 5GC, the first gNB takes the multicast service data packet marked by the 5GC as an end data packet, counts the sending condition of the data packet before the corresponding air interface PDCP SN, determines the PDCP SN of the data packet of which the UE starts not to respond (ACK), and sends an SN STATUS TRANSFER control signaling to the second gNB.

The SN STATUS TRANSFER control signaling may include sequence numbers of multicast service data packets forwarded by the first gNB to the second gNB, and may further include a correspondence between the sequence numbers of the data packets and PDCP SNs.

Optionally, the sequence number of the multicast service packet forwarded by the first gNB to the second gNB may also be carried in a GTP-U extension subheader of the forwarding packet.

S8160, the second gNB receives the fourth information sent by the first gNB.

The fourth information is a serial number state transmission SN STATUS TRANSFER control signaling, and the fourth information comprises a serial number of a multicast service data packet which is forwarded by the first gNB to the second gNB for the UE; the first gNB is used for the second gNB to determine a subsequent data packet of the forwarded data packet, and continuously sends the forwarded data packet and the subsequent data packet to the UE; the serial number is NG-U SN or GTP-U SN.

S8170, the UE receives the multicast service data packet sent by the second gNB through unicast and broadcast.

The data unicast sent to the UE by the second gNB includes a data packet forwarded by the first gNB to the second gNB and a data packet buffered by the second gNB for the UE. Meanwhile, the UE may also receive the multicast service data packet sent by the second gNB through broadcasting.

And the second gNB determines a termination data packet for transmitting data to the UE in a unicast mode according to the broadcast data receiving situation of the UE, determines the time for stopping the unicast transmission to the UE, and then continues to provide services to the UE through multicast.

S8180, the second gNB transmits a path switching indication message to the 5 GC.

And S8190 and 5GC receive the path switching indication message sent by the second gNB and send a path switching confirmation response message to the second gNB.

S8200, the second gNB receives the path switching confirmation response message sent by the 5GC, and sends a UE CONTEXT Release message to the first gNB.

The UE CONTEXT Release message instructs the first gNB to Release the CONTEXT related to the UE, thereby completing the handover procedure.

In a third exemplary embodiment, fig. 9 shows an interaction diagram of another handover processing method provided in an embodiment, and as shown in fig. 9, the exemplary embodiment is applicable to a 5GC, a first gNB (source gNB), a second gNB (target gNB), and a UE to be handed over (hereinafter, referred to as UE), where the first gNB and the second gNB both support shared multicast broadcast service (shared MBS) transmission, that is, the first gNB and the second gNB may simultaneously receive the same broadcast service data from the 5GC and send the MBS service data to terminal devices served by themselves over the air (the number of terminal devices is greater than or equal to 1). The method comprises the following steps.

S9010, 5GC sends multicast service packets to the first and second gnbs, each multicast service packet having a sequence number.

S9020, the first gNB obtains 5 GC-sent multicast service data packets, where each multicast service data packet has a sequence number.

S9030, the second gNB obtains 5 GC-sent multicast service data packets, each multicast service data packet having a sequence number.

S9040, the UE sends a measurement report message to the first gNB.

S9050, the first gNB receives a measurement report message sent by the UE and sends a switching indication message to the 5 GC.

And the UE and the first gNB are in an RRC connection state, and the UE sends a measurement report message to the first gNB. And after receiving the measurement report message, the first gNB makes a switching decision and sends a switching indication message to the 5 GC.

The handover indication message may be of MBS granularity or UE granularity.

S9060 and 5GC receive the switching indication message sent by the first gNB, mark one data packet in the multicast service data packets and determine the information of the multicast service data packet marked by the 5 GC.

The S9070 and 5GC send second information to the first gNB, where the second information includes information of the multicast service packet marked by the 5 GC.

S9080, the first gNB receives the second information sent by the 5 GC.

And S9090, the first gNB sends third information to the second gNB, wherein the third information comprises the information of the multicast service data packet marked by the 5 GC.

Specifically, the third information is a second control plane control signaling, and the second control plane control signaling includes information of a multicast service data packet marked by 5 GC; the information of the multicast service data packet marked by the 5GC is used for the second gNB to perform initial data packet indication of multicast service data caching for the UE.

In an embodiment, the second control plane control signaling may be a handover request message, and the handover request message may further indicate information about a UE to be handed over to the second gNB.

S9100, the second gNB receives the third information sent by the first gNB, and sends a handover request response message to the first gNB.

S9110, the first gNB receives the handover request response message sent by the second gNB, and sends a handover instruction message to the UE.

S9120, the UE receives the handover instruction message sent by the first gNB, disconnects the first gNB, and completes synchronization with the second gNB.

S9130, the first gNB sends the fourth information to the second gNB.

S9140, the second gNB receives the fourth information sent by the first gNB.

S9150, the UE receives the multicast service data packet sent by the second gNB through unicast and broadcast.

S9160, the second gNB sends a path switch indication message to the 5 GC.

S9170, 5GC receives the path switch indication message sent by the second gNB, and sends a path switch confirmation response message to the second gNB.

S9180, the second gNB receives the path switch confirmation response message sent by the 5GC, and sends a UE CONTEXT Release message to the first gNB.

In a fourth exemplary embodiment, fig. 10 shows an interaction diagram of another handover processing method provided in an embodiment, and as shown in fig. 10, the exemplary embodiment is applicable to a 5GC, a first gNB (source gNB), a second gNB (target gNB), and a UE to be handed over (hereinafter, referred to as UE), where the first gNB and the second gNB both support shared multicast broadcast service (shared MBS) transmission, that is, the first gNB and the second gNB may receive the same broadcast service data from the 5GC and send the MBS service data to terminal devices served by themselves through an air interface (the number of terminal devices is greater than or equal to 1). Considering the case that the speeds of receiving data by the first gbb and the second gbb are not consistent, which results in inconsistent air interface sending speeds, when the first gbb air interface sending speed is less than or equal to the second gbb air interface sending speed, if lossless transmission is to be achieved, the second gbb needs to send data to the first gbb (i.e. the first gbb is allowed to forward the data). The method comprises the following steps.

S1010, 5GC sends multicast service packets to the first and second gnbs, each multicast service packet having a sequence number.

S1020, the first gNB obtains multicast service data packets sent by the 5GC, where each multicast service data packet has a sequence number.

S1030, the second gNB obtains 5 GC-transmitted multicast service data packets, where each multicast service data packet has a sequence number.

S1040, the UE sends a measurement report message to the first gNB.

S1050, the first gNB receives the measurement report message sent by the UE, and sends a switching request message to the second gNB.

The handover request message is used for indicating that the second gNB switches from the first gNB to one of the multicast service data packets received by the UE of the second gNB for marking, and the handover request message includes the maximum sequence number of the multicast service data packet acquired by the first gNB from the 5 GC. The handover request message also indicates information about the UE to be handed over to the second gNB.

The maximum sequence number of the multicast service data packet acquired by the first gNB from the 5GC is used by the second gNB to determine the information of the multicast service data packet marked by the second gNB. That is, the second gNB determines how fast the first gNB receives the same packet from the 5GC than the second gNB, and determines whether to perform packet buffering for the UE.

S1060, the second gNB marks one of the multicast service data packets according to the maximum sequence number of the multicast service data packet obtained by the first gNB from the 5GC, and determines information of the multicast service data packet marked by the second gNB.

The information of the multicast service data packet marked by the second gNB is used for the second gNB to perform initial data packet indication of multicast service data caching for the UE.

And the information of the multicast service data packet marked by the second gNB is a sequence number, and the sequence number is NG-U SN or GTP-U SN.

The second gNB knows that the rate at which the first gNB receives the data packet from the 5GC is slower, that is, part of data is not transmitted by the first gNB, but the second gNB has already transmitted the data packet on the air interface. In this case, the second gNB requires data forwarding by the first gNB to be possible to guarantee lossless reception by the UE. Meanwhile, the second gNB starts buffering data packets for the UE, and sends a start sequence number for buffering the data packets for the UE (e.g., the sequence number of the largest data packet received by the second gNB from the 5GC is selected as information of the multicast service data packet marked by the second gNB) to the first gNB through a handover request response message.

S1070, the second gNB sends a handover request response message to the first gNB, where the handover request response message includes information of the multicast service data packet marked by the second gNB.

The handover request response message may also include relevant configuration information for UE access to the second gNB.

And S1080, the first gNB receives the switching request response message sent by the second gNB and sends a switching instruction message to the UE.

And S1090, the UE receives the switching instruction message sent by the first gNB, disconnects the first gNB and completes synchronization with the second gNB.

S1100, the first gbb sends an SN STATUS TRANSFER control signaling to the second gbb.

The information of the multicast service data packet marked by the second gNB is used for the first gNB to indicate an end data packet for the UE to forward the multicast service data to the second gNB.

The first gNB performs data forwarding to the second gNB, wherein the forwarded data comprises: data packets that the first gNB has sent to the UE but has not acknowledged, and data packets that the first gNB has received from the 5GC but has not sent to the UE. Since the first gNB is slower than the second gNB in data transmission, the data packet that the first gNB needs to forward to the second gNB should use the sequence number carried by the second gNB in the handover request response message as the termination data packet.

For example, the first gNB in the handover request message indicates that the maximum sequence number of the multicast service packet received from the 5GC is X, and the maximum sequence number received by the second gNB is Y (Y > X). Then the second gNB buffers data for the handover UE starting from Y and sends Y to the first gNB via a handover request response message. The data packet forwarded by the first gNB to the second gNB is to be terminated by Y. The SN STATUS TRANSFER control signaling needs to include COUNT information of a data packet forwarded by the first gbb to the second gbb, and also needs to include a corresponding relationship between the Ng-U SN of the forwarded data packet and the PDCP SN.

S1110, the second gbb receives the SN STATUS TRANSFER control signaling sent by the first gbb.

S1120, the UE receives the multicast service data packet sent by the second gNB through unicast and broadcast.

S1130, the second gNB transmits a path switch indication message to the 5 GC.

S1140, 5GC receives the path switch indication message sent by the second gNB and sends a path switch acknowledgement response message to the second gNB.

S1150, the second gNB receives the path switch confirmation response message sent by the 5GC, and sends a UE CONTEXT Release message to the first gNB.

In a fifth exemplary embodiment, fig. 11 shows an interaction diagram of a further handover processing method provided in an embodiment, and as shown in fig. 11, the exemplary embodiment is applicable to a 5GC, a first gNB (source gNB), a second gNB (target gNB), and a UE to be handed over (hereinafter, referred to as UE), where the first gNB and the second gNB both support shared multicast broadcast service (shared MBS) transmission, that is, the first gNB and the second gNB may receive the same broadcast service data from the 5GC and send the MBS service data to terminal devices served by themselves over the air (the number of terminal devices is greater than or equal to 1). Considering the situation that the speeds of receiving data by the first gNB and the second gNB are inconsistent, thereby causing the speeds of sending over the air interface to be inconsistent, when the sending speed of the first gNB over the air interface is higher than the sending speed of the second gNB over the air interface. The method comprises the following steps.

S2010, 5GC send multicast traffic packets to the first and second gnbs, each multicast traffic packet having a sequence number.

S2020, the first gNB obtains multicast service packets sent by the 5GC, where each multicast service packet has a sequence number.

S2030, the second gNB obtains 5 multicast service packets sent by the GC, where each multicast service packet has a sequence number.

S2040, the UE sends a measurement report message to the first gNB.

S2050, the first gNB receives the measurement report message sent by the UE, and sends a handover request message to the second gNB.

S2060, the second gNB marks one of the multicast service data packets according to the maximum sequence number of the multicast service data packet acquired by the first gNB from the 5GC, and determines the information of the multicast service data packet marked by the second gNB.

The second gNB knows that the rate at which the first gNB receives the data packet from the 5GC is faster, that is, there is some data that the second gNB has not started to transmit, but the first gNB has already transmitted on the air. In this case, the second gNB may guarantee lossless reception for the UE as long as it starts buffering data for the UE in time. Meanwhile, the second gNB sets a data packet as a data packet for starting to buffer the data packet for the handover UE (the sequence number of the data packet should be larger than the maximum sequence number indicated by the first gNB in the handover request message), and sends the sequence number to the first gNB through the handover request response message, so that the data packet corresponding to the sequence number is taken as a termination data packet for data forwarding by the first gNB.

S2070, the second gNB sends a handover request response message to the first gNB, where the handover request response message includes information of the multicast service data packet marked by the second gNB.

S2080, the first gNB receives the switching request response message sent by the second gNB and sends a switching instruction message to the UE.

S2090, the UE receives the handover instruction message sent by the first gNB, disconnects the connection with the first gNB, and completes synchronization with the second gNB.

S2100, the first gbb sends an SN STATUS TRANSFER control signaling to the second gbb.

The first gNB performs data forwarding to the second gNB, wherein the forwarded data comprises: data packets that the first gNB has sent to the UE but has not acknowledged, and data packets that the first gNB has received from the 5GC but has not sent to the UE. Since the first gNB is faster than the second gNB in data transmission, the data packet that the first gNB needs to forward to the second gNB should use the sequence number carried by the second gNB in the handover request response message as the termination data packet.

For example, the first gNB in the handover request message indicates that the maximum sequence number of the multicast service packet received from the 5GC is X, and the maximum sequence number received by the second gNB is Z (Z < X). Then the second gNB has a sequence number M (M > X) of the multicast service data packet marked by the second gNB, and then the second gNB buffers data for the handover UE from M, and the first gNB forwards data up to M. The SN STATUS TRANSFER control signaling needs to include COUNT information of a data packet forwarded by the first gbb to the second gbb, and also needs to include a corresponding relationship between the Ng-U SN of the forwarded data packet and the PDCP SN.

S2110, the second gbb receives the SN STATUS TRANSFER control signaling sent by the first gbb.

And S2120, the UE receives the multicast service data packet sent by the second gNB through unicast and broadcast.

S2130, the second gNB sends a path switch indication message to the 5 GC.

S2140 and 5GC receive the path switch indication message sent by the second gNB and send a path switch acknowledgement response message to the second gNB.

S2150, the second gNB receives the path switch acknowledgement response message sent by the 5GC, and sends a UE CONTEXT Release message to the first gNB.

Fig. 12 is a schematic structural diagram of a handover processing apparatus according to an embodiment, where the apparatus may be configured in a first network node, as shown in fig. 12, including: a transmitting module 10 and a receiving module 11.

A sending module, configured to send first information to a third network node, where the first information is used to instruct the third network node to mark one of multicast service data packets received by a terminal device that is switched from the first network node to the second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell.

The receiving module 11 is configured to acquire second information sent by the third network node, where the second information includes information of the multicast service data packet marked by the third network node.

The switching processing apparatus provided in this embodiment is a switching processing method for implementing the foregoing embodiment, and the implementation principle and technical effect of the switching processing apparatus provided in this embodiment are similar to those of the foregoing embodiment, and are not described herein again.

In an embodiment, the information of the multicast service data packet marked by the third network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

In an embodiment, the receiving module 11 is configured to acquire a first control plane control signaling sent by a third network node, where the first control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

In an embodiment, the receiving module 11 is configured to obtain a first multicast service packet of a user plane identifier sent by a third network node, where an extended subheader of the first multicast service packet includes an AMF UE NGAP ID and information of the multicast service packet identified by the third network node; the AMF UE NGAP ID is used for the first network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

In an embodiment, the sending module 10 is further configured to send third information to the second network node, where the third information includes information of the multicast service data packet marked by the third network node.

In an embodiment, the receiving module 11 is further configured to obtain multicast service data packets sent by the third network node, where each multicast service data packet has a sequence number.

In one embodiment, the sequence number is located in the gprs tunnelling protocol-user GTP-U extension subheader or in the PDU Session Container extension subheader; the serial number is NG-U SN or GTP-U SN.

In an embodiment, the sending module 10 is further configured to send fourth information to the second network node, where the fourth information is a serial number STATUS TRANSFER control signaling, and the fourth information includes a serial number of a multicast service data packet that is forwarded by the first network node to the second network node for the terminal device; the serial number is NG-U SN or GTP-U SN.

Fig. 13 is a schematic structural diagram of another handover processing apparatus according to an embodiment, where the apparatus may be configured in a second network node, as shown in fig. 13, including: a receiving module 20.

The receiving module 20 is configured to acquire third information sent by the first network node, where the third information includes information of a multicast service data packet marked by the third network node; or acquiring fifth information sent by the third network node, wherein the fifth information comprises information of the multicast service data packet marked by the third network node.

In an embodiment, the receiving module 20 is configured to acquire a third control plane control signaling sent by a third network node, where the third control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the second network node to perform initial data packet indication of multicast service data caching for the terminal equipment.

In an embodiment, the receiving module 20 is configured to obtain a second multicast service packet of a user plane identifier sent by a third network node, where an extended subheader of the second multicast service packet includes an AMF UE NGAP ID and information of the multicast service packet identified by the third network node; the AMF UE NGAP ID is used for the second network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the second network node to carry out the initial data packet indication of the multicast service data caching for the terminal equipment.

In an embodiment, the receiving module 20 is further configured to obtain multicast service data packets sent by the third network node, where each multicast service data packet has a sequence number.

In an embodiment, the receiving module 20 is further configured to obtain fourth information sent by the first network node, where the fourth information is a serial number STATUS TRANSFER control signaling, and the fourth information includes a serial number of a multicast service data packet that is forwarded by the first network node to the second network node as the terminal device; the first network node is used for the second network node to determine the subsequent data packet of the forwarding data packet, and continuously sends the forwarding data packet and the subsequent data packet to the terminal equipment; the serial number is NG-U SN or GTP-U SN.

Fig. 14 is a schematic structural diagram of another handover processing apparatus according to an embodiment, which may be configured in a third network node, as shown in fig. 14, including: a receiving module 30, a processing module 31 and a sending module 32.

The receiving module 30 is configured to acquire first information sent by a first network node, where the first information is used to instruct a third network node to mark one of multicast service data packets received by a terminal device that is switched from the first network node to a second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell.

The processing module 31 is configured to mark one of the multicast service packets and determine information of the multicast service packet marked by the third network node according to the first information.

The sending module 32 is configured to send second information to the first network node, where the second information includes information of the multicast service data packet marked by the third network node.

In an embodiment, the sending module 32 is configured to send the first control plane control signaling to the first network node, where the first control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

In an embodiment, the sending module 32 is configured to send a first multicast service packet marked by a user plane to the first network node, where an extended subheader of the first multicast service packet includes an AMF UE NGAP ID and information of the multicast service packet marked by the third network node; the AMF UE NGAP ID is used for the first network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal equipment to forward the multicast service data to the second network node.

In an embodiment, the sending module 32 is further configured to send fifth information to the second network node, where the fifth information includes information of the multicast service data packet marked by the third network node.

In an embodiment, the sending module 32 is configured to send a third control plane control signaling to the second network node, where the third control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the second network node to perform initial data packet indication of multicast service data caching for the terminal equipment.

In an embodiment, the sending module 32 is configured to send a second multicast service packet marked by a user plane to the second network node, where an extended subheader of the second multicast service packet includes an AMF UE NGAP ID and information of the multicast service packet marked by the third network node; the AMF UE NGAP ID is used for the second network node to identify the terminal equipment, and the information of the multicast service data packet marked by the third network node is used for the second network node to carry out the initial data packet indication of the multicast service data caching for the terminal equipment.

In an embodiment, the sending module 32 is further configured to send multicast service packets to the first network node and the second network node, where each multicast service packet has a sequence number.

Fig. 15 is a schematic structural diagram of another handover processing apparatus according to an embodiment, which may be configured in a first network node, as shown in fig. 15, including: a transmitting module 40 and a receiving module 41.

The sending module 40 is configured to send a switching request message to the second network node, where the switching request message is used to indicate that the second network node switches from the first network node to one of the multicast service data packets received by the terminal device of the second network node to perform marking, and the switching request message includes a maximum sequence number of the multicast service data packet acquired by the first network node from the third network node.

The receiving module 41 is configured to obtain a handover request response message sent by the second network node, where the handover request response message includes information of the multicast service data packet marked by the second network node.

In an embodiment, the information of the multicast service data packet marked by the second network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

Fig. 16 is a schematic structural diagram of a further handover processing apparatus according to an embodiment, where the apparatus may be configured in a second network node, as shown in fig. 16, including: a receiving module 50, a processing module 51 and a transmitting module 52.

The receiving module 50 is configured to acquire a handover request message sent by a first network node, where the handover request message is used to indicate that a second network node switches from the first network node to one of multicast service data packets received by a terminal device of the second network node for marking, and the handover request message includes a maximum sequence number of the multicast service data packet acquired by the first network node from a third network node.

The processing module 51 is configured to mark one of the multicast service data packets according to the maximum sequence number of the multicast service data packet acquired by the first network node from the third network node, and determine information of the multicast service data packet marked by the second network node.

The sending module 52 is configured to send a handover request response message to the first network node, where the handover request response message includes information of the multicast service data packet marked by the second network node.

Fig. 17 is a schematic structural diagram of another handover processing apparatus according to an embodiment, where the apparatus may be configured in a terminal device, as shown in fig. 17, including: a receiving module 60 and a transmitting module 61.

A receiving module 60 configured to obtain a switching instruction message sent by a first network node; and receiving the multicast service data packet sent by the second network node through unicast and broadcast according to the switching instruction message.

In an embodiment, the sending module 61 is configured to send broadcast reception information to the second network node, where the broadcast reception information includes a sequence number of a multicast service packet received by the terminal device first by broadcasting and a packet data convergence protocol PDCP sequence number.

An embodiment of the present application further provides a communication device, including: a processor for implementing a method as provided in any of the embodiments of the present application when executing a computer program. Specifically, the device may be a core network device provided in any embodiment of the present application, a terminal device provided in any embodiment of the present application, or an access network device provided in any embodiment of the present application, which is not limited in this application.

For example, the following embodiments provide a schematic structural diagram of a device as a base station and a UE.

Fig. 18 is a schematic structural diagram of a base station according to an embodiment, and as shown in fig. 18, the base station includes a processor 60, a memory 61, and a communication interface 62; the number of the processors 60 in the base station may be one or more, and one processor 60 is taken as an example in fig. 18; the processor 60, the memory 61 and the communication interface 62 in the base station may be connected by a bus or other means, and the bus connection is exemplified in fig. 18. A bus represents one or more of any of several types of bus structures, including a memory bus or memory controller, a peripheral bus, an accelerated graphics port, and a processor or local bus using any of a variety of bus architectures.

The memory 61, as a computer-readable storage medium, may be configured to store software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the methods in the embodiments of the present application. The processor 60 executes at least one functional application of the base station and data processing by executing software programs, instructions and modules stored in the memory 61, i.e. implements the above-mentioned method.

The memory 61 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal, and the like. Further, the memory 61 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, memory 61 may include memory located remotely from processor 60, which may be connected to a base station through a network. Examples of such networks include, but are not limited to, the internet, intranets, networks, mobile communication networks, and combinations thereof.

The communication interface 62 may be configured for the reception and transmission of data.

Fig. 19 is a schematic diagram illustrating a UE according to an embodiment, which may be implemented in various forms, and the UE in this application may include, but is not limited to, a mobile terminal Device such as a mobile phone, a smart phone, a notebook computer, a Digital broadcast receiver, a Personal Digital Assistant (PDA), a tablet computer (PAD), a Portable Media Player (PMP), a navigation Device, a vehicle-mounted terminal Device, a vehicle-mounted display terminal, a vehicle-mounted electronic rear view mirror, and a fixed terminal Device such as a Digital Television (TV), a desktop computer, and the like.

As shown in fig. 19, the UE 50 may include a wireless communication unit 51, an Audio/Video (a/V) input unit 52, a user input unit 53, a sensing unit 54, an output unit 55, a memory 56, an interface unit 57, a processor 58, and a power supply unit 59, and the like. Fig. 19 shows a UE including various components, but it is understood that not all of the illustrated components are required to be implemented. More or fewer components may alternatively be implemented.

In the present embodiment, the wireless communication unit 51 allows radio communication between the UE 50 and a base station or a network. The a/V input unit 52 is arranged to receive audio or video signals. The user input unit 53 may generate key input data to control various operations of the UE 50 according to commands input by the user. The sensing unit 54 detects a current state of the UE 50, a position of the UE 50, presence or absence of a touch input by a user to the UE 50, an orientation of the UE 50, acceleration or deceleration movement and direction of the UE 50, and the like, and generates a command or signal for controlling an operation of the UE 50. The interface unit 57 serves as an interface through which at least one external device is connected with the UE 50. The output unit 55 is configured to provide output signals in a visual, audio, and/or tactile manner. The memory 56 may store software programs or the like for processing and controlling operations performed by the processor 58, or may temporarily store data that has been or will be output. The memory 56 may include at least one type of storage medium. Also, the UE 50 may cooperate with a network storage device that performs the storage function of the memory 56 through a network connection. The processor 58 generally controls the overall operation of the UE 50. The power supply unit 59 receives external power or internal power and provides appropriate power required to operate various elements and components under the control of the processor 58.

The processor 58 executes the program stored in the memory 56 to execute at least one functional application and data processing, for example, to implement the methods provided by the embodiments of the present application.

Embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method provided in any of the embodiments of the present application.

The computer storage media of the embodiments of the present application may take any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer-readable storage medium may be, for example but not limited to: an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination thereof. Computer-readable storage media include (a non-exhaustive list): an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (EPROM), a flash Memory, an optical fiber, a portable Compact Disc Read-Only Memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the present application, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present disclosure may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + +, Ruby, Go, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of Network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the internet using an internet service provider).

It will be clear to a person skilled in the art that the term user terminal covers any suitable type of wireless user equipment, such as a mobile phone, a portable data processing device, a portable web browser or a car mounted mobile station.

In general, the various embodiments of the application may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. For example, some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device, although the application is not limited thereto.

Embodiments of the application may be implemented by a data processor of a mobile device executing computer program instructions, for example in a processor entity, or by hardware, or by a combination of software and hardware. The computer program instructions may be assembly instructions, Instruction Set Architecture (ISA) instructions, machine-related instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages.

Any logic flow block diagrams in the figures of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored on a memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, Read Only Memory (ROM), Random Access Memory (RAM), optical storage devices and systems (digital versatile disks, DVDs, or CD discs), etc. The computer readable medium may include a non-transitory storage medium. The data processor may be of any type suitable to the local technical environment, such as but not limited to general purpose computers, special purpose computers, microprocessors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Programmable logic devices (FGPAs), and processors based on a multi-core processor architecture.

Claims

1. A handover processing method applied to a first network node includes:

sending first information to a third network node, where the first information is used to instruct the third network node to mark one of multicast service data packets received by a terminal device that is handed over from the first network node to a second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell;

and acquiring second information sent by the third network node, wherein the second information comprises information of the multicast service data packet marked by the third network node.

2. The method according to claim 1, wherein the information of the multicast service data packet marked by the third network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

3. The method of claim 1, wherein obtaining the second information sent by the third network node comprises:

obtaining a first control plane control signaling sent by the third network node, where the first control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal device to forward the multicast service data to the second network node.

4. The method of claim 1, wherein obtaining the second information sent by the third network node comprises:

acquiring a first multicast service data packet marked by a user plane and sent by the third network node, wherein an extended subheader of the first multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used by the first network node to identify the terminal device, and the information of the multicast service packet marked by the third network node is used by the first network node to indicate an end packet for forwarding the multicast service data to the second network node by the terminal device.

5. The method of claim 1, further comprising:

and sending third information to the second network node, wherein the third information comprises the information of the multicast service data packet marked by the third network node.

6. The method of claim 5, wherein the third information is second control plane control signaling, and the second control plane control signaling comprises information of a multicast service packet marked by the third network node; the information of the multicast service data packet marked by the third network node is used for the second network node to indicate an initial data packet of multicast service data caching for the terminal equipment.

7. The method of claim 1, further comprising:

and acquiring multicast service data packets sent by the third network node, wherein each multicast service data packet has a sequence number.

8. The method of claim 7, wherein the sequence number is located in a general packet radio service tunneling protocol-user GTP-U extension subheader or a protocol data unit Session Container PDU Session Container extension subheader; the serial number is NG-U SN or GTP-U SN.

9. The method of claim 1, further comprising:

sending fourth information to the second network node, where the fourth information is a serial number STATUS transport SN TRANSFER control signaling, and the fourth information includes a serial number of a multicast service data packet that is forwarded by the first network node to the second network node for the terminal device; the serial number is NG-U SN or GTP-U SN.

10. A handover processing method applied to a second network node includes:

acquiring third information sent by a first network node, wherein the third information comprises information of a multicast service data packet marked by a third network node; or acquiring fifth information sent by a third network node, where the fifth information includes information of a multicast service data packet marked by the third network node.

11. The method according to claim 10, wherein the information of the multicast service data packet marked by the third network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

12. The method of claim 10, wherein the third information is second control plane control signaling, and the second control plane control signaling comprises information of a multicast service packet marked by the third network node; the information of the multicast service data packet marked by the third network node is used for the second network node to indicate an initial data packet of multicast service data caching for the terminal equipment.

13. The method of claim 10, wherein obtaining fifth information sent by a third network node comprises:

acquiring a third control plane control signaling sent by the third network node, where the third control plane control signaling includes any combination or one of the following: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the second network node to indicate an initial data packet of multicast service data caching for the terminal equipment.

14. The method of claim 10, wherein obtaining fifth information sent by a third network node comprises:

acquiring a second multicast service data packet marked by a user plane and sent by the third network node, wherein an extended subheader of the second multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used by the second network node to identify the terminal device, and the information of the multicast service packet marked by the third network node is used by the second network node to indicate an initial packet for performing multicast service data caching for the terminal device.

15. The method of claim 10, further comprising:

16. The method of claim 15, wherein the sequence number is located in a general packet radio service tunneling protocol-user GTP-U extension subheader or a protocol data unit Session Container PDU Session Container extension subheader; the serial number is NG-U SN or GTP-U SN.

17. The method of claim 10, further comprising:

acquiring fourth information sent by the first network node, wherein the fourth information is a serial number state transport SN STATUS TRANSFER control signaling, and the fourth information includes a serial number of a multicast service data packet that is forwarded by the first network node to the second network node for the terminal device; the first network node is used for the second network node to determine a subsequent data packet of a forwarding data packet for the serial number of the multicast service data packet forwarded by the terminal device to the second network node, and continuously sends the forwarding data packet and the subsequent data packet to the terminal device; the serial number is NG-U SN or GTP-U SN.

18. A handover processing method applied to a third network node includes:

acquiring first information sent by a first network node, where the first information is used to instruct a third network node to mark one of multicast service data packets received by a terminal device that is switched from the first network node to a second network node, and the first information includes any combination or one of the following: the user identification of the terminal equipment, the identification of the second network node and the identification of the target cell;

19. The method according to claim 18, wherein the information of the multicast service data packet marked by the third network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

20. The method of claim 18, wherein sending second information to the first network node comprises:

sending a first control plane control signaling to the first network node, the first control plane control signaling comprising any combination or one of: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the first network node to indicate an end data packet for the terminal device to forward the multicast service data to the second network node.

21. The method of claim 18, wherein sending second information to the first network node comprises:

sending a first multicast service data packet marked by a user plane to the first network node, wherein an extended subheader of the first multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used by the first network node to identify the terminal device, and the information of the multicast service packet marked by the third network node is used by the first network node to indicate an end packet for forwarding the multicast service data to the second network node by the terminal device.

22. The method of claim 18, further comprising:

and sending fifth information to the second network node, wherein the fifth information comprises the information of the multicast service data packet marked by the third network node.

23. The method of claim 22, wherein sending fifth information to the second network node comprises:

sending a third control plane control signaling to the second network node, the third control plane control signaling including any combination or one of: the information of the multicast service data packet marked by the third network node, the core network access and mobile management functional entity are the next generation protocol interface identifier AMF UE NGAP ID and the multicast broadcast service MBS session identifier distributed for the mobile terminal equipment; the information of the multicast service data packet marked by the third network node is used for the second network node to indicate an initial data packet of multicast service data caching for the terminal equipment.

24. The method of claim 22, wherein sending fifth information to the second network node comprises:

sending a second multicast service data packet marked by a user plane to the second network node, wherein an extended subheader of the second multicast service data packet comprises AMF UE NGAP ID and information of the multicast service data packet marked by the third network node; the AMF UE NGAP ID is used by the second network node to identify the terminal device, and the information of the multicast service packet marked by the third network node is used by the second network node to indicate an initial packet for performing multicast service data caching for the terminal device.

25. The method of claim 18, further comprising:

and sending multicast service data packets to the first network node and the second network node, wherein each multicast service data packet has a sequence number.

26. The method of claim 25, wherein the sequence number is located in a general packet radio service tunneling protocol-user GTP-U extension subheader or a protocol data unit Session Container PDU Session Container extension subheader; the serial number is NG-U SN or GTP-U SN.

27. A handover processing method applied to a first network node includes:

sending a switching request message to a second network node, where the switching request message is used to indicate that the second network node switches from the first network node to one of multicast service data packets received by a terminal device of the second network node for marking, and the switching request message includes a maximum sequence number of the multicast service data packet acquired by the first network node from a third network node;

28. The method according to claim 27, wherein the maximum sequence number of the multicast service packet acquired by the first network node is used by the second network node to determine the information of the multicast service packet marked by the second network node.

29. The method of claim 27, wherein the information of the multicast service data packet marked by the second network node is used for the first network node to indicate an end data packet of the multicast service data forwarding from the terminal device to the second network node.

30. The method according to claim 27, wherein the information of the multicast service data packet marked by the second network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

31. A handover processing method applied to a second network node includes:

acquiring a switching request message sent by a first network node, wherein the switching request message is used for indicating a data packet in multicast service data packets received by terminal equipment for switching the second network node from the first network node to the second network node to mark, and the switching request message comprises a maximum sequence number of the multicast service data packets acquired by the first network node from a third network node;

32. The method of claim 31, wherein the information of the multicast service data packet marked by the second network node is used for a start packet indication of multicast service data caching performed by the second network node for the terminal device.

33. The method according to claim 31, wherein the information of the multicast service data packet marked by the second network node is a sequence number, and the sequence number is a next generation-user sequence number NG-U SN or a general packet radio service tunneling protocol-user sequence number GTP-U SN.

34. A switching processing method is applied to a terminal device and comprises the following steps:

acquiring a switching instruction message sent by a first network node;

35. The method of claim 34, further comprising:

and sending broadcast receiving information to the second network node, wherein the broadcast receiving information comprises a sequence number of a multicast service data packet which is received by the terminal equipment firstly through broadcasting and a Packet Data Convergence Protocol (PDCP) sequence number.

36. A communication device, comprising: a processor;

the processor is configured to implement the handover handling method according to any of claims 1-9 when executing a computer program; or,

the processor is configured to implement the handover handling method according to any of claims 10-17 when executing a computer program; or,

the processor is configured to implement the handover handling method according to any of claims 18-26 when executing a computer program; or,

the processor is configured to implement the handover handling method according to any of claims 27-30 when executing a computer program; or,

the processor is configured to implement the handover handling method according to any of claims 31-33 when executing a computer program; or,

the processor is adapted to implement the handover handling method of claim 34 or 35 when executing a computer program.

37. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the handover processing method according to any one of claims 1 to 9; or implementing a handover handling method according to any of claims 10-17; or implementing a handover handling method according to any of claims 18-26; or implementing a handover handling method according to any of claims 27-30; or implementing a handover handling method according to any of claims 31-33; or to implement a handover handling method as claimed in claim 34 or 35.