Network switching method, apparatus, device, and storage medium

Abstract

The application provides a network switching method, device, equipment and storage medium. The method is applied to a first communication node and includes the following steps. A switching demand message is sent to a core network. The UE context reference information on the original side is carried in the switching demand message. A switching control message sent by the core network is received. The UE context keeping information on the original side is carried in the switching control message. The UE context keeping information on the original side is used to indicate that the source side network node does not release the resources used by the UE. The UE context keeping information on the original side is determined by the UE context reference information on the original side.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, in particular to a network switching method, device, equipment and storage medium. BACKGROUND

[0002] The target 5G base station after the user terminal (User Equipment, UE) switching can be the same 5G base station as the secondary base station (Second Node, SN) in the EN-DC network before the switching, and the UE can continue to use the original wireless resource. The secondary base station SN in the EN-DC network after the UE switching can be the same 5G base station as the 5G base station before the switching, and the UE can continue to use the original wireless resource. How to make the 5G base station before the UE switching know that it is the same base station before and after the switching and retain the wireless resource of the UE is a problem to be solved. SUMMARY

[0003] The present application provides a method, device, equipment and storage medium for network switching.

[0004] In a first aspect, the embodiments of the present application provide a network switching method, which is applied to a first communication node and includes the following steps.

[0005] sending a switching demand message to a core network, wherein the switching demand message carries UE context reference information on the original side;

[0006] receiving a switching control message sent by the core network, wherein the switching control message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct a source side network node not to release the resource used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side.

[0007] In a second aspect, the embodiments of the present application provide a network switching method, which is applied to a second communication node and includes the following steps.

[0008] receiving a switching request message sent by the core network, wherein the switching request message carries UE context reference information on the original side;

[0009] sending a switching request notification message to the core network, wherein the switching request notification message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct a source side network node not to release the resource used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side.

[0010] In a third aspect, the embodiments of the present application provide a network switching method, applied to a third communication node, comprising:

[0011] receiving a third message, wherein the third message carries wireless resource indication information;

[0012] reserving part or all of the wireless resources of the original cell according to the wireless resource indication information.

[0013] In a fourth aspect, the embodiments of the present application provide a network switching device, configured in a first communication node, comprising:

[0014] a first sending module, configured to send a switching demand message to a core network, wherein the switching demand message carries UE context reference information on the original side;

[0015] a first receiving module, configured to receive a switching control message sent by the core network, wherein the switching control message carries UE context keeping information on the original side, wherein the UE context keeping information on the original side is used to instruct a source side network node not to release resources used by the UE, and the UE context keeping information on the original side is determined by the UE context reference information on the original side.

[0016] In a fifth aspect, the embodiments of the present application provide a network switching device, configured in a second communication node, comprising:

[0017] a second receiving module, configured to receive a switching request message sent by the core network, wherein the switching request message carries UE context reference information on the original side;

[0018] a second sending module, configured to send a switching request notification message to the core network, wherein the switching request notification message carries UE context keeping information on the original side, wherein the UE context keeping information on the original side is used to instruct a source side network node not to release resources used by the UE, and the UE context keeping information on the original side is determined by the UE context reference information on the original side.

[0019] In a sixth aspect, the embodiments of the present application provide a network switching device, configured in a third communication node, comprising:

[0020] a third receiving module, configured to receive a third message, wherein the third message carries wireless resource indication information;

[0021] a reserving module, configured to reserve part or all of the wireless resources of the original cell according to the wireless resource indication information.

[0022] In a seventh aspect, the embodiments of the present application provide an apparatus, comprising:

[0023] one or more processors;

[0024] a memory for storing one or more programs;

[0025] When the one or more programs are executed by the one or more processors, the one or more processors implement any of the methods in the embodiments of the present application.

[0026] In an eighth aspect, the embodiments of the present application provide a storage medium, which stores a computer program, and the computer program is executed by a processor to implement any of the methods in the embodiments of the present application.

[0027] More details about the above embodiments and other aspects of the present application and implementation manners thereof are provided in the description of drawings, specific embodiments and claims. DETAILED DESCRIPTION

[0028] Figure 1 is a typical 5G network architecture schematic diagram;

[0029] Figure 2 is a schematic diagram of the EN-DC architecture in the prior art;

[0030] Figure 3 is a flowchart of a network switching method provided by the embodiments of the present application;

[0031] Figure 4 is a flowchart of a network switching method provided by the embodiments of the present application;

[0032] Figure 5 is a flowchart of a network switching method provided by the embodiments of the present application;

[0033] Figure 6 is a flowchart of the UE switching from the SA 5G network to the EN-DC network in the present application;

[0034] Figure 7 is a flowchart of the UE switching from the EN-DC network to the SA 5G network in the present application;

[0035] Figure 8 is a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call, provided by the present application;

[0036] Figure 9 is a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call, provided by the present application;

[0037] Figure 10A flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call is provided for the present application;

[0038] Figure 11 A flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call is provided for the present application;

[0039] Figure 12 A flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call is provided for the present application;

[0040] Figure 13 A flowchart of a method for network switching based on a measurement report of a current network by a terminal is provided for the present application;

[0041] Figure 14 A flowchart of a method for network switching based on a measurement report of a current network by a terminal is provided for the present application;

[0042] Figure 15 A flowchart of a method for network switching based on a measurement report of a current network by a terminal is provided for the present application;

[0043] Figure 16 A flowchart of a method for network switching based on a measurement report of a current network by a terminal is provided for the present application;

[0044] Figure 17 A structural schematic diagram of a network switching device provided by an embodiment of the present application is provided.

[0045] Figure 18 A structural schematic diagram of a network switching device provided by an embodiment of the present application is provided.

[0046] Figure 19 A structural schematic diagram of a network switching device provided by an embodiment of the present application is provided.

[0047] Figure 20 A structural schematic diagram of a device provided by an embodiment of the present application is provided. DETAILED DESCRIPTION

[0048] To make the objectives, technical solutions and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other as long as there is no conflict.

[0049] The steps shown in the flowcharts of the drawings can be performed in a computer system such as a set of computer-executable instructions. Also, while a logical sequence of steps is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order other than that shown.

[0050] A base station (NG-RAN node, gNB) of a 5G network can support large capacity traffic (e.g., MBB). Figure 1 is a typical 5G network architecture diagram. As shown in Figure 1 , the 5G network includes a 5G core network (5G Core, 5GC) and a 5G base station gNB. Among them, the 5GC contains network element nodes such as access mobility function nodes (Access Mobility Function, AMF), session management function nodes (Session Management Function, SMF), and user plane function nodes (User Plane Function, UPF). The 5G base station is also called: gNB, Next Generation Radio Access Network (NG-RAN) node. A completely new physical layer air interface design is adopted, and the air interface supports New Radio (NR), NR RAT mode base station, and related base station network element interfaces. The 5G base station is connected to the 5GC through the standardized NG interface (including NG-C control plane (signaling) connection and NG-U user plane (user data) connection), while the NG-RAN base station (gNB or ng-eNB) is connected to each other through the Xn interface (including Xn-C control plane connection and Xn-U user plane connection).

[0051] 5G can provide MBB services, but existing 5G networks may not support voice services (Voice service), that is, they do not support the Voice over New Radio (VoNR) function under 5G access. In this case, the mobile terminal (user equipment, UE) connected to the 5G network also called user equipment, needs to switch to the 4G (LTE) network to establish voice services, and the 4G network generally supports VoLTE function.

[0052] 4G network includes 4G core network, i.e. packet core network (Evolved Packet Core, EPC) and 4G radio access network (Long Term Evolution Radio Access Network, LTE RAN), wherein the EPC contains basic network element nodes such as mobility management entity node (Mobility Management Entity, MME), serving gateway node (Serving Gateway, SGW), PDN gateway node (PDN Gateway, PGW) and the like, and the 4G RAN includes evolved NodeB (eNB) and the interface between related base station network elements.

[0053] In order to simultaneously support voice service and MBB service of the mobile terminal, a network architecture of EN-DC is provided. Figure 2 is a schematic diagram of the EN-DC architecture in the prior art, as Figure 2 shown, one terminal is connected to one eNB (4G base station, LTE base station) as a master node (MN) and connected to one gNB (5G base station, NR base station) as a secondary node (SN) at the same time. This master node eNB is connected to the 4G core network EPC through the S1 interface and connected to the 5G base station through the X2 interface. And this 5G base station gNB can also be connected to the EPC through the S1-U interface, and can also be connected to other 5G base stations through the X2-U interface.

[0054] In the existing access network, the network mode of combining two base stations (such as one 4G base station and one 5G base station in the EN-DC architecture) in a tightly coupled manner to provide communication services for the UE is called dual connectivity (DC) network. As Figure 2 shown, the two base stations are divided into a master node (MN, also called a first network element) and a secondary node (SN, also called a second network element). The design of the dual connectivity network can improve the communication capacity of a session.

[0055] In the scenario of switching the UE from the SA 5G network to the EN-DC network. The UE is originally connected to the SA 5G network, and the UE is performing MBB service, at this time, voice service needs to be performed (such as: answering a voice call, or initiating a voice call), but the 5G network cannot support voice service, the UE needs to switch to the LTE network to establish VoLTE service, the UE needs to continue the original MBB service, so the UE switches to the EN-DC network, establishes VoLTE connection in the LTE RAN node, and establishes the original MBB service connection in the NG-RAN node.

[0056] In the scenario of UE switching from EN-DC network to SA 5G network. The UE is originally connected to the EN-DC network, S-MN (the original master node is the LTE eNB), S-SN (the original secondary node is the gNB, also known as: NG-RAN node), when the UE ends the VoLTE service (such as: hang up the phone) and continues the 5G service (such as wideband streaming media service, MBB service), the UE switches to the SA 5G network (stand alone NR).

[0057] For the above first scenario, when the secondary base station SN in the EN-DC network after the UE switches is the same as the SA 5G base station before the UE switches, a method is provided so that the UE can continue to use the wireless resources on the same 5G base station. Similar methods are also provided for the above second scenario. The target 5G base station after the UE switches can know that it is the same 5G base station as the original 5G base station before the UE switches, and the UE can continue to use the original wireless resources.

[0058] However, there is no method for the 5G base station before the UE switches to know this and retain the wireless resources of the UE. Due to this technical defect, the original base station before the UE switches releases the wireless resources of the UE after the UE switches successfully, so that the target 5G base station after the UE switches cannot continue to use the wireless resources of the UE.

[0059] To solve the above problems, the present application provides a method, device, equipment and storage medium for network switching, so that the target 5G base station after the UE switches can know that it is the same 5G base station as the original 5G base station before the UE switches, and the UE can continue to use the original wireless resources.

[0060] In one embodiment, the present application provides a network switching method, Figure 3 A flowchart of a network switching method provided by an embodiment of the present application. The method can be applied to the case that the UE continues to use the original wireless resources before and after network switching. The method can be executed by the network switching device provided by the present application, which can be realized by software and / or hardware. The method is applied to the first communication node.

[0061] As Figure 3 shown, the network switching method provided by the embodiment of the present application mainly includes steps S11 and S12.

[0062] S11, sending a switching demand message to the core network, wherein the UE context reference information on the original side is carried in the switching demand message;

[0063] S12, receiving a handover control message sent by the core network, wherein the handover control message carries UE context keeping information on the original side, wherein the UE context keeping information on the original side is used to instruct the source side network node not to release the resources used by the UE, and the UE context keeping information on the original side is determined by UE context reference information on the original side.

[0064] In the embodiment, the first communication node can be understood as a source side network node. Further, if the network handover is SA 5G network handover to EN-DC network, the first communication node can be understood as an NG-RAN node in the SA 5G network. If the network handover is EN-DC network handover to SA 5G network, the first communication node can be understood as a secondary node in the EN-DC network, and it needs to be noted that the secondary node in the EN-DC network is also a 5G base station.

[0065] In an exemplary embodiment, in the case of network handover from SA 5G network to EN-DC network, before receiving the handover control message sent by the core network, the method further comprises:

[0066] receiving a secondary node addition request message sent by the second communication node, wherein the secondary node addition request message carries the UE context reference information on the original side;

[0067] sending a secondary node addition notification message to the second communication node, wherein the secondary node addition notification message is used to inform the target node that the UE establishes dual connectivity under the EN-DC network.

[0068] In an exemplary embodiment, the UE context reference information on the original side includes a source 5G radio access network node (Source NG-RAN node) and / or an access network terminal interface application protocol identifier (RAN UE NGAP ID).

[0069] In an exemplary embodiment, the secondary node addition request message carrying the UE context reference information on the original side is sent by the core network to the second communication node.

[0070] In an exemplary embodiment, in the case of network handover from SA 5G network to EN-DC network, the first communication node is a 5G base station in the SA 5G network, and the second communication node is an LTE eNB in the EN-DC network.

[0071] In an exemplary embodiment, in the case of network handover from EN-DC network to SA 5G network, after receiving the handover control message sent by the core network, the method further comprises:

[0072] sending a secondary node addition request message to the second communication node, wherein the secondary node addition request message carries the UE context reference information on the original side;

[0073] receiving a secondary node addition notification message sent by the second communication node, wherein the secondary node addition notification message is used to notify the UE to establish dual connectivity under the EN-DC network.

[0074] In one exemplary embodiment, in the case of determining to reserve the use of the resource, a third message is sent to the third communication node, wherein the third message carries radio resource indication information.

[0075] In one exemplary embodiment, in the case of network switching being SA 5G network switching to EN-DC network, after sending the UE release complete message to the core network, the method further comprises:

[0076] sending a UE release message to the second communication node, wherein the UE release message is used to instruct the second communication node to release the signaling connection with the node.

[0077] In one exemplary embodiment, the UE context reference information on the original side includes an SN UE X2AP ID information unit to identify.

[0078] In one exemplary embodiment, in the case of network switching being EN-DC network switching to SA 5G network, the first communication node is an LTE eNB in the EN-DC network, and the secondary node is a 5G base station in the 5G network.

[0079] In one embodiment, the present application provides a network switching method, Figure 4 A flowchart of a network switching method provided by an embodiment of the present application. The method can be applied to the case where the UE continues to use the original wireless resource before and after network switching. The method can be executed by a network switching device provided by the present application, which can be realized by software and / or hardware. The method is applied to the second communication node.

[0080] As Figure 4 shown, the network switching method provided by the embodiment of the present application mainly includes steps S21 and S22.

[0081] S21, receiving a handover request message sent by the core network, wherein the handover request message carries UE context reference information on the original side;

[0082] S22, sending a handover request notification message to the core network, wherein the handover request notification message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct the source side network node not to release resources used by the UE, and the UE context retention information on the original side is determined by UE context reference information on the original side.

[0083] In the embodiment, in the case that the network switching is EN-DC network switching to SA 5G network, the first communication node is an LTE eNB in the EN-DC network, and the secondary node is a 5G base station in the 5G network. In the case that the network switching is SA 5G network switching to EN-DC network, the first communication node is a 5G base station in the SA 5G network, and the second communication node is an LTE eNB in the EN-DC network.

[0084] In one exemplary embodiment, in the case that the network switching is SA 5G network switching to EN-DC network, after receiving the handover request message sent by the core network, the method further comprises:

[0085] sending a secondary node addition request message to the first communication node, wherein the secondary node addition request message carries the UE context reference information on the original side;

[0086] receiving a secondary node addition notification message sent by the first communication node, wherein the secondary node addition notification message is used to inform the target node that the UE establishes dual connectivity under the EN-DC network.

[0087] In one exemplary embodiment, in the case that the network switching is EN-DC network switching to SA 5G network, the method further comprises:

[0088] receiving a secondary node addition request message sent by the first communication node, wherein the secondary node addition request message carries the UE context reference information on the original side;

[0089] sending a secondary node addition notification message to the first communication node, wherein the secondary node addition notification message is used to inform the UE to establish dual connectivity under the EN-DC network.

[0090] In one exemplary embodiment, in the case that the network switching is SA 5G network switching to EN-DC network, the method further comprises:

[0091] receiving a UE release message sent by the first communication node, wherein the UE release message is used to instruct the node to release the signaling connection with the first communication node.

[0092] In one embodiment, the present application provides a network switching method,Figure 5 A flowchart of a network switching method provided by an embodiment of the present application. The method can be applied to the case where the UE continues to use the original wireless resources before and after network switching. The method can be executed by a network switching device provided by the present application, which can be implemented by software and / or hardware, and the method is applied in a third communication node.

[0093] As shown in Figure 5 The network switching method provided by the embodiment of the present application mainly includes steps S31 and S32.

[0094] S31, receiving a third message, wherein the third message carries wireless resource indication information;

[0095] S32, reserving part or all of the wireless resources of the original cell according to the wireless resource indication information.

[0096] In an exemplary embodiment, the third message is sent by the first communication node.

[0097] In an exemplary embodiment, the third message is an RRC reconfiguration message, or the third message is a radio control message.

[0098] In an exemplary embodiment, the wireless resource indication information includes: original cell reservation indication information, or secondary cell information, or reserved PDU session information, or NAS resource reservation indication, or suspension indication, or QoS flow reservation information.

[0099] In an exemplary embodiment, the QoS flow reservation information is used to indicate that the QoS flow or QoS flow information is reserved after network switching.

[0100] In an exemplary embodiment, the original cell reservation indication information is used to indicate that part or all of the wireless resources of the original cell are reserved after network switching.

[0101] In an exemplary embodiment, based on the relationship between the secondary cell information and the original cell information, part or all of the wireless resources of the original cell are reserved after network switching.

[0102] In an exemplary embodiment, the secondary cell information is single secondary cell information or a secondary cell list.

[0103] In an exemplary embodiment, the NAS resource reservation indication is used to indicate that part or all of the NAS resources of the original cell are reserved after network switching, wherein the part or all of the NAS resources include one or more of the following: the registration state of the UE, TAU information, integrity and encryption information.

[0104] In an exemplary embodiment, the suspension indication is configured to indicate that part or all of the radio resources of the original cell are to be retained after the network switching.

[0105] In an exemplary embodiment, the part or all of the radio resources include part or all of the radio connections, wherein the radio connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

[0106] In an exemplary embodiment, the part or all of the radio resources include part or all of the radio configurations, wherein the radio configurations include at least one of the following: L1 physical layer configuration, MAC layer configuration, RLC layer configuration, RRC layer configuration, PDCP layer configuration, NAS layer configuration.

[0107] In an exemplary embodiment, the PDU session information to be retained is configured to indicate that the PDU session is to be retained after the network switching.

[0108] In an exemplary embodiment, the PDU session information to be retained includes PDU session retention indication information, or a list of PDU session information to be retained, wherein the list of PDU session information includes one or more PDU session information.

[0109] In an exemplary embodiment, the part or all of the radio resources to be retained include:

[0110] Continuing to use the downlink bandwidth part (BWP);

[0111] Receiving downlink data transmitted by the PDSCH according to RIV indication information in the downlink control information (DCI).

[0112] In an exemplary embodiment, if the following condition is met then

[0113] If the following condition is not met then

[0114] wherein L CRBS is the length of the contiguous RBs, and N( DL RB ) is the number of RBs of the downlink bandwidth.

[0115] In an exemplary embodiment, the part or all of the radio resources to be retained include:

[0116] Retaining the C-RNTI of the UE, wherein the C-RNTI of the UE is used for DCI reception information.

[0117] In an example embodiment, the reserving part or all of the radio resources comprises:

[0118] reserving a resource allocation manner of a PUCCH (Physical Uplink Control Channel);

[0119] allocating a PUCCH resource set.

[0120] In an example embodiment, the reserving part or all of the radio resources comprises:

[0121] reserving one or more data radio bearers (DRBs);

[0122] reserving one or more signaling radio bearers (SRBs);

[0123] modifying one of the SRB1 or SRB2 to SRB3.

[0124] In an example embodiment, the reserving part or all of the radio resources comprises:

[0125] continuing to use the original PDU session for data transmission;

[0126] or, after the first communication node initiates the PDU session, reestablishing the data connection.

[0127] In an example embodiment, the reserving part or all of the radio resources comprises:

[0128] using the security context before the handover.

[0129] In an example embodiment, the reserving part or all of the radio resources comprises: reserving a DCCH (Dedicated Control Channel).

[0130] In an example embodiment, the reserving the DCCH comprises:

[0131] continuing to send and receive data according to the DCCH.

[0132] In an example embodiment, the reserving part or all of the radio resources comprises: reserving part or all of QoS (Quality of Service) flows or QoS flow information.

[0133] In an example embodiment, the reserving the QoS flow or QoS flow information comprises:

[0134] continuing to use the QoS flow and / or QoS flow information for user plane data transmission and / or reception.

[0135] In an application embodiment, the present embodiment provides a solution for the defects of the first scenario (UE switching from SA 5G network to EN-DC network).

[0136] The UE is originally connected to a SA 5G network, and the UE is conducting MBB service, at this time, the UE needs to conduct voice service (such as: answering a voice call, or initiating a voice call), but the SA 5G network cannot support voice service, the UE needs to switch to an LTE network to establish VoLTE service (Voice over LTE), the UE needs to continue the original MBB service, so the UE switches to an EN-DC network, establishes a VoLTE connection at an LTE RAN base station, and establishes an original MBB service connection at an NG-RAN base station.

[0137] Figure 6 is a flowchart of the UE switching from a SA 5G network to an EN-DC network in this application, as shown in Figure 6 The UE is connected to a 5G base station (S-gNB) of the original SA 5G network, also referred to as an original node (S-node), in the target EN-DC network to which the UE switches, the T-MN (Target Master node) is an LTE eNB, also referred to as MeNB (Master eNB), and the T-SN (Target Secondary node) is a 5G base station, that is, an NG-RAN node. When the target NG-RAN node is the original NR node, the following process is performed:

[0138] Step 601: The original node S-node (S-gNB) sends a handover required message to the core network (CN). The handover required message includes UE context reference at Source information at the original side, wherein the information is contained in the existing information element (IE) Source To Target transparent Container in the message. Figure 2

[0139] ​The UE context reference at Source uniquely identifies a UE association over an NG interface and the source NG-RAN node. In the first scenario, because the source node is a gNB and the gNB is connected to the 5GC, the UE context reference at Source can be jointly identified by the combination of the Source NG-RAN node (globally unique identification) and the RAN UE NGAP ID. That is: the UE context reference at Source includes any one or more combinations of the Source NG-RAN node or the RAN UE NGAP ID.

[0140] Step 602: The T-MN (Target master NG-RAN node) receives a handover request message from the core network, wherein the handover control message includes the UE context reference at Source information, which is contained in the Source To Target transparent Container information element already in the message.

[0141] The UE context reference at Source information carried in the Source To Target transparent Container is directly sent to the T-MN by the CN after receiving it from the S-node.

[0142] Step 603: The T-MN sends a secondary node addition request (SN addition request) message to the T-SN. When the T-MN determines that the T-SN is the same node as the S-node and decides to continue using the wireless resources of the UE on the S-node, the UE context reference at Source information or the RAN UE NGAP ID information is included in the secondary node addition request message. The T-SN finds the UE context of the UE on the original node according to this information, and continues to use the resources of the UE on the original side.

[0143] Step 604: The T-SN sends a secondary node addition request acknowledge (SN addition request acknowledge) message to the T-MN, informing the T-MN that the UE has established dual connectivity under the EN-DC network.

[0144] Step 605: The T-MN sends a handover request acknowledge (Handover request Acknowledge) message to the core network. When the T-MN learns through steps 603 and 604 that the UE has successfully established the T-SN and the T-SN continues to use the resources of the UE on the S-node, the handover request acknowledge message includes UE context at source kept information, which is contained in the Target to Source transparent container.

[0145] The UE context at source kept information means that the UE resources on the original node will continue to be used on the target node after the handover, and the target node uses this information to inform the original node not to delete the UE resources on the original node.

[0146] Step 606: The S-node receives a handover command (Handover command) message from the core network, wherein the handover command message includes UE context at source kept information, which is contained in the Target to Source transparent container.

[0147] The UE context reference at Source information is carried in the Target to Source transparent container, and after the CN receives it from the T-MN, it is directly sent to the S-node.

[0148] Step 607: The UE is synchronized to the target base station over the air interface, that is, the UE establishes dual connectivity with the T-MN and the T-SN, establishes VoLTE services on the T-MN, and continues to complete MBB services on the T-SN.

[0149] Step 608: The T-MN sends a handover notification (Handover notify) message to the core network, which is used to inform the core network that the UE has been handed over to the target base station.

[0150] Step 609: The S-node receives a UE release command message from the core network. The S-node releases its signaling connection with the CN (i.e., releases the NG interface), but does not release the resources of the UE. This is because the S-node knows that the resources of the UE at the original 5G base station are to be continued to be used by the target base station, as indicated in the message received by the S-node in step 606.

[0151] Step 6010: The S-node sends a UE release complete message to the core network.

[0152] In the above application embodiment, from the perspective of the original node (S-node), the original node mainly performs the following operations.

[0153] Through the core network, the S-node switches the UE to the target node, and the S-node sends and receives the following messages to and from the core network.

[0154] Step 1: Send a Handover required message, which includes UE context reference at Source information; the information uniquely identifies the UE resources of the UE at the original node.

[0155] Step 2: Receive a Hanover command message, which includes UE context at source kept information. The information informs the original node not to release the UE resources of the UE at the original node.

[0156] Step 3: Receive a UE release comman message, and the original node releases its connection with the core network, but does not release the UE resources of the UE at the original node.

[0157] Step 4: Send a UE release comple message, informing the core network that the connection between the original node and the core network has been released.

[0158] In the above application embodiment, from the perspective of the target node (T-MN), the target node mainly performs the following operations.

[0159] The target master node (T-MN) sends and receives the following messages to and from the core network, and sends and receives the following messages to and from the target secondary node.

[0160] Step 1: Receiving Handover request message from core network, including UE context Reference at Source information;

[0161] Step 2 / 3: According to UE context Reference at Source information, T-SN selected by T-MN is S-node, and EN-DC dual connectivity is established for the UE through step 2 / 3.

[0162] Step 4: Sending Handover request acknowledge message to core network, including UE context at Source kept information, indicating that the UE resource at the original node needs to be reserved and continued to be used by the target node.

[0163] Step 5: After the UE is synchronized to the target node, Handover notify message is sent to the core network, notifying the core network that the UE has been switched to the target node.

[0164] In one application embodiment, the present embodiment provides a solution for the defects of the second scenario (UE switching from EN-DC network to SA 5G network).

[0165] The UE is originally connected to the EN-DC network, for example, the UE is making a phone call while performing MBB service. The S-MN (original master node is LTE eNB) and the S-SN (original second node is gNB, also known as: NG-RAN node), when the UE ends the VoLTE service (such as: hanging up the phone) and continues the 5G service (such as wideband streaming media service, MBB service), the UE switches from the EN-DC network to the SA 5G network (stand alone NR).

[0166] Figure 7 is the flowchart of the UE switching from the EN-DC network to the SA 5G network in the present application, as shown in Figure 7 When the original S-SN node and the T-MN node are the same NG-RAN node, the following process is performed:

[0167] Step 71: S-MN (original master node, such as MeNB node) sends a handover required message to the core network (CN), and the message includes a UE context reference at Source information element (IE) contained in a Source To Target transparent Container.

[0168] In the second scenario, because the original secondary node refers to an S-SN in an EN-DC network, and the S-SN is connected to the S-MN, the UE context reference at Source can be identified by an SN UE X2AP ID information element.

[0169] Step 72: The T-node (target node, Target NG-RAN node) receives a handover request message from the core network, and the handover request message includes UE context reference at Source information contained in a Source To Target transparent Container.

[0170] Step 73: The T-node sends a handover request acknowledge message, and the message includes UE context at Source kept information. When the T-node determines that it is the same NG-RAN node as the S-SN and decides to continue to use the UE resource on the S-SN, the message includes the indication information contained in a Target to Source transparent container.

[0171] Step 74: The S-MN receives a handover command message sent by the core network, and the message includes UE context at Source kept indication information.

[0172] Step 75: The S-MN sends a secondary node release request (SN release request) message to the S-SN, and the message includes UE context at Source kept indication information.

[0173] Step 76: S-SN sends a secondary node release request acknowledge message to S-MN.

[0174] Step 77: UE synchronizes to the target base station over the air, i.e. UE establishes connection with T-node, and UE continues MBB service with SA 5G base station.

[0175] Step 78: T-node sends a handover notify message to the core network, notifying the core network that the UE has been handed over to the target base station (T-node).

[0176] Step 79: S-MN receives a UE release command message from the core network. S-MN releases its connection with the CN (i.e. releases S1 interface).

[0177] Step 710: S-MN sends a UE release complete message to the core network.

[0178] Step 711: S-MN sends a UE release message to S-SN. After receiving the message, S-SN releases the signaling connection with M-SN, but keeps the resources of the UE in S-SN, so that T-MN can continue to use.

[0179] In the above application embodiment, from the perspective of the original node (S-MN), the original node mainly performs the following operations.

[0180] The original master node sends and receives the following messages to and from the core network; sends and receives the following messages to and from the original secondary node.

[0181] Step 1: sends a Handover required message to the core network, including UE context reference at Source information in the message; the information uniquely identifies the UE resources of the UE in the original secondary node.

[0182] Step 2: receives a Hanover command message from the core network, including UE context at source kept information in the message. The information notifies the original secondary node (S-SN) not to release the UE resources of the UE in the original secondary node.

[0183] Step 3: Send SN release request message to S-SN, including UE context at source kept information, to inform the source secondary node (S-SN) not to release the UE resource at the source secondary node.

[0184] Step 4: Receive SN release request acknowledge message from S-SN, and know that S-SN releases the X2 connection with it.

[0185] In the above application embodiment, from the perspective of the target node (T-node), the target node mainly performs the following operations.

[0186] Through the core network, the T-node sends and receives the following messages to and from the core network.

[0187] Step 1: Receive Handover request message, including UE context reference at Source information;

[0188] Step 2: Send Handove request acknowledge message, including UE context at Source kept information, when the T-node judges that it is the same NG-RAN node as the S-SN and decides to continue to use the UE resource on the S-SN.

[0189] Step 3: The UE is synchronized to the target base station on the air interface, that is, the UE establishes a connection with the T-node, and the UE continues to perform MBB service on the SA 5G base station.

[0190] Step 4: The T-node sends a Handover notify message to the core network, informing the core network that the UE has been handed over to the target base station (T-node).

[0191] In one application embodiment, Figure 8 A flowchart of a method for switching between 4G and 5G, and between 5G SA / NSA modes when a terminal initiates a voice call is provided.

[0192] This embodiment is the operation between the terminal and the target RAN node in the above embodiment and the original network RAN node; this embodiment involves three network nodes, network node 1 is the UE; network node 2 is the network node NR g-NB currently camped by the UE; network node 3 is the E-UTRA e-NB of the target network RAN network node of the UE.

[0193] S801, the UE in RRC connected state initiates IMS voice call service to the original network RAN node GNB.

[0194] S802, after the CN discovers that the current 5GS does not support IMS voice service, the GNB sends a MobilityFromNRCommand message from NR to inform the UE to switch to an EN-DC network; the MobilityFromNRCommand message contains auxiliary cell or cell group information (NR).

[0195] S803, the terminal initiates a handover to E-UTRA according to the MobilityFromNRCommand. If the terminal finds that the auxiliary cell or cell group information is consistent with the cell or cell group information of the original network node GNB; after completing the handover to the E-UTRA cell network node ENB; part or all of the wireless connection, or part or all of the wireless configuration, or part or all of the PDU SESSION with the original network node NGB is retained.

[0196] S804, the ENDC network transmits data through the retained part of the wireless connection or wireless configuration or the retained part or all of the PDU SESSION.

[0197] Wherein, after receiving the MobilityFromNRCommand message carrying 0 to multiple auxiliary cells or cell group information, if one of the cell or cell group information is consistent with the cell information or cell group information of the original cell or uses the same network node GNB; the UE does not initiate a request for wireless configuration or wireless connection establishment with the network node GNB of the auxiliary cell or cell group.

[0198] Wherein, after receiving the MobilityFromNRCommand message, if one of the cell or cell group information is consistent with the cell information or cell group information of the original cell or uses the same network node GNB; the UE retains part or all of the wireless configuration or part or all of the wireless connection with the original cell S-MN network node GNB.

[0199] Wherein, after receiving the primary cell or cell group MobilityFromNRCommand message, if one of the cell or cell group information is consistent with the cell information or cell group information of the original cell or uses the same network node GNB; the UE retains part or all of the wireless resources with the original cell S-MN network node GNB.

[0200] The partial or full connection includes: RRC connection, partial or full SRB, and partial or full DRB.

[0201] The partial or full radio resource includes: L1 physical layer resource, MAC resource, SRB, DRB, PDCP entity, and SDAP entity.

[0202] The radio configuration includes: partial or full L1 physical layer configuration, partial or full MAC layer configuration, partial or full RLC layer configuration, partial or full RRC layer configuration, partial or full PDCP layer configuration, and partial or full NAS configuration.

[0203] The step S801 of initiating the voice call service includes the following processing.

[0204] The terminal sends an invite message to the IMS server via the GNB, the IMS server sends a 100 trying message to the UE via the GNB, the UE sends a 183 Session Progress to the IMS server via the GNB, the IMS server sends a PRACK message to the UE, and the UE sends a 200 OK message to the IMS server.

[0205] The reserved partial or full physical layer configuration includes: the UE continues to use the downlink BWP and receives downlink data transmitted by the PDSCH according to the RIV indication information in the DCI.

[0206] Further, the RIV value is:

[0207] If the following condition is met: then

[0208] If the following condition is not met: then The L CRBS is the length of the continuous RB, and N DL RB is the number of downlink RBs.

[0209] The reserved partial or full physical layer configuration includes: the C-RNTI of the UE is reserved for receiving DCI information.

[0210] The reserved partial or full physical layer configuration includes: the resource allocation mode of the uplink control channel PUCCH is reserved, and / or the allocated PUCCH resource set is reserved.

[0211] The reserved partial or full radio connection includes: one or more DRBs (data radio bearers) are reserved.

[0212] The reserving part or all of the wireless connection includes reserving one or more SRBs (signaling radio bearers)

[0213] The reserving part or all of the wireless connection includes modifying one of SRB1 or SRB2 to SRB3.

[0214] The reserving part or all of the NAS configuration includes reserving the registration status of the UE, and or TAU information, and / or integrity and encryption information.

[0215] After the UE completes the handover, the original PDU SESSION is continued to be used for data transmission; or the E-sgNB initiates the reconstruction of the PDU connection to recover the data connection.

[0216] After the UE completes the handover, the original PDU SESSION is continued to be used for data transmission; or the E-sgNB initiates the reconstruction of the PDU connection to recover the data connection.

[0217] In an application embodiment, Figure 9 A flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call is provided. The embodiment involves three network nodes, network node 1 is a UE; network node 2 is the current network NR g-NB in which the UE resides; and network node 3 is the target network E-UTRA e-NB of the UE.

[0218] S901, the UE in RRC connected state initiates IMS voice call service to the GNB

[0219] S902, after the CN discovers that the current 5GS does not support IMS voice service, the ENB sends a MobilityFromNRCommand message to inform the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains indication information for reserving the original NR cell.

[0220] S903, the terminal initiates handover to E-UTRA according to the MobilityFromNRCommand; after completing the cell handover to the E-UTRA, part or all of the original NR cell wireless connection or wireless configuration is reserved or part or all of the PDU SESSION is reserved

[0221] The part or all of the connection includes RRC connection, and related SRB, DRB.

[0222] The partial or full radio resource includes: L1 physical layer resource, MAC resource, SRB, DRB, PDCP entity, SDAP entity

[0223] The radio configuration includes: partial or full L1 physical layer configuration, partial or full MAC layer configuration, partial or full RLC layer configuration, partial or full RRC layer configuration; partial or full PDCP layer configuration, partial or full NAS configuration.

[0224] S904, the ENDC network transmits data through the reserved partial or full radio connection or radio configuration or PDU SESSION.

[0225] In one application embodiment, Figure 10 A flowchart of a method for terminal switching between 4G and 5G, and between 5G SA / NSA modes is provided. The embodiment involves three network nodes, network node 1 is a UE; network node 2 is the current network NR g-NB in which the UE resides; and network node 3 is the target network E-UTRA e-NB for the UE switching.

[0226] S1001, the UE in RRC connected state sends a measurement report to the GNB.

[0227] S1002, the GNB sends a MobilityFromNRCommand message to inform the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains T-MN information (M-ENB) of E-UTRA and indication information of reserving the original NR cell.

[0228] S1003, the terminal initiates switching to E-UTRA according to the MobilityFromNRCommand; after completing the cell switching to the E-UTRA; partial or full radio bearers of the original NR cell are reserved.

[0229] The reserved partial or full radio bearers of the original cell include: reserving partial or full physical layer resource configuration, reserving partial or full SDAP or PDCP entity in SRB1, SRB2 and DRB; reserving all or part of PDU session in the NR network; initiating connection reconstruction of the corresponding PDN CONNECTION for all or part of PDU SESSION in the EN-DC network.

[0230] S1004, the ENB schedules the UE to transmit control signaling or data through the reserved part of SRB or DRB or PDU SESSION according to network requirements.

[0231] In one application embodiment, Figure 11 A flowchart of a terminal handover method between 4G and 5G, and 5G SA / NSA modes is provided. The embodiment involves three network nodes, network node 1 is a UE; network node 2 is the current network NR g-NB in which the UE resides; and network node 3 is the target network E-UTRA e-NB of the UE.

[0232] S1101, the UE in RRC connected state sends a measurement report to the GNB

[0233] S1102, the ENB sends a MobilityFromNRCommand message to inform the UE to hand over to an EN-DC network; the MobilityFromNRCommand message contains T-MN information (M-ENB) of E-UTRA and T-SN information (GNB)

[0234] S1103, the terminal initiates handover to E-UTRA according to the MobilityFromNRCommand; after completing the cell handover to the E-UTRA; if the T-SN is the original NR cell; reserve part or all of the original NR cell radio bearer. The reserved part or all of the original cell radio bearer includes: reserve the original part or all of the physical layer resource configuration, or reserve part or all of the SDAP or PDCP entity in SRB1, SRB2 and DRB; reserve all or part of the PDU session in the NR network; initiate the reestablishment of the corresponding PDN CONNECTION in the EN-DC network for all or part of the PDU SESSION.

[0235] S1104, the ENB schedules the UE to transmit control signaling or data through the reserved part of SRB or DRB or PDU SESSION according to network requirements.

[0236] In one application embodiment, Figure 12 A flowchart of a terminal voice call being called between 4G and 5G, and 5G SA / NSA modes is provided. The embodiment involves three network nodes, network node 1 is a UE; network node 2 is the current network NR g-NB in which the UE resides; and network node 3 is the target network E-UTRA e-NB of the UE.

[0237] S1201, CN attempts to initiate IMS voice call service for the UE in the connected state, discovers that 5GS does not support IMS VOICE service, and sends a MobilityFromNRCommand message to notify the processing of the connected UE to switch to an EN-DC network; the MobilityFromNRCommand message contains T-MN information (M-ENB) of E-UTRA and T-SN information.

[0238] S1202, the terminal initiates switching to E-UTRA according to the MobilityFromNRCommand; and sends an RRCRECONFIGURATION message to the ENB.

[0239] If the terminal finds that the T-SN information belongs to a NR cell; after completing the cell switching to the E-UTRA; reserve part or all of the original NR cell's radio resources. Reserving part or all of the original cell's radio resources includes one of the following: reserving the original part or all of the physical layer (L1) resource configuration, reserving part or all of the SDAP entity or PDCP entity in SRB1, SRB2, and DRB; reserving all or part of the PDU session in the NR network; for all or part of the PDU SESSION, do not initiate connection reestablishment of the corresponding PDN CONNECTION in the EN-DC network

[0240] S1203, the EN-DC network transmits control signaling or data through the reserved part of the SRB or DRB or PDU SESSION.

[0241] In one application embodiment, Figure 13 A flowchart of a terminal network switching method based on current network measurement report is provided for the present application, the UE is in a connected state connected to an EN-DC 5G network, the terminal is conducting EMMB service with the NR node GNB, and the network side discovers that the UE needs to switch to the MN cell according to the current network to measurement report; in order to ensure the continuity of EMMB service, especially the continuity of PDU SESSION data; the specific switching is as follows:

[0242] S1301, the ENB sends an RRCConnectionReconfiguration message to notify the UE to switch to another EN-DC network; wherein the RRCConnectionReconfiguration message contains a primary cell or cell group and 0 to multiple secondary cells or cell groups.

[0243] S1302, the UE receives the RRCConnectionReconfiguration initiates the handover to the target EN-DC cell indicated in the RRCConnectionReconfiguration, and sends an RRCConnectionReconfigurationComplete message to the target cell E-NB to complete the handover of the NR cell to the EN-DC cell. The UE determines whether to retain all or part of the current UE and the original cell (S-MN, GNB) PDU SESSION according to the secondary cell or cell group in the RRCConnectionReconfiguration. If the primary cell or cell group and 0 to multiple secondary cells or cell groups are consistent with the original cell or cell group, the UE retains part or all of the current UE and the original cell (S-MN, GNB) PDU SESSION.

[0244] Wherein, after the handover, the UE retains the PDU SESSION with the original cell S-MN; the UE does not initiate a new PDU SESSION establishment request based on the PDU SESSION ID and / or IP address and / or APN information; and a new PDU SESSION is established.

[0245] The UE receives and / or transmits data through the retained part or all PDU sessions.

[0246] In one application embodiment, Figure 14 A flowchart of a terminal network switching method based on current network measurement report is provided. The UE is originally connected to an SA 5G network, and is performing MBB service. At this time, voice service needs to be performed (such as answering a voice call or initiating a voice call), but the 5G network cannot support voice service. The UE needs to be switched to an LTE network to establish a VoLTE service (LTE-based voice). The UE needs to continue the original MBB service, so the UE is switched to an EN-DC network, a VoLTE connection is established in an LTE RAN node, and the original MBB service connection is established in an NG-RAN node.

[0247] UE connects to the 5G base station (S-gNB) of the original SA 5G network, also known as the original node (S-node), and switches to the target EN-DC network, and the T-MN (Target Master node) is the LTE eNB, also known as MeNB (Master eNB), and the T-SN (Target Secondary node) is the 5G base station, that is, the NG-RAN node. When the target NG-RAN node is the original NR node, the specific switching is as follows:

[0248] S1401, the GNB sends the MobilityFromNRCommand message to inform the UE to switch to the EN-DC network; wherein the MobilityFromNRCommand message contains an indication of retaining the original cell (i.e. the original NR cell);

[0249] S1402, the UE receives the MobilityFromNRCommand message and initiates the switching to the target EN-DC cell, and sends the RRCConnectionReconfigurationComplete message to the target cell E-NB to complete the switching of the NR cell to the EN-DC cell. The UE decides whether to retain all or part of the PDU SESSION of the current UE and the original cell (S-MN, GNB) according to the indication of retaining the original cell in the MobilityFromNRCommand message. If the indication information is to retain the original cell, the UE retains part or all of the PDU SESSION of the current UE and the original cell (S-MN, GNB) or the original cell (S-MN, GNB).

[0250] S1403, the EN-DC network continues to communicate through the retained PDU SESSION.

[0251] Wherein, after the UE receives the MobilityFromNRCommand message carrying the T-MN and the indication information of retaining the original cell, if the indication information is to retain the original cell, the UE does not initiate the re-establishment for the PDU SESSION of the retained original cell.

[0252] Wherein, after the UE receives the MobilityFromNRCommand message carrying the T-MN and the indication information of retaining the original cell, if the indication information is to retain the original cell, the UE does not initiate the re-establishment for the PDU SESSION of the retained original cell.

[0253] In one application embodiment, Figure 15To provide a flowchart of a terminal network switching method based on current network measurement report, the UE is connected to an EN-DC 5G network in a connected state, the terminal is conducting EMMB business with the NR node GNB, and the network side discovers that the UE needs to switch to an MN cell according to the current network to measurement report network

[0254] The specific switching is as follows:

[0255] S1501, the ENB sends an RRCConnectionReconfiguration message to inform the UE to switch to another EN-DC network; wherein the RRCConnectionReconfiguration message contains secondary cell or cell group reservation indication information.

[0256] S1502, the UE receives the RRCConnectionReconfiguration and initiates switching to the target EN-DC cell, sends an RRCConnectionReconfigurationComplete message to the target cell E-NB to complete the switching of the NR cell to the EN-DC cell. The UE decides whether to reserve the current UE and the original secondary cell or cell group wireless configuration or wireless connection according to the secondary cell or cell group reservation indication information in the RRCConnectionReconfiguration. If the secondary cell is indicated to be reserved, the UE reserves part or all of the wireless configuration or wireless connection of the UE and the original secondary cell or cell group.

[0257] S1503, the EN-DC network communicates with the UE through the T-MN and part or all of the wireless configuration or wireless connection reserved by the original secondary cell or cell group.

[0258] Wherein, after receiving the RRCConnectionReconfiguration message carrying the T-MN secondary cell reservation indication information, if the indication information indicates to reserve the secondary cell, the UE does not initiate the update or re-establishment of the wireless configuration or wireless connection with the original secondary cell or cell group consistent with or using the same network node secondary cell or cell lease.

[0259] Wherein, after receiving the RRCConnectionReconfiguration message carrying the T-MN secondary cell reservation indication information, if the indication information indicates to reserve the secondary cell, the UE reserves part or all of the wireless resources of the original secondary cell or cell group.

[0260] wherein the partial or full radio resource comprises: L1 physical layer resource, MAC resource, SRB, DRB, PDCP entity, SDAP entity.

[0261] wherein the radio configuration comprises: partial or full L1 physical layer configuration, partial or full MAC layer configuration, partial or full RLC layer configuration, partial or full RRC layer configuration; partial or full PDCP layer configuration, partial or full NAS configuration.

[0262] In one application embodiment, Figure 16 A flowchart of a network switching method based on a current network measurement report of a terminal is provided in the present application. The UE is originally connected to a SA 5G network, and the UE is performing MBB service. At this time, voice service needs to be performed (such as answering a voice call or initiating a voice call), but the 5G network cannot support voice service. The UE needs to switch to an LTE network to establish VoLTE service (LTE-based voice). The UE needs to continue the original MBB service, so the UE switches to an EN-DC network, establishes a VoLTE connection at an LTE RAN node, and establishes a connection for the original MBB service at an NG-RAN node.

[0263] In an NR network, a UE needs to establish a PDU session with the network for data communication. In order to maintain data continuity during network switching, the UE generally releases the current PDU session after network switching and establishes a new PDU session or SDP connection corresponding to the target cell. At this time, the reconstruction of the PDU session or the SDP connection will temporarily terminate the data transmission of the terminal. In order to ensure higher data continuity, when the target cell T-SN is consistent with the RAN node or cell of the current cell S-MN, the flow is as follows:

[0264] S1601 The GNB sends a MobilityFromNRCommand message to notify the UE to switch to an EN-DC network. The MobilityFromNRCommand message contains a PDU session reservation indication.

[0265] S1602 UE receives the MobilityFromNRCommand message and initiates the handover to the target EN-DC cell, and sends an RRCConnectionReconfigurationComplete message to the target cell E-NB. The UE determines whether to retain all or part of the PDU SESSION of the current UE and the original cell or cell group (S-MN, GNB) according to the PDU retention indication information in the MobilityFromNRCommand message. If the indication information indicates to retain the original cell, the UE retains part or all of the PDU SESSION of the current UE and the original cell or cell group (S-MN, GNB) of the original cell secondary node S-SN.

[0266] S1603 The EN-DC network continues to communicate through the retained PDU SESSION.

[0267] Wherein, after receiving the MobilityFromNRCommand message carrying the T-MN and the indication information of the retained PDU session, if the indication information indicates to retain the PDU session, the UE does not initiate a re-establishment for the retained PDU SESSION of the original cell.

[0268] The PDU session retention information can be an indication of retaining the PDU SESSION, or a list of PDU SESSIONs that need to be retained.

[0269] The PDU session retention information can be an indication of retaining the PDU SESSION, or a list of PDU SESSIONs that need to be retained.

[0270] In one application embodiment, the present embodiment provides a UE supporting inter-network handover, comprising the following operations:

[0271] The UE receives a MobilityFromNRCommand message of NR, and the MobilityFromNRCommand message contains original cell retention indication information, or cell or cell group information;

[0272] The UE determines whether to retain all or part of the PDU SESSION in the original network according to the relationship between the original cell retention indication information or the cell or cell group information and the original cell or cell group.

[0273] The UE continues to communicate through the retained PDU SESSION.

[0274] The UE retains the PDU SESSION with the original cell S-MN after the handover; the UE does not initiate a request for establishing a new PDU SESSION based on the PDU SESSION ID and / or IP address and / or APN information; and the new PDU SESSION is established.

[0275] In one application embodiment, the present embodiment provides a UE supporting inter-network handover, comprising the following operations:

[0276] The UE receives a MobilityFromNRCommand message of NR, and the MobilityFromNRCommand message contains reserved PDU SESSION information.

[0277] The UE determines whether to retain all or part of the PDU SESSION in the original network according to the reserved PDU SESSION information.

[0278] The UE continues to communicate through the retained PDU SESSION.

[0279] The UE retains the PDU SESSION with the original cell S-MN after the handover; the UE does not initiate a request for establishing a new PDU SESSION based on the PDU SESSION ID and / or IP address and / or APN information; and the new PDU SESSION is established.

[0280] The reserved PDU SESSION information can be an indication of retaining the PDU session, or a list of PDU SESSION information that needs to be retained, and the PDU SESSION information list contains information of at least one PDU SESSION.

[0281] In one application embodiment, a network node (source node) supporting inter-network handover:

[0282] The MobilityFromNRCommand or RRCCONNECTION RECONFIGURATION message is sent, and the MobilityFromNRCommand or RRCCONNECTION RECONFIGURATION message contains original cell reservation indication information, or cell or cell group information, or PDU session reservation information or DRB reservation information.

[0283] The cell reservation indication information is used to indicate that the terminal retains all or part of the radio link or radio configuration of the original cell after the handover.

[0284] The cell or cell information can be used to instruct the terminal to retain all or part of the radio link or radio configuration of the original cell after handover.

[0285] The cell retention indication information can be used to instruct the terminal to retain all or part of the radio link or radio configuration of the original cell after handover.

[0286] The DRB retention information is used to instruct the terminal to retain part or all of the DRB after cell handover.

[0287] The cell or cell information can be used to instruct the terminal to retain all or part of the radio resource configuration or all or part of the radio connection or all or part of the PDU SESSION of the original cell after handover.

[0288] The PDU seesion retention information is used to instruct the terminal to retain all or part of the radio resource configuration or all or part of the radio connection or all or part of the PDU SESSION of the original cell.

[0289] In an application embodiment, a network node (target network core network element) supporting inter-network handover:

[0290] After receiving the RRC CONNECTION RECONFIGURATION message sent by the terminal for retaining part or all of the radio link or radio resource of the original cell;

[0291] The network communicates data through the retained part or all of the radio link or radio configuration.

[0292] In an application embodiment, a network node (target network core network element) supporting inter-network handover:

[0293] After receiving the RRC CONNECTION RECONFIGURATION message sent by the terminal for retaining the PDU SESSION;

[0294] The network communicates data through the retained part or all of the PDU SESSION.

[0295] In an embodiment, the present application provides a network switching device, Figure 17 A structural schematic diagram of a network switching device provided by the embodiment of the present application. The method can be applied to the case where the UE continues to use the original radio resource before and after network switching. The network switching device can be realized by software and / or hardware, and the method is applied to a first communication node.

[0296] As Figure 17 shown, the network switching device provided by the embodiments of the present application mainly comprises a first sending module 171 and a first receiving module 172.

[0297] The first sending module 171 is configured to send a switching demand message to a core network, wherein the switching demand message carries UE context reference information on the original side.

[0298] The first receiving module 172 is configured to receive a switching control message sent by the core network, wherein the switching control message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct a source side network node not to release resources used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side.

[0299] In an exemplary embodiment, the first receiving module 172 receives a secondary node addition request message sent by a second communication node before receiving the switching control message sent by the core network in the case that the network switching is SA 5G network switching to EN-DC network, wherein the secondary node addition request message carries the UE context reference information on the original side.

[0300] The first sending module 171 is configured to send a secondary node addition notification message to the second communication node, wherein the secondary node addition notification message is used to notify a target node that the UE establishes dual connectivity under the EN-DC network.

[0301] In an exemplary embodiment, the UE context reference information on the original side comprises a source 5G radio access network node (Source NG-RAN node) and / or an access network terminal interface application protocol identifier (RAN UE NGAP ID).

[0302] In an exemplary embodiment, the secondary node addition request message carrying the UE context reference information on the original side is sent by the core network to the second communication node.

[0303] In an exemplary embodiment, in the case that the network switching is SA 5G network switching to EN-DC network, the first communication node is a 5G base station in the SA 5G network, and the second communication is an LTE eNB in the EN-DC network.

[0304] In an example implementation, the first sending module 171 is configured to, in the case that the network switching is EN-DC network switching to SA 5G network, send a secondary node addition request message to the second communication node after receiving the switching control message sent by the core network, wherein the secondary node addition request message carries the UE context reference information on the original side.

[0305] The first receiving module 172 is configured to receive a secondary node addition notification message sent by the second communication node, wherein the secondary node addition notification message is used to notify the UE to establish dual connectivity under the EN-DC network.

[0306] In an example implementation, the first sending module 171 is configured to, in the case that it is determined to retain the used resource, send a third message to the third communication node, wherein the third message carries the radio resource indication information.

[0307] In an example implementation, the first sending module 171 is configured to, in the case that the network switching is SA 5G network switching to EN-DC network, send a UE release message to the second communication node after sending the UE release completion message to the core network, wherein the UE release message is used to instruct the second communication node to release the signaling connection with the node.

[0308] In an example implementation, the UE context reference information on the original side includes an SN UE X2APID information unit for identification.

[0309] In an example implementation, in the case that the network switching is EN-DC network switching to SA 5G network, the first communication node is an LTE eNB in the EN-DC network, and the secondary node is a 5G base station in the 5G network.

[0310] The network switching device provided in the embodiment can perform the network switching method provided in any embodiment of the application, and has the corresponding function modules and beneficial effects of performing the method. Technical details not described in detail in the embodiment can be referred to the network switching method provided in any embodiment of the application.

[0311] It is worth noting that, in the above-mentioned embodiments of the network switching device, each unit and module included is only divided according to the function logic, but is not limited to the above-mentioned division, as long as the corresponding function can be realized; in addition, the specific name of each functional unit is only for convenient mutual distinction, and does not limit the protection scope of the application.

[0312] In an embodiment, the application provides a network switching device, Figure 18A structural schematic diagram of a network switching device provided by an embodiment of the present application. The method can be applied to the case that the UE continues to use the original wireless resource before and after network switching. The network switching device can be realized by software and / or hardware, and the method is applied to a second communication node.

[0313] As shown in Figure 18 The network switching device provided by the embodiment of the present application mainly includes a second receiving module 181 and a second sending module 182.

[0314] The second receiving module 181 is configured to receive a switching request message sent by a core network, wherein the switching request message carries UE context reference information on the original side;

[0315] The second sending module 182 is configured to send a switching request notification message to the core network, wherein the switching request notification message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct a source side network node not to release the resource used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side.

[0316] In an exemplary embodiment, the second sending module 182 is configured to, in the case of network switching from SA 5G network to EN-DC network, send a secondary node addition request message to a first communication node after receiving the switching request message sent by the core network, wherein the secondary node addition request message carries the UE context reference information on the original side;

[0317] The second receiving module 181 is configured to receive a secondary node addition notification message sent by the first communication node, wherein the secondary node addition notification message is used to notify a target node that the UE establishes dual connectivity under the EN-DC network.

[0318] In an exemplary embodiment, the second receiving module 181 is configured to, in the case of network switching from EN-DC network to SA 5G network, receive a secondary node addition request message sent by the first communication node, wherein the secondary node addition request message carries the UE context reference information on the original side;

[0319] The second sending module 182 is configured to send a secondary node addition notification message to the first communication node, wherein the secondary node addition notification message is used to notify that the UE establishes dual connectivity under the EN-DC network.

[0320] In an example implementation, the second receiving module 181 is configured to receive a UE release message sent by the first communication node in the case that the network switching is the SA 5G network switching to the EN-DC network, wherein the UE release message is used to instruct the node to release the signaling connection with the first communication node.

[0321] The network switching apparatus provided in the embodiment can perform the network switching method provided in any of the embodiments of the present application, and has the corresponding function modules and advantages of performing the method. Technical details not described in the embodiment can be referred to the network switching method provided in any of the embodiments of the present application.

[0322] It is worth noting that, in the embodiments of the network switching apparatus described above, each unit and module included is only divided according to the function logic, but is not limited to the above division, as long as the corresponding function can be realized; in addition, the specific name of each functional unit is only for the convenience of mutual differentiation, and does not serve to limit the protection scope of the present application.

[0323] In an embodiment, the present application provides a network switching apparatus, Figure 19 A structural schematic diagram of a network switching apparatus provided in an embodiment of the present application. The method can be applied to the case that the UE continues to use the original wireless resource before and after the network switching. The network switching apparatus can be realized by software and / or hardware, and the method is applied to the third communication node.

[0324] As Figure 19 shown, the network switching apparatus provided in the embodiments of the present application mainly includes a third receiving module 191 and a reservation module 192.

[0325] The third receiving module 191 is configured to receive a third message, wherein the third message carries wireless resource indication information;

[0326] The reservation module 192 is configured to reserve part or all of the wireless resources of the original cell according to the wireless resource indication information.

[0327] In an example implementation, the third message is sent by the first communication node.

[0328] In an example implementation, the third message is an RRC reconfiguration message, or the third message is a radio control message.

[0329] In an example implementation, the wireless resource indication information includes: original cell reservation indication information, or secondary cell information, or reserved PDU session information, or NAS resource reservation indication, or suspension indication, or QoS flow reservation information.

[0330] In an exemplary embodiment, the QoS flow reservation information is used to indicate that a QoS flow or QoS flow information is reserved after the network switching.

[0331] In an exemplary embodiment, the original cell reservation indication information is used to indicate that part or all of the radio resources of the original cell are reserved after the network switching.

[0332] In an exemplary embodiment, based on the relationship between the secondary cell information and the original cell information, part or all of the radio resources of the original cell are reserved after the network switching.

[0333] In an exemplary embodiment, the secondary cell information is single secondary cell information or a secondary cell list.

[0334] In an exemplary embodiment, the NAS resource reservation indication is used to indicate that part or all of the NAS resources of the original cell are reserved after the network switching, wherein the part or all of the NAS resources include one or more of the following: UE registration state, TAU information, integrity and encryption information.

[0335] In an exemplary embodiment, the suspension indication is used to indicate that part or all of the radio resources of the original cell are reserved after the network switching.

[0336] In an exemplary embodiment, the part or all of the radio resources include part or all of the radio connections, wherein the radio connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

[0337] In an exemplary embodiment, the part or all of the radio resources include part or all of the radio configurations, wherein the radio configurations include at least one of the following: L1 physical layer configuration, MAC layer configuration, RLC layer configuration, RRC layer configuration, PDCP layer configuration, NAS layer configuration.

[0338] In an exemplary embodiment, the reserved PDU session information is used to indicate that a PDU session is reserved after the network switching.

[0339] In an exemplary embodiment, the reserved PDU session information includes PDU session reservation indication information, or a list of PDU session information to be reserved; wherein the list of PDU session information includes one or more PDU session information.

[0340] In an exemplary embodiment, the reservation module 192 is configured to continue to use the downlink bandwidth part BWP; and receive downlink data transmitted by the PDSCH according to RIV indication information in the downlink control information DCI.

[0341] In one example implementation, if the following condition is satisfied then

[0342] if the following condition is not satisfied then

[0343] where L CRBS is the length of the contiguous RBs, N( DL RB ) is the number of RBs of the downlink bandwidth.

[0344] In one example implementation, the reserving module 192 is configured to reserve a C-RNTI of the UE, wherein the C-RNTI of the UE is used for receiving DCI information.

[0345] In one example implementation, the reserving module 192 is configured to reserve a resource allocation manner of a PUCCH (Physical Uplink Control Channel) and / or a set of allocated PUCCH resources.

[0346] In one example implementation, the reserving module 192 is configured to reserve one or more data radio bearers (DRBs), reserve one or more signaling radio bearers (SRBs), and modify one of the SRB1 or SRB2 to SRB3.

[0347] In one example implementation, the reserving module 192 is configured to continue using the original PDU session for data transmission or reestablish a data connection after the first communication node initiates the PDU session.

[0348] In one example implementation, the reserving module 192 is configured to use the security context before the handover.

[0349] In one example implementation, the reserving module 192 is configured to reserve a DCCH (Dedicated Control Channel).

[0350] In one example implementation, reserving the DCCH channel includes continuing to send and receive data according to the DCCH channel.

[0351] In one example implementation, the reserving module 192 is configured to reserve part or all of QoS (Quality of Service) flows or QoS flow information.

[0352] In one example implementation, reserving the QoS flow or QoS flow information includes continuing to use the QoS flow and / or QoS flow information for user plane data transmission and / or reception.

[0353] The network switching apparatus provided in the embodiment can execute the network switching method provided in any embodiment of the present application, and has the corresponding function modules and advantages of executing the method. The technical details not described in the embodiment can be found in the network switching method provided in any embodiment of the present application.

[0354] It is worth noting that, in the embodiments of the network switching apparatus, each unit and module included is only divided according to the function logic, but is not limited to the above division, as long as the corresponding function can be realized; in addition, the specific name of each functional unit is only for the convenience of mutual differentiation, and does not limit the protection scope of the present application.

[0355] The embodiment of the present application also provides a device, Figure 20 is a structural schematic diagram of a device provided by the embodiment of the present application, as Figure 20 shown, the device includes a processor 201, a memory 202, an input device 203, an output device 204 and a communication device 205; the number of processors 201 in the device can be one or more, Figure 20 in which one processor 201 is taken as an example; the processor 201, the memory 202, the input device 203 and the output device 204 in the device can be connected through a bus or other means, Figure 20 in which the connection through the bus is taken as an example.

[0356] The memory 202 as a kind of computer readable storage medium, it can be used to store software program, computer executable program and module, such as the program instruction / module (for example, the first sending module 171 and the first receiving module 172 in the network switching apparatus) corresponding to the network switching method in the embodiment of the present application, such as the program instruction / module (for example, the second receiving module 181 and the second sending module 182 in the network switching apparatus) corresponding to the network switching method in the embodiment of the present application, such as the program instruction / module (for example, the third receiving module 191 and the reservation module 192 in the network switching apparatus) corresponding to the network switching method in the embodiment of the present application. The processor 201 executes the various function applications and data processing of the device by running the software program, instruction and module stored in the memory 202, that is, any method provided by the embodiment of the present application is realized.

[0357] The memory 202 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system and application programs required by at least one function; and the data storage area can store data created according to the use of the device, etc. In addition, the memory 202 can include a high-speed random access memory, and can also include a non-volatile memory, such as at least one magnetic disk storage device, a flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 202 can further include a memory remotely arranged with respect to the processor 201, which can be connected to the device through a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0358] The input device 203 can be used to receive input digital or character information, and to generate key signal inputs related to the user settings and function controls of the device. The output device 204 can include a display device such as a display screen.

[0359] The communication device 205 can include a receiver and a transmitter. The communication device 205 is arranged to perform information receiving and transmitting communication according to the control of the processor 201.

[0360] It should be noted that, in the case where the above device is a first communication node, the processor 201 performs various function applications and data processing by running the programs stored in the system memory 202, such as implementing the network switching method provided by the embodiments of the present application, which is applied to the first communication node, and includes:

[0361] sending a switching demand message to the core network, wherein the switching demand message carries UE context reference information on the original side;

[0362] receiving a switching control message sent by the core network, wherein the switching control message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct the source side network node not to release the resources used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side.

[0363] Of course, those skilled in the art can understand that the processor 201 can also implement the technical solutions of the network switching information method provided by any of the embodiments of the present application. The hardware structure and functions of the device can be referred to the content explanation of the present embodiment.

[0364] It should be noted that, in the case where the above device is a second communication node, the processor 201 performs various function applications and data processing by running the programs stored in the system memory 202, such as implementing the network switching method provided by the embodiments of the present application, which is applied to the second communication node, and includes:

[0365] receiving a handover request message sent by the core network, wherein the handover request message carries UE context reference information at the original side;

[0366] sending a handover request notification message to the core network, wherein the handover request notification message carries UE context retention information at the original side, wherein the UE context retention information at the original side is used to instruct the source side network node not to release resources used by the UE, and the UE context retention information at the original side is determined by the UE context reference information at the original side.

[0367] Of course, those skilled in the art can understand that the processor 201 can also implement the technical solutions of the network switching method provided by any of the embodiments of the present application. The hardware structure and functions of the device can be explained in the content of the present embodiment.

[0368] It should be noted that, in the case of the above-mentioned device being a third communication node, the processor 201 executes various functional applications and data processing by running the program stored in the system memory 202, such as implementing a network switching method provided by the embodiments of the present application, including:

[0369] receiving a third message, wherein the third message carries wireless resource indication information;

[0370] reserving part or all of the wireless resources of the original cell according to the wireless resource indication information.

[0371] Of course, those skilled in the art can understand that the processor 201 can also implement the technical solutions of the network switching method provided by any of the embodiments of the present application. The hardware structure and functions of the device can be explained in the content of the present embodiment.

[0372] The present application also provides a storage medium containing computer executable instructions, which, when executed by a computer processor, are used to execute a network switching method, the method is applied to a first communication node, including:

[0373] sending a handover demand message to the core network, wherein the handover demand message carries UE context reference information at the original side;

[0374] receiving a handover control message sent by the core network, wherein the handover control message carries UE context retention information at the original side, wherein the UE context retention information at the original side is used to instruct the source side network node not to release resources used by the UE, and the UE context retention information at the original side is determined by the UE context reference information at the original side.

[0375] Of course, the computer executable instruction of the storage medium provided by the embodiment of the present application is not limited to the operation of the wireless bearer allocation method as described above, and can also perform the related operation in the wireless bearer allocation method provided by any embodiment of the present application.

[0376] The embodiment of the present application further provides a storage medium containing computer executable instructions, which, when executed by a computer processor, are used to perform a network switching method, the method being applied to a second communication node, comprising:

[0377] receiving a switching request message sent by a core network, wherein the switching request message carries UE context reference information on a previous side;

[0378] sending a switching request notification message to the core network, wherein the switching request notification message carries UE context retention information on the previous side, wherein the UE context retention information on the previous side is used to instruct a source side network node not to release resources used by the UE, and the UE context retention information on the previous side is determined by the UE context reference information on the previous side.

[0379] Of course, the computer executable instruction of the storage medium provided by the embodiment of the present application is not limited to the operation of the context message management method as described above, and can also perform the related operation in the network switching method provided by any embodiment of the present application.

[0380] The embodiment of the present application further provides a storage medium containing computer executable instructions, which, when executed by a computer processor, are used to perform a network switching method, comprising:

[0381] receiving a third message, wherein the third message carries wireless resource indication information;

[0382] retaining part or all of the wireless resources of the original cell according to the wireless resource indication information.

[0383] Of course, the computer executable instruction of the storage medium provided by the embodiment of the present application is not limited to the operation of the release method as described above, and can also perform the related operation in the network switching method provided by any embodiment of the present application.

[0384] Those skilled in the art can clearly understand, through the above description of the embodiments, that the present application can be realized by means of software and necessary universal hardware, and of course can also be realized by hardware, but in many cases the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a software product in essence or in the form of a part that contributes to the prior art, and the computer software product can be stored in a computer readable storage medium, such as a floppy disk, a read-only memory (ROM), a random access memory (RAM), a FLASH memory, a hard disk, or an optical disk, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present application.

[0385] The above merely describes exemplary embodiments of the present application, and is not intended to limit the protection scope of the present application.

[0386] Those skilled in the art will appreciate that the term user terminal encompasses any suitable type of wireless user device, such as a mobile phone, a portable data processing apparatus, a portable web browser, or a vehicle-mounted mobile station.

[0387] Generally, various embodiments of the present application can be implemented in hardware or special-purpose circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while other aspects can be implemented in firmware or software which can be executed by a controller, microprocessor or other computing device, although the present application is not limited thereto.

[0388] Embodiments of the present application can 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 can be assembly instructions, instruction set architecture (ISA) instructions, machine 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.

[0389] The block diagrams of any logical flow of the present application in the drawings can represent program steps or can represent interconnected logic circuits, modules, and functions, or can represent a combination of program steps and logic circuits, modules, and functions. The computer program can be stored on a memory. The memory can be of any type suitable to the local technical environment and can be implemented using any suitable data storage technology, such as, but not limited to, random access memory (RAM), read only memory (ROM), optical storage devices, and systems, such as digital versatile disc (DVD) or CD-ROM, and the like. The computer readable media can include non-transitory storage media. The data processor can be of any type suitable to the local technical environment, and can include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASIC), programmable logic devices (PLD), and processors based on multi-core processor architectures, as examples.

[0390] A detailed description of exemplary embodiments of the application has been provided above with reference to the drawings. Numerous modifications and adjustments to the above embodiments will be apparent to those skilled in the art in view of the foregoing description, without departing from the scope of the application. Accordingly, the proper scope of the application is to be determined by the claims.

Claims

1. A network handover method, characterized by, The method is applied to a first communication node, comprising: sending a handover requirement message to a core network, wherein the handover requirement message carries UE context reference information on the original side; receiving a handover control message sent by the core network, wherein the handover control message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct the original side network node not to release the resources used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side; The UE context retention information on the original side satisfies one of the following conditions: When the network switching is SA 5G network switching to EN-DC network, the information is used to instruct the original side network node not to release the resources used by the UE, wherein the S-gNB is the target secondary node T-SN and refers to the first communication node and the original side network node; When the network switching is EN-DC network switching to SA 5G network, the information is used to instruct the original side network node not to release the resources used by the UE, wherein the S-SN is the target next generation base station T-gNB and refers to the original side network node, and the S-MN is the first communication node.

2. The method of claim 1, wherein, In the case of network switching from SA 5G network to EN-DC network, before receiving the handover control message sent by the core network, the method further comprises: receiving a secondary node addition request message sent by a second communication node, wherein the secondary node addition request message carries the UE context reference information on the original side; sending a secondary node addition notification message to the second communication node, wherein the secondary node addition notification message is used to inform the target node that the UE establishes dual connectivity under the EN-DC network.

3. The method of claim 2, wherein, The UE context reference information on the original side includes a source 5G radio access network node Source NG-RAN node and / or an access network terminal interface application protocol identifier RAN UE NGAP ID.

4. The method of claim 2, wherein, The core network sends the secondary node addition request message carrying the UE context reference information on the original side to the second communication node.

5. The method according to any one of claims 2-4, characterized in that, In the case of network switching from SA 5G network to EN-DC network, the first communication node is a 5G base station in the SA 5G network, and the second communication node is an LTE eNB in the EN-DC network.

6. The method of claim 1, wherein, In the case of network switching from EN-DC network to SA 5G network, after receiving the handover control message sent by the core network, the method further comprises: sending a secondary node release request message to a second communication node, wherein the secondary node release request message carries the UE context retention information on the original side; receiving a secondary node release request notification message sent by the second communication node.

7. The method of claim 1, wherein, In the case of determining to reserve the use of resources, a third message is sent to a third communication node, wherein the third message carries radio resource indication information.

8. The method of claim 6, wherein, In the case of network switching from EN-DC network to SA 5G network, after sending the UE release completion message to the core network, the method further comprises: sending a UE release message to the second communication node, wherein the UE release message is used to instruct the second communication node to release the signaling connection with the node.

9. The method of claim 8, wherein, The UE context reference information on the original side includes an SN UE X2AP ID information element to identify.

10. The method according to any one of claims 8-9, characterized in that, In a case where the network switching is EN-DC network switching to SA 5G network, the first communication node is an LTE eNB in the EN-DC network, and the second communication node is a 5G base station in the 5G network.

11. A network handover method, characterized by, The method is applied to a second communication node and includes: receiving a handover request message sent by a core network, wherein the handover request message carries UE context reference information on the original side; sending a handover request notification message to the core network, wherein the handover request notification message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct the original side network node not to release resources used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side; The UE context retention information on the original side satisfies one of the following conditions: When the network switching is SA 5G network switching to EN-DC network, the information is used to instruct the original side network node not to release the resources used by the UE, wherein the S-gNB is a target secondary node T-SN and refers to the original side network node, and the T-MN is the second communication node; When the network switching is EN-DC network switching to SA 5G network, the information is used to instruct the original side network node not to release the resources used by the UE, wherein the S-SN is a target next generation base station T-gNB and refers to the second communication node and the original side network node.

12. The method of claim 11, wherein, In a case where the network switching is SA 5G network switching to EN-DC network, after receiving the handover request message sent by the core network, the method includes: sending a secondary node addition request message to the first communication node, wherein the secondary node addition request message carries the UE context reference information on the original side; receiving a secondary node addition notification message sent by the first communication node, wherein the secondary node addition notification message is used to notify the target node that the UE establishes dual connectivity under the EN-DC network.

13. The method of claim 12, wherein, In a case where the network switching is EN-DC network switching to SA 5G network, the method further includes: receiving a secondary node release request message sent by the first communication node, wherein the secondary node release request message carries the UE context retention information on the original side; sending a secondary node release request notification message to the first communication node.

14. The method of claim 11, wherein, In a case where the network switching is SA 5G network switching to EN-DC network, the method further includes: receiving a UE release message sent by the first communication node, wherein the UE release message is used to instruct the node to release the signaling connection with the first communication node.

15. A network handover method, characterized by, The method is applied to a third communication node and includes: receiving a third message, wherein the third message carries wireless resource indication information; reserving part or all of the wireless resources of the original cell according to the wireless resource indication information; The third message is sent by the first communication node. The first communication node is configured to send a handover requirement message to a core network, wherein the handover requirement message carries UE context reference information on the original side; The first communication node is configured to receive a handover control message sent by the core network, wherein the handover control message carries UE context retention information on the original side, wherein the UE context retention information on the original side is used to instruct the original side network node not to release the resources used by the UE, and the UE context retention information on the original side is determined by the UE context reference information on the original side; The UE context retention information on the original side satisfies one of the following conditions: When the network handover is SA 5G network handover to EN-DC network, the information is used to instruct the original side network node not to release the resources used by the UE, wherein the S-gNB is the target secondary node T-SN and refers to the first communication node and the original side network node; When the network handover is EN-DC network handover to SA 5G network, the information is used to instruct the original side network node not to release the resources used by the UE, wherein the S-SN is the target next generation base station T-gNB and refers to the original side network node, and the S-MN is the first communication node.

16. The method of claim 15, wherein, The third message is an RRC reconfiguration message, or the third message is a radio control message.

17. The method of claim 15, wherein, The radio resource indication information includes original cell reservation indication information, secondary cell information, reserved PDU session information, NAS resource reservation indication, suspension indication, or QoS flow reservation information.

18. The method of claim 17, wherein, The original cell reservation indication information is used to instruct to reserve part or all of the radio resources of the original cell after the network handover.

19. The method of claim 17, wherein, Based on the relationship between the secondary cell information and the original cell information, part or all of the radio resources of the original cell are reserved after the network handover.

20. The method of claim 19, wherein, The secondary cell information is single secondary cell information or a secondary cell list.

21. The method of claim 17, wherein, The NAS resource reservation indication is used to instruct to reserve part or all of the NAS resources of the original cell after the network handover, wherein the part or all of the NAS resources include one or more of the following: registration state of the UE, TAU information, integrity and encryption information.

22. The method of claim 17, wherein, The suspension indication is used to instruct to reserve part or all of the radio resources of the original cell after the network handover.

23. The method of claim 15, wherein, The part or all of the radio resources include part or all of the radio connections, wherein the radio connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, and NAS layer connection.

24. The method of claim 15, wherein, The part or all of the radio resources include part or all of the radio configurations, wherein the radio configurations include at least one of the following: L1 physical layer configuration, MAC layer configuration, RLC layer configuration, RRC layer configuration, PDCP layer configuration, and NAS layer configuration.

25. The method of claim 17, wherein, The reserved PDU session information is used to instruct to reserve PDU sessions after the network handover.

26. The method of claim 25, wherein, The reserved PDU session information includes PDU session reservation indication information or a PDU session information list that needs to be reserved, wherein the PDU session information list includes one or more PDU session information.

27. The method of claim 17, wherein, The QoS flow reservation information is used to indicate that a QoS flow or QoS flow information is reserved after network switching.

28. The method of claim 15, wherein, Reserving part or all of the wireless resources includes: Continuing to use the downlink bandwidth part (BWP); Receiving downlink data transmitted by the PDSCH according to RIV indication information in the downlink control information (DCI).

29. The method of claim 28, wherein, If the following conditions are satisfied then ; If not satisfied , then ; wherein L CRBs is the length of the continuous RBs, is the number of downlink RBs.

30. The method of claim 15, wherein, Reserving part or all of the wireless resources includes: Reserving a C-RNTI of the UE, wherein the C-RNTI of the UE is used for DCI reception information.

31. The method of claim 15, wherein, Reserving part or all of the wireless resources includes: Reserving a resource allocation manner of a physical uplink control channel (PUCCH); and / or, Allocating a PUCCH resource set.

32. The method of claim 15, wherein, Reserving part or all of the wireless resources includes: Reserving one or more data radio bearers (DRBs); Reserving one or more signaling radio bearers (SRBs); Modifying one of SRB1 or SRB2 to SRB3.

33. The method of claim 15, wherein, Reserving part or all of the wireless resources includes: Continuing to use the original PDU session for data transmission; Or, after the first communication node initiates the PDU session, reestablishing and recovering the data connection.

34. The method of claim 15, wherein, Reserving part or all of the wireless resources includes: Using a security context before the switching.

35. The method of claim 15, wherein, Reserving part or all of the wireless resources includes reserving a DCCH channel.

36. The method of claim 35, wherein, Reserving the DCCH channel includes: Continuing to transmit and receive data according to the DCCH channel.

37. The method of claim 15, wherein, Reserving part or all of the wireless resources includes reserving part or all of QoS flow or QoS flow information.

38. The method of claim 37, wherein, Reserving the QoS flow or QoS flow information includes: Continuing to use the QoS flow and / or QoS flow information for user plane data transmission and / or reception.

39. A network switching apparatus, comprising: The apparatus is configured in a first communication node, comprising: A first sending module configured to send a switching demand message to a core network, wherein the switching demand message carries UE context reference information on a previous side; A first receiving module configured to receive a switching control message sent by the core network, wherein the switching control message carries UE context retention information on the previous side, wherein the UE context retention information on the previous side is used to instruct the network node on the previous side not to release resources used by the UE, and the UE context retention information on the previous side is determined by the UE context reference information on the previous side; The UE context retention information on the previous side satisfies one of the following conditions: When the network switching is SA 5G network switching to EN-DC network, the information is used to instruct the network node on the previous side not to release the resources used by the UE, wherein the S-gNB is a target secondary node (T-SN) and refers to the first communication node and the network node on the previous side; When the network switching is EN-DC network switching to SA 5G network, the information is used to instruct the network node on the previous side not to release the resources used by the UE, wherein the S-SN is a target next generation base station (T-gNB) and refers to the network node on the previous side, and the S-MN is the first communication node.

40. A network switching apparatus, comprising: The apparatus is configured in a second communication node, comprising: a second receiving module, configured to receive a handover request message sent by a core network, wherein the handover request message carries UE context reference information at a source side; a second sending module, configured to send a handover request notification message to the core network, wherein the handover request notification message carries UE context retention information at the source side, wherein the UE context retention information at the source side is used to instruct a network node at the source side not to release resources used by the UE, and the UE context retention information at the source side is determined by the UE context reference information at the source side; the UE context retention information at the source side satisfies one of the following conditions: when the network handover is SA 5G network handover to EN-DC network, the information is used to instruct the network node at the source side not to release the resources used by the UE, wherein the S-gNB is a target secondary node T-SN and refers to the network node at the source side, and the T-MN is the second communication node; when the network handover is EN-DC network handover to SA 5G network, the information is used to instruct the network node at the source side not to release the resources used by the UE, wherein the S-SN is a target next generation base station T-gNB and refers to the second communication node and the network node at the source side.

41. A network switching apparatus, comprising: the device is configured in a third communication node, comprising: a third receiving module, configured to receive a third message, wherein the third message carries radio resource indication information; a reservation module, configured to reserve part or all of the radio resources of the original cell according to the radio resource indication information; the third message is sent by a first communication node; the first communication node is used to send a handover demand message to a core network, wherein the handover demand message carries UE context reference information at a source side; the first communication node is used to receive a handover control message sent by the core network, wherein the handover control message carries UE context retention information at the source side, wherein the UE context retention information at the source side is used to instruct a network node at the source side not to release resources used by the UE, and the UE context retention information at the source side is determined by the UE context reference information at the source side; the UE context retention information at the source side satisfies one of the following conditions: when the network handover is SA 5G network handover to EN-DC network, the information is used to instruct the network node at the source side not to release the resources used by the UE, wherein the S-gNB is a target secondary node T-SN and refers to the first communication node and the network node at the source side; when the network handover is EN-DC network handover to SA 5G network, the information is used to instruct the network node at the source side not to release the resources used by the UE, wherein the S-SN is a target next generation base station T-gNB and refers to the network node at the source side, and the S-MN is the first communication node.

42. An apparatus comprising: comprising: one or more processors; a memory for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1-38.

43. A storage medium characterized by The storage medium stores a computer program, and the computer program is executed by the processor to implement the method in any one of claims 1-38.

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