Network switching method, apparatus, device, and storage medium

Abstract

The application provides a network switching method and device, equipment and a storage medium. The method is applied to a first communication node and includes the following steps: receiving a first message, wherein the first message carries wireless resource indication information; and reserving part or all of the wireless resources of an original cell according to the wireless resource indication information.

Description

Technical Field

[0001] This application relates to the field of communication technology, specifically to a network switching method, apparatus, device, and storage medium. Background Technology

[0002] After a user equipment (UE) hands over to a new 5G base station, the target 5G base station can be the same as the secondary base station (SN) in the EN-DC network before the handover, allowing the UE to continue using its original radio resources. The secondary base station (SN) in the EN-DC network after the handover can also be the same as the 5G base station before the handover, allowing the UE to continue using its original radio resources. How to ensure that the 5G base station before the handover can recognize that the same base station exists before and after the handover and retain the UE's radio resources is a problem that needs to be solved. Summary of the Invention

[0003] This application provides methods, apparatus, devices, and storage media for network switching.

[0004] In a first aspect, embodiments of this application provide a network switching method, the method being applied to a first communication node, comprising:

[0005] Receive a first message, wherein the first message carries radio resource indication information;

[0006] Based on the radio resource indication information, some or all of the original cell's radio resources are retained.

[0007] Secondly, embodiments of this application provide a network switching method, the method being applied to a second communication node, comprising:

[0008] A first message is sent to the first communication node, wherein the first message carries radio resource indication information, which is used to indicate that some or all of the radio resources of the original cell are retained after the network handover.

[0009] Thirdly, embodiments of this application provide a network switching device, the device being configured at a first communication node, comprising:

[0010] The receiving module is configured to receive a first message, wherein the first message carries radio resource indication information;

[0011] The reservation module is configured to reserve some or all of the original cell's radio resources based on radio resource indication information.

[0012] Fourthly, embodiments of this application provide a network switching device, the device being configured at a first communication node, comprising:

[0013] The sending module is configured to send a first message to a first communication node, wherein the first message carries radio resource indication information, which is used to indicate that some or all of the radio resources of the original cell are retained after network handover.

[0014] Fifthly, embodiments of this application provide an apparatus, the apparatus comprising:

[0015] One or more processors;

[0016] Memory, used to store one or more programs;

[0017] 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 this application.

[0018] Sixthly, embodiments of this application provide a storage medium storing a computer program, which, when executed by a processor, implements any of the methods described in the embodiments of this application.

[0019] Further details regarding the above embodiments and other aspects of this application, as well as their implementations, are provided in the accompanying drawings, detailed description, and claims. Attached Figure Description

[0020] Figure 1 This is a typical 5G network architecture diagram;

[0021] Figure 2 This is a schematic diagram of the EN-DC architecture in the existing technology;

[0022] Figure 3 A flowchart illustrating a network switching method provided in an embodiment of this application;

[0023] Figure 3a A flowchart illustrating a network switching method provided in an embodiment of this application;

[0024] Figure 4 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call;

[0025] Figure 5 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call;

[0026] Figure 6 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call;

[0027] Figure 7 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call;

[0028] Figure 8 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call;

[0029] Figure 9 This application provides a flowchart of a method for a terminal to switch networks based on a measurement report of the current network;

[0030] Figure 10 This application provides a flowchart of a method for a terminal to switch networks based on a measurement report of the current network;

[0031] Figure 11 This application provides a flowchart of a method for a terminal to switch networks based on a measurement report of the current network;

[0032] Figure 12 This application provides a flowchart of a method for a terminal to switch networks based on a measurement report of the current network;

[0033] Figure 13 This is a schematic diagram of the structure of a network switching device provided in an embodiment of this application;

[0034] Figure 13a This is a schematic diagram of the structure of a network switching device provided in an embodiment of this application;

[0035] Figure 14 This is a schematic diagram of the structure of a device provided in an embodiment of this application. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be arbitrarily combined with each other.

[0037] The steps illustrated in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases the steps shown or described may be performed in a different order than that presented here.

[0038] 5G network base stations (NG-RAN nodes, gNB) can support high-capacity services (such as MBB). Figure 1 This is a typical diagram of a 5G network architecture. (Example) Figure 1As shown, a 5G network includes a 5G core network (5GC) and 5G base stations (gNBs). The 5GC contains network element nodes such as the Access Mobility Function (AMF), Session Management Function (SMF), and User Plane Function (UPF). 5G base stations are also called gNBs, or Next Generation Radio Access Network (NG-RAN) nodes. They adopt a new physical layer air interface design, supporting New Radio (NR), NR RAT standard base stations, and related base station network element interfaces. 5G base stations interconnect with the 5GC through standardized NG interfaces (including NG-C control plane (signaling) connections and NG-U user plane (user data) connections), while NG-RAN base stations (gNBs or ng-eNBs) interconnect through Xn interfaces (including Xn-C control plane connections and Xn-U user plane connections).

[0039] 5G can provide MBB services, but existing 5G networks may not support voice services, specifically Voice over New Radio (VoNR) functionality under 5G access. In this case, the mobile terminal (user equipment, UE) connected to the 5G network needs to switch to a 4G (LTE) network to establish voice services, as 4G networks generally support VoLTE.

[0040] The 4G network includes the 4G core network, namely the Evolved Packet Core (EPC) and the 4G Radio Access Network (LTE RAN). The EPC includes basic network element nodes such as the Mobility Management Entity (MME), Serving Gateway (SGW), and PDN Gateway (PGW), while the 4G RAN includes the interfaces between the Evolved NodeB (eNB) and related base station network elements.

[0041] To simultaneously support voice services and MBB services on mobile terminals, an EN-DC network architecture is provided. Figure 2 This is a schematic diagram of the EN-DC architecture in existing technology, such as... Figure 2As shown, a terminal simultaneously connects to an eNB (4G base station, LTE base station) as the master node (MN) and to a gNB (5G base station, NR base station) as the secondary node (SN). The master eNB connects to the 4G core network EPC via the S1 interface and to the 5G base station via the X2 interface. The 5G gNB can also connect to the EPC via the S1-U interface and to other 5G base stations via the X2-U interface.

[0042] In existing access networks, a network mode in which two base stations (such as a 4G base station and a 5G base station in an EN-DC architecture) are tightly coupled to jointly provide communication services to the UE is called a dual connectivity (DC) network. Figure 2 As shown, these two base stations are further divided into a primary base station (MN, also known as the first network element) and a secondary node (SN, also known as the second network element). The dual-connectivity network design can improve the communication capacity of a single session.

[0043] In a scenario where a UE switches from an SA 5G network to an EN-DC network, the UE was originally connected to the SA 5G network and was performing MBB services. Now, it needs to perform voice services (e.g., answering or initiating voice calls), but the 5G network does not support voice services. Therefore, the UE needs to switch to the LTE network to establish a VoLTE connection. The UE also needs to continue its original MBB services. Thus, the UE switches to the EN-DC network, establishing a VoLTE connection on the LTE RAN node and establishing its original MBB service connection on the NG-RAN node.

[0044] In scenarios where a UE switches from the EN-DC network to the SA 5G network, the UE was originally connected to the EN-DC network, S-MN (the original master node was an LTE eNB), and S-SN (the original second node was a gNB, also known as an NG-RANnode). When the UE ends VoLTE service (e.g., hangs up a call) and continues 5G service (e.g., broadband streaming service, MBB service), the UE switches to the SA 5G network (standalone NR).

[0045] For the first scenario described above, when the secondary base station SN in the EN-DC network after the UE handover is the same as the SA 5G base station before the handover, a method is provided to allow the UE to continue using the radio resources on that same 5G base station without releasing them. A similar method is provided for the second scenario. The target 5G base station after the UE handover can recognize that it is the same 5G base station as the original 5G base station before the handover, and the UE can continue to use the original radio resources.

[0046] However, no method is provided to allow the 5G base station before the UE handover to be aware of this and retain the UE's radio resources. Due to this technical flaw, the original base station before the UE handover will release the UE's radio resources after learning that the handover is successful, thus preventing the target 5G base station after the handover from continuing to use the UE's radio resources.

[0047] To address the aforementioned issues, this application provides a method, apparatus, device, and storage medium for network handover, enabling the target 5G base station after a UE handover to recognize that it is the same 5G base station as the original 5G base station before the handover, allowing the UE to continue using the original radio resources.

[0048] In one embodiment, this application provides a network switching method. Figure 3 This is a flowchart illustrating a network handover method provided in an embodiment of this application. This method is applicable to situations where the UE continues to use its original radio resources before and after a network handover. This method can be executed by the network handover device provided in this application, which can be implemented in software and / or hardware, and the method is applied to a first communication node.

[0049] like Figure 3 As shown, the network switching method provided in this application embodiment mainly includes steps S11 and S12.

[0050] S11. Receive a first message, wherein the first message carries radio resource indication information;

[0051] S12. Retain some or all of the original cell's radio resources according to the radio resource indication information.

[0052] In one exemplary implementation, the first message is sent by the second communication node. In this embodiment, the first communication node can be understood as a user terminal in the network. In this application embodiment, the user terminal is a device with wireless transceiver capabilities that can be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted; it can also be deployed on water (such as ships); and it can also be deployed in the air (e.g., on airplanes, balloons, and satellites). The user terminal can be a mobile phone, tablet computer, computer with wireless transceiver capabilities, virtual reality (VR) terminal, augmented reality (AR) terminal, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical care, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc. The embodiments of this application do not limit the application scenarios. User terminals may also be referred to as terminals, access terminals, UE units, UE stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, UE terminals, wireless communication devices, UE agents, or UE devices, etc. The embodiments in this application are not limited to these terms.

[0053] The second communication node can be understood as a network node on the source side. Furthermore, in the case of a network handover from the SA5G network to the EN-DC network, the second communication node can be understood as a 5G base station in the SA 5G network. In the case of a network handover from the EN-DC network to the SA 5G network, the second communication node can be understood as the main base station in the EN-DC network.

[0054] In one exemplary implementation, the first message is an RRC reconfiguration message, or the first message is a radio control message.

[0055] In one exemplary implementation, the radio 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.

[0056] In one exemplary implementation, the original cell retention indication information is used to indicate that after network handover, some or all of the original cell's radio resources are retained.

[0057] In one exemplary implementation, based on the relationship between the secondary cell information and the original cell information, after network handover, some or all of the original cell's radio resources are retained.

[0058] In one exemplary implementation, the secondary cell information is either a single secondary cell or a list of secondary cells.

[0059] In one exemplary implementation, the NAS resource retention indication is used to indicate that after network handover, some or all of the original cell's NAS resources are retained, wherein some or all of the NAS resources include one or more of the following: UE registration status, TAU information, integrity and encryption information.

[0060] In one exemplary implementation, the suspension instruction is used to indicate that after a network switch, some or all of the original cell's radio resources are retained.

[0061] In one exemplary implementation, the partial or complete wireless resources include: partial or complete wireless connections, wherein the wireless connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

[0062] In one exemplary embodiment, the partial or all of the wireless resources include: partial or all of the wireless configuration, wherein the wireless configuration includes 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.

[0063] In one exemplary implementation, the retained PDU session information is used to indicate that the PDU session is retained after a network handover.

[0064] In one exemplary implementation, the retained PDU session information 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.

[0065] In one exemplary implementation, the QoS flow retention information is used to indicate whether QoS flow or QoS flow information is retained after a network handover.

[0066] In one exemplary implementation, reserving some or all of the wireless resources includes:

[0067] Continue to use the downlink bandwidth portion of the BWP;

[0068] Receive downlink data sent by PDSCH according to the RIV indication information in the downlink control information (DCI).

[0069] In one exemplary implementation, if the following conditions are met but

[0070] If not satisfied but

[0071] Among them, L CRBS The length of the continuous RB, This represents the number of downlink bandwidth RBs.

[0072] In one exemplary implementation, reserving some or all of the wireless resources includes:

[0073] The UE's C-RNTI is retained, wherein the UE's C-RNTI is used for DCI reception information.

[0074] In one exemplary implementation, reserving some or all of the wireless resources includes:

[0075] Retain the resource allocation method for the uplink control channel PUCCH; and / or,

[0076] The set of allocated PUCCH resources.

[0077] In one exemplary implementation, reserving some or all of the wireless resources includes:

[0078] Retain one or more data radio bearers (DRBs);

[0079] Retain one or more signaling radio bearers (SRBs);

[0080] Change one of SRB1 or SRB2 to SRB3.

[0081] In one exemplary implementation, reserving some or all of the wireless resources includes:

[0082] Continue using the existing PDU session for data transmission;

[0083] Alternatively, after the first communication node initiates a PDU session, the data connection can be rebuilt and restored.

[0084] In one exemplary implementation, reserving some or all of the wireless resources includes:

[0085] Use the security context before the switch.

[0086] In one exemplary implementation, reserving some or all of the radio resources includes reserving the DCCH channel.

[0087] In one exemplary implementation, reserving the DCCH channel includes:

[0088] Continue to send and receive data according to the DCCH channel.

[0089] In one exemplary implementation, retaining some or all of the radio resources includes retaining some or all of the QoS streams or QoS stream information.

[0090] In one exemplary implementation, retaining QoS streams or QoS stream information includes:

[0091] Continue to use the QoS stream and / or QoS stream information for user plane data transmission and / or reception.

[0092] In one exemplary embodiment, this application provides a network switching method. Figure 3a This is a flowchart illustrating a network handover method provided in an embodiment of this application. This method is applicable to situations where the UE continues to use its original radio resources before and after a network handover. This method can be executed by the network handover device provided in this application, which can be implemented in software and / or hardware, and the method is applied to a second communication node.

[0093] like Figure 3a As shown, the network switching method provided in this application embodiment mainly includes step S21.

[0094] S21. Send a first message to the first communication node, wherein the first message carries radio resource indication information, and the radio resource indication information is used to indicate that some or all of the radio resources of the original cell are retained after the network handover.

[0095] In one exemplary implementation, the second communication node is a source network node.

[0096] In one exemplary implementation, the first message is an RRC reconfiguration message, or the first message is a radio control message.

[0097] In one exemplary implementation, the radio 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.

[0098] In one exemplary implementation, the original cell retention indication information is used to indicate that after network handover, some or all of the original cell's radio resources are retained.

[0099] In one exemplary implementation, based on the relationship between the secondary cell information and the original cell information, after network handover, some or all of the original cell's radio resources are retained.

[0100] In one exemplary implementation, the secondary cell information is either a single secondary cell or a list of secondary cells.

[0101] In one exemplary implementation, the NAS resource retention indication is used to indicate that after network handover, some or all of the original cell's NAS resources are retained, wherein some or all of the NAS resources include one or more of the following: UE registration status, TAU information, integrity and encryption information.

[0102] In one exemplary implementation, the suspension instruction is used to indicate that after a network switch, some or all of the original cell's radio resources are retained.

[0103] In one exemplary implementation, the partial or complete wireless resources include: partial or complete wireless connections, wherein the wireless connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

[0104] In one exemplary embodiment, the partial or all of the wireless resources include: partial or all of the wireless configuration, wherein the wireless configuration includes 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.

[0105] In one exemplary implementation, the retained PDU session information is used to indicate that the PDU session is retained after a network handover.

[0106] In one exemplary implementation, the retained PDU session information 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.

[0107] In one exemplary implementation, the QoS flow retention information is used to indicate whether QoS flow or QoS flow information is retained after a network handover.

[0108] In one application implementation, Figure 4 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes when a terminal initiates a voice call.

[0109] This embodiment describes the operation between the terminal and the target RAN node and the original network RAN ​​node in the above embodiment. This embodiment involves three network nodes: network node 1 is the UE; network node 2 is the network node NR g-NB where the UE is currently camped; and network node 3 is the E-UTRA e-NB of the target network RAN ​​network node that the UE is switching to.

[0110] S401. A UE in RRC connection state initiates an IMS voice call service to its original network RAN ​​node GNB.

[0111] S402. After the CN discovers that the current 5GS does not support IMS voice service, the GNB sends a MobilityFromNRCommand message from the NR to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains auxiliary cell or cell group information (NR).

[0112] S403. The terminal initiates a handover to the E-UTRA based on its MobilityFromNRCommand. If the terminal finds that its 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's cell network node ENB, it retains some or all of the radio connection, or some or all of the radio configuration, or some or all of the PDU SEESION with the original network node NGB.

[0113] S404, The ENDC network transmits data through the reserved portion of wireless connections or wireless configurations or the reserved portion or all of the PDU SESSIONs.

[0114] Wherein, after receiving the MobilityFromNRCommand message carrying 0 to multiple secondary cells or cell groups, if one of the cell or cell group information is consistent with the cell or cell group information of the original cell or uses the same network node GNB, the UE does not initiate a request for radio configuration or radio connection establishment with the network node GNB of the secondary cell or cell group.

[0115] Upon receiving the MobilityFromNRCommand message, if one of the cell or cell group information is consistent with the cell or cell group information of the original cell or uses the same network node GNB, the UE retains part or all of the radio configuration or part or all of the radio connection with the original cell's S-MN network node GNB.

[0116] Wherein, after receiving the MobilityFromNRCommand message from the primary cell or cell group, if the information of one of the cells or cell groups is consistent with the information of the original cell or cell group or uses the same network node GNB, the UE retains some or all of the radio resources of the network node GNB of the original cell S-MN.

[0117] The partial or complete connections include: RRC connections; partial or complete SRBs; and partial or complete DRBs.

[0118] The radio resources mentioned herein include: L1 physical layer resources, MAC resources, SRB, DRB, PDCP entity, and SDAP entity.

[0119] The wireless configuration includes: part or all of the L1 physical layer configuration, part or all of the MAC layer configuration, part or all of the RLC layer configuration, part or all of the RRC layer configuration, part or all of the PDCP layer configuration, and part or all of the NAS configuration.

[0120] The step S801, which initiates a voice call service, includes the following processing:

[0121] The terminal sends an invite message to the IMS server via GNB. The IMS server sends a 100 trying message to the UE via GNB. The UE sends a 183 Session Progress message to the IMS server via GNB. The IMS server sends a PRACK message to the UE. The UE sends a 200 OK message to the IMS server.

[0122] The retention of some or all physical layer configurations includes: the UE continuing to use the downlink BWP and receiving downlink data sent by the PDSCH according to the RIV indication information in the DCI.

[0123] Furthermore, the RIV value is:

[0124] If satisfied but

[0125] If not satisfied but Among them, L CRBS The length of the continuous RB, This represents the number of downlink bandwidth RBs.

[0126] The reserved portion or all of the physical layer configuration includes: reserving the UE's C-RNTI for DCI information reception.

[0127] The reserved portion or all of the physical layer configuration includes: the reserved uplink control channel (PUCCH) resource allocation method and / or the allocated PUCCH resource set.

[0128] The retention of some or all wireless connections includes: retaining one or more DRBs (Data Radio Bearers).

[0129] The retention of some or all wireless connections includes: retaining one or more SRBs (Signaling Radio Bearers).

[0130] The retention of some or all wireless connections includes: modifying one of SRB1 or SRB2 to SRB3.

[0131] The retention of some or all NAS configurations includes retaining the UE's registration status, and / or TAU information, and / or integrity and encryption information.

[0132] After the UE completes the handover, it continues to use the original PDU SESSION for data transmission; or it initiates the reconstruction of the PDN connection at the E-sgNB to restore the data connection.

[0133] After the UE completes the handover, it continues to use the original PDU SESSION for data transmission; or it initiates the reconstruction of the PDU SESSION at the E-sgNB to restore the data connection.

[0134] In one application implementation, Figure 5 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes, when a terminal initiates a voice call. This embodiment involves three network nodes: network node 1 is the UE; network node 2 is the NR g-NB where the UE is currently camped; and network node 3 is the E-UTRA e-NB of the target network for the UE's switch.

[0135] S501. The UE in RRC connection state initiates an IMS voice call service to its GNB.

[0136] S502. After the CN discovers that the current 5GS does not support IMS voice service, the ENB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains indication information to retain the original NR cell.

[0137] S503. The terminal initiates a handover to the E-UTRA based on its MobilityFromNRCommand; after completing the cell handover to the E-UTRA, it retains part or all of the original NR cell's radio connection or radio configuration, or retains part or all of the PDU SESSION.

[0138] The aforementioned partial or complete connections include: RRC connections; and related SRBs and DRBs.

[0139] The radio resources mentioned therein include: L1 physical layer resources, MAC resources, SRB, DRB, PDCP entities, and SDAP entities.

[0140] The wireless configuration includes: part or all of the L1 physical layer configuration, part or all of the MAC layer configuration, part or all of the RLC layer configuration, part or all of the RRC layer configuration, part or all of the PDCP layer configuration, and part or all of the NAS configuration.

[0141] S504, The ENDC network transmits data through the reserved portion or all of the wireless connections, wireless configurations, or PDU SESSIONs.

[0142] In one applicable implementation, Figure 6 This application provides a flowchart of a method for a terminal to switch between 4G and 5G, and 5G SA / NSA modes. This embodiment involves three network nodes: network node 1 is the UE; network node 2 is the NR g-NB where the UE is currently camped; and network node 3 is the E-UTRA e-NB of the target network for the UE to switch to.

[0143] S601. The UE in RRC connection state sends a measurement report to its GNB.

[0144] S602, GNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains the T-MN information (M-ENB) of E-UTRA, as well as the indication information to retain the original NR cell.

[0145] S603. The terminal initiates a handover to E-UTRA based on its MobilityFromNRCommand; after completing the cell handover to the E-UTRA, it retains part or all of the original NR cell's radio bearer.

[0146] The retention of some or all of the original cell's radio bearers includes: retaining some or all of the original physical layer resource configurations; retaining some or all of the SDAP or PDCP entities in SRB1, SRB2, and DRB; retaining all or some of the PDU sessions in the NR network; and initiating corresponding PDNCONNECTION connection reconstruction in the EN-DC network for all or some of the PDU sessions.

[0147] S604, the ENB schedules the UE to transmit control signaling or data through the reserved portion of SRB, DRB, or PDUSESSION according to network requirements.

[0148] In one applicable implementation, Figure 7 This application provides a flowchart of a method for a terminal to switch between 4G and 5G, and 5G SA / NSA modes. This embodiment involves three network nodes: network node 1 is the UE; network node 2 is the NR g-NB where the UE is currently camped; and network node 3 is the E-UTRA e-NB of the target network for the UE to switch to.

[0149] S701. The UE in RRC connected state sends a measurement report to its GNB.

[0150] S702, ENB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; the MobilityFromNRCommand message contains the E-UTRA's T-MN information (M-ENB) and T-SN information (GNB).

[0151] S703. The terminal initiates a handover to the E-UTRA based on its MobilityFromNRCommand; after completing the cell handover to the E-UTRA; if the T-SN is the original NR cell; retain some or all of the original NR cell's radio bearers. Retaining some or all of the original cell's radio bearers includes: retaining some or all of the original physical layer resource configurations, or retaining some or all of the SDAP or PDCP entities in SRB1, SRB2, and DRB; retaining all or some of the PDU sessions in the NR network; and initiating the reconstruction of the corresponding PDNCONNECTION in the EN-DC network for all or some of the PDU sessions.

[0152] S704. The ENB schedules the UE to transmit control signaling or data through the reserved portion of SRB, DRB, or PDUSESSION according to network requirements.

[0153] In one applicable implementation, Figure 8 This application provides a flowchart of a method for switching between 4G and 5G, and 5G SA / NSA modes, when a terminal makes a voice call to the called party. This embodiment involves three network nodes: network node 1 is the UE; network node 2 is the NR g-NB where the UE is currently camped; and network node 3 is the E-UTRA e-NB of the target network that the UE is switching to.

[0154] S801 and CN attempt to initiate an IMS called voice call service for a UE in connected state. After discovering that 5GS does not support IMSVOICE service, ENB sends a MobilityFromNRCommand message to notify the connected UE to switch to the EN-DC network. The MobilityFromNRCommand message contains the T-MN information (M-ENB) of E-UTRA and the T-SN information.

[0155] S802, the terminal initiates a handover to E-UTRA based on its MobilityFromNRCommand; and sends an RRCRECONFIGURATION message to the ENB.

[0156] If the terminal discovers that its T-SN information is an NR cell, after completing the cell handover to the E-UTRA, it retains some or all of the original NR cell's radio resources. Retaining some or all of the original cell's radio resources includes one of the following: retaining some or all of the original physical layer (L1) resource configurations; retaining some or all of the SDAP or PDCP entities in SRB1, SRB2, and DRB; retaining all or some PDU sessions in the NR network; and not initiating corresponding PDN CONNECTION connection reconstruction in the EN-DC network for all or some PDU sessions.

[0157] S803, the EN-DC network transmits control signaling or data through the reserved portion of SRB, DRB, or PDU SESSION.

[0158] In one applicable implementation, Figure 9 This application provides a flowchart of a method for a terminal to perform network handover based on the current network measurement report. The UE is in a connected state connected to the EN-DC 5G network, and the terminal and the NR node GNB are conducting EMMB service. According to the current network measurement report, the network side finds that the UE needs to perform a handover to the MN cell. In order to ensure the continuity of EMMB service, especially the continuity of PDUSESSION data, the specific handover process is as follows:

[0159] S901, 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.

[0160] S902, the UE receives the RRCConnectionReconfiguration and initiates a handover to the target EN-DC cell specified in the RRCConnectionReconfiguration, and sends an RRCConnectionReconfigurationComplete message to the target cell E-NB to complete the handover from the NR cell to the EN-DC cell. The UE decides whether to retain all or part of the current UE's PDU session with the original cell (S-MN, GNB) based on the secondary cell or cell group in the RRCConnectionReconfiguration. If the primary cell or cell group and 0 to more secondary cells or cell groups are consistent with the original cell or cell group, then some or all of the current UE's PDU session with the original cell (S-MN, GNB) is retained.

[0161] Specifically, 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 SESSIONID and / or IP address and / or APN information; and a new PDU SESSION is established.

[0162] The UE receives and / or sends data through a portion or all of the reserved PDU sessions.

[0163] In one applicable implementation, Figure 10 This application provides a flowchart of a method for a terminal to perform network switching based on the measurement report of the current network. The UE was originally connected to the SA 5G network and was performing MBB service. At this time, it needs to perform voice service (such as answering a voice call or initiating a voice call), but the 5G network does not support voice service. The UE needs to switch to the LTE network to establish VoLTE service (Voice based on LTE). The UE needs to continue the original MBB service, so the UE switches to the EN-DC network, establishes a VoLTE connection on the LTE RAN node, and establishes the original MBB service connection on the NG-RAN node.

[0164] The UE connects to the original SA 5G network's 5G base station (S-gNB), also known as the original node (S-node). In the target EN-DC network the UE switches to, the T-MN (Target Master node) is the LTE eNB, also known as the MeNB (Master eNB), and the T-SN (Target Secondary node) is the 5G base station, also known as the NG-RAN node. When the target NG-RAN node is the original NR node, the specific handover process is as follows:

[0165] S1001, GNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; wherein the MobilityFromNRCommand message contains an indication to retain the original cell (i.e. the original NR cell);

[0166] S1002, upon receiving the MobilityFromNRCommand, the UE initiates a handover to the target EN-DC cell and sends an RRCConnectionReconfigurationComplete message to the target cell E-NB to complete the handover from the NR cell to the EN-DC cell. The UE decides whether to retain all or part of the PDU sessions between the current UE and the original cell or cell group (S-MN, GNB) based on the indication in the MobilityFromNRCommand to retain the original cell. If the indication is to retain the original cell, then part or all of the current UE's PDU sessions with the original cell's secondary node S-SN are retained.

[0167] The S1003 and EN-DC networks continue to communicate via the retained PDU SESSION.

[0168] When the UE receives the MobilityFromNRCommand message carrying the T-MN and indication information for retaining the original cell, if the indication information is to retain the original cell, then the UE will not initiate a reconstruction of the PDU SESSION for the retained original cell.

[0169] Specifically, 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 SESSIONID and / or IP address and / or APN information; and a new PDU SESSION is established.

[0170] In one applicable implementation, Figure 11This application provides a flowchart of a method for a terminal to perform network handover based on the current network measurement report. The UE is in a connected state connected to the EN-DC 5G network, and the terminal and the NR node GNB are conducting EMMB service. According to the current network measurement report, the network side discovers that the UE needs to perform a handover to the MN cell. In order to ensure the continuity of the EMMB service, the network wants to maintain the current radio configuration or radio connection of the SN cell.

[0171] The specific switching process is as follows:

[0172] S1101, ENB sends an RRCConnectionReconfiguration message to notify the UE to switch to another EN-DC network; wherein the RRCConnectionReconfiguration message contains secondary cell or cell group reservation indication information.

[0173] S1102. Upon receiving the RRCConnectionReconfiguration, the UE initiates a handover to the target EN-DC cell and sends an RRCConnectionReconfigurationComplete message to the target cell E-NB to complete the handover from the NR cell to the EN-DC cell. The UE determines whether to retain the current UE's radio configuration or radio connection with the original secondary cell or cell group based on the secondary cell or cell group retention indication information in the RRCConnectionReconfiguration. If the indication is to retain the secondary cell, then some or all of the UE's radio configuration or radio connection with the original secondary cell or cell group will be retained.

[0174] S1103, the EN-DC network communicates with the UE through the T-MN and some or all of the radio configurations or radio connections reserved by the primary and secondary cells or cell groups.

[0175] Wherein, after receiving the RRCConnectionReconfiguration message carrying T-MN secondary cell retention indication information, if the indication information indicates that the secondary cell is to be retained, the UE does not initiate a radio configuration or radio connection update or reconstruction that is consistent with the information of the original secondary cell or cell group or uses the same network node or cell lease of the secondary cell or cell lease.

[0176] Wherein, after receiving the RRCConnectionReconfiguration message carrying the T-MN secondary cell reservation indication information, if the indication information indicates that the secondary cell is reserved, the UE reserves some or all of the radio resources of the original secondary cell or cell group.

[0177] The radio resources mentioned therein include: L1 physical layer resources, MAC resources, SRB, DRB, PDCP entities, and SDAP entities.

[0178] The wireless configuration includes: part or all of the L1 physical layer configuration, part or all of the MAC layer configuration, part or all of the RLC layer configuration, part or all of the RRC layer configuration, part or all of the PDCP layer configuration, and part or all of the NAS configuration.

[0179] In one applicable implementation, Figure 12 This application provides a flowchart of a method for a terminal to perform network switching based on the measurement report of the current network. The UE was originally connected to the SA 5G network and was performing MBB service. At this time, it needs to perform voice service (such as answering a voice call or initiating a voice call), but the 5G network does not support voice service. The UE needs to switch to the LTE network to establish VoLTE service (Voice based on LTE). The UE needs to continue the original MBB service, so the UE switches to the EN-DC network, establishes a VoLTE connection on the LTE RAN node, and establishes the original MBB service connection on the NG-RAN node.

[0180] In an NR network, UE data communication requires establishing a PDU session with the network. During network handover, to maintain data continuity, the UE typically releases its current PDU session and establishes a new PDU session or SDP connection in the target cell. This reconstruction of the PDU session or SDP connection briefly interrupts terminal data transmission. To ensure higher data continuity, when the RAN node or cell of the target cell's T-SN is the same as the current cell's S-MN, the procedure is as follows:

[0181] S1201 The GNB sends a MobilityFromNRCommand message to notify the UE to switch to the EN-DC network; wherein the MobilityFromNRCommand message contains a PDU session reservation indication;

[0182] S1202 Upon receiving the MobilityFromNRCommand, the UE initiates a 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 sessions between the current UE and the original cell or cell group (S-MN, GNB) based on the PDU retention indication information in the MobilityFromNRCommand. If the indication information indicates retention of the original cell, then the UE retains part or all of the PDU sessions between the current UE and the original cell or cell leased (S-MN, GNB).

[0183] The S1203 EN-DC network continues to communicate via the retained PDU SESSION.

[0184] When the UE receives the MobilityFromNRCommand message carrying the indication information of T-MN and reserved PDU session, if the indication information is a reserved PDU, then the UE will not initiate a reconstruction of the PDU session for the reserved original cell.

[0185] The PDU session retention information can be an indication of PDU session retention or a list of PDU session information that needs to be retained.

[0186] As stated above, 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 SESSIONID and / or IP address and / or APN information; a new PDU SESSION is established.

[0187] In one application implementation, this embodiment provides a UE that supports handover between different networks, including the following operations:

[0188] The UE receives a MobilityFromNRCommand message from the NR, which contains original cell retention indication information, or cell or cell group information;

[0189] The UE decides whether to retain all or part of the PDU SESSION in the original network based on the original cell retention indication information or the relationship between the cell or cell group information and the original cell or cell group.

[0190] The UE continues to communicate via the retained PDU SESSION.

[0191] As stated above, 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 SESSIONID and / or IP address and / or APN information; a new PDU SESSION is established.

[0192] In one application implementation, this embodiment provides a UE that supports handover between different networks, including the following operations:

[0193] The UE receives a MobilityFromNRCommand message from the NR, which contains reserved PDU SESSION information.

[0194] The UE decides whether to retain all or part of the PDU SESSION from the original network based on the aforementioned retained PDU SESSION information.

[0195] The UE continues to communicate via the retained PDU SESSION.

[0196] As stated above, 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 SESSIONID and / or IP address and / or APN information; a new PDU SESSION is established.

[0197] The PDU SESSION information to be retained can be: an instruction to retain a PDU SESSION; or a list of PDU SESSION information to be retained; the PDU SESSION information list contains information on at least one PDU SESSION.

[0198] In one practical implementation, a network node (source node) that supports handover between different networks is described as follows:

[0199] Send a MobilityFromNRCommand or RRCCONNECTION RECONFIGURATION message, which contains original cell retention indication information, or cell or cell group information; or PDU retention information or DRB retention information.

[0200] The cell retention indication information is used to instruct the terminal to retain all or part of the original cell's wireless connection or wireless configuration after handover.

[0201] The cell or cell information can be used to instruct the terminal to retain all or part of the original cell's wireless connection or wireless configuration after a handover.

[0202] The cell retention instruction information can be used to instruct the terminal to retain all or part of the original cell's wireless connection or wireless configuration after handover.

[0203] The DRB retention information is used to indicate whether some or all of the DRBs are retained after the terminal cell handover.

[0204] The cell or cell information can be used to instruct the terminal to retain all or part of the original cell's radio resource configuration, radio connection, or PDU SEESSION after handover.

[0205] The PDU session retention information is used to instruct the terminal to retain all or part of the original cell's radio resource configuration, or all or part of the radio connection, or all or part of the PDU session.

[0206] In one application implementation, a network node (target network core network element) that supports handover between different networks is described below:

[0207] After receiving the RRCCONNECTION RECONFIGURATION message from the terminal that has reserved part or all of the original cell's wireless connection or wireless resources;

[0208] The network communicates data via a reserved portion or all of a wireless link or wireless configuration.

[0209] In one application implementation, a network node (target network core network element) that supports handover between different networks is described below:

[0210] After receiving the RRCCONNECTION RECONFIGURATION message from the terminal that retained the PDU SESSION;

[0211] The network communicates data through a reserved portion or all of the PDU SESSION.

[0212] In one embodiment, this application provides a network switching device. Figure 13 This is a schematic diagram of a network handover device provided in an embodiment of this application. The method is applicable to situations where the UE continues to use its original radio resources before and after a network handover. The network handover device can be implemented in software and / or hardware, and the method is applied to a first communication node.

[0213] like Figure 13 As shown, the network switching device provided in this application embodiment mainly includes a receiving module 131 and a holding module 132.

[0214] The receiving module 131 is configured to receive a first message, wherein the first message carries radio resource indication information;

[0215] The retention module 132 is configured to retain some or all of the original cell's radio resources based on radio resource indication information.

[0216] In one exemplary implementation, the first message is sent by the first communication node.

[0217] In one exemplary implementation, the first message is an RRC reconfiguration message, or the first message is a radio control message.

[0218] In one exemplary implementation, the radio 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.

[0219] In one exemplary implementation, the original cell retention indication information is used to indicate that after network handover, some or all of the original cell's radio resources are retained.

[0220] In one exemplary implementation, based on the relationship between the secondary cell information and the original cell information, after network handover, some or all of the original cell's radio resources are retained.

[0221] In one exemplary implementation, the secondary cell information is either a single secondary cell or a list of secondary cells.

[0222] In one exemplary implementation, the NAS resource retention indication is used to indicate that after network handover, some or all of the original cell's NAS resources are retained, wherein some or all of the NAS resources include one or more of the following: UE registration status, TAU information, integrity and encryption information.

[0223] In one exemplary implementation, the suspension instruction is used to indicate that after a network switch, some or all of the original cell's radio resources are retained.

[0224] In one exemplary implementation, the partial or complete wireless resources include: partial or complete wireless connections, wherein the wireless connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

[0225] In one exemplary embodiment, the partial or all of the wireless resources include: partial or all of the wireless configuration, wherein the wireless configuration includes 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.

[0226] In one exemplary implementation, the retained PDU session information is used to indicate that the PDU session is retained after a network handover.

[0227] In one exemplary implementation, the retained PDU session information 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.

[0228] In one exemplary implementation, the QoS flow retention information is used to indicate whether QoS flow or QoS flow information is retained after a network handover.

[0229] In one exemplary implementation, the retention module 132 is configured to continue using the downlink bandwidth portion (BWP) and receive downlink data transmitted by the PDSCH according to the RIV indication information in the downlink control information (DCI).

[0230] In one exemplary implementation, if the following conditions are met but

[0231] If not satisfied but

[0232] Among them, L CRBS The length of the continuous RB, This represents the number of downlink bandwidth RBs.

[0233] In one exemplary implementation, the retention module 132 is configured to retain the UE's C-RNTI, wherein the UE's C-RNTI is used for DCI reception information.

[0234] In one exemplary implementation, the reservation module 132 is configured to reserve the resource allocation method of the uplink control channel PUCCH; and / or the allocated PUCCH resource set.

[0235] In one exemplary embodiment, the retention module 132 is configured to retain one or more data radio bearers (DRBs); retain one or more signaling radio bearers (SRBs); and modify one of the SRBs, SRB1 or SRB2, to SRB3.

[0236] In one exemplary implementation, the retention module 132 is configured to continue using the existing PDU session for data transmission; or, after the first communication node initiates a PDU session, to rebuild and restore the data connection.

[0237] In one exemplary implementation, the retention module 132 is configured to use the security context prior to the switch.

[0238] In one exemplary embodiment, the reservation module 132 is configured to reserve the DCCH channel.

[0239] In one exemplary implementation, retaining the DCCH channel includes continuing to send and receive data according to the DCCH channel.

[0240] In one exemplary embodiment, the retention module 132 is configured to retain some or all of the QoS stream or QoS stream information.

[0241] In one exemplary implementation, retaining the QoS stream or QoS stream information includes: continuing to use the QoS stream and / or QoS stream information for user plane data transmission and / or reception.

[0242] The network switching device provided in this embodiment can execute the network switching method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method. Technical details not described in detail in this embodiment can be found in the network switching method provided in any embodiment of the present invention.

[0243] It is worth noting that in the embodiments of the network switching device described above, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of this application.

[0244] In one exemplary embodiment, this application provides a network switching device. Figure 13a This is a schematic diagram of a network handover device provided in an embodiment of this application. This device is applicable to situations where the UE continues to use its original radio resources before and after a network handover. The network handover device can be implemented in software and / or hardware, and is configured in a second communication node.

[0245] like Figure 13a As shown, the network switching device provided in this application embodiment mainly includes a sending module 1301.

[0246] The sending module 1301 is configured to send a first message to the first communication node. The first message carries radio resource indication information, which is used to indicate that some or all of the radio resources of the original cell are retained after network handover.

[0247] In one exemplary implementation, the second communication node is a source network node.

[0248] In one exemplary implementation, the first message is an RRC reconfiguration message, or the first message is a radio control message.

[0249] In one exemplary implementation, the radio 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.

[0250] In one exemplary implementation, the original cell retention indication information is used to indicate that after network handover, some or all of the original cell's radio resources are retained.

[0251] In one exemplary implementation, based on the relationship between the secondary cell information and the original cell information, after network handover, some or all of the original cell's radio resources are retained.

[0252] In one exemplary implementation, the secondary cell information is either a single secondary cell or a list of secondary cells.

[0253] In one exemplary implementation, the NAS resource retention indication is used to indicate that after network handover, some or all of the original cell's NAS resources are retained, wherein some or all of the NAS resources include one or more of the following: UE registration status, TAU information, integrity and encryption information.

[0254] In one exemplary implementation, the suspension instruction is used to indicate that after a network switch, some or all of the original cell's radio resources are retained.

[0255] In one exemplary implementation, the partial or complete wireless resources include: partial or complete wireless connections, wherein the wireless connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

[0256] In one exemplary embodiment, the partial or all of the wireless resources include: partial or all of the wireless configuration, wherein the wireless configuration includes 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.

[0257] In one exemplary implementation, the retained PDU session information is used to indicate that the PDU session is retained after a network handover.

[0258] In one exemplary implementation, the retained PDU session information 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.

[0259] In one exemplary implementation, the QoS flow retention information is used to indicate whether QoS flow or QoS flow information is retained after a network handover.

[0260] The network switching device provided in this embodiment can execute the network switching method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects of executing the method. Technical details not described in detail in this embodiment can be found in the network switching method provided in any embodiment of the present invention.

[0261] It is worth noting that in the embodiments of the network switching device described above, the various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy differentiation and are not used to limit the scope of protection of this application.

[0262] This application also provides a device. Figure 14 This is a schematic diagram of the structure of a device provided in an embodiment of this application, such as... Figure 14 As shown, the device includes a processor 141, a memory 142, an input device 143, an output device 144, and a communication device 145; the number of processors 141 in the device can be one or more. Figure 14 Taking a processor 141 as an example; the processor 141, memory 142, input device 143, and output device 144 in the device can be connected via a bus or other means. Figure 14 Taking the example of a connection between China and Israel via a bus.

[0263] The memory 142, as a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the network switching method in the embodiments of this application (e.g., the receiving module 131 and the holding module 132 in the network switching device). Another example is the program instructions / modules corresponding to the network switching method in the embodiments of this application (e.g., the sending module 1301 in the network switching device). The processor 141 executes various functional applications and data processing of the device by running the software programs, instructions, and modules stored in the memory 142, thereby implementing any of the methods provided in the embodiments of this application.

[0264] Memory 142 may primarily include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on device usage. Furthermore, memory 142 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state storage device. In some instances, memory 142 may further include memory remotely located relative to processor 141, which can be connected to the device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0265] Input device 143 can be used to receive input digital or character information, and to generate key signal inputs related to user settings and function control of the device. Output device 144 may include display devices such as a display screen.

[0266] The communication device 145 may include a receiver and a transmitter. The communication device 145 is configured to perform information transmission and reception communication under the control of the processor 141.

[0267] This application embodiment also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a network handover method. The method is applied to a first communication node, and the method includes:

[0268] Receive a first message, wherein the first message carries radio resource indication information;

[0269] Based on the radio resource indication information, some or all of the original cell's radio resources are retained.

[0270] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the release method operation described above, but can also perform related operations in the network switching method provided in any embodiment of this application.

[0271] This application embodiment also provides a storage medium containing computer-executable instructions, which, when executed by a computer processor, are used to perform a network handover method applied to a second communication node, the method comprising:

[0272] A first message is sent to the first communication node, wherein the first message carries radio resource indication information, which is used to indicate that some or all of the radio resources of the original cell are retained after the network handover.

[0273] Of course, the computer-executable instructions provided in the embodiments of this application are not limited to the release method operation described above, but can also perform related operations in the network switching method provided in any embodiment of this application.

[0274] Based on the above description of the implementation methods, those skilled in the art can clearly understand that this application can be implemented using software and necessary general-purpose hardware, and of course, it can also be implemented using hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory, hard disk, or optical disk, etc., including several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0275] The above description is merely an exemplary embodiment of this application and is not intended to limit the scope of protection of this application.

[0276] Those skilled in the art will understand that the term user terminal encompasses any suitable type of wireless user equipment, such as mobile phones, portable data processing devices, portable web browsers, or vehicle-mounted mobile stations.

[0277] Generally, the various embodiments of this application can be implemented in hardware or dedicated circuitry, software, logic, or any combination thereof. For example, some aspects can be implemented in hardware, while others can be implemented in firmware or software that can be executed by a controller, microprocessor, or other computing device, although this application is not limited thereto.

[0278] Embodiments of this application can be implemented by executing computer program instructions through the data processor of a mobile device, for example, in a processor entity, or through hardware, or through a combination of software and hardware. The computer program instructions can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages.

[0279] Any block diagram of logical flow in the accompanying drawings of this application may represent program steps, or may represent interconnected logic circuits, modules, and functions, or may represent a combination of program steps and logic circuits, modules, and functions. The computer program may be stored in memory. The memory may be of any type suitable to the local technical environment and may be implemented using any suitable data storage technology, such as, but not limited to, read-only memory (ROM), random access memory (RAM), optical storage devices and systems (Digital Multifunction Discs, DVDs, or CDs), etc. Computer-readable media may include non-transitory storage media. The data processor may be of any type suitable to the local technical environment, such as, but not limited to, general-purpose computers, special-purpose computers, microprocessors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable logic devices (FGPAs), and processors based on multi-core processor architectures.

[0280] A detailed description of exemplary embodiments of this application has been provided above through exemplary and non-limiting examples. However, various modifications and adjustments to the above embodiments will be apparent to those skilled in the art when considered in conjunction with the accompanying drawings and claims, without departing from the scope of the invention. Therefore, the proper scope of the invention will be determined by the claims.

Claims

1. A network handover method, characterized in that, The method is applied to a first communication node, wherein the first communication node is a user terminal in the network, and includes: Receive a first message, wherein the first message carries radio resource indication information; According to the radio resource indication information, after the network handover is completed, some or all of the radio resources of the original cell are retained so that the user terminal after the handover can continue to use some or all of the radio resources of the original cell; wherein, in the case of the network handover from SA 5G network to EN-DC network, the secondary base station in the EN-DC network after the user terminal handover is the same 5G base station as the 5G base station before the handover; in the case of the network handover from EN-DC network to SA 5G network, the target 5G base station after the user terminal handover is the same 5G base station as the secondary base station in the EN-DC network before the handover. The radio resource indication information includes: secondary cell information, or reserved PDU session information, or suspension indication, or QoS flow reservation information; The suspension indication is used to indicate that after network switching, some or all of the original cell's wireless resources are retained; The method further includes: based on the relationship between secondary cell information and original cell information, retaining some or all of the original cell's radio resources after network handover; wherein the secondary cell information is single secondary cell information or a list of secondary cells.

2. The method according to claim 1, characterized in that, The first message is an RRC reconfiguration message, or the first message is a radio control message.

3. The method according to claim 1, characterized in that, The partial or complete wireless resources include: partial or complete wireless connections, wherein the wireless connections include at least one of the following: RRC connection, SRB, DRB, PDU session context, NAS layer connection.

4. The method according to claim 1, characterized in that, The partial or complete wireless resources include: partial or complete wireless configurations, wherein the wireless 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.

5. The method according to claim 1, characterized in that, The retained PDU session information is used to indicate that the PDU session is retained after a network handover.

6. The method according to claim 5, characterized in that, The retained PDU session information includes: PDU session retention indication information, or a list of PDU session information to be retained; wherein the PDU session information list includes one or more PDU session information.

7. The method according to claim 1, characterized in that, The QoS flow retention information is used to indicate whether QoS flow or QoS flow information is retained after a network handover.

8. The method according to claim 1, characterized in that, Reserving some or all of the wireless resources includes: Continue to use the downlink bandwidth portion of the BWP; Receive downlink data sent by PDSCH according to the RIV indication information in the downlink control information (DCI).

9. The method according to claim 8, characterized in that, If satisfied ,but ; If not satisfied ,but Among them, L CRBS The length of the continuous RB, N( DL RB () represents the number of downlink bandwidth RBs.

10. The method according to claim 1, characterized in that, Reserving some or all of the wireless resources includes: The UE's C-RNTI is retained, wherein the UE's C-RNTI is used for DCI reception information.

11. The method according to claim 1, characterized in that, Reserving some or all of the wireless resources includes: Retain the resource allocation method for the uplink control channel PUCCH; and / or, The set of allocated PUCCH resources.

12. The method according to claim 1, characterized in that, Reserving some or all of the wireless resources includes: Retain one or more data radio bearers (DRBs); Retain one or more signaling radio bearers (SRBs); Change one of SRB1 or SRB2 to SRB3.

13. The method according to claim 1, characterized in that, Reserving some or all of the wireless resources includes: Continue using the existing PDU session for data transmission; Alternatively, after the first communication node initiates a PDU session, the data connection can be rebuilt and restored.

14. The method according to claim 1, characterized in that, Reserving some or all of the wireless resources includes: Use the security context before the switch.

15. The method according to claim 1, characterized in that, Reserving some or all of the radio resources includes: reserving the DCCH channel.

16. The method according to claim 15, characterized in that, Reserved DCCH channels include: Continue to send and receive data according to the DCCH channel.

17. The method according to claim 1, characterized in that, Retaining some or all of the radio resources includes: retaining some or all of the QoS streams or QoS stream information.

18. The method according to claim 17, characterized in that, Retaining QoS streams or QoS stream information includes: Continue to use the QoS stream and / or QoS stream information for user plane data transmission and / or reception.

19. A network handover method, characterized in that, The method is applied to the second communication node, including: A first message is sent to a first communication node, wherein the first message carries radio resource indication information. The first communication node is a user terminal in the network. The radio resource indication information is used to indicate that some or all of the radio resources of the original cell are retained after the network handover, so that the user terminal after the handover can continue to use some or all of the radio resources of the original cell. In the case of network handover from SA 5G network to EN-DC network, the secondary base station in the EN-DC network after the user terminal handover is the same 5G base station as the 5G base station before the handover. In the case of network handover from EN-DC network to SA 5G network, the target 5G base station after the user terminal handover is the same 5G base station as the secondary base station in the EN-DC network before the handover. The radio resource indication information includes: secondary cell information, or reserved PDU session information, or suspension indication, or QoS flow reservation information; The suspension indication is used to indicate that after network switching, some or all of the original cell's wireless resources are retained; The first communication node is used to: retain some or all of the radio resources of the original cell after network handover, based on the relationship between the secondary cell information and the original cell information; wherein the secondary cell information is a single secondary cell information or a list of secondary cells.

20. The method according to claim 19, characterized in that, The second communication node is the source network node.

21. A network switching device, characterized in that, The device is configured at a first communication node, wherein the first communication node is a user terminal in the network, and includes: The receiving module is configured to receive a first message, wherein the first message carries radio resource indication information; The retention module is configured to retain some or all of the radio resources of the original cell after network handover, based on radio resource indication information, so that the user terminal after handover can continue to use some or all of the radio resources of the original cell; wherein, in the case of network handover from SA 5G network to EN-DC network, the secondary base station in the EN-DC network after handover is the same 5G base station as the 5G base station before handover; in the case of network handover from EN-DC network to SA 5G network, the target 5G base station after handover is the same 5G base station as the secondary base station in the EN-DC network before handover. The radio resource indication information includes: secondary cell information, or reserved PDU session information, or suspension indication, or QoS flow reservation information; The suspension indication is used to indicate that after network switching, some or all of the original cell's wireless resources are retained; The device is further configured to: retain some or all of the radio resources of the original cell after network handover, based on the relationship between the secondary cell information and the original cell information; wherein the secondary cell information is single secondary cell information or a list of secondary cells.

22. A network switching device, characterized in that, The device is configured at the second communication node and includes: The sending module is configured to send a first message to a first communication node, wherein the first message carries radio resource indication information, the first communication node being a user terminal in the network, and the radio resource indication information is used to indicate that some or all of the radio resources of the original cell are retained after network handover, so that the user terminal after handover can continue to use some or all of the radio resources of the original cell; wherein, in the case of network handover from SA 5G network to EN-DC network, the secondary base station in the EN-DC network after handover is the same 5G base station as the 5G base station before handover; in the case of network handover from EN-DC network to SA 5G network, the target 5G base station after handover is the same 5G base station as the secondary base station in the EN-DC network before handover; The radio resource indication information includes: secondary cell information, or reserved PDU session information, or suspension indication, or QoS flow reservation information; The suspension indication is used to indicate that after network switching, some or all of the original cell's wireless resources are retained; The first communication node is used to: retain some or all of the radio resources of the original cell after network handover, based on the relationship between the secondary cell information and the original cell information; wherein the secondary cell information is a single secondary cell information or a list of secondary cells.

23. A computer device, characterized in that, include: One or more processors; Memory, used to store 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 as described in any one of claims 1-20.

24. A storage medium, characterized in that, The storage medium stores a computer program, which, when executed by a processor, implements the method described in any one of claims 1-20.

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