A cell reselection method, device, terminal and network equipment

Abstract

The application provides a cell reselection method, device, terminal and network equipment, wherein the cell reselection method comprises the following steps: receiving system information broadcasted by a network equipment in a target cell; in the case that the terminal is in an idle state, performing cell reselection according to the system information; the terminal is a terminal supporting 4G base station access to 5G core network function; the system information comprises connection priority of different core networks in a 4G system and core network identification indication information; the connection priority of a 5G core network is higher than the connection priority of a 4G core network. The present application solves the problem that the terminal supporting option 5 has long switching time and poor service continuity when performing cell reselection in the idle state in the prior art.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to a cell reselection method, apparatus, terminal, and network equipment. Background Technology

[0002] Currently, based on considerations such as 5G service requirements, introduction time, and construction costs, two technical systems have emerged for 5G architecture: Non-Standalone (NSA) and Standalone (SA). The current standard mainly involves five categories of technical options (such as Opt 2, 3, 4, 5, and the 7 series). Among them, Opt 5 is a 4G base station upgrade to access 5GC (5G core network), and its core network is completely consistent with Opt 2.

[0003] Furthermore, considering the gradual decline in asset utilization of 4G base stations in the long-term evolution of 5G, and that directly evolving from 4G to 5G is not the optimal choice in terms of investment returns, business development, and construction workload, Opt5, a splicing solution between the 4G access layer and the 5G non-access layer, supports network slicing and QoS (Quality of Service) and other 2B services (i.e., industry customer services). The 4G network only requires software upgrades to support these features, providing a cost-effective solution for industry customers. Therefore, the Opt5 solution can be adopted to a certain extent.

[0004] Specifically, to implement the basic Opt5 architecture, 4G base stations need to support the coexistence of Opt1 and Opt5. However, from the system workflow perspective, terminals cannot determine whether neighboring cells are Opt1 or Opt5 (Opt1 connects to the EPC (4G core network), and Opt5 connects to the 5GC), potentially leading to mobility management processes that may involve cross-core network or non-cross-core network operations. However, the mobility management processes for cross-core network and non-cross-core network operations differ. Cross-core network operations result in poor service continuity and a poor user experience; for idle terminals performing cell reselection, this inevitably leads to prolonged handover time, and service continuity cannot be guaranteed.

[0005] As shown above, for terminals that support Option 5 (i.e., support 4G base station access to 5G core network function) in the existing technology, cell reselection in idle state has problems such as prolonged handover time and poor service continuity. Summary of the Invention

[0006] The purpose of this invention is to provide a cell reselection method, apparatus, terminal, and network equipment to solve the problems of prolonged handover time and poor service continuity in the prior art when a terminal supporting option 5 performs cell reselection in the idle state.

[0007] To address the aforementioned technical problems, embodiments of the present invention provide a cell reselection method, applied to a terminal, comprising:

[0008] Receive system information broadcast by network devices within the target cell;

[0009] When the terminal is in an idle state, cell reselection is performed based on the system information;

[0010] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0011] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0012] Optionally, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field;

[0013] The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band.

[0014] The options include: Option 1 and / or Option 5;

[0015] Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

[0016] Optionally, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0017] Optionally, the core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or,

[0018] The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information;

[0019] The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

[0020] Optionally, if the value information indicates that the newly added bit takes the first value, the core network identifier information of the neighboring cell corresponding to the value information is the 5G core network identifier information; otherwise, the core network identifier information of the neighboring cell corresponding to the value information is other core network identifier information.

[0021] Among them, the other core network identification information includes: 4G core network identification information.

[0022] Optionally, the core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0023] This invention also provides a cell reselection method, applied to network devices, including:

[0024] Broadcast system information to terminals within the target cell;

[0025] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0026] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0027] Optionally, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field;

[0028] The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band.

[0029] The options include: Option 1 and / or Option 5;

[0030] Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

[0031] Optionally, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0032] Optionally, the core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or,

[0033] The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information;

[0034] The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

[0035] Optionally, if the value information indicates that the newly added bit takes the first value, the core network identifier information of the neighboring cell corresponding to the value information is the 5G core network identifier information; otherwise, the core network identifier information of the neighboring cell corresponding to the value information is other core network identifier information.

[0036] Among them, the other core network identification information includes: 4G core network identification information.

[0037] Optionally, the core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0038] This invention also provides a cell reselection device, applied to a terminal, comprising:

[0039] The first receiving module is used to receive system information broadcast by network devices within the target cell;

[0040] The first cell reselection module is used to perform cell reselection based on the system information when the terminal is in an idle state.

[0041] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0042] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0043] Optionally, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field;

[0044] The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band.

[0045] The options include: Option 1 and / or Option 5;

[0046] Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

[0047] Optionally, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0048] Optionally, the core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or,

[0049] The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information;

[0050] The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

[0051] Optionally, if the value information indicates that the newly added bit takes the first value, the core network identifier information of the neighboring cell corresponding to the value information is the 5G core network identifier information; otherwise, the core network identifier information of the neighboring cell corresponding to the value information is other core network identifier information.

[0052] Among them, the other core network identification information includes: 4G core network identification information.

[0053] Optionally, the core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0054] This invention also provides a cell reselection device, applied to network equipment, comprising:

[0055] The first broadcast module is used to broadcast system information to terminals within the target cell;

[0056] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0057] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0058] Optionally, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field;

[0059] The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band.

[0060] The options include: Option 1 and / or Option 5;

[0061] Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

[0062] Optionally, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0063] Optionally, the core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or,

[0064] The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information;

[0065] The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

[0066] Optionally, if the value information indicates that the newly added bit takes the first value, the core network identifier information of the neighboring cell corresponding to the value information is the 5G core network identifier information; otherwise, the core network identifier information of the neighboring cell corresponding to the value information is other core network identifier information.

[0067] Among them, the other core network identification information includes: 4G core network identification information.

[0068] Optionally, the core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0069] This invention also provides a terminal, including: a processor and a transceiver;

[0070] The processor is used to receive system information broadcast by network devices within the target cell via the transceiver.

[0071] When the terminal is in an idle state, cell reselection is performed based on the system information;

[0072] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0073] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0074] Optionally, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field;

[0075] The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band.

[0076] The options include: Option 1 and / or Option 5;

[0077] Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

[0078] Optionally, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0079] Optionally, the core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or,

[0080] The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information;

[0081] The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

[0082] Optionally, if the value information indicates that the newly added bit takes the first value, the core network identifier information of the neighboring cell corresponding to the value information is the 5G core network identifier information; otherwise, the core network identifier information of the neighboring cell corresponding to the value information is other core network identifier information.

[0083] Among them, the other core network identification information includes: 4G core network identification information.

[0084] Optionally, the core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0085] This invention also provides a network device, including: a processor and a transceiver;

[0086] The processor is used to broadcast system information to the terminal within the target cell via the transceiver;

[0087] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0088] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0089] Optionally, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field;

[0090] The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band.

[0091] The options include: Option 1 and / or Option 5;

[0092] Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

[0093] Optionally, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0094] Optionally, the core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or,

[0095] The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information;

[0096] The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

[0097] Optionally, if the value information indicates that the newly added bit takes the first value, the core network identifier information of the neighboring cell corresponding to the value information is the 5G core network identifier information; otherwise, the core network identifier information of the neighboring cell corresponding to the value information is other core network identifier information.

[0098] Among them, the other core network identification information includes: 4G core network identification information.

[0099] Optionally, the core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0100] This invention also provides a terminal, including a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the aforementioned cell reselection method on the terminal side.

[0101] This invention also provides a network device, including a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the aforementioned cell reselection method on the network device side.

[0102] This invention also provides a readable storage medium storing a program that, when executed by a processor, implements the steps in the aforementioned cell reselection method on the terminal side; or,

[0103] When the program is executed by the processor, it implements the steps in the cell reselection method on the network device side described above.

[0104] The beneficial effects of the above-mentioned technical solution of the present invention are as follows:

[0105] In the above scheme, the cell reselection method receives system information broadcast by network equipment within the target cell; when the terminal is in an idle state, it performs cell reselection based on the system information; wherein, the terminal is a terminal that supports 4G base station access to the 5G core network; the system information includes: connection priorities of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network; it can support the behavior of preferentially handing over to the 5G core network OPTION5 cell based on the broadcast system information in the idle state; that is, it can support the differentiated reselection of OPTION5 terminals to neighboring cells connected to different core networks (such as 5GC or EPC), and prioritize camping in the same core network OPTION5 neighboring cells, thereby reducing handover latency during cell reselection, ensuring idle state interoperability performance, and guaranteeing service continuity; it effectively solves the problems of prolonged handover and poor service continuity in the prior art where terminals supporting Option 5 perform cell reselection in the idle state. Attached Figure Description

[0106] Figure 1 This is a schematic flowchart of the cell reselection method according to an embodiment of the present invention. Figure 1 ;

[0107] Figure 2 This is a schematic flowchart of the cell reselection method according to an embodiment of the present invention. Figure 2 ;

[0108] Figure 3 This is a schematic diagram of the cell reselection device according to an embodiment of the present invention. Figure 1 ;

[0109] Figure 4 This is a schematic diagram of the cell reselection device according to an embodiment of the present invention. Figure 2 ;

[0110] Figure 5 This is a schematic diagram of the terminal structure according to an embodiment of the present invention;

[0111] Figure 6 This is a schematic diagram of the network device structure according to an embodiment of the present invention. Detailed Implementation

[0112] To make the technical problems, technical solutions and advantages of the present invention clearer, a detailed description will be given below in conjunction with the accompanying drawings and specific embodiments.

[0113] This invention addresses the problems of prolonged handover time and poor service continuity in existing technologies where terminals supporting option 5 perform cell reselection in idle state. It provides a cell reselection method applicable to terminals, such as... Figure 1 As shown, it includes:

[0114] Step 11: Receive system information broadcast by network devices within the target cell;

[0115] Step 12: When the terminal is in an idle state, perform cell reselection according to the system information; wherein, the terminal is a terminal that supports 4G base station access to 5G core network function; the system information includes: connection priority of different core networks in the 4G system, and core network identification indication information; the connection priority of 5G core network is higher than the connection priority of 4G core network.

[0116] The term "terminal supporting 4G base station access to 5G core network function" can also be understood as a terminal supporting option 5 above, but is not limited thereto. The target cell can be the cell the terminal was connected to before entering the idle state, but is not limited thereto. Step 12 may specifically include: when the terminal is in the idle state, determining the core network connection information of neighboring cells based on the system information; performing cell reselection based on the core network connection information; the core network connection information includes: the connection priority and core network identification information, but is not limited thereto.

[0117] The cell reselection method provided in this embodiment of the invention receives system information broadcast by network devices within a target cell; when the terminal is in an idle state, it performs cell reselection based on the system information; wherein the terminal is a terminal that supports 4G base station access to the 5G core network; the system information includes: connection priorities of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network; it can support the behavior of preferentially handing over to the 5G core network OPTION5 cell based on the broadcast system information in the idle state; that is, it can support the differentiated reselection of OPTION5 terminals to neighboring cells connected to different core networks (such as 5GC or EPC), and prioritize camping in the same core network OPTION5 neighboring cells, thereby reducing handover latency during cell reselection, ensuring idle state interoperability performance, and guaranteeing service continuity; it effectively solves the problems of prolonged handover and poor service continuity in the prior art where terminals supporting Option 5 perform cell reselection in the idle state.

[0118] The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; wherein, the cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option under the same frequency band; the options include: option 1 and / or option 5; option 1 corresponds to the case of 4G base station accessing 4G core network, and option 5 corresponds to the case of 4G base station accessing 5G core network (it can also be understood that: option 1 refers to the function of 4G base station accessing 4G core network, and option 5 refers to the function of 4G base station accessing 5G core network; or it can be understood that option 1 indicates that 4G base station accesses 4G core network, and option 5 indicates that 4G base station accesses 5G core network).

[0119] This ensures better priority control. Specifically, "the connection priority of the 5G core network is higher than the connection priority of the 4G core network" can mean that the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection sub-priority corresponding to the 4G core network, but this is not a limitation. The "cell reselection priority corresponding to the 5G core network" can be higher than, lower than, or equal to the "cell reselection priority corresponding to the 4G core network," without limitation. Furthermore, the cell reselection priority can also indicate the priority of different network systems within the same frequency band, and the cell reselection sub-priority can also indicate the priority of the same option under different frequency bands, without limitation. "The priority of network systems in different frequency bands" can include: the priority of the same network system in different frequency bands, and / or, the priority of different network systems in different frequency bands; regarding "network system," it can be, for example, a 4G system, a 5G system, or a 6G system, without limitation.

[0120] In this embodiment of the invention, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0121] This ensures the accurate transmission of cell reselection sub-priorities. Cell reselection-related parameters can be SIB (System Information Block) 3, but are not limited to this.

[0122] The core network identification indication information includes: the value information of newly added bits for the core network identification information; or, the core network identification indication information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information; wherein, the PLMN configuration information corresponding to a 4G base station connecting to the 4G core network is different from the PLMN configuration information corresponding to a 4G base station connecting to the 5G core network; and the PLMN configuration information corresponding to a 4G base station is different from the PLMN configuration information corresponding to a 5G base station.

[0123] This allows for more flexible transmission of core network identification and indication information.

[0124] In this embodiment of the invention, when the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information; wherein, the other core network identification information includes: 4G core network identification information.

[0125] This facilitates the accurate determination of core network identification information. Other core network identification information can also be core network identification information other than 4G and 5G; no specific restrictions are imposed here.

[0126] The core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0127] This ensures the accurate transmission of core network identification information. The parameters for co-frequency neighbor cell reselection can be SIB4, and the parameters for inter-frequency neighbor cell reselection can be SIB5, but are not limited to these. Specifically, the newly added bit is carried (or set) in the co-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the inter-frequency neighbor cell reselection parameters in the system information; the PLMN configuration information is carried (or set) in the co-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the inter-frequency neighbor cell reselection parameters in the system information.

[0128] This invention also provides a cell reselection method, applied to network devices, such as... Figure 2 As shown, it includes:

[0129] Step 21: Broadcast system information to the terminal within the target cell; wherein the terminal is a terminal that supports 4G base station access to 5G core network; the system information includes: connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than the connection priority of the 4G core network.

[0130] The term "terminal that supports 4G base station access to 5G core network" can also be understood as a terminal that supports option 5 above, but is not limited to this. The target cell can be the cell that the terminal connected to before entering the idle state, but is not limited to this.

[0131] The cell reselection method provided in this embodiment of the invention broadcasts system information to the terminal within the target cell; wherein the terminal is a terminal that supports 4G base station access to 5G core network function; the system information includes: connection priority of different core networks in the 4G system, and core network identification indication information; the connection priority of the 5G core network is higher than the connection priority of the 4G core network; it can support the behavior of (the terminal) preferentially switching to the 5G core network OPTION5 cell according to the broadcast system information in the idle state; that is, it can support the differentiated reselection of OPTION5 terminals to neighboring cells connected to different core networks (such as 5GC or EPC), and preferentially camp in the same core network OPTION5 neighboring cells, thereby reducing the handover latency during cell reselection, ensuring idle state interoperability performance, and ensuring service continuity; it effectively solves the problems of handover delay and poor service continuity of terminals supporting Option 5 in the prior art when performing cell reselection in the idle state.

[0132] The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; wherein, the cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option under the same frequency band; the options include: option 1 and / or option 5; option 1 corresponds to the case of 4G base station accessing 4G core network, and option 5 corresponds to the case of 4G base station accessing 5G core network (which can also be understood as: option 1 indicates the function of 4G base station accessing 4G core network, and option 5 indicates the function of 4G base station accessing 5G core network; or it can be understood as: option 1 indicates that 4G base station accesses 4G core network, and option 5 indicates that 4G base station accesses 5G core network).

[0133] This ensures better priority control. Specifically, "the connection priority of the 5G core network is higher than the connection priority of the 4G core network" can mean that the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection sub-priority corresponding to the 4G core network, but this is not a limitation. The "cell reselection priority corresponding to the 5G core network" can be higher than, lower than, or equal to the "cell reselection priority corresponding to the 4G core network," and is not limited here. Furthermore, the cell reselection priority can also indicate the priority of different core networks within the same frequency band, and the cell reselection sub-priority can also indicate the priority of the same option under different frequency bands, and is not limited here.

[0134] In this embodiment of the invention, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0135] This ensures the accurate transmission of cell reselection sub-priorities. Cell reselection-related parameters can be SIB (System Information Block) 3, but are not limited to this.

[0136] The core network identification indication information includes: the value information of newly added bits for the core network identification information; or, the core network identification indication information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information; wherein, the PLMN configuration information corresponding to a 4G base station connecting to the 4G core network is different from the PLMN configuration information corresponding to a 4G base station connecting to the 5G core network; and the PLMN configuration information corresponding to a 4G base station is different from the PLMN configuration information corresponding to a 5G base station.

[0137] This allows for more flexible transmission of core network identification and indication information.

[0138] In this embodiment of the invention, when the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information; wherein, the other core network identification information includes: 4G core network identification information.

[0139] This facilitates the accurate determination of core network identification information. Other core network identification information can also be core network identification information other than 4G and 5G; no specific restrictions are imposed here.

[0140] The core network identification information is carried (or set) in the same-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection parameters in the system information.

[0141] This ensures the accurate transmission of core network identification information. The parameters for co-frequency neighbor cell reselection can be SIB4, and the parameters for inter-frequency neighbor cell reselection can be SIB5, but are not limited to these. Specifically, the newly added bit is carried (or set) in the co-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the inter-frequency neighbor cell reselection parameters in the system information; the PLMN configuration information is carried (or set) in the co-frequency neighbor cell reselection parameters in the system information, or carried (or set) in the inter-frequency neighbor cell reselection parameters in the system information.

[0142] The cell reselection method provided in the embodiments of the present invention will be illustrated below with examples. The target cell is a target 4G cell, the cell reselection related parameters are System Information Block (SIB3) as an example, the co-frequency neighbor cell reselection related parameters are SIB4 as an example, the inter-frequency neighbor cell reselection related parameters are SIB5 as an example, and other core network identification information is 4G core network identification information as an example. In addition, the above system information may also be referred to as system message in the following content.

[0143] To address the aforementioned technical problems and considering the relevant content of existing protocols, this embodiment of the invention provides a cell reselection method, specifically a scheme for idle-state terminal cell reselection, which can achieve the preferred handover to the 5GC core network OPTION5 cell by broadcasting the neighboring cell core network identifier (corresponding to the aforementioned core network identifier indication information) and the reselection sub-priority (corresponding to the aforementioned cell reselection sub-priority).

[0144] The aforementioned existing protocol-related content includes: In the current 3GPP protocol, the main processes involved in a terminal's power-on and camping process include Public Land Mobile Network (PLMN) selection, cell selection and reselection, and location area registration. Frequency scanning and downlink synchronization primarily involve physical layer processes. Processes related to higher layers mainly include: reading the Master Information Block (MIB) and System Information Block (SIB) 1, PLMN selection, cell selection and reselection, and location area registration. System information primarily provides cell-level configuration information to the terminal, enabling it to perform cell selection and cell reselection operations. LTE System Information is divided into Master Information Block (MIB) and multiple System Information Blocks (SIBs). System messages involved in cell reselection include SIB3, SIB4, and SIB5. SIB3 provides general information for reselection across frequencies, frequencies, and systems (such as reselection priority); SIB4 provides a list of neighboring cells at the same frequency and reselection configuration information, as well as a blacklist; SIB5 provides a list of neighboring cells at different frequencies within the system and reselection configuration information, as well as a blacklist. The aforementioned protocol description does not currently support EPC or 5GC-related attributes for cell reselection, nor does it support identifiers for different priorities within the same frequency configuration within the system. Related protocol fields still need enhancement. Furthermore, under the current protocol's system messages regarding cell reselection-related configurations (including SIB3, SIB4, and SIB5), the workflow of prioritizing 5GC during cell reselection by Opt5 terminals (i.e., terminals supporting Opt5) in idle state cannot be implemented, resulting in prolonged handover time and compromised service continuity.

[0145] Specifically, the solutions provided in the embodiments of the present invention involve the following:

[0146] (1) First, the network device in the target 4G cell (the cell the terminal connects to before entering the idle state) introduces the supplementary field of cellReselectionSubPriority (corresponding to the newly added field mentioned above) into the system message SIB3 (corresponding to cell reselection-related parameters). This supports configuring the sub-priority of connecting to different core networks (such as EPC or 5GC) within the 4G system (corresponding to the cell reselection sub-priority mentioned above), allowing the terminal in the cell to preferentially access 5GC and camp on the 4G network. This can also be understood as the 5GC having a higher priority than EPC (corresponding to the 5G core network connection priority being higher than the 4G core network connection priority). In addition, cell reselection priority and cell reselection sub-priority can be combined, for example: determining the target frequency band (or target frequency point) corresponding to the first highest priority (i.e., the highest priority among cell reselection priorities) based on the cell reselection priority; and determining the final highest priority (e.g., the highest priority among cell reselection sub-priorities) based on the cell reselection sub-priority within the target frequency band. For example, see the following example for priority settings:

[0147] Architecture frequency Parameter name Default parameter configuration (example) OPTION1 1800MHz cellReselectionPriority 3 OPTION1 1900MHz cellReselectionPriority 1 OPTION1 1800MHz cellReselectionSubPriority 3.4 OPTION1 1900MHz cellReselectionSubPriority 1.4 OPTION5 1800MHz cellReselectionSubPriority 3.2 OPTION5 1900MHz cellReselectionSubPriority 1.2

[0148] (2) Then, the target 4G cell will introduce the EPC or 5GC core network identifier (which can be used to distinguish whether the core network connected to the neighboring cell is 4G or 5G; corresponding to the core network identifier indication information mentioned above) into the system message SIB4 or SIB5 (corresponding to the parameters related to the reselection of neighboring cells in the same or different frequency ranges). Specifically, the candidate schemes for the introduction method are as follows (one can be selected):

[0149] 1) Add a binary bit to the broadcast field (a specific implementation example of the newly added bit mentioned above) to support the distinction between LTE (corresponding to 4G base station) connection to 5GC and EPC. For example, set the binary bit to connectto5GC=TURE (i.e., connected to 5GC=true). If the first value is taken, it means that LTE (4G base station) is connected to 5GC (i.e., OPTION5; corresponding to the above value information, the core network identification information of the neighboring cell is 5G core network identification information). Otherwise (e.g., take the second value), it means that LTE (4G base station) is connected to EPC (i.e., OPTION1; corresponding to the above value information, the core network identification information of the neighboring cell is other core network identification information).

[0150] 2) Determine the core network to which the neighboring cell is connected based on different PLMN configurations (corresponding to the above core network identification information, including: PLMN configuration information corresponding to the core network identification information). Specifically: through differentiated PLMN configuration, it is supported for base stations to configure different PLMNs for LTE (4G base stations) connecting to 5GC and EPC (i.e., different PLMNs for connecting to 5GC and connecting to EPC), and the PLMNs for LTE (4G base stations) and 5G (5G base stations) are different; the PLMN configuration information corresponding to the above-mentioned 4G base station connecting to the 4G core network is different from the PLMN configuration information corresponding to the 4G base station connecting to the 5G core network; the PLMN configuration information corresponding to the 4G base station is different from the PLMN configuration information corresponding to the 5G base station.

[0151] (3) Finally, terminals supporting OPTION5, in idle state, can perform PLMN selection, cell reselection, and downlink synchronization based on the read system messages SIB3 and SIB4 (or SIB5) to achieve priority access and retention of the target OPTION5 neighboring cell. Specifically, this may include: the terminal receiving system information broadcast by the network device, and performing cell reselection based on the system information in idle state; wherein, the connection priority can be obtained based on SIB3, and the core network identifier corresponding to the neighboring cell can be obtained based on SIB4 (or SIB5) (i.e., the aforementioned core network identifier information); then, cell reselection (i.e., reselecting the target cell) can be performed based on the obtained connection priority and core network identifier.

[0152] Therefore, the present invention specifically provides a scheme for idle-state terminal cell reselection, which can realize the behavior of preferentially selecting the 5GC core network OPTION5 cell during handover by introducing neighbor cell identifiers (corresponding to the above-mentioned core network identifier indication information) of the same 4G network (i.e., 4G base station) + different core network (such as EPC and 5GC) in the broadcast message SIB4 or SIB5, and introducing the sub-priority of neighbor cell reselection of the same or different frequency points in the system (corresponding to the above-mentioned cell reselection sub-priority) in the broadcast message SIB3.

[0153] In summary, the solution provided by the embodiments of the present invention can enable OPTION5 terminals to be reselected to neighboring cells connected to different core networks (such as 5GC or EPC), and can preferentially reside in the same core network OPTION5 neighboring cells, thereby reducing handover latency, ensuring idle-state interoperability performance, and guaranteeing service continuity.

[0154] This invention also provides a cell reselection device, applied to a terminal, such as... Figure 3 As shown, it includes:

[0155] The first receiving module 31 is used to receive system information broadcast by the network device in the target cell;

[0156] The first cell reselection module 32 is used to perform cell reselection based on the system information when the terminal is in an idle state.

[0157] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0158] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0159] The cell reselection device provided in this embodiment of the invention receives system information broadcast by network equipment in a target cell; when the terminal is in an idle state, it performs cell reselection according to the system information; wherein, the terminal is a terminal that supports 4G base station access to 5G core network function; the system information includes: connection priority of different core networks in the 4G system, and core network identification indication information; the connection priority of the 5G core network is higher than the connection priority of the 4G core network; it can support the behavior of preferentially handing over to the 5G core network OPTION5 cell according to the broadcast system information in the idle state; that is, it can support the differentiated reselection of OPTION5 terminals to neighboring cells connected to different core networks (such as 5GC or EPC), and prioritize camping in the same core network OPTION5 neighboring cells, thereby reducing the handover latency during cell reselection, ensuring idle state interoperability performance, and ensuring service continuity; it effectively solves the problems of prolonged handover and poor service continuity in the prior art where terminals supporting Option 5 perform cell reselection in the idle state.

[0160] The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; wherein, the cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option under the same frequency band; the options include: option 1 and / or option 5; option 1 corresponds to the case of 4G base station accessing 4G core network, and option 5 corresponds to the case of 4G base station accessing 5G core network.

[0161] In this embodiment of the invention, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0162] The core network identification indication information includes: the value information of newly added bits for the core network identification information; or, the core network identification indication information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information; wherein, the PLMN configuration information corresponding to a 4G base station connecting to the 4G core network is different from the PLMN configuration information corresponding to a 4G base station connecting to the 5G core network; and the PLMN configuration information corresponding to a 4G base station is different from the PLMN configuration information corresponding to a 5G base station.

[0163] In this embodiment of the invention, when the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information; wherein, the other core network identification information includes: 4G core network identification information.

[0164] In this embodiment of the invention, the core network identifier indication information is carried (or set) in the same-frequency neighbor cell reselection related parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameters in the system information.

[0165] The aforementioned implementation embodiments of the cell reselection method on the terminal side are all applicable to the embodiments of the cell reselection device and can achieve the same technical effect.

[0166] This invention also provides a cell reselection device, applied to network equipment, such as... Figure 4 As shown, it includes:

[0167] The first broadcast module 41 is used to broadcast system information to the terminal within the target cell;

[0168] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0169] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0170] The cell reselection device provided in this embodiment of the invention broadcasts system information to a terminal within a target cell. The terminal is a terminal that supports 4G base station access to the 5G core network. The system information includes: connection priorities of different core networks within the 4G system, and core network identification information. The connection priority of the 5G core network is higher than that of the 4G core network. This enables the terminal to preferentially hand over to the 5G core network OPTION5 cell in idle mode based on the broadcast system information. In other words, it supports differentiated reselection by the OPTION5 terminal to neighboring cells connected to different core networks (such as 5GC or EPC), and prioritizes camping in the same core network OPTION5 neighboring cells, thereby reducing handover latency during cell reselection and ensuring idle-mode interoperability performance and service continuity. This effectively solves the problems of prolonged handover and poor service continuity in the prior art where terminals supporting Option 5 perform cell reselection in idle mode.

[0171] The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; wherein, the cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option under the same frequency band; the options include: option 1 and / or option 5; option 1 corresponds to the case of 4G base station accessing 4G core network, and option 5 corresponds to the case of 4G base station accessing 5G core network.

[0172] In this embodiment of the invention, the cell reselection sub-priority is carried (or set) in the cell reselection related parameters in the system information.

[0173] The core network identification indication information includes: the value information of newly added bits for the core network identification information; or, the core network identification indication information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information; wherein, the PLMN configuration information corresponding to a 4G base station connecting to the 4G core network is different from the PLMN configuration information corresponding to a 4G base station connecting to the 5G core network; and the PLMN configuration information corresponding to a 4G base station is different from the PLMN configuration information corresponding to a 5G base station.

[0174] In this embodiment of the invention, when the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information; wherein, the other core network identification information includes: 4G core network identification information.

[0175] In this embodiment of the invention, the core network identifier indication information is carried (or set) in the same-frequency neighbor cell reselection related parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameters in the system information.

[0176] The implementation embodiments of the cell reselection method on the network device side described above are all applicable to the embodiments of the cell reselection device, and can achieve the same technical effect.

[0177] This invention also provides a terminal, such as... Figure 5 As shown, it includes: processor 51 and transceiver 52;

[0178] The processor 51 is used to receive system information broadcast by the network device in the target cell through the transceiver 52;

[0179] When the terminal is in an idle state, cell reselection is performed based on the system information;

[0180] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0181] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0182] The terminal provided in this embodiment of the invention receives system information broadcast by a network device within a target cell; when the terminal is in an idle state, it performs cell reselection based on the system information; wherein, the terminal is a terminal that supports 4G base station access to the 5G core network; the system information includes: connection priorities of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network; it can support the behavior of preferentially switching to the 5G core network OPTION5 cell based on the broadcast system information in the idle state; that is, it can support the differentiated reselection of OPTION5 terminals to neighboring cells connected to different core networks (such as 5GC or EPC), and prioritize camping in the same core network OPTION5 neighboring cells, thereby reducing the handover latency during cell reselection, ensuring idle state interoperability performance, and guaranteeing service continuity; it effectively solves the problems of prolonged handover and poor service continuity in the prior art where terminals supporting Option 5 perform cell reselection in the idle state.

[0183] In this embodiment of the invention, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; wherein, the cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option under the same frequency band; the options include: option 1 and / or option 5; option 1 corresponds to the case of 4G base station accessing 4G core network, and option 5 corresponds to the case of 4G base station accessing 5G core network.

[0184] The cell reselection priority is carried (or set) in the cell reselection related parameters in the system information.

[0185] In this embodiment of the invention, the core network identifier indication information includes: value information of newly added bits for the core network identifier information; or, the core network identifier indication information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identifier information; wherein, the PLMN configuration information corresponding to a 4G base station connecting to a 4G core network is different from the PLMN configuration information corresponding to a 4G base station connecting to a 5G core network; and the PLMN configuration information corresponding to a 4G base station is different from the PLMN configuration information corresponding to a 5G base station.

[0186] Wherein, if the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is the 5G core network identification information; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information; wherein, the other core network identification information includes: 4G core network identification information.

[0187] In this embodiment of the invention, the core network identifier indication information is carried (or set) in the same-frequency neighbor cell reselection related parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameters in the system information.

[0188] The aforementioned implementation embodiments of the cell reselection method on the terminal side are all applicable to the embodiments of this terminal and can achieve the same technical effect.

[0189] This invention also provides a network device (also known as a network-side device), such as... Figure 6 As shown, it includes: a processor 61 and a transceiver 62;

[0190] The processor 61 is used to broadcast system information to the terminal within the target cell via the transceiver 62;

[0191] The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network;

[0192] The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network.

[0193] The network device provided in this embodiment of the invention broadcasts system information to a terminal within a target cell; wherein the terminal is a terminal that supports 4G base station access to the 5G core network; the system information includes: connection priorities of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network; it can support the behavior of (the terminal) preferentially switching to the 5G core network OPTION5 cell according to the broadcast system information in the idle state; that is, it can support the differentiated reselection of OPTION5 terminals to neighboring cells connected to different core networks (such as 5GC or EPC), and preferentially camp on the same core network OPTION5 neighboring cells, thereby reducing the handover latency during cell reselection, ensuring idle state interoperability performance, and guaranteeing service continuity; it effectively solves the problems of prolonged handover and poor service continuity in the prior art where terminals supporting Option 5 perform cell reselection in the idle state.

[0194] In this embodiment of the invention, the connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; wherein, the cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option under the same frequency band; the options include: option 1 and / or option 5; option 1 corresponds to the case of 4G base station accessing 4G core network, and option 5 corresponds to the case of 4G base station accessing 5G core network.

[0195] The cell reselection priority is carried (or set) in the cell reselection related parameters in the system information.

[0196] In this embodiment of the invention, the core network identifier indication information includes: value information of newly added bits for the core network identifier information; or, the core network identifier indication information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identifier information; wherein, the PLMN configuration information corresponding to a 4G base station connecting to a 4G core network is different from the PLMN configuration information corresponding to a 4G base station connecting to a 5G core network; and the PLMN configuration information corresponding to a 4G base station is different from the PLMN configuration information corresponding to a 5G base station.

[0197] Wherein, if the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is the 5G core network identification information; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information; wherein, the other core network identification information includes: 4G core network identification information.

[0198] In this embodiment of the invention, the core network identifier indication information is carried (or set) in the same-frequency neighbor cell reselection related parameters in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameters in the system information.

[0199] The aforementioned implementation embodiments of the cell reselection method on the network device side are all applicable to the embodiments of the network device and can achieve the same technical effect.

[0200] This invention also provides a terminal, including a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the aforementioned cell reselection method on the terminal side.

[0201] The aforementioned implementation embodiments of the cell reselection method on the terminal side are all applicable to the embodiments of this terminal and can achieve the same technical effect.

[0202] This invention also provides a network device, including a memory, a processor, and a program stored in the memory and executable on the processor; when the processor executes the program, it implements the aforementioned cell reselection method on the network device side.

[0203] The aforementioned implementation embodiments of the cell reselection method on the network device side are all applicable to the embodiments of the network device and can achieve the same technical effect.

[0204] This invention also provides a readable storage medium storing a program that, when executed by a processor, implements the steps in the cell reselection method on the terminal side described above; or, when executed by a processor, the program implements the steps in the cell reselection method on the network device side described above.

[0205] The aforementioned implementation embodiments of the cell reselection method on the terminal side or network device side are all applicable to the embodiments of the readable storage medium and can achieve the same technical effect.

[0206] It should be noted that many of the functional components described in this specification are referred to as modules in order to more specifically emphasize the independence of their implementation.

[0207] In this embodiment of the invention, the module can be implemented in software so that it can be executed by various types of processors. For example, an identified executable code module may include one or more physical or logical blocks of computer instructions, which may be constructed as objects, procedures, or functions. Nevertheless, the executable code of the identified module does not need to be physically located together, but may include different instructions stored in different bits, which, when logically combined, constitute the module and achieve the module's intended purpose.

[0208] In practice, an executable code module can be a single instruction or many instructions, and can even be distributed across multiple different code segments, different programs, and across multiple memory devices. Similarly, operational data can be identified within the module and can be implemented in any suitable form and organized within any suitable type of data structure. This operational data can be collected as a single dataset or distributed across different locations (including different storage devices), and can exist, at least in part, solely as electronic signals within the system or network.

[0209] When a module can be implemented using software, considering the current level of hardware technology, modules that can be implemented in software can be implemented using hardware circuits by those skilled in the art to achieve the corresponding functions, without considering cost. These hardware circuits include conventional very-large-scale integrated circuits (VLSI) or gate arrays, as well as existing semiconductors such as logic chips and transistors, or other discrete components. Modules can also be implemented using programmable hardware devices, such as field-programmable gate arrays, programmable array logic, and programmable logic devices.

[0210] The above describes the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A cell reselection method, applied to a terminal, characterized in that, include: Receive system information broadcast by network devices within the target cell; When the terminal is in an idle state, cell reselection is performed based on the system information; The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network; The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network. The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band; the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection priority corresponding to the 4G core network. The options include: Option 1 and / or Option 5; Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

2. The cell reselection method according to claim 1, characterized in that, The core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or, The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information; The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

3. The cell reselection method according to claim 2, characterized in that, When the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is the 5G core network identification information. Otherwise, the core network identification information corresponding to the value information of the neighboring cell is other core network identification information; Among them, the other core network identification information includes: 4G core network identification information.

4. A cell reselection method, applied to network equipment, characterized in that, include: Broadcast system information to terminals within the target cell; The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network; The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network. The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band; the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection priority corresponding to the 4G core network. The options include: Option 1 and / or Option 5; Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

5. The cell reselection method according to claim 4, characterized in that, The core network identifier indication information includes: the value information of the newly added bits for the core network identifier information; or, The core network identification information includes: Public Land Mobile Network (PLMN) configuration information corresponding to the core network identification information; The PLMN configuration information for 4G base stations connected to the 4G core network is different from that for 4G base stations connected to the 5G core network; the PLMN configuration information for 4G base stations is different from that for 5G base stations.

6. The cell reselection method according to claim 5, characterized in that, When the value information indicates that the newly added bit takes the first value, the core network identification information of the neighboring cell corresponding to the value information is the 5G core network identification information. Otherwise, the core network identification information corresponding to the value information of the neighboring cell is other core network identification information; Among them, the other core network identification information includes: 4G core network identification information.

7. A cell reselection device, applied to a terminal, characterized in that, include: The first receiving module is used to receive system information broadcast by network devices within the target cell; The first cell reselection module is used to perform cell reselection based on the system information when the terminal is in an idle state. The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network; The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network. The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band; the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection priority corresponding to the 4G core network. The options include: Option 1 and / or Option 5; Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

8. A cell reselection device, applied to network equipment, characterized in that, include: The first broadcast module is used to broadcast system information to terminals within the target cell; The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network; The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network. The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band; the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection priority corresponding to the 4G core network. The options include: Option 1 and / or Option 5; Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

9. A terminal, characterized in that, include: Processor and transceiver; The processor is used to receive system information broadcast by network devices within the target cell via the transceiver. When the terminal is in an idle state, cell reselection is performed based on the system information; The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network; The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network. The connection priority includes: cell reselection priority and cell reselection sub-priority carried by the newly added field; The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band; the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection priority corresponding to the 4G core network. The options include: Option 1 and / or Option 5; Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

10. A network device, characterized in that, include: Processor and transceiver; The processor is used to broadcast system information to the terminal within the target cell via the transceiver; The terminal mentioned above is a terminal that supports the function of 4G base stations accessing the 5G core network; The system information includes: the connection priority of different core networks within the 4G system, and core network identification information; the connection priority of the 5G core network is higher than that of the 4G core network. The connection priority includes: cell reselection priority and 10 levels of cell reselection sub-priority carried by the newly added field; The cell reselection priority can indicate the priority of network systems in different frequency bands, and the cell reselection sub-priority can indicate the priority of each option in the same frequency band; the cell reselection sub-priority corresponding to the 5G core network is higher than the cell reselection priority corresponding to the 4G core network. The options include: Option 1 and / or Option 5; Option 1 corresponds to the case where a 4G base station accesses the 4G core network, and option 5 corresponds to the case where a 4G base station accesses the 5G core network.

11. A terminal, comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that, When the processor executes the program, it implements the cell reselection method as described in any one of claims 1 to 3.

12. A network device, comprising a memory, a processor, and a program stored in the memory and executable on the processor; characterized in that, When the processor executes the program, it implements the cell reselection method as described in any one of claims 4 to 6.

13. A readable storage medium having a program stored thereon, characterized in that, When executed by a processor, the program implements the steps of the cell reselection method as described in any one of claims 1 to 3; or... When the program is executed by the processor, it implements the steps in the cell reselection method as described in any one of claims 4 to 6.

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