CN116321313A

CN116321313A - Cell reselection method, device, terminal and network equipment

Info

Publication number: CN116321313A
Application number: CN202111560464.4A
Authority: CN
Inventors: 郝悦; 江天明; 邓伟
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2021-12-20
Filing date: 2021-12-20
Publication date: 2023-06-23

Abstract

The invention provides a cell reselection method, a device, a terminal and network equipment, wherein the cell reselection method comprises the following steps: receiving system information broadcast by network equipment in a target cell; under the condition that the terminal is in an idle state, cell reselection is performed according to system information; the terminal is a terminal supporting the function of the 4G base station to access the 5G core network; 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 that of the 4G core network. The scheme well solves the problems that in the prior art, when a terminal supporting option 5 performs cell reselection in an idle state, the service continuity is poor due to the fact that the terminal is prolonged during switching.

Description

Cell reselection method, device, terminal and network equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a cell reselection method, a device, a terminal, and a network device.

Background

Currently, according to the 5G service requirement, the introduction time, the construction cost and other considerations, two sets of technical systems of independent networking NSA and independent networking SA of a 5G architecture are promoted, and the technical options related to the current standard mainly comprise 5 major classes (such as options Opt2, 3, 4, 5 and 7 series); wherein, opt5 is a 4G base station upgrade access 5GC (5G core network), and the core network is completely consistent with Opt 2.

In addition, considering that the asset utilization rate of the 4G base station in the long-term stage of 5G evolution is gradually reduced, meanwhile, the 4G evolution to 5G is not the optimal choice in terms of investment income and service development and construction workload, whereas Opt5 is a splicing scheme of a 4G access layer and a 5G non-access layer, 2B services (i.e. industry client services) such as network slicing, qos (quality of service) and the like are supported, and the 4G network can be supported only by software upgrading, so that a low-cost solution can be provided for industry clients. So that the Opt5 scheme can be properly adopted.

Specifically, to implement the Opt5 basic architecture, the 4G base station needs to support the coexistence of Opt1 and Opt5, and from the system workflow, the terminal cannot determine that the neighbor cell is Opt1 or an Opt5 attribute (where Opt1 is connected to EPC (4G core network), and Opt5 is connected to 5 GC), which may cause subsequent mobility management flows that cross the core network or not. However, the mobility management flows of the cross-core network and the non-cross-core network are different, the business continuity of the cross-core network is poor, and the user experience is poor; for cell reselection of idle state terminals, the service continuity cannot be guaranteed due to the fact that the time of switching is prolonged.

In view of the above, in the prior art, for a terminal supporting option 5 (i.e., supporting a 4G base station to access a 5G core network function), there are problems of prolonged handover, poor service continuity, and the like when performing cell reselection in an idle state.

Disclosure of Invention

The invention aims to provide a cell reselection method, a cell reselection device, a terminal and network equipment, which are used for solving the problems that in the prior art, when a terminal supporting option 5 performs cell reselection in an idle state, the switching is prolonged and the service continuity is poor.

In order to solve the above technical problems, an embodiment of the present invention provides a cell reselection method, which is applied to a terminal, and includes:

receiving system information broadcast by network equipment in a target cell;

under the condition that the terminal is in an idle state, cell reselection is performed according to the system information;

the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network;

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 that of the 4G core network.

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

the cell reselection priorities can indicate the priorities of network systems of different frequency bands, and the cell reselection sub-priorities can indicate the priorities of options in the same frequency band;

The options include: option 1 and/or option 5;

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

Optionally, the cell reselection sub-priority is carried (or set) in a cell reselection related parameter in the system information.

Optionally, the core network identification indication information includes: the value information of the newly added bit aiming at the core network identification information; or alternatively, the process may be performed,

the core network identification indication information comprises: public land mobile network PLMN configuration information corresponding to the core network identification information;

the PLMN configuration information corresponding to the 4G base station connection 4G core network is different from the PLMN configuration information corresponding to the 4G base station connection 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.

Optionally, 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.

Optionally, the core network identifier indication information is carried (or set) in a co-frequency neighbor cell reselection related parameter in the system information, or is carried (or set) in a different-frequency neighbor cell reselection related parameter in the system information.

The embodiment of the invention also provides a cell reselection method which is applied to the network equipment and comprises the following steps:

broadcasting system information to a terminal in a target cell;

the options include: option 1 and/or option 5;

The embodiment of the invention also provides a cell reselection device which is applied to the terminal and comprises the following steps:

the first receiving module is used for receiving system information broadcast by the network equipment in the target cell;

the first reselection module is used for reselecting the cell according to the system information under the condition that the terminal is in an idle state;

the options include: option 1 and/or option 5;

The embodiment of the invention also provides a cell reselection device which is applied to the network equipment and comprises the following components:

A first broadcasting module for broadcasting system information to terminals in a target cell;

the options include: option 1 and/or option 5;

The embodiment of the invention also provides a terminal, which comprises: a processor and a transceiver;

the processor is configured to receive, through the transceiver, system information broadcast by a network device in a target cell;

the options include: option 1 and/or option 5;

The embodiment of the invention also provides a network device, which comprises: a processor and a transceiver;

the processor is configured to broadcast system information to a terminal in a target cell through the transceiver;

the options include: option 1 and/or option 5;

The embodiment of the invention also provides a terminal which comprises a memory, a processor and a program which is stored in the memory and can run on the processor; and the processor realizes the cell reselection method at the terminal side when executing the program.

The embodiment of the invention also provides a network device which comprises a memory, a processor and a program which is stored in the memory and can run on the processor; and the processor realizes the cell reselection method at the network equipment side when executing the program.

The embodiment of the invention also provides a readable storage medium, which stores a program, and the program realizes the steps in the cell reselection method at the terminal side when being executed by a processor; or alternatively, the process may be performed,

the program when executed by the processor implements the steps in the cell reselection method at the network device side described above.

The technical scheme of the invention has the following beneficial effects:

in the above scheme, the cell reselection method receives system information broadcasted by the network device in the target cell; under the condition that the terminal is in an idle state, cell reselection is performed according to the system information; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support and realize the preferable switching to the 5G core network operation 5 cell according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

Drawings

Fig. 1 is a schematic flow chart of a cell reselection method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a cell reselection method according to an embodiment of the present invention;

fig. 3 is a schematic diagram of a cell reselection device according to an embodiment of the present invention;

fig. 4 is a schematic diagram of a cell reselection device according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a terminal structure according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a network device according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.

The invention provides a cell reselection method, which is applied to a terminal and shown in fig. 1, and aims at solving the problems that in the prior art, when a terminal supporting option 5 performs cell reselection in an idle state, the cell reselection is prolonged and service continuity is poor, and comprises the following steps:

step 11: receiving system information broadcast by network equipment in a target cell;

step 12: under the condition that the terminal is in an idle state, cell reselection is performed according to the system information; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network.

The term "terminal supporting the 4G base station access 5G core network function" is also understood to be a terminal supporting the above option5, but is not limited thereto. The target cell may be a cell to which the terminal is connected before entering an idle state, but is not limited thereto. Step 12 may specifically include: under the condition that the terminal is in an idle state, determining core network connection information of a neighboring cell according to the system information; cell reselection is carried out according to the core network connection information; the core network connection information includes: the connection priority and the core network identification information are not limited thereto.

The cell reselection method provided by the embodiment of the invention is characterized by receiving the system information broadcast by the network equipment in the target cell; under the condition that the terminal is in an idle state, cell reselection is performed according to the system information; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support and realize the preferable switching to the 5G core network operation 5 cell according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

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

This ensures better priority control. The "connection priority of the 5G core network is higher than that of the 4G core network" may specifically be: 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 not limited thereto. The "cell reselection priority corresponding to the 5G core network" may be higher, lower, or equal to the "cell reselection priority corresponding to the 4G core network", which is not limited herein. In addition, the cell reselection priority can also indicate the priority of different network systems in the same frequency band, and the cell reselection sub-priority can also indicate the priority of the same option in different frequency bands, which is not limited herein. The "priority of the network systems of different frequency bands" may include: the priority of the same network system of different frequency bands and/or the priority of different network systems of different frequency bands; as for the "network system", it is possible to: such as a 4G system, 5G system, or 6G system, etc., without limitation.

In the embodiment of the present invention, the cell reselection sub-priority is carried (or set) in a cell reselection related parameter in the system information.

Thus, accurate transmission of the cell reselection sub-priority can be ensured. The cell reselection related parameter may be SIB (system information block) 3, but is not limited thereto.

Wherein the core network identification indication information includes: the value information of the newly added bit aiming at the core network identification information; alternatively, the core network identification indication information includes: public land mobile network PLMN configuration information corresponding to the core network identification information; the PLMN configuration information corresponding to the 4G base station connection 4G core network is different from the PLMN configuration information corresponding to the 4G base station connection 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.

In this way, the transmission of the core network identification indication information can be more flexibly carried out.

In the embodiment of the present 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.

This facilitates accurate determination of the core network identification information. Other core network identification information may be other core network identification information besides 4G and 5G, which is not limited herein.

The core network identification indication information is carried (or set) in the same-frequency neighbor cell reselection related parameter in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameter in the system information.

Thus, the accurate transmission of the core network identification indication information can be ensured. The co-frequency neighbor cell reselection related parameter may be SIB4, and the inter-frequency neighbor cell reselection related parameter may be SIB5, but is not limited thereto. Specifically, the new added bit is carried (or set) in the same-frequency neighbor cell reselection related parameter in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameter in the system information; the PLMN configuration information is carried (or set) in the same-frequency neighbor cell reselection related parameter in the system information, or carried (or set) in the different-frequency neighbor cell reselection related parameter in the system information.

The embodiment of the invention also provides a cell reselection method which is applied to the network equipment, as shown in fig. 2, and comprises the following steps:

Step 21: broadcasting system information to a terminal in a target cell; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network.

The term "terminal supporting the 4G base station access 5G core network function" is also understood to be a terminal supporting the above option5, but is not limited thereto. The target cell may be a cell to which the terminal is connected before entering an idle state, but is not limited thereto.

The cell reselection method provided by the embodiment of the invention broadcasts system information to a terminal in a target cell; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support the behavior of realizing (terminal) to switch to the 5G core network operation 5 cell preferably according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

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

This ensures better priority control. The "connection priority of the 5G core network is higher than that of the 4G core network" may specifically be: 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 not limited thereto. The "cell reselection priority corresponding to the 5G core network" may be higher, lower, or equal to the "cell reselection priority corresponding to the 4G core network", which is not limited herein. In addition, the cell reselection priority may also indicate the priorities of different core networks in the same frequency band, and the cell reselection sub-priority may also indicate the priorities of the same options in different frequency bands, which is not limited herein.

The following illustrates the cell reselection method provided by the embodiment of the present invention, where the target cell is exemplified by a target 4G cell, the cell reselection related parameter is exemplified by a system information block SIB3, the same-frequency neighbor cell reselection related parameter is exemplified by SIB4, the different-frequency neighbor cell reselection related parameter is exemplified by SIB5, and other core network identification information is exemplified by 4G core network identification information; in addition, the above-described system information may also be referred to as a system message in the following.

Aiming at the technical problems, and considering the related content of the existing protocol, the embodiment of the invention provides a cell reselection method, which can be concretely realized as a scheme for idle state terminal cell reselection, and can realize the action of preferably switching to a 5GC core network OPTION5 cell by broadcasting a neighboring cell core network identifier (corresponding to the core network identifier indication information) and a reselection sub-priority (corresponding to the cell reselection sub-priority).

Wherein, the related content of the existing protocol comprises: in the current 3GPP protocol, the main processes involved from startup to residence of the terminal include PLMN selection, cell selection and reselection, location area registration, and the like. The frequency point scanning and the downlink synchronization mainly relate to a physical layer flow, and a flow related to a high layer mainly comprises the following steps: master information block MIB and SIB (system information block) 1 are read, plmn selection, cell selection and reselection, and location area registration. The system information mainly provides configuration information of a cell level for the terminal, so that the terminal can execute operations such as cell selection, cell reselection and the like, and the LTE system information (System Information) is divided into MasterInformationBlock (MIB) and a plurality of SystemInformationBlocks (SIBs), and system information related to cell reselection comprises SIB3, SIB4 and SIB5. Wherein SIB3 provides information (e.g., reselection priority) for co-channel, inter-channel, and inter-system reselection; SIB4 may provide the same frequency neighbor list and reselection configuration information, as well as a blacklist; SIB5 may provide intra-system inter-frequency neighbor list and reselection configuration information, as well as a blacklist. The protocol description does not support related attributes of EPC or 5GC of a cell reselection neighbor cell, and identifiers with different priorities are configured in the same frequency in a system, and related protocol fields still need to be enhanced. Based on this, under the relevant configuration (including SIB3, SIB4 and SIB 5) of the system message for cell reselection in the current protocol, the workflow of preferably 5GC when the Opt5 terminal (i.e., the terminal supporting Opt 5) performs cell reselection in an idle state cannot be realized, which leads to the prolongation of the handover time and the service continuity cannot be ensured.

Specifically, the scheme provided by the embodiment of the invention relates to the following contents:

(1) Firstly, a system message SIB3 (corresponding to a cell reselection related parameter) is introduced into a (cell) reselection sub-priority (cell reselection sub-priority) supplementary field (corresponding to the newly added field) (a cell to which a network device is connected before a target 4G cell (terminal enters an idle state), so that the configuration of sub-priorities (corresponding to the cell reselection sub-priorities) of connecting different core networks (such as EPC or 5 GC) in a 4G system can be supported, and the terminal in the cell can be allowed to realize preferential access to 5GC in the 4G network and realize residence. It can also be understood that 5GC has a higher priority than EPC (connection priority corresponding to the above 5G core network is higher than connection priority of 4G core network). In addition, a combination process may be performed for a cell reselection priority (celReselection priority) and a cell reselection sub-priority, such as: determining a target frequency band (also can be a target frequency point) corresponding to the first highest priority (namely, the highest priority in the cell reselection priorities) according to the cell reselection priorities; the final highest priority (e.g., the highest priority among the cell reselection sub-priorities) is determined based on the cell reselection sub-priorities in the target frequency band. For the setting of the priority, see the following table example:

Architecture for a computer system	Frequency point	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

(2) Then, the target 4G cell introduces the system message SIB4 or SIB5 (corresponding to the same-frequency or different-frequency neighbor cell reselection related parameters) into EPC or 5GC core network identification (the core network which can be used for distinguishing neighbor cell connection is 4G or 5G; corresponding to the core network identification indication information); specifically, the alternative modes of introduction are as follows (alternatively used):

1) Adding a binary bit (corresponding to a specific implementation example of the added bit) in the broadcast field, and supporting to distinguish LTE (corresponding to the 4G base station) connection 5GC from EPC, for example, setting the binary bit to correspond to connetedto5gc=tune (i.e. to5 gc=true), if the first value is taken, it represents LTE (4G base station) connection 5GC (i.e. OPTION5; the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information), otherwise (for example, the second value) represents that the LTE (4G base station) is connected to EPC (i.e., OPTION1; the core network identification information of the neighboring cell corresponding to the value information is other core network identification information).

2) The core network to which the neighbor cell is connected is determined according to different PLMN configurations (corresponding to the core network identification indication information including: PLMN configuration information corresponding to core network identification information), specifically: by differentiating PLMN configurations, the supporting base station configures different PLMNs for LTE (4G base station) connection 5GC and EPC (i.e., connects different PLMNs for 5GC and connection EPC configuration), and the PLMNs of LTE (4G base station) and 5G (5G base station) are different; PLMN configuration information corresponding to the 4G base station connection 4G core network is different from PLMN configuration information corresponding to the 4G base station connection 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.

(3) And finally, the terminal supporting the operation 5 is in an idle state, and PLMN selection can be executed according to the read system messages SIB3 and SIB4 (or SIB 5), so that cell reselection and downlink synchronization are carried out, and the effects of preferentially accessing and residing the target operation 5 neighbor cell are achieved. Specific examples may include: the terminal receives system information broadcast by the network equipment, and performs cell reselection according to the system information under the condition of being in an idle state; the connection priority can be obtained according to SIB3, and the core network identifier (i.e., the core network identifier information) corresponding to the neighbor cell can be obtained according to SIB4 (or SIB 5); and then, cell reselection (i.e. reselection target cell) is performed according to the acquired connection priority and the core network identification.

By the above, the embodiment of the invention specifically provides a scheme for reselecting an idle state terminal cell, which can realize the behavior of optimizing the 5GC core network operation 5 cell when switching (in time) by introducing neighboring cell identifiers (corresponding to the core network identifier indication information) of neighboring cells of the same 4G network (i.e., 4G base station) +different core networks (e.g., EPC and 5 GC) in the broadcast message SIB4 or SIB5 and introducing sub-priorities (corresponding to the cell reselection sub-priorities) of neighboring cells of the same frequency point or different frequency points in the system in the broadcast message SIB 3.

In summary, the scheme provided by the embodiment of the invention can realize the differential reselection of the operation 5 terminal to the neighboring cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the same core network operation 5 neighboring cells, thereby reducing the switching time delay, ensuring the idle state interoperability and ensuring the service continuity.

The embodiment of the invention also provides a cell reselection device, which is applied to the terminal, as shown in fig. 3, and comprises:

a first receiving module 31, configured to receive system information broadcasted by a network device in a target cell;

a first reselection module 32, configured to perform cell reselection according to the system information when the terminal is in an idle state;

The cell reselection device provided by the embodiment of the invention receives the system information broadcast by the network equipment in the target cell; under the condition that the terminal is in an idle state, cell reselection is performed according to the system information; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support and realize the preferable switching to the 5G core network operation 5 cell according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

Wherein the connection priority includes: cell reselection priorities and cell reselection sub-priorities carried by the newly added field; the cell reselection priorities can indicate the priorities of network systems of different frequency bands, and the cell reselection sub-priorities can indicate the priorities of options in the same frequency band; the options include: option 1 and/or option 5; the option 1 corresponds to a case where the 4G base station accesses the 4G core network, and the option 5 corresponds to a case where the 4G base station accesses the 5G core network.

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

The embodiments of the method for cell reselection at the terminal side are applicable to the embodiments of the cell reselection device, and the same technical effects can be achieved.

The embodiment of the invention also provides a cell reselection device, which is applied to network equipment, as shown in fig. 4, and comprises:

a first broadcasting module 41 for broadcasting system information to terminals in a target cell;

The cell reselection device provided by the embodiment of the invention broadcasts system information to the terminal in the target cell; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support the behavior of realizing (terminal) to switch to the 5G core network operation 5 cell preferably according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

The embodiments of the method for cell reselection on the network device side are applicable to the embodiments of the cell reselection device, and the same technical effects can be achieved.

The embodiment of the invention also provides a terminal, as shown in fig. 5, comprising: a processor 51 and a transceiver 52;

the processor 51 is configured to receive, through the transceiver 52, system information broadcast by a network device in a target cell;

The terminal provided by the embodiment of the invention receives the system information broadcast by the network equipment in the target cell; under the condition that the terminal is in an idle state, cell reselection is performed according to the system information; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support and realize the preferable switching to the 5G core network operation 5 cell according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

In an embodiment of the present invention, the connection priority includes: cell reselection priorities and cell reselection sub-priorities carried by the newly added field; the cell reselection priorities can indicate the priorities of network systems of different frequency bands, and the cell reselection sub-priorities can indicate the priorities of options in the same frequency band; the options include: option 1 and/or option 5; the option 1 corresponds to a case where the 4G base station accesses the 4G core network, and the option 5 corresponds to a case where the 4G base station accesses the 5G core network.

The cell reselection sub-priority is carried (or set) in a cell reselection related parameter in the system information.

In the embodiment of the present invention, the core network identifier indication information includes: the value information of the newly added bit aiming at the core network identification information; alternatively, the core network identification indication information includes: public land mobile network PLMN configuration information corresponding to the core network identification information; the PLMN configuration information corresponding to the 4G base station connection 4G core network is different from the PLMN configuration information corresponding to the 4G base station connection 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.

Wherein, the value information indicates that the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information when the newly added bit takes the first value; 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.

The embodiments of the cell reselection method at the terminal side are applicable to the embodiments of the terminal, and the same technical effects can be achieved.

The embodiment of the invention also provides a network device (also referred to as a network side device), as shown in fig. 6, including: a processor 61 and a transceiver 62;

the processor 61 is configured to broadcast system information to terminals in a target cell through the transceiver 62;

The network equipment provided by the embodiment of the invention broadcasts the system information to the terminal in the target cell; the terminal is a terminal supporting the function of accessing the 4G base station into the 5G core network; 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 that of the 4G core network; the method can support the behavior of realizing (terminal) to switch to the 5G core network operation 5 cell preferably according to the broadcasted system information in an idle state; the method can support and realize the differential reselection of the OPTION5 terminal to the adjacent cells connected with different core networks (such as 5GC or EPC), and realize the preferential residence in the OPTION5 adjacent cells of the same core network, thereby reducing the switching time delay during the cell reselection, ensuring the idle state interoperability and ensuring the service continuity; the method and the device well solve the problems that in the prior art, when a terminal supporting option5 performs cell reselection in an idle state, the service continuity is poor and the cell reselection is prolonged.

The embodiments of the method for cell reselection on the network device side are applicable to the embodiments of the network device, and the same technical effects can be achieved.

The embodiment of the invention also provides a readable storage medium, which stores a program, and the program realizes the steps in the cell reselection method at the terminal side when being executed by a processor; alternatively, the program when executed by the processor implements the steps in the cell reselection method on the network device side.

The embodiments of the cell reselection method at the terminal side or the network device side are applicable to the embodiment of the readable storage medium, and the same technical effects can be achieved.

It should be noted that many of the functional components described in this specification have been referred to as modules, in order to more particularly emphasize their implementation independence.

In an embodiment of the invention, the modules may be implemented in software for execution by various types of processors. An identified module of executable code may, for instance, comprise one or more physical or logical blocks of computer instructions which may, for instance, be organized as an object, procedure, or function. Nevertheless, the executables of an identified module need not be physically located together, but may comprise disparate instructions stored in different bits which, when joined logically together, comprise the module and achieve the stated purpose for the module.

Indeed, a module of executable code may be a single instruction, or many instructions, and may even be distributed over several different code segments, among different programs, and across several memory devices. Likewise, operational data may be identified within modules and may be embodied in any suitable form and organized within any suitable type of data structure. The operational data may be collected as a single data set, or may be distributed over different locations including over different storage devices.

Where a module may be implemented in software, taking into account the level of existing hardware technology, a module may be implemented in software, and one skilled in the art may, without regard to cost, build corresponding hardware circuitry, including conventional Very Large Scale Integration (VLSI) circuits or gate arrays, and existing semiconductors such as logic chips, transistors, or other discrete components, to achieve the corresponding functions. A module may also be implemented in programmable hardware devices such as field programmable gate arrays, programmable array logic, programmable logic devices or the like.

While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and changes can be made without departing from the principles of the present invention, and such modifications and changes should also be considered as being within the scope of the present invention.

Claims

1. A cell reselection method applied to a terminal, comprising:

receiving system information broadcast by network equipment in a target cell;

2. The cell reselection method of claim 1, wherein the connection priority comprises: cell reselection priorities and cell reselection sub-priorities carried by the newly added field;

The options include: option 1 and/or option 5;

3. The cell reselection method of claim 1, wherein the core network identification indication information comprises: the value information of the newly added bit aiming at the core network identification information; or alternatively, the process may be performed,

4. The cell reselection method of claim 3, wherein the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information when the value information indicates that the newly added bit takes a first value; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information;

5. A cell reselection method applied to a network device, comprising:

broadcasting system information to a terminal in a target cell;

6. The cell reselection method of claim 5, wherein the connection priority comprises: cell reselection priorities and cell reselection sub-priorities carried by the newly added field;

the options include: option 1 and/or option 5;

7. The cell reselection method of claim 5, wherein the core network identification indication information comprises: the value information of the newly added bit aiming at the core network identification information; or alternatively, the process may be performed,

8. The cell reselection method of claim 7, wherein the core network identification information of the neighboring cell corresponding to the value information is 5G core network identification information when the value information indicates that the newly added bit takes a first value; otherwise, the core network identification information of the neighboring cell corresponding to the value information is other core network identification information;

9. A cell reselection apparatus, applied to a terminal, comprising:

10. A cell reselection apparatus for use in a network device, comprising:

11. A terminal, comprising: a processor and a transceiver;

12. A network device, comprising: a processor and a transceiver;

13. A terminal comprising a memory, a processor and a program stored on the memory and executable on the processor; a cell reselection method as claimed in any one of claims 1 to 4, wherein the processor when executing the program.

14. A network device comprising a memory, a processor, and a program stored on the memory and executable on the processor; a cell reselection method according to any one of claims 5 to 8, wherein the processor when executing the program.

15. A readable storage medium having stored thereon a program, which when executed by a processor, implements the steps of the cell reselection method of any of claims 1 to 4; or alternatively, the process may be performed,

The program when executed by a processor performs the steps in the cell reselection method of any one of claims 5 to 8.