CN109756950A

CN109756950A - Select method, user terminal and the network side equipment of core net

Info

Publication number: CN109756950A
Application number: CN201711069903.5A
Authority: CN
Inventors: 刘潇蔓; 陈卓; 杨光; 刘光毅
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Co Ltd
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Co Ltd
Priority date: 2017-11-03
Filing date: 2017-11-03
Publication date: 2019-05-14

Abstract

The embodiment of the present invention provides a kind of method, user terminal and network side equipment for selecting core net, it solves for different ability UE, the problem of network side equipment can select core net for it, this method comprises: determining the core net selection preference or UE ability of user terminal UE；According to the core net that the core net of the UE selects preference and the network side equipment to support, or the core net supported according to the UE ability and the network side equipment, the target core network of the UE access is determined.

Description

Method for selecting core network, user terminal and network side equipment

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method for selecting a core network when a User Equipment (UE) initially attaches, a User terminal, and a network side device.

Background

In the existing mechanism, after a Public Land Mobile Network (PLMN) selection and a cell selection are performed by a UE, a random access is required, and the random access includes a contention-based random access and a non-contention-based random access, where the contention-based random access mainly includes four steps, including: a Random Access Preamble (alternatively referred to as message 1(MSG1)) and a Random Access Response (Random Access Response) (alternatively referred to as message 2(MSG2)), a Transmission schedule (alternatively referred to as message 3(MSG3)), and a Contention Resolution (alternatively referred to as message 4(MSG4)), as shown in fig. 1.

After receiving message 4(MSG4), the UE sends message 5(MSG5) (e.g., RRC (Radio resource control) connection setup complete and attach request including initialized non-access stratum (initial NAS) message), and the base station (Evolved Node B, eNB) sends the initial NAS message to the core network.

According to the third Generation Partnership Project (3 GPP) conclusion, in future networks, there will be situations where multiple Radio Access Technologies (RATs) are associated with the same PLMN (e.g., Long Term Evolution (LTE) and fifth Generation mobile communication Technology (5G) New Radio (New Radio, NR)). In addition, there will also be two forms of UEs, one supporting only Evolved Packet Core (EPC) -NAS and the other supporting both 5G Core network (5GC) -NAS and EPC-NAS, as shown in fig. 2.

However, for UEs with different capabilities (supporting a specific core network or supporting two core networks), how the eNB selects a core network for the UE when performing initial attach is an urgent problem to be solved.

Disclosure of Invention

In view of the foregoing technical problems, embodiments of the present invention provide a method for selecting a core network, a user terminal, and a network side device, which solve the problem that for UEs with different capabilities, the network side device can select a core network for the UEs.

In a first aspect, a method for selecting a core network is provided, where the method is applied to a network side device, and a core network supported by the network side device at least includes: a first core network and a second core network, the method comprising:

determining the core network selection preference or the UE capability of a user terminal UE;

and determining a target core network accessed by the UE according to the core network selection preference of the UE and the core network supported by the network side equipment, or according to the UE capability and the core network supported by the network side equipment.

Optionally, the determining the core network selection preference of the UE includes:

determining core network selection preference of the UE according to a first lead code sent by the UE; or

And determining the core network selection preference of the UE according to a first indicator bit in a first message sent by the UE.

Optionally, the determining, according to the core network selection preference of the UE and the core network supported by the network side device, a target core network to which the UE is accessed includes:

judging whether a first core network supported by the network side equipment to access meets the core network selection preference of the UE;

if a first core network supported by the network side equipment to access meets the core network selection preference of the UE, determining the first core network as a target core network;

and if the first core network supported by the network side equipment to be accessed does not meet the core network selection preference of the UE, determining a second core network supported by the network side equipment to be accessed as a target core network, or sending a rejection indication.

Optionally, the determining, according to the UE capability and the core network supported by the network side device, a target core network to which the UE is accessed includes:

judging whether a first core network supported by the network side equipment meets the UE capability;

if the first core network supported by the network side equipment meets the UE capability, determining the first core network as a target core network;

and if the first core network supported by the network side equipment does not meet the UE capability, determining a second core network supported by the network side equipment as a target core network, or sending a rejection indication.

In a second aspect, a method for selecting a core network is further provided, where the method is applied to a user equipment UE, and the method includes:

sending the core network selection preference or the UE capability of the UE to network side equipment;

sending a second message to the network side equipment;

receiving a third message sent by the network side device, where the third message is used to feed back the second message to the UE and forward the second message to a target core network;

the target core network is determined by the network side device according to the core network selection preference of the UE and the core network supported by the network side device, or determined by the network side device according to the UE capability and the core network supported by the network side device.

Optionally, the sending, to the network side device, the core network selection preference of the UE includes:

sending a first preamble to the network side device, the first preamble corresponding to core network selection preference of the UE; or,

and sending a first message to the network side equipment, wherein a first indication bit in the first message corresponds to the core network selection preference of the UE.

In a third aspect, a method for selecting a core network is further provided, where the method is applied to a network side device, and a core network supported by the network side device at least includes: a third core network and a fourth core network, the method comprising:

receiving a service request sent by User Equipment (UE);

and judging whether to replace a third core network initially accessed by the UE according to the service request.

Optionally, the determining, according to the service request, whether to replace the core network to which the UE accesses includes:

judging whether a third core network initially accessed by the UE meets the service request;

if the third core network initially accessed by the UE meets the service request, the connection between the third core network and the UE is kept;

if the third core network initially accessed by the UE does not meet the service request, disconnecting the third core network and establishing the connection with a fourth core network supported by the network side equipment.

In a fourth aspect, a method for selecting a core network is further provided, where the method is applied to a user equipment UE, and the method includes:

sending a fourth message to the network side equipment, and accessing the UE to a third core network by the network side equipment;

and sending a service request to the network side equipment, and judging whether to replace a third core network initially accessed by the UE by the network side equipment according to the service request.

In a fifth aspect, a method for selecting a core network is further provided, where the method is applied to a network side device, and the method includes:

sending the supporting capability of the network side equipment to a core network and the working state of the network side equipment and each core network interface to User Equipment (UE);

receiving a core network selection result sent by the UE;

and establishing connection with the corresponding core network according to the core network selection result.

Optionally, sending, to the UE, the capability of the network side device to support the core network and the working states of the network side device and each core network interface, includes:

sending a broadcast message to the UE, wherein a second indication bit in the broadcast message corresponds to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface, or,

and sending a fifth message to the UE, wherein a third indication bit in the fifth message corresponds to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface.

Optionally, the receiving the core network selection result sent by the UE includes:

receiving a second lead code sent by the UE, wherein the second lead code corresponds to a core network selection result of the UE; or,

and receiving a sixth message sent by the UE, wherein a fourth indication bit in the sixth message corresponds to a core network selection result of the UE.

In a sixth aspect, a method for selecting a core network is further provided, where the method is applied to a user equipment UE, and the method includes:

receiving the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface, which are sent by the network side equipment;

determining a core network selection result according to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface;

and sending the core network selection result to the network side equipment.

Optionally, receiving the core network support capability of the network side device and the working states of the network side device and each core network interface sent by the network side device includes:

receiving a broadcast message, wherein a second indication bit in the broadcast message corresponds to the support capability of the network side device to the core network and the working state of the network side device and each core network interface, or,

and receiving a fifth message sent by the network side equipment, wherein a third indication bit in the fifth message corresponds to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface.

Optionally, the sending the core network selection result to the network side device includes:

sending a second preamble to the network side device, where the second preamble corresponds to a core network selection result of the UE; or,

and sending a sixth message to the network side equipment, wherein a fourth indication bit in the sixth message corresponds to a core network selection result of the UE.

A seventh aspect further provides a network side device, where a core network supported by the network side device at least includes: a first core network and a second core network, comprising: a first processor and a first transceiver;

the first processor is to: determining the core network selection preference or the UE capability of a user terminal UE;

the first processor is further configured to: and determining a target core network accessed by the UE according to the core network selection preference of the UE and the core network supported by the network side equipment, or according to the UE capability and the core network supported by the network side equipment.

Optionally, the first processor is further configured to:

if the first core network supported by the network side device to access does not meet the core network selection preference of the UE, determining a second core network supported by the network side device to access as a target core network, or indicating the first transceiver to send a rejection indication.

Optionally, the first processor is further configured to:

In an eighth aspect, there is further provided a user equipment UE, including: a second processor and a second transceiver, wherein,

the second transceiver is to: sending the core network selection preference or the UE capability of the UE to network side equipment;

the second transceiver is further configured to: sending a second message to the network side equipment;

the second transceiver is further configured to: receiving a third message sent by the network side device, where the third message is used to feed back the second message to the UE and forward the second message to a target core network;

Optionally, the second transceiver is further configured to:

In a ninth aspect, a network side device is further provided, where a core network supported by the network side device at least includes: a third core network and a fourth core network comprising: a third processor and a third transceiver, wherein,

the third transceiver is to: receiving a service request sent by User Equipment (UE);

the third processor is to: and judging whether to replace a third core network initially accessed by the UE according to the service request.

Optionally, the third processor is further configured to:

if the third core network initially accessed by the UE meets the service request, indicating the third transceiver to maintain the connection with the third core network;

if the third core network initially accessed by the UE does not meet the service request, disconnecting the third core network, and indicating the third transceiver to establish connection with a fourth core network supported by the network side equipment.

In a tenth aspect, there is further provided a UE, including: a fourth processor and a fourth transceiver, wherein,

the fourth transceiver is to: sending a fourth message to the network side equipment, and accessing the UE to a third core network by the network side equipment;

the fourth transceiver is further configured to: and sending a service request to the network side equipment, and judging whether to replace a third core network initially accessed by the UE by the network side equipment according to the service request.

In an eleventh aspect, there is also provided a network side device, including: a fifth processor and a fifth transceiver, wherein,

the fifth transceiver is to: sending the supporting capability of the network side equipment to a core network and the working state of the network side equipment and each core network interface to User Equipment (UE);

the fifth transceiver is further to: receiving a core network selection result sent by the UE;

the fifth processor is to: and indicating the fifth transceiver to establish connection with the corresponding core network according to the core network selection result.

Optionally, the fifth transceiver is further configured to:

Optionally, the fifth transceiver is further for

In a twelfth aspect, a user equipment UE is further provided, including: a sixth processor and a sixth transceiver, wherein,

the sixth transceiver is to: receiving the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface, which are sent by the network side equipment;

the sixth processor is configured to: determining a core network selection result according to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface;

the sixth transceiver is further configured to: and sending the core network selection result to the network side equipment.

Optionally, the sixth transceiver is further configured to:

In a thirteenth aspect, a network-side device is further provided, including: a memory, a processor, a transceiver and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the method of selecting a core network as described in the first when executing the program; or implementing the steps in the method for selecting a core network according to the third aspect, or implementing the steps in the method for selecting a core network according to the fifth aspect.

In a fourteenth aspect, there is further provided a user terminal, including: a memory, a processor, a transceiver and a computer program stored on the memory and executable on the processor, the processor implementing the steps in the method of selecting a core network according to the second, fourth or sixth aspect when executing the program.

In a fifteenth aspect, there is also provided a computer readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the steps in the method of selecting a core network according to the first, second, third, fourth, fifth or sixth aspect.

Therefore, in the embodiment of the invention, the UE directly feeds back the core network selection preference or the UE capability of the UE to the network side equipment, and the network side equipment determines the target core network according to the core network selection preference or the UE capability of the UE, thereby improving the random access success rate.

Drawings

Fig. 1 is a schematic diagram of a contention-based random access procedure;

FIG. 2 is a schematic diagram of a conventional network architecture;

FIG. 3 is a block diagram of a wireless communication system according to an embodiment of the present invention;

fig. 4 is a flowchart of a method for selecting a core network according to an embodiment of the present invention;

fig. 5 is a second flowchart of a method for selecting a core network according to an embodiment of the present invention;

fig. 6 is a third flowchart of a method for selecting a core network according to an embodiment of the present invention;

fig. 7 is a fourth flowchart of a method for selecting a core network according to an embodiment of the present invention;

fig. 8 is a fifth flowchart of a method for selecting a core network according to an embodiment of the present invention;

fig. 9 is a sixth flowchart of a method for selecting a core network according to an embodiment of the present invention;

fig. 10 is a seventh flowchart of a method of selecting a core network according to an embodiment of the present invention;

fig. 11 is an eighth flowchart of a method of selecting a core network according to an embodiment of the present invention;

fig. 12 is a ninth flowchart of a method for selecting a core network according to an embodiment of the present invention;

FIG. 13 is a diagram of a network device according to an embodiment of the present invention

FIG. 14 is a diagram illustrating a UE according to an embodiment of the present invention;

FIG. 15 is a second block diagram of a network device according to an embodiment of the present invention

FIG. 16 is a second block diagram of a UE according to the embodiment of the present invention;

FIG. 17 is a third block diagram of a network device according to an embodiment of the present invention

FIG. 18 is a third block diagram of a UE according to an embodiment of the present invention;

fig. 19 is a fourth block diagram of a network device according to an embodiment of the present invention;

FIG. 20 is a fourth block diagram of a UE according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.

The term "and/or" herein is merely an association describing an associated object, meaning that three relationships may exist, e.g., a and/or B, may mean: a exists alone, A and B exist simultaneously, and B exists alone.

The terms "first" and "second," and the like, in the description and in the claims of embodiments of the present invention are used for distinguishing between different objects and not for describing a particular order of the objects. For example, the first indication bit and the second indication bit, etc. are used to distinguish different indication bits, rather than to describe a specific order of the indication bits.

In the embodiments of the present invention, words such as "exemplary" or "for example" are used to mean serving as examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.

Embodiments of the present invention are described below with reference to the accompanying drawings. The method for selecting the core network, the user terminal and the network side equipment provided by the embodiment of the invention can be applied to a wireless communication system. The wireless communication system may be a system adopting a 5th generation (5G) mobile communication technology (hereinafter, referred to as a 5G system), and fig. 3 is a schematic diagram of an architecture of a wireless communication system according to an embodiment of the present invention. As shown in fig. 3, the wireless communication system may include a network side device 30 and a user terminal, for example, denoted as UE31, where UE31 may communicate with network side device 30. In practical applications, the connections between the above devices may be wireless connections, and fig. 3 illustrates solid lines for convenience and intuition of the connection relationships between the devices.

It should be noted that the communication system may include a plurality of UEs, and the network side device may communicate (transmit signaling or transmit data) with the plurality of UEs.

The network side device provided in the embodiment of the present invention may be a base station, and the network side device may be a commonly used base station, an evolved node base station (eNB), or a network side device in a 5G system (for example, a next generation base station (gNB) or a Transmission and Reception Point (TRP)).

The user terminal provided by the embodiment of the invention can be a Mobile phone, a tablet Computer, a notebook Computer, an Ultra-Mobile Personal Computer (UMPC), a netbook or a Personal Digital Assistant (PDA), and the like.

Referring to fig. 4, a flow of the method for selecting a core network is shown in the figure, where an execution subject is a network side device, and a core network supported by the network side device at least includes: the method comprises the following steps of:

step 401, determining a core network selection preference or a UE capability of the UE;

the above-mentioned core network selection preference of the UE is used to indicate a preference of the UE to select to access the core network, for example, a preference to select a first core network or a preference to select a second core network, or no preference to access the core network.

The above-mentioned UE capability (UE category) is a set of radio performance parameters that are variable in uplink or downlink. The UE capabilities include a number of radio characteristics, including for example which core network is selected.

In step 401, the network side device may determine the core network selection preference of the UE according to the following manner:

mode 1, according to a first preamble sent by a UE, determining a core network selection preference of the UE, where the first preamble corresponds to the core network selection preference of the UE, for example, a first preamble of a first type indicates that a second core network is selected, a first preamble of a second type indicates that the second core network is selected, a first preamble of a third type indicates that network side device management is obeyed, and the UE has no preference for an access core network. The first preamble may be carried in the MSG1, but it should be noted that the carrying manner of the first preamble is not limited in the embodiment of the present invention.

Mode 2, according to a first indicator bit in a first message sent by the UE, determining a core network selection preference of the UE. The first message may be MSG3 or MSG5, the bit number of the first indicator bit is 1bit, if the UE knows that the network side device only supports one core network or supports two core networks but only has a normal interface (for example, NG1 or S1) with a certain core network, the UE may generate a corresponding NAS message, the first indicator location is null, or the UE performs cell reselection to select a cell supporting another network system; if the UE knows that the network side equipment supports two core networks and the interfaces of the network side equipment and the two core networks are normal, the first indicator bit is 1, which indicates that the core network selection preference is 5G NGC; the first indicating bit is 0, which indicates that the core network selection preference is LTE EPC; the first indication position is empty, which represents the selection preference of the UE without the core network, and the network side equipment can process the selection preference by itself.

In step 401, the network side device may determine the UE capability according to the following manner:

in the mode 1, the network side equipment initiates a capability request to the UE, and the UE sends the UE capability to the network side equipment.

Mode 2, the UE accesses the network side device, and the network side device has acquired the UE capability.

And 3, before the initial access, the UE sends the UE capability to the network side equipment.

Step 402, determining a target core network accessed by the UE according to the core network selection preference of the UE and the core network supported by the network side equipment, or according to the UE capability and the core network supported by the network side equipment.

Mode 1, a target core network is determined based on core network selection preferences of a UE.

The specific mode is as follows: judging whether a first core network supported by the network side equipment to access meets the core network selection preference of the UE; if the first core network supported by the network side equipment to access meets the core network selection preference of the UE, determining the first core network as a target core network; and if the first core network supported by the network side equipment to be accessed does not meet the core network selection preference of the UE, determining a second core network supported by the network side equipment to be accessed as a target core network, or sending a rejection indication to the UE.

Mode 2, the target core network is determined based on the UE capability selection preference.

The specific mode is as follows: judging whether a first core network supported by network side equipment meets the UE capability; if the first core network supported by the network side equipment meets the UE capability, determining the first core network as a target core network; and if the first core network supported by the network side equipment does not meet the UE capability, determining a second core network supported by the network side equipment as a target core network, or sending a rejection indication to the UE.

Referring to fig. 5, a flow of a method for selecting a core network is shown, where an execution subject of the method is UE, and the specific steps are as follows:

step 501, sending core network selection preference or UE capability of UE to network side equipment;

In step 501, the UE may send the core network selection preference of the UE to the network side device by:

mode 1, sending a first preamble to a network side device, where the first preamble corresponds to a core network selection preference of the UE; the first preamble corresponds to a core network selection preference of the UE, for example, the first preamble of the first type indicates that a first type of core network is selected, the first preamble of the second type indicates that a second type of core network is selected, the first preamble of the third type indicates that network side device management is obeyed, and the UE has no preference for the accessed core network.

Mode 2, a first message is sent to the network side device, and a first indication bit in the first message corresponds to the core network selection preference of the UE. The first message may be MSG3 or MSG5, the bit number of the first indicator bit is 1bit, if the UE knows that the network side device only supports one core network or supports two core networks but only has a normal interface (for example, NG1 or S1) with a certain core network, the UE may generate a corresponding NAS message, the first indicator location is null, or the UE performs cell reselection to select a cell supporting another network system; if the UE knows that the network side equipment supports two core networks and the interfaces of the network side equipment and the two core networks are normal, the first indicator bit is 1, and the core network selection preference is NGC; the first indicating bit is 0, which indicates that the core network selection preference is LTE EPC; the first indication position is empty, which represents the selection preference of the UE without the core network, and the network side equipment can process the selection preference by itself.

Step 502, sending a second message to the network side device;

the second message may be a NAS message.

Step 503, receiving a third message sent by the network side device, where the third message is used to feed back a second message to the UE and forward the second message to the target core network;

the target core network is determined by the network side equipment according to the core network selection preference of the UE and the core network supported by the network side equipment, or determined by the network side equipment according to the UE capability and the core network supported by the network side equipment.

Referring to fig. 6, a flow of a method for selecting a core network is shown in the figure, where an execution subject of the method is a network side device, and a core network supported by the network side device at least includes: the third core network and the fourth core network specifically comprise the following steps:

step 601, receiving a service request sent by UE;

the service request may be a request for a service supported by the third core network, or may be a service request supported by the fourth core network, and in the embodiment of the present invention, a specific type of the service request is not limited.

It should be noted that, before step 601, the network side device accesses the UE to a third core network, where the third core network is a default core network that needs to be accessed by the UE.

Step 602, according to the service request, determining whether to replace a third core network initially accessed by the UE.

The specific mode is as follows: judging whether a third core network initially accessed by the UE meets a service request; if the third core network initially accessed by the UE meets the service request, the connection between the third core network and the UE is kept; if the third core network initially accessed by the UE does not meet the service request, disconnecting the third core network and establishing the connection with a fourth core network supported by the network side equipment.

For example: UE initiates a certain service, network side equipment receives a service request and then judges whether a default core network initially accessed by the UE can meet the service requirement, the core network initially accessed by the UE is assumed to be LTE EPC, the service of the UE is related to Slicing and needs to be accessed to 5G NGC, and the network side equipment initiates a core network switching process to the UE: and disconnecting the connected core network, forwarding the NAS message to another core network, and completing the processes of core network registration and the like.

Therefore, the core network which is accessed by the UE in a default mode is set, the core network is changed when service requirements exist, and the access flow is simplified.

Referring to fig. 7, a flow of a method for selecting a core network is shown, where an execution subject of the method is UE, and the specific steps are as follows:

step 701, sending a fourth message to the network side device, and accessing the UE to a third core network by the network side device;

the fourth message may be a NAS message; the third core network is a core network which is accessed by the UE by default.

Step 702, sending a service request to the network side device, and the network side device determining whether to replace the third core network initially accessed by the UE according to the service request.

Referring to fig. 8, a flowchart of a method for selecting a core network is shown, where an execution subject is a network side device, and the specific steps are as follows:

step 801, sending the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface to the UE;

the support capability of the network side device for the core network is used for indicating which core network the network side device supports.

The working states of the network side equipment and each core network interface are used for indicating that the interfaces are normal or abnormal.

Mode 1, sending a broadcast message to the UE, where a second indication bit in the broadcast message corresponds to a support capability of the network side device for the core network and an operating state of an interface between the network side device and each core network, and a bit number of the second indication bit may be 2 bits, which is not limited to this.

In the mode 2, a fifth message (for example, MSG2 or MSG4) is sent to the UE, where a third indication bit in the fifth message corresponds to the support capability of the network side device on the core network and the working state of the network side device and each core network interface, and the bit number of the third indication bit may be 2 bits, which is not limited to this.

Step 802, receiving a core network selection result sent by the UE;

mode 1, receiving a second preamble sent by the UE, where the second preamble corresponds to a core network selection result of the UE. For example, the first type of second preamble indicates that the core network selection result is LTE EPC, and the second type of second preamble indicates that the core network selection result is 5G NGC, but the invention is not limited thereto.

And in the mode 2, a sixth message sent by the UE is received, a fourth indication bit in the sixth message corresponds to a core network selection result of the UE, and the bit number of the third indication bit may be 1bit, which is certainly not limited thereto.

And step 803, establishing the connection with the corresponding core network according to the core network selection result.

Therefore, the network side equipment informs the UE whether the core network supported by the UE and the corresponding core network interface work normally or not, and avoids repeatedly initiating access.

Referring to fig. 9, a flow of the method for selecting a core network is shown, where an execution subject is a UE, and the specific steps are as follows:

step 901, receiving the support capability of the network side device to the core network and the working state of the network side device and each core network interface sent by the network side device;

mode 1, receiving a broadcast message, where a second indication bit in the broadcast message corresponds to a support capability of the network side device for a core network and a working state of an interface between the network side device and each core network, and a bit number of the second indication bit may be 2 bits, which is not limited thereto;

and in a mode 2, receiving a fifth message (for example, MSG2 or MSG4) sent by the network side device, where a third indication bit in the fifth message corresponds to the core network support capability of the network side device and the working state of each interface between the network side device and each core network, and the bit number of the third indication bit may be 2 bits, which is not limited to this.

Step 902, determining a core network selection result according to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface;

step 903, sending the core network selection result to the network side equipment.

Mode 1, sending a second preamble to a network side device, where the second preamble corresponds to a core network selection result of the UE; for example, the first type of second preamble indicates that the core network selection result is LTE EPC, and the second type of second preamble indicates that the core network selection result is 5G NGC, but the invention is not limited thereto.

And in a mode 2, a sixth message (MSG3 or MSG5) is sent to the network side device, where a fourth indicating bit in the sixth message corresponds to a core network selection result of the UE, and the bit number of the third indicating bit may be 1bit, but is not limited thereto.

If the UE learns the core network support capability of the network side device and the working states of the network side device and each core network interface through a broadcast mode, the UE may feed back the core network selection result through the preamble, or the MSG5 carries a third indication bit to indicate the core network selection result.

If the UE knows the support capability of the network side device for the core network and the working state of the network side device and each core network interface through MSG2 or MSG4, the UE may indicate the core network selection result by carrying a third indication bit through MSG3 or MSG 5.

Referring to fig. 10, a flow of selecting a core network is shown, and the specific steps are as follows:

step 1001, the UE sends core network selection preference or UE capability to the eNB;

and after the UE enters the coverage range of the eNB, initiating a random access and initial attachment process. The eNB does not broadcast the support capabilities for the core network. The eNB may obtain the core network selection preference of the UE in one of several ways:

the method a: the UE selects different preambles, for example, the preambles are classified, the first type of Preamble represents selection of LTE EPC, the second type of Preamble represents selection of 5G NGC, the third type of Preamble represents obedience of eNB management, and no preference is given to an accessed core network;

mode b: an indicator bit of a predetermined bit (bit) (e.g., 1bit) is carried in an upstream message (e.g., message 3(MSG3) or message 5(MSG5)), which indicates core network selection preference. For example:

if the UE knows that the eNB supports only one core network or supports two core networks but the interface (for example, NG1 or S1) with only one core network is normal, the UE may generate a corresponding NAS message indicating that the location is empty, or the UE performs cell reselection and selects a cell supporting another network system;

if the UE knows that the eNB supports the two core networks and the interfaces of the eNB and the two core networks are normal, the indication bit is 1, and the core network selection preference is NGC; the indication bit is 0, which indicates that the core network selection preference is LTE EPC; and indicating that the position is empty, indicating that the UE has no core network selection preference and the eNB can process the preference by itself.

Mode c: the eNB initiates a capability request to the UE, or the UE has accessed the eNB, for which the eNB selects a core network according to the UE capabilities.

Mode d: before initial access, the UE sends UE capabilities to the eNB.

Step 1002, the UE sends an NAS message to the eNB;

step 1003, the eNB judges whether core network selection preference selection or UE capability of the UE is met;

step 1004, the eNB sends a feedback message of NAS message forwarding and core network selection to the UE.

The eNB obtains the core network selection preference or the UE capability of the UE, if the eNB supports the core network selected by the access UE or the core network supported by the eNB can meet the UE capability requirement, the NAS message of the UE is forwarded to the corresponding core network, and initial attachment is completed; otherwise, the eNB will:

a) sending a rejection indication to the UE, e.g. eNB only supports core networks different from the core network selection preference of the UE, assuming that the core network selection preference of e.g. the UE is NGC, while the eNB only works normally with the interface of the EPC;

b) and forwarding the NAS message of the UE to another core network, and sending a change instruction to the UE. For example: the eNB only supports a core network with different preference from that of the UE, supposing that the preference of the UE for the core network selection is NGC, the interfaces of the eNB, the ECP and the NGC both work normally, and the NAS message of the UE is forwarded to the ECP.

It should be noted that the NAS message is carried in MSG5, and may be a single message with MSG 2.

Referring to fig. 11, a flow of a method for selecting a core network is shown, and the specific steps are as follows:

step 1101, the UE sends an NAS message to the eNB;

the eNB sets a default access core network for the served UE, e.g. all UEs initially access the EPC by default and cache NAS messages for the UE.

Step 1102, the UE sends a service request to the eNB;

step 1103, the eNB determines whether to replace the core network to which the UE accesses according to the service request;

for example: UE initiates a certain service, eNB receives the service request and then judges whether the default core network initially accessed by the UE can meet the service requirement, if the core network initially accessed by the UE is LTE EPC, the service of the UE is related to Slicing and needs to be accessed to 5G NGC, eNB initiates the core network switching process to the UE: and disconnecting the connected core network, forwarding the NAS message to another core network, and completing the processes of core network registration and the like.

Referring to fig. 12, a flow of a method for selecting a core network is shown, and the specific steps are as follows:

step 1201, the UE acquires the support capability of the eNB on the core network and the working state of the eNB and each core network interface;

the UE obtains the support capability of the eNB to the core network and the related information between the eNB and each core network interface, and may specifically adopt the following modes:

mode a, eNB broadcast:

for example, an indication bit is added to certain system information to indicate whether the eNB and the core network interface are currently operating normally. The following takes the indication bit as 2 bits as an example:

if the indicating bit does not carry any value, the interfaces NG1 and S1 are normal;

if the indicating bit is 10, the NG1 interface is normal, and the S1 interface is abnormal;

if the indication bit is 01, the interface S1 is normal, the interface NG1 is abnormal, and the situation includes that the eNB can be simultaneously accessed to the EPC and the NGC, only the EPC interface is normal, and the situation that the eNB can be only accessed to the EPC and S1 is normal;

if the indicator bit is 00, it indicates that both the NG1 interface and the S1 interface are abnormal, which includes the case where the eNB can simultaneously access the EPC and the NGC, and both the S1 and the NG1 interface are abnormal, and also includes the case where the eNB can only access the EPC and S1 is abnormal.

Mode b, dedicated signaling:

an indicator bit is added to a downlink message (e.g., MSG2 or MSG4 for random access) indicating the support capability for the core network and whether the eNB and core network interface is currently operating properly. The following takes the indication bit as 2 bits as an example:

if the indicator bit does not carry any value, it indicates that the NG1 and S1 interfaces are normal;

if the indication bit is 01, it indicates that the S1 interface is normal, and the NG1 interface is abnormal, which includes the case where the eNB can simultaneously access the EPC and the NGC and only the EPC interface is normal, and the case where the eNB can only access the EPC and S1 is normal.

If the indicator bit is 00, it indicates that both NG1 and SI interfaces are abnormal, which includes the case where the eNB can access the EPC and the NGC simultaneously, and both S1 and NG1 interfaces are abnormal, and also includes the case where the eNB can only access the EPC and S1 is abnormal.

Step 1202, the UE sends a core network selection result to the eNB;

and the UE feeds back a core network selection result and a corresponding NAS message according to the acquired support capability of the eNB on the core network and the working state of the interface.

The method a: if the support capability and the interface condition of the eNB on the core network are acquired in a broadcasting mode, the core network selection result can be fed back in the following mode:

(1) selecting different preambles, for example, classifying the preambles, wherein the first type of Preamble represents that the core network selection result is the LTE EPC, and the second type of Preamble represents that the core network selection result is the 5G NGC;

(2) an indicator bit representing the core network selection result is carried in an uplink message (e.g., MSG 5).

If the UE knows that the eNB only supports one core network or supports two core networks but only has a normal interface (NG1 or S1) with one core network, the UE can generate a corresponding NAS message to indicate that the position is empty, or the UE performs cell reselection to select a cell supporting another system;

if the UE knows that the eNB supports two core networks and the interfaces between the eNB and the two core networks are normal, for example: the indication bit is 1, which indicates that the 5G NGC is to be accessed; the indication bit is 0, which indicates that EPC is accessed; if the indicated location is empty, it means that the UE has no preference and the eNB can handle it by itself.

Mode b: if the UE knows the support capability and interface condition of the eNB to the core network through a downlink message (such as MSG2 or MSG4), an indicator bit representing the selection result of the core network is carried in the uplink message (such as MSG3 or MSG 5).

if the UE knows that the eNB supports the two core networks and the interfaces of the eNB and the two core networks are normal, for example, the indication bit is 1, which indicates that the 5G NGC is to be accessed; the indication bit is 0, which indicates that EPC is accessed; if the indicated location is empty, it means that the UE has no preference and the eNB can handle it by itself.

Step 1203, the eNB forwards the NAS message to a corresponding core network;

for example: the eNB may determine to which core network the NAS information is sent according to the type of Preamble or according to an indication bit carried in an uplink message (e.g., MSG5) by the UE, so as to complete subsequent access operations.

The following describes embodiments of the present invention with reference to specific scenarios:

scene 1: the UE reads the broadcast message, knows that the eNB supports both LTE EPC and 5G NGC, and the interfaces with the core network are normal, the UE initiates a Random Access Channel (RACH) process, and in MSG5, the eNB sends NAS information to the 5G NGC, wherein the RACH process indicates a position 1 selected by the core network.

Scene 2: the UE reads the broadcast message, knows that the eNB supports both the LTE EPC and the 5G NGC, and the interfaces with the core network are normal, the UE initiates an RACH process to select a Preamble representing the LTE, the eNB knows the core network selection result of the UE after receiving the Preamble, and transfers the NAS message to the LTE EPC after receiving the NAS message carried by the MSG 5.

Scene 3: the UE initiates a RACH process, when receiving the MSG2 sent by the eNB, the UE learns that the eNB supports both the LTE EPC and the 5GNGC, but the interface between the eNB and the LTE EPC is abnormal, the UE generates an NAS message and sends the NAS message to the eNB in the MSG5, and the eNB forwards the NAS message to the 5G NGC.

Scene 4: UE initiates RACH process, when receiving MSG2 sent by eNB, UE knows that eNB supports both LTE and NR, and the interfaces of eNB and core network are normal, UE generates NAS message and sends to eNB in MSG5, and the indication position of MSG5 is empty, eNB sends to a certain core network (LTE EPC or 5G NGC) after receiving.

Scene 5: and the UE reads the broadcast message, knows that the eNB supports both the LTE EPC and the 5G NGC, but the interface with the 5G NGC is abnormal, and initiates cell reselection.

Scene 6: and the eNB learns that the UE supports sliding according to the UE capability and forwards an NAS message sent in the initial attachment of the UE to the 5GNGC by combining the working state of an interface between the eNB and a core network.

Referring to fig. 13, a structure of a network side device is shown, where a core network supported by the network side device 1300 at least includes: a first core network and a second core network, the network side device 1300 includes: a first processor 1301 and a first transceiver 1302;

the first processor 1301 is configured to: determining the core network selection preference or the UE capability of a user terminal UE;

the first processor 1301 is further configured to: and determining a target core network accessed by the UE according to the core network selection preference of the UE and the core network supported by the network side equipment, or according to the UE capability and the core network supported by the network side equipment.

In this embodiment of the present invention, optionally, the first processor 1301 is further configured to: determining core network selection preference of the UE according to a first lead code sent by the UE; or determining the core network selection preference of the UE according to the first indicator bit in the first message sent by the UE.

In this embodiment of the present invention, optionally, the first processor 1301 is further configured to: judging whether a first core network supported by the network side equipment to access meets the core network selection preference of the UE; if a first core network supported by the network side equipment to access meets the core network selection preference of the UE, determining the first core network as a target core network; and if the first core network supported by the network side equipment to be accessed does not meet the core network selection preference of the UE, determining a second core network supported by the network side equipment to be accessed as a target core network, or sending a rejection indication.

In this embodiment of the present invention, optionally, the first processor 1301 is further configured to: judging whether a first core network supported by the network side equipment meets the UE capability; if the first core network supported by the network side equipment meets the UE capability, determining the first core network as a target core network; if the first core network supported by the network side equipment does not meet the UE capability, determining a second core network supported by the network side equipment as a target core network, or sending a rejection indication, or indicating a first transceiver to send the rejection indication.

Referring to fig. 14, which shows a structure of a UE1400, the UE includes: a second processor 1401 and a second transceiver 1402, wherein,

the second transceiver 1402 is configured to: sending the core network selection preference or the UE capability of the UE to network side equipment;

the second transceiver 1402 is further configured to: sending a second message to the network side equipment;

the second transceiver 1402 is further configured to: receiving a third message sent by the network side device, where the third message is used to feed back the second message to the UE and forward the second message to a target core network;

In this embodiment of the present invention, optionally, the second transceiver 1402 is further configured to: sending a first preamble to the network side device, the first preamble corresponding to core network selection preference of the UE; or sending a first message to the network side device, where a first indication bit in the first message corresponds to the core network selection preference of the UE.

Referring to fig. 15, a structure of a network side device is shown, where a core network supported by the network side device 1500 at least includes: a third core network and a fourth core network, the network side device 1500: a third processor 1501 and a third transceiver 1502, wherein,

the third transceiver 1502 is configured to: receiving a service request sent by User Equipment (UE);

the third processor 1501 is configured to: and judging whether to replace a third core network initially accessed by the UE according to the service request.

In this embodiment of the present invention, optionally, the third processor 1501 is further configured to: judging whether a third core network initially accessed by the UE meets the service request; if the third core network initially accessed by the UE meets the service request, indicating the third transceiver to maintain the connection with the third core network; if the third core network initially accessed by the UE does not meet the service request, disconnecting the third core network, and indicating the third transceiver to establish connection with a fourth core network supported by the network side equipment.

Referring to fig. 16, the structure of a UE is shown, the UE 1600: a fourth processor 1601, and a fourth transceiver 1602, wherein,

the fourth transceiver 1602 is configured to: sending a fourth message to the network side equipment, and accessing the UE to a third core network by the network side equipment;

the fourth transceiver 1602 is further configured to: and sending a service request to the network side equipment, and judging whether to replace a third core network initially accessed by the UE by the network side equipment according to the service request.

Referring to fig. 17, a structure of a network side device is shown, where the network side device 1700 includes: a fifth processor 1701 and a fifth transceiver 1702, wherein,

the fifth transceiver 1702 is configured to: sending the supporting capability of the network side equipment to a core network and the working state of the network side equipment and each core network interface to User Equipment (UE);

the fifth transceiver 1702 is further configured to: receiving a core network selection result sent by the UE;

the fifth processor 1701 is configured to: and indicating the fifth transceiver to establish connection with the corresponding core network according to the core network selection result.

In this embodiment of the present invention, optionally, the fifth transceiver 1702 is further configured to:

Referring to fig. 18, there is shown a structure of a UE1800 including: a sixth processor 1801 and a sixth transceiver 1802, wherein,

the sixth transceiver 1802 is configured to: receiving the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface, which are sent by the network side equipment;

the sixth processor 1801 is configured to: determining a core network selection result according to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface;

the sixth transceiver 1802 is further configured to: and sending the core network selection result to the network side equipment.

In this embodiment of the present invention, optionally, the sixth transceiver 1802 is further configured to:

An embodiment of the present invention provides a network side device, and fig. 19 is a schematic structural diagram of the network side device provided in the embodiment of the present invention. As shown in fig. 19, the network-side device 1900 includes: a processor 1901, a transceiver 1902, a memory 1903, and a bus interface.

Among other things, the processor 1901 may be responsible for managing the bus architecture and general processing. The memory 1903 may store data used by the processor 1901 in performing operations.

In this embodiment of the present invention, the network-side device 1900 may further include: a computer program stored on the memory 1903 and executable on the processor 1901, the computer program when executed by the processor 1901 performing the steps of: determining the core network selection preference or the UE capability of a user terminal UE; and determining a target core network accessed by the UE according to the core network selection preference of the UE and the core network supported by the network side equipment, or according to the UE capability and the core network supported by the network side equipment.

Alternatively, the computer program when executed by the processor 1901 implements the steps of: receiving a service request sent by User Equipment (UE); and judging whether to replace a third core network initially accessed by the UE according to the service request.

Alternatively, the computer program when executed by the processor 1901 implements the steps of: sending the supporting capability of the network side equipment to a core network and the working state of the network side equipment and each core network interface to User Equipment (UE); receiving a core network selection result sent by the UE; and establishing connection with the corresponding core network according to the core network selection result.

In the figure, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 1901 and various circuits of memory represented by memory 1903 being linked together. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further in connection with embodiments of the present invention. The bus interface provides an interface. The transceiver 1902 may be a plurality of elements including a transmitter and a receiver providing a means for communicating with various other apparatus over a transmission medium.

The processor 1901 is responsible for managing the bus architecture and general processing, and the memory 1903 may store data used by the processor 1901 in performing operations.

As shown in fig. 20, the user terminal 2000 shown in fig. 20 includes: at least one processor 2001, memory 2002, at least one network interface 2004, and a user interface 2003. The various components in the user terminal 2000 are coupled together by a bus system 2005. It can be appreciated that bus system 2005 is used to enable connected communication between these components. The bus system 2005 includes a power bus, a control bus, and a status signal bus, in addition to a data bus. For clarity of illustration, however, the various buses are labeled as bus system 2005 in fig. 20.

The user interface 2003 may include, among other things, a display, a keyboard, or a pointing device (e.g., a mouse, trackball, touch pad, or touch screen, among others.

It will be appreciated that the memory 2002 in embodiments of the invention may be either volatile memory or nonvolatile memory, or may include both volatile and nonvolatile memory. The non-volatile Memory may be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically Erasable PROM (EEPROM), or a flash Memory. Volatile Memory can be Random Access Memory (RAM), which acts as external cache Memory. By way of example, but not limitation, many forms of RAM are available, such as Static random access memory (Static RAM, SRAM), Dynamic Random Access Memory (DRAM), Synchronous Dynamic random access memory (Synchronous DRAM, SDRAM), Double data rate Synchronous Dynamic random access memory (ddr DRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchronous link SDRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 2002 of the systems and methods described in this embodiment of the invention is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 2002 holds the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 20021 and application programs 20022.

The operating system 20021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, for implementing various basic services and processing hardware-based tasks. The application 20022 includes various applications, such as a Media Player (Media Player), a Browser (Browser), and the like, for implementing various application services. A program implementing the method of an embodiment of the present invention may be included in application 20022.

In the embodiment of the present invention, by calling the program or instruction stored in the memory 2002, specifically, the program or instruction stored in the application 20022, the following steps are implemented when executing: sending the core network selection preference or the UE capability of the UE to network side equipment; sending a second message to the network side equipment; receiving a third message sent by the network side device, where the third message is used to feed back the second message to the UE and forward the second message to a target core network; the target core network is determined by the network side device according to the core network selection preference of the UE and the core network supported by the network side device, or determined by the network side device according to the UE capability and the core network supported by the network side device.

Or, when executed, implement the steps of: sending a fourth message to the network side equipment, and accessing the UE to a third core network by the network side equipment; and sending a service request to the network side equipment, and judging whether to replace a third core network initially accessed by the UE by the network side equipment according to the service request.

Or, when executed, implement the steps of: receiving the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface, which are sent by the network side equipment; determining a core network selection result according to the support capability of the network side equipment to the core network and the working state of the network side equipment and each core network interface; and sending the core network selection result to the network side equipment.

An embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the steps in the method for selecting a core network as described above.

The steps of a method or algorithm described in connection with the disclosure herein may be embodied in hardware or in software instructions executed by a processor. The software instructions may consist of corresponding software modules that may be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disk, a removable hard disk, a compact disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. Of course, the storage medium may also be integral to the processor. The processor and the storage medium may reside in an ASIC. Additionally, the ASIC may reside in a core network interface device. Of course, the processor and the storage medium may reside as discrete components in a core network interface device.

Those skilled in the art will recognize that, in one or more of the examples described above, the functions described in this invention may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present invention should be included in the scope of the present invention.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, embodiments of the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, embodiments of the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various changes and modifications may be made in the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims

1. A method for selecting a core network is applied to a network side device, and the core network supported by the network side device at least comprises: a first core network and a second core network, the method comprising:

2. The method of claim 1, wherein determining the core network selection preference of the UE comprises:

3. The method of claim 1, wherein the determining a target core network accessed by the UE according to the core network selection preference of the UE and the core networks supported by the network-side device comprises:

4. The method of claim 1, wherein the determining a target core network to which the UE accesses according to the UE capability and core networks supported by the network-side device comprises:

5. A method for selecting a core network is applied to a User Equipment (UE), and is characterized in that the method comprises the following steps:

sending a second message to the network side equipment;

6. The method of claim 5, wherein the sending the core network selection preference of the UE to the network side device comprises:

7. A method for selecting a core network is applied to a network side device, and the core network supported by the network side device at least comprises: a third core network and a fourth core network, the method comprising:

receiving a service request sent by User Equipment (UE);

8. The method of claim 7, wherein the determining whether to change the core network accessed by the UE according to the service request comprises:

9. A method for selecting a core network is applied to a User Equipment (UE), and is characterized in that the method comprises the following steps:

10. A method for selecting a core network is applied to a network side device, and is characterized in that the method comprises the following steps:

receiving a core network selection result sent by the UE;

11. The method of claim 10, wherein sending, to the UE, the core network support capability of the network-side device and the working status of each interface between the network-side device and each core network comprises:

12. The method of claim 10, wherein the receiving the core network selection result sent by the UE comprises:

13. A method for selecting a core network is applied to a User Equipment (UE), and is characterized in that the method comprises the following steps:

and sending the core network selection result to the network side equipment.

14. The method according to claim 13, wherein receiving the core network support capability of the network-side device and the working status of each interface between the network-side device and each core network, which are sent by the network-side device, comprises:

15. The method according to claim 13, wherein the sending the core network selection result to the network side device includes:

16. A network side device, a core network supported by the network side device at least includes: a first core network and a second core network, comprising: a first processor and a first transceiver;

17. The network-side device of claim 16, wherein the first processor is further configured to:

18. The network-side device of claim 16, wherein the first processor is further configured to:

19. The network-side device of claim 16, wherein the first processor is further configured to:

20. A user terminal, UE, comprising: a second processor and a second transceiver, wherein,

21. The UE of claim 20, wherein the second transceiver is further configured to:

22. A network side device, a core network supported by the network side device at least includes: a third core network and a fourth core network, comprising: a third processor and a third transceiver, wherein,

23. The network-side device of claim 22, wherein the third processor is further configured to:

24. A UE, comprising: a fourth processor and a fourth transceiver, wherein,

25. A network-side device, comprising: a fifth processor and a fifth transceiver, wherein,

26. The network-side device of claim 25, wherein the fifth transceiver is further configured to:

27. The network-side device of claim 25, wherein the fifth transceiver is further configured to

28. A user terminal, UE, comprising: a sixth processor and a sixth transceiver, wherein,

29. The UE of claim 28, wherein the sixth transceiver is further configured to:

30. The UE of claim 28, wherein the sixth transceiver is further configured to:

31. A network-side device, comprising: memory, processor, transceiver and computer program stored on the memory and executable on the processor, the processor implementing the steps in the method of selecting a core network according to any one of claims 1 to 4 when executing the program; or implementing the steps in a method of selecting a core network as claimed in any one of claims 7 to 8, or implementing the steps in a method of selecting a core network as claimed in any one of claims 10 to 12.

32. A user terminal, comprising: memory, processor, transceiver and computer program stored on the memory and executable on the processor, the processor implementing the steps in the method of selecting a core network according to any one of claims 5 to 6 when executing the program; or implementing the steps in the method of selecting a core network according to claim 9, or implementing the steps in the method of selecting a core network according to any one of claims 13 to 15.

33. A computer-readable storage medium, on which a computer program is stored, which program, when executed by a processor, carries out the steps in the method of selecting a core network according to any one of claims 1 to 4; or implementing the steps in a method of selecting a core network as claimed in any one of claims 5 to 6; or implementing the steps in the method for selecting a core network according to any one of claims 7 to 8, implementing the steps in the method for selecting a core network according to claim 9; or implementing the steps in a method of selecting a core network as claimed in any one of claims 10 to 12, or implementing the steps in a method of selecting a core network as claimed in any one of claims 13 to 15.