CN109309947B

CN109309947B - Method for indicating terminal to access core network, method for accessing core network, base station and terminal

Info

Publication number: CN109309947B
Application number: CN201710619898.4A
Authority: CN
Inventors: 马玥; 鲍炜; 吴昱民
Original assignee: Vivo Mobile Communication Co Ltd
Current assignee: Vivo Mobile Communication Co Ltd
Priority date: 2017-07-26
Filing date: 2017-07-26
Publication date: 2021-04-27
Anticipated expiration: 2037-07-26
Also published as: CN109309947A

Abstract

The embodiment of the invention provides a method for indicating a terminal to access a core network, a method for accessing the core network, a base station and a terminal, which are used for solving the problem of how to access a proper core network by UE when the base station is connected with a plurality of core networks, and the method for indicating the terminal to access the core network comprises the following steps: determining a target core network which can be accessed by a terminal from at least two types of core networks connected with a base station; and sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network to which the terminal should be accessed is indicated, so that the resource consumption caused by blind access of the terminal is reduced.

Description

Method for indicating terminal to access core network, method for accessing core network, base station and terminal

Technical Field

The present invention relates to the field of communications technologies, and in particular, to a method, a base station, and a terminal for indicating a terminal to access a core network, and access the core network.

Background

3GPP(3^rdRadio Access Network (RAN) in Generation Partnership Project (third Generation Partnership Project) mainly defines two evolution directions of a 5G system, namely, LTE (evolved LTE) and 5G NR (new air interface system). eLTE refers to air interface LTE access to NGC (5G core network). There are a number of deployment possibilities for LTE, such as: LTE base station simultaneous connection EPC (4G core network) and NGC, LTE only connects NGC or LTE base station only connects EPC.

In LTE, a base station accesses one or one core network, that is, one base station may access different core networks, but NAS (non-access stratum) types supported by a plurality of core networks accessed by the base station are consistent. When accessing, a UE (User Equipment) can automatically select a suitable core network.

When eLTE is connected with EPC and NGC, the UE needs to support 4G and 5G NAS simultaneously, and in the access process, the UE may not know how to access a proper core network because a base station is connected with a plurality of core networks.

In addition, functional characteristics supported by the EPC and the NGC are not consistent, and there is a case where after the UE completes the authentication access of the core network, it finds that the characteristics required by itself are not supported by the current network, and at this time, the UE needs to be guided to a suitable network, but there is no such mechanism at present.

Disclosure of Invention

The embodiment of the invention provides a method for indicating a terminal to access a core network, a method for accessing the core network, a base station and a terminal, which aim to solve the problem of how to access a proper core network by UE when the base station is connected with a plurality of core networks.

In a first aspect, an embodiment of the present invention provides a method for indicating a terminal to access a core network, where the method is applied to a base station, and includes:

determining a target core network which can be accessed by a terminal from at least two types of core networks connected with a base station;

and sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network.

In a second aspect, an embodiment of the present invention provides a method for a terminal to access a core network, where the method is applied to the terminal and includes:

receiving indication information sent by a base station, wherein the indication information carries a target core network which is determined by the base station and can be accessed by a terminal from at least two types of core networks connected with the base station;

and performing access processing according to the indication information and the target core network.

In a third aspect, an embodiment of the present invention provides a base station, including:

a first determining module, configured to determine a target core network accessible to a terminal from at least two types of core networks connected to a base station;

a first sending module, configured to send an indication message to the terminal, where the indication message is used to indicate that the terminal accesses the target core network.

In a fourth aspect, an embodiment of the present invention provides a base station, including: a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the method of instructing a terminal to access a core network as described above.

In a fifth aspect, the present invention 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 of the resource indication method as described above.

In a sixth aspect, an embodiment of the present invention provides a terminal, including:

In a seventh aspect, an embodiment of the present invention provides a terminal, including: a memory, a processor and a computer program stored on the memory and executable on the processor, which computer program, when executed by the processor, performs the steps of the method for a terminal to access a core network as described above.

In an eighth aspect, an embodiment of the present invention provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements the steps of the method for accessing a core network by a terminal as described above.

Thus, in the above technical solution of the embodiment of the present invention, a target core network accessible to a terminal is determined from at least two types of core networks connected to a base station; and sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network to which the terminal should be accessed is indicated, so that the resource consumption caused by blind access of the terminal is reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced 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 that other drawings can be obtained according to these drawings without inventive exercise.

Fig. 1 is a flowchart of a method for instructing a terminal to access a core network according to an embodiment of the present invention;

fig. 2 is an interaction flowchart of a method for instructing a terminal to access a core network according to an embodiment of the present invention;

fig. 3 is a second interaction flowchart of a method for instructing a terminal to access a core network according to an embodiment of the present invention;

fig. 4 is a third interaction flowchart of a method for instructing a terminal to access a core network according to an embodiment of the present invention;

fig. 5 is a fourth interaction flowchart of a method for instructing a terminal to access a core network according to an embodiment of the present invention;

fig. 6 is a flowchart of accessing a terminal to a core network according to an embodiment of the present invention;

fig. 7 is a block diagram of a base station according to an embodiment of the present invention;

fig. 8 is a second block diagram of a base station according to the second embodiment of the present invention;

fig. 9 is a block diagram of a base station according to an embodiment of the present invention;

fig. 10 is one of block diagrams of a terminal according to an embodiment of the present invention;

fig. 11 is a second block diagram of a terminal according to the second embodiment of the present invention;

fig. 12 is a block diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1, an embodiment of the present invention provides a method for indicating a terminal to access a core network, which is applied to a base station, and the method includes:

step 101: a target core network accessible to the terminal is determined from at least two types of core networks connected to the base station.

Here, the core network to which the base station is connected includes, but is not limited to, 4G EPC and 5G NGC. The base station determines a target core network which can be accessed by the terminal from at least two types of core networks so as to facilitate the access of the subsequent terminal.

Step 102: and sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network.

The base station indicates the terminal to access the appropriate core network through the indication information, so that the resource consumption caused by blind access of the terminal is reduced.

Specifically, the indication information includes: a broadcast message, dedicated indication information, fourth message MSG4, or a redirect message.

Wherein, the broadcast message is a system information block SIB message;

when the special indication information is at least one bit;

the at least one bit corresponds to N different states, each state is used for designating at least one core network from at least two types of core networks connected with the base station, and when the state designates at least two core networks, the state also designates the connection priority of the at least two core networks, and N is a positive integer.

The special indication information indicates that when at least two core networks are appointed, the priority of the at least two core networks is also indicated, so that the terminal can know which core network the base station side expects the terminal to access, and further the terminal can access the appropriate core network according to the indication information.

Specifically, the dedicated indication information is a bit;

a first state of the bit indicates that a first core network is designated from at least two types of core networks connected with the base station; a second state of the bit indicates that a second core network is designated from among at least two types of core networks connected to the base station; wherein the first core network and the second core network are of different types.

For example, the value of the variable BOOLEAN can be EPC-available or NGC-available, as indicated by the variable BOOLEAN.

Specifically, when the dedicated indication information is two bits;

the first state of the two bits represents: designating a first core network from at least two types of core networks connected to the base station; a second state of the two bits represents: designating a second core network from at least two types of core networks connected to the base station; the third state of the two bits represents: a first core network and a second core network are designated from at least two types of core networks connected with the base station, and the connection priority of the first core network is higher than that of the second core network; the fourth state of the two bits represents: a first core network and a second core network are designated from at least two types of core networks connected with the base station, and the connection priority of the second core network is higher than that of the first core network.

For example, 01 means that only EPC is supported; 10 means supporting only NGC; 00 denotes that EPC and NGC are supported simultaneously, with EPC first; 11 denotes that EPC and NGC are supported simultaneously, with NGC first.

In the embodiment of the invention, the UE can be explicitly informed of which NAS access is used, when the terminal does not support the selected NAS type, the network side supports various core network types, and can try to initiate the request by using another NAS, but at the moment, the network side can default to route the NAS to a certain core network, and the UE needs to inform the NAS which is not informed by broadcasting when the request is initiated.

The following describes an implementation of the above step 101 with reference to a specific application scenario.

The application scene one: initial access scenario

In this initial access scenario, the network side does not learn the capabilities of the terminal. At this time, the step 102 specifically includes: when the terminal initially accesses a network, a core network designated from among at least two types of core networks connected to the base station is determined as a target core network accessible to the terminal.

Here, when the terminal initially accesses the network, the network side does not learn the capability of the terminal, and at this time, the base station specifies a core network to which the terminal is expected to access as a target core network from among at least two types of core networks connected to the base station. Specifically, the message content in the system information block SIB may be added and set and broadcast to the terminal through a broadcast message, for example, the terminal is instructed to select the EPC or NGC through the SIB1, where TRUE indicates that the EPC is selected, FALSE indicates that the NGC is selected, or TRUE indicates that the NGC is selected, and FALSE indicates that the EPC is selected.

By adding the indication information indicating the type of the core network in the SIB, the UE can conveniently access the appropriate core network.

The terminal learns from the broadcast message which core network the base station indicates the UE to access, and the UE listens to the indication and selects a proper NAS access. The network side can configure the cell to achieve the purposes of load balancing, flexible use of core network resources and the like. It should be noted that if the terminal does not support the core network type of the network broadcast, the terminal may have two options: giving up access; an attempt is made to initiate access with another NAS type, and subsequently a reject-redirect operation is initiated since the radio network side will route the NAS message to the core network broadcast by the radio side.

In this application scenario one, the step 101 may further specifically include:

and determining a target core network accessible to the terminal from at least two types of core networks connected with the base station according to a target message sent by the terminal to a network side in the initial access process.

Here, the target message transmitted by the terminal to the network side in the initial access procedure may include a first message MSG1(preamble sequence preamble), a request message of the terminal (transmitted through MSG 3).

When multiple core networks are connected with the same base station node, due to the fact that functions and NAS protocols supported by the core networks are different, a terminal with two NAS capabilities cannot select a proper network type during access. The invention informs the terminal of the proper network to be accessed through the network indication (broadcast message or specific message indication), thereby reducing the resource consumption caused by blind access of the terminal.

As an optional implementation manner, when the terminal performs initial access, according to the configuration resource used when the terminal sends the first message MSG1, a target core network accessible to the terminal is determined from at least two types of core networks connected to the base station.

Here, the base station determines, according to a correspondence between preset configuration resources and core networks, a core network corresponding to the configuration resources used when the terminal sends the first message, and uses the core network as the target core network, where types of core networks corresponding to different configuration resources in the correspondence are different.

In the specific embodiment of the present invention, the network side may plan a part of preamble resources to use the EPC, and a part of the preamble resources to use the NGC. After acquiring the preamble allocation information through the broadcast message, the terminal can select and send the resource of the MSG1 according to the capability of the terminal, and the network side can judge the NAS available for the terminal according to the preamble used by the terminal and use the NAS type in the subsequent connection establishment process.

As another optional implementation manner, when the terminal performs initial access, a target core network accessible to the terminal is determined from at least two types of core networks connected to the base station according to a request message sent by the terminal.

Specifically, according to a third message MSG3 sent by the terminal in the initial access process, a target core network accessible to the terminal is determined from at least two types of core networks connected to the base station;

the MSG3 carries the core network capability of the terminal or the core network that the terminal desires to select.

Here, the MSG3 carries the core network capability of the terminal or the core network that the terminal desires to select, so that the base station selects a suitable core network for the terminal to access according to the MSG3 message, thereby reducing resource loss caused by blind access of the terminal.

As shown in fig. 2, the application process may specifically include:

step 201: the terminal transmits a preamble sequence to the base station.

Step 202: the terminal receives the MSG2 sent by the base station.

The MSG2 is a random access response RAR.

Step 203: the terminal sends the MSG3 carrying the core network capability of the terminal or the core network that the terminal desires to select to the base station.

Step 204: the base station sends MSG4 to the terminal, and the MSG4 carries the core network selected by the base station for the terminal to access.

Step 205: corresponding NAS information is carried in the MSG5 and is sent to the base station.

In the specific embodiment of the present invention, the initial access in LTE generally adopts a 4-step RACH procedure. MSG1(preamble) -MSG2(RAR) -MSG3-MSG 4. By adding an indication requesting the core network type (which core network can be supported by using a 2bit indication) in the MSG3, the base station side selects a corresponding core network type to be issued in the MSG4 according to the UE capability, the core network connection condition of the base station side, the policy of the base station side and other factors, and after the terminal obtains the core network type, the terminal carries a corresponding NAS message in the MSG5 to complete connection establishment. In addition, if the NAS type supported by the UE is not supported by the eNB, the eNB may reject the UE for access, and indicate that the NAS type does not match in the cause.

Application scenario two: non-initial access scenario

In the non-initial access scenario, the network side knows the UE capabilities.

As an optional implementation manner, the step 101 includes: and determining a target core network which can be accessed by the terminal from at least two types of core networks connected with the base station according to the capability of the terminal.

Specifically, according to a third message MSG3 sent by the terminal in the non-initial access process, the base station obtains the capability information of the terminal from the core network; according to the capability information of the terminal, selecting a core network supported by the terminal from at least two types of core networks connected with the base station as a target core network accessible by the terminal, and informing the terminal through a fourth message MSG 4;

the non-initial access procedure means that the terminal has accessed a core network and still resides in the coverage area of the core network.

Assuming that the UE has made an initial access, the mobility management node MME or 5G core network 5GC has stored terminal capabilities including whether EPC and/or NGC are supported. As shown in fig. 3, the application process may specifically include:

step 301: the terminal transmits a preamble sequence to the base station.

Step 302: the terminal receives the MSG2 sent by the base station.

Step 303: the terminal sends MSG3 to the base station, and the MSG3 carries the core network connection request.

Step 304: and the base station sends a terminal capability acquisition request to the MME or the 5G core network.

Step 305: the MME or 5G core network sends the terminal capabilities.

Step 306: and the base station sends the MSG4 to the terminal according to the terminal capability, wherein the MSG4 carries the core network selected to be accessed by the base station for the terminal.

Here, the network side can indicate NAS to be used by the UE in MSG4, based on the stored terminal capabilities, without requiring the UE to request what NAS type the network should use. In addition, the UE has accessed the network before, MSG3 should carry the UE ID, which is the temporary mobile subscriber identity S-TMSI in the EPC, including the MME ID; in the NGC, a core network CN ID is newly set; therefore, the ID type should be extended in MSG 3. The eNB can distinguish which core network should be used according to the type of CN ID used.

Application scenario three: the UE only needs the characteristics of EPC or NGC

In the third application scenario, as an optional implementation manner, the step 101 includes:

and determining a target core network accessible to the terminal from at least two types of core networks connected with the base station according to the capabilities of the base station and the terminal.

Specifically, according to the core network type carried in the fifth message MSG5 sent by the terminal in the access process, a target core network accessible to the terminal is determined from at least two types of core networks connected to the base station, and the core network type carried in the MSG5 is determined by the terminal according to the capability information of the terminal and the capability of the base station.

Here, since the terminal does not know whether the network side supports EPC and/or NGC NAS, the terminal side selects which NAS access to use may cause a problem of subsequent redirection. The terminal side can only carry corresponding NAS information in the MSG5, and the network side can determine whether the NAS is suitable after receiving the NAS. Improper selection can result in additional signaling flows (deny access + redirect).

As another optional implementation manner, the step 101 includes:

and determining a target core network which can be accessed by the terminal from at least two types of core networks connected with the base station according to the capability of the core network.

Specifically, if a first core network currently accessed by the terminal does not support the service requested by the terminal, selecting a second core network supporting the service requested by the terminal from at least two types of core networks connected to the base station as a target core network accessible by the terminal;

wherein the first core network and the second core network are of different types.

Furthermore, after receiving a redirection message sent by the first core network and redirected to a second core network, the second core network is used as the target core network; or receiving an access failure message sent by a first core network, and selecting a second core network supporting the service requested by the terminal as a target core network accessible by the terminal according to a cause value carried in the access failure message.

In the third application scenario, after the UE accesses the NGC, it is found that the NGC does not support a certain characteristic, but the UE needs to support the certain characteristic, and the EPC has the certain characteristic, so that the network needs to redirect the UE to the EPC.

As shown in fig. 4, a specific application flow of the embodiment of the present invention includes:

step 401: and the terminal sends the NGC NAS message to the 5G core network.

Step 402: and the 5G core network judges that the service requested by the terminal is not supported.

Step 403: and the 5G core network sends the user information migration message to the 4G core network.

Step 404: and the 4G core network sends a user information migration confirmation message to the 5G core network.

Step 405: and sending a redirection message for redirecting to the 4G core network to the base station.

Step 406: the base station informs the UE to use EPC NAS.

The core network EPC and the NGC have an interworking mechanism, know the mutual ability and can complete the user information migration. The NGC needs to inform the EPC to complete the user information transfer process and inform the UE to perform NAS type conversion through the eLTE site.

As shown in fig. 5, another specific application flow of the embodiment of the present invention includes:

step 501: and the terminal sends the NGC NAS message to the 5G core network.

Step 502: and the 5G core network judges that the service requested by the terminal is not supported.

Step 503: the 5G core network rejects or releases the UE and carries a corresponding cause value to the base station.

The value of the cause value may be a newly set non-available service, etc.

Step 504: the base station informs the UE of redirection to the EPC through a redirection message.

Specifically, the base station maps the cause value to the cause value of the rejection or release message of the RAN-side air interface.

Step 505: the UE sends an EPC NAS message to the base station.

Here, the terminal first accesses the 5G core network 5GC, and when the 5GC finds that the service required by the terminal is not suitable for allocation, the UE is rejected (or released), and carries a corresponding cause value (the value of the cause value may be a newly set no available service, etc.), the LTE base station maps the cause value of the NAS to a cause value of a reject/release message of an RAN-side air interface, and notifies the UE to redirect to the EPC (instruct the UE to use the EPC for access), provided that the 5GC knows the capability of the EPC.

In addition, if a certain eLTE eNB has rejected the request of a certain service UE (it can be seen from the terminal capability that the UE needs a certain specific service), the eLTE eNB can directly redirect the UE to a suitable core network without reporting to the core network.

In the third application scenario, the determining, according to the capability of the core network, a target core network accessible to the terminal from at least two types of core networks connected to the base station further includes:

sending services supported by at least two types of core networks connected with the base station to the terminal through a broadcast message; and receiving the core network determined by the terminal according to the broadcast message, and determining the core network determined by the terminal as a target core network accessible to the terminal.

Specifically, a field of a specific service specific (related to the core network) is added to the broadcast message, and by distinguishing different services supported by different core networks, when the UE initiates a service, a suitable core network can be determined according to the network broadcast message. This field may be indicated separately from the core network or jointly.

The method for indicating the terminal to access the core network comprises the steps of determining a target core network which can be accessed by the terminal from at least two types of core networks connected with a base station; and sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network to which the terminal should be accessed is indicated, so that the resource consumption caused by blind access of the terminal is reduced.

As shown in fig. 6, an embodiment of the present invention further provides a method for accessing a core network by a terminal, which is applied to the terminal, and includes:

step 601: receiving indication information sent by a base station, wherein the indication information carries a target core network which is determined by the base station and can be accessed by a terminal from at least two types of core networks connected with the base station.

Here, the base station indicates the terminal to access the appropriate core network through the indication information, so that resource consumption caused by blind access of the terminal is reduced.

Step 602: and performing access processing according to the indication information and the target core network.

Specifically, if the terminal has the capability of supporting the target core network, the terminal accessing the target core network gives up accessing the target core network or initiates accessing to other core networks having different core network types from the target core network if the terminal does not have the capability of supporting the target core network, so that resource consumption caused by blind accessing of the terminal is reduced.

Further, the indication information includes: a broadcast message, dedicated indication information, fourth message MSG4, or a redirect message.

Wherein, the broadcast message is a system information block SIB message;

the special indication information is at least one bit;

wherein the at least one bit corresponds to N different states, each state is used to specify at least one core network from at least two types of core networks connected to the base station, and when the state specifies at least two core networks, the state further specifies a connection priority of the at least two core networks, and N is a positive integer.

As an optional implementation manner, the step 602 specifically includes:

if the special indication information is a bit and the bit is in a first state, accessing a first core network; if the special indication information is a bit and the bit is in a second state, accessing a second core network; wherein the first core network and the second core network are of different types.

Here, the terminal explicitly determines the core network to be accessed according to the state of the bit, so that the resource consumption caused by blind access of the terminal is reduced.

As another optional implementation manner, the step 602 specifically includes:

if the special indication information is two bits and the two bits are in a first state or a third state, accessing a first core network;

and if the special indication information is two bits and the two bits are in a second state or a fourth state, accessing a second core network.

When the dedicated indication information is 01 or 00, the EPC is accessed, and when the dedicated indication information is 10 or 11, the NGC is accessed.

And determining the core network indicated by the base station through the special state information of the bit, and accessing according to the core network indicated by the base station, so that the resource consumption caused by blind access of the terminal is reduced.

Further, before the step 601, the method further includes:

when the terminal initially accesses the network, a target message is sent to the base station, so that the base station determines a target core network according to the target message; or, the fifth message MSG5 in the access process is sent to the base station, so that the base station determines the target core network according to the target message, and the MSG5 carries the core network type determined by the terminal according to the capability information of the terminal and the capability of the base station.

Further, the sending the target message to the base station when the terminal initially accesses the network includes:

when the terminal initially accesses a network, sending a request message of the terminal to a base station; or, when the terminal initially accesses the network, the configuration resource is adopted to send the first message MSG1 to the base station, so that the base station selects a suitable core network for the terminal to access according to the request message or the first message of the terminal.

Further, the sending the first message MSG1 to the base station using the configured resource includes:

selecting configuration resources corresponding to a core network supported by the terminal according to the corresponding relation between preset configuration resources and the core network; and sending the MSG1 to a base station through the selected configuration resource.

And selecting the configuration resource corresponding to the core network supported by the terminal according to the corresponding relation between the preset configuration resource and the core network, and sending the MSG1 to the base station according to the selected configuration resource, so that the base station can obtain the core network capability of the terminal according to the corresponding relation between the preset configuration resource and the core network, and further can select a proper core network for the terminal to access.

Further, the sending the request message of the terminal to the base station when the terminal initially accesses the network includes: and when the terminal performs initial access, sending the third message MSG3 to a base station, where the MSG3 carries core network capability of the terminal or a core network that the terminal desires to select.

Further, the method for accessing the terminal to the core network according to the embodiment of the present invention further includes:

acquiring services which are sent by a base station through broadcast messages and are supported by at least two types of core networks connected with the base station; determining a core network to which the terminal is to access according to services supported by at least two types of core networks connected with the base station; and sending the core network to be accessed by the terminal to a base station.

Here, a field of a specific service specific (related to the core network) is added in the broadcast message, and by distinguishing different services supported by different core networks, when the UE initiates a service, a suitable core network can be determined according to the network broadcast message. This field may be indicated separately from the core network or jointly.

The method for accessing the terminal into the core network of the embodiment of the invention receives the indication information sent by the base station, wherein the indication information carries the target core network which is determined by the base station and can be accessed by the terminal from at least two types of core networks connected with the base station; and performing access processing according to the indication information and the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network is accessed according to the indication information of the base station, so that the resource consumption caused by blind access of the terminal is reduced.

As shown in fig. 7, an embodiment of the present invention further provides a base station 700, including:

a first determining module 701, configured to determine a target core network accessible to a terminal from at least two types of core networks connected to a base station;

a first sending module 702, configured to send an indication information to the terminal, where the indication information is used to indicate that the terminal accesses the target core network.

In the base station of the embodiment of the present invention, the first determining module 701 is configured to determine, when the terminal initially accesses a network, a core network specified from at least two types of core networks connected to the base station as a target core network accessible to the terminal;

or, the base station is configured to determine, according to a target message sent by the terminal to a network side in an initial access process, a target core network accessible to the terminal from at least two types of core networks connected to the base station;

or, the base station is configured to determine, according to the capability of the terminal, a target core network accessible to the terminal from at least two types of core networks connected to the base station;

or, the target core network is determined from at least two types of core networks connected to the base station according to the capability of the core network, where the target core network is accessible to the terminal;

or, the method and the device are used for determining a target core network accessible to the terminal from at least two types of core networks connected with the base station according to the capabilities of the base station and the terminal.

In the base station of the embodiment of the present invention, the first determining module 701 is configured to determine, when the terminal initially accesses, a target core network that the terminal can access from at least two types of core networks connected to the base station according to a configuration resource used when the terminal sends the first message MSG 1;

or, the method and the device are configured to determine, when the terminal performs initial access, a target core network accessible to the terminal from at least two types of core networks connected to the base station according to a request message sent by the terminal.

In the base station of the embodiment of the present invention, the first determining module 701 is configured to determine, according to a correspondence between a preset configuration resource and a core network, the core network corresponding to the configuration resource used when the terminal sends the MSG1, and use the core network as the target core network;

wherein, the types of the core networks corresponding to different configuration resources in the corresponding relationship are different.

In the base station of the embodiment of the present invention, the first determining module 701 is configured to determine, according to a third message MSG3 sent by the terminal in an initial access process, a target core network accessible to the terminal from at least two types of core networks connected to the base station;

In the base station of the embodiment of the present invention, as shown in fig. 8, the first determining module 701 includes:

an obtaining submodule 7011, configured to, according to the third message MSG3 sent by the terminal in the non-initial access process, obtain, by the base station, capability information of the terminal to the core network;

a screening submodule 7012, configured to select, according to the capability information of the terminal, a core network supported by the terminal from at least two types of core networks connected to the base station as a target core network accessible to the terminal.

In the base station of the embodiment of the present invention, the first determining module 701 is configured to select, from at least two types of core networks connected to the base station, a second core network that supports a service requested by the terminal as a target core network to which the terminal can access, if a first core network to which the terminal is currently accessed does not support the service requested by the terminal;

In the base station of the embodiment of the present invention, the first determining module 701 is configured to, after receiving a redirection message that is sent by the first core network and is redirected to a second core network, use the second core network as the target core network.

a receiving submodule 7013, configured to receive an access failure message sent by the first core network;

a selecting submodule 7014, configured to select, according to the cause value carried in the access failure message, a second core network that supports the service requested by the terminal as a target core network accessible by the terminal.

In the base station of the embodiment of the present invention, the first determining module 701 includes:

a first sending submodule 7015, configured to send, through a broadcast message, a service supported by at least two types of core networks connected to the base station to the terminal;

a determining submodule 7016, configured to receive a core network determined by the terminal according to the broadcast message, and determine the core network determined by the terminal as a target core network accessible to the terminal.

In the base station of the embodiment of the present invention, the first determining module 701 is configured to determine, according to a core network type carried in a fifth message MSG5 sent by the terminal in an access process, a target core network accessible to the terminal from at least two types of core networks connected to the base station, where the core network type carried in the MSG5 is determined by the terminal according to its own capability information and a capability of the base station.

In the base station of the embodiment of the present invention, the indication information includes:

a broadcast message, dedicated indication information, fourth message MSG4, or a redirect message.

In the base station of the embodiment of the invention, the broadcast message is a system information block SIB message;

the special indication information is at least one bit;

In the base station of the embodiment of the present invention, the dedicated indication information is a bit;

a first state of the bit indicates that a first core network is designated from at least two types of core networks connected with the base station;

a second state of the bit indicates that a second core network is designated from among at least two types of core networks connected to the base station;

In the base station of the embodiment of the present invention, the dedicated indication information is two bits;

the first state of the two bits represents: designating a first core network from at least two types of core networks connected to the base station;

a second state of the two bits represents: designating a second core network from at least two types of core networks connected to the base station;

the third state of the two bits represents: a first core network and a second core network are designated from at least two types of core networks connected with the base station, and the connection priority of the first core network is higher than that of the second core network;

the fourth state of the two bits represents: a first core network and a second core network are designated from at least two types of core networks connected with the base station, and the connection priority of the second core network is higher than that of the first core network.

It should be noted that the base station is a base station corresponding to the above method embodiment, and all implementation manners in the method embodiment applied to the base station side are applicable to the embodiment of the base station, and the same technical effect can be achieved.

The base station of the embodiment of the invention determines a target core network which can be accessed by a terminal from at least two types of core networks connected with the base station; and sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network to which the terminal should be accessed is indicated, so that the resource consumption caused by blind access of the terminal is reduced.

An embodiment of the present invention further provides a base station, including: the memory, the processor, and the computer program stored in the memory and capable of running on the processor, when executed by the processor, implement each process in the above method embodiment for instructing the terminal to access the core network, and can achieve the same technical effect, and in order to avoid repetition, details are not repeated here.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process in the above method for instructing a terminal to access a core network, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 9, an embodiment of the present invention further provides a base station 900, including a processor 901, a transceiver 902, a memory 903, and a bus interface, wherein:

a processor 901 for reading the program in the memory 903, and executing the following processes:

and sending an indication message to the terminal through the transceiver 902, where the indication message is used to indicate that the terminal accesses the target core network.

In fig. 9, the bus architecture may include any number of interconnected buses and bridges, with one or more processors represented by processor 901 and various circuits of memory represented by memory 903 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 herein. The bus interface provides an interface. The transceiver 902 may be a number of elements including a transmitter and a receiver that provide a means for communicating with various other apparatus over a transmission medium.

The processor 901 is responsible for managing a bus architecture and general processing, and the memory 903 may store data used by the processor 901 in performing operations.

Optionally, the processor 901 reads the program in the memory 903, and is further configured to execute:

when the terminal initially accesses a network, determining a core network designated from at least two types of core networks connected with the base station as a target core network accessible to the terminal;

or, according to a target message sent by the terminal to a network side in an initial access process, determining a target core network accessible to the terminal from at least two types of core networks connected with the base station;

or, according to the capability of the terminal, determining a target core network accessible to the terminal from at least two types of core networks connected with the base station;

or, according to the capability of the core network, determining a target core network accessible to the terminal from at least two types of core networks connected to the base station;

or determining a target core network accessible to the terminal from at least two types of core networks connected with the base station according to the capabilities of the base station and the terminal.

when the terminal initially accesses, determining a target core network which can be accessed by the terminal from at least two types of core networks connected with the base station according to the configuration resource adopted when the terminal sends the first message MSG 1;

or, when the terminal performs initial access, determining a target core network accessible to the terminal from at least two types of core networks connected to the base station according to a request message sent by the terminal.

determining a core network corresponding to the configuration resource adopted when the terminal sends the MSG1 according to the corresponding relation between the preset configuration resource and the core network, and taking the core network as the target core network;

determining a target core network accessible to the terminal from at least two types of core networks connected with the base station according to a third message MSG3 sent by the terminal in the initial access process;

according to a third message MSG3 sent by the terminal in the non-initial access process, the base station acquires the capability information of the terminal from a core network; and selecting a core network supported by the terminal from at least two types of core networks connected with the base station as a target core network accessible by the terminal according to the capability information of the terminal.

if the first core network currently accessed by the terminal does not support the service requested by the terminal, selecting a second core network supporting the service requested by the terminal from at least two types of core networks connected with the base station as a target core network accessible by the terminal;

and after receiving a redirection message which is sent by the first core network and is redirected to a second core network, taking the second core network as the target core network.

receiving an access failure message sent by a first core network;

and selecting a second core network supporting the service requested by the terminal as a target core network accessible by the terminal according to the reason value carried in the access failure message.

sending services supported by at least two types of core networks connected with the base station to the terminal through a broadcast message;

and receiving the core network determined by the terminal according to the broadcast message, and determining the core network determined by the terminal as a target core network accessible to the terminal.

and determining a target core network accessible to the terminal from at least two types of core networks connected with the base station according to the core network type carried in a fifth message MSG5 sent by the terminal in the access process, wherein the core network type carried in the MSG5 is determined by the terminal according to the capability information of the terminal and the capability of the base station.

Optionally, the indication information includes:

Optionally, the broadcast message is a system information block SIB message;

the special indication information is at least one bit;

Optionally, the dedicated indication information is a bit;

Optionally, the dedicated indication information is two bits;

As shown in fig. 10, an embodiment of the present invention further provides a terminal 1000, including:

a receiving module 1001, configured to receive indication information sent by a base station, where the indication information carries a target core network that is determined by the base station and is accessible to a terminal from at least two types of core networks connected to the base station;

an access module 1002, configured to perform access processing according to the indication information and the target core network.

As shown in fig. 11, the access module 1002 includes:

a first access sub-module 10021, configured to access the target core network if the terminal has the capability of supporting the target core network;

a second access sub-module 10022, configured to, if the terminal does not have the capability of supporting the target core network, give up accessing the target core network or initiate access to another core network having a core network type different from that of the target core network.

In the terminal of the embodiment of the present invention, the indication information includes: a broadcast message, dedicated indication information, fourth message MSG4, or a redirect message.

In the terminal of the embodiment of the present invention, the broadcast message is a system information block SIB message;

the special indication information is at least one bit;

In the terminal according to the embodiment of the present invention, the access module 1002 is configured to access a first core network if the dedicated indication information is a bit and the bit is in a first state; if the special indication information is a bit and the bit is in a second state, accessing a second core network;

In the terminal according to the embodiment of the present invention, the access module 1002 is configured to access a first core network if the dedicated indication information is two bits and the two bits are in a first state or a third state; and if the special indication information is two bits and the two bits are in a second state or a fourth state, accessing a second core network.

The terminal of the embodiment of the invention further comprises:

a second sending module 1003, configured to send the target message to the base station when the terminal initially accesses the network; or, the fifth message MSG5 in the access process is sent to the base station, and the MSG5 carries the core network type determined by the terminal according to the capability information of the terminal and the capability of the base station.

In the terminal of the embodiment of the present invention, the second sending module 1003 is configured to send a request message of the terminal to a base station when the terminal initially accesses a network; or, when the terminal initially accesses the network, the terminal sends the first message MSG1 to the base station by using the configured resource.

In the terminal of the embodiment of the present invention, the second sending module 1003 includes:

a selecting submodule 10031 configured to select, according to a correspondence between a preset configuration resource and a core network, a configuration resource corresponding to the core network supported by the terminal;

the second sending submodule 10032 is configured to send the MSG1 to the base station through the selected configuration resource.

In the terminal of the embodiment of the present invention, the second sending module 1003 is configured to send the third message MSG3 to the base station when the terminal performs initial access, where the MSG3 carries a core network capability of the terminal or a core network that the terminal desires to select.

The terminal of the embodiment of the invention further comprises:

an obtaining module 1004, configured to obtain services supported by at least two types of core networks, which are sent by a base station through a broadcast message and connected to the base station;

a second determining module 1005, configured to determine, according to services supported by at least two types of core networks connected to the base station, a core network to which the terminal is to access;

a third sending module 1006, configured to send the core network to which the terminal is to access to the base station.

It should be noted that the terminal is a terminal corresponding to the above method embodiment, and all the implementations in the method embodiment applied to the terminal side are applicable to the embodiment of the terminal, so that the same technical effects can be achieved.

The terminal of the embodiment of the invention receives the indication information sent by the base station, wherein the indication information carries the target core network which can be accessed by the terminal and is determined by the base station from at least two types of core networks connected with the base station; and performing access processing according to the indication information and the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network is accessed according to the indication information of the base station, so that the resource consumption caused by blind access of the terminal is reduced.

An embodiment of the present invention further provides a terminal, including: the processor executes the computer program to implement each process in the above method embodiment for accessing the terminal to the core network, and the same technical effect can be achieved, and further details are not described here to avoid repetition.

The embodiment of the present invention further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements each process in the method embodiment for accessing a terminal to a core network, and can achieve the same technical effect, and is not described herein again to avoid repetition. The computer-readable storage medium may be a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.

As shown in fig. 12, an embodiment of the present invention further provides a terminal, where the terminal 1200 shown in fig. 12 includes: at least one processor 1201, memory 1202, at least one network interface 1204, and other user interfaces 1203. The various components in terminal 1200 are coupled together by a bus system 1205. It is understood that bus system 1205 is used to enable connected communication between these components. Bus system 1205 includes, in addition to a data bus, a power bus, a control bus, and a status signal bus. But for clarity of illustration the various buses are labeled as bus system 1205 in figure 12.

The user interface 1203 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 is to be understood that the memory 1202 in embodiments of the present 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 illustration and 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 Data Rate SDRAM, ddr SDRAM), Enhanced Synchronous SDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and Direct Rambus RAM (DRRAM). The memory 1202 of the systems and methods described herein is intended to comprise, without being limited to, these and any other suitable types of memory.

In some embodiments, memory 1202 stores the following elements, executable modules or data structures, or a subset thereof, or an expanded set thereof: an operating system 12021 and application programs 12022.

The operating system 12021 includes various system programs, such as a framework layer, a core library layer, a driver layer, and the like, and is used for implementing various basic services and processing hardware-based tasks. The application 12022 contains various applications such as a Media Player (Media Player), a Browser (Browser), and the like, and is used to implement various application services. A program implementing a method according to an embodiment of the present invention may be included in the application 12022.

In an embodiment of the present invention, by calling a program or an instruction stored in the memory 1202, specifically a program or an instruction stored in the application 12022, when the computer program is executed by the processor 1201, the following steps are implemented:

Optionally, the computer program when executed by the processor 1201 implements the steps of:

if the terminal has the capability of supporting the target core network, accessing the target core network;

and if the terminal does not have the capability of supporting the target core network, giving up the access to the target core network or initiating the access to other core networks with different core network types from the target core network.

Optionally, the indication information includes: a broadcast message, dedicated indication information, fourth message MSG4, or a redirect message.

Optionally, the broadcast message is a system information block SIB message;

the special indication information is at least one bit;

if the special indication information is a bit and the bit is in a first state, accessing a first core network;

if the special indication information is a bit and the bit is in a second state, accessing a second core network;

when the terminal initially accesses a network, a target message is sent to a base station;

or, the fifth message MSG5 in the access process is sent to the base station, and the MSG5 carries the core network type determined by the terminal according to the capability information of the terminal and the capability of the base station.

when the terminal initially accesses a network, sending a request message of the terminal to a base station;

or, when the terminal initially accesses the network, the terminal sends the first message MSG1 to the base station by using the configured resource.

selecting configuration resources corresponding to a core network supported by the terminal according to the corresponding relation between preset configuration resources and the core network;

and sending the MSG1 to a base station through the selected configuration resource.

and when the terminal performs initial access, sending the third message MSG3 to a base station, where the MSG3 carries core network capability of the terminal or a core network that the terminal desires to select.

acquiring services which are sent by a base station through broadcast messages and are supported by at least two types of core networks connected with the base station;

determining a core network to which the terminal is to access according to services supported by at least two types of core networks connected with the base station;

and sending the core network to be accessed by the terminal to a base station.

In the terminal 1200 of the embodiment of the present invention, the processor 1201 is configured to receive indication information sent by a base station, where the indication information carries a target core network that the base station determines to be accessible to the terminal from at least two types of core networks connected to the base station; and performing access processing according to the indication information and the target core network. According to the embodiment of the invention, when the base station is connected with various types of core networks, the appropriate network is accessed according to the indication information of the base station, so that the resource consumption caused by blind access of the terminal is reduced.

The terminal of the present invention may be a mobile phone, a tablet computer, a Personal Digital Assistant (PDA), or a vehicle-mounted computer, for example.

The terminal 1200 can implement each process implemented by the terminal in the foregoing embodiments, and details are not described here to avoid repetition.

The methods disclosed in the embodiments of the present invention may be applied to the processor 1201, or implemented by the processor 1201. The processor 1201 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the above method may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1201. The Processor 1201 may be a general-purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic device, or discrete hardware components. The various methods, steps and logic blocks disclosed in the embodiments of the present invention may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 1202, and the processor 1201 reads information in the memory 1202 and completes the steps of the above method in combination with hardware thereof.

It is to be understood that the embodiments described herein may be implemented in hardware, software, firmware, middleware, microcode, or any combination thereof. For a hardware implementation, the Processing units may be implemented within one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose processors, controllers, micro-controllers, microprocessors, other electronic units configured to perform the functions described herein, or a combination thereof.

For a software implementation, the techniques described herein may be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The software codes may be stored in a memory and executed by a processor. The memory may be implemented within the processor or external to the processor.

The embodiments in the present specification are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, apparatus, 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, terminal devices (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 terminal to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing terminal, 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 terminal 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 terminal to cause a series of operational steps to be performed on the computer or other programmable terminal to produce a computer implemented process such that the instructions which execute on the computer or other programmable terminal provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.

While the preferred embodiments of the present invention have been described, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims.

Claims

1. A method for indicating a terminal to access a core network is applied to a base station, and is characterized by comprising the following steps:

sending an indication message to the terminal, wherein the indication message is used for indicating the terminal to access the target core network;

the determining a target core network accessible to the terminal from at least two types of core networks connected to the base station includes: determining a target core network which can be accessed by the terminal from at least two types of core networks connected with the base station according to the capability of the core network;

the determining, according to the capability of the core network, a target core network accessible to the terminal from at least two types of core networks connected to the base station includes:

wherein the types of the first core network and the second core network are different;

the selecting, from at least two types of core networks connected to the base station, a second core network supporting a service requested by the terminal as a target core network accessible by the terminal, includes:

receiving an access failure message sent by a first core network;

2. The method of claim 1, wherein the indication information comprises: the message is redirected.

3. A method for accessing a core network by a terminal is applied to the terminal, and is characterized by comprising the following steps:

performing access processing according to the indication information and the target core network;

the base station determines a target core network accessible to a terminal from at least two types of core networks connected with the base station, and the method comprises the following steps:

and the base station receives an access failure message sent by a first core network, and selects a second core network supporting the service requested by the terminal as a target core network accessible by the terminal according to a cause value carried in the access failure message.

4. The method of claim 3, wherein the performing access processing according to the indication information and the target core network comprises:

5. The method for accessing the core network by the terminal according to claim 3, wherein the indication information comprises: the message is redirected.

6. A base station, comprising:

a first sending module, configured to send an indication message to the terminal, where the indication message is used to indicate that the terminal accesses the target core network;

the first determining module is used for determining a target core network which can be accessed by the terminal from at least two types of core networks connected with the base station according to the capability of the core network;

the first determining module is configured to select, from at least two types of core networks connected to the base station, a second core network that supports the service requested by the terminal as a target core network to which the terminal can access, if a first core network to which the terminal is currently accessed does not support the service requested by the terminal;

the first determining module is configured to receive an access failure message sent by a first core network, and select, according to a cause value carried in the access failure message, a second core network that supports a service requested by the terminal as a target core network to which the terminal can access.

7. The base station of claim 6, wherein the indication information comprises: the message is redirected.

8. A base station, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor performs the steps of the method of instructing a terminal to access a core network as claimed in any one of claims 1 to 2.

9. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when being executed by a processor, carries out the steps of the method of instructing a terminal to access a core network according to any one of claims 1 to 2.

10. A terminal, comprising:

a receiving module, configured to receive indication information sent by a base station, where the indication information carries a target core network that is determined by the base station to be accessible to a terminal from at least two types of core networks connected to the base station;

the access module is used for performing access processing according to the indication information and the target core network;

11. The terminal of claim 10, wherein the access module comprises:

the first access sub-module is used for accessing the target core network if the terminal has the capability of supporting the target core network;

and the second access sub-module is used for giving up access to the target core network or initiating access to other core networks with different core network types from the target core network if the terminal does not have the capability of supporting the target core network.

12. The terminal of claim 10, wherein the indication information comprises: the message is redirected.

13. A terminal, comprising: memory, processor and computer program stored on the memory and executable on the processor, which when executed by the processor performs the steps of the method of accessing a core network by a terminal according to any of claims 3 to 5.

14. A computer-readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of a method for a terminal to access a core network according to any one of claims 3 to 5.