CN108696910B

CN108696910B - Method, device and storage medium for selecting target base station

Info

Publication number: CN108696910B
Application number: CN201710233624.1A
Authority: CN
Inventors: 陈斯; 李旭
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-04-11
Filing date: 2017-04-11
Publication date: 2020-10-09
Anticipated expiration: 2037-04-11
Also published as: WO2018188557A1; CN108696910A

Abstract

A method, an apparatus and a storage medium for selecting a target base station are provided, which are used for selecting a better target base station for a terminal in a network slice instance application scenario. In the embodiment of the application, a source base station determines a target base station to be switched by a terminal from M adjacent base stations according to the signal quality of the M adjacent base stations, the information of network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example. Therefore, the target base station is selected by considering the signal quality of the adjacent base station and the information of the network slice example on the adjacent base station, so that the selected target base station can better adapt to the application scene of the network slice example.

Description

Method, device and storage medium for selecting target base station

Technical Field

Embodiments of the present invention relate to the field of communications, and in particular, to a method, an apparatus, and a storage medium for selecting a target base station.

Background

A terminal of Long Term Evolution (LTE) adopts a terminal-assisted network control idea in a switching process between base stations, specifically, a source base station issues measurement control to the terminal, the terminal measures signal quality of adjacent base stations and reports the signal quality of each adjacent base station, and the source base station determines that the terminal is switched from the source base station to a target base station with better signal quality when determining that the signal quality of the adjacent base stations is greater than the signal quality of the source base station according to the signal quality of each adjacent base station reported by the terminal.

With the advent of Network Function Virtualization (NFV), Network functions can be built on general purpose hardware, rather than on dedicated hardware platforms. The advent of NFV makes it possible for operators to build different virtual networks for different network traffic needs. A virtual network built for different network traffic needs is referred to as a network slice instance. Wherein, each network function can be optimized and customized according to the network service requirement. The network slice example based on the NFV technology can be rapidly deployed according to requirements so as to rapidly meet the requirements of different scenes. In future 5G communication systems, however, a logic-based resource allocation technique, i.e., network slice instance, will be adopted, and is not limited to specific physical resources.

However, currently, the terminal still adopts the strategy in LTE when switching between the source base station and the target base station, that is, the source base station determines the target base station according to the signal quality of the neighboring base station to realize the switching of the terminal, so that the terminal cannot be better adapted to the application scenario of the network slice example.

Disclosure of Invention

The embodiment of the application provides a method, a device and a storage medium for selecting a target base station, which are used for selecting a better target base station for a terminal in a network slice example application scene.

In a first aspect, an embodiment of the present application provides a method for selecting a target base station, where the method includes: if the source base station determines that the terminal needs to perform base station switching, the source base station determines a target base station to be switched from the M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; wherein M is a positive integer; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example.

The source base station is the target base station selected according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal, so that the signal quality of the adjacent base stations and the information of the network slice examples on the adjacent base stations are considered when the target base station is selected, and the selected target base station can better adapt to the application scene of the network slice examples. Furthermore, the problem that the selected target base station is not matched with the information of the network slice example of the terminal can be avoided.

The network slice example in the embodiment of the application is a collection of physical and logical resources. The information of the network slice instance of any one of the source base station, the target base station, or the neighboring base station in the embodiment of the present application specifically refers to information of the network slice instance in the network slice instances included in the base station. In the embodiment of the present application, what is gone on the network slice instance is a service, and the information of the network slice instance corresponding to the terminal refers to the information of the network slice instance corresponding to the service used by the terminal.

Optionally, before the source base station determines, according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, a target base station to which the terminal needs to be switched from the M neighboring base stations, the method further includes: the source base station receives the information of the network slice examples of the M adjacent base stations in a wired or wireless mode; and broadcasts information of the network slice instance of the source base station in a wired or wireless form. In an optional scheme, if the base stations are connected by adopting Xn ports in a wired mode, the base stations can preferentially select the Xn ports to broadcast the information of the network slice examples of the base stations, and therefore time and labor can be saved; if the Xn interface between the base stations is not opened, the base stations can broadcast the information of the network slice examples thereof through the air interface. This may enable the base station to obtain information of network slice instances of neighboring base stations.

Optionally, in this embodiment of the present application, the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes, but is not limited to: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example. For example, the information of each network slice instance may directly include the service type and quality of service level of the network slice instance; an identification of the network slice instance may also be included, and the traffic type and quality of service level may be ascertained from the identification of the network slice instance.

In an optional embodiment, N quasi-target base stations exist in M neighboring base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the method for determining a target base station to be switched by a terminal from M adjacent base stations by a source base station according to the signal quality of the M adjacent base stations, the information of network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal comprises the following steps: if the quasi-target base station with the information of the network slice instance matched with the information of the network slice instance corresponding to the terminal does not exist, the method comprises the following steps: for each quasi-target base station in the N quasi-target base stations, determining from the information of the network slice example included in the quasi-target base station: the information of the network slice instance with the highest similarity to the information of the network slice instance corresponding to the terminal, and the similarity between the information of the network slice instance with the highest similarity and the information of the network slice instance corresponding to the terminal; determining a target base station to be switched by the terminal from the N quasi-target base stations according to the corresponding similarity of each quasi-target base station; the similarity between the information of the network slice instance of the quasi-target base station and the information of the network slice instance corresponding to the terminal is determined according to the parameter type and the parameter value of the parameter of the network slice instance included in the information of the two network slice instances. In this way, when there is no quasi-target base station whose information of the network slice instance matches the information of the network slice instance corresponding to the terminal, the network slice instance with the highest similarity can be selected for reconfiguration, so that the parameter items changed in the reconfiguration process of the network slice instance are as few as possible, and the change range of the parameter value is as small as possible, thereby further accelerating the reconfiguration rate.

In order to improve reconfiguration efficiency, an optional embodiment of determining a target base station to which a terminal needs to be switched from N quasi-target base stations according to a similarity corresponding to each quasi-target base station includes: and in the N quasi-target base stations: determining the quasi-target base station with the highest similarity as a target base station; after determining a target base station to be switched by the terminal from the N quasi-target base stations according to the corresponding similarity of each quasi-target base station, the method further comprises the following steps: sending a network slice example reconfiguration request to a quasi-target base station with the highest similarity in the N quasi-target base stations; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; if the reconfiguration of the network slice example is determined to fail, the network slice example reconfiguration request is sent to the quasi-target base stations except the quasi-target base station which has sent the reconfiguration request of the network slice example in the N quasi-target base stations: the quasi-target base station with the highest similarity sends a network slice instance reconfiguration request until a network slice instance reconfiguration success response is received; re-determining the quasi-target base station corresponding to the received network slice instance reconfiguration success response as the target base station; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to perform reconfiguration operation on the network slice instance included in the quasi-target base station, so that the reconfigured network slice instance is compatible with the information of the network slice instance corresponding to the terminal.

Optionally, in order to improve the probability of success of reconfiguration and improve the reliability of terminal handover, multiple preparations may be performed, and optionally, according to the similarity corresponding to each quasi-target base station, the method for determining the target base station to which the terminal needs to be handed over from the N quasi-target base stations includes: to N quasi-target base stations: each quasi-target base station in P quasi-target base stations with the similarity sequenced from high to low at the front P positions sends a network slice instance reconfiguration request; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; p is a positive integer not greater than N; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to carry out reconfiguration operation on the network slice instance included by the quasi-target base station so as to enable the reconfigured network slice instance to be compatible with the information of the network slice instance corresponding to the terminal; and if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received, determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response.

Accordingly, one of the quasi-target base stations that received the network slice instance reconfiguration success response may be found as the target base station, or a plurality of the quasi-target base stations may be found as the target base stations for improving reliability. Optionally, if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received, determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response, including: if network slice instance reconfiguration success responses respectively returned by each quasi-target base station in the L quasi-target base stations in the P are received, then: determining a quasi-target base station with the optimal service performance after the terminal is accessed in the L quasi-target base stations as a target base station; l is a positive integer not greater than P.

In order to ensure the shortest time delay, another optional scheme is that, if a network slice instance reconfiguration success response returned by one base station of the P quasi-target base stations is received, the quasi-target base station corresponding to the earliest received network slice instance reconfiguration success response is determined as the target base station, and a reconfiguration cancel command is sent to the remaining P-1 quasi-target base stations in the P quasi-target base stations; wherein the reconfiguration cancel command is used to cause the remaining P-1 quasi-target base stations to cancel the reconfiguration operation on the network slice instance.

Optionally, N quasi-target base stations exist in the M neighbor base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the method for determining a target base station to be switched by a terminal from M adjacent base stations by a source base station according to the signal quality of the M adjacent base stations, the information of network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal comprises the following steps: if K quasi-target base stations which match the information of the network slice example with the information of the network slice example corresponding to the terminal exist, then: determining K quasi-target base stations with the information of the network slice example matched with the information of the network slice example corresponding to the terminal as target base stations; wherein K is a positive integer not greater than N.

Optionally, after determining a target base station to which the terminal needs to be switched from the M neighboring base stations, the method further includes: a source base station sends a switching request to a target base station; the switching request comprises information of a network slice example corresponding to the terminal; the source base station receives a switching response returned by the target base station; the switching response comprises information of a network slice example to be accessed of the terminal; the network slice example indicated by the information of the network slice example to be accessed is as follows: and the service carried by the network slice instance indicated by the information of the network slice instance corresponding to the compatible terminal. Therefore, the process of switching the terminal to the target base station is realized, and the terminal is accessed into the network slice instance which can be compatible with the information of the network slice instance corresponding to the terminal in the target base station, so that the uninterrupted terminal service is ensured.

In a second aspect, an embodiment of the present application provides an apparatus for selecting a target base station, where the apparatus for selecting a target base station includes a memory, a transceiver, and a processor, where: the memory is used for storing instructions; the processor is configured to control the transceiver to perform signal reception and signal transmission according to instructions stored in the execution memory, and when the processor executes the instructions stored in the execution memory, the apparatus for selecting a target base station is configured to perform any one of the methods of the first aspect or the first aspect.

In a third aspect, an embodiment of the present application provides an apparatus for selecting a target base station, configured to implement any one of the foregoing first aspect or the first aspect, where the apparatus includes corresponding functional modules, which are respectively configured to implement the steps in the foregoing methods.

In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having instructions stored therein, which when executed on a computer, cause the computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, embodiments of the present application provide a computer program product containing instructions that, when executed on a computer, cause the computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In the embodiment of the application, if the source base station determines that the terminal needs to perform base station switching, a target base station to be switched by the terminal is determined from the M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example. The source base station is the target base station selected according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal, so that the signal quality of the adjacent base stations and the information of the network slice examples on the adjacent base stations are considered when the target base station is selected, and the selected target base station can better adapt to the application scene of the network slice examples.

Drawings

Fig. 1 is a schematic architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a flowchart illustrating a method for selecting a target base station according to an embodiment of the present application;

fig. 2a is a schematic diagram of information of an example network slice provided in an embodiment of the present application;

fig. 2b is a schematic diagram of an example parameter of a network slice according to an embodiment of the present application;

fig. 2c is a schematic diagram of information of an example of a network slice maintained by a base station according to an embodiment of the present application;

fig. 2d is a flowchart illustrating a method for selecting a target base station according to an embodiment of the present application;

FIG. 2e is a flowchart illustrating a method for selecting a target base station based on FIG. 2 d;

FIG. 2f is a flowchart illustrating a method for selecting a target base station based on FIG. 2 d;

fig. 2g is a schematic flowchart of a method for selecting a target base station and performing terminal handover according to an embodiment of the present disclosure;

fig. 2h is a schematic flowchart of a method for selecting a target base station and switching a terminal according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of an apparatus for selecting a target base station according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of an apparatus for selecting a target base station according to an embodiment of the present disclosure.

Detailed Description

Fig. 1 shows a schematic architecture diagram of a communication system to which embodiments of the present application are applied. As shown in fig. 1, the communication system 100 may include a terminal 105, and a plurality of base stations, in this embodiment, a base station to which the terminal 105 currently accesses is referred to as a source base station 101, and a base station to which the terminal 105 can receive signals although the terminal 105 does not currently access is referred to as a neighboring base station, such as a neighboring base station 102, a neighboring base station 103, and a neighboring base station 104. The terminal 105 and the base station may be connected by a wireless connection or other means. If the source base station determines that the terminal needs to perform base station switching, the source base station may select a target base station for the terminal from the neighboring base stations, so that the terminal is switched from the source base station to the target base station, thereby providing various services for the terminal through the target base station. Any one of the source base station, the neighbor base station, and the target base station in the embodiments of the present application may also be referred to as one cell.

Various aspects are described herein in connection with a terminal and/or a base station. A terminal, a device (device) that provides voice and/or data connectivity to a user, including a wireless terminal. The wireless terminal may be a handheld device having wireless connection capabilities, or other processing device connected to a wireless modem, a mobile terminal communicating with one or more core networks via a radio access network. For example, wireless terminals may be mobile telephones (or "cellular" telephones) and computers with mobile terminals. As another example, a wireless terminal may be a portable, pocket, hand-held, computer-included, or vehicle-mounted mobile device. As another example, a wireless terminal may be a mobile station (mobile station), an access point (access point), or a part of a User Equipment (UE).

In the embodiments of the present application, the term "base station" includes, but is not limited to, a node, a station controller, an Access Point (AP), or any other type of interface device capable of operating in a wireless environment.

Fig. 2 schematically illustrates a flowchart of a method for selecting a target base station according to an embodiment of the present application.

Based on the system architecture shown in fig. 1, as shown in fig. 2, a method for selecting a target base station implemented by a base station side according to an embodiment of the present application includes:

step 201, if the source base station determines that the terminal needs to perform base station switching, step 202 is executed;

step 202, a source base station determines a target base station to be switched by a terminal from M adjacent base stations according to the signal quality of the M adjacent base stations, the information of network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; wherein M is a positive integer; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes, but is not limited to: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example.

In the embodiment of the application, if the source base station determines that the terminal needs to perform base station switching, a target base station to be switched by the terminal is determined from the M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example. The source base station is the target base station selected according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal, so that the signal quality of the adjacent base stations and the information of the network slice examples on the adjacent base stations are considered when the target base station is selected, and the selected target base station can better adapt to the application scene of the network slice examples. Furthermore, the problem that the selected target base station is not matched with the information of the network slice example of the terminal can be avoided.

Network Slice instance Template (NST): is a logical representation of the Network functions, telecommunication services and the corresponding resource requirements needed by the Network functions (in english can be expressed as NST is a regional representation of the Network Function(s) and a correlation of resource requirements from the resource utilization to the resource utilization and Network capabilities).

Network Slice example (NSI): is an example created in NST (english can be expressed as NSI is an instance created from a NST).

Network slicing: the concept of system behavior implemented by a network slice instance is described. Is a conceptual description of the behavior of the system implemented by the NSI (English may be denoted as Network Slice a concept description a system has been implemented as a Network Slice Instance (s)). The relationship of a network slice and a network slice instance may be 1: r and R are positive integers; i.e. R different network slice instances under the same type of network slice.

That is, a network slice instance is a collection of physical and logical resources. The information of the network slice instance of any one of the source base station, the target base station, or the neighboring base station in the embodiment of the present application specifically refers to information of the network slice instance in the network slice instances included in the base station. In the embodiment of the present application, what is gone on the network slice instance is a service, and the information of the network slice instance corresponding to the terminal refers to the information of the network slice instance corresponding to the service used by the terminal.

Fig. 2a is a schematic diagram illustrating information of a network slice example provided in an embodiment of the present application, and as shown in fig. 2a, optionally, the information of the network slice example includes: any one or more of a Network Slice Type (Network Slice Type), an Identifier of a Network Slice Instance (Slice ID), an Identifier of a Quality of Service Class (QCI), a Service Type (Service Type), and a parameter of a Network Slice Instance (Slice Identifier Parameters).

Network slice example network slice type: various types may be included, such as: enhanced mobile Broadband (eMBB), Ultra-high reliability and Ultra-Low delay Communication (uRLLC), and mass Internet of things Communication (mMTC). Such as the network slice type shown in fig. 2a, is uRLLC.

Identification of network slice instance: for identifying the network slice instance. Alternatively, the identity of the network slice instance may be a global ID. Identification of the same network slice instance the identified network slice instance may run on multiple different base stations. For example, the network slice example shown in fig. 2a is identified as 1.

Identification of quality of service class: grading can be performed according to the needs. For example, the customer's traffic may be ranked according to the customer's needs or default quality of service levels for the slice instances. For example, if the quality level required by the service of the terminal is 5, the identifier of the quality of service level in the information of the network slice instance running the service of the terminal also needs to be 5. For example, the quality of service class of the network slice example shown in fig. 2a is identified as 5.

And (4) service type: for identifying the type of traffic that the network slice instance may support or may run, also a global identification. The service type is a type to which a service belongs, is a global identifier, and the division of the service type is unique. There may be situations where the traffic types of the two network slice instances are the same and the quality of service levels are different. For example, the service type of the network slice example shown in fig. 2a is 01 Automatic Drive (Automatic Drive).

Parameters of the network slice instance: may represent the module names employed by the various layers of this network slice example. For example, a Radio Link layer Control protocol (RLC) layer in a network slice example may employ an Unacknowledged Mode (UM) or an Acknowledged Mode (AM) Mode. For example, the RLC layer is instructed in the network slice instance parameters of the network slice instance shown in fig. 2a to adopt UM.

Fig. 2b illustrates a schematic diagram of a network slice instance parameter provided by an embodiment of the present application, and as shown in fig. 2b, three network slice instances, namely a network slice instance 211, a network slice instance 212, and a network slice instance 213, are shown in the diagram. Fig. 2b shows parameters of each network slice instance in a Packet Data Convergence Protocol (PDCP) Layer, an RLC Layer, a Medium Access Control (MAC) Layer, and a physical Layer (PHY) Layer.

As shown in fig. 2b, the network slice instance 211 includes Robust header compression (ROHC), Security (Security) and integrity (integrity) modules at the PDCP layer; UM or AM is adopted in RLC layer; algorithm 1 is used at the MAC layer. Algorithm 1 guarantees throughput (throughput); at the PHY layer, the bandwidth (band) is wide (wide), the Transmission Time Interval (TTI) is 1 millisecond (ms), and the Resource Block Group (RBG) size is large (large).

As shown in fig. 2b, the network slice instance 212 includes an ROHC module at the PDCP layer; UM is adopted in RLC layer; using algorithm 2 at the MAC layer, algorithm 2 guaranteeing throughput (throughput) or grant-free transmission; at the PHY layer, the bandwidth (band) is narrow (narrow), the TTI is 0.5ms, and the RBG size is normal (normal).

As shown in fig. 2b, the network slice instance 213 includes ROHC, Security, and integrity modules at the PDCP layer; UM or AM is adopted in RLC layer; using algorithm 3 at the MAC layer, algorithm 3 guarantees throughput (throughput), delay (delay) or grant-free transmission (grant-free); at the PHY layer, the bandwidth (band) is narrow (narrow), TTI is 1ms, and RBG size is small (small).

The bandwidth (band) in the embodiment of the present application is wide (window) or narrow (narrow) which is a relative concept, not a constant value; to take a specific value, for example, the width (wide) is a bandwidth of 40MHz, and the width (narrow) is a bandwidth of 10 MHz. The size of the RBG in the embodiment of the application is large (large), normal (normal) or small (small), which is a relative concept and is not a fixed value; to give a specific value, for example, large is 24, normal is 12, and small is 6.

In the embodiment of the present application, two network slice instances with the same identifier of a network slice instance may be deployed on two different base stations, respectively. The parameters of the network slice instances included in the network slice instances that identify the same network slice instance may be the same or different.

In this embodiment of the present application, before determining, by the source base station, a target base station to be switched by the terminal from the M neighboring base stations, according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, the method further includes: the source base station receives the information of the network slice examples of the M adjacent base stations in a wired or wireless mode; and broadcasts information of the network slice instance of the source base station in a wired or wireless form. In a specific embodiment, in an optional scheme, if the base stations are connected by using an Xn port, the base stations preferentially select the Xn port to broadcast the information of their network slice instances, which saves time and labor; if the Xn interface between the base stations is not opened, the base stations can broadcast the information of the network slice examples thereof through the air interface. This may enable the base station to obtain information of network slice instances of neighboring base stations.

In one possible embodiment, each base station may maintain a table of information for one network slice instance. Fig. 2c is a schematic diagram illustrating information of a network slice instance maintained by a base station according to an embodiment of the present application, as shown in fig. 2c, a first column in the table is a base station identifier, an identifier of a neighboring base station of the base station may be filled in, a subsequent portion in the table may include information of the network slice instance correspondingly included by the neighboring base station, and the information of the network slice instance may include any one or any plurality of a network slice type, an identifier of the network slice instance, an identifier of a quality of service level, a traffic type, and a parameter of the network slice instance. Optionally, the base station identity shown in fig. 2c may also be identified as a cell identity, i.e. the base station maintains, for each cell, information of network slice instances of neighboring base stations of the cell. Assuming that the base stations all use omni-directional antennas, that is, one base station corresponds to one cell, the base station identifier shown in fig. 2c may also be identified as a cell identifier (cell ID), and the cell identifier (cell ID) is a global ID and may be unique in a Public Land Mobile Network (PLMN).

Fig. 2d schematically illustrates a flowchart of a method for selecting a target base station according to an embodiment of the present application, and as shown in fig. 2d, the method includes:

step 221, each base station in the adjacent base station and the source base station broadcasts the information of the network slice example of the base station; this step may be performed at any step prior to step 226, and need not necessarily precede step 222. That is to say, in the embodiment of the present application, the broadcast is "periodic broadcast", and the latest slice information of the current base station is periodically broadcast to the neighboring base stations on a time scale, which is not limited to the step sequence. And when the source base station judges the switching, only the currently acquired adjacent base station slice information is used as a judgment basis.

Step 222, the source base station issues measurement control to the terminal;

step 223, the terminal performs measurement and obtains a measurement result; the terminal carries out relevant measurement according to the measurement configuration message in the measurement control issued by the base station and reports the measurement result to the base station. The terminal measurement results may include, but are not limited to, Signal qualities of the neighbor base station and the source base station, such as Reference Signal ReceivingPower (RSRP) and Reference Signal Receive Quality (RSRQ);

step 224, the terminal reports the measured measurement result to the source base station;

step 225, the source base station judges whether the terminal needs to be switched according to the measurement result; if not, ending the current process, namely, the terminal is continuously left in the source base station; if so, go to step 226;

step 226, the source base station determines the target base station from the neighboring base stations of the source base station;

in step 227, the terminal performs a handover procedure to handover the terminal to the target base station.

In the step 225, the source base station determines whether to trigger the handover of the terminal according to the measurement result, and specifically, how to determine that there are various schemes, the embodiment of the present application provides several examples of determining that the handover of the terminal needs to be triggered, such as the following example a1 to example a 7.

The embodiment of the application has universality: the signal quality still needs to be considered, and the 5G network slice is extended to the carrier aggregation technology of LTE, that is, the same UE accesses the same slice instance, and may be allocated to carriers (frequencies) accessing different frequency bands according to the resource scheduling policy. That is, neighboring base stations may be deployed on different carrier bands for the same network slice instance. Meaning that the operating frequency may change when a terminal switches from one base station to another base station, subject to a certain network slice instance, without service interruption.

Example a 1: the quality of the signal of the source base station (the terminal operates on a certain carrier) is good, for example, higher than a preset signal quality threshold, that is, the service performance obtained by the terminal at the source base station is good, but in the handover with frequency priority, for example, the system of the terminal limits that the terminal operates in a certain frequency band more energy-saving/efficient, and it may trigger inter-frequency (different carriers in the same slice example) measurement and handover.

Example a 2: the quality of a signal of the source base station (that is, the terminal operates on a certain carrier) is not good, for example, the quality is lower than a preset signal quality threshold, that is, the service performance obtained by the terminal at the source base station is not good, but in the handover of the frequency priority, for example, the system of the terminal limits that the terminal operates in a certain frequency band more energy-saving/efficient, and measurement and handover of different frequencies (different carriers in the same slice example) may be triggered.

Example a 3: the quality of the signal of the source base station (the terminal operates on a certain carrier) is not good, for example, lower than a preset signal quality threshold, that is, the service performance obtained by the terminal at the source base station is not good, but if the quality of the signal of the neighboring base station (the terminal operates on a certain carrier) is higher than the preset signal quality threshold, it is determined that the terminal needs to perform handover.

Example a 4: when the signal quality (different carriers in the same slice example) of the adjacent base station is higher than a certain threshold, the source base station triggers a switching request (different carriers in the same slice example), namely, the terminal is determined to need to be switched.

In example a5, when the signal quality of the source base station is lower than a certain threshold and the signal quality of the neighboring base station (different carriers in the same slice example) is higher than a certain threshold, the source base station triggers a handover (to different carriers in the same slice example) request, that is, determines that the terminal needs to perform handover.

In example a6, when the signal quality (the same service type and the same service quality level) of the neighboring base station of the different system is higher than a certain threshold, the source base station triggers a handover (to the same service type and the same service quality level of the different system), that is, it is determined that the terminal needs to be handed over. In this example, taking the call service of enhanced mobile internet (eMBB) network slice as an example, LTE as a heterogeneous system may be regarded as another network slice for a 5G network.

In example a7, the signal quality of the source base station is lower than a certain threshold, and the signal quality of the neighbor base stations of different systems (same service type, same service quality level) is higher than a certain threshold, and the source base station triggers a handover (to the same service type and same service quality level of different systems) request, i.e. it is determined that the terminal needs to perform handover.

It can be seen from the above description that, in the embodiment of the present application, a base station may determine whether a terminal needs to be handed over through multiple decision schemes, and in summary, there are two cases, in which signal quality priority and frequency priority are considered respectively, and under the condition that the signal quality is preferred, if the signal quality of an adjacent base station is higher than that of a source base station, it is determined that the terminal needs to be handed over. Under the condition of frequency priority, if the signal quality of the adjacent base station is lower than that of the source base station, the pilot frequency measurement is still started.

In the embodiment of the application, no matter which decision measurement is adopted, if the terminal needs to be switched is judged, N quasi-target base stations are determined to exist in M adjacent base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station. For example, in the case of signal quality prioritization, a neighbor base station having higher signal quality than the source base station among the neighbor base stations may be determined as the quasi-target base station. In the case of frequency preference, a neighbor base station on a specific frequency band where a required network slice instance operates may be determined as a quasi-target base station.

In the embodiment of the application, a quasi-target base station which is matched with information of a network slice instance corresponding to a terminal is searched from the quasi-target base stations, if the quasi-target base station which is matched with the information of the network slice instance corresponding to the terminal does not exist, reconfiguration of the network slice instance is required, and an optional scheme is that a base station is found from adjacent base stations with better service performance as a target base station; other embodiments are provided in the embodiments of the present application and are described in detail below.

Optionally, N quasi-target base stations exist in the M neighbor base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M. The method for determining a target base station to be switched by a terminal from M adjacent base stations by a source base station according to the signal quality of the M adjacent base stations, the information of network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal comprises the following steps: if the quasi-target base station with the information of the network slice instance matched with the information of the network slice instance corresponding to the terminal does not exist, the method comprises the following steps: for each quasi-target base station in the N quasi-target base stations, determining from the information of the network slice example included in the quasi-target base station: the information of the network slice instance with the highest similarity to the information of the network slice instance corresponding to the terminal, and the similarity between the information of the network slice instance with the highest similarity and the information of the network slice instance corresponding to the terminal; determining a target base station to be switched by the terminal from the N quasi-target base stations according to the corresponding similarity of each quasi-target base station; the similarity between the information of the network slice instance of the quasi-target base station and the information of the network slice instance corresponding to the terminal is determined according to the parameter type and the parameter value of the parameter of the network slice instance included in the information of the two network slice instances. In this way, when there is no quasi-target base station whose information of the network slice instance matches the information of the network slice instance corresponding to the terminal, the network slice instance with the highest similarity can be selected for reconfiguration, so that the parameter items changed in the reconfiguration process of the network slice instance are as few as possible, and the change range of the parameter value is as small as possible, thereby further accelerating the reconfiguration rate.

For example, when it is determined that the terminal needs to be switched, a target base station to be switched of the terminal is determined from the M neighboring base stations according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal. For example, a quasi-target base station with better service performance may be screened first, and if there is no quasi-target base station whose information of the network slice instance matches with the information of the network slice instance corresponding to the terminal, the information of the network slice instance with the highest information similarity to the network slice instance corresponding to the terminal on each quasi-target base station is found. Or, when the terminal needs to be switched, whether an adjacent base station with the information of the network slice instance matched with the information of the network slice instance corresponding to the terminal exists or not can be determined, and if the adjacent base station exists, the adjacent base station with the better service performance in the adjacent base stations is determined as the quasi-target base station.

There are various schemes for calculating the similarity in the embodiment of the present application, for example, determining the parameter type in the parameters of the network slice instance included in the two network slice instances to be calculated, for example, the type of the module included in each layer in fig. 2b, for example, the PDCP layer in the network slice instance 211 in fig. 2b includes three modules, and the PDCP layer in the network slice instance 212 includes one module; it is also necessary to determine the parameter values in the parameters of the network slice instances included in the two network slice instances to be calculated, such as the PHY layer TTI of 1ms in network slice instance 211 and 0.5ms in network slice instance 212 in fig. 2 b. Comparing the parameter types of the parameters of the network slice examples included in the two network slice examples, seeing how many parameter types are different, then comparing the parameter values of each parameter type, seeing how many are different, and carrying out weighted addition and other calculation on the terms with the difference, so as to determine the similarity of the two network slice examples. For example, in fig. 2b, the similarity between network slice instance 211 and network slice instance 213 is greater than the similarity between network slice instance 211 and network slice instance 212.

In the embodiment of the present invention, a target base station to which a terminal needs to be switched is determined from N quasi-target base stations according to a similarity corresponding to each quasi-target base station, and there are various schemes, for example, fig. 2e provides a schematic flow chart of a method for selecting a target base station based on fig. 2d, and as shown in fig. 2e, step 226 of determining a target base station is implemented by using the following method flow:

step 251, the source base station sends a network slice instance reconfiguration request to the quasi-target base station;

step 252, after the network slice instance reconfiguration is performed by the quasi-target base station, the quasi-target base station divides the two situations into two situations, wherein the first situation that the configuration is successful can feed back a network slice instance reconfiguration success response to the source base station, and the second situation that the configuration is failed can feed back a network slice instance reconfiguration failure response to the source base station, or no information is fed back, and the source base station does not receive a response message within a preset time length, namely, the reconfiguration failure is judged;

in step 253, the source base station may determine a target base station from several quasi-target base stations that received the network slice instance reconfiguration success response.

Alternatively, the above method steps may be applied to an Xn interface, and if an NGx interface is used, the communication between the source base station and the quasi-target base station may be passed through by the MME. Fig. 2f provides a schematic flow chart of the method for selecting the target base station based on fig. 2d, and as shown in fig. 2f, the step 226 of determining the target base station is implemented by using the following method flow:

step 261, the source base station sends a network slice instance reconfiguration request to the MME;

step 262, the MME transparently transmits a network slice instance reconfiguration request to the quasi-target base station;

step 263, after the quasi-target base station performs the reconfiguration of the network slice instance, the quasi-target base station may perform two cases, where the first case is successful in configuration, and may feed back a response of successful reconfiguration of the network slice instance to the MME, and the second case is failed in configuration, and may feed back a response of failed reconfiguration of the network slice instance to the MME, or may not feed back any information;

step 264, if the MME receives the response information, the MME transparently transmits the received network slice instance reconfiguration success response or network slice instance reconfiguration failure response to the source base station;

in step 253, the source base station may determine the target base station from several quasi-target base stations that have received successful responses to reconfiguration of the network slice instance, and in another case, the source base station may determine that reconfiguration fails without receiving a response message within a preset time duration.

In order to improve reconfiguration efficiency, optionally, determining a target base station to which the terminal needs to be switched from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, includes: and in the N quasi-target base stations: determining the quasi-target base station with the highest similarity as a target base station; after determining a target base station to be switched by the terminal from the N quasi-target base stations according to the corresponding similarity of each quasi-target base station, the method further comprises the following steps: sending a network slice example reconfiguration request to a quasi-target base station with the highest similarity in the N quasi-target base stations; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; if the reconfiguration of the network slice example is determined to fail, the network slice example reconfiguration request is sent to the quasi-target base stations except the quasi-target base station which has sent the reconfiguration request of the network slice example in the N quasi-target base stations: the quasi-target base station with the highest similarity sends a network slice instance reconfiguration request until a network slice instance reconfiguration success response is received; re-determining the quasi-target base station corresponding to the received network slice instance reconfiguration success response as the target base station; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to perform reconfiguration operation on the network slice instance included in the quasi-target base station, so that the reconfigured network slice instance is compatible with the information of the network slice instance corresponding to the terminal. The reconfiguration selects the network slice instance with the highest similarity to operate, and can improve the reconfiguration rate, for example, the TTI size is adjusted from 1ms to 0.9ms, and for the air interface of the base station, under the condition supported by a hardware environment, the action is only the modification on the software parameter configuration, which is very fast and the time can be ignored.

For example, there are three quasi-target base stations in total, and the ranking is performed according to the similarity, the similarity of the information of the network slice instance corresponding to the quasi-target base station 1 and the terminal is the highest, and the quasi-target base station 3 is the smallest after 2 times. The source base station sends a network slice instance reconfiguration request to the quasi-target base station 1, so that the quasi-target base station 1 reconfigures the network slice instance with the highest information similarity of the network slice instance corresponding to the terminal. If it is determined that the reconfiguration of the network slice instance fails, for example, a reconfiguration failure response of the network slice instance is received or a reconfiguration success response of the network slice instance is not received within a preset time length, the reconfiguration failure response is sent to the quasi-target base stations except the quasi-target base station which has sent the reconfiguration request of the network slice instance among the N quasi-target base stations: and the quasi-target base station with the highest similarity sends a network slice instance reconfiguration request, namely sends the network slice instance reconfiguration request to the quasi-target base station 2, and if the quasi-target base station 2 is reconfigured successfully, the quasi-target base station 2 is determined as the target base station. And if the quasi-target base station 2 fails to reconfigure, continuing to send a network slice instance reconfiguration request to the quasi-target base station 3, and if the quasi-target base station 3 succeeds in reconfiguring, determining the quasi-target base station 3 as the target base station. And if the quasi-target base station 3 is also failed to reconfigure, determining that the target base station cannot be obtained, and ending the process.

Further, if multiple preparations are performed to improve the probability of successful reconfiguration and improve the reliability of terminal handover, optionally, determining a target base station to be handed over by the terminal from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, including: to N quasi-target base stations: each quasi-target base station in P quasi-target base stations with the similarity sequenced from high to low at the front P positions sends a network slice instance reconfiguration request; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; p is a positive integer not greater than N; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to carry out reconfiguration operation on the network slice instance included by the quasi-target base station so as to enable the reconfigured network slice instance to be compatible with the information of the network slice instance corresponding to the terminal; and if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received, determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response.

In order to ensure the shortest time delay, another optional scheme is that, if a network slice instance reconfiguration success response returned by one base station of the P quasi-target base stations is received, the quasi-target base station corresponding to the earliest received network slice instance reconfiguration success response is determined as the target base station, and a reconfiguration cancel command is sent to the remaining P-1 quasi-target base stations in the P quasi-target base stations; wherein the reconfiguration cancel command is used to cause the remaining P-1 quasi-target base stations to cancel the reconfiguration operation on the network slice instance. Specifically, the source base station sends a network slice instance reconfiguration request to a plurality of quasi-target base stations, and upon receiving a network slice instance reconfiguration success response, that is, the network slice instance reconfiguration success response is the received first network slice instance reconfiguration success response, which indicates that the time delay of the quasi-target base station corresponding to the network slice instance reconfiguration success response is short, the quasi-target base station corresponding to the network slice instance reconfiguration success response is determined as the target base station. Therefore, the reconfiguration of the rest P-1 quasi-target base stations can be avoided, and the consumption of network resources is saved.

In a possible implementation manner, the network slice instance reconfiguration success response includes information of the network slice instance after reconfiguration; the network slice instance indicated by the reconfigured information of the network slice instance is compatible with the service carried by the network slice instance indicated by the information of the network slice instance corresponding to the terminal; the network slice instance reconfiguration success response is obtained after the target base station reconfigures the existing network slice instance of the base station. Optionally, after the quasi-target base station reconfigures the network slice instance included in the quasi-target base station in the embodiment of the present application, the reconfigured network slice instance may not only run a service that the network slice instance is running before reconfiguration, but also be compatible with information of the network slice instance corresponding to the terminal, that is, may run a service supported by the network slice instance corresponding to the terminal. Optionally, the identifier of the network slice instance reconfigured on the quasi-target base station may be changed, for example, the identifier of the network slice instance corresponding to the terminal is changed to be the same, or may not be changed.

If N quasi-target base stations exist in the M adjacent base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the method for determining a target base station to be switched by a terminal from M adjacent base stations by a source base station according to the signal quality of the M adjacent base stations, the information of network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal comprises the following steps: if K quasi-target base stations which match the information of the network slice example with the information of the network slice example corresponding to the terminal exist, then: determining K quasi-target base stations with the information of the network slice example matched with the information of the network slice example corresponding to the terminal as target base stations; wherein K is a positive integer not greater than N.

After determining a target base station to be switched by the terminal from the M adjacent base stations, the source base station can also send a switching request to the target base station; the switching request comprises information of a network slice example corresponding to the terminal; the source base station receives a switching response returned by the target base station; the switching response comprises information of a network slice example to be accessed of the terminal; the network slice example indicated by the information of the network slice example to be accessed is as follows: and the service carried by the network slice instance indicated by the information of the network slice instance corresponding to the compatible terminal. Therefore, the process of switching the terminal to the target base station is realized, and the terminal is accessed into the network slice instance which can be compatible with the information of the network slice instance corresponding to the terminal in the target base station, so that the uninterrupted terminal service is ensured.

In the embodiment of the present application, there may be one or more target base stations determined in the foregoing content, and the terminal is accessed to one target base station of the one or more determined target base stations in the handover process. There are various schemes for switching the terminal to the target base station in the step 227, such as the above scheme, and the following contents of the embodiment of the present application provide several schemes for executing the step 227. Fig. 2g exemplarily shows a flowchart of a method for selecting a target base station and performing terminal handover provided by an embodiment of the present application, and as shown in fig. 2g, the method includes:

step 271, the source base station sends a handover request to the target base station; the switching request can include information of a network slice instance corresponding to the terminal, so that the information of the network slice needed by the target base station can be informed, and the target base station can accurately find out the network slice instance accessible to the terminal; optionally, the handover request may further include a Radio Resource Control (RRC) context, such AS a terminal capability, a current Access Stratum (AS) configuration, and specific radio resource management information of the terminal; the information of the network slice instance does not necessarily include an identifier of the network slice instance, for example, different network slice instances support a service set, and the same service may run on different network slice instances;

step 272, the target base station performs a resource establishment procedure; optionally, the resource establishment procedure includes, but is not limited to, allocating required resources, such as spectrum resources, calculation and storage resources, etc., to the terminal;

step 273, the target base station returns a switching request response to the source base station; the handover request response may include an RRC connection reconfiguration message mobility control message (such as a target Cell Identifier and a frequency to be accessed by the terminal), a general Radio resource configuration message (such as a message requesting random access), a dedicated Radio resource configuration, a security configuration, and a Cell Radio Network Temporary Identifier (C-RNTI) (i.e., a Radio Network Temporary Identifier (RNTI) used when the UE is in a certain Cell). Optionally, the handover request response further includes information such as a service type and a service quality level of the network slice instance;

step 274, the source base station sends a handover command to the terminal; the source base station can transparently forward the received switching request response to the terminal;

275, optionally, performing state transition between the source base station and the target base station; for bearers requiring sequential packet sending, the state transition message provides a sequence number and Hyper Frame Number (HFN) (HFN is used to limit the number of bits of the transmission sequence number over the air interface) that the target base station should assign to the first packet that must be sent without assigning a sequence number. When sending the state transfer message, the source service base station freezes the state of the transmitter/receiver, namely stops distributing the PDCP Sequence Number (SN) to the downlink packet and stops sending the uplink packet to the core network;

step 276, the terminal sends a handover complete instruction to the target base station, and optionally, the handover complete instruction specifically refers to a process of completing Radio Resource Control (RRC) connection reconfiguration, random access, and the like between the terminal and the target base station;

step 277, the target base station sends a path transfer request to the MME:

step 278, the MME sends a path transfer request response to the target base station;

step 279, the target base station sends the instruction of releasing the resource to the source base station, so as to release the resource of the source base station.

Alternatively, the above method steps may be applied to an Xn interface, and if an NGx interface is used, the communication between the source base station and the quasi-target base station may be passed through by the MME. Fig. 2h provides a schematic flowchart of a method for selecting a target base station and switching a terminal according to an embodiment of the present application, and as shown in fig. 2h, step 227 of determining the target base station is implemented by using the following method flows:

step 281, the source base station sends a switching request to the MME; the switching request can include information of a network slice instance corresponding to the terminal, so that the information of the network slice needed by the target base station can be informed, and the target base station can accurately find out the network slice instance accessible to the terminal; optionally, a Radio Resource Control (RRC) context may also be included in the handover request, such AS terminal capability, current AS configuration, and specific Radio resource management information of the terminal; the information of the network slice instance does not necessarily include an identifier of the network slice instance, for example, different network slice instances support a service set, and the same service may run on different network slice instances;

282, the MME transparently transmits a switching request to the target base station;

283, the target base station executes the resource establishment process; optionally, the resource establishment procedure includes, but is not limited to, allocating required resources, such as spectrum resources, calculation and storage resources, etc., to the terminal;

step 284, the target base station returns a handover request response to the MME;

step 285, the MME returns a switching request response to the source base station; the handover request response may include, among others, an RRC connection reconfiguration message, a mobility control message (such as a target cell identity and a frequency to be accessed by the terminal), a general radio resource configuration message (such as a message requesting random access), and a dedicated radio resource configuration, a security configuration, and a C-RNTI. Optionally, the handover request response further includes information such as a service type and a service quality level of the network slice instance;

step 286, the source base station sends a switching command to the terminal; optionally, the source base station may transparently forward the received handover request response to the terminal;

step 287, which may be optional step 288, the source base station sending a state transition instruction to the MME;

288, the MME transparently passes the state transition instruction to the target base station; for bearers requiring sequential packet sending, the state transition message provides a sequence number and Hyper Frame Number (HFN) (HFN is used to limit the number of bits of the transmission sequence number over the air interface) that the target base station should assign to the first packet that must be sent without assigning a sequence number. When sending the state transfer message, the source service base station freezes the state of a transmitter/receiver thereof, namely stops distributing PDCP SN to the downlink packet and stops sending the uplink packet to the core network;

step 289, the terminal sends a handover complete instruction to the target base station, optionally, the handover complete instruction specifically refers to a process of completing Radio Resource Control (RRC) connection reconfiguration, random access, and the like between the terminal and the target base station;

step 290, the target base station sends a handover notification to the MME for notifying the path transfer;

in step 291, the target base station sends a resource release instruction to the source base station, so as to release the resource of the source base station.

The embodiment of the application can be applied to the network slice example architecture in the future 5G network.

Fig. 3 schematically illustrates a structural diagram of an apparatus for selecting a target base station according to an embodiment of the present application.

Based on the same concept, the embodiment of the present application provides an apparatus 300 for selecting a target base station, which is used to perform any one of the above methods. As shown in fig. 3, the apparatus 300 for selecting a target base station includes a processor 301, a transceiver 302, a memory 303, and a communication interface 304; wherein the processor 301, the transceiver 302, the memory 303 and the communication interface 304 are connected to each other by a bus 305.

The bus 305 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 3, but this does not mean only one bus or one type of bus.

Memory 303 may include volatile memory (volatile memory), such as random-access memory (RAM); the memory may also include a non-volatile memory (non-volatile) such as a flash memory (flash memory), a Hard Disk Drive (HDD) or a solid-state drive (SSD); the memory 303 may also comprise a combination of memories of the kind described above.

The communication interface 304 may be a wired communication access port, a wireless communication interface, or a combination thereof, wherein the wired communication interface may be, for example, an ethernet interface. The ethernet interface may be an optical interface, an electrical interface, or a combination thereof. The wireless communication interface may be a WLAN interface.

The processor 301 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP. The processor 301 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), a General Array Logic (GAL), or any combination thereof.

Optionally, the memory 303 may also be used to store program instructions, and the processor 301 invokes the program instructions stored in the memory 303, may execute one or more steps in the embodiments shown in the above schemes, or an alternative implementation thereof, so that the apparatus 300 for selecting a target base station implements the functions of the apparatus for selecting a target base station in the above methods.

The processor 301 is configured to execute the instructions stored in the memory and control the transceiver 302 to perform signal receiving and signal transmitting, and when the processor 301 executes the instructions stored in the memory, the apparatus 300 for selecting a target base station is configured to perform the following.

A processor 301, configured to, if it is determined that the terminal needs to perform base station handover: determining a target base station to be switched by the terminal from the M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; wherein M is a positive integer; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example.

For the network slice example and the definition of the network slice in the embodiment of the present application, reference is made to the above contents, and details are not described herein again. The relationship of a network slice and a network slice instance may be 1: r and R are positive integers; i.e. R different network slice instances under the same type of network slice.

That is, a network slice instance in the embodiments of the present application is a collection of physical and logical resources. The information of the network slice instance of any one of the source base station, the target base station, or the neighboring base station in the embodiment of the present application specifically refers to information of the network slice instance in the network slice instances included in the base station. In the embodiment of the present application, what is gone on the network slice instance is a service, and the information of the network slice instance corresponding to the terminal refers to the information of the network slice instance corresponding to the service used by the terminal.

Before determining a target base station to which the terminal needs to be switched from the M neighboring base stations according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, the transceiver 302 is further configured to: receiving information of network slice instances of M neighbor base stations in a wired or wireless mode; a transceiver 302, further configured to: the information of the network slice instance of the source base station is broadcasted in a wired or wireless form. Optionally, the information of the network slice instance includes: any one or more of a Network Slice Type (Network Slice Type), an Identifier of a Network Slice instance (Slice ID), an Identifier of a Quality of Service Class (QCI), a Service Type (Service Type), and a parameter of a Network Slice instance (Slice parameters). In an optional scheme, if the base stations are connected by adopting Xn ports in a wired mode, the base stations can preferentially select the Xn ports to broadcast the information of the network slice examples of the base stations, and therefore time and labor can be saved; if the Xn interface between the base stations is not opened, the base stations can broadcast the information of the network slice examples thereof through the air interface. This may enable the base station to obtain information of network slice instances of neighboring base stations.

In this embodiment of the present application, the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal may include, but is not limited to: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example. For example, the information of each network slice instance may directly include the service type and quality of service level of the network slice instance; an identification of the network slice instance may also be included, and the traffic type and quality of service level may be ascertained from the identification of the network slice instance.

In an optional embodiment, N quasi-target base stations exist in M neighboring base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the processor 301, when determining a target base station to which the terminal needs to be switched from the M neighboring base stations according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, is configured to: if the quasi-target base station with the information of the network slice example matched with the information of the network slice example corresponding to the terminal does not exist, aiming at each quasi-target base station in the N quasi-target base stations, determining from the information of the network slice example included in the quasi-target base stations: the information of the network slice instance with the highest similarity to the information of the network slice instance corresponding to the terminal, and the similarity between the information of the network slice instance with the highest similarity and the information of the network slice instance corresponding to the terminal; determining a target base station to be switched by the terminal from the N quasi-target base stations according to the corresponding similarity of each quasi-target base station; the similarity between the information of the network slice instance of the quasi-target base station and the information of the network slice instance corresponding to the terminal is determined according to the parameter type and the parameter value of the parameter of the network slice instance included in the information of the two network slice instances. In this way, when there is no quasi-target base station whose information of the network slice instance matches the information of the network slice instance corresponding to the terminal, the network slice instance with the highest similarity can be selected for reconfiguration, so that the parameter items changed in the reconfiguration process of the network slice instance are as few as possible, and the change range of the parameter value is as small as possible, thereby further accelerating the reconfiguration rate.

In order to improve reconfiguration efficiency, in an optional embodiment, when determining a target base station to which the terminal needs to be handed over from N quasi-target base stations according to a similarity corresponding to each quasi-target base station, the processor 301 is configured to: and in the N quasi-target base stations: determining the quasi-target base station with the highest similarity as a target base station; the transceiver 302, after the processor 301 determines a target base station to which the terminal needs to be switched from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, is further configured to: sending a network slice example reconfiguration request to a quasi-target base station with the highest similarity in the N quasi-target base stations; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; if the reconfiguration of the network slice example is determined to fail, the network slice example reconfiguration request is sent to the quasi-target base stations except the quasi-target base station which has sent the reconfiguration request of the network slice example in the N quasi-target base stations: the quasi-target base station with the highest similarity sends a network slice instance reconfiguration request until a network slice instance reconfiguration success response is received; processor 301, further configured to: re-determining the quasi-target base station corresponding to the network slice instance reconfiguration success response received through the transceiver 302 as the target base station; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to perform reconfiguration operation on the network slice instance included in the quasi-target base station, so that the reconfigured network slice instance is compatible with the information of the network slice instance corresponding to the terminal.

In order to better improve the probability of successful reconfiguration and improve the reliability of terminal handover, multiple preparations may be performed, and optionally, when the processor 301 determines, according to the similarity corresponding to each quasi-target base station, a target base station to be handed over by the terminal from the N quasi-target base stations, specifically: by the transceiver 302, to the N quasi-target base stations: each quasi-target base station in P quasi-target base stations with the similarity sequenced from high to low at the front P positions sends a network slice instance reconfiguration request; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; p is a positive integer not greater than N; the network slice instance reconfiguration request is used to enable the quasi-target base station that receives the network slice instance reconfiguration request to perform reconfiguration operation on the network slice instance included in the quasi-target base station, so that if the information of the network slice instance corresponding to the reconfigured network slice instance compatible terminal receives at least one network slice instance reconfiguration success response returned by the P quasi-target base stations through the transceiver 302, the quasi-target base station corresponding to the at least one network slice instance reconfiguration success response is determined.

One implementation may find one as a target base station from the quasi-target base stations that receive the network slice instance reconfiguration success response, or find multiple as target base stations for improved reliability. Optionally, when the processor 301 determines the target base station from the quasi-target base stations corresponding to at least one network slice instance reconfiguration success response if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received, is configured to: if a network slice instance reconfiguration success response respectively returned by each of the L quasi-target base stations in P is received through the transceiver 302, then: determining a quasi-target base station with the optimal service performance after the terminal is accessed in the L quasi-target base stations as a target base station; l is a positive integer not greater than P.

In order to ensure the shortest time delay, another optional scheme is that, if a successful network slice instance reconfiguration response returned by one base station of the P quasi-target base stations is received through the transceiver 302, the quasi-target base station corresponding to the earliest received successful network slice instance reconfiguration response is determined as the target base station, and a reconfiguration cancel command is sent to the remaining P-1 quasi-target base stations of the P quasi-target base stations; wherein the reconfiguration cancel command is used to cause the remaining P-1 quasi-target base stations to cancel the reconfiguration operation on the network slice instance.

If N quasi-target base stations exist in the M adjacent base stations; each of the N quasi-target base stations may satisfy the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the processor 301, when determining a target base station to which the terminal needs to be switched from the M neighboring base stations according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, is configured to: if K quasi-target base stations which match the information of the network slice example with the information of the network slice example corresponding to the terminal exist, then: determining K quasi-target base stations with the information of the network slice example matched with the information of the network slice example corresponding to the terminal as target base stations; wherein K is a positive integer not greater than N.

The processor 301 is further configured to: after a target base station to be switched by the terminal is determined from the M adjacent base stations, a switching request is sent to the target base station through the transceiver; wherein, the switching request includes information of a network slice instance corresponding to the terminal; receiving a handover response returned by the target base station through the transceiver 302; the switching response comprises information of a network slice example to be accessed of the terminal; the network slice example indicated by the information of the network slice example to be accessed is as follows: and the service carried by the network slice instance indicated by the information of the network slice instance corresponding to the compatible terminal. Therefore, the process of switching the terminal to the target base station is realized, and the terminal is accessed into the network slice instance which can be compatible with the information of the network slice instance corresponding to the terminal in the target base station, so that the uninterrupted terminal service is ensured.

Fig. 4 schematically shows a structural diagram of an apparatus for selecting a target base station according to an embodiment of the present application.

Based on the same concept, the embodiment of the present application provides an apparatus for selecting a target base station, which is used for executing the above method procedure. The apparatus 400 for selecting a target base station may be configured to perform any of the above-described methods. As shown in fig. 4, the apparatus 400 for selecting a target base station includes a receiving unit 401, a processing unit 402, and a transmitting unit 403.

A processing unit 402, configured to, if it is determined that the terminal needs to perform base station handover: determining a target base station to be switched by the terminal from the M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; wherein M is a positive integer; the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example.

Optionally, before determining, according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, a target base station to which the terminal needs to be switched from the M neighboring base stations, the receiving unit 401 is further configured to: receiving information of network slice instances of M neighbor base stations in a wired or wireless mode; the sending unit 403 is further configured to: the information of the network slice instance of the source base station is broadcasted in a wired or wireless form. Optionally, the information of the network slice instance includes: any one or more of a Network Slice Type (Network Slice Type), an identifier of a Network Slice instance (Slice ID), an identifier of a Quality of Service class (Quality of Service class identifier, QCI), a Service Type (Service Type), and a parameter of a Network Slice instance (Slice parameters). In an optional scheme, if the base stations are connected by adopting Xn ports in a wired mode, the base stations can preferentially select the Xn ports to broadcast the information of the network slice examples of the base stations, and therefore time and labor can be saved; if the Xn interface between the base stations is not opened, the base stations can broadcast the information of the network slice examples thereof through the air interface. This may enable the base station to obtain information of network slice instances of neighboring base stations.

Optionally, in this embodiment of the present application, the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: and indicating information used for indicating the service type and the service quality level of the network slice example indicated by the information of the network slice example. For example, the information of each network slice instance may directly include the service type and quality of service level of the network slice instance; an identification of the network slice instance may also be included, and the traffic type and quality of service level may be ascertained from the identification of the network slice instance.

In an optional embodiment, N quasi-target base stations exist in M neighboring base stations; each quasi-target base station in the N quasi-target base stations meets the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the processing unit 402, when determining a target base station to which the terminal needs to be switched from M neighboring base stations according to the signal quality of the M neighboring base stations, information of network slice instances of the M neighboring base stations, and information of network slice instances corresponding to the terminal, is configured to: if the quasi-target base station with the information of the network slice example matched with the information of the network slice example corresponding to the terminal does not exist, aiming at each quasi-target base station in the N quasi-target base stations, determining from the information of the network slice example included in the quasi-target base stations: the information of the network slice instance with the highest similarity to the information of the network slice instance corresponding to the terminal, and the similarity between the information of the network slice instance with the highest similarity and the information of the network slice instance corresponding to the terminal; determining a target base station to be switched by the terminal from the N quasi-target base stations according to the corresponding similarity of each quasi-target base station; the similarity between the information of the network slice instance of the quasi-target base station and the information of the network slice instance corresponding to the terminal is determined according to the parameter type and the parameter value of the parameter of the network slice instance included in the information of the two network slice instances. In this way, when there is no quasi-target base station whose information of the network slice instance matches the information of the network slice instance corresponding to the terminal, the network slice instance with the highest similarity can be selected for reconfiguration, so that the parameter items changed in the reconfiguration process of the network slice instance are as few as possible, and the change range of the parameter value is as small as possible, thereby further accelerating the reconfiguration rate.

In order to improve reconfiguration efficiency, in an optional embodiment, when determining a target base station to which the terminal needs to be handed over from N quasi-target base stations according to a similarity corresponding to each quasi-target base station, the processing unit 402 is configured to: and in the N quasi-target base stations: determining the quasi-target base station with the highest similarity as a target base station; after the processing unit 402 determines a target base station to which the terminal needs to be switched from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, the sending unit 403 is further configured to: sending a network slice example reconfiguration request to a quasi-target base station with the highest similarity in the N quasi-target base stations; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; if the reconfiguration of the network slice example is determined to fail, the network slice example reconfiguration request is sent to the quasi-target base stations except the quasi-target base station which has sent the reconfiguration request of the network slice example in the N quasi-target base stations: the quasi-target base station with the highest similarity sends a network slice instance reconfiguration request until a network slice instance reconfiguration success response is received; a processing unit 402, further configured to: re-determining the quasi-target base station corresponding to the network slice instance reconfiguration success response received by the receiving unit 401 as the target base station; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to perform reconfiguration operation on the network slice instance included in the quasi-target base station, so that the reconfigured network slice instance is compatible with the information of the network slice instance corresponding to the terminal.

Optionally, in order to improve the probability of successful reconfiguration and improve the reliability of terminal handover, multiple preparations may be performed, and optionally, the sending unit 403 is configured to: to N quasi-target base stations: each quasi-target base station in P quasi-target base stations with the similarity sequenced from high to low at the front P positions sends a network slice instance reconfiguration request; the network slice instance reconfiguration request comprises information of a network slice instance corresponding to the terminal; p is a positive integer not greater than N; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to carry out reconfiguration operation on the network slice instance included by the quasi-target base station so as to enable the reconfigured network slice instance to be compatible with the information of the network slice instance corresponding to the terminal; the processing unit 402, when determining a target base station to which the terminal needs to be switched from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, is configured to: if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received through the receiving unit 401, the target base station is determined from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response.

Accordingly, one of the quasi-target base stations that received the network slice instance reconfiguration success response may be found as the target base station, or a plurality of the quasi-target base stations may be found as the target base stations for improving reliability. Optionally, when receiving at least one network slice instance reconfiguration success response returned by the P quasi-target base stations, and determining a target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response, the processing unit 402 is configured to: if a network slice instance reconfiguration success response respectively returned by each of the L quasi-target base stations in P is received through the receiving unit 401, then: determining a quasi-target base station with the optimal service performance after the terminal is accessed in the L quasi-target base stations as a target base station; l is a positive integer not greater than P.

In order to ensure the shortest time delay, another optional scheme is that, if a successful network slice instance reconfiguration response returned by one base station of the P quasi-target base stations is received through the receiving unit 401, the quasi-target base station corresponding to the earliest received successful network slice instance reconfiguration response is determined as the target base station, and a reconfiguration cancel command is sent to the remaining P-1 quasi-target base stations of the P quasi-target base stations; wherein the reconfiguration cancel command is used to cause the remaining P-1 quasi-target base stations to cancel the reconfiguration operation on the network slice instance.

If N quasi-target base stations exist in the M neighbor base stations, each of the N quasi-target base stations may satisfy the condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M; the processing unit 402, when determining a target base station to which the terminal needs to be switched from M neighboring base stations according to the signal quality of the M neighboring base stations, information of network slice instances of the M neighboring base stations, and information of network slice instances corresponding to the terminal, is configured to: if K quasi-target base stations which match the information of the network slice example with the information of the network slice example corresponding to the terminal exist, then: determining K quasi-target base stations with the information of the network slice example matched with the information of the network slice example corresponding to the terminal as target base stations; wherein K is a positive integer not greater than N.

After determining a target base station to which the terminal needs to be switched from M neighboring base stations, the sending unit 403 may also send a switching request to the target base station; the switching request comprises information of a network slice example corresponding to the terminal; the receiving unit 401 is further configured to: receiving a switching response returned by the target base station; the switching response comprises information of a network slice example to be accessed of the terminal; the network slice example indicated by the information of the network slice example to be accessed is as follows: and the service carried by the network slice instance indicated by the information of the network slice instance corresponding to the compatible terminal. Therefore, the process of switching the terminal to the target base station is realized, and the terminal is accessed into the network slice instance which can be compatible with the information of the network slice instance corresponding to the terminal in the target base station, so that the uninterrupted terminal service is ensured.

It should be understood that the above division of the units is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. In this embodiment, the receiving unit 401 and the sending unit 403 may be implemented by the transceiver 302, and the processing unit 402 may be implemented by the processor 301. As shown in fig. 3, the apparatus 300 for selecting a target base station may include a processor 301, a transceiver 302, and a memory 303. The memory 303 may be configured to store codes for the processor 301 to execute the scheme, and the codes may be pre-installed programs/codes when the apparatus 300 for selecting a target base station is shipped from the factory.

In the above embodiments, all or part of the implementation may be realized by software, hardware, firmware or any combination thereof, and when the implementation is realized by a software program, all or part of the implementation may be realized in the form of a computer program product. The computer program product includes one or more computer instructions. The procedures or functions according to the embodiments of the invention are brought about in whole or in part when the computer program instructions are loaded and executed on a computer. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., a flexible Disk, a hard Disk, a magnetic tape, a magneto-optical Disk (MO), etc.), an optical medium (e.g., a CD, a DVD, a BD, an HVD, etc.), or a semiconductor medium (e.g., a ROM, an EPROM, an EEPROM, a nonvolatile memory (NAND FLASH), a Solid State Disk (SSD)), etc.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, embodiments of the present application 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 application 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 application are described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. 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 instructions. These computer 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 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 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 application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to encompass such modifications and variations.

Claims

1. A method of selecting a target base station, comprising:

a source base station determines that a terminal needs to perform base station switching;

the source base station determines a target base station to be switched by the terminal from M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; wherein M is a positive integer;

wherein the information of each network slice instance in the information of the network slice instances of the M neighboring base stations and the information of the network slice instance corresponding to the terminal includes: indication information for indicating the service type and the service quality level of the network slice instance indicated by the information of the network slice instance;

wherein the information of the network slice instance of the target base station is matched with the information of the network slice instance corresponding to the terminal, or,

and the information of the network slice example after the reconfiguration of the target base station is compatible with the information of the network slice example corresponding to the terminal.

2. The method of claim 1, wherein before the source base station determines a target base station to which the terminal needs to be handed over from the M neighboring base stations according to the signal qualities of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, the method further comprises:

the source base station receives the information of the network slice instances of the M adjacent base stations in a wired or wireless mode; and broadcasts information of the network slice instance of the source base station in a wired or wireless form.

3. The method of claim 1 or 2, wherein there are N quasi-target base stations among the M neighbor base stations; each of the N quasi-target base stations satisfies a condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M;

the method for determining, by the source base station, a target base station to which the terminal needs to be switched from the M neighbor base stations according to the signal quality of the M neighbor base stations, the information of the network slice instances of the M neighbor base stations, and the information of the network slice instances corresponding to the terminal includes:

if the quasi-target base station with the information of the network slice instance matched with the information of the network slice instance corresponding to the terminal does not exist, the method comprises the following steps:

for each quasi-target base station in the N quasi-target base stations, determining from information of a network slice instance included in the quasi-target base station: the information of the network slice instance with the highest similarity to the information of the network slice instance corresponding to the terminal, and the similarity between the information of the network slice instance with the highest similarity and the information of the network slice instance corresponding to the terminal;

determining a target base station to be switched by the terminal from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station;

the similarity between the information of the network slice instance of the quasi-target base station and the information of the network slice instance corresponding to the terminal is determined according to the parameter type and the parameter value of the parameter of the network slice instance included in the information of the two network slice instances.

4. The method of claim 3, wherein the determining the target base station to which the terminal needs to be handed over from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station comprises:

determining the quasi-target base station with the highest similarity in the N quasi-target base stations as the target base station;

after the target base station to which the terminal needs to be switched is determined from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, the method further includes:

sending a network slice instance reconfiguration request to the quasi-target base station with the highest similarity in the N quasi-target base stations; wherein, the network slice instance reconfiguration request includes information of the network slice instance corresponding to the terminal;

if it is determined that the reconfiguration of the network slice instance fails, sending, to the quasi-target base stations, except the quasi-target base station which has sent the reconfiguration request of the network slice instance, of the N quasi-target base stations: the quasi-target base station with the highest similarity sends the reconfiguration request of the network slice instance until a successful reconfiguration response of the network slice instance is received;

re-determining the quasi-target base station corresponding to the received network slice instance reconfiguration success response as the target base station;

the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to perform reconfiguration operation on the network slice instance included in the quasi-target base station, so that the reconfigured network slice instance is compatible with the information of the network slice instance corresponding to the terminal.

5. The method of claim 3, wherein the determining the target base station to which the terminal needs to be handed over from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station comprises:

and B, to the N quasi-target base stations: each quasi-target base station in P quasi-target base stations with the similarity sequenced from high to low at the front P positions sends a network slice instance reconfiguration request; wherein, the network slice instance reconfiguration request includes information of the network slice instance corresponding to the terminal; p is a positive integer not greater than N; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to carry out reconfiguration operation on the network slice instance included by the quasi-target base station so as to enable the reconfigured network slice instance to be compatible with the information of the network slice instance corresponding to the terminal;

and if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received, determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response.

6. The method of claim 5, wherein if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received, determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response, comprises:

if a network slice instance reconfiguration success response respectively returned by each quasi-target base station in the L quasi-target base stations in the P is received, then: determining the quasi-target base station with the optimal service performance after the terminal is accessed in the L quasi-target base stations as the target base station; l is a positive integer not greater than P;

or;

if a network slice instance reconfiguration success response returned by one base station of the P quasi-target base stations is received, determining the quasi-target base station corresponding to the earliest received network slice instance reconfiguration success response as the target base station, and sending a reconfiguration canceling command to the remaining P-1 quasi-target base stations in the P quasi-target base stations; wherein the reconfiguration cancel command is used for causing the remaining P-1 quasi-target base stations to cancel the reconfiguration operation on the network slice instance.

7. The method of claim 1 or 2, wherein there are N quasi-target base stations among the M neighbor base stations; each of the N quasi-target base stations satisfies a condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M;

if K quasi-target base stations which match the information of the network slice example with the information of the network slice example corresponding to the terminal exist, then:

determining K quasi-target base stations with the information of the network slice example matched with the information of the network slice example corresponding to the terminal as the target base stations;

wherein K is a positive integer not greater than N.

8. The method as claimed in claim 1 or 2, wherein after determining the target base station to which the terminal needs to be handed over from the M neighbor base stations, the method further comprises:

the source base station sends a switching request to the target base station; wherein, the switching request includes information of a network slice instance corresponding to the terminal;

the source base station receives a switching response returned by the target base station; wherein the switching response comprises information of a network slice instance to be accessed by the terminal;

wherein, the network slice instance indicated by the information of the network slice instance to be accessed: and the service carried by the network slice instance indicated by the information of the network slice instance corresponding to the terminal is compatible.

9. An apparatus for selecting a target base station, the apparatus for selecting a target base station comprising a processor, a transceiver, and a memory;

the memory is used for storing instructions, the processor is used for executing the instructions stored by the memory and controlling the transceiver to receive and transmit signals, and when the processor executes the instructions stored by the memory, the processor executes:

if the terminal is determined to need to perform base station switching, then:

determining a target base station to be switched by the terminal from M adjacent base stations according to the signal quality of the M adjacent base stations, the information of the network slice examples of the M adjacent base stations and the information of the network slice examples corresponding to the terminal; wherein M is a positive integer;

10. The apparatus as claimed in claim 9, wherein the transceiver, before determining the target base station to be handed over by the terminal from the M neighboring base stations according to the signal qualities of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instance corresponding to the terminal, is further configured to:

receiving information of network slice instances of the M neighbor base stations in a wired or wireless form; and broadcasts information of the network slice instance of the source base station in a wired or wireless form.

11. The apparatus of claim 9 or 10, wherein there are N quasi-target base stations among the M neighbor base stations; each of the N quasi-target base stations satisfies a condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M;

the processor, when determining a target base station to which the terminal needs to be switched from the M neighboring base stations according to the signal quality of the M neighboring base stations, the information of the network slice instances of the M neighboring base stations, and the information of the network slice instances corresponding to the terminal, is specifically configured to:

12. The apparatus of claim 11, wherein the processor, when determining the target base station to which the terminal needs to be handed over from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, is specifically configured to:

and in the N quasi-target base stations: the quasi-target base station with the highest similarity is determined as the target base station;

the transceiver, after the processor determines a target base station to which the terminal needs to be switched from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, is further configured to:

the processor is further configured to:

re-determining a quasi-target base station corresponding to the network slice instance reconfiguration success response received by the transceiver as the target base station;

13. The apparatus of claim 11, wherein the processor, when determining the target base station to which the terminal needs to be handed over from the N quasi-target base stations according to the similarity corresponding to each quasi-target base station, is specifically configured to:

transmitting, by the transceiver, to the N quasi-target base stations: each quasi-target base station in P quasi-target base stations with the similarity sequenced from high to low at the front P positions sends a network slice instance reconfiguration request; wherein, the network slice instance reconfiguration request includes information of the network slice instance corresponding to the terminal; p is a positive integer not greater than N; the network slice instance reconfiguration request is used for enabling the quasi-target base station receiving the network slice instance reconfiguration request to carry out reconfiguration operation on the network slice instance included by the quasi-target base station so as to enable the reconfigured network slice instance to be compatible with the information of the network slice instance corresponding to the terminal;

and if at least one network slice instance reconfiguration success response returned by the P quasi-target base stations is received through the transceiver, determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response.

14. The apparatus of claim 13, wherein the processor, when receiving at least one network slice instance reconfiguration success response returned by the P quasi-target base stations, and determining the target base station from the quasi-target base stations corresponding to the at least one network slice instance reconfiguration success response, is specifically configured to:

if a network slice instance reconfiguration success response respectively returned by each of the L quasi-target base stations in the P is received through the transceiver, then: determining the quasi-target base station with the optimal service performance after the terminal is accessed in the L quasi-target base stations as the target base station; l is a positive integer not greater than P; or

If a network slice instance reconfiguration success response returned by one base station of the P quasi-target base stations is received through the transceiver, determining the quasi-target base station corresponding to the earliest received network slice instance reconfiguration success response as the target base station, and sending a reconfiguration canceling command to the remaining P-1 quasi-target base stations in the P quasi-target base stations; wherein the reconfiguration cancel command is used for causing the remaining P-1 quasi-target base stations to cancel the reconfiguration operation on the network slice instance.

15. The apparatus of claim 9 or 10, wherein there are N quasi-target base stations among the M neighbor base stations; each of the N quasi-target base stations satisfies a condition: the service performance obtained by accessing the terminal to the quasi-target base station is better than that obtained by accessing the current service base station; n is a positive integer not greater than M;

wherein K is a positive integer not greater than N.

16. The apparatus of claim 9 or 10, wherein the processor is further configured to:

after a target base station to be switched by the terminal is determined from the M adjacent base stations, a switching request is sent to the target base station through the transceiver; wherein, the switching request includes information of a network slice instance corresponding to the terminal;

receiving a switching response returned by the target base station through the transceiver; wherein the switching response comprises information of a network slice instance to be accessed by the terminal;

17. A computer-readable storage medium having stored thereon computer-executable instructions which, when invoked by a computer, cause the computer to perform the method of any of claims 1 to 8.