COMMUNICATION METHOD AND SYSTEM, BASE STATION AND TERMINAL

Abstract

The present invention relates to a communication method and system, a base station, and a terminal, and to the technical field of communication. The disclosed method includes: a first base station transmitting broadcast information including one or more NIDs and PLMNs corresponding to one or more SNPNs supported by the first base station; the first base station receiving a connection request sent from a terminal indicating that the first base station supports one or more SNPNs subscribed to by the terminal; in response to the connection request, the first base station establishing an RRC connection to the terminal; the first base station receiving RRC connection establishment completion information sent from the terminal, the RRC connection establishment completion information including the NIDs and PLMNs corresponding to the SNPNs the terminal selects to access; and in response to the RRC connection establishment completion information, the first base station allowing the terminal to access the SNPNs the terminal selects to access.

Description

[Technical field]

[0001] This application claims priority to an application of the People's Republic of China having Application No. 201911042164.X, filed on October 30, 2019, the disclosure of which is incorporated herein by reference in its entirety.

[0002] The present application relates to the field of communication technologies, and more particularly to a communication method and system, a base station and a terminal. Summary of the Invention [Problem to be solved by the invention]

[0003] The research goal of 5G technology is to provide communication with higher reliability and lower latency to meet the needs of different users in different industries. For example, a non-public network provided to some specific users can be designed to provide communication services according to the needs of different users in vertical industries and local area networks (LANs). An independent private network can meet the needs of users in vertical industries and specific LANs.

[0004] At present, research points considering that 5G networks will support independent non-public network (SNPN) functions in the future can be found in NR (New Radio) high-level core network technology. However, there is no solution for SNPN proposed in the current technology research on the wireless side. It is necessary to design the corresponding system process to support SNPN functions in the 5G environment. [Means for solving the problem]

[0005] The technical problem to be solved by this disclosure is to provide SNPN services to terminals in SA scenarios.

[0006] In yet another embodiment of the present application, the method includes the steps of: transmitting broadcast information by a first base station, the broadcast information comprising network identifiers (NIDs) and public domain mobile network identifiers (PLMN IDs) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station; and receiving an access request sent by the first base station from a terminal, the access request being received by the first base station from one or more SNPNs signed by the terminal. At least one of a step of indicating that the first base station supports the connection request; establishing a Radio Resource Control (RRC) connection with the terminal in response to the connection request by the first base station; receiving RRC connection establishment completion information sent from the terminal by the first base station, the RRC connection establishment completion information carrying a NID and a PLMN ID corresponding to the SNPN that the terminal has selected to access; and connecting the terminal to the SNPN that the terminal has selected to access in response to the RRC connection establishment completion information by the first base station.

[0007] In some embodiments, connecting the terminal by the first base station to the SNPN that the terminal has selected to access includes sending, by the first base station, initial user equipment (UE) information to a core network element, the initial UE information comprising the NID and the PLMN ID corresponding to the SNPN that the terminal has selected to access and used to verify whether the terminal's current access complies with a rule; and receiving, by the first base station, downlink non-access stratum transport information sent from the core network element, and connecting the terminal to the SNPN that the terminal has selected to access in response to the downlink non-access stratum transport information, the downlink non-access stratum transport information indicating that the terminal's current access complies with a rule.

[0008] In some embodiments, the NID corresponding to the SNPN that the terminal selects to access is added as a serving NID to a mobility restriction list of the downlink non-access stratum transport information. or whether the terminal's current access complies with the rules is determined in response to a comparison of the NID and the PLMN ID corresponding to the SNPN that the terminal has selected to access with the NID and the PLMN ID corresponding to one or more SNPNs signed by the terminal. .

[0009] In some embodiments, the method includes the steps of: receiving, by the first base station, a measurement report sent from the terminal, the measurement report comprising a NID corresponding to an SNPN to which the terminal applies access, a PLMN ID, and signal quality information of a communication cell; performing a handover decision to determine a communication cell corresponding to a second base station as a target communication cell in response to the measurement report by the first base station; and, if the first base station determines that a handover condition is met, transmitting a handover decision to a core network element by the first base station via the core network element to the second base station. to Takeover request Start sending handover request information to the first base station to receive the NID, the PLMN ID, and an identifier of the target communication cell, the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access; receiving, by the first base station, a handover command returned by the core network element and performing a handover process, the handover command indicating that the target communication cell is 、 and indicating that the terminal supports the SNPN to which access is applied.

[0010] In some embodiments, the first base station transmits the handover request information to the core network element via the core network element to the second base station. to Takeover request Start the step of transmitting the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access includes matching, by the first base station, the NID and the PLMN ID corresponding to the SNPN to which the terminal is connected under the first base station; And thatand if there is a match, comparing, by the first base station, the NID and the PLMN ID corresponding to the SNPN to which the terminal is connected under the first base station with the NID and the PLMN ID corresponding to each core network element, determining a core network element with the same NID and PLMN ID as the NID and the PLMN ID corresponding to the SNPN to which the terminal is connected under the first base station, and transmitting the handover request information to the core network element. Optionally, receiving, by the first BS, a configuration update signal or next generation (NG) establishment response information of each core network element, where the configuration update signal comprises information of an updated NID corresponding to each of the core network elements, or the NG establishment response information comprises information of an NID corresponding to each of the core network elements.

[0011] In some embodiments, after the first base station sends the handover request information to the core network element, determining by the core network element whether a current handover of the terminal complies with a rule according to a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal, and sending the handover request by the core network element to the second base station if the current handover of the terminal complies with a rule.

[0012] In some embodiments, the step of transmitting the handover request by the core network element to the second base station comprises matching an NID and a PLMN ID corresponding to one or more SNPNs signed by the terminal with an NID and a PLMN ID corresponding to one or more SNPNs supported by the second base station and, if the matching is successful, transmitting the handover request by the core network to the second base station; or matching the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access with an NID and a PLMN ID corresponding to an SNPN supported by the target communications cell and, if the matching is successful, transmitting the handover request by the core network to the second base station. Optionally, the second base station sends the NID corresponding to one or more SNPNs supported by the second base station to a core network element via a next generation (NG) establishment request or a radio access network (RAN) configuration update information.

[0013] In some embodiments, the handover request includes a mobility restriction list comprising the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access, and the method further includes transmitting, by the second base station, the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access. and, a NID and a PLMN ID corresponding to one or more SNPNs supported by the second base station; or depending on a result of a comparison between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to the SNPN supported by the target communication cell, determining whether to allow the terminal to take over; The method includes a step of transmitting handover request acknowledgement information to the core network element by the second base station when handover of the terminal is permitted, and transmitting a handover command to the first base station by the core network element in response to the handover request acknowledgement information.

[0014] In yet another embodiment of the present application, the method includes the steps of receiving, by a terminal, broadcast information transmitted from a first base station (BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station; and receiving from the first base station one or more SNPNs signed by the terminal in response to the broadcast information. At least one ofdetermining whether the first base station supports one or more SNPNs supported by the terminal; At least one of one or more SNPNs signed by the terminal and supported by the first base station when At least one of by the terminal; transmitting a connection request to the first base station by the terminal to establish a radio resource control (RRC) with the first base station; and transmitting RRC connection establishment completion information by the terminal to the first base station, the RRC connection establishment completion information carrying a NID and a PLMN ID corresponding to the SNPN to instruct the first base station to connect the terminal to the selected SNPN.

[0015] In some embodiments, the method further comprises: transmitting, by the terminal, one or more SNPNs signed by the terminal in response to the broadcast information. At least one of The step of determining whether the first base station supports the signature One or more SNPNs At least one of of support The method further comprises: determining whether to support the first base station based on a comparison result between the NID and the PLMN ID corresponding to one or more of the SNPNs signed by the terminal and the NID and the PLMN ID corresponding to each of one or more SNPNs supported by the first base station.

[0016] In some embodiments, the method includes transmitting, by the terminal, a measurement report to the first base station, the measurement report comprising a NID, a PLMN ID and signal quality information of a communication cell corresponding to an SNPN to which the terminal applies access, for instructing the first base station to hand over the terminal to the SNPN to which the terminal applies access.

[0017] In yet another embodiment of the present application, A base station is provided, the base station being a first base station, the first base station comprising:A transmission module for transmitting broadcast information, the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more independent non-public networks (SNPNs) supported by the first base station; and a transmission module for transmitting the one or more SNPNs signed by a terminal in response to the broadcast information by the first BS. At least one of a decision module for determining whether to support one or more SNPNs signed by the terminal; At least one of If the terminal supports one or more SNPNs signed by the terminal and supported by the first BS, At least one of a transmitting module for selecting a first BS, transmitting a connection request to the first BS, establishing a Radio Resource Control (RRC) connection with the first BS, and transmitting an RRC connection establishment completion information to the first BS, wherein the RRC connection establishment completion information instructs the first BS to connect the terminal to the selected SNPN, and the RRC connection establishment completion information includes an NID and a PLMN ID corresponding to the SNPN selected by the terminal. do .

[0018] In yet another embodiment of the present application, a receiving module for receiving broadcast information transmitted from a first base station (BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station; and one or more SNPs signed by the terminal in response to the broadcast information. At least one of N a determination module for determining whether the first base station supports one or more SNPNs signed by the terminal; At least one of of support Signed by the terminal when and is supported by the first BS. One or more SNPNs from at least one ofa transmitting module for selecting an SNPN, transmitting a connection request to the first base station, establishing a Radio Resource Control (RRC) connection with the first base station, and transmitting an RRC connection establishment completion information to the first base station, wherein the RRC connection establishment completion information provides the terminal with an NID and a PLMN ID corresponding to the SNPN selected by the terminal to instruct the first base station to connect the terminal to the selected SNPN.

[0019] Yet another embodiment of the present application provides a communication system comprising a base station according to any one of the previous embodiments and a terminal according to any one of the previous embodiments.

[0020] In some embodiments, the method further comprises a core network element that receives initial user equipment (UE) information sent from the first base station, determines whether a current access of the terminal complies with a rule based on the initial UE information, and sends downlink non-access stratum transport information to the first base station if the current access complies with a rule, the initial user equipment (UE) information corresponding to the SNPN that the terminal has selected to access and comprising the NID and the PLMN ID. Optionally, the system further comprises a second base station, wherein the core network element is further configured to receive handover request information sent from the first base station, send a handover request to the second base station in response to the handover request information, receive handover request acknowledgement information sent from the second base station, and return a handover command to the first base station, wherein the handover request information comprises the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access, and the second base station is configured to receive the handover request sent from the core network element and send the handover request acknowledgement information to the core network element when the target communication cell supports the SNPN to which the terminal applies access.

[0021] In some embodiments, the core network element determines whether the current access of the terminal matches a rule in response to a comparison of the NID and the PLMN ID corresponding to the SNPN to which the terminal selects access with the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal. Or the core network element is adapted to send information of an updated NID corresponding to the core network element to the first base station via a core network element configuration update signal, or to send an NID corresponding to the core network element to the first base station via a next generation (NG) establishment response information. .

[0022] In some embodiments, the core network element is configured to determine whether a current handover of the terminal matches a rule in response to a comparison between the NID and the PLMN ID corresponding to the SNPN to which the terminal selects access and the NID and PLMN ID corresponding to the SNPN signed by the terminal, and to send the handover request to the second base station if the current handover of the terminal matches a rule. Alternatively, the second base station determines whether to permit handover of the terminal according to a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to one or more SNPNs supported by the second base station, or according to a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to an SNPN supported by the target communication cell, and sends handover request acknowledgement information to the core network element if the handover of the terminal is permitted.

[0023] In some embodiments, the core network element is further configured to match an NID and a PLMN ID corresponding to one or more SNPNs supported by the second base station with the NID and the PLMN ID corresponding to one or more SNPNs signed by the terminal, and send a handover request to the second base station if the matching is successful; or the core network element is further configured to match an NID and a PLMN ID corresponding to an SNPN supported by the target cell with the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access, and send a handover request to the second base station if the matching is successful. Optionally, the second base station transmits the NID corresponding to one or more SNPNs supported by the second base station to a core network element via a next generation (NG) establishment request or a radio access network (RAN) configuration update. .

[0024] In yet another embodiment of the present application, a processor and a method for implementing ... A communication method according to any one of the preceding embodiments, performed by a first BS and a second BS. and a memory storing instructions for causing the processor to execute B.S. The purpose of this invention is to provide

[0025] In yet another embodiment of the present application, there is provided a terminal comprising a processor and a memory connected to the processor and storing instructions which, when executed by the processor, cause the processor to perform a communication method according to any of the embodiments.

[0026] In the present disclosure, the first BS broadcasts, through broadcast information, the NID and PLMN ID corresponding to one or more SNPNs signed by the first BS itself, and according to the one or more SNPNs signed by the terminal and the broadcast information heard by the terminal, the terminal selects the first BS for initial access, thereby accessing the corresponding SNPN. The above embodiment provides a solution for a terminal to access an SNPN, so as to realize providing services for a terminal using a non-public network by improving the existing signaling process.

[0027] Other features and advantages of the present invention will become apparent from the following detailed description of exemplary embodiments of the present disclosure, taken in conjunction with the accompanying drawings.

[0028] The accompanying drawings, which are intended to provide a further understanding of the present disclosure, form part of this specification and serve to explain the present disclosure together with illustrated embodiments of the invention and the illustrated embodiments of the present disclosure, but are not intended to be limiting thereof. [Brief description of the drawings]

[0029] [Figure 1] 1 is a simplified flowchart of a communication method according to some embodiments of the present application. [Diagram 2] 4 is a schematic flowchart of a communication method according to another embodiment of the present application; [Diagram 3] 4 is a schematic flow chart of a communication method according to a further embodiment of the present application; [Figure 4] FIG. 2 is a structural relationship diagram of a BS according to some embodiments of the present application. [Diagram 5] FIG. 2 is a structural relationship diagram of a terminal in accordance with some embodiments of the present application. [Figure 6] FIG. 1 is a structural relationship diagram of a communication system in accordance with some embodiments of the present application. [Figure 7] FIG. 2 is a structural relationship diagram of a communication system according to another embodiment of the present application. [Figure 8] FIG. 2 is a structural relationship diagram of a communication system according to a further embodiment of the present application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] The following provides a clear and complete description of the technical solutions of the embodiments of the present disclosure. The embodiments of the present disclosure are clearly described herein, rather than merely some of their embodiments. The description herein as at least one example is merely illustrative and is not intended to limit the present invention in terms of application or use. Based on the embodiments disclosed herein, all other embodiments obtained by so-called ordinary techniques without creative efforts are included in the scope of protection of the present application.

[0031] The solution proposed here is for the current common problem that does not provide a special solution on how to provide non-public network services as a terminal in 5G or SA.

[0032] In this application, a new identifier is added to the terminal side, for example, in a standalone non-public network, an NID (Network Identifier) ​​corresponding to one or more SNPNs of a registered and authenticated terminal. The identifier is established when the terminal is signed up and registered, and may be maintained by the core network and the terminal, respectively. During the access and handover of the terminal, the base station may be configured to acquire the identifier via the core network, as described below.

[0033] A new identifier is added on the network side, for example an NID corresponding to one or more SNPNs supported by the BS. An SNPN network is uniquely identified via the NID and the corresponding PLMN identifier.

[0034] An embodiment of the communication method of the present invention will be described below with reference to FIG.

[0035] 1 is a flowchart showing an embodiment of the communication method of the present application. As shown in FIG. 1, this embodiment includes steps S102 and S103.

[0036] In step S102, the first BS transmits broadcast information, and in response, the terminal listens to the broadcast information transmitted from the first BS.

[0037] The broadcast information comprises a NID and a PLMN ID corresponding to each of one or more SNPNs supported by the first BS. One or more Equipped with NID. If If there are multiple NIDs, a list of NIDs is formed. For example, the NIDs supported by the first BS are provided in a SIB (System Information Block) as SIB1. The broadcast information is determined as an existing standard, for example, PLMN (Public Domain Mobile Network).

[0038] In S104, the terminal 、 One or more SNPNs signed by the terminal in response to received broadcast information Decide whether to support at least one of the .

[0039] In some embodiments, after the broadcast information is received, the terminal parses the broadcast information to obtain a NID and a PLMN ID corresponding to each of the one or more SNPNs supported by the first BS. The terminal determines whether the first BS supports the one or more SNPNs signed by the terminal according to a comparison result between the NID and the PLMN ID corresponding to the one or more SNPNs supported by the first BS. If the NID and the PLMN ID corresponding to the one or more SNPNs supported by the first BS include the NID and the PLMN ID corresponding to the one or more SNPNs signed by the terminal, the first BS determines whether the one or more SNPNs signed by the terminal are supported by the first BS. At least one of otherwise the first BS supports one or more SNPNs signed by the terminal. At least one of does not support.

[0040] In step S106, the first BS receives one or more SNPNs signed by the terminal. At least one of If the terminal selects the first BS in favor of the first BS, the terminal sends a connection request to the first BS. As a result, the first BS receives the connection request sent from the terminal.

[0041] In addition to the first BS, one or more SNPNs signed by the terminal At least one of and the above process can be used as an improvement of an existing communication cell selection or communication cell reselection process, i.e., if the terminal is currently in a communication cell selection scenario, the first BS or another BS is selected according to the rules of the communication cell selection process, or if the terminal is currently in a communication cell reselection scenario, the first BS or another BS is selected according to the rules of the communication cell selection process.

[0042] The following improvements are applied to the existing communication cell selection process or communication cell reselection process, and the existing standard parts without modification are taken as reference. The terminal periodically listens to the NIDs and PLMN IDs of one or more SNPNs in the broadcast information, and determines whether it is a terminal that has signed an SPNP in one or more SNPNs corresponding to the NIDs and PLMN IDs in the broadcast information based on the NIDs and PLMN IDs corresponding to one or more signed SNPNs. If so, it selects one of the NIDs and PLMN IDs in the broadcast information that corresponds to one of the NIDs and PLMN IDs in the broadcast information. SNPN is , are selected for access depending on the rules for communication cell selection or communication cell reselection.

[0043] The terminal sends a connection request to the first BS as an RRC establishment request (Radio Resource Control establishment request). For this information reference is made to the prior art.

[0044] The first BS connects to a terminal corresponding to the SNPN in response to a connection request, as described below.

[0045] In step S108, in response to the connection request, the first BS establishes an RRC connection with the terminal.

[0046] In step S110, the terminal sends an RRC connection establishment completion information to the first BS, and the first BS receives the RRC connection establishment completion information sent from the terminal. The RRC connection establishment completion information indicates the SNPN that the terminal selects to access. The corresponding NID and PLMN ID The following may be executed.

[0047] In step S112, the first BS connects the terminal to the SNPN that the terminal selects to access according to the RRC connection establishment completion information.

[0048] As shown in FIG. 2, in some embodiments, an RRC connection is established with the terminal to connect the terminal to the SNPN of choice for access. No. 1 The BS process includes steps S202 to S210.

[0049] In step S202, the first BS sends a connection control establishment command, such as RRC Establishment (Radio Resource Control Establishment). Prior art may be used as a reference for this step. For example, No. 1 The BS may decide whether to allow access of the terminal depending on information such as the load situation.

[0050] In step S204, the terminal sends radio resource control establishment completion information, such as RRC establishment completion, to the first BS. This step may be based on the prior art.

[0051] The radio resource control establishment completion information comprises an NID and a PLMN ID corresponding to the SNPN that the terminal selects to access. If the first BS supports multiple SNPNs, the terminal selects an SNPN that matches the signature SNPN of the accessing terminal.

[0052] In step S206, the first BS sends initial user equipment (UE) information to a core network element.

[0053] The initial UE information, for example an "initial UE message", comprises an NID and a PLMN ID corresponding to the SNPN from which the terminal selects access. Supports SNPN The NID is added to the existing signal.

[0054] In step S208, the core network element determines whether the current access of the terminal complies with the rule according to the initial UE information.

[0055] For example, the core network element is an AMF (Access and Mobility Management Function). In some embodiments, the core network element determines whether the current access of the terminal complies with the rule according to a comparison result between the NID and PLMN ID of the SNPN to which the terminal selects access and the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal. If the NID and PLMN ID corresponding to the SNPN to which the terminal selects access is within the range of the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal, the core network element determines that the current access of the terminal complies with the rule; otherwise, the current access does not complies with the rule. The core network element authenticates the terminal through the above process.

[0056] In step S210, if the current access of the terminal complies with the rule, the core network element sends downlink non-access stratum transport information to the first BS. In response, the first BS receives the downlink non-access stratum transport information sent from the core network.

[0057] The downlink non-access stratum transport information is "downlink NAS transport". The NID corresponding to the SNPN that the terminal selects to access is added to the mobility restriction list communication cell in "downlink NAS transport" as a serving NID ("serving NID"). For this information, reference is made to the prior art. In the above embodiment, in the process of initial access of the terminal, the NID corresponding to the SNPN that the terminal selects to access is added to the "initial UE message", and the authentication process of the terminal performed by the core network element is added.

[0058] In the above embodiment, the first BS broadcasts the NID and PLMN ID corresponding to each of one or more SNPNs supported by itself through broadcast information, and the terminal selects the first BS for initial access according to the one or more SNPNs signed by the terminal and the broadcast information heard by the terminal, thereby accessing the corresponding SNPN. The above embodiment provides a solution for the terminal to access the SNPN, so as to realize providing services to the terminal using the non-public network by improving the existing signaling process.

[0059] This disclosure provides a method for implementing a terminal handover between SNPNs of different BSs. In a SA scenario, the handover is a NG-based (next generation) handover, which is described below with reference to FIG.

[0060] The handover process of the NG criteria (next generation) will be described below with reference to FIG.

[0061] 3 is a flowchart of a communication method according to another embodiment of the present disclosure. As shown in FIG. 3, the method of the embodiment includes steps S302 to S310.

[0062] In step S302, the terminal transmits a measurement report to the first BS, and in response, the first BS receives the measurement report from the terminal.

[0063] The measurement report comprises the NID, the PLMN ID and the signal quality information of the communication cell corresponding to the SNPN to which the terminal applies the access. For other information that may be included in the measurement report, reference may be made to the prior art. In the SA scenario, handover between different SNPNs is not supported, i.e., the NID and the PLMN ID must be the same for the target BS and the source BS (first BS). The NID corresponding to the SNPN to which the terminal applies the access is added to the measurement report, so that the terminal may be handed over to the same SNPN.

[0064] In step S304, the first BS Handover Judgment to determine a communication cell corresponding to the second BS as a target communication cell according to the measurement report by the first BS, and send handover request information to the core network element if the first BS determines that the handover upper limit is met.

[0065] For example, the core network is an AMF. The handover request information comprises, for example, an NID and a PLMN ID corresponding to the SNPN to which the terminal applies to access, "handover is requested", and an identifier of the target communications cell. Make a handover decision The details of how the first BS determines the communication cell corresponding to the second BS as the target cell can be referred to the prior art, and the repeated description will be omitted here.

[0066] In case of SA, different core network representations may also support different SNPNs. The NID corresponding to the core network element is sent to the first BS via the NG establishment response information, or the updated NID information corresponding to the core network element is sent to the first BS via the configuration update signal of the core network element. The configuration update signal of the core network element is, for example, "Update AMF Configuration", and the NG setup response information is, for example, "NG Establishment Request". These messages comprise the NID list corresponding to the core network element.

[0067] In some embodiments, the first BS matches the NID and PLMN ID corresponding to the SNPN to which the terminal applies access with the NID and PLMN ID corresponding to the SNPN to which the terminal is connected under the first BS. If there is a match, the first BS compares the NID and PLMN ID corresponding to the SNPN to which the terminal is connected under the first BS with the NID and PLMN ID corresponding to each core network element, determines the core network element with the same NID and PLMN ID as the SNPN to which the terminal is connected under the first BS, and sends the handover request information to the core network element. The first BS verifies the NID of the SNPN to which the terminal applies access to ensure that the SNPN to which the terminal applies access is consistent with the SNPN currently accessed. Then, an appropriate core network element to which the handover request information is sent is selected.

[0068] In step S306, the core network element sends a handover request to the second BS according to the handover request information.

[0069] In some embodiments, depending on the result of comparing the NID and PLMN ID corresponding to the SNPN to which the terminal applies to access with the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal, the core network element determines whether the current handover of the terminal complies with the rule, and sends a handover request to the second BS if the current handover of the terminal complies with the rule. If the NID and PLMN ID corresponding to the SNPN to which the terminal applies to access are identical to the NID and PLMN ID corresponding to an SNPN signed by the terminal, it is determined that the current handover complies with the rule. The core network controls the handover of the terminal through the authentication of the terminal.

[0070] In some embodiments, the BS sends NIDs corresponding to one or more SNPNs supported by the BS to a core network element via a NG establishment request ("NG establishment request"). The core network element may return a NG establishment response ("NG establishment response") to the BS. Alternatively, the BS sends NIDs corresponding to one or more SNPNs supported by the BS to the core network via a RAN configuration update information ("RAN configuration update"). The core network element sends a RAN configuration update confirm information ("RAN configuration update") to the BS. The BS sends NIDs corresponding to the SNPNs it supports to the core network, and the core network can control the handover of the terminal. The BS sends NIDs corresponding to the SNPNs supported by each communication cell to the core network element via the above method.

[0071] In some embodiments, the core network element matches the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal with the NID and PLMN ID corresponding to one or more SNPNs supported by the second BS, and if the match is successful, sends a handover request by the core network element to the second BS. Alternatively, the core network element matches the NID and PLMN ID corresponding to the SNPN to which the terminal applies access with the NID and PLMN ID corresponding to the SNPN supported by the target communications cell, and if the match is successful, sends a handover request by the core network element to the second BS.

[0072] The handover request may be, for example, a "handover request", and may include an NID corresponding to the SNPN to which the terminal applies access. The NID corresponding to the SNPN to which the terminal applies access may be added to a "mobility restriction list". In the current SA scenario, cross-SNPN handover of a terminal is not supported. That is, the NID corresponding to the SNPN to which the terminal applies access must be the same as the NID corresponding to the SNPN to which the terminal is currently connected. The NID corresponding to the SNPN to which the terminal applies access is the serving NID.

[0073] In step S308, the second BS sends a handover request acknowledgement information to the core network element, and in response, the core network element receives the handover request acknowledgement information sent from the second BS.

[0074] In some embodiments, the second BS determines whether to allow the handover of the terminal according to the NID and PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and PLMN ID corresponding to one or more SNPNs supported by the second BS, and sends a handover request acknowledgement to the core network element if the handover of the terminal is allowed. If the NID and PLMN ID of one or more SNPNs supported by the second BS have a common point with the NID and PLMN ID corresponding to the SNPN to which the terminal applies access, it is determined that the handover of the terminal is allowed. Alternatively, the second BS determines whether to allow the handover of the terminal according to the NID and PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and PLMN ID corresponding to the SNPN supported by the target communication cell, and sends a handover request acknowledgement to the core network if the handover of the terminal is allowed. The second BS can control the handover of the terminal through terminal authentication.

[0075] In step S310, the core network element returns a handover command to the first BS in response to the handover request acknowledgement information, and in response, the first BS receives the handover command returned by the core network element in response to the handover request acknowledgement information to perform handover to the terminal to the SNPN supported by the second BS.

[0076] The takeover request may be, for example, a "takeover command" and may refer to prior art for the subsequent takeover process.

[0077] In the above NG criteria handover embodiment, the source BS (first BS) sends handover request information to the core network, and the core network can control the selection of the target BS (second BS) or target communication cell according to the measurement report of the terminal. The target BS can determine whether to allow access through the authentication of the terminal. By adding the NID corresponding to the SNPN that the terminal applies to access in the existing handover signal, the handover process of the terminal between the SNPNs of different BSs can be achieved.

[0078] The present disclosure also provides a BS, which is described in detail below with reference to FIG.

[0079] 4 is a structural relationship diagram of a BS according to some embodiments of the present disclosure. As shown in FIG. 4, in this embodiment, BS 40 includes a transmitting module 410, a receiving module 420, and a connecting module 430. BS 40 is used as a first BS in the above embodiment.

[0080] The transmitting module 410 is adapted to transmit broadcast information, the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to each of one or more separate non-public networks (SNPNs) supported by the first BS.

[0081] The receiving module 420 is adapted to receive a connection request sent from a terminal, the connection request being transmitted to a first BS via one or more SNPNs signed by the terminal. At least one of This indicates support for the

[0082] In one or more embodiments, the terminal may receive one or more SNPNs signed by the terminal. At least one of and determine whether the first BS supports one or more SNPNs signed by the terminal according to a comparison result between the NID and PLMN ID corresponding to the first BS and the NID and PLMN ID corresponding to each of the one or more SNPNs supported by the first BS.

[0083] The connection module 430 establishes a radio resource control (RRC) connection with the terminal in response to the connection request, receives RRC connection establishment completion information sent from the terminal, and connects the terminal to the SNPN that the terminal selects to access in response to the RRC connection establishment completion information. The RRC connection establishment completion information carries the NID and PLMN ID corresponding to the SNPN that the terminal selects to access.

[0084] In some embodiments, the sending module 410 is further configured to send initial user equipment (UE) information to the core network element. The initial UE information comprises an NID and a PLMN ID corresponding to the SNPN to which the terminal selects access, and is used to verify that the terminal's current access complies with the rules. The receiving module 420 is further configured to receive downlink non-access stratum transport information sent from the core network element and connecting the terminal to the SNPN to which the terminal selects access in response to the downlink non-access stratum transport information. The downlink non-access stratum transport information indicates that the terminal's current access complies with the rules.

[0085] In some embodiments, whether the terminal's current access complies with the rules is determined as a function of a comparison of the NID and PLMN ID corresponding to the SNPN to which the terminal selects access with the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal.

[0086] In some embodiments, the receiving module 420 can be further adapted to receive a measurement report sent from the terminal, the measurement report comprising an NID corresponding to an SNPN to which the terminal applies access, a PLMN ID, and signal quality information of a communication cell. The sending module 410 performs a handover decision in response to the measurement report by the first BS to determine a communication cell corresponding to the second BS as a target communication cell, and sends a handover request information to a core network element when the first BS determines that a handover condition is met. Lever Through network elements To the 2nd BS Request for handover start The handover request information comprises an NID and a PLMN ID corresponding to the SNPN to which the terminal applies access, and an identifier of a target communications cell.

[0087] In some embodiments, the sending module 410 matches the NID and PLMN ID corresponding to the SNPN to which the terminal applies access with the NID and PLMN ID corresponding to the SNPN to which the terminal is connected under the first BS, and if there is a match, compares the NID and PLMN ID corresponding to the SNPN to which the terminal is connected under the first BS with the NID and PLMN ID corresponding to each core network, determines the core network having the same NID and PLMN ID as the NID and PLMN ID corresponding to the SNPN to which the terminal is connected under the first BS, and sends the handover request information to the core network.

[0088] In some embodiments, the receiving module 420 further receives a configuration signal or NG establishment response information of each core network element, where the configuration signal comprises updated NID information corresponding to each core network element, and the NG establishment response information comprises NID information corresponding to each core network element.

[0089] In some embodiments, the core network element determines whether the current handover of the terminal complies with the rules in response to a comparison of the NID and PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal, and sends a handover request to the second BS if the current handover of the terminal complies with the rules.

[0090] In some embodiments, the core network element matches the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal with the NID and PLMN ID corresponding to one or more SNPNs supported by the second BS, and if the match is successful, sends a handover request by the core network element to the second BS. Alternatively, the core network element matches the NID and PLMN ID corresponding to the SNPN to which the terminal applies access with the NID and PLMN ID corresponding to the SNPN supported by the target communications cell, and if the match is successful, sends a handover request by the core network element to the second BS.

[0091] In some embodiments, the second BS sends an NID corresponding to one or more SNPNs supported by the second BS to the core network element via an NG establishment request, or the second BS sends an NID corresponding to one or more SNPNs supported by the second BS to the core network element via a RAN configuration update.

[0092] In some embodiments, the handover request includes a mobility restriction list. The mobility restriction list includes NIDs and PLMN IDs corresponding to SNPNs to which the terminal applies access, and the second BS receives the NIDs and PLMN IDs corresponding to SNPNs to which the terminal applies access. and PLMN ID and A NID corresponding to one or more SNPNs supported by the second BS and PLMN ID and or depending on a comparison between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to one or more SNPNs supported by the target communication cell, It determines whether to allow the takeover of the terminal, and if the takeover of the terminal is allowed, sends takeover request approval information to the core network element.

[0093] The present disclosure also provides a terminal, which is described in more detail below with reference to FIG.

[0094] 5 is a structural relationship diagram of a terminal according to some embodiments of the present disclosure. As shown in FIG. 5, the terminal 50 in this embodiment includes a receiving module 510, a determining module 520, and a transmitting module 530.

[0095] The receiving module 510 is adapted to receive broadcast information transmitted from a first base station (BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to each of one or more separate non-public networks (SNPNs) supported by the first BS.

[0096] The determination module 520 determines, in response to the broadcast information, that the first BS has one or more SNPNs signed by the terminal. At least one of The committee is tasked with determining whether or not to support the proposal.

[0097] In some embodiments, the determination module 520 determines whether the first BS has determined that the one or more SNPNs signed by the terminal are associated with a PLMN ID corresponding to the one or more SNPNs signed by the terminal, in response to a comparison of the NID and PLMN ID corresponding to each of the one or more SNPNs supported by the first BS. At least one ofThe committee is tasked with determining whether or not to support the proposal.

[0098] The sending module 530 receives one or more SNPNs signed by the first BS from the terminal. At least one of If the terminal supports one or more SNPNs signed by the terminal and supported by the first BS, from at least one of The terminal selects an SNPN of the first BS, sends a connection request to the first BS, establishes a radio resource control (RRC) connection with the first BS, and sends a radio resource control (RRC) connection establishment completion information to the first BS. The RRC connection establishment completion information carries the NID and PLMN ID corresponding to the SNPN selected by the terminal to instruct the first BS to select the selected SNPN for the terminal.

[0099] In some embodiments, the transmitting module 530 is further adapted to transmit a measurement report to the first BS, the measurement report comprising the NID, PLMN ID and signal quality information of the communication cell corresponding to the SNPN that the terminal selects to access, to instruct the first BS to hand over the terminal to the SNPN that the terminal selects to access.

[0100] The present disclosure also provides a communication system, which is described in more detail below with reference to FIG.

[0101] Figure 6 is a structural relationship diagram of a communication system according to some embodiments of the present disclosure. As shown in Figure 6, the system 6 in this embodiment includes a BS 40 according to any of the above embodiments and a terminal 50 according to any of the above embodiments. The BS 40 is used as the first BS.

[0102] In some embodiments, the system 6 comprises a core network element 62 that receives initial user equipment (UE) information transmitted from the first BS, determines whether the current access of the terminal 50 complies with the rules in response to the initial UE information, and transmits downlink non-access stratum transport information to the first BS 40 if the current access of the terminal 50 complies with the rules. The initial UE information comprises an NID and a PLMN ID corresponding to the SNPN to which the terminal 50 selects access.

[0103] In some embodiments, core network element 62 is configured to determine whether the current access of terminal 50 complies with the rules in response to a comparison of the NID and PLMN ID corresponding to the SNPN to which terminal 50 has selected access with the NID and PLMN ID corresponding to one or more SNPNs signed by terminal 50.

[0104] In some embodiments, the communication system 60 further comprises a second BS 64, and the core network element 62 further receives handover request information sent from the first BS, sends a handover request to the second BS 64 in response to the handover request information, receives handover request acknowledgement information sent from the second BS 64, and returns a handover command to the first BS. The handover request information comprises an NID, a PLMN ID, and an identifier of a communication cell corresponding to the SNPN to which the terminal 50 applies access, and the second BS 64 receives the handover request sent from the core network element 62 and sends handover request acknowledgement information to the core network element 62 if the target communication cell supports the SNPN to which the terminal 50 applies access.

[0105] In some embodiments, the core network element 62 determines whether the current handover of the terminal 50 complies with the rules in response to a comparison between the NID and PLMN ID corresponding to the SNPN to which the terminal 50 applied access and the NID and PLMN ID corresponding to the SNPN signed by the terminal 50, and sends a handover request to the second BS 64 if the current handover of the terminal 50 complies with the rules.

[0106] In one embodiment, the core network element 62 is further configured to match the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal 50 with the NID and PLMN ID corresponding to one or more SNPNs supported by the second BS 64, and if the matching is successful, to send a handover request to the second BS 64, or the core network element 62 is configured to match the NID and PLMN ID corresponding to the SNPN to which the terminal 50 applies access with the NID and PLMN ID corresponding to the SNPN supported by the target communication cell, and if the matching is successful, to send a handover request to the second BS 64.

[0107] In some embodiments, the second BS 64 sends an NID corresponding to one or more SNPNs supported by the second BS 64 to the core network element 62 via a next generation (NG) establishment request or a radio access network (RAN) configuration update.

[0108] In some embodiments, the second BS 64 is further configured to determine whether to allow the handover of the terminal 50 depending on the NID and PLMN ID corresponding to the SNPN to which the terminal 50 applies access and the NID and PLMN ID corresponding to one or more SNPNs supported by the second BS, and if the handover of the terminal 50 is allowed, send a handover request acknowledgement information to the core network element 62; or the second BS 64 is configured to determine whether to allow the handover of the terminal 50 depending on the NID and PLMN ID corresponding to the SNPN to which the terminal 50 applies access and the NID and PLMN ID corresponding to the SNPN supported by the target communications cell, and if the handover of the terminal 50 is allowed, send a handover request acknowledgement information to the core network element 62.

[0109] In some embodiments, the core network element 62 sends the NID corresponding to the core network element 62 to the first BS via a core network element configuration update signal or a NG establishment response information.

[0110] In addition to the BS and terminals, the communication system of the present embodiment of the present disclosure may be implemented by various computing devices or systems, as described below with reference to FIGS.

[0111] 7 is a structural relationship diagram of a communication system according to some embodiments of the present disclosure. As shown in FIG. 7, the communication system 70 in this embodiment includes a memory 710 and a processor 720 coupled to the memory 710. The processor 720 performs a communication method according to any of the embodiments of the present disclosure based on the memory 710.

[0112] Memory 710 may comprise, for example, a system memory, a fixed non-volatile storage medium, etc. For example, the system memory stores an operating system, applications, boot loaders, databases, and other programs.

[0113] FIG. 8 is a structural relationship diagram of a communication system according to some embodiments of the present disclosure. As shown in FIG. 8, the communication system 80 in this embodiment includes a memory 810 and a processor 820, which are similar to the memory 710 and the processor 720, respectively. The communication system 80 may also be configured to include an input / output interface 830, a network interface 840, a storage interface 850, etc. These interfaces 830, 840, 850, the memory 810, and the processor 820 may be connected to each other via a bus 860. The input / output interface 830 provides connection interfaces such as a display, a mouse, a keyboard, and a touch screen. The network interface 840 provides connection interfaces for various network devices, and may be connected to a database server or a cloud storage server, for example. The storage interface 850 provides a connection interface for an external storage device such as an SD card or a USB flash disk.

[0114] The specific implementation of the BS and the terminals by means of a computer device or computer system is shown in FIG. 7 and FIG. 8 and will not be described here.

[0115] In yet another embodiment of the present application, a computer-readable non-volatile storage medium is provided that stores a computer program which, when executed in the processor, causes the processor to implement the communication method of any of the embodiments.

[0116] In yet another embodiment of the present application, there is provided a computer-readable non-volatile storage medium storing a computer program which, when executed on the processor, causes the processor to implement a method performed by the first BS and the second BS in any of the communication methods of the previous embodiments.

[0117] In yet another embodiment of the present application, there is provided a computer-readable non-volatile storage medium storing a computer program which, when executed on the processor, causes the processor to implement the method performed by the terminal in any of the communication methods described above.

[0118] As is common in the art, the embodiments of the present disclosure are provided as methods, systems, and computer program products. Accordingly, the embodiments of the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment containing both hardware and software elements. Further, the present disclosure may take the form of a computer program product embodied in one or more computer-implemented non-volatile storage media (such as disk storage, CD-ROM, optical memory, etc.) having computer-implemented non-volatile program code embodied in the computer.

[0119] The present disclosure is described with reference to flowcharts and / or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the present disclosure. Each process and / or block in the flowcharts and / or block diagrams, and combinations of processes and / or blocks in the flowcharts and / or block diagrams, may be implemented by computer program instructions. The computer program instructions may be provided to a processor of a general purpose computer, a special purpose computer, an embedded processor, or other programmable data processing device, to produce an apparatus for execution by the processor of the computer or other programmable data processing device, or to produce means for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0120] The computer program instructions may be configured to be stored in a computer readable storage medium capable of instructing a computer or other programmable data processing apparatus to operate in a particular manner to provide a manufacturing facility having instruction means for implementing the functions identified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0121] The computer program instructions, when loaded onto a computer or other programmable device, cause the computer or computer or other programmable device to perform a series of operational steps, creating a computer-implemented program such that the instructions executed on the computer or computer or other programmable device provide steps to implement the functions identified in one or more flows of the flowcharts and / or one or more blocks in the block diagrams.

[0122] The above are merely preferred embodiments of the present disclosure, and are not limited to the present disclosure. Any modifications, replacements, improvements, etc. within the spirit and principles of the present disclosure are included in the scope of protection herein.

Claims

1. transmitting broadcast information by a first base station (first BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station (first BS); receiving, by the first base station (first BS), a connection request sent from a terminal, the connection request indicating that the first base station (first BS) supports at least one of the one or more SNPNs signed by the terminal; establishing, by the first base station (first BS), a Radio Resource Control (RRC) connection with the terminal in response to the connection request; receiving an RRC connection establishment complete information sent from the terminal by the first base station (first BS), the RRC connection establishment complete information comprising a NID and a PLMN ID corresponding to a SNPN that the terminal has selected to access; connecting the terminal to the SNPN that the terminal selects to access in response to the RRC connection establishment completion information, by the first base station (first BS); receiving, by the first base station (first BS), a measurement report sent by the terminal, the measurement report comprising a NID corresponding to the SNPN to which the terminal applies access, a PLMN ID and signal quality information of a communication cell; performing a handover decision and determining a communication cell corresponding to a second base station (second BS) as a target communication cell according to the measurement report by the first base station (first BS); sending handover request information by the first base station (first BS) to a core network element to initiate a handover request to the second base station (second BS) via the core network element when the first base station (first BS) determines that a handover condition is met, and sending an identifier of the target communication cell, the handover request information comprising the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access; receiving a handover command returned by the core network element by the first base station (first BS) and performing a handover process, the handover command indicating that the target communication cell supports the SNPN to which the terminal applies access; A communication method comprising:

2. The step of connecting the terminal to the SNPN that the terminal selects to access by the first base station (first BS) comprises: sending initial user equipment (UE) information by the first base station (first BS) to a core network element, the initial user equipment (UE) information comprising the NID and the PLMN ID corresponding to the SNPN that the terminal has selected to access and used to verify whether the terminal's current access complies with a rule; The communication method according to claim 1, further comprising the step of receiving, by the first base station (first BS), downlink non-access stratum transport information sent from the core network element, and connecting the terminal to the SNPN selected by the terminal to access in response to the downlink non-access stratum transport information, wherein the downlink non-access stratum transport information indicates that the terminal's current access complies with a rule.

3. The communication method described in claim 2, wherein the NID corresponding to the SNPN selected by the terminal to access is added to the movement restriction list of the downlink non-access hierarchical transport information as a serving NID, or whether the current access of the terminal complies with the rules is determined based on a comparison result between the NID and PLMN ID corresponding to the SNPN selected by the terminal to access and the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal.

4. The step of transmitting, by the first base station (first BS), the handover request information to the core network element to initiate the handover request to the second base station (second BS) via the core network element, comprises: Matching, by the first base station (first BS), the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access, with the NID and the PLMN ID corresponding to the SNPN to which the terminal is connected under the first base station (first BS); and if there is a match, by the first base station (first BS), comparing the NID and the PLMN ID corresponding to the SNPN to which the terminal is connected under the first base station (first BS) with the NID and the PLMN ID corresponding to each of the core network elements, determining a core network element with the same NID and PLMN ID as the NID and the PLMN ID corresponding to the SNPN to which the terminal is connected under the first base station (first BS), and transmitting the handover request information to the core network element.

5. The communication method described in claim 4, further comprising a step of receiving, by the first base station (first BS), a configuration update signal or next-generation (NG) establishment response information for each of the core network elements, wherein the configuration update signal comprises information of an updated NID corresponding to each of the core network elements, or the next-generation (NG) establishment response information comprises an NID corresponding to each of the core network elements.

6. After the first base station (first BS) transmits the handover request information to the core network element, 2. The communication method according to claim 1, further comprising: determining, by the core network element, whether a current handover of the terminal conforms to a rule according to a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to one or more SNPNs signed by the terminal; and sending, by the core network element, the handover request to the second base station (second BS) if the current handover of the terminal conforms to the rule.

7. The step of transmitting the handover request to the second base station (second BS) by the core network element, Matching the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal with the NID and PLMN ID corresponding to one or more SNPNs supported by the second base station (second BS), and sending the handover request by the core network element to the second base station (second BS) if the matching is successful; or 7. The method of claim 6, further comprising the step of: matching the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access with the NID and the PLMN ID corresponding to the SNPN supported by the target communication cell, and in case of successful matching, sending the handover request by the core network element to the second base station (second BS).

8. The communication method described in claim 7, wherein the second base station (second BS) transmits the NID corresponding to one or more SNPNs supported by the second base station (second BS) to the core network element via a next generation (NG) establishment request or radio access network (RAN) configuration update information.

9. The handover request comprises a mobility restriction list comprising the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access, and further comprising: determining whether to allow a handover of the terminal by the second base station (second BS) depending on a result of a comparison between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to one or more SNPNs supported by the second base station (second BS) or depending on a result of a comparison between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and the PLMN ID corresponding to a SNPN supported by the target communication cell, sending handover request acknowledgement information to the core network element by the second base station (second BS) when allowing the handover of the terminal; The communication method according to claim 1 , further comprising the step of: transmitting a handover command to the first base station (first BS) by the core network element in response to the handover request acknowledgement information.

10. receiving, by a terminal, broadcast information transmitted from a first base station (first BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station (first BS); determining whether the first base station (first BS) supports at least one of the one or more SNPNs signed by the terminal in response to the broadcast information; selecting, by the terminal, at least one of the one or more SNPNs signed by the terminal and supported by the first base station (first BS) when the first base station (first BS) supports at least one of the one or more SNPNs supported by the terminal; sending a connection request to the first base station (first BS) by the terminal to establish a radio resource control (RRC) with the first base station (first BS); sending, by the terminal, RRC connection establishment completion information to the first base station (first BS), the RRC connection establishment completion information comprising a NID and a PLMN ID corresponding to the SNPN for the terminal to instruct the first base station (first BS) to connect the terminal to the selected SNPN; transmitting, by the terminal, a measurement report comprising a NID, a PLMN ID and signal quality information of communication cells corresponding to a SNPN to which the terminal applies access, to the first base station (first BS) to instruct the first base station (first BS) to hand over the terminal to the SNPN to which the terminal applies access.

11. The step of determining, by the terminal, whether the first base station (first BS) supports one or more SNPNs signed by the terminal in response to the broadcast information, comprises:

11. The communication method according to claim 10, further comprising: determining, by the terminal, whether the first base station (first BS) will command at least one of the one or more SNPNs supported by the terminal, depending on a comparison result between the NID and the PLMN ID corresponding to at least one of the one or more SNPNs signed by the terminal and the NID and the PLMN ID corresponding to each of the one or more SNPNs supported by the first base station (first BS).

12. A base station (BS) functioning as a first base station (first BS), the first base station (first BS) comprising: a transmission module for transmitting broadcast information, the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station (first BS); a receiving module for receiving a connection request sent from a terminal, the connection request indicating that the first base station (first BS) supports at least one of the one or more SNPNs signed by the terminal; a connection module that establishes a Radio Resource Control (RRC) connection with the terminal in response to the connection request, receives RRC connection establishment completion information sent from the terminal, and connects the terminal to a SNPN that the terminal selects to access in response to the RRC connection establishment completion information; the RRC connection establishment completion information comprises an NID and a PLMN ID corresponding to an SNPN that the terminal selects to access; The receiving module is further adapted to receive a measurement report sent from the terminal comprising a NID corresponding to the SNPN to which the terminal applies access, a PLMN ID and signal quality information of a communication cell; The transmitting module performs a handover determination, determines a communication cell corresponding to a second base station (second BS) as a target communication cell according to the measurement report by the first base station (first BS), and sends handover request information to a core network element to initiate a handover request to the second base station (second BS) via the core network element; The handover request information comprises the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and an identifier of the target communication cell when the first base station (first BS) determines that the handover conditions are met, and The receiving module further receives a handover command returned by the core network element and performs a handover process, the handover command indicating that the terminal supports the SNPN to which the target communication cell applies access.

13. A terminal comprising a receiving module, a determining module, and a transmitting module, The receiving module receives broadcast information transmitted from a first base station (first BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more independent non-public networks (SNPNs) supported by the first base station (first BS); The determination module determines whether the first base station (first BS) supports at least one of the one or more SNPNs signed by the terminal in response to the broadcast information; The sending module selects an SNPN from at least one of the one or more SNPNs signed by the terminal and supported by the first base station (first BS) when the first base station (first BS) supports at least one of the one or more SNPNs signed by the terminal, sends a connection request to the first base station (first BS), establishes a Radio Resource Control (RRC) connection with the first base station (first BS), and sends RRC connection establishment completion information to the first base station (first BS); The RRC connection establishment completion information instructs the first base station (first BS) to connect the terminal to the selected SNPN and includes an NID and a PLMN ID corresponding to the SNPN selected by the terminal; The transmitting module is further configured to transmit a measurement report to the first base station (first BS) comprising a NID corresponding to the SNPN to which the terminal applies access, a PLMN ID and signal quality information of a communication cell, and to instruct the first base station (first BS) to hand over the terminal to the SNPN to which the terminal applies access.

14. A communication system comprising a base station (BS) according to claim 12 and a terminal, the terminal comprising: a receiving module for receiving broadcast information transmitted from the first base station (first BS), the broadcast information comprising a network identifier (NID) and a public domain mobile network identifier (PLMN ID) corresponding to one or more separate non-public networks (SNPNs) supported by the first base station (first BS); a determination module for determining whether the first base station (BS) supports at least one of the one or more SNPNs signed by the terminal in response to the broadcast information; a transmission module for selecting an SNPN from at least one of the one or more SNPNs signed by the terminal and supported by the first base station (first BS) when the first base station (first BS) supports at least one of the one or more SNPNs signed by the terminal, sending a connection request to the first base station (first BS) to establish a Radio Resource Control (RRC) connection with the first base station (first BS), and sending an RRC connection establishment completion information to the first base station (first BS) to instruct the first base station (first BS) to connect the terminal to the selected SNPN, wherein the RRC connection establishment completion information comprises an NID and a PLMN ID corresponding to the SNPN selected by the terminal.

15. 15. A communication system according to claim 14, comprising: The terminal further comprises a core network element for receiving initial user equipment (UE) information sent from the first base station (first BS), determining whether a current access of the terminal meets a rule based on the initial user equipment (UE) information, and sending downlink non-access stratum transport information to the first base station (first BS) if the current access meets the rule; the initial user equipment (UE) information comprises the NID and the PLMN ID corresponding to the SNPN that the terminal selects to access; optionally, the communication system further comprises a second base station (second BS); the core network element is further configured to receive handover request information sent from the first base station (first BS), send a handover request to the second base station (second BS) in response to the handover request information, receive handover request acknowledgement information sent from the second base station (second BS), and return a handover command to the first base station (first BS); the handover request information comprises the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access; and the second base station (second BS) receives the handover request sent from the core network element and sends the handover request acknowledgement information to the core network element when the target communication cell supports the SNPN to which the terminal applies access.

16. The core network element determines whether the current access of the terminal complies with a rule depending on a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal selects access and the NID and PLMN ID corresponding to one or more SNPNs signed by the terminal, or the core network element transmits the NID corresponding to the core network element to the first base station (first BS) via a core network element configuration update signal or a next generation (NG) establishment response information.

17. The core network element determines whether the current handover of the terminal complies with a rule depending on a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal selects access and the NID and PLMN ID corresponding to the SNPN signed by the terminal, and transmits the handover request to the second base station (second BS) if the current handover of the terminal complies with the rule, or the second base station (second BS) transmits the handover request depending on a comparison result between the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and PLMN ID corresponding to one or more SNPNs supported by the second base station (second BS), or the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access and the NID and PLMN ID corresponding to a SNPN supported by the target communication cell. The communication system according to claim 15, wherein, depending on the result of the comparison with the ID, it is determined whether or not to permit handover of the terminal, and if the handover of the terminal is permitted, handover request approval information is transmitted to the core network element.

18. The core network element further matches a NID and a PLMN ID corresponding to one or more SNPNs supported by the second base station (second BS) with the NID and the PLMN ID corresponding to one or more SNPNs signed by the terminal, and sends a handover request to the second base station (second BS) if the matching is successful; or 18. The communication system according to claim 17, wherein the core network element is further adapted to match an NID and a PLMN ID corresponding to a SNPN supported by the target communication cell with the NID and the PLMN ID corresponding to the SNPN to which the terminal applies access, and to send a handover request to the second base station (second BS) if the matching is successful, and optionally the second base station (second BS) sends the NID corresponding to one or more SNPNs supported by the second base station (second BS) to the core network element via a next generation (NG) establishment request or a radio access network (RAN) configuration update information.

19. A processor; A base station (BS) comprising: a memory connected to said processor and storing instructions which, when executed by said processor, cause said processor to carry out a communication method according to any one of claims 1 to 5 and 8 to 9.

20. A processor; A terminal comprising: a memory connected to said processor and storing instructions which, when executed by said processor, cause said processor to carry out a communication method according to claim 10 or 11.

Images