WO2021082528A1 - 通信方法、系统以及基站、终端 - Google Patents

通信方法、系统以及基站、终端 Download PDF

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Publication number
WO2021082528A1
WO2021082528A1 PCT/CN2020/101569 CN2020101569W WO2021082528A1 WO 2021082528 A1 WO2021082528 A1 WO 2021082528A1 CN 2020101569 W CN2020101569 W CN 2020101569W WO 2021082528 A1 WO2021082528 A1 WO 2021082528A1
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WIPO (PCT)
Prior art keywords
terminal
base station
cag
access
handover
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PCT/CN2020/101569
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English (en)
French (fr)
Inventor
刘胜楠
蒋峥
陈鹏
佘小明
Original Assignee
中国电信股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 中国电信股份有限公司 filed Critical 中国电信股份有限公司
Priority to JP2022525748A priority Critical patent/JP2023500330A/ja
Priority to EP20882757.6A priority patent/EP4044686A4/en
Priority to US17/772,335 priority patent/US20220417834A1/en
Publication of WO2021082528A1 publication Critical patent/WO2021082528A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/18—Processing of user or subscriber data, e.g. subscribed services, user preferences or user profiles; Transfer of user or subscriber data
    • H04W8/186—Processing of subscriber group data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/10—Access restriction or access information delivery, e.g. discovery data delivery using broadcasted information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/06—Authentication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/08—Access security
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/11—Allocation or use of connection identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/14—Reselecting a network or an air interface
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel

Definitions

  • the present disclosure relates to the field of communication technology, and in particular to a communication method, system, base station, and terminal.
  • the research goal of 5G technology is to provide higher reliability and lower latency communication to meet the needs of different users in different industries.
  • non-public networks dedicated to certain specific users can be designed for communication services.
  • non-public networks under non-independent networking can meet the needs of specific users in the network coverage.
  • Closed Access Group (CAG) can be used to describe this concept.
  • Users belonging to CAG cells can choose according to their registration information Using the public network to access the network or using the CAG cell to access the network, operators can provide non-public network access for special construction scenarios under the coverage of the public network (such as large shopping malls, SOHO, etc.) by building CAG cells.
  • a technical problem to be solved by the present disclosure is to propose a non-independent networking solution to provide CAG services for terminals.
  • a communication method including: a first base station sends a broadcast message, the broadcast message includes: the identity of one or more closed access group CAGs supported by the first base station and a public land mobile network PLMN Identification; the first base station receives a connection request sent by the terminal, the connection request indicates that the first base station supports one or more CAGs subscribed by the terminal; the first base station establishes a radio resource control RRC connection with the terminal according to the connection request; the first base station receives the terminal sent
  • the RRC establishment complete message in the RRC establishment complete message carries the identification of the CAG that the terminal selects to access and the PLMN identification; the first base station allows the terminal to access the CAG that the terminal selects to access according to the RRC establishment complete message.
  • the first base station allows the terminal to access the CAG that the terminal selects to access includes: the first base station sends an initial user equipment message to the core network element, and the initial user equipment message includes: the identification of the CAG that the terminal selects to access And PLMN identification, used to verify whether the terminal access is legal or not; the first base station receives the downlink non-access layer transmission information sent by the core network element, and allows the terminal to access the terminal according to the downlink non-access layer transmission information.
  • CAG where the downlink non-access transmission information indicates that the terminal access is legal this time.
  • the permitted CAG list of the terminal and the access mode identifier of the terminal are added to the mobility restriction list of the downlink non-access stratum transmission information, and the permitted CAG list includes the identifiers of one or more CAGs and PLMN identifiers subscribed by the terminal.
  • the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed.
  • whether the terminal's current access is legal or not is determined based on the comparison result of the CAG ID and the PLMN ID that the terminal chooses to access with the approved CAG list of the terminal; wherein, the approved CAG list includes: one subscribed by the terminal Or multiple CAG identities and PLMN identities.
  • the method further includes: the first base station receives a measurement report sent by the terminal, the measurement report includes: the terminal measures the CAG identification, PLMN identification, and signal quality information corresponding to surrounding cells; the first base station performs handover according to the measurement report The threshold value is judged and the target cell is determined to be the cell corresponding to the second base station; when the first base station judges that it meets the handover conditions, it sends a handover request to the second base station.
  • the handover request includes: the terminal's approved CAG list, and allows CAG
  • the list includes: one or more CAG identities and PLMN identities subscribed by the terminal; the first base station receives the handover request confirmation information returned by the second base station, and switches the terminal to the target cell according to the handover request confirmation information.
  • the handover request confirmation information indicates the second The base station supports one or more CAG identities and PLMN identities subscribed by the terminal.
  • the handover request further includes: an access mode identifier of the terminal, the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed, and the method further includes: the second base station determines according to the access mode identifier The terminal can only access CAG.
  • the first base station sends the handover request confirmation message, or, according to the comparison result of the CAG identification supported by the target cell and the PLMN identification and the terminal's approved CAG list, determines whether the terminal is allowed to switch.
  • a base station sends a handover request confirmation message.
  • the first base station judges the handover threshold value according to the measurement report and determines that the target cell is the cell corresponding to the second base station.
  • sending a handover request to the second base station includes: The first base station judges the handover threshold according to the terminal's measurement of the CAG identification corresponding to the surrounding cells and the matching result of the PLMN identification with the terminal's approved CAG list, and the terminal's measurement of the signal quality information corresponding to the surrounding cells. Next, select the cell corresponding to the second base station as the target cell, and send a handover request to the second base station; wherein the approved CAG list of the terminal is obtained by the first base station through the initial context establishment request sent by the core network element.
  • the method further includes: the first base station receives a measurement report sent by the terminal, the measurement report includes: the terminal measures the CAG identification, PLMN identification, and signal quality information corresponding to surrounding cells; the first base station performs handover according to the measurement report
  • the threshold value is judged and the target cell is determined to be the cell corresponding to the third base station; when the first base station judges that it meets the conditions of the handover threshold value, it sends the handover demand information to the core network element to pass the core network element to the The third base station initiates a handover request, and the handover requirement information includes: the identification of the target cell; the first base station receives the handover instruction returned by the core network element and executes the handover process, where the handover instruction indicates that the target cell supports the CAG contracted by the terminal.
  • the method further includes: the core network element determines whether the current handover of the terminal is legal according to the comparison result of the identity of one or more CAGs supported by the third base station and the PLMN identity and the approved CAG list of the terminal, Or, according to the comparison result of the CAG ID supported by the target cell and the PLMN ID and the approved CAG list of the terminal, it is determined whether the current handover of the terminal is legal, and if the current handover of the terminal is legal, the handover request is sent to the third base station.
  • the handover request further includes: the access mode identifier of the terminal, the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed; the third base station determines that the terminal can only access according to the access mode identifier CAG, according to the identification of one or more CAGs supported by the third base station and the comparison result of the PLMN identification with the list of approved CAGs of the terminal, determine whether to allow terminal handover, and send to the core network element if the terminal handover is allowed Handover request confirmation information, or, according to the comparison result of the CAG ID and PLMN ID supported by the target cell and the approved CAG list of the terminal, determine whether to allow the terminal to handover, in the case of allowing the terminal to handover under,.
  • the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed
  • the third base station determines that the terminal can only access according to the access mode identifier CAG, according to the identification of one or more CAGs supported by the
  • the third base station sends the identification of one or more CAGs supported by the third base station to the core network element through the next-generation NG interface establishment request; or, the third base station sends the wireless interface configuration update information to the core network element.
  • the identification of one or more CAGs supported by the third base station is sent to the core network element.
  • a communication method including: a terminal receives a broadcast message sent by a first base station, and the broadcast message includes: the identity and public information of one or more closed access group CAGs supported by the first base station.
  • the terminal determines whether the first base station supports one or more CAGs subscribed by the terminal according to the broadcast message; in the case that the first base station supports one or more CAGs subscribed by the terminal, the terminal subscribes from the terminal and first Select a CAG from the CAG supported by the base station; the terminal sends a connection request to the first base station to establish a radio resource control RRC connection with the base station; the terminal sends an RRC establishment complete message to the first base station, where the RRC establishment complete message carries the terminal selection access
  • the CAG identifier and the PLMN identifier indicate the first base station to connect the terminal to the CAG that the terminal selects to access.
  • the terminal determining whether the first base station supports one or more CAGs subscribed by the terminal according to the broadcast message includes: the terminal according to the CAG identification supported by the first base station and the comparison result of the PLMN identification with the approved CAG list of the terminal, It is determined whether the first base station supports one or more CAGs subscribed by the terminal; the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the method further includes: the terminal sends a measurement report to the first base station, the measurement report includes: the terminal measures the CAG identification, PLMN identification, and signal quality information corresponding to surrounding cells for the first base station to perform handover of the terminal .
  • a base station including: a sending module, configured to send a broadcast message, the broadcast message including: one or more closed access group CAG identities and public land mobile supported by the first base station Network PLMN identification; receiving module, used to receive the connection request sent by the terminal, the connection request indicates that the first base station supports one or more CAGs subscribed by the terminal; the connection module, used to establish a radio resource control RRC connection with the terminal according to the connection request, The RRC establishment complete message sent by the terminal is received, and the terminal is allowed to access the CAG selected by the terminal according to the RRC establishment complete message, where the RRC establishment complete message carries the CAG identification and the PLMN identification that the terminal selects to access.
  • a sending module configured to send a broadcast message, the broadcast message including: one or more closed access group CAG identities and public land mobile supported by the first base station Network PLMN identification
  • receiving module used to receive the connection request sent by the terminal, the connection request indicates that the first base station supports one or more CAGs subscribed by the terminal
  • a terminal including: a receiving module, configured to receive a broadcast message sent by a first base station, the broadcast message including: one or more closed access group CAGs supported by the first base station Identification and public land mobile network PLMN identification; the determining module is used to determine whether the first base station supports one or more CAGs subscribed by the terminal according to the broadcast message; the sending module is used to support one or more CAGs subscribed by the terminal at the first base station In the case of, select a CAG from the CAG subscribed by the terminal and supported by the first base station, send a connection request to the first base station, establish a radio resource control RRC connection with the base station, and send an RRC establishment complete message to the first base station, where RRC The establishment completion message carries the identification of the CAG that the terminal selects to access and the identification of the PLMN, and instructs the first base station to connect the terminal to the CAG that the terminal selects to access.
  • a receiving module configured to receive a broadcast message sent by a first base station, the broadcast message
  • a communication system including: the base station of any of the foregoing embodiments, and the terminal of any of the foregoing embodiments.
  • the base station is a first base station
  • the system further includes: a core network element, configured to receive an initial user equipment message sent by the first base station, and determine whether the terminal access is legal this time according to the initial user equipment message; In the case that the terminal access is legal this time, the core network element sends downlink non-access stratum transmission information to the first base station, where the initial user equipment message includes: the CAG and PLMN identifiers that the terminal selects to access.
  • the initial user equipment message further includes: the core network element is used to determine whether the terminal access is legal according to the comparison result of the CAG identification and the PLMN identification that the terminal selects to access with the approved CAG list of the terminal
  • the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the system further includes: a second base station, configured to receive a handover request sent by the first base station, and determine whether to allow terminal handover according to the handover request; if the second base station allows terminal handover, to the first base station The base station returns the handover request confirmation message, where the handover request includes the approved CAG list of the terminal, and the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • a second base station configured to receive a handover request sent by the first base station, and determine whether to allow terminal handover according to the handover request; if the second base station allows terminal handover, to the first base station The base station returns the handover request confirmation message, where the handover request includes the approved CAG list of the terminal, and the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the handover request further includes: an access mode identifier of the terminal, and the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed; the second base station is used to determine that the terminal can only Access CAG, according to the comparison result of the identification of one or more CAGs supported by the second base station and the PLMN identification and the list of approved CAGs of the terminal, it is determined whether the terminal is allowed to switch.
  • the core network element is also used to receive the handover requirement information sent by the first base station, send a handover request to the third base station according to the handover requirement information, and receive the handover request confirmation information sent by the third base station;
  • the confirmation message returns the handover instruction to the first base station.
  • the core network element is used to determine whether the current handover of the terminal is legal according to the comparison result of one or CAG ID supported by the third base station and the PLMN ID and the approved CAG list of the terminal. If it is legal, a handover request is sent to the third base station; the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the system further includes: a third base station for receiving a handover request from a core network element, where the handover request includes the approved CAG list of the terminal and the access mode identifier of the terminal, and the access mode identifier includes the indication Can only access the CAG access mode ID; according to the access mode ID, it is determined that the terminal can only access the CAG, according to the comparison of one or more CAG IDs and PLMN IDs supported by the third base station with the list of permitted CAGs of the terminal As a result, it is determined whether the terminal is allowed to switch, and if the terminal is allowed to switch, the switch request confirmation message is sent to the core network element.
  • the third base station is used to send one or more CAG identities supported by the third base station to the core network element through the next generation NG interface establishment request; or, the third base station is used to update the configuration through the wireless interface
  • the information sends the identification of one or more CAGs supported by the third base station to the core network element.
  • a communication system including: a processor; and a memory coupled to the processor for storing instructions.
  • the processor executes any of the aforementioned implementations. Example of communication method.
  • a non-transitory computer-readable storage medium on which a computer program is stored, wherein the program is executed by a processor to implement the communication method of any of the foregoing embodiments.
  • a base station including: a processor; and a memory coupled to the processor for storing instructions.
  • the processor executes any of the foregoing embodiments. Of the communication methods performed by the first base station, the second base station, and the third base station.
  • a non-transitory computer-readable storage medium on which a computer program is stored, where the program is executed by a processor to implement the first communication method in any of the foregoing embodiments.
  • the method performed by the base station, the second base station, and the third base station.
  • a terminal including: a processor; and a memory coupled to the processor for storing instructions.
  • the processor executes any of the foregoing embodiments. The method executed by the terminal in the communication method.
  • a non-transitory computer-readable storage medium on which a computer program is stored, where the program is executed by a terminal when the program is executed by a processor in the communication method of any of the foregoing embodiments.
  • the first base station broadcasts the identification of one or more CAGs supported by the base station through a broadcast message, and the terminal selects the first base station for initial access according to one or more CAGs subscribed by itself and the broadcast message it has monitored.
  • the terminal selects the first base station for initial access according to one or more CAGs subscribed by itself and the broadcast message it has monitored.
  • the solution of the present disclosure provides a solution for a terminal in a non-independent networking to access a non-public network, so as to realize the use of the non-public network to provide services for the terminal.
  • Fig. 1 shows a schematic flowchart of a communication method according to some embodiments of the present disclosure.
  • FIG. 2 shows a schematic flowchart of communication methods according to other embodiments of the present disclosure.
  • FIG. 3 shows a schematic flowchart of communication methods according to still other embodiments of the present disclosure.
  • FIG. 4 shows a schematic flowchart of a communication method according to still other embodiments of the present disclosure.
  • Fig. 5 shows a schematic structural diagram of a base station according to some embodiments of the present disclosure.
  • FIG. 6 shows a schematic structural diagram of a terminal according to some embodiments of the present disclosure.
  • FIG. 7 shows a schematic structural diagram of a communication system according to some embodiments of the present disclosure.
  • FIG. 8 shows a schematic structural diagram of a communication system according to other embodiments of the present disclosure.
  • FIG. 9 shows a schematic structural diagram of a communication system according to still other embodiments of the present disclosure.
  • a new identification is added on the terminal side.
  • the access mode identifier includes: CAG-only indication, which means that only CAG-only indication can be accessed. Terminals configured with this identifier can only pass CAG accesses the network.
  • the allowed CAG list (Allowed CAG list) of the terminal is added to store one or more CAG IDs (CAG IDs) corresponding to the terminal to register and pass through the authorized network.
  • CAG-only indication means that only CAG-only indication can be accessed.
  • Terminals configured with this identifier can only pass CAG accesses the network.
  • the allowed CAG list (Allowed CAG list) of the terminal is added to store one or more CAG IDs (CAG IDs) corresponding to the terminal to register and pass through the authorized network.
  • CAG IDs CAG IDs
  • the above-mentioned identification can be determined when the terminal signs and registers, and the core network and
  • CAG IDs CAG identifications
  • PLMN Public Land Mobile Network
  • FIG. 1 is a flowchart of some embodiments of the communication method of the present disclosure. As shown in Fig. 1, the method of this embodiment includes: steps S102 to S112.
  • step S102 the first base station sends a broadcast message, and accordingly, the terminal monitors the broadcast message sent by the first base station.
  • the broadcast message includes: one or more CAG identities supported by the first base station. There can be one or more CAG identities supported by the first base station. If there are more than one, a CAG ID list can be formed, which can be displayed in the SIB (System Message Block) For example, SIB1 contains the identity of the CAG supported by the first base station.
  • SIB1 contains the identity of the CAG supported by the first base station.
  • the broadcast may also include various information that has been determined in existing standards, for example, PLMN (Public Land Mobile Network, public land mobile network) identification.
  • PLMN Public Land Mobile Network, public land mobile network
  • step S104 the terminal determines whether the first base station supports one or more CAGs subscribed by the terminal according to the received broadcast message
  • the terminal determines the mode of access to the network according to the access mode identifier configured by itself.
  • the access mode identifier is an access mode identifier (CAG-only indication) that means that it can only access CAG, which means the terminal The network can only be accessed through the CAG. If the access mode identifier is empty or the access mode identifier indicating that it can only access the PLMN, the terminal can only access the network through the PLMN.
  • the terminal parses the broadcast message to obtain one or more CAG identities supported by the first base station.
  • the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • step S106 when the first base station supports one or more CAGs subscribed by the terminal and the terminal selects the first base station, the terminal sends a connection request to the first base station, and correspondingly, the first base station receives the connection request sent by the terminal.
  • the base station supporting the CAG subscribed by the terminal may have one or more other base stations besides the first base station, and the foregoing process can be used as an improvement to the existing cell selection or cell reselection process. That is, when the terminal is currently in a cell selection scenario, use the rules in the cell selection process to select the first base station or other base stations, or, when the terminal is currently in a cell reselection scenario, use the rules in the cell reselection process to select The first base station or other base stations.
  • the terminal determines the mode of access to the network according to whether it is configured with CAG-only indication. For the terminal configured with CAG-only indication, the terminal periodically monitors the CAG ID (CAG ID) in the broadcast information through its Allowed CAG list. Determine whether you belong to the CAG contracted terminal of the cell corresponding to the CAG ID in the broadcast information. If so, select the cell corresponding to the CAG ID in the broadcast information for access according to the cell selection or cell reselection rules.
  • CAG ID CAG ID
  • connection request sent by the terminal to the first base station is, for example, an RRC Setup Request (Radio Resource Control Setup Request), and the information can refer to the prior art.
  • RRC Setup Request Radio Resource Control Setup Request
  • the first base station can allow the terminal to access according to the connection request, as follows.
  • step S108 the first base station establishes an RRC connection with the terminal according to the connection request.
  • step S110 the terminal sends an RRC establishment complete message to the first base station, and correspondingly, the first base station receives the RRC establishment complete message sent by the terminal.
  • the RRC establishment complete message may carry the CAG identification and the PLMN identification that the terminal selects to access.
  • step S112 the first base station allows the terminal to access the terminal to select the CAG to access according to the RRC establishment complete message.
  • the base station establishes an RRC connection with the terminal, and the process of allowing the terminal to access the terminal to select the CAG to access includes: steps S202 to S210.
  • step S202 the first base station sends a radio resource control setup message, such as RRC Setup (radio resource control setup), to the terminal.
  • a radio resource control setup message such as RRC Setup (radio resource control setup)
  • RRC Setup radio resource control setup
  • the base station can determine whether to allow the terminal to access based on information such as load conditions. If permitted, step S204 is executed.
  • step S204 the terminal sends a radio resource control establishment complete message to the first base station, for example, RRC Setup Complete (radio resource control establishment complete).
  • RRC Setup Complete radio resource control establishment complete
  • the radio resource control establishment complete message may include the CAG identification and PLMN identification that the terminal selects to access.
  • the terminal will select a CAG matching its Allowed CAG list from the multiple CAGs supported by the first base station for access. .
  • step S206 the first base station sends an initial user equipment message to the core network element.
  • the initial user equipment message is, for example, INITIAL UE MESSAGE, and the initial user equipment message includes: the identification of the CAG and the PLMN that the terminal selects to access. In this step, the identification of the CAG that the terminal selects to access is added to the existing signaling.
  • step S208 the core network element determines whether the current access of the terminal is legal according to the initial user equipment message.
  • the core network element is, for example, AMF (Access and Mobility Management Function).
  • the core network element determines whether the current access of the terminal is legal based on the comparison result of the CAG identification and the PLMN identification that the terminal selects to access with the approved CAG list of the terminal. If the CAG ID and PLMN ID that the terminal selects to access are the same as the ID of any CAG in the approved CAG list of the terminal and the corresponding PLMN ID, it is determined that the current access of the terminal is legal, otherwise, it is illegal.
  • the core network element authenticates the terminal through the above process.
  • step S210 when the terminal access is legal this time, the core network element sends the downlink non-access layer transmission information to the first base station.
  • the first base station receives the downlink non-access stratum transmission information sent by the core network element.
  • the downlink non-access layer transmission information indicates that the terminal access is legal this time, and the first base station can access the terminal to select the CAG to access the terminal according to the downlink non-access layer transmission information.
  • the downlink non-access layer transmission information is, for example, DOWNLINK NAS TRANSPORT, DOWNLINK NAS TRANSPORT Mobility Restriction List (Mobility Restriction List) to add the allowed CAG list of the terminal (Allowed CAG list) and the access mode identifier of the terminal, the allowed CAG list includes One or more CAG identities and PLMN identities subscribed by the terminal, and the access mode identifier includes: an access mode identifier (CAG-only indication) indicating that only CAG can be accessed.
  • CAG-only indication an access mode identifier
  • This message can refer to the prior art.
  • the identification of the CAG that the terminal selects to access is added to the INITIAL UE MESSAGE, and the authentication process of the core network element to the terminal is added.
  • the first base station broadcasts one or more CAG identities and PLMN identities supported by the base station through a broadcast message
  • the terminal selects the first one or more CAGs and the monitored broadcast messages according to the one or more CAGs it has subscribed to.
  • the base station performs initial access, thereby accessing the corresponding CAG.
  • the solution of the foregoing embodiment provides a solution for a terminal in a non-independent networking to access a non-public network, and the non-public network is used to provide services for the terminal by improving the existing signaling process.
  • the present disclosure also provides a process for implementing terminal handover in CAG.
  • the handover process is divided into Xn interface-based handover and NG (Next Generation)-based handover.
  • Xn interface-based handover and NG (Next Generation)-based handover.
  • NG Next Generation
  • FIG. 3 is a flowchart of other embodiments of the communication method of the present disclosure. As shown in FIG. 3, the method of this embodiment includes: steps S302 to S308.
  • step S302 the terminal sends a measurement report to the first base station, and correspondingly, the first base station receives the measurement report sent by the terminal.
  • the measurement report includes: the terminal measures the CAG identification, PLMN identification and signal quality information corresponding to the surrounding cells, and may also include other information with reference to the prior art. Add the CAG identifier corresponding to the surrounding cells that the terminal measures in the measurement report.
  • step S304 the first base station determines the handover threshold value according to the measurement report, and if the handover condition is met, the cell corresponding to the second base station is selected as the target cell and sends a handover request to the second base station.
  • the first base station judges the handover threshold value, and determines the cell corresponding to the second base station as the target cell, which can refer to the prior art, which will not be repeated here.
  • the core network element sends downlink non-access stratum transmission information to the first base station
  • the subsequent signaling process also includes: the core network element sends an initial context setup request to the first base station, for example, INITIAL CONTEXT SETUP REQUEST ,
  • the approved CAG list of the terminal is added to the message.
  • the core network element can obtain the Allowed CAG list signed by the terminal, and notify the base station through the above message.
  • the first base station determines the handover threshold based on the terminal's measurement of the CAG identification and PLMN identification of the surrounding cells, the matching result with the terminal's approved CAG list, and the terminal's measurement of signal quality information corresponding to the surrounding cells. If the handover condition is met, a cell, that is, the cell corresponding to the second base station is selected as the target cell, and a handover request is sent to the second base station.
  • One or more CAG identities and PLMN identities supported by the second base station need to be subscribed by the terminal. There is an intersection between the one or more CAG identities and PLMN identities that the second base station supports. The selection of other information that the second base station needs to refer to, such as signal quality information, can be based on the existing Technology is determined.
  • the handover request is, for example, a Handover Request, which can add the approved CAG list of the terminal, and further can add the access mode identifier of the terminal.
  • the access mode identifier includes: an access mode identifier (CAG-only indication) indicating that only CAG can be accessed.
  • CAG-only indication an access mode identifier indicating that only CAG can be accessed.
  • a list of permitted CAGs of the terminal and an access mode identifier indicating that only CAGs can be accessed can be added to the Mobility Restriction List (Mobility Restriction List) cell.
  • Mobility Restriction List Mobility Restriction List
  • step S306 the second base station determines whether to allow the terminal to switch according to the handover request.
  • the second base station determines that the terminal can only access CAG according to the access mode identifier, and determines whether the terminal is allowed to switch according to the comparison result of the identification of one or more CAGs supported by the second base station and the PLMN identifier and the approved CAG list of the terminal .
  • the second base station determines whether to allow the terminal to switch according to the comparison result of the CAG identifier and the PLMN identifier supported by the target cell and the approved CAG list of the terminal.
  • the second base station can authenticate the terminal, thereby performing handover control on the terminal.
  • step S308 when the second base station allows the terminal handover, the second base station returns the handover request confirmation message to the first base station. Accordingly, the first base station receives the handover request confirmation message returned by the second base station and switches the terminal to In the target cell.
  • the second base station returns a Handover Request Ack (Handover Request Acknowledgement) to the first base station, and the subsequent handover procedure can refer to the prior art.
  • Handover Request Ack Handover Request Acknowledgement
  • the source base station (the first base station) can control the selection of the target base station (the second base station) or the target cell according to the measurement report of the terminal, for example, the terminal corresponding to the CAG-only indication is not selected Switch to a non-CAG cell inferior.
  • the target base station can authenticate the terminal and determine whether to allow access.
  • FIG. 4 is a flowchart of still other embodiments of the communication method of the present disclosure. As shown in Fig. 4, the method of this embodiment includes: steps S402 to S410.
  • step S402 the terminal sends a measurement report to the first base station, and correspondingly, the first base station receives the measurement report sent by the terminal.
  • the measurement report includes: the terminal measures the CAG identification, PLMN identification and signal quality information corresponding to the surrounding cells, and may also include other information with reference to the prior art. Add the CAG identifier corresponding to the surrounding cells that the terminal measures in the measurement report. Since the terminal cannot know whether the subsequent handover process is based on the Xn interface or the NG interface, the measurement report information is consistent with the foregoing embodiment.
  • step S404 the first base station judges the handover threshold according to the measurement report. If the handover condition is met, the cell of the third base station is selected as the target cell and the handover requirement information is sent to the core network element.
  • the core network element is, for example, AMF.
  • the handover requirement information is, for example, Handover Required, and includes: the identifier of the third base station.
  • step S406 the core network element sends a handover request to the third base station according to the handover demand information.
  • the core network element determines whether the current handover of the terminal is legal according to the identification of one or more CAGs supported by the third base station and the comparison result of the PLMN identification with the approved CAG list of the terminal, or according to the target cell
  • the comparison result of the supported CAG identification and the PLMN identification and the approved CAG list of the terminal determines whether the current handover of the terminal is legal, and if the current handover of the terminal is legal, a handover request is sent to the third base station.
  • the terminal determines that the current handover of the terminal is legal.
  • the core network controls the switching of the terminal by authenticating the terminal.
  • the base station sends the identification of one or more CAGs supported by the base station to the core network element through the NG interface establishment request (for example, NG SETUP REQEST); the core network element may return the NG interface establishment response ( NG SETUP RESPONSE).
  • the base station sends the identification of one or more CAGs supported by the base station to the core network element through radio interface configuration update information (for example, RAN CONFIGURATION UPDATE), and the core network element may return a radio interface configuration update confirmation message (for example, , RAN CONFIGURATION UPDATE).
  • the base station sends the CAG ID list supported by itself to the core network, which facilitates the core network to control the handover of the terminal.
  • the handover request is, for example, a Handover Request, which can add the approved CAG list of the terminal, and further can add the access mode identifier of the terminal.
  • the access mode identifier includes: an access mode identifier (CAG-only indication) indicating that only CAG can be accessed.
  • CAG-only indication an access mode identifier indicating that only CAG can be accessed.
  • a list of permitted CAGs of the terminal and an access mode identifier indicating that only CAGs can be accessed can be added to the Mobility Restriction List (Mobility Restriction List) cell.
  • Mobility Restriction List Mobility Restriction List
  • step S408 the third base station sends handover request confirmation information to the core network element, and correspondingly, the core network element receives the handover request confirmation information sent by the third base station.
  • the third base station determines, for example, that the terminal can only access CAG according to the access mode identifier, and compares the PLMN identifier with the list of CAG contracted by the terminal according to the identification of one or more CAGs supported by the third base station. To determine whether to allow terminal switching. In the case that one or more CAG identities and PLMN identities supported by the third base station overlap with the list of the terminal's contracted CAG, it is determined that the terminal is allowed to switch. Or, alternatively, the third base station determines whether to allow the terminal to switch according to the comparison result of the CAG identifier supported by the target cell and the PLMN identifier and the terminal's approved CAG list. The third base station can authenticate the terminal, thereby performing handover control on the terminal.
  • step S410 the core network element returns a handover instruction to the first base station according to the handover request confirmation information.
  • the first base station receives the handover instruction returned by the core network element according to the handover request confirmation information, so as to switch the terminal to the third base station. CAG supported by the base station.
  • the handover command is, for example, Handover Command, and the subsequent handover process can refer to the prior art.
  • the source base station (first base station) sends a handover request message to the core network
  • the core network can control the selection of the target base station (third base station) or target cell according to the measurement report of the terminal.
  • the terminal corresponding to CAG-only indication is not switched to a non-CAG cell, and the target base station or target cell that matches the Allowed CAG list of the terminal is selected.
  • the target base station can authenticate the terminal and determine whether to allow access. By adding the CAG identification, Allowed CAG list and CAG-only indication that the terminal measures to surrounding cells in the existing handover signaling, the process of the terminal handover between CAGs is realized.
  • the present disclosure also provides a base station, which is described below with reference to FIG. 5.
  • FIG. 5 is a structural diagram of some embodiments of the disclosed base station.
  • the base station 50 in this embodiment includes: a sending module 510, a receiving module 520, and a connecting module 530.
  • the base station 50 may serve as the first base station in the foregoing embodiment.
  • the sending module 510 is configured to send a broadcast message, and the broadcast message includes: one or more closed access group CAG identities and public land mobile network PLMN identities supported by the first base station.
  • the receiving module 520 is configured to receive a connection request sent by the terminal, where the connection request indicates that the first base station supports one or more CAGs subscribed by the terminal.
  • the terminal determines whether the first base station supports one or more CAGs subscribed by the terminal according to the comparison result of the identification of one or more CAGs supported by the first base station and the PLMN identification and the approved CAG list of the terminal.
  • the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the connection module 530 is configured to establish a radio resource control RRC connection with the terminal according to the connection request, receive the RRC establishment complete message sent by the terminal, and allow the terminal to access the terminal to select the CAG to access according to the RRC establishment complete message, where the RRC establishment complete message It carries the identification of the CAG and the PLMN that the terminal chooses to access.
  • the sending module 510 is further configured to send an initial user equipment message to the core network element.
  • the initial user equipment message includes: the CAG and PLMN identification that the terminal selects to access, and is used to verify the current access of the terminal. is it legal.
  • the receiving module 520 is also used to receive the downlink non-access layer transmission information sent by the core network element, and the connecting module 530 is also used to allow the terminal access terminal to select the CAG to access according to the downlink non-access layer transmission information. Access transmission information indicates that the terminal access is legal this time.
  • whether the terminal's current access is legal or not is determined based on the comparison result of the CAG ID and the PLMN ID that the terminal chooses to access with the approved CAG list of the terminal; wherein, the approved CAG list includes: one subscribed by the terminal Or multiple CAG identities and PLMN identities.
  • the receiving module 520 is further configured to receive a measurement report sent by the terminal.
  • the measurement report includes: the terminal measures the CAG identification, PLMN identification, and signal quality information corresponding to surrounding cells.
  • the sending module 510 is further configured to judge the handover threshold value according to the measurement report and determine that the target cell is the cell corresponding to the second base station. In the case of determining that the handover condition is met, send a handover request to the second base station.
  • the handover request includes: The approved CAG list of the terminal, the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the receiving module 520 is further configured to receive the handover request confirmation information returned by the second base station, and switch the terminal to the target cell according to the handover request confirmation information.
  • the handover request confirmation information indicates that the target cell supports the CAG subscribed by the terminal.
  • the handover request further includes: an access mode identifier of the terminal, and the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed.
  • the second base station determines that the terminal can only access CAG according to the access mode identifier, and determines whether the terminal is allowed to switch according to the comparison result of the identification of one or more CAGs supported by the second base station and the PLMN identifier and the approved CAG list of the terminal,
  • send a handover request confirmation message to the first base station or determine whether to allow terminal handover according to the comparison result of the CAG ID and PLMN ID supported by the target cell and the list of approved CAGs of the terminal.
  • the switch request confirmation message is sent to the first base station.
  • the sending module 510 is further configured to perform handover thresholds based on the terminal's measurement of the CAG identification corresponding to surrounding cells and the matching result of the PLMN identification with the terminal's approved CAG list, and the terminal's measurement of signal quality information corresponding to the surrounding cells. According to the judgment, if the handover condition is met, the cell corresponding to the second base station is selected as the target cell, and a handover request is sent to the second base station.
  • the approved CAG list of the terminal is obtained by the first base station through the initial context establishment request sent by the core network element, and the approved CAG list includes one or more CAG identities and PLMN identities subscribed by the terminal.
  • the receiving module 520 is further configured to receive a measurement report sent by the terminal.
  • the measurement report includes: the terminal measures the CAG identification, PLMN identification, and signal quality information corresponding to surrounding cells.
  • the sending module 510 is further configured to judge the handover threshold value according to the measurement report and determine the cell corresponding to the third base station as the target cell, and if it is judged that the handover threshold value is met, send handover demand information to the core network element .
  • the handover requirement information includes: the terminal's approved CAG list and the third base station's identity, and the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal .
  • the receiving module 520 is further configured to receive a handover instruction returned by the core network element and perform a handover process, where the handover instruction indicates that the target cell supports the terminal to sign CAG.
  • the core network element determines whether the current handover of the terminal is legal according to the identification of one or more CAGs supported by the third base station and the comparison result of the PLMN identification with the approved CAG list of the terminal, or according to the target cell
  • the identification of the supported CAG and the comparison result of the PLMN identification and the approved CAG list of the terminal determine whether the current handover of the terminal is legal. If the current handover of the terminal is legal, a handover request is sent to the third base station.
  • the handover request further includes: the access mode identifier of the terminal, the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed; the third base station determines that the terminal can only access according to the access mode identifier CAG, according to the identification of one or more CAGs supported by the third base station and the comparison result of the PLMN identification with the list of approved CAGs of the terminal, determine whether to allow terminal handover, and if terminal handover is allowed, send to the core network element Handover request confirmation information, or, according to the comparison result of the CAG ID supported by the target cell and the PLMN ID and the terminal’s approved CAG list, determine whether the terminal is allowed to handover, and if the terminal handover is allowed, send it to the core network element Switch request confirmation message.
  • the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed
  • the third base station determines that the terminal can only access according to the access mode identifier CAG, according to the identification of
  • the third base station sends the identification of one or more CAGs supported by the third base station to the core network element through the next-generation NG interface establishment request; or, the third base station sends the wireless interface configuration update information to the core network element.
  • the identification of one or more CAGs supported by the third base station is sent to the core network element.
  • the present disclosure also provides a terminal, which is described below with reference to FIG. 6.
  • Fig. 6 is a structural diagram of some embodiments of a terminal of the present disclosure. As shown in FIG. 6, the terminal 60 of this embodiment includes: a receiving module 610, a determining module 620, and a sending module 630.
  • the receiving module 610 is configured to receive a broadcast message sent by the first base station, and the broadcast message includes: the identity of one or more closed access group CAGs supported by the first base station and the public land mobile network PLMN identity.
  • the determining module 620 is configured to determine whether the first base station supports one or more CAGs subscribed by the terminal according to the broadcast message.
  • the determining module 620 is configured to determine whether the first base station supports one or more CAGs subscribed by the terminal according to the comparison result of the CAG identifier supported by the first base station and the PLMN identifier and the approved CAG list of the terminal;
  • the CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the sending module 630 is used to select one CAG from the CAG subscribed by the terminal and supported by the first base station when the first base station supports one or more CAGs subscribed by the terminal, and send a connection request to the first base station to establish a connection with the base station
  • the terminal sends an RRC establishment complete message to the first base station, where the RRC establishment complete message carries the CAG identification and PLMN identification that the terminal selects to access, and instructs the first base station to select the terminal to access the terminal.
  • CAG CAG.
  • the sending module 630 is further configured to send a measurement report to the first base station.
  • the measurement report includes: the terminal measures the CAG identification, PLMN identification, and signal quality information corresponding to surrounding cells, and is used for the first base station to switch the terminal. .
  • the present disclosure also provides a communication system, which is described below with reference to FIG. 7.
  • FIG. 7 is a structural diagram of some embodiments of the communication system of the present disclosure. As shown in FIG. 7, the system 7 of this embodiment includes: the base station 50 of any of the foregoing embodiments and the terminal 60 of any of the foregoing embodiments. The base station 50 may serve as the first base station.
  • the system 7 further includes: a core network element 72 for receiving an initial user equipment message sent by the first base station 50; determining whether the terminal 60 is currently accessing legally according to the initial user equipment message; When the secondary access is legal, the core network element sends downlink non-access stratum transmission information to the first base station 50, where the initial user equipment message includes the CAG and PLMN identifications that the terminal selects to access.
  • a core network element 72 for receiving an initial user equipment message sent by the first base station 50; determining whether the terminal 60 is currently accessing legally according to the initial user equipment message; When the secondary access is legal, the core network element sends downlink non-access stratum transmission information to the first base station 50, where the initial user equipment message includes the CAG and PLMN identifications that the terminal selects to access.
  • the core network element 72 is configured to determine whether the current access of the terminal 60 is legal according to the comparison result of the CAG identifier and the PLMN identifier that the terminal 60 selects to access with the approved CAG list of the terminal 60.
  • the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal 60.
  • the system 7 further includes: a second base station 74 for receiving a handover request sent by the first base station 50, and determining whether to allow the terminal 60 to handover according to the handover request; when the second base station 74 allows the terminal 60 to handover Next, return handover request confirmation information to the first base station 50, where the handover request includes the approved CAG list of the terminal, and the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the handover request further includes: an access mode identifier of the terminal 60
  • the access mode identifier includes: an access mode identifier indicating that only CAG can be accessed.
  • the second base station 74 is configured to determine that the terminal 60 can only access CAG according to the access mode identifier, and according to the comparison result of one or more CAG identifiers and PLMN identifiers supported by the second base station 74 and the list of permitted CAGs of the terminal 60, Determine whether to allow the terminal 60 to switch, or determine whether to allow the terminal 60 to switch according to the comparison result of the CAG identifier and the PLMN identifier supported by the target cell corresponding to the second base station and the approved CAG list of the terminal 60, and then determine whether the terminal 60 is allowed to switch. In the case of sending handover request confirmation information to the first base station 50.
  • the system 7 further includes: a third base station 76.
  • the core network element 72 is also used to receive the handover requirement information sent by the first base station 50, send a handover request to the third base station 76 according to the handover requirement information, and receive the handover request confirmation information sent by the third base station 76; confirm the information according to the handover request The handover instruction is returned to the first base station 50.
  • the core network element 72 is configured to determine whether the current handover of the terminal 60 is legal according to the comparison result of the identification of one or more CAGs supported by the third base station 76 and the PLMN identification and the approved CAG list of the terminal 60 , Or, according to the comparison result of the CAG ID supported by the target cell corresponding to the third base station and the PLMN ID and the terminal’s approved CAG list, it is determined whether the terminal handover is legal.
  • the third base station 76 sends a handover request; the approved CAG list includes: one or more CAG identities and PLMN identities subscribed by the terminal.
  • the third base station 76 is used to receive a handover request from the core network element 72.
  • the handover request includes: the approved CAG list of the terminal 60 and the access mode identifier of the terminal 60.
  • the access mode identifier includes: indicating that only Access to the CAG access mode identification; according to the access mode identification, it is determined that the terminal 60 can only access the CAG, according to the ratio of the identification of one or more CAGs supported by the third base station 76 and the PLMN identification to the list of signed CAGs of the terminal 60 For the result, it is determined whether the terminal 60 is allowed to switch.
  • the handover request confirmation message sent to the core network element 72, or according to the ratio of the CAG identification and PLMN identification supported by the target cell corresponding to the third base station 76 to the list of permitted CAGs of the terminal 60 For the result, it is determined whether the terminal 60 is allowed to switch, and if the terminal 60 is allowed to switch, the switch request confirmation message is sent to the core network element 72.
  • the third base station 76 is used to send the identification of one or more CAGs supported by the third base station 76 to the core network element 72 through the next-generation NG interface establishment request; or, the third base station 76 is used to pass The wireless interface configuration update information sends the identification of one or more CAGs supported by the third base station 76 to the core network element 72.
  • the communication system, the base station and the terminal in the embodiment of the present disclosure may be implemented by various computing devices or computer systems, which are described below with reference to FIG. 8 and FIG. 9.
  • FIG. 8 is a structural diagram of some embodiments of the communication system of the present disclosure.
  • the system 80 of this embodiment includes a memory 810 and a processor 820 coupled to the memory 810.
  • the processor 820 is configured to execute any of the implementations in the present disclosure based on instructions stored in the memory 810.
  • the communication method in the example is a structural diagram of some embodiments of the communication system of the present disclosure.
  • the memory 810 may include, for example, a system memory, a fixed non-volatile storage medium, and the like.
  • the system memory for example, stores an operating system, an application program, a boot loader (Boot Loader), a database, and other programs.
  • FIG. 9 is a structural diagram of other embodiments of the communication system of the present disclosure.
  • the system 90 of this embodiment includes a memory 910 and a processor 920, which are similar to the memory 810 and the processor 820, respectively. It may also include an input/output interface 930, a network interface 940, a storage interface 950, and so on. These interfaces 930, 940, 950, and the memory 910 and the processor 920 may be connected via a bus 960, for example.
  • the input and output interface 930 provides a connection interface for input and output devices such as a display, a mouse, a keyboard, and a touch screen.
  • the network interface 940 provides a connection interface for various networked devices, for example, it can be connected to a database server or a cloud storage server.
  • the storage interface 950 provides a connection interface for external storage devices such as SD cards and U disks.
  • the embodiments of the present disclosure can be provided as a method, a system, or a computer program product. Therefore, the present disclosure may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present disclosure may take the form of a computer program product implemented on one or more computer-usable non-transitory storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. .
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps configured to implement functions specified in a flow or multiple flows in the flowchart and/or a block or multiple blocks in the block diagram.

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Abstract

本公开涉及一种通信方法、系统以及基站、终端，涉及通信技术领域。本公开的方法包括：第一基站发送广播消息，广播消息包括：第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；第一基站接收终端发送的连接请求，连接请求表示第一基站支持终端签约的一个或多个CAG；第一基站根据连接请求，与终端建立无线资源控制RRC连接；第一基站接收终端发送的RRC建立完成消息，其中，RRC建立完成消息中携带终端选择接入的CAG的标识和PLMN标识；第一基站根据RRC建立完成消息允许终端接入终端选择接入的CAG。

Description

通信方法、系统以及基站、终端
相关申请的交叉引用
本申请是以CN申请号为201911042165.4，申请日为2019年10月30日的申请为基础，并主张其优先权，该CN申请的公开内容在此作为整体引入本申请中。
技术领域
本公开涉及通信技术领域，特别涉及一种通信方法、系统以及基站、终端。
背景技术
5G技术的研究目标是提供更高可靠性和更低时延的通信，以此满足不同行业不用用户的需求。例如针对一些公网覆盖内特定用户的需求可以设计专属于某些特定用户的非公用网络用于通信服务。其中非独立组网下的非公共网络可以满足网络覆盖内特定用户的需求，可以用闭合接入组(CAG，Closed Access Group)来描述这个概念，属于CAG小区的用户可以根据自己的注册信息选择使用公网接入网络或者使用CAG小区接入网络，运营商可以通过建设CAG小区为公网覆盖下的特殊建筑场景(例如大型商场，SOHO等)提供非公共网络接入。
目前在NR(New Radio，新空口)高层核心网技术研究中已经发觉了这一研究点，考虑未来5G网络会支持非独立组网的非公共网络功能，但是目前无线侧研究并未对CAG服务提供解决方案，为了在5G阶段支持非独立组网的非公共网络服务，需要设计相应的系统流程。
发明内容
本公开所要解决的一个技术问题是：提出一种非独立组网为终端提供CAG服务的方案。
根据本公开的一些实施例，提供的一种通信方法，包括：第一基站发送广播消息，广播消息包括：第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；第一基站接收终端发送的连接请求，连接请求表示第一基站支持终端签约的一个或多个CAG；第一基站根据连接请求，与终端建立无线资源控制RRC连接；第一基站接收终端发送的RRC建立完成消息，其中，RRC建立完成消息中携 带终端选择接入的CAG的标识和PLMN标识；第一基站根据RRC建立完成消息允许终端接入终端选择接入的CAG。
在一些实施例中，第一基站允许终端接入终端选择接入的CAG包括：第一基站向核心网网元发送初始用户设备消息，初始用户设备消息中包括：终端选择接入的CAG的标识和PLMN标识，用于验证终端本次接入是否合法；第一基站接收核心网网元发送的下行非接入层传输信息，根据下行非接入层传输信息允许终端接入终端选择接入的CAG，其中，下行非接入传输信息表示终端本次接入合法。
在一些实施例中，下行非接入层传输信息的移动性限制列表中增加终端的准许CAG列表以及终端的接入模式标识，准许CAG列表包括终端签约的一个或多个CAG的标识和PLMN标识，接入模式标识包括：表示只能接入CAG的接入模式标识。
在一些实施例中，终端本次接入是否合法是根据终端选择接入的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果确定的；其中，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，该方法还包括：第一基站接收终端发送的测量报告，测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息；第一基站根据测量报告进行切换门限值的判断并确定目标小区为第二基站对应的小区；第一基站在判断符合切换条件的情况下，则向第二基站发送切换请求，切换请求包括：终端的准许CAG列表，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识；第一基站接收第二基站返回的切换请求确认信息，根据切换请求确认信息将终端切换到目标小区中，切换请求确认信息表示第二基站支持终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，切换请求还包括：终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识，该方法还包括：第二基站根据接入模式标识确定终端只能接入CAG，根据第二基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向第一基站发送切换请求确认信息，或者，根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向第一基站发送切换请求确认信息。
在一些实施例中，第一基站根据测量报告进行切换门限值的判断并确定目标小区为第二基站对应的小区，在判断符合切换条件的情况下，则向第二基站发送切换请求 包括：第一基站根据终端测量周围小区对应的CAG的标识和PLMN标识与终端的准许CAG列表的匹配结果，以及终端测量周围小区对应的信号质量信息进行切换门限值的判断，在符合切换条件的情况下，选取第二基站对应的小区作为目标小区，并向第二基站发送切换请求；其中，终端的准许CAG列表是第一基站通过核心网网元发送的初始上下文建立请求获取的。
在一些实施例中，该方法还包括：第一基站接收终端发送的测量报告，测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息；第一基站根据测量报告进行切换门限值的判断并确定目标小区为第三基站对应的小区；第一基站在判断符合切换门限值的条件的情况下，向核心网网元发送切换需求信息，以通过核心网网元向第三基站发起切换请求，切换需求信息包括：目标小区的标识；第一基站接收核心网网元返回的切换指令，执行切换过程，其中，切换指令表示目标小区支持终端签约的CAG。
在一些实施例中，该方法还包括：核心网网元根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，或者，根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，在终端本次切换合法的情况下，向第三基站发送切换请求。
在一些实施例中，切换请求还包括：终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识；第三基站根据接入模式标识确定终端只能接入CAG，根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向核心网网元发送切换请求确认信息，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，。
在一些实施例中，第三基站是通过下一代NG接口建立请求将第三基站支持的一个或多个CAG的标识发送至核心网网元；或者，第三基站是通过无线接口配置更新信息将第三基站支持的一个或多个CAG的标识发送至核心网网元。
根据本公开的另一些实施例，提供的一种通信方法，包括：终端接收第一基站发送的广播消息，广播消息包括：第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；终端根据广播消息确定第一基站是否支持终端签约 的一个或多个CAG；在第一基站支持终端签约的一个或多个CAG的情况下，终端从终端签约的且第一基站支持的CAG中选择一个CAG；终端向第一基站发送连接请求，与基站建立无线资源控制RRC连接；终端向第一基站发送RRC建立完成消息，其中，RRC建立完成消息中携带终端选择接入的CAG的标识和PLMN标识，指示第一基站将终端接入终端选择接入的CAG。
在一些实施例中，终端根据广播消息确定第一基站是否支持终端签约的一个或多个CAG包括：终端根据第一基站支持的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定第一基站是否支持终端签约的一个或多个CAG；准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，该方法还包括：终端向第一基站发送测量报告，测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息，用于第一基站对终端进行切换。
根据本公开的又一些实施例，提供的一种基站，包括：发送模块，用于发送广播消息，广播消息包括：第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；接收模块，用于接收终端发送的连接请求，连接请求表示第一基站支持终端签约的一个或多个CAG；连接模块，用于根据连接请求，与终端建立无线资源控制RRC连接，接收终端发送的RRC建立完成消息，根据RRC建立完成消息允许终端接入终端选择接入的CAG，其中，RRC建立完成消息中携带终端选择接入的CAG的标识和PLMN标识。
根据本公开的再一些实施例，提供的一种终端，包括：接收模块，用于接收第一基站发送的广播消息，广播消息包括：第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；确定模块，用于根据广播消息确定第一基站是否支持终端签约的一个或多个CAG；发送模块，用于在第一基站支持终端签约的一个或多个CAG的情况下，从终端签约的且第一基站支持的CAG中选择一个CAG，向第一基站发送连接请求，与基站建立无线资源控制RRC连接，向第一基站发送RRC建立完成消息，其中，RRC建立完成消息中携带终端选择接入的CAG的标识和PLMN标识，指示第一基站将终端接入终端选择接入的CAG。
根据本公开的又一些实施例，提供的一种通信系统，包括：前述任意实施例的基站，以及前述任意实施例的终端。
在一些实施例中，该基站为第一基站，该系统还包括：核心网网元，用于接收第 一基站发送的初始用户设备消息，根据初始用户设备消息确定终端本次接入是否合法；在终端本次接入合法的情况下，核心网网元向第一基站发送下行非接入层传输信息，其中，初始用户设备消息中包括：终端选择接入的CAG的标识和PLMN标识。
在一些实施例中，初始用户设备消息还包括：核心网网元用于根据终端选择接入的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次接入是否合法的；其中，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，该系统还包括：第二基站，用于接收第一基站发送的切换请求，根据切换请求，确定是否允许终端切换；在第二基站允许终端切换的情况下，向第一基站返回切换请求确认信息其中，切换请求包括终端的准许CAG列表，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，切换请求还包括：终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识；第二基站用于根据接入模式标识确定终端只能接入CAG，根据第二基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换。
在一些实施例中，核心网网元还用于接收第一基站发送的切换需求信息，根据切换需求信息向第三基站发送切换请求，并接收第三基站发送的切换请求确认信息；根据切换请求确认信息向第一基站返回切换指令，。
在一些实施例中，核心网网元用于根据第三基站支持的一个或CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，在终端本次切换合法的情况下，向第三基站发送切换请求；准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，该系统还包括：第三基站，用于接收核心网网元的切换请求，其中，切换请求包括终端的准许CAG列表和终端的接入模式标识，接入模式标识包括表示只能接入CAG的接入模式标识；根据接入模式标识确定终端只能接入CAG，根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向核心网网元发送的切换请求确认信息。
在一些实施例中，第三基站用于通过下一代NG接口建立请求将第三基站支持的一个或多个CAG的标识发送至核心网网元；或者，第三基站用于通过无线接口配置 更新信息将第三基站支持的一个或多个CAG的标识发送至核心网网元。
根据本公开的再一些实施例，提供的一种通信系统，包括：处理器；以及耦接至处理器的存储器，用于存储指令，指令被处理器执行时，使处理器执行如前述任意实施例的通信方法。
根据本公开的又一些实施例，提供的一种非瞬时性计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现前述任意实施例的通信方法。
根据本公开的再一些实施例，提供的一种基站，包括：处理器；以及耦接至处理器的存储器，用于存储指令，指令被处理器执行时，使处理器执行如前述任意实施例的通信方法中由第一基站、第二基站和第三基站执行的方法。
根据本公开的又一些实施例，提供的一种非瞬时性计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现前述任意实施例的通信方法中由第一基站、第二基站和第三基站执行的方法。
根据本公开的再一些实施例，提供的一种终端，包括：处理器；以及耦接至处理器的存储器，用于存储指令，指令被处理器执行时，使处理器执行如前述任意实施例的通信方法中由终端执行的方法。
根据本公开的又一些实施例，提供的一种非瞬时性计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现前述任意实施例的通信方法中由终端执行的方法。
本公开中第一基站通过广播消息将本基站支持的一个或多个CAG的标识进行广播，终端根据自身签约的一个或多个CAG和监听到的广播消息，选取第一基站进行初始接入，从而接入相应的CAG。本公开的方案提供了一种非独立组网下终端接入非公共网络的方案，实现利用非公共网络为终端提供服务。
通过以下参照附图对本公开的示例性实施例的详细描述，本公开的其它特征及其优点将会变得清楚。
附图说明
此处所说明的附图用来提供对本公开的进一步理解，构成本申请的一部分，本公开的示意性实施例及其说明被配置为解释本公开，并不构成对本公开的不当限定。
图1示出本公开的一些实施例的通信方法的流程示意图。
图2示出本公开的另一些实施例的通信方法的流程示意图。
图3示出本公开的又一些实施例的通信方法的流程示意图。
图4示出本公开的再一些实施例的通信方法的流程示意图。
图5示出本公开的一些实施例的基站的结构示意图。
图6示出本公开的一些实施例的终端的结构示意图。
图7示出本公开的一些实施例的通信系统的结构示意图。
图8示出本公开的另一些实施例的通信系统的结构示意图。
图9示出本公开的又一些实施例的通信系统的结构示意图。
具体实施方式
下面将结合本公开实施例中的附图，对本公开实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本公开一部分实施例，而不是全部的实施例。以下对至少一个示例性实施例的描述实际上仅仅是说明性的，决不作为对本公开及其应用或使用的任何限制。基于本公开中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本公开保护的范围。
针对目前标准中没有提供5G非独立组网场景中如何为终端提供非公共网络服务的具体方案的问题，提出本方案。
本公开中在终端侧添加新的标识。例如，添加非独立组网下非公共网络的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识(CAG-only indication)，配置了该标识的终端只能通过CAG接入网络。又例如，添加终端的准许CAG列表(Allowed CAG list)，用于存储该终端进行注册并通过授权的网络对应的一个或多个CAG的标识(CAG ID)。上述标识可以在终端签约注册时确定，核心网和终端可以各保留一份。在终端接入和切换过程中，基站可以通过核心网获取上述标识，后续将进行具体描述。
在网络侧添加新的标识，例如，添加基站支持的一个或多个CAG的标识(CAG ID)，通过一个CAG ID和PLMN(Public Land Mobile Network，公共陆地移动网络)标识可以唯一确定一个CAG网络
下面结合图1进行描述本公开通信方法的一些实施例。
图1为本公开通信方法一些实施例的流程图。如图1所示，该实施例的方法包括：步骤S102～S112。
在步骤S102中，第一基站发送广播消息，相应的，终端监听第一基站发送的广 播消息。
广播消息包括：第一基站支持的一个或多个CAG的标识，第一基站支持的CAG的标识可以有一个或多个，如果有多个可以形成CAG ID列表，可以在SIB(系统消息块)，例如，SIB1中包含第一基站支持的CAG的标识。广播还可以包括现有标准中已经确定的各种信息，例如，PLMN(Public Land Mobile Network，公共陆地移动网络)标识等。
在步骤S104中，终端根据接收到的广播消息，确定第一基站是否支持终端签约的一个或多个CAG；
在一些实施例中，终端根据自身配置的接入模式标识，判断接入网络的模式，例如接入模式标识为表示只能接入CAG的接入模式标识(CAG-only indication)，则表示终端只能通过CAG接入网络，如果接入模式标识为空或者表示只能接入PLMN的接入模式标识，则终端只能通过PLMN接入网络。终端接收到广播消息后解析广播消息获取第一基站支持的一个或多个CAG的标识。根据第一基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG列表(Allowed CAG list)的比对结果，确定第一基站是否支持终端签约的一个或多个CAG。准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在步骤S106中，在第一基站支持终端签约的一个或多个CAG且终端选择第一基站的情况下，终端向第一基站发送连接请求，相应的，第一基站接收终端发送的连接请求。
支持终端签约的CAG的基站除了第一基站可能还会有其他一个或多个基站，上述过程可以作为对现有小区选择或小区重选的流程的改进。即在终端当前处于小区选择场景的情况下，采用小区选择流程中的规则选取第一基站或其他基站，或者，在终端当前处于小区重选场景的情况下，采用小区重选流程中的规则选取第一基站或其他基站。
针对现有小区选择和小区重选的信令流程做出以下改进，未改进的部分可以参考现有标准。终端根据自身是否配置了CAG-only indication来确定接入网络的模式，针对配置了CAG-only indication的终端，终端周期性的监听广播信息中的CAG标识(CAG ID)，通过自身的Allowed CAG list判断自己是否属于广播信息中CAG ID对应小区的CAG签约终端，如果属于，则根据小区选择或小区重选的规则选取广播信息中CAG ID对应的小区进行接入。
终端向第一基站发送连接请求例如为RRC Setup Request(无线资源控制建立请求)，该信息可以参考现有技术。
第一基站可以根据连接请求，允许终端接入，具体如下。
在步骤S108中，第一基站根据连接请求，与终端建立RRC连接。
在步骤S110中，终端向第一基站发送RRC建立完成消息，相应的，第一基站接收终端发送的RRC建立完成消息。RRC建立完成消息中可以携带终端选择接入的CAG的标识和PLMN标识。
在步骤S112中，第一基站根据RRC建立完成消息允许终端接入终端选择接入的CAG。
在一些实施例中，如图2所示，基站与终端建立RRC连接，允许将终端接入终端选择接入的CAG的过程包括：步骤S202～S210。
在步骤S202中，第一基站向终端发送无线资源控制建立消息，例如RRC Setup(无线资源控制建立)，该步骤可以参考现有技术，例如基站可以根据负载情况等信息判断是否允许终端接入，允许的情况下，执行步骤S204。
在步骤S204中，终端向第一基站发送无线资源控制建立完成消息，例如，RRC Setup Complete(无线资源控制建立完成)。该步骤可以参考现有技术。
无线资源控制建立完成消息中可以包括：终端选择接入的CAG的标识和PLMN标识。在第一基站支持多个CAG的情况下，终端会从第一基站支持多个CAG中选择与自己的Allowed CAG list匹配的一个CAG进行接入。。
在步骤S206中，第一基站向核心网网元发送初始用户设备消息。
初始用户设备消息例如为INITIAL UE MESSAGE，初始用户设备消息中包括：终端选择接入的CAG的标识和PLMN标识。该步骤在现有信令中增加终端选择接入的CAG的标识。
在步骤S208中，核心网网元根据初始用户设备消息确定终端本次接入是否合法。
核心网网元例如为AMF(Access and Mobility Management Function，接入移动管理功能)。在一些实施例中，核心网网元是根据终端选择接入的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次接入是否合法的。在终端选择接入的CAG的标识和PLMN标识与终端的准许CAG列表中的任一个CAG的标识和对应的PLMN标识相同的情况下，确定终端本次接入合法，否则，不合法。核心网网元通过上述过程对终端进行鉴权。
在步骤S210中，在终端本次接入合法的情况下，核心网网元向第一基站发送下行非接入层传输信息。相应的，第一基站接收核心网网元发送的下行非接入层传输信息。下行非接入层传输信息表示终端本次接入合法，第一基站可以根据下行非接入层传输信息将终端接入终端选择接入的CAG。
下行非接入层传输信息例如为DOWNLINK NAS TRANSPORT，DOWNLINK NAS TRANSPORT的Mobility Restriction List(移动性限制列表)中增加终端的准许CAG列表(Allowed CAG list)以及终端的接入模式标识，准许CAG列表包括终端签约的一个或多个CAG的标识和PLMN标识，接入模式标识包括：表示只能接入CAG的接入模式标识(CAG-only indication)。
该消息可以参考现有技术。上述实施例在终端初始接入的过程中，INITIAL UE MESSAGE中增加终端选择接入的CAG的标识，增加核心网网元对终端的鉴权过程。
上述实施例的方法中第一基站通过广播消息将本基站支持的一个或多个CAG的标识和PLMN标识进行广播，终端根据自身签约的一个或多个CAG和监听到的广播消息，选取第一基站进行初始接入，从而接入相应的CAG。上述实施例的方案提供了一种非独立组网下终端接入非公共网络的方案，通过对现有信令流程的改进实现利用非公共网络为终端提供服务。
本公开还提供一种实现终端在CAG中切换的过程，在非独立组网场景中，切换过程分为基于Xn接口的切换和基于NG(Next Generation，下一代)的切换，下面分别结合图3和图4进行描述。
图3为本公开通信方法另一些实施例的流程图。如图3所示，该实施例的方法包括：步骤S302～S308。
在步骤S302中，终端向第一基站发送测量报告，相应的，第一基站接收终端发送的测量报告。
测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息，还可以参考现有技术包括其他信息。在测量报告中添加终端测量周围小区对应的CAG的标识。
在步骤S304中，第一基站根据测量报告进行切换门限值的判断，如果符合切换条件，则选取第二基站对应的小区为目标小区并向第二基站发送切换请求。第一基站进行切换门限值的判断，确定第二基站对应的小区作为目标小区可以参考现有技术，在此不再赘述。
前述实施例中，核心网网元向第一基站发送下行非接入层传输信息，之后的信令流程还包括：核心网网元向第一基站发送初始上下文建立请求，例如，INITIAL CONTEXT SETUP REQUEST，该消息中添加终端的准许CAG列表。核心网网元处可以获取终端签约的Allowed CAG list，通过上述消息通知基站。
在一些实施例中，第一基站根据终端测量周围小区对应的CAG的标识和PLMN标识、与终端的准许CAG列表的匹配结果，以及终端测量周围小区对应的信号质量信息进行切换门限值的判断，在符合切换条件的情况下，选取一个小区即第二基站对应的小区作为目标小区，并向第二基站发送切换请求。第二基站支持的一个或多个CAG的标识和PLMN标识需要与终端签约的一个或多个CAG的标识和PLMN标识存在交集，选取第二基站需要参考的其他信息例如信号质量信息可以根据现有技术确定。
切换请求例如为Handover Request，可以添加终端的准许CAG列表，进一步还可以添加终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识(CAG-only Indication)。可以在Mobility Restriction List(移动性限制列表)信元中添加终端的准许CAG列表和表示只能接入CAG的接入模式标识。
在步骤S306中，第二基站根据切换请求，确定是否允许终端切换。
第二基站例如根据接入模式标识确定终端只能接入CAG，根据第二基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换。在第二基站支持的一个或多个CAG的标识和PLMN标识与终端的签约CAG的列表有交集的情况下，确定允许终端切换。或者，第二基站根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换。第二基站可以对终端进行鉴权，从而对终端进行切换控制。
在步骤S308中，在第二基站允许终端切换的情况下，第二基站向第一基站返回切换请求确认信息，相应的，第一基站接收第二基站返回的切换请求确认信息，将终端切换到目标小区中。
第二基站例如向第一基站返回Handover Request Ack(切换请求确认)，后续切换流程可以参考现有技术。
上述基于Xn接口的切换实施例中，源基站(第一基站)可以根据终端的测量报告对目标基站(第二基站)或目标小区的选择做出控制，例如不将CAG-only indication对应的终端切换到非CAG小区下等。目标基站可以对终端进行鉴权，确定是否允许 接入。通过在现有切换信令中增加终端测量周围小区对应的CAG的标识，Allowed CAG list以及CAG-only indication，实现终端在CAG之间进行切换的过程。
下面结合图4描述基于NG的切换过程。
图4为本公开通信方法又一些实施例的流程图。如图4所示，该实施例的方法包括：步骤S402～S410。
在步骤S402中，终端向第一基站发送测量报告，相应的，第一基站接收终端发送的测量报告。
测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息，还可以参考现有技术包括其他信息。在测量报告中添加终端测量周围小区对应的CAG的标识。由于终端并不能获知之后的切换过程是基于Xn接口还是NG接口，因此，测量报告信息与前述实施例保持一致。
在步骤S404中，第一基站根据测量报告进行切换门限值的判断，如果符合切换条件，则选取第三基站的小区作为目标小区并向核心网网元发送切换需求信息。
核心网网元例如为AMF。切换需求信息例如为Handover Required，包括：第三基站的标识。
在步骤S406中，核心网网元根据切换需求信息向第三基站发送切换请求。
在一些实施例中，核心网网元根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，或者，根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，在终端本次切换合法的情况下，向第三基站发送切换请求。在第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG列表存在交集的情况下，或者，目标小区支持支持的CAG的标识和PLMN标识与终端的准许CAG列表存在交集的情况下，终端确定终端本次切换合法。核心网通过对终端的鉴权，对终端的切换进行控制。
在一些实施例中，基站通过NG接口建立请求(例如，NG SETUP REQEST)将基站支持的一个或多个CAG的标识发送至核心网网元；核心网网元可以向基站返回NG接口建立响应(NG SETUP RESPONSE)。或者，基站通过无线接口配置更新信息(例如，RAN CONFIGURATION UPDATE)将基站支持的一个或多个CAG的标识发送至核心网网元，核心网网元可以向基站返回无线接口配置更新确认消息(例如，RAN CONFIGURATION UPDATE)。基站将自身支持的CAG ID list发送至核心网，便 于核心网对终端的切换进行控制。
切换请求例如为Handover Request，可以添加终端的准许CAG列表，进一步还可以添加终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识(CAG-only Indication)。可以在Mobility Restriction List(移动性限制列表)信元中添加终端的准许CAG列表和表示只能接入CAG的接入模式标识。
在步骤S408中，第三基站向核心网网元发送切换请求确认信息，相应的，核心网网元接收第三基站发送的切换请求确认信息。
在一些实施例中，第三基站例如根据接入模式标识确定终端只能接入CAG，根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的签约CAG的列表的比对结果，确定是否允许终端切换。在第三基站支持的一个或多个CAG的标识和PLMN标识与终端的签约CAG的列表有交集的情况下，确定允许终端切换。或者，或者，第三基站根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换。第三基站可以对终端进行鉴权，从而对终端进行切换控制。
在步骤S410中，核心网网元根据切换请求确认信息向第一基站返回切换指令，相应的，第一基站接收核心网网元根据切换请求确认信息返回的切换指令，以便将终端切换到第三基站支持的CAG中。
切换指令例如为Handover Command，后续切换过程可以参考现有技术。
上述基于NG接口的切换实施例中，源基站(第一基站)向核心网发送切换需求消息，核心网可以根据终端的测量报告对目标基站(第三基站)或目标小区的选择做出控制，例如不将CAG-only indication对应的终端切换到非CAG小区下，选取与终端的Allowed CAG list相匹配的目标基站或目标小区等。目标基站可以对终端进行鉴权，确定是否允许接入。通过在现有切换信令中增加终端测量周围小区对应的CAG的标识，Allowed CAG list以及CAG-only indication，实现终端在CAG之间进行切换的过程。
本公开还提供一种基站，下面结合图5进行描述。
图5为本公开基站的一些实施例的结构图。如图5所示，该实施例的基站50包括：发送模块510，接收模块520，连接模块530。基站50可以作为前述实施例第一基站。
发送模块510，用于发送广播消息，广播消息包括：第一基站支持的一个或多个 闭合接入组CAG的标识和公共陆地移动网络PLMN标识。
接收模块520，用于接收终端发送的连接请求，其中，连接请求表示第一基站支持终端签约的一个或多个CAG。
在一些实施例中，终端是根据第一基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定第一基站是否支持终端签约的一个或多个CAG的；准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
连接模块530，用于根据连接请求，与终端建立无线资源控制RRC连接，接收终端发送的RRC建立完成消息，根据RRC建立完成消息允许终端接入终端选择接入的CAG，其中，RRC建立完成消息中携带终端选择接入的CAG的标识和PLMN标识。
在一些实施例中，发送模块510还用于向核心网网元发送初始用户设备消息，初始用户设备消息中包括：终端选择接入的CAG的标识和PLMN标识，用于验证终端本次接入是否合法。接收模块520还用于收核心网网元发送的下行非接入层传输信息，连接模块530还用于根据下行非接入层传输信息允许终端接入终端选择接入的CAG，其中，下行非接入传输信息表示终端本次接入合法。
在一些实施例中，终端本次接入是否合法是根据终端选择接入的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果确定的；其中，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，接收模块520还用于接收终端发送的测量报告，测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息。发送模块510还用于根据测量报告进行切换门限值的判断并确定目标小区为第二基站对应的小区，在判断符合切换条件的情况下，则向第二基站发送切换请求，切换请求包括：终端的准许CAG列表，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。接收模块520还用于接收第二基站返回的切换请求确认信息，根据切换请求确认信息将终端切换到目标小区中，切换请求确认信息表示目标小区支持终端签约的CAG。
在一些实施例中，切换请求还包括：终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识。第二基站根据接入模式标识确定终端只能接入CAG，根据第二基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向第一基站发送切换请求确认信息，或者，根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况 下，向第一基站发送切换请求确认信息。
在一些实施例中，发送模块510还用于根据终端测量周围小区对应的CAG的标识和PLMN标识与终端的准许CAG列表的匹配结果，以及终端测量周围小区对应的信号质量信息进行切换门限值的判断，在符合切换条件的情况下，选取第二基站对应的小区作为目标小区，并向第二基站发送切换请求。终端的准许CAG列表是第一基站通过核心网网元发送的初始上下文建立请求获取的，准许CAG列表包括终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，接收模块520还用于接收终端发送的测量报告，测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息。发送模块510还用于根据测量报告进行切换门限值的判断并确定第三基站对应的小区为目标小区，在判断符合切换门限值的条件的情况下，向核心网网元发送切换需求信息，以通过核心网网元向第三基站发起切换请求，，切换需求信息包括：终端的准许CAG列表以及第三基站的标识，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。接收模块520还用于接收核心网网元返回的切换指令，执行切换过程，其中，切换指令表示目标小区支持终端签约CAG。
在一些实施例中，核心网网元根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，或者，根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法在终端本次切换合法的情况下，向第三基站发送切换请求。
在一些实施例中，切换请求还包括：终端的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识；第三基站根据接入模式标识确定终端只能接入CAG，根据第三基站支持的一个或多个CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向核心网网元发送切换请求确认信息，或者，根据目标小区支持的CAG的标识和PLMN标识与终端的准许CAG的列表的比对结果，确定是否允许终端切换，在允许终端切换的情况下，向核心网网元发送切换请求确认信息。
在一些实施例中，第三基站是通过下一代NG接口建立请求将第三基站支持的一个或多个CAG的标识发送至核心网网元；或者，第三基站是通过无线接口配置更新信息将第三基站支持的一个或多个CAG的标识发送至核心网网元。
本公开还提供一种终端，下面结合图6进行描述。
图6为本公开终端的一些实施例的结构图。如图6所示，该实施例的终端60包括：接收模块610，确定模块620，发送模块630。
接收模块610，用于接收第一基站发送的广播消息，广播消息包括：第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识。
确定模块620，用于根据广播消息确定第一基站是否支持终端签约的一个或多个CAG。
在一些实施例中，确定模块620用于根据第一基站支持的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定第一基站是否支持终端签约的一个或多个CAG；准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
发送模块630，用于在第一基站支持终端签约的一个或多个CAG的情况下，从终端签约的且第一基站支持的CAG中选择一个CAG，向第一基站发送连接请求，与基站建立无线资源控制RRC连接，端向第一基站发送RRC建立完成消息，其中，RRC建立完成消息中携带终端选择接入的CAG的标识和PLMN标识，指示第一基站将终端接入终端选择接入的CAG。
在一些实施例中，发送模块630还用于向第一基站发送测量报告，测量报告包括：终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息，用于第一基站对终端进行切换。
本公开还提供一种通信系统，下面结合图7进行描述。
图7为本公开通信系统的一些实施例的结构图。如图7所示，该实施例的系统7包括：前述任意实施例的基站50和前述任意实施例的终端60。基站50可以作为第一基站。
在一些实施例中，系统7还包括：核心网网元72，用于接收第一基站50发送的初始用户设备消息；根据初始用户设备消息确定终端60本次接入是否合法；在终端60本次接入合法的情况下，核心网网元向第一基站50发送下行非接入层传输信息，其中，初始用户设备消息中包括：终端选择接入的CAG的标识和PLMN标识。
在一些实施例中，核心网网元72用于根据终端60选择接入的CAG的标识和PLMN标识与终端60的准许CAG列表的比对结果，确定终端60本次接入是否合法的。准许CAG列表包括：终端60签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，系统7还包括：第二基站74，用于接收第一基站50发送的切换请求，根据切换请求，确定是否允许终端60切换；在第二基站74允许终端60切 换的情况下，向第一基站50返回切换请求确认信息，其中，切换请求包括终端的准许CAG列表，准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，切换请求还包括：终端60的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识。第二基站74用于根据接入模式标识确定终端60只能接入CAG，根据第二基站74支持的一个或多个CAG的标识和PLMN标识与终端60的准许CAG的列表的比对结果，确定是否允许终端60切换,或者，根据第二基站对应的目标小区支持的CAG的标识和PLMN标识与终端60的准许CAG的列表的比对结果，确定是否允许终端60切换，在允许终端60切换的情况下，向第一基站50发送切换请求确认信息。
在一些实施例中，系统7还包括：第三基站76。核心网网元72还用于接收第一基站50发送的切换需求信息，根据切换需求信息向第三基站76发送切换请求，并接收第三基站76发送的切换请求确认信息；根据切换请求确认信息向第一基站50返回切换指令。
在一些实施例中，核心网网元72用于根据第三基站76支持的一个或多个CAG的标识和PLMN标识与终端60的准许CAG列表的比对结果，确定终端60本次切换是否合法，或者，根据第三基站对应的目标小区支持的CAG的标识和PLMN标识与终端的准许CAG列表的比对结果，确定终端本次切换是否合法，在终端本次切换合法的情况下，向第三基站76发送切换请求；准许CAG列表包括：终端签约的一个或多个CAG标识和PLMN标识。
在一些实施例中，第三基站76用于接收核心网网元72的切换请求，切换请求包括：终端60的准许CAG列表和终端60的接入模式标识，接入模式标识包括：表示只能接入CAG的接入模式标识；根据接入模式标识确定终端60只能接入CAG，根据第三基站76支持的一个或多个CAG的标识和PLMN标识与终端60的签约CAG的列表的比对结果，确定是否允许终端60切换。在允许终端切换的情况下，向核心网网元72发送的切换请求确认信息，或者，根据第三基站76对应的目标小区支持的CAG的标识和PLMN标识与终端60的准许CAG的列表的比对结果，确定是否允许终端60切换，在允许终端60切换的情况下，向核心网网元72发送切换请求确认信息。
在一些实施例中，第三基站76用于通过下一代NG接口建立请求将第三基站76支持的一个或多个CAG的标识发送至核心网网元72；或者，第三基站76用于通过无 线接口配置更新信息将第三基站76支持的一个或多个CAG的标识发送至核心网网元72。
本公开的实施例中的通信系统，以及基站和终端可各由各种计算设备或计算机系统来实现，下面结合图8以及图9进行描述。
图8为本公开通信系统的一些实施例的结构图。如图8所示，该实施例的系统80包括：存储器810以及耦接至该存储器810的处理器820，处理器820被配置为基于存储在存储器810中的指令，执行本公开中任意一些实施例中的通信方法。
其中，存储器810例如可以包括系统存储器、固定非易失性存储介质等。系统存储器例如存储有操作系统、应用程序、引导装载程序(Boot Loader)、数据库以及其他程序等。
图9为本公开通信系统的另一些实施例的结构图。如图9所示，该实施例的系统90包括：存储器910以及处理器920，分别与存储器810以及处理器820类似。还可以包括输入输出接口930、网络接口940、存储接口950等。这些接口930，940，950以及存储器910和处理器920之间例如可以通过总线960连接。其中，输入输出接口930为显示器、鼠标、键盘、触摸屏等输入输出设备提供连接接口。网络接口940为各种联网设备提供连接接口，例如可以连接到数据库服务器或者云端存储服务器等。存储接口950为SD卡、U盘等外置存储设备提供连接接口。
基站和终端由各种计算设备或计算机系统来实现时具体结构与图7和图8相同或相似，不再赘述。
本领域内的技术人员应当明白，本公开的实施例可提供为方法、系统、或计算机程序产品。因此，本公开可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本公开可采用在一个或多个其中包含有计算机可用程序代码的计算机可用非瞬时性存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本公开是参照根据本公开实施例的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解为可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生被配置为实现在流程图一个流程或多个流程和/或方框图一 个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供被配置为实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
以上所述仅为本公开的较佳实施例，并不用以限制本公开，凡在本公开的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本公开的保护范围之内。

Claims (31)

  1. 一种通信方法，包括：
    第一基站发送广播消息，所述广播消息包括：所述第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；
    所述第一基站接收终端发送的连接请求，其中，所述连接请求表示所述第一基站支持所述终端签约的一个或多个CAG；
    所述第一基站根据所述连接请求，与所述终端建立无线资源控制RRC连接；
    所述第一基站接收所述终端发送的RRC建立完成消息，其中，所述RRC建立完成消息中携带所述终端选择接入的CAG的标识和PLMN标识；
    所述第一基站根据所述RRC建立完成消息允许所述终端接入所述终端选择接入的CAG。
  2. 根据权利要求1所述的通信方法，其中，所述第一基站允许所述终端接入所述终端选择接入的CAG包括：
    所述第一基站向核心网网元发送初始用户设备消息，所述初始用户设备消息中包括所述终端选择接入的CAG的标识和PLMN标识，用于验证所述终端本次接入是否合法；
    所述第一基站接收所述核心网网元发送的下行非接入层传输信息，根据所述下行非接入层传输信息允许所述终端接入所述终端选择接入的CAG，其中，所述下行非接入层传输信息表示所述终端本次接入合法。
  3. 根据权利要求2所述的通信方法，其中，
    所述下行非接入层传输信息的移动性限制列表中增加所述终端的准许CAG列表以及所述终端的接入模式标识，其中，所述准许CAG列表包括所述终端签约的一个或多个CAG的标识和PLMN标识，所述接入模式标识包括表示只能接入CAG的接入模式标识。
  4. 根据权利要求3所述的通信方法，其中，
    所述终端本次接入是否合法是根据所述终端选择接入的CAG的标识和PLMN标 识与所述终端的准许CAG列表的比对结果确定的。
  5. 根据权利要求1所述的通信方法，还包括：
    所述第一基站接收所述终端发送的测量报告，所述测量报告包括：所述终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息；
    所述第一基站根据所述测量报告进行切换门限值的判断，并确定目标小区为第二基站对应的小区；
    所述第一基站在判断符合切换条件的情况下，向第二基站发送切换请求，其中，所述切换请求包括所述终端的准许CAG列表，所述准许CAG列表包括所述终端签约的一个或多个CAG标识和PLMN标识；
    所述第一基站接收所述第二基站返回的切换请求确认信息，根据所述切换请求确认信息将所述终端切换到所述目标小区中，其中，所述切换请求确认信息表示所述目标小区支持所述终端签约的CAG标识和PLMN标识。
  6. 根据权利要求5所述的通信方法，其中，所述切换请求还包括所述终端的接入模式标识，所述接入模式标识包括表示只能接入CAG的接入模式标识，所述方法还包括：
    所述第二基站根据所述接入模式标识确定所述终端只能接入CAG，根据所述第二基站支持的一个或多个CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述第一基站发送所述切换请求确认信息，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述第一基站发送所述切换请求确认信息。
  7. 根据权利要求5所述的通信方法，其中，所述第一基站根据所述测量报告进行切换门限值的判断，并确定目标小区为第二基站对应的小区，在判断符合切换条件的情况下，向第二基站发送切换请求包括：
    所述第一基站根据所述终端测量周围小区对应的CAG的标识和PLMN标识与所述终端的准许CAG列表的匹配结果，以及所述终端测量周围小区对应的信号质量信息进行切换门限值的判断，在符合切换的条件的情况下，选取第二基站对应的小区作 为目标小区，并向所述第二基站发送切换请求；
    其中，所述终端的准许CAG列表是所述第一基站通过核心网网元发送的初始上下文建立请求获取的。
  8. 根据权利要求1所述的通信方法，还包括：
    所述第一基站接收所述终端发送的测量报告，所述测量报告包括：所述终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息；
    所述第一基站根据所述测量报告进行切换门限值的判断并确定目标小区为第三基站对应的小区；
    所述第一基站在判断符合切换门限值的条件的情况下，向核心网网元发送切换需求信息，以通过所述核心网网元向所述第三基站发起切换请求，所述切换需求信息包括：目标小区的标识；
    所述第一基站接收所述核心网网元返回的切换指令，执行切换过程，其中，所述切换指令表示所述目标小区支持所述终端签约的CAG。
  9. 根据权利要求8所述的通信方法，还包括：
    所述核心网网元根据所述第三基站支持的一个或多个CAG的标识和PLMN标识与所述终端的准许CAG列表的比对结果，确定所述终端本次切换是否合法，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG列表的比对结果，确定所述终端本次切换是否合法，在所述终端本次切换合法的情况下，向所述第三基站发送切换请求，其中，所述准许CAG列表包括所述终端签约的一个或多个CAG标识和PLMN标识。
  10. 根据权利要求8所述的通信方法，其中，所述切换请求包括移动性限制列表，移动性限制列表包括所述终端的准许CAG列表和所述终端的接入模式标识，所述准许CAG列表包括所述终端签约的一个或多个CAG标识和PLMN标识，所述接入模式标识包括表示只能接入CAG的接入模式标识；
    所述第三基站根据所述接入模式标识确定所述终端只能接入CAG，根据所述第三基站支持的一个或多个CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述核心 网网元发送所述切换请求确认信息，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述核心网网元发送所述切换请求确认信息。
  11. 根据权利要求8所述的通信方法，其中，
    所述第三基站是通过下一代NG接口建立请求将所述第三基站支持的一个或多个CAG的标识发送至所述核心网网元；
    或者，所述第三基站是通过无线接口配置更新信息将所述第三基站支持的一个或多个CAG的标识发送至所述核心网网元。
  12. 一种通信方法，包括：
    终端接收第一基站发送的广播消息，所述广播消息包括：所述第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；
    所述终端根据所述广播消息确定所述第一基站是否支持所述终端签约的一个或多个CAG；
    在所述第一基站支持所述终端签约的一个或多个CAG的情况下，所述终端从所述终端签约的且所述第一基站支持的CAG中选择一个CAG；
    所述终端向所述第一基站发送连接请求，与所述基站建立无线资源控制RRC连接；
    所述终端向所述第一基站发送RRC建立完成消息，其中，所述RRC建立完成消息中携带所述终端选择接入的CAG的标识和PLMN标识，指示所述第一基站将所述终端接入所述终端选择接入的CAG。
  13. 根据权利要求12所述的通信方法，其中，所述终端根据所述广播消息确定所述第一基站是否支持所述终端签约的一个或多个CAG包括：
    所述终端根据所述第一基站支持的CAG的标识和PLMN标识与所述终端的准许CAG列表的比对结果，确定所述第一基站是否支持所述终端签约的一个或多个CAG；
    其中，所述准许CAG列表包括：所述终端签约的一个或多个CAG标识和PLMN标识。
  14. 根据权利要求12所述的通信方法，还包括：
    所述终端向所述第一基站发送测量报告，所述测量报告包括：所述终端测量周围小区对应的CAG的标识、PLMN标识和信号质量信息，用于所述第一基站对所述终端进行切换。
  15. 一种基站，其中，所述基站为第一基站，包括：
    发送模块，用于发送广播消息，所述广播消息包括：所述第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；
    接收模块，用于接收所述终端发送的连接请求，其中，所述连接请求表示所述第一基站支持所述终端签约的一个或多个CAG；
    连接模块，用于根据所述连接请求，与所述终端建立无线资源控制RRC连接，接收所述终端发送的RRC建立完成消息，根据所述RRC建立完成消息允许所述终端接入所述终端选择接入的CAG，其中，所述RRC建立完成消息中携带所述终端选择接入的CAG的标识和PLMN标识。
  16. 一种终端，包括：
    接收模块，用于接收第一基站发送的广播消息，所述广播消息包括：所述第一基站支持的一个或多个闭合接入组CAG的标识和公共陆地移动网络PLMN标识；
    确定模块，用于根据所述广播消息确定所述第一基站是否支持所述终端签约的一个或多个CAG；
    发送模块，用于在所述第一基站支持所述终端签约的一个或多个CAG的情况下，从所述终端签约的且所述第一基站支持的CAG中选择一个CAG，向所述第一基站发送连接请求，与所述基站建立无线资源控制RRC连接，向所述第一基站发送RRC建立完成消息，其中，所述RRC建立完成消息中携带所述终端选择接入的CAG的标识和PLMN标识，指示所述第一基站将所述终端接入所述终端选择接入的CAG。
  17. 一种通信系统，包括：权利要求15所述的基站，以及权利要求16所述的终端。
  18. 根据权利要求17所述的通信系统，其中，所述基站为第一基站，所述系统还 包括：
    核心网网元，用于接收所述第一基站发送的初始用户设备消息，根据所述初始用户设备消息确定所述终端本次接入是否合法；在所述终端本次接入合法的情况下，所述核心网网元向所述第一基站发送下行非接入层传输信息，其中，所述初始用户设备消息中包括所述终端选择接入的CAG的标识和PLMN标识。
  19. 根据权利要求18所述的通信系统，其中，
    所述核心网网元用于根据所述终端选择接入的CAG的标识和PLMN标识与所述终端的准许CAG列表的比对结果，确定所述终端本次接入是否合法的；
    其中，所述准许CAG列表包括：所述终端签约的一个或多个CAG标识和PLMN标识。
  20. 根据权利要求18所述的通信系统，还包括：
    第二基站，用于接收所述第一基站发送的切换请求，根据所述切换请求，确定是否允许所述终端切换；在所述第二基站允许所述终端切换的情况下，向所述第一基站返回切换请求确认信息其中，所述切换请求包括所述终端的准许CAG列表，所述准许CAG列表包括：所述终端签约的一个或多个CAG标识和PLMN标识。
  21. 根据权利要求20所述的通信系统，其中，所述切换请求还包括所述终端的接入模式标识，所述接入模式标识包括表示只能接入CAG的接入模式标识；
    所述第二基站用于根据所述接入模式标识确定所述终端只能接入CAG，根据所述第二基站支持的一个或多个CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述第一基站发送所述切换请求确认信息。
  22. 根据权利要求18所述的通信系统，其中，
    所述核心网网元还用于接收所述第一基站发送的切换需求信息，根据所述切换需求信息向第三基站发送切换请求，并接收所述第三基站发送的切换请求确认信息；根 据所述切换请求确认信息向所述第一基站返回切换指令。
  23. 根据权利要求22所述的通信系统，其中，
    所述核心网网元用于根据所述第三基站支持的一个或多个CAG的标识和PLMN标识与所述终端的准许CAG列表的比对结果，确定所述终端本次切换是否合法，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG列表的比对结果，确定所述终端本次切换是否合法，在所述终端本次切换合法的情况下，向所述第三基站发送切换请求。
  24. 根据权利要求22所述的通信系统，还包括：
    第三基站，用于接收所述核心网网元的切换请求，其中，所述切换请求包括所述终端的准许CAG列表和所述终端的接入模式标识，所述接入模式标识包括表示只能接入CAG的接入模式标识；根据所述接入模式标识确定所述终端只能接入CAG，根据所述第三基站支持的一个或多个CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述核心网网元发送的切换请求确认信息，或者，根据所述目标小区支持的CAG的标识和PLMN标识与所述终端的准许CAG的列表的比对结果，确定是否允许所述终端切换，在允许所述终端切换的情况下，向所述核心网网元发送所述切换请求确认信息。
  25. 根据权利要求24所述的通信系统，其中，
    所述第三基站用于通过下一代NG接口建立请求将所述第三基站支持的一个或多个CAG的标识发送至所述核心网网元；
    或者，所述第三基站用于通过无线接口配置更新信息将所述第三基站支持的一个或多个CAG的标识发送至所述核心网网元。
  26. 一种通信系统，包括：
    处理器；以及
    耦接至所述处理器的存储器，用于存储指令，所述指令被所述处理器执行时，使所述处理器执行如权利要求1-14任一项所述的通信方法。
  27. 一种非瞬时性计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现权利要求1-14任一项所述方法的步骤。
  28. 一种基站，包括：
    处理器；以及
    耦接至所述处理器的存储器，用于存储指令，所述指令被所述处理器执行时，使所述处理器执行如权利要求1-3、5-8、10-11任一项所述的通信方法。
  29. 一种非瞬时性计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现权利要求1-3、5-8、10-11任一项所述方法的步骤。
  30. 一种终端，包括：
    处理器；以及
    耦接至所述处理器的存储器，用于存储指令，所述指令被所述处理器执行时，使所述处理器执行如权利要求12-14任一项所述的通信方法。
  31. 一种非瞬时性计算机可读存储介质，其上存储有计算机程序，其中，该程序被处理器执行时实现权利要求12-14任一项所述方法的步骤。
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