WO2021134726A1 - 通信方法及装置 - Google Patents

通信方法及装置 Download PDF

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Publication number
WO2021134726A1
WO2021134726A1 PCT/CN2019/130985 CN2019130985W WO2021134726A1 WO 2021134726 A1 WO2021134726 A1 WO 2021134726A1 CN 2019130985 W CN2019130985 W CN 2019130985W WO 2021134726 A1 WO2021134726 A1 WO 2021134726A1
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WIPO (PCT)
Prior art keywords
plmn
network slice
terminal
information
access
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PCT/CN2019/130985
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English (en)
French (fr)
Inventor
孙飞
罗海燕
戴明增
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to CN201980103295.6A priority Critical patent/CN114902724A/zh
Priority to EP19958110.9A priority patent/EP4075863A4/en
Priority to PCT/CN2019/130985 priority patent/WO2021134726A1/zh
Publication of WO2021134726A1 publication Critical patent/WO2021134726A1/zh
Priority to US17/854,879 priority patent/US20220338300A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/30—Connection release
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/18—Selecting a network or a communication service
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/02—Communication route or path selection, e.g. power-based or shortest path routing
    • H04W40/04—Communication route or path selection, e.g. power-based or shortest path routing based on wireless node resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices
    • H04W88/085—Access point devices with remote components

Definitions

  • This application relates to the field of communication technology, and in particular to a communication method and device.
  • PLMN public land mobile network
  • PSTN public switched telephone network
  • the terminal will perform PLMN selection after powering on to select a suitable PLMN for communication.
  • the terminal only selects the PLMN based on the prior information of the PLMN and the signal strength of the cell.
  • the existing PLMN selection mechanism may lead to the same Uneven distribution of resources among network slices.
  • the embodiments of the present application provide a communication method and device for realizing resource balance.
  • a communication method including: a DU obtains resource occupation information of each network slice under at least two PLMNs supported by a cell of the DU, and sends the resource occupation information to the CU. Among them, each network slice under at least two PLMNs share resources.
  • the DU when the access network equipment is in a form where the DU and the CU are separated, the DU can send the resource occupation information of each network slice under each PLMN in the cell to the CU, so that the CU can use the resource occupation information , To achieve resource balance.
  • the method further includes: the DU receives the request information from the terminal, and sends the request information to the CU.
  • the request information includes the identity of the first PLMN and the identity of the first network slice, and the request information is used by the terminal to request access to the first network slice under the first PLMN.
  • the DU can send the request information sent by the terminal to the CU, so that the CU can obtain the PLMN and network slice information requested by the terminal.
  • the method further includes: the DU receives release information from the CU, and sends the release information to the terminal.
  • the release information is used to instruct the terminal to release the RRC connection with the CU.
  • the terminal in the case that the CU does not allow the terminal to access the first network slice of the first PLMN, the terminal can be instructed to release the RRC connection through the DU, so that the terminal can subsequently request the network slice again as soon as possible.
  • the release information includes a release reason
  • the release reason includes: insufficient resources of the first network slice under the first PLMN.
  • the resource occupation information is used by the CU to determine whether to allow the terminal to access the first network slice under the first PLMN.
  • the CU can determine whether to allow the terminal to access the first network slice under the first PLMN according to the resource occupation information, so that access control of the terminal can be performed based on the resource occupation information to achieve resource balance.
  • a communication device including: a processing unit and a communication unit; the processing unit is configured to obtain resource occupation information of each network slice under at least two PLMNs supported by a cell of the communication device, and at least two Each network slice under the PLMN shares resources; the communication unit is used to send resource occupation information to the CU.
  • the communication unit is also used to receive request information from the terminal and send the request information to the CU; where the request information includes the identity of the first PLMN and the identity of the first network slice, and the request information is used for The terminal requests to access the first network slice under the first PLMN.
  • the communication unit is further configured to receive release information from the CU and send release information to the terminal; where the release information is used to instruct the terminal to release the RRC connection with the CU.
  • the release information includes a release reason
  • the release reason includes: insufficient resources of the first network slice under the first PLMN.
  • the resource occupation information is used by the CU to determine whether to allow the terminal to access the first network slice under the first PLMN.
  • a communication method including: a CU receives resource occupation information of each network slice under at least two PLMNs supported by a cell of the DU from the DU, and uses the resource occupation information. Among them, each network slice under at least two PLMNs share resources.
  • the CU can receive resource occupation information from the DU, and use the resource occupation information to achieve resource balance.
  • the method further includes: the CU receives request information from the DU, the request information includes the identity of the first PLMN and the identity of the first network slice, and the request information is used by the terminal to request access to the first PLMN.
  • the first network slice the CU uses the resource occupation information, including: when the CU determines that the terminal is not allowed to access the first network slice under the first PLMN according to the resource occupation information, and the terminal establishes an RRC connection with the CU, the CU sends to the DU Release information, which is used to instruct the terminal to release the RRC connection with the CU.
  • the terminal in the case that the CU does not allow the terminal to access the first network slice of the first PLMN, the terminal can be instructed to release the RRC connection through the DU, so that the terminal can subsequently request the network slice again as soon as possible.
  • the CU when the CU determines that the terminal is not allowed to access the first network slice under the first PLMN according to the resource occupation information, and the terminal establishes an RRC connection with the CU, the CU sends release information to the DU, including : When the CU determines, according to the resource occupation information, that the resource occupation rate of the first network slice under the first PLMN is greater than or equal to the threshold, and the terminal establishes an RRC connection with the CU, the CU sends release information to the DU.
  • the CU when the resource occupancy rate of the first network slice under the first PLMN is greater than or equal to the threshold, the CU sends release information to the DU, which can prevent the terminal from accessing the network slice with a high resource occupancy rate. Achieve resource balance.
  • the CU when the CU determines that the terminal is not allowed to access the first network slice under the first PLMN according to the resource occupation information, and the terminal establishes an RRC connection with the CU, the CU sends release information to the DU, including : When the CU determines according to the resource occupation information that the first network slice under the first PLMN is not the first network slice with the lowest resource occupancy rate among the first network slices under the at least two PLMNs, and the terminal establishes an RRC connection with the CU , CU sends release information to DU.
  • the CU sends release information to the DU when the first network slice under the first PLMN is not the first network slice with the lowest resource occupancy rate among the first network slices under the at least two PLMNs, It can prevent the terminal from accessing network slices with a high resource occupancy rate, and achieve resource balance.
  • the CU when the CU determines that the terminal is not allowed to access the first network slice under the first PLMN according to the resource occupation information, and the terminal establishes an RRC connection with the CU, the CU sends release information to the DU, including : When the CU determines that the resource of the first network slice under the first PLMN is overloaded according to the resource occupation information, and the terminal establishes an RRC connection with the CU, the CU sends release information to the DU. In this possible implementation manner, the CU sends release information to the DU when the resources of the first network slice under the first PLMN are overloaded, which can prevent the terminal from accessing the resource overloaded network slice and achieve resource balance.
  • the release information includes a release reason
  • the release reason includes: insufficient resources of the first network slice under the first PLMN.
  • the method further includes: the CU sends a reason for denying terminal access to the AMF in the first PLMN, and the reason includes: insufficient resources of the first network slice under the first PLMN.
  • This possible implementation manner may enable the AMF in the first PLMN to determine further actions based on the reason for releasing the RRC connection, for example, to perform overload control on an overloaded network slice or a network slice that takes up more resources.
  • a communication device including: a processing unit and a communication unit; the communication unit is configured to receive from the DU the resource occupation information of each network slice under at least two PLMNs supported by the cell of the DU, at least two Each network slice under the PLMN shares resources; the processing unit is used to use resource occupation information.
  • the communication unit is further configured to receive request information from the DU.
  • the request information includes the identity of the first PLMN and the identity of the first network slice.
  • the request information is used by the terminal to request access to the first PLMN.
  • the first network slice a processing unit, specifically configured to communicate through communication when the communication device determines that the terminal is not allowed to access the first network slice under the first PLMN according to the resource occupation information, and the terminal establishes an RRC connection with the communication device
  • the unit sends release information to the DU, and the release information is used to instruct the terminal to release the RRC connection with the communication device.
  • the processing unit is specifically configured to: the communication device determines, according to the resource occupation information, that the resource occupation rate of the first network slice under the first PLMN is greater than or equal to the threshold, and the terminal establishes with the communication device In the case of RRC connection, a release message is sent to the DU through the communication unit.
  • the processing unit is specifically configured to: determine, according to the resource occupancy information, that the first network slice under the first PLMN is not the resource occupancy rate in the first network slice under at least two PLMNs In the case of the lowest first network slice and the terminal establishes an RRC connection with the communication device, the communication unit sends release information to the DU.
  • the processing unit is specifically configured to: when the communication device determines that the resource of the first network slice under the first PLMN is overloaded according to the resource occupation information, and the terminal establishes an RRC connection with the communication device , Send release information to the DU through the communication unit.
  • the release information includes a release reason
  • the release reason includes: insufficient resources of the first network slice under the first PLMN.
  • the communication unit is further configured to send a reason why the terminal is denied access to the AMF in the first PLMN, and the reason includes: insufficient resources of the first network slice under the first PLMN.
  • a communication method including: an access network device obtains resource occupation information of each network slice under at least two PLMNs of a cell of the access network device, and each of the at least two PLMNs Network slicing shares resources; the access network device sends the resource occupation information to the terminal.
  • the access network device can send the resource occupation information of each network slice under at least two PLMNs of the cell of the access network device to the terminal, and the terminal can use the resource occupation information to achieve resource balance.
  • the resource occupation information is carried in system information.
  • the terminal does not need to establish an RRC connection with the access network device to obtain the resource occupation information, so that the requested network slice can be determined earlier based on the resource occupation information.
  • a communication device including: a processing unit and a communication unit; the processing unit is configured to obtain resource occupation information of each network slice under at least two PLMNs of a cell of the communication device, and The respective network slices under at least two PLMNs share resources; the communication unit is configured to send the resource occupation information to the terminal.
  • the resource occupation information is carried in system information.
  • a communication method including: a terminal receives resource occupation information from an access network device, where the resource occupation information is resources of each network slice under at least two PLMNs of a cell of the access network device Occupation information, each network slice under the at least two PLMNs share resources; the terminal uses the resource occupation information.
  • the terminal can receive and use resource occupation information from the access network device. For example, it can request network slicing based on the resource occupation information to achieve resource balance.
  • the use of the resource occupation information by the terminal includes: the terminal sends request information to the access network device with reference to the resource occupation information, and the request information includes the information of the first PLMN An identifier and an identifier of the first network slice, and the request information is used to request access to the first network slice under the first PLMN.
  • the terminal can select network slices under the PLMN according to the resource occupation information, thereby avoiding selecting network slices with high resource occupation (or resource occupation) or resource overload, and achieving resource balance.
  • the terminal sending request information to the access network device with reference to the resource occupation information includes: the terminal selects the first PLMN with reference to the resource occupation information; the terminal Sending request information to the access network device.
  • the terminal refers to the resource occupation information to select the first PLMN, including: the terminal determines a list of PLMNs, one PLMN in the list corresponds to one cell, and one PLMN corresponds to The signal strength of the cell is greater than or equal to the first threshold; the terminal makes judgments according to the signal strength of the cells corresponding to the PLMN in the list in descending order, until a PLMN that meets the first condition is determined, of which one The PLMN meeting the first condition includes: the PLMN can provide the first network slice for the terminal, and the resources occupied by the first network slice under the PLMN meet the second condition; The PLMN that meets the first condition is determined to be the first PLMN.
  • the terminal can select a PLMN without a priori information based on the resource occupancy information, thereby avoiding selecting network slices with high resource occupancy (or resource occupancy) or resource overload, and achieving resource balance.
  • that the terminal selects the first PLMN with reference to the resource occupation information includes: in the case that there is a PLMN that meets the first condition among the PLMNs maintained by the terminal, the terminal determines The PLMN that meets the first condition is the first PLMN; otherwise, the terminal determines the list of PLMNs, and judges in the order of the signal strength of the cells corresponding to the PLMNs in the list, until A PLMN that meets the first condition is determined, and a PLMN that meets the first condition is determined as the first PLMN.
  • One PLMN in the list corresponds to one cell, and the signal strength of the cell corresponding to one PLMN is greater than or Equal to the first threshold; where a PLMN meeting the first condition includes: the PLMN can provide the first network slice for the terminal, and the resources occupied by the first network slice under the PLMN meet the first Two conditions.
  • the terminal can select a PLMN with a priori information based on the resource occupation information, thereby avoiding selecting network slices with a high resource occupation rate (or resource occupation) or resource overload, and achieving resource balance.
  • the resource occupied by the first network slice under a PLMN satisfies a second condition, including: the resource occupancy rate of the first network slice under the PLMN is less than or equal to the second condition. Threshold; or, the amount of resources occupied by the first network slice under the PLMN is less than or equal to a third threshold; or, the resources of the first network slice under the PLMN are not overloaded.
  • a communication device including: a communication unit and a processing unit; the communication unit is configured to receive resource occupation information from an access network device, where the resource occupation information is a cell of the access network device Resource occupation information of each network slice under at least two PLMNs, and each network slice under the at least two PLMNs share resources; the processing unit is configured to use the resource occupation information.
  • the processing unit is specifically configured to: send request information to the access network device with reference to the resource occupation information, where the request information includes the identity of the first PLMN and the first network slice The request information is used to request access to the first network slice under the first PLMN.
  • the processing unit is specifically configured to: select the first PLMN with reference to the resource occupation information; and send request information to the access network device through the communication unit.
  • the processing unit is specifically configured to: determine a list of PLMNs, one PLMN in the list corresponds to one cell, and the signal strength of the cell corresponding to one PLMN is greater than or equal to a first threshold; according to The signal strengths of the cells corresponding to the PLMNs in the list are judged in descending order, until a PLMN that satisfies the first condition is determined, where a PLMN that satisfies the first condition includes: the PLMN can be the The communication device provides the first network slice, and the resource occupied by the first network slice under the PLMN meets a second condition; and determines the PLMN that meets the first condition as the first PLMN.
  • the processing unit is specifically configured to: in the case that there is a PLMN that meets the first condition among the PLMNs maintained by the communication device, determine that the PLMN that meets the first condition is the The first PLMN; otherwise, determine the list of PLMNs, and determine the signal strengths of the cells corresponding to the PLMNs in the list in descending order, until a PLMN that meets the first condition is determined and will meet
  • the PLMN under the first condition is determined to be the first PLMN, one PLMN in the list corresponds to one cell, and the signal strength of the cell corresponding to one PLMN is greater than or equal to a first threshold; wherein, one PLMN satisfies the first
  • the condition includes: the PLMN can provide the first network slice for the communication device, and the resource occupied by the first network slice under the PLMN meets a second condition.
  • the resource occupied by the first network slice under a PLMN satisfies a second condition, including: the resource occupancy rate of the first network slice under the PLMN is less than or equal to the second condition. Threshold; or, the amount of resources occupied by the first network slice under the PLMN is less than or equal to a third threshold; or, the resources of the first network slice under the PLMN are not overloaded.
  • a communication method including: a terminal sends a first message to the access network device in a cell of the access network device, where the first message is a message in a random access process, and the first message A message can indicate a first PLMN and/or a first network slice, where the first PLMN is the PLMN that the terminal wants to access, and the first network slice is the network slice that the terminal wants to access; the terminal A first response is received from the access network device, where the first response includes information about whether to allow the terminal to access the first PLMN and/or the first network slice.
  • the terminal can indicate the PLMN information and network slice information that it wants to access through the message in the random access process, so that the access network device can obtain this information earlier, and use some subsequent information.
  • the exchange of messages performs terminal access control, thereby reducing signaling overhead.
  • the information about whether to allow the terminal to access the first PLMN and/or the first network slice is determined by the access network device according to the at least two PLMNs of the cell
  • the resource occupancy information of each network slice below is determined, and each network slice under the at least two PLMNs shares resources.
  • whether to allow the terminal to access the first network slice under the first PLMN can be determined according to the resource occupation information, so that access control of the terminal can be performed based on the resource occupation information to achieve resource balance.
  • the first message is message 1 or message 3 or message A.
  • the first message is message 1 or message A
  • the message 1 and the message A contain a preamble
  • the preamble set to which the preamble belongs is the same as the first PLMN And/or corresponding to the first network slice.
  • This possible implementation provides a way for the access network device to learn the first PLMN and/or the first network slice that the terminal requests to access.
  • the first message is message 3, and the message 3 includes a preset identifier, and the preset identifier corresponds to the first PLMN and/or the first network slice.
  • This possible implementation provides a way for the access network device to learn the first PLMN and/or the first network slice that the terminal requests to access.
  • the first message includes the identity of the first PLMN and/or the identity of the first network slice.
  • This possible implementation provides a way for the access network device to learn the first PLMN and/or the first network slice that the terminal requests to access.
  • the first message is message A, and the identification of the first PLMN and/or the identification of the first network slice is carried in a data payload.
  • the terminal sending the first message to the access network device in the cell of the access network device includes: the terminal uses the first PRACH resource to send the first message to the access network device.
  • the first PRACH resource corresponds to the first network slice under the first PLMN.
  • the method further includes: the terminal receives system information broadcast by the access network device from the access network device, and the system information includes information under the multiple PLMNs PRACH resources corresponding to each network slice; the terminal determines the PRACH resources corresponding to the network slices under the multiple PLMNs according to the system information.
  • This possible implementation manner can enable the terminal to obtain the correspondence between network slices and PRACH resources in multiple PLMNs.
  • the terminal sending the first message to the access network device in the cell of the access network device includes: the terminal uses the second PRACH resource to send the first message to the access network device.
  • the second PRACH resource corresponds to the first network slice.
  • the method further includes: the terminal receives system information broadcast by the access network device from the access network device, and the system information includes each of the communication systems in the communication system.
  • This possible implementation can enable the terminal to obtain the correspondence between the network slice and the PRACH resource.
  • the terminal sending the first message to the access network device in the cell of the access network device includes: the terminal uses the third PRACH resource to send the first message to the access network device.
  • the third PRACH resource corresponds to the first PLMN.
  • the method further includes: the terminal receives system information broadcast by the access network device from the access network device, and the system information includes information corresponding to the multiple PLMNs PRACH resources; the terminal determines PRACH resources corresponding to the multiple PLMNs according to the system information.
  • This possible implementation manner can enable the terminal to acquire multiple correspondences between PLMNs and PRACH resources.
  • the first response when the terminal is not allowed to access the first network slice under the first PLMN, the first response includes a rejection reason, and the rejection reason includes: The resources of the first PLMN and/or the first network slice are insufficient.
  • This possible implementation can enable the terminal to learn the reason for being denied access to the first PLMN and/or the first network slice.
  • a communication device including: a processing unit and a communication unit; the processing unit is configured to send a first message to the access network device through the communication unit in a cell of the access network device,
  • the first message is a message in a random access process, the first message can indicate a first PLMN and/or a first network slice, the first PLMN is a PLMN that the communication device wants to access, and the The first network slice is the network slice that the communication device wants to access;
  • the processing unit is further configured to receive a first response from the access network device through the communication unit, and the first response includes whether to allow The communication device accesses the information of the first PLMN and/or the first network slice.
  • the information about whether to allow the communication device to access the first PLMN and/or the first network slice is determined by the access network device according to at least two of the cells.
  • the resource occupation information of each network slice under the PLMN is determined, and each network slice under the at least two PLMNs shares resources.
  • the first message is message 1 or message 3 or message A.
  • the first message is message 1 or message A
  • the message 1 and the message A contain a preamble
  • the preamble set to which the preamble belongs is the same as the first PLMN And/or corresponding to the first network slice.
  • the first message is message 3, and the message 3 includes a preset identifier, and the preset identifier corresponds to the first PLMN and/or the first network slice.
  • the first message includes the identity of the first PLMN and/or the identity of the first network slice.
  • the first message is message A, and the identification of the first PLMN and/or the identification of the first network slice is carried in a data payload.
  • the processing unit is specifically configured to use the first PRACH resource to send the first message to the access network device through the communication unit, and the first PRACH resource and the Corresponding to the first network slice under the first PLMN.
  • the processing unit is further configured to receive the system information broadcast by the access network device from the access network device through the communication unit, and the system information includes the multiple PRACH resources corresponding to each network slice under each PLMN; the processing unit is further configured to determine PRACH resources corresponding to the network slices under the multiple PLMNs according to the system information.
  • the processing unit is specifically configured to use a second PRACH resource to send the first message to the access network device through the communication unit, and the second PRACH resource is connected to the The first network slice corresponds.
  • the processing unit is further configured to receive system information broadcast by the access network device from the access network device through the communication unit, and the system information includes the communication The PRACH resource corresponding to each network slice in the system; the processing unit is further configured to determine the PRACH resource corresponding to the network slice in the communication system according to the system information.
  • the processing unit is specifically configured to use a third PRACH resource to send the first message to the access network device through the communication unit, and the third PRACH resource is connected to the Corresponding to the first PLMN.
  • the processing unit is further configured to receive the system information broadcast by the access network device from the access network device through the communication unit, and the system information includes the multiple PRACH resources corresponding to each PLMN; the processing unit is further configured to determine PRACH resources corresponding to the multiple PLMNs according to the system information.
  • the first response includes a reason for rejection, and the reason for rejection includes : Insufficient resources of the first PLMN and/or the first network slice.
  • a communication method including: an access network device receives a first message from a terminal in a cell of the access network device, the first message being a message in a random access process, and The first message can indicate a first PLMN and/or a first network slice, where the first PLMN is the PLMN that the terminal wants to access, and the first network slice is the network slice that the terminal wants to access; The access network device sends a first response to the terminal, where the first response includes information about whether to allow the terminal to access the first PLMN and/or the first network slice.
  • the terminal can indicate the information of the PLMN that it wants to access and the information of the network slice through a message in the random access process, so that the access network device can obtain this information earlier, and use subsequent Some interactive messages perform terminal access control, thereby reducing signaling overhead.
  • the access network device sending a first response to the terminal includes: the access network device according to the resource occupation information of each network slice under at least two PLMNs of the cell Send a first response to the terminal, and each network slice under the at least two PLMNs share resources.
  • the access network device can determine whether to allow the terminal to access the first network slice under the first PLMN according to the resource occupation information, so that the terminal can be accessed based on the resource occupation information to achieve resource balance.
  • the first message is message 1 or message 3 or message A.
  • the first message is message 1 or message A
  • the message 1 and the message A contain a preamble
  • the preamble set to which the preamble belongs is the same as the first PLMN And/or corresponding to the first network slice.
  • This possible implementation provides a way for the access network device to learn the first PLMN and/or the first network slice that the terminal requests to access.
  • the first message is message 3, and the message 3 includes a preset identifier, and the preset identifier corresponds to the first PLMN and/or the first network slice.
  • This possible implementation provides a way for the access network device to learn the first PLMN and/or the first network slice that the terminal requests to access.
  • the first message includes the identity of the first PLMN and/or the identity of the first network slice.
  • This possible implementation provides a way for the access network device to learn the first PLMN and/or the first network slice that the terminal requests to access.
  • the first message is message A, and the identification of the first PLMN and/or the identification of the first network slice is carried in a data payload.
  • that the access network device receives the first message from the terminal in the cell of the access network device includes: the access network device receives the first message from the terminal on the first PRACH resource In the first message, the first PRACH resource corresponds to the first network slice under the first PLMN.
  • This possible implementation provides a way for the access network device to learn the first network slice in the first PLMN that the terminal requests to access.
  • the method further includes: the access network device broadcasting system information, and the system information includes PRACH resources corresponding to each network slice under the multiple PLMNs.
  • the system information includes PRACH resources corresponding to each network slice under the multiple PLMNs.
  • that the access network device receives the first message from the terminal in the cell of the access network device includes: the access network device receives the first message from the terminal on the second PRACH resource In the first message, the second PRACH resource corresponds to the first network slice.
  • This possible implementation provides a way for the access network device to learn the first network slice that the terminal requests to access.
  • the method further includes: the access network device broadcasting system information, and the system information includes PRACH resources corresponding to each network slice in the communication system.
  • the system information includes PRACH resources corresponding to each network slice in the communication system. This possible implementation can enable the terminal to obtain the correspondence between the network slice and the PRACH resource.
  • that the access network device receives the first message from the terminal in the cell of the access network device includes: the access network device receives the first message from the terminal on the third PRACH resource In the first message, the third PRACH resource corresponds to the first PLMN.
  • This possible implementation provides a way for the access network device to learn the first PLMN that the terminal requests to access.
  • the method further includes: the access network device broadcasting system information, and the system information includes PRACH resources corresponding to the multiple PLMNs.
  • the method further includes: the access network device broadcasting system information, and the system information includes PRACH resources corresponding to the multiple PLMNs.
  • the first response when the terminal is not allowed to access the first PLMN and/or the first network slice, the first response includes a rejection reason, and the rejection reason includes : Insufficient resources of the first PLMN and/or the first network slice.
  • This possible implementation can enable the terminal to learn the reason for being denied access to the first PLMN and/or the first network slice.
  • a communication device including: a communication unit and a processing unit; the processing unit is configured to receive a first message from a terminal in a cell of the communication device through the communication unit, and the first The message is a message in the random access process, the first message can indicate the first PLMN and/or the first network slice, the first PLMN is the PLMN that the terminal wants to access, and the first network slice is The network slice that the terminal wants to access; the processing unit is further configured to send a first response to the terminal through the communication unit, and the first response includes whether to allow the terminal to access the first Information of the PLMN and/or the first network slice.
  • the processing unit is specifically configured to: send a first response to the terminal through the communication unit according to the resource occupation information of each network slice under at least two PLMNs of the cell , The respective network slices under the at least two PLMNs share resources.
  • the first message is message 1 or message 3 or message A.
  • the first message is message 1 or message A
  • the message 1 and the message A contain a preamble
  • the preamble set to which the preamble belongs is the same as the first PLMN And/or corresponding to the first network slice.
  • the first message is message 3, and the message 3 includes a preset identifier, and the preset identifier corresponds to the first PLMN and/or the first network slice.
  • the first message includes the identity of the first PLMN and/or the identity of the first network slice.
  • the first message is message A, and the identification of the first PLMN and/or the identification of the first network slice is carried in a data payload.
  • the processing unit is specifically configured to receive the first message from the terminal on a first PRACH resource through the communication unit, and the first PRACH resource is connected to the first PRACH resource. Corresponding to the first network slice under the PLMN.
  • the processing unit is further configured to broadcast system information through the communication unit, and the system information includes PRACH resources corresponding to each network slice under the multiple PLMNs.
  • the processing unit is specifically configured to receive the first message from the terminal on a second PRACH resource through the communication unit, and the second PRACH resource is connected to the first PRACH resource.
  • Network slicing correspondence is specifically configured to receive the first message from the terminal on a second PRACH resource through the communication unit, and the second PRACH resource is connected to the first PRACH resource.
  • the processing unit is further configured to broadcast system information through the communication unit, and the system information includes PRACH resources corresponding to each network slice in the communication system.
  • the processing unit is specifically configured to receive the first message from the terminal on a third PRACH resource through the communication unit, and the third PRACH resource and the first PLMN corresponds.
  • the processing unit is further configured to broadcast system information through the communication unit, and the system information includes PRACH resources corresponding to the multiple PLMNs.
  • the first response when the terminal is not allowed to access the first PLMN and/or the first network slice, the first response includes a rejection reason, and the rejection reason includes : Insufficient resources of the first PLMN and/or the first network slice.
  • a communication device in a thirteenth aspect, includes: a memory and a processor; optionally, at least one communication interface and a communication bus; the memory is used to store computer execution instructions, the processor, the memory, and at least A communication interface is connected through a communication bus, and the processor executes the computer-executable instructions stored in the memory to enable the communication device to implement any of the first, third, fifth, seventh, ninth, and eleventh aspects. Any one of the methods provided on the one hand.
  • the device can exist in the form of a chip product.
  • a communication system including the communication devices provided in the second and fourth aspects; or, the communication devices provided in the sixth and eighth aspects; or, the tenth and twelfth aspects provide ⁇ Communication device.
  • a computer-readable storage medium including instructions, which when run on a computer, cause the computer to execute the first, third, fifth, seventh, ninth, and third aspects. Any method provided by any one of the eleven aspects.
  • the sixteenth aspect provides a computer program product containing instructions that, when run on a computer, causes the computer to execute the first, third, fifth, seventh, ninth, and eleventh aspects. Any method provided by any one of the aspects.
  • a chip in a seventeenth aspect, includes: a processor and an interface, the processor is coupled to a memory through the interface, and when the processor executes a computer program or instruction in the memory, the chip Any one of the methods provided in any one of the first aspect, the third aspect, the fifth aspect, the seventh aspect, the ninth aspect, and the eleventh aspect is executed.
  • Figure 1 is a schematic diagram of a network slicing architecture
  • FIG. 2 and Figure 3 are respectively a flow chart of PLMN selection
  • Figure 4 is a flow chart of the 4-step random access process
  • Figure 5 is a flow chart of the 2-step random access process
  • FIG. 6 and FIG. 7 are respectively a diagram of a network architecture to which the embodiments of this application are applicable;
  • FIG. 8 is a flowchart of a communication method provided by an embodiment of this application.
  • FIG. 8A is a flowchart of a communication method provided by an embodiment of this application.
  • FIG. 11A is a flowchart of PLMN selection provided by an embodiment of this application.
  • FIG. 11B is a flowchart of PLMN selection provided by an embodiment of this application.
  • FIG. 12 and FIG. 13 are respectively a flowchart of a PLMN selection provided by an embodiment of this application;
  • FIG. 14 is a flowchart of a communication method provided by an embodiment of this application.
  • 15 is a schematic diagram of the composition of a communication device provided by an embodiment of this application.
  • FIG. 16 is a schematic diagram of the hardware structure of a communication device provided by an embodiment of the application.
  • A/B can mean A or B.
  • “And/or” in this article is only an association relationship describing the associated objects, which means that there can be three kinds of relationships.
  • a and/or B can mean: A alone exists, A and B exist at the same time, and B exists alone. These three situations.
  • “at least one” means one or more, and “plurality” means two or more.
  • the words “first” and “second” do not limit the quantity and order of execution, and the words “first” and “second” do not limit the difference.
  • the network elements involved in this application include access network equipment and terminals in the communication system.
  • the communication systems in the embodiments of the present application include, but are not limited to, long term evolution (LTE) systems, fifth-generation (5th-generation, 5G) systems, new radio (NR) systems, and wireless local area networks (wireless local area networks). area networks, WLAN) systems and future evolution systems or multiple communication fusion systems.
  • LTE long term evolution
  • 5th-generation 5G
  • NR new radio
  • wireless local area networks wireless local area networks
  • area networks wireless local area networks
  • WLAN wireless local area networks
  • future evolution systems or multiple communication fusion systems wireless local area networks
  • the method provided in the embodiments of the present application can be specifically applied to the evolved-universal terrestrial radio access network (E-UTRAN) and the next generation-radio access network (next generation-radio access network). , NG-RAN) system.
  • E-UTRAN evolved-universal terrestrial radio access network
  • next generation-radio access network next generation-radio access network
  • NG-RAN next generation-radio access network
  • the access network device in the embodiment of the present application is an entity on the network side that is used to send signals, receive signals, or send signals and receive signals.
  • the access network equipment can be a device deployed in a radio access network (RAN) to provide wireless communication functions for the terminal, such as a transmission reception point (TRP), a base station, and various forms of control Nodes (for example, a network controller, a wireless controller (for example, a wireless controller in a cloud radio access network (CRAN) scenario)), a roadside unit (RSU), etc.
  • the access network equipment may be various forms of macro base stations, micro base stations (also referred to as small stations), relay stations, access points (access points, AP), etc., and may also be antenna panels of base stations.
  • the control node may be connected to multiple base stations and configure resources for multiple terminals under the coverage of the multiple base stations.
  • RAT radio access technologies
  • the names of devices with base station functions may be different.
  • the LTE system may be called an evolved NodeB (eNB or eNodeB)
  • the 5G system or NR system may be called the next generation node base station (gNB).
  • eNB evolved NodeB
  • gNB next generation node base station
  • the specific name of the base station in this application Not limited.
  • the access network equipment may also be the access network equipment in the public land mobile network (PLMN) that will evolve in the future.
  • PLMN public land mobile network
  • the terminal in the embodiment of the present application is an entity on the user side that is used to receive signals, or send signals, or receive signals and send signals.
  • the terminal is used to provide users with one or more of voice services and data connectivity services.
  • the terminal can also be called user equipment (UE), terminal equipment, access terminal, user unit, user station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user Device.
  • UE user equipment
  • the terminal can be a vehicle to everything (V2X) device, for example, smart car (smart car or intelligent car), digital car (digital car), unmanned car (unmanned car or driverless car or pilotless car or automobile), automatic Automobile (self-driving car or autonomous car), pure electric vehicle (pure EV or battery EV), hybrid electric vehicle (hybrid electric vehicle, HEV), extended-range electric vehicle (range extended EV, REEV), plug-in hybrid electric vehicle Automobile (plug-in HEV, PHEV), new energy vehicle (new energy vehicle), etc.
  • the terminal may also be a device to device (D2D) device, for example, an electric meter, a water meter, and so on.
  • D2D device to device
  • the terminal can also be a mobile station (MS), subscriber unit (subscriber unit), drone, Internet of things (IoT) equipment, station (ST) in WLAN, and cellular phone (cellular phone). ), smart phone (smart phone), cordless phone, wireless data card, tablet computer, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital processing (personal) Digital assistant (PDA) device, laptop computer, machine type communication (MTC) terminal, handheld device with wireless communication function, computing device or other processing device connected to wireless modem, vehicle-mounted device , Wearable devices (also known as wearable smart devices).
  • the terminal may also be a terminal in a next-generation communication system, for example, a terminal in a 5G system or a terminal in a future evolved PLMN, a terminal in an NR system, and so on.
  • RAN sharing means that the RAN is shared by multiple operators.
  • RAN sharing mainly includes three forms: common carrier frequency sharing, sub-carrier frequency sharing, and mixed carrier frequency sharing.
  • common carrier frequency sharing refers to the sharing of RAN resources by multiple operators.
  • RAN resources include cell spectrum resources (for example, time domain resources, frequency domain resources, etc.) and hardware resources of the access network equipment to which the cell belongs (for example, access Computing resources of network equipment, storage resources of access network equipment, etc.).
  • PLMN IDs PLMN IDs
  • Carrier frequency sharing means that multiple operators share the hardware resources of the access network equipment, but do not share spectrum resources (that is, do not share the cell).
  • each cell broadcasts only one PLMN ID, which is used by different operators.
  • the cells are independent, and there is no problem of sharing and using cell air interface resources.
  • Hybrid carrier frequency sharing means that multiple operators share the hardware resources of the access network equipment, and share or exclusively share the spectrum resources of the cell.
  • multiple PLMN IDs may be broadcast in some cells (including the PLMN ID of a primary operator and the PLMN IDs of multiple secondary operators, and the PLMN IDs of primary operators in different cells may be different), and in other cells Only one PLMN ID may be broadcast inside.
  • the method provided in the embodiment of this application is mainly aimed at the scenarios of common carrier frequency sharing and mixed carrier frequency sharing, and is specifically applied to the case where a cell broadcasts multiple PLMN IDs, that is, there are multiple PLMNs on the cell in the embodiment of this application.
  • 5G networks provide users with customized network services through end-to-end network slicing.
  • the 5G network virtualizes multiple logical subnets with different characteristics and isolated from each other on the same physical facility to provide targeted services to users.
  • a logical subnet is a network slice.
  • Figure 1 shows three network slices, namely network slice 1, network slice 2, and network slice 3.
  • Network slice 1, network slice 2 and network slice 3 can be respectively enhanced mobility Broadband (enhanced mobile broadband, eMBB) services, ultra-reliable low latency communications (URLLC) services, and massive machine type of communication (mMTC) services are network slices.
  • eMBB enhanced mobile broadband
  • URLLC ultra-reliable low latency communications
  • mMTC massive machine type of communication
  • the access network device selects the session management function (session management function) to support the network slice through the core access and mobility management function (AMF) that can support the network slice.
  • AMF access and mobility management function
  • SMF session management function
  • NRF network storage function
  • SMF further selects the UPF that supports the network slice.
  • SMF also selects the policy control function (PCF) that supports the network slice.
  • PCF policy control function
  • These network elements provide the service of the network slicing for the terminal. For example, when the terminal initiates a request for network slice 1, the access network device selects the SMF and NRF that support network slice 1 through the AMF that can support network slice 1. SMF further selects the UPF that supports network slice 1. Optionally, SMF also supports network slice 1. The PCF that supports network slice 1 is selected, and the service of network slice 1 is provided to the terminal through these selected network elements.
  • S-NSSAI single network slice selection assistance information
  • SST Slice/service type
  • a slice differentiator (SD) (optional), as a supplement to SST, can further distinguish multiple network slice instances that meet the same SST.
  • the identifier of the network slice may also be any one or more of the following parameters:
  • Network slice type information can indicate network slice types such as eMBB, URLLC, mMTC, etc.
  • the network slice type information can also indicate the end-to-end network slice type, including RAN to core network
  • the (core network, CN) network slice type may also refer to the RAN side network slice type, or the CN side network slice type;
  • the service type information is related to a specific service.
  • the service type information may indicate service characteristics such as video service, car networking service, voice service, etc., or specific service information. It should be understood that the service type information and the network slice type information can be combined into one type of information;
  • Tenant information which is used to instruct customer information for creating or renting the network slice, such as company A, company B, etc.;
  • User group information which is used to indicate grouping information for grouping users according to a certain characteristic, such as user level
  • Slice group information which is used to indicate that according to a certain characteristic, for example, all network slices that can be accessed by the terminal device can be regarded as a slice group, or network slice groups can also be divided according to other standards;
  • Network slice instance information used to indicate the instance identifier and characteristic information created for the network slice.
  • an identifier can be assigned to the network slice instance to indicate the network slice instance, or it can be in the network slice instance identifier.
  • the receiver Based on mapping a new identifier and associating the network slice instance, the receiver can identify the specific network slice instance indicated by the identifier according to the identifier;
  • a dedicated core network (DCN) identifier which is used to uniquely indicate a dedicated core network in an LTE system or an eLTE system, such as a dedicated core network for the Internet of Things.
  • the DCN identifier It can be mapped with the network slice identifier, the network slice identifier can be mapped from the DCN identifier, and the DCN identifier can also be mapped through the network slice identifier;
  • Network slice differentiation which is used to further distinguish the information of network slices.
  • two or more network slices have the same network slice type and/or service type, but the information can be further differentiated according to the network slice.
  • the two or more network slices are distinguished, that is, the network slice type information and the network slice distinction can be used to identify one network slice.
  • the identifier of a network slice may be characterized by a network slice type, or may also be characterized by a network slice type and a service type, or also The service type plus tenant information characterization can be used, which is not limited in the embodiment of the present application.
  • the access stratum (AS) of the terminal After the terminal is turned on, the access stratum (AS) of the terminal automatically searches the network, or the non-access stratum (NAS) of the terminal searches for specified network parameters to realize PLMN selection.
  • AS access stratum
  • NAS non-access stratum
  • PLMN selection processes There are two PLMN selection processes, one is the PLMN selection process when the terminal has no prior information, and the other is the PLMN selection process when the terminal stores the prior information.
  • the processes of the two are slightly different.
  • the terminal will perform a full-band search, and report the strongest cell on each frequency point to the NAS layer of the terminal.
  • the NAS layer decides whether to continue the PLMN search. For details, see figure 2. If the terminal stores a priori information, the NAS layer instructs the AS layer to perform a PLMN search according to the parameters of the prior information, and reports the result to the NAS layer.
  • the specific process can be seen in Figure 3. The specific implementation of each step in FIG. 2 and FIG.
  • PCCPCH primary common control physical channel
  • the NAS instructs the AS to perform the cell search process of the designated PLMN according to the selected PLMN.
  • the cell search process is divided into two situations. One is the initial cell search where the terminal has no stored information. At this time, the terminal needs to perform a full frequency search and search for the strongest cell on each frequency point. When the S criterion is met, it can be Select this cell to camp on. Another case is the cell search process where the terminal stores cell information. At this time, the terminal only needs to search on these cells, and after finding it, judge whether it meets the S criterion. When the S criterion is met, the terminal selects this cell to camp on. .
  • the output result of PLMN selection is that NAS has obtained the current PLMN information that meets the conditions to prepare for cell selection.
  • the output result of the cell selection is to find a suitable (SUITABLE) cell belonging to the PLMN selected by the NAS, and successfully camp on, to prepare for the next step of initiating a radio resource control (Radio Resource Control, RRC) connection or cell reselection.
  • RRC Radio Resource Control
  • the terminal After the cell search process, the terminal has achieved downlink synchronization with the cell. Next, the terminal needs to obtain system information (SI) of the cell so that it can know how the cell is configured, so as to access the cell and work normally in the cell.
  • SI system information
  • the system information of the LTE system is mainly divided into: master information block (MIB), system information blocks (system information blocks, SIBs), and SIBs are divided into 26 types: system information block type 1 (system information block type 1) to System information block type 26 (system information block type 26), abbreviated as: SIB1, SIB2,..., SIB26.
  • MIB master information block
  • SIBs system information blocks
  • SIBs System information blocks
  • 26 types system information block type 1 (system information block type 1) to System information block type 26 (system information block type 26), abbreviated as: SIB1, SIB2,..., SIB26.
  • SIB1 system information block type 1
  • SIB2 System information block type 26
  • SIB1 System information block type 1
  • SIB2 System information block type 26
  • NR system information is mainly divided into MIB and SIBs.
  • SIBs other than MIB and SIB1 are called other system information (OSI), and SIBs are divided into 9 types: system information block type 1 (system information block type 1) to system information Block type 9 (S system information block type9), abbreviated as: SIB1, SIB2, ..., SIB9.
  • SIB1, SIB2, ..., SIB9 system information block type 1
  • SIB1 system information block type 1
  • SIB9 system information Block type 9
  • the terminal can establish an RRC connection with the access network device to which the cell belongs through a random access process.
  • the random access process is used for the terminal to establish a connection with the cell and obtain uplink synchronization.
  • the random access process is divided into a 4-step random access process and a 2-step random access process. There are two types of random access: contention-based and non-competition-based.
  • FIG. 4 shows a schematic diagram of a 4-step random access process.
  • the contention-based random access process includes the following steps 401 to 404, and the non-contention-based random access process includes the following steps 401 and 402.
  • the terminal sends a message 1 (Msg1) to the access network device, and the message 1 includes a preamble.
  • the preamble may also be referred to as a random access preamble, a random access preamble sequence, a preamble sequence, and the like.
  • Message 1 can tell the access network device that there is a random access request, and at the same time enables the access network device to estimate the transmission delay between it and the terminal and determine the timing advance (TA) accordingly.
  • Message 1 can be carried on a physical random access channel (PRACH).
  • PRACH physical random access channel
  • the PRACH resource and preamble are selected by the terminal, and different terminals may select the same PRACH resource and the same preamble at the same time, which leads to conflicts.
  • a contention resolution mechanism is needed. (That is, step 403 and step 404) to solve this problem.
  • the terminal Based on non-competitive random access, the terminal already has a unique identifier in the accessed cell.
  • Cell-radio network temporary identifier (C-RNTI) and the PRACH resource and preamble are determined by the access network equipment It is specified to ensure that it will not conflict with other terminals, and there is no need for a contention resolution mechanism (that is, steps 403 and 404 are not needed).
  • the access network device sends a message 2 (Msg2) to the terminal.
  • Msg2 message 2
  • the message 2 may be a random access response (RAR).
  • RAR random access response
  • the message 2 may include a TA, and the TA is the TA calculated by the access network device for the terminal according to the message 1.
  • the terminal sends a message 3 (Msg3) to the access network device.
  • Msg3 message 3
  • the terminal may use the TA in the message 2 to send the message 3 to the access network device.
  • Message 3 needs to contain one important piece of information: contention resolution ID information of the terminal, which will be used for contention resolution ID in step 404.
  • the access network device sends a message 4 (Msg4) to the terminal, indicating the result of the random access competition of the terminal.
  • Msg4 message 4
  • the access network device will carry the contention resolution identification of the terminal in the message 4 to specify the terminal that succeeds in the contention resolution, and other terminals that have not succeeded in the contention resolution will re-initiate random access.
  • Figure 5 shows a schematic diagram of a 2-step random access process, including:
  • the terminal sends a message A (MsgA) to an access network device.
  • MsgA message A
  • message A includes a random access signal and payload data.
  • the random access signal may include a preamble and/or a demodulation reference signal (DMRS).
  • DMRS demodulation reference signal
  • the random access signal is used to receive payload data, for example, According to the random access signal, the transmission boundary of the payload data (such as the start position and the end position of the slot for transmitting the payload data) or demodulation can be determined.
  • the payload data may be control plane data and/or user plane data, and the payload data may correspond to the content contained in message 3 in the aforementioned 4-step random access mechanism.
  • the payload data may include any one of RRC connection request, terminal identification, scheduling request, buffer status report (buffer status report, BSR), and real service data.
  • the access network device sends a message B (MsgB) to the terminal.
  • MsgB message B
  • message B is used to carry a response message for the random access signal and payload data.
  • the response message may include at least one of the following: C-RNTI information, TA command information, uplink authorization information, contention resolution identification information, and so on.
  • the contention resolution identification may be part or all of the content of the payload data.
  • the response message also includes a control plane message (which can also be regarded as a response message based on scheduled transmission).
  • the response message may also include one of the following: RRC connection (RRCSetup) message , RRC reestablishment (RRCReestablishment) message, RRC resume (RRCResume) message, etc.
  • the method provided by the embodiment of the present application can be applied to the network architecture shown in FIG. 6 and FIG. 7.
  • the access network device is a complete entity.
  • the access network equipment covers one or more cells (3 cells are taken as an example for drawing in FIG. 6), and terminals (for example, terminal 1 and terminal 2 in FIG. 6) can communicate with the access network equipment in a certain cell.
  • the access network equipment is in a form in which a centralized unit (centralized unit, CU) and a distributed unit (distributed unit, DU) are separated.
  • the access network equipment may include CU, DU, and active antenna unit (AAU).
  • the CU can manage one or more DUs (3 DUs are used as an example for drawing in Figure 7), and each DU can cover one or more cells.
  • DU1 covers 3 cells
  • DU2 covers 2 Cell
  • DU3 covers 1 cell.
  • Terminals (for example, terminal 1 and terminal 2 in FIG. 7) can communicate with the CU in a certain cell through the DU to which the cell belongs.
  • the CU implements part of the functions of the access network equipment
  • the DU implements part of the functions of the access network equipment.
  • the CU is responsible for processing non-real-time protocols and services, and implements the functions of the RRC layer and the packet data convergence protocol (PDCP) layer.
  • the DU is responsible for processing the physical layer protocol and real-time services, and realizes the functions of the radio link control (RLC) layer, the media access control (MAC) layer, and the physical (PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical
  • AAU realizes some physical layer processing functions, radio frequency processing and related functions of active antennas.
  • the CU can be divided into network devices in the RAN, or the CU can be divided into network devices in the core network (core network, CN), which is not limited here.
  • the first embodiment is applicable to the network architecture shown in FIG. 7 above.
  • the first embodiment provides a communication method, which can be applied in a RAN sharing scenario, and is used to perform access control on a terminal for a network slice, so as to achieve resource balance of the same network slice under different PLMNs.
  • the communication method includes:
  • the DU obtains resource occupation information of each network slice under at least two PLMNs supported by a cell of the DU, and each network slice under the at least two PLMNs shares resources.
  • the cell of the DU can be any cell covered by the DU, which is not limited in this application.
  • the resource occupancy information of a network slice may be the resource occupancy rate of the network slice, the amount of resources occupied by the network slice, or an indication of whether the network slice is overloaded. Among them, whether a network slice is overloaded can be determined according to the resource occupancy rate of the network slice and/or the amount of resources occupied by the network slice. For example, when the resource occupancy rate of a network slice is greater than or equal to a threshold (denoted as threshold 1), and/or the amount of resources occupied by the network slice is greater than or equal to a threshold (denoted as threshold 2), the network is considered The sliced resource is overloaded.
  • the threshold value 1 and the threshold value 2 may be preset or predefined or stipulated by an agreement or negotiated and determined by the access network device and the terminal, which are not limited in this application.
  • Shared resources by multiple network slices means that multiple network slices can use the resource, but once a part of the resource is used by one network slice, other network slices can no longer use this part of the resource and can only use the resource Other resources.
  • the resources shared by each network slice under the above at least two PLMNs include any one or more of the following resources: DU hardware resources (including DU storage resources and/or DU computing resources), CU hardware resources (including The storage resources of the CU and/or the computing resources of the CU), and the spectrum resources of the cell.
  • the DU sends resource occupation information to the CU, and correspondingly, the CU receives the resource occupation information from the DU.
  • the resource occupation information may be carried in a gNB-DU status indication (gNB-DU status indication) message.
  • gNB-DU status indication gNB-DU status indication
  • one network slice may correspond to one resource occupation information.
  • the cell supports 2 PLMNs, namely PLMN1 and PLMN2, PLMN1 supports 2 network slices, namely network slice 1 and network Slice 2, PLMN2 supports 3 network slices, namely network slice 1, network slice 2, and network slice 3.
  • the resource occupancy rate of network slice 1 under PLMN1 is 0.15
  • the resource occupancy rate of network slice 2 under PLMN1 is 0.08
  • the resource occupancy rate of network slice 1 under PLMN2 is 0.1
  • the resource occupancy rate of the network slice 3 under PLMN2 is 0.05
  • the resource occupancy information reported by the DU to the CU may be as shown in Table 1 or Table 2.
  • multiple network slices may correspond to one resource occupation information.
  • the multiple network slices correspond to one resource occupation information.
  • the information in Table 1 and Table 2 may be in the form of Table 3 or Table 4 when reporting.
  • CU uses resource occupation information.
  • the CU may perform access control on one or more network slices under the above-mentioned at least two PLMNs according to the resource occupation information. For example, if a terminal needs to access a network slice under a PLMN, the CU may determine whether to allow the terminal to access the network slice under the PLMN according to the resource occupation information.
  • the resource allocation of the same network slice under different PLMNs may be unbalanced.
  • PLMN1 and PLMN2 share RAN resources.
  • the network slices that PLMN1 can provide include network slice 1 and network slice 2.
  • the network slice services that PLMN2 can provide include network slice 1, network slice 2 and network slice 3.
  • the terminal does not select the PLMN for its service based on the current resource occupation of network slice 1, but only according to the prior information and The signal strength of the cell is selected for PLMN, which may lead to an unbalanced resource allocation of network slice 1 in PLMN1 and PLMN2 (for example, network slice 1 of a large operator has more users).
  • the DU can send the resource occupation information of each network slice under each PLMN in the cell to the CU, so that the CU can use the resource occupation Information, achieve resource balance, and avoid unbalanced resource allocation of the same network slice under different PLMNs.
  • the method further includes step 11) and step 12):
  • the terminal sends request information to the DU.
  • the DU receives the request information from the terminal.
  • the request information includes the identity of the first PLMN and the identity of the first network slice, and the request information is used by the terminal to request access to the first network slice under the first PLMN.
  • Step 11) and the above-mentioned step 802 are executed in no particular order.
  • the request information between the terminal and the DU can be carried in the RRC Setup Complete (RRCSetupComplete) message.
  • DU sends request information to CU.
  • the CU receives the request information from the DU.
  • the request information between the DU and the CU can be carried in the gNB-DU status indication message.
  • step 803 can have the following two cases (denoted as case 1 and case 2).
  • step 803 may include in specific implementation: 13a)
  • the CU determines that the terminal is not allowed to access the first network slice under the first PLMN according to the resource occupation information, and the terminal establishes an RRC connection with the CU
  • the CU sends
  • the DU sends release information, which is used to instruct the terminal to release the RRC connection with the CU.
  • the DU receives the release information from the CU.
  • the release information between the DU and the CU may be carried in a downlink RRC transmission message (DL RRC message transfer).
  • DL RRC message transfer a downlink RRC transmission message
  • the resource occupation information is used by the CU to determine whether to allow the terminal to access the first network slice under the first PLMN.
  • step 13a) can be specifically implemented in any one of the following manners 1 to 3.
  • the CU When the CU determines, according to the resource occupation information, that the resource occupation rate of the first network slice under the first PLMN is greater than or equal to the threshold, the CU sends release information to the DU.
  • the threshold may be preset or predefined or stipulated by agreement or negotiated and determined by the access network device and the terminal, which is not limited in this application.
  • the CU determines that the resource occupancy rate of the first network slice under the first PLMN is greater than or equal to the threshold according to the resource occupancy information, the CU does not allow the terminal to access the first network slice under the first PLMN, and therefore sends a release to the DU information.
  • the resource occupancy rate of a network slice may be characterized by only the hardware resource occupancy rate or the spectrum resource occupancy rate of the network slice, or may be jointly characterized by the hardware resource occupancy rate and the spectrum resource occupancy rate.
  • the weighted sum of the hardware resource occupancy rate and the spectrum resource occupancy rate can be used as the resource occupancy rate of the network slice, or the hardware resource occupancy rate and the spectrum resource occupancy rate can be averaged as the resource occupancy rate of the network slice.
  • the resource occupancy rate of the network slice can also be obtained by other calculation methods, which is not limited in this application.
  • the hardware resource occupancy rate of network slicing can only be characterized by the DU storage resource occupancy rate, the DU computing resource occupancy rate, the CU storage resource occupancy rate, or the CU computing resource occupancy rate.
  • the multiple characterizations of the network slice are similar to the characterization method of the resource occupancy rate of the network slice, and will not be repeated here. This part of the description about the resource occupancy rate of the network slice is applicable to other parts of this embodiment, and is also applicable to other embodiments, and will not be repeated hereafter.
  • the first PLMN is PLMN1
  • the first network slice is network slice 1
  • the threshold is 0.12
  • the resource occupancy rate of network slice 1 of PLMN1 is 0.15
  • the CU sends a release message to the DU.
  • the resource occupation rate in the first method can be replaced with the resource occupation.
  • the CU When the CU determines according to the resource occupation information that the first network slice under the first PLMN is not the first network slice with the lowest resource occupation rate among the first network slices under the at least two PLMNs, the CU sends release information to the DU.
  • the CU determines that the first network slice under the first PLMN is not the first network slice with the lowest resource occupancy rate among the first network slices under the at least two PLMNs, the CU does not allow the terminal to access the first network slice according to the resource occupation information.
  • the first network slice in a PLMN therefore, sends a release message to the DU.
  • the CU sends a release message to the DU.
  • the resource occupation rate in the second method can be replaced with the resource occupation.
  • the CU determines that the resources of the first network slice under the first PLMN are overloaded according to the resource occupation information, the CU sends release information to the DU.
  • the CU determines the resource overload of the first network slice under the first PLMN according to the resource occupation information, the CU does not allow the terminal to access the first network slice under the first PLMN, and therefore, sends release information to the DU.
  • PLMN1 supports two network slices, namely network slice 1 and network slice 2
  • PLMN2 supports three network slices, namely network slice 1, network slice 2.
  • network slice 3 Refer to Table 5 or Table 6 or Table 7 or Table 8 for resource occupancy information of each network slice. If the first PLMN is PLMN1 and the first network slice is network slice 1, because the resources of network slice 1 under PLMN1 are overloaded, the CU sends release information to the DU.
  • the release information includes a release reason
  • the release reason includes: insufficient resources of the first network slice under the first PLMN.
  • the DU sends release information to the terminal.
  • the terminal receives release information from the DU.
  • the terminal can release the RRC connection with the CU according to the release information.
  • the release information between the terminal and the DU may be carried in an RRC release (RRC release) message.
  • RRC release RRC release
  • the CU sends a reason for denying terminal access to the AMF in the first PLMN, and the reasons include: insufficient resources of the first network slice under the first PLMN.
  • Step 14a) and step 15a) are executed in no particular order.
  • step 803 may include in specific implementation: 13b) In the case that the CU determines that the terminal is allowed to access the first network slice in the first PLMN according to the resource occupation information, the CU sends the request information to the first network slice in the first PLMN. AMF.
  • the CU determines, according to the resource occupation information, that the resource occupation rate (or resource occupation) of the first network slice under the first PLMN is less than the threshold, or the CU determines the resource occupation rate in the first PLMN according to the resource occupation information
  • the first network slice is the first network slice with the lowest resource occupancy rate (or resource occupancy) among the first network slices under the at least two PLMNs, or, the CU determines that the first PLMN is under the resource occupancy information
  • the CU sends the request information to the core network device in the first PLMN.
  • FIG. 9 The process shown in FIG. 9 includes:
  • the terminal sends an RRC setup request (RRCSetupRequest) to the DU in the cell of the DU.
  • RRCSetupRequest RRC setup request
  • the DU sends an initial uplink RRC transmission message (initial UL RRC message transfer) to the CU.
  • the CU sends a downlink RRC transmission message (DL RRC message transfer) to the DU.
  • DL RRC message transfer a downlink RRC transmission message
  • the DU sends an RRC setup (RRC Setup) message to the terminal.
  • RRC setup RRC Setup
  • steps 901 to 904 are random access procedures of the terminal, which are used for the terminal to establish an RRC connection with the CU.
  • the terminal sends an RRC Setup Complete (RRCSetupComplete) message to the DU.
  • RRCSetupComplete RRC Setup Complete
  • the RRC establishment complete message includes request information, and the request information includes the identity of the first PLMN and the identity of the first network slice.
  • the request information may be used by the terminal to request access to the first network slice in the first PLMN.
  • the DU sends a gNB-DU status indication message to the CU.
  • the gNB-DU status indication message may carry resource occupation information of each network slice under at least two PLMNs of the cell.
  • a PLMN resource occupation list PLMN Resource Occupation List
  • PLMN Resource Occupation List PLMN Resource Occupation List
  • the DU can send the resource occupation information to the CU at any time.
  • the CU determines whether to allow the terminal to access the first network slice under the first PLMN according to the resource occupation information.
  • step 907 For the specific implementation of step 907, refer to the foregoing manner 1 to manner 3, and details are not described herein again.
  • step 908 and step 909 are executed after step 907, and if not, step 910 is executed after step 907.
  • the CU sends a downlink RRC transmission message to the DU.
  • the downlink RRC transmission message includes release information, and the release information is used to instruct the terminal to release the RRC connection with the CU.
  • the method further includes: the CU releases the RRC connection with the terminal.
  • the DU sends an RRC release message to the terminal.
  • the RRC release message includes release information.
  • the CU sends request information to the AMF in the first PLMN.
  • step 910 The subsequent processes after step 910 can be referred to the prior art, which will not be repeated here.
  • the DU and the CU can obtain the resource occupation information of each network slice under at least two PLMNs of the current cell through interaction, thereby controlling the access of the terminal and achieving different The uniform distribution of resources of the same network slice under the PLMN.
  • the second embodiment can be applied to the network architectures shown in FIG. 6 and FIG. 7, and of course, it can also be applied to other network architectures.
  • the CU and one or more DUs connected to the CU form the access network device in the second embodiment.
  • the actions performed by the access network device can be performed by the CU and DU in cooperation (for example, CU
  • the resource occupancy information can be exchanged with the DU.
  • the cell in Embodiment 2 is a cell covered by a DU connected to the CU.
  • the second embodiment provides a communication method, which can be applied to the RAN sharing scenario.
  • the access network device sends the resource occupation information of each network slice under at least two PLMNs of the cell of the access network device to the terminal, so that the terminal
  • the PLMN selection can be performed with reference to the resource occupation information of each network slice, so as to realize the uniform allocation of resources of the same network slice under different PLMNs.
  • the communication method includes:
  • An access network device obtains resource occupation information of each network slice under at least two PLMNs of a cell of the access network device, and each network slice under at least two PLMNs shares resources.
  • step 1001 is an optional step.
  • the cell of the access network device may be any cell covered by the access network device, which is not limited in this application.
  • the resources shared by each network slice under at least two PLMNs include any one or more of the following resources: hardware resources of the access network device (including the storage of the access network device) Resources and/or computing resources of access network equipment), and spectrum resources of the cell.
  • the access network device sends resource occupation information to the terminal.
  • the terminal receives resource occupation information from the access network device.
  • the access network device may send an RRC message including resource occupation information to the terminal, or may broadcast system information including resource occupation information. After receiving the system information, the terminal may decode the system information to obtain Resource occupation information.
  • the system information may be any system information in the existing system information, or any system information in the system information that will evolve in the future, which is not limited in this application.
  • resource occupation information can be added to the cell access related information (cellAccessRelatedInfo) cell in SIB1.
  • one network slice can correspond to one resource occupancy information, such as the example shown in Table 1 or Table 2, or Table 5 or Table 6, or multiple network slices can correspond to one resource occupation. Information, for example, the examples shown in Table 3 or Table 4 or Table 7 or Table 8 above.
  • the terminal may determine whether to request access to a certain network slice under a certain PLMN according to the above resource occupation information.
  • the access network device can send the resource occupation information of each network slice under at least two PLMNs of the cell of the access network device to the terminal, and the terminal can use the resource occupation information to achieve resource balance.
  • the system information does not include the resource occupation information of the network slices under each PLMN of the cell, and it is impossible for the terminal to select the PLMN and request the corresponding network slice service to provide reference information, which may result in the same network slice resources under different PLMNs.
  • the allocation is unbalanced.
  • resource occupation information can be added to the system information, so as to provide a reference for the terminal to select a PLMN and request the corresponding network slicing service, so as to avoid the unbalanced resource allocation of the same network slice under different PLMNs. .
  • step 1003 includes in specific implementation:
  • the terminal sends request information to the access network device with reference to the resource occupation information, where the request information includes the identity of the first PLMN and the identity of the first network slice, and the request information is used to request access to the first network slice under the first PLMN.
  • the request information can be carried in message 5.
  • step 1003a includes in specific implementation:
  • the terminal selects the first PLMN with reference to the resource occupation information.
  • the terminal sends request information to the access network device.
  • the terminal can also select the first network slice, which can be specifically selected according to the service requirements of the terminal.
  • the access network device receives a message carrying request information (for example, the request information can be carried in the message header of the message), determines according to the message that the PLMN that the terminal requests to access is the first PLMN, and sends the message It is sent to the core network device in the first PLMN. After receiving the message, the core network device decides whether to allow the terminal to access, and sends an access acceptance message or an access rejection message to the terminal.
  • a message carrying request information for example, the request information can be carried in the message header of the message
  • the core network device decides whether to allow the terminal to access, and sends an access acceptance message or an access rejection message to the terminal.
  • the access network device sends system information to the terminal, and the system information includes resource occupation information.
  • the terminal decodes system information and obtains resource occupation information.
  • the terminal selects the first network slice and the first PLMN with reference to the resource occupation information.
  • the terminal sends a message carrying request information to the access network device.
  • the access network device determines, according to the message carrying the request information, that the PLMN that the terminal requests to access is the first PLMN.
  • the access network device sends a message carrying request information to a core network device (for example, AMF) in the first PLMN.
  • AMF core network device
  • the core network device in the first PLMN decides whether to allow the terminal to access.
  • the core network device in the first PLMN sends an access acceptance message or an access rejection message to the terminal.
  • the core network device in the first PLMN decides to allow the terminal to access the first network slice of the first PLMN, the core network device in the first PLMN sends an access acceptance message to the terminal; otherwise, the first PLMN A core network device in a PLMN sends an access rejection message to the terminal.
  • step 1003a-1 can be implemented by way 1 or way 2 below.
  • method 1 includes step 11) to step 13):
  • the terminal determines a list of PLMNs, one PLMN in the list corresponds to one cell, and the signal strength of the cell corresponding to one PLMN is greater than or equal to the first threshold.
  • one PLMN corresponds to one cell, but one cell can correspond to multiple PLMNs.
  • the first threshold may be preset or predefined or stipulated in an agreement or negotiated and determined by the access network device and the terminal, which is not limited in this application.
  • the terminal judges according to the signal strength of the cells corresponding to the PLMN in the list in descending order, until it determines a PLMN that satisfies the first condition.
  • a PLMN that satisfies the first condition includes: the PLMN can provide the terminal with The first network slice and the resources occupied by the first network slice under the PLMN meet the second condition.
  • Step 12 the terminal can sort the PLMNs in order of the signal strengths of the cells corresponding to the PLMNs in the list, and then determine whether the PLMNs meet the first condition in order from front to back according to the sorting results.
  • the resources occupied by the first network slice under a PLMN meet the second condition, including: the resource occupancy rate of the first network slice under the PLMN is less than or equal to a second threshold; or, the first network under the PLMN The amount of resources occupied by the slice is less than or equal to the third threshold; or, the resources of the first network slice under the PLMN are not overloaded.
  • the second threshold and/or the third threshold may be preset or predefined or stipulated in an agreement or negotiated and determined by the access network device and the terminal, which is not limited in this application.
  • the terminal determines a PLMN that meets the first condition as the first PLMN.
  • the terminal can first determine the resource occupation corresponding to the first network slice under PLMN3 If the rate is less than or equal to 0.2, and the result is no, the terminal does not select PLMN3 as the first PLMN, and the terminal then determines whether the resource occupancy rate corresponding to the first network slice under PLMN2 is less than or equal to 0.2, and the result is yes. Therefore, the terminal determines PLMN2 is the first PLMN.
  • Fig. 12 An exemplary process for the terminal to perform PLMN selection can be seen in Fig. 12, which includes:
  • a terminal receives system information broadcast by an access network device in a cell of the access network device, and obtains resource occupation information in the system information.
  • the terminal determines a list of PLMNs, and the PLMNs in the list are sorted in order of signal strength of cells corresponding to the PLMNs from strong to weak.
  • the terminal judges whether the i-th PLMN in the list meets the first condition, and the initial value of i is 1.
  • the terminal determines that the i-th PLMN is the first PLMN.
  • step 1201 can be performed at the same time as the step "read system information to obtain PLMN ID" in FIG. 2, and step 1202 to step 1204 in FIG. 12 may be performed after the step "NAS layer instructs to stop searching for PLMN" in FIG.
  • Method 1 is suitable for PLMN selection without prior information.
  • mode 2 includes step 21) and step 22):
  • the terminal determines that the PLMN that meets the first condition is the first PLMN; otherwise, the terminal determines the list of PLMNs.
  • the terminal judges according to the signal strength of the cells corresponding to the PLMN in the list in descending order, until it determines a PLMN that meets the first condition, and determines the PLMN that meets the first condition as the first PLMN.
  • One PLMN corresponds to one cell, and the signal strength of the cell corresponding to one PLMN is greater than or equal to the first threshold.
  • a PLMN satisfies the first condition includes: the PLMN can provide the first network slice for the terminal, and the resources occupied by the first network slice under the PLMN meet the second condition.
  • the PLMN can provide the first network slice for the terminal, and the resources occupied by the first network slice under the PLMN meet the second condition.
  • the PLMN maintained by the terminal can be stored in the terminal.
  • the PLMN maintained by the terminal includes one or more of RPLMN, EPLMN, HPLMN, and EHPLMN.
  • determining whether there is a PLMN that meets the first condition in the PLMN maintained by the terminal it is also determined in the order of RPLMN, EPLMN, HPLMN, and EHPLMN. For example, if the PLMN maintained by the terminal includes RPLMN and HPLMN, when determining whether there is a PLMN that meets the first condition in the PLMN maintained by the terminal, first determine whether the RPLMN meets the first condition, and then determine whether the HPLMN meets the first condition.
  • RPLMN refers to a registered PLMN (Rigistered PLMN), that is, the PLMN that the terminal successfully registered last time, and the PLMN ID is stored in the memory of the terminal.
  • EPLMN refers to equivalent PLMN (Equivalent PLMN), that is, the equivalent PLMN of the currently selected PLMN, that is, the equivalent PLMN of RPLMN, and the PLMN is stored in the memory of the terminal.
  • HPLMN refers to the home PLMN (Home PLMN), that is, the home PLMN of the USIM card, which represents the PLMN that issued the USIM card.
  • the PLMN ID of the Home PLMN is obtained from the international mobile subscriber identity (IMSI) number of the USIM card (the first few digits of the IMSI number are the Home PLMN ID).
  • EHPLMN refers to the equivalent home PLMN (Equivalent Home PLMN), that is, the equivalent PLMN of the home PLMN of the USIM card, that is, the PLMN that is treated exactly the same as the home PLMN.
  • the PLMN ID of the EHPLMN is stored in the "EHPLMN List" table of the USIM card, and is arranged from high to low in order of priority (the highest priority is first). When the terminal selects PLMN, it is also based on priority from high to low. Select one by one.
  • both RPLMN and HPLMN can provide the first network slice, and the resource occupancy rates corresponding to the first network slice under RPLMN and HPLMN are respectively 0.1 and 0.1, and the second threshold is 0.2, the terminal first determines whether the resource occupancy rate corresponding to the first network slice under RPLMN is less than or equal to 0.2, the result is no, and then determines whether the resource occupancy rate corresponding to the first network slice under HPLMN is less than or equal to 0.2, and the result is also If no, the terminal determines the list of PLMNs.
  • the list of PLMNs includes PLMN1, PLMN2, and PLMN3, PLMN1, PLMN2, and PLMN3 can all provide the first network slice, and the resource occupation corresponding to the first network slice under PLMN1, PLMN2, and PLMN3 Rates are 0.2, 0.15, 0.3, and the signal strengths of the cells corresponding to the PLMN list are PLMN3, PLMN2, and PLMN1 from high to low, and the terminal determines whether the resource occupancy rate corresponding to the first network slice under PLMN3 is less than or equal to 0.2 , The result is also no, and then it is determined whether the resource occupancy rate corresponding to the first network slice under PLMN2 is less than or equal to 0.2, and the result is yes. Therefore, the terminal determines that PLMN2 is the first PLMN.
  • the PLMN maintained by the terminal includes RPLMN, EPLMN, HPLMN, and EHPLMN.
  • the process of selecting the PLMN by the terminal can be seen in Figure 13, including:
  • a terminal receives system information broadcast by an access network device in a cell of the access network device, and obtains resource occupation information in the system information.
  • the terminal sequentially sorts the PLMN in the order of RPLMN, EPLMN, HPLMN, and EHPLMN to obtain the first list.
  • EPLMN may include multiple PLMNs
  • EHPLMN may also include multiple PLMNs.
  • the number of PLMNs in the first list is M.
  • the terminal judges whether the i-th PLMN in the first list meets the first condition, and the initial value of i is 1.
  • the terminal determines that the i-th PLMN is the first PLMN.
  • the terminal determines a second list of PLMNs, and the PLMNs in the second list are sorted in order from strong to weak signal strength of the cells corresponding to the PLMN.
  • one PLMN in the second list corresponds to one cell, and the signal strength of the cell corresponding to one PLMN is greater than or equal to the first threshold.
  • the terminal judges whether the jth PLMN in the second list meets the first condition, and the initial value of j is 1.
  • the terminal determines that the jth PLMN is the first PLMN.
  • step 1301 can be performed at the same time as the step “read system information to obtain PLMN ID" in FIG. 3, and step 1302 to step 1307 in FIG. 13 can be performed after the step "NAS layer instructs to stop searching for PLMN" in FIG.
  • Method 2 is suitable for PLMN selection with prior information.
  • the terminal considers the resource occupation information of the network slices under each PLMN in the existing PLMN selection principle, so that the terminal selects resource occupation as much as possible There are fewer PLMNs to which network slices belong, so that resource balance can be achieved.
  • the third embodiment can be applied to the network architectures shown in FIG. 6 and FIG. 7, and of course, it can also be applied to other network architectures.
  • the CU and one or more DUs connected to the CU form the access network device in the third embodiment.
  • the actions performed by the access network device can be performed by the CU and DU in cooperation (for example, CU
  • the resource occupancy information can be exchanged with the DU.
  • the cell in the third embodiment is a cell covered by a DU connected to the CU.
  • the third embodiment provides a communication method in which the terminal indicates the requested PLMN and network slice through a message in the random access process, thereby avoiding the above-mentioned problem 3.
  • the third embodiment can also be applied to the RAN sharing scenario, and the access network device can perform access control on the terminal according to the resource occupation information of each network slice under at least two PLMNs in the cell, so as to achieve different PLMNs. Uniform distribution of resources for the same network slice.
  • the communication method includes:
  • a terminal sends a first message to an access network device in a cell of the access network device.
  • the access network device receives the first message from the terminal in the cell of the access network device.
  • the first message is a message in the random access process.
  • the first message is message 1 or message 3 or message A.
  • the first message can indicate the first PLMN and/or the first network slice, where the first PLMN is the PLMN that the terminal wants to access, and the first network slice is the network slice that the terminal wants to access.
  • the cell of the access network device may be any cell covered by the access network device, which is not limited in this application.
  • the access network device sends a first response to the terminal.
  • the terminal receives the first response from the access network device.
  • the first response includes information about whether to allow the terminal to access the first PLMN and/or the first network slice.
  • the first response is message 2
  • the first response is message 4
  • the first response is message 4
  • the first response is message B.
  • step 1402 is an optional step. In this case, if the terminal does not receive the first response from the access network device within a certain period of time after sending the first message, it is considered that access to the first message is not allowed. PLMN and/or first network slice.
  • step 1402 when step 1402 is specifically implemented, it includes:
  • the access network device sends a first response to the terminal according to the resource occupation information of each network slice under the at least two PLMNs in the cell, and each network slice under the at least two PLMNs shares resources.
  • the access network device can use any one of the methods in the first embodiment to the third method to determine whether to allow the terminal to access the first PLMN and/or the first network slice, and it will be determined after the determination.
  • the result is carried in the first response and sent to the terminal, so that the resources of the same network slice under different PLMNs can be evenly allocated.
  • the only difference is that it is determined by the access network equipment here, and if it is determined whether the terminal is allowed to access the first PLMN, then according to the resource occupation information of the first PLMN (for example, the resource occupation rate of the first PLMN, the resource occupation , Whether the resource is overloaded, etc.) can be determined.
  • the resource occupation information of the first PLMN for example, the resource occupation rate of the first PLMN, the resource occupation , Whether the resource is overloaded, etc.
  • the resources shared by each network slice under at least two PLMNs include any one or more of the following resources: hardware resources of the access network device (including the storage of the access network device) Resources and/or computing resources of access network equipment), and spectrum resources of the cell.
  • the first response includes a rejection reason
  • the rejection reason includes: insufficient resources of the first PLMN and/or the first network slice.
  • the terminal only carries the identification of the PLMN and network slice requested to be accessed in subsequent messages (for example, message 5 (Msg 5)) after the random access process.
  • the access network device performs the terminal
  • the access control will bring additional signaling overhead.
  • the terminal can indicate the information of the PLMN that it wants to access and the information of the network slice through the message in the random access process, so that the access network device can obtain this information earlier, and use some subsequent information.
  • the exchange of messages performs terminal access control, thereby reducing signaling overhead.
  • the first message may indicate the first PLMN and/or the first network slice in any of the following manners a to d.
  • the PLMN and/or network slice are indicated by the preamble set to which the preamble belongs.
  • the first message is message 1 or message A
  • message 1 and message A include a preamble
  • the preamble set to which the preamble belongs corresponds to the first PLMN and/or the first network slice.
  • the preamble set includes one or more preambles.
  • a preamble set is also a preamble group.
  • preambles which are divided into two parts, one part is used for contention access, and the other part is used for non-competition access.
  • the preamble used for competitive access is divided into A group and B group.
  • one network slice under one PLMN corresponds to one preamble set.
  • PLMN1 and PLMN2 and PLMN1 support 2 network slices, namely network slice 1 and network slice 2
  • PLMN2 supports 3 network slices, namely network slice 1, network slice 2 and network slice 3, and each network slice under each PLMN corresponds to See Table 9 for the preamble set.
  • one PLMN corresponds to one preamble set.
  • the preamble set corresponding to each PLMN can be referred to Table 10.
  • PLMN Preamble set PLMN1 1 PLMN2 3
  • one network slice corresponds to one preamble set. For example, if the network slices supported by the cell are network slice 1, network slice 2, and network slice 3, each network slice The corresponding preamble set can be seen in Table 11.
  • Network slicing Preamble set Network slice 1 1 Network slice 2 2 Network slice 3 3
  • the group can be further refined on the basis of the existing preamble grouping. For example, when the preamble set to which the preamble belongs corresponds to the PLMN, the group A preamble is based on the number of PLMNs.
  • the code is further divided, and each obtained preamble set corresponds to a PLMN, and can also be divided based on all the preambles. For example, when the preamble set to which the preamble belongs corresponds to the PLMN, all the preambles are based on the number of PLMNs.
  • the code is further divided, and each set of preambles obtained corresponds to a PLMN.
  • the first network slice may be indicated by other means.
  • the first PLMN may indicate in other ways.
  • the PLMN and/or network slice is indicated by a preset identifier.
  • the first message is message 3, and message 3 includes a preset identifier, and the preset identifier corresponds to the first PLMN and/or the first network slice.
  • message 3 may carry a preset identifier to indicate PLMN and/or network slice.
  • the corresponding relationship between the preset identifier and the PLMN and/or network slice may be broadcast to the terminal by the access network device.
  • the preset identifier may be allocated by the access network device or preset, and may also be determined in other ways, which is not limited in this application.
  • a network slice under a PLMN corresponds to a preset identifier.
  • PLMN1 supports 2 network slices, namely network slice 1 and network slice 2.
  • PLMN2 supports 3 network slices, namely network slice 1, network slice 2 and network slice 3.
  • the preset identifiers corresponding to each network slice under each PLMN can be See Table 12.
  • one PLMN corresponds to one preset identifier.
  • the preset identifiers corresponding to each PLMN can be referred to Table 13.
  • PLMN Preset logo PLMN1 1 PLMN2 3
  • a network slice corresponds to a preset identifier. For example, if the network slices supported by the cell are network slice 1, network slice 2, and network slice 3, the preset corresponding to each network slice Refer to Table 14 for identification.
  • the first network slice may be indicated in other ways.
  • the preset identifier in message 3 only corresponds to the first network slice the first PLMN may indicate it in other ways.
  • the first message includes the identity of the first PLMN and/or the identity of the first network slice.
  • the first message is message 1 or message 3 or message A.
  • the first message is message A, and the identification of the first PLMN and/or the identification of the first network slice is carried in the data payload.
  • the first network slice when the first message includes the identity of the first PLMN, the first network slice may be indicated in other ways.
  • the first PLMN may indicate it in other ways.
  • the PLMN and/or network slice is indicated by the PRACH resource, specifically, there are the following three cases (denoted as case (1), case (2), and case (3)).
  • step 1401 includes in specific implementation: the terminal uses the first PRACH resource to send the first message to the access network device, and the first The PRACH resource corresponds to the first network slice under the first PLMN.
  • the access network device receives the first message from the terminal on the first PRACH resource.
  • one network slice under one PLMN corresponds to one PRACH resource.
  • PLMN1 supports two The network slices are network slice 1 and network slice 2, respectively.
  • PLMN2 supports 3 network slices, namely network slice 1, network slice 2 and network slice 3.
  • the PRACH resources corresponding to each network slice under each PLMN can be seen in Table 15 .
  • the method further includes: the access network device broadcasts system information, and the system information includes PRACH resources corresponding to each network slice under multiple PLMNs.
  • the terminal receives the system information broadcast by the access network device from the access network device, and determines the PRACH resource corresponding to each network slice under multiple PLMNs according to the system information.
  • step 1401 includes in specific implementation: the terminal uses the second PRACH resource to send the first message to the access network device, and the second PRACH resource Corresponds to the first network slice.
  • the access network device receives the first message from the terminal on the second PRACH resource.
  • one network slice corresponds to one PRACH resource.
  • the PRACH resources corresponding to each network slice can be found in Table 16.
  • Network slicing PRACH resources Network slice 1 1 Network slice 2 2 Network slice 3 3
  • the first PLMN can be indicated in other ways. For example, it can be indicated by any one of the above methods a to c.
  • the method further includes: the access network device broadcasts system information, and the system information includes PRACH resources corresponding to each network slice in the communication system.
  • the terminal receives the system information broadcast by the access network device from the access network device, and determines the PRACH resource corresponding to each network slice in the communication system according to the system information.
  • step 1401 includes in specific implementation: the terminal uses the third PRACH resource to send the first message to the access network device, and the third PRACH resource is associated with Corresponding to the first PLMN.
  • the access network device receives the first message from the terminal on the third PRACH resource.
  • a PRACH resource corresponds to a PLMN
  • one PLMN corresponds to one PRACH resource.
  • the PRACH resources corresponding to each PLMN can be referred to Table 17.
  • the first network slice may be indicated in other ways. For example, it can be indicated by any one of the above methods a to c.
  • the method further includes: the access network device broadcasts system information, and the system information includes PRACH resources corresponding to multiple PLMNs.
  • the terminal receives the system information broadcast by the access network device from the access network device, and the system information includes PRACH resources corresponding to multiple PLMNs; the terminal determines the PRACH resources corresponding to the multiple PLMNs according to the system information.
  • the system information can be any system information in the existing system information, or any system information in the system information that will evolve in the future, which is not limited in this application.
  • the PRACH resources include PRACH time domain resources and frequency domain resources.
  • the time domain resource of PRACH can be indicated by the high-level parameter PRACH configuration index (prach-ConfigurationIndex), which can be obtained by querying Tables in 3GPP TS 38.211, 6.3.3.2-2-6.3.3.2-4, prach-ConfigurationIndex can indicate PRACH Format, period, period frame number, subframe number, start symbol, PRACH time slot, PRACH transmission opportunity in time slot and other information.
  • the frequency domain resources of PRACH are determined by the start resource block (resource block, RB), the number of used RBs, and the number of resource repetitions.
  • the start RB and the number of resource repetitions are determined by the high-level parameter message 1-FrequencyStart (msg1-FrequencyStart) and Message 1-Frequency-division multiplexing (FDM) (msg1-FDM) is determined, and the number of RBs is determined by Table 6.3.3.2-11 in 3GPP TS 38.211.
  • FDM Message 1-Frequency-division multiplexing
  • each network element such as a CU, DU, terminal, and access network device, includes a hardware structure and/or software module corresponding to each function.
  • the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software-driven hardware depends on the specific application and design constraint conditions of the technical solution. Professionals and technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered beyond the scope of this application.
  • the embodiments of the present application can divide functional units of CU, DU, terminal, and access network equipment according to the above method examples.
  • each functional unit can be divided corresponding to each function, or two or more functions can be integrated in One processing unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit. It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and there may be other division methods in actual implementation.
  • FIG. 15 shows a communication device 150 involved in the above-mentioned embodiment.
  • the communication device 150 may include a processing unit 1501 and a communication unit 1502.
  • the communication device 150 further includes a storage unit 1503.
  • the schematic structural diagram shown in FIG. 15 may be used to illustrate the structures of the CU, DU, terminal, and access network equipment involved in the foregoing embodiment.
  • the processing unit 1501 is used to control and manage the actions of the DU.
  • the processing unit 1501 is used to support the DU to execute the DU in FIG. 8 801 and 802, 801, 802, 11), 12), 13a), 14a) in Figure 8A, 901 to 906, 908 and 909 in Figure 9, and/or other processes described in the embodiments of the present application
  • the action performed by the DU may communicate with other network entities through the communication unit 1502, for example, communicate with the CU shown in FIG. 8.
  • the storage unit 1503 is used to store the program code and data of the DU.
  • the communication device 150 may be a device or a chip in the device.
  • the processing unit 1501 is used to control and manage the actions of the CU.
  • the processing unit 1501 is used to support the CU to execute the CU in FIG. 8 802 and 803, 802, 12), 13a), 15a), 13b) in Figure 8A, 902, 903, 906 to 910 in Figure 9, and/or CUs in other processes described in the embodiments of this application Action performed.
  • the processing unit 1501 may communicate with other network entities through the communication unit 1502, for example, communicate with the DU shown in FIG. 8.
  • the storage unit 1503 is used to store the program code and data of the CU.
  • the communication device 150 may be a device or a chip in the device.
  • the processing unit 1501 is used to control and manage the actions of the terminal.
  • the processing unit 1501 is used to support the terminal to execute the terminal shown in FIG. 9 901, 904, 905, and 909, 1002 and 1003 in Fig. 10, 1101 to 1104, 1108 in Fig. 11, 11) to 13) in Fig. 11A, 21) and 22) in Fig. 11B, and in Fig. 12
  • the processing unit 1501 may communicate with other network entities through the communication unit 1502, for example, communicate with the access network device shown in FIG. 11.
  • the storage unit 1503 is used to store the program code and data of the terminal.
  • the communication device 150 may be a device or a chip in the device.
  • the processing unit 1501 is used to control and manage the actions of the access network device, for example, the processing unit 1501 is used to support
  • the access network device executes 1001 and 1002 in FIG. 10, 1101, 1104 to 1106, 1108 in FIG. 11, 1401 and 1402 in FIG. 14, and/or access in other processes described in the embodiments of this application Action performed by the network device.
  • the processing unit 1501 may communicate with other network entities through the communication unit 1502, for example, communicate with the terminal shown in FIG. 11.
  • the storage unit 1503 is used to store the program code and data of the access network device.
  • the communication device 150 may be a device or a chip in the device.
  • the integrated unit in FIG. 15 is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the medium includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods in the various embodiments of the present application.
  • Storage media for storing computer software products include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks, etc., which can store program codes Medium.
  • the unit in FIG. 15 may also be referred to as a module, for example, the processing unit may be referred to as a processing module.
  • FIG. 16 is a schematic diagram of the hardware structure of a communication device 160 provided by an embodiment of the present application.
  • the communication device 160 includes one or more processors 1601 and a communication interface 1603.
  • the communication device 160 further includes a memory 1604.
  • the memory 1604 may include a read-only memory and a random access memory, and provides operation instructions and data to the processor 1601.
  • a part of the memory 1604 may also include a non-volatile random access memory (NVRAM).
  • NVRAM non-volatile random access memory
  • the communication device 160 executes the corresponding operation by calling the operation instruction stored in the memory 1604 (the operation instruction may be stored in the operating system).
  • the processor 1601 may also be referred to as a central processing unit (CPU).
  • CPU central processing unit
  • the processor 1601, the communication interface 1603, and the memory 1604 are coupled together through a bus system 1602, where the bus system 1602 may include a power bus, a control bus, and a status signal bus in addition to a data bus.
  • the bus system 1602 may include a power bus, a control bus, and a status signal bus in addition to a data bus.
  • various buses are marked as the bus system 1602 in FIG. 16.
  • the methods disclosed in the foregoing embodiments of the present application may be applied to the processor 1601 or implemented by the processor 1601.
  • the processor 1601 may be an integrated circuit chip with signal processing capabilities. In the implementation process, the steps of the foregoing method can be completed by an integrated logic circuit of hardware in the processor 1601 or instructions in the form of software.
  • the aforementioned processor 1601 may be a general-purpose processor, a digital signal processing (digital signal processing, DSP), an application specific integrated circuit (ASIC), a ready-made programmable gate array (field-programmable gate array, FPGA), or Other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • DSP digital signal processing
  • ASIC application specific integrated circuit
  • FPGA field-programmable gate array
  • Other programmable logic devices discrete gates or transistor logic devices, discrete hardware components.
  • the general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware decoding processor, or executed and completed by a combination of hardware and software modules in the decoding processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1604, and the processor 1601 reads the information in the memory 1604, and completes the steps of the foregoing method in combination with its hardware.
  • FIG. 16 may be used to illustrate the structures of the CU, DU, terminal, and access network equipment involved in the foregoing embodiment.
  • the processor 1601 is used to control and manage the actions of the DU.
  • the processor 1601 is used to support the DU to execute the DU in FIG. 8 801 and 802, 801, 802, 11), 12), 13a), 14a) in Figure 8A, 901 to 906, 908 and 909 in Figure 9, and/or other processes described in the embodiments of the present application
  • the action performed by the DU may communicate with other network entities through the communication interface 1603, for example, communicate with the CU shown in FIG. 8.
  • the memory 1604 is used to store the program code and data of the DU.
  • the processor 1601 is used to control and manage the actions of the CU.
  • the processor 1601 is used to support the CU to execute the CU in FIG. 8 802 and 803, 802, 12), 13a), 15a), 13b) in Figure 8A, 902, 903, 906 to 910 in Figure 9, and/or CUs in other processes described in the embodiments of this application Action performed.
  • the processor 1601 may communicate with other network entities through the communication interface 1603, for example, communicate with the DU shown in FIG. 8.
  • the memory 1604 is used to store the program code and data of the CU.
  • the processor 1601 is used to control and manage the actions of the terminal.
  • the processor 1601 is used to support the terminal to execute the terminal shown in FIG. 9 901, 904, 905, and 909, 1002 and 1003 in Fig. 10, 1101 to 1104, 1108 in Fig. 11, 11) to 13) in Fig. 11A, 21) and 22) in Fig. 11B, and in Fig. 12
  • the processor 1601 may communicate with other network entities through the communication interface 1603, for example, communicate with the access network device shown in FIG. 11.
  • the memory 1604 is used to store program codes and data of the terminal.
  • the processor 1601 is used to control and manage the actions of the access network device.
  • the processor 1601 is used to support
  • the access network device executes 1001 and 1002 in FIG. 10, 1101, 1104 to 1106, 1108 in FIG. 11, 1401 and 1402 in FIG. 14, and/or access in other processes described in the embodiments of this application Action performed by the network device.
  • the processor 1601 may communicate with other network entities through the communication interface 1603, for example, communicate with the terminal shown in FIG. 11.
  • the memory 1604 is used to store program codes and data of the access network device.
  • the above communication unit or communication interface may be an interface circuit or communication interface of the device for receiving signals from other devices.
  • the communication unit or communication interface is an interface circuit or communication interface used by the chip to receive signals or send signals from other chips or devices.
  • the instructions stored in the memory for execution by the processor may be implemented in the form of a computer program product.
  • the computer program product may be written in the memory in advance, or it may be downloaded and installed in the memory in the form of software.
  • the computer program product includes one or more computer instructions.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • Computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • computer instructions may be transmitted from a website, computer, server, or data center through a cable (such as Coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) to transmit to another website site, computer, server or data center.
  • a cable such as Coaxial cable, optical fiber, digital subscriber line (DSL)
  • wireless such as infrared, wireless, microwave, etc.
  • the computer-readable storage medium may be any available medium that can be stored by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk, SSD).
  • the embodiment of the present application further provides a computer-readable storage medium, which stores computer instructions; when the computer-readable storage medium runs on a computer, the computer is caused to execute the Apply for the communication method provided in the embodiment.
  • the embodiments of the present application also provide a computer program product containing computer instructions, which when running on a computer, enable the computer to execute the communication method provided in the embodiments of the present application.
  • An embodiment of the present application further provides a chip including a processor, and when the processor executes an instruction, the chip can execute the communication method provided in the embodiment of the present application.
  • the above embodiments it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • a software program it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on the computer, the processes or functions according to the embodiments of the present application are generated in whole or in part.
  • the computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • Computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium.
  • computer instructions can be transmitted from a website, computer, server, or data center through a cable (such as Coaxial cable, optical fiber, digital subscriber line (digital subscriber line, DSL)) or wireless (such as infrared, wireless, microwave, etc.) transmission to another website site, computer, server or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or includes one or more data storage devices such as a server or a data center that can be integrated with the medium.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, an SSD).

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Abstract

本申请提供一种通信方法及装置，涉及通信技术领域。该方法包括：DU获取DU的小区所支持的至少两个PLMN下的各个网络切片的资源占用信息，至少两个PLMN下的各个网络切片共享资源，DU向CU发送该资源占用信息，CU从DU接收并使用该资源占用信息，从而实现资源均衡。

Description

通信方法及装置 技术领域
本申请涉及通信技术领域，尤其涉及一种通信方法及装置。
背景技术
在某个国家或地区，某个运营商的某种制式的蜂窝移动通信网络被称为公共陆地移动网络(public land mobile network，PLMN)。PLMN是由政府或它所批准的经营者，为公众提供陆地移动通信业务目的而建立和经营的网络。PLMN可以与公共交换电话网络(public swithed telephone network，PSTN)等其他通信网络互联互通，形成整个地区或国家规模的通信网。
具体的，终端为了接入网络，在开机之后，会进行PLMN选择，以选择一个合适的PLMN进行通信。目前，终端仅根据PLMN的先验信息和小区的信号强度进行PLMN选择。而当一个小区支持多个PLMN，且多个PLMN下的所有的网络切片共享该小区的频谱资源和该小区所属的基站的硬件资源时，现有的PLMN选择机制可能会导致各个PLMN下的相同的网络切片间的资源分配不均。
发明内容
本申请实施例提供了一种通信方法及装置，用于实现资源均衡。
为达到上述目的，本申请提供了以下技术方案：
第一方面，提供了一种通信方法，包括：DU获取DU的小区所支持的至少两个PLMN下的各个网络切片的资源占用信息，并向CU发送资源占用信息。其中，至少两个PLMN下的各个网络切片共享资源。第一方面提供的方法，在接入网设备为DU和CU分离的形态时，DU可以将小区中的各个PLMN下的各个网络切片的资源占用信息发送给CU，从而使得CU可以使用资源占用信息，实现资源均衡。
在一种可能的实现方式中，该方法还包括：DU从终端接收请求信息，并向CU发送请求信息。其中，请求信息包括第一PLMN的标识和第一网络切片的标识，请求信息用于终端请求接入第一PLMN下的第一网络切片。该种可能的实现方式，DU可以将终端发送的请求信息发送给CU，以便CU获取终端请求的PLMN以及网络切片的信息。
在一种可能的实现方式中，该方法还包括：DU从CU接收释放信息，并向终端发送释放信息。其中，释放信息用于指示终端释放与CU之间的RRC连接。该种可能的实现方式，在CU不允许终端接入第一PLMN的第一网络切片的情况下，可以通过DU指示终端释放RRC连接，以便终端后续尽快的重新请求网络切片。
在一种可能的实现方式中，释放信息中包括释放原因，释放原因包括：第一PLMN下的第一网络切片的资源不足。该种可能的实现方式，可以使得终端根据释放RRC连接的原因确定进一步动作，例如，更换网络切片对应的PLMN，或者回退一定时间，再发起对应的网络切片服务请求。
在一种可能的实现方式中，资源占用信息用于CU确定是否允许终端接入第一PLMN下的第一网络切片。该种可能的实现方式，CU可以根据资源占用信息确定是否允许终端接入第一PLMN下的第一网络切片，从而可以基于资源占用信息对终端进行接入控制， 实现资源均衡。
第二方面，提供了一种通信装置，包括：处理单元和通信单元；处理单元，用于获取该通信装置的小区所支持的至少两个PLMN下的各个网络切片的资源占用信息，至少两个PLMN下的各个网络切片共享资源；通信单元，用于向CU发送资源占用信息。
在一种可能的实现方式中，通信单元，还用于从终端接收请求信息，并向CU发送请求信息；其中，请求信息包括第一PLMN的标识和第一网络切片的标识，请求信息用于终端请求接入第一PLMN下的第一网络切片。
在一种可能的实现方式中，通信单元，还用于从CU接收释放信息，并向终端发送释放信息；其中，释放信息用于指示终端释放与CU之间的RRC连接。
在一种可能的实现方式中，释放信息中包括释放原因，释放原因包括：第一PLMN下的第一网络切片的资源不足。
在一种可能的实现方式中，资源占用信息用于CU确定是否允许终端接入第一PLMN下的第一网络切片。
第三方面，提供了一种通信方法，包括：CU从DU接收DU的小区所支持的至少两个PLMN下的各个网络切片的资源占用信息，并使用资源占用信息。其中，至少两个PLMN下的各个网络切片共享资源。第三方面提供的方法，CU可以从DU接收资源占用信息，并且使用该资源占用信息，实现资源均衡。
在一种可能的实现方式中，该方法还包括：CU从DU接收请求信息，请求信息包括第一PLMN的标识和第一网络切片的标识，请求信息用于终端请求接入第一PLMN下的第一网络切片；CU使用资源占用信息，包括：在CU根据资源占用信息确定不允许终端接入第一PLMN下的第一网络切片、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息，释放信息用于指示终端释放与CU之间的RRC连接。该种可能的实现方式，在CU不允许终端接入第一PLMN的第一网络切片的情况下，可以通过DU指示终端释放RRC连接，以便终端后续尽快的重新请求网络切片。
在一种可能的实现方式中，在CU根据资源占用信息确定不允许终端接入第一PLMN下的第一网络切片、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息，包括：在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源占用率大于或等于阈值、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息。该种可能的实现方式，CU在第一PLMN下的第一网络切片的资源占用率大于或等于阈值的情况下，向DU发送释放信息，可以避免终端接入资源占用率较高的网络切片，实现资源均衡。
在一种可能的实现方式中，在CU根据资源占用信息确定不允许终端接入第一PLMN下的第一网络切片、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息，包括：在CU根据资源占用信息确定第一PLMN下的第一网络切片不是至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息。该种可能的实现方式，CU在第一PLMN下的第一网络切片不是至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片的情况下，向DU发送释放信息，可以避免终端接入资源占用率较高的网络切片，实现资源均衡。
在一种可能的实现方式中，在CU根据资源占用信息确定不允许终端接入第一PLMN下的第一网络切片、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息，包 括：在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源过载、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息。该种可能的实现方式，CU在第一PLMN下的第一网络切片的资源过载的情况下，向DU发送释放信息，可以避免终端接入资源过载的网络切片，实现资源均衡。
在一种可能的实现方式中，释放信息中包括释放原因，释放原因包括：第一PLMN下的第一网络切片的资源不足。该种可能的实现方式，可以使得终端根据释放RRC连接的原因确定进一步动作，例如，更换网络切片对应的PLMN，或者回退一定时间，再发起对应的网络切片服务请求。
在一种可能的实现方式中，该方法还包括：CU向第一PLMN中的AMF发送拒绝终端接入的原因，原因包括：第一PLMN下的第一网络切片的资源不足。该种可能的实现方式，可以使得第一PLMN中的AMF根据释放RRC连接的原因确定进一步的动作，例如，对过载的网络切片，或者，资源占用较多的网络切片进行过载控制。
第四方面，提供了一种通信装置，包括：处理单元和通信单元；通信单元，用于从DU接收DU的小区所支持的至少两个PLMN下的各个网络切片的资源占用信息，至少两个PLMN下的各个网络切片共享资源；处理单元，用于使用资源占用信息。
在一种可能的实现方式中，通信单元，还用于从DU接收请求信息，请求信息包括第一PLMN的标识和第一网络切片的标识，请求信息用于终端请求接入第一PLMN下的第一网络切片；处理单元，具体用于在该通信装置根据资源占用信息确定不允许终端接入第一PLMN下的第一网络切片、且终端与该通信装置建立RRC连接的情况下，通过通信单元向DU发送释放信息，释放信息用于指示终端释放与该通信装置之间的RRC连接。
在一种可能的实现方式中，处理单元，具体用于：在该通信装置根据资源占用信息确定第一PLMN下的第一网络切片的资源占用率大于或等于阈值、且终端与该通信装置建立RRC连接的情况下，通过通信单元向DU发送释放信息。
在一种可能的实现方式中，处理单元，具体用于：在该通信装置根据资源占用信息确定第一PLMN下的第一网络切片不是至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片、且终端与该通信装置建立RRC连接的情况下，通过通信单元向DU发送释放信息。
在一种可能的实现方式中，处理单元，具体用于：在该通信装置根据资源占用信息确定第一PLMN下的第一网络切片的资源过载、且终端与该通信装置建立RRC连接的情况下，通过通信单元向DU发送释放信息。
在一种可能的实现方式中，释放信息中包括释放原因，释放原因包括：第一PLMN下的第一网络切片的资源不足。
在一种可能的实现方式中，通信单元，还用于向第一PLMN中的AMF发送拒绝终端接入的原因，原因包括：第一PLMN下的第一网络切片的资源不足。
第五方面，提供了一种通信方法，包括：接入网设备获取所述接入网设备的小区的至少两个PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；所述接入网设备向所述终端发送所述资源占用信息。第五方面提供的方法，接入网设备可以向终端发送接入网设备的小区的至少两个PLMN下的各个网络 切片的资源占用信息，终端可以使用该资源占用信息，以实现资源均衡。
在一种可能的实现方式中，所述资源占用信息携带在系统信息中。该种可能的实现方式中，终端不需要与接入网设备建立RRC连接即可获取资源占用信息，从而可以较早的根据资源占用信息确定请求的网络切片。
第六方面，提供了一种通信装置，包括：处理单元和通信单元；所述处理单元，用于获取所述通信装置的小区的至少两个PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；所述通信单元，用于向所述终端发送所述资源占用信息。
在一种可能的实现方式中，所述资源占用信息携带在系统信息中。
第七方面，提供了一种通信方法，包括：终端从接入网设备接收资源占用信息，所述资源占用信息为所述接入网设备的小区的至少两个PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；所述终端使用所述资源占用信息。第七方面提供的方法，终端可以从接入网设备接收并使用资源占用信息，例如，可以基于资源占用信息请求网络切片，以实现资源均衡。
在一种可能的实现方式中，所述终端使用所述资源占用信息，包括：所述终端参考所述资源占用信息向所述接入网设备发送请求信息，所述请求信息包括第一PLMN的标识和第一网络切片的标识，所述请求信息用于请求接入所述第一PLMN下的所述第一网络切片。该种可能的实现方式，终端可以根据资源占用信息选择PLMN下的网络切片，从而可以避免选择资源占用率(或资源占用量)较高或资源过载的网络切片，实现资源均衡。
在一种可能的实现方式中，所述终端参考所述资源占用信息向所述接入网设备发送请求信息，包括：所述终端参考所述资源占用信息选择所述第一PLMN；所述终端向所述接入网设备发送请求信息。
在一种可能的实现方式中，所述终端参考所述资源占用信息选择所述第一PLMN，包括：所述终端确定PLMN的列表，所述列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值；所述终端根据所述列表中的PLMN对应的小区的信号强度由高至低的顺序依次进行判断，直至确定出满足第一条件的PLMN，其中，一个PLMN满足所述第一条件包括：该PLMN能够为所述终端提供所述第一网络切片、且该PLMN下的所述第一网络切片占用的所述资源满足第二条件；所述终端将所述满足所述第一条件的PLMN确定为所述第一PLMN。该种可能的实现方式，终端可以根据资源占用信息进行无先验信息的PLMN选择，从而可以避免选择资源占用率(或资源占用量)较高或资源过载的网络切片，实现资源均衡。
在一种可能的实现方式中，所述终端参考所述资源占用信息选择所述第一PLMN，包括：在所述终端维护的PLMN中存在满足第一条件的PLMN的情况下，所述终端确定满足所述第一条件的PLMN为所述第一PLMN；否则，所述终端确定PLMN的列表，并根据所述列表中的PLMN对应的小区的信号强度由高至低的顺序依次进行判断，直至确定出满足所述第一条件的PLMN，并将满足所述第一条件的PLMN确定为所述第一PLMN，所述列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值；其中，一个PLMN满足所述第一条件包括：该PLMN能够为所述终端提供所 述第一网络切片、且该PLMN下的所述第一网络切片占用的所述资源满足第二条件。该种可能的实现方式，终端可以根据资源占用信息进行有先验信息的PLMN选择，从而可以避免选择资源占用率(或资源占用量)较高或资源过载的网络切片，实现资源均衡。
在一种可能的实现方式中，一个PLMN下的所述第一网络切片占用的所述资源满足第二条件，包括：该PLMN下的所述第一网络切片的资源占用率小于或等于第二阈值；或者，该PLMN下的所述第一网络切片所占据的资源量小于或等于第三阈值；或者，该PLMN下的所述第一网络切片的资源未过载。
第八方面，提供了一种通信装置，包括：通信单元和处理单元；所述通信单元，用于从接入网设备接收资源占用信息，所述资源占用信息为所述接入网设备的小区的至少两个PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；所述处理单元，用于使用所述资源占用信息。
在一种可能的实现方式中，所述处理单元，具体用于：参考所述资源占用信息向所述接入网设备发送请求信息，所述请求信息包括第一PLMN的标识和第一网络切片的标识，所述请求信息用于请求接入所述第一PLMN下的所述第一网络切片。
在一种可能的实现方式中，所述处理单元，具体用于：参考所述资源占用信息选择所述第一PLMN；通过所述通信单元向所述接入网设备发送请求信息。
在一种可能的实现方式中，所述处理单元，具体用于：确定PLMN的列表，所述列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值；根据所述列表中的PLMN对应的小区的信号强度由高至低的顺序依次进行判断，直至确定出满足第一条件的PLMN，其中，一个PLMN满足所述第一条件包括：该PLMN能够为所述通信装置提供所述第一网络切片、且该PLMN下的所述第一网络切片占用的所述资源满足第二条件；将所述满足所述第一条件的PLMN确定为所述第一PLMN。
在一种可能的实现方式中，所述处理单元，具体用于：在所述通信装置维护的PLMN中存在满足第一条件的PLMN的情况下，确定满足所述第一条件的PLMN为所述第一PLMN；否则，确定PLMN的列表，并根据所述列表中的PLMN对应的小区的信号强度由高至低的顺序依次进行判断，直至确定出满足所述第一条件的PLMN，并将满足所述第一条件的PLMN确定为所述第一PLMN，所述列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值；其中，一个PLMN满足所述第一条件包括：该PLMN能够为所述通信装置提供所述第一网络切片、且该PLMN下的所述第一网络切片占用的所述资源满足第二条件。
在一种可能的实现方式中，一个PLMN下的所述第一网络切片占用的所述资源满足第二条件，包括：该PLMN下的所述第一网络切片的资源占用率小于或等于第二阈值；或者，该PLMN下的所述第一网络切片所占据的资源量小于或等于第三阈值；或者，该PLMN下的所述第一网络切片的资源未过载。
第九方面，提供了一种通信方法，包括：终端在接入网设备的小区向所述接入网设备发送第一消息，所述第一消息为随机接入过程中的消息，所述第一消息能够指示第一PLMN和/或第一网络切片，所述第一PLMN为所述终端希望接入的PLMN，所述第一网络切片为所述终端希望接入的网络切片；所述终端从所述接入网设备接收第一响应，所述第一响应中包括是否允许所述终端接入所述第一PLMN和/或所述第一网络切 片的信息。第九方面提供的方法，终端可以通过随机接入过程中的消息指示希望接入的PLMN的信息和网络切片的信息，从而可以使得接入网设备更早的获取到这些信息，利用后续的一些交互消息进行终端的接入控制，从而降低信令开销。
在一种可能的实现方式中，所述是否允许所述终端接入所述第一PLMN和/或所述第一网络切片的信息为所述接入网设备根据所述小区的至少两个PLMN下的各个网络切片的资源占用信息确定，所述至少两个PLMN下的各个网络切片共享资源。该种可能的实现方式，可以根据资源占用信息确定是否允许终端接入第一PLMN下的第一网络切片，从而可以基于资源占用信息对终端进行接入控制，实现资源均衡。
在一种可能的实现方式中，所述第一消息为消息1或消息3或消息A。
在一种可能的实现方式中，所述第一消息为消息1或消息A，所述消息1和所述消息A中包含前导码，所述前导码所属的前导码集合与所述第一PLMN和/或所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN和/或第一网络切片的方式。
在一种可能的实现方式中，所述第一消息为消息3，所述消息3中包括预设标识，所述预设标识与所述第一PLMN和/或所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN和/或第一网络切片的方式。
在一种可能的实现方式中，所述第一消息中包括所述第一PLMN的标识和/或所述第一网络切片的标识。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN和/或第一网络切片的方式。
在一种可能的实现方式中，所述第一消息为消息A，所述第一PLMN的标识和/或所述第一网络切片的标识携带在数据载荷中。
在一种可能的实现方式中，所述终端在接入网设备的小区向所述接入网设备发送第一消息，包括：所述终端采用第一PRACH资源向所述接入网设备发送所述第一消息，所述第一PRACH资源与所述第一PLMN下的所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN下的第一网络切片的方式。
在一种可能的实现方式中，所述方法还包括：所述终端从所述接入网设备接收所述接入网设备广播的系统信息，所述系统信息中包括所述多个PLMN下的各个网络切片对应的PRACH资源；所述终端根据所述系统信息确定所述多个PLMN下的网络切片对应的PRACH资源。该种可能的实现方式，可以使得终端获取多个PLMN下的网络切片与PRACH资源之间的对应关系。
在一种可能的实现方式中，所述终端在接入网设备的小区向所述接入网设备发送第一消息，包括：所述终端采用第二PRACH资源向所述接入网设备发送所述第一消息，所述第二PRACH资源与所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一网络切片的方式。
在一种可能的实现方式中，所述方法还包括：所述终端从所述接入网设备接收所述接入网设备广播的系统信息，所述系统信息中包括所述通信系统中的各个网络切片对应的PRACH资源；所述终端根据所述系统信息确定所述通信系统中的网络切片对应的PRACH资源。该种可能的实现方式，可以使得终端获取网络切片与PRACH资源之间 的对应关系。
在一种可能的实现方式中，所述终端在接入网设备的小区向所述接入网设备发送第一消息，包括：所述终端采用第三PRACH资源向所述接入网设备发送所述第一消息，所述第三PRACH资源与所述第一PLMN对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN的方式。
在一种可能的实现方式中，所述方法还包括：所述终端从所述接入网设备接收所述接入网设备广播的系统信息，所述系统信息中包括所述多个PLMN对应的PRACH资源；所述终端根据所述系统信息确定所述多个PLMN对应的PRACH资源。该种可能的实现方式，可以使得终端获取多个PLMN与PRACH资源之间的对应关系。
在一种可能的实现方式中，在不允许所述终端接入所述第一PLMN下的所述第一网络切片的情况下，所述第一响应中包括拒绝原因，所述拒绝原因包括：所述第一PLMN和/或所述第一网络切片的资源不足。该种可能的实现方式，可以使得终端获知被拒绝接入第一PLMN和/或第一网络切片的原因。第十方面，提供了一种通信装置，包括：处理单元和通信单元；所述处理单元，用于在接入网设备的小区通过所述通信单元向所述接入网设备发送第一消息，所述第一消息为随机接入过程中的消息，所述第一消息能够指示第一PLMN和/或第一网络切片，所述第一PLMN为所述通信装置希望接入的PLMN，所述第一网络切片为所述通信装置希望接入的网络切片；所述处理单元，还用于通过所述通信单元从所述接入网设备接收第一响应，所述第一响应中包括是否允许所述通信装置接入所述第一PLMN和/或所述第一网络切片的信息。
在一种可能的实现方式中，所述是否允许所述通信装置接入所述第一PLMN和/或所述第一网络切片的信息为所述接入网设备根据所述小区的至少两个PLMN下的各个网络切片的资源占用信息确定，所述至少两个PLMN下的各个网络切片共享资源。
在一种可能的实现方式中，所述第一消息为消息1或消息3或消息A。
在一种可能的实现方式中，所述第一消息为消息1或消息A，所述消息1和所述消息A中包含前导码，所述前导码所属的前导码集合与所述第一PLMN和/或所述第一网络切片对应。
在一种可能的实现方式中，所述第一消息为消息3，所述消息3中包括预设标识，所述预设标识与所述第一PLMN和/或所述第一网络切片对应。
在一种可能的实现方式中，所述第一消息中包括所述第一PLMN的标识和/或所述第一网络切片的标识。
在一种可能的实现方式中，所述第一消息为消息A，所述第一PLMN的标识和/或所述第一网络切片的标识携带在数据载荷中。
在一种可能的实现方式中，所述处理单元，具体用于通过所述通信单元采用第一PRACH资源向所述接入网设备发送所述第一消息，所述第一PRACH资源与所述第一PLMN下的所述第一网络切片对应。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元从所述接入网设备接收所述接入网设备广播的系统信息，所述系统信息中包括所述多个PLMN下的各个网络切片对应的PRACH资源；所述处理单元，还用于根据所述系统信息确定所述多个PLMN下的网络切片对应的PRACH资源。
在一种可能的实现方式中，所述处理单元，具体用于通过所述通信单元采用第二PRACH资源向所述接入网设备发送所述第一消息，所述第二PRACH资源与所述第一网络切片对应。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元从所述接入网设备接收所述接入网设备广播的系统信息，所述系统信息中包括所述通信系统中的各个网络切片对应的PRACH资源；所述处理单元，还用于根据所述系统信息确定所述通信系统中的网络切片对应的PRACH资源。
在一种可能的实现方式中，所述处理单元，具体用于通过所述通信单元采用第三PRACH资源向所述接入网设备发送所述第一消息，所述第三PRACH资源与所述第一PLMN对应。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元从所述接入网设备接收所述接入网设备广播的系统信息，所述系统信息中包括所述多个PLMN对应的PRACH资源；所述处理单元，还用于根据所述系统信息确定所述多个PLMN对应的PRACH资源。
在一种可能的实现方式中，在不允许所述通信装置接入所述第一PLMN下的所述第一网络切片的情况下，所述第一响应中包括拒绝原因，所述拒绝原因包括：所述第一PLMN和/或所述第一网络切片的资源不足。
第十一方面，提供了一种通信方法，包括：接入网设备在所述接入网设备的小区从终端接收第一消息，所述第一消息为随机接入过程中的消息，所述第一消息能够指示第一PLMN和/或第一网络切片，所述第一PLMN为所述终端希望接入的PLMN，所述第一网络切片为所述终端希望接入的网络切片；所述接入网设备向所述终端发送第一响应，所述第一响应中包括是否允许所述终端接入所述第一PLMN和/或所述第一网络切片的信息。第十一方面提供的方法，终端可以通过随机接入过程中的消息指示希望接入的PLMN的信息和网络切片的信息，从而可以使得接入网设备更早的获取到这些信息，利用后续的一些交互消息进行终端的接入控制，从而降低信令开销。
在一种可能的实现方式中，所述接入网设备向所述终端发送第一响应，包括：所述接入网设备根据所述小区的至少两个PLMN下的各个网络切片的资源占用信息向所述终端发送第一响应，所述至少两个PLMN下的各个网络切片共享资源。该种可能的实现方式，接入网设备可以根据资源占用信息确定是否允许终端接入第一PLMN下的第一网络切片，从而可以基于资源占用信息对终端进行接入控制，实现资源均衡。
在一种可能的实现方式中，所述第一消息为消息1或消息3或消息A。
在一种可能的实现方式中，所述第一消息为消息1或消息A，所述消息1和所述消息A中包含前导码，所述前导码所属的前导码集合与所述第一PLMN和/或所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN和/或第一网络切片的方式。
在一种可能的实现方式中，所述第一消息为消息3，所述消息3中包括预设标识，所述预设标识与所述第一PLMN和/或所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN和/或第一网络切片的方式。
在一种可能的实现方式中，所述第一消息中包括所述第一PLMN的标识和/或所述 第一网络切片的标识。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN和/或第一网络切片的方式。
在一种可能的实现方式中，所述第一消息为消息A，所述第一PLMN的标识和/或所述第一网络切片的标识携带在数据载荷中。
在一种可能的实现方式中，所述接入网设备在所述接入网设备的小区从终端接收第一消息，包括：所述接入网设备在第一PRACH资源上从所述终端接收所述第一消息，所述第一PRACH资源与所述第一PLMN下的所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN下的第一网络切片的方式。
在一种可能的实现方式中，所述方法还包括：所述接入网设备广播系统信息，所述系统信息中包括所述多个PLMN下的各个网络切片对应的PRACH资源。该种可能的实现方式，可以使得终端获取多个PLMN下的网络切片与PRACH资源之间的对应关系。
在一种可能的实现方式中，所述接入网设备在所述接入网设备的小区从终端接收第一消息，包括：所述接入网设备在第二PRACH资源上从所述终端接收所述第一消息，所述第二PRACH资源与所述第一网络切片对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一网络切片的方式。
在一种可能的实现方式中，所述方法还包括：所述接入网设备广播系统信息，所述系统信息中包括所述通信系统中的各个网络切片对应的PRACH资源。该种可能的实现方式，可以使得终端获取网络切片与PRACH资源之间的对应关系。
在一种可能的实现方式中，所述接入网设备在所述接入网设备的小区从终端接收第一消息，包括：所述接入网设备在第三PRACH资源上从所述终端接收所述第一消息，所述第三PRACH资源与所述第一PLMN对应。该种可能的实现方式，提供了一种使得接入网设备获知终端请求接入的第一PLMN的方式。
在一种可能的实现方式中，所述方法还包括：所述接入网设备广播系统信息，所述系统信息中包括所述多个PLMN对应的PRACH资源。该种可能的实现方式，可以使得终端获取多个PLMN与PRACH资源之间的对应关系。
在一种可能的实现方式中，在不允许所述终端接入所述第一PLMN和/或所述第一网络切片的情况下，所述第一响应中包括拒绝原因，所述拒绝原因包括：所述第一PLMN和/或所述第一网络切片的资源不足。该种可能的实现方式，可以使得终端获知被拒绝接入第一PLMN和/或第一网络切片的原因。
第十二方面，提供了一种通信装置，包括：通信单元和处理单元；所述处理单元，用于通过所述通信单元在所述通信装置的小区从终端接收第一消息，所述第一消息为随机接入过程中的消息，所述第一消息能够指示第一PLMN和/或第一网络切片，所述第一PLMN为所述终端希望接入的PLMN，所述第一网络切片为所述终端希望接入的网络切片；所述处理单元，还用于通过所述通信单元向所述终端发送第一响应，所述第一响应中包括是否允许所述终端接入所述第一PLMN和/或所述第一网络切片的信息。
在一种可能的实现方式中，所述处理单元，具体用于：根据所述小区的至少两个PLMN下的各个网络切片的资源占用信息，通过所述通信单元向所述终端发送第一响应，所述至少两个PLMN下的各个网络切片共享资源。
在一种可能的实现方式中，所述第一消息为消息1或消息3或消息A。
在一种可能的实现方式中，所述第一消息为消息1或消息A，所述消息1和所述消息A中包含前导码，所述前导码所属的前导码集合与所述第一PLMN和/或所述第一网络切片对应。
在一种可能的实现方式中，所述第一消息为消息3，所述消息3中包括预设标识，所述预设标识与所述第一PLMN和/或所述第一网络切片对应。
在一种可能的实现方式中，所述第一消息中包括所述第一PLMN的标识和/或所述第一网络切片的标识。
在一种可能的实现方式中，所述第一消息为消息A，所述第一PLMN的标识和/或所述第一网络切片的标识携带在数据载荷中。
在一种可能的实现方式中，所述处理单元，具体用于通过所述通信单元在第一PRACH资源上从所述终端接收所述第一消息，所述第一PRACH资源与所述第一PLMN下的所述第一网络切片对应。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元广播系统信息，所述系统信息中包括所述多个PLMN下的各个网络切片对应的PRACH资源。
在一种可能的实现方式中，所述处理单元，具体用于通过所述通信单元在第二PRACH资源上从所述终端接收所述第一消息，所述第二PRACH资源与所述第一网络切片对应。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元广播系统信息，所述系统信息中包括所述通信系统中的各个网络切片对应的PRACH资源。
在一种可能的实现方式中，所述处理单元，具体用于通过所述通信单元在第三PRACH资源上从所述终端接收所述第一消息，所述第三PRACH资源与所述第一PLMN对应。
在一种可能的实现方式中，所述处理单元，还用于通过所述通信单元广播系统信息，所述系统信息中包括所述多个PLMN对应的PRACH资源。
在一种可能的实现方式中，在不允许所述终端接入所述第一PLMN和/或所述第一网络切片的情况下，所述第一响应中包括拒绝原因，所述拒绝原因包括：所述第一PLMN和/或所述第一网络切片的资源不足。
第十三方面，提供了一种通信装置，该通信装置包括：存储器和处理器；可选的，还包括至少一个通信接口和通信总线；存储器用于存储计算机执行指令，处理器、存储器和至少一个通信接口通过通信总线连接，处理器执行存储器存储的计算机执行指令，以使通信装置实现第一方面、第三方面、第五方面、第七方面、第九方面和第十一方面中的任一方面提供的任意一种方法。该装置可以以芯片的产品形态存在。
第十四方面，提供了一种通信系统，包括第二方面和第四方面提供的通信装置；或者，第六方面和第八方面提供的通信装置；或者，第十方面和第十二方面提供的通信装置。
第十五方面，提供了一种计算机可读存储介质，包括指令，当其在计算机上运行时，使得计算机执行第一方面、第三方面、第五方面、第七方面、第九方面和第十一方面中的任一方面提供的任意一种方法。
第十六方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得 计算机执行第一方面、第三方面、第五方面、第七方面、第九方面和第十一方面中的任一方面提供的任意一种方法。
第十七方面，提供一种芯片，该芯片包括：处理器和接口，所述处理器通过所述接口与存储器耦合，当所述处理器执行所述存储器中的计算机程序或指令时，使得第一方面、第三方面、第五方面、第七方面、第九方面和第十一方面中的任一方面提供的任意一种方法被执行。
第二方面、第四方面、第六方面、第八方面、第十方面、第十二方面至第十七方面中的任一种设计方式所带来的技术效果可参见第一方面、第三方面、第五方面、第七方面、第九方面和第十一方面中对应设计方式所带来的技术效果，此处不再赘述。
其中，需要说明的是，上述各个方面中的任意一个方面的各种可能的实现方式，在方案不矛盾的前提下，均可以进行组合。
附图说明
图1为一种网络切片的架构示意图；
图2和图3分别为一种PLMN选择的流程图；
图4为4步随机接入过程的流程图；
图5为2步随机接入过程的流程图；
图6和图7分别为本申请实施例适用的一种网络架构图；
图8为本申请实施例提供的通信方法的流程图；
图8A为本申请实施例提供的通信方法的流程图；
图9至图11分别为本申请实施例提供的通信方法的流程图；
图11A为本申请实施例提供的PLMN选择的流程图；
图11B为本申请实施例提供的PLMN选择的流程图；
图12和图13分别为本申请实施例提供的一种PLMN选择的流程图；
图14为本申请实施例提供的一种通信方法的流程图；
图15为本申请实施例提供的一种通信装置的组成示意图；
图16为本申请实施例提供的一种通信装置的硬件结构示意图。
具体实施方式
在本申请的描述中，除非另有说明，“/”表示“或”的意思，例如，A/B可以表示A或B。本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。此外，“至少一个”是指一个或多个，“多个”是指两个或两个以上。“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。
需要说明的是，本申请中，“示例性的”或者“例如”等词用于表示作例子、例证或说明。本申请中被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其他实施例或设计方案更优选或更具优势。确切而言，使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念。
本申请涉及到的网元包括通信系统中的接入网设备和终端。
本申请实施例中的通信系统包括但不限于长期演进(long term evolution，LTE)系统、第五代(5th-generation，5G)系统、新无线(new radio，NR)系统，无线局域网 (wireless local area networks，WLAN)系统以及未来演进系统或者多种通信融合系统。示例性的，本申请实施例提供的方法具体可应用于演进的全球陆地无线接入网络(evolved-universal terrestrial radio access network，E-UTRAN)和下一代无线接入网(next generation-radio access network，NG-RAN)系统。
本申请实施例中的接入网设备为网络侧的一种用于发送信号，或者，接收信号，或者，发送信号和接收信号的实体。接入网设备可以为部署在无线接入网(radio access network，RAN)中为终端提供无线通信功能的装置，例如可以为传输接收点(transmission reception point，TRP)、基站、各种形式的控制节点(例如，网络控制器、无线控制器(例如，云无线接入网络(cloud radio access network，CRAN)场景下的无线控制器))、路侧单元(road side unit，RSU)等。具体的，接入网设备可以为各种形式的宏基站，微基站(也称为小站)，中继站，接入点(access point，AP)等，也可以为基站的天线面板。所述控制节点可以连接多个基站，并为所述多个基站覆盖下的多个终端配置资源。在采用不同的无线接入技术(radio access technology，RAT)的系统中，具备基站功能的设备的名称可能会有所不同。例如，LTE系统中可以称为演进型基站(evolved NodeB，eNB或eNodeB)，5G系统或NR系统中可以称为下一代基站节点(next generation node base station，gNB)，本申请对基站的具体名称不作限定。接入网设备还可以是未来演进的公共陆地移动网络(public land mobile network，PLMN)中的接入网设备等。
本申请实施例中的终端是用户侧的一种用于接收信号，或者，发送信号，或者，接收信号和发送信号的实体。终端用于向用户提供语音服务和数据连通性服务中的一种或多种。终端还可以称为用户设备(user equipment，UE)、终端设备、接入终端、用户单元、用户站、移动站、远方站、远程终端、移动设备、用户终端、无线通信设备、用户代理或用户装置。终端可以是车联网(vehicle to everything，V2X)设备，例如，智能汽车(smart car或intelligent car)、数字汽车(digital car)、无人汽车(unmanned car或driverless car或pilotless car或automobile)、自动汽车(self-driving car或autonomous car)、纯电动汽车(pure EV或Battery EV)、混合动力汽车(hybrid electric vehicle，HEV)、增程式电动汽车(range extended EV，REEV)、插电式混合动力汽车(plug-in HEV，PHEV)、新能源汽车(new energy vehicle)等。终端也可以是设备到设备(device to device，D2D)设备，例如，电表、水表等。终端还可以是移动站(mobile station，MS)、用户单元(subscriber unit)、无人机、物联网(internet of things，IoT)设备、WLAN中的站点(station，ST)、蜂窝电话(cellular phone)、智能电话(smart phone)、无绳电话、无线数据卡、平板型电脑、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字处理(personal digital assistant，PDA)设备、膝上型电脑(laptop computer)、机器类型通信(machine type communication，MTC)终端、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备(也可以称为穿戴式智能设备)。终端还可以为下一代通信系统中的终端，例如，5G系统中的终端或者未来演进的PLMN中的终端，NR系统中的终端等。
为了使得本申请更加的清楚，首先对本申请涉及到的部分概念或内容做简单介绍。
1、RAN共享(RAN Sharing)
运营商独立建网面临较多挑战，例如，高昂的频谱牌照费用，高昂的网络部署成本，短期内提供较高网络覆盖要求的压力等，为了应对上述挑战，提出了网络共享的概念，即RAN共享。RAN共享就是指RAN被多个运营商共享。
RAN共享主要包括3种形式，分别是共载频共享、分载频共享和混合载频共享。
其中，共载频共享是指多个运营商共享RAN资源，RAN资源包括小区频谱资源(例如，时域资源、频域资源等)和小区所属的接入网设备的硬件资源(例如，接入网设备的计算资源、接入网设备的存储资源等)。该情况下，多个运营商共享同一个小区，在该小区内广播多个PLMN的标识(PLMN ID)(包含一个主运营商的PLMN ID和多个从运营商的PLMN ID)。
分载频共享是指多个运营商共享接入网设备的硬件资源，但不共享频谱资源(即不共享小区)，该情况下，每个小区广播的PLMN ID只有一个，不同运营商使用的小区都是独立的，不存在小区空口资源共享使用的问题。
混合载频共享是指多个运营商共享接入网设备的硬件资源，共享或者独享小区频谱资源。该情况下，在一些小区内可能广播多个PLMN ID(包含一个主运营商的PLMN ID和多个从运营商的PLMN ID，不同小区的主运营商的PLMN ID可能不同)，在另一些小区内可能只广播一个PLMN ID。
本申请实施例提供的方法主要针对共载频共享和混合载频共享的场景中，具体应用于一个小区广播多个PLMN ID的情况，即本申请实施例中的小区上有多个PLMN。
2、网络切片
随着移动通信技术的发展，各类新业务以及应用场景不断涌现，这些业务对网络功能、连接性能及安全性等方面的需求存在很大的差别。如果利用单一网络去承载这些业务，将很难同时满足高带宽、低时延、高可靠性等需求。另外，为每种业务单独新建网络又会带来巨大的成本。这就要求5G网络在具备灵活、可拓展性的同时，能够满足不同的业务需求。为此，5G网络中通过端到端的网络切片(Network Slicing)为用户提供定制化的网络服务。
具体的，通过对网络资源的灵活分配、按需组网，5G网络在同一套物理设施上虚拟出多个具有不同特点且相互隔离的逻辑子网，来针对性地为用户提供服务。其中，一个逻辑子网即一个网络切片。
示例性的，参见图1，图1中示出了3个网络切片，分别为网络切片1、网络切片2和网络切片3，网络切片1、网络切片2和网络切片3可以分别是为增强移动宽带(enhanced mobile broadband，eMBB)业务、极可靠低延迟通信(ultra reliable low latency communications，URLLC)业务、海量机器类通信(massive machine type of communication，mMTC)业务服务的网络切片。
当终端发起一个网络切片请求时，接入网设备通过可以支持该网络切片的接入和移动管理功能(core access and mobility management function，AMF)选择支持该网络切片的会话管理功能(session management function，SMF)和网络存储功能(network repository function，NRF)，SMF进一步选择支持该网络切片的UPF，可选的，SMF还选择支持该网络切片的策略控制功能(policy control function，PCF)， 通过选择出的这些网元为终端提供该网络切片的服务。例如，当终端发起网络切片1的请求时，接入网设备通过可以支持网络切片1的AMF选择支持网络切片1的SMF和NRF，SMF进一步选择支持网络切片1的UPF，可选的，SMF还选择支持网络切片1的PCF，通过选择出的这些网元为终端提供网络切片1的服务。
不同的网络切片通过单网络切片选择支撑信息(single network slice selection assistance information,S-NSSAI)来标识和区分。每一个S-NSSAI可包括下列内容：
(1)切片/服务类型(slice/service type，SST)，指向网络切片特定的特征和业务类型；
(2)切片区分符(slice differentiator，SD)(是可选的)，作为SST的补充，可进一步区分满足相同SST的多个网络切片实例。
可选的，在本申请实施例中，网络切片的标识还可以为以下参数中的任意一种或多种：
(1)网络切片类型信息，例如，网络切片类型信息可以指示eMBB，URLLC，mMTC等网络切片类型，可选地，该网络切片类型信息还可以指示端到端的网络切片类型，包含RAN到核心网(core network，CN)的网络切片类型，也可以指RAN侧网络切片类型，或者CN侧网络切片类型；
(2)业务类型信息，与具体的业务相关，例如，该业务类型信息可以指示视频业务，车联网业务，语音业务等业务特征或者具体业务的信息。应理解，该业务类型信息与网络切片类型信息可以合并为一种信息；
[根据细则91更正 17.01.2020]　
(3)租户(Tenant)信息，用于指示创建或者租用该网络切片的客户信息，如公司A，公司B等；
(4)用户组信息，用于指示按照某种特征，如用户的级别等将用户进行分组的分组信息；
(5)切片组信息，用于指示按照某种特征，例如，可以将终端设备能够接入的所有网络切片作为一个切片组，或者也可以按照其他标准划分网络切片的分组；
(6)网络切片实例信息，用于指示为该网络切片创建的实例标识以及特征信息，例如，可以为网络切片实例分配一个标识，用于指示该网络切片实例，也可以在网络切片实例标识的基础上映射一个新的标识，关联该网络切片实例，接收方可以根据该标识识别出该标识指示的具体网络切片实例；
(7)专有核心网(dedicated core network，DCN)标识，该标识用于唯一指示LTE系统或者eLTE系统中的专有核心网，例如物联网专有的核心网，可选的，该DCN标识可以与网络切片标识做映射，由DCN标识可以映射出网络切片标识，通过网络切片标识也可以映射出DCN标识；
(8)网络切片区分(differentiator)，用于进一步区分网络切片的信息，可选地，两个或多个网络切片具有相同的网络切片类型和/或业务类型，但根据网络切片区分信息可以进一步区分所述两个或多个网络切片，也就是说，网络切片类型信息与网络切片区分可以用于标识一个网络切片。
应理解，在本申请实施例中，可以采用上述参数中的至少一种表示网络切片，例如，网络切片的标识可以用网络切片类型表征，或者也可以用网络切片类型和业务类 型表征，或者也可以用业务类型加租户信息表征等，本申请实施例对此不作限定。
3、现有的PLMN选择和小区选择
终端开机之后，终端的接入层(access stratum，AS)自动搜索网络，或者，终端的非接入层(non-access stratum，NAS)进行指定网络参数搜索，实现PLMN选择。
PLMN选择过程有两种，一种是终端在无先验信息的情况下的PLMN选择过程，另一种是终端存储有先验信息情况下的PLMN选择过程，两者的流程略微有些不同。在终端无先验信息的情况下，终端将进行全频段搜索，在每一个频点上搜索最强的小区报告给终端的NAS层，由NAS层来决定PLMN搜索是否继续进行，具体流程可参见图2。若终端存储有先验信息，则NAS层指示AS层按照先验信息的参数来进行PLMN搜索，并把结果上报给NAS层，具体流程可参见图3。图2和图3中的各个步骤的具体实现可参见现有技术，不再赘述。在图2和图3中，“USIM”是指全球用户识别卡(universal subscriber identity module)，“PCCPCH RSCP”是指主公共控制物理信道(primary common control physical channel，PCCPCH)接收信号码功率(received signal code power，RSCP)。
当PLMN选择过程结束后，NAS根据选择的PLMN，向AS指示进行指定PLMN的小区搜索过程。小区搜索过程分为两种情况，一种是终端无存储信息的初始小区搜索，此时终端需要进行全频段搜索，在每个频点上搜索最强的小区，当满足S准则后，即可以选择该小区进行驻留。另一种情况是终端存储有小区信息的小区搜索过程，此时终端只需在这些小区上进行搜索，搜到后判断是否满足S准则，当满足S准则后，终端便选择此小区进行驻留。
上述描述中，PLMN选择的输出结果是NAS获得了当前满足条件的PLMN信息，为小区选择做准备。小区选择的输出结果是找到了属于NAS选择的PLMN的合适的(SUITABLE)小区，并成功驻留，为下一步发起无线资源控制(radio resource control，RRC)连接或小区重选做准备。
4、系统信息
小区搜索过程之后，终端已经与小区取得下行同步。接着，终端需要获取到小区的系统信息(system information,SI)，这样才能知道该小区是如何配置的，以便接入该小区并在该小区内正常地工作。
LTE系统的系统信息主要分成：主信息块(master information block，MIB)、系统信息块(system information blocks，SIBs)、SIBs又分为26种类型：系统信息块类型1(system information block type1)到系统信息块类型26(system information block type26)，简称：SIB1,SIB2,…，SIB26。每个系统信息包含了与某个功能相关的一系列参数集合。其中，终端正常驻留以及发起随机接入必须获取的系统信息有：MIB、SIB1、SIB2。
NR系统信息主要分成MIB和SIBs，MIB和SIB1之外的SIBs叫其他系统信息(other system information，OSI)，SIBs又分为9种类型：系统信息块类型1(system information block type1)到系统信息块类型9(S system information block type9)，简称：SIB1,SIB2，……，SIB9。其中，终端正常驻留以及发起随机接入必须获取的系统信息有：MIB、SIB1。
5、现有的随机接入机制
在小区选择之后，终端可以通过随机接入过程与小区所属的接入网设备建立RRC连接。
随机接入过程用于终端与小区建立连接并获得上行同步。随机接入流程分为4步随机接入流程和2步随机接入流程。随机接入的种类分为两种：基于竞争和基于非竞争。
参见图4，图4示出了4步随机接入流程的示意图，基于竞争的随机接入过程包括以下步骤401至步骤404，基于非竞争的随机接入过程包括以下步骤401和步骤402。
401、终端向接入网设备发送消息1(Msg1)，消息1包括前导码。
其中，前导码也可以称为随机接入前导码、随机接入前导序列、前导序列等。
消息1可以告诉接入网设备有一个随机接入请求，同时使得接入网设备能估计其与终端之间的传输时延并以此确定时间提前量(timing advance，TA)。消息1可以承载在物理随机接入信道(physical random access channel，PRACH)上。
其中，基于竞争的随机接入，PRACH资源和前导码是由终端选择的，不同的终端可能同时选择同一个PRACH资源和同一个前导码，从而导致冲突的出现，这时就需要一个竞争解决机制(即步骤403和步骤404)来解决这个问题。
基于非竞争的随机接入，终端已经拥有在接入的小区内的唯一标识小区无线网络临时标识(cell-radio network temporary identifier，C-RNTI)，且PRACH资源和前导码是由接入网设备指定的，从而保证不会与其它终端发生冲突，也就不需要竞争解决机制(即不需要步骤403和步骤404)。
402、接入网设备向终端发送消息2(Msg2)。
其中，消息2可以是随机接入响应(random access response，RAR)。
其中，消息2中可以包括TA，该TA为接入网设备根据消息1为终端计算的TA。
403、终端向接入网设备发送消息3(Msg3)。
步骤403中，终端可以采用消息2中的TA向接入网设备发送消息3。
消息3中需要包含一个重要信息：终端的竞争解决标识(contention resolution ID)信息，该标识将用于步骤404的竞争解决。
404、接入网设备向终端发送消息4(Msg4)，指示终端随机接入的竞争结果。
其中，接入网设备在竞争解决机制中，会在消息4中携带终端的竞争解决标识以指定在竞争解决中成功的终端，其它没有在竞争解决中成功的终端将重新发起随机接入。
如图5所示，图5示出了2步随机接入流程的示意图，包括：
501、终端向接入网设备发送消息A(MsgA)。
其中，消息A包括随机接入信号和载荷数据，随机接入信号可以包括前导码和/或解调参考信号(demodulation reference signal,DMRS)，该随机接入信号用于载荷数据的接收，例如，可以根据该随机接入信号确定载荷数据的传输边界(比如传输载荷数据的时隙(slot)的起始位置和结束位置)或解调。该载荷数据可以为控制面数据和/或用户面数据，该载荷数据可以对应于前述4步随机接入机制中消息3中包含的内容。例如，该载荷数据可以包括RRC连接请求、终端的标识、调度请求、缓存状态报告(buffer status report,BSR)和真实的业务数据等中的任意一种。
502、接入网设备向终端发送消息B(MsgB)。
其中，消息B用于承载针对该随机接入信号和载荷数据的响应消息。该响应消息可以至少包括以下之一：C-RNTI的信息、定时提前命令(TA command)的信息、上行授权的信息、竞争解决标识信息等。其中，竞争解决标识可以为载荷数据的部分或者全部内容。此外，响应消息还包括控制面消息(也可以看作基于调度传输的应答消息)，例如，根据终端状态的不同和触发场景的不同，响应消息还可以包括以下之一：RRC连接(RRCSetup)消息、RRC重建立(RRCReestablishment)消息、RRC恢复(RRCResume)消息等。
本申请实施例提供的方法可以应用于图6和图7所示的网络架构中。
在图6中，接入网设备为一个完整的实体。接入网设备覆盖一个或多个小区(图6中以3个小区为例进行绘制)，终端(例如，图6中的终端1和终端2)可以在某个小区与接入网设备通信。
在图7中，接入网设备为集中式单元(centralized unit，CU)和分布式单元(distributed unit，DU)分离的形态。该情况下，接入网设备可包括CU、DU和有源天线单元(active antenna unit，AAU)。CU可以管理一个或多个DU(图7中以3个DU为例进行绘制)，每个DU可以覆盖一个或多个小区，例如，在图7中，DU1覆盖3个小区，DU2覆盖2个小区，DU3覆盖1个小区。终端(例如，图7中的终端1和终端2)可以在某个小区通过该小区所属的DU与CU通信。
其中，CU实现接入网设备的部分功能，DU实现接入网设备的部分功能。比如，CU负责处理非实时协议和服务，实现RRC层，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能。DU负责处理物理层协议和实时服务，实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层的功能。AAU实现部分物理层处理功能、射频处理及有源天线的相关功能。由于RRC层的信息最终会变成PHY层的信息，或者，由PHY层的信息转变而来，因而，在这种架构下，高层信令，如RRC层信令或PDCP层信令，也可以认为是由DU发送的，或者，由DU+AAU发送的。此外，CU可以划分为RAN中的网络设备，也可以将CU划分为核心网(core network，CN)中的网络设备，在此不做限制。
实施例一
实施例一适用于上述图7所示的网络架构。
实施例一提供了一种通信方法，可以应用于RAN共享场景中，用于面向网络切片对终端进行接入控制，以实现不同PLMN下相同的网络切片的资源均衡。参见图8，该通信方法包括：
801、DU获取DU的小区所支持的至少两个PLMN下的各个网络切片的资源占用信息，至少两个PLMN下的各个网络切片共享资源。
其中，DU的小区可以为DU覆盖的任意一个小区，本申请不作限制。
其中，一个网络切片的资源占用信息可以为该网络切片的资源占用率，也可以为该网络切片所占据的资源量，还可以是该网络切片是否过载的指示。其中，一个网络切片是否过载可以根据该网络切片的资源占用率和/或该网络切片所占据的资源量确 定。例如，当一个网络切片的资源占用率大于或等于一个阈值(记为阈值1)，和/或，该网络切片所占据的资源量大于或等于一个阈值(记为阈值2)时，认为该网络切片的资源过载。阈值1和阈值2可以为预设的或预定义的或协议规定的或接入网设备和终端协商确定的，本申请不作限制。
多个网络切片共享资源是指多个网络切片都可以使用该资源，但是该资源中的一部分资源一旦被一个网络切片使用后，其他网络切片便无法再使用这部分资源，只能使用该资源中的其他资源。上述至少两个PLMN下的各个网络切片共享的资源包括以下资源中的任意一种或多种：DU的硬件资源(包括DU的存储资源和/或DU的计算资源)、CU的硬件资源(包括CU的存储资源和/或CU的计算资源)、小区的频谱资源。
802、DU向CU发送资源占用信息，相应的，CU从DU接收资源占用信息。
可选的，资源占用信息可以携带在gNB-DU状态指示(gNB-DU status indication)消息中。
其中，DU向CU上报资源占用信息时，可以一个网络切片对应一个资源占用信息。
示例性的，以一个网络切片的资源占用信息为该网络切片的资源占用率为例，若小区支持2个PLMN，分别为PLMN1和PLMN2，PLMN1支持2个网络切片，分别为网络切片1和网络切片2，PLMN2支持3个网络切片，分别为网络切片1、网络切片2和网络切片3。PLMN1下的网络切片1的资源占用率为0.15，PLMN1下的网络切片2的资源占用率为0.08，PLMN2下的网络切片1的资源占用率为0.1，PLMN2下的网络切片2的资源占用率为0.1，PLMN2下的网络切片3的资源占用率为0.05，则DU向CU上报的资源占用信息可以如表1或表2所示。
表1
Figure PCTCN2019130985-appb-000001
表2
Figure PCTCN2019130985-appb-000002
DU向CU上报资源占用信息时，也可以多个网络切片对应一个资源占用信息，例如，针对资源占用信息相同的多个网络切片，该多个网络切片对应一个资源占用信息。该情况下，表1和表2中的信息在进行上报时可以是表3或表4中的形式。
表3
Figure PCTCN2019130985-appb-000003
Figure PCTCN2019130985-appb-000004
表4
Figure PCTCN2019130985-appb-000005
803、CU使用资源占用信息。
步骤803在具体实现时，CU可以根据资源占用信息对上述至少两个PLMN下的一个或多个网络切片进行接入控制。例如，若一个终端需要接入一个PLMN下的一个网络切片，CU可以根据资源占用信息确定是否允许该终端接入该PLMN下的该网络切片。
在RAN共享场景中，若一个小区上有多个PLMN，不同PLMN下的相同的网络切片的资源分配可能不均衡。例如，PLMN1和PLMN2共享RAN资源，PLMN1可以提供的网络切片包括网络切片1和网络切片2，PLMN2可以提供的网络切片服务包括网络切片1、网络切片2和网络切片3，当终端向网络发起网络切片1的服务请求时，PLMN1和PLMN2都可以向终端提供服务，但是，终端并不会根据网络切片1当前的资源占用情况，来选择PLMN为其服务，而是仅根据PLMN的先验信息和小区的信号强度进行PLMN选择，这就有可能导致PLMN1和PLMN2中的网络切片1的资源分配不均衡(例如，大运营商的网络切片1拥有更多的用户数)。本申请实施例提供的方法，在接入网设备为DU和CU分离的形态时，DU可以将小区中的各个PLMN下的各个网络切片的资源占用信息发送给CU，从而使得CU可以使用资源占用信息，实现资源均衡，避免不同PLMN下的相同的网络切片的资源分配不均衡。
当小区中的一个终端希望接入一个PLMN(记为第一PLMN，第一PLMN为上述至少两个PLMN中的任意一个PLMN)下的一个网络切片(记为第一网络切片，第一网络切片为第一PLMN下的任意一个网络切片)时，参见图8A，该方法还包括步骤11)和步骤12)：
11)终端向DU发送请求信息。相应的，DU从终端接收请求信息。
其中，请求信息包括第一PLMN的标识和第一网络切片的标识，请求信息用于终端请求接入第一PLMN下的第一网络切片。
步骤11)和上述步骤802的执行顺序不分先后。
其中，终端和DU之间的请求信息可以携带在RRC建立完成(RRCSetupComplete)消息中。
12)DU向CU发送请求信息。相应的，CU从DU接收请求信息。
其中，DU和CU之间的请求信息可以携带在gNB-DU状态指示消息中。
在步骤12)之后，步骤803的具体实现可以有以下两种情况(记为情况1和情况2)。
情况1
参见图8A，步骤803在具体实现时可以包括：13a)在CU根据资源占用信息确定不允许终端接入第一PLMN下的第一网络切片、且终端与CU建立RRC连接的情况下，CU向DU发送释放信息，释放信息用于指示终端释放与CU之间的RRC连接。相应的，DU从CU接收释放信息。
可选的，DU和CU之间的释放信息可以携带在下行RRC传输消息(DL RRC message transfer)中。
可选的，资源占用信息用于CU确定是否允许终端接入第一PLMN下的第一网络切片。
可选的，步骤13a)具体可以通过以下方式一至方式三中的任意一种方式实现。
方式一
在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源占用率大于或等于阈值的情况下，CU向DU发送释放信息。
在方式一中，阈值可以为预设的或预定义的或协议规定的或接入网设备和终端协商确定的，本申请不作限制。在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源占用率大于或等于阈值的情况下，CU不允许终端接入第一PLMN下的第一网络切片，因此，向DU发送释放信息。
其中，在本申请实施例中，一个网络切片的资源占用率可以仅通过网络切片的硬件资源占用率或频谱资源占用率表征，也可以通过硬件资源占用率和频谱资源占用率共同表征。若为后者，可以对硬件资源占用率和频谱资源占用率进行加权求和作为网络切片的资源占用率，也可以对硬件资源占用率和频谱资源占用率取平均作为网络切片的资源占用率，还可以通过其他计算方法得到网络切片的资源占用率，本申请不作限制。
类似的，网络切片的硬件资源占用率可以仅通过DU的存储资源的占用率、DU的计算资源的占用率、CU的存储资源的占用率或CU的计算资源的占用率表征，也可以通过其中的多个表征，与网络切片的资源占用率的表征方法是类似的，不再赘述。关于网络切片的资源占用率的该部分描述适用于该实施例的其他部分，也适用于其他实施例，下文中不再赘述。
示例性的，基于表1至表4中的任意一个表，若第一PLMN为PLMN1，第一网络切片为网络切片1，阈值为0.12，则由于PLMN1的网络切片1的资源占用率为0.15，0.15大于0.12，则CU向DU发送释放信息。
需要说明的是，若CU是根据资源占用量确定是否向DU发送释放信息时，将方式一中的资源占用率替换为资源占用量即可。
方式二
在CU根据资源占用信息确定第一PLMN下的第一网络切片不是上述至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片的情况下，CU向DU发送释放信息。
在CU根据资源占用信息确定第一PLMN下的第一网络切片不是上述至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片的情况下，CU不允许终端接入第一PLMN下的第一网络切片，因此，向DU发送释放信息。
示例性的，基于表1至表4中的任意一个表，若第一PLMN为PLMN1，第一网络切片为网络切片1，由于PLMN1的网络切片1的资源占用率为0.15，PLMN2的网络切片1的资源占用率为0.1，0.15不是0.1和0.15中的最小值，因此，CU向DU发送释放信息。
需要说明的是，若CU是根据资源占用量确定是否向DU发送释放信息时，将方式二中的资源占用率替换为资源占用量即可。
方式三
在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源过载的情况下，CU向DU发送释放信息。
在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源过载的情况下，CU不允许终端接入第一PLMN下的第一网络切片，因此，向DU发送释放信息。
示例性的，若小区支持2个PLMN，分别为PLMN1和PLMN2，PLMN1支持2个网络切片，分别为网络切片1和网络切片2，PLMN2支持3个网络切片，分别为网络切片1、网络切片2和网络切片3。各个网络切片的资源占用信息可参见表5或表6或表7或表8。若第一PLMN为PLMN1，第一网络切片为网络切片1，由于PLMN1下的网络切片1的资源过载，因此，CU向DU发送释放信息。
表5
Figure PCTCN2019130985-appb-000006
表6
Figure PCTCN2019130985-appb-000007
表7
Figure PCTCN2019130985-appb-000008
Figure PCTCN2019130985-appb-000009
表8
Figure PCTCN2019130985-appb-000010
可选的，释放信息中包括释放原因，释放原因包括：第一PLMN下的第一网络切片的资源不足。
在步骤13a)之后，参见图8A，该方法还可以包括步骤14a)：
14a)DU向终端发送释放信息。相应的，终端从DU接收释放信息。终端可以根据释放信息释放与CU之间的RRC连接。
可选的，终端和DU之间的释放信息可以携带在RRC释放(RRC release)消息中。
可选的，在步骤13a)之后，参见图8A，该方法还包括步骤15a)：
15a)CU向第一PLMN中的AMF发送拒绝终端接入的原因，原因包括：第一PLMN下的第一网络切片的资源不足。
步骤14a)和步骤15a)的执行顺序不分先后。
情况2
参见图8A，步骤803在具体实现时可以包括：13b)在CU根据资源占用信息确定允许终端接入第一PLMN下的第一网络切片的情况下，CU将请求信息发送给第一PLMN中的AMF。
可选的，在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源占用率(或资源占用量)小于阈值的情况下，或者，在CU根据资源占用信息确定第一PLMN下的第一网络切片是上述至少两个PLMN下的第一网络切片中的资源占用率(或资源占用量)最低的第一网络切片的情况下，或者，在CU根据资源占用信息确定第一PLMN下的第一网络切片的资源未过载的情况下，CU将请求信息发送给第一PLMN中的核心网设备。
为了使得实施例一提供的方法更加的清楚，以下通过图9对实施例一提供的方法作示例性说明，图9所示的过程包括：
901、终端在DU的小区向DU发送RRC建立请求(RRCSetupRequest)。
902、DU向CU发送初始上行RRC传输消息(initial UL RRC message transfer)。
903、CU向DU发送下行RRC传输消息(DL RRC message transfer)。
904、DU向终端发送RRC建立(RRC Setup)消息。
其中，步骤901至步骤904为终端的随机接入过程，用于终端与CU建立RRC连接。
905、终端向DU发送RRC建立完成(RRCSetupComplete)消息。
其中，RRC建立完成消息中包括请求信息，请求信息中包括第一PLMN的标识和第一网络切片的标识，请求信息可以用于终端请求接入第一PLMN中的第一网络切片。
906、DU向CU发送gNB-DU状态指示消息。
其中，gNB-DU状态指示消息中可以携带小区的至少两个PLMN下的各个网络切片的资源占用信息。例如，在gNB-DU状态指示消息中增加信元PLMN资源占用列表(PLMN Resource Occupation List)来携带上述资源占用信息。
需要说明的是，资源占用信息与DU和CU之间交互的其他信息的传输顺序没有强制要求，DU可以随时向CU发送资源占用信息。
907、CU根据资源占用信息确定是否允许终端接入第一PLMN下的第一网络切片。
步骤907的具体实现可参见上述方式一至方式三，在此不再赘述。
若是，在步骤907之后执行步骤908和步骤909，若否，在步骤907之后执行步骤910。
908、CU向DU发送下行RRC传输消息。
其中，下行RRC传输消息中包括释放信息，释放信息用于指示终端释放与CU之间的RRC连接。
可选的，该方法还包括：CU释放与终端之间的RRC连接。
909、DU向终端发送RRC释放消息。
其中，RRC释放消息中包括释放信息。
910、CU向第一PLMN中的AMF发送请求信息。
步骤910之后的后续流程可参见现有技术，在此不再赘述。
实施例一提供的方法中，终端在与CU建立RRC连接后，DU和CU可以通过交互获取当前小区的至少两个PLMN下的各个网络切片的资源占用信息，从而控制终端的接入，实现不同的PLMN下的相同的网络切片的资源的均匀分配。
实施例二
实施例二可以适用于上述图6和图7所示的网络架构，当然也可以适用于其他网络架构。针对图7，CU以及与CU连接的一个或多个DU组成实施例二中的接入网设备，在具体实现时，接入网设备所执行的动作可以由CU和DU协作执行(例如，CU和DU之间可以交互资源占用信息，具体过程可参见实施例一)，该情况下，实施例二中的小区即与CU连接的一个DU覆盖的小区。
实施例二提供了一种通信方法，可以应用于RAN共享场景中，接入网设备通过向终端发送接入网设备的小区的至少两个PLMN下的各个网络切片的资源占用信息，从而使得终端可以参考各个网络切片的资源占用信息进行PLMN选择，实现不同的PLMN下的相同的网络切片的资源的均匀分配。参见图10，该通信方法包括：
1001、接入网设备获取接入网设备的小区的至少两个PLMN下的各个网络切片的资源占用信息，至少两个PLMN下的各个网络切片共享资源。
其中，步骤1001为一个可选的步骤。
其中，接入网设备的小区可以为接入网设备覆盖的任意一个小区，本申请不作限制。
关于网络切片的资源占用信息的描述以及多个网络切片共享资源的描述可以参见实施例一，在实施例二中不再赘述。与实施例一不同的是，此处的至少两个PLMN下的各个网络切片共享的资源包括以下资源中的任意一种或多种：接入网设备的硬件资源(包括接入网设备的存储资源和/或接入网设备的计算资源)、小区的频谱资源。
1002、接入网设备向终端发送资源占用信息。相应的，终端从接入网设备接收资源占用信息。
其中，步骤1002在具体实现时，接入网设备可以向终端发送包括资源占用信息的RRC消息，也可以广播包括资源占用信息的系统信息，终端在接收到系统信息之后可以解码该系统信息，获取资源占用信息。
其中，系统信息可以为现有系统信息中的任意一个系统信息，还可以是未来演进的系统信息中的任意一个系统信息，本申请不作限制。示例性的，可以在SIB1中的小区接入相关信息(cellAccessRelatedInfo)信元中添加资源占用信息。
接入网设备向终端发送资源占用信息时，可以一个网络切片对应一个资源占用信息，例如上述表1或表2或表5或表6所示的示例，也可以多个网络切片对应一个资源占用信息，例如，上述表3或表4或表7或表8所示的示例。
1003、终端使用资源占用信息。
步骤1003在具体实现时，终端可以根据上述资源占用信息确定是否请求接入某个PLMN下的某个网络切片。
本申请实施例提供的方法，接入网设备可以向终端发送接入网设备的小区的至少两个PLMN下的各个网络切片的资源占用信息，终端可以使用该资源占用信息，以实现资源均衡。例如，目前，系统信息中不包含小区的各PLMN下的网络切片的资源占用信息，无法为终端选择PLMN并请求相应的网络切片服务提供参考信息，可能导致不同PLMN下的相同的网络切片的资源分配不均衡，而本申请实施例中，可以在系统信息中增加资源占用信息，从而为终端选择PLMN并请求相应的网络切片服务提供参考，避免不同PLMN下的相同的网络切片的资源分配不均衡。
可选的，步骤1003在具体实现时包括：
1003a、终端参考资源占用信息向接入网设备发送请求信息，请求信息包括第一PLMN的标识和第一网络切片的标识，请求信息用于请求接入第一PLMN下的第一网络切片。
可选的，请求信息可以携带在消息5中。
可选的，步骤1003a在具体实现时包括：
1003a-1)终端参考资源占用信息选择第一PLMN。
1003a-2)终端向接入网设备发送请求信息。
在步骤1003a-2)之前，终端还可以选择第一网络切片，具体可以根据终端的业务需求选择。
在步骤1003a之后，接入网设备接收携带请求信息的消息(例如，请求信息可以携带在该消息的消息头中)，根据该消息确定终端请求接入的PLMN为第一PLMN，并将该消息发送给第一PLMN中的核心网设备，核心网设备接收到该消息后，决定是否允许终端接入，并向终端发送接入接受消息或接入拒绝消息。一种示例性的流程可参见图11，包括：
1101、接入网设备向终端发送系统信息，系统信息中包括资源占用信息。
1102、终端解码系统信息，获取资源占用信息。
1103、终端参考资源占用信息选择第一网络切片和第一PLMN。
1104、终端向接入网设备发送携带请求信息的消息。
1105、接入网设备根据携带请求信息的消息确定终端请求接入的PLMN为第一PLMN。
1106、接入网设备向第一PLMN中的核心网设备(例如，AMF)发送携带请求信息的消息。
1107、第一PLMN中的核心网设备决定是否允许终端接入。
1108、第一PLMN中的核心网设备向终端发送接入接受消息或接入拒绝消息。
可以理解的是，在第一PLMN中的核心网设备决定允许终端接入第一PLMN的第一网络切片的情况下，第一PLMN中的核心网设备向终端发送接入接受消息，否则，第一PLMN中的核心网设备向终端发送接入拒绝消息。
其中，步骤1003a-1)可以通过以下方式1或方式2实现。
方式1
参见图11A，方式1包括步骤11)至步骤13)：
11)终端确定PLMN的列表，列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值。
需要说明的是，一个PLMN对应一个小区，但是一个小区可以对应多个PLMN。
其中，第一阈值可以为预设的或预定义的或协议规定的或接入网设备和终端协商确定的，本申请不作限制。
12)终端根据列表中的PLMN对应的小区的信号强度由高至低的顺序依次进行判断，直至确定出满足第一条件的PLMN，其中，一个PLMN满足第一条件包括：该PLMN能够为终端提供第一网络切片、且该PLMN下的第一网络切片占用的资源满足第二条件。
步骤12)具体实现时，终端可以按照列表中的PLMN对应的小区的信号强度由高至低的顺序依次对PLMN进行排序，然后按照排序结果从前至后依次判断PLMN是否满足第一条件。
可选的，一个PLMN下的第一网络切片占用的资源满足第二条件，包括：该PLMN下的第一网络切片的资源占用率小于或等于第二阈值；或者，该PLMN下的第一网络切片所占据的资源量小于或等于第三阈值；或者，该PLMN下的第一网络切片的资源未过载。
其中，第二阈值和/或第三阈值可以为预设的或预定义的或协议规定的或接入网设备和终端协商确定的，本申请不作限制。
13)终端将满足第一条件的PLMN确定为第一PLMN。
示例性的，若PLMN的列表中包括3个PLMN，分别为PLMN1、PLMN2和PLMN3，3个PLMN均可以提供第一网络切片，PLMN1、PLMN2和PLMN3下的第一网络切片对应的资源占用率分别为0.2、0.15、0.3，3个PLMN对应的小区的信号强度由高至低分别为PLMN3、PLMN2、PLMN1，第二阈值为0.2，则终端可以先判断PLMN3下的第一网络切片对应的资源占用率是否小于或等于0.2，结果为否，则终端不选择PLMN3作为第一PLMN，终端接着判断PLMN2下的第一网络切片对应的资源占用率是否小于或等于0.2，结果为是，因此，终端确定PLMN2为第一PLMN。
基于方式1，终端进行PLMN选择的一种示例性的流程可以参见图12，包括：
1201、终端接收接入网设备在接入网设备的小区广播的系统信息，并获取系统信 息中的资源占用信息。
1202、终端确定PLMN的列表，列表中的PLMN按照PLMN对应的小区的信号强度由强至弱的顺序依次排序。
1203、终端判断列表中的第i个PLMN是否满足第一条件，i的初始值为1。
若是，执行步骤1204，若否，令i＝i+1，并返回步骤1203。
1204、终端确定第i个PLMN为第一PLMN。
其中，步骤1201可以与图2中的步骤“读取系统信息获得PLMN ID”同时执行，图12中的步骤1202至步骤1204可以在图2中的步骤“NAS层指示停止搜索PLMN”之后执行。
方式1适用于无先验信息的PLMN选择。
方式2
参见图11B，方式2包括步骤21)和步骤22)：
21)在终端维护的PLMN中存在满足第一条件的PLMN的情况下，终端确定满足第一条件的PLMN为第一PLMN；否则，终端确定PLMN的列表。
22)终端根据列表中的PLMN对应的小区的信号强度由高至低的顺序依次进行判断，直至确定出满足第一条件的PLMN，并将满足第一条件的PLMN确定为第一PLMN，列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值。
其中，一个PLMN满足第一条件包括：该PLMN能够为终端提供第一网络切片、且该PLMN下的第一网络切片占用的资源满足第二条件。关于该部分的描述可参见方式1，不再赘述。
其中，终端维护的PLMN可以存储在终端中。终端维护的PLMN包括RPLMN、EPLMN、HPLMN、EHPLMN中的一个或多个，在判断终端维护的PLMN中是否存在满足第一条件的PLMN时，也是按照RPLMN、EPLMN、HPLMN、EHPLMN的顺序判断的，例如，若终端维护的PLMN包括RPLMN和HPLMN，则在判断终端维护的PLMN中是否存在满足第一条件的PLMN时，先判断RPLMN是否满足第一条件，再判断HPLMN是否满足第一条件。
其中，RPLMN是指注册PLMN(Rigistered PLMN)，即终端上次成功注册过的PLMN，该PLMN ID保存在终端的内存中。EPLMN是指等效PLMN(Equivalent PLMN)，即当前已选择的PLMN的等效PLMN，即RPLMN的等效PLMN，该PLMN保存在终端的内存中。HPLMN是指归属PLMN(Home PLMN)，即USIM卡的归属PLMN，其代表发放该USIM卡的PLMN。Home PLMN的PLMN ID是从USIM卡的国际移动用户识别码(international mobile subscriber identity，IMSI)号获取的(IMSI号前几位即Home PLMN ID)。EHPLMN是指等效归属PLMN(Equivalent Home PLMN)，即USIM卡归属PLMN的等效PLMN，也就是与归属PLMN完全等同对待的PLMN。EHPLMN的PLMN ID保存在USIM卡的“EHPLMN List”表中，并按优先顺序从高到低排列的(优先最高的排在第一位)，终端进行PLMN选择时也是按优先级从高到低依次选择。
示例性的，若终端维护的PLMN包括RPLMN和HPLMN，RPLMN和HPLMN均可以提供第一网络切片，并且RPLMN和HPLMN下的第一网络切片对应的资源占用率分别为0.1、0.1，第二阈值为0.2，则终端先判断RPLMN下的第一网络切片对应的资源占用率是否小于或等于0.2，结果为否，接着判断HPLMN下的第一网络切片对应的资源占用率是 否小于或等于0.2，结果也为否，则终端确定PLMN的列表，若PLMN的列表包括PLMN1、PLMN2和PLMN3，PLMN1、PLMN2和PLMN3均可以提供第一网络切片，并且PLMN1、PLMN2和PLMN3下的第一网络切片对应的资源占用率分别为0.2、0.15、0.3，PLMN的列表对应的小区的信号强度由高至低分别为PLMN3、PLMN2、PLMN1，则终端判断PLMN3下的第一网络切片对应的资源占用率是否小于或等于0.2，结果也为否，接着判断PLMN2下的第一网络切片对应的资源占用率是否小于或等于0.2，结果为是，因此，终端确定PLMN2为第一PLMN。
基于方式2，假设终端维护的PLMN包括RPLMN、EPLMN、HPLMN和EHPLMN，终端进行PLMN选择的流程可以参见图13，包括：
1301、终端接收接入网设备在接入网设备的小区广播的系统信息，并获取系统信息中的资源占用信息。
1302、终端按照RPLMN、EPLMN、HPLMN、EHPLMN的顺序对PLMN依次进行排序，得到第一列表。
其中，EPLMN可以包括多个PLMN，EHPLMN也可以包括多个PLMN。本申请实施例中假设第一列表中的PLMN的个数为M。
1303、终端判断第一列表中的第i个PLMN是否满足第一条件，i的初始值为1。
若是，执行步骤1304；若否，判断i是否等于M，若是，执行步骤1305，若否，令i＝i+1，并返回步骤1303。
1304、终端确定第i个PLMN为第一PLMN。
1305、终端确定PLMN的第二列表，第二列表中的PLMN按照PLMN对应的小区的信号强度由强至弱的顺序依次排序。
其中，第二列表中的一个PLMN对应一个小区，一个PLMN对应的小区的信号强度大于或等于第一阈值。
1306、终端判断第二列表中的第j个PLMN是否满足第一条件，j的初始值为1。
若是，执行步骤1307，若否，令j＝j+1，并返回步骤1306。
1307、终端确定第j个PLMN为第一PLMN。
其中，步骤1301可以与图3中的步骤“读取系统信息获得PLMN ID”同时执行，图13中的步骤1302至步骤1307可以在图3中的步骤“NAS层指示停止搜索PLMN”之后执行。
方式2适用于有先验信息的PLMN选择。
在本申请实施例中，例如，上述方式1和方式2中，针对RAN共享场景，终端在现有PLMN选择原则中考虑了各PLMN下的网络切片的资源占用信息，使得终端尽可能选择资源占用较少的网络切片所属的PLMN，从而可以实现资源均衡。
实施例三
实施例三可以适用于上述图6和图7所示的网络架构，当然也可以适用于其他网络架构。针对图7，CU以及与CU连接的一个或多个DU组成实施例三中的接入网设备，在具体实现时，接入网设备所执行的动作可以由CU和DU协作执行(例如，CU和DU之间可以交互资源占用信息，具体过程可参见实施例一)，该情况下，实施例三中的小区即与CU连接的一个DU覆盖的小区。
实施例三提供了一种通信方法，终端通过随机接入过程中的消息指示所请求的PLMN和网络切片，从而避免上述问题3。另外，实施例三还可以应用于RAN共享场景中，接入网设备可以根据小区的至少两个PLMN下的各个网络切片的资源占用信息，对终端进行接入控制，从而实现不同的PLMN下的相同的网络切片的资源的均匀分配。参见图14，该通信方法包括：
1401、终端在接入网设备的小区向接入网设备发送第一消息。相应的，接入网设备在接入网设备的小区从终端接收第一消息。
其中，第一消息为随机接入过程中的消息。可选的，第一消息为消息1或消息3或消息A。
第一消息能够指示第一PLMN和/或第一网络切片，其中，第一PLMN为终端希望接入的PLMN，第一网络切片为终端希望接入的网络切片。
其中，接入网设备的小区可以为接入网设备覆盖的任意一个小区，本申请不作限制。
1402、接入网设备向终端发送第一响应。相应的，终端从接入网设备接收第一响应。
其中，第一响应中包括是否允许终端接入第一PLMN和/或第一网络切片的信息。
当第一消息为消息1时，第一响应为消息2，当第一消息为消息3时，第一响应为消息4，当第一消息为消息A时，第一响应为消息B。
需要说明的是，步骤1402是可选步骤，该情况下，若终端发送第一消息之后，在一定的时间段内未收到接入网设备的第一响应，则认为不允许接入第一PLMN和/或第一网络切片。
可选的，步骤1402在具体实现时，包括：
1402a、接入网设备根据小区的至少两个PLMN下的各个网络切片的资源占用信息向终端发送第一响应，至少两个PLMN下的各个网络切片共享资源。
步骤1402a在具体实现时，接入网设备可以采用上述实施例一中的方式一至方式三中的任意一种方式确定是否允许终端接入第一PLMN和/或第一网络切片，确定之后将确定结果携带在第一响应中向终端发送，从而可以实现不同的PLMN下的相同的网络切片的资源的均匀分配。区别仅在于，此处是由接入网设备确定的，并且若确定是否允许终端接入第一PLMN，则根据第一PLMN的资源占用信息(例如，第一PLMN的资源占用率，资源占用量，资源是否过载等信息)确定即可。
关于网络切片的资源占用信息的描述以及多个网络切片共享资源的描述可以参见实施例一，在实施例三中不再赘述。与实施例一不同的是，此处的至少两个PLMN下的各个网络切片共享的资源包括以下资源中的任意一种或多种：接入网设备的硬件资源(包括接入网设备的存储资源和/或接入网设备的计算资源)、小区的频谱资源。
可选的，在不允许终端接入第一PLMN和/或第一网络切片的情况下，第一响应中包括拒绝原因，拒绝原因包括：第一PLMN和/或第一网络切片的资源不足。
目前，终端是在随机接入过程之后，才会在后续的消息(例如，消息5(Msg 5))中携带请求接入的PLMN和网络切片的标识，此时，接入网设备再进行终端的接入控制会带来额外的信令开销。实施例三提供的方法，终端可以通过随机接入过程中的消息 指示希望接入的PLMN的信息和网络切片的信息，从而可以使得接入网设备更早的获取到这些信息，利用后续的一些交互消息进行终端的接入控制，从而降低信令开销。
其中，第一消息可以通过以下方式a至方式d中的任意一种方式指示第一PLMN和/或第一网络切片。
方式a
在方式a中，通过前导码所属的前导码集合指示PLMN和/或网络切片。
该情况下，第一消息为消息1或消息A，消息1和消息A中包含前导码，该前导码所属的前导码集合与第一PLMN和/或第一网络切片对应。
其中，前导码集合中包括一个或多个前导码。一个前导码集合也就是一个前导码组。
需要说明的是，现有的通信协议中，前导码有64个，分为两大部分，一部分用于竞争接入，另一部分用于非竞争接入。其中，用于竞争接入的前导码又分为A组和B组。当终端需要传输的消息3大小较小时，选择A组(隐式的指定了无线信道质量较差)，当终端需要传输的消息3大小较大时，选择B组(隐式的指定了无线信道质量较好)。
在本申请实施例中，当前导码所属的前导码集合与PLMN和网络切片对应时，一个PLMN下的一个网络切片与一个前导码集合对应，例如，若小区支持2个PLMN，分别为PLMN1和PLMN2，PLMN1支持2个网络切片，分别为网络切片1和网络切片2，PLMN2支持3个网络切片，分别为网络切片1、网络切片2和网络切片3，则各个PLMN下的各个网络切片对应的前导码集合可以参见表9。
表9
Figure PCTCN2019130985-appb-000011
当前导码所属的前导码集合与PLMN对应时，一个PLMN与一个前导码集合对应，例如，若小区支持2个PLMN，分别为PLMN1和PLMN2，则各个PLMN对应的前导码集合可以参见表10。
表10
PLMN 前导码集合
PLMN1 1
PLMN2 3
当前导码所属的前导码集合与网络切片对应时，一个网络切片与一个前导码集合对应，例如，若小区支持的网络切片分别为网络切片1、网络切片2和网络切片3，则各个网络切片对应的前导码集合可以参见表11。
表11
网络切片 前导码集合
网络切片1 1
网络切片2 2
网络切片3 3
本申请在对前导码进行分组时，可以在现有前导码分组的基础上，进一步的进行细化分组，例如，前导码所属的前导码集合与PLMN对应时，基于PLMN个数对A组前导码进行进一步的划分，得到的每个前导码集合对应一个PLMN，也可以基于全部的前导码重新进行划分，例如，前导码所属的前导码集合与PLMN对应时，基于PLMN个数对全部的前导码进行进一步的划分，得到的每个前导码集合对应一个PLMN。
在方式a中，当消息1和消息A中的前导码所属的前导码集合仅与第一PLMN对应时，第一网络切片可以通过其他方式指示。当消息1和消息A中的前导码所属的前导码集合仅与第一网络切片对应时，第一PLMN可以通过其他方式指示。
方式b
在方式b中，通过预设标识指示PLMN和/或网络切片。
该情况下，第一消息为消息3，消息3中包括预设标识，该预设标识与第一PLMN和/或第一网络切片对应。
需要说明的是，受限于消息3的大小(48比特)，消息3中可以携带预设标识，以指示PLMN和/或网络切片。预设标识与PLMN和/或网络切片之间的对应关系可以是接入网设备广播给终端的。预设标识可以是接入网设备分配的或预先设置的，还可以为其他方式确定的，本申请不作限制。
在本申请实施例中，当预设标识与PLMN和网络切片对应时，一个PLMN下的一个网络切片与一个预设标识对应，例如，若小区支持2个PLMN，分别为PLMN1和PLMN2，PLMN1支持2个网络切片，分别为网络切片1和网络切片2，PLMN2支持3个网络切片，分别为网络切片1、网络切片2和网络切片3，则各个PLMN下的各个网络切片对应的预设标识可以参见表12。
表12
Figure PCTCN2019130985-appb-000012
当预设标识与PLMN对应时，一个PLMN与一个预设标识对应，例如，若小区支持2个PLMN，分别为PLMN1和PLMN2，则各个PLMN对应的预设标识可以参见表13。
表13
PLMN 预设标识
PLMN1 1
PLMN2 3
当预设标识与网络切片对应时，一个网络切片与一个预设标识对应，例如，若小区支持的网络切片分别为网络切片1、网络切片2和网络切片3，则各个网络切片对应的预设标识可以参见表14。
表14
网络切片 预设标识
网络切片1 1
网络切片2 2
网络切片3 3
在方式b中，当消息3中的预设标识仅与第一PLMN对应时，第一网络切片可以通过其他方式指示。当消息3中的预设标识仅与第一网络切片对应时，第一PLMN可以通过其他方式指示。
方式c
在方式c中，第一消息中包括第一PLMN的标识和/或第一网络切片的标识。
其中，第一消息为消息1或消息3或消息A。
可选的，第一消息为消息A，第一PLMN的标识和/或第一网络切片的标识携带在数据载荷中。
在方式c中，当第一消息中包括第一PLMN的标识时，第一网络切片可以通过其他方式指示。当第一消息中包括第一网络切片的标识时，第一PLMN可以通过其他方式指示。
方式d
在方式d中，通过PRACH资源指示PLMN和/或网络切片，具体有以下3种情况(记为情况(1)、情况(2)和情况(3))。
情况(1)
在情况(1)下，通过PRACH资源指示PLMN和网络切片，该情况下，可选的，步骤1401在具体实现时包括：终端采用第一PRACH资源向接入网设备发送第一消息，第一PRACH资源与第一PLMN下的第一网络切片对应。相应的，接入网设备在第一PRACH资源上从终端接收第一消息。
在本申请实施例中，当PRACH资源与PLMN和网络切片对应时，一个PLMN下的一个网络切片与一个PRACH资源对应，例如，若小区支持2个PLMN，分别为PLMN1和PLMN2，PLMN1支持2个网络切片，分别为网络切片1和网络切片2，PLMN2支持3个网络切片，分别为网络切片1、网络切片2和网络切片3，则各个PLMN下的各个网络切片对应的PRACH资源可以参见表15。
表15
Figure PCTCN2019130985-appb-000013
Figure PCTCN2019130985-appb-000014
在情况(1)下，该方法还包括：接入网设备广播系统信息，系统信息中包括多个PLMN下的各个网络切片对应的PRACH资源。相应的，终端从接入网设备接收接入网设备广播的系统信息，并根据系统信息确定多个PLMN下的各个网络切片对应的PRACH资源。
情况(2)
在情况(2)下，通过PRACH资源指示网络切片，该情况下，可选的，步骤1401在具体实现时包括：终端采用第二PRACH资源向接入网设备发送第一消息，第二PRACH资源与第一网络切片对应。相应的，接入网设备在第二PRACH资源上从终端接收第一消息。
当PRACH资源与网络切片对应时，一个网络切片与一个PRACH资源对应，例如，若小区支持的网络切片分别为网络切片1、网络切片2和网络切片3，则各个网络切片对应的PRACH资源可以参见表16。
表16
网络切片 PRACH资源
网络切片1 1
网络切片2 2
网络切片3 3
在情况(2)中，若第一消息还指示第一PLMN，第一PLMN可以通过其他方式指示。例如，通过上述方式a至方式c中的任意一种方式指示。
可选的，该方法还包括：接入网设备广播系统信息，系统信息中包括通信系统中的各个网络切片对应的PRACH资源。相应的，终端从接入网设备接收接入网设备广播的系统信息，并根据系统信息确定通信系统中的各个网络切片对应的PRACH资源。
情况(3)
在情况(3)下，通过PRACH资源指示PLMN，该情况下，可选的，步骤1401在具体实现时包括：终端采用第三PRACH资源向接入网设备发送第一消息，第三PRACH资源与第一PLMN对应。相应的，接入网设备在第三PRACH资源上从终端接收第一消息。
当PRACH资源与PLMN对应时，一个PLMN与一个PRACH资源对应，例如，若小区支持2个PLMN，分别为PLMN1和PLMN2，则各个PLMN对应的PRACH资源可以参见表17。
表17
PLMN PRACH资源
PLMN1 1
PLMN2 3
在情况(3)中，若第一消息还指示第一网络切片，第一网络切片可以通过其他方式指示。例如，通过上述方式a至方式c中的任意一种方式指示。
在情况(3)中，可选的，该方法还包括：接入网设备广播系统信息，系统信息中包括多个PLMN对应的PRACH资源。相应的，终端从接入网设备接收接入网设备广播的 系统信息，系统信息中包括多个PLMN对应的PRACH资源；终端根据系统信息确定多个PLMN对应的PRACH资源。
在方式d中，系统信息可以为现有系统信息中的任意一个系统信息，还可以是未来演进的系统信息中的任意一个系统信息，本申请不作限制。
在方式d中，PRACH资源包括PRACH的时域资源和频域资源。PRACH的时域资源可以由高层参数PRACH配置索引(prach-ConfigurationIndex)指示，具体可通过查询3 GPP TS 38.211中的表Tables 6.3.3.2-2-6.3.3.2-4得到，prach-ConfigurationIndex可以指示PRACH格式、周期、周期内帧号、子帧号、起始符号、PRACH时隙、时隙内PRACH发送机会等信息。PRACH的频域资源由起始资源块(resource block，RB)、使用RB数量以及资源重复次数确定，其中起始RB和资源重复次数由高层参数消息1-频域起始(msg1-FrequencyStart)和消息1-频分多路复用(frequency-division multiplexing，FDM)(msg1-FDM)确定，RB数由3 GPP TS 38.211中的表Table 6.3.3.2-11确定。
上述主要从各个网元之间交互的角度对本申请实施例的方案进行了介绍。可以理解的是，各个网元，例如CU、DU、终端、接入网设备等为了实现上述功能，其包括了执行各个功能相应的硬件结构和/或软件模块。本领域技术人员应该很容易意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，本申请能够以硬件或硬件和计算机软件的结合形式来实现。某个功能究竟以硬件还是计算机软件驱动硬件的方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
本申请实施例可以根据上述方法示例对CU、DU、终端、接入网设备进行功能单元的划分，例如，可以对应各个功能划分各个功能单元，也可以将两个或两个以上的功能集成在一个处理单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。需要说明的是，本申请实施例中对单元的划分是示意性的，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式。
在采用集成单元的情况下，图15示出了上述实施例中涉及的一种通信装置150。该通信装置150可以包括处理单元1501、以及通信单元1502。可选的，该通信装置150还包括存储单元1503。图15所示的结构示意图可以用于示意上述实施例中所涉及的CU、DU、终端、接入网设备的结构。
当图15所示的结构示意图用于示意上述实施例中所涉及的DU的结构时，处理单元1501用于对DU的动作进行控制管理，例如，处理单元1501用于支持DU执行图8中的801和802，图8A中的801、802、11)、12)、13a)、14a)，图9中的901至906以及908和909，和/或本申请实施例中所描述的其他过程中的DU执行的动作。处理单元1501可以通过通信单元1502与其他网络实体通信，例如，与图8中示出的CU之间通信。存储单元1503用于存储DU的程序代码和数据。
当图15所示的结构示意图用于示意上述实施例中所涉及的DU的结构时，通信装置150可以是一个设备，也可以是设备内的芯片。
当图15所示的结构示意图用于示意上述实施例中所涉及的CU的结构时，处理单 元1501用于对CU的动作进行控制管理，例如，处理单元1501用于支持CU执行图8中的802和803，图8A中的802、12)、13a)、15a)、13b)，图9中的902、903、906至910，和/或本申请实施例中所描述的其他过程中的CU执行的动作。处理单元1501可以通过通信单元1502与其他网络实体通信，例如，与图8中示出的DU之间通信。存储单元1503用于存储CU的程序代码和数据。
当图15所示的结构示意图用于示意上述实施例中所涉及的CU的结构时，通信装置150可以是一个设备，也可以是设备内的芯片。
当图15所示的结构示意图用于示意上述实施例中所涉及的终端的结构时，处理单元1501用于对终端的动作进行控制管理，例如，处理单元1501用于支持终端执行图9中的901、904、905和909，图10中的1002和1003，图11中的1101至1104、1108，图11A中的11)至13)，图11B中的21)和22)，图12中的各个步骤，图13中的各个步骤，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中的终端执行的动作。处理单元1501可以通过通信单元1502与其他网络实体通信，例如，与图11中示出的接入网设备之间通信。存储单元1503用于存储终端的程序代码和数据。
当图15所示的结构示意图用于示意上述实施例中所涉及的终端的结构时，通信装置150可以是一个设备，也可以是设备内的芯片。
当图15所示的结构示意图用于示意上述实施例中所涉及的接入网设备的结构时，处理单元1501用于对接入网设备的动作进行控制管理，例如，处理单元1501用于支持接入网设备执行图10中的1001和1002，图11中的1101、1104至1106、1108，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中的接入网设备执行的动作。处理单元1501可以通过通信单元1502与其他网络实体通信，例如，与图11中示出的终端之间通信。存储单元1503用于存储接入网设备的程序代码和数据。
当图15所示的结构示意图用于示意上述实施例中所涉及的接入网设备的结构时，通信装置150可以是一个设备，也可以是设备内的芯片。
图15中的集成的单元如果以软件功能模块的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请实施例的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)或处理器(processor)执行本申请各个实施例方法的全部或部分步骤。存储计算机软件产品的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
图15中的单元也可以称为模块，例如，处理单元可以称为处理模块。
图16是本申请实施例提供的通信装置160的硬件结构示意图。通信装置160包括一个或多个处理器1601和通信接口1603。
可选的，该通信装置160还包括存储器1604，存储器1604可以包括只读存储器和随机存取存储器，并向处理器1601提供操作指令和数据。存储器1604的一部分还 可以包括非易失性随机存取存储器(non-volatile random access memory，NVRAM)。
在本申请实施例中，该通信装置160通过调用存储器1604存储的操作指令(该操作指令可存储在操作系统中)，执行相应的操作。
处理器1601还可以称为中央处理单元(central processing unit，CPU)。
处理器1601、通信接口1603以及存储器1604通过总线系统1602耦合在一起，其中，总线系统1602除包括数据总线之外，还可以包括电源总线、控制总线和状态信号总线等。但是为了清楚说明起见，在图16中将各种总线都标为总线系统1602。
上述本申请实施例揭示的方法可以应用于处理器1601中，或者由处理器1601实现。处理器1601可能是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法的各步骤可以通过处理器1601中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器1601可以是通用处理器、数字信号处理器(digital signal processing，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现成可编程门阵列(field-programmable gate array，FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成，或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1604，处理器1601读取存储器1604中的信息，结合其硬件完成上述方法的步骤。
示例性的，图16所示的结构示意图可以用于示意上述实施例中所涉及的CU、DU、终端、接入网设备的结构。
当图16所示的结构示意图用于示意上述实施例中所涉及的DU的结构时，处理器1601用于对DU的动作进行控制管理，例如，处理器1601用于支持DU执行图8中的801和802，图8A中的801、802、11)、12)、13a)、14a)，图9中的901至906以及908和909，和/或本申请实施例中所描述的其他过程中的DU执行的动作。处理器1601可以通过通信接口1603与其他网络实体通信，例如，与图8中示出的CU之间通信。存储器1604用于存储DU的程序代码和数据。
当图16所示的结构示意图用于示意上述实施例中所涉及的CU的结构时，处理器1601用于对CU的动作进行控制管理，例如，处理器1601用于支持CU执行图8中的802和803，图8A中的802、12)、13a)、15a)、13b)，图9中的902、903、906至910，和/或本申请实施例中所描述的其他过程中的CU执行的动作。处理器1601可以通过通信接口1603与其他网络实体通信，例如，与图8中示出的DU之间通信。存储器1604用于存储CU的程序代码和数据。
当图16所示的结构示意图用于示意上述实施例中所涉及的终端的结构时，处理器1601用于对终端的动作进行控制管理，例如，处理器1601用于支持终端执行图9中的901、904、905和909，图10中的1002和1003，图11中的1101至1104、1108，图11A中的11)至13)，图11B中的21)和22)，图12中的各个步骤，图13中的各个步骤，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中的终 端执行的动作。处理器1601可以通过通信接口1603与其他网络实体通信，例如，与图11中示出的接入网设备之间通信。存储器1604用于存储终端的程序代码和数据。
当图16所示的结构示意图用于示意上述实施例中所涉及的接入网设备的结构时，处理器1601用于对接入网设备的动作进行控制管理，例如，处理器1601用于支持接入网设备执行图10中的1001和1002，图11中的1101、1104至1106、1108，图14中的1401和1402，和/或本申请实施例中所描述的其他过程中的接入网设备执行的动作。处理器1601可以通过通信接口1603与其他网络实体通信，例如，与图11中示出的终端之间通信。存储器1604用于存储接入网设备的程序代码和数据。
以上通信单元或通信接口可以是一种该装置的接口电路或通信接口，用于从其它装置接收信号。例如，当该装置以芯片的方式实现时，该通信单元或通信接口是该芯片用于从其它芯片或装置接收信号或发送信号的接口电路或通信接口。
在上述实施例中，存储器存储的供处理器执行的指令可以以计算机程序产品的形式实现。计算机程序产品可以是事先写入在存储器中，也可以是以软件形式下载并安装在存储器中。
计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(例如同轴电缆、光纤、数字用户线(DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存储的任何可用介质或者是包括一个或多个可用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质，(例如，软盘、硬盘、磁带)、光介质(例如，DVD)、或者半导体介质(例如固态硬盘solid state disk，SSD)等。
可选的，本申请实施例还提供一种计算机可读存储介质，所述计算机可读存储介质中存储有计算机指令；当所述计算机可读存储介质在计算机上运行时，使得该计算机执行本申请实施例所提供的通信方法。
本申请实施例还提供了一种包含计算机指令的计算机程序产品，当其在计算机上运行时，使得计算机可以执行本申请实施例提供的通信方法。
本申请实施例还提供一种芯片，该芯片包括处理器，该处理器执行指令时，使得该芯片可以执行本申请实施例提供的通信方法。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件程序实现时，可以全部或部分地以计算机程序产品的形式来实现。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行计算机程序指令时，全部或部分地产生按照本申请实施例的流程或功能。计算机可以是通用计算机、专用计算机、计算机网络、或者其他可编程装置。计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，例如，计算机指令可以从一个网站站点、计算机、服务器或者数据中心通过有线(例如同轴电缆、光纤、数字用户线(digital subscriber line，DSL))或无线(例如红 外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。计算机可读存储介质可以是计算机能够存取的任何可用介质或者是包括一个或多个可以用介质集成的服务器、数据中心等数据存储设备。可用介质可以是磁性介质(例如，软盘、硬盘、磁带)，光介质(例如，DVD)、或者半导体介质(例如，SSD)等。
尽管在此结合各实施例对本申请进行了描述，然而，在实施所要求保护的本申请过程中，本领域技术人员通过查看附图、公开内容、以及所附权利要求书，可理解并实现公开实施例的其他变化。在权利要求中，“包括”(comprising)一词不排除其他组成部分或步骤，“一”或“一个”不排除多个的情况。单个处理器或其他单元可以实现权利要求中列举的若干项功能。相互不同的从属权利要求中记载了某些措施，但这并不表示这些措施不能组合起来产生良好的效果。
尽管结合具体特征及其实施例对本申请进行了描述，显而易见的，在不脱离本申请的精神和范围的情况下，可对其进行各种修改和组合。相应地，本说明书和附图仅仅是所附权利要求所界定的本申请的示例性说明，且视为已覆盖本申请范围内的任意和所有修改、变化、组合或等同物。显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包括这些改动和变型在内。

Claims (28)

  1. 一种通信方法，其特征在于，包括：
    分布式单元DU获取所述DU的小区所支持的至少两个公共陆地移动网络PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；
    所述DU向集中式单元CU发送所述资源占用信息。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    所述DU从终端接收请求信息，所述请求信息包括第一PLMN的标识和第一网络切片的标识，所述请求信息用于所述终端请求接入所述第一PLMN下的所述第一网络切片；
    所述DU向所述CU发送所述请求信息。
  3. 根据权利要求2所述的方法，其特征在于，所述方法还包括：
    所述DU从所述CU接收释放信息，所述释放信息用于指示所述终端释放与所述CU之间的无线资源控制RRC连接；
    所述DU向所述终端发送所述释放信息。
  4. 根据权利要求3所述的方法，其特征在于，所述释放信息中包括释放原因，所述释放原因包括：所述第一PLMN下的所述第一网络切片的资源不足。
  5. 根据权利要求2-4任一项所述的方法，其特征在于，所述资源占用信息用于所述CU确定是否允许所述终端接入所述第一PLMN下的所述第一网络切片。
  6. 一种通信方法，其特征在于，包括：
    集中式单元CU从分布式单元DU接收所述DU的小区所支持的至少两个公共陆地移动网络PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；
    所述CU使用所述资源占用信息。
  7. 根据权利要求6所述的方法，其特征在于，所述方法还包括：
    所述CU从所述DU接收请求信息，所述请求信息包括第一PLMN的标识和第一网络切片的标识，所述请求信息用于终端请求接入所述第一PLMN下的所述第一网络切片；
    所述CU使用所述资源占用信息，包括：在所述CU根据所述资源占用信息确定不允许所述终端接入所述第一PLMN下的所述第一网络切片、且所述终端与所述CU建立无线资源控制RRC连接的情况下，所述CU向所述DU发送释放信息，所述释放信息用于指示所述终端释放与所述CU之间的RRC连接。
  8. 根据权利要求7所述的方法，其特征在于，在所述CU根据所述资源占用信息确定不允许所述终端接入所述第一PLMN下的所述第一网络切片、且所述终端与所述CU建立RRC连接的情况下，所述CU向所述DU发送释放信息，包括：
    在所述CU根据所述资源占用信息确定所述第一PLMN下的所述第一网络切片的资源占用率大于或等于阈值、且所述终端与所述CU建立RRC连接的情况下，所述CU向所述DU发送所述释放信息。
  9. 根据权利要求7所述的方法，其特征在于，在所述CU根据所述资源占用信息确定不允许所述终端接入所述第一PLMN下的所述第一网络切片、且所述终端与所述CU建立RRC连接的情况下，所述CU向所述DU发送释放信息，包括：
    在所述CU根据所述资源占用信息确定所述第一PLMN下的所述第一网络切片不是 所述至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片、且所述终端与所述CU建立RRC连接的情况下，所述CU向所述DU发送所述释放信息。
  10. 根据权利要求7所述的方法，其特征在于，在所述CU根据所述资源占用信息确定不允许所述终端接入所述第一PLMN下的所述第一网络切片、且所述终端与所述CU建立RRC连接的情况下，所述CU向所述DU发送释放信息，包括：
    在所述CU根据所述资源占用信息确定所述第一PLMN下的所述第一网络切片的资源过载、且所述终端与所述CU建立RRC连接的情况下，所述CU向所述DU发送所述释放信息。
  11. 根据权利要求7-10任一项所述的方法，其特征在于，所述释放信息中包括释放原因，所述释放原因包括：所述第一PLMN下的所述第一网络切片的资源不足。
  12. 根据权利要求7-11任一项所述的方法，其特征在于，所述方法还包括：
    所述CU向所述第一PLMN中的移动管理功能AMF发送拒绝所述终端接入的原因，所述原因包括：所述第一PLMN下的所述第一网络切片的资源不足。
  13. 一种通信装置，其特征在于，包括：处理单元和通信单元；
    所述处理单元，用于获取所述通信装置的小区所支持的至少两个公共陆地移动网络PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；
    所述通信单元，用于向集中式单元CU发送所述资源占用信息。
  14. 根据权利要求13所述的通信装置，其特征在于，
    所述通信单元，还用于从终端接收请求信息，并向所述CU发送所述请求信息；其中，所述请求信息包括第一PLMN的标识和第一网络切片的标识，所述请求信息用于所述终端请求接入所述第一PLMN下的所述第一网络切片。
  15. 根据权利要求14所述的通信装置，其特征在于，
    所述通信单元，还用于从所述CU接收释放信息，并向所述终端发送所述释放信息；其中，所述释放信息用于指示所述终端释放与所述CU之间的无线资源控制RRC连接。
  16. 根据权利要求15所述的通信装置，其特征在于，所述释放信息中包括释放原因，所述释放原因包括：所述第一PLMN下的所述第一网络切片的资源不足。
  17. 根据权利要求14-16任一项所述的通信装置，其特征在于，所述资源占用信息用于所述CU确定是否允许所述终端接入所述第一PLMN下的所述第一网络切片。
  18. 一种通信装置，其特征在于，包括：处理单元和通信单元；
    所述通信单元，用于从分布式单元DU接收所述DU的小区所支持的至少两个公共陆地移动网络PLMN下的各个网络切片的资源占用信息，所述至少两个PLMN下的各个网络切片共享资源；
    所述处理单元，用于使用所述资源占用信息。
  19. 根据权利要求18所述的通信装置，其特征在于，
    所述通信单元，还用于从所述DU接收请求信息，所述请求信息包括第一PLMN的标识和第一网络切片的标识，所述请求信息用于终端请求接入所述第一PLMN下的所述第一网络切片；
    所述处理单元，具体用于在所述通信装置根据所述资源占用信息确定不允许所述 终端接入所述第一PLMN下的所述第一网络切片、且所述终端与所述通信装置建立无线资源控制RRC连接的情况下，通过所述通信单元向所述DU发送释放信息，所述释放信息用于指示所述终端释放与所述通信装置之间的RRC连接。
  20. 根据权利要求19所述的通信装置，其特征在于，所述处理单元，具体用于：
    在所述通信装置根据所述资源占用信息确定所述第一PLMN下的所述第一网络切片的资源占用率大于或等于阈值、且所述终端与所述通信装置建立RRC连接的情况下，通过所述通信单元向所述DU发送所述释放信息。
  21. 根据权利要求19所述的通信装置，其特征在于，所述处理单元，具体用于：
    在所述通信装置根据所述资源占用信息确定所述第一PLMN下的所述第一网络切片不是所述至少两个PLMN下的第一网络切片中的资源占用率最低的第一网络切片、且所述终端与所述通信装置建立RRC连接的情况下，通过所述通信单元向所述DU发送所述释放信息。
  22. 根据权利要求19所述的通信装置，其特征在于，所述处理单元，具体用于：
    在所述通信装置根据所述资源占用信息确定所述第一PLMN下的所述第一网络切片的资源过载、且所述终端与所述通信装置建立RRC连接的情况下，通过所述通信单元向所述DU发送所述释放信息。
  23. 根据权利要求19-22任一项所述的通信装置，其特征在于，所述释放信息中包括释放原因，所述释放原因包括：所述第一PLMN下的所述第一网络切片的资源不足。
  24. 根据权利要求19-23任一项所述的通信装置，其特征在于，
    所述通信单元，还用于向所述第一PLMN中的移动管理功能AMF发送拒绝所述终端接入的原因，所述原因包括：所述第一PLMN下的所述第一网络切片的资源不足。
  25. 一种通信装置，其特征在于，包括：存储器和处理器；
    所述存储器用于存储计算机执行指令，所述处理器执行所述存储器存储的所述计算机执行指令，以使所述通信装置实现如权利要求1至5中的任一项所述的方法；或者，实现如权利要求6至12中的任一项所述的方法。
  26. 一种计算机可读存储介质，其特征在于，包括指令，当所述指令在计算机上运行时，使得所述计算机执行如权利要求1至5中的任一项所述的方法；或者，执行如权利要求6至12中的任一项所述的方法。
  27. 一种计算机程序产品，其特征在于，包括指令，当所述指令在计算机上运行时，使得所述计算机执行如权利要求1至5中的任一项所述的方法；或者，执行如权利要求6至12中的任一项所述的方法。
  28. 一种芯片，其特征在于，包括：处理器和接口，所述处理器通过所述接口与存储器耦合，当所述处理器执行所述存储器中的计算机程序或指令时，使得权利要求1至5中的任一项所述的方法，或者，权利要求6至12中的任一项所述的方法被执行。
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