WO2020029747A1 - 一种无线资源控制rrc连接建立方法及相关设备 - Google Patents

一种无线资源控制rrc连接建立方法及相关设备 Download PDF

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Publication number
WO2020029747A1
WO2020029747A1 PCT/CN2019/095851 CN2019095851W WO2020029747A1 WO 2020029747 A1 WO2020029747 A1 WO 2020029747A1 CN 2019095851 W CN2019095851 W CN 2019095851W WO 2020029747 A1 WO2020029747 A1 WO 2020029747A1
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Prior art keywords
message
rrc connection
information
distributed unit
connection establishment
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PCT/CN2019/095851
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English (en)
French (fr)
Inventor
晋英豪
张宏卓
杨旭东
谭巍
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华为技术有限公司
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Publication of WO2020029747A1 publication Critical patent/WO2020029747A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/18—Management of setup rejection or failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/22—Processing or transfer of terminal data, e.g. status or physical capabilities
    • H04W8/24—Transfer of terminal data

Definitions

  • the present application relates to the field of wireless network technologies, and in particular, to a method for establishing a radio resource control RRC connection and related equipment.
  • gNB For base stations in the access network, such as 5G base stations (next generation base stations, gNB), according to the protocol stack function, gNB can be split into two parts: a central unit (CU) and a distributed unit (distributed unit, DU).
  • the CU includes the main functions of the gNB, such as mobility management and radio resource control (RRC) functions of the UE, and the DU includes some gNB functions other than the CU, such as media access control (MAC) Protocol stack functions and physical layer (PHY) protocol stack functions.
  • RRC radio resource control
  • MAC media access control
  • PHY physical layer
  • An embodiment of the present application provides a method for establishing a radio resource control RRC connection, so as to ensure normal communication.
  • an embodiment of the present application provides a method for establishing a radio resource control RRC connection, including: a central unit of an access network first receiving a first message sent by a distributed unit of the access network, where the first message includes a user unit UE Send the first cause value information of the RRC connection establishment request to the distributed unit; and then send a second message to the distributed unit, the second message including the RRC connection establishment message and the first indication information, the first indication information is used to indicate the distributed unit Allow the UE to establish an RRC connection.
  • the first instruction information instructs the DU to allow the UE to access the network, thereby enabling the UE to access the network, so as to ensure normal communication.
  • the CU after receiving the first message sent by the DU, the CU determines to allow the UE to establish an RRC connection according to the first cause value information. Therefore, the CU can determine whether to allow the UE to quickly access the network by determining the first cause value information.
  • the central unit sends the second message to the distributed unit, including: when the central unit determines that the distributed unit denies access to the UE, the central unit sends the second message to the distributed unit. It is realized that the CU may instruct the DU to allow the UE to access the network by sending a second message when the DU denies the UE access.
  • the CU re-decides to let the UE access the network and will not fully accept the DU's access control decision. Therefore, the CU generates an RRC connection establishment message for the UE.
  • the RRC connection establishment message includes the CU's allocation for the UE.
  • the configuration information of the SRB1 protocol stack such as the configuration information of the high-level protocol stack.
  • the configuration information of the high-level protocol stack may include PDCP configuration information. Therefore, the UE establishes an RRC connection after receiving the RRC connection establishment message, and accesses the network after completing the SRB1 configuration.
  • the first cause value information may be emergency, high-priority access, or access network notification area update, so that the UE can access the network in various scenarios.
  • the second message is a downlink RRC transmission message or a UE context establishment request message.
  • the first indication information may be first cause value information, second cause value information, or indication value information.
  • the second message includes configuration information of a high-level protocol stack of a signaling radio bearer allocated by the central unit to the UE. Therefore, the UE can access the network after completing the SRB1 configuration according to the configuration information.
  • the first indication information is used to instruct the DU to allow the UE to establish an RRC connection.
  • the first indication information may instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide a service for the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; Either suggest that the DU allows the UE to establish an RRC connection; or suggest that the DU provide services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on. Therefore, the DU can re-determine whether to allow the UE to access the network according to the first indication information.
  • the second cause value information may be generated according to the first cause value information in the first message or related to the first cause value information.
  • the indication value information may be a specific value, such as 0 or 1.
  • the indication value information when the indication value information is 1, instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide services to the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; or suggest that the DU allow the UE to establish an RRC connection Connect; or suggest that the DU provides services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on.
  • the indication value information is 0 or there is no indication value information
  • the DU may reject the RRC connection establishment request of the UE. Therefore, the DU can re-determine whether to allow the UE to access the network according to the indication value information.
  • the indication value information may further indicate that the RRC connection establishment message included in the second message needs to be sent on SRB1.
  • the DU confirms that the CU allows the UE to access the network. Therefore, the DU can re-determine whether to allow the UE to access the network according to the indication value information.
  • the DU may still refuse to establish the RRC access network of the UE, for example, it is still congested and the service services are all emergency calls.
  • the CU may receive a third message sent by the DU, where the third message includes second indication information, and the second indication information is used to instruct the DU to refuse the UE to establish an RRC connection. This allows the CU to reconsider whether to allow the UE to access the network.
  • the third message may also carry the reason why the DU refuses the UE to establish an RRC connection. This allows the CU to reconsider whether to allow the UE to access the network.
  • an embodiment of the present application provides a method for establishing a radio resource control RRC connection, including: a central unit of an access network first receiving a first message sent by a distributed unit of the access network, where the first message includes a first timing Device information, the first timer information is used to indicate the time when the distributed unit generates the user unit UE to resend the RRC connection establishment request; and then sends a second message to the distributed unit, the second message includes the second timer information, the second timing
  • the device information is used to instruct the UE to resend the RRC connection establishment request time.
  • the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information. This allows the UE to resend the RRC connection establishment request to access the network after waiting for the time indicated by the second timer information, so as to ensure normal communication.
  • the CU when the CU determines that the UE is rejected from establishing an RRC connection, the CU generates an RRC connection rejection message, and the RRC connection rejection message includes second timer information. Therefore, the UE can resend the RRC connection establishment request to access the network after receiving the RRC connection rejection message, so as to ensure normal communication.
  • the CU confirming that the DU denies the UE access to the network includes: confirming by using a first message. For example, if the first message does not include DU, CU, and RRC information, it can be confirmed that the CU confirms that the DU denies the UE access to the network. Or the first message includes the first timer information, which can confirm that the CU confirms that the DU denies the UE access to the network.
  • an embodiment of the present application provides a method for establishing a radio resource control RRC connection, which includes: when a distributed unit of an access network rejects an RRC connection establishment request of a user unit UE, the distributed unit first sends The central unit of the network sends a first message, the first message includes the first reason value information of the RRC connection establishment request; and then receives a second message sent by the central unit, the second message includes the RRC connection establishment message and the first indication information, the first The indication information is used to instruct the distributed unit to allow the UE to establish an RRC connection.
  • the first instruction information instructs the DU to allow the UE to access the network, thereby enabling the UE to access the network, so as to ensure normal communication.
  • the distributed unit receiving the second message sent by the central unit includes: when the central unit determines that the distributed unit rejects the UE access, the distributed unit receives the second message sent by the central unit. In the case where the DU rejects the UE access, it is determined whether to allow the UE to access the network again.
  • the distributed unit after the distributed unit receives the second message sent by the central unit, the distributed unit sends an RRC connection establishment message to the UE.
  • the RRC connection establishment message includes a signaling radio bearer protocol allocated by the central unit to the UE. Configuration information of the stack. Therefore, the UE establishes an RRC connection after receiving the RRC connection establishment message, and accesses the network after completing the SRB1 configuration.
  • the first cause value information may be an emergency, a high-priority access, or an access network notification area update.
  • the second message is a downlink RRC transmission message or a UE context establishment request message.
  • the second message includes configuration information of a high-level protocol stack of a signaling radio bearer allocated by the central unit to the UE. Therefore, the UE can access the network after completing the SRB1 configuration according to the configuration information.
  • the first indication information may be first cause value information, second cause value information, or indication value information.
  • the first indication information is used to instruct the DU to allow the UE to establish an RRC connection.
  • the first indication information may instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide a service for the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; Either suggest that the DU allows the UE to establish an RRC connection; or suggest that the DU provide services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on. Therefore, the DU can re-determine whether to allow the UE to access the network according to the first indication information.
  • the second cause value information may be generated according to the first cause value information in the first message or related to the first cause value information.
  • the indication value information may be a specific value, such as 0 or 1.
  • the indication value information when the indication value information is 1, instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide services to the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; or suggest that the DU allow the UE to establish an RRC connection Connect; or suggest that the DU provides services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on.
  • the indication value information is 0 or there is no indication value information
  • the DU may reject the RRC connection establishment request of the UE. Therefore, the DU can re-determine whether to allow the UE to access the network according to the indication value information.
  • the indication value information may further indicate that the RRC connection establishment message included in the second message needs to be sent on SRB1.
  • the DU considers that the CU allows the UE to access the network. Therefore, the DU can re-determine whether to allow the UE to access the network according to the indication value information.
  • the DU may still refuse to establish the RRC access network of the UE, for example, it is still congested and the service services are all emergency calls.
  • the DU may send a third message to the CU, where the third message includes second indication information, and the second indication information is used to instruct the DU to reject the UE from establishing an RRC connection.
  • an embodiment of the present application provides a method for establishing a radio resource control RRC connection, including: a distributed unit of an access network first sends a first message to a central unit of the access network, and the first message includes a first timer Information, the first timer information is used to indicate the time when the distributed unit generates the user unit UE to resend the RRC connection establishment request; and then receives a second message sent by the central unit, the second message includes the RRC connection rejection message and the second timer information
  • the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information. This allows the UE to resend the RRC connection establishment request to access the network after waiting for the time indicated by the second timer information, so as to ensure normal communication.
  • the distributed unit after receiving the second message sent by the central unit, the distributed unit sends an RRC connection rejection message to the UE.
  • the RRC connection rejection message includes second timer information, and the second timer information is used to instruct the UE to restart. Time when the RRC connection establishment request was sent. Therefore, the UE can resend the RRC connection establishment request to access the network after receiving the RRC connection rejection message, so as to ensure normal communication.
  • connection establishment request message may be an RRC connection establishment request, an RRC re-establishment request message, or an RRC resume request message.
  • an embodiment of the present application provides a radio resource control RRC connection establishment method, including: a user unit UE sends an RRC connection establishment request to a distributed unit of an access network; and the UE receives an RRC connection establishment message sent by the distributed unit.
  • the RRC connection establishment message includes configuration information of a signaling radio bearer allocated by the central unit of the access network to the UE, and the configuration information is used to instruct the UE to configure the signaling radio bearer. Therefore, the UE can access the network after completing the SRB1 configuration according to the configuration information, so as to ensure normal communication.
  • the configuration information does not include the configuration information of the signaling radio bearer allocated by the DU for the UE.
  • the UE after receiving the RRC connection establishment message, the UE configures the SRB1 of the UE according to the configuration information of the SRB1 high-level protocol stack allocated to the UE by the CU in the RRC connection establishment message, such as the configuration information of the PDCP protocol stack .
  • the UE uses the configuration information of the underlying protocol stack of the default signaling radio bearer. Therefore, the UE can access the network after completing the SRB1 configuration according to the configuration information.
  • the UE receives the RRC connection establishment message sent by the distributed unit, and after completing the configuration, sends the RRC connection establishment completion message to the DU. Thereby, it is notified that the RRC connection establishment is completed.
  • an embodiment of the present application provides a method for establishing a radio resource control RRC connection, including: a UE sending a connection establishment request message to a distributed unit of an access network; and then receiving an RRC connection rejection message sent by the distributed unit, RRC
  • the connection rejection message includes second timer information, and the second timer information is used to instruct the UE to resend the RRC connection establishment request time. Therefore, the UE can resend the RRC connection establishment request to access the network after waiting for the time indicated by the second timer information, so as to ensure normal communication.
  • the UE resends the RRC connection establishment request to the distributed unit after the time indicated by the second timer information. To enable the UE to re-access the network to ensure normal communication.
  • the DU allocates first timer information to the UE.
  • the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information, and the first timer information is used to instruct the user unit UE generated by the distributed unit to resend the RRC connection establishment Requested time.
  • connection establishment request message may be an RRC connection establishment request, an RRC re-establishment request message, or an RRC resume request message.
  • an embodiment of the present application provides a central unit of an access network.
  • the central unit is configured to implement the methods and functions performed by the central unit in the first and second aspects, and is implemented by hardware / software. Its hardware / software includes modules corresponding to the above functions.
  • an embodiment of the present application provides a distributed unit of an access network.
  • the distributed unit is configured to implement the methods and functions performed by the distributed unit in the third and fourth aspects, and is implemented by hardware.
  • / Software implementation whose hardware / software includes modules corresponding to the above functions.
  • an embodiment of the present application provides a user unit configured to implement the methods and functions performed by the user unit in the fifth aspect and the sixth aspect, which are implemented by hardware / software, and the hardware /
  • the software includes modules corresponding to the above functions.
  • an embodiment of the present application provides another central unit, including a processor and a memory.
  • the processor executes a program stored in the memory to implement the radio resource control RRC provided by the first aspect and the second aspect. Steps in the connection establishment method.
  • the central unit provided in the embodiment of the present application further includes a communication bus, and the communication bus is used to implement connection and communication between the processor and the memory.
  • the central unit provided in the embodiment of the present application may include a module corresponding to the behavior of the central unit in the foregoing method design.
  • Modules can be software and / or hardware.
  • an embodiment of the present application provides another distributed unit, including: a processor and a memory.
  • the processor executes a program stored in the memory to implement the wireless resource provided by the third aspect and the fourth aspect. Controls the steps in the RRC connection establishment method.
  • the distributed unit provided in the embodiment of the present application further includes a communication bus, and the communication bus is used to implement connection and communication between the processor and the memory.
  • the distributed unit provided in the embodiment of the present application may include a module corresponding to the behavior of the distributed unit in the foregoing method design.
  • Modules can be software and / or hardware.
  • an embodiment of the present application provides another user unit, including: a processor and a memory.
  • the processor executes a program stored in the memory to implement the radio resource control RRC connection establishment method provided in the third aspect. Steps.
  • the user unit provided in the embodiment of the present application further includes a communication bus, and the communication bus is used to implement connection and communication between the processor and the memory.
  • the user unit provided in the embodiment of the present application may include a module corresponding to the behavior of the user unit in the above method design.
  • Modules can be software and / or hardware.
  • the present application provides a computer-readable storage medium having instructions stored in the computer-readable storage medium, which when executed on a computer, causes the computer to execute the methods of the above aspects.
  • the present application provides a computer program product containing instructions that, when run on a computer, causes the computer to perform the methods of the above aspects.
  • FIG. 1 is a schematic structural diagram of an access network system according to an embodiment of the present application.
  • FIG. 2 is a schematic flowchart of a method for initial establishment of an RRC connection according to an embodiment of the present application
  • FIG. 3 is a schematic flowchart of another method for initially establishing an RRC connection according to an embodiment of the present application
  • FIG. 4 is a schematic flowchart of an RRC establishment method according to an embodiment of the present application.
  • FIG. 5 is a schematic flowchart of another RRC establishment method according to an embodiment of the present application.
  • FIG. 6 is a schematic flowchart of another RRC establishment method according to an embodiment of the present application.
  • FIG. 7 is a schematic structural diagram of a central unit of an access network according to an embodiment of the present application.
  • FIG. 8 is a schematic structural diagram of a distributed unit of an access network according to an embodiment of the present application.
  • FIG. 9 is a schematic structural diagram of a user unit according to an embodiment of the present application.
  • FIG. 10 is a schematic structural diagram of another central unit according to an embodiment of the present application.
  • FIG. 11 is a schematic structural diagram of another distributed unit according to an embodiment of the present application.
  • FIG. 12 is a schematic structural diagram of another user unit according to an embodiment of the present application.
  • FIG. 1 is a schematic structural diagram of a network system according to an embodiment of the present application.
  • the network system includes a user unit (UE) and an access network.
  • the access network may include a base station.
  • a base station for example, a 5G base station (next generation base station, gNB), an access point, a Node B, or an evolution node (environment Bureau, eNB), and so on.
  • gNB can be split into two parts: CU and DU. Both CU and DU are logical nodes.
  • the CU can include protocol stacks such as Service Data Protocol (SDAP), packet data convergence protocol (PDCP), and radio resource control (RRC).
  • SDAP Service Data Protocol
  • PDCP packet data convergence protocol
  • RRC radio resource control
  • DU includes protocol stack entities such as media access control (MAC), physical layer (PHY) and radio link control layer protocol (radio link control (RLC)).
  • MAC media access control
  • PHY physical layer
  • RLC radio link control layer protocol
  • CU can include service data protocol stack (service data protocol, SDAP), packet data convergence protocol (packet data convergence protocol, PDCP), wireless link.
  • Control layer protocols radio link control (RLC)
  • RRC radio resource control
  • DU includes media access control (MAC) and physical layer (physical physical layer (PHY)) protocol stacks entity.
  • a gNB may include one CU and multiple DUs.
  • the CU and the DUs are connected through an interface, which is referred to as an F1 interface in this application.
  • One CU may connect multiple DUs.
  • a subscriber unit may refer to a device that provides a voice and / or data connection to a user, may also be connected to a computing device such as a laptop or desktop computer, or it may be a personal digital assistant (PDA ), Etc.
  • PDA personal digital assistant
  • the user unit can also be a station (STA), a system, a user station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, or a user device.
  • An access network refers to a device in an access network that communicates with a wireless terminal over one or more sectors on the air interface.
  • FIG. 2 is a schematic flowchart of a method for initial establishment of an RRC connection according to an embodiment of the present application. As shown in the figure, at least the following steps are included:
  • the UE sends an RRC connection establishment request (RRC connection request) to the DU.
  • RRC connection request RRC connection request
  • the DU After receiving the RRC connection establishment request, the DU performs access control. If the DU allows the UE to access the network, it generates configuration information for the protocol stack of the signaling radio bearer (SRB) 1 for the UE, such as the underlying protocol. Configuration information of the stack.
  • SRB signaling radio bearer
  • the configuration information of the underlying protocol stack includes configuration information of at least one of the protocol stacks of RLC, MAC, or PHY, and the configuration information is placed in a cell of an F1 interface, which is referred to as DU-to-CU RRC in this application Information (DU to CU, RRC, Information) cells, and finally to the CU, an initial uplink RRC transmission message (initial UL RRC message transfer) message, the initial uplink RRC transmission message includes DU to CU RRC information.
  • the CU After the CU receives the initial uplink RRC message, if the initial uplink RRC transmission message includes DU and CU RRC information, it is confirmed that the DU has allowed the UE to access the network, and if the CU also allows the UE to access the network, an RRC connection is established.
  • the message includes configuration information of the SRB1 protocol stack allocated by the CU to the UE, such as configuration information of a high-level protocol stack.
  • the configuration information of the high-level protocol stack may include PDCP configuration information.
  • the RRC connection establishment message may also include configuration information of the protocol stack of the SRB1 allocated by the DU to the CU in the RRC information to the UE.
  • the CU sends a downlink RRC transfer message (DL RRC message transfer message) to the DU, and the downlink RRC transfer message includes an RRC connection establishment message.
  • DL RRC message transfer message downlink RRC transfer message
  • the DU After receiving the downlink RRC transmission message sent by the CU, the DU sends an RRC connection establishment message to the UE.
  • the UE After receiving the RRC connection establishment message, the UE configures the SRB1 of the UE according to the configuration information of the SRB1 high-level protocol stack allocated by the CU for the UE and the configuration information of the SRB1 lower-level protocol stack allocated by the DU for the UE. After the UE completes the configuration of SRB1, it sends an RRC connection establishment complete message to the DU.
  • the DU sends an uplink RRC transfer message (UL RRC message transfer message) to the CU.
  • the uplink RRC transfer message includes an RRC connection establishment complete message.
  • the DU allows the UE's RRC connection establishment request in the access control. As shown in FIG. 3, if the DU rejects the RRC connection establishment request of the UE, the following steps are performed:
  • the UE sends an RRC connection establishment request to the DU.
  • the RRC connection establishment request includes reason information of the RRC connection establishment request initiated by the UE, such as emergency, high priority access, or access network notification area update. (RAN notification area update, RAN AU).
  • the DU rejects the RRC connection establishment request of the UE, and does not generate the configuration information of the protocol stack of the signaling radio bearer (SRB) 1 for the UE, such as the bottom layer.
  • Configuration information of the protocol stack includes configuration information of at least one of the protocol stacks of the RLC, MAC, or PHY.
  • Reasons for the DU to reject the UE may include: DU congestion, DU resource limitation, DU cell shutdown, DU channel conditions that do not allow the UE to be served or the air interface link fails, and so on.
  • the DU sends an initial uplink RRC message (initial UL RRC message) to the CU.
  • the CU After the CU receives the initial uplink RRC message sent by the DU, the CU confirms that the DU refuses UE access.
  • the method for the CU to confirm that the DU refuses UE access to the network includes: confirming that the second message does not include the DU RRC information, so the CU is The UE generates an RRC connection rejection message.
  • the CU sends an RRC connection rejection message to the DU.
  • the DU After receiving the RRC connection rejection message, the DU does not parse the RRC connection rejection message, and directly forwards the RRC connection rejection message to the UE. Therefore, in a high-priority event request scenario, such as an emergency call, the UE cannot establish an RRC connection.
  • the network side should ensure that the UE can access the network and get network services as much as possible.
  • the DU may refuse the UE to access the network after receiving the RRC connection establishment request sent by the UE.
  • the DU In the case of an emergency call, after the UE sends an RRC connection establishment request to the DU, the DU cannot resolve the RRC connection establishment request, and thus cannot know that the UE is making an emergency call. This causes the UE that initiated the emergency call to fail to access the network, which seriously affects network services. Quality cannot guarantee normal communication.
  • the embodiments of the present application provide the following solutions, so as to ensure normal communication.
  • FIG. 4 is a schematic flowchart of an RRC establishment method according to an embodiment of the present application. The method includes, but is not limited to, the following steps:
  • the UE sends an RRC connection establishment request (RRC connection request) to the DU.
  • the RRC connection establishment request may include first cause value information (cause value) of the RRC connection establishment request initiated by the UE, and the first cause value information may be emergency, high priority access, or access.
  • the DU After the DU receives the RRC connection establishment request sent by the UE, if the DU does not allow the UE to access the network, that is, the DU cannot provide services to the UE, the DU does not generate configuration information of the SRB1 protocol stack for the UE, such as the underlying protocol. Configuration information of the stack.
  • the configuration information of the underlying protocol stack includes configuration information of at least one of the protocol stacks of the RLC, MAC, or PHY.
  • the DU sends a first message to the CU, where the first message includes an RRC connection establishment request sent by the UE to the DU.
  • the first message may not include DU, CU, and RRC information.
  • the first message may be an initial uplink RRC message (initial UL RRC message transfer message).
  • the first message may further carry indication information, which is used to instruct the DU to refuse to receive the RRC connection establishment request.
  • the CU After the CU receives the first message sent by the DU, the CU confirms that the DU rejects the UE access.
  • the method for the CU to confirm that the DU rejects the UE access to the network includes: confirming that the second message does not include the DU RCU information.
  • the CU has an RRC protocol stack, and can obtain the first cause value information by analyzing the RRC connection establishment request in the first message, and according to the first cause value information, it is determined that the UE is allowed to establish an RRC connection. For example, if the first cause value information is urgent, the CU decides to provide services to the terminal. That is, even if the DU denies the UE access to the network, the CU can re-decide to let the UE access the network without fully accepting the DU's access control decision. Therefore, the CU generates an RRC connection establishment message for the UE, and the RRC connection establishment message It includes configuration information of the SRB1 protocol stack allocated by the CU to the UE, such as configuration information of a high-level protocol stack.
  • the configuration information of the high-level protocol stack may include PDCP configuration information.
  • the CU sends a second message to the DU.
  • the second message may include an RRC connection establishment message, and the RRC connection establishment message is used to instruct the UE to establish an RRC connection.
  • the second message may further include the first indication information.
  • the first indication information is used to instruct the DU to allow the UE to establish an RRC connection.
  • the first indication information may instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide a service for the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; Either suggest that the DU allows the UE to establish an RRC connection; or suggest that the DU provide services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on.
  • the second message may be a downlink RRC transfer message (DL RRC message transfer message).
  • the first indication information may be first cause value information, second cause value information, or indication value information.
  • the second cause value information may be generated according to the first cause value information in the first message or related to the first cause value information. For example, the first cause value is urgent, the second cause value is generated as an emergency call based on the first cause value, or the first cause value is urgent or high-priority access, and the second cause value is generated as High priority events.
  • the indication value information may be a specific numerical value, such as 0 or 1.
  • the indication value information is 1, instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide services to the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; or suggest that the DU allow the UE to establish an RRC connection Connect; or suggest that the DU provides services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on.
  • the indication value information is 0 or there is no indication value information
  • the DU may reject the RRC connection establishment request of the UE.
  • the indication value information may also indicate that the RRC connection establishment message included in the second message needs to be sent on SRB1. By indicating that the establishment of the RRC connection included in the second message needs to be sent on SRB1, in combination with the DU rejecting the UE from accessing the network in step S402, the DU confirms that the CU allows the UE to access the network.
  • the DU may send an RRC connection establishment message to the UE.
  • the RRC connection establishment message may include configuration information of the SRB1 protocol stack allocated by the CU to the UE. Since the DU denies the UE access to the network in step S402, there is no configuration information of the SRB1 protocol stack allocated for the UE, so the configuration information of the SRB1 protocol stack allocated by the DU for the UE may not be included.
  • the DU can still refuse to establish the RRC access network of the UE, for example, it is still congested and the service services are all emergency calls.
  • the DU may send a third message to the CU, where the third message includes second indication information, and the second indication information is used to instruct the DU to reject the UE from establishing an RRC connection.
  • the third message may also carry the reason why the DU refuses to establish an RRC connection by the UE. It can be understood that the DU may also be instructed by the message type information of the third message to refuse the UE to establish an RRC connection.
  • the UE After receiving the RRC connection establishment message, the UE configures the SRB1 of the UE, for example, the configuration information of PDCP, according to the configuration information of the SRB1 high-level protocol stack allocated by the CU to the UE in the RRC connection establishment message. In the case that the configuration information of the SRB1 underlying protocol stack is not included in the RRC connection establishment message, the UE may adopt the configuration information of the default SRB1 underlying protocol stack. After the configuration is complete, an RRC connection establishment complete message is sent to the DU.
  • the DU sends an uplink RRC transfer message (UL RRC message transfer message) to the CU.
  • the uplink RRC transfer message includes an RRC connection establishment complete message.
  • the DU first rejects the RRC connection establishment request of the UE, and the CU may determine to allow the UE to establish an RRC connection according to the reason value information, and send the indication information to the DU.
  • the indication information may instruct the DU to establish an RRC connection for the UE, or instruct the DU to provide services to the UE, or instruct the DU to allow the UE to access, or instruct the DU to allow the UE to establish an RRC connection, or suggest that the DU allows the UE to establish an RRC connection, or suggest that the DU be
  • the UE provides services; or instructs the CU to allow the UE to access, or instructs the CU to decide to provide services to the UE, and so on.
  • the DU accepts the UE to establish an RRC connection according to the instruction information, so that the UE can quickly access the network in a high-priority event request scenario, and ensure normal communication.
  • FIG. 5 is a schematic flowchart of another RRC establishment method according to an embodiment of the present application.
  • the steps in the embodiment of the present application include at least:
  • the UE sends a first request message to the DU.
  • the first request message may be an RRC connection establishment request, an RRC re-establishment request message, or an RRC resume request message.
  • the first request message includes first cause value information.
  • the first cause value information is a reason for the UE to initiate the first request message.
  • the first reason value information may be urgent, high-priority access, or update of the access network notification area. Since the DU does not have the RRC protocol stack, the DU cannot parse the first request message, and thus cannot obtain the first cause value information.
  • the DU After the DU receives the first request message sent by the UE, in some cases, for example, when congestion occurs in the DU, the DU does not allow the UE to access the network and rejects the first request message of the UE, that is, the DU cannot provide services to the UE. Then, the DU does not generate the configuration information of the protocol stack of SRB1 for the UE, such as the configuration information of the underlying protocol stack.
  • the configuration information of the underlying protocol stack includes configuration information of at least one of the protocol stacks of the RLC, MAC, or PHY.
  • the DU sends a second message to the CU, where the second message includes a first request message sent by the UE to the DU.
  • the second message does not include DU, CU, and RRC information.
  • the second message may be an initial uplink RRC transfer message (initial UL RRC message transfer message).
  • the CU After the CU receives the second message sent by the DU, the CU confirms that the DU denies the UE access to the network.
  • the method for the CU to confirm that the DU denies the UE from accessing the network includes: confirming that the second message does not include DU, CU, and RRC information.
  • the CU has an RRC protocol stack, and can obtain the first cause value information by parsing the first request message in the second message. With reference to the first cause value information, it is determined that the UE is allowed to establish an RRC connection. For example, if the first cause value information is urgent, the CU decides to provide services to the terminal. That is, even if the DU refuses the UE to access the network, the CU can re-determine the UE to access the network without fully accepting the DU's access control decision.
  • the CU sends a UE context establishment request to the DU.
  • the UE context establishment request may include an RRC connection establishment message, and the RRC connection establishment message is used to instruct the UE to establish an RRC connection.
  • the UE context establishment request may further include first indication information, where the first indication information is used to instruct the DU to allow the UE to establish an RRC connection.
  • the first indication information may instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide services for the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; Either suggest that the DU allows the UE to establish an RRC connection; or suggest that the DU provide services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on.
  • the first indication information may be first cause value information, second cause value information, or indication value information.
  • the second cause value information may be generated according to the first cause value information in the first request message or related to the first cause value information. For example, the first cause value is urgent, the second cause value is generated as an emergency call based on the first cause value, or the first cause value is urgent or high-priority access, and the second cause value is generated as High priority events.
  • the indication value information may be a specific numerical value, such as 0 or 1.
  • the indication value information is 1, instruct the DU to establish an RRC connection for the UE; or instruct the DU to provide services to the UE; or instruct the DU to allow the UE to access; or instruct the DU to allow the UE to establish an RRC connection; or suggest that the DU allow the UE to establish an RRC connection Connect; or suggest that the DU provides services for the UE; or instruct the CU to allow the UE to access; or instruct the CU to decide to provide services to the UE and so on.
  • the indication value information is 0 or there is no indication value information
  • the DU may reject the RRC connection establishment request of the UE.
  • the DU After the DU receives the UE context establishment request, if the DU determines that the UE is allowed to establish an RRC connection, the DU determines to provide services to the UE or determines to allocate corresponding resources to the UE. For example, the configuration information of the SRB1 underlying protocol stack is generated for the UE.
  • the DU sends a UE context establishment response to the CU.
  • the CU receives a UE context establishment response from the DU.
  • the DU can still refuse to establish the RRC access network of the UE.
  • the DU is still congested and the service services are all emergency calls.
  • the DU may send a UE context establishment failure message to the CU.
  • the UE context establishment failure message may also carry a reason why the DU refuses the UE to establish an RRC connection.
  • the CU sends a third message to the DU.
  • the third message includes a reply message of the first request message.
  • the reply message of the first request message may be an RRC connection establishment message, an RRC connection re-establishment message, or an RRC resume message.
  • the reply message of the first request message may include configuration information of the SRB1 high-level protocol stack allocated by the CU to the UE.
  • the reply message of the first request message may be an RRC connection rejection message.
  • the DU sends a reply message of the first request message to the UE.
  • the DU first rejects the UE ’s first request message.
  • the CU may determine that the UE is allowed to establish an RRC connection according to the cause value information, and send indication information to the DU through the UE context establishment request.
  • the indication information may indicate that the DU is The UE establishes an RRC connection, or instructs the DU to provide services to the UE, or instructs the DU to allow the UE to access, or instructs the DU to allow the UE to establish an RRC connection, or suggests that the DU allows the UE to establish an RRC connection; or recommends that the DU provide services to the UE, or instructs the CU Allow the UE to access, or instruct the CU to decide to provide services to the UE and so on.
  • the DU accepts the UE to establish an RRC connection according to the instruction information, so that the UE can quickly access the network in a high-priority event request scenario, and ensure normal communication.
  • FIG. 6 is a schematic flowchart of another RRC establishment method according to an embodiment of the present application. As shown in the figure, the steps in the embodiment of the present application include at least:
  • the UE sends a connection establishment request message to the DU.
  • the connection establishment request message may be an RRC connection establishment request, an RRC re-establishment request message, or an RRC resume request message.
  • the DU After receiving the connection establishment request message, the DU performs access control. If the DU rejects the connection establishment request message of the UE, the DU may allocate first timer information (wait timer) to the UE.
  • first timer information wait timer
  • the DU sends a first message to the CU.
  • the first message may include a UE sending a connection establishment request message to the DU, and may further include first timer information.
  • the first message does not include DU, CU, RRC, and Information.
  • the first message may be an initial uplink RRC message (initial UL RRC message transfer message).
  • the CU confirms that the DU denies the UE access to the network.
  • the CU confirming that the DU denies the UE access to the network includes: confirming by using a first message. For example, if the first message does not include DU, CU, and RRC information, it can be confirmed that the CU confirms that the DU denies the UE access to the network. Or the first message includes the first timer information, which can confirm that the CU confirms that the DU denies the UE access to the network.
  • the CU determines that the UE is refused to establish an RRC connection
  • the CU generates an RRC connection rejection message, and the RRC connection rejection message includes second timer information.
  • the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information, or the second timer information may be regenerated by the CU itself.
  • S605 When the CU determines that the UE is refused to establish an RRC connection, the CU sends a second message to the DU, where the second message includes second timer information.
  • the DU sends an RRC connection rejection message to the UE.
  • the RRC connection rejection message includes second timer information. After receiving the RRC connection rejection message, the UE starts the second timer information. The UE indicates in the second timer information After the specified time, the connection establishment request message is re-sent to the DU.
  • the DU rejects the connection establishment request message of the UE, but allocates timer information.
  • the CU After receiving the first message sent by the DU, the CU also rejects the connection establishment request message of the UE, and may send a second message to the DU.
  • the second message includes an RRC connection rejection message and timer information.
  • the DU forwards the RRC connection rejection message to the UE.
  • the UE After receiving the RRC connection rejection message, the UE can start the timer information, and after waiting for the time indicated by the timer information, resend the connection establishment request message to the DU. Enable the UE to access the network and ensure normal communication.
  • FIG. 7 is a schematic structural diagram of a central unit of an access network according to an embodiment of the present application.
  • the central unit may include a receiving module 701 and a sending module 702.
  • the detailed description of each module is as follows.
  • the receiving module 701 is configured to receive a first message sent by a distributed unit of the access network, where the first message includes first cause value information of a user unit UE sending an RRC connection establishment request to the distributed unit;
  • the sending module 702 is configured to send a second message to the distributed unit, where the second message includes an RRC connection establishment message and first indication information, where the first indication information is used to instruct the distributed unit to allow the The UE establishes an RRC connection.
  • the second message is a downlink RRC transmission message or a UE context establishment request message.
  • the first indication information is second cause value information or indication value information.
  • the second cause value information is related to the first cause value information, or the second cause value information is the same as the first cause value information.
  • the receiving unit 701 is further configured to receive a third message sent by the distributed unit, where the third message includes second indication information, and the second indication information is used to instruct the distributed unit to reject all The reason why the UE establishes an RRC connection is described.
  • the first cause value information is an emergency call, a high-priority access, or an access network notification area update.
  • the receiving module 701 is further configured to receive a first message sent by a distributed unit of the access network, where the first message includes first timer information, and the first timer information is used to indicate all The time when the distributed unit generates the user unit UE to resend the RRC connection establishment request; the sending module 702 is further configured to send a second message to the distributed unit, where the second message includes second timer information, and the first The second timer information is used to instruct the UE to resend the RRC connection establishment request time; wherein the second timer information is the same as the first timer information, or the second timer information is based on the first timer information.
  • a timer message is generated.
  • each module may also correspond to the corresponding description of the method embodiments shown in FIG. 4 to FIG. 6, and execute the methods and functions performed by the central unit described in the above embodiments.
  • FIG. 8 is a schematic structural diagram of a distributed unit of an access network according to an embodiment of the present application.
  • the distributed unit may include a sending module 801 and a receiving module 802. A detailed description of each module is as follows.
  • a sending module 801 is configured to send a first message to a central unit of the access network when the distributed unit of the access network rejects an RRC connection establishment request of the user unit UE, where the first message includes the RRC The first cause value information of the connection establishment request;
  • a receiving module 802 configured to receive the second message sent by the central unit, where the second message includes an RRC connection establishment message and first indication information, and the first indication information is used to indicate that the distributed unit allows The UE establishes an RRC connection.
  • the second message is a downlink RRC transmission message or a UE context establishment request message.
  • the first indication information is second cause value information or indication value information.
  • the second cause value information is related to the first cause value information, or the second cause value information is the same as the first cause value information.
  • the sending module 801 is further configured to send a third message to the central unit, where the third message includes second indication information, and the second indication information is used to instruct the distributed unit to reject the UE The reason for establishing the RRC connection.
  • the sending module 801 is further configured to send the RRC connection establishment message to the UE, where the RRC connection establishment message includes configuration information of a protocol stack of a signaling radio bearer allocated by the central unit to the UE. .
  • the first cause value information is an emergency call, a high-priority access, or an access network notification area update.
  • the sending module 801 is further configured to send a first message to a central unit of the access network, where the first message includes first timer information, and the first timer information is used to indicate the distribution.
  • the generation unit generates a time for the user unit UE to resend the RRC connection establishment request;
  • the receiving module 802 is further configured to receive the second message sent by the central unit, where the second message includes an RRC connection rejection message and a second timer Information; wherein the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information.
  • the sending module 801 is further configured to send an RRC connection rejection message to the UE.
  • the RRC connection rejection message includes second timer information, and the second timer information is used to instruct the UE to resend the RRC connection establishment request time.
  • each module may also correspond to the corresponding description of the method embodiments shown in FIG. 4 to FIG. 6, and execute the methods and functions performed by the distributed unit in the above embodiments.
  • FIG. 9 is a schematic structural diagram of a user unit according to an embodiment of the present application.
  • the user unit may include a receiving module 901, a sending module 902, and a processing module 903.
  • the detailed description of each module is as follows.
  • a sending module 901 configured to send an RRC connection establishment request to a distributed unit of an access network
  • the receiving module 902 is configured to receive an RRC connection establishment message sent by a distributed unit of the access network, where the RRC connection establishment message includes a configuration of a signaling radio bearer allocated by the central unit of the access network to the UE. Information, and the configuration information is used to instruct the UE to configure the signaling radio bearer.
  • the processing module 903 is configured to use the configuration information of the underlying protocol stack of the default signaling radio bearer when the configuration information of the underlying protocol stack of the signaling radio bearer is not included in the RRC connection establishment message.
  • the sending module 901 is further configured to send a connection establishment request message to the distributed unit of the access network; the receiving module 902 is further configured to receive an RRC connection reject message sent by the distributed unit, and the RRC connection reject message includes the second Timer information, and the second timer information is used to instruct the UE to resend the RRC connection establishment request time.
  • the sending module 901 is further configured to resend the RRC connection establishment request to the distributed unit after the time indicated by the second timer information.
  • each module may also correspond to the corresponding description of the method embodiments shown in FIG. 4 to FIG. 6, and execute the methods and functions performed by the user unit in the above embodiments.
  • FIG. 10 is a schematic structural diagram of another central unit provided by the present application.
  • the central unit may include: at least one processor 1001, at least one communication interface 1002, at least one memory 1003, and at least one communication bus 1004.
  • the processor 1001 may be a central processing unit, a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. It may implement or execute various exemplary logical blocks, modules, and circuits described in connection with the present disclosure.
  • the processor may also be a combination that implements computing functions, such as a combination including one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on.
  • the communication bus 1004 may be a peripheral component interconnect standard PCI bus or an extended industry standard structure EISA bus. The bus can be divided into an address bus, a data bus, a control bus, and the like.
  • the communication bus 1004 is used to implement connection and communication between these components.
  • the communication interface 1002 of the device in the embodiment of the present application is used to perform signaling or data communication with other node devices.
  • the memory 1003 may include volatile memory, such as nonvolatile dynamic random access memory (NVRAM), phase change random access memory (PRAM), magnetoresistive random access memory (magetoresistive RAM, MRAM), etc., may also include non-volatile memory, such as at least one disk storage device, electrically erasable programmable read-only memory (EEPROM), flash-memory (EEPROM), flash memory devices, such as flash memory (NOR flash memory) or anti-flash memory (NAND flash memory), semiconductor devices, such as solid state hard disk (solid state disk (SSD), etc.).
  • the memory 1003 may optionally be at least one storage device located far from the foregoing processor 1001.
  • a set of program code is stored in the memory 1003, and the processor 1001 executes a program executed by the above-mentioned central unit in the memory 1003.
  • the communication interface 1002 sends a second message to the distributed unit, where the second message includes an RRC connection establishment message and first indication information, and the first indication information is used to instruct the distributed unit to allow the UE to establish RRC connection.
  • the second message is a downlink RRC transmission message or a UE context establishment request message.
  • the first indication information is second cause value information or indication value information.
  • the second cause value information is related to the first cause value information, or the second cause value information is the same as the first cause value information.
  • processor 1001 is further configured to perform the following operations:
  • processor 1001 is further configured to perform the following operations:
  • the communication interface 1002 receives a third message sent by the distributed unit, where the third message includes second indication information, and the second indication information is used to instruct the distributed unit to reject the reason why the UE establishes an RRC connection.
  • the first cause value information is an emergency call, a high-priority access, or an access network notification area update.
  • processor 1001 is further configured to perform the following operations:
  • a first message sent by a distributed unit of the access network includes first timer information, and the first timer information is used to instruct the distributed unit to generate a user unit The time when the UE resends the RRC connection establishment request;
  • the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information.
  • processor may also cooperate with the memory and the communication interface to perform the operations of the above-mentioned central unit in the embodiments of the foregoing application.
  • the distributed unit may include: at least one processor 1101, at least one communication interface 1102, at least one memory 1103, and at least one communication bus 1104.
  • the processor 1101 may be various types of processors mentioned above.
  • the communication bus 1104 may be a peripheral component interconnect standard PCI bus or an extended industry standard structure EISA bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used in FIG. 11, but it does not mean that there is only one bus or one type of bus.
  • the communication bus 1104 is used to implement connection communication between these components.
  • the communication interface 1102 of the device in the embodiment of the present application is used to perform signaling or data communication with other node devices.
  • the memory 1103 may be various types of memories mentioned above.
  • the memory 1103 may optionally be at least one storage device located far from the foregoing processor 1101.
  • a set of program code is stored in the memory 1103, and the processor 1101 executes a program executed by the distributed unit in the memory 1103.
  • the communication interface 1102 sends a first message to the central unit of the access network, where the first message includes the RRC connection establishment request First cause value information;
  • the second message includes an RRC connection establishment message and first indication information
  • the first indication information is used to instruct the distributed unit to allow the The UE establishes an RRC connection.
  • the second message is a downlink RRC transmission message or a UE context establishment request message.
  • the first indication information is second cause value information or indication value information.
  • the second cause value information is related to the first cause value information, or the second cause value information is the same as the first cause value information.
  • processor 1101 is further configured to perform the following operations:
  • the RRC connection establishment message includes configuration information of a protocol stack of a signaling radio bearer allocated by the central unit to the UE.
  • processor 1101 is further configured to perform the following operations:
  • the first cause value information is an emergency call, a high-priority access, or an access network notification area update.
  • processor 1101 is further configured to perform the following operations:
  • the first message includes first timer information, and the first timer information is used to instruct the distributed unit to generate a user unit UE to restart The time when the RRC connection establishment request was sent;
  • the second timer information is the same as the first timer information, or the second timer information is generated based on the first timer information.
  • processor 1101 is further configured to perform the following operations:
  • An RRC connection rejection message is sent to the UE through the communication interface 1102.
  • the RRC connection rejection message includes second timer information, and the second timer information is used to instruct the UE to resend the RRC connection establishment request time.
  • processor may also cooperate with the memory and the communication interface to perform operations of the distributed unit in the foregoing application embodiment.
  • FIG. 12 is a schematic structural diagram of another subscriber unit provided by the present application.
  • the user unit may include: at least one processor 1201, at least one communication interface 1202, at least one memory 1203, and at least one communication bus 1204.
  • the processor 1201 may be various types of processors mentioned above.
  • the communication bus 1204 may be a peripheral component interconnect standard PCI bus or an extended industry standard structure EISA bus. The bus can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is used in FIG. 12, but it does not mean that there is only one bus or one type of bus.
  • the communication bus 1204 is used to implement connection and communication between these components.
  • the communication interface 1202 of the device in the embodiment of the present application is used to perform signaling or data communication with other node devices.
  • the memory 1203 may be various types of memories mentioned above.
  • the memory 1203 may optionally be at least one storage device located far from the foregoing processor 1201.
  • a set of program code is stored in the memory 1203, and the processor 1201 executes a program executed by the user unit in the memory 1203.
  • the RRC connection establishment message includes configuration information of a signaling radio bearer allocated by the central unit of the access network to the UE.
  • the configuration information is used to instruct the UE to configure the signaling radio bearer.
  • processor 1201 is further configured to perform the following operations:
  • the configuration information of the underlying protocol stack of the signaling radio bearer is not included in the RRC connection establishment message, the configuration information of the underlying protocol stack of the default signaling radio bearer is used.
  • processor 1201 is further configured to perform the following operations:
  • the RRC connection rejection message sent by the distributed unit is received through the communication interface 1202.
  • the RRC connection rejection message includes second timer information, and the second timer information is used to instruct the UE to resend the RRC connection establishment request time.
  • processor 1201 is further configured to perform the following operations:
  • the communication interface 1202 After the time indicated by the second timer information, the communication interface 1202 sends a RRC connection establishment request to the distributed unit again.
  • processor may also cooperate with the memory and the communication interface to perform operations of the user unit in the foregoing application embodiment.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the 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, for example, the computer instructions may be from a website site, computer, server, or data center Transmission by wire (for example, coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (for example, infrared, wireless, microwave, etc.) 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 a data storage device such as a server, a data center, and the like that includes one or more available medium integration.
  • the available 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, a solid state disk (SSD)).

Abstract

本申请实施例公开了一种无线资源控制RRC连接建立方法及相关设备，包括：接入网的中心单元接收所述接入网的分布式单元发送的第一消息，所述第一消息包括用户单元UE向所述分布式单元发送RRC连接建立请求的第一原因值信息；所述中心单元向所述分布式单元发送第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接，采用本申请实施例，实现在高优先级事件请求场景下UE快速接入网络，以期保障通信正常进行。

Description

一种无线资源控制RRC连接建立方法及相关设备 技术领域
本申请涉及无线网络技术领域，尤其涉及一种无线资源控制RRC连接建立方法及相关设备。
背景技术
对于接入网中的基站，例如5G基站(next generation base station，gNB)，按照协议栈功能可以将gNB拆分为两个部分：中心单元(central unit，CU)和分布式单元(distributed unit，DU)。其中，CU包含gNB的主要功能，如移动性管理和UE的无线资源控制(radio resource control，RRC)等功能，DU包含了CU以外的部分gNB功能，如媒体访问控制(media access control，MAC)协议栈功能和物理层(physical layer，PHY)协议栈功能。在这种网络架构下，如何保障通信正常进行，是一个值得考虑的问题。
发明内容
本申请实施例提供一种无线资源控制RRC连接建立方法，以期保障通信正常进行。
第一方面，本申请实施例提供了一种无线资源控制RRC连接建立方法，包括：接入网的中心单元首先接收接入网的分布式单元发送的第一消息，第一消息包括用户单元UE向分布式单元发送RRC连接建立请求的第一原因值信息；然后向分布式单元发送第二消息，第二消息包括RRC连接建立消息和第一指示信息，第一指示信息用于指示分布式单元允许UE建立RRC连接。通过第一指示信息指示DU允许UE接入网络，进而使得UE能够接入网络，以期保障通信正常进行。
在一种可能的设计中，CU接收到DU发送的第一消息之后，根据第一原因值信息，确定允许UE建立RRC连接。从而CU可以通过判断第一原因值信息确定是否允许UE快速接入网络。
在另一种可能的设计中，中心单元向分布式单元发送第二消息，包括：在中心单元确定分布式单元拒绝UE接入的情况下，中心单元向分布式单元发送第二消息。实现在DU拒绝UE接入的情况下CU可以通过发送第二消息指示DU允许UE接入网络。
在另一种可能的设计中，CU重新决定让UE接入网络，并不会完全接受DU的接入控制决定，因此CU为UE生成RRC连接建立消息，RRC连接建立消息中包括CU为UE分配的SRB1的协议栈的配置信息，例如高层协议栈的配置信息。高层协议栈的配置信息可以包括PDCP配置信息。从而在UE接收到RRC连接建立消息后建立RRC连接，并完成SRB1配置后接入网络。
在一种可能的设计中，第一原因值信息可以为紧急、高优先级接入或者接入网通知区更新，实现在多种场景下UE能够接入网络。
在另一种可能的设计中，第二消息为下行RRC传送消息或UE上下文建立请求消息。
在另一种可能的设计中，第一指示信息可以为第一原因值信息、第二原因值信息或指 示值信息。
在另一种可能的设计中，所述第二消息包括所述中心单元为所述UE分配的信令无线承载的高层协议栈的配置信息。从而UE可以根据该配置信息完成SRB1配置后接入网络。
在另一种可能的设计中，第一指示信息用于指示DU允许UE建立RRC连接。具体地，可以包括但不限于如下情形：该第一指示信息可以指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。从而DU可以根据第一指示信息重新确定是否允许UE接入网络。
在另一种可能的设计中，第二原因值信息可以是根据第一消息中的第一原因值信息生成的、或者与第一原因值信息相关。
在另一种可能的设计中，指示值信息可以为一个具体数值，例如0或1。例如，当指示值信息为1时，指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。当指示值信息为0、或者没有该指示值信息时，DU可以拒绝UE的RRC连接建立请求。从而DU可以根据指示值信息重新确定是否允许UE接入网络。
在另一种可能的设计中，指示值信息还可以指示第二消息中包含的RRC连接建立消息需要在SRB1上进行发送。通过指示第二消息中包含的RRC连接建立需要在SRB1上进行发送，DU确认CU允许UE接入网络。从而DU可以根据指示值信息重新确定是否允许UE接入网络。
在另一种可能的设计中，在DU接收到CU发送的第二消息之后，DU依然可以拒绝建立UE的RRC接入网络，例如依然拥塞，并且服务业务全部是紧急呼叫的情况。在这种情况下，CU可以接收DU发送的第三消息，该第三消息包括第二指示信息，第二指示信息用于指示DU拒绝UE建立RRC连接。从而使得CU可以重新考虑是否允许UE接入网络。
在另一种可能的设计中，第三消息中还可以携带DU拒绝UE建立RRC连接的原因。从而使得CU可以重新考虑是否允许UE接入网络。
第二方面，本申请实施例提供了一种无线资源控制RRC连接建立方法，包括：接入网的中心单元首先接收接入网的分布式单元发送的第一消息，第一消息包括第一定时器信息，第一定时器信息用于指示分布式单元生成用户单元UE重新发送RRC连接建立请求的时间；然后向分布式单元发送第二消息，第二消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间；其中，第二定时器信息与第一定时器信息相同，或第二定时器信息基于第一定时器信息生成。使得UE可以在等待第二定时器信息指示的时间后，重新发送RRC连接建立请求以便接入网络，以期保障通信正常进行。
在一种可能的设计中，在CU确定拒绝UE建立RRC连接的情况下，CU生成RRC连接拒绝消息，该RRC连接拒绝消息中包括第二定时器信息。从而使得UE可以在接收 到RRC连接拒绝消息，重新发送RRC连接建立请求以便接入网络，以期保障通信正常进行。
在另一种可能的设计中，CU确认DU拒绝UE接入网络，包括：通过第一消息进行确认。例如，第一消息中不包括DU to CU RRC information，即可确认CU确认DU拒绝UE接入网络。或者第一消息中包括第一定时器信息，即可确认CU确认DU拒绝UE接入网络。
第三方面，本申请实施例提供了一种无线资源控制RRC连接建立方法，包括：在接入网的分布式单元拒绝用户单元UE的RRC连接建立请求的情况下，分布式单元首先向接入网的中心单元发送第一消息，第一消息包括RRC连接建立请求的第一原因值信息；然后接收中心单元发送的第二消息，第二消息包括RRC连接建立消息和第一指示信息，第一指示信息用于指示分布式单元允许UE建立RRC连接。通过第一指示信息指示DU允许UE接入网络，进而使得UE能够接入网络，以期保障通信正常进行。
在一种可能的设计中，分布式单元接收中心单元发送的第二消息，包括：在中心单元确定分布式单元拒绝UE接入的情况下，分布式单元接收中心单元发送的第二消息。实现在DU拒绝UE接入的情况下，重新确定是否允许UE接入网络。
在另一种可能的设计中，分布式单元接收中心单元发送的第二消息之后，分布式单元向UE发送RRC连接建立消息，RRC连接建立消息包括中心单元为UE分配的信令无线承载的协议栈的配置信息。从而在UE接收到RRC连接建立消息后建立RRC连接，并完成SRB1配置后接入网络。
在另一种可能的设计中，第一原因值信息可以为紧急、高优先级接入或者接入网通知区更新。
在另一种可能的设计中，第二消息为下行RRC传送消息或UE上下文建立请求消息。
在另一种可能的设计中，第二消息包括中心单元为UE分配的信令无线承载的高层协议栈的配置信息。从而UE可以根据该配置信息完成SRB1配置后接入网络。
在另一种可能的设计中，第一指示信息可以为第一原因值信息、第二原因值信息或指示值信息。
在另一种可能的设计中，第一指示信息用于指示DU允许UE建立RRC连接。具体地，可以包括但不限于如下情形：该第一指示信息可以指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。从而DU可以根据第一指示信息重新确定是否允许UE接入网络。
在另一种可能的设计中，第二原因值信息可以是根据第一消息中的第一原因值信息生成的、或者与第一原因值信息相关。
在另一种可能的设计中，指示值信息可以为一个具体数值，例如0或1。例如，当指示值信息为1时，指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU 决定为UE提供服务等等。当指示值信息为0、或者没有该指示值信息时，DU可以拒绝UE的RRC连接建立请求。从而DU可以根据指示值信息重新确定是否允许UE接入网络。
在另一种可能的设计中，指示值信息还可以指示第二消息中包含的RRC连接建立消息需要在SRB1上进行发送。通过指示第二消息中包含的RRC连接建立需要在SRB1上进行发送，DU认为CU允许UE接入网络。从而DU可以根据指示值信息重新确定是否允许UE接入网络。
在另一种可能的设计中，在DU接收到CU发送的第二消息之后，DU依然可以拒绝建立UE的RRC接入网络，例如依然拥塞，并且服务业务全部是紧急呼叫的情况。在这种情况下，DU可以向CU发送第三消息，该第三消息包括第二指示信息，第二指示信息用于指示DU拒绝UE建立RRC连接。
第四方面，本申请实施例提供了一种无线资源控制RRC连接建立方法，包括：接入网的分布式单元首先向接入网的中心单元发送第一消息，第一消息包括第一定时器信息，第一定时器信息用于指示分布式单元生成用户单元UE重新发送RRC连接建立请求的时间；然后接收中心单元发送的第二消息，第二消息包括RRC连接拒绝消息和第二定时器信息；其中，第二定时器信息与第一定时器信息相同，或第二定时器信息基于第一定时器信息生成。使得UE可以在等待第二定时器信息指示的时间后，重新发送RRC连接建立请求以便接入网络，以期保障通信正常进行。
在一种可能的设计中，分布式单元接收中心单元发送的第二消息之后，向UE发送RRC连接拒绝消息，RRC连接拒绝消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间。从而使得UE可以在接收到RRC连接拒绝消息，重新发送RRC连接建立请求接入网络，以期保障通信正常进行。
在另一种可能的设计中，该连接建立请求消息可以为RRC连接建立请求，也可以是RRC重建立请求消息，还可以是RRC恢复请求消息。
第五方面，本申请实施例提供了一种无线资源控制RRC连接建立方法，包括：用户单元UE向接入网的分布式单元发送RRC连接建立请求；UE接收分布式单元发送的RRC连接建立消息，RRC连接建立消息包括接入网的中心单元为UE分配的信令无线承载的配置信息，配置信息用于指示UE配置信令无线承载。从而UE可以根据该配置信息完成SRB1配置后接入网络，以期保障通信正常进行。
在一种可能的设计中，配置信息不包括DU为UE分配的信令无线承载的配置信息。
在另一种可能的设计中，UE接收到RRC连接建立消息之后，根据RRC连接建立消息中的CU为该UE分配的SRB1高层协议栈的配置信息配置UE的SRB1，例如PDCP协议栈的配置信息。在RRC连接建立消息中没有信令无线承载的底层协议栈的配置信息的情况下，UE使用默认的信令无线承载的底层协议栈的配置信息。从而UE可以根据该配置信息完成SRB1配置后接入网络。
在另一种可能的设计中，UE接收分布式单元发送的RRC连接建立消息，完成配置后，向DU发送RRC连接建立完成消息。从而通知DU所述RRC连接建立完成。
第六方面，本申请实施例提供了一种无线资源控制RRC连接建立方法，包括：UE向接入网的分布式单元发送连接建立请求消息；然后接收分布式单元发送的RRC连接拒 绝消息，RRC连接拒绝消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间。从而UE可以在等待第二定时器信息指示的时间后，重新发送RRC连接建立请求以便接入网络，以期保障通信正常进行。
在一种可能的设计中，UE在第二定时器信息所指示的时间后，重新向分布式单元发送RRC连接建立请求。实现UE能够重新接入网络，以期保障通信正常进行。
在另一种可能的设计中，在用户单元UE向接入网的分布式单元发送连接建立请求消息之后，如果DU拒绝UE的连接建立请求消息，DU为UE分配第一定时器信息。其中，第二定时器信息与第一定时器信息相同，或第二定时器信息基于第一定时器信息生成，第一定时器信息用于指示分布式单元生成的用户单元UE重新发送RRC连接建立请求的时间。
在另一种可能的设计中，连接建立请求消息可以为RRC连接建立请求，也可以是RRC重建立请求消息，还可以是RRC恢复请求消息。
第七方面，本申请实施例提供了一种接入网的中心单元，该中心单元被配置为实现上述第一方面和第二方面中的中心单元所执行的方法和功能，由硬件/软件实现，其硬件/软件包括与上述功能相应的模块。
第八方面，本申请实施例提供了一种接入网的分布式单元，该分布式单元被配置为实现上述第三方面和第四方面中的分布式单元所执行的方法和功能，由硬件/软件实现，其硬件/软件包括与上述功能相应的模块。
第九方面，本申请实施例提供了一种用户单元，该用户单元被配置为实现上述第五方面和第六方面中的用户单元所执行的方法和功能，由硬件/软件实现，其硬件/软件包括与上述功能相应的模块。
第十方面，本申请实施例提供了另一种中心单元，包括：处理器和存储器，处理器执行存储器中存储的程序用于实现上述第一方面和第二方面提供的一种无线资源控制RRC连接建立方法中的步骤。
在一种可能的设计中，本申请实施例提供的中心单元还包括通信总线，通信总线用于实现处理器和存储器之间连接通信。
在另一个可能的设计中，本申请实施例提供的中心单元可以包含用于执行上述方法设计中的中心单元行为相对应的模块。模块可以是软件和/或是硬件。
第十一方面，本申请实施例提供了另一种分布式单元，包括：处理器和存储器，处理器执行存储器中存储的程序用于实现上述第三方面和第四方面提供的一种无线资源控制RRC连接建立方法中的步骤。
在一种可能的设计中，本申请实施例提供的分布式单元还包括通信总线，通信总线用于实现处理器和存储器之间连接通信。
在另一个可能的设计中，本申请实施例提供的分布式单元可以包含用于执行上述方法设计中的分布式单元行为相对应的模块。模块可以是软件和/或是硬件。
第十二方面，本申请实施例提供了另一种用户单元，包括：处理器和存储器，处理器执行存储器中存储的程序用于实现上述第三面提供的一种无线资源控制RRC连接建立方法中的步骤。
在一种可能的设计中，本申请实施例提供的用户单元还包括通信总线，通信总线用于实现处理器和存储器之间连接通信。
在另一个可能的设计中，本申请实施例提供的用户单元可以包含用于执行上述方法设计中的用户单元行为相对应的模块。模块可以是软件和/或是硬件。
第十三方面，本申请提供了一种计算机可读存储介质，计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述各方面的方法。
第十四方面，本申请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，使得计算机执行上述各方面的方法。
附图说明
为了更清楚地说明本申请实施例或背景技术中的技术方案，下面将对本申请实施例或背景技术中所需要使用的附图进行说明。
图1是本申请实施例提供的一种接入网系统的架构示意图；
图2是本申请实施例提供的一种RRC连接初始建立方法的流程示意图；
图3是本申请实施例提供的另一种RRC连接初始建立方法的流程示意图；
图4是本申请实施例提供的一种RRC建立方法的流程示意图；
图5是本申请实施例提供的另一种RRC建立方法的流程示意图；
图6是本申请实施例提供的另一种RRC建立方法的流程示意图；
图7是本申请实施例提供的一种接入网的中心单元的结构示意图；
图8是本申请实施例提供的一种接入网的分布式单元的结构示意图；
图9是本申请实施例提供的一种用户单元的结构示意图；
图10是本申请实施例提出的另一种中心单元的结构示意图；
图11是本申请实施例提出的另一种分布式单元的结构示意图；
图12是本申请实施例提出的另一种用户单元的结构示意图。
具体实施方式
下面结合本申请实施例中的附图对本申请实施例进行描述。
请参见图1图1是本申请实施例提供的一种网络系统的架构示意图，该网络系统包括用户单元(user equipment，UE)和接入网。其中，接入网可以包括基站。例如，5G基站(next generation base station，gNB)、接入点、节点B或演进型节点(environment bureau，eNB)等等。按照协议栈功能可以将gNB拆分为两个部分：CU和DU。CU和DU都是一个逻辑节点，CU可以包括服务数据协议栈(Service Data Protocol，SDAP)、分组数据汇聚协议(packet data convergence protocol，PDCP)和无线资源控制(radio resource control，RRC)等协议栈实体，DU包括媒体访问控制(media access control，MAC)、物理层(physical layer，PHY)和无线链路控制层协议(radio link control，RLC)等协议栈实体。可以理解的是，CU和DU的功能划分还可以是其他的形式，例如CU可以包括服务数据协议栈(service data protocol，SDAP)、分组数据汇聚协议(packet data convergence protocol，PDCP)、无线链路控制层协议(radio link control，RLC)和无线资源控制(radio resource  control，RRC)等协议栈实体，DU包括媒体访问控制(media access control，MAC)和物理层(physical layer，PHY)等协议栈实体。
一个gNB可以包括一个CU和多个DU，CU和DU之间通过接口连接，在本申请中称为F1接口，一个CU可以连接多个DU。用户单元可以是指提供到用户的语音和/或数据连接的设备，也可以被连接到诸如膝上型计算机或台式计算机等的计算设备，或者其可以是诸如个人数字助理(personal digital assistant，PDA)等的独立设备。用户单元还可以为站点(station，STA)、系统、用户站、移动站、移动台、远程站、接入点、远程终端、接入终端、用户终端、用户代理或用户装置。接入网指在空中接口上通过一个或多个扇区与无线终端进行通信的接入网络中的设备。
请参考图2，图2是本申请实施例提供的一种RRC连接初始建立方法的流程示意图。如图所示，至少包括如下步骤：
S201，UE向DU发送RRC连接建立请求(RRC connection request)。
S202，DU接收到RRC连接建立请求之后进行接入控制，如果DU允许UE接入网络，则为该UE生成信令无线承载(radio access bearer，SRB)1的协议栈的配置信息，例如底层协议栈的配置信息。底层协议栈的配置信息包括RLC、MAC、或PHY的协议栈中至少一个的配置信息，并且将该配置信息放在一个F1接口的信元中，在本申请中称之为DU到CU的RRC信息(DU to CU RRC Information)信元，最后向CU发送初始上行RRC传送消息(initial UL RRC message transfer message)，该初始上行RRC传送消息包括DU to CU RRC information。
S203，CU接收到初始上行RRC消息之后，如果该初始上行RRC传送消息中包括DU to CU RRC information，则确认DU已经允许UE接入网络，如果CU也允许UE接入网络，则生成RRC连接建立消息，包括CU为UE分配的SRB1的协议栈的配置信息，例如高层协议栈的配置信息。高层协议栈的配置信息可以包括PDCP配置信息。RRC连接建立消息中还可以包括DU to CU RRC information中的DU为该UE分配的SRB1的协议栈的配置信息。最后CU向DU发送下行RRC传送消息(DL RRC message transfer message)，该下行RRC传送消息包括RRC连接建立消息。
S204，DU接收到CU发送的下行RRC传送消息之后，向UE发送RRC连接建立消息。
S205，UE接收到RRC连接建立消息之后，根据RRC连接建立消息中的CU为该UE分配的SRB1高层协议栈配置信息和DU为该UE分配的SRB1底层协议栈的配置信息，配置UE的SRB1。UE在配置SRB1完成后，向DU发送RRC连接建立完成消息。
S206，DU向CU发送上行RRC传送消息(UL RRC message transfer message)，该上行RRC传送消息包括RRC连接建立完成消息。
在上述RRC连接初始建立的步骤中，DU在接入控制中允许UE的RRC连接建立请求。如图3所示，如果DU拒绝UE的RRC连接建立请求，则执行如下步骤：
S301，UE向DU发送RRC连接建立请求，该RRC连接建立请求包括UE发起RRC连接建立请求原因值信息，例如紧急(emergency)、高优先级接入(high priority access) 或者接入网通知区更新(RAN notification area update，RAN AU)。
S302，DU接收到UE发送的RRC连接建立请求之后，DU拒绝UE的RRC连接建立请求，则不为该UE生成信令无线承载(radio access bearer，SRB)1的协议栈的配置信息，例如底层协议栈的配置信息。底层协议栈的配置信息包括RLC、MAC、或PHY的协议栈中至少一个的配置信息。DU拒绝UE的原因可以包括：DU发生拥塞、DU资源受限、DU小区关闭、DU信道条件不允许服务UE或空口链路失败等等。
S303，DU向CU发送初始上行RRC消息(initial UL RRC message)。
S304，CU接收到DU发送的初始上行RRC消息之后，CU确认DU拒绝UE接入，CU确认DU拒绝UE接入网络的方法包括：确认第二消息中不包括DU to CU RRC information，因此CU为UE生成RRC连接拒绝消息。
S305，CU向DU发送RRC连接拒绝消息。
S306，DU接收到RRC连接拒绝消息之后，不对该RRC连接拒绝消息进行解析，直接向UE转发RRC连接拒绝消息。因此在高优先级事件请求场景下，例如紧急呼叫，UE无法建立RRC连接。
在高优先级事件请求场景(例如紧急呼叫)，网络侧应该尽可能保证UE能够接入网络并得到网络服务。但是，由于DU可能会出现拥塞，DU接收到UE发送的RRC连接建立请求后可能会拒绝UE接入网络。在紧急呼叫情况下，UE向DU发送RRC连接建立请求之后，由于DU并不能解析RRC连接建立请求，进而无法获知UE正在紧急呼叫，这样导致发起紧急呼叫的UE不能接入网络，严重影响网络服务质量，不能保障通信正常进行。本申请实施例提供了如下解决方案，以期保障通信正常进行。
请参见图4，图4是本申请实施例提供的一种RRC建立方法的流程示意图，该方法包括但不限于如下步骤：
S401，UE向DU发送RRC连接建立请求(RRC connection request)。该RRC连接建立请求可以包括UE发起RRC连接建立请求的第一原因值信息(cause value)，该第一原因值信息可以为紧急(emergency)、高优先级接入(high priority access)或者接入网通知区更新(RAN notification area update，RANAU)等等。由于DU没有RRC协议栈，因此DU无法解析RRC连接建立请求消息，从而无法够获知第一原因值信息。
S402，DU接收到UE发送的RRC连接建立请求之后，如果DU不允许UE接入网络，即DU不能为UE提供服务，则DU不会为该UE生成SRB1的协议栈的配置信息，例如底层协议栈的配置信息。底层协议栈的配置信息包括RLC、MAC、或PHY的协议栈中至少一个的配置信息。
S403，DU向CU发送第一消息，该第一消息包括UE向DU发送的RRC连接建立请求。第一消息中可以不包括DU to CU RRC information。该第一消息可以为初始上行RRC消息(initial UL RRC message transfer message)。可选的，第一消息还可以携带指示信息，该指示信息用于指示DU拒绝接收RRC连接建立请求。
S404，CU接收到DU发送的第一消息之后，CU确认DU拒绝UE接入，CU确认DU拒绝UE接入网络的方法包括：确认第二消息中不包括DU to CU RRC information。
CU具有RRC协议栈，可以通过解析第一消息中的RRC连接建立请息获取第一原因值信息，根据第一原因值信息，确定允许所述UE建立RRC连接。例如第一原因值信息为紧急，则CU决定为终端提供服务。也即，即使DU拒绝UE接入网络，CU也可以重新决定让UE接入网络，而并不会完全接受DU的接入控制决定，因此CU为UE生成RRC连接建立消息，该RRC连接建立消息中包括CU为UE分配的SRB1的协议栈的配置信息，例如高层协议栈的配置信息。高层协议栈的配置信息可以包括PDCP配置信息。
S405，CU向DU发送第二消息。第二消息可以包括RRC连接建立消息，RRC连接建立消息用于指示UE建立RRC连接。第二消息还可以包括第一指示信息。第一指示信息用于指示DU允许UE建立RRC连接。具体地，可以包括但不限于如下情形：该第一指示信息可以指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。该第二消息可以为下行RRC传送消息(DL RRC message transfer message)。
其中，所述第一指示信息可以为第一原因值信息、第二原因值信息或指示值信息。第二原因值信息可以是根据第一消息中的第一原因值信息生成的、或者与第一原因值信息相关。例如，第一原因值为紧急，第二原因值基于该第一原因值生成为紧急呼叫，或者第一原因值为紧急或者高优先级接入，第二原因值基于该第一原因值生成为高优先级事件。另外，指示值信息可以为一个具体数值，例如0或1。例如，当指示值信息为1时，指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。当指示值信息为0、或者没有该指示值信息时，DU可以拒绝UE的RRC连接建立请求。指示值信息还可以指示第二消息中包含的RRC连接建立消息需要在SRB1上进行发送。通过指示第二消息中包含的RRC连接建立需要在SRB1上进行发送，结合在步骤S402中DU拒绝UE接入网络，DU确认CU允许UE接入网络。
S406，DU接收到第二消息之后，如果确定允许UE建立RRC连接，可以向UE发送RRC连接建立消息。该RRC连接建立消息可以包括CU为UE分配的SRB1的协议栈的配置信息。由于步骤S402中DU拒绝UE接入网络，没有为UE分配的SRB1的协议栈的配置信息，因此可以不包括DU为该UE分配的SRB1协议栈的配置信息。
可选的，在DU接收到CU发送的第二消息之后，DU依然可以拒绝建立UE的RRC接入网络，例如依然拥塞，并且服务业务全部是紧急呼叫的情况。在这种情况下，DU可以向CU发送的第三消息，该第三消息包括第二指示信息，所述第二指示信息用于指示DU拒绝所述UE建立RRC连接。可选的，第三消息中还可以携带DU拒绝所述UE建立RRC连接的原因。可以理解，也可以通过第三消息的消息类型信息指示DU拒绝所述UE建立RRC连接。
S407，UE接收到RRC连接建立消息之后，根据RRC连接建立消息中的CU为该UE分配的SRB1高层协议栈的配置信息来配置UE的SRB1，例如PDCP的配置信息。在 RRC连接建立消息中没有SRB1底层协议栈的配置信息的情况下，UE可以采用默认的SRB1的底层协议栈的配置信息。在配置完成后，向DU发送RRC连接建立完成消息。
S408，DU向CU发送上行RRC传送消息(UL RRC message transfer message)，该上行RRC传送消息包括RRC连接建立完成消息。
在本申请实施例中，DU首先拒绝UE的RRC连接建立请求，CU可以根据原因值信息，确定允许UE建立RRC连接，并向DU发送指示信息。该指示信息可以指示DU为UE建立RRC连接，或者指示DU为UE提供服务，或者指示DU允许UE接入，或者指示DU允许UE建立RRC连接，或者建议DU允许UE建立RRC连接，或者建议DU为UE提供服务；或者指示CU允许UE接入，或者指示CU决定为UE提供服务等等。最后DU根据指示信息接受UE建立RRC连接，实现在高优先级事件请求场景下UE快速接入网络，保障通信正常进行。
如图5所示，图5是本申请实施例提供的另一种RRC建立方法的流程示意图。本申请实施例的步骤至少包括：
S501，UE向DU发送第一请求消息。该第一请求消息可以为RRC连接建立请求(RRC connection request)，也可以是RRC重建立请求消息，还可以是RRC恢复请求消息。该第一请求消息包括第一原因值信息。第一原因值信息是UE发起第一请求消息的原因。该第一原因值信息可以为紧急，高优先级接入或者接入网通知区更新等等。由于DU没有RRC协议栈，因此DU无法解析第一请求消息，从而无法够获知第一原因值信息。
S502，DU接收到UE发送的第一请求消息之后，在某些情况下，例如DU发生拥塞时，DU不允许UE接入网络，拒绝UE的第一请求消息，即DU不能为UE提供服务。则DU不会为该UE生成SRB1的协议栈的配置信息，例如底层协议栈的配置信息。底层协议栈的配置信息包括RLC、MAC、或PHY的协议栈中至少一个的配置信息。
S503，DU向CU发送第二消息，该第二消息包括UE向DU发送的第一请求消息。该第二消息不包括DU to CU RRC information。该第二消息可以为初始上行RRC传送消息(initial UL RRC message transfer message)。
S504，CU接收到DU发送的第二消息之后，CU确认DU拒绝UE接入网络。CU确认DU拒绝UE接入网络的方法包括：确认第二消息中不包括DU to CU RRC information。
CU具有RRC协议栈，可以通过解析第二消息中的第一请求消息获取第一原因值信息。参考第一原因值信息，确定允许UE建立RRC连接。例如，所述第一原因值信息为紧急，则CU决定为终端提供服务。也即，即使DU拒绝UE接入网络，CU也可以重新决定让UE接入网络，而并不会完全接受DU的接入控制决定。
S505，CU向DU发送UE上下文建立请求。该UE上下文建立请求可以包括RRC连接建立消息，RRC连接建立消息用于指示UE建立RRC连接。该UE上下文建立请求还可以包括第一指示信息，第一指示信息用于指示DU允许UE建立RRC连接。具体地，可以包括但不限于如下情形：该第一指示信息可以指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。
其中，所述第一指示信息可以为第一原因值信息、第二原因值信息或指示值信息。第二原因值信息可以是根据第一请求消息中的第一原因值信息生成的、或者与第一原因值信息相关。例如，第一原因值为紧急，第二原因值基于该第一原因值生成为紧急呼叫，或者第一原因值为紧急或者高优先级接入，第二原因值基于该第一原因值生成为高优先级事件。另外，指示值信息可以为一个具体数值，例如0或1。例如，当指示值信息为1时，指示DU为UE建立RRC连接；或者指示DU为UE提供服务；或者指示DU允许UE接入；或者指示DU允许UE建立RRC连接；或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务；或者指示CU允许UE接入；或者指示CU决定为UE提供服务等等。当指示值信息为0、或者没有该指示值信息时，DU可以拒绝UE的RRC连接建立请求。
S506，DU接收到UE上下文建立请求之后，如果DU确定允许UE建立RRC连接，则DU确定为UE提供服务或者确定为UE分配相应的资源。例如为UE生成SRB1底层协议栈的配置信息。
S507，DU向CU发送UE上下文建立响应。CU接收来自DU的UE上下文建立响应。
可以理解的是，在DU接收到CU发送的UE上下文建立请求之后，DU依然可以拒绝建立UE的RRC接入网络，例如，DU依然拥塞，并且服务业务全部是紧急呼叫的情况。DU可以向CU发送UE上下文建立失败消息。可选的，该UE上下文建立失败消息中还可以携带DU拒绝所述UE建立RRC连接的原因。
S508，CU向DU发送第三消息。该第三消息中包含第一请求消息的回复消息。在DU确定为UE提供服务的场景下，该第一请求消息的回复消息可以是RRC连接建立消息，也可以是RRC连接重建立消息，还可以是RRC恢复消息。可选的，该第一请求消息的回复消息可以包括CU为UE分配的SRB1高层协议栈的配置信息。在DU确定拒绝为UE提供服务的场景下，该第一请求消息的回复消息可以是RRC连接拒绝消息。
S509，DU向UE发送第一请求消息的回复消息。
在本申请实施例中，DU首先拒绝UE的第一请求消息，CU可以根据原因值信息，确定允许UE建立RRC连接，并通过UE上下文建立请求向DU发送指示信息，该指示信息可以指示DU为UE建立RRC连接，或者指示DU为UE提供服务，或者指示DU允许UE接入，或者指示DU允许UE建立RRC连接，或者建议DU允许UE建立RRC连接；或者建议DU为UE提供服务，或者指示CU允许UE接入，或者指示CU决定为UE提供服务等等。最后DU根据指示信息接受UE建立RRC连接，实现在高优先级事件请求场景下UE快速接入网络，保障通信正常进行。
请参考图6，图6是本申请实施例提供的另一种RRC建立方法的流程示意图。如图所示，本申请实施例的步骤至少包括：
S601，UE向DU发送连接建立请求消息。该连接建立请求消息可以为RRC连接建立请求，也可以是RRC重建立请求消息，还可以是RRC恢复请求消息。
S602，DU接收到连接建立请求消息之后进行接入控制，如果DU拒绝UE的连接建立请求消息，DU可以为UE分配第一定时器信息(wait timer)。
S603，DU向CU发送第一消息，第一消息可以包括UE向DU发送连接建立请求消息，还可以包括第一定时器信息。第一消息不包括DU to CU RRC Information。其中，该第一消息可以为初始上行RRC消息(initial UL RRC message transfer message)。
S604，CU接收到DU发送的第一消息之后，CU确认DU拒绝UE接入网络。CU确认DU拒绝UE接入网络，包括：通过第一消息进行确认。例如，第一消息中不包括DU to CU RRC information，即可确认CU确认DU拒绝UE接入网络。或者第一消息中包括第一定时器信息，即可确认CU确认DU拒绝UE接入网络。
在CU确定拒绝UE建立RRC连接的情况下，CU生成RRC连接拒绝消息，该RRC连接拒绝消息中包括第二定时器信息。其中，所述第二定时器信息与第一定时器信息相同，或所述第二定时器信息基于所述第一定时器信息生成，或者第二定时器信息还可以由CU自己重新生成。
S605，在CU确定拒绝UE建立RRC连接的情况下，CU向DU发送第二消息，所述第二消息包括第二定时器信息。
S606，DU向UE发送RRC连接拒绝消息，该RRC连接拒绝消息包括第二定时器信息，UE接收到RRC连接拒绝消息之后，启动第二定时器信息，UE在所述第二定时器信息所指示的时间后，重新向DU发送连接建立请求消息。
在本申请实施例中，在UE向DU发送连接建立请求消息之后，DU拒绝UE的连接建立请求消息，但是分配一个定时器信息。CU接收到DU发送的第一消息之后，也拒绝UE的连接建立请求消息，可以向DU发送第二消息，该第二消息包括RRC连接拒绝消息和定时器信息。DU将RRC连接拒绝消息转发给UE，UE接收到RRC连接拒绝消息之后，可以启动该定时器信息，在等待定时器信息所指示的时间后，重新向DU发送连接建立请求消息。使得UE能够接入网络，保障通信正常进行。
上述详细阐述了本申请实施例的方法，下面提供了本申请实施例的装置。
请参见图7，图7是本申请实施例提供的一种接入网的中心单元的结构示意图，该中心单可以包括接收模块701以及发送模块702，其中，各个模块的详细描述如下。
接收模块701，用于接收所述接入网的分布式单元发送的第一消息，所述第一消息包括用户单元UE向所述分布式单元发送RRC连接建立请求的第一原因值信息；
发送模块702，用于向所述分布式单元发送第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
其中，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
其中，所述第一指示信息为第二原因值信息或指示值信息。
其中，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
可选的，接收单元701，还用于接收所述分布式单元发送的第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
其中，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
可选的，接收模块701，还用于接收所述接入网的分布式单元发送的第一消息，所述第一消息包括第一定时器信息，所述第一定时器信息用于指示所述分布式单元生成用户单元UE重新发送RRC连接建立请求的时间；发送模块702，还用于向所述分布式单元发送第二消息，所述第二消息包括第二定时器信息，所述第二定时器信息用于指示所述UE重新发送所述RRC连接建立请求的时间；其中，所述第二定时器信息与第一定时器信息相同，或所述第二定时器信息基于所述第一定时器信息生成。
需要说明的是，各个模块的实现还可以对应参照图4至图6所示的方法实施例的相应描述，执行上述实施例所述的中心单元所执行的方法和功能。
请参见图8，图8是本申请实施例提供的一种接入网的分布式单元的结构示意图，该分布式单元可以包括发送模块801和接收模块802，其中，各个模块的详细描述如下。
发送模块801，用于在接入网的分布式单元拒绝用户单元UE的RRC连接建立请求的情况下，向所述接入网的中心单元发送第一消息，所述第一消息包括所述RRC连接建立请求的第一原因值信息；
接收模块802，用于接收所述中心单元发送的所述第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
其中，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
其中，所述第一指示信息为第二原因值信息或指示值信息。
其中，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
可选的，发送模块801，还用于向所述中心单元发送第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
可选的，发送模块801，还用于向所述UE发送所述RRC连接建立消息，所述RRC连接建立消息包括所述中心单元为所述UE分配的信令无线承载的协议栈的配置信息。
其中，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
可选的，发送模块801，还用于向所述接入网的中心单元发送第一消息，所述第一消息包括第一定时器信息，所述第一定时器信息用于指示所述分布式单元生成用户单元UE重新发送RRC连接建立请求的时间；接收模块802，还用于接收所述中心单元发送的所述第二消息，所述第二消息包括RRC连接拒绝消息和第二定时器信息；其中，所述第二定时器信息与第一定时器信息相同，或所述第二定时器信息基于所述第一定时器信息生成。
发送模块801，还用于向UE发送RRC连接拒绝消息，RRC连接拒绝消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间。
需要说明的是，各个模块的实现还可以对应参照图4至图6所示的方法实施例的相应描述，执行上述实施例中分布式单元所执行的方法和功能。
请参见图9，图9是本申请实施例提供的一种用户单元的结构示意图，该用户单元可 以包括接收模块901、发送模块902以及处理模块903，其中，各个模块的详细描述如下。
发送模块901，用于向接入网的分布式单元发送RRC连接建立请求；
接收模块902，用于接收所述接入网的分布式单元发送的RRC连接建立消息，所述RRC连接建立消息包括所述接入网的中心单元为所述UE分配的信令无线承载的配置信息，所述配置信息用于指示所述UE配置所述信令无线承载。
可选的，处理模块903，用于在所述RRC连接建立消息中没有信令无线承载的底层协议栈的配置信息的情况下，使用默认的信令无线承载的底层协议栈的配置信息。
可选的，发送模块901，还用于向接入网的分布式单元发送连接建立请求消息；接收模块902，还用于接收分布式单元发送的RRC连接拒绝消息，RRC连接拒绝消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间。
发送模块901，还用于在第二定时器信息所指示的时间后，重新向分布式单元发送RRC连接建立请求。
需要说明的是，各个模块的实现还可以对应参照图4至图6所示的方法实施例的相应描述，执行上述实施例中用户单元所执行的方法和功能。
请继续参考图10，图10是本申请提出的另一种中心单元的结构示意图。如图所示，该中心单元可以包括：至少一个处理器1001，至少一个通信接口1002，至少一个存储器1003和至少一个通信总线1004。
其中，处理器1001可以是中央处理器单元，通用处理器，数字信号处理器，专用集成电路，现场可编程门阵列或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请公开内容所描述的各种示例性的逻辑方框，模块和电路。所述处理器也可以是实现计算功能的组合，例如包含一个或多个微处理器组合，数字信号处理器和微处理器的组合等等。通信总线1004可以是外设部件互连标准PCI总线或扩展工业标准结构EISA总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图10中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。通信总线1004用于实现这些组件之间的连接通信。其中，本申请实施例中设备的通信接口1002用于与其他节点设备进行信令或数据的通信。存储器1003可以包括易失性存储器，例如非挥发性动态随机存取内存(nonvolatile random access memory，NVRAM)、相变化随机存取内存(phase change RAM，PRAM)、磁阻式随机存取内存(magetoresistive RAM，MRAM)等，还可以包括非易失性存储器，例如至少一个磁盘存储器件、电子可擦除可编程只读存储器(electrically erasable programmable read-only memory，EEPROM)、闪存器件，例如反或闪存(NOR flash memory)或是反及闪存(NAND flash memory)、半导体器件，例如固态硬盘(solid state disk，SSD)等。存储器1003可选的还可以是至少一个位于远离前述处理器1001的存储装置。存储器1003中存储一组程序代码，且处理器1001执行存储器1003中上述中心单元所执行的程序。
通过通信接口1002接收所述接入网的分布式单元发送的第一消息，所述第一消息包括用户单元UE向所述分布式单元发送RRC连接建立请求的第一原因值信息；
通信接口1002向所述分布式单元发送第二消息，所述第二消息包括RRC连接建立消 息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
其中，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
其中，所述第一指示信息为第二原因值信息或指示值信息。
其中，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
可选的，处理器1001还用于执行如下操作：
根据所述第一原因值信息，确定允许所述UE建立RRC连接。
可选的，处理器1001还用于执行如下操作：
通信接口1002接收所述分布式单元发送的第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
其中，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
可选的，处理器1001还用于执行如下操作：
通过通信接口1002接收所述接入网的分布式单元发送的第一消息，所述第一消息包括第一定时器信息，所述第一定时器信息用于指示所述分布式单元生成用户单元UE重新发送RRC连接建立请求的时间；
通过通信接口1002向所述分布式单元发送第二消息，所述第二消息包括第二定时器信息，所述第二定时器信息用于指示所述UE重新发送所述RRC连接建立请求的时间；
其中，所述第二定时器信息与第一定时器信息相同，或所述第二定时器信息基于所述第一定时器信息生成。
进一步的，处理器还可以与存储器和通信接口相配合，执行上述申请实施例中上述中心单元的操作。
请继续参考图11，图11是本申请提出的另一种分布式单元的结构示意图。如图所示，该分布式单元可以包括：至少一个处理器1101，至少一个通信接口1102，至少一个存储器1103和至少一个通信总线1104。
其中，处理器1101可以是前文提及的各种类型的处理器。通信总线1104可以是外设部件互连标准PCI总线或扩展工业标准结构EISA总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图11中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。通信总线1104用于实现这些组件之间的连接通信。其中，本申请实施例中设备的通信接口1102用于与其他节点设备进行信令或数据的通信。存储器1103可以是前文提及的各种类型的存储器。存储器1103可选的还可以是至少一个位于远离前述处理器1101的存储装置。存储器1103中存储一组程序代码，且处理器1101执行存储器1103中上述分布式单元所执行的程序。
在接入网的分布式单元拒绝用户单元UE的RRC连接建立请求的情况下，通信接口1102向所述接入网的中心单元发送第一消息，所述第一消息包括所述RRC连接建立请求的第一原因值信息；
通过通信接口1102接收所述中心单元发送的所述第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE 建立RRC连接。
其中，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
其中，所述第一指示信息为第二原因值信息或指示值信息。
其中，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
可选的，处理器1101还用于执行如下操作：
通过通信接口1102向所述UE发送所述RRC连接建立消息，所述RRC连接建立消息包括所述中心单元为所述UE分配的信令无线承载的协议栈的配置信息。
可选的，处理器1101还用于执行如下操作：
通过通信接口1102向所述中心单元发送第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
其中，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
可选的，处理器1101还用于执行如下操作：
通过通信接口1102向所述接入网的中心单元发送第一消息，所述第一消息包括第一定时器信息，所述第一定时器信息用于指示所述分布式单元生成用户单元UE重新发送RRC连接建立请求的时间；
通过通信接口1102接收所述中心单元发送的所述第二消息，所述第二消息包括RRC连接拒绝消息和第二定时器信息；
其中，所述第二定时器信息与第一定时器信息相同，或所述第二定时器信息基于所述第一定时器信息生成。
可选的，处理器1101还用于执行如下操作：
通过通信接口1102向UE发送RRC连接拒绝消息，RRC连接拒绝消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间。
进一步的，处理器还可以与存储器和通信接口相配合，执行上述申请实施例中分布式单元的操作。
请继续参考图12，图12是本申请提出的另一种用户单元的结构示意图。如图所示，该用户单元可以包括：至少一个处理器1201，至少一个通信接口1202，至少一个存储器1203和至少一个通信总线1204。
其中，处理器1201可以是前文提及的各种类型的处理器。通信总线1204可以是外设部件互连标准PCI总线或扩展工业标准结构EISA总线等。所述总线可以分为地址总线、数据总线、控制总线等。为便于表示，图12中仅用一条粗线表示，但并不表示仅有一根总线或一种类型的总线。通信总线1204用于实现这些组件之间的连接通信。其中，本申请实施例中设备的通信接口1202用于与其他节点设备进行信令或数据的通信。存储器1203可以是前文提及的各种类型的存储器。存储器1203可选的还可以是至少一个位于远离前述处理器1201的存储装置。存储器1203中存储一组程序代码，且处理器1201执行存储器1203中上述用户单元所执行的程序。
通过通信接口1202向接入网的分布式单元发送RRC连接建立请求；
通过通信接口1202接收所述接入网的分布式单元发送的RRC连接建立消息，所述 RRC连接建立消息包括所述接入网的中心单元为所述UE分配的信令无线承载的配置信息，所述配置信息用于指示所述UE配置所述信令无线承载。
可选的，处理器1201还用于执行如下操作：
在所述RRC连接建立消息中没有信令无线承载的底层协议栈的配置信息的情况下，使用默认的信令无线承载的底层协议栈的配置信息。
可选的，处理器1201还用于执行如下操作：
通过通信接口1202向接入网的分布式单元发送连接建立请求消息；
通过通信接口1202接收分布式单元发送的RRC连接拒绝消息，RRC连接拒绝消息包括第二定时器信息，第二定时器信息用于指示UE重新发送RRC连接建立请求的时间。
可选的，处理器1201还用于执行如下操作：
通过通信接口1202在第二定时器信息所指示的时间后，重新向分布式单元发送RRC连接建立请求。
进一步的，处理器还可以与存储器和通信接口相配合，执行上述申请实施例中用户单元的操作。
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。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述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所述计算机程序指令时，全部或部分地产生按照本申请实施例所述的流程或功能。所述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。所述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，所述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。所述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含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。所述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。
以上所述的具体实施方式，对本申请的目的、技术方案和有益效果进行了进一步详细说明。凡在本申请的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (32)

  1. 一种无线资源控制RRC连接建立方法，其特征在于，包括：
    接入网的中心单元接收所述接入网的分布式单元发送的第一消息，所述第一消息包括用户单元UE向所述分布式单元发送RRC连接建立请求的第一原因值信息；
    所述中心单元向所述分布式单元发送第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
  2. 如权利要求1所述的方法，其特征在于，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
  3. 如权利要求1或2所述的方法，其特征在于，所述第一指示信息为第二原因值信息或指示值信息。
  4. 如权利要求3所述的方法，其特征在于，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
  5. 如权利要求1-4任一项所述的方法，其特征在于，所述中心单元向所述分布式单元发送第二消息，包括：
    在所述中心单元确定分布式单元拒绝所述UE接入的情况下，所述中心单元向所述分布式单元发送第二消息。
  6. 如权利要求1-5任一项所述的方法，其特征在于，所述中心单元向所述分布式单元发送第二消息之后，还包括：
    所述中心单元接收所述分布式单元发送的第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
  7. 如权利要求1-6任一项所述的方法，其特征在于，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
  8. 一种无线资源控制RRC连接建立方法，其特征在于，包括：
    在接入网的分布式单元拒绝用户单元UE的RRC连接建立请求的情况下，所述分布式单元向所述接入网的中心单元发送第一消息，所述第一消息包括所述RRC连接建立请求的第一原因值信息；
    所述分布式单元接收所述中心单元发送的所述第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
  9. 如权利要求8所述的方法，其特征在于，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
  10. 如权利要求8或9所述的方法，其特征在于，所述第一指示信息为第二原因值信息或指示值信息。
  11. 如权利要求10所述的方法，其特征在于，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
  12. 如权利要求8-11任一项所述的方法，其特征在于，所述分布式单元接收所述中心单元发送的所述第二消息之后，还包括：
    所述分布式单元向所述UE发送所述RRC连接建立消息，所述RRC连接建立消息包括所述中心单元为所述UE分配的信令无线承载的协议栈的配置信息。
  13. 如权利要求8-12任一项所述的方法，其特征在于，所述分布式单元接收所述中心单元发送的所述第二消息之后，还包括：
    所述分布式单元向所述中心单元发送第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
  14. 如权利要求8-13任一项所述的方法，其特征在于，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
  15. 一种无线资源控制RRC连接建立方法，其特征在于，包括：
    用户单元UE向接入网的分布式单元发送RRC连接建立请求；
    所述UE接收所述分布式单元发送的RRC连接建立消息，所述RRC连接建立消息包括所述接入网的中心单元为所述UE分配的信令无线承载的配置信息，所述配置信息用于指示所述UE配置所述信令无线承载。
  16. 如权利要求15所述的方法，其特征在于，所述UE接收所述分布式单元发送的RRC连接建立消息之后，还包括：
    在所述RRC连接建立消息中没有信令无线承载的底层协议栈的配置信息的情况下，所述UE使用默认的信令无线承载的底层协议栈的配置信息。
  17. 一种接入网的中心单元，其特征在于，包括：
    接收模块，用于接收所述接入网的分布式单元发送的第一消息，所述第一消息包括用户单元UE向所述分布式单元发送RRC连接建立请求的第一原因值信息；
    发送模块，用于向所述分布式单元发送第二消息，所述第二消息包括RRC连接建立 消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
  18. 如权利要求17所述的中心单元，其特征在于，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
  19. 如权利要求17或18所述的中心单元，其特征在于，所述第一指示信息为第二原因值信息或指示值信息。
  20. 如权利要求19所述的中心单元，其特征在于，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
  21. 如权利要求17-20任一项所述的中心单元，其特征在于，
    所述接收单元，还用于接收所述分布式单元发送的第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
  22. 如权利要求17-21任一项所述的中心单元，其特征在于，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
  23. 一种接入网的分布式单元，其特征在于，包括：
    发送模块，用于在接入网的分布式单元拒绝用户单元UE的RRC连接建立请求的情况下，向所述接入网的中心单元发送第一消息，所述第一消息包括所述RRC连接建立请求的第一原因值信息；
    接收模块，用于接收所述中心单元发送的所述第二消息，所述第二消息包括RRC连接建立消息和第一指示信息，所述第一指示信息用于指示所述分布式单元允许所述UE建立RRC连接。
  24. 如权利要求23所述的分布式单元，其特征在于，所述第二消息为下行RRC传送消息或UE上下文建立请求消息。
  25. 如权利要求23或24所述的分布式单元，其特征在于，所述第一指示信息为第二原因值信息或指示值信息。
  26. 如权利要求25所述的分布式单元，其特征在于，所述第二原因值信息与所述第一原因值信息相关、或所述第二原因值信息与所述第一原因值信息相同。
  27. 如权利要求23-26任一项所述的分布式单元，其特征在于，
    所述发送模块，还用于在所述中心单元确定分布式单元拒绝所述UE接入的情况下，向所述分布式单元发送第二消息。
  28. 如权利要求23-27任一项所述的分布式单元，其特征在于，
    所述发送模块，还用于向所述UE发送所述RRC连接建立消息，所述RRC连接建立消息包括所述中心单元为所述UE分配的信令无线承载的协议栈的配置信息。
  29. 如权利要求23-28任一项所述的分布式单元，其特征在于，
    所述发送模块，还用于向所述中心单元发送第三消息，所述第三消息包括第二指示信息，所述第二指示信息用于指示所述分布式单元拒绝所述UE建立RRC连接的原因。
  30. 如权利要求23-29任一项所述的分布式单元，其特征在于，所述第一原因值信息为紧急呼叫、高优先级接入或接入网通知区更新。
  31. 一种用户单元UE，其特征在于，包括：
    发送模块，用于向接入网的分布式单元发送RRC连接建立请求；
    接收模块，用于接收所述分布式单元发送的RRC连接建立消息，所述RRC连接建立消息包括所述接入网的中心单元为所述UE分配的信令无线承载的配置信息，所述配置信息用于指示所述UE配置所述信令无线承载。
  32. 如权利要求31所述的UE，其特征在于，所述UE还包括：
    处理模块，用于在所述RRC连接建立消息中没有信令无线承载的底层协议栈的配置信息的情况下，使用默认的信令无线承载的底层协议栈的配置信息。
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