WO2021134699A1 - 一种系统信息的传递方法和装置 - Google Patents

一种系统信息的传递方法和装置 Download PDF

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Publication number
WO2021134699A1
WO2021134699A1 PCT/CN2019/130940 CN2019130940W WO2021134699A1 WO 2021134699 A1 WO2021134699 A1 WO 2021134699A1 CN 2019130940 W CN2019130940 W CN 2019130940W WO 2021134699 A1 WO2021134699 A1 WO 2021134699A1
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WIPO (PCT)
Prior art keywords
cell
terminal device
ran
request
information
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PCT/CN2019/130940
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English (en)
French (fr)
Inventor
郝金平
晋英豪
张洁涛
Original Assignee
华为技术有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2019/130940 priority Critical patent/WO2021134699A1/zh
Priority to CN201980103221.2A priority patent/CN114902741A/zh
Priority to EP19958107.5A priority patent/EP4068861A4/en
Publication of WO2021134699A1 publication Critical patent/WO2021134699A1/zh
Priority to US17/842,345 priority patent/US20220312534A1/en

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    • 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
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/14—Access restriction or access information delivery, e.g. discovery data delivery using user query or user detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H04W48/12—Access restriction or access information delivery, e.g. discovery data delivery using downlink control channel
    • 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
    • H04W76/20—Manipulation of established connections
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access, e.g. scheduled or random access
    • H04W74/08—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access]
    • H04W74/0833—Non-scheduled or contention based access, e.g. random access, ALOHA, CSMA [Carrier Sense Multiple Access] using a random access procedure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of wireless communication, and in particular to a method and device for transmitting system information.
  • 5G fifth generation
  • 5G will support diversified application requirements, including support for higher-rate experience and greater bandwidth access capabilities, lower latency and high-reliability information interaction, and the connection of larger-scale and low-cost machine-type communication devices. Entry and management, etc. Supporting the ubiquitous needs of various vertical industries and ensuring energy conservation are key factors for the application of 5G.
  • a terminal device When a terminal device accesses a mobile network, it will search for and access a cell on a carrier frequency within a certain frequency range, and this carrier frequency may also be called a carrier.
  • the terminal device uses resources within a certain bandwidth range corresponding to the carrier to perform data communication with the mobile network, and the bandwidth range may include multiple subcarriers.
  • a cell sends public broadcast signaling, such as synchronization signals and system information, on some subcarriers corresponding to its carrier, so that terminal equipment can access the cell.
  • the terminal device realizes synchronization with the cell through the synchronization signal, and obtains the necessary information for accessing the cell by reading the system information, thereby accessing the cell.
  • some public broadcast signaling or even public broadcast signaling may not be sent.
  • some system information may be sent, or system information may not be sent at all, or synchronization signals may be further not sent to reduce transmission.
  • the power consumption and launch time of the machine For these cells, how to enable terminal equipment to access, there is currently no appropriate solution.
  • the embodiment of the present application provides a method for transmitting system information, which effectively enables terminal equipment to access an energy-saving cell.
  • the present application provides a method for transferring system information, including: a terminal device sends a first request to a radio access network RAN device, the first request includes first information, and the first information is used to indicate the following At least one item: the terminal device expects to access the second cell, the second cell that the terminal device expects to access, at least part of the identification of the terminal device, and the first request is for the terminal device and the first controlled by the RAN device
  • the cell establishes a radio resource control RRC connection; the terminal device receives a first response to the first request from the RAN device, and the first response includes the cell identity and partial system information SI of each of the one or more second cells .
  • the method provided in the embodiment of the present application realizes that the terminal device obtains the partial SI of the second cell when accessing the RAN, thereby enabling the terminal device to access the second cell.
  • the method before the terminal device sends the first request to the radio access network RAN device, the method further includes: the terminal device sends a random access preamble to the RAN device; and the terminal device receives from the RAN device. Random access response from RAN equipment.
  • the terminal device obtains the partial SI of the second cell when randomly accessing the first cell.
  • the first information in a case where the first information is used to indicate the second cell that the terminal device expects to access, the first information includes one or more identities of the second cells.
  • the terminal device informs the second cell that it expects to access when accessing the first cell, so that the first cell can send the partial SI of the specific second cell expected by the terminal device to the terminal device, improving the information transmission effectiveness.
  • the first information in the case that the first information is used to indicate at least part of the identification of the terminal device, the first information includes at least part of the temporary terminal device identification provided by the 5G core network for the terminal device. logo.
  • the terminal device only needs to carry at least part of the identification of the terminal device in the RRC request, thereby saving air interface signaling overhead.
  • the first cell sends system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal device initially accesses the second cell. Required system information.
  • the first information is used to at least partially identify the terminal device, including: the first information includes at least part of the identification of the temporary terminal device identification provided by the fifth-generation 5G core network for the terminal device .
  • part of the system information of the second cell includes the remaining minimum system information RMSI of the second cell.
  • part of the system information of the second cell includes the RMSI of the second cell and other system information OSI.
  • the first request is an RRC connection request message or an RRC establishment request message.
  • the first response is an RRC rejection message or an RRC connection rejection message.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the terminal device sends the first request to the radio access network RAN device, including the terminal device sending the first request to the centralized unit CU of the RAN device through the distributed unit DU of the RAN device
  • the terminal device receives the first response to the first request from the RAN device, including the terminal device receiving the first response from the CU through the DU; the DU is connected to the CU.
  • the present application provides a method for transferring system information, including: a radio access network RAN device receives a first request from a terminal device, the first request includes first information, and the first information is used to indicate At least one of the following: the terminal device expects to access the second cell, the second cell that the terminal device expects to access, at least part of the identification of the terminal device, and the first request is for the terminal device and the first cell controlled by the RAN device A cell establishes a radio resource control RRC connection; the RAN device sends a first response to the first request to the terminal device, and the first response includes the cell identity and part of the system information of each of the one or more second cells .
  • the method provided in the embodiment of the present application realizes that the terminal device obtains the partial SI of the second cell when accessing the RAN, thereby enabling the terminal device to access the second cell.
  • the method before the RAN device receives the first request from the terminal device, the method further includes: the RAN device receives a random access preamble from the terminal device; and the RAN device sends to the terminal device Random access response.
  • the terminal device obtains the partial SI of the second cell when initially accessing the first cell.
  • the first information in a case where the first information is used to indicate the second cell that the terminal device expects to access, the first information includes one or more identities of the second cells.
  • the terminal device informs the second cell that it expects to access when accessing the first cell, so that the first cell can send the partial SI of the specific second cell expected by the terminal device to the terminal device, which improves the information transmission. effectiveness.
  • the first information in the case that the first information is used to indicate at least part of the identification of the terminal device, the first information includes at least part of the temporary terminal device identification provided by the 5G core network for the terminal device. logo.
  • the terminal device only needs to carry at least part of the identification of the terminal device in the RRC request, thereby saving air interface signaling overhead.
  • the method before the radio access network RAN device receives the first request from the terminal device, the method further includes: the RAN device obtains the information of each second cell of the one or more second cells Cell ID and some system information.
  • the first cell sends system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal device initially accesses the second cell. Required system information.
  • the first information is used to at least partially identify the terminal device, including: the first information includes at least part of the identification of the temporary terminal device identification provided by the fifth-generation 5G core network for the terminal device .
  • part of the system information of the second cell includes the remaining minimum system information RMSI of the second cell.
  • part of the system information of the second cell includes the RMSI of the second cell and other system information OSI.
  • the first request is an RRC connection request message or an RRC establishment request message.
  • the first response is an RRC rejection message or an RRC connection rejection message.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the radio access network RAN device receives the first request from the terminal device, and the centralized unit CU including the RAN device receives the first request from the terminal device through the distributed unit DU;
  • the RAN device sends the first response of the first request to the terminal device, including that the CU sends the first response to the terminal device through the DU;
  • the DU is connected to the CU.
  • this application provides a method for transferring system information, including: a terminal device sends a radio resource control RRC re-establishment request to a radio access network RAN device, the RRC re-establishment request includes first information, and the first The information is used to indicate at least one of the following: the terminal device expects to access the second cell, the second cell that the terminal device expects to access, and the first request is used for the terminal device to perform RRC with the first cell controlled by the RAN device Re-establishment; the terminal device receives an RRC re-establishment response message from the RAN device, the RRC re-establishment response message includes the cell identity of each second cell in one or more second cells and part of the system information SI.
  • the method provided in the embodiments of the present application realizes that the terminal device in the RRC connected state actively requests to obtain part of the SI of the DCC cell, thereby enabling the terminal device to access the DCC cell.
  • the first information in a case where the first information is used to indicate the second cell that the terminal device expects to access, the first information includes one or more identities of the second cells.
  • the terminal device informs the second cell that it expects to access during RRC re-establishment, so that the first cell can send the partial SI of the specific second cell expected by the terminal device to the terminal device, improving the efficiency of information transmission.
  • the first cell sends system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal device initially accesses the second cell. Required system information.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the terminal device sends an RRC re-establishment request to the radio access network RAN device, including that the terminal device sends the RRC re-establishment request to the centralized unit CU of the RAN device through the distributed unit DU of the RAN device.
  • Establishment request; the terminal device receiving the RRC re-establishment response message from the RAN device includes the terminal device receiving the RRC re-establishment response message sent from the CU through the DU; the DU is connected to the CU.
  • the present application provides a method for transferring system information, including: a radio access network RAN device receives a radio resource control RRC re-establishment request from a terminal device, the RRC re-establishment request includes first information, and the first information A piece of information is used to indicate at least one of the following: the terminal device expects to access the second cell, the second cell that the terminal device expects to access, and the first request is used for the terminal device to communicate with the first cell controlled by the RAN device RRC re-establishment; the RAN device sends an RRC re-establishment response message to the terminal device.
  • the RRC re-establishment response message includes the cell identity of each of the one or more second cells and part of the system information SI.
  • the method provided in the embodiments of the present application realizes that the terminal device in the RRC connected state actively requests to obtain part of the SI of the DCC cell, thereby enabling the terminal device to access the DCC cell.
  • the first information in a case where the first information is used to indicate the second cell that the terminal device expects to access, the first information includes one or more identities of the second cells.
  • the terminal device informs the second cell that it expects to access during RRC re-establishment, so that the first cell can send the partial SI of the specific second cell expected by the terminal device to the terminal device, improving the efficiency of information transmission.
  • the first cell sends system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal device initially accesses the second cell. Required system information.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the radio access network RAN device receives the RRC re-establishment request from the terminal device, and the centralized unit CU including the RAN device receives the RRC re-establishment request from the terminal device through the distributed unit DU
  • the RAN device sends an RRC re-establishment response message to the terminal device, including the CU sending the RRC re-establishment response message to the terminal device through the DU; the DU is connected to the CU.
  • the present application provides a method for transferring system information, including: a terminal device receives a radio resource control RRC reconfiguration message sent by a radio access network RAN device, the RRC reconfiguration message includes second information, The second information includes the cell identity and partial system information SI of each second cell in one or more second cells.
  • the terminal device has established an RRC connection with the first cell controlled by the RAN device; the terminal device sends an RRC to the RAN device Reconfiguration response message.
  • the first cell actively sends the SI of the second cell to the terminal device in the RRC connected state, thereby enabling the terminal device to access the second cell.
  • the first cell sends system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal device initially accesses the second cell. Required system information.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the terminal device receives the RRC reconfiguration message from the RAN device, including the terminal device receiving the RRC reconfiguration message sent by the centralized unit CU of the RAN device to the terminal device through the distributed unit DU.
  • the RRC reconfiguration response message of the terminal device to the RAN device includes the terminal device sending the RRC reconfiguration response message to the CU through the DU; the DU is connected to the CU.
  • the present application provides a method for transferring system information, including: a radio access network RAN device sends a radio resource control RRC reconfiguration message to a terminal device, the RRC reconfiguration message includes second information, and the second The information includes the cell identity of each second cell in one or more second cells and part of the system information SI.
  • the terminal device has established an RRC connection with the first cell controlled by the RAN device; the RAN device receives the RRC from the terminal device Reconfiguration response message.
  • the first cell actively sends the SI of the second cell to the terminal device in the RRC connected state, thereby enabling the terminal device to access the second cell.
  • the first cell sends system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal device initially accesses the second cell. Required system information.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the RAN device sends an RRC reconfiguration message to the terminal device, including the RRC reconfiguration message sent by the centralized unit CU of the RAN device to the terminal device through the distributed unit DU; the RAN device receives The RRC reconfiguration response message from the terminal device includes the CU receiving the RRC reconfiguration response message from the terminal device through the DU; the DU is connected to the CU.
  • the present application provides a method for transferring system information, including: a first radio access network RAN device sends second information to a second RAN device, and the second information is used to indicate the location of the first RAN device.
  • the first cell can learn the partial SI of the second cell, and enable the first cell to send the partial SI of the second cell to the terminal device.
  • the first RAN device sends third information to the second RAN device, where the third information is used to indicate that one or more cells controlled by the first RAN device are the second cells.
  • the first RAN device receives a response of the third information from the second RAN device.
  • the first cell can learn which second cells are around it, and provide auxiliary information for the first cell to send part of the SI of the second cell to the terminal device.
  • the third information includes information used to indicate what type of second cell the second cell is.
  • the first cell can learn what type of second cell the second cell is, and further provide auxiliary information for the first cell to send part of the SI of the second cell to the terminal device.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the central unit CU of the first RAN device sends the second information to the second RAN device; the CU of the first RAN device receives the second information from the second RAN device response.
  • the present application provides a method for transferring system information, including: a second radio access network RAN device receives second information from a first RAN device, and the second information is used to indicate the first RAN device The cell identity and partial system information SI of each second cell in the controlled one or more second cells; the second RAN device sends a response to the second information to the first RAN device; the second RAN device controls one Or multiple first cells; the first cell sends the system information required for the terminal device to initially access the first cell, and the second cell partially sends or does not send the terminal equipment needed for the initial access to the second cell system message.
  • the first cell can learn the partial SI of the second cell, and enable the first cell to send the partial SI of the second cell to the terminal device.
  • the second RAN device receives third information from the first RAN device, and the third information is used to indicate that one or more cells controlled by the first RAN device are second cells .
  • the second RAN device sends a response of the third information to the first RAN device.
  • the first cell can learn which second cells are around it, and provide auxiliary information for the first cell to send part of the SI of the second cell to the terminal device.
  • the third information includes information used to indicate what type of second cell the second cell is.
  • the first cell can learn what type of second cell the second cell is, and further provide auxiliary information for the first cell to send part of the SI of the second cell to the terminal device.
  • the first cell and/or the second cell are new radio NR cells (or cells controlled by gNB).
  • the first cell and/or the second cell are LTE cells (or cells controlled by gNB).
  • the first cell and/or the second cell are eLTE cells (or cells controlled by ng-eNB).
  • the centralized unit DU of the second RAN device receives the second information from the second RAN device through the centralized unit CU to which the DU is connected; the DU of the second RAN device passes through the The CU sends a response to the second information to the second RAN device.
  • a terminal device which is used to execute the method in the first aspect or any one of the possible implementation manners of the first aspect, or the third aspect or any one of the possible implementation manners of the third aspect, Or the method in the fifth aspect or any one of the possible implementations of the fifth aspect, specifically, the terminal device may include any one of the possible implementations for executing the first aspect or the first aspect, or the third Aspect or any one of the possible implementation manners of the third aspect, or a unit of the method in the fifth aspect or any one of the possible implementation manners of the fifth aspect.
  • a radio access network RAN device which is used to implement the second aspect or any possible implementation manner of the second aspect, or any possible implementation manner of the fourth aspect or the fourth aspect , Or any possible implementation of the sixth aspect or the sixth aspect, or any possible implementation of the seventh or seventh aspect, or any possible implementation of the eighth aspect or the eighth aspect
  • the method in the manner, specifically, the RAN device may include any possible implementation manner for executing the second aspect or the second aspect, or any possible implementation manner of the fourth aspect or the fourth aspect, or In any possible implementation manner of the sixth aspect or the sixth aspect, or any possible implementation manner of the seventh aspect or the seventh aspect, or any possible implementation manner of the eighth aspect or the eighth aspect Unit of the method.
  • a computer program product includes: computer program code, when the computer program code is used by a communication unit, a processing unit, or a transceiver of a communication device (for example, an access network device or a terminal device)
  • a communication device for example, an access network device or a terminal device
  • the communication device is caused to execute the method in any one of the first to eighth aspects or any one of the first to eighth aspects.
  • a computer-readable storage medium stores a program that enables a computer to execute any possible implementation of the first to eighth aspects or the first to eighth aspects The method in the way.
  • an embodiment of the present application provides a chip, which is coupled with a memory, and executes any possible design of the first aspect or the first aspect, and any of the second aspect or the second aspect of the embodiments of the present application.
  • FIG. 1 is a schematic diagram of a wireless communication system provided by an embodiment of the present application.
  • FIG. 2 is a schematic diagram of the architecture of a gNB divided into CU and DU according to an embodiment of the present application;
  • FIG. 3 is a schematic diagram of the difference between the transmission of physical frame information of a BCC cell and a DCC cell in NR according to an embodiment of the present application;
  • FIG. 4 is a schematic flowchart of a method for a terminal device to randomly access a RAN device and establish an RRC connection according to an embodiment of the present application;
  • FIG. 5 is a schematic flowchart of another method for a terminal device to randomly access a RAN device and establish an RRC connection according to an embodiment of the present application
  • FIG. 6 is a schematic flowchart of a method for a terminal device to request a RAN device to send a partial SI of a DCC cell according to an embodiment of the present application;
  • FIG. 7 is a schematic flowchart of a method for a RAN device to actively send a partial SI of a DCC cell to a terminal device according to an embodiment of the present application;
  • FIG. 8 is a schematic flowchart of a method for a terminal device to request an SI of a DCC cell from a RAN device according to an embodiment of the present application
  • FIG. 9 is a schematic flowchart of a method for information exchange between a first RAN device that controls a DCC cell and a second RAN device that controls a BCC cell according to an embodiment of the present application;
  • FIG. 10 is a schematic block diagram of a terminal device provided by an embodiment of the present application.
  • FIG. 11 is another schematic block diagram of a terminal device according to an embodiment of the present application.
  • FIG. 12 is a schematic block diagram of a first network device according to an embodiment of the present application.
  • FIG. 13 is another schematic block diagram of the first network device according to an embodiment of the present application.
  • FIG. 14 is a schematic block diagram of a second network device according to an embodiment of the present application.
  • FIG. 15 is another schematic block diagram of a second network device according to an embodiment of the present application.
  • system and "network” in this article are often used interchangeably in this article.
  • LTE Long Term Evolution
  • 5G 5th generation
  • NR new radio
  • NG next generation
  • future mobile communication systems etc.
  • a terminal device is connected to a radio access network (RAN) device through a wireless link, and communicates with other terminal devices via the core network (CN) device connected to the RAN device. Communication or access to wireless Internet, etc.
  • RAN radio access network
  • CN core network
  • a terminal device is wirelessly connected to a RAN device to achieve communication.
  • one terminal device can also be wirelessly connected with two or more RAN devices to achieve communication.
  • Fig. 1 shows a schematic diagram of a wireless communication system 100 provided by an embodiment of the present application.
  • the terminal device 120 is wirelessly connected to the RAN device 140 through the air interface 160.
  • the wireless communication system further includes the terminal device 120 wirelessly connecting with the RAN device 142 through the air interface 162.
  • the data transmission between the terminal device 120 and the core network 180 may be transmitted through the interface between the RAN device 140 and the core network 180, and the data between the terminal device 120 and the RAN device 142 may be transmitted through the RAN device.
  • the interface between the device 140 and the RAN device 142 realizes the transmission with the core network 180 via the RAN device 140; in another possible implementation manner, the data transmission between the terminal device 120 and the core network 180 can pass through the RAN device 140 respectively.
  • the interface with the core network 180 and the interface between the RAN device 142 and the core network 180 perform transmission.
  • the RAN device 140 and the RAN device 142 in FIG. 1 may be deployed in different geographic locations, respectively; they may also be deployed in the same geographic location, that is, the RAN device 140 and the RAN device 142 are deployed in a co-site.
  • the RAN device shown in Figure 1 can be a next-generation base station, such as next-generation Node B (gNB) or next-generation evolved Node B (ng-eNB) ), etc., it can also be an access point (AP) in a wireless local area network (Wireless Local Area Networks, WLAN), or an evolved base station (evolved Node B, eNB or eNodeB) in LTE, or a relay station or access point Point, or vehicle-mounted device, wearable device, transmission and reception point (TRP), etc.
  • next-generation base station such as next-generation Node B (gNB) or next-generation evolved Node B (ng-eNB)
  • AP access point
  • WLAN wireless Local Area Networks
  • evolved Node B, eNB or eNodeB evolved base station
  • eNodeB evolved Node B
  • TRP transmission and reception point
  • the terminal device communicates with the RAN device through the transmission resources (for example, frequency domain resources, time domain resources, code domain resources, etc.) used by one or more cells managed by the RAN device, and the cell may belong to a macro cell (macro cell).
  • cell, hypercell, or small cell where the small cell may include: metro cell, micro cell, pico cell, femto cell Femto cells, etc.
  • These small cells have the characteristics of small coverage and low transmit power, and are suitable for providing high-rate data transmission services.
  • the terminal equipment in Figure 1 can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile equipment, user terminal, terminal, wireless Communication equipment, user agent or user device.
  • UE user equipment
  • the terminal device can be a station (ST) in a WLAN, a cellular phone, a cordless phone, a SIP phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, Handheld devices with wireless communication functions, relay devices, computing devices or other processing devices coupled to wireless modems, in-vehicle devices, wearable devices, and next-generation communication systems, such as terminal devices in 5G networks or future evolution of public land Terminal equipment in the mobile network (public land mobile network, PLMN) network, etc.
  • the terminal device may also be a wearable device. Wearable devices can also be called wearable smart devices.
  • wearable technology it is a general term for the application of wearable technology to intelligently design daily wear and develop wearable devices, such as glasses, gloves, watches, clothing and shoes.
  • a wearable device is a portable device that is directly worn on the body or integrated into the user's clothes or accessories.
  • Wearable devices are not only a kind of hardware device, but also realize powerful functions through software support, data interaction, and cloud interaction.
  • wearable smart devices include full-featured, large-sized, complete or partial functions that can be achieved without relying on smart phones, such as smart watches or smart glasses, and only focus on a certain type of application function, and need to cooperate with other devices such as smart phones.
  • a RAN device such as gNB
  • a RAN device can be further divided into a centralized unit (CU) and a distributed unit (DU) according to the protocol stack, where CU and DU can be separately Deploy on different physical devices.
  • the CU is responsible for the operations of the RRC layer, the SDAP layer, and the PDCP layer
  • the DU is responsible for the operations of the RLC layer, the MAC layer, and the PHY layer.
  • Figure 2(a) shows an architecture of gNB divided into CU and DU.
  • one gNB may include one CU and one or more DUs, and the one or more DUs are controlled by the one CU.
  • a DU and CU are connected through a control plane interface (such as F1-C) for transmitting control plane data; a DU and CU are connected through a user plane interface (such as F1-U) for transmitting user plane data.
  • the CU can also be divided into a centralized unit of the control plane (that is, a centralized unit control plane CU-CP network element) and a centralized unit of the user plane (that is, a centralized unit user plane CU-UP network element), where CU-CP and CU -UP can also be separately deployed on different physical devices.
  • CU-CP is responsible for the processing of the RRC layer and the control plane of the PDCP layer
  • CU-UP is responsible for the processing of the user plane of the SDAP layer and the PDCP layer.
  • Figure 2(b) shows an architecture of gNB divided into CU-CP, CU-UP and DU.
  • one gNB may include one CU-CP, one or more CU-UPs, and one or more DUs.
  • a CP-UP is only connected to one CU-CP through a control plane interface (such as E1) for transmission of control plane data; a DU is only connected to one CU-CP through a control plane interface (such as F1-C) for transmission Control plane data; under the control of CU-CP, a DU can be connected to one or more CU-UPs, and a CU-UP can also be connected to one or more DUs.
  • CU-UP and DU are connected through a user plane interface (Such as F1-U) connection, used to transmit user plane data. It is worth noting that, in order to maintain the flexibility of the network, one DU or one CU-UP can also be connected to multiple CU-CPs.
  • the protocol stack division method by which the above-mentioned RAN device is divided into CU and DU is only exemplary, and the RAN device may also divide CU and DU according to other division methods.
  • the CU may be responsible for the operations of the RRC layer, SDAP layer, PDCP layer, and RLC layer, and the DU may be responsible for the MAC layer and PHY layer operations; or the CU may be responsible for the RRC layer and SDAP layer operations, and the DU may be responsible for the PDCP layer and RLC layer.
  • the operation of the MAC layer and the PHY layer, etc.; similarly, the protocol stack division method between the CU-CP and CU-UP in the CU is also variable; the application does not specifically limit this.
  • SI System information
  • SI generally includes a master information block (MIB) and multiple system information blocks (SIB).
  • MIB master information block
  • SIB system information blocks
  • the MIB and each SIB can use the same or different periods for broadcasting.
  • the MIB is sent on the physical broadcast channel (PBCH), and each SIB can be sent on the downlink shared channel.
  • Multiple SIBs are divided into SIB1 and other SIBs, and other SIBs include SIB2, SIB3, SIB4, and so on.
  • SIBs contain different contents and have different functions.
  • SIB1 contains information required for initial access to the system
  • SIB2 contains cell reselection information
  • SIB3 contains service frequency information and neighbor cell information related to same-frequency cell reselection.
  • SIB4 contains other frequency information and neighbor cell information related to inter-frequency cell reselection.
  • a BCC cell refers to a cell that periodically sends public broadcast signaling.
  • the public broadcast signaling includes synchronization signals and SI, and the public broadcast signaling may also include paging signaling.
  • the RAN device controlling the BCC cell periodically sends public broadcast signaling on the resource corresponding to the carrier of the BCC cell.
  • the RAN device broadcast signal/message that controls a cell is also referred to as the cell broadcast signal/message. Since the BCC cell broadcasts the SI, the BCC cell allows the terminal equipment to access. The terminal device obtains the necessary information for accessing the BCC cell by reading the SI, so that it can access the BCC cell.
  • a DCC cell refers to a cell that does not send at least part of public broadcast signaling on the resource corresponding to its carrier, for example, does not send SI or sends part of SI.
  • the DCC cell may not send paging signaling and so on. Since the transmission of public broadcast signaling is reduced, the transmission time and/or transmission power of the DCC cell can be reduced, thereby achieving the purpose of energy saving. Since the DCC cell does not send the necessary SI to obtain the access to the DCC cell, the DCC cell does not allow the access of new terminal equipment, but can provide data transmission for the terminal equipment that has already been accessed.
  • the connected terminal device may obtain the necessary SI for accessing the DCC cell through other means, or access the cell before the DCC cell is converted from the BCC cell to the DCC cell.
  • the DCC cell may not send all the public broadcast signaling, that is, not send the synchronization signal and SI, so as to further save energy.
  • Synchronization signal block (synchronization signal block, SSB): SSB includes primary synchronization signal (primary synchronization signal, PSS), secondary synchronization signal (secondary synchronization signal, SSS), and physical broadcast channel (physical broadcast channel, PBCH). Among them, the SSB occupies 4 symbols in the time domain and 240 sub-carriers in the frequency domain, and can use a period of 5ms to 160ms for broadcasting. PSS is transmitted in the first OFDM symbol of SSB and occupies 127 subcarriers; SSS is transmitted in the third OFDM symbol of SSB and also occupies 127 subcarriers; PBCH is transmitted in the second OFDM and fourth OFDM symbols of SSB and occupies 127 subcarriers.
  • PSS primary synchronization signal
  • SSS secondary synchronization signal
  • PBCH physical broadcast channel
  • each beam can correspond to one SSB, and SSBs of different beams can use beam scanning to send SSBs in a time division multiplexing manner.
  • the collection of SSBs of multiple beams is called an SS burst set (SS burst set).
  • the above-mentioned broadcast period of the SSB refers to the broadcast period of the SSB of one beam, and one SS burst set is always sent within a range of 5 ms.
  • the UE For the initial access of NR, when the UE enters the coverage area of the mobile network, it will first perform a cell search based on SSB, and obtain physical layer cell identification (PCI), frequency synchronization, and downlink time synchronization through PSS and SSS detection;
  • PCI physical layer cell identification
  • the MIB can be obtained by decoding the PBCH, which contains a small amount of information required by the terminal to obtain the remaining system information of the network broadcast, such as the system frame number, SSB time index, DMRS location, and SIB1 configuration.
  • the MIB configuration provides the search space required by the UE to detect SIB1, control resource sets (CORESET), and other physical downlink control channel (PDCCH) related parameters.
  • SIB1 is also called remaining minimum system information (RMSI).
  • the RMSI includes system information that the UE needs to know to access the network, such as the information that the UE must know for random access, that is, the necessary SI for accessing the cell.
  • SIB1 is equivalent to RMSI in the following, and the two can be used interchangeably.
  • the NR cell usually broadcasts the RMSI periodically so that the UE can access the network.
  • Other system information (OSI) other than SIB1 in the SIB includes system information that the UE does not need to know before accessing the system. These OSIs can be broadcast periodically, or they can be transmitted on demand, that is, they are sent only when the UE requests it. It should be noted that, for a DCC cell that does not send RMSI, its MIB may not include the SIB1 configuration.
  • Fig. 3 shows a schematic diagram of the difference between the physical frame information transmission of the BCC cell and the DCC cell in NR.
  • Fig. 3(a) shows the information sent by the physical frame of the BCC cell.
  • the physical frame may correspond to a subframe or a time slot, and may be sent periodically.
  • the BCC cell broadcasts public broadcast signaling SSB, RMSI, and OSI, which can provide access to terminal devices.
  • Figure 3(b) to Figure 3(d) show three types of DCC cells.
  • the DCC1 cell corresponding to Figure 3(b) broadcasts some public broadcast signaling such as SSB, but does not broadcast RMSI and OSI;
  • Figure 3(c) The corresponding DCC2 cell broadcasts SSB and OSI, but does not broadcast RMSI; the corresponding DCC3 cell in Figure 3(d) does not broadcast public broadcast signaling.
  • the sending of various public broadcast signaling in Figure 3 (a) to Figure 3 (d) is illustrative, and the specific physical resources used by each cell to send these public broadcast signaling are not described in detail; In addition to the resources occupied by public broadcast signaling in the physical frames in Figures 3(a) to 3(c), other unmarked physical frame resources can be used for data transmission and other control signaling transmission.
  • a possible scenario is that BCC cells serve as the coverage layer of heterogeneous networks, mainly providing control plane data transmission and small-capacity user plane data transmission; DCC cells serve as the capacity layer of heterogeneous networks, and their coverage Smaller than the BCC cell, the capacity layer is superimposed on the overlay layer, which mainly provides large-capacity user plane data transmission.
  • the DCC cell can provide data plane transmission. Since RMSI is not broadcast, periodic public broadcast signaling is reduced to achieve energy saving.
  • the BCC cell and the DCC cell jointly provide data transmission for the terminal device to realize dual connections between the terminal device and the network. As shown in FIG.
  • the terminal device 120 is connected to the RAN device 140 and the RAN device 142 at the same time.
  • the DCC cell can be used as a secondary cell (group) of the BCC cell to provide data transmission for the terminal equipment.
  • the DCC cell itself does not accept the access of the terminal equipment, reducing control plane signaling to achieve energy saving.
  • the embodiments of the present application provide a technical solution for transmitting system information. Further, the technical solution of the embodiment of the present application is also applied to a RAN device architecture with CU and DU, where the CU may also include the case where the CU-CP and the CU-UP are separated.
  • FIGS. 4 to 9 are schematic flowcharts of method embodiments of the present application, showing detailed communication steps or operations of the method, but these steps or operations are only examples, and the embodiments of the present application are also Other operations or variations of the various operations in FIGS. 4 to 9 can be performed.
  • the steps in FIGS. 4 to 9 may be executed in a different order from that shown in FIGS. 4 to 9, and it is possible that not all the operations in FIGS. 4 to 9 are to be performed.
  • the BCC cell when a terminal device in the RRC idle state attempts to access a BCC cell, the BCC cell sends the SI of the DCC cell to the terminal device.
  • This implementation may be applied to the terminal device expecting to access the DCC cell, but since the DCC cell does not send the system information required for initial access to the DCC cell, the terminal device can only try to access the BCC cell, and when accessing the BCC cell Inform the network that it expects to access the DCC cell.
  • FIG. 4 is a schematic flowchart of a method for a terminal device to randomly access a RAN device and establish a radio resource control (Radio Resource Control, RRC) connection provided by an embodiment of the application.
  • the method 400 can be applied to eNBs where terminal equipment randomly accesses LTE, and can also be applied to ng-eNBs where terminal equipment randomly accesses eLTE or gNB of NR.
  • the process described in Figure 4 includes the following steps:
  • the terminal device sends a random access preamble to the RAN device.
  • the RAN device receives the random access preamble from the terminal device.
  • the terminal device sends a random access preamble to the RAN device to try to access a cell controlled by the RAN device.
  • the RAN device controls one or more BCC cells, and the cell that the terminal device tries to access is the BCC cell.
  • the terminal device randomly selects a random access preamble from the random access preamble set, and selects the appropriate PRACH resource from the pre-configured physical random access channel (PRACH) resource pool to send to the RAN device
  • the random access preamble For the convenience of description, in the following, the terminal device sends a signal or information to the RAN device that controls the BCC cell, which may also be referred to as the terminal device sending a signal or information to the BCC cell.
  • the terminal device is in the RRC idle state before performing step S401.
  • the terminal device receives a network-side paging or has its own service initiation, it performs step S401 to access the cell and establish an RRC connection.
  • the RAN device sends a random access response to the terminal device.
  • the terminal device receives the random access response from the RAN device.
  • the RAN device After the RAN device receives the random access preamble sent by the terminal device, it calculates the timing advance (TA) sent by the terminal device according to the time when the random access preamble is received, and allocates the TA and the terminal device to send RRC
  • the requested uplink resource grant is sent to the UE through a random access response.
  • the RAN device controlling the BCC cell sends a signal or information to the terminal device, which may also be referred to as the BCC cell sending a signal or information to the terminal device.
  • the terminal device sends an RRC request message to the RAN device.
  • the RAN device receives the RRC request message from the terminal device.
  • the RRC request message is used by the terminal device to request to establish an RRC connection with the RAN device.
  • the RRC request message includes first information, and the first information is used to indicate that the terminal device expects to access the DCC cell.
  • the first information may use a one-bit information element to indicate whether the terminal device expects to access the DCC cell, for example, when the bit value is 1, it indicates that the terminal device expects to access the DCC cell, or when the bit value is 0, it indicates The terminal equipment expects to access the DCC cell.
  • the terminal device randomly selects a number within a preset number range as its own identity (such as ue-Identity), and sends an RRC request message to the RAN device according to the TA sent by the RAN device.
  • the RRC request message is an RRC connection request (RRCConnectionRequest) message or an RRC setup request (RRCSetupRequest) message.
  • RRCConnectionRequest RRC connection request
  • RRCSetupRequest RRC setup request
  • the RAN device sends an RRC rejection message to the terminal device.
  • the terminal device receives the RRC rejection message from the RAN device.
  • the RRC reject message is used by the RAN device to indicate rejection of the RRC request of the terminal device.
  • the RRC reject message includes second information, and the second information includes the cell identity of the DCC cell and part of the SI of the DCC cell.
  • the partial SI of the DCC cell includes the RMSI of the DCC cell, and may also include the OSI of the DCC cell.
  • the second information may include the cell identity of each DCC cell in one or more DCC cells and the partial SI of each DCC cell.
  • the partial SI of the DCC cell includes the RMSI of the DCC cell, and further, may also include the OSI of the DCC cell.
  • the RRC reject message is an RRC reject (RRCReject) message or an RRC connection reject (RRCConnectionReject) message.
  • the terminal device performs contention-based random access, that is, if multiple terminal devices select the same random access preamble in step S401 and send them on the same PRACH resource With the random access preamble, the random access of these terminal devices may conflict and need to be resolved by contention.
  • the terminal device that succeeds in the competition correctly receives the message in step S404, and the terminal device that fails in the competition cannot decode the message in step S404 and needs to initiate random access again.
  • the above steps S401 and S402 are optional, and are used in the process of the terminal device randomly accessing the RAN device. If the terminal device accesses the RAN device through other methods and establishes an RRC connection, the above steps S401 and S402 may not be performed.
  • the first information included in the RRC request message is used to indicate one or more DCC cells.
  • the first information may include cell identities of one or more DCC cells.
  • the first information is equivalent to indicating which DCC cell(s) the terminal device expects to access.
  • the terminal device before the terminal device accesses the BCC cell, it searches for a DCC cell.
  • the terminal device can carry the cell identity of the DCC cell in the RRC request message when establishing an RRC connection with the BCC cell to indicate that the terminal device expects to access The DCC cell.
  • the second information includes the cell identity of each DCC cell in the one or more DCC cells and the partial SI of each DCC cell.
  • the second information only includes part of the SI of each DCC cell in the one or more DCC cells.
  • the first information contains the cell identity of a DCC cell
  • the second information does not contain the cell identity of the DCC cell; or the first information contains the cell identities of multiple DCC cells, and the second information contains the multiple DCCs
  • the sequence of the partial SI of each DCC cell in the cell corresponds to the sequence of the cell identities of the multiple DCC cells in the first information
  • the second information may not include the cell identities of the multiple DCC cells.
  • the information of one or more DCC cells contained in the second information may be part or all of the information of one or more DCC cells contained in the first information; in addition, the second information The information of the one or more DCC cells contained in may also not correspond to the one or more DCC cells indicated in the first information.
  • the first information includes the identity of the second cell A and the identity of the second cell B; the information of the second cell contained in the second information may include the information of the second cell A or the second cell B, or The information of the second cell A and the second cell B may also include the information of the second cell C.
  • step S401 the terminal device sends a random access preamble to the DU trying to access.
  • step S402 the DU sends a random access response to the terminal device.
  • step S403 the terminal device sends an RRC request to the CU connected to the DU through the DU.
  • the terminal device sends an RRC request to the DU through the air interface, and the DU sends the RRC request to the CU through the F1-C interface.
  • step S404 the CU sends an RRC rejection to the terminal device through the DU.
  • the CU sends an RRC rejection to the DU through the F1-C interface, and then the DU sends the RRC rejection to the terminal device through the air interface.
  • steps S403 and S404 are interactions between the terminal device and the CU-CP of the CU.
  • the partial SI of the DCC cell is obtained when the UE accesses the RAN, thereby enabling the UE to access the DCC cell.
  • the terminal device may perform a cell reselection process and select a suitable cell for access.
  • the suitable cell may be a BCC cell or a DCC cell.
  • a BCC cell controlled by an eNB broadcasts a cell-specific reference signal (cell-specific reference signal, CRS), and a DCC cell controlled by a gNB broadcasts an SSB. If the terminal device detects that the signal strength of a DCC cell is higher than the CRS strength of the BCC cell that the terminal device tries to access, the terminal device can try to access the DCC cell.
  • the criteria for the terminal device to select a suitable cell may be based on the strength of the reference signal of each cell, or other criteria, for example, the terminal device preferentially selects a DCC cell, which is not specifically limited in this application.
  • Fig. 5 is a schematic flowchart of another method for a terminal device to randomly access a RAN device and establish an RRC connection provided by an embodiment of the application.
  • the method 500 can be applied to the eNB that the terminal equipment randomly accesses to LTE, and can also be applied to the ng-eNB of the eLTE or the gNB of NR that the terminal equipment randomly accesses.
  • the process described in Figure 5 includes the following steps:
  • the terminal device sends a random access preamble to the RAN device.
  • the RAN device receives the random access preamble from the terminal device.
  • the RAN device sends a random access response to the terminal device.
  • the terminal device receives the random access response from the RAN device.
  • steps S501 and S502 are similar to the steps S401 and S402 in the foregoing embodiment, and will not be repeated here. It should be noted that steps S501 and S502 are also optional.
  • the terminal device sends an RRC request message to the RAN device.
  • the RAN device receives the RRC request message from the terminal device.
  • the RRC request message is used by the terminal device to request to establish an RRC connection with the RAN device.
  • the RRC request message includes a first identifier, and the first identifier includes at least a part of an identifier of the terminal device.
  • the first identifier includes at least a part of the temporary terminal device identifiers provided by the 5G core network for the terminal device.
  • the 5G core network allocates a temporary terminal device identifier for the terminal device in the registered tracking area, such as the 5G system architecture evolution temporary mobile station Identifier (5G S-Temporary Mobile Subscription Identifier, 5G-S-TMSI).
  • the first identifier includes at least part of 5G-S-TMSI, that is, the first identifier may include part or all of 5G-S-TMSI, and may also include other information.
  • the RRC request message may be an RRC connection request (RRCConnectionRequest) message or an RRC setup request (RRCSetupRequest) message.
  • RRCConnectionRequest RRC connection request
  • RRCSetupRequest RRC setup request
  • the RAN device sends an RRC rejection message to the terminal device.
  • the terminal device receives the RRC rejection message from the RAN device.
  • step S504 is similar to the step S404 of the foregoing embodiment, and will not be repeated here.
  • steps S501 and S502 are interactions between the terminal device and the DU; steps S503 and S504 are interactions between the terminal device and the CU.
  • steps S503 and S504 are interactions between the terminal device and the CU-CP of the CU.
  • the terminal device can obtain the partial SI of the DCC cell when accessing the RAN, thereby enabling the terminal device to access the DCC cell. Since the terminal device has been registered in the 5G core network, only the first identifier of the terminal device needs to be carried in the RRC request, thereby saving air interface signaling overhead.
  • the terminal device may perform a cell reselection process and select a suitable cell for access.
  • the suitable cell may be a BCC cell or a DCC cell.
  • the BCC cell controlled by the eNB broadcasts the CRS
  • the DCC cell controlled by the gNB broadcasts the SSB. If the terminal device detects that the signal strength of a DCC cell is higher than the CRS strength of the BCC cell that the UE tries to access, the terminal device can try to access the DCC cell.
  • the criteria for the terminal device to select a suitable cell may be based on the strength of the reference signal of each cell, or other criteria, for example, the terminal device preferentially selects a DCC cell, which is not specifically limited in this application.
  • the terminal device obtains part of the SI of the DCC cell during the process of accessing the BCC cell to establish an RRC connection, so as to be able to access the DCC cell.
  • the terminal device when the terminal device is in the RRC connection state, that is, the terminal device has established an RRC connection with the BCC cell.
  • the terminal device can request the BCC cell to obtain part of the DCC cell. SI, or the BCC cell actively sends part of the SI of the DCC cell to the terminal device.
  • FIG. 6 is a schematic flowchart of a method for a terminal device to request a RAN device to send a partial SI of a DCC cell according to an embodiment of the application.
  • the terminal device in the RRC connected state expects to switch from the RRC connection of the BCC cell to the RRC connection of the DCC cell or increase the RRC connection of the DCC cell due to the quality of service (QoS) requirements of the service.
  • the terminal device can request the BCC cell to send part of the SI of the DCC cell.
  • the method 600 can be applied to the interaction between the terminal equipment and the eNB of LTE, the ng-eNB of eLTE, or the gNB of NR.
  • the process described in Figure 6 includes the following steps:
  • the terminal device sends an RRC re-establishment request message to the RAN device.
  • the RAN device receives the RRC re-establishment request message from the terminal device.
  • the RRC re-establishment request is used by the terminal device to request to re-establish an RRC connection with the RAN device.
  • the RRC re-establishment request message includes first information, and the first information is used to indicate that the terminal device expects to access the DCC cell. It should be noted that, before the terminal device sends the RRC re-establishment request message to the RAN device, the terminal device has established an RRC connection with the BCC cell controlled by the RAN device, and requests to re-establish the RRC connection with the BCC cell in this step.
  • the first information may use a one-bit information element to indicate whether the terminal device expects to access the DCC cell, for example, when the bit value is 1, it indicates that the terminal device expects to access the DCC cell, or when the bit value is 0, it indicates The terminal equipment expects to access the DCC cell.
  • the RRC reestablishment request message is an RRC reestablishment request (RRCReestablishmentRequest) message or an RRC connection reestablishment request (RRCConnectionReestablishmentRequest) message.
  • RRCReestablishmentRequest RRC reestablishment request
  • RRCConnectionReestablishmentRequest RRC connection reestablishment request
  • the RAN device sends an RRC re-establishment response message to the terminal device.
  • the terminal device receives the RRC re-establishment response message from the RAN device.
  • the RRC re-establishment response message includes second information, and the second information includes the cell identity of the DCC cell and the partial SI of the DCC cell. It should be noted that the second information may include the cell identity and part of the SI of each DCC cell in one or more DCC cells.
  • the RRC reestablishment response message is an RRC reestablishment (RRCReestablishment) message, an RRC establishment (RRCSetup) message, an RRC connection reestablishment (RRCConnectionReestablishment) message, or an RRC connection reestablishment rejection (RRCConnectionReestablishmentReject) message.
  • the first information included in the RRC re-establishment request message is used to indicate one or more DCC cells.
  • the first information may include cell identities of one or more DCC cells.
  • the first information is equivalent to indicating which DCC cell(s) the terminal device expects to access.
  • the terminal device searches for or detects a DCC cell before RRC re-establishment, so that the terminal device can carry the cell identity of the DCC cell in the RRC re-establishment request message when performing RRC re-establishment with the BCC cell to indicate to the terminal The device expects to access the DCC cell.
  • the second information includes the cell identity of each DCC cell in the one or more DCC cells and the partial SI of each DCC cell.
  • the second information only includes part of the SI of each DCC cell in the one or more DCC cells.
  • the first information contains the cell identity of a DCC cell
  • the second information does not contain the cell identity of the DCC cell; or the first information contains the cell identities of multiple DCC cells, and the second information contains the multiple DCCs
  • the sequence of the partial SI of each DCC cell in the cell corresponds to the sequence of the cell identities of the multiple DCC cells in the first information
  • the second information may not include the cell identities of the multiple DCC cells.
  • the information of one or more DCC cells contained in the second information may be part or all of the information of one or more DCC cells contained in the first information; in addition, the second information The information of the one or more DCC cells contained in may also not correspond to the one or more DCC cells indicated in the first information.
  • the first information includes the identity of the second cell A and the identity of the second cell B; the information of the second cell contained in the second information may include the information of the second cell A or the second cell B, or The information of the second cell A and the second cell B may also include the information of the second cell C.
  • steps S601 and S602 are interactions between the terminal device and the CU, and the CU is connected to the DU that has established an RRC connection with the terminal device.
  • the terminal device sends an RRC re-establishment request to the CU through the DU.
  • the terminal device sends an RRC re-establishment request to the DU through the air interface, and then the DU sends the RRC re-establishment request to the CU through the F1-C interface.
  • the CU sends an RRC re-establishment response to the terminal device through the DU.
  • the CU sends the RRC re-establishment response to the DU through the F1-C interface, and then the DU sends the RRC re-establishment response to the terminal device through the air interface.
  • steps S601 and S602 are interactions between the terminal device and the CU-CP of the CU.
  • the terminal device in the RRC connected state actively requests to obtain part of the SI of the DCC cell, thereby enabling the terminal device to access the DCC cell.
  • FIG. 7 is a schematic flowchart of a method for a RAN device to actively send a partial SI of a DCC cell to a terminal device according to an embodiment of the application.
  • a RAN device to actively send a partial SI of a DCC cell to a terminal device according to an embodiment of the application.
  • the BCC cell actively sends part of the SI of the DCC cell to the terminal equipment in the RRC connected state.
  • the method 700 can be applied to the interaction between the terminal equipment and the eNB of LTE, the ng-eNB of eLTE, or the gNB of NR.
  • the process described in Figure 7 includes the following steps:
  • the RAN device sends an RRC reconfiguration message to the terminal device.
  • the terminal device receives the RRC reconfiguration message from the RAN device.
  • the RRC reconfiguration is used to modify the RRC connection of the terminal device, such as establishing/modifying/releasing a radio bearer, establishing/modifying/releasing measurement, or adding/modifying/deleting secondary cells, etc.
  • the RRC reconfiguration message includes second information, and the second information includes the cell identity of the DCC cell and part of the SI of the DCC cell. It should be noted that the second information may include the cell identity of each DCC cell in one or more DCC cells and the partial SI of each DCC cell.
  • the RRC reconfiguration message is an RRC reconfiguration (RRCReconfiguration) message or an RRC connection reconfiguration request (RRCConnectionReconfiguration) message.
  • the terminal device sends an RRC reconfiguration response message to the RAN device.
  • the RAN device receives the RRC reconfiguration response message from the terminal device.
  • the terminal device confirms whether to successfully receive the RRC reconfiguration message by responding to the RRC reconfiguration message.
  • the response is included in an RRC reconfiguration complete (RRCReconfigurationComplete) message, may also be included in an RRC connection reconfiguration complete (RRCConnectionReconfigurationComplete) message, and may also be included in an RRC connection re-establishment (RRC connection re-establishment) message .
  • steps S701 and S702 are interactions between the terminal device and the CU, and the CU is connected to the DU that has established an RRC connection with the terminal device.
  • steps S701 and S702 are interactions between the terminal device and the CU-CP of the CU.
  • the BCC cell actively sends the SI of the DCC cell to the terminal device in the RRC connected state, thereby enabling the terminal device to access the DCC cell.
  • the BCC cell sends an RRC release message to the terminal equipment.
  • the RRC release message includes the above-mentioned second information.
  • the RRC release message is an RRC release (RRCRelease) message or an RRC connection release (RRCConnectionRelease) message.
  • the terminal equipment and the BCC cell interact through RRC signaling, so that the terminal equipment can obtain part of the SI of the DCC cell, so as to enable the terminal equipment to access the DCC cell.
  • the BCC cell may send part of the SI of the DCC cell in a broadcast manner.
  • the BCC cell includes the cell identity of the DCC cell and part of the SI of the DCC cell (that is, the above-mentioned second information) in the SI of the BCC cell to broadcast; or, the BCC cell broadcasts the second information through other broadcast channels .
  • the embodiment of the present application does not specifically limit how the BCC cell broadcasts the second information.
  • the BCC cell can broadcast the respective cell identities of one or more DCC cells and respective part of the SI.
  • the BCC cell needs to modify its own SI and notify the terminal device to read the modified SI.
  • the SI of the BCC cell includes the configuration of the SI modification period.
  • the BCC cell instructs the terminal equipment to modify the SI of the BCC cell in the PDCCH. After receiving the instruction, the terminal device reads the modified SI in the next SI modification period, that is, the SI of the BCC cell containing the second information.
  • the terminal device when it randomly accesses the BCC cell, it obtains the foregoing second information by sending a specific random access preamble.
  • the specific random access preamble refers to a preamble used to request SI.
  • the specific random access preamble can be used to request the SI of the DCC cell and can also be used to request the SI of the BCC cell.
  • the first random access preamble set used by the terminal device to request to obtain the SI of the BCC and/or DCC cell may be pre-configured through a standard protocol, terminal device subscription information, or other means.
  • the terminal device sends a specific random access preamble on a specific PRACH resource, and the specific PRACH resource is also pre-configured.
  • the terminal device and the RAN device obtain the first random access preamble set in advance, and may further obtain the PRACH resource pool for sending the specific random access preamble by the terminal device in advance.
  • the terminal device randomly accesses the BCC cell
  • the terminal device selects a specific random access preamble from the first random access preamble set and sends it to the RAN device on the specific PRACH resource.
  • the selection may be that the terminal device randomly selects one from the first random access preamble set, or it may be pre-configured for the terminal device by the RAN device, or may be selected by the terminal device using other criteria, which is not specifically limited in this application.
  • FIG. 8 is a schematic flowchart of a method for a terminal device to request an SI of a DCC cell from a RAN device according to an embodiment of the application.
  • the process of the method 800 includes the following steps:
  • the terminal device sends an SI request to the RAN device.
  • the RAN device receives the SI request from the terminal device.
  • the terminal device selects a specific random access preamble and sends the specific random access preamble to the RAN device.
  • the foregoing step S801 is similar to the foregoing step S401.
  • the specific random access preamble sent by the terminal device to the RAN device in this step is used to request SI.
  • the terminal device can also be referred to as the terminal device sending an SI request to the RAN device for requesting the SI of the DCC cell.
  • the SI request may also request the SI of the BCC cell controlled by the RAN device, for example, other SIBs in the SI of the BCC cell except SIB1.
  • the RAN device sends an SI request confirmation to the terminal device.
  • the terminal device receives the SI request confirmation from the RAN device.
  • the RAN device sends a random access response to the terminal device, and the random access response is used to indicate an acknowledgement for the SI request (acknowledgement for SI request).
  • the MAC layer sub-PDU of the RAN device for the terminal device in the random access response contains only the random access preamble identifier (RAPID) of the UE to indicate the SI request for the terminal device Confirmation.
  • RAPID random access preamble identifier
  • the RAN device sends the SI to the terminal device.
  • the terminal device receives the SI from the RAN device.
  • the RAN device sends SI to the UE on the scheduled resources.
  • the SI at least includes the cell identity of each DCC cell of one or more DCC cells and part of the SI of each DCC cell.
  • the SI may also include other SIBs other than SIB1 in the SI of the BCC cell controlled by the RAN device.
  • step S801 the terminal device sends a system information request to the DU.
  • step S802 the DU sends a system information request confirmation to the terminal device. If the system information is stored in the CU connected to the DU, in step S803, the CU connected to the DU sends system information to the terminal device through the DU; wherein, the CU sends the system information to the DU through the F1-C interface, and then the DU passes through The air interface sends the system information to the terminal device.
  • step S803 is that the CU-CP of the CU sends system information to the terminal device through the DU. If the system information is stored in the DU, in step S803, the DU sends the system information to the terminal device.
  • the terminal device can quickly obtain part of the SI of the DCC cell, thereby enabling the terminal device to access the DCC cell.
  • the terminal device can obtain the partial SI of the DCC cell before the RRC connection is established, thereby shortening the time for the terminal device to obtain the partial SI of the DCC cell, which is beneficial to shorten the time for the terminal device to access the network.
  • the foregoing multiple embodiments describe multiple ways of how the terminal device obtains the partial SI of the DCC cell from the BCC cell. It should be noted that before the RAN device controlling the BCC cell sends the partial SI of the DCC cell to the UE, the RAN device has already obtained the partial SI of one or more DCC cells.
  • the one or more DCC cells may have a neighboring cell relationship with the BCC cell.
  • the coverage of the DCC cell and the coverage of the BCC cell may partially or completely overlap.
  • the RAN device can obtain part of the SI of the DCC cell in many ways.
  • the RAN device can obtain and save the part of the SI of the DCC cell through the operation, administration and maintenance (OAM) system; or,
  • OAM operation, administration and maintenance
  • the BCC cell controlled by the RAN device and the adjacent DCC cell will establish an inter-cell interface (such as X2 interface or Xn interface) and update the interface during operation.
  • the RAN device can obtain part of the SI of the DCC cell through the inter-cell interface and Save; the RAN device can also obtain and save part of the SI of the DCC cell in other ways, which is not specifically limited in this application.
  • FIG. 9 is a schematic flowchart of a method for information exchange between a first RAN device controlling a DCC cell and a second RAN device controlling a BCC cell according to an embodiment of the application.
  • the process of the method 900 includes the following steps:
  • the first RAN device sends third information to the second RAN device, where the third information is used to indicate that one or more cells controlled by the first RAN device are DCC cells.
  • the second RAN device receives the third information from the first RAN device.
  • the first RAN device controlling the DCC cell indicates to the second RAN device controlling the BCC cell that the cell is a DCC cell.
  • the DCC cell and the BCC cell have a neighboring cell relationship.
  • the DCC cell may be any of the DCC cells shown in FIG. 3(b) to FIG. 3(d).
  • the third information may include the cell identity of at least one DCC cell.
  • the second RAN device knows which cell(s) controlled by the first RAN device is the DCC cell after receiving the third information.
  • the third information can also be indicated by other information that can identify the identity of the DCC cell, which is not specifically limited in this application. Further, the third information may also include an indication of what type of DCC cell the DCC cell is.
  • the DCC cell is a DCC cell that broadcasts SSB but does not broadcast RMSI and OSI (as shown in Figure 3(b)), or the DCC cell is a DCC cell that broadcasts SSB and OSI but does not broadcast RMSI (as shown in Figure 3(c)), Or the DCC cell is a DCC cell that does not broadcast public broadcast signaling (as shown in Figure 3(d)).
  • the third information includes a two-bit information element to indicate the type of the DCC cell.
  • the third information may be carried in a message with a cell identity that is exchanged between existing RAN devices.
  • the message sent by the existing first RAN device to the second RAN device includes the cell identity of at least one cell controlled by the first RAN device.
  • an information element corresponding to the cell identity of the cell can be added to the existing message to indicate the third information.
  • the third information may be a one-bit information element. For example, when the bit value is 1, it indicates that the cell is a DCC cell, or when the bit value is 0, it indicates that the cell is a DCC cell; further, the third information is also It may include an indication of what type of DCC cell the DCC cell is.
  • the third information may be transferred when the first RAN device and the second RAN device establish a RAN-side interface, or when the interface information between the first RAN device and the second RAN device is updated.
  • the third information is included in an Xn setup request (Xn setup request) message, and may also be included in an NG-RAN node configuration update (NG-RAN node configuration update) message.
  • the second RAN device sends a response of the third information to the first RAN device.
  • the first RAN device receives the response of the third information from the second RAN device.
  • the second RAN device confirms whether to successfully receive the third information sent by the first RAN device by responding to the third information.
  • the response may be included in an Xn setup response (Xn setup response) message, and may also be included in an NG-RAN node configuration update acknowledgement (NG-RAN node configuration update acknowledge) message.
  • step S902 is optional.
  • the second RAN device may save the correctly received third information.
  • the BCC cell can learn which DCC cells are around it, and further, can learn what type of DCC cell it is, and provide auxiliary information for the BCC cell to send partial SI of the DCC cell to the terminal device.
  • S903 The first RAN device sends second information to the second RAN device.
  • the second RAN device receives the second information from the first RAN device.
  • the second information includes the cell identity of the DCC cell and part of the SI of the DCC cell.
  • the partial SI of the DCC cell includes the RMSI of the DCC cell, and may also include the OSI of the DCC cell. It should be noted that the second information may include respective cell identities and respective partial SIs of one or more DCC cells controlled by the first RAN device.
  • the part of the SI information contained in the second information corresponds to the DCC cell type in S901.
  • the second information includes the RMSI of the DCC cell, and may further include OSI; for the type of DCC cell in Figure 3(c), the second information includes the RMSI of the DCC cell.
  • the second information may be transferred when the first RAN device and the second RAN device establish a RAN-side interface, or when the interface information between the first RAN device and the second RAN device is updated.
  • the second information is included in an Xn setup request (Xn setup request) message, and may also be included in an NG-RAN node configuration update (NG-RAN node configuration update) message.
  • the second RAN device sends a response of the second information to the first RAN device.
  • the first RAN device receives the response of the second information from the second RAN device.
  • the second RAN device confirms whether to successfully receive the second information sent by the first RAN device by responding to the second information.
  • the response may be included in an Xn setup response (Xn setup response) message, and may also be included in an NG-RAN node configuration update acknowledgement (NG-RAN node configuration update acknowledge) message.
  • step S904 is optional.
  • the second RAN device may save the second information that is correctly received.
  • the BCC cell can learn the partial SI of the DCC cell and enable the BCC cell to send the partial SI of the DCC cell to the terminal device.
  • step S901 and optional S902 are the first sub-process
  • step S903 and optional S904 are the second sub-process.
  • the first sub-process and the second sub-process can be executed independently.
  • the above two sub-processes can also be combined, that is, the first RAN device uses one message to send the third information and the second information to the second RAN device, and the second RAN device uses another message to send the third information and the second information to the first RAN device. Response to the second message.
  • the second information and the third information are stored on the CU connected to the DU controlling the DCC cell in the first RAN equipment, then in step In S901, the CU connected to the DU controlling the DCC cell in the first RAN device sends the third information to the CU connected to the DU controlling the BCC cell in the second RAN device through the Xn/X2 interface.
  • the CU of the second RAN device sends the third information to the DU of the second RAN device through the F1-C interface.
  • step S902 the CU connected to the DU controlling the BCC cell in the second RAN device sends a response of the third information to the CU connected to the DU controlling the DCC cell in the first RAN device through the Xn/X2 interface.
  • the DU of the second RAN device sends a response of the third information to the CU of the second RAN device through the F1-C interface
  • the CU of the second RAN device sends a response to the first RAN through the Xn/X2 interface.
  • the CU of the device sends a response with the third information.
  • the transfer process of the second information in step S903 is similar to the transfer process of the third information in step S901, and the transfer process of the second information response in step S904 is similar to the transfer process of the third information response in step S902.
  • the second information and the third information are stored on the DU that controls the DCC cell in the first RAN device.
  • the DU that controls the DCC cell in the first RAN device passes F1.
  • the -C interface sends the third information to the CU connected to the DU
  • the CU of the first RAN device sends the third information to the CU connected to the DU that controls the BCC cell in the second RAN device through the Xn/X2 interface.
  • the CU of the second RAN device sends the third information to the DU of the second RAN device through the F1-C interface.
  • the CU connected to the DU controlling the BCC cell in the second RAN device sends a response of the third information to the CU connected to the DU controlling the DCC cell in the first RAN device through the Xn/X2 interface, and then the second RAN device
  • the CU of a RAN device sends a response of the third information to the DU of the first RAN device through the F1-C interface.
  • the DU of the second RAN device sends a response of the third information to the CU of the second RAN device through the F1-C interface, and the CU of the second RAN device sends a response to the first RAN through the Xn/X2 interface.
  • the CU of the device sends a response with the third information
  • the CU of the first RAN device sends a response with the third information to the DU of the first RAN device through the Xn/X2 interface.
  • the transfer process of the second information in step S903 is similar to the transfer process of the third information in step S901
  • the transfer process of the second information response in step S904 is similar to the transfer process of the third information response in step S902. Go into details again.
  • steps executed by the CU in steps S901 to S904 are executed by the CU-CP of the CU. It should be noted that in the case where one of the two RAN devices is of the CU-CP architecture, steps S901 to S904 are interactions between one RAN device and the CU of the other RAN device, or the CU-CP of the other RAN device , This application will not repeat it.
  • the BCC cell obtains part of the SI of the DCC cell, and can send the part of the SI of the DCC cell to the terminal device in a variety of ways, thereby enabling the terminal device to access the DCC cell.
  • the BCC cell may instruct the DCC cell to switch to the BCC cell, which may also be referred to as the BCC cell to activate the DCC cell.
  • the BCC cell can instruct one or more of its neighboring DCC cells to convert to BCC cells, so that some terminal devices in the network can be accessed.
  • the second RAN device that controls the BCC cell can send fourth information to the first RAN device that controls the DCC cell.
  • the fourth information is used to indicate that the DCC cell is converted to a BCC cell.
  • the fourth information can also be considered to be used for Activate the DCC cell.
  • the fourth information may include the cell identity of the DCC cell. In this way, after the first RAN device receives the fourth information, it knows which DCC cell it controls to convert to a BCC cell.
  • the fourth information can also be indicated by other information that can identify the DCC cell, which is not specifically limited in this application.
  • the BCC cell may transfer the fourth information to the DCC cell through an NG-RAN node configuration update (NG-RAN node configuration update) message.
  • the DCC cell can also be confirmed through an NG-RAN node configuration update acknowledgement (NG-RAN node configuration update acknowledge) message.
  • the fourth information can be the interaction between the DU of the first RAN device and the DU of the second RAN device, or the DU of the first RAN device and the DU of the second RAN device.
  • the interaction between the CUs may also be the interaction between the CU of the first RAN device and the DU of the second RAN device, or the interaction between the CU of the first RAN device and the CU of the second RAN device.
  • the operations performed by the foregoing CU are performed by the CU-CP of the CU.
  • the above operation is between the DU of one RAN device and the DU of the other RAN device, or the CU of the other RAN device, or the CU-CP of the other RAN device.
  • Interactive Through this operation, the BCC cell can instruct the DCC cell to convert to the BCC cell, thereby enabling the access of the terminal device, which can help reduce the load of the existing BCC cell and improve the service quality of the terminal device.
  • the BCC cell may also instruct other BCC cells to switch to DCC cells, which may also be referred to as a BCC cell to deactivate another BCC cell.
  • the BCC cell can instruct one or more of its neighboring BCC cells to convert to DCC cells, thereby enabling some BCC cells in the network to achieve energy saving. Reduce network energy consumption.
  • the second RAN device that controls the BCC cell can send fifth information to the first RAN device that controls another BCC cell.
  • the fifth information is used to indicate that the BCC cell is converted to a DCC cell.
  • the fifth information may include the cell identity of the BCC cell.
  • the first RAN device After the first RAN device receives the fifth information, it knows which BCC cell it controls to convert to a DCC cell.
  • the fifth information can also be indicated by other information that can identify the BCC cell, which is not specifically limited in this application.
  • the BCC cell may transfer the fifth information to another BCC cell through an NG-RAN node configuration update (NG-RAN node configuration update) message.
  • NG-RAN node configuration update Another BCC cell can also be confirmed through an NG-RAN node configuration update acknowledgement (NG-RAN node configuration update acknowledge) message.
  • the fifth information can be the interaction between the DU of the first RAN device and the DU of the second RAN device, or the DU of the first RAN device and the DU of the second RAN device.
  • the interaction between the CUs may also be the interaction between the CU of the first RAN device and the DU of the second RAN device, or the interaction between the CU of the first RAN device and the CU of the second RAN device.
  • the operations performed by the foregoing CU are performed by the CU-CP of the CU.
  • the above operation is between the DU of one RAN device and the DU of the other RAN device, or the CU of the other RAN device, or the CU-CP of the other RAN device.
  • the BCC cell can instruct another BCC cell to switch to a DCC cell, thereby enabling the other BCC cell to achieve energy saving, thereby reducing network energy consumption.
  • 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 transmitted from a website, 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 or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk (SSD)).
  • SSD solid state disk
  • FIG. 10 shows a schematic block diagram of a terminal device 1000 according to an embodiment of the present application.
  • the terminal device 1000 may correspond to (for example, may be configured in or be itself) the terminal device described in the above method 400, or the terminal device described in the above method 500
  • the terminal device 1000 may include: a processor 1001 and a transceiver 1002, and the processor 1001 and the transceiver 1002 are communicatively coupled.
  • the terminal device 1000 further includes a memory 1003, and the memory 1003 is communicatively coupled with the processor 1001.
  • the processor 1001, the memory 1003, and the transceiver 1002 may be communicatively coupled, the memory 1003 may be used to store instructions, and the processor 1001 may be used to execute instructions stored in the memory 1003 to control the transceiver 1002 to receive and/or Send information or signals.
  • the processor 1001 and the transceiver 1002 are respectively configured to execute the terminal device described in the above method 400, or the terminal device described in the above method 500, or the terminal device described in the above method 600, or the terminal device described in the above method 700.
  • detailed descriptions are omitted.
  • FIG. 11 shows another schematic block diagram of a terminal device 1100 according to an embodiment of the present application.
  • the terminal device 1100 may correspond to (for example, may be configured in or be itself) the terminal device described in the above method 400, or the above method 500
  • the terminal device 1100 may include a receiving module 1101, a processing module 1102, and a sending module 1103, and the processing module 1102 is communicatively coupled with the receiving module 1101 and the sending module 1103, respectively.
  • the terminal device 1100 may adopt the form shown in FIG. 10.
  • the processing module 1102 may be implemented by the processor 1001 in FIG.
  • the terminal device 1100 may further include a storage unit for storing programs or data to be executed by the processing module 1102, or storing information received through the receiving module 1101 and/or sent through the sending module 1103.
  • Each module or unit in the terminal device 1100 is used to execute the terminal device described in the above method 400, or the terminal device described in the above method 500, or the terminal device described in the above method 600, or the terminal described in the above method 700, respectively.
  • detailed descriptions are omitted.
  • FIG. 12 shows a schematic block diagram of a first RAN device 1200 according to an embodiment of the present application.
  • the first RAN device 1200 may correspond to (for example, may be configured in or be itself) the first RAN device described in the above method 900, Or the RAN device that controls the DCC cell described in other embodiments.
  • the first RAN device 1200 may include: a processor 1201 and a transceiver 1202, and the processor 1201 and the transceiver 1202 are communicatively coupled.
  • the first RAN device 1200 further includes a memory 1203, and the memory 1203 is communicatively coupled with the processor 1201.
  • the processor 1201, the memory 1203, and the transceiver 1202 may be communicatively coupled, the memory 1203 may be used to store instructions, and the processor 1201 may be used to execute instructions stored in the memory 1203 to control the transceiver 1202 to receive and/or Send information or signals.
  • the processor 1201 and the transceiver 1202 are respectively configured to execute various actions or processes performed by the first RAN device described in the above method 900, or the RAN device that controls the DCC cell described in other embodiments.
  • the first RAN device 1200 is a CU-DU separated architecture
  • the first RAN device 1200 shown in FIG. 12 may be the CU of the first RAN device 1200, or the DU of the first RAN device 1200, or the first RAN The CU-CP of the device 1200.
  • FIG. 13 shows another schematic block diagram of the first RAN device 1300 according to an embodiment of the present application.
  • the first RAN device 1300 may correspond to (for example, may be configured in or be itself) the first RAN described in the above method 900 Device, or the RAN device that controls the DCC cell described in other embodiments.
  • the first RAN device 1300 may include: a receiving module 1301, a processing module 1302, and a sending module 1303, and the processing module 1302 is communicatively coupled with the receiving module 1301 and the sending module 1303, respectively.
  • the first RAN device 1300 may adopt the form shown in FIG. 12.
  • the processing module 1302 may be implemented by the processor 1201 in FIG.
  • the first RAN device 1300 may further include a storage unit for storing programs or data to be executed by the processing module 1302, or storing information received through the receiving module 1301 and/or sent through the sending module 1303.
  • the modules or units in the first RAN device 1300 are respectively used to execute the actions or processes performed by the first RAN device described in the above method 900 or the RAN device that controls the DCC cell described in other embodiments.
  • the first RAN device 1300 shown in FIG. 13 may be the CU of the first RAN device 1300, or the DU of the first RAN device 1300, or the first RAN The CU-CP of the device 1300.
  • FIG. 14 shows a schematic block diagram of a second RAN device 1400 according to an embodiment of the present application.
  • the second RAN device 1400 may correspond to (for example, may be configured in or be itself) the RAN device described in the foregoing method 400, or the foregoing The RAN device described in the method 500, or the RAN device described in the foregoing method 600, or the RAN device described in the foregoing method 700, or the RAN device described in the foregoing method 800, the second RAN device described in the foregoing method 900, or The RAN device that controls the BCC cell described in other embodiments.
  • the second RAN device 1400 may include: a processor 1401 and a transceiver 1402, and the processor 1401 and the transceiver 1402 are communicatively coupled.
  • the second RAN device 1400 further includes a memory 1403, and the memory 1403 is communicatively coupled with the processor 1401.
  • the processor 1401, the memory 1403, and the transceiver 1402 may be communicatively coupled, the memory 1403 may be used to store instructions, and the processor 1401 may be used to execute instructions stored in the memory 1403 to control the transceiver 1402 to receive and/or Send information or signals.
  • the processor 1401 and the transceiver 1402 are respectively configured to execute the RAN device described in the foregoing method 400, or the RAN device described in the foregoing method 500, or the RAN device described in the foregoing method 600, or the RAN device described in the foregoing method 700, respectively.
  • the second RAN device 1400 is a CU-DU separated architecture
  • the second RAN device 1400 shown in FIG. 14 may be the CU of the second RAN device 1400, or the DU of the second RAN device 1400, or the second RAN The CU-CP of the device 1400.
  • FIG. 15 shows another schematic block diagram of a second RAN device 1500 according to an embodiment of the present application.
  • the second RAN device 1500 may correspond to (for example, may be configured in or be itself) the RAN device described in the above method 400, Or the RAN device described in the foregoing method 500, or the RAN device described in the foregoing method 600, or the RAN device described in the foregoing method 700, or the RAN device described in the foregoing method 800, or the second RAN device described in the foregoing method 900 , Or the RAN device that controls the BCC cell described in other embodiments.
  • the second RAN device 1500 may include: a receiving module 1501, a processing module 1502, and a sending module 1503, and the processing module 1502 is communicatively coupled with the receiving module 1501 and the sending module 1503, respectively.
  • the second RAN device 1500 may take the form shown in FIG. 14.
  • the processing module 1502 may be implemented by the processor 1401 in FIG. 14, and the receiving module 1501 and/or the sending module 1503 may be implemented by the transceiver 1402 in FIG. 14.
  • the second RAN device 1500 may further include a storage unit for storing programs or data to be executed by the processing module 1502, or storing information received through the receiving module 1501 and/or sent through the sending module 1503.
  • Each module or unit in the second RAN device 1500 is used to execute the RAN device described in the foregoing method 400, or the RAN device described in the foregoing method 500, or the RAN device described in the foregoing method 600, or the foregoing method 700.
  • the second RAN device 1500 shown in FIG. 15 may be the CU of the second RAN device 1500, or the DU of the second RAN device 1500, or the second RAN The CU-CP of the device 1500.
  • the processor (1001, 1201, 1401) in the device embodiment of the present application may be a central processing unit (CPU), a network processor (NP), a hardware chip, or any combination thereof.
  • the aforementioned hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD) or a combination thereof.
  • ASIC application-specific integrated circuit
  • PLD programmable logic device
  • the above-mentioned PLD may be a complex programmable logic device (CPLD), a field-programmable gate array (FPGA), a generic array logic (GAL), or any combination thereof.
  • the memory (1003, 1203, 1403) in the device embodiment of the present application may be a volatile memory (volatile memory), such as a random-access memory (RAM); it may also be a non-volatile memory (non-volatile memory).
  • volatile memory such as a random-access memory (RAM); it may also be a non-volatile memory (non-volatile memory).
  • -Volatile memory such as read-only memory (ROM), flash memory (flash memory), hard disk drive (HDD) or solid-state drive (SSD); it can also be the above The combination of types of memory.
  • the disclosed device and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or integrated. To another system, or some features can be ignored, or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication coupling may be indirect coupling or communication coupling through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • the functional units in the various embodiments of this patent application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the function is realized in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium.
  • the technical solution of this patent application can be embodied in the form of a software product in essence or a part that contributes to the existing technology or a part of the technical solution, and the computer software product is stored in a storage medium. It contains several instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods of the various embodiments of the patent application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (read-only memory, ROM), random access memory (random access memory, RAM), magnetic disks or optical disks and other media that can store program codes. .

Abstract

本申请实施例提供一种系统信息的传递方法。该方法包括：终端设备向无线接入网RAN设备发送第一请求，第一请求用于终端设备与RAN设备控制的第一小区建立无线资源控制RRC连接；其中，第一请求包含第一信息，第一信息用于指示以下至少一项：该终端设备期望接入第二小区、该终端设备期望接入的第二小区、该终端设备的至少部分标识。终端设备接收来自RAN设备的第一响应，其中，第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息。利用该方法，能有效使能终端设备接入第二小区。

Description

一种系统信息的传递方法和装置 技术领域
本发明涉及无线通信领域，尤其涉及一种系统信息的传递方法和装置。
背景技术
随着无线通信技术的飞速发展，第五代(5th Generation,5G)无线通信技术已是目前业界的热点。5G将支持多样化的应用需求，其中包括支持更高速率体验和更大带宽的接入能力、更低时延和高可靠的信息交互、以及更大规模且低成本的机器类通信设备的接入和管理等。支持各种垂直行业的泛在需求并保证节能是5G得以应用的关键因素。
终端设备接入移动网络时，会在一定的频率范围内搜索并接入一个载频上的小区，该载频也可称为载波。终端设备使用该载波所对应的一定的带宽范围内的资源与移动网络进行数据通信，该带宽范围可以包含多个子载波。通常地，一个小区在其载波对应的部分子载波上发送公共广播信令，例如同步信号和系统信息等，以使得终端设备可以接入该小区。终端设备通过同步信号实现与小区的同步，通过读取系统信息以获取接入小区的必要信息，从而接入小区。对于一些小区，由于节能的需要，可以不发送部分公共广播信令甚至不发送公共广播信令，例如可以发送部分系统信息，或者完全不发送系统信息，或者更进一步不发送同步信号，以减少发射机的功耗和发射时间。对于这些小区，如何使得终端设备能接入，目前尚未有适当的解决方案。
发明内容
本申请实施例提供一种系统信息的传递方法，有效使能终端设备对节能小区的接入。
以下从多个方面介绍本申请，容易理解的是，该以下多个方面的实现方式可互相参考。
第一方面，本申请提供一种用于系统信息的传递方法，包括：终端设备向无线接入网RAN设备发送第一请求，该第一请求包含第一信息，该第一信息用于指示以下至少一项：该终端设备期望接入第二小区、该终端设备期望接入的第二小区、该终端设备的至少部分标识，该第一请求用于该终端设备与该RAN设备控制的第一小区建立无线资源控制RRC连接；该终端设备接收来自RAN设备的该第一请求的第一响应，该第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI。
可见，本申请实施例提供的方法实现了终端设备在接入RAN时获取第二小区的部分SI，从而使能终端设备接入第二小区。
在一种可能的实现方式中，在该终端设备向无线接入网RAN设备发送第一请求之前，该方法还包括：该终端设备向该RAN设备发送随机接入前导；该终端设备接收来自该RAN设备的随机接入响应。
通过该步骤，实现终端设备在随机接入第一小区时获取第二小区的部分SI。
在一种可能的实现方式中，在该第一信息用于指示终端设备期望接入的第二小区的情况下，该第一信息包含一个或多个第二小区的标识。
通过该方式，终端设备在接入第一小区时告知期望接入的第二小区，使得第一小区可以将终端设备所期望的特定的第二小区的部分SI发送给终端设备，提高信息传递的效率。
在一种可能的实现方式中，在该第一信息用于指示该终端设备的至少部分标识的情况下，该第一信息包含5G核心网为该终端设备提供的临时终端设备标识中的至少部分标识。
通过该方式，使得终端设备在RRC请求中只需要携带终端设备的至少部分标识，从而节省了空口信令开销。
在一种可能的实现方式中，该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
在一种可能的实现方式中，该第一信息用于至少部分标识该终端设备，包括：该第一信息包含第五代5G核心网为该终端设备提供的临时终端设备标识中的至少部分标识。
在一种可能的实现方式中，该第二小区的部分系统信息，包括该第二小区的剩余最小系统信息RMSI。
在一种可能的实现方式中，该第二小区的部分系统信息，包括该第二小区的RMSI和其他系统信息OSI。
在一种可能的实现方式中，该第一请求是RRC连接请求消息或RRC建立请求消息。
在一种可能的实现方式中，该第一响应是RRC拒绝消息或RRC连接拒绝消息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该终端设备向无线接入网RAN设备发送第一请求，包括该终端设备通过该RAN设备的分布式单元DU向该RAN设备的集中单元CU发送该第一请求；该终端设备接收来自RAN设备的该第一请求的第一响应，包括该终端设备接收来自该CU通过该DU发送的该第一响应；该DU与该CU连接。
第二方面，本申请提供一种用于系统信息的传递方法，包括：无线接入网RAN设备接收来自终端设备的第一请求，该第一请求包含第一信息，该第一信息用于指示以下至少一项：该终端设备期望接入第二小区、该终端设备期望接入的第二小区、该终端设备的至少部分标识，该第一请求用于该终端设备与该RAN设备控制的第一小区建立无线资源控制RRC连接；该RAN设备向该终端设备发送该第一请求的第一响应，该第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
可见，本申请实施例提供的方法实现了终端设备在接入RAN时获取第二小区的部分SI，从而使能终端设备接入第二小区。
在一种可能的实现方式中，在该RAN设备接收来自终端设备的第一请求之前，该方法还包括：该RAN设备接收来自该终端设备的随机接入前导；该RAN设备向该终端设备发送随机接入响应。
通过该步骤，实现终端设备在初始接入第一小区时获取第二小区的部分SI。
在一种可能的实现方式中，在该第一信息用于指示终端设备期望接入的第二小区的情况下，该第一信息包含一个或多个第二小区的标识。
通过该步骤，终端设备在接入第一小区时告知期望接入的第二小区，使得第一小区可以将终端设备所期望的特定的第二小区的部分SI发送给终端设备，提高信息传递的效率。
在一种可能的实现方式中，在该第一信息用于指示该终端设备的至少部分标识的情况下，该第一信息包含5G核心网为该终端设备提供的临时终端设备标识中的至少部分标识。
通过该方式，使得终端设备在RRC请求中只需要携带终端设备的至少部分标识，从而节省了空口信令开销。
在一种可能的实现方式中，在该无线接入网RAN设备接收来自终端设备的第一请求之前，该方法还包括：该RAN设备获取该一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
在一种可能的实现方式中，该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
在一种可能的实现方式中，该第一信息用于至少部分标识该终端设备，包括：该第一信息包含第五代5G核心网为该终端设备提供的临时终端设备标识中的至少部分标识。
在一种可能的实现方式中，该第二小区的部分系统信息，包括该第二小区的剩余最小系统信息RMSI。
在一种可能的实现方式中，该第二小区的部分系统信息，包括该第二小区的RMSI和其他系统信息OSI。
在一种可能的实现方式中，该第一请求是RRC连接请求消息或RRC建立请求消息。
在一种可能的实现方式中，该第一响应是RRC拒绝消息或RRC连接拒绝消息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该无线接入网RAN设备接收来自终端设备的第一请求，包括该RAN设备的集中单元CU通过分布式单元DU接收来自该终端设备的该第一请求；该RAN设备向该终端设备发送该第一请求的第一响应，包括该CU通过该DU向该终端设备发送该第一响应；该DU与该CU连接。
第三方面，本申请提供一种用于系统信息的传递方法，包括：终端设备向无线接入网RAN设备发送无线资源控制RRC重建立请求，该RRC重建立请求包含第一信息，该第一信息用于指示以下至少一项：该终端设备期望接入第二小区、该终端设备期望接入的第二小区，该第一请求用于该终端设备与该RAN设备控制的第一小区进行RRC重建立；该终端设备接收来自该RAN设备的RRC重建立响应消息，该RRC重建立响应消息包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI。
可见，本申请实施例提供的方法实现了处于RRC连接态的终端设备主动请求获取DCC小区的部分SI，从而使能终端设备接入DCC小区。
在一种可能的实现方式中，在该第一信息用于指示终端设备期望接入的第二小区的情况下，该第一信息包含一个或多个第二小区的标识。
通过该方式，终端设备在RRC重建立时告知期望接入的第二小区，使得第一小区可以将终端设备所期望的特定的第二小区的部分SI发送给终端设备，提高信息传递的效率。
在一种可能的实现方式中，该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该终端设备向无线接入网RAN设备发送RRC重建立请求，包括该终端设备通过该RAN设备的分布式单元DU向该RAN设备的集中单元CU发送该RRC重建立请求；该终端设备接收来自该RAN设备的RRC重建立响应消息，包括该终端设备接收来自该CU通过该DU发送的该RRC重建立响应消息；该DU与该CU连接。
第四方面，本申请提供一种用于系统信息的传递方法，包括：无线接入网RAN设备接收来自终端设备的无线资源控制RRC重建立请求，该RRC重建立请求包含第一信息，该第一信息用于指示以下至少一项：该终端设备期望接入第二小区、该终端设备期望接入的第二小区，该第一请求用于该终端设备与该RAN设备控制的第一小区进行RRC重建立；该RAN设备向该终端设备发送RRC重建立响应消息，该RRC重建立响应消息包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI。
可见，本申请实施例提供的方法实现了处于RRC连接态的终端设备主动请求获取DCC小区的部分SI，从而使能终端设备接入DCC小区。
在一种可能的实现方式中，在该第一信息用于指示终端设备期望接入的第二小区的情况下，该第一信息包含一个或多个第二小区的标识。
通过该方式，终端设备在RRC重建立时告知期望接入的第二小区，使得第一小区可以将终端设备所期望的特定的第二小区的部分SI发送给终端设备，提高信息传递的效率。
在一种可能的实现方式中，该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该无线接入网RAN设备接收来自终端设备的RRC重建立请求，包括该RAN设备的集中单元CU通过分布式单元DU接收来自该终端设备的该RRC重建立请求；该RAN设备向该终端设备发送RRC重建立响应消息，包括该CU通过该DU向该终端设备发送该RRC重建立响应消息；该DU与该CU连接。
第五方面，本申请提供一种用于系统信息的传递方法，包括：终端设备接收无线接入网RAN设备发送的无线资源控制RRC重配置消息，该RRC重配置消息包含第二信息，该第二信息包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI，该终端设备与该RAN设备控制的第一小区建立了RRC连接；该终端设备向该RAN设备发送RRC重配置响应消息。
通过本申请实施例上述步骤，实现第一小区主动向处于RRC连接态的终端设备发送第二小区的SI，从而使能终端设备接入第二小区。
在一种可能的实现方式中，该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该终端设备接收来RAN设备的RRC重配置消息，包括该终端设备接收该RAN设备的集中单元CU通过分布式单元DU向该终端设备发送的该RRC重配置消息；该终端设备向该RAN设备RRC重配置响应消息，包括该终端设备通过该DU向该CU发送该RRC重配置响应消息；该DU与该CU连接。
第六方面，本申请提供一种用于系统信息的传递方法，包括：无线接入网RAN设备向终端设备发送无线资源控制RRC重配置消息，该RRC重配置消息包含第二信息，该第二信息包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI，该终端设备与该RAN设备控制的第一小区建立了RRC连接；该RAN设备接收来自该终端设备的RRC重配置响应消息。
通过本申请实施例上述步骤，实现第一小区主动向处于RRC连接态的终端设备发送第二小区的SI，从而使能终端设备接入第二小区。
在一种可能的实现方式中，该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该RAN设备向终端设备发送RRC重配置消息，包括该RAN设备的集中单元CU通过分布式单元DU向该终端设备发送的该RRC重配置消息；该RAN设备接收来自该终端设备的RRC重配置响应消息，包括该CU通过该DU接收来自该终端设备的RRC重配置响应消息；该DU与 该CU连接。
第七方面，本申请提供一种用于系统信息的传递方法，包括：第一无线接入网RAN设备向第二RAN设备发送第二信息，该第二信息用于指示该第一RAN设备所控制的一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI；该第一RAN设备接收来自该第二RAN设备的该第二信息的响应；该第二RAN设备控制一个或多个第一小区；该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
通过本申请实施例上述步骤，第一小区可以获知第二小区的部分SI，使能第一小区向终端设备发送第二小区的部分SI。
在一种可能的实现方式中，该第一RAN设备向该第二RAN设备发送第三信息，该第三信息用于指示该第一RAN设备所控制的一个或多个小区为第二小区。
在一种可能的实现方式中，该第一RAN设备接收来自该第二RAN设备的第三信息的响应。
通过该方式，第一小区可以获知其周围有哪些第二小区，为第一小区向终端设备发送第二小区的部分SI提供辅助信息。
在一种可能的实现方式中，第三信息包含用于指示该第二小区为何种类型的第二小区的信息。
通过该方式，第一小区可以获知第二小区是何种类型的第二小区，进一步为第一小区向终端设备发送第二小区的部分SI提供辅助信息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该第一RAN设备的集中单元CU向该第二RAN设备发送该第二信息；该第一RAN设备的CU接收来自该第二RAN设备的该第二信息的响应。
第八方面，本申请提供一种用于系统信息的传递方法，包括：第二无线接入网RAN设备接收来自第一RAN设备的第二信息，该第二信息用于指示该第一RAN设备所控制的一个或多个第二小区中各个第二小区的小区标识和部分系统信息SI；该第二RAN设备向该第一RAN设备发送该第二信息的响应；该第二RAN设备控制一个或多个第一小区；该第一小区发送该终端设备初始接入该第一小区所需的系统信息，该第二小区部分发送或不发送该终端设备初始接入该第二小区所需的系统信息。
通过本申请实施例上述步骤，第一小区可以获知第二小区的部分SI，使能第一小区向终端设备发送第二小区的部分SI。
在一种可能的实现方式中，该第二RAN设备接收来自该第一RAN设备的第三信息，该第三信息用于指示该第一RAN设备所控制的一个或多个小区为第二小区。
在一种可能的实现方式中，该第二RAN设备向该第一RAN设备发送第三信息的响应。
通过该方式，第一小区可以获知其周围有哪些第二小区，为第一小区向终端设备发送第二小区的部分SI提供辅助信息。
在一种可能的实现方式中，第三信息包含用于指示该第二小区为何种类型的第二小区的信息。
通过该方式，第一小区可以获知第二小区是何种类型的第二小区，进一步为第一小区向终端设备发送第二小区的部分SI提供辅助信息。
在一种可能的实现方式中，该第一小区和/或第二小区是新无线NR小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是LTE小区(或gNB控制的小区)。
在一种可能的实现方式中，该第一小区和/或第二小区是eLTE小区(或ng-eNB控制的小区)。
在一种可能的实现方式中，该第二RAN设备的集中式单元DU通过该DU连接的集中单元CU接收来 自该第二RAN设备的该第二信息；该第二RAN设备的该DU通过该CU向该第二RAN设备发送该第二信息的响应。
第九方面，提供了一种终端设备，用于执行第一方面或第一方面的任一种可能的实现方式、或第三方面或第三方面的任一种可能的实现方式中的方法、或第五方面或第五方面的任一种可能的实现方式中的方法，具体地，该终端设备可以包括用于执行第一方面或第一方面的任一种可能的实现方式、或第三方面或第三方面的任一种可能的实现方式、或第五方面或第五方面的任一种可能的实现方式中的方法的单元。
第十方面，提供了一种无线接入网RAN设备，用于执行第二方面或第二方面的任一种可能的实现方式、或第四方面或第四方面的任一种可能的实现方式、或第六方面或第六方面的任一种可能的实现方式、或第七方面或第七方面的任一种可能的实现方式、或第八方面或第八方面的任一种可能的实现方式中的方法，具体地，该RAN设备可以包括用于执行第二方面或第二方面的任一种可能的实现方式、或第四方面或第四方面的任一种可能的实现方式、或第六方面或第六方面的任一种可能的实现方式、或第七方面或第七方面的任一种可能的实现方式、或第八方面或第八方面的任一种可能的实现方式中的方法的单元。
第十一方面，提供了一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码被通信设备(例如，接入网设备或终端设备)的通信单元、处理单元或收发器、处理器运行时，使得通信设备执行第一至第八方面或第一至第八方面的任一种可能的实现方式中的方法。
第十二方面，提供了一种计算机可读存储介质，该计算机可读存储介质存储有程序，该程序使得计算机执行第一至第八方面或第一至第八方面的任一种可能的实现方式中的方法。
第九方面，本申请实施例提供的一种芯片，所述芯片与存储器耦合，执行本申请实施例第一方面或第一方面的任一种可能的设计、第二方面或第二方面的任一种可能的设计、第三方面或第三方面的任一种可能的设计、第四方面或第四方面的任一种可能的设计、第五方面或第五方面的任一种可能的设计、第六方面或第六方面的任一种可能的设计、第七方面或第七方面的任一种可能的设计、第八方面或第八方面的任一种可能的设计的方法。
本发明的这些和其他方面在以下(多个)实施例的描述中会更加简明易懂。
附图说明
下面对本申请实施例或现有技术描述中使用的附图作简单地介绍：
图1是本申请实施例提供的一种的无线通信系统示意图；
图2是本申请实施例提供的一种划分为CU和DU的gNB的架构示意图；
图3是本申请实施例提供的一种NR中BCC小区和DCC小区的物理帧信息发送的差异示意图；
图4是本申请实施例提供的一种终端设备随机接入RAN设备并建立RRC连接的方法流程示意图；
图5是本申请实施例提供的另一种终端设备随机接入RAN设备并建立RRC连接的方法流程示意图；
图6是本申请实施例提供的一种终端设备请求RAN设备发送DCC小区的部分SI的方法流程示意图；
图7是本申请实施例提供的一种RAN设备向终端设备主动发送DCC小区的部分SI的方法流程示意图；
图8是本申请实施例提供的一种终端设备向RAN设备请求DCC小区的SI的方法流程示意图；
图9是本申请实施例提供的一种控制DCC小区的第一RAN设备与控制BCC小区的第二RAN设备之间的信息交互方法流程示意图；
图10是本申请实施例提供的终端设备的一种示意性框图；
图11是本申请实施例提供的终端设备的另一种示意性框图；
图12是本申请实施例提供的第一网络设备的一种示意性框图；
图13是本申请实施例提供的第一网络设备的另一种示意性框图；
图14是本申请实施例提供的第二网络设备的一种示意性框图；
图15是本申请实施例提供的第二网络设备的另一种示意性框图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例进行描述。
在本申请中，“示例性”一词用来表示“用作例子、例证或说明”。本申请中被描述为“示例性”的任何实施例不一定被解释为比其它实施例更优选或更具优势。为了使本领域任何技术人员能够实现和使用本发明，给出了以下描述。在以下描述中，为了解释的目的而列出了细节。应当明白的是，本领域普通技术人员可以认识到，在不使用这些特定细节的情况下也可以实现本发明。在其它实例中，不会对公知的结构和过程进行详细阐述，以避免不必要的细节使本发明的描述变得晦涩。因此，本发明并非旨在限于所示的实施例，而是与符合本申请所公开的原理和特征的最广范围相一致。
本申请的说明书和权利要求书及上述附图中的术语“第一”、“第二”、“第三”、“第四”等(如果存在)是用于区别类似的对象，而不必用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便这里描述的本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施。此外，术语“包括”和“具有”以及他们的任何变形，意图在于覆盖不排他的包含，例如，包含了一系列步骤或单元的过程、方法、系统、产品或设备不必限于清楚地列出的那些步骤或单元，而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它步骤或单元。
本文中术语“系统”和“网络”在本文中常被可互换使用。
下面以具体地实施例对本发明的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。
本申请实施例的技术方案可以应用于各种无线通信系统，例如：长期演进(Long Term Evolution,LTE)系统、第五代(5th generation,5G)移动通信系统、新无线(new radio,NR)通信系统、下一代(next generation,NG)通信系统以及未来的移动通信系统等。
在无线通信系统中，一个终端设备通过无线链路与无线接入网(radio access network,RAN)设备连接,并经由RAN设备所连接的核心网(core network,CN)设备实现与其他终端设备的通信或接入无线互联网等。通常地，一个终端设备与一个RAN设备无线连接以实现通信。进一步地，一个终端设备还可与两个或两个以上的RAN设备无线连接以实现通信。图1示出了本申请实施例提供的一种无线通信系统100示意图。其中，终端设备120通过空口160与RAN设备140进行无线连接。可选地，该无线通信系统还包括终端设备120通过空口162与RAN设备142进行无线连接。在一种可能的实现方式中，终端设备120与核心网180之间的数据传输可以通过RAN设备140与核心网180之间的接口进行传输，终端设备120与RAN设备142之间的数据通过RAN设备140与RAN设备142之间的接口经由RAN设备140实现与核心网180的传输；在另一种可能的实现方式中，终端设备120与核心网180之间的数据传输可以分别通过RAN设备140与核心网180之间的接口以及RAN设备142与核心网180之间的接口进行传输。需要说明的是，图1中RAN设备140和RAN设备142可以分别部署在不同的地理位置；也可以部署在同一地理位置，即RAN设备140和RAN设备142是共站点部署。
在实际系统中，图1所示的RAN设备可以是下一代基站，如下一代节点B(next-generation Node B,gNB)或下一代演进型节点B(next-generation evolved Node B,ng-eNB)等，还可以是无线局域网(Wireless Local Area Networks,WLAN)中的接入点(access point,AP)、或者LTE中的演进型基站(evolved Node B,eNB或eNodeB)，或者中继站或接入点，或者车载设备、可穿戴设备以及传输与接收点(transmission and reception  point,TRP)等。应理解，终端设备通过RAN设备所管理的一个或多个小区使用的传输资源(例如，频域资源、时域资源、码域资源等)与RAN设备进行通信，该小区可以属于宏小区(macro cell)，超级小区(hyper cell)，也可以属于小小区(small cell)，这里的小小区可以包括：城市小区(metro cell)、微小区(micro cell)、微微小区(pico cell)、毫微微小区(femto cell)等，这些小小区具有覆盖范围小、发射功率低的特点，适用于提供高速率的数据传输服务。图1中的终端设备也可以称为用户设备(user equipment,UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。终端设备可以是WLAN中的站点(station,ST)，可以是蜂窝电话、无绳电话、SIP电话、无线本地环路(wireless local loop,WLL)站、个人数字处理(personal digital assistant,PDA)设备、具有无线通信功能的手持设备、中继设备，计算设备或耦合到无线调制解调器的其它处理设备、车载设备、可穿戴设备以及下一代通信系统，例如，5G网络中的终端设备或者未来演进的公共陆地移动网络(public land mobile network,PLMN)网络中的终端设备等。作为示例而非限定，在本申请实施例中，该终端设备还可以是可穿戴设备。可穿戴设备也可以称为穿戴式智能设备，是应用穿戴式技术对日常穿戴进行智能化设计、开发出可以穿戴的设备的总称，如眼镜、手套、手表、服饰及鞋等。可穿戴设备即直接穿在身上，或是整合到用户的衣服或配件的一种便携式设备。可穿戴设备不仅仅是一种硬件设备，更是通过软件支持以及数据交互、云端交互来实现强大的功能。广义穿戴式智能设备包括功能全、尺寸大、可不依赖智能手机实现完整或者部分的功能，例如：智能手表或智能眼镜等，以及只专注于某一类应用功能，需要和其它设备如智能手机配合使用，如各类进行体征监测的智能手环、智能首饰等。
可选地，在5G系统中，一个RAN设备(如gNB)按协议栈还可进一步地划分为集中单元(central unit,CU)和分布式单元(distributed unit,DU)，其中CU和DU可以分别部署在不同的物理设备上。CU负责RRC层、SDAP层以及PDCP层的操作，DU负责RLC层、MAC层以及PHY层的操作。图2(a)示出了一种划分为CU和DU的gNB的架构。其中，一个gNB可包含一个CU以及一个或多个DU，该一个或多个DU由该一个CU所控制。一个DU与CU通过控制面接口(如F1-C)连接，用于传输控制面数据；一个DU与CU通过用户面接口(如F1-U)连接，用于传输用户面数据。进一步地，CU还可划分为控制面的集中单元(即集中单元控制面CU-CP网元)和用户面的集中单元(即集中单元用户面CU-UP网元)，其中CU-CP和CU-UP也可以分别部署在不同的物理设备上，CU-CP负责RRC层和PDCP层控制面的处理，CU-UP负责SDAP层和PDCP层用户面的处理。图2(b)示出了一种划分为CU-CP、CU-UP和DU的gNB的架构。其中，一个gNB可包含一个CU-CP、一个或多个CU-UP以及一个或多个DU。一个CP-UP仅与一个CU-CP通过控制面接口(如E1)连接，用于传输控制面数据；一个DU仅与一个CU-CP通过控制面接口(如F1-C)连接，用于传输控制面数据；在CU-CP的控制下，一个DU可以与一个或多个CU-UP连接，一个CU-UP也可以与一个或多个DU连接，CU-UP与DU之间通过用户面接口(如F1-U)连接，用于传输用户面数据。值得说明的是，为了保持网络的弹性，一个DU或一个CU-UP也可以和多个CU-CP连接。此时，多个CU-CP彼此作为备份；在实际应用中，同一时刻只有一个CU-CP在运行。应理解，对于划分为CU和DU的RAN设备架构而言，上述RAN设备划分为CU和DU所根据的协议栈划分方式仅是示例性的，RAN设备也可以根据其他划分方式划分CU和DU，例如可以由CU负责RRC层、SDAP层、PDCP层以及RLC层的操作，由DU负责MAC层以及PHY层的操作；或者由CU负责RRC层以及SDAP层的操作，由DU负责PDCP层、RLC层、MAC层以及PHY层的操作等；类似地，CU中的CU-CP和CU-UP之间的协议栈划分方式也是可变的；申请对此不作具体限定。
为了便于理解，首先介绍几个本申请实施例中涉及的概念。应理解的是，以下的概念解释可能会因为本申请实施例的具体情况有所限制，但并不代表本申请仅能局限于该具体情况，以下概念的解释伴随不同实施例的具体情况可能也会存在差异。
系统信息(system information,SI)：SI一般包含主信息块(master information block,MIB)和多个系统信息块(system information block,SIB)。其中，MIB和各个SIB可以使用相同或不同的周期进行广播。MIB在物理广播信道(physical broadcast channel,PBCH)发送，各个SIB可以在下行共享信道发送。多个SIB分为SIB1和其他SIB，其他SIB包含SIB2、SIB3、SIB4等。不同的SIB包含的内容不同并具有不同的功能，例如SIB1包含初始接入系统所需要的信息，SIB2包含小区重选的信息，SIB3包含服务频率信息以及同频小区重选相关的邻区信息，SIB4包含其他频率信息以及异频小区重选相关的邻区信息等。
基础载波(base component carrier,BCC)小区：BCC小区是指周期性发送公共广播信令的小区，该公共广播信令包含同步信号和SI，该公共广播信令还可以包含寻呼信令等。具体地，控制该BCC小区的RAN设备在其该BCC小区的载波对应的资源上周期性发送公共广播信令。为了方便描述，在下文中，控制一个小区的RAN设备广播信号/消息也称为该小区广播信号/消息。由于BCC小区广播了SI，BCC小区允许终端设备的接入。终端设备通过读取SI获取接入BCC小区的必要信息，从而可以接入BCC小区。
数据载波(data component carrier,DCC)小区：DCC小区是指在其载波对应的资源上不发送至少部分公共广播信令的小区，例如不发送SI或发送部分SI。DCC小区还可以不发送寻呼信令等。由于减少了公共广播信令的发送，可以减少DCC小区的发射时间和/或发射功率，从而达到节能的目的。由于DCC小区不发送获取接入DCC小区的必要SI，DCC小区不允许新的终端设备的接入，但可以为已接入的终端设备提供数据传输。需要说明的是，已接入的终端设备可以是通过其他途径获取接入DCC小区的必要SI，或在DCC小区从BCC小区转换成DCC小区之前接入该小区。进一步地，DCC小区还可以不发送全部公共广播信令，即不发送同步信号和SI，从而更进一步节能。
同步信号块(synchronization signal block,SSB)：SSB包含主同步信号(primary synchronization signal,PSS)、辅同步信号(secondary synchronization signal,SSS)以及物理广播信道(physical broadcast channel,PBCH)。其中，SSB在时域上占用4个符号、在频域上占用240个子载波，并可使用5ms到160ms的周期进行广播。PSS在SSB中的第一个OFDM符号传输并占用127个子载波；SSS在SSB的第三个OFDM符号传输并也占用127个子载波；PBCH在SSB的第二个OFDM和第四个OFDM符号传输并占用240个子载波；此外，PBCH也使用SSS两侧的48个子载波传输。值得说明的是，在PBCH传输的资源中还包含了用于解调PBCH的解调参考信号(demodulation reference signal,DMRS)。另外，对于多波束的场景，每个波束可对应有一个SSB，不同波束的SSB可以通过时分复用的方式使用波束扫描进行SSB的发送。多个波束的SSB的合集称为SS突发集(SS burst set)。此时，上述SSB的广播周期是指一个波束的SSB的广播周期，一个SS突发集总是在5ms范围内发送。
对于NR的初始接入，UE进入移动网络的覆盖区域，首先会进行基于SSB的小区搜索，通过PSS和SSS检测获取物理层小区标识(physical cell identify,PCI)、频率同步和下行时间同步；通过解码PBCH能够获得MIB，包含终端为获取网络广播的剩余系统信息所需要的少量信息，诸如系统帧号、SSB时间索引、DMRS位置、SIB1配置等。其中，MIB配置提供UE所需检测SIB1所需的搜索空间、控制资源集(control resource sets,CORESET)和其他物理下行控制信道(physical downlink control channel,PDCCH)相关的参数等。SIB1也称为剩余最小系统信息(remaining minimum system information,RMSI)，RMSI包含UE接入网络所需要知道的系统信息，如UE随机接入所必须知道的信息，即接入小区的必要SI。为方便描述，在下文中SIB1等同于RMSI，两者可互换使用。NR小区通常会周期性广播RMSI，以使得UE能接入网络。SIB中除了SIB1之外的其他系统信息(other system information,OSI)，包含UE在接入系统之前所不需要知道的系统信息。这些OSI可以周期性广播，也可以按需(on demand)传输，即在UE请求时才发送。需要说明的是，对于不发送RMSI的DCC小区，其MIB可不包含SIB1配置。
图3示出了在NR中BCC小区和DCC小区的物理帧信息发送的差异示意图。其中，图3(a)示出BCC 小区的物理帧发送的信息，该物理帧可对应为一个子帧或一个时隙，并可以周期性地发送。在该物理帧中，BCC小区广播公共广播信令SSB、RMSI和OSI，可以为终端设备提供接入。图3(b)至图3(d)为三种类型的DCC小区，其中图3(b)对应的DCC1小区广播部分公共广播信令如SSB，但不广播RMSI和OSI；图3(c)对应的DCC2小区广播SSB和OSI，但不广播RMSI；图3(d)对应的DCC3小区不广播公共广播信令。值得说明的是，图3(a)至图3(d)中各种公共广播信令的发送是示意性的，并不详细描述各小区发送这些公共广播信令所使用的具体的物理资源；图3(a)至图3(c)中物理帧除了公共广播信令所占用的资源外，其他未标注的物理帧资源可用于数据传输和其他控制信令的传输。在实际通信系统中，一种可能的场景是BCC小区作为异构网络的覆盖层，主要提供控制面数据传输和小容量的用户面数据传输；DCC小区作为异构网络的容量层，其覆盖范围小于BCC小区，容量层叠加在覆盖层之上，主要提供大容量的用户面数据传输。在这种情况下，DCC小区可以提供数据面传输，由于不广播RMSI，减少周期的公共广播信令以实现节能。另一种可能的场景是BCC小区和DCC小区共同为终端设备提供数据传输，实现终端设备与网络的双连接，如图1中终端设备120同时与RAN设备140和RAN设备142进行连接。在这种情况下，DCC小区可以作为BCC小区的辅小区(组)协同为终端设备提供数据传输，DCC小区本身不接纳终端设备的接入，减少控制面信令以实现节能。BCC小区还可能存在其他的应用场景，本申请在此不作具体限定。
发明人发现，由于DCC小区没有发送RMSI，使得终端设备无法接入DCC小区，当有UE需要接入网络时，现有技术无法利用DCC小区接入UE，从而提高网络的容量和提升UE服务质量。为此，本申请实施例提供了一种传递系统信息的技术方案。进一步地，本申请实施例的技术方案还应用于具有CU和DU的RAN设备架构，其中CU还可包括CU-CP和CU-UP分离的情况。
本文具体提供了如下几种实施例，下面结合图4至图9，以具体的方法实施例对本申请的技术方案进行详细说明。下面这几个具体的实施例可以相互结合，对于相同或相似的概念或过程可能在某些实施例不再赘述。需要说明的是，图4至图9是本申请的方法实施例的示意性流程图，示出了该方法的详细的通信步骤或操作，但这些步骤或操作仅是示例，本申请实施例还可以执行其它操作或者图4至图9中的各种操作的变形。此外，图4至图9中的各个步骤可以分别按照与图4至图9所呈现的不同的顺序来执行，并且有可能并非要执行图4至图9中的全部操作。
在一种可能的实施方式中，处于RRC空闲态的终端设备尝试接入一个BCC小区时，该BCC小区将DCC小区的SI发送给该终端设备。这种实施方式可能应用于终端设备期望接入DCC小区，但是由于DCC小区不发送初始接入该DCC小区所需的系统信息，终端设备只能尝试接入BCC小区，并在接入BCC小区时告知网络其期望接入DCC小区。
图4为本申请实施例提供的一种终端设备随机接入RAN设备并建立无线资源控制(radio resource control,RRC)连接的方法流程示意图。该方法400可应用于终端设备随机接入LTE的eNB，也可以应用于终端设备随机接入eLTE的ng-eNB或NR的gNB等。图4所述流程包含如下步骤：
S401、终端设备向RAN设备发送随机接入前导。
相应地，RAN设备接收来自终端设备的随机接入前导。
在该步骤中，终端设备向RAN设备发送随机接入前导以尝试接入该RAN设备控制的一个小区。需要说明的是，该RAN设备控制一个或多个BCC小区，终端设备尝试接入的小区为BCC小区。
通常地，终端设备在随机接入前导集合中随机地选择一个随机接入前导，在预先配置的物理随机接入信道(physical random access channel,PRACH)资源池中选择合适的PRACH资源向RAN设备发送该随机接入前导。为了方便描述，在下文中，终端设备向控制BCC小区的RAN设备发送信号或信息，也可称为终端设备向BCC小区发送信号或信息。
需要说明的是，终端设备在执行步骤S401之前处于RRC空闲态，当终端设备收到网络侧寻呼或自身 有业务发起时，执行步骤S401接入小区并建立RRC连接。
S402、RAN设备向终端设备发送随机接入响应。
相应地，终端设备接收来自RAN设备的随机接入响应。
RAN设备收到终端设备发送的随机接入前导后，根据接收到该随机接入前导的时间计算终端设备发送的时间提前量(timing advance,TA)，并将该TA以及分配给终端设备发送RRC请求的上行资源授权通过随机接入响应发送给UE。为了方便描述，在下文中，控制BCC小区的RAN设备向终端设备发送信号或信息，也可称为BCC小区向终端设备发送信号或信息。
S403、终端设备向RAN设备发送RRC请求消息。
相应地，RAN设备接收来自终端设备的RRC请求消息。
RRC请求消息用于终端设备请求与RAN设备建立RRC连接。其中，RRC请求消息包含第一信息，第一信息用于指示终端设备期望接入DCC小区。可选地，第一信息可以使用一比特信息元素来表示终端设备是否期望接入DCC小区，如该比特取值为1时表示终端设备期望接入DCC小区，或该比特取值为0时表示终端设备期望接入DCC小区。
可选地，在该步骤中，终端设备在一个预先设定的数字范围内随机选择一个数字作为自身的标识(如ue-Identity)，根据RAN设备发送的TA向RAN设备发送RRC请求消息。
可选地，RRC请求消息是RRC连接请求(RRCConnectionRequest)消息或RRC建立请求(RRCSetupRequest)消息。
S404、RAN设备向终端设备发送RRC拒绝消息。
相应地，终端设备接收来自RAN设备的RRC拒绝消息。
RRC拒绝消息用于RAN设备指示拒绝终端设备的RRC请求。其中，RRC拒绝消息包含第二信息，第二信息包含DCC小区的小区标识以及该DCC小区的部分SI。该DCC小区的部分SI包含该DCC小区的RMSI，还可以包含该DCC小区的OSI。需要说明的是，第二信息可以包含一个或多个DCC小区中各个DCC小区的小区标识以及各个DCC小区的部分SI。为了方便描述，在下文中，DCC小区的部分SI包含该DCC小区的RMSI，进一步地，还可包含该DCC小区的OSI。
可选地，RRC拒绝消息是RRC拒绝(RRCReject)消息或RRC连接拒绝(RRCConnectionReject)消息。
需要说明的是，上述步骤S401至S404中，终端设备执行的是基于竞争的随机接入，即如果多个终端设备在步骤S401中选择了相同的随机接入前导并且在相同的PRACH资源上发送该随机接入前导，则这些终端设备的随机接入可能发生冲突并需要进行竞争解决。竞争成功的终端设备正确接收步骤S404的消息，竞争失败的终端设备不能解码步骤S404的消息并需要再次发起随机接入。上述步骤S401和S402是可选的，用于在终端设备随机接入RAN设备的过程中。如果终端设备通过其他方式接入RAN设备并建立RRC连接，则可不执行上述步骤S401和S402。
在另一种实施方式中，在步骤S403中，RRC请求消息包含的第一信息用于指示一个或多个DCC小区。例如，第一信息可以包含一个或多个DCC小区的小区标识。在这种情况下，第一信息相当于指示终端设备期望接入的哪个(些)DCC小区。例如，在终端设备接入BCC小区前搜索到一个DCC小区，这样，终端设备可以在与BCC小区建立RRC连接时，在RRC请求消息中携带该DCC小区的小区标识，以指示终端设备期望接入该DCC小区。相应地，在步骤S404中，第二信息包含该一个或多个DCC小区中各个DCC小区的小区标识以及各个DCC小区的部分SI。可选地，第二信息仅包含该一个或多个DCC小区中各个DCC小区的部分SI。例如，第一信息中包含一个DCC小区的小区标识，则第二信息不包含该DCC小区的小区标识；或者第一信息中包含多个DCC小区的小区标识，第二信息包含的该多个DCC小区中各个 DCC小区的部分SI的排列顺序对应于第一信息中多个DCC小区的各个DCC小区的小区标识的排列顺序时，第二信息也可以不包含该多个DCC小区的小区标识。需要说明的是，在步骤S404中，第二信息中包含的一个或多个DCC小区的信息可以是第一信息中包含的一个或多个DCC小区的信息的部分或全部；此外，第二信息中包含的一个或多个DCC小区的信息也可以不对应于第一信息中指示的一个或多个DCC小区。示例性地，第一信息包含第二小区A的标识和第二小区B的标识；第二信息中包含的第二小区的信息可以包含第二小区A或第二小区B的信息，也可以包含第二小区A和第二小区B的信息，还可以包含第二小区C的信息。
对于RAN设备是CU-DU分离架构的情况，上述步骤S401至S404中部分消息是终端设备和DU之间的交互，部分消息是终端设备和CU之间的交互。具体地，在步骤S401中，终端设备向尝试接入的DU发送随机接入前导。在步骤S402中，DU向终端设备发送随机接入响应。在步骤S403中，终端设备通过该DU向该DU连接的CU发送RRC请求。其中，终端设备通过空口向DU发送RRC请求，再由DU通过F1-C接口将该RRC请求发送给CU。在步骤S404中，CU通过DU向终端设备发送RRC拒绝。其中，CU通过F1-C接口向DU发送RRC拒绝，再由DU通过空口将该RRC拒绝发送给终端设备。在CU进一步划分为CU-CP和CU-UP的情况下，步骤S403和S404是终端设备和该CU的CU-CP之间的交互。
通过本申请实施例上述步骤，实现处于UE在接入RAN时获取DCC小区的部分SI，从而使能UE接入DCC小区。
可选地，终端设备在步骤S404接收到第二信息后，可执行小区重选流程并选择合适的小区进行接入，该合适的小区可以是BCC小区也可以是DCC小区。示例性地，eNB控制的BCC小区广播小区参考信号(cell-specific reference signal,CRS)，gNB控制的DCC小区广播SSB。若终端设备检测到一个DCC小区的信号强度高于该终端设备尝试接入的BCC小区的CRS强度，则终端设备可尝试接入该DCC小区。终端设备选择合适的小区的准则可以是根据各个小区的参考信号的强度来选择，也可以是其他的准则，例如终端设备优先选择接入DCC小区等，本申请对此不作具体限定。
图5为本申请实施例提供的另一种终端设备随机接入RAN设备并建立RRC连接的方法流程示意图。该方法500可应用于终端设备随机接入LTE的eNB，也可以应用于终端设备随机接入eLTE的ng-eNB或NR的gNB等。图5所述流程包含如下步骤：
S501、终端设备向RAN设备发送随机接入前导。
相应地，RAN设备接收来自终端设备的随机接入前导。
S502、RAN设备向终端设备发送随机接入响应。
相应地，终端设备接收来自RAN设备的随机接入响应。
上述步骤S501和S502与前述实施例步骤S401和S402类似，在此不再赘述。需要说明的是，步骤S501和S502也是可选的。
S503、终端设备向RAN设备发送RRC请求消息。
相应地，RAN设备接收来自终端设备的RRC请求消息。
RRC请求消息用于终端设备请求与RAN设备建立RRC连接。其中，RRC请求消息包含第一标识，第一标识包含终端设备的至少部分标识，例如第一标识包含5G核心网为终端设备提供的临时终端设备标识中的至少部分标识。值得说明的是，如果终端设备在步骤S501之前已向5G核心网进行了注册，则5G核心网为该终端设备在所注册的跟踪区域分配一个临时终端设备标识，如5G系统架构演进临时移动台标识(5G S-Temporary Mobile Subscription Identifier,5G-S-TMSI)。在该步骤中，第一标识包含至少部分5G-S-TMSI，即第一标识可以包含部分或全部的5G-S-TMSI，还可以包含其他信息。
可选地，RRC请求消息可以是RRC连接请求(RRCConnectionRequest)消息或RRC建立请求 (RRCSetupRequest)消息。
S504、RAN设备向终端设备发送RRC拒绝消息。
相应地，终端设备接收来自RAN设备的RRC拒绝消息。
上述步骤S504与前述实施例步骤S404类似，在此不再赘述。
对于RAN设备是CU-DU分离架构的情况，与图4实施例类似，步骤S501和S502是终端设备和DU之间的交互；步骤S503和S504是终端设备和CU之间的交互。在CU进一步划分为CU-CP和CU-UP的情况下，步骤S503和S504是终端设备和该CU的CU-CP之间的交互。
通过本申请实施例上述步骤，实现终端设备在接入RAN时获取DCC小区的部分SI，从而使能终端设备接入DCC小区。由于终端设备已经在5G核心网注册过，在RRC请求中只需要携带终端设备的第一标识，从而节省了空口信令开销。
可选地，终端设备在步骤S504接收到第二信息后，可执行小区重选流程并选择合适的小区进行接入，该合适的小区可以是BCC小区也可以是DCC小区。示例性地，eNB控制的BCC小区广播CRS，gNB控制的DCC小区广播SSB。若终端设备检测到一个DCC小区的信号强度高于该UE尝试接入的BCC小区的CRS强度，则终端设备可尝试接入该DCC小区。终端设备选择合适的小区的准则可以是根据各个小区的参考信号的强度来选择，也可以是其他的准则，例如终端设备优先选择接入DCC小区等，本申请对此不作具体限定。
在图4和图5所示实施例中，终端设备在接入BCC小区建立RRC连接的过程中获取DCC小区的部分SI，以便能接入DCC小区。在另一种可能的实施方式中，当终端设备处于RRC连接态时，即终端设备已经与BCC小区建立了RRC连接，在这种情况下，可以由终端设备向BCC小区请求获取DCC小区的部分SI，或者由BCC小区主动向终端设备发送DCC小区的部分SI。
图6为本申请实施例提供的一种终端设备请求RAN设备发送DCC小区的部分SI的方法流程示意图。示例性地，处于RRC连接态的终端设备由于业务的服务质量(quality of service,QoS)要求，期望从BCC小区的RRC连接切换到DCC小区的RRC连接，或增加DCC小区的RRC连接。在这种情况下，终端设备可请求BCC小区发送DCC小区的部分SI。该方法600可应用于终端设备与LTE的eNB、eLTE的ng-eNB或NR的gNB之间的交互。图6所述流程包含如下步骤：
S601、终端设备向RAN设备发送RRC重建立请求消息。
相应地，RAN设备接收来自终端设备的RRC重建立请求消息。
RRC重建立请求用于终端设备请求与RAN设备重建立RRC连接。其中，RRC重建立请求消息包含第一信息，该第一信息用于指示终端设备期望接入DCC小区。需要说明的是，终端设备在向RAN设备发送RRC重建立请求消息之前，终端设备与该RAN设备控制的BCC小区建立过RRC连接，并在该步骤中请求与该BCC小区重建立RRC连接。可选地，第一信息可以使用一比特信息元素来表示终端设备是否期望接入DCC小区，如该比特取值为1时表示终端设备期望接入DCC小区，或该比特取值为0时表示终端设备期望接入DCC小区。
可选地，RRC重建立请求消息是RRC重建立请求(RRCReestablishmentRequest)消息或RRC连接重建立请求(RRCConnectionReestablishmentRequest)消息。
S602、RAN设备向终端设备发送RRC重建立响应消息。
相应地，终端设备接收来自RAN设备的RRC重建立响应消息。
作为RRC重建立请求的响应，RRC重建立响应消息包含第二信息，第二信息包含DCC小区的小区标识以及该DCC小区的部分SI。需要说明的是，第二信息可以包含一个或多个DCC小区中各个DCC小区的小区标识和部分SI。
可选地，RRC重建立响应消息是RRC重建立(RRCReestablishment)消息、RRC建立(RRCSetup)消息、RRC连接重建立(RRCConnectionReestablishment)消息、或RRC连接重建立拒绝(RRCConnectionReestablishmentReject)消息。
在另一种实现方式中，在步骤S601中，RRC重建立请求消息包含的第一信息用于指示一个或多个DCC小区。例如，第一信息可以包含一个或多个DCC小区的小区标识。在这种情况下，第一信息相当于指示终端设备期望接入的哪个(些)DCC小区。例如，在终端设备在RRC重建立之前搜索或检测到一个DCC小区，这样，终端设备可以在与BCC小区进行RRC重建立时，在RRC重建立请求消息中携带该DCC小区的小区标识，以指示终端设备期望接入该DCC小区。相应地，在步骤S602中，第二信息包含该一个或多个DCC小区中各个DCC小区的小区标识以及各个DCC小区的部分SI。可选地，第二信息仅包含该一个或多个DCC小区中各个DCC小区的部分SI。例如，第一信息中包含一个DCC小区的小区标识，则第二信息不包含该DCC小区的小区标识；或者第一信息中包含多个DCC小区的小区标识，第二信息包含的该多个DCC小区中各个DCC小区的部分SI的排列顺序对应于第一信息中多个DCC小区的各个DCC小区的小区标识的排列顺序时，第二信息也可以不包含该多个DCC小区的小区标识。需要说明的是，在步骤S602中，第二信息中包含的一个或多个DCC小区的信息可以是第一信息中包含的一个或多个DCC小区的信息的部分或全部；此外，第二信息中包含的一个或多个DCC小区的信息也可以不对应于第一信息中指示的一个或多个DCC小区。示例性地，第一信息包含第二小区A的标识和第二小区B的标识；第二信息中包含的第二小区的信息可以包含第二小区A或第二小区B的信息，也可以包含第二小区A和第二小区B的信息，还可以包含第二小区C的信息。
对于RAN设备是CU-DU分离架构的情况，步骤S601和S602是终端设备和CU之间的交互，该CU和已经与终端设备建立RRC连接的DU相连接。具体地，在步骤S601中，终端设备通过DU向CU发送RRC重建立请求。其中，终端设备通过空口向DU发送RRC重建立请求，再由DU通过F1-C接口将该RRC重建立请求发送给CU。在步骤S602中，CU通过DU向终端设备发送RRC重建立响应。其中，CU通过F1-C接口向DU发送RRC重建立响应，再由DU通过空口将RRC重建立响应发送给终端设备。在CU进一步划分为CU-CP和CU-UP的情况下，步骤S601和S602是终端设备和该CU的CU-CP之间的交互。
通过本申请实施例上述步骤，实现处于RRC连接态的终端设备主动请求获取DCC小区的部分SI，从而使能终端设备接入DCC小区。
图7为本申请实施例提供的一种RAN设备向终端设备主动发送DCC小区的部分SI的方法流程示意图。示例性地，BCC小区由于负载过高，并结合终端设备的业务QoS需要，希望将终端设备切换到DCC小区，或者希望增加DCC小区为终端设备提供服务。在这种情况下，BCC小区主动向处于RRC连接态的终端设备发送DCC小区的部分SI。该方法700可应用于终端设备与LTE的eNB、eLTE的ng-eNB或NR的gNB之间的交互。图7所述流程包含如下步骤：
S701、RAN设备向终端设备发送RRC重配置消息。
相应地，终端设备接收来自RAN设备的RRC重配置消息。
RRC重配置用于修改终端设备的RRC连接，如建立/修改/释放无线承载、建立/修改/释放测量、或增加/修改/删除辅小区等。其中，RRC重配置消息包含第二信息，第二信息包含DCC小区的小区标识以及该DCC小区的部分SI。需要说明的是，第二信息可以包含一个或多个DCC小区中各个DCC小区的小区标识以及各个DCC小区的部分SI。在RAN设备向终端设备发送RRC重配置消息之前，终端设备与该RAN设备控制的BCC小区建立了RRC连接，该BCC小区在该步骤中向终端设备发起RRC重配置。
可选地，RRC重配置消息是RRC重建立(RRCReconfiguration)消息或RRC连接重配置请求 (RRCConnectionReconfiguration)消息。
S702、终端设备向RAN设备发送RRC重配置响应消息。
相应地，RAN设备接收来自终端设备的RRC重配置响应消息。
终端设备通过对RRC重配置消息的响应来确认是否成功接收RRC重配置消息。可选地，该响应包含在RRC重配置完成(RRCReconfigurationComplete)消息中、也可以包含在RRC连接重配置完成(RRCConnectionReconfigurationComplete)消息中、还可以包含在RRC连接重建立(RRC connection re-establishment)消息中。
对于RAN设备是CU-DU分离架构的情况，与图6实施例类似，步骤S701和S702是终端设备和CU之间的交互，该CU和已经与终端设备建立RRC连接的DU相连接。在CU进一步划分为CU-CP和CU-UP的情况下，步骤S701和S702是终端设备和该CU的CU-CP之间的交互。
通过本申请实施例上述步骤，实现BCC小区主动向处于RRC连接态的终端设备发送DCC小区的SI，从而使能终端设备接入DCC小区。
对于BCC主动向处于RRC连接态的终端设备发送DCC小区的部分SI，还可以采用另一种实施方式，即BCC小区向终端设备发送RRC释放消息。其中，RRC释放消息包含上述第二信息。可选地，RRC释放消息是RRC释放(RRCRelease)消息或RRC连接释放(RRCConnectionRelease)消息。
在上述实施例中，终端设备和BCC小区通过RRC信令的交互，使得终端设备能获取DCC小区的部分SI，以使能终端设备接入DCC小区。在又一种可能的实施方式中，BCC小区可以将DCC小区的部分SI通过广播的方式发送。具体地，BCC小区将DCC小区的小区标识以及该DCC小区的部分SI(即上述第二信息)包含在该BCC小区的SI中进行广播；或者，BCC小区通过其他广播信道对第二信息进行广播。本申请实施例对BCC小区如何将第二信息进行广播不作具体限定。需要说明的是，BCC小区可以广播一个或多个DCC小区各自的小区标识以及各自的部分SI。示例性地，当BCC小区通过自身的SI广播DCC小区的部分SI时，BCC小区需要修改自身的SI，并通知终端设备去读取修改后的SI。其中，BCC小区的SI中包含了SI修改周期的配置。可选地，BCC小区在PDCCH中指示终端设备该BCC小区的SI的修改。终端设备在收到该指示后在下一个SI修改周期去读取修改后的SI，即包含了第二信息的BCC小区的SI。
在再一种可能的实施方式中，终端设备在随机接入BCC小区时，通过发送特定的随机接入前导以获取上述第二信息。特定的随机接入前导是指用于请求SI的前导，该特定的随机接入前导可用于请求DCC小区的SI，还可以用于请求BCC小区的SI。在该实施方式中，可通过标准协议、终端设备签约信息或其他方式预先配置终端设备请求获取BCC和/或DCC小区的SI所使用的第一随机接入前导集合。可选地，终端设备在特定的PRACH资源上发送特定的随机接入前导，该特定的PRACH资源也是预先配置的。终端设备和RAN设备预先获取第一随机接入前导集合，还可进一步预先获取终端设备发送特定的随机接入前导的PRACH资源池。在终端设备随机接入BCC小区时，终端设备在第一随机接入前导集合中选择一个特定的随机接入前导并在特定的PRACH资源上发送给RAN设备。该选择可以是终端设备在第一随机接入前导集合中随机选择一个，也可以是RAN设备预先配置给终端设备的，还可以是终端设备使用其他准则选择的，本申请对此不作具体限定。可选地，RAN设备正确接收该特定的随机接入前导后获知终端设备请求获取BCC和/或DCC小区的SI。图8为本申请实施例提供的终端设备向RAN设备请求DCC小区的SI的方法流程示意图。该方法800流程包含如下步骤：
S801、终端设备向RAN设备发送SI请求。
相应地，RAN设备接收来自终端设备的SI请求。
在该步骤中，终端设备选择特定的随机接入前导，并向RAN设备发送该特定的随机接入前导。
需要说明的是，上述步骤S801与前述步骤S401类似，主要区别在于在该步骤中终端设备向RAN设 备发送的特定的随机接入前导是用于请求SI。通常地，也可称为终端设备向RAN设备发送SI请求，用于请求DCC小区的SI。具体地，可用于请求DCC小区的RMSI，进一步地，还可用于请求DCC小区的OSI。可选地，该SI请求也可请求RAN设备控制的BCC小区的SI，例如，BCC小区的SI中的除了SIB1以外的其他SIB。
S802、RAN设备向终端设备发送SI请求确认。
相应地，终端设备接收来自RAN设备的SI请求确认。
在该步骤中，RAN设备向终端设备发送随机接入响应，该随机接入响应用于指示对SI请求的确认(acknowledgement for SI request)。
可选地，RAN设备在随机接入响应中针对该终端设备的MAC层子PDU中只包含该UE的随机接入前导标识(random access preamble identifier,RAPID)，以指示对该终端设备的SI请求的确认。
S803、RAN设备向终端设备发送SI。
相应地，终端设备接收来自RAN设备的SI。
在该步骤中，RAN设备在调度的资源上向UE发送SI。该SI至少包含一个或多个DCC小区的各个DCC小区的小区标识以及各个DCC小区的部分SI。可选地，该SI还可包含RAN设备控制的BCC小区的SI中除了SIB1以外的其他SIB。
对于RAN设备是CU-DU分离架构的情况，步骤S801至S803中部分消息是终端设备和DU之间的交互，部分消息是终端设备和CU之间的交互。具体地，在步骤S801中，终端设备向DU发送系统信息请求。在步骤S802中，DU向终端设备发送系统信息请求确认。如果系统信息保存在该DU相连的CU，则在步骤S803中，该DU相连的CU通过该DU向终端设备发送系统信息；其中，CU通过F1-C接口向DU发送系统信息，再由DU通过空口将该系统信息发送给终端设备。如果在CU进一步划分为CU-CP和CU-UP的情况下，步骤S803是该CU的CU-CP通过DU向终端设备发送系统信息。如果系统信息保存在该DU，则在步骤S803中，该DU向终端设备发送系统该信息。
通过本申请实施例上述步骤，实现终端设备快速获取DCC小区的部分SI，从而使能终端设备接入DCC小区。终端设备在建立RRC连接之前就可获取DCC小区的部分SI，从而缩短了终端设备获取DCC小区部分SI的时间，有利于缩短终端设备接入网络的时间。
上述多个实施例描述了终端设备如何从BCC小区获取DCC小区的部分SI的多种方式。需要说明的是，控制BCC小区的RAN设备在向UE发送DCC小区的部分SI之前，该RAN设备已经获取了一个或多个DCC小区的部分SI。该一个或多个DCC小区可以与该BCC小区具有邻区关系。DCC小区的覆盖可以和BCC小区的覆盖部分重叠或全部重叠。该RAN设备获取DCC小区的部分SI的方式可以有多种，例如，该RAN设备可以通过操作、管理和维护系统(operation,administration and maintenance,OAM)获取DCC小区的部分SI并进行保存；或者，该RAN设备控制的BCC小区和相邻的DCC小区会建立小区间接口(如X2接口或Xn接口)并在运行过程中更新该接口，该RAN设备可以通过小区间接口获取DCC小区的部分SI并进行保存；该RAN设备还可以通过其他方式获取DCC小区的部分SI并进行保存，本申请对此不作具体限定。
图9为本申请实施例提供的一种控制DCC小区的第一RAN设备与控制BCC小区的第二RAN设备之间的信息交互方法流程示意图。该方法900流程包含如下步骤：
S901、第一RAN设备向第二RAN设备发送第三信息，第三信息用于指示第一RAN设备所控制的一个或多个小区为DCC小区。
相应地，第二RAN设备接收来自第一RAN设备的第三信息。
在该步骤中，控制DCC小区的第一RAN设备向控制BCC小区的第二RAN设备指示该小区为DCC 小区。通常地，该DCC小区和该BCC小区具有邻区关系。该DCC小区可以是图3(b)至图3(d)所示的任意一种DCC小区。
在一种可能的实现方式中，第三信息可以包含至少一个DCC小区的小区标识。这样，第二RAN设备收到第三信息后就知道第一RAN设备控制的哪个(些)小区是DCC小区。第三信息还可以采用其他能识别DCC小区身份的信息来指示，本申请对此不作具体限定。进一步地，第三信息还可以包含指示该DCC小区为何种类型的DCC小区。例如该DCC小区为广播SSB但不广播RMSI和OSI的DCC小区(如图3(b))，或该DCC小区为广播SSB和OSI但不广播RMSI的DCC小区(如图3(c))，或该DCC小区为不广播公共广播信令的DCC小区(如图3(d))等。可选地，对于一个DCC小区，第三信息包含两比特的信息元素来指示该DCC小区的类型。
在另一种可能的实现方式中，第三信息可以携带在现有的RAN设备之间交互的带有小区标识的消息中。示例性地，在现有的第一RAN设备向第二RAN设备发送的消息中包含了第一RAN设备控制的至少一个小区的小区标识。在这种情况下，如果一个小区是DCC小区，可在现有消息中对应于该小区的小区标识增加一个信息元素来表示第三信息。具体地，第三信息可以是一比特信息元素，如该比特取值为1时表示该小区是DCC小区，或者该比特取值为0时表示该小区是DCC小区；进一步地，第三信息还可以包含指示该DCC小区为何种类型的DCC小区。
第三信息可以是在第一RAN设备与第二RAN设备建立RAN侧接口时传递，也可以在第一RAN设备与第二RAN设备的接口信息更新时传递。可选地，第三信息包含在Xn建立请求(Xn setup request)消息中，也可以包含在NG-RAN节点配置更新(NG-RAN node configuration update)消息中。
S902、第二RAN设备向第一RAN设备发送第三信息的响应。
相应地，第一RAN设备接收来自第二RAN设备的第三信息的响应。
第二RAN设备通过对第三信息的响应来确认是否成功接收第一RAN设备发送的第三信息。可选地，该响应可以包含在Xn建立响应(Xn setup response)消息中，也可以包含在NG-RAN节点配置更新确认(NG-RAN node configuration update acknowledge)消息中。
需要说明的是，步骤S902是可选的。
第二RAN设备可将正确接收的第三信息进行保存。
通过上述步骤S901和S902，BCC小区可以获知其周围有哪些DCC小区，进一步地，还可以获知是何种类型的DCC小区，为BCC小区向终端设备发送DCC小区的部分SI提供辅助信息。
S903、第一RAN设备向第二RAN设备发送第二信息。
相应地，第二RAN设备接收来自第一RAN设备的第二信息。
第二信息包含DCC小区的小区标识以及该DCC小区的部分SI。该DCC小区的部分SI包含该DCC小区的RMSI，还可以包含该DCC小区的OSI。需要说明的是，第二信息可以包含第一RAN设备控制的一个或多个DCC小区各自的小区标识以及各自的部分SI。
进一步地，在该步骤中第二信息包含的部分SI的信息与S901中的DCC小区类型相对应。例如，对于图3(b)类型的DCC小区，第二信息包含该DCC小区的RMSI，还可以进一步包含OSI；对于图3(c)类型的DCC小区，第二信息包含该DCC小区的RMSI。
第二信息可以在第一RAN设备与第二RAN设备建立RAN侧接口时传递，也可以在第一RAN设备与第二RAN设备的接口信息更新时传递。可选地，第二信息包含在Xn建立请求(Xn setup request)消息中，也可以包含在NG-RAN节点配置更新(NG-RAN node configuration update)消息中。
S904、第二RAN设备向第一RAN设备发送第二信息的响应。
相应地，第一RAN设备接收来自第二RAN设备的第二信息的响应。
第二RAN设备通过对第二信息的响应来确认是否成功接收第一RAN设备发送的第二信息。可选地，该响应可以包含在Xn建立响应(Xn setup response)消息中，也可以包含在NG-RAN节点配置更新确认(NG-RAN node configuration update acknowledge)消息中。
需要说明的是，步骤S904是可选的。
第二RAN设备可将正确接收的第二信息进行保存。
通过上述步骤S903和S904，BCC小区可以获知DCC小区的部分SI，使能BCC小区向终端设备发送DCC小区的部分SI。
需要说明的是，步骤S901和可选的S902为第一子流程，步骤S903和可选的S904为第二子流程。第一子流程和第二子流程可以各自独立执行。上述两个子流程还可以合并在一起，即第一RAN设备使用一条消息向第二RAN设备发送第三信息和第二信息，第二RAN设备使用另一条消息向第一RAN设备发送第三信息和第二信息的响应。
对于RAN设备是CU-DU分离架构的情况，在一种可能的实现方式中，第二信息和第三信息是保存在第一RAN设备中控制DCC小区的DU所连接的CU上，则在步骤S901中，第一RAN设备中控制DCC小区的DU所连接的CU通过Xn/X2接口向第二RAN设备中控制BCC小区的DU所连接的CU发送第三信息。可选地，该第二RAN设备的CU通过F1-C接口向该第二RAN设备的DU发送第三信息。在步骤S902中，第二RAN设备中控制BCC小区的DU所连接的CU通过Xn/X2接口向第一RAN设备中控制DCC小区的DU所连接的CU发送第三信息的响应。可选地，该第二RAN设备的DU通过F1-C接口向该第二RAN设备的CU发送第三信息的响应，再由该第二RAN设备的CU通过Xn/X2接口向该第一RAN设备的CU发送第三信息的响应。步骤S903中第二信息的传递过程与步骤S901中第三信息的传递过程类似，步骤S904中第二信息的响应的传递过程与步骤S902中第三信息的响应的传递过程类似，本申请在此不再赘述。在另一种可能的实现方式中，第二信息和第三信息是保存在第一RAN设备中控制DCC小区的DU上，则在步骤S901中，第一RAN设备中控制DCC小区的DU通过F1-C接口向该DU所连接的CU发送第三信息，再由该第一RAN设备的CU通过Xn/X2接口向第二RAN设备中控制BCC小区的DU所连接的CU发送第三信息。可选地，该第二RAN设备的CU通过F1-C接口向该第二RAN设备的DU发送第三信息。在步骤S902中，第二RAN设备中控制BCC小区的DU所连接的CU通过Xn/X2接口向第一RAN设备中控制DCC小区的DU所连接的CU发送第三信息的响应，再由该第一RAN设备的CU通过F1-C接口向该第一RAN设备的DU发送第三信息的响应。可选地，该第二RAN设备的DU通过F1-C接口向该第二RAN设备的CU发送第三信息的响应，再由该第二RAN设备的CU通过Xn/X2接口向该第一RAN设备的CU发送第三信息的响应，并由该第一RAN设备的CU通过Xn/X2接口向该第一RAN设备的DU发送第三信息的响应。步骤S903中第二信息的传递过程与步骤S901中第三信息的传递过程类似，步骤S904中第二信息的响应的传递过程与步骤S902中第三信息的响应的传递过程类似，本申请再次不再赘述。在CU进一步划分为CU-CP和CU-UP的情况下，步骤S901至S904中CU所执行的步骤由该CU的CU-CP执行。需要说明的是，在两个RAN设备其中一个是CU-CP架构的情况下，步骤S901至S904为一个RAN设备与另一个RAN设备的CU、或另一个RAN设备的CU-CP之间的交互，本申请对此不再赘述。
在上述多个实施例中，BCC小区获取DCC小区的部分SI，并可以通过多种方式将DCC小区的部分SI发送终端设备，进而使能终端设备接入DCC小区。在另一种实现方式中，BCC小区可以指示DCC小区转换成BCC小区，也可称为BCC小区激活DCC小区。例如，当接入BCC小区的终端设备数量很大，造成BCC小区负载过高，BCC小区可以指示其相邻的一个或多个DCC小区转换成BCC小区，从而使得网络中的部分终端设备可接入从DCC小区转换成的BCC小区，从而降低现有BCC小区的负载，也提升 终端设备的QoS。为此，控制该BCC小区的第二RAN设备可以向控制该DCC小区的第一RAN设备发送第四信息，第四信息用于指示该DCC小区转换为BCC小区，也可认为第四信息用于激活DCC小区。可选地，第四信息可以包含该DCC小区的小区标识。这样，第一RAN设备收到第四信息后就知道将其控制的哪个DCC小区转换为BCC小区。第四信息还可以采用其他能识别该DCC小区的信息来指示，本申请对此不作具体限定。可选地，BCC小区可以通过NG-RAN节点配置更新(NG-RAN node configuration update)消息向DCC小区传递第四信息。DCC小区还可以通过NG-RAN节点配置更新确认(NG-RAN node configuration update acknowledge)消息进行确认。对于RAN设备是CU-DU分离架构的情况，第四信息可以是第一RAN设备的DU和第二RAN设备的DU之间的交互，也可以是第一RAN设备的DU和第二RAN设备的CU之间的交互，还可以是第一RAN设备的CU和第二RAN设备的DU之间的交互，或第一RAN设备的CU和第二RAN设备的CU之间的交互。在CU进一步划分为CU-CP和CU-UP的情况下，则上述CU所执行的操作由该CU的CU-CP执行。在两个RAN设备其中一个是CU-CP架构的情况下，上述操作为一个RAN设备和另一个RAN设备的DU、或另一个RAN设备的CU、或另一个RAN设备的CU-CP之间的交互。通过该操作，BCC小区可以指示DCC小区转换为BCC小区，从而使能终端设备的接入，可以有利于减轻现有BCC小区负载，提升终端设备服务质量。
可选地，BCC小区还可以指示其他BCC小区转换成DCC小区，也可称为BCC小区去激活另一BCC小区。例如，当接入BCC小区的终端设备数量很少，网络负载较低时，BCC小区可以指示其相邻的一个或多个BCC小区转换成DCC小区，从而使得网络中的部分BCC小区实现节能，降低网络能耗。为此，控制该BCC小区的第二RAN设备可以向控制另一BCC小区的第一RAN设备发送第五信息，第五信息用于指示该BCC小区转换为DCC小区，也可认为第五信息用于去激活BCC小区。可选地，第五信息可以包含该BCC小区的小区标识。这样，第一RAN设备收到第五信息后就知道将其控制的哪个BCC小区转换为DCC小区。第五信息还可以采用其他能识别该BCC小区的信息来指示，本申请对此不作具体限定。可选地，BCC小区可以通过NG-RAN节点配置更新(NG-RAN node configuration update)消息向另一BCC小区传递第五信息。另一BCC小区还可以通过NG-RAN节点配置更新确认(NG-RAN node configuration update acknowledge)消息进行确认。对于RAN设备是CU-DU分离架构的情况，第五信息可以是第一RAN设备的DU和第二RAN设备的DU之间的交互，也可以是第一RAN设备的DU和第二RAN设备的CU之间的交互，还可以是第一RAN设备的CU和第二RAN设备的DU之间的交互，或第一RAN设备的CU和第二RAN设备的CU之间的交互。在CU进一步划分为CU-CP和CU-UP的情况下，则上述CU所执行的操作由该CU的CU-CP执行。在两个RAN设备其中一个是CU-CP架构的情况下，上述操作为一个RAN设备和另一个RAN设备的DU、或另一个RAN设备的CU、或另一个RAN设备的CU-CP之间的交互。通过该操作，BCC小区可以指示另一BCC小区转换为DCC小区，从而使得另一BCC小区实现节能，从而降低网络能耗。
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。该计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行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。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本专利申请的范围。
上文结合图4至图9详细描述了本申请的方法实施例，下文结合图10至图15，详细描述本申请的装置实施例。应理解，装置实施例与方法实施例相互对应，类似的描述可以参照方法实施例。值得注意的是，装置实施例可以与上述方法配合使用，也可以单独使用。
图10示出了本申请实施例的终端设备1000的示意性框图，该终端设备1000可以对应(例如，可以配置于或本身即为)上述方法400中描述的终端设备，或上述方法500中描述的终端设备，或上述方法600中描述的终端设备，或上述方法700中描述的终端设备，或上述方法800中描述的终端设备，或其他实施方式中描述的终端设备。该终端设备1000可以包括：处理器1001和收发器1002，处理器1001和收发器1002通信耦合。可选地，该终端设备1000还包括存储器1003，存储器1003与处理器1001通信耦合。可选地，处理器1001、存储器1003和收发器1002可以通信耦合，该存储器1003可以用于存储指令，该处理器1001用于执行该存储器1003存储的指令，以控制收发器1002接收和/或发送信息或信号。其中，处理器1001和收发器1002分别用于执行上述方法400中描述的终端设备，或上述方法500中描述的终端设备，或上述方法600中描述的终端设备，或上述方法700中描述的终端设备，或上述方法800中描述的终端设备，或其他实施方式中描述的终端设备，所执行的各动作或处理过程。这里，为了避免赘述，省略其详细说明。
图11示出了本申请实施例的终端设备1100的另一示意性框图，该终端设备1100可以对应(例如，可以配置于或本身即为)上述方法400中描述的终端设备，或上述方法500中描述的终端设备，或上述方法600中描述的终端设备，或上述方法700中描述的终端设备，或上述方法800中描述的终端设备，或其他实施方式中描述的终端设备。该终端设备1100可以包括：接收模块1101、处理模块1102和发送模块1103，处理模块1102分别和接收模块1101和发送模块1103通信耦合。终端设备1100可以采用图10所示的形式。其中，处理模块1102可以通过图10中的处理器1001来实现，接收模块1101和/或发送模块1103可以通过图10中的收发器1002来实现。终端设备1100可还可包括存储单元，用于存储处理模块1102要执行的程序或数据、或存储通过接收模块1101接收和/或通过发送模块1103发送的信息。该终端设备1100中各模块或单元分别用于执行上述方法400中描述的终端设备，或上述方法500中描述的终端设备，或上述方法600中描述的终端设备，或上述方法700中描述的终端设备，或上述方法800中描述的终端设备，或其他实施方式中描述的终端设备，所执行的各动作或处理过程。这里，为了避免赘述，省略其详细说明。
图12示出了本申请实施例的第一RAN设备1200的示意性框图，该第一RAN设备1200可以对应(例如，可以配置于或本身即为)上述方法900中描述的第一RAN设备，或其他实施方式中描述的控制DCC小区的RAN设备。该第一RAN设备1200可以包括：处理器1201和收发器1202，处理器1201和收发器1202通信耦合。可选地，该第一RAN设备1200还包括存储器1203，存储器1203与处理器1201通信耦合。可选地，处理器1201、存储器1203和收发器1202可以通信耦合，该存储器1203可以用于存储指令，该处理器1201用于执行该存储器1203存储的指令，以控制收发器1202接收和/或发送信息或信号。其中，处理器1201和收发器1202分别用于执行上述方法900中描述的第一RAN设备，或其他实施方式中描述的控制DCC小区的RAN设备，所执行的各动作或处理过程。这里，为了避免赘述，省略其详细说明。在第一RAN设备1200是CU-DU分离的架构的情况下，图12所示的第一RAN设备1200可以是第一RAN设备1200的CU，或者第一RAN设备1200的DU，或者第一RAN设备1200的CU-CP。
图13示出了本申请实施例的第一RAN设备1300的另一示意性框图，该第一RAN设备1300可以对应(例如，可以配置于或本身即为)上述方法900中描述的第一RAN设备，或其他实施方式中描述的控制DCC小区的RAN设备。该第一RAN设备1300可以包括：接收模块1301、处理模块1302和发送模块 1303，处理模块1302分别和接收模块1301和发送模块1303通信耦合。第一RAN设备1300可以采用图12所示的形式。其中，处理模块1302可以通过图12中的处理器1201来实现，接收模块1301和/或发送模块1303可以通过图12中的收发器1202来实现。第一RAN设备1300可还可包括存储单元，用于存储处理模块1302要执行的程序或数据、或存储通过接收模块1301接收和/或通过发送模块1303发送的信息。该第一RAN设备1300中各模块或单元分别用于执行上述方法900中描述的第一RAN设备，或其他实施方式中描述的控制DCC小区的RAN设备，所执行的各动作或处理过程。这里，为了避免赘述，省略其详细说明。在第一RAN设备1300是CU-DU分离的架构的情况下，图13所示的第一RAN设备1300可以是第一RAN设备1300的CU，或者第一RAN设备1300的DU，或者第一RAN设备1300的CU-CP。
图14示出了本申请实施例的第二RAN设备1400的示意性框图，该第二RAN设备1400可以对应(例如，可以配置于或本身即为)上述方法400中描述的RAN设备，或上述方法500中描述的RAN设备，或上述方法600中描述的RAN设备，或上述方法700中描述的RAN设备，或上述方法800中描述的RAN设备，上述方法900中描述的第二RAN设备，或其他实施方式中描述的控制BCC小区的RAN设备。该第二RAN设备1400可以包括：处理器1401和收发器1402，处理器1401和收发器1402通信耦合。可选地，该第二RAN设备1400还包括存储器1403，存储器1403与处理器1401通信耦合。可选地，处理器1401、存储器1403和收发器1402可以通信耦合，该存储器1403可以用于存储指令，该处理器1401用于执行该存储器1403存储的指令，以控制收发器1402接收和/或发送信息或信号。其中，处理器1401和收发器1402分别用于执行上述方法400中描述的RAN设备，或上述方法500中描述的RAN设备，或上述方法600中描述的RAN设备，或上述方法700中描述的RAN设备，或上述方法800中描述的RAN设备，上述方法900中描述的第二RAN设备，或其他实施方式中描述的控制BCC小区的RAN设备，所执行的各动作或处理过程。这里，为了避免赘述，省略其详细说明。在第二RAN设备1400是CU-DU分离的架构的情况下，图14所示的第二RAN设备1400可以是第二RAN设备1400的CU，或者第二RAN设备1400的DU，或者第二RAN设备1400的CU-CP。
图15示出了本申请实施例的第二RAN设备1500的另一示意性框图，该第二RAN设备1500可以对应(例如，可以配置于或本身即为)上述方法400中描述的RAN设备，或上述方法500中描述的RAN设备，或上述方法600中描述的RAN设备，或上述方法700中描述的RAN设备，或上述方法800中描述的RAN设备，上述方法900中描述的第二RAN设备，或其他实施方式中描述的控制BCC小区的RAN设备。该第二RAN设备1500可以包括：接收模块1501、处理模块1502和发送模块1503，处理模块1502分别和接收模块1501和发送模块1503通信耦合。第二RAN设备1500可以采用图14所示的形式。其中，处理模块1502可以通过图14中的处理器1401来实现，接收模块1501和/或发送模块1503可以通过图14中的收发器1402来实现。第二RAN设备1500可还可包括存储单元，用于存储处理模块1502要执行的程序或数据、或存储通过接收模块1501接收和/或通过发送模块1503发送的信息。该第二RAN设备1500中各模块或单元分别用于执行上述方法400中描述的RAN设备，或上述方法500中描述的RAN设备，或上述方法600中描述的RAN设备，或上述方法700中描述的RAN设备，或上述方法800中描述的RAN设备，上述方法900中描述的第二RAN设备，或其他实施方式中描述的控制BCC小区的RAN设备，所执行的各动作或处理过程。这里，为了避免赘述，省略其详细说明。在第二RAN设备1500是CU-DU分离的架构的情况下，图15所示的第二RAN设备1500可以是第二RAN设备1500的CU，或者第二RAN设备1500的DU，或者第二RAN设备1500的CU-CP。
应理解，本申请的装置实施例中的处理器(1001、1201、1401)可以是中央处理器(central processing unit,CPU)，网络处理器(network processor,NP)，硬件芯片或者其任意组合。上述硬件芯片可以是专用集成电路(application-specific integrated circuit,ASIC)，可编程逻辑器件(programmable logic device,PLD) 或其组合。上述PLD可以是复杂可编程逻辑器件(complex programmable logic device,CPLD)，现场可编程逻辑门阵列(field-programmable gate array,FPGA)，通用阵列逻辑(generic array logic,GAL)或其任意组合。
本申请的装置实施例中的存储器(1003、1203、1403)可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory,RAM)；也可以是非易失性存储器(non-volatile memory)，例如只读存储器(read-only memory,ROM)，快闪存储器(flash memory)，硬盘(hard disk drive,HDD)或固态硬盘(solid-state drive,SSD)；还可以是上述种类的存储器的组合。
在本申请所提供的几个实施例中，应该理解到，所揭露的装置和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信耦合可以是通过一些接口，装置或单元的间接耦合或通信耦合，可以是电性，机械或其它的形式。
作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本专利申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。
功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本专利申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包含若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本专利申请各个实施例方法的全部或部分步骤。而前述的存储介质包含：U盘、移动硬盘、只读存储器(read-only memory,ROM)、随机存取存储器(random access memory,RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上，仅为本专利申请的具体实施方式，但本专利申请的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本专利申请揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本专利申请的保护范围之内。因此，本专利申请的保护范围应以权利要求的保护范围为准。

Claims (38)

  1. 一种用于系统信息的传递方法，其特征在于，包括：
    终端设备向无线接入网RAN设备发送第一请求，所述第一请求包含第一信息，所述第一信息用于指示以下至少一项：所述终端设备期望接入第二小区、所述终端设备期望接入的第二小区、所述终端设备的至少部分标识，所述第一请求用于所述终端设备与所述RAN设备控制的第一小区建立无线资源控制RRC连接；
    所述终端设备接收来自RAN设备的所述第一请求的第一响应，所述第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
  2. 根据权利要求1所述的方法，其特征在于，所述终端设备向无线接入网RAN设备发送第一请求之前，该方法还包括：
    所述终端设备向所述RAN设备发送随机接入前导；
    所述终端设备接收来自所述RAN设备的随机接入响应。
  3. 根据权利要求1或2所述的方法，其特征在于，所述第一小区发送所述终端设备初始接入所述第一小区所需的系统信息，所述第二小区部分发送或不发送所述终端设备初始接入所述第二小区所需的系统信息。
  4. 根据权利要求1至3中任一项所述的方法，其特征在于，所述第一信息用于指示所述终端设备的至少部分标识，包括：
    所述第一信息包含第五代5G核心网为所述终端设备提供的临时终端设备标识中的至少部分标识。
  5. 根据权利要求1至4中任一项所述的方法，其特征在于，所述第二小区的部分系统信息，包括所述第二小区的剩余最小系统信息RMSI，或所述第二小区的RMSI和其他系统信息OSI。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述第一请求是RRC连接请求消息或RRC建立请求消息。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述第一响应是RRC拒绝消息或RRC连接拒绝消息。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述第二小区是新无线NR小区。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述终端设备向无线接入网RAN设备发送第一请求，包括所述终端设备通过所述RAN设备的分布式单元DU向所述RAN设备的集中单元CU发送所述第一请求；所述终端设备接收来自RAN设备的所述第一请求的第一响应，包括所述终端设备接收来自所述CU通过所述DU发送的所述第一响应；所述DU与所述CU连接。
  10. 一种用于系统信息的传递方法，其特征在于，包括：
    无线接入网RAN设备接收来自终端设备的第一请求，所述第一请求包含第一信息，所述第一信息用于指示以下至少一项：所述终端设备期望接入第二小区、所述终端设备期望接入的第二小区、所述终端设备的至少部分标识，所述第一请求用于所述终端设备与所述RAN设备控制的第一小区建立无线资源控制RRC连接；
    所述RAN设备向所述终端设备发送所述第一请求的第一响应，所述第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
  11. 根据权利要求10所述的方法，其特征在于，所述RAN设备接收来自终端设备的第一请求之前，该方法还包括：
    所述RAN设备接收来自所述终端设备的随机接入前导；
    所述RAN设备向所述终端设备发送随机接入响应。
  12. 根据权利要求10或11所述的方法，其特征在于，所述无线接入网RAN设备接收来自终端设备的第一请求之前，该方法还包括：
    所述RAN设备获取所述一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
  13. 根据权利要求10至12中任一项所述的方法，其特征在于，所述第一小区发送所述终端设备初始接入所述第一小区所需的系统信息，所述第二小区部分发送或不发送所述终端设备初始接入所述第二小区所需的系统信息。
  14. 根据权利要求10至13中任一项所述的方法，其特征在于，所述第二小区的部分系统信息，包括所述第二小区的剩余最小系统信息RMSI，或所述第二小区的RMSI和其他系统信息OSI。
  15. 根据权利要求10至14中任一项所述的方法，其特征在于，所述第一请求是RRC连接请求消息或RRC建立请求消息。
  16. 根据权利要求10至15中任一项所述的方法，其特征在于，所述第一响应是RRC拒绝消息或RRC连接拒绝消息。
  17. 根据权利要求10至16中任一项所述的方法，其特征在于，所述第二小区是新无线NR小区。
  18. 根据权利要求10至17中任一项所述的方法，其特征在于，所述无线接入网RAN设备接收来自终端设备的第一请求，包括所述RAN设备的集中单元CU通过分布式单元DU接收来自所述终端设备的所述第一请求；所述RAN设备向所述终端设备发送所述第一请求的第一响应，包括所述CU通过所述DU向所述终端设备发送所述第一响应；所述DU与所述CU连接。
  19. 一种终端设备，其特征在于，所述终端设备包括处理器和收发器，其中，
    所述处理器，用于确定第一信息，所述第一信息用于指示以下至少一项：所述终端设备期望接入第二小区、所述终端设备期望接入的第二小区、所述终端设备的至少部分标识；
    所述收发器与所述处理器通信耦合，用于向无线接入网RAN设备发送所述第一请求，所述第一请求包含所述第一信息，所述第一请求用于所述终端设备与所述RAN设备控制的第一小区建立无线资源控制RRC连接；
    所述收发器，用于接收来自所述RAN设备的所述第一请求的第一响应，所述第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
  20. 根据权利要求19所述的终端设备，其特征在于，还包括：
    所述收发器，用于向所述RAN设备发送随机接入前导；
    所述收发器，用于接收来自所述RAN设备的随机接入响应。
  21. 根据权利要求19或20所述的终端设备，其特征在于，所述第一小区发送所述终端设备初始接入所述第一小区所需的系统信息，所述第二小区部分发送或不发送所述终端设备初始接入所述第二小区所需的系统信息。
  22. 根据权利要求19至21中任一项所述的终端设备，其特征在于，所述第一信息用于指示所述终端设备的至少部分标识，包括：
    所述第一信息包含第五代5G核心网为所述终端设备提供的临时终端设备标识中的至少部分标识。
  23. 根据权利要求19至22中任一项所述的终端设备，其特征在于，所述第二小区的部分系统信息，包括所述第二小区的剩余最小系统信息RMSI，或所述第二小区的RMSI和其他系统信息OSI。
  24. 根据权利要求19至23中任一项所述的终端设备，其特征在于，所述第一请求是RRC连接请求消息或RRC建立请求消息。
  25. 根据权利要求19至24中任一项所述的终端设备，其特征在于，所述第一响应是RRC拒绝消息 或RRC连接拒绝消息。
  26. 根据权利要求19至25中任一项所述的终端设备，其特征在于，所述第二小区是新无线NR小区。
  27. 根据权利要求19至26中任一项所述的终端设备，其特征在于，所述收发器向无线接入网RAN设备发送第一请求，包括所述收发器通过所述RAN设备的分布式单元DU向所述RAN设备的集中单元CU发送所述第一请求；所述收发器接收来自RAN设备的所述第一请求的第一响应，包括所述收发器接收来自所述CU通过所述DU发送的所述第一响应；所述DU与所述CU连接。
  28. 一种无线接入网RAN设备，所述RAN设备包括处理器和收发器，其中，
    所述收发器，用于接收来自终端设备的第一请求，所述第一请求包含第一信息，所述第一信息用于指示以下至少一项：所述终端设备期望接入第二小区、所述终端设备期望接入的第二小区、所述终端设备的至少部分标识，所述第一请求用于所述终端设备与所述RAN设备控制的第一小区建立无线资源控制RRC连接；
    所述处理器与所述收发器耦合，用于确定所述第一请求的第一响应，所述第一响应包含一个或多个第二小区中各个第二小区的小区标识和部分系统信息；
    所述收发器，用于向所述终端设备发送所述第一响应。
  29. 根据权利要求28所述的RAN设备，其特征在于，还包括：
    所述收发器，用于接收来自所述终端设备的随机接入前导；
    所述收发器，用于向所述终端设备发送随机接入响应。
  30. 根据权利要求28或29所述的RAN设备，还包括：
    所述处理器，用于获取所述一个或多个第二小区中各个第二小区的小区标识和部分系统信息。
  31. 根据权利要求28至30中任一项所述的RAN设备，其特征在于，所述第一小区发送所述终端设备初始接入所述第一小区所需的系统信息，所述第二小区部分发送或不发送所述终端设备初始接入所述第二小区所需的系统信息。
  32. 根据权利要求28至31中任一项所述的RAN设备，其特征在于，所述第二小区的部分系统信息，包括所述第二小区的剩余最小系统信息RMSI，或所述第二小区的RMSI和其他系统信息OSI。
  33. 根据权利要求28至32中任一项所述的RAN设备，其特征在于，所述第一请求是RRC连接请求消息或RRC建立请求消息。
  34. 根据权利要求28至33中任一项所述的RAN设备，其特征在于，所述第一响应是RRC拒绝消息或RRC连接拒绝消息。
  35. 根据权利要求28至34中任一项所述的RAN设备，其特征在于，所述第二小区是新无线NR小区。
  36. 根据权利要求28至35中任一项所述的RAN设备，其特征在于，所述收发器接收来自终端设备的第一请求，包括所述RAN设备的集中单元CU通过分布式单元DU接收来自所述终端设备的所述第一请求；所述收发器向所述终端设备发送所述第一响应，包括所述CU通过所述DU向所述终端设备发送所述第一响应；所述DU与所述CU连接。
  37. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机指令，当所述指令在计算机上运行时，使得计算机执行如权利要求1至9中任一项所述的方法。
  38. 一种计算机可读存储介质，其特征在于，所述计算机可读存储介质存储有计算机指令，当所述指令在计算机上运行时，使得计算机执行如权利要求10至18中任一项所述的方法。
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