WO2021203955A1 - 一种无线接入模式指示方法及装置 - Google Patents

一种无线接入模式指示方法及装置 Download PDF

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Publication number
WO2021203955A1
WO2021203955A1 PCT/CN2021/082116 CN2021082116W WO2021203955A1 WO 2021203955 A1 WO2021203955 A1 WO 2021203955A1 CN 2021082116 W CN2021082116 W CN 2021082116W WO 2021203955 A1 WO2021203955 A1 WO 2021203955A1
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network element
cell
radio access
access network
node
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PCT/CN2021/082116
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English (en)
French (fr)
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周叶
刘爱娟
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大唐移动通信设备有限公司
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Publication of WO2021203955A1 publication Critical patent/WO2021203955A1/zh

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    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/16—Discovering, processing access restriction or access information

Definitions

  • This application relates to the field of wireless communication technology, and in particular to a method and device for indicating a wireless access mode.
  • CA Carrier Aggregation
  • DC Dual Connectivity
  • 5G Radio Access Network (New Generation-Radio Access Network, NG-RAN) allows the use of Evolved Universal Terrestrial Radio Access (E-UTRA) and New Radio (NR) Wireless access technology.
  • E-UTRA Evolved Universal Terrestrial Radio Access
  • NR New Radio
  • the types of wireless access cells are further diversified, further highlighting the importance of CA and DC.
  • the industry believes that in the wireless access network, some cells can only support the non-independent mode, that is, they cannot be designated as PCell.
  • all cells in a radio access network node may only support the non-independent mode, which means that the radio access network node can only serve as a secondary node to provide services for the terminal.
  • the radio access network element may erroneously trigger the handover process with these cells as the target cell (that is, the PCell after handover), resulting in handover failure.
  • the embodiments of the application provide a wireless access mode indication method and device, which are used to indicate the wireless access mode between the network elements of the wireless access network, thereby avoiding handover failure caused by the target cell only supporting the non-independent mode .
  • a method for indicating a wireless access mode including:
  • the first network element in the wireless access network determines the wireless access mode related to the first network element; wherein the wireless access mode related to the first network element includes: at least one of the first network element The wireless access mode of the cell, or the wireless access mode of the first network element;
  • a first network element in the radio access network sends a first message to a second network element in the radio access network, the first message carrying indication information of the radio access mode related to the first network element;
  • the indication information of the wireless access mode related to the first network element is used to indicate at least one of the following:
  • At least one cell under the first network element may be designated as a primary cell
  • At least one cell under the first network element cannot be designated as a primary cell
  • the first network element may configure a primary cell group
  • the first network element cannot be configured with a primary cell group
  • the first network element can serve as a master node in dual connectivity or can serve as a wireless access network node to which a terminal is only connected;
  • the first network element cannot serve as the master node in dual connectivity and cannot serve as the only wireless access network node to which the terminal is connected.
  • the first network element and the second network element are a first radio access network node and a second radio access network node, respectively; the first network element in the radio access network is connected to the radio The second network element in the network sends a first message, where the first message carries indication information of the wireless access mode related to the first network element, and includes:
  • the first radio access network node sends a communication interface establishment request message or a node configuration update message to the second radio access network node, which carries information about all or part of the cells under the jurisdiction of the first radio access network node.
  • a cell list where corresponding indication information exists for at least one cell in the cell list, and the indication information is used to indicate at least one of the following:
  • the corresponding cell can be designated as the primary cell
  • the corresponding cell can be used as a special cell in the cell group
  • the corresponding cell cannot be designated as the primary cell
  • the corresponding cell cannot be used as a special cell in the cell group.
  • the first network element and the second network element are a first radio access network node and a second radio access network node, respectively; the first network element in the radio access network is connected to the radio The second network element in the network sends a first message, where the first message carries indication information of the wireless access mode related to the first network element, and includes:
  • the first radio access network node sends a communication interface establishment request message or a node configuration update message to the second radio access network node, which carries indication information of the radio access mode of the first radio access network node ,
  • the indication information is used to indicate at least one of the following:
  • the first radio access network node can only be used as a secondary node in dual connectivity, or SCG can be configured in the first radio access network node but MCG cannot be configured, or the first radio access network node is under the jurisdiction of None of the cells in can be designated as the primary cell;
  • the first radio access network node can be the master node in dual connectivity or the only radio access network node connected to the terminal, or the first radio access network node can be configured with MCG, or the first radio access network node can be configured with MCG, or the first radio access network node At least one cell among all the cells under the jurisdiction of a radio access network node can be designated as the primary cell.
  • the first network element is a distributed unit in a distributed radio access network node
  • the second network element is a centralized unit in the distributed radio access network node
  • the radio access network The first network element in the wireless access network sends a first message to the second network element in the wireless access network, where the first message carries indication information of the wireless access mode related to the first network element, and includes:
  • the distribution unit sends a communication interface establishment request message or a configuration update message or configuration update confirmation message of the distribution unit to the centralized unit, which carries a cell list of all or part of the cells under the jurisdiction of the distribution unit. At least one cell in the list has corresponding indication information, and the indication information is used to indicate at least one of the following:
  • the corresponding cell can be designated as the primary cell
  • the corresponding cell can be used as a special cell in the cell group
  • the corresponding cell cannot be designated as the primary cell
  • the corresponding cell cannot be used as a special cell in the cell group.
  • the method further includes: the central unit sending a third message to the radio access network node, which carries the cell list and the indication information.
  • the first network element is a distributed unit in a distributed radio access network node
  • the second network element is a centralized unit in the distributed radio access network node
  • the radio access network The first network element in the wireless access network sends a first message to the second network element in the wireless access network, where the first message carries indication information of the wireless access mode related to the first network element, and includes:
  • the distribution unit sends a communication interface establishment request message or a node configuration update message or a configuration update confirmation message to the centralized unit, which carries indication information of the wireless access mode of the distribution unit, and the indication information is used to indicate the following At least one of:
  • SCG can be configured in the distribution unit, or all cells under the jurisdiction of the distribution unit cannot be designated as primary cells;
  • the MCG can be configured in the distribution unit, or at least one cell among all the cells under the jurisdiction of the distribution unit can be designated as the primary cell.
  • the first network element and the second network element are a first radio access network node and a second radio access network node, respectively; the first network element in the radio access network is connected to the radio The second network element in the network sends a first message, where the first message carries indication information of the wireless access mode related to the first network element, and includes:
  • the first radio access network node sends a handover preparation failure message to the second radio access network node, which carries an indication that the handover target cell cannot be designated as a primary cell or cannot be a special cell in a cell group information.
  • the first network element is a distributed unit in a distributed radio access network node
  • the second network element is a centralized unit in the distributed radio access network node
  • the radio access network The first network element in the wireless access network sends a first message to the second network element in the wireless access network, where the first message carries indication information of the wireless access mode related to the first network element, and includes:
  • the distributing unit receives the terminal context establishment request message or the terminal context modification request message sent by the central unit, which carries the identity of the target cell;
  • the distribution unit sends a failure message to the centralization unit, which carries indication information for indicating that the target cell cannot be designated as a primary cell or as a special cell in a cell group.
  • a network device is provided, the network device is a first network element in a wireless access network, and the network device includes: a processor, a memory, and a transceiver;
  • the transceiver receives and sends data under the control of the processor
  • the memory stores computer instructions
  • the processor is configured to read the computer instructions and execute the method according to any one of the above-mentioned first aspects.
  • a wireless access mode indicating device including:
  • the processing module is configured to determine the wireless access mode related to the first network element; wherein the wireless access mode related to the first network element includes: wireless access of at least one cell under the first network element Mode, or the wireless access mode of the first network element;
  • a sending module configured to send a first message to a second network element in a radio access network, the first message carrying indication information of a radio access mode related to the first network element;
  • the indication information of the wireless access mode related to the first network element is used to indicate at least one of the following:
  • At least one cell under the first network element may be designated as a primary cell
  • At least one cell under the first network element cannot be designated as a primary cell
  • the first network element may configure a primary cell group
  • the first network element cannot be configured with a primary cell group
  • the first network element can serve as a master node in dual connectivity or can serve as a wireless access network node to which a terminal is only connected;
  • the first network element cannot serve as the master node in dual connectivity and cannot serve as the only wireless access network node to which the terminal is connected.
  • a computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to cause the computer to execute any of the above-mentioned first aspects. The method described.
  • the first network element in the radio access network sends the radio access mode of at least one cell under the first network element or the radio access mode of the first network element to the radio access network
  • the second network element in the wireless access network allows the network elements of the radio access network to exchange indication information to indicate whether the cell under its jurisdiction can be designated as a PCell, so as to prevent the cell that cannot be designated as the PCell as the target handover during cell handover Cell, thereby reducing the probability of handover failure in the wireless access network.
  • Fig. 1 exemplarily shows a schematic diagram of RAN with CU/DU separation
  • Figure 2 exemplarily shows a schematic diagram of an access mode indication process provided by an embodiment of the present application
  • FIG. 3 exemplarily shows a schematic flow chart of Example 1 in this application
  • FIG. 4 exemplarily shows a schematic flowchart of Example 2 in this application
  • FIG. 5 exemplarily shows a schematic flowchart of Example 3 in this application
  • FIG. 6 exemplarily shows a schematic flowchart of Example 4 in this application.
  • FIG. 7 exemplarily shows a schematic flowchart of Example 5 in this application.
  • FIG. 8 exemplarily shows a schematic flowchart of Example 6 in this application.
  • Fig. 9 exemplarily shows a schematic structural diagram of a network element device in an embodiment of the present application.
  • Fig. 10 exemplarily shows a schematic structural diagram of another network element device in this application.
  • Network equipment is a device that provides wireless communication functions for terminals, including but not limited to: gNB in 5G, radio network controller (RNC), node B (NB), base station Controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (for example, home evolved nodeB, or home node B, HNB), baseband unit (BaseBand Unit, BBU), transmission point ( transmitting and receiving point (TRP), (transmitting point, TP), mobile switching center, etc.
  • RNC radio network controller
  • NB node B
  • BSC base station Controller
  • base transceiver station base transceiver station
  • BTS home base station
  • home base station for example, home evolved nodeB, or home node B, HNB
  • baseband unit BaseBand Unit
  • TRP transmitting and receiving point
  • TP mobile switching center
  • the base station in this application may also be a device that provides wireless communication functions for terminals in other communication systems that may appear in the future.
  • a terminal is a device that can provide users with voice and/or data connectivity.
  • terminal devices include handheld devices with wireless connection functions, vehicle-mounted devices, and so on.
  • terminal devices can be: mobile phones (mobile phones), tablets, notebook computers, handheld computers, mobile Internet devices (MID), wearable devices, virtual reality (VR) devices, augmented reality (augmented reality (AR) equipment, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in smart grids, and transportation safety
  • a wireless terminal a wireless terminal in a smart city, or a wireless terminal in a smart home, etc.
  • radio access network elements need to exchange relevant information about the cells they control, and the exchanged cell-related information does not include information indicating whether the cell can be designated as a PCell. This means that if there is no manual control by the operator, other radio access network elements may erroneously trigger the handover process with these cells as the target cell (that is, the PCell after handover), resulting in handover failure.
  • the embodiment of the present application proposes a method for indicating the radio access mode, so that the network elements of the radio access network can exchange a kind of indication information for indicating whether the cells they control can be designated as PCells. In turn, the probability of handover failure in the wireless access network is reduced.
  • the embodiments of this application can be applied to radio access networks using carrier aggregation or dual connectivity technologies, and can also be applied to radio access networks (RAN) based on separation of centralized units (CU)/distributed units (DU). ).
  • RAN radio access networks
  • CU centralized units
  • DU distributed units
  • Carrier Aggregation (CA) and Dual Connectivity (DC) are both technologies that enable one terminal to access through multiple wireless access cells. These two technologies allow the network and a terminal to not only use one cell (PCell) to exchange data, but also to exchange data through other cells (PSCell or SCell). If the terminal is connected to the network through only one cell, the cell is called PCell.
  • the network and the terminal may interact with each other through a MAC protocol data unit (Protocol Data Unit, PDU) through one or more pairs of Media Access Control (MAC) instances.
  • PDU MAC protocol data unit
  • MAC Media Access Control
  • the network and the terminal only use a pair of MAC instances for MAC PDU interaction, then the connection between the network and the terminal is called “single connection”. If the network and the terminal use two pairs of MAC instances for MAC PDU interaction, then the connection between the network and the terminal is called “dual connection", which is DC.
  • the exchanged MAC PDUs can be transmitted through multiple cells. All cells used by a pair of MAC instances are collectively referred to as a cell group (Cell Group).
  • Cell Group Each connection between the network and the terminal has one and only one primary cell group (Master Cell Group, MCG), and there may also be one secondary cell group (Secondary Cell Group, SCG).
  • MCG Master Cell Group
  • SCG Secondary Cell Group
  • MCG and SCG are controlled by different radio access network (Radio Access Network Node, RAN) nodes
  • RAN Radio Access Network Node
  • the RAN node that controls the MCG is called the master node (Master Node, MN)
  • the RAN node that controls the SCG is called the secondary node ( Secondary Node, SN).
  • E-UTRA E-UTRA
  • NR NR-DC
  • All cells within each cell group are E-UTRA cells or NR cells.
  • the cells in MCG are all E-UTRA cells, and the cells in SCG are all NR cells.
  • the dual connection mode is called NGEN-DC (NG-RAN E-UTRA-NR DC), and the cells in MCG and SCG are both NR
  • NR-DC NR-NR DC
  • each cell group there is one and only one cell called SpCell (special cell), and other cells (if existing) are called SCell.
  • SpCell special cell
  • SCell other cells
  • the SpCell in the MCG is also called PCell
  • the SpCell in the SCG is also called PSCell.
  • the network side can also initiate a handover to change the PCell. Specifically, the handover initiator will designate a target cell (or multiple candidates in some scenarios) for handover. When the handover is completed, the handover target cell will automatically be the new PCell.
  • the radio access network node to which the target cell of the handover belongs is called the target node of the handover.
  • the network can notify the terminal that the cell cannot camp on through the system message broadcast of a certain cell, so that the terminal will not make the cell a PCell through the process of entering the connected state from the disconnected state.
  • the radio access network network elements do not exchange information about whether a certain cell can be used as a PCell.
  • the frequency points of the NR cell are divided into two types: frequency range 1 (Frequency Range 1, FR1) and FR2.
  • the frequency of the FR1 cell is usually located at 2 to 5 GHz, while the frequency of the FR2 cell is usually located at tens of GHz, and there is a big difference between the two.
  • FR1 cells usually cover a large area and are relatively stable, but with a narrow bandwidth, they are more suitable for providing basic coverage and are suitable for serving as PCell; while FR2 cells usually have a small coverage area and are relatively unstable, but with a large bandwidth, they are more suitable for hotspots.
  • Bandwidth enhancement Bandwidth enhancement.
  • Figure 1 exemplarily shows a CU/DU separation architecture.
  • the NR node connected to the 5GC (5G Core Network), that is, gNB is further separated into two parts, gNB-CU and gNB-DU.
  • the gNB-CU is connected to other RAN nodes through the Xn interface, and is connected to the 5GC through the NG interface;
  • the gNB-DU is connected to the terminal (UE) through the air interface, and is responsible for cell maintenance, such as sending system message broadcasts.
  • the gNB-CU and gNB-DU are connected through the F1 interface.
  • the gNB-DU can inform the gNB-CU of the relevant information of the cell it controls through the F1 interface, including the cell ID.
  • the target cell for handover is specified by gNB-CU. Specifically, the source RAN node will select a target cell. If the handover-related signaling is transmitted based on the Xn interface, the source RAN node can also specify multiple candidate target cells. If the source RAN node is a CU/DU separated gNB, then this target cell and possible candidate target cells are determined by the source gNB-CU. If the target RAN node of the handover is a CU/DU separated gNB, and the source node specifies multiple candidate target cells, the target gNB-CU will determine the target cell based on the measurement report and other information, and request the gNB-DU through the F1 interface Generate the cell group configuration of the terminal, where the target cell is the PCell.
  • the gNB-DU can reject this request and inform the gNB-CU that the target cell it has selected is not suitable for use as a PCell. At this time, if feasible, the gNB-CU can select other cells as the target cell. gNB-DU will not provide specific reasons for gNB-DU’s decision.
  • the gNB-DU is called the target gNB-DU.
  • Fig. 2 exemplarily shows a schematic flowchart of an access mode indication method provided by an embodiment of the present application.
  • This process describes the process in which the first network element in the radio access network indicates the access mode to the second network element.
  • the first network element and the second network element in the radio access network are two different RAN nodes, called the first RAN node and the second RAN node; in other embodiments, the wireless
  • the first network element and the second network element in the access network are the DU and CU in the distributed RAN node (gNB) with CU/DU separation, that is, the first network element is the DU in the gNB, and the second network element is the gNB CU in.
  • gNB distributed RAN node
  • the process can include:
  • the first network element determines a wireless access mode related to the first network element.
  • the wireless access mode related to the first network element may include: a wireless access mode of at least one cell under the first network element, or a wireless access mode of the first network element.
  • wireless access mode may also be referred to as “wireless access capability”, and the embodiment of the present application does not impose restrictions on the naming.
  • the radio access mode of a cell can be used to indicate whether the cell can be designated as a PCell.
  • the wireless access mode of a cell may include an independent mode and a non-independent mode.
  • the independent mode means that the cell can be designated as a PCell
  • the non-independent mode means that the cell cannot be designated as a PCell.
  • the radio access mode of a network element can be used to indicate whether all cells under the jurisdiction of the network element can be designated as PCells.
  • the wireless access mode of a network element can include independent mode and non-independent mode.
  • the independent mode means that all cells under the jurisdiction of the network element can be designated as PCell
  • the non-independent mode refers to the independent mode under the jurisdiction of the network element. None of the cells can be designated as PCell. If all the cells under the jurisdiction of a network element cannot be designated as PCell, the wireless access mode of the network element also means that the network element cannot be configured with a primary cell group, and the network element cannot be used as the primary cell in dual connectivity.
  • the node cannot be the only wireless access network node to which the terminal is connected.
  • FR1 cells usually cover a large area and are relatively stable, but have a narrow bandwidth, they are more suitable for providing basic coverage and are suitable for providing services as PCell.
  • FR2 cells usually have a small coverage area and are relatively unstable, but the bandwidth is relatively small. Larger, more suitable as a hotspot bandwidth enhancement. Therefore, the radio access mode of FR1 cell can be made independent mode, that is, FR1 cell can be designated as PCell, making the radio access mode of FR2 cell non-independent mode, namely FR2 cell Cannot be designated as PCell.
  • the wireless access mode of a cell (such as whether the cell can be designated as PCell), or the wireless access mode of a network element (such as whether all the cells under the jurisdiction of the network element can be designated as PCell) can be set according to the preset
  • the configuration information for obtaining can also be determined according to pre-configured rules. For example, if a cell is an FR2 cell, the cell cannot be designated as a PCell, which is not limited in the embodiment of the present application.
  • the first network element sends a first message to a second network element in the radio access network, which carries the indication information of the radio access mode related to the first network element.
  • the first network element determines the radio access mode of at least one cell under the first network element, and sends corresponding indication information in S202
  • the second network element can follow the indication information It is known whether the at least one cell can be designated as a PCell, and then for a cell that cannot be designated as a PCell, the corresponding cell will not be selected as the target cell of the handover when the handover is initiated.
  • the second network element can learn whether all cells under the first network element are Can be designated as PCell, and for cells that cannot be designated as PCell, the corresponding cell will not be selected as the target cell for handover when the handover is initiated, or in other words, all the cells under its jurisdiction cannot be designated as the network element of the PCell , When the handover is initiated, this network element will not be selected as the target network element for the handover.
  • the second network element may send a second message to the first network element, where the second message carries the indication information of the wireless access mode related to the second network element, thereby
  • the first network element can learn the radio access mode of the cell under the jurisdiction of the second network element, and for a cell that cannot be designated as a PCell, the corresponding cell will not be selected as the target cell of the handover when the handover is initiated. If all the cells under the jurisdiction of the second network element cannot be designated as the PCell, the second network element will not select the first network element as the handover target network element when initiating the handover.
  • the indication information of the wireless access mode related to the first network element may be used to indicate at least one of the following:
  • At least one cell under the first network element can be designated as the primary cell.
  • the first network element may send one or more cell identities (or other information for identifying a cell) and corresponding indication information to the second network element.
  • the indication information is used to indicate that the corresponding cell may be designated as Primary cell, that is, it has the ability to act as a primary cell.
  • At least one cell under the first network element cannot be designated as the primary cell.
  • the first network element may send one or more cell identities (or other information for identifying a cell) and corresponding indication information to the second network element.
  • the indication information is used to indicate that the corresponding cell cannot be designated as Primary cell, that is, does not have the ability to be a primary cell.
  • the first network element can configure the primary cell group.
  • the first network element may send an indication message to the second network element, and the indication information is used to indicate that the first network element can configure the MCG, that is, the first network element has the ability to configure the primary cell group.
  • the primary cell group cannot be configured for the first network element.
  • the first network element may send an indication message to the second network element, where the indication information is used to indicate that the first network element cannot configure the MCG, that is, the first network element does not have the ability to configure the primary cell group.
  • the first network element can be the master node in dual connectivity or can be the only wireless access network node to which the terminal is connected.
  • the first network element may send an indication message to the second network element, and the indication information is used to indicate that the first network element can be the master node in dual connectivity or can be the only radio access network node to which the terminal is connected, that is,
  • the first network element has the capability of being the master node in the dual connection or the only wireless access network node to which the terminal is connected.
  • the first network element cannot be the master node in dual connectivity and cannot be the only wireless access network node to which the terminal is connected.
  • the first network element may send an indication message to the second network element, the indication information is used to indicate that the first network element cannot be the master node in dual connectivity and cannot be the only wireless access network node to which the terminal is connected , That is, the first network element does not have the ability to be the master node in the dual connection and the only wireless access network node to which the terminal is connected.
  • the indication information of the wireless access mode related to the second network element may be used to indicate at least one of the following:
  • At least one cell under the second network element may be designated as the primary cell
  • At least one cell under the second network element cannot be designated as the primary cell
  • the second network element can configure the primary cell group
  • the second network element cannot be configured with a primary cell group
  • the second network element can serve as the master node in dual connectivity or can serve as the only wireless access network node to which the terminal is connected;
  • the second network element cannot serve as the master node in dual connectivity and cannot serve as the only wireless access network node to which the terminal is connected.
  • the first network element in the radio access network sends the radio access mode of at least one cell under the first network element or the radio access mode of the first network element to the radio access
  • the second network element in the network enables the network elements of the radio access network to exchange indication information to indicate whether the cell under its jurisdiction can be designated as a PCell, so as to prevent the cell that cannot be designated as the PCell as the target during cell handover Switch the cell, thereby reducing the probability of handover failure in the wireless access network.
  • the above-mentioned indication information may be exchanged in the process of establishing an interface communication connection that is not related to the terminal, or in the process of information configuration that is not related to the terminal, or in the handover process related to the terminal.
  • the RAN node 1 is used as the first network element, and the RAN node 2 as the second network element is indicated to the RAN node 2 as the second network element through a message irrelevant to the terminal on the Xn interface.
  • the process can include:
  • RAN node 1 sends an Xn establishment request message or NG-RAN node configuration update message to RAN node 2, which contains a list of cells administered by RAN node 1 (the list may include all cells or some cells administered by RAN node 1) , For at least one of the cells in the cell list, the indication information whether the cell can be designated as a PCell is included.
  • the foregoing indication information of a cell may be used to indicate at least one of the following contents:
  • the indication information can indicate that the corresponding cell can be used as the PCell in the MCG, or the corresponding cell can be used as the PSCell in the SGC;
  • the indication information may indicate that the corresponding cell cannot be used as the PCell in the MCG, or indicate that the corresponding cell cannot be used as the PSCell in the SCG.
  • the RAN node 2 After receiving this message, the RAN node 2 can learn which cell or cells in the RAN node 1 cannot be used as the PCell according to the indication information, and thus will not select the corresponding cell as the target cell of the handover when initiating the handover.
  • the RAN node 2 sends a corresponding response message to the RAN node 1.
  • the message sent in 301 is an Xn establishment request message
  • the message sent in 302 is an Xn establishment response message
  • the message sent in 301 is an NG-RAN node configuration update message
  • the message sent in 302 The message is an NG-RAN node configuration update confirmation message.
  • the response message may include a list of cells administered by RAN node 2 (the list may include all or part of the cells administered by RAN node 1), and in the cell list, for at least one of the cells, the list includes the Indication information of whether a cell can be designated as a PCell.
  • the RAN node 1 can learn which cell or cells in the RAN node 2 cannot serve as the PCell according to the indication information, and thus will not select the corresponding cell as the target cell of the handover when initiating the handover.
  • RAN node 1 is used as the first network element
  • the RAN node 2 as the second network element is indicated to the RAN node 2 as the second network element through a message irrelevant to the terminal on the Xn interface whether the RAN node 1 can only be used as a secondary node.
  • the process can include:
  • the RAN node 1 sends an Xn establishment request message or an NG-RAN node configuration update message to the RAN node 2, which contains the indication information of whether the RAN node 1 can only be a secondary node in a dual connectivity (DC). Equivalently, the indication information may also be indication information in the RAN node 1 whether only SCG can be configured.
  • DC dual connectivity
  • the indication information may indicate at least one of the following contents:
  • the RAN node 1 can only serve as a secondary node in the DC to provide services for the terminal. Equivalently, the indication information can also be used to indicate that only SCG can be configured in RAN node 1, but MCG cannot be configured. Equivalently, the indication information can also be used to indicate that all cells under the jurisdiction of RAN node 1 cannot be used as PCells;
  • the RAN node 1 can be used as the master node in the DC or as the only radio access network node to which the terminal is connected. Equivalently, the indication information can also be used to indicate that the MCG can be configured in the RAN node 1. Equivalently, the indication information can also be used to indicate that among all the cells under the jurisdiction of the RAN node 1, at least one cell can be used as a PCell.
  • the RAN node 2 can learn whether the MCG can be configured in the RAN node 1 according to the indication information. If the indication information indicates that MCG cannot be configured in RAN node 1, but only SCG, then RAN node 2 will not select RAN node 1 as the target node of the handover when initiating handover.
  • the RAN node 2 sends a corresponding response message to the RAN node 1.
  • the message sent in 401 is an Xn establishment request message
  • the message sent in 402 is an Xn establishment response message
  • the message sent in 401 is an NG-RAN node configuration update message
  • the message sent in 402 The message is an NG-RAN node configuration update confirmation message.
  • the response message may include indication information of whether the RAN node 2 can only serve as a secondary node in dual connectivity (DC). Equivalently, the indication information may also be indication information in the RAN node 2 whether only SCG can be configured.
  • the RAN node 1 can learn whether the MCG can be configured in the RAN node 2 according to the indication information. If the indication information indicates that MCG cannot be configured in RAN node 2 but only SCG can be configured, then RAN node 1 will not select RAN node 2 as the target node of the handover when initiating handover.
  • the DU (gNB-DU) in the gNB is used as the first network element, and a message irrelevant to the terminal is used on the F1 interface to indicate to the CU (gNB-CU) in the gNB as the second network element
  • One or more cells cannot be used as PCell.
  • the process can include:
  • the gNB-DU sends an F1 establishment request message or a gNB-DU configuration update message or a gNB-CU configuration update confirmation message to the gNB-CU, which contains a list of cells governed by the gNB-DU (the list may include the list of cells governed by RAN node 1). All or part of the cells in the cell list), for at least one cell in the cell list, the indication information whether the cell can be designated as a PCell is included.
  • this indication information can be used to indicate at least any one of the following four points:
  • the indication information can indicate that the corresponding cell can be used as the PCell in the MCG, or indicate that the corresponding cell can be used as the PSCell in the SCG;
  • the indication information may indicate that the corresponding cell cannot be used as the PCell in the MCG, or indicate that the corresponding cell cannot be used as the PSCell in the SCG.
  • the gNB-CU After receiving the message, the gNB-CU can learn which cell or cells in the gNB-DU cannot serve as the PCell according to the indication information, and then will not select the corresponding cell as the target cell of the handover when initiating the handover.
  • process may also include the following steps:
  • the gNB-CU On behalf of the gNB, the gNB-CU sends an Xn interface message to other RAN nodes, which contains the cell list it has received from the gNB-DU and the above-mentioned indication information.
  • the other RAN node After receiving this message, the other RAN node can learn which cell or cells in the cell list cannot be used as the PCell according to the indication information, and thus will not select the corresponding cell as the target cell of the handover when initiating the handover.
  • the DU (gNB-DU) in the gNB is used as the first network element, and a message irrelevant to the terminal is used on the F1 interface to indicate to the CU (gNB-CU) in the gNB as the second network element Whether MCG can be configured in gNB-DU.
  • the process can include:
  • the gNB-DU sends an F1 establishment request message or a gNB-DU configuration update message or a gNB-CU configuration update confirmation message to the gNB-CU, which contains the indication information of whether the gNB-DU can only be configured with SCG and cannot be configured with MCG .
  • the indication information can indicate at least one of the following:
  • the indication information can also be used to indicate that all cells under the jurisdiction of the gNB-DU cannot be used as PCells;
  • the indication information can also be used to indicate that among all the cells under the jurisdiction of the gNB-DU, at least one cell can be used as a PCell.
  • the gNB-CU can learn whether the MCG can be configured in the gNB-DU according to the indication information. If the indication information indicates that the gNB-DU cannot be configured with MCG but only SCG, then the gNB-CU will not select the gNB-DU as the target gNB-DU for the handover when initiating the handover.
  • the RAN node 2 is used as the first network element, and a terminal-related message is used on the Xn interface to indicate to the RAN node 1 as the second network element that a cell can serve as a PCell.
  • the process can include:
  • the RAN node 1 For a certain terminal, the RAN node 1 sends a handover request message to the RAN node 2, which specifies the target cell for handover.
  • the RAN node 2 sends a handover preparation failure message to the RAN node 1, which contains a reason value, which can indicate that the reason for the handover failure is that the specified target cell cannot be used as a PCell.
  • the cause value can be directly used to indicate that the specified target cell cannot be used as a PCell, or can be used to indicate that the specified target cell cannot be used as a SpCell.
  • the RAN node 1 After receiving this message, the RAN node 1 can learn that the cell cannot be used as the PCell according to the cause value, and then will not select the cell as the target cell for the handover in subsequent handovers.
  • this example uses the handover failure reason value to indicate that the specified target cell cannot be used as a SpCell, in other embodiments of this application, it is not excluded to use other indication information or custom indication information to indicate the foregoing content.
  • the DU (gNB-DU) in the gNB is used as the first network element, and the terminal-related message is used on the F1 interface to indicate to the CU (gNB-CU) in the gNB as the second network element A cell cannot be used as a PCell.
  • the process can include:
  • the gNB-CU sends a terminal context establishment request message or a terminal context modification request message to gNB-DU, which specifies a target cell (for example, carries the identity of the target cell), and the target cell ends the process The latter should be used as SpCell.
  • a target cell for example, carries the identity of the target cell
  • the gNB-DU sends a corresponding failure message to the gNB-CU.
  • the failure message sent in 802 is a terminal context establishment failure message; if the message sent in 801 is a terminal context modification request message, then The failure message sent in 802 is a terminal context modification failure message.
  • the failure message contains a reason value, which can indicate that the reason for the failure of this handover is that the specified cell cannot be used as a PCell.
  • the cause value can be directly used to indicate that the specified cell cannot be used as a PCell, or can be used to indicate that the specified cell cannot be used as a SpCell.
  • the RAN node 1 After receiving the failure message, the RAN node 1 can learn that the cell cannot be used as the PCell according to the cause value, and then will not select the cell as the target cell of the handover in the subsequent handover.
  • an embodiment of the present application also provides a network element device, which can implement the functions of the network element device side in the foregoing embodiment.
  • FIG. 9 exemplarily shows the structure of a radio access mode indicating device in an embodiment of the present application.
  • the radio access mode indicating device may be a first network element in a radio access network, and the first network element may be a RAN
  • the node may also be a distributed unit (gNB-DU) in a distributed RAN node.
  • the network radio access mode indicating device may include: a processing module 901, a sending module 902, and a receiving module 903.
  • the processing module 901 is configured to determine the wireless access mode related to the first network element; wherein the wireless access mode related to the first network element includes: the wireless access mode of at least one cell under the first network element Access mode, or the wireless access mode of the first network element;
  • the sending module 902 is configured to send a first message to a second network element in the radio access network, where the first message carries indication information of the radio access mode related to the first network element.
  • the indication information of the wireless access mode related to the first network element is used to indicate at least one of the following:
  • At least one cell under the first network element may be designated as a primary cell
  • At least one cell under the first network element cannot be designated as a primary cell
  • the first network element may configure a primary cell group
  • the first network element cannot be configured with a primary cell group
  • the first network element can serve as a master node in dual connectivity or can serve as a wireless access network node to which a terminal is only connected;
  • the first network element cannot serve as the master node in dual connectivity and cannot serve as the only wireless access network node to which the terminal is connected.
  • the first network element and the second network element are a first RAN node and a second RAN node, respectively.
  • the sending module 902 may be specifically configured to send a communication interface establishment request message or a node configuration update message to the second RAN node, which carries a cell list of all or part of the cells under the jurisdiction of the first RAN node, so At least one cell in the cell list has corresponding indication information, and the indication information is used to indicate at least one of the following:
  • the corresponding cell can be designated as the primary cell
  • the corresponding cell can be used as a special cell in the cell group
  • the corresponding cell cannot be designated as the primary cell
  • the corresponding cell cannot be used as a special cell in the cell group.
  • the first network element and the second network element are a first RAN node and a second RAN node, respectively.
  • the sending module 902 is specifically configured to send a communication interface establishment request message or a node configuration update message to the second RAN node, which carries indication information of the radio access mode of the first RAN node, and the indication information Used to indicate at least one of the following:
  • the first RAN node can only serve as a secondary node in dual connectivity, or the SCG but not MCG can be configured in the first radio access network node, or all the cells under the jurisdiction of the first RAN node cannot be Designated as the primary cell;
  • the first RAN node can be the master node in dual connectivity or the only radio access network node connected to the terminal, or the first RAN node can be configured with MCG, or the first RAN node can be managed At least one cell among all the cells can be designated as the primary cell.
  • the first network element is a distributed unit in a distributed RAN node
  • the second network element is a centralized unit in the distributed RAN node
  • the sending module 902 is specifically configured to send a communication interface establishment request message or a configuration update message or configuration update confirmation message of the distribution unit to the centralized unit, which carries information about all or part of the cells under the jurisdiction of the distribution unit.
  • a cell list where corresponding indication information exists for at least one cell in the cell list, and the indication information is used to indicate at least one of the following:
  • the corresponding cell can be designated as the primary cell
  • the corresponding cell can be used as a special cell in the cell group
  • the corresponding cell cannot be designated as the primary cell
  • the corresponding cell cannot be used as a special cell in the cell group.
  • the first network element is a distributed unit in a distributed RAN node
  • the second network element is a centralized unit in the distributed RAN node.
  • the sending module 902 is specifically configured to send a communication interface establishment request message or a node configuration update message or a configuration update confirmation message to the centralized unit, which carries the indication information of the wireless access mode of the distribution unit, and the indication Information is used to indicate at least one of the following:
  • SCG can be configured in the distribution unit, or all cells under the jurisdiction of the distribution unit cannot be designated as primary cells;
  • the MCG can be configured in the distribution unit, or at least one cell among all the cells under the jurisdiction of the distribution unit can be designated as the primary cell.
  • the first network element and the second network element are a first RAN node and a second RAN node, respectively.
  • the receiving module 903 is specifically configured to: receive a handover request message sent by the second RAN node; the sending module 902 is specifically configured to: send a handover preparation failure message to the second RAN node, which carries a handover target
  • the cell cannot be designated as a primary cell or can not be used as an indication information of a special cell in a cell group.
  • the first network element is a distributed unit in a distributed RAN node
  • the second network element is a centralized unit in the distributed RAN node.
  • the receiving module 903 is specifically configured to: receive a terminal context establishment request message or a terminal context modification request message sent by the centralized unit, which carries the identity of the target cell; the sending module 902 is specifically configured to: fail to send to the centralized unit A message, which carries indication information used to indicate that the target cell cannot be designated as a primary cell or as a special cell in a cell group.
  • an embodiment of the present application also provides a network device, which can implement the functions of the first network element side in the foregoing embodiment.
  • Fig. 10 exemplarily shows a schematic structural diagram of a network device in an embodiment of the present application.
  • the network device may include: a processor 1001, a memory 1002, a transceiver 1003, and a bus interface 1004.
  • the processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 can store data used by the processor 1001 when performing operations.
  • the transceiver 1003 is used to receive and transmit data under the control of the processor 1001.
  • the bus architecture may include any number of interconnected buses and bridges. Specifically, one or more processors represented by the processor 1001 and various circuits of the memory represented by the memory 1002 are linked together.
  • the bus architecture can also link various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are all known in the art, and therefore, will not be further described herein.
  • the bus interface provides the interface.
  • the processor 1001 is responsible for managing the bus architecture and general processing, and the memory 1002 can store data used by the processor 1001 when performing operations.
  • the process disclosed in the embodiment of the present application may be applied to the processor 1001 or implemented by the processor 1001.
  • each step of the signal processing flow can be completed by an integrated logic circuit of hardware in the processor 1001 or instructions in the form of software.
  • the processor 1001 may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or execute the The disclosed methods, steps and logic block diagrams.
  • the general-purpose processor may be a microprocessor or any conventional processor or the like.
  • the steps of the method disclosed in combination with the embodiments of the present application may be directly embodied as being executed and completed by a hardware processor, or executed and completed by a combination of hardware and software modules in the processor.
  • the software module can be located in a mature storage medium in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers.
  • the storage medium is located in the memory 1002, and the processor 1001 reads the information in the memory 1002, and completes the steps of the signal processing flow in combination with its hardware.
  • the processor 1001 may read computer instructions in the memory 1002 and perform the following operations:
  • the wireless access mode related to the first network element includes: the wireless access mode of at least one cell under the first network element, or the The wireless access mode of the first network element;
  • the radio access mode related to the first network element Instruction information for entering mode, used to indicate at least one of the following:
  • At least one cell under the first network element may be designated as a primary cell
  • At least one cell under the first network element cannot be designated as a primary cell
  • the first network element may configure a primary cell group
  • the first network element cannot be configured with a primary cell group
  • the first network element can serve as a master node in dual connectivity or can serve as a wireless access network node to which a terminal is only connected;
  • the first network element cannot serve as the master node in dual connectivity and cannot serve as the only wireless access network node to which the terminal is connected.
  • the first network element and the second network element are a first radio access network node and a second radio access network node, respectively;
  • the processor 1001 is specifically configured to:
  • At least one cell has corresponding indication information, and the indication information is used to indicate at least one of the following:
  • the corresponding cell can be designated as the primary cell
  • the corresponding cell can be used as a special cell in the cell group
  • the corresponding cell cannot be designated as the primary cell
  • the corresponding cell cannot be used as a special cell in the cell group.
  • the first network element and the second network element are a first radio access network node and a second radio access network node, respectively;
  • the processor 1001 is specifically configured to:
  • the first radio access network node can only be used as a secondary node in dual connectivity, or the secondary cell group SCG can be configured in the first radio access network node but the primary cell group MCG cannot be configured, or the first radio All the cells under the jurisdiction of the access network node cannot be designated as the primary cell;
  • the first radio access network node can be used as the master node in dual connectivity or the only radio access network node to which the terminal is connected, or the first radio access network node can be configured with a primary cell group MCG, or At least one cell among all the cells under the jurisdiction of the first radio access network node may be designated as the primary cell.
  • the first network element is a distributed unit in a distributed radio access network node
  • the second network element is a centralized unit in the distributed radio access network node
  • the processor 1001 is specifically configured to:
  • the centralized unit which carries a cell list of all or part of the cells under the jurisdiction of the distribution unit, and at least There is corresponding indication information for a cell, and the indication information is used to indicate at least one of the following:
  • the corresponding cell can be designated as the primary cell
  • the corresponding cell can be used as a special cell in the cell group
  • the corresponding cell cannot be designated as the primary cell
  • the corresponding cell cannot be used as a special cell in the cell group.
  • the first network element is a distributed unit in a distributed radio access network node
  • the second network element is a centralized unit in the distributed radio access network node
  • the processor 1001 is specifically configured to:
  • only the secondary cell group SCG can be configured in the distribution unit, or all cells under the jurisdiction of the distribution unit cannot be designated as primary cells;
  • a primary cell group MCG can be configured in the distribution unit, or at least one cell among all the cells under the jurisdiction of the distribution unit can be designated as a primary cell.
  • the first network element and the second network element are a first radio access network node and a second radio access network node, respectively;
  • the processor 1001 is specifically configured to:
  • the first network element is a distributed unit in a distributed radio access network node
  • the second network element is a centralized unit in the distributed radio access network node
  • the processor 1001 is specifically configured to:
  • a failure message is sent to the centralized unit, which carries indication information used to indicate that the target cell cannot be designated as a primary cell or as a special cell in a cell group.
  • the embodiments of the present application also provide a computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are used to make a computer execute the method executed by the network device in the foregoing embodiment.
  • this application can be provided as methods, systems, or computer program products. Therefore, this application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, this application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing equipment to work in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture including the instruction device.
  • the device implements the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.
  • These computer program instructions can also be loaded on a computer or other programmable data processing equipment, so that a series of operation steps are executed on the computer or other programmable equipment to produce computer-implemented processing, so as to execute on the computer or other programmable equipment.
  • the instructions provide steps for implementing the functions specified in one process or multiple processes in the flowchart and/or one block or multiple blocks in the block diagram.

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Abstract

本申请公开了一种无线接入模式指示方法及装置。本申请中，无线接入网中的第一网元确定所述第一网元相关的无线接入模式，并向无线接入网中的第二网元发送第一消息，其中携带所述第一网元相关的无线接入模式的指示信息。其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式。第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：第一网元下的至少一个小区可被或不可被指定为主小区；第一网元可配置或不可配置主小区组；第一网元能够作为或不能够作为双连接中的主节点，或者能够作为或不能作为终端所唯一连接的无线接入网节点。

Description

一种无线接入模式指示方法及装置
相关申请的交叉引用
本申请要求在2020年04月08日提交中国专利局、申请号为202010270459.9、申请名称为“一种无线接入模式指示方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及无线通信技术领域，尤其涉及一种无线接入模式指示方法及装置。
背景技术
在无线通信领域，为了支持多种多样的业务需求，业界引入了诸如载波聚合(Carrier Aggregation，CA)、双连接(Dual Connectivity，DC)等技术，以支持一个终端同时连接到多个无线接入小区，进而有针对性地根据业务需求使用不同小区来进行传输。当终端与网络连接时，无论其是否使用了CA或DC等技术，网络均会为其指定一个(且仅有一个)小区为该无线连接的主小区(Primary Cell，PCell)。
5G无线接入网(New generation-Radio Access Network，NG-RAN)允许使用演进的全局地面无线接入(Evolved Universal Terrestrial Radio Access，E-UTRA)与新空口(New Radio，NR)这两大类无线接入技术。无线接入小区的类型进一步多样化，进一步凸显了CA与DC的重要性。有鉴于此，业界认为在无线接入网之中，有些小区可以仅支持非独立模式，亦即不能被指定为PCell。同时，进一步地，一个无线接入网节点之中所有小区可以均仅支持非独立模式，这也就意味着该无线接入网节点仅能作为辅节点为终端提供服务。无线接入网网元可能会错误地触发以这些小区为目标小区(亦即切换后的PCell)的切换过程，造成切换失败。
发明内容
本申请实施例提供一种无线接入模式指示方法及装置，用以实现无线接入网网元之间进行无线接入模式的指示，进而避免因目标小区仅支持非独立模式而导致的切换失败。
第一方面，提供一种无线接入模式指示方法，包括：
无线接入网中的第一网元确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
无线接入网中第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息；
其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
所述第一网元下的至少一个小区可被指定为主小区；
所述第一网元下的至少一个小区不可被指定为主小区；
所述第一网元可配置主小区组；
所述第一网元不可配置主小区组；
所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点。
可选地，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
所述第一无线接入网节点向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示 信息，所述指示信息用于指示以下内容中的至少一个：
相应的小区可被指定为主小区；
相应的小区能够作为小区组内的特殊小区；
相应的小区不可被指定为主小区；
相应的小区不能作为小区组内的特殊小区。
可选地，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
所述第一无线接入网节点向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
所述第一无线接入网节点仅能作为双连接中的辅节点，或者所述第一无线接入网节点内能配置SCG但不能配置MCG，或者所述第一无线接入网节点所辖的所有小区均不可被指定为主小区；
所述第一无线接入网节点能作为双连接中的主节点或作为终端所连接的唯一的无线接入网节点，或者所述第一无线接入网节点内能配置MCG，或者所述第一无线接入网节点所辖的所有小区中至少一个小区可被指定为主小区。
可选地，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
所述分布单元向所述集中单元发送通信接口建立请求消息或所述分布单元的配置更新消息或配置更新确认消息，其中携带所述分布单元所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
相应的小区可被指定为主小区；
相应的小区能够作为小区组内的特殊小区；
相应的小区不可被指定为主小区；
相应的小区不能作为小区组内的特殊小区。
可选地，还包括：所述集中单元向无线接入网节点发送第三消息，其中携带所述小区列表以及所述指示信息。
可选地，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
所述分布单元向所述集中单元发送通信接口建立请求消息或节点配置更新消息或配置更新确认消息，其中携带所述分布单元的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
所述分布单元内仅能配置SCG，或者所述分布单元所辖的所有小区均不可被指定为主小区；
所述分布单元内能配置MCG，或者所述分布单元所辖的所有小区中有至少一个小区可被指定为主小区。
可选地，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
所述第一无线接入网节点接收所述第二无线接入网节点发送的切换请求消息；
所述第一无线接入网节点向所述第二无线接入网节点发送切换准备失败消息，其中携带用于指示切换目标小区不可被指定为主小区或不能作为小区组中的特殊小区的指示信息。
可选地，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；所述无线接入网中的第 一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
所述分布单元接收所述集中单元发送的终端上下文建立请求消息或终端上下文修改请求消息，其中携带目标小区的标识；
所述分布单元向所述集中单元发送失败消息，其中携带用于指示所述目标小区不可被指定为主小区或作为小区组中的特殊小区的指示信息。
第二方面，提供一种网络设备，所述网络设备为无线接入网中的第一网元，该网络设备包括：处理器、存储器、收发机；
所述收发机，在处理器的控制下进行数据的接收和发送；
所述存储器，存储计算机指令；
所述处理器，用于读取所述计算机指令，执行如上述第一方面中任一项所述的方法。
第三方面，提供一种无线接入模式指示装置，包括：
处理模块，用于确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
发送模块，用于向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息；
其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
所述第一网元下的至少一个小区可被指定为主小区；
所述第一网元下的至少一个小区不可被指定为主小区；
所述第一网元可配置主小区组；
所述第一网元不可配置主小区组；
所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一 连接的无线接入网节点。
第四方面，提供一种计算机可读存储介质，所述计算机可读存储介质存储有计算机可执行指令，所述计算机可执行指令用于使所述计算机执行如上述第一方面中任一项所述的方法。
本申请的上述实施例中，无线接入网中的第一网元将第一网元下的至少一个小区的无线接入模式或者第一网元的无线接入模式，发送给无线接入网中的第二网元，使得无线接入网的网元之间可以交互指示信息，以指示所辖小区是否可以被指定为PCell，从而避免小区切换时将不能被指定为PCell的小区作为目标切换小区，进而降低无线接入网之中的切换失败概率。
附图说明
为了更清楚地说明本申请实施例的技术方案，下面将对本申请实施例中所需要使用的附图作简单地介绍，显而易见地，下面所介绍的附图仅仅是本申请的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1示例性示出了CU/DU分离的RAN示意图；
图2示例性示出了本申请实施例提供的接入模式指示流程示意图；
图3示例性示出了本申请中示例一的流程示意图；
图4示例性示出了本申请中示例二的流程示意图；
图5示例性示出了本申请中示例三的流程示意图；
图6示例性示出了本申请中示例四的流程示意图；
图7示例性示出了本申请中示例五的流程示意图；
图8示例性示出了本申请中示例六的流程示意图；
图9示例性示出了本申请实施例中的网元设备的结构示意图；
图10示例性示出了本申请中另外的网元设备的结构示意图。
具体实施方式
为了使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请作进一步地详细描述，显然，所描述的实施例仅仅是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其它实施例，都属于本申请保护的范围。
以下对本申请实施例中的部分用语进行解释说明，以便于本领域技术人员理解。
(1)本申请实施例中，名词“网络”和“系统”经常交替使用，但本领域的技术人员可以理解其含义。
(2)本申请实施例中术语“多个”是指两个或两个以上，其它量词与之类似。
(3)“和/或”，描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。字符“/”一般表示前后关联对象是一种“或”的关系。
(4)网络设备，是一种为终端提供无线通信功能的设备，包括但不限于：5G中的gNB、无线网络控制器(radio network controller，RNC)、节点B(node B，NB)、基站控制器(base station controller，BSC)、基站收发台(base transceiver station，BTS)、家庭基站(例如，home evolved nodeB，或home node B，HNB)、基带单元(BaseBand Unit，BBU)、传输点(transmitting and receiving point，TRP)、发射点((transmitting point，TP)、移动交换中心等。本申请中的基站还可以是未来可能出现的其他通信系统中为终端提供无线通信功能的设备。
(5)终端，是一种可以向用户提供语音和/或数据连通性的设备。例如，终端设备包括具有无线连接功能的手持式设备、车载设备等。目前，终端设备可以是：手机(mobile phone)、平板电脑、笔记本电脑、掌上电脑、移动互联网设备(mobile internet device，MID)、可穿戴设备，虚拟现实(virtual reality，VR)设备、增强现实(augmented reality，AR)设备、工业控制(industrial control) 中的无线终端、无人驾驶(self-driving)中的无线终端、智能电网(smart grid)中的无线终端、运输安全(transportation safety)中的无线终端、智慧城市(smart city)中的无线终端，或智慧家庭(smart home)中的无线终端等。
按照目前的5G技术，无线接入网网元之间需要交互各自所控制的小区的相关信息，所交互的小区相关信息中不包含该小区是否能够被指定为PCell的指示信息。这也就意味着如果没有运营方的手动控制，其他无线接入网网元可能会错误地触发以这些小区为目标小区(亦即切换后的PCell)的切换过程，造成切换失败。
有鉴于此，本申请实施例提出一种无线接入模式的指示方法，使得无线接入网网元之间可以交互一种指示信息，用于指示各自所控制的小区是否可以被指定为PCell，进而降低无线接入网之中的切换失败概率。
下面结合附图对本申请实施例进行详细说明。
本申请实施例可适用于采用载波聚合或双连接技术的无线接入网，也可适用于基于集中单元(Centralized Unit，CU)/分布单元(Distributed Unit，DU)分离的无线接入网(RAN)。
在描述本申请实施例之前，首先对载波聚合、双连接以及CU/DU分离的RAN进行说明。
(1)载波聚合与双连接。
载波聚合(Carrier Aggregation，CA)与双连接(Dual Connectivity，DC)均为使一个终端通过多个无线接入小区接入的技术。这两种技术允许网络与一个终端不仅可以使用一个小区(PCell)交互数据，还可以通过其他小区(PSCell或SCell)交互数据。如果终端与网络仅通过一个小区连接，那么该小区称作PCell。
具体地，网络与终端之间可以通过一对或多对媒体接入控制(Media Access Control instance，MAC)实例相互交互MAC协议数据单元(Protocol Data Unit，PDU)。如果网络与终端仅使用一对MAC实例进行MAC PDU交互，那么网络与终端之间的连接称作“单连接”。如果网络与终端使用了两对 MAC实例进行MAC PDU交互，那么网络与终端之间的连接称作“双连接”，也就是DC。
对于每一对MAC实例，其所交互的MAC PDU可以通过多个小区传输。一对MAC实例所使用的所有小区统称为一个小区组(Cell Group)。每一个网络与终端之间的连接均有且仅有一个主小区组(Master Cell Group，MCG)，同时也可以有一个辅小区组(Secondary Cell Group，SCG)。仅存在MCG的场景即为单连接，既存在MCG又存在SCG的场景即为双连接。
如果MCG与SCG由不同的无线接入网(Radio Access Network Node，RAN)节点所控制，那么控制MCG的RAN节点称作主节点(Master Node，MN)，控制SCG的RAN节点称作辅节点(Secondary Node，SN)。
进一步地，5G系统内的小区分为E-UTRA与NR两类。每一个小区组内部的所有小区均为E-UTRA小区，或者均为NR小区。MCG中的小区均为E-UTRA小区，并且SCG中的小区均为NR小区的双连接模式称作NGEN-DC(NG-RAN E-UTRA-NR DC)，MCG与SCG中的小区均为NR小区的双连接模式称作NR-DC(NR-NR DC)。
在每一个小区组内部，其中均有且仅有一个小区称作SpCell(特殊小区)，其他小区(若存在)称作SCell。其中，MCG内的SpCell又称作PCell，SCG内的SpCell又称作PSCell。
在实际运行过程中，一个连接以哪一个小区为PCell取决于两种途径：当终端从非连接态进入连接态时，其所驻留(camp)的小区自动作为PCell。另一方面，当用户终端进入连接态之后，网络侧也可以发起切换以变更PCell。具体地，切换的发起方会指定一个(在部分场景中也可以是多个候选的)切换的目标小区(target cell)，当切换完成时，切换的目标小区会自动作为新的PCell。切换的目标小区所属的无线接入网节点称为切换的目标节点。
在空口上，网络可以通过某一个小区的系统消息广播告知终端该小区不能驻留，进而使得终端不会通过从非连接态进入连接态这一过程使该小区成为PCell。但是，在网络设备间的接口上，无线接入网网元之间并不交互某一 个小区是否能够作为PCell的信息。
这个问题对于NR小区尤为突出。NR小区的频点分为频率范围1(Frequency Range 1，FR1)与FR2两类。在实际部署中，FR1小区的频点通常位于2～5GHz，而FR2小区的频点通常位于数十GHz，两者差异很大。FR1小区通常覆盖范围较大且较为稳定，但带宽较窄，比较适合提供基础覆盖，适合作为PCell提供服务；而FR2小区通常覆盖范围较小且较为不稳定，但带宽较大，比较适合作为热点带宽增强，用作PCell则很容易由于信号不稳定而造成大量无线资源控制(Radio Resource Control，RRC)连接失败的情况，想要克服这些问题则需要软硬件方面的大量优化增强，复杂度较高，使得成本也较高。有鉴于此，业界认为很多FR2小区可以直接设计为仅提供带宽增强功能，不能作为PCell。这些小区与能够作为PCell的FR2小区有区分对待的实际需求。
(2)CU/DU分离架构。
为了因应复杂多变的实际部署场景以及节省部署成本，业界提出了gNB-CU/DU分离架构。图1示例性示出了一种CU/DU分离架构。
如图1所示，在这个架构下，连接至5GC(5G Core Network，5G核心网)的NR节点，亦即gNB，进一步分离为gNB-CU与gNB-DU两部分。其中，gNB-CU通过Xn接口与其他RAN节点连接，通过NG接口与5GC连接；gNB-DU则通过空口与终端(UE)连接，并且负责小区的维护，例如发送系统消息广播。gNB-CU与gNB-DU之间通过F1接口相连。
gNB-DU可以通过F1接口告知gNB-CU其所控制的小区的相关信息，其中包括小区ID等。
切换的目标小区由gNB-CU指定。具体地，源RAN节点会选择一个目标小区。如果切换相关信令基于Xn接口传输，则源RAN节点还可以指定多个候选的目标小区。如果源RAN节点是一个CU/DU分离式gNB，那么这个目标小区以及可能存在的候选的目标小区由源gNB-CU决定。如果切换的目标RAN节点是一个CU/DU分离式gNB，并且源节点指定了多个候选的目标小 区，那么目标gNB-CU会根据测量报告等信息确定目标小区，并通过F1接口请求gNB-DU生成终端的小区组配置，其中以该目标小区为PCell。gNB-DU可以拒绝这一请求，并告知gNB-CU它所选择的目标小区并不适合作为PCell，此时如果可行，gNB-CU可以选择其他小区作为目标小区。gNB-DU不会提供gNB-DU作出这一判决的具体原因。
在切换过程中，如果目标小区属于一个gNB-DU，那么该gNB-DU称作目标gNB-DU。
图2示例性示出了本申请实施例提供的接入模式指示方法的流程示意图。该流程描述了无线接入网中的第一网元向第二网元指示接入模式的过程。在一些应用场景中，无线接入网中的第一网元和第二网元分别为两个不同的RAN节点，称为第一RAN节点和第二RAN节点；在另一些实施例中，无线接入网中的第一网元和第二网元为CU/DU分离的分布式RAN节点(gNB)中的DU和CU，即第一网元为gNB中的DU，第二网元为gNB中的CU。
如图所示，该流程可包括：
S201：第一网元确定该第一网元相关的无线接入模式。
第一网元相关的无线接入模式可包括：第一网元下的至少一个小区的无线接入模式，或者第一网元的无线接入模式。其中，“无线接入模式”也可称为“无线接入能力”，本申请实施例对于该命名不做限制。
一个小区的无线接入模式可用于指示该小区是否可被指定为PCell。具体而言，一个小区的无线接入模式可包括独立模式和非独立模式，独立模式是指该小区能够被指定为PCell，非独立模式是指该小区不能被指定为PCell。
一个网元的无线接入模式可用于指示该网元所辖的所有小区是否可被指定为PCell。具体而言，一个网元的无线接入模式可包括独立模式和非独立模式，独立模式是指该网元所辖的所有小区均可被指定为PCell，非独立模式是指该网元所辖的所有小区均不可被指定为PCell。如果一个网元所辖的所有小区均不可被指定为PCell，则该网元的无线接入模式也意味着：该网元不可配置主小区组，并且该网元不能够作为双连接中的主节点并且不能够作为终端 所唯一连接的无线接入网节点。
在一些应用场景中，由于FR1小区通常覆盖范围较大且较为稳定，但带宽较窄，比较适合提供基础覆盖，适合作为PCell提供服务，而FR2小区通常覆盖范围较小且较为不稳定，但带宽较大，比较适合作为热点带宽增强，因此，可以使得FR1小区的无线接入模式为独立模式，即FR1小区可被指定为PCell，使得FR2小区的无线接入模式为非独立模式，即FR2小区不可被指定为PCell。
当然，也可以根据网络配置或者其他情况，决定哪个或哪些小区不可被指定为PCell，本申请实施例对此不做限制。
一个小区的无线接入模式(如该小区是否可被指定为PCell)，或者一个网元的无线接入模式(如该网元所辖的所有小区是否可被指定为PCell)，可根据预先设置的配置信息获得，也可以根据预先配置的规则来确定，比如若一个小区为FR2小区，则该小区不可被指定为PCell，本申请实施例对此不做限制。
S202：第一网元向无线接入网中的第二网元发送第一消息，其中携带第一网元相关的无线接入模式的指示信息。
在一些实施例中，若S201中，第一网元确定第一网元下的至少一个小区的无线接入模式，并在S202中发送相应的指示信息，则第二网元可根据该指示信息获知所述至少一个小区是否可被指定为PCell，进而对于不可被指定为PCell的小区，在发起切换时不会选择相应的小区为切换的目标小区。若S201中，第一网元确定第一网元的无线接入模式，并在S202中发送相应的指示信息，则第二网元可根据该指示信息获知该第一网元下的所有小区是否可被指定为PCell，进而对于不可被指定为PCell的小区，在发起切换时不会选择相应的小区为切换的目标小区，或者说，对于所辖的所有小区均不可被指定为PCell的网元，在发起切换时不会选择该网元为切换的目标网元。
可选地，基于上述图2所示的接入模式指示方法的流程，还可以包括以下步骤：
第二网元在接收到第一网元发送的第一消息后，可向第一网元发送第二消息，所述第二消息携带第二网元相关的无线接入模式的指示信息，从而使得第一网元可获知第二网元所辖的小区的无线接入模式，进而对于不可被指定为PCell的小区，在发起切换时不会选择相应的小区为切换的目标小区。如果第二网元所辖的所有小区均不可被指定为PCell，则第二网元在发起切换时不会选择第一网元作为切换目标网元。
可选地，基于上述流程，在一些实施例中，第一网元相关的无线接入模式的指示信息，可以用于指示以下内容中的至少一个：
(1)第一网元下的至少一个小区可被指定为主小区。比如，第一网元可向第二网元发送一个或多个小区的标识(或者其他用于识别一个小区的信息)以及对应的指示信息，该指示信息用于指示对应的小区可被指定为主小区，即具有作为主小区的能力。
(2)第一网元下的至少一个小区不可被指定为主小区。比如，第一网元可向第二网元发送一个或多个小区的标识(或者其他用于识别一个小区的信息)以及对应的指示信息，该指示信息用于指示对应的小区不可被指定为主小区，即不具有作为主小区的能力。
(3)第一网元可配置主小区组。比如，第一网元可向第二网元发送一个指示信息，该指示信息用于指示第一网元可配置MCG，即第一网元具有配置主小区组的能力。
(4)第一网元不可配置主小区组。比如，第一网元可向第二网元发送一个指示信息，该指示信息用于指示第一网元不可配置MCG，即第一网元不具有配置主小区组的能力。
(5)第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点。比如，第一网元可向第二网元发送一个指示信息，该指示信息用于指示第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点，即第一网元具有作为双连接之中的主节点或者终端所唯一连接的无线接入网节点的能力。
(6)第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点。比如，第一网元可向第二网元发送一个指示信息，该指示信息用于指示第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点，即第一网元不具有作为双连接之中的主节点并且作为终端所唯一连接的无线接入网节点的能力。
可选地，基于上述流程，在一些实施例中，第二网元相关的无线接入模式的指示信息，可以用于指示以下内容中的至少一个：
第二网元下的至少一个小区可被指定为主小区；
第二网元下的至少一个小区不可被指定为主小区；
第二网元可配置主小区组；
第二网元不可配置主小区组；
第二网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
第二网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点。
根据上述图2所示的流程，无线接入网中的第一网元将第一网元下的至少一个小区的无线接入模式或者第一网元的无线接入模式，发送给无线接入网中的第二网元，使得无线接入网的网元之间可以交互指示信息，以指示所辖小区是否可以被指定为PCell，从而避免小区切换时将不能被指定为PCell的小区作为目标切换小区，进而降低无线接入网之中的切换失败概率。
可选地，本申请的一些实施例中，可以在与终端无关的接口通信连接建立流程中，或者在与终端无关的信息配置流程中，或者在与终端相关的切换流程中，交互上述指示信息。
下面以几个具体示例对本申请的上述实施例进行说明。
示例一
参考图3，本示例中，RAN节点1作为第一网元，在Xn接口通过与终端无关的消息，向作为第二网元的RAN节点2指示一个或多个小区不能作为 PCell。
如图所示，该流程可包括：
301：RAN节点1向RAN节点2发送Xn建立请求消息或NG-RAN节点配置更新消息，其中包含RAN节点1所辖的小区列表(该列表可包含RAN节点1所辖的全部小区或部分小区)，该小区列表中，针对其中的至少一个小区，包含该小区是否能够被指定为PCell的指示信息。
具体地，一个小区的上述指示信息可至少用于指示以下内容中的至少一个：
(1)用于指示相应的小区可被指定为PCell，即指示相应的小区能够作为PCell；
(2)用于指示相应的小区能够作为小区组内的SpCell；比如，该指示信息可指示相应的小区可作为MCG中的PCell，或者指示相应的小区可作为SGC中的PSCell；
(3)用于指示相应的小区不可被指定为PCell，即指示相应的小区不能作为PCell；
(4)用于指示相应的小区不能作为小区组内的SpCell；比如，该指示信息可指示相应的小区不可作为MCG中的PCell，或者指示相应的小区不可作为SCG中的PSCell。
RAN节点2在接收到这消息后，可以根据该指示信息获知RAN节点1之中的哪个或哪些小区不能作为PCell，进而在发起切换时不会选择相应小区为切换的目标小区。
302：RAN节点2向RAN节点1发送相应的响应消息。
该步骤中，如果301中所发送的消息是Xn建立请求消息，则302中发送的消息为Xn建立响应消息；如果301中发送的消息是NG-RAN节点配置更新消息，则在302中发送的消息为NG-RAN节点配置更新确认消息。
可选地，该响应消息中可包含RAN节点2所辖的小区列表(该列表可包含RAN节点1所辖的全部小区或部分小区)，该小区列表中，针对其中的至 少一个小区，包含该小区是否能够被指定为PCell的指示信息。RAN节点1在接收到该响应消息后，可以根据该指示信息获知RAN节点2之中的哪个或哪些小区不能作为PCell，进而在发起切换时不会选择相应的小区为切换的目标小区。
示例二
参考图4，本示例中，RAN节点1作为第一网元，在Xn接口通过与终端无关的消息，向作为第二网元的RAN节点2指示该RAN节点1是否仅能作为辅节点。
如图所示，该流程可包括：
401：RAN节点1向RAN节点2发送Xn建立请求消息或者NG-RAN节点配置更新消息，其中包含RAN节点1是否仅能作为双连接(DC)之中的辅节点的指示信息。等价地，该指示信息也可以是RAN节点1之中是否仅能配置SCG的指示信息。
具体地，该指示信息可以指示以下内容中的至少一个：
(1)RAN节点1仅能作为DC之中的辅节点为终端提供服务。等价地，该指示信息也可以用于指示RAN节点1内仅能配置SCG，不能配置MCG。等价地，该指示信息也可用于指示RAN节点1所辖的所有小区均不能作为PCell；
(2)RAN节点1可以作为DC之中的主节点或作为终端所连接的唯一的无线接入网节点。等价地，该指示信息也可用于指示RAN节点1内可以配置MCG。等价地，该指示信息也可用于指示RAN节点1所辖的所有小区之中，有至少一个小区能够作为PCell。
RAN节点2在接收该消息后，可以根据该指示信息获知RAN节点1内是否可以配置MCG。如果该指示信息表明RAN节点1内不能配置MCG，只能配置SCG，则RAN节点2在发起切换时不会选择RAN节点1为切换的目标节点。
402：RAN节点2向RAN节点1发送相应的响应消息。
该步骤中，如果401中所发送的消息是Xn建立请求消息，则402中发送的消息为Xn建立响应消息；如果401中发送的消息是NG-RAN节点配置更新消息，则在402中发送的消息为NG-RAN节点配置更新确认消息。
可选地，该响应消息中可包含RAN节点2是否仅能作为双连接(DC)之中的辅节点的指示信息。等价地，该指示信息也可以是RAN节点2之中是否仅能配置SCG的指示信息。RAN节点1在接收到该响应消息后，可以根据该指示信息获知RAN节点2之中是否可配置MCG。如果该指示信息表明RAN节点2之中不能配置MCG，只能配置SCG，则RAN节点1在发起切换时不会选择RAN节点2为切换的目标节点。
示例三
参考图5，本示例中，gNB中的DU(gNB-DU)作为第一网元，在F1接口通过与终端无关的消息，向作为第二网元的gNB中的CU(gNB-CU)指示一个或多个小区不能作为PCell。
如图所示，该流程可包括：
501：gNB-DU向gNB-CU发送F1建立请求消息或者gNB-DU配置更新消息或者gNB-CU配置更新确认消息，其中包含gNB-DU所辖的小区列表(该列表可包含RAN节点1所辖的全部小区或部分小区)，该小区列表中，针对其中的至少一个小区，包含该小区是否能够被指定为PCell的指示信息。
具体地，这个指示信息至少能够用于指示以下四点之中的任意一点：
(1)用于指示相应的小区可被指定为PCell；
(2)用于指示相应的小区能够作为小区组内的SpCell，比如，该指示信息可指示相应的小区可作为MCG中的PCell，或者指示相应的小区可作为SCG中的PSCell；
(3)用于指示相应的小区不可被指定为PCell；
(4)用于指示相应的小区不能作为小区组内的SpCell，比如，该指示信息可指示相应的小区不可作为MCG中的PCell，或者指示相应的小区不可作为SCG中的PSCell。
gNB-CU在接收到该消息后，可以根据该指示信息获知gNB-DU之中的哪个或哪些小区不能作为PCell，进而在发起切换时不会选择相应小区为切换的目标小区。
进一步地，该流程还可包括以下步骤：
502：gNB-CU代表该gNB，向其他RAN节点发送Xn接口消息，其中包含它从gNB-DU所收到的小区列表以及上述指示信息。
所述其他RAN节点接收到这消息后，可以根据该指示信息获知该小区列表中的哪个或哪些小区不能作为PCell，进而在发起切换时不会选择相应小区为切换的目标小区。
示例四
参考图6，本示例中，gNB中的DU(gNB-DU)作为第一网元，在F1接口通过与终端无关的消息，向作为第二网元的gNB中的CU(gNB-CU)指示gNB-DU之中是否能够配置MCG。
如图所示，该流程可包括：
601：gNB-DU向gNB-CU发送F1建立请求消息或者gNB-DU配置更新消息或者gNB-CU配置更新确认消息，其中包含该gNB-DU之中是否仅能配置SCG、不能配置MCG的指示信息。
具体地，该指示信息能够指示以下内容中的至少一个：
(1)该gNB-DU之中仅能配置SCG、不能配置MCG。等价地，该指示信息也可用于指示该gNB-DU所辖的所有小区均不能作为PCell；
(2)该gNB-DU之中可以配置MCG。等价地，该指示信息也可用于指示该gNB-DU所辖的所有小区之中，有至少一个小区能够作为PCell。
该gNB-CU在接收到该消息后，可以根据该指示信息获知该gNB-DU之中是否可以配置MCG。如果该指示信息表明该gNB-DU之中不能配置MCG、只能配置SCG，则该gNB-CU在发起切换时不会选择该gNB-DU为切换的目标gNB-DU。
示例五
参考图7，本示例中，RAN节点2作为第一网元，在Xn接口通过与终端相关的消息，向作为第二网元的RAN节点1指示一个小区能作为PCell。
如图所示，该流程可包括：
701：针对某个终端，RAN节点1向RAN节点2发送切换请求消息，其中指定了切换的目标小区。
702：RAN节点2向RAN节点1发送切换准备失败消息，其中包含一个原因值，该原因值能够指示本次切换失败的原因在于所指定的目标小区不能作为PCell。
具体地，该原因值可以直接用于指示所指定的目标小区不能作为PCell，也可以用于指示所指定的目标小区不能作为SpCell。
RAN节点1在接收到这条消息后，可以根据该原因值获知该小区不能作为PCell，进而在之后的切换中不会再选择该小区为切换的目标小区。
需要说明的是，该示例虽然是用切换失败的原因值来指示所指定的目标小区不能作为SpCell，但本申请的其他实施例中，不排除使用其他指示信息或者自定义的指示信息来指示上述内容。
示例六
参考图8，本示例中，gNB中的DU(gNB-DU)作为第一网元，在F1接口通过与终端相关的消息，向作为第二网元的gNB中的CU(gNB-CU)指示一个小区不能作为PCell。
如图所示，该流程可包括：
801：针对某个终端，gNB-CU向gNB-DU发送终端上下文建立请求消息或者终端上下文修改请求消息，其中指定了一个目标小区(比如携带该目标小区的标识)，该目标小区在该过程结束后应当作为SpCell。
802：gNB-DU向gNB-CU发送相应的失败消息。
该步骤中，如果在801中所发送的消息为终端上下文建立请求消息，则在802中发送的失败消息为终端上下文建立失败消息；如果在801中所发送的消息为终端上下文修改请求消息，则在802中发送的失败消息为终端上下 文修改失败消息。
该失败消息中包含一个原因值，该原因值能够指示本次切换失败的原因在于所指定的小区不能作为PCell。具体地，该原因值可以直接用于指示所指定的小区不能作为PCell，也可以用于指示所指定的小区不能作为SpCell。
RAN节点1在接收到该失败消息后，可以根据该原因值获知该小区不能作为PCell，进而在之后的切换中不会选择该小区为切换的目标小区。
基于相同的技术构思，本申请实施例还提供了一种网元设备，可实现前述实施例中网元设备侧的功能。
图9示例性示出了本申请实施例中的无线接入模式指示装置的结构，该无线接入模式指示装置可以为无线接入网中的第一网元，该第一网元可以是RAN节点，也可以是分布式RAN节点中的分布单元(gNB-DU)，如图所示，该网无线接入模式指示装置可包括：处理模块901、发送模块902和接收模块903。
处理模块901，用于确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
发送模块902，用于向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息。
其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
所述第一网元下的至少一个小区可被指定为主小区；
所述第一网元下的至少一个小区不可被指定为主小区；
所述第一网元可配置主小区组；
所述第一网元不可配置主小区组；
所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一 连接的无线接入网节点。
可选地，所述第一网元和所述第二网元分别为第一RAN节点和第二RAN节点。相应的，发送模块902可具体用于：向所述第二RAN节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一RAN节点所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
相应的小区可被指定为主小区；
相应的小区能够作为小区组内的特殊小区；
相应的小区不可被指定为主小区；
相应的小区不能作为小区组内的特殊小区。
可选地，所述第一网元和所述第二网元分别为第一RAN节点和第二RAN节点。相应的，发送模块902具体用于：向所述第二RAN节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一RAN节点的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
所述第一RAN节点仅能作为双连接中的辅节点，或者所述第一无线接入网节点内能配置SCG但不能配置MCG，或者所述第一RAN节点所辖的所有小区均不可被指定为主小区；
所述第一RAN节点能作为双连接中的主节点或作为终端所连接的唯一的无线接入网节点，或者所述第一RAN节点内能配置MCG，或者所述第一RAN节点所辖的所有小区中至少一个小区可被指定为主小区。
可选地，所述第一网元为分布式RAN节点中的分布单元，所述第二网元为所述分布式RAN节点中的集中单元。相应的，发送模块902具体用于：向所述集中单元发送通信接口建立请求消息或所述分布单元的配置更新消息或配置更新确认消息，其中携带所述分布单元所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
相应的小区可被指定为主小区；
相应的小区能够作为小区组内的特殊小区；
相应的小区不可被指定为主小区；
相应的小区不能作为小区组内的特殊小区。
可选地，所述第一网元为分布式RAN节点中的分布单元，所述第二网元为所述分布式RAN节点中的集中单元。相应的，发送模块902具体用于：向所述集中单元发送通信接口建立请求消息或节点配置更新消息或配置更新确认消息，其中携带所述分布单元的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
所述分布单元内仅能配置SCG，或者所述分布单元所辖的所有小区均不可被指定为主小区；
所述分布单元内能配置MCG，或者所述分布单元所辖的所有小区中有至少一个小区可被指定为主小区。
可选地，所述第一网元和所述第二网元分别为第一RAN节点和第二RAN节点。相应的，接收模块903具体用于：接收所述第二RAN节点发送的切换请求消息；发送模块902具体用于：向所述第二RAN节点发送切换准备失败消息，其中携带用于指示切换目标小区不可被指定为主小区或不能作为小区组中的特殊小区的指示信息。
可选地，所述第一网元为分布式RAN节点中的分布单元，所述第二网元为所述分布式RAN节点中的集中单元。相应的，接收模块903具体用于：接收所述集中单元发送的终端上下文建立请求消息或终端上下文修改请求消息，其中携带目标小区的标识；发送模块902具体用于：向所述集中单元发送失败消息，其中携带用于指示所述目标小区不可被指定为主小区或作为小区组中的特殊小区的指示信息。
在此需要说明的是，本申请实施例提供的上述网络设备，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
基于相同的技术构思，本申请实施例还提供了一种网络设备，可实现前 述实施例中第一网元侧的功能。
图10示例性示出了本申请实施例中的网络设备的结构示意图。如图10所示，该网络设备可包括：处理器1001、存储器1002、收发机1003以及总线接口1004。
处理器1001负责管理总线架构和通常的处理，存储器1002可以存储处理器1001在执行操作时所使用的数据。收发机1003用于在处理器1001的控制下接收和发送数据。
总线架构可以包括任意数量的互联的总线和桥，具体由处理器1001代表的一个或多个处理器和存储器1002代表的存储器的各种电路链接在一起。总线架构还可以将诸如外围设备、稳压器和功率管理电路等之类的各种其他电路链接在一起，这些都是本领域所公知的，因此，本文不再对其进行进一步描述。总线接口提供接口。处理器1001负责管理总线架构和通常的处理，存储器1002可以存储处理器1001在执行操作时所使用的数据。
本申请实施例揭示的流程，可以应用于处理器1001中，或者由处理器1001实现。在实现过程中，信号处理流程的各步骤可以通过处理器1001中的硬件的集成逻辑电路或者软件形式的指令完成。处理器1001可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件处理器执行完成，或者用处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器，闪存、只读存储器，可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器1002，处理器1001读取存储器1002中的信息，结合其硬件完成信号处理流程的步骤。
具体地，处理器1001可以读取存储器1002中的计算机指令，执行以下操作：
确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无 线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息；其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
所述第一网元下的至少一个小区可被指定为主小区；
所述第一网元下的至少一个小区不可被指定为主小区；
所述第一网元可配置主小区组；
所述第一网元不可配置主小区组；
所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点。
可选地，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
所述处理器1001具体用于：
向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
相应的小区可被指定为主小区；
相应的小区能够作为小区组内的特殊小区；
相应的小区不可被指定为主小区；
相应的小区不能作为小区组内的特殊小区。
可选地，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
所述处理器1001具体用于：
向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
所述第一无线接入网节点仅能作为双连接中的辅节点，或者所述第一无线接入网节点内能配置辅小区组SCG但不能配置主小区组MCG，或者所述第一无线接入网节点所辖的所有小区均不可被指定为主小区；
所述第一无线接入网节点能作为双连接中的主节点或作为终端所连接的唯一的无线接入网节点，或者所述第一无线接入网节点内能配置主小区组MCG，或者所述第一无线接入网节点所辖的所有小区中至少一个小区可被指定为主小区。
可选地，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
所述处理器1001具体用于：
向所述集中单元发送通信接口建立请求消息或所述分布单元的配置更新消息或配置更新确认消息，其中携带所述分布单元所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
相应的小区可被指定为主小区；
相应的小区能够作为小区组内的特殊小区；
相应的小区不可被指定为主小区；
相应的小区不能作为小区组内的特殊小区。
可选地，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
所述处理器1001具体用于：
向所述集中单元发送通信接口建立请求消息或节点配置更新消息或配置更新确认消息，其中携带所述分布单元的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
所述分布单元内仅能配置辅小区组SCG，或者所述分布单元所辖的所有小区均不可被指定为主小区；
所述分布单元内能配置主小区组MCG，或者所述分布单元所辖的所有小区中有至少一个小区可被指定为主小区。
可选地，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
所述处理器1001具体用于：
接收所述第二无线接入网节点发送的切换请求消息；
向所述第二无线接入网节点发送切换准备失败消息，其中携带用于指示切换目标小区不可被指定为主小区或不能作为小区组中的特殊小区的指示信息。
可选地，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
所述处理器1001具体用于：
接收所述集中单元发送的终端上下文建立请求消息或终端上下文修改请求消息，其中携带目标小区的标识；
向所述集中单元发送失败消息，其中携带用于指示所述目标小区不可被指定为主小区或作为小区组中的特殊小区的指示信息。
在此需要说明的是，本申请实施例提供的上述网络设备，能够实现上述方法实施例所实现的所有方法步骤，且能够达到相同的技术效果，在此不再对本实施例中与方法实施例相同的部分及有益效果进行具体赘述。
本申请实施例还提供了一种计算机可读存储介质，计算机可读存储介质存储有计算机可执行指令，计算机可执行指令用于使计算机执行上述实施例中网络设备所执行的方法。
本领域内的技术人员应明白，本申请的实施例可提供为方法、系统、或计算机程序产品。因此，本申请可采用完全硬件实施例、完全软件实施例、或结合软件和硬件方面的实施例的形式。而且，本申请可采用在一个或多个 其中包含有计算机可用程序代码的计算机可用存储介质(包括但不限于磁盘存储器、CD-ROM、光学存储器等)上实施的计算机程序产品的形式。
本申请是参照根据本申请的方法、设备(系统)、和计算机程序产品的流程图和/或方框图来描述的。应理解可由计算机程序指令实现流程图和/或方框图中的每一流程和/或方框、以及流程图和/或方框图中的流程和/或方框的结合。可提供这些计算机程序指令到通用计算机、专用计算机、嵌入式处理机或其他可编程数据处理设备的处理器以产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的装置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置的制造品，该指令装置实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上，使得在计算机或其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和/或方框图一个方框或多个方框中指定的功能的步骤。
显然，本领域的技术人员可以对本申请进行各种改动和变型而不脱离本申请的精神和范围。这样，倘若本申请的这些修改和变型属于本申请权利要求及其等同技术的范围之内，则本申请也意图包含这些改动和变型在内。

Claims (17)

  1. 一种无线接入模式指示方法，其特征在于，包括：
    无线接入网中的第一网元确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
    无线接入网中第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息；
    其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
    所述第一网元下的至少一个小区可被指定为主小区；
    所述第一网元下的至少一个小区不可被指定为主小区；
    所述第一网元可配置主小区组；
    所述第一网元不可配置主小区组；
    所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
    所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点。
  2. 如权利要求1所述的方法，其特征在于，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
    所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
    所述第一无线接入网节点向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
    相应的小区可被指定为主小区；
    相应的小区能够作为小区组内的特殊小区；
    相应的小区不可被指定为主小区；
    相应的小区不能作为小区组内的特殊小区。
  3. 如权利要求1所述的方法，其特征在于，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
    所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
    所述第一无线接入网节点向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
    所述第一无线接入网节点仅能作为双连接中的辅节点，或者所述第一无线接入网节点内能配置辅小区组SCG但不能配置主小区组MCG，或者所述第一无线接入网节点所辖的所有小区均不可被指定为主小区；
    所述第一无线接入网节点能作为双连接中的主节点或作为终端所连接的唯一的无线接入网节点，或者所述第一无线接入网节点内能配置MCG，或者所述第一无线接入网节点所辖的所有小区中至少一个小区可被指定为主小区。
  4. 如权利要求1所述的方法，其特征在于，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
    所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
    所述分布单元向所述集中单元发送通信接口建立请求消息或所述分布单元的配置更新消息或配置更新确认消息，其中携带所述分布单元所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
    相应的小区可被指定为主小区；
    相应的小区能够作为小区组内的特殊小区；
    相应的小区不可被指定为主小区；
    相应的小区不能作为小区组内的特殊小区。
  5. 如权利要求4所述的方法，其特征在于，还包括：
    所述集中单元向无线接入网节点发送第三消息，其中携带所述小区列表以及所述指示信息。
  6. 如权利要求1所述的方法，其特征在于，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
    所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
    所述分布单元向所述集中单元发送通信接口建立请求消息或节点配置更新消息或配置更新确认消息，其中携带所述分布单元的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
    所述分布单元内仅能配置SCG，或者所述分布单元所辖的所有小区均不可被指定为主小区；
    所述分布单元内能配置MCG，或者所述分布单元所辖的所有小区中有至少一个小区可被指定为主小区。
  7. 如权利要求1所述的方法，其特征在于，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
    所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
    所述第一无线接入网节点接收所述第二无线接入网节点发送的切换请求消息；
    所述第一无线接入网节点向所述第二无线接入网节点发送切换准备失败消息，其中携带用于指示切换目标小区不可被指定为主小区或不能作为小区组中的特殊小区的指示信息。
  8. 如权利要求1所述的方法，其特征在于，所述第一网元为分布式无线 接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
    所述无线接入网中的第一网元向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息，包括：
    所述分布单元接收所述集中单元发送的终端上下文建立请求消息或终端上下文修改请求消息，其中携带目标小区的标识；
    所述分布单元向所述集中单元发送失败消息，其中携带用于指示所述目标小区不可被指定为主小区或作为小区组中的特殊小区的指示信息。
  9. 一种网络设备，所述网络设备为无线接入网中的第一网元，其特征在于，包括：处理器、存储器、收发机；
    所述收发机，在处理器的控制下进行数据的接收和发送；
    所述存储器，存储计算机指令；
    所述处理器，用于读取所述计算机指令，执行以下操作：
    确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
    向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息；
    其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
    所述第一网元下的至少一个小区可被指定为主小区；
    所述第一网元下的至少一个小区不可被指定为主小区；
    所述第一网元可配置主小区组；
    所述第一网元不可配置主小区组；
    所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
    所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一 连接的无线接入网节点。
  10. 如权利要求9所述的网络设备，其特征在于，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
    所述处理器具体用于：
    向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
    相应的小区可被指定为主小区；
    相应的小区能够作为小区组内的特殊小区；
    相应的小区不可被指定为主小区；
    相应的小区不能作为小区组内的特殊小区。
  11. 如权利要求9所述的网络设备，其特征在于，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
    所述处理器具体用于：
    向所述第二无线接入网节点发送通信接口建立请求消息或节点配置更新消息，其中携带所述第一无线接入网节点的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
    所述第一无线接入网节点仅能作为双连接中的辅节点，或者所述第一无线接入网节点内能配置辅小区组SCG但不能配置主小区组MCG，或者所述第一无线接入网节点所辖的所有小区均不可被指定为主小区；
    所述第一无线接入网节点能作为双连接中的主节点或作为终端所连接的唯一的无线接入网节点，或者所述第一无线接入网节点内能配置MCG，或者所述第一无线接入网节点所辖的所有小区中至少一个小区可被指定为主小区。
  12. 如权利要求9所述的网络设备，其特征在于，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
    所述处理器具体用于：
    向所述集中单元发送通信接口建立请求消息或所述分布单元的配置更新消息或配置更新确认消息，其中携带所述分布单元所辖的全部或部分小区的小区列表，所述小区列表中的至少一个小区存在对应的指示信息，所述指示信息用于指示以下内容中的至少一个：
    相应的小区可被指定为主小区；
    相应的小区能够作为小区组内的特殊小区；
    相应的小区不可被指定为主小区；
    相应的小区不能作为小区组内的特殊小区。
  13. 如权利要求9所述的网络设备，其特征在于，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
    所述处理器具体用于：
    向所述集中单元发送通信接口建立请求消息或节点配置更新消息或配置更新确认消息，其中携带所述分布单元的无线接入模式的指示信息，所述指示信息用于指示以下内容中的至少一个：
    所述分布单元内仅能配置SCG，或者所述分布单元所辖的所有小区均不可被指定为主小区；
    所述分布单元内能配置MCG，或者所述分布单元所辖的所有小区中有至少一个小区可被指定为主小区。
  14. 如权利要求9所述的网络设备，其特征在于，所述第一网元和所述第二网元分别为第一无线接入网节点和第二无线接入网节点；
    所述处理器具体用于：
    接收所述第二无线接入网节点发送的切换请求消息；
    向所述第二无线接入网节点发送切换准备失败消息，其中携带用于指示切换目标小区不可被指定为主小区或不能作为小区组中的特殊小区的指示信息。
  15. 如权利要求9所述的网络设备，其特征在于，所述第一网元为分布式无线接入网节点中的分布单元，所述第二网元为所述分布式无线接入网节点中的集中单元；
    所述处理器具体用于：
    接收所述集中单元发送的终端上下文建立请求消息或终端上下文修改请求消息，其中携带目标小区的标识；
    向所述集中单元发送失败消息，其中携带用于指示所述目标小区不可被指定为主小区或作为小区组中的特殊小区的指示信息。
  16. 一种无线接入模式指示装置，其特征在于，包括：
    处理模块，用于确定所述第一网元相关的无线接入模式；其中，所述第一网元相关的无线接入模式包括：所述第一网元下的至少一个小区的无线接入模式，或者所述第一网元的无线接入模式；
    发送模块，用于向无线接入网中的第二网元发送第一消息，所述第一消息携带所述第一网元相关的无线接入模式的指示信息；
    其中，所述第一网元相关的无线接入模式的指示信息，用于指示以下内容中的至少一个：
    所述第一网元下的至少一个小区可被指定为主小区；
    所述第一网元下的至少一个小区不可被指定为主小区；
    所述第一网元可配置主小区组；
    所述第一网元不可配置主小区组；
    所述第一网元能够作为双连接中的主节点或者能够作为终端所唯一连接的无线接入网节点；
    所述第一网元不能够作为双连接中的主节点并且不能够作为终端所唯一连接的无线接入网节点。
  17. 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可执行指令，所述计算机可执行指令用于使所述计算机执行如权利要求1-8中任一项所述的方法。
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