WO2021062839A1 - 通信方法和通信装置 - Google Patents

通信方法和通信装置 Download PDF

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Publication number
WO2021062839A1
WO2021062839A1 PCT/CN2019/109768 CN2019109768W WO2021062839A1 WO 2021062839 A1 WO2021062839 A1 WO 2021062839A1 CN 2019109768 W CN2019109768 W CN 2019109768W WO 2021062839 A1 WO2021062839 A1 WO 2021062839A1
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WIPO (PCT)
Prior art keywords
terminal device
cell
condition
indication information
mcg
Prior art date
Application number
PCT/CN2019/109768
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English (en)
French (fr)
Inventor
胡星星
严乐
张宏平
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.)
Filing date
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 CN201980100878.3A priority Critical patent/CN114451063B/zh
Priority to PCT/CN2019/109768 priority patent/WO2021062839A1/zh
Priority to JP2022519767A priority patent/JP7332799B2/ja
Priority to BR112022005878A priority patent/BR112022005878A2/pt
Priority to EP19947763.9A priority patent/EP4044758A4/en
Publication of WO2021062839A1 publication Critical patent/WO2021062839A1/zh
Priority to US17/706,913 priority patent/US20220225203A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data
    • H04W36/305—Handover due to radio link failure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0069—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink
    • H04W36/00695—Transmission or use of information for re-establishing the radio link in case of dual connectivity, e.g. decoupled uplink/downlink using split of the control plane or user plane
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00835—Determination of neighbour cell lists
    • H04W36/008357—Determination of target cell based on access point [AP] properties, e.g. AP service capabilities
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/06—Reselecting a communication resource in the serving access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/00833—Handover statistics
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • This application relates to the field of communication, and more specifically, to a communication method and communication device
  • RRC radio resource control
  • the present application provides a communication method and communication device, which can avoid RRC reconstruction as much as possible.
  • a communication method which includes: when a terminal device detects a wireless connection failure, the terminal device performs cell selection; if the target cell belongs to a candidate cell pre-configured by a master node (MN), The terminal device accesses in the target cell; if the target cell does not belong to the candidate cell and no secondary cell group (SCG) failure is detected, the terminal device passes (secondary node, SN) sending a primary cell group MCG failure message to the MN; wherein the target cell is a cell selected by the terminal device for cell selection.
  • MN master node
  • SCG secondary cell group
  • the SCG is a group of cells associated with the SN, which may include a primary and secondary cell (PSCell), and may also include one or more secondary cells (SCell).
  • the cell is a serving cell.
  • the serving cell is a cell that provides services for the terminal device.
  • the MCG is a group of cells associated with the MN, and may include a primary cell (PCell), and may also include one or more secondary cells (SCell). Wherein, the cell is a serving cell.
  • PCell primary cell
  • SCell secondary cells
  • the primary and secondary cells and primary cells may be collectively referred to as special cells (SpCell).
  • the special cell may refer to the primary cell.
  • the MN configuring a candidate cell means that the MN configures the information of the candidate cell to the terminal device.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (physical cell identifier) of the candidate cell. cell identifier, PCI) and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI cell identifier
  • the terminal device can access the candidate cell based on the information of the candidate cell.
  • the method may further include: the terminal device receives conditional handover (CHO) configuration information sent by the MN, where the CHO configuration information is used to configure the candidate cell.
  • CHO conditional handover
  • the candidate cell is pre-configured by the MN through the CHO configuration information.
  • the specific form of the CHO configuration information can refer to the prior art.
  • the wireless connection failure detected by the terminal device includes one or more of the following situations: the MCG has a radio link failure; the MCG has a handover failure; the radio resource control RRC reconfiguration fails; or , The terminal device fails to perform an integrity check on a data packet received by a signaling radio bearer (signaling radio bearer, SRB) 1 or SRB2.
  • a signaling radio bearer signaling radio bearer 1 or SRB2.
  • the sending of measurement reports or handover commands may cause handover failure.
  • the terminal device performs access in the selected cell. Since the information of the candidate cell has been configured in advance by the MN, there is no need to send a measurement report or wait for a handover command before handover, which can improve the success rate of access to the selected cell.
  • the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to restore the wireless connection through the RRC reconfiguration or cell handover process, thereby avoiding the problem of the prior art RRC reconstruction.
  • the RRC reconfiguration process and the cell handover process will not cause the communication interruption and packet loss problems of the terminal equipment. Therefore, the method provided in this application avoids the problem of communication interruption or packet loss.
  • the RRC reconstruction process can avoid communication interruption and packet loss problems, thereby improving user experience.
  • the method further includes: if the target cell does not belong to the candidate cell, and the SCG is detected as a failure, the terminal device reports to the target The cell sends a radio resource control RRC re-establishment request message.
  • the terminal device can initiate an RRC reestablishment process by sending an RRC reestablishment request message, so that the wireless connection can be restored.
  • the method further includes: if the terminal device fails to access the target cell and the SCG failure is not detected, the The terminal device sends the MCG failure message to the MN through the SN.
  • the terminal device can send an MCG failure message to the MN through the SN to initiate an MCG quick recovery process to perform wireless connection recovery, avoiding RRC re-establishment.
  • the method before the terminal device performs cell selection, the method further includes: the terminal device receives the first indication information sent by the MN.
  • the first indication information is used to indicate that the terminal device prioritizes cell selection when detecting a wireless connection failure, and performs access in the selected cell when the selected cell belongs to the candidate cell.
  • the first indication information includes a first condition, and the first condition is used to indicate that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and the selected cell belongs to When the candidate cell is accessed in the selected cell, or,
  • the first indication information includes a first condition, and the first indication information is also used to indicate that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and selects the cell first. Access is performed in the selected cell when the cell belongs to the candidate cell.
  • the first indication information may be a radio resource control (radio resource control, RRC) message, but this application is not limited thereto.
  • RRC radio resource control
  • the MN instructs the terminal device through the first indication information what operation the terminal device needs to perform when it detects a wireless connection failure.
  • the terminal device can perform corresponding operations according to the instructions of the MN, thereby preventing the terminal device from detecting the wireless connection. In the event of failure, communication terminal problems caused by failure to perform reasonable operations.
  • the first condition includes one or more of the following: there is a cell with a signal quality greater than or equal to a first threshold in the candidate cells, or the signal quality of the SN is less than or equal to a second threshold .
  • the terminal device can increase the access success rate by performing access in the target cell when the signal quality is greater than or equal to a certain threshold.
  • the signal quality of the SN is less than or equal to a certain threshold, the message SN sent by the terminal device to the SN may not be successfully received. Therefore, compared to the way the terminal device sends an MCG failure message to the MN through the SN to try to restore the wireless connection, the cell It is more reasonable to choose to try to access candidate cells for wireless connection recovery.
  • the method before the terminal device sends a primary cell group MCG failure message to the MN through the SN, the method further includes: the terminal device receives the The second indication information sent by the MN.
  • the second indication information is used to instruct the terminal device to send the MCG failure message to the MN through the SN when the selected cell does not belong to the candidate cell, or,
  • the second indication information includes a second condition, and the second condition is used to indicate that when the selected cell does not belong to the candidate cell, and the second condition is met, the terminal device sends information to the SN through the SN.
  • the MN sends the MCG failure message, or,
  • the second indication information includes a second condition, and the second indication information also indicates that when the selected cell does not belong to the candidate cell and satisfies the second condition, the terminal device will send the SN to The MN sends the MCG failure message.
  • the second indication information may be an RRC message, but this application does not limit this.
  • the terminal device can perform corresponding operations when the selected cell does not belong to the candidate cell according to the instructions of the MN, so that problems such as communication interruption and prolonged communication caused by some unreasonable operations can be avoided.
  • the second condition includes one or more of the following: the signal quality of the selected cell is less than or equal to a third threshold, or the signal quality of the SN is greater than or equal to a fourth threshold .
  • the terminal device When the channel quality of the target cell is less than or equal to a certain threshold, the probability of the terminal device successfully accessing the target cell is small. Therefore, the terminal device is more suitable for sending the MCG failure message to the MN through the SN for wireless connection recovery. In addition, when the signal quality of the SN is greater than or equal to a certain threshold, the communication quality between the terminal device and the SN is better, so the terminal device can send an MCG failure message to the MN through the SN to try to restore the wireless connection.
  • a communication method which is characterized by including: a master node MN generates first indication information; and the MN sends the first indication information to a terminal device.
  • the first indication information is used to indicate that the terminal device prioritizes cell selection when detecting a wireless connection failure, and when the selected cell belongs to a candidate cell, access in the selected cell ,or,
  • the first indication information includes a first condition, and the first condition is used to indicate that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and the selected cell belongs to In the candidate cell, access in the selected cell, or,
  • the first indication information includes a first condition, and the first indication information is also used to indicate that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and selects the cell first.
  • the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and selects the cell first.
  • the candidate cell is a cell pre-configured by the MN for the terminal device.
  • the wireless connection failure detected by the terminal device includes one or more of the following situations: the MCG has a radio link failure; the MCG has a handover failure; the radio resource control RRC reconfiguration fails; or , The terminal device fails the integrity check of the data packet received by the SRB1 or SRB2.
  • the MN configuring a candidate cell means that the MN configures the information of the candidate cell to the terminal device.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (physical cell identifier) of the candidate cell. cell identifier, PCI) and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI cell identifier
  • the terminal device can access the candidate cell based on the information of the candidate cell.
  • the method further includes: the MN sends CHO configuration information to the terminal device, where the CHO configuration information is used to configure the candidate cell.
  • the MN instructs the terminal device through the first indication information what operation the terminal device needs to perform when it detects a wireless connection failure.
  • the terminal can perform corresponding operations according to the MN’s instructions, so as to prevent the terminal device from detecting a wireless connection failure. Communication terminal problems caused by reasonable wireless connection restoration.
  • the first condition includes one or more of the following: there is a cell with a signal quality greater than or equal to a first threshold in the candidate cells, or the signal quality of the secondary node SN is less than or equal to a second threshold .
  • the method may further include: the MN generates second indication information; and the MN sends the second indication information to the terminal device.
  • the second indication information is used to instruct the terminal equipment to send a primary cell group MCG failure message to the MN through the secondary node SN when the selected cell does not belong to the candidate cell, or,
  • the second condition of the second indication information where the second condition is used to instruct the terminal device to send information to the terminal device through the SN when the selected cell does not belong to the candidate cell and the second condition is met.
  • the MN sends the MCG failure message, or,
  • the second indication information includes a second condition, and the second indication information indicates that when the selected cell does not belong to the candidate cell, and the second condition is met, the terminal device sends the information to the terminal device through the SN.
  • the MN sends the MCG failure message.
  • the MN can send an MCG failure message to the MN through the SN by instructing the terminal equipment when the selected cell does not belong to the candidate cell, so that the terminal equipment can restore the radio link based on the MCG rapid recovery process, avoiding the use of RRC reconstruction .
  • the second condition includes one or more of the following: the signal quality of the selected cell is less than or equal to a third threshold, or the signal quality of the SN is greater than or equal to the fourth threshold. Threshold.
  • a communication method which includes: when a terminal device detects a wireless connection failure, if the secondary cell group SCG failure is not detected, the terminal device sends the primary cell group MCG to the primary node MN through the secondary node SN Failure message; if the SCG is detected as a failure, the terminal device performs cell selection; if the target cell belongs to a candidate cell pre-configured by the MN, the terminal device performs access in the target cell, wherein the The target cell is a cell selected by the terminal device for cell selection.
  • SCG is a group of cells associated with SN
  • MCG is a group of cells associated with MN
  • the wireless connection failure detected by the terminal device includes one or more of the following situations: the MCG has a radio link failure; the MCG has a handover failure; the radio resource control RRC reconfiguration fails; or , The terminal device fails the integrity check of the data packet received by one or more of SRB1 or SRB2.
  • the MN configuring a candidate cell means that the MN configures the information of the candidate cell to the terminal device.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (physical cell identifier) of the candidate cell. cell identifier, PCI) and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI cell identifier
  • the terminal device can access the candidate cell based on the information of the candidate cell.
  • the terminal device when a terminal device detects a wireless connection failure, on the one hand, when no SCG failure is detected, the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to go through the RRC reconfiguration or cell switching process To restore the wireless connection, thereby avoiding the RRC reconstruction in the prior art.
  • the terminal device when the SCG failure is detected, the terminal device can access the candidate cell when selecting the candidate cell, which further avoids the RRC reconstruction process in the prior art. Based on the above method, by avoiding the RRC reconstruction process, communication interruption and packet loss problems can be avoided, thereby improving user experience.
  • the method further includes: if the target cell does not belong to the candidate cell, the terminal device sends a radio resource control RRC reestablishment request to the target cell news.
  • the wireless connection can be restored through RRC reestablishment.
  • the method further includes: if the terminal device does not receive the MN's response to the MCG failure message, the terminal device performs cell selection and selects When the cell of belongs to a candidate cell pre-configured by the MN, the terminal device accesses in the selected cell.
  • the terminal device can try to access the candidate cell to avoid RRC reconstruction.
  • the method before the terminal device sends a primary cell group MCG failure message to the primary node MN through the secondary node SN, the method further includes: the terminal device receives The third indication information sent by the MN.
  • the third indication information is used to instruct the terminal device to preferentially send the MCG failure message to the MN through the SN when detecting a wireless connection failure, or,
  • the third indication information includes a third condition, and the third condition is used to indicate that when the terminal device detects that the wireless connection fails and satisfies the third condition, preferentially send the SN to the MN MCG failure message, or,
  • the third indication information includes a third condition, and the third indication information is used to indicate that when the terminal device detects that the wireless connection fails and satisfies the third condition, it will give priority to sending all information to the MN through the SN. Said MCG failure message.
  • the third indication information may be an RRC message, but this application does not limit this.
  • the MN instructs the terminal device through the third indication information what operation the terminal device needs to perform when it detects a wireless connection failure, and the terminal device can perform corresponding operations according to the MN’s instructions, thereby preventing the terminal device from detecting the wireless connection.
  • the terminal device In the event of failure, communication terminal problems caused by failure to perform reasonable operations.
  • the third condition includes: the signal quality of the SN is greater than or equal to a second threshold.
  • the terminal device can send an MCG failure message to the MN through the SN to try to restore the wireless connection.
  • the method before the terminal device accesses the target cell, the method further includes: the terminal device receives a fourth signal sent by the MN. Instructions.
  • the fourth indication information is used to indicate that when the terminal device cannot send the MCG failure message to the MN through the SN or does not receive a response from the MN to the MCG failure message, when Access in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth condition indicates that the terminal device cannot send the MCG failure message to the MN through the SN or has not received the MCG failure message from the MN When the fourth condition is met, access in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth indication information indicates that the terminal device cannot send the MCG failure message to the MN through the secondary SN or has not received the MCG response from the MN. In response to a failure message, and when the fourth condition is satisfied, access is performed in the candidate cell.
  • the fourth indication information may be an RRC message, but this application does not limit this.
  • the terminal device can perform corresponding operations when it cannot send an MCG failure message to the MN through the SN or does not receive a response from the MN to the MCG failure message according to the instructions of the MN, thereby avoiding some unreasonable operations. Problems such as communication interruption and prolonged.
  • the fourth condition includes: a cell with a signal quality greater than or equal to a fifth threshold exists in the candidate cells.
  • the terminal device can access in the target cell, which can improve the access success rate.
  • a communication method including: a master node MN generates third indication information; the MN sends the third indication information to a terminal device; wherein the third indication information is used to instruct the terminal device to When a wireless connection failure is detected, the primary cell group MCG failure message may be sent to the MN first through the secondary node SN, or the third indication information includes a third condition, and the third condition is used to instruct the terminal device When a wireless connection failure is detected and the third condition is met, the MCG failure message may be sent to the MN first through the SN, or the third indication information includes a third condition, and the third indication The information is used to indicate that the terminal device may preferentially send the MCG failure message to the MN through the SN when the terminal device detects that the wireless connection fails and satisfies the third condition.
  • the MN instructs the terminal device what operation the terminal device needs to perform when it detects a wireless connection failure through the third indication information, and the terminal can perform corresponding operations according to the instructions of the MN, thereby preventing the terminal device from detecting When the wireless connection fails, a communication terminal problem caused by the failure to perform a reasonable restoration of the wireless connection.
  • the third condition includes: the signal quality of the SN is greater than or equal to a second threshold.
  • the MN generates fourth indication information
  • the MN sends the fourth indication information to the terminal device; wherein the fourth indication information is used to indicate that the terminal device cannot send the MCG failure message to the MN through the SN or fails to receive the MCG message.
  • the MN responds to the MCG failure message, it may access in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth condition indicates that the terminal device cannot send the MCG failure message to the MN through the SN or has not received the MCG failure message from the MN When the fourth condition is met, access can be performed in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth indication information indicates that the terminal device cannot send the MCG failure message to the MN through the secondary SN or has not received the MCG response from the MN. In response to a failure message, and when the fourth condition is satisfied, access can be performed in the candidate cell;
  • the candidate cell is a cell pre-configured by the MN for the terminal device.
  • terminal equipment can preferentially access in candidate cells, avoiding direct RRC reconstruction.
  • the fourth condition includes: the signal quality in the candidate cell is greater than or equal to a fifth threshold.
  • a communication method which includes: when a terminal device detects a wireless connection failure, if there is a candidate cell that meets the sixth condition, the terminal device accesses in a target cell, and the target cell is The candidate cell that meets the sixth condition is a cell pre-configured by the master node MN; if there is no candidate cell that meets the sixth condition, and no secondary cell group SCG failure is detected, the terminal device Send the MCG failure message of the primary cell group to the MN through the secondary node SN.
  • the MN configuring a candidate cell means that the MN configures the information of the candidate cell to the terminal device.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (physical cell identifier) of the candidate cell. cell identifier, PCI) and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI cell identifier
  • the terminal device can access the candidate cell based on the information of the candidate cell.
  • the method may further include: the terminal device receives CHO configuration information sent by the MN, where the CHO configuration information is used to configure the candidate cell.
  • the candidate cell is pre-configured by the MN through the CHO configuration information.
  • the specific form of the CHO configuration information can refer to the prior art.
  • the wireless connection failure detected by the terminal device includes one or more of the following situations: the MCG has a radio link failure; the MCG has a handover failure; the radio resource control RRC reconfiguration fails; The terminal device fails to perform integrity verification on the data packets received by the signaling radio bearer (signaling radio bearer, SRB) 1 and SRB2.
  • the signaling radio bearer signaling radio bearer, SRB 1 and SRB2.
  • the sending of measurement reports or handover commands may cause handover failure.
  • the terminal device performs access in the selected cell. Since the information of the candidate cell has been configured in advance by the MN, there is no need to send a measurement report or wait for a handover command before handover, which can improve the success rate of access to the selected cell.
  • the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to restore the wireless connection through the RRC reconfiguration or cell handover process, thereby avoiding the problem of the prior art RRC reconstruction.
  • the RRC reconfiguration process and the cell switching process will not cause the communication interruption and packet loss problems of the terminal equipment. Therefore, the method provided in this application avoids The RRC reconstruction process can avoid communication interruption and packet loss problems, thereby improving user experience.
  • the sixth condition includes: the signal quality of the cell is greater than or equal to a certain threshold.
  • the terminal device When the signal quality of the cell is greater than a certain threshold, the terminal device has a higher probability of successfully accessing the cell, so the terminal device can try to access in the target cell.
  • the method further includes: if there is no candidate cell that satisfies the sixth condition, and the SCG is detected to fail, the terminal device reports to the The target cell sends a radio resource control RRC re-establishment request message.
  • the terminal device can initiate an RRC reestablishment process by sending an RRC reestablishment request message, so that the wireless connection can be restored.
  • the method further includes: if the terminal device fails to access the target cell and the SCG failure is not detected, the The terminal device sends the MCG failure message to the MN through the SN.
  • the terminal device can send an MCG failure message to the MN through the SN to initiate an MCG quick recovery process to perform wireless connection recovery, avoiding RRC re-establishment.
  • the method before the terminal device accesses the target cell, the method further includes: the terminal device receiving the fifth aspect sent by the MN Indication information; wherein, the fifth indication information is used to indicate that the terminal device prioritizes whether there is a candidate cell that meets the sixth condition when it detects a wireless connection failure, and when there is a candidate cell that meets the sixth condition When a candidate cell is selected, access is performed in a candidate cell that meets the sixth condition.
  • the fifth indication information may be an RRC message, but this application does not limit this.
  • the method before the terminal device sends a primary cell group MCG failure message to the MN through the secondary node SN, the method further includes: the terminal device receives all The sixth indication information sent by the MN; wherein the sixth indication information is used to indicate that the terminal device may send the MN to the MN through the SN when there is no candidate cell that meets the sixth condition MCG failure message.
  • the method further includes: if the terminal device fails to access the target cell and the SCG failure is not detected, the The terminal device sends the MCG failure message to the MN through the SN.
  • the terminal device can send an MCG failure message to the MN through the SN to initiate an MCG quick recovery process to perform wireless connection recovery, avoiding RRC re-establishment.
  • a communication method includes: a master node MN generates fifth indication information; and the MN sends the fifth indication information to a terminal device.
  • the fifth indication information is used to indicate that the terminal device prioritizes whether there is a candidate cell that meets the sixth condition when it detects a wireless connection failure, and when there is a candidate cell that meets the sixth condition, Access is performed in a candidate cell that meets the sixth condition, and the candidate cell is a cell pre-configured by the MN for the terminal device.
  • the MN instructs the terminal device through the fifth indication information what operation the terminal device needs to perform when it detects a wireless connection failure.
  • the terminal can perform corresponding operations according to the MN’s instructions, which can prevent the terminal device from detecting a wireless connection failure because there is no Communication terminal problems caused by reasonable wireless connection restoration.
  • the sixth condition includes: the signal quality of the cell is greater than or equal to a certain threshold.
  • the wireless connection failure detected by the terminal device includes one or more of the following situations: the MCG has a radio link failure; the MCG has a handover failure; the radio resource control RRC reconfiguration fails; or , The terminal device fails the integrity check of the data packet received by any one of SRB1 or SRB2.
  • the method further includes: the MN generates sixth indication information; the MN sends the sixth indication information to the terminal device, and the sixth indication information is used When instructing the terminal device to send an MCG failure message to the MN through the SN when there is no candidate cell that satisfies the sixth condition.
  • the MN can send an MCG failure message to the MN through the SN by instructing the terminal device when there is no candidate cell that meets the sixth condition, so that the terminal device can restore the radio link based on the MCG rapid recovery process, avoiding the use of RRC reconstruction.
  • a communication method which includes: when a terminal device detects a wireless connection failure, if no secondary cell group SCG failure is not detected, the terminal device sends the primary cell group MCG to the primary node MN through the secondary node SN Failure message; when the SCG failure is detected, if there is a candidate cell that meets the seventh condition, the terminal device accesses in the target cell, and the target cell is a candidate cell that meets the seventh condition.
  • the candidate cell is a cell pre-configured by the master node MN.
  • the wireless connection failure detected by the terminal device includes one or more of the following situations: the MCG has a radio link failure; the MCG has a handover failure; the radio resource control RRC reconfiguration fails; or , The terminal device fails the integrity check of the data packet received by the SRB1 or SRB2.
  • the MN configuring a candidate cell means that the MN configures the information of the candidate cell to the terminal device.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (physical cell identifier) of the candidate cell. cell identifier, PCI) and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI cell identifier
  • the terminal device can access the candidate cell based on the information of the candidate cell.
  • the terminal device when a terminal device detects a wireless connection failure, on the one hand, when no SCG failure is detected, the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to go through the RRC reconfiguration or cell switching process To restore the wireless connection, thereby avoiding the RRC reconstruction in the prior art.
  • the terminal device when the SCG failure is detected, the terminal device can access in the candidate cell when there is a candidate cell that meets the seventh condition, which further avoids the RRC reconstruction process in the prior art. Based on the above method, by avoiding the RRC reconstruction process, communication interruption and packet loss problems can be avoided, thereby improving user experience.
  • the seventh condition includes: the signal quality of the cell is greater than or equal to a certain threshold.
  • the method further includes: if there is a candidate cell that meets the seventh condition, the terminal device sends a radio resource control RRC reestablishment request message to the target cell.
  • the method further includes: if the terminal device does not receive a response from the MN to the MCG failure message, the terminal device has a candidate that meets the seventh condition When the cell is selected, access is performed in a candidate cell that meets the seventh condition.
  • the terminal device can try to access the candidate cell to avoid RRC reconstruction.
  • the method before the terminal device sends a primary cell group MCG failure message to the primary node MN through the secondary node SN, the method further includes: the terminal device receives the The seventh indication information sent by the MN; where the seventh indication information is used to indicate that the terminal device may preferentially send the MCG failure message to the MN through the SN when detecting a wireless connection failure.
  • the seventh indication information may be an RRC message, but this application does not limit this.
  • the MN instructs the terminal device through the seventh indication information what operation the terminal device needs to perform when it detects a wireless connection failure.
  • the terminal device can perform corresponding operations according to the MN’s instructions, thereby preventing the terminal device from detecting the wireless connection. In the event of failure, communication terminal problems caused by failure to perform reasonable operations.
  • the method before the terminal device accesses the target cell, the method further includes: the terminal device receiving the eighth sent by the MN Indication information; wherein, the eighth indication information is used to indicate that the terminal device cannot send the MCG failure message to the MN through the SN or when the MN does not receive a response to the MCG failure message , Access can be performed in the candidate cell.
  • the eighth indication information may be an RRC message, but this application does not limit this.
  • the terminal device can perform corresponding operations when it cannot send an MCG failure message to the MN through the SN or does not receive a response from the MN to the MCG failure message according to the instructions of the MN, thereby avoiding some unreasonable operations. Problems such as communication interruption and prolonged.
  • a communication method including: a master node MN generates seventh indication information; the MN sends the seventh indication information to a terminal device; wherein the seventh indication information is used to instruct the terminal device to When a wireless connection failure is detected, the primary cell group MCG failure message may be sent to the MN through the secondary node SN first.
  • the MN indicates through the seventh indication information that when the terminal device detects a wireless connection failure, it can send a primary cell group MCG failure message to the MN through the secondary node SN, so that the terminal device can preferentially recover the wireless connection through the MCG quick recovery process. Avoid RRC reconstruction.
  • the method further includes: the MN generates eighth indication information; the MN sends the eighth indication information to the terminal device; wherein the eighth indication information is used to instruct the terminal device
  • the MN generates eighth indication information
  • the MN sends the eighth indication information to the terminal device
  • the eighth indication information is used to instruct the terminal device
  • the MN indicates through the eighth indication information that the terminal device can access the candidate cell when it is unable to send the MCG failure message to the MN through the SN or does not receive a response from the MN to the MCG failure message , So that the terminal equipment can prioritize constant access in the candidate cell, avoiding RRC re-establishment.
  • a communication method which includes: when a terminal device detects an SCG failure, if there is a candidate cell that meets the eighth condition, the terminal device accesses the target cell, and the target cell is the one that meets the eighth condition.
  • the candidate cell is a cell pre-configured by the MN.
  • the terminal device when the SN fails, the terminal device can first determine the signal quality of the candidate cell. If the signal quality is good, the terminal device can directly switch to the candidate cell. After switching to the candidate cell, the terminal device can directly switch to the candidate cell. Perform data communication (using the wireless configuration information corresponding to the previous candidate cell) without first suspending the transmission carried in the SCG, reducing the time of service interruption.
  • the eighth condition includes: the signal quality of the cell is greater than or equal to a certain threshold.
  • the terminal device can access the candidate cell with better signal quality when it detects SCG failure.
  • the method further includes: if there is no cell that satisfies the eighth condition, the terminal device sends SCG failure indication information to the MN.
  • the method before the terminal device accesses in the target cell, the method further includes: the terminal device receives the ninth indication information sent by the MN The ninth indication information is used to instruct the terminal device to perform access in the target cell if there is a candidate cell that meets the eighth condition when the terminal device detects that the SCG fails.
  • a communication method including: the MN generates ninth indication information; the MN sends the ninth indication information to the terminal device, and the ninth indication information is used to instruct the terminal device to detect the SCG failure when the terminal device fails.
  • the candidate cell that meets the eighth condition is accessed in the target cell.
  • the target cell is a candidate cell that meets the eighth condition, and the candidate cell is a cell pre-configured by the MN.
  • the terminal device when the SN fails, the terminal device can first determine the signal quality of the candidate cell. If the signal quality is good, the terminal device can directly switch to the candidate cell. After switching to the candidate cell, the terminal device can directly switch to the candidate cell. Perform data communication (using the wireless configuration information corresponding to the previous candidate cell) without first suspending the transmission carried in the SCG, reducing the time of service interruption.
  • the ninth indication information may be an RRC message.
  • the eighth condition includes: the signal quality of the cell is greater than or equal to a certain threshold.
  • a communication device including a communication device for implementing the first aspect, the third aspect, the fifth aspect, the seventh aspect, the ninth aspect, and the first, third, fifth, and seventh aspects. Aspect, each module or unit of the method in any one of the possible implementation manners of the ninth aspect.
  • a communication device including a processor.
  • the processor is coupled with the memory and can be used to execute instructions in the memory to implement the first, third, fifth, seventh, ninth, and the first, third, and fifth aspects mentioned above.
  • the method in any one of the possible implementation manners of the seventh aspect and the ninth aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with the communication interface.
  • the communication device is a terminal device.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication device is a chip configured in a terminal device.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a communication device including a communication device for implementing the second, fourth, sixth, seventh, eighth, tenth aspects, as well as the second, fourth, sixth, and fourth aspects.
  • Each module or unit of the method in any one of the eighth aspect and the tenth aspect may be implemented.
  • a communication device including a processor.
  • the processor is coupled with the memory and can be used to execute instructions in the memory to implement the second, fourth, sixth, seventh, eighth, tenth, and second, fourth, and sixth aspects described above , The method in any one of the possible implementation manners of the eighth aspect and the tenth aspect.
  • the communication device further includes a memory.
  • the communication device further includes a communication interface, and the processor is coupled with the communication interface.
  • the communication device is a network device.
  • the communication interface may be a transceiver, or an input/output interface.
  • the communication device is a chip configured in a network device.
  • the communication interface may be an input/output interface.
  • the transceiver may be a transceiver circuit.
  • the input/output interface may be an input/output circuit.
  • a processor including: an input circuit, an output circuit, and a processing circuit.
  • the processing circuit is configured to receive a signal through the input circuit and transmit a signal through the output circuit, so that the processor executes any one of the first aspect to the tenth aspect and the first aspect to the tenth aspect. The method in the way.
  • the above-mentioned processor can be one or more chips
  • the input circuit can be an input pin
  • the output circuit can be an output pin
  • the processing circuit can be a transistor, a gate circuit, a flip-flop, and various logic circuits, etc.
  • the input signal received by the input circuit may be received and input by, for example, but not limited to, a receiver
  • the signal output by the output circuit may be, for example, but not limited to, output to the transmitter and transmitted by the transmitter
  • the circuit can be the same circuit, which is used as an input circuit and an output circuit at different times.
  • the embodiments of the present application do not limit the specific implementation manners of the processor and various circuits.
  • a processing device including a processor and a memory.
  • the processor is used to read instructions stored in the memory, receive signals through a receiver, and transmit signals through a transmitter to execute any one of the first aspect to the tenth aspect and any one of the possible implementation manners of the first aspect to the tenth aspect In the method.
  • processors there are one or more processors and one or more memories.
  • the memory may be integrated with the processor, or the memory and the processor may be provided separately.
  • the memory can be a non-transitory (non-transitory) memory, such as a read only memory (ROM), which can be integrated with the processor on the same chip, or can be set in different On the chip, the embodiment of the present application does not limit the type of the memory and the setting mode of the memory and the processor.
  • ROM read only memory
  • sending instruction information may be a process of outputting instruction information from the processor
  • receiving instruction information may be a process of receiving instruction information by the processor.
  • the data output by the processor can be output to the transmitter, and the input data received by the processor can come from the receiver.
  • the transmitter and receiver can be collectively referred to as a transceiver.
  • the processing device in the aforementioned sixteenth aspect may be one or more chips.
  • the processor in the processing device can be implemented by hardware or software.
  • the processor may be a logic circuit, an integrated circuit, etc.; when implemented by software, the processor may be a general-purpose processor, which is implemented by reading the software code stored in the memory, and the memory may Integrated in the processor, can be located outside the processor, and exist independently.
  • a computer program product includes: a computer program (also called code, or instruction) that, when the computer program is run, causes the computer to execute the first aspect to The tenth aspect and the method in any one of the possible implementation manners of the first aspect to the tenth aspect.
  • a computer program also called code, or instruction
  • a computer-readable medium stores a computer program (also called code, or instruction) when it runs on a computer, so that the computer executes the above-mentioned first aspect to The tenth aspect and the method in any one of the possible implementation manners of the first aspect to the tenth aspect.
  • a computer program also called code, or instruction
  • a communication system including the aforementioned network equipment and terminal equipment.
  • Figure 1 is a schematic diagram of a base station with a CU/DU separation architecture
  • Figure 2 is a schematic diagram of a DC scenario applied to this application
  • Figure 3 is a schematic flow chart of the RRC reconstruction process
  • Fig. 4 is a schematic diagram of a communication method provided by the present application.
  • Fig. 5 is a schematic flowchart of a communication method provided by the present application.
  • Fig. 6 is a schematic diagram of a communication method provided by the present application.
  • Fig. 7 is a schematic flowchart of a communication method provided by the present application.
  • Fig. 8 is a schematic flowchart of a communication method provided by the present application.
  • Fig. 9 is a schematic block diagram of a communication device provided by the present application.
  • FIG. 10 is a schematic diagram of the structure of a network device provided by this application.
  • FIG. 11 is a schematic diagram of the structure of the terminal device provided by the present application.
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • 5G fifth generation
  • NR new radio
  • the terminal equipment in the embodiments of this application may refer to user equipment, access terminals, user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile equipment, user terminals, terminals, wireless communication equipment, user agents, or User device.
  • the terminal equipment can also be a cellular phone, a cordless phone, a session initiation protocol (session initiation protocol, SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (personal digital assistant, PDA), with wireless communication Functional handheld devices, computing devices or other processing devices connected to wireless modems, in-vehicle devices, wearable devices, terminal devices in the future 5G network, or future evolution of the public land mobile network (PLMN) Terminal equipment, etc., which are not limited in the embodiment of the present application.
  • PLMN public land mobile network
  • the network equipment in the embodiments of this application may be any equipment with wireless transceiver functions, including but not limited to: evolved Node B (evolved Node B, eNB), radio network controller (RNC), node B (Node B, NB), base station controller (BSC), base transceiver station (BTS), home base station (for example, home evolved NodeB, or home Node B, HNB), baseband unit ( baseband unit, BBU), the access point (AP), wireless relay node, wireless backhaul node, transmission point (TP), or transmit/receive point in a wireless fidelity (WiFi) system (transmission and reception point, TRP), etc.
  • 5G such as NR, gNB in the system, or transmission point (TRP or TP), one or a group of base stations in the 5G system (including multiple antenna panels) )
  • Antenna panel or, it can also be a network node that constitutes a gNB or transmission point, such as a baseband unit (B
  • the base station (such as gNB) may be a base station with a centralized unit (CU)/DU separation architecture.
  • CU centralized unit
  • Figure 1 shows a base station with a CU/DU separation architecture.
  • CU and DU can be understood as the division of base stations from the perspective of logical functions. CU and DU can be physically separated or deployed together. Multiple DUs can share one CU. One DU can also be connected to multiple CUs. The CU and the DU can be connected through an interface, for example, an F1 interface. CU and DU can be divided according to the protocol layer of the wireless network. For example, radio resource control (RRC), service data adaptation protocol (SDAP), and packet data convergence protocol (PDCP) layer functions can be set in the CU, and Functions such as radio link control (RLC), media access control (MAC) layer, and physical (physical, PHY) layer can be set in the DU.
  • RRC radio resource control
  • SDAP service data adaptation protocol
  • PDCP packet data convergence protocol
  • RLC radio link control
  • MAC media access control
  • PHY physical (physical, PHY) layer
  • the functions of the CU can be implemented by one entity or by different entities.
  • the functions of the CU can be further divided, for example, the control plane (CP) and the user plane (UP) are separated, that is, the CU control plane (CU-CP) and the CU user plane (CU-UP).
  • the CU-CP and CU-UP may be implemented by different functional entities, and the CU-CP and CU-UP may be coupled with the DU to jointly complete the function of the base station.
  • the CU-CP is responsible for the control plane function, which mainly includes RRC and PDCP (PDCP-C) for processing RRC messages.
  • PDCP-C is mainly responsible for encryption and decryption of RRC messages, integrity protection, and data transmission.
  • CU-UP is responsible for user plane functions, mainly including SDAP and PDCP for processing user data.
  • SDAP is mainly responsible for processing the data of the core network and mapping the data flow to the bearer.
  • PDCP-U is mainly responsible for user data encryption and decryption, integrity protection, header compression, serial number maintenance, data transmission, etc.
  • CU-CP and CU-UP are connected through the E1 interface.
  • CU-CP represents that the base station is connected to the core network through the Ng interface.
  • CU-UP is connected to DU through F1 user plane (F1-U).
  • the terminal device or the network device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer.
  • the hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also referred to as main memory).
  • the operating system may be any one or more computer operating systems that implement business processing through processes, for example, Linux operating systems, Unix operating systems, Android operating systems, iOS operating systems or windows operating systems.
  • the application layer includes applications such as browsers, address books, word processing software, and instant messaging software.
  • the embodiments of the application do not specifically limit the specific structure of the execution body of the method provided in the embodiments of the application, as long as the program that records the codes of the methods provided in the embodiments of the application can be provided in accordance with the embodiments of the application.
  • the execution subject of the method provided in the embodiments of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.
  • various aspects or features of the present application can be implemented as methods, devices, or products using standard programming and/or engineering techniques.
  • article of manufacture used in this application encompasses a computer program accessible from any computer-readable device, carrier, or medium.
  • computer-readable media may include, but are not limited to: magnetic storage devices (for example, hard disks, floppy disks, or tapes, etc.), optical disks (for example, compact discs (CD), digital versatile discs (DVD)) Etc.), smart cards and flash memory devices (for example, erasable programmable read-only memory (EPROM), cards, sticks or key drives, etc.).
  • various storage media described herein may represent one or more devices and/or other machine-readable media for storing information.
  • machine-readable medium may include, but is not limited to, wireless channels and various other media capable of storing, containing, and/or carrying instructions and/or data.
  • the method provided in this application is applied to a dual connectivity (DC) scenario.
  • DC dual connectivity
  • a UE may communicate with multiple base stations, that is, dual connectivity (DC), also known as multi-radio dual connectivity (MR-DC).
  • DC dual connectivity
  • MR-DC multi-radio dual connectivity
  • These multiple base stations may be base stations of the same standard (for example, all 4G base stations, or all 5G base stations), or base stations with different mechanisms (for example, one is a fourth-generation 4G base station and the other is a fifth-generation 5G base station) .
  • FIG. 2 shows a schematic diagram of a DC scene applied to this application.
  • the UE 140 may communicate with the base station 110 and the base station 120 through the DC technology, and the base station 110 and the base station 120 access the core network 130 together.
  • the core network 130 may be a 4G core network or a 5G core network.
  • the base station that has control plane signaling interaction with the core network is called a master node (master node, MN), and other base stations are called secondary nodes (secondary node, SN).
  • MN master node
  • SN secondary node
  • the MN is sometimes called the primary base station
  • the SN is sometimes called the secondary base station.
  • E-UTRA-NR dual connectivity E-UTRA-NR dual connectivity
  • EN-DC evolved universal land-based wireless access and new wireless dual connectivity
  • NG-RAN E-UTRA-NR dual connectivity NGEN-DC
  • NR-E-UTRA dual connectivity NE -DC
  • New Wireless and New Wireless Dual Connectivity NR-NR dual connectivity, NR-DC
  • the primary base station is an LTE base station (e.g., eNB) connected to the 4G core network
  • the secondary base station is an NR base station (e.g., gNB).
  • the primary base station is an LTE base station connected to the 5G core network
  • the secondary base station is an NR base station.
  • the primary base station is an NR base station connected to the 5G core network
  • the secondary base station is an LTE base station.
  • the primary base station is an NR base station connected to the 5G core network
  • the secondary base station is an NR base station.
  • the serving cell under the secondary base station is called a secondary cell group (SCG), and the secondary cell group is composed of a primary SCG cell (PSCell) and optionally one or more secondary cells.
  • the cell under the primary base station is called a master cell group (master cell group, MCG), which is composed of a primary cell (primary cell, PCell) and optionally one or more secondary cells.
  • PCell refers to the MCG cell deployed in the primary frequency point, and the UE performs the initial connection establishment process or the connection re-establishment process in the cell, or specifies the cell as the PCell during the handover process.
  • PScell refers to the cell in which the UE performs random access when performing the synchronized reconfiguration process in the SCG cell, or when the SCG change is performed and the random access process is not required, the UE initiates the initial physical uplink share channel (PUSCH) ) The cell of the transmission.
  • PUSCH physical uplink share channel
  • the mobility management of the connected terminal device is controlled by the network device, that is, the network device instructs the terminal device to switch to which cell and how to switch by sending a handover message.
  • the source network device sends a handover message to the terminal device to control the terminal device to switch from the source cell to the target cell.
  • the terminal device accesses the target cell according to the content contained in the handover message. Therefore, the successful transmission of the handover message is a necessary condition to ensure the successful handover under the traditional handover mechanism.
  • the network device generally judges whether to instruct the terminal device to switch based on the signal quality reported by the terminal device. For example, the terminal device detects that the signal quality of the neighboring cell is better than the signal quality of the current serving cell than a certain threshold. , The terminal device reports the measurement result.
  • the rapid attenuation of signal quality, or the rapid movement of the terminal device, the obstruction of objects, and the long duration of the handover preparation will cause the measurement report to fail to be sent. In turn, the handover fails and the success rate of handover is reduced.
  • the CHO mechanism is proposed to improve the handover success rate.
  • the source cell sends the CHO configuration information to the terminal device when the source link quality is good.
  • the CHO configuration information can include the CHO trigger condition and the information of one or more candidate cells.
  • the candidate cell information can include the candidate cell.
  • CGI cell global identifier
  • PCI physical cell identifier
  • the terminal device judges whether the candidate cell meets the CHO trigger condition according to the CHO configuration information, and uses a candidate cell that meets the CHO trigger condition as the target cell. Then, the terminal device performs a random access process with the determined target cell. When the random access is successfully completed, the terminal device sends an RRC message (such as an RRC reconfiguration complete message) to the target cell to notify the target cell that the condition switching is completed.
  • RRC message such as an RRC reconfiguration complete message
  • the terminal device detects whether the SCG fails. If the SCG fails to be detected, the terminal device can initiate the MCG quick recovery process.
  • the MCG quick recovery process roughly includes: the terminal device sends an MCG failure message to the MN through the SN, and the MN performs certain operations according to the MCG failure message, such as initiating RRC reconfiguration or cell switching to recover the MCG. If it detects that the SCG fails, the terminal device initiates the RRC re-establishment process.
  • RRC reconfiguration that is, RRC connection reconfiguration, aims to modify the RRC connection, such as establishing, modifying or releasing a radio bearer (RB), performing handover, and establishing, modifying or releasing one or more of the measurements.
  • the terminal device After receiving the RRC (or RRC connection) reconfiguration message sent by the network device (eg, MN), the terminal device performs corresponding operations, such as switching, according to the content in the RRC reconfiguration message. If the terminal device successfully performs the corresponding operation, it sends an RRC reconfiguration complete message to the network device to complete the RRC reconfiguration.
  • the terminal device can initiate an RRC re-establishment process in the RRC connection state to restore the RRC connection.
  • FIG. 3 shows the general process of RRC reconstruction when the terminal device is connected to the 5G core network.
  • the RRC reconstruction process shown in 3 mainly involves the interaction between the terminal device and the network device, and the interaction between the network device and the core network device is not shown here.
  • the terminal device sends an RRC re-establishment request message to the target network device.
  • the source network device refers to the network device corresponding to the source cell
  • the target network device is the network device corresponding to the target cell.
  • the terminal device before the terminal device sends the RRC re-establishment request message, the terminal device will perform the following actions: suspend all RBs, except for signaling radio bearer 0 (signalling radio bearer 0, SRB0); reset the MAC layer ; Release the secondary cell in the MCG; release the configuration of the SCG; perform the cell selection process.
  • the terminal device cell selects a cell of the same standard, the terminal device will send an RRC re-establishment request message.
  • the terminal equipment cell selects a cell of a different standard, the terminal equipment enters the RRC idle state (RRC_IDLE).
  • the terminal device Before sending the RRC re-establishment request message, the terminal device may also perform the following actions:
  • the PDCP corresponding to signaling radio bearer 1 (signaling radio bearer 1, SRB1) is rebuilt, the RLC corresponding to SRB1 is rebuilt, and SRB1 is restored.
  • the target network device sends a context request message to the source network device according to the RRC reconstruction request message.
  • the source network device After receiving the context request message sent by the target network device, the source network device sends the context of the terminal device to the target network device.
  • the target network device After receiving the context of the terminal device, the target network device sends an RRC re-establishment message to the terminal device.
  • the purpose of the RRC reconstruction message is to reconstruct SRB1 and update the encryption key.
  • the terminal device After receiving the RRC reconstruction message, the terminal device considers the current cell as the primary cell PCell, stores the encryption key carried in it, and restores the encryption and integrity protection of the SRB.
  • S305 The terminal device replies to the target network device with an RRC reconstruction complete message, where the message is used to determine the successful completion of the RRC reconstruction.
  • the target network device sends an RRC reconfiguration message to the terminal device.
  • the target network device may carry some information to notify the terminal device to perform reconfiguration of SRB2 and data radio bearers (DRB).
  • DRB data radio bearers
  • S307 The terminal device replies an RRC reconfiguration complete message to the target network device.
  • the target network device can request data transfer from the source network device, and the source network device transfers the downlink data packets that have not been successfully sent to the terminal device and/or the uplink data packets that the source network device has received correctly but received out of order to the target Base station.
  • the target base station can send it to the terminal device.
  • the target network device etc. correctly receive other data packets from the terminal device, so that these data packets can be submitted to the terminal device in order.
  • the upper layer for example, the PDCP layer of the target network device can submit these uplink data packets to the upper layer in order), and then submit these packets to the upper layer.
  • the target cell and the source cell selected by the terminal device may not be of the same standard. For example, one is a 4G cell and the other is a 5G cell.
  • the terminal device will enter the RRC idle state, thereby causing the terminal to enter the RRC idle state.
  • the communication of the device is interrupted.
  • the target cell and the source cell are of the same standard, if there is no direct Xn/X2 interface between the target network device and the source network device, the source network device cannot send the context of the terminal device to the target network device, and the source network device It is also unable to transfer the data packet to the target network device, resulting in packet loss problems. Therefore, it should be avoided as far as possible to initiate the RRC re-establishment process in the prior art to restore the wireless connection.
  • this application provides two mechanisms to reduce the probability of a terminal device initiating the RRC re-establishment process in the prior art, thereby reducing the probability of communication interruption of the terminal device and improving user experience.
  • the terminal device When the terminal device detects that the wireless connection fails, the terminal device prioritizes cell selection. If the selected cell belongs to a candidate cell pre-configured by the MN, the terminal device accesses in the selected cell; if the selected cell does not belong to the candidate cell, the terminal device passes when it does not detect SCG failure The SN sends the MCG failure message of the primary cell group to the MN.
  • the sending of measurement reports or handover commands may cause handover failure.
  • the terminal device performs access in the selected cell. Since the information of the candidate cell has been configured in advance by the MN, there is no need to send a measurement report or wait for a handover command before handover, which can improve the success rate of access to the selected cell.
  • the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to restore the wireless connection through the RRC reconfiguration or cell handover process, thereby avoiding the problem of the prior art RRC reconstruction.
  • the RRC reconfiguration process and the cell handover process will not cause the communication interruption and packet loss problems of the terminal equipment. Therefore, the method provided in this application avoids the problem of communication interruption or packet loss.
  • the RRC reconstruction process can avoid communication interruption and packet loss problems, thereby improving user experience.
  • the terminal device When the terminal device detects that the wireless connection fails, if it does not detect the SCG failure, it sends an MCG failure message to the MN through the SN. If SCG failure is detected, cell selection is performed, and when the selected cell is a candidate cell pre-configured by the MN, access is performed in the selected cell.
  • a terminal device detects a wireless connection failure
  • the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to resume wireless through the RRC reconfiguration or cell switching process. Connect, thereby avoiding the RRC re-establishment in the prior art.
  • the terminal device can access the candidate cell when selecting the candidate cell, which further avoids the RRC reconstruction process in the prior art. Based on the above method, by avoiding the RRC reconstruction process, communication interruption and packet loss problems can be avoided, thereby improving user experience.
  • whether the terminal device specifically uses mechanism one or mechanism two to perform wireless connection recovery may be specified by the protocol or may be instructed by the MN.
  • the protocol stipulates that the terminal device adopts mechanism one to recover the wireless connection.
  • the protocol can also stipulate that the terminal device does not use the first mechanism but uses the second mechanism to restore the wireless connection.
  • the MN instructs the terminal device to use mechanism one to recover the wireless connection.
  • the MN can also instruct the terminal device not to adopt mechanism one but adopt mechanism two to restore the wireless connection.
  • the MN may send first indication information to the terminal device.
  • the first indication information may instruct the terminal device to use mechanism one to recover the wireless connection, or in other words, the first indication information may indicate that the terminal device prioritizes the process when it detects a wireless connection failure. Cell selection, and access in the selected cell when the selected cell belongs to the candidate cell.
  • the MN may send third indication information to the terminal device.
  • the third indication information may indicate that the terminal device adopts mechanism two to recover the wireless connection.
  • the third indication information may indicate that the terminal device has priority when detecting a wireless connection failure.
  • the agreement stipulates certain conditions, and the agreement stipulates that when the condition is established, which of the mechanism one and the mechanism two is used by the terminal device to restore the wireless connection, when the condition is not established, the terminal device uses the mechanism one and Which of the mechanism two is used for wireless connection recovery?
  • a certain condition is indicated by the MN and stipulated by the agreement.
  • the terminal device adopts either mechanism 1 or mechanism 2 for wireless connection recovery.
  • the terminal device adopts mechanism 1. And which one of mechanism two is used for wireless connection recovery.
  • the MN indicates a certain condition
  • the MN indicates that when the condition is established, which of the mechanism one and the mechanism two is used by the terminal device for wireless connection recovery, when the condition is not established, the terminal device uses the mechanism one And which one of mechanism two is used for wireless connection recovery.
  • the terminal device adopts one of the mechanism 1 and the mechanism 2; if the judgment condition #1 is not established, the terminal device adopts the other of the mechanism 1 and the mechanism 2. For example, if the judgment condition #1 is established, the terminal device adopts mechanism one, and if the judgment condition #1 is not established, the terminal device adopts mechanism two. An example is given below.
  • the judgment condition #1 may be the first condition. If the first condition is met, or the first condition is established, the terminal device adopts mechanism one; otherwise, the terminal device adopts mechanism two.
  • the MN may send the first indication information to the terminal device, the first indication information may include the first condition, and the first condition instructs the terminal device to adopt the first mechanism when the first condition is satisfied, or in other words,
  • the first condition indicates that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and performs access in the selected cell when the selected cell belongs to the candidate cell.
  • the MN may send the first indication information to the terminal device, the first indication information may include the first condition, and the first indication information may also indicate that the terminal device adopts the first mechanism when the first condition is satisfied.
  • the first indication information indicates that the terminal device prioritizes cell selection when it detects that the wireless connection fails and meets the first condition, and performs access in the selected cell when the selected cell belongs to the candidate cell.
  • the first condition may be that a cell with a signal quality greater than a first threshold exists among the candidate cells pre-configured by the MN. Then, if there is a cell with a signal quality greater than the first threshold among the candidate cells, the terminal device adopts mechanism one; if there is no cell with a signal quality greater than the first threshold among the candidate cells, the terminal device adopts mechanism two.
  • the first condition may be that the signal quality of the SN is less than or equal to the second threshold. Then, if the signal quality of the SN is less than or equal to the second threshold, the terminal device adopts mechanism one; if the signal quality of the SN is greater than the second threshold, the terminal device adopts mechanism two.
  • the signal quality of the SN in this application may refer to the signal quality of the PSCell.
  • the signal quality in this application can be reference signal received power (RSRP), reference signal received quality (RSRQ), and signal to interference plus noise ratio (SINR).
  • RSRP reference signal received power
  • RSRQ reference signal received quality
  • SINR signal to interference plus noise ratio
  • the judgment condition #1 may be the third condition. If the third condition is met, or the third condition is established, the terminal device adopts mechanism two; otherwise, the terminal device adopts mechanism one.
  • the MN may send third indication information to the terminal device, the third indication information may include a third condition, and the third condition instructs the terminal device to adopt the second mechanism when the third condition is met, or in other words,
  • the third condition indicates that when the terminal device detects that the wireless connection fails and satisfies the third condition, it may preferentially send the MCG failure message to the MN through the SN.
  • the MN may send third indication information to the terminal device, the third indication information may include the third condition, and the third indication information may also instruct the terminal device to adopt the second mechanism when the third condition is satisfied.
  • the third indication information indicates that when the terminal device detects that the wireless connection fails and satisfies the third condition, it may preferentially send the MCG failure message to the MN through the SN.
  • the third condition may be that the signal quality of the SN is greater than the second threshold. Then, if the signal quality of the SN is greater than the second threshold, the terminal device adopts mechanism two; if the signal quality of the SN is ⁇ the second threshold, the terminal device adopts mechanism one.
  • the terminal device may correspond to the UE 140
  • the MN may correspond to one of the base station 110 and the base station 120
  • the SN may correspond to the other of the base station 110 and the base station 120.
  • FIG. 4 shows a communication method 400.
  • the method 400 corresponds to mechanism one. The steps of the method shown in FIG. 4 will be described below.
  • S410 The MN sends configuration information to the terminal device.
  • the configuration information may include information about one or more candidate cells.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (PCI) of the candidate cell and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI physical cell identifier
  • the configuration information may be CHO configuration information.
  • the specific form of the CHO configuration information can be referred to the above description in the CHO mechanism or can be referred to the prior art.
  • S420 The terminal device performs cell selection when detecting that the wireless connection fails.
  • wireless connection failure may include one or more of the following situations:
  • RLF occurred in MCG, including one or more of the following: (a) A physical layer problem was detected. For example, when the RRC layer of the terminal device receives continuous N primary cell PCell out-of-synchronization indications from the bottom layer, and does not receive continuous M primary cell PCell synchronization indications from the bottom layer for a period of time. (b) The random access procedure performed at the MCG fails. (c) The maximum number of retransmissions in the MCG RLC layer has been reached.
  • the terminal device does not successfully complete the MCG configuration and requires the terminal device to synchronize the RRC reconfiguration (for example, when the terminal device receives a reconfiguration message that carries the need to perform synchronization (for example, the RRC reconfiguration message carries the reconfigurationWithSync cell)
  • the terminal device starts timing T304. If the terminal device successfully executes the random access procedure in the target cell issued in the RRC reconfiguration message, the terminal device cancels T304. If the T304 timer expires, it is considered that the terminal device did not successfully complete the need Synchronized RRC reconfiguration).
  • RRC reconfiguration fails, for example, the terminal device cannot comply with part of the configuration in the received RRC reconfiguration message.
  • the terminal device fails the integrity check of the received data packet. That is, the PDCP layer of the terminal device fails the integrity check of the data packet received in the SRB1 or SRB2.
  • the terminal device may use the S standard side to perform cell selection.
  • the calculation formula of S rxlev is:
  • Q rxlevmeas the received signal strength value measured by the terminal device, and the value is the measured reference signal receiving power (RSRP);
  • Q rxlevmin the minimum received signal strength value required by the cell
  • P compensation (PEMAX-PUMAX) or the larger value of 0, where PEMAX is the maximum allowable transmission power set by the system when the terminal device accesses the cell; PUMAX refers to the maximum output power specified by the terminal device level.
  • Q rxlevminoffset This parameter can only be used when the terminal device normally resides in a virtual private mobile network (VPMN) and periodically searches for a high-priority public land mobile network (PLMN) for cell selection It is only valid during evaluation. This parameter biases Q rxlevmin to a certain extent.
  • VPMN virtual private mobile network
  • PLMN public land mobile network
  • the cell selection performed by the terminal device may not be the cell selection performed during the RRC re-establishment process (for example, the terminal device may directly perform cell selection after checking that the wireless connection fails), or it may be the cell selected during the RRC re-establishment process.
  • the protocol puts the cell selection in this step in the RRC reconstruction, but the RRC reconstruction is not the same as the RRC reconstruction in the prior art. For example, at least the following behavior will not be performed: suspend all RBs (except SRB0), release at least one item in the SCG configuration.
  • S420 if the cell selected by the terminal device is a candidate cell, S430 is executed, otherwise, S440 is executed.
  • S430 is executed.
  • S440 is still performed.
  • the MN may instruct the terminal device to select the cell as a candidate cell when the selected cell is the fifth condition, and select the cell first when the selected cell belongs to the candidate cell.
  • the fifth condition may be that there are candidate cells with signal quality greater than a certain threshold, or the signal quality of the SN is less than or equal to a certain threshold.
  • the fifth condition may be configured by the MN, or may be specified by the agreement, which is not limited in this application.
  • S430 The terminal device accesses in the selected cell.
  • target cell #1 the cell selected by the terminal device in S420 is referred to as target cell #1. That is, if the target cell #1 is one of the one or more candidate cells configured by the MN through the configuration information, the terminal device accesses in the target cell #1.
  • the target cell #1 corresponds to (or belongs to) the MN, that is, the target cell #1 belongs to the MCG of the MN, then in S430, the terminal device accesses the MN.
  • the target cell #1 and the source cell i.e., the cell where the wireless connection fails with the terminal device
  • the MN may be the source network equipment, or the source MN
  • the target cell# 1 The corresponding network device is the target network device.
  • it is recorded as: target network device #1.
  • Figure 4 shows a situation where the target cell #1 and the source cell correspond to different network devices.
  • the target network device #1 may also instruct the source MN to release the context of the terminal device.
  • the target network device #1 after the terminal device accesses the target cell #1, it also involves some interactions between the target network device #1 and the core network device.
  • interaction content may refer to the target network device and core network device in the cell handover process in the prior art. The content of the interaction is the same. For details, please refer to the cell handover process in the prior art, which will not be repeated here.
  • the terminal device accessing the target cell #1 may specifically be that the terminal device initiates a random access procedure and sends an RRC reconfiguration complete message to the target cell #1, but this application does not limit this.
  • the terminal device may directly send an RRC reconfiguration complete message according to the uplink authorization information sent by target cell #1 without a random access procedure in target cell #1.
  • the terminal device may perform S440 and subsequent corresponding steps.
  • the MN may send an indication message to the terminal device (for example, before S430. For example, in S40), indicating that the terminal device fails to access in the target cell #1, such as when the RRC reconfiguration complete message is not received, and there is no
  • the MCG quick recovery process is initiated by sending an MCG failure message.
  • S440 The terminal device judges whether the SCG fails to be detected.
  • SCG failure can be one or more of the following:
  • a problem with the physical layer is detected. For example, when the RRC layer of the terminal device receives continuous out-of-synchronization indications of N primary and secondary cell PSCells from the bottom layer, and does not receive continuous M synchronization indications of the primary and secondary cell PSCells from the bottom layer for a period of time;
  • S450 if no SCG failure is detected, S450 is executed.
  • S460 is executed.
  • the MN may instruct the terminal device whether to perform S450 when the target cell #1 is not a candidate cell and SCG failure is not detected.
  • the source MN may send second indication information to the terminal device, and the second indication information may be in any of the following forms:
  • the second indication information indicates that the terminal device can send an MCG failure message to the MN through the SN when the selected cell does not belong to the candidate cell. In this way, the terminal device may perform S450 when the target cell #1 does not belong to the candidate cell and does not detect SCG failure.
  • the second indication information includes a second condition, and the second condition is used to indicate that the terminal device can send an MCG failure message to the MN through the SN when the selected cell does not belong to the candidate cell and the second condition is met.
  • the second condition is indicated by the MN and stipulated by the agreement.
  • the terminal device can send the SN to the SN if the SCG fails to be detected.
  • the MN sends an MCG failure message.
  • the second condition may be that the signal quality of the SN is greater than the fourth threshold, or the signal quality of the target cell is less than the third threshold.
  • the second indication information includes a second condition, and the second indication information indicates that the terminal device may send an MCG failure message to the MN through the SN when the selected cell does not belong to the candidate cell and the second condition is met.
  • the MN indicates the second condition
  • the MN indicates that when the selected cell does not belong to the candidate cell, and the second condition is satisfied
  • the terminal device sends to the MN through the SN when the SCG fails to be detected MCG failure message.
  • the second condition is as mentioned before, so I won't repeat it here.
  • the configuration information in S410, the first indication information described above, and the second indication information here may be carried through the same piece of signaling, or may be carried through different signaling, which is not limited in this application.
  • S450 The terminal device initiates an MCG quick recovery process.
  • the terminal device attempts to restore the wireless connection by initiating the MCG quick recovery process.
  • the MCG quick recovery process can include: S450a to S450e.
  • S450a The terminal device sends an MCG failure message to the SN.
  • the MCG failure message can be carried in the RRC message of the SN, such as SRB3.
  • the MCG failure message can also be sent through a branch of the MCG SRB on the SN side, such as split SRB1 on the branch of the SCG.
  • the SN sends the MCG failure message to the MN.
  • the MN may perform RRC reconfiguration on the terminal device, or instruct the terminal device to perform cell handover.
  • the MN can also release the terminal device.
  • the MN sends an RRC reconfiguration message or an RRC release message to the SN.
  • the MN can instruct the SN to send these messages to the terminal device through split SRB1 or SRB3.
  • the RRC reconfiguration message may include handover information to instruct the terminal equipment to perform access in the target cell #2.
  • the target cell #2 is a cell determined by the MN and may be different from the target cell #1.
  • the terminal device may carry a cell measurement report in the sent MCG failure message, and the MN may determine the target cell #2 based on the measurement report.
  • the MN involved in S450 is the source MN
  • the network device corresponding to the target cell #2 is the target network device, denoted as: target network device #2.
  • Target network device #2 and target network device #1 may be the same or different.
  • the source MN before the source MN sends an RRC reconfiguration message or an RRC release message to the SN, the source MN sends a handover request message to the target network device #2, and the target network device #2 feeds back a handover request response to the source MN
  • the message carries the RRC reconfiguration message from the target network device #2 to the terminal device.
  • the source MN sends the RRC reconfiguration message from the target network device #2 to the terminal device to the SN.
  • the MN If the MN decides to send an RRC release message to the terminal device, the MN sends the RRC release message to the SN.
  • the MN sends the RRC reconfiguration message or the RRC release message to the SN before the MN sends the SN release message to the SN.
  • the MN needs to send the SN release message to the SN only after the SN has fed back to the MN the RRC reconfiguration message sent by the MN to the SN or the RRC release message has been successfully sent to the terminal device.
  • the SN sends an RRC reconfiguration message or an RRC release message to the terminal device.
  • the SN can send these messages through split SRB1 or SRB3.
  • the SN sends the RRC reconfiguration message or the RRC release message from the MN to the SN to the UE.
  • the SN may further include: after the terminal device receives the RRC reconfiguration message sent by the SN, sending an RRC reconfiguration complete message to the target network device #2.
  • S460 The terminal device performs RRC reconstruction.
  • the RRC reconstruction process can be seen in FIG. 3, where the source network device in FIG. 3 corresponds to the source MN here, and the target network device corresponds to the target network device #1 here.
  • the terminal device when the selected cell belongs to the candidate cell, the terminal device performs access in the selected cell. Since the information of the candidate cell has been configured in advance by the MN, there is no need to send a measurement report or wait for a handover command before handover, which can improve the success rate of access to the selected cell. On the other hand, when the cell selected by the terminal device is not a candidate cell, the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to restore the wireless connection through the RRC reconfiguration or cell handover process, thereby avoiding the problem of the prior art RRC reconstruction.
  • the RRC reconfiguration process and the cell handover process will not cause the communication interruption and packet loss problems of the terminal equipment. Therefore, the method provided in this application avoids the problem of communication interruption or packet loss.
  • the RRC reconstruction process can avoid communication interruption and packet loss problems, thereby improving user experience.
  • FIG. 5 shows another communication method 500.
  • the method 500 corresponds to mechanism two.
  • the steps of the method shown in Fig. 5 will be described below.
  • S510 The MN sends configuration information to the terminal device. This step is the same as S410, please refer to S410.
  • S520 When the terminal device detects that the wireless connection fails, it determines whether the SCG fails to be detected. In S520, if no SCG failure is detected, S530 is executed. If it is detected that the SCG fails, S540 is executed.
  • the MN may instruct the terminal device whether to perform S540 when detecting SCG failure.
  • the MN may send fourth indication information to the terminal device, and the fourth indication information may be in any of the following forms:
  • the fourth indication information is used to indicate that the terminal device can access the candidate cell when it cannot send an MCG failure message to the MN through the SN.
  • the "cannot send an MCG failure message to the MN through the SN” means that the terminal device detects that the SCG fails.
  • the "can be accessed in a candidate cell” means that the terminal device can perform cell selection, and if the selected cell is a candidate cell, then perform access in the candidate cell.
  • the fourth indication information includes a fourth condition, and the fourth condition indicates that the terminal device can access in the candidate cell when the terminal device cannot send an MCG failure message to the MN through the SN and the fourth condition is met.
  • the fourth condition is indicated by the MN and stipulated by the protocol.
  • the terminal device cannot send an MCG failure message to the MN through the SN and the fourth condition is met, it can access in the candidate cell.
  • the fourth condition may be that there is a candidate cell whose signal quality is greater than the fifth threshold.
  • the fourth indication information includes the fourth condition, and the fourth indication information indicates that the terminal device can access in the candidate cell when the terminal device cannot send the MN failure message to the master node through the SN and the fourth condition is satisfied.
  • the MN indicates the fourth condition
  • the MN indicates that when the terminal device cannot send the MN failure message to the master node through the SN and the fourth condition is satisfied, it can access in the candidate cell.
  • the configuration information in S510, the third indication information described above, and the fourth indication information here may be carried through the same piece of signaling, or may be carried through different signaling, which is not limited in this application.
  • S530 The terminal device initiates an MCG quick recovery process.
  • the terminal device sends an SCG failure message to the MN through the SN, and initiates the MCG quick recovery procedure.
  • the terminal device may perform S540 and subsequent corresponding operations. For example, when the terminal device initiates the MCG quick recovery process, it can start a timer. If the terminal device has not received the RRC reconfiguration message or the RRC release message when the timer expires, the terminal device can perform S540 and subsequent corresponding operations.
  • the MN may instruct the terminal device to perform S540 and subsequent corresponding operations when it does not receive a response from the MN to the SCG failure message.
  • the MN can also be instructed through the foregoing fourth indication information, or the MN can be instructed through another message.
  • S540 The terminal device selects a cell.
  • the terminal device may use the S criterion for cell selection.
  • S criterion for cell selection.
  • S420 the description of the S criterion in S420.
  • the cell selection process performed by the terminal device may not be the cell selection performed during the RRC re-establishment process, and may also be the cell selection performed during the RRC re-establishment process.
  • the specific description is the same as that in S420.
  • S540 if the cell selected by the terminal device is a candidate cell, S550 is executed. Optionally, if the cell selected by the terminal device is not a candidate cell, S560 is executed.
  • S550 The terminal device accesses in the selected cell.
  • This step is the same as S430.
  • S430 For details, please refer to S430.
  • S560 The terminal device performs RRC reconstruction.
  • This step is the same as S460.
  • S460 For details, refer to S460.
  • the terminal device when a terminal device detects a wireless connection failure, on the one hand, when no SCG failure is detected, the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to go through the RRC reconfiguration or cell switching process To restore the wireless connection, thereby avoiding the RRC reconstruction in the prior art.
  • the terminal device when the SCG failure is detected, the terminal device can access the candidate cell when selecting the candidate cell, which further avoids the RRC reconstruction process in the prior art. Based on the above method, by avoiding the RRC reconstruction process in the prior art, communication interruption and packet loss problems can be avoided, thereby improving user experience.
  • FIG. 6 shows a communication method 600. The steps of the method 600 shown in FIG. 6 are described below.
  • S610 The terminal device receives configuration information sent by the MN. This step is the same as S410, please refer to S410.
  • S620 When the terminal device detects that the wireless connection fails, the terminal device determines whether there is a candidate cell that meets the sixth condition. If yes, perform S630; otherwise, that is, if the signal quality of no candidate cell meets the sixth condition, perform S640.
  • the sixth condition may be that the signal quality of the cell is greater than a certain threshold.
  • S630 The terminal device accesses in the target cell. It should be understood that the target cell here is a candidate cell that meets the sixth condition.
  • the access of the terminal equipment in the target cell is similar to the access of the terminal equipment in the target cell #1 in S430, which will not be repeated here.
  • S640 ⁇ S660 are the same as S440 ⁇ S460, so I won’t repeat them here.
  • a terminal device when a terminal device detects a wireless connection failure, if there is a candidate cell that meets a certain condition, it will access in the candidate cell, and if there is no candidate cell that meets the condition, it will be triggered by sending an MCG failure message MCG quick recovery process. Based on this method, the RRC reconstruction in the prior art can be avoided, so that the communication terminal and packet loss problems of the terminal device can be avoided.
  • the MN may send fifth indication information to the terminal device to instruct the terminal device to perform S630 if it is determined that there is a candidate cell that meets the sixth condition when the terminal device detects that the wireless connection fails.
  • the method may further include: the MN sends sixth indication information to the terminal device, where the sixth indication information is used to instruct the terminal device when there is no candidate cell that satisfies the sixth condition,
  • the MCG failure message can be sent to the MN through the SN.
  • FIG. 7 shows a communication method 700. The steps of the method 700 shown in FIG. 7 are described below.
  • S710 ⁇ S730 are the same as S510 ⁇ S530.
  • S740 The terminal device judges whether there is a candidate cell that meets the seventh condition.
  • the seventh condition may be that the signal quality of the cell is greater than a certain threshold.
  • the terminal device can determine the signal quality of the previously configured candidate cell. If the signal quality of a candidate cell is greater than the threshold, S750 is executed; otherwise (that is, the signal quality of no candidate cell meets the threshold greater than the threshold), S760 is executed.
  • the terminal device accesses in the target cell.
  • the target cell here is a candidate cell that satisfies the seventh condition.
  • This step is similar to S550, and you can refer to S550.
  • S760 The terminal device performs RRC reconstruction. This step is the same as S560.
  • the terminal device when the terminal device detects a wireless connection failure, on the one hand, when no SCG failure is detected, the terminal device sends an MCG failure message to the MN through the SN, which can trigger the MN to restore the wireless connection through the RRC reconfiguration or cell switching process , Thereby avoiding the RRC reconstruction in the prior art.
  • SCG failure when SCG failure is detected, if there are candidate cells that meet certain conditions, access can be made in candidate cells that meet the conditions, which further avoids the RRC reconstruction process in the prior art. Based on the above method, by avoiding the RRC reconstruction process, communication interruption and packet loss problems can be avoided, thereby improving user experience.
  • the present application also provides a communication method.
  • the method includes: the MN sends instruction information #1 to the terminal device.
  • the instruction information #1 is used to instruct the terminal device to select a cell when it detects a wireless connection failure. When a cell belongs to a candidate cell, access is performed in the selected cell.
  • the process of performing cell selection by the terminal device and performing access in the selected cell when the selected cell belongs to a candidate cell is referred to as the first process.
  • the indication information #1 may directly instruct the terminal device to execute the first process when it detects that the wireless connection fails.
  • the instruction information #1 is sent through CHO configuration information, or the instruction information #1 is CHO configuration information.
  • the indication information #1 is the CHO configuration information received by the terminal device last time.
  • the terminal device uses the CHO configuration information received last time to restore the wireless connection, instead of using the previously received CHO configuration information to restore the wireless connection.
  • the previously received CHO configuration information may configure the terminal device to recover the wireless connection by initiating the MCG quick recovery process when it detects that the wireless connection fails.
  • the indication information #1 may further include a condition, and the indication information #1 may instruct the terminal device to execute the first process when it detects that the wireless connection fails and the condition is met.
  • condition may be that there is a cell with a signal quality greater than the first threshold in the candidate cells, or the condition may be that the signal quality of the SN is less than or equal to the second threshold.
  • the terminal device may be configured with multiple mechanisms for wireless connection recovery at the same time.
  • the terminal device may execute multiple mechanisms for wireless connection recovery at the same time, which may cause other problems or the terminal
  • the device does not implement any wireless connection recovery mechanism, so the wireless connection cannot be recovered.
  • the MN can instruct the terminal device to select a cell when a wireless connection fails, and to access the selected cell when the selected cell is a candidate cell, so that the terminal device can be based on the MN’s instructions
  • the corresponding process is executed to restore the wireless connection, which avoids the above-mentioned problems in the prior art.
  • the MN can indicate the mechanism for wireless connection recovery to the terminal device according to its actual situation, which can improve flexibility.
  • This application also provides another communication method.
  • the method includes: the MN sends instruction information #2 to the terminal device, and the instruction information #2 is used to instruct the terminal device to detect a wireless connection failure, if no SCG failure is detected, Send MCG failure message to MN through SN.
  • the process of sending the MCG failure message to the MN through the SN is referred to as the second process.
  • the indication information #2 may directly instruct the terminal device to execute the second process when it detects that the wireless connection fails.
  • the instruction information #2 is sent through CHO configuration information, or the instruction information #2 is CHO configuration information.
  • the indication information #2 is the CHO configuration information received by the terminal device last time.
  • the terminal device uses the CHO configuration information received last time to restore the wireless connection, instead of using the previously received CHO configuration information to restore the wireless connection.
  • the previously received CHO configuration information may configure the terminal device to perform cell selection when detecting a wireless connection failure, and to perform access in the selected cell when the selected cell is a candidate cell.
  • the indication information #2 may further include a condition, and the second indication information may instruct the terminal device to execute the second process when the terminal device detects that the wireless connection fails and the condition is met.
  • the condition may be, for example, that the signal quality of the SN is greater than the fourth threshold.
  • the terminal device may be configured with multiple mechanisms for wireless connection recovery at the same time.
  • the terminal device may execute multiple mechanisms for wireless connection recovery at the same time, which may cause other problems or the terminal
  • the device does not implement any wireless connection recovery mechanism, so the wireless connection cannot be recovered.
  • the MN can instruct the terminal device to select a cell when a wireless connection fails, and to access the selected cell when the selected cell is a candidate cell, so that the terminal device can be based on the MN’s instructions
  • the corresponding process is executed to restore the wireless connection, which avoids the above-mentioned problems in the prior art.
  • the MN can indicate the mechanism for wireless connection recovery to the terminal device according to its actual situation, which can improve flexibility.
  • the protocol can also specify that when the terminal device is configured with multiple mechanisms at the same time for wireless connection recovery, the terminal device only executes one of the mechanisms. For example, when the terminal device detects that the wireless connection fails, the terminal device performs the following process: the terminal device selects a cell, and accesses in the selected cell when the selected cell is a candidate cell. If the selected cell is not in the selected cell When belonging to a candidate cell, the terminal equipment performs RRC reconstruction. Or the executed process is: the terminal device detects whether the SCG fails, and if the SCG fails, the terminal device performs RRC reconstruction. If the SCG does not fail, the terminal device sends an SCG failure message to the MN through the SN, and initiates the MCG quick recovery process.
  • the prior art proposes a condition increase or change or modification of the SN, that is, the MN or SN can use the CHO mechanism to configure the addition, change or modification of the SN.
  • the MN or SN sends the CHO configuration information to the terminal device when the source link quality is good.
  • the CHO configuration information may include the CHO trigger conditions added or changed or modified by the SN and the information of one or more candidate cells of the SN, where the candidate cell
  • the information may include the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (PCI) of the candidate cell and the frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI physical cell identifier
  • the terminal device After receiving the CHO configuration information added or changed or modified by the SN, the terminal device judges whether the candidate cell meets the CHO trigger condition according to the CHO configuration information, and uses a candidate cell that meets the CHO trigger condition as the target cell. Then, the terminal device performs a random access process with the determined target cell. When the random access is successfully completed, the terminal device sends an RRC message (such as an RRC reconfiguration complete message) to the target cell to notify the target cell that the condition switching is completed. In the CHO process, the terminal device does not need to send a measurement report of the SN signal quality, nor does it need to wait for a handover command to switch the cell corresponding to the SN, thereby improving the success rate of accessing the candidate cell.
  • an RRC message such as an RRC reconfiguration complete message
  • the terminal device suspends the transmission of the radio bearer in the SCG, and the terminal device can send an SCG failure message to the MN without triggering RRC reconstruction.
  • the MN can perform related processing. For example, the MN can change the SN or release the SN or modify the SN, and then the MN will send a response message to the terminal device.
  • the radio bearer migrates to another SN or migrates to the MN or is modified.
  • the terminal device restarts the transmission of the service corresponding to the previous bearer of the SCG (using the wireless configuration information in the response message). So for these services, there will be transmission interruptions.
  • This application proposes a communication method.
  • the terminal device can first determine the signal quality of the candidate cell. If the signal quality is good, the terminal device can directly switch to the candidate cell, and after switching to the candidate cell , Data communication can be performed directly in the candidate cell (using the wireless configuration information corresponding to the previous candidate cell) without first suspending the transmission carried in the SCG, which reduces the time of service interruption.
  • the solution will be described below with reference to FIG. 8.
  • Fig. 8 is a schematic flowchart of a communication method provided by the present application. The steps are described below.
  • S810 The MN or SN sends configuration information to the terminal device.
  • the configuration information may include information of one or more SN candidate cells.
  • the information of the candidate cell may include, for example, the cell global identifier (CGI) of the candidate cell, or the physical cell identifier (PCI) of the candidate cell and frequency information corresponding to the candidate cell.
  • CGI cell global identifier
  • PCI physical cell identifier
  • the configuration information may be CHO configuration information added or changed or modified by the SN.
  • S820 The terminal device detects that the SCG fails.
  • the detection mechanism of SCG failure is the same as S440.
  • S830 The terminal device judges whether there is a candidate cell that meets the eighth condition.
  • the candidate cell is a candidate cell of the SN in the CHO configuration information that is added or changed or modified by the SN sent by the MN or the SN to the terminal device.
  • the terminal device determines whether there is a candidate cell that meets the eighth condition. If yes, perform S840; otherwise, that is, if the signal quality of no candidate cell meets the eighth condition, perform S850.
  • the eighth condition may be that the signal quality of the cell is greater than a certain threshold.
  • S840 The terminal device accesses in the target cell. It should be understood that the target cell here is a candidate cell that meets the eighth condition.
  • the terminal device accesses in the target cell means that the terminal device sends an RRC reconfiguration complete message to the target cell.
  • the terminal device before sending the RRC reconfiguration message, it may be necessary to go through a random access process.
  • the terminal device may perform S850 and subsequent corresponding steps.
  • the base station to which the target cell belongs when the SN base station to which the target cell belongs is different from the previous SN base station of the terminal device, the base station to which the target cell belongs sends a message to the MN to notify the terminal device that the SN base station in the target cell has been accessed.
  • the terminal device when the terminal device successfully accesses the target cell, if the terminal device detects a wireless connection failure (refer to the description of wireless connection failure in step S420), the terminal device may send the MCG failure message through the SN to which the target cell belongs To MN. See S450a ⁇ S450e for specific steps.
  • S850 The terminal device sends SCG failure indication information to the MN.
  • the MN After the MN receives the SCG failure indication information, the MN can perform related processing, such as changing the SN or releasing the SN.
  • the method may further include: the MN sends instruction information to the terminal device, the instruction information instructing the terminal device to determine whether there is a candidate cell that meets the eighth condition when the SCG fails to be detected, and if so, then Access is performed in the candidate cell that meets the eighth condition.
  • the eighth condition may be carried in the instruction information, and this application does not limit the time.
  • the eighth condition can also be carried through CHO configuration information.
  • the indication information involved in this application may all be RRC messages, but this application does not limit this.
  • FIG. 9 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • the communication device 1000 may include a processing unit 1010 and a transceiving unit 1020.
  • the communication device 1000 may correspond to the terminal device in the foregoing method embodiment.
  • the communication apparatus 1000 may be used to perform operations performed by the terminal device in any of the foregoing embodiments.
  • the processing unit 1010 performs cell selection when it detects that the wireless connection fails; the processing unit 1010 is also configured to, if the target cell belongs to a candidate cell pre-configured by the master node MN, perform access in the target cell If the target cell does not belong to the candidate cell, and no secondary cell group SCG failure is detected, the transceiver unit 1020 is configured to send a primary cell group MCG failure message to the MN through the secondary node SN; wherein, the target cell The cell selected for the processing unit 1010 to perform cell selection.
  • the transceiver unit 1020 is further configured to send a radio resource control RRC reestablishment request message to the target cell.
  • the transceiver unit 1020 is further configured to: receive the first indication information sent by the MN;
  • the first indication information is used to instruct the processing unit 1010 to prioritize cell selection when detecting a wireless connection failure, and perform cell selection in the selected cell when the selected cell belongs to the candidate cell. Access, or,
  • the first indication information includes a first condition, and the first condition is used to instruct the processing unit 1010 to prioritize cell selection when it detects that the wireless connection fails and meets the first condition, and selects the cell in the selected cell. Access in the selected cell when belonging to the candidate cell, or,
  • the first indication information includes a first condition, and the first indication information is also used to instruct the processing unit 1010 to give priority to cell selection when it detects a wireless connection failure and meets the first condition, and selects When the cell of belongs to the candidate cell, access is performed in the selected cell.
  • the first condition includes one or more of the following: there is a cell with a signal quality greater than a first threshold in the candidate cells, or the signal quality of the SN is less than or equal to a second threshold.
  • the transceiver unit 1020 is further configured to: receive second indication information sent by the MN;
  • the second indication information is used to instruct the transceiver unit 1020 to send the MCG failure message to the MN through the SN when the cell selected by the processing unit 1010 does not belong to the candidate cell, or ,
  • the second indication information includes a second condition, and the second condition is used to indicate that when the cell selected by the processing unit 1010 does not belong to the candidate cell and the second condition is met, the transceiver unit 1020 may Sending the MCG failure message to the MN through the SN, or,
  • the second indication information includes a second condition, and the second indication information further indicates that when the cell selected by the processing unit 1010 does not belong to the candidate cell and the second condition is met, the transceiver unit 1020 may Sending the MCG failure message to the MN through the SN.
  • the second condition includes one or more of the following: the signal quality of the selected cell is less than a third threshold, or the signal quality of the SN is greater than a fourth threshold.
  • the transceiver unit 1020 is further configured to send all data to the MN through the SN. Said MCG failure message.
  • the wireless connection failure detected by the processing unit 1010 includes one or more of the following situations:
  • the MCG has a radio link failure
  • the MCG fails to switch
  • the processing unit 1010 fails the integrity check of the data packet received by the signaling radio bearer SRB1 or SRB2.
  • the processing unit 1010 detects that the wireless connection fails, the SCG failure of the secondary cell group is not detected, and the transceiver unit 1020 sends the primary cell group MCG failure message to the primary node MN through the secondary node SN; if the processing unit 1010 detects When the SCG fails, cell selection is performed; if the target cell is a candidate cell pre-configured by the MN, the processing unit 1010 performs access in the target cell, where the target cell is the processing unit 1010 The selected cell for cell selection.
  • the transceiver unit 1020 is further configured to send a radio resource control RRC reestablishment request message to the target cell.
  • the transceiver unit 1020 is further configured to receive third indication information sent by the MN;
  • the third indication information is used to indicate that when the processing unit 1010 detects a wireless connection failure, the transceiver unit 1020 may preferentially send the MCG failure message to the MN through the SN, or,
  • the third indication information includes a third condition, and the third condition is used to indicate that when the processing unit 1010 detects that the wireless connection fails and satisfies the third condition, the transceiver unit 1020 may preferentially communicate to the station through the SN.
  • the MN sends the MCG failure message, or,
  • the third indication information includes a third condition, and the third indication information is used to indicate that when the processing unit 1010 detects that the wireless connection fails and satisfies the third condition, the transceiver unit 1020 may preferentially pass the SN direction
  • the MN sends the MCG failure message.
  • the third condition includes: the signal quality of the SN is greater than or equal to a second threshold.
  • the transceiver unit 1020 is further configured to receive fourth indication information sent by the MN;
  • the fourth indication information is used to instruct the transceiver unit 1020 to process when the MCG failure message cannot be sent to the MN through the SN or the MN's response to the MCG failure message is not received
  • the unit 1010 may perform access in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth condition indicates that the transceiver unit 1020 cannot send the MCG failure message to the MN through the SN or has not received the failure of the MCG from the MN.
  • the processing unit 1010 may perform access in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth indication information indicates that the transceiver unit 1020 is unable to send the MCG failure message to the MN through the secondary SN or does not receive the response from the MN to the MN.
  • the processing unit 1010 may perform access in the candidate cell.
  • the fourth condition includes: the signal quality in the candidate cell is greater than or equal to a fifth threshold.
  • the wireless connection failure detected by the processing unit 1010 includes one or more of the following situations:
  • the MCG has a radio link failure
  • the MCG fails to switch
  • the processing unit 1010 fails the integrity check of the data packet received by the signaling radio bearer SRB1 or SRB2.
  • the communication device 1000 may correspond to the terminal device in the foregoing method embodiment, and the communication device 1000 may include a unit for executing the method executed by the terminal device in the foregoing method embodiment.
  • the units in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding processes in the above-mentioned method embodiments. It should be understood that the specific process for each unit to execute the corresponding steps in the foregoing method embodiment has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.
  • the communication device 1000 may correspond to the MN in the above method embodiment.
  • the communication device 1000 can be used to perform operations performed by the MN in any of the foregoing embodiments.
  • the processing unit 1010 is configured to generate first indication information; the transceiver unit 1020 is configured to send the first indication information to a terminal device;
  • the first indication information is used to indicate that the terminal device prioritizes cell selection when detecting a wireless connection failure, and when the selected cell belongs to a candidate cell, access in the selected cell ,or,
  • the first indication information includes a first condition, and the first condition is used to indicate that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and the selected cell belongs to In the candidate cell, access in the selected cell, or,
  • the first indication information includes a first condition, and the first indication information is also used to indicate that the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and selects the cell first.
  • the terminal device prioritizes cell selection when it detects that the wireless connection fails and satisfies the first condition, and selects the cell first.
  • the candidate cell is a cell pre-configured by the communication apparatus 1000 for the terminal device.
  • the first condition includes one or more of the following: there is a cell with a signal quality greater than a first threshold in the candidate cells, or the signal quality of the secondary node SN is less than or equal to a second threshold.
  • the processing unit 1010 is further configured to generate second indication information; the sending unit 1020 is further configured to send the second indication information to the terminal device; wherein, the second indication information is used to indicate the When the selected cell does not belong to the candidate cell, the terminal device may send a primary cell group MCG failure message to the communication device 1000 through the secondary node SN, or,
  • the second condition of the second indication information where the second condition is used to indicate that the terminal device can send information to the terminal device through the SN when the selected cell does not belong to the candidate cell and meets the second condition
  • the communication device 1000 sends the MCG failure message, or,
  • the second indication information includes a second condition, and the second indication information indicates that when the selected cell does not belong to the candidate cell and satisfies the second condition, the terminal device may send a notification to the terminal device through the SN.
  • the communication device 1000 sends the MCG failure message.
  • the second condition includes one or more of the following: the signal quality of the selected cell is less than a third threshold, or the signal quality of the SN is greater than or equal to a fourth threshold.
  • the processing unit 1010 is configured to generate third indication information; the sending unit 1020 is configured to send the third indication information to the terminal device; wherein, the third indication information is used to instruct the terminal device to When a wireless connection failure is detected, the primary cell group MCG failure message may be sent to the communication device 1000 through the secondary node SN first, or the third indication information includes a third condition, and the third condition is used to indicate the When the terminal device detects that the wireless connection fails and satisfies the third condition, it may preferentially send the MCG failure message to the communication device 1000 through the SN, or the third indication information includes the third condition, so The third indication information is used to indicate that the terminal device may preferentially send the MCG failure message to the communication device 1000 through the SN when the terminal device detects that the wireless connection fails and satisfies the third condition.
  • the third condition includes: the signal quality of the SN is greater than or equal to a second threshold.
  • the processing unit 1010 is further configured to generate fourth indication information; the sending unit 1020 is further configured to send the fourth indication information to the terminal device;
  • the fourth indication information is used to indicate that the terminal device cannot send the MCG failure message to the communication apparatus 1000 through the SN or has not received a response from the communication apparatus 1000 to the MCG failure message When, you can access in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth condition indicates that the terminal device cannot send the MCG failure message to the communication device 1000 through the SN or has not received the communication device 1000 to the communication device 1000.
  • the response to the MCG failure message is met and the fourth condition is met, access can be performed in the candidate cell, or,
  • the fourth indication information includes a fourth condition, and the fourth indication information indicates that the terminal device cannot send the MCG failure message to the communication apparatus 1000 through the secondary SN or fails to receive the communication apparatus 1000.
  • the fourth condition when the fourth condition is satisfied, access can be performed in the candidate cell;
  • the candidate cell is a cell pre-configured by the communication apparatus 1000 for the terminal device.
  • the fourth condition includes: the signal quality in the candidate cell is greater than or equal to a fifth threshold.
  • the communication device 1000 may correspond to the MN in the foregoing method embodiment, and the communication device 1000 may include a unit for executing the method executed by the MN in the foregoing method embodiment.
  • each unit in the communication device 1000 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding processes in the above-mentioned method embodiments. It should be understood that the specific process for each unit to execute the corresponding steps in the foregoing method embodiment has been described in detail in the foregoing method embodiment, and is not repeated here for brevity.
  • the transceiver unit 1020 in the communication device 1000 may be an input/output interface.
  • FIG. 10 is a schematic structural diagram of a network device provided by an embodiment of the present application, for example, it may be a schematic structural diagram of a base station.
  • the network device can implement the function of the MN in the above method embodiment.
  • the network device 1100 may include one or more DU 1101 and one or more CU 1102.
  • the CU1102 can communicate with the next-generation core network (NG core, NC).
  • the DU 1101 may include at least one antenna 11011, at least one radio frequency unit 11012, at least one processor 11013, and at least one memory 11014.
  • the DU 1101 part is mainly used for the transmission and reception of radio frequency signals, the conversion of radio frequency signals and baseband signals, and part of baseband processing.
  • the CU1102 may include at least one processor 11022 and at least one memory 11021.
  • CU1102 and DU1101 can communicate through interfaces, where the control plane interface can be Fs-C, such as F1-C, and the user plane interface can be Fs-U, such as F1-U.
  • the control plane interface can be Fs-C, such as F1-C
  • the user plane interface can be Fs-U, such as F1-U.
  • the CU 1102 part is mainly used to perform baseband processing, control the base station, and so on.
  • the DU 1101 and the CU 1102 may be physically set together, or may be physically separated, that is, a distributed base station.
  • the CU 1102 is the control center of the base station, which may also be referred to as a processing unit, and is mainly used to complete the baseband processing function.
  • the CU 1102 may be used to control the base station to execute the operation procedure of the MN in the foregoing method embodiment.
  • the baseband processing on the CU and DU can be divided according to the protocol layer of the wireless network, for example, the packet data convergence protocol (PDCP) layer and the functions of the above protocol layers are set in the CU, the protocol layer below PDCP, For example, the functions of one or more protocol layers in the radio link control (RLC) layer and the medium access control (MAC) layer are set in the DU.
  • CU implements radio resource control (radio resource control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP) layer functions
  • DU implements radio link control (radio link control, RLC), MAC, and physical functions.
  • the function of the (physical, PHY) layer for example, the packet data convergence protocol (PDCP) layer and the functions of the above protocol layers are set in the CU, the protocol layer below PDCP.
  • RLC radio link control
  • MAC medium access control
  • CU implements radio resource control (radio link control, RRC), packet data convergence protocol (packet data convergence protocol, PDCP
  • the network device 1100 may include one or more radio frequency units (RU), one or more DUs, and one or more CUs.
  • the DU may include at least one processor 11013 and at least one memory 11014
  • the RU may include at least one antenna 11011 and at least one radio frequency unit 11012
  • the CU may include at least one processor 11022 and at least one memory 11021.
  • the CU1102 may be composed of one or more single boards, and multiple single boards may jointly support a wireless access network (such as a 5G network) with a single access indication, or may respectively support wireless access networks of different access standards.
  • Access network such as LTE network, 5G network or other networks.
  • the memory 11021 and the processor 11022 may serve one or more boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • the DU1101 can be composed of one or more single boards.
  • Multiple single boards can jointly support a wireless access network with a single access indication (such as a 5G network), and can also support wireless access networks with different access standards (such as a 5G network).
  • the memory 11014 and the processor 11013 may serve one or more boards. In other words, the memory and the processor can be set separately on each board. It can also be that multiple boards share the same memory and processor. In addition, necessary circuits can be provided on each board.
  • FIG. 11 is a schematic structural diagram of a terminal device 1200 provided by an embodiment of the present application.
  • the terminal device 1200 can perform the functions of the terminal device in the foregoing method embodiment.
  • the terminal device 1200 includes a processor 1210 and a transceiver 1220.
  • the terminal device 1200 further includes a memory 1230.
  • the processor 1210, the transceiver 1220, and the memory 1230 can communicate with each other through an internal connection path to transfer control and/or data signals.
  • the memory 1230 is used to store computer programs, and the processor 1210 is used to download from the memory 1230. Call and run the computer program to control the transceiver 1220 to send and receive signals.
  • the terminal device 1200 may further include an antenna 1240 for transmitting uplink data or uplink control signaling output by the transceiver 1220 through a wireless signal.
  • the foregoing processor 1210 and the memory 1230 may be combined into a processing device, and the processor 1210 is configured to execute the program code stored in the memory 1230 to implement the foregoing functions.
  • the memory 1230 may also be integrated in the processor 1210 or independent of the processor 1210.
  • the processor 1210 may correspond to the processing unit in FIG. 16.
  • the above transceiver 1220 may correspond to the transceiver unit in FIG. 9 and may also be referred to as a transceiver unit.
  • the transceiver 1220 may include a receiver (or called a receiver, a receiving circuit) and a transmitter (or called a transmitter, a transmitting circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.
  • the terminal device 1200 shown in FIG. 11 can implement various processes related to the terminal device in the foregoing method embodiments.
  • the operations and/or functions of each module in the terminal device 1200 are respectively for implementing the corresponding processes in the foregoing method embodiments.
  • the above-mentioned processor 1210 may be used to perform the actions described in the foregoing method embodiments that are implemented internally by the terminal device, and the transceiver 1220 may be used to perform the actions described in the foregoing method embodiments that the terminal device sends to or receives from the MN.
  • the transceiver 1220 may be used to perform the actions described in the foregoing method embodiments that the terminal device sends to or receives from the MN.
  • the aforementioned terminal device 1200 may further include a power supply 1250 for providing power to various devices or circuits in the terminal device.
  • the terminal device 1200 may also include one or more of an input unit 1260, a display unit 1270, an audio circuit 1280, a camera 1290, and a sensor 1310.
  • the audio circuit One or more of a speaker 1282, a microphone 1284, and the like may also be included.
  • An embodiment of the present application also provides a processing device, including a processor and an interface; the processor is configured to execute the method in the foregoing method embodiment.
  • the aforementioned processing device may be one or more chips.
  • the processing device may be a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on chip (SoC), or It is a central processor unit (CPU), it can also be a network processor (NP), it can also be a digital signal processing circuit (digital signal processor, DSP), or it can be a microcontroller (microcontroller unit). , MCU), it can also be a programmable logic device (PLD) or other integrated chips.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processor unit
  • NP network processor
  • DSP digital signal processing circuit
  • microcontroller unit microcontroller unit
  • MCU programmable logic device
  • PLD programmable logic device
  • each step of the above method can be completed by an integrated logic circuit of hardware in the processor or instructions in the form of software.
  • the steps of the method disclosed in the embodiments of the present application may be directly embodied as being executed and completed by a hardware 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, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware. To avoid repetition, it will not be described in detail here.
  • the processor in the embodiment of the present application may be an integrated circuit chip with signal processing capability.
  • the steps of the foregoing method embodiments can be completed by hardware integrated logic circuits in the processor or instructions in the form of software.
  • the above-mentioned processor may be a general-purpose processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (ASIC), a field programmable gate array (field programmable gate array, FPGA) or other Programming logic devices, discrete gates or transistor logic devices, discrete hardware components.
  • the memory in the embodiments of the present application may be a volatile memory or a non-volatile memory, or may include both volatile and non-volatile memory.
  • the non-volatile memory can be read-only memory (ROM), programmable read-only memory (programmable ROM, PROM), erasable programmable read-only memory (erasable PROM, EPROM), and electrically available Erase programmable read-only memory (electrically EPROM, EEPROM) or flash memory.
  • the volatile memory may be random access memory (RAM), which is used as an external cache.
  • RAM random access memory
  • static random access memory static random access memory
  • dynamic RAM dynamic RAM
  • DRAM dynamic random access memory
  • synchronous dynamic random access memory synchronous DRAM, SDRAM
  • double data rate synchronous dynamic random access memory double data rate SDRAM, DDR SDRAM
  • enhanced synchronous dynamic random access memory enhanced SDRAM, ESDRAM
  • synchronous connection dynamic random access memory serial DRAM, SLDRAM
  • direct rambus RAM direct rambus RAM
  • the present application also provides a computer-readable medium on which a computer program is stored, and when the computer program is executed by a computer, the function of any of the foregoing method embodiments is realized.
  • This application also provides a computer program product, which, when executed by a computer, realizes the functions of any of the foregoing method embodiments.
  • the computer may be implemented in whole or in part by software, hardware, firmware, or any combination thereof.
  • software it can be implemented in the form of a computer program product in whole or in part.
  • the computer program product includes one or more computer instructions.
  • the computer 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.
  • 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 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 high-density digital video disc (digital video disc, DVD)), or a semiconductor medium (for example, a solid state disk, SSD)) etc.
  • system and “network” in this article are often used interchangeably in this article.
  • network in this article is only an association relationship describing the associated objects, which means that there can be three relationships, for example, A and/or B, which can mean: A alone exists, A and B exist at the same time, exist alone B these three situations.
  • At least one of! or "at least one of" as used herein means all or any combination of the listed items, for example, “at least one of A, B and C", It can be expressed that: A alone exists, B alone exists, C exists alone, A and B exist at the same time, B and C exist at the same time, and there are six situations of A, B and C at the same time.
  • B corresponding to A means that B is associated with A, and B can be determined according to A.
  • determining B based on A does not mean that B is determined only based on A, and B can also be determined based on A and/or other information.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are merely illustrative, for example, the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components may be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection 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 the present 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 implemented 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 the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including Several instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present 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. .

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Abstract

本申请提供了一种通信方法和通信装置，当终端设备检测到无线连接失败时，终端设备进行小区选择；若目标小区属于主MN预配置的候选小区，终端设备在选择所选择到的小区中进行接入；若选择所选择到的小区不属于候选小区，且没有检测到辅SCG失败，终端设备通过SN向MN发送主小区组MCG失败消息，以发起MCG快速恢复流程进行无线连接恢复，避免了RRC重建。

Description

通信方法和通信装置 技术领域
本申请涉及通信领域，并且更具体地，涉及一种通信方法和通信装置
背景技术
目前有很多因素会引起无线资源控制(radio resource control，RRC)重建流程，比如：主小区组(master cell group，MCG)发生了无线链路失败(radio link failure，RLF)，或者MCG发生切换失败，或者RRC重配失败。然而，RRC重建会导致终端设备通信的中断，因此应尽量避免RRC重建。
发明内容
本申请提供一种通信方法和通信装置，能够尽量避免RRC重建。
第一方面，提供了一种通信方法，包括：当终端设备检测到无线连接失败时，所述终端设备进行小区选择；若目标小区属于主节点(master node，MN)预配置的候选小区，所述终端设备在所述目标小区中进行接入；若所述目标小区不属于所述候选小区，且没有检测到辅小区组(secondary cell group，SCG)失败，所述终端设备通过(secondary node，SN)向所述MN发送主小区组MCG失败消息；其中，所述目标小区为所述终端设备进行小区选择所选择到的小区。
应理解，所述候选小区为一个或多个。
其中，所述SCG为一组与SN关联的小区，可以包括主辅小区PSCell(primary secondary cell)，还可以包括一个或多个辅小区SCell(secondary cell)。其中，所述小区为服务小区。在本申请中，服务小区为所述终端设备提供服务的小区。
所述MCG为一组与MN关联的小区，可以包括主小区PCell(primary cell)，还可以包括一个或多个辅小区SCell(secondary cell)。其中，所述小区为服务小区。
其中，所述主辅小区和主小区可以统称为特殊小区(SpCell)。
在非双连接DC场景中，特殊小区可以指主小区。
MN配置候选小区是指，MN将候选小区的信息配置给终端设备，候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，包括候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备基于候选小区的信息，可以接入候选小区。
可选地，在所述终端设备进行小区选择之前，该方法还可以包括：终端设备接收MN发送的条件切换(conditional handover，CHO)配置信息，所述CHO配置信息用于配置所述候选小区。
也就是说，所述候选小区是MN通过CHO配置信息预配置的。所述CHO配置信息的具体形式可以参见现有技术。
可选地，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：所述MCG发生无线链路失败；所述MCG发生切换失败；无线资源控制RRC重配失败；或，所述终端设备对信令无线承载(signaling radio bearer，SRB)1或SRB2接收到的数据包进行完整性校验失败。
传统的切换流程中，测量报告或者切换命令的发送都可能导致切换失败。而在该机制中，终端设备在所选择的小区属于候选小区时，在该所选择的小区中进行接入。由于候选小区的信息已经由MN提前配置，因此不需要发送测量报告也不需要等待切换命令才切换，从而能够提高接入到选择的小区的成功率。另一方面，在终端设备所选择的小区不是候选小区时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。相比于现有技术中的RRC重建过程可能导致的通信中断或者丢包问题，RRC重配过程和小区切换过程不会导致终端设备的通信中断以及丢包问题，因此本申请提供的方法通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：若所述目标小区不属于所述候选小区，且检测到所述SCG失败，所述终端设备向所述目标小区发送无线资源控制RRC重建请求消息。
基于该方案，终端设备可以通过发送RRC重建请求消息发起RRC重建过程，从而可以恢复无线连接。
结合第一方面，在第一方面的某些实现方式中，所述方法还包括：若所述终端设备在所述目标小区中进行的接入失败，且没有检测到所述SCG失败，所述终端设备通过所述SN向所述MN发送所述MCG失败消息。
基于该方案，在目标小区中进行的接入失败时，终端设备可以通过所SN向MN发送MCG失败消息以发起MCG快速恢复流程进行无线连接恢复，避免了RRC重建。
结合第一方面，在第一方面的某些实现方式中，在所述终端设备进行小区选择之前，所述方法还包括：所述终端设备接收所述MN发送的第一指示信息。
其中，所述第一指示信息用于指示所述终端设备在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一条件用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一指示信息还用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入。
可选地，第一指示信息可以是无线资源控制(radio resource control，RRC)消息，但本申请对此不作限定。
该方案中，MN通过第一指示信息向终端设备指示终端设备在检测到无线连接失败时需要进行何种操作，终端设备可以根据MN的指示进行相应操作，从而能够避免终端设备在检测到无线连接失败时，由于没有进行合理的操作而导致的通信终端问题。
可选地，所述第一条件包括以下中的一项或多项：所述候选小区中存在信号质量大于或等于第一阈值的小区，或者，所述SN的信号质量小于或等于第二阈值。
基于该方案，终端设备通过在信号质量大于或等于一定阈值时，在目标小区中进行接入，可以提高接入成功率。另外，在SN的信号质量小于或等于一定阈值时，终端设备向SN发送的消息SN可能不能成功接收，因此相比于终端设备通过SN向MN发送MCG失败消息尝试恢复无线连接的方式，通过小区选择尝试接入候选小区来进行无线连接恢复更合理一些。
结合第一方面，在第一方面的某些实现方式中，在所述终端设备通过所述SN向所述MN发送主小区组MCG失败消息之前，所述方法还包括：所述终端设备接收所述MN发送的第二指示信息。
其中，所述第二指示信息用于指示所述终端设备在所选择到的小区不属于所述候选小区时，通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第二指示信息包括第二条件，所述第二条件用于指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第二指示信息包括第二条件，所述第二指示信息还指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述MCG失败消息。
可选地，第二指示信息可以是RRC消息，但本申请对此不作限定。
基于该方案，终端设备可以根据MN的指示，在所选择到的小区不属于所述候选小区时，进行相应操作，从而可以避免一些不合理的操作带来的通信中断延长等问题。
可选地，所述第二条件包括以下中的一项或多项：所述所选择到的小区的信号质量小于或等于第三阈值，或者，所述SN的信号质量大于或等于第四阈值。
在目标小区的信道质量小于或等于一定阈值时，终端设备成功接入目标小区的概率较小，因此终端设备更适合通过SN向MN发送所述MCG失败消息来进行无线连接恢复。另外，在SN的信号质量大于或等于一定阈值时，终端设备与SN之间的通信质量较好，因此终端设备可以通过SN向MN发送MCG失败消息，以尝试恢复无线连接。
第二方面，提供了一种通信方法，其特征在于，包括：主节点MN生成第一指示信息；所述MN向终端设备发送所述第一指示信息。
其中，所述第一指示信息用于指示所述终端设备在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于候选小区时，在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一条件用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时，在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一指示信息还用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时，在所述所选择的小区中进行接入，
所述候选小区为所述MN为所述终端设备预配置的小区。
应理解，所述候选小区为一个或多个。
可选地，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：所述MCG发生无线链路失败；所述MCG发生切换失败；无线资源控制RRC重配失败；或，所述终端设备对SRB1或SRB2接收到的数据包进行完整性校验失败。
MN配置候选小区是指，MN将候选小区的信息配置给终端设备，候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，包括候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备基于候选小区的信息，可以接入候选小区。
可选地，在所述MN向终端设备发送所述第一指示信息之前，所述方法还包括：所述MN向终端设备发送CHO配置信息，所述CHO配置信息用于配置所述候选小区。
MN通过第一指示信息向终端设备指示终端设备在检测到无线连接失败时需要进行何种操作，终端可以根据MN的指示进行相应操作，从而能够避免终端设备在检测到无线连接失败时，由于没有进行合理的无线连接恢复而导致的通信终端问题。
可选地，所述第一条件包括以下中的一项或多项：所述候选小区中存在信号质量大于或等于第一阈值的小区，或者，辅节点SN的信号质量小于或等于第二阈值。
结合第二方面，在第二方面的某些实现方式中，该方法还可以包括：所述MN生成第二指示信息；所述MN向所述终端设备发送所述第二指示信息。
其中，所述第二指示信息用于指示所述终端设备在所选择到的小区不属于所述候选小区时，通过辅节点SN向所述MN发送主小区组MCG失败消息，或者，
所述第二指示信息第二条件，所述第二条件用于指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第二指示信息包括第二条件，所述第二指示信息指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述MCG失败消息。
基于该方案，MN通过指示终端设备在选择到的小区不属于所述候选小区时，可以通过SN向MN发送MCG失败消息，使得终端设备可基于MCG快速恢复流程恢复无线链路，避免使用RRC重建。
可选地，所述第二条件包括以下中的一项或多项：为所述所选择到的小区的信号质量小于或等于第三阈值，或者，所述SN的信号质量大于或等于第四阈值。
第三方面，提供了一种通信方法，包括：当终端设备检测到无线连接失败时，若没有检测到辅小区组SCG失败，所述终端设备通过辅节点SN向主节点MN发送主小区组MCG失败消息；若检测到所述SCG失败，所述终端设备进行小区选择；若目标小区属于所述MN预配置的候选小区，所述终端设备在所述目标小区中进行接入，其中，所述目标小区为所述终端设备进行小区选择所选择到的小区。其中，SCG为与SN关联的一组小区，MCG为与MN关联的一组小区
应理解，所述候选小区为一个或多个。
可选地，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：所述MCG发生无线链路失败；所述MCG发生切换失败；无线资源控制RRC重配失败；或，所述终端设备对SRB1或SRB2中的一项或多项接收到的数据包进行完整性校验失败。
MN配置候选小区是指，MN将候选小区的信息配置给终端设备，候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，包括候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备基于候选小区的信息，可以接入候选小区。
根据本申请提供的方法，当终端设备检测到无线连接失败时，一方面，在没有检测到SCG失败时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。另一方面，在检测到SCG失败时，终端设备在选择到候选小区时，可以在候选小区中进行接入，进一步避免了现有技术中的RRC重建流程。基于上述方法，通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：若所述目标小区不属于所述候选小区，所述终端设备向所述目标小区发送无线资源控制RRC重建请求消息。
基于该方案，可以通过RRC重建恢复无线连接。
结合第三方面，在第三方面的某些实现方式中，所述方法还包括：若所述终端设备没有接收到MN对MCG失败消息的响应，所述终端设备进行小区选择，并在所选择的小区属于所述MN预配置的候选小区时，所述终端设备在所选择的小区中进行接入。
基于该方案，在终端设备通过发送MCG失败消息发起的MCG快速恢复流程失败时，终端设备可以尝试在候选小区中进行接入，避免进行RRC重建。
结合第三方面，在第三方面的某些实现方式中，在所述终端设备通过辅节点SN向主节点MN发送主小区组MCG失败消息之前，所述方法还包括：所述终端设备接收所述MN发送的第三指示信息。
其中，所述第三指示信息用于指示所述终端设备在检测到无线连接失败时，优先通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第三指示信息包括第三条件，所述第三条件用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，优先通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第三指示信息包括第三条件，所述第三指示信息用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，优先通过所述SN向所述MN发送所述MCG失败消息。
可选地，第三指示信息可以是RRC消息，但本申请对此不作限定。
该方案中，MN通过第三指示信息向终端设备指示终端设备在检测到无线连接失败时需要进行何种操作，终端设备可以根据MN的指示进行相应操作，从而能够避免终端设备在检测到无线连接失败时，由于没有进行合理的操作而导致的通信终端问题。
可选地，所述第三条件包括：所述SN的信号质量大于或等于第二阈值。
在SN的信号质量大于一定阈值时，终端设备与SN之间的通信质量较好，因此终端设备可以通过SN向MN发送MCG失败消息，以尝试恢复无线连接。
结合第三方面，在第三方面的某些实现方式中，在所述终端设备在所述目标小区中进行接入之前，所述方法还包括：所述终端设备接收所述MN发送的第四指示信息。
其中，所述第四指示信息用于指示所述终端设备在不能通过所述SN向所述MN发送 所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，在所述候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四条件指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件时，在所述候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四指示信息指示所述终端设备在不能通过所述辅SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件成立时，在所述候选小区中进行接入。
可选地，第四指示信息可以是RRC消息，但本申请对此不作限定。
基于该方案，终端设备可以根据MN的指示，在不能通过SN向MN发送MCG失败消息或者没有收到MN对MCG失败消息的响应时，进行相应操作，从而可以避免一些不合理的操作带来的通信中断延长等问题。
可选地，所述第四条件包括：所述候选小区中存在信号质量大于或等于第五阈值的小区。
终端设备通过在信号质量大于一定阈值时，在目标小区中进行接入，可以提高接入成功率。
第四方面，提供了一种通信方法，包括：主节点MN生成第三指示信息；所述MN向终端设备发送所述第三指示信息；其中，所述第三指示信息用于指示终端设备在检测到无线连接失败时，可以优先通过辅节点SN向所述MN发送主小区组MCG失败消息，或者，所述第三指示信息包括第三条件，所述第三条件用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，可以优先通过所述SN向所述MN发送所述MCG失败消息，或者，所述第三指示信息包括第三条件，所述第三指示信息用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，可以优先通过所述SN向所述MN发送所述MCG失败消息。
根据本申请提供的方法，MN通过第三指示信息向终端设备指示终端设备在检测到无线连接失败时需要进行何种操作，终端可以根据MN的指示进行相应操作，从而能够避免终端设备在检测到无线连接失败时，由于没有进行合理的无线连接恢复而导致的通信终端问题。
可选地，所述第三条件包括：所述SN的信号质量大于或等于第二阈值。
结合第四方面，在第四方面的某些实现方式中，所述MN生成第四指示信息；
所述MN向所述终端设备发送所述第四指示信息；其中，所述第四指示信息用于指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，可以在候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四条件指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件时，可以在所述候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四指示信息指示所述终端设备在不能通过所述辅SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件成立时，可以在所述候选小区中进行接入；
所述候选小区为所述MN为所述终端设备预配置的小区。
基于该方法，终端设备可以优先在候选小区中接入，避免了直接进行RRC重建。
可选地，所述第四条件包括：所述候选小区中存在信号质量大于或等于第五阈值。
第五方面，提供了一种通信方法，包括：当终端设备检测到无线连接失败时，若存在满足第六条件的候选小区，所述终端设备在目标小区中进行接入，所述目标小区为满足所述第六条件的候选小区，所述候选小区为主节点MN预配置的小区；若不存在满足所述第六条件的候选小区，且没有检测到辅小区组SCG失败，所述终端设备通过辅节点SN向所述MN发送主小区组MCG失败消息。
MN配置候选小区是指，MN将候选小区的信息配置给终端设备，候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，包括候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备基于候选小区的信息，可以接入候选小区。
可选地，在所述终端设备在目标小区中进行接入之前，该方法还可以包括：终端设备接收MN发送的CHO配置信息，所述CHO配置信息用于配置所述候选小区。
也就是说，所述候选小区是MN通过CHO配置信息预配置的。所述CHO配置信息的具体形式可以参见现有技术。
可选地，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：所述MCG发生无线链路失败；所述MCG发生切换失败；无线资源控制RRC重配失败；所述终端设备对信令无线承载(signaling radio bearer，SRB)1和SRB2接收到的数据包进行完整性校验失败。
传统的切换流程中，测量报告或者切换命令的发送都可能导致切换失败。而在该机制中，终端设备在所选择的小区属于候选小区时，在该所选择的小区中进行接入。由于候选小区的信息已经由MN提前配置，因此不需要发送测量报告也不需要等待切换命令才切换，从而能够提高接入到选择的小区的成功率。另一方面，在终端设备所选择的小区不是候选小区时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。相比于现有技术中的RRC重建过程可能导致的通信中断或者丢包问题，RRC重配过程和小区切换过程不会导致终端设备的通信中断以及丢包问题，因此本申请提供的方法通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
可选地，所述第六条件包括：小区的信号质量大于或等于一定门限。
在小区的信号质量大于一定门限时，终端设备成功接入小区的概率较大，因此终端设备可以尝试在目标小区中进行接入。
结合第五方面，在第五方面的某些实现方式中，所述方法还包括：若不存在满足所述第六条件的候选小区，且检测到所述SCG失败，所述终端设备向所述目标小区发送无线资源控制RRC重建请求消息。
基于该方案，终端设备可以通过发送RRC重建请求消息发起RRC重建过程，从而可以恢复无线连接。
结合第五方面，在第五方面的某些实现方式中，所述方法还包括：若所述终端设备在所述目标小区中进行的接入失败，且没有检测到所述SCG失败，所述终端设备通过所述 SN向所述MN发送所述MCG失败消息。
基于该方案，在目标小区中进行的接入失败时，终端设备可以通过所SN向MN发送MCG失败消息以发起MCG快速恢复流程进行无线连接恢复，避免了RRC重建。
结合第五方面，在第五方面的某些实现方式中，在所述所述终端设备在目标小区中进行接入之前，所述方法还包括：所述终端设备接收所述MN发送的第五指示信息；其中，所述第五指示信息用于指示所述终端设备在检测到无线连接失败时，优先判断是否存在满足所述第六条件的候选小区，并且在存在满足所述第六条件的候选小区时，在满足所述第六条件的候选小区中进行接入。
可选地，第五指示信息可以是RRC消息，但本申请对此不作限定。
结合第五方面，在第五方面的某些实现方式中，在所述终端设备通过辅节点SN向所述MN发送主小区组MCG失败消息之前，所述方法还包括：所述终端设备接收所述MN发送的第六指示信息；其中，所述第六指示信息用于指示所述终端设备在不存在满足所述第六条件的候选小区时，可以通过所述SN向所述MN发送所述MCG失败消息。
结合第五方面，在第五方面的某些实现方式中，所述方法还包括：若所述终端设备在所述目标小区中进行的接入失败，且没有检测到所述SCG失败，所述终端设备通过所述SN向所述MN发送所述MCG失败消息。
基于该方案，在目标小区中进行的接入失败时，终端设备可以通过所SN向MN发送MCG失败消息以发起MCG快速恢复流程进行无线连接恢复，避免了RRC重建。
第六方面，一种通信方法，包括：主节点MN生成第五指示信息；所述MN向终端设备发送所述第五指示信息。其中，所述第五指示信息用于指示所述终端设备在检测到无线连接失败时，优先判断是否存在满足第六条件的候选小区，并且在存在满足所述第六条件的候选小区时，在满足所述第六条件的候选小区中进行接入，所述候选小区为所述MN为所述终端设备预配置的小区。
MN通过第五指示信息向终端设备指示终端设备在检测到无线连接失败时需要进行何种操作，终端可以根据MN的指示进行相应操作，从而能够避免终端设备在检测到无线连接失败时，由于没有进行合理的无线连接恢复而导致的通信终端问题。
可选地，第六条件包括：小区的信号质量大于或等于一定门限。
可选地，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：所述MCG发生无线链路失败；所述MCG发生切换失败；无线资源控制RRC重配失败；或者，所述终端设备对SRB1或SRB2中的任一项接收到的数据包进行完整性校验失败。
结合第六方面，在第六方面的某些实现方式中，所述方法还包括：MN生成第六指示信息；所述MN向终端设备发送所述第六指示信息，所述第六指示信息用于指示所述终端设备在不存在满足所述第六条件的候选小区时，可以通过SN向所述MN发送MCG失败消息。
基于该方案，MN通过指示终端设备在不存在满足所述第六条件的候选小区时，可以通过SN向MN发送MCG失败消息，使得终端设备可基于MCG快速恢复流程恢复无线链路，避免使用RRC重建。
第七方面，提供了一种通信方法，包括：当终端设备检测到无线连接失败时，若没有 检测到辅小区组SCG失败，所述终端设备通过辅节点SN向主节点MN发送主小区组MCG失败消息；在检测到所述SCG失败时，若存在满足第七条件的候选小区，所述终端设备在目标小区中进行接入，所述目标小区为满足所述第七条件的候选小区，所述候选小区为主节点MN预配置的小区。
应理解，所述候选小区为一个或多个。
可选地，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：所述MCG发生无线链路失败；所述MCG发生切换失败；无线资源控制RRC重配失败；或者，所述终端设备对SRB1或SRB2接收到的数据包进行完整性校验失败。
MN配置候选小区是指，MN将候选小区的信息配置给终端设备，候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，包括候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备基于候选小区的信息，可以接入候选小区。
根据本申请提供的方法，当终端设备检测到无线连接失败时，一方面，在没有检测到SCG失败时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。另一方面，在检测到SCG失败时，终端设备在存在满足第七条件的候选小区时，可以在候选小区中进行接入，进一步避免了现有技术中的RRC重建流程。基于上述方法，通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
可选地，第七条件包括：小区的信号质量大于或等于一定门限。
小区信号质量大于或等于一定门限时，可以提高接入成功率。因此，相比于进行RRC重建，合理的操作是终端设备在信号质量大于或等于一定门限的候选小区进行接入。结合第七方面，在第七方面的某些实现方式中，所述方法还包括：若存在满足第七条件的候选小区，所述终端设备向所述目标小区发送无线资源控制RRC重建请求消息。
结合第七方面，在第七方面的某些实现方式中，所述方法还包括：若所述终端设备没有接收到MN对MCG失败消息的响应，所述终端设备在存在满足第七条件的候选小区时在满足第七条件的候选小区中进行接入。
基于该方案，在终端设备通过发送MCG失败消息发起的MCG快速恢复流程失败时，终端设备可以尝试在候选小区中进行接入，避免进行RRC重建。
结合第七方面，在第七方面的某些实现方式中，在所述终端设备通过辅节点SN向主节点MN发送主小区组MCG失败消息之前，所述方法还包括：所述终端设备接收所述MN发送的第七指示信息；其中，所述第七指示信息用于指示所述终端设备在检测到无线连接失败时，可以优先通过所述SN向所述MN发送所述MCG失败消息。
可选地，第七指示信息可以是RRC消息，但本申请对此不作限定。
该方案中，MN通过第七指示信息向终端设备指示终端设备在检测到无线连接失败时需要进行何种操作，终端设备可以根据MN的指示进行相应操作，从而能够避免终端设备在检测到无线连接失败时，由于没有进行合理的操作而导致的通信终端问题。
结合第七方面，在第七方面的某些实现方式中，在所述终端设备在所述目标小区中进行接入之前，所述方法还包括：所述终端设备接收所述MN发送的第八指示信息；其中，所述第八指示信息用于指示所述终端设备在不能通过所述SN向所述MN发送所述MCG 失败消息或者没有收到所述MN对所述MCG失败消息的响应时，可以在所述候选小区中进行接入。
可选地，第八指示信息可以是RRC消息，但本申请对此不作限定。
基于该方案，终端设备可以根据MN的指示，在不能通过SN向MN发送MCG失败消息或者没有收到MN对MCG失败消息的响应时，进行相应操作，从而可以避免一些不合理的操作带来的通信中断延长等问题。
第八方面，提供了一种通信方法，包括：主节点MN生成第七指示信息；所述MN向终端设备发送所述第七指示信息；其中，所述第七指示信息用于指示终端设备在检测到无线连接失败时，可以优先通过辅节点SN向所述MN发送主小区组MCG失败消息。
MN通过第七指示信息指示终端设备在检测到无线连接失败时，可以优先通过辅节点SN向所述MN发送主小区组MCG失败消息，使得终端设备可以优先通过MCG快速恢复流程进行无线连接恢复，避免了RRC重建。
可选地，所述方法还包括：所述MN生成第八指示信息；所述MN向所述终端设备发送所述第八指示信息；其中，所述第八指示信息用于指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，可以在候选小区中进行接入。
MN通过第八指示信息指示终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，可以在候选小区中进行接入，使得终端设备可以优先常数在候选小区中进行接入，避免了RRC重建。
第九方面，提供了一种通信方法，包括：在终端设备检测到SCG失败时，若存在满足第八条件的候选小区，终端设备在目标小区中进行接入，目标小区为满足第八条件的候选小区，候选小区为MN预配置的小区。
根据本申请提供的方法，当SN失败时，终端设备可以先判断候选小区的信号质量，如果信号质量较好，则终端设备可以直接切换到候选小区，切换到候选小区之后，可以直接在候选小区进行数据通信(利用之前候选小区对应的无线配置信息)，而无需先暂停SCG中承载的传输，减少了业务中断的时间。
可选地，第八条件包括：小区的信号质量大于或等于一定门限。
小区信号质量较好时切换成功概率较大，因此终端设备可以在检测到SCG失败时，在信号质量较好的候选小区中进行接入。
可选地，结合第九方面，在第九方面的某些实现方式中，所述方法还包括：若不存在满足第八条件的小区，终端设备向MN发送SCG失败指示信息。
基于该方法，可以避免进行RRC重建。
可选地，结合第九方面，在第九方面的某些实现方式中，在所述终端设备在目标小区中进行接入之前，所述方法还包括：终端设备接收MN发送的第九指示信息，所述第九指示信息用于指示所述终端设备在终端设备检测到SCG失败时，若存在满足第八条件的候选小区，在目标小区中进行接入。
第十方面，提供了一种通信方法，包括：MN生成第九指示信息；MN向终端设备发送第九指示信息，第九指示信息用于指示终端设备在终端设备检测到SCG失败时，若存在满足第八条件的候选小区，在目标小区中进行接入。目标小区为满足第八条件的候选小 区，候选小区为MN预配置的小区。
根据本申请提供的方法，当SN失败时，终端设备可以先判断候选小区的信号质量，如果信号质量较好，则终端设备可以直接切换到候选小区，切换到候选小区之后，可以直接在候选小区进行数据通信(利用之前候选小区对应的无线配置信息)，而无需先暂停SCG中承载的传输，减少了业务中断的时间。
可选地，第九指示信息可以是RRC消息。
可选地，第八条件包括：小区的信号质量大于或等于一定门限。
第十一方面，提供了一种通信装置，包括用于执行第一方面、第三方面、第五方面、第七方面、第九方面以及第一方面、第三方面、第五方面、第七方面、第九方面中任一种可能实现方式中的方法的各个模块或单元。
第十二方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第一方面、第三方面、第五方面、第七方面、第九方面以及第一方面、第三方面、第五方面、第七方面、第九方面中任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为终端设备。当该通信装置为终端设备时，该通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于终端设备中的芯片。当该通信装置为配置于终端设备中的芯片时，该通信接口可以是输入/输出接口。
可选地，该收发器可以为收发电路。可选地，该输入/输出接口可以为输入/输出电路。
第十三方面，提供了一种通信装置，包括用于执行第二方面、第四方面、第六方面、第七八方面、第十方面以及第二方面、第四方面、第六方面、第八方面、第十方面中任一种可能实现方式中的方法的各个模块或单元。
第十四方面，提供了一种通信装置，包括处理器。该处理器与存储器耦合，可用于执行存储器中的指令，以实现上述第二方面、第四方面、第六方面、第七八方面、第十方面以及第二方面、第四方面、第六方面、第八方面、第十方面中任一种可能实现方式中的方法。可选地，该通信装置还包括存储器。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。
在一种实现方式中，该通信装置为网络设备。当该通信装置为网络设备时，所述通信接口可以是收发器，或，输入/输出接口。
在另一种实现方式中，该通信装置为配置于网络设备中的芯片。当该通信装置为配置于网络设备中的芯片时，所述通信接口可以是输入/输出接口。
可选地，所述收发器可以为收发电路。可选地，所述输入/输出接口可以为输入/输出电路。
第十五方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。所述处理电路用于通过所述输入电路接收信号，并通过所述输出电路发射信号，使得所述处理器执行第一方面至第十方面以及第一方面至第十方面中任一种可能实现方式中的方法。
在具体实现过程中，上述处理器可以为一个或多个芯片，输入电路可以为输入管脚，输出电路可以为输出管脚，处理电路可以为晶体管、门电路、触发器和各种逻辑电路等。 输入电路所接收的输入的信号可以是由例如但不限于接收器接收并输入的，输出电路所输出的信号可以是例如但不限于输出给发射器并由发射器发射的，且输入电路和输出电路可以是同一电路，该电路在不同的时刻分别用作输入电路和输出电路。本申请实施例对处理器及各种电路的具体实现方式不做限定。
第十六方面，提供了一种处理装置，包括处理器和存储器。该处理器用于读取存储器中存储的指令，并可通过接收器接收信号，通过发射器发射信号，以执行第一方面至第十方面以及第一方面至第十方面中任一种可能实现方式中的方法。
可选地，所述处理器为一个或多个，所述存储器为一个或多个。
可选地，所述存储器可以与所述处理器集成在一起，或者所述存储器与处理器分离设置。
在具体实现过程中，存储器可以为非瞬时性(non-transitory)存储器，例如只读存储器(read only memory，ROM)，其可以与处理器集成在同一块芯片上，也可以分别设置在不同的芯片上，本申请实施例对存储器的类型以及存储器与处理器的设置方式不做限定。
应理解，相关的数据交互过程例如发送指示信息可以为从处理器输出指示信息的过程，接收指示信息可以为处理器接收指示信息的过程。具体地，处理器输出的数据可以输出给发射器，处理器接收的输入数据可以来自接收器。其中，发射器和接收器可以统称为收发器。
上述第十六方面中的处理装置可以是一个或多个芯片。该处理装置中的处理器可以通过硬件来实现也可以通过软件来实现。当通过硬件实现时，该处理器可以是逻辑电路、集成电路等；当通过软件来实现时，该处理器可以是一个通用处理器，通过读取存储器中存储的软件代码来实现，该存储器可以集成在处理器中，可以位于该处理器之外，独立存在。
第十七方面，提供了一种计算机程序产品，所述计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当所述计算机程序被运行时，使得计算机执行上述第一方面至第十方面以及第一方面至第十方面中任一种可能实现方式中的方法。
第十八方面，提供了一种计算机可读介质，所述计算机可读介质存储有计算机程序(也可以称为代码，或指令)当其在计算机上运行时，使得计算机执行上述第一方面至第十方面以及第一方面至第十方面中任一种可能实现方式中的方法。
第十九方面，提供了一种通信系统，包括前述的网络设备和终端设备。
附图说明
图1是一种CU/DU分离架构的基站的示意图；
图2是应用于本申请的一种DC场景示意图；
图3是RRC重建过程的示意性流程图；
图4是本申请提供的一个通信方法的示意图；
图5是本申请提供的一个通信方法的示意性流程图；
图6是本申请提供的一个通信方法的示意图；
图7是本申请提供的一个通信方法的示意性流程图；
图8是本申请提供的一个通信方法的示意性流程图；
图9是本申请提供的通信装置的示意性框图；
图10是本申请提供的网络设备的结构示意图；
图11是本申请提供的终端设备的结构示意图。
具体实施方式
下面将结合附图，对本申请中的技术方案进行描述。
本申请实施例的技术方案可以应用于各种通信系统，例如：长期演进(long term evolution，LTE)系统、LTE频分双工(frequency division duplex，FDD)系统、LTE时分双工(time division duplex，TDD)、第五代(5th generation，5G)系统或新无线(new radio，NR)等。
本申请实施例中的终端设备可以指用户设备、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。终端设备还可以是蜂窝电话、无绳电话、会话启动协议(session initiation protocol，SIP)电话、无线本地环路(wireless local loop，WLL)站、个人数字助理(personal digital assistant，PDA)、具有无线通信功能的手持设备、计算设备或连接到无线调制解调器的其它处理设备、车载设备、可穿戴设备，未来5G网络中的终端设备或者未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的终端设备等，本申请实施例对此并不限定。
本申请实施例中的网络设备可以是任意一种具有无线收发功能的设备，包括但不限于：演进型节点B(evolved Node B，eNB)、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)，无线保真(wireless fidelity，WiFi)系统中的接入点(access point，AP)、无线中继节点、无线回传节点、传输点(transmission point，TP)或者发送接收点(transmission and reception point，TRP)等，还可以为5G，如，NR，系统中的gNB，或，传输点(TRP或TP)，5G系统中的基站的一个或一组(包括多个天线面板)天线面板，或者，还可以为构成gNB或传输点的网络节点，如基带单元(BBU)，或，分布式单元(distributed unit，DU)，或，集中式单元(centralized unit，CU)，或，CU-CP(control plan,控制面)，或，CU-UP(user plan，用户面)等。
在一些部署中，基站(如gNB)可能是集中式单元(centralized unit，CU)/DU分离架构的基站。例如，图1示出一种CU/DU分离架构的基站。
CU和DU可以理解为是对基站从逻辑功能角度的划分。CU和DU在物理上可以是分离的也可以部署在一起。多个DU可以共用一个CU。一个DU也可以连接多个CU。CU和DU之间可以通过接口相连，例如可以是F1接口。CU和DU可以根据无线网络的协议层划分。例如，无线资源控制(radio resource control，RRC)、业务数据适配协议栈(service data adaptation protocol，SDAP)以及分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能可以设置在CU，而无线链路控制(radio link control，RLC)、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层等的功能可以设置在DU。CU的功能可以由一个实体来实现也可以由不同的实体实现。例如，可以对CU的功能进 行进一步切分，例如，将控制面(CP)和用户面(UP)分离，即CU的控制面(CU-CP)和CU用户面(CU-UP)。例如，CU-CP和CU-UP可以由不同的功能实体来实现，所述CU-CP和CU-UP可以与DU相耦合，共同完成基站的功能。一种可能的方式中，CU-CP负责控制面功能，主要包含RRC和处理RRC消息的PDCP(PDCP-C)。PDCP-C主要负责RRC消息的加解密，完整性保护，数据传输等。CU-UP负责用户面功能，主要包含SDAP和处理用户数据的PDCP。其中SDAP主要负责将核心网的数据进行处理并将数据流(flow)映射到承载。PDCP-U主要负责用户数据的加解密，完整性保护，头压缩，序列号维护，数据传输等。其中CU-CP和CU-UP通过E1接口连接。CU-CP代表基站通过Ng接口和核心网连接。通过FI控制面(F1-C)和DU连接。CU-UP通过F1用户面(F1-U)和DU连接。
在本申请实施例中，终端设备或网络设备包括硬件层、运行在硬件层之上的操作系统层，以及运行在操作系统层上的应用层。该硬件层包括中央处理器(central processing unit，CPU)、内存管理单元(memory management unit，MMU)和内存(也称为主存)等硬件。该操作系统可以是任意一种或多种通过进程(process)实现业务处理的计算机操作系统，例如，Linux操作系统、Unix操作系统、Android操作系统、iOS操作系统或windows操作系统等。该应用层包含浏览器、通讯录、文字处理软件、即时通信软件等应用。并且，本申请实施例并未对本申请实施例提供的方法的执行主体的具体结构特别限定，只要能够通过运行记录有本申请实施例的提供的方法的代码的程序，以根据本申请实施例提供的方法进行通信即可，例如，本申请实施例提供的方法的执行主体可以是终端设备或网络设备，或者，是终端设备或网络设备中能够调用程序并执行程序的功能模块。
另外，本申请的各个方面或特征可以实现成方法、装置或使用标准编程和/或工程技术的制品。本申请中使用的术语“制品”涵盖可从任何计算机可读器件、载体或介质访问的计算机程序。例如，计算机可读介质可以包括，但不限于:磁存储器件(例如，硬盘、软盘或磁带等)，光盘(例如，压缩盘(compact disc，CD)、数字通用盘(digital versatile disc，DVD)等)，智能卡和闪存器件(例如，可擦写可编程只读存储器(erasable programmable read-only memory，EPROM)、卡、棒或钥匙驱动器等)。另外，本文描述的各种存储介质可代表用于存储信息的一个或多个设备和/或其它机器可读介质。术语“机器可读介质”可包括但不限于，无线信道和能够存储、包含和/或承载指令和/或数据的各种其它介质。
本申请提供的方法应用于双连接(dual connectivity，DC)场景。为便于理解，先以终端设备为UE，网络设备为基站为例，并结合图2，对DC场景进行介绍。
在无线网络中，一个UE可能和多个基站通信，即双连接(dual connectivity，DC)，也称为多无线双连接(Multi-Radio dual connectivity，MR-DC)。这多个基站可能是属于同一制式的基站(比如都是4G基站，或者都是5G基站)，也可能是不同机制的基站(比如一个是第四代4G基站，一个是第五代5G基站)。
例如，图2示出了一种应用于本申请的DC场景示意图。参见图2，UE 140可以通过DC技术与基站110和基站120通信，基站110和基站120共同接入核心网130。核心网130可能是4G核心网，也可能是5G核心网。
DC中，与核心网有控制面信令交互的基站称为主节点(master node，MN)，其他基站称为辅节点(secondary node，SN)。MN有时也称为主基站，SN有时也称为辅基站。
本申请适用的场景包括但不限于下述DC类型：演进的通用陆基无线接入和新无线双连接(E-UTRA-NR dual connectivity,EN-DC)、下一代无线接入网演进的通用陆基无线接入和新无线双连接(NG-RAN E-UTRA-NR dual connectivity,NGEN-DC)、新无线和演进的通用陆基无线接入双连接(NR-E-UTRA dual connectivity，NE-DC)、新无线和新无线双连接(NR-NR cual connectivity，NR-DC)。
EN-DC中，主基站为连接到4G核心网的LTE基站(例如eNB)，辅基站为NR基站(例如gNB)。
NGEN-DC中，主基站为连接5G核心网的LTE基站，辅基站为NR基站。
NE-DC中，主基站为连接到5G核心网的NR基站，辅基站为LTE基站。
NR-DC中，主基站为连接到5G核心网的NR基站，辅基站为NR基站。
DC中，辅基站下的服务小区称为辅小区组(secondary cell group，SCG)，该辅小区组由主辅小区(primary SCG cell，PSCell)和可选的一个或多个辅小区组成。主基站下的小区称为主小区组(master cell group，MCG)，该主小区组由主小区(primary cell，PCell)和可选的一个或多个辅小区组成。
PCell是指，部署在主频点的MCG小区，且UE在该小区中执行初始连接建立过程或者执行连接重建过程，或者在切换过程中指定该小区为PCell。PScell是指，SCG小区中UE执行同步的重配过程时进行随机接入的小区，或者当执行SCG改变的时候且无需随机接入过程时UE发起初始物理上行共享信道(physical uplink share channel，PUSCH)传输的小区。具体描述可以参见3GPP TS 36.331和38.331协议。
应理解，本申请的应用场景不限于上述DC场景，本申请还适用于其他系统的DC场景，如5G基站和WIFI组成的DC场景，或者部署为授权频谱的基站和部署为非授权频谱的基站组成的DC场景。
下面对本申请所涉及的一些技术进行简要介绍。
1、CHO机制
在传统的切换流程中，连接态终端设备的移动性管理是由网络设备控制的，即网络设备通过发送切换消息指示终端设备切换到哪个小区以及如何进行切换。具体的，源网络设备向终端设备发送切换消息以控制终端设备从源小区切换到目标小区，终端设备在接收到该切换消息后，根据切换消息中包含的内容，接入目标小区。因此，切换消息的成功发送是保证传统切换机制下成功切换的必要条件。然而，在LTE系统或NR系统中，信号质量的快速衰减、或者终端设备的快速移动以及物体的遮挡、切换准备的持续时间较长等都会导致切换消息发送失败，进而导致切换失败，降低切换成功率。另外，传统的切换流程中，网络设备一般是通过终端设备上报的信号质量来判断是否指示终端设备进行切换，比如终端设备检测到邻区的信号质量比当前服务小区的信号质量好于一定阈值时，则终端设备上报测量结果，然而，在LTE系统或NR系统中，信号质量的快速衰减、或者终端设备的快速移动以及物体的遮挡、切换准备的持续时间较长等都会导致测量报告发送失败，进而导致切换失败，降低切换成功率。
鉴于上述问题，提出了CHO机制，以提升切换成功率。
CHO机制中，源小区在源链路质量较好时向终端设备发送CHO配置信息，CHO配置信息中可以包括CHO触发条件和一个或多个候选小区的信息，其中候选小区的信息可 以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备在接收到该CHO配置信息后，根据该CHO配置信息判断候选小区是否满足CHO触发条件，将满足CHO触发条件的某候选小区作为目标小区。然后，终端设备与确定出的目标小区进行随机接入过程，当随机接入成功完成，终端设备给目标小区发送RRC消息(如RRC重配置完成消息)，通知目标小区条件切换完成。
2、MCG快速恢复
在MCG发生RLF时，终端设备检测SCG是否失败，如果没有检测到SCG失败，则终端设备可以发起MCG快速恢复流程。MCG快速恢复流程大致包括：终端设备通过SN向MN发送MCG失败消息，MN根据该MCG失败消息进行一定操作，比如发起RRC重配或者小区切换来恢复MCG。如果检测到SCG失败，则终端设备发起RRC重建过程。
3、RRC重配
RRC重配，即RRC连接重配置，其目的是修改RRC连接，例如建立、修改或释放无线承载(radio bearer，RB)，执行切换，建立、修改或释放测量中的一项或多项。终端设备接收到网络设备(如，MN)发送的RRC(或，RRC连接)重配消息后，根据该RRC重配消息中的内容进行相应操作，如进行切换。如果终端设备成功执行该相应操作，则向网络设备发送RRC重配完成消息，以完成RRC重配。
4、RRC重建
当发生无线连接失败时，如RLF、重配置失败等，终端设备可在RRC连接状态下发起RRC重建过程以恢复RRC连接。
图3示出了终端设备连接到5G核心网时，RRC重建的大致过程。如3所示的RRC重建过程主要涉及终端设备和网络设备之间的交互，网络设备和核心网设备之间的交互这里未示出。
S301，终端设备向目标网络设备发送RRC重建请求消息。
应理解，源网络设备表示源小区所对应的网络设备，目标网络设备为目标小区所对应的网络设备。
现有技术的RRC重建过程中，在终端设备发送RRC重建请求消息之前，终端设备会执行如下行为：暂停所有的RB，除了信令无线承载0(signalling radio bearer 0，SRB0)；重置MAC层；释放MCG中的辅小区；释放SCG的配置；执行小区选择过程。
当终端设备小区选择到一个同制式的小区时，终端设备才会发送RRC重建请求消息。
当终端设备小区选择到不同制式的小区时，终端设备进入RRC空闲态(RRC_IDLE)。
终端设备在发送RRC重建请求消息之前，还可以执行如下行为：
重建信令无线承载1(signaling radio bearer 1，SRB1)对应的PDCP，重建SRB1对应的RLC，重新恢复SRB1。
S302，目标网络设备根据该RRC重建请求消息向源网络设备发送上下文请求消息。
S303，源网络设备接收到目标网络设备发送的上下文请求消息后，向目标网络设备发送该终端设备的上下文。
S304，目标网络设备接收到终端设备的上下文之后，向终端设备发送RRC重建消息。
该RRC重建消息目的是用于重建SRB1以及更新加密的秘钥。终端设备收到RRC重 建消息之后，认为当前小区为主小区PCell，并存储其中携带的加密的秘钥，恢复SRB的加密和完整性保护。
S305，终端设备向目标网络设备回复RRC重建完成消息，该消息用于确定RRC重建的成功完成。
S306，目标网络设备向终端设备发送RRC重配消息。
目标网络设备可能携带一些信息以通知终端设备执行对SRB2和数据无线承载(data radio bearers，DRB)的重配。
需要说明的是，步骤S305和S306之间没有严格的先后关系。
S307，终端设备向目标网络设备回复RRC重配完成消息。
之后，目标网络设备可以向源网络设备请求数据转移，源网络设备把还没有成功发送给终端设备的下行数据包和/或源网络设备已经正确接收的但是乱序接收的上行数据包转移给目标基站。对于转移的下行数据包，目标基站可以发送给终端设备，对于转移过来的乱序的上行数据包，目标网络设备等从终端设备正确接收到了其他数据包之后，使得这些数据包可以按序提交给上层时，(比如目标网络设备的PDCP层可以按序把这些上行数据包提交给上层)，再把这些包提交给上层。
上文仅对图3所示的各消息进行了简要介绍，关于这些消息所代表的具体含义及其所包含的内容，具体可以参见现有协议。
应理解，若源小区和目标小区对应同一个网络设备，则可以不执行S302和S303。
现有技术的RRC重建过程中，终端设备所选择的目标小区和源小区可能不是同一制式的，例如一个是4G小区一个是5G小区，此时将会导致终端设备进入RRC空闲态，从而导致终端设备的通信中断。另外，即使目标小区和源小区是同一个制式的，若目标网络设备和源网络设备之间没有直接的Xn/X2接口，那么源网络设备不能给目标网络设备发送终端设备的上下文，源网络设备也无法把数据包转移给目标网络设备，从而导致丢包问题。因此，应该尽量避免通过发起现有技术的RRC重建过程来进行无线连接恢复。
为此，本申请提供了两种机制来降低终端设备发起现有技术的RRC重建过程概率，以此降低终端设备通信中断的概率，提高用户体验。
机制一：
当终端设备检测到无线连接失败时，终端设备优先进行小区选择。如果所选择的小区属于MN预配置的候选小区，则终端设备在所选择的小区中进行接入；如果所选择的小区不属于所述候选小区，则终端设备在没有检测到SCG失败时，通过SN向MN发送主小区组MCG失败消息。
如前所述，传统的切换流程中，测量报告或者切换命令的发送都可能导致切换失败。而在该机制中，终端设备在所选择的小区属于候选小区时，在该所选择的小区中进行接入。由于候选小区的信息已经由MN提前配置，因此不需要发送测量报告也不需要等待切换命令才切换，从而能够提高接入到选择的小区的成功率。另一方面，在终端设备所选择的小区不是候选小区时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。相比于现有技术中的RRC重建过程可能导致的通信中断或者丢包问题，RRC重配过程和小区切换过程不会导致终端设备的通信中断以及丢包问题，因此本申请提供的方法通过避免RRC 重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
机制二：
当终端设备检测到无线连接失败时，若没有检测到SCG失败，则通过SN向MN发送MCG失败消息。若检测到SCG失败，则进行小区选择，并且在所选择的小区属于MN预配置的候选小区时，在所选择的小区中进行接入。
基于该机制，当终端设备检测到无线连接失败时，一方面，在没有检测到SCG失败时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。另一方面，在检测到SCG失败时，终端设备在选择到候选小区时，可以在候选小区中进行接入，进一步避免了现有技术中的RRC重建流程。基于上述方法，通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
本申请中，终端设备具体是采用机制一还是采用机制二来进行无线连接恢复，可以由协议规定也可以由MN指示。
例如，第一种方式，协议规定终端设备采用机制一来进行无线连接恢复。当然，协议也可以规定终端设备不采用机制一而采用机制二来进行无线连接恢复。
第二种方式，由MN指示终端设备采用机制一来进行无线连接恢复。当然，也可以由MN指示终端设备不采用机制一而采用机制二来进行无线连接恢复。
比如，MN可以向终端设备发送第一指示信息，第一指示信息可以指示终端设备采用机制一进行无线连接恢复，或者说，第一指示信息可以指示终端设备在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于候选小区时在所选择的小区中进行接入。
再如，MN可以向终端设备发送第三指示信息，第三指示信息可以指示终端设备采用机制二进行无线连接恢复，或者说，第三指示信息可以指示终端设备在检测到无线连接失败时，优先通过SN向MN发送MCG失败消息。
第三种方式，协议规定一定的条件，并且由协议规定，该条件成立时，终端设备采用机制一和采用机制二中的哪一个进行无线连接恢复，该条件不成立时，终端设备采用机制一和采用机制二中的哪一个进行无线连接恢复。
第四种方式，由MN指示一定的条件，并由协议规定，该条件成立时，终端设备采用机制一和采用机制二中的哪一个进行无线连接恢复，该条件不成立时，终端设备采用机制一和采用机制二中的哪一个进行无线连接恢复。
第五种方式，由MN指示一定的条件，并由MN指示，该条件成立时，终端设备采用机制一和采用机制二中的哪一个进行无线连接恢复，该条件不成立时，终端设备采用机制一和采用机制二中的哪一个进行无线连接恢复。
上述方式三、方式四和方式五中的条件都可以记作：判断条件#1。
本申请中，若判断条件#1成立，则终端设备采用机制一和机制二中的其中一者；若判断条件#1不成立，终端设备采用机制一和机制二中的另一者。比如，若判断条件#1成立，则终端设备采用机制一，若判断条件#1不成立，则终端设备采用机制二。下面进行举例说明。
示例1
判断条件#1可以是第一条件。若满足第一条件，或者称，第一条件成立，则终端设备采用机制一，否则，终端设备采用机制二。
结合第四种方式举例来说，MN可以向终端设备发送第一指示信息，第一指示信息可以包括第一条件，第一条件指示终端设备在满足第一条件时采用第一机制，或者说，第一条件指示终端设备在检测到无线连接失败且满足第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入。
结合第五种方式举例来说，MN可以向终端设备发送第一指示信息，第一指示信息可以包括第一条件，并且第一指示信息还指示终端设备在满足第一条件时采用第一机制，或者说，第一指示信息指示终端设备在检测到无线连接失败且满足第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入。
比如，第一条件可以是MN预配置的候选小区中存在信号质量大于第一阈值的小区。那么，若候选小区中存在信号质量大于第一阈值的小区，则终端设备采用机制一；若候选小区中不存在信号质量大于第一阈值的小区，则终端设备采用机制二。
又如，第一条件可以是SN的信号质量小于或等于第二阈值。那么，若SN的信号质量≤第二阈值，则终端设备采用机制一；若SN的信号质量>第二阈值，则终端设备采用机制二。
示例性的，本申请中的SN的信号质量可以指PSCell的信号质量。另外本申请中的信号质量可以是参考信号接收功率(reference signal received power，RSRP)、参考信号接收质量(reference signal received quality，RSRQ)和信号干扰噪声比(signal to interference plus noise ratio，SINR)中的一项或多项。
示例2
判断条件#1可以是第三条件。若满足第三条件，或者称，第三条件成立，则终端设备采用机制二，否则，终端设备采用机制一。
结合第四种方式举例来说，MN可以向终端设备发送第三指示信息，第三指示信息可以包括第三条件，第三条件指示终端设备在满足第三条件时采用第二机制，或者说，第三条件指示终端设备在检测到无线连接失败且满足第三条件时，可以优先通过SN向MN发送MCG失败消息。
结合第五种方式举例来说，MN可以向终端设备发送第三指示信息，第三指示信息可以包括第三条件，并且第三指示信息还指示终端设备在满足第三条件时采用第二机制，或者说，第三指示信息指示终端设备在检测到无线连接失败且满足第三条件时，可以优先通过SN向MN发送MCG失败消息。
比如，第三条件可以是SN的信号质量大于第二阈值。那么，若SN的信号质量>第二阈值，则终端设备采用机制二；若SN的信号质量≤第二阈值，则终端设备采用机制一。
下面，分别结合图4和图5所示的通信方法，对上述机制一和机制二进行详细说明。
应理解，下文所描述的方法在应用于图2所述的系统时，终端设备可以对应UE 140，MN可以对应基站110和基站120中的一者，SN可以对应基站110和基站120中的另一者。
图4示出了一种通信方法400。该方法400对应机制一。下面对图4所示的方法的各步骤进行说明。
S410，MN向终端设备发送配置信息。
该配置信息可以包括一个或多个候选小区的信息。候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。
示例性的，该配置信息可以是CHO配置信息。CHO配置信息的具体形式可以参见前文在CHO机制中的描述或者可以参见现有技术。
S420，终端设备在检测到无线连接失败时，进行小区选择。
本申请中，无线连接失败可以包括下述情况中的一项或多项：
(1)MCG发生了RLF。
MCG发生了RLF包括如下一种或多种：(a)检测到物理层的问题。比如当终端设备的RRC层从底层收到连续的N个主小区PCell的失步指示，且在之后的一段时间内没有从底层收到连续的M个主小区PCell的同步指示。(b)在MCG进行的随机接入过程失败。(c)MCG RLC层中最大重传次数达到了。
(2)终端设备没有成功完成MCG配置的需要终端设备进行同步的RRC重配(比如当终端设备接收到具有携带了需要执行同步的重配消息(比如RRC重配消息中携带了reconfigurationWithSync信元)时，终端设备启动定时T304。如果终端设备在RRC重配消息中下发的目标小区中成功执行随机接入过程，则终端设备取消T304。如果T304定时器超时，则认为终端设备没有成功完成需要同步的RRC重配)。
(3)RRC重配失败，比如，终端设备无法遵从收到的RRC重配消息中的部分配置。
(4)终端设备对接收到的数据包进行完整性校验失败。即终端设备的PDCP层对SRB1或者SRB2中收到的数据包进行完整性校验失败。
(5)从当前无线通信制式切换到其他通信制式时失败。
示例性的，当上述中的某一项或多项发生时，或者其他问题导致的无线连接失败时，终端设备可以采用S准侧进行小区选择。
S准则公式：S rxlev>0，即小区的S值如果大于0，则说明该小区是合适的小区，S rxlev的计算公式是：
S rxlev＝Q rxlevmeas-(Q rxlevmin-Q rxlevminoffset)-P compensation
其中：
S rxlev：计算得到的小区选择接收电平值；
Q rxlevmeas：终端设备测量得到的接收信号强度值，该值为测量到的参考信号接收功率(reference signal receiving power，RSRP)；
Q rxlevmin：该小区要求的最小接收信号强度值；
P compensation：(PEMAX–PUMAX)或0中的较大值，其中PEMAX为终端设备在接入该小区时，系统设定的最大允许发送功率；PUMAX是指根据终端设备等级规定的最大输出功率。
Q rxlevminoffset：该参数只有在终端设备正常驻留在一个虚拟专用移动网(virtual private mobile network，VPMN)，周期性搜索一个高优先级的公共陆地移动网络(public land mobile network，PLMN)进行小区选择评估时才有效，该参数对Q rxlevmin进行一定的偏置。
需要说明的是，由于通信协议版本的演进，S准则公式和S rxlev的计算公式可能会由 于某些原因发生改变，这里给出的公式只是例子，并不对公式本身做任何限定。
需要说明的是，终端设备执行的小区选择可能不是在RRC重建过程中执行的小区选择(比如终端设备在检查到无线连接失败后，直接执行小区选择)，也可能是在RRC重建中执行的小区选择，比如，协议中是把本步骤中的小区选择放在RRC重建中，但该RRC重建并不和现有技术中的RRC重建相同，比如至少不会执行如下行为：暂停所有的RB(除了SRB0)，释放SCG配置中的至少一项。
在S420中，若终端设备所选择的小区为候选小区，则执行S430，否则执行S440。
可选地，若终端设备所选择的小区为候选小区，且满足第五条件，则执行S430。可选地，若终端设备选择到了候选小区，但是第五条件不满足，仍然执行S440。
示例性的，可以由MN指示终端设备在所选择的小区为候选小区，且满足第五条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入。比如，第五条件可以是存在信号质量大于一定阈值的候选小区，或者，SN的信号质量小于或等于一定阈值。
应理解，第五条件可以由MN配置，也可以由协议规定，本申请对此不作限定。
S430，终端设备在所选择的小区中进行接入。
下文中，将终端设备在S420中所选择的小区称为：目标小区#1。也就是说，若目标小区#1为MN通过配置信息配置的一个或多个候选小区中的其中一个，则终端设备在目标小区#1中进行接入。
应理解，若目标小区#1对应(或者说，属于)所述MN，即，目标小区#1属于所述MN的MCG，则在S430中，终端设备接入所述MN。若目标小区#1与源小区(即，与终端设备发生无线连接失败的小区)对应不同的网络设备(如，基站)，此时所述MN可以为源网络设备，或源MN，目标小区#1对应的网络设备为目标网络设备，为便于区分，记作：目标网络设备#1。图4中示出了目标小区#1和源小区对应不同的网络设备的情况。
还应理解，若目标小区#1和源小区对应不同的网络设备，终端设备接入目标小区#1后，目标网络设备#1还可以指示源MN释放该终端设备的上下文。此外，终端设备接入目标小区#1后，还涉及一些目标网络设备#1和核心网设备之间的交互，这些交互内容与可以参考现有技术中小区切换过程中目标网络设备和核心网设备之间的交互内容相同，具体可以参考现有技术中小区切换过程，这里不再赘述。
示例性的，终端设备在目标小区#1中进行接入具体可以是终端设备发起随机接入过程，并发送RRC重配完成消息给目标小区#1，但本申请对此不作限定。比如，终端设备在目标小区#1中进行接入具体还可以是终端设备在目标小区#1无需随机接入过程，直接根据目标小区#1发送的上行授权信息发送RRC重配完成消息。
可选地，若终端设备在目标小区#1中的接入失败，终端设备可以执行S440以及后续相应步骤。
比如，MN可以向终端设备发送一个指示信息(比如在S430之前。例如在S40中)，指示终端设备在目标小区#1中接入失败时，比如未收到RRC重配完成消息时，且没有检测到SCG失败时，通过发送MCG失败消息发起MCG快速恢复流程。
S440，终端设备判断是否检测到SCG失败。
示例性的，SCG失败可以是如下一种或多种：
1)检测到物理层的问题。比如当终端设备的RRC层从底层收到连续的N个主辅小区PSCell的失步指示，且在之后的一段时间内没有从底层收到连续的M个主辅小区PSCell的同步指示；
2)在SCG进行的随机接入过程失败；
3)SCG RLC层中最大重传次数达到了；
4)SN改变失败；
5)SRB3配置失败；
6)SRB3的完整性校验失败。即终端设备的PDCP层对SRB3中收到的数据包进行完整性校验失败。
在S440中，若没有检测到SCG失败，则执行S450。可选地，若检测到SCG失败，则执行S460。
在一个示例中，可以由MN指示终端设备在目标小区#1不为候选小区且没有检测到SCG失败时，是否执行S450。
比如，在S440之前，源MN可以向终端设备发送第二指示信息，第二指示信息可以是下述形式中的任一种：
(1)第二指示信息指示终端设备在所选择到的小区不属于候选小区时，可以通过SN向MN发送MCG失败消息。这样，终端设备在目标小区#1不属于候选小区且没有检测到SCG失败时，可以执行S450。
(2)第二指示信息包括第二条件，第二条件用于指示终端设备在所选择到的小区不属于候选小区，且满足第二条件时，可以通过SN向MN发送MCG失败消息。
具体地，由MN指示第二条件，并由协议规定，终端设备在所选择到的小区不属于候选小区，且该第二条件满足时，终端设备可以在没有检测到SCG失败时，通过SN向MN发送MCG失败消息。
示例性的，第二条件可以是SN的信号质量大于第四阈值，也可以是目标小区的信号的质量小于第三阈值。
(3)第二指示信息包括第二条件，第二指示信息指示终端设备在所选择到的小区不属于候选小区，且满足第二条件时，可以通过SN向MN发送MCG失败消息。
即，由MN指示第二条件，并由MN指示，终端设备在所选择到的小区不属于候选小区，且该第二条件满足时，终端设备在没有检测到SCG失败时，通过SN向MN发送MCG失败消息。
第二条件如前所述，这里不再赘述。
可选地，S410中的配置信息、前文描述的第一指示信息和这里的第二指示信息可以通过同一条信令携带，也可以通过不同的信令携带，本申请对此不作限定。
S450，终端设备发起MCG快速恢复流程。
终端设备通过发起MCG快速恢复流程，尝试恢复无线连接。MCG快速恢复流程可以包括：S450a至S450e。S450a，终端设备向SN发送MCG失败消息。
可选地，MCG失败消息可以通过SN的RRC消息携带，比如SRB3。MCG失败消息也可以通过MCG的SRB在SN侧的一条支路发送，比如split SRB1在SCG中的支路。
S450b，SN将该MCG失败消息发送给MN。
S450c，MN进行相关处理。
例如，MN可以对终端设备进行RRC重配，或指示终端设备进行小区切换。可选地，MN还可以释放该终端设备。
S450d，MN向SN发送RRC重配消息或RRC释放消息。
MN可以指示SN通过split SRB1或SRB3把这些消息发送给终端设备。
若MN指示终端设备进行小区切换，可选地，该RRC重配消息可以包括切换信息，指示终端设备在目标小区#2中进行接入。需注意的是，目标小区#2为MN所确定的小区，与目标小区#1可能不同。比如，终端设备可以在发送的MCG失败消息中携带小区测量报告，MN可以基于该测量报告确定目标小区#2。
若目标小区#2和源小区对应不同的网络设备，则S450中涉及的MN为源MN，目标小区#2对应的网络设备为目标网络设备，记作：目标网络设备#2。目标网络设备#2和目标网络设备#1可能相同，也可能不同。并且，在此场景下，在源MN给SN发送RRC重配消息或RRC释放消息之前，源MN会给目标网络设备#2发送切换请求消息，目标网络设备#2给源MN反馈一个切换请求响应消息，其中携带目标网络设备#2给终端设备的RRC重配消息。源MN把该目标网络设备#2给终端设备的RRC重配消息发送给SN。
若MN决定给终端设备发送RRC释放消息，则MN把RRC释放消息发送给SN。
可选的，MN给SN发送RRC重配消息或RRC释放消息是在MN给SN发送SN释放消息之前发送的。可选的，MN需要在SN向MN反馈了MN给SN发送的RRC重配消息或RRC释放消息已经成功发送给终端设备之后，MN才给SN发送SN释放消息。
S450e，SN向终端设备发送RRC重配消息或RRC释放消息。
可选的，SN可以通过split SRB1或SRB3发送这些消息。
需要说明的是，这里是指SN把MN给SN的RRC重配消息或RRC释放消息发送给UE。
可选地，若SN向终端设备发送的是RRC重配消息，则S450e之后还可以包括：终端设备收到SN发送的RRC重配消息之后，向目标网络设备#2发送RRC重配完成消息。
S460，终端设备进行RRC重建。
RRC重建过程可以参见图3，其中，图3中的源网络设备对应这里的源MN，目标网络设备对应这里的目标网络设备#1。
本申请提供的通信方法，终端设备在所选择的小区属于候选小区时，在该所选择的小区中进行接入。由于候选小区的信息已经由MN提前配置，因此不需要发送测量报告也不需要等待切换命令才切换，从而能够提高接入到选择的小区的成功率。另一方面，在终端设备所选择的小区不是候选小区时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。相比于现有技术中的RRC重建过程可能导致的通信中断或者丢包问题，RRC重配过程和小区切换过程不会导致终端设备的通信中断以及丢包问题，因此本申请提供的方法通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
对于上文已经作过解释说明的内容，如对无线连接失败的解释，下文中将不再重复说明。
图5示出了另一种通信方法500。该方法500对应机制二。下面对图5所示的方法的 各步骤进行说明。
S510，MN向终端设备发送配置信息。该步骤与S410相同，可参见S410。
S520，终端设备检测到无线连接失败时，判断是否检测到SCG失败。在S520中，若没有检测到SCG失败，则执行S530。若检测到SCG失败，则执行S540。
示例性的，可以由MN指示终端设备在检测到SCG失败时，是否执行S540。
比如，在S540之前，MN可以向终端设备发送第四指示信息，第四指示信息可以是下述形式中的任一种：
(1)第四指示信息用于指示终端设备在不能通过SN向MN发送MCG失败消息时，可以在候选小区中进行接入。
所述“不能通过SN向MN发送MCG失败消息”是指终端设备检测到SCG失败。所述“可以在候选小区中进行接入”是指，终端设备可以进行小区选择，若所选择的小区为候选小区，则在该候选小区中进行接入。
(2)第四指示信息包括第四条件，第四条件指示终端设备在不能通过SN向MN发送MCG失败消息，且满足第四条件时，可以在候选小区中进行接入。
具体地，由MN指示第四条件，并由协议规定，终端设备在不能通过SN向MN发送MCG失败消息，且满足第四条件时，可以在候选小区中进行接入。
示例性的，第四条件可以是存在信号质量大于第五阈值的候选小区。
(3)第四指示信息包括第四条件，第四指示信息指示终端设备在不能通过SN向主节点发送MN失败消息，且满足第四条件成立时，可以在候选小区中进行接入。
即，由MN指示第四条件，并由MN指示，终端设备在在不能通过SN向主节点发送MN失败消息，且满足第四条件成立时，可以在候选小区中进行接入。
可选地，S510中的配置信息、前文描述的第三指示信息以及这里的第四指示信息可以通过同一条信令携带，也可以通过不同的信令携带，本申请对此不作限定。
S530，终端设备发起MCG快速恢复流程。
具体地，终端设备通过SN向MN发送SCG失败消息，发起MCG快速恢复流程。
MCG快速恢复流程的具体过程可以参见上文对S450所作的说明，这里不再赘述。
可选地，若终端设备没有接收到MN对SCG失败消息的响应，则终端设备可以执行S540以及后续相应操作。比如，终端设备在发起MCG快速恢复流程时，可以启动一个定时器。如果在定时器超时时，终端设备还没有收到RRC重配消息或RRC释放消息，则终端设备可以执行S540以及后续相应操作。
示例性的，MN可以指示终端设备在没有接收到MN对SCG失败消息的响应时，执行S540以及后续相应操作。比如，MN也可以通过上述第四指示信息指示，或者MN可以通过另一条消息进行指示。
S540，终端设备进行小区选择。
例如，终端设备可以采用S准则进行小区选择，具体可以参见S420中对S准则所作的说明。
需要说明的是，终端设备执行的小区选择过程可能不是在RRC重建过程中执行的小区选择，也可能是在RRC重建中执行的小区选择。具体描述同S420中的描述。
在S540中，若终端设备所选择的小区为候选小区，则执行S550。可选地，若终端设 备所选择的小区不是候选小区，则执行S560。
S550，终端设备在所选择的小区中进行接入。
该步骤与S430相同，具体可以参见S430。
S560，终端设备进行RRC重建。
该步骤与S460相同，具体可以参见S460。
根据本申请提供的方法，当终端设备检测到无线连接失败时，一方面，在没有检测到SCG失败时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。另一方面，在检测到SCG失败时，终端设备在选择到候选小区时，可以在候选小区中进行接入，进一步避免了现有技术中的RRC重建流程。基于上述方法，通过避免现有技术中的RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
本申请还提供了另外两种方法来避免现有技术中的RRC重建。下面结合图6和图7进行说明。
图6示出了一种通信方法600。下面对图6所示的方法600的各步骤进行说明。
S610，终端设备接收MN发送的配置信息。该步骤与S410相同，可参见S410。
S620，终端设备在检测到无线连接失败时，终端设备判断是否存在满足第六条件的候选小区。若存在，则执行S630；否则，即没有一个候选小区的信号质量满足第六条件，执行S640。
示例性的，第六条件可以是小区的信号质量大于一定门限。
S630，终端设备在目标小区中进行接入。应理解，这里的目标小区是满足第六条件的候选小区。
终端设备在目标小区中进行接入与S430中的终端设备在目标小区#1中进行接入类似，这里不再赘述。
S640～S660，同S440～S460，这里不再赘述。
基于该方法，终端设备在检测到无线连接失败时，若存在满足一定条件的候选小区，则在该候选小区中进行接入，若不存在满足该条件的候选小区，则通过发送MCG失败消息触发MCG快速恢复流程。基于该方法，可以避免现有技术中的RRC重建，从而能够避免终端设备的通信终端和丢包问题。
可选地，在S630之前，MN可以向终端设备发送第五指示信息，指示终端设备在检测到无线连接失败时，若确定存在满足第六条件的候选小区，则执行S630。
可选地，在终端设备发送SCG失败消息之前，该方法还可以包括：MN向终端设备发送第六指示信息，第六指示信息用于指示终端设备在不存在满足第六条件的候选小区时，可以通过SN向MN发送MCG失败消息。
图7示出了一种通信方法700。下面对图7所示的方法700的各步骤进行说明。
S710～S730，同S510～S530。
S740，终端设备判断是否有满足第七条件的候选小区。
若满足，则执行S750，否则执行S760。
示例性的，第七条件可以是小区的信号质量大于一定门限。
终端设备可以判断之前配置的候选小区的信号质量，如果有一个候选小区的信号质量 大于该门限，则执行S750，否则(即没有一个候选小区的信号质量满足大于该门限)，执行S760。
S750，终端设备在目标小区中进行接入。这里的目标小区是满足第七条件的候选小区。
该步骤与S550类似，可以参照S550。
S760，终端设备进行RRC重建。该步骤与S560相同。
基于该方法，终端设备检测到无线连接失败时，一方面，在没有检测到SCG失败时，终端设备通过SN向MN发送MCG失败消息，可以触发MN通过RRC重配或者小区切换流程来恢复无线连接，从而避免了现有技术中的RRC重建。另一方面，在检测到SCG失败时，若存在满足一定条件的候选小区，可以在满足条件的候选小区中进行接入，进一步避免了现有技术中的RRC重建流程。基于上述方法，通过避免RRC重建过程，能够避免通信中断和丢包问题，从而可以提高用户体验。
本申请还提供了一种通信方法，该方法包括：MN向终端设备发送指示信息#1，该指示信息#1用于指示终端设备在检测到无线连接失败时进行小区选择，并在所选择的小区属于候选小区时在所选择的小区中进行接入。
以下为了便于说明，将终端设备进行小区选择，并在所选择的小区属于候选小区时在所选择的小区中进行接入这个过程称为：第一流程。
可选地，指示信息#1可以直接指示终端设备在检测到无线连接失败时执行第一流程。
示例性的，指示信息#1为通过CHO配置信息发送的，或者，指示信息#1为CHO配置信息。
进一步地，指示信息#1是终端设备最近一次接收到的CHO配置信息。
在检测到无线连接失败时，终端设备以最近一次接收到的CHO配置信息进行无线连接恢复，而不以之前收到的CHO配置信息进行无线连接恢复。例如，所述之前收到的CHO配置信息可能配置终端设备在检测到无线连接失败时，通过发起MCG快速恢复流程进行无线连接恢复。
可选地，指示信息#1还可以包括一个条件，指示信息#1可以指示终端设备在检测到无线连接失败且该条件满足时，执行第一流程。
可选地，该条件可以是候选小区中存在信号质量大于第一阈值的小区，或者，该条件可以是SN的信号质量小于或等于第二阈值。
基于该方案，终端设备可能被同时配置多个机制进行无线连接恢复，在发生无线连接失败时，终端设备可能同时执行多个用于无线连接恢复的机制，这样可能会带来其他问题，或者终端设备不执行任一无线连接恢复的机制，这样将无法恢复无线连接。基于本申请的方案，MN可以指示终端设备在发生无线连接失败时，进行小区选择，并在所选择的小区属于候选小区时在所选择的小区中进行接入，从而终端设备可以基于MN的指示执行相应流程来恢复无线连接，避免了现有技术中的上述问题。另外，MN可以根据自身实际情况向终端设备指示用于无线连接恢复的机制，可以提高灵活性。
本申请还提供了另一种通信方法，该方法包括：MN向终端设备发送指示信息#2，该指示信息#2用于指示终端设备在检测到无线连接失败时，若没有检测到SCG失败，通过SN向MN发送MCG失败消息。
以下为了便于说明，将终端设备若没有检测到SCG失败，通过SN向MN发送MCG 失败消息这个过程称为：第二流程。
可选地，指示信息#2可以直接指示终端设备在检测到无线连接失败时执行第二流程。
示例性的，指示信息#2为通过CHO配置信息发送的，或者，指示信息#2为CHO配置信息。
进一步地，指示信息#2是终端设备最近一次接收到的CHO配置信息。
在检测到无线连接失败时，终端设备以最近一次接收到的CHO配置信息进行无线连接恢复，而不以之前收到的CHO配置信息进行无线连接恢复。例如，所述之前收到的CHO配置信息可能配置终端设备在检测到无线连接失败时，进行小区选择，并在所选择的小区属于候选小区时在所选择的小区中进行接入。
可选地，指示信息#2还可以包括一个条件，第二指示信息可以指示终端设备在终端设备在检测到无线连接失败且该条件满足时，执行第二流程。
该条件例如可以为，SN的信号质量大于第四阈值。
基于该方案，终端设备可能被同时配置多个机制进行无线连接恢复，在发生无线连接失败时，终端设备可能同时执行多个用于无线连接恢复的机制，这样可能会带来其他问题，或者终端设备不执行任一无线连接恢复的机制，这样将无法恢复无线连接。基于本申请的方案，MN可以指示终端设备在发生无线连接失败时，进行小区选择，并在所选择的小区属于候选小区时在所选择的小区中进行接入，从而终端设备可以基于MN的指示执行相应流程来恢复无线连接，避免了现有技术中的上述问题。另外，MN可以根据自身实际情况向终端设备指示用于无线连接恢复的机制，可以提高灵活性。
需要说明的是，协议中还可以规定：当终端设备被同时配置多个机制进行无线连接恢复，终端设备只执行其中的一个机制。比如当终端设备检测到无线连接失败时，终端设备执行如下流程：终端设备进行小区选择，并在所选择的小区属于候选小区时在所选择的小区中进行接入，如果在所选择的小区不属于候选小区时，终端设备进行RRC重建。或者执行的流程为：终端设备检测SCG是否发生了失败，如果SCG失败了，则终端设备进行RRC重建。如果SCG没有失败，则终端设备通过SN向MN发送SCG失败消息，发起MCG快速恢复流程。
现有技术提出了一种SN的条件增加或改变或修改，即MN或SN可以利用CHO机制来配置SN的增加或改变或修改。MN或SN在源链路质量较好时向终端设备发送CHO配置信息，CHO配置信息中可以包括SN增加或改变或修改的CHO触发条件和一个或多个SN的候选小区的信息，其中候选小区的信息可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。终端设备在接收到该SN增加或改变或修改的CHO配置信息后，根据该CHO配置信息判断候选小区是否满足CHO触发条件，将满足CHO触发条件的某候选小区作为目标小区。然后，终端设备与确定出的目标小区进行随机接入过程，当随机接入成功完成，终端设备给目标小区发送RRC消息(如RRC重配置完成消息)，通知目标小区条件切换完成。该CHO的流程中终端设备不需要发送SN信号质量的测量报告也不需要等待切换命令才切换SN对应的小区，从而能够提高接入到候选小区的成功率。
另外，现有技术中，在MR-DC场景中，当终端设备检测到SCG失败之后，终端设备 暂停SCG中无线承载的传输，终端设备可以向MN发送SCG失败消息，而无需引发RRC重建。MN收到SCG失败消息之后，MN可以进行相关处理，比如MN可以进行SN改变或释放SN或对SN进行修改，之后MN才会给终端设备发送响应消息，该响应消息中把之前在SCG中的无线承载迁移到其他的SN或者迁移到MN中或者修改。终端设备收到MN的响应消息之后，才会重新开启对之前在SCG的承载对应的业务的传输(利用响应消息中的无线配置信息)。所以对于这些业务而言，会有传输中断。
本申请提出了一种通信方法，该方法中，当SN失败时，终端设备可以先判断候选小区的信号质量，如果信号质量较好，则终端设备可以直接切换到候选小区，切换到候选小区之后，可以直接在候选小区进行数据通信(利用之前候选小区对应的无线配置信息)，而无需先暂停SCG中承载的传输，减少了业务中断的时间。下面结合图8对该方案进行说明。
图8是本申请提供的一种通信方法的示意性流程图。下面对各步骤进行说明。
S810，MN或SN向终端设备发送配置信息。
该配置信息可以包括一个或多个SN的候选小区的信息。候选小区的信息例如可以包括候选小区的小区全球标识(cell global identifier，CGI)，或者，候选小区的物理小区标识(physical cell identifier，PCI)以及候选小区对应的频率信息。
示例性的，该配置信息可以是SN增加或改变或修改的CHO配置信息。
S820，终端设备检测到SCG失败。
SCG失败的检测机制同S440。
S830，终端设备判断是否存在满足第八条件的候选小区。
所述候选小区是MN或SN向终端设备发送的SN增加或改变或修改的CHO配置信息中的SN的候选小区。
终端设备判断是否存在满足第八条件的候选小区。若存在，则执行S840；否则，即没有一个候选小区的信号质量满足第八条件，执行S850。
示例性的，第八条件可以是小区的信号质量大于一定门限。
S840，终端设备在目标小区中进行接入。应理解，这里的目标小区是满足第八条件的候选小区。
示例性的，终端设备在目标小区中进行接入是指终端设备发送RRC重配完成消息给目标小区。可选地，在发送RRC重配消息之前，可能需要先经过随机接入过程。
可选地，若终端设备在目标小区中的接入失败，终端设备可以执行S850以及后续相应步骤。
可选地，当目标小区所属的SN基站和终端设备之前的SN基站不同时，目标小区所属的基站给MN发送一个消息，通知终端设备已经接入到目标小区所述的SN基站。
可选地，当终端设备成功接入到目标小区时，如果终端设备检测到了无线连接失败(参见步骤S420中无线连接失败的描述)，则终端设备可以通过目标小区所属的SN把MCG失败消息发送给MN。具体步骤参见S450a～S450e。
S850，终端设备给MN发送SCG失败指示信息。
MN收到SCG失败指示信息之后，MN可以进行相关处理，比如改变SN或释放SN。
可选地，在S840之前，该方法还可以包括：MN向终端设备发送指示信息，该指示 信息指示终端设备在检测到SCG失败时，判断是否存在满足第八条件的候选小区，如果存在，则在满足第八条件的候选小区中进行接入。示例性的，第八条件可以在该指示信息中携带，本申请对次不作限定。比如，第八条件也可以通过CHO配置信息携带。
本申请中所涉及的指示信息，如第一指示信息、第二指示信息、第三指示信息等都可以是RRC消息，但本申请对此不作限定。
以上，结合图4至图9详细说明了本申请实施例提供的方法。以下，结合图9至图11详细说明本申请实施例提供的装置。
图9是本申请实施例提供的通信装置的示意性框图。如图9所示，该通信装置1000可以包括处理单元1010和收发单元1020。
在一种可能的设计中，该通信装置1000可对应于上述方法实施例中的终端设备。该通信装置1000可以用于执行上述任一实施例中的终端设备所执行的操作。
一种方式中，处理单元1010在检测到无线连接失败时，进行小区选择；该处理单元1010还用于，若目标小区属于主节点MN预配置的候选小区，在所述目标小区中进行接入；若所述目标小区不属于所述候选小区，且没有检测到辅小区组SCG失败，收发单元1020用于通过辅节点SN向所述MN发送主小区组MCG失败消息；其中，所述目标小区为所述处理单元1010进行小区选择所选择到的小区。
可选地，若所述目标小区不属于所述候选小区，且收发单元1020检测到所述SCG失败，收发单元1020还用于，向所述目标小区发送无线资源控制RRC重建请求消息。
可选地，收发单元1020还用于：接收所述MN发送的第一指示信息；
其中，所述第一指示信息用于指示所述处理单元1010在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一条件用于指示所述处理单元1010在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一指示信息还用于指示所述处理单元1010在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入。
可选地，所述第一条件包括下述中的一项或多项：所述候选小区中存在信号质量大于第一阈值的小区，或者，所述SN的信号质量小于或等于第二阈值。
可选地，收发单元1020还用于：接收所述MN发送的第二指示信息；
其中，所述第二指示信息用于指示所述收发单元1020在处理单元1010所选择到的小区不属于所述候选小区时，可以通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第二指示信息包括第二条件，所述第二条件用于指示所述收发单元1020在处理单元1010所选择到的小区不属于所述候选小区，且满足所述第二条件时，可以通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第二指示信息包括第二条件，所述第二指示信息还指示所述收发单元1020在处理单元1010所选择到的小区不属于所述候选小区，且满足所述第二条件时，可以通过所述SN向所述MN发送所述MCG失败消息。
可选地，所述第二条件包括下述中的一项或多项：所述所选择到的小区的信号质量小于第三阈值，或者，所述SN的信号质量大于第四阈值。
可选地，若所述通信装置1000所述目标小区中进行的接入失败，且处理单元1010没有检测到所述SCG失败，收发单元1020还用于，通过所述SN向所述MN发送所述MCG失败消息。
可选地，所述处理单元1010检测到无线连接失败包括下述情况中的一项或多项：
所述MCG发生无线链路失败；
所述MCG发生切换失败；
无线资源控制RRC重配失败；或者，
所述处理单元1010对信令无线承载SRB1或SRB2接收到的数据包进行完整性校验失败。
另一种方式中，当处理单元1010检测到无线连接失败时，没有检测到辅小区组SCG失败，收发单元1020通过辅节点SN向主节点MN发送主小区组MCG失败消息；若处理单元1010检测到所述SCG失败，进行小区选择；若目标小区属于所述MN预配置的候选小区，所述处理单元1010在所述目标小区中进行接入，其中，所述目标小区为所述处理单元1010进行小区选择所选择到的小区。
可选地，若所述目标小区不属于所述候选小区，收发单元1020还用于，向所述目标小区发送无线资源控制RRC重建请求消息。
可选地，收发单元1020还用于接收所述MN发送的第三指示信息；
其中，所述第三指示信息用于指示所述处理单元1010在检测到无线连接失败时，收发单元1020可以优先通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第三指示信息包括第三条件，所述第三条件用于指示所述处理单元1010在检测到无线连接失败且满足所述第三条件时，收发单元1020可以优先通过所述SN向所述MN发送所述MCG失败消息，或者，
所述第三指示信息包括第三条件，所述第三指示信息用于指示所述处理单元1010在检测到无线连接失败且满足所述第三条件时，收发单元1020可以优先通过所述SN向所述MN发送所述MCG失败消息。
可选地，所述第三条件包括：所述SN的信号质量大于或等于第二阈值。
可选地，收发单元1020还用于，接收所述MN发送的第四指示信息；
其中，所述第四指示信息用于指示所述收发单元1020在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，处理单元1010可以在所述候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四条件指示所述收发单元1020在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件时，处理单元1010可以在所述候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四指示信息指示所述收发单元1020在不能通过所述辅SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件成立时，处理单元1010可以在所述候选小区中进 行接入。
可选地，所述第四条件包括：所述候选小区中存在信号质量大于或等于第五阈值。
可选地，处理单元1010检测到无线连接失败包括下述情况中的一项或多项：
所述MCG发生无线链路失败；
所述MCG发生切换失败；
无线资源控制RRC重配失败；
所述处理单元1010对信令无线承载SRB1或SRB2接收到的数据包进行完整性校验失败。
应理解，该通信装置1000可对应于上述方法实施例中的终端设备，该通信装置1000可以包括用于执行上述方法实施例中由终端设备执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了实现上述各方法实施例中的相应流程。应理解，各单元执行上述方法实施例中的相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
在另一种可能的设计中，该通信装置1000可对应于上文方法实施例中的MN。该通信装置1000可以用于执行上述任一实施例中的MN所执行的操作。
一种方式中，处理单元1010用于，生成第一指示信息；收发单元1020用于，向终端设备发送所述第一指示信息；
其中，所述第一指示信息用于指示所述终端设备在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于候选小区时，在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一条件用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时，在所述所选择的小区中进行接入，或者，
所述第一指示信息包括第一条件，所述第一指示信息还用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时，在所述所选择的小区中进行接入，
所述候选小区为所述通信装置1000为所述终端设备预配置的小区。
可选地，所述第一条件包括下述中的一项或多项：所述候选小区中存在信号质量大于第一阈值的小区，或者，辅节点SN的信号质量小于或等于第二阈值。
可选地，处理单元1010还用于，生成第二指示信息；发送单元1020还用于，向所述终端设备发送所述第二指示信息；其中，所述第二指示信息用于指示所述终端设备在所选择到的小区不属于所述候选小区时，可以通过辅节点SN向所述通信装置1000发送主小区组MCG失败消息，或者，
所述第二指示信息第二条件，所述第二条件用于指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，可以通过所述SN向所述通信装置1000发送所述MCG失败消息，或者，
所述第二指示信息包括第二条件，所述第二指示信息指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，可以通过所述SN向所述通信装置1000发送所述MCG失败消息。
可选地，所述第二条件包括下述中的一项或多项：所述所选择到的小区的信号质量小 于第三阈值，或者，所述SN的信号质量大于或等于第四阈值。
在另一种方式中，处理单元1010用于，生成第三指示信息；发送单元1020，用于向终端设备发送所述第三指示信息；其中，所述第三指示信息用于指示终端设备在检测到无线连接失败时，可以优先通过辅节点SN向所述通信装置1000发送主小区组MCG失败消息，或者，所述第三指示信息包括第三条件，所述第三条件用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，可以优先通过所述SN向所述通信装置1000发送所述MCG失败消息，或者，所述第三指示信息包括第三条件，所述第三指示信息用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，可以优先通过所述SN向所述通信装置1000发送所述MCG失败消息。
可选地，所述第三条件包括：所述SN的信号质量大于或等于第二阈值。
处理单元1010还用于，生成第四指示信息；发送单元1020还用于，向所述终端设备发送所述第四指示信息；
其中，所述第四指示信息用于指示所述终端设备在不能通过所述SN向所述通信装置1000发送所述MCG失败消息或者没有收到所述通信装置1000对所述MCG失败消息的响应时，可以在候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四条件指示所述终端设备在不能通过所述SN向所述通信装置1000发送所述MCG失败消息或者没有收到所述通信装置1000对所述MCG失败消息的响应，且满足所述第四条件时，可以在所述候选小区中进行接入，或者，
所述第四指示信息包括第四条件，所述第四指示信息指示所述终端设备在不能通过所述辅SN向所述通信装置1000发送所述MCG失败消息或者没有收到所述通信装置1000对所述MCG失败消息的响应，且满足所述第四条件成立时，可以在所述候选小区中进行接入；
所述候选小区为所述通信装置1000为所述终端设备预配置的小区。
可选地，所述第四条件包括：所述候选小区中存在信号质量大于或等于第五阈值。
应理解，该通信装置1000可对应于上述方法实施例中的MN，该通信装置1000可以包括用于执行上述方法实施例中由MN执行的方法的单元。并且，该通信装置1000中的各单元和上述其他操作和/或功能分别为了实现上述各方法实施例中的相应流程。应理解，各单元执行上述方法实施例中的相应步骤的具体过程在上述方法实施例中已经详细说明，为了简洁，在此不再赘述。
还应理解，该通信装置1000为配置于网络设备中的芯片时，该通信装置1000中的收发单元1020可以为输入/输出接口。
图10是本申请实施例提供的一种网络设备的结构示意图，如可以为基站的结构示意图。如图10所示，该网络设备可实现上述方法实施例中MN的功能。网络设备1100可包括一个或多个DU 1101和一个或多个CU 1102。CU1102可以与下一代核心网(NG core，NC)通信。所述DU 1101可以包括至少一个天线11011，至少一个射频单元11012，至少一个处理器11013和至少一个存储器11014。所述DU 1101部分主要用于射频信号的收发以及射频信号与基带信号的转换，以及部分基带处理。CU1102可以包括至少一个处理器11022和至少一个存储器11021。CU1102和DU1101之间可以通过接口进行通信，其中， 控制面(control plane)接口可以为Fs-C，比如F1-C，用户面(user plane)接口可以为Fs-U，比如F1-U。
所述CU 1102部分主要用于进行基带处理，对基站进行控制等。所述DU 1101与CU 1102可以是物理上设置在一起，也可以物理上分离设置的，即分布式基站。所述CU 1102为基站的控制中心，也可以称为处理单元，主要用于完成基带处理功能。例如所述CU 1102可以用于控制基站执行上述方法实施例中关于MN的操作流程。
具体的，CU和DU上的基带处理可以根据无线网络的协议层划分，例如分组数据汇聚层协议(packet data convergence protocol，PDCP)层及以上协议层的功能设置在CU，PDCP以下的协议层，例如无线链路控制(radio link control，RLC)层和介质接入控制(medium access control，MAC)层等中的一个或多个协议层的功能设置在DU。又例如，CU实现无线资源控制(radio resource control，RRC)，分组数据汇聚层协议(packet data convergence protocol，PDCP)层的功能，DU实现无线链路控制(radio link control，RLC)、MAC和物理(physical，PHY)层的功能。
此外，可选的，网络设备1100可以包括一个或多个射频单元(RU)，一个或多个DU和一个或多个CU。其中，DU可以包括至少一个处理器11013和至少一个存储器11014，RU可以包括至少一个天线11011和至少一个射频单元11012，CU可以包括至少一个处理器11022和至少一个存储器11021。
在一个实例中，所述CU1102可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如5G网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述存储器11021和处理器11022可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。所述DU1101可以由一个或多个单板构成，多个单板可以共同支持单一接入指示的无线接入网(如5G网)，也可以分别支持不同接入制式的无线接入网(如LTE网，5G网或其他网)。所述存储器11014和处理器11013可以服务于一个或多个单板。也就是说，可以每个单板上单独设置存储器和处理器。也可以是多个单板共用相同的存储器和处理器。此外每个单板上还可以设置有必要的电路。
图11是本申请实施例提供的终端设备1200的结构示意图。该终端设备1200可执行上述方法实施例中终端设备的功能。如图11所示，该终端设备1200包括处理器1210和收发器1220。可选地，该终端设备1200还包括存储器1230。其中，处理器1210、收发器1220和存储器1230之间可以通过内部连接通路互相通信，传递控制和/或数据信号，该存储器1230用于存储计算机程序，该处理器1210用于从该存储器1230中调用并运行该计算机程序，以控制该收发器1220收发信号。可选地，终端设备1200还可以包括天线1240，用于将收发器1220输出的上行数据或上行控制信令通过无线信号发送出去。
上述处理器1210可以和存储器1230可以合成一个处理装置，处理器1210用于执行存储器1230中存储的程序代码来实现上述功能。具体实现时，该存储器1230也可以集成在处理器1210中，或者独立于处理器1210。该处理器1210可以与图16中的处理单元对应。
上述收发器1220可以与图9中的收发单元对应，也可以称为收发单元。收发器1220 可以包括接收器(或称接收机、接收电路)和发射器(或称发射机、发射电路)。其中，接收器用于接收信号，发射器用于发射信号。
应理解，图11所示的终端设备1200能够实现上述方法实施例中涉及终端设备的各个过程。终端设备1200中的各个模块的操作和/或功能，分别为了实现上述方法实施例中的相应流程。具体可参见上述方法实施例中的描述，为避免重复，此处适当省略详细描述。
上述处理器1210可以用于执行前面方法实施例中描述的由终端设备内部实现的动作，而收发器1220可以用于执行前面方法实施例中描述的终端设备向MN发送或从MN接收的动作。具体请见前面方法实施例中的描述，此处不再赘述。
可选地，上述终端设备1200还可以包括电源1250，用于给终端设备中的各种器件或电路提供电源。
除此之外，为了使得终端设备的功能更加完善，该终端设备1200还可以包括输入单元1260、显示单元1270、音频电路1280、摄像头1290和传感器1310等中的一个或多个，所述音频电路还可以包括扬声器1282、麦克风1284等中的一个或多个。
本申请实施例还提供了一种处理装置，包括处理器和接口；所述处理器用于执行上述方法实施例中的方法。
应理解，上述处理装置可以是一个或多个芯片。例如，该处理装置可以是现场可编程门阵列(field programmable gate array，FPGA)，可以是专用集成芯片(application specific integrated circuit，ASIC)，还可以是系统芯片(system on chip，SoC)，还可以是中央处理器(central processor unit，CPU)，还可以是网络处理器(network processor，NP)，还可以是数字信号处理电路(digital signal processor，DSP)，还可以是微控制器(micro controller unit，MCU)，还可以是可编程控制器(programmable logic device，PLD)或其他集成芯片。
在实现过程中，上述方法的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。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，处理器读取存储器中的信息，结合其硬件完成上述方法的步骤。为避免重复，这里不再详细描述。
应理解，本申请实施例中的处理器可以是一种集成电路芯片，具有信号的处理能力。在实现过程中，上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor，DSP)、专用集成电路(application specific integrated circuit，ASIC)、现场可编程门阵列(field programmable gate array，FPGA)或者其它可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件。
可以理解，本申请实施例中的存储器可以是易失性存储器或非易失性存储器，或可包括易失性和非易失性存储器两者。其中，非易失性存储器可以是只读存储器(read-only memory，ROM)、可编程只读存储器(programmable ROM，PROM)、可擦除可编程只读存储器(erasable PROM，EPROM)、电可擦除可编程只读存储器(electrically EPROM，EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory，RAM)， 其用作外部高速缓存。通过示例性但不是限制性说明，许多形式的RAM可用，例如静态随机存取存储器(static RAM，SRAM)、动态随机存取存储器(dynamic RAM，DRAM)、同步动态随机存取存储器(synchronous DRAM，SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM，DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM，ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM，SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM，DR RAM)。应注意，本文描述的系统和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
本申请还提供了一种计算机可读介质，其上存储有计算机程序，该计算机程序被计算机执行时实现上述任一方法实施例的功能。
本申请还提供了一种计算机程序产品，该计算机程序产品被计算机执行时实现上述任一方法实施例的功能。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，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(digital subscriber line，DSL))或无线(例如红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。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，高密度数字视频光盘(digital video disc，DVD))、或者半导体介质(例如，固态硬盘(solid state disk，SSD))等。
应理解，说明书通篇中提到的“实施例”意味着与实施例有关的特定特征、结构或特性包括在本申请的至少一个实施例中。因此，在整个说明书各个实施例未必一定指相同的实施例。此外，这些特定的特征、结构或特性可以任意适合的方式结合在一个或多个实施例中。应理解，在本申请的各种实施例中，上述各过程的序号的大小并不意味着执行顺序的先后，各过程的执行顺序应以其功能和内在逻辑确定，而不应对本申请实施例的实施过程构成任何限定。
应理解，本申请中，“大于”可以替换为“大于或等于”，“小于”可以替换为“小于或等于”。
还应理解，在本申请中，“当…时”、“若”以及“如果”均指在某种客观情况下UE或者基站会做出相应的处理，并非是限定时间，且也不要求UE或基站实现时一定要有判断的动作，也不意味着存在其它限定。
另外，本文中术语“系统”和“网络”在本文中常被可互换使用。本文中术语“和/或”，仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，例如，A和/或B，可以表示：单独存在A，同时存在A和B，单独存在B这三种情况。
本文中术语“……中的至少一个”或“……中的至少一种”，表示所列出的各项的全部或 任意组合，例如，“A、B和C中的至少一种”，可以表示：单独存在A，单独存在B，单独存在C，同时存在A和B，同时存在B和C，同时存在A、B和C这六种情况。
应理解，在本申请各实施例中，“与A相应的B”表示B与A相关联，根据A可以确定B。但还应理解，根据A确定B并不意味着仅仅根据A确定B，还可以根据A和/或其它信息确定B。
本领域普通技术人员可以意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到，为描述的方便和简洁，上述描述的系统、装置和单元的具体工作过程，可以参考前述方法实施例中的对应过程，在此不再赘述。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统、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，所述单元的划分，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连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述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。
所述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，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(read-only memory，ROM)、随机存取存储器(random access memory，RAM)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，仅为本申请的具体实施方式，但本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，都应涵盖在本申请的保护范围之内。因此，本申请的保护范围应以所述权利要求的保护范围为准。

Claims (27)

  1. 一种通信方法，其特征在于，包括：
    当终端设备检测到无线连接失败时，所述终端设备进行小区选择；
    若目标小区属于主节点MN预配置的候选小区，所述终端设备在所述目标小区中进行接入；
    若所述目标小区不属于所述候选小区，且没有检测到辅小区组SCG失败，所述终端设备通过辅节点SN向所述MN发送主小区组MCG失败消息；
    其中，所述目标小区为所述终端设备进行小区选择所选择到的小区，所述辅小区组SCG为一组与辅节点SN关联的小区，主小区组MCG为一组与所述MN关联的小区。
  2. 如权利要求1所述的方法，其特征在于，所述方法还包括：
    若所述目标小区不属于所述候选小区，且检测到所述SCG失败，所述终端设备向所述目标小区发送无线资源控制RRC重建请求消息。
  3. 如权利要求1或2所述的方法，其特征在于，在所述终端设备进行小区选择之前，所述方法还包括：
    所述终端设备接收所述MN发送的第一指示信息；
    其中，所述第一指示信息用于指示所述终端设备在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入，或者，
    所述第一指示信息包括第一条件，所述第一条件用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入，或者，
    所述第一指示信息包括第一条件，所述第一指示信息还用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时在所述所选择的小区中进行接入。
  4. 如权利要求3所述的方法，其特征在于，所述第一条件包括以下中的一项或多项：
    所述候选小区中存在信号质量大于或等于第一阈值的小区，或者，所述SN的信号质量小于或等于第二阈值。
  5. 如权利要求1至4中任一项所述的方法，其特征在于，在所述终端设备通过所述SN向所述MN发送主小区组MCG失败消息之前，所述方法还包括：
    所述终端设备接收所述MN发送的第二指示信息；
    其中，所述第二指示信息用于指示所述终端设备在所选择到的小区不属于所述候选小区时，通过所述SN向所述MN发送所述MCG失败消息，或者，
    所述第二指示信息包括第二条件，所述第二条件用于指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述MCG失败消息，或者，
    所述第二指示信息包括第二条件，所述第二指示信息还指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述 MCG失败消息。
  6. 如权利要求5所述的方法，其特征在于，所述第二条件包括以下中的一项或多项：
    所述所选择到的小区的信号质量小于或等于第三阈值，或者，所述SN的信号质量大于或等于第四阈值。
  7. 如权利要求1至6中任一项所述的方法，其特征在于，所述方法还包括：
    若所述终端设备在所述目标小区中进行的接入失败，且没有检测到所述SCG失败，所述终端设备通过所述SN向所述MN发送所述MCG失败消息。
  8. 如权利要求1至7中任一项所述的方法，其特征在于，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：
    所述MCG发生无线链路失败；
    所述MCG发生切换失败；
    无线资源控制RRC重配失败；或，
    所述终端设备对信令无线承载SRB1或SRB2中的一项或多项接收到的数据包进行完整性校验失败。
  9. 一种通信方法，其特征在于，包括：
    主节点MN生成第一指示信息；
    所述MN向终端设备发送所述第一指示信息；
    其中，所述第一指示信息用于指示所述终端设备在检测到无线连接失败时，优先进行小区选择，并且在所选择的小区属于候选小区时，在所述所选择的小区中进行接入，或者，
    所述第一指示信息包括第一条件，所述第一条件用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时，在所述所选择的小区中进行接入，或者，
    所述第一指示信息包括第一条件，所述第一指示信息还用于指示所述终端设备在检测到无线连接失败且满足所述第一条件时，优先进行小区选择，并且在所选择的小区属于所述候选小区时，在所述所选择的小区中进行接入，
    所述候选小区为所述MN为所述终端设备预配置的小区。
  10. 如权利要求9所述的方法，其特征在于，所述第一条件包括以下中的一项或多项：
    所述候选小区中存在信号质量大于或等于第一阈值的小区，或者，辅节点SN的信号质量小于或等于第二阈值。
  11. 如权利要求9或10所述的方法，其特征在于，所述方法还包括：
    所述MN生成第二指示信息；
    所述MN向所述终端设备发送所述第二指示信息；
    其中，所述第二指示信息用于指示所述终端设备在所选择到的小区不属于所述候选小区时，通过辅节点SN向所述MN发送主小区组MCG失败消息，或者，
    所述第二指示信息第二条件，所述第二条件用于指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述MCG失败消息，或者，
    所述第二指示信息包括第二条件，所述第二指示信息指示所述终端设备在所选择到的小区不属于所述候选小区，且满足所述第二条件时，通过所述SN向所述MN发送所述 MCG失败消息。
  12. 如权利要求11所述的方法，其特征在于，所述第二条件包括以下中的一项或多项：
    所述所选择到的小区的信号质量小于或等于第三阈值，或者，所述SN的信号质量大于或等于第四阈值。
  13. 一种通信方法，其特征在于，包括：
    当终端设备检测到无线连接失败时，若没有检测到辅小区组SCG失败，所述终端设备通过辅节点SN向主节点MN发送主小区组MCG失败消息；
    若检测到所述SCG失败，所述终端设备进行小区选择；
    若目标小区属于所述MN预配置的候选小区，所述终端设备在所述目标小区中进行接入，其中，所述目标小区为所述终端设备进行小区选择所选择到的小区，其中，SCG为与SN关联的一组小区，MCG为与MN关联的一组小区。
  14. 如权利要求13所述的方法，其特征在于，所述方法还包括：
    若所述目标小区不属于所述候选小区，所述终端设备向所述目标小区发送无线资源控制RRC重建请求消息。
  15. 如权利要求13或14所述的方法，其特征在于，在所述终端设备通过辅节点SN向主节点MN发送主小区组MCG失败消息之前，所述方法还包括：
    所述终端设备接收所述MN发送的第三指示信息；
    其中，所述第三指示信息用于指示所述终端设备在检测到无线连接失败时，优先通过所述SN向所述MN发送所述MCG失败消息，或者，
    所述第三指示信息包括第三条件，所述第三条件用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，优先通过所述SN向所述MN发送所述MCG失败消息，或者，
    所述第三指示信息包括第三条件，所述第三指示信息用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，优先通过所述SN向所述MN发送所述MCG失败消息。
  16. 如权利要求15所述的方法，其特征在于，所述第三条件包括：所述SN的信号质量大于或等于第二阈值。
  17. 如权利要求13至16中任一项所述的方法，其特征在于，在所述终端设备在所述目标小区中进行接入之前，所述方法还包括：
    所述终端设备接收所述MN发送的第四指示信息；
    其中，所述第四指示信息用于指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，在所述候选小区中进行接入，或者，
    所述第四指示信息包括第四条件，所述第四条件指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件时，在所述候选小区中进行接入，或者，
    所述第四指示信息包括第四条件，所述第四指示信息指示所述终端设备在不能通过所述辅SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消 息的响应，且满足所述第四条件成立时，在所述候选小区中进行接入。
  18. 如权利要求17所述的方法，其特征在于，所述第四条件包括：所述候选小区中存在信号质量大于或等于第五阈值的小区。
  19. 权利要求13至18中任一项所述的方法，其特征在于，所述终端设备检测到无线连接失败包括下述情况中的一项或多项：
    所述MCG发生无线链路失败；
    所述MCG发生切换失败；
    无线资源控制RRC重配失败；
    所述终端设备对信令无线承载SRB1或SRB2中的一项或多项接收到的数据包进行完整性校验失败。
  20. 一种通信方法，其特征在于，包括：
    主节点MN生成第三指示信息；
    所述MN向终端设备发送所述第三指示信息；
    其中，所述第三指示信息用于指示终端设备在检测到无线连接失败时，优先通过辅节点SN向所述MN发送主小区组MCG失败消息，或者，
    所述第三指示信息包括第三条件，所述第三条件用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，优先通过所述SN向所述MN发送所述MCG失败消息，或者，
    所述第三指示信息包括第三条件，所述第三指示信息用于指示所述终端设备在检测到无线连接失败且满足所述第三条件时，优先通过所述SN向所述MN发送所述MCG失败消息，
    其中，MCG为与MN关联的一组小区。
  21. 权利要求20所述的方法，其特征在于，所述第三条件包括：
    所述SN的信号质量大于或等于第二阈值。
  22. 如权利要求20或21所述的方法，其特征在于，所述方法还包括：
    所述MN生成第四指示信息；
    所述MN向所述终端设备发送所述第四指示信息；
    其中，所述第四指示信息用于指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应时，在候选小区中进行接入，或者，
    所述第四指示信息包括第四条件，所述第四条件指示所述终端设备在不能通过所述SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件时，在所述候选小区中进行接入，或者，
    所述第四指示信息包括第四条件，所述第四指示信息指示所述终端设备在不能通过所述辅SN向所述MN发送所述MCG失败消息或者没有收到所述MN对所述MCG失败消息的响应，且满足所述第四条件成立时，在所述候选小区中进行接入；
    所述候选小区为所述MN为所述终端设备预配置的小区。
  23. 如权利要求22所述的方法，其特征在于，所述第四条件包括：
    所述候选小区中存在信号质量大于或等于第五阈值的小区。
  24. 一种通信装置，其特征在于，所述装置用于执行如权利要求1-8中任一项、9-12中任一项、13-19中任一项、或者20-23任一项所述的方法。
  25. 一种装置，其特征在于，包括：处理器，所述处理器与存储器耦合，所述存储器用于存储程序或指令，当所述程序或指令被所述处理器执行时，使得所述装置执行如权利要求1-8中任一项、9-12中任一项、13-19中任一项、或者20-23中任一项所述的方法。
  26. 一种可读存储介质，其上存储有计算机程序或指令，其特征在于，所述计算机程序或指令被执行时使得计算机执行如权利要求1至23中任一项所述的方法。
  27. 一种通信系统，其特征在于，包括如权利要求25中执行如权利要求1-8中任一项所述方法的装置，执行如权利要求9-12中任一项所述方法的装置，执行如权利要求13-19中任一项所述方法的装置，执行权利要求20-23中任一项所述方法的装置中的一项或多项。
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"3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and NR; Multi-connectivity; Stage 2 (Release 15)", 3GPP STANDARD; TECHNICAL SPECIFICATION; 3GPP TS 37.340, 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. V15.6.0, 28 June 2019 (2019-06-28), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, pages 1 - 69, XP051754444 *
3GPP TS 36.331
INTERDIGITAL INC.: "Discussion on Handling Split SRB during SCG Failure", 3GPP DRAFT; R2-1802818 (R15 NR WI AI104152 SPLITSRBSCGFAILURE), 3RD GENERATION PARTNERSHIP PROJECT (3GPP), MOBILE COMPETENCE CENTRE ; 650, ROUTE DES LUCIOLES ; F-06921 SOPHIA-ANTIPOLIS CEDEX ; FRANCE, vol. RAN WG2, no. Athens, Greece; 20180226 - 20180302, 16 February 2018 (2018-02-16), Mobile Competence Centre ; 650, route des Lucioles ; F-06921 Sophia-Antipolis Cedex ; France, XP051400256 *

Cited By (3)

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Publication number Priority date Publication date Assignee Title
CN113366885A (zh) * 2021-05-07 2021-09-07 北京小米移动软件有限公司 一种释放远端终端设备的方法及其装置
WO2023273926A1 (zh) * 2021-07-01 2023-01-05 华为技术有限公司 一种多连接下的通信方法及装置
WO2024093931A1 (zh) * 2022-11-04 2024-05-10 华为技术有限公司 一种通信方法及装置

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