WO2023179736A1 - 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
WO2023179736A1
WO2023179736A1 PCT/CN2023/083505 CN2023083505W WO2023179736A1 WO 2023179736 A1 WO2023179736 A1 WO 2023179736A1 CN 2023083505 W CN2023083505 W CN 2023083505W WO 2023179736 A1 WO2023179736 A1 WO 2023179736A1
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WO
WIPO (PCT)
Prior art keywords
cell
terminal device
access network
report
network device
Prior art date
Application number
PCT/CN2023/083505
Other languages
English (en)
French (fr)
Inventor
王凡凡
耿婷婷
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
Priority claimed from CN202210942532.1A external-priority patent/CN116847418A/zh
Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Publication of WO2023179736A1 publication Critical patent/WO2023179736A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements

Definitions

  • the present application relates to the field of communication, and more specifically, to a communication method and a communication device.
  • MRO mobility robustness optimization
  • RLF radio link failure
  • Embodiments of the present application provide a communication method and a communication device, in order to improve the effect of network equipment on mobility management of terminal equipment.
  • a communication method is provided, which method can be executed by a terminal device or a module (such as a chip) configured in (or used for) the terminal device.
  • the method includes: redirecting a terminal device from a source cell to a target cell, where the source cell is managed by a source access network device, and the target cell is managed by a target access network device.
  • the terminal device sends a first report, where the first report includes information indicating potential failure when the terminal device performs a cell redirection process, and includes identification information of the target cell.
  • the terminal device sends a first report to the network device (such as the source access network device and/or the target access network device), notifying the terminal device that there is a risk of potential failure during the cell redirection process, so that the network device can perform the cell redirection.
  • the first report can be used as a reference when optimizing network parameters to reduce the probability of cell redirection failure of the terminal device, thereby improving the effectiveness of mobility management of the terminal device by the network device.
  • the first report includes a redirection success report, a random access report, or a connection establishment failure report.
  • the method further includes: when the terminal device redirection process satisfies a reporting condition, the terminal device records the first report, wherein the reporting condition includes One or more of the following conditions:
  • the running time of the first timer is less than or equal to the first threshold value and greater than or equal to the second threshold value.
  • the running time of the first timer is when the terminal device receives wireless resources from the source access network device.
  • the running time of the second timer is less than or equal to the third threshold value and greater than or equal to the fourth threshold value.
  • the running time of the second timer is when the terminal device receives the RRC release from the source access network device.
  • the running time of the third timer is less than or equal to the fifth threshold and greater than or equal to the sixth threshold.
  • the running time of the third timer is for the terminal device to send the RRC connection request message to the target access network device.
  • the terminal device fails to perform cell redirection at the first frequency point, and successfully performs cell redirection at a frequency point other than the first frequency point.
  • the first frequency point is the user configured by the source access network device for the terminal device.
  • the frequency point of the target cell is a frequency point other than the first frequency point.
  • the terminal device when the cell redirection process executed by the terminal device meets one or more of the above conditions 1, 2 or 4, it can be considered that there is a risk of potential failure in the cell redirection process of the terminal device, and the terminal device records
  • the first report can be sent to the network device so that the network device can refer to the first report to optimize network parameters and improve the effect of mobility management of the terminal device by the network device.
  • the second threshold value is the product of the first threshold value and the first coefficient
  • the fourth threshold value is the third
  • the sixth threshold value is the product of the fifth threshold value and the third coefficient, where the first coefficient, the second coefficient and the third coefficient less than 1.
  • the method further includes: the terminal device receiving first indication information, the first indication information being used to indicate the reporting condition.
  • the network device can configure the reporting conditions for sending the first report to the terminal device, so that the terminal device can provide the network device with a report for network parameter optimization based on the configuration requirements of the network device.
  • the terminal device receiving the first indication information includes: the terminal device receiving an RRC message, the RRC message including the first indication information.
  • the RRC messages may include but are not limited to RRC Setup messages, RRC Reconfiguration messages, RRC Reestablishment messages, RRC Resume messages, RRC Release ( One or more types of RRC Release) messages.
  • the source access network device can notify the terminal device of the reporting conditions for sending the first report through an RRC message, so that the terminal device can record the report for network parameter optimization based on the configuration requirements of the network device and provide it to the network device.
  • the first report is used to indicate one or more of the following:
  • the reporting condition The reporting condition, the identification information of the source cell, the cell measurement information, the redirection frequency information, the identification information of the target cell, the frequency information of the target cell, the running time of the first timer, the second timer The running time of the timer, the running time of the third timer, or the running time of the fourth timer.
  • the identification information of the cell may include cell identification information, and the cell identification information may be a cell global identifier (CGI), a physical cell identifier (PCI), a frequency point, and a non-public network identifier (non-public identifier) of the cell.
  • CGI cell global identifier
  • PCI physical cell identifier
  • NTN ID non-public network identifier
  • the identification information of the cell may also include a tracking area code (TAC) and/or identification information of a network device to which the cell belongs, such as a global network device identification.
  • TAC tracking area code
  • the CGI may include a public land mobile network (PLMN ID) and a cell ID.
  • the cell measurement information includes one or more of the measurement information of the source cell, the measurement information of the target cell, the measurement information of neighboring cells of the source cell, or the measurement information of neighboring cells of the target cell.
  • the measurement information of the cell may include The terminal equipment measures the signal (such as the reference signal) of the cell and obtains the measurement result.
  • the running time of the fourth timer is the time between the terminal device receiving the RRC release message from the source access network device and the successful establishment of a service channel between the terminal device and the target access network device, or the running time of the fourth timer. It is the time between the terminal device receiving the RRC release message from the source access network device and the successful transmission of service data packets between the terminal device and the target access network device.
  • the first report may include one or more of the above information
  • the terminal device provides the network device with relevant information about terminal device redirection through the first report, so that the network device can refer to the information in the first report. Precisely optimize network parameters to improve the effectiveness of network equipment in mobility management of terminal devices.
  • the terminal device sending the first report includes: the terminal device sending the first report to the target access network device.
  • the first report may be a report sent to the target access network device, so that the target access network device can optimize the configuration of the target cell with reference to the first report.
  • the terminal device sending the first report includes: the terminal device sending the first report to the source access network device, the first report including the source cell identification information.
  • the first report may be a report sent to the source access network device, so that the source access network device can optimize the configuration of the source cell with reference to the first report.
  • the first report further includes second indication information, the second indication information is used to indicate that the cell redirection is triggered by traffic or triggered by signal coverage quality.
  • the service may be a voice service.
  • the terminal device notifies the network device whether the cell redirection is triggered by the service or by the signal coverage quality through the second indication information in the first report, so that the network device can determine the triggering of the cell redirection based on the second indication information.
  • the reason is to optimize network parameters more accurately and reduce unnecessary or wrong network parameter optimization.
  • the cell redirection is triggered by a service, and the target access network device and the source access network device adopt radio access technology (radio access technology, RAT) is different.
  • radio access technology radio access technology
  • the second aspect provides a communication method.
  • the beneficial effects can be found in the description of the first aspect and will not be described again here.
  • the method may be executed by the access network device or a module (such as a chip) configured in (or used for) the access network device.
  • the method includes: receiving a first report from a terminal device, the first report including information indicating a potential failure in performing a cell redirection process by the terminal device, and including identification information of a target cell redirected by the terminal device,
  • the target cell is managed by the target access network equipment.
  • the method further includes: sending the first report to the source access network device, where the first report includes the identification information of the source cell redirected by the terminal device, The source cell is managed by the source access network equipment.
  • the method further includes: adjusting network configuration parameters according to the first report.
  • the first report is used to indicate a reporting condition that triggers the terminal device to send the first report, and the reporting condition includes one or more of the following conditions:
  • the running time of the first timer is less than or equal to the first threshold value and greater than or equal to the second threshold value.
  • the running time of the first timer is when the terminal device receives radio resource control from the source access network device.
  • RRC release message to The length of time between the terminal device sending the random access preamble to the target access network device;
  • the running time of the second timer is less than or equal to the third threshold value and greater than or equal to the fourth threshold value.
  • the running time of the second timer is when the terminal device receives the RRC release from the source access network device.
  • the running time of the third timer is less than or equal to the fifth threshold and greater than or equal to the sixth threshold.
  • the running time of the third timer is for the terminal device to send the RRC connection request message to the target access network device.
  • the terminal device fails to perform cell redirection at the first frequency point, and successfully performs cell redirection at a frequency point other than the first frequency point.
  • the first frequency point is the user configured by the source access network device for the terminal device.
  • the frequency point of the target cell is a frequency point other than the first frequency point.
  • the source access network device manages the source cell redirected by the cell.
  • the second threshold value is the product of the first threshold value and the first coefficient
  • the fourth threshold value is the third The product of the threshold value and the second coefficient
  • the sixth threshold value is the product of the fifth threshold value and the third coefficient, where the first coefficient, the second coefficient and the third coefficient less than 1.
  • the first report is used to indicate one or more of the following:
  • the identification information of the source cell the identification information of the target cell, cell measurement information, the redirection frequency information, the frequency information of the target cell, the running time of the first timer, the running time of the second timer , the running time of the third timer or the running time of the fourth timer,
  • the cell measurement information includes one or more of the measurement information of the source cell, the measurement information of the target cell, the measurement information of neighboring cells of the source cell, or the measurement information of the target cell.
  • the operation of the fourth timer The duration is the duration between when the terminal device receives the RRC release message from the source access network device and when the terminal device successfully establishes a service channel with the target access network device, or the running duration of the fourth timer is when the terminal device receives the RRC release message from the source access network device.
  • the method further includes: sending first indication information to the terminal device, the first indication information being used to indicate the reporting condition.
  • sending the first indication information to the terminal device includes: sending an RRC message to the terminal device, the RRC message including the first indication information.
  • the first report further includes second indication information, the second indication information is used to indicate that the cell redirection is triggered by traffic or triggered by signal coverage quality.
  • the service may be a voice service.
  • the terminal device redirection is triggered by a service
  • the target access network device and the source access network device adopt different wireless access technologies RAT
  • the source access network device uses The access network equipment manages the source cell for redirection of the cell.
  • a communication method is provided, which method can be executed by a terminal device or a module (such as a chip) configured in (or used for) the terminal device.
  • the method includes: the terminal device fails to switch to the first cell.
  • the terminal device establishes a communication connection with the access network device in the second cell, and the access network device manages the second cell.
  • the terminal equipment sends a second report to the access network equipment.
  • the second report is used to indicate that the terminal equipment fails to switch to the first cell.
  • the second report includes fourth indication information.
  • the fourth indication The information is used to indicate that the switching of the terminal equipment to the first cell is triggered by services, Or triggered by signal coverage quality.
  • the service may be a voice service.
  • the second report is a wireless link failure report or a connection establishment failure report.
  • the terminal device after the terminal device performs cell switching, it sends a second report to the network device to notify the network device that the terminal device failed to switch to the first cell, so that the network device can refer to the second report to optimize network parameters.
  • the second report includes indication of handover reasons that trigger cell handover, which can improve the accuracy of network parameter optimization and reduce unnecessary or erroneous network parameter optimization.
  • the first cell and the second cell adopt the same radio access technology RAT.
  • the terminal device performs cell handover in a different-standard network (or different system) from the source cell, and the source access network device instructs the terminal device to switch to a first cell with a different RAT from the source cell. If the terminal equipment fails to switch to the first cell, the terminal equipment continues to perform cell selection on the network with the same standard (or system) as the network where the first cell is located to try to access the network. That is to say, the terminal equipment selects the RAT of the first cell. The same cell, if a suitable cell is successfully selected, that is, a second cell with the same RAT as the first cell, the terminal device establishes a communication connection with the access network device in the second cell. Therefore, the RAT of the second cell is the same as that of the first cell.
  • the first cell and the second cell adopt different radio access technologies RAT.
  • the source access network device instructs the terminal device to switch to a first cell with a different RAT from the source cell. If the terminal device fails to switch to the first cell, the terminal device continues to perform cell selection on a network with the same standard (or system) as the network where the first cell is located, and selects a cell that meets the conditions to try to access the network device. If it is an ordinary voice service, the satisfied conditions refer to the conditions of a suitable cell; if it is an emergency voice service, the satisfied conditions refer to the conditions of a suitable cell and an acceptable cell. If it is an emergency voice service, the terminal device first tries to select a suitable cell. If no suitable cell is selected, the terminal device can select an acceptable cell.
  • the terminal device does not select a cell that meets the conditions, and the terminal device re-establishes a connection with the source cell. That is, in this example, the second cell is the source cell of the terminal device, and the RAT of the second cell is different from that of the first cell.
  • a communication method is provided, which method can be executed by an access network device or a module (such as a chip) configured in (or used for) the access network device.
  • the method includes: receiving a second report from a terminal device, the second report being used to indicate that the terminal device fails to switch to the first cell, the second report including fourth indication information, the fourth indication information being Instructing the terminal equipment to switch to the first cell is triggered by service or signal coverage quality.
  • the fifth aspect provides a communication device.
  • the device may include a module that performs one-to-one correspondence with the methods/operations/steps/actions described in the first aspect.
  • the module may be a hardware circuit, or However, software can also be implemented by hardware circuits combined with software.
  • the device includes:
  • a processing unit configured to determine that the terminal device is redirected from the source cell to the target cell, where the source cell is managed by the source access network device, and the target cell is managed by the target access network device;
  • a transceiver unit configured to send a first report, where the first report includes information indicating a potential failure when the terminal device performs a cell redirection process, and includes identification information of the target cell.
  • the transceiver unit is specifically configured to send the first report when the cell redirection process satisfies the reporting condition.
  • the reporting conditions can refer to the previous description, and for the sake of simplicity, they will not be described again here.
  • the transceiver unit is also used to receive the first indication information,
  • the first indication information is used to indicate the reporting condition.
  • the transceiver unit is specifically configured to receive an RRC message, where the RRC message includes the first indication information.
  • the first report is used to indicate one or more of the following:
  • the reporting condition the identification information of the source cell, the identification information of the target cell, cell measurement information, the redirection frequency point, the frequency point of the target cell, the running time of the first timer, the running time of the second timer The running time, the running time of the third timer or the running time of the fourth timer.
  • the cell measurement information includes one or more of the measurement information of the source cell, the measurement information of the target cell, and the measurement information of neighboring cells of the source cell or the measurement information of neighboring cells of the target cell.
  • the operation of the fourth timer The duration is the duration between when the terminal device receives the RRC release message from the source access network device and when the terminal device successfully establishes a service channel with the target access network device, or the running duration of the fourth timer is when the terminal device receives the RRC release message from the source access network device.
  • the transceiver unit is specifically configured to send the first report to the target access network device.
  • the transceiver unit is specifically configured to send the first report to the source access network device, where the first report includes the identification information of the source cell.
  • the first report further includes second indication information, the second indication information is used to indicate that the cell redirection is triggered by traffic or triggered by signal coverage quality.
  • the service may be a voice service.
  • the terminal device sends the first report, including: the cell redirection is triggered by the voice service, the target access network device and the source access network device
  • the wireless access technologies used are different RATs.
  • the sixth aspect provides a communication device.
  • the device may include a module that performs one-to-one correspondence with the methods/operations/steps/actions described in the second aspect.
  • the module may be a hardware circuit, or However, software can also be implemented by hardware circuits combined with software.
  • the device includes: a transceiver unit configured to receive a first report from a terminal device, the first report including information indicating a potential failure in the terminal device executing a cell redirection process, and including the cell Identification information of the redirected target cell, which is managed by the target access network device.
  • the processing unit is configured to determine, based on the first report, that there is a potential failure in the terminal device executing the cell redirection process.
  • the transceiver unit is further configured to send the first report to the source access network device, where the first report includes the identification information of the source cell redirected by the cell,
  • the source cell is managed by the source access network equipment.
  • the processing unit is further configured to adjust network configuration parameters according to the first report.
  • the first report is used to indicate a reporting condition that triggers the terminal device to send the first report.
  • the reporting conditions can refer to the previous description, and for the sake of simplicity, they will not be described again here.
  • the first report is used to indicate one or more of the following:
  • the identification information of the source cell the identification information of the target cell, cell measurement information, the redirection frequency point, the frequency point of the target cell, the running time of the first timer, the running time of the second timer or the running time of the second timer.
  • the running time of the third timer is the identification information of the source cell, the identification information of the target cell, cell measurement information, the redirection frequency point, the frequency point of the target cell, the running time of the first timer, the running time of the second timer or the running time of the second timer.
  • the cell measurement information includes one or more of the measurement information of the source cell, the measurement information of the target cell, and the measurement information of neighboring cells of the source cell or the measurement information of neighboring cells of the target cell.
  • the operation of the fourth timer The duration is the duration between when the terminal device receives the RRC release message from the source access network device and when the terminal device successfully establishes a service channel with the target access network device, or the running duration of the fourth timer is when the terminal device receives the RRC release message from the source access network device.
  • the transceiver unit is further configured to send first indication information to the terminal device, where the first indication information is used to indicate the reporting condition.
  • the transceiver unit is specifically configured to send an RRC release message to the terminal device, where the RRC release message includes the first indication information.
  • the first report further includes second indication information, the second indication information is used to indicate that the cell redirection is triggered by traffic or triggered by measurement results.
  • the service can be a voice service
  • the cell redirection is triggered by a service
  • the target access network device and the source access network device adopt different radio access technologies RAT
  • the source access network device adopts a different radio access technology RAT.
  • the network access device manages the source cell for redirection of the cell.
  • the seventh aspect provides a communication device.
  • the device may include a module that performs one-to-one correspondence with the methods/operations/steps/actions described in the third aspect.
  • the module may be a hardware circuit, or However, software can also be implemented by hardware circuits combined with software.
  • the device includes: a processing unit, configured to determine that the terminal equipment fails to switch to the first cell. And, the processing unit is also used to determine that the terminal equipment establishes a communication connection with the second cell.
  • a transceiver unit configured to send a second report to the access network device. The second report is used to indicate that the terminal device fails to switch to the first cell.
  • the second report includes fourth indication information. The fourth indication The information is used to indicate that the terminal device's switching to the first cell is triggered by service or by signal coverage quality, wherein the second cell is managed by the access network device.
  • the eighth aspect provides a communication device.
  • the device may include a module that performs one-to-one correspondence with the methods/operations/steps/actions described in the fourth aspect.
  • the module may be a hardware circuit, or However, software can also be implemented by hardware circuits combined with software.
  • the device includes: a transceiver unit, configured to receive a second report from the terminal device, the second report being used to indicate that the terminal device fails to switch to the first cell, the second report includes Fourth indication information, the fourth indication information is used to indicate that the terminal equipment switching to the first cell is triggered by service or by signal coverage quality, wherein the second cell is the Cell managed by access network equipment.
  • a processing unit configured to determine, according to the fourth indication information, whether the switching of the terminal equipment to the first cell is triggered by service or by signal coverage quality.
  • a communication device including a processor.
  • the processor can implement the method in the above first aspect or the third aspect and any possible implementation manner of the first aspect or the third aspect.
  • the communication device further includes a memory, and the processor is coupled to the memory and can be used to execute instructions in the memory to implement the first aspect or the third aspect and any possibility of the first aspect or the third aspect. Methods in the implementation.
  • the communication device further includes a communication interface, and the processor is coupled to the communication interface.
  • the communication interface may be a transceiver, a pin, a circuit, a bus, a module, or other types of communication interfaces, and is not limited thereto.
  • 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 processor.
  • the processor can implement the method in the above second or fourth aspect and any possible implementation manner of the second or fourth aspect.
  • the communication device further includes a memory, and the processor is coupled to the memory and can be used to execute instructions in the memory to implement the above second aspect or the fourth aspect and any possibility of the second aspect or the fourth aspect. Methods in the implementation.
  • the communication device further includes a communication interface, and the processor is coupled to 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 performs any one of the above-mentioned first to fourth aspects and possible implementations of the first to fourth aspects. method.
  • 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, the receiver, and the signal output by the output circuit may be, for example, but not limited to, output to and transmitted by the transmitter, and the input circuit and the output A circuit may be the same circuit that functions as an input circuit and an output circuit at different times.
  • the embodiments of this application do not limit the specific implementation methods of the processor and various circuits.
  • a computer program product includes: a computer program (which can also be called a code, or an instruction).
  • a computer program which can also be called a code, or an instruction.
  • the computer program When the computer program is run, it causes the computer to execute the above first to fourth aspects. aspect and the method in any possible implementation manner from the first aspect to the fourth aspect.
  • a computer-readable storage medium stores a computer program (which may also be called a code, or an instruction), and when run on a computer, causes the computer to execute the above-mentioned first aspect. to the fourth aspect and the method in any possible implementation manner of the first to fourth aspects.
  • a computer program which may also be called a code, or an instruction
  • a fourteenth aspect provides a communication system, including at least one communication device provided by the fifth aspect and at least one communication device provided by the sixth aspect. And/or, it includes at least one communication device provided by the seventh aspect and at least one communication device provided by the eighth aspect.
  • Figure 1 is a schematic diagram of a communication system provided by an embodiment of the present application.
  • Figure 2 is a schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 3 is a schematic flow chart of the cell redirection process provided by the embodiment of the present application.
  • Figure 4 is a schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 5 is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 6 is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 7 is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 7A is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 7B is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • Figure 8 is a schematic block diagram of a communication device provided by an embodiment of the present application.
  • Figure 9 is a schematic structural diagram of a terminal device provided by an embodiment of the present application.
  • Figure 10 is a schematic structural diagram of a network device provided by an embodiment of the present application.
  • “/" can indicate that the related objects are in an "or” relationship.
  • A/B can indicate A or B;
  • and/or can be used to describe that there are three types of associated objects.
  • a relationship for example, A and/or B, can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural.
  • words such as “first” and “second” may be used to distinguish them. The words “first”, “second” and other words do not limit the quantity and execution order, and the words “first” and “second” do not limit the number and execution order.
  • the technical solutions of the embodiments of this application can be applied to various communication systems, such as: long term evolution (long term evolution, LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (time division duplex) , TDD), universal mobile telecommunication system (UMTS), global interoperability for microwave access (WiMAX) communication system, fifth generation (5th generation, 5G) communication system, and the information provided by this application
  • LTE long term evolution
  • FDD frequency division duplex
  • TDD time division duplex
  • UMTS universal mobile telecommunication system
  • WiMAX global interoperability for microwave access
  • 5G fifth generation
  • the communication method can also be applied to communication systems in the public land mobile communication network (public land mobile network, PLMN) or other communication systems that will evolve in the future. This application does not limit this.
  • FIG. 1 is a schematic diagram of a wireless communication system 100 suitable for an embodiment of the present application.
  • the wireless communication system 100 may include at least access network equipment, such as the access network equipment 110 and the access network equipment 120 shown in Figure 1.
  • the wireless communication system 100 may also include at least one terminal device, such as the terminal device 130 shown in FIG. 1 .
  • One access network device can manage at least one cell.
  • the access network device 110 manages cell 1
  • the access network device 120 manages cell 2.
  • the terminal device can access the cell and communicate with the access network device that manages the cell through the cell.
  • the terminal device 130 enters the coverage of cell 1, it can access the cell.
  • Cell 1 obtains the communication service of the access network device 110 through Cell 1, that is, Cell 1 serves as the serving cell for the terminal device.
  • Cell switching or redirection may occur during the movement of the terminal device. For example, if the terminal device moves to the coverage of cell 2 and the signal quality of cell 2 is good, the terminal device can switch or redirect from cell 1 to cell 2. Disconnect from cell 1 and access cell 2. Or the terminal device can be switched or redirected from cell 1 to cell 2 due to service triggers. For example, the access network equipment 110 and the access network equipment 120 adopt different wireless access technologies, and the terminal equipment may be switched or redirected from cell 1 to cell 2 due to the voice service trigger.
  • the access network device 110 performs information exchange with the access network device 120, instructs the terminal device to switch to cell 2, and provides the terminal device 130 with relevant access to cell 2.
  • Information the terminal device accesses cell 2 according to the instruction of access network device 110, and obtains access network device 120 through cell 2 communication service, that is, cell 2 serves as the serving cell for the terminal equipment, thereby completing the handover from cell 1 to cell 2.
  • cell 1 may be called the source cell for handover of the terminal equipment
  • cell 2 may be called the target cell for handover of the terminal equipment.
  • the terminal device can perform the redirection on the candidate frequency point provided by the access network device 110 Cell selection: After determining cell 2 as the target cell for redirection, access cell 2 and obtain the communication service of the access network device 120 through cell 2, that is, cell 2 serves as the serving cell for the terminal device, thereby completing the redirection from cell 1 Go to Community 2.
  • the terminal equipment in the embodiment of this application may also be called user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal , wireless communications equipment, user agent or user device.
  • the terminal device in the embodiment of the present application can be a mobile phone (mobile phone), a tablet computer (pad), a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal equipment, vehicle-mounted equipment, wearable devices or terminal equipment in future evolved PLMN, etc.
  • the access network node in the embodiment of the present application may be a device with wireless transceiver functions, and may also be called an access network device or a network device.
  • This equipment includes but is not limited to: equipment with some or all base station functions, such as evolved base stations (evolved NodeB, eNodeB), next generation base stations (next generation NodeB, gNB) in the fifth generation (5th generation, 5G) mobile communication system ), the next generation base station in the 6th generation (6G) mobile communication system, the base station in the future mobile communication system, the transmission reception point (TRP), the wireless fidelity (wireless fidelity, WIFI) system Access point (AP), wireless relay node, wireless backhaul node and other equipment.
  • access network nodes may include centralized units (CU) and/or distributed units (DU).
  • CU and DU can respectively implement some functions of the base station.
  • CU is responsible for processing non-real-time protocols and services, implementing radio resource control (RRC), and packet data convergence protocol (PDCP) layer functions.
  • RRC radio resource control
  • PDCP packet data convergence protocol
  • DU is responsible for processing physical layer protocols and real-time services, and implementing the functions of the radio link control (RLC) layer, media access control (MAC) layer and physical (physical, PHY) layer.
  • RLC radio link control
  • MAC media access control
  • PHY physical layer
  • the access network node may also include an active antenna unit (AAU), which can implement some physical layer processing functions, radio frequency processing and active antenna related functions.
  • AAU active antenna unit
  • a cell can be understood as the coverage area of a wireless signal identified by a cell identification code. From the perspective of resource management, a cell is a unit where network equipment manages wireless communication resources.
  • the physical layer resources of the cell include carriers.
  • Carriers are physical resources used to carry wireless signals of access network equipment. Carriers are represented by carrier frequency and Characterized by the bandwidth of the carrier frequency band, the carrier can be called the working carrier of the cell, and the carrier frequency can be called the working frequency of the cell.
  • the terminal device can perform cell selection on the candidate frequency point (or candidate cell frequency point) through frequency scanning. That is, the terminal device detects the synchronization signal of the cell on the candidate frequency point through frequency scanning, and based on the detected synchronization signal Obtain the signal quality of the cell to choose whether to access the cell.
  • the access network equipment connected to the terminal equipment determines the location to be switched by the terminal equipment based on the measurement results. target cell, and conduct information exchange (such as resource request, data forwarding, etc.) with the target access network equipment that manages the target cell to complete handover preparations, and then instruct the terminal device to switch to the target cell through a handover command, until the terminal device successfully accesses After entering the target cell, the target access network device notifies the source access network device to release the resources of the terminal device.
  • the source access network device can configure one or more candidate frequency points for performing cell redirection for the terminal device when the terminal device is in the connected state.
  • the terminal device receives radio resource control (radio resource control) from the source access network device in the source cell. After releasing the message (control, RRC), cell selection is performed on the one or more candidate frequencies.
  • the process of selecting a target cell and accessing the cell is called the cell redirection process of redirecting from the source cell to the target cell.
  • the cell redirection of the terminal device may be triggered based on the signal coverage quality. For example, the network device may determine the coverage of the serving cell and/or the coverage of the neighboring cells of the serving cell based on the measurement results reported by the terminal device, thereby triggering the redirection of the terminal device.
  • the network device determines that the signal quality of the serving cell is poor based on the measurement results reported by the terminal device. For example, the signal quality of the serving cell is lower than the preset threshold value or the signal quality of the serving cell is lower than the signal quality of the adjacent cell, thereby determining that the signal coverage quality of the serving cell is poor. , triggering redirection of the terminal device.
  • the network equipment determines that the signal quality of the neighboring cell is better based on the measurement results reported by the terminal equipment. For example, based on the measurement report, it is determined that the signal quality of the neighboring cell is higher than the quality of the serving cell, the signal quality of the neighboring cell is higher than the preset threshold, etc., and the neighboring cell is determined. The signal quality is better.
  • the cell redirection of the terminal device may be triggered based on the voice service.
  • cell handover means that the target cell for terminal device handover is indicated to the terminal device by the source access network device after interacting with the target access network device.
  • the terminal device is based on the source access network device.
  • the provided relevant information of the target cell is accessed to the target cell.
  • the source access network device provides candidate frequency points for the terminal device, and the target cell for redirection by the terminal device is selected by the terminal device after cell selection on the candidate frequency point.
  • voice service has entered the Internet protocol (IP) era of the fourth generation (4G) mobile communication network and has been replaced by the packet switch (PS) domain.
  • IP Internet protocol
  • PS packet switch
  • the main voice strategies adopted are LTE voice (voice over LTE, VoLTE) and CS fallback (CS fallback) based on the IP multimedia subsystem (IP multimedia subsystem, IMS).
  • LTE voice voice over LTE, VoLTE
  • CS fallback IP multimedia subsystem
  • IMS IP multimedia subsystem
  • the access network equipment can instruct the terminal equipment to perform cell switching or cell redirection.
  • the terminal equipment connects to the access network equipment in the 4G network by performing cell switching or cell redirection, thereby completing voice services in the cell of the 4G network.
  • the voice service can be a normal voice service or an emergency voice service.
  • the "service" in this application can be understood as "voice service”.
  • a suitable cell refers to a cell where terminal equipment can camp and obtain normal services.
  • a suitable community should meet the following requirements:
  • the cell is part of the selected PLMN or a registered PLMN or an equivalent PLMN.
  • the cell is not part of the "Tracking areas prohibited from providing roaming"list;
  • An acceptable cell refers to a cell where terminal equipment can camp and obtain limited services. Acceptable communities should meet the following requirements:
  • the above acceptable cell requirements are the minimum requirements required to initiate an emergency call and receive earthquake and tsunami warning system (ETWS) and commercial mobile alert system (CMAS) notifications in the NR network.
  • EWS earthquake and tsunami warning system
  • CMAS commercial mobile alert system
  • Figure 2 is a schematic flow chart of the communication method 200 provided by the embodiment of the present application.
  • the terminal device is redirected from the source cell to the target cell.
  • the source cell is managed by the source access network equipment
  • the target cell is managed by the target access network equipment.
  • the source cell of cell redirection is the serving cell before the terminal device performs cell redirection
  • the target cell is the cell where the terminal device accesses the network through cell redirection, that is, the cell redirection is performed.
  • the final service area is the target cell where the terminal device accesses the network through cell redirection, that is, the cell redirection is performed.
  • the cell redirection of the terminal device is triggered by the voice service.
  • the serving cell of the terminal device is an NR cell.
  • the 5G network where the NR cell is located does not support the VoNR policy and cannot provide voice business services to the terminal device.
  • the source access network device instructs the terminal device to fall back to the cell in the 4G network through cell redirection to complete the transmission of voice service data.
  • the source access network device may send an RRC release message to the terminal device, and instruct the terminal device to perform cell redirection through the RRC release message.
  • the RRC release message also indicates one or more candidate frequency points for the terminal device to perform cell redirection.
  • the candidate frequency points indicated by the RRC release message are the evolved universal mobile telecommunications system (UMTS) of the 4G network.
  • UMTS evolved universal mobile telecommunications system
  • E-UTRA is the access network technology in the 4G network.
  • the E-UTRA frequency point is the wireless access frequency point of 4G, that is, the working frequency point of the cell in the 4G network.
  • the cell in the 4G network can be called E-UTRA.
  • UTRA cell is a cell using E-UTRA technology.
  • the terminal equipment performs cell selection on the E-UTRA candidate frequency point in order to access the 4G network through the cell in the 4G network for voice service data transmission.
  • the network where the source cell is located supports VoNR, but the voice service quality of the terminal device in the cell that supports VoNR does not meet the service requirements.
  • the source access network device can instruct the terminal device to perform cell redirection. This application does not limit this.
  • cell redirection of the terminal device is triggered by signal coverage quality.
  • the terminal device can measure the signal quality of a nearby cell (which may be called a neighboring cell) and send a measurement report to the source access network device to notify the source access network device of the signal quality of the neighboring cell. measurement results.
  • the source access network device may determine that the signal coverage quality of the source cell is poor or the signal coverage quality of the neighboring cell is good based on the measurement results, thereby instructing the terminal device to perform cell redirection.
  • the source access network device may instruct the terminal device to perform cell redirection through an RRC release message.
  • the RRC release message also indicates one or more candidate frequency points for the terminal device to perform cell redirection.
  • the one or more candidate frequency points may be called redirection frequency points.
  • the candidate frequency points may include frequency points of neighboring cells whose signal quality is higher than that of the source cell.
  • the terminal equipment performs cell selection at the candidate frequency point in order to re-access a cell.
  • the measurement result that triggers cell redirection may be the signal quality of the source cell measured by the terminal equipment.
  • the signal quality of the source cell does not meet the quality of service requirements, or the signal quality of the neighboring cell of the source cell.
  • the source access network equipment can instruct the terminal equipment to perform cell Redirect.
  • the cell redirection process in which a terminal device is redirected from a source cell to a target cell can be shown in Figure 3 .
  • the source access network device sends an RRC release message to the terminal device in S301.
  • the RRC release message is used to indicate that the RRC connection between the terminal device and the network is released, and also instructs the terminal device to perform cell redirection.
  • the RRC release message may include information about candidate frequencies for the terminal device to perform cell redirection, and the terminal device selects the redirected cell on the candidate frequency points indicated by the source access network device.
  • the terminal device After the terminal device determines the target cell, it sends a random access preamble to the target access network device in S302.
  • the target access network device After receiving the random access preamble, the target access network device sends a random access preamble to the terminal device in S303. Input the response message, realizing communication between the terminal equipment and the target access network equipment in the target cell.
  • the terminal device continues to send the RRC connection request message to the target access network device in S304 to request to establish a radio resource control connection with the network.
  • the target access network device determines whether to allow the terminal device to access the network based on the RRC connection request message. If the terminal device is allowed to access the network, the target access network device sends an RRC connection establishment message to the terminal device in S305, and uses the RRC connection establishment message. Configure corresponding RRC resources for the terminal device.
  • the terminal device After completing the resource configuration, the terminal device sends an RRC establishment completion message to the target access network device in S306.
  • the terminal device establishes an RRC connection with the network again, completing the redirection from the source cell to the target cell. Cell redirection process.
  • the terminal device sends a first report, where the first report includes information indicating potential failure when the terminal device performs a redirection process, and includes identification information of the target cell.
  • the first report may be used to indicate cause information for the terminal device to perform cell change.
  • the cause information may indicate that the voice service may be dropped, or the cause may be that the ordinary (normal) voice service may be dropped, or the emergency voice service may be dropped.
  • the terminal device After the terminal device is successfully redirected from the source cell to the target cell, if there is a risk of potential failure in the process of redirecting the terminal device from the source cell to the target cell, the terminal device sends a first report to notify the network that there is a problem in the redirection process of the cell.
  • the risk of potential failure enables the network to optimize network parameters by referring to the first report of the terminal device to improve network performance and reduce the probability of mobility failure events.
  • the first report may be called a redirect success report.
  • the first report may be called a random access report, and the first report is also used to indicate that the reason for the random access of the terminal device and the target cell is triggered by traffic.
  • the first report indicates that the reason for the random access of the terminal device and the target cell is triggered by the service, and the first report also indicates information that there is a potential failure in the terminal device performing the cell redirection process.
  • the first report may be called a connection establishment failure report, and the first report indicates that the terminal device and the third-party access network device (the third-party access network device is the source access network device and the target access network Access network equipment other than the device) connection establishment failed.
  • the terminal device fails to perform cell redirection at the first frequency point among the redirection frequencies. Specifically, the terminal device attempts to establish a connection with a third-party access network device at the first frequency point. For example, the terminal device attempts to access the third-party access network device. A third-party access network device, but connection establishment fails, and the terminal device records a first report indicating that the terminal device fails to establish a connection with the third-party access network device.
  • the first report may also indicate that there is a failure in the cell redirection process performed by the terminal device.
  • the terminal device may send the first report to the target access network device, and/or the terminal device may send the first report to the source access network device.
  • the first report sent by the terminal device to an access network device can be passed to the access network device through other network devices in the network.
  • This application Not limited.
  • the terminal device communicates with the target access network device After the communication connection is established, the user moves to another cell and accesses the third-party access network equipment that manages the other cell.
  • the third-party access network equipment refers to access other than the target access network equipment and the source access network equipment.
  • the terminal equipment may send the first report to the third-party access network equipment, and after receiving the first report, the third-party access network equipment forwards the first report to the target device of the first report, Specifically, but not limited to, the first report may be used to indicate that the target device of the first report is the target access network device and/or the source access network device.
  • the third-party access network device forwards the first report to the target device.
  • the third-party access network device may forward the first report to the target device through the communication interface between the third-party access network device and the target device. , or it may be sent by a third-party access network device to other network devices, and then forwarded to the target device through the relay of one or more network devices, which is not limited in this application.
  • potential failures in the cell redirection process include: although the terminal device successfully performs cell redirection, some parameter values involved in the cell redirection process may be about to meet but have not yet met the conditions for cell redirection failure, thus , the terminal equipment determines that there is a risk of potential failure in the cell relocation process.
  • the terminal device records the first report.
  • the network device sends first indication information to the terminal device, where the first indication information is used to indicate the reporting condition.
  • the RRC message sent by the network device to the terminal device includes the first indication information.
  • the RRC message may be an RRC release message.
  • the reporting conditions include but are not limited to one or more of the following conditions 1 to 4:
  • Condition 1 The running time of the first timer is less than or equal to the first threshold value and greater than or equal to the second threshold value.
  • the running time of the first timer is when the terminal device receives the RRC release from the source access network device. The length of time between the message to the terminal device and the random access preamble sent to the target access network device.
  • the first timer in condition 1 above is used to determine whether the terminal device successfully selects the redirected cell.
  • the terminal device starts the first timer after receiving the RRC release message from the source access network device.
  • the first timer is stopped after the incoming device sends the random access preamble. If the running time of the first timer is greater than the first threshold value, and the terminal device does not select a cell that can access the network, the terminal device considers that the cell redirection has failed, and the terminal device can try to re-establish a connection with the source cell, or enter idle mode. state.
  • the reporting condition of the terminal device recording the first report includes condition 1, if the terminal device successfully selects the target cell for redirection when the running time of the first timer is less than or equal to the first threshold value, but If the running time of the first timer is greater than or equal to the second threshold value, the terminal device may consider that the cell selection time during the cell redirection process is longer, and there is a risk that the terminal device fails to select a cell, resulting in cell redirection failure. Therefore, the terminal device may record the first report to the network to inform the network that there is a potential failure in the cell redirection process of the terminal device. In order to optimize the network parameters of the network.
  • the first report is also used to indicate that the reporting condition that triggers recording of the first report includes the condition 1.
  • the first report may include indication information indicating that the reporting condition that triggers recording of the first report includes the condition 1.
  • the indication information may be the identification information of the condition 1 to notify the network that the recording terminal is triggered by the condition 1.
  • the device sends the first report, so that the network can determine based on the first report that the terminal device may potentially fail if the cell selection takes a long time during the cell redirection process, so as to optimize the network parameters accordingly.
  • the first report is also used to indicate the running time of the first timer.
  • the terminal device informs the network of the running time of the first timer through the first report, so that the network can determine based on the running time of the first timer that the terminal device may have a potential failure if it takes a long time to select a cell during the cell redirection process. situation, so as to optimize network parameters accordingly.
  • the first report may both indicate reporting condition 1 and indicate the running duration of the first timer, so that the network obtains After the report conditions include condition 1 and the running time of the first timer, it is determined that the terminal device may potentially fail if it takes a long time to select a cell during the cell redirection process, so that network parameters can be optimized accordingly.
  • the running time of the second timer is less than or equal to the third threshold value and greater than or equal to the fourth threshold value.
  • the running time of the second timer is when the terminal device receives the RRC release from the source access network device. Message to the length of time between the terminal device receiving the RRC connection establishment message from the target access network device.
  • the second timer in the above condition 2 is used to determine whether the terminal device is successfully redirected to the target cell.
  • the terminal device will start the second timer after receiving the RRC release message from the source access network device, and stop the second timer after receiving the RRC connection establishment message from the target access network device. If the running time of the second timer is greater than the third threshold and the terminal device has not received the RRC connection establishment message, the terminal device considers that the cell redirection to the target cell has failed, and the terminal device can select another cell to access the network.
  • the reporting condition of the terminal device recording the first report may include condition 2, if the terminal device successfully redirects to the target cell when the running time of the second timer is less than or equal to the third threshold, but the If the running time of the second timer is greater than or equal to the fourth threshold value, the terminal device may consider that the time required for cell redirection to the target cell is relatively long, and there is a risk of potential failure in the cell redirection process to the target cell. Therefore, the terminal device can record the first report and send the first report to the network to notify the network that there is a potential failure in the cell redirection process of the terminal device. In order to optimize the network parameters of the network.
  • the first report is also used to indicate that the reporting condition that triggers recording of the first report includes the condition 2 and/or the running time of the second timer.
  • the reporting condition that triggers recording of the first report includes the condition 2 and/or the running time of the second timer.
  • the running time of the third timer is less than or equal to the fifth threshold and greater than or equal to the sixth threshold.
  • the running time of the third timer is when the terminal device sends an RRC connection request message to the target access network device. The time period until the terminal device receives the RRC connection establishment message from the target access network device.
  • the third timer in condition 3 above is used to determine whether the RRC connection between the terminal equipment and the network in the target cell is successfully established.
  • the terminal device starts the third timer after sending the RRC connection request message to the target access network device, and stops the third timer after receiving the RRC connection establishment message from the target access network device. If the third timer The running time is longer than the fifth threshold and the terminal device has not received the RRC connection establishment message from the target access network device.
  • the terminal device considers that the RRC connection establishment failed, and the terminal device enters the idle state, or the terminal device attempts to reconnect with the source cell. establish connection.
  • the reporting conditions for the terminal device to record the first report may include condition 3. If the terminal device is less than or equal to the fifth threshold when the running time of the third timer is less than or equal to the fifth threshold, the RRC connection between the terminal device and the network in the target cell is successfully established. , but the running time of the third timer is greater than or equal to the sixth threshold value, the terminal device may consider that it takes a long time to establish the RRC connection in the target cell, and there is a risk that the cell redirection process of redirecting to the target cell may fail. Therefore, the terminal device can record the first report and send the first report to the network to notify the network that there is a potential failure in the cell redirection process of the terminal device. In order to optimize the network parameters of the network.
  • the first report is also used to indicate that the reporting condition that triggers recording of the first report includes the condition 3 and/or the running duration of the third timer.
  • the reporting condition that triggers recording of the first report includes the condition 3 and/or the running duration of the third timer.
  • One or more of the above-mentioned first threshold value, second threshold value, third threshold value, fourth threshold value, fifth threshold value and sixth threshold value may be predefined by the protocol, Or it can be configured by the source access network device for the terminal device. For example, the source access network device may notify the terminal device of the above-mentioned second threshold value, fourth threshold value and sixth threshold value through an RRC release message. One or more of the threshold values.
  • the source access network device can directly indicate the value of the threshold value of the timer, or can predefine multiple candidate values for a threshold value and the identification information of each candidate value.
  • the source access network device can indicate a The identification information of the candidate value notifies the terminal device that the value of the timer is the candidate value corresponding to the identification information.
  • the four candidate values for the threshold value of the timer and the identification information of each candidate value can be defined through protocol predefinition or preconfiguration by the network device.
  • the four candidate values The values are T0, T1, T2, and T3 respectively.
  • the unit of the candidate value can be microseconds, milliseconds, or seconds.
  • the identification information of T0 is 0, the identification information of T1 is 1, the identification information of T2 is 2, and the identification information of T3 is The identification information is 3.
  • the source access network device may use an RRC message.
  • the RRC message may be an RRC release message.
  • the RRC release message may include a 2-bit indication, which is used to indicate one of the four candidate values. Identification information, for example, if the indication indicates that the identification information is 2, then after receiving the RRC release message, the terminal device can determine that the threshold value of the timer is the candidate value T2 corresponding to the identification information 2.
  • the source access network device may indicate one or more of the following first coefficients, second coefficients or third coefficients to notify the terminal device of the value of the corresponding threshold value.
  • the second threshold value is the product of the first threshold value and the first coefficient
  • the fourth threshold value is the product of the third threshold value and the second coefficient
  • the sixth threshold value is a product of the fifth threshold value and a third coefficient, wherein the first coefficient, the second coefficient and the third coefficient are less than 1.
  • the first threshold, the third threshold and the fifth threshold may be notified by the source access network device to the terminal device. If the reporting condition includes condition 1, the source access network device may notify the terminal device of the first coefficient. , the terminal device determines the value of the second threshold based on the first threshold and the first coefficient. Similarly, if the reporting condition includes condition 2, the source access network device may notify the terminal device of the second coefficient. If the reporting condition includes condition 3, the source access network device can notify the terminal device of the third coefficient.
  • the coefficient corresponding to the above threshold value may be a percentage. If the reporting condition includes condition 1, then the RRC message sent by the source access network device to the terminal device, for example, the RRC message may be an RRC release message.
  • the RRC release message indicates that the value of the first coefficient is 90%, then the terminal device can determine the second threshold value based on the first coefficient and the first threshold value according to the value of the first coefficient in the RRC release message, that is, the second The threshold value is 90% of the first threshold value.
  • the source access network device may notify the terminal device of the coefficients corresponding to the fourth threshold value and the sixth threshold value in a similar manner.
  • the application is not limited thereto, and the coefficients may be expressed as decimals or fractions.
  • the terminal device fails to perform cell redirection at the first frequency point, and successfully performs cell redirection at a frequency point other than the first frequency point.
  • the first frequency point is the cell configured by the source access network device for the terminal device.
  • the candidate frequency point for redirection, the frequency point of the target cell is a frequency point other than the first frequency point.
  • the reporting conditions for the terminal device to record the first report may include the above condition 4.
  • the terminal device fails to perform cell redirection at the candidate frequency point configured by the source access network device for the terminal device, and succeeds in cell redirection at a frequency point other than the first frequency point. , then the terminal device needs to record the first report, and the terminal device can send the first report to the network to notify the network that there is a risk of potential failure in the cell redirection process of the terminal device.
  • both the first frequency point and the frequency point of the target cell are candidate frequency points configured by the source access network device for the terminal device to perform cell redirection. That is to say, the source access network device configures multiple candidate frequency points for the terminal device.
  • the multiple candidate frequency points include the first frequency point and the frequency point of the target cell.
  • the terminal device performs cell redirection on the first frequency point. After failure, cell redirection is performed on another candidate frequency point (that is, the frequency point of the target cell) and successfully redirected to the target cell.
  • the first frequency point is a candidate frequency point configured by the source access network device for the terminal device to perform cell redirection.
  • the frequency point of the target cell may be a frequency point other than the candidate frequency point configured by the source access network device for the terminal device. That is to say, the source access network device configures candidate frequency points for the terminal device, including the first frequency point, but does not include the frequency point of the target cell. After the terminal device fails to perform cell redirection on the candidate frequency point, it performs cell redirection on a frequency point other than the candidate frequency point and successfully redirects to the target cell.
  • the first report is also used to indicate that the reporting condition that triggers the first report includes the condition 4 and/or the first frequency point.
  • the first report may include indication information indicating that the reporting condition includes condition 4, notifying the network terminal device that a cell redirection failure has occurred on a candidate frequency point configured by the network, so that the network can optimize network parameters.
  • the first report may include indication information indicating that the reporting condition includes a first frequency point, so as to notify the network of the first frequency point at which the terminal equipment fails to perform cell redirection, so that the network can obtain the specific terminal equipment cell redirection failure.
  • Frequency information can be used to optimize network parameters in a targeted manner.
  • the first report is also used to indicate one or more of the following:
  • Identification information of the source cell Identification information of the source cell, identification information of the target cell, cell measurement information, redirection frequency point information, frequency point of the target cell, indication information indicating whether there is a suitable cell, indication information indicating whether there is an acceptable cell , the running time of the first timer, the running time of the second timer, the running time of the third timer, or the running time of the fourth timer.
  • the cell measurement information includes one or more of the measurement information of the source cell, the measurement information of the target cell, the measurement information of neighboring cells of the source cell, or the measurement information of neighboring cells of the target cell.
  • the cell measurement information may be the measurement result of the cell.
  • the cell measurement information also includes measurement information of other cells except the source cell and the target cell.
  • the terminal device performs cell signal quality measurement on the candidate frequency point, and the cell measurement information may include the measurement results of the cell measured by the terminal device.
  • the cell measurement information may include the measurement results of the terminal equipment measuring the cell at the first frequency point.
  • the running time of the fourth timer is the time between the terminal device receiving the RRC release message from the source access network device and the terminal device successfully establishing a service channel with the target access network device, or the terminal device receiving the RRC release message from the source access network device.
  • the terminal device starts the fourth timer after receiving the RRC release message from the source access network device.
  • the terminal device is redirected from the source cell to the target cell. After the terminal device and the target access network device successfully establish a service channel, or the terminal After the device and the target access network device successfully transmit the service data packet, the terminal device stops the fourth timer, and the running time of the fourth timer can be called the service interruption time.
  • the source access network device uses an RRC release message to instruct the terminal device to fall back to a cell in the 4G network through cell redirection to complete voice service data transmission.
  • the terminal device After receiving the RRC release message, the terminal device starts the fourth timer and performs cell redirection.
  • the terminal device is successfully redirected to the target cell.
  • the target cell is a cell managed by an eNodeB in the 4G network, that is, the target access network.
  • the device is the eNodeB in the 4G network.
  • the terminal device initiates a tracking area update (TAU) process to the eNodeB.
  • the tracking area refers to the location update and tracking area of the terminal device in the LTE network.
  • the LTE network coverage area is divided into multiple tracking areas.
  • the basic unit of paging After the terminal equipment and eNodeB complete the TAU process, the terminal equipment establishes a VoLTE service channel with the eNodeB. After the VoLTE service channel is successfully established, the terminal equipment stops the fourth timer.
  • the running time of the fourth timer is the voice service interruption time.
  • the terminal The first report sent by the device may include the fourth timing The running time of the server. This allows the network to obtain the interruption duration of voice services during cell redirection of specific terminal equipment, and optimize network parameters in a targeted manner.
  • the terminal device sends the first report, including: the terminal device sends the first report to the source access network device, the first report includes the identification information of the source cell, or the terminal device sends the first report to the target access network device. Report.
  • the source access network device or the target access network device can receive the first report through other network devices. That is to say, the terminal device sends the first report to other network devices, and then the terminal device sends the first report to other network devices. Other network devices forward it to the source access network device or the target access network device.
  • the source access network device or the target access network device may also send the received first report to other network devices. It can be understood that for the source access network device, the target access network device belongs to the above-mentioned other network devices; for the target access network device, the source access network device belongs to the above-mentioned other network devices.
  • Figure 4 is a schematic flow chart of the communication method 400 provided by the embodiment of the present application.
  • the terminal device sends a first report to the target access network device, the target access network device forwards the first report to the source access network device, and the source access network device adjusts network configuration parameters according to the first report. .
  • the terminal device sends the first report to the target access network device.
  • the target access network device receives the first report from the terminal device.
  • the first report is a report sent by the terminal device to the source access network device. Since the access network device currently connected to the terminal device is the target access network device, the terminal device can pass the target access network device.
  • the access network device forwards the first report to the source access network device.
  • the target access network device encapsulates the first report in a container and sends it to the source access network device.
  • the first report includes identification information of the source cell, and the identification information of the source cell is used to indicate that the first report is a report sent to the access network equipment of the source cell (ie, the source access network equipment).
  • the target access network device may determine that the first report is a report sent to the source access network device based on the identification information of the source cell in the first report.
  • the terminal device records the first report and sends the first report to the source access network device so that the source access network device can refer to the first report to determine whether to optimize the candidate frequency point. , reducing the probability of cell redirection failure for terminal equipment in the network.
  • the first report includes identification information of the source cell.
  • the target access network device may determine that the first report is a report sent to the source access network device based on the identification information of the source cell in the first report.
  • the target access network device transparently transmits the first report to the source access network device. That is, after the target access device determines that the target device of the first report is the source access network device, it does not parse the content of the first report and replaces the first report with the source access network device. The first report is forwarded to the source access network device.
  • the terminal device determines that the first report is the first report sent to the source access network device based on the reporting condition that triggers the terminal device to record the first report.
  • the application is not limited to this, and the terminal device may not make this determination.
  • the terminal device records the first report and sends the first report to the source access network device.
  • the source access network device analyzes the reasons for potential failure risks in the cell redirection process of the terminal device (can Refer to the relevant description in S403).
  • the target access network device sends the first report to the source access device.
  • the source access network device receives the first report from the target access network device.
  • S403 The source access network device adjusts network configuration parameters according to the first report.
  • the source access network device can determine that the terminal device successfully performs cell redirection from the source cell, but there is In case of potential failure, the source access network device may adjust the network parameter configuration based on the first report.
  • the source cell performs cell redirection to multiple terminal devices of other cells.
  • the terminal device records the first report and sends it to the source access network device.
  • the source access network device may optimize network parameters based on the first reports of multiple terminal devices, in order to reduce the probability of redirection failure. For example, the source access network device optimizes the candidate frequency point configuration based on first reports from multiple terminal devices.
  • the first report sent by multiple terminal devices includes the frequency point information of the cell that the corresponding terminal device successfully accessed by performing cell redirection from the source cell.
  • the source access network device can refer to the first report from the multiple terminal devices.
  • the indicated terminal device successfully completes the frequency point of cell redirection, and configures the candidate frequency point for the terminal device in the source cell to perform cell redirection, but the application is not limited to this.
  • the source access network device may also adjust other network parameter configurations based on other information in the first report.
  • the terminal device does not determine that there is a potential cause of failure in the cell redirection process.
  • the terminal device records the first report and sends it to the source access network device.
  • the first report is that the source access network equipment analyzes the cause of potential failure in the cell redirection process of the terminal equipment. If the source access network device analyzes that the cause of potential failure in the cell redirection process of the terminal device is caused by unreasonable parameter configuration of the source access network device, the source access network device can refer to the first report to optimize network parameters. .
  • the source access network device may notify the target access network device.
  • the terminal device determines that there is a potential risk of failure in the cell redirection process
  • the terminal device sends a first report to the source access network device that instructs the terminal device to perform cell redirection.
  • the first report may not include
  • the source access network device configures cell redirection-related information (such as candidate frequency point information, etc.) for the terminal device, based on the first report and combined with the cell redirection-related configuration previously provided for the terminal device. Information and analysis of the reasons for potential failure risks can improve the accuracy of network optimization while reducing the information overhead of the first report.
  • the source access network device sends a first message to the target access network device, where the first message includes information related to the target access network device in the first report.
  • the source access network device After receiving the first report, the source access network device analyzes the information in the first report and determines that the potential failure risk problem in the cell redirection process of the terminal device is related to the target access network device, then the source access network device The device forwards the information related to the target access network device in the first report to the target access network device.
  • the first report indicates that the cell redirection process of the terminal equipment satisfies reporting conditions 1 and 2, indicating that although the terminal equipment was successfully redirected to the target cell, the terminal equipment received the RRC release message from the source access network equipment to the target cell.
  • the time between the target access network device sending the random access preamble is long (that is, the running time of the first timer is less than or equal to the first threshold value and greater than or equal to the second threshold value), and the terminal device receives
  • the time between receiving the RRC release message from the source access network device and receiving the RRC connection establishment message from the target access network device is longer (that is, the running time of the second timer is less than or equal to the third threshold value, and Greater than or equal to the fourth threshold value)
  • there is a risk of potential failure in the cell redirection process The cell redirection process of the source access network equipment based on the terminal equipment satisfies both reporting condition 1 and reporting condition 2.
  • the reason for judging the potential risk of failure in the cell redirection process may be related to both the configuration of the source access network and the target access. It is related to the configuration of network equipment.
  • the risk of potential failure in the cell redirection process may be related to the resource configuration (such as preamble, time-frequency resources, etc.) of the random access process of the target cell.
  • the source access network device sends the first message to the target access network device.
  • the first message may indicate that the cell redirection process of the terminal device satisfies reporting condition 1 and condition 2.
  • the first message also includes other information in the first report, such as the first timer. and/or the running time of the second timer, so that the target access network device can refer to the first message to optimize network parameters.
  • the source access network device analyzes the first report and determines that the risk of potential failure in the cell redirection process of the terminal device has nothing to do with the target access network device, the source access network device may not connect to the target.
  • the network access device sends the first message.
  • Figure 5 is a schematic flow chart of the communication method 500 provided by the embodiment of the present application.
  • the terminal device sends the first report to the target access network device.
  • the target access network device receives the first report from the terminal device.
  • the first report is a report sent by the terminal device to the target access network device, that is, the target device of the first report is the target access network device.
  • the terminal device sends the first report to the target access network device.
  • the terminal device establishes a wireless communication connection with the target access network device
  • the terminal device sends the first report
  • the target access network device receives the first report in the wireless channel.
  • the terminal device sending the first report to the target access network device may mean that the terminal device has moved from the target cell to another cell, and the terminal device sends the first report to the third-party access network device that establishes the communication connection.
  • the third-party access network equipment forwards the first report to the target access network equipment. This application is not limited.
  • the terminal device when the reporting condition includes condition 3 above, and the process of cell redirection performed by the terminal device satisfies reporting condition 3, the terminal may be damaged due to unreasonable network access configuration of the target cell (such as unreasonable random access channel parameter configuration, etc.) If there is a risk of potential failure in the cell redirection process of redirecting the device to the target cell, the terminal device records the first report and can send the first report to the target access network device so that the target access network device can refer to the first report. , determine whether to optimize network configuration parameters and reduce the probability of cell redirection failure for terminal equipment in the network.
  • the target access network device adjusts network configuration parameters according to the first report.
  • the target access network device may determine that the terminal device successfully performs cell redirection to the target cell, but there is a potential failure, and the target access network device may adjust network configuration parameters based on the first report.
  • the terminal device records the first report and sends the first report to the target access network device, and the target access network device collects the first report , if the target access network device receives a certain number (such as a preset number) of terminal devices sending first reports indicating that there is a risk of potential failure in the cell redirection process, the target access network device can adjust the network access parameter configuration, Such as random access channel (random access channel, RACH) and other configurations.
  • RACH random access channel
  • the first report may be sent to both the target access network device and the source access network device.
  • the target access network device may not only optimize the network parameters by referring to the first report, but also forward the first report to the source access network device.
  • the source access network device may receive the first report, or may Refer to the first report to optimize network parameters.
  • the target access network device may send the information in the first report used by the source network device to optimize network parameters to the source access network device.
  • the terminal device determines whether the first report is sent to the source access network device or the target access network device or the source access network device and the target access network device based on the reporting condition that triggers the terminal device to record the first report.
  • This first report is required.
  • the terminal device may not make this judgment.
  • the terminal device records the first report and sends the first report to the target access network device.
  • the first report includes the identification information of the source cell, as shown in
  • the target access network device determines whether it needs to transfer the first report or part of the information in the first report based on the first report. Send it to the source access network device so that the source access network device can optimize network parameters.
  • the first report includes information indicating that the reporting conditions include condition 1 and condition 3, as well as the running time of the first timer, the running time of the third timer, cell measurement information, the frequency point of the target cell, and the target
  • the access network device receives the first report, based on the report conditions including condition 3, it can be determined that there may be an unreasonable parameter configuration of the target access network.
  • You can refer to the first report (such as the running time of the third timer, The measurement results of the target cell in the cell measurement information, etc.) are used to configure network parameters.
  • the target access network device determines that the parameters of the source access network may be unreasonably configured based on the reporting conditions.
  • the target access network device can send an interface message to the source access network device to indicate a potential failure in the cell redirection process of the terminal device.
  • the interface message may include the running time of the first timer, cell measurement information, and frequency point information of the target cell, so that the source access network device can refer to the interface message to determine whether to optimize network parameters.
  • the first report also includes second indication information, the second indication information is used to indicate that the cell redirection is triggered by traffic or triggered by measurement results.
  • the cell redirection may be triggered by voice traffic.
  • the source access network device can instruct the terminal device to perform cell redirection. If the terminal device records the first report because the reporting conditions are met, the first report includes the second indication information, and the second indication information indicates that the cell redirection is triggered by the voice service. Alternatively, the source access network device instructs the terminal device to perform cell redirection based on the cell measurement result reported by the terminal device. If the terminal device sends the first report, the second instruction information in the first report indicates that the cell redirection is the cell redirection. Triggered by measurement results.
  • the network device that obtains the first report can determine the cause that triggers the terminal device to perform cell redirection. For example, when cell redirection is triggered by voice services, the network device may determine based on the second indication information that it is not caused by a decrease in the signal quality of the serving cell or that the signal quality of the neighboring cell is higher than the service signal quality of the serving cell. The network device may not refer to the first report for adjustment. Measuring configuration-related network parameters and adjusting only cell redirection configuration-related parameters can improve the accuracy of network parameter optimization and reduce unnecessary or erroneous network parameter optimization.
  • the above has exemplarily introduced the application's proposal that when there is a risk of potential failure in the redirection process of the terminal device from the source cell to the target cell, the terminal device can send a first report to the network device to notify the network device terminal.
  • the network device can refer to the first report to optimize network parameters and improve the performance of the network device's mobility management of the terminal device.
  • the handover failure report of the terminal device can also be used as a reference for network equipment to optimize network parameters.
  • the cell handover performed by the terminal equipment may be triggered by signal coverage quality or service data, cell handover failures for different triggering reasons may cause the network equipment to perform network optimization in different directions.
  • the embodiment of this application proposes that when the terminal device notifies the network device that cell switching fails, it needs to notify the network device of the reason for triggering the terminal device to perform cell switching, so that the network device can perform network parameter optimization more accurately. The following is explained in conjunction with Figure 6.
  • Figure 6 is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • S601 The terminal device fails to switch to the first cell.
  • the terminal device receives a handover command in the source cell, and the handover command is used to instruct the terminal device to switch to the first cell.
  • the terminal equipment performs cell switching, but the terminal equipment fails to switch to the first cell successfully.
  • the terminal device attempts to establish communication connections with other cells.
  • S602 The terminal device establishes a communication connection with the second cell.
  • the RAT of the second cell is the same as that of the first cell.
  • the terminal device performs cell handover of a different-standard network (or different system) from the source cell, and the source access network device instructs the terminal device to switch to a first cell with a different RAT from the source cell.
  • the source cell is a cell in the 5G network and uses NR access technology
  • the first cell is a cell in the 4G network and uses E-UTRA technology, and vice versa
  • this application does not limit this.
  • the terminal device fails to switch to the first cell, the terminal device continues to perform cell selection on the candidate frequency point of the network where the first cell is located to access other cells with the same RAT as the first cell.
  • the candidate frequency points in each network may be predefined by the protocol.
  • the candidate frequency points of the cells in the 4G network and the candidate frequency points of the cells in the 5G network are all predefined by the protocol. If the terminal device successfully selects a suitable cell (such as a cell that meets signal quality requirements), that is, the terminal device successfully selects a second cell with the same RAT as the first cell, the terminal device manages access to the second cell in the second cell. Network equipment establishes communication connections. Therefore, the RAT of the second cell is the same as that of the first cell.
  • the RAT of the second cell is different from that of the first cell.
  • the source access network device instructs the terminal device to switch to a first cell with a different RAT from the source cell. If the terminal device fails to switch to the first cell, the terminal device continues to perform cell selection on the frequency point of the network where the first cell is located, but the terminal device does not select a suitable cell with the same RAT as the first cell. The terminal device re-establishes a connection with the source cell.
  • the second cell is the source cell of the terminal device, and the RAT of the second cell is different from that of the first cell.
  • the application is not limited to this, and the second cell may also be another cell with a different RAT from the first cell.
  • the terminal device sends a second report to the first access network device that manages the second cell.
  • the second report is used to indicate that the terminal device fails to switch to the first cell.
  • the second report includes fourth indication information.
  • the fourth indication The information is used to indicate whether the switching of the terminal equipment to the first cell is triggered by the voice service or by the measurement result.
  • the first access network device receives the second report from the terminal device, and determines the triggering reason for triggering the terminal device to switch to the first cell according to the fourth indication information in the second report.
  • the second report is an RLF report or a connection establishment failure report.
  • the first access network device may determine that it may be due to the unreasonable configuration of the source cell's measurement parameters and/or the measurement-based handover parameters.
  • the handover failure may be caused by unreasonable configuration of parameters such as the threshold value of the measurement report of the source cell, but the application is not limited to this.
  • the first access network device may send a second message to the source access network device.
  • the second message is used to instruct the terminal device to switch from the source cell to the first cell.
  • the second message may include the second report or the second report. Based on part of the information in the message, the source access network device can refer to the second message to perform network parameter optimization.
  • network parameter optimization includes but is not limited to adjusting measurement configuration parameters and/or measurement-based handover parameters.
  • the failure of the terminal device to switch to the first cell may also be caused by unreasonable network parameter configuration of the first cell, such as parameters related to the random access process.
  • the first access network device may send the second report or part of the information in the second report to the access network device that manages the first cell, so that the access network device that manages the first cell can use it as reference information for network parameter optimization.
  • the fourth indication information indicates that the terminal device's handover to the first cell is triggered by the voice service
  • the first access network device may determine that the voice service triggers the terminal device's handover to the first cell, rather than signal coverage quality. , therefore the first access network device can determine that the failure of the terminal device to handover to the first cell is not caused by unreasonable configuration of the measurement parameters of the source cell and/or the measurement-based handover parameters.
  • the first access network device may not send the second report to the source access network device.
  • the first access network device sends the second report or part of the information in the second report to the access network device that manages the first cell.
  • the second report also includes fifth indication information, the fifth indication information is used to indicate whether the terminal device selects Select a cell that meets the conditions, or indicate whether a suitable cell is selected.
  • the terminal equipment does not select the same cell as the RAT of the first cell, and the terminal equipment re-establishes a connection with the source cell, that is, the second cell is the source cell before the terminal equipment performs cell switching.
  • the second report includes fifth indication information,
  • the fifth indication information indicates that a cell that satisfies the condition is not selected, so as to notify the network terminal device that a cell that is the same as the first cell RAT is not selected. It can provide the network with detailed information related to the cell handover process, provide a reference for network equipment when optimizing network parameters, and improve the effectiveness of network equipment in mobility management of terminal equipment.
  • the fifth indication information can be recorded as noSuitableCellFound. When noSuitableCellFound is "True", it means that the terminal device has not selected a cell that meets the appropriate cell conditions.
  • the terminal equipment after the terminal equipment fails to switch to the first cell, it selects a cell with the same RAT as the first cell, that is, the second cell.
  • the second report includes fifth indication information, and the fifth indication information indicates that the cell that meets the conditions is selected.
  • the terminal device after the terminal device fails to switch to a cell, when a communication connection is established with the network again, the terminal device sends a second report to the connected access network device.
  • the second report includes a triggering reason indicating the triggering of the cell switch. Indication information so that the network can more accurately adjust unreasonable parameter configurations based on handover triggering reasons and reduce unnecessary or erroneous network parameter adjustments, thereby improving the effectiveness of network equipment's mobility management of terminal equipment.
  • the network device instructs the terminal device to switch to a cell (such as the first cell) of the heterogeneous network due to the voice service of the terminal device, based on the current handover mechanism, if the terminal device fails to perform cell handover, the terminal device will switch to the first cell in the first cell.
  • Cell selection is performed on the candidate frequency points of the standard network, and a cell that meets the conditions is selected for access. If it is an ordinary voice service, the satisfied conditions refer to the conditions of a suitable cell; if it is an emergency voice service, the satisfied conditions refer to the conditions of a suitable cell and an acceptable cell.
  • the terminal device first selects a suitable cell. If no suitable cell is selected, Choose an acceptable neighborhood.
  • the embodiment of this application proposes that if the terminal device performs cell handover due to voice service trigger but the handover fails, and the cell selection fails to select a cell that meets the conditions, the terminal device can re-establish a connection with the access network device of the source cell. The following is explained in conjunction with Figure 7.
  • Figure 7 is another schematic flow chart of the communication method provided by the embodiment of the present application.
  • the second access network device sends a switching command to the terminal device.
  • the switching command is used to instruct the voice service to trigger the terminal device to switch to the first cell.
  • the serving cell (that is, the source cell) of the terminal device is an NR cell.
  • the 5G network where the NR cell is located does not support the VoNR policy and cannot provide voice business services to the terminal device.
  • the second access network device that manages the source cell sends a switching command to the terminal device.
  • the switching command indicates that the voice service triggers the terminal device to switch to the 4G network.
  • the terminal device After receiving the handover command, the terminal device performs a cell handover process to the first cell.
  • the RAT of the first cell is different from that of the source cell.
  • S702 The terminal device fails to switch to the first cell.
  • the first cell is a cell managed by the third access network device.
  • the terminal device performs a random access process to the first cell and attempts to switch to the first cell, but the terminal device fails to switch to the first cell.
  • S703 The terminal device performs cell selection, but no cell that meets the conditions is selected.
  • the terminal device After the terminal device fails to perform cell handover to the first cell, the terminal device performs cell selection to access a cell with the same RAT as the first cell, but the terminal device does not select a cell that meets the conditions.
  • the satisfied conditions refer to the conditions of a suitable cell; if it is an emergency voice service, the satisfied conditions refer to the conditions of a suitable cell and an acceptable cell.
  • the terminal device first tries to select a suitable cell. If no suitable cell is selected, the terminal device can select an acceptable cell.
  • the terminal equipment selects a cell that meets the conditions at the E-UTRA frequency point where the first cell is located or at other E-UTRA frequency points to access the cell with the same RAT as the first cell. For example, the terminal equipment detects synchronization signals on one or more E-UTRA frequency points and performs signal quality measurement when a synchronization signal of a cell is detected. If the measurement results of the cell meet the access conditions, the terminal equipment performs signal quality measurement on the cell. The cell performs a random access process.
  • the terminal device executes S704.
  • the terminal device can be predefined by the protocol or preconfigured by the network. After the terminal device fails to handover to the target cell, it can perform cell selection on the candidate frequency point where the cell with the same RAT as the target cell is located. If the terminal device fails to handover to the first cell, If a cell that satisfies the conditions is not selected within the preset time period, the terminal device determines that a cell that satisfies the conditions is not selected, or if the terminal device does not select a cell that satisfies the conditions on the candidate frequency point where the cell with the same RAT of the target cell is located. , the terminal device executes S704.
  • S704 The terminal device and the source cell perform an RRC reestablishment process.
  • the terminal equipment switches to the first cell triggered by the voice service, rather than the coverage indicating that the signal quality of the source cell has declined or the signal quality of the first cell is higher than the signal quality of the source cell.
  • the signal quality of the source cell still meets the communication requirements. , so the terminal device can re-establish the RRC connection with the source cell to resume communication with the network.
  • the terminal device sends a third report to the second access network device, where the third report is used to indicate that the terminal device fails to switch to the first cell.
  • the second access network device is a source access network device that manages the source cell.
  • the second access network device receives the third report from the terminal device.
  • the third report may include the fifth indication information in the embodiment shown in FIG. 6, the fifth indication information being used to indicate that the terminal device has not selected a cell that meets the conditions.
  • the fifth indication information may indicate that the terminal device does not select a suitable cell in the normal voice service scenario; or, in an emergency voice service scenario, if the terminal The device does not select a suitable cell and selects an acceptable cell.
  • the fifth indication information can also be used to indicate that the terminal device does not select a suitable cell or an acceptable cell in an emergency voice service fallback scenario.
  • the fifth indication information can be recorded as noSuitableCellFound.
  • noSuitableCellFound is "True" it means that the terminal device has not selected a cell that meets the conditions.
  • the third report may also include the fourth indication information in the embodiment shown in FIG. 6, where the fourth indication information is used to indicate that the cell switching is triggered by the voice service.
  • the second access network device can determine based on the fifth indication information and the fourth indication information that the terminal equipment triggers cell switching due to the voice service, causing the terminal equipment to stay in the E-UTRA frequency point (i.e., the LTE frequency point) for a long time. No cell that meets the conditions is selected under click), so that the second access network device can refer to the third report to optimize network parameters and adjust network configuration parameters.
  • the third report may not include the fourth indication information, because the cell switching of the terminal device is instructed by the second access network device (ie, the source access network device). Therefore, the second access network device After the terminal equipment reconnects to the source cell, it can be determined based on the identification information of the terminal equipment that the cell switching of the terminal equipment was triggered by the voice service, and the basic When the third report determines that the terminal device fails to perform cell handover, the second access network device can refer to the third report to optimize network parameters, such as adjusting the handover parameter configuration triggered by the voice service, etc. This application does not limit this.
  • the terminal device if the terminal device fails to perform cell handover, and the cell selection fails to select a cell that meets the conditions, the terminal device can re-establish a connection with the access network device of the source cell. Due to the cell handover, It is not caused by the degradation of the signal quality of the source access network equipment in the source cell. Therefore, the signal quality of the source access network equipment in the source cell can meet the communication needs of the terminal equipment and can reduce the long-term downtime of the terminal equipment due to voice service fallback. Cell selection is performed on the E-UTRA frequency point or the communication connection with the network is disconnected.
  • the terminal device if the terminal device performs cell selection and selects an E-UTRA cell that meets the conditions, the terminal device initiates a connection establishment process in the cell.
  • the terminal equipment records an indication information in the third report.
  • the indication information is used to indicate whether the E-UTRA cell accessed by the terminal equipment is an acceptable cell, or the indication information is used to indicate the fallback of the voice service.
  • the type is ordinary (normal) voice service or emergency voice service.
  • the terminal device In the emergency voice service fallback scenario, if the terminal device does not select a suitable cell and selects an acceptable cell, the terminal device also records an indication information in the third report. This indication information can be used to indicate the emergency voice service fallback scenario.
  • the terminal equipment has not selected a suitable cell, or has not selected a suitable E-UTRA cell (the E-UTRA cell may also be called a 4G cell).
  • the network device instructs the terminal device to perform cell redirection due to the terminal device's voice service
  • the terminal device fails to perform cell redirection
  • the terminal device will perform cell selection and select a cell that meets the conditions for access. If a cell that meets the conditions is not selected, the terminal device can re-establish a connection with the access network device of the source cell.
  • the method 1100 provided by the embodiment of the present application will be described below with reference to Figure 7A.
  • the second access network device sends an RRC release message to the terminal device.
  • the RRC release message is used to indicate that the voice service triggers the terminal device to perform redirection.
  • the terminal device receives the RRC release message from the second access network device and determines that the redirection is triggered by the voice service.
  • the RRC release message may include a redirection frequency point for performing redirection.
  • S1102 The terminal device performs redirection, and no cell that meets the conditions is selected at the redirection frequency point.
  • the terminal device records a fifth report, where the fifth report is used to indicate that the terminal device fails to perform redirection.
  • the fifth report further includes a redirection frequency point used to indicate the redirection process.
  • S1103 The terminal device performs cell selection at the E-UTRA frequency point, but a cell that meets the conditions has not yet been selected.
  • the terminal device When the terminal device performs redirection and does not select a cell that meets the conditions at the redirection frequency point, the terminal device performs cell selection on other E-UTRA frequency points other than the redirection frequency point and does not select a cell that meets the conditions. community.
  • S1104 The terminal device performs cell selection at a frequency point other than the E-UTRA frequency point, and selects a suitable cell to establish an RRC connection.
  • the terminal device performs cell selection on other E-UTRA frequencies other than the redirection frequency. If a cell that meets the conditions is not selected, the terminal device performs cell selection again in S1104. This time, the cell selection can be in On frequency points other than E-UTRA, the terminal device performs cell selection on the frequency point where a suitable cell may be selected. For example, the terminal device can perform cell selection on the NR frequency point and selects an NR cell that can be used as a suitable cell. The NR cell establishes an RRC connection.
  • the terminal device sends a fifth report to the second access network device.
  • the fifth report is used to indicate that the terminal device fails to perform redirection.
  • the fifth report may include the fifth indication information in the embodiment shown in FIG. 7 , where the fifth indication information is used to indicate that the terminal device has not selected a cell that meets the conditions.
  • the fifth report may include indication information indicating that the redirection is triggered by the voice service.
  • the second access network device can determine that the terminal device has not selected a device that meets the conditions at the redirection frequency point and other E-UTRA frequency points for a long time due to the redirection triggered by the voice service.
  • the cell enables the second access network device to optimize network parameters and adjust network configuration parameters by referring to the fifth report.
  • the terminal device may record a fourth report.
  • the fourth report can be a successful handover report (SHR) or a random access report.
  • the terminal device records relevant information about potential failure problems during the successful handover process.
  • the embodiment of the present application proposes that the fourth report may include the service interruption duration, so that the access network equipment related to the handover process (such as the source access network equipment and/or the target access network equipment) can refer to the service in the fourth report.
  • the network configuration parameters are optimized according to the interruption duration and the context of the terminal device, thereby reducing the probability of terminal device handover failure.
  • the communication method 1200 provided by the embodiment of the present application is described below with reference to Figure 7B.
  • the source access network device sends a switching command to the terminal device.
  • the switching command is used to instruct the voice service to trigger the terminal device to switch to the first cell.
  • the first cell has a different RAT from the source cell.
  • the terminal device After receiving the handover command, the terminal device starts the fifth timer and performs cell handover.
  • the source network device sends first configuration information to the terminal device, where the first configuration information is used to configure a trigger condition that triggers recording of the fourth report.
  • the trigger condition can include one or more of the following conditions:
  • the timer running time is greater than or equal to the seventh threshold
  • the ratio of the timer's running time to the timer's maximum running time is greater than or equal to the eighth threshold
  • the number of random access attempts by the terminal device to access the target access network device is greater than or equal to the ninth threshold
  • the data transmission interruption time between the terminal device and the access network device is greater than or equal to the tenth threshold value.
  • the first configuration information may include one or more of the seventh threshold, eighth threshold, ninth threshold or tenth threshold.
  • the trigger condition is determined by the source access network device, and the source access network device sends the first configuration information to the terminal device and notifies the terminal device of the trigger condition.
  • the trigger condition is determined by the target access network device, the target access network device sends the first configuration information to the source access network device, and the source access network device forwards the first configuration information to the terminal device. Configuration information to notify the terminal device of the trigger condition through the first configuration information.
  • S1202 The terminal device successfully switches to the first cell managed by the target access network.
  • the terminal device performs cell handover according to the handover command and successfully switches to the first cell managed by the target access network device. After the terminal device successfully switches to the target access network device, it can initiate the TAU update process and complete the TAU update with the target access network device.
  • the target access network device may be an eNodeB in the LTE network.
  • the terminal device establishes a voice service channel with the target access network device.
  • the terminal equipment stops the fifth timer, and the running time of the fifth timer is from the time the terminal equipment receives the switching command to the completion of the switching command.
  • the duration between successful establishment of the voice service channel that is, the duration of voice service interruption.
  • the running time of the fifth timer is the time between when the terminal device receives the handover command and when the terminal device and the target access network device successfully transmit the transmission service data packet.
  • S1104 The terminal device sends a fourth report to the source access network device, where the fourth report includes the running time of the fifth timer.
  • the trigger condition for the terminal device to record the fourth report is met, and the terminal device records the fourth report. For example, if the terminal device successfully completes the random access process with the first cell and the trigger condition for recording the fourth report is met, the terminal device records the fourth report.
  • the fourth report includes third indication information, and the third indication information is used to instruct the terminal device to perform cell switching because the triggering reason is voice service fallback.
  • the third indication information is used to instruct the terminal equipment to perform cell switching because the handover triggering reason is ordinary (normal) voice service fallback or emergency voice service fallback.
  • the terminal device determines that there is a risk of potential handover failure during the handover process from the source cell to the first cell, the terminal device records the fourth report.
  • the fourth report includes the running duration of the fifth timer, so that access network equipment related to the handover process (such as source access network equipment and/or target access network equipment) can refer to the service interruption duration in the fourth report.
  • network configuration parameters can be optimized, such as lowering the switching threshold, etc. In order to reduce the probability of terminal equipment switching failure and/or service interruption time process.
  • the terminal device sends a report (such as one or more reports from the first report to the fifth report) to an access network device, for example, the terminal device access network device A sends a report.
  • the target device of the report is the source access network device, that is, the report needs to be sent to the source access network device, and access network device A and the source access network device are different network devices
  • access network device A sends the above Report some or all of the information to the source access network device.
  • access network device A may also send the report type information to the source access network device.
  • the report type can be a report type of 5G (such as NR or gNB) standard, a report type of 4G (such as eLTE or ng-eNB) standard connected to the 5G core network, or a 4G (such as LTE or eNB) standard connected to the 4G core network. Report type or report type in other formats.
  • access network device A communicates through the interface between the access networks (such as the interface between the base station and the base station) Send some or all of the information in the report to the source access network device.
  • the interface between access network device A and the source access network device may be an X2 interface or an Xn interface.
  • Access network equipment A can send a message to the source through a failure indication (FAILURE INDICATION), a radio link failure format (RLF INDICATION) message, a handover report (HANDOVER REPORT) message, an access and mobility indication (ACCESS AND MOBILITY INDICATION) message, or other messages.
  • the access network equipment sends part or all of the reported information.
  • access network device A can send part or all of the information in the report to the source access network device through the core network device. .
  • access network device A may also send the report type information to the source access network device.
  • the access network device A may send part or all of the information in the report to the core network device through the interface between the access network device and the core network device.
  • access network device A sends part or all of the information in the report to the core network device through the S1 interface or NG interface, and the core network device forwards the information received from access network device A to the source access network device.
  • Access network device A may send part or all of the reported information to the source access network device through at least one of the following messages on the S1 interface/NG interface:
  • Uplink RAN configuration transmission (UPLINK RAN CONFIGURATION TRANSFER) message, downlink RAN configuration transmission (DOWNLIKN RAN CONFIGURATION TRANSFER) message, base station configuration transmission (eNB CONFIGURATION TRANSFER) message, core network equipment configuration transmission (MME CONFIGURATION) TRANSFER) message or other message.
  • UPLINK RAN CONFIGURATION TRANSFER uplink RAN configuration transmission
  • DOWNLIKN RAN CONFIGURATION TRANSFER downlink RAN configuration transmission
  • eNB CONFIGURATION TRANSFER base station configuration transmission
  • MME CONFIGURATION core network equipment configuration transmission
  • the access network device A sends the above Some or all of the reported information is sent to the target access network device.
  • the target access network device For a specific sending method, please refer to the method of sending a report by access network device A to the source access network device. For the sake of brevity, details will not be repeated here.
  • each network element may include a hardware structure and/or a software module to implement the above functions in the form of a hardware structure, a software module, or a hardware structure plus a software module. Whether one of the above functions is performed as a hardware structure, a software module, or a hardware structure plus a software module depends on the specific application and design constraints of the technical solution.
  • Figure 8 is a schematic block diagram of a communication device provided by the present disclosure.
  • the communication device 800 may include a transceiver unit 820 .
  • the communication device 800 may correspond to the terminal device in the above method, or a chip configured in (or used for) the terminal device, or other devices, modules, or devices that can implement the method of the terminal device. circuit or unit, etc.
  • the communication device 800 may include a unit for performing the method performed by the terminal device in the methods shown in FIGS. 2 to 7 and FIGS. 7A and 7B. Moreover, each unit in the communication device 800 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding processes of the methods shown in FIGS. 2 to 7 and FIGS. 7A and 7B.
  • the communication device 800 may also include a processing unit 810, which may be used to process instructions or data to implement corresponding operations.
  • a processing unit 810 which may be used to process instructions or data to implement corresponding operations.
  • the transceiver unit 820 in the communication device 800 may be an input/output interface or circuit of the chip, and the processing in the communication device 800 Unit 810 may be a processor in a chip.
  • the communication device 800 may also include a storage unit 830, which may be used to store instructions or data, and the processing unit 810 may execute the instructions or data stored in the storage unit to enable the communication device to implement corresponding operations. .
  • the transceiver unit 820 in the communication device 800 can be implemented through a communication interface (such as a transceiver or an input/output interface), and can, for example, correspond to the transceiver 910 in the terminal device 900 shown in FIG. 9 .
  • the processing unit 810 in the communication device 800 may be implemented by at least one processor, for example, may correspond to the processor 920 in the terminal device 900 shown in FIG. 9 .
  • the processing unit 810 in the communication device 800 can also be implemented by at least one logic circuit.
  • the storage unit 830 in the communication device 800 may correspond to the memory in the terminal device 900 shown in FIG. 9 .
  • the communication device 800 may correspond to the access network equipment in the above method, for example, or a chip configured in (or used for) the access network equipment, or other devices capable of realizing access. Devices, modules, circuits or units of network equipment and methods.
  • the communication device 800 may include a unit for performing the method performed by the access network device in the methods shown in FIGS. 2 to 7 and FIGS. 7A and 7B. Moreover, each unit in the communication device 800 and the above-mentioned other operations and/or functions are respectively intended to implement the corresponding processes of the methods shown in FIGS. 2 to 7 and FIGS. 7A and 7B.
  • the communication device 800 may further include a processing unit 810, which may be used to process instructions. or data to implement corresponding operations.
  • a processing unit 810 which may be used to process instructions. or data to implement corresponding operations.
  • the transceiver unit 820 in the communication device 800 may be an input/output interface or circuit of the chip.
  • the processing unit 810 may be a processor in a chip.
  • the communication device 800 may also include a storage unit 830, which may be used to store instructions or data, and the processing unit 810 may execute the instructions or data stored in the storage unit to enable the communication device to implement corresponding operations. .
  • the transceiver unit 820 in the communication device 800 can be implemented through a communication interface (such as a transceiver or an input/output interface), for example, it can correspond to the one shown in Figure 10 Transceiver 1010 in network device 1000.
  • the processing unit 1010 in the communication device 1000 may be implemented by at least one processor, for example, may correspond to the processor 1020 in the network device 1000 shown in FIG. 10
  • the processing unit 810 in the communication device 800 may be implemented by at least one logic circuit implementation.
  • the storage unit 830 in the communication device 800 may correspond to the memory in the network device 1000 shown in FIG. 10 .
  • Figure 9 is a schematic structural diagram of a terminal device 900 provided by the present disclosure.
  • the terminal device 900 can be applied in the system as shown in Figure 1 to perform the functions of the terminal device in the above method.
  • the terminal device 900 includes a processor 920 and a transceiver 910.
  • the terminal device 900 further includes a memory.
  • the processor 920, the transceiver 910 and the memory can communicate with each other through internal connection channels and transmit control signals and/or data signals.
  • the memory is used to store computer programs, and the processor 920 is used to execute the computer program in the memory to control the transceiver 910 to send and receive signals.
  • the above-mentioned processor 920 can be used to perform the actions described in the previous method that are implemented internally by the terminal device, and the transceiver 910 can be used to perform the actions that the terminal device sends to or receives from the network device described in the previous method.
  • the transceiver 910 can be used to perform the actions that the terminal device sends to or receives from the network device described in the previous method.
  • the above terminal device 900 may also include a power supply for providing power to various devices or circuits in the terminal device.
  • FIG 10 is a schematic structural diagram of a network device 1000 provided by the present disclosure.
  • the network device 1000 can be applied in the system as shown in Figure 1 to perform the functions of the access network device in the above method.
  • the network device 1000 includes a processor 1020 and a transceiver 1010.
  • the network device 1000 further includes a memory.
  • the processor 1020, the transceiver 1010 and the memory can communicate with each other through internal connection paths to transmit control and/or data signals.
  • the memory is used to store computer programs, and the processor 1020 is used to execute the computer program in the memory to control the transceiver 1010 to send and receive signals.
  • the above-mentioned processor 1020 can be used to perform the actions implemented by the network device described in the previous method, and the transceiver 1010 can be used to perform the actions of the network device sending to or receiving from the network device described in the previous method.
  • the transceiver 1010 can be used to perform the actions of the network device sending to or receiving from the network device described in the previous method.
  • the above-mentioned network device 1000 may also include a power supply for providing power to various devices or circuits in the network device.
  • the processor and the memory can be combined into a processing device, and the processor is used to execute the program code stored in the memory to implement the above functions.
  • the memory can also be integrated in the processor or independent of the processor.
  • This processor may correspond to the processing unit in Figure 8.
  • the transceiver may correspond to the transceiver unit in Figure 8.
  • the transceiver 910 may include a receiver (or receiver, receiving circuit) and a transmitter (or transmitter, transmit circuit). Among them, the receiver is used to receive signals, and the transmitter is used to transmit signals.
  • the processor may be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, which may implement or execute the present disclosure.
  • a general-purpose processor may be a microprocessor or any conventional processor, etc.
  • the steps combined with the method of the present disclosure can be directly embodied as executed by a hardware processor, or executed by a combination of hardware and software modules in the processor.
  • the memory can be a non-volatile memory, such as a hard disk drive (HDD) or a solid-state drive (SSD), etc., or it can be a volatile memory (volatile memory), such as a random access memory.
  • Memory random-access memory, RAM.
  • Memory is, but is not limited to, any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.
  • the memory in this application can also be a circuit or any other device capable of realizing a storage function, used to store program instructions and/or data.
  • the present disclosure also provides a processing device, including a processor and a (communication) interface; the processor is used to perform any of the above methods.
  • the 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), or a system on chip (SoC), or It can be a central processing unit (CPU), a network processor (NP), a digital signal processing circuit (DSP), or a microcontroller unit , MCU), it can also be a programmable logic device (PLD) or other integrated chip.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • SoC system on chip
  • CPU central processing unit
  • NP network processor
  • DSP digital signal processing circuit
  • MCU microcontroller unit
  • PLD programmable logic device
  • the present disclosure also provides a computer program product.
  • the computer program product includes: computer program code.
  • the computer program code When executed by one or more processors, it causes a device including the processor to execute The method shown in Figures 2 to 7 and Figures 7A and 7B.
  • the technical solutions provided by this disclosure can be implemented in whole or in part through software, hardware, firmware, or any combination thereof.
  • software When implemented using software, it may be implemented in whole or in part in the form of a computer program product.
  • the computer program product includes one or more computer instructions.
  • the computer program instructions When the computer program instructions are loaded and executed on a computer, processes or functions according to the present invention are generated in whole or in part.
  • the above 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-readable storage medium may be any available medium that can be accessed by a computer or may contain One or more data storage devices such as servers and data centers integrated with available media.
  • the available media may be magnetic media (eg, floppy disk, hard disk, tape), optical media (eg, digital video disc (digital video disc, DVD)), or semiconductor media, etc.
  • the present disclosure also provides a computer-readable storage medium, which stores program code.
  • the program code When the program code is run by one or more processors, the program code includes the processor.
  • the device executes the methods shown in Figures 2 to 7 and Figures 7A and 7B.
  • the present disclosure also provides a system, which includes one or more of the aforementioned terminal devices.
  • the system may further include one or more of the aforementioned access network devices.
  • the disclosed systems, devices and methods can be implemented through other way to achieve.
  • the devices described above are only illustrative.
  • the division of the units is only a logical function division. In actual implementation, there may be other division methods.
  • multiple units or components may be combined or integrated. to another system, or some features can be ignored, or not implemented.
  • the coupling or direct coupling or communication connection between each other shown or discussed may be through some interfaces, and the indirect coupling or communication connection of the devices or units may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of this solution.

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Abstract

本申请提供了一种通信方法和通信装置，该方法包括：终端设备由源小区重定向至目标小区，其中，该源小区由源接入网设备管理，该目标小区由目标接入网设备管理。该终端设备发送第一报告，该第一报告包括用于指示该终端设备执行小区重定向过程中存在潜在失败的信息，以及包括该目标小区的标识信息。以期通过第一报告为网络参数优化提供参考，提高网络设备对终端设备的移动性管理的效果。

Description

通信方法和通信装置
本申请要求于2022年03月24日提交中国专利局、申请号为202210295971.8、申请名称为“通信方法和通信装置”的中国专利申请的优先权，以及，本申请要求于2022年08月08日提交中国专利局、申请号为202210942532.1、申请名称为“通信方法和通信装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本申请涉及通信领域，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，在移动通信***中支持移动鲁棒性优化(mobility robustness optimization，MRO)机制，MRO是网络自优化的一个重要机制，终端设备发生与移动性相关的失败事件时(例如切换失败、在目标小区的无线链路失败(radio link failure，RLF)等事件时)，通过向网络设备上报失败事件的相关参数，使得网络设备可以对获取到的相关参数进行分析，从而优化网络参数，以避免失败事件的发生。然而，目前MRO机制还不完善。
发明内容
本申请实施例提供一种通信方法和通信装置，以期提高网络设备对终端设备的移动性管理的效果。
第一方面，提供了一种通信方法，该方法可以由终端设备或配置于(或用于)终端设备的模块(如芯片)执行。
该方法包括：终端设备由源小区重定向至目标小区，其中，该源小区由源接入网设备管理，该目标小区由目标接入网设备管理。该终端设备发送第一报告，该第一报告包括用于指示该终端设备执行小区重定向过程中存在潜在失败的信息，以及包括该目标小区的标识信息。
根据上述方案，终端设备向网络设备(如源接入网设备和/或目标接入网设备)发送第一报告，通知终端设备执行小区重定向过程中存在潜在失败的风险，以便网络设备在进行网络参数优化时可以将第一报告作为参考，减小终端设备发生小区重定向失败的概率，从而提高网络设备对终端设备的移动性管理的效果。
作为示例非限定，该第一报告包括重定向成功报告、或者随机接入报告、或者连接建立失败报告。
结合第一方面，在第一方面的某些实施方式中，该方法还包括：在该终端设备重定向过程满足报告条件的情况下，该终端设备记录该第一报告，其中，该报告条件包括以下一种或多种条件：
第一计时器的运行时长小于或等于第一门限值，且大于或等于第二门限值，该第一计时器的运行时长为该终端设备接收到来自该源接入网设备的无线资源控制(radio resource control，RRC)释放消息到该终端设备向该目标接入网设备发送随机接入前导码之间的时长；
第二计时器的运行时长小于或等于第三门限值，且大于或等于第四门限值，该第二计时器的运行时长为该终端设备接收到来自该源接入网设备的RRC释放消息到该终端设备接收到来自该目标接入网设备的RRC连接建立消息之间的时长；
第三计时器的运行时长小于或等于第五门限值，且大于或等于第六门限值，该第三计时器的运行时长为该终端设备向该目标接入网设备发送RRC连接请求消息到该终端设备接收到来自该目标接入网设备的RRC连接建立消息之间的时长；
该终端设备在第一频点执行小区重定向失败，且在该第一频点以外的频点执行小区重定向成功，该第一频点为该源接入网设备为该终端设备配置的用于小区重定向的候选频点，该目标小区的频点为该第一频点以外的频点。
根据上述方案，当终端设备执行的小区重定向过程满足上述条件1、条件2或条件4中的一项或多项时，可以认为终端设备的小区重定向过程存在潜在失败的风险，终端设备记录第一报告，并可以向网络设备发送第一报告，以便网络设备能够参考第一报告进行网络参数优化，提高网络设备对终端设备的移动性管理的效果。
结合第一方面，在第一方面的某些实施方式中，该第二门限值为该第一门限值与第一系数的乘积，和/或，该第四门限值为该第三门限值与第二系数的乘积，和/或，该第六门限值为该第五门限值与第三系数的乘积，其中，该第一系数、该第二系数和该第三系数小于1。
结合第一方面，在第一方面的某些实施方式中，该方法还包括：该终端设备接收第一指示信息，该第一指示信息用于指示该报告条件。
根据上述方案，网络设备可以为终端设备配置发送第一报告的报告条件，以便终端设备能够基于网络设备的配置需求，向网络设备提供用于网络参数优化的报告。
结合第一方面，在第一方面的某些实施方式中，该终端设备接收第一指示信息，包括：该终端设备接收RRC消息，该RRC消息包括该第一指示信息。
作为示例非限定，RRC消息可以是包括但不限于RRC建立(RRC Setup)消息、RRC重配置(RRC Reconfiguration)消息、RRC重建立(RRC Reestablishment)消息、RRC恢复(RRC Resume)消息、RRC释放(RRC Release)消息的一种或多种。
根据上述方案，源接入网设备可以通过RRC消息通知终端设备发送第一报告的报告条件，以便终端设备能够基于网络设备的配置需求，记录用于网络参数优化的报告，并提供给网络设备。
结合第一方面，在第一方面的某些实施方式中，该第一报告用于指示以下一项或多项：
该报告条件、该源小区的标识信息、小区测量信息、该重定向频点信息、该目标小区的标识信息、该目标小区的频点信息、该第一计时器的运行时长、该第二计时器的运行时长、该第三计时器的运行时长，或第四计时器的运行时长。
小区的标识信息可以包括小区标识信息，小区标识信息可以是小区的小区全局标识(cell global identifier，CGI)、物理小区标识(physical cell identifier，PCI)和频点、非公网标识(non-public network identifier,NPN ID)、非陆地网络标识(non-terrestrial network identifier,NTN ID)或者其它小区标识中的至少一种。可选的，小区的标识信息还可以包括跟踪区码(tracking area code，TAC)和/或小区所属的网络设备的标识信息，比如全局网络设备标识。CGI可以包括公共陆地移动网络(public land mobile network，PLMN ID)和cell ID。
其中，该小区测量信息包括该源小区的测量信息、目标小区的测量信息、源小区的邻小区的测量信息或目标小区的邻小区的测量信息的一种或多种，小区的测量信息可以包括终端设备测量小区的信号(如参考信号)得到的测量结果。以及，第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功建立业务通道之间的时长，或者第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功传输业务数据包之间的时长。
根据上述方案，该第一报告可以包括以上信息中的一项或多项，终端设备通过第一报告为网络设备提供终端设备重定向的相关信息，以便网络设备能够参考第一报告中的信息进行精准地网络参数优化，提高网络设备对终端设备的移动性管理的效果。
结合第一方面，在第一方面的某些实施方式中，该终端设备发送第一报告，包括：该终端设备向该目标接入网设备发送该第一报告。
根据上述方案，该第一报告可以是发送给目标接入网设备的报告，使得目标接入网设备可以参考第一报告对目标小区的配置进行优化。
结合第一方面，在第一方面的某些实施方式中，该终端设备发送第一报告，包括：该终端设备向该源接入网设备发送该第一报告，该第一报告包括该源小区的标识信息。
根据上述方案，该第一报告可以是发送给源接入网设备的报告，使得源接入网设备可以参考第一报告对源小区的配置进行优化。
结合第一方面，在第一方面的某些实施方式中，该第一报告还包括第二指示信息，该第二指示信息用于指示该小区重定向是由业务触发的或由信号覆盖质量触发的。可选地，该业务可以是语音业务。
根据上述方案，终端设备通过第一报告中的第二指示信息通知网络设备小区重定向是由业务触发的或者由信号覆盖质量触发的，以便网络设备可以基于第二指示信息确定小区重定向的触发原因，更精准地进行网络参数优化，减小不必要的或错误的网络参数优化。
结合第一方面，在第一方面的某些实施方式中，该小区重定向是由业务触发的，该目标接入网设备与该源接入网设备采用的无线接入技术(radio access technology，RAT)不同。
第二方面，提供了一种通信方法，有益效果可以参见第一方面的描述此处不再赘述。该方法可以由接入网设备或配置于(或用于)接入网设备的模块(如芯片)执行。
该方法包括：接收来自终端设备的第一报告，该第一报告包括用于指示该终端设备执行小区重定向过程中存在潜在失败的信息，以及包括该终端设备重定向的目标小区的标识信息，该目标小区由目标接入网设备管理。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：向源接入网设备发送该第一报告，该第一报告包括该终端设备重定向的源小区的标识信息，该源小区由该源接入网设备管理。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：根据该第一报告，调整网络配置参数。
结合第二方面，在第二方面的某些实现方式中，该第一报告用于指示触发该终端设备发送该第一报告的报告条件，该报告条件包括以下一种或多种条件：
第一计时器的运行时长小于或等于第一门限值，且大于或等于第二门限值，该第一计时器的运行时长为该终端设备接收到来自源接入网设备的无线资源控制RRC释放消息到 该终端设备向该目标接入网设备发送随机接入前导码之间的时长；
第二计时器的运行时长小于或等于第三门限值，且大于或等于第四门限值，该第二计时器的运行时长为该终端设备接收到来自该源接入网设备的RRC释放消息到该终端设备接收到来自该目标接入网设备的RRC连接建立消息之间的时长；
第三计时器的运行时长小于或等于第五门限值，且大于或等于第六门限值，该第三计时器的运行时长为该终端设备向该目标接入网设备发送RRC连接请求消息到该终端设备接收到来自该目标接入网设备的RRC连接建立消息之间的时长；
该终端设备在第一频点执行小区重定向失败，且在该第一频点以外的频点执行小区重定向成功，该第一频点为该源接入网设备为该终端设备配置的用于小区重定向的候选频点，该目标小区的频点为该第一频点以外的频点。
其中，该源接入网设备管理该小区重定向的源小区。
结合第二方面，在第二方面的某些实现方式中，该第二门限值为该第一门限值与第一系数的乘积，和/或，该第四门限值为该第三门限值与第二系数的乘积，和/或，该第六门限值为该第五门限值与第三系数的乘积，其中，该第一系数、该第二系数和该第三系数小于1。
结合第二方面，在第二方面的某些实现方式中，该第一报告用于指示以下一项或多项：
该源小区的标识信息、该目标小区的标识信息、小区测量信息、该重定向频点信息、该目标小区的频点信息、该第一计时器的运行时长、该第二计时器的运行时长、该第三计时器的运行时长或第四计时器的运行时长，
其中，该小区测量信息包括该源小区的测量信息、目标小区的测量信息、该源小区的邻小区的测量信息或该目标小区的测量信息中的一种或多种，第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功建立业务通道之间的时长，或者第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功传输业务数据包之间的时长。
结合第二方面，在第二方面的某些实现方式中，该方法还包括：向该终端设备发送第一指示信息，该第一指示信息用于指示该报告条件。
结合第二方面，在第二方面的某些实现方式中，该向该终端设备发送第一指示信息，包括：向该终端设备发送RRC消息，该RRC消息包括该第一指示信息。
结合第二方面，在第二方面的某些实现方式中，该第一报告还包括第二指示信息，该第二指示信息用于指示该小区重定向是由业务触发的或由信号覆盖质量触发的。可选地，该业务可以是语音业务。
结合第二方面，在第二方面的某些实现方式中，该终端设备重定向是由业务触发的，该目标接入网设备与源接入网设备采用的无线接入技术RAT不同，该源接入网设备管理该小区重定向的源小区。
第三方面，提供了一种通信方法，该方法可以由终端设备或配置于(或用于)终端设备的模块(如芯片)执行。
该方法包括：终端设备向第一小区切换失败。所述终端设备在第二小区与接入网设备建立通信连接，所述接入网设备管理该第二小区。所述终端设备向该接入网设备发送第二报告，所述第二报告用于指示终端设备向所述第一小区切换失败，所述第二报告包括第四指示信息，所述第四指示信息用于指示所述终端设备向所述第一小区切换是由业务触发的， 或者是由信号覆盖质量触发的。可选地，该业务可以是语音业务。
作为示例非限定，该第二报告为无线链路失败报告或者连接建立失败报告。
根据上述方案，终端设备执行小区切换后，向网络设备发送第二报告以通知网络设备终端设备向第一小区切换失败，以便网络设备参考第二报告进行网络参数优化。第二报告中包括指示触发小区切换的切换原因，能够提高网络参数优化的精度，减小不必要的或错误的网络参数优化
结合第三方面，在第三方面的某些实现方式中，所述第一小区与所述第二小区采用的无线接入技术RAT相同。
例如，终端设备由源小区执行异制式网络(或者称为异***)小区切换，源接入网设备指示终端设备切换至与源小区RAT不同的第一小区。终端设备向第一小区切换失败，则终端设备继续在与第一小区所在网络的制式(或者***)相同的网络执行小区选择以尝试接入网络，也就是说，终端设备选择与第一小区RAT相同的小区，如成功选择到合适的小区，即与第一小区RAT相同的第二小区，终端设备在第二小区与接入网设备建立通信连接。因此，第二小区与第一小区的RAT相同。
结合第三方面，在第三方面的某些实现方式中，所述第一小区与所述第二小区采用的无线接入技术RAT不同。
再例如，源接入网设备指示终端设备切换至与源小区RAT不同的第一小区。终端设备向第一小区切换失败，则终端设备继续在与第一小区所在网络的制式(或者***)相同的网络执行小区选择，选择满足条件的小区以尝试接入网络设备。如果是普通语音业务，满足条件指的是合适小区的条件；如果是紧急语音业务，满足条件指的是合适小区和可接受小区的条件。如果是紧急语音业务，终端设备首先尝试选择合适的小区，如果没有选择到合适的小区，终端设备可以选择可接受的小区。但终端设备未选择到满足条件的小区，终端设备与源小区重新建立连接。即该示例中第二小区为终端设备的源小区，第二小区与第一小区的RAT不同。
第四方面，提供了一种通信方法，该方法可以由接入网设备或配置于(或用于)接入网设备的模块(如芯片)执行。
该方法包括：接收来自终端设备的第二报告，所述第二报告用于指示终端设备向所述第一小区切换失败，所述第二报告包括第四指示信息，所述第四指示信息用于指示所述终端设备向所述第一小区切换是由业务触发的，或者是由信号覆盖质量触发的。
第五方面，提供了一种通信装置，一种设计中，该装置可以包括执行第一方面中所描述的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该装置包括：
处理单元，用于确定终端设备由源小区重定向至目标小区，其中，所述源小区由源接入网设备管理，所述目标小区由目标接入网设备管理；
收发单元，用于发送第一报告，所述第一报告包括用于指示所述终端设备执行小区重定向过程中存在潜在失败的信息，以及包括所述目标小区的标识信息。
结合第五方面，在第五方面的某些实现方式中，该收发单元具体用于在该小区重定向过程满足报告条件的情况下发送该第一报告。其中，该报告条件可以参考前文中的描述，为了简要，在此不再赘述。
结合第五方面，在第五方面的某些实现方式中，该收发单元还用于接收第一指示信息， 该第一指示信息用于指示该报告条件。
结合第五方面，在第五方面的某些实现方式中，该收发单元具体用于接收RRC消息，该RRC消息包括该第一指示信息。
结合第五方面，在第五方面的某些实现方式中，该第一报告用于指示以下一项或多项：
该报告条件、该源小区的标识信息、该目标小区的标识信息、小区测量信息、该重定向频点、该目标小区的频点、该第一计时器的运行时长、该第二计时器的运行时长、该第三计时器的运行时长或该第四定时器的运行时长。
其中，该小区测量信息包括该源小区的测量信息、目标小区的测量信息和源小区的邻小区的测量信息或目标小区的邻小区的测量信息的一种或者多种，第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功建立业务通道之间的时长，或者第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功传输业务数据包之间的时长。
结合第五方面，在第五方面的某些实现方式中，该收发单元具体用于向该目标接入网设备发送该第一报告。
结合第五方面，在第五方面的某些实现方式中，该收发单元具体用于向该源接入网设备发送该第一报告，该第一报告包括该源小区的标识信息。
结合第五方面，在第五方面的某些实现方式中，该第一报告还包括第二指示信息，该第二指示信息用于指示该小区重定向是由业务触发的或由信号覆盖质量触发的。可选地，该业务可以是语音业务。
结合第五方面，在第五方面的某些实现方式中，该终端设备发送第一报告，包括：该小区重定向是由语音业务触发的，该目标接入网设备与该源接入网设备采用的无线接入技术RAT不同。
第六方面，提供了一种通信装置，一种设计中，该装置可以包括执行第二方面中所描述的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该装置包括：收发单元，用于接收来自终端设备的第一报告，该第一报告包括用于指示该终端设备执行小区重定向过程中存在潜在失败的信息，以及包括该小区重定向的目标小区的标识信息，该目标小区由目标接入网设备管理。处理单元，用于根据该第一报告确定终端设备执行小区重定向过程中存在潜在失败。
结合第六方面，在第六方面的某些实现方式中，该收发单元还用于向源接入网设备发送该第一报告，该第一报告包括该小区重定向的源小区的标识信息，该源小区由该源接入网设备管理。
结合第六方面，在第六方面的某些实现方式中，该处理单元还用于根据该第一报告，调整网络配置参数。
结合第六方面，在第六方面的某些实现方式中，该第一报告用于指示触发该终端设备发送该第一报告的报告条件。其中，该报告条件可以参考前文中的描述，为了简要，在此不再赘述。
结合第六方面，在第六方面的某些实现方式中，该第一报告用于指示以下一项或多项：
该源小区的标识信息、该目标小区的标识信息、小区测量信息、该重定向频点、该目标小区的频点、该第一计时器的运行时长、该第二计时器的运行时长或该第三计时器的运行时长，
其中，该小区测量信息包括该源小区的测量信息、目标小区的测量信息和源小区的邻小区的测量信息或目标小区的邻小区的测量信息的一种或者多种，第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功建立业务通道之间的时长，或者第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功传输业务数据包之间的时长。
结合第六方面，在第六方面的某些实现方式中，该收发单元还用于向该终端设备发送第一指示信息，该第一指示信息用于指示该报告条件。
结合第六方面，在第六方面的某些实现方式中，该收发单元具体用于向该终端设备发送RRC释放消息，该RRC释放消息包括该第一指示信息。
结合第六方面，在第六方面的某些实现方式中，该第一报告还包括第二指示信息，该第二指示信息用于指示该小区重定向是由业务触发的或由测量结果触发的。可选地，该业务可以是语音业务
结合第六方面，在第六方面的某些实现方式中，该小区重定向是由业务触发的，该目标接入网设备与源接入网设备采用的无线接入技术RAT不同，该源接入网设备管理该小区重定向的源小区。
第七方面，提供了一种通信装置，一种设计中，该装置可以包括执行第三方面中所描述的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该装置包括：处理单元，用于确定终端设备向第一小区切换失败。以及，该处理单元还用于确定所述终端设备与第二小区建立通信连接。收发单元，用于向接入网设备发送第二报告，所述第二报告用于指示终端设备向所述第一小区切换失败，所述第二报告包括第四指示信息，所述第四指示信息用于指示所述终端设备向所述第一小区切换是由业务触发的，或者是由信号覆盖质量触发的，其中，所述接入网设备管理的该第二小区。
第八方面，提供了一种通信装置，一种设计中，该装置可以包括执行第四方面中所描述的方法/操作/步骤/动作所一一对应的模块，该模块可以是硬件电路，也可是软件，也可以是硬件电路结合软件实现。一种设计中，该装置包括：收发单元，用于接收来自所述终端设备的第二报告，所述第二报告用于指示终端设备向所述第一小区切换失败，所述第二报告包括第四指示信息，所述第四指示信息用于指示所述终端设备向所述第一小区切换是由业务触发的，或者是由信号覆盖质量触发的，其中，所述第二小区为所述接入网设备管理的小区。处理单元，用于根据该第四指示信息确定该终端设备向第一小区切换是由业务触发的，或者由信号覆盖质量触发的。
第九方面，提供了一种通信装置，包括处理器。该处理器可以实现上述第一方面或第三方面以及第一方面或第三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，该处理器与该存储器耦合，可用于执行存储器中的指令，以实现上述第一方面或第三方面以及第一方面或第三方面中任一种可能实现方式中的方法。可选地，该通信装置还包括通信接口，处理器与通信接口耦合。本申请实施例中，通信接口可以是收发器、管脚、电路、总线、模块或其它类型的通信接口，不予限制。
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。
第十方面，提供了一种通信装置，包括处理器。该处理器可以实现上述第二方面或第四方面以及第二方面或第四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，该处理器与该存储器耦合，可用于执行存储器中的指令，以实现上述第二方面或第四方面以及第二方面或第四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，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网络设备中的芯片。当该通信装置为配置于第一网络设备中的芯片时，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。
第十一方面，提供了一种处理器，包括：输入电路、输出电路和处理电路。该处理电路用于通过该输入电路接收信号，并通过该输出电路发射信号，使得该处理器执行上述第一方面至第四方面以及第一方面至第四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。
第十二方面，提供了一种计算机程序产品，该计算机程序产品包括：计算机程序(也可以称为代码，或指令)，当该计算机程序被运行时，使得计算机执行上述第一方面至第四方面以及第一方面至第四方面中任一种可能实现方式中的方法。
第十三方面，提供了一种计算机可读存储介质，该计算机可读存储介质存储有计算机程序(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四方面以及第一方面至第四方面中任一种可能实现方式中的方法。
第十四方面，提供了一种通信***，包括前述的至少一个第五方面提供的通信装置和至少一个第六方面提供的通信装置。和/或，包括前述的至少一个第七方面提供的通信装置和至少一个第八方面提供的通信装置。
附图说明
图1是本申请实施例提供的通信***的一个示意图；
图2是本申请实施例提供的通信方法的一个示意性流程图；
图3是本申请实施例提供的小区重定向过程的一个示意性流程图；
图4是本申请实施例提供的通信方法的示意性流程图；
图5是本申请实施例提供的通信方法的另一个示意性流程图；
图6是本申请实施例提供的通信方法的另一个示意性流程图；
图7是本申请实施例提供的通信方法的另一个示意性流程图；
图7A是本申请实施例提供的通信方法的另一个示意性流程图；
图7B是本申请实施例提供的通信方法的另一个示意性流程图；
图8是本申请实施例提供的通信装置的示意性框图；
图9是本申请实施例提供的终端设备的示意性结构图；
图10是本申请实施例提供的网络设备的示意性结构图。
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。
在本申请实施例中，“/”可以表示前后关联的对象是一种“或”的关系，例如，A/B可以表示A或B；“和/或”可以用于描述关联对象存在三种关系，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，其中A，B可以是单数或者复数。为了便于描述本申请实施例的技术方案，在本申请实施例中，可以采用“第一”、“第二”等字样进行区分。该“第一”、“第二”等字样并不对数量和执行次序进行限定，并且“第一”、“第二”等字样也并不限定一定不同。在本申请实施例中，“示例性的”或者“例如”等词用于表示例子、例证或说明，被描述为“示例性的”或者“例如”的任何实施例或设计方案不应被解释为比其它实施例或设计方案更优选或更具优势。使用“示例性的”或者“例如”等词旨在以具体方式呈现相关概念，便于理解。在本申请实施例中，至少一个(种)还可以描述为一个(种)或多个(种)，多个(种)可以是两个(种)、三个(种)、四个(种)或者更多个(种)，本申请不做限制。
本申请实施例的技术方案可以应用于各种通信***，例如：长期演进(long term evolution，LTE)***、LTE频分双工(frequency division duplex，FDD)***、LTE时分双工(time division duplex，TDD)、通用移动通信***(universal mobile telecommunication system，UMTS)、全球互联微波接入(worldwide interoperability for microwave access，WiMAX)通信***、第五代(5th generation，5G)通信***，以及本申请提供的通信方法还可以应用于未来演进的公用陆地移动通信网络(public land mobile network，PLMN)中的通信***或其他通信***等。本申请对此不作限定。
图1是适用于本申请实施例的无线通信***100的示意图。
如图1所示，该无线通信***100可以包括至少接入网设备，例如图1所示的接入网设备110和接入网设备120。该无线通信***100还可以包括至少一个终端设备，例如图1所示的终端设备130。一个接入网设备可以管理至少一个小区，例如，接入网设备110管理小区1，接入网设备120管理小区2。当终端设备进入一个小区的覆盖范围内，终端设备可以接入该小区，并通过该小区与管理该小区的接入网设备通信，例如，终端设备130进入小区1的覆盖范围内，可以接入小区1，通过小区1获取接入网设备110的通信服务，即小区1作为终端设备的服务小区。在终端设备的移动过程中可能会发生小区切换或重定向，例如终端设备移动到小区2的覆盖范围内且小区2的信号质量较好，终端设备可以从小区1切换或重定向到小区2，断开与小区1的连接，接入小区2。或者终端设备可以因业务触发，由小区1切换或重定向至小区2。例如，接入网设备110与接入网设备120采用的无线接入技术不同，终端设备可以因语音业务触发，由小区1切换或重定向至小区2。
对于终端设备由小区1切换至小区2的场景，接入网设备110通过与接入网设备120进行信息交互后，指示终端设备切换至小区2，并为终端设备130提供小区2的相关接入信息，终端设备根据接入网设备110的指示接入小区2，通过小区2获取接入网设备120 的通信服务，即小区2作为终端设备的服务小区，从而完成由小区1切换至小区2。其中，小区1可以称为终端设备切换的源小区，小区2可以称为终端设备切换的目标小区。
对于终端设备由小区1(可以称为重定向的源小区)重定向至小区2(可以称为重定向的目标小区)的场景，终端设备可以在接入网设备110提供的候选频点上进行小区选择，确定将小区2作为重定向的目标小区后，接入小区2，通过小区2获取接入网设备120的通信服务，即小区2作为终端设备的服务小区，从而完成由小区1重定向至小区2。
本申请实施例中的终端设备也可以称为用户设备(user equipment，UE)、接入终端、用户单元、用户站、移动站、移动台、远方站、远程终端、移动设备、用户终端、终端、无线通信设备、用户代理或用户装置。本申请的实施例中的终端设备可以是手机(mobile phone)、平板电脑(pad)、带无线收发功能的电脑、虚拟现实(virtual reality，VR)终端设备、增强现实(augmented reality，AR)终端设备、车载设备、可穿戴设备或者未来演进的PLMN中的终端设备等。
应理解，本申请实施例对于终端设备的具体形式不作限定。
本申请实施例中的接入网节点可以是一种具有无线收发功能的设备，也可以称作接入网设备或网络设备。该设备包括但不限于：具有部分或全部基站功能的设备，例如演进型基站(evolved NodeB，eNodeB)、第五代(5th generation，5G)移动通信***中的下一代基站(next generation NodeB，gNB)、第六代(6th generation，6G)移动通信***中的下一代基站、未来移动通信***中的基站、发送接收点(transmission reception point，TRP)、无线保真(wireless fidelity，WIFI)***中的接入点(access point，AP)、无线中继节点、无线回传节点等设备。
在一些部署中，接入网节点可以包括集中式单元(centralized unit，CU)和/或分布式单元(distributed unit，DU)。CU和DU可以分别实现基站的部分功能，比如，CU负责处理非实时协议和服务，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负责处理物理层协议和实时服务，实现无线链路控制(radio link control，RLC)层、媒体接入控制(media access control，MAC)层和物理(physical，PHY)层的功能。接入网节点还可以包括有源天线单元(active antenna unit，AAU)，AAU可以实现部分物理层处理功能、射频处理及有源天线的相关功能。
下面首先对本申请实施例涉及的相关技术及术语进行描述。
一、小区和载波
小区可以理解为通过小区识别码进行标识的无线信号的覆盖区域。从资源管理角度来看，小区是网络设备对无线通信资源进行管理的单元，小区的物理层资源包括载波，载波是用来承载接入网设备的无线信号的物理资源，载波以载波频点和载波频带的带宽来表征，载波可以称为小区的工作载波，载波频点可以称为小区的工作频点。
二、小区选择
终端设备可以通过扫频的方式在候选频点(或者称为候选小区频点)上执行小区选择，即终端设备通过扫频在候选频点上检测小区的同步信号，并基于检测到的同步信号获取小区的信号质量，从而选择是否接入该小区。
三、小区切换
终端设备连接的接入网设备(即源接入网设备)基于测量结果确定终端设备待切换的 目标小区，并与管理该目标小区的目标接入网设备进行信息交互(如资源请求、数据转发等)完成切换准备，再通过切换命令指示终端设备切换至该目标小区，待终端设备成功接入目标小区后，由目标接入网设备通知源接入网设备释放该终端设备的资源。
四、小区重定向
源接入网设备可以在终端设备处于连接态时为终端设备配置执行小区重定向的一个或多个候选频点，终端设备在源小区接收到来自源接入网设备的无线资源控制(radio resource control，RRC)释放消息后，在该一个或多个候选频点执行小区选择，选择到一个目标小区并接入该小区的过程称为由源小区重定向至目标小区的小区重定向过程。终端设备的小区重定向可以是基于信号覆盖质量触发的，如网络设备可以基于终端设备上报的测量结果确定服务小区的覆盖和/或服务小区的邻小区的覆盖，从而触发终端设备的重定向，比如，网络设备根据终端设备上报的测量结果确定服务小区信号质量差，如服务小区信号质量低于预设门限值或服务小区信号质量低于邻小区信号质量，从而确定服务小区信号覆盖质量差，触发终端设备的重定向。或者，网络设备根据终端设备上报的测量结果确定邻小区信号质量较好，如根据测量报告确定邻小区信号质量高于服务小区质量、邻小区信号质量高于预设门限值等，确定邻小区信号质量较好。或者，终端设备的小区重定向可以是基于语音业务触发的。
小区重定向与小区切换的区别在于，小区切换是终端设备切换的目标小区是由源接入网设备在与目标接入网设备交互后指示给终端设备的，由终端设备基于源接入网设备提供的目标小区的相关信息接入该目标小区。而对于小区重定向，源接入网设备为终端设备提供候选频点，终端设备重定向的目标小区是由终端设备在候选频点上进行小区选择后选择的。
五、语音业务
语音业务作为移动通信网络的核心业务之一，进入***(4th generation，4G)移动通信网络的网络协议(internet protocol，IP)时代后由分组交换(paket switch，PS)域代替了电路交换(circuit switch，CS)域，主要采用的语音策略为基于IP多媒体子***(IP multimedia subsystem，IMS)的LTE语音(voice over LTE，VoLTE)和CS回落(CS fallback)两种方式。在5G移动通信网络中，若终端设备连接的NR小区(即采用NR无线接入技术的小区)不支持基于IMS的NR语音(voice over NR，VoNR)策略，网络可以通过指示终端设备执行小区切换或小区重定向的方式将终端设备回落(voice fallback)到4G网络中的小区中完成语音业务；如果终端设备在连接的NR小区中的VoNR业务质量不理想时，终端设备当前连接的5G网络中的接入网设备可以指示终端设备执行小区切换或小区重定向，终端设备通过执行小区切换或小区重定向连接到4G网络中的接入网设备，从而在4G网络的小区中完成语音业务。当语音业务结束后，通过快速返回(fast return)机制回到NR小区。语音业务可以是普通语音业务，也可以是紧急语音业务。作为一种实现方式，本申请中的“业务”可以理解为“语音业务”。
六、小区选择过程中的合适小区(suitable cell)和可接受小区(acceptable cell)
合适小区是指终端设备可驻留并可以获得正常服务的小区。合适小区应满足如下要求：
-小区是所选择的PLMN或者注册的PLMN或者等效的PLMN的一部分。
-小区不被禁止；
-该小区不是“禁止提供漫游的跟踪区域”列表的一部分；
-满足小区选择标准。
可接受小区是指终端设备可驻留并可以获得受限服务的小区。可接受小区应满足下面的要求：
-小区不被禁止；
-满足小区选择的标准。
上述可接受小区的要求是NR网络中发起一次紧急呼叫以及接收地震海啸警报***(earthquake and tsunami warning system，ETWS)和商用移动预警***(commercial mobile alert system，CMAS)通知所需的最低要求。
下面结合附图对本申请实施例提供的通信方法进行说明。
图2是本申请实施例提供的通信方法200的一个示意性流程图。
S201，终端设备由源小区重定向至目标小区。
其中，源小区由源接入网设备管理，目标小区由目标接入网设备管理。需要说明的是，在本申请实施例中，小区重定向的源小区是终端设备执行小区重定向前的服务小区，目标小区是终端设备通过小区重定向接入网络的小区，即执行小区重定向后的服务小区。
一种实施方式中，终端设备的小区重定向是由语音业务触发的。
例如，终端设备的服务小区为NR小区，该NR小区所在的5G网络不支持VoNR策略，无法为终端设备提供语音业务服务。当终端设备存在待发送的语音业务数据或待接收的语音业务数据时，源接入网设备指示终端设备通过小区重定向的方式回落到4G网络中的小区以完成语音业务数据传输。具体地，源接入网设备可以向终端设备发送RRC释放消息，通过RRC释放消息指示终端设备执行小区重定向。该RRC释放消息还指示了用于终端设备执行小区重定向的一个或多个候选频点，RRC释放消息指示的候选频点为4G网络的演进的通用移动通信***(universal mobile telecommunications system，UMTS)陆地无线接入(evolved-UMTS terrestrial radio access，E-UTRA)频点。其中，E-UTRA是4G网络中的接入网技术，E-UTRA频点是4G的无线接入频点，即4G网络中的小区的工作频点，4G网络中的小区可以称为E-UTRA小区，即采用E-UTRA技术的小区。终端设备在E-UTRA候选频点上执行小区选择，以便通过4G网络中的小区接入4G网络进行语音业务数据传输。或者，源小区所在网络支持VoNR，但终端设备在该支持VoNR的小区的语音业务质量不满足业务需求，源接入网设备可以指示终端设备执行小区重定向。本申请对此不作限定。
另一种实施方式中，终端设备的小区重定向是由信号覆盖质量触发的。
例如，源小区为终端设备的服务小区时，终端设备可以测量附近小区(可以称为邻小区)的信号质量，并向源接入网设备发送测量报告以通知源接入网设备邻小区信号质量的测量结果。源接入网设备可以基于测量结果确定源小区的信号覆盖质量差或确定邻小区的信号覆盖质量较好，从而指示终端设备执行小区重定向。具体地，源接入网设备可以通过RRC释放消息指示终端设备执行小区重定向，该RRC释放消息还指示了终端设备执行小区重定向的一个或多个候选频点。该一个或多个候选频点可以称为重定向频点。可选地，该候选频点可以包括信号质量高于源小区的邻小区的频点。终端设备在候选频点执行小区选择以便重新接入一个小区。但本申请不限于此，触发小区重定向的测量结果可以是终端设备测量得到的源小区信号质量，在源小区的信号质量不满足服务质量需求的情况下，或者在源小区的邻小区的信号质量较好的情况下，源接入网设备可以指示终端设备执行小区 重定向。
示例性地，终端设备由源小区重定向至目标小区的小区重定向过程可以如图3所示。源接入网设备在S301中向终端设备发送RRC释放消息，该RRC释放消息用于指示终端设备与网络之间的RRC连接被释放，且还指示了终端设备执行小区重定向。该RRC释放消息可以包括终端设备执行小区重定向的候选频点的信息，该终端设备在源接入网设备指示的候选频点上选择重定向的小区。终端设备确定目标小区后，在S302中向目标接入网设备发送随机接入前导码，目标接入网设备在接收到该随机接入前导码的情况下，在S303中向终端设备发送随机接入响应消息，实现了终端设备与目标接入网设备在目标小区通信。终端设备继续在S304中向目标接入网设备发送的RRC连接请求消息，以请求与网络建立无线资源控制连接。目标接入网设备基于RRC连接请求消息确定是否允许终端设备接入网络，若允许终端设备接入网络，目标接入网设备在S305中向终端设备发送RRC连接建立消息，通过该RRC连接建立消息为终端设备配置相应RRC资源，终端设备在完成资源配置后，在S306向目标接入网设备发送RRC建立完成消息，终端设备与网络再次建立RRC连接，完成了由源小区重定向至目标小区的小区重定向过程。
S202，终端设备发送第一报告，该第一报告包括用于指示终端设备执行重定向过程中存在潜在失败的信息，以及包括目标小区的标识信息。
该第一报告可以用于指示终端设备执行小区变更的原因信息。比如，原因信息可以指示可以为语音业务回落，或者原因可以是为普通(正常)语音业务回落，或者紧急语音业务回落。
终端设备由源小区成功重定向至目标小区后，若终端设备由源小区重定向至目标小区的过程中存在潜在失败的风险，终端设备发送第一报告，以通知网络该小区重定向过程中存在潜在失败的风险，使得网络能够参考终端设备的第一报告进行网络参数优化，以提升网络性能，减小移动性失败事件发生的概率。
一个示例中，该第一报告可以称为重定向成功报告。
另一个示例中，该第一报告可以称为随机接入报告，该第一报告还用于指示终端设备和目标小区随机接入的原因是由业务触发的。
例如，该第一报告指示了终端设备和目标小区随机接入的原因是由业务触发的，以及第一报告还指示了终端设备执行小区重定向过程中存在潜在失败的信息。
又一个示例中，该第一报告可以称为连接建立失败报告，该第一报告指示了终端设备与第三方接入网设备(第三方接入网设备是源接入网设备和目标接入网设备以外的接入网设备)连接建立失败。
例如，终端设备在重定向频点中的第一频点执行小区重定向失败，具体地，终端设备在该第一频点尝试与第三方接入网设备建立连接，如终端设备尝试接入该第三方接入网设备，但连接建立失败，终端设备记录第一报告，该第一报告指示了终端设备与该第三方接入网设备连接建立失败。可选的，第一报告也可以指示终端设备执行小区重定向过程中存在失败的信息。
需要说明的是，终端设备向网络发送第一报告，可以是终端设备向目标接入网设备发送第一报告，和/或可以是终端设备向源接入网设备发送第一报告。而终端设备向一个接入网设备(如目标接入网设备和/或源接入网设备)发送的第一报告可以通过网络中的其他网络设备传递至该接入网设备，本申请对此不作限定。例如，终端设备在与目标接入网设备 建立通信连接之后又移动至其他小区并接入了管理该其他小区的第三方接入网设备，其中，第三方接入网设备是指目标接入网设备、源接入网设备以外的接入网设备，终端设备可以向该第三方接入网设备发送该第一报告，由该第三方接入网设备接收到该第一报告后，向该第一报告的目标设备转发该第一报告，具体可以通过但不限于第一报告指示该第一报告的目标设备是目标接入网设备和/或源接入网设备。该第三方接入网设备向目标设备转发该第一报告，可以是由第三方接入网设备通过该第三方接入网设备与目标设备之间的通信接口将该第一报告转发给目标设备，或者，可以是由第三方接入网设备发送给其他网络设备，经过一个或多个网络设备的中继转发至目标设备，本申请对此不作限定。
在本申请中，小区重定向过程中存在潜在失败包括：虽然终端设备成功执行了小区重定向，但小区重定向过程涉及的一些参数值可能即将满足但还未满足小区重定向失败的条件，从而，终端设备确定小区重定过程存在潜在失败的风险。
可选地，在该小区重定向过程满足报告条件的情况下，终端设备记录第一报告。
一种实施方式中，网络设备向终端设备发送第一指示信息，该第一指示信息用于指示该报告条件。可选地，网络设备向终端设备发送的RRC消息中包括该第一指示信息。作为示例非限定，该RRC消息可以是RRC释放消息。
其中，报告条件包括但不限于以下条件1至条件4中的一种或多种条件：
条件1：第一计时器的运行时长小于或等于第一门限值，且大于或等于第二门限值，第一计时器的运行时长为终端设备接收到来自源接入网设备的RRC释放消息至终端设备向目标接入网设备发送随机接入前导码之间的时长。
上述条件1中的第一计时器用于判断终端设备是否成功选择到重定向的小区，终端设备在接收到来自源接入网设备的RRC释放消息后启动第一计时器，在终端设备向目标接入设备发送随机接入前导码后停止该第一计时器。若第一计时器的运行时长大于第一门限值，且终端设备未选择到能够接入网络的小区，终端设备认为小区重定向失败，终端设备可以尝试与源小区重新建立连接，或进入空闲状态。
当终端设备记录第一报告的报告条件包括该条件1时，若终端设备在第一计时器的运行时长小于或等于第一门限值的情况下，成功选择到重定向的该目标小区，但第一计时器的运行时长大于或等于第二门限值，终端设备可以认为在小区重定向过程中进行小区选择的时间较长，存在因终端设备选择小区失败而导致小区重定向失败的风险。因此，终端设备可以向网络记录第一报告，以通知网络终端设备的小区重定向过程存在潜在失败的情况。以便网络进行网络参数优化。
可选地，该第一报告还用于指示触发记录该第一报告的报告条件包括该条件1。
例如，该第一报告可以包括用于指示触发记录该第一报告的报告条件包括该条件1的指示信息，如该指示信息可以是该条件1的标识信息，以通知网络由条件1触发记录终端设备发送该第一报告，使得网络基于该第一报告可以确定终端设备在小区重定向过程中进行小区选择的时间较长可能存在潜在失败的情况，从而进行相应地网络参数优化。
可选地，该第一报告还用于指示该第一计时器的运行时长。
终端设备通过该第一报告告知网络第一计时器的运行时长，使得网络基于该第一计时器的运行时长可以确定终端设备在小区重定向过程中进行小区选择的时间较长可能存在潜在失败的情况，从而进行相应地网络参数优化。
或者，第一报告可以既指示报告条件1由指示第一计时器的运行时长，使得网络获取 到报告条件中包括条件1和第一计时器的运行时长后，确定终端设备在小区重定向过程中进行小区选择的时间较长可能存在潜在失败的情况，从而进行相应地网络参数优化。
条件2：第二计时器的运行时长小于或等于第三门限值，且大于或等于第四门限值，第二计时器的运行时长为终端设备接收到来自源接入网设备的RRC释放消息至终端设备接收到来自目标接入网设备的RRC连接建立消息之间的时长。
上述条件2中的第二计时器用于判断终端设备是否成功重定向至目标小区。终端设备在接收到来自源接入网设备的RRC释放消息后将启动第二计时器，在接收到来自目标接入网设备的RRC连接建立消息后停止该第二计时器。若第二计时器的运行时长大于第三门限值，终端设备仍未接收到RRC连接建立消息，则终端设备认为对目标小区的小区重定向失败，终端设备可以选择其他小区以接入网络。
当终端设备记录第一报告的报告条件可以包括该条件2时，若终端设备在第二计时器的运行时长小于或等于第三门限值的情况下，成功重定向至该目标小区，但第二计时器的运行时长大于或等于第四门限值，终端设备可以认为在小区重定向至目标小区的时间较长，存在重定向至目标小区的小区重定向过程中存在潜在失败的风险。因此，终端设备可以记录该第一报告，并向网络发送第一报告，以通知网络终端设备的小区重定向过程存在潜在失败的情况。以便网络进行网络参数优化。
可选地，该第一报告还用于指示触发记录该第一报告的报告条件包括该条件2和/或该第二计时器的运行时长。具体实施方式可以参考上述条件1中的描述，为了简要，在此不再赘述。
条件3：第三计时器的运行时长小于或等于第五门限值，且大于或等于第六门限值，第三计时器的运行时长为终端设备向目标接入网设备发送RRC连接请求消息至终端设备接收到来自目标接入网设备的RRC连接建立消息之间的时长。
上述条件3中的第三计时器用于判断终端设备在目标小区与网络的RRC连接是否成功建立。终端设备在向目标接入网设备发送的RRC连接请求消息后启动第三计时器，在接收到来自目标接入网设备的RRC连接建立消息后停止该第三计时器，若第三计时器的运行时长大于第五门限值，终端设备仍未接收到来自目标接入网设备的RRC连接建立消息，终端设备认为RRC连接建立失败，则终端设备进入空闲状态，或者终端设备尝试与源小区重新建立连接。
终端设备记录第一报告的报告条件可以包括该条件3，若终端设备在第三计时器的运行时长小于或等于第五门限值的情况下，终端设备在目标小区与网络的RRC连接成功建立，但第三计时器的运行时长大于或等于第六门限值，终端设备可以认为在目标小区建立RRC连接的时间较长，存在重定向至目标小区的小区重定向过程存在失败的风险。因此，终端设备可以记录该第一报告，并向网络发送第一报告，以通知网络终端设备的小区重定向过程存在潜在失败的情况。以便网络进行网络参数优化。
可选地，该第一报告还用于指示触发记录该第一报告的报告条件包括该条件3和/或该第三计时器的运行时长。具体实施方式可以参考上述条件1中的描述，为了简要，在此不再赘述。
上述第一门限值、第二门限值、第三门限值、第四门限值、第五门限值和第六门限值中的一项或多项可以是协议预定义的，或者可以是源接入网设备为终端设备配置的。例如，源接入网设备可以通过RRC释放消息通知终端设备上述第二门限值、第四门限值和第六 门限值中的一项或多项。
源接入网设备可以直接指示计时器的门限值的取值，或者可以预定义一个门限值的多个候选取值以及每个候选取值的标识信息，源接入网设备通过指示一个候选取值的标识信息，通知终端设备计时器的取值为该标识信息对应的候选取值。
例如，对于一个计时器，可以通过协议预定义或由网络设备预配置的方式定义该计时器的门限值的4个候选取值以及每个候选取值的标识信息，如该4个候选取值分别为T0、T1、T2、T3，候选取值的单位可以是微秒、毫秒或秒，其中，T0的标识信息为0，T1的标识信息为1、T2的标识信息为2、T3的标识信息为3。源接入网设备可以通过RRC消息，如该RRC消息可以是RRC释放消息，该RRC释放消息可以包括长度为2比特的指示，该指示用于指示该4个候选取值的一个候选取值的标识信息，例如，该指示指示标识信息为2，则终端设备接收到该RRC释放消息后，可以确定该计时器的门限值为标识信息2对应的候选取值T2。
在一个实施方式中，源接入网设备可以指示如下第一系数、第二系数或第三系数中的一项或多项，以通知终端设备相应门限值的取值。
可选地，该第二门限值为该第一门限值与第一系数的乘积，和/或，该第四门限值为该第三门限值与第二系数的乘积，和/或，该第六门限值为该第五门限值与第三系数的乘积，其中，该第一系数、该第二系数和该第三系数小于1。
第一门限值、第三门限值和第五门限值可以是由源接入网设备通知终端设备的，若报告条件包括条件1，则源接入网设备可以通知终端设备第一系数，终端设备根据第一门限值和第一系数，确定第二门限值的取值。类似地，若报告条件包括条件2，则源接入网设备可以通知终端设备第二系数。若报告条件包括条件3，则源接入网设备可以通知终端设备第三系数。
示例性地，上述门限值对应的系数可以是百分比，如报告条件包括条件1，则源接入网设备向终端设备发送的RRC消息，如该RRC消息可以是RRC释放消息，该RRC释放消息指示第一系数的取值为90％，则终端设备根据RRC释放消息中的该第一系数的取值，可以根据第一系数和第一门限值，确定第二门限值，即第二门限值为第一门限值的90％。源接入网设备可以采用类似的方式通知终端设备第四门限值、第六门限值对应的系数。但本申请不限于此，系数可以表示为小数或分数。
条件4：终端设备在第一频点执行小区重定向失败，且在第一频点以外的频点执行小区重定向成功，第一频点为源接入网设备为终端设备配置的用于小区重定向的候选频点，目标小区的频点为第一频点以外的频点。
终端设备记录第一报告的报告条件可以包括上述条件4，终端设备在源接入网设备为终端设备配置的候选频点执行小区重定向失败，在第一频点以外的频点小区重定向成功，则终端设备需要记录第一报告，终端设备可以向网络发送第一报告，以通知网络终端设备的小区重定向过程存在潜在失败的风险。
一种实施方式中，第一频点和目标小区的频点均为源接入网设备为终端设备配置的执行小区重定向的候选频点。也就是说，源接入网设备为终端设备配置了多个候选频点，该多个候选频点包括第一频点和目标小区的频点，终端设备在第一频点上执行小区重定向失败后，在另一个候选频点(即目标小区的频点)上执行小区重定向并成功重定向至目标小区。
另一种实施方式中，第一频点为源接入网设备为终端设备配置的执行小区重定向的候选频点。目标小区的频点可以是源接入网设备为终端设备配置的候选频点以外的频点。也就是说，源接入网设备为终端设备配置了候选频点包括第一频点，但不包括目标小区的频点。终端设备在候选频点上执行小区重定向失败后，在候选频点以外的频点上执行小区重定向，成功重定向至目标小区。
可选地，该第一报告还用于指示触发该第一报告的报告条件包括该条件4和/或该第一频点。
例如，第一报告可以包括用于指示报告条件包括条件4的指示信息，通知网络终端设备在网络配置的候选频点上发生过小区重定向失败的情况，以便网络进行网络参数优化。
再例如，第一报告可以包括用于指示报告条件包括第一频点的指示信息，以通知网络终端设备执行小区重定向失败的第一频点，以便网络能够获取到具体终端设备小区重定向失败的频点信息，有针对性地进行网络参数优化。
可选地，该第一报告还用于指示以下一项或多项：
源小区的标识信息、目标小区的标识信息、小区测量信息、重定向频点信息、目标小区的频点、用于指示是否存在合适小区的指示信息、用于指示是否有可接受小区的指示信息、第一计时器的运行时长、第二计时器的运行时长、第三计时器的运行时长、或第四计时器的运行时长。
其中，该小区测量信息包括该源小区的测量信息、目标小区的测量信息、源小区的邻小区的测量信息或目标小区的邻小区的测量信息的一种或多种。
例如，小区测量信息可以是小区的测量结果。可选地，小区测量信息还包括除源小区和目标小区以外的其他小区的测量信息。例如，终端设备在候选频点上执行小区信号质量测量，该小区测量信息可以包括终端设备测量到的小区的测量结果。再例如，终端设备在第一频点执行小区重建立失败，该小区测量信息可以包括终端设备测量该第一频点上的小区的测量结果。
第四计时器的运行时长是终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功建立业务通道之间的时长，或者，终端设备接收到来自源接入网设备的RRC释放消息至终端设备与目标接入网设备成功传输业务数据包之间的时长。终端设备在接收到来自源接入网设备的RRC释放消息后启动该第四计时器，终端设备由源小区重定向至目标小区，在终端设备与目标接入网设备成功建立业务通道、或终端设备与目标接入网设备成功传输业务数据包后，终端设备停止第四计时器，得到第四计时器的运行时长可以称为业务中断时长。
例如，源接入网设备通过RRC释放消息指示终端设备通过小区重定向的方式回落到4G网络中的小区以完成语音业务数据传输。终端设备接收到该RRC释放消息后启动该第四计时器，并执行小区重定向，终端设备成功重定向至目标小区，该目标小区是4G网络中的一个eNodeB管理的小区，即目标接入网设备是4G网络中的eNodeB。终端设备向该eNodeB发起跟踪区域(tracking area update，TAU)过程，跟踪区域是指为了确认终端设备的位置，LTE网络覆盖区域被分为多个跟踪区域，是LTE网络中终端设备的位置更新和寻呼的基本单位。终端设备与eNodeB完成TAU过程后，终端设备与eNodeB建立VoLTE业务通道，并在VoLTE业务通道建立成功后，终端设备停止第四计时器，该第四计时器的运行时长为语音业务中断时长，终端设备发送的第一报告中可以包括该第四计时 器的运行时长。以便网络能够获取到具体终端设备小区重定向过程中语音业务的中断时长，有针对性地进行网络参数优化。
可选地，终端设备发送第一报告，包括：终端设备向源接入网设备发送第一报告，该第一报告中包括源小区的标识信息，或者终端设备向目标接入网设备发送第一报告。可选地，作为第一报告的接收端，源接入网设备或者目标接入网设备可以通过其他网络设备接收第一报告，也就是说，终端设备向其他网络设备发送第一报告，再由其他网络设备转发发至源接入网设备或者目标接入网设备。此外，源接入网设备或者目标接入网设备还可以将接收到的第一报告再发送给其他网络设备。可以理解，对源接入网设备而言，目标接入网设备属于上述其他网络设备；对目标接入网设备而言，源接入网设备属于上述其他网络设备。
图4为本申请实施例提供的通信方法400的一个示意性流程图。如图4所示，终端设备向目标接入网设备发送第一报告，由目标接入网设备向源接入网设备转发该第一报告，源接入网设备根据第一报告调整网络配置参数。
S401，终端设备向目标接入网设备发送第一报告。
相应地，目标接入网设备接收来自终端设备的第一报告。
在图4所示实施例中，该第一报告为终端设备发送给源接入网设备的报告，而由于当前终端设备连接的接入网设备为目标接入网设备，则终端设备可以通过目标接入网设备将该第一报告转发给源接入网设备，例如目标接入网设备将该第一报告封装在容器(container)中发送给源接入网设备。该第一报告包括源小区的标识信息，该源小区的标识信息用于指示该第一报告为发送给源小区的接入网设备(即源接入网设备)的报告。目标接入网设备可以根据该第一报告中的源小区的标识信息，确定该第一报告为发送给源接入网设备的报告。
例如，当报告条件包括上述条件1、条件2或条件4中的一项或多项，且终端设备执行小区重定向的过程满足报告条件时，可能由于源小区的候选频点配置不合理导致的小区重定向过程存在潜在失败的情况，则终端设备记录第一报告，并向源接入网设备发送第一报告，以便源接入网设备可以参考第一报告，判断是否对候选频点进行优化，减小网络中的终端设备发生小区重定向失败的概率。该第一报告包括源小区的标识信息。目标接入网设备可以根据该第一报告中的源小区的标识信息，确定该第一报告为发送给源接入网设备的报告。目标接入网设备将该第一报告透传给源接入网设备，即目标接入设备确定该第一报告的目标设备为源接入网设备后，不解析该第一报告的内容，将该第一报告转发给源接入网设备。
该示例中由终端设备基于触发终端设备记录第一报告的报告条件，确定该第一报告是发送给源接入网设备的第一报告，但本申请不限于此，终端设备可以不作此判断，当小区重定向过程满足报告条件时终端设备记录第一报告，并向源接入网设备发送第一报告，由源接入网设备分析终端设备的小区重定向过程存在潜在失败风险的原因(可以参考S403中的相关描述)。
S402，目标接入网设备向源接入设备发送第一报告。
相应地，源接入网设备接收来自目标接入网设备的该第一报告。
S403，源接入网设备根据该第一报告，调整网络配置参数。
源接入网设备根据第一报告，可以确定终端设备由源小区执行小区重定向成功，但存 在潜在失败的情况，源接入网设备可以基于第一报告调整网络参数配置。可选地，由源小区执行小区重定向到其他小区的多个终端设备，在其执行的小区重定向过程满足报告条件的情况下，终端设备记录第一报告，并向源接入网设备发送第一报告，源接入网设备收集第一报告，若源接入网设备接收到一定数量(如预设数量)的终端设备发送第一报告指示小区重定向过程中存在潜在失败的风险，源接入网设备可以基于多个终端设备的第一报告，进行网络参数优化，以期减小重定向失败的概率。例如，源接入网设备基于来自多个终端设备的第一报告优化候选频点配置。比如，多个终端设备发送的第一报告包括相应的终端设备由该源小区执行小区重定向成功接入的小区的频点信息，源接入网设备可以参考来自多个终端设备的第一报告指示的终端设备成功完成小区重定向的频点，配置源小区中的终端设备执行小区重定向的候选频点，但本申请不限于此。源接入网设备还可以基于第一报告中的其他信息调整其他网络参数配置。
如前文描述，在一种实施方式中，终端设备不判断小区重定向过程存在潜在失败的原因，当小区重定向过程满足报告条件时，终端设备记录第一报告，并向源接入网设备发送第一报告，由源接入网设备分析终端设备的小区重定向过程存在潜在失败的原因。若源接入网设备分析终端设备的小区重定向过程存在潜在失败的原因是由源接入网设备的参数配置不合理导致的，则源接入网设备可以参考该第一报告进行网络参数优化。若源接入网设备分析终端设备的小区重定向过程存在潜在失败的原因可能是由目标接入网设备的参数配置不合理导致的，源接入网设备可以通知目标接入网设备。在该实施方式中，当终端设备确定小区重定向过程存在潜在失败风险时，终端设备即向指示该终端设备执行小区重定向的源接入网设备发送第一报告，该第一报告可以不包括源接入网设备为终端设备配置的小区重定向的相关信息(如候选频点信息等)，由源接入网设备基于该第一报告并结合之前为终端设备提供的小区重定向相关的配置信息，分析存在潜在失败风险的原因，能够在减小第一报告的信息开销的情况下，提高网络优化的准确度。
可选地，源接入网设备向目标接入网设备发送第一消息，该第一消息包括第一报告中与目标接入网设备相关的信息。
源接入网设备接收到该第一报告后，分析该第一报告中的信息，确定终端设备的小区重定向过程存在的潜在失败风险的问题与目标接入网设备相关，则源接入网设备将第一报告中与目标接入网设备相关的信息转发给目标接入网设备。
例如，第一报告指示了终端设备的小区重定向过程满足报告条件1和条件2，说明终端设备虽然成功重定向至目标小区，但终端设备接收到来自源接入网设备的RRC释放消息至向目标接入网设备发送随机接入前导码之间的时间较长(即第一计时器的运行时长小于或等于第一门限值，且大于或等于第二门限值)，并且终端设备接收到来自源接入网设备的RRC释放消息至接收到来自目标接入网设备的RRC连接建立消息之间的时间较长(即第二计时器的运行时长小于或等于第三门限值，且大于或等于第四门限值)，小区重定向过程存在潜在失败的风险。源接入网设备基于终端设备的小区重定向过程既满足报告条件1又满足报告条件2，判断小区重定向过程存在潜在失败风险的原因可能既与源接入网的配置有关又与目标接入网设备的配置有关。例如，小区重定向过程存在潜在失败的风险可能与目标小区的随机接入过程的资源配置(如前导码、时频资源等)有关，源接入网设备向目标接入网设备发送第一消息，该第一消息可以指示终端设备的小区重定向过程满足报告条件1和条件2，可选地，第一消息还包括第一报告中的其他信息，如第一计时器 和/或第二计时器的运行时长，以便目标接入网设备参考第一消息，进行网络参数优化。但本申请不限于此，若源接入网设备分析第一报告后判断终端设备的小区重定向过程存在潜在失败的风险与目标接入网设备无关，则源接入网设备可以不向目标接入网设备发送第一消息。
图5为本申请实施例提供的通信方法500的一个示意性流程图。
S501，终端设备向目标接入网设备发送第一报告。
相应地，目标接入网设备接收来自终端设备的该第一报告。
在图5所示实施例中，该第一报告为终端设备发送给目标接入网设备的报告，即该第一报告的目标设备为该目标接入网设备。终端设备向目标接入网设备发送第一报告可以是终端设备与目标接入网设备建立无线通信连接时，由终端设备发送第一报告，且由目标接入网设备在无线信道中接收该第一报告。或者，终端设备向目标接入网设备发送第一报告可以是终端设备已由该目标小区移动至其他小区，终端设备向建立通信连接的第三方接入网设备发送该第一报告，由该第三方接入网设备向目标接入网设备转发该第一报告。本申请对不作限定。
例如，当报告条件包括上述条件3，且终端设备执行小区重定向的过程满足报告条件3时，可能由于目标小区的网络接入配置不合理(如随机接入信道参数配置不合理等)导致终端设备重定向至目标小区的小区重定向过程存在潜在失败的风险，则终端设备记录第一报告，并且可以向目标接入网设备发送该第一报告，以便目标接入网设备可以参考第一报告，判断是否对网络配置参数进行优化，减小网络中的终端设备发生小区重定向失败概率。
S502，目标接入网设备根据第一报告，调整网络配置参数。
目标接入网设备根据第一报告，可以确定终端设备成功执行小区重定向至目标小区，但存在潜在失败的情况，目标接入网设备可以基于第一报告调整网络配置参数。执行小区重定向至目标小区的终端设备在小区重定向过程满足报告条件的情况下，终端设备记录第一报告，并向目标接入网设备发送第一报告，目标接入网设备收集第一报告，若目标接入网设备接收到一定数量(如预设数量)的终端设备发送第一报告指示小区重定向过程中存在潜在失败的风险，则目标接入网设备可以调整网络接入参数配置，如随机接入信道(random access channel，RACH)等配置。但本申请不限于此。可选地，终端设备的小区重定向过程存在潜在失败风险，可能是目标接入网(即目标接入网设备所在的网络)的参数配置不合理导致的，也可能是源接入网(即源接入网设备所在的网络)的参数配置不合理导致的，该第一报告可以既是发送给目标接入网设备的又是发送给源接入网设备的。目标接入网设备接收到第一报告后，可以既参考第一报告进行网络参数优化，又将第一报告转发给源接入网设备，源接入网设备接收到该第一报告，也可以参考第一报告进行网络参数优化。或者，目标接入网设备接收到第一报告后，可以将第一报告中用于源网络设备优化网络参数的信息发送给源接入网设备。
该示例中由终端设备基于触发终端设备记录第一报告的报告条件，判断第一报告是发送给源接入网设备还是发送给目标接入网设备还是源接入网设备与目标接入网设备都需要该第一报告。但本申请不限于此，终端设备可以不作此判断，当满足报告条件时终端设备记录第一报告，并且向目标接入网设备发送第一报告，该第一报告包括源小区的标识信息，由目标接入网设备基于第一报告判断是否需要将第一报告或第一报告中的部分信息转 发给源接入网设备，以便源接入网设备进行网络参数优化。
例如，该第一报告包括指示报告条件包括条件1和条件3的信息，以及第一计时器的运行时长的运行时长、第三计时器的运行时长、小区测量信息、目标小区的频点，目标接入网设备接收到该第一报告后，基于报告条件包括条件3，可以确定可能存在目标接入网的参数配置不合理的情况，可以参考第一报告(如第三计时器的运行时长、小区测量信息中的目标小区的测量结果等)进行网络参数配置。目标接入网设备基于报告条件确定源接入网的参数可能存在配置不合理的情况，目标接入网设备可以向源接入网设备发送接口消息，指示终端设备的小区重定向过程存在潜在失败的风险，该接口消息可以包括第一计时器的运行时长、小区测量信息、目标小区的频点信息，以便源接入网设备可以参考该接口消息，判断是否进行网络参数优化。
可选地，该第一报告还包括第二指示信息，该第二指示信息用于指示该小区重定向是由业务触发的或由测量结果触发的。
作为示例非限定，该小区重定向可以是由语音业务触发的。例如，源接入网设备所在的网络不支持VoNR业务或VoNR业务质量下降，源接入网设备可以指示终端设备执行小区重定向，若终端设备因满足报告条件记录第一报告，该第一报告中包括该第二指示信息，该第二指示信息指示该小区重定向是由语音业务触发的。或者，源接入网设备基于终端设备上报的小区测量结果，指示终端设备执行小区重定向，若终端设备发送第一报告，则该第一报告中的第二指示信息指示该小区重定向为小区测量结果触发的。通过第一报告包括第二指示信息，使得获取该第一报告的网络设备(如源接入网设备和/或目标接入网设备)可以判断触发终端设备执行小区重定向的原因。比如，小区重定向由语音业务触发时，该网络设备基于第二指示信息可以确定不是服务小区的信号质量下降或邻小区信号质量高于服务小区服务信号质量导致的，可以不参考第一报告调整测量配置相关的网络参数，而仅调整小区重定向配置的相关参数，能够提高网络参数优化的精度，减小不必要的或错误的网络参数优化。
以上，示例性地介绍了本申请提出的在终端设备由源小区重定向至目标小区的重定向过程中存在潜在失败的风险时，终端设备可以向网络设备发送第一报告，以通知网络设备终端设备的小区重定向过程存在潜在失败的风险，以便网络设备可以参考第一报告进行网络参数优化，提高网络设备对终端设备的移动性管理的性能。目前，终端设备的切换失败报告也可以作为网络设备进行网络参数优化的参考。但由于终端设备执行小区切换可能是由基于信号覆盖质量原因触发的或者是由业务数据触发的，不同触发原因的小区切换失败使得网络设备进行网络优化的方向可能不同，因此，存在基于切换失败报告进行网络参数优化的准确性不高的问题。本申请实施例提出终端设备通知网络设备小区切换失败时，需要通知网络设备触发终端设备执行小区切换的原因，使得网络设备可以更精准地执行网络参数优化。下面结合图6进行说明。
图6是本申请实施例提供的通信方法的另一个示意性流程图。
S601，终端设备向第一小区切换失败。
例如，终端设备在源小区接收到切换命令，该切换命令用于指示终端设备切换至第一小区。终端设备执行小区切换，但终端设备未成功切换至第一小区。终端设备尝试与其他小区建立通信连接。
S602，终端设备与第二小区建立通信连接。
一种实施方式中，该第二小区与第一小区的RAT相同。
例如，终端设备由源小区执行异制式网络的(或称为异***)小区切换，源接入网设备指示终端设备切换至与源小区RAT不同的第一小区。如源小区为5G网络中的一个小区，采用的是NR接入技术，第一小区为4G网络中的一个小区，采用的是E-UTRA技术，反之亦然，本申请对此不作限定。终端设备向第一小区切换失败，则终端设备继续在第一小区所在网络的候选频点上执行小区选择，以接入与第一小区RAT相同的其他小区。各个网络中的候选频点可以是由协议预定义的，如4G网络中的小区的候选频点、5G网络中的小区的候选频点均为协议预定义的。若终端设备成功选择到合适的小区(如满足信号质量需求的小区)，即终端设备成功选择到与第一小区RAT相同的第二小区，终端设备在第二小区与管理第二小区的接入网设备建立通信连接。因此，第二小区与第一小区的RAT相同。
另一种实施方式中，该第二小区与第一小区的RAT不同。
再例如，源接入网设备指示终端设备切换至与源小区RAT不同的第一小区。终端设备向第一小区切换失败，则终端设备继续在第一小区所在网络的频点上执行小区选择，但终端设备未选择到与第一小区RAT相同的合适的小区。终端设备与源小区重新建立连接，该示例中第二小区为终端设备的源小区，第二小区与第一小区的RAT不同。但本申请不限于此，第二小区也可以是其他与第一小区不同RAT的小区。
S603，终端设备向管理第二小区的第一接入网设备发送第二报告，该第二报告用于指示终端设备向第一小区切换失败，第二报告包括第四指示信息，该第四指示信息用于指示所述终端设备向所述第一小区切换是由语音业务触发的，或者是由测量结果触发的。
相应地，第一接入网设备接收来自终端设备的该第二报告，并根据第二报告中的第四指示信息确定触发终端设备向第一小区切换的触发原因。
作为示例非限定，该第二报告为RLF报告或者连接建立失败报告。
例如，第四指示信息指示终端设备向第一小区切换是由信号覆盖质量触发的，则第一接入网设备可以判断可能是由于源小区的测量参数和/或基于测量的切换参数配置不合理导致的切换失败，如可能是源小区的测量上报的门限值等参数配置不合理，但本申请不限于此。第一接入网设备可以向源接入网设备发送第二消息，该第二消息用于指示终端设备由源小区切换至第一小区，该第二消息可以包括该第二报告或第二报告中的部分信息，源接入网设备可以参考该第二消息进行网络参数优化，如网络参数优化包括但不限于调整测量配置参数和/或基于测量的切换参数等。可选地，终端设备向第一小区切换失败也可能是第一小区的网络参数配置不合理导致的，如随机接入过程的相关参数等。第一接入网设备可以向管理第一小区的接入网设备发送该第二报告或该第二报告中的部分信息，以便管理第一小区的接入网设备作为网络参数优化的参考信息。
再例如，第四指示信息指示终端设备向第一小区切换是由语音业务触发的，则第一接入网设备可以确定由语音业务触发终端设备切换至第一小区，而不是由信号覆盖质量触发的，因此第一接入网设备可以确定终端设备向第一小区切换失败并不是因源小区的测量参数和/或基于测量的切换参数配置不合理导致的。第一接入网设备可以不向源接入网设备发送第二报告。可选地，第一接入网设备向管理第一小区的接入网设备发送该第二报告或该第二报告中的部分信息。
可选地，该第二报告还包括第五指示信息，该第五指示信息用于指示终端设备是否选 择到满足条件的小区，或者指示是否选择到合适小区。
例如，终端设备未选择到与第一小区RAT相同的小区，终端设备与源小区重新建立连接，即第二小区为终端设备进行小区切换前的源小区，该第二报告包括第五指示信息，该第五指示信息指示未选择到满足条件的小区，以通知网络终端设备未选择到与第一小区RAT相同的小区。能够为网络提供小区切换过程相关的详细信息，为网络设备进行网络参数优化时提供参考，提高网络设备对终端设备的移动性管理的效果。示例性地，该第五指示信息可以记作noSuitableCellFound，当该noSuitableCellFound为“真(True)”时表示终端设备未选择到满足合适小区条件的小区。
再例如，终端设备向第一小区切换失败后，选择到与第一小区RAT相同的小区，即第二小区，该第二报告包括第五指示信息，该第五指示信息指示选择到满足条件的小区，以通知网络终端设备在向第一小区切换失败后选择到与第一小区RAT相同的小区。能够为网络提供小区切换过程相关的详细信息，为网络设备(如源接入网设备和/或管理第一小区的接入网设备)进行网络参数优化时提供参考，提高网络设备对终端设备的移动性管理的效果。
以上结合图6介绍了终端设备发生小区切换失败后，当再次与网络建立通信连接，终端设备向连接的接入网设备发送第二报告，该第二报告中包括指示触发小区切换的触发原因的指示信息，以便网络能够基于切换触发原因，更准确地调整不合理的参数配置，减小不必要或错误的网络参数调整，从而提高网络设备对终端设的移动性管理的效果。
当网络设备因终端设备的语音业务指示终端设备切换至异制式网络的一个小区(如第一小区)时，基于目前切换机制，若终端设备执行小区切换失败，则终端设备将在第一小区所属制式的网络的候选频点上执行小区选择，选择一个满足条件的小区接入。如果是普通语音业务，满足条件指的是合适小区的条件；如果是紧急语音业务，满足条件指的是合适小区和可接受小区的条件，终端设备首先选择合适小区，如果没有选择到合适小区则选择可接受的小区。本申请实施例提出若终端设备因语音业务触发执行小区切换但切换失败，且执行小区选择未选择到满足条件的小区，终端设备可以与源小区的接入网设备重新建立连接。下面结合图7进行说明。
图7是本申请实施例提供的通信方法的另一个示意性流程图。
S701，第二接入网设备向终端设备发送切换命令，该切换命令用于指示语音业务触发终端设备切换至第一小区。
例如，终端设备的服务小区(即源小区)为NR小区，该NR小区所在的5G网络不支持VoNR策略，无法为终端设备提供语音业务服务。当终端设备存在待发送的语音业务数据或待接收的语音业务数据时，管理源小区的第二接入网设备向终端设备发送切换命令，该切换命令指示语音业务触发终端设备切换至4G网络的第一小区。也就是说，第二接入网设备通过切换命令指示终端设备通过小区切换过程回落至4G网络中的小区进行语音业务数据传输。终端设备接收到该切换命令后，执行向第一小区切换的小区切换过程。
可选地，该第一小区与源小区的RAT不同
S702，终端设备向第一小区切换失败。
该第一小区为第三接入网设备管理的小区，终端设备向第一小区执行随机接入过程，尝试切换至第一小区，但终端设备未成功切换至第一小区。
S703，终端设备执行小区选择，未选择到满足条件的小区。
终端设备在向第一小区执行小区切换失败后，终端设备执行小区选择，以接入与第一小区RAT相同的小区，但终端设备未选择到满足条件的小区。
如果是普通语音业务，满足条件指的是合适小区(suitable cell)的条件；如果是紧急语音业务，满足条件指的是合适小区和可接受小区(acceptable cell)的条件。比如紧急语音业务场景下，终端设备首先尝试选择合适小区，如果没有选择到合适小区，终端设备可以选择可接受的小区。
例如，终端设备在第一小区所在的E-UTRA频点或者在其他E-UTRA频点选择到满足条件的小区，以接入与第一小区RAT相同的小区。如终端设备在一个或多个E-UTRA频点上检测同步信号，在检测到一个小区的同步信号的情况下执行信号质量测量，若该小区的测量结果满足接入条件，则终端设备在该小区执行随机接入过程。
若终端设备一个或多个E-UTRA频点上未选择到满足条件的小区，终端设备执行S704。比如，可以由协议预定义或网络预配置终端设备在向切换的目标小区切换失败后，在与目标小区相同RAT的小区所在的候选频点上执行小区选择，若终端设备向第一小区切换失败后的预设时长内未选择到满足条件的小区，终端设备确定未选择到满足条件的小区，或者，若终端设备在目标小区相同RAT的小区所在的候选频点上未选择到满足条件的小区，终端设备执行S704。
S704，终端设备与源小区执行RRC重建过程。
终端设备因语音业务触发向第一小区切换，而并非覆盖指示源小区的信号质量下降或第一小区的信号质量高于源小区的信号质量触发的小区切换，源小区的信号质量仍满足通信需求，因此终端设备可以与源小区重新建立RRC连接以便恢复与网络之间的通信。
S705，终端设备向第二接入网设备发送第三报告，该第三报告用于指示终端设备向第一小区切换失败。
该第二接入网设备是管理源小区的源接入网设备。相应地，第二接入网设备接收来自终端设备的第三报告。
可选地，该第三报告可以包括上述图6所示实施例中的第五指示信息，该第五指示信息用于指示终端设备未选择到满足条件的小区。在正常(普通)语音业务场景下，若终端设备未选择到合适的小区，该第五指示信息可以指示正常语音业务场景下终端未选择到合适小区；或者，在紧急语音业务场景下，若终端设备未选择到合适小区，选择一个可接受的小区，该第五指示信息也可以用于指示紧急语音业务回落场景下终端设备未选择到合适小区，或者未选择到可接受的小区。
例如，该第五指示信息可以记作noSuitableCellFound，当该noSuitableCellFound为“真(True)”时表示终端设备未选择到满足条件的小区。
可选地，该第三报告还可以包括上述图6所示实施例中的第四指示信息，该第四指示信息用于指示该小区切换是由语音业务触发的。该第二接入网设备接收到该第三报告后可以基于第五指示信息和第四指示信息，确定终端设备因语音业务触发小区切换导致终端设备长时间在E-UTRA频点(即LTE频点)下未选择到满足条件的小区，以便第二接入网设备能够参考第三报告进行网络参数优化，调整网络配置参数。
再例如，第三报告可以不包括第四指示信息，由于该终端设备的小区切换时由第二接入网设备(即源接入网设备)指示的，因此，该第二接入网设备在终端设备重新接入源小区后，基于终端设备的标识信息可以确定终端设备的小区切换时由语音业务触发的，且基 于第三报告确定终端设备执行小区切换失败，第二接入网设备可以参考能够参考第三报告进行网络参数优化，如调整语音业务触发的切换参数配置等，本申请对此不作限定。
根据图7所示实施例提供的方案，若终端设备执行小区切换失败，且执行小区选择未选择到满足条件的小区，终端设备可以与源小区的接入网设备重新建立连接，由于该小区切换并不是因为源接入网设备在源小区的信号质量下降导致的，因此，源接入网设备在源小区的信号质量能够满足终端设备的通信需求，能够减少因语音业务回落导致终端设备长时间在E-UTRA频点上进行小区选择或与网络断开通信连接的情况出现。
作为一种可能的实现方式，若终端设备执行小区选择，并且选择到满足条件的E-UTRA小区，终端设备在该小区发起连接建立流程。可选地，终端设备在第三报告中记录一个指示信息，该指示信息用于指示终端设备接入的E-UTRA小区是否为可接受的小区，或者，该指示信息用于指示回落的语音业务类型为普通(正常)语音业务或紧急语音业务。在紧急语音业务回落场景下，若终端设备未选择到合适小区，选择到可接受的小区，终端设备在第三报告中还记录一个指示信息，该指示信息可以用于指示紧急语音业务回落场景下终端设备未选择到合适小区，或者未选择到合适的E-UTRA小区(E-UTRA小区还可以称为4G小区)。
当网络设备因终端设备的语音业务指示终端设备执行小区重定向时，若终端设备执行小区重定向失败，则终端设备将执行小区选择，选择一个满足条件的小区接入。若没有选择到满足条件的小区则终端设备可以与源小区的接入网设备重新建立连接。下面结合图7A对本申请实施例提供的方法1100进行说明。
S1101，第二接入网设备向终端设备发送RRC释放消息，该RRC释放消息用于指示语音业务触发终端设备执行重定向。
相应地，终端设备接收来自第二接入网设备的该RRC释放消息，确定因语音业务触发执行重定向。该RRC释放消息可以包括执行重定向的重定向频点。
S1102，终端设备执行重定向，且在重定向频点未选择到满足条件的小区。
终端设备记录第五报告，该第五报告用于指示终端设备执行重定向失败。
一种实施方式中，该第五报告还包括用于指示该重定向过程的重定向频点。
S1103，终端设备在E-UTRA频点执行小区选择，仍未选择到满足条件的小区。
终端设备在执行重定向且在在重定向频点未选择到满足条件的小区的情况下，终端设备在重定向频点以外的其他E-UTRA频点上执行小区选择，未选择到满足条件的小区。
在该图7A所示实施例中S1103，可以参考前文对图7所示实施例中S703中的描述，为了简要在此不再赘述。
S1104，终端设备在E-UTRA频点以外的频点执行小区选择，选择到合适小区建立RRC连接。
在S1103中，终端设备在重定向频点以外的其他E-UTRA频点上执行小区选择，仍未选择到满足条件的小区，则终端设备在S1104中再次执行小区选择，本次小区选择可以在E-UTRA以外的频点上，由终端设备在可能选择到合适小区的频点上执行小区选择，如终端设备可以在NR频点上执行小区选择，选择到能够作为合适小区的NR小区，与该NR小区建立RRC连接。
S1105，终端设备向第二接入网设备发送第五报告，该第五报告用于指示终端设备执行重定向失败。
一种可选实施方式中，该第五报告可以包括上述图7所示实施例中的第五指示信息，该第五指示信息用于指示终端设备未选择到满足条件的小区。
一种可选实施方式中，该第五报告可以包括用于指示该重定向是由语音业务触发的指示信息。该第二接入网设备接收到该第五报告后，可以确定终端设备因语音业务触发重定向导致终端设备长时间在重定向频点下以及其他E-UTRA频点上未选择到满足条件的小区，使得第二接入网设备能够参考第五报告进行网络参数优化，调整网络配置参数。
当网络设备因终端设备的语音业务指示终端设备切换至异制式网络的第一小区时，若终端设备成功切换至第一小区但存在潜在失败的风险，则终端设备可以记录第四报告，该第四报告可以是成功切换报告(successful handover report，SHR)或者随机接入报告，终端设备记录成功切换过程中具有潜在失败问题的相关信息。本申请实施例提出该第四报告中可以包括业务中断时长，以便切换过程相关的接入网设备(如源接入网设备和/或目标接入网设备)能够参考第四报告中的该业务中断时长和终端设备的上下文，进行网络配置参数优化，从而减小终端设备切换失败的概率，下面结合图7B对本申请实施例提供的通信方法1200进行说明。
S1201，源接入网设备向终端设备发送切换命令，该切换命令用于指示语音业务触发终端设备切换至第一小区。
具体可以参考前文S701中的描述，不再赘述。可选地，该第一小区与源小区的RAT不同。终端设备接收到切换命令后，启动第五计时器，并执行小区切换。
可选地，源网络设备向终端设备发送第一配置信息，该第一配置信息用于配置触发记录第四报告的触发条件。该触发条件可以包括以下一种或多种条件：
计时器运行时长大于或等于第七门限值；
计时器运行时长与计时器的最大运行时长的比值大于或等于第八门限值；
终端设备尝试接入目标接入网设备的随机接入次数大于或等于第九门限值；
终端设备与接入网设备(包括源接入网设备和/或目标接入网设备)之间的数据传输中断时间大于或等于第十门限值。
该第一配置信息可以包括上述第七门限值、第八门限值、第九门限值或第十门限值中的一项或多项。
一种实施方式中，该触发条件是由源接入网设备确定的，源接入网设备向终端设备发送该第一配置信息，向终端设备通知该触发条件。
另一种实施方式中，该触发条件是由目标接入网设备确定的，目标接入网设备向源接入网设备发送第一配置信息，由源接入网设备向终端设备转发该第一配置信息，以通过第一配置信息通知终端设备该触发条件。
S1202，终端设备成功切换至目标接入网管理的第一小区。
终端设备根据该切换命令执行小区切换，成功切换至目标接入网设备管理的第一小区。终端设备成功切换至目标接入网设备后可以发起TAU更新过程，与目标接入网设备完成TAU更新。
示例性地，该目标接入网设备可以是LTE网络中的eNodeB。
S1103，终端设备与目标接入网设备建立语音业务通道。
终端设备停止第五计时器，则第五计时器的运行时长为终端设备接收到切换命令至成 功建立语音业务通道之间的时长，即语音业务中断时长。或者，该第五计时器的运行时长为终端设备接收到切换命令至终端设备与目标接入网设备成功传输传输业务数据包之间的时长。
S1104，终端设备向源接入网设备发送第四报告，该第四报告包括第五计时器的运行时长。
终端设备记录第四报告的触发条件被满足，终端设备记录了第四报告。比如，终端设备成功完成与第一小区之间的随机接入流程，且记录第四报告的触发条件被满足，终端设备记录第四报告。
可选地，第四报告中包括第三指示信息，该第三指示信息用于指示终端设备执行小区切换的触发原因为语音业务回落。或者，该第三指示信息用于指示终端设备执行小区切换的切换触发原因为普通(正常)语音业务回落或紧急语音业务回落。
在本实施例中，终端设备确定由源小区切换至第一小区的切换过程中存在潜在切换失败的风险，则终端设备记录第四报告。该第四报告中包括第五计时器的运行时长，以便切换过程相关的接入网设备(如源接入网设备和/或目标接入网设备)能够参考第四报告中的该业务中断时长和终端设备的上下文，进行网络配置参数优化，如降低切换门限值等。以减小终端设备切换失败和/或业务中断时间过程的概率。在本申请实施例中，终端设备向一个接入网设备发送报告(如第一报告至第五报告中的一种或多种报告)，如终端设备接入网设备A发送报告。
若该报告的目标设备是源接入网设备，即该报告需要发送至源接入网设备，且接入网设备A和源接入网设备为不同的网络设备，接入网设备A发送上述报告的部分或全部信息给源接入网设备。可选地，接入网设备A还可以向源接入网设备发送报告的类型信息。报告的类型可以为5G(比如NR或者gNB)制式的报告类型，连接5G核心网的4G(比如eLTE或者ng-eNB)制式的报告类型，连接4G核心网的4G(比如LTE或者eNB)制式的报告类型或者其他制式的报告类型。一种实施方式中，若接入网设备A和源接入网设备间存在可以直接进行通信的接口，则接入网设备A通过接入网之间的接口(如基站和基站间的接口)向源接入网设备发送该报告的部分或全部信息。示例性地，接入网设备A和源接入网设备间的接口可以是X2接口或Xn接口。接入网设备A可以通过失败指示(FAILURE INDICATION)、无线链路失败制式(RLF INDICATION)消息、切换报告(HANDOVER REPORT)消息、接入和移动指示(ACCESS AND MOBILITY INDICATION)消息或其它消息向源接入网设备发送报告的部分或全部信息。
另一种实施方式中，若接入网设备A和源接入网设备间无法直接进行通信，则接入网设备A可以通过核心网设备向源接入网设备发送该报告的部分或全部信息。可选地，接入网设备A还可以向源接入网设备发送该报告的类型信息。接入网设备A可以通过接入网设备与核心网设备之间的接口向核心网设备发送该报告的部分或全部信息。示例性地，接入网设备A通过S1接口或NG接口向核心网设备发送该报告的部分或全部信息，由核心网设备向源接入网设备转发从接入网设备A接收到的信息。接入网设备A可以通过S1接口/NG接口上的以下至少一种消息向源接入网设备发送报告的部分或全部信息：
上行RAN配置传输(UPLINK RAN CONFIGURATION TRANSFER)消息、下行RAN配置传输(DOWNLIKN RAN CONFIGURATION TRANSFER)消息、基站配置传输(eNB CONFIGURATION TRANSFER)消息、核心网设备配置传输(MME CONFIGURATION  TRANSFER)消息或其它消息。
若该报告的目标设备是目标接入网设备，即该报告需要发送至目标接入网设备，且接入网设备A和目标接入网设备为不同的网络设备，接入网设备A发送上述报告的部分或全部信息给目标接入网设备，具体的发送方式可以参考接入网设备A向源接入网设备发送报告的方式为了简要在此不再赘述。
以上，结合图2至图7以及图7A、图7B详细说明了本公开提供的方法。以下附图说明本公开提供的通信装置和通信设备。为了实现上述本公开提供的方法中的各功能，各网元可以包括硬件结构和/或软件模块，以硬件结构、软件模块、或硬件结构加软件模块的形式来实现上述各功能。上述各功能中的某个功能以硬件结构、软件模块、还是硬件结构加软件模块的方式来执行，取决于技术方案的特定应用和设计约束条件。
图8是本公开提供的通信装置的示意性框图。如图8所示，该通信装置800可以包括收发单元820。
在一种可能的设计中，该通信装置800可对应于上文方法中的终端设备，或者配置于(或用于)终端设备中的芯片，或者其他能够实现终端设备的方法的装置、模块、电路或单元等。
应理解，该通信装置800可以包括用于执行图2至图7以及图7A、图7B所示的方法中终端设备执行的方法的单元。并且，该通信装置800中的各单元和上述其他操作和/或功能分别为了实现图2至图7以及图7A、图7B所示的方法的相应流程。
可选地，通信装置800还可以包括处理单元810，该处理单元810可以用于处理指令或者数据，以实现相应的操作。
还应理解，该通信装置800为配置于(或用于)终端设备中的芯片时，该通信装置800中的收发单元820可以为芯片的输入/输出接口或电路，该通信装置800中的处理单元810可以为芯片中的处理器。
可选地，通信装置800还可以包括存储单元830，该存储单元830可以用于存储指令或者数据，处理单元810可以执行该存储单元中存储的指令或者数据，以使该通信装置实现相应的操作。
应理解，该通信装置800中的收发单元820为可通过通信接口(如收发器或输入/输出接口)实现，例如可对应于图9中示出的终端设备900中的收发器910。该通信装置800中的处理单元810可通过至少一个处理器实现，例如可对应于图9中示出的终端设备900中的处理器920。该通信装置800中的处理单元810还可以通过至少一个逻辑电路实现。该通信装置800中的存储单元830可对应于图9中示出的终端设备900中的存储器。
还应理解，各单元执行上述相应步骤的具体过程在上述方法中已经详细说明，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800可对应于上文方法中的接入网设备，例如，或者配置于(或用于)接入网设备中的芯片，或者其他能够实现接入网设备的方法的装置、模块、电路或单元等。
应理解，该通信装置800可以包括用于执行图2至图7以及图7A、图7B所示的方法中接入网设备执行的方法的单元。并且，该通信装置800中的各单元和上述其他操作和/或功能分别为了实现图2至图7以及图7A、图7B所示的方法的相应流程。
可选地，通信装置800还可以包括处理单元810，该处理单元810可以用于处理指令 或者数据，以实现相应的操作。
还应理解，该通信装置800为配置于(或用于)接入网设备中的芯片时，该通信装置800中的收发单元820可以为芯片的输入/输出接口或电路，该通信装置800中的处理单元810可以为芯片中的处理器。
可选地，通信装置800还可以包括存储单元830，该存储单元830可以用于存储指令或者数据，处理单元810可以执行该存储单元中存储的指令或者数据，以使该通信装置实现相应的操作。
应理解，该通信装置800为接入网设备时，该通信装置800中的收发单元820为可通过通信接口(如收发器或输入/输出接口)实现，例如可对应于图10中示出的网络设备1000中的收发器1010。该通信装置1000中的处理单元1010可通过至少一个处理器实现，例如可对应于图10中示出的网络设备1000中的处理器1020，该通信装置800中的处理单元810可通过至少一个逻辑电路实现。该通信装置800中的存储单元830可对应于图10中示出的网络设备1000中的存储器。
还应理解，各单元执行上述相应步骤的具体过程在上述方法中已经详细说明，为了简洁，在此不再赘述。
图9是本公开提供的终端设备900的结构示意图。该终端设备900可应用于如图1所示的***中，执行上述方法中终端设备的功能。如图所示，该终端设备900包括处理器920和收发器910。可选地，该终端设备900还包括存储器。其中，处理器920、收发器910和存储器之间可以通过内部连接通路互相通信，传递控制信号和/或数据信号。该存储器用于存储计算机程序，该处理器920用于执行该存储器中的该计算机程序，以控制该收发器910收发信号。
上述处理器920可以用于执行前面方法中描述的由终端设备内部实现的动作，而收发器910可以用于执行前面方法中描述的终端设备向网络设备发送或从网络设备接收的动作。具体请见前面方法中的描述，此处不再赘述。
可选地，上述终端设备900还可以包括电源，用于给终端设备中的各种器件或电路提供电源。
图10是本公开提供的网络设备1000的结构示意图。该网络设备1000可应用于如图1所示的***中，执行上述方法中接入网设备的功能。如图所示，该网络设备1000包括处理器1020和收发器1010。可选地，该网络设备1000还包括存储器。其中，处理器1020、收发器1010和存储器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。该存储器用于存储计算机程序，该处理器1020用于执行该存储器中的该计算机程序，以控制该收发器1010收发信号。
上述处理器1020可以用于执行前面方法中描述的由网络设备内部实现的动作，而收发器1010可以用于执行前面方法中描述的网络设备向网络设备发送或从网络设备接收的动作。具体请见前面方法中的描述，此处不再赘述。
可选地，上述网络设备1000还可以包括电源，用于给网络设备中的各种器件或电路提供电源。
图9所示的终端设备和图10所示的网络设备中，处理器可以和存储器可以合成一个处理装置，处理器用于执行存储器中存储的程序代码来实现上述功能。具体实现时，该存储器也可以集成在处理器中，或者独立于处理器。该处理器可以与图8中的处理单元对应。 收发器可以与图8中的收发单元对应。收发器910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。
本公开中，处理器可以是通用处理器、数字信号处理器、专用集成电路、现场可编程门阵列或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件，可以实现或者执行本公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者任何常规的处理器等。结合本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。
本公开中，存储器可以是非易失性存储器，比如硬盘(hard disk drive，HDD)或固态硬盘(solid-state drive，SSD)等，还可以是易失性存储器(volatile memory)，例如随机存取存储器(random-access memory，RAM)。存储器是能够用于携带或存储具有指令或数据结构形式的期望的程序代码并能够由计算机存取的任何其他介质，但不限于此。本申请中的存储器还可以是电路或者其它任意能够实现存储功能的装置，用于存储程序指令和/或数据。
本公开还提供了一种处理装置，包括处理器和(通信)接口；所述处理器用于执行上述任一方法中的方法。
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***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。
根据本公开提供的方法，本公开还提供一种计算机程序产品，该计算机程序产品包括：计算机程序代码，当该计算机程序代码由一个或多个处理器执行时，使得包括该处理器的装置执行图2至图7以及图7A、图7B所示中的方法。
本公开提供的技术方案可以全部或部分地通过软件、硬件、固件或者其任意组合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机程序指令时，全部或部分地产生按照本发明所述的流程或功能。上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，该计算机可读存储介质可以是计算机可以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，数字视频光盘(digital video disc，DVD))、或者半导体介质等。
根据本公开提供的方法，本公开还提供一种计算机可读存储介质，该计算机可读存储介质存储有程序代码，当该程序代码由一个或多个处理器运行时，使得包括该处理器的装置执行图2至图7以及图7A、图7B所示中的方法。
根据本公开提供的方法，本公开还提供一种***，其包括前述的一个或多个终端设备。还***还可以进一步包括前述的一个或多个接入网设备。
在本公开所提供的几个中，应该理解到，所揭露的***、装置和方法，可以通过其它 的方式实现。例如，以上所描述的装置仅仅是示意性的，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***，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方案的目的。
以上所述，仅为本公开的具体实施方式，但本公开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公开揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本公开的保护范围之内。因此，本公开的保护范围应以所述权利要求的保护范围为准。

Claims (35)

  1. 一种通信方法，其特征在于，所述方法用于终端设备，所述方法包括：
    由源小区重定向至目标小区，其中，所述源小区由源接入网设备管理，所述目标小区由目标接入网设备管理；
    发送第一报告，所述第一报告包括用于指示所述终端设备执行小区重定向过程中存在潜在失败的信息，以及包括所述目标小区的标识信息。
  2. 根据权利要求1所述的方法，其特征在于，所述方法还包括：
    在所述小区重定向过程满足报告条件的情况下，触发所述终端设备记录所述第一报告，其中，所述报告条件包括以下一种或多种条件：
    第一计时器的运行时长小于或等于第一门限值，且大于或等于第二门限值，所述第一计时器的运行时长为所述终端设备接收到来自所述源接入网设备的无线资源控制RRC释放消息到所述终端设备向所述目标接入网设备发送随机接入前导码之间的时长；
    第二计时器的运行时长小于或等于第三门限值，且大于或等于第四门限值，所述第二计时器的运行时长为所述终端设备接收到来自所述源接入网设备的RRC释放消息到所述终端设备接收到来自所述目标接入网设备的RRC连接建立消息之间的时长；
    第三计时器的运行时长小于或等于第五门限值，且大于或等于第六门限值，所述第三计时器的运行时长为所述终端设备向所述目标接入网设备发送RRC连接请求消息到所述终端设备接收到来自所述目标接入网设备的RRC连接建立消息之间的时长；
    所述终端设备在第一频点执行小区重定向失败，且在所述第一频点以外的频点执行小区重定向成功，所述第一频点为所述源接入网设备为所述终端设备配置的用于小区重定向的候选频点，所述目标小区的频点为所述第一频点以外的频点。
  3. 根据权利要求2所述的方法，其特征在于，
    所述第二门限值为所述第一门限值与第一系数的乘积，和/或，
    所述第四门限值为所述第三门限值与第二系数的乘积，和/或，
    所述第六门限值为所述第五门限值与第三系数的乘积，
    其中，所述第一系数、所述第二系数和所述第三系数小于1。
  4. 根据权利要求2或3所述的方法，其特征在于，所述方法还包括：
    接收第一指示信息，所述第一指示信息用于指示所述报告条件。
  5. 根据权利要求4所述的方法，其特征在于，所述终端设备接收第一指示信息，包括：
    接收RRC消息，所述RRC消息包括所述第一指示信息。
  6. 根据权利要求2至5中任一项所述的方法，其特征在于，所述第一报告用于指示以下一项或多项：
    所述报告条件、所述源小区的标识信息、小区测量信息、所述重定向频点信息、所述目标小区的标识信息、所述目标小区的频点信息、所述第一计时器的运行时长、所述第二计时器的运行时长、所述第三计时器的运行时长或第四计时器的运行时长，
    其中，所述小区测量信息包括所述源小区的测量信息、目标小区的测量信息、所述源小区的邻小区的测量信息、或所述目标小区的邻小区的测量信息的一种或者多种，所述第四计时器的运行时长是所述终端设备接收到来自所述源接入网设备的RRC释放消息至所述终端设备与所述目标接入网设备成功建立业务通道之间的时长，或者所述第四计时器的 运行时长是所述终端设备接收到来自所述源接入网设备的RRC释放消息至所述终端设备与所述目标接入网设备成功传输业务数据包之间的时长。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述终端设备发送第一报告，包括：
    向所述目标接入网设备发送所述第一报告，所述第一报告包括所述源小区的标识信息。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述第一报告还包括第二指示信息，所述第二指示信息用于指示所述小区重定向是由业务触发的或由信号覆盖质量触发的。
  9. 根据权利要求1至8中任一项所述的方法，其特征在于，所述小区重定向是由业务触发的，所述目标接入网设备与所述源接入网设备采用的无线接入技术RAT不同。
  10. 一种通信方法，其特征在于，包括：
    接收来自终端设备的第一报告，所述第一报告包括用于指示所述终端设备执行小区重定向过程中存在潜在失败的信息，以及包括所述重定向的目标小区的标识信息，所述目标小区由目标接入网设备管理。
  11. 根据权利要求10所述的方法，其特征在于，所述方法还包括：
    向源接入网设备发送所述第一报告，所述第一报告包括所述重定向的源小区的标识信息，所述源小区由所述源接入网设备管理；和/或，
    根据所述第一报告，调整网络配置参数。
  12. 根据权利要求10或11所述的方法，其特征在于，所述第一报告用于指示触发所述终端设备发送所述第一报告的报告条件，所述报告条件包括以下一种或多种条件：
    第一计时器的运行时长小于或等于第一门限值，且大于或等于第二门限值，所述第一计时器的运行时长为所述终端设备接收到来自源接入网设备的无线资源控制RRC释放消息到所述终端设备向所述目标接入网设备发送随机接入前导码之间的时长；
    第二计时器的运行时长小于或等于第三门限值，且大于或等于第四门限值，所述第二计时器的运行时长为所述终端设备接收到来自所述源接入网设备的RRC释放消息到所述终端设备接收到来自所述目标接入网设备的RRC连接建立消息之间的时长；
    第三计时器的运行时长小于或等于第五门限值，且大于或等于第六门限值，所述第三计时器的运行时长为所述终端设备向所述目标接入网设备发送RRC连接请求消息到所述终端设备接收到来自所述目标接入网设备的RRC连接建立消息之间的时长；
    所述终端设备在第一频点执行小区重定向失败，且在所述第一频点以外的频点执行小区重定向成功，所述第一频点为所述源接入网设备为所述终端设备配置的用于小区重定向的候选频点，所述目标小区的频点为所述第一频点以外的频点，
    其中，所述源接入网设备管理所述小区重定向的源小区。
  13. 根据权利要求12所述的方法，其特征在于，
    所述第二门限值为所述第一门限值与第一系数的乘积，和/或，
    所述第四门限值为所述第三门限值与第二系数的乘积，和/或，
    所述第六门限值为所述第五门限值与第三系数的乘积，
    其中，所述第一系数、所述第二系数和所述第三系数小于1。
  14. 根据权利要求12或13所述的方法，其特征在于，所述第一报告用于指示以下一项或多项：
    所述源小区的标识信息、小区测量信息、所述重定向频点信息、所述目标小区的标识信息、所述目标小区的频点信息、所述第一计时器的运行时长、所述第二计时器的运行时长、所述第三计时器的运行时长或第四计时器的运行时长，
    其中，所述小区测量信息包括所述源小区的测量信息、目标小区的测量信息、所述源小区的邻小区的测量信息、或所述目标小区的邻小区的测量信息的一种或多种，所述第四计时器的运行时长是所述终端设备接收到来自所述源接入网设备的RRC释放消息至所述终端设备与所述目标接入网设备成功建立业务通道之间的时长，或者所述第四计时器的运行时长是所述终端设备接收到来自所述源接入网设备的RRC释放消息至所述终端设备与所述目标接入网设备成功传输业务数据包之间的时长。
  15. 根据权利要求12至14中任一项所述的方法，其特征在于，所述方法还包括：
    向所述终端设备发送第一指示信息，所述第一指示信息用于指示所述报告条件。
  16. 根据权利要求15所述的方法，其特征在于，所述向所述终端设备发送第一指示信息，包括：
    向所述终端设备发送RRC消息，所述RRC消息包括所述第一指示信息。
  17. 根据权利要求10至16中任一项所述的方法，其特征在于，所述第一报告还包括第二指示信息，所述第二指示信息用于指示所述小区重定向是由业务触发的或由信号覆盖质量触发的。
  18. 根据权利要求10至17中任一项所述的方法，其特征在于，所述小区重定向是由语音业务触发的，所述目标接入网设备与源接入网设备采用的无线接入技术RAT不同，所述源接入网设备管理所述小区重定向的源小区。
  19. 一种通信方法，其特征在于，所述方法用于终端设备，所述方法包括：
    向第一小区切换失败；
    与接入网设备管理的第二小区建立通信连接；
    向所述接入网设备发送第二报告，所述第二报告用于指示终端设备向所述第一小区切换失败，所述第二报告包括第四指示信息，所述第四指示信息用于指示所述终端设备向所述第一小区切换是由业务触发的，或者是由信号覆盖质量触发的。
  20. 根据权利要求19所述的方法，其特征在于，所述第二报告还包括第五指示信息，所述第五指示信息用于指示所述终端设备是否选择到满足条件的小区，或者指示是否选择到合适小区。
  21. 一种通信方法，其特征在于，包括：
    接收来自终端设备的第二报告，所述第二报告用于指示终端设备向第一小区切换失败，所述第二报告包括第四指示信息，所述第四指示信息用于指示所述终端设备向所述第一小区切换是由业务触发的，或者是由信号覆盖质量触发的。
  22. 根据权利要求21所述的方法，其特征在于，所述第二报告还包括第五指示信息，所述第五指示信息用于指示所述终端设备是否选择到满足条件的小区，或者指示是否选择到合适小区。
  23. 一种通信方法，其特征在于，所述方法用于终端设备，所述终端设备由源小区向第一小区切换失败，所述切换是由语音业务触发的，所述方法包括：
    执行小区选择，且未选择到满足条件的小区；
    向第二接入设备发送第三报告，所述第三报告用于指示所述终端设备向所述第一小区 切换失败，所述第二接入网设备管理所述源小区。
  24. 根据权利要求23所述的方法，其特征在于，所述第三报告包括第四指示信息和/或第五指示信息，所述第四指示信息用于指示所述切换是由语音业务触发的，所述第五指示信息用于指示终端设备未选择到满足条件的小区。
  25. 根据权利要求23或24所述的方法，其特征在于，所述向所述第二接入设备发送第三报告，包括：
    执行与所述第二接入设备连接重建立；
    向所述第二接入设备发送所述第三报告。
  26. 一种通信方法，其特征在于，所述方法用于第二接入网设备，所述方法包括：
    接收来自终端设备的第三报告，所述第三报告用于指示所述终端设备向第一小区切换失败，所述第二接入网设备管理源小区。
  27. 根据权利要求26所述的方法，其特征在于，所述第三报告包括第四指示信息和/或第五指示信息，所述第四指示信息用于指示所述切换是由语音业务触发的，所述第五指示信息用于指示终端设备未选择到满足条件的小区。
  28. 根据权利要求26或27所述的方法，其特征在于，所述接收来自所述终端设备的第三报告，包括：
    与所述终端设备执行连接重建立；
    接收来自所述终端设备的所述第三报告。
  29. 一种通信装置，其特征在于，包括：
    用于执行如权利要求1至9或19至20或23至25中任一项所述的方法的单元或模块。
  30. 一种通信装置，其特征在于，包括：
    用于执行如权利要求10至18或21至22或26至28中任一项所述的方法的单元或模块。
  31. 一种通信装置，其特征在于，包括处理器和通信接口，所述处理器利用所述通信接口，执行如权利要求1至9或19至20或23至25中任一项所述的方法，或执行如权利要求10至18、22或26至28中任一项所述的方法。
  32. 一种计算机可读存储介质，其特征在于，存储有指令，当所述指令在计算机上运行时，使得所述计算机执行如权利要求1至9或19至20或23至25中任一项所述的方法，或执行如权利要求10至18或21至22或26至28中任一项所述的方法。
  33. 一种计算机程序产品，其特征在于，包括指令，当所述指令被运行时，实现如权利要求1至9或19至20或23至25中任一项所述的方法，或执行如权利要求10至18或21至22或26至28中任一项所述的方法。
  34. 一种通信***，其特征在于，包括接入网设备，其中，所述接入网设备用于执行如权利要求10至18或19至20或23至25任一项所述的方法。
  35. 根据权利要求34所述的通信***，其特征在于，包括终端设备，所述终端设备用于执行如权利要求1至9或21至22或26至28任一项所述的方法。
PCT/CN2023/083505 2022-03-24 2023-03-23 通信方法和通信装置 WO2023179736A1 (zh)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200015132A1 (en) * 2017-04-11 2020-01-09 Huawei Technologies Co., Ltd. Mobility Management Method, Access Network Device, And Terminal Device
CN112312487A (zh) * 2019-07-31 2021-02-02 华为技术有限公司 通信方法和通信装置
CN113709826A (zh) * 2020-05-21 2021-11-26 华为技术有限公司 通信方法、装置及***
WO2022051900A1 (zh) * 2020-09-08 2022-03-17 Oppo广东移动通信有限公司 发送成功切换报告的方法、终端设备和网络设备

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20200015132A1 (en) * 2017-04-11 2020-01-09 Huawei Technologies Co., Ltd. Mobility Management Method, Access Network Device, And Terminal Device
CN112312487A (zh) * 2019-07-31 2021-02-02 华为技术有限公司 通信方法和通信装置
CN113709826A (zh) * 2020-05-21 2021-11-26 华为技术有限公司 通信方法、装置及***
WO2022051900A1 (zh) * 2020-09-08 2022-03-17 Oppo广东移动通信有限公司 发送成功切换报告的方法、终端设备和网络设备

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