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WO2023016195A1 - 呼叫处理方法、装置、终端设备及存储介质 - Google Patents

呼叫处理方法、装置、终端设备及存储介质 Download PDF

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Publication number
WO2023016195A1
WO2023016195A1 PCT/CN2022/106390 CN2022106390W WO2023016195A1 WO 2023016195 A1 WO2023016195 A1 WO 2023016195A1 CN 2022106390 W CN2022106390 W CN 2022106390W WO 2023016195 A1 WO2023016195 A1 WO 2023016195A1
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Prior art keywords
cell
lte cell
lte
call
abnormal
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PCT/CN2022/106390
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English (en)
French (fr)
Inventor
张健
Original Assignee
Oppo广东移动通信有限公司
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Publication date
Application filed by Oppo广东移动通信有限公司 filed Critical Oppo广东移动通信有限公司
Publication of WO2023016195A1 publication Critical patent/WO2023016195A1/zh

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/16—Communication-related supplementary services, e.g. call-transfer or call-hold
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Definitions

  • the present application relates to the technical field of communication, and in particular to a call processing method, device, terminal equipment and storage medium.
  • the voice service in the fifth generation mobile communication technology (5th Generation, 5G) new air interface (New Radio, NR) cell can be carried by the way of Evolved Packet System Fall Back (EPSFB) to the Long Term Evolution (Long Term Evolution).
  • EPSFB Evolved Packet System Fall Back
  • LTE Long Term Evolution
  • the EPSFB-based voice service process of the terminal device in the NR cell is as follows: the terminal device sends a service request (Service Request) for a call (Mobile originating call, Mo call) to the network device, and after receiving the Service Request, the network device sends the service request to the terminal device A redirection message, which is used to instruct the terminal device to redirect from the NR cell to the LTE cell, and send an LTE reconfiguration message to the terminal device; the terminal device is handover (handover) to the LTE cell, and the call is connected successfully .
  • Service Request Service Request
  • Mo call Mobile originating call
  • a redirection message which is used to instruct the terminal device to redirect from the NR cell to the LTE cell, and send an LTE reconfiguration message to the terminal device
  • the terminal device is handover (handover) to the LTE cell, and the call is connected successfully .
  • the reconfiguration message corresponding to the LTE cell sent by the network device will release the Data Radio Bearer (DRB) corresponding to the Quality of Service Class Identifier (QCI), and the release of the DRB will cause the call to fail.
  • DRB Data Radio Bearer
  • QCI Quality of Service Class Identifier
  • the embodiment of the present application provides a call processing method, device, terminal equipment and storage medium to solve the problem of call failure caused by releasing DRB in the voice service process based on the fallback of the evolved packet system.
  • a call processing method applied to a terminal device includes: after the terminal device initiates a service request for a call based on an evolved packet system fallback, the receiving network device sends a call according to the service request.
  • a redirection message the redirection message is used to instruct the terminal device to redirect from the NR cell to the first LTE cell; when the first LTE cell is an abnormal cell and a normal second LTE cell is detected, the NR The cell is handed over to the second LTE cell, so that the call is connected; wherein, the abnormal cell is a cell whose number of times of releasing DRB events is greater than or equal to a number threshold.
  • a call processing apparatus including: a receiving module and a switching module; the receiving module is configured to receive a call processing request based on an evolved packet system fallback after the terminal device initiates A redirection message sent by the network device according to the service request, the redirection message is used to instruct the terminal device to redirect from the new air interface NR cell to the first long-term evolution LTE cell; the handover module is used for abnormal cells in the first LTE cell , and when a normal second LTE cell is detected, switch from the NR cell to the second LTE cell, so that the call is connected; wherein, the abnormal cell is that the number of release data radio bearer DRB events occurs is greater than or equal to the number of times Threshold cell.
  • a terminal device including: a memory storing executable program codes; and a processor and a transceiver coupled to the memory; the processor invokes all stored in the memory
  • the executable program code when the executable program code is executed by the processor, causes the processor and the transceiver to implement the steps of the call processing method as described in the first aspect.
  • the fourth aspect of the embodiments of the present application provides a readable storage medium, on which a program or instruction is stored, and when the program or instruction is executed by a processor, the steps of the call processing method as described in the first aspect are implemented .
  • the fifth aspect of the embodiments of the present application provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the Call handling method.
  • the redirection message sent by the network device according to the service request may be received, and the redirection message is used to instruct the terminal device to switch from the NR cell Redirect to the first LTE cell; when the first LTE cell is an abnormal cell and detects a normal second LTE cell, switch from the NR cell to the second LTE cell so that the call is connected; wherein,
  • the abnormal cell is a cell whose number of release DRB events is greater than or equal to the number threshold.
  • the first LTE cell is an abnormal cell (a cell whose number of times of releasing DRB events is greater than or equal to the number threshold), then handover from the NR cell to the non-abnormal cell The second LTE cell, so as to ensure that the call failure will not be caused by the handover of the terminal equipment to the cell (first LTE cell) that releases the DRB.
  • an abnormal cell a cell whose number of times of releasing DRB events is greater than or equal to the number threshold
  • FIG. 1 is a schematic structural diagram of a communication system provided by an embodiment of the present application.
  • FIG. 2A is one of the schematic flowcharts of the call processing method provided by the embodiment of the present application.
  • FIG. 2B is the second schematic flow diagram of the call processing method provided by the embodiment of the present application.
  • FIG. 2C is the third schematic flow diagram of the call processing method provided by the embodiment of the present application.
  • FIG. 2D is the fourth schematic flow diagram of the call processing method provided by the embodiment of the present application.
  • FIG. 2E is the fifth schematic flow diagram of the call processing method provided by the embodiment of the present application.
  • FIG. 2F is the sixth schematic flow diagram of the call processing method provided by the embodiment of the present application.
  • FIG. 3 is the seventh schematic flow diagram of the call processing method provided by the embodiment of the present application.
  • FIG. 4 is a structural block diagram of a call processing device provided in an embodiment of the present application.
  • FIG. 5 is a schematic diagram of a hardware structure of a terminal device provided in an embodiment of the present application.
  • the implementation of voice services is no longer limited to 2G/3G networks, simply providing voice services and other value-added services through the circuit domain network, but designing a protocol (Internet Protocol, IP) for interconnection between networks.
  • IP Internet Protocol
  • the multimedia subsystem IMS, IP Multimedia Subsystem
  • the multimedia subsystem implements the voice service carried on the IP network, that is, the LTE voice solution (Voice over LTE, VoLTE), and realizes all services in the 2G/3G circuit domain on the 4G network.
  • 4G During the gradual deployment and expansion of the 4G network, in consideration of the different stages of network development and the continuity of voice services, 4G also proposed such as circuit domain fallback (CSFB, Circuit Switched Fallback) and single radio voice call continuity (SRVCC, Single Radio Voice Call Continuity) and other transition solutions.
  • CSFB circuit domain fallback
  • SRVCC single radio voice call continuity
  • the design of the 5G NR voice solution continues the 4G LTE method of carrying voice services through the IP network, and carries the voice services through the 5G network (wireless network + core network) and IMS system.
  • This method is called the NR voice solution (Voice over NR, VoNR ).
  • the design of the fallback solution is also very necessary, so the fallback solution for the evolved packet system is also One of the 5G voice solutions.
  • EPSF mainly refers to the implementation of voice services through VoLTE from 5G to 4G.
  • due to the existence of various voice solutions in the 4G network when the wireless environment of the 4G network is poor, it is inevitable that the UE will complete the voice service through methods such as CSFB. business.
  • the terminal device In the embodiment of this application, it is mainly applied to the fallback solution of the evolved packet system in the 5G voice solution.
  • some network equipment such as overseas network equipment
  • the terminal device detects that the DRB is released and has not been re-established within a preset period of time (such as 6 seconds).
  • the terminal device will actively report to the network device a session end message (BYE) carrying the reason value of Media bearer loss (Media bearer loss), thereby causing the call to fail. For this reason, the call failure rate increases.
  • BYE session end message
  • the redirection message sent by the network device according to the service request can be received, and the redirection message can be used to Instructing the terminal device to redirect from the NR cell to the first LTE cell; when the first LTE cell is an abnormal cell and a normal second LTE cell is detected, switch from the NR cell to the second LTE cell, to making the call connected; wherein, the abnormal cell is a cell whose number of release DRB events is greater than or equal to the number threshold.
  • the first LTE cell is an abnormal cell (a cell whose number of times of releasing DRB events is greater than or equal to the number threshold), then handover from the NR cell to the non-abnormal cell The second LTE cell, so as to ensure that the call failure will not be caused by the handover of the terminal equipment to the cell (first LTE cell) that releases the DRB.
  • an abnormal cell a cell whose number of times of releasing DRB events is greater than or equal to the number threshold
  • Fig. 1 shows a block diagram of a wireless communication system to which the embodiment of the present application is applicable.
  • the wireless communication system includes a terminal device 11 and at least two network devices 12 (one network device 12 is shown in the figure).
  • the terminal device 11 can also be called a terminal or a user terminal (User Equipment, UE), and the terminal device 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer) or a notebook computer, a personal Digital assistant (Personal Digital Assistant, PDA), handheld computer, netbook, ultra-mobile personal computer (ultra-mobile personal computer, UMPC), mobile Internet device (Mobile Internet Device, MID), wearable device (Wearable Device) or vehicle Devices (VUE), Pedestrian Terminals (PUE) and other terminal-side devices, and wearable devices include: smart watches, bracelets, earphones, glasses, etc.
  • the network device 12 may be a network device and may include one or more access network devices or a core network, where the access network device may be referred to as a base station, node B, evolved node B, access point, base transceiver station (Base Transceiver Station, BTS), Radio Base Station, Radio Transceiver, Basic Service Set (BSS), Extended Service Set (Extended Service Set, ESS), B Node, Evolved Node B (eNB), Home Node B, Home eNodeB, WLAN access point, WiFi node, Transmitting Receiving Point (TRP), Network Server (Network Server, NW) or some other appropriate term in the field, as long as the same technical As a result, the access network equipment is not limited to specific technical terms.
  • base stations in the NR system and base stations in the LTE system are used as examples, but specific types are not limited.
  • the execution subject of the call processing method provided by the embodiment of the present application may be the above-mentioned terminal equipment (including mobile terminal equipment and non-mobile terminal equipment), or it may be a functional module and/or function capable of implementing the call processing method in the terminal equipment
  • the entity can be specifically determined according to actual usage requirements, and is not limited in this embodiment of the application.
  • the present application provides a call processing method, which is applied to a terminal device, and the method includes:
  • the redirection message is used to instruct the terminal device to redirect from a new air interface NR cell to the first LTE cell;
  • the abnormal cell is a cell whose number of times of releasing DRB events is greater than or equal to a number threshold.
  • the method before receiving the redirection message sent by the network device according to the service request, the method further includes:
  • the method further includes:
  • the first LTE cell is marked as the abnormal cell, determine that the first LTE cell is the abnormal cell.
  • marking the first LTE cell as the abnormal cell includes:
  • the determining that the first LTE cell is the abnormal cell when it is detected that the first LTE cell is marked as the abnormal cell includes:
  • marking the first LTE cell as the abnormal cell includes:
  • the determining that the first LTE cell is the abnormal cell when it is detected that the first LTE cell is marked as the abnormal cell includes:
  • the first LTE cell is a cell in the blacklist, determine that the first LTE cell is the abnormal cell.
  • marking the first LTE cell as the abnormal cell includes:
  • the method also includes:
  • the second period is after the first period.
  • the event of releasing the DRB includes at least one of the following:
  • the DRB is released during the VoLTE call establishment process of the LTE voice solution.
  • the method further includes:
  • the method further includes:
  • the first LTE cell is not the abnormal cell, switching from the NR cell to the first LTE cell, so that the call is connected.
  • the method also includes:
  • a service request for a call based on the fallback of the evolved packet system is initiated to the network device.
  • the second LTE cell is a cell in which no DRB release event occurs, or a cell in which a DRB release event occurs for a number of times less than a threshold value.
  • the second LTE cell meets at least one of the following:
  • the reference signal received power RSRP is greater than or equal to the power threshold; the reference signal received quality RSRQ is greater than or equal to the quality threshold; the signal-to-interference-plus-noise ratio SINR is greater than or equal to the ratio threshold.
  • the second LTE cell meets at least one of the following:
  • the reference signal received power RSRP is the best; the reference signal received quality RSRQ is the best; the signal-to-interference-plus-noise ratio SINR is the best.
  • the embodiment of the present application provides a call processing method.
  • the call processing method provided by the embodiment of the present application will be exemplarily described below by taking the execution subject as a terminal device as an example.
  • the method may include steps 201 to 202 as described below.
  • the terminal device After the terminal device initiates a service request for an EPS fallback-based call, the terminal device receives a redirection message sent by the network device according to the service request.
  • the redirection message is used to instruct the terminal device to redirect from the NR cell to the first LTE cell.
  • the terminal device when the terminal device needs to make a call based on the fallback of the evolved packet system, the terminal device initiates a service request for the call based on the fallback of the evolved packet system to a network device (such as a NW).
  • the network device receives the service request, generates a redirection message according to the service request, then sends a redirection message to the terminal device, and finally sends a reconfiguration message to the terminal device (the DRB may be released in the reconfiguration message).
  • the terminal device before the terminal device switches to the first LTE cell, the terminal device cannot know whether the network device releases the DRB according to the reconfiguration message, and only after the call fails can it be known that the call back caused by the release of the DRB Finish.
  • the terminal device switches from the NR cell to the second LTE cell, so that the call is connected.
  • the abnormal cell is a cell whose times of releasing DRB events are greater than or equal to the times threshold.
  • the number of times threshold may be determined according to actual usage conditions, which is not limited in this embodiment of the present application.
  • the times threshold may be 2.
  • each time the terminal device detects that a DRB release event occurs in a cell it records a DRB release event for the cell, sets a counter, and accumulates the number of times the DRB release event occurs in the cell.
  • the number of release DRB events recorded by the counter is greater than or When it is equal to the number of times threshold, set the cell as an abnormal cell.
  • the first LTE cell is a cell whose number of DRB release events occurs is greater than or equal to the number threshold
  • the normal second LTE cell is a cell where no DRB release event occurs, or a cell whose number of DRB release events occurs is less than the number threshold.
  • the normal second LTE cell can also satisfy (denoted as the first condition) at least one of the following: adjacent to the first LTE cell; Reference Signal Received Power (Reference Signal Receiving Power, RSRP) is greater than or equal to the power threshold The cell; the Reference Signal Receiving Quality (RSRQ) is greater than or equal to the quality threshold; the Signal to Interference plus Noise Ratio (SINR) is greater than or equal to the proportional threshold.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Receiving Quality
  • SINR Signal to Interference plus Noise Ratio
  • the power threshold may be determined according to actual usage requirements, which is not limited in this embodiment of the present application.
  • the power threshold may be -105dBm.
  • the quality threshold may be determined according to actual usage requirements, which is not limited in this embodiment of the present application.
  • ratio threshold may be determined according to actual usage requirements, which is not limited in this embodiment of the present application.
  • the conditions satisfied by the second LTE cell may be determined according to actual usage requirements, which is not limited in this embodiment of the present application.
  • the second LTE cell is adjacent to the first LTE cell.
  • the second LTE cell may be any one of the cells adjacent to the first LTE cell; the second LTE cell may also be a cell adjacent to the first LTE cell with the best RSRP.
  • the second LTE cell is adjacent to the first LTE cell, and the second LTE cell satisfies the target condition.
  • the second LTE cell may be any one of the cells adjacent to the first LTE cell, and the second LTE cell satisfies the target condition; the second LTE cell may also be adjacent to the first LTE cell, and the second LTE cell may be adjacent to the first LTE cell, and The second LTE cell is the best RSRP among the cells satisfying the target condition.
  • the second LTE cell satisfies the target condition.
  • the second LTE cell may be any one of the cells meeting the target condition; the second LTE cell may be the best RSRP among the cells meeting the target condition.
  • the second LTE cell is any one of the LTE cells satisfying the foregoing conditions.
  • the second LTE cell is the one with the best RSRP among the LTE cells meeting the above conditions.
  • the target condition includes at least one of the following: a cell whose RSRP is greater than or equal to a power threshold; RSRQ greater than or equal to a quality threshold; and SINR greater than or equal to a ratio threshold.
  • the target condition may include cells whose RSRP is greater than or equal to a power threshold.
  • the target condition may include that RSRQ is greater than or equal to a quality threshold.
  • the target condition may include a SINR greater than or equal to a proportional threshold.
  • the target condition may include a cell whose RSRP is greater than or equal to a power threshold, and whose RSRQ is greater than or equal to a quality threshold.
  • the target condition may include cells with RSRP greater than or equal to a power threshold and SINR greater than or equal to a proportional threshold.
  • the target condition may include RSRQ greater than or equal to a quality threshold, and SINR greater than or equal to a ratio threshold.
  • the target conditions may include cells with RSRP greater than or equal to a power threshold, RSRQ greater than or equal to a quality threshold, and SINR greater than or equal to a proportional threshold.
  • the signal quality of the first LTE cell when the second LTE cell is adjacent to the first LTE cell, the signal quality of the first LTE cell is better, and when the second LTE cell satisfies the target condition, the signal quality of the second LTE cell is better.
  • the signal quality of the second LTE cell is better, it can be ensured that the call will not be dropped due to poor signal quality during the call, resulting in disconnection of the call.
  • the terminal device when the terminal device detects that the number of times the first LTE cell releases the DRB time is greater than or equal to the number threshold, it can set a specific identifier (such as a specific priority) for the first LTE cell.
  • a specific identifier such as a specific priority
  • the cell information for example, identity information (identification, ID), frequency point information, etc.
  • the first LTE cell may be added to the abnormal cell group to indicate that the first LTE cell is an abnormal cell, and other methods may also be used to indicate that the first LTE cell is an abnormal cell, which is not limited in this embodiment of the present application.
  • the call processing method provided by the embodiment of the present application may further include the following step 203, after the above step 201, the call processing method provided by the embodiment of the present application
  • the call processing method may further include step 204 described below.
  • the terminal device When detecting that the number of times the DRB release event occurs in the first LTE cell within the first period is greater than or equal to the number threshold, the terminal device marks the first LTE cell as an abnormal cell.
  • the duration of the first period may be determined according to actual usage conditions, and is not limited in this embodiment of the present application.
  • the terminal device may mark the first LTE cell as an abnormal cell in a targeted manner. For example, the terminal device may mark the first LTE cell as an abnormal cell by lowering the priority of the first LTE cell, or the terminal device may mark the first LTE cell as an abnormal cell by adding the first LTE cell to the blacklist, and the terminal device
  • the first LTE cell may also be marked as an abnormal cell in other ways, which is not limited in this embodiment of the present application.
  • the terminal device determines that the first LTE cell is an abnormal cell.
  • the first LTE cell is marked as an abnormal cell. After the first cycle, if the first LTE cell is detected is marked as an abnormal cell, it is determined that the first LTE cell is an abnormal cell.
  • the number of times the DRB release event occurs in the first LTE cell within the first cycle is greater than or equal to the number threshold, which can prevent the first LTE cell from A DRB release event (or DRB release due to other reasons) occurs many times in a long period of time and is marked as an abnormal cell, so that the terminal equipment cannot switch to the first LTE cell that is actually normal, so as to affect the normal establishment of the call.
  • step 203 may be specifically implemented through the following step 203a, and the foregoing step 204 may be specifically implemented through the following step 204a.
  • the terminal device marks the first LTE cell as an abnormal cell by setting the priority of the first LTE cell as the lowest priority corresponding to the call.
  • the terminal device determines that the first LTE cell is an abnormal cell.
  • the cell corresponding to the lowest priority is a cell whose number of times the DRB release event occurs within the first period is greater than or equal to the number threshold.
  • a cell that is not the lowest priority is not a cell whose number of times the DRB release event occurs within the first period is greater than or equal to the number of times threshold.
  • the LTE cell with the lowest priority has a lower priority than other LTE cells with lower priority, and is the priority of the abnormal cell.
  • the first cell is marked as an abnormal cell, so that when it is detected that the priority of the first LTE cell is the lowest priority, Determining that the first LTE cell is an abnormal cell can simplify the process of determining whether the first LTE cell is an abnormal cell, can improve the efficiency of determining whether the first LTE cell is an abnormal cell, and can save power consumption.
  • step 203 may be specifically implemented through the following step 203b, and the foregoing step 204 may be specifically implemented through the following step 204b.
  • the terminal device marks the first LTE cell as an abnormal cell by adding the first LTE cell to the blacklist corresponding to the call.
  • the terminal device determines that the first LTE cell is an abnormal cell.
  • the cells in the blacklist are cells whose number of times the DRB release event occurs within the first period is greater than or equal to the number of times threshold.
  • the first LTE cell is marked as an abnormal cell by adding the first LTE cell to the blacklist, so that the first LTE cell is determined when it is detected that the first LTE cell is a cell in the blacklist If it is a normal cell, the process of determining whether the first LTE cell is an abnormal cell can be simplified, the efficiency of determining whether the first LTE cell is an abnormal cell can be improved, and power consumption can be saved.
  • the cell may be marked as an abnormal cell when the number of DRB release events occurring in the cell within the first period is greater than or equal to the number threshold. It is also possible to mark the cell as an abnormal cell in the second cycle when the number of DRB release events that occur in the cell in the first cycle is greater than or equal to the number threshold, and cancel the marking process of the cell as an abnormal cell after the second cycle . Then, if it is detected that the cell indicated by the redirection message is marked as an abnormal cell, it is determined that the cell is an abnormal cell; if it is detected that the cell indicated by the redirection message is not marked as an abnormal cell, then it is determined that the cell is a normal cell.
  • the above step 203 may be specifically implemented through the following step 203c.
  • the call processing method provided by the embodiment of the present application may further include the following step 205.
  • the terminal device marks the first LTE cell as an abnormal cell in the second period.
  • the terminal device cancels the process of marking the first LTE cell as an abnormal cell.
  • the second period is after the first period.
  • the duration of the second period may be determined according to actual usage conditions, and is not limited in this embodiment of the present application.
  • an abnormal cell is a cell whose number of release DRB events is greater than or equal to the number threshold in the first period, and the first period is before the current moment (receiving the redirection message), and the duration from the current moment is less than Or a time period equal to the target duration, where the target duration is the duration of the second cycle.
  • the terminal device can set a timer, and the timing duration can be the duration of the second cycle.
  • the first LTE cell is marked as an abnormal cell; after the timer expires, the first LTE cell is canceled.
  • the cell is marked as an abnormal cell; after the timer expires, the first LTE cell of the terminal device is set as a normal cell and is no longer marked as an abnormal cell.
  • the terminal device may cancel the setting of the lowest priority and delete the information of the first LTE cell from the blacklist.
  • the first LTE cell is marked as an abnormal cell in the second period, and the marking process of the first LTE cell as an abnormal cell is canceled after the second period, because the first LTE cell may be repaired, and when it is repaired , there will be no DRB release event, so it does not need to be marked as an abnormal cell.
  • the terminal device can switch to the first LTE cell in time, so as to avoid affecting the normal establishment of the call.
  • the releasing DRB event includes at least one of the following: releasing the DRB during the call establishment process corresponding to the call; releasing the DRB during the LTE voice scheme (Voice over LTE, VoLTE) call establishment process.
  • LTE voice scheme Voice over LTE, VoLTE
  • releasing the DRB during the call establishment process corresponding to the call is to release the DRB in the reconfiguration message of the EPSFB-based voice service call establishment process.
  • the event of releasing the DRB is releasing the DRB during the session establishment process corresponding to the call.
  • the event of releasing the DRB is releasing the DRB during the establishment of the VoLTE call.
  • the event of releasing the DRB includes: releasing the DRB during the establishment process of the call corresponding to the call, and releasing the DRB during the establishment process of the VoLTE call. It can be understood that every time it is detected that the DRB is released during the call establishment process corresponding to the call, the DRB release event is counted once, and every time the DRB release is detected during the VoLTE call establishment process, the DRB release event is also counted once.
  • various possible DRB release events are provided, and the most suitable DRB release event can be determined according to the actual situation in actual use.
  • the call processing method provided in this embodiment of the present application may further include the following steps 206 to 207 .
  • the terminal device switches from the NR cell to the first LTE cell, and from the first LTE cell to the 3G cell, so that the call is connected.
  • the terminal device switches from the NR cell to the first LTE cell, and from the first LTE cell to the 2G cell, to make the call go through.
  • the network device when initiating a call service request based on EPSFB, the network device is the network device corresponding to the NR cell; when receiving the redirection message and the reconfiguration message, the network device is the network device corresponding to the first LTE cell; When switching to the second LTE cell, the network device is the network device corresponding to the second LTE cell; when switching to the 3G cell, the network device is the network device corresponding to the 3G cell; when switching to the 2G cell, the network device is corresponding to the 2G cell network equipment.
  • the foregoing network devices may be the same or different, which is not limited in this embodiment of the present application.
  • the terminal device may ignore the above redirection message 1.
  • the terminal device may switch to the NR cell according to the above-mentioned redirection message 1 . In this way, the problem that the terminal device is redirected to the NR cell according to the redirection message 1 before the call ends, which causes the call failure can be avoided.
  • the call processing method provided in the embodiment of the present application may further include the following step 208.
  • the terminal device switches from the NR cell to the first LTE cell, so that the call is connected.
  • the terminal device is handed over from the NR cell to the first LTE cell, the terminal device is successfully connected to VoLTE quickly under the first LTE cell.
  • the call processing method provided by the embodiment of the present application may specifically be implemented through the following steps 301 to 309 .
  • the terminal device After the terminal device initiates a call service request based on EPSFB, the terminal device receives a redirection message sent by the network device according to the service request.
  • the terminal device determines whether the first LTE cell is an abnormal cell.
  • first LTE cell is an abnormal cell
  • execute the following step 303 If the first LTE cell is an abnormal cell, execute the following step 303; if the first LTE cell is not an abnormal cell, execute the following step 309.
  • the terminal device detects whether there is a normal second LTE cell.
  • step 304 If there is a second LTE cell that is not an abnormal cell, execute the following step 304; if there is no second LTE cell that is not an abnormal cell, execute the following step 305.
  • the terminal device switches from the NR cell to the second LTE cell, so that the call is connected.
  • the terminal device detects whether a 3G cell exists.
  • step 306 If there is a 3G cell, execute step 306 below; if there is no cell, execute step 307 below.
  • the terminal device switches from the NR cell to the first LTE cell, and then switches from the first LTE cell to the 3G cell, so that the call is connected.
  • the terminal device detects whether a 2G cell exists.
  • step 308 is performed.
  • the terminal device switches from the NR cell to the first LTE cell, and then switches from the first LTE cell to the 2G cell, so that the call is connected.
  • the terminal device switches from the NR cell to the first LTE cell.
  • step 301 to step 309 For the description of the above step 301 to step 309, reference may be made to the relevant description of the above step 201 to step 208, which will not be repeated here.
  • Fig. 4 is a structural block diagram of a call processing device shown in the embodiment of the present application. As shown in Fig. 4, it includes: a receiving module 401 and a switching module 402; After falling back to the EPSFB call service request, receiving a redirection message sent by the network device according to the service request, the redirection message is used to instruct the terminal device to redirect from the new air interface NR cell to the first long-term evolution LTE cell; the switching module 402 , used to switch from the NR cell to the second LTE cell when the first LTE cell is an abnormal cell and a normal second LTE cell is detected, so that the call is connected; wherein, the abnormal cell is released A cell whose number of data radio bearer DRB events is greater than or equal to the number threshold.
  • the second LTE cell satisfies at least one of the following: adjacent to the first LTE cell; a cell with a reference signal received power RSRP greater than or equal to a power threshold; a reference signal received quality RSRQ greater than or equal to a quality threshold; signal and interference plus The noise ratio SINR is greater than or equal to the scale threshold.
  • the call processing apparatus further includes: a marking module and a determining module; the marking module is configured to detect that the first LTE cell occurs within the first period before receiving the redirection message sent by the network device according to the service request. When the number of times of the release DRB event is greater than or equal to the number of times threshold, mark the first LTE cell as an abnormal cell; the determining module is configured to detect the first LTE cell after receiving the redirection message sent by the network device according to the service request When an LTE cell is marked as an abnormal cell, it is determined that the first LTE cell is an abnormal cell.
  • the marking module is specifically configured to mark the first LTE cell as an abnormal cell by setting the priority of the first LTE cell to the lowest priority corresponding to the call; the determining module is specifically configured to detect the first LTE cell as an abnormal cell; If the priority of an LTE cell is the lowest priority, it is determined that the first LTE cell is an abnormal cell.
  • the marking module is specifically configured to mark the first LTE cell as an abnormal cell by adding the first LTE cell to the blacklist corresponding to the call;
  • the determining module is specifically configured to detect that the first LTE cell is In the case of a cell in the blacklist, it is determined that the first LTE cell is an abnormal cell.
  • the marking module is specifically used to mark the first LTE cell as an abnormal cell in the second period; it is also used to cancel the marking process of the first LTE cell as an abnormal cell after the second period; wherein, the second period after the first cycle.
  • the event of releasing the DRB includes at least one of the following: releasing the DRB during the call establishment process corresponding to the call; releasing the DRB during the call establishment process of the LTE voice solution VoLTE.
  • the switching module 402 is also configured to switch from the NR cell to the 3G cell when no normal LTE cell is detected and a 3G cell is detected after receiving the redirection message sent by the network device according to the service request.
  • the first LTE cell switching from the first LTE cell to the 3G cell, so that the call is connected; when no normal LTE cell is detected, no 3G cell is detected, and a 2G cell is detected, from the NR
  • the cell is handed over to the first LTE cell, and from the first LTE cell to the 2G cell, so that the call is connected.
  • the switching module 402 is further configured to switch from the NR cell to the first LTE cell if the first LTE cell is not an abnormal cell after receiving the redirection message sent by the network device according to the service request, to make the call go through.
  • each module can implement the call processing method provided by the above method embodiment, and can achieve the same technical effect. To avoid repetition, details are not repeated here.
  • FIG. 5 is a schematic diagram of a hardware structure of a terminal device implementing various embodiments of the present application.
  • the terminal device includes but is not limited to: a radio frequency (radio frequency, RF) circuit 501, a memory 502, an input unit 503, Display unit 504, sensor 505, audio circuit 506, wireless communication (wireless fidelity, WiFi) module 507, processor 508, power supply 509, camera 510 and other components.
  • the radio frequency circuit 501 includes a receiver 5011 and a transmitter 5012 .
  • the structure of the terminal device shown in FIG. 5 does not constitute a limitation on the terminal device, and may include more or less components than shown in the figure, or combine some components, or arrange different components.
  • the RF circuit 501 can be used for sending and receiving information or receiving and sending signals during a call. In particular, after receiving the downlink information from the base station, it is processed by the processor 508; in addition, the designed uplink data is sent to the base station.
  • the RF circuit 501 includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, a low noise amplifier (low noise amplifier, LNA), a duplexer, and the like.
  • the RF circuit 501 can also communicate with networks and other devices through wireless communication.
  • the above wireless communication can use any communication standard or protocol, including but not limited to global system of mobile communication (global system of mobile communication, GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access) multiple access (CDMA), wideband code division multiple access (WCDMA), long term evolution (LTE), e-mail, short message service (short messaging service, SMS), etc.
  • GSM global system of mobile communication
  • GPRS general packet radio service
  • code division multiple access code division multiple access
  • WCDMA wideband code division multiple access
  • LTE long term evolution
  • e-mail short message service
  • SMS short message service
  • the memory 502 can be used to store software programs and modules, and the processor 508 executes various functional applications and data processing of the terminal device by running the software programs and modules stored in the memory 502 .
  • the memory 502 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, at least one application program required by a function (such as a sound playback function, an image playback function, etc.); Data created by the use of terminal equipment (such as audio data, phonebook, etc.), etc.
  • the memory 502 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid-state storage devices.
  • the input unit 503 can be used to receive input numbers or character information, and generate key signal input related to user settings and function control of the terminal device.
  • the input unit 503 may include a touch panel 5031 and other input devices 5032 .
  • the touch panel 5031 also referred to as a touch screen, can collect touch operations of the user on or near it (for example, the user uses any suitable object or accessory such as a finger or a stylus on the touch panel 5031 or near the touch panel 5031). operation), and drive the corresponding connection device according to the preset program.
  • the touch panel 5031 may include two parts, a touch detection device and a touch controller.
  • the touch detection device detects the user's touch orientation, and detects the signal brought by the touch operation, and transmits the signal to the touch controller; the touch controller receives the touch information from the touch detection device, converts it into contact coordinates, and sends it to the to the processor 508, and can receive and execute commands sent by the processor 508.
  • the touch panel 5031 can be realized by various methods such as resistive, capacitive, infrared, and surface acoustic wave.
  • the input unit 503 may also include other input devices 5032 .
  • other input devices 5032 may include, but are not limited to, one or more of physical keyboards, function keys (such as volume control keys, switch keys, etc.), trackballs, mice, joysticks, and the like.
  • the display unit 504 can be used to display information input by or provided to the user and various menus of the terminal device.
  • the display unit 504 may include a display panel 5041.
  • the display panel 5041 may be configured in the form of a liquid crystal display (liquid crystal display, LCD), an organic light-emitting diode (organic light-Emitting diode, OLED), or the like.
  • the touch panel 5031 may cover the display panel 5041, and when the touch panel 5031 detects a touch operation on or near it, it transmits to the processor 508 to determine the touch event, and then the processor 508 A corresponding visual output is provided on the display panel 5041 .
  • the touch panel 5031 and the display panel 5041 are used as two independent components to realize the input and input functions of the terminal device, in some embodiments, the touch panel 5031 and the display panel 5041 can be integrated And realize the input and output functions of the terminal equipment.
  • the terminal device may also include at least one sensor 505, such as a light sensor, a motion sensor, and other sensors.
  • the light sensor may include an ambient light sensor and a proximity sensor, wherein the ambient light sensor may adjust the brightness of the display panel 5041 according to the brightness of the ambient light, and the proximity sensor may exit the display panel 5041 and / or backlighting.
  • the accelerometer sensor can detect the magnitude of acceleration in various directions (generally three axes), and can detect the magnitude and direction of gravity when it is stationary, and can be used for applications that recognize the posture of terminal equipment (such as horizontal and vertical screen switching, Related games, magnetometer attitude calibration), vibration recognition related functions (such as pedometer, tap), etc.
  • the terminal equipment other sensors such as gyroscope, geomagnetic sensor, barometer, hygrometer, thermometer, and infrared sensor can also be configured , which will not be repeated here.
  • the terminal device may include an acceleration sensor, a depth sensor, or a distance sensor.
  • the audio circuit 506, the speaker 5061, and the microphone 5062 can provide an audio interface between the user and the terminal device.
  • the audio circuit 506 can transmit the electrical signal converted from the received audio data to the loudspeaker 5061, and the loudspeaker 5061 converts it into a sound signal output; After being received, it is converted into audio data, and then the audio data is processed by the output processor 508, and then sent to, for example, another terminal device through the RF circuit 501, or the audio data is output to the memory 502 for further processing.
  • WiFi is a short-distance wireless transmission technology.
  • the terminal device can help users send and receive emails, browse web pages, and access streaming media, etc. It provides users with wireless broadband Internet access.
  • Fig. 5 shows a WiFi module 507, it can be understood that it is not an essential component of the terminal device, and can be completely omitted as required without changing the essence of the invention.
  • the processor 508 is the control center of the terminal equipment. It uses various interfaces and lines to connect various parts of the entire terminal equipment. By running or executing software programs and/or modules stored in the memory 502, and calling data stored in the memory 502 , execute various functions of the terminal equipment and process data, so as to monitor the terminal equipment as a whole.
  • the processor 508 may include one or more processing units; preferably, the processor 508 may integrate an application processor and a modem processor, wherein the application processor mainly processes the operating system, user interface and application programs, etc. , the modem processor mainly handles wireless communications. It can be understood that the foregoing modem processor may not be integrated into the processor 508 .
  • the terminal device also includes a power supply 509 (such as a battery) for supplying power to various components.
  • a power supply 509 (such as a battery) for supplying power to various components.
  • the power supply can be logically connected to the processor 508 through the power management system, so that functions such as charging, discharging, and power consumption management can be realized through the power management system.
  • the terminal device may also include a Bluetooth module, etc., which will not be repeated here.
  • the receiver 5011 is configured to receive a redirection message sent by the network device according to the service request after the terminal device initiates a call service request based on an evolved packet system fallback, and the redirection message is used to indicate that the The terminal device is redirected from the new air interface NR cell to the first long-term evolution LTE cell; the processor 508 is configured to switch from the NR cell to the first LTE cell when the first LTE cell is an abnormal cell and a normal second LTE cell is detected. The second LTE cell, so that the call is connected; wherein, the abnormal cell is a cell whose number of release data radio bearer DRB events occurs for a number of times greater than or equal to a number threshold.
  • the second LTE cell satisfies at least one of the following: adjacent to the first LTE cell; a cell with a reference signal received power RSRP greater than or equal to a power threshold; a reference signal received quality RSRQ greater than or equal to a quality threshold; signal and interference plus The noise ratio SINR is greater than or equal to the scale threshold.
  • the processor 508 is further configured to detect that the number of times the DRB release event occurs in the first LTE cell within the first period is greater than or equal to the number threshold before receiving the redirection message sent by the network device according to the service request In the case of marking the first LTE cell as an abnormal cell; it is also used to determine the first LTE cell when it is detected that the first LTE cell is marked as an abnormal cell after receiving the redirection message sent by the network device according to the service request.
  • the LTE cell is an abnormal cell.
  • the processor 508 is specifically configured to mark the first LTE cell as an abnormal cell by setting the priority of the first LTE cell to the lowest priority corresponding to the call; when it is detected that the priority of the first LTE cell is In the case of the lowest priority, it is determined that the first LTE cell is an abnormal cell.
  • the processor 508 is specifically configured to mark the first LTE cell as an abnormal cell by adding the first LTE cell to the blacklist corresponding to the call; when it is detected that the first LTE cell is a cell in the blacklist In this case, it is determined that the first LTE cell is an abnormal cell.
  • the processor 508 is specifically configured to mark the first LTE cell as an abnormal cell in the second period; and is also configured to cancel the marking process of the first LTE cell as an abnormal cell after the second period; wherein, the second period after the first cycle.
  • the event of releasing the DRB includes at least one of the following: releasing the DRB during the call establishment process corresponding to the call; releasing the DRB during the call establishment process of the LTE voice solution VoLTE.
  • the processor 508 is further configured to, after receiving the redirection message sent by the network device according to the service request, switch from the NR cell to the second cell when no normal LTE cell is detected but a 3G cell is detected.
  • An LTE cell switching from the first LTE cell to the 3G cell, so that the call is connected; when no normal LTE cell is detected, and a 3G cell is not detected, and a 2G cell is detected, the NR cell Handover to the first LTE cell, and handover from the first LTE cell to the 2G cell, so that the call is connected.
  • the processor 508 is further configured to switch from the NR cell to the first LTE cell if the first LTE cell is not an abnormal cell after receiving the redirection message sent by the network device according to the service request, to Make the call go through.
  • the embodiment of the present application also provides a terminal device, which may include: a memory storing executable program code; and a processor and a transceiver coupled to the memory; the processor invokes the executable program stored in the memory Code, when the executable program code is executed by the processor, the processor and the transceiver implement the various processes of the call processing method provided by the above method embodiment, and can achieve the same technical effect, to avoid repetition, no longer repeat.
  • a terminal device may include: a memory storing executable program code; and a processor and a transceiver coupled to the memory; the processor invokes the executable program stored in the memory Code, when the executable program code is executed by the processor, the processor and the transceiver implement the various processes of the call processing method provided by the above method embodiment, and can achieve the same technical effect, to avoid repetition, no longer repeat.
  • An embodiment of the present application provides a readable storage medium, on which a program or instruction is stored.
  • a program or instruction is stored.
  • each process of the call processing method provided by the above method embodiment is implemented, and the same To avoid repetition, the technical effects will not be repeated here.
  • the embodiment of the present application also provides a computer program product, wherein the computer program product includes computer instructions, and when the computer program product runs on the processor, the processor executes the computer instructions to implement the call provided by the above method embodiments.
  • the computer program product includes computer instructions
  • the processor executes the computer instructions to implement the call provided by the above method embodiments.
  • the embodiment of the present application further provides a chip, the chip includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the above-mentioned call processing method embodiment
  • the chip includes a processor and a communication interface
  • the communication interface is coupled to the processor
  • the processor is used to run programs or instructions to implement the above-mentioned call processing method embodiment
  • chips mentioned in the embodiments of the present application may also be called system-on-chip, system-on-chip, system-on-a-chip, or system-on-a-chip.
  • the disclosed system, device, server and method can be implemented in other ways.
  • the device embodiments 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 can be combined or May be integrated into another system, or some features may be ignored, or not implemented.
  • the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces, and the indirect coupling or communication connection of 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 may be distributed to multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.
  • each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist separately physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.
  • the integrated unit is realized in the form of a software function unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.
  • the technical solution of the present application is essentially or part of the contribution to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium , including several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disc, etc., which can store program codes. .

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Abstract

本申请实施例公开了一种呼叫处理方法、装置、终端设备及存储介质，属于通信技术领域，能够解决在基于演进分组系统回落的语音业务流程中因释放DRB导致通话失败的问题。该方法包括：在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，重定向消息用于指示该终端设备从NR小区重定向到第一LTE小区；在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。

Description

呼叫处理方法、装置、终端设备及存储介质
本申请要求于2021年08月10日提交中国专利局、申请号为202110915543.6、申请名称为“呼叫处理方法、装置、终端设备及存储介质”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
本申请涉及通信技术领域，尤其涉及一种呼叫处理方法、装置、终端设备及存储介质。
背景技术
目前，在第五代移动通信技术(5th Generation，5G)新空口(New Radio，NR)小区的语音业务可以通过演进分组系统回落(Evolved Packet System Fall Back，EPSFB)的方式承载到长期演进(Long Term Evolution，LTE)小区。
终端设备在NR小区基于EPSFB的语音业务流程为：终端设备向网络设备发送呼叫(Mobile originating call，Mo call)的服务请求(Service Request)，网络设备接收到该Service Request之后，向终端设备下发重定向消息，该重定向消息用于指示该终端设备从NR小区重定向到LTE小区，并向终端设备下发LTE重配置消息；终端设备切换(handover)到该LTE小区，该呼叫接通成功。
然而，有时网络设备下发的该LTE小区对应的重配置消息中将质量等级(Quality of Service Class Identifier，QCI)对应的数据无线承载(Data Radio Bearer，DRB)释放，而DRB释放会导致通话失败。
发明内容
本申请实施例提供了一种呼叫处理方法、装置、终端设备及存储介质，以解决在基于演进分组系统回落的语音业务流程中因释放DRB导致通话失败的问题。
本申请实施例的第一方面，提供一种呼叫处理方法，应用于终端设备，该方法包括：在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，重定向消息用于指示该终端设备从NR小区重定向到第一LTE小区；在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。
本申请实施例的第二方面，提供一种呼叫处理装置，该装置包括：接收模块和切换模块；该接收模块，用于在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，该重定向消息用于指示该终端设备从新空口NR小区重定向到第一长期演进LTE小区；该切换模块，用于在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放数据无线承载DRB事件的次数大于或等于次数阈值的小区。
本申请实施例的第三方面，提供一种终端设备，包括：存储有可执行程序代码的存储器；以及所述存储器耦合的处理器和收发器；所述处理器调用所述存储器中存储的所述可执行程序代码，所述可执行程序代码被所述处理器执行时，使得所述处理器和收发器实现如第一方面所述的呼叫处理方法的步骤。
本申请实施例的第四方面，提供一种可读存储介质，该可读存储介质上存储程序或指 令，该程序或指令被处理器执行时实现如第一方面所述的呼叫处理方法的步骤。
本申请实施例的第五方面，提供了一种芯片，该芯片包括处理器和通信接口，该通信接口和该处理器耦合，该处理器用于运行程序或指令，实现如第一方面所述的呼叫处理方法。
本申请实施例中，可以通过在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，重定向消息用于指示该终端设备从NR小区重定向到第一LTE小区；在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。本申请实施例中，在基于EPSFB的语音业务建立过程中，若第一LTE小区为异常小区(发生释放DRB事件的次数大于或等于次数阈值的小区)，则从NR小区切换到不是异常小区的第二LTE小区，从而可以保证不会因终端设备切换到释放DRB的小区(第一LTE小区)导致通话失败。
附图说明
为了更清楚地说明本申请实施例技术方案，下面将对实施例和现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施例，还可以根据这些附图获得其它的附图。
图1为本申请实施例提供的一种通信系统的架构示意图；
图2A为本申请实施例提供的呼叫处理方法的流程示意图之一；
图2B为本申请实施例提供的呼叫处理方法的流程示意图之二；
图2C为本申请实施例提供的呼叫处理方法的流程示意图之三；
图2D为本申请实施例提供的呼叫处理方法的流程示意图之四；
图2E为本申请实施例提供的呼叫处理方法的流程示意图之五；
图2F为本申请实施例提供的呼叫处理方法的流程示意图之六；
图3为本申请实施例提供的呼叫处理方法的流程示意图之七；
图4为本申请实施例提供的一种呼叫处理装置的结构框图；
图5为本申请实施例提供的一种终端设备的硬件结构示意图。
具体实施方式
下面将结合本申请实施例中的附图，对本申请实施例中的技术方案进行清楚地描述，显然，所描述的实施例是本申请一部分实施例，而不是全部的实施例。基于本申请中的实施例，本领域普通技术人员获得的所有其他实施例，都属于本申请保护的范围。
本申请的说明书和权利要求书中的术语“第一”、“第二”等是用于区别类似的对象，而不用于描述特定的顺序或先后次序。应该理解这样使用的数据在适当情况下可以互换，以便本申请的实施例能够以除了在这里图示或描述的那些以外的顺序实施，且“第一”、“第二”等所区分的对象通常为一类，并不限定对象的个数，例如第一对象可以是一个，也可以是多个。此外，说明书以及权利要求中“和/或”表示所连接对象的至少其中之一，字符“/”，一般表示前后关联对象是一种“或”的关系。
从4G LTE开始，语音业务实现方案就不再仅仅是2G/3G网络，单纯通过电路域网络提供如语音业务和其他增值业务，而是设计通过网络之间互连的协议(Internet Protocol，IP)多媒体子系统(IMS，IP Multimedia Subsystem)实现将语音业务承载在IP网络，也即LTE语音方案(Voice over LTE，VoLTE)的方式，实现将2G/3G电路域所有业务在4G网络全部“IP化”。4G网络的逐步部署扩展过程中，处于对网络发展的不同阶段及对语音 业务连续性的考虑，4G还提出了如电路域回落(CSFB，Circuit Switched Fallback)及单无线语音呼叫连续性(SRVCC，Single Radio Voice Call Continuity)等过渡方案。
5G NR语音方案设计，延续了4G LTE通过IP网络承载语音业务的方式，通过5G网络(无线网+核心网)和IMS系统承载语音业务，该种方式称为NR语音方案(Voice over NR，VoNR)。同样地，考虑到5G不同阶段部署规模不同，而4G网络已经广泛部署并可能在未来长期存在，以及对语音业务连续性保证的需求，回落方案设计也是十分必要的，因此演进分组系统回落方案也是5G语音方案的一种。这里EPSF主要指从5G回落到4G通过VoLTE的方式实现语音业务，但由于4G网络存在多种语音方案，当4G网络无线环境较差时，不可避免地，UE会通过如CSFB的方式，完成语音业务。
本申请实施例中，主要应用于5G语音方案中的演进分组系统回落方案。现有技术中，在基于演进分组系统回落方案的语音业务流程建立过程中，某些网络设备(例如海外网络设备)向终端设备发送重配置消息，在该重配置消息中网络设备会释放QCI(例如QCI为1)对应的DRB(例如DRB3)，当终端设备从NR小区切换到释放DRB的LTE小区后，在终端设备检测到DRB释放，且预设时长(例如6秒)内未重新建立的情况下，终端设备会主动向网络设备上报携带原因值为媒体承载丢失(Media bearer loss)的结束会话消息(BYE)，进而导致通话失败。基于此种原因，导致呼叫失败率升高。
因此，为了解决上述技术问题，本申请实施例中，可以通过在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，重定向消息用于指示该终端设备从NR小区重定向到第一LTE小区；在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。本申请实施例中，在基于EPSFB的语音业务建立过程中，若第一LTE小区为异常小区(发生释放DRB事件的次数大于或等于次数阈值的小区)，则从NR小区切换到不是异常小区的第二LTE小区，从而可以保证不会因终端设备切换到释放DRB的小区(第一LTE小区)导致通话失败。
图1示出本申请实施例可应用的一种无线通信系统的框图。无线通信系统包括终端设备11和至少两个网络设备12(图中以一个网络设备12示出)。其中，终端设备11也可以称作终端或者用户终端(User Equipment，UE)，终端设备11可以是手机、平板电脑(Tablet Personal Computer)、膝上型电脑(Laptop Computer)或称为笔记本电脑、个人数字助理(Personal Digital Assistant，PDA)、掌上电脑、上网本、超级移动个人计算机(ultra-mobile personal computer，UMPC)、移动上网装置(Mobile Internet Device，MID)、可穿戴式设备(Wearable Device)或车载设备(VUE)、行人终端(PUE)等终端侧设备，可穿戴式设备包括：智能手表、手环、耳机、眼镜等。需要说明的是，在本申请实施例并不限定终端设备11的具体类型。网络设备12可以是网络设备可以包括一个或多个接入网设备或核心网，其中，接入网设备可被称为基站、节点B、演进节点B、接入点、基收发机站(Base Transceiver Station，BTS)、无线电基站、无线电收发机、基本服务集(Basic Service Set，BSS)、扩展服务集(Extended Service Set，ESS)、B节点、演进型B节点(eNB)、家用B节点、家用演进型B节点、WLAN接入点、WiFi节点、发送接收点(Transmitting Receiving Point，TRP)、网络服务器(Network Server、NW)或所述领域中其他某个合适的术语，只要达到相同的技术效果，所述接入网设备不限于特定技术词汇，需要说明的是，在本申请实施例中仅以NR系统中的基站、LTE系统中基站等为例，但是并不限定具体类型。
下面结合附图，通过具体的实施例及其应用场景对本申请实施例提供的呼叫处理方法 进行详细地说明。
本申请实施例提供的呼叫处理方法的执行主体可以为上述的终端设备(包括移动终端设备和非移动终端设备)，也可以为该终端设备中能够实现该呼叫处理方法的功能模块和/或功能实体，具体的可以根据实际使用需求确定，本申请实施例不作限定。
本申请提供一种呼叫处理方法，应用于终端设备，所述方法包括：
在所述终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据所述服务请求发送的重定向消息，所述重定向消息用于指示所述终端设备从新空口NR小区重定向到第一LTE小区；
在所述第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从所述NR小区切换到所述第二LTE小区，以使得所述呼叫接通；
其中，所述异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。
可选的，所述接收网络设备根据所述服务请求发送的重定向消息之前，所述方法还包括：
检测到在第一周期内所述第一LTE小区发生所述释放DRB事件的次数大于或等于所述次数阈值的情况下，标记所述第一LTE小区为所述异常小区；
所述接收网络设备根据所述服务请求发送的重定向消息之后，所述方法还包括：
在检测到所述第一LTE小区被标记为所述异常小区的情况下，确定所述第一LTE小区为所述异常小区。
可选的，所述标记所述第一LTE小区为所述异常小区，包括：
通过将所述第一LTE小区的优先级设置为所述呼叫对应的最低优先级，标记所述第一LTE小区为所述异常小区；
所述在检测到所述第一LTE小区被标记为所述异常小区的情况下，确定所述第一LTE小区为所述异常小区，包括：
在检测到所述第一LTE小区的优先级为所述最低优先级的情况下，确定所述第一LTE小区为所述异常小区。
可选的，所述标记所述第一LTE小区为所述异常小区，包括：
通过将所述第一LTE小区加入所述呼叫对应的黑名单中，标记所述第一LTE小区为所述异常小区；
所述在检测到所述第一LTE小区被标记为所述异常小区的情况下，确定所述第一LTE小区为所述异常小区，包括：
在检测到所述第一LTE小区为所述黑名单中的小区的情况下，确定所述第一LTE小区为所述异常小区。
可选的，所述标记所述第一LTE小区为所述异常小区，包括：
在第二周期标记所述第一LTE小区为所述异常小区；
所述方法还包括：
在所述第二周期之后，取消所述第一LTE小区为所述异常小区的标记处理；
其中，所述第二周期在所述第一周期之后。
可选的，所述释放DRB事件包括以下至少一项：
在所述呼叫对应的通话建立过程中释放DRB；
在LTE语音方案VoLTE通话建立过程中释放DRB。
可选的，所述接收网络设备根据所述服务请求发送的重定向消息之后，所述方法还包括：
在未检测到正常的LTE小区，检测到3G小区的情况下，从所述NR小区切换到所述第 一LTE小区，从所述第一LTE小区切换到所述3G小区，以使得所述呼叫接通；
在未检测到正常的LTE小区，以及未检测到3G小区，检测到2G小区的情况下，从所述NR小区切换到所述第一LTE小区，从所述第一LTE小区切换到所述2G小区，以使得所述呼叫接通。
可选的，所述接收网络设备根据所述服务请求发送的重定向消息之后，所述方法还包括：
在所述第一LTE小区不是所述异常小区的情况下，从所述NR小区切换到所述第一LTE小区，以使得所述呼叫接通。
可选的，所述方法还包括：
当所述终端设备需要基于演进分组系统回落拨打电话时，向所述网络设备发起基于演进分组系统回落的呼叫的服务请求。
可选的，述第二LTE小区为未发生释放DRB事件的小区，或发生释放DRB事件的次数小于次数阈值的小区。
可选的，所述第二LTE小区满足以下至少一项：
与第一LTE小区相邻；参考信号接收功率RSRP大于或等于功率阈值；参考信号接收质量RSRQ大于或等于质量阈值；信号与干扰加噪声比SINR大于或等于比例阈值。
可选的，所述第二LTE小区满足以下至少一项：
与第一LTE小区相邻；参考信号接收功率RSRP最好；参考信号接收质量RSRQ最好；信号与干扰加噪声比SINR最好。
如图2A所示，本申请实施例提供一种呼叫处理方法。下面以执行主体为终端设备为例，对本申请实施例提供的呼叫处理方法进行示例性的说明。该方法可以包括下述的步骤201至步骤202。
201、在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，终端设备接收网络设备根据该服务请求发送的重定向消息。
其中，重定向消息用于指示该终端设备从NR小区重定向到第一LTE小区。
可以理解，当终端设备需要基于演进分组系统回落拨打电话时，终端设备向网络设备(例如NW)发起基于演进分组系统回落的呼叫的服务请求。网络设备接收该服务请求，并根据该服务请求生成重定向消息，然后向终端设备发送重定向消息，最后向终端设备发送重配置消息(重配置消息中可能释放DRB)。
需要说明的是，本申请实施例中，在终端设备切换到第一LTE小区之前，终端设备不能根据重配置消息获知网络设备是否释放DRB，在通话失败之后，才能获知是因为释放DRB导致的回话结束。
202、在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，终端设备从该NR小区切换到第二LTE小区，以使得该呼叫接通。
其中，异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。
可以理解，次数阈值可以根据实际使用情况确定，本申请实施例不做限定。例如，次数阈值可以为2。
可以理解，终端设备在每次检测到小区发生释放DRB事件，则为该小区记录一次释放DRB事件，设置计数器，累计该小区发生释放DRB事件的次数，当计数器记录发生释放DRB事件的次数大于或等于次数阈值时，设置该小区为异常小区。
可以理解，第一LTE小区为发生释放DRB事件的次数大于或等于次数阈值的小区，正常的第二LTE小区为未发生释放DRB事件的小区，或发生释放DRB事件的次数小于次数阈值的小区。终端设备接收到重定向消息后，根据重定向消息确定第一LTE小区，然后在第 一LTE小区为异常小区，且存在不是异常小区的第二LTE小区(且存在正常的LTE小区)的情况下，忽略该重定向消息，从NR小区切换到第二LTE小区，以使得该呼叫接通。
可选地，正常的第二LTE小区还可以满足(记为第一条件)以下至少一项：与第一LTE小区相邻；参考信号接收功率(Reference Signal Receiving Power，RSRP)大于或等于功率阈值的小区；参考信号接收质量(Reference Signal Receiving Quality，RSRQ)大于或等于质量阈值；信号与干扰加噪声比(Signal to Interference plus Noise Ratio，SINR)大于或等于比例阈值。
可以理解，功率阈值可以根据实际使用需求确定，本申请实施例不做限定。例如，功率阈值可以为-105dBm。
可以理解，质量阈值可以根据实际使用需求确定，本申请实施例不做限定。
可以理解，比例阈值可以根据实际使用需求确定，本申请实施例不做限定。
可以理解，第二LTE小区满足的条件可以根据实际使用需求确定，本申请实施例不做限定。
针对第二LTE小区，有以下几种情况：
可选地，第二LTE小区与第一LTE小区相邻。进一步可选地，第二LTE小区可以为与第一LTE小区相邻的小区中的任一个；第二LTE小区也可以为与第一LTE小区相邻的小区中的RSRP最好的。
可选地，第二LTE小区与第一LTE小区相邻，且第二LTE小区满足目标条件。进一步可选地，第二LTE小区可以为与第一LTE小区相邻，且第二LTE小区满足目标条件的小区中的任一个；第二LTE小区也可以为第一LTE小区相邻，且第二LTE小区满足目标条件的小区中RSRP最好的。
可选地，第二LTE小区满足目标条件。进一步可选地，第二LTE小区可以为满足目标条件的小区中的任一个；第二LTE小区可以为满足目标条件的小区中RSRP最好的。
可选地，第二LTE小区为满足上述条件中的LTE小区中的任一个。
可选地，第二LTE小区为满足上述条件中的LTE小区中RSRP最好的。
其中，目标条件包括以下至少一项：RSRP大于或等于功率阈值的小区；RSRQ大于或等于质量阈值；SINR大于或等于比例阈值。
针对目标条件，有以下几种情况：
可选地，目标条件可以包括RSRP大于或等于功率阈值的小区。
可选地，目标条件可以包括RSRQ大于或等于质量阈值。
可选地，目标条件可以包括SINR大于或等于比例阈值。
可选地，目标条件可以包括RSRP大于或等于功率阈值的小区，以及RSRQ大于或等于质量阈值。
可选地，目标条件可以包括RSRP大于或等于功率阈值的小区，以及SINR大于或等于比例阈值。
可选地，目标条件可以包括RSRQ大于或等于质量阈值，以及SINR大于或等于比例阈值。
可选地，目标条件可以包括RSRP大于或等于功率阈值的小区，RSRQ大于或等于质量阈值，以及SINR大于或等于比例阈值。
本申请实施例中，在第二LTE小区与第一LTE小区相邻时，第一LTE小区信号质量较好，在第二LTE满足目标条件时，第二LTE小区信号质量较好。
第二LTE小区信号质量较好，则可以保证通话过程中不会因信号质量差发生掉话，导致通话断开。
可选地，本申请实施例中，终端设备在检测到第一LTE小区发生释放DRB时间的次数大于或等于次数阈值的情况下，可以通过为第一LTE小区设置特定标识(例如特定优先级)来表征第一LTE小区为异常小区，也可以将第一LTE小区的小区信息(例如，身份信息(identification，ID)、频点信息等)加入黑名单来表征第一LTE小区为异常小区，也可以将第一LTE小区加入异常小区组来表征第一LTE小区为异常小区，还可以通过其他方式来表征第一LTE小区为异常小区，本申请实施例不做限定。
示例性地，结合图2A，如图2B所示，在上述步骤201之前，本申请实施例提供的呼叫处理方法还可以包括下述的步骤203，在上述步骤201之后，本申请实施例提供的呼叫处理方法还可以包括下述的步骤204。
203、检测到在第一周期内第一LTE小区发生该释放DRB事件的次数大于或等于该次数阈值的情况下，终端设备标记第一LTE小区为异常小区。
其中，第一周期的时长可以根据实际使用情况确定，本申请实施例不做限定。
本申请实施例中，终端设备可以通过目标方式标记第一LTE小区为异常小区。例如，终端设备可以通过降低第一LTE小区的优先级来标记第一LTE小区为异常小区，终端设备也可以通过将第一LTE小区加入黑名单中来标记第一LTE小区为异常小区，终端设备还可以通过其他方式来标记第一LTE小区为异常小区，本申请实施例不做限定。
204、在检测到第一LTE小区被标记为异常小区的情况下，终端设备确定第一LTE小区为异常小区。
可以理解，若在第一周期内第一LTE小区发生该释放DRB事件的次数大于或等于该次数阈值，则标记第一LTE小区为异常小区，在第一周期之后，若检测到第一LTE小区被标记为异常小区，则确定第一LTE小区为异常小区。
本申请实施例中，通过将标记第一LTE小区为异常小区的条件设置为在第一周期内第一LTE小区发生该释放DRB事件的次数大于或等于该次数阈值，可以避免第一LTE小区在很长时间内多次偶然发生释放DRB事件(或因其他原因释放DRB)而被标记为异常小区，从而终端设备不能切换到实际上正常的第一LTE小区上，以影响通话的正常建立。
可选地，结合图2B，如图2C所示，上述步骤203具体可以通过下述步骤203a实现，上述步骤204具体可以通过下述步骤204a实现。
203a、终端设备通过将第一LTE小区的优先级设置为该呼叫对应的最低优先级，标记第一LTE小区为异常小区。
204a、在检测到第一LTE小区的优先级为该最低优先级的情况下，终端设备确定第一LTE小区为异常小区。
可以理解，该最低优先级对应的小区为在第一周期内发生该释放DRB事件的次数大于或等于该次数阈值的小区。不是最低优先级的小区不是在第一周期内发生该释放DRB事件的次数大于或等于该次数阈值的小区。最低优先级的LTE小区比其他优先级低的LTE小区的优先级都低，是异常小区的优先级。
本申请实施例中，通过将第一LTE小区的优先级降低为最低优先级的方式，标记第一小区为异常小区，从而在检测到第一LTE小区的优先级为最低优先级的情况下，确定第一LTE小区是异常小区，可以简化确定第一LTE小区是否是异常小区的过程，可以提高确定第一LTE小区是否是异常小区的效率，而且可以节约耗电。
可选地，结合图2B，如图2D所示，上述步骤203具体可以通过下述步骤203b实现，上述步骤204具体可以通过下述步骤204b实现。
203b、终端设备通过将第一LTE小区加入该呼叫对应的黑名单中，标记第一LTE小区为异常小区。
204b、在检测到第一LTE小区为该黑名单中的小区的情况下，终端设备确定第一LTE小区为异常小区。
可以理解，该黑名单中的小区为在第一周期内发生该释放DRB事件的次数大于或等于该次数阈值的小区。
本申请实施例中，通过将第一LTE小区加入黑名单中的方式，标记第一小区为异常小区，从而在检测到第一LTE小区是黑名单中的小区的情况下，确定第一LTE小区是常小区，可以简化确定第一LTE小区是否是异常小区的过程，可以提高确定第一LTE小区是否是异常小区的效率，而且可以节约耗电。
可选地，本申请实施例中，可以在小区在第一周期内发生释放DRB事件的次数大于或等于次数阈值的情况下，标记小区为异常小区。也可以在小区在第一周期内发生释放DRB事件的次数大于或等于次数阈值的情况下，标记小区在第二周期内为异常小区，并在第二周期之后，取消小区为异常小区的标记处理。那么，若检测到重定向消息指示的小区被标记为异常小区，则确定小区为异常小区；若检测到重定向消息指示的小区未被标记为异常小区，则确定小区为正常小区。
可选地，结合图2B，如图2E所示，上述步骤203具体可以通过下述步骤203c实现，在上述步骤202之后，本申请实施例提供的呼叫处理方法还可以包括下述的步骤205。
203c、终端设备在第二周期标记第一LTE小区为异常小区。
205、终端设备在第二周期之后，取消第一LTE小区为异常小区的标记处理。
其中，第二周期在第一周期之后。第二周期的时长可以根据实际使用情况确定，本申请实施例不做限定。
可以理解，异常小区即为在第一周期内发生释放DRB事件的次数大于或等于次数阈值的小区，所述第一周期为在当前时刻(接收到重定向消息)之前，距当前时刻的时长小于或等于目标时长的时间段，所述目标时长为第二周期的时长。
本申请实施例中，终端设备可以设置一个定时器，定时时长可以为第二周期的时长，在定时器超时之前，第一LTE小区被标记为异常小区；在定时器超时之后，取消第一LTE小区为异常小区的标记处理；在定时器超时之后，终端设备第一LTE小区设置为正常小区，不再被标记为异常小区。
取消第一LTE小区为异常小区的标记处理，可以理解，在第二周期之后，终端设备可以取消最低优先级的设置，从黑名单中删除第一LTE小区的信息。
本申请实施例中，在第二周期标记第一LTE小区为异常小区，在第二周期之后取消第一LTE小区为异常小区标记处理，是因为第一LTE小区可能在修复，当其修复好之后，就不会发生释放DRB事件，从而就无需被标记其为异常小区，当接收到上述重定向消息时，终端设备可以及时切换到第一LTE小区上，从而可以避免影响通话的正常建立。
可选地，该释放DRB事件包括以下至少一项：在该呼叫对应的通话建立过程中释放DRB；在LTE语音方案(Voice over LTE，VoLTE)通话建立过程中释放DRB。
可以理解，在该呼叫对应的通话建立过程中释放DRB，即为在基于EPSFB的语音业务的通话建立过程的重配置消息中释放DRB。
一种可能的情况，释放DRB事件为在该呼叫对应的通话建立过程中释放DRB。
一种可能的情况，释放DRB事件为在VoLTE通话建立过程中释放DRB。
另一种可能的情况，释放DRB事件包括：在该呼叫对应的通话建立过程中释放DRB，以及在VoLTE通话建立过程中释放DRB。可以理解，每检测到在该呼叫对应的通话建立过程中释放DRB，计数一次释放DRB事件，每检测到在VoLTE通话建立过程中释放DRB，也计数一次释放DRB事件。
本申请实施例中，提供了多种可能的释放DRB事件，实际使用中可根据情况确定最合适的释放DRB事件。
可选地，结合图2A，如图2F所示，本申请实施例提供的呼叫处理方法还可以包括下述的步骤206至步骤207。
206、在未检测到正常的LTE小区，检测到3G小区的情况下，终端设备从该NR小区切换到第一LTE小区，从第一LTE小区切换到该3G小区，以使得该呼叫接通。
本申请实施例中，若不存在不是异常小区的LTE小区，存在合适的3G小区，则先从NR小区切换到第一LTE小区，再从第一LTE小区切换到该3G小区，可以保证该呼叫接通，可以解决若切换到第一LTE小区，因释放DRB导致通话失败的问题。
207、在未检测到正常的LTE小区，以及未检测到3G小区，检测到2G小区的情况下，终端设备从该NR小区切换到第一LTE小区，从第一LTE小区切换到该2G小区，以使得该呼叫接通。
本申请实施例中，若不存在不是异常小区的LTE小区(即所有LTE小区都为异常小区)，且不存在合适的3G小区，但存在合适的2G小区，则先从NR小区切换到第一LTE小区，再从第一LTE小区切换到该2G小区，可以保证该呼叫接通，可以解决若切换到第一LTE小区，因释放DRB导致通话失败的问题。
需要说明的是，在发起基于EPSFB的呼叫的服务请求时，网络设备为NR小区对应的网络设备；在接收重定向消息和重配置消息时，网络设备为第一LTE小区对应的网络设备；在切换到第二LTE小区时，网络设备为第二LTE小区对应的网络设备；在切换到3G小区时，网络设备为3G小区对应的网络设备；在切换到2G小区时，网络设备为2G小区对应的网络设备。上述的网络设备可以相同，也可以不相同，本申请实施例不做限定。
本申请实施例中，在发起上述服务请求之后，通话结束之前，终端设备若接收到指示终端设备重定向到NR小区的重定向消息1，则终端设备可以忽略上述重定向消息1。在通话结束之后，若接收到上述重定向消息1，则终端设备可以根据上述重定向消息1，切换到NR小区。如此可以避免在通话结束之前，终端设备根据该重定向消息1重定向到NR小区，而导致通话失败的问题。
可选地，在上述步骤201之后，本申请实施例提供的呼叫处理方法还可以包括下述的步骤208。
208、在第一LTE小区不是异常小区的情况下，终端设备从该NR小区切换到第一LTE小区，以使得该呼叫接通。
可以理解，在第一LTE小区不是异常小区，终端设备从该NR小区切换到第一LTE小区，则终端设备在第一LTE小区下VoLTE快速接通成功。
结合图3所示，本申请实施例提供的呼叫处理方法具体可以通过下述步骤301至步骤309实现。
301、在该终端设备发起基于EPSFB的呼叫的服务请求之后，终端设备接收网络设备根据该服务请求发送的重定向消息。
302、终端设备确定第一LTE小区是否是异常小区。
若第一LTE小区是异常小区，则执行下述的步骤303；若第一LTE小区不是异常小区，则执行下述的步骤309。
303、终端设备检测是否存在正常的第二LTE小区。
若存在不是异常小区的第二LTE小区，则执行下述步骤304；若不存在不是异常小区的第二LTE小区，则执行下述的步骤305。
304、终端设备从NR小区切换到第二LTE小区，以使得该呼叫接通。
305、终端设备检测是否存在3G小区。
若存在3G小区，则执行下述步骤306；若不存在执行下述步骤307。
306、终端设备从NR小区切换到第一LTE小区，再从第一LTE小区切换到3G小区，以使得该呼叫接通。
307、终端设备检测是否存在2G小区。
若存在2G小区，则执行下述步骤308。
308、终端设备从NR小区切换到第一LTE小区，再从第一LTE小区切换到2G小区，以使得该呼叫接通。
309、终端设备从NR小区切换到第一LTE小区。
对上述步骤301至步骤309的描述可以参考上述步骤201至步骤208的相关描述，此处不予赘述。
图4为本申请实施例示出的一种呼叫处理装置的结构框图，如图4所示，包括：接收模块401和切换模块402；该接收模块401，用于在该终端设备发起基于演进分组系统回落EPSFB的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，该重定向消息用于指示该终端设备从新空口NR小区重定向到第一长期演进LTE小区；该切换模块402，用于在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放数据无线承载DRB事件的次数大于或等于次数阈值的小区。
可选地，第二LTE小区满足以下至少一项：与第一LTE小区相邻；参考信号接收功率RSRP大于或等于功率阈值的小区；参考信号接收质量RSRQ大于或等于质量阈值；信号与干扰加噪声比SINR大于或等于比例阈值。
可选地，该呼叫处理装置还包括：标记模块和确定模块；该标记模块，用于在接收网络设备根据该服务请求发送的重定向消息之前，检测到在第一周期内第一LTE小区发生该释放DRB事件的次数大于或等于该次数阈值的情况下，标记第一LTE小区为异常小区；该确定模块，用于在接收网络设备根据该服务请求发送的重定向消息之后，在检测到第一LTE小区被标记为异常小区的情况下，确定第一LTE小区为异常小区。
可选地，该标记模块，具体用于通过将第一LTE小区的优先级设置为该呼叫对应的最低优先级，标记第一LTE小区为异常小区；该确定模块，具体用于在检测到第一LTE小区的优先级为该最低优先级的情况下，确定第一LTE小区为异常小区。
可选地，该标记模块，具体用于通过将第一LTE小区加入该呼叫对应的黑名单中，标记第一LTE小区为异常小区；该确定模块，具体用于在检测到第一LTE小区为该黑名单中的小区的情况下，确定第一LTE小区为异常小区。
可选地，该标记模块，具体用于在第二周期标记第一LTE小区为异常小区；还用于在第二周期之后，取消第一LTE小区为异常小区的标记处理；其中，第二周期在第一周期之后。
可选地，该释放DRB事件包括以下至少一项：在该呼叫对应的通话建立过程中释放DRB；在LTE语音方案VoLTE通话建立过程中释放DRB。
可选地，该切换模块402，还用于在接收网络设备根据该服务请求发送的重定向消息之后，在未检测到正常的LTE小区，检测到3G小区的情况下，从该NR小区切换到第一LTE小区，从第一LTE小区切换到该3G小区，以使得该呼叫接通；在未检测到正常的LTE小区，以及未检测到3G小区，检测到2G小区的情况下，从该NR小区切换到第一LTE小区，从第一LTE小区切换到该2G小区，以使得该呼叫接通。
可选地，该切换模块402，还用于在接收网络设备根据该服务请求发送的重定向消息 之后，在第一LTE小区不是异常小区的情况下，从该NR小区切换到第一LTE小区，以使得该呼叫接通。
本申请实施例中，各模块可以实现上述方法实施例提供的呼叫处理方法，且能达到相同的技术效果，为避免重复，这里不再赘述。
图5为实现本申请各个实施例的一种终端设备的硬件结构示意图，如图5所示，该终端设备包括但不限于：射频(radio frequency，RF)电路501、存储器502、输入单元503、显示单元504、传感器505、音频电路506、无线通信(wireless fidelity，WiFi)模块507、处理器508、电源509、以及摄像头510等部件。其中，射频电路501包括接收器5011和发送器5012。本领域技术人员可以理解，图5中示出的终端设备结构并不构成对终端设备的限定，可以包括比图示更多或更少的部件，或者组合某些部件，或者不同的部件布置。
RF电路501可用于收发信息或通话过程中，信号的接收和发送，特别地，将基站的下行信息接收后，给处理器508处理；另外，将设计上行的数据发送给基站。通常，RF电路501包括但不限于天线、至少一个放大器、收发信机、耦合器、低噪声放大器(low noise amplifier，LNA)、双工器等。此外，RF电路501还可以通过无线通信与网络和其他设备通信。上述无线通信可以使用任一通信标准或协议，包括但不限于全球移动通讯系统(global system of mobile communication，GSM)、通用分组无线服务(general packet radio service，GPRS)、码分多址(code division multiple access，CDMA)、宽带码分多址(wideband code division multiple access，WCDMA)、长期演进(long term evolution，LTE)、电子邮件、短消息服务(short messaging service，SMS)等。
存储器502可用于存储软件程序以及模块，处理器508通过运行存储在存储器502的软件程序以及模块，从而执行终端设备的各种功能应用以及数据处理。存储器502可主要包括存储程序区和存储数据区，其中，存储程序区可存储操作系统、至少一个功能所需的应用程序(比如声音播放功能、图像播放功能等)等；存储数据区可存储根据终端设备的使用所创建的数据(比如音频数据、电话本等)等。此外，存储器502可以包括高速随机存取存储器，还可以包括非易失性存储器，例如至少一个磁盘存储器件、闪存器件、或其他易失性固态存储器件。
输入单元503可用于接收输入的数字或字符信息，以及产生与终端设备的用户设置以及功能控制有关的键信号输入。具体地，输入单元503可包括触控面板5031以及其他输入设备5032。触控面板5031，也称为触摸屏，可收集用户在其上或附近的触摸操作(比如用户使用手指、触笔等任何适合的物体或附件在触控面板5031上或在触控面板5031附近的操作)，并根据预先设定的程式驱动相应的连接装置。可选地，触控面板5031可包括触摸检测装置和触摸控制器两个部分。其中，触摸检测装置检测用户的触摸方位，并检测触摸操作带来的信号，将信号传送给触摸控制器；触摸控制器从触摸检测装置上接收触摸信息，并将它转换成触点坐标，再送给处理器508，并能接收处理器508发来的命令并加以执行。此外，可以采用电阻式、电容式、红外线以及表面声波等多种实现触控面板5031。除了触控面板5031，输入单元503还可以包括其他输入设备5032。具体地，其他输入设备5032可以包括但不限于物理键盘、功能键(比如音量控制按键、开关按键等)、轨迹球、鼠标、操作杆等中的一种或多种。
显示单元504可用于显示由用户输入的信息或提供给用户的信息以及终端设备的各种菜单。显示单元504可包括显示面板5041，可选地，可以采用液晶显示器(liquid crystal display，LCD)、有机发光二极管(organic light-Emitting diode，OLED)等形式来配置显示面板5041。进一步的，触控面板5031可覆盖显示面板5041，当触控面板5031检测到在其上或附近的触摸操作后，传送给处理器508以确定触摸事件的，随后处理器508根据 触摸事件的在显示面板5041上提供相应的视觉输出。虽然在图5中，触控面板5031与显示面板5041是作为两个独立的部件来实现终端设备的输入和输入功能，但是在某些实施例中，可以将触控面板5031与显示面板5041集成而实现终端设备的输入和输出功能。
终端设备还可包括至少一种传感器505，比如光传感器、运动传感器以及其他传感器。具体地，光传感器可包括环境光传感器及接近传感器，其中，环境光传感器可根据环境光线的明暗来调节显示面板5041的亮度，接近传感器可在终端设备移动到耳边时，退出显示面板5041和/或背光。作为运动传感器的一种，加速计传感器可检测各个方向上(一般为三轴)加速度的大小，静止时可检测出重力的大小及方向，可用于识别终端设备姿态的应用(比如横竖屏切换、相关游戏、磁力计姿态校准)、振动识别相关功能(比如计步器、敲击)等；至于终端设备还可配置的陀螺仪、地磁传感器、气压计、湿度计、温度计、红外线传感器等其他传感器，在此不再赘述。本申请实施例中，该终端设备可以包括加速度传感器、深度传感器或者距离传感器等。
音频电路506、扬声器5061，传声器5062可提供用户与终端设备之间的音频接口。音频电路506可将接收到的音频数据转换后的电信号，传输到扬声器5061，由扬声器5061转换为声音信号输出；另一方面，传声器5062将收集的声音信号转换为电信号，由音频电路506接收后转换为音频数据，再将音频数据输出处理器508处理后，经RF电路501以发送给比如另一终端设备，或者将音频数据输出至存储器502以便进一步处理。
WiFi属于短距离无线传输技术，终端设备通过WiFi模块507可以帮助用户收发电子邮件、浏览网页和访问流式媒体等，它为用户提供了无线的宽带互联网访问。虽然图5示出了WiFi模块507，但是可以理解的是，其并不属于终端设备的必须构成，完全可以根据需要在不改变发明的本质的范围内而省略。
处理器508是终端设备的控制中心，利用各种接口和线路连接整个终端设备的各个部分，通过运行或执行存储在存储器502内的软件程序和/或模块，以及调用存储在存储器502内的数据，执行终端设备的各种功能和处理数据，从而对终端设备进行整体监控。可选地，处理器508可包括一个或多个处理单元；优选的，处理器508可集成应用处理器和调制解调处理器，其中，应用处理器主要处理操作系统、用户界面和应用程序等，调制解调处理器主要处理无线通信。可以理解的是，上述调制解调处理器也可以不集成到处理器508中。
终端设备还包括给各个部件供电的电源509(比如电池)，优选的，电源可以通过电源管理系统与处理器508逻辑相连，从而通过电源管理系统实现管理充电、放电、以及功耗管理等功能。尽管未示出，终端设备还可以包括蓝牙模块等，在此不再赘述。
本申请实施例中，接收器5011，用于在该终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据该服务请求发送的重定向消息，该重定向消息用于指示该终端设备从新空口NR小区重定向到第一长期演进LTE小区；处理器508，用于在第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从该NR小区切换到第二LTE小区，以使得该呼叫接通；其中，异常小区为发生释放数据无线承载DRB事件的次数大于或等于次数阈值的小区。
可选地，第二LTE小区满足以下至少一项：与第一LTE小区相邻；参考信号接收功率RSRP大于或等于功率阈值的小区；参考信号接收质量RSRQ大于或等于质量阈值；信号与干扰加噪声比SINR大于或等于比例阈值。
可选地，处理器508，还用于在接收网络设备根据该服务请求发送的重定向消息之前，检测到在第一周期内第一LTE小区发生该释放DRB事件的次数大于或等于该次数阈值的情况下，标记第一LTE小区为异常小区；还用于在接收网络设备根据该服务请求发送的重定 向消息之后，在检测到第一LTE小区被标记为异常小区的情况下，确定第一LTE小区为异常小区。
可选地，处理器508，具体用于通过将第一LTE小区的优先级设置为该呼叫对应的最低优先级，标记第一LTE小区为异常小区；在检测到第一LTE小区的优先级为该最低优先级的情况下，确定第一LTE小区为异常小区。
可选地，处理器508，具体用于通过将第一LTE小区加入该呼叫对应的黑名单中，标记第一LTE小区为异常小区；在检测到第一LTE小区为该黑名单中的小区的情况下，确定第一LTE小区为异常小区。
可选地，处理器508，具体用于在第二周期标记第一LTE小区为异常小区；还用于在第二周期之后，取消第一LTE小区为异常小区的标记处理；其中，第二周期在第一周期之后。
可选地，该释放DRB事件包括以下至少一项：在该呼叫对应的通话建立过程中释放DRB；在LTE语音方案VoLTE通话建立过程中释放DRB。
可选地，处理器508，还用于在接收网络设备根据该服务请求发送的重定向消息之后，在未检测到正常的LTE小区，检测到3G小区的情况下，从该NR小区切换到第一LTE小区，从第一LTE小区切换到该3G小区，以使得该呼叫接通；在未检测到正常的LTE小区，以及未检测到3G小区，检测到2G小区的情况下，从该NR小区切换到第一LTE小区，从第一LTE小区切换到该2G小区，以使得该呼叫接通。
可选地，处理器508，还用于在接收网络设备根据该服务请求发送的重定向消息之后，在第一LTE小区不是异常小区的情况下，从该NR小区切换到第一LTE小区，以使得该呼叫接通。
本实施例中各种实现方式具有的有益效果具体可以参见上述呼叫处理方法实施例中相应实现方式所具有的有益效果，为避免重复，此处不再赘述。
本申请实施例还提供一种终端设备，该终端设备可以包括：存储有可执行程序代码的存储器；以及该存储器耦合的处理器和收发器；该处理器调用该存储器中存储的该可执行程序代码，该可执行程序代码被该处理器执行时，使得该处理器和收发器实现上述方法实施例提供的呼叫处理方法的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例提供一种可读存储介质，该可读存储介质上存储程序或指令，该程序或指令被处理器执行时实现上述方法实施例提供的呼叫处理方法的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例还提供一种计算机程序产品，其中，该计算机程序产品包括计算机指令，当该计算机程序产品在处理器上运行时，使得处理器执行该计算机指令，实现上述方法实施例提供的呼叫处理方法的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
本申请实施例另提供了一种芯片，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现上述呼叫处理方法实施例的各个过程，且能达到相同的技术效果，为避免重复，这里不再赘述。
应理解，本申请实施例提到的芯片还可以称为系统级芯片、系统芯片、芯片系统或片上系统芯片等。
在本申请所提供的几个实施例中，应该理解到，所揭露的系统，装置，服务器和方法，可以通过其它的方式实现。例如，以上所描述的装置实施例仅仅是示意性的，例如，所述单元的划分，仅仅为一种逻辑功能划分，实际实现时可以有另外的划分方式，例如多个单 元或组件可以结合或者可以集成到另一个系统，或一些特征可以忽略，或不执行。另一点，所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口，装置或单元的间接耦合或通信连接，可以是电性，机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的，作为单元显示的部件可以是或者也可以不是物理单元，即可以位于一个地方，或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外，在本申请各个实施例中的各功能单元可以集成在一个处理单元中，也可以是各个单元单独物理存在，也可以两个或两个以上单元集成在一个单元中。上述集成的单元既可以采用硬件的形式实现，也可以采用软件功能单元的形式实现。
所述集成的单元如果以软件功能单元的形式实现并作为独立的产品销售或使用时，可以存储在一个计算机可读取存储介质中。基于这样的理解，本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的全部或部分可以以软件产品的形式体现出来，该计算机软件产品存储在一个存储介质中，包括若干指令用以使得一台计算机设备(可以是个人计算机，服务器，或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括：U盘、移动硬盘、只读存储器(ROM，Read-Only Memory)、随机存取存储器(RAM，Random Access Memory)、磁碟或者光盘等各种可以存储程序代码的介质。
以上所述，以上实施例仅用以说明本申请的技术方案，而非对其限制；尽管参照前述实施例对本申请进行了详细的说明，本领域的普通技术人员应当理解：其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换；而这些修改或者替换，并不使相应技术方案的本质脱离本申请各实施例技术方案的精神和范围。

Claims (16)

  1. 一种呼叫处理方法，其特征在于，应用于终端设备，所述方法包括：
    在所述终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据所述服务请求发送的重定向消息，所述重定向消息用于指示所述终端设备从新空口NR小区重定向到第一LTE小区；
    在所述第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从所述NR小区切换到所述第二LTE小区，以使得所述呼叫接通；
    其中，所述异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。
  2. 根据权利要求1所述的方法，其特征在于，所述接收网络设备根据所述服务请求发送的重定向消息之前，所述方法还包括：
    检测到在第一周期内所述第一LTE小区发生所述释放DRB事件的次数大于或等于所述次数阈值的情况下，标记所述第一LTE小区为所述异常小区；
    所述接收网络设备根据所述服务请求发送的重定向消息之后，所述方法还包括：
    在检测到所述第一LTE小区被标记为所述异常小区的情况下，确定所述第一LTE小区为所述异常小区。
  3. 根据权利要求2所述的方法，其特征在于，所述标记所述第一LTE小区为所述异常小区，包括：
    通过将所述第一LTE小区的优先级设置为所述呼叫对应的最低优先级，标记所述第一LTE小区为所述异常小区；
    所述在检测到所述第一LTE小区被标记为所述异常小区的情况下，确定所述第一LTE小区为所述异常小区，包括：
    在检测到所述第一LTE小区的优先级为所述最低优先级的情况下，确定所述第一LTE小区为所述异常小区。
  4. 根据权利要求2所述的方法，其特征在于，所述标记所述第一LTE小区为所述异常小区，包括：
    通过将所述第一LTE小区加入所述呼叫对应的黑名单中，标记所述第一LTE小区为所述异常小区；
    所述在检测到所述第一LTE小区被标记为所述异常小区的情况下，确定所述第一LTE小区为所述异常小区，包括：
    在检测到所述第一LTE小区为所述黑名单中的小区的情况下，确定所述第一LTE小区为所述异常小区。
  5. 根据权利要求2至4中任一项所述的方法，其特征在于，所述标记所述第一LTE小区为所述异常小区，包括：
    在第二周期标记所述第一LTE小区为所述异常小区；
    所述方法还包括：
    在所述第二周期之后，取消所述第一LTE小区为所述异常小区的标记处理；
    其中，所述第二周期在所述第一周期之后。
  6. 根据权利要求1至5中任一项所述的方法，其特征在于，所述释放DRB事件包括以下至少一项：
    在所述呼叫对应的通话建立过程中释放DRB；
    在LTE语音方案VoLTE通话建立过程中释放DRB。
  7. 根据权利要求1至6中任一项所述的方法，其特征在于，所述接收网络设备根据所述服务请求发送的重定向消息之后，所述方法还包括：
    在未检测到正常的LTE小区，检测到3G小区的情况下，从所述NR小区切换到所述第一LTE小区，从所述第一LTE小区切换到所述3G小区，以使得所述呼叫接通；
    在未检测到正常的LTE小区，以及未检测到3G小区，检测到2G小区的情况下，从所述NR小区切换到所述第一LTE小区，从所述第一LTE小区切换到所述2G小区，以使得所述呼叫接通。
  8. 根据权利要求1至7中任一项所述的方法，其特征在于，所述接收网络设备根据所述服务请求发送的重定向消息之后，所述方法还包括：
    在所述第一LTE小区不是所述异常小区的情况下，从所述NR小区切换到所述第一LTE小区，以使得所述呼叫接通。
  9. 根据权利要求1-8中任一项所述的方法，其特征在于，所述方法还包括：
    当所述终端设备需要基于演进分组系统回落拨打电话时，向所述网络设备发起基于演进分组系统回落的呼叫的服务请求。
  10. 根据权利要求1-9中任一项所述的方法，其特征在于，所述第二LTE小区为未发生释放DRB事件的小区，或发生释放DRB事件的次数小于次数阈值的小区。
  11. 根据权利要求10所述的方法，其特征在于，所述第二LTE小区满足以下至少一项：
    与第一LTE小区相邻；参考信号接收功率RSRP大于或等于功率阈值；参考信号接收质量RSRQ大于或等于质量阈值；信号与干扰加噪声比SINR大于或等于比例阈值。
  12. 根据权利要求10所述的方法，其特征在于，所述第二LTE小区满足以下至少一项：
    与第一LTE小区相邻；参考信号接收功率RSRP最好；参考信号接收质量RSRQ最好；信号与干扰加噪声比SINR最好。
  13. 一种呼叫处理装置，其特征在于，所述装置包括：接收模块和切换模块；
    所述接收模块，用于在所述终端设备发起基于演进分组系统回落的呼叫的服务请求之后，接收网络设备根据所述服务请求发送的重定向消息，所述重定向消息用于指示所述终端设备从新空口NR小区重定向到第一LTE小区；
    所述切换模块，用于在所述第一LTE小区为异常小区，且检测到正常的第二LTE小区的情况下，从所述NR小区切换到所述第二LTE小区，以使得所述呼叫接通；
    其中，所述异常小区为发生释放DRB事件的次数大于或等于次数阈值的小区。
  14. 一种终端设备，其特征在于，包括：
    存储有可执行程序代码的存储器；
    以及所述存储器耦合的处理器和收发器；
    所述处理器调用所述存储器中存储的所述可执行程序代码，所述可执行程序代码被所述处理器执行时，使得所述处理器和收发器实现如权利要求1至12中任一项所述的呼叫处理方法的步骤。
  15. 一种可读存储介质，其特征在于，所述可读存储介质上存储程序或指令，所述程序或指令被处理器执行时实现如权利要求1至12中任一项所述的呼叫处理方法的步骤。
  16. 一种芯片，其特征在于，所述芯片包括处理器和通信接口，所述通信接口和所述处理器耦合，所述处理器用于运行程序或指令，实现如权利要求1至12中任一项所述的呼叫处理方法的步骤。
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