WO2025123716A1 - 小区接入方法、电子设备和芯片系统 - Google Patents

小区接入方法、电子设备和芯片系统 Download PDF

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Publication number
WO2025123716A1
WO2025123716A1 PCT/CN2024/110247 CN2024110247W WO2025123716A1 WO 2025123716 A1 WO2025123716 A1 WO 2025123716A1 CN 2024110247 W CN2024110247 W CN 2024110247W WO 2025123716 A1 WO2025123716 A1 WO 2025123716A1
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WIPO (PCT)
Prior art keywords
cell
electronic device
signal strength
message
target
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PCT/CN2024/110247
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English (en)
French (fr)
Inventor
李海波
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Honor Device Co Ltd
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Honor Device Co Ltd
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0055—Transmission or use of information for re-establishing the radio link
    • H04W36/0058—Transmission of hand-off measurement information, e.g. measurement reports
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • 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 field of communication technology, and in particular to a cell access method, electronic equipment and chip system.
  • UE When user equipment (UE) supports the fifth generation mobile networks (5G) standard, the UE usually resides on the 5G network. In this case, if the UE does not support voice over new radio (VONR) calls, the UE needs to use the evolved packet system fallback (EPSFB) technology to fall back from the 5G network to the fourth generation mobile networks (4G) network to use voice over long term evolution (VOLTE) calls.
  • VONR voice over new radio
  • EPSFB evolved packet system fallback
  • 4G fourth generation mobile networks
  • VOLTE voice over long term evolution
  • the 5G cell that the UE is currently connected to sends a measurement configuration message to the UE.
  • the UE measures the signal strength of one or more 4G cells and reports it to the 5G cell.
  • the 5G cell selects a 4G cell from the one or more 4G cells based on their signal strengths, and sends a handover command to the UE to instruct the UE to switch to this 4G cell.
  • the UE accesses the 4G cell and performs a tracking area update (TAU) to implement the EPSFB process.
  • TAU tracking area update
  • the embodiments of the present application provide a cell access method, an electronic device, and a chip system, which can improve the success rate of the network fallback process.
  • a cell access method In the first aspect, a cell access method is provided.
  • an electronic device receives a measurement configuration message sent by a first cell, and the measurement configuration message is used to indicate the measurement of the signal strength of a neighboring cell of a different system.
  • the electronic device measures the signal strength and signal quality of a second cell.
  • the electronic device processes the signal strength of one or more second cells according to the signal quality of the one or more second cells measured within the first preset time duration to obtain a target signal strength of the one or more second cells.
  • the electronic device sends a measurement report message to the first cell, and the measurement report message includes the target signal strength of the second cell whose target signal strength in the one or more second cells is higher than a signal strength threshold.
  • the electronic device receives a switching command sent by the first cell, it accesses a second cell indicated by the switching command.
  • the second cell is a neighboring cell of a different system of the first cell.
  • the mobile communication technology standards supported by the first cell and the second cell are different.
  • the mobile communication technology standard supported by the first cell (which may be referred to as the first mobile communication technology standard) is higher than the mobile communication technology standard supported by the second cell (which may be referred to as the second mobile communication technology standard).
  • the first cell supports the 5G standard
  • the second cell supports the 4G standard.
  • the first cell supports the 4G standard
  • the second cell 300 supports the 3G standard.
  • the network based on the first mobile communication technology standard is referred to as the first network
  • the network based on the 4G standard is referred to as the second network.
  • the network of the second mobile communication technical standard is referred to as the second network.
  • the signal strength of a cell in the present application may be the RSRP of the cell.
  • the signal strength of a cell may also be characterized by other characteristics of the cell signal, which is not limited in the present application.
  • the signal quality of a cell in the present application may be the RSRQ, or SINR, etc. of the cell.
  • the signal quality of a cell may also be jointly characterized by two or more items, namely, the RSRQ and SINR of the cell, which is not limited in the present application.
  • the target signal strength of the second cell can reflect not only the signal strength of the second cell, but also the signal quality of the second cell. That is, the target signal strength of the second cell reflects the comprehensive level of the signal strength and signal quality of the second cell. In other words, if the target signal strength of one second cell is higher than the target signal strength of another second cell, it means that the signal strength and signal quality of this second cell are better than the other second cell as a whole.
  • the target signal strength of the second cell can reflect the comprehensive level of the signal strength and signal quality of the second cell
  • the first cell instructs the electronic device to switch to the second cell through the switching command, which is a second cell with better signal strength and signal quality overall. Therefore, the electronic device has a higher success rate in accessing the second cell, which improves the success rate of the network fallback process.
  • the target signal strength of a cell is relative to the actual signal strength measured by the cell.
  • the target signal strength can be the result obtained after some processing based on the actual signal strength, and the target signal strength can be greater than or less than the actual signal strength.
  • the electronic device may receive an invite message sent by the first cell; or send an invite message to the first cell.
  • the electronic device does not support calls through the first network.
  • the network fallback process will be triggered, that is, the process of falling back from the first network to the second network will be triggered, so that the electronic device can make subsequent calls through the second network.
  • the network fallback process may be an EPSFB process.
  • the network fallback process may be a CSFB process.
  • the electronic device processes the signal strength of one or more second cells based on the signal quality of the one or more second cells measured within a first preset time period to obtain the target signal strength of the one or more second cells.
  • the operation may be: determining the weight corresponding to each second cell based on the signal quality of each second cell in the one or more second cells; and multiplying the signal strength of each second cell by the corresponding weight to obtain the target signal strength of each second cell.
  • the signal strength of each second cell is weighted according to the signal quality of each second cell in the one or more second cells to obtain the target signal strength of each second cell.
  • the target signal strength of each second cell can reflect the signal quality to a certain extent while mainly reflecting the signal strength.
  • the operation of the electronic device sending the measurement report message to the first cell may be: for any second cell among the one or more second cells, if the target signal strength of the second cell is higher than the signal strength threshold and the signal quality is not lower than the signal quality threshold, sending the target signal strength of the second cell to the first cell.
  • the measurement report message including the target signal strength of the second cell is not sent to the first cell.
  • the operation of the electronic device sending a measurement report message to the first cell may be: if there are no multiple specific cells among the one or more second cells whose target signal strength is higher than the signal strength threshold and whose target signal strength difference is less than a preset difference value, then the measurement report message is sent to the first cell.
  • the electronic device when the electronic device is in a preset mobile state, if it is found that there are multiple specific cells with high target signal strength and the same or similar target signal strength, it will delay until the target signal strength of the multiple specific cells changes, and then report the target signal strength of the specific cell with increased target signal strength to the first cell. Since the target signal strength of the second cell located in front of the moving direction of the electronic device increases with the movement of the electronic device compared to the second cell located behind the moving direction of the electronic device, the specific cell reported by the electronic device to the first cell is most likely the second cell located in front of the moving direction of the electronic device.
  • the second cell indicated by the first cell through the switching command is most likely a second cell located in front of the moving direction of the electronic device, then as the electronic device moves, the target signal strength of the second cell will become stronger and stronger, so the electronic device has a higher success rate in accessing the second cell, thereby improving the success rate of the network fallback process.
  • the signal strength and signal quality of the multiple specific cells are remeasured after the second preset time period, and the signal strength of the multiple specific cells is processed according to the signal quality of the multiple specific cells to obtain the target signal strength of the multiple specific cells.
  • a measurement report message including the target signal strength of this specific cell is sent to the first cell; if the target signal strength of this specific cell remains unchanged or decreases, and/or, if the signal quality of this specific cell is lower than the signal quality threshold, a measurement report message including the target signal strength of this specific cell is not sent to the first cell.
  • the electronic device fails to access a second cell indicated by the switching command, the RLF process is triggered. Afterwards, an RRC connection reestablishment request message can be sent to the target cell, where the target cell is the second cell.
  • the RRC connection reestablishment message sent by the target cell is received, SRB1 is configured according to the SRB1 configuration information carried by the RRC connection reestablishment message, and an RRC connection reestablishment completion message is sent to the target cell. If the electronic device does not receive an RRC reconfiguration message for configuring SRB2 sent by the target cell after the third preset time length of sending the RRC connection reestablishment completion message, TAU is performed through SRB1.
  • the TAU can be performed directly through SRB1. This can ensure the normal progress of the TAU, and then improve the success rate of related network fallback processes, etc.
  • the RLF process is triggered. Afterwards, an RRC connection reconstruction request message can be sent to the first target cell, and the first target cell is the second cell. Receive the RRC connection reconstruction message sent by the first target cell; send an RRC connection reconstruction completion message to the first target cell. If the electronic device does not receive the RRC reconfiguration message for configuring SRB2 sent by the first target cell after the fourth preset time length of sending the RRC connection reconstruction completion message, the RLF process is triggered, and the RRC connection reconstruction process is performed with the second target cell, and the second target cell is the second cell.
  • the electronic device after the electronic device sends the RRC connection reestablishment completion message to the first target cell, if the electronic device still does not receive the RRC reconfiguration message for configuring SRB2 sent by the first target cell after the fourth preset time, the electronic device will no longer continue to wait for the first target cell to send the RRC reconfiguration message, but directly trigger the RLF process to change the cell as soon as possible to perform the RRC connection reestablishment process. In this way, the long and meaningless waiting of the electronic device in the RRC connection reestablishment process can be avoided, and then the success rate of the related network fallback process can be improved.
  • a cell access method In a second aspect, a cell access method is provided.
  • an electronic device receives a measurement configuration message sent by a first cell, and the measurement configuration message is used to indicate the measurement of the signal strength of a neighboring cell of an alien system.
  • the signal strength and signal quality of a second cell are measured, and the second cell is a neighboring cell of an alien system of the first cell. If the signal quality of the second cell is lower than the signal quality threshold, a measurement report message is not sent to the first cell.
  • the electronic device receives a redirection message sent by the first cell, it accesses a second cell.
  • the signal quality of a second cell is not lower than the signal quality threshold, it means that the signal quality of the second cell is good; if the signal quality of a second cell is lower than the signal quality threshold, it means that the signal quality of the second cell is poor.
  • the electronic device if the signal quality of the second cell measured by the electronic device is lower than the signal quality threshold, the electronic device does not send a measurement report message to the first cell to trigger the first cell to instruct the electronic device to perform a redirection process. Since the electronic device can select a suitable second cell to access when performing the redirection process, the access success rate is relatively high, which also improves the success rate of the network fallback process.
  • the operation of the electronic device accessing a second cell may be: the electronic device accesses the signal strength A second cell whose signal strength is higher than the signal strength threshold and whose signal quality is not lower than the signal quality threshold. Since the signal strength and signal quality of the second cell are relatively good, the success rate of the electronic device accessing the second cell is relatively high.
  • the electronic device accesses a second cell belonging to a preset cell type.
  • the preset cell type can be set in advance.
  • the preset cell type is a cell type with a higher access success rate. Therefore, the electronic device has a higher success rate when accessing the second cell belonging to the preset cell type.
  • the preset cell type may be a high-speed rail cell.
  • the preset cell type may also be other cell types, and this application does not limit this.
  • the high-speed rail cells are some cells set up along the high-speed rail line, which are mainly used to solve the problem of poor signal of the electronic devices of people riding the high-speed rail during the high-speed rail. Since the high-speed rail cell is generally dedicated, it will not be too congested. In addition, some operators will isolate the high-speed rail cell and the non-high-speed rail cell, so it is not easy to have problems when accessing the high-pass cell. As a result, during the high-speed rail journey, the electronic devices of people riding the high-speed rail have a relatively high success rate when accessing the high-speed rail cell, and the network experience after accessing the high-speed rail cell is also better.
  • the electronic device may also send a measurement report message to the first cell if the signal strength of the second cell is higher than the signal strength threshold and the signal quality is not lower than the signal quality threshold, and the measurement report message includes the signal strength of the second cell.
  • the electronic device fails to access a second cell after receiving a redirection message, the RLF process is triggered. Afterwards, an RRC connection reestablishment request message may be sent to the target cell, where the target cell is the second cell.
  • the RRC connection reestablishment message sent by the target cell is received, SRB1 is configured according to the SRB1 configuration information carried in the RRC connection reestablishment message, and an RRC connection reestablishment completion message is sent to the target cell. If the electronic device does not receive an RRC reconfiguration message for configuring SRB2 sent by the target cell after the third preset time length of sending the RRC connection reestablishment completion message, TAU is performed through SRB1.
  • the RLF process is triggered. Afterwards, an RRC connection reconstruction request message can be sent to the first target cell, and the first target cell is the second cell. Receive the RRC connection reconstruction message sent by the first target cell; send an RRC connection reconstruction completion message to the first target cell. If the electronic device does not receive the RRC reconfiguration message for configuring SRB2 sent by the first target cell after the fourth preset time length of sending the RRC connection reconstruction completion message, the RLF process is triggered, and the RRC connection reconstruction process is performed with the second target cell, and the second target cell is the second cell.
  • a cell access method In a third aspect, a cell access method is provided.
  • an electronic device receives a measurement configuration message sent by a first cell, and the measurement configuration message is used to indicate the measurement of the signal strength of a neighboring cell of an alien system.
  • the signal strength of a second cell is measured, and the second cell is a neighboring cell of an alien system of the first cell. If there are multiple specific cells in the measured second cell whose signal strength is higher than a signal strength threshold and whose difference in signal strength is less than a preset difference, and if the electronic device is in a preset mobile state, the signal strength of the multiple specific cells is remeasured after a second preset time length.
  • a measurement report message is sent to the first cell, and the measurement report message includes the signal strength of a specific cell with increased signal strength among the multiple specific cells.
  • the electronic device After re-measuring the signal strength of the multiple specific cells, a measurement report message is sent to the first cell, and the measurement report message includes the signal strength of a specific cell with increased signal strength among the multiple specific cells.
  • the electronic device After re-measuring the signal strength of the multiple specific cells, a measurement report message is sent to the first cell, and the measurement report message includes the signal strength of a specific cell with increased signal strength among the multiple specific cells.
  • the signal strength of the second cell measured by the electronic device will change quickly.
  • the signal strengths of the multiple specific cells are the same or similar, indicating that the electronic device is very likely moving to a relatively middle position of the multiple specific cells, but will soon move to another position.
  • the signal strengths of the multiple specific cells are currently the same or similar, they will soon change. It is understandable that the multiple The signal strength of the specific cell located in front of the moving direction of the electronic device among the specific cells will quickly become stronger, while the signal strength of the specific cell located behind the moving direction of the electronic device will quickly become weaker.
  • the second cell selected by the first cell may be the second cell located behind the moving direction of the electronic device.
  • the signal strength of the second cell will quickly weaken, so the electronic device is likely to fail to access the second cell when it subsequently attempts to access the second cell.
  • the embodiment of the present application does not report the signal strengths of the multiple specific cells to the first cell in this case, but remeasures the signal strengths of the multiple specific cells after the second preset time period. Since the second preset time period has passed, the signal strengths of the multiple specific cells that previously had the same or similar signal strengths have changed, wherein the signal strength of the specific cell located in front of the moving direction of the electronic device has become stronger, while the signal strength of the specific cell located behind the moving direction of the electronic device has become weaker.
  • the electronic device when the electronic device is in a preset mobile state, if it is found that there are multiple specific cells with high signal strength and the same or similar signal strength, it will delay until the signal strength of the multiple specific cells changes, and then report the signal strength of the specific cell with increased signal strength to the first cell. Since the signal strength of the second cell located in front of the moving direction of the electronic device increases with the movement of the electronic device compared to the second cell located behind the moving direction of the electronic device, the specific cell reported by the electronic device to the first cell is most likely the second cell located in front of the moving direction of the electronic device.
  • the second cell indicated by the first cell through the switching command is most likely a second cell located in front of the moving direction of the electronic device, then as the electronic device moves, the signal strength of the second cell will become stronger and stronger, so the electronic device has a higher success rate in accessing the second cell, thereby improving the success rate of the network fallback process.
  • the operation of the electronic device measuring the signal strength of the second cell may be: measuring the signal strength and signal quality of the second cell.
  • the operation of the electronic device sending a measurement report message to the first cell may be: for any specific cell among the multiple specific cells, if the signal strength of the specific cell increases and the signal quality of the specific cell is not lower than the signal quality threshold, then sending a measurement report message including the signal strength of the specific cell to the first cell.
  • the measurement report message including the signal strength of the specific cell is not sent to the first cell.
  • the electronic device receives an RRC reconfiguration message for configuring SRB2 sent by the target cell within the third preset time length of sending the RRC connection reestablishment completion message
  • SRB2 is configured according to the SRB2 configuration information in the RRC reconfiguration message; and TAU is performed through the SRB2.
  • TAU can be performed normally, and its related network fallback processes can also continue to proceed normally.
  • a cell access method in which if the electronic device triggers the RLF process, an RRC connection reestablishment request message is sent to the target cell. Afterwards, an RRC connection reestablishment message sent by the first target cell is received. An RRC connection reestablishment completion message is sent to the first target cell. If the electronic device does not receive an RRC reconfiguration message for configuring SRB2 sent by the first target cell after the fourth preset time length of sending the RRC connection reestablishment completion message, the RLF process is triggered, and the RRC connection reestablishment process is performed with the second target cell.
  • the electronic device after the electronic device sends the RRC connection reestablishment completion message to the first target cell, if the electronic device still does not receive the RRC reconfiguration message for configuring SRB2 sent by the first target cell after the fourth preset time, the electronic device will no longer continue to wait for the first target cell to send the RRC reconfiguration message, but directly trigger the RLF process to change the cell as soon as possible to perform the RRC connection reestablishment process. In this way, the long and meaningless waiting of the electronic device in the RRC connection reestablishment process can be avoided, and then the success rate of the related network fallback process can be improved.
  • TAU is performed. At this time, TAU can be performed normally, and its related network fallback process can also continue to proceed normally.
  • the electronic device may receive a handover command sent by the first cell, the handover command being used to instruct handover to a second cell. Afterwards, the electronic device accesses the second cell; if the access to the second cell fails, the RLF process is triggered.
  • the first target cell and the second target cell are the second cells.
  • a chip system is provided.
  • the chip system is applied to an electronic device.
  • the chip system includes one or more processors.
  • the processor is used to call computer instructions so that the electronic device executes the above-mentioned cell access method.
  • a cell access device having the function of implementing the above-mentioned cell access method behavior.
  • the cell access device includes at least one module, the at least one module being used to implement the above-mentioned cell access method behavior. Area access method.
  • an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the above-mentioned cell access method when executed by the processor.
  • a computer-readable storage medium wherein instructions are stored in the computer-readable storage medium, and when the computer-readable storage medium is executed on a computer, the computer executes the above-mentioned cell access method.
  • a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the above-mentioned cell access method.
  • FIG1 is a schematic diagram of a communication system provided in an embodiment of the present application.
  • FIG2 is a flow chart of a cell switching process provided by an embodiment of the present application.
  • FIG3 is a flow chart of a cell access method provided in an embodiment of the present application.
  • FIG4 is a schematic diagram of another communication system provided in an embodiment of the present application.
  • FIG5 is a schematic diagram of a cell access process provided in an embodiment of the present application.
  • FIG6 is a flow chart of another cell access method provided in an embodiment of the present application.
  • FIG7 is a schematic diagram of another cell access process provided in an embodiment of the present application.
  • FIG8 is a flow chart of another cell access method provided in an embodiment of the present application.
  • FIG9 is a flowchart of another cell access method provided in an embodiment of the present application.
  • FIG10 is a flowchart of another cell access method provided in an embodiment of the present application.
  • FIG12 is a flowchart of another cell access method provided in an embodiment of the present application.
  • FIG13 is a flowchart of another cell access method provided in an embodiment of the present application.
  • FIG16 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.
  • FIG. 17 is a software structure block diagram of an electronic device provided in an embodiment of the present application.
  • Fig. 1 is a schematic diagram of a communication system provided in an embodiment of the present application.
  • the communication system may include an electronic device 100, a first cell 200, and a second cell 300.
  • the number of the second cell 300 may be one or more.
  • the electronic device 100 is in the coverage of the first cell 200 and in the coverage of the second cell 300.
  • the electronic device 100 can access the first cell 200 or the second cell 300.
  • the electronic device 100 may also be referred to as a UE.
  • the electronic device 100 may support a variety of mobile communication technology standards, for example, the second generation mobile communication technology (2G) standard, the third generation mobile communication technology (3G) standard, the 4G standard, the 5G standard, etc.
  • the 4G standard may also be referred to as the long term evolution (LTE) standard.
  • the electronic device 100 may be a mobile terminal (MT), a mobile station (MS), a mobile unit (MU), a wireless unit, a remote unit, a user agent, a mobile client, etc.
  • the electronic device 100 may be a mobile phone, a tablet computer, a wearable device, a digital camera, a vehicle-mounted device, an augmented reality (AR) device, a virtual reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a personal digital assistant (PDA), a laptop computer, etc., and the embodiments of the present application are not limited thereto.
  • the second cell 300 is a neighboring cell of a different system of the first cell 200. That is, the mobile communication technology standards supported by the first cell 200 and the second cell 300 are different. Moreover, the mobile communication technology standard supported by the first cell 200 is higher than the mobile communication technology standard supported by the second cell 300.
  • the first cell 200 supports the 5G standard, in which case the first cell 200 can be called a 5G cell
  • the second cell 300 supports the 4G standard, in which case the second cell 300 can be called a 4G cell.
  • the first cell 200 supports the 4G standard, in which case the first cell 200 can be called a 4G cell
  • the second cell 300 supports the 3G standard, in which case the second cell 300 can be called a 3G cell.
  • the 5G cell can also be called a new radio (NR) cell.
  • the 4G cell can also be called an LTE cell.
  • the electronic device 100 can communicate with the cell.
  • the electronic device 100 communicates with the cell, that is, communicates with the base station of the cell.
  • the electronic device 100 communicates with the base station (node B, NB) of the 3G cell;
  • the electronic device 100 accesses a 4G cell, the electronic device 100 communicates with the evolutionary base station (evolutional node B, eNB) of the 4G cell;
  • the electronic device 100 accesses a 5G cell, the electronic device 100 communicates with the next generation base station (next generation node B, gNB) of the 5G cell.
  • the electronic device 100 can support a first mobile communication technology standard and a second mobile communication technology standard, and the first mobile communication technology standard is higher than the second mobile communication technology standard.
  • the first mobile communication technology standard is a mobile communication technology standard supported by the first cell 200
  • the second mobile communication technology standard is a mobile communication technology standard supported by the second cell 300.
  • the network based on the first mobile communication technology standard is The network based on the second mobile communication technology standard is called the first network
  • the network based on the second mobile communication technology standard is called the second network.
  • the first mobile communication technology standard may be the highest mobile communication technology standard among multiple mobile communication technology standards supported by the electronic device 100.
  • the electronic device 100 should normally stay in the first network as much as possible to ensure a high stay ratio of the first network.
  • the electronic device 100 does not support making calls through the first network. In this case, the electronic device 100 can fall back from the first network to the second network to make calls when a call is needed. When the electronic device 100 falls back from the first network to the second network, it switches from the first cell 200 to the second cell 300.
  • the electronic device 100 can support up to the 5G standard.
  • the 5G standard is the first mobile communication technology standard, and the 5G network is the first network
  • the 4G standard is the second mobile communication technology standard
  • the 4G network is the second network.
  • the electronic device 100 should normally reside in the 5G network as much as possible.
  • the electronic device 100 does not support calls through the 5G network, that is, the electronic device 100 does not support VONR calls.
  • the electronic device 100 can use EPSFB technology to fall back from the 5G network to the 4G network to use VOLTE calls when a call is needed, wherein the electronic device 100 will switch from the 5G cell to the 4G cell during the EPSFB process.
  • the electronic device 100 can support up to the 4G standard.
  • the 4G standard is the first mobile communication technology standard, and the 4G network is the first network
  • the 3G standard is the second mobile communication technology standard
  • the 3G network is the second network.
  • the electronic device 100 should stay in the 4G network as much as possible under normal circumstances.
  • the electronic device 100 does not support calls through the 4G network, that is, the electronic device 100 does not support VOLTE calls.
  • the electronic device 100 needs to make a call, it can use the circuit switched fallback (CSFB) technology to fall back from the 4G network to the 3G network to use 3G calls, wherein during the CSFB process, the electronic device 100 will switch from the 4G cell to the 3G cell.
  • CSFB circuit switched fallback
  • the cell switching process in the EPSFB process is exemplified by taking the first network as a 5G network, the first cell as a 5G cell, the second network as a 4G network, and the second cell as a 4G cell as an example. It can be understood that the cell switching process in the CSFB process when the first network is a 4G network, the first cell is a 4G cell, the second network is a 3G network, and the second cell is a 3G cell is similar to this, and the embodiments of the present application will not be repeated here.
  • FIG2 is a flow chart of a cell switching process provided by an embodiment of the present application.
  • the cell switching process may include the following steps 201 to 217 .
  • Step 201 The electronic device accesses the 5G cell.
  • RRC radio resource control
  • the electronic device does not support VONR calls.
  • Step 202 The 5G cell sends an invite message to the electronic device.
  • the 5G cell sends an invite message to the electronic device, which means that the electronic device is called by the calling device as the called device.
  • the electronic device may also send an invite message to the 5G cell.
  • the electronic device acts as a calling device to call the called device.
  • the EPSFB process will be triggered because the electronic device does not support VONR calls.
  • the EPSFB process may include the following steps 203 to 217.
  • the measurement configuration message is used to instruct the electronic device to measure the signal strength of a neighboring cell of a different system.
  • the measurement configuration message may include B1 event information.
  • the B1 event information may include a threshold value of the B1 event.
  • the B1 event is used to indicate that the signal strength of the heterogeneous system neighboring cell is higher than the threshold value.
  • the measurement configuration message is used to instruct the electronic device to report a measurement report (MR) message when the signal strength of the heterogeneous system neighboring cell is higher than the threshold value.
  • MR measurement report
  • Step 204 The electronic device measures the signal strength of the 4G cell.
  • the 4G cell is a neighboring cell of a different system than the 5G cell to which the electronic device is currently connected.
  • the signal strength of the 4G cell can be measured.
  • Step 205 The electronic device sends a measurement report message to the 5G cell.
  • the electronic device is in the coverage of 4G cell A and in the coverage of 4G cell B.
  • the electronic device measures the signal strength of 4G cell A, and when the signal strength of 4G cell A is higher than the threshold value, sends a measurement report message including the PCI and signal strength of 4G cell A to the 5G cell.
  • the electronic device measures the signal strength of 4G cell B, and when the signal strength of 4G cell B is higher than the threshold value, sends a measurement report message including the PCI and signal strength of 4G cell B to the 5G cell.
  • the handover command may be an RRC connection reconfiguration message carrying a mobility control (mobilityControlInfo) information element.
  • mobilityControlInfo mobility control
  • SRB is the channel for the actual transmission of signaling messages.
  • SRB1 is used to carry RRC messages and can also carry some non-access stratum (NAS) messages.
  • SRB2 is used to carry NAS messages.
  • DRB is the channel for the actual transmission of user data.
  • the handover command includes the wireless parameters required to be used when handing over to the 4G cell A, that is, the handover command is used to instruct handover to the 4G cell A. Then the electronic device can reside in the 4G cell A after receiving the handover command.
  • the electronic device may attempt to access 4G cell A according to the wireless parameters included in the switching command.
  • the electronic device may attempt to access 4G cell A using a random access method (including but not limited to a non-competitive random access method) according to the wireless parameters included in the switching command.
  • a random access method including but not limited to a non-competitive random access method
  • Step 208 The electronic device triggers the radio link failure (RLF) process and selects 4G cell B.
  • RLF radio link failure
  • the RLF process involves a cell selection process and an RRC connection reestablishment process, and the RRC connection reestablishment process is intended to reestablish the RRC connection.
  • the electronic device can first select a 4G cell, assuming that 4G cell B is selected here, and then the electronic device can reside in 4G cell B and then establish an RRC connection with 4G cell B, as described below.
  • Step 209 The electronic device sends an RRC connection reestablishment request (connection reestablishment request) message to 4G cell B.
  • the RRC connection reestablishment request message may carry a reestablishment reason.
  • the reestablishment reason triggered by RLF may be "otherFailure".
  • Step 210 4G cell B sends an RRC connection reestablishment message to the electronic device.
  • Step 211 The electronic device sends an RRC connection reestablishment complete message to 4G cell B.
  • the electronic device After the electronic device receives the RRC connection reestablishment message sent by 4G cell B, it can configure SRB1 according to the SRB1 configuration information in the RRC connection reestablishment message, and can send an RRC connection reestablishment completion message to 4G cell B through SRB1.
  • an electronic device can perform TAU through SRB1 when in RRC idle state.
  • an electronic device when in RRC connected state, an electronic device can only perform TAU through SRB2, and cannot perform TAU through SRB1. Therefore, after the electronic device sends an RRC connection reestablishment completion message to 4G cell B, it needs to wait for the RRC reconfiguration message sent by 4G cell B carrying SRB2 configuration information and DRB configuration information to configure SRB2 and DRB, and then perform TAU through SRB2.
  • Step 213 The electronic device triggers the TAU process.
  • Step 214 The electronic device sends an RRC connection request message to 4G cell B.
  • the TAU request message may include the tracking area identity (TAI) of the TA in which the electronic device is currently located.
  • TAU tracking area identity
  • Step 217 4G cell B sends a TAU reject message to the electronic device.
  • the electronic device After the electronic device receives the TAU rejection message sent by 4G cell B, it can determine that the EPSFB process has failed, resulting in a call failure. When the electronic device is a calling device, it is a calling failure, and when the electronic device is a called device, it is a called failure. Afterwards, the electronic device can initiate an attach process to try to continue to access 4G cell B.
  • Analysis of the root cause of the above call failure may be that after the electronic device sends the RRC connection reestablishment completion message to 4G cell B in step 211, the electronic device has not received the RRC reconfiguration message carrying SRB2 configuration information and DRB configuration information sent by 4G cell B in order to wait for the RRC reconfiguration message carrying SRB2 configuration information and DRB configuration information sent by 4G cell B, causing the electronic device to wait for too long (i.e., 5 seconds above).
  • the electronic device waits too long after sending the RRC connection reestablishment completion message to 4G cell B, which not only causes 4G cell B in step 211 to send an RRC connection release message to the electronic device, but also causes 4G cell B in step 217 to send a TAU rejection message to the electronic device.
  • the long waiting of the electronic device is also likely to cause the fallback timer of the electronic device to time out. That is, even if 4G cell B returns the TAU acceptance message to the electronic device after step 216, the EPSFB process fails due to the fallback timer of the electronic device, resulting in call failure.
  • the embodiment of the present application provides a cell access method to solve the above two problems, so as to avoid The EPSFB process fails, improving the call success rate.
  • the cell access method provided in the embodiment of the present application is used to solve the problem that the electronic device attempts to access 4G cell A but fails in step 207 of the embodiment of FIG2 above. This is described in detail in the embodiment of FIG3 below.
  • FIG3 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG3 , the method includes the following steps:
  • Step 301 An electronic device accesses a first cell.
  • the first cell has been explained in detail in the embodiment of FIG. 1 above, and will not be described in detail in this embodiment of the present application.
  • the electronic device accesses the first cell, the electronic device is in an RRC connected state. At this time, the electronic device resides in the first cell.
  • Step 302 the electronic device sends an invite message to the first cell, or the first cell sends an invite message to the electronic device.
  • the electronic device sends an invite message to the first cell or the first cell sends an invite message to the electronic device, since the electronic device does not support calls through the first network, it will trigger the network fallback process, that is, trigger the process of falling back from the first network to the second network, so that the electronic device can make subsequent calls through the second network.
  • the network fallback process may be an EPSFB process.
  • the network fallback process may be a CSFB process.
  • the network fallback process may at least include the following steps 303 to 308.
  • Step 303 The first cell sends a measurement configuration message to the electronic device.
  • the measurement configuration message may be an RRC connection reconfiguration message carrying a measConfig information element.
  • the measConfig information element may include a measurement frequency point.
  • the measurement configuration message is used to instruct the electronic device to measure the signal strength of a neighboring cell of a different system.
  • the measurement configuration message may include B1 event information.
  • the B1 event information may include a threshold value of the B1 event.
  • the B1 event is used to indicate that the signal strength of the heterogeneous system neighboring cell is higher than the threshold value.
  • the measurement configuration message is used to instruct the electronic device to report a measurement report message when the signal strength of the heterogeneous system neighboring cell is higher than the threshold value.
  • Step 304 After receiving the measurement configuration message, the electronic device measures the signal strength and signal quality of the second cell.
  • the second cell has been explained in detail in the embodiment of FIG. 1 above, and will not be described in detail in this embodiment of the present application.
  • the second cell is a neighboring cell of a different system of the first cell currently accessed by the electronic device.
  • the electronic device can continuously measure the signal strength and signal quality of the second cell.
  • the signal strength of a cell in an embodiment of the present application may be a reference signal receiving power (RSRP) of the cell.
  • RSRP reference signal receiving power
  • the signal strength of a cell may also be characterized by other characteristics of the cell signal, which is not limited in the embodiment of the present application.
  • the signal quality of the cell in the embodiment of the present application may be a reference signal reception quality (RSRQ) of the cell.
  • RSRQ reference signal reception quality
  • the signal quality of a cell may also be jointly characterized by two or more items, namely, the RSRQ and SINR of the cell, which is not limited in the embodiments of the present application.
  • the electronic device after receiving the measurement configuration message sent by the first cell, the electronic device can measure not only the signal strength of the second cell, but also the signal quality of the second cell. Furthermore, the electronic device can process the signal strength of the second cell according to the signal quality of the second cell and then report it to the first cell, as described below.
  • Step 305 After receiving the measurement configuration message, the electronic device processes the signal strength of the one or more second cells according to the signal quality of the one or more second cells measured within the first preset time period at intervals of the first preset time period to obtain the target signal strength of the one or more second cells.
  • the first preset duration can be set in advance.
  • the first preset duration can be set shorter, such as 300 milliseconds, 500 milliseconds, etc., which is not limited in the embodiment of the present application. It should be noted that the first cell will set a timeout after sending the measurement configuration message, and the first preset duration is less than the timeout.
  • the signal strength of the second cell measured by the electronic device is referred to as the actual signal strength of the second cell.
  • the target signal strength of each second cell in the one or more second cells is obtained by processing the actual signal strength of each second cell with reference to the signal quality of each second cell.
  • the target signal strength of the second cell can reflect not only the actual signal strength of the second cell, but also the signal quality of the second cell. That is, the target signal strength of the second cell reflects the comprehensive level of the actual signal strength and signal quality of the second cell. In other words, if the target signal strength of one second cell is higher than the target signal strength of another second cell, it means that the actual signal strength and signal quality of the second cell are better than the other second cell as a whole.
  • the target signal strength of the second cell A will be higher than the target signal strength of the second cell B.
  • the target signal strength of the second cell A will be lower than the target signal strength of the second cell B.
  • the target signal strength of the second cell A and the target signal strength of the second cell B should be determined based on the comprehensive level of the actual signal strength and signal quality of the second cell A and the comprehensive level of the actual signal strength and signal quality of the second cell B.
  • the target signal strength of the second cell A will be higher than the target signal strength of the second cell B.
  • the target signal strength of the second cell A will be lower than the target signal strength of the second cell B.
  • the operation of step 305 may be: the electronic device determines the weight corresponding to each second cell according to the signal quality of each second cell in the one or more second cells; and multiplies the actual signal strength of each second cell in the one or more second cells by the corresponding weight to obtain the target signal strength of each second cell.
  • Step 306 The electronic device sends a measurement report message to the first cell.
  • the measurement report message includes the target signal strength of the second cell whose target signal strength among the one or more second cells is higher than the signal strength threshold.
  • the measurement report message may also include a cell identifier (including but not limited to PCI) of the second cell.
  • the signal strength threshold may be pre-set.
  • the signal strength threshold may be a threshold value of the B1 event included in the measurement configuration message.
  • the electronic device after the electronic device receives the measurement configuration message, it can not only obtain the target signal strength of one or more second cells measured within the first preset time period every first preset time period, but also send a measurement report message to the first cell if there is a second cell among the one or more second cells whose target signal strength is higher than the signal strength threshold.
  • the electronic device may send a measurement report message to the first cell, and the measurement report message may include the target signal strength of each of the at least two second cells, and may further include the cell identifier of each of the at least two second cells, etc.; or, the electronic device may send at least two measurement report messages to the first cell, and each of the at least two measurement report messages may include the target signal strength of one of the at least two second cells, and may further include the cell identifier of the second cell, etc.; or, the electronic device may send at least one measurement report message to the first cell, and each of the at least one measurement report message may include the target signal strength of at least one of the at least two second cells, and may further include the cell identifier of each of the at least one second cell, etc.
  • the first cell may select a second cell according to the target signal strength of the second cell included in the measurement report message sent by the electronic device, for example, a second cell with the highest target signal strength may be selected.
  • the first cell may then instruct the electronic device to switch to the second cell.
  • Step 307 The first cell sends a handover command to the electronic device.
  • the handover command may be an RRC connection reconfiguration message carrying a mobilityControlInfo information element.
  • the handover command may include radio parameters required to be used when handing over to the second cell, such as a cell identifier of the second cell to be handed over, RB configuration information, etc.
  • Step 308 After receiving the switching command, the electronic device accesses a second cell indicated by the switching command.
  • the electronic device may access the second cell according to the wireless parameters included in the switching command.
  • the electronic device may access the second cell in a random access manner (including but not limited to a non-contention random access manner) according to the wireless parameters included in the switching command.
  • a random access manner including but not limited to a non-contention random access manner
  • the electronic device Since the second cell has a relatively good actual signal strength and overall signal quality, the electronic device will most likely be able to successfully access the second cell when trying to access the second cell.
  • the electronic device can make a call through the second network.
  • the communication system in the embodiment of the present application may include an electronic device, an access network and a core network.
  • the electronic device communicates with the access network, and the access network communicates with the core network.
  • the access network is responsible for connecting the vast number of end users to the core network one level at a time using some kind of wired or wireless connection and communication technology to achieve connection with the network.
  • the access network is the edge of the entire network, the part closest to the user, and is usually called the "last mile".
  • the main functions of the core network are to provide user connections, user management, and service bearing, and to provide an interface to the external network as a bearer network.
  • the establishment of user connections includes functions such as mobility management (MM), call management (CM), switching/routing, and recording notification (combined with intelligent network services to complete the connection relationship with intelligent network peripheral devices).
  • the core network of the 5G network is 5G Core (abbreviated as 5GC).
  • 5GC can use general network function virtualization equipment to replace the dedicated communication equipment of the 4G network.
  • the core network of the 4G network is the evolved packet core (EPC).
  • EPC has traditional capabilities of mobile networks such as user contract data storage, mobility management and data exchange, and can provide users with ultra-high-speed Internet experience.
  • the first cell belongs to the access network of the first network, and the base station of the first cell is an access network device in the first network.
  • the first cell is a 5G cell.
  • the electronic device When the electronic device resides in the 5G cell, the electronic device communicates with the gNB of the 5G cell, and the gNB communicates with the 5GC.
  • the second cell belongs to the access network of the second network, and the base station of the second cell is an access network device in the second network.
  • the second cell is a 4G cell.
  • the electronic device When the electronic device resides in the 4G cell, the electronic device communicates with the eNB of the 4G cell, and the eNB communicates with the EPC.
  • the process of the electronic device accessing a second cell indicated by the switching command in step 308 involves interaction between the electronic device, an access network device of the second network (ie, a base station of the second cell), and a core network of the second network.
  • an access network device of the second network ie, a base station of the second cell
  • the switching command sent by the first cell to the electronic device in step 307 may also include a non-contention random access preamble assigned to the electronic device.
  • the switching command may also be called a MSG0 message.
  • the process of the electronic device accessing a 4G cell indicated by the switching command in step 308 involves interaction between the electronic device, the eNB of the 4G cell, and the EPC, as described in detail in the embodiment of Figure 5 below.
  • FIG5 is a schematic diagram of a cell access process provided by an embodiment of the present application.
  • the cell access process may include the following steps 501 to 508 .
  • Step 501 The electronic device sends a random access preamble to the eNB of the 4G cell.
  • the electronic device may send the random access prefix assigned in the handover command to the eNB of the 4G cell according to the cell identifier of the 4G cell included in the handover command.
  • the electronic device may carry the random access prefix in a MSG1 message and send it to the eNB.
  • Step 502 After receiving the random access prefix, the eNB sends a random access response message to the electronic device.
  • the random access response message may also be referred to as a MSG2 message.
  • the electronic device After the electronic device receives the random access response message sent by the eNB, it has actually accessed the 4G cell. However, since the cell where the electronic device resides has changed, the electronic device needs to perform TAU after accessing the 4G cell to notify the network side (i.e., the eNB and EPC) of the TA in which it is currently located. Therefore, after receiving the random access response message, the electronic device will also perform the following steps 503 to 508 to perform TAU.
  • the network side i.e., the eNB and EPC
  • Step 503 After receiving the random access response message, the electronic device sends an RRC connection reconfigurtion complete message to the eNB, and the RRC connection reconfiguration complete message includes a TAU request message.
  • the electronic device may first configure the relevant RBs according to the RB configuration information in the handover command, for example, SRB1, SRB2, and DRB may be configured. In this case, in step 503, the electronic device may send the RRC connection reconfiguration completion message to the eNB via SRB1.
  • the TAU request message may include the TAI of the TA in which the electronic device is currently located.
  • Step 504 After receiving the RRC connection reconfiguration completion message, the eNB sends an initial UE message (initial UE message) to the EPC, and the initial UE message includes a TAU request message.
  • initial UE message initial UE message
  • Step 505 After receiving the initial UE message, the EPC sends a downlink NAS transport message to the eNB, and the downlink NAS transport message includes a TAU acceptance message.
  • the EPC may perform authentication (authentication/security) on the electronic device to create some security-related parameters for the electronic device.
  • the EPC can update the TA or TA list of the electronic device, and after the update, it will send a downlink NAS transmission message containing a TAU acceptance message to the eNB.
  • Step 506 After receiving the downlink NAS transmission message, the eNB sends a downlink information transmission (DL The downlink information transfer) message includes a TAU acceptance message.
  • DL The downlink information transfer includes a TAU acceptance message.
  • Step 507 After receiving the downlink information transfer message, the electronic device sends an uplink information transfer (UL information transfer) message to the eNB.
  • the uplink information transfer message includes a TAU complete message of the NAS layer.
  • the electronic device may send the uplink information transmission message to the eNB via SRB2.
  • Step 508 After receiving the uplink information transmission message, the eNB sends an uplink NAS transmission (uplink NAS transport) message to the EPC.
  • the uplink NAS transmission message includes a TAU completion message.
  • the TAU process is completed.
  • the embodiment of the present application only uses the embodiment of FIG. 5 above as an example to exemplify the process of the electronic device accessing the second cell in step 308, and the embodiment of FIG. 5 above does not limit the embodiment of the present application.
  • the electronic device may also access the second cell in other ways different from the embodiment of FIG. 5 above, and the embodiment of the present application does not limit this.
  • the embodiment of Figure 3 above is only an example of the network fallback process triggered by the call scenario.
  • the network fallback process triggered by other scenarios can also be implemented by the cell access method provided in the embodiment of the present application. That is to say, in the embodiment of the present application, when the electronic device accesses the first cell in step 301, not only can the network fallback process described in subsequent steps 303 to 308 be triggered in the scenario described in step 302, but also the network fallback process described in subsequent steps 303 to 308 can be triggered in other scenarios where there is a network fallback demand.
  • the cell access method provided in the embodiment of the present application can improve the success rate of the network fallback process triggered in various scenarios.
  • the target signal strength of the second cell can reflect the comprehensive level of the actual signal strength and signal quality of the second cell
  • the first cell indicates that the second cell to which the electronic device is switched is a second cell with better actual signal strength and signal quality as a whole through the handover command, so that the electronic device has a higher success rate when accessing the second cell, thereby improving the success rate of the network fallback process.
  • step 602 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • the operation of the first cell sending a switching command to the electronic device is similar to the operation of step 307 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • the operation of the electronic device accessing a second cell indicated by the switching command is similar to the operation of step 308 in the embodiment of FIG. 3 above, and will not be described in detail in the embodiment of the present application.
  • the electronic device If the electronic device measures that the signal strength of a second cell is higher than the signal strength threshold, but the signal quality of the second cell is lower than the signal quality threshold, the electronic device does not report the signal strength of the second cell to the first cell, that is, the electronic device does not send a measurement report message including the signal strength of the second cell to the first cell.
  • the electronic device does not send a measurement report message including the signal strength of the second cell to the first cell.
  • the electronic device will not report the signal strength of any second cell to the first cell after receiving the measurement configuration message, that is, it will not send a measurement report message to the first cell.
  • the first cell sends the measurement configuration message to the electronic device, if the measurement report message sent by the electronic device is not received within a timeout, a redirection message will be sent to the first cell to trigger the electronic device to perform a redirection process.
  • Step 606 The first cell sends a redirection message to the electronic device.
  • the redirection message is used to instruct the electronic device to redirect to a neighboring cell of a different system.
  • the redirection message may be an RRC connection release message carrying a redirected frequency point (redirectedCarrierInfo) information element.
  • the redirected frequency point information element may include a redirected frequency point.
  • Step 607 After receiving the redirection message, the electronic device accesses a second cell.
  • the electronic device After receiving the redirection message, the electronic device will perform the redirection process. Specifically, the electronic device can release the RRC connection with the first cell, and after the RRC connection is released, the electronic device is in the RRC idle state, and then the electronic device can access a second cell.
  • the electronic device after the electronic device releases the RRC connection with the first cell, it can first search for the second cell corresponding to the redirected frequency. If there is no suitable second cell on the redirected frequency, the electronic device can expand the search range, that is, it can search for second cells corresponding to other frequencies to search for a possible better second cell and then access it.
  • the operation of the electronic device accessing a second cell may include the following two methods:
  • the first way the electronic device accesses a second cell whose signal strength is higher than a signal strength threshold and whose signal quality is not lower than a signal quality threshold.
  • the success rate of the electronic device accessing the second cell is relatively high.
  • the second method the electronic device accesses a second cell belonging to a preset cell type.
  • the preset cell type can be set in advance.
  • the preset cell type is a cell type with a higher access success rate. Therefore, the electronic device has a higher success rate when accessing the second cell belonging to the preset cell type.
  • the preset cell type may be a high-speed rail cell.
  • the preset cell type may also be other cell types, which is not limited in the embodiments of the present application.
  • the high-speed rail cells are some cells set up along the high-speed rail line, which are mainly used to solve the problem of poor signal of the electronic devices of the people riding the high-speed rail during the high-speed rail. Since the high-speed rail cell is generally dedicated, it will not be too congested. In addition, some operators will isolate the high-speed rail cell and the non-high-speed rail cell, so it is not easy to have problems when accessing the high-pass cell. As a result, during the high-speed rail journey, the electronic devices of the people riding the high-speed rail have a relatively high success rate in accessing the high-speed rail cell, and the network experience after accessing the high-speed rail cell is also better.
  • the system message broadcast by the second cell may carry the cell type of the second cell.
  • the electronic device may parse the system message of the second cell to obtain the cell type of the second cell.
  • the electronic device may access a second cell using a random access method (including but not limited to a contention-based random access method).
  • a random access method including but not limited to a contention-based random access method.
  • the electronic device after receiving the redirection message, the electronic device will release the RRC connection with the first cell. After the RRC connection is released, the electronic device is in the RRC idle state. After the electronic device is in the RRC idle state, after searching for a suitable second cell, it will reside in the second cell and try to access the second cell. Since the cell where the electronic device resides has changed, the TAU process will be triggered. In the TAU process, the electronic device will access the second cell and perform TAU.
  • the process of the electronic device accessing a 4G cell in step 607 involves interaction between the electronic device, the eNB of the 4G cell, and the EPC, as described in detail in the embodiment of FIG. 7 below.
  • FIG7 is a schematic diagram of a cell access process provided by an embodiment of the present application.
  • the cell access process may include the following steps 701 to 708 .
  • Step 701 The electronic device sends a random access prefix to the eNB of the 4G cell.
  • the electronic device may carry the random access prefix in a MSG1 message and send it to the eNB.
  • Step 702 After receiving the random access prefix, the eNB sends a random access response message to the electronic device.
  • the random access response message may also be referred to as a MSG2 message.
  • Step 703 After receiving the random access response message, the electronic device sends an RRC connection request message to the eNB.
  • the RRC connection request message may also be referred to as a MSG3 message.
  • Step 704 After receiving the RRC connection request message, the eNB sends an RRC connection establishment message to the electronic device.
  • the RRC connection establishment message may also be referred to as a MSG4 message.
  • the RRC connection establishment message may carry SRB1 configuration information.
  • the electronic device After the electronic device receives the RRC connection establishment message sent by the eNB, it has actually accessed the 4G cell. However, since the cell where the electronic device resides has changed, the electronic device needs to perform TAU after accessing the 4G cell to notify the network side (i.e., the eNB and EPC) of the TA it is currently in. Therefore, after receiving the RRC connection establishment message, the electronic device will also perform the following steps 705 to 710 to perform TAU.
  • the network side i.e., the eNB and EPC
  • Step 705 After receiving the RRC connection establishment message, the electronic device sends an RRC connection establishment completion message to the eNB, where the RRC connection establishment completion message includes a TAU request message.
  • the electronic device may configure SRB1 according to the SRB1 configuration information in the RRC connection establishment message, and then may send the RRC connection establishment completion message to the eNB through SRB1.
  • the TAU request message may include the TAI of the TA in which the electronic device is currently located.
  • Step 706 After receiving the RRC connection establishment completion message, the eNB sends an initial UE message to the EPC, where the initial UE message includes a TAU request message.
  • Step 707 After receiving the initial UE message, the EPC sends a downlink NAS transmission message to the eNB, where the downlink NAS transmission message includes a TAU acceptance message.
  • the EPC may Authenticate the electronic device to create some security-related parameters for the electronic device.
  • the EPC can update the TA or TA list of the electronic device, and after the update, it will send a downlink NAS transmission message containing a TAU acceptance message to the eNB.
  • Step 708 After receiving the downlink NAS transmission message, the eNB sends a downlink information transmission message to the electronic device, where the downlink information transmission message includes a TAU acceptance message.
  • Step 709 After receiving the downlink information transmission message, the electronic device sends an uplink information transmission message to the eNB, where the uplink information transmission message includes a TAU completion message.
  • Step 710 After receiving the uplink information transmission message, the eNB sends an uplink NAS transmission message to the EPC, where the uplink NAS transmission message includes a TAU completion message.
  • the cell access method provided in the embodiment of the present application is used to solve the problem that the electronic device attempts to access 4G cell A but fails to access in step 207 of the embodiment of FIG. 2 above. This is described in detail in the embodiment of FIG. 8 below.
  • the network fallback process will be triggered, that is, the process of falling back from the first network to the second network will be triggered, so that the electronic device can make subsequent calls through the second network.
  • the network fallback process may at least include the following steps 803 to 809.
  • step 803 is similar to the operation of step 303 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • step 804 is similar to the operation of the electronic device measuring the signal strength of the second cell in step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • the preset movement state may be set in advance.
  • the preset movement state may be a high-speed movement state.
  • the second cell selected by the first cell may be the second cell located behind the moving direction of the electronic device.
  • the signal strength of the second cell will quickly weaken, so the electronic device is likely to fail to access the second cell when it subsequently attempts to access the second cell.
  • Step 807 The electronic device remeasures the signal strengths of the multiple specific cells after a second preset time period.
  • the signal strength of the specific cell measured this time is higher than that of the previous measurement, the signal strength of the specific cell measured this time is reported to the first cell, that is, a measurement report message including the signal strength of the specific cell is sent to the first cell, as described in step 808 below.
  • the measurement report message includes the signal strength of the specific cell with increased signal strength among the multiple specific cells, and may further include a cell identifier (including but not limited to PCI) of the specific cell.
  • a cell identifier including but not limited to PCI
  • the electronic device can send a measurement report message to the first cell.
  • the measurement report message may include the signal strength of the specific cell and may further include the cell identifier of the specific cell.
  • the first cell may select a second cell according to the signal strength of the second cell included in the measurement report message sent by the electronic device, for example, a second cell with the highest signal strength may be selected. The first cell may then instruct the electronic device to switch to the second cell.
  • Step 809 The first cell sends a handover command to the electronic device.
  • step 809 is similar to the operation of step 307 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 810 After receiving the switching command, the electronic device accesses a second cell indicated by the switching command.
  • the signal strength of the second cell will become stronger and stronger as the electronic device moves, so the electronic device will most likely successfully access the second cell when trying to access it.
  • the electronic device can make a call through the second network.
  • a possible implementation manner for the electronic device to access the second cell may be the manner described in the embodiment of FIG. 5 above, which will not be described in detail in the embodiment of the present application.
  • the embodiment of Figure 8 above is only an example of an exemplary description of the network fallback process triggered by a call scenario.
  • the network fallback process triggered by other scenarios can also be implemented by the cell access method provided in the embodiment of the present application. That is to say, in the embodiment of the present application, when the electronic device accesses the first cell in step 801, not only can the network fallback process described in subsequent steps 803 to 810 be triggered in the scenario described in step 802, but also the network fallback process described in subsequent steps 803 to 810 can be triggered in other scenarios where there is a network fallback demand.
  • the cell access method provided in the embodiment of the present application can improve the success rate of the network fallback process triggered in various scenarios.
  • the electronic device after receiving the measurement configuration message sent by the first cell, the electronic device measures the second cell. signal strength. If there are multiple specific cells with high signal strength and the same or similar signal strength in the measured second cell, then when the electronic device is in a preset moving state, the signal strength of the multiple specific cells is remeasured after the second preset time period. After re-measuring the signal strength of the multiple specific cells, a measurement report message including the signal strength of the specific cell with increased signal strength is sent to the first cell. Afterwards, the electronic device can receive a switching command sent by the first cell.
  • the second cell indicated by the switching command is most likely a second cell located in front of the moving direction of the electronic device, then as the electronic device moves, the signal strength of the second cell will become stronger and stronger, so the electronic device has a higher success rate in accessing the second cell, thereby improving the success rate of the network fallback process.
  • the three possible methods provided in the embodiments of FIG. 3 to FIG. 8 above may be flexibly combined to better improve the success rate of the network fallback process.
  • step 901 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 902 the electronic device sends an invite message to the first cell, or the first cell sends an invite message to the electronic device.
  • step 902 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 903 The first cell sends a measurement configuration message to the electronic device.
  • step 903 is similar to the operation of step 303 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 904 After receiving the measurement configuration message, the electronic device measures the signal strength and signal quality of the second cell.
  • step 904 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 905 After receiving the measurement configuration message, the electronic device processes the signal strength of the one or more second cells according to the signal quality of the one or more second cells measured within the first preset time period at intervals of the first preset time period to obtain the target signal strength of the one or more second cells.
  • step 905 is similar to the operation of step 305 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 906 For any second cell among the one or more second cells, the electronic device determines whether the target signal strength of the second cell is higher than a signal strength threshold and whether the signal quality of the second cell is not lower than a signal quality threshold.
  • the target signal strength of the second cell is higher than the signal strength threshold and the signal quality of the second cell is not lower than the signal quality threshold, then execute the following steps 907 to 909. If the target signal strength of the second cell is not higher than the signal strength threshold and/or the signal quality of the second cell is lower than the signal quality threshold, then execute the following steps 910 to 912.
  • Step 907 If the target signal strength of the second cell is higher than the signal strength threshold and the signal strength of the second cell is If the quality is not lower than the signal quality threshold, the electronic device sends a measurement report message including the target signal strength of the second cell to the first cell.
  • a measurement report message may include only the target signal strength of one second cell, and may further include the cell identifier of the second cell, etc.; or, a measurement report message may include the target signal strength of at least two second cells, and may further include the cell identifier of each of the at least two second cells, etc.
  • the operation of the electronic device sending a measurement report message to the first cell in step 907 is similar to the operation of the electronic device sending a measurement report message to the first cell in step 306 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 908 The first cell sends a handover command to the electronic device.
  • step 908 is similar to the operation of step 307 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 909 After receiving the switching command, the electronic device accesses a second cell indicated by the switching command.
  • step 909 is similar to the operation of step 308 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 910 If the target signal strength of the second cell is not higher than the signal strength threshold and/or the signal quality of the second cell is lower than the signal quality threshold, the electronic device does not send a measurement report message including the target signal strength of the second cell to the first cell.
  • the electronic device will not report the target signal strength of any second cell to the first cell after receiving the measurement configuration message, that is, it will not send a measurement report message to the first cell.
  • the first cell sends the measurement configuration message to the electronic device, if the measurement report message sent by the electronic device is not received within a timeout, a redirection message will be sent to the first cell to trigger the electronic device to perform a redirection process.
  • the operation of the electronic device not sending a measurement report message to the first cell in step 910 is similar to the operation of the electronic device not sending a measurement report message to the first cell in step 605 in the embodiment of Figure 6 above, and this embodiment of the present application will not be repeated here.
  • Step 911 The first cell sends a redirection message to the electronic device.
  • step 911 is similar to the operation of step 606 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 912 After receiving the redirection message, the electronic device accesses a second cell.
  • step 912 is similar to the operation of step 607 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • the embodiment of FIG. 9 above is only an example of the network fallback process triggered by the call scenario.
  • the network fallback process triggered by other scenarios can also be implemented by the cell access method provided in the embodiment of the present application. That is to say, in the embodiment of the present application, when the electronic device accesses the first cell in step 901, not only can the network fallback process described in subsequent steps 903 to 912 be triggered in the scenario described in step 902, but also The network fallback process described in subsequent steps 903 to 912 may be triggered in other scenarios where there is a network fallback requirement.
  • the cell access method provided in the embodiment of the present application can improve the success rate of the network fallback process triggered in various scenarios.
  • Step 1001 An electronic device accesses a first cell.
  • step 1001 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1002 the electronic device sends an invite message to the first cell, or the first cell sends an invite message to the electronic device.
  • step 1002 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1003 The first cell sends a measurement configuration message to the electronic device.
  • step 1003 is similar to the operation of step 303 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1004 After receiving the measurement configuration message, the electronic device measures the signal strength and signal quality of the second cell.
  • step 1004 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1005 After receiving the measurement configuration message, the electronic device processes the signal strength of the one or more second cells according to the signal quality of the one or more second cells measured within the first preset time period at intervals of the first preset time period to obtain the target signal strength of the one or more second cells.
  • step 1005 is similar to the operation of step 305 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1006 The electronic device determines whether there are multiple specific cells in the one or more second cells; if there are multiple specific cells in the one or more second cells, execute step 1007 .
  • the multiple specific cells are some second cells with higher target signal strength and the same or similar target signal strength among the one or more second cells. That is, the target signal strength of each specific cell among the multiple specific cells is higher than the signal strength threshold, and the difference between the target signal strengths of any two specific cells among the multiple specific cells is less than a preset difference.
  • the electronic device can report the target signal strength of the second cell to the first cell if the target signal strength of the second cell is higher than the signal strength threshold, that is, send a measurement report message including the target signal strength of the second cell to the first cell.
  • the electronic device can report the target signal strength of the specific cell to the first cell, that is, send a measurement report message including the target signal strength of the specific cell to the first cell. If the electronic device is in the preset mobile state, the following step 1008 is executed.
  • Step 1008 The electronic device remeasures the signal strength and signal quality of the multiple specific cells after the second preset time period, and processes the signal strength of the multiple specific cells according to the measured signal quality of the multiple specific cells to obtain target signal strength of the multiple specific cells.
  • the target signal strength of the specific cell measured this time is higher than that of the previous measurement, the target signal strength of the specific cell is reported to the first cell, that is, a measurement report message including the target signal strength of the specific cell is sent to the first cell, as described in step 1009 below.
  • the measurement report message includes the target signal strength of the specific cell whose target signal strength increases among the multiple specific cells, and may further include a cell identifier (including but not limited to PCI) of the specific cell.
  • a cell identifier including but not limited to PCI
  • Step 1011 After receiving the switching command, the electronic device accesses a second cell indicated by the switching command.
  • step 1011 is similar to the operation of step 308 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • the embodiment of Figure 10 above is only an example of an exemplary description of the network fallback process triggered by a call scenario.
  • the network fallback process triggered by other scenarios can also be implemented by the cell access method provided in the embodiment of the present application. That is to say, in the embodiment of the present application, when the electronic device accesses the first cell in step 1001, not only can the network fallback process described in subsequent steps 1003 to 1011 be triggered in the scenario described in step 1002, but also the network fallback process described in subsequent steps 1003 to 1011 can be triggered in other scenarios where there is a network fallback demand.
  • the cell access method provided in the embodiment of the present application can improve the success rate of the network fallback process triggered in various scenarios.
  • FIG11 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG11 , the method includes the following steps:
  • Step 1101 An electronic device accesses a first cell.
  • step 1101 is similar to the operation of step 601 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 1102 the electronic device sends an invite message to the first cell, or the first cell sends an invite message to the electronic device.
  • step 1102 is similar to the operation of step 602 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 1103 The first cell sends a measurement configuration message to the electronic device.
  • step 1103 is similar to the operation of step 603 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 1104 After receiving the measurement configuration message, the electronic device measures the signal strength and signal quality of the second cell.
  • step 1104 is similar to the operation of step 604 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 1105 The electronic device determines whether there are multiple specific cells in the measured second cell; if the multiple specific cells exist in the measured second cell, execute step 1106.
  • the multiple specific cells are some second cells with higher signal strength and the same or similar signal strength among the second cells measured by the electronic device. That is, the signal strength of each specific cell among the multiple specific cells is higher than the signal strength threshold, and the difference in signal strength between any two specific cells among the multiple specific cells is less than a preset difference.
  • the electronic device can report the signal strength of the second cell to the first cell, that is, send a measurement report message including the signal strength of the second cell to the first cell, if the signal strength of the second cell is higher than the signal strength threshold and the signal quality is not lower than the signal quality threshold. If the signal strength of the second cell is not higher than the signal strength threshold, and/or the signal quality of the second cell is lower than the signal quality threshold, the signal strength of the second cell is not reported to the first cell, that is, the measurement report message including the signal strength of the second cell is not sent to the first cell.
  • the electronic device may report the signal strength of the second cell to the first cell when the signal strength of the second cell is higher than the signal strength threshold and the signal quality is not lower than the signal quality threshold, that is, send a measurement report message including the signal strength of the second cell to the first cell; if the signal strength of the second cell is not higher than the signal strength threshold and/or the signal quality of the second cell is lower than the signal quality threshold, the signal strength of the second cell is not reported to the first cell, that is, the measurement report message including the signal strength of the second cell is not sent to the first cell.
  • Step 1106 The electronic device determines whether the electronic device is in a preset moving state. If the electronic device is in the preset moving state, step 1107 is executed.
  • the electronic device may report the signal strength of this specific cell to the first cell if the signal quality of this specific cell is not lower than the signal quality threshold, that is, send a measurement report message including the signal strength of this specific cell to the first cell; if the signal quality of this specific cell is lower than the signal quality threshold, the electronic device will not report the signal strength of this specific cell to the first cell, that is, will not send a measurement report message including the signal strength of this specific cell to the first cell.
  • step 1107 is executed.
  • Step 1107 The electronic device remeasures the signal strength and signal quality of the multiple specific cells after a second preset time period.
  • Step 1108 For any specific cell among the multiple specific cells, the electronic device determines whether the signal strength of the specific cell increases and whether the signal quality of the specific cell is not lower than the signal quality threshold.
  • step 1109 to 1111 If the signal strength of the specific cell increases and the signal quality of the specific cell is not lower than the signal quality threshold, execute the following steps 1109 to 1111; if the signal strength of the specific cell remains unchanged or decreases, and/or the signal quality of the specific cell is lower than the signal quality threshold, execute steps 1112 to 1114.
  • the signal strength of this specific cell measured this time remains unchanged or decreases compared with the previous measurement, the signal strength of this specific cell will not be reported to the first cell, that is, the measurement report message including the signal strength of this specific cell will not be sent to the first cell, as described in the following step 1112.
  • the signal strength of this specific cell measured this time is higher than that of the previous measurement, then when the signal quality of this specific cell is not lower than the signal quality threshold, the signal strength of this specific cell is reported to the first cell, that is, a measurement report message including the signal strength of this specific cell is sent to the first cell, as described in the following step 1109; and when the signal quality of this specific cell is lower than the signal quality threshold, the signal strength of this specific cell is not reported to the first cell, that is, the measurement report message including the signal strength of this specific cell is not sent to the first cell, as described in the following step 1112.
  • Step 1109 If the signal strength of the specific cell increases and the signal quality of the specific cell is not lower than the signal quality threshold, the electronic device sends a measurement report message including the signal strength of the specific cell to the first cell.
  • the operation of the electronic device sending a measurement report message to the first cell in step 1109 is similar to the operation of the electronic device sending a measurement report message to the first cell in step 808 in the embodiment of Figure 8 above, and will not be repeated in this embodiment of the present application.
  • Step 1110 The first cell sends a switching command to the electronic device.
  • Step 1112 If the signal strength of the specific cell remains unchanged or decreases, and/or the signal quality of the specific cell is lower than the signal quality threshold, the electronic device does not send a measurement report message including the signal strength of the specific cell to the first cell.
  • the electronic device will not report the signal strength of any second cell to the first cell after receiving the measurement configuration message, that is, it will not send a measurement report message to the first cell.
  • the first cell sends the measurement configuration message to the electronic device, if the first cell does not receive the measurement report message sent by the electronic device within a timeout period, it will send a redirection message to the first cell to trigger the electronic device to perform a redirection process.
  • the operation of the electronic device not sending a measurement report message to the first cell in step 1112 is similar to the operation of the electronic device not sending a measurement report message to the first cell in step 605 in the embodiment of Figure 6 above, and will not be repeated in this embodiment of the present application.
  • Step 1113 The first cell sends a redirection message to the electronic device.
  • step 1113 is similar to the operation of step 606 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 1114 After receiving the redirection message, the electronic device accesses a second cell.
  • step 1114 is similar to the operation of step 607 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • the embodiment of Figure 11 above is only an example of an exemplary description of the network fallback process triggered by a call scenario.
  • the network fallback process triggered by other scenarios can also be implemented by the cell access method provided in the embodiment of the present application. That is to say, in the embodiment of the present application, when the electronic device accesses the first cell in step 1101, not only can the network fallback process described in subsequent steps 1103 to 1114 be triggered in the scenario described in step 1102, but also the network fallback process described in subsequent steps 1103 to 1114 can be triggered in other scenarios where there is a network fallback demand.
  • the cell access method provided in the embodiment of the present application can improve the success rate of the network fallback process triggered in various scenarios.
  • FIG. 3 a possible combination of the above-mentioned embodiments of FIG. 3 , FIG. 6 , and FIG. 8 will be explained in detail.
  • FIG12 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG12 , the method includes the following steps:
  • Step 1201 An electronic device accesses a first cell.
  • step 1201 is similar to the operation of step 301 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1202 the electronic device sends an invite message to the first cell, or the first cell sends an invite message to the electronic device.
  • step 1202 is similar to the operation of step 302 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1203 The first cell sends a measurement configuration message to the electronic device.
  • Step 1204 After receiving the measurement configuration message, the electronic device measures the signal strength and signal quality of the second cell.
  • step 1204 is similar to the operation of step 304 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1205 After receiving the measurement configuration message, the electronic device measures the signal strength of the one or more second cells at intervals of a first preset time length according to the signal quality of the one or more second cells measured within the first preset time length.
  • the target signal strengths of the one or more second cells are obtained by performing processing.
  • step 1205 is similar to the operation of step 305 in the embodiment of FIG. 3 above, and will not be described in detail in this embodiment of the present application.
  • Step 1206 The electronic device determines whether there are multiple specific cells in the one or more second cells; if there are multiple specific cells in the one or more second cells, execute step 1207 .
  • the multiple specific cells are some second cells with higher target signal strength and the same or similar target signal strength among the one or more second cells. That is, the target signal strength of each specific cell among the multiple specific cells is higher than the signal strength threshold, and the difference between the target signal strengths of any two specific cells among the multiple specific cells is less than a preset difference.
  • the electronic device may report the target signal strength of the second cell to the first cell if the target signal strength of the second cell is higher than the signal strength threshold and the signal quality of the second cell is not lower than the signal quality threshold, that is, send a measurement report message including the target signal strength of the second cell to the first cell; if the target signal strength of the second cell is not higher than the signal strength threshold, and/or the signal quality of the second cell is lower than the signal quality threshold, the target signal strength of the second cell shall not be reported to the first cell, that is, the measurement report message including the target signal strength of the second cell shall not be sent to the first cell.
  • the electronic device can report the target signal strength of the second cell to the first cell when the target signal strength of the second cell is higher than the signal strength threshold and the signal quality of the second cell is not lower than the signal quality threshold, that is, send a measurement report message including the target signal strength of the second cell to the first cell; if the target signal strength of the second cell is not higher than the signal strength threshold and/or the signal quality of the second cell is lower than the signal quality threshold, the target signal strength of the second cell is not reported to the first cell, that is, the measurement report message including the target signal strength of the second cell is not sent to the first cell.
  • Step 1207 The electronic device determines whether the electronic device is in a preset moving state. If the electronic device is in the preset moving state, step 1208 is executed.
  • the electronic device can report the target signal strength of the specific cell to the first cell if the signal quality of the specific cell is not lower than the signal quality threshold, that is, send a measurement report message including the target signal strength of the specific cell to the first cell; if the signal quality of the specific cell is lower than the signal quality threshold, the target signal strength of the specific cell is not reported to the first cell, that is, the measurement report message including the target signal strength of the specific cell is not sent to the first cell. If the electronic device is in a preset mobile state, the following step 1208 is executed.
  • Step 1208 The electronic device remeasures the signal strength and signal quality of the multiple specific cells after the second preset time period, and processes the signal strength of the multiple specific cells according to the measured signal quality of the multiple specific cells to obtain target signal strength of the multiple specific cells.
  • the operation of the electronic device processing the signal strengths of the multiple specific cells according to the measured signal qualities of the multiple specific cells in step 1208 to obtain the target signal strengths of the multiple specific cells is similar to the operation of the electronic device processing the signal strengths of the one or more second cells according to the signal qualities of the one or more second cells measured within the first preset time length in step 305 in the embodiment of FIG. 3 above to obtain the target signal strengths of the one or more second cells.
  • this embodiment of the present application will not be described in detail.
  • Step 1209 For any specific cell among the multiple specific cells, the electronic device determines whether the target signal strength of the specific cell increases and whether the signal quality of the specific cell is not lower than the signal quality threshold.
  • step 1210 to 1212 If the target signal strength of the specific cell increases and the signal quality of the specific cell is not lower than the signal quality threshold, execute the following steps 1210 to 1212; if the target signal strength of the specific cell remains unchanged or decreases, and/or the signal quality of the specific cell is lower than the signal quality threshold, execute steps 1213 to 1215.
  • the target signal strength of this specific cell measured this time remains unchanged or decreases compared with the previous measurement, the target signal strength of this specific cell will not be reported to the first cell, that is, the measurement report message including the target signal strength of this specific cell will not be sent to the first cell, as described in the following step 1213.
  • the target signal strength of this specific cell measured this time is higher than that of the previous measurement, then when the signal quality of this specific cell is not lower than the signal quality threshold, the target signal strength of this specific cell is reported to the first cell, that is, a measurement report message including the target signal strength of this specific cell is sent to the first cell, as described in the following step 1210; and when the signal quality of this specific cell is lower than the signal quality threshold, the target signal strength of this specific cell is not reported to the first cell, that is, the measurement report message including the target signal strength of this specific cell is not sent to the first cell, as described in the following step 1213.
  • Step 1210 If the target signal strength of the specific cell increases and the signal quality of the specific cell is not lower than the signal quality threshold, the electronic device sends a measurement report message including the target signal strength of the specific cell to the first cell.
  • the operation of the electronic device sending a measurement report message to the first cell in step 1210 is similar to the operation of the electronic device sending a measurement report message to the first cell in step 808 in the embodiment of Figure 8 above, and will not be repeated in this embodiment of the present application.
  • Step 1211 The first cell sends a switching command to the electronic device.
  • step 1211 is similar to the operation of step 809 in the embodiment of FIG. 8 above, and will not be described in detail in this embodiment of the present application.
  • Step 1212 After receiving the switching command, the electronic device accesses a second cell indicated by the switching command.
  • step 1212 is similar to the operation of step 810 in the embodiment of FIG. 8 above, and will not be described in detail in this embodiment of the present application.
  • Step 1213 If the target signal strength of the specific cell remains unchanged or decreases, and/or the signal quality of the specific cell is lower than the signal quality threshold, the electronic device does not send a measurement report message including the target signal strength of the specific cell to the first cell.
  • the electronic device will not report the target signal strength of any second cell to the first cell after receiving the measurement configuration message, that is, it will not send a measurement report message to the first cell.
  • the first cell sends the measurement configuration message to the electronic device, if the measurement report message sent by the electronic device is not received within a timeout, a redirection message will be sent to the first cell to trigger the electronic device to perform a redirection process.
  • the operation of the electronic device not sending a measurement report message to the first cell in step 1213 is similar to the operation of the electronic device not sending a measurement report message to the first cell in step 605 in the embodiment of Figure 6 above, and this embodiment of the present application will not be repeated here.
  • Step 1214 The first cell sends a redirection message to the electronic device.
  • step 1214 is similar to the operation of step 606 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • Step 1215 After receiving the redirection message, the electronic device accesses a second cell.
  • step 1215 is similar to the operation of step 607 in the embodiment of FIG. 6 above, and will not be described in detail in this embodiment of the present application.
  • the cell access method provided in the embodiment of the present application is used to solve the problem that the electronic device waits too long after sending the RRC connection reestablishment completion message to the 4G cell B in step 211 of the embodiment of FIG. 2 above. This is described in detail in the embodiments of FIG. 13 and FIG. 14 below.
  • the embodiment of FIG. 13 or the embodiment of FIG. 14 can be executed when the electronic device triggers the RLF process.
  • the electronic device can execute the embodiment of FIG. 13 or the embodiment of FIG. 14 below when the RLF process is triggered in step 208.
  • the electronic device can trigger the RLF process when it fails to access a second cell in step 308, and then the embodiment of FIG. 13 or the embodiment of FIG. 14 below can be executed.
  • the electronic device can trigger the RLF process when it fails to access a second cell in step 607, and then the embodiment of FIG. 13 or the embodiment of FIG. 14 below can be executed.
  • the electronic device can trigger the RLF process when it fails to access a second cell in step 809, and then the embodiment of FIG. 13 or the embodiment of FIG. 14 below can be executed.
  • the electronic device can trigger the RLF process when it fails to access a second cell in step 909 or step 912, and then the embodiment of FIG. 13 or the embodiment of FIG. 14 below can be executed.
  • the electronic device may trigger the RLF process when it fails to access a second cell in step 1011, and then the embodiment of Figure 13 or Figure 14 below may be executed.
  • the electronic device may trigger the RLF process when it fails to access a second cell in step 1111 or step 1114, and then the embodiment of Figure 13 or Figure 14 below may be executed.
  • the electronic device may trigger the RLF process when it fails to access a second cell in step 1212 or step 1215, and then the embodiment of Figure 13 or Figure 14 below may be executed.
  • the electronic device may also trigger the RLF process in other situations, and then execute the embodiment of Figure 13 or Figure 14 below.
  • FIG13 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG13 , the method includes the following steps:
  • the RLF process involves a cell selection process and an RRC connection reestablishment process, the purpose of which is to reestablish the RRC connection.
  • the electronic device can first select a cell (hereinafter referred to as the target cell). The electronic device may then reside in the target cell and establish an RRC connection with the target cell to access the target cell, as described in steps 1302 to 1306 below.
  • the electronic device may trigger an RLF process when accessing a second cell indicated by the handover command fails.
  • the target cell is the second cell.
  • Step 1302 The electronic device sends an RRC connection reestablishment request message to the target cell.
  • Step 1304 After receiving the RRC connection reestablishment message, the electronic device configures SRB1 according to the SRB1 configuration information.
  • the electronic device in order to prevent the electronic device from waiting too long after sending the RRC connection reestablishment completion message to the target cell, resulting in TAU failure, and then causing the failure of related network fallback processes, etc., the electronic device will set a timer after sending the RRC connection reestablishment completion message to the target cell.
  • the duration of the timer can be set in advance, and in the embodiment of the present application, the duration of the timer is referred to as the third preset duration.
  • Step 1306 If the electronic device does not receive an RRC reconfiguration message for configuring SRB2 sent by the target cell after sending an RRC connection reestablishment completion message to the target cell for a third preset time, a TAU is performed through SRB1.
  • the third preset duration can be set in advance.
  • the setting of the third preset duration can be based on the following principle: when the third preset duration times out, even if the RRC reconfiguration message for configuring SRB2 sent by the network side is not received, the electronic device will not receive the RRC connection release message sent by the network side.
  • the third preset duration can be less than the aforementioned 5 seconds (i.e., the 5 seconds that will result in receiving the RRC connection release message sent by the network side), and can be specifically 2 seconds. Seconds, or 3 seconds, etc., are not limited to this in the embodiments of the present application.
  • different user scenarios may correspond to different third preset durations.
  • the user scenario refers to the user's usage scenario, that is, what the user is doing with the electronic device.
  • the user scenario may reflect user needs.
  • the third preset duration corresponding to the user scenario with higher requirements for network latency may be relatively short.
  • the third preset duration corresponding to the user scenario with lower requirements for network latency may be relatively long.
  • the third preset duration may be relatively short, such as 2 seconds, 3 seconds, etc.
  • the third preset duration may be relatively long, such as 7 seconds, 8 seconds, etc.
  • the TAU can be performed directly through SRB1 when the current electronic device is in an RRC connection state (different from some existing technologies in which the TAU can only be performed through SRB2 when the current electronic device is in an RRC connection state). This can ensure the normal progress of the TAU, and then improve the success rate of related network fallback processes, etc.
  • the process of the electronic device performing TAU through SRB1 involves interaction between the electronic device, the eNB of the 4G cell, and the EPC, as described in detail in the embodiment of Figure 14 below.
  • Fig. 14 is a schematic diagram of a TAU process provided by an embodiment of the present application. Referring to Fig. 14, the TAU process may include the following steps 1401 to 1406.
  • Step 1401 The electronic device sends an uplink information transmission message to the eNB of the 4G cell via SRB1, where the uplink information transmission message includes a TAU request message.
  • Step 1402 After receiving the uplink information transmission message, the eNB sends an uplink NAS transmission message to the EPC, where the uplink NAS transmission message includes a TAU request message.
  • Step 1403 After receiving the uplink NAS transmission message, the EPC sends a downlink NAS transmission message to the eNB, where the downlink NAS transmission message includes a TAU acceptance message.
  • the EPC can update the TA or TA list of the electronic device, and after the update, it will send a downlink NAS transmission message containing a TAU acceptance message to the eNB.
  • Step 1404 After receiving the downlink NAS transmission message, the eNB sends a downlink information transmission message to the electronic device, where the downlink information transmission message includes a TAU acceptance message.
  • Step 1405 After receiving the downlink information transmission message, the electronic device sends an uplink information transmission message to the eNB through SRB1, where the uplink information transmission message includes a TAU completion message.
  • Step 1406 After receiving the uplink information transmission message, the eNB sends an uplink NAS transmission message to the EPC, where the uplink NAS transmission message includes a TAU completion message.
  • the TAU process is completed.
  • the electronic device can continue to perform other operations to complete the EPSFB process after completing the TAU process. After the electronic device completes the EPSFB process, it successfully falls back from the 5G network to the 4G network.
  • the present application embodiment only uses the embodiment of FIG. 14 above as an example to exemplify the process of the electronic device performing TAU through SRB1 in step 1306, and the embodiment of FIG. 14 above does not limit the present application embodiment.
  • the electronic device may also perform TAU through SRB1 in other ways different from the embodiment of FIG. 14 above.
  • the embodiments are not limited to this.
  • the electronic device can configure SRB2 according to the SRB2 configuration information in the RRC reconfiguration message, and then perform TAU through SRB2.
  • the process of the electronic device performing TAU through SRB2 is similar to the embodiment of Figure 14 above, the only difference being that in step 1401 and step 1405, the electronic device sends an uplink information transmission message to the eNB through SRB2.
  • the electronic device if the electronic device triggers the RLF process, it sends an RRC connection reestablishment request message to the target cell. Afterwards, if the electronic device receives the RRC connection reestablishment message sent by the target cell, it configures SRB1 according to the SRB1 configuration information in the RRC connection reestablishment message, and sends an RRC connection reestablishment completion message to the target cell. After the electronic device sends the RRC connection reestablishment completion message to the target cell, if it has not received the RRC reconfiguration message sent by the target cell for configuring SRB2 after a third preset time period, TAU is performed through SRB1. In this way, the normal progress of TAU can be ensured, and then the success rate of related network fallback processes, etc. can be improved.
  • FIG15 is a flow chart of a cell access method provided in an embodiment of the present application. Referring to FIG15 , the method includes the following steps:
  • Step 1501 The electronic device triggers the RLF process.
  • the RLF process involves a cell selection process and an RRC connection reestablishment process, and the RRC connection reestablishment process is intended to reestablish the RRC connection. Then, after the RLF process is triggered, the electronic device may first select a cell (hereinafter referred to as the first target cell), and then the electronic device may reside in the first target cell, and then establish an RRC connection with the first target cell to access the first target cell, as described in steps 1502 to 1506 below.
  • the first target cell hereinafter referred to as the first target cell
  • the electronic device may trigger an RLF process when accessing a second cell indicated by the handover command fails.
  • the first target cell is the second cell.
  • Step 1502 The electronic device sends an RRC connection reestablishment request message to the first target cell.
  • the RRC connection reestablishment request message may carry a reestablishment reason.
  • the reestablishment reason triggered by RLF may be "otherFailure".
  • Step 1503 After receiving the RRC connection reestablishment request message, the first target cell sends an RRC connection reestablishment message to the electronic device.
  • the RRC connection reestablishment message carries SRB1 configuration information.
  • Step 1504 After receiving the RRC connection reestablishment message, the electronic device sends an RRC connection reestablishment completion message to the first target cell.
  • the electronic device may configure SRB1 according to the SRB1 configuration information, and then send an RRC connection reestablishment completion message to the first target cell through SRB1.
  • the electronic device After the electronic device sends the RRC connection reestablishment completion message to the first target cell, the electronic device has reestablished the RRC connection with the first target cell, and the electronic device is now in an RRC connected state.
  • the electronic device has actually accessed the first target cell.
  • the electronic device needs to perform TAU after accessing the first target cell.
  • the electronic device needs to perform TAU through SRB2 when in the RRC connected state. Therefore, after the electronic device sends the RRC connection reestablishment completion message to the first target cell, it needs to wait for the RRC reconfiguration message sent by the first target cell to configure SRB2 and DRB, and then perform TAU through SRB2.
  • the electronic device after the electronic device sends the RRC connection reestablishment completion message to the first target cell, it can only wait The RRC reconfiguration message for configuring SRB2 to be sent by the first target cell.
  • the electronic device in order to prevent the electronic device from waiting too long after sending the RRC connection reestablishment completion message to the first target cell, causing the RRC connection reestablishment process to fail, and then causing the failure of related network fallback processes, etc., the electronic device sets a timer after sending the RRC connection reestablishment completion message to the first target cell.
  • the duration of the timer can be set in advance, and in the embodiment of the present application, the duration of the timer is referred to as a fourth preset duration.
  • the electronic device can configure SRB2 according to the SRB2 configuration information in the RRC reconfiguration message, and then perform TAU through SRB2. At this time, TAU can be performed normally, and its related network fallback processes can also continue to proceed normally.
  • the electronic device can trigger the RLF process to trigger the cell change reconstruction, as described below.
  • Step 1505 If the electronic device does not receive an RRC reconfiguration message for configuring SRB2 sent by the first target cell after sending an RRC connection reestablishment completion message to the first target cell for a fourth preset time period, the RLF process is triggered.
  • the fourth preset duration can be set in advance.
  • the setting of the fourth preset duration can be based on the following principle: when the fourth preset duration times out, even if the RRC reconfiguration message for configuring SRB2 sent by the network side is not received, the electronic device will not receive the RRC connection release message sent by the network side.
  • the fourth preset duration can be less than the aforementioned 5 seconds (i.e., 5 seconds that will result in the receipt of the RRC connection release message sent by the network side), and can specifically be 2 seconds, or 3 seconds, etc., which is not limited to this in the embodiments of the present application.
  • different user scenarios may correspond to different fourth preset durations.
  • the user scenario refers to the user's usage scenario, that is, what the user is doing with the electronic device.
  • the user scenario may reflect user needs.
  • the fourth preset duration corresponding to the user scenario with higher requirements for network latency may be relatively short.
  • the fourth preset duration corresponding to the user scenario with lower requirements for network latency may be relatively long.
  • the fourth preset duration may be relatively short, such as 1 second, 2 seconds, etc.
  • the fourth preset duration may be relatively long, such as 5 seconds, 6 seconds, etc.
  • the electronic device After the electronic device sends an RRC connection reestablishment completion message to the first target cell, if the fourth preset time period has not yet received the RRC reconfiguration message sent by the first target cell, then the RRC connection reestablishment process between the electronic device and the first target cell is likely to fail.
  • the electronic device can directly trigger the RLF process to trigger the cell change reconstruction. In this way, the cell can be changed as soon as possible to perform the RRC connection reestablishment process, avoiding the electronic device from waiting for a long time and meaninglessly, and then the success rate of related network fallback processes can be improved.
  • Step 1506 The electronic device performs an RRC connection reestablishment process with the second target cell.
  • the process of the electronic device performing the RRC connection reestablishment process with the second target cell is similar to the process of the electronic device performing the RRC connection reestablishment process with the first target cell, and the embodiment of the present application will not be repeated here.
  • FIG16 is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.
  • the electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc.
  • SIM subscriber identification module
  • the processor 110 may include one or more processing units, for example, the processor 110 may include an application processor (application processor, AP), a modem processor (Modem, also referred to as a baseband processor), a graphics processor (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), a controller, a memory, a video codec, a digital signal processor (digital signal processor, DSP), and/or a neural-network processing unit (neural-network processing unit, NPU), etc.
  • an application processor application processor, AP
  • Modem also referred to as a baseband processor
  • graphics processor graphics processor
  • image signal processor image signal processor
  • ISP image signal processor
  • controller a controller
  • memory a memory
  • video codec digital signal processor
  • DSP digital signal processor
  • NPU neural-network processing unit
  • different processing units may be independent devices or integrated in one or more processors.
  • Antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals.
  • Each antenna in the electronic device 100 can be used to cover a single or multiple communication frequency bands. Different antennas can also be reused to improve the utilization of the antennas.
  • antenna 1 can be reused as a diversity antenna for a wireless local area network.
  • the antenna can be used in combination with a tuning switch.
  • the SIM card interface 195 is used to connect a SIM card.
  • the SIM card can be connected to or disconnected from the electronic device 100 by inserting the SIM card interface 195 or removing the SIM card interface 195.
  • the electronic device 100 can support 1 or N SIM card interfaces, where N is an integer greater than 1.
  • the SIM card interface 195 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The types of the multiple cards can be the same or different. Different.
  • the SIM card interface 195 can also be compatible with different types of SIM cards.
  • the SIM card interface 195 can also be compatible with external memory cards.
  • the electronic device 100 interacts with the network through the SIM card to implement functions such as calls and data communications.
  • the electronic device 100 uses an eSIM, i.e., an embedded SIM card.
  • the eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.
  • the operating system of the electronic device 100 can adopt a layered architecture, an event-driven architecture, a micro-core architecture, a micro-service architecture, or a cloud architecture.
  • the embodiment of the present application takes the Android system of the layered architecture as an example to illustrate the hardware and software structure of the electronic device 100. It should be noted that although the embodiment of the present application is illustrated by taking the Android system as an example, its basic principle is also applicable to the electronic device 100 based on an operating system such as iOS or Windows.
  • FIG17 is a software structure block diagram of an electronic device 100 provided in an embodiment of the present application.
  • the software structure adopts a layered architecture, which divides the software into several layers, each layer having a clear role and division of labor.
  • the layers communicate with each other through software interfaces.
  • the Android system is divided into five layers, from top to bottom, namely, the application layer, the application framework layer (Framework), the Android runtime (Android runtime) and the system library, the hardware abstraction layer (HAL) and the kernel layer (Kernel).
  • the application layer may include a series of application packages.
  • the application packages may include camera, gallery, calendar, call, map, wireless local area network (WLAN), Bluetooth, music, video, short message, etc.
  • the application layer may also include system UI, which is used to display the interface of the electronic device 100, such as displaying the signal icon corresponding to the SIM card, displaying the call interface, etc.
  • the application framework layer provides an application programming interface (API) and a programming framework for the applications of the application layer.
  • the application framework layer includes some predefined functions.
  • the application framework layer may include a window manager, a content provider, a view system, a phone manager, a resource manager, a notification manager, etc.
  • the phone manager is used to provide call functions for the electronic device 100, such as management of call status (including connecting, hanging up, etc.).
  • the phone manager is represented by telephony in Figure 17.
  • the application framework layer may also include a wireless communication interface layer (radio interface layer, RIL).
  • RIL wireless communication interface layer
  • the modem can exchange information with the telephony through the RIL.
  • the modem may include a NAS layer, an RRC layer, a packet data convergence protocol (PDCP) layer, a radio link control protocol (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer.
  • the aforementioned layers may be software modules.
  • the modem may interact with the base station via an antenna.
  • the method provided in the embodiment of the present application may be implemented by a modem.
  • Some embodiments of the present application provide an electronic device, the electronic device comprising: one or more processors and a memory; the memory is used to store computer program code, the computer program code comprises computer instructions, and when the one or more processors execute the computer instructions, the electronic device executes the above-mentioned cell access method.
  • Some embodiments of the present application provide a chip system, which is applied to an electronic device.
  • the chip system includes at least one processor and an interface, wherein the interface is used to receive instructions and transmit them to the at least one processor; the at least one processor executes the instructions so that the electronic device executes the above-mentioned cell access method.
  • the chip system may be a modem, or a system on chip (Soc) including a modem, and the above-mentioned method may be implemented by a modem.
  • Soc system on chip
  • all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof.
  • all or part of the embodiments may be implemented in the form of a computer program product.
  • the computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof.
  • all or part of the embodiments may be implemented in the form of a computer program product.
  • the computer program product includes one or more computer instructions. Generate a process or function according to the embodiment of the present application.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network or other programmable device.
  • the computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium, for example, the computer instructions may be transmitted from a website, computer, server or data center by wired (e.g., coaxial cable, optical fiber, data subscriber line (Digital Subscriber Line, DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website, computer, server or data center.
  • the computer-readable storage medium may be any available medium that a computer can access, or a data storage device such as a server or data center that includes one or more available media integrated.
  • the available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a digital versatile disc (Digital Versatile Disc, DVD)) or a semiconductor medium (e.g., a solid-state drive (SSD)), etc.
  • a magnetic medium e.g., a floppy disk, a hard disk, a tape
  • an optical medium e.g., a digital versatile disc (Digital Versatile Disc, DVD)
  • a semiconductor medium e.g., a solid-state drive (SSD)

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Abstract

本申请公开了一种小区接入方法、电子设备和芯片系统，属于通信技术领域。该方法包括：电子设备接收第一小区发送的测量配置消息，测量第二小区的信号强度和信号质量，每隔第一预设时长根据在第一预设时长内测量到的第二小区的信号质量对第二小区的信号强度进行处理，得到第二小区的目标信号强度。向第一小区发送包括有目标信号强度高于信号强度阈值的第二小区的目标信号强度的测量报告消息。之后电子设备接收第一小区发送的切换命令。本申请中第一小区通过切换命令指示电子设备切换至的第二小区是信号强度和信号质量整体都比较好的一个第二小区，因而电子设备在接入这个第二小区时的成功率较高，如此也就提高了网络回落流程的成功率。

Description

小区接入方法、电子设备和芯片系统
本申请要求于2023年12月15日提交到国家知识产权局、申请号为202311739770.3、申请名称为“小区接入方法、电子设备和芯片系统”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，特别涉及一种小区接入方法、电子设备和芯片系统。
背景技术
在用户设备(user equipment，UE)支持第五代移动通信技术(5th generation mobile networks，5G)标准的情况下，UE通常会驻留在5G网络。这种情况下，若UE不支持新空口语音承载(voice over new radio，VONR)通话，则UE在通话时需采用演进分组系统回落(evolved packet system fallback，EPSFB)技术从5G网络回落到第四代移动通信技术(4th generation mobile networks，4G)网络来使用长期演进语音承载(voice over long term evolution，VOLTE)通话。
目前，在EPSFB流程开始后，UE当前接入的5G小区向UE发送测量配置消息。UE接收到该测量配置消息后，测量一个或多个4G小区的信号强度并上报给5G小区。之后，5G小区根据该一个或多个4G小区的信号强度从中选出一个4G小区，并向UE发送切换命令，以指示UE切换至这个4G小区。UE接收到该切换命令后，接入这个4G小区并进行跟踪区更新(tracking area update，TAU)，以实现EPSFB流程。
然而，实际情况中，因各种因素影响，容易出现EPSFB流程失败的问题。
发明内容
本申请实施例提供了一种小区接入方法、电子设备和芯片系统，可以提高网络回落流程的成功率。
第一方面，提供了一种小区接入方法。在该方法中，电子设备接收第一小区发送的测量配置消息，该测量配置消息用于指示测量异系统邻区信号强度。之后，电子设备测量第二小区的信号强度和信号质量。电子设备每隔第一预设时长，根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度。电子设备向第一小区发送测量报告消息，该测量报告消息包括该一个或多个第二小区中目标信号强度高于信号强度阈值的第二小区的目标信号强度。之后，电子设备若接收到第一小区发送的切换命令，则接入该切换命令所指示的一个第二小区。
第二小区为第一小区的异系统邻区。第一小区与第二小区支持的移动通信技术标准不同。并且，第一小区支持的移动通信技术标准(可称为第一移动通信技术标准)高于第二小区支持的移动通信技术标准(可称为第二移动通信技术标准)。比如，第一小区支持5G标准，第二小区支持4G标准。又比如，第一小区支持4G标准，第二小区300支持3G标准。在本申请中，将基于第一移动通信技术标准的网络称为第一网络，将基于 第二移动通信技术标准的网络称为第二网络。
可选地，本申请中小区的信号强度可以为小区的RSRP，当然，小区的信号强度也可以通过小区信号的其他特征来表征，本申请对此不作限定。
可选地，本申请中小区的信号质量可以为小区的RSRQ、或SINR等。当然，小区的信号质量也可以通过小区的RSRQ、SINR这两项或更多项联合表征，本申请对此不作限定。
第二小区的目标信号强度不仅可以反映第二小区的信号强度，还可以反映第二小区的信号质量。也即，第二小区的目标信号强度反映的是第二小区的信号强度和信号质量的综合水平。也就是说，若一个第二小区的目标信号强度高于另一个第二小区的目标信号强度，则说明这一个第二小区的信号强度和信号质量从整体来看优于另一个第二小区。
在本申请中，由于第二小区的目标信号强度可以反映第二小区的信号强度和信号质量的综合水平，所以第一小区在接收到电子设备发送的测量报告消息后，通过该切换命令指示电子设备切换至的第二小区是信号强度和信号质量整体都比较好的一个第二小区，因而电子设备在接入这个第二小区时的成功率较高，如此也就提高了网络回落流程的成功率。本申请中一个小区的目标信号强度是和该小区被测量到的实际信号强度相对而言的，目标信号强度可以是基于实际信号强度进行了一些处理后得到的结果，目标信号强度可以大于或小于实际信号强度。
作为一种示例，电子设备接收第一小区发送的测量配置消息之前，可以接收第一小区发送的invite消息；或者，向第一小区发送invite消息。
可选地，电子设备不支持通过第一网络进行通话。这种情况下，无论是电子设备向第一小区发送invite消息，还是第一小区向电子设备发送invite消息，由于电子设备不支持通过第一网络进行通话，所以均会触发网络回落流程，即触发从第一网络回落至第二网络的流程，以便电子设备可以通过第二网络进行后续通话。
比如，在第一网络为5G网络，第二网络为4G网络的情况下，该网络回落流程可以为EPSFB流程。又比如，在第一网络为4G网络，第二网络为3G网络的情况下，该网络回落流程可以为CSFB流程。
作为一种示例，电子设备根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度的操作可以为：根据该一个或多个第二小区中每个第二小区的信号质量，确定每个第二小区对应的权重；将每个第二小区的信号强度与对应的权重相乘，得到每个第二小区的目标信号强度。
在本申请中，根据该一个或多个第二小区中每个第二小区的信号质量来对每个第二小区的信号强度进行加权处理，以得到每个第二小区的目标信号强度。如此，可以使得每个第二小区的目标信号强度在主要反映信号强度的情况下也能在一定程度上反映信号质量。
作为一种示例，电子设备向第一小区发送测量报告消息的操作可以为：对于该一个或多个第二小区中任意的一个第二小区，若这个第二小区的目标信号强度高于信号强度阈值且信号质量不低于信号质量阈值，则向第一小区发送包括有这个第二小区的目标信 号强度的测量报告消息。另外，若这个第二小区的目标信号强度不高于信号强度阈值，和/或，若这个第二小区的信号质量低于信号质量阈值，则不向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息。
在本申请中，若电子设备接收到该测量配置消息后，测量到的所有第二小区的信号质量均低于信号质量阈值，那么在本申请中电子设备接收到该测量配置消息后将一直不会向第一小区上报任何第二小区的目标信号强度，即一直不会向第一小区发送测量报告消息。而第一小区在向电子设备发送该测量配置消息后，若超时未接收到电子设备发送的测量报告消息，则会向第一小区发送重定向消息，以触发电子设备进行重定向流程。由于电子设备执行重定向流程时可以自己选择一个合适的第二小区接入，所以接入成功率比较高，如此也就提高了网络回落流程的成功率。
作为一种示例，电子设备向第一小区发送测量报告消息的操作可以为：若该一个或多个第二小区中不存在目标信号强度高于信号强度阈值且目标信号强度之差小于预设差值的多个特定小区，则向第一小区发送该测量报告消息。
可选地，若该一个或多个第二小区中存在该多个特定小区，则在电子设备处于预设移动状态的情况下，在第二预设时长后重新测量该多个特定小区的信号强度和信号质量，并根据该多个特定小区的信号质量对该多个特定小区的信号强度进行处理，得到该多个特定小区的目标信号强度。对于该多个特定小区中任意的一个特定小区，若这个特定小区的目标信号强度增高，则向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息；若这个特定小区的目标信号强度不变或降低，则不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。
在本申请中，电子设备在处于预设移动状态时，在发现存在目标信号强度较高且目标信号强度相同或相近的多个特定小区的情况下，会延迟至该多个特定小区的目标信号强度发生变化后，向第一小区上报目标信号强度增高的特定小区的目标信号强度。由于相比于位于电子设备的移动方向的后方的第二小区，位于电子设备的移动方向的前方的第二小区的目标信号强度会随电子设备的移动而增高，所以电子设备向第一小区上报的特定小区大概率是位于电子设备的移动方向的前方的第二小区。这种情况下，第一小区通过切换命令所指示的一个第二小区大概率是位于电子设备的移动方向的前方的一个第二小区，那么随着电子设备的移动，这个第二小区的目标信号强度会越来越强，所以电子设备在接入这个第二小区时的成功率较高，如此也就提高了网络回落流程的成功率。
可选地，若该一个或多个第二小区中存在该多个特定小区，则在电子设备处于预设移动状态的情况下，在第二预设时长后重新测量该多个特定小区的信号强度和信号质量，并根据该多个特定小区的信号质量对该多个特定小区的信号强度进行处理，得到该多个特定小区的目标信号强度。对于该多个特定小区中任意的一个特定小区，若这个特定小区的目标信号强度增高且信号质量不低于信号质量阈值，则向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息；若这个特定小区的目标信号强度不变或降低，和/或，若这个特定小区的信号质量低于信号质量阈值，则不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。
在本申请中，若电子设备接收到该测量配置消息后，测量到的所有第二小区的信号质量均低于信号质量阈值，那么在本申请中电子设备接收到该测量配置消息后将一直不 会向第一小区上报任何第二小区的目标信号强度，即一直不会向第一小区发送测量报告消息。而第一小区在向电子设备发送该测量配置消息后，若超时未接收到电子设备发送的测量报告消息，则会向第一小区发送重定向消息，以触发电子设备进行重定向流程。由于电子设备执行重定向流程时可以自己选择一个合适的第二小区接入，所以接入成功率比较高，如此也就提高了网络回落流程的成功率。
在一种可能的方式中，若电子设备接入该切换命令所指示的一个第二小区失败，则触发RLF流程。之后，可以向目标小区发送RRC连接重建请求消息，目标小区为第二小区。接收目标小区发送的RRC连接重建消息，根据该RRC连接重建消息携带的SRB1配置信息配置SRB1，向目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第三预设时长后未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则通过SRB1进行TAU。
在本申请中，电子设备在向目标小区发送RRC连接重建完成消息后，若超过第三预设时长仍未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则可以直接通过SRB1进行TAU。如此可以保证TAU的正常进行，继而可以提高相关的网络回落流程等的成功率。
在另一种可能的方式中，若电子设备接入该切换命令所指示的一个第二小区失败，则触发RLF流程。之后，可以向第一目标小区发送RRC连接重建请求消息，第一目标小区为第二小区。接收第一目标小区发送的RRC连接重建消息；向第一目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第四预设时长后未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程，第二目标小区为第二小区。
在本申请中，电子设备在向第一目标小区发送RRC连接重建完成消息后，若超过第四预设时长仍未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则电子设备不再继续等待第一目标小区发送RRC重配置消息，而是直接触发RLF流程，以尽快更换小区进行RRC连接重建流程。如此，可以避免RRC连接重建流程中电子设备的长时间无意义等待，继而可以提高相关的网络回落流程等的成功率。
第二方面，提供了一种小区接入方法。在该方法中，电子设备接收第一小区发送的测量配置消息，该测量配置消息用于指示测量异系统邻区信号强度。之后，测量第二小区的信号强度和信号质量，第二小区为第一小区的异系统邻区。若第二小区的信号质量低于信号质量阈值，则不向第一小区发送测量报告消息。之后，电子设备若接收到第一小区发送的重定向消息，则接入一个第二小区。
若某个第二小区的信号质量不低于信号质量阈值，说明这个第二小区的信号质量较好；若某个第二小区的信号质量低于信号质量阈值，说明这个第二小区的信号质量较差。
在本申请中，若电子设备测量到的第二小区的信号质量低于信号质量阈值，则电子设备不向第一小区发送测量报告消息，以触发第一小区指示电子设备执行重定向流程。由于电子设备执行重定向流程时可以自己选择一个合适的第二小区接入，所以接入成功率比较高，如此也就提高了网络回落流程的成功率。
作为一种示例，电子设备接入一个第二小区的操作可以为：电子设备接入信号强度 高于信号强度阈值且信号质量不低于信号质量阈值的一个第二小区。由于这个第二小区的信号强度比较好且信号质量也比较好，所以电子设备接入这个第二小区时的成功率比较高。
或者，电子设备接入属于预设小区类型的一个第二小区。预设小区类型可以预先进行设置。预设小区类型是接入成功率较高的小区类型。因而电子设备在接入属于预设小区类型的第二小区时的成功率较高。
比如，预设小区类型可以为高铁小区，当然，预设小区类型也可以为其他小区类型，本申请对此不作限定。其中，高铁小区为在高铁沿线设立的一些小区，主要用以解决高铁行进过程中乘坐高铁的人员的电子设备的信号差的问题。由于高铁小区一般是专用的，所以不会过于拥塞，另外，有些运营商会把高铁小区和非高铁小区进行隔离，因而接入高通小区时不容易出现问题。由此，在高铁行进过程中，乘坐高铁的人员的电子设备在接入高铁小区时的成功率比较高，且在接入高铁小区后的网络体验也比较好。
作为一种示例，电子设备测量第二小区的信号强度和信号质量之后，还可以在第二小区的信号强度高于信号强度阈值且信号质量不低于信号质量阈值的情况下，向第一小区发送测量报告消息，该测量报告消息包括第二小区的信号强度。
在一种可能的方式中，若电子设备在接收到重定向消息后接入一个第二小区失败，则触发RLF流程。之后，可以向目标小区发送RRC连接重建请求消息，目标小区为第二小区。接收目标小区发送的RRC连接重建消息，根据该RRC连接重建消息携带的SRB1配置信息配置SRB1，向目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第三预设时长后未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则通过SRB1进行TAU。
在另一种可能的方式中，若电子设备在接收到重定向消息后接入一个第二小区失败，则触发RLF流程。之后，可以向第一目标小区发送RRC连接重建请求消息，第一目标小区为第二小区。接收第一目标小区发送的RRC连接重建消息；向第一目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第四预设时长后未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程，第二目标小区为第二小区。
第三方面，提供了一种小区接入方法。在该方法中，电子设备接收第一小区发送的测量配置消息，该测量配置消息用于指示测量异系统邻区信号强度。之后，测量第二小区的信号强度，第二小区为第一小区的异系统邻区。若测量的第二小区中存在信号强度高于信号强度阈值且信号强度之差小于预设差值的多个特定小区，且若电子设备处于预设移动状态，则在第二预设时长后重新测量该多个特定小区的信号强度。在重新测量该多个特定小区的信号强度后，向第一小区发生测量报告消息，该测量报告消息包括该多个特定小区中信号强度增高的特定小区的信号强度。之后，电子设备若接收到第一小区发送的切换命令，则接入该切换命令所指示的一个第二小区。
若电子设备处于预设移动状态，那么电子设备测量的第二小区的信号强度会变化的比较快。这种情况下，该多个特定小区的信号强度相同或相近，说明电子设备极有可能正移动到该多个特定小区的相对中间的位置，但很快将移动至其他位置。也就是说，该多个特定小区的信号强度当前虽然相同或相近，但很快将发生变化。可以理解的，该多 个特定小区中位于电子设备的移动方向的前方的特定小区的信号强度将很快变强，而位于电子设备的移动方向的后方的特定小区的信号强度将很快变弱。
在此情况下，若直接将该多个特定小区的信号强度上报给第一小区，则由于该多个特定小区的信号强度相同或相近，所以第一小区从中选出的一个第二小区有可能是位于电子设备的移动方向的后方的第二小区。而在电子设备处于预设移动状态的情况下，这个第二小区的信号强度会很快变弱，那么电子设备在后续尝试接入这个第二小区时很有可能会出现接入失败的问题。
由此，本申请实施例为了保证后续电子设备接入第二小区时的成功率，在此情况下先不向第一小区上报该多个特定小区的信号强度，而是在第二预设时长后重新测量该多个特定小区的信号强度。由于经过了第二预设时长，所以此前信号强度相同或相近的该多个特定小区的信号强度已经发生变化，其中位于电子设备的移动方向的前方的特定小区的信号强度变强，而位于电子设备的移动方向的后方的特定小区的信号强度变弱。
在本申请中，电子设备在处于预设移动状态时，在发现存在信号强度较高且信号强度相同或相近的多个特定小区的情况下，会延迟至该多个特定小区的信号强度发生变化后，向第一小区上报信号强度增高的特定小区的信号强度。由于相比于位于电子设备的移动方向的后方的第二小区，位于电子设备的移动方向的前方的第二小区的信号强度会随电子设备的移动而增高，所以电子设备向第一小区上报的特定小区大概率是位于电子设备的移动方向的前方的第二小区。这种情况下，第一小区通过切换命令所指示的一个第二小区大概率是位于电子设备的移动方向的前方的一个第二小区，那么随着电子设备的移动，这个第二小区的信号强度会越来越强，所以电子设备在接入这个第二小区时的成功率较高，如此也就提高了网络回落流程的成功率。
作为一种示例，电子设备测量第二小区的信号强度的操作可以为：测量第二小区的信号强度和信号质量。这种情况下，电子设备向第一小区发送测量报告消息的操作可以为：对于该多个特定小区中任意的一个特定小区，若这个特定小区的信号强度增高且这个特定小区的信号质量不低于信号质量阈值，则向第一小区发送包括有这个特定小区的信号强度的测量报告消息。另外，若这个特定小区的信号强度不变或降低，和/或，若这个特定小区的信号质量低于信号质量阈值，则不向第一小区发送包括有这个特定小区的信号强度的测量报告消息。
在一种可能的方式中，若电子设备接入该切换命令所指示的一个第二小区失败，则触发RLF流程。之后，可以向目标小区发送RRC连接重建请求消息，目标小区为第二小区。接收目标小区发送的RRC连接重建消息，根据该RRC连接重建消息携带的SRB1配置信息配置SRB1，向目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第三预设时长后未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则通过SRB1进行TAU。
在另一种可能的方式中，若电子设备接入该切换命令所指示的一个第二小区失败，则触发RLF流程。之后，可以向第一目标小区发送RRC连接重建请求消息，第一目标小区为第二小区。接收第一目标小区发送的RRC连接重建消息；向第一目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第四预设时长后未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二 目标小区进行RRC连接重建流程，第二目标小区为第二小区。
第四方面，提供了一种小区接入方法。在该方法中，若电子设备触发RLF流程，则向目标小区发送RRC连接重建请求消息。之后，接收目标小区发送的RRC连接重建消息，该RRC连接重建消息携带SRB1配置信息。电子设备根据该SRB1配置信息配置SRB1，向目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第三预设时长后未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则通过SRB1进行TAU。
在本申请中，电子设备在向目标小区发送RRC连接重建完成消息后，若超过第三预设时长仍未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则可以直接通过SRB1进行TAU。如此可以保证TAU的正常进行，继而可以提高相关的网络回落流程等的成功率。
作为一种示例，若电子设备在发送该RRC连接重建完成消息的第三预设时长内接收到目标小区发送的用于配置SRB2的RRC重配置消息，则根据该RRC重配置消息中的SRB2配置信息配置SRB2；通过该SRB2进行TAU。此时TAU可正常进行，其相关的网络回落流程等也可继续正常进行。
作为一种示例，电子设备可以接收第一小区发送的切换命令，该切换命令用于指示切换至一个第二小区。之后，电子设备接入这个第二小区；若接入这个第二小区失败，则触发RLF流程。这种情况下，目标小区为第二小区。
第五方面，提供了一种小区接入方法，在该方法中，若电子设备触发RLF流程，则向目标小区发送RRC连接重建请求消息。之后，接收第一目标小区发送的RRC连接重建消息。向第一目标小区发送RRC连接重建完成消息。若电子设备在发送该RRC连接重建完成消息的第四预设时长后未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程。
在本申请中，电子设备在向第一目标小区发送RRC连接重建完成消息后，若超过第四预设时长仍未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则电子设备不再继续等待第一目标小区发送RRC重配置消息，而是直接触发RLF流程，以尽快更换小区进行RRC连接重建流程。如此，可以避免RRC连接重建流程中电子设备的长时间无意义等待，继而可以提高相关的网络回落流程等的成功率。
作为一种示例，若电子设备在发送该RRC连接重建完成消息的第四预设时长后接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则进行TAU。此时TAU可正常进行，其相关的网络回落流程等也可继续正常进行。
作为一种示例，电子设备可以接收第一小区发送的切换命令，该切换命令用于指示切换至一个第二小区。之后，电子设备接入这个第二小区；若接入这个第二小区失败，则触发RLF流程。这种情况下，第一目标小区和第二目标小区为第二小区。
第六方面，提供了一种芯片系统，该芯片系统应用于电子设备，该芯片系统包括一个或多个处理器，该处理器用于调用计算机指令以使得电子设备执行上述的小区接入方法。
第七方面，提供了一种小区接入装置，该小区接入装置具有实现上述的小区接入方法行为的功能。该小区接入装置包括至少一个模块，该至少一个模块用于实现上述的小 区接入方法。
第八方面，提供了一种电子设备，电子设备包括存储器、处理器以及存储在该存储器中并可在该处理器上运行的计算机程序，该计算机程序被该处理器执行时实现上述的小区接入方法。
第九方面，提供了一种计算机可读存储介质，该计算机可读存储介质中存储有指令，当其在计算机上运行时，使得计算机执行上述的小区接入方法。
第十方面，提供了一种包含指令的计算机程序产品，当其在计算机上运行时，使得计算机执行上述的小区接入方法。
上述第六方面至第十方面所获得的技术效果与上述第一方面至第五方面中对应的技术手段获得的技术效果近似，在这里不再赘述。
附图说明
图1是本申请实施例提供的一种通信系统的示意图；
图2是本申请实施例提供的一种小区切换过程的流程图；
图3是本申请实施例提供的一种小区接入方法的流程图；
图4是本申请实施例提供的另一种通信系统的示意图；
图5是本申请实施例提供的一种小区接入过程的示意图；
图6是本申请实施例提供的另一种小区接入方法的流程图；
图7是本申请实施例提供的另一种小区接入过程的示意图；
图8是本申请实施例提供的另一种小区接入方法的流程图；
图9是本申请实施例提供的另一种小区接入方法的流程图；
图10是本申请实施例提供的另一种小区接入方法的流程图；
图11是本申请实施例提供的另一种小区接入方法的流程图；
图12是本申请实施例提供的另一种小区接入方法的流程图；
图13是本申请实施例提供的另一种小区接入方法的流程图；
图14是本申请实施例提供的一种TAU过程的示意图；
图15是本申请实施例提供的另一种小区接入方法的流程图；
图16是本申请实施例提供的一种电子设备的结构示意图；
图17是本申请实施例提供的一种电子设备的软件结构框图。
具体实施方式
为使本申请的目的、技术方案和优点更加清楚，下面将结合附图对本申请的实施方式作进一步地详细描述。
应当理解的是，本申请提及的“多个”是指两个或两个以上。在本申请的描述中，除非另有说明，“/”表示或的意思，比如，A/B可以表示A或B；本文中的“和/或”仅仅是一种描述关联对象的关联关系，表示可以存在三种关系，比如，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。另外，为了便于清楚描述本申请的技术方案，采用了“第一”、“第二”等字样对功能和作用基本相同的相同项或相似项进行区分。本领域技术人员可以理解“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。
在本申请中描述的“一个实施例”或“一些实施例”等语句意味着在本申请的一个或多个实施例中包括该实施例描述的特定特征、结构或特点。由此，在本申请中的不同之处出现的“在一个实施例中”、“在一些实施例中”、“在其他一些实施例中”、“在另外一些实施例中”等语句不是必然都参考相同的实施例，而是意味着“一个或多个但不是所有的实施例”，除非是以其他方式另外特别强调。此外，术语“包括”、“包含”、“具有”及它们的变形都意味着“包括但不限于”，除非是以其他方式另外特别强调。
下面对本申请实施例涉及的系统架构予以说明。
图1是本申请实施例提供的一种通信系统的示意图。参见图1，该通信系统可以包括电子设备100、第一小区200、第二小区300。第二小区300的数量可以为一个或多个。
电子设备100处于第一小区200的覆盖范围，且处于第二小区300的覆盖范围。电子设备100可以接入第一小区200或第二小区300。
电子设备100也可称为UE。电子设备100可以支持多种移动通信技术标准，比如，可以支持第二代移动通信技术(2th generation mobile networks，2G)标准、第三代移动通信技术(3th generation mobile networks，3G)标准、4G标准、5G标准等。其中，4G标准也可称为长期演进(long term evolution，LTE)标准。
示例地，电子设备100可以是移动终端(mobile terminal，MT)、移动台(mobile station，MS)、移动单元(mobile unit，MU)、无线单元、远程单元、用户代理、移动客户端等。比如，电子设备100可以是手机、平板电脑、可穿戴设备、数码相机、车载设备、增强现实(augmented reality，AR)设备、虚拟现实(virtual reality，VR)设备、笔记本电脑、超级移动个人计算机(ultra-mobile personal computer，UMPC)、上网本、个人数字助理(personal digital assistant，PDA)、膝上型计算机(laptop)等，本申请实施例对此不作限定。
第二小区300为第一小区200的异系统邻区。也即，第一小区200与第二小区300支持的移动通信技术标准不同。并且，第一小区200支持的移动通信技术标准高于第二小区300支持的移动通信技术标准。比如，第一小区200支持5G标准，这种情况下可将第一小区200称为5G小区；第二小区300支持4G标准，这种情况下可将第二小区300称为4G小区。又比如，第一小区200支持4G标准，这种情况下可将第一小区200称为4G小区；第二小区300支持3G标准，这种情况下可将第二小区300称为3G小区。可选地，5G小区也可称为新空口(new radio，NR)小区。4G小区也可称为LTE小区。
在电子设备100接入第一小区200、第二小区300中的一个小区的情况下，电子设备100可与这个小区进行通信。电子设备100与这个小区进行通信，即是与这个小区的基站进行通信。比如，在电子设备100接入3G小区的情况下，电子设备100与3G小区的基站(node B，NB)进行通信；在电子设备100接入4G小区的情况下，电子设备100与4G小区的演进型基站(evolutional node B，eNB)进行通信；在电子设备100接入5G小区的情况下，电子设备100与5G小区的下一代基站(next generation node B，gNB)进行通信。
需说明的是，本申请实施例中，电子设备100可以支持第一移动通信技术标准和第二移动通信技术标准，第一移动通信技术标准高于第二移动通信技术标准。第一移动通信技术标准为第一小区200支持的移动通信技术标准，第二移动通信技术标准为第二小区300支持的移动通信技术标准。其中，在本申请实施例中，将基于第一移动通信技术标准的网 络称为第一网络，将基于第二移动通信技术标准的网络称为第二网络。
第一移动通信技术标准可以是电子设备100所能支持的多种移动通信技术标准中最高的移动通信技术标准。在此情况下，电子设备100在正常情况下应尽可能的驻留在第一网络，以保证第一网络的高驻留比。
在一些实施例中，电子设备100不支持通过第一网络进行通话。这种情况下，电子设备100在需要通话时可以从第一网络回落到第二网络来进行通话。其中，电子设备100在从第一网络回落到第二网络时，会从第一小区200切换至第二小区300。
比如，电子设备100最高可支持5G标准。这种情况下，5G标准即为第一移动通信技术标准，5G网络即为第一网络；4G标准即为第二移动通信技术标准，4G网络即为第二网络。在此情况下，电子设备100在正常情况下应尽可能的驻留在5G网络。但是，电子设备100不支持通过5G网络进行通话，即电子设备100不支持VONR通话。那么电子设备100在需要通话时可以采用EPSFB技术从5G网络回落到4G网络来使用VOLTE通话，其中，在EPSFB过程中电子设备100会从5G小区切换至4G小区。
又比如，电子设备100最高可支持4G标准。这种情况下，4G标准即为第一移动通信技术标准，4G网络即为第一网络；3G标准即为第二移动通信技术标准，3G网络即为第二网络。在此情况下，电子设备100在正常情况下应尽可能的驻留在4G网络。但是，电子设备100不支持通过4G网络进行通话，即电子设备100不支持VOLTE通话。那么电子设备100在需要通话时可以采用电路域回落(circuit switched fallback，CSFB)技术从4G网络回落到3G网络来使用3G通话，其中，在CSFB过程中电子设备100会从4G小区切换至3G小区。
接下来以第一网络为5G网络、第一小区为5G小区、第二网络为4G网络、第二小区为4G小区为例，来对EPSFB过程中的小区切换过程进行示例性说明。可以理解的，第一网络为4G网络、第一小区为4G小区、第二网络为3G网络、第二小区为3G小区时的CSFB过程中的小区切换过程与此类似，本申请实施例对此不再赘述。
图2是本申请实施例提供的一种小区切换过程的流程图。参见图2，该小区切换过程可以包括如下步骤201至步骤217。
步骤201：电子设备接入5G小区。
电子设备接入5G小区的情况下电子设备处于无线资源控制(radio resource control，RRC)连接(connected)态。此时电子设备驻留于5G小区。
在一些实施例中，电子设备不支持VONR通话。
步骤202：5G小区向电子设备发送邀请(invite)消息。
5G小区向电子设备发送invite消息，即是电子设备作为被叫设备被主叫设备呼叫。
需说明的是，步骤202中也可以是电子设备向5G小区发送invite消息，这种情况下是电子设备作为主叫设备呼叫被叫设备。
无论是5G小区向电子设备发送invite消息，还是电子设备向5G小区发送invite消息，由于电子设备不支持VONR通话，所以均会触发EPSFB流程。EPSFB流程可以包括如下步骤203至步骤217。
步骤203：5G小区向电子设备发送测量配置消息。
示例地，该测量配置消息可以为携带有测量配置(measConfig)信元的RRC连接重配 置(connection reconfigurtion)消息。
该测量配置消息用于指示电子设备测量异系统邻区信号强度。
示例地，该测量配置消息可以包括B1事件信息。B1事件信息可以包括B1事件的门限值。B1事件用于指示异系统邻区信号强度高于该门限值。这种情况下，该测量配置消息用于指示电子设备在异系统邻区信号强度高于该门限值时上报测量报告(measurement report，MR)消息。
步骤204：电子设备测量4G小区的信号强度。
4G小区为电子设备当前接入的5G小区的异系统邻区。
电子设备若处于某个4G小区的覆盖范围内，则可以测量这个4G小区的信号强度。
步骤205：电子设备向5G小区发送测量报告消息。
电子设备在测量到某个4G小区的信号强度高于门限值时，可以向5G小区发送测量报告消息。
该测量报告消息包括信号强度高于门限值的4G小区的物理小区标识(physical cell identifier，PCI)和信号强度。
此处假设电子设备处于4G小区A的覆盖范围且处于4G小区B的覆盖范围。电子设备测量4G小区A的信号强度，且在4G小区A的信号强度高于门限值时向5G小区发送包括有4G小区A的PCI和信号强度的测量报告消息。并且，电子设备测量4G小区B的信号强度，且在4G小区B的信号强度高于门限值时向5G小区发送包括有4G小区B的PCI和信号强度的测量报告消息。
5G小区可以根据电子设备发送的测量报告消息包括的4G小区的信号强度从中选出一个4G小区，比如，可以选出信号强度最高的一个4G小区。然后5G小区可以指示电子设备切换至这个4G小区，具体如下所述。
步骤206：5G小区向电子设备发送切换命令。
示例地，该切换命令可以为携带有移动性控制(mobilityControlInfo)信元的RRC连接重配置消息。
可选地，该切换命令可以包括在切换至4G小区时需要使用的无线参数，如可以包括所要切换至的4G小区的PCI、无线承载(radio bearer，RB)配置信息等。
RB配置信息为与RB相关的配置信息。比如，RB配置信息可以包括与信令无线承载(sgnalling radio bearer，SRB)1、SRB2、数据无线承载(data radio bearer，DRB)相关的配置信息。
其中，SRB是信令消息实际传输的通道。SRB1用于承载RRC消息，还可以承载一些非接入层(non-access stratum，NAS)消息。SRB2用于承载NAS消息。其中，DRB是用户数据实际传输的通道。
此处假设该切换命令包括在切换至4G小区A时需要使用的无线参数，即该切换命令用于指示切换至4G小区A。那么电子设备接收到该切换命令后可驻留于4G小区A。
步骤207：电子设备尝试接入4G小区A，但接入失败。
可选地，电子设备可以根据该切换命令包括的无线参数来尝试接入4G小区A。
示例地，电子设备可以根据该切换命令包括的无线参数，采用随机接入方式(包括但不限于非竞争的随机接入方式)来尝试接入4G小区A。
需说明的是，虽然4G小区A的信号强度比较高，但是4G小区A的信号质量可能比较差。在4G小区A的信号质量比较差的情况下，电子设备在尝试接入4G小区A时很有可能会出现接入失败的情况。
步骤208：电子设备触发无线连接失败(radio link failure，RLF)流程，选择4G小区B。
RLF流程涉及小区选择流程和RRC连接重建流程，该RRC连接重建流程旨在重建RRC连接。那么电子设备在触发RLF流程后，可先选择一个4G小区，此处假设选择4G小区B，然后电子设备可驻留于4G小区B，再建立与4G小区B的RRC连接，具体如下所述。
步骤209：电子设备向4G小区B发送RRC连接重建请求(connection reestablishment request)消息。
可选地，RRC连接重建请求消息中可以携带重建原因。示例地，因RLF触发的重建原因可以为“otherFailure”。
步骤210：4G小区B向电子设备发送RRC连接重建(connection reestablishment)消息。
4G小区B接收到RRC连接重建请求消息后，可以向电子设备发送RRC连接重建消息。示例地，该RRC连接重建消息可以携带SRB1配置信息。SRB1配置信息为与SRB1相关的配置信息。
步骤211：电子设备向4G小区B发送RRC连接重建完成(connection reestablishment complete)消息。
电子设备接收到4G小区B发送的RRC连接重建消息后，可以根据该RRC连接重建消息中的SRB1配置信息配置SRB1，且可以通过SRB1向4G小区B发送RRC连接重建完成消息。
由于电子设备驻留的小区发生了变化，所以电子设备会发现自身所处的跟踪区(tracking area，TA)或者TA list发生变化，其中，1个TA list内包含多个TA。这种情况下，电子设备在与4G小区B建立RRC连接后，需要进行TAU，以通知网络侧(包括4G网络的接入网和核心网)自己当前所处的TA。
相关技术中，电子设备在RRC空闲态时可通过SRB1进行TAU。而电子设备在RRC连接态时只能通过SRB2进行TAU，不能通过SRB1进行TAU。因而电子设备在向4G小区B发送RRC连接重建完成消息后，需要等待4G小区B发送的携带了SRB2配置信息和DRB配置信息的RRC重配置消息来配置SRB2和DRB，继而才能通过SRB2进行TAU。
然而，在一些实际的场景中出现了如下的现象：在电子设备向4G小区B发送RRC连接重建完成消息后，4G小区B并未向电子设备发送携带了SRB2配置信息和DRB配置信息的RRC重配置消息，而是在一段时间(一般是大概5秒左右)后向电子设备发送了RRC连接释放(connection release)消息。经分析，出现此情况的原因可能是：4G小区B在接收到电子设备发送的RRC连接重建完成消息后，因长时间未发现电子设备使用RRC连接传输数据，所以向电子设备发送了RRC连接释放消息。
步骤212：4G小区B向电子设备发送RRC连接释放消息。
步骤213：电子设备触发TAU流程。
电子设备接收到该RRC连接释放消息后会释放与4G小区B的RRC连接，在RRC连接释放后电子设备处于RRC空闲态。电子设备处于RRC空闲态后会触发TAU流程。
电子设备触发TAU流程后，会先与4G小区B建立RRC连接，再通过SRB1进行TAU，具体如下所述。
步骤214：电子设备向4G小区B发送RRC连接请求(connection request)消息。
步骤215：4G小区B向电子设备发送RRC连接建立(connection setup)消息。
4G小区B接收到电子设备发送的RRC连接请求消息后，可以向电子设备发送RRC连接建立消息。示例地，该RRC连接建立消息可以携带SRB1配置信息。
步骤216：电子设备向4G小区B发送RRC连接建立完成(connection setup complete)消息，该RRC连接建立完成消息中包含NAS层的TAU请求(request)消息。
电子设备接收到4G小区B发送的RRC连接建立消息后，可以根据该RRC连接建立消息中的SRB1配置信息配置SRB1，然后可以通过SRB1向4G小区B发送该RRC连接建立完成消息。
示例地，TAU请求消息可以包括电子设备当前所处的TA的跟踪区标识(tracking area identity，TAI)。
电子设备向4G小区B发送该RRC连接建立完成消息后，4G小区B本应向电子设备返回NAS层的TAU接受(accept)消息。然而，在一些实际的场景中4G小区B并未向电子设备返回TAU接受消息，而是向电子设备返回了NAS层的TAU拒绝(reject)消息，且附带的拒绝原因值为#10隐式分离(implicitly detached)。经分析，出现此情况的原因可能是：因网络侧的回落(电子设备从5G网络回落到4G网络)定时器超时，导致网络侧已隐式分离电子设备，所以向电子设备返回了TAU拒绝消息。
步骤217：4G小区B向电子设备发送TAU拒绝消息。
电子设备接收到4G小区B发送的TAU拒绝消息后，可以确定EPSFB流程失败，从而导致呼叫失败。其中，电子设备为主叫设备时即是主叫失败，电子设备为被叫设备时即是被叫失败。之后，电子设备可以发起附着(attach)流程以尝试继续接入4G小区B。
分析上述呼叫失败的根本原因，可能在于在步骤211中电子设备向4G小区B发送RRC连接重建完成消息后，电子设备为了等待4G小区B发送的携带了SRB2配置信息和DRB配置信息的RRC重配置消息而一直未收到4G小区B发送的携带了SRB2配置信息和DRB配置信息的RRC重配置消息，导致电子设备等待了过长时间(即上文的5秒)。电子设备在向4G小区B发送RRC连接重建完成消息后等待过长时间，不仅会导致步骤211中的4G小区B向电子设备发送RRC连接释放消息，还会导致步骤217中的4G小区B向电子设备发送TAU拒绝消息。
并且，电子设备的长时间等待也很有可能会导致电子设备的回落定时器超时。也就是说，即使在步骤216后4G小区B向电子设备返回了TAU接受消息，但也会因电子设备的回落定时器超时而造成EPSFB流程失败，从而导致呼叫失败。
由上文图2实施例所述的小区切换过程可知，该过程主要存在两方面的问题：一方面是步骤207中电子设备尝试接入4G小区A，但接入失败。另一方面是步骤211中电子设备向4G小区B发送RRC连接重建完成消息后，电子设备等待了过长时间。
为此，本申请实施例提供了一种小区接入方法，用以解决上述两方面的问题，以避免 EPSFB流程失败，提高呼叫成功率。
下面对本申请实施例提供的小区接入方法进行详细地解释说明。
在一种可能的实现方式中，本申请实施例提供的小区接入方法用以解决上文图2实施例中的步骤207中电子设备尝试接入4G小区A，但接入失败的问题。接下来在下文图3实施例中对此进行详细说明。
图3是本申请实施例提供的一种小区接入方法的流程图。参见图3，该方法包括如下步骤：
步骤301：电子设备接入第一小区。
第一小区已在上文图1实施例中进行详细地解释说明，本申请实施例对此不再赘述。
电子设备接入第一小区的情况下电子设备处于RRC连接态。此时电子设备驻留于第一小区。
步骤302：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
电子设备向第一小区发送invite消息，即是电子设备作为主叫设备呼叫被叫设备。而第一小区向电子设备发送invite消息，即是电子设备作为被叫设备被主叫设备呼叫。
无论是电子设备向第一小区发送invite消息，还是第一小区向电子设备发送invite消息，由于电子设备不支持通过第一网络进行通话，所以均会触发网络回落流程，即触发从第一网络回落至第二网络的流程，以便电子设备可以通过第二网络进行后续通话。
比如，在第一网络为5G网络，第二网络为4G网络的情况下，该网络回落流程可以为EPSFB流程。又比如，在第一网络为4G网络，第二网络为3G网络的情况下，该网络回落流程可以为CSFB流程。
在本申请实施例中，该网络回落流程至少可以包括如下步骤303至步骤308。
步骤303：第一小区向电子设备发送测量配置消息。
示例地，该测量配置消息可以为携带有measConfig信元的RRC连接重配置消息。该measConfig信元可以包含测量频点。
该测量配置消息用于指示电子设备测量异系统邻区信号强度。
示例地，该测量配置消息可以包括B1事件信息。B1事件信息可以包括B1事件的门限值。B1事件用于指示异系统邻区信号强度高于该门限值。这种情况下，该测量配置消息用于指示电子设备在异系统邻区信号强度高于该门限值时上报测量报告消息。
步骤304：电子设备接收到该测量配置消息后，测量第二小区的信号强度和信号质量。
第二小区已在上文图1实施例中进行详细地解释说明，本申请实施例对此不再赘述。
电子设备若处于某个第二小区的覆盖范围内，这个第二小区即为电子设备当前接入的第一小区的异系统邻区。在一些实施例中，若这个第二小区为该测量配置消息中携带的测量频点对应的小区，则电子设备可以持续测量这个第二小区的信号强度和信号质量。
可选地，本申请实施例中小区的信号强度可以为小区的参考信号接收功率(reference signal receiving power，RSRP)，当然，小区的信号强度也可以通过小区信号的其他特征来表征，本申请实施例对此不作限定。
可选地，本申请实施例中小区的信号质量可以为小区的参考信号接收质量(reference  signal received quality，RSRQ)、或信号与干扰加噪声比(signal to interference plus noise ratio，SINR)等。当然，小区的信号质量也可以通过小区的RSRQ、SINR这两项或更多项联合表征，本申请实施例对此不作限定。
本申请实施例中，电子设备接收到第一小区发送的测量配置消息后，不仅可以测量第二小区的信号强度，还可以测量第二小区的信号质量。并且，电子设备可以根据第二小区的信号质量对第二小区的信号强度进行处理后再上报给第一小区，具体如下所述。
步骤305：电子设备接收到该测量配置消息后，每隔第一预设时长，根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度。
第一预设时长可以预先进行设置。第一预设时长可以设置的较短，如第一预设时长可以为300毫秒、500毫秒等，本申请实施例对此不作限定。需说明的是，第一小区发送该测量配置消息后会设置超时时间，第一预设时长小于该超时时间。
为了便于描述，以下将电子设备测量到的第二小区的信号强度称为第二小区的实际信号强度。对于电子设备在第一预设时长内测量的一个或多个第二小区，该一个或多个第二小区中每个第二小区的目标信号强度是以每个第二小区的信号质量为参考，对每个第二小区的实际信号强度处理得到的。
第二小区的目标信号强度不仅可以反映第二小区的实际信号强度，还可以反映第二小区的信号质量。也即，第二小区的目标信号强度反映的是第二小区的实际信号强度和信号质量的综合水平。也就是说，若一个第二小区的目标信号强度高于另一个第二小区的目标信号强度，则说明这一个第二小区的实际信号强度和信号质量从整体来看优于另一个第二小区。
比如，若第二小区A的实际信号强度与第二小区B的实际信号强度相同，但第二小区A的信号质量高于第二小区B的信号质量，那么第二小区A的目标信号强度会高于第二小区B的目标信号强度。
又比如，若第二小区A的实际信号强度低于第二小区B的实际信号强度，且第二小区A的信号质量也低于第二小区B的信号质量，那么第二小区A的目标信号强度会低于第二小区B的目标信号强度。
再比如，若第二小区A的实际信号强度低于第二小区B的实际信号强度，但第二小区A的信号质量高于第二小区B的信号质量，那么要视第二小区A的实际信号强度和信号质量的综合水平与第二小区B的实际信号强度和信号质量的综合水平的高低来定第二小区A的目标信号强度与第二小区B的目标信号强度的高低。
假设第二小区A的实际信号强度稍低于第二小区B的实际信号强度，第二小区A的信号质量远高于第二小区B的信号质量，那么第二小区A的目标信号强度会高于第二小区B的目标信号强度。或者，假设第二小区A的实际信号强度远低于第二小区B的实际信号强度，第二小区A的信号质量稍高于第二小区B的信号质量，那么第二小区A的目标信号强度会低于第二小区B的目标信号强度。
在一些实施例中，步骤305的操作可以为：电子设备根据该一个或多个第二小区中每个第二小区的信号质量，确定每个第二小区对应的权重；将该一个或多个第二小区中每个第二小区的实际信号强度与对应的权重相乘，得到每个第二小区的目标信号强度。
这种情况下，根据该一个或多个第二小区中每个第二小区的信号质量来对每个第二小区的实际信号强度进行加权处理，以得到每个第二小区的目标信号强度。如此，可以使得每个第二小区的目标信号强度在主要反映实际信号强度的情况下也能在一定程度上反映信号质量。
需说明的是，对于该一个或多个第二小区中任意的一个第二小区，这个第二小区的信号质量越大，那么这个第二小区对应的权重就越大；这个第二小区的信号质量越小，那么这个第二小区对应的权重就越小。
可选地，电子设备根据该一个或多个第二小区中每个第二小区的信号质量，确定每个第二小区对应的权重的操作可以为：对于该一个或多个第二小区中任意的一个第二小区，将这个第二小区的信号质量除以该一个或多个第二小区的信号质量中最大的信号质量，得到这个第二小区对应的权重。当然，电子设备也可以根据该一个或多个第二小区中每个第二小区的信号质量，通过其他方式确定每个第二小区对应的权重，本申请实施例对此不作限定。
步骤306：电子设备向第一小区发送测量报告消息。
该测量报告消息包括该一个或多个第二小区中目标信号强度高于信号强度阈值的第二小区的目标信号强度。示例地，该测量报告消息还可以包括第二小区的小区标识(包括但不限于PCI)。
该信号强度阈值可以预先进行设置。示例地，该信号强度阈值可以为该测量配置消息中包括的B1事件的门限值。
需说明的是，电子设备接收到该测量配置消息后，每隔第一预设时长，不仅可以获取在第一预设时长内测量的一个或多个第二小区的目标信号强度，还可以在该一个或多个第二小区中存在目标信号强度高于信号强度阈值的第二小区的情况下，向第一小区发送测量报告消息。
示例地，若该一个或多个第二小区中仅存在一个目标信号强度高于信号强度阈值的第二小区，则电子设备可以向第一小区发送一条测量报告消息，这条测量报告消息可以包括这个第二小区的目标信号强度，进一步还可以包括这个第二小区的小区标识等。
示例地，若该一个或多个第二小区中存在至少两个目标信号强度高于信号强度阈值的第二小区，则电子设备可以向第一小区发送一条测量报告消息，这条测量报告消息可以包括该至少两个第二小区中每个第二小区的目标信号强度，进一步还可以包括该至少两个第二小区中每个第二小区的小区标识等；或者，电子设备可以向第一小区发送至少两条测量报告消息，该至少两条测量报告消息中的每条测量报告消息可以包括该至少两个第二小区中的一个第二小区的目标信号强度，进一步还可以包括这个第二小区的小区标识等；或者，电子设备可以向第一小区发送至少一条测量报告消息，该至少一条测量报告消息中的每条测量报告消息可以包括该至少两个第二小区中的至少一个第二小区的目标信号强度，进一步还可以包括该至少一个第二小区中每个第二小区的小区标识等。
第一小区接收到电子设备发送的测量报告消息后，可以根据电子设备发送的测量报告消息包括的第二小区的目标信号强度选择一个第二小区，比如，可以选择目标信号强度最高的一个第二小区。然后第一小区可以指示电子设备切换至这个第二小区。
由于第二小区的目标信号强度可以反映第二小区的实际信号强度和信号质量的综合 水平，所以第一小区根据第二小区的目标信号强度选择的这个第二小区，是实际信号强度和信号质量整体都比较好的一个第二小区。
步骤307：第一小区向电子设备发送切换命令。
示例地，该切换命令可以为携带有mobilityControlInfo信元的RRC连接重配置消息。
可选地，该切换命令可以包括在切换至第二小区时需要使用的无线参数，如可以包括所要切换至的第二小区的小区标识、RB配置信息等。
步骤308：电子设备接收到该切换命令后，接入该切换命令所指示的一个第二小区。
可选地，电子设备可以根据该切换命令包括的无线参数来接入这个第二小区。
示例地，电子设备可以根据该切换命令包括的无线参数，采用随机接入方式(包括但不限于非竞争的随机接入方式)来接入这个第二小区。
由于这个第二小区是实际信号强度和信号质量整体都比较好的一个第二小区，所以电子设备在尝试接入这个第二小区时大概率会接入成功。
若电子设备成功接入这个第二小区，则可以继续执行其他操作来完成该网络回落流程。电子设备完成该网络回落流程后，即成功从第一网络回落至第二网络，那么电子设备可以通过第二网络进行通话。
接下来结合图4和图5对电子设备接入这个第二小区的一种可能的实现方式进行示例性说明。
作为一种示例，如图4所示，本申请实施例中的通信系统可以包括电子设备、接入网和核心网。电子设备与接入网进行通信，接入网与核心网进行通信。
接入网负责使用某种有线或无线的联接和通信技术将广大最终用户(end user)一级一级汇接到核心网中，实现与网络的连接。接入网是整个网络的边缘部分，与用户距离最近的一部分，通常也叫“最后一公里”。
示例地，5G网络的接入网包括5G小区，5G小区的基站(即gNB)可以称为5G网络中的接入网设备。示例地，4G网络的接入网包括4G小区，4G小区的基站(即eNB)可以称为4G网络中的接入网设备。
核心网主要功能是提供用户连接、对用户的管理以及对业务完成承载，作为承载网络提供到外部网络的接口。用户连接的建立包括移动性管理(mobile management，MM)、呼叫管理(call management，CM)、交换/路由、录音通知(结合智能网业务完成到智能网外围设备的连接关系)等功能。
示例地，5G网络的核心网为5G Core(可简称为5GC)。5GC可使用通用的网络功能虚拟化设备来代替4G网络的专用通信设备。示例地，4G网络的核心网为演进的分组核心(evolved packet core，EPC)。EPC具备用户签约数据存储、移动性管理和数据交换等移动网络的传统能力，并能够给用户提供超高速的上网体验。
本申请实施例中，第一小区属于第一网络的接入网，第一小区的基站为第一网络中的接入网设备。示例地，假设第一小区为5G小区。在电子设备驻留于5G小区时，电子设备与5G小区的gNB进行通信，gNB与5GC进行通信。
第二小区属于第二网络的接入网，第二小区的基站为第二网络中的接入网设备。示例地，假设第二小区为4G小区。在电子设备驻留于4G小区时，电子设备与4G小区的eNB进行通信，eNB与EPC进行通信。
在一些实施例中，步骤308中电子设备接入该切换命令所指示的一个第二小区的过程，涉及电子设备、第二网络的接入网设备(即第二小区的基站)、第二网络的核心网之间的交互。
假设在步骤308中电子设备采用非竞争的随机接入方式接入第二小区，那么在步骤307中第一小区向电子设备发送的切换命令中还可以包括为电子设备指派的非冲突的随机接入前缀(non-contention random access preamble)，在此情况下该切换命令也可以称为MSG0消息。
这种情况下，假设第二小区为4G小区，那么步骤308中电子设备接入该切换命令所指示的一个4G小区的过程涉及电子设备、该4G小区的eNB、EPC之间的交互，具体如下文图5实施例所述。
图5是本申请实施例提供的一种小区接入过程的示意图。参见图5，该小区接入过程可以包括如下步骤501至步骤508。
步骤501：电子设备向该4G小区的eNB发送随机接入前缀(random access preamble)。
示例地，电子设备可以根据该切换命令中包括的该4G小区的小区标识，向该4G小区的eNB发送该切换命令中指派的随机接入前缀。
示例地，电子设备可以将该随机接入前缀携带于MSG1消息中发送给该eNB。
步骤502：该eNB接收到该随机接入前缀后，向电子设备发送随机接入响应(random access response)消息。
示例地，该随机接入响应消息也可以称为MSG2消息。
需说明的是，电子设备接收到该eNB发送的随机接入响应消息后实际上就已经接入了该4G小区。但是由于电子设备驻留的小区发生了变化，所以电子设备接入该4G小区后还需要进行TAU，以通知网络侧(即该eNB和EPC)自己当前所处的TA。因而电子设备在接收到该随机接入响应消息后，还会执行如下步骤503至步骤508来进行TAU。
步骤503：电子设备接收到该随机接入响应消息后，向该eNB发送RRC连接重配置完成(connection reconfigurtion complete)消息，该RRC连接重配置完成消息中包含TAU请求消息。
在一些实施例中，电子设备接收到该切换命令后，可以先根据该切换命令中的RB配置信息配置相关的RB，比如，可以配置SRB1、SRB2、DRB。这种情况下，在步骤503中电子设备可以通过SRB1向该eNB发送该RRC连接重配置完成消息。
示例地，TAU请求消息可以包括电子设备当前所处的TA的TAI。
步骤504：该eNB接收到该RRC连接重配置完成消息后，向EPC发送初始UE消息(initial UE message)，该初始UE消息中包含TAU请求消息。
步骤505：EPC接收到该初始UE消息后，向该eNB发送下行NAS传输(downlink NAS transport)消息，该下行NAS传输消息中包含TAU接受消息。
可选地，EPC接收到该初始UE消息后，若确定电子设备是首次接入，那么EPC可以对电子设备进行鉴权(authentication/security)，以为电子设备创建一些与安全相关的参数。
可选地，EPC接收到该初始UE消息后，可以更新电子设备的TA或TA list，更新后会向该eNB发送包含有TAU接受消息的下行NAS传输消息。
步骤506：该eNB接收到该下行NAS传输消息后，向电子设备发送下行信息传输(DL  information transfer)消息，该下行信息传输消息中包含TAU接受消息。
步骤507：电子设备接收到该下行信息传输消息后，向该eNB发送上行信息传输(UL information transfer)消息，该上行信息传输消息中包含NAS层的TAU完成(complete)消息。
可选地，电子设备可以通过SRB2向该eNB发送该上行信息传输消息。
步骤508：该eNB接收到该上行信息传输消息后，向EPC发送上行NAS传输(uplink NAS transport)消息，该上行NAS传输消息中包含TAU完成消息。
EPC接收到该TAU完成消息后，TAU流程完成。
至此，电子设备也就完成了小区接入流程及相关的TAU流程。之后，电子设备可以继续执行其他操作来完成EPSFB流程。电子设备完成EPSFB流程后，即成功从5G网络回落至4G网络，那么电子设备可以通过4G网络进行通话。
需说明的是，本申请实施例仅以上文图5实施例为例来对步骤308中电子设备接入第二小区的过程进行示例性说明，上文图5实施例并不对本申请实施例构成限定。电子设备也可以通过不同于上文图5实施例的其他方式接入第二小区，本申请实施例对此不作限定。
需注意的是，上文图3实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤301中电子设备接入第一小区的情况下，不仅可以在步骤302所述的场景下触发后续步骤303至步骤308所述的网络回落流程，也可以在其他存在网络回落需求的场景下触发后续步骤303至步骤308所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
在本申请实施例中，电子设备接收到第一小区发送的测量配置消息后，不仅可以测量第二小区的实际信号强度，还可以测量第二小区的信号质量，并且，每隔第一预设时长，可以根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的实际信号强度进行处理，得到该一个或多个第二小区的目标信号强度。电子设备可以向第一小区发送包括有目标信号强度高于信号强度阈值的第二小区的目标信号强度的测量报告消息。之后，电子设备可以接收第一小区发送的切换命令。由于第二小区的目标信号强度可以反映第二小区的实际信号强度和信号质量的综合水平，所以第一小区在接收到电子设备发送的测量报告消息后，通过该切换命令指示电子设备切换至的第二小区是实际信号强度和信号质量整体都比较好的一个第二小区，因而电子设备在接入这个第二小区时的成功率较高，如此也就提高了网络回落流程的成功率。
在一种可能的实现方式中，本申请实施例提供的小区接入方法用以解决上文图2实施例中的步骤207中电子设备尝试接入4G小区A，但接入失败的问题。接下来在下文图6实施例中对此进行详细说明。
图6是本申请实施例提供的一种小区接入方法的流程图。参见图6，该方法包括如下步骤：
步骤601：电子设备接入第一小区。
步骤601的操作与上文图3实施例中步骤301的操作类似，本申请实施例对此不再赘述。
步骤602：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
步骤602的操作与上文图3实施例中步骤302的操作类似，本申请实施例对此不再赘述。
无论是电子设备向第一小区发送invite消息，还是第一小区向电子设备发送invite消息，由于电子设备不支持通过第一网络进行通话，所以均会触发网络回落流程，即触发从第一网络回落至第二网络的流程，以便电子设备可以通过第二网络进行后续通话。在本申请实施例中，该网络回落流程至少可以包括如下步骤603至步骤607。
步骤603：第一小区向电子设备发送测量配置消息。
步骤603的操作与上文图3实施例中步骤303的操作类似，本申请实施例对此不再赘述。
步骤604：电子设备接收到该测量配置消息后，测量第二小区的信号强度和信号质量。
步骤604的操作与上文图3实施例中步骤304的操作类似，本申请实施例对此不再赘述。
电子设备测量到某个第二小区的信号强度和信号质量后，可以确定这个第二小区的信号强度是否高于信号强度阈值，以及确定这个第二小区的信号质量是否低于信号质量阈值。
信号质量阈值可以预先进行设置。若某个第二小区的信号质量不低于信号质量阈值，说明这个第二小区的信号质量较好；若某个第二小区的信号质量低于信号质量阈值，说明这个第二小区的信号质量较差。
若电子设备测量到某个第二小区的信号强度高于信号强度阈值，且这个第二小区的信号质量不低于信号质量阈值，则电子设备向第一小区上报这个第二小区的信号强度，即电子设备向第一小区发送包括有这个第二小区的信号强度的测量报告消息。第一小区接收到该测量报告消息后，可以向电子设备发送切换命令。电子设备接收到该切换命令后，可以接入该切换命令所指示的一个第二小区。
其中，第一小区向电子设备发送切换命令的操作与上文图3实施例中步骤307的操作类似，本申请实施例对此不再赘述。
其中，电子设备接入该切换命令所指示的一个第二小区的操作与上文图3实施例中步骤308的操作类似，本申请实施例对此不再赘述。
若电子设备测量到某个第二小区的信号强度不高于信号强度阈值，则电子设备不向第一小区上报这个第二小区的信号强度，即电子设备不向第一小区发送包括有这个第二小区的信号强度的测量报告消息。
若电子设备测量到某个第二小区的信号强度高于信号强度阈值，但这个第二小区的信号质量低于信号质量阈值，则电子设备不向第一小区上报这个第二小区的信号强度，即电子设备不向第一小区发送包括有这个第二小区的信号强度的测量报告消息。
也即，无论一个第二小区的信号强度是否高于信号强度阈值，只要这个第二小区的信号质量低于信号质量阈值，电子设备就不向第一小区上报这个第二小区的信号强度，即电子设备就不向第一小区发送包括有这个第二小区的信号强度的测量报告消息，具体如下步骤605所述。
步骤605：若第二小区的信号质量低于信号质量阈值，则电子设备不向第一小区发送 测量报告消息。
若某个第二小区的信号质量低于信号质量阈值，说明这个第二小区的信号质量比较差。在此情况下电子设备不向第一小区发送包括有这个第二小区的信号强度的测量报告消息。
需说明的是，若电子设备接收到该测量配置消息后，测量到的所有第二小区的信号质量均低于信号质量阈值，那么在本申请实施例中电子设备接收到该测量配置消息后将一直不会向第一小区上报任何第二小区的信号强度，即一直不会向第一小区发送测量报告消息。而第一小区在向电子设备发送该测量配置消息后，若超时未接收到电子设备发送的测量报告消息，则会向第一小区发送重定向消息，以触发电子设备进行重定向流程。
步骤606：第一小区向电子设备发送重定向消息。
该重定向消息用于指示电子设备重定向至异系统邻区。示例地，该重定向消息可以为携带有重定向频点(redirectedCarrierInfo)信元的RRC连接释放消息。该重定向频点信元可以包含重定向频点。
步骤607：电子设备接收到该重定向消息后，接入一个第二小区。
电子设备接收到该重定向消息后会执行重定向流程。具体来讲，电子设备可以释放与第一小区的RRC连接，在RRC连接释放后电子设备处于RRC空闲态，然后电子设备可以接入一个第二小区。
在一些实施例中，电子设备释放与第一小区的RRC连接后，可以先搜索该重定向频点对应的第二小区，如果该重定向频点上没有合适的第二小区，则电子设备可以扩大搜索范围，即可以搜索其他频点对应的第二小区，以搜索可能存在的比较好的第二小区再接入。
在本申请实施例中，电子设备接收到第一小区发送的测量配置消息后，若测量到的第二小区的信号质量都比较差，则电子设备不向第一小区发送测量报告消息，以触发第一小区指示电子设备执行重定向流程。由于电子设备执行重定向流程时可以自己选择一个合适的第二小区接入，所以接入成功率比较高。若电子设备成功接入这个第二小区，则可以继续执行其他操作来完成该网络回落流程。电子设备完成该网络回落流程后，即成功从第一网络回落至第二网络，那么电子设备可以通过第二网络进行通话。
在一些实施例中，电子设备接入一个第二小区的操作可以包括如下两种方式：
第一种方式：电子设备接入信号强度高于信号强度阈值且信号质量不低于信号质量阈值的一个第二小区。
由于这个第二小区的信号强度比较好且信号质量也比较好，所以电子设备接入这个第二小区时的成功率比较高。
第二种方式：电子设备接入属于预设小区类型的一个第二小区。
预设小区类型可以预先进行设置。预设小区类型是接入成功率较高的小区类型。因而电子设备在接入属于预设小区类型的第二小区时的成功率较高。
比如，预设小区类型可以为高铁小区，当然，预设小区类型也可以为其他小区类型，本申请实施例对此不作限定。其中，高铁小区为在高铁沿线设立的一些小区，主要用以解决高铁行进过程中乘坐高铁的人员的电子设备的信号差的问题。由于高铁小区一般是专用的，所以不会过于拥塞，另外，有些运营商会把高铁小区和非高铁小区进行隔离，因而接入高通小区时不容易出现问题。由此，在高铁行进过程中，乘坐高铁的人员的电子设备在接入高铁小区时的成功率比较高，且在接入高铁小区后的网络体验也比较好。
可选地，第二小区广播的系统消息中可以携带第二小区的小区类型。这种情况下，电子设备可以解析第二小区的系统消息，得到第二小区的小区类型。
在一些实施例中，步骤607中电子设备可以采用随机接入方式(包括但不限于竞争的随机接入方式)来接入一个第二小区。
需说明的是，电子设备接收到该重定向消息后会释放与第一小区的RRC连接，在RRC连接释放后电子设备处于RRC空闲态。电子设备处于RRC空闲态后，在搜索到一个合适的第二小区后，会驻留于这个第二小区并尝试接入这个第二小区。而由于电子设备驻留的小区发生了变化，所以会触发TAU流程。在TAU流程中电子设备会接入这个第二小区并进行TAU。
接下来结合图7对电子设备接入这个第二小区的一种可能的实现方式进行示例性说明。
假设第二小区为4G小区，那么步骤607中电子设备接入一个4G小区的过程涉及电子设备、该4G小区的eNB、EPC之间的交互，具体如下文图7实施例所述。
图7是本申请实施例提供的一种小区接入过程的示意图。参见图7，该小区接入过程可以包括如下步骤701至步骤708。
步骤701：电子设备向该4G小区的eNB发送随机接入前缀。
示例地，电子设备可以将该随机接入前缀携带于MSG1消息中发送给该eNB。
步骤702：该eNB接收到该随机接入前缀后，向电子设备发送随机接入响应消息。
示例地，该随机接入响应消息也可以称为MSG2消息。
步骤703：电子设备接收到该随机接入响应消息后，向该eNB发送RRC连接请求消息。
示例地，该RRC连接请求消息也可以称为MSG3消息。
步骤704：该eNB接收到该RRC连接请求消息后，向电子设备发送RRC连接建立消息。
示例地，该RRC连接建立消息也可以称为MSG4消息。该RRC连接建立消息可以携带SRB1配置信息。
需说明的是，电子设备接收到该eNB发送的RRC连接建立消息后实际上就已经接入了该4G小区。但是由于电子设备驻留的小区发生了变化，所以电子设备接入该4G小区后还需要进行TAU，以通知网络侧(即该eNB和EPC)自己当前所处的TA。因而电子设备在接收到该RRC连接建立消息后，还会执行如下步骤705至步骤710来进行TAU。
步骤705：电子设备接收到该RRC连接建立消息后，向该eNB发送RRC连接建立完成消息，该RRC连接建立完成消息中包含TAU请求消息。
电子设备接收到该RRC连接建立消息后，可以根据该RRC连接建立消息中的SRB1配置信息配置SRB1，然后可以通过SRB1向该eNB发送该RRC连接建立完成消息。
示例地，TAU请求消息可以包括电子设备当前所处的TA的TAI。
步骤706：该eNB接收到该RRC连接建立完成消息后，向EPC发送初始UE消息，该初始UE消息中包含TAU请求消息。
步骤707：EPC接收到该初始UE消息后，向该eNB发送下行NAS传输消息，该下行NAS传输消息中包含TAU接受消息。
可选地，EPC接收到该初始UE消息后，若确定电子设备是首次接入，那么EPC可以 对电子设备进行鉴权，以为电子设备创建一些与安全相关的参数。
可选地，EPC接收到该初始UE消息后，可以更新电子设备的TA或TA list，更新后会向该eNB发送包含有TAU接受消息的下行NAS传输消息。
步骤708：该eNB接收到该下行NAS传输消息后，向电子设备发送下行信息传输消息，该下行信息传输消息中包含TAU接受消息。
步骤709：电子设备接收到该下行信息传输消息后，向该eNB发送上行信息传输消息，该上行信息传输消息中包含TAU完成消息。
由于电子设备是在RRC空闲态时触发的TAU流程，所以在步骤709中电子设备可以通过SRB1向该eNB发送该上行信息传输消息。
步骤710：该eNB接收到该上行信息传输消息后，向EPC发送上行NAS传输消息，该上行NAS传输消息中包含TAU完成消息。
EPC接收到该TAU完成消息后，TAU流程完成。
至此，电子设备也就完成了小区接入流程及相关的TAU流程。之后，电子设备可以继续执行其他操作来完成EPSFB流程。电子设备完成EPSFB流程后，即成功从5G网络回落至4G网络，那么电子设备可以通过4G网络进行通话。
需说明的是，本申请实施例仅以上文图7实施例为例来对步骤607中电子设备接入一个第二小区的过程进行示例性说明，上文图7实施例并不对本申请实施例构成限定。电子设备也可以通过不同于上文图7实施例的其他方式接入第二小区，本申请实施例对此不作限定。
需注意的是，上文图6实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤601中电子设备接入第一小区的情况下，不仅可以在步骤602所述的场景下触发后续步骤603至步骤607所述的网络回落流程，也可以在其他存在网络回落需求的场景下触发后续步骤603至步骤607所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
在本申请实施例中，电子设备接收到第一小区发送的测量配置消息后，不仅可以测量第二小区的信号强度，还可以测量第二小区的信号质量。若电子设备测量到的第二小区的信号质量低于信号质量阈值，则电子设备不向第一小区发送测量报告消息，以触发第一小区指示电子设备执行重定向流程。由于电子设备执行重定向流程时可以自己选择一个合适的第二小区接入，所以接入成功率比较高，如此也就提高了网络回落流程的成功率。
在一种可能的实现方式中，本申请实施例提供的小区接入方法用以解决上文图2实施例中的步骤207中电子设备尝试接入4G小区A，但接入失败的问题。接下来在下文图8实施例中对此进行详细说明。
图8是本申请实施例提供的一种小区接入方法的流程图。参见图8，该方法包括如下步骤：
步骤801：电子设备接入第一小区。
步骤801的操作与上文图3实施例中步骤301的操作类似，本申请实施例对此不再赘述。
步骤802：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
步骤802的操作与上文图3实施例中步骤302的操作类似，本申请实施例对此不再赘述。
无论是电子设备向第一小区发送invite消息，还是第一小区向电子设备发送invite消息，由于电子设备不支持通过第一网络进行通话，所以均会触发网络回落流程，即触发从第一网络回落至第二网络的流程，以便电子设备可以通过第二网络进行后续通话。在本申请实施例中，该网络回落流程至少可以包括如下步骤803至步骤809。
步骤803：第一小区向电子设备发送测量配置消息。
步骤803的操作与上文图3实施例中步骤303的操作类似，本申请实施例对此不再赘述。
步骤804：电子设备接收到该测量配置消息后，测量第二小区的信号强度。
步骤804的操作与上文图3实施例中步骤304中电子设备测量第二小区的信号强度的操作类似，本申请实施例对此不再赘述。
步骤805：电子设备判断测量的第二小区中是否存在多个特定小区；若测量的第二小区中存在该多个特定小区，则执行步骤806。
该多个特定小区可以是电子设备测量的第二小区中信号强度较高且信号强度相同或相近的一些第二小区。该多个特定小区中每个特定小区的信号强度可以均高于信号强度阈值，且该多个特定小区中任意两个特定小区的信号强度之差小于预设差值。
预设差值可以预先进行设置。预设差值可以设置的比较小。若两个第二小区的信号强度之差小于预设差值，说明这两个第二小区的信号强度相差较小；若两个第二小区的信号强度之差大于或等于预设差值，说明这两个第二小区的信号强度相差较大。
需说明的是，若测量的第二小区中不存在该多个特定小区，那么对于测量的任意一个第二小区，电子设备可以在这个第二小区的信号强度高于信号强度阈值的情况下，向第一小区上报这个第二小区的信号强度，即向第一小区发送包括有这个第二小区的信号强度的测量报告消息。
而若测量的第二小区中存在该多个特定小区，那么对于测量的第二小区中除该多个特定小区之外的其他任意一个第二小区，电子设备可以在这个第二小区的信号强度高于信号强度阈值的情况下，向第一小区上报这个第二小区的信号强度，即向第一小区发送包括有这个第二小区的信号强度的测量报告消息。而对于该多个特定小区，则需要先判断电子设备是否处于预设移动状态，再据此确定是否要上报该多个特定小区的信号强度，具体如下步骤806所述。
步骤806：电子设备判断电子设备是否处于预设移动状态。若电子设备处于预设移动状态，则执行步骤807。
预设移动状态可以预先进行设置。示例地，预设移动状态可以为高速移动状态。
可选地，电子设备判断电子设备是否处于预设移动状态的操作可以为：在电子设备的移动速度大于或等于移动速度阈值的情况下确定电子设备处于预设移动状态，在电子设备的移动速度小于移动速度阈值的情况下确定电子设备未处于预设移动状态。
其中，该移动速度阈值可以预先进行设置。该移动速度阈值可以设置的较大，如该移 动速度阈值可以为100km/h(千米/时)、150km/h、200km/h等，本申请实施例对此不作限定。
需说明的是，若电子设备未处于预设移动状态，那么对于该多个特定小区中任意的一个特定小区，电子设备可以向第一小区上报这个特定小区的信号强度，即向第一小区发送包括有这个特定小区的信号强度的测量报告消息。
而若电子设备处于预设移动状态，那么电子设备测量的第二小区的信号强度会变化的比较快。这种情况下，该多个特定小区的信号强度相同或相近，说明电子设备极有可能正移动到该多个特定小区的相对中间的位置，但很快将移动至其他位置。也就是说，该多个特定小区的信号强度当前虽然相同或相近，但很快将发生变化。可以理解的，该多个特定小区中位于电子设备的移动方向的前方的特定小区的信号强度将很快变强，而位于电子设备的移动方向的后方的特定小区的信号强度将很快变弱。
在此情况下，若直接将该多个特定小区的信号强度上报给第一小区，则由于该多个特定小区的信号强度相同或相近，所以第一小区从中选出的一个第二小区有可能是位于电子设备的移动方向的后方的第二小区。而在电子设备处于预设移动状态的情况下，这个第二小区的信号强度会很快变弱，那么电子设备在后续尝试接入这个第二小区时很有可能会出现接入失败的问题。
由此，本申请实施例为了保证后续电子设备接入第二小区时的成功率，在此情况下先不向第一小区上报该多个特定小区的信号强度，而是在第二预设时长后重新测量该多个特定小区的信号强度。由于经过了第二预设时长，所以此前信号强度相同或相近的该多个特定小区的信号强度已经发生变化，其中位于电子设备的移动方向的前方的特定小区的信号强度变强，而位于电子设备的移动方向的后方的特定小区的信号强度变弱。具体如下步骤807所述。
步骤807：电子设备在第二预设时长后重新测量该多个特定小区的信号强度。
第二预设时长可以预先进行设置。第二预设时长可以设置的较小，如第二预设时长可以为1秒、2秒等，本申请实施例对此不作限定。需说明的是，第一小区发送该测量配置消息后会设置超时时间，第二预设时长小于该超时时间。
对于该多个特定小区中任意的一个特定小区，若相比于前一次测量，本次测量到这个特定小区的信号强度不变或降低，则不向第一小区上报这个特定小区的信号强度，即不向第一小区发送包括有这个特定小区的信号强度的测量报告消息。
而若相比于前一次测量，本次测量到这个特定小区的信号强度增高，则向第一小区上报本次测量到的这个特定小区的信号强度，即向第一小区发送包括有这个特定小区的信号强度的测量报告消息，具体如下步骤808所述。
步骤808：电子设备向第一小区发送测量报告消息。
该测量报告消息包括该多个特定小区中信号强度增高的特定小区的信号强度，进一步还可以包括特定小区的小区标识(包括但不限于PCI)。
示例地，若该多个特定小区中仅存在一个信号强度增高的特定小区，则电子设备可以向第一小区发送一条测量报告消息，这条测量报告消息可以包括这个特定小区的信号强度，进一步还可以包括这个特定小区的小区标识等。
示例地，若该多个特定小区中存在至少两个信号强度增高的特定小区，则电子设备可 以向第一小区发送一条测量报告消息，这条测量报告消息可以包括该至少两个特定小区中每个特定小区的信号强度，进一步还可以包括该至少两个特定小区中每个特定小区的小区标识等；或者，电子设备可以向第一小区发送至少两条测量报告消息，该至少两条测量报告消息中的每条测量报告消息可以包括该至少两个特定小区中的一个特定小区的信号强度，进一步还可以包括这个特定小区的小区标识等；或者，电子设备可以向第一小区发送至少一条测量报告消息，该至少一条测量报告消息中的每条测量报告消息可以包括该至少两个特定小区中的至少一个特定小区的信号强度，进一步还可以包括该至少一个特定小区中每个特定小区的小区标识等。
第一小区接收到电子设备发送的测量报告消息后，可以根据电子设备发送的测量报告消息包括的第二小区的信号强度选择一个第二小区，比如，可以选择信号强度最高的一个第二小区。然后第一小区可以指示电子设备切换至这个第二小区。
本申请实施例中，电子设备在处于预设移动状态时，在发现存在信号强度较高且信号强度相同或相近的多个特定小区的情况下，会延迟至该多个特定小区的信号强度发生变化后，向第一小区上报信号强度增高的特定小区的信号强度。由于相比于位于电子设备的移动方向的后方的第二小区，位于电子设备的移动方向的前方的第二小区的信号强度会随电子设备的移动而增高，所以电子设备向第一小区上报的特定小区大概率是位于电子设备的移动方向的前方的第二小区。这种情况下，第一小区根据电子设备上报的第二小区的信号强度选择的一个第二小区，大概率是位于电子设备的移动方向的前方的一个第二小区。
步骤809：第一小区向电子设备发送切换命令。
步骤809的操作与上文图3实施例中步骤307的操作类似，本申请实施例对此不再赘述。
步骤810：电子设备接收到该切换命令后，接入该切换命令所指示的一个第二小区。
步骤810的操作与上文图3实施例中步骤308的操作类似，本申请实施例对此不再赘述。
由于该切换命令所指示的一个第二小区大概率是位于电子设备的移动方向的前方的一个第二小区，那么随着电子设备的移动，这个第二小区的信号强度会越来越强，所以电子设备在尝试接入这个第二小区时大概率会接入成功。
若电子设备成功接入这个第二小区，则可以继续执行其他操作来完成该网络回落流程。电子设备完成该网络回落流程后，即成功从第一网络回落至第二网络，那么电子设备可以通过第二网络进行通话。
可选地，电子设备接入这个第二小区的一种可能的实现方式可以为上文图5实施例所述的方式，本申请实施例对此不再赘述。
需注意的是，上文图8实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤801中电子设备接入第一小区的情况下，不仅可以在步骤802所述的场景下触发后续步骤803至步骤810所述的网络回落流程，也可以在其他存在网络回落需求的场景下触发后续步骤803至步骤810所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
在本申请实施例中，电子设备接收到第一小区发送的测量配置消息后，测量第二小区 的信号强度。若测量的第二小区中存在信号强度较高且信号强度相同或相近的多个特定小区，则在电子设备处于预设移动状态的情况下，在第二预设时长后重新测量该多个特定小区的信号强度。在重新测量该多个特定小区的信号强度后，向第一小区发送包括有信号强度增高的特定小区的信号强度的测量报告消息。之后，电子设备可以接收第一小区发送的切换命令。由于该切换命令所指示的一个第二小区大概率是位于电子设备的移动方向的前方的一个第二小区，那么随着电子设备的移动，这个第二小区的信号强度会越来越强，所以电子设备在接入这个第二小区时的成功率较高，如此也就提高了网络回落流程的成功率。
在一些实施例中，上文图3实施例至图8实施例提供的三种可能的方式可以进行灵活结合，以更好的提高网络回落流程的成功率。
接下来对上文图3实施例和图6实施例的一种可能的结合方式进行详细地解释说明。
图9是本申请实施例提供的一种小区接入方法的流程图。参见图9，该方法包括如下步骤：
步骤901：电子设备接入第一小区。
步骤901的操作与上文图3实施例中步骤301的操作类似，本申请实施例对此不再赘述。
步骤902：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
步骤902的操作与上文图3实施例中步骤302的操作类似，本申请实施例对此不再赘述。
步骤903：第一小区向电子设备发送测量配置消息。
步骤903的操作与上文图3实施例中步骤303的操作类似，本申请实施例对此不再赘述。
步骤904：电子设备接收到该测量配置消息后，测量第二小区的信号强度和信号质量。
步骤904的操作与上文图3实施例中步骤304的操作类似，本申请实施例对此不再赘述。
步骤905：电子设备接收到该测量配置消息后，每隔第一预设时长，根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度。
步骤905的操作与上文图3实施例中步骤305的操作类似，本申请实施例对此不再赘述。
步骤906：对于该一个或多个第二小区中任意的一个第二小区，电子设备判断这个第二小区的目标信号强度是否高于信号强度阈值且这个第二小区的信号质量是否不低于信号质量阈值。
若这个第二小区的目标信号强度高于信号强度阈值且这个第二小区的信号质量不低于信号质量阈值，则执行如下步骤907至步骤909。若这个第二小区的目标信号强度不高于信号强度阈值，和/或，这个第二小区的信号质量低于信号质量阈值，则执行如下步骤910至步骤912。
步骤907：若这个第二小区的目标信号强度高于信号强度阈值且这个第二小区的信号 质量不低于信号质量阈值，则电子设备向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息。
需说明的是，电子设备接收到该测量配置消息后，每隔第一预设时长，不仅可以获取在第一预设时长内测量的一个或多个第二小区的目标信号强度，还可以在该一个或多个第二小区中存在目标信号强度高于信号强度阈值且信号质量不低于信号质量阈值的第二小区的情况下，向第一小区发送测量报告消息。示例地，一条测量报告消息可以只包括一个第二小区的目标信号强度，进一步还可以包括这个第二小区的小区标识等；或者，一条测量报告消息可以包括至少两个第二小区的目标信号强度，进一步还可以包括该至少两个第二小区中每个第二小区的小区标识等。
步骤907中电子设备向第一小区发送测量报告消息的操作与上文图3实施例中步骤306中电子设备向第一小区发送测量报告消息的操作类似，本申请实施例对此不再赘述。
步骤908：第一小区向电子设备发送切换命令。
步骤908的操作与上文图3实施例中步骤307的操作类似，本申请实施例对此不再赘述。
步骤909：电子设备接收到该切换命令后，接入该切换命令所指示的一个第二小区。
步骤909的操作与上文图3实施例中步骤308的操作类似，本申请实施例对此不再赘述。
步骤910：若这个第二小区的目标信号强度不高于信号强度阈值，和/或，这个第二小区的信号质量低于信号质量阈值，则电子设备不向第一小区发送包括这个第二小区的目标信号强度的测量报告消息。
需说明的是，若电子设备接收到该测量配置消息后，测量到的所有第二小区的信号质量均低于信号质量阈值，那么在本申请实施例中电子设备接收到该测量配置消息后将一直不会向第一小区上报任何第二小区的目标信号强度，即一直不会向第一小区发送测量报告消息。而第一小区在向电子设备发送该测量配置消息后，若超时未接收到电子设备发送的测量报告消息，则会向第一小区发送重定向消息，以触发电子设备进行重定向流程。
步骤910中电子设备不向第一小区发送测量报告消息的操作与上文图6实施例中步骤605中电子设备不向第一小区发送测量报告消息的操作类似，本申请实施例对此不再赘述。
步骤911：第一小区向电子设备发送重定向消息。
步骤911的操作与上文图6实施例中步骤606的操作类似，本申请实施例对此不再赘述。
步骤912：电子设备接收到该重定向消息后，接入一个第二小区。
步骤912的操作与上文图6实施例中步骤607的操作类似，本申请实施例对此不再赘述。
上文图9实施例所获得的技术效果与上文图3实施例和图6实施例中对应的技术手段获得的技术效果近似，本申请实施例对此不再赘述。
需注意的是，上文图9实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤901中电子设备接入第一小区的情况下，不仅可以在步骤902所述的场景下触发后续步骤903至步骤912所述的网络回落流程，也 可以在其他存在网络回落需求的场景下触发后续步骤903至步骤912所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
接下来对上文图3实施例和图8实施例的一种可能的结合方式进行详细地解释说明。
图10是本申请实施例提供的一种小区接入方法的流程图。参见图10，该方法包括如下步骤：
步骤1001：电子设备接入第一小区。
步骤1001的操作与上文图3实施例中步骤301的操作类似，本申请实施例对此不再赘述。
步骤1002：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
步骤1002的操作与上文图3实施例中步骤302的操作类似，本申请实施例对此不再赘述。
步骤1003：第一小区向电子设备发送测量配置消息。
步骤1003的操作与上文图3实施例中步骤303的操作类似，本申请实施例对此不再赘述。
步骤1004：电子设备接收到该测量配置消息后，测量第二小区的信号强度和信号质量。
步骤1004的操作与上文图3实施例中步骤304的操作类似，本申请实施例对此不再赘述。
步骤1005：电子设备接收到该测量配置消息后，每隔第一预设时长，根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度。
步骤1005的操作与上文图3实施例中步骤305的操作类似，本申请实施例对此不再赘述。
步骤1006：电子设备判断该一个或多个第二小区中是否存在多个特定小区；若该一个或多个第二小区中存在该多个特定小区，则执行步骤1007。
该多个特定小区是该一个或多个第二小区中目标信号强度较高且目标信号强度相同或相近的一些第二小区。也即，该多个特定小区中每个特定小区的目标信号强度均高于信号强度阈值，且该多个特定小区中任意两个特定小区的目标信号强度之差小于预设差值。
需说明的是，若该一个或多个第二小区中不存在该多个特定小区，那么对于该一个或多个第二小区中的任意一个第二小区，电子设备可以在这个第二小区的目标信号强度高于信号强度阈值的情况下，向第一小区上报这个第二小区的目标信号强度，即向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息。
而若该一个或多个第二小区中存在该多个特定小区，那么对于该一个或多个第二小区中中除该多个特定小区之外的其他任意一个第二小区，电子设备可以在这个第二小区的目标信号强度高于信号强度阈值的情况下，向第一小区上报这个第二小区的目标信号强度，即向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息。而对于该多个特定小区，则需要先判断电子设备是否处于预设移动状态，再据此确定是否要上报该多个特定小区的目标信号强度，具体如下步骤1007所述。
步骤1007：电子设备判断电子设备是否处于预设移动状态。若电子设备处于预设移动 状态，则执行步骤1008。
需说明的是，若电子设备未处于预设移动状态，那么对于该多个特定小区中任意的一个特定小区，电子设备可以向第一小区上报这个特定小区的目标信号强度，即向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。而若电子设备处于预设移动状态，则执行如下步骤1008。
步骤1008：电子设备在第二预设时长后重新测量该多个特定小区的信号强度和信号质量，并根据测量到的该多个特定小区的信号质量对该多个特定小区的信号强度进行处理，得到该多个特定小区的目标信号强度。
步骤1008中电子设备根据测量到的该多个特定小区的信号质量对该多个特定小区的信号强度进行处理，得到该多个特定小区的目标信号强度的操作与上文图3实施例中步骤305中电子设备根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度的操作类似，本申请实施例对此不再赘述。
对于该多个特定小区中任意的一个特定小区，若相比于前一次测量，本次测量到这个特定小区的目标信号强度不变或降低，则不向第一小区上报这个特定小区的目标信号强度，即不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。
而若相比于前一次测量，本次测量到这个特定小区的目标信号强度增高，则向第一小区上报这个特定小区的目标信号强度，即向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息，具体如下步骤1009所述。
步骤1009：电子设备向第一小区发送测量报告消息。
该测量报告消息包括该多个特定小区中目标信号强度增高的特定小区的目标信号强度，进一步还可以包括特定小区的小区标识(包括但不限于PCI)。
步骤1009的操作与上文图8实施例中步骤808的操作类似，本申请实施例对此不再赘述。
步骤1010：第一小区向电子设备发送切换命令。
步骤1010的操作与上文图3实施例中步骤307的操作类似，本申请实施例对此不再赘述。
步骤1011：电子设备接收到该切换命令后，接入该切换命令所指示的一个第二小区。
步骤1011的操作与上文图3实施例中步骤308的操作类似，本申请实施例对此不再赘述。
上文图10实施例所获得的技术效果与上文图3实施例和图8实施例中对应的技术手段获得的技术效果近似，本申请实施例对此不再赘述。
需注意的是，上文图10实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤1001中电子设备接入第一小区的情况下，不仅可以在步骤1002所述的场景下触发后续步骤1003至步骤1011所述的网络回落流程，也可以在其他存在网络回落需求的场景下触发后续步骤1003至步骤1011所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
接下来对上文图6实施例和图8实施例的一种可能的结合方式进行详细地解释说明。
图11是本申请实施例提供的一种小区接入方法的流程图。参见图11，该方法包括如下步骤：
步骤1101：电子设备接入第一小区。
步骤1101的操作与上文图6实施例中步骤601的操作类似，本申请实施例对此不再赘述。
步骤1102：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
步骤1102的操作与上文图6实施例中步骤602的操作类似，本申请实施例对此不再赘述。
步骤1103：第一小区向电子设备发送测量配置消息。
步骤1103的操作与上文图6实施例中步骤603的操作类似，本申请实施例对此不再赘述。
步骤1104：电子设备接收到该测量配置消息后，测量第二小区的信号强度和信号质量。
步骤1104的操作与上文图6实施例中步骤604的操作类似，本申请实施例对此不再赘述。
步骤1105：电子设备判断测量的第二小区中是否存在多个特定小区；若测量的第二小区中存在该多个特定小区，则执行步骤1106。
该多个特定小区是电子设备测量的第二小区中信号强度较高且信号强度相同或相近的一些第二小区。也即，该多个特定小区中每个特定小区的信号强度均高于信号强度阈值，且该多个特定小区中任意两个特定小区的信号强度之差小于预设差值。
需说明的是，若测量的第二小区中不存在该多个特定小区，那么对于测量的任意一个第二小区，电子设备可以在这个第二小区的信号强度高于信号强度阈值且信号质量不低于信号质量阈值的情况下，向第一小区上报这个第二小区的信号强度，即向第一小区发送包括有这个第二小区的信号强度的测量报告消息。在这个第二小区的信号强度不高于信号强度阈值，和/或，这个第二小区的信号质量低于信号质量阈值的情况下，不向第一小区上报这个第二小区的信号强度，即不向第一小区发送包括有这个第二小区的信号强度的测量报告消息。
而若测量的第二小区中存在该多个特定小区，那么对于测量的第二小区中除该多个特定小区之外的其他任意一个第二小区，电子设备可以在这个第二小区的信号强度高于信号强度阈值且信号质量不低于信号质量阈值的情况下，向第一小区上报这个第二小区的信号强度，即向第一小区发送包括有这个第二小区的信号强度的测量报告消息；在这个第二小区的信号强度不高于信号强度阈值，和/或，这个第二小区的信号质量低于信号质量阈值的情况下，不向第一小区上报这个第二小区的信号强度，即不向第一小区发送包括有这个第二小区的信号强度的测量报告消息。而对于该多个特定小区，则需要先判断电子设备是否处于预设移动状态，再据此确定是否要上报该多个特定小区的信号强度，具体如下步骤1106所述。
步骤1106：电子设备判断电子设备是否处于预设移动状态。若电子设备处于预设移动状态，则执行步骤1107。
需说明的是，若电子设备未处于预设移动状态，那么对于该多个特定小区中任意的一个特定小区，电子设备可以在这个特定小区的信号质量不低于信号质量阈值的情况下向第一小区上报这个特定小区的信号强度，即向第一小区发送包括有这个特定小区的信号强度的测量报告消息；在这个特定小区的信号质量低于信号质量阈值的情况下不向第一小区上报这个特定小区的信号强度，即不向第一小区发送包括有这个特定小区的信号强度的测量报告消息。
若电子设备处于预设移动状态，则执行如下步骤1107。
步骤1107：电子设备在第二预设时长后重新测量该多个特定小区的信号强度和信号质量。
步骤1108：对于该多个特定小区中任意的一个特定小区，电子设备判断这个特定小区的信号强度是否增高且这个特定小区的信号质量是否不低于信号质量阈值。
若这个特定小区的信号强度增高且这个特定小区的信号质量不低于信号质量阈值，则执行如下步骤1109至步骤1111；若这个特定小区的信号强度不变或降低，和/或，这个特定小区的信号质量低于信号质量阈值，则执行步骤1112至步骤1114。
对于该多个特定小区中任意的一个特定小区，若相比于前一次测量，本次测量到这个特定小区的信号强度不变或降低，则不向第一小区上报这个特定小区的信号强度，即不向第一小区发送包括有这个特定小区的信号强度的测量报告消息，具体如下步骤1112所述。
若相比于前一次测量，本次测量到这个特定小区的信号强度增高，则在这个特定小区的信号质量不低于信号质量阈值的情况下向第一小区上报这个特定小区的信号强度，即向第一小区发送包括有这个特定小区的信号强度的测量报告消息，具体如下步骤1109所述；而在这个特定小区的信号质量低于信号质量阈值的情况下不向第一小区上报这个特定小区的信号强度，即不向第一小区发送包括有这个特定小区的信号强度的测量报告消息，具体如下步骤1112所述。
步骤1109：若这个特定小区的信号强度增高且这个特定小区的信号质量不低于信号质量阈值，则电子设备向第一小区发送包括有这个特定小区的信号强度的测量报告消息。
步骤1109中电子设备向第一小区发送测量报告消息的操作与上文图8实施例中步骤808中电子设备向第一小区发送测量报告消息的操作类似，本申请实施例对此不再赘述。
步骤1110：第一小区向电子设备发送切换命令。
步骤1110的操作与上文图8实施例中步骤809的操作类似，本申请实施例对此不再赘述。
步骤1111：电子设备接收到该切换命令后，接入该切换命令所指示的一个第二小区。
步骤1111的操作与上文图8实施例中步骤810的操作类似，本申请实施例对此不再赘述。
步骤1112：若这个特定小区的信号强度不变或降低，和/或，这个特定小区的信号质量低于信号质量阈值，则电子设备不向第一小区发送包括有这个特定小区的信号强度的测量报告消息。
需说明的是，若电子设备接收到该测量配置消息后，测量到的所有第二小区的信号质量均低于信号质量阈值，那么在本申请实施例中电子设备接收到该测量配置消息后将一直不会向第一小区上报任何第二小区的信号强度，即一直不会向第一小区发送测量报告消息。 而第一小区在向电子设备发送该测量配置消息后，若超时未接收到电子设备发送的测量报告消息，则会向第一小区发送重定向消息，以触发电子设备进行重定向流程。
步骤1112中电子设备不向第一小区发送测量报告消息的操作与上文图6实施例中步骤605中电子设备不向第一小区发送测量报告消息的操作类似，本申请实施例对此不再赘述。
步骤1113：第一小区向电子设备发送重定向消息。
步骤1113的操作与上文图6实施例中步骤606的操作类似，本申请实施例对此不再赘述。
步骤1114：电子设备接收到该重定向消息后，接入一个第二小区。
步骤1114的操作与上文图6实施例中步骤607的操作类似，本申请实施例对此不再赘述。
上文图11实施例所获得的技术效果与上文图6实施例和图8实施例中对应的技术手段获得的技术效果近似，本申请实施例对此不再赘述。
需注意的是，上文图11实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤1101中电子设备接入第一小区的情况下，不仅可以在步骤1102所述的场景下触发后续步骤1103至步骤1114所述的网络回落流程，也可以在其他存在网络回落需求的场景下触发后续步骤1103至步骤1114所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
接下来对上文图3实施例、图6实施例和图8实施例的一种可能的结合方式进行详细地解释说明。
图12是本申请实施例提供的一种小区接入方法的流程图。参见图12，该方法包括如下步骤：
步骤1201：电子设备接入第一小区。
步骤1201的操作与上文图3实施例中步骤301的操作类似，本申请实施例对此不再赘述。
步骤1202：电子设备向第一小区发送invite消息，或者，第一小区向电子设备发送invite消息。
步骤1202的操作与上文图3实施例中步骤302的操作类似，本申请实施例对此不再赘述。
步骤1203：第一小区向电子设备发送测量配置消息。
步骤1203的操作与上文图3实施例中步骤303的操作类似，本申请实施例对此不再赘述。
步骤1204：电子设备接收到该测量配置消息后，测量第二小区的信号强度和信号质量。
步骤1204的操作与上文图3实施例中步骤304的操作类似，本申请实施例对此不再赘述。
步骤1205：电子设备接收到该测量配置消息后，每隔第一预设时长，根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进 行处理，得到该一个或多个第二小区的目标信号强度。
步骤1205的操作与上文图3实施例中步骤305的操作类似，本申请实施例对此不再赘述。
步骤1206：电子设备判断该一个或多个第二小区中是否存在多个特定小区；若该一个或多个第二小区中存在该多个特定小区，则执行步骤1207。
该多个特定小区是该一个或多个第二小区中目标信号强度较高且目标信号强度相同或相近的一些第二小区。也即，该多个特定小区中每个特定小区的目标信号强度均高于信号强度阈值，且该多个特定小区中任意两个特定小区的目标信号强度之差小于预设差值。
需说明的是，若该一个或多个第二小区中不存在该多个特定小区，那么对于该一个或多个第二小区中的任意一个第二小区，电子设备可以在这个第二小区的目标信号强度高于信号强度阈值且这个第二小区的信号质量不低于信号质量阈值的情况下，向第一小区上报这个第二小区的目标信号强度，即向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息；在这个第二小区的目标信号强度不高于信号强度阈值，和/或，这个第二小区的信号质量低于信号质量阈值的情况下，不向第一小区上报这个第二小区的目标信号强度，即不向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息。
而若该一个或多个第二小区中存在该多个特定小区，那么对于该一个或多个第二小区中中除该多个特定小区之外的其他任意一个第二小区，电子设备可以在这个第二小区的目标信号强度高于信号强度阈值且这个第二小区的信号质量不低于信号质量阈值的情况下，向第一小区上报这个第二小区的目标信号强度，即向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息；在这个第二小区的目标信号强度不高于信号强度阈值，和/或，这个第二小区的信号质量低于信号质量阈值的情况下，不向第一小区上报这个第二小区的目标信号强度，即不向第一小区发送包括有这个第二小区的目标信号强度的测量报告消息。而对于该多个特定小区，则需要先判断电子设备是否处于预设移动状态，再据此确定是否要上报该多个特定小区的目标信号强度，具体如下步骤1207所述。
步骤1207：电子设备判断电子设备是否处于预设移动状态。若电子设备处于预设移动状态，则执行步骤1208。
需说明的是，若电子设备未处于预设移动状态，那么对于该多个特定小区中任意的一个特定小区，电子设备可以在这个特定小区的信号质量不低于信号质量阈值的情况下向第一小区上报这个特定小区的目标信号强度，即向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息；在这个特定小区的信号质量低于信号质量阈值的情况下不向第一小区上报这个特定小区的目标信号强度，即不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。而若电子设备处于预设移动状态，则执行如下步骤1208。
步骤1208：电子设备在第二预设时长后重新测量该多个特定小区的信号强度和信号质量，并根据测量到的该多个特定小区的信号质量对该多个特定小区的信号强度进行处理，得到该多个特定小区的目标信号强度。
步骤1208中电子设备根据测量到的该多个特定小区的信号质量对该多个特定小区的信号强度进行处理，得到该多个特定小区的目标信号强度的操作与上文图3实施例中步骤305中电子设备根据在第一预设时长内测量到的一个或多个第二小区的信号质量对该一个或多个第二小区的信号强度进行处理，得到该一个或多个第二小区的目标信号强度的操作 类似，本申请实施例对此不再赘述。
步骤1209：对于该多个特定小区中任意的一个特定小区，电子设备判断这个特定小区的目标信号强度是否增高且这个特定小区的信号质量是否不低于信号质量阈值。
若这个特定小区的目标信号强度增高且这个特定小区的信号质量不低于信号质量阈值，则执行如下步骤1210至步骤1212；若这个特定小区的目标信号强度不变或降低，和/或，这个特定小区的信号质量低于信号质量阈值，则执行步骤1213至步骤1215。
对于该多个特定小区中任意的一个特定小区，若相比于前一次测量，本次测量到这个特定小区的目标信号强度不变或降低，则不向第一小区上报这个特定小区的目标信号强度，即不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息，具体如下步骤1213所述。
若相比于前一次测量，本次测量到这个特定小区的目标信号强度增高，则在这个特定小区的信号质量不低于信号质量阈值的情况下向第一小区上报这个特定小区的目标信号强度，即向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息，具体如下步骤1210所述；而在这个特定小区的信号质量低于信号质量阈值的情况下不向第一小区上报这个特定小区的目标信号强度，即不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息，具体如下步骤1213所述。
步骤1210：若这个特定小区的目标信号强度增高且这个特定小区的信号质量不低于信号质量阈值，则电子设备向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。
步骤1210中电子设备向第一小区发送测量报告消息的操作与上文图8实施例中步骤808中电子设备向第一小区发送测量报告消息的操作类似，本申请实施例对此不再赘述。
步骤1211：第一小区向电子设备发送切换命令。
步骤1211的操作与上文图8实施例中步骤809的操作类似，本申请实施例对此不再赘述。
步骤1212：电子设备接收到该切换命令后，接入该切换命令所指示的一个第二小区。
步骤1212的操作与上文图8实施例中步骤810的操作类似，本申请实施例对此不再赘述。
步骤1213：若这个特定小区的目标信号强度不变或降低，和/或，这个特定小区的信号质量低于信号质量阈值，则电子设备不向第一小区发送包括有这个特定小区的目标信号强度的测量报告消息。
需说明的是，若电子设备接收到该测量配置消息后，测量到的所有第二小区的信号质量均低于信号质量阈值，那么在本申请实施例中电子设备接收到该测量配置消息后将一直不会向第一小区上报任何第二小区的目标信号强度，即一直不会向第一小区发送测量报告消息。而第一小区在向电子设备发送该测量配置消息后，若超时未接收到电子设备发送的测量报告消息，则会向第一小区发送重定向消息，以触发电子设备进行重定向流程。
步骤1213中电子设备不向第一小区发送测量报告消息的操作与上文图6实施例中步骤605中电子设备不向第一小区发送测量报告消息的操作类似，本申请实施例对此不再赘述。
步骤1214：第一小区向电子设备发送重定向消息。
步骤1214的操作与上文图6实施例中步骤606的操作类似，本申请实施例对此不再赘述。
步骤1215：电子设备接收到该重定向消息后，接入一个第二小区。
步骤1215的操作与上文图6实施例中步骤607的操作类似，本申请实施例对此不再赘述。
上文图12实施例所获得的技术效果与上文图3实施例、图6实施例和图8实施例中对应的技术手段获得的技术效果近似，本申请实施例对此不再赘述。
需注意的是，上文图12实施例仅是以呼叫场景触发网络回落流程为例来进行示例性说明，实际应用中，因其他场景触发的网络回落流程也可以通过本申请实施例提供的小区接入方法实现。也就是说，本申请实施例中在步骤1201中电子设备接入第一小区的情况下，不仅可以在步骤1202所述的场景下触发后续步骤1203至步骤1215所述的网络回落流程，也可以在其他存在网络回落需求的场景下触发后续步骤1203至步骤1215所述的网络回落流程。本申请实施例提供的小区接入方法可以提高各种场景下触发的网络回落流程的成功率。
在一种可能的实现方式中，本申请实施例提供的小区接入方法用以解决上文图2实施例中的步骤211中电子设备向4G小区B发送RRC连接重建完成消息后，电子设备等待了过长时间的问题。接下来在下文图13实施例和图14实施例中对此进行详细说明。
需说明的是，图13实施例或图14实施例可以在电子设备触发RLF流程的情况下执行。比如，在上文图2实施例中，电子设备在步骤208中触发RLF流程时可以执行下文图13实施例或图14实施例。或者，在上文图3实施例中，电子设备在步骤308中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。或者，在上文图6实施例中，电子设备在步骤607中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。或者，在上文图8实施例中，电子设备在步骤809中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。类似地，在上文图9实施例中，电子设备在步骤909或步骤912中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。或者，在上文图10实施例中，电子设备在步骤1011中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。或者，在上文图11实施例中，电子设备在步骤1111或步骤1114中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。或者，在上文图12实施例中，电子设备在步骤1212或步骤1215中接入一个第二小区失败时可以触发RLF流程，然后可以执行下文图13实施例或图14实施例。当然，电子设备也可以在其他情况下触发RLF流程，然后执行下文图13实施例或图14实施例。
图13是本申请实施例提供的一种小区接入方法的流程图。参见图13，该方法包括如下步骤：
步骤1301：电子设备触发RLF流程。
RLF流程涉及小区选择流程和RRC连接重建流程，该RRC连接重建流程旨在重建RRC连接。那么电子设备在触发RLF流程后，可先选择一个小区(后文称为目标小区)， 然后电子设备可驻留于目标小区，再建立与目标小区的RRC连接，以接入目标小区，具体如下步骤1302至步骤1306所述。
示例地，电子设备接收到第一小区发送的切换命令后，在接入该切换命令所指示的一个第二小区失败时可以触发RLF流程。这种情况下，目标小区为第二小区。
步骤1302：电子设备向目标小区发送RRC连接重建请求消息。
可选地，该RRC连接重建请求消息中可以携带重建原因。示例地，因RLF触发的重建原因可以为“otherFailure”。
步骤1303：目标小区接收到该RRC连接重建请求消息后，向电子设备发送RRC连接重建消息，该RRC连接重建消息携带SRB1配置信息。
步骤1304：电子设备接收到该RRC连接重建消息后，根据该SRB1配置信息配置SRB1。
步骤1305：电子设备向目标小区发送RRC连接重建完成消息。
示例地，电子设备可以通过SRB1向目标小区发送RRC连接重建完成消息。
电子设备向目标小区发送RRC连接重建完成消息后，电子设备即已建立了与目标小区的RRC连接，此时电子设备处于RRC连接态。
这种情况下，电子设备实际上已经接入了目标小区。但是由于电子设备驻留的小区发生了变化，所以电子设备在接入目标小区后还需要进行TAU。一般情况下，电子设备在RRC连接态时需要通过SRB2进行TAU，因而电子设备在向目标小区发送RRC连接重建完成消息后，需要等待目标小区发送的RRC重配置消息来配置SRB2和DRB，继而才能通过SRB2进行TAU。
相关技术中，电子设备在向目标小区发送RRC连接重建完成消息后只能一直等待目标小区发送的用于配置SRB2的RRC重配置消息。
而本申请实施例中，为了防止电子设备在向目标小区发送RRC连接重建完成消息后等待过长时间而导致TAU失败，继而导致相关的网络回落流程等失败的问题，电子设备在向目标小区发送RRC连接重建完成消息后会设置定时器。该定时器的时长可以预先进行设置，本申请实施例中将该定时器的时长称为第三预设时长。
若电子设备在该定时器未超时的情况下，即电子设备在向目标小区发送RRC连接重建完成消息后的第三预设时长内，接收到目标小区发送的RRC重配置消息，则电子设备可以根据该RRC重配置消息中的SRB2配置信息来配置SRB2，然后通过SRB2进行TAU。此时TAU可正常进行，其相关的网络回落流程等也可继续正常进行。
而若电子设备在该定时器超时的情况下，即电子设备在向目标小区发送RRC连接重建完成消息后的第三预设时长后，仍未接收到目标小区发送的RRC重配置消息，则电子设备可以通过SRB1进行TAU，具体如下所述。
步骤1306：电子设备若在向目标小区发送RRC连接重建完成消息的第三预设时长后未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则通过SRB1进行TAU。
第三预设时长可以预先进行设置。可选地，第三预设时长的设置可以是基于这样的原则：在第三预设时长超时时，即使没有收到网络侧发的用于配置SRB2的RRC重配置消息的情况下，电子设备都不会收到网络侧发的RRC连接释放消息。示例地，第三预设时长可以小于前述的5秒(即会导致收到网络侧发的RRC连接释放消息的5秒)，具体可以为2 秒、或3秒等，本申请实施例对此不作限定。
在一些实施例中，不同的用户场景可对应不同的第三预设时长。该用户场景是指用户的使用场景，即用户正在使用电子设备做什么事情。该用户场景可以反映用户需求。
这种情况下，对网络时延要求较高的用户场景对应的第三预设时长可相对较短。对网络时延要求较低的用户场景对应的第三预设时长可相对较长。比如，若电子设备所处的用户场景为通话场景，则第三预设时长可相对较短，如可以为2秒、3秒等。若电子设备所处的用户场景为网页浏览场景，则第三预设时长可相对较长，如可以为7秒、8秒等。
在本申请实施例中，电子设备在向目标小区发送RRC连接重建完成消息后，若超过第三预设时长仍未接收到目标小区发送的RRC重配置消息，则可以在当前电子设备处于RRC连接态的情况下直接通过SRB1进行TAU(区别于现有的一些技术中在当前电子设备处于RRC连接态的情况下只能通过SRB2进行TAU)。如此可以保证TAU的正常进行，继而可以提高相关的网络回落流程等的成功率。
接下来结合图14对电子设备通过SRB1进行TAU的一种可能的实现方式进行示例性说明。
假设目标小区为4G小区，那么电子设备通过SRB1进行TAU的过程涉及电子设备、该4G小区的eNB、EPC之间的交互，具体如下文图14实施例所述。
图14是本申请实施例提供的一种TAU过程的示意图。参见图14，该TAU过程可以包括如下步骤1401至步骤1406。
步骤1401：电子设备通过SRB1向该4G小区的eNB发送上行信息传输消息，该上行信息传输消息中包含TAU请求消息。
步骤1402：该eNB接收到该上行信息传输消息后，向EPC发送上行NAS传输消息，该上行NAS传输消息中包含TAU请求消息。
步骤1403：EPC接收到该上行NAS传输消息后，向该eNB发送下行NAS传输消息，该下行NAS传输消息中包含TAU接受消息。
可选地，EPC接收到该上行NAS传输消息后，可以更新电子设备的TA或TA list，更新后会向该eNB发送包含有TAU接受消息的下行NAS传输消息。
步骤1404：该eNB接收到该下行NAS传输消息后，向电子设备发送下行信息传输消息，该下行信息传输消息中包含TAU接受消息。
步骤1405：电子设备接收到该下行信息传输消息后，通过SRB1向该eNB发送上行信息传输消息，该上行信息传输消息中包含TAU完成消息。
步骤1406：该eNB接收到该上行信息传输消息后，向EPC发送上行NAS传输消息，该上行NAS传输消息中包含TAU完成消息。
EPC接收到该TAU完成消息后，TAU流程完成。
在一些情况中，若电子设备是在EPSFB流程中执行的TAU流程，那么电子设备完成TAU流程后可以继续执行其他操作来完成EPSFB流程。电子设备完成EPSFB流程后，即成功从5G网络回落至4G网络。
需说明的是，本申请实施例仅以上文图14实施例为例来对步骤1306中电子设备通过SRB1进行TAU的过程进行示例性说明，上文图14实施例并不对本申请实施例构成限定。电子设备也可以通过不同于上文图14实施例的其他方式来通过SRB1进行TAU，本申请 实施例对此不作限定。
在一些实施例中，电子设备若在向目标小区发送RRC连接重建完成消息后的第三预设时长内接收到目标小区发送的RRC重配置消息，则电子设备可以根据该RRC重配置消息中的SRB2配置信息来配置SRB2，然后通过SRB2进行TAU。作为一种示例，电子设备通过SRB2进行TAU的过程与上文图14实施例类似，区别仅在于在步骤1401和步骤1405中电子设备均是通过SRB2向该eNB发送上行信息传输消息。
在本申请实施例中，电子设备若触发RLF流程，则向目标小区发送RRC连接重建请求消息。之后，电子设备若接收到目标小区发送的RRC连接重建消息，则根据该RRC连接重建消息中的SRB1配置信息配置SRB1，且向目标小区发送RRC连接重建完成消息。电子设备在向目标小区发送RRC连接重建完成消息后，若超过第三预设时长仍未接收到目标小区发送的用于配置SRB2的RRC重配置消息，则通过SRB1进行TAU。如此可以保证TAU的正常进行，继而可以提高相关的网络回落流程等的成功率。
图15是本申请实施例提供的一种小区接入方法的流程图。参见图15，该方法包括如下步骤：
步骤1501：电子设备触发RLF流程。
RLF流程涉及小区选择流程和RRC连接重建流程，该RRC连接重建流程旨在重建RRC连接。那么电子设备在触发RLF流程后，可先选择一个小区(后文称为第一目标小区)，然后电子设备可驻留于第一目标小区，再建立与第一目标小区的RRC连接，以接入第一目标小区，具体如下步骤1502至步骤1506所述。
示例地，电子设备接收到第一小区发送的切换命令后，在接入该切换命令所指示的一个第二小区失败时可以触发RLF流程。这种情况下，第一目标小区为第二小区。
步骤1502：电子设备向第一目标小区发送RRC连接重建请求消息。
可选地，该RRC连接重建请求消息中可以携带重建原因。示例地，因RLF触发的重建原因可以为“otherFailure”。
步骤1503：第一目标小区接收到该RRC连接重建请求消息后，向电子设备发送RRC连接重建消息。
示例地，该RRC连接重建消息携带SRB1配置信息。
步骤1504：电子设备接收到该RRC连接重建消息后，向第一目标小区发送RRC连接重建完成消息。
示例地，电子设备接收到该RRC连接重建消息后，可以根据该SRB1配置信息配置SRB1，然后通过SRB1向第一目标小区发送RRC连接重建完成消息。
电子设备向第一目标小区发送RRC连接重建完成消息后，电子设备即已重建了与第一目标小区的RRC连接，此时电子设备处于RRC连接态。
这种情况下，电子设备实际上已经接入了第一目标小区。但是由于电子设备驻留的小区发生了变化，所以电子设备在接入第一目标小区后还需要进行TAU。一般情况下，电子设备在RRC连接态时需要通过SRB2进行TAU，因而电子设备在向第一目标小区发送RRC连接重建完成消息后，需要等待第一目标小区发送的RRC重配置消息来配置SRB2和DRB，继而才能通过SRB2进行TAU。
相关技术中，电子设备在向第一目标小区发送RRC连接重建完成消息后只能一直等 待第一目标小区发送的用于配置SRB2的RRC重配置消息。
而本申请实施例中，为了防止电子设备在向第一目标小区发送RRC连接重建完成消息后等待过长时间而导致RRC连接重建流程失败，继而导致相关的网络回落流程等失败的问题，电子设备在向第一目标小区发送RRC连接重建完成消息后会设置定时器。该定时器的时长可以预先进行设置，本申请实施例中将该定时器的时长称为第四预设时长。
若电子设备在该定时器未超时的情况下，即电子设备在向第一目标小区发送RRC连接重建完成消息后的第四预设时长内，接收到第一目标小区发送的RRC重配置消息，则电子设备可以根据该RRC重配置消息中的SRB2配置信息来配置SRB2，然后通过SRB2进行TAU。此时TAU可正常进行，其相关的网络回落流程等也可继续正常进行。
而若电子设备在该定时器超时的情况下，即电子设备在向第一目标小区发送RRC连接重建完成消息后的第四预设时长后，仍未接收到第一目标小区发送的RRC重配置消息，则电子设备可以触发RLF流程，以触发换小区重建，具体如下所述。
步骤1505：电子设备若在向第一目标小区发送RRC连接重建完成消息的第四预设时长后未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程。
第四预设时长可以预先进行设置。可选地，第四预设时长的设置可以是基于这样的原则：在第四预设时长超时时，即使没有收到网络侧发的用于配置SRB2的RRC重配置消息的情况下，电子设备都不会收到网络侧发的RRC连接释放消息。示例地，第四预设时长可以小于前述的5秒(即会导致收到网络侧发的RRC连接释放消息的5秒)，具体可以为2秒、或3秒等，本申请实施例对此不作限定。
在一些实施例中，不同的用户场景可对应不同的第四预设时长。该用户场景是指用户的使用场景，即用户正在使用电子设备做什么事情。该用户场景可以反映用户需求。
这种情况下，对网络时延要求较高的用户场景对应的第四预设时长可相对较短。对网络时延要求较低的用户场景对应的第四预设时长可相对较长。比如，若电子设备所处的用户场景为通话场景，则第四预设时长可相对较短，如可以为1秒、2秒等。若电子设备所处的用户场景为网页浏览场景，则第四预设时长可相对较长，如可以为5秒、6秒等。
电子设备在向第一目标小区发送RRC连接重建完成消息后，若超过第四预设时长仍未接收到第一目标小区发送的RRC重配置消息，那么电子设备与第一目标小区间的RRC连接重建流程很大概率会失败。本申请实施例中在此情况下电子设备可以直接触发RLF流程，以触发换小区重建。如此可以尽快更换小区进行RRC连接重建流程，避免电子设备长时间无意义等待，继而可以提高相关的网络回落流程等的成功率。
步骤1506：电子设备与第二目标小区进行RRC连接重建流程。
电子设备在触发RLF流程后，可以先释放与第一目标小区的RRC连接，再选择一个小区(即第二目标小区)，之后，电子设备可先驻留于第二目标小区，再建立与第二目标小区的RRC连接，以接入第二目标小区。
在一些实施例中，电子设备接收到第一小区发送的切换命令后，在接入该切换命令所指示的一个第二小区失败时可以触发RLF流程，然后可以选择一个第二小区作为第一目标小区，与第一目标小区进行RRC连接重建流程。电子设备在与第一目标小区进行RRC连接重建流程的过程中，若在向第一目标小区发送RRC连接重建完成消息的第四预设时长后未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程， 然后可以继续选择一个第二小区作为第二目标小区，与第二目标小区进行RRC连接重建流程。
其中，电子设备与第二目标小区进行RRC连接重建流程的过程与电子设备与第一目标小区进行RRC连接重建流程的过程类似，本申请实施例对此不再赘述。
在一些实施例中，电子设备与第二目标小区进行RRC连接重建流程的过程中，若电子设备在向第二目标小区发送RRC连接重建完成消息的第四预设时长后未接收到第二目标小区发送的用于配置SRB2的RRC重配置消息，则可以触发RLF流程，继续选择小区进行RRC连接重建流程。
在本申请实施例中，电子设备若触发RLF流程，则向第一目标小区发送RRC连接重建请求消息。之后，电子设备若接收到第一目标小区发送的RRC连接重建消息，则向第一目标小区发送RRC连接重建完成消息。电子设备在向第一目标小区发送RRC连接重建完成消息后，若超过第四预设时长仍未接收到第一目标小区发送的用于配置SRB2的RRC重配置消息，则电子设备不再继续等待第一目标小区发送RRC重配置消息，而是直接触发RLF流程，以尽快更换小区进行RRC连接重建流程。如此，可以避免RRC连接重建流程中电子设备的长时间无意义等待，继而可以提高相关的网络回落流程等的成功率。
下面对本申请实施例涉及的电子设备予以说明。
图16是本申请实施例提供的一种电子设备的结构示意图。参见图16，电子设备100可以包括处理器110，外部存储器接口120，内部存储器121，通用串行总线(universal serial bus，USB)接口130，充电管理模块140，电源管理模块141，电池142，天线1，天线2，移动通信模块150，无线通信模块160，音频模块170，扬声器170A，受话器170B，麦克风170C，耳机接口170D，传感器模块180，按键190，马达191，指示器192，摄像头193，显示屏194，以及用户标识模块(subscriber identification module，SIM)卡接口195等。其中，传感器模块180可以包括压力传感器180A，陀螺仪传感器180B，气压传感器180C，磁传感器180D，加速度传感器180E，距离传感器180F，接近光传感器180G，指纹传感器180H，温度传感器180J，触摸传感器180K，环境光传感器180L，骨传导传感器180M等。
可以理解的是，本申请实施例示意的结构并不构成对电子设备100的具体限定。在本申请另一些实施例中，电子设备100可以包括比图示更多或更少的部件，或者组合某些部件，或者拆分某些部件，或者不同的部件布置。图示的部件可以以硬件，软件，或软件和硬件的组合实现。
处理器110可以包括一个或多个处理单元，比如：处理器110可以包括应用处理器(application processor，AP)，调制解调处理器(Modem，也可称之为基带处理器)，图形处理器(graphics processing unit，GPU)，图像信号处理器(image signal processor，ISP)，控制器，存储器，视频编解码器，数字信号处理器(digital signal processor，DSP)，和/或神经网络处理器(neural-network processing unit，NPU)等。其中，不同的处理单元可以是独立的器件，也可以集成在一个或多个处理器中。
其中，控制器可以是电子设备100的神经中枢和指挥中心。控制器可以根据指令操作码和时序信号，产生操作控制信号，完成取指令和执行指令的控制。
处理器110中还可以设置存储器，用于存储指令和数据。在一些实施例中，处理器110 中的存储器为高速缓冲存储器。该存储器可以保存处理器110刚用过或循环使用的指令或数据。如果处理器110需要再次使用该指令或数据，可从该存储器中直接调用。避免了重复存取，减少了处理器110的等待时间，因而提高了系统的效率。
电子设备100的无线通信功能可以通过天线1，天线2，移动通信模块150，无线通信模块160，Modem等实现。
天线1和天线2用于发射和接收电磁波信号。电子设备100中的每个天线可用于覆盖单个或多个通信频带。不同的天线还可以复用，以提高天线的利用率。比如：可以将天线1复用为无线局域网的分集天线。在另外一些实施例中，天线可以和调谐开关结合使用。
移动通信模块150可以提供应用在电子设备100上的包括2G/3G/4G/5G等无线通信的解决方案。移动通信模块150可以包括至少一个滤波器，开关，功率放大器，低噪声放大器(low noise amplifier，LNA)等。移动通信模块150可以由天线1接收电磁波，并对接收的电磁波进行滤波，放大等处理，传送至调制解调处理器进行解调。移动通信模块150还可以对经调制解调处理器调制后的信号放大，经天线1转为电磁波辐射出去。在一些实施例中，移动通信模块150的至少部分功能模块可以被设置于处理器110中。在一些实施例中，移动通信模块150的至少部分功能模块可以与处理器110的至少部分模块被设置在同一个器件中。
无线通信模块160可以提供应用在电子设备100上的包括无线局域网(wireless local area networks，WLAN)(如无线保真(wireless fidelity，Wi-Fi)网络)，蓝牙(bluetooth，BT)，全球导航卫星系统(global navigation satellite system，GNSS)，调频(frequency modulation，FM)，近距离无线通信技术(near field communication，NFC)，红外技术(infrared，IR)等无线通信的解决方案。无线通信模块160可以是集成至少一个通信处理模块的一个或多个器件。无线通信模块160经由天线2接收电磁波，将电磁波信号调频以及滤波处理，将处理后的信号发送到处理器110。无线通信模块160还可以从处理器110接收待发送的信号，对其进行调频，放大，经天线2转为电磁波辐射出去。
在一些实施例中，电子设备100的天线1和移动通信模块150耦合，天线2和无线通信模块160耦合，使得电子设备100可以通过无线通信技术与网络以及其他设备通信。无线通信技术可以包括全球移动通讯系统(global system for mobile communications，GSM)，通用分组无线服务(general packet radio service，GPRS)，码分多址接入(code division multiple access，CDMA)，宽带码分多址(wideband code division multiple access，WCDMA)，时分码分多址(time-division code division multiple access，TD-SCDMA)，长期演进(long term evolution，LTE)，BT，GNSS，WLAN，NFC，FM，和/或IR技术等。GNSS可以包括全球卫星定位系统(global positioning system，GPS)，全球导航卫星系统(global navigation satellite system，GLONASS)，北斗卫星导航系统(beidou navigation satellite system，BDS)，准天顶卫星系统(quasi-zenith satellite system，QZSS)和/或星基增强系统(satellite based augmentation systems，SBAS)。
SIM卡接口195用于连接SIM卡。SIM卡可以通过插入SIM卡接口195，或从SIM卡接口195拔出，实现和电子设备100的接触和分离。电子设备100可以支持1个或N个SIM卡接口，N为大于1的整数。SIM卡接口195可以支持Nano SIM卡，Micro SIM卡，SIM卡等。同一个SIM卡接口195可以同时插入多张卡。多张卡的类型可以相同，也可以 不同。SIM卡接口195也可以兼容不同类型的SIM卡。SIM卡接口195也可以兼容外部存储卡。电子设备100通过SIM卡和网络交互，实现通话以及数据通信等功能。在一些实施例中，电子设备100采用eSIM，即：嵌入式SIM卡。eSIM卡可以嵌在电子设备100中，不能和电子设备100分离。
在本申请实施例中，在上述部件之上，运行有操作系统。例如苹果公司开发的iOS操作系统，谷歌公司开发的Android开源操作系统，微软公司开发的Windows操作系统等。
电子设备100的操作系统可以采用分层架构，事件驱动架构，微核架构，微服务架构，或云架构。本申请实施例以分层架构的Android系统为例，示例性说明电子设备100的软硬件结构。需要说明的是，本申请实施例虽然以Android系统为例进行说明，但是其基本原理同样适用于基于iOS或Windows等操作系统的电子设备100。
图17是本申请实施例提供的一种电子设备100的软件结构框图。软件结构采用分层架构，分层架构将软件分成若干个层，每一层都有清晰的角色和分工。层与层之间通过软件接口通信。以Android系统运行在AP上为例，在一些实施例中，将Android系统分为五层，从上至下分别为应用程序层、应用程序框架层(Framework)、安卓运行时(Android runtime)和系统库、硬件抽象层(hardware abstraction layer，HAL)以及内核层(Kernel)。
应用程序层可以包括一系列应用程序包。应用程序包可以包括相机、图库、日历、通话、地图、无线局域网(wireless local area network，WLAN)、蓝牙、音乐、视频、短信息等。应用程序层还可以包括systemUI(系统UI)，systemUI用于显示电子设备100的界面，如显示SIM卡对应的信号图标、显示通话界面等。
应用程序框架层为应用程序层的应用程序提供应用编程接口(application programming interface，API)和编程框架。应用程序框架层包括一些预先定义的函数。例如，应用程序框架层可以包括窗口管理器、内容提供器、视图系统、电话管理器、资源管理器、通知管理器等。电话管理器用于提供电子设备100的通话功能，如通话状态的管理(包括接通，挂断等)。电话管理器在图17中通过telephony表示。应用程序框架层还可以包括无线通信接口层(radio interface layer，RIL)。Modem可以通过RIL与telephony进行信息交互。
Modem可以包括NAS层、RRC层、分组数据汇聚协议(packet data convergence protocol，PDCP)层、无线链路层控制协议(radio link control，RLC)层、介质访问控制(medium access control，MAC)层和物理(Physical，PHY)层。前述各层可以是软件模块。Modem可以通过天线与基站进行交互。可选地，本申请实施例提供的方法可以由Modem实施。
本申请的一些实施例提供一种电子设备，电子设备包括：一个或多个处理器以及存储器；存储器用于存储计算机程序代码，计算机程序代码包括计算机指令，当一个或多个处理器执行计算机指令时，使得电子设备执行上述小区接入方法。
本申请的一些实施例提供一种芯片系统，应用于电子设备，芯片系统包括至少一个处理器以及接口，接口用于接收指令，并传输至至少一个处理器；至少一个处理器运行指令使得电子设备执行上述小区接入方法。其中，芯片系统可以是Modem，或包括Modem的片上系统(system on chip，Soc)，上述方法可以由一个Modem实施。
在上述实施例中，可以全部或部分地通过软件、硬件、固件或者其任意结合来实现。当使用软件实现时，可以全部或部分地以计算机程序产品的形式实现。所述计算机程序产品包括一个或多个计算机指令。在计算机上加载和执行所述计算机指令时，全部或部分地 产生按照本申请实施例所述的流程或功能。所述计算机可以是通用计算机、专用计算机、计算机网络或其他可编程装置。所述计算机指令可以存储在计算机可读存储介质中，或者从一个计算机可读存储介质向另一个计算机可读存储介质传输，比如，所述计算机指令可以从一个网站站点、计算机、服务器或数据中心通过有线(比如：同轴电缆、光纤、数据用户线(Digital Subscriber Line，DSL))或无线(比如：红外、无线、微波等)方式向另一个网站站点、计算机、服务器或数据中心进行传输。所述计算机可读存储介质可以是计算机能够存取的任何可用介质，或者是包含一个或多个可用介质集成的服务器、数据中心等数据存储设备。所述可用介质可以是磁性介质(比如：软盘、硬盘、磁带)、光介质(比如：数字通用光盘(Digital Versatile Disc，DVD))或半导体介质(比如：固态硬盘(Solid State Disk，SSD))等。
以上所述为本申请提供的可选实施例，并不用以限制本申请，凡在本申请的揭露的技术范围之内，所作的任何修改、等同替换、改进等，均应包含在本申请的保护范围之内。

Claims (26)

  1. 一种小区接入方法，其特征在于，应用于电子设备，所述方法包括：
    接收第一小区发送的测量配置消息，所述测量配置消息用于指示测量异系统邻区信号强度；
    测量第二小区的信号强度和信号质量，所述第二小区为所述第一小区的异系统邻区；
    每隔第一预设时长，根据在所述第一预设时长内测量到的一个或多个第二小区的信号质量对所述一个或多个第二小区的信号强度进行处理，得到所述一个或多个第二小区的目标信号强度；
    向所述第一小区发送测量报告消息，所述测量报告消息包括所述一个或多个第二小区中目标信号强度高于信号强度阈值的第二小区的目标信号强度；
    若接收到所述第一小区发送的切换命令，则接入所述切换命令所指示的一个第二小区。
  2. 如权利要求1所述的方法，其特征在于，所述接收第一小区发送的测量配置消息之前，还包括：
    接收所述第一小区发送的邀请invite消息；或者，
    向所述第一小区发送invite消息。
  3. 如权利要求1或2所述的方法，其特征在于，所述根据在所述第一预设时长内测量到的一个或多个第二小区的信号质量对所述一个或多个第二小区的信号强度进行处理，得到所述一个或多个第二小区的目标信号强度，包括：
    根据所述一个或多个第二小区中每个第二小区的信号质量，确定所述每个第二小区对应的权重；
    将所述每个第二小区的信号强度与对应的权重相乘，得到所述每个第二小区的目标信号强度。
  4. 如权利要求1至3任一所述的方法，其特征在于，所述向所述第一小区发送测量报告消息，包括：
    对于所述一个或多个第二小区中任意的一个第二小区，若所述一个第二小区的目标信号强度高于信号强度阈值且信号质量不低于信号质量阈值，则向所述第一小区发送包括有所述一个第二小区的目标信号强度的测量报告消息；
    所述方法还包括：
    若所述一个第二小区的目标信号强度不高于信号强度阈值，和/或，若所述一个第二小区的信号质量低于信号质量阈值，则不向所述第一小区发送包括有所述一个第二小区的目标信号强度的测量报告消息。
  5. 如权利要求1至3任一所述的方法，其特征在于，所述向所述第一小区发送测量报告消息，包括：
    若所述一个或多个第二小区中不存在目标信号强度高于信号强度阈值且目标信号强度之差小于预设差值的多个特定小区，则向所述第一小区发送所述测量报告消息。
  6. 如权利要求5所述的方法，其特征在于，所述方法还包括：
    若所述一个或多个第二小区中存在所述多个特定小区，则在所述电子设备处于预设移动状态的情况下，在第二预设时长后重新测量所述多个特定小区的信号强度和信号质量， 并根据所述多个特定小区的信号质量对所述多个特定小区的信号强度进行处理，得到所述多个特定小区的目标信号强度；
    对于所述多个特定小区中任意的一个特定小区，若所述一个特定小区的目标信号强度增高，则向所述第一小区发送包括有所述一个特定小区的目标信号强度的测量报告消息；若所述一个特定小区的目标信号强度不变或降低，则不向所述第一小区发送包括有所述一个特定小区的目标信号强度的测量报告消息。
  7. 如权利要求5所述的方法，其特征在于，所述方法还包括：
    若所述一个或多个第二小区中存在所述多个特定小区，则在所述电子设备处于预设移动状态的情况下，在第二预设时长后重新测量所述多个特定小区的信号强度和信号质量，并根据所述多个特定小区的信号质量对所述多个特定小区的信号强度进行处理，得到所述多个特定小区的目标信号强度；
    对于所述多个特定小区中任意的一个特定小区，若所述一个特定小区的目标信号强度增高且信号质量不低于信号质量阈值，则向所述第一小区发送包括有所述一个特定小区的目标信号强度的测量报告消息；若所述一个特定小区的目标信号强度不变或降低，和/或，若所述一个特定小区的信号质量低于信号质量阈值，则不向所述第一小区发送包括有所述一个特定小区的目标信号强度的测量报告消息。
  8. 如权利要求1至7任一所述的方法，其特征在于，所述方法还包括：
    若接入所述一个第二小区失败，则触发无线链路失败RLF流程；
    向目标小区发送无线资源控制RRC连接重建请求消息，所述目标小区为所述第二小区；
    接收所述目标小区发送的RRC连接重建消息，所述RRC连接重建消息携带信令无线承载SRB1配置信息；
    根据所述SRB1配置信息配置SRB1；
    向所述目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第三预设时长后未接收到所述目标小区发送的用于配置SRB2的RRC重配置消息，则通过所述SRB1进行跟踪区更新TAU。
  9. 如权利要求1至7任一所述的方法，其特征在于，所述方法还包括：
    若接入所述一个第二小区失败，则触发RLF流程；
    向第一目标小区发送RRC连接重建请求消息，所述第一目标小区为所述第二小区；
    接收所述第一目标小区发送的RRC连接重建消息；
    向所述第一目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第四预设时长后未接收到所述第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程，所述第二目标小区为所述第二小区。
  10. 一种小区接入方法，其特征在于，应用于电子设备，所述方法包括：
    接收第一小区发送的测量配置消息，所述测量配置消息用于指示测量异系统邻区信号强度；
    测量第二小区的信号强度和信号质量，所述第二小区为所述第一小区的异系统邻区；
    若所述第二小区的信号质量低于信号质量阈值，则不向所述第一小区发送测量报告消 息；
    若接收到所述第一小区发送的重定向消息，则接入一个第二小区。
  11. 如权利要求10所述的方法，其特征在于，所述接入一个第二小区，包括：
    接入信号强度高于信号强度阈值且信号质量不低于信号质量阈值的一个第二小区；或者，
    接入属于预设小区类型的一个第二小区。
  12. 如权利要求10或11所述的方法，其特征在于，所述测量第二小区的信号强度和信号质量之后，还包括：
    若所述第二小区的信号强度高于信号强度阈值且所述第二小区的信号质量不低于信号质量阈值，则向所述第一小区发送测量报告消息，所述测量报告消息包括所述第二小区的信号强度。
  13. 如权利要求10至12任一所述的方法，其特征在于，所述方法还包括：
    若接入所述一个第二小区失败，则触发RLF流程；
    向目标小区发送RRC连接重建请求消息，所述目标小区为所述第二小区；
    接收所述目标小区发送的RRC连接重建消息，所述RRC连接重建消息携带SRB1配置信息；
    根据所述SRB1配置信息配置SRB1；
    向所述目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第三预设时长后未接收到所述目标小区发送的用于配置SRB2的RRC重配置消息，则通过所述SRB1进行TAU。
  14. 如权利要求10至12任一所述的方法，其特征在于，所述方法还包括：
    若接入所述一个第二小区失败，则触发RLF流程；
    向第一目标小区发送RRC连接重建请求消息，所述第一目标小区为所述第二小区；
    接收所述第一目标小区发送的RRC连接重建消息；
    向所述第一目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第四预设时长后未接收到所述第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程，所述第二目标小区为所述第二小区。
  15. 一种小区接入方法，其特征在于，应用于电子设备，所述方法包括：
    接收第一小区发送的测量配置消息，所述测量配置消息用于指示测量异系统邻区信号强度；
    测量第二小区的信号强度，所述第二小区为所述第一小区的异系统邻区；
    若测量的所述第二小区中存在信号强度高于信号强度阈值且信号强度之差小于预设差值的多个特定小区，且若所述电子设备处于预设移动状态，则在第二预设时长后重新测量所述多个特定小区的信号强度；
    在重新测量所述多个特定小区的信号强度后，向所述第一小区发送测量报告消息，所述测量报告消息包括所述多个特定小区中信号强度增高的特定小区的信号强度；
    若接收到所述第一小区发送的切换命令，则接入所述切换命令所指示的一个第二小区。
  16. 如权利要求15所述的方法，其特征在于，所述测量第二小区的信号强度，包括：
    测量所述第二小区的信号强度和信号质量；
    所述向所述第一小区发送测量报告消息，包括：
    对于所述多个特定小区中任意的一个特定小区，若所述一个特定小区的信号强度增高且所述一个特定小区的信号质量不低于信号质量阈值，则向所述第一小区发送包括有所述一个特定小区的信号强度的测量报告消息；
    所述方法还包括：
    若所述一个特定小区的信号强度不变或降低，和/或，若所述一个特定小区的信号质量低于信号质量阈值，则不向所述第一小区发送包括有所述一个特定小区的信号强度的测量报告消息。
  17. 如权利要求15或16所述的方法，其特征在于，所述方法还包括：
    若接入所述一个第二小区失败，则触发RLF流程；
    向目标小区发送RRC连接重建请求消息，所述目标小区为所述第二小区；
    接收所述目标小区发送的RRC连接重建消息，所述RRC连接重建消息携带SRB1配置信息；
    根据所述SRB1配置信息配置SRB1；
    向所述目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第三预设时长后未接收到所述目标小区发送的用于配置SRB2的RRC重配置消息，则通过所述SRB1进行TAU。
  18. 如权利要求15或16所述的方法，其特征在于，所述方法还包括：
    若接入所述一个第二小区失败，则触发RLF流程；
    向第一目标小区发送RRC连接重建请求消息，所述第一目标小区为所述第二小区；
    接收所述第一目标小区发送的RRC连接重建消息；
    向所述第一目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第四预设时长后未接收到所述第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程，所述第二目标小区为所述第二小区。
  19. 一种小区接入方法，其特征在于，应用于电子设备，所述方法包括：
    若触发RLF流程，则向目标小区发送RRC连接重建请求消息；
    接收所述目标小区发送的RRC连接重建消息，所述RRC连接重建消息携带SRB1配置信息；
    根据所述SRB1配置信息配置SRB1；
    向所述目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第三预设时长后未接收到所述目标小区发送的用于配置SRB2的RRC重配置消息，则通过所述SRB1进行TAU。
  20. 如权利要求19所述的方法，其特征在于，所述向所述目标小区发送RRC连接重建完成消息之后，还包括：
    若在发送所述RRC连接重建完成消息的第三预设时长内接收到所述目标小区发送的所述RRC重配置消息，则根据所述RRC重配置消息中的SRB2配置信息配置SRB2；
    通过所述SRB2进行TAU。
  21. 如权利要求19或20所述的方法，其特征在于，所述若触发RLF流程，则向目标小区发送RRC连接重建请求消息之前，还包括：
    接收第一小区发送的切换命令，所述切换命令用于指示切换至一个第二小区；
    接入所述一个第二小区；
    若接入所述一个第二小区失败，则触发RLF流程。
  22. 一种小区接入方法，其特征在于，应用于电子设备，所述方法包括：
    若触发RLF流程，则向第一目标小区发送RRC连接重建请求消息；
    接收所述第一目标小区发送的RRC连接重建消息；
    向所述第一目标小区发送RRC连接重建完成消息；
    若在发送所述RRC连接重建完成消息的第四预设时长后未接收到所述第一目标小区发送的用于配置SRB2的RRC重配置消息，则触发RLF流程，与第二目标小区进行RRC连接重建流程。
  23. 如权利要求22所述的方法，其特征在于，所述向所述第一目标小区发送RRC连接重建完成消息之后，还包括：
    若在发送所述RRC连接重建完成消息的第四预设时长后接收到所述第一目标小区发送的所述RRC重配置消息，则进行TAU。
  24. 如权利要求22或23所述的方法，其特征在于，所述若触发RLF流程，则向第一目标小区发送RRC连接重建请求消息之前，还包括：
    接收第一小区发送的切换命令，所述切换命令用于指示切换至一个第二小区；
    接入所述一个第二小区；
    若接入所述一个第二小区失败，则触发RLF流程。
  25. 一种电子设备，其特征在于，所述电子设备包括存储器、处理器以及存储在所述存储器中并可在所述处理器上运行的计算机程序，所述计算机程序被所述处理器执行时实现如权利要求1至24任意一项所述的方法。
  26. 一种芯片系统，其特征在于，所述芯片系统应用于电子设备，所述芯片系统包括一个或多个处理器，所述处理器用于调用计算机指令以使得所述电子设备执行如权利要求1至24任意一项所述的方法。
PCT/CN2024/110247 2023-12-15 2024-08-07 小区接入方法、电子设备和芯片系统 Pending WO2025123716A1 (zh)

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