Cell access method and device, terminal and storage medium

Abstract

The invention provides a cell access method and device, a terminal and a storage medium, and belongs to the technical field of communication. The method comprises the following steps: sending a first access request to target network equipment; recording first signal information of the first cell as second signal information under the condition that access to the first cell fails and the cumulative number of failures of the terminal for accessing the plurality of cells is smaller than a number threshold, the first signal information being used for indicating the signal strength of the first cell; determining a target cell from a plurality of cells associated with the target frequency point, the target cell being a cell with the maximum signal strength indicated by the signal information currently recorded by the terminal in the plurality of cells; and sending a second access request to the target network device. According to the scheme, the situation that the voice bearer cannot be established due to the fact that the terminal always fails to access the first cell in the EPSFB call process can be avoided, and the call success rate of the EPSFB is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a cell access method, device, terminal and storage medium. Background Art

[0002] EPSFB (Evolved Packet System Fallback) means that when a terminal initiates or receives a voice call in a 5G (5th Generation Mobile Communication Technology) network that does not support VoNR (Voice over New Radio), the terminal will fall back from the 5G network to the LTE (Long Term Evolution) network through redirection or switching, and then VoLTE (Voice over Long Term Evolution) will provide voice services. When the voice call ends, the terminal returns to the 5G network. Therefore, how the terminal establishes VoLTE services for voice calls after falling back to the LTE network is a technical problem that needs to be solved.

[0003] In the related technology, during an EPSFB call, the terminal can be redirected to the LTE network through the RRC Release (Radio Resource Control Release) message sent by the base station. Then the terminal needs to send a TAU (Tracking Area Update) request to the base station according to the LTE frequency to establish an RRC connection. When the RRC connection is successfully established, it indicates that the terminal has successfully accessed the LTE cell corresponding to the LTE frequency. At this time, the terminal can establish a VoLTE service through the accessed LTE cell, and then make a voice call through the VoLTE service. Among them, the LTE cell refers to the wireless area controlled by the base station.

[0004] However, in the above solution, when the terminal requests to access the LTE cell, if the signal of the LTE cell is poor or the interference is strong, the TAU request sent by the terminal will not be sent to the base station, so that the voice bearer cannot be established, resulting in the user being unable to make voice calls normally. Summary of the invention

[0005] The embodiment of the present application provides a cell access method, device, terminal and storage medium, which can avoid the situation that the terminal fails to access the first cell during the EPSFB call, resulting in the inability to establish the voice bearer, thereby improving the call success rate of EPSFB. The technical solution is as follows:

[0006] According to one aspect of an embodiment of the present application, a cell access method is provided, the method comprising:

[0007] Sending a first access request to a target network device, where the target network device is a base station, the first access request is used to request access to a first cell covered by the target network device, where the first cell is a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point is a frequency point associated with the first cell;

[0008] In a case where access to the first cell fails and a cumulative number of failures of the terminal to access the multiple cells is less than a number threshold, recording first signal information of the first cell as second signal information, the first signal information being used to indicate a signal strength of the first cell, and the signal strength indicated by the second signal information being less than the signal strength indicated by the first signal information;

[0009] Determine a target cell from a plurality of cells associated with the target frequency point, the target cell being a cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the plurality of cells;

[0010] A second access request is sent to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

[0011] According to another aspect of an embodiment of the present application, a cell access device is provided, the device comprising:

[0012] A first sending module, configured to send a first access request to a target network device, where the target network device is a base station corresponding to the long term evolution technology, where the first access request is used to request access to a first cell covered by the target network device, where the first cell is a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point is a frequency point associated with the first cell;

[0013] a signal processing module, configured to, when access to the first cell fails and the cumulative number of failures of the terminal to access the multiple cells is less than a number threshold, record the first signal information of the first cell as second signal information, the first signal information being used to indicate a signal strength of the first cell, and the signal strength indicated by the second signal information being less than the signal strength indicated by the first signal information;

[0014] A determination module, configured to determine a target cell from a plurality of cells associated with the target frequency point, wherein the target cell is a cell having the largest signal strength indicated by the signal information currently recorded by the terminal among the plurality of cells;

[0015] The second sending module is used to send a second access request to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

[0016] In some embodiments, the signal processing module includes:

[0017] A first determining unit is configured to detect a process in which the terminal sends an access request to the target network device in case of failure to access the first cell, and determine a cumulative number of failures of the terminal to access the multiple cells, wherein the access request is used to request access to any one of the multiple cells;

[0018] The signal processing unit is used to punish the first signal information of the first cell based on a penalty value when the cumulative number of failures is less than the number threshold, so as to obtain the second signal information.

[0019] In some embodiments, the first determination unit is further used to determine a second cell from multiple cells associated with the target frequency point, where the second cell is the cell with the smallest signal strength among the multiple cells; based on the signal information of the second cell and the first signal information of the first cell, determine the penalty value, and the penalty value is positively correlated with the difference between the first signal information and the signal information.

[0020] In some embodiments, the determining module includes:

[0021] A sorting unit, configured to sort the multiple cells from large to small based on the current signal information of the multiple cells currently recorded by the terminal;

[0022] The second determining unit is configured to determine the target cell from the multiple cells based on a result of the sorting.

[0023] In some embodiments, the apparatus further comprises:

[0024] A starting module, configured to start a timer in response to the first access request being sent completely;

[0025] a marking module, configured to mark the first cell as an abnormal cell if the terminal does not receive the confirmation information sent by the target network device within the timing duration of the timer, wherein the confirmation information is used to indicate that the target network device has successfully received the first access request, and the abnormal cell is a cell to which the terminal fails to access;

[0026] The determination module is used to prohibit selection of the first cell for access in response to the first cell being the abnormal cell; determine the target cell from multiple cells associated with the target frequency point other than the first cell, and the target cell is the cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the multiple cells other than the first cell.

[0027] In some embodiments, the determination module is used to reduce the access priority of the first cell to the lowest in response to the first cell being the abnormal cell, the access priority of the first cell being used to indicate the order in which the terminal selects the first cell for access from the multiple cells; and determine the target cell from the multiple cells, the target cell being the cell with the largest signal strength and the highest access priority indicated by the signal information currently recorded by the terminal among the multiple cells.

[0028] In some embodiments, the marking module is used to add the physical cell identifier of the first cell to a blacklist when the terminal does not receive the confirmation information sent by the target network device within the timing time. The blacklist is used to store the physical cell identifiers of the cells to which the terminal fails to access; in response to the blacklist storing the physical cell identifier of the first cell, the first cell is marked as the abnormal cell.

[0029] In some embodiments, the marking module is further configured to clear the physical cell identifier stored in the blacklist when access to the target cell is successful.

[0030] In some embodiments, the apparatus further comprises:

[0031] A third sending module is used to send a voice bearer establishment request to the target network device through a radio resource control RRC connection between the terminal and the wireless network of the target cell when access to the target cell is successful, wherein the voice bearer establishment request is used to request the target network device to allocate a long-term evolution voice bearer to the terminal;

[0032] A receiving module, configured to receive the voice bearer allocated by the target network device;

[0033] The call module is used to make a voice call through the voice bearer.

[0034] According to another aspect of an embodiment of the present application, a terminal is provided, comprising a processor and a memory; the memory stores at least one program code, and the at least one program code is used to be executed by the processor to implement the cell access method as described in the above aspects.

[0035] According to another aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or program instructions. When the chip runs on a terminal, it is used to implement the cell access method described in the above aspects.

[0036] According to another aspect of an embodiment of the present application, a computer-readable storage medium is provided, wherein the storage medium stores at least one program code, and the at least one program code is used to be executed by a processor to implement the cell access method as described in the above aspects.

[0037] According to another aspect of an embodiment of the present application, a computer program product is provided. The computer program product stores at least one program code, and the at least one program code is used to be executed by a processor to implement the cell access method described in the above aspect.

[0038] The embodiment of the present application provides a cell access method, in which the terminal detects the access status of the first cell requested for access, and can punish the first signal information of the first cell when the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, thereby reducing the signal strength indicated by the signal information of the first cell currently recorded by the terminal. Then, by selecting the cell with the largest signal strength indicated by the currently recorded signal information from the multiple cells associated with the frequency point associated with the first cell as the cell to be accessed by the terminal again, it is avoided that during the EPSFB call, the terminal always fails to access the first cell, resulting in the inability to establish the voice bearer, thereby improving the call success rate of EPSFB and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0040] Figure 1 It is a schematic diagram of an implementation environment of a cell access method provided in an embodiment of the present application;

[0041] Figure 2 is a flow chart of a cell access method provided by an embodiment of the present application;

[0042] Figure 3 is a flow chart of another cell access method provided by an embodiment of the present application;

[0043] Figure 4 It is a schematic diagram of an abnormal cell penalty process provided by an embodiment of the present application;

[0044] Figure 5 is a schematic diagram of a cell access process provided by an embodiment of the present application;

[0045] Figure 6 This is a EPS Fallback normal call establishment flow chart provided by an embodiment of the present application;

[0046] Figure 7 It is a schematic diagram of a call signaling process of an EPSFB voice call provided in an embodiment of the present application;

[0047] Figure 8 It is a schematic diagram of another call signaling process of EPSFB voice call provided in an embodiment of the present application;

[0048] Fig. 9 This is a schematic diagram of a terminal failing to access a cell provided by an embodiment of the present application;

[0049] Fig.10 It is a structural diagram of a cell access device provided in an embodiment of the present application;

[0050] Fig.11 is a structural diagram of another cell access device provided in an embodiment of the present application;

[0051] Fig.12 It is a structural block diagram of a terminal provided in an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0053] In this article, "at least one" means one or more, and "plurality" means two or more. "And / or" describes the association relationship of the associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0054] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.) and signals involved in this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions. For example, the first signal information and target frequency points involved in this application are obtained with full authorization.

[0055] Figure 1Schematic diagram of an implementation environment of a cell access method provided in an embodiment of the present application. Figure 1 The implementation environment includes a terminal 101 and a network device 102. The terminal 101 can be directly or indirectly connected to the network device 102 through wired or wireless communication, and this application does not limit this.

[0056] In some embodiments, the terminal 101 is a terminal 101 with wireless communication function. Among them, the terminal 101 can communicate with one or more core networks via a radio access network (Radio Access Network, RAN). The terminal 101 can be a mobile terminal, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal. For example, it can be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device. The terminal 101 can be a mobile phone, a tablet computer, a computer with wireless communication function or a wearable device, etc. In the embodiments of the present application, this is not specifically limited.

[0057] In some embodiments, the network device 102 is a base station corresponding to at least one of the communication systems in the Long Term Evolution (LTE) system, the Wideband Code Division Multiple Access (WCDMA) system, or the Global System for Mobile Communications (GSM). In the embodiments of the present application, this is not specifically limited. In some embodiments, the network device 102 is any network device 102 with wireless transceiver functions. For example, the network device 102 is an access point (AP), a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and reception point (TRP) in an evolved Node B (eNB), a next generation Node B (gNB), a Wireless Fidelity (WIFI) system, etc.

[0058] In the embodiment of the present application, the terminal 101 is located within the coverage of the network device 102. Whether the terminal 101 is stationary or mobile, the terminal 101 can perform data transmission with the network device 102. The network device 102 can send data to the terminal 101, and accordingly, the terminal 101 receives the data sent by the network device 102. Alternatively, the terminal 101 sends data to the network device 102, and accordingly, the network device 102 receives the data sent by the terminal 101. Among them, the network device 102 sends data to the terminal 101 for downlink transmission, and the terminal 101 sends data to the network device 102 for uplink transmission.

[0059] Figure 2 is a flowchart of a cell access method provided in an embodiment of the present application. The method is executed by a terminal, see Figure 2 , the method comprising:

[0060] 201. A terminal sends a first access request to a target network device, where the target network device is a base station. The first access request is used to request access to a first cell covered by the target network device, where the first cell is a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point is a frequency point associated with the first cell.

[0061] In an embodiment of the present application, the target network device is a communication device for the terminal to access the Internet, covering multiple cells, each of which is used to indicate a wireless area. The terminal can access the wireless network by accessing any cell covered by the target network device. When the terminal makes an EPSFB voice call, the target network device sends an RRC Release message to the terminal. The RRC Release message is used to instruct the terminal to release the RRC connection previously established in the current network, and to instruct the terminal to redirect to the target frequency in the target network. The terminal can access the first cell associated with the target frequency in the target network by sending a first access request to the target network device. Among them, the target frequency is associated with multiple cells, and the first cell is the cell with the largest signal strength among the multiple cells. Taking the current network as a 5G network as an example, the target network is an LTE network and the target frequency is an LTE frequency.

[0062] 202. When access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than a threshold number, the terminal records the first signal information of the first cell as the second signal information, where the first signal information is used to indicate the signal strength of the first cell, and the signal strength indicated by the second signal information is less than the signal strength indicated by the first signal information.

[0063] In an embodiment of the present application, after the terminal has sent the first access request, if the terminal has not received the response information to the first access request returned by the target network device, it means that the first access request has not been successfully sent to the target network device, that is, the terminal has failed to access the first cell. In the case where the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, it indicates that the terminal can continue to access a cell associated with the target frequency point after the failure to access the first cell. The terminal reduces the signal strength indicated by the currently recorded signal information of the first cell by recording the first signal information of the first cell as the second signal information, thereby avoiding the terminal from requesting to access the first cell again. However, in the case where the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is not less than the number threshold, it indicates that the terminal's access to the first cell is the last access opportunity during this EPSFB voice call. Therefore, after the access to the first cell fails, the terminal will stop sending access requests to the target network device, and this EPSFB voice call fails.

[0064] In some embodiments, the signal information of the cell can be represented by one of RSRP (Reference Signal Receiving Power), RSSI (Received Signal Strength Indicator), and RSRQ (Reference Signal Receiving Quality), or the signal information of the cell can be determined by comprehensively considering RSRP, RSSI and RSRQ.

[0065] 203. The terminal determines a target cell from multiple cells associated with the target frequency point, where the target cell is a cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the multiple cells.

[0066] In the embodiment of the present application, after reducing the signal strength indicated by the signal information of the first cell to which access failed, the terminal can determine the current signal strengths of multiple cells according to the signal information of multiple cells associated with the currently recorded target frequency point, and then select the cell with the largest signal strength from the multiple cells as the target cell.

[0067] 204. The terminal sends a second access request to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

[0068] In the embodiment of the present application, in order to access the cell associated with the target frequency point again, the terminal can send an access request to the target network device, that is, send a second access request for requesting access to the target cell with the largest signal strength indicated by the currently recorded signal information. If the target cell is successfully accessed, it indicates that the terminal has successfully accessed the wireless network, and the terminal does not need to send an access request to the target network device again.

[0069] The embodiment of the present application provides a cell access method, in which the terminal detects the access status of the first cell requested for access, and can punish the first signal information of the first cell when the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, thereby reducing the signal strength indicated by the signal information of the first cell currently recorded by the terminal. Then, by selecting the cell with the largest signal strength indicated by the currently recorded signal information from multiple cells associated with the LTE frequency point associated with the first cell as the cell to be accessed by the terminal again, it is avoided that during the EPSFB call, the terminal always fails to access the first cell, resulting in the inability to establish the voice bearer, thereby improving the call success rate of EPSFB and improving the user experience.

[0070] Figure 3 is a flowchart of another cell access method provided in an embodiment of the present application. The method is executed by a terminal, see Figure 3 , the method comprising:

[0071] 301. A terminal sends a first access request to a target network device, where the target network device is a base station. The first access request is used to request access to a first cell covered by the target network device, where the first cell is a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point is a frequency point associated with the first cell.

[0072] In an embodiment of the present application, the target network device is a communication device for the terminal to access the Internet, covering multiple cells, each of which is used to indicate a wireless area. The terminal can access the wireless network by accessing any cell covered by the target network device. When the terminal makes an EPSFB voice call, the target network device sends an RRC Release message to the terminal, which is used to instruct the terminal to release the RRC connection previously established in the current network and instruct the terminal to redirect to the target frequency in the target network. The terminal can access the first cell associated with the target frequency in the target network by sending a first access request to the target network device. Among them, the target frequency is associated with multiple cells, and the first cell is the cell with the largest signal strength among the multiple cells. Taking the current network as a 5G network as an example, the target network is an LTE network and the target frequency is an LTE frequency.

[0073] 302. In response to the first access request being sent, the terminal starts a timer.

[0074] In the embodiment of the present application, when the first access request is sent, the terminal can start a timer to count the time the terminal waits for the target network device to respond to the first access request. Optionally, the timer is a T300 timer, and the default timing duration is 600 milliseconds. In the embodiment of the present application, the timing duration of T300 can be set to 100 milliseconds.

[0075] 303. If the terminal does not receive confirmation information sent by the target network device within the timing duration of the timer, the terminal marks the first cell as an abnormal cell. The confirmation information is used to indicate that the target network device successfully receives the first access request. The abnormal cell is a cell to which the terminal fails to access.

[0076] In the embodiment of the present application, the confirmation information is used to indicate that the target network device has successfully received the first access request. If the terminal does not receive the confirmation information sent by the target network device within the timing duration of the timer, it indicates that the target network device has not received the first access request, so the target network device cannot respond to the first access request and send the confirmation information to the terminal. At this time, the terminal can mark the first cell requested by the first access request as an abnormal cell, indicating that the first cell access failed.

[0077] In some embodiments, the terminal marks the cell as an abnormal cell by adding the physical cell identifier (PCI, Physical Cell Identifier) ​​of the cell to a blacklist. Accordingly, if the terminal does not receive the confirmation information sent by the target network device within the timing time, the terminal adds the physical cell identifier of the first cell to the blacklist, and the blacklist is used to store the physical cell identifier of the cell to which the terminal fails to access; in response to the blacklist storing the physical cell identifier of the first cell, the terminal marks the first cell as an abnormal cell. Among them, the terminal can distinguish the wireless signals of different cells in the network according to the physical cell identifier of the cell. The physical cell identifiers of multiple cells associated with the target frequency point are different. Therefore, after the first access request is sent, if the terminal does not receive the confirmation information sent by the target network device within the timing time, the terminal can add the physical cell identifier of the first cell requested to access by the first access request to the blacklist. Since the blacklist is used to store the physical cell identifier of the cell to which the terminal fails to access, when the physical cell identifier of the first cell appears in the blacklist, the terminal marks the first cell as an abnormal cell, indicating that the first cell access fails. During this EPSFB voice call, the terminal can detect the failure of the terminal to access multiple cells by creating a blacklist for storing the physical cell identifiers of the cells that failed to access.

[0078] 304. In case of failure in accessing the first cell, the terminal detects a process of sending an access request to the target network device by the terminal to determine a cumulative number of failures of the terminal in accessing multiple cells, where the access request is used to request access to any one of the multiple cells.

[0079] In an embodiment of the present application, before successfully accessing a cell, the terminal will send access requests to the target network device multiple times until the access is successful. Therefore, before accessing the first cell, the terminal may also request access to other cells among the multiple cells associated with the target frequency point, and none of them have been successfully accessed. In the case of failure to access the first cell, the terminal can determine the cumulative number of failures of the terminal to access multiple cells by determining the total number of access requests sent to the target network device. Among them, the cumulative number of failures is equal to the total number of access requests sent by the terminal to the target network device.

[0080] 305. When the cumulative number of failures is less than the number threshold, the terminal punishes the first signal information of the first cell based on the penalty value to obtain second signal information, where the signal strength indicated by the second signal information is less than the signal strength indicated by the first signal information.

[0081] In an embodiment of the present application, when the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, it indicates that the terminal can continue to access a cell associated with the target frequency point after failing to access the first cell. The terminal records the first signal information of the first cell as the second signal information based on the penalty value. The signal strength indicated by the signal information currently recorded in the first cell can be reduced, thereby avoiding the terminal from requesting access to the first cell again. It should be noted that the terminal is in the process of punishing the first signal information of the first cell based on the penalty value. It is only on the terminal side that the signal strength indicated by the first signal information of the first cell recorded by the terminal is reduced, rather than directly reducing the actual signal strength of the first cell, so the signal strength of the first cell will not be really changed. In the case of failure to access the first cell and the cumulative number of failures of the terminal to access multiple cells is not less than the number threshold, it indicates that the terminal's access to the first cell is the last access opportunity in this EPSFB voice call process. Therefore, after the access to the first cell fails, the terminal will stop sending access requests to the target network device, and this EPSFB voice call fails.

[0082] In some embodiments, the terminal determines the penalty value based on the difference between the signal information of the second cell with the smallest signal strength and the first signal information of the first cell. Accordingly, the terminal determines the second cell from the multiple cells associated with the target frequency point, and the second cell is the cell with the smallest signal strength among the multiple cells; the terminal determines the penalty value based on the signal information of the second cell and the first signal information of the first cell, and the penalty value is positively correlated with the difference between the first signal information and the signal information. Among them, the signal strengths of the multiple cells associated with the target frequency point are different. Before the first cell is punished, the first cell is the cell with the largest signal strength. By determining the second cell with the smallest signal strength, the terminal can determine the penalty value based on the signal information of the second cell and the first signal information of the first cell. The penalty value can be equal to the difference between the first signal information and the signal information of the second cell, or it can be greater than the difference between them. Optionally, after the terminal punishes the first signal information of the first cell based on the penalty value, it can make the first cell the cell with the weakest signal strength among the multiple cells, thereby avoiding the terminal from selecting the first cell for access again.

[0083] In some embodiments, the signal information of the cell can be represented by one of RSRP (Reference Signal Receiving Power), RSSI (Received Signal Strength Indicator), and RSRQ (Reference Signal Receiving Quality), or the signal information of the cell can be determined by comprehensively considering RSRP, RSSI and RSRQ.

[0084] For example, taking the signal information as RSRP, the range of the signal information of the second cell is [-117.69, -111.81] dBm (decibel milliwatts), and the range of the first signal information of the first cell is [-114.69, -108.56] dBm. Among them, -117.69 dBm and -114.69 dBm are used to indicate the signal strength at the edge of the second cell and the first cell, respectively, and -111.81 dBm and -108.56 dBm are used to indicate the signal strength at the center of the second cell and the first cell, respectively. Based on -117.69 dBm and -114.69 dBm, the terminal can determine a penalty value of -114.69 dBm for the signal information at the edge of the first cell, and the penalty value can be -114.69-(-117.69)=3 dBm. Similarly, the penalty value of the signal information -108.56dbm at the center of the first cell may be -108.56-(-111.81)=3.25dbm.

[0085] 306. The terminal sorts the multiple cells from large to small based on the signal information of the multiple cells currently recorded.

[0086] In an embodiment of the present application, after punishing the first signal information of the first cell to which access failed, the terminal can sort the multiple cells from large to small based on the signal information of the multiple cells associated with the currently recorded target frequency point. The signal information is used to indicate the signal strength of the cell. Since the target frequency point is the frequency point associated with the first cell, the multiple cells associated with the target frequency point include the first cell.

[0087] 307. The terminal determines a target cell from the multiple cells based on the sorting result, where the target cell is a cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the multiple cells.

[0088] In the embodiment of the present application, the terminal can determine the ranking result of the signal strength indicated by the current signal information of multiple cells based on the ranking result, and select the cell with the largest signal strength from the multiple cells as the target cell.

[0089] For example, Figure 4 FIG. 1 is a schematic diagram of an abnormal cell penalty process provided by an embodiment of the present application. Figure 4 As shown, first, determine whether the terminal is in the EPSFB voice call process. If so, then determine whether the terminal has failed to access the first cell and the current cumulative number of failures is less than the number threshold. If so, based on the penalty value, the first signal information of the first cell is punished to obtain the second signal information. Among them, taking the signal information as RSRP as an example, the minimum value of the signal information of any cell is -140dbm, so the terminal can set the penalty value to 140dbm. In this way, after the penalty value is subtracted from the first signal information, the signal strength of the first cell can be reduced to the minimum. Then, based on the signal information of multiple cells associated with the currently recorded target frequency point, the terminal reorders the multiple cells, and selects the cell with the largest signal strength as the target cell for access again.

[0090] In some embodiments, when the first cell is an abnormal cell, the terminal can determine the target cell from multiple cells associated with the target frequency point through the following method 1 or method 2.

[0091] Method 1: In response to the first cell being an abnormal cell, the terminal prohibits selecting the first cell for access; the terminal determines the target cell from multiple cells associated with the target frequency point other than the first cell, and the target cell is the cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the multiple cells other than the first cell. Among them, in the case that the first cell is an abnormal cell, the terminal can avoid selecting the first cell for access again after failing to access the first cell by prohibiting the selection of the first cell. Then the terminal can select the cell with the largest signal strength from multiple cells other than the first cell as the target cell based on the signal information of the multiple cells currently recorded.

[0092] Method 2: In response to the first cell being an abnormal cell, the terminal reduces the access priority of the first cell to the lowest, and the access priority of the first cell is used to indicate the order in which the terminal selects the first cell for access from multiple cells; the terminal determines the target cell from multiple cells, and the target cell is the cell with the highest signal strength and the highest access priority indicated by the signal information currently recorded by the terminal among the multiple cells. Among them, the access priority of the cell is used to indicate the order in which the terminal selects the cell for access from multiple cells, and the higher the access priority, the higher the order in which the terminal selects the cell corresponding to the access priority for access. In the case that the first cell is an abnormal cell, the terminal can adjust the order in which the terminal selects the first cell for access to the last by reducing the access priority of the first cell to the lowest, thereby avoiding the terminal from selecting the first cell for access again. Then the terminal can select the cell with the highest access priority and the greatest signal strength as the target cell among multiple cells.

[0093] 308. The terminal sends a second access request to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

[0094] In the embodiment of the present application, in order to access the cell associated with the target frequency point again, the terminal can send an access request to the target network device, that is, send a second access request for requesting access to the target cell with the largest signal strength indicated by the currently recorded signal information. If the target cell is successfully accessed, it indicates that the terminal has successfully accessed the wireless network, and the terminal does not need to send an access request to the target network device again.

[0095] For example, Figure 5 Schematic diagram of a cell access process provided by an embodiment of the present application. Figure 5As shown, first, the terminal makes an EPSFB voice call on SA (Stand Alone, independent networking). SA is a networking type of 5G. Then when the terminal is redirected to the LTE network, the terminal can send a first access request to the target network device to request access to the first cell associated with the target LTE frequency. When the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, the terminal starts the abnormal cell penalty module and records the first signal information of the first cell as the second signal information. Then, based on the signal information of multiple cells associated with the currently recorded target LTE frequency, the multiple cells are reordered. The terminal selects the target cell with the largest signal strength indicated by the signal information from multiple cells for access again. If the access to the target cell is successful, the terminal enters the subsequent VoLTE call process, and ends the cell access process after VoLTE is successfully established.

[0096] In some embodiments, when access to the target cell is successful, the terminal clears the physical cell identifier stored in the blacklist. Among them, when the terminal successfully accesses the target cell, it indicates that the terminal does not need to send an access request to the target network device again to request access to the cell associated with the target frequency point. Since the blacklist is used to store the physical cell identifiers of the cells to which the terminal failed to access. Therefore, when access to the target cell is successful, the terminal can clear the physical cell identifier stored in the blacklist during this EPSFB voice call, so as to avoid the terminal mistaking the cell corresponding to the physical cell identifier previously stored in the blacklist as an abnormal cell with failed access when making the next EPSFB voice call, thereby causing a conflict.

[0097] In some embodiments, when the access to the target cell is successful, the terminal sends a voice bearer establishment request to the target network device through the radio resource control RRC connection between the terminal and the wireless network of the target cell, and the voice bearer establishment request is used to request the target network device to allocate a long-term evolution voice bearer to the terminal; receive the voice bearer allocated by the target network device; and make a voice call through the voice bearer. Among them, the RRC connection is used to control the communication between the terminal and the target network device in the wireless network. When the terminal successfully accesses the target cell, it indicates that the terminal successfully establishes an RRC connection with the wireless network of the target cell, that is, the terminal successfully accesses the wireless network. Through the RRC connection, the terminal can send a voice bearer establishment request to the target network device to request the target network device to allocate a long-term evolution voice bearer for the terminal's EPSFB voice call this time. After the voice bearer is successfully established, the terminal can make voice calls with other terminal users through the voice bearer.

[0098] For example, Figure 6 This is a flowchart of an EPS Fallback normal call establishment provided by an embodiment of the present application. Figure 6 As shown, the steps of establishing a normal call include: Step 1: In the scenario where the UE (User Equipment) is calling or being called, the IMS (IP Multimedia Subsystem) triggers the dedicated bearer establishment process according to the SIP (Session initialization Protocol) interaction. Step 2: 5G sends a request to establish a dedicated bearer to the NG RAN (NG Radio Access Network). Step 3: NG RAN comprehensively considers whether to allow VoNR (Voice over New Radio), factors including UE capabilities, LTE wireless conditions, and whether VoNR is enabled / supported. Step 4: If the NG RAN decides EPS Fallback, it rejects the establishment of the dedicated bearer, and 5G starts waiting for the UE to fall back to 4G. Step 5: NG RAN selects Redirect or Handover to LTE according to the terminal capabilities and deployment conditions. Step 6a: If the Redirect method is selected, the TAU process is initiated. Step 6b: If the Handover method is selected, the migration process from 5G->4G is triggered. Since SIP is a UDP (User Datagram Protocol) message, the migration process is interrupted for a long time, and the message loss is serious, which triggers SIP retransmission, etc., which will affect the call continuation. Step 7: After 5G finds that the UE has completed the fallback to 4G, it resends a dedicated bearer establishment request to the base station. Step 8: The call continues.

[0099] For example, Figure 7 FIG. 1 is a schematic diagram of a call signaling process of an EPSFB voice call provided by an embodiment of the present application. Figure 7As shown, first, the BS (Base Station) sends an MT (Mobile Terminated) invite message to the MS (Mobile Station) to request to establish a call. Among them, MT refers to the voice call initiated by other mobile terminals to the MS. After receiving the MT Invite message, the MS will send a Trying message to the BS to indicate that the request is being processed. Then, the BS sends an RRC Release message to the MS to redirect the MS to the LTE frequency in the LTE network. Based on the LTE frequency, the MS sends a TAU request to the BS to establish an RRC connection. If the RRC connection is successfully established, it indicates that the MS has successfully accessed the LTE cell corresponding to the LTE frequency. At this time, the BS can allocate a QCI (QoS Class Identifier) ​​bearer to the MS based on the RRC connection. Among them, the QCI bearer is a dedicated bearer for voice calls. In the case that the MS fails to successfully access the LTE cell corresponding to the LTE frequency, such as Figure 8 As shown, at this time, the BS does not receive the TAU request sent by the MS, that is, the TAU request fails to be sent. In the case of multiple access failures of the MS, the MS sends access failure information to the BS to inform the BS that the voice bearer required during this EPSFB voice call is not established, and the BS immediately drops the call.

[0100] For example, Fig. 9 FIG. 1 is a schematic diagram of a terminal failing to access a cell provided in an embodiment of the present application. Fig. 9 As shown in Table 1, the Physical Cell ID is the physical cell identifier of the cell associated with the frequency point Freq. In the process of the terminal sending a TAU request to the base station to request access to the cell associated with the frequency point Freq, it is found that the terminal has been unable to access the cell with the physical cell identifier of 53. As shown in Table 1, in addition to the cell with the physical cell identifier of 53, the frequency point associated with the cell is also associated with 3 cells, and their physical cell identifiers are 89, 328 and 384 respectively. And according to the RSRP, RSRQ and RSSI of each cell shown in Table 1, it can be seen that the signal strength of the cell with the physical cell identifier of 89 is slightly higher than that of the cell with the physical cell identifier of 53 as a whole. That is, when accessing the cell associated with the frequency point, except for the cell with the physical cell identifier of 53, the terminal does not consider that there are cells with higher signal strength in other cells associated with the frequency point. That is, when the first access fails, the terminal does not consider choosing to access the cell with the physical cell identifier of 89, resulting in the terminal always accessing and failing in the cell with the physical cell identifier of 53.

[0101] Table 1

[0102]

[0103] The embodiment of the present application provides a cell access method, in which the terminal detects the access status of the first cell requested for access, and can punish the first signal information of the first cell when the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, thereby reducing the signal strength indicated by the signal information of the first cell currently recorded by the terminal. Then, by selecting the cell with the largest signal strength indicated by the currently recorded signal information from multiple cells associated with the LTE frequency point associated with the first cell as the cell to be accessed by the terminal again, it is avoided that during the EPSFB call, the terminal always fails to access the first cell, resulting in the inability to establish the voice bearer, thereby improving the call success rate of EPSFB and improving the user experience.

[0104] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present application, which will not be described one by one here.

[0105] The following is an embodiment of the device of the present application, which can be used to execute the embodiment of the method of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the method of the present application.

[0106] Fig.10 is a schematic diagram of the structure of a cell access device provided in an embodiment of the present application. Fig.10 , the device comprises:

[0107] The first sending module 1001 is used to send a first access request to a target network device, where the target network device is a base station, and the first access request is used to request access to a first cell covered by the target network device, where the first cell is a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point is a frequency point associated with the first cell;

[0108] The signal processing module 1002 is configured to record the first signal information of the first cell as the second signal information when the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, the first signal information is used to indicate the signal strength of the first cell, and the signal strength indicated by the second signal information is less than the signal strength indicated by the first signal information;

[0109] The determination module 1003 is used to determine a target cell from multiple cells associated with the target frequency point, where the target cell is the cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the multiple cells;

[0110] The second sending module 1004 is used to send a second access request to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

[0111] In some embodiments, Fig.111002 is a schematic diagram of the structure of another cell access device provided in an embodiment of the present application. The signal processing module 1002 includes:

[0112] The first determining unit 1101 is configured to detect a process in which the terminal sends an access request to the target network device when access to the first cell fails, and determine a cumulative number of failures of the terminal to access multiple cells, where the access request is used to request access to any one of the multiple cells;

[0113] The signal processing unit 1102 is configured to, when the accumulated number of failures is less than a number threshold, punish the first signal information of the first cell based on a penalty value to obtain second signal information.

[0114] In some embodiments, the first determination unit 1101 is also used to determine a second cell from multiple cells associated with the target frequency point, where the second cell is the cell with the smallest signal strength among the multiple cells; based on the signal information of the second cell and the first signal information of the first cell, determine a penalty value, and the penalty value is positively correlated with the difference between the first signal information and the signal information.

[0115] In some embodiments, see Fig.11 , determining module 1003, including:

[0116] A sorting unit 1103, configured to sort the multiple cells from large to small based on the signal information of the multiple cells currently recorded by the terminal;

[0117] The second determining unit 1104 is configured to determine a target cell from the plurality of cells based on the sorting result.

[0118] In some embodiments, see Fig.11 , the device further comprises:

[0119] A starting module 1005, configured to start a timer in response to the first access request being sent completely;

[0120] The marking module 1006 is used to mark the first cell as an abnormal cell if the terminal does not receive the confirmation information sent by the target network device within the timing duration of the timer, and the confirmation information is used to indicate that the target network device successfully receives the first access request, and the abnormal cell is a cell to which the terminal fails to access;

[0121] The determination module 1003 is used to prohibit the selection of the first cell for access in response to the first cell being an abnormal cell; determine the target cell from multiple cells associated with the target frequency point other than the first cell, where the target cell is the cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the multiple cells other than the first cell.

[0122] In some embodiments, the determination module 1003 is used to reduce the access priority of the first cell to the lowest in response to the first cell being an abnormal cell, and the access priority of the first cell is used to indicate the order in which the terminal selects the first cell for access from multiple cells; from the multiple cells, determine the target cell, and the target cell is the cell with the largest signal strength and the highest access priority indicated by the signal information currently recorded by the terminal among the multiple cells.

[0123] In some embodiments, see Fig.11 , a marking module 1006 is used to add the physical cell identifier of the first cell to a blacklist when the terminal does not receive confirmation information sent by the target network device within a timing period, and the blacklist is used to store the physical cell identifiers of the cells to which the terminal fails to access; in response to the physical cell identifier of the first cell being stored in the blacklist, the first cell is marked as an abnormal cell.

[0124] In some embodiments, the marking module 1006 is further configured to clear the physical cell identifier stored in the blacklist when access to the target cell is successful.

[0125] In some embodiments, see Fig.11 , the device further comprises:

[0126] The third sending module 1007 is used to send a voice bearer establishment request to the target network device through the radio resource control RRC connection between the terminal and the wireless network of the target cell when the access to the target cell is successful, and the voice bearer establishment request is used to request the target network device to allocate a long-term evolution voice bearer Vo to the terminal;

[0127] The receiving module 1008 is used to receive the voice bearer allocated by the target network device;

[0128] The call module 1009 is used to make a voice call through the voice bearer.

[0129] The embodiment of the present application provides a cell access device, in which the terminal detects the access status of the first cell requested for access, and can punish the first signal information of the first cell when the access to the first cell fails and the cumulative number of failures of the terminal to access multiple cells is less than the number threshold, thereby reducing the signal strength indicated by the signal information of the first cell currently recorded by the terminal. Then, by selecting the cell with the largest signal strength indicated by the currently recorded signal information from multiple cells associated with the frequency point associated with the first cell as the cell to be accessed by the terminal again, it is avoided that during the EPSFB call, the terminal always fails to access the first cell, resulting in the inability to establish the voice bearer, thereby improving the call success rate of EPSFB and improving the user experience.

[0130] It should be noted that the device provided in the above embodiment, when implementing its functions, only uses the division of the above functional modules as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the server is divided into different functional modules to complete all or part of the functions described above. In addition, the device and method embodiments provided in the above embodiment belong to the same concept, and their specific implementation process is detailed in the method embodiment, which will not be repeated here.

[0131] An embodiment of the present application provides a terminal, which includes a processor and a memory; the memory stores at least one program code, and the at least one program code is used to be executed by the processor to implement the cell access method provided by the above-mentioned various method embodiments.

[0132] Fig.12 1 is a block diagram of a terminal 1200 provided according to an embodiment of the present application. In some embodiments, the terminal 1200 is a smart phone, a tablet computer, a computer with wireless communication function, or a wearable device. The terminal 1200 in the present application includes at least one or more of the following components: a processor 1210, a memory 1220, and a transceiver 1230.

[0133] In some embodiments, the processor 1210 includes one or more processing cores. The processor 1210 uses various interfaces and lines to connect various parts of the entire terminal 1200, and executes various functions and processes data of the terminal 1200 by running or executing program codes stored in the memory 1220, and calling data stored in the memory 1220. In some embodiments, the processor 1210 is implemented in at least one hardware form of digital signal processing (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 1210 can integrate one or a combination of a central processing unit (CPU), a graphics processing unit (GPU), a neural network processor (NPU), and a modem. Among them, the CPU mainly processes the operating system, user interface, and application programs; the GPU is responsible for rendering and drawing the content to be displayed on the display screen; the NPU is used to implement artificial intelligence (AI) functions; and the modem is used to process wireless communications. It is understandable that the above-mentioned modem may not be integrated into the processor 1210, but may be implemented by a separate chip.

[0134] In some embodiments, the processor 1210 is a processor integrated with a wireless fidelity (Wireless Fidelity, Wi-Fi) chip. The Wi-Fi chip is a chip with dual Wi-Fi processing capabilities. For example, the Wi-Fi chip is a dual-band dual concurrent (DBDC) chip, or a dual-band simultaneous (DBS) chip.

[0135] In some embodiments, the memory 1220 includes a random access memory (RAM), and in some embodiments, the memory 1220 includes a read-only memory (ROM). In some embodiments, the memory 1220 includes a non-transitory computer-readable storage medium. The memory 1220 can be used to store program codes. The memory 1220 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playback function, an image playback function, etc.), instructions for implementing the following various method embodiments, etc.; the data storage area may store data created according to the use of the terminal 1200 (such as audio data, a phone book), etc.

[0136] In some embodiments, the transceiver 1230 is a fiber optic transceiver. A fiber optic transceiver is an Ethernet transmission media conversion unit that interchanges short-distance twisted pair electrical signals with long-distance optical signals. The transceiver 1230 is used to convert the electrical signals of the terminal 1200 into optical signals and send them out, and can also convert the received optical signals into electrical signals and input them into the terminal 1200.

[0137] In some embodiments, the terminal 1200 also includes a display screen. The display screen is a display component for displaying a user interface. In some embodiments, the display screen is a display screen with a touch function, through which the user can use any suitable object such as a finger or a touch pen to perform touch operations on the display screen. In some embodiments, the display screen is usually arranged on the front panel of the terminal 1200. In some embodiments, the display screen is designed to be a full screen, a curved screen, a special-shaped screen, a double-sided screen or a folding screen. In some embodiments, the display screen is also designed to be a combination of a full screen and a curved screen, a combination of a special-shaped screen and a curved screen, etc., which is not limited in this embodiment.

[0138] In addition, those skilled in the art will appreciate that the structure of the terminal 1200 shown in the above drawings does not limit the terminal 1200, and the terminal 1200 includes more or fewer components than shown in the drawings, or combines certain components, or arranges components differently. For example, the terminal 1200 also includes components such as a microphone, a speaker, an input unit, a sensor, an audio circuit, a module, a power supply, and a Bluetooth module, which will not be described in detail here.

[0139] The present application also provides a computer-readable storage medium, which stores at least one program code, and the at least one program code is loaded and executed by the processor to implement the cell access method shown in the above embodiments.

[0140] The present application also provides a chip, which includes a programmable logic circuit and / or program instructions. When the chip runs on a terminal, it is used to implement the cell access method shown in the above embodiments.

[0141] The present application also provides a computer program product, which stores at least one program code, and the at least one program code is used to be executed by a processor to implement the cell access method shown in the above embodiments.

[0142] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0143] Those skilled in the art can understand that all or part of the steps in the cell access method of the above embodiment can be completed by hardware, or can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium, and the storage medium mentioned above can be a read-only memory, a disk or an optical disk, etc. The above is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A cell access method, It is characterized in that Applied to a terminal, the method comprises: Sending a first access request to a target network device, where the target network device is a base station, the first access request is used to request access to a first cell covered by the target network device, where the first cell is a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point is a frequency point associated with the first cell; In a case where access to the first cell fails and a cumulative number of failures of the terminal to access the multiple cells is less than a number threshold, recording first signal information of the first cell as second signal information, the first signal information being used to indicate a signal strength of the first cell, and the signal strength indicated by the second signal information being less than the signal strength indicated by the first signal information; Determine a target cell from a plurality of cells associated with the target frequency point, the target cell being a cell with the largest signal strength indicated by the signal information currently recorded by the terminal among the plurality of cells; A second access request is sent to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

2. The method according to claim 1, It is characterized in that The step of recording the first signal information of the first cell as the second signal information when the access to the first cell fails and the cumulative number of failures of the terminal to access the multiple cells is less than a number threshold comprises: In the case of failure in accessing the first cell, detecting a process in which the terminal sends an access request to the target network device, and determining a cumulative number of failures of the terminal to access the multiple cells, wherein the access request is used to request access to any one of the multiple cells; When the accumulated number of failures is less than the number threshold, the first signal information of the first cell is penalized based on a penalty value to obtain the second signal information.

3. The method according to claim 2, It is characterized in that The method further comprises: Determine a second cell from the multiple cells associated with the target frequency point, where the second cell is a cell with the smallest signal strength among the multiple cells; The penalty value is determined based on the signal information of the second cell and the first signal information of the first cell, and the penalty value is positively correlated with the difference between the first signal information and the signal information.

4. The method according to claim 1, It is characterized in that The determining the target cell from the multiple cells associated with the target frequency point includes: Based on the signal information of the multiple cells currently recorded by the terminal, sorting the multiple cells from large to small; Based on the sorting result, the target cell is determined from the multiple cells.

5. The method according to claim 1, It is characterized in that The method further comprises: In response to the first access request being sent, starting a timer; If the terminal does not receive confirmation information sent by the target network device within the timing duration of the timer, marking the first cell as an abnormal cell, the confirmation information is used to indicate that the target network device has successfully received the first access request, and the abnormal cell is a cell to which the terminal fails to access; The determining the target cell from the multiple cells associated with the target frequency point includes: In response to the first cell being the abnormal cell, prohibiting selection of the first cell for access; The target cell is determined from a plurality of cells associated with the target frequency point except the first cell, where the target cell is a cell having the largest signal strength indicated by the signal information currently recorded by the terminal among the plurality of cells except the first cell.

6. The method according to claim 5, It is characterized in that The determining the target cell from the multiple cells associated with the target frequency point includes: In response to the first cell being the abnormal cell, reducing the access priority of the first cell to the lowest, where the access priority of the first cell is used to indicate the order in which the terminal selects the first cell from the multiple cells for access; The target cell is determined from the multiple cells, where the target cell is a cell having the maximum signal strength and the highest access priority indicated by the signal information currently recorded by the terminal among the multiple cells.

7. The method according to claim 5, It is characterized in that When the terminal does not receive the confirmation information sent by the target network device within the timing duration of the timer, marking the first cell as an abnormal cell includes: If the terminal does not receive the confirmation information sent by the target network device within the timing time, adding the physical cell identifier of the first cell to a blacklist, where the blacklist is used to store the physical cell identifiers of the cells to which the terminal fails to access; In response to the blacklist storing the physical cell identifier of the first cell, marking the first cell as the abnormal cell.

8. The method according to claim 7, It is characterized in that The method further comprises: When access to the target cell is successful, the physical cell identifier stored in the blacklist is cleared.

9. The method according to claim 1, It is characterized in that The method further comprises: In the case of successful access to the target cell, sending a voice bearer establishment request to the target network device through a radio resource control RRC connection between the terminal and the wireless network of the target cell, wherein the voice bearer establishment request is used to request the target network device to allocate a voice bearer for the terminal; receiving the voice bearer allocated by the target network device; A voice call is conducted through the voice bearer.

10. A cell access device, It is characterized in that Applied to a terminal, the device comprises: A first sending module, configured to send a first access request to a target network device, the target network device being a base station, the first access request being used to request access to a first cell covered by the target network device, the first cell being a cell with the largest signal strength among multiple cells associated with a target frequency point, and the target frequency point being a frequency point associated with the first cell; a signal processing module, configured to, when access to the first cell fails and the cumulative number of failures of the terminal to access the multiple cells is less than a number threshold, record the first signal information of the first cell as second signal information, the first signal information being used to indicate a signal strength of the first cell, and the signal strength indicated by the second signal information being less than the signal strength indicated by the first signal information; A determination module, configured to determine a target cell from a plurality of cells associated with the target frequency point, wherein the target cell is a cell having the largest signal strength indicated by the signal information currently recorded by the terminal among the plurality of cells; The second sending module is used to send a second access request to the target network device, where the second access request is used to request access to a target cell covered by the target network device.

11. A terminal, It is characterized in that The terminal includes a processor, a memory, and a transceiver; the memory stores at least one program code, and the at least one program code is used to be executed by the processor to implement the cell access method according to any one of claims 1 to 9.

12. A computer-readable storage medium, It is characterized in that The storage medium stores at least one program code, and the at least one program code is used to be executed by a processor to implement the cell access method according to any one of claims 1 to 9.

13. A chip, It is characterized in that The chip includes a programmable logic circuit and / or program instructions, and when the chip runs on a terminal, is used to implement the cell access method according to any one of claims 1 to 9.

14. A computer program product comprising a computer program, It is characterized in that The computer program product stores at least one program code, and the at least one program code is used to be executed by a processor to implement the cell access method according to any one of claims 1 to 9.

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