Communication method, device and system

Abstract

Provided are a communication method, device and system, which belong to the technical field of communications, the method comprising: identifying a trigger instruction in a target state, the target state comprising that a UE is in a normal service state on a 5G network and only one first emergency bearer exists between the UE and a 5G network device, the trigger instruction comprising a common call instruction or an inter-system instruction; and in response to the trigger instruction, sending a first activation request to the network device, the first activation request being used for requesting to activate a first common bearer between the UE and the network device. According to the invention, when the trigger instruction is identified, the common bearer with the network equipment can be immediately and actively activated, the call service is tried to be recovered, and the overall communication performance is improved. The method is used for calling services.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a communication method, device and system. Background Art

[0002] An emergency call (EMC call) refers to a call made by a mobile communication terminal user to seek help by calling an alarm or distress number in an emergency (such as natural disasters, traffic accidents, theft, and violent attacks). The fifth generation mobile communication technology (5G) network supports the establishment of emergency bearers and implements emergency call services through emergency bearers. In the event of a network anomaly or failure in re-registration of the Internet protocol multimedia subsystem (IMS), it is necessary to release the user equipment (UE) and other ordinary bearers in the 5G network except the emergency bearer. At this time, although the UE voice service is unavailable on the 5G network, it is still in a normal service state. While the UE is in a normal service state and there is only one emergency bearer between the UE and the 5G network, the UE cannot perform ordinary call services or receive call backs (including ordinary call backs and emergency call backs).

[0003] In the related art, when the UE is in a normal service state and there is only one emergency bearer between the UE and the new radio (NR) network, the NR network will not be invalidated (disable NR). If a normal call is initiated on the NR network, the normal call fails because the voice service of the UE on the NR network is not available. The UE searches for the long-term evolution (LTE) cell. After the UE successfully searches for the LTE cell, since there is also only one emergency bearer between the UE and the LIE network, the UE will directly enter the limited service state. At this time, the UE searches for the global system for mobile communications / universal mobile telecommunications system (GSM / UMTS, referred to as GU) cell for a normal call. If a normal call is successfully initiated in the GU cell, the LTE cell is searched for resident after the normal call is hung up.

[0004] However, in the related art, during the period when the normal bearer is not successfully established, whether the normal call initiated by the UE on the NR network is successful depends on whether the search for the GU cell is successful, so the success rate is low. Even if the search for the GU cell is successful, the repeated search will cause a long delay in the entire call. In addition, the UE will search for the LTE cell when hanging up the normal call. When there is no normal call service, the UE may also switch to the LTE cell due to network reconfiguration or cell energy fluctuations. During the period of staying in the LTE cell, the UE is always in a restricted service state and cannot make normal calls or receive call backs. Therefore, the communication performance of the related art is poor. Summary of the invention

[0005] The present application provides a communication method, device and system, which solve the problems in the related art that the success rate of ordinary calls initiated by UE on the NR network is low, the call delay is long, and the UE is always in a restricted service state during the stay in the LTE cell, and cannot make ordinary calls and receive call backs. The method, device and system can immediately and actively activate the ordinary bearer between the UE and the network equipment upon receiving a trigger instruction, try to restore the call service, and improve the overall communication performance.

[0006] In a first aspect, the present application provides a communication method, the method comprising: identifying a trigger instruction in a target state, the target state comprising that the UE is in a normal service state on a fifth-generation mobile communication technology 5G network and there is only one first emergency bearer between the UE and the 5G network device, the trigger instruction comprising a normal call instruction or a different system instruction; in response to the trigger instruction, sending a first activation request to the network device, the first activation request being used to request activation of a first normal bearer between the UE and the network device.

[0007] In the related art, for the scenario where the UE is in normal service on the NR network and there is only one emergency bearer between the UE and the NR network device, the NR network is only restricted from being invalidated. After receiving the normal call instruction, the network is searched repeatedly. Whether the normal call initiated by the UE is successful depends on whether the network search of the GU cell is successful, so the success rate is low. When receiving the normal call instruction, the embodiment of the present application can immediately and actively activate the normal bearer between the 5G network device, try to restore the normal call capability under the 5G network, and then perform the normal call service. Compared with the related art, it can effectively improve the success rate of the normal call service, and compared with the repeated network search process, it can reduce the call delay.

[0008] In addition, in the related art, the UE is always in a restricted service state while staying in the LTE cell, and cannot make ordinary calls or receive callbacks. In the embodiment of the present application, after the UE switches from another system to the 4G network, it actively activates the ordinary bearer between the UE and the 4G network equipment, and attempts to restore the UE to a normal service state in the 4G network, thereby realizing ordinary calls and receiving callbacks in the 4G network. Compared with the related art, it can ensure call service continuity, improve the call completion rate, and at the same time reduce the risk of not receiving network-side callbacks, improve the overall communication performance, and reduce call latency.

[0009] In one possible implementation, the trigger instruction is a heterogeneous system instruction, and the network device is a fourth-generation mobile communication technology 4G network device; in response to the trigger instruction, the process of sending a first activation request to the network device includes: responding to the heterogeneous system instruction, heterogeneous system to 4G network; sending a second activation request to the 4G network device, the second activation request is used to request activation of a first default bearer between the UE and the 4G network device; when the first default bearer is activated successfully, sending a first activation request to the 4G network device.

[0010] The beneficial effect is that even if the subsequent normal bearer activation fails, the existence of the first default bearer will prevent the UE from entering the restricted service state.

[0011] In a possible implementation, the method further includes: when the first default bearer is activated successfully, sending a third activation request to the 4G network device, where the third activation request is used to request activation of a second emergency bearer between the UE and the 4G network device.

[0012] In a possible implementation, the trigger instruction is a normal call instruction, the network device is a 5G network device, and the method further includes: sending a normal call request to the 5G network device, where the normal call request is used to request a normal call service.

[0013] In a possible implementation manner, when the first common bearer is activated successfully, a first IMS registration message is sent to the network device, where the first IMS registration message is used for IMS registration.

[0014] In a possible implementation, the method also includes: when the first common bearer activation fails or the IMS registration fails, switching to a 4G network; sending a fourth activation request to the 4G network device, the fourth activation request being used to request activation of a second default bearer between the UE and the 4G network device; when the second default bearer activation is successful, sending a fifth activation request to the 4G network device, the fifth activation request being used to request activation of the second common bearer between the UE and the 4G network device.

[0015] In a possible implementation, the method further includes: when the second default bearer is activated successfully, sending a sixth activation request to the 4G network device, where the sixth activation request is used to request activation of a third emergency bearer between the UE and the 4G network device.

[0016] In a possible implementation, when the second common bearer is activated successfully, a second IMS registration message is sent to the 4G network device, where the second IMS registration message is used for IMS registration.

[0017] In a second aspect, the present application provides a communication device, which includes: a transceiver module for identifying a trigger instruction in a target state, the target state includes that the UE is in a normal service state on a fifth-generation mobile communication technology 5G network and there is only one first emergency bearer between the UE and the 5G network device, and the trigger instruction includes a normal call instruction or a different system instruction; a processing module for sending a first activation request to the network device in response to the trigger instruction, the first activation request being used to request activation of a first normal bearer between the UE and the network device.

[0018] In one possible implementation, the trigger instruction is an inter-system instruction, and the network device is a 4G network device; the processing module is specifically used to: respond to the inter-system instruction, inter-system to 4G network; send a second activation request to the 4G network device, the second activation request is used to request activation of the first default bearer between the UE and the 4G network device; when the first default bearer is activated successfully, send the first activation request to the 4G network device.

[0019] In a possible implementation, the transceiver module is further used to send a third activation request to the 4G network device when the first default bearer is activated successfully, and the third activation request is used to request activation of a second emergency bearer between the UE and the 4G network device.

[0020] In one possible implementation, the trigger instruction is a normal call instruction, the network device is a 5G network device, and the transceiver module is also used to send a normal call request to the 5G network device, and the normal call request is used to request a normal call service.

[0021] In a possible implementation, the transceiver module is further configured to send a first Internet Protocol Multimedia Subsystem IMS registration message to the network device when the first common bearer is successfully activated, where the first IMS registration message is used for IMS registration.

[0022] In a possible implementation, the processing module is further used to switch from the first common bearer to the 4G network when activation of the first common bearer fails or IMS registration fails; the transceiver module is further used to send a fourth activation request to the 4G network device, and the fourth activation request is used to request activation of the second default bearer between the UE and the 4G network device; the transceiver module is further used to send a fifth activation request to the 4G network device when activation of the second default bearer is successful, and the fifth activation request is used to request activation of the second common bearer between the UE and the 4G network device.

[0023] In a possible implementation, the transceiver module is further used to send a sixth activation request to the 4G network device when the second default bearer is activated successfully, and the sixth activation request is used to request activation of a third emergency bearer between the UE and the 4G network device.

[0024] In a possible implementation, the transceiver module is further configured to send a second IMS registration message to the 4G network device when the second common bearer is successfully activated, where the second IMS registration message is used for IMS registration.

[0025] In a third aspect, the present application provides a communication device, comprising: one or more processors; a memory for storing one or more computer programs or instructions; when the one or more computer programs or instructions are executed by the one or more processors, the one or more processors implement a method as described in any one of the first aspects.

[0026] In a fourth aspect, the present application provides a communication device, comprising a processor, configured to execute a method as described in any one of the first aspects.

[0027] In a fifth aspect, the present application provides a communication device, comprising: a processing circuit and an interface circuit; wherein the interface circuit is used to couple with a memory outside the communication device and provide a communication interface for the processing circuit to access the memory; the processing circuit is used to execute program instructions in the memory to implement a method as described in any one of the first aspects.

[0028] In the specific implementation process, the communication device can be a chip, the input circuit can be an input pin, the output circuit can be an output pin, and the processing circuit can be a transistor, a gate circuit, a trigger, and various logic circuits. The input signal received by the input circuit can be, for example, but not limited to, received and input by a receiver, and the signal output by the output circuit can be, for example, but not limited to, output to a transmitter and transmitted by the transmitter, and the input circuit and the output circuit can be the same circuit, which is used as an input circuit and an output circuit at different times. The embodiments of the present application do not limit the specific implementation methods of the processor and various circuits.

[0029] In one implementation, the communication device may be a wireless communication device, that is, a computer device that supports wireless communication functions. Specifically, the wireless communication device may be a terminal such as a smart phone, or a wireless access network device such as a base station. The network chip may also be referred to as a system on chip (SoC), or simply as an SoC chip. The communication chip may include a baseband processing chip and a radio frequency processing chip. The baseband processing chip is sometimes also referred to as a modem or a baseband chip. The radio frequency processing chip is sometimes also referred to as a radio frequency transceiver or a radio frequency chip. In a physical implementation, some or all of the chips in the communication chip may be integrated inside the SoC chip. For example, the baseband processing chip is integrated in the SoC chip, and the radio frequency processing chip is not integrated with the SoC chip. The interface circuit may be a radio frequency processing chip in a wireless communication device, and the processing circuit may be a baseband processing chip in a wireless communication device.

[0030] In another implementation, the communication device may be a part of a wireless communication device, such as an integrated circuit product such as a network chip or a communication chip. The interface circuit may be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or a related circuit on the chip or chip network. The processor may also be embodied as a processing circuit or a logic circuit.

[0031] In a sixth aspect, the present application provides a computer-readable storage medium, in which a program code is stored. When the program code is executed by a processor, the method as described in any one of the first aspects is implemented.

[0032] In a seventh aspect, the present application provides a chip, comprising: at least one processor. The at least one processor is configured to execute the method as described in any one of the first aspects.

[0033] Optionally, the chip further includes a memory. At least one processor is used to execute the code in the memory, and when the at least one processor executes the code, the chip implements the method as described in any one of the first aspects.

[0034] Optionally, the above chip may also be an integrated circuit.

[0035] In an eighth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to implement the method as described in any one of the first aspects.

[0036] In a ninth aspect, the present application provides a communication system, the system comprising: a UE and a network device; the UE is used to execute any method described in the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1A schematic diagram of the structure of a communication system provided in an embodiment of the present application;

[0038] Figure 2 A flow chart of a communication method provided in an embodiment of the present application;

[0039] Figure 3 A flowchart of another communication method provided in an embodiment of the present application;

[0040] Figure 4 A block diagram of a communication device provided in an embodiment of the present application;

[0041] Figure 5 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0042] Figure 6 A schematic diagram of the structure of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions in this application will be clearly and completely described below in conjunction with the drawings in this application. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0044] The terms "first", "second", etc. in the specification embodiments, claims, and drawings of the present application are only used for the purpose of distinguishing descriptions, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, including a series of steps or units. The method, system, product, or device is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products, or devices.

[0045] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0046] For communication scenarios where the network equipment supports the establishment of emergency bearers and the UE supports emergency call services, when the UE initiates an emergency call service on the data network, it is necessary to first establish an emergency bearer based on the data network identifier (data network name, DNN) of the emergency call type. The emergency bearer can also be called an emergency protocol data unit session (emergency PDU session), which serves as an emergency service connection between the user and the data network. After the emergency bearer is successfully established, the UE initiates an IMS emergency registration. After the IMS emergency registration is successful, the UE initiates an emergency call. After the emergency call is connected, the user can provide feedback for help or alarm content. Subsequent emergency call callbacks can also be transmitted through the emergency bearer. DNN can be DNN for IMS, EMC or other proprietary services, etc.

[0047] In some scenarios, the UE or data network will actively release other bearers except emergency bearers. Taking the NR network as an example, the bearer types between the UE and the data network include: emergency bearer and normal bearer. Normal bearer can also be called IMS bearer or PDU session, which is a dedicated connection established by the UE based on the DNN type of the service and the network, and is used for information exchange between the user and the data network.

[0048] Among them, the scenarios in which the NR network actively releases the ordinary bearer include but are not limited to: scenario 1, the NR network actively initiates the ordinary bearer release process in order to release ordinary bearer resources or user plane resources, and the session management function (the session management function, SMF) network element in the 5G core (5G core, 5GC) network indicates the reason for releasing the ordinary bearer through the 5GSM cause IE in the ordinary bearer release command message. If the selected service continuity mode (session and service continuity mode, SSC mode) mode of the ordinary bearer is "SSC mode 2", and the SMF network element requests to relocate the SSC mode 2 PDU session anchor of different ordinary bearers, the 5GSM cause IE includes a 5GSM cause value #39 "reactivation requested"; scenario 2, the SMF network element determines that the UE is not in the local area data network (LAND) service area through the access and mobility management function (AMF) network element, and the 5GSM cause IE includes a 5GSM cause value 46 "out of LAND server (out of LADNservice area)".

[0049] The scenarios in which the UE actively releases normal bearers in the NR network include but are not limited to: the UE performs IMS periodic registration after the periodic timing times out. If the periodic registration Timef timer times out, the UE actively releases all normal bearers and re-establishes normal bearers after a period of time.

[0050] From the above description, it can be seen that if the network is abnormal or the periodic registration Timef timer times out, the NR network or UE will release all normal bearers and only one emergency bearer will exist. At this time, you can try to establish a normal bearer again.

[0051] When trying to establish a normal bearer again, the NR network may reject the establishment of the normal bearer, resulting in a longer recovery time for the normal bearer. The scenarios in which the NR network rejects the establishment of a normal bearer include but are not limited to: Scenario 1. If the normal bearer establishment request message contains an SSC mode information element, the SSC mode information element indicates an SSC mode that is not supported by the subscription, SMF configuration, or both, and the SMF network element decides to reject the establishment of a normal bearer, then the 5GSM reason IE of the normal bearer establishment rejection message includes a 5GSM reason value #68 "not supported SSC mode"; Scenario 2. If the UE is outside the LADN service area, the UE requests the establishment of a normal bearer of the LADN, and the 5GSM reason IE of the normal bearer establishment rejection message includes a 5GSM reason value #46 "out of LADN service area"; Scenario 3. If the normal bearer cannot be established due to the unavailability of resources in the user plane function (UPF) network element, the 5GSM reason IE of the normal bearer establishment rejection message includes a 5GSM reason value #26 "insufficient resources"; Scenario 4. The 5GSM reason IE of the normal bearer establishment rejection message includes a 5GSM reason value #38 "network failure (network failure)". In scenario 5, the 5GSM cause IE of the normal bearer establishment reject message includes the 5GSM cause value #67 "Insufficient resources for specific slice and DNN".

[0052] When there is only one emergency bearer between the UE and the NR network, although the voice service on the NR network is unavailable, the UE is in normal service. When the UE is in normal service and there is only one emergency bearer between it and the NR network, the scenarios that may occur include but are not limited to: Scenario 1: For a period of time, the UE resides in the NR network. After the UE initiates a normal call request, the normal call fails because the voice service is unavailable on the NR network; Scenario 2: The UE is in a different system to the LTE network, and the original emergency bearer is mapped. Therefore, there is only one emergency bearer between the UE and the LTE network. The UE will directly enter the restricted service state on the LTE network. During the period of entering the restricted service state, it is impossible to make ordinary calls or receive callbacks for emergency calls based on the current protocol.

[0053] As can be seen from the above description, after the normal bearer between the UE and the NR network is released, the recovery time of the normal bearer may be longer. When the UE is in normal service on the NR network and there is only one emergency bearer between the UE and the NR network, normal calls and receiving emergency call callbacks will fail or be delayed for a period of time.

[0054] An embodiment of the present application provides a communication system, which may comply with the third generation partnership project (3GPP) wireless communication standard, or may comply with other wireless communication standards, such as the 802 series (such as 802.11, 802.15, or 802.20) wireless communication standards of the Institute of Electrical and Electronics Engineers (IEEE), but the embodiment of the present application does not limit this.

[0055] Among them, the communication system that complies with the 3GPP wireless communication standard may include: the fourth generation mobile communication technology (4G) system and the 5G system, the future evolution network or multiple communication convergence systems, etc. Among them, the 4G system may include the LTE system and the cloud radio access network (CRAN) system. The 5G system may include the new radio (NR) system and the evolved public land mobile network (PLMN) system.

[0056] The communication system may include UE and network equipment. The network equipment includes but is not limited to: access network equipment, bearer network equipment, such as radio bearer (RB) network equipment, core network equipment or local area network (such as terminal network and server network) equipment, etc.

[0057] Access network equipment may include: base station, evolved NodeB (eNodeB), transmission reception point (TRP), next generation NodeB (gNB) in 5G system, access network equipment in open radio access network (O-RAN), next generation base station in 4G system, base station in future mobile communication system and access node in wireless fidelity (WiFi) system, etc.

[0058] The access network device may also be a module or unit that completes some functions of the base station, for example, it may be a centralized unit (CU), a distributed unit (DU), a centralized unit control plane (CU control plane, CU-CP) module or a centralized unit user plane (CU user plane, CU-UP) module. The access network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the access network device.

[0059] The bearer network equipment may include optical fiber equipment, such as packet transport network (PTN) equipment or optical transport network (OTN) equipment.

[0060] For core network equipment, taking the LTE system as an example, the core network equipment may include: mobility management entity (MME), serving gateway (S-GW) or public data network gateway (P-GW), etc. Taking the 5G system as an example, the core network equipment may be AMF equipment, SMF equipment, UPF equipment, unified data management (UDM) equipment, authentication server function (AUSF) equipment or policy control function (PCF) equipment, etc.

[0061] UE may include: access terminal, terminal unit, terminal station, mobile station, mobile station, remote station, remote terminal, mobile device, wireless communication device, terminal agent and terminal device, etc. Access terminal may include: cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), handheld device with wireless communication function (such as mobile phone, foldable electronic device, handheld computer and tablet computer), computing device (such as desktop computer, laptop computer, notebook computer, super mobile personal computer and netbook), other processing devices connected to wireless modem, vehicle-mounted equipment, wearable device, drone, helicopter, airplane, ship, robot and mechanical arm, etc., terminal device in 5G system, terminal device in evolved public land mobile network (PLMN), augmented reality (AR) device, virtual reality (VR) device, artificial intelligence (AI) device, smart home device or smart city device, etc. The embodiments of the present application do not limit the specific technology and specific device form adopted by the UE.

[0062] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a communication system provided in an embodiment of the present application is provided. Figure 1 Taking the 5G system as an example, the communication system includes UE, access network equipment, bearer network equipment and core network equipment.

[0063] like Figure 1 As shown, the access network equipment includes two base stations 1011 and 1012. The bearer network includes two bearer network subnets 1021 and 1022, each of which includes three routing devices (i.e., bearer network devices), which can be access layer box routers, integrated service bearer routers, and 5G core network customer edge (5G core network customer edge, 5GC CE) devices. The access layer box router can be, for example, a flexible transport network (ATN) device. The core network equipment includes AMF equipment, UPF equipment, SMF equipment, and UDM equipment.

[0064] It should be noted that the above Figure 1The structure is only an example and does not constitute a limitation on the structure of the communication system. For example, the communication system may also include a server that establishes a communication connection with the access network.

[0065] The embodiment of the present application provides a communication method, when the UE is in a normal service state on the 5G network and there is only one emergency bearer between the UE and the 5G network device, the normal bearer can be restored as soon as possible, thereby improving the call completion rate of the normal call and reducing the risk of not receiving a call back. The method can be applied to a communication system, such as Figure 1 The communication system shown is applicable to communication scenarios with or without an N26 interface.

[0066] Please refer to Figure 2 , Figure 2 A flow chart of a communication method provided in an embodiment of the present application, which can be applied to a UE. The method may include the following process:

[0067] 201. Identify a trigger instruction in a target state, where the target state includes that the UE is in a normal service state on the 5G network and there is only one emergency bearer between the UE and the 5G network device, and the trigger instruction includes a normal call instruction or a different system instruction.

[0068] The inter-system instruction is used to instruct the UE to switch from the 5G inter-system to the 4G network. The inter-system methods include but are not limited to: switching, redirection, reselection and network search. Among them, 5G networks include but are not limited to: NR networks and PLMN, and 4G networks include but are not limited to: LTE networks and CRAN.

[0069] 202. In response to the trigger instruction, send a first activation request to the network device, where the first activation request is used to request activation of a common bearer between the UE and the network device.

[0070] The network device is the network device to which the UE is currently connected. When the trigger instruction is a normal call instruction, the network device is a 5G network device. Taking the NR network device as an example, the first activation request may include a [UP]ID_NAS_NRSM_PDU_SESSION_EST_REQ message. The NR network device responds to [UP]ID_NAS_NRSM_PDU_SESSION_EST_REQ to activate the normal bearer, and replies to the UE with a [DN]ID_NAS_NRSM_PDU_SESSION_EST_ACP message after the normal bearer is successfully activated. UP means uplink, indicating the transmission direction of the message. ID means (identity), NAS means (non access stratum), NRSM means (NR bearer management, NR session management), EST means (establishment), and REQ means (request). DN means (downlink), indicating the transmission direction of the message. ACP means (accept, accept).

[0071] When the trigger instruction is a different system instruction, the network device is a 4G network device. The UE first responds to the trigger instruction and switches from the 5G network to the 4G network. After that, the UE first sends a second activation request to the 4G network device, and the second activation request is used to activate the default bearer between the UE and the 4G network device. After the default bearer is successfully activated, the first activation request is sent to the 4G network device.

[0072] Taking the LTE network as an example, after processing the first activation request, the LTE network device sends a default bearer activation request to the UE, and the default bearer activation request is used to activate the bearer context. The UE responds to the default bearer activation request, and if it accepts the default bearer, it sends a default bearer activation response to the network device. After the network device receives the default bearer activation response, the common bearer is successfully activated.

[0073] The default bearer activation request may include ESM_ACT_DEFLT_EPS_BEARER_CNTXT_REQ. ESM means (evolved packet system session management, EPS session management), ACT means (activate), DEFLT means (default), and CNTXT means (context). The default bearer activation response may include ESM_ACT_DEFLT_EPS_BEARER_CNTXT_ACP, and ACP means (accept).

[0074] When the common bearer is successfully activated, the UE may send an IMS registration message to the network device, and the IMS registration message is used for IMS registration. The IMS registration message may be an IMS_SIP_REGISTER message, where SIP means (session initialization protocol) and REGISTER means (registration).

[0075] After the UE successfully initiates IMS registration in the 5G network, it needs to complete the normal call service. The UE sends a normal call request to the 5G network device, which is used to request the normal call service. After the UE successfully initiates IMS registration in the 4G network, it can make calls and receive call-back services.

[0076] In summary, the communication method provided in the embodiment of the present application identifies the trigger instruction in the target state, the target state includes that the UE is in a normal service state on the 5G network and there is only one emergency bearer between the 5G network device, and the trigger instruction includes a normal call instruction or a heterosystem instruction, and then responds to the trigger instruction, sends a first activation request to the network device, and attempts to activate the normal bearer between the currently connected network device. When the trigger instruction is a normal call instruction, it can immediately and actively activate the normal bearer between the 5G network device, try to restore the normal call capability under the 5G network, and then perform normal call services. When the trigger instruction is a heterosystem instruction, the heterosystem is in the 4G network, and actively activates the normal bearer between the 4G network device, and tries to restore the normal service state of the UE under the 4G network, and then realizes normal calls and receives callbacks under the 4G network. Thereby, the continuity of the call service can be effectively guaranteed, the call completion rate of the call can be improved, and at the same time, the risk of not receiving a callback on the network side is reduced, and the overall communication performance is improved.

[0077] The following is an example of a trigger instruction that is a different system instruction. Figure 3 , Figure 3 A flow chart of another communication method provided in an embodiment of the present application, Figure 3 Taking the trigger instruction as a heterogeneous system instruction as an example, the method may include the following process:

[0078] 301. Identify the different system instructions in the target state, where the target state includes that the UE is in a normal service state on the 5G network and there is only one first emergency bearer between the UE and the 5G network device.

[0079] It should be noted that the UE may identify the foreign system instructions during the process of establishing a normal bearer with the 5G network equipment. At this time, the UE also identifies the foreign system instructions in the target state.

[0080] The inter-system instruction can be configured and sent by the 5G network equipment, which can instruct the UE to switch or redirect. The inter-system instruction can also be read by the UE from within itself, and the UE actively performs reselection or network search when there is no service.

[0081] 302. In response to the inter-system instruction, the inter-system is switched to the 4G network.

[0082] For example, the UE may respond to a different system instruction and change the system to a 4G network by switching, redirecting, reselecting, or losing the network and searching for the network.

[0083] When the heterosystem instruction is that the 5G network device instructs the UE to switch or redirect, the UE switches to the 4G network or redirects to the 4G network in response to the heterosystem instruction. When the heterosystem instruction is read by the UE from within itself, the UE measures the signal quality of the 5G service cell. When the signal quality is less than the threshold, the UE starts to measure the signal of the neighboring 4G cell. When the signal of the neighboring 4G cell is greater than the threshold, it reselects to reside in the 4G cell with the highest signal quality. Or the UE actively searches for a 4G cell when the signal of the currently residing 5G cell is weak or abnormal.

[0084] Optionally, before the inter-system to 4G network, the UE can locally record the identifier of the first emergency bearer, or locally record the state that there is only one emergency bearer between the UE and the 5G network device in the 5G network. This identifier or state is used to restore the original emergency bearer on the 5G network after the inter-system to 4G network.

[0085] The UE may perform the process 302 during a no-service period. No service may refer to no ordinary bearer-related service, such as no at least one of the following processes: IMS call, IMS registration, IMS SMS, IMS video call. No service may also refer to no data bearer-related service, such as no data packet transmission.

[0086] Here is an example of no service: for IMS bearer, there is no IMS bearer related service, such as: no IMS call, IMS registration, IMS SMS, IMS video call, etc. For data bearer, there is no data packet transmission and other related services.

[0087] 303. Send a first activation request to the 4G network device, where the first activation request is used to request activation of a first default bearer between the UE and the 4G network device.

[0088] The first activation request may include an EMM_ATTACH_REQ message, where EMM means (EPS mobility management) and ATTACH means (attachment). There is no need to distinguish the attach type when sending the message.

[0089] The 4G network device responds to EMM_ATTACH_REQ and replies EMM_ATTACH_ACP to the UE. Then the 4G network device sends ESM_ACT_DEFLT_EPS_BEARER_CNTXT_REQ to the UE, and the UE replies EMM_ATTACH_CMP, and then the UE replies ESM_ACT_DEFLT_EPS_BEARER_CNTXT_ACP. After the 4G network device receives ESM_ACT_DEFLT_EPS_BEARER_CNTXT_ACP, the first default bearer is successfully activated. Among them, CMP means (confirmation / completion, complete).

[0090] The first default bearer is activated through this process, so even if the subsequent common bearer activation fails, the existence of the first default bearer will prevent the UE from entering the restricted service state.

[0091] 304. When the first default bearer is activated successfully, send a second activation request to the 4G network device, where the second activation request is used to request activation of the first common bearer between the UE and the 4G network device.

[0092] The second activation request may carry a dedicated access point name (APN) of a common service, which may include an ESM_PDN_CONNECT_REQ message, where PDN means (packet data network) and CONNECT means (connection).

[0093] The process performed by the 4G network device after responding to the second activation request can refer to the aforementioned process 202, and the embodiment of the present application will not be described in detail here.

[0094] When the first common bearer is successfully activated, the UE can send a first IMS registration message to the 4G network device, and the first IMS registration message is used for IMS registration. This process can refer to the aforementioned process 202, and the embodiment of the present application is not repeated here. After the UE successfully initiates IMS registration under the 4G network, it can make calls and receive call-back services.

[0095] Optionally, when the first default bearer is successfully activated, the UE can also try to activate the second emergency bearer between the UE and the 4G network device. In one example, if the UE locally records the identifier of the first emergency bearer, or locally records the state that there is only one emergency bearer between the UE and the 5G network device in the 5G network, the UE obtains the second emergency bearer based on the identifier or state mapping recorded locally. In this way, there is no need to re-establish the second emergency bearer, which can shorten the establishment delay of the second emergency bearer and quickly implement emergency call services.

[0096] In another example, the UE may send a third activation request to the 4G network device, where the third activation request is used to request activation of a second emergency bearer between the UE and the 4G network device.

[0097] The third activation request may carry a dedicated APN for emergency services, which may include ESM_PDN_CONNECT_REQ. Taking the LTE network as an example, after processing the third activation request, the LTE network device sends a default bearer activation request to the UE, and the default bearer activation request is used to activate the bearer context. The UE responds to the default bearer activation request, and if the default bearer is accepted, it sends a default bearer activation response to the network device. After the network device receives the default bearer activation response, the second emergency bearer is successfully activated. The default bearer activation request may include ESM_ACT_DEFLT_EPS_BEARER_CNTXT_REQ, and the default bearer activation response may include ESM_ACT_DEFLT_EPS_BEARER_CNTXT_ACP.

[0098] For example, in the aforementioned Figure 2 In the illustrated embodiment, for the case where the trigger instruction is a call instruction, when the normal bearer activation between the UE and the 5G network device fails, the subsequent IMS registration fails, or the normal call fails, the system can also be changed to the 4G network. The normal bearer activation failure may be that the first activation response is not received, or the received response indicates that the 5G network device refuses to establish a normal bearer. The process of the different system can refer to the aforementioned process 302.

[0099] If the activation of the ordinary bearer between the UE and the 5G network device fails, or the ordinary bearer activation succeeds but the IMS registration fails (the established ordinary bearer will be released at this time), the UE is in the target state of the cross-system to the 4G network, so then refer to the aforementioned processes 303 and 307, first send a fourth activation request to the 4G network device, the fourth activation request is used to request the activation of the second default bearer between the UE and the 4G network device. Afterwards, when the second default bearer is activated successfully, a fifth activation request is sent to the 4G network device, the fifth activation request is used to request the activation of the second ordinary bearer between the UE and the 4G network device. When the second ordinary bearer is activated successfully, a second IMS registration message is sent to the 4G network device, and the second IMS registration message is used for IMS registration. The specific implementation process can refer to the aforementioned processes 303 and 307, and the embodiments of the present application are not described here.

[0100] Optionally, when the second common bearer is successfully activated, the UE may also send a sixth activation request to the 4G network device, where the sixth activation request is used to request activation of a third emergency bearer between the UE and the 4G network device. The establishment process of the third emergency bearer may refer to the establishment process of the aforementioned second emergency bearer, and the embodiments of the present application will not be described in detail herein.

[0101] If the normal bearer is activated successfully and the IMS registration is successful but the normal call fails, after the UE switches to the 4G network, it still has a normal bearer between it and the 4G network equipment. At this time, normal call services can be carried out directly in the 4G network.

[0102] In summary, the communication method provided in the embodiment of the present application identifies the heterosystem instruction in the target state, the target state includes that the UE is in a normal service state on the 5G network and there is only one first emergency bearer between the UE and the 5G network device, in response to the heterosystem instruction, the heterosystem is to the 4G network, and then the first activation request is sent to the 4G network device, the first activation request is used to request activation of the first default bearer between the UE and the 4G network device, after the first default bearer is successfully activated, the activation of the first ordinary bearer and the second emergency bearer between the UE and the 4G network device is requested. After the heterosystem is to the 4G network, it can immediately and actively activate the ordinary bearer and the second emergency bearer between the UE and the 4G network device, try to restore the normal service state of the UE in the 4G network, and then realize ordinary calls and receive callbacks in the 4G network. Thereby, the continuity of call services can be guaranteed, the call completion rate of calls can be improved, and at the same time, the risk of not receiving network-side callbacks is reduced, thereby improving the overall communication performance.

[0103] The sequence of the methods provided in the embodiments of the present application can be adjusted appropriately, and the process can be increased or decreased accordingly according to the situation. Any technician familiar with the technical field can easily think of a method of change within the technical scope disclosed in this application, which should be included in the protection scope of this application, and the embodiments of the present application do not limit this.

[0104] The above mainly introduces the communication method provided by the embodiment of the present application from the perspective of the device. It is understandable that, in order to realize the above functions, the device includes a hardware structure and / or software module corresponding to each function. Those skilled in the art should easily realize that, in combination with the algorithm steps of each example described in the embodiments disclosed herein, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present application.

[0105] The embodiment of the present application can divide the functional modules of the device according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one UE. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation.

[0106] Figure 4 A block diagram of a communication device provided in an embodiment of the present application, in the case of dividing each functional module according to each function, the communication device 400 may include a transceiver module 401 and a processing module 402. Exemplarily, the communication device may be a UE, or a chip therein or other combined devices, components, etc. having the functions of the above-mentioned communication device. When the communication device 400 is a UE, the transceiver module 401 may be a transceiver, and the transceiver may include an antenna and a radio frequency circuit, etc.; the processing module 402 may be a processor (or a processing circuit), such as a baseband processor, and the baseband processor may include one or more CPUs. When the communication device 400 is a device or component having the above-mentioned functions, the transceiver module 401 may be a radio frequency unit; the processing module 402 may be a processor (or a processing circuit), such as a baseband processor. When the communication device 400 is a chip system, the transceiver module 401 may be an input and output interface of a chip (such as a baseband chip); the processing module 402 may be a processor (or a processing circuit) of the chip system, and may include one or more central processing units. It should be understood that the transceiver module 401 in the embodiment of the present application can be implemented by a transceiver or a transceiver-related circuit component; the processing module 402 can be implemented by a processor or a processor-related circuit component (or, referred to as a processing circuit).

[0107] The transceiver module 401 can be used to execute Figure 2 and Figure 3 All transceiver operations in the embodiment shown, and / or other processes for supporting the technology described herein; the processing module 402 can be used to perform Figure 2 and Figure 3 All operations except the transceiver operation in the illustrated embodiment, and / or other processes for supporting the technology described herein. The transceiver module 401 may include a sending module and / or a receiving module, respectively, for performing Figure 2 and Figure 3 The sending and receiving operations in the embodiment shown. The communication device includes:

[0108] The transceiver module is used to identify the trigger instruction in the target state, the target state includes that the UE is in a normal service state on the fifth-generation mobile communication technology 5G network and there is only one first emergency bearer between the UE and the 5G network device, and the trigger instruction includes a normal call instruction or a different system instruction; the processing module is used to respond to the trigger instruction and send a first activation request to the network device, and the first activation request is used to request activation of the first normal bearer between the UE and the network device.

[0109] In combination with the above scheme, the trigger instruction is an inter-system instruction, and the network device is a 4G network device; the processing module is specifically used to: respond to the inter-system instruction, inter-system to 4G network; send a second activation request to the 4G network device, the second activation request is used to request activation of the first default bearer between the UE and the 4G network device; when the first default bearer is activated successfully, send the first activation request to the 4G network device.

[0110] In combination with the above solution, the transceiver module is also used to send a third activation request to the 4G network device when the first default bearer is activated successfully, and the third activation request is used to request activation of the second emergency bearer between the UE and the 4G network device.

[0111] In combination with the above scheme, the trigger instruction is a normal call instruction, the network device is a 5G network device, and the transceiver module is also used to send a normal call request to the 5G network device, and the normal call request is used to request a normal call service.

[0112] In combination with the above solution, the transceiver module is further used to send a first Internet Protocol Multimedia Subsystem IMS registration message to the network device when the first common bearer is successfully activated, and the first IMS registration message is used for IMS registration.

[0113] In combination with the above scheme, the processing module is also used to switch from the first common bearer to the 4G network when the activation of the first common bearer fails or the IMS registration fails; the transceiver module is also used to send a fourth activation request to the 4G network device, and the fourth activation request is used to request activation of the second default bearer between the UE and the 4G network device; the transceiver module is also used to send a fifth activation request to the 4G network device when the activation of the second default bearer is successful, and the fifth activation request is used to request activation of the second common bearer between the UE and the 4G network device.

[0114] In combination with the above solution, the transceiver module is also used to send a sixth activation request to the 4G network device when the second default bearer is activated successfully, and the sixth activation request is used to request activation of the third emergency bearer between the UE and the 4G network device.

[0115] In combination with the above solution, the transceiver module is also used to send a second IMS registration message to the 4G network device when the second common bearer is successfully activated, and the second IMS registration message is used for IMS registration.

[0116] Figure 5 Schematic diagram of the structure of an electronic device provided in an embodiment of the present application, the electronic device 500 may be a UE or a chip or a functional module in the UE. Figure 5 As shown, the electronic device 500 includes a processor 501 , a transceiver 502 and a communication circuit 503 .

[0117] The processor 501 is used to execute the following Figure 2 and Figure 3 In any step of the method embodiment shown, and when executing a process such as receiving an activation response, the transceiver 502 and the communication line 503 may be selectively called to complete the corresponding operation.

[0118] Furthermore, the electronic device 500 may further include a memory 504. The processor 501, the memory 504 and the transceiver 502 may be connected via a communication line 503.

[0119] The transceiver 502 is used to communicate with other devices or other communication networks, such as Ethernet, radio access network (RAN), wireless local area network (WLAN), etc. The transceiver 502 can be a module, a circuit, a transceiver or any device capable of achieving communication.

[0120] The transceiver 502 is mainly used for sending and receiving messages, etc., and may include a transmitter and a receiver, which respectively send and receive messages, etc.; operations other than sending and receiving messages, etc. are implemented by the processor, such as different systems to 4G networks, etc.

[0121] The communication line 503 is used to transmit information between the components included in the electronic device 500.

[0122] In one design, the processor may be considered as the logic circuit and the transceiver may be considered as the interface circuit.

[0123] The memory 504 is used to store instructions, where the instructions may be computer programs.

[0124] It should be noted that the memory 504 can exist independently of the processor 501, or can be integrated with the processor 501. The memory 504 can be used to store instructions or program codes or some data, etc. The memory 504 can be located inside the electronic device 500, or outside the electronic device 500, without limitation. The processor 501 is used to execute the instructions stored in the memory 504 to implement the method provided in the above embodiment of the present application.

[0125] In one example, the processor 501 may include one or more processors, such as Figure 5 Processor 0 and processor 1 in.

[0126] As an optional implementation, the electronic device 500 includes multiple processors, for example, Figure 5 In addition to the processor 501, a processor 507 may also be included.

[0127] As an optional implementation, the electronic device 500 further includes an output device 505 and an input device 506. Exemplarily, the input device 506 is a device such as a keyboard, a mouse, a microphone or a joystick, and the output device 505 is a device such as a display screen and a speaker.

[0128] It should be noted that the electronic device 500 may be a chip system or a Figure 5 Devices with similar structures in the chip system. Among them, the chip system can be composed of chips, or it can include chips and other discrete devices. The actions, terms, etc. involved in the various embodiments of this application can refer to each other without limitation. The message name or parameter name in the message exchanged between the various devices in the embodiment of this application is only an example, and other names can also be used in the specific implementation without limitation. In addition, Figure 5 The components shown in the figure do not constitute a limitation on the electronic device 500. Figure 5 In addition to the components shown, the electronic device 500 may include Figure 5 More or fewer components may be shown, or certain components may be combined, or the components may be arranged differently.

[0129] The processor and transceiver described in the present application can be implemented in an integrated circuit (IC), an analog IC, a radio frequency integrated circuit, a mixed signal IC, an application specific integrated circuit (ASIC), a printed circuit board (PCB), an electronic device, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductor (CMOS), N-type metal oxide semiconductor (NMOS), P-type metal oxide semiconductor (positive channel metal oxide semiconductor, PMOS), bipolar junction transistor (BJT), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0130] Figure 6 The following is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device can be applied to the scenario shown in the above method embodiment. For the convenience of explanation, Figure 6 Only the main components of the communication device are shown, including a processor, a memory, a control circuit, and an input-output device. The processor is mainly used to process the communication protocol and communication data, execute the software program, and process the data of the software program. The memory is mainly used to store the software program and data. The control circuit is mainly used for power supply and transmission of various electrical signals. The input-output device is mainly used to receive data input by the user and output data to the user.

[0131] When the communication device is a UE, the control circuit may be a mainboard, the memory may include a hard disk, RAM, ROM and other media with storage functions, the processor may include a baseband processor and a central processing unit, the baseband processor is mainly used to process the communication protocol and communication data, the central processing unit is mainly used to control the entire communication device, execute software programs, and process the data of software programs, and the input and output devices include a display screen, a keyboard and a mouse, etc.; the control circuit may further include or be connected to a transceiver circuit or a transceiver, such as a network cable interface, etc., for sending or receiving data or signals, such as data transmission and communication with other devices. Furthermore, it may also include an antenna for sending and receiving requests, and for data / request transmission with other devices.

[0132] According to the method provided in the embodiments of the present application, the present application also provides a computer program product, which includes a computer program code. When the computer program code runs on a computer, the computer executes any of the methods described in the embodiments of the present application.

[0133] The embodiment of the present application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be executed by a computer or a device with communication capabilities to execute a computer program or instruction to control the relevant hardware to complete. The computer program or the group of instructions can be stored in the above computer-readable storage medium. When the computer program or the group of instructions is executed, it may include the processes of the above method embodiments. The computer-readable storage medium may be an internal storage unit of the UE of any of the above embodiments, such as a hard disk or memory of the UE. The above computer-readable storage medium may also be an external storage device of the above UE, such as a plug-in hard disk, a smart memory card (smart media card, SMC), a secure digital (secure digital, SD) card, a flash card (flash card), etc. equipped on the above UE. Further, the above computer-readable storage medium may also include both the internal storage unit of the above UE and an external storage device. The above computer-readable storage medium is used to store the above computer program or instruction and other programs and data required by the above UE. The above computer-readable storage medium can also be used to temporarily store data that has been output or is to be output.

[0134] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0135] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the device described above can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0136] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0137] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0138] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0139] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for a computer device (personal computer, server, or network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

[0140] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims. The above mainly introduces the communication method provided in the embodiment of the present application from the perspective of the device. It can be understood that in order to achieve the above functions, the device includes a hardware structure and / or software module corresponding to each function. It should be easy for those skilled in the art to realize that, in combination with the algorithm steps of each example described in the embodiment disclosed in this article, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in the form of hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

Claims

1. A communication method, characterized in that: The method comprises: Identify a trigger instruction in a target state, wherein the target state includes the UE being in a normal service state on a fifth generation mobile communication technology 5G network and having only one first emergency bearer between the UE and the 5G network device, and the trigger instruction includes a normal call instruction or a different system instruction; In response to the trigger instruction, a first activation request is sent to a network device, where the first activation request is used to request activation of a first common bearer between the UE and the network device.

2. The method according to claim 1, characterized in that The trigger instruction is the different system instruction, and the network device is a fourth generation mobile communication technology 4G network device; The sending a first activation request to the network device in response to the trigger instruction includes: In response to the different system instruction, different system to 4G network; Sending a second activation request to the 4G network device, where the second activation request is used to request activation of a first default bearer between the UE and the 4G network device; When the first default bearer is activated successfully, the first activation request is sent to the 4G network device.

3. The method according to claim 2, characterized in that The method further comprises: When the first default bearer is activated successfully, a third activation request is sent to the 4G network device, where the third activation request is used to request activation of a second emergency bearer between the UE and the 4G network device.

4. The method according to claim 1, characterized in that The trigger instruction is the common call instruction, the network device is the 5G network device, and the method further includes: Send a normal call request to the 5G network device, where the normal call request is used to request a normal call service.

5. The method according to any one of claims 1 to 4, characterized in that The method further comprises: When the first common bearer is activated successfully, a first Internet Protocol Multimedia Subsystem IMS registration message is sent to the network device, where the first IMS registration message is used for IMS registration.

6. The method according to claim 5, characterized in that The method further comprises: When the activation of the first common bearer fails or the IMS registration fails, switching to a 4G network; Sending a fourth activation request to the 4G network device, where the fourth activation request is used to request activation of a second default bearer between the UE and the 4G network device; When the second default bearer is activated successfully, a fifth activation request is sent to the 4G network device, where the fifth activation request is used to request activation of a second common bearer between the UE and the 4G network device.

7. The method according to claim 6, characterized in that The method further comprises: When the second default bearer is activated successfully, a sixth activation request is sent to the 4G network device, where the sixth activation request is used to request activation of a third emergency bearer between the UE and the 4G network device.

8. The method according to claim 6 or 7, characterized in that: The method further comprises: When the second common bearer is activated successfully, a second IMS registration message is sent to the 4G network device, where the second IMS registration message is used for IMS registration.

9. A communication device, characterized in that: The device comprises: A transceiver module, configured to identify a trigger instruction in a target state, wherein the target state includes the UE being in a normal service state on a fifth-generation mobile communication technology 5G network and having only one first emergency bearer between the UE and the 5G network device, and the trigger instruction including a normal call instruction or a different system instruction; The processing module is used to send a first activation request to the network device in response to the trigger instruction, where the first activation request is used to request activation of a first common bearer between the UE and the network device.

10. The device according to claim 9, characterized in that The trigger instruction is the different system instruction, and the network device is a fourth generation mobile communication technology 4G network device; The processing module is specifically used for: In response to the different system instruction, different system to 4G network; Sending a second activation request to the 4G network device, where the second activation request is used to request activation of a first default bearer between the UE and the 4G network device; When the first default bearer is activated successfully, the first activation request is sent to the 4G network device.

11. The device according to claim 10, characterized in that The transceiver module is further used to send a third activation request to the 4G network device when the first default bearer is activated successfully, and the third activation request is used to request activation of a second emergency bearer between the UE and the 4G network device.

12. The device according to claim 9, characterized in that The trigger instruction is the normal call instruction, the network device is the 5G network device, and the transceiver module is also used to send a normal call request to the 5G network device, and the normal call request is used to request a normal call service.

13. The device according to any one of claims 9 to 12, characterized in that The transceiver module is further used to send a first Internet Protocol Multimedia Subsystem IMS registration message to the network device when the first common bearer is successfully activated, and the first IMS registration message is used for IMS registration.

14. The device according to claim 13, characterized in that The processing module is further configured to switch from a different system to a 4G network when activation of the first common bearer fails or registration of the IMS fails; The transceiver module is further used to send a fourth activation request to the 4G network device, where the fourth activation request is used to request activation of a second default bearer between the UE and the 4G network device; The transceiver module is further used to send a fifth activation request to the 4G network device when the second default bearer is activated successfully, and the fifth activation request is used to request activation of the second common bearer between the UE and the 4G network device.

15. The device according to claim 14, characterized in that The transceiver module is further used to send a sixth activation request to the 4G network device when the second default bearer is activated successfully, and the sixth activation request is used to request activation of a third emergency bearer between the UE and the 4G network device.

16. The device according to claim 14 or 15, characterized in that The transceiver module is also used to send a second IMS registration message to the 4G network device when the second common bearer is successfully activated, and the second IMS registration message is used for IMS registration.

17. A communication device, characterized in that: The device comprises: one or more processors; a memory for storing one or more computer programs or instructions; When one or more computer programs or instructions are executed by one or more processors, the one or more processors implement the method according to any one of claims 1 to 8.

18. A communication device, characterized in that: The device comprises: Processing circuits and interface circuits; Wherein, the interface circuit is used to couple with a memory outside the communication device and provide a communication interface for the processing circuit to access the memory; The processing circuit is used to execute program instructions in the memory to implement the method according to any one of claims 1 to 8.

19. A communication system, characterized in that: The system comprises: User equipment UE and network equipment; The UE is configured to execute the method according to any one of claims 1 to 8.

20. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores program codes, and when the program codes are executed by a processor, the method according to any one of claims 1 to 8 is implemented.

Images