Network registration method, communication system, and storage medium

Abstract

An embodiment of the present application provides a network registration method, which is applied to a communication system, the communication system including an SM module and an MM module. The method includes: if the switching result from a first communication network to a second communication network is a switching failure, then based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network.

Description

Technical Field

[0001] The present invention relates to the field of communication technology, and in particular to a network registration method, a communication system, and a storage medium. Background Art

[0002] In the coexistence of the fourth generation (4G) and fifth generation (5G) mobile communication technologies, cross-standard situations may occur. For example, during the 4G->5G->4G Inter Radio Access Technology (IRAT) handover process, registration is successful in 4G, and registration needs to be initiated from 4G->5G. At this time, the registration process may fail, and IRAT returns to 4G. Currently, the specific cause of registration failure is not distinguished during the IRAT process, which may lead to rejection by the network. If the registration process is reinitiated, there is a problem of increased waste of air interface resources, and there is also the problem of inconsistent Packet Data Protocol (PDP) context between the terminal and the network. Summary of the Invention

[0003] The embodiments of the present application provide a network registration method, a communication system, and a storage medium, which can minimize registration failures and thereby reduce the waste of air interface resources.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] In a first aspect, an embodiment of the present application provides a network registration method, which is applied to a communication system including an SM module and an MM module, and includes:

[0006] If the switching result from the first communication network to the second communication network is a switching failure, based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request to the first communication network to return from the second communication network to the first communication network.

[0007] In a second aspect, an embodiment of the present application provides a communication system, the communication system comprising: an initiating unit,

[0008] The initiating unit is configured to, if the switching result from the first communication network to the second communication network is a switching failure, initiate, by the SM module and the MM module, a registration request to the first communication network to return from the second communication network to the first communication network based on whether there is interaction with the second communication network.

[0009] In a third aspect, an embodiment of the present application provides a communication system, wherein the communication system includes an SM module and an MM module.

[0010] The SM module and the MM module are configured to initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network if the switching result from the first communication network to the second communication network is a switching failure.

[0011] In a fourth aspect, an embodiment of the present application provides a communication system, comprising: a processor and a memory; wherein,

[0012] The memory is used to store a computer program that can be run on the processor;

[0013] The processor is configured to execute the network registration method described above when running the computer program.

[0014] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, characterized in that computer program code is stored on the storage medium, and when the computer program code is executed by a computer, the network registration method as described above is implemented.

[0015] The embodiment of the present application provides a network registration method, a communication system, and a storage medium. The method is applied to a communication system, and the communication system includes an SM module and an MM module. The method includes: if the switching result from the first communication network to the second communication network is a switching failure, then based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network to the first communication network. It can be seen that if the switch from the first communication network to the second communication network fails, the SM module and the MM module can first initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network. That is to say, after the switching fails, the SM module and the MM module can use different methods to initiate a registration request to the first communication network according to different situations of whether there is interaction with the network side, so as to successfully return from the second communication network to the first communication network, thereby minimizing the situation of registration failure and reducing the waste of air interface resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the 4G->5G->4G IRAT switching process proposed in an embodiment of the present application;

[0017] Figure 2 Schematic diagram of the 4G->5G IRAT switching process proposed in an embodiment of the present application;

[0018] Figure 3 Schematic diagram of the network registration method proposed in this application embodiment Figure 1 ;

[0019] Figure 4 A schematic diagram of the communication system structure proposed in an embodiment of the present application;

[0020] Figure 5 Schematic diagram of the network registration method proposed in this application embodiment Figure 2 ;

[0021] Figure 6 Schematic diagram of the network registration method proposed in this application embodiment Figure 3 ;

[0022] Figure 7 Schematic diagram of the network registration method proposed in this application embodiment Figure 4 ;

[0023] Figure 8 Schematic diagram of the network registration method proposed in this application embodiment Figure 5 ;

[0024] Figure 9 Schematic diagram of the network registration method proposed in this application embodiment Figure 6 ;

[0025] Figure 10 Schematic diagram of the network registration method proposed in this application embodiment Figure 7 ;

[0026] Figure 11 Schematic diagram of the network registration method proposed in this application embodiment Figure 8 ;

[0027] Figure 12 Schematic diagram of the network registration method proposed in this application embodiment Figure 9 ;

[0028] Figure 13 Schematic diagram of the network registration method proposed in this application embodiment Figure 10 ;

[0029] Figure 14 Schematic diagram of the network registration method proposed in this application embodiment Figure 10 one;

[0030] Figure 15 Schematic diagram of the network registration method proposed in this application embodiment Figure 10 two;

[0031] Figure 16 Schematic diagram of the structure of the communication system proposed in this application embodiment Figure 1 ;

[0032] Figure 17 Schematic diagram of the structure of the communication system proposed in this application embodiment Figure 2 . DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. It should be understood that the specific embodiments described herein are only used to explain the related applications and are not intended to limit the applications. It should also be noted that for ease of description, only the portions relevant to the related applications are shown in the drawings.

[0034] Since the current 4G network coverage is already very comprehensive and can meet the needs of the vast majority of people, operators are now choosing a hybrid networking method of 5G and 4G networks. This can not only meet people's daily needs but also gradually build 5G networks while saving costs. Judging from the current networking situation of operators, 4G networks and 5G networks are a long-term coexistence process. In order to achieve a smooth transition of services, the N26 interface has been added between the 4G core network MME and the 5G core network AMF. Whether the N26 interface exists affects the security context of the UE and the core network, the conversion of the PDP context, and the cross-standard processes such as handover (HO) / reselection (reselect) / redirection (redirect) between 4G and 5G networks. The UE process is also different depending on whether N26 is present.

[0035] In the case of cross-standard coexistence of 4G and 5G networks, take the 4G->5G->4G IRAT process as an example. Figure 1 This is a schematic diagram of the 4G->5G->4G IRAT switching process proposed in the embodiment of the present application, as shown in FIG. Figure 1 As shown, registration is successful in 4G, and registration needs to be initiated for 4G->5G. At this time, the registration process may fail, and IRAT returns to 4G. Since it is IRAT 5G->4G, the UE will use the 5G security context, the 5G mapped GUTI, and the 5G to 4G mapped pdpcontext for registration. At this time, there may be no interaction with the AMF in 5G, resulting in the 4G core network failing to pass integrity protection. The network may reject the UE or re-carry the attachment request during the Security Mode Command (SMC) process, affecting the UE user experience or increasing the waste of air interface resources. The same is true for 5G->4G->5G. AS represents the access layer (Access Stratum) and NET represents the network side.

[0036] The N26 interface notifies the UE in the registration acceptance message. The initial registration initiated by the UE may not be accurate depending on whether N26 is enabled. Figure 2 This is a schematic diagram of the 4G->5G IRAT switching process proposed in the embodiment of the present application, as shown in FIG. Figure 2 As shown, for example, the current 4G UE has N26, IRAT to 5G, the UE will carry the Session Management (SM) context to the registration request. At this time, the UE is notified in the acceptance message that there is no N26 interface. The network side may set all PDP contexts to 0 or not carry synchronization information elements. At this time, the UE may locally release the PDP context or keep it unchanged, resulting in inconsistent PDP contexts between the terminal and the network.

[0037] Currently, the IRAT process typically doesn't distinguish the specific cause of registration failures, which can lead to rejection by the network, requiring the network to re-initiate the registration process, resulting in a poor user experience and increased waste of air interface resources. Furthermore, if the N26 interface goes from being present to not present during the IRAT process, such as in step 4->5, the PDP context between the UE and the network becomes out of sync, resulting in service interruption and a poor user experience.

[0038] In order to solve the problem that the specific reasons for registration failure are not distinguished during the common IRAT handover process, resulting in network rejection and increased waste of air interface resources, the embodiments of the present application provide a network registration method, a communication system, and a storage medium. The method is applied to a communication system, and the communication system includes an SM module and an MM module. The method includes: if the handover result from the first communication network to the second communication network is a handover failure, then based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network to the first communication network. It can be seen that if the handover from the first communication network to the second communication network fails, the SM module and the MM module can first initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network. That is, after the handover fails, the SM module and the MM module can use different methods to initiate registration requests to the first communication network according to different situations of whether there is interaction with the network side, so as to successfully return from the second communication network to the first communication network, thereby minimizing the number of registration failures and thus reducing the waste of air interface resources.

[0039] The technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application.

[0040] An embodiment of the present application provides a network registration method, which is applied to a communication system including an SM module and an MM module. Figure 3 Schematic diagram of the network registration method proposed in this application embodiment Figure 1 ,like Figure 3 As shown, in an embodiment of the present application, the method for performing network registration of a communication system may include the following steps:

[0041] Step 101: If the switching result from the first communication network to the second communication network is a switching failure, then based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request to the first communication network to return from the second communication network to the first communication network.

[0042] In an embodiment of the present application, if the switching result from the first communication network to the second communication network is a switching failure, based on whether there is interaction with the second communication network, the SM module and the MM module can initiate a registration request to the first communication network to return from the second communication network to the first communication network.

[0043] It should be noted that in an embodiment of the present application, before switching from the first communication network to the second communication network, the system successfully resides in the first communication network and is normally registered with the first communication network. When the MM module receives the signaling to switch from the first communication network to the second communication network, it can switch from the first communication network to the second communication network.

[0044] It should be noted that in the embodiments of the present application, the first communication network and the second communication network may be communication networks of different communication standards, wherein the first communication network and the second communication network may refer to any type of communication network. For example, the first communication network may be 4G and the second communication network may be 5G; or the first communication network may be 5G and the second communication network may be 4G.

[0045] It can be understood that, in some embodiments, the present application does not specifically limit the types of the first communication network and the second communication network.

[0046] It should be noted that, in the embodiments of this application, Figure 4 This is a schematic diagram of the communication system structure proposed in the embodiment of the present application, such as Figure 4 As shown, the communication system may include an SM module and an MM module. The SM module may correspond to a session management function (SMF) entity module, and the MM module may correspond to an access and mobility management function (AMF) entity module.

[0047] It should be noted that, in the embodiments of the present application, the SM module and the MM module can determine whether there is interaction with the second communication network during the network switching process. That is, in the present application, during the switching process from the first communication network to the second communication network, if the switching result is a switching failure, there are two situations, namely, one situation may be that there is interaction with the second communication network during the network switching process, and the other situation is that there is no interaction with the second communication network during the network switching process.

[0048] It should be noted that in the embodiments of the present application, when determining whether there is interaction with the second communication network, the SM module and the MM module can determine whether there is interaction based on whether a specific rejection reason from the network is received. For example, based on a received link establishment rejection or a connection release, whether there is interaction with the network side can be determined; or it can be determined based on the actual situation according to the mode of interaction with the network side, that is, whether there is interaction with the network. This application does not specifically limit the method for determining whether there is interaction with the second communication network.

[0049] It should be noted that in the embodiment of the present application, the SM module and the MM module may initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network.

[0050] It is understandable that in the embodiments of the present application, the SM module and the MM module can adaptively adopt different methods to perform subsequent network registration processing based on whether there is interaction with the second communication network. That is, depending on whether there is interaction with the second communication network, the SM module and the MM module can initiate different registration requests to the first communication network, and improve the network-side reception success rate by classifying the registration requests, so as to successfully return from the second communication network to the first communication network, thereby minimizing registration failures and reducing the waste of air interface resources.

[0051] It can be understood that in an embodiment of the present application, the SM module and the MM module can initiate different registration requests to the first communication network for different situations of whether there is interaction with the second communication network during the switching process from the first communication network to the second communication network, thereby reducing the situation of registration failure.

[0052] Furthermore, in an embodiment of the present application, if there is interaction with the second communication network, when the SM module and the MM module initiate a registration request from the second communication network to the first communication network, the MM module can send a pdp context query signaling to the SM module; in response to the pdp context query signaling, the SM module can send the pdp context corresponding to the second communication network to the MM module; the MM module can generate a first registration request based on the pdp context corresponding to the second communication network, and send the first registration request to the first communication network.

[0053] It should be noted that in an embodiment of the present application, if there is interaction with the second communication network, it means that the user has resided in the second communication network. After the MM module sends the pdp context query signaling to the SM module, due to the interaction with the second communication network, the SM module can send the pdp context corresponding to the second communication network to the MM module, so that the MM module can generate a first registration request based on the pdp context corresponding to the second communication network, and thus can send the first registration request to the network side, that is, the first communication network.

[0054] Furthermore, in an embodiment of the present application, the first registration request may include information such as a security context corresponding to the second communication network, a globally unique temporary UE identity (GUTI), and a key set identifier (KSI).

[0055] For example, in the embodiments of the present application, Figure 5 Schematic diagram of the network registration method proposed in this application embodiment Figure 2 ,like Figure 5As shown, assuming that the first communication network is 4G and the second communication network is 5G, the current terminal device successfully resides in 4G, the MM module receives the switching signaling from 4G to 5G (AS_NAS_IRAT_CHANGE_IND(4->5)), and sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module. In response to the pdp context query signaling, the SM module sends a pdp context mapped from 4G to 5G (MM_SM_PDP_CONTEXT_QUREY_CNF). The MM module initiates a registration request (REGISTRATION SEQ) based on the pdp context (first pdp context) mapped from 4G to 5G. REQUEST), if the registration of the second communication network, i.e., 5G, fails and there is interaction with 5G, then when the MM module initiates a registration request from 5G to 4G to the network side (4G), the MM module may send a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module again; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to 5G to the MM module; the MM module generates a first registration request based on the pdp context corresponding to 5G, and sends the first registration request to the network side (4G). The first registration request may include information such as the security context, GUTI, and KSI corresponding to 5G, and the first registration request may refer to a Tacking Area Update (TAU) request initiated by the MM module, where AS represents the access layer (Access Stratum) and NET represents the network side.

[0056] For example, in the embodiments of the present application, Figure 6 Schematic diagram of the network registration method proposed in this application embodiment Figure 3 ,like Figure 6As shown, assuming that the first communication network is 5G and the second communication network is 4G, the current terminal device successfully resides in 5G, the MM module receives the switching signaling from 5G to 4G (AS_NAS_IRAT_CHANGE_IND(5->4)), and sends the pdp context query signaling ((MM_SM_PDP_CONTEXT_QUREY_REQ)) to the SM module. In response to the pdp context query signaling, the SM module sends the pdp context mapped from 5G to 4G (MM_SM_PDP_CONTEXT_QUREY_CNF). The MM module initiates a registration request (REGISTRATION) based on the pdp context (second pdp context) mapped from 5G to 4G. REQUEST), if the registration of the second communication network, i.e., 4G, fails and there is interaction with 4G, then when the MM module initiates a registration request from 4G to 5G to the network side (5G), the MM module may send a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module again; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to 4G to the MM module; the MM module generates a registration request based on the pdp context corresponding to 4G, and sends the registration request to the network side (5G), which may include information such as the security context, GUTI, and KSI corresponding to 4G, and the registration request may refer to an initial registration request initiated by the MM module, or a normal mobility registration type request.

[0057] It should be noted that in an embodiment of the present application, if there is no interaction with the second communication network, when the SM module and the MM module initiate a registration request from the second communication network to the first communication network, the MM module can send a pdp context query signaling to the SM module; in response to the pdp context query signaling, the SM module can send the pdp context corresponding to the first communication network to the MM module; the MM module can generate a second registration request based on the pdp context corresponding to the first communication network, and send the second registration request to the first communication network.

[0058] It should be noted that in an embodiment of the present application, if there is no interaction with the second communication network, it means that there has been no residence in the second communication network. After the MM module sends the pdp context query signaling to the SM module, since there is no interaction with the second communication network, the SM module can send the pdp context corresponding to the first communication network to the MM module, so that the MM module can generate a second registration request based on the pdp context corresponding to the first communication network, and thus can send the second registration request to the first communication network.

[0059] It should be noted that, in the embodiment of the present application, the second registration request may include the security context, GUTI and KSI corresponding to the first communication network.

[0060] For example, in the embodiments of the present application, Figure 7 Schematic diagram of the network registration method proposed in this application embodiment Figure 4 ,like Figure 7 As shown, assuming that the first communication network is 4G and the second communication network is 5G, the current terminal device successfully resides in 4G, the MM module receives the switching signaling from 4G to 5G (AS_NAS_IRAT_CHANGE_IND(4->5)), and sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module. In response to the pdp context query signaling, the SM module sends a pdp context mapped from 4G to 5G (MM_SM_PDP_CONTEXT_QUREY_CNF). The MM module initiates a registration request (REGISTRATION SEQ) based on the pdp context (first pdp context) mapped from 4G to 5G. REQUEST), if the registration of the second communication network, i.e., 5G, fails and there is no interaction with 5G, then when the MM module initiates a registration request from 5G to 4G to the network side (4G), the MM module may send a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module again; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to 4G to the MM module; the MM module generates a second registration request based on the pdp context corresponding to 4G, and sends the second registration request to the network side (4G), the second registration request may include information such as the security context, GUTI, and KSI corresponding to 4G, and the second registration request may refer to the MM module initiating a tracking area update (TAU) request, where AS represents the access layer (Access Stratum) and NET represents the network side.

[0061] For example, in the embodiments of the present application, Figure 8 Schematic diagram of the network registration method proposed in this application embodiment Figure 5 ,like Figure 8As shown, assuming that the first communication network is 5G and the second communication network is 4G, the current terminal device successfully resides in 5G, the MM module receives the switching signaling from 5G to 4G (AS_NAS_IRAT_CHANGE_IND(5->4)), and sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module. In response to the pdp context query signaling, the SM module sends a pdp context mapped from 5G to 4G (MM_SM_PDP_CONTEXT_QUREY_CNF). The MM module maps the 5G to 4G based on the 5G mapping. The MM module initiates a registration request based on the pdp context (second pdp context) of the second communication network, i.e., 4G. If the registration of the second communication network, i.e., 4G, fails and there is no interaction with 4G, then when the MM module initiates a registration request from 4G to 5G to the network side (5G), the MM module may send a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module again; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to 5G to the MM module; the MM module generates a registration request (REGISTRATION REQUES T) based on the pdp context corresponding to 5G, and sends the registration request to the network side (5G). The registration request may include information such as the security context, GUTI, and KSI corresponding to 5G, and the registration request may refer to an initial registration request initiated by the MM module, or a normal mobility registration type request. AS represents the access layer (Access Stratum) and NET represents the network side.

[0062] It should be noted that in an embodiment of the present application, when the SM module and the MM module initiate a registration request from the second communication network to the first communication network, the SM module can send the pdp contexts corresponding to different communication networks to the MM module according to different situations of whether there is interaction with the second communication network; the MM module generates different registration requests based on the pdp contexts corresponding to different communication networks, and then sends different registration requests to the first communication network.

[0063] That is to say, in this application, the registration request initiated by the MM module is different for different situations of whether there is interaction with the second communication network. Among them, if there is interaction with the second communication network, the registration request includes the security context, GUTI and KSI corresponding to the second communication network; if there is no interaction with the second communication network, the registration request includes the security context, GUTI and KSI corresponding to the first communication network; by classifying the registration request, the reception success rate of the network side (first communication network) is improved, thereby minimizing the number of registration failures and reducing the waste of air interface resources.

[0064] Furthermore, in the embodiments of the present application, Figure 9 Schematic diagram of the network registration method proposed in this application embodiment Figure 6 ,like Figure 9 As shown, when the first communication network is 4G, the second communication network is 5G, and an N26 interface exists between the first access management network element of the first communication network and the second access management network element of the second communication network, the method for network registration of the communication network may further include the following steps:

[0065] Step 102: During the handover process from the first communication network to the second communication network, the MM module receives first registration information sent by the network side; wherein the first registration information includes the protocol data unit (PDU) session state and N26 interface parameters.

[0066] In an embodiment of the present application, during a switching process from a first communication network to a second communication network, the MM module may receive first registration information sent by the network side; wherein the first communication network is 4G and the second communication network is 5G.

[0067] It should be noted that in an embodiment of the present application, when the first communication network is 4G and the second communication network is 5G, the first access management network element of the first communication network is a mobility management entity (Mobility Management Entity, MME), and the second access management network element of the second communication network is an access and mobility management function (Access and Mobility Management Function, AMF), and the N26 interface may refer to the interface between MME and AMF.

[0068] It should be noted that, in the embodiment of the present application, it is explained that there is an N26 interface between the first access management network element of the first communication network and the second access management network element of the second communication network.

[0069] It should be noted that, in an embodiment of the present application, the first registration information may include the PDU session status and N26 interface parameters; wherein, the N26 interface parameters can determine whether the N26 interface exists.

[0070] Exemplarily, in an embodiment of the present application, the N26 interface parameter may indicate that there is no N26 interface between the first access management network element and the second access management network element, and the N26 interface parameter may also indicate that there is an N26 interface between the first access management network element and the second access management network element.

[0071] Step 103: The MM module sends the PDU session status and N26 interface parameters to the SM module.

[0072] In an embodiment of the present application, after receiving the first registration information including the PDU session status and N26 interface parameters sent by the network side, the MM module may send the PDU session status and the N26 interface parameters to the SM module.

[0073] Step 104: If the N26 interface parameter indicates that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session state.

[0074] In an embodiment of the present application, if the N26 interface parameter indicates that there is no N26 interface between the first access management network element and the second access management network element, the SM module can initiate a PDU session switching process based on the PDU session state.

[0075] It should be noted that in an embodiment of the present application, if the second registration information includes that there is no N26 interface between the first access management network element and the second access management network element, then the SM module initiates a PDU session switching process directly to the network side (second communication network) based on the PDU session state, thereby ensuring that the PDP context of the terminal and the network remains consistent, thereby improving business continuity.

[0076] It should be noted that, in the embodiments of this application, Figure 10 Schematic diagram of the network registration method proposed in this application embodiment Figure 7 ,like Figure 10 As shown, when the first communication network is 4G, the second communication network is 5G, and there is an N26 interface between the first access management network element of the first communication network and the second access management network element of the second communication network, during the switching process from the first communication network to the second communication network, the MM module receives the first registration information (REGISTRATION ACCEPT) sent by the network side; wherein the first registration information includes the protocol data unit (PDU) session status and the N26 interface parameters; the MM module sends the PDU session status and N26 interface parameters (MM_SM_PDP_CONTEXT_UPDATA_IND) to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session status, and the third PDP context can refer to the PDP context mapped from 4G to 5G, AS represents the access layer (Access Stratum), and NET represents the network side.

[0077] Furthermore, in an embodiment of the present application, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, in the return process from the second communication network to the first communication network, the MM module receives the second registration information sent by the network side; wherein the second registration information includes the PDU session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session status.

[0078] Furthermore, in the embodiments of the present application, Figure 11 Schematic diagram of the network registration method proposed in this application embodiment Figure 8 ,like Figure 11 As shown, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, if there is interaction with the second communication network, when the MM module initiates a registration request from the second communication network to the first communication network to the network side (the first communication network), the MM module sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module; in response to the pdp context query signaling, the SM module sends a pdp context (MM_SM_PDP_CONTEXT_QUREY_CNF) corresponding to the second communication network to the MM module; the MM module generates a first registration request based on the pdp context corresponding to the second communication network, and sends the first registration request (REGISTRATION REQUEST) to the network side (the first communication network), and the MM module can receive the second registration information (REGISTRATION REQUEST) sent by the network side. ACCEPT); wherein, the second registration information includes a PDU session status and an N26 interface parameter; the MM module sends the PDU session status and the N26 interface parameter to the SM module; if the N26 interface parameter indicates that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session status, where AS represents the access layer (Access Stratum) and NET represents the network side.

[0079] That is to say, in an embodiment of the present application, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, if there is interaction with the second communication network, the MM module initiates a registration request from the second communication network to the first communication network to the network side (first communication network), and receives the second registration information sent by the network side. If the second registration information includes that there is no N26 interface between the first access management network element and the second access management network element, the SM module directly initiates a PDU session switching process to the network side (first communication network) based on the PDU session state, thereby ensuring that the PDP context of the terminal and the network remains consistent, thereby improving business continuity.

[0080] Furthermore, in an embodiment of the present application, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, during the return process from the second communication network to the first communication network, the MM module receives the third registration information sent by the network side; wherein the third registration information includes the PDU session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module processes the PDP context corresponding to the first communication network based on the PDU session status.

[0081] It should be noted that, in the embodiments of this application, Figure 12 Schematic diagram of the network registration method proposed in this application embodiment Figure 9 ,like Figure 12As shown, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, if there is no interaction with the second communication network, when the MM module initiates a registration request from the second communication network to the first communication network to the network side (the first communication network), the MM module sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module; in response to the pdp context query signaling, the SM module sends a pdp context (MM_SM_PDP_CONTEXT_QUREY_CNF) corresponding to the first communication network to the MM module; the MM module generates a second registration request based on the pdp context corresponding to the first communication network, and sends the second registration request (REGISTRATION QUERY) to the network side (the first communication network). REQUEST), the MM module can receive the third registration information sent by the network side; wherein the third registration information includes the PDU session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module processes the pdp context corresponding to the first communication network based on the PDU session status, where AS represents the access layer (Access Stratum) and NET represents the network side.

[0082] That is to say, in the embodiment of the present application, the SM module and the MM module can initiate different registration types based on whether there is interaction with the network and whether there is an N26 interface during the switching process, thereby reducing the failure of IRAT switching, enabling business continuity, and thus improving user experience.

[0083] The embodiment of the present application provides a network registration method, which is applied to a communication system, wherein the communication system includes an SM module and an MM module, and the method includes: if the switching result from the first communication network to the second communication network is a switching failure, then based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network to the first communication network. It can be seen that if the switch from the first communication network to the second communication network fails, the SM module and the MM module can first initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network. That is to say, after the switching fails, the SM module and the MM module can use different methods to initiate a registration request to the first communication network according to different situations of whether there is interaction with the network side, so as to successfully return from the second communication network to the first communication network, thereby minimizing the situation of registration failure and reducing the waste of air interface resources.

[0084] Based on the above embodiment, another embodiment of the present application provides a network registration method. This method addresses the current technical defects. First, the failure process of IRAT registration can be classified into the following types: the first type is a failure with a network response, and the second type is a failure without a network response; secondly, the UE initiates the appropriate registration type based on the type of registration failure, the type of IRAT, and whether N26 is present. The specific implementation is as follows.

[0085] It should be noted that in the embodiment of the present application, the failure of the registration process is as follows: receiving a specific rejection reason from the network, or not receiving a rejection reason, link establishment rejection, or connection release, etc. According to the actual situation, we divide it into whether there is a standard for interaction with the network side. SM and MM respectively perform PDPContext mapped in the IRAT process and MM registration type according to the standard of the last interaction with the network side.

[0086] The following uses the scenario where 4G->5G->4G and IRAT to 5G fail as an example to further explain the network registration method.

[0087] It should be noted that in an embodiment of the present application, if there is interaction with the second communication network, when the SM module and the MM module initiate a registration request from the second communication network to the first communication network, the MM module can send a pdp context query signaling to the SM module; in response to the pdp context query signaling, the SM module can send the pdp context corresponding to the second communication network to the MM module; the MM module can generate a first registration request based on the pdp context corresponding to the second communication network, and send the first registration request to the first communication network.

[0088] It should be noted that in an embodiment of the present application, if there is interaction with the second communication network, it means that the user has resided in the second communication network. After the MM module sends the pdp context query signaling to the SM module, due to the interaction with the second communication network, the SM module can send the pdp context corresponding to the second communication network to the MM module, so that the MM module can generate a first registration request based on the pdp context corresponding to the second communication network, and thus can send the first registration request to the network side, that is, the first communication network.

[0089] Furthermore, in an embodiment of the present application, the first registration request may include information such as a security context corresponding to the second communication network, a globally unique temporary UE identity (GUTI), and a key set identifier (KSI).

[0090] It should be noted that in an embodiment of the present application, if there is no interaction with the second communication network, when the SM module and the MM module initiate a registration request from the second communication network to the first communication network, the MM module can send a pdp context query signaling to the SM module; in response to the pdp context query signaling, the SM module can send the pdp context corresponding to the first communication network to the MM module; the MM module can generate a second registration request based on the pdp context corresponding to the first communication network, and send the second registration request to the first communication network.

[0091] It should be noted that in an embodiment of the present application, if there is no interaction with the second communication network, it means that the user has not resided in the second communication network. After the MM module sends the pdp context query signaling to the SM module, since there is no interaction with the second communication network, the SM module can send the pdp context corresponding to the first communication network to the MM module, so that the MM module can generate a second registration request based on the pdp context corresponding to the first communication network, and thus can send the second registration request to the network side (first communication network).

[0092] It should be noted that, in the embodiment of the present application, the second registration request may include the security context, GUTI and KSI corresponding to the first communication network.

[0093] It should be noted that, in the embodiments of this application, Figure 13 Schematic diagram of the network registration method proposed in this application embodiment Figure 10 ,like Figure 13As shown, case 1 (case 1): Assume that the first communication network is 4G and the second communication network is 5G. The current terminal device successfully resides in 4G. The MM module receives the switching signaling from 4G to 5G and sends a pdp context query signaling to the SM module. The SM module responds to the pdp context query signaling and sends a pdp context mapped from 4G to 5G. The MM module initiates a registration request based on the pdp context mapped from 4G to 5G (the first pdp context). If the registration of the second communication network, i.e., 5G, fails and there is interaction with 5G, then the MM module When initiating a registration request from 5G back to 4G to the network side (4G), the MM module may send a pdp context query signaling to the SM module again; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to 5G to the MM module; the MM module generates a first registration request based on the pdp context corresponding to 5G, and sends the first registration request to the network side (4G), the first registration request including the security context, GUTI and KSI corresponding to 5G, and the first registration request may refer to the MM module initiating a tracking area update (Tacking Area Update, TAU) request; Case 2 (case 2): If the registration of the second communication network, i.e., 5G, fails and there is no interaction with 5G, then when the MM module initiates a registration request from 5G to 4G to the network side, the MM module may send a pdp context query signaling to the SM module again; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to 4G to the MM module; the MM module generates a second registration request based on the pdp context corresponding to 4G, and sends the second registration request to the network side, the second registration request including the security context, GUTI and KSI corresponding to 4G, and the second registration request may refer to the MM module initiating a tracking area update (TAU) request.

[0094] That is to say, in this application, the registration request initiated by the MM module is different depending on whether there is interaction with the network side. If there is interaction with the network side, the registration request includes the security context, GUTI and KSI corresponding to the second communication network; if there is no interaction with the network side, the registration request includes the security context, GUTI and KSI corresponding to the first communication network; by classifying the registration requests, the reception success rate of the network side is improved, thereby minimizing the number of registration failures and reducing the waste of air interface resources.

[0095] Furthermore, in the embodiments of the present application, Figure 14 Schematic diagram of the network registration method proposed in this application embodiment Figure 10 One, such as Figure 14As shown, when the first communication network is 4G, the second communication network is 5G, and there is an N26 interface between the first access management network element of the first communication network and the second access management network element of the second communication network, during the switching process from the first communication network to the second communication network, the MM module receives the first registration information (REGISTRATIONACCEPT) sent by the network side; wherein the first registration information includes the protocol data unit (PDU) session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session status, and the third PDP context may refer to the PDP context mapped from 4G to 5G.

[0096] It should be noted that in an embodiment of the present application, if the second registration information includes that there is no N26 interface between the first access management network element and the second access management network element, then the SM module directly initiates the PDU session switching process to the network side based on the PDU session status, thereby ensuring that the PDP context of the terminal and the network remains consistent, thereby improving business continuity.

[0097] Furthermore, in an embodiment of the present application, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, in the return process from the second communication network to the first communication network, the MM module receives the second registration information sent by the network side; wherein the second registration information includes the PDU session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session status.

[0098] Furthermore, in an embodiment of the present application, when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, during the return process from the second communication network to the first communication network, the MM module receives the third registration information sent by the network side; wherein the third registration information includes the PDU session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module processes the PDP context corresponding to the first communication network based on the PDU session status.

[0099] It should be noted that, in the embodiments of this application, Figure 15 Schematic diagram of the network registration method proposed in this application embodiment Figure 10 Second, such as Figure 15As shown, case 1 (case 1): when the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, if there is interaction with the second communication network, when the MM module initiates a registration request from the second communication network to the first communication network to the network side (the first communication network), the MM module sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module; in response to the pdp context query signaling, the SM module sends a pdp context (MM_SM_PDP_CONTEXT_QUREY_CNF) corresponding to the second communication network to the MM module; the MM module generates a first registration request based on the pdp context corresponding to the second communication network, and sends the first registration request (REGISTRATION REQUEST) to the network side (the first communication network), and the MM module can receive the second registration information (REGISTRATION REQUEST) sent by the network side. ACCEPT); wherein, the second registration information includes a PDU session status and an N26 interface parameter; the MM module sends the PDU session status and the N26 interface parameter to the SM module; if the N26 interface parameter indicates that there is no N26 interface between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session status, where AS represents the access layer (Access Stratum) and NET represents the network side. Case 2: When the first communication network is 5G, the second communication network is 4G, and there is an N26 interface between the first access management network element and the second access management network element, if there is no interaction with the second communication network, when the MM module initiates a registration request from the second communication network to the first communication network to the network side, the MM module sends a pdp context query signaling (MM_SM_PDP_CONTEXT_QUREY_REQ) to the SM module; in response to the pdp context query signaling, the SM module sends the pdp context corresponding to the first communication network (MM_SM_PDP_CONTEXT_QUREY_CNF) to the MM module; the MM module generates a second registration request based on the pdp context corresponding to the first communication network, and sends the second registration request to the network side. REQUEST), the MM module can receive the third registration information sent by the network side; wherein the third registration information includes the PDU session status and the N26 interface parameters; the MM module sends the PDU session status and the N26 interface parameters to the SM module; if the N26 interface parameters indicate that there is no N26 interface between the first access management network element and the second access management network element, the SM module processes the pdp context corresponding to the first communication network based on the PDU session status, where AS represents the access layer (Access Stratum) and NET represents the network side.

[0100] That is to say, in an embodiment of the present application, different registration types can be initiated based on whether there is interaction with the network and whether there is an N26 interface during the switching process, thereby reducing the failure of IRAT switching, enabling business continuity, and improving user experience.

[0101] The embodiment of the present application provides a network registration method, which is applied to a communication system, wherein the communication system includes an SM module and an MM module, and the method includes: if the switching result from the first communication network to the second communication network is a switching failure, then based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network to the first communication network. It can be seen that if the switch from the first communication network to the second communication network fails, the SM module and the MM module can first initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network. That is to say, after the switching fails, the SM module and the MM module can use different methods to initiate a registration request to the first communication network according to different situations of whether there is interaction with the network side, so as to successfully return from the second communication network to the first communication network, thereby minimizing the situation of registration failure and reducing the waste of air interface resources.

[0102] Based on the above embodiments, the present application provides a communication system. Figure 16 Schematic diagram of the communication system structure Figure 1 ,like Figure 16 As shown, the communication system 10 includes: an initiating unit 11,

[0103] The initiating unit 11 is configured to initiate, if the switching result from the first communication network to the second communication network is a switching failure, the SM module and the MM module to initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network.

[0104] In the embodiments of the present application, further, Figure 17 Schematic diagram of the communication system structure Figure 2 ,like Figure 17 As shown, the communication system 10 proposed in the embodiment of the present application may also include a processor 12, a memory 13 storing executable instructions of the processor 12, and further, the communication system 10 may also include a communication interface 14, and a bus 15 for connecting the processor 12, the memory 13 and the communication interface 14.

[0105] In an embodiment of the present application, the processor 12 may be at least one of an application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a central processing unit (CPU), a controller, a microcontroller, and a microprocessor. It is understandable that for different devices, the electronic device used to implement the functions of the processor may also be other, and the embodiment of the present application does not specifically limit this. The communication system 10 may further include a memory 13, which may be connected to the processor 12, wherein the memory 13 is used to store executable program code, the program code including computer operating instructions, and the memory 13 may include a high-speed RAM memory, and may also include a non-volatile memory, for example, at least two disk memories.

[0106] In the embodiment of the present application, the bus 15 is used to connect the communication interface 14, the processor 12 and the memory 13, and to facilitate mutual communication between these devices.

[0107] In the embodiment of the present application, the memory 13 is used to store instructions and data.

[0108] Furthermore, in an embodiment of the present application, the above-mentioned processor 12 is used to initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network if the switching result from the first communication network to the second communication network is a switching failure. The SM module and the MM module initiate a registration request from the second communication network to the first communication network.

[0109] In practical applications, the memory 13 may be a volatile memory, such as a random-access memory (RAM); or a non-volatile memory, such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD) or a solid-state drive (SSD); or a combination of the above types of memory, and provide instructions and data to the processor 12.

[0110] An embodiment of the present application provides a communication system, which includes an SM module and an MM module. If the switching result from the first communication network to the second communication network is a switching failure, the SM module and the MM module initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network. It can be seen that if the switch from the first communication network to the second communication network fails, the SM module and the MM module can first initiate a registration request from the second communication network to the first communication network based on whether there is interaction with the second communication network. That is to say, after the switching fails, the SM module and the MM module can use different methods to initiate a registration request to the first communication network according to different situations of whether there is interaction with the network side, so as to successfully return from the second communication network to the first communication network, thereby minimizing the situation of registration failure and reducing the waste of air interface resources.

[0111] An embodiment of the present application provides a computer-readable storage medium having a program stored thereon, which implements the network registration method described above when executed by a processor.

[0112] Specifically, the program instructions corresponding to a network registration method in this embodiment can be stored on a storage medium such as a CD, a hard disk, or a USB flash drive. When the program instructions corresponding to a network registration method in the storage medium are read or executed by an electronic device, the following steps are included:

[0113] If the switching result from the first communication network to the second communication network is a switching failure, based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request to the first communication network to return from the second communication network to the first communication network.

[0114] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of hardware embodiments, software embodiments, or embodiments combining software and hardware. Furthermore, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0115] The present application is described with reference to the implementation flow charts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flow charts and / or block diagrams, as well as the combination of processes and / or boxes in the flow charts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the implementation flow charts. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0116] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which is implemented in the implementation flow diagram. Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process described in the flowchart. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0118] The above description is merely a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application.

Claims

1. A network registration method, characterized in that: The method is applied to a communication system including a session management (SM) module and a mobility management (MM) module, and includes: If the switching result from the first communication network to the second communication network is a switching failure, based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request to the first communication network to return from the second communication network to the first communication network; Wherein, based on whether there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network, including: If there is no interaction with the second communication network, the MM module sends a packet data protocol (PDP) context query signaling to the SM module; in response to the PDP context query signaling, the SM module sends a PDP context corresponding to the first communication network to the MM module; The MM module generates a second registration request based on the pdp context corresponding to the first communication network, and sends the second registration request to the first communication network.

2. The method according to claim 1, characterized in that If there is interaction with the second communication network, the SM module and the MM module initiate a registration request from the second communication network to the first communication network, including: The MM module sends a pdp context query signaling to the SM module; In response to the PDP context query signaling, the SM module sends the PDP context corresponding to the second communication network to the MM module; The MM module generates a first registration request based on the pdp context corresponding to the second communication network, and sends the first registration request to the first communication network.

3. The method according to claim 2, characterized in that The first registration request includes the security context corresponding to the second communication network, a globally unique temporary UE identity GUTI, and a key set identifier KSI.

4. The method according to claim 1, wherein The second registration request includes the security context, GUTI, and KSI corresponding to the first communication network.

5. The method according to any one of claims 1 to 3, characterized in that The first communication network is the fourth generation mobile communication technology 4G, and the second communication network is the fifth generation mobile communication technology 5G; or The first communication network is 5G, and the second communication network is 4G.

6. The method according to claim 5, characterized in that When the first communication network is 4G, the second communication network is 5G, and an N26 interface exists between a first access management network element of the first communication network and a second access management network element of the second communication network, the method further includes: During the switching process from the first communication network to the second communication network, the MM module receives first registration information sent by the network side; wherein the first registration information includes a protocol data unit PDU session state and N26 interface parameters; The MM module sends the PDU session status and the N26 interface parameters to the SM module; If the N26 interface parameter indicates that no N26 interface exists between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session state.

7. The method according to claim 2 or 3, characterized in that When the first communication network is 5G, the second communication network is 4G, and an N26 interface exists between the first access management network element and the second access management network element, the method further includes: During the return process from the second communication network to the first communication network, the MM module receives second registration information sent by the network side; wherein the second registration information includes the PDU session state and the N26 interface parameters; The MM module sends the PDU session status and the N26 interface parameters to the SM module; If the N26 interface parameter indicates that no N26 interface exists between the first access management network element and the second access management network element, the SM module initiates a PDU session switching process based on the PDU session state.

8. The method according to claim 1 or 4, characterized in that When the first communication network is 5G, the second communication network is 4G, and an N26 interface exists between the first access management network element and the second access management network element, the method further includes: During the return process from the second communication network to the first communication network, the MM module receives third registration information sent by the network side; wherein the third registration information includes the PDU session state and the N26 interface parameters; The MM module sends the PDU session status and the N26 interface parameters to the SM module; If the N26 interface parameter indicates that there is no N26 interface between the first access management network element and the second access management network element, the SM module processes the pdp context corresponding to the first communication network based on the PDU session state.

9. A communication system, characterized in that: The communication system includes: an initiating unit, The initiating unit is configured to, if the switching result from the first communication network to the second communication network is a switching failure, and if there is no interaction with the second communication network, cause the MM module to send PDP context query signaling to the SM module; in response to the PDP context query signaling, cause the SM module to send the PDP context corresponding to the first communication network to the MM module; and cause the MM module to generate a second registration request based on the PDP context corresponding to the first communication network, and send the second registration request to the first communication network.

10. A communication system, characterized in that: The communication system includes a session management SM module and a mobility management MM module, The SM module and the MM module are configured to send a PDP context query signaling to the SM module if a handover result from the first communication network to the second communication network is a handover failure and if there is no interaction with the second communication network; In response to the PDP context query signaling, the SM module sends the PDP context corresponding to the first communication network to the MM module; The MM module generates a second registration request based on the pdp context corresponding to the first communication network, and sends the second registration request to the first communication network.

11. A communication system, characterized in that: The communication system includes: a processor and a memory; wherein, The memory is used to store a computer program that can be run on the processor; The processor is configured to execute the method according to any one of claims 1 to 8 when running the computer program.

12. A computer-readable storage medium, characterized in that The storage medium stores computer program code, which, when executed by a computer, executes the method according to any one of claims 1 to 8.

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