CN109548097B

CN109548097B - Bearer establishment method and device

Info

Publication number: CN109548097B
Application number: CN201710693591.9A
Authority: CN
Inventors: 金辉; 欧阳国威; 窦凤辉; 杨皓睿; 李小娟
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2017-08-14
Filing date: 2017-08-14
Publication date: 2021-01-12
Anticipated expiration: 2037-08-14
Also published as: WO2019033532A1; CN109548097A

Abstract

The application provides a bearer establishment method and a bearer establishment device, relates to the technical field of communication, and is used for ensuring that the address of UE is unchanged and saving transmission resources when the UE moves from a first communication system to a second communication system. The method comprises the following steps: when UE moves from a first communication system to a second communication system, first core network equipment receives a first request sent by second core network equipment, wherein the first request is used for acquiring EPS bearing information of the UE corresponding to the second communication system in a PDU session of the first communication system; when determining that the PDU session is deactivated, the first core network equipment sends information of a default EPS bearer corresponding to the PDU session to the second core network equipment; the UE moving from a first communication system to a second communication system; and when the PDU conversation is in a deactivated state, the UE establishes a default EPS bearing corresponding to the PDU conversation in the second communication system.

Description

Bearer establishment method and device

Technical Field

The embodiment of the application relates to the technical field of communication, in particular to a bearer establishment method and device.

Background

With the rapid development of communication technologies, a variety of User Equipment (UE) devices such as smart phones, tablet computers, and portable devices have appeared, and these UE devices can simultaneously support different generations of mobile communication networks and can switch between different generations of mobile communication networks. For example, the UE can move from a fifth Generation (5G) communication network to a fourth Generation (4G) communication network, and the 5G network is an extension of the 4G network, and has the characteristics of high performance, low delay, high capacity, and the like, and the highest data transmission speed can reach tens of Gbps or more.

Currently, a PDU session established on a UE and not currently used in a 5G network may be deactivated (deactivating), that is, context information of the PDU session not used is retained, where the context information includes an IP address of the UE, and a data transmission channel of the PDU session is released, where the data transmission channel includes channels between the UE and a 5G base station and between the 5G base station and a User Plane Function (UPF). When the UE moves from the 5G network to the 4G network, the PDU session of the UE is transferred to the (Move to)4G network. If all PDU sessions on the UE are transferred to the 4G network, the PDU sessions currently not used on the UE are also activated in the 4G network, so that corresponding transmission resources need to be allocated to the PDU sessions, which results in resource waste. If only the PDU session in Active state (Active) on the UE is transferred, the IP address of the UE is released, thereby affecting the user experience.

Disclosure of Invention

Embodiments of the present invention provide a bearer establishment method and apparatus, which solve the problem in the prior art that a PDU session in which a UE is in an inactive state in a first communication system is activated due to moving to a second communication system, resulting in a waste of transmission resources, or that only a PDU session in which a UE is in an active state in a first communication system is moved to a second communication system, resulting in a release of an IP address of the UE, and improve user experience.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, a bearer establishment method is provided, where the method includes: the UE moves from a first communication system to a second communication system, for example, the UE moves from a 5G communication system to a 4G communication system; when the PDU conversation of the UE in the first communication system is in a deactivation state, the UE establishes a default EPS bearing corresponding to the PDU conversation in the second communication system. In the above technical solution, in the process that the UE moves from the first communication system to the second communication system, when the PDU session of the UE in the first communication system is in a deactivated state, the UE only establishes the default EPS bearer corresponding to the PDU session in the second communication system, thereby avoiding the problem that the deactivated PDU session is reactivated in the process that the UE moves, saving transmission resources, and simultaneously ensuring that the IP address of the UE is not released, thereby improving user experience.

In a possible implementation manner of the first aspect, the moving the UE from the first communication system to the second communication system includes: the UE sends a tracking area updating message to core network equipment of the second communication system, wherein the tracking area updating message comprises an EPS bearing state, a default EPS bearing of the PDU session corresponding to the second communication system in the EPS bearing state is marked to be activated, and a special EPS bearing of the PDU session corresponding to the second communication system is marked to be deactivated. In the possible implementation manner, the UE may move from the first communication system to the second communication system through the tracking area update message, and only establish the default EPS bearer corresponding to the PDU session in the second communication system, so that it is ensured that the IP address of the UE is not released, and at the same time, the deactivated PDU session is prevented from being activated due to the movement of the UE.

In a possible implementation manner of the first aspect, the establishing, by the UE, a default EPS bearer corresponding to the PDU session in the second communication system includes: and the UE deletes the special EPS bearing corresponding to the PDU conversation of the second communication system, and/or deletes the QoS flow corresponding to the special EPS bearing in the PDU conversation. In the foregoing possible implementation manner, the UE may ensure that the UE establishes the default EPS bearer corresponding to the PDU session only in the second communication system by deleting the dedicated EPS bearer and/or deleting the QoS flow corresponding to the dedicated EPS bearer.

In a possible implementation manner of the first aspect, before the UE moves from the first communication system to the second communication system, the method further includes: and when the PDU session is deactivated, the UE sets the first bearer identification EBI of the dedicated EPS bearer corresponding to the second communication system as unavailable. In the foregoing possible implementation manner, when the PDU session of the UE in the first communication system is in a deactivated state, the UE may set the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable, so that a problem that the EBI of the EPS bearer of the UE is not enough when the UE moves from the first communication system to the second communication system may be avoided.

In a possible implementation manner of the first aspect, the setting, by the UE, the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable includes: the UE deletes the first EBI of the special EPS bearer; or, the UE deactivates the first EBI of the dedicated EPS bearer. In the foregoing possible implementation manner, the UE may disable the first EBI by deleting the first EBI or deactivating the first EBI.

In a possible implementation manner of the first aspect, the deleting, by the UE, the first EBI of the dedicated EPS bearer includes: the UE deletes the first context, wherein the first context comprises a first EBI, and the first context is the context of the special EPS bearer; or the UE deactivates the first context and deletes the first EBI in the first context, where the first context is the context of the dedicated EPS bearer. In the foregoing possible implementation manners, two manners of deleting the first EBI by the UE are provided, that is, the first EBI may be deleted by deleting the first context, or the UE deletes the first EBI by deactivating the first context and deleting the first EBI in the first context.

In a possible implementation manner of the first aspect, the deactivating, by the UE, the first EBI of the dedicated EPS bearer includes: the UE deactivates a first context, the first context includes a first EBI, and the first context is the context of the dedicated EPS bearer. In the foregoing possible implementation manner, a manner for the UE to deactivate the first EBI is provided, that is, the first EBI may be deactivated by deactivating the first context.

In a possible implementation manner of the first aspect, when the UE deletes the first context, where the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a first message sent by a first core network device of a first communication system, wherein the first message comprises a second context, and the second context is the context of the special EPS bearer; the UE allocates a second EBI for the special EPS bearing corresponding to the second context; the UE sends the second EBI to the first core network device. In the foregoing possible implementation manner, when the PDU session is activated, the UE may reallocate the second EBI for the dedicated EPS bearer of the second communication system corresponding to the PDU session, so as to solve the problem that the EBI of the UE is insufficient, and ensure that the PDU session is performed normally.

In a possible implementation manner of the first aspect, when the UE deactivates the first context and deletes the first EBI in the first context, the method further includes: when the PDU conversation is activated, the UE receives a second message sent by first core network equipment of a first communication system, wherein the second message comprises an identifier QFI set of QoS flow of the PDU conversation, and the QFI set corresponds to a special EPS bearing; the UE allocates a second EBI for the special EPS bearing corresponding to the QFI set; the UE sends the second EBI to the first core network device. Further, when the PDU session is activated, the method may further include: and the UE sets the first context to be in an activated state, or sends the corresponding relation between the QFI set and the second EBI to the first core network equipment. In the foregoing possible implementation manner, when the PDU session is activated, the UE may reallocate the second EBI for the dedicated EPS bearer of the second communication system corresponding to the PDU session, so as to solve the problem that the EBI of the UE is insufficient, and ensure that the PDU session is performed normally.

In a possible implementation manner of the first aspect, when the UE deactivates the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a third message sent by a first core network device of the first communication system, wherein the third message comprises a first EBI; the UE allocates a second EBI for the special EPS bearing corresponding to the first EBI; and the UE sends the second EBI to the first core network equipment, or sends the corresponding relation between the first EBI and the second EBI to the first core network equipment. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state. In the foregoing possible implementation manner, when the PDU session is activated, the UE may reallocate the second EBI for the dedicated EPS bearer of the second communication system corresponding to the PDU session, so as to solve the problem that the EBI of the UE is insufficient, and ensure that the PDU session is performed normally.

In a possible implementation manner of the first aspect, when the UE deactivates the first context and deletes the first EBI in the first context, the method further includes: when the PDU session is activated, the UE receives a fourth message sent by a first core network device of the first communication system, where the fourth message includes a correspondence between a QFI set of a QoS flow of the PDU session and a second EBI, the QFI set corresponds to the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer; the UE determines a correspondence of the second EBI to the first context. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state. In the foregoing possible implementation manner, when the PDU session is activated, the core network device may reallocate the second EBI to the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the UE, so that the problem that the EBI of the UE is insufficient can be solved, and meanwhile, the PDU session is guaranteed to be performed normally.

In a possible implementation manner of the first aspect, when the UE deactivates the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a fifth message sent by a first core network device of the first communication system, where the fifth message includes a correspondence between the first EBI and a second EBI, and the second EBI is an EBI allocated to the dedicated EPS bearer; the UE determines a correspondence of the second EBI to the first context. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state. In the foregoing possible implementation manner, when the PDU session is activated, the core network device in the first communication system may reallocate the second EBI for the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the UE, so as to solve the problem that the EBI of the UE is insufficient, and ensure that the PDU session is performed normally.

In a possible implementation manner of the first aspect, when the UE deletes the first context, where the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a sixth message sent by a first core network device of the first communication system, where the sixth message includes a second context and a second EBI, the second context is a context of the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer; the UE determines a correspondence of the second EBI to the second context. In the foregoing possible implementation manner, when the PDU session is activated, the core network device in the first communication system may reallocate the second EBI for the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the UE, so as to solve the problem that the EBI of the UE is insufficient, and ensure that the PDU session is performed normally.

In a second aspect, a bearer establishment method is provided, where the method includes: when User Equipment (UE) moves from a first communication system to a second communication system, first core network equipment receives a first request sent by second core network equipment, wherein the first request is used for acquiring EPS (evolved packet System) bearing information of the UE corresponding to the second communication system in a PDU (protocol data Unit) session of the first communication system; the first communication system comprises a first core network device and a second core network device; and when the first core network equipment determines that the PDU session is deactivated, the first core network equipment sends the information of the default EPS bearer of the second communication system corresponding to the PDU session to the second core network equipment. For example, the first communication system is a 5G communication system, the second communication system is a 4G communication system, the first core network device is an SMF, the second core network device is an AMF, and the first request is a service request. In the above technical solution, in the process of moving the UE from the first communication system to the second communication system, when the PDU session of the UE in the first communication system is in a deactivated state, the default EPS bearer corresponding to the PDU session is established only in the second communication system for the UE, so that the problem that the deactivated PDU session is reactivated in the process of moving the UE is avoided, transmission resources are saved, and meanwhile, it is also ensured that the IP address of the UE is not released, thereby improving user experience.

In a possible implementation manner of the second aspect, before the first core network device determines that the PDU session is deactivated, the method further includes: and the first core network equipment sets the first bearer identification EBI of the special EPS bearer corresponding to the PDU session in the second communication system as unavailable. In the foregoing possible implementation manner, when the PDU session of the UE in the first communication system is in a deactivated state, the first core network device may set the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable, so that a problem that the EBI of the EPS bearer of the UE is not enough when the UE moves from the first communication system to the second communication system may be avoided.

In a possible implementation manner of the second aspect, the setting, by the first core network device, the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable includes: the first core network equipment deletes the first EBI of the special EPS bearer; or the first core network device deactivates the first EBI of the dedicated EPS bearer. In the foregoing possible implementation manner, the first core network device may disable the first EBI by deleting the first EBI or deactivating the first EBI.

In a possible implementation manner of the second aspect, the deleting, by the first core network device, the first EBI of the dedicated EPS bearer includes: the first core network equipment deletes the first context, wherein the first context comprises a first EBI (enhanced broadcast information infrastructure), and the first context is the context of the special EPS bearer; or the first core network device deactivates the first context and deletes the first EBI in the first context, where the first context is the context of the dedicated EPS bearer. In the foregoing possible implementation manners, two manners of deleting the first EBI by the first core network device are provided, that is, the first EBI may be deleted by deleting the first context, or the UE deletes the first EBI by deactivating the first context and deleting the first EBI in the first context.

In a possible implementation manner of the second aspect, the deactivating, by the first core network device, the first EBI of the dedicated EPS bearer includes: the first core network device deactivates the first context, the first context includes the first EBI, and the first context is the context of the dedicated EPS bearer. In the foregoing possible implementation manner, a manner is provided for the first core network device to deactivate the first EBI, that is, the first EBI may be deactivated by deactivating the first context.

In a possible implementation manner of the second aspect, when the first core network device deletes the first context, and the first context includes the first EBI, the method further includes: when the PDU conversation is activated, the first core network equipment determines a second context, and the second context is the context of the special EPS bearing; the first core network equipment sends a first message to the UE, wherein the first message comprises a second context; the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is an EBI of a special EPS bearer corresponding to a second context; the first core network device determines a correspondence between the second context and the second EBI. In the foregoing possible implementation manner, when the PDU session is activated, the UE may re-allocate the second EBI to the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the first core network device, so that the problem that the EBI of the UE is insufficient can be solved, and meanwhile, the PDU session is guaranteed to be performed normally.

In a possible implementation manner of the second aspect, when the first core network device deactivates the first context and deletes the first EBI in the first context, the method further includes: when the PDU session is activated, the first core network equipment sends a second message to the UE, wherein the second message comprises an identifier QFI set of QoS flow, and the QFI set corresponds to the special EPS bearing; the first core network equipment receives a second EBI sent by the UE, or receives the corresponding relation between the QFI set and the second EBI sent by the UE, wherein the second EBI is the EBI allocated to the EPS bearer; the first core network device determines a correspondence between the first context and the second EBI. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state. In the foregoing possible implementation manner, when the PDU session is activated, the UE may re-allocate the second EBI to the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the first core network device, so that the problem that the EBI of the UE is insufficient can be solved, and meanwhile, the PDU session is guaranteed to be performed normally.

In a possible implementation manner of the second aspect, when the first core network device deactivates the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the first core network equipment sends a third message to the UE, wherein the third message comprises the first EBI; the first core network equipment receives a second EBI sent by the UE, or receives the corresponding relation between the first EBI and the second EBI, wherein the second EBI is the EBI allocated to the special EPS bearing; the first core network device determines a correspondence between the first context and the second EBI. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state. In the foregoing possible implementation manner, when the PDU session is activated, the UE may re-allocate the second EBI to the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the first core network device, so that the problem that the EBI of the UE is insufficient can be solved, and meanwhile, the PDU session is guaranteed to be performed normally.

In one possible implementation manner of the second aspect, the method further includes: when the PDU session is activated, the first core network equipment sends a second request to the second core network equipment, wherein the second request is used for requesting to allocate a second EBI for the special EPS bearing; the first core network equipment receives a second EBI sent by the second core network equipment; the first core network device determines a correspondence between the context of the dedicated EPS bearer and the second EBI, for example, stores the second EBI in the context of the dedicated EPS bearer. In the foregoing possible implementation manner, when the PDU session is activated, the second core network device may reallocate the second EBI to the dedicated EPS bearer of the second communication system corresponding to the PDU session, and send the second EBI to the first core network device, so that the problem that the EBI of the UE is insufficient can be solved, and meanwhile, the PDU session is guaranteed to be performed normally.

In a possible implementation manner of the second aspect, when the first core network device deactivates the first context and deletes the first EBI in the first context, and after the first core network device receives the second EBI sent by the second core network device, the method further includes: and the first core network equipment sends a fourth message to the UE, wherein the fourth message comprises the corresponding relation between the QFI set and the second EBI, and the QFI set corresponds to the special EPS bearer. Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI means determining the corresponding relationship between the first context and the second EBI, for example, storing the second EBI in the first context. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state. In the foregoing possible implementation manner, after the first core network device receives the second EBI and the second EBI, the corresponding relationship between the QFI set and the second EBI may be sent to the UE, so that the problem that the EBI of the UE is insufficient may be solved, and the PDU session is guaranteed to be performed normally.

In a possible implementation manner of the second aspect, when the first core network device deactivates the first context and the first context includes the first EBI, after the first core network device receives the second EBI sent by the second core network device, the method further includes: and the first core network equipment sends a fifth message to the UE, wherein the fifth message comprises the corresponding relation between the first EBI and the second EBI. Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI means determining the corresponding relationship between the first context and the second EBI, for example, storing the second EBI in the first context. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state. In the foregoing possible implementation manner, after the first core network device receives the second EBI and the second EBI, the first core network device may send the correspondence between the first EBI set and the second EBI to the UE, so that the problem that the EBI of the UE is insufficient may be solved, and the PDU session is guaranteed to be performed normally.

In a possible implementation manner of the second aspect, when the first core network device deletes the first context, and the first context includes the first EBI, the method further includes: the first core network equipment determines a second context, wherein the second context is the context of the special EPS bearing; the first core network device sends a sixth message to the UE, the sixth message including the second context and the second EBI. Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI means determining the corresponding relationship between the second context and the second EBI, for example, storing the second EBI in the first context. In the foregoing possible implementation manner, after the first core network device receives the second EBI and the second EBI, the second core network device may send the second context and the second EBI to the UE, so that the problem that the EBI of the UE is insufficient may be solved, and the PDU session is guaranteed to be performed normally.

In a third aspect, a bearer identity management method is provided, where the method includes: when the PDU session of the user equipment UE in the first communication system is deactivated, the UE sets the first bearer identification EBI of the special EPS bearer corresponding to the second communication system in the PDU session as unavailable. In the above technical solution, when the PDU session in the first communication system is in a deactivated state, the UE may set the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable, so as to avoid a problem that the EBI of the EPS bearer of the UE is not enough when the UE moves from the first communication system to the second communication system, thereby improving user experience.

In a possible implementation manner of the third aspect, the setting, by the UE, that the PDU session corresponds to a first EBI of a dedicated EPS bearer of the second communication system as unavailable includes: the UE deletes the first EBI of the special EPS bearer; or, the UE deactivates the first EBI of the dedicated EPS bearer.

In a possible implementation manner of the third aspect, the deleting, by the UE, the first EBI of the dedicated EPS bearer includes: the UE deletes the first context, wherein the first context comprises a first EBI, and the first context is the context of the special EPS bearer; or the UE deactivates the first context and deletes the first EBI in the first context, where the first context is the context of the dedicated EPS bearer.

In a possible implementation manner of the third aspect, the deactivating, by the UE, the first EBI of the dedicated EPS bearer includes: the UE deactivates a first context, the first context includes a first EBI, and the first context is the context of the dedicated EPS bearer.

In a possible implementation manner of the third aspect, when the UE deletes the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a first message sent by a first core network device of a first communication system, wherein the first message comprises a second context, and the second context is the context of the special EPS bearer; the UE allocates a second EBI for the special EPS bearing corresponding to the second context; the UE sends the second EBI to the first core network device.

In a possible implementation manner of the third aspect, when the UE deactivates the first context and deletes the first EBI in the first context, the method further includes: when the PDU conversation is activated, the UE receives a second message sent by first core network equipment of a first communication system, wherein the second message comprises an identifier QFI set of QoS flow of the PDU conversation, and the QFI set corresponds to a special EPS bearing; the UE allocates a second EBI for the special EPS bearing corresponding to the QFI set; the UE sends the second EBI to the first core network device. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state.

In a possible implementation manner of the third aspect, when the UE deactivates the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a third message sent by a first core network device of the first communication system, wherein the third message comprises a first EBI; the UE allocates a second EBI for the special EPS bearing corresponding to the first EBI; the UE sends the second EBI to the first core network device. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state.

In a possible implementation manner of the third aspect, when the UE deactivates the first context and deletes the first EBI in the first context, the method further includes: when the PDU session is activated, the UE receives a fourth message sent by a first core network device of the first communication system, where the fourth message includes a correspondence between a QFI set of a QoS flow of the PDU session and a second EBI, the QFI set corresponds to the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer; the UE determines a correspondence between the second EBI and the first context, for example, stores the second EBI in the first context. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state.

In a possible implementation manner of the third aspect, when the UE deactivates the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a fifth message sent by a first core network device of the first communication system, where the fifth message includes a correspondence between the first EBI and a second EBI, and the second EBI is an EBI allocated to the dedicated EPS bearer; the UE determines a correspondence between the second EBI and the first context, for example, stores the second EBI in the first context. Further, when the PDU session is activated, the method may further include: the UE sets the first context to an active state.

In a possible implementation manner of the third aspect, when the UE deletes the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the UE receives a sixth message sent by a first core network device of the first communication system, where the sixth message includes a second context and a second EBI, the second context is a context of the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer; the UE determines a correspondence of the second EBI to the second context.

In a fourth aspect, a bearer identifier management method is provided, where the method includes: the first core network device sets a first bearer identification (EBI) of a dedicated EPS bearer corresponding to a second communication system in a PDU session of a first communication system of User Equipment (UE) as unavailable. In the above technical solution, when the PDU session of the UE in the first communication system is in a deactivated state, the first core network device may set the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable, so as to avoid a problem that the EBI of the EPS bearer of the UE is not enough when the UE moves from the first communication system to the second communication system, and improve user experience.

In a possible implementation manner of the fourth aspect, the setting, by the first core network device, the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable includes: the first core network equipment deletes the first EBI of the special EPS bearer; or the first core network device deactivates the first EBI of the dedicated EPS bearer.

In a possible implementation manner of the fourth aspect, the deleting, by the first core network device, the first EBI of the dedicated EPS bearer includes: the first core network equipment deletes the first context, wherein the first context comprises a first EBI (enhanced broadcast information infrastructure), and the first context is the context of the special EPS bearer; or the first core network device deactivates the first context and deletes the first EBI in the first context, where the first context is the context of the dedicated EPS bearer.

In a possible implementation manner of the fourth aspect, the deactivating, by the first core network device, the first EBI of the dedicated EPS bearer includes: the first core network device deactivates the first context, the first context includes the first EBI, and the first context is the context of the dedicated EPS bearer.

In a possible implementation manner of the fourth aspect, when the first core network device deletes the first context, and the first context includes the first EBI, the method further includes: when the PDU conversation is activated, the first core network equipment determines a second context, and the second context is the context of the special EPS bearing; the first core network equipment sends a first message to the UE, wherein the first message comprises a second context; the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is an EBI of a special EPS bearer corresponding to a second context; the first core network device determines a correspondence between the second context and the second EBI, for example, stores the second EBI in the second context.

In a possible implementation manner of the fourth aspect, when the first core network device deactivates the first context and deletes the first EBI in the first context, the method further includes: when the PDU session is activated, the first core network equipment sends a second message to the UE, wherein the second message comprises an identifier QFI set of QoS flow, and the QFI set corresponds to the special EPS bearing; the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is the EBI allocated to the EPS bearer; the first core network device determines a correspondence between the first context and the second EBI, for example, stores the second EBI in the first context. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state.

In a possible implementation manner of the fourth aspect, when the first core network device deactivates the first context, and the first context includes the first EBI, the method further includes: when the PDU session is activated, the first core network equipment sends a third message to the UE, wherein the third message comprises the first EBI; the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is the EBI allocated to the special EPS bearing; the first core network device determines a correspondence between the first context and the second EBI, for example, stores the second EBI in the first context. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state.

In one possible implementation manner of the fourth aspect, the method further includes: when the PDU session is activated, the first core network equipment sends a second request to the second core network equipment, wherein the second request is used for requesting to allocate a second EBI for the special EPS bearing; the first core network equipment receives a second EBI sent by the second core network equipment; and the first core network equipment determines the corresponding relation between the context of the special EPS bearer and the second EBI.

In a possible implementation manner of the fourth aspect, when the first core network device deactivates the first context and deletes the first EBI in the first context, and after the first core network device receives the second EBI sent by the second core network device, the method further includes: and the first core network equipment sends a fourth message to the UE, wherein the fourth message comprises the corresponding relation between the QFI set and the second EBI, and the QFI set corresponds to the special EPS bearer. Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI means determining the corresponding relationship between the first context and the second EBI, for example, storing the second EBI in the first context. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state.

In a possible implementation manner of the fourth aspect, when the first core network device deactivates the first context and the first context includes the first EBI, after the first core network device receives the second EBI sent by the second core network device, the method further includes: and the first core network equipment sends a fifth message to the UE, wherein the fifth message comprises the corresponding relation between the first EBI and the second EBI. Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI means determining the corresponding relationship between the first context and the second EBI, for example, storing the second EBI in the first context. Further, when the PDU session is activated, the method further includes: and the first core network equipment sets the context of the special EPS bearer to be in an activated state.

In a possible implementation manner of the fourth aspect, when the first core network device deletes the first context, and the first context includes the first EBI, the method further includes: the first core network equipment determines a second context, wherein the second context is the context of the special EPS bearing; the first core network device sends a sixth message to the UE, the sixth message including the second context and the second EBI. Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI means determining the corresponding relationship between the second context and the second EBI, for example, storing the second EBI in the second context.

In yet another aspect of the present application, a user equipment UE is provided, where the UE is configured to implement a function in a bearer establishment method provided in any one of the foregoing first aspect or any one of the foregoing possible implementations of the first aspect, or is configured to implement a function in a bearer identity management method provided in any one of the foregoing third aspect or any one of the foregoing possible implementations of the third aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the functions.

In a possible implementation manner, the structure of the user equipment includes a processor and a communication interface, where the processor is configured to support the user equipment to execute the bearer establishment method provided by the first aspect or any one of the possible implementation manners of the first aspect, or the bearer identification management method provided by any one of the possible implementation manners of the third aspect or the third aspect. The user equipment may also include a memory for coupling with the processor that stores program code and data necessary for the user equipment.

In yet another aspect of the present application, a computer-readable storage medium is provided, which has instructions stored therein, and when the instructions are executed on a computer, the instructions cause the computer to perform the bearer establishment method provided in the first aspect or any one of the possible implementations of the first aspect, or perform the bearer identification management method provided in the third aspect or any one of the possible implementations of the third aspect.

In a further aspect of the present application, a computer program product is provided, which contains instructions that, when run on a computer, cause the computer to perform the bearer establishment method provided in the first aspect or any one of the possible implementations of the first aspect, or to perform the bearer identity management method provided in the third aspect or any one of the possible implementations of the third aspect.

In another aspect of the present application, a core network device is provided, where the core network device is a first core network device, and is configured to implement a function in a bearer establishment method provided in any possible implementation manner of the second aspect or the second aspect, or a function in a bearer identifier management method provided in any possible implementation manner of the fourth aspect or the fourth aspect, where the function may be implemented by hardware, or may be implemented by hardware executing corresponding software. The hardware or software comprises one or more units corresponding to the functions.

In a possible implementation manner, the first core network device includes a processor and a communication interface, where the processor is configured to support the user equipment to execute the bearer establishment method provided in any possible implementation manner of the second aspect or the second aspect, or the bearer identification management method provided in any possible implementation manner of the fourth aspect or the fourth aspect. The first core network device may also include a memory, coupled to the processor, that stores necessary program code and data for the first core network device.

In a further aspect of the present application, a computer-readable storage medium is provided, which has instructions stored therein, and when running on a computer, causes the computer to execute the bearer establishment method provided in any one of the above-mentioned second aspect or any one of the above-mentioned possible implementations of the second aspect, or to execute the bearer identification management method provided in any one of the above-mentioned fourth aspect or any one of the above-mentioned possible implementations of the fourth aspect.

In a further aspect of the present application, a computer program product is provided, which contains instructions that, when run on a computer, cause the computer to perform the bearer establishment method provided in any one of the possible implementations of the second aspect or the second aspect described above, or to perform the bearer identification management method provided in any one of the possible implementations of the fourth aspect or the fourth aspect described above.

In yet another aspect of the present application, a communication system is provided, which includes a user equipment and a first core network device; the ue is configured to support the ue to execute a bearer establishment method provided by any one of the foregoing first aspect or any one of the foregoing possible implementations of the first aspect, or execute a bearer identification management method provided by any one of the foregoing third aspect or any one of the foregoing possible implementations of the third aspect; and/or the first core network device is a core network device provided in the foregoing aspects, and is configured to support the first core network device to execute a bearer establishment method provided in any possible implementation manner of the second aspect or the second aspect, or execute a bearer identification management method provided in any possible implementation manner of the fourth aspect or the fourth aspect.

It can be understood that any one of the apparatuses, computer storage media, or computer program products of the bearer establishment method and the bearer identifier management method provided above is used to execute the corresponding method provided above, and therefore, the beneficial effects achieved by the method may refer to the beneficial effects in the corresponding method provided above, and are not described herein again.

Drawings

Fig. 1 is a system architecture diagram of a communication system according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a user equipment according to an embodiment of the present application;

fig. 3 is a flowchart of a bearer establishment method according to an embodiment of the present application;

fig. 4 is a flowchart of a first bearer identification management method according to an embodiment of the present application;

fig. 5 is an interaction example diagram of a first PDU session deactivation process provided in an embodiment of the present application;

fig. 6 is an interaction example diagram of a first UE entering an idle state according to an embodiment of the present application;

fig. 7 is a flowchart of a second bearer identification management method according to an embodiment of the present application;

fig. 8 is a flowchart of a third bearer identification management method according to an embodiment of the present application;

fig. 9 is a flowchart of a fourth bearer identification management method according to an embodiment of the present application;

fig. 10 is an interaction example diagram of a first allocation bearer identifier provided in an embodiment of the present application;

fig. 11 is an interaction example diagram of a second PDU session deactivation process provided in an embodiment of the present application;

fig. 12 is an interaction example diagram of a second procedure of entering an idle state by a UE according to an embodiment of the present application;

fig. 13 is an interaction example diagram of a second allocation bearer identifier provided in an embodiment of the present application;

fig. 14 is a flowchart of a fifth bearer identification management method according to an embodiment of the present application;

fig. 15 is a schematic structural diagram of a user equipment according to an embodiment of the present application;

fig. 16 is a schematic structural diagram of another user equipment according to an embodiment of the present application;

fig. 17 is a schematic structural diagram of a first core network device according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of another first core network device according to an embodiment of the present application.

Detailed Description

Before the present application is described, terms related to embodiments of the present application will be described.

Protocol Data Network (PDN) Connection (Connection or Connectivity): in the second communication system (e.g., in the 4G network), the EPS bearers are a combination of a set of EPS bearers established on the UE, the EPS bearers have the same IP address and Access Point Name (APN), and the EPS bearer refers to a data transmission channel in the second communication system (e.g., in the 4G network). At the UE and network side, a PDN connection is identified by an IP address and APN.

PDN connectivity context: including the IP address used by the PDN connection, the APN, the PDN Gateway (PGW) address, and the Context (Context) information for each EPS bearer.

A Default (Default) EPS bearer refers to an EPS bearer established while establishing a PDN connection, and the Default EPS bearers are all bearers without Guaranteed Bit Rate (non GBR). A Dedicated (Dedicated) EPS bearer refers to a bearer that is established after a PDN connection is established in order to meet a certain Quality of Service (QoS) requirement. Wherein, one PDN connection may include multiple dedicated EPS bearers and one default EPS bearer. The dedicated EPS bearer may be a GBR EPS bearer or a Non GBR EPS bearer.

PDU Session (Session): within a first communication system (e.g., a 5G Network), a set of QoS flows (flows) established on a UE that have the same IP address and Data Network Name (DNN) are combined. A QoS flow refers to a data transmission channel within a first communication system (e.g., within a 5G network). At the UE and network side, one PDU session is identified by an IP address and DNN.

The PDU session is in a deactivated state (deactivated), which may also be referred to as a PDU session being deactivated (deactivated) or a PDU session not being activated (not active), and means that the PDU session is established, but a User Plane (UP) connection of the PDU session does not exist, which may specifically be one or a combination of the following operations: 1. the UPF (User Plane Function) deletes or suspends information corresponding to the base station side in the N3 interface (for example, an IP address, a tunnel identifier, a port number, and the like of the base station, so that the UPF cannot be sent to the base station after downlink data arrives at the UPF). 2. The base station deletes or suspends a Radio resource corresponding to the PDU session (the Radio resource in this application may be a time-frequency resource for carrying Data corresponding to the PDU session, or a Data Radio Bearer (DRB) for carrying Data corresponding to the PDU session, or a combination thereof), and the base station deletes or suspends information on the UPF side in the N3 interface (for example, an IP address, a tunnel identifier, a port number, and the like of the UPF, so that uplink Data cannot be sent to the UPF after reaching the base station). 3. And the UE deletes or suspends the corresponding wireless resources according to the configuration of the base station. The N3 interface is the interface between UPF and base station

The PDU session is in an active state (active), which may also be referred to as activated, and means that the PDU session exists in a user plane connection between the UE and the UPF, and includes an air interface connection between the UE and the base station and a connection of an N3 interface between the base station and the UPF, and when uplink and downlink data arrive in the activated PDU session, the PDU session may be directly transmitted between the UE and the UPF.

PDU session context: including the IP address, APN, SMF and UPF addresses used by the PDU session, and context information for each QoS flow. Wherein one PDU session may include a plurality of QoS flows. There is a QoS flow in the PDU session in the first communication system corresponding to the dedicated EPS bearer in the second communication system and there is a QoS flow corresponding to the default EPS bearer in the second communication system. Specifically, one dedicated EPS bearer may correspond to one or more QoS flows in a PDU session, and one default EPS bearer may also correspond to one or more QoS flows in a PDU session. Optionally, the default EPS bearer may correspond to a default QoS flow. The default QoS flow refers to a QoS flow corresponding to a default QoS rule (rule). Optionally, one dedicated GBR EPS bearer corresponds to one or more GBR QoS flows.

Fig. 1 shows a system architecture of a communication system applied in an embodiment of the present application, where the system architecture includes a first communication system and a second communication system, and fig. 1 illustrates an example in which the first communication system is a 5G communication system and the second communication system is a 4G communication system.

Referring to fig. 1, the communication system includes a UE, an Evolved UMTS Terrestrial Radio Access Network (E-UE ran), a Mobility Management entity MME, a Serving Gateway (S-GW), a User Plane Function (User Plane Function, UPF) + a User Plane of a PDN Gateway (PDN Gateway-User Plane, PGW-U), a Session Management Function (Session Management Function, SMF) + a Control Plane of a PDN Gateway (PDN Gateway-Control Plane, PGW-C), a Policy Control Function (PCF) + a Policy and Charging Rules Function unit (Policy and Charging functions, PCRF), a Home subscription Server (Home Subscriber, HSS) + a Unified Data Management (udmanager, Data Access, Mobility Management Function (Access and Mobility Management Function, Access Gateway and Mobility Management Function (Access Network, 5G-RAN).

The E-UTRAN is a base station at the 4G side, and the UE can access a 4G communication system through the base station; the 5G-RAN is a base station on the 5G side through which the UE can access the 5G communication system, the 5G-RAN may be a base station after the E-UTRAN has further evolved, the UE may access the base station of the 5G communication system through the base station, or the 5G-RAN may be a base station dedicated for the UE to access the 5G communication system.

The MME is 4G core network equipment and is responsible for authentication, authorization, mobility management and session management of the UE; the associated EPS Bearer identity (LBI) of the UE at the PDN connection of 4G is allocated by the device.

The S-GW is a 4G core network device (core network gateway) and is responsible for data forwarding, downlink data storage and the like.

The UPF + PGW-U is core network equipment shared by the 4G and the 5G, namely core network equipment combined by the 4G and the 5G, and comprises functions of the UPF and the PGW-U. The UPF is a user plane device of a 5G core network, provides a user plane service for a PDU session of the UE, and is an interface gateway between an operator network and an external network. The PGW-U is a user plane device of a 4G core network, provides a user plane service for PDN connection of the UE, and is an interface gateway between an operator network and an external network. The UPF + PGW-U can also be called PGW-U + UPF, and the equipment is the same as the equipment as long as the equipment comprises the functions of the UPF and the PGW-U.

The SMF + PGW-C is core network equipment shared by 4G and 5G, namely core network equipment combined by 4G and 5G, and comprises functions of the SMF and the PGW-C. The SMF is control plane equipment of a 5G core network and provides control plane service for PDU conversation of the UE; and managing the PDU session of the 5G, managing the QoS of the 5G, and being responsible for allocating an IP address for the UE and selecting a UPF for the UE. The PGW-C is control plane equipment of a 4G core network and provides user plane service for PDN connection of the UE; and the UE is responsible for allocating an IP address to the UE and establishing an EPS bearer for the UE. SMF + PGW-C may also be referred to as PGW-C + SMF, and is the same as the present device as long as it includes SMF and PGW-C functionality.

The PCF + PCRF is a core network device shared by the 4G and the 5G, that is, a core network device combined by the 4G and the 5G, including the PCF and the PCRF. The PCRF is a 4G core network device and is responsible for generating a policy for a user to establish a data Bearer (Bearer). The PCF is a 5G core network device, similar to the PCRF function. The PCF + PCRF may also be referred to as PCRF + PCF, as long as the device includes PCF and PCRF functions, which are the same as the present device.

The UDM + HSS is core network equipment shared by 4G and 5G, that is, core network equipment combined by 4G and 5G, including the HSS and the UDM. The HSS is 4G core network equipment and is used for storing subscription data of a user. The SDM is 5G core network equipment, and is used to store subscription data of a user. UDM + HSS may also be referred to as HSS + UDM, as long as the device includes both HSS and UDM functionality, which is the same as the present device.

The AMF is a 5G core network device and is used for authenticating and authorizing a user and managing the mobility of the user.

The N26 interface is the interface between the MME and the AMF, which is currently optional. When the UE moves between the 4G and the 5G, the context of the UE can be transferred through an N26 interface, and when the PDN connection established by the UE in the 4G network can be seamlessly transferred to the 5G network, the MME selects a network element SMF + PGW-C combined between the 5G and the 4G for the UE, wherein the seamless transfer refers to that the IP address is unchanged and the PGW-C is unchanged. In addition, the PDU session established by the UE in the 5G network can also be transferred to the 4G network, and the IP address of the UE is ensured to be unchanged.

Fig. 2 is a schematic structural diagram of a user equipment UE according to an embodiment of the present disclosure, where the UE may be a mobile phone, a tablet Computer, a notebook Computer, a UMPC (Ultra-mobile Personal Computer), a netbook, a PDA (Personal Digital Assistant), a mobile chip (e.g., a modem chip), a mobile station, a wearable device, or other user equipment. The embodiment of the present application is described by taking a UE as a mobile phone as an example, where the UE includes: RF (radio frequency) circuit 210, memory 220, input unit 230, display unit 240, gravity sensor 250, audio circuit 260, processor 270, and power supply 280. The following describes each component of the mobile phone in detail with reference to fig. 2:

the RF circuit 210 may be used for receiving and transmitting signals during information transmission and reception or during a call, and in particular, receives downlink information of a base station and then processes the received downlink information to the processor 270; in addition, the uplink data is transmitted to the base station. In general, the RF circuit 210 includes, but is not limited to, an antenna, at least one Amplifier, a transceiver, a coupler, a Low Noise Amplifier (LNA), a duplexer, and the like. In addition, the RF circuitry 210 may also communicate with networks and other devices via wireless communications.

The memory 220 may be used to store software programs and modules, and the processor 270 executes various functional applications and data processing of the mobile phone by operating the software programs and modules stored in the memory 120. The memory 220 may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a call function, a video playing function, etc.), and the like; the storage data area may store data (e.g., a phonebook, photo album, etc.) created according to the use of the cellular phone, and the like. Further, the memory 220 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.

The input unit 230 may be used to receive input numeric or character information and generate key signal inputs related to user settings and function control of the cellular phone. Specifically, the input unit 230 may include a touch panel 231 and other input devices 232. The touch panel 231, also referred to as a touch screen, may collect a touch operation performed by a user on or near the touch panel 231 (e.g., an operation performed by the user on or near the touch panel 231 using any suitable object or accessory such as a finger or a stylus), and drive the corresponding connection device according to a preset program. Alternatively, the touch panel 231 may include two parts of a touch detection device and a touch controller. The touch detection device detects the touch direction of a user, detects a signal brought by touch operation and transmits the signal to the touch controller; the touch controller receives touch information from the touch sensing device, converts the touch information into touch point coordinates, sends the touch point coordinates to the processor 270, and can receive and execute commands sent by the processor 270. In addition, the touch panel 231 may be implemented in various types, such as a resistive type, a capacitive type, an infrared ray, and a surface acoustic wave. The input unit 230 may include other input devices 232 in addition to the touch panel 231. In particular, other input devices 232 may include, but are not limited to, one or more of a physical keyboard, function keys (such as volume control keys, power switch keys, etc.), a trackball, a mouse, a joystick, and the like.

The display unit 240 may be used to display information input by the user or information provided to the user and various menus of the mobile phone. The Display unit 240 may include a Display panel 241, and optionally, the Display panel 241 may be configured in the form of a Liquid Crystal Display (LCD), an Organic Light-Emitting Diode (OLED), or the like. Further, the touch panel 231 may cover the display panel 241, and when the touch panel 231 detects a touch operation thereon or nearby, the touch panel is transmitted to the processor 170 to determine the type of the touch event, and then the processor 270 provides a corresponding visual output on the display panel 241 according to the type of the touch event. Although in fig. 2 the touch panel 231 and the display panel 241 are two separate components to implement the input and output functions of the mobile phone, in some embodiments, the touch panel 231 and the display panel 241 may be integrated to implement the input and output functions of the mobile phone.

The Gravity Sensor (Gravity Sensor)350 may detect the acceleration of the mobile phone in each direction (generally, three axes), detect the Gravity and direction when the mobile phone is stationary, and may be used for applications of recognizing the posture of the mobile phone (such as horizontal and vertical screen switching, related games, magnetometer posture calibration), vibration recognition related functions (such as pedometer, tapping), and the like. The handset may also include other sensors, such as light sensors. In particular, the light sensor may include an ambient light sensor and a proximity light sensor. The ambient light sensor can adjust the brightness of the display panel 241 according to the brightness of ambient light; the proximity light sensor may detect whether an object is near or touching the phone, and may turn off the display panel 241 and/or the backlight when the phone is moved to the ear. The mobile phone can also be provided with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer and an infrared sensor, which are not described in detail herein.

Audio circuitry 260, speaker 261, and microphone 262 may provide an audio interface between a user and a cell phone. The audio circuit 260 may transmit the electrical signal converted from the received audio data to the speaker 261, and convert the electrical signal into a sound signal by the speaker 261 and output the sound signal; on the other hand, the microphone 262 converts the collected sound signals into electrical signals, which are received by the audio circuit 262 and converted into audio data, which are then output to the RF circuit 210 for transmission to, for example, another cell phone, or to the memory 220 for further processing.

The processor 270 is a control center of the mobile phone, connects various parts of the entire mobile phone by using various interfaces and lines, and performs various functions of the mobile phone and processes data by operating or executing software programs and/or modules stored in the memory 220 and calling data stored in the memory 220, thereby integrally monitoring the mobile phone. Alternatively, processor 270 may include one or more processing units; preferably, the processor 270 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into processor 270.

The handset also includes a power supply 280 (e.g., a battery) for powering the various components, which may preferably be logically coupled to the processor 270 via a power management system, such that the power management system may be used to manage charging, discharging, and power consumption.

Although not shown, the mobile phone may further include a WiFi module, a bluetooth module, etc., which are not described herein. Those skilled in the art will appreciate that the handset configuration shown in fig. 2 is not intended to be limiting and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components.

Fig. 3 is a flowchart illustrating a bearer establishment method according to an embodiment of the present application, and referring to fig. 3, the method includes the following steps.

Step 301: when the UE moves from the first communication system to the second communication system, the first core network device receives a first request sent by the second core network device, wherein the first request is used for acquiring EPS bearing information of the UE corresponding to the second communication system in a PDU session of the first communication system. The first request may be that the second core network device requests to Invoke (Invoke) a Service (Service) provided by the first core network device, or the first request may be that the second core network device requests the first core network device to provide the Service for the second core network device.

The first core network device and the second core network device are core network devices of a first communication system, for example, the first communication system may be a 5G communication system, the first core network device may be an SMF in the 5G communication system, and the second core network device may be an AMF in the 5G communication system.

In addition, the PDU session of the UE in the first communication system corresponds to the PDN connection in the second communication system, and the EPS bearer in the PDN connection includes a dedicated EPS bearer and a default EPS bearer, so that both the information of the dedicated EPS bearer and the information of the default EPS bearer may be the information that the PDU session of the UE in the first communication system corresponds to the EPS bearer of the second communication system. Optionally, the dedicated EPS bearer in the present invention may refer to a GBR dedicated EPS bearer. A PDU session and PDN connection should be understood as a combination of one or more of the following: the PDU session and the PDN connection have the same IP address, the same SMF + PGW-C is used for the PDU session and the PDN connection, and the DNN used by the PDU session and the APN used by the PDN connection have a corresponding relation.

Specifically, in the process of moving the UE from the first communication system to the second communication system, when the UE is in an Idle (Idle) state, the UE may actively send an Attach (Attach) request, and move the UE to the second communication system in a registration manner. When the UE is in a Connected (Connected) state, the UE may send a Handover (Handover) request at a base station of the first communication system, and move the UE to the second communication system by means of Handover. In the process that the UE moves from the first communication system to the second communication system through any one of the two manners, the second core network device may send, to the first core network device, a first request for requesting to acquire information of the EPS bearer, where the first request may be a service request, that is, the second core network device requests the first core network device to provide a service, or the second core network device invokes a service provided by the first core network device, so that the first core network device may receive the first request.

Step 302: and when the first core network equipment determines that the PDU session is deactivated, the first core network equipment sends the information of the default EPS bearer of the second communication system corresponding to the PDU session to the second core network equipment. The PDU session corresponds to information of a default EPS bearer of the second communication system, which may be specifically understood as information of a default EPS bearer of a PDN connection of the second communication system corresponding to the PDU session. Optionally, the default EPS bearer information may be generated and stored in the first core network device when the UE establishes the PDU session in the first communication system; meanwhile, the first core network device may also send the information of the default EPS bearer to the UE.

When the first core network device receives the first request sent by the second core network device, the first core network device may determine the current state of the PDU session, and when the PDU session is deactivated, the information of the EPS bearer sent by the first core network device to the second core network device may only include the information of the default EPS bearer. That is, when the first core network device determines that the PDU session is deactivated, the first core network device only sends the information of the default EPS bearer to the second core network device, that is, does not send the information of the dedicated EPS bearer.

In addition, when the first core network device determines that the PDU session is in an active state, the information of the EPS bearer sent by the first core network device to the second core network device may include information of a default EPS bearer and information of a dedicated EPS bearer at the same time. That is, when the first core network device determines that the PDU session is in the active state, the first core network device sends the information of the default EPS bearer and the information of the dedicated EPS bearer to the second core network device. The information of the default EPS bearer and the information of the dedicated EPS bearer belong to a PDN connection corresponding to a PDU session.

Step 303: the UE moves from a first communication system to a second communication system.

Specifically, when the UE moves from the first communication system to the second communication system, the UE may send a Tracking Area Update (TAU) message to a core network device of the second communication system, where the TAU message includes an EPS bearer state (EPS bearer status), in the EPS bearer state, a default EPS bearer corresponding to the second communication system of the PDU session is marked as activated, and a dedicated EPS bearer corresponding to the second communication system of the PDU session is marked as deactivated. Activation represents that the EPS bearer exists on the UE, and deactivation represents that the EPS bearer does not exist on the UE. For example, when there is only one PDU session in the UE, and the EBI (EPS bearer Identity) of the default bearer of the PDN connection corresponding to the PDU session is 5, the EPS bearer status is as shown in table 1:

TABLE 1

EBI	7	6	5	4	3	2	1	0
									Value taking	0	0	1	0	0	0	0	0
EBI	15	14	13	12	11	10	9	8
									Value taking	0	0	0	0	0	0	0	0

When the second communication system is a 4G communication system, the core network device of the second communication system may be a device MME for performing mobility management on the UE.

Step 304: and when the PDU conversation is in a deactivated state, the UE establishes a default EPS bearing corresponding to the PDU conversation in the second communication system.

After the UE moves from the first communication system to the second communication system, when the PDU session of the UE is in a deactivated state, the UE may establish a default EPS bearer corresponding to the PDU session only in the second communication system. In addition, after the UE moves from the first communication system to the second communication system, when the PDU session of the UE is in an active state, the UE may establish a default EPS bearer and a dedicated EPS bearer corresponding to the PDU session in the second communication system. Here, the UE establishes a default EPS bearer corresponding to the PDU session in the second communication system, which specifically includes: when the UE moves from the first communication system to the second communication system in an idle state, the UE locally generates a context of a default EPS bearer, and directly establishes the default EPS bearer when the UE enters a connection state again; when the UE moves from the first communication system to the second communication system in a connected state, the UE locally generates a context of a default EPS bearer, and establishes the default EPS bearer after the UE receives DRB configuration information of the default EPS bearer sent by the base station.

Specifically, when the PDU session is in a deactivated state, the UE may delete the dedicated EPS bearer of the second communication system corresponding to the PDU session. Because the PDN connection corresponding to the PDU session in the second communication system includes the default EPS bearer and the dedicated EPS bearer, the UE deletes the dedicated EPS bearer and retains the default EPS bearer, so that the default EPS bearer corresponding to the PDU session can be established only in the second communication system.

Or, when the PDU session is in a deactivated state, the UE deletes the QoS flow in the PDU session corresponding to the dedicated EPS bearer. Because one or more QoS flows corresponding to the dedicated EPS bearer and one or more QoS flows corresponding to the default EPS bearer exist in the QoS flows included in the PDU session, the UE deletes the QoS flow corresponding to the dedicated EPS bearer and reserves the QoS flow corresponding to the default EPS bearer, so that the default EPS bearer corresponding to the PDU session can be established only in the second communication system.

Or, when the PDU session is in a deactivated state, the UE deletes the dedicated EPS bearer corresponding to the PDU session and the QoS flow in the PDU session corresponding to the dedicated EPS bearer at the same time, so that the default EPS bearer corresponding to the PDU session is established only in the second communication system.

In the embodiment of the application, in the process that the UE moves from the first communication system to the second communication system, the first core network device receives a first request sent by the second core network device, where the first request is used to obtain information of an EPS bearer of the UE in the second communication system corresponding to a PDU session of the first communication system, and when the PDU session is deactivated, the first core network device sends the information of a default EPS bearer of the PDU session corresponding to the second communication system to the second core network device.

Fig. 4 is a flowchart of a method for managing an Bearer Identity (EBI) according to an embodiment of the present disclosure, where referring to fig. 4, the method may include: step 401-step 402. The method shown in fig. 4 may not only be used for managing the identifier of the bearer separately, but also be applied to the bearer establishment method described in fig. 3, and step 401 and step 402 may be specifically located before step 201 shown in fig. 3.

Step 401: when the PDU session of the UE in the first communication system is deactivated, the UE sets the first EBI of the dedicated EPS bearing corresponding to the PDU session in the second communication system as unavailable.

Step 402: and the first core network equipment sets the first EBI of the special EPS bearer corresponding to the PDU session of the second communication system as unavailable.

Optionally, in step 401 and step 402, the UE and the first core network device both locally set the first EBI as unavailable, and the first core network device locally sets the first EBI as unavailable or replaced by, the UE sends a modification message to the first core network device, where the modification message is used to instruct the first core network device to set the first EBI as unavailable, so that the first core network device may set the first EBI as unavailable after receiving the modification message. The modification message may be a PDU session modification message that may contain a list of EBIs that are set to unavailable.

The first communication system may be a 5G communication system, the second communication system may be a 4G communication system, and the first core network device may be an SMF in the 5G communication system.

In addition, the dedicated EPS bearer of the PDU session corresponding to the second communication system may include one or more dedicated EPS bearers, where one EPS bearer is described as an example, and the UE and the first core network device perform consistent processing on each dedicated EPS bearer in the one or more dedicated EPS bearers.

Specifically, when the UE or the first core network device may set the first EBI of the dedicated EPS bearer as unavailable, the UE or the first core network device may delete the first EBI of the dedicated EPS bearer, or deactivate the first EBI of the dedicated EPS bearer. Deactivating the first EBI may refer to the first EBI being marked as an unavailable state or being marked as a deactivated state.

Since the first context includes the first EBI of the dedicated EPS bearer, and the first context refers to the context of the dedicated EPS bearer, the UE or the first core network device may process the first context in three different manners, so as to make the first EBI of the dedicated EPS bearer unavailable. Specifically, the UE is taken as an example to be described below, and the processing of the first core network device is consistent with the processing of the UE.

First, the UE deletes the first context, where the first context includes the first EBI of the dedicated EPS bearer, that is, the UE deletes the first context and also deletes the first EBI. Accordingly, the first core network device deletes the first context of the first EBI, thereby deleting the first EBI.

Secondly, the UE deactivates the first context and deletes the first EBI of the dedicated EPS bearer in the first context, so that the UE can delete the first EBI. Correspondingly, the first core network device deactivates the first context and deletes the first EBI of the dedicated EPS bearer in the first context. Deactivating the first context may refer to the first context being marked as unavailable or as deactivated.

And thirdly, the UE deactivates the first context, wherein the first context comprises the first EBI of the special EPS bearer, namely the UE deactivates the first context and simultaneously deactivates the first EBI. Accordingly, the first core network device deactivates the first context, and the first EBI is included in the first context, thereby deactivating the first EBI. Deactivating the first context and the first EBI herein may refer to the first context and the first EBI being marked as unavailable or being marked as deactivated.

Exemplarily, taking the first communication system shown in fig. 1 as a 5G communication system, the second communication system as a 4G communication system, and the first core network device as an SMF as an example, a process of setting the first EBI of the dedicated EPS bearer corresponding to the PDU session as unavailable by any one of the three manners in the PDU session deactivation process by the UE and the SMF is shown in fig. 5. The method specifically comprises the following steps: s501, the SMF determines that the PDU session needs to enter a deactivation state; s502a, the SMF sends an N4 session modification request to the UPF, wherein the N4 session modification request is used for requesting the UPF to delete a data transmission channel between the UPF and the RAN; s502b, the UPF sends an N4 session modification response to the SMF; S503-S504.smf sends message to RAN through AMF, where the message is used to inform RAN to delete the resource corresponding to the PDU session (S503.smf sends N11 message to AMF, S504.AMF sends N2PDU session request to RAN); s505.RAN sends resource release message to UE, the resource release message is used to release the radio resource corresponding to PDU conversation; s506-s507.ran sends acknowledgement message to SMF through AMF (s506.ran sends N2PDU session response to AMF, s507.AMF sends N11 message to SMF); s508, when the UE determines that the PDU conversation is in a deactivation state, the UE deletes or deactivates the first EBI of the special EPS bearing, namely the UE can delete the first EBI or set the first EBI to be in a deactivation state; and S509, deleting or deactivating the first EBI by the SMF, namely the SMF can delete or set the first EBI to be in a deactivated state.

Or, in the process that the UE enters the idle state, the UE and the SMF may set the first EBI of the dedicated EPS bearer to be unavailable through any one of the three manners as shown in fig. 6. The method specifically comprises the following steps: s601, when the RAN determines that the UE is in an idle state, the RAN sends a UE context release request to the AMF; s602, the AMF sends an N11PDU session deactivation request to the SMF corresponding to the PDU session of the UE; S603a.SMF sends a N4 session modification request to UPF, wherein the N4 session modification request is used for requesting the UPF to delete a data transmission channel between the UPF and the RAN; the method comprises the steps that S603b.UPF sends an N4 session modification response to SMF; S604-S605.SMF sends message to RAN through AMF, the message is used to inform RAN to delete the resource corresponding to PDU conversation (S604.SMF sends PDU conversation deactivation response to AMF, S605.AMF sends UE context release order to RAN); s606, the RAN sends a resource release message to the UE for releasing a signal channel (release of signal path over the AN) between the UE and the RAN; s607.RAN sends UE context release complete message to AMF; s608, when the UE determines to enter an idle state, the UE deletes or deactivates the first EBI of the dedicated bearer corresponding to the PDU session, that is, the UE can delete the first EBI or set the first EBI to a deactivated state; and S609, deleting or deactivating the first EBI by the SMF, namely the SMF can delete or set the first EBI to be in a deactivated state.

Further, referring to fig. 4, when the PDU session is reactivated, the UE may also allocate a second EBI for the dedicated EPS bearer corresponding to the PDU session. The process of allocating the second EBI by the UE corresponds to the three ways of processing the first context described above, which are specifically described below.

In type I, when the UE and the first core network device process the first context in the first manner (i.e., delete the first context, the first context includes the first EBI), referring to fig. 7, after step 401 and step 402, the method may further include: step 403 a-step 407 a.

Step 403 a: when the PDU session is activated, the first core network device determines a second context, where the second context is a context of the dedicated EPS bearer.

Since the first core network device deletes the first context of the dedicated EPS bearer when the PDU session is deactivated, when the PDU session is reactivated, the first core network device may determine the second context of the dedicated EPS bearer, for example, the first core network device regenerates the context of the dedicated EPS bearer, and the generated context may be referred to as the second context.

Step 404 a: the first core network device sends a first message to the UE, wherein the first message comprises a second context.

After the first core network device determines the second context, the first core network device may send a first message to the UE, where the first message includes the second context, so as to send the second context to the UE.

Step 405 a: and when the UE receives the first message, the UE allocates a second EBI for the special EPS bearing corresponding to the second context.

When the UE receives the first message, the UE may allocate a second EBI to the dedicated EPS bearer corresponding to the second context, and determine a correspondence between the second EBI and the second context, for example, store the second EBI in the second context, thereby activating the second context.

Step 406 a: the UE sends the second EBI to the first core network device.

Step 407 a: when the first core network device receives the second EBI sent by the UE, the first core network device determines a correspondence between the second context and the second EBI, where the second EBI is an EBI of the dedicated EPS bearer corresponding to the second context.

When the first core network device receives the second EBI sent by the UE, the first core network device may determine a correspondence between the second context and the second EBI, for example, the first core network device associates the second context and the second EBI, or the first core network device associates a dedicated EPS bearer and the second EBI corresponding to the second context, or stores the second EBI in the second context.

Further, when the dedicated EPS bearer corresponding to the PDU session includes multiple EPS bearers, the second context may be the contexts of the multiple dedicated EPS bearers, so that the UE may allocate a second EBI to each dedicated EPS bearer in the multiple dedicated EPS bearers, and send the second EBI of the multiple dedicated EPS bearers to the first core network device according to the same arrangement order of the multiple dedicated EPS bearers in the second context. The first core network device determines a correspondence between each second EBI and a context of a corresponding dedicated EPS bearer.

In type II, when the UE and the first core network device process the first context in the second manner (i.e. deactivate the first context and delete the first EBI included in the first context), referring to fig. 8, after step 401 and step 402, the method may further include: step 403 b-step 407 b.

Step 403 b: when the PDU session is activated, the first core network device sends a second message to the UE, the second message including an identification QFI set of QoS flows, the QFI set corresponding to the dedicated EPS bearer.

The QFI set may include an identifier of one QoS flow, or may include identifiers of multiple QoS flows, and specifically, the number of QFI sets is related to the number of dedicated EPS bearers. Because one dedicated EPS bearer may correspond to one or more QoS flows, when the dedicated EPS bearer corresponds to one QoS flow in the PDU session, the QFI set is an identifier of one QoS flow, and when the dedicated EPS bearer corresponds to multiple QoS flows in the PDU session, the QFI set includes identifiers of multiple QoS flows. The QFI set may be understood as a set of identities of QoS flows corresponding to one EPS bearer.

Step 404 b: and when the UE receives the second message, the UE allocates a second EBI for the dedicated EPS bearer corresponding to the QFI set.

When the UE receives the second message, the UE may allocate a second EBI for the dedicated EPS bearer corresponding to the QFI set included in the second message. Further, the UE may determine, through the QFI set, that the context of the dedicated EPS bearer is the first context, thereby determining a correspondence relationship between the second EBI and the first context, for example, store the second EBI in the first context, and activate the first context.

Step 405 b: the UE sends the second EBI to the first core network device.

Specifically, the sending, by the UE, the second EBI to the first core network device may include: and the UE only sends the second EBI to the first core network equipment, or the UE sends the corresponding relation between the QFI set and the second EBI to the first core network equipment.

Further, when the dedicated EPS bearer corresponding to the PDU session includes multiple EPS bearers, the second message may include multiple QFI sets, so that the UE may allocate a second EBI to each QFI set in the multiple QFI sets, and send the second EBIs of the dedicated EPS bearers to the first core network device according to the same ranking order of the multiple QFI sets in the second message.

Step 406 b: and the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is the EBI of the special EPS bearer corresponding to the QFI set.

The receiving, by the first core network device, the second EBI sent by the UE includes: the first core network device receives only the second EBI, or the first core network device receives the correspondence between the QFI set and the second EBI.

Step 407 b: the first core network device determines a correspondence between the first context and the second EBI.

When the first core network device receives the second EBI, the first core network device may determine a correspondence between the first context and the second EBI, for example, the first core network device associates the first context and the second EBI, or the first core network device associates a dedicated EPS bearer corresponding to the first context and the second EBI, or stores the second EBI in the first context. Further, since the first core network device deactivates the first context when the PDU session is deactivated, the first core network device may further set the first context to an active state.

In type III, when the UE and the first core network device process the first context in a third manner (i.e. deactivate the first context, the first context includes the first EBI), referring to fig. 9, after step 401 and step 402, the method may further include: step 403 c-step 407 c.

Step 403 c: when the PDU session is activated, the first core network device sends a third message to the UE, the third message including the first EBI.

Step 404 c: and when the UE receives the third message, the UE allocates a second EBI for the special EPS bearer corresponding to the first EBI.

When the UE receives the third message, the UE may allocate a second EBI for the dedicated EPS bearer corresponding to the first EBI included in the third message. Further, the UE may determine, through the first EBI, that the context of the dedicated EPS bearer is the first context, thereby determining a correspondence between the second EBI and the first context, for example, store the second EBI in the first context, and activate the first context.

Step 405 c: the UE sends the second EBI to the first core network device.

Specifically, the sending, by the UE, the second EBI to the first core network device may include: the UE sends the second EBI only to the first core network device, or the UE sends the correspondence between the first EBI and the second EBI to the first core network device.

Further, when the dedicated EPS bearer corresponding to the PDU session includes multiple EPS bearers, the third message may include multiple first EBIs, so that the UE may allocate a second EBI to the dedicated EPS bearer corresponding to each first EBI in the multiple first EBIs, and send the second EBIs of the multiple dedicated EPS bearers to the first core network device according to the same arrangement order of the multiple first EBIs in the third message.

Step 406 c: and the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is the EBI of the special EPS bearer corresponding to the QFI set.

The receiving, by the first core network device, the second EBI sent by the UE includes: the first core network device receives only the second EBI, or the first core network device receives the correspondence between the first EBI and the second EBI.

Step 407 c: the first core network device determines a correspondence between the first context and the second EBI.

For example, taking the first communication system shown in fig. 1 as a 5G communication system, the second communication system as a 4G communication system, and the first core network device as an SMF as an example, a process of the UE re-performing the second EBI for the dedicated EPS bearer is shown in fig. 10. The method specifically comprises the following steps: s1001, the UE sends a Service Request (Service Request) message to the RAN, and requests to enter a connection state or Request to activate a PDU session indicated by a session ID of the PDU session through the Service Request message; s1002, the AMF sends an N11 message to the SMF, wherein the message contains the session ID and is used for requesting to activate the PDU session indicated by the session ID; the SMF indicates that the UPF modifies the data channel of the PDU session (S1003a. the SMF sends a session modification request of N4 to the UPF, the session modification request of N4 is used for requesting the UPF to modify the data transmission channel between the UPF and the RAN; S1003b. the UPF sends a session modification response of N4 to the SMF); S1004-S1005.SMF sends the PDU session information to RAN through AMF for establishing transmission channel (S1004.AMF sends N11 message to SMF, S1005.AMF sends N2 request to RAN); s1006, the RAN sends an RRC connection reconfiguration message to the UE; S1007-S1008.ran sends an Acknowledgement message to SMF through AMF, where the Acknowledgement message includes information of QoS flow of the PDU session, and the QoS flow corresponds to the dedicated EPS bearer (S1007.ran sends N2 request Acknowledgement (ACK) to AMF, S1008.AMF sends N11 message to SMF); S1009.SMF confirms the QoS flow in the activated state and the corresponding special EPS bearing context; s1010, SMF sends N11 message to AMF, wherein the message contains PDU conversation modification command; s1011.AMF sends PDU conversation modification command to UE; s1012, the UE allocates a second EBI for the special EPS bearing corresponding to the PDU session; s1013, the UE sends PDU session modification confirmation to the AMF, and the confirmation message carries a second EBI; s1014, the AMF sends an N11 message to the SMF, wherein the message contains a PDU session modification confirmation, and the confirmation message carries a second EBI; and S1015, the SMF determines the corresponding relation between the context of the special EPS bearing and the second EBI. The N11 message sent by the SMF to the AMF may be that the SMF invokes a service provided by the AMF, or that the SMF requests the AMF to provide a service for it.

In the embodiment of the application, when the UE is deactivated in a PDU session of a first communication system, the UE may delete or deactivate a first EBI of a dedicated EPS bearer corresponding to the PDU session, and when the PDU session is reactivated, the UE may allocate a second EBI of the dedicated EPS bearer corresponding to the PDU session, so that the application may avoid a problem that the EBI of the EPS bearer of the UE is insufficient when the UE moves from the first communication system to a second communication system through the processing of the EBI of the dedicated EPS bearer by the UE because the number of the EBIs limited.

Further, with reference to fig. 4, when the PDU session is reactivated, a second core network device in the first communication system (e.g., an AMF in the 5G communication system) may allocate a second EBI for the dedicated EPS bearer corresponding to the PDU session.

Accordingly, when the UE and the first core network device set the first EBI as unavailable through any of the first to third manners, the second core network device may recover the first EBI, that is, the second core network device may mark the first EBI as available for being allocated to other EPS bearers.

Exemplarily, taking the first communication system shown in fig. 1 as a 5G communication system, the second communication system as a 4G communication system, the first core network device as an SMF, and the second core network device as an AMF as an example, a procedure that the UE and the SMF make the first EBI of the dedicated EPS bearer unavailable through any one of the first to third manners in the PDU session deactivation process is shown in fig. 11. The method specifically comprises the following steps: s1101, determining that the PDU session needs to enter a deactivation state by the SMF; s1102a, SMF sends a N4 session modification request to UPF, wherein the N4 session modification request is used for requesting the UPF to delete a data transmission channel between the UPF and RAN; S1102b.UPF sends N4 session modification response to SMF; S1103-S1104.smf sends a message to RAN through AMF, where the message is used to notify the RAN to delete the resource corresponding to the PDU session (S1103.smf sends N11 message to AMF, S1104.AMF sends N2PDU session request to RAN); s1105, RAN sends resource release message to UE, the resource release message is used to release wireless resource corresponding to PDU conversation; s1106-s1107.ran sends an acknowledgement message to SMF via AMF (S1106.ran sends N2PDU session response to AMF, S1107.AMF sends N11 message to SMF); s1108, when the UE determines that the PDU session is in a deactivated state, the UE deletes or deactivates the first EBI of the dedicated bearer corresponding to the PDU session, that is, the UE can delete the first EBI or set the first EBI in a deactivated state; s1109. the smf obtains an EBI list corresponding to a QoS flow of the PDU session, where the QoS flow corresponds to the dedicated EPS bearer, for example, the EBI list includes a first EBI; s1110, the SMF sends an N11 message to the AMF, wherein the message contains the EBI list; s1111. the AMF recovers the EBI corresponding to the EBI list, that is, the AMF may mark the EBI corresponding to the EBI list as an available state, so as to allocate the EBI to other EPS bearers, for example, the AMF recovers the first EBI and allocates it to other EPS bearers; s1112. the amf sends an N11 message to the SMF, the N11 message being used to reply to the SMF with an acknowledgement; and S1113, the SMF deletes or deactivates the EBI of the dedicated EPS bearer corresponding to the PDU session, for example, deletes or deactivates the first EBI, that is, the SMF can delete or deactivate the first EBI. The N11 message sent by the SMF to the AMF may be that the SMF calls a service provided by the AMF, or that the SMF requests the AMF to provide the service.

Alternatively, in the process that the UE enters the idle state, a process that the UE and the SMF may make the first EBI of the dedicated EPS bearer unavailable through any one of the first to third manners may be as shown in fig. 12. The method specifically comprises the following steps: s1201, when the RAN determines that the UE is in an idle state, the RAN sends a UE context release request to the AMF; s1202. the AMF sends an N11PDU conversation deactivation request to the SMF corresponding to the PDU conversation of the UE; s1203a, SMF sends a N4 session modification request to UPF, wherein the N4 session modification request is used for requesting the UPF to modify a data transmission channel between the UPF and RAN; S1203b.UPF sends N4 conversation to SMF to modify the response; S1204-S1205.smf sends a message to RAN through AMF, where the message is used to notify RAN to delete the resource corresponding to the PDU session (S1204.smf sends a PDU session deactivation response to AMF, S1205.amf sends a UE context release command to RAN); s1206.RAN sends resource release message to UE for releasing signal channel between UE and RAN; s1207, the RAN sends a UE context release completion message to the AMF; s1208, when the UE determines to enter an idle state, the UE deletes or deactivates the first EBI of the dedicated EPS bearer corresponding to the PDU session, that is, the SMF can delete the first EBI or set the first EBI to a deactivated state; s1209, the smf obtains an EBI list corresponding to a QoS flow of the PDU session, where the QoS flow corresponds to the dedicated EPS bearer, for example, the EBI list includes a first EBI; s1210, the SMF sends an N11 message to the AMF, wherein the message contains the EBI list; s1211, the AMF recovers the EBI corresponding to the EBI list, that is, the AMF can mark the EBI corresponding to the EBI list as an available state, so that the EBI can be allocated to other EPS bearers, for example, the AMF recovers the first EBI and allocates the first EBI to other EPS bearers; s1212. the amf sends an N11 message to the SMF, the N11 message being used to reply to the SMF with an acknowledgement; s1213, the SMF deletes or deactivates the EBI of the dedicated EPS bearer corresponding to the PDU session, for example, deletes or deactivates the first EBI, that is, the SMF may delete or deactivate the first EBI. The N11 message sent by the SMF to the AMF may be that the SMF calls a service provided by the AMF, or that the SMF requests the AMF to provide the service.

Specifically, referring to fig. 13, the process of allocating the second EBI by the second core network device may include the following steps, which are described in detail below.

Step 403 d: when the PDU session is activated, the first core network device sends a second request to the second core network device, where the second request is used to request allocation of a second EBI for a dedicated EPS bearer corresponding to the PDU session.

The second request may be that the first core network device requests to Invoke (Invoke) a Service (Service) provided by the second core network device, or the second request may be that the first core network device requests the second core network device to provide the Service for the first core network device.

The dedicated EPS bearer corresponding to the PDU session may include one or more QFI sets, where the second request sent by the first core network device to the second core network device may include a QFI set of the QoS flow of the PDU session, and the QFI set corresponds to the dedicated EPS bearer corresponding to the PDU session, that is, when the number of the dedicated EPS bearers corresponding to the PDU session is multiple, the second request may include the QFI sets of the same number. Or the second request includes the number of the second EBIs requested to be allocated, and the number of the second EBIs requested to be allocated is the same as the number of the dedicated EPS bearers corresponding to the PDU session.

Step 404 d: and when the second core network equipment receives the second request, the second core network equipment allocates a second EBI for the special EPS bearer.

When the second request includes the QFI sets of the QoS flows of the PDU session, and the second core network device receives the second request, the second core network device may allocate one second EBI to the dedicated EPS bearer corresponding to each QFI set included in the second request. Or, when the second request includes the number of the second EBIs requested to be allocated, the second core network device may allocate the same number of second EBIs, where each second EBI corresponds to one dedicated EPS bearer corresponding to the PDU session, so as to allocate one second EBI to each dedicated EPS bearer.

Step 405 d: and the second core network equipment sends the second EBI to the first core network equipment.

Step 406 d: and the first core network equipment receives the second EBI sent by the second core network equipment and determines the corresponding relation between the context of the special EPS bearer and the second EBI.

When the first core network device receives the second EBI sent by the second core network device, the first core network device may determine a correspondence between the context of the dedicated EPS bearer and the second EBI. Further, the first core network device may also send the second EBI to the UE.

With reference to fig. 13, the process of determining the corresponding relationship between the context of the dedicated EPS bearer and the second EBI by the first core network device and sending the second EBI to the UE corresponds to the three manners of processing the first context by the first core network device and the UE, which are described in detail below.

In (i), when the UE and the first core network device process the first context in the first manner (i.e., delete the first context, the first context including the first EBI), after the first core network device receives the second EBI in step 406d, the method may further include: step 407 a-step 410 a.

Step 407 a: the first core network device determines a second context, and the second context is the context of the dedicated EPS bearer.

Correspondingly, the determining, by the first core network device, the corresponding relationship between the context of the dedicated EPS bearer and the second EBI refers to determining the corresponding relationship between the second context and the second EBI, or determining the corresponding relationship between the dedicated EPS bearer corresponding to the second context and the second EBI, for example, storing the second EBI in the second context.

Step 408 a: the first core network device sends a sixth message to the UE, the sixth message including the second context and the second EBI.

Step 409 a: the UE receives a sixth message sent by the first core network device, where the second context is a context of the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer.

Step 410 a: the UE determines a correspondence of the second EBI to the second context.

When the UE receives the second context and the second EBI sent by the first core network device, the UE may determine a correspondence between the second context and the second EBI, or associate the dedicated EPS bearer and the second EBI corresponding to the second context, for example, the UE associates the second context and the second EBI, or stores the second EBI in the second context.

In (ii), when the UE and the first core network device process the first context in the second manner (i.e., delete the first context and delete the first EBI included in the first context), after the first core network device receives the second EBI in step 406d, the method may further include: step 407 b-step 409 b.

Step 407 b: and the first core network equipment sends a fourth message to the UE, wherein the fourth message comprises the corresponding relation between a QFI set and the second EBI, and the QFI set is the identifier of the QoS flow corresponding to the special EPS bearer in the QoS flow of the PDU session.

When the first core network device processes the first context in the second manner, in step 406d, the first core network device determines the correspondence between the context of the dedicated EPS bearer and the second EBI, which means determining the correspondence between the first context and the second EBI, or determining the correspondence between the dedicated EPS bearer corresponding to the first context and the second EBI, for example, storing the second EBI in the first context. Further, the first core network device may also activate the first context.

In addition, the QFI set may include an identifier of one QoS flow, and may also include identifiers of multiple QoS flows, and specifically, the number of identifiers of QoS flows included in the QFI set is related to the number of dedicated EPS bearers. Because one dedicated EPS bearer may correspond to one or more QoS flows, when the dedicated EPS bearer corresponds to one QoS flow in the PDU session, the QFI set is an identifier of one QoS flow, and when the dedicated EPS bearer corresponds to multiple QoS flows in the PDU session, the QFI set includes identifiers of multiple QoS flows.

Step 408 b: the UE receives a fourth message sent by the first core network device, where the fourth message includes a correspondence between a QFI set and a second EBI, the QFI set corresponds to the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer.

Step 409 b: the UE determines a correspondence of the second EBI to the first context.

When the UE receives the correspondence between the QFI set and the second EBI sent by the first core network device, the UE may determine the first context according to the QFI set, and further determine the correspondence between the first context and the second EBI, or determine the correspondence between the dedicated EPS bearer corresponding to the first context and the second EBI, for example, the UE associates the first context and the second EBI, or stores the second EBI in the first context. Further, since the UE deactivates the first context when the PDU session is deactivated, the UE may also set the first context to an active state.

(iii) when the UE and the first core network device process the first context in the third manner (i.e. deactivate the first context, the first context including the first EBI), after the first core network device receives the second EBI in step 406d, the method may further include: step 407 c-step 409 c.

Step 407 c: and the first core network equipment sends a fifth message to the UE, wherein the fifth message comprises the corresponding relation between the first EBI and the second EBI, and the second EBI is the EBI allocated to the special EPS bearer.

When the first core network device processes the first context in the third manner, in step 224, the first core network device determines the corresponding relationship between the context of the dedicated EPS bearer and the second EBI, which means determining the corresponding relationship between the first context and the second EBI, or determining the corresponding relationship between the dedicated EPS bearer corresponding to the first context and the second EBI, for example, storing the second EBI in the first context. Further, the first core network device may also activate the first context.

Step 408 c: the UE receives a fifth message sent by the first core network device, where the fifth message includes a correspondence between the first EBI and a second EBI, and the second EBI is an EBI allocated to the dedicated EPS bearer.

Step 409 c: the UE determines a correspondence of the second EBI to the first context.

When the UE receives the correspondence between the first EBI and the second EBI sent by the first core network device, the UE may determine the correspondence between the first context and the second EBI according to the correspondence between the first EBI and the first context and the correspondence between the first EBI and the second EBI, or determine the correspondence between the dedicated EPS bearer corresponding to the first context and the second EBI, for example, the UE associates the first context and the second EBI, or stores the second EBI in the first context. Further, since the UE deactivates the first context when the PDU session is deactivated, the UE may also set the first context to an active state.

For example, taking the first communication system shown in fig. 1 as a 5G communication system, the second communication system as a 4G communication system, the first core network device as an SMF, and the second core network device as an AMF as an example, a process of the AMF re-performing the second EBI for the dedicated EPS bearer is shown in fig. 14. The method specifically comprises the following steps: s1401, the UE sends a service request message to RAN, and requests to enter a connection state or request to activate a PDU session indicated by a PDU session ID through the service request message; s1402, the AMF sends an N11 message to the SMF, wherein the message contains a PDU session ID used for requesting to activate the PDU session indicated by the PDU session ID; S1403.SMF indicates UPF to delete and modify the PDU session data channel (S1403a.SMF sends N4 session modification request to UPF, the N4 session modification request is used for requesting UPF to modify the data transmission channel between UPF and RAN; S1403b.UPF sends N4 session modification response to SMF); S1404-S1405.SMF sends the PDU session information to RAN through AMF for establishing transport channel (S1404.AMF sends N11 message to SMF, S1405.AMF sends N2 request to RAN); s1406. the RAN sends RRC connection configuration to the UE; S1407-S1408.ran sends an acknowledgement message to SMF through AMF, which contains information of the activated QoS flow within the PDU session, which corresponds to the dedicated EPS bearer corresponding to the PDU session (S1407.ran sends N2 request acknowledgement to AMF, S1408.AMF sends N11 message to SMF); s1409. the SMF determines the activated QoS flow and the corresponding EPS bearing context; s1410.smf sends N11 message to AMF, where the message contains identification list (QFI list) of QoS flow in active state; s1411, the AMF allocates EBI for the special EPS bearing corresponding to the QoS flow which is in the activated state according to the QFI list; s1412, the AMF sends an N11 message to the SMF, wherein the message contains the second EBI; s1413, the SMF sets the first context to be in an activated state and associates the first context with the second EBI; s1414, the SMF sends an N11 message to the AMF, wherein the N11 message contains a PDU session modification command, and the command carries a second EBI, namely the EBIs of the plurality of special EPS bearers; s1415, the AMF sends a PDU session modification command to the UE, and the name carries a second EBI; s1416, the UE sets the first context to an activated state and associates the first context with the second EBI.

In this embodiment of the present application, when the UE is deactivated in a PDU session of a first communication system, the first core network device may delete or deactivate a first EBI of a dedicated EPS bearer corresponding to the PDU session to enable the second core network device to recover the first EBI, and when the PDU session is reactivated, the second core network device may re-allocate a second EBI to the dedicated EPS bearer corresponding to the PDU session and send the second EBI to the first core network device and the UE.

The above-mentioned scheme provided by the embodiment of the present application is introduced mainly from the perspective of interaction between network elements. It will be appreciated that the various network elements, such as the UE and the first core network node, etc., for implementing the above-described functions, comprise corresponding hardware structures and/or software modules for performing the respective functions. Those of skill in the art would readily appreciate that the present application is capable of being implemented as hardware or a combination of hardware and computer software for performing the exemplary network elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

In the embodiment of the present application, according to the above method example, the UE and the first core network node may be divided into functional modules, for example, each functional module may be divided corresponding to each function, or two or more functions may be integrated into one processing module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.

In the case of adopting the functional modules divided for the respective functions, fig. 15 shows a possible structural diagram of the UE involved in the above embodiment, where the UE includes: a moving unit 1501 and a processing unit 1502. Wherein, the mobile unit 1501 is configured to support the UE to perform step 303 in fig. 3; processing unit 1502 is configured to support the UE to perform step 304 in fig. 3 and/or configured to support the UE to perform step 401 in fig. 4.

Further, the UE may further include a transmitting unit 1503 and a receiving unit 1504. Wherein processing unit 1502 is further configured to support the UE to perform steps 401 and 405a in fig. 7, steps 401 and 404b in fig. 8, or steps 401 and 404c in fig. 9, or to perform step 401 in fig. 13, and/or other processes for the techniques described herein; the sending unit 1503 is configured to support the UE to perform step 406a in fig. 7, step 405b in fig. 8, or step 405c in fig. 9; the receiving unit 1504 is used to support the step of the UE receiving the first message transmitted in step 404a of fig. 7, the step of receiving the second message transmitted in step 403b of fig. 8, or the step of receiving the third message transmitted in step 403c of fig. 9.

In terms of hardware implementation, the processing unit 1502 may be a processor; the sending unit 1503 may be a sender, the receiving unit 1504 may be a receiver, and the receiver and the sender may form a communication interface; the mobile unit 1501 may be a functional module in a processor and communication interface for supporting the movement of a UE from a first communication system to a second communication system.

Fig. 16 is a schematic diagram illustrating a possible logical structure of a UE involved in the foregoing embodiments according to an embodiment of the present application. The UE includes: a processor 1602, a communication interface 1603, a memory 1601, and a bus 1604. The processor 1602, the communication interface 1603, and the memory 1601 are connected to each other via a bus 1604. In an embodiment of the present application, processor 1602 is configured to control and manage the actions of the UE, for example, processor 1602 is configured to support the UE to perform steps 401 and 405a in fig. 7, steps 401 and 404b in fig. 8, or steps 401 and 404c in fig. 9, or to perform step 401 in fig. 13, and/or other processes for the techniques described herein. Communication interface 1603 is used to support the UE for communication. A memory 1601 for storing program codes and data for the UE.

The processor 1602 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a digital signal processor and a microprocessor, or the like. The bus 1604 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 16, but this is not intended to represent only one bus or type of bus.

In a case that each functional module is divided according to each function, fig. 17 shows a schematic diagram of a possible structure of the core network device according to the foregoing embodiment, where the core network device is used as a first core network device, and includes: a receiving unit 1701 and a transmitting unit 1702. Wherein, the receiving unit 1701 is configured to support the first core network device to execute step 301 in fig. 3; the sending unit 1702 is configured to support the first core network device to perform step 302 in fig. 3.

Further, the first core network device may further include a processing unit 1703. Wherein, the processing unit 1703 is configured to support the first core network device to perform step 402 in fig. 4, step 402-step 403a and step 407a in fig. 7, step 402 and steps 406b-407b in fig. 8, or step 402 and step 406 c-step 407c in fig. 9, or to perform step 402 and step 406d in fig. 13, and/or other processes for the techniques described herein; the receiving unit 1701 is further configured to support the first core network device to receive the second EBI sent in step 406a of fig. 7, receive the second EBI sent in step 405b of fig. 8, receive the second EBI sent in step 405c of fig. 9, or receive the second EBI sent in step 405d of fig. 13; the sending unit 1702 is further configured to support the first core network device to perform step 404a in fig. 7, step 403b in fig. 8, step 403c in fig. 9, or step 403d in fig. 13.

In terms of hardware implementation, the processing unit 1703 may be a processor; the receiving unit 1701 may be a receiver, the transmitting unit 1702 may be a transmitter, and the receiver and the transmitter may constitute a communication interface.

Fig. 18 is a schematic diagram illustrating a possible logical structure of a core network device according to the foregoing embodiments, provided in this application. The core network device, as a first core network device, includes: a processor 1802, a communication interface 1803, a memory 1801, and a bus 1804. The processor 1802, the communication interface 1803, and the memory 1801 are interconnected by a bus 1804. In an embodiment of the present application, the processor 1802 is configured to control and manage an action of the first core network device, for example, the processor 1802 is configured to support the first core network device to perform step 402 in fig. 4, step 402-step 403a and step 407a in fig. 7, step 402 and step 406b-407b in fig. 8, or step 402 and step 406 c-step 407c in fig. 9, or to perform step 402 and step 406d in fig. 13, and/or other processes for the techniques described herein. The communication interface 1803 is configured to support communication with a first core network device. A memory 1801 is used for storing program codes and data of the first core network device.

The processor 1802 may be, among other things, a central processing unit, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, transistor logic, a hardware component, or any combination thereof. Which may implement or perform the various illustrative logical blocks, modules, and circuits described in connection with the disclosure. The processor may also be a combination of computing functions, e.g., comprising one or more microprocessors, a digital signal processor and a microprocessor, or the like. Bus 1804 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 18, but this does not mean only one bus or one type of bus.

In another embodiment of the present application, a readable storage medium is further provided, where the readable storage medium stores computer-executable instructions, and when a device (which may be a single chip, a chip, or the like) or a processor executes the steps of the UE in the methods provided in fig. 3 to 14. The readable storage medium may include: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the computer executable instructions may be read by the at least one processor of the apparatus from a computer readable storage medium, and execution of the computer executable instructions by the at least one processor causes the apparatus to perform the steps of the UE in the method provided by any of the diagrams of fig. 3-14.

In another embodiment of the present application, a readable storage medium is further provided, where the readable storage medium stores computer-executable instructions, and when a device (which may be a single chip, a chip, or the like) or a processor executes the steps of the first core network device (for example, SMF) in the methods provided in fig. 3 to fig. 14. The readable storage medium may include: u disk, removable hard disk, read only memory, random access memory, magnetic or optical disk, etc. for storing program codes.

In another embodiment of the present application, there is also provided a computer program product comprising computer executable instructions stored in a computer readable storage medium; the computer-executable instructions may be read by at least one processor of the device from a computer-readable storage medium, and execution of the computer-executable instructions by the at least one processor causes the device to perform the steps of the first core network device (e.g., SMF) of the method provided by any of the diagrams of fig. 3-14.

In another embodiment of the present application, a communication system is further provided, where the communication system includes a UE and a first core network device; wherein the UE may be any one of the UEs provided in fig. 2, fig. 15 or fig. 16, configured to perform the steps of the UE in the method provided in any one of fig. 3-fig. 14; and/or the first core network device may be any one of the core network devices provided in fig. 17 or 18, configured to perform the steps of the first core network device in the method provided in any one of fig. 3 to 14.

In the communication system provided by the embodiment of the application, in the process that the UE moves from the first communication system to the second communication system, when the PDU session of the UE in the first communication system is in a deactivated state, the UE only establishes the default EPS bearer corresponding to the PDU session in the second communication system, so that the problem that the deactivated PDU session is reactivated in the process that the UE moves is avoided, transmission resources are saved, meanwhile, it is also ensured that the IP address of the UE is not released, and user experience is improved. In addition, when the PDU session of the UE in the first communication system is in a deactivated state, the UE and the first core network device may set the first EBI of the dedicated EPS bearer corresponding to the PDU session in the second communication system as unavailable, and when the PDU session is reactivated, allocate the second EBI to the dedicated EPS bearer, so that a problem that the EBI of the EPS bearer of the UE is not enough when the UE moves from the first communication system to the second communication system may be avoided, and user experience is improved.

Finally, it should be noted that: the above description is only an embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions within the technical scope of the present disclosure should be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1.A bearer establishment method, the method comprising:

the method comprises the steps that User Equipment (UE) moves from a first communication system to a second communication system;

when the PDU conversation of the UE in the first communication system is in a deactivation state, the UE establishes a default EPS bearing corresponding to the PDU conversation in the second communication system.

2. The method of claim 1, wherein moving the UE from the first communication system to the second communication system comprises:

and the UE sends a tracking area updating message to core network equipment of the second communication system, wherein the tracking area updating message comprises an EPS bearing state, the default EPS bearing of the PDU session corresponding to the second communication system in the EPS bearing state is marked to be activated, and the special EPS bearing of the PDU session corresponding to the second communication system is marked to be deactivated.

3. The method according to claim 1 or 2, wherein the UE establishes a default EPS bearer corresponding to the PDU session in the second communication system, comprising:

and the UE deletes the special EPS bearing corresponding to the PDU session in the second communication system, and/or deletes the QoS flow corresponding to the special EPS bearing in the PDU session.

4. The method of any of claims 1-2, wherein before the UE moves from the first communication system to the second communication system, the method further comprises:

and when the PDU session is deactivated, the UE sets a first bearer identification (EBI) of the dedicated EPS bearer corresponding to the second communication system in the PDU session as unavailable.

5. The method of claim 4, wherein the UE making the first EBI of the dedicated EPS bearer corresponding to the PDU session unavailable for use by the UE comprises:

the UE deletes the first EBI of the special EPS bearer; alternatively, the first and second electrodes may be,

the UE deactivates the first EBI of the dedicated EPS bearer.

6. The method of claim 5, wherein the UE deleting the first EBI of the dedicated EPS bearer comprises:

the UE deletes a first context, wherein the first context comprises the first EBI, and the first context is the context of the special EPS bearer; alternatively, the first and second electrodes may be,

and the UE deactivates a first context and deletes a first EBI in the first context, wherein the first context is the context of the special EPS bearer.

7. The method of claim 5, wherein the UE deactivating the first EBI of the dedicated EPS bearer comprises:

the UE deactivates a first context, wherein the first context comprises the first EBI, and the first context is the context of the dedicated EPS bearer.

8. The method of claim 6, wherein when the UE deletes a first context that includes the first EBI, the method further comprises:

when the PDU session is activated, the UE receives a first message sent by a first core network device of the first communication system, wherein the first message comprises a second context, and the second context is the context of the special EPS bearing;

the UE allocates a second EBI for the special EPS bearing corresponding to the second context;

and the UE sends the second EBI to the first core network equipment.

9. The method of claim 6, wherein when the UE deactivates a first context and deletes a first EBI in the first context, the method further comprises:

when the PDU session is activated, the UE receives a second message sent by a first core network device of a first communication system, wherein the second message comprises an identification QFI set of QoS flow of the PDU session, and the QFI set corresponds to the special EPS load;

the UE allocates a second EBI for the special EPS bearing corresponding to the QFI set;

and the UE sends the second EBI to the first core network equipment.

10. The method of claim 7, wherein when the UE deactivates a first context comprising the first EBI, the method further comprises:

when the PDU session is activated, the UE receives a third message sent by a first core network device of the first communication system, wherein the third message comprises the first EBI;

the UE allocates a second EBI for the special EPS bearing corresponding to the first EBI;

and the UE sends the second EBI to the first core network equipment.

11. The method of claim 6, wherein when the UE deactivates a first context and deletes a first EBI in the first context, the method further comprises:

when the PDU session is activated, the UE receives a fourth message sent by a first core network device of the first communication system, wherein the fourth message comprises a correspondence relation between an identification QFI set and a second EBI of a QoS flow of the PDU session, the QFI set corresponds to the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer;

the UE determines a correspondence of the second EBI with the first context.

12. The method of claim 7, wherein when the UE deactivates a first context comprising the first EBI, the method further comprises:

when the PDU session is activated, the UE receives a fifth message sent by a first core network device of the first communication system, where the fifth message includes a correspondence between the first EBI and a second EBI, and the second EBI is an EBI allocated to the dedicated EPS bearer;

the UE determines a correspondence of the second EBI with the first context.

13. The method according to any of claims 9-12, wherein when the PDU session is activated, the method further comprises:

and the UE sets the first context to be in an activated state.

14. The method of claim 6, wherein when the UE deletes a first context that includes the first EBI, the method further comprises:

when the PDU session is activated, the UE receives a sixth message sent by a first core network device of the first communication system, wherein the sixth message comprises a second context and a second EBI, the second context is the context of the dedicated EPS bearing, and the second EBI is the EBI allocated to the dedicated EPS bearing;

the UE determines a correspondence of the second EBI and the second context.

15.A bearer establishment method, the method comprising:

when User Equipment (UE) moves from a first communication system to a second communication system, first core network equipment receives a first request sent by second core network equipment, wherein the first request is used for acquiring information of an EPS (evolved packet System) bearer corresponding to the second communication system of a Protocol Data Unit (PDU) session of the UE in the first communication system; the first communication system includes the first core network device and the second core network device;

when the first core network device determines that the PDU session is deactivated, the first core network device sends information of a default EPS bearer corresponding to the PDU session to the second core network device.

16. The method of claim 15, wherein before the first core network device determines that the PDU session is deactivated, the method further comprises:

and the first core network equipment sets a first bearer identifier (EBI) of a special EPS bearer corresponding to the second communication system in the PDU session as unavailable.

17. The method of claim 16, wherein the first core network device setting the first EBI of the dedicated EPS bearer corresponding to the PDU session to unavailable by the first core network device comprises:

the first core network equipment deletes the first EBI of the special EPS bearer; alternatively, the first and second electrodes may be,

and the first core network equipment deactivates the first EBI of the special EPS bearer.

18. The method of claim 17, wherein the deleting, by the first core network device, the first EBI of the dedicated EPS bearer comprises:

the first core network device deletes a first context, wherein the first context comprises the first EBI, and the first context is the context of the special EPS bearer; alternatively, the first and second electrodes may be,

and the first core network equipment deactivates a first context and deletes a first EBI in the first context, wherein the first context is the context of the special EPS bearer.

19. The method of claim 17, wherein the first core network device deactivating the first EBI of the dedicated EPS bearer comprises:

the first core network device deactivates a first context, where the first context includes the first EBI, and the first context is a context of the dedicated EPS bearer.

20. The method of claim 18, wherein when the first core network device deletes a first context including the first EBI, the method further comprises:

when the PDU session is activated, the first core network equipment determines a second context, wherein the second context is the context of the special EPS bearing;

the first core network equipment sends a first message to the UE, wherein the first message comprises the second context;

the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is an EBI of a special EPS bearer corresponding to the second context;

the first core network device determines a correspondence between the second context and the second EBI.

21. The method of claim 18, wherein when the first core network device deactivates a first context and deletes a first EBI in the first context, the method further comprises:

when the PDU session is activated, the first core network equipment sends a second message to the UE, wherein the second message comprises an identification QFI set of QoS flow, and the QFI set corresponds to the special EPS load;

the first core network equipment receives a second EBI sent by the UE, wherein the second EBI is the EBI allocated to the special EPS bearing;

the first core network device determines a correspondence between the first context and the second EBI.

22. The method of claim 19, wherein when the first core network device deactivates a first context that includes the first EBI, the method further comprises:

when the PDU session is activated, the first core network device sending a third message to the UE, wherein the third message comprises the first EBI;

23. The method of claim 18 or 19, further comprising:

when the PDU session is activated, the first core network equipment sends a second request to second core network equipment, wherein the second request is used for requesting to allocate a second EBI for the special EPS bearing;

the first core network device receives the second EBI sent by the second core network device;

and the first core network equipment determines the corresponding relation between the context of the special EPS bearer and the second EBI.

24. The method of claim 21, wherein when the first core network device deactivates a first context and deletes a first EBI in the first context, and after the first core network device receives the second EBI sent by the second core network device, the method further comprises:

and the first core network equipment sends a fourth message to the UE, wherein the fourth message comprises the corresponding relation between the QFI set and the second EBI.

25. The method of claim 23, wherein when the first core network device deactivates a first context including the first EBI, and after the first core network device receives the second EBI sent by the second core network device, the method further comprises:

and the first core network equipment sends a fifth message to the UE, wherein the fifth message comprises the corresponding relation between the first EBI and the second EBI.

26. The method according to claim 24 or 25, wherein when the PDU session is activated, the method further comprises:

and the first core network equipment sets the context of the special EPS bearer to be in an activated state.

27. The method of claim 23, wherein when the first core network device deletes a first context including the first EBI, the method further comprises:

the first core network equipment determines a second context, wherein the second context is the context of the special EPS bearer;

the first core network device sends a sixth message to the UE, where the sixth message includes the second context and the second EBI.

28. A User Equipment (UE), the UE comprising:

a mobile unit for moving the UE from a first communication system to a second communication system;

and the processing unit is used for establishing a default EPS bearer corresponding to the PDU session in the second communication system when the PDU session of the UE in the first communication system is in a deactivated state.

29. The UE of claim 28, wherein the UE further comprises a sending unit, and wherein the mobile unit is specifically configured to:

and sending a tracking area update message to the core network equipment of the second communication system through the sending unit, wherein the tracking area update message comprises an EPS bearing state, the default EPS bearing of the PDU session corresponding to the second communication system in the EPS bearing state is marked to be activated, and the special EPS bearing of the PDU session corresponding to the second communication system is marked to be deactivated.

30. The ue of claim 28 or 29, wherein the processing unit is specifically configured to:

and deleting the special EPS bearing corresponding to the second communication system in the PDU conversation, and/or deleting the QoS flow corresponding to the special EPS bearing in the PDU conversation.

31. The user equipment according to any of claims 28-29, wherein the processing unit is further configured to:

and when the PDU session is deactivated, setting a first bearer identifier (EBI) of the special EPS bearer corresponding to the second communication system in the PDU session as unavailable.

32. The ue of claim 31, wherein the processing unit is specifically configured to:

deleting the first EBI of the special EPS bearing; alternatively, the first and second electrodes may be,

deactivating the first EBI of the dedicated EPS bearer.

33. The ue of claim 32, wherein the processing unit is specifically configured to delete the first EBI of the dedicated EPS bearer, and the processing unit is configured to:

deleting a first context, wherein the first context comprises the first EBI, and the first context is the context of the special EPS bearer; alternatively, the first and second electrodes may be,

deactivating a first context, and deleting a first EBI in the first context, wherein the first context is the context of the dedicated EPS bearer.

34. The ue of claim 32, wherein the processing unit is specifically configured to deactivate the first EBI of the dedicated EPS bearer, and includes:

deactivating a first context, wherein the first context comprises the first EBI, and the first context is the context of the dedicated EPS bearer.

35. The UE of claim 33, wherein when the processing unit is specifically configured to delete a first context including the first EBI,

the UE further comprises: a receiving unit, configured to receive a first message sent by a first core network device of the first communication system when the PDU session is activated, where the first message includes a second context, and the second context is a context of the dedicated EPS bearer;

the processing unit is further configured to allocate a second EBI for the dedicated EPS bearer corresponding to the second context;

the sending unit is further configured to send the second EBI to the first core network device.

36. The UE of claim 33, wherein when the processing unit is specifically configured to deactivate a first context and delete the first EBI included in the first context,

the UE further comprises: a receiving unit, configured to receive a second message sent by a first core network device of a first communication system when the PDU session is activated, where the second message includes an identifier QFI set of a QoS flow of the PDU session, and the QFI set corresponds to the dedicated EPS bearer;

the processing unit is further configured to allocate a second EBI for the dedicated EPS bearer corresponding to the QFI set;

37. The UE of claim 34, wherein when the processing unit is specifically configured to deactivate a first context including the first EBI,

the UE further comprises: a receiving unit, configured to receive a third message sent by a first core network device of the first communication system when the PDU session is activated, where the third message includes the first EBI;

the processing unit is further configured to allocate a second EBI for the dedicated EPS bearer corresponding to the first EBI;

38. The UE of claim 33, wherein when the processing unit is specifically configured to deactivate a first context and delete the first EBI included in the first context,

the UE further comprises: a receiving unit, configured to receive a fourth message sent by a first core network device of the first communication system when the PDU session is activated, where the fourth message includes a correspondence between a QFI set and a second EBI of a QoS flow of the PDU session, the QFI set corresponds to the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer;

the UE determines a correspondence of the second EBI with the first context.

39. The UE of claim 33, wherein when the processing unit is configured to deactivate a first context including the first EBI,

the UE further comprises: a receiving unit, configured to receive a fifth message sent by a first core network device of the first communication system when the PDU session is activated, where the fifth message includes a correspondence between the first EBI and a second EBI, and the second EBI is an EBI allocated to the dedicated EPS bearer;

the processing unit is further configured to determine a correspondence between the second EBI and the first context.

40. The UE of any of claims 36-39, wherein when the PDU session is activated, the processing unit is further configured to:

and setting the first context into an activated state.

41. The UE of claim 33, wherein when the processing unit is specifically configured to delete a first context including the first EBI,

the UE further comprises: a receiving unit, configured to receive a sixth message sent by a first core network device of the first communication system when the PDU session is activated, where the sixth message includes a second context and a second EBI, the second context is a context of the dedicated EPS bearer, and the second EBI is an EBI allocated to the dedicated EPS bearer;

the processing unit is further configured to determine a correspondence between the second EBI and the second context.

42. A core network device, wherein the core network device as a first core network device includes:

a receiving unit, configured to receive a first request sent by a second core network device when a user equipment UE moves from a first communication system to a second communication system, where the first request is used to obtain information that a PDU session of the UE in the first communication system corresponds to an EPS bearer of the second communication system; the first communication system includes the first core network device and the second core network device;

a sending unit, configured to send, to the second core network device, information that the PDU session corresponds to a default EPS bearer of the second communication system when the first core network device determines that the PDU session is deactivated.

43. The core network device of claim 42, wherein the core network device further comprises:

and the processing unit is used for setting the first bearer identifier EBI of the special EPS bearer corresponding to the second communication system in the PDU session as unavailable.

44. The core network device of claim 43, wherein the processing unit is specifically configured to:

deactivating the first EBI of the dedicated EPS bearer.

45. The core network device of claim 44, wherein the processing unit is specifically configured to delete the first EBI of the dedicated EPS bearer, and includes:

46. The core network device of claim 44, wherein the processing unit is specifically configured to deactivate the first EBI of the dedicated EPS bearer, and includes:

47. The core network device according to claim 45, wherein when the processing unit is specifically configured to delete a first context including the first EBI,

the processing unit is further configured to determine a second context when the PDU session is activated, where the second context is a context of the dedicated EPS bearer;

the sending unit is further configured to send a first message to the UE, where the first message includes the second context;

the receiving unit is further configured to receive a second EBI sent by the UE, where the second EBI is an EBI of a dedicated EPS bearer corresponding to the second context;

the processing unit is further configured to determine a correspondence between the second context and the second EBI.

48. The core network device according to claim 45, wherein when the processing unit is specifically configured to deactivate a first context and delete a first EBI in the first context,

the sending unit is further configured to send a second message to the UE when the PDU session is activated, where the second message includes an identifier QFI set of QoS flows, and the QFI set corresponds to the dedicated EPS bearer;

the receiving unit is further configured to receive a second EBI sent by the UE, where the second EBI is an EBI allocated to the dedicated EPS bearer;

the processing unit is further configured to determine a correspondence between the first context and the second EBI.

49. The core network device according to claim 46, wherein when the processing unit is specifically configured to deactivate a first context, which includes the first EBI,

the sending unit is further configured to send a third message to the UE when the PDU session is activated, where the third message includes the first EBI;

50. Core network device according to claim 45 or 46,

the sending unit is further configured to send a second request to a second core network device when the PDU session is activated, where the second request is used to request allocation of a second EBI for the dedicated EPS bearer;

the receiving unit is further configured to receive the second EBI sent by the second core network device;

the processing unit is further configured to determine a correspondence between the context of the dedicated EPS bearer and the second EBI.

51. The core network device according to claim 48, wherein when the processing unit is specifically configured to deactivate a first context and delete a first EBI in the first context,

the sending unit is further configured to send a fourth message to the UE, where the fourth message includes a correspondence between the QFI set and the second EBI.

52. The core network device according to claim 50, wherein when the processing unit is specifically configured to deactivate a first context including the first EBI,

the sending unit is further configured to send a fifth message to the UE, where the fifth message includes a correspondence between the first EBI and the second EBI.

53. The core network device according to claim 51 or 52, wherein when the PDU session is activated, the processing unit is further configured to:

and setting the context of the special EPS bearing to be an activated state.

54. The core network device according to claim 50, wherein when the processing unit is specifically configured to delete a first context including the first EBI,

the processing unit is further configured to determine a second context, where the second context is a context of the dedicated EPS bearer;

the sending unit is further configured to send a sixth message to the UE, where the sixth message includes the second context and the second EBI.

55. A user equipment, the user equipment comprising: a memory having code and data stored therein, and a processor executing the code in the memory to cause the user equipment to perform the bearer establishment method of any of claims 1-14 above.

56. A core network device, wherein the core network device as a first core network device includes: a memory having code and data stored therein, and a processor executing the code in the memory to cause the core network device to perform the bearer establishment method of any of claims 15-27.

57. A readable storage medium having stored therein instructions, which, when run on an apparatus, cause the apparatus to perform the bearer establishment method of any one of claims 1-14 above or to perform the bearer establishment method of any one of claims 15-27 above.