Method and device for moving between communication systems

Abstract

An embodiment of the present application provides a method and apparatus for inter-communication system mobility, relating to the field of communication technology, and is used to move a user equipment from a first communication system to a second communication system. The method includes: the UE receives a first message, the first message is used to establish or modify a first EPS bearer for the UE within the first communication system, the first message includes first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer; the UE saves the first QoS flow information; the UE moves from the first communication system to the second communication system; the UE determines the QoS flow information used by the UE in the second communication system according to a first condition, the first condition including the first QoS flow information.

Description

[0001] This application claims priority to PCT patent application number PCT / CN2017 / 083522, filed with the Patent Office of China on May 8, 2017, entitled “A Method and Apparatus for Mobility between Communication Systems,” the entire contents of which are incorporated herein by reference. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a method and apparatus for inter-communication system mobility. Background Art

[0003] With the rapid development of communication technology, a variety of user equipment (UE) such as smartphones, tablets, and portable devices have emerged. These UEs can simultaneously support different generations of mobile communication networks and can switch between different generations of mobile communication networks. The fifth generation (5G) mobile communication technology is an extension of the fourth generation (4G) mobile communication technology. It has characteristics such as high performance, low latency, and high capacity. Its maximum data transmission speed can reach more than tens of Gbps, which is 1000 times faster than the data transmission speed of the existing fourth generation (4G) network. Therefore, when a UE is on a 4G network and supports a 5G network, the UE can switch from the 4G network to the 5G network to obtain higher data transmission speeds.

[0004] In the prior art, a UE can move from a 4G network to a 3G network. This is because the EPS bearer of the UE in the 4G network is mapped one-to-one with the PDP context of the 3G network, and the QoS parameters of the 4G network are also mapped one-to-one with the QoS parameters of the 3G network. Therefore, the UE can directly move from the 4G network to the 3G network. The mobility mentioned here includes two situations: when the UE is in the idle state, it reselects to the 3G network; when the UE is in the connected state, it switches to the 3G network. Specifically, when the UE is in the idle state, the UE can send a Non-Access Stratus (NAS) Routing Area Update (RAU) signaling to the SGSN, so that the UE and the PGW can map the QoS context locally, and the UE maps the EPS bearer context to the PDP context. When the UE is in the connected state, after receiving the handover instruction from the 4G base station, the UE can map the QoS context locally.

[0005] However, since the QoS flow in the 5G network replaces the EPS bearer in the 4G network, and the QoS flow and the EPS bearer are not mapped one-to-one, and the QoS parameters are not mapped one-to-one, it is impossible to move the UE from the 4G network to the 5G network according to the method of moving the UE from the 4G network to the 3G network. Summary of the Invention

[0006] Embodiments of the present application provide a method and apparatus for inter-communication system mobility, for moving a UE from a first communication system to a second communication system.

[0007] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0008] In a first aspect, a method for inter-communication system mobility is provided for moving a user equipment (UE) from a first communication system to a second communication system, the method comprising: the UE receiving a first message, the first message being used to establish or modify a first EPS bearer for the UE within the first communication system, the first message comprising first quality of service (QoS) flow information of the second communication system corresponding to the first EPS bearer; the UE saving the first QoS flow information and moving from the first communication system to the second communication system, for example, the UE moving from a 4G communication system to a 5G communication system; the UE determining the QoS flow information used by the UE in the second communication system based on a first condition, the first condition including the first QoS flow information. In the above technical solution, the UE can directly activate the saved first QoS flow information after moving from the first communication system to the second communication system by saving the first QoS flow information in advance, thereby moving the UE to the second communication system, and having corresponding QoS context information in the second communication system to ensure normal and uninterrupted service.

[0009] In conjunction with the first aspect, in a first possible implementation of the first aspect, before the UE receives the first message, the method further includes: during the process of establishing a PDN connection within the first communication system, the UE sends first information to the first core network entity, where the first information is used by the first core network entity to determine that the PDN connection can be moved from the first communication system to the second communication system. In the above possible technical solution, the UE uses the first information to enable the first core network entity to determine that the PDN connection can be moved to the second communication system, thereby causing the first core network entity to send first QoS flow information to the UE.

[0010] In combination with the first possible implementation of the first aspect, in the second possible implementation of the first aspect, the first information includes information for indicating that the PDN connection can be moved to the second communication system; or, the first information includes information for indicating that the service and session continuity (SSC) mode of the PDU session corresponding to the PDN connection in the second communication system is a specified mode.

[0011] In combination with the first aspect, in a third possible implementation of the first aspect, before the UE receives the first message, the method also includes: during the process of the UE establishing a PDN connection within the first communication system, the UE sends second information to the first core network entity, and the second information is used to indicate the SSC mode of the PDN connection corresponding to the PDU session in the second communication system.

[0012] In combination with any one of the first aspect to the third possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the first quality of service QoS flow information includes one or more QoS rules.

[0013] In combination with any one of the first aspect to the fourth possible implementation of the first aspect, in the fifth possible implementation of the first aspect, the first EPS bearer is the default bearer; the first quality of service QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, QoS rules.

[0014] In combination with any one of the first aspect to the fifth possible implementation of the first aspect, in the sixth possible implementation of the first aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0015] In combination with the first aspect, in the seventh possible implementation of the first aspect, the method also includes: the UE obtains an identifier of the first QoS flow, and the identifier of the first QoS flow is obtained by the UE adding a specific value to the identifier of the first EPS bearer; or, the identifier of the first QoS flow is obtained by the UE adding a specific field to the identifier of the first EPS bearer.

[0016] In combination with any possible implementation manner of the first aspect to the seventh possible implementation manner of the first aspect, in the eighth possible implementation manner of the first aspect, the UE saves the first QoS flow information, including: the UE saves the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information; or, the UE saves the correspondence between the first EPS bearer context and the first QoS flow information; or, the UE saves the correspondence between the first EPS bearer context and the index information of the first QoS flow, and the index information includes the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier.

[0017] In combination with any possible implementation manner of the first aspect to the eighth possible implementation manner of the first aspect, in the ninth possible implementation manner of the first aspect, the UE moves from the first communication system to the second communication system, including: the UE sends first EPS bearer status information to the second core network entity, the second core network entity is a core network entity in the second communication system responsible for UE access and mobility management, the first EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state and has corresponding QoS flow information; the UE receives a second message sent by the second core network entity, the second message includes second EPS bearer status information, the second EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state and has corresponding QoS flow information determined by the second core network entity; accordingly, the first condition also includes the second EPS bearer status information. In the above possible technical solution, the UE ensures that after the UE moves to the second communication system, the status or number of QoS flows recorded by the UE and the network remain consistent by reporting the first EPS bearer status information.

[0018] In combination with any possible implementation manner of the first aspect to the eighth possible implementation manner of the first aspect, in the tenth possible implementation manner of the first aspect, the UE moves from the first communication system to the second communication system, including: the UE sends first QoS flow status information to the second core network entity, the second core network entity is a core network entity in the second communication system responsible for UE access and mobility management, the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state; the UE receives a second message sent by the second core network entity, the second message includes second QoS flow status information, the second QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state determined by the second core network entity; accordingly, the first condition also includes the second QoS flow status information. In the above possible technical solution, the UE ensures that after the UE moves to the second communication system, the status or number of QoS flows recorded by the UE and the network remain consistent by reporting the first QoS flow status information.

[0019] In combination with any possible implementation manner of the first aspect to the tenth possible implementation manner of the first aspect, in the eleventh possible implementation manner of the first aspect, the UE moves from the first communication system to the second communication system, including: the UE receives a handover instruction sent by the base station of the first communication system, the handover instruction including a session identifier and a QoS flow identifier; accordingly, the first condition also includes the session identifier and the QoS flow identifier. In the above possible technical solutions, the UE ensures that the status or number of QoS flows recorded by the UE and the network remain consistent through the received session identifier and QoS flow identifier.

[0020] In combination with any possible implementation manner of the first aspect to the eleventh possible implementation manner of the first aspect, in the twelfth possible implementation manner of the first aspect, after the UE receives the first message and before the UE moves from the first communication system to the second communication system, the method further includes: the UE receiving a fourth message, the fourth message being used to delete the first EPS bearer; and the UE deleting the first EPS bearer and the first QoS flow information corresponding to the first EPS bearer. In the above possible technical solution, the UE ensures that the status or number of QoS flows recorded by the UE and the network remain consistent by deleting the first QoS flow information corresponding to the first EPS bearer.

[0021] In conjunction with any possible implementation manner of the first aspect to the twelfth possible implementation manner of the first aspect, in the thirteenth possible implementation manner of the first aspect, the first QoS flow information is included in a protocol configuration option (PCO). In the above possible technical solution, the UE ensures minimal changes to the existing first communication system by receiving the first QoS flow information carried by the PCO.

[0022] In combination with the first or second possible implementation manner of the first aspect, in a fourteenth possible implementation manner of the first aspect, the first information is included in a protocol configuration option (PCO). In the above possible technical solution, the UE sends the carried first QoS flow information through the PCO, ensuring minimal changes to the existing first communication system.

[0023] With reference to the third possible implementation manner of the first aspect, in a fifteenth possible implementation manner of the first aspect, the second information is included in a protocol configuration option PCO.

[0024] In combination with any possible implementation manner of the first aspect to the fifteenth possible implementation manner of the first aspect, in the sixteenth possible implementation manner of the first aspect, the UE saves the first QoS flow information, including: the UE saves the first QoS flow information in the context of the first EPS bearer; or, the UE saves the index information of the first QoS flow information in the context information of the first EPS bearer, and the index information includes the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier.

[0025] In combination with any possible implementation manner of the first aspect to the sixteenth possible implementation manner of the first aspect, in the seventeenth possible implementation manner of the first aspect, after the UE determines the QoS flow information used by the UE in the second communication system according to the first condition, the method also includes: the UE deletes the context of the second EPS bearer, and the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the UE.

[0026] In combination with any possible implementation manner of the first aspect to the seventeenth possible implementation manner of the first aspect, in the eighteenth possible implementation manner of the first aspect, the UE moves from the first communication system to the second communication system, including: the UE receives a switching command, the switching command contains index information of one or more QoS flows, the index information includes a QoS flow identifier, or a combination of a QoS flow identifier and a PDU session identifier; the UE moves from the first communication system to the second communication system according to the switching command.

[0027] In combination with the eighteenth possible implementation manner of the first aspect, in the nineteenth possible implementation manner of the first aspect, the UE determines the QoS flow information used by the UE in the second communication system according to the first condition, including: the UE associating the currently used EPS bearer with the index information of the QoS flow included in the switching command; the UE deletes the EPS bearer in the currently used EPS bearer that cannot be associated with the index information of the QoS flow.

[0028] In combination with the nineteenth possible implementation manner of the first aspect, in the twentieth possible implementation manner of the first aspect, the UE associates the currently used EPS bearer with the index information of the QoS flow contained in the switching command, including: the UE obtains the EPS bearer context corresponding to the index information of the QoS flow; or, the UE obtains the EPS bearer identifier corresponding to the index information of the QoS flow.

[0029] In combination with any possible implementation of the first aspect to the twentieth possible implementation of the first aspect, in the twenty-first possible implementation of the first aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0030] According to a second aspect, a method for inter-communication system mobility is provided for moving a user equipment UE from a first communication system to a second communication system, the method comprising: a first core network entity determines first quality of service (QoS) flow information of a second communication system corresponding to a first EPS bearer of the UE in the first communication system; the first core network entity sends a first message, the first message being used to establish or modify a first EPS bearer for the UE within the first communication system, the first message including the first QoS flow information; the first core network entity saves the first QoS flow information; when the UE moves from the first communication system to the second communication system, the first core network entity determines the QoS flow information used by the UE in the second communication system according to a fourth condition, the fourth condition including the first QoS flow information.

[0031] In combination with the second aspect, in a first possible implementation of the second aspect, before the first core network entity determines the first QoS flow information of the second communication system corresponding to the first EPS bearer of the UE in the first communication system, the method also includes: the first core network entity receives the first information sent by the UE during the process of establishing a PDN connection within the first communication system; the first core network entity determines, based on the first information, that the PDN connection can be moved from the first communication system to the second communication system.

[0032] In combination with the first possible implementation of the second aspect, in the second possible implementation of the second aspect, the first information includes information for indicating that the PDN connection can be moved to the second communication system; or, the first information includes information for indicating that the service and session continuity (SSC) mode of the PDU session corresponding to the PDN connection in the second communication system is a specified mode.

[0033] In combination with the second aspect, in a third possible implementation of the second aspect, before the first core network entity sends the first message, the method also includes: during the process of the first core network entity establishing a PDN connection within the first communication system, receiving second information sent by the UE, the second information being used to indicate the SSC mode of the PDN connection corresponding to the PDU session in the second communication system.

[0034] In combination with any possible implementation manner of the second aspect to the third possible implementation manner of the second aspect, in a fourth possible implementation manner of the second aspect, the first quality of service QoS flow information includes one or more QoS rules.

[0035] In combination with any possible implementation of the second aspect to the fourth possible implementation of the second aspect, in the fifth possible implementation of the second aspect, the first EPS bearer is the default bearer; the first quality of service QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, QoS rules.

[0036] In combination with the fourth or fifth possible implementation of the second aspect, in the sixth possible implementation of the second aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0037] In combination with the second aspect, in the seventh possible implementation of the second aspect, the method also includes: the first core network entity obtains the identifier of the first QoS flow, and the identifier of the first QoS flow is obtained by the UE adding a specific value to the identifier of the first EPS bearer; or, the identifier of the first QoS flow is obtained by the UE adding a specific field to the identifier of the first EPS bearer.

[0038] In combination with any possible implementation manner of the second aspect to the seventh possible implementation manner of the second aspect, in the eighth possible implementation manner of the second aspect, the first core network entity determines the first QoS flow information of the second communication system corresponding to the first EPS bearer of the UE in the first communication system, including: the first message is used to establish a first EPS bearer for the UE within the first communication system, and the first core network entity maps the context of the first EPS bearer to the first QoS flow information of the second communication system; or, the first message is used to modify the first EPS bearer for the UE within the first communication system, and the first core network entity maps the context of the modified first EPS bearer to the first QoS flow information of the second communication system.

[0039] In combination with the eighth possible implementation manner of the second aspect, in the ninth possible implementation manner of the second aspect, the first message is used to establish a first EPS bearer for the UE within the first communication system, and the method also includes: the first core network entity assigns a QoS flow identifier to the UE; or, maps the bearer identifier of the first EPS bearer to a QoS flow identifier.

[0040] In combination with the eighth possible implementation manner of the second aspect, in the tenth possible implementation manner of the second aspect, the first message is used to modify the first EPS bearer for the UE within the first communication system, and the method also includes: the first core network entity determines that the first EPS bearer has corresponding first QoS flow information of the second communication system.

[0041] In combination with the second aspect to the tenth possible implementation manner of the second aspect, in the eleventh possible implementation manner of the second aspect, the first core network entity saves the first QoS flow information, including: the first core network entity saves the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information; or, the first core network entity saves the correspondence between the first EPS bearer context and the first QoS flow information; or, the first core network entity saves the correspondence between the first EPS bearer context and the index information of the first QoS flow, and the index information includes the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier; or, the UE saves the correspondence between the first EPS bearer and the first QoS flow; or, the UE saves the correspondence between the first EPS bearer and the index information of the first QoS flow, and the index information includes the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier.

[0042] In combination with the eleventh possible implementation manner of the second aspect, in the twelfth possible implementation manner of the second aspect, the method also includes: the first core network entity receives second information sent by the second core network entity; wherein the second information includes a link bearer identifier and a bearer identifier that can be moved to the second communication system, or includes a PDN connection context, and the PDN connection uplink includes an EPS bearer context that can be moved to the second communication system; the second core network entity is a core network entity in the second communication system responsible for UE access and mobility management; the first core network entity generates second QoS flow information of the second communication system according to the fifth condition, and the second QoS flow information includes the QoS flow information corresponding to the EPS bearer of the UE in an activated state determined by the second core network entity; the fifth condition includes the second information, and the corresponding relationship.

[0043] In combination with the twelfth possible implementation manner of the second aspect, in the thirteenth possible implementation manner of the second aspect, the method also includes: the first core network entity receives the PDN connection context and first QoS flow status information sent by the second core network entity, the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state; the first core network entity generates second QoS flow information of the second communication system according to the fifth condition, the second QoS flow information includes the QoS flow corresponding to the EPS bearer of the UE in the activated state determined by the second core network entity; the fifth condition includes the first QoS flow information, and the corresponding relationship.

[0044] In combination with any one of the second aspect to the thirteenth possible implementation manner of the second aspect, in a fourteenth possible implementation manner of the second aspect, the first QoS flow information is included in a protocol configuration option PCO.

[0045] With reference to the first or second possible implementation manner of the second aspect, in a fifteenth possible implementation manner of the second aspect, the first information is included in a protocol configuration option PCO.

[0046] With reference to the third possible implementation manner of the second aspect, in a sixteenth possible implementation manner of the second aspect, the second information is included in a protocol configuration option PCO.

[0047] In combination with any one of the second aspect to the sixteenth possible implementation manner of the second aspect, in the seventeenth possible implementation manner of the second aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0048] According to a third aspect, a method for inter-communication system mobility is provided for moving a user equipment (UE) from a first communication system to a second communication system, the method comprising: when the UE moves from the first communication system to the second communication system, the second core network entity obtains first status information and a PDN connection context, the second core network entity being a core network entity in the second communication system responsible for access and mobility management of the UE; the second core network entity determines second information according to a sixth condition, the second information being used by the first core network entity to determine the QoS flow information used by the UE in the second communication system, the sixth condition including the first status information and the PDN connection context; the second core network entity sends second information to the first core network entity, and receives third information sent by the first core network entity; the second core network entity generates second status information according to a seventh condition, the seventh condition including the third information; the second core network entity sends a second message to the UE, the second message including second status information, the second status information being used by the UE to determine the QoS flow information used in the second communication system.

[0049] In combination with the third aspect, in a first possible implementation method of the third aspect, the first status information is the first EPS bearer status information, and the second status information is the second EPS bearer status information; wherein, the first EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state and has corresponding QoS flow information, and the second EPS bearer status information is used to identify the EPS bearer of the UE that is determined by the second core network entity to be in an activated state and has corresponding QoS flow information.

[0050] In combination with the third aspect, in a second possible implementation of the third aspect, the first status information is first QoS flow status information, and the second status information is second QoS flow status information; wherein, the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state, and the second QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state determined by the second core network entity.

[0051] In combination with the first possible implementation manner of the third aspect, in the third possible implementation manner of the third aspect, the third information includes the bearer identifier of the EPS bearer of the UE in the activated state determined by the first core network entity; or, the third information includes the second QoS flow status information determined by the first core network entity.

[0052] In combination with the first possible implementation method of the third aspect, in a fourth possible implementation method of the third aspect, the second core network entity determines the second information based on the first status information and the PDN connection context, including: the second core network entity determines the second information based on the intersection of the first EPS bearer status information and the EPS bearer existing in the PDN connection context; wherein the second information includes a link bearer identifier and a bearer identifier that can be moved to the second communication system, or includes the PDN connection context, and the PDN connection uplink includes an EPS bearer context that can be moved to the second communication system.

[0053] In combination with the second possible implementation method of the third aspect, in the fifth possible implementation method of the third aspect, the second core network entity determines the second information based on the first status information and the PDN connection context, including: the second core network entity maps the PDN connection context to the QoS flow information of the second communication system, and determines the second information based on the intersection of the mapped QoS flow information and the QoS flow in the status information of the first QoS flow, where the second information includes the second QoS flow status information.

[0054] In combination with any possible implementation of the third aspect to the fifth possible implementation of the third aspect, in the sixth possible implementation of the third aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or, the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0055] In a fourth aspect, a method for mobility between communication systems is provided, for moving a user equipment UE from a first communication system to a second communication system, the method comprising: the UE establishing a first EPS bearer within the first communication system; the UE moving from the first communication system to the second communication system; the UE receiving a first message, the first message including first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer; the UE determining the QoS flow information used by the UE in the second communication system based on a first condition, the first condition including the first QoS flow information.

[0056] In combination with the fourth aspect, in a first possible implementation of the fourth aspect, the first quality of service QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, and QoS rules.

[0057] In combination with the first possible implementation of the fourth aspect, in the second possible implementation of the fourth aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0058] In combination with the fourth aspect, in a third possible implementation of the fourth aspect, the method further includes: the UE obtains an identifier of the first QoS flow; the identifier of the first QoS flow is obtained by the UE adding a specific value to the identifier of the first EPS bearer, or the identifier of the first QoS flow is obtained by the UE adding a specific field to the identifier of the first EPS bearer.

[0059] In combination with any one of the fourth aspect to the third possible implementation manner of the fourth aspect, in the fourth possible implementation manner of the fourth aspect, the UE moves from the first communication system to the second communication system, including: the UE sends first EPS bearer status information to the second core network entity, the first EPS bearer status information is used to identify the EPS bearer of the UE in an activated state, and the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE.

[0060] In combination with any one of the fourth aspect to the third possible implementation manner of the fourth aspect, in the fifth possible implementation manner of the fourth aspect, the UE moves from the first communication system to the second communication system, including: the UE sends first QoS flow status information to the second core network entity, the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE, and the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state.

[0061] In combination with the fourth aspect, in a sixth possible implementation of the fourth aspect, the first message is a registration acceptance message, and the N1 session management information parameter of the registration acceptance message includes the first QoS flow information; or, the first message is a PDU session modification message, and the N1 session management information parameter of the PDU session modification message includes the first QoS flow information.

[0062] In combination with the fourth aspect, in a seventh possible implementation manner of the fourth aspect, the first message is a switching command message, and the switching command message includes the first QoS flow information.

[0063] In combination with the seventh possible implementation manner of the fourth aspect, in an eighth possible implementation manner of the fourth aspect, the target-to-source transparent container of the switching command message includes the first QoS flow information.

[0064] In combination with the eighth possible implementation manner of the fourth aspect, in a ninth possible implementation manner of the fourth aspect, the access layer of the UE obtains the first QoS flow information from the target-to-source transparent container and sends it to the non-access layer of the UE.

[0065] In combination with any possible implementation manner of the fourth aspect to the ninth possible implementation manner of the fourth aspect, in a tenth possible implementation manner of the fourth aspect, the first message also includes information of a first EPS bearer corresponding to the first QoS flow information.

[0066] In combination with the tenth possible implementation manner of the fourth aspect, in an eleventh possible implementation manner of the fourth aspect, the information of the first EPS bearer includes a bearer identifier of the first EPS bearer.

[0067] In combination with the tenth or eleventh possible implementation manner of the fourth aspect, in the twelfth possible implementation manner of the fourth aspect, after the UE determines the QoS flow information used by the UE in the second communication system according to the first condition, the method also includes: the UE deletes the context of the second EPS bearer, and the second EPS bearer is an EPS bearer of the UE that is not included in the first message; or, the second EPS bearer is an EPS bearer of the UE that does not correspond to any QoS flow information.

[0068] In combination with any possible implementation of the fourth aspect to the twelfth possible implementation of the fourth aspect, in the thirteenth possible implementation of the fourth aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0069] In a fifth aspect, a method for mobility between communication systems is provided, for moving a user equipment UE from a first communication system to a second communication system, the method comprising: when the UE moves from the first communication system to the second communication system, the first core network entity receives first information sent by the second core network entity, the first information including a PDN connection context, and the PDN connection uplink includes an EPS bearer context that can be moved to the second communication system; the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE; the first core network entity determines the QoS flow information used by the UE in the second communication system based on a first condition, and the first condition includes the PDN connection context.

[0070] Alternatively, the method includes: when the UE moves from the first communication system to the second communication system, the first core network entity receives second information sent by the second core network entity, the second information including a PDN connection that can be moved to the second communication system and QoS flow status information corresponding to the PDN; the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE; the first core network entity determines the QoS flow information used by the UE in the second communication system based on a first condition, the first condition including the PDN connection and the QoS flow status information. Furthermore, the PDN connection includes all PDN connections of the UE in the first communication system, and the method also includes: the first core network entity deletes the QoS flows that are not in the QoS flow status information in the QoS flows corresponding to the EPS bearer of the PDN connection.

[0071] In combination with the fifth aspect, in a first possible implementation of the fifth aspect, the QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, and QoS rules.

[0072] In combination with the first possible implementation of the fifth aspect, in the second possible implementation of the fifth aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0073] In combination with any one of the fifth aspect to the second possible implementation of the fifth aspect, in the third possible implementation of the fifth aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0074] In the sixth aspect, a method for mobility between communication systems is provided, for moving a user equipment UE from a first communication system to a second communication system, the method comprising: when the UE moves from the first communication system to the second communication system, the second core network entity receives the first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer established by the UE in the first communication system; the second core network entity sends a first message to the UE, and the first message includes the first QoS flow information.

[0075] In combination with the sixth aspect, in a first possible implementation of the sixth aspect, the first QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, and QoS rules.

[0076] In combination with the first possible implementation of the sixth aspect, in the second possible implementation of the sixth aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0077] In combination with any one of the sixth aspect to the second possible implementation manner of the sixth aspect, in the third possible implementation manner of the sixth aspect, the method also includes: the second core network entity obtains first EPS bearer status information and PDN connection context, and the first EPS bearer status information is used to identify the EPS bearer of the UE in an activated state; the second core network entity determines third information based on the first EPS bearer status information and the PDN connection context, and the third information includes a PDN connection that can be moved to the second communication system and an EPS bearer within the PDN connection, or a PDN connection context that can be moved to the second communication system.

[0078] In combination with any one of the sixth aspect to the second possible implementation manner of the sixth aspect, in the fourth possible implementation manner of the sixth aspect, the method also includes: the second core network entity obtains first QoS flow status information and PDN connection context, and the first QoS flow status information is used to identify the QoS flow corresponding to the activated EPS bearer of the UE; the second core network entity sends the first QoS flow status information and PDN connection context to the first core network entity, and receives the second QoS flow information sent by the first core network entity, and the second QoS flow information is used to identify the QoS flow corresponding to the activated EPS bearer of the UE determined by the first core entity.

[0079] In combination with the sixth aspect, in a fifth possible implementation of the sixth aspect, the first message is a registration acceptance message, and the N1 session management information parameter of the registration acceptance message includes the first QoS flow information; or, the first message is a PDU session modification message, and the N1 session management information parameter of the PDU session modification message includes the first QoS flow information.

[0080] In combination with the sixth aspect, in a sixth possible implementation manner of the sixth aspect, the first message is a switching command message, and the switching command message includes the first QoS flow information.

[0081] In combination with the sixth possible implementation manner of the sixth aspect, in a seventh possible implementation manner of the sixth aspect, the target-to-source transparent container of the switching command message includes the first QoS flow information.

[0082] In combination with any possible implementation manner of the sixth aspect to the seventh possible implementation manner of the sixth aspect, in an eighth possible implementation manner of the sixth aspect, the first message also includes information of the first EPS bearer corresponding to the first QoS flow information.

[0083] In combination with the eighth possible implementation manner of the sixth aspect, in a ninth possible implementation manner of the sixth aspect, the information of the first EPS bearer includes a bearer identifier of the first EPS bearer.

[0084] In combination with any possible implementation of the sixth aspect to the ninth possible implementation of the sixth aspect, in the tenth possible implementation of the sixth aspect, the first communication system is a fourth-generation communication system, and the second communication system is a fifth-generation communication system.

[0085] In the seventh aspect, a user equipment UE is provided, which is used to move the UE from a first communication system to a second communication system, and the UE includes: a receiving unit, which is used to receive a first message, the first message is used to establish or modify a first EPS bearer for the UE within the first communication system, and the first message includes first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer; a saving unit, which is used to save the first QoS flow information; a moving unit, which is used to move from the first communication system to the second communication system; and a determining unit, which is used to determine the QoS flow information used by the UE in the second communication system according to a first condition, and the first condition includes the first QoS flow information.

[0086] In combination with the seventh aspect, in a first possible implementation of the seventh aspect, before the UE receives the first message, the UE also includes: a sending unit, used to send first information to the first core network entity during the process of establishing a PDN connection within the first communication system, and the first information is used by the first core network entity to determine that the PDN connection can be moved from the first communication system to the second communication system.

[0087] In combination with the first possible implementation of the seventh aspect, in the second possible implementation of the seventh aspect, the first information includes information for indicating that the PDN connection can be moved to the second communication system; or, the first information includes information for indicating that the service and session continuity (SSC) mode of the PDU session corresponding to the PDN connection in the second communication system is a specified mode.

[0088] In combination with the seventh aspect, in a third possible implementation of the seventh aspect, the UE also includes: a sending unit, used to send second information to the first core network entity during the process of establishing a PDN connection within the first communication system, and the second information is used to indicate the SSC mode of the PDN connection corresponding to the PDU session in the second communication system.

[0089] In combination with any one of the seventh aspect to the third possible implementation manner of the seventh aspect, in a fourth possible implementation manner of the seventh aspect, the first quality of service QoS flow information includes one or more QoS rules.

[0090] In combination with any one of the seventh aspect to the fourth possible implementation of the seventh aspect, in the fifth possible implementation of the seventh aspect, the first EPS bearer is the default bearer; the first quality of service QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, QoS rules.

[0091] In combination with any one of the fifth possible implementations of the seventh aspect to the seventh aspect, in the sixth possible implementation of the seventh aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0092] In combination with the seventh aspect, in a seventh possible implementation of the seventh aspect, the determination unit is further used to obtain an identifier of the first QoS flow, where the identifier of the first QoS flow is obtained by the UE adding a specific value to the identifier of the first EPS bearer; or, the identifier of the first QoS flow is obtained by the UE adding a specific field to the identifier of the first EPS bearer.

[0093] In combination with any possible implementation manner of the seventh aspect to the seventh possible implementation manner of the seventh aspect, in the eighth possible implementation manner of the seventh aspect, the saving unit is specifically used to: save the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information; or, save the correspondence between the first EPS bearer context and the first QoS flow information; or, save the correspondence between the first EPS bearer context and the index information of the first QoS flow, the index information including the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier.

[0094] In combination with any possible implementation manner of the seventh aspect to the eighth possible implementation manner of the seventh aspect, in the ninth possible implementation manner of the seventh aspect, the sending unit is further used to send first EPS bearer status information to the second core network entity, the second core network entity is a core network entity in the second communication system responsible for UE access and mobility management, and the first EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state and has corresponding QoS flow information; the receiving unit is also used to receive a second message sent by the second core network entity, the second message includes second EPS bearer status information, and the second EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state and has corresponding QoS flow information determined by the second core network entity; accordingly, the first condition also includes the second EPS bearer status information.

[0095] In combination with any possible implementation manner of the seventh aspect to the eighth possible implementation manner of the seventh aspect, in the tenth possible implementation manner of the seventh aspect, the sending unit is further used to send first QoS flow status information to the second core network entity, the second core network entity is a core network entity in the second communication system responsible for UE access and mobility management, and the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state; the receiving unit is also used to receive a second message sent by the second core network entity, the second message includes second QoS flow status information, and the second QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state determined by the second core network entity; accordingly, the first condition also includes the second QoS flow status information.

[0096] In combination with any possible implementation manner of the seventh aspect to the tenth possible implementation manner of the seventh aspect, in the eleventh possible implementation manner of the seventh aspect, the receiving unit is also used to receive a switching instruction sent by the base station of the first communication system, and the switching instruction includes a session identifier and a QoS flow identifier; accordingly, the first condition also includes a session identifier and a QoS flow identifier.

[0097] In combination with any possible implementation of the seventh aspect to the eleventh possible implementation of the seventh aspect, in the twelfth possible implementation of the seventh aspect, the receiving unit is further used to receive a fourth message, and the fourth message is used to delete the first EPS bearer; the UE also includes: a deleting unit, used to delete the first EPS bearer and the first QoS flow information corresponding to the first EPS bearer.

[0098] In combination with any possible implementation manner of the seventh aspect to the twelfth possible implementation manner of the seventh aspect, in the thirteenth possible implementation manner of the seventh aspect, the first QoS flow information is included in a protocol configuration option PCO.

[0099] In combination with the first or second possible implementation manner of the seventh aspect, in a fourteenth possible implementation manner of the seventh aspect, the first information is included in a protocol configuration option PCO.

[0100] In combination with the third possible implementation manner of the seventh aspect, in a fifteenth possible implementation manner of the seventh aspect, the second information is included in a protocol configuration option PCO.

[0101] In combination with any possible implementation manner of the seventh aspect to the fifteenth possible implementation manner of the seventh aspect, in the sixteenth possible implementation manner of the seventh aspect, the storage unit is specifically used to: save the first QoS flow information in the context of the first EPS bearer; or save the index information of the first QoS flow information in the context information of the first EPS bearer, the index information including the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier.

[0102] In combination with any possible implementation of the seventh aspect to the sixteenth possible implementation of the seventh aspect, in the seventeenth possible implementation of the seventh aspect, the UE also includes: a deletion unit for deleting the context of the second EPS bearer, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the UE.

[0103] In combination with any possible implementation of the seventh aspect to the seventeenth possible implementation of the seventh aspect, in the eighteenth possible implementation of the seventh aspect, the receiving unit is further used to: receive a switching command, the switching command contains index information of one or more QoS flows, the index information includes a QoS flow identifier, or a combination of a QoS flow identifier and a PDU session identifier; accordingly, the mobile unit is specifically used to: move from the first communication system to the second communication system according to the switching command.

[0104] In combination with the eighteenth possible implementation method of the seventh aspect, in the nineteenth possible implementation method of the seventh aspect, the determination unit is specifically used to: associate the currently used EPS bearer with the index information of the QoS flow included in the switching command; and delete the EPS bearer in the currently used EPS bearer that cannot be associated with the index information of the QoS flow.

[0105] In combination with the nineteenth possible implementation manner of the seventh aspect, in the twentieth possible implementation manner of the seventh aspect, the determination unit is further specifically used to: obtain an EPS bearer context corresponding to the index information of the QoS flow; or, obtain an EPS bearer identifier corresponding to the index information of the QoS flow.

[0106] In combination with any one of the possible implementations of the seventh aspect to the twentieth possible implementation of the seventh aspect, in the twenty-first possible implementation of the seventh aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0107] In an eighth aspect, a core network entity is provided for moving a user equipment UE from a first communication system to a second communication system, the core network entity including: a determination unit for determining first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer of the UE in the first communication system; a sending unit for sending a first message, the first message being used to establish or modify a first EPS bearer for the UE within the first communication system, the first message including first QoS flow information; a saving unit for saving the first QoS flow information; the determination unit is also used to determine, when the UE moves from the first communication system to the second communication system, the QoS flow information used by the UE in the second communication system according to a fourth condition, the fourth condition including the first QoS flow information.

[0108] In combination with the eighth aspect, in a first possible implementation of the eighth aspect, the core network entity also includes: a receiving unit, used to receive the first information sent by the UE during the process of establishing the PDN connection within the first communication system; and a determination unit, further used to determine, based on the first information, that the PDN connection can be moved from the first communication system to the second communication system.

[0109] In combination with the first possible implementation manner of the eighth aspect, in the second possible implementation manner of the eighth aspect, the first information includes information for indicating that the PDN connection can be moved to the second communication system; or, the first information includes information for indicating that the service and session continuity (SSC) mode of the PDU session corresponding to the PDN connection in the second communication system is a specified mode.

[0110] In combination with the eighth aspect, in a third possible implementation of the eighth aspect, the core network entity also includes: a receiving unit, used to receive second information sent by the UE during the process of establishing a PDN connection within the first communication system, the second information being used to indicate the SSC mode of the PDN connection corresponding to the PDU session in the second communication system.

[0111] In combination with any possible implementation manner of the eighth aspect to the third possible implementation manner of the eighth aspect, in a fourth possible implementation manner of the eighth aspect, the first quality of service QoS flow information includes one or more QoS rules.

[0112] In combination with any possible implementation of the eighth aspect to the fourth possible implementation of the eighth aspect, in the fifth possible implementation of the eighth aspect, the first EPS bearer is the default bearer; the first quality of service QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, QoS rules.

[0113] In combination with the fourth or fifth possible implementation of the eighth aspect, in the sixth possible implementation of the eighth aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0114] In combination with the eighth aspect, in the seventh possible implementation method of the eighth aspect, the determination unit is also used to: obtain an identifier of the first QoS flow; wherein the identifier of the first QoS flow is obtained by adding a specific value to the identifier of the first EPS bearer; or, the identifier of the first QoS flow is obtained by adding a specific field to the identifier of the first EPS bearer.

[0115] In combination with any possible implementation manner of the eighth aspect to the seventh possible implementation manner of the eighth aspect, in the eighth possible implementation manner of the eighth aspect, the first message is used to establish a first EPS bearer for the UE within the first communication system, and the determination unit is specifically used to: map the context of the first EPS bearer to the first QoS flow information of the second communication system; or, the first message is used to modify the first EPS bearer for the UE within the first communication system, and the determination unit is specifically used to: map the context of the modified first EPS bearer to the first QoS flow information of the second communication system.

[0116] In combination with the eighth possible implementation method of the eighth aspect, in the ninth possible implementation method of the eighth aspect, the first message is used to establish a first EPS bearer for the UE within the first communication system, and the determination unit is also used to allocate a QoS flow identifier for the UE; or, the bearer identifier of the first EPS bearer is mapped to a QoS flow identifier.

[0117] In combination with the eighth possible implementation manner of the eighth aspect, in the tenth possible implementation manner of the eighth aspect, the first message is used to modify the first EPS bearer for the UE within the first communication system, and the determination unit is also used to determine that the first EPS bearer has the corresponding first QoS flow information of the second communication system.

[0118] In combination with the eighth aspect to the tenth possible implementation manner of the eighth aspect, in the eleventh possible implementation manner of the eighth aspect, the storage unit is specifically used to: save the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information; or, save the correspondence between the first EPS bearer context and the first QoS flow information; or, save the correspondence between the first EPS bearer context and the index information of the first QoS flow, the index information includes the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier; or, the UE saves the correspondence between the first EPS bearer and the first QoS flow; or, the UE saves the correspondence between the first EPS bearer and the index information of the first QoS flow, the index information includes the first QoS flow identifier, or a combination of the first QoS flow identifier and the PDU session identifier.

[0119] In combination with the eleventh possible implementation manner of the eighth aspect, in the twelfth possible implementation manner of the eighth aspect, the receiving unit is further used to receive second information sent by the second core network entity; wherein the second information includes a link bearer identifier and a bearer identifier that can be moved to the second communication system, or includes a PDN connection context, and the PDN connection uplink includes an EPS bearer context that can be moved to the second communication system; the second core network entity is a core network entity in the second communication system responsible for UE access and mobility management; the determination unit is further used to generate second QoS flow information of the second communication system according to the fifth condition, the second QoS flow information includes the QoS flow information corresponding to the EPS bearer of the UE in an activated state determined by the second core network entity; the fifth condition includes the second information, and the corresponding relationship.

[0120] In combination with the twelfth possible implementation manner of the eighth aspect, in the thirteenth possible implementation manner of the eighth aspect, the receiving unit is further used to receive the PDN connection context and first QoS flow status information sent by the second core network entity, the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state; the determination unit is further used to generate second QoS flow information of the second communication system according to the fifth condition, the second QoS flow information includes the QoS flow corresponding to the EPS bearer of the UE in the activated state determined by the second core network entity; the fifth condition includes the first QoS flow information, and the corresponding relationship.

[0121] In combination with any one of the eighth aspect to the thirteenth possible implementation manner of the eighth aspect, in the fourteenth possible implementation manner of the eighth aspect, the first QoS flow information is included in a protocol configuration option PCO.

[0122] In combination with the first or second possible implementation manner of the eighth aspect, in a fifteenth possible implementation manner of the eighth aspect, the first information is included in a protocol configuration option PCO.

[0123] In combination with the third possible implementation manner of the eighth aspect, in a sixteenth possible implementation manner of the eighth aspect, the second information is included in a protocol configuration option PCO.

[0124] In combination with any one of the eighth aspect to the sixteenth possible implementation manner of the eighth aspect, in the seventeenth possible implementation manner of the eighth aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0125] In a ninth aspect, a core network entity is provided for moving a user equipment UE from a first communication system to a second communication system, the core network entity comprising: an acquisition unit for acquiring first status information and a PDN connection context when the UE moves from the first communication system to the second communication system; a determination unit for determining second information according to a sixth condition, the second information being used by the first core network entity to determine the QoS flow information used by the UE in the second communication system, the sixth condition including the first status information and the PDN connection context; a sending unit for sending the second information; the acquisition unit is also used to receive third information sent by the first core network entity; the determination unit is also used to generate second status information according to a seventh condition, the seventh condition including the third information; the sending unit is also used to send a second message to the UE, the second message including second status information, the second status information being used by the UE to determine the QoS flow information used in the second communication system.

[0126] In combination with the ninth aspect, in a first possible implementation method of the ninth aspect, the first status information is the first EPS bearer status information, and the second status information is the second EPS bearer status information; wherein, the first EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state and has corresponding QoS flow information, and the second EPS bearer status information is used to identify the EPS bearer of the UE that is determined by the second core network entity to be in an activated state and has corresponding QoS flow information.

[0127] In combination with the ninth aspect, in a second possible implementation of the ninth aspect, the first status information is first QoS flow status information, and the second status information is second QoS flow status information; wherein, the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state, and the second QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state determined by the second core network entity.

[0128] In combination with the first possible implementation manner of the ninth aspect, in the third possible implementation manner of the ninth aspect, the third information includes the bearer identifier of the EPS bearer of the UE in an activated state determined by the first core network entity; or, the third information includes the second QoS flow status information determined by the first core network entity.

[0129] In combination with the first possible implementation method of the ninth aspect, in the fourth possible implementation method of the ninth aspect, the determination unit is specifically used to: determine the second information based on the intersection of the first EPS bearer status information and the EPS bearer existing in the PDN connection context; wherein the second information includes a link bearer identifier and a bearer identifier that can be moved to the second communication system, or includes a PDN connection context, and the PDN connection uplink contains an EPS bearer context that can be moved to the second communication system.

[0130] In combination with the second possible implementation method of the ninth aspect, in the fifth possible implementation method of the ninth aspect, the determination unit is specifically used to: map the PDN connection context to the QoS flow information of the second communication system, and determine the second information based on the intersection of the mapped QoS flow information and the QoS flow in the status information of the first QoS flow, where the second information includes the second QoS flow status information.

[0131] In combination with any possible implementation of the ninth aspect to the fifth possible implementation of the ninth aspect, in the sixth possible implementation of the ninth aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or, the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0132] In the tenth aspect, a user equipment UE is provided, which is used to move the UE from a first communication system to a second communication system, and the UE includes: an establishment unit, which is used to establish a first EPS bearer within the first communication system; a moving unit, which is used to move from the first communication system to the second communication system; a receiving unit, which is used to receive a first message, and the first message includes first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer; a determination unit, which is used to determine the QoS flow information used by the UE in the second communication system according to a first condition, and the first condition includes the first QoS flow information.

[0133] In combination with the tenth aspect, in a first possible implementation of the tenth aspect, the first quality of service QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, and QoS rules.

[0134] In combination with the first possible implementation of the tenth aspect, in the second possible implementation of the tenth aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0135] In combination with the tenth aspect, in a third possible implementation method of the tenth aspect, the determination unit is also used to obtain an identifier of the first QoS flow; the identifier of the first QoS flow is obtained by the UE adding a specific value to the identifier of the first EPS bearer, or the identifier of the first QoS flow is obtained by the UE adding a specific field to the identifier of the first EPS bearer.

[0136] In combination with any one of the third possible implementation methods of the tenth aspect to the tenth aspect, in the fourth possible implementation method of the tenth aspect, the UE also includes: a sending unit, used to send first EPS bearer status information to the second core network entity, the first EPS bearer status information is used to identify the EPS bearer of the UE in an activated state, and the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE.

[0137] In combination with any one of the third possible implementation methods of aspects ten to fourth, in the fifth possible implementation method of aspect ten, the UE also includes: a sending unit, used to send first QoS flow status information to the second core network entity, the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE, and the first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in an activated state.

[0138] In combination with the tenth aspect, in a sixth possible implementation of the tenth aspect, the first message is a registration acceptance message, and the N1 session management information parameter of the registration acceptance message includes the first QoS flow information; or, the first message is a PDU session modification message, and the N1 session management information parameter of the PDU session modification message includes the first QoS flow information.

[0139] In combination with the tenth aspect, in a seventh possible implementation manner of the tenth aspect, the first message is a switching command message, and the switching command message includes the first QoS flow information.

[0140] In combination with the seventh possible implementation manner of the tenth aspect, in an eighth possible implementation manner of the tenth aspect, the target-to-source transparent container of the switching command message includes the first QoS flow information.

[0141] In combination with the eighth possible implementation manner of the tenth aspect, in a ninth possible implementation manner of the tenth aspect, the access layer of the UE obtains the first QoS flow information from the target-to-source transparent container and sends it to the non-access layer of the UE.

[0142] In combination with any possible implementation manner of the tenth aspect to the ninth possible implementation manner of the tenth aspect, in the tenth possible implementation manner of the tenth aspect, the first message also includes information of the first EPS bearer corresponding to the first QoS flow information.

[0143] In combination with the tenth possible implementation manner of the tenth aspect, in an eleventh possible implementation manner of the tenth aspect, the information of the first EPS bearer includes a bearer identifier of the first EPS bearer.

[0144] In combination with the tenth or eleventh possible implementation of the tenth aspect, in the twelfth possible implementation of the tenth aspect, the UE also includes: a deletion unit, used to delete the context of the second EPS bearer, the second EPS bearer is an EPS bearer of the UE that is not included in the first message; or, the second EPS bearer is an EPS bearer of the UE that does not correspond to QoS flow information.

[0145] In combination with any one of the tenth possible implementation methods of the tenth aspect to the twelfth possible implementation method of the tenth aspect, in the thirteenth possible implementation method of the tenth aspect, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or, the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0146] In the eleventh aspect, a core network entity is provided for moving a UE from a first communication system to a second communication system, the core network entity comprising: a receiving unit for receiving first information sent by a second core network entity when the UE moves from the first communication system to the second communication system, the first information including a PDN connection context, and the PDN connection uplink including an EPS bearer context that can be moved to the second communication system; the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE; a determining unit for determining the QoS flow information used by the UE in the second communication system according to a first condition, the first condition including the PDN connection context.

[0147] Alternatively, the core network entity includes: a receiving unit, configured to receive second information sent by the second core network entity when the UE moves from the first communication system to the second communication system, the second information including a PDN connection that can be moved to the second communication system and QoS flow status information corresponding to the PDN; the second core network entity is a core network entity in the second communication system responsible for access and mobility management of the UE; a determining unit, configured to determine the QoS flow information used by the UE in the second communication system based on a first condition, the first condition including the PDN connection and the QoS flow status information. Furthermore, the PDN connection includes all PDN connections of the UE in the first communication system, and the core network entity further includes: a deleting unit, configured to delete QoS flows that are not in the QoS flow status information in the QoS flows corresponding to the EPS bearer of the PDN connection.

[0148] In combination with the eleventh aspect, in a first possible implementation of the eleventh aspect, the QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, and QoS rules.

[0149] In combination with the first possible implementation of the eleventh aspect, in the second possible implementation of the eleventh aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0150] In combination with any one of the second possible implementation methods of aspect eleven to aspect eleven, in the third possible implementation method of aspect eleven, the first communication system is a fourth-generation communication system, the second communication system is a fifth-generation communication system; and / or, the first core network entity is a session management function entity + control plane PDN gateway (SMF+PGW-C).

[0151] In the twelfth aspect, a core network entity is provided for moving a user equipment UE from a first communication system to a second communication system, the core network entity including: an acquisition unit, for receiving, when the UE moves from the first communication system to the second communication system, first quality of service QoS flow information of the second communication system corresponding to the first EPS bearer established by the UE in the first communication system; a sending unit, for sending a first message to the UE, the first message including the first QoS flow information.

[0152] In combination with the twelfth aspect, in a first possible implementation of the twelfth aspect, the first QoS flow information includes one or more of the following information: session aggregation maximum bit rate, SSC mode, PDU session identifier, and QoS rules.

[0153] In combination with the first possible implementation of the twelfth aspect, in the second possible implementation of the twelfth aspect, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier.

[0154] In combination with any one of the second possible implementation methods of aspect 12 to aspect 12, in the third possible implementation method of aspect 12, the acquisition unit is also used to obtain first EPS bearer status information and PDN connection context, and the first EPS bearer status information is used to identify the EPS bearer of the UE in an activated state; the core network entity also includes: a determination unit, used to determine third information based on the first EPS bearer status information and the PDN connection context, the third information including a PDN connection that can be moved to a second communication system and an EPS bearer within the PDN connection, or a PDN connection context that can be moved to a second communication system.

[0155] In combination with any one of the second possible implementation methods of aspect 12 to aspect 12, in the fourth possible implementation method of aspect 12, the acquisition unit is further used to obtain first QoS flow status information and PDN connection context, and the first QoS flow status information is used to identify the QoS flow corresponding to the activated EPS bearer of the UE; the sending unit is further used to send the first QoS flow status information and PDN connection context to the first core network entity; the acquisition unit is also used to receive second QoS flow information sent by the first core network entity, and the second QoS flow information is used to identify the QoS flow corresponding to the activated EPS bearer of the UE determined by the first core entity.

[0156] In combination with the twelfth aspect, in the fifth possible implementation of the twelfth aspect, the first message is a registration acceptance message, and the N1 session management information parameter of the registration acceptance message includes the first QoS flow information; or, the first message is a PDU session modification message, and the N1 session management information parameter of the PDU session modification message includes the first QoS flow information.

[0157] In combination with the twelfth aspect, in a sixth possible implementation manner of the twelfth aspect, the first message is a switching command message, and the switching command message includes the first QoS flow information.

[0158] In combination with the sixth possible implementation manner of the twelfth aspect, in a seventh possible implementation manner of the twelfth aspect, the target-to-source transparent container of the switching command message includes the first QoS flow information.

[0159] In combination with any possible implementation manner of the twelfth aspect to the seventh possible implementation manner of the twelfth aspect, in an eighth possible implementation manner of the twelfth aspect, the first message also includes information of the first EPS bearer corresponding to the first QoS flow information.

[0160] In combination with the eighth possible implementation manner of the twelfth aspect, in a ninth possible implementation manner of the twelfth aspect, the information of the first EPS bearer includes a bearer identifier of the first EPS bearer.

[0161] In combination with any one of the ninth possible implementations of the twelfth aspect to the twelfth aspect, in the tenth possible implementation of the twelfth aspect, the first communication system is a fourth-generation communication system, and the second communication system is a fifth-generation communication system.

[0162] In the thirteenth aspect, a user equipment UE is provided, which includes a memory, a processor, a communication interface and a bus, wherein the memory stores code and data, the processor, the memory and the communication interface are connected through the bus, and the processor runs the code in the memory so that the user equipment executes the inter-communication system mobility method provided by the above-mentioned first aspect or any possible implementation of the first aspect, or executes the inter-communication system mobility method provided by the above-mentioned fourth aspect or any possible implementation of the fourth aspect.

[0163] In the fourteenth aspect, a core network device is provided, which includes a memory, a processor, a communication interface and a bus, wherein the memory stores code and data, and the processor, the memory and the communication interface are connected through the bus. The processor runs the code in the memory so that the core network device executes the inter-communication system mobility method provided by the above-mentioned second aspect or any possible implementation of the second aspect, or the inter-communication system mobility method provided by the above-mentioned fifth aspect or any possible implementation of the fifth aspect.

[0164] In the fifteenth aspect, a core network device is provided, which includes a memory, a processor, a communication interface and a bus, wherein the memory stores code and data, and the processor, the memory and the communication interface are connected through the bus. The processor runs the code in the memory so that the core network device executes the inter-communication system mobility method provided by the third aspect or any possible implementation of the third aspect, or the inter-communication system mobility method provided by the sixth aspect or any possible implementation of the sixth aspect.

[0165] In the sixteenth aspect, a system is provided, which includes a user equipment UE, a first core network entity, and a second core network entity; wherein, the user equipment is the user equipment provided by the seventh aspect or any possible implementation of the seventh aspect, or the tenth aspect or any possible implementation of the tenth aspect, or the thirteenth aspect; and / or, the first core network entity is the core network device provided by the eighth aspect or any possible implementation of the eighth aspect, or the eleventh aspect or any possible implementation of the eleventh aspect, or the fourteenth aspect; and / or, the second core network entity is the core network device provided by the ninth aspect or any possible implementation of the ninth aspect, or the twelfth aspect or any possible implementation of the twelfth aspect, or the fifteenth aspect.

[0166] Another aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores instructions, which, when executed on a computer, enable the computer to execute the methods described in the above aspects.

[0167] Yet another aspect of the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the methods described in the above aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0168] Figure 1 A system architecture diagram of a communication system provided in an embodiment of the present application;

[0169] Figure 2 A schematic diagram of the structure of a user equipment provided in an embodiment of the present application;

[0170] Figure 3 A flowchart of a first inter-communication system mobility method provided in an embodiment of the present application;

[0171] Figure 4 A flowchart of a second inter-communication system mobility method provided in an embodiment of the present application;

[0172] Figure 4A A flowchart of a third inter-communication system mobility method provided in an embodiment of the present application;

[0173] Figure 5 A flowchart of a UE moving to a second communication system provided in an embodiment of the present application;

[0174] Figure 6 A flowchart of another UE moving to a second communication system provided in an embodiment of the present application;

[0175] Figure 7 A flowchart of another embodiment of the present application providing a UE moving to a second communication system;

[0176] Figure 8 A flowchart of a fourth inter-communication system mobility method provided in an embodiment of the present application;

[0177] Figure 9 A flowchart of a fifth inter-communication system mobility method provided in an embodiment of the present application;

[0178] Figure 10 A flowchart of a UE moving to a second communication system provided in an embodiment of the present application;

[0179] Figure 11 A flowchart of another UE moving to a second communication system provided in an embodiment of the present application;

[0180] Figure 12 A flowchart of another embodiment of the present application providing a UE moving to a second communication system;

[0181] Figure 13 A flowchart of a sixth inter-communication system mobility method provided in an embodiment of the present application;

[0182] Figure 14 A schematic diagram of the structure of a user equipment provided in an embodiment of the present application;

[0183] Figure 15 A schematic diagram of the structure of another user equipment provided in an embodiment of the present application;

[0184] Figure 16 A schematic diagram of the structure of a first core network device provided in an embodiment of the present application;

[0185] Figure 17 A schematic diagram of the structure of another first core network device provided in an embodiment of the present application;

[0186] Figure 18 A schematic diagram of the structure of a second core network device provided in an embodiment of the present application;

[0187] Figure 19 A schematic diagram of the structure of another second core network device provided in an embodiment of the present application;

[0188] Figure 20 A schematic diagram of the structure of a user equipment provided in an embodiment of the present application;

[0189] Figure 21 A schematic diagram of the structure of another user equipment provided in an embodiment of the present application;

[0190] Figure 22 A schematic diagram of the structure of a first core network device provided in an embodiment of the present application;

[0191] Figure 23 A schematic diagram of the structure of another first core network device provided in an embodiment of the present application;

[0192] Figure 24 A schematic diagram of the structure of a second core network device provided in an embodiment of the present application;

[0193] Figure 25 A structural diagram of another second core network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0194] Before introducing the present application, the technical terms involved in the embodiments of the present application are first introduced and explained.

[0195] Protocol Data Network (PDN) Connection (or Connectivity): A set of EPS bearers established on a UE within a primary communication system (e.g., a 4G network). These EPS bearers have the same IP address and Access Point Name (APN). A PDN connection is identified on the UE and network side by its IP address and APN.

[0196] PDN connection context: includes the IP address, APN, PGW address used by the PDN connection, and context information of each EPS bearer.

[0197] An EPS bearer is a data transmission channel within a first communication system (e.g., a 4G network). An active EPS bearer is an established data transmission channel with a specified QoS within the first communication system. An inactive EPS bearer is a deleted data transmission channel within the first communication system.

[0198] EPS bearer status information: In a first communication system (e.g., a 4G network), each EPS bearer has an EPS bearer identifier (EBI). EPS bearer status information is used to identify whether the bearer corresponding to each EBI exists. For example, the EBIs shown in Table 1 range from 0 to 15, and their corresponding values ​​are as shown in Table 1. In Table 1, the corresponding values ​​for EBIs 5 and 7 are 1, indicating that the corresponding EPS bearer exists. Other EBI values ​​are 0, indicating that no corresponding bearer exists.

[0199] Table 1

[0200] EBI 7 6 5 4 3 2 1 0 Value 1 0 1 0 0 0 0 0 EBI 15 14 13 12 11 10 9 8 Value 0 0 0 0 0 0 0 0

[0201] EPS bearer context: includes the EPS bearer QoS information, EPS bearer identifier, TFT and other information.

[0202] PDU Session: A group of QoS flows established on a UE within a 5G network. These QoS flows have the same IP address and Data Network Name (DNN). On the UE and network side, a PDU session is identified by the IP address and DNN.

[0203] PDU session context: includes the IP address, APN, SMF and UPF addresses used by the PDU session, as well as the context information of each QoS flow.

[0204] Service and Session Continuity (SSC) mode of PDU session: Each PDU session of the second communication system (for example, 5G) has a continuity description. SSC mode 1 means that the PDU session can always maintain continuity during the movement of the UE; SSC mode 2 means that during the movement of the UE, the existing PDU session can be released first and a new PDU session can be established to replace the released PDU session; SSC mode 3 means that during the movement of the UE, the existing PDU session can be maintained for a period of time, and a new PDU session can be established to replace the original PDU session. After the existing PDU session time expires, the existing PDU session is released and only the new PDU session is retained.

[0205] QoS flow information includes: QoS information of the QoS flow, QoS flow identity (QFI), and a combination of one or more information of the QoS flow template. For example, in a 5G communication system, the QoS information may further include a 5G QoS indicator (5G QoS Indicator, 5QI) corresponding to the QoS, allocation and retention priority (ARP), guaranteed flow bit rate (GFBR), maximum flow bit rate (MFBR), and a combination of one or more information of notification control. QoS flow information is used to describe the QoS flow, including but not limited to the information described above. Among them, QoS flow information can also be called QoS parameters, and the QoS flow information in the embodiment of the present application can be replaced by QoS parameters.

[0206] Protocol Configuration Option (PCO): Parameters used for information transmission between the UE and the PDN Gateway (PGW). The Mobility Management Entity (MME) and the base station do not parse the PCO.

[0207] The difference between extended PCO and PCO: Since the size of PCO is limited, in order to carry more data, PCO is extended, that is, extended PCO.

[0208] The system architecture of the communication system used in the embodiments of the present application is as follows: Figure 1 As shown, the system architecture includes a first communication system and a second communication system. Figure 1 In the description, the first communication system is a fourth generation (4G) communication system and the second communication system is a fifth generation (5G) communication system.

[0209] See also Figure 1The communication system includes UE, evolved UMTS terrestrial radio access network (Evolved UMTS Terrestrial Radio Access Network, E-UERAN), mobility management entity MME, serving gateway (Serving Gateway, SGW), user plane function (User Plane Function, UPF) + PDN gateway user plane (PDN Gateway-User plane, PGW-U), session management function (Session Management Function, SMF) + PDN gateway control plane (PDN Gateway-Control plane, PGW-C), policy control function (Policy Control Function, PCF) + Policy and Charging Rules Function Unit (Policy and Charging Rules Function, PCRF), home subscription server (Home Subscriber Server, HSS) + unified data management (Unified Data Management, UDM), access and mobility management function (Access and Mobility Management Function, AMF) and 5G Radio Access Network (5G-RAN).

[0210] Among them, E-UTRAN is a 4G side base station, through which the UE can access the 4G communication system; 5G-RAN is a 5G side base station, through which the UE can access the 5G communication system. 5G-RAN can be a base station that is further evolved from E-UTRAN, through which the UE can access the 5G communication system, or 5G-RAN can be a base station specifically used for UE to access the 5G communication system. Figure 1 The core network entity in can be called core network equipment.

[0211] The MME is a 4G core network device responsible for UE authentication, authorization, mobility management, and session management. The Linked EPS Bearer ID (LBI) of the UE's 4G PDN connection is allocated by this entity.

[0212] SGW is a 4G core network device (core network gateway) responsible for data forwarding and downlink data storage.

[0213] UPF+PGW-U is a core network device shared by 4G and 5G, that is, a core network device jointly set up by 4G and 5G, including the functions of UPF and PGW-U. Among them, UPF is the user plane device of the 5G core network, providing user plane services for the UE's PDU sessions; it is the interface gateway between the operator network and the external network. PGW-U is a user plane device of the 4G core network, providing user plane services for the UE's PDN connection; it is the interface gateway between the operator network and the external network. UPF+PGW-U can also be called PGW-U+UPF. Any device that includes UPF and PGW-U functions is the same as this device.

[0214] SMF+PGW-C is a core network device shared by 4G and 5G, that is, a core network device jointly set up by 4G and 5G, including the functions of SMF and PGW-C. Among them, SMF is the control plane device of the 5G core network, providing control plane services for the UE's PDU sessions; managing the 5G PDU sessions, managing the 5G QoS, and being responsible for allocating IP addresses to the UE and selecting UPF for the UE. PGW-C is a control plane device of the 4G core network, providing user plane services for the UE's PDN connection; being responsible for allocating IP addresses to the UE and establishing EPS bearers for the UE. SMF+PGW-C can also be called PGW-C+SMF. Any device that contains SMF and PGW-C functions is the same as this device.

[0215] PCF+PCRF is a core network device shared by 4G and 5G, that is, a core network device jointly established by 4G and 5G, including PCF and PCRF. Among them, PCRF is a 4G core network device responsible for generating policies for users to establish data bearers. PCF is a 5G core network device with similar functions to PCRF. PCF+PCRF can also be referred to as PCRF+PCF. Any device that includes PCF and PCRF functions is the same as this device.

[0216] UDM+HSS is a core network device shared by 4G and 5G. It includes the HSS and UDM. The HSS is a 4G core network device used to store user subscription data. The SDM is a 5G core network device used to store user subscription data. UDM+HSS can also be referred to as HSS+UDM. Any device that includes both HSS and UDM functions is equivalent to this device.

[0217] AMF is a 5G core network device used to authenticate and authorize users and manage their mobility.

[0218] The Nx interface is the interface between the MME and AMF and is currently optional. When a UE moves between 4G and 5G, the Nx interface enables UE context transfer. To ensure seamless transfer of a PDN connection established by the UE within the 4G network to the 5G network, the MME selects the SMF + PGW-C (a combined 5G and 4G network element) for the UE. Seamless transfer means that the IP address and PGW-C remain unchanged.

[0219] Figure 2 This is a schematic diagram of the structure of a UE provided in an embodiment of the present application. The UE may be a mobile phone, tablet computer, laptop computer, netbook, or portable electronic device. Figure 2 As shown, the UE may include components such as memory, a processor, radio frequency (RF) circuitry, and a power supply. The memory can be used to store software programs and modules, and the processor executes the software programs and modules stored in the memory to perform various UE functions and data processing. The memory may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function, while the data storage area may store data generated based on the UE's usage. Furthermore, the memory may include high-speed random access memory and non-volatile memory. The processor is the control center of the UE, connecting various components of the UE using various interfaces and circuits. By running or executing software programs and / or modules stored in the memory and accessing data stored in the memory, it executes various UE functions and processes data, thereby providing overall monitoring of the UE. Optionally, the processor may include one or more processing units. Preferably, the processor may integrate an application processor and a modem processor. The application processor primarily processes the operating system, user interface, and application programs, while the modem processor primarily handles wireless communications. The RF circuitry can be used to transmit and receive information or receive signals during calls. Typically, the RF circuit includes, but is not limited to, an antenna, at least one amplifier, a transceiver, a coupler, an LNA (low noise amplifier), a duplexer, and the like. The UE also includes a power supply for supplying power to various components. Preferably, the power supply can be logically connected to the processor via a power management system, thereby enabling the power management system to manage charging, discharging, and power consumption.

[0220] Although not shown, the UE may further include an input unit, a display unit, a sensor module, an audio module, a WiFi module, a Bluetooth module, etc., which will not be described in detail here.

[0221] Figure 3 This is a flow chart of a method for moving between communication systems provided in an embodiment of the present application, see Figure 3 , this method is applied to the above Figure 1 The communication system shown is used to move a UE from a first communication system to a second communication system. The method may include the following steps.

[0222] Step 201: A first core network entity determines first QoS flow information of a second communication system corresponding to a first EPS bearer of the UE in the first communication system, and saves the first QoS flow information.

[0223] The PDN connection in the first communication system corresponds to the PDU session in the second communication system, a PDN connection may include multiple EPS bearers, a PDU session may include multiple QoS flows, and the UE may establish multiple PDN connections in the first communication system, among which one or more PDN connections may be movable to the second communication system. A PDN connection movable to the second communication system means that the PGW used by the PDN connection is a SMF+PGW-C jointly established by 4G and 5G; or, when the UE moves from the first communication system to the second communication system, a PDU session corresponding to the PDN connection may be established in the second communication system, and the PDN connection and the PDU session have the same IP address; or, the PGW used by the PDN connection is a SMF+PGW-C jointly established by 4G and 5G, and when the UE moves from the first communication system to the second communication system, a PDU session corresponding to the PDN connection may be established in the second communication system, and the PDN connection and the PDU session have the same IP address.

[0224] The first EPS bearer refers to the EPS bearer included in the PDN connection established by the UE in the first communication system, which can be one EPS bearer or a group of EPS bearers. The first QoS flow corresponds to the first EPS bearer, and the first QoS flow can include one QoS flow or a group of QoS flows. One EPS bearer can correspond to one or more QoS flows. The first QoS flow information refers to the information obtained after mapping the first EPS bearer to the QoS flow in the second communication system, for example, mapping according to a predefined mapping rule, or generating the first QoS flow information based on the first EPS bearer. Not all EPS bearers on the UE can be moved to the second communication system, for example, non-GBR EPS bearers cannot be moved to the second communication system; or when the PDN connection cannot be moved to the second communication system, all EPS bearers of the PDN connection cannot be moved to the second communication system. There is no corresponding QoS flow information for EPS bearers that cannot be moved to the second communication system.

[0225] In an embodiment of the present application, the first QoS flow information may include one or more QoS rules. When the first EPS bearer is the default bearer, the first QoS flow information includes one or more of the following information: session aggregation maximum bit rate (session AMBR), SSC mode, PDU session identifier, and QoS rule. The QoS rule may be one QoS rule or multiple QoS rules. Specifically, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority (precedence), and packet filter; or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, and packet filter identifier. Among them, the packet filter includes a packet filter attribute and a packet filter identifier (packet filter ID). Furthermore, the first QoS flow information may also include a combination of one or more information of 5QI, ARP, GFBR, MFBR, and notification control corresponding to the QoS flow. It can be understood that the default bearer of the UE is established during the process of the UE establishing a PDN connection in the first communication system. That is, establishing a default bearer for the UE can be understood as establishing a PDN connection for the UE. The UE may specifically request to establish a PDN connection through an attach request or a PDN Connectivity Request request. During the process of establishing a PDN connection for the UE by the first communication system, information about the PDU session of the second communication system corresponding to the PDN connection is sent to the UE through a request message for establishing a default bearer. The PDU session information includes one or more of a session aggregation maximum bit rate (session AMBR), an SSC mode, and a PDU session identifier.

[0226] Exemplarily, the method for SMF+PGW-C to determine the first QoS flow information of the 5G communication system may be: SMF+PGW-C generates a 5G QoS rule based on the service flow template (TFT) of the EPS context. Specifically comprising: generating a QoS rule based on one or more policy and charging control (PCC) rules for generating EPS bearer TFT. The priority of each PCC is set to the priority of the QoS rule, and the one or more packet filters of the PCC are set to the packet filter of the QoS rule. In addition, SMF+PGW-C may also assign a QoS rule identifier to the QoS rule. Exemplarily, SMF+PGW-C may also set the QCI of the EPS bearer to the 5QI of 5G, the GBR of the EPS bearer to the GFBR of 5G, the MBR of the EPS bearer to the MFBR of 5G, and the EBI of the default bearer of the PDN connection to the PDU session identifier of 5G.

[0227] Furthermore, the method may further include: the UE obtaining a first QoS flow identifier (QFI), wherein the first QoS flow identifier is obtained by the UE adding a specific value to the first EPS bearer identifier (EBI); or, the first QoS flow identifier is obtained by the UE adding a specific field to the first EPS bearer identifier.

[0228] For example, QFI is obtained by increasing EBI by a specific value. For example, if the specific value is 10, if EBI is 5, QFI is 15; if EBI is 6, QFI is 16. For another example, QFI is obtained by adding a specific field to EBI. For example, if the specific field is one byte, QFI is obtained by adding one byte to EBI. For example, if one byte of EBI is 00000101, the two bytes after adding one byte to QFI are 0000010100000001.

[0229] It should be noted that the specific value and the specific numerical value of the specific field can be set as needed, and the embodiment of the present invention does not specifically limit this.

[0230] In addition, the first core network entity storing the first QoS flow information may include: the first core network entity storing a correspondence between a bearer identifier (EPS Bearer Identity, EBI) of the first EPS bearer and the first QoS flow information; or the first core network entity storing a correspondence between the first EPS bearer context and the first QoS flow information; or the first core network entity storing a correspondence between the identifier of the first QoS flow and the first EPS bearer context; or the first core network entity storing a correspondence between the identifier of the first QoS flow and the session identifier and the first EPS bearer context, where the session identifier is the identifier of the PDU session to which the first QoS flow belongs; or storing a correspondence between the first EPS bearer and the first QoS flow; or storing a correspondence between the first EPS bearer and the first QoS flow and index information of the first QoS flow, where the index information includes the first QoS flow identifier or a combination of the first QoS flow identifier and the PDU session identifier. The first core network entity may store the first QoS flow information in the bearer context of the first EPS bearer of the UE; or the first core network entity generates a QoS flow context of the second communication system for the UE, where the QoS flow context includes the EBI or the first EPS bearer information.

[0231] In an embodiment of the present application, the first communication system may be a 4G communication system, the second communication system may be a 5G communication system, and the first core network entity may be a network element SMF+PGW-C established by integrating the two communication systems, so that the SMF+PGW-C can determine the first QoS flow information in the 5G communication system based on the EPS bearer context of the UE in the 4G communication system. The QoS flow information may also be referred to as a 5G QoS rule (Rule) or a 5G QoS parameter. The first QoS flow information includes the QoS information of the QoS flow, the QoS flow identifier QFI, the QoS rule, the PDU session information to which the QoS flow belongs, and a combination of one or more information of the QoS flow template. The QoS information further includes a combination of one or more information of the 5QI, ARP, GFBR, MFBR, and notification control corresponding to the QoS.

[0232] For example, SMF+PGW-C can generate QoS in the 5G QoS flow based on the QoS of the EPS bearer in the first EPS bearer, and generate a template or QoS rule for the 5G QoS flow based on the TFT of the EPS bearer.

[0233] Step 202: The first core network entity sends a first message, where the first message is used to establish or modify a first EPS bearer for the UE in the first communication system, and the first message includes first QoS flow information.

[0234] When the first core network entity establishes a first EPS bearer for the UE in the first communication system or modifies the first EPS bearer, the first core network entity can send a first message containing first QoS flow information to the UE so that the UE obtains the first QoS flow information corresponding to the first EPS bearer.

[0235] If the first message is used to establish a first EPS bearer for the UE within the first communication system, step 201 specifically includes: the first core network entity mapping the context of the first EPS bearer to first QoS flow information of the second communication system. If the first message is used to modify the first EPS bearer for the UE within the first communication system, step 201 specifically includes: the first core network entity mapping the context of the modified first EPS bearer to first QoS flow information of the second communication system. The mapping mentioned herein can be understood as generating first QoS flow information based on the context of the first EPS bearer, or mapping according to predefined mapping rules. The first QoS flow information can be the complete first QoS flow information mapped by the first core network entity, or the first QoS flow information can be partial information of the first QoS flow information mapped by the first core network entity, which is the first QoS flow information that the UE cannot obtain through local mapping. For example, the partial information includes partial QoS rule information and partial PDU session information. The partial QoS rule information includes one or more of a QoS rule ID, a precedence, and a packet filter identifier; the partial PDU session information includes one or more of a session AMBR, an SSC mode, and a PDU session identifier. The benefit of sending partial information is to reduce the amount of air interface data transmission and save resources.

[0236] Specifically, in the above Figure 1 In the communication system shown, the first core network entity SMF+PGW-C can send the first QoS flow information to the SGW via a first message, and the SGW forwards the first QoS flow information to the MME, which then sends the first QoS flow information to the UE; or the first core network entity SMF+PGW-C can send the first QoS flow information to the SGW, and the SGW forwards the first QoS flow information to the MME, which then sends the first QoS flow information to the UE via a first message. The first message can include a protocol configuration option PCO, and the first QoS flow information can be included in the PCO. The PCO can be a common PCO or an extended PCO.

[0237] Furthermore, if the first message is used to establish a first EPS bearer for the UE in the first communication system, the method further includes: the first core network entity may also assign a QoS flow identifier to the UE, that is, assign a corresponding QoS flow identifier to the QoS flow included in the first QoS flow information determined in step 201; or, mapping the bearer identifier of the first EPS bearer to the QoS flow identifier. If the first message is used to modify a first EPS bearer for the UE in the first communication system, the method further includes: the first core network entity determining whether the first EPS bearer has corresponding first QoS flow information of the second communication system, that is, the first core network entity determines whether the first EPS bearer of the UE in the first communication system has corresponding first QoS flow information of the second communication system; if so, determining the first QoS flow information according to step 201. The existence of the first QoS flow information of the second communication system corresponding to the first EPS bearer can be understood as including the first QoS flow information in the context information of the first EPS bearer; or, the UE separately stores the context of the first EPS bearer and the first QoS flow information, and the context information of the first EPS bearer includes index information of the first QoS flow, which can be a QoS flow ID or a combination of the QoS flow ID and the PDU session ID. In the embodiment of the present application, the meaning of QoS flow information and QoS flow information is the same, and the other parts of this document are understood in the same way and will not be repeated here.

[0238] Step 203: When the UE receives the first message sent by the first core network entity, the UE may save the first QoS flow information.

[0239] When the UE receives the first message containing the first QoS flow information sent by the first core network entity, the UE may save the first QoS flow information. When the UE saves the first QoS flow information, the UE may save the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information; or, the UE saves the correspondence between the first EPS bearer context and the first QoS flow information; or, the UE saves the correspondence between the first EPS bearer context and the index information of the first QoS flow, where the index information may be a QoS flow ID or a combination of the QoS flow ID and the PDU session ID; or, the UE includes the information of the first QoS flow in the context of the first EPS bearer; or, the UE saves the context of the first EPS bearer and the first QoS flow information separately, and includes the index information of the first QoS flow in the context information of the first EPS bearer, where the index information may be a QoS flow ID or a combination of the QoS flow ID and the PDU session ID; or, saves the correspondence between the first EPS bearer and the first QoS flow; or, saves the correspondence between the first EPS bearer and the index information of the first QoS flow, where the index information includes the first QoS flow identifier or a combination of the first QoS flow identifier and the PDU session identifier. Furthermore, the UE may save the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information, which may be specifically understood as saving the correspondence between the bearer identifier of the first EPS bearer and the information of the first QoS flow in the context of the first EPS bearer. The UE saves the correspondence between the first EPS bearer and the first QoS flow information, which may be specifically understood as saving the information of the first QoS flow in the context of the first EPS bearer, or including the index information of the first QoS flow in the context information of the first EPS bearer, which may be a QoS flow ID, or a combination of a QoS flow ID and a PDU session ID. The PDU session ID here is the ID of the PDU session to which the QoS flow belongs, that is, the PDU session indicated by the PDU session ID includes the first QoS flow.

[0240] Step 204: The UE moves from the first communication system to the second communication system.

[0241] Optionally, the UE moves from the first communication system to the second communication system through a handover process. During the handover process, the UE receives a handover command, which includes index information of one or more QoS flows, and the index information includes a QoS flow identifier, or a combination of a QoS flow identifier and a PDU session identifier. The handover command is sent to the UE by the base station of the first communication system, and the handover command includes configuration information allocated to the UE by the base station of the second communication system, and the configuration information is used for the UE to access the base station of the second communication system. The configuration information includes a QoS flow identifier, or a combination of a QoS flow identifier and a PDU session ID.

[0242] Step 205: The UE determines the QoS flow information used by the UE in the second communication system according to the first condition, where the first condition includes the first QoS flow information.

[0243] Among them, the first QoS flow information in step 205 is consistent with the first QoS flow information in the above step 201. The method for the UE to determine the first QoS flow information is similar. Please refer to the description in the above step 201 for details. The embodiment of this application will not be repeated here.

[0244] Optionally, after the UE receives the handover command, the method by which the UE determines the QoS flow information used in the second communication system may be: the UE associates the currently used EPS bearer with the index information of the QoS flow contained in the handover command, and the UE deletes the EPS bearer in the currently used EPS bearer that cannot be associated with the index information of the QoS flow. The currently used EPS bearer can be understood as an EPS bearer that currently exists (ongoing) on ​​the UE, or an EPS bearer that is currently activated on the UE.

[0245] Specifically, the UE associates the currently used EPS bearer with the index information of the QoS flow included in the handover command, including: the UE obtains the EPS bearer context corresponding to the index information of the QoS flow; or the UE obtains the EPS bearer identifier corresponding to the index information of the QoS flow. Specifically, the UE obtains the index information of the QoS flow in the handover command, and the UE locally searches for the EPS bearer context or EPS bearer identifier corresponding to the index information. The UE locally deletes other EPS bearers on the UE except for the EPS bearer that can be found.

[0246] Step 206: When the UE moves from the first communication system to the second communication system, or after the UE moves from the first communication system to the second communication system, the first core network entity determines the QoS flow information used by the UE in the second communication system according to the fourth condition, and the fourth condition includes the first QoS flow information.

[0247] Among them, the QoS flow information used by the UE in the second communication system can be the QoS flow information corresponding to one or more PDU sessions of the UE, or it can be the information of one or more PDU sessions of the UE, and when it includes multiple, the corresponding information can be called a set of information. That is, the QoS flow information can be understood as a set of one or more QoS flow information, or as a set of one or more PDU session information. It can be understood that if there is only one QoS flow information or only one PDU session information in the QoS flow information, then there is only one QoS flow information or one PDU session information in the set. The other parts of this article have the same understanding and will not be repeated here.

[0248] Specifically, the UE and the first core network entity can determine the QoS flow information that the UE can use in the second communication system based on the first QoS flow information included in the first condition, thereby realizing the mapping of the EPS bearer of the UE in the first communication system and the QoS flow in the second communication system, so that the UE can be seamlessly transferred from the first communication system to the second communication system, and can use the QoS flow information to communicate or transmit data with the second communication system.

[0249] It should be noted that the above steps 204, 205 and 206 may be performed in any order. For the UE, the UE may first move from the first communication system to the second communication system, and then determine the QoS flow information used in the second communication system; or, the UE may first determine the QoS flow information used in the second communication system, and then move from the first communication system to the second communication system; or, the UE may determine the QoS flow information used in the second communication system during the process of moving from the first communication system to the second communication system. The embodiments of the present application do not specifically limit this. Figure 3 In the description, the example in which step 204 is located before step 205 and step 206 is used.

[0250] For further information, see Figure 4 Before step 201, the method further includes: steps 200a-200b.

[0251] Step 200a: During the process of establishing a PDN connection in the first communication system, the UE sends first information to the first core network entity. The first information is used by the first core network entity to determine that the PDN connection can be moved from the first communication system to the second communication system.

[0252] The PDN connection establishment may be established during an attach process, or may be established according to a PDN connection establishment request requested by the UE.

[0253] In addition, the first information includes information for indicating that the PDN connection can be moved to the second communication system, that is, the first information includes information directly used to indicate that the PDN can be moved to the second communication system. Alternatively, the first information includes information for indicating that the service and session continuity SSC mode of the PDU session corresponding to the PDN connection in the second communication system is a specified mode, and the specified mode can be set in advance, that is, the first information includes information indirectly used to indicate that the PDN can be moved to the second communication system. For example, the specified mode can be mode 1 in the SSC mode, that is, when the first information contains information for indicating that the SSC mode of the PDU session corresponding to the PDN connection in the second communication system is mode 1, it means that the PDN connection can be moved to the second communication system.

[0254] Specifically, during the process of establishing the PDN connection in the first communication system, the UE may send the first information to the first core network entity through the PCO, that is, the first information is included in the PCO, and the PCO may be a common PCO or an extended PCO.

[0255] Step 200b: When the first core network entity receives the first information sent by the UE, the first core network entity determines, based on the first information, that the PDN connection can be moved from the first communication system to the second communication system.

[0256] Specifically, if the first information includes information for indicating that the PDN connection can be moved to the second communication system, when the first core network entity receives the first information sent by the UE, the first core network entity can directly determine that the PDN connection can be moved from the first communication system to the second communication system. If the first information includes information for indicating that the SSC mode of the PDU session corresponding to the PDN connection in the second communication system is a specified mode, when the first core network entity receives the first information sent by the UE, the first core network information determines whether the SSC mode indicated in the first information is the specified mode. If it is the specified mode, it is determined that the PDN connection can be moved from the first communication system to the second communication system.

[0257] For further information, see Figure 4A In the process of establishing a PDN connection in the first communication system, specifically before the first core network entity sends the first message in step 202, the method further includes: steps 201a-201b. Figure 4 and Figure 4A The specific role of the SSC mode in is different. Figure 4 The SSC mode in is a specified mode, used to indicate that the PDN connection can be moved to the second communication system, Figure 4A The SSC mode in is the SSC mode of the PDN connection corresponding to the PDU session in the second communication system expected by the UE.

[0258] Step 201a: During the process of establishing a PDN connection in the first communication system, the UE sends second information to the first core network entity, where the second information is used to indicate the SSC mode of the PDN connection corresponding to the PDU session in the second communication system.

[0259] Specifically, during the process of establishing the PDN connection in the first communication system, the UE may send the second information to the first core network entity through the PCO, that is, the second information is included in the PCO, and the PCO may be a common PCO or an extended PCO.

[0260] In step 201a, the UE may first send an attach request message or a PDU session establishment request message to the MME, wherein the PCO of the message includes the second information. The MME sends a create session request to the first core network entity through the SGW, wherein the create session request includes the PCO.

[0261] Step 201b: The first core network entity receives second information sent by the UE, where the second information is used to indicate the SSC mode of the PDU session corresponding to the PDN connection in the second communication system.

[0262] After the first core network entity receives the second information, the first core network entity may determine the SSC mode of the PDU session corresponding to the PDN connection in the second communication system based on the SSC mode indicated by the second information; or, the first core network entity may determine the SSC mode of the PDU session corresponding to the PDN connection in the second communication system based on the SSC mode indicated by the second information and the subscription data of the UE. The SSC mode of the determined PDU session may be the indicated SSC mode or other SSC modes. For example, if the UE requests SSC mode 1 and the UE's subscription supports SSC modes 1 and 2, the SSC mode of the determined PDU session is 1; if the UE requests SSC mode 1 and the UE's subscription supports SSC mode 2, the SSC mode of the determined PDU session is 2.

[0263] Furthermore, in step 204, the process of the UE moving from the first communication system to the second communication system can be divided into two different situations depending on whether the UE is in an idle state or a connected state. These two situations are described below. Specifically, the UE moving from the first communication system to the second communication system in the idle state may involve the UE moving to the second communication system through a reselection process. For example, the UE detects that the signal of a base station of the first communication system has weakened, initiates a cell search process, and after finding the signal of a base station of the second communication system, reselects to a base station of the second communication system. Specifically, the UE moving from the first communication system to the second communication system in the connected state may involve the UE moving to the second communication system through a handover process. For example, the base station of the first communication system receives a measurement report reported by the UE and determines that the UE should be handed over to a base station of the second communication system. The base station of the first communication system then initiates a handover process. When the UE receives a handover command sent by the base station of the first communication system, the UE moves from the first communication system to the second communication system.

[0264] The first method is that the UE moves from the first communication system to the second communication system in an idle state. The UE moves from the first communication system to the second communication system in an idle state in the following two ways (I) and (II), which are described in detail below.

[0265] (I) The UE generates first EPS bearer status information based on the second condition and sends the first EPS bearer status information to the second core network entity, so that the second core network entity returns a second message, the second message including the second EPS bearer status information. The second core network entity is a core network entity in the second communication system responsible for UE access and mobility management, such as an AMF. Accordingly, the first condition in step 205 may also include the second EPS bearer status information.

[0266] The second condition includes the correspondence relationship saved by the UE in step 203, that is, the correspondence relationship between the EBI of the first EPS bearer and the first QoS flow information, or the correspondence relationship between the first EPS bearer and the first QoS flow information.

[0267] In addition, the EPS bearer status information is a phrase, and the "first" in the first EPS bearer status information and the "second" in the second EPS bearer status information are used to define and distinguish different EPS bearer status information. The first EPS bearer status information is used to identify the EPS bearer of the UE that is in the active state and has corresponding QoS flow information, that is, the EPS bearer identified in the first EPS bearer status information is the EPS bearer of the UE that is in the active state and has corresponding QoS flow information determined by the UE according to the corresponding relationship. The second EPS bearer status information is used to identify the EPS bearer of the UE that is in the active state and has corresponding QoS flow information determined by the second core network entity. For example, the UE has 4 active EPS bearers in the first communication system, and the EBIs corresponding to these 4 EPS bearers are 5, 6, 7, and 8 respectively. Among them, 5 and 7 have corresponding QoS flow information, and 6 and 8 do not have corresponding QoS flow information. Then, in the first EPS bearer status information reported by the UE, only 5 and 7 are marked as active, and the other bearers are marked as inactive. The details are shown in Table 2 below.

[0268] Table 2

[0269] EBI 7 6 5 4 3 2 1 0 Value 1 0 1 0 0 0 0 0 EBI 15 14 13 12 11 10 9 8 Value 0 0 0 0 0 0 0 0

[0270] Specifically, the UE generates first EPS bearer state information based on the second condition and sends it to the second core network entity. The second core network entity may receive the first EPS bearer state information and obtain the UE's PDN connection context from the core network entity (MME) of the first communication system. The second core network entity may determine the second information based on the sixth condition, which includes the first EPS bearer state information and the PDN connection context. The second core network entity may send the second information to the first core network entity. The first core network entity may generate QoS flow information used by the UE in the second communication system based on the fifth condition. The QoS flow information includes QoS flow information corresponding to the EPS bearer of the UE that is in an active state, as determined by the second core network entity. The fifth condition includes a correspondence between the second information and the first core network entity. The first core network entity may then send third information to the second core network entity. The third information is the bearer identifier of the EPS bearer corresponding to the generated QoS flow information, so that the second core network entity may generate second EPS bearer state information based on the seventh condition and send it to the UE via a second message. The seventh condition includes the third information. The QoS flow information may be understood as a collection of one or more QoS flow information or a collection of information about one or more PDU sessions. It is understandable that if there is only one QoS flow information or only one PDU session information in the QoS flow information, then there is only one QoS flow information or one PDU session information in the set. The rest of this article has the same understanding and will not be repeated here.

[0271] The second information includes an EPS bearer identifier EBI that can be moved to the second communication system; or a linked bearer identifier (LBI) and an EPS bearer identifier EBI; or includes a PDN connection context, and the PDN connection uplink includes an EPS bearer context that can be moved to the second communication system. If the second information includes an EPS bearer identifier EBI that can be moved to the second communication system; or a linked bearer identifier and an EPS bearer identifier, when the first core network entity generates QoS flow information, it generates the second QoS flow information based on the EPS bearer identifier EBI and the saved correspondence; or based on the linked bearer identifier and the EPS bearer identifier, and the saved correspondence. If the second information includes the above-mentioned PDN connection context, the first core network entity maps the PDN connection context to the second QoS flow information based on the saved correspondence.

[0272] In the embodiment of the present application, the first core network entity may be SMF+PGW-C, and the second core network entity may be AMF. Figure 5 As shown, the UE can send a registration request to the AMF, and the registration request can carry the identifier of the UE and the first EPS bearer status information. When the AMF receives the registration request, the AMF can obtain the MME serving the UE based on the identifier of the UE, and request the PDN connection context of the UE from the MME. The AMF performs an authentication process on the UE, and returns a PDN connection context confirmation message to the MME, and sends an update location request to the UDM+HSS, and the UDM+HSS returns a response message. Based on the first EPS bearer status information sent by the UE and the PDN connection context obtained from the MME, the AMF obtains the PDN connection that can be moved from the first communication system (for example, 4G) to the second communication system (for example, 5G) and the EPS bearer within the PDN connection, and obtains the corresponding SMF+PGW-C address. Afterwards, the AMF obtains the link bearer identifier and bearer identifier corresponding to the PDN connection that can be moved to the second communication system, and sends them to the SMF+PGW-C. The SMF+PGW-C generates the second QoS flow information based on the saved correspondence and the link bearer identifier and bearer identifier; or, the AMF obtains the PDN connection context that can be moved to the second communication system, and sends it to the SMF+PGW-C. The SMF+PGW-C maps the received PDN connection context to the second QoS flow information based on the saved correspondence. Finally, the SMF+PGW-C sends the bearer identifier of the EPS bearer corresponding to the second QoS flow information to the AMF, so that the AMF generates the second EPS bearer status information based on the bearer identifier and returns the second EPS bearer status information to the UE through the registration reception message.

[0273] Accordingly, the above step 205 specifically includes: the UE determines the QoS flow information used by the UE in the second communication system according to the stored correspondence relationship and the second EPS bearer state information.

[0274] Optionally, the process in which the above-mentioned AMF obtains a PDN connection that can be moved from a first communication system (e.g., 4G) to a second communication system (e.g., 5G) and an EPS bearer within the PDN connection, and obtains the corresponding SMF+PGW-C address may include: the AMF obtains the PDN connection that can be moved to the second communication system and the EPS bearer within the PDN connection based on the intersection of the first EPS bearer status information and the EPS bearer in the bearer context in the PDN connection context; the AMF can obtain the SMF+PGW-C address based on the PDN connection context.

[0275] Specifically, when the first message is a registration acceptance message, the first QoS flow information is included in the N1 session management information (N1SM Information) parameter; or, the first message is a PDU session modification message, the first QoS flow information is included in the N1 session management information parameter of the PDU session modification message.

[0276] (II) The UE generates first QoS flow state information based on the third condition and sends the first QoS flow state information to the second core network entity, so that the second core network entity returns a second message, the second message including the second QoS flow state information. The second core network entity is a core network entity responsible for access and mobility management of the UE in the second communication system. Accordingly, the first condition in step 205 may also include the second QoS flow state information.

[0277] Among them, the third condition includes the correspondence saved by the UE in the above step 203, that is, the correspondence between the EBI of the first EPS bearer and the first QoS flow information, or the correspondence between the first EPS bearer context and the first QoS flow information, or the correspondence between the first EPS bearer context and the index information of the first QoS flow.

[0278] In addition, the QoS flow status information is a phrase, and the "first" in the first QoS flow status information and the "second" in the second QoS flow status information are used to define and distinguish different QoS flow status information. The first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state, that is, the QoS flow identified in the first QoS flow status information is the QoS flow corresponding to the EPS bearer in the activated state determined by the UE according to the corresponding relationship. The second QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state determined by the second core network entity. Here, the QoS flow corresponding to the EPS bearer of the UE in the activated state can be understood as the QoS flow corresponding to the EPS bearer in the activated state and having a QoS flow corresponding to it. That is, the EPS bearer in the activated state can be understood as the EPS bearer in the activated state and having a QoS flow corresponding to it. The other parts of this article have the same understanding and will not be repeated.

[0279] Specifically, the UE generates first QoS flow state information according to the third condition and sends it to the second core network entity. The second core network entity receives the first QoS flow state information, obtains the PDN connection context of the UE from the core network entity MME of the first communication system, and sends the first QoS flow state information and the PDN connection context to the first core network entity, so that the first core network entity generates second QoS flow information of the UE in the second communication system according to the fifth condition, and the fifth condition includes the first QoS flow state information and the PDN connection context. Afterwards, the first core network entity can return the second QoS flow information to the second core network entity, so that the second core network entity generates the second QoS flow state information, that is, the second information determined by the second core network entity, and returns the second QoS flow state information to the UE through the second message.

[0280] In the embodiment of the present application, the first core network entity may be SMF+PGW-C, and the second core network entity may be AMF. Figure 6As shown, the UE can send a registration request to the AMF, and the registration request can carry the identifier of the UE and the first QoS flow status information. When the AMF receives the registration request, the AMF can obtain the MME serving the UE based on the identifier of the UE, and request the PDN connection context of the UE from the MME. The AMF performs an authentication process on the UE, returns a PDN connection context confirmation message to the MME, and sends an update location request to the UDM+HSS, and the UDM+HSS returns a response message. The AMF learns that the PDN connection can be moved to the second communication system based on the fact that the SMF+PGW-C in the PDN connection context is a common network element for the first communication system (for example, 4G) and the second communication system (for example, 5G). The AMF sends the obtained PDN connection context and the first QoS flow status information to the SMF+PGW-C. The SMF+PGW-C maps the PDN connection context to the QoS flow information, and determines the intersection of the first QoS flow status information and the mapped QoS flow information as the second QoS flow information. It can also delete the QoS flow that is not described in the QoS flow information. Afterwards, SMF+PGW-C returns the second QoS flow information to AMF. AMF generates second QoS flow status information based on the second QoS flow information, and returns the second QoS flow status information to the UE through a registration reception message.

[0281] Accordingly, the above step 205 specifically includes: the UE determines the QoS flow information used by the UE in the second communication system according to the stored corresponding relationship and the second QoS flow state information.

[0282] It should be noted that the first EPS bearer status information and the first QoS flow status information in the above methods (I) and (II) can be collectively referred to as first status information, and the second EPS bearer status information and the second QoS flow status information can be collectively referred to as second status information.

[0283] The second process of the UE moving from the first communication system to the second communication system in the connected state may include: the UE receiving a handover command (Handover Command) sent by the base station of the first communication system, the handover command including the session identifier and the QoS flow identifier. Accordingly, the first condition in step 205 may also include the session identifier and the QoS flow identifier.

[0284] In the embodiment of the present application, the first core network entity may be SMF+PGW-C, and the second core network entity may be AMF. Figure 7As shown, when the base station of the first communication system (for example, a 4G base station) determines that the UE needs to move from the first communication system to the second communication system, the base station sends a handover request to the core network entity MME of the first communication system. When the MME receives the handover request, the MME sends a relocation request to the core network entity AMF of the second communication system, and the relocation request includes the PDN connection context of the UE. Based on the PDN connection context, the AMF obtains the SMF+PGW-C that provides services for the UE, and sends a session management (SM) context request message to the SMF+PGW-C, and the request message includes the PDN connection context. When the SMF+PGW-C receives the SM context request message, it determines the PDU session information (which may also be the PDU session context) in the second communication system corresponding to the PDN connection context based on the PDN connection context and the saved correspondence. Afterwards, the SMF+PGW-C sends an N4 session establishment request to the UPF+PGW-U and sends an SM context response message to the AMF, and the response message includes the PDU session information. The AMF sends a handover request to the base station of the second communication system, which includes the PDU session information. The base station of the second communication system returns the wireless resource information allocated for the UE to the AMF. The AMF sends an SM context update message to the SMF+PGW-C. The update message is used to establish a tunnel between the UPF+PGW-U and the base station of the second communication system. The AMF sends a location update response message to the MME, which includes the wireless resource information allocated for the UE by the base station of the second communication system. The MME sends a create forwarding tunnel request to the SGW and sends a handover instruction containing the wireless resource information allocated for the UE to the base station of the first communication system. The base station of the first communication system sends a handover instruction to the UE, which includes the wireless resource information allocated for the UE. The wireless resource information includes a session identifier and a QoS flow identifier.

[0285] Specifically, the process in which the SMF sends an SM context request message to the SMF+PGW-C, and the SMF+PGW-C determines the PDU session information in the second communication system, may include: the AMF obtains a PDN connection that can be moved from the first communication system to the second communication system and an EPS bearer within the PDN connection, and obtains the address, link bearer identifier, and bearer identifier of the corresponding SMF+PGW-C. The AMF sends the link bearer identifier and bearer identifier to the SMF+PGW-C, and the SMF+PGW-C determines the PDU session information based on the link bearer identifier and bearer identifier, as well as a stored correspondence. Alternatively, the AMF obtains a PDN connection that can be moved from the first communication system to the second communication system and an EPS bearer within the PDN connection, and obtains the address of the corresponding SMF+PGW-C and a PDN connection context containing an EPS bearer context that can be moved to the second communication system. The AMF sends the PDN connection context to the SMF+PGW-C, and the SMF+PGW-C determines the PDU session information based on the PDN connection context and the stored correspondence.

[0286] Accordingly, the above step 205 specifically includes: the UE determines the QoS flow information used by the UE in the second communication system according to the first QoS flow information, the session identifier and the QoS flow identifier.

[0287] Furthermore, after step 203 and before step 204, that is, after the UE receives the first message and before the UE moves from the first communication system to the second communication system, the method further includes: steps 203a and 203b.

[0288] Step 203a: The UE receives a fourth message, where the fourth message is used to delete the first EPS bearer.

[0289] Among them, the fourth message can be the above Figure 1 The fourth message sent by the MME in the first communication system to the UE, that is, the MME sends to the UE to instruct the UE to delete the first EPS bearer.

[0290] Step 203b: The UE deletes the first EPS bearer and the first QoS flow information corresponding to the first EPS bearer.

[0291] Specifically, when the UE deletes the first QoS flow information corresponding to the first EPS bearer, if the UE saves the first QoS flow information in the above step 203, the saved first QoS flow information is deleted; if the UE saves the correspondence between the bearer identifier of the first EPS bearer and the first QoS flow information, or the correspondence between the first EPS bearer context and the first QoS flow information, or the correspondence between the first EPS bearer context and the index information of the first QoS flow in the above step 203, the UE deletes the saved correspondence.

[0292] For further information, see Figure 8 After the UE determines the QoS flow information used by the UE in the second communication system according to the first condition, the method may further include: step 205a. Figure 8 Only in Figure 4 As an example, Figure 5 The shown method for mobility between communication systems is also applicable.

[0293] Step 205a: The UE deletes the context of the second EPS bearer, which is an EPS bearer that has no corresponding QoS flow information in the UE. In the inter-communication system mobility method provided in the embodiment of the present application, when the UE establishes a PDN connection, the UE instructs the first core network entity through the first information to determine the first QoS flow information in the second communication system corresponding to the first EPS bearer of the UE in the first communication system. Afterwards, the first core network entity determines and saves the first QoS flow information, and sends the first QoS flow information to the UE through the first message. When the UE moves from the first communication system to the second communication system, the UE and the first core network entity can determine the QoS flow information used by the UE in the second communication system based on the first QoS flow information, thereby realizing the mapping between the first EPS bearer and the first QoS flow information when the UE moves from the first communication system to the second communication system, and the alignment of the activated bearers, to ensure that the UE seamlessly transfers to the second communication system.

[0294] Figure 9 This is a flow chart of a method for moving between communication systems provided in an embodiment of the present application, see Figure 9 , this method is applied to the above Figure 1 The communication system shown is used to move a UE from a first communication system to a second communication system. The method may include the following steps.

[0295] Step 301: The UE establishes a first EPS bearer in a first communication system and moves from the first communication system to a second communication system.

[0296] The PDN connection in the first communication system corresponds to the PDU session in the second communication system, a PDN connection may include multiple EPS bearers, a PDU session may include multiple QoS flows, and the UE may establish multiple PDN connections in the first communication system, among which one or more PDN connections may be movable to the second communication system. A PDN connection movable to the second communication system means that the PGW used by the PDN connection is a SMF+PGW-C jointly established by 4G and 5G; or, when the UE moves from the first communication system to the second communication system, a PDU session corresponding to the PDN connection may be established in the second communication system, and the PDN connection and the PDU session have the same IP address; or, the PGW used by the PDN connection is a SMF+PGW-C jointly established by 4G and 5G, and when the UE moves from the first communication system to the second communication system, a PDU session corresponding to the PDN connection may be established in the second communication system, and the PDN connection and the PDU session have the same IP address. The first EPS bearer refers to an EPS bearer included in the PDN connection established by the UE in the first communication system, and may be one EPS bearer or a group of EPS bearers.

[0297] In an embodiment of the present application, the first communication system may be a 4G communication system, and the second communication system may be a 5G communication system, so that the UE may establish a first EPS bearer in the 4G communication system, and after establishing the first EPS bearer, move from the 4G communication system to the 5G communication system.

[0298] Step 302: The UE receives a first message, where the first message includes first QoS flow information of a second communication system corresponding to a first EPS bearer.

[0299] The first QoS flow corresponds to the first EPS bearer, and the first QoS flow may include one QoS flow or a group of QoS flows. The first QoS flow information refers to the information obtained after mapping the first EPS bearer to a QoS flow in the second communication system. The first QoS flow information includes the QoS information of the QoS flow, for example, mapping according to a predefined mapping rule, or generating the first QoS flow information according to the first EPS bearer. A combination of one or more information of the QoS flow identifier QFI and the QoS flow template. The QoS information may further include a combination of one or more information of the 5QI, ARP, GFBR, MFBR, and notification control corresponding to the QoS. Not all EPS bearers on the UE can be moved to the second communication system, for example, non-GBR EPS bearers cannot be moved to the second communication system, or when the PDN connection cannot be moved to the second communication system, all EPS bearers of the PDN connection cannot be moved to the second communication system. There is no corresponding QoS flow information for EPS bearers that cannot be moved to the second communication system.

[0300] In an embodiment of the present application, the first QoS flow information may include one or more QoS rules. When the first EPS bearer is the default bearer, the first QoS flow information includes one or more of the following information: session aggregation maximum bit rate (session AMBR), SSC mode, PDU session identifier, QoS rule. The QoS rule can be one QoS rule or multiple QoS rules. Specifically, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority (precedence), packet filter (packet filter); or, the QoS rule includes one or more of the following information: QoS rule identifier, QoS flow identifier, priority, packet filter identifier. Among them, the packet filter includes packet filter attributes and packet filter identifier. Further, the first QoS flow information may also include a combination of one or more information of 5QI, ARP, GFBR, MFBR, and notification control corresponding to the QoS flow. It can be understood that the default bearer of the UE is established during the process of the UE establishing a PDN connection in the first communication system. That is, establishing a default bearer for the UE can be understood as the UE establishing a PDN connection. The UE may specifically request to establish a PDN connection through an attach request or a PDN Connectivity Request request. During the process of establishing a PDN connection for the UE by the first communication system, information about the PDU session of the second communication system corresponding to the PDN connection is sent to the UE through a request message for establishing a default bearer. The PDU session information includes one or more of a session aggregation maximum bit rate (session AMBR), an SSC mode, and a PDU session identifier.

[0301] Exemplarily, the method for SMF+PGW-C to determine the first QoS flow information of the 5G communication system may be: SMF+PGW-C generates a 5G QoS rule based on the service flow template (TFT) of the EPS context. Specifically comprising: generating a QoS rule based on one or more policy and charging control (PCC) rules for generating EPS bearer TFT. The priority of each PCC is set to the priority of the QoS rule, and the one or more packet filters of the PCC are set to the packet filter of the QoS rule. In addition, SMF+PGW-C may also assign a QoS rule identifier to the QoS rule. Exemplarily, SMF+PGW-C may also set the QCI of the EPS bearer to the 5QI of 5G, the GBR of the EPS bearer to the GFBR of 5G, the MBR of the EPS bearer to the MFBR of 5G, and the EBI of the default bearer of the PDN connection to the PDU session identifier of 5G.

[0302] Furthermore, the method may further include: the UE obtaining a first QoS flow identifier (QFI), wherein the first QoS flow identifier is obtained by the UE adding a specific value to the first EPS bearer identifier (EBI); or, the first QoS flow identifier is obtained by the UE adding a specific field to the first EPS bearer identifier.

[0303] For example, QFI is obtained by increasing EBI by a specific value. For example, if the specific value is 10, if EBI is 5, QFI is 15; if EBI is 6, QFI is 16. For another example, QFI is obtained by adding a specific field to EBI. For example, if the specific field is one byte, QFI is obtained by adding one byte to EBI. For example, if one byte of EBI is 00000101, the two bytes after adding one byte to QFI are 0000010100000001.

[0304] It should be noted that the specific value and the specific numerical value of the specific field can be set as needed, and the embodiment of the present invention does not specifically limit this.

[0305] In addition, the first message may be sent by the second core network entity to the UE, that is, before the second core network entity sends the first message, the second core network entity may determine the first QoS flow information and send the first QoS flow information to the UE through the first message, so that the UE receives the first message sent by the second core network entity containing the first QoS flow information of the second communication system corresponding to the first EPS bearer. The second core network entity may be a core network entity in the second communication system responsible for access and mobility management of the UE, and the second core network entity may be the above-mentioned Figure 1AMF in the second communication system shown.

[0306] In an embodiment of the present application, the first message may be a registration acceptance message, wherein the N1 session management information parameter (N1 SM Information) of the registration acceptance message includes the first QoS flow information; or the first message may be a PDU session modification message, wherein the N1 session management information parameter of the PDU session modification message includes the first QoS flow information. Alternatively, the first message may be a handover command message, wherein the handover command message includes the first QoS flow information. QoS flow information in a 5G communication system may also be referred to as a 5G QoS parameter.

[0307] Specifically, when the first message is a handover command message, the target-to-source transparent container of the handover command message includes the first QoS flow information. The access layer of the UE can obtain the first QoS flow information from the target-to-source transparent container and send it to the non-access layer of the UE.

[0308] Furthermore, the first message may also include information about a first EPS bearer corresponding to the first QoS flow information, and the information about the first EPS bearer may include a bearer identifier of the first EPS bearer. Specifically, the second core network entity may include the information about the first EPS bearer and the first QoS flow information in the first message and send it to the UE via the first message.

[0309] Step 303: The UE determines the QoS flow information used by the UE in the second communication system according to a first condition, where the first condition includes first QoS flow information.

[0310] Among them, the QoS flow information used by the UE in the second communication system can be the QoS flow information corresponding to one or more PDU sessions of the UE, or it can be the information of one or more PDU sessions of the UE. The embodiment of the present application does not specifically limit this.

[0311] Specifically, the UE determines the QoS flow information that the UE can use in the second communication system based on the first QoS flow information included in the first condition, thereby realizing the mapping of the EPS bearer of the UE in the first communication system and the QoS flow in the second communication system, so that the UE can be seamlessly transferred from the first communication system to the second communication system.

[0312] It should be noted that the process of the UE moving from the first communication system to the second communication system in the above step 301 and step 303 can be in no particular order, that is, the UE can first move from the first communication system to the second communication system, and then determine the QoS flow information used in the second communication system; or, the UE first determines the QoS flow information used in the second communication system, and then moves from the first communication system to the second communication system; or, the UE determines the QoS flow information used in the second communication system during the process of moving from the first communication system to the second communication system. The embodiments of the present application do not specifically limit this. Figure 9 In the description, the process of UE moving from the first communication system to the second communication system is taken as an example before step 303.

[0313] Furthermore, in step 301 above, the process of the UE moving from the first communication system to the second communication system can be divided into two different situations depending on whether the UE is in an idle state or a connected state. These two situations are described below. The UE moving from the first communication system to the second communication system in the idle state specifically involves the UE moving to the second communication system through a reselection process. For example, the UE detects that the signal of the base station of the first communication system has weakened, and the UE initiates a cell search process. After searching for the signal of the base station of the second communication system, the UE reselects to the base station of the second communication system. The UE moving from the first communication system to the second communication system in the connected state specifically involves the UE moving to the second communication system through a handover process. For example, the base station of the first communication system receives a measurement report reported by the UE and determines that the UE should be handed over to the base station of the second communication system. The base station of the first communication system then initiates a handover process. When the UE receives a handover command sent by the base station of the first communication system, the UE moves from the first communication system to the second communication system.

[0314] The first method is that the UE moves from the first communication system to the second communication system in an idle state. The UE moves from the first communication system to the second communication system in an idle state in the following two ways (1) and (2), which are described in detail below.

[0315] (1) The UE sends first EPS bearer status information to the second core network entity, where the first EPS bearer status information is used to identify the EPS bearer of the UE that is in an activated state. The second core network entity is a core network entity in the second communication system that is responsible for access and mobility management of the UE.

[0316] Among them, the EPS bearer status information is a phrase, and the "first" in the first EPS bearer status information and the "second" in the second EPS bearer status information are used to define and distinguish different EPS bearer status information. The first EPS bearer status information is used to identify the EPS bearer in the activated state, that is, the EPS bearer identified in the first EPS bearer status information is the EPS bearer in the activated state determined by the UE. For example, the UE has 4 EPS bearers in the first communication system, and the EBIs corresponding to these 4 EPS bearers are 5, 6, 7, and 8 respectively. Among them, 5 and 7 have corresponding QoS flow information, and 6 and 8 do not have corresponding QoS flow information. Then, in the first EPS bearer status information reported by the UE, only 5 and 7 are identified as activated, and other bearers are identified as inactive. The details are shown in Table 2 above.

[0317] Specifically, the UE may determine a first EPS bearer state based on the activated EPS bearer and send the first EPS bearer state to the second core network entity. The second core network entity receives the first EPS bearer state information and obtains a PDN connection context containing all PDN connections of the UE from the core network entity MME of the first communication system. Based on the first EPS bearer state information and the PDN connection context, the second information is determined. The second information contains EPS bearers that can be moved to the second communication system, and the PDN connection context corresponding to the EPS that can be moved to the second communication system is obtained. The second core network entity sends the obtained PDN connection context to the first core network entity, so that the first core network entity generates QoS flow information for use by the UE in the second communication system. The QoS flow information includes QoS flow information corresponding to the activated EPS bearer of the UE determined by the first core network entity. The first core network entity may then send the second QoS flow information to the second core network entity, so that the second core network entity sends it to the UE. The QoS flow information can be understood as a collection of one or more QoS flow information or a collection of information about one or more PDU sessions. It is understandable that if there is only one QoS flow information or only one PDU session information in the QoS flow information, then there is only one QoS flow information or one PDU session information in the set. The rest of this article has the same understanding and will not be repeated here.

[0318] In the embodiment of the present application, the first core network entity may be SMF+PGW-C, and the second core network entity may be AMF. Figure 10As shown, the UE can send a registration request to the AMF, and the registration request can carry the UE's identifier and the first EPS bearer status information. When the AMF receives the registration request, the AMF can obtain the MME serving the UE based on the UE's identifier and request the MME for the UE's PDN connection context. The AMF performs an authentication process on the UE and returns a PDN connection context confirmation message to the MME, and sends an update location request to the UDM+HSS, which returns a response message. Based on the first EPS bearer status information sent by the UE and the PDN connection context obtained from the MME, the AMF obtains the PDN connection that can be moved from the first communication system (e.g., 4G) to the second communication system (e.g., 5G) and the EPS bearer within the PDN connection, and obtains the corresponding SMF+PGW-C address and PDN connection context. Afterwards, the AMF obtains the PDN connection context that can be moved to the second communication system and sends it to the SMF+PGW-C. The SMF+PGW-C generates the second QoS flow information based on the received PDN connection context. Finally, the SMF+PGW-C sends the generated second QoS flow information to the AMF, so that the AMF returns the second QoS flow information to the UE through a registration acceptance message. The UE can then save the second QoS flow information and delete the EPS bearer that does not correspond to the QoS flow in the first EPS bearer.

[0319] Correspondingly, the above step 303 specifically includes: the UE determines the QoS flow information used by the UE in the second communication system according to the first QoS flow information and the second QoS flow information.

[0320] Optionally, the process in which the above-mentioned AMF obtains a PDN connection that can be moved from a first communication system (e.g., 4G) to a second communication system (e.g., 5G) and an EPS bearer within the PDN connection, and obtains the corresponding SMF+PGW-C address may include: the AMF obtains the PDN connection that can be moved to the second communication system and the EPS bearer within the PDN connection based on the intersection of the first EPS bearer status information and the EPS bearer in the bearer context in the PDN connection context; the AMF obtains the SMF+PGW-C address based on the PDN connection context that can be moved to the second communication system.

[0321] (2) The UE generates first QoS flow state information according to a second condition, where the second condition includes an EPS bearer of the UE being in an activated state, and the UE sends the first QoS flow state information to the second core network entity.

[0322] Among them, QoS flow status information is a phrase, and the "first" in the first QoS flow status information and the "second" in the second QoS flow status information described below are used to define and distinguish different QoS flow status information. The first QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state, that is, the QoS flow identified in the first QoS flow status information is the QoS flow corresponding to the EPS bearer in the activated state determined by the UE. The second QoS flow status information is used to identify the QoS flow corresponding to the EPS bearer of the UE in the activated state determined by the second core network entity.

[0323] Specifically, the UE generates first QoS flow state information based on the EPS bearer of the UE in the activated state and sends it to the second core network entity. The second core network entity receives the first QoS flow state information, obtains the PDN connection context of the UE from the core network entity MME of the first communication system, and sends the first QoS flow state information and the PDN connection context to the first core network entity, so that the first core network entity generates second QoS flow information for the UE in the second communication system. Afterwards, the first core network entity can return the second QoS flow information to the second core network entity, so that the second core network entity sends the second QoS flow state information to the UE through a registration acceptance message.

[0324] In the embodiment of the present application, the first core network entity may be SMF+PGW-C, and the second core network entity may be AMF. Figure 11As shown, the UE can send a registration request to the AMF, and the registration request can carry the identifier of the UE and the first QoS flow status information. When the AMF receives the registration request, the AMF can obtain the MME serving the UE based on the identifier of the UE, and request the PDN connection context of the UE from the MME. The AMF performs an authentication process on the UE, returns a PDN connection context confirmation message to the MME, and sends an update location request to the UDM+HSS, and the UDM+HSS returns a response message. The AMF learns that the PDN connection can be moved to the second communication system based on the fact that the SMF+PGW-C in the PDN connection context is a common network element for the first communication system (for example, 4G) and the second communication system (for example, 5G). The AMF sends the obtained PDN connection context and the first QoS flow status information to the SMF+PGW-C. The SMF+PGW-C maps the PDN connection context to the QoS flow information, and determines the intersection of the first QoS flow status information and the mapped QoS flow information as the second QoS flow information. It can also delete the QoS flow that is not described in the QoS flow information. Afterwards, the SMF+PGW-C returns the second QoS flow information to the AMF. The AMF generates second QoS flow state information based on the second QoS flow information and returns the second QoS flow state information to the UE through a registration accept message. The UE can then save the second QoS flow information and delete the EPS bearer that does not correspond to the QoS flow in the first EPS bearer.

[0325] Correspondingly, the above step 303 specifically includes: the UE determines the QoS flow information used by the UE in the second communication system according to the first QoS flow information and the second QoS flow information.

[0326] Second, a process in which the UE moves from the first communication system to the second communication system in a connected state may include: the UE receiving a handover instruction sent by a base station of the first communication system, where the handover instruction includes a session identifier and a QoS flow identifier.

[0327] In the embodiment of the present application, the first core network entity may be SMF+PGW-C, and the second core network entity may be AMF. Figure 12As shown, when the base station of the first communication system (for example, E-UTRAN) determines that the UE needs to move from the first communication system to the second communication system, the base station sends a handover request to the core network entity MME of the first communication system. When the MME receives the handover request, the MME sends a relocation request to the core network entity AMF of the second communication system, and the relocation request includes the PDN connection context of the UE. Based on the PDN connection context, the AMF obtains the SMF+PGW-C that provides services for the UE, and sends a session management (SM) context request message to the SMF+PGW-C, and the request message includes the PDN connection context. When the SMF+PGW-C receives the SM context request message, it determines the PDU session context in the second communication system corresponding to the PDN connection context based on the PDN connection context. Afterwards, the SMF+PGW-C sends an N4 session establishment request to the UPF+PGW-U and an SM context response message to the AMF, and the response message includes the PDU session information. The AMF sends a handover request to the base station of the second communication system, which includes the PDU session information. The base station of the second communication system returns the wireless resource information allocated to the UE to the AMF. The AMF sends an SM context update message to the SMF+PGW-C. The update message is used to establish a tunnel between the UPF+PGW-U and the base station of the second communication system. The AMF sends a location update response message to the MME, which includes the wireless resource information and PDU session context allocated to the UE by the base station of the second communication system. The MME sends a create forwarding tunnel request to the SGW and sends a handover instruction containing the PDU session context and the wireless resource information allocated to the UE to the base station of the first communication system. The base station of the first communication system sends a handover instruction to the UE, which includes the PDU session context and the wireless resource information allocated to the UE. The wireless resource information includes the session identifier and the QoS flow identifier.

[0328] Optionally, in the above embodiment, the process in which the AMF sends the PDU session context to the UE may also be as follows: the AMF sends the PDU session context to the base station of the second communication system, and the base station of the second communication system encapsulates it in a target-to-source transparent container and sends it to the AMF. Thereafter, the AMF sends it to the UE via the MME and the base station of the first communication system. The process in which the AMF allocates radio resource information to the UE is consistent with the above description.

[0329] Specifically, the process in which the SMF sends an SM context request message to the SMF+PGW-C, and the SMF+PGW-C determines the PDU session information in the second communication system, may include: the AMF obtains a PDN connection that can be moved from the first communication system to the second communication system and an EPS bearer within the PDN connection, and obtains the address, link bearer identifier, and bearer identifier of the corresponding SMF+PGW-C. The AMF sends the link bearer identifier and bearer identifier to the SMF+PGW-C, and the SMF+PGW-C determines the PDU session information based on the link bearer identifier and bearer identifier, as well as a stored correspondence. Alternatively, the AMF obtains a PDN connection that can be moved from the first communication system to the second communication system and an EPS bearer within the PDN connection, and obtains the address of the corresponding SMF+PGW-C and a PDN connection context containing an EPS bearer context that can be moved to the second communication system. The AMF sends the PDN connection context to the SMF+PGW-C, and the SMF+PGW-C determines the PDU session information based on the PDN connection context and the stored correspondence.

[0330] Accordingly, the above step 303 specifically includes: the UE determines the QoS flow information used by the UE in the second communication system according to the first QoS flow information, the session identifier and the QoS flow identifier.

[0331] For further information, see Figure 13 , after step 303, the method may further include: step 304.

[0332] Step 304: The UE deletes the context of the second EPS bearer, where the second EPS bearer is an EPS bearer of the UE that is not included in the first message, or an EPS bearer of the UE that has no corresponding QoS flow information.

[0333] In the method for inter-communication system mobility provided in an embodiment of the present application, the UE establishes a first EPS bearer in the first communication system, moves from the first communication system to the second communication system, and receives first QoS flow information corresponding to the first EPS bearer sent by the second core network entity. The QoS flow information used by the UE in the second communication system is determined according to the first condition containing the first QoS flow information, thereby realizing the mapping between the first EPS bearer and the first QoS flow information when the UE moves from the first communication system to the second communication system, and the alignment of the activated bearers, thereby ensuring that the UE seamlessly transfers to the second communication system.

[0334] The above mainly introduces the solution provided by the embodiment of the present application from the perspective of the interaction between various network elements. It can be understood that, in order to implement the above functions, each network element, such as the user equipment UE, the first core network device and the second core network device, includes a hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the network elements and algorithm steps of each example described in the embodiments disclosed in this document, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is executed in a hardware or computer software-driven hardware manner depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0335] The embodiment of the present application can divide the user equipment, the first core network device and the second core network device into functional modules according to the above method example. For example, each functional module can be divided according to each function, or two or more functions can be integrated into one processing module. The above-mentioned integrated module can be implemented in the form of hardware or in the form of software functional modules. It should be noted that the division of modules in the embodiment of the present application is schematic and is only a logical functional division. There may be other division methods in actual implementation.

[0336] In the case of dividing each functional module into corresponding functional modules, Figure 14 A possible structural diagram of the user equipment involved in the above embodiment is shown, and the user equipment 300 includes: a receiving unit 301, a storage unit 302, a moving unit 303 and a determining unit 304. The receiving unit 301 is used to perform Figure 3 、 Figure 4 or Figure 8 The step of receiving the first QoS flow information; the storage unit 302 is used to execute Figure 3 、 Figure 4 or Figure 8 The step of saving the first QoS flow information; Mobile unit 303, for executing Figure 3 、 Figure 4 or Figure 8 Step 204 in the determination unit 304, for executing Figure 3 、 Figure 4 or Figure 8 Further, the user equipment 300 further includes: a sending unit 305, and / or a deleting unit 306; wherein the sending unit 305 is used to perform Figure 4 or Figure 8 Step 200a in Figure 4A Step 201a of the step; the deletion unit 306 is used to perform Figure 8 All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0337] In hardware implementation, the moving unit 303 , determining unit 304 and deleting unit 306 may be processors; the receiving unit 301 may be a receiver; and the sending unit 305 may be a transmitter, which may form a communication interface with the receiver.

[0338] Figure 15 FIG. 3 is a diagram showing a possible logical structure of a user device 310 involved in the above-mentioned embodiment provided in an embodiment of the present application. The user device 310 includes: a processor 312, a communication interface 313, a memory 311, and a bus 314. The processor 312, the communication interface 313, and the memory 311 are interconnected via the bus 314. In the embodiment of the invention, the processor 312 is used to control and manage the actions of the user device 310, for example, the processor 312 is used to execute Figure 3 、 Figure 4 or Figure 8 Steps 203 and 204 in Figure 8 The communication interface 313 is used to support the user equipment 310 to communicate. The memory 311 is used to store program codes and data of the user equipment 310.

[0339] Among them, the processor 312 can be 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, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The bus 314 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 15 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0340] In the case of dividing each functional module into corresponding functional modules, Figure 16A possible structural diagram of the first core network device involved in the above embodiment is shown, and the first core network device 400 includes: a determining unit 401, a sending unit 402 and a storing unit 403. The determining unit 401 is used to execute Figure 3 or Figure 4 The step of determining the first QoS flow information in step 201, or Figure 8 The step of determining the first QoS flow information in step 200b and step 201; the sending unit 402 is used to perform Figure 3 、 Figure 4 or Figure 8 Step 202 in the storage unit 403 is used to execute Figure 3 、 Figure 4 or Figure 8 The step of saving the first QoS flow information in step 201; further, the first core network device 400 further includes: a receiving unit 404, the receiving unit 404 is used to perform Figure 4 The step of receiving the first information sent by the UE, Figure 4A Step 201b in the embodiment of the present invention, and / or other processes for the technology described herein. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

[0341] In hardware implementation, the above-mentioned determining unit 401 may be a processor; the sending unit 402 may be a transmitter; and the receiving unit 404 may be a receiver, which and the transmitter may form a communication interface.

[0342] Figure 17 As shown, a possible logical structure diagram of the first core network device 410 involved in the above embodiment provided in the embodiment of the present application is shown. The first core network device 410 includes: a processor 412, a communication interface 413, a memory 411 and a bus 414. The processor 412, the communication interface 413 and the memory 411 are interconnected via the bus 414. In the embodiment of the application, the processor 412 is used to control and manage the actions of the first core network device 410, for example, the processor 412 is used to execute Figure 3 or Figure 8 Steps 201 and 206 in Figure 4 The communication interface 413 is used to support the first core network device 410 to communicate. The memory 411 is used to store program code and data of the first core network device 410.

[0343] Among them, the processor 412 can be 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, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The bus 414 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 17 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0344] In the case of dividing each functional module into corresponding functional modules, Figure 18 A possible structural diagram of the second core network device involved in the above embodiment is shown. The second core network device 500 includes: an acquisition unit 501, a determination unit 502, and a sending unit 503. Among them, the acquisition unit 501 is used to execute the step of acquiring the first state information and the PDN connection context, and the step of receiving the third information sent by the first core network entity; the determination unit 502 is used to execute the step of determining the second information, and / or other processes for the technology described herein; the sending unit 503 is used to execute the step of sending the second information, and the step of sending the second message to the UE. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0345] In hardware implementation, the above-mentioned determination unit 502 may be a processor; the acquisition unit 501 may be a receiver; and the sending unit 503 may be a transmitter, which may form a communication interface with the receiver.

[0346] Figure 19 As shown, a possible logical structure diagram of the second core network device 510 involved in the above-mentioned embodiments provided in an embodiment of the present application is provided. The second core network device 510 includes: a processor 512, a communication interface 513, a memory 511 and a bus 514. The processor 512, the communication interface 513 and the memory 511 are interconnected via the bus 514. In an embodiment of the application, the processor 512 is used to control and manage the actions of the second core network device 510, for example, the processor 512 is used to execute the steps of determining the second information, and / or other processes for the technology described herein. The communication interface 513 is used to support the second core network device 510 to communicate. The memory 511 is used to store program code and data of the second core network device 510.

[0347] Among them, the processor 512 can be 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, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The bus 514 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 19 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0348] In the case of dividing each functional module into corresponding functional modules, Figure 20 A possible structural diagram of the user equipment involved in the above embodiment is shown, and the user equipment 600 includes: an establishment unit 601, a moving unit 602, a receiving unit 603 and a determining unit 604. The establishment unit 601 is used to perform Figure 9 or Figure 13 The step of establishing an EPS bearer in the first communication system in step 301; the mobile unit 602 is used to perform Figure 9 or Figure 13 The step of moving from the first communication system to the second communication system in step 301; the receiving unit 603 is used to perform Figure 9 or Figure 13 Step 302; the determination unit 604 is used to perform 9 or Figure 13 Further, the user equipment 600 further includes: a sending unit 605, and / or a deleting unit 606; wherein the sending unit 605 is configured to execute the step of sending the first EPS bearer state information to the second core network device, or the step of sending the first QoS flow state information to the second core network device; the deleting unit 606 is configured to execute Figure 13 Step 304 in the above method embodiment. All relevant contents of each step involved can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0349] In hardware implementation, the above-mentioned determination unit 604 and deletion unit 606 may be processors; the receiving unit 603 may be a receiver; and the sending unit 605 may be a transmitter, which may form a communication interface with the receiver.

[0350] Figure 21FIG. 6 is a diagram showing a possible logical structure of a user device 610 involved in the above-mentioned embodiments provided in an embodiment of the present application. The user device 610 includes: a processor 612, a communication interface 613, a memory 611, and a bus 614. The processor 612, the communication interface 613, and the memory 611 are interconnected via the bus 614. In the embodiment of the application, the processor 612 is used to control and manage the actions of the user device 610, for example, the processor 612 is used to execute 9 or Figure 13 Step 303, execute Figure 13 The communication interface 613 is used to support the user equipment 610 to communicate. The memory 611 is used to store program codes and data of the user equipment 610.

[0351] Among them, the processor 612 can be 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, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The bus 614 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 21 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0352] In the case of dividing each functional module into corresponding functional modules, Figure 22 A possible structural diagram of the first core network device involved in the above embodiment is shown, and the first core network device 700 includes: a receiving unit 701 and a determining unit 702. The receiving unit 701 is used to perform the step of receiving the first information sent by the second core network device when the UE moves from the first communication system to the second communication system, or the step of receiving the second information sent by the second core network device; the determining unit is used to determine the QoS flow status information used by the UE in the second communication system, and / or other processes for the technology described in this article; further, the first core network device 700 also includes: a deleting unit 703, which is used to delete the QoS flow corresponding to the EPS bearer of the PDN connection that is not in the QoS flow status information. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0353] In hardware implementation, the above-mentioned determination unit 702 may be a processor; the receiving unit 701 may be a receiver, which may form a communication interface with the transmitter.

[0354] Figure 23 As shown, a possible logical structure diagram of the first core network device 710 involved in the above-mentioned embodiments provided in an embodiment of the present application is provided. The first core network device 710 includes: a processor 712, a communication interface 713, a memory 711 and a bus 714. The processor 712, the communication interface 713 and the memory 711 are interconnected through the bus 714. In an embodiment of the application, the processor 712 is used to control and manage the actions of the first core network device 710, for example, the processor 712 is used to execute the determination of the QoS flow status information used by the UE in the second communication system, and / or other processes for the technology described herein. The communication interface 713 is used to support the first core network device 710 to communicate. The memory 711 is used to store program code and data of the first core network device 710.

[0355] Among them, the processor 712 can be 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, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The bus 714 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 23 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0356] In the case of dividing each functional module into corresponding functional modules, Figure 24A possible structural diagram of the second core network device involved in the above embodiment is shown, and the second core network device 800 includes: an acquisition unit 801 and a sending unit 802. Among them, the acquisition unit 501 is used to execute the step of acquiring the first QoS flow information, and / or other processes described in this document; the sending unit 802 is used to execute the step of sending the first QoS flow information to the UE, and / or other processes described in this document. Furthermore, the second core network device 800 also includes: a determination unit 803, which is used to execute the step of determining the third information based on the first EPS bearer status information and the PDN connection context, and / or other processes described in this document. All relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module, and will not be repeated here.

[0357] In hardware implementation, the above-mentioned determination unit 803 may be a processor; the acquisition unit 801 may be a receiver; and the sending unit 802 may be a transmitter, which may form a communication interface with the receiver.

[0358] Figure 25 As shown, a possible logical structure diagram of the second core network device 810 involved in the above-mentioned embodiments provided in an embodiment of the present application is provided. The second core network device 810 includes: a processor 812, a communication interface 813, a memory 811 and a bus 814. The processor 812, the communication interface 813 and the memory 811 are interconnected via the bus 814. In an embodiment of the application, the processor 812 is used to control and manage the actions of the second core network device 810, for example, the processor 812 is used to execute the step of determining the third information based on the first EPS bearer status information and the PDN connection context, and / or other processes for the technology described herein. The communication interface 813 is used to support the second core network device 810 to communicate. The memory 811 is used to store program code and data of the second core network device 810.

[0359] Among them, the processor 812 can be 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, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The bus 814 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 25 Only one thick line is used in the diagram, but this does not mean that there is only one bus or one type of bus.

[0360] In another embodiment of the present application, a system is further provided, which includes a user equipment UE, a first core network device and a second core network device; wherein the user equipment is the above-mentioned Figure 14 or Figure 15 The user equipment provided, or the above Figure 20 or Figure 21 The user equipment provided; and / or, the first core network device is the above Figure 16 or Figure 17 The first core network device provided, or the above Figure 22 and Figure 23 The first core network device provided; and / or, the second core network device is the above Figure 18 or Figure 19 The second core network device provided, or the above Figure 24 or Figure 25 The second core network device provided.

[0361] In another embodiment of the present application, a computer-readable storage medium is provided. The computer-readable storage medium stores computer-executable instructions. When at least one processor of a device executes the computer-executable instructions, the device executes Figure 3 、 Figure 4 or Figure 8 The provided communication system mobile method or execution Figure 9 or Figure 13 A method for mobility between communication systems is provided.

[0362] In another embodiment of the present application, a computer program product is further provided. The computer program product includes computer-executable instructions, which are stored in a computer-readable storage medium. At least one processor of the device can read the computer-executable instructions from the computer-readable storage medium, and at least one processor executes the computer-executable instructions so that the device implements Figure 3 、 Figure 4 or Figure 8 The provided communication system mobile method or implementation Figure 9 or Figure 13 A method for mobility between communication systems is provided.

[0363] In an embodiment of the present application, when the UE establishes a PDN connection, the UE instructs the first core network entity to determine the first QoS flow information in the second communication system corresponding to the first EPS bearer of the UE in the first communication system through the first information. Afterwards, the first core network entity determines and saves the first QoS flow information, and sends the first QoS flow information to the UE through the first message. When the UE moves from the first communication system to the second communication system, the UE and the first core network entity can determine the QoS flow information used by the UE in the second communication system based on the first QoS flow information, thereby achieving the mapping between the first EPS bearer and the first QoS flow information when the UE moves from the first communication system to the second communication system, and aligning the activated bearers, thereby ensuring that the UE seamlessly transfers to the second communication system.

[0364] Finally, it should be noted that the above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, applied to a user equipment, characterized in that: The method comprises: During establishment of a Protocol Data Network (PDN) connection in a first communication system, sending first information indicating that the PDN connection can be moved from the first communication system to a second communication system; receiving a first message, the first message being used to establish or modify an evolved packet system (EPS) bearer in the first communication system, the PDN connection including the EPS bearer, and the first message including first quality of service (QoS) flow information of the second communication system corresponding to the EPS bearer; Saving the first QoS flow information; moving from the first communication system to the second communication system; QoS flow information used by the user equipment in the second communication system is determined according to the first QoS flow information.

2. The method according to claim 1, characterized in that The first QoS flow information includes one or more of the following items: a session aggregation maximum bit rate AMBR or a QoS rule.

3. The method according to claim 1 or 2, characterized in that The EPS bearer is a default bearer.

4. The method according to claim 1 or 2, characterized in that The storing of the first QoS flow information includes: The correspondence between the EPS bearer context and the first QoS flow information is saved.

5. The method according to claim 3, characterized in that The storing of the first QoS flow information includes: The correspondence between the EPS bearer context and the first QoS flow information is saved.

6. The method according to claim 1 or 2, characterized in that The storing of the first QoS flow information includes: The first QoS flow information is included in the context of the EPS bearer.

7. The method according to any one of claim 3, characterized in that The storing of the first QoS flow information includes: The first QoS flow information is included in the context of the EPS bearer.

8. The method according to claim 1 or 2 or 5 or 7, characterized in that The first QoS flow information also includes: a PDU session identifier.

9. The method according to claim 1 or 2 or 5 or 7, characterized in that The first QoS flow information is included in a protocol configuration option PCO.

10. The method according to claim 3, characterized in that The first QoS flow information is included in a protocol configuration option PCO.

11. The method according to claim 4, characterized in that The first QoS flow information is included in a protocol configuration option PCO.

12. The method according to claim 6, characterized in that The first QoS flow information is included in a protocol configuration option PCO.

13. The method according to any one of claims 1, 2, 5, 7, or 10 to 12, characterized in that The first information is contained in a protocol configuration option PCO.

14. The method according to claim 3, characterized in that The first information is contained in a protocol configuration option PCO.

15. The method according to claim 4, characterized in that The first information is contained in a protocol configuration option PCO.

16. The method according to claim 6, characterized in that The first information is contained in a protocol configuration option PCO.

17. The method according to claim 9, characterized in that It is characterized by: The first information is contained in a protocol configuration option PCO.

18. The method according to any one of claims 10 to 12 or any one of claims 14 to 17, characterized in that The PCO is a common PCO or an extended PCO.

19. The method according to claim 9, characterized in that The PCO is a common PCO or an extended PCO.

20. The method according to claim 13, wherein The PCO is a common PCO or an extended PCO.

21. The method according to any one of claims 1, 2, 5, 7, 10 to 12, 14 to 17, 19, or 20, wherein: After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

22. The method according to claim 3, characterized in that After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

23. The method according to claim 4, characterized in that After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

24. The method according to claim 6, characterized in that After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

25. The method according to claim 8, wherein After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

26. The method according to claim 9, characterized in that After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

27. The method according to claim 13, wherein After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

28. The method according to claim 18, wherein After determining the QoS flow information used by the user equipment in the second communication system according to the first QoS flow information, the method further includes: A context of a second EPS bearer is deleted, where the second EPS bearer is an EPS bearer corresponding to no QoS flow information in the user equipment.

29. The method of any one of claims 1, 2, 5, 7, 10 to 12, 14 to 17, 19, 20, or 22 to 28, wherein: The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

30. The method according to claim 3, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

31. The method according to claim 4, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

32. The method according to claim 6, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

33. The method according to claim 8, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

34. The method according to claim 9, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

35. The method according to claim 13, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

36. The method according to claim 18, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

37. The method according to claim 21, wherein The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

38. The method according to claim 2, wherein The QoS rule includes one or more of the following information: a QoS rule identifier, a QoS flow identifier, a priority, or a packet filter.

39. The method of any one of claims 1, 2, 5, 7, 10 to 12, 14 to 17, 19, 20, 22 to 28, or 30 to 38, wherein: Moving from the first communication system to the second communication system comprises: receiving a switching instruction, the switching instruction including a QoS flow identifier and a PDU session identifier; In response to the switching instruction, an operation of switching from the first communication system to the second communication system is performed.

40. The method of any one of claims 1, 2, 5, 7, 10 to 12, 14 to 17, 19, 20, 22 to 28, or 30 to 38, wherein: The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

41. The method according to claim 3, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

42. The method according to claim 4, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

43. The method according to claim 6, characterized in that The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

44. The method according to claim 8, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

45. The method according to claim 9, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

46. ​​The method according to claim 13, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

47. The method according to claim 18, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

48. The method according to claim 21, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

49. The method according to claim 29, wherein The receiving the first message includes: The first message is received from a first core network entity, where the first core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

50. A communication method, applied to a core network entity, characterized in that: The method comprises: receiving first information during establishment of a protocol data network (PDN) connection of a user equipment within a first communication system; determining, based on the first information, that the PDN connection can be moved from the first communication system to a second communication system, and sending a first message, where the first message is used to establish or modify an Evolved Packet System (EPS) bearer in the first communication system, the PDN connection including the EPS bearer, and the first message including first quality of service (QoS) flow information of the second communication system corresponding to the EPS bearer; When the user equipment moves from the first communication system to the second communication system, or after the user equipment moves from the first communication system to the second communication system, the QoS flow information used by the user equipment in the second communication system is determined based on the first QoS flow information.

51. The method according to claim 50, wherein The first QoS flow information includes one or more of the following items: a session aggregation maximum bit rate AMBR or a QoS rule.

52. The method according to claim 50 or 51, characterized in that The EPS bearer is a default bearer.

53. The method according to claim 50 or 51, characterized in that The method further comprises: The first QoS flow information is saved.

54. The method according to claim 53, wherein The storing of the first QoS flow information includes: The correspondence between the EPS bearer context and the first QoS flow information is saved.

55. The method according to claim 50, 51 or 54, characterized in that The first QoS flow information also includes: a PDU session identifier.

56. The method according to claim 50, 51 or 54, characterized in that The first QoS flow information is included in a protocol configuration option PCO.

57. The method according to claim 50, 51 or 54, characterized in that The first information is contained in a protocol configuration option PCO.

58. The method according to claim 56, characterized in that The PCO is a common PCO or an extended PCO.

59. The method according to claim 50, 51 or 54, characterized in that The first communication system is a fourth-generation 4G communication system, and the second communication system is a fifth-generation 5G communication system.

60. The method according to any one of claims 50, 51 or 54, wherein: The core network entity is a session management function entity + control plane PDN gateway SMF + PGW-C.

61. The method according to claim 51, wherein The QoS rule includes one or more of the following information: a QoS rule identifier, a QoS flow identifier, a priority, or a packet filter.

62. A user equipment, characterized in that The device comprises a processor, wherein the processor operates to enable the user equipment to execute the communication method according to any one of claims 1 to 49.

63. A core network entity, characterized in that: It includes a processor, which runs to enable the core network entity to execute the communication method described in any one of claims 50 to 61.

64. A computer-readable storage medium, wherein the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are executed by a user device, the user device executes the communication method described in any one of claims 1 to 49.

65. A computer-readable storage medium, wherein computer execution instructions are stored in the computer-readable storage medium. When the computer execution instructions are executed by a core network entity, the core network entity executes the communication method described in any one of claims 50 to 61.

66. A computer program product, when running on a computer, causes the computer to execute the communication method according to any one of claims 1 to 61.

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