CN113923682B

CN113923682B - Communication method, device and system

Info

Publication number: CN113923682B
Application number: CN202010645155.6A
Authority: CN
Inventors: 李永翠; 辛阳; 倪慧
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-07-07
Filing date: 2020-07-07
Publication date: 2024-04-09
Anticipated expiration: 2040-07-07
Also published as: CN113923682A

Abstract

The application provides a communication method, a communication device and a communication system. The method comprises the following steps: the home domain policy control network element sends policy information to the home domain session management network element, wherein the policy information comprises at least one identifier of a service data flow and at least one first QoS parameter corresponding to the service data flow; the home domain policy control network element receives feedback information from the home domain session management network element; the home domain policy control network element determines not to send the QoS parameter which is higher than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the feedback information. Based on the scheme, the home domain policy control network element can determine not to send QoS requests to the VPLMN according to the received feedback information, thereby being beneficial to avoiding signaling waste caused by the fact that the HPLMN frequently sends the QoS requests to the VPLMN and saving signaling overhead.

Description

Communication method, device and system

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a communications method, apparatus, and system.

Background

Currently, in a home domain routing roaming scenario, during session establishment, a visited domain session management function (visited session management function, V-SMF) network element decides to reject a session of a home domain PLMN (home PLMN, HPLMN) or an establishment request of a partial quality of service (Quality of Service, qoS) flow of the session according to a policy of a visited domain public land mobile network (visited public land mobile network, VPLMN). In the session modification process, the V-SMF network element decides to reject the modification request of the session of the HPLMN or the partial QoS flow of the session according to the strategy of the VPLMN.

However, since the HPLMN or application function (Application Function, AF) network element does not perceive the policy of the VPLMN, the HPLMN or AF network element may frequently initiate QoS setup or modification requests, but the V-SMF may always reject the QoS setup or modification requests, thereby causing additional signaling overhead.

Disclosure of Invention

The application provides a communication method, a communication device and a communication system, which are used for reducing signaling overhead.

In a first aspect, an embodiment of the present application provides a communication method, including: the method comprises the steps that a home domain policy control network element sends policy information to a home domain session management network element, wherein the policy information comprises an identifier of at least one service data flow and a first quality of service (QoS) parameter corresponding to the at least one service data flow; the home domain policy control network element receives feedback information from the home domain session management network element; and the home domain policy control network element determines not to send the QoS parameters which have higher requirements than the QoS parameters rejected by the VPLMN of the visited domain public land mobile network and/or the QoS parameters rejected by the VPLMN in the first QoS parameters to the home domain session management network element according to the feedback information.

In this embodiment, the QoS parameter that is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter may also be referred to as a third QoS parameter.

Based on the above scheme, in the home domain roaming scenario, the home domain policy control network element can determine not to send the QoS request to the VPLMN according to the received feedback information, thereby helping to avoid signaling waste caused by frequent sending of the QoS request to the VPLMN by the HPLMN, and saving signaling overhead.

In a possible implementation method, the feedback information includes an identifier of a rejected service data flow in the at least one service data flow, where the rejected service data flow is a service data flow corresponding to a QoS parameter rejected by the VPLMN in the first QoS parameter; the home domain policy control network element determining, according to the feedback information, not to send to the home domain session management network element a QoS parameter having a higher requirement than a QoS parameter rejected by a VPLMN and/or a QoS parameter rejected by the VPLMN in the first QoS parameter, including: and the home domain policy control network element determines not to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identifier of the rejected service data flow.

Based on the scheme, the home domain policy control network element can determine that the QoS parameter which has higher requirements than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter is not sent to the home domain session management network element according to the service data flow corresponding to the QoS parameter rejected by the VPLMN.

In a possible implementation method, the feedback information includes an identifier of an allowed service data flow in the at least one service data flow, where the allowed service data flow is a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter; the home domain policy control network element determining, according to the feedback information, not to send to the home domain session management network element a QoS parameter having a higher requirement than a QoS parameter rejected by a VPLMN and/or a QoS parameter rejected by the VPLMN in the first QoS parameter, including: and the home domain policy control network element determines not to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identifier of the allowed service data flow.

Based on the scheme, the home domain policy control network element can determine that the QoS parameter which has higher requirements than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter is not sent to the home domain session management network element according to the service data flow corresponding to the QoS parameter allowed by the VPLMN.

In one possible implementation method, the feedback information includes indication information, where the indication information is used to indicate that the VPLMN cannot meet some or all of the first QoS parameters; the home domain policy control network element determining, according to the feedback information, not to send to the home domain session management network element a QoS parameter having a higher requirement than a QoS parameter rejected by a VPLMN and/or a QoS parameter rejected by the VPLMN in the first QoS parameter, including: and the home domain policy control network element determines not to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the indication information.

Based on the scheme, the home domain policy control network element may determine, according to the indication information, not to send to the home domain session management network element QoS parameters that are higher than the QoS parameters rejected by the VPLMN and/or QoS parameters rejected by the VPLMN among the first QoS parameters.

In a possible implementation method, the feedback information further includes QoS parameters rejected by the VPLMN in the first QoS parameters and/or QoS parameters allowed by the VPLMN in the first QoS parameters.

In a possible implementation method, the feedback information further includes an identification of a rejected service data flow in the at least one service data flow and/or an identification of an allowed service data flow in the at least one service data flow; the rejected service data flow is a service data flow corresponding to a QoS parameter rejected by the VPLMN in the first QoS parameter, and the allowed service data flow is a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter.

In a possible implementation method, the determining, by the home domain policy control network element according to the feedback information, not to send to the home domain session management network element QoS parameters that are higher than QoS parameters rejected by a VPLMN and/or QoS parameters rejected by the VPLMN in the first QoS parameters includes: and the home domain policy control network element determines that the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter is not sent to the home domain session management network element before the VPLMN is changed according to the feedback information.

Based on this scheme, the home domain policy control network element may determine that the QoS parameters that are higher than the QoS parameters rejected by the VPLMN and/or the QoS parameters rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element before the VPLMN changes, thereby avoiding signaling wastage.

In one possible implementation method, the home domain policy control network element receives notification information from the home domain session management network element, where the notification information is used to notify that a VPLMN has changed; and the home domain policy control network element determines to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the notification information.

In one possible implementation method, the home domain policy control network element sends a subscription request to the home domain session management network element, the subscription request being for subscribing to PLMN change events.

In one possible implementation, the first QoS parameter includes one or more of the following information: 5G service quality marks 5QI, distributes and preempts priority ARP, up-line bandwidth, down-line bandwidth, time delay, packet loss rate and error rate.

In a second aspect, an embodiment of the present application provides a communication method, including: the home domain session management network element receives a first quality of service QoS parameter corresponding to the service data flow from the home domain policy control network element; the home domain session management network element sends a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network (VPLMN), wherein the first QoS rule comprises a first identifier of at least one first QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, and the second QoS parameter is obtained according to the first QoS parameter; the home domain session management network element receives first feedback information from the visit domain session management network element; the home domain session management network element determines that part or all of the second QoS parameters are refused according to the first feedback information; the home domain session management network element monitors whether the VPLMN is changed; after the home domain session management network element monitors that the VPLMN is changed, sending notification information to a home domain policy control network element, wherein the notification information is used for notifying the VPLMN of the change, the notification information triggers the home domain policy control network element to send a third QoS parameter to the home domain session management network element, and the third QoS parameter comprises a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter with higher requirement than the QoS parameter rejected by the first VPLMN.

In one possible implementation method, the home domain session management network element receives the third QoS parameter from the home domain policy control network element; the home domain session management network element sends a second QoS rule to a visited domain session management network element belonging to a second VPLMN, where the second QoS rule includes a second identifier of at least one second QoS flow and a fourth QoS parameter corresponding to the at least one second QoS flow, where the fourth QoS parameter is obtained according to the third QoS parameter.

In a possible implementation method, the first feedback information includes an identifier of a rejected QoS flow in the at least one first QoS flow, where the rejected QoS flow is a QoS flow corresponding to a QoS parameter rejected by the first VPLMN in the second QoS parameters; the home domain session management network element determining that part or all of the second QoS parameters are rejected according to the first feedback information, including: and the home domain session management network element determines that part or all of the second QoS parameters are refused according to the identifier of the refused QoS flow.

In a possible implementation method, the first feedback information includes an identifier of an allowed QoS flow in the at least one first QoS flow, where the allowed QoS flow is a QoS flow corresponding to a QoS parameter allowed by the first VPLMN in the second QoS parameter; the home domain session management network element determining that part or all of the second QoS parameters are rejected according to the first feedback information, including: and the home domain session management network element determines that part or all of the second QoS parameters are refused according to the identifier of the allowed QoS flow.

In one possible implementation method, the first feedback information includes first indication information, where the first indication information is used to indicate that the first VPLMN cannot meet some or all of the second QoS parameters; the home domain session management network element determining that part or all of the second QoS parameters are rejected according to the first feedback information, including: and the home domain session management network element determines that part or all of the second QoS parameters are refused according to the first indication information.

In one possible implementation method, the first feedback information further includes QoS parameters rejected by the first VPLMN from among the second QoS parameters; and/or QoS parameters of the second QoS parameters that are allowed by the first VPLMN.

In one possible implementation method, the first feedback information further includes an identification of a rejected QoS flow in the at least one first QoS flow and/or an identification of an allowed QoS flow in the at least one first QoS flow; the rejected QoS flows are QoS flows corresponding to QoS parameters rejected by the first VPLMN in the second QoS parameters, and the allowed QoS flows are QoS flows corresponding to QoS parameters allowed by the first VPLMN in the second QoS parameters.

In one possible implementation method, the home domain session management network element sends second feedback information to the home domain policy control network element according to the first feedback information, where the second feedback information includes at least one of an identifier of a rejected service data flow, an identifier of an allowed service data flow, and second indication information, where the rejected service data flow corresponds to a rejected QoS parameter in the second QoS parameters, and the allowed service data flow corresponds to an allowed QoS parameter in the second QoS parameters, and the second indication information is used to indicate that the first VPLMN cannot meet some or all QoS parameters in the first QoS parameters.

In one possible implementation method, the first QoS parameter and the second QoS parameter include one or more of the following information: 5G service quality marks 5QI, distributes and preempts priority ARP, up-line bandwidth, down-line bandwidth, time delay, packet loss rate and error rate.

In a third aspect, an embodiment of the present application provides a communication method, including: the visiting domain session management network element receives a quality of service (QoS) rule from a home domain session management network element, wherein the QoS rule comprises an identifier of at least one QoS flow and a QoS parameter corresponding to the at least one QoS flow; the visit domain session management network element determines that part or all of the QoS parameters can not be met according to the strategy of the visit domain public land mobile network (VPLMN); the visiting domain session management network element sends indication information to the home domain session management network element, wherein the indication information is used for indicating that the VPLMN cannot meet part or all of QoS parameters contained in the QoS rule.

In a possible implementation method, the visited domain session management network element sends an identifier of a rejected QoS flow in the at least one QoS flow to the home domain session management network element, where the rejected QoS flow is a QoS flow corresponding to a QoS parameter rejected by the VPLMN from QoS parameters included in the QoS rule; and/or the visiting domain session management network element sends the identifier of the allowed QoS flow in the at least one QoS flow to the home domain session management network element, where the allowed QoS flow is a QoS flow corresponding to a QoS parameter allowed by the VPLMN in QoS parameters included in the QoS rule.

In a possible implementation method, the visited domain session management network element sends QoS parameters rejected by the VPLMN from QoS parameters included in the QoS rule to the home domain session management network element; and/or the visiting domain session management network element sends the QoS parameters allowed by the VPLMN in the QoS parameters contained in the QoS rule to the home domain session management network element.

In one possible implementation method, the QoS rule includes QoS parameters including one or more of the following information: 5G service quality marks 5QI, distributes and preempts priority ARP, up-line bandwidth, down-line bandwidth, time delay, packet loss rate and error rate.

In a fourth aspect, embodiments of the present application provide a communication method, including: the data analysis network element receives the VPLMN information of the public land mobile network of the visiting domain from the session management network element or at least one terminal device, wherein the VPLMN information comprises the measurement parameters of the VPLMN; the data analysis network element determines a data analysis result of the VPLMN according to the VPLMN information, wherein the data analysis result comprises one or more of the following information: the identifier of the VPLMN, the service identifier, the service experience, the session identifier, the identifier of the at least one terminal device and the maximum supported QoS parameter; the data analysis network element sends the data analysis result to a home domain core network element, the data analysis result is used for the home domain core network element to judge whether to send a service establishment request to the VPLMN, and the home domain core network element is a home domain policy control network element or a home domain session management network element.

Based on the scheme, under the home domain roaming scene, the home domain core network element can receive the data analysis result of the VPLMN from the data analysis network element, and further judge whether to send the service establishment request to the VPLMN according to the data analysis result of the VPLMN, so that the signaling overhead waste caused by frequent sending of the service establishment request to the VPLMN by the home domain core network element is avoided, and the signaling overhead can be saved.

In a possible implementation method, the data analysis network element receives an analysis subscription request from the home domain core network element, where the analysis subscription request includes an identifier of the VPLMN, and the analysis subscription request is used to subscribe to a data analysis result of the VPLMN; the data analysis network element sends the data analysis result to a home domain core network element, and the data analysis result comprises: and the data analysis network element sends analysis subscription notification to the home domain core network element, wherein the analysis subscription notification contains the data analysis result.

In one possible implementation, the measurement parameters include one or more of the following information: the data transmission rate of the VPLMN, the delay of the VPLMN, qoS parameters of QoS flows already established on the at least one terminal device.

In one possible implementation method, the at least one terminal device includes at least one local breakout LBO terminal device and at least one home domain roaming HR terminal device, and the VPLMN information includes LBO network information and HR network information; the data analysis network element determines a data analysis result of the VPLMN according to the VPLMN information, and the data analysis network element comprises: and the data analysis network element determines the HR network information according to the VPLMN information and determines the data analysis result according to the HR network information.

In a possible implementation method, the LBO network information further includes information of the LBO terminal device, and the HR network information further includes information of the HR terminal device; the data analysis network element receives information of a first terminal device from a session management network element, wherein the first terminal device is HR terminal device; the data analysis network element identifies the HR terminal device according to the information of the first terminal device and the information of the HR terminal device in the at least one terminal device.

In one possible implementation method, the information of the LBO terminal device includes an identifier of the LBO terminal device and a session identifier of the LBO terminal device, the information of the HR terminal device includes an identifier of the HR terminal device and a session identifier of the HR terminal device, and the information of the first terminal device includes an identifier of the first terminal device and a session identifier of the first terminal device.

In one possible implementation method, the data analysis network element in any implementation method may be a data analysis network element of a home domain or a data analysis network element of a visited domain.

In a fifth aspect, embodiments of the present application provide a communication method, including: the home domain core network element receives a data analysis result of the first visited domain public land mobile network VPLMN from the home domain data analysis network element, the data analysis result comprising one or more of the following information: the identification of the first VPLMN, the service identification, the first service experience, the session identification, the identification of at least one terminal equipment and the maximum supported QoS parameters; and the home domain core network element judges whether to send a service establishment request to the first VPLMN according to the data analysis result.

Based on the above scheme, in the home domain roaming scenario, the home domain core network element can receive the data analysis result of the VPLMN from the home domain data analysis network element, and further judge whether to send the service establishment request to the VPLMN according to the data analysis result of the VPLMN, thereby helping to avoid the signaling overhead waste caused by frequent sending of the service establishment request to the VPLMN by the home domain core network element, and thus can save the signaling overhead.

In one possible implementation, the service establishment request includes a first QoS parameter or a second service experience; the home domain core network element judges whether to send a service establishment request to the first VPLMN according to the data analysis result, and comprises the following steps: and the home domain core network element determines to send the service establishment request to the first VPLMN according to the data analysis result and the first VPLMN supports the first QoS parameter or the second service experience.

In one possible implementation, the service establishment request includes a first QoS parameter or a second service experience; the home domain core network element judges whether to send a service establishment request to the first VPLMN according to the data analysis result, and comprises the following steps: the home domain core network element determines that the first VPLMN does not support the first QoS parameter or the second service experience according to the data analysis result, and determines not to send the service establishment request to the first VPLMN; the home domain core network element sends a subscription request to a home domain session management network element, wherein the subscription request is used for subscribing PLMN change events; the home domain core network element receives notification information from the home domain session management network element, wherein the notification information is used for notifying a VPLMN to change; and the home domain core network element determines to send the service establishment request to the second VPLMN according to the notification information.

In one possible implementation method, the home domain core network element is a home domain policy control network element or a home domain session management network element.

In a sixth aspect, an embodiment of the present application provides a communications device, where the communications device may be a home domain policy control network element, and may also be a chip for the home domain policy control network element. The apparatus has a function of realizing each implementation method of the first aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a seventh aspect, embodiments of the present application provide a communications device, which may be a home domain session management network element, or may be a chip for a home domain session management network element. The apparatus has a function of realizing each implementation method of the second aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In an eighth aspect, an embodiment of the present application provides a communication device, where the device may be a visited domain session management network element, and may also be a chip for the visited domain session management network element. The apparatus has a function of realizing each of the realizing methods of the third aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a ninth aspect, embodiments of the present application provide a communications device, which may be a home domain data analysis network element, or may be a chip for a home domain data analysis network element. The apparatus has a function of realizing each implementation method of the fourth aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a tenth aspect, an embodiment of the present application provides a communication device, where the device may be a home domain core network element (such as a home domain session management network element or a home domain policy control network element), or may be a chip for a home domain core network element. The apparatus has a function of realizing each implementation method of the fifth aspect. The functions can be realized by hardware, and can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In an eleventh aspect, embodiments of the present application provide a communication device comprising a processor and a memory; the memory is configured to store computer-executable instructions that, when executed by the apparatus, cause the apparatus to perform any implementation of the first to fifth aspects described above.

In a twelfth aspect, embodiments of the present application provide a communication device comprising means for performing the steps of any implementation method of the first to fifth aspects described above.

In a thirteenth aspect, embodiments of the present application provide a communication device, including a processor and an interface circuit, where the processor is configured to communicate with other devices through the interface circuit, and perform any implementation method of the first aspect to the fifth aspect. The processor includes one or more.

In a fourteenth aspect, an embodiment of the present application provides a communications device, including a processor, configured to be connected to a memory, and configured to invoke a program stored in the memory, to perform any implementation method of the first aspect to the fifth aspect. The memory may be located within the device or may be located external to the device. And the processor includes one or more.

In a fifteenth aspect, embodiments of the present application further provide a computer-readable storage medium having instructions stored therein that, when executed on a computer, cause a processor to perform any implementation method of the first to fifth aspects described above.

In a sixteenth aspect, embodiments of the present application also provide a computer program product comprising a computer program which, when run, causes any implementation of the above-mentioned first to fifth aspects to be performed.

In a seventeenth aspect, embodiments of the present application further provide a chip system, including: a processor configured to perform any implementation method of the first to fifth aspects.

In an eighteenth aspect, embodiments of the present application further provide a communication system, including: the home domain policy controls network elements and home domain session management network elements. The home domain policy control network element is configured to send policy information to the home domain session management network element, where the policy information includes an identifier of at least one service data flow and a first quality of service QoS parameter corresponding to the at least one service data flow; receiving second feedback information from the home domain session management network element; and according to the second feedback information, determining that the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN in the visited domain public land mobile network is not sent to the home domain session management network element and/or the QoS parameter rejected by the VPLMN in the first QoS parameter. The home domain session management network element is configured to receive the policy information from the home domain policy control network element; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first quality of service QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; determining the second feedback information according to the first feedback information; and sending the second feedback information to the home domain policy control network element.

In a nineteenth aspect, embodiments of the present application further provide a communication system, including: the home domain policy controls network elements and home domain session management network elements. The home domain policy control network element is configured to send a first quality of service QoS parameter corresponding to a service data flow to the home domain session management network element. The home domain session management network element is configured to receive the first QoS parameter from the home domain policy control network element; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; determining that part or all of the second QoS parameters are refused according to the first feedback information; monitoring whether the VPLMN has changed; after the change of the VPLMN is monitored, sending notification information to the home domain policy control network element, wherein the notification information is used for notifying the change of the VPLMN, the notification information triggers the home domain policy control network element to send a third QoS parameter to the home domain session management network element, and the third QoS parameter comprises a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter with higher requirement than the QoS parameter rejected by the first VPLMN.

In a twentieth aspect, embodiments of the present application further provide a communication system, including: home domain data analysis network elements and home domain core network elements. The home domain data analysis network element is configured to receive visited domain public land mobile network VPLMN information from a session management network element or at least one terminal device, where the VPLMN information includes measurement parameters of a first VPLMN; determining a data analysis result of the first VPLMN according to the VPLMN information, wherein the data analysis result comprises one or more of the following information: the identifier of the first VPLMN, the service identifier, the first service experience, the session identifier, the identifier of the at least one terminal device, and the maximum supported quality of service QoS parameter; and sending the data analysis result to the home domain core network element. The home domain core network element is configured to receive the data analysis result from the home domain data analysis network element; and judging whether to send a service establishment request to the first VPLMN according to the data analysis result, wherein the home domain core network element is a home domain policy control network element or a home domain session management network element.

Drawings

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

Fig. 2 is a schematic diagram of another communication system according to an embodiment of the present application;

FIG. 3 is a schematic diagram of a roaming scenario for a 5G home route;

fig. 4 is a schematic flow chart of a communication method according to an embodiment of the present application;

fig. 5 is a schematic flow chart of another communication method according to an embodiment of the present application;

fig. 6 is a schematic flow chart of another communication method according to an embodiment of the present application;

fig. 7 is a schematic diagram of a communication device according to an embodiment of the present application;

fig. 8 is a schematic diagram of another communication device according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings. The specific method of operation in the method embodiment may also be applied to the device embodiment or the system embodiment. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.

To solve the problems mentioned in the background art, as shown in fig. 1, the present application provides a communication system, which includes a home domain policy control network element and a home domain session management network element. Optionally, the system further comprises a visited domain session management network element.

In a first embodiment:

the home domain policy control network element is configured to send policy information to the home domain session management network element, where the policy information includes an identifier of at least one service data flow and a first quality of service QoS parameter corresponding to the at least one service data flow; receiving second feedback information from the home domain session management network element; and according to the second feedback information, determining that the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN in the visited domain public land mobile network is not sent to the home domain session management network element and/or the QoS parameter rejected by the VPLMN in the first QoS parameter. The home domain session management network element is configured to receive the policy information from the home domain policy control network element; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first quality of service QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; determining the second feedback information according to the first feedback information; and sending the second feedback information to the home domain policy control network element.

In a possible implementation method, the second feedback information includes an identifier of a rejected service data flow in the at least one service data flow, where the rejected service data flow is a service data flow corresponding to a QoS parameter rejected by the VPLMN in the first QoS parameters; the home domain policy control network element is configured to determine, according to the second feedback information, that QoS parameters that are higher than QoS parameters that are rejected by a VPLMN and/or QoS parameters that are rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element, where the determining includes: and determining not to send the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identification of the rejected service data flow.

In a possible implementation method, the second feedback information includes an identifier of an allowed service data flow in the at least one service data flow, where the allowed service data flow is a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter; the home domain policy control network element is configured to determine, according to the second feedback information, that QoS parameters that are higher than QoS parameters that are rejected by a VPLMN and/or QoS parameters that are rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element, where the determining includes: and determining not to send the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identification of the allowed service data flow.

In one possible implementation method, the second feedback information includes second indication information, where the second indication information is used to indicate that the VPLMN cannot meet some or all of the first QoS parameters; the home domain policy control network element is configured to determine, according to the second feedback information, that QoS parameters that are higher than QoS parameters that are rejected by a VPLMN and/or QoS parameters that are rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element, where the determining includes: and determining not to send the QoS parameter which is higher than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the second indication information.

In a possible implementation method, the second feedback information further includes QoS parameters rejected by the VPLMN in the first QoS parameters and/or QoS parameters allowed by the VPLMN in the first QoS parameters.

In a possible implementation method, the second feedback information further includes an identification of a rejected service data flow in the at least one service data flow and/or an identification of an allowed service data flow in the at least one service data flow; the rejected service data flow is a service data flow corresponding to a QoS parameter rejected by the VPLMN in the first QoS parameter, and the allowed service data flow is a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter.

In a possible implementation method, the home domain policy control network element is configured to determine, according to the second feedback information, not to send, to the home domain session management network element, a QoS parameter that is higher than a QoS parameter that is rejected by a VPLMN and/or a QoS parameter that is rejected by the VPLMN in the first QoS parameter, where the determining includes: and determining that the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter is not sent to the home domain session management network element before the VPLMN is changed according to the second feedback information.

In one possible implementation method, the home domain policy control network element is further configured to receive notification information from the home domain session management network element, where the notification information is used to notify a VPLMN of a change; and according to the notification information, determining to send the QoS parameters which are higher than the QoS parameters rejected by the VPLMN and/or the QoS parameters rejected by the VPLMN in the first QoS parameters to the home domain session management network element.

In one possible implementation method, the home domain policy control element is further configured to send a subscription request to the home domain session management element, where the subscription request is used to subscribe to PLMN change events.

In one possible implementation method, the first QoS parameter, the second QoS parameter, and the third QoS parameter respectively include one or more of the following information: 5G service quality marks 5QI, distributes and preempts priority ARP, up-line bandwidth, down-line bandwidth, time delay, packet loss rate and error rate.

In one possible implementation, the first feedback information includes one or more of the following information:

an identification of a rejected QoS flow in the at least one first QoS flow, the rejected QoS flow being a QoS flow corresponding to a QoS parameter rejected by the VPLMN in the second QoS parameter;

an identification of an allowed QoS flow in the at least one first QoS flow, where the allowed QoS flow is a QoS flow corresponding to a QoS parameter allowed by the VPLMN in the second QoS parameter;

and the first indication information is used for indicating that the VPLMN cannot meet part or all of the second QoS parameters.

In one possible implementation method, the visited domain session management network element is configured to receive the first QoS rule from the home domain session management network element; determining that part or all of the second QoS parameters cannot be met according to a policy of a VPLMN; and sending the first feedback information to the home domain session management network element.

In a second embodiment:

the home domain policy control network element is configured to send a first quality of service QoS parameter corresponding to a service data flow to the home domain session management network element. The home domain session management network element is configured to receive the first QoS parameter from the home domain policy control network element; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; determining that part or all of the second QoS parameters are refused according to the first feedback information; monitoring whether the VPLMN has changed; after the change of the VPLMN is monitored, sending notification information to the home domain policy control network element, wherein the notification information is used for notifying the change of the VPLMN, the notification information triggers the home domain policy control network element to send a third QoS parameter to the home domain session management network element, and the third QoS parameter comprises a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter with higher requirement than the QoS parameter rejected by the first VPLMN.

In one possible implementation method, the home domain session management network element is further configured to receive the third QoS parameter from the home domain policy control network element; and sending a second QoS rule to a visiting domain session management network element belonging to a second VPLMN, wherein the second QoS rule comprises a second identifier of at least one second QoS flow and a fourth QoS parameter corresponding to the at least one second QoS flow, and the fourth QoS parameter is obtained according to the third QoS parameter.

In a possible implementation method, the first feedback information includes an identifier of a rejected QoS flow in the at least one first QoS flow, where the rejected QoS flow is a QoS flow corresponding to a QoS parameter rejected by the first VPLMN in the second QoS parameters; the home domain session management network element is configured to determine, according to the first feedback information, that part or all of the second QoS parameters are rejected, and specifically includes: for determining that some or all of the second QoS parameters are rejected based on the identification of the rejected QoS flow.

In a possible implementation method, the first feedback information includes an identifier of an allowed QoS flow in the at least one first QoS flow, where the allowed QoS flow is a QoS flow corresponding to a QoS parameter allowed by the first VPLMN in the second QoS parameter; the home domain session management network element is configured to determine, according to the first feedback information, that part or all of the second QoS parameters are rejected, and specifically includes: for determining that some or all of the second QoS parameters are rejected based on the identification of the allowed QoS flows.

In one possible implementation method, the first feedback information includes first indication information, where the first indication information is used to indicate that the first VPLMN cannot meet some or all of the second QoS parameters; the home domain session management network element is configured to determine, according to the first feedback information, that part or all of the second QoS parameters are rejected, and specifically includes: and determining that part or all of the second QoS parameters are rejected according to the first indication information.

In one possible implementation method, the home domain session management network element is further configured to send second feedback information to the home domain policy control network element according to the first feedback information, where the second feedback information includes at least one of an identifier of a rejected service data flow, an identifier of an allowed service data flow, and second indication information, where the rejected service data flow corresponds to a rejected QoS parameter in the second QoS parameters, and the allowed service data flow corresponds to an allowed QoS parameter in the second QoS parameters, and the second indication information is used to indicate that the first VPLMN cannot meet some or all QoS parameters in the first QoS parameters.

In each implementation method of the first embodiment and the second embodiment, when some or all QoS parameters in the QoS parameters sent by the home domain policy control network element cannot be satisfied by the visited domain VPLMN, it is determined that the third QoS parameter is not sent. As another implementation scheme, the above various implementation methods may be extended to the home domain session management network element sending QoS parameters to the visited domain session management network element, where if it is determined that some or all of the sent QoS parameters cannot be satisfied by the visited domain VPLMN, the home domain session management network element determines not to send the third QoS parameter. That is, the judging body for judging whether to send the third QoS parameter is extended from the home domain policy control network element to the home domain session management network element. Accordingly, the home domain session management network element may also subscribe itself or subscribe other network elements to PLMN change events, and after determining that the VPLMN changes, the home domain session management network element sends a third QoS parameter to the new VPLMN.

The specific implementation of the above solution will be described in detail in the following method embodiment section, and will not be described herein.

The system shown in fig. 1 may be used in the fifth generation (5th generation,5G) network architecture shown in fig. 3, and of course, may also be used in future network architectures, such as the sixth generation (6th generation,6G) network architecture, etc., which is not limited in this application.

To solve the problems mentioned in the background art, as shown in fig. 2, the present application provides another communication system, which includes a home domain data analysis network element and a home domain core network element.

In one embodiment:

the data analysis network element is configured to receive, from a session management network element or at least one terminal device, VPLMN information of a public land mobile network of a visited domain, where the VPLMN information includes measurement parameters of a first VPLMN; determining a data analysis result of the first VPLMN according to the VPLMN information, wherein the data analysis result comprises one or more of the following information: the identifier of the first VPLMN, the service identifier, the first service experience, the session identifier, the identifier of the at least one terminal device, and the maximum supported quality of service QoS parameter; and sending the data analysis result to the home domain core network element. The home domain core network element is configured to receive the data analysis result from the data analysis network element; and judging whether to send a service establishment request to the first VPLMN according to the data analysis result, wherein the home domain core network element is a home domain policy control network element or a home domain session management network element.

In a possible implementation method, the data analysis network element is further configured to receive an analysis subscription request from the home domain core network element, where the analysis subscription request includes an identifier of the first VPLMN, and the analysis subscription request is used to subscribe to a data analysis result of the first VPLMN; the data analysis network element is configured to send the data analysis result to a home domain core network element, and specifically includes: and the analysis subscription notification is used for sending the analysis subscription notification to the home domain core network element, and the analysis subscription notification contains the data analysis result.

In one possible implementation, the measurement parameters include one or more of the following information: the data transmission rate of the first VPLMN, the delay of the first VPLMN, qoS parameters of QoS flows already established on the at least one terminal device.

In one possible implementation method, the at least one terminal device includes at least one local breakout LBO terminal device and at least one home domain roaming HR terminal device, and the VPLMN information includes LBO network information and HR network information; the data analysis network element is configured to determine, according to the VPLMN information, a data analysis result of the first VPLMN, and specifically includes: and the data analysis result is determined according to the HR network information determined from the VPLMN information.

In a possible implementation method, the LBO network information further includes information of the LBO terminal device, and the HR network information further includes information of the HR terminal device; the data analysis network element is further configured to receive information of a first terminal device from the session management network element, where the first terminal device is HR terminal device; and identifying the HR terminal equipment according to the information of the first terminal equipment and the information of the HR terminal equipment in the at least one terminal equipment.

In one possible implementation, the service establishment request includes a first QoS parameter or a second service experience; the home domain core network element is configured to determine, according to the data analysis result, whether to send a service establishment request to the first VPLMN, and specifically includes: and the method is used for determining that the first VPLMN supports the first QoS parameter or the second service experience according to the data analysis result, and sending the service establishment request to the first VPLMN.

In one possible implementation, the service establishment request includes a first QoS parameter or a second service experience; the home domain core network element is configured to determine, according to the data analysis result, whether to send a service establishment request to the first VPLMN, and specifically includes: the method comprises the steps of determining that the first VPLMN does not support the first QoS parameter or the second service experience according to the data analysis result, and determining not to send the service establishment request to the first VPLMN; the home domain core network element is further configured to send a subscription request to a home domain session management network element, where the subscription request is used to subscribe to a PLMN change event; receiving notification information from the home domain session management network element, the notification information being used to notify a VPLMN of a change; and according to the notification information, determining to send the service establishment request to the second VPLMN.

In one possible implementation method, the data analysis network element may be a data analysis network element of a home domain or a data analysis network element of a visited domain.

The system shown in fig. 2 may be used in the 5G network architecture shown in fig. 3, and of course, may also be used in future network architectures, such as a 6G network architecture, etc., which is not limited in this application.

For example, assume that the communication system shown in fig. 1 is applied to a 5G network architecture, and is shown in fig. 3 as a Roaming (Roaming) scenario diagram of a 5G Home-Route (HR). The network element or entity corresponding to the home domain session management network element in fig. 1 may be an H-SMF network element in the 5G network architecture shown in fig. 3, the network element or entity corresponding to the home domain policy control network element in fig. 1 may be an H-PCF network element in the 5G network architecture shown in fig. 3, and the network element or entity corresponding to the visited domain session management network element in fig. 1 may be a V-SMF network element in the 5G network architecture shown in fig. 3.

For example, assume that the communication system shown in fig. 2 is applied to a 5G network architecture, and is shown in fig. 3 as a roaming scenario diagram of 5G HR. The network element or entity corresponding to the data analysis network element in fig. 2 may be an H-NWDAF network element in the 5G network architecture shown in fig. 3, and the network element or entity corresponding to the home domain core network element in fig. 2 may be an H-PCF network element or an H-SMF network element in the 5G network architecture shown in fig. 3.

The 5G network architecture shown in fig. 3 may include three parts, namely a terminal device part, a Data Network (DN), and an operator network part. The following provides a brief description of the functionality of some of the network elements.

Wherein the operator network may include, but is not limited to, one or more of the following network elements: an AF network element, a network opening function (network exposure function, NEF) network element (not shown in the figure), a policy control function (Policy Control Function, PCF) network element, an access and mobility management function (Access and Mobility Management Function, AMF) network element, an SMF network element, a radio access network (radioaccess network, RAN) device, and a user plane function (user plane function, UPF) network element, a network data analysis function (Network Data Analytics Function, NWDAF) network element, etc. In the above-described operator network, the portion other than the radio access network portion may be referred to as a core network portion.

In a specific implementation, the terminal device in the embodiment of the present application may be a device for implementing a wireless communication function. The terminal device may be a User Equipment (UE), an access terminal, a terminal unit, a terminal station, a mobile station, a remote terminal, a mobile device, a wireless communication device, a terminal agent, a terminal apparatus, or the like in a 5G network or a PLMN of future evolution. An access terminal may be a cellular telephone, cordless telephone, session initiation protocol (session initiation protocol, SIP) phone, wireless local loop (wireless local loop, WLL) station, personal digital assistant (personal digital assistant, PDA), handheld device with wireless communication capability, computing device or other processing device connected to a wireless modem, vehicle-mounted device or wearable device, virtual Reality (VR) terminal device, augmented reality (augmented reality, AR) terminal device, wireless terminal in industrial control (industrial control), wireless terminal in self-driving (self-driving), wireless terminal in telemedicine (remote medium), wireless terminal in smart grid (smart grid), wireless terminal in transportation security (transportation safety), wireless terminal in smart city (smart city), wireless terminal in smart home (smart home), etc. The terminal may be mobile or stationary.

The terminal device may establish a connection with the operator network through an interface (e.g., N1, etc.) provided by the operator network, and use data and/or voice services provided by the operator network. The terminal device may also access the DN through an operator network, use operator services deployed on the DN, and/or services provided by a third party. The third party may be a service party outside the operator network and the terminal device, and may provide other services such as data and/or voice for the terminal device. The specific expression form of the third party may be specifically determined according to the actual application scenario, which is not limited herein.

The RAN is a sub-network of the operator network, and is an implementation system between a service node and a terminal device in the operator network. The terminal equipment is to access the operator network, firstly through the RAN, and then can be connected with the service node of the operator network through the RAN. The RAN device in the present application is a device that provides a wireless communication function for a terminal device, and the RAN device is also referred to as an access network device. RAN devices in this application include, but are not limited to: a next generation base station (G nodeB, gNB), evolved node B (eNB), radio network controller (radio network controller, RNC), node B (NB), base station controller (base station controller, BSC), base transceiver station (base transceiver station, BTS), home base station (e.g., home evolved nodeB, or home node B, HNB), baseBand unit (BBU), transmission point (transmitting and receiving point, TRP), transmission point (transmitting point, TP), mobile switching center, and the like in 5G.

The AMF network element mainly performs the functions of mobility management, access authentication/authorization and the like. In addition, it is also responsible for passing user policies between the UE and PCF.

The SMF network element mainly performs the functions of session management, PCF issuing control strategy execution, UPF selection, UE internet protocol (internet protocol, IP) address allocation and the like.

The UPF network element is used as interface UPF of data network to complete the functions of user plane data forwarding, charging statistics based on session/stream level, bandwidth limitation, etc.

The NEF network element is mainly used for supporting the opening of the capability and the event.

AF network element, mainly transmits the requirement of application side to network side, such as QoS requirement or user state event subscription. The AF may be a third party functional entity or may be an application service deployed by an operator. The AF network element may also be an application server, a third party device, or the like.

PCF network element is mainly responsible for charging, qoS bandwidth guarantee, mobility management, UE policy decision and other policy control functions aiming at session and service flow level.

An NWDAF Network element is configured to provide Network analysis information to a Network Function (NF) Network element, such as an AMF Network element, an SMF Network element, a PCF Network element, and the like. The NWDAF network element may notify the NF that has subscribed with the network analysis information, or the NF network element may directly obtain specific network analysis information from the NWDAF network element.

The DN is a network outside the operator network, the operator network can be accessed to a plurality of DNs, a plurality of services can be deployed on the DNs, and services such as data and/or voice can be provided for the terminal equipment. For example, the DN is a private network of an intelligent plant, the sensors installed in the plant of the intelligent plant may be terminal devices, a control server of the sensors is disposed in the DN, and the control server may serve the sensors. The sensor may communicate with the control server, obtain instructions from the control server, transmit collected sensor data to the control server, etc., according to the instructions. For another example, DN is an internal office network of a company, where a mobile phone or a computer of an employee of the company may be a terminal device, and the mobile phone or the computer of the employee may access information, data resources, etc. on the internal office network of the company.

It should be noted that the corresponding PLMNs are different for different operators. PLMNs are used to distinguish mobile communication operators of different countries or regions. A service area may consist of one or several public land mobile networks. The PLMN is operated by a government or its approved operators, a network established and operated for the purpose of providing land mobile services to the public. One PLMN is represented by a mobile device country code and a mobile device network code (Mobile Network Code, MNC). Wherein, MNC of China mobile is 00, MNC of China Unicom is 01.

The embodiment of the application is suitable for a Home Routing (HR) roaming scene. Home domain roaming refers to that a PDU session of a terminal device is served by an SMF network element (i.e. H-SMF network element) of a home domain PLMN (home PLMN, HPLMN), a UPF (i.e. H-UPF) of the HPLMN, and an SMF (i.e. V-SMF) of a visited domain PLMN (VPLMN), a UPF (i.e. V-UPF) of the VPLMN. Wherein, HPLMN refers to PLMN to which the terminal equipment belongs or signs up, VPLMN refers to PLMN visited by the terminal equipment.

It will be appreciated that the network elements or functions described above may be either network elements in a hardware device, software functions running on dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). Alternatively, the network element or the function may be implemented by one device, or may be implemented by a plurality of devices together, or may be a functional module in one device, which is not specifically limited in this embodiment of the present application.

The application function network element, session management network element, policy control network element, and data analysis network element in the present application may be an AF, an SMF (such as H-SMF or V-SMF), a PCF (such as H-PCF or V-PCF), and an NWDAF (such as H-NWDAF) in fig. 3, or may be a network element with the above AF, SMF, PCF, NWDAF function in future communication such as a 6G network, which is not limited in the present application. For convenience of explanation, the application function network element, the session management network element, the policy control network element, and the data analysis network element are respectively described as AF, SMF, PCF, NWDAF.

To solve the problems mentioned in the background art, the present application provides a communication method based on the network architecture shown in fig. 3, as shown in fig. 4.

Wherein the following H-SMF and H-PCF are assigned to the HPLMN and the following V-SMF is assigned to the first VPLMN.

The method comprises the following steps:

in step 401, the AF sends a request message to the H-PCF. Accordingly, the H-PCF may receive the request message.

The request message contains QoS requirements including, but not limited to, one or more of the following: uplink bandwidth, downlink bandwidth, time delay, packet loss rate and bit error rate.

Optionally, the AF sends the request message to the H-PCF via NEF.

This step 401 is an optional step.

The h-PCF generates policy information, step 402.

The H-PCF generates policy information according to the received QoS requirement. Wherein the policy information comprises an identification of at least one traffic data flow (Service data flow, SDF) and a first QoS parameter corresponding to the at least one traffic data flow, the first QoS parameter including, but not limited to, one or more of the following information: 5G QoS identification (5G QoS Identifier,5QI), allocation and preemption priority (Allocation and Retention Priority, ARP), upstream bandwidth, downstream bandwidth, latency, packet loss rate, bit error rate.

For example, the policy information contains ((SDF ID1, qoS parameter 1), (SDF ID2, qoS parameter 2), (SDF ID3, qoS parameter 3)).

In step 403, the H-PCF sends policy information to the H-SMF. The corresponding H-SMF may receive the policy information.

As an implementation method, the H-PCF may send policy information to the H-SMF in the session establishment procedure, where the policy information is carried in the npcf_smplicycontrol_create response.

As an implementation method, the H-PCF may send policy information to the H-SMF in the PCF initiated session modification procedure, carried in the npcf_smpolicy control_ UpdateNotify request.

In step 404, the H-SMF generates a first QoS rule according to the policy information.

The first QoS rule includes a first identification of at least one first QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being derived from the first QoS parameter. The second QoS parameter includes, but is not limited to, one or more of the following information: 5QI, ARP, upstream bandwidth, downstream bandwidth, time delay, packet loss rate and bit error rate.

Wherein the identity of the QoS flow may be represented by a QoS flow identity (QoS flow identity, QFI).

For example, the H-SMF merges the service data flows corresponding to the same or similar QoS parameters in the received policy information, and uses the same QoS flows to perform service guarantee. As an example, the policy information received by the H-SMF includes ((SDF ID1, qoS parameter 1), (SDF ID2, qoS parameter 2), (SDF ID3, qoS parameter 3)), and the H-SMF determines that QoS parameter 1 and QoS parameter 2 are the same or similar, and then the service data flow identified by SDF ID1 and the service data flow identified by SDF ID2 may be service-secured using the same QoS flow, and the resulting first QoS rule includes ((QFI 1, qoS parameter 4), (QFI 2, qoS parameter 5)), where QoS parameter 4 is obtained according to QoS parameter 1 and QoS parameter 2, and QoS parameter 5 is the same or similar as QoS parameter 3.

In step 405, the H-SMF sends a first QoS rule to the V-SMF. Accordingly, the V-SMF may receive the first QoS rule.

As an implementation method, the H-SMF may send the first QoS rule to the V-SMF in the session establishment procedure, where the first QoS rule is carried in nsmf_pduse_create response.

As an implementation method, the H-SMF may send the first QoS rule carried in the nsmf_pduse_update request to the V-SMF in the session modification procedure initiated by the PCF.

In step 406, the v-SMF determines that some or all of the second QoS parameters cannot be met according to the policy of the first VPLMN.

For example, the V-SMF determines that a portion of the latency requirements in the second QoS parameter cannot be met, or that a portion of the bandwidth requirements cannot be met, etc.

In step 407, the v-SMF sends the first feedback information to the H-SMF. Accordingly, the H-SMF may receive the first feedback information.

Wherein the first feedback information may include one or more of the following information:

1) And the identifier of the rejected QoS flow in the at least one first QoS flow, wherein the rejected QoS flow is a QoS flow corresponding to the QoS parameter rejected by the first VPLMN in the second QoS parameter.

In the embodiment of the present application, the identifier of the rejected QoS flow may also be understood as the identifier of the released QoS flow.

2) And the identification of the allowed QoS flows in the at least one first QoS flow, wherein the allowed QoS flows are QoS flows corresponding to the QoS parameters allowed by the first VPLMN in the second QoS parameters.

3) And the first indication information is used for indicating that the first VPLMN cannot meet part or all of the second QoS parameters.

Optionally, when the first feedback information includes the first indication information but does not include the identifier of the rejected QoS flow and the identifier of the allowed QoS flow, the first feedback information may further include a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter allowed by the first VPLMN in the second QoS parameter.

The following is described in connection with an example.

For example, the first QoS rule received by the V-SMF includes: ((QFI 1, qoS parameter 4), (QFI 2, qoS parameter 5)) V-SMF determines that QoS parameter 4 cannot be satisfied (e.g., bandwidth, delay, etc. cannot be satisfied therein) but QoS parameter 5 can be satisfied according to the policy of the first VPLMN, and then sends first feedback information to the H-SMF, which can be, for example, but not limited to, any of the following:

1) The identity of the rejected QoS flow, QFI-1.

2) The identity of the allowed QoS flows, QFI-2.

3) First indication information, and rejected QoS parameters (i.e., qoS parameter 4).

4) First indication information and allowed QoS parameters (i.e. QoS parameters 5).

5) An identification of a rejected QoS flow (i.e., QFI-1), and an identification of an allowed QoS flow (i.e., QFI-2).

6) First indication information and an identification of the rejected QoS flow (i.e. QFI-1).

7) First indication information and an identification of allowed QoS flows (i.e. QFI-2).

As an implementation method, the V-SMF may send the first feedback information to the H-SMF in an nsmf_pduse_update Request or nsmf_pduse_update Response.

In step 408, the H-SMF sends second feedback information to the H-PCF. Accordingly, the H-PCF may receive the second feedback information.

Wherein the second feedback information is generated by the H-SMF according to the first feedback information.

Wherein the second feedback information comprises one or more of the following information:

1) And the identification of the rejected service data flow in the at least one service data flow, wherein the rejected service data flow is the service data flow corresponding to the QoS parameter rejected by the first VPLMN in the first QoS parameter.

The "at least one service data flow" herein refers to at least one service data flow corresponding to the policy information of step 402.

2) And the identification of the allowed service data flow in the at least one service data flow, wherein the allowed service data flow is the service data flow corresponding to the QoS parameter allowed by the first VPLMN in the first QoS parameter.

3) And second indication information for indicating that the first VPLMN cannot meet part or all of the second QoS parameters.

Optionally, when the second feedback information includes the second indication information but does not include the identifier of the rejected service data flow and the identifier of the allowed service data flow, the second feedback information may further include a QoS parameter rejected by the first VPLMN in the first QoS parameter and/or a QoS parameter allowed by the first VPLMN in the first QoS parameter.

The following is described in connection with an example.

For example, the first feedback information is any one of 1) to 7 described in the above example, and the second feedback information may be, but is not limited to, any one of the following:

1) Identification of rejected traffic streams, SDF ID1 and SDF ID2.

2) The identity of the allowed service data flow, SDF ID3.

3) The second indication information, the rejected QoS parameters (i.e., qoS parameter 1 and QoS parameter 2) in the first QoS parameters.

4) Second indication information, a QoS parameter allowed in the first QoS parameter (i.e., qoS parameter 3).

5) The identity of the rejected traffic streams (i.e., SDF ID1 and SDF ID 2), and the identity of the allowed traffic streams (i.e., SDF ID 3).

6) Second indication information, identification of the rejected traffic data flows (i.e., SDF ID1 and SDF ID 2).

7) Second indication information, an identification of allowed traffic data flows (i.e., SDF ID 3).

As an implementation method, the H-SMF may send the second feedback information to the H-PCF with the second feedback information carried in the npcf_smpolicy control_update request.

Step 409, the H-PCF determines that the third QoS parameter is not to be sent to the H-SMF until the VPLMN is changed.

Note that the H-PCF not transmitting the third QoS parameters to the H-SMF means that the H-PCF does not transmit the third QoS parameters to the H-SMF for the traffic data flow that is rejected (or released).

As an implementation method, after the H-PCF receives the second feedback information, it determines that some or all of the first QoS parameters are rejected, and then determines that a third QoS parameter is not sent to the H-SMF before the VPLMN is changed, where the third QoS parameter includes a QoS parameter that is higher than the QoS parameter requirement rejected by the first VPLMN and/or a QoS parameter that is rejected by the first VPLMN among the first QoS parameters. This is because if the VPLMN is unchanged, the H-PCF will reject the fourth QoS parameter if it sends the third QoS parameter to the H-SMF, which then gets the fourth QoS parameter from the third QoS parameter and sends the fourth QoS parameter to the V-SMF. Thus, to avoid unnecessary signaling overhead, the H-PCF determines not to send the third QoS parameter to the H-SMF before the VPLMN changes.

As another implementation method, after the H-PCF receives the second feedback information, it determines that some or all of the first QoS parameters are rejected, and then determines not to send the third QoS parameters to the H-SMF. That is, the H-PCF decides not to send the third QoS parameter to the H-SMF regardless of whether the VPLMN has changed. Based on this implementation, the following steps 410 to 413 and other steps need not be performed. I.e. after step 409 the flow ends.

Wherein the method for determining that the third QoS parameter is not to be sent to the H-SMF (or determining that the third QoS parameter is not to be sent to the H-SMF before the VPLMN is changed) by the H-PCF based on the second feedback information includes, but is not limited to:

in method 1, if the second feedback information includes an identifier of a rejected service data flow in the at least one service data flow, the H-PCF determines not to send the third QoS parameter to the H-SMF (or determines not to send the third QoS parameter to the H-SMF before the VPLMN is changed) according to the identifier of the rejected service data flow.

In method 2, if the second feedback information includes an identifier of an allowed service data flow in the at least one service data flow, the H-PCF determines not to send the third QoS parameter to the H-SMF (or determines not to send the third QoS parameter to the H-SMF before the VPLMN is changed) according to the identifier of the allowed service data flow.

For example, the H-PCF determines that the second feedback information has a smaller identification of allowed traffic data flows than the H-PCF sends to the H-SMF, and determines that some traffic data flows are rejected, and thus determines not to send the third QoS parameters to the H-SMF (or determines not to send the third QoS parameters to the H-SMF before the VPLMN changes).

In method 3, if the second feedback information includes the second indication information and includes the rejected QoS parameter in the first QoS parameter and/or the allowed QoS parameter in the first QoS parameter, the H-PCF determines not to send the third QoS parameter to the H-SMF (or determines not to send the third QoS parameter to the H-SMF before the VPLMN is changed) according to the second indication information and the rejected QoS parameter in the first QoS parameter and/or the allowed QoS parameter in the first QoS parameter.

The H-PCF sends a subscription request to the H-SMF, step 410. Accordingly, the H-SMF may receive the subscription request.

The subscription request is for subscribing to PLMN change events. That is, when a PLMN change occurs, the H-SMF needs to report a PLMN change event to the H-PCF based on the subscription of the H-PCF.

As one implementation, the H-PCF sends policy control request trigger to the H-SMF via the npcf_smpolicy control_update response, which policy control request trigger is PLMN change.

In step 411, the H-SMF monitors for VPLMN changes.

The H-SMF starts to monitor whether a PLMN change occurs according to the subscription request of the H-PCF in step 410.

In step 412, the H-SMF sends notification information to the H-PCF. The corresponding H-PCF may receive the notification information.

When the H-SMF monitors that the PLMN change event occurs, notification information is sent to the H-PCF for notifying the VPLMN of the change. Alternatively, the notification information may carry an identifier of the changed PLMN (referred to as an identifier of the second VPLMN in this embodiment of the present application).

In step 413, the H-PCF determines to send a third QoS parameter.

Since the VPLMN is changed, qoS parameters not allowed by the PLMN before the change (i.e., the first VPLMN) may be allowed in the changed PLMN (i.e., the second VPLMN), and thus the H-PCF may retransmit the third QoS parameters to the changed PLMN through the H-SMF.

For example, after step 413, the H-PCF sends a third QoS parameter to the H-SMF, and then the H-SMF sends a second QoS rule to the V-SMF (the V-SMF is referred to as V-SMF1 in the embodiment of the present application) belonging to the second VPLMN, where the second QoS rule includes a second identifier of at least one second QoS flow and a fourth QoS parameter corresponding to at least one second QoS flow, and the fourth QoS parameter is obtained according to the third QoS parameter. Then V-SMF1 determines whether to allow the fourth QoS parameter according to the policy of the second VPLMN. The subsequent processes are similar to the implementation methods of the steps 406 to 413 in the embodiment of the present application, and will not be repeated.

Based on the above scheme, in the home domain roaming scenario, the HPLMN may determine, according to the received feedback information, not to send the QoS request to the VPLMN, so as to help avoid signaling waste caused by frequent sending of the QoS request to the VPLMN by the HPLMN, and may save signaling overhead.

As an alternative implementation, the above steps 408 to 413 may be replaced by the following steps 408 'to 413'.

Step 408', H-SMF sends second feedback information to AF. Accordingly, the AF may receive the second feedback information.

Step 409', the AF determines that QoS requirements are not to be sent to the H-PCF until the VPLMN is changed.

The QoS requirements here comprise rejected QoS parameters in the first QoS parameters or QoS parameters that are higher required than the rejected QoS parameters.

Specifically, the AF may determine, based on the second feedback information, that QoS requirements are not to be sent to the H-PCF until the VPLMN is changed.

In step 410', the AF sends a subscription request to the H-SMF. Accordingly, the H-SMF may receive the subscription request.

The subscription request is for subscribing to PLMN change events. That is, when the VPLMN changes, the H-SMF needs to report the PLMN change event to the AF based on the subscription of the AF.

Step 411', H-SMF monitors for VPLMN changes.

The H-SMF starts to monitor whether a PLMN change occurs according to the subscription request of the H-PCF in step 410'.

Step 412', H-SMF sends notification information to the AF. Accordingly, the AF may receive the notification information.

When the H-SMF monitors that the PLMN change event occurs, notification information is sent to the AF for notifying that the VPLMN is changed. Alternatively, the notification information may carry the identifier of the changed PLMN.

In step 413', the AF determines to resend the QoS requirements to the H-PCF.

Since the VPLMN changes, qoS parameters not allowed by the PLMN before the change may be allowed in the PLMN after the change, and thus the AF may re-send QoS requirements to the H-PCF, thereby triggering the H-PCF to re-initiate the QoS request.

As another alternative implementation, the above steps 408 to 413 may be replaced by the following steps 408 "to 416".

Step 408", the H-SMF sends second feedback information to the H-PCF. Accordingly, the H-PCF may receive the second feedback information.

Step 409", the H-PCF sends second feedback information to the AF. Accordingly, the AF may receive the second feedback information.

Step 410", the AF determines that QoS requirements are not to be sent to the H-PCF until the VPLMN is changed.

Step 411", the AF sends a subscription request to the H-PCF. Accordingly, the H-PCF may receive the subscription request.

The subscription request is for subscribing to PLMN change events. That is, when the VPLMN changes, the H-PCF needs to report PLMN change events to the AF based on the subscription of the AF.

Step 412", the H-PCF sends a subscription request to the H-SMF. Accordingly, the H-SMF may receive the subscription request.

The subscription request is for subscribing to PLMN change events. That is, when the VPLMN changes, the H-SMF needs to report PLMN change events to the H-PCF based on the subscription of the H-PCF.

Step 413", H-SMF monitors for VPLMN changes.

The H-SMF starts monitoring whether a PLMN change has occurred based on the subscription request of the H-PCF in step 412 ".

Step 414", the H-SMF sends notification information to the H-PCF. Accordingly, the H-PCF may receive the notification information.

When the H-SMF monitors that the PLMN change event occurs, notification information is sent to the H-PCF for notifying the VPLMN of the change. Alternatively, the notification information may carry the identifier of the changed PLMN.

Step 415", the H-PCF sends notification information to the AF. Accordingly, the AF may receive the notification information.

When the H-PCF receives the notification information from the H-SMF, the notification information is sent to the AF for notifying that the VPLMN has changed. Alternatively, the notification information may carry the identifier of the changed PLMN.

Step 416", the AF determines to send QoS requirements to the H-PCF.

To solve the problems mentioned in the background art, the present application provides another communication method based on the network architecture shown in fig. 3, as shown in fig. 5. The main differences between the method and the embodiment corresponding to fig. 4 are: in the embodiment corresponding to fig. 4, the H-PCF actively subscribes to the H-SMF for PLMN change events, while in the embodiment corresponding to fig. 5, the H-SMF does not receive the subscription of the H-PCF, but actively reports the VPLMN change to the H-PCF after detecting the VPLMN change.

The method comprises the following steps:

steps 501 to 509 are the same as steps 401 to 409 of the embodiment of fig. 4.

In step 510, the H-SMF monitors for VPLMN changes.

The H-SMF may determine, according to the first feedback information received in step 507, that part or all of the second QoS parameters are rejected, start to monitor whether the PLMN is changed, and after the VPLMN is changed, actively send notification information to the H-PCF, where the notification information is used to notify the VPLMN that the VPLMN is changed, and the notification information triggers the H-PCF to send a third QoS parameter to the H-SMF, where the third QoS parameter includes a QoS parameter rejected by the first VPLMN from the second QoS parameters, and/or a QoS parameter that is higher than a QoS parameter rejected by the first VPLMN.

Steps 511 to 512 are the same as steps 412 to 413 of the embodiment of fig. 4.

In the above embodiment corresponding to fig. 4, an execution operation of the AF may be introduced, and the AF may not send QoS requirements to the H-PCF before determining the VPLMN change, so as to avoid unnecessary signaling overhead, and in particular, reference may be made to the above description of steps 408 'to 413', and steps 408 "to 416". In the corresponding embodiment of fig. 5, an execution operation of the AF may also be introduced, where the AF does not send QoS requirements to the H-PCF before determining the VPLMN change, so as to avoid unnecessary signaling overhead, but the main difference from the above steps 408 'to 413', or steps 408 "to 416" is that: instead of the AF or H-PCF subscribing to PLMN change events from the H-SMF, the H-SMF monitors the VPLMN change and actively reports the change to the AF or H-PCF.

To solve the problems mentioned in the background art, the present application provides another communication method based on the network architecture shown in fig. 3, as shown in fig. 6. The method is that the NWDAF determines the data analysis result of the VPLMN based on the roaming network information (also called VPLMN information) reported by the terminal equipment or session management network element, and then sends the data analysis result to the home domain core network element (which can be H-SMF or H-PCF), and the home domain core network element decides whether to initiate a service establishment request to the VPLMN according to the data analysis result, so as to avoid the extra signaling overhead caused by unnecessary service establishment request. The NWDAF may be NWDAF of the home domain (i.e., H-NWDAF) or NWDAF of the visited domain (i.e., V-NWDAF).

The following embodiments take NWDAF as H-NWDAF and home domain core network element as H-PCF as an example, and the implementation method is similar to that of home domain core network element as H-SMF, and will not be repeated.

The method comprises the following steps:

in step 601, a terminal device (may be one or more) in the first VPLMN sends a session establishment request to the V-SMF, carrying information of the terminal device (such as an identity (UE ID) of the terminal device and a session identity). Accordingly, the V-SMF may receive the session establishment request.

The terminal device herein is not limited to a specific terminal device, and may be any terminal device.

The session establishment request may be PDU session establishment request, for example.

In step 602, the v-SMF sends a create context request to the H-SMF, carrying information of the terminal device. Accordingly, the H-SMF may receive the create context request.

In step 603, the H-SMF sends an event notification to the H-NWDAF, carrying information of the terminal device. Accordingly, the H-NWDAF may receive the event notification.

For example, the H-SMF may send nsmf_eventExposure_notify to the H-NWDAF, carrying the identity of the terminal device and the PDU session identity.

Step 604, h-NWDAF saves information of the terminal device.

In this step, the H-NWDAF may save the information of the terminal device in VPLMN. Specifically, the VPLMN herein refers to a Home-Routed Roaming (HR) Roaming network. That is, the information of the terminal device stored in the H-NWDAF is information of the terminal device in the HR roaming network.

Steps 601 to 604 are optional steps.

In step 605, the terminal device obtains VPLMN information.

The VPLMN information comprises measurement parameters and optionally also an identity of the terminal device and a PDU session identity. The measurement parameters include one or more of the following information: the data transmission rate of the first VPLMN measured dynamically, the time delay of the first VPLMN measured dynamically (e.g. air interface time delay, time delay from the terminal device to the AF, etc.), qoS parameters of the QoS flow already established on the terminal device (e.g. maximum bandwidth, ARP, 5QI, time delay, etc.).

Step 606, the terminal device sends VPLMN information to the H-NWDAF. Accordingly, the H-NWDAF may receive the VPLMN information.

It should be noted that this step may be performed by a plurality of terminal devices in the first VPLMN, that is, the H-NWDAF may receive the reported VPLMN information from the plurality of terminal devices, respectively.

In step 607, the h-NWDAF determines the data analysis result of the first VPLMN according to the VPLMN information.

For example, the H-NWDAF may determine the data analysis result of the first VPLMN according to one or more of the number of terminal devices reporting the VPLMN information, the number of PDU sessions of the terminal devices, and the measurement parameters. The data analysis results contain one or more of the following information: the identity of the first VPLMN, the service identity, the first service experience, the session identity (which may be, for example, a PDU session identity), the identity of the at least one terminal device, the maximum supported QoS parameters.

For example, the data analysis result may include QoS parameters that are maximally supported by the first VPLMN for one or more terminal devices, and/or include QoS parameters that are maximally supported by the first VPLMN for one or more services, and/or include QoS parameters that are maximally supported by the first VPLMN for one or more sessions, and/or include a service experience of the first VPLMN for one or more services, and so on.

The VPLMN information here includes both Local Break (LBO) network information reported by the LBO terminal device and HR network information reported by the HR terminal device. As an implementation method, in step 607, the H-NWDAF may determine the data analysis result of the VPLMN only according to HR network information reported by the HR terminal device. Based on the implementation method, the H-NWAF needs to identify the HR network information from the received VPLMN information. For example, the LBO network information reported by the LBO terminal device further includes information of the LBO terminal device (for example, may be an identifier of the HR terminal device and a session identifier), and the HR network information reported by the HR terminal device further includes information of the HR terminal device (for example, may be an identifier of the HR terminal device and a session identifier), so that the H-NWDAF may identify HR network information from the received VPLMN information according to the information of the terminal device in the HR roaming network stored in step 604.

As an example, step 604 above saves information of UE1, UE2, and UE3, where UE1, UE2, and UE3 are all in the HR roaming network. The VPLMN information in step 606 includes ((information of UE1, information of UE1 reported VPLMN 1), (information of UE2, information of UE2 reported VPLMN 2), (information of UE4, information of UE4 reported VPLMN 3), (information of UE5, information of UE5 reported VPLMN 4)), and the H-NWDAF identifies that VPLMN information 1 and VPLMN information 2 in the reported VPLMN information are HR network information and VPLMN information 3 and VPLMN information 4 are LBO network information according to the information of UE1, information of UE2 and information of UE3 stored in step 604.

As an example, after the H-NWDAF receives the VPLMN information in step 606, a query request may be sent to the H-SMF to identify HR network information. Specifically, the query request includes an identifier of the terminal device in the VPLMN information, and optionally, a session identifier. And the H-SMF determines the HR network information according to the context information stored in the session establishment process. The context information refers to the identification session identification of the terminal device stored in the H-SMF. If the context information stored in the H-SMF has the identifier of the terminal equipment and the identifier of the session in the query request, the terminal equipment and the session can be determined to be HR network information.

In step 608, the H-PCF sends an analyze subscription request to the H-NWDAF, carrying the identity of the first VPLMN (VPLMN ID). Accordingly, the H-NWDAF may receive the analysis subscription request.

The identity of the first VPLMN here refers to the identity of the HR roaming network.

The analyze subscription request is for subscribing to data analysis results of the first VPLMN.

For example, the analysis subscription request may be Nnwdaf_Analytics Subscription_Subscription.

And step 609, the h-NWDAF sends an analysis subscription notification to the sending device, wherein the notification carries the data analysis result of the first VPLMN. Accordingly, the H-PCF may receive the analysis subscription notification.

For example, the analysis subscription notification may be nnwdaf_analysis subscription_notification.

In step 610, the h-PCF determines, according to the data analysis result, whether to send a service establishment request to the first VPLMN.

For example, the service establishment request here contains the first QoS parameter or the second service experience.

And when the H-PCF determines that the first VPLMN supports the first QoS parameter or the second service experience according to the data analysis result, determining to send a service establishment request to the first VPLMN. And when the H-PCF determines that the first VPLMN does not support the first QoS parameter or the second service experience according to the data analysis result, determining that the service establishment request is not sent to the first VPLMN. Wherein the first QoS parameter includes one or more of the following information: 5QI, ARP, upstream bandwidth, downstream bandwidth, time delay, packet loss rate and bit error rate.

Optionally, the H-CPF may send a subscription request to the H-SMF, where the subscription request is used to subscribe to PLMN change events, and when the H-CPF receives notification information from the H-SMF, where the notification information is used to notify that the VPLMN has changed, the H-CPF determines, according to the notification information, to send a service establishment request to the second VPLMN, where the service establishment request includes the first QoS parameter or the second service experience. Since the VPLMN is changed, a service setup request not allowed by the PLMN before the change (i.e., the first VPLMN) may be allowed in the PLMN after the change (i.e., the second VPLMN), and thus the H-PCF may resend the service setup request to the PLMN after the change through the H-SMF.

Based on the scheme, under the home domain roaming scene, the HPLMN can determine the data analysis result of the VPLMN, and further judge whether to send the service establishment request to the VPLMN according to the data analysis result of the VPLMN, so that the HPLMN is beneficial to avoiding the signaling overhead waste caused by frequently sending the service establishment request to the VPLMN, and the signaling overhead can be saved.

The above description has been presented mainly from the point of interaction between the network elements. It will be appreciated that, in order to achieve the above-mentioned functions, each network element includes a corresponding hardware structure and/or software module for performing each function. Those of skill in the art will readily appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as hardware or combinations of hardware and computer software. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.

It may be understood that, in the foregoing embodiments of the methods, the steps or operations corresponding to the steps or operations implemented by the access network device may also be implemented by a component (for example, a chip or a circuit) configured in the access network device, and the steps or operations corresponding to the steps or operations implemented by the user plane network element may also be implemented by a component (for example, a chip or a circuit) configured in the user plane network element.

Referring to fig. 7, a schematic diagram of a communication device according to an embodiment of the present application is provided. The device is configured to implement the steps performed by the corresponding home domain policy control network element (i.e. H-PCF), home domain session management network element (i.e. H-SMF), visited domain session management network element (i.e. V-SMF), home domain data analysis network element (i.e. H-NWDAF), or home domain core network element (i.e. H-PCF or H-SMF) in the embodiments of fig. 4 to 6, as shown in fig. 8, and the device 700 includes a transceiver unit 710 and a processing unit 720.

In a first embodiment:

a transceiver unit 710, configured to send policy information to a home domain session management network element, where the policy information includes an identifier of at least one service data flow and a first quality of service QoS parameter corresponding to the at least one service data flow; receiving feedback information from the home domain session management network element; a processing unit 720, configured to determine, according to the feedback information, not to send to the home domain session management network element a QoS parameter that is higher than the QoS parameter requirement rejected by the VPLMN of the visited domain public land mobile network and/or a QoS parameter rejected by the VPLMN in the first QoS parameter.

In a possible implementation method, the feedback information includes an identifier of a rejected service data flow in the at least one service data flow, where the rejected service data flow is a service data flow corresponding to a QoS parameter rejected by the VPLMN in the first QoS parameter; the processing unit 720 is configured to determine, according to the feedback information, that QoS parameters that are higher than QoS parameters rejected by a VPLMN and/or QoS parameters that are rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element, and specifically includes: and determining not to send the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identification of the rejected service data flow.

In a possible implementation method, the feedback information includes an identifier of an allowed service data flow in the at least one service data flow, where the allowed service data flow is a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter; the processing unit 720 is configured to determine, according to the feedback information, that QoS parameters that are higher than QoS parameters rejected by a VPLMN and/or QoS parameters that are rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element, and specifically includes: and determining not to send the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identification of the allowed service data flow.

In one possible implementation method, the feedback information includes indication information, where the indication information is used to indicate that the VPLMN cannot meet some or all of the first QoS parameters; the processing unit 720 is configured to determine, according to the feedback information, that QoS parameters that are higher than QoS parameters rejected by a VPLMN and/or QoS parameters that are rejected by the VPLMN in the first QoS parameters are not sent to the home domain session management network element, and specifically includes: and determining not to send the QoS parameter which is higher than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the indication information.

In a possible implementation method, the processing unit 720 is configured to determine, according to the feedback information, not to send, to the home domain session management network element, a QoS parameter that is higher than a QoS parameter requirement rejected by a VPLMN and/or a QoS parameter rejected by the VPLMN in the first QoS parameter, and specifically includes: and determining that the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter is not sent to the home domain session management network element before the VPLMN is changed according to the feedback information.

In a possible implementation method, the transceiver unit 710 is further configured to receive notification information from the home domain session management network element, where the notification information is used to notify the VPLMN of the change; the processing unit 720 is further configured to determine, according to the notification information, to send the QoS parameter higher than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element.

In a possible implementation method, the transceiver unit 710 is further configured to send a subscription request to the home domain session management network element, where the subscription request is used to subscribe to PLMN change events.

In a second embodiment:

a transceiver unit 710, configured to receive, from a home domain policy control network element, a first quality of service QoS parameter corresponding to a service data flow; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first quality of service QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; and after detecting that the VPLMN is changed, sending notification information to a home domain policy control network element, where the notification information is used to notify the VPLMN of the change, where the notification information triggers the home domain policy control network element to send a third QoS parameter to a home domain session management network element, where the third QoS parameter includes a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter that is higher in requirement than the QoS parameter rejected by the first VPLMN. A processing unit 720, configured to determine, according to the first feedback information, that some or all QoS parameters in the second QoS parameters are rejected; monitoring whether a VPLMN has changed.

In a possible implementation method, the transceiver unit 710 is further configured to receive the third QoS parameter from the home domain policy control network element; and sending a second QoS rule to a visiting domain session management network element belonging to a second VPLMN, wherein the second QoS rule comprises a second identifier of at least one second QoS flow and a fourth QoS parameter corresponding to the at least one second QoS flow, and the fourth QoS parameter is obtained according to the third QoS parameter.

In a possible implementation method, the first feedback information includes an identifier of a rejected QoS flow in the at least one first QoS flow, where the rejected QoS flow is a QoS flow corresponding to a QoS parameter rejected by the first VPLMN in the second QoS parameters; the processing unit 720 is configured to determine, according to the first feedback information, that part or all of the second QoS parameters are rejected, and specifically includes: and determining that part or all of the second QoS parameters are refused according to the identification of the refused QoS flow.

In a possible implementation method, the first feedback information includes an identifier of an allowed QoS flow in the at least one first QoS flow, where the allowed QoS flow is a QoS flow corresponding to a QoS parameter allowed by the first VPLMN in the second QoS parameter; the processing unit 720 is configured to determine, according to the first feedback information, that part or all of the second QoS parameters are rejected, and specifically includes: and determining that part or all of the second QoS parameters are rejected according to the identification of the allowed QoS flows.

In one possible implementation method, the first feedback information includes first indication information, where the first indication information is used to indicate that the first VPLMN cannot meet some or all of the second QoS parameters; the processing unit 720 is configured to determine, according to the first feedback information, that part or all of the second QoS parameters are rejected, and specifically includes: and according to the first indication information, determining that part or all of the second QoS parameters are refused.

In a possible implementation method, the processing unit 720 is further configured to send second feedback information to the home domain policy control network element according to the first feedback information, where the second feedback information includes at least one of an identifier of a rejected service data flow, an identifier of an allowed service data flow, and second indication information, where the rejected service data flow corresponds to a rejected QoS parameter in the second QoS parameters, and the allowed service data flow corresponds to an allowed QoS parameter in the second QoS parameters, and the second indication information is used to indicate that the first VPLMN cannot meet some or all QoS parameters in the first QoS parameters.

In a third embodiment:

a transceiver unit 710, configured to receive a quality of service QoS rule from a home domain session management network element, where the QoS rule includes an identifier of at least one quality of service QoS flow and a QoS parameter corresponding to the at least one QoS flow; and sending indication information to the home domain session management network element, wherein the indication information is used for indicating that the VPLMN cannot meet part or all of the QoS parameters contained in the QoS rule. A processing unit 720, configured to determine that some or all QoS parameters of the QoS parameters cannot be satisfied according to a policy of the visited public land mobile network VPLMN.

In a possible implementation method, the transceiver unit 710 is further configured to send, to the home domain session management network element, an identifier of a rejected QoS flow in the at least one QoS flow, where the rejected QoS flow is a QoS flow corresponding to a QoS parameter rejected by the VPLMN from QoS parameters included in the QoS rule; and/or sending the identifier of the allowed QoS flow in the at least one QoS flow to the home domain session management network element, where the allowed QoS flow is a QoS flow corresponding to a QoS parameter allowed by the VPLMN among QoS parameters included in the QoS rule.

In a possible implementation method, the transceiver unit 710 is further configured to send, to the home domain session management network element, qoS parameters rejected by the VPLMN from QoS parameters included in the QoS rule; and/or sending the QoS parameters allowed by the VPLMN in the QoS parameters contained in the QoS rule to the home domain session management network element.

In a fourth embodiment:

a transceiver unit 710 configured to receive visited domain public land mobile network VPLMN information from a session management network element or at least one terminal device, the VPLMN information comprising measurement parameters of the VPLMN; and sending a data analysis result of the VPLMN to a home domain core network element, wherein the data analysis result is used for judging whether to send a service establishment request to the VPLMN by the home domain core network element, and the home domain core network element is a home domain policy control network element or a home domain session management network element. A processing unit 720, configured to determine a data analysis result of the VPLMN according to the VPLMN information, where the data analysis result includes one or more of the following information: the identity of the VPLMN, the service identity, the service experience, the session identity, the identity of the at least one terminal device, the maximum supported quality of service QoS parameters.

In a possible implementation method, the transceiver unit 710 is further configured to receive an analysis subscription request from the home domain core network element, where the analysis subscription request includes an identifier of the VPLMN, and the analysis subscription request is used to subscribe to a data analysis result of the VPLMN; the transceiver unit 710 is configured to send the data analysis result to a home domain core network element, and specifically includes: and the analysis subscription notification is used for sending the analysis subscription notification to the home domain core network element, and the analysis subscription notification contains the data analysis result.

In one possible implementation method, the at least one terminal device includes at least one local breakout LBO terminal device and at least one home domain roaming HR terminal device, and the VPLMN information includes LBO network information and HR network information; the processing unit 720 is configured to determine a data analysis result of the VPLMN according to the VPLMN information, and specifically includes: and the data analysis result is determined according to the HR network information determined from the VPLMN information.

In a possible implementation method, the LBO network information further includes information of the LBO terminal device, and the HR network information further includes information of the HR terminal device; the transceiver unit 710 is further configured to receive information of a first terminal device from a session management network element, where the first terminal device is HR terminal device; the processing unit 720 is further configured to identify the HR terminal device according to the information of the first terminal device and the information of the HR terminal device in the at least one terminal device.

In a fifth embodiment:

a transceiver unit 710, configured to receive, from a home domain data analysis network element, a data analysis result of the first visited domain public land mobile network VPLMN, where the data analysis result includes one or more of the following information: the identification of the first VPLMN, the service identification, the first service experience, the session identification, the identification of at least one terminal equipment and the maximum supported QoS parameters; and a processing unit 720, configured to determine whether to send a service establishment request to the first VPLMN according to the data analysis result.

In one possible implementation, the service establishment request includes a first QoS parameter or a second service experience; the processing unit 720 is configured to determine whether to send a service establishment request to the first VPLMN according to the data analysis result, and specifically includes: and the method is used for determining that the first VPLMN supports the first QoS parameter or the second service experience according to the data analysis result, and sending the service establishment request to the first VPLMN.

In one possible implementation, the service establishment request includes a first QoS parameter or a second service experience; the processing unit 720 is configured to determine whether to send a service establishment request to the first VPLMN according to the data analysis result, and specifically includes: the method comprises the steps of determining that the first VPLMN does not support the first QoS parameter or the second service experience according to the data analysis result, and determining not to send the service establishment request to the first VPLMN; the transceiver unit 710 is further configured to send a subscription request to a home domain session management network element, where the subscription request is used to subscribe to a PLMN change event; receiving notification information from the home domain session management network element, the notification information being used to notify a VPLMN of a change; the processing unit 720 is further configured to determine to send the service establishment request to the second VPLMN according to the notification information.

Optionally, the communication device 700 may further include a storage unit, where the storage unit is configured to store data or instructions (which may also be referred to as codes or programs), and the respective units may interact or be coupled with the storage unit to implement the corresponding methods or functions. For example, the processing unit 720 may read data or instructions in the storage unit, so that the communication device implements the method in the above embodiment.

It should be understood that the division of the units in the above apparatus is merely a division of a logic function, and may be fully or partially integrated into a physical entity or may be physically separated when actually implemented. And the units in the device can be all realized in the form of software calls through the processing element; or can be realized in hardware; it is also possible that part of the units are implemented in the form of software, which is called by the processing element, and part of the units are implemented in the form of hardware. For example, each unit may be a processing element that is set up separately, may be implemented as integrated in a certain chip of the apparatus, or may be stored in a memory in the form of a program, and the functions of the unit may be called and executed by a certain processing element of the apparatus. Furthermore, all or part of these units may be integrated together or may be implemented independently. The processing element described herein may in turn be a processor, which may be an integrated circuit with signal processing capabilities. In implementation, each step of the above method or each unit above may be implemented by an integrated logic circuit of hardware in a processor element or in the form of software called by a processing element.

In one example, the unit in any of the above apparatuses may be one or more integrated circuits configured to implement the above methods, for example: one or more specific integrated circuits (Application Specific Integrated Circuit, ASIC), or one or more microprocessors (digital singnal processor, DSP), or one or more field programmable gate arrays (Field Programmable Gate Array, FPGA), or a combination of at least two of these integrated circuit forms. For another example, when the units in the apparatus may be implemented in the form of a scheduler of processing elements, the processing elements may be general-purpose processors, such as a central processing unit (Central Processing Unit, CPU) or other processor that may invoke the program. For another example, the units may be integrated together and implemented in the form of a system-on-a-chip (SOC).

The above transceiver unit 710 is an interface circuit of the apparatus for transmitting and receiving signals to and from other apparatuses. For example, when the device is implemented as a chip, the transceiver unit 710 is an interface circuit of the chip for transmitting signals to or receiving signals from other chips or devices.

Referring to fig. 8, a schematic diagram of a communication device is provided for implementing the operations of the home domain policy control network element (i.e. H-PCF), the home domain session management network element (i.e. H-SMF), the visited domain session management network element (i.e. V-SMF), the home domain data analysis network element (i.e. H-NWDAF), or the home domain core network element (i.e. H-PCF or H-SMF) in the above embodiment. As shown in fig. 8, the communication apparatus includes: processor 810 and interface 830, and optionally, memory 820. Interface 830 is used to enable communication with other devices.

The method performed by the home domain policy control network element (i.e. H-PCF), the home domain session management network element (i.e. H-SMF), the visited domain session management network element (i.e. V-SMF), the home domain data analysis network element (i.e. H-NWDAF) or the home domain core network element (i.e. H-PCF or H-SMF) in the above embodiment may be implemented by the processor 810 invoking a program stored in the memory (which may be the home domain policy control network element (i.e. H-PCF), the home domain session management network element (i.e. H-SMF), the visited domain session management network element (i.e. V-SMF), the home domain data analysis network element (i.e. H-NWDAF) or the home domain core network element (i.e. H-PCF or H-SMF), or an external memory). That is, the home domain policy control network element (i.e., H-PCF), the home domain session management network element (i.e., H-SMF), the visited domain session management network element (i.e., V-SMF), the home domain data analysis network element (i.e., H-NWDAF), or the home domain core network element (i.e., H-PCF or H-SMF) may include a processor 810, where the processor 810 may execute the method executed by the home domain policy control network element (i.e., H-PCF), the home domain session management network element (i.e., H-SMF), the visited domain session management network element (i.e., V-SMF), the home domain data analysis network element (i.e., H-NWDAF), or the home domain core network element (i.e., H-PCF or H-SMF) in the above method embodiments by invoking a program in a memory. The processor here may be an integrated circuit with signal processing capabilities, such as a CPU. The home domain policy control network element (i.e., H-PCF), the home domain session management network element (i.e., H-SMF), the visited domain session management network element (i.e., V-SMF), the home domain data analysis network element (i.e., H-NWDAF), or the home domain core network element (i.e., H-PCF or H-SMF) may be implemented by one or more integrated circuits configured to implement the above methods. For example: one or more ASICs, or one or more microprocessor DSPs, or one or more FPGAs, etc., or a combination of at least two of these integrated circuit forms. Alternatively, the above implementations may be combined.

In particular, the functions/implementation of the transceiver unit 710 and the processing unit 720 in fig. 7 may be implemented by the processor 810 in the communication device 800 shown in fig. 8 invoking computer executable instructions stored in the memory 820. Alternatively, the functions/implementation procedure of the processing unit 720 in fig. 7 may be implemented by the processor 810 in the communication apparatus 800 shown in fig. 8 calling computer-executable instructions stored in the memory 820, and the functions/implementation procedure of the transceiving unit 710 in fig. 7 may be implemented by the interface 830 in the communication apparatus 800 shown in fig. 8.

Those of ordinary skill in the art will appreciate that: the first, second, third, fourth, etc. numbers referred to in this application are merely for convenience of description and are not intended to limit the scope of the embodiments of the present application, but also indicate the sequence. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. "at least one" means one or more. At least two means two or more. "at least one," "any one," or the like, refers to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one of a, b, or c (species ) may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural. "plurality" means two or more, and the like.

It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic of the processes, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.

In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted from one computer-readable storage medium to another, for example, by wired (e.g., coaxial cable, optical fiber, digital Subscriber Line (DSL)), or wireless (e.g., infrared, wireless, microwave, etc.). The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device including one or more servers, data centers, etc. that can be integrated with the available medium. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.

The various illustrative logical blocks and circuits described in the embodiments of the present application may be implemented or performed with a general purpose processor, a digital signal processor, an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the general purpose processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other similar configuration.

The steps of a method or algorithm described in the embodiments of the present application may be embodied directly in hardware, in a software element executed by a processor, or in a combination of the two. The software cells may be stored in random access Memory (Random Access Memory, RAM), flash Memory, read-Only Memory (ROM), EPROM Memory, EEPROM Memory, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In an example, a storage medium may be coupled to the processor such that the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integral to the processor. The processor and the storage medium may reside in an ASIC.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In one or more exemplary designs, the functions described herein may be implemented in hardware, software, firmware, or any combination of the three. If implemented in software, the functions may be stored on a computer-readable medium or transmitted as one or more instructions or code on the computer-readable medium. Computer readable media includes both computer storage media and communication media that facilitate transfer of computer programs from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer. For example, such computer-readable media may include, but is not limited to, RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that may be used to carry or store program code in the form of instructions or data structures and other data structures that may be read by a general or special purpose computer, or a general or special purpose processor. Further, any connection is properly termed a computer-readable medium, e.g., if the software is transmitted from a website, server, or other remote source via a coaxial cable, fiber optic computer, twisted pair, digital Subscriber Line (DSL), or wireless such as infrared, radio, and microwave, and is also included in the definition of computer-readable medium. The disks (disks) and disks include compact disks, laser disks, optical disks, digital versatile disks (English: digital Versatile Disc; DVD), floppy disk and blu-ray disk where disks usually reproduce data magnetically, while disks usually reproduce data optically with lasers. Combinations of the above may also be included within the computer-readable media.

Those of skill in the art will appreciate that in one or more of the examples described above, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, these functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A storage media may be any available media that can be accessed by a general purpose or special purpose computer.

The foregoing embodiments have been provided for the purpose of illustrating the technical solution and advantageous effects of the present application in further detail, and it should be understood that the foregoing embodiments are merely illustrative of the present application and are not intended to limit the scope of the present application, and any modifications, equivalents, improvements, etc. made on the basis of the technical solution of the present application should be included in the scope of the present application. The foregoing description of the specification may enable any person skilled in the art to make or use the content of the application, and any modifications may be made based on the disclosure as will be apparent to the person skilled in the art, and the basic principles described herein may be applied to other variations without departing from the spirit and scope of the invention of the application. Thus, the disclosure is not limited to the embodiments and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Although the present application has been described in connection with specific features and embodiments thereof, it will be apparent that various modifications and combinations can be made without departing from the spirit and scope of the application. Accordingly, the specification and drawings are merely exemplary illustrations of the present application as defined in the appended claims and are considered to cover any and all modifications, variations, combinations, or equivalents that fall within the scope of the present application. It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to include such modifications and variations as well.

Claims

1. A method of communication, comprising:

the method comprises the steps that a home domain policy control network element sends policy information to a home domain session management network element, wherein the policy information comprises an identifier of at least one service data flow and a first quality of service (QoS) parameter corresponding to the at least one service data flow;

the home domain policy control network element receives feedback information from the home domain session management network element;

and the home domain policy control network element determines not to send the QoS parameters which have higher requirements than the QoS parameters rejected by the VPLMN of the visited domain public land mobile network and/or the QoS parameters rejected by the VPLMN in the first QoS parameters to the home domain session management network element according to the feedback information.

2. The communication method of claim 1, wherein the feedback information includes an identification of a rejected traffic data flow of the at least one traffic data flow, the rejected traffic data flow being a traffic data flow corresponding to a QoS parameter rejected by the VPLMN among the first QoS parameters;

the home domain policy control network element determining, according to the feedback information, not to send to the home domain session management network element a QoS parameter having a higher requirement than a QoS parameter rejected by a VPLMN and/or a QoS parameter rejected by the VPLMN in the first QoS parameter, including:

and the home domain policy control network element determines not to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identifier of the rejected service data flow.

3. The communication method of claim 1, wherein the feedback information includes an identification of an allowed service data flow in the at least one service data flow, the allowed service data flow being a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter;

and the home domain policy control network element determines not to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the identifier of the allowed service data flow.

4. The communication method of claim 1, wherein the feedback information comprises indication information indicating that the VPLMN cannot meet some or all of the first QoS parameters;

and the home domain policy control network element determines not to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the indication information.

5. The communication method of claim 4, wherein the feedback information further comprises QoS parameters of the first QoS parameters that are rejected by the VPLMN and/or QoS parameters of the first QoS parameters that are allowed by the VPLMN.

6. The communication method according to claim 4, wherein the feedback information further comprises an identification of rejected ones of the at least one traffic data flows and/or an identification of allowed ones of the at least one traffic data flows;

the rejected service data flow is a service data flow corresponding to a QoS parameter rejected by the VPLMN in the first QoS parameter, and the allowed service data flow is a service data flow corresponding to a QoS parameter allowed by the VPLMN in the first QoS parameter.

7. A communication method according to any of claims 1-6, wherein the home domain policy control network element determining not to send QoS parameters higher than the QoS parameters rejected by the VPLMN and/or QoS parameters rejected by the VPLMN among the first QoS parameters to the home domain session management network element based on the feedback information comprises:

and the home domain policy control network element determines that the QoS parameter which is higher than the QoS parameter requirement rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter is not sent to the home domain session management network element before the VPLMN is changed according to the feedback information.

8. The communication method of claim 7, further comprising:

the home domain policy control network element receives notification information from the home domain session management network element, wherein the notification information is used for notifying a VPLMN of change;

and the home domain policy control network element determines to send the QoS parameter which has higher requirement than the QoS parameter rejected by the VPLMN and/or the QoS parameter rejected by the VPLMN in the first QoS parameter to the home domain session management network element according to the notification information.

9. The communication method as claimed in claim 8, further comprising:

the home domain policy control network element sends a subscription request to the home domain session management network element, the subscription request being for subscribing to PLMN change events.

10. A communication method according to any of claims 1-6, 8-9, wherein the first QoS parameter comprises one or more of the following information:

5G service quality marks 5QI, distributes and preempts priority ARP, up-line bandwidth, down-line bandwidth, time delay, packet loss rate and error rate.

11. A method of communication, comprising:

the home domain session management network element receives a first quality of service QoS parameter corresponding to the service data flow from the home domain policy control network element;

The home domain session management network element sends a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network (VPLMN), wherein the first QoS rule comprises a first identifier of at least one first QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, and the second QoS parameter is obtained according to the first QoS parameter;

the home domain session management network element receives first feedback information from the visit domain session management network element;

the home domain session management network element determines that part or all of the second QoS parameters are refused according to the first feedback information;

sending second feedback information to the home domain policy control network element according to the first feedback information, wherein the second feedback information comprises at least one of identification of a rejected service data flow, identification of an allowed service data flow and second indication information, the rejected service data flow corresponds to a rejected QoS parameter in the second QoS parameters, the allowed service data flow corresponds to an allowed QoS parameter in the second QoS parameters, and the second indication information is used for indicating that the first VPLMN cannot meet part or all of the QoS parameters in the first QoS parameters; the second feedback information is used for the home domain policy control network element to determine that a higher QoS parameter than the QoS parameter rejected by the first VPLMN and/or a QoS parameter rejected by the first VPLMN in the first QoS parameter is not sent to the home domain session management network element before a VPLMN change occurs;

The home domain session management network element monitors whether the VPLMN is changed;

after the home domain session management network element monitors that the VPLMN is changed, sending notification information to a home domain policy control network element, wherein the notification information is used for notifying the VPLMN of the change, the notification information triggers the home domain policy control network element to send a third QoS parameter to the home domain session management network element, and the third QoS parameter comprises a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter with higher requirement than the QoS parameter rejected by the first VPLMN.

12. The communication method as claimed in claim 11, further comprising:

the home domain session management network element receiving the third QoS parameter from the home domain policy control network element;

the home domain session management network element sends a second QoS rule to a visited domain session management network element belonging to a second VPLMN, where the second QoS rule includes a second identifier of at least one second QoS flow and a fourth QoS parameter corresponding to the at least one second QoS flow, where the fourth QoS parameter is obtained according to the third QoS parameter.

13. The communication method according to claim 11 or 12, wherein the first feedback information comprises an identification of a rejected QoS flow of the at least one first QoS flow, the rejected QoS flow being a QoS flow corresponding to a QoS parameter rejected by the first VPLMN of the second QoS parameters;

The home domain session management network element determining that part or all of the second QoS parameters are rejected according to the first feedback information, including:

and the home domain session management network element determines that part or all of the second QoS parameters are refused according to the identifier of the refused QoS flow.

14. The communication method according to claim 11 or 12, wherein the first feedback information comprises an identification of an allowed QoS flow of the at least one first QoS flow, the allowed QoS flow being a QoS flow of the second QoS parameters corresponding to a QoS parameter allowed by the first VPLMN;

and the home domain session management network element determines that part or all of the second QoS parameters are refused according to the identifier of the allowed QoS flow.

15. The communication method according to claim 11 or 12, wherein the first feedback information comprises first indication information indicating that the first VPLMN cannot meet part or all of the second QoS parameters;

and the home domain session management network element determines that part or all of the second QoS parameters are refused according to the first indication information.

16. The communication method of claim 15, wherein the first feedback information further comprises QoS parameters of the second QoS parameters that were rejected by the first VPLMN; and/or QoS parameters of the second QoS parameters that are allowed by the first VPLMN.

17. The communication method of claim 15, wherein the first feedback information further comprises an identification of a rejected QoS flow in the at least one first QoS flow and/or an identification of an allowed QoS flow in the at least one first QoS flow;

the rejected QoS flows are QoS flows corresponding to QoS parameters rejected by the first VPLMN in the second QoS parameters, and the allowed QoS flows are QoS flows corresponding to QoS parameters allowed by the first VPLMN in the second QoS parameters.

18. A method of communicating according to any of claims 11-12, 16-17, wherein the first QoS parameter, the second QoS parameter comprise one or more of the following information:

19. A home domain policy control network element, comprising: a processor and a memory; the memory is configured to store computer-executable instructions that, when executed by the home domain policy control network element, cause the home domain policy control network element to perform the communication method according to any of claims 1-10.

20. A home domain session management network element comprising: a processor and a memory; the memory is configured to store computer-executable instructions that, when executed by the home domain session management network element, cause the home domain session management network element to perform the communication method according to any of claims 11-18.

21. A computer readable storage medium comprising a computer program which, when run on a computer, causes the computer to perform the communication method of any of claims 1-18.

22. A communication system comprising a home domain policy control network element and a home domain session management network element;

the home domain policy control network element is configured to send policy information to the home domain session management network element, where the policy information includes an identifier of at least one service data flow and a first quality of service QoS parameter corresponding to the at least one service data flow; receiving second feedback information from the home domain session management network element; according to the second feedback information, determining that a QoS parameter which is higher than the QoS parameter rejected by the VPLMN in the visited domain public land mobile network is not sent to the home domain session management network element and/or the QoS parameter rejected by the VPLMN in the first QoS parameter;

the home domain session management network element is configured to receive the policy information from the home domain policy control network element; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first quality of service QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; determining the second feedback information according to the first feedback information; and sending the second feedback information to the home domain policy control network element.

23. A communication system, comprising: home domain policy control network elements and home domain session management network elements;

the home domain policy control network element is configured to send a first quality of service QoS parameter corresponding to a service data flow to the home domain session management network element;

the home domain session management network element is configured to receive the first QoS parameter from the home domain policy control network element; transmitting a first QoS rule to a visited domain session management network element belonging to a first visited domain public land mobile network VPLMN, the first QoS rule comprising a first identifier of at least one first QoS flow and a second QoS parameter corresponding to the at least one first QoS flow, the second QoS parameter being obtained according to the first QoS parameter; receiving first feedback information from the visited domain session management network element; determining that part or all of the second QoS parameters are refused according to the first feedback information; sending second feedback information to the home domain policy control network element according to the first feedback information, wherein the second feedback information comprises at least one of identification of a rejected service data flow, identification of an allowed service data flow and second indication information, the rejected service data flow corresponds to a rejected QoS parameter in the second QoS parameters, the allowed service data flow corresponds to an allowed QoS parameter in the second QoS parameters, and the second indication information is used for indicating that the first VPLMN cannot meet part or all of the QoS parameters in the first QoS parameters; the second feedback information is used for the home domain policy control network element to determine that a higher QoS parameter than the QoS parameter rejected by the first VPLMN and/or a QoS parameter rejected by the first VPLMN in the first QoS parameter is not sent to the home domain session management network element before a VPLMN change occurs; monitoring whether the VPLMN has changed; after the change of the VPLMN is monitored, sending notification information to the home domain policy control network element, wherein the notification information is used for notifying the change of the VPLMN, the notification information triggers the home domain policy control network element to send a third QoS parameter to the home domain session management network element, and the third QoS parameter comprises a QoS parameter rejected by the first VPLMN in the second QoS parameter and/or a QoS parameter with higher requirement than the QoS parameter rejected by the first VPLMN.