CN118055519A

CN118055519A - Information transmission method, session establishment device and storage medium

Info

Publication number: CN118055519A
Application number: CN202410178322.9A
Authority: CN
Inventors: 梁爽; 朱进国; 李振东
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2024-02-08
Filing date: 2024-02-08
Publication date: 2024-05-17

Abstract

The embodiment of the disclosure provides an information transmission method, a session establishment device and a storage medium, relates to the technical field of communication, and is used for establishing connection between UPF and SMF. The information transmission method comprises the following steps: transmitting relevant information of a user plane function UPF to a core network; receiving the related information of a Session Management Function (SMF) sent by a core network; based on the relevant information of the session management functions SMF, a connection between the user plane functions UPF session management functions SMF is established.

Description

Information transmission method, session establishment device and storage medium

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to an information transmission method, a session establishment device, and a storage medium.

Background

In the third generation mobile communication technology (3rd generation,3G) and the fourth generation mobile communication technology (the 4th generation mobile communication technology,4G), in order to enhance the coverage of a base station, the concept of a micro base station is introduced. The micro base station is also called a home base station, a small base station and the like, and can not only increase the coverage area of the base station, but also provide specific service requirements, such as broadband access, internet of things equipment connection and the like.

The fifth generation mobile communication technology (5th generation mobile communication technology,5G) is designed to take into account higher frequency bands and greater bandwidth, so that the coverage of base stations in 5G is slightly smaller than those in 3G and 4G, and does not support micro base stations. However, with the increasing 5G networks, the increasing 5G applications, in turn, reintroduce the probability of micro base stations for improving the coverage of the base stations. However, in the 5G system, the user plane and the control plane are separated, but the UPF and the SMF in the micro base station need to establish an association relationship to improve the coverage. Therefore, how to associate the UPF and the SMF is a problem to be solved.

Disclosure of Invention

The embodiment of the disclosure provides an information transmission method, a session establishment device and a storage medium, which are used for establishing connection between UPF and SMF.

In a first aspect, an information transmission method is provided, applied to a base station, where the base station integrates a user plane function UPF, and includes:

transmitting relevant information of a user plane function UPF to a core network;

Receiving the related information of a Session Management Function (SMF) sent by a core network;

Based on the relevant information of the session management functions SMF, a connection between the user plane functions UPF session management functions SMF is established.

In a second aspect, there is provided a further information transmission method applied to a core network, including:

receiving relevant information of a user plane function UPF sent by a base station integrating the user plane function UPF;

and sending the related information of the session management function SMF to the base station.

In a third aspect, a session establishment method is provided, applied to an access management function (ACCESS AND mobility management function, AMF) comprising:

Acquiring configuration information of a user plane function UPF integrated by a base station;

Based on the configuration information of the user plane function UPF, a session establishment request message is sent to the session management function SMF, where the session establishment request message is used to request to establish a PDU session of the terminal, and the session establishment request message includes information for indicating that the user plane function UPF is integrated in the base station.

In a fourth aspect, there is provided a communication apparatus comprising:

The communication module is used for sending the related information of the user plane function UPF to the core network;

The communication module is also used for receiving the related information of the session management function SMF sent by the core network;

and the processing module is used for establishing connection between the user plane function UPF session management functions SMF based on the related information of the session management functions SMF.

In a fifth aspect, there is provided a further communication device comprising:

The receiving module is used for receiving the related information of the user plane function UPF sent by the base station integrating the user plane function UPF;

and the sending module is used for sending the related information of the session management function SMF to the base station.

In a sixth aspect, there is provided a further communication device comprising:

The processing module is used for acquiring configuration information of a user plane function UPF integrated by the base station;

And the communication module is used for sending a session establishment request message to the session management function SMF based on the configuration information of the user plane function UPF, wherein the session establishment request message is used for requesting to establish the PDU session of the terminal, and the session establishment request message comprises information for indicating the integration of the user plane function UPF in the base station.

In a seventh aspect, there is provided a further communication device comprising a processor that when executing a computer program implements the information transmission method of the first aspect described above, or implements the information transmission method of the second aspect described above, or implements the session establishment method of the third aspect described above.

In an eighth aspect, a computer-readable storage medium is provided, the computer-readable storage medium comprising computer instructions; wherein when the computer instructions are executed, the information transmission method of the above first aspect is implemented, or the information transmission method of the above second aspect is implemented, or the session establishment method of the above third aspect is implemented.

A ninth aspect provides a computer program product comprising instructions which, when run on a computer, cause the computer to implement the information transmission method of the first aspect, or the information transmission method of the second aspect, or the session establishment method of the third aspect.

In the embodiment of the disclosure, the connection between the UPF and the SMF is established by using the related information of the UPF and the related information of the SMF, so that the success rate and the efficiency of establishing the connection can be improved, the communication delay is further reduced, and the service quality is improved.

Drawings

In order to more clearly illustrate the technical solutions of the present disclosure, the drawings that need to be used in some embodiments of the present disclosure will be briefly described below, and it is apparent that the drawings in the following description are only drawings of some embodiments of the present disclosure, and other drawings may be obtained according to these drawings to those of ordinary skill in the art.

Fig. 1 is a schematic diagram of a 4G system according to an embodiment of the disclosure;

fig. 2 is a schematic diagram of a 5G system according to an embodiment of the disclosure;

fig. 3 is an interaction schematic diagram of an information transmission method according to an embodiment of the disclosure;

Fig. 4 is an interaction schematic diagram of another information transmission method according to an embodiment of the disclosure;

fig. 5 is an interaction schematic diagram of another information transmission method according to an embodiment of the disclosure;

fig. 6 is an interaction schematic diagram of another information transmission method according to an embodiment of the disclosure;

fig. 7 is an interaction schematic diagram of another information transmission method according to an embodiment of the disclosure;

fig. 8 is an interaction schematic diagram of a session establishment method according to an embodiment of the disclosure;

fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the disclosure;

fig. 10 is a schematic structural diagram of still another communication device according to an embodiment of the present disclosure;

Fig. 11 is a schematic structural diagram of still another communication device according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of still another communication device according to an embodiment of the present disclosure.

Detailed Description

The following description of the technical solutions in the embodiments of the present disclosure will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present disclosure, and it is apparent that the described embodiments are only some embodiments of the present disclosure, not all embodiments. Based on the embodiments in this disclosure, all other embodiments that a person of ordinary skill in the art would obtain without making any inventive effort are within the scope of protection of this disclosure.

In the description of the present disclosure, unless otherwise indicated, "/" means "or" and, for example, a/B may mean a or B. "and/or" herein is merely an association relationship describing an association object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist together, and B exists alone. Furthermore, "at least one" means one or more, and "a plurality" means two or more. The terms "first," "second," and the like do not limit the number and order of execution, and the terms "first," "second," and the like do not necessarily differ.

It is noted that in this disclosure, words such as "exemplary" or "such as" are used to mean serving as examples, illustrations, or descriptions. Any embodiment or design described herein as "exemplary" or "e.g." should not be taken as preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "such as" is intended to present related concepts in a concrete fashion.

In 3G and 4G, in order to enhance coverage of a base station or provide a specific service for a home or a small-sized enterprise, a concept of a home base station is introduced. Home base stations are also called micro base stations, small base stations, etc., and in 3G and 4G, the problem of small range of base stations is solved. While 5G is designed, it is mainly considered higher frequency bands and greater bandwidths. Therefore, the coverage of the 5G base station is slightly smaller than that of the base stations in 3G and 4G, and does not support the home base station. But as 5G networks develop, 5G applications continue to increase. The third generation partnership project (3rd generation partner ship project,3GPP) introduced the concept of a residential radio access base station (premis es radio access station, PRAS) in the personal internet of things (personal ioi networks, PIN) and subscriber premises network (customer premises networks) topics during the R19 phase. PRAS is also known as micro base station and is mainly used to improve coverage of base stations, similar to the micro base station function in 3G and 4G. The indoor coverage of 5G is improved by increasing the frequency of using the micro base station. Traffic partially routed to the macro base station is offloaded in the micro base station, thus providing better voice call quality and better support for mobility within the enterprise. Through the application of the micro base station, the user experience of a user can be improved, the willingness to use 5G can be provided for enterprises, and the development of a 5G network is facilitated. In the above-mentioned subject, the management of the micro base station in 4G and the management of the closed access group (closed access group, CAG) in the non-public network (NPN) in 5G are referred to, and the micro base station access architecture of 5G is designed.

As shown in fig. 1, an architecture diagram of a 4G system according to an embodiment of the present disclosure is provided, in the 4G system, a user plane and a control plane are not separated, and a UPF and an SMF may directly establish a connection. However, as shown in fig. 2, an architecture diagram of a 5G system is provided for a public switch embodiment, in the 5G system, a user plane and a control plane are separated, so that a connection cannot be directly established between a UPF and an SMF, and a micro base station cannot be used normally. Therefore, how to associate the UPF and the SMF is a problem to be solved.

Based on this, the embodiment of the disclosure provides an information transmission method, which establishes a connection between a UPF and an SMF by using related information of the UPF and related information of the SMF, so as to improve success rate and efficiency of establishing the connection, thereby reducing communication delay and improving service quality.

The information transmission method and the session establishment method provided by the present disclosure may be applied to a 5G system as shown in fig. 2, and fig. 2 shows a schematic architecture diagram of the 5G system provided by the embodiment of the present disclosure.

As shown in fig. 2, the 5G system includes a terminal (UE), a radio access network (radio access network, RAN), an access and mobility management function (ACCESS AND mobility management function, AMF), an SMF, a unified data management function (unified DATA MANAGEMENT, UDM), a policy control function (policy control function, PCF), a UPF, a network storage function (network repository function, NRF), a Data Network (DN), a network slice selection function (network slice selection function, NSSF).

In some embodiments, the UE is able to access the operator network, or the customer premises network, through a wireless base station.

In some embodiments, the base stations in the RAN may be macro base stations or micro base stations.

In some embodiments, the AMF is also referred to as an AMF network element, an access and mobility management network element. AMF is mainly used for mobility management of UEs. Reachability management, connection management, and registration management. The AMF terminates the N2 interface to the RAN and the N1 NAS interface to the UE. For messages in which the N1 and N2 interfaces are involved in session management, the AMF passes it through to the SMF.

In some embodiments, the SMF is also referred to as an SMF network element, session management network element. The SMF is used for managing the session established by the user, including the establishment, modification and deletion of the session, and also including the establishment of the user plane at the network side.

In some embodiments, the UDM is also referred to as UDM network element, unified data management network element. The UDM is used to manage subscription data, application data, etc. of the UE, which may be stored in a unified data store (unified data repository, UDR). UDM and UDR may typically be co-located in a network. The subscription data comprises access and mobility management subscription data and post-session management subscription data. The AMF and SMF may obtain these subscription data from the UDM, respectively.

In some embodiments, the PCF is also referred to as PCF network element, policy control network element. The PCF is used for obtaining the policy, access management policy and session management policy of the UE by interacting with the PCF respectively, and can be divided into UE-PCF, AM-PCF and SM-PCF.

In some embodiments, the UPF is also referred to as a UPF network element, a user plane network element. The SMF formulates rules of data detection, forwarding, monitoring and the like according to the related information such as session management subscription, session management policy and the like, and sends the rules to the UPF. The UPF acts as a user plane data transfer node to implement the relevant rules formulated by the SMF. Before sending the session management rule of the UE to the UPF, the SMF needs to establish a node-level association connection with the UPF, and exchange information such as a port and an address available to the UPF. The association establishment at the node level may be initiated by SMF or UPF.

In some embodiments, NRF is also referred to as NRF network element, network storage network element. The NRF, as a functional network element for storing and querying network function profiles (network function profile, NF profiles), may store profiles of other NFs in the network. When other NFs need to use a certain NF without knowing the information of this NF, the NRF can be queried for the function by entering key parameters.

It should be noted that fig. 2 is only an exemplary frame diagram, the number of devices included in fig. 2 is not limited, the names of the respective devices are not limited, and the 5G system may include other devices in addition to the devices shown in fig. 2.

Fig. 3 shows an interaction diagram of an information transmission method provided by the present disclosure, which is applied to a base station and a core network, wherein the base station integrates a user plane function UPF, and the core network includes an AMF and an NRF. As shown in fig. 3, the information transmission method includes the steps of:

S101, the base station sends relevant information of a user plane function UPF to a core network. Correspondingly, the core network receives the relevant information of the user plane function UPF sent by the base station integrating the user plane function UPF.

S102, the core network sends the relevant information of the session management function SMF to the base station. Correspondingly, the base station receives the relevant information of the session management function SMF sent by the core network.

S103, the base station establishes connection between the user plane function UPF session management functions SMF based on the related information of the session management functions SMF.

In some embodiments, as shown in fig. 4, the steps S101 to S103 may be specifically implemented as the following steps:

s201, the base station sends configuration information of a user plane function UPF to an access management function AMF. Correspondingly, the access management function AMF in the core network receives configuration information of the user plane function UPF sent by the base station integrating the user plane function UPF.

In some embodiments, the base station sends configuration information of the user plane function UPF to the access management function AMF, which may be specifically implemented as: the first message is sent to an access management function AMF.

The first message is used for indicating that the base station requests to establish connection with the access management function AMF after being powered on, and the first message comprises configuration information of the user plane function UPF. The configuration information of the user plane function UPF comprises at least one of the following: slice information supported by the user plane function UPF, data network name (data network name, DNN) information supported by the user plane function UPF, SMF service area supported by the user plane, protocol data unit (PACKET DATA unit, PDU) session type supported by the user plane function UPF, internet protocol (internet protocol, IP) address range of a terminal configured by the user plane function UPF, tracking identifier (TRACKING AREA IDENTITY, TAI) list (list) supported by the user plane function UPF.

Exemplary, the slice information supported by the user plane function UPF includes single network slice selection assistance information (single network slice selection assistance information, S-NSSAI). The TAI list supported by the user plane function UPF is independent of the TAI list supported by the base station, and indicates that the TAI list supported by the user plane function UPF is the same as the TAI list supported by the base station. Or the TAI list supported by the user plane function UPF is not independent of the TAI list supported by the base station, which means that the TAI list supported by the user plane function UPF is different from the TAI list supported by the base station. In addition, the configuration information of the UPF may further include whether the UPF supports redundant transmission and the type of user interface supported by the UPF.

Still another example, the base station sends a first message to the AMF after power-up to initiate a Next Generation (NG) connection establishment request to the AMF. The first message carries configuration information of the UPF.

S202, the access management function AMF sends a third message to the network storage function NRF based on configuration information of the user plane function UPF. Accordingly, the network storage function NRF receives the third message sent by the access management function AMF.

Wherein the third message is for requesting discovery of the session management function SMF.

S203, the network storage function NRF sends a fourth message to the access management function AMF, and correspondingly, the access management function AMF receives the fourth message sent by the network storage function NRF.

Wherein the fourth message comprises configuration information of the session management function SMF.

Illustratively, after receiving the configuration information of the UPF, the AMF initiates a discovery session management function SMF request to the NRF according to parameters in the configuration information of the UPF and slice and location information supported by the AMF. Specifically, the AMF uses the configuration information of the UPF or the parameters obtained by comparing the configuration information of the UPF with the slice and location information supported by the AMF as input parameters of the query, for example, the input parameters may be server identification, TAI list, S-nsai, DNN and other query parameters of the SMF. Next, the NRF determines the configuration information of the SMF according to the query parameters input by the AMF, and sends a fourth message carrying the configuration information of the SMF to the AMF.

S204, the access management function AMF sends configuration information of the session management function SMF to the base station. Correspondingly, the base station accesses the configuration information of the session management function SMF sent by the management function AMF.

In some embodiments, the base station receives the configuration information of the session management function SMF sent by the access management function AMF, which may be specifically implemented as: and the base station receives a second message sent by the access management function AMF.

Wherein the second message is for responding to the first message, the second message comprising configuration information of the session management function SMF.

Illustratively, the base station receives the configuration information of the SFM and forwards the configuration information to the base station integrated UPF through the internal interface.

S205, the base station sends a fifth message to the session management function SMF based on the configuration information of the session management function SMF. Accordingly, the session management function SMF receives the fifth message sent by the base station.

Wherein the fifth message is for requesting to establish a connection between the user plane network function UPF and the session management function SMF.

Illustratively, the base station integrated UPF sends a fifth message to the SMF requesting establishment of a packet forwarding control protocol (packet forwarding control protocol, PFCP) connection based on the configuration information of the SMF. Wherein the fifth message includes at least one of the following: node identification of the UPF, UPF assignable UE address information, list of supported functions, available address pool message.

S206, the session management function SMF sends a sixth message to the base station. Accordingly, the base station receives the sixth message sent by the session management function SMF.

The sixth message is a response message of the fifth message.

Illustratively, after receiving the PFCP connection establishment request sent by the base station integrated UPF, the SMF stores information of the base station integrated UPF and sends a response message, that is, a sixth message, to the base station integrated UPF. Wherein the sixth message includes a response result. For example, the response result included in the sixth message is that connection establishment is agreed, and in addition, the list of functions supported by the SMF is included in the sixth message. Or the response included in the sixth message results in refusal to establish the connection.

It should be noted that, in this embodiment, the message interaction of the base station integrated UPF and the AMF is transmitted through an NG message on the N2 interface between the base station and the AMF. In order to simplify the processing procedure of the base station, the base station only carries out transparent transmission on the interacted information, only carries out forwarding processing on the configuration information of the integrated UPF of the base station, directly sends the configuration information of the UPF to the AMF, and does not recognize and process the configuration information and other information of the UPF.

In some embodiments, as shown in fig. 5, the steps S101 to S103 may be further implemented as the following steps:

S301, the base station sends information for indicating the base station integrated user plane function UPF to the access management function AMF. Correspondingly, the access management function AMF in the core network receives information sent by the base station and used for indicating the base station integrated user plane function UPF.

Illustratively, the base station initiates an NG connection setup request to the AMF upon power up. Wherein the connection establishment request carries information indicating the base station integrated UPF. In addition, the connection establishment request may also carry TAI information supported by the UPF. If the TAI information supported by the UPF is not carried, the TAI supported by the UPF is consistent with the TAI supported by the base station.

S302, the access management function AMF sends address information of the network storage function NRF to the base station. Correspondingly, the base station receives address information of the network storage function NRF sent by the access management function AMF.

Illustratively, the AMF, upon receiving information for indicating the base station to integrate the UPF, determines address information of available NRFs according to a UPF supporting TAI range, and transmits the address information of the NRFs to the base station.

S303, the base station transmits a third message to the network storage function NRF based on the address information of the network storage function NRF. Correspondingly, the network storage function NRF receives a third message sent by the base station.

Illustratively, the base station integrated UPF sends a third message to the NRF requesting discovery of the SMF. The third message carries at least one of the following query parameters: service area identification of SMF, TAI list, S-NSSAII, DNN.

And S304, the network storage function NRF sends a fourth message to the base station. Correspondingly, the base station receives a fourth message sent by the network storage function NRF.

Illustratively, the NRF determines configuration information of at least one SMF according to the query parameter carried by the third message, and loads the configuration information of at least one SMM in the fourth message, and sends the configuration information to the base station integrated UPF.

Wherein the fourth message comprises configuration information of the session management function SFM.

S305, the base station sends a fifth message to the session management function SMF based on the configuration information of the session management function SMF. Accordingly, the session management function SMF receives the fifth message sent by the base station.

Illustratively, the base station integrated UPF sends a fifth message to the SMF to request establishment of a packet forwarding control protocol (packet forwarding control protocol, PFCP) connection based on the configuration information of the SFM carried by the fourth message. Wherein the fifth message includes at least one of the following: node identification of the UPF, UPF assignable UE address information, list of supported functions, available address pool message.

S306, the session management function SMF sends a sixth message to the base station. Accordingly, the base station receives the sixth message sent by the session management function SMF.

The sixth message is a response message of the fifth message.

It should be noted that, in this embodiment, the message interaction of the base station integrated UPF and the AMF is transmitted through an NG message on the N2 interface between the base station and the AMF. In order to simplify the processing procedure of the base station, the base station only carries out transparent transmission on the interactive information, does not recognize and process the information related to the NFR returned by the AMF and other information, and only forwards the information to the base station integrated UPF through an internal interface.

In some embodiments, as shown in fig. 6, the steps S101 to S103 may be further implemented as the following steps:

S401, the base station sends configuration information of a user plane function UPF to an access management function AMF. Correspondingly, the access management function AMF receives configuration information of the user plane function UPF sent by the base station.

Wherein the configuration information of the UPF includes at least one of: slice information supported by the user plane function UPF, data network name (data network name, DNN) information supported by the user plane function UPF, SMF service area supported by the user plane, PDU session type supported by the user plane function UPF, internet protocol (internet protocol, IP) address range of the terminal configured by the user plane function UPF support, tracking identifier (TRACKING AREA IDENTITY, TAI) list (list) supported by the user plane function UPF.

Still further exemplary, to support the SMF querying the UPF, the configuration information of the UPF may further include an address where the UPF is addressable by other NFs or NF identification information of the UPF.

S402, the access management function AMF sends a seventh message to the network storage function NRF. Accordingly, the network storage function NRF receives the seventh message sent by the access management function AMF.

The seventh message is used for requesting to register the user plane function UPF, and the seventh message includes configuration information of the user plane function UPF.

In order to ensure security during registration, the network may be configured to allow the AMF to register configuration information of other NFs with the NRF, so that the network may pass security authentication without considering the registration as network attack. For example, the AMF registers configuration information of the UPF with the NRF.

Thus, by allowing the AMF to register configuration information of other NFs with the NRF, the network can verify the validity of the registration request through security authentication, preventing potential network attack. In addition, AMF is allowed to register UPF configuration information to NRF, so that the registration process can be simplified, and the registration efficiency is improved.

It should be appreciated that if the SMF has previously registered with the network and subscribed to the NRF for notification of UPF up-line. The NRF may notify the SMF that the UPF is already subscribed to online according to the configuration information of the registered UPF and transmit the list of UPFs and the configuration information of the UPFs to the SMF.

S403, the session management function SMF sends a fifth message to the base station. Accordingly, the base station receives the fifth message sent by the session management function SMF.

Wherein the fifth message is used for establishing a connection between the user plane function UPF and the session management function SMF, and the fifth message comprises information about the session management function SMF. The relevant information of the session management function SMF includes: the identity of the session management function SMF, the list of supported functions.

Illustratively, after the SMF receives the configuration information of the UPF, a fifth message is sent to the UPF to initiate the PFCP connection establishment request based on the configuration information of the UPF.

S404, the base station sends a sixth message to the session management function SMF based on the related information of the session management function SMF. Accordingly, the session management function SMF receives the sixth message sent by the base station.

The sixth message is a response message of the fifth message.

Illustratively, after receiving the related information of the SMF carried by the fifth message, the base station integrated UPF stores the related information of the SMF, and sends a sixth message to the SMF, in response to the fifth message. The sixth message includes at least one of: node identification of the UPF, address information of a terminal of UPF supporting configuration, function list supported by the UPF, and address pool information available to the UPF.

It should be noted that, in this embodiment, the message interaction of the base station integrated UPF and the AMF is transmitted through an NG message on the N2 interface between the base station and the AMF. In order to simplify the processing procedure of the base station, the base station only carries out transparent transmission on the interacted information, only carries out forwarding processing on the configuration information of the UPF, does not recognize and process the configuration information of the UPF and other information, and only receives and forwards the configuration information to the AMF through an internal interface.

In some embodiments, as shown in fig. 7, the steps S101 to S103 may be further implemented as the following steps:

S501, the base station sends information for indicating the base station integrated user plane function UPF to the access management function AMF. Correspondingly, the access management function AMF in the core network receives information sent by the base station and used for indicating the base station integrated user plane function UPF.

S502, the access management function AMF sends address information of the network storage function NRF to the base station. Correspondingly, the base station receives address information of the network storage function NRF sent by the access management function AMF.

Illustratively, the base station determines address information of available NRFs based on a TAI range in the information for instructing the base station to integrate the user plane function UPF, and transmits the address information of the NRFs to the base station.

S503, the base station transmits a seventh message to the network storage function NRF based on the address information of the network storage function NRF. Accordingly, the network storage function NRF receives the seventh message sent by the base station.

The seventh message is used for requesting to register the user plane function UPF, and the seventh message includes configuration information of the user plane function UPF. The configuration information of the user plane function UPF comprises at least one of the following: slice information supported by the user plane function UPF, data network name (data network name, DNN) information supported by the user plane function UPF, SMF service area supported by the user plane, protocol data unit (PACKET DATA unit, PDU) session type supported by the user plane function UPF, internet protocol (internet protocol, IP) address range of a terminal configured by the user plane function UPF, tracking identifier (TRACKING AREA IDENTITY, TAI) list (list) supported by the user plane function UPF.

S504, the network storage function NRF registers the user plane function UPF based on the seventh message, and sends configuration information of the user plane function UPF to the session management function SMF.

Note that the SMF has already registered in the network and subscribes to the online notification of the corresponding UPF. When the NRF registers based on the UPF configuration information, the SMF is informed, and the UPF configuration information and a UPF list are sent to the SMF.

S505, the session management function SMF sends a fifth message to the user plane function UPF based on the configuration information of the user plane function UPF. Accordingly, the base station receives the fifth message sent by the session management function SMF.

Wherein a fifth message is used for requesting to establish a connection between the user plane function UPF and the session management function SMF, the fifth message comprising information about the session management function SMF. The relevant information of the session management function SMF includes: the identity of the session management function SMF, the list of supported functions.

S506, the base station sends a sixth message to the session management function SMF based on the related information of the session management function SMF. Accordingly, the session management function SMF receives the sixth message sent by the base station.

The sixth message is a response message of the fifth message.

In some embodiments, the base station updates the configuration information of the user plane function UPF, and sends the updated configuration information of the user plane function UPF to the access management function AMF.

Illustratively, when the configuration information of the base station integrated UPF is updated, the base station integrated UPF may send the updated configuration information to the base station through the internal interface. The base station sends a configuration update request to the AMF, and sends the updated configuration information of the UPF to the AMF. The AMF judges whether the SMF query needs to be re-executed according to the locally matched information.

In some embodiments, the base station updates based on the configuration information of the session management function SMF, and receives the updated configuration information of the session management function SMF sent by the access management function AMF.

Still another exemplary, the AMF may subscribe to the update instance of the configuration file of the SMF through the network function state (NF Statue). In this way, after the configuration information of the SMF is updated, the AMF can receive the update notification of the SMF, so as to trigger the AMF to initiate the update flow of NG configuration, so that the AMF notifies the base station integrated UPF that the SMF is updated, and sends the updated configuration information of the SMF to the base station.

In the four embodiments described above, if there is only one base station management unit in the network, then the query subscription relationship of UPF and SMF may exist in the NF of this individual device. The NRF in all the above flows can be replaced by the network element to complete the relevant functions.

Fig. 8 shows an interaction diagram of a session establishment method provided by the present disclosure, which is applied to an access management function AMF. As shown in fig. 8, the session establishment method includes the steps of:

S701, the terminal sends PDU session establishment request to an access management function AMF.

Wherein the PDU session establishment request includes DNN and S-NSSAI that wish to establish a PDU session.

S702, acquiring configuration information of a user plane function UPF integrated by a base station.

In some embodiments, the access management function AMF receives a connection establishment request message sent by the base station.

The connection establishment request message includes configuration information of a user plane function UPF.

Illustratively, in the above S201, the base station transmits configuration information of the user plane function UPF to the access management function AMF. Correspondingly, the access management function AMF in the core network receives configuration information of the user plane function UPF sent by the base station integrating the user plane function UPF.

Still another exemplary embodiment of the present invention is that the base station transmits configuration information of the user plane function UPF to the access management function AMF in S401 described above. Correspondingly, the access management function AMF receives configuration information of the user plane function UPF sent by the base station.

In other embodiments, the access management function AMF receives the N2 message sent by the base station on a single UE basis.

Wherein the N2 message includes configuration information of the user plane function UPF.

Illustratively, since the base station does not know the type of the terminal initiated non-access stratum (NAS) message, the configuration information of the user plane function UPF needs to be sent to the access management function AMF in every message that may transmit a PDU session establishment request. Wherein the N2 message comprises any one of: initial terminal message and uplink direct transmission message.

S703, the access management function AMF sends a session establishment request message to the session management function SMF based on the configuration information of the user plane function UPF. Accordingly, the session management function SMF receives the session establishment request message sent by the AMF.

The session establishment request message is used for requesting to establish a PDU session of the terminal, and the session establishment request message comprises information for indicating that the user plane function UPF is integrated in the base station.

If the information of the user plane function UPF integrated in the base station indicated in the session establishment request message is configuration information of the user plane function UPF, the AMF sends the session establishment request message to the session management function SMF.

The session establishment request information includes DNN and S-NSSAI requested by the terminal, for example. The AMF selects proper configuration information for matching according to DNN and S-NSSAI requested by the terminal. If the configuration information of the user plane function UPF can support the corresponding DNN and S-NSSAI in the session establishment request information, the AMF sends a session establishment request message to the session management function SMF.

In the case that the AMF acquires the configuration information of the UPF, the session establishment request message sent by the AMF may also carry the configuration information of the UPF.

S704, the session management function SMF sends a subscription data request to the unified data management UDM. Accordingly, the unified data management UDM sends subscription data to the session management function SMF.

S705, the session management function SMF sends a subscription data request to the policy control function PCF. Accordingly, the unified data management UDM sends subscription data to the session management function SMF.

Illustratively, the SMF obtains the subscription data in the PCF and the SMF, establishes session management policy connection establishment/update.

S706, the session management function SMF sends a PFCP association setup request to the base station (PFCP Session Establishment Request). Accordingly, the base station transmits a PFCP association setup response to the session management function SMF.

S707, the session management function SMF sends a PFCP session establishment request to the base station (PFCP Session Establishment Request). Accordingly, the base station transmits a PFCP session establishment response to the session management function SMF.

In some embodiments, the access management function AMF transparently passes signaling between the session management function SMF and the user plane function UPF.

Illustratively, the SMF determines whether the base station integrated UPF can act as a PDU session anchor (PDU session anchor, PSA). If the base station integrated UPF can be used as a PDU session anchor point, the PFCP association establishment related message, the PFCP session establishment related message, the PFCP report message, the PFCP association update and the PFCP association release can all interact through the N2 message transmission (MESSAGE TRANSFER) between the base station and the SMF. Wherein the N4 message is carried in the N2 MESSAGE TRANSFER message as a transparent information element (information element, IE). Interaction between the base station and the SMF occurs through the AMF. The base station only carries out transparent transmission on the N4 message, and does not carry out identification and processing. Since the PFCP association needs to be established before the PFCP session is established. If a PFCP association has been previously established, S706 may be skipped.

If the N2 connection between the micro base station and the AMF is released as the terminal enters the idle state, the SMF and UPF should avoid initiating PFCP messages at this time, thereby avoiding unnecessary N2 connection establishment.

In this way, the AMF indicates the UPF integrated by the current base station of the SMF through the session establishment request message, so that the efficiency of establishing the session is improved, the communication delay is reduced, and the user experience is improved.

It will be appreciated that the communication device, in order to achieve the above-described functions, comprises corresponding hardware structures and/or software modules performing the respective functions. Those of skill in the art will readily appreciate that the algorithm steps of the examples described in connection with the embodiments disclosed herein may be implemented as hardware or a combination 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 disclosure.

The embodiment of the disclosure may divide the functional modules of the communication device according to the embodiment of the method described above, for example, each functional module may be divided for each function, or two or more functions may be integrated into one functional module. The integrated modules may be implemented in hardware or software. It should be noted that, in the embodiment of the present disclosure, the division of the modules is merely a logic function division, and other division manners may be implemented in actual practice. The following description will take an example of dividing each function module into corresponding functions.

Fig. 9 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure, where the communication device may perform the data transmission method provided in the foregoing method embodiment. As shown in fig. 9, the communication apparatus 90 includes a communication module 901 and a processing module 902.

The communication module 901 is configured to send information related to a user plane function UPF to a core network.

The communication module 901 is further configured to receive related information of the session management function SMF sent by the core network.

A processing module 902, configured to establish a connection between the user plane function UPF and the session management function SMF based on the related information of the session management function SMF.

In some embodiments, the communication module 901 is specifically configured to: transmitting configuration information of a user plane function UPF to an access management function AMF; and receiving configuration information of a Session Management Function (SMF) sent by the Access Management Function (AMF).

In some embodiments, the communication module 901 is specifically configured to: sending a first message to an access management function AMF, wherein the first message is used for indicating that a base station requests to establish connection with the access management function AMF after power-on, and the first message comprises configuration information of a user plane function UPF; and receiving a second message sent by the access management function AMF, wherein the second message is used for responding to the first message, and the second message comprises configuration information of the session management function SMF.

In some embodiments, the communication module 901 is specifically configured to: transmitting information for indicating a base station integrated user plane function UPF to an access management function AMF; receiving address information of a network storage function NRF sent by an access management function AMF; based on the address information of the network storage function NRF, sending a third message to the network storage function NRF, the third message being for requesting to discover the session management function SMF; a fourth message sent by the network storage function NRF is received, the fourth message comprising configuration information of the session management function SFM.

In some embodiments, the processing module 902 is specifically configured to: based on the configuration information of the session management function SMF, sending a fifth message to the session management function SMF, the fifth message being used for requesting to establish a connection between the user plane network function UPF and the session management function SMF; and receiving a sixth message sent by the session management function SMF, wherein the sixth message is a response message of the fifth message.

In some embodiments, the communication module 901 is specifically configured to: transmitting configuration information of a user plane function UPF to an access management function AMF; and receiving a fifth message sent by the session management function SMF, wherein the fifth message is used for requesting to establish a connection between the user plane function UPF and the session management function SMF, and the fifth message comprises related information of the session management function SMF.

In some embodiments, the communication module 901 is specifically configured to: transmitting information for indicating a base station integrated user plane function UPF to an access management function AMF; receiving address information of a network storage function NRF sent by an access management network function; based on the address information of the network storage function NRF, a seventh message is sent to the network storage function NRF, the seventh message is used for requesting to register the user plane function UPF, and the seventh message comprises configuration information of the user plane function UPF; and receiving a fifth message sent by the session management function SMF, wherein the fifth message is used for requesting to establish a connection between the user plane function UPF and the session management function SMF, and the fifth message comprises related information of the session management function SMF.

In some embodiments, the session management function SMF related information includes: the identity of the session management function SMF, the list of supported functions.

In some embodiments, the processing module 902 is specifically configured to: and based on the related information of the session management function SMF, sending a sixth message to the session management function SMF, wherein the sixth message is a response message of the fifth message.

In some embodiments, the slice information supported by the user plane function UPF, the DNN information supported by the user plane function UPF, the SMF service area supported by the user plane function UPF, the PDU session type supported by the user plane function UPF, the IP address range of the terminal configured by the user plane function UPF, and the TAI list supported by the user plane function UPF.

In some embodiments, the list of TAIs supported by the user plane function UPF is independent of the list of TAIs supported by the base station.

In some embodiments, the communication module 901 is further configured to: updating is carried out based on the configuration information of the user plane function UPF, and the updated configuration information of the user plane function UPF is sent to the access management function AMF.

In some embodiments, the communication module 901 is further configured to: based on the configuration information of the session management function SMF, updating occurs, and the updated configuration information of the session management function SMF sent by the access management function AMF is received.

Fig. 10 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure, where the communication device may perform the data transmission method provided in the foregoing method embodiment. As shown in fig. 10, the communication apparatus 100 includes a receiving module 1001 and a transmitting module 1002.

The receiving module 1001 is configured to receive information about a user plane function UPF sent by a base station integrating the user plane function UPF.

A sending module 1002, configured to send, to a base station, information related to a session management function SMF.

In some embodiments, the receiving module 1001 is specifically configured to: the access management function AMF in the core network receives configuration information of the user plane function UPF sent by a base station integrating the user plane function UPF.

In some embodiments, the sending module 1002 is specifically configured to: the access management function AMF sends configuration information of the session management function SMF to the base station.

In some embodiments, the sending module 1002 is further configured to: the access management function AMF sends a third message to the network storage function NRF based on the configuration information of the user plane function UPF, the third message being used for requesting to discover the session management function SMF; the receiving module 1001 is further configured to: the access management function AMF receives a fourth message sent by the network storage function NRF, the fourth message comprising configuration information of the session management function SMF.

In some embodiments, the sending module 1002 is specifically configured to: the session management function SMF sends a fifth message to the base station, the fifth message being for requesting to establish a connection between the user plane function UPF and the session management function SMF, the fifth message comprising information about the session management function SMF.

In some embodiments, the sending module 1002 is further configured to: the access management function AMF sends a seventh message to the network storage function NRF requesting registration of the user plane function UPF, the seventh message comprising configuration information of the user plane function UPF.

In some embodiments, the receiving module 1001 is specifically configured to: an access management function AMF in the core network receives information sent by the base station and used for indicating a base station integrated user plane function UPF.

In some embodiments, the sending module 1002 is further configured to: the access management function AMF sends address information of the network storage function NRF to the base station.

In some embodiments, the sending module 1002 is specifically configured to: the network storage function NRF receives a third message sent by the base station, wherein the third message is used for requesting to discover the session management function SMF; the network storage function NRF sends a fourth message to the base station, the fourth message comprising information about the session management function SMF.

In some embodiments, the receiving module 1001 is further configured to: the network storage function NRF receives a seventh message sent by the base station, wherein the seventh message is used for requesting to register the user plane function UPF, and the seventh message comprises configuration information of the user plane function UPF; the sending module 1002 is further configured to: the network storage function NRF registers the user plane function UPF based on the seven messages and sends configuration information of the user plane function UPF to the session management function SMF; the session management function SMF sends a fifth message to the user plane function UPF based on the configuration information of the user plane function UPF, the fifth message being for requesting to establish a connection between the user plane function UPF and the session management function SMF, the fifth message comprising information about the session management function SMF.

Fig. 11 is a schematic structural diagram of a communication device according to an embodiment of the present disclosure, where the communication device may perform the data transmission method provided in the foregoing method embodiment. As shown in fig. 11, the communication device 110 includes a processing module 1101 and a communication module 1102.

The processing module 1101 is configured to obtain configuration information of a user plane function UPF integrated by the base station.

The communication module 1102 is configured to send a session establishment request message to the session management function SMF based on configuration information of the user plane function UPF, where the session establishment request message is used for requesting to establish a PDU session of the terminal, and the session establishment request message includes information for indicating that the user plane function UPF is integrated in the base station.

In some embodiments, the processing module 1101 is specifically configured to: and receiving a connection establishment request message sent by the base station, wherein the connection establishment request message is used for requesting to establish connection between the base station and an Access Management Function (AMF), and comprises configuration information of a User Plane Function (UPF).

In some embodiments, the processing module 1101 is specifically configured to: the receiving base station transmits an N2 message based on a single UE, the N2 message including configuration information of a user plane function UPF.

In the case where the functions of the above-described integrated modules are implemented in the form of hardware, the embodiments of the present disclosure provide another possible structure of the communication apparatus referred to in the above-described embodiments. As shown in fig. 12, the communication device 120 includes: processor 1202, bus 1204. Optionally, the communication device may further comprise a memory 1201; optionally, the communication device 120 may further comprise a communication interface 1203.

The processor 1202 may be the various illustrative logical blocks, modules, and circuits described in connection with the embodiments of the disclosure. The processor 1202 may be a central processor, a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component, or any combination thereof. Which may implement or perform the various exemplary logic blocks, modules and circuits described in connection with embodiments of the disclosure. The processor 1202 may also be a combination that performs computing functions, e.g., including one or more microprocessor combinations, a combination of a DSP and a microprocessor, etc.

A communication interface 1203 is configured to connect with other devices via a communication network. The communication network may be an ethernet, a radio access network, a wireless local area network (wireless local area networks, WLAN), etc.

The memory 1201 may be, but is not limited to, a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (random access memory, RAM) or other type of dynamic storage device that can store information and instructions, or an electrically erasable programmable read-only memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-only memory, EEPROM), magnetic disk storage or other magnetic storage device, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer.

As a possible implementation, the memory 1201 may exist separately from the processor 1202, and the memory 1201 may be connected to the processor 1202 by the bus 1204 for storing instructions or program code. The processor 1202, when invoking and executing instructions or program code stored in the memory 1201, is capable of implementing the information transmission method provided by the embodiments of the present disclosure, or implementing the session establishment method provided by the embodiments of the present disclosure.

In another possible implementation, the memory 1201 may also be integrated with the processor 1202.

Bus 1204, which may be an extended industry standard architecture (extended industry standard architecture, EISA) bus, or the like. Bus 1204 may be classified as an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in fig. 12, but not only one bus or one type of bus.

Some embodiments of the present disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) having stored therein computer program instructions that, when run on a computer, cause the computer to perform the information transmission method of any of the above embodiments, or to perform the session establishment method of any of the above embodiments.

By way of example, the computer-readable storage media described above can include, but are not limited to: magnetic storage devices (e.g., hard Disk, floppy Disk or tape, etc.), optical disks (e.g., compact Disk (CD), digital versatile Disk (DIGITAL VERSATILE DISK, DVD), etc.), smart cards, and flash Memory devices (e.g., erasable programmable read-Only Memory (EPROM), card, stick, or key drive, etc.). Various computer-readable storage media described in this disclosure may represent one or more devices and/or other machine-readable storage media for storing information. The term "machine-readable storage medium" can include, without being limited to, wireless channels and various other media capable of storing, containing, and/or carrying instruction(s) and/or data.

The disclosed embodiments provide a computer program product comprising instructions which, when run on a computer, cause the computer to perform the information transmission method as in any of the embodiments described above, or to perform the session establishment method as in any of the embodiments described above.

The foregoing is merely a specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, and any changes or substitutions within the technical scope of the disclosure should be covered by the protection scope of the disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

1. An information transmission method, applied to a base station, where the base station integrates a user plane function UPF, the method comprising:

transmitting the related information of the user plane function UPF to a core network;

Receiving the related information of a Session Management Function (SMF) sent by the core network;

And establishing connection between the session management functions SMF of the user plane function UPF based on the related information of the session management functions SMF.

2. The method according to claim 1, wherein said sending information about the user plane function UPF to a core network comprises:

transmitting configuration information of the user plane function UPF to an access management function AMF;

the receiving the related information of the session management function SMF sent by the core network includes:

and receiving configuration information of the session management function SMF sent by the access management function AMF.

3. The method according to claim 2, wherein said sending configuration information of said user plane function UPF to an access management function AMF comprises:

sending a first message to the Access Management Function (AMF), wherein the first message is used for indicating that the base station requests to establish connection with the Access Management Function (AMF) after being electrified, and the first message comprises configuration information of the User Plane Function (UPF);

The receiving the configuration information of the session management function SMF sent by the access management function AMF includes:

And receiving a second message sent by the access management function AMF, wherein the second message is used for responding to the first message, and the second message comprises configuration information of the session management function SMF.

4. The method according to claim 1, wherein said sending information about the user plane function UPF to a core network comprises:

Transmitting information for indicating the base station to integrate the user plane function UPF to an access management function AMF;

Receiving address information of a network storage function NRF sent by the access management function AMF;

transmitting a third message to the network storage function NRF based on address information of the network storage function NRF, the third message being used for requesting discovery of a session management function SMF;

And receiving a fourth message sent by the network storage function NRF, wherein the fourth message comprises configuration information of the session management function SFM.

5. The method according to claim 2 or 4, wherein said establishing a connection between said user plane function UPF and said session management function SMF based on information about said session management function SMF comprises:

Based on the configuration information of the session management function SMF, sending a fifth message to the session management function SMF, where the fifth message is used to request to establish a connection between the user plane function UPF and the session management function SMF;

and receiving a sixth message sent by the session management function SMF, wherein the sixth message is a response message of the fifth message.

6. The method according to claim 1, wherein said sending information about the user plane function UPF to a core network comprises:

And receiving a fifth message sent by the session management function SMF, where the fifth message is used to request to establish a connection between the user plane function UPF and the session management function SMF, and the fifth message includes information related to the session management function SMF.

7. The method according to claim 1, wherein said sending information about the user plane function UPF to a core network comprises:

Receiving address information of a network storage function NRF sent by the access management network function;

Transmitting a seventh message to the network storage function NRF based on the address information of the network storage function NRF, the seventh message being used for requesting registration of the user plane function UPF, the seventh message including configuration information of the user plane function UPF;

8. The method according to claim 6 or 7, wherein the session management function, SMF, related information comprises: and the session management function SMF is identified and supported by the function list.

9. The method according to claim 6 or 7, characterized in that said establishing a connection between said user plane function UPF and said session management function SMF based on information about said session management function SMF comprises:

And based on the related information of the session management function SMF, sending a sixth message to the session management function SMF, wherein the sixth message is a response message of the fifth message.

10. The method according to claim 2 or 6, characterized in that the configuration information of the user plane function UPF comprises at least one of the following: the slice information supported by the user plane function UPF, DNN information supported by the user plane function UPF, SMF service area supported by the user plane function UPF, PDU session type supported by the user plane function UPF, IP address range of the terminal supported and configured by the user plane function UPF, and TAI list supported by the user plane function UPF.

11. The method of claim 10, wherein the list of TAIs supported by the user plane function UPF is independent of the list of TAIs supported by the base station.

12. The method according to claim 1, wherein the method further comprises:

updating based on the configuration information of the user plane function UPF, and sending the updated configuration information of the user plane function UPF to an access management function AMF.

13. The method according to claim 1, wherein the method further comprises:

And based on the configuration information of the session management function SMF, updating, and receiving the updated configuration information of the session management function SMF sent by the access management function AMF.

14. An information transmission method, applied to a core network, comprising:

15. The method of claim 14, wherein the receiving the user plane function UPF related information sent by the base station integrating the user plane function UPF comprises:

The access management function AMF in the core network receives configuration information of the user plane function UPF sent by a base station integrating the user plane function UPF.

16. The method of claim 15, wherein the sending the base station of the session management function SMF related information comprises:

the access management function AMF sends configuration information of the session management function SMF to the base station.

17. The method of claim 16, wherein the method further comprises:

the access management function AMF sends a third message to the network storage function NRF based on the configuration information of the user plane function UPF, wherein the third message is used for requesting to discover the session management function SMF;

The access management function AMF receives a fourth message sent by the network storage function NRF, said fourth message comprising configuration information of the session management function SMF.

18. The method of claim 14, wherein the sending the base station of the session management function SMF related information comprises:

The session management function SMF sends a fifth message to the base station, where the fifth message is used to request to establish a connection between the user plane function UPF and the session management function SMF, and the fifth message includes information related to the session management function SMF.

19. The method of claim 15, wherein the method further comprises:

The access management function AMF sends a seventh message to the network storage function NRF, where the seventh message is used to request registration of the user plane function UPF, and the seventh message includes configuration information of the user plane function UPF.

20. The method of claim 14, wherein the receiving the user plane function UPF related information sent by the base station integrating the user plane function UPF comprises:

and the access management function AMF in the core network receives information sent by the base station and used for indicating the base station integrated user plane function UPF.

21. The method of claim 20, wherein the method further comprises:

The access management function AMF sends address information of a network storage function NRF to the base station.

22. The method of claim 21, wherein the sending the base station of the session management function SMF related information comprises:

the network storage function NRF receives a third message sent by the base station, where the third message is used for requesting to discover the session management function SMF;

the network storage function NRF sends a fourth message to the base station, said fourth message comprising information about the session management function SMF.

23. The method of claim 21, wherein the method further comprises:

The network storage function NRF receives a seventh message sent by the base station, where the seventh message is used to request to register the user plane function UPF, and the seventh message includes configuration information of the user plane function UPF;

the network storage function NRF registers the user plane function UPF based on the seven messages and sends configuration information of the user plane function UPF to the session management function SMF;

The session management function SMF sends a fifth message to the user plane function UPF based on the configuration information of the user plane function UPF, where the fifth message is used to request to establish a connection between the user plane function UPF and the session management function SMF, and the fifth message includes information related to the session management function SMF.

24. A session establishment method, applied to an access management function AMF, the method comprising:

Based on the configuration information of the user plane function UPF, a session establishment request message is sent to a session management function SMF, wherein the session establishment request message is used for requesting to establish a PDU session of a terminal, and the session establishment request message comprises information for indicating that the user plane function UPF is integrated in the base station.

25. The method of claim 24, wherein the obtaining configuration information of a user plane function UPF integrated by the base station includes:

And receiving a connection establishment request message sent by the base station, wherein the connection establishment request message is used for requesting to establish connection between the base station and the access management function AMF, and the connection establishment request message comprises configuration information of the user plane function UPF.

26. The method of claim 24, wherein the obtaining configuration information of a user plane function UPF integrated by the base station includes:

and receiving the N2 message sent by the base station and based on the single UE, wherein the N2 message comprises configuration information of the user plane function UPF.

27. The method according to claim 24, characterized in that the access management function AMF transparently passes signalling between the session management function SMF and the user plane function UPF.

28. A communication device comprising a processor which, when executing a computer program, implements the method of information transmission according to any one of claims 1 to 13, or implements the method of information transmission according to any one of claims 14 to 23, or implements the method of session establishment according to any one of claims 24 to 27.

29. A computer-readable storage medium, the computer-readable storage medium comprising computer instructions; wherein the computer instructions, when executed, implement the information transmission method of any one of claims 1 to 13, or the information transmission method of any one of claims 14 to 23, or the session establishment method of any one of claims 24 to 27.