CN115314409A - Network state information acquisition method and system - Google Patents

Abstract

The present invention provides a method and system for acquiring network state information, and relates to the technical field of communications. The method includes: first, the first user plane device parses the first GTP-U message, and collects the first INT metadata of the first user plane device according to the INT instruction pre-delivered by the control plane device, and generates a second GTP-U The U packet is sent to the second user plane device. Then, the second user plane device parses the second GTP-U packet, collects the second INT metadata of the second user plane device according to the INT instruction, and stores the first The INT metadata and the second INT metadata are sent to the control plane device, and finally, the control plane device receives the first INT metadata and the second INT metadata, and stores them in a preset database. In this application, by collecting the INT metadata of each user plane device, the application of in-band network telemetry in the core network is realized, and based on the INT metadata, network status information perception of high-precision and various types of service traffic can be realized.

Description

Method and system for acquiring network status information

technical field

The present invention relates to the field of communication technology, in particular to a method and system for acquiring network state information.

Background technique

In recent years, with the continuous emergence of new network applications such as virtual reality and outdoor live broadcast, and the continuous improvement of users' requirements for network service quality assurance, mobile data traffic is growing rapidly. Such a huge traffic load increases the difficulty and overhead of deployment, subsequent operation and maintenance, and management of UPF (User Plane Function) of mobile operators. At the same time, in order to adapt to the rapid development of multi-access edge computing (MEC), the core network adopts the control plane and user plane separation (CUPS) architecture: that is, the core network control plane is deployed in a centralized manner, and a control plane SMF (Session Management Function, session management Function) manage multiple UPFs at the same time without affecting the performance of the core network; the user plane of the core network is deployed in a decentralized manner, and multiple UPFs can be flexibly distributed and deployed as needed. How to efficiently monitor and manage core network user plane traffic and quickly locate network faults has become an urgent technical problem to be solved.

In related technologies, SNMP technology is used to monitor and collect basic traffic information of network bottom devices. However, this measurement method collects fewer data types and coarser granularity. At the same time, it can only monitor the local status information of a certain UPF and cannot Monitoring global information such as the network status of the user plane of the entire core network has certain limitations.

Contents of the invention

Embodiments of the present invention provide a method and system for acquiring network status information, aiming to solve the problems existing in the above-mentioned background technology.

In order to solve the problems of the technologies described above, the present invention is achieved in that:

In a first aspect, an embodiment of the present invention provides a method for acquiring network state information, the method including:

The first user plane device parses the first GTP-U message, and collects first INT metadata of the first user plane device according to the INT indication issued by the control plane device in advance, and generates the first INT metadata including the INT indication and the first INT metadata. Two GTP-U packets are sent to the second user plane device;

The second user plane device parses the second GTP-U message, obtains the INT indication and the first INT metadata, and collects the second INT metadata of the second user plane device according to the INT indication, and combines the first INT metadata and the first INT metadata Two INT metadata, sent to the control plane device;

The control plane device receives the first INT metadata and the second INT metadata, and stores them in a preset database.

Optionally, before the step of the first user plane device receiving the first GTP-U message, the method further includes:

The control plane device determines the target user plane device according to whether each user plane device supports the INT function;

Determining the first user plane device and the second user plane device from the target user plane devices according to the network status monitoring requirement input by the user;

The control plane device sends a first deployment instruction and an INT instruction to the first user plane device, and sends a deployment instruction to the second user plane device to send a second deployment instruction;

After receiving the first deployment instruction, the first user plane device switches the working mode to the working mode matching the first deployment instruction, and updates the network monitoring table of the first user plane device;

After receiving the second deployment instruction, the second user plane device switches the working mode to the working mode matching the second deployment instruction, and updates the network monitoring table of the second user plane device.

Optionally, the step of generating the second GTP-U message including the INT indication and the first INT metadata includes:

Obtain the service flow data packet and the tunnel endpoint identifier in the first GTP-U message;

According to the tunnel endpoint identifier, determine whether the service flow data packet needs to add an INT header;

In the case of determining that the service flow data packet needs to add an INT header, determine the size relationship between the target storage space occupied by the INT header and the first INT metadata and the preset storage space threshold;

When the target storage space is less than or equal to the storage space threshold, insert the first INT metadata and INT indication into the first GTP-U packet, and encapsulate them together with the service flow data packet to generate the second GTP-U packet.

Optionally, when the target storage space is greater than the storage space threshold, the method further includes:

Forwarding the first GTP-U message directly to the second user plane device, inserting the first INT metadata into the empty GTP-U message, and updating the flag bit of the INT header to generate the third GTP-U message text; wherein, the third GTP-U message does not contain service traffic data packets, or

directly forward the first GTP-U packet to the second user plane device, generate an event report, and send the event report to the control plane device.

Optionally, after the step of sending the first INT metadata and the second INT metadata to the control plane device, the method further includes:

The second user plane device encapsulates the service flow data packet in the second GTP-U message into a fourth GTP-U message, and sends it to the target edge server;

The target edge server executes corresponding service tasks according to the fourth GTP-U message.

Optionally, the method further includes: sending the first INT metadata and the second INT metadata to the control plane device through the first thread, and simultaneously sending the fourth GTP-U message to the target edge server through the second thread .

Optionally, the method also includes:

Responding to the network status analysis requirement input by the user, extracting information matching the network status analysis requirement from a preset database, and performing an analysis of device-level network status parameters; and/or

In response to the network status analysis requirement input by the user, extract the information matching the network status analysis command from the preset database, and analyze the network status parameters at the data flow level; wherein, the device level network status parameters include at least CPU load, data flow Level network status parameters include at least network delay.

The second aspect of the embodiment of the present invention proposes a network status information acquisition system, the system includes:

The first collection module is used for the first user plane device to parse the first GTP-U message, and collect the first INT metadata of the first user plane device according to the INT instruction issued by the control plane device in advance, and generate the first INT metadata including the INT instruction and The second GTP-U message of the first INT metadata is sent to the second user plane device;

The second collection module is used for the second user plane device to parse the second GTP-U message, obtain the INT indication and the first INT metadata, and collect the second INT metadata of the second user plane device according to the INT indication, and send The first INT metadata and the second INT metadata are sent to the control plane device;

The data storage module is used for the control plane device to receive the first INT metadata and the second INT metadata and store them in a preset database.

Optionally, the system also includes a deployment module, and the deployment module includes:

The attribute acquisition sub-module is used for the control plane device to determine the target user plane device according to whether each user plane device supports the INT function;

The device screening sub-module is configured to determine the first user plane device and the second user plane device from the target user plane devices according to the network status monitoring requirements input by the user;

The instruction sending submodule is used for the control plane device to send the first deployment instruction and the INT instruction to the first user plane device, and send the deployment instruction to the second user plane device to send the second deployment instruction;

The first execution submodule is configured to switch the working mode to the working mode matching the first deployment instruction after the first user plane device receives the first deployment instruction, and update the network monitoring table of the first user plane device;

The second execution submodule is configured to switch the working mode to the working mode matching the second deployment instruction after the second user plane device receives the second deployment instruction, and update the network monitoring table of the second user plane device.

Optionally, the first collection module includes:

The identification acquisition submodule is used to acquire the service flow data packet and the tunnel endpoint identifier in the first GTP-U message;

The first judging submodule is used to determine whether the service flow data packet needs to add an INT header according to the tunnel endpoint identifier;

The second judging submodule is used to determine the size relationship between the INT header and the target storage space occupied by the first INT metadata and the preset storage space threshold when it is determined that the service flow data packet needs to add an INT header;

The message generation submodule is used to insert the first INT metadata and INT indication into the first GTP-U message when the target storage space is less than or equal to the storage space threshold, and encapsulate them together with the service flow data packet to generate The second GTP-U packet.

The third aspect of the embodiment of the present invention provides an electronic device, including a processor, a communication interface, a memory, and a communication bus, wherein the processor, the communication interface, and the memory complete communication with each other through the communication bus;

memory for storing computer programs;

The processor is configured to implement the method steps provided in the first aspect of the embodiments of the present invention when executing the program stored in the memory.

The fourth aspect of the embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the method as proposed in the first aspect of the embodiment of the present invention is implemented.

The embodiment of the present invention has the following advantages: firstly, the first user plane device parses the first GTP-U message, and collects the first INT metadata of the first user plane device according to the INT instruction issued by the control plane device in advance, and generates the first INT metadata including The second GTP-U packet of the INT indication and the first INT metadata is sent to the second user plane device, and then the second user plane device parses the second GTP-U message to obtain the INT indication and the first INT element Data, and collect the second INT metadata of the second user plane device according to the INT instruction, and send the first INT metadata and the second INT metadata to the control plane device, and finally, the control plane device receives the first INT metadata and second INT metadata, and stored in the default database. In this application, by collecting INT metadata of each user plane device, the application of in-band network telemetry in the core network is realized, and based on the INT metadata, it is possible to realize high-precision, multi-type network status information perception of service traffic.

In some embodiments of the present application, the present invention has good compatibility, so that the user plane equipment that cannot support the technology of the present invention can also correctly forward the GTP-U message carrying the INT metadata.

In some embodiments of the present application, during the process of collecting INT metadata, the forwarding of service traffic will not be affected, that is, the user's requirement for service traffic transmission speed can be guaranteed.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

FIG. 1 is a topological structure diagram of a core network user plane device in an embodiment of the present invention;

FIG. 2 is a flow chart of the steps of a method for obtaining network state information in an embodiment of the present invention;

Fig. 3 is a GTP-U message format diagram with INT information in the embodiment of the present invention;

Fig. 4 is a block diagram of a system for acquiring network state information in an embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

In traditional traffic monitoring methods, operators often use SNMP (Simple Network Management Protocol, Simple Network Management Protocol) technology to monitor and collect basic traffic information of network underlying devices, such as the number of data packets received and the number of bytes. However, this measurement method has certain limitations. For example, the collected data types are less and the granularity is coarser. At the same time, it can only monitor the local status information of a certain UPF (User Plane Function, User Plane Function) and cannot monitor the entire core. Global information such as the network status of the network user plane. This greatly limits the realization of operator network fault location and fine-grained scheduling of each user's session traffic.

The introduction of In-band Network Telemetry (INT) technology provides a framework for a new network measurement method for network status awareness. In-band network telemetry is a framework for the network data plane to collect and report network status without network control plane intervention. In this framework, its main data packet processing flow is: 1. When a common data message arrives at the first node of the in-band network telemetry system, the in-band network telemetry module inserts an INT header into the corresponding message through a certain sampling method 2. When the message is forwarded to the intermediate node, the corresponding device matches the INT header and inserts the relevant telemetry information; 3. When the message is forwarded to the last hop of the telemetry system, the corresponding device matches the INT header and inserts The last telemetry information, and then extract all telemetry information and send it to the telemetry server; 4. The telemetry server parses and extracts the telemetry information sent by each node, and reports it to the upper-layer application for processing. Applying INT technology to the user plane of the core network can provide effective support for core network fault monitoring, traffic scheduling, traffic visualization and other related functions. However, the current in-band network telemetry implementation solutions focus on the IP layer and cannot be directly applied to the UPF of the core network.

Therefore, in view of the current situation that the UPF of the core network does not support INT technology and the need for finer-grained and higher-precision network status information perception of the state of user plane traffic inside the core network, the inventor proposed the technical concept of this application: UPF The device adds INT data information and INT header to the GTP-U packet that carries the actual service traffic of the user plane of the core network, and other related UPF devices collect and update their own relevant INT metadata according to the instructions of the added INT header. Corresponds to the INT data information of the GTP-U packet. Finally, through the collection and analysis of all INT metadata, the in-band network telemetry of the user plane of the entire core network is realized, providing a finer-grained and higher-precision network status information perception function.

The topological diagram of the user plane equipment of the core network as shown in Figure 1 includes: 5G RAN (Radio Access Network, radio access network). It can be understood that the 5G RAN can be understood as base station equipment, which is used to receive the information sent by the user through the mobile terminal. The service flow data packet, I-UPF (Intermediate UPF, relay UPF), is used to transmit the uplink and downlink service flow data packets between 5G RAN and A-UPF. A-UPF (Anchor UPF, Anchor UPF) is used to send the user's service flow data packet to the corresponding edge server DN, and receive the feedback data generated by the edge server DN according to the service data. The existing method can only monitor the status information of a certain UPF. As an example, the existing method can only monitor the received number and the number of bytes of the I-UPF data packets, but cannot simultaneously monitor the status information of the A UPF. -Monitor the network status information of equipment such as UPF and 5G RAN. Moreover, when the entire network fails, network fault location cannot be performed.

Before implementing the method steps of this application, it is first necessary to perform functional configuration on the user plane equipment in the core network, specifically including:

The control plane device determines the target user plane device according to whether each user plane device supports the INT function;

Determining the first user plane device and the second user plane device from the target user plane devices according to the network status monitoring requirement input by the user;

The control plane device sends a first deployment instruction and an INT instruction to the first user plane device, and sends a deployment instruction to the second user plane device to send a second deployment instruction;

After receiving the first deployment instruction, the first user plane device switches the working mode to the working mode matching the first deployment instruction, and updates the network monitoring table of the first user plane device;

After receiving the second deployment instruction, the second user plane device switches the working mode to the working mode matching the second deployment instruction, and updates the network monitoring table of the second user plane device.

In this embodiment, as shown in Figure 1, a control plane device is added to the existing topological structure of the core network user plane device, the control plane device may be an INT data collection server, and the user plane device may be an A-UPF , 5G RAN, I-UPF and other equipment, the solid line bidirectional arrows in Figure 1 represent the data transmission process of GTP-U packets containing service traffic data packets, and the dotted arrows represent user plane equipment and control plane equipment data interaction process. The INT data collection server collects the device attributes of each user plane device in the core network. The device attribute refers to whether the A-UPF, 5G RAN, and I-UPF have the ability to support the INT function, that is, whether the software and hardware of the user plane device can achieve The requirements for installing the INT function, for the user plane device, it must first support the installation of the INT function before continuing to assign the INT node function to it, that is, the user plane device that supports the INT function is the target user plane device. An INT domain contains three types of INT function nodes, namely INT Source function node, INT Sink function node and INT Transit Hop function node. Among them, the INTSource function node and the INT Sink function node are the starting point and end point of the telemetry line. The INT Source function node is responsible for pointing out the flow of information to be collected and the information to be collected. The INT Sink function node is responsible for sorting out the received information and reporting it to INT. Data collection server; INT Transit Hop function nodes can be considered as all devices on the line that support INT telemetry. If the user plane device supports the INT function, its default enabled working mode is the INT Transit Hop function node in the INT node function, and the first user plane device indicates that the INT node function enabled by the user plane device is INT Source A function node, the second user plane device means that the INT node function enabled by the user plane device is an INTSink function node.

Therefore, after the target user plane device is determined, the function of the user plane device can be set according to the user's network status monitoring requirements, and a user plane device and a second user plane device are selected from the target user plane devices. As an example, If the user's network information monitoring requirement starts from 5G RAN and ends at A-UPF, it can be determined that I-UPF enables the INT Transit Hop function node working mode, that is, the first user plane device is 5G RAN, and other The INTSource function node working mode is enabled, and the second user plane device is A-UPF, which needs to enable the INT Sink function node working mode, and if there is an I-UPF, the I-UPF enables the INT Transit Hop function node working mode. If the user's network information monitoring requirement starts from I-UPF and ends with A-UPF, then it can be determined that the first user plane device is I-UPF, which needs to enable the INT Source function node working mode, and the second user plane device is A-UPF needs to enable the INT Sink function node working mode, that is, an INT domain may include multiple INT Transit Hop function nodes, or may not include INT Transit Hop function nodes, but must include a first user plane device (INT Source function node) and a second user plane device (INT Sink function node).

After determining the target node and the corresponding function of the target node, the control plane device sends deployment instructions and INT instructions to each target user plane device, and sends a first deployment instruction to the first user plane device, and the first deployment instruction is used to deploy the user The surface device switches from the default INT Transit Hop function node working mode to the INT Source function node working mode, and the second deployment instruction is used to switch the target device from the default INT Transit Hop function node working mode to the INT Sink function node working mode, INT The indication refers to the type and quantity of network status information that the user plane device is expected to collect. Generally, it can be divided into two levels of data, the device level and the data flow level. The data at the device level includes: UPF number, CPU utilization, etc. Data, data flow level data include: Qos Flow Id, ingress port timestamp, egress port timestamp, buffer queue length, processing delay, current packet count, current byte count and other data, that is, the INT instruction specifies the data to be collected Those of the target INT element, and the size of the corresponding data volume. The INT indication only needs to be delivered to the first user plane device.

After the first user plane device receives the first deployment instruction, switch the current working mode from the default INTTransit Hop function node working mode to the INT Source function node working mode, and collect the network status information of the target type according to the INT instruction, and Updating the network monitoring table of the first user plane device, after the second user plane device receives the second deployment instruction, switching the current working mode from the default INT Transit Hop function node working mode to the INT Sink function node working mode, and The network monitoring table of the second user plane device is updated. After each user plane device completes switching of working modes, the deployment task is completed. And the user can update the network status monitoring requirement, so as to implement the update of the network monitoring table of the user plane device.

After the deployment of the system is completed, the method for obtaining network status information of this application will be described below by taking the process of sending complete service flow data as an example, as shown in Figure 2, which shows a network status of this application Schematic flow chart of the information acquisition method.

S201: The first user plane device parses the first GTP-U message, and collects first INT metadata of the first user plane device according to the INT instruction sent by the control plane device in advance, and generates the INT instruction and the first INT metadata The second GTP-U message is sent to the second user plane device.

In this embodiment, first, the user sends the service request data through the mobile terminal, and the 5G RAN receives the data packet of the service request data, prepares to encapsulate the first GTP-U message, and sends the first GTP-U message To the first user plane device, generating the second GTP-U message including the INT indication and the first INT metadata, the specific steps may be:

S201-1: Obtain the service flow data packet and the tunnel endpoint identifier in the first GTP-U packet.

In this embodiment, the first user plane device is I-UPF as an example. After receiving the first GTP-U message, the I-UPF first records information such as the time stamp of the inbound port and the length of the waiting queue, and then A GTP-U message is analyzed, and the Qos (Quality of Service, quality of service) Flow Id or TEID (Tunnel Endpoint Identifier, tunnel end point identifier) of the GTP-U Header part in the first GTP-U message can be obtained after the analysis ).

S201-2: Determine whether an INT header needs to be added to the service flow data packet according to the tunnel endpoint identifier.

In this embodiment, according to the Qos Flow Id or the tunnel endpoint identifier, the preset stored monitoring table is consulted, and the stored monitoring table is a hash table, which stores the information of the service flow for which the INT should be enabled for network state information perception. Qos Flow Id or tunnel endpoint identifier, if the Qos Flow Id or tunnel endpoint identifier obtained by the first GTP-U message analysis can be queried in the stored monitoring table, then it is determined that an INT header needs to be added to the service flow data packet, On the contrary, if the Qos Flow Id obtained by the first GTP-U message analysis or the tunnel endpoint identifier cannot be queried in the stored monitoring table, then it is determined that there is no need to add the INT header in the service flow data packet, and follow the normal GTP-U U packets are forwarded in the forwarding mode.

In a feasible implementation, in addition to judging whether the INT header needs to be added according to the tunnel endpoint identifier, it is also possible to judge whether the service flow data packet needs to be added according to the monitoring requirements of other users such as qos flow id and pdu session id Add INT header.

In a feasible implementation manner, as shown in Figure 3, the format of the INT data packet suitable for the perception of the network status information of the user plane of the core network is shown; wherein: the first part is a 4-bit Ver field indicating the version of the INT data packet, which is fixed at 2 . The second part is the 1-bit flag D. If it is set to 1, it means that the message needs to be discarded after extracting the INT information. The third part is a 1-bit flag E. If it is set to 1, it means that the MAX Hop Count (the maximum number of hops in the network) has been reached. The fourth part is the 1-bit flag M. If it is set to 1, it means that the message has exceeded the MTU setting. The fifth part is 12bit Reserved, not used. The sixth part is 5bit Hop ML, which records the number of bytes of INT metadata inserted in each hop, with 4Byte as a unit. The seventh part is 8bit RemainingHopCnt, which records how many remaining hops can be inserted into INT information. The eighth part is 16bit Instruction Bitmap, where each bit represents an INT metadata type, which indicates the type and order of INT metadata that needs to be filled in the INT Metadata Stack (metadata stack) for each hop, for example : UPF number, Qos Flow Id, ingress port timestamp, egress port timestamp, cache queue length, processing delay, CPU utilization, current packet count, current byte count, etc.

The ninth part is 16bit Domain Specific ID, which records the region ID of this network status information perception. The main purpose is to realize different INT metadata insertion for different regions, that is, the Instruction Bitmap is only valid in the region with a specific ID.

The tenth part is the remaining part INT Metadata Stack (metadata stack), which stores the INT metadata collected on each UPF, and its order is consistent with that of the Instruction Bitmap. The size of INT metadata inserted by each UPF should be a multiple of 4Byte.

Specifically, the corresponding data is mapped in each part of the INT data message. For example, the data mapped in the eighth part is an INT indication, which is used to guide subsequent user plane devices to collect target INT metadata. The tenth part mapped The data is the first INT metadata collected by the first user plane device according to the INT instruction.

S201-3: In a case where it is determined that an INT header needs to be added to the service flow data packet, determine a size relationship between the target storage space occupied by the INT header and the first INT metadata and the preset storage space threshold.

S201-4: When the target storage space is less than or equal to the storage space threshold, insert the first INT metadata and the INT indication into the first GTP-U message, and generate a second GTP-U message;

In the implementation manners of S201-3 to S201-4, when it is determined that the service flow data packet needs to add an INT header;

The INT indication sent by the control plane device is added to the INT header, thereby generating a new INT header. Determining the storage space threshold of the service flow data packet means determining the MTU (Maximum Transmission Unit) corresponding to the service flow data packet. That is, to judge whether the business traffic data packet has enough space to store INT metadata and INT header, it can be judged according to the INT indicator field in the INT header, because the INT indicator field specifies the data type of the collected INT metadata, and the INT The data size corresponding to the metadata data type is fixed. Therefore, the data size of the first INT metadata that needs to be collected can be calculated, that is, the size of the target storage space occupied by the first INT metadata, and the storage capacity of the service traffic data packets. The space threshold is equal to the value of the storage space corresponding to the MTU of the service flow data packet minus the value of the storage space occupied by the service flow data. If the target storage space is less than or equal to the storage space threshold, it is determined that the service flow data packet has enough space to store INT metadata.

In the case where the business traffic data packet has enough space to store INT metadata;

Then, according to the corresponding instruction content of the INT instruction field (specifically, the Instruction Bitmap field), the first user plane device performs target INT metadata collection, thereby obtaining the first INT metadata, the first INT metadata can be UPF ID, Qos One or more of Flow Id, outbound timestamp, inbound timestamp, processing delay, queue length, and CPU load. After the first INT metadata collection is completed, as an example, in the message shown in Figure 2, first add the INT Data Container to the GTP-UExtension Header to carry the INT header and the first INT metadata, as A new GTP-U Extension Header, and then insert the first INT metadata and INT header into the INT Data Container in the order corresponding to the INT indication, where the GTP-U ExtensionHeader Type to which the INT Data Container belongs should be 0x8F. Finally, the first user plane device encapsulates the GTP-U message with the first INT metadata and INT indication, then encapsulates the UDP and IP headers, updates the length and checksum, and updates the Message length (data length) of the GTP-U message ) this parameter, in the process of encapsulating the UDP and IP headers, since the INT header and the first INT metadata have been added, the Total Length (message length) of the UDP header and the IP header needs to be updated to generate the second GTP- U message.

In the case where the business traffic data packet does not have enough space to store INT metadata;

S201-5: directly forward the first GTP-U message to the second user plane device, insert the first INT metadata into the empty GTP-U message, and update the flag bit of the INT header to generate the third GTP-U message; or

directly forward the first GTP-U packet to the second user plane device, generate an event report, and send the event report to the control plane device.

In this case, an empty GTP-U message can be sent separately. Its UDP and IP layer header format is the same as that of the original GTP-U message, but the GTP-U payload is empty, and it is also in the GTP-U Add INTData Container to the Extension Header, except that the M flag position of the INT Header is 1, and the D flag position is 1, to indicate that the message is a separate INT message; or adopt an ignore strategy, that is, do not add INT to the datagram information, but report the event to the INT collection server. As an example, if the first user plane device parses the first GTP-U message (numbered as A), it is found that there is not enough storage space in A to store the collected first INT metadata of the first user plane device , then A is encapsulated according to the encapsulation method of ordinary packets, and then directly forwarded to the next user plane device, and then a GTP-U packet (numbered as B) is generated separately, and the UDP and IP layer header formats of B are the same as those of A , but there is no business traffic data in the Data field of B. It can be understood in this way, that is, B is a duplicate message of A, but the part of business traffic data is removed, and then INT Data Container is added to the GTP-UExtension Header of B. Then insert the first INT metadata and INT header into the INT Data Container in the order corresponding to the INT indication, and set the second part D flag and the fourth part M flag of the INT data message to 1 to indicate the message It is a separate INT message and discarded after extraction. Then perform encapsulation to generate a third GTP-U message (numbered B), and send it to the next user plane device.

Or, if the first user plane device parses the first GTP-U message (numbered as A) and finds that there is not enough storage space in A to store the collected first INT metadata of the first user plane device, then Take an ignore strategy, that is, do not add the first INT metadata of the first user plane device to the datagram, but send an event report to the control plane device, and the content of the event report can be: the first user plane device cannot perform the first INT metadata collection. And forward it according to the normal GTP-U message forwarding mode.

In the first user plane device, because the INT technology is implemented in the Extension Header of the original GTP-U header, and based on the INT technology, a high-precision, real-time, multi-type network of Qos Flow level is realized in the first user plane device Status data collection provides a data basis for subsequent fine-grained network status analysis of user plane devices.

The above embodiment shows the implementation process when the first user plane device is I-UPF. The first user plane device can also be 5G RAN. Which device is the first user plane device depends on which device the user needs. It is determined by monitoring network status information, so the first user plane device is the initial user plane device. When the first user plane device is 5G RAN, it is first necessary to encapsulate the service traffic data packet into the first GTP-U report text, and then parse the first GTP-U message and collect the first INT metadata, encapsulate and generate a second GTP-U message, and send it to the next user plane device.

And when it is determined that the service flow data packet does not need to add an INT header, the first GTP-U message is directly encapsulated according to the encapsulation method of the ordinary message, and is directly forwarded to the The next user plane device.

After the first user plane device sends the generated second GTP-U message to the next user plane device, the next user plane device may be an intermediate user plane device, and the working mode of the intermediate user plane device is an INT Transit Hop function node , may also be the second user plane device, the working mode of the second user plane device is an INT Sink function node, or it may be a user plane device that does not support the INT function.

In the case that the next user plane device is a user plane device that does not support the INT function;

In this embodiment, the second GTP-U message is first parsed, and then the parsed second GTP-U message is directly encapsulated according to the encapsulation method of the ordinary message, and then encapsulated according to the encapsulation method of the ordinary GTP-U message. The forwarding method is forwarded to the next user plane device.

In the case that the working mode of the next user plane device is the INT Transit Hop function node;

In this embodiment, if the working mode of the user plane device is an INT Transit Hop function node, then the user plane device is an intermediate user plane device, firstly parses the second GTP-U message, and then judges the GTP-U message Whether the Extension Header has an INT Data Container, if there is no INT Data Container, the parsed second GTP-U message is encapsulated according to the encapsulation method of a normal message, and then directly forwarded to the next user plane device. If there is an INT Data Container (i.e. when GTP-U Extension Header Type=0x8F), then continue to judge whether the service flow data packet has enough space to store the INT metadata, and the judgment method and judgment execution result are the same as the above-mentioned embodiment , so no more details are given, and then a GTP-U message containing the INT metadata of the user plane device is generated. And send to the next user plane device, if the working mode of the next user plane device is the INT Transit Hop function node, then continue to execute the steps of this embodiment, collect the INT metadata of the next user plane device until the next user plane The working mode of the surface device is a sink function node.

In the case that the working mode of the next user plane device is a Sink function node, the method includes:

S202: The second user plane device parses the second GTP-U packet, obtains the INT indication and the first INT metadata, collects the second INT metadata of the second user plane device according to the INT indication, and stores the first INT metadata and the second INT metadata, sent to the control plane device.

In this embodiment, after the second user plane device receives the second GTP-U message, taking the second GTP-U message directly sent by the first user plane device as an example, first record the in-port timestamp and wait for information such as queue length, then judge whether the Extension Header of the second GTP-U message after parsing has INT Data Container, promptly judge GTP-U Extension Header Type=0x8F, under the situation of judging through, enter to the second In the GTP-U packet parsing process, the second user plane device parses the INT header according to the corresponding INT packet format, and obtains relevant information such as INT indication and remaining hop count. Specifically, according to the corresponding instruction content of the INT instruction field (specifically, the Instruction Bitmap field), the second user plane device collects the target INT metadata, so as to obtain the second INT metadata, and the second INT metadata can be UPF ID, One or more of Qos Flow Id, outbound timestamp, inbound timestamp, processing delay, queue length, and CPU load. After the collection of the second INT metadata is completed, the second INT metadata is sequentially inserted into the INT Data Container in the GTP-U Extension Header according to the order corresponding to the INT indication, and then all the INT metadata are transferred from the GTP-U Extension Header Extracted from at least the first INT metadata and the second INT metadata. If there is an intermediate user plane device, it also includes the INT metadata of the intermediate user plane device. When the extraction work is completed, all the extracted INT The metadata and INT header are then sent to the control plane device.

In a feasible implementation manner, in order to ensure the transmission efficiency of the service flow data packet, it is necessary to simultaneously perform the sending process of the INT metadata and the service flow data packet, and the specific steps include:

Send the first INT metadata and the second INT metadata to the control plane device through the first thread, and simultaneously send the fourth GTP-U message to the target edge server through the second thread.

In this embodiment, the INT metadata is sent to the control plane device in a multi-threaded concurrent manner. Multi-threaded concurrency may mean that some threads send the INT metadata and INT header to the control plane device, and another part of the threads sends the business The traffic data packets are normally encapsulated and sent, and then sent to the edge server, that is, the transmission of INT metadata and INT headers and the forwarding of business traffic data packets are carried out at the same time, so as to avoid sending successively and reduce the sending efficiency of business traffic data packets.

S203: The control plane device receives the first INT metadata and the second INT metadata, and stores them in a preset database.

In this embodiment, after the control plane device receives the INT metadata information sent by each second user plane device, it also stores the original data information in the INT information database in a multi-threaded manner, and simultaneously passes the The INT data processing module parses the INT metadata, and then stores the INT metadata in the INT information database in a way that users can directly read. When storing, different types of data can be stored in different INT information data sub-databases according to specific data types, or can be stored according to the type of user plane equipment.

In order not to affect the normal message forwarding in the second user plane device, at the same time, the UPF needs to encapsulate and decapsulate the GTP-U message of the original service flow according to the rules, and forward it, which specifically includes:

The second user plane device encapsulates the service flow data packet in the second GTP-U message into a fourth GTP-U message, and sends it to the target edge server;

The target edge server executes corresponding service tasks according to the fourth GTP-U message.

In this embodiment, after the second user plane device sends the collected INT metadata of all user plane devices to the control plane device, the original service flow data packet is encapsulated according to preset rules, and encapsulated into a fourth In the GTP-U message, the fourth GTP-U message is encapsulated by the second user plane device, and does not contain INT metadata, but only contains service traffic data packets. If the second user plane device is A-UPF, the fourth GTP-U message is forwarded to the target edge server through the second user plane device, and the target edge server may be an edge server supporting a service request corresponding to a service flow data packet The edge server with the closest physical location. When the target edge server receives the fourth GTP-U message, it parses it, extracts the service flow data packet therein, then executes the corresponding service according to the data in the service flow data packet, generates the corresponding service result, and then Return the business results to the mobile terminal according to the original delivery process, so that the user can obtain the result of this business task. As an example, the business traffic data packet sent by the user can be a processing request for a certain picture, and then the business traffic data packet Encapsulate into a GTP-U message and enter the core network, and then insert the INT metadata of the user plane device during the transmission of the GTP-U message in the core network user plane device for the network status between the core network user plane devices Analysis, when the constantly updated GTP-U message is sent to the INT Sink function node, the collected INT metadata is extracted, and the service flow data packet is sent to the edge server, and then the edge server receives the service flow data packet, Process the picture and send the processed picture to the user. Thus, the collection of INT metadata is realized without affecting the user's business use request.

During the operation of the whole system, some network parameters are highly concerned, so they need to be paid attention to. There is a situation where the waiting queue is too long, and some network parameters have relatively low attention, so there is no need to pay attention to them all the time, and the collection frequency of these parameters and whether they need to be collected are adjusted according to the user's setting requirements. Specifically can include:

The control plane device updates the deployment instructions of the first user plane device and the second user plane device according to the network status monitoring requirements input by the user;

The network monitoring table of each user plane device is adjusted according to the updated deployment instructions of the first user plane device and the second user plane device.

In this embodiment, the network status information of the user plane equipment that the user needs to monitor can be adjusted in real time. As an example, the user plane equipment that the user needs to monitor for the first time starts from 5G RAN and ends with A-UPF , in this link, the 5G RAN acts as an INT SOUSE node, the data collection cycle is once every 0.1s, and the A-UPF enables the function of the INT Sink function node, and in the subsequent monitoring process, if The user plane equipment that needs to be monitored starts from I-UPF, and then ends with A-UPF. The data collection cycle is once every 0.2s. In this link, I-UPF acts as an INT SOUSE node. A-UPF UPF enables the function of the INT Sink function node. Since the data collection cycle and the user plane equipment to be detected have changed, it is necessary to adjust the INT function node and collection frequency of the user plane equipment, that is, it is necessary to update the deployment instructions of the first user plane equipment and the second user plane equipment, Then send it again.

After the collection of INT metadata is completed, fine-grained network status analysis can be performed based on the collected INT metadata. Specific methods include:

Responding to the network status analysis requirement input by the user, extracting information matching the network status analysis requirement from a preset database, and performing an analysis of device-level network status parameters; and/or

In response to the network status analysis requirement input by the user, extract the information matching the network status analysis command from the preset database, and analyze the network status parameters at the data flow level; wherein, the device level network status parameters include at least CPU load, data flow Level network status parameters include at least network delay.

In this embodiment, when the user needs to analyze the network status of the user plane device, the network status analysis requirement input by the user, the network status analysis requirement may include the serial number of the user plane device, the type of network status data, etc., as an example , if the user wants to know the delay information between 5G RAN and A-UPF, the network status analysis command input by the user must at least include the equipment numbers of A-UPF and 5G RAN, and the type of network status data is delay After receiving the network status analysis command, the control plane device uses the device number as an index to search the preset database to obtain the port timestamp when the GTP-U message reaches the 5G RAN and A-UPF, and then, according to the 5G RAN and A-UPF The port timestamp of A-UPF can determine the delay information between 5G RAN and A-UPF, so as to realize the analysis of network status parameters at the data flow level. The difference between the stamps determines the processing delay of the 5G RAN. Similarly, based on the above process, the analysis of the analysis status of the device-level network status parameters such as the CPU utilization rate can also be realized. It can be understood that which level and which network status information the user needs to analyze is adjusted according to the user's usage requirements, which is not limited in this application.

In a feasible implementation manner, the present invention further provides a core network user plane network state information perception system to implement the steps in the first aspect of the present application. The system is deployed on the core network user plane equipment (such as base station or UPF). By adding the INT Data Container to the GTP-U Extension Header, and extracting this information from the PSA or the designated UPF, the system specifically includes:

INT data generation module. This module is located on the user plane equipment of the core network, such as a base station or UPF. The main functions are to collect INT metadata, generate INT Header, and add corresponding INT metadata and INT Header to the Extension Header of the GTP-U header.

INT data extraction module. This module is located on the user plane equipment of the core network, such as a base station or UPF. The main function is to extract the INT Data Container in the GTP-U message and send it to the INT data collection server in a multi-threaded concurrent manner.

INT data collection server, this functional module is the control module of the whole system and should be deployed on a specific server. The main functions are to control whether the core network user plane device enables the network status information perception function, adjust the sampling frequency, modify the INT function role of UPF, update the monitoring table of each UPF, store and analyze INT metadata, and update the core network user plane network status Information report (for example: the time delay of a PDU session between UPFs in different time periods, etc.). The communication between the INT data collection server and the INT data extraction module adopts a multi-threaded concurrent method.

The embodiment of the present invention also provides a system for obtaining network status information. Referring to FIG. 4 , it shows a functional module diagram of the first aspect of an embodiment of a system for obtaining network status information according to the present invention. The system includes:

The first collection module 401 is used for the first user plane device to parse the first GTP-U message, and collect the first INT metadata of the first user plane device according to the INT instruction sent by the control plane device in advance, and generate the INT instruction and the second GTP-U message of the first INT metadata, and send it to the second user plane device;

The second collection module 402 is configured for the second user plane device to parse the second GTP-U message, obtain the INT indication and the first INT metadata, and collect the second INT metadata of the second user plane device according to the INT indication, and sending the first INT metadata and the second INT metadata to the control plane device;

The data storage module 403 is configured for the control plane device to receive the first INT metadata and the second INT metadata and store them in a preset database.

In a feasible implementation manner, the system further includes a deployment module, and the deployment module includes:

The attribute acquisition sub-module is used for the control plane device to determine the target user plane device according to whether each user plane device supports the INT function;

The device screening sub-module is configured to determine the first user plane device and the second user plane device from the target user plane devices according to the network status monitoring requirements input by the user;

The instruction sending submodule is used for the control plane device to send the first deployment instruction and the INT instruction to the first user plane device, and send the deployment instruction to the second user plane device to send the second deployment instruction;

The first execution submodule is configured to switch the working mode to the working mode matching the first deployment instruction after the first user plane device receives the first deployment instruction, and update the network monitoring table of the first user plane device;

The second execution submodule is configured to switch the working mode to the working mode matching the second deployment instruction after the second user plane device receives the second deployment instruction, and update the network monitoring table of the second user plane device.

In a feasible implementation manner, the second collection module includes:

The multi-thread concurrency sub-module is configured to send the first INT metadata to the control plane device through the first thread, and simultaneously send the second INT metadata to the control plane device through the second thread.

In a feasible implementation manner, the first collection module includes:

The identification acquisition submodule is used to acquire the service flow data packet and the tunnel endpoint identifier in the first GTP-U message;

The first judging submodule is used to determine whether the service flow data packet needs to add an INT header according to the tunnel endpoint identifier;

The second judging submodule is used to determine the size relationship between the INT header and the target storage space occupied by the first INT metadata and the preset storage space threshold when it is determined that the service flow data packet needs to add an INT header;

The message generation submodule is used to insert the first INT metadata and INT indication into the first GTP-U message when the target storage space is less than or equal to the storage space threshold, and encapsulate them together with the service flow data packet to generate The second GTP-U packet.

In a feasible implementation manner, the first acquisition module further includes:

The event report generation module directly forwards the first GTP-U message to the second user plane device, inserts the first INT metadata into the empty GTP-U message, and updates the flag bit of the INT header to generate the first Three GTP-U messages; wherein, the third GTP-U message does not contain service traffic data packets; or

The first GTP-U message is directly forwarded, an event report is generated, and the event report is sent to the control plane device.

In a feasible implementation manner, the system also includes:

The forwarding module is used for the second user plane device to encapsulate the service flow data packet in the second GTP-U message into a fourth GTP-U message, and send it to the target edge server;

The execution module is used for the target edge server to execute corresponding business tasks according to the fourth GTP-U message.

In a feasible implementation manner, the system also includes:

The first analysis module is configured to respond to the network status analysis requirement input by the user, extract information matching the network status analysis requirement from the preset database, and analyze the device-level network status parameters; and/or

The second analysis module is used to respond to the network status analysis requirement input by the user, extract the information matching the network status analysis instruction from the preset database, and analyze the network status parameters at the data flow level; wherein, the device level network status parameters It includes at least CPU load, and the data flow level network status parameter includes at least network delay.

Based on the same inventive concept, an embodiment of the present application also proposes an electronic device, which includes:

At least one processor; and, a memory connected in communication with the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor, so that the at least one processor can perform the present application The method for acquiring network state information of the embodiment.

In addition, to achieve the above purpose, the embodiments of the present application also provide a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the network state information acquisition method of the embodiment of the present application is implemented.

Those skilled in the art should understand that the embodiments of the present invention may be provided as methods, devices, or computer program products. Accordingly, embodiments of the invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, embodiments of the invention may take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) having computer-usable program code embodied therein.

Embodiments of the present invention are described with reference to flowcharts and/or block diagrams of methods, terminal devices (apparatus), and computer program products according to embodiments of the present invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor or processor of other programmable data processing terminal equipment to produce a machine such that instructions executed by the computer or processor of other programmable data processing terminal equipment Produce means for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the The instruction means implements the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded into a computer or other programmable data processing terminal equipment, so that a series of operational steps are performed on the computer or other programmable terminal equipment to produce computer-implemented processing, thereby The instructions executed above provide steps for implementing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

Finally, it should also be noted that in this text, relational terms such as first and second etc. are only used to distinguish one entity or operation from another, and do not necessarily require or imply that these entities or operations, any such actual relationship or order exists. "And/or" means that either one of the two can be selected, or both can be selected. Furthermore, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or terminal equipment comprising a set of elements includes not only those elements, but also includes elements not expressly listed. other elements identified, or also include elements inherent in such a process, method, article, or end-equipment. Without further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of additional identical elements in the process, method, article or terminal device comprising said element.

The method and system for obtaining network status information provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention. The description of the above embodiments is only used to help understand the present invention. The method of the invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and scope of application. In summary, the content of this specification should not be understood To limit the present invention.

Claims (10)

1. A method for acquiring network state information is characterized in that the method comprises the following steps:

the first user plane equipment analyzes the first GTP-U message, collects first INT metadata of the first user plane equipment according to INT indication issued by control plane equipment in advance, generates a second GTP-U message comprising the INT indication and the first INT metadata, and sends the second GTP-U message to second user plane equipment;

the second user plane equipment analyzes the second GTP-U message, acquires the INT indication and the first INT metadata, collects the second INT metadata of the second user plane equipment according to the INT indication, and sends the first INT metadata and the second INT metadata to control plane equipment;

and the control surface equipment receives the first INT metadata and the second INT metadata and stores the first INT metadata and the second INT metadata in a preset database.

2. The method of claim 1, wherein prior to the step of the first user plane device receiving the first GTP-U packet, the method further comprises:

the control plane equipment determines target user plane equipment according to whether each user plane equipment supports an INT function or not;

determining a first user plane device and a second user plane device from the target user plane device according to a network state monitoring requirement input by a user;

the control plane equipment sends a first deployment instruction and the INT instruction to the first user plane equipment, and sends a deployment instruction to the second user plane equipment to send a second deployment instruction;

after the first user plane equipment receives the first deployment instruction, the working mode is switched to the working mode matched with the first deployment instruction, and a network monitoring table of the first user plane equipment is updated;

and after the second user plane equipment receives the second deployment instruction, switching the working mode to the working mode matched with the second deployment instruction, and updating the network monitoring table of the second user plane equipment.

3. The method of claim 1, wherein generating a second GTP-U packet comprising the INT indication and the first INT metadata comprises:

acquiring a service flow data packet and a tunnel endpoint identifier in the first GTP-U message;

determining whether the service flow data packet needs to be added with an INT header according to the tunnel endpoint identifier;

determining the size relation between a target storage space occupied by the INT header and the first INT metadata and a preset storage space threshold under the condition that the INT header is determined to be required to be added to the service flow data packet;

and under the condition that the target storage space is smaller than or equal to the storage space threshold, inserting the first INT metadata and the INT indication into the first GTP-U message, and packaging the first INT metadata and the INT indication together with the service flow data packet to generate the second GTP-U message.

4. The method of claim 3, wherein if the target storage space is greater than the storage space threshold, the method further comprises:

directly forwarding the first GTP-U message to the second user plane equipment, inserting the first INT metadata into an empty GTP-U message, and updating a flag bit of an INT header to generate a third GTP-U message; wherein the third GTP-U message does not contain the service flow data packet, or

And directly forwarding the first GTP-U message to the second user plane equipment, generating an event report, and sending the event report to the control plane equipment.

5. The method of claim 3, wherein after the step of sending the first INT metadata and the second INT metadata to a control plane device, the method further comprises:

the second user plane equipment encapsulates the service flow data packet in the second GTP-U message into a fourth GTP-U message and sends the fourth GTP-U message to a target edge server;

and the target edge server executes a corresponding service task according to the fourth GTP-U message.

6. The method of claim 5, further comprising:

and sending the first INT metadata and the second INT metadata to the control plane equipment through a first thread, and sending the fourth GTP-U message to the target edge server through a second thread.

7. The method of claim 1, further comprising:

responding to a network state analysis requirement input by a user, extracting information matched with the network state analysis requirement from the preset database, and analyzing equipment-level network state parameters; and/or

Responding to a network state analysis requirement input by a user, extracting information matched with the network state analysis instruction from the preset database, and analyzing the data flow level network state parameters; the device-level network state parameters at least comprise CPU load, and the data stream-level network state parameters at least comprise network delay.

8. A network status information acquisition system, characterized in that the system comprises:

the first acquisition module is used for the first user plane equipment to analyze a first GTP-U message, collect first INT metadata of the first user plane equipment according to INT indication issued by the control plane equipment in advance, generate a second GTP-U message comprising the INT indication and the first INT metadata, and send the second GTP-U message to the second user plane equipment;

the second acquisition module is used for the second user plane equipment to analyze the second GTP-U message, obtain the INT indication and the first INT metadata, collect the second INT metadata of the second user plane equipment according to the INT indication and send the first INT metadata and the second INT metadata to the control plane equipment;

and the data storage module is used for receiving the first INT metadata and the second INT metadata by the control surface equipment and storing the first INT metadata and the second INT metadata in a preset database.

9. The system of claim 8, further comprising a deployment module, the deployment module comprising:

the attribute acquisition submodule is used for determining target user plane equipment by the control plane equipment according to whether each user plane equipment supports an INT function or not;

the device screening sub-module is used for determining first user plane equipment and second user plane equipment from the target user plane equipment according to network state monitoring requirements input by a user;

the instruction sending submodule is used for sending a first deployment instruction and the INT instruction to the first user plane equipment and sending a deployment instruction to the second user plane equipment to send a second deployment instruction by the control plane equipment;

the first execution sub-module is configured to, after receiving the first deployment instruction, switch a working mode to a working mode matching the first deployment instruction, and update a network monitoring table of the first user plane device;

and the second execution sub-module is configured to, after receiving the second deployment instruction, the second user plane device switches the working mode to the working mode matched with the second deployment instruction, and updates the network monitoring table of the second user plane device.

10. The system of claim 8, wherein the first acquisition module comprises:

the identification acquisition submodule is used for acquiring a service flow data packet and a tunnel endpoint identifier in the first GTP-U message;

a first judging submodule, configured to determine whether the service traffic data packet needs to add an INT header according to the tunnel endpoint identifier;

the second judgment sub-module is used for determining the size relation between a target storage space occupied by the INT header and the first INT metadata and a preset storage space threshold under the condition that the INT header needs to be added to the service flow data packet;

and the message generation sub-module is used for inserting the first INT metadata and the INT indication into the first GTP-U message under the condition that the target storage space is smaller than or equal to the storage space threshold, and packaging the first INT metadata and the INT indication together with the service flow data packet to generate the second GTP-U message.

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