Packet loss method and device, communication equipment, storage medium and computer program product

Abstract

The invention relates to a packet loss method and device, communication equipment, a storage medium and a computer program product. The method comprises the following steps that: under the condition that the current network congestion condition meets a first packet loss triggering condition, a user plane function (UPF) network element selects a protocol data unit (PDU) from a first protocol data unit set (PDU) Set and discards the PDU; wherein the first PDU Set is a PDU Set which is marked to be allowed to be subjected to packet loss. By adopting the method, the condition of network congestion can be effectively relieved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a packet loss method, apparatus, communication equipment, storage medium and computer program product. Background Art

[0002] With the development of communication technologies such as 5G, there is real-time transmission of a large amount of data in the extended reality multimedia service business, which makes UPF (User Plane Function) network elements and base stations prone to congestion. How to alleviate network congestion while ensuring normal data transmission has become a problem that needs to be solved urgently. Summary of the invention

[0003] The embodiments of the present application provide a packet loss method, apparatus, communication device, storage medium and computer program product, which can effectively alleviate network congestion.

[0004] In a first aspect, the present application provides a packet loss method, the method comprising: when the current network congestion situation meets the first packet loss trigger condition, the user plane function UPF network element selects a PDU from a first protocol data unit set PDU Set for discarding; wherein the first PDU Set is a PDU Set marked as allowing packet loss.

[0005] In one of the embodiments, it also includes: when the current network congestion situation meets the first packet loss trigger condition, the UPF network element prohibits discarding the PDU in the second PDU Set; wherein the second PDU Set is marked as a PDU Set that does not allow packet loss.

[0006] In one of the embodiments, it also includes: when the current network congestion situation meets the second packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set and the second PDU Set to discard; wherein the network congestion situation corresponding to the second packet loss trigger condition is worse than the network congestion situation corresponding to the first packet loss trigger condition.

[0007] In one of the embodiments, the UPF network element selects a PDU to discard from a first PDU Set and a second PDU Set, including: the UPF network element selects a PDU to discard from the first PDU Set and the second PDU Set according to a target priority order; wherein, in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set.

[0008] In one of the embodiments, it also includes: when the current network congestion situation meets the trigger condition for stopping packet loss, the UPF network element stops discarding the PDU.

[0009] In one of the embodiments, the PDUs in the first PDU Set jointly carry a first information unit of the application layer, wherein the first information unit can be recovered if the PDU in the first PDU Set is missing; the PDUs in the second PDU Set jointly carry a second information unit of the application layer, wherein the second information unit cannot be recovered if the PDU in the second PDU Set is missing.

[0010] In one of the embodiments, when the current network congestion situation meets the first packet loss trigger condition, the user plane function UPF network element selects PDU from the first protocol data unit set PDU Set to discard, including: receiving packet loss authorization information sent by the session management function SMF network element; when the packet loss authorization information indicates that packet loss is allowed, executing the step of the UPF network element selecting PDU from the first PDU Set to discard when the current network congestion situation meets the first packet loss trigger condition.

[0011] In one of the embodiments, when the current network congestion situation meets the first packet loss trigger condition, the user plane function UPF network element selects PDU from the first protocol data unit set PDU Set for discarding, including: receiving the first packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the first packet loss trigger condition; when the current network congestion situation meets the first packet loss trigger condition, the UPF network element executes the step of selecting PDU from the first PDU Set for discarding according to the packet loss policy corresponding to the first packet loss trigger condition.

[0012] In one of the embodiments, when the current network congestion situation meets the second packet loss trigger condition, the UPF network element selects PDU from the first PDU Set and the second PDU Set for discarding, including: receiving the second packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the second packet loss trigger condition; when the current network congestion situation meets the second packet loss trigger condition, the UPF network element executes the step of selecting PDU from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition.

[0013] In one of the embodiments, before the user plane function UPF network element selects a PDU from the first protocol data unit set PDU Set to discard, it also includes: receiving matching auxiliary information sent by the SMF network element; the UPF network element identifies and marks the PDU Set according to the matching auxiliary information.

[0014] In one of the embodiments, the packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information sent by the SMF network element are sent by the SMF network element based on the quality of service QoS request sent by the application layer function AF network element. The QoS request includes: packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information.

[0015] In one of the embodiments, the network congestion condition includes air interface congestion condition and / or UPF network element congestion condition.

[0016] In one of the embodiments, it also includes: receiving load monitoring configuration information sent by the SMF network element; performing load monitoring according to the load monitoring configuration information to determine the congestion situation of the UPF network element and / or the air interface congestion situation.

[0017] In the second aspect, the present application provides a packet loss device, which includes: a packet loss module, which is used for the UPF network element to select a PDU from a first protocol data unit set PDU Set to discard when the current network congestion situation meets the first packet loss trigger condition; wherein the first PDU Set is a PDU Set marked as allowing packet loss.

[0018] In one of the embodiments, the packet loss module is also used to prohibit the UPF network element from discarding the PDU in the second PDU Set when the current network congestion situation meets the first packet loss trigger condition; wherein the second PDU Set is a PDU Set marked as not allowing packet loss.

[0019] In one of the embodiments, the packet loss module is also used to select a PDU from the first PDU Set and the second PDU Set for discarding by the UPF network element when the current network congestion situation meets the second packet loss trigger condition; wherein the network congestion situation corresponding to the second packet loss trigger condition is worse than the network congestion situation corresponding to the first packet loss trigger condition.

[0020] In one of the embodiments, the packet loss module is specifically used for the UPF network element to select a PDU to be discarded from a first PDU Set and a second PDU Set according to a target priority order; wherein, in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set.

[0021] In one of the embodiments, the packet loss module is also used to cause the UPF network element to stop discarding PDUs when the current network congestion situation meets the trigger condition for stopping packet loss.

[0022] In one of the embodiments, the PDUs in the first PDU Set jointly carry a first information unit of the application layer, wherein the first information unit can be recovered if the PDU in the first PDU Set is missing; the PDUs in the second PDU Set jointly carry a second information unit of the application layer, wherein the second information unit cannot be recovered if the PDU in the second PDU Set is missing.

[0023] In one of the embodiments, the packet loss module is specifically used to receive packet loss authorization information sent by the session management function SMF network element; when the packet loss authorization information indicates that packet loss is allowed, the UPF network element selects a PDU from the first PDU Set to discard the PDU when the current network congestion meets the first packet loss trigger condition.

[0024] In one of the embodiments, the packet loss module includes a first packet loss unit, which is used to receive a first packet loss trigger condition sent by the SMF network element and a packet loss policy corresponding to the first packet loss trigger condition; when the current network congestion situation meets the first packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDU Set for discarding according to the packet loss policy corresponding to the first packet loss trigger condition.

[0025] In one of the embodiments, the packet loss module includes a second packet loss unit, which is used to receive a second packet loss trigger condition sent by the SMF network element and a packet loss policy corresponding to the second packet loss trigger condition; when the current network congestion situation meets the second packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition.

[0026] In one of the embodiments, the device also includes a processing module for receiving matching auxiliary information sent by the SMF network element; the UPF network element identifies and marks the PDU Set based on the matching auxiliary information.

[0027] In one of the embodiments, the packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information sent by the SMF network element are sent by the SMF network element based on the quality of service QoS request sent by the application layer function AF network element. The QoS request includes: packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information.

[0028] In one of the embodiments, the network congestion condition includes air interface congestion condition and / or UPF network element congestion condition.

[0029] In one of the embodiments, the device also includes a determination module for receiving load monitoring configuration information sent by the SMF network element; performing load monitoring according to the load monitoring configuration information to determine the congestion situation of the UPF network element and / or the air interface congestion situation.

[0030] In a third aspect, the present application provides a communication device, including a memory, a processor and a transceiver, wherein the memory stores a computer program, and when the processor executes the computer program, it controls the transceiver to implement the steps of the packet loss method described in any one of the first aspects.

[0031] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the steps of the packet loss method described in any one of the first aspects are implemented.

[0032] In a fifth aspect, the present application further provides a chip, wherein the chip includes a programmable logic circuit and / or program instructions, and when the chip is running, the steps of the packet loss method described in any one of the first aspects are implemented.

[0033] In a sixth aspect, the present application further provides a computer program product, including a computer program, characterized in that when the computer program is executed by a processor, the steps of the packet loss method described in any one of the above-mentioned first aspects are implemented.

[0034] The above-mentioned packet loss method, apparatus, communication equipment, storage medium and computer program product, when the current network congestion situation meets the first packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set to discard; wherein the first PDU Set is marked as a PDU Set that allows packet loss, so that in the case of network congestion, the UPF network element discards the PDU in the PDU Set that allows packet loss to alleviate network congestion, thereby ensuring to the greatest extent possible that the PDU in the PDU Set that does not allow packet loss is not discarded, thereby ensuring normal data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 A diagram of an application environment of a packet loss method in an embodiment;

[0036] Figure 2 A schematic diagram of a flow chart of a packet loss method in an embodiment;

[0037] Figure 3 A schematic diagram of a flow chart of another packet loss method in an embodiment;

[0038] Figure 4 is a flow chart of yet another packet loss method in an embodiment;

[0039] Figure 5 is a structural block diagram of a packet loss device in an embodiment;

[0040] Figure 6 is a structural block diagram of another packet loss device in an embodiment;

[0041] Figure 7 is a schematic structural diagram of a communication device in an embodiment;

[0042] Figure 8 FIG. 4 is a schematic structure of a chip in an embodiment. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] Figure 1 A schematic diagram of an application scenario of a packet loss method provided in an embodiment of the present application. Figure 1As shown, the scenario includes all network elements of RAN (Radio Access Network, wireless access network) network elements, UPF network elements, AMF (Authentication Management Function, authentication management function) network elements, SMF (Session Management Function, session management function) network elements, PCF (Policy Control function, policy control function) network elements, NEF (Network Exposure Function, network exposure function) network elements and AF (Application Function, application function) network elements, and may also include only a part of the network elements. The above-mentioned multiple network elements can be connected to a service bus and communicate with each other through the service bus. The service bus can also be understood as a message bus. A network element can call services provided by other network elements by sending messages directed to the target network element on the service bus. The above-mentioned multiple network elements are network elements of the core network in the wireless communication network, wherein the wireless communication network can be a Global System of Mobilecommunication (GSM) or Code Division Multiple Access (CDMA) network, or a Wideband Code Division Multiple Access (WCDMA) network, or a Long Term Evolution (LTE) network, or a 5G network, which is not limited here.

[0045] In the business data flow of extended reality multimedia services, there are generally multiple PDUs (Protocol Data Units) that are interrelated and jointly carry an information unit of the application layer (such as I frames and P frames in video transmission). Therefore, in 3GPP FS_XRM, a group of related PDUs is divided into a PDU Set to implement PDU Set granularity processing in 5GS (5G System). For some PDU Sets, the loss of a PDU in a PDU Set is sufficient to cause the information carried by the entire PDU Set to become invalid. If the base station / UPF network element detects packet loss, the other unsent PDUs of the PDU Set should be discarded to save resources. For other PDU Sets, the receiving end can recover part or all of the information carried by the PDU Set when some PDUs are lost. If the base station / UPF network element detects packet loss, it should continue to send the remaining PDUs.

[0046] In traditional technology, when downlink data transmission is congested, the UPF network element cannot adjust the transmission of the N3 tunnel in time according to the congestion situation. After the PDU is transmitted to the base station, it is discarded due to congestion. When the discarded PDU is sufficient to cause the information carried by the entire PDU Set to become invalid, it will cause a waste of transmission resources and aggravate the congestion situation.

[0047] Based on the above-mentioned traditional technology, an embodiment of the present application provides a packet loss method. When the current network congestion situation meets the first packet loss trigger condition, the UPF network element selects a PDU from the PDU Set marked as allowing packet loss for discarding, thereby effectively alleviating network congestion.

[0048] It should be noted that the beneficial effects brought about by the embodiments of the present application or the technical problems solved are not limited to this one, but may also include other implicit or related problems. For details, please refer to the description of the following embodiments.

[0049] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0050] In one embodiment, a packet loss method is provided, which is applied to Figure 1 The UPF network element in the example is described, including the following steps:

[0051] When the current network congestion meets the first packet loss triggering condition, the UPF network element selects a PDU from the first PDU Set to discard; wherein the first PDU Set is a PDU Set marked as allowing packet loss.

[0052] Among them, UPF is the user plane network element in the 5GC (5G Core, 5G core network) network, which mainly supports the routing and forwarding of UE (User Equipment) service data, data and service identification, action and policy execution, etc. The UPF network element interacts with the SMF network element through the N4 interface, is directly controlled and managed by the SMF network element, and performs service flow processing according to various policies issued by the SMF. Therefore, the first packet loss trigger condition and when the current network congestion meets the first packet loss trigger condition, the policy of selecting a PDU to discard from the PDU Set marked as allowing packet loss can be sent by the SMF network element to the UPF network element, specifically, it can be sent by the SMF network element to the UPF network element through the packet forwarding rule.

[0053] The PDUs in the PDU Set are interrelated and jointly carry an information unit of the application layer, such as I frames and P frames in video transmission. For some PDU Sets, some PDUs in the PDU Set are lost, and the receiving end, that is, the UE, can recover part or all of the information carried by the PDU Set. For such PDU Sets, the UPF network element can mark it as a PDU Set that allows packet loss, thereby obtaining the first PDU Set mentioned above.

[0054] There are three types of network congestion. The first type is air interface congestion and UPF network element is not congested. The second type is UPF network element congestion and air interface is not congested. The third type is both air interface and UPF network element congestion. Among them, air interface congestion refers to the network congestion between the base station and the UE, and UPF network element congestion refers to the network congestion between the UPF network element and the base station. Therefore, the network congestion situation includes the air interface congestion situation and / or the congestion situation of the UPF network element. Among them, the air interface congestion situation can be reported to the UPF network element by the base station multiplexing QoS monitoring mechanism, and the congestion situation of the UPF network element can be obtained by the UPF network element performing load monitoring.

[0055] The first packet loss triggering condition may be that the network congestion situation must be greater than or equal to a first congestion threshold and less than a second congestion threshold, wherein the second congestion threshold is greater than the first congestion threshold.

[0056] Optionally, if the current network congestion is greater than or equal to the first congestion threshold and less than the second congestion threshold, the UPF network element randomly selects a PDU from the PDU Set marked as allowing packet loss to be discarded and only sends the remaining PDUs.

[0057] For example, the first congestion threshold is 4, the second congestion threshold is 10, and the UPF network element fails to successfully receive the PDU from the base station to the UE 8 times, that is, the air interface congestion situation is 8. The PDU Sets that are allowed to lose packets are A, B and C. The PDUs in A include PDU1, PDU2 and PDU3, that is, A{PDU1, PDU2, PDU3}, and similarly there are B{PDU4, PDU5, PDU6}, C{PDU7, PDU8, PDU9}. In the process of sending PDUs to the base station next, the UPF network element arbitrarily selects B and C, and randomly discards PDU6 in B, and randomly discards PDU7 and PDU8 in C. The UPF network element only sends PDU1, PDU2, PDU3, PDU4, PDU5 and PDU8 to the base station.

[0058] To summarize, when the current network congestion meets the first packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set to discard; wherein, the first PDU Set is marked as a PDU Set that allows packet loss. In this way, in the case of network congestion, the UPF network element discards the PDU in the PDU Set that allows packet loss to alleviate network congestion, thereby ensuring to the greatest extent possible that the PDU in the PDU Set that does not allow packet loss is not discarded, thereby ensuring normal data transmission.

[0059] In one of the embodiments, it may also include: when the current network congestion situation meets the first packet loss trigger condition, the UPF network element prohibits discarding the PDU in the second PDU Set; wherein the second PDU Set is marked as a PDU Set that does not allow packet loss.

[0060] As mentioned above, the PDUs in the PDU Set are interrelated and jointly carry an information unit of the application layer. For some PDU Sets, the loss of a PDU in the PDU Set will cause the information carried by the entire PDU Set to become invalid and cannot be recovered. For such PDU Sets, the UPF network element can mark them as PDU Sets that do not allow packet loss, thereby obtaining the second PDU Set mentioned above.

[0061] Optionally, when the current network congestion is greater than or equal to the first congestion threshold and less than the second congestion threshold, the UPF network element can only select PDUs for discarding from the PDU Set marked as allowing packet loss, and is prohibited from selecting PDUs for discarding from the PDU Set marked as not allowing packet loss.

[0062] In one of the embodiments, it may also include: when the current network congestion situation meets the second packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set and the second PDU Set for discarding; wherein the network congestion situation corresponding to the second packet loss trigger condition is worse than the network congestion situation corresponding to the first packet loss trigger condition.

[0063] Among them, the second packet loss trigger condition may be that the network congestion situation must be greater than or equal to the second congestion threshold. When the network congestion situation is greater than or equal to the second congestion threshold, it means that the network congestion is relatively serious, and only discarding the PDU in the first PDU Set (PDU Set that allows packet loss) may not alleviate the network congestion, and the PDU in the second PDU Set (PDU Set that does not allow packet loss) needs to be discarded.

[0064] In this case, the UPF network element selects a PDU from the first PDU Set and the second PDU Set for discarding in the following two optional ways:

[0065] In the first method, the UPF network element selects PDUs from the first PDU Set and the second PDU Set for discarding according to the target priority order; wherein, in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set. In other words, the UPF network element first selects PDUs from the first PDU Set for discarding, and then selects PDUs from the second PDU Set for discarding.

[0066] The second type is that the UPF network element randomly selects a PDU from the first PDU Set and the second PDU Set to discard. In other words, the UPF network element treats the first PDU Set and the second PDU Set equally and randomly selects a PDU from them to discard.

[0067] In one of the embodiments, it may also include: when the current network congestion situation meets the trigger condition for stopping packet loss, the UPF network element stops discarding the PDU.

[0068] Optionally, the trigger condition for stopping packet loss may be that the network congestion situation is less than the first congestion threshold, or it may be that a congestion end report sent by the base station is received. Therefore, when the current network congestion situation is less than the first congestion threshold, or when the congestion end report sent by the base station is received, the UPF network element no longer selects PDUs from the first PDU Set and / or the second PDU Set for discarding, but sends all the PDUs in the first PDU Set and the second PDU Set to the base station intact.

[0069] In one of the embodiments, before the UPF network element selects a PDU from the PDU Set to discard, it may also include: receiving matching auxiliary information sent by the SMF network element; the UPF network element identifies and marks the PDU Set according to the matching auxiliary information.

[0070] Among them, the matching auxiliary information can help the UPF network element match different PDUs to different PDU Sets.

[0071] Optionally, the UPF network element divides the PDUs that jointly carry an information unit of the application layer into a PDU Set, and then marks the PDU Set according to whether the information unit can be recovered when there is a missing PDU in the PDU Set.

[0072] For the information unit that can be recovered, that is, the first information unit, the PDU Set carrying the first information unit is marked as a PDU Set that allows packet loss. This type of PDU Set is the first PDU Set in this application.

[0073] For the information unit that cannot be restored, that is, the second information unit, the PDU Set carrying the second information unit is marked as a PDU Set that does not allow packet loss. This type of PDU Set is the second PDU Set in this application.

[0074] In summary, the PDUs in the first PDU Set jointly carry the first information unit of the application layer, wherein the first information unit can be recovered if the PDU in the first PDU Set is missing; the PDUs in the second PDU Set jointly carry the second information unit of the application layer, wherein the second information unit cannot be recovered if the PDU in the second PDU Set is missing.

[0075] In one of the embodiments, when the current network congestion situation meets the first packet loss trigger condition, the UPF network element selects a PDU from the PDU Set to discard, which may include: receiving packet loss authorization information sent by the SMF network element; when the packet loss authorization information indicates that packet loss is allowed, executing the step of the UPF network element selecting a PDU from the first PDU Set to discard when the current network congestion situation meets the first packet loss trigger condition.

[0076] Among them, the packet loss authorization information includes 0 and 1, 0 means that the UPF network element is not allowed to lose packets according to the steps in any packet loss method embodiment in the present application, and 1 means that the UPF network element is allowed to lose packets according to the steps in any packet loss method embodiment in the present application.

[0077] Optionally, when the packet loss authorization information sent by the receiving SMF network element is 1, if the current network congestion meets the first packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set for discarding.

[0078] When the packet loss authorization information sent by the receiving SMF network element is 0, even if the current network congestion meets the first packet loss trigger condition, the UPF network element will not select PDU from the first PDU Set for discarding.

[0079] In one of the embodiments, when the current network congestion situation meets the first packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set for discarding, which may include: receiving the first packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the first packet loss trigger condition; when the current network congestion situation meets the first packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDU Set for discarding according to the packet loss policy corresponding to the first packet loss trigger condition.

[0080] The packet loss strategy corresponding to the first packet loss trigger condition may be to randomly select a PDU from the first PDU Set for discarding, or to select a preset number of PDUs from the first PDU Set for discarding. In addition, it should be noted that the UPF network element selects a PDU from the first PDU Set for discarding according to the packet loss strategy corresponding to the first packet loss trigger condition. There are two prerequisites for this. One is that the packet loss authorization information sent by the SMF network element is received to indicate that packet loss is allowed, and the other is that the current network congestion condition satisfies the first packet loss trigger condition. Therefore, this embodiment provides a packet loss method, such as Figure 2 As shown, the method comprises the following steps:

[0081] Step 201, receiving the packet loss authorization information sent by the SMF network element, and receiving the first packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the first packet loss trigger condition.

[0082] Step 202: When the packet loss authorization information indicates that packet loss is allowed and the current network congestion meets the first packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set for discarding according to the packet loss policy corresponding to the first packet loss trigger condition.

[0083] In one of the embodiments, when the current network congestion situation meets the second packet loss trigger condition, the UPF network element selects PDU from the first PDU Set and the second PDU Set for discarding, which may include: receiving the second packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the second packet loss trigger condition; when the current network congestion situation meets the second packet loss trigger condition, the UPF network element executes the step of selecting PDU from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition.

[0084] The packet loss strategy corresponding to the second packet loss trigger condition may be that the UPF network element selects a PDU from the first PDU Set and the second PDU Set for discarding according to the target priority order, wherein in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set. The packet loss strategy corresponding to the second packet loss trigger condition may also be that the UPF network element randomly selects a PDU from the first PDU Set and the second PDU Set for discarding.

[0085] In addition, it should be noted that the UPF network element selects PDUs from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition. There are two prerequisites: one is that the packet loss authorization information sent by the SMF network element is received to indicate that packet loss is allowed, and the other is that the current network congestion meets the second packet loss trigger condition. Therefore, this embodiment provides another packet loss method, such as Figure 3 As shown, the method comprises the following steps:

[0086] Step 301, receive the packet loss authorization information sent by the SMF network element, and receive the second packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the second packet loss trigger condition.

[0087] Step 302: When the packet loss authorization information indicates that packet loss is allowed and the current network congestion meets the second packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition.

[0088] In one of the embodiments, the packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information sent by the SMF network element are sent by the SMF network element according to the QoS request sent by the AF network element. The QoS request may include: packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information.

[0089] Among them, AF network element can refer to an application server, which can interact with other 5GC control plane NF (Network Function) network elements. QoS is the full name of Quality of Service in English, which is service quality in Chinese.

[0090] The packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition and the matching auxiliary information sent by the above-mentioned SMF network element can be sent to the UPF network element through the packet forwarding rules generated by the SMF network element, or can be sent to the UPF network element in other forms, which is not limited here.

[0091] In the following, the first packet loss triggering condition, the packet loss policy corresponding to the first packet loss triggering condition, the second packet loss triggering condition, and the second packet loss triggering condition are collectively referred to as conditions for triggering packet loss for ease of reading.

[0092] Optional, such as Figure 4 As shown, this embodiment provides another packet loss method, the method comprises the following steps:

[0093] Step 401: The AF network element sends a QoS request to the PCF network element through the NEF network element. If the AF network element is trustworthy by the operator, the AF network element can directly send the QoS request to the PCF network element.

[0094] The QoS request includes packet loss authorization information and conditions for triggering packet loss. Optionally, the QoS request may also include matching auxiliary information so that the UPF network element can identify and mark the PDU Set according to the matching auxiliary information.

[0095] Step 402: The PCF network element formulates PCC (Policy Control and Charging) rules according to the received QoS request, and sends the PCC rules to the SMF network element.

[0096] Among them, PCC rules include UPF and base station ( Figure 4 The PCC rules also include load monitoring strategies (denoted by RAN in the figure), which include monitoring frequency and reporting trigger events. The PCC rules also include load-related QoS rules, which include packet loss authorization information and conditions for triggering packet loss, where the conditions for triggering packet loss may be in the form shown in Table 1. When the network congestion meets the first packet loss trigger condition, the UPF network element needs to execute the QoS policy corresponding to Network load level_1; when the network congestion meets the second packet loss trigger condition, the UPF network element needs to execute the QoS policy corresponding to Network load level_2 or Network load level_3.

[0097] Table 1

[0098]

[0099]

[0100] Step 403, the SMF network element generates a packet forwarding rule based on the received PCC rule, allowing the UPF network element to perform the packet loss operation. The SMF network element sends the load monitoring configuration information and the packet forwarding rule to the UPF network element through the N4 session.

[0101] The packet forwarding rules include the QoS rules in the PCC rules, and the load monitoring configuration information is generated by the SMF network element according to the load monitoring policy in the PCC rules.

[0102] In step 404, the UPF network element identifies and marks the PDU Set of the PDU, and performs load monitoring according to the load monitoring configuration information sent by the SMF network element to determine the congestion situation of the UPF network element and / or the air interface congestion situation.

[0103] Among them, the UPF network element can identify and mark the PDU Set according to the above-mentioned matching auxiliary information (note: if the QoS request contains matching auxiliary information, the PCC rule and the packet forwarding rule both contain matching auxiliary information), or it can increase the function of the UPF so that it can directly identify and mark the PDU Set, thereby dividing the PDU of an information unit that carries a common application into a PDU Set, and marking the PDU Set that carries the first information unit of the application layer as a PDU Set that allows packet loss, and marking the PDU Set that carries the second information unit of the application layer as a PDU Set that does not allow packet loss, wherein the first information unit is an information unit that can be recovered when the PDU in the PDU Set is missing, and the second information unit is an information unit that cannot be recovered when the PDU in the PDU Set is missing.

[0104] The UPF network element performs load monitoring, for example, the UPF network element receives the code of the unreceived PDU reported by the base station once every 2 seconds, and counts the number of unreceived PDU codes reported by the base station within a preset time, thereby determining the congestion of the UPF network element. Alternatively, the UPF network element receives the air interface congestion reported by the base station.

[0105] Step 405, the SMF network element sends the load monitoring configuration information to the base station through the AMF network element.

[0106] Step 406: The base station performs load monitoring according to the load monitoring configuration information sent by the SMF network element.

[0107] Step 407a: When the base station detects that the air interface congestion situation meets the first preset threshold, the base station uses the QoS monitoring mechanism to report the air interface congestion situation to the UPF network element.

[0108] Step 407b: The UPF network element detects that the UPF network element is congested.

[0109] Step 408, if the air interface congestion situation and / or the congestion situation of the UPF network element meets the first trigger condition, the UPF network element selects some PDUs from the PDU Set marked as allowing packet loss for discarding; if the air interface congestion situation and / or the congestion situation of the UPF network element meets the second trigger condition, the UPF network element selects some PDUs from the PDU Set marked as allowing packet loss and the PDU Set marked as not allowing packet loss for discarding, that is, when the air interface congestion situation and / or the congestion situation of the UPF network element meets the first trigger condition or the second trigger condition, the UPF network element actively drops packets to alleviate network congestion.

[0110] Step 409a: After the base station detects that the air interface congestion has been alleviated, it uses the QoS monitoring mechanism to report the end of congestion to the UPF network element.

[0111] Step 409b: The UPF network element detects that the congestion of the UPF network element has been alleviated.

[0112] Step 4010: The UPF network element stops actively dropping packets.

[0113] It should be understood that although Figure 2-4 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 2-4 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0114] In one embodiment, Figure 5 As shown, a packet loss device is provided, the packet loss device 500 includes: a packet loss module 501, wherein:

[0115] The packet loss module 501 is used for the UPF network element to select a PDU from the first protocol data unit set PDU Set to discard when the current network congestion meets the first packet loss trigger condition; wherein the first PDU Set is a PDU Set marked as allowing packet loss.

[0116] In one of the embodiments, the packet loss module 501 is also used to prohibit the UPF network element from discarding the PDU in the second PDU Set when the current network congestion situation meets the first packet loss trigger condition; wherein the second PDU Set is a PDU Set marked as not allowing packet loss.

[0117] In one of the embodiments, the packet loss module 501 is also used to select a PDU from the first PDU Set and the second PDU Set for discarding by the UPF network element when the current network congestion situation meets the second packet loss trigger condition; wherein the network congestion situation corresponding to the second packet loss trigger condition is worse than the network congestion situation corresponding to the first packet loss trigger condition.

[0118] In one of the embodiments, the packet loss module 501 is specifically used for the UPF network element to select a PDU to be discarded from the first PDU Set and the second PDU Set according to a target priority order; wherein, in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set.

[0119] In one of the embodiments, the packet loss module 501 is also used for the UPF network element to stop discarding PDUs when the current network congestion situation meets the trigger condition for stopping packet loss.

[0120] In one of the embodiments, the PDUs in the first PDU Set jointly carry a first information unit of the application layer, wherein the first information unit can be recovered if the PDU in the first PDU Set is missing; the PDUs in the second PDU Set jointly carry a second information unit of the application layer, wherein the second information unit cannot be recovered if the PDU in the second PDU Set is missing.

[0121] In one of the embodiments, the packet loss module 501 is specifically used to receive packet loss authorization information sent by the session management function SMF network element; when the packet loss authorization information indicates that packet loss is allowed, the UPF network element selects a PDU from the first PDU Set to discard the PDU when the current network congestion meets the first packet loss trigger condition.

[0122] In one of the embodiments, the packet loss module 501 includes a first packet loss unit, which is used to receive a first packet loss trigger condition sent by the SMF network element and a packet loss policy corresponding to the first packet loss trigger condition; when the current network congestion situation meets the first packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDUSet for discarding according to the packet loss policy corresponding to the first packet loss trigger condition.

[0123] In one of the embodiments, the packet loss module 501 includes a second packet loss unit, which is used to receive a second packet loss trigger condition sent by the SMF network element and a packet loss policy corresponding to the second packet loss trigger condition; when the current network congestion situation meets the second packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition.

[0124] In one embodiment, if Figure 6 As shown, another packet loss device is provided, and the packet loss device 500 also includes a processing module 502 for receiving matching auxiliary information sent by the SMF network element; the UPF network element identifies and marks the PDU Set according to the matching auxiliary information.

[0125] In one of the embodiments, the packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information sent by the SMF network element are sent by the SMF network element based on the quality of service QoS request sent by the application layer function AF network element. The QoS request includes: packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information.

[0126] In one of the embodiments, the network congestion condition includes air interface congestion condition and / or UPF network element congestion condition.

[0127] In one of the embodiments, the device also includes a determination module 503, which is used to receive load monitoring configuration information sent by the SMF network element; perform load monitoring according to the load monitoring configuration information to determine the congestion situation of the UPF network element and / or the air interface congestion situation.

[0128] It should be noted that the above-mentioned packet loss module 501, processing module 502 and determination module 503 are all set in the UPF network element.

[0129] For the specific definition of the packet loss device, please refer to the definition of the packet loss method above, which will not be repeated here. Each module in the above-mentioned packet loss device can be implemented in whole or in part by software, hardware and a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory of the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0130] Figure 7A schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device may include a transceiver 701, a memory 702, a processor 703, and at least one communication bus 704. The communication bus 704 is used to realize the communication connection between components. The memory 702 may include a high-speed RAM memory, and may also include a non-volatile storage NVM, such as at least one disk memory. Various programs may be stored in the memory 702 to complete various processing functions and implement the method steps of this embodiment. In this embodiment, the transceiver 701 may be a radio frequency processing module or a baseband processing module in the communication device, and the transceiver 701 may be coupled to the processor 703, which can realize the receiving or transmitting action under the instruction or control of the processor 703.

[0131] In this embodiment, the processor 703 controls the transceiver 701 to select a PDU from a first protocol data unit set PDU Set to discard when the current network congestion meets the first packet loss trigger condition; wherein the first PDU Set is a PDU Set marked as allowing packet loss.

[0132] In one embodiment, the processor 703 controls the transceiver 701 to prohibit discarding the PDU in the second PDU Set when the current network congestion meets the first packet loss trigger condition; wherein the second PDU Set is a PDU Set marked as not allowing packet loss.

[0133] In one embodiment, the processor 703 controls the transceiver 701 to select a PDU from the first PDU Set and the second PDU Set to discard when the current network congestion situation meets the second packet loss trigger condition; wherein the network congestion situation corresponding to the second packet loss trigger condition is worse than the network congestion situation corresponding to the first packet loss trigger condition.

[0134] In one of the embodiments, the processor 703 controls the transceiver 701 to select a PDU from the first PDU Set and the second PDU Set for discarding according to a target priority order; wherein, in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set.

[0135] In one of the embodiments, the processor 703 controls the transceiver 701 to stop discarding the PDU when the current network congestion situation satisfies the trigger condition for stopping packet loss.

[0136] In one of the embodiments, the PDUs in the first PDU Set jointly carry a first information unit of the application layer, wherein the first information unit can be recovered if the PDU in the first PDU Set is missing; the PDUs in the second PDU Set jointly carry a second information unit of the application layer, wherein the second information unit cannot be recovered if the PDU in the second PDU Set is missing.

[0137] In one of the embodiments, the processor 703 controls the transceiver 701 to receive packet loss authorization information sent by the session management function SMF network element; when the packet loss authorization information indicates that packet loss is allowed, the step of selecting a PDU from the first PDU Set for discarding is executed when the current network congestion meets the first packet loss trigger condition.

[0138] In one of the embodiments, the processor 703 controls the transceiver 701 to receive a first packet loss trigger condition and a packet loss policy corresponding to the first packet loss trigger condition sent by the SMF network element; when the current network congestion situation meets the first packet loss trigger condition, the step of selecting a PDU from the first PDU Set for discarding is executed according to the packet loss policy corresponding to the first packet loss trigger condition.

[0139] In one of the embodiments, the processor 703 controls the transceiver 701 to receive the second packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the second packet loss trigger condition; when the current network congestion situation meets the second packet loss trigger condition, the step of selecting a PDU from the first PDU Set and the second PDU Set for discarding is executed according to the packet loss policy corresponding to the second packet loss trigger condition.

[0140] In one of the embodiments, the processor 703 controls the transceiver 701 to receive matching auxiliary information sent by the SMF network element; and performs PDU Set identification and marking processing on the PDU according to the matching auxiliary information.

[0141] In one of the embodiments, the packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information sent by the SMF network element are sent by the SMF network element based on the quality of service QoS request sent by the application layer function AF network element. The QoS request includes: packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and matching auxiliary information.

[0142] In one of the embodiments, the network congestion condition includes air interface congestion condition and / or UPF network element congestion condition.

[0143] In one embodiment, the processor 703 controls the transceiver 701 to receive load monitoring configuration information sent by the SMF network element; performs load monitoring according to the load monitoring configuration information to determine the congestion situation of the UPF network element and / or the air interface congestion situation.

[0144] In one embodiment, a chip is provided. Figure 8 It is a schematic structural diagram of the chip of an embodiment of the present application. Figure 8 The chip 800 shown includes a processor 801, which can call and run a computer program from a memory to implement the method in the embodiment of the present application.

[0145] Alternatively, if Figure 8 As shown, the chip 800 may further include a memory 802. The processor 801 may call and run a computer program from the memory 802 to implement the method in the embodiment of the present application. The memory 802 may be a separate device independent of the processor 801, or may be integrated in the processor 801.

[0146] Optionally, the chip 800 may further include an input interface 803. The processor 801 may control the input interface 803 to communicate with other devices or chips, and specifically, may obtain information or data sent by other devices or chips. Optionally, the chip 800 may further include an output interface 804. The processor 801 may control the output interface 804 to communicate with other devices or chips, and specifically, may output information or data to other devices or chips.

[0147] Optionally, the chip 800 can be applied to the communication device in the embodiments of the present application, and the chip 800 can implement the corresponding processes implemented by the communication device in each method of the embodiments of the present application, which will not be described here for the sake of brevity.

[0148] It should be understood that the chip 800 mentioned in the embodiment of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc. It should be understood that the processor of the embodiment of the present application may be an integrated circuit chip with signal processing capabilities. In the implementation process, each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software. The above processor can be a general-purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application-specific integrated circuit (Application Specific Integrated Circuit, ASIC), a field programmable gate array (Field Programmable Gate Array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The methods, steps and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor, etc. The steps of the method disclosed in the embodiment of the present application can be directly embodied as a hardware decoding processor to execute, or the hardware and software modules in the decoding processor are combined and executed. The software module can be located in a mature storage medium in the field such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0149] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned packet loss method embodiment are implemented.

[0150] In one embodiment, a computer program product including instructions is provided, which, when executed on a computer, enables the computer to execute the steps in the above-mentioned packet loss method embodiment.

[0151] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0152] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0153] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A packet loss method, characterized in that: The method comprises: When the current network congestion meets the first packet loss trigger condition, the user plane function UPF network element selects a PDU from the first protocol data unit set PDU Set to discard; The first PDU Set is a PDU Set marked as allowing packet loss.

2. The method according to claim 1, characterized in that: The method further comprises: When the current network congestion meets the first packet loss trigger condition, the UPF network element is prohibited from discarding the PDU in the second PDU Set; The second PDU Set is a PDU Set marked as one in which packet loss is not allowed.

3. The method according to claim 2, characterized in that The method further comprises: When the current network congestion meets the second packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set and the second PDU Set to discard; The network congestion situation corresponding to the second packet loss triggering condition is worse than the network congestion situation corresponding to the first packet loss triggering condition.

4. The method according to claim 3, characterized in that The UPF network element selects a PDU from the first PDU Set and the second PDU Set to discard, including: The UPF network element selects a PDU from the first PDU Set and the second PDU Set to discard according to a target priority order; Among them, in the target priority order, the priority of the first PDU Set is greater than the priority of the second PDU Set.

5. The method according to claim 3, characterized in that: The method further comprises: When the current network congestion situation meets the trigger condition for stopping packet loss, the UPF network element stops discarding PDUs.

6. The method according to any one of claims 2 to 5, characterized in that: The PDUs in the first PDU Set jointly carry a first information unit of an application layer, wherein the first information unit can be restored when the PDUs in the first PDU Set are missing; The PDUs in the second PDU Set jointly carry a second information unit of the application layer, wherein the second information unit cannot be restored when the PDUs in the second PDU Set are missing.

7. The method according to claim 3, characterized in that When the current network congestion situation meets the first packet loss triggering condition, the user plane function UPF network element selects a PDU from the first protocol data unit set PDU Set to discard, including: Receive packet loss authorization information sent by the session management function SMF network element; When the packet loss authorization information indicates that packet loss is allowed, the UPF network element selects a PDU from the first PDU Set to discard the PDU when the current network congestion meets the first packet loss trigger condition.

8. The method according to claim 7, characterized in that When the current network congestion situation meets the first packet loss triggering condition, the user plane function UPF network element selects a PDU from the first protocol data unit set PDU Set to discard, including: Receive the first packet loss trigger condition and the packet loss policy corresponding to the first packet loss trigger condition sent by the SMF network element; When the current network congestion situation meets the first packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDU Set for discarding according to the packet loss policy corresponding to the first packet loss trigger condition.

9. The method according to claim 8, characterized in that When the current network congestion condition satisfies the second packet loss trigger condition, the UPF network element selects a PDU from the first PDU Set and the second PDU Set to discard, including: Receive the second packet loss trigger condition sent by the SMF network element and the packet loss policy corresponding to the second packet loss trigger condition; When the current network congestion situation meets the second packet loss trigger condition, the UPF network element executes the step of selecting a PDU from the first PDU Set and the second PDU Set for discarding according to the packet loss policy corresponding to the second packet loss trigger condition.

10. The method according to claim 9, characterized in that Before the user plane function UPF network element selects a PDU from the first protocol data unit set PDU Set to discard, the method further includes: Receiving matching auxiliary information sent by the SMF network element; The UPF network element identifies and marks the PDU Set according to the matching auxiliary information.

11. The method according to claim 10, characterized in that The packet loss authorization information, the first packet loss trigger condition, the packet loss policy corresponding to the first packet loss trigger condition, the second packet loss trigger condition, the packet loss policy corresponding to the second packet loss trigger condition, and the matching auxiliary information sent by the SMF network element are sent by the SMF network element according to the quality of service QoS request sent by the application layer function AF network element, and the QoS request includes: The packet loss authorization information, the first packet loss triggering condition, the packet loss policy corresponding to the first packet loss triggering condition, the second packet loss triggering condition, the packet loss policy corresponding to the second packet loss triggering condition, and the matching auxiliary information.

12. The method according to any one of claims 1 to 5, characterized in that: The network congestion condition includes the air interface congestion condition and / or the congestion condition of the UPF network element.

13. The method according to claim 12, characterized in that The method further comprises: Receive load monitoring configuration information sent by SMF network elements; Perform load monitoring according to the load monitoring configuration information to determine the congestion situation of the UPF network element and / or the air interface congestion situation.

14. A packet loss device, characterized in that: The device comprises: A packet loss module, configured to cause the UPF network element to select a PDU from a first protocol data unit set PDU Set to be discarded when the current network congestion condition meets a first packet loss trigger condition; The first PDU Set is a PDU Set marked as allowing packet loss.

15. A communication device, comprising a memory, a processor and a transceiver, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the processor implements the steps of the method according to any one of claims 1 to 13 by controlling the transceiver.

16. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 13 are implemented.

17. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 13 are implemented.

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