Communication method, and apparatus

Abstract

The present application relates to a communication method and an apparatus. In the communication method, on the basis of a first traffic control parameter of a first PDU session, an access network device can autonomously determine that there is congestion in a data flow of the first PDU session, so as to send a first congestion notification packet message on the basis of a first flow table of the first PDU session, such that then RDMA technology is used for traffic control in a wireless communication scenario, for example, reducing a queue backlog on a congestion side. This can ensure the low delay of a service, does not affect the throughput of the service, and improves the performance and quality of the service. In addition, the delay of two air interface transmissions can also be reduced, implementing more prompt wireless RDMA traffic control and eliminating congestion more promptly.

Description

A communication method and apparatus

[0001] The present application claims priority to the Chinese patent application No. 202410978981.0, filed on July 19, 2024, with the State Intellectual Property Office of China, and the Chinese patent application No. 202410978981.0 has the title of "A communication method and apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication technology, and in particular, to a communication method and apparatus. BACKGROUND

[0003] In a wired communication scenario, in order to solve the high throughput and low delay demand in network transmission, a remote direct memory access (RDMA) technology is proposed. The RDMA technology is a technology of directly transmitting data between remote computing nodes without the intervention of an operating system. When the RDMA technology is used for data transmission, flow control can be enabled to reduce the influence of network packet loss on network transmission efficiency. However, in a wireless communication scenario, how to perform flow control by introducing the RDMA technology is still in a blank state. SUMMARY

[0004] The present application provides a communication method and apparatus, which can perform flow control by using the RDMA technology in a wireless communication scenario, thereby guaranteeing the low delay of services and improving the performance and quality of services.

[0005] In a first aspect, a communication method is provided. The method can be performed by an access network device, or can be performed by a module (such as a processor, a chip, or a chip system, etc.) applied to the access network device, and can also be implemented by a logic node, a logic module, or software that can realize all or part of the functions of the access network device. Taking the method applied to the access network device as an example, in the method, the access network device can determine that a data flow of a first protocol data unit (PDU) session is congested based on a first flow control parameter of the first PDU session, and the first PDU session is a session established for communication between a terminal and a server. In this way, the access network device can send a first congestion notification packets (CNP) message based on a first flow table of the first PDU session, and the first flow table is used to indicate a forwarding path of the data flow of the first PDU session, and the first CNP message is used to notify that the data flow of the first PDU session is congested.

[0006] It can be seen that in the above embodiments, the access network device can determine that the data flow of the first PDU session is congested based on the first traffic control parameter of the first PDU session, so as to send the first congestion notification packet message based on the first flow table of the first PDU session, and then use the RDMA technology to perform traffic control in the wireless communication scenario, such as reducing the queue backlog on the congested side. This can guarantee the low delay of the service, does not affect the throughput of the service, and improves the performance and quality of the service. On the other hand, the access network device can determine that the number of flows passing through the access network device is congested based on the first traffic control parameter, and send the first congestion notification packet message based on the first flow table, that is, the determination that the data flow of the first PDU session is congested and the sending of the first congestion notification packet message are performed by a single device, i.e., the access network device. This avoids the transmission delay problem caused by the determination that the data flow of the first PDU session is congested and the sending of the first congestion notification packet message being performed by different devices. For example, for downlink transmission, assuming that the determination that the data flow of the first PDU session is congested is performed by the access network device, and the sending of the first congestion notification packet message is performed by the terminal, this means that the access network device needs to send a packet marked with an explicit congestion notification (ECN) to the terminal when determining that the data flow of the first PDU session is congested, thereby helping the terminal to send the first congestion notification packet message. However, in this case, the marked packet needs to be transmitted over the air to the terminal, and the first congestion notification packet message also needs to be transmitted over the air to the access network device and then to the server. This means that from the time the access network device determines that the data flow of the first PDU session is congested to the time the server receives the first congestion notification packet message, there are two air transmissions, which will have two air transmission delays. The air transmission delay is relatively uncontrollable, which may cause a certain hysteresis in the wireless RDMA traffic control. Therefore, the determination that the data flow of the first PDU session is congested and the sending of the first congestion notification packet message are performed by the access network device, which can reduce the two air transmission delays, can achieve more timely wireless RDMA traffic control, and can eliminate congestion more timely.

[0007] In a possible implementation, the method further includes: receiving, by the access network device, the first information from the session management network element, the first information being used to determine the first traffic control parameter.

[0008] It can be seen that in the above embodiments, the access network device can obtain the first information used to determine the first traffic control parameter from the session management network element, so as to determine that the data flow of the first PDU session is congested based on the first traffic control parameter. That is, the access network device can participate in the wireless RDMA traffic control, so that the elimination of congestion is more timely.

[0009] In a possible implementation, the method further includes: the first information is a first quality of service (QoS) requirement corresponding to the first PDU session, and the access network device determines the first flow control parameter based on the first QoS requirement.

[0010] It can be seen that, in the above embodiments, the access network device can determine the first flow control parameter based on the first QoS requirement from the session management network element. This enables the access network device to autonomously determine the first flow control parameter, so that the first flow control parameter determined by the access network device can better meet the requirements of the access network device, and helps the access network device to better perform congestion judgment.

[0011] In a possible implementation, the access network device determines the first flow control parameter based on the first QoS requirement, including: the access network device determines the first flow control parameter based on the first QoS requirement and capability information of the access network device, and the capability information of the access network device includes an air interface transmission rate and / or a buffer size supported by the access network device.

[0012] It can be seen that, in the above embodiments, the access network device can determine the first flow control parameter in combination with the first QoS requirement and the capability information of the access network device, reducing the case that the first flow control parameter determined by the access network device does not meet the capability of the access network device, and helping the access network device to better perform congestion judgment.

[0013] In a possible implementation, the access network device determines the first flow control parameter based on the first QoS requirement corresponding to the first PDU session, including: the access network device determines the first flow control parameter based on the first QoS requirement and a first correspondence relationship. The first correspondence relationship includes a correspondence relationship between a plurality of QoS requirements and a plurality of flow control parameters, and the correspondence relationship between the plurality of QoS requirements and the plurality of flow control parameters includes a correspondence relationship between the first QoS requirement and the first flow control parameter.

[0014] It can be seen that, in the above embodiments, the first QoS requirement corresponds to the first flow control parameter, so that the access network device can determine the first flow control parameter based on the first QoS requirement and the first correspondence relationship, and thus can more timely determine that the data flow of the first PDU session is congested.

[0015] In a possible implementation, the first information is the first flow control parameter.

[0016] It can be seen that, in the above embodiments, the access network device can obtain the first flow control parameter from the session management network element, which indicates that the access network device does not need to determine the first flow control parameter by itself, simplifies the logic on the access network device side, and improves the efficiency.

[0017] In a possible implementation, the method further includes: sending, by the access network device, capability information of the access network device to the session management network element, wherein the capability information of the access network device includes an air interface transmission rate and / or a buffer size supported by the access network device.

[0018] It can be seen that, in the above embodiments, the access network device can send capability information to the session management network element to help the session management network element determine the first traffic control parameter, thereby reducing the case that the first traffic control parameter determined by the session management network element does not conform to the capability of the access network device, and helping the access network device to better perform congestion determination.

[0019] In a possible implementation, the method further includes: receiving, by the access network device, second information from the session management network element, wherein the second information is used to obtain the capability information of the access network device.

[0020] In a possible implementation, the method further includes: establishing, by the access network device, the first flow table based on queue pair (QP) chaining information of the terminal and QP chaining information of the server.

[0021] It can be seen that, in the above embodiments, the access network device can autonomously establish the first flow table by using the QP chaining information of the terminal and the QP chaining information of the server, to prepare for subsequent sending of the first congestion notification packet message.

[0022] In a possible implementation, the method further includes: receiving, by the access network device, the QP chaining information of the terminal and the QP chaining information of the server from the session management network element.

[0023] In a possible implementation, the method further includes: obtaining, by the access network device, a first message in a data flow of the first PDU session, wherein the first message includes a source address, a destination address, a destination QP field, a source QP field, and a port index, so that the first flow table can be established based on the source address, the destination address, the destination QP field, the source QP field, and the port index. The source address is an address of the terminal, the destination address is an address of the server, the destination QP field is used to indicate a QP number of the server, the source QP field is used to indicate a QP number of the terminal, and the port index indicates a port of the server. Alternatively, the source address is an address of the server, the destination address is an address of the terminal, the destination QP field is used to indicate a QP number of the terminal, the source QP field is used to indicate a QP number of the server, and the port index indicates a port of the terminal.

[0024] It can be seen that, in the above embodiments, the access network device can autonomously establish the first flow table by using the first message in the data flow of the first PDU session, to prepare for subsequent sending of the first congestion notification packet message.

[0025] In a possible implementation, the method further includes: receiving, by the access network device, first indication information from the session management network element, the first indication information being used to instruct the access network device to establish the first flow table.

[0026] In a possible implementation, the method further includes: receiving, by the access network device, the first flow table from the session management network element.

[0027] It can be seen that, in the above embodiments, the access network device can obtain the first flow table from the session management network element, which indicates that the access network device does not need to determine the first flow table by itself, simplifies the logic on the access network device side, and improves the efficiency.

[0028] In a possible implementation, the method further includes: receiving, by the access network device, second indication information from the session management network element, the second indication information being used to instruct the access network device to start traffic control for the first PDU session.

[0029] In a second aspect, a communication method is provided, which can be executed by a session management network element, or can also be executed by a module (for example, a processor, a chip, or a chip system) applied to the session management network element, and can also be implemented by a logical node, a logical module, or software that can implement all or part of the functions of the session management network element. Taking the case that the method is applied to the session management network element, in the method, the session management network element can determine to use the RDMA protocol to transmit a data flow of a first PDU session, and the first PDU session is a session established by a terminal and a server for communication. In this way, the session management network element can send first information to an access network device, the first information being used to determine a first traffic control parameter of the first PDU session, and the first traffic control parameter being used to determine that the data flow of the first PDU session is congested.

[0030] It can be seen that, in the above embodiments, the session management network element, after learning that the RDMA protocol is used to transmit the data flow of the first PDU session, can send first information used to determine the first traffic control parameter to the access network device, so that the access network device can determine that the data flow of the first PDU session is congested based on the first traffic control parameter. That is, the access network device can participate in the traffic control of the wireless RDMA, so that the elimination of congestion is more timely.

[0031] In a possible implementation, the session management network element determining to use the RDMA protocol to transmit the data flow of the first PDU session includes: the session management network element obtaining a request message, the request message being used to instruct to use the RDMA protocol to transmit the data flow of the first PDU session. In this way, the session management network element can determine to use the RDMA protocol to transmit the data flow of the first PDU session based on the request message.

[0032] In a possible implementation, the request message comprises at least one of: a transport type of the RDMA protocol, a protocol version of the RDMA protocol, or a service type of the RDMA protocol.

[0033] In a possible implementation, the session management network element determines, based on the request message, that the data flow of the first PDU session is transmitted by using the RDMA protocol comprises that the session management network element determines, based on the request message and subscription information of the terminal, that the data flow of the first PDU session is transmitted by using the RDMA protocol, the subscription information of the terminal comprising a session type of the first PDU session and / or a protocol version of the RDMA protocol supported by the terminal, the session type of the first PDU session being used to indicate that the first PDU session is a PDU session for transmission based on the RDMA protocol.

[0034] In a possible implementation, the first information is a first QoS requirement corresponding to the first PDU session.

[0035] It can be seen that, in the above embodiments, the session management network element can indicate the first QoS requirement to the access network device, so that the access network device autonomously determines the first traffic control parameter based on the first QoS requirement, thereby making the first traffic control parameter determined by the access network device more meet the requirements of the access network device, and helping the access network device to better perform congestion judgment.

[0036] In a possible implementation, the first information is a first traffic control parameter.

[0037] It can be seen that, in the above embodiments, the session management network element can indicate the first traffic control parameter to the access network device. This indicates that the access network device does not need to determine the first traffic control parameter by itself, simplifies the logic on the access network device side, and improves the efficiency.

[0038] In a possible implementation, the method further comprises: determining, by the session management network element, the first traffic control parameter based on a first QoS requirement corresponding to the first PDU session.

[0039] It can be seen that, in the above embodiments, the session management network element can determine the first traffic control parameter in combination with the first QoS requirement, and thus can indicate the first traffic control parameter to the access network device. This indicates that the access network device does not need to determine the first traffic control parameter by itself, simplifies the logic on the access network device side, and improves the efficiency.

[0040] In a possible implementation, the session management network element determines the first traffic control parameter based on the first QoS requirement comprises that the session management network element determines the first traffic control parameter based on the first QoS requirement and capability information of the access network device, the capability information of the access network device comprising an air interface transmission rate supported by the access network device and / or a buffer size.

[0041] It can be seen that in the above embodiments, the session management network element can determine the first traffic control parameter in combination with the first QoS requirement and the capability information of the access network device, reducing the case that the first traffic control parameter determined by the session management network element does not conform to the capability of the access network device, and helping the access network device to better perform congestion judgment.

[0042] In a possible implementation, the method further includes: receiving, by the session management network element, the capability information of the access network device.

[0043] In a possible implementation, the method further includes: sending, by the session management network element, second information to the access network device, the second information being used to acquire the capability information of the access network device.

[0044] In a possible implementation, the method further includes: acquiring, by the session management network element, QP chaining information of the terminal and QP chaining information of the server, the QP chaining information of the terminal and the QP chaining information of the server being used to establish a first flow table of the first PDU session, the first flow table being used to indicate a forwarding path of a data flow of the first PDU session. In this way, the session management network element can send the QP chaining information of the terminal and the QP chaining information of the server to the access network device.

[0045] It can be seen that in the above embodiments, the session management network element can indicate the QP chaining information of the terminal and the QP chaining information of the server to the access network device, so as to facilitate the access network device to autonomously establish the first flow table based on the QP chaining information of the terminal and the QP chaining information of the server, and prepare for subsequent sending of the first congestion notification packet.

[0046] In a possible implementation, the method further includes: sending, by the session management network element, first indication information to the access network device, the first indication information being used to instruct the access network device to establish the first flow table.

[0047] In a possible implementation, the method further includes: sending, by the session management network element, the first flow table to the access network device.

[0048] In a possible implementation, the method further includes: sending, by the session management network element, second indication information to the access network device, the second indication information being used to instruct the access network device to start traffic control for the first PDU session.

[0049] In a third aspect, a communication apparatus is provided, which comprises means or modules for implementing any of the methods in any of the first aspect to the second aspect. The communication apparatus can be an access network device, or a module (for example, a processor, a chip, or a chip system, etc.) of the access network device, or a logical node, a logical module, or software capable of realizing all or part of the functions of the access network device. Alternatively, the communication apparatus can be a session management network element, or a module (for example, a processor, a chip, or a chip system, etc.) of the session management network element, or a logical node, a logical module, or software capable of realizing all or part of the functions of the session management network element.

[0050] In a fourth aspect, a communication apparatus is provided, which comprises at least one processor; wherein the at least one processor is configured to implement any of the methods in any of the first aspect to the second aspect. The communication apparatus can be an access network device, or a module (for example, a processor, a chip, or a chip system, etc.) of the access network device, or a logical node, a logical module, or software capable of realizing all or part of the functions of the access network device. Alternatively, the communication apparatus can be a session management network element, or a module (for example, a processor, a chip, or a chip system, etc.) of the session management network element, or a logical node, a logical module, or software capable of realizing all or part of the functions of the session management network element. The at least one processor can execute a computer program or instructions in a memory, so that the above method is executed. The memory can be included in the communication apparatus, or located outside the communication apparatus. In addition, the communication apparatus can further comprise an interface.

[0051] In a fifth aspect, a computer readable storage medium is provided, which stores computer instructions, when the computer instructions are executed, causing a computer to execute any of the methods in any of the first aspect to the second aspect.

[0052] In a sixth aspect, a computer program product is provided, which comprises computer program codes, when the computer program codes are run by a computer, causing the computer to execute any of the methods in any of the first aspect to the second aspect.

[0053] In a seventh aspect, a chip is provided, which comprises at least one processor and an interface, the processor being configured to read and execute instructions stored in a memory, when the instructions are run, causing the chip to execute any of the methods in any of the first aspect to the second aspect.

[0054] In an eighth aspect, a communication system is provided, which comprises an access network device for executing any of the methods in the first aspect, and a session management network element for executing any of the methods in the second aspect.

[0055] It should be understood that the second aspect to the eighth aspect of the present application correspond to the technical solutions of the first aspect of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible implementation manners are similar, which will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0056] Fig. 1 is a basic architecture of a communication system provided by an embodiment of the present application;

[0057] Fig. 2 is a flow diagram of a communication method provided by an embodiment of the present application;

[0058] Fig. 3 is a flow diagram of another communication method provided by an embodiment of the present application;

[0059] Fig. 4 is a flow diagram of another communication method provided by an embodiment of the present application;

[0060] Fig. 5 is a flow diagram of another communication method provided by an embodiment of the present application;

[0061] Fig. 6 is a flow diagram of another communication method provided by an embodiment of the present application;

[0062] Fig. 7 is a flow diagram of another communication method provided by an embodiment of the present application;

[0063] Fig. 8 is a structural diagram of a communication apparatus provided by an embodiment of the present application;

[0064] Fig. 9 is a structural diagram of another communication apparatus provided by an embodiment of the present application. DETAILED DESCRIPTION

[0065] The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the embodiments of the present application, the terms "system" and "network" can be used interchangeably. Unless otherwise specified, " / " represents an "or" relationship between the objects before and after the " / " symbol, for example, A / B can represent A or B; in the present application, "and / or" is only used to describe the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent: A alone, A and B together, and B alone, where A and B can be singular or plural. In addition, in the description of the present application, "multiple" means two or more than two. "At least one of the following" or similar expressions means any combination of the items, including any combination of single item or multiple items. For example, at least one of a, b, or c can represent: a, b, c, a-b, a-c, b-c, or a-b-c, where a, b, and c can be one or more. In addition, in order to clearly describe the technical solutions of the embodiments of the present application, in the embodiments of the present application, the same items or similar items with basically the same function are distinguished by "first", "second", etc. The skilled in the art can understand that "first", "second", etc. do not limit the quantity and execution order, and "first", "second", etc. do not necessarily mean different.

[0066] In the embodiments of the present application, the reference to "one embodiment" or "some embodiments" means that the specific features, structures or characteristics described in connection with the embodiment are included in one or more embodiments of the present application. Therefore, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in other some embodiments" and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "include", "contain", "have" and their variants mean "include but not limited to", unless otherwise specifically emphasized.

[0067] The specific embodiments below further illustrate the objectives, technical solutions and beneficial effects of the present application. It should be understood that the following is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made on the basis of the technical solutions of the present application shall be included in the protection scope of the present application.

[0068] In various embodiments of the present application, the terms and / or descriptions among different embodiments are consistent and can be referred to each other if there is no special description and logical conflict. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0069] It should be understood that the technical solutions of the embodiments of the present application can be applied to long term evolution (LTE) architecture, 5th generation mobile networks (5G), 6G communication system, Internet of Things (IoT), wireless local area networks (WLAN) system, vehicle to everything (V2X) communication system, LTE-vehicle (LTE-V), vehicle to vehicle (V2V), Internet of Vehicles, machine type communications (MTC), etc. The technical solutions of the embodiments of the present application can also be applied to future other communication systems, in which the functions may remain the same but the names may change.

[0070] In order to facilitate understanding of the embodiments of the present application, the 5G network architecture shown in FIG. 1 is taken as an example to introduce the communication system, and the specific content can be referred to 3rd generation partnership project (3GPP) technical specifications (TS) 23.501. The functions of each network element and the like can also be referred to other technical specifications of 3GPP. The devices that may be involved in various embodiments of the present application will be briefly described below in conjunction with FIG. 1. As shown in FIG. 1, it includes a terminal part, an access network (AN) part, and a core network part. Optionally, the network architecture can also include a data network (DN) part and / or include an application network element part. The terminal accesses the core network through the access network, and the core network communicates with the data network or the application network element.

[0071] A terminal device, which can also be referred to as a user equipment (UE) or the like, is a device with wireless transceiver function, which can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water (such as ships, etc.); can also be deployed in the air (such as airplanes, balloons and satellites, etc.). The terminal can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal, an augmented reality (AR) terminal, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a wireless terminal in internet of things (IOT), etc.

[0072] The access network part includes access network devices. The access network device is a device that accesses a terminal to a wireless network in a mobile communication system. The access network device, as a node in a radio access network, can also be referred to as an access network element, a base station, a radio access network (RAN) node (or device, or element), an access point (AP), or a network device, etc. The access network device in the embodiments of the present application includes but is not limited to: an evolved universal terrestrial radio access network (E-UTRAN), a next-generation base station (g nodeB, gNB), an evolved node B (eNB), a non-ground network device, a radio network controller (RNC), a node B (NB), a base station controller (BSC), a base transceiver station (BTS), a home base station (for example, a home evolved node B, or a home node B, HNB), a baseband unit (BBU), a wireless fidelity (WiFi) access point, a world interoperability for microwave access (WiMAX) base station, a transmitting and receiving point (TRP), a transmitting point (TP), or a mobile switching center, etc. In systems using different wireless access technologies, the names of devices with base station functions may be different, for example, in a 5G communication system, it is called a RAN or gNB (5G NodeB); in an LTE system, it is called an evolved node B (eNB or eNodeB); in a third generation (3rd generation, 3G) communication system, it is called a node B (Node B), etc. In some deployments of the access network device, the access network device can include a centralized unit (CU) and a distributed unit (DU), etc. In other deployments of the access network device, the CU can also be divided into a CU-control plane (CP) and a CU-user plane (UP), etc.In yet some deployments of the access network device, the access network device can also include a radio unit (RO). In yet some deployments of the access network device, the access network device can be an open radio access network (ORAN) architecture, a cloud RAN, etc. The ORAN can also be referred to as a virtualized RAN. For example, when the access network device is an ORAN architecture, the access network device of the embodiments of the present application can be an access network element in the ORAN, or a module of the access network element, etc. In the ORAN system, the CU can also be referred to as an open (O)-CU, the DU can also be referred to as an O-DU, the CU-CP can also be referred to as an O-CU-CP, the CU-UP can also be referred to as an O-CU-UP, and the RU can also be referred to as an O-RU. For the convenience of description, the CU, the CU-CP, the CU-UP, the DU and the RU are taken as examples for description in the present application. Any one of the CU (or the CU-CP, the CU-UP), the DU and the RU in the present application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0073] The data network is a network outside the mobile communication system, and can provide services for users. For example, the data network can be a packet data network (PDN), such as the Internet, an internet protocol multi-media service (IMS) network, a data network dedicated to some applications, an Ethernet, an internet protocol (IP) local network, etc., and the embodiments of the present application do not limit the data network. A variety of services can be deployed on the data network, and services such as data, voice, short message, etc. can be provided for terminals. There can be multiple application servers (ASs) in the data network, and each AS can provide at least one service.

[0074] The application network element mainly supports interaction with the 3GPP core network to provide services, such as affecting data routing decisions, policy control functions, or providing some services of third parties to the network side. In the 5G communication system, the application network element can be an application function (AF) network element. In future communication systems, the application network element can still be an AF network element, or can also have other names, and the embodiments of the present application do not limit the application network element.

[0075] The network elements in the core network part can be divided into two categories: user plane function network elements (also referred to as user plane network elements for short) and control plane function network elements (also referred to as control plane network elements for short). The control plane function network elements include access management network elements, session management network elements, data management network elements, and policy control network elements, and the like.

[0076] The user plane network element is responsible for forwarding and receiving user data in the terminal. User data can be received from a data network and transmitted to the terminal through an access network device. The user plane network element can also receive user data from the terminal through the access network device and forward it to the data network. In the 5G communication system, the user plane network element can be a user plane function (UPF) network element. In future communication systems, the user plane network element can still be a UPF network element, or it can have other names, which are not limited by the embodiments of the present application.

[0077] The access management network element is a control plane network element provided by an operator network, responsible for access control and mobility management of terminal access to the operator network, including functions such as mobile state management, allocation of user temporary identity, authentication and user management. In the 5G communication system, the access management network element can be an access and mobility management function (AMF) network element. In future communication systems, the access management network element can still be an AMF network element, or it can have other names, which are not limited by the embodiments of the present application.

[0078] The session management network element is mainly responsible for session management in the mobile network, such as session establishment, modification, and release. Specific functions include allocating IP addresses for users, selecting user plane network elements that provide message forwarding functions, and the like. In the 5G communication system, the session management network element can be a session management function (SMF) network element. In future communication systems, the session management network element can still be an SMF network element, or it can have other names, which are not limited by the embodiments of the present application.

[0079] The data management network element is used to generate authentication trust status, user identity processing (such as storing and managing user permanent identity), access control and subscription data management, and the like. In the 5G communication system, the data management network element can be a unified data management (UDM) network element. In future communication systems, the unified data management network element can still be a UDM network element, or it can have other names, which are not limited by the embodiments of the present application.

[0080] The policy control network element mainly supports providing a unified policy framework to control network behavior, providing policy rules to the control layer network function, and being responsible for obtaining user subscription information related to policy decision. In the 5G communication system, the policy control network element can be a policy control function (PCF) network element. In the future communication system, the policy control network element can still be a PCF network element, or can also have other names, which are not limited by the embodiments of the present application.

[0081] Interfaces between a plurality of communication devices in the communication system are also shown in FIG. 1. For example, N1, N2, N3, N4, N5, N6, N7, N8, N10, N11, and N25 in FIG. 1 are interface sequence numbers. The meanings of these interface sequence numbers can be referred to the meanings defined in the 3GPP standard protocol, which are not limited herein.

[0082] It can be understood that the network elements or functions shown in FIG. 1 can be network elements in a hardware device, or software functions running on a dedicated hardware, or virtualized functions instantiated on a platform (for example, a cloud platform), or a combination of the above two. In a possible implementation, the network elements or functions described above can be implemented by one device, or implemented by a plurality of devices together, or implemented by a functional module in one device, and the embodiments of the present application do not make specific limitations. In addition, in the following, in order to facilitate the description, the "network element" can be omitted. For example, the SMF network element in the embodiments of the present application has the same meaning as the SMF, and only the network element is omitted for the convenience of description, and the rest is similar. It should be noted that the embodiments of the present application also do not limit the names of the network elements in the communication system. For example, in different communication systems, the network elements can have other names; for example, when a plurality of network elements are integrated in the same physical device, the physical device can also have other names.

[0083] The embodiments of the present application will be described in detail below in combination with FIG. 1.

[0084] Referring to FIG. 2, FIG. 2 is a flow diagram of a communication method provided by the embodiments of the present application. As shown in FIG. 2, the method includes but is not limited to the following steps:

[0085] 201. The access network device determines that the data flow of the first PDU session is congested based on the first traffic control parameter of the first PDU session, and the first PDU session is a session established by the terminal for communication with the server.

[0086] The first traffic control parameter can be used to determine whether the data flow of the first PDU session is congested. That is, the access network device can determine whether the data flow of the first PDU session is congested based on the first traffic control parameter. For example, the first traffic control parameter can include at least one of the following: an ECN threshold upper limit, an ECN threshold lower limit, and an ECN marking probability. When the number of packets in a queue in the access network device used to buffer the data flow of the first PDU session is greater than or equal to the ECN threshold upper limit, the access network device can mark all the packets in the queue with ECN. When the number of packets in the queue is greater than or equal to the ECN threshold lower limit and less than or equal to the ECN threshold upper limit, the access network device can mark the packets in the queue with ECN based on the ECN marking probability. When the number of packets in the queue is less than or equal to the ECN threshold lower limit, the access network device can not mark the packets in the queue with ECN. The packets marked with ECN in the queue indicate that the data flow of the first PDU session is congested.

[0087] Optionally, the packets marked with ECN can be understood as: the ECN field in the packet header of the packet is marked as (congestion encountered, CE), or the value of the ECN field in the packet header of the packet is 11 or other values. In this case, the packet can be referred to as a CE packet. The specific naming of the packet does not limit the protection scope of the present application.

[0088] The following describes how the access network device obtains the first traffic control parameter.

[0089] For example, the first traffic control parameter can be indicated to the access network device by the session management network element in a direct or indirect manner, or predefined, or preconfigured, or determined by the access network device itself, which is not limited herein.

[0090] For example, the access network device can receive first information from the session management network element, and the first information is used to determine the first traffic control parameter. The following describes several implementation manners of the first information.

[0091] I. The first information is a first QoS requirement corresponding to the first PDU session. This can be regarded as that the first traffic control parameter is indicated to the access network device by the session management network element in an indirect manner. For the access network device, the first traffic control parameter can be determined based on the first QoS requirement. The QoS requirement can include one or more of the following: a default priority value, a delay, a packet loss rate, a burst data size, an average window, and the like.

[0092] The following describes how the access network device determines the first traffic control parameter based on the first QoS requirement.

[0093] The access network device determines the first flow control parameter based on the first QoS requirement and capability information of the access network device. The capability information of the access network device includes an air interface transmission rate supported by the access network device and / or a buffer size.

[0094] The access network device determines the first flow control parameter based on the first QoS requirement and the first correspondence relationship. The first correspondence relationship includes a correspondence relationship between a plurality of QoS requirements and a plurality of flow control parameters, and the correspondence relationship between the plurality of QoS requirements and the plurality of flow control parameters includes a correspondence relationship between the first QoS requirement and the first flow control parameter.

[0095] Optionally, the first correspondence relationship can be indicated to the access network device by the session management network element in a direct or indirect manner, or predefined, or preconfigured, which is not limited herein. For example, the first correspondence relationship is preconfigured in the access network device in the process of establishing a connection between the access network device and the terminal.

[0096] Optionally, the plurality of QoS requirements and the plurality of flow control parameters in the first correspondence relationship can be one-to-one correspondence. For example, the first correspondence relationship can be in the form of a table, such as any row and / or any column therein, and the like, which can be referred to Table 1. In Table 1, QoS requirement 1 corresponds to flow control parameter 1 one-to-one. QoS requirement 2 corresponds to flow control parameter 2 one-to-one, and the rest are similar, which is not described herein.

[0097] Table 1

[0098] II. The first information is the first flow control parameter. This can be regarded as the first flow control parameter being determined by the session management network element and being indicated to the access network device in a direct manner. For the access network device, there is no need to determine the first flow control parameter by itself, which simplifies the logic on the access network device side and improves the efficiency.

[0099] The following describes when the access network device adopts the first flow control parameter to determine that the data flow of the first PDU session is congested.

[0100] For example, the access network device can determine that the data flow of the first PDU session is congested based on the first flow control parameter of the first PDU session when or after the flow control is started for the first PDU session. The access network device can learn that the flow control is started for the first PDU session directly or indirectly. For example, the access network device can receive second indication information from the session management network element, and the second indication information is used to indicate that the access network device starts the flow control for the first PDU session. Alternatively, the access network device does not receive the second indication information, and the access network device can determine that the flow control is started for the first PDU session based on the first information. That is, because the first information is used to determine the first flow control parameter, the access network device can start the flow control for the first PDU session when or after the first information is received. For example, for the scenario that the first QoS requirement corresponds to the first flow control parameter, the access network device can start the flow control for the first PDU session when or after the first QoS requirement is received.

[0101] The first PDU session is introduced below.

[0102] The first PDU session is a data bearer established between the terminal and the user plane network element, and is used to provide connection services for communication between the terminal and the visited network. In other words, the first PDU session is a session established for the terminal to communicate with the server. The server can be exchanged with the application network element. For ease of description, the server is taken as an example for introduction, which should not be regarded as a limitation to the present application.

[0103] Optionally, the creation process of the first PDU session can be initiated by the terminal or other devices, which is not limited in the present application.

[0104] As an example, for uplink transmission, the data flow of the first PDU session can be an uplink data flow, that is, the packet in the data flow of the first PDU session comes from the terminal. In other words, the terminal can transmit the packet in the sending QP to the server through the first PDU session, so that the server can cache the packet. In this case, the source address included in the packet in the data flow of the first PDU session is the address of the terminal, the destination address included in the packet is the address of the server, the destination QP (Dest QP) field included in the packet is used to indicate the QP number of the server, the source QP (source QP) field included in the packet is used to indicate the QP number of the terminal, and the port indicated by the port index included in the packet is the port of the server.

[0105] As another example, for downlink transmission, the data flow of the first PDU session can be a downlink data flow, i.e., the packet in the data flow of the first PDU session comes from the server. In other words, the server can transmit the packet in the sending QP to the terminal through the first PDU session, so that the terminal caches the packet in the receiving QP. In this case, the source address included in the packet in the data flow of the first PDU session is the address of the server, the destination address included in the packet is the address of the terminal, the destination QP field included in the packet is used to indicate the QP number of the terminal, the source QP field included in the packet is used to indicate the QP number of the server, and the port indicated by the port index included in the packet is the port of the terminal.

[0106] Optionally, in this application, the source address, the destination address, the destination QP field, the source QP field and the port index can be located in the packet header of the packet in the data flow of the first PDU session or any other location, which is not limited herein.

[0107] In this application, the source address and the destination address can both be an internet protocol (IP) address or other address, which is not limited herein. For example, the source address is the IP address of the terminal, and the destination address is the IP address of the server. Alternatively, the source address is the IP address of the server, and the destination address is the IP address of the terminal.

[0108] In this application, the QP number can also be referred to as QP number identification, which is used to uniquely identify the QP. The QP can include a sending QP and a receiving QP.

[0109] In this application, the port index can include a local identification (LID) of the port. Optionally, the port index can also include a global identification (GID).

[0110] 202. The access network device sends a first congestion notification packet based on a first flow table of the first PDU session, the first flow table being used to indicate a forwarding path of the data flow of the first PDU session, and the first congestion notification packet being used to notify that the data flow of the first PDU session is congested.

[0111] In this application, the first flow table is used to store one or more table entries. The table entries in the first flow table can include the source address, the destination address, the destination QP number, the source QP number and the port index. Optionally, the table entries in the first flow table can also include the corresponding relationship between the source address, the destination address, the destination QP number, the source QP number and the port index.

[0112] For example, the first flow table can be in the form of a table, such as any row and / or any column in the table, and the like, which can be referred to Table 2. In Table 2, IP address 1, IP address A, QP number 1, QP number A and port index 1 can be regarded as a table entry, and the rest are similar, which will not be described here.

[0113] Table 2

[0114] The following describes how the access network device obtains the first flow table.

[0115] For example, the first flow table can be indicated to the access network device by the session management network element in a direct or indirect manner, or predefined, or preconfigured, or determined by the access network device itself, which is not limited here.

[0116] For example, the access network device establishes the first flow table based on the terminal's QP chaining information and the server's QP chaining information. Alternatively, the access network device obtains a first packet in a first PDU session data flow, and the first packet includes a source address, a destination address, a destination QP field, a source QP field and a port index, so that the first flow table can be established based on the source address, the destination address, the destination QP field, the source QP field and the port index. Alternatively, the access network device receives the first flow table from the session management network element.

[0117] The terminal's QP chaining information includes at least one of the following: the terminal's address, the terminal's port index, or the terminal's QP number, and the server's QP chaining information includes at least one of the following: the server's address, the server's port index, or the server's QP number.

[0118] Optionally, the terminal's QP chaining information and / or the server's QP chaining information can be indicated to the access network device by some device in a direct or indirect manner. For example, the access network device can obtain the terminal's QP chaining information and the server's QP chaining information from the session management network element. Alternatively, the access network device can obtain the terminal's QP chaining information from the terminal, and the access network device can obtain the server's QP chaining information from the session management network element. The present application does not limit this.

[0119] The first packet includes a source address, a destination address, a destination QP field, a source QP field, and a port index. The source address, the destination address, the destination QP field, the source QP field, and the port index can be included in a header of the first packet or other positions of the first packet. The application does not limit the source address, the destination address, the destination QP field, the source QP field, and the port index. For uplink transmission, the first packet is from the terminal. The source address of the first packet is the address of the terminal, the destination address of the first packet is the address of the server, the destination QP field of the first packet is used to indicate the QP number of the server, the source QP field of the first packet is used to indicate the QP number of the terminal, and the port index of the first packet is used to indicate the port of the server. For downlink transmission, the first packet is from the server. The source address of the first packet is the address of the server, the destination address of the first packet is the address of the terminal, the destination QP field of the first packet is used to indicate the QP number of the terminal, the source QP field of the first packet is used to indicate the QP number of the server, and the port index of the first packet is used to indicate the port of the terminal.

[0120] Optionally, for the scheme in which the first flow table is determined by the access network device, the access network device establishes the first flow table based on the QP chaining information of the terminal and the QP chaining information of the server. Alternatively, the access network device establishes the first flow table based on the source address, the destination address, the destination QP field, the source QP field, and the port index in the first packet. The access network device can know to establish the first flow table in a direct or indirect manner. For example, the access network device can receive first indication information from the session management network element, and the first indication information is used to instruct the access network device to establish the first flow table. Alternatively, the access network device obtains the QP chaining information of the terminal and / or the QP chaining information of the server from the session management network element, and the QP chaining information of the terminal and the QP chaining information of the server can be used to establish the first flow table. Therefore, the access network device can know to establish the first flow table in such a manner.

[0121] Optionally, for the scheme in which the first flow table is indicated to the access network device by the session management network element in a direct manner, the access network device receives the first flow table from the session management network element. For this case, the session management network element can establish the first flow table based on the QP chaining information of the terminal and the QP chaining information of the server, and then send the first flow table to the access network device.

[0122] The following describes that the access network device sends the first congestion notification packet based on the first flow table of the first PDU session.

[0123] As an example, for uplink transmission, the access network device sends a first congestion notification packet message to the terminal based on the first flow table. In this case, the source address included in the first congestion notification packet message is the address of the server, the destination address included in the first congestion notification packet message is the address of the terminal, the destination QP field included in the first congestion notification packet message is used to indicate the QP number of the terminal, the source QP field included in the first congestion notification packet message is used to indicate the QP number of the server, and the port indicated by the port index included in the first congestion notification packet message is the port of the terminal. When the terminal receives the first congestion notification packet message, the terminal can adjust the sending rate of the messages in the data flow of the first PDU session, such as reducing the sending rate.

[0124] As another example, for downlink transmission, the access network device sends a first congestion notification packet message to the server based on the first flow table. In this case, the source address included in the first congestion notification packet message is the address of the terminal, the destination address included in the first congestion notification packet message is the address of the server, the destination QP field included in the first congestion notification packet message is used to indicate the QP number of the server, the source QP field included in the first congestion notification packet message is used to indicate the QP number of the terminal, and the port indicated by the port index included in the first congestion notification packet message is the port of the server. When the server receives the first congestion notification packet message, the server can adjust the sending rate of the messages in the data flow of the first PDU session, such as reducing the sending rate.

[0125] Referring to FIG. 3, FIG. 3 is a flow diagram of another communication method according to an embodiment of the present disclosure. The embodiment shown in FIG. 3 can be combined with the embodiment shown in FIG. 2, for example, the embodiment shown in FIG. 2 further includes the following steps:

[0126] 301. The session management network element determines to use the RDMA protocol to transmit the data flow of the first PDU session, and the first PDU session is a session established by the terminal and the server for communication.

[0127] For example, the session management network element can obtain a request message, so as to determine to use the RDMA protocol to transmit the data flow of the first PDU session based on the request message. In a possible implementation, the session management network element can receive a request message from the terminal, and the request message can be a PDU session establishment request or a PDU session modification request. In another possible implementation, the session management network element can receive a request message from the server, and the request message can be a PDU session modification request.

[0128] Optionally, the request message is used to indicate that the data flow of the first PDU session is transmitted by using the RDMA protocol. The session management network element can know that the terminal or the server requests that the data flow of the first PDU session is transmitted by using the RDMA protocol through the indication shown in the request message or the implicit indication. As an example, the request message includes at least one of the following: a transmission type of the RDMA protocol, a protocol version of the RDMA protocol, or a service type of the RDMA protocol, and the request message further includes third indication information used to indicate that the data flow of the first PDU session is transmitted by using the RDMA protocol. That is, the session management network element can know that the terminal or the server requests that the data flow of the first PDU session is transmitted by using the RDMA protocol through the third indication information, or know that the terminal or the server requests that the data flow of the first PDU session is transmitted by using the RDMA protocol through at least one of the following: the transmission type of the RDMA protocol, the protocol version of the RDMA protocol, and the service type of the RDMA protocol. As another example, the request message includes at least one of the following: the transmission type of the RDMA protocol, the protocol version of the RDMA protocol, or the service type of the RDMA protocol, and the request message does not include the third indication information. That is, the session management network element knows that the terminal or the server requests that the data flow of the first PDU session is transmitted by using the RDMA protocol through at least one of the following: the transmission type of the RDMA protocol, the protocol version of the RDMA protocol, and the service type of the RDMA protocol.

[0129] The transmission type of the RDMA protocol can include lossless and / or lossy. The protocol version of the RDMA protocol can include at least one of the following: iwarp, Infiniband (IB), or remote direct memory access over converged Ethernet (ROCE). The service type of the RDMA protocol can include at least one of the following: unreliable datagram (UD), reliable datagram (RD), unreliable connection (UC), or reliable connection (RC).

[0130] The following describes that the session management network element determines that the data flow of the first PDU session is transmitted by using the RDMA protocol based on the request message.

[0131] For example, the session management network element can determine to transmit the data flow of the first PDU session by using the RDMA protocol based on the request message and the subscription information of the terminal. Optionally, the session management network element can also determine to transmit the data flow of the first PDU session by using the RDMA protocol based on the session (SM) policy information.

[0132] The session management network element can obtain the subscription information of the terminal from the unified data management network element. For example, the request message can also include the identifier of the terminal, and the session management network element can obtain the subscription information of the terminal from the unified data management network element based on the identifier of the terminal.

[0133] The 'identifier of the terminal' mentioned in the present application can be a user identifier used to uniquely identify the terminal, such as one or more of the following: system architecture evolution temporary mobile station identifier (S-TMSI), globally unique temporary identity (GUTI), subscription permanent identifier (SUPI), subscription concealed identifier (SUCI), international mobile subscriber identification number (IMSI), radio network temporary identifier (RNTI), generic public subscription identifier (GPSI), external identifier, mobile subscriber ISDN number (MSISDN), etc., without limitation. Optionally, the ISDN refers to an integrated service digital network (ISDN), an international mobile equipment identify (IMEI), or other application layer identifier, without limitation.

[0134] The subscription information of the terminal includes a session type of the first PDU session and / or a protocol version of an RDMA protocol supported by the terminal. The session type of the first PDU session is used to indicate that the first PDU session is a PDU session for transmission based on the RDMA protocol. The protocol version of the RDMA protocol supported by the terminal includes at least one of the following: iwarp, IB, or ROCE.

[0135] Optionally, the protocol version of the RDMA protocol included in the request message can be partially the same, completely the same, or different from the protocol version of the RDMA protocol included in the subscription information of the terminal. When the protocol version of the RDMA protocol included in the request message is partially the same as the protocol version of the RDMA protocol included in the subscription information of the terminal, the session management network element can use the protocol version of the RDMA protocol in the request message that is the same as the protocol version of the RDMA protocol in the subscription information of the terminal to transmit the data flow of the first PDU session. When the protocol version of the RDMA protocol included in the request message is completely the same as the protocol version of the RDMA protocol included in the subscription information of the terminal, the session management network element can use the protocol version of the RDMA protocol in the request message to transmit the data flow of the first PDU session. When the protocol version of the RDMA protocol included in the request message is different from the protocol version of the RDMA protocol included in the subscription information of the terminal, the session management network element can use the protocol version of the RDMA protocol in the subscription information of the terminal to transmit the data flow of the first PDU session.

[0136] The session management network element can obtain the SM policy information from the policy control network element. For example, the session management network element can obtain the SM policy information from the policy control network element based on the identifier of the terminal. Optionally, the SM policy information can be used to determine the first QoS requirement of the first PDU session. For example, the SM policy information can include quality of service enforcement rules (QER). In this way, the session management network element can generate the first QoS requirement based on the QER.

[0137] 302. The session management network element can send first information to the access network device, the first information being used to determine a first flow control parameter of the first PDU session, the first flow control parameter being used to determine that the data flow of the first PDU session is congested.

[0138] The first information, the first flow control parameter, and the like can refer to the related description of FIG. 2, and will not be described here.

[0139] Optionally, in the case where the first information is the first flow control parameter, the session management network element can determine the first flow control parameter. For example, the session management network element can determine the first flow control parameter based on the first QoS requirement corresponding to the first PDU session.

[0140] Optionally, the session management network element determines the first traffic control parameter based on the first QoS requirement, comprising: the session management network element determines the first traffic control parameter based on the first QoS requirement and the capability information of the access network device.

[0141] The capability information of the access network device can be indicated by the access network device to the session management network element in a direct or indirect manner, or predefined, or preconfigured, which is not limited herein. For example, the session management network element can receive the capability information of the access network device. It should be understood that the session management network element can actively request the capability information of the access network device from the access network device. For example, the session management network element can send second information to the access network device, so that the access network device sends the capability information of the access network device to the session management network element based on the second information. Alternatively, the session management network element does not send any information, such as the second information. That is, the session management network element passively receives the capability information of the access network device. That is, the access network device does not receive the second information and actively sends the capability information of the access network device to the session management network element. The second information is used to obtain the capability information of the access network device.

[0142] The method embodiments shown in FIGS. 2 and 3 include many possible implementation schemes. Some implementation schemes will be described below with reference to any one of FIGS. 4 to 7. In any one of FIGS. 4 to 7, the terminal is UE, the access network device is RAN, the session management network element is SMF, the unified data management network element is UDM, the policy control network element is SMF, and the server is AS. The related concepts or operations or logical relationships not explained in any one of FIGS. 4 to 7 can refer to the corresponding descriptions in the embodiments shown in FIGS. 2 and 3, and thus will not be described again.

[0143] Referring to FIG. 4, FIG. 4 is a flow diagram of another communication method provided by the embodiments of the present application. The method includes but is not limited to the following steps:

[0144] 401. The UE sends a request message to the SMF, the request message being used to indicate that the data flow of the first PDU session is transmitted by using the RDMA protocol, and the first PDU session being a session established by the UE for communication with the AS.

[0145] Correspondingly, the SMF receives the request message from the UE. The request message can refer to the related description of FIG. 3, which will not be described again herein.

[0146] 402. The SMF obtains the subscription information of the UE from the UDM.

[0147] The step 402 can refer to the related description of FIG. 3, which will not be described again herein.

[0148] The step 402 is an optional step.

[0149] 403. The SMF obtains the SM policy information from the PCF.

[0150] The step 403 can refer to the description of FIG. 3, and will not be repeated here. Optionally, the SM policy information can be carried in a session management policy association establishment (SM policy association establishment) message or a SM policy association modification message. When the request message in the step 401 is a PDU session establishment request message, the SM policy information is carried in the SM policy association establishment message. When the request message is a PDU session modification request message, the SM policy information is carried in the SM policy association modification message.

[0151] The step 403 is an optional step.

[0152] 404. The SMF determines to transmit the data flow of the first PDU session by using the RDMA protocol based on the request message, the subscription information of the UE, and the SM policy information.

[0153] The step 404 can refer to the description of FIG. 3, and will not be repeated here.

[0154] 405. The SMF obtains the QP link information of the UE.

[0155] For example, the SMF can obtain the QP link information of the UE from the UE. The QP link information of the UE can refer to the description of the step 202 of FIG. 2, and will not be repeated here.

[0156] Optionally, the SMF can also obtain the address of the AS from the UE.

[0157] 406. The SMF obtains the QP link information of the AS.

[0158] As an example, the SMF can obtain the QP link information of the AS from the AS. For example, the SMF can send a link request message to the AS based on the address of the AS, and the link request message includes part or all of the information in the QP link information of the UE, such as at least one of the address of the UE, the port index of the UE, or the QP number of the UE. In this way, the AS can send the QP link information of the AS to the SMF based on the link request message.

[0159] The QP link information of the AS can refer to the description of FIG. 2, and will not be repeated here.

[0160] 407、The SMF sends, to the RAN, second indication information, first QoS requirement corresponding to the first PDU session, UE’s QP establishment information and AS’s QP establishment information, the second indication information being used to instruct the RAN to start traffic control for the first PDU session.

[0161] Correspondingly, the RAN receives, from the SMF, the second indication information, the first QoS requirement corresponding to the first PDU session, the UE’s QP establishment information and the AS’s QP establishment information. As to the first QoS requirement, please refer to the description of FIG. 2, which will not be repeated here.

[0162] 408、The RAN determines, based on the first QoS requirement, first traffic control parameter of the first PDU session.

[0163] As to the step 408, please refer to the description of FIG. 2, which will not be repeated here.

[0164] 409、The RAN establishes, based on the UE’s QP establishment information and the AS’s QP establishment information, first flow table of the first PDU session, the first flow table being used to indicate forwarding path of data flow of the first PDU session.

[0165] As to the first flow table, please refer to the description of Table 2, which will not be repeated here.

[0166] 410、The UE and the AS perform interaction of the QP establishment information, and establish RDMA connection.

[0167] As an example, the UE can obtain the AS’s QP establishment information. For example, the UE obtains the AS’s QP establishment information through the SMF. The AS obtains the UE’s QP establishment information. For example, the AS obtains the UE’s QP establishment information through the SMF. This indicates that the UE and the AS perform interaction of the QP establishment information, thereby establishing the RDMA connection.

[0168] 411、The UE and the AS transmit data flow of the first PDU session.

[0169] For example, the UE and the AS transmit downlink data flow and / or uplink data flow of the first PDU session.

[0170] 412、The RAN determines, based on the first traffic control parameter, that data flow of the first PDU session occurs congestion.

[0171] Optionally, the RAN can configure a processing rule of the packets in the data flow of the first PDU session based on the first traffic control parameter. The processing rule of the packets in the data flow of the first PDU session can include at least one of the following: determining whether to ECN mark the packets in a queue in the RAN for buffering the data flow of the first PDU session based on the first traffic control parameter, sending a congestion notification packet based on the packets in the queue being ECN marked, and the like.

[0172] Optionally, the RAN can determine whether to ECN mark the packets in the queue for buffering the data flow of the first PDU session based on the first traffic control parameter. For example, when the number of the packets in the queue is greater than or equal to the upper ECN threshold, the RAN can ECN mark all the packets in the queue. When the number of the packets in the queue is greater than or equal to the lower ECN threshold and less than or equal to the upper ECN threshold, the RAN can ECN mark the packets in the queue based on an ECN marking probability. When the number of the packets in the queue is less than or equal to the lower ECN threshold, the RAN can not ECN mark the packets in the queue. The packets in the queue being ECN marked indicate that the data flow of the first PDU session is congested. In this way, the RAN can send a congestion notification packet based on the packets in the queue being ECN marked. For example, the RAN can send the congestion notification packet based on a ratio of the number of the packets in the queue being ECN marked to the number of the packets in the queue not being ECN marked, or a ratio of the number of the packets in the queue being ECN marked to the total number of the packets in the queue, and the like.

[0173] After step 412, there are two implementation manners, implementation manner 1 includes step 413 and step 414, and implementation manner 2 includes step 415 and step 416.

[0174] 413. The RAN sends a first congestion notification packet to the UE based on the first flow table, the first congestion notification packet being used to notify that the data flow of the first PDU session is congested.

[0175] Correspondingly, the UE or the AS receives the first congestion notification packet from the RAN. When the UE receives the first congestion notification packet, step 414 can be performed.

[0176] Step 413 can refer to the related description of FIG. 2, and will not be described here.

[0177] 414. The UE adjusts a sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet.

[0178] For example, the UE reduces the sending rate of the packets in the data flow of the first PDU session.

[0179] In the present application, the manner in which the UE reduces the sending rate of the packets in the data flow of the first PDU session can refer to an existing scheme, such as the reduction of the sending rate of the packets in the data flow of the first PDU session in an existing version of a communication standard. Alternatively, the reduction of the sending rate of the packets in the data flow of the first PDU session in a future communication standard.

[0180] For example, the UE can gradually reduce the sending rate based on the number of first CNP packets received in a first unit of time. Conversely, if no first CNP packet is received in a second unit of time, the sending rate is gradually increased until a specified maximum rate. The lengths of the first unit of time and the second unit of time can be the same or different, which is not limited in the present application.

[0181] 415. The RAN sends a first congestion notification packet message to the AS based on the first flow table, and the first congestion notification packet message is used to notify that the data flow of the first PDU session is congested.

[0182] Correspondingly, the AS receives the first congestion notification packet message from the RAN. When the AS receives the first congestion notification packet message, step 416 can be performed.

[0183] 416. The AS adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0184] For example, the AS reduces the sending rate of the packets in the data flow of the first PDU session.

[0185] In the present application, the manner in which the AS reduces the sending rate of the packets in the data flow of the first PDU session can refer to an existing scheme, such as the reduction of the sending rate of the packets in the data flow of the first PDU session in an existing version of a communication standard. Alternatively, the reduction of the sending rate of the packets in the data flow of the first PDU session in a future communication standard.

[0186] For example, the AS can gradually reduce the sending rate based on the number of first CNP packets received in a first unit of time. Conversely, if no first CNP packet is received in a second unit of time, the sending rate is gradually increased until a specified maximum rate. The lengths of the first unit of time and the second unit of time can be the same or different, which is not limited in the present application.

[0187] It can be seen that in the above embodiments, the first traffic control parameter and the first flow table are both determined by the RAN in combination with the corresponding information from the SMF, so that the RAN can determine by itself whether the data flow of the first PDU session is congested based on the first traffic control parameter, and can send the first congestion notification packet message based on the first flow table in the case that the data flow of the first PDU session is congested, and then perform traffic control in a wireless communication scenario by using the RDMA technology, such as reducing the queue backlog on the congested side. This can guarantee the low latency of the service, does not affect the throughput of the service, and improves the performance and quality of the service. In addition, the determination of whether the data flow of the first PDU session is congested and the sending of the first congestion notification packet message are both performed by the RAN, which can reduce the transmission delay of the air interface twice, can realize more timely wireless RDMA traffic control, and makes the elimination of congestion more timely.

[0188] Referring to FIG. 5, FIG. 5 is a flowchart of another communication method provided by the embodiments of the present application. The method includes but is not limited to the following steps:

[0189] 501. The UE sends a request message to the SMF, the request message being used to indicate that the data flow of the first PDU session is transmitted by using the RDMA protocol, the first PDU session being a session established by the UE for communication with the AS.

[0190] Correspondingly, the SMF receives the request message from the UE. Wherein, the request message can refer to the related description of FIG. 3, which will not be repeated here.

[0191] 502. The SMF obtains the subscription information of the UE from the UDM.

[0192] Wherein, the step 502 can refer to the related description of FIG. 3, which will not be repeated here.

[0193] Wherein, the step 502 is an optional step.

[0194] 503. The SMF obtains the SM policy information from the PCF.

[0195] Wherein, the step 503 is similar to the step 403 of FIG. 4, which will not be repeated here.

[0196] Wherein, the step 503 is an optional step.

[0197] 504. The SMF determines that the data flow of the first PDU session is transmitted by using the RDMA protocol based on the request message, the subscription information of the UE and the SM policy information.

[0198] Wherein, the step 504 can refer to the related description of FIG. 3, which will not be repeated here.

[0199] 505、The SMF sends first indication information, second indication information and first QoS requirement corresponding to the first PDU session to the RAN, the first indication information is used to instruct the RAN to establish a first flow table, and the second indication information is used to instruct the RAN to start traffic control for the first PDU session.

[0200] Correspondingly, the RAN receives the first indication information, the second indication information and the first QoS requirement from the SMF. Wherein, the first QoS requirement can refer to the description related to FIG. 2, and details are not repeated here.

[0201] 506、The RAN determines a first traffic control parameter of the first PDU session based on the first QoS requirement.

[0202] Wherein, the step 506 can refer to the description related to FIG. 2, and details are not repeated here.

[0203] 507、The UE and the AS perform interaction of QP link establishment information to establish an RDMA connection.

[0204] Wherein, the step 507 is similar to the step 410 of FIG. 4, and details are not repeated here.

[0205] 508、The UE and the AS transmit a data stream of the first PDU session, and the RAN obtains a first packet in the data stream of the first PDU session, the first packet includes a source address, a destination address, a destination QP field, a source QP field and a port index, and a first flow table is established based on the source address, the destination address, the destination QP field, the source QP field and the port index.

[0206] Wherein, the 'UE and the AS transmit a data stream of the first PDU session' is similar to the step 411 of FIG. 4, and details are not repeated here. The first flow table can refer to the description related to FIG. 2, and details are not repeated here.

[0207] 509、The RAN determines that the data stream of the first PDU session is congested based on the first traffic control parameter.

[0208] Wherein, the step 509 can refer to the step 412 of FIG. 4, and details are not repeated here.

[0209] Wherein, after the step 509, there are two implementation manners, the implementation manner 1 includes the step 510 and the step 511, and the implementation manner 2 includes the step 512 and the step 513.

[0210] 510、The RAN sends a first congestion notification packet message to the UE based on the first flow table, the first congestion notification packet message is used to notify that the data stream of the first PDU session is congested.

[0211] Correspondingly, the UE or the AS receives the first congestion notification packet message from the RAN. When the UE receives the first congestion notification packet message, step 511 can be performed.

[0212] Step 510 can refer to the related description of FIG. 2 and will not be repeated here.

[0213] 511. The UE adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0214] For example, the UE reduces the sending rate of the packets in the data flow of the first PDU session.

[0215] 512. The RAN sends a first congestion notification packet message to the AS based on the first flow table, and the first congestion notification packet message is used to notify that the data flow of the first PDU session is congested.

[0216] Correspondingly, the AS receives the first congestion notification packet message from the RAN. When the AS receives the first congestion notification packet message, step 513 can be performed.

[0217] Step 513 can refer to the related description of FIG. 2 and will not be repeated here.

[0218] 513. The AS adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0219] For example, the AS reduces the sending rate of the packets in the data flow of the first PDU session.

[0220] It can be seen that in the above embodiments, the first flow control parameter is determined by the RAN in combination with the corresponding information from the SMF, and the first flow table is determined by the RAN reading the packet header of the first packet. Therefore, when the RAN determines that the data flow of the first PDU session is congested based on the first flow control parameter, the RAN can send the first congestion notification packet message based on the first flow table, and then perform flow control in the wireless communication scenario using the RDMA technology, such as reducing the queue backlog on the congested side. This can guarantee the low latency of the service, does not affect the throughput of the service, and improves the performance and quality of the service. In addition, the determination of the congestion of the data flow of the first PDU session and the sending of the first congestion notification packet message are both performed by the RAN, which can reduce the transmission delay of the two air interfaces, can realize more timely wireless RDMA flow control, and can eliminate the congestion more timely.

[0221] Referring to FIG. 6, FIG. 6 is a flowchart of another communication method provided by an embodiment of the present application. The method includes but is not limited to the following steps:

[0222] 601、In the process of establishing a connection between the RAN and the UE, a first correspondence relationship is preconfigured in the RAN, the first correspondence relationship includes a correspondence relationship between a plurality of QoS requirements and a plurality of traffic control parameters, and the correspondence relationship between the plurality of QoS requirements and the plurality of traffic control parameters includes a correspondence relationship between a first QoS requirement of a first PDU session and a first traffic control parameter of the first PDU session.

[0223] 602、The UE sends a request message to the SMF, the request message being used to indicate that the data flow of the first PDU session is transmitted in the RDMA protocol, and the first PDU session is a session established by the UE for communication with the AS.

[0224] Correspondingly, the SMF receives the request message from the UE. Wherein, the request message can refer to the related description of FIG. 3, and will not be repeated here.

[0225] 603、The SMF obtains the subscription information of the UE from the UDM.

[0226] Wherein, the step 603 can refer to the related description of FIG. 3, and will not be repeated here.

[0227] Wherein, the step 603 is an optional step.

[0228] 604、The SMF obtains the SM policy information from the PCF.

[0229] Wherein, the step 604 is similar to the step 403 of FIG. 4, and will not be repeated here.

[0230] Wherein, the step 604 is an optional step.

[0231] 605、The SMF determines that the data flow of the first PDU session is transmitted in the RDMA protocol based on the request message, the subscription information of the UE and the SM policy information.

[0232] 606、The SMF obtains the QP connection information of the UE.

[0233] Wherein, the step 606 is similar to the step 405 of FIG. 4, and will not be repeated here.

[0234] 607、The SMF obtains the QP connection information of the AS.

[0235] Wherein, the step 607 is similar to the step 406 of FIG. 4, and will not be repeated here.

[0236] 608、The SMF sends the first QoS requirement, the QP connection information of the UE and the QP connection information of the AS to the RAN.

[0237] Correspondingly, the RAN receives the first QoS requirement, the UE's QP establishment information and the AS's QP establishment information from the SMF. The first QoS requirement can refer to the description of FIG. 2, and will not be repeated here.

[0238] In the embodiment shown in FIG. 6, the first QoS requirement corresponds to the first traffic control parameter, so that the RAN can determine to start traffic control for the first PDU session according to the first QoS requirement.

[0239] Optionally, the SMF can also send second indication information to the RAN, the second indication information being used to instruct the RAN to start traffic control for the first PDU session.

[0240] 609. The RAN determines the first traffic control parameter based on the first QoS requirement and the first correspondence.

[0241] 610. The RAN establishes a first flow table of the first PDU session based on the UE's QP establishment information and the AS's QP establishment information, the first flow table being used to indicate a forwarding path of a data flow of the first PDU session.

[0242] The first flow table can refer to the description of FIG. 2, and will not be repeated here.

[0243] 611. The UE and the AS perform interaction of the QP establishment information to establish an RDMA connection.

[0244] As an example, the UE can obtain the AS's QP establishment information. For example, the UE obtains the AS's QP establishment information through the SMF. The AS obtains the UE's QP establishment information. For example, the AS obtains the UE's QP establishment information through the SMF. This indicates that the UE and the AS perform interaction of the QP establishment information to establish an RDMA connection.

[0245] 612. The UE and the AS transmit a data flow of the first PDU session.

[0246] For example, the UE and the AS transmit a downlink data flow and / or an uplink data flow of the first PDU session.

[0247] 613. The RAN determines that the data flow of the first PDU session is congested based on the first traffic control parameter.

[0248] The step 613 can refer to the step 412 of FIG. 4, and will not be repeated here.

[0249] After the step 613, there are two implementation manners, implementation manner 1 includes steps 614 and 615, and implementation manner 2 includes steps 616 and 617.

[0250] 614、The RAN sends, to the UE, a first congestion notification packet message based on the first flow table, where the first congestion notification packet message is used to notify that the data flow of the first PDU session is congested.

[0251] Correspondingly, the UE or the AS receives the first congestion notification packet message from the RAN. When the UE receives the first congestion notification packet message, step 615 can be performed.

[0252] Step 614 can refer to the related description in FIG. 2, and will not be repeated here.

[0253] 615、The UE adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0254] For example, the UE reduces the sending rate of the packets in the data flow of the first PDU session.

[0255] 616、The RAN sends, to the AS, a first congestion notification packet message based on the first flow table, where the first congestion notification packet message is used to notify that the data flow of the first PDU session is congested.

[0256] Correspondingly, the AS receives the first congestion notification packet message from the RAN. When the AS receives the first congestion notification packet message, step 616 can be performed.

[0257] Step 616 can refer to the related description in FIG. 2, and will not be repeated here.

[0258] 617、The AS adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0259] For example, the AS reduces the sending rate of the packets in the data flow of the first PDU session.

[0260] It can be seen that, in the above embodiments, the first traffic control parameter is determined by the RAN in combination with the corresponding information from the SMF and the first correspondence relationship, and the first flow table is determined by the RAN in combination with the corresponding information from the SMF, so that when the RAN judges that the data flow of the first PDU session is congested based on the first traffic control parameter, the RAN can send the first congestion notification packet message based on the first flow table, and then perform traffic control in the wireless communication scenario by using the RDMA technology, such as reducing the queue backlog on the congested side. This can guarantee the low delay of the service, does not affect the throughput of the service, and improves the performance and quality of the service. In addition, the judgment that the data flow of the first PDU session is congested and the sending of the first congestion notification packet message are both performed by the RAN, which can reduce the transmission delay of the air interface twice, can realize more timely wireless RDMA traffic control, and makes the elimination of congestion more timely.

[0261] Referring to FIG. 7, FIG. 7 is a flow diagram of another communication method provided by the embodiments of the present application. The method includes but is not limited to the following steps:

[0262] 701. The UE sends a request message to the SMF, the request message being used to indicate that the data flow of the first PDU session is transmitted by using the RDMA protocol, the first PDU session being a session established by the UE for communicating with the AS.

[0263] Correspondingly, the SMF receives the request message from the UE. Wherein, the request message can refer to the related description of FIG. 3, and will not be repeated here.

[0264] 702. The SMF obtains the subscription information of the UE from the UDM.

[0265] Wherein, the step 702 can refer to the related description of FIG. 3, and will not be repeated here.

[0266] Wherein, the step 702 is an optional step.

[0267] 703. The SMF obtains the SM policy information from the PCF.

[0268] Wherein, the step 703 is similar to the step 403 of FIG. 4, and will not be repeated here.

[0269] Wherein, the step 703 is an optional step.

[0270] 704. The SMF determines that the data flow of the first PDU session is transmitted by using the RDMA protocol based on the request message, the subscription information of the UE and the SM policy information.

[0271] Wherein, the step 704 can refer to the related description of FIG. 3, and will not be repeated here.

[0272] 705. The SMF obtains the QP connection information of the UE.

[0273] Wherein, the step 705 is similar to the step 405 of FIG. 4, and will not be repeated here.

[0274] 706. The SMF obtains the QP connection information of the AS.

[0275] Wherein, the step 706 is similar to the step 406 of FIG. 4, and will not be repeated here.

[0276] 707. The SMF obtains the capability information of the RAN, the capability information of the RAN including the air interface transmission rate and / or the buffer size supported by the RAN.

[0277] Wherein, the step 707 can refer to the related description of FIG. 3, and will not be repeated here.

[0278] 708、The SMF determines, based on the capability information of the RAN and the first QoS requirement corresponding to the first PDU session, a first traffic control parameter of the first PDU session, and determines, based on the UE's QP establishment information and the AS's QP establishment information, a first flow table of the first PDU session, the first flow table being used to indicate a forwarding path of a data flow of the first PDU session.

[0279] Wherein, for step 707, please refer to the description of FIG. 2 and FIG. 3, which will not be repeated here.

[0280] 709、The SMF sends the first traffic control parameter and the first flow table to the RAN.

[0281] Correspondingly, the RAN receives the first traffic control parameter and the first flow table from the SMF.

[0282] In the embodiment shown in FIG. 7, the RAN can determine to start traffic control for the first PDU session through the first traffic control parameter and / or the first flow table.

[0283] Optionally, the SMF can also send second indication information to the RAN, the second indication information being used to instruct the RAN to start traffic control for the first PDU session.

[0284] 710、The UE and the AS perform interaction of the QP establishment information, and establish an RDMA connection.

[0285] As an example, the UE can obtain the QP establishment information of the AS. For example, the UE obtains the QP establishment information of the AS through the SMF. The AS obtains the QP establishment information of the UE. For example, the AS obtains the QP establishment information of the UE through the SMF. This indicates that the UE and the AS perform interaction of the QP establishment information, thereby establishing an RDMA connection.

[0286] 711、The UE and the AS transmit a data flow of the first PDU session.

[0287] For example, the UE and the AS transmit a downlink data flow and / or an uplink data flow of the first PDU session.

[0288] 712、The RAN determines, based on the first traffic control parameter, that a data flow of the first PDU session is congested.

[0289] Wherein, for step 712, please refer to step 412 of FIG. 4, which will not be repeated here.

[0290] Wherein, after step 712, there are two implementation manners, implementation manner 1 includes step 713 and step 714, and implementation manner 2 includes step 715 and step 716.

[0291] 713、The RAN sends, to the UE, a first congestion notification packet message based on the first flow table, where the first congestion notification packet message is used to notify that the data flow of the first PDU session is congested.

[0292] Correspondingly, the UE or the AS receives the first congestion notification packet message from the RAN. When the UE receives the first congestion notification packet message, step 714 can be performed.

[0293] The step 713 can refer to the related description in FIG. 2, and will not be repeated here.

[0294] 714、The UE adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0295] For example, the UE reduces the sending rate of the packets in the data flow of the first PDU session.

[0296] 715、The RAN sends, to the AS, a first congestion notification packet message based on the first flow table, where the first congestion notification packet message is used to notify that the data flow of the first PDU session is congested.

[0297] Correspondingly, the AS receives the first congestion notification packet message from the RAN. When the AS receives the first congestion notification packet message, step 716 can be performed.

[0298] The step 715 can refer to the related description in FIG. 2, and will not be repeated here.

[0299] 716、The AS adjusts the sending rate of the packets in the data flow of the first PDU session based on the first congestion notification packet message.

[0300] For example, the AS reduces the sending rate of the packets in the data flow of the first PDU session.

[0301] It can be seen that in the above embodiments, the first flow control parameter and the first flow table are determined by the SMF and sent to the RAN, so that the RAN can send the first congestion notification packet message based on the first flow table when the data flow of the first PDU session is congested based on the first flow control parameter, and then the RDMA technology is used for flow control in the wireless communication scenario, such as reducing the queue backlog on the congested side. This can guarantee the low delay of the service, does not affect the throughput of the service, and improves the performance and quality of the service. In addition, the determination of the congestion of the data flow of the first PDU session and the sending of the first congestion notification packet message are both performed by the RAN, which can reduce the transmission delay of the two air interfaces, can realize more timely wireless RDMA flow control, and makes the elimination of congestion more timely.

[0302] It can be understood that, to achieve the above functions, the above device comprises the hardware structure and / or software module corresponding to the execution of each function. Those skilled in the art should easily realize that, in combination with the units and algorithm steps of the examples described in the embodiments disclosed in the present text, the present application can be realized in the form of hardware or the combination of hardware and computer software. Whether a certain function is executed in the form of hardware or computer software driven hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to realize the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0303] The embodiments of the present application can divide the functions of the above device into function modules according to the above method examples. For example, each function module can be divided according to each function, or two or more functions can be integrated into one processing module. The integrated module can be realized in the form of hardware or software function module. It should be noted that the division of modules in the embodiments of the present application is illustrative, and is only a logical function division. Actual implementation can have another division manner.

[0304] Referring to FIG. 8, FIG. 8 is a structural schematic diagram of a communication apparatus provided by an embodiment of the present application. The communication apparatus 800 can be applied in any of the above-described methods. As shown in FIG. 8, the communication apparatus 800 comprises a processing module 801 and a transceiver module 802. The processing module 801 can be one or more processors, and the transceiver module 802 can be a transceiver or a communication interface. The communication apparatus can be used to realize the functions of the access network device or the session management network element in any of the above-described method embodiments, or to realize the functions of the network element in any of the above-described method embodiments. The network element or network function can be a network element in a hardware device, a software function running on a special hardware, or a virtualized function instantiated on a platform (for example, a cloud platform). Optionally, the communication apparatus 800 can further comprise a storage module 803 for storing the program code and data of the communication apparatus 800.

[0305] An example is that the communication apparatus serves as an access network device or a chip applied in an access network device, that is, a chip for an access network device, and executes the steps performed by the access network device in the above-described method embodiments. The transceiver module 802 is used to specifically perform any sending and / or receiving actions performed by the access network device, for example, to support the access network device to perform other processes of the technologies described in the present text. The processing module 801 can be used to support the communication apparatus 800 to perform the processing actions in the above-described method embodiments, for example, to support the access network device to perform other processes of the technologies described in the present text.

[0306] For example, the processing module 801 is configured to determine that a data flow of a first PDU session is congested based on a first flow control parameter of the first PDU session, the first PDU session being a session established by the terminal for communication with a server; and the transceiver module 802 is configured to send a first congestion notification packet based on a first flow table of the first PDU session, the first flow table being used to indicate a forwarding path of the data flow of the first PDU session, and the first congestion notification packet being used to notify that the data flow of the first PDU session is congested.

[0307] In a possible implementation, the transceiver module 802 is further configured to receive first information from a session management network element, the first information being used to determine the first flow control parameter.

[0308] In a possible implementation, the first information is a first QoS requirement corresponding to the first PDU session, and the processing module 801 is further configured to determine the first flow control parameter based on the first QoS requirement.

[0309] In a possible implementation, when determining the first flow control parameter based on the first QoS requirement, the processing module 801 is configured to determine the first flow control parameter based on the first QoS requirement and capability information of the access network device, the capability information of the access network device including an air interface transmission rate and / or a buffer size supported by the access network device.

[0310] In a possible implementation, when determining the first flow control parameter based on the first QoS requirement, the processing module 801 is configured to determine the first flow control parameter based on the first QoS requirement and a first correspondence relationship. The first correspondence relationship includes a correspondence relationship between a plurality of QoS requirements and a plurality of flow control parameters, and the correspondence relationship between the plurality of QoS requirements and the plurality of flow control parameters includes a correspondence relationship between the first QoS requirement and the first flow control parameter.

[0311] In a possible implementation, the transceiver module 802 is further configured to send the capability information of the access network device to the session management network element, the capability information of the access network device including the air interface transmission rate and / or the buffer size supported by the access network device.

[0312] In a possible implementation, the transceiver module 802 is further configured to receive second information from the session management network element, the second information being used to obtain the capability information of the access network device.

[0313] In a possible implementation, the processing module 801 is further configured to establish the first flow table based on QP connection information of the terminal and QP connection information of the server.

[0314] In a possible implementation, the transceiver 802 is further configured to receive the QP establishment information of the terminal and the QP establishment information of the server from the session management network element.

[0315] In a possible implementation, the transceiver 802 is further configured to obtain a first packet in a data flow of the first PDU session, the first packet comprising a source address, a destination address, a destination QP field, a source QP field, and a port index, and the processing module 801 is further configured to establish the first flow table based on the source address, the destination address, the destination QP field, the source QP field, and the port index. The source address is an address of the terminal, the destination address is an address of the server, the destination QP field is used to indicate a QP number of the server, the source QP field is used to indicate a QP number of the terminal, and the port index indicates a port of the server. Alternatively, the source address is an address of the server, the destination address is an address of the terminal, the destination QP field is used to indicate a QP number of the terminal, the source QP field is used to indicate a QP number of the server, and the port index indicates a port of the terminal.

[0316] In a possible implementation, the transceiver 802 is further configured to receive first indication information from the session management network element, the first indication information being used to instruct the access network device to establish the first flow table.

[0317] In a possible implementation, the transceiver 802 is further configured to receive the first flow table from the session management network element.

[0318] In a possible implementation, the transceiver 802 is further configured to receive second indication information from the session management network element, the second indication information being used to instruct the access network device to start traffic control for the first PDU session.

[0319] In an example, the communication apparatus functions as a session management network element or a chip applied in a session management network element, i.e., a chip for a session management network element, and performs the steps performed by the session management network element in the method embodiments. The transceiver 802 is configured to specifically perform any sending and / or receiving actions performed by the session management network element, for example, to support the session management network element to perform other processes of the techniques described herein. The processing module 801 can be configured to support the communication apparatus 800 to perform processing actions in the method embodiments, for example, to support the session management network element to perform other processes of the techniques described herein.

[0320] For example, the processing module 801 is configured to determine that the data flow of the first PDU session is transmitted in the RDMA protocol, the first PDU session being a session established by the terminal for communication with the server; and the transceiver module 802 is configured to send first information to the access network device, the first information being used to determine a first flow control parameter of the first PDU session, the first flow control parameter being used to determine that the data flow of the first PDU session is congested.

[0321] In a possible implementation, when it is determined that the data flow of the first PDU session is transmitted in the RDMA protocol, the processing module 801 is configured to: acquire, by the transceiver module 802, a request message, the request message being used to indicate that the data flow of the first PDU session is transmitted in the RDMA protocol; and determine, based on the request message, that the data flow of the first PDU session is transmitted in the RDMA protocol.

[0322] In a possible implementation, when it is determined, based on the request message, that the data flow of the first PDU session is transmitted in the RDMA protocol, the processing module 801 is configured to determine, based on the request message and subscription information of the terminal, that the data flow of the first PDU session is transmitted in the RDMA protocol, the subscription information of the terminal including a session type of the first PDU session and / or a protocol version of an RDMA protocol supported by the terminal, the session type of the first PDU session being used to indicate that the first PDU session is a PDU session transmitted based on the RDMA protocol.

[0323] In a possible implementation, the processing module 801 is further configured to determine the first flow control parameter based on a first QoS requirement corresponding to the first PDU session.

[0324] In a possible implementation, when the first flow control parameter is determined based on the first QoS requirement, the processing module 801 is configured to determine, based on the first QoS requirement and capability information of the access network device, the first flow control parameter, the capability information of the access network device including an air interface transmission rate and / or a buffer size supported by the access network device.

[0325] In a possible implementation, the transceiver module 802 is further configured to receive the capability information of the access network device.

[0326] In a possible implementation, the transceiver module 802 is further configured to send second information to the access network device, the second information being used to acquire the capability information of the access network device.

[0327] In a possible implementation, the transceiver 802 is further configured to: obtain QP chaining information of the terminal, and obtain QP chaining information of the server, the QP chaining information of the terminal and the QP chaining information of the server being used to establish a first flow table of a first PDU session, the first flow table being used to indicate a forwarding path of a data flow of the first PDU session; and send, to the access network device, the QP chaining information of the terminal and the QP chaining information of the server.

[0328] In a possible implementation, the transceiver 802 is further configured to send, to the access network device, first indication information, the first indication information being used to instruct the access network device to establish the first flow table.

[0329] In a possible implementation, the transceiver 802 is further configured to send, to the access network device, the first flow table.

[0330] In a possible implementation, the transceiver 802 is further configured to send, to the access network device, second indication information, the second indication information being used to instruct the access network device to start flow control for the first PDU session.

[0331] In a possible implementation, when the apparatus is a chip, the transceiver 802 can be a communication interface, a pin, or a circuit, and the like. The communication interface can be configured to input data to be processed to the processor, and output the processing result of the processor to the outside. In a specific implementation, the communication interface can be a general purpose input output (GPIO) interface, and can be connected with a plurality of peripheral devices, such as a display (LCD), a camera, a radio frequency (RF) module, an antenna, and the like. The communication interface is connected with the processor through a bus.

[0332] The processing module 801 can be a processing circuit, which can be one or more processors, or all or part of circuitry in the one or more processors for control and / or processing. Among them, the processing circuit or the processor can execute the computer execution instructions stored in the storage module to make the chip execute any involved method. Further, the processor can include a controller, an arithmetic unit and a register. Illustratively, the controller is mainly responsible for instruction decoding and issuing control signals for corresponding operations of instructions. The arithmetic unit is mainly responsible for performing fixed-point or floating-point arithmetic operations, shift operations, and logic operations, etc., and can also perform address operations and conversion. The register is mainly responsible for saving the register operands and intermediate operation results temporarily stored in the process of instruction execution, etc. In specific implementation, the hardware architecture of the processor can be an application-specific integrated circuit (ASIC) architecture, a microprocessor without interlocked piped stages architecture (MIPS) architecture, an advanced RISC machines (ARM) architecture, or a network processor (NP) architecture, etc. The processor can be single-core or multi-core. The storage module can be a storage module within the chip, such as a register, a cache, etc. The storage module can also be a storage module located outside the chip, such as a read-only memory (ROM) or other types of static storage devices that can store static information and instructions, a random access memory (RAM), etc.

[0333] It should be noted that the functions of the processor and the interface correspondingly can be realized by hardware design, software design, or a combination of software and hardware, which is not limited here.

[0334] Fig. 9 is a structural schematic diagram of another communication apparatus provided in embodiments of the present application. It can be understood that the communication apparatus 910 includes necessary means such as modules, units, elements, circuits, or interfaces, etc., which are configured together to perform the present solution. The communication apparatus 910 can be the access network device, the session management network element, or the like, or can be a component (e.g., a chip) of the device, to implement the methods described in the above method embodiments. The communication apparatus 910 includes one or more processors 911. The processor 911 can be a general processor or a special purpose processor, etc. For example, it can be a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control the communication apparatus (e.g., the access network device, the session management network element, or the chip, etc.), execute software programs, and process data of the software programs.

[0335] Optionally, in one design, the processor 911 can include a program 913 (which can also be referred to as code or instructions at times) that can be run on the processor 911, so that the communication apparatus 910 performs the methods described in the above embodiments. In another possible design, the communication apparatus 910 includes a circuit (not shown in Fig. 9) for implementing the functions of the access network device, the session management network element, etc. in the above embodiments. Optionally, the communication apparatus 910 can include one or more memories 912 having a program 914 (which can also be referred to as code or instructions at times) stored thereon, which can be run on the processor 911, so that the communication apparatus 910 performs the methods described in the above method embodiments.

[0336] Optionally, the processor 911 and / or the memory 912 can also store data. The processor and the memory can be separately arranged or integrated together.

[0337] Optionally, when the communication apparatus 910 is the access network device, the session management network element, or the like, it can further include a transceiver 915 and / or an antenna 916. The processor 911 can also be referred to as a processing unit, which controls the communication apparatus (e.g., the access network device, the session management network element, or the like). The transceiver 915 can also be referred to as a transceiving unit, a transceiver, a transceiving circuit, or a transceiver, etc., which is used to realize the transceiving function of the communication apparatus through the antenna 916.

[0338] Optionally, when the communication apparatus 910 is a chip for the access network device, the session management network element, or the like, it can further include a transceiving circuit, such as an input / output interface, or a transceiving interface.

[0339] Embodiments of the present application also provide a communication apparatus, which includes at least one processor; wherein the at least one processor is configured to perform any of the methods described in any of the above embodiments.

[0340] The embodiments of the present application further provide a computer readable storage medium storing computer instructions, when the computer instructions are executed, causing a computer to perform the method of any of the embodiments.

[0341] The embodiments of the present application further provide a computer program product, comprising: computer program codes, when the computer program codes are run by a computer, causing the computer to perform the method of any of the embodiments.

[0342] The embodiments of the present application further provide a chip, comprising at least one processor and an interface, the processor being configured to read and execute instructions stored in a memory, when the instructions are run, causing the chip to perform the method of any of the embodiments.

[0343] Optionally, the processing performed by a single execution subject (an access network device, or a session management network element, etc.) shown in any of the embodiments above can also be divided into processing performed by multiple execution subjects, which can be logically and / or physically separated. For example, the processing performed by the access network device can be divided into processing performed by at least one of the CU, the DU and the RU.

[0344] In addition, each of the embodiments of the present application is only described by taking all the steps included therein as an example, and should not be regarded as a specific limitation of the present application. For example, the order between the steps in each of the embodiments can be simply changed according to the function and the inherent logic thereof; for another example, the steps in each of the embodiments can be executed in whole or in part, as long as the same function as in the embodiments of the present application can be achieved.

[0345] In the present application, “sending” and “receiving” represent the direction of signal transmission. For example, “sending information to an access network device” can be understood as that the destination of the information is the access network device, which can include direct transmission through the air interface, or indirect transmission through the air interface by other units or modules. “Receiving information from an access network device” can be understood as that the source of the information is the access network device, which can include direct reception from the access network device through the air interface, or indirect reception from the access network device through the air interface by other units or modules. “Sending” can also be understood as the “output” of the chip interface, and “receiving” can also be understood as the “input” of the chip interface.

[0346] In other words, the sending and receiving can be between devices, for example, between an access network device and a terminal; or can be within a device, for example, between components, between modules, between chips, between software modules or hardware modules within the device through a bus, a wire or an interface.

[0347] In the embodiments of the present application, "when", "if", "whether" and "in the case of" all refer to the objective condition that the device will make corresponding processing, and are not limited in time, and do not require the device to have a judgment action when implemented, nor mean that there are other limitations.

[0348] In the present application, the words "example", "exemplary", "for example" or "for instance" etc. are used to indicate that the item being referred to is an example, instance or illustration. Any embodiment or design described herein as "example", "exemplary", "for example" or "for instance" should not be interpreted as being more preferred or advantageous than other embodiments or designs. Rather, the use of "example", "exemplary", "for example" or "for instance" is merely intended to present concepts in a concrete manner.

[0349] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: The method comprises: determining, based on a first protocol data unit (PDU) session, that data flow of the first PDU session is congested, the first PDU session being a session established by a terminal for communication with a server; sending, based on a first flow table of the first PDU session, a first congestion notification packet message, the first flow table being used to indicate a forwarding path of data flow of the first PDU session, and the first congestion notification packet message being used to notify that data flow of the first PDU session is congested.

2. The method of claim 1, wherein, The method further comprises: receiving first information from a session management network element, the first information being used to determine the first traffic control parameter.

3. The method of claim 2, wherein, The method further comprises: The first information is a first quality of service (QoS) requirement corresponding to the first PDU session, and the first traffic control parameter is determined based on the first QoS requirement.

4. The method of claim 3, wherein, The determination of the first traffic control parameter based on the first QoS requirement comprises: determining the first traffic control parameter based on the first QoS requirement and capability information of an access network device, the capability information of the access network device including an air interface transmission rate and / or a buffer size supported by the access network device.

5. The method of claim 3, wherein, The determination of the first traffic control parameter based on the first QoS requirement comprises: determining the first traffic control parameter based on the first QoS requirement and a first correspondence relationship; The first correspondence relationship comprises a correspondence relationship between a plurality of QoS requirements and a plurality of traffic control parameters, and the correspondence relationship between the plurality of QoS requirements and the plurality of traffic control parameters includes a correspondence relationship between the first QoS requirement and the first traffic control parameter.

6. The method of claim 2, wherein, The first information is the first traffic control parameter.

7. The method according to any one of claims 1 to 6, characterized in that, The method further comprises: establishing the first flow table based on queue pair (QP) link establishment information of the terminal and QP link establishment information of the server.

8. The method of claim 7, wherein, The method further comprises: receiving, from a session management network element, the QP link establishment information of the terminal and the QP link establishment information of the server.

9. The method according to any one of claims 1 to 6, characterized in that, The method further comprises: obtaining a first packet in data flow of the first PDU session, the first packet including a source address, a destination address, a destination QP field, and a port index; establishing the first flow table based on the source address, the destination address, the destination QP field, a source QP field, and the port index; The source address is an address of the terminal, the destination address is an address of the server, the destination QP field is used to indicate a QP number of the server, the source QP field is used to indicate a QP number of the terminal, and the port index indicates a port of the server; or The source address is an address of the server, the destination address is an address of the terminal, the destination QP field is used to indicate a QP number of the terminal, the source QP field is used to indicate a QP number of the server, and the port index indicates a port of the terminal.

10. The method according to any one of claims 1 to 9, characterized in that, The method further comprises: receiving first indication information from a session management network element, the first indication information being used to instruct an access network device to establish the first flow table.

11. The method according to any one of claims 1-6, characterized in that, The method further includes: receiving the first flow table from the session management network element.

12. The method according to any one of claims 1-11, characterized in that, The method further includes: receiving second indication information from the session management network element, the second indication information being used to instruct the access network device to start traffic control for the first PDU session.

13. A method of communication, comprising: comprise: determining to transmit a data flow of a first protocol data unit (PDU) session by using a remote direct memory access (RDMA) protocol, the first PDU session being a session established by a terminal for communicating with a server; sending first information to an access network device, the first information being used to determine a first traffic control parameter of the first PDU session, the first traffic control parameter being used to determine that a data flow of the first PDU session is congested.

14. The method of claim 13, wherein, The determination to transmit the data flow of the first PDU session by using the RDMA protocol comprises: obtaining a request message, the request message being used to instruct to transmit the data flow of the first PDU session by using the RDMA protocol; determining to transmit the data flow of the first PDU session by using the RDMA protocol based on the request message.

15. The method of claim 14, wherein, The request message comprises at least one of the following: a transmission type of the RDMA protocol, a protocol version of the RDMA protocol, or a service type of the RDMA protocol.

16. The method according to claim 14 or 15, characterized in that The determination to transmit the data flow of the first PDU session by using the RDMA protocol based on the request message comprises: determining to transmit the data flow of the first PDU session by using the RDMA protocol based on the request message and subscription information of the terminal, the subscription information of the terminal comprising a session type of the first PDU session and / or a protocol version of the RDMA protocol supported by the terminal, the session type of the first PDU session being used to indicate that the first PDU session is a PDU session for transmission based on the RDMA protocol.

17. The method according to any of claims 13-16, characterized by, The first information is a first quality of service (QoS) requirement corresponding to the first PDU session.

18. The method of any of claims 13-16, wherein, The first information is the first traffic control parameter.

19. The method of claim 18, wherein, The method further comprises: determining the first traffic control parameter based on a first QoS requirement corresponding to the first PDU session.

20. The method of claim 19, wherein, The determination of the first traffic control parameter based on the first QoS requirement comprises: determining the first traffic control parameter based on the first QoS requirement and capability information of the access network device, the capability information of the access network device comprising an air interface transmission rate and / or a buffer size supported by the access network device.

21. The method of any of claims 13-20, wherein, The method further comprises: obtaining queue pair (QP) connection information of the terminal and QP connection information of the server, the QP connection information of the terminal and the QP connection information of the server being used to establish a first flow table of the first PDU session, the first flow table being used to indicate a forwarding path of a data flow of the first PDU session; sending the QP connection information of the terminal and the QP connection information of the server to the access network device.

22. The method of any of claims 13-21, wherein, The method further comprises: sending first indication information to the access network device, the first indication information being used to instruct the access network device to establish a first flow table of the first PDU session, the first flow table being used to instruct a forwarding path of a data flow of the first PDU session.

23. The method of any of claims 13-20, wherein, The method further includes: sending the first flow table of the first PDU session to the access network device, the first flow table being used to instruct the forwarding path of the data flow of the first PDU session.

24. The method of any of claims 15-23, wherein, The method further includes: sending second indication information to the access network device, the second indication information being used to instruct the access network device to start traffic control for the first PDU session.

25. A communications device, characterized by The communication device includes at least one processor; wherein the at least one processor is configured to perform the method of any one of claims 1 to 24.

26. A communications device, characterized by The communication device includes at least one processor; wherein the at least one processor is configured to perform the method of any one of claims 1 to 24.

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