WO2024067640A1 - 一种协议数据单元集合传输方法及装置 - Google Patents
一种协议数据单元集合传输方法及装置 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/56—Allocation or scheduling criteria for wireless resources based on priority criteria
- H04W72/566—Allocation or scheduling criteria for wireless resources based on priority criteria of the information or information source or recipient
Definitions
- the embodiments of the present application relate to the field of wireless communications, and in particular, to a method and device for transmitting a protocol data unit set.
- real-time media services such as the emerging virtual reality (VR), augmented reality (AR), mixed reality (MR), and cloud gaming
- VR virtual reality
- AR augmented reality
- MR mixed reality
- cloud gaming have extremely stringent requirements for end-to-end latency, and the corresponding data processing granularity of upper-layer media services during encoding and transmission is no longer based on the granularity of data packets.
- media frames and fragments can be encoded and processed independently, and the receiving side will also decode and display them at the granularity of media frames and fragments.
- media frames and fragments often contain multiple IP packets (due to the size limit of IP packets).
- the standard defines a protocol data unit set (PDU Set) as a basic unit that can be independently processed by the media service layer.
- a PDU Set can include multiple PDU data packets (referred to as data packets).
- the current standard proposes a quality of service (quantity of server, QoS) processing mechanism at the PDU Set granularity, which will give the loss rate and latency requirements of the PDU Set granularity.
- QoS quality of service
- the present application provides a method and device for transmitting a protocol data unit set, so as to realize efficient transmission of a protocol data unit set.
- the present application provides a method for transmitting a protocol data unit set, the method comprising:
- a first device transmits a set of protocol data units for a service used on a terminal device to a second device
- the first device determines that transmission of a first data packet in the set of protocol data units has failed, and the first device discards a data packet in the set of protocol data units whose sequence number is greater than the sequence number of the first data packet.
- the first device when the first device finds that a data packet fails to be transmitted during the process of transmitting protocol unit data, it will actively discard the transmission of subsequent data packets with sequence numbers greater than the sequence number of the data packet, thereby avoiding the waste of resources and burden caused by meaningless resource consumption on the transmission side of the first device, and ensuring the efficient transmission of the protocol data unit set.
- the sequence number of a data packet may also be called the serial number of the data packet, which may be used to indicate the order in which the data packets are sent on the server side. A data packet with a larger sequence number will be sent after a data packet with a smaller sequence number.
- the protocol data unit set includes multiple uplink data packets, and the first device is a terminal device; or the protocol data unit set includes multiple downlink data packets, and the first device is a user plane network element; the first device determines multiple data packets belonging to the protocol data unit set, and the first device adds the sequence number of each data packet in the multiple data packets to the header of the corresponding data packet.
- the terminal device can determine that the protocol data unit set includes the sequence numbers of multiple uplink data packets and add them to the header of the data packet, and the user plane network element can determine that the protocol data unit set includes the sequence numbers of multiple downlink data packets and add them to the header of the data packet.
- the sequence number of the data packet it is possible to further determine the order of the data packets according to the sequence number of the data packet, thereby determining the priority of the data packet, wherein the data packet with a smaller sequence number has a higher priority.
- the following method may be used but is not limited to:
- Mode 1 When the received second data packet includes a preset field and the received third data packet includes the preset field, the first device determines that a data packet received after the second data packet to the third data packet belong to the protocol data unit set;
- the user plane network element can also determine the sequence number of the first data packet in the protocol data unit set according to the sequence number of the second data packet, and determine the sequence number of the last data packet in the protocol data unit set according to the sequence number of the third data packet. Furthermore, the user plane network element can determine whether all the data packets in the protocol data unit set have arrived, that is, whether the data packets with a sequence number greater than the sequence number of the second data packet and less than or equal to the sequence number of the third data packet have all arrived, based on the sequence number of the third data packet and the sequence numbers of other data packets that have arrived.
- the user plane network element determines that all the data packets in the protocol data unit set have arrived; if not, the user plane network element further determines which data packet or packets have not yet arrived, and waits for the above-mentioned unarrived data packets to arrive at the first device.
- Mode 2 The first device determines that data packets with the same timestamp belong to the same protocol data unit set.
- the first device receives first indication information from a session management network element, and the first indication information is used to indicate that if a data packet that fails to be transmitted is determined during the transmission of the protocol data unit set, then the data packet in the protocol data unit set whose sequence number is greater than the sequence number of the data packet that fails to be transmitted is discarded, or it can be understood as discarding the data packet in the protocol data unit set that follows the data packet that fails to be transmitted.
- the first device can obtain the first indication information from the session management network element, and determine that a data packet has failed to be transmitted during the transmission of the protocol data unit set based on the first indication information, and then discard the data packet in the protocol data unit set whose sequence number is greater than the sequence number of the data packet that failed to be transmitted, thereby avoiding the waste of resources and burden caused by meaningless resource consumption on the transmission side of the first device, and ensuring the efficient transmission of the protocol data unit set.
- the first device transmits multiple data packets in the protocol data unit set in ascending order according to their sequence numbers.
- the first device transmits the multiple data packets in the protocol data unit set in ascending order of sequence numbers, that is, transmits the multiple data packets in the protocol data unit set in a sequential order or a priority order.
- the first device can give priority to transmitting data packets with smaller sequence numbers, i.e., ensure that data packets with smaller sequence numbers or those at the front of the protocol data unit set are transmitted successfully, so that the second device can decode according to the data packets with smaller sequence numbers, thereby ensuring the efficient transmission of the protocol data unit set.
- the protocol data unit set includes a first part of data packets and a second part of data packets, the first part of data packets and the second part of data packets are not repeated, the priority of the first part of data packets is higher than the priority of the second part of data packets, the header of each data packet in the first part of data packets includes a first identifier, the header of each data packet in the second part of data packets includes a second identifier, and the ratio of the total number of the first part of data packets to the total number of data packets included in the protocol data unit set is greater than or equal to a preset ratio of the transmission success rate; it can be understood that the sequence number of the first part of data packets is less than the sequence number of the second part of data packets, or the first part of data packets are located in the front position of the protocol data unit set, and the second part of data packets are located in the back position of the protocol data unit set.
- the first device Before the first device determines that the transmission of the first data packet in the protocol data unit set fails, the first device transmits the first part of data packets through the first QoS flow according to the first identifier, and transmits the second part of data packets through the second QoS flow according to the second identifier.
- the first device can transmit the two parts of data packets included in the protocol data unit set through different QoS flows. Since the priority of the first part of the data packets is higher than that of the second part of the data packets, the configuration parameters of the first QoS flow can be adjusted to prioritize the successful transmission of the first part of the data packets, thereby ensuring the efficient transmission of the protocol data unit set, improving network capacity and ensuring the user's service experience.
- the first device receives second indication information from a session management network element, and the second indication information indicates a preset ratio of the transmission success rate.
- the protocol data unit set includes multiple uplink data packets, and the first device is a terminal device; or the protocol data unit set includes multiple downlink data packets, and the first device is a user plane network element;
- the first device determines the first part of data packets and the second part of data packets according to a preset ratio of the transmission success rate, and adds the first identifier to the header of each data packet in the first part of data packets, and adds the second identifier to the header of each data packet in the second part of data packets.
- the terminal device when the protocol data unit set includes multiple uplink data packets and the first device is an access network device, the terminal device The first part of data packets and the second part of data packets are determined according to the preset ratio of the transmission success rate, and the first identifier is added to the header of each data packet in the first part of data packets. The second identifier is added to the header of each data packet in the second part of data packets, or when the protocol data unit set includes multiple downlink data packets, and the first device is an access network device, the user plane network element determines the first part of data packets and the second part of data packets according to the preset ratio of the transmission success rate, and adds the first identifier to the header of each data packet in the first part of data packets.
- the terminal device or user-side network element determines the first part of the data packet and the second part of the data packet based on a preset ratio of the transmission success rate, and distinguishes the first part of the data packet from the second part of the data packet by adding a first identifier to the first part of the data packet and adding a second identifier to the second part of the data packet, thereby ensuring subsequent differentiated data packet transmission processing.
- the first identifier is an identifier of the first QoS flow
- the second identifier is an identifier of the second QoS flow.
- the terminal device adds a first identifier to the header of each data packet in the first part of the data packets, and adds a second identifier to the header of each data packet in the second part of the data packets
- the first identifier can also be an identifier of the first priority
- the second identifier can also be an identifier of the second priority, wherein the first priority is higher than the second priority.
- the first device can ensure that the data packet with the first priority identifier is transmitted first based on the first priority identifier and the second priority identifier.
- the first device is a user plane network element, and the header of each data packet is a user plane General Packet Service Tunneling Protocol GTP-U layer header; if the protocol data unit set includes multiple uplink data packets, the first device is a terminal device, and the header of each data packet is a Packet Data Convergence Protocol PDCP layer header or a Service Data Adaptation Protocol SDAP layer header.
- GTP-U General Packet Service Tunneling Protocol
- the first device after discarding data packets in the protocol data unit set whose sequence numbers are greater than the sequence number of the first data packet, the first device continues to transmit data packets whose sequence numbers are less than the sequence number of the first data packet.
- the first device still needs to ensure the transmission of the data packets with sequence numbers less than the sequence number of the first data packet.
- the first device determines that the transmission of the first data packet in the protocol data unit set fails, the first device determines that the number of retransmissions of the first data packet exceeds a retransmission number threshold; or, the first device determines that the transmission duration of the first data packet exceeds a transmission duration threshold.
- the protocol data unit set includes multiple uplink data packets; the first device is a terminal device, and the second device is an access network device; or, the first device is an access network device, and the second device is a user plane network element; or, the first device is a user plane network element, and the second device is a data network.
- the protocol data unit set includes multiple downlink data packets; the first device is a user plane network element, and the second device is an access network device; or, the first device is an access network device, and the second device is a terminal device.
- the present application provides a protocol data unit set transmission method, the method comprising:
- the session management network element receives first indication information from the policy control network element, wherein the first indication information is used to indicate that if a data packet that fails to be transmitted is determined during the transmission of a set of protocol data units, then the data packet in the set of protocol data units whose sequence number is greater than the sequence number of the data packet that fails to be transmitted is discarded; the session management network element sends the first indication information to the first device.
- the session management network element can receive the first indication information from the policy control network element and notify the first device, so that the first device can discard the data packet in the protocol data unit set whose sequence number is greater than the sequence number of the data packet that failed to be transmitted when determining the data packet that failed to be transmitted during the process of transmitting a set of protocol data units based on the first indication information.
- the session management network element receives second indication information from the policy control network element, where the second indication information is used to indicate a preset ratio of the transmission success rate, where the preset ratio of the transmission success rate is the minimum ratio of the total number of data packets in the protocol data unit set that need to be successfully transmitted before a data packet fails to be transmitted to the total number of data packets included in the protocol data unit set; the session management network element sends the second indication information to the first device.
- the present application provides a protocol data unit set transmission method, the method comprising:
- the policy control network element receives first indication information from the application function network element, wherein the first indication information is used to indicate that if a data packet that fails to be transmitted is determined during the transmission of a protocol data unit set, then the data packet in the protocol data unit set whose sequence number is greater than the sequence number of the data packet that fails to be transmitted is discarded; the policy control network element sends the first indication information to the session management network element.
- the policy control network element can receive the first indication information from the application function network element and notify the session management network element.
- the policy control network element receives second indication information from the application function network element, wherein the second indication information
- the information is used to indicate a preset ratio of the transmission success rate, which is a minimum ratio of the total number of data packets in the protocol data unit set that need to be successfully transmitted before a data packet with transmission failure occurs to the total number of data packets included in the protocol data unit set;
- the policy control network element sends the second indication information to the session management network element.
- the terminal device may also send first indication information to the first device.
- the second indication information may also be preconfigured to the terminal device or user plane network element in a preconfiguration manner.
- the present application further provides a device.
- the device can execute the above method design.
- the device can be a chip or circuit capable of executing the function corresponding to the above method, or a device including the chip or circuit.
- the device includes: a memory for storing computer executable program code; and a processor coupled to the memory.
- the program code stored in the memory includes instructions, and when the processor executes the instructions, the device or a device equipped with the device executes the method in any of the above possible designs.
- the device may further include a communication interface, which may be a transceiver, or, if the device is a chip or a circuit, the communication interface may be an input/output interface of the chip, such as an input/output pin.
- a communication interface which may be a transceiver, or, if the device is a chip or a circuit, the communication interface may be an input/output interface of the chip, such as an input/output pin.
- the device includes corresponding functional units, which are respectively used to implement the steps in the above method.
- the functions can be implemented by hardware, or by hardware executing corresponding software.
- the hardware or software includes one or more units corresponding to the above functions.
- the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program runs on a device, it executes the method in any one of the possible designs described above.
- the present application provides a computer program product, which includes a computer program.
- the computer program runs on a device, it executes the method in any possible design described above.
- FIG1 is a schematic diagram of the architecture of a mobile communication system used in the present application.
- FIG2 is a flowchart of a protocol data unit set transmission method provided by the present application.
- FIG3 is a schematic diagram of one of the transmission methods of a protocol data unit set when the protocol data unit set includes a downlink data packet provided by the present application;
- FIG4 is a schematic diagram of one of the transmission methods of a protocol data unit set when the protocol data unit set includes an uplink data packet provided by the present application;
- FIG5 is a second schematic diagram of a method for transmitting a protocol data unit set when the protocol data unit set includes a downlink data packet provided by the present application;
- FIG6 is a second schematic diagram of a method for transmitting a protocol data unit set when the protocol data unit set includes a downlink data packet provided by the present application;
- FIG7 is a schematic diagram of a structure of a communication device provided by the present application.
- FIG8 is a second schematic diagram of the structure of a communication device provided in the present application.
- the 5G communication system is standardized by the 3rd Generation Partnership Project (3GPP).
- the communication system includes terminal equipment (e.g., user equipment (UE)), access network equipment (AN) (e.g., radio access network (RAN)), and core network (CN).
- UE user equipment
- AN access network equipment
- CN core network
- the network elements of the core network (DN) can be divided into two parts: the user plane and the control plane.
- the control plane is responsible for the management of the mobile network, and the user plane is responsible for the transmission of service data.
- the terminal device is the entrance for mobile users to interact with the network. It can provide basic computing power and storage capacity, display service windows to users, and receive user operation input.
- the next generation of terminal equipment (NextGen UE) can use new air interface technology to establish signal connection and data connection with access network equipment, thereby transmitting control signals and service data to the mobile network.
- Terminal equipment can include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to wireless modems, as well as various forms of terminals, mobile stations (MS), terminals, soft terminals, etc., such as water meters, electricity meters, sensors, etc.
- Access network equipment Deployed near terminal devices, it provides network access for authorized users in a specific area and can determine transmission tunnels of different qualities to transmit user data according to user levels, business requirements, etc. Access network equipment can manage its own resources, use them reasonably, provide access services to terminal devices on demand, and is responsible for forwarding control signals and user data between terminal devices and the core network.
- Core network responsible for maintaining the subscription data of the mobile network, managing the network elements of the mobile network, and providing session management, mobility management, policy management, security authentication and other functions for terminal devices.
- the terminal device When the terminal device is attached, it provides network access authentication for the terminal device; when the terminal device has a service request, it allocates network resources for the terminal device; when the terminal device moves, it updates network resources for the terminal device; when the terminal device is idle, it provides a fast recovery mechanism for the terminal device; when the terminal device detaches, it releases network resources for the terminal device; when the terminal device has service data, it provides data routing functions for the terminal device, such as forwarding uplink data to the data network; or receiving downlink data of the terminal device from the data network and forwarding it to the access network device, so that the access network device sends it to the terminal device.
- Data network A data network that provides business services to users.
- the client is located in the terminal device and the server is located in the data network.
- the data network can be a private network, such as a local area network, or an external network that is not controlled by the operator, such as the Internet. It can also be a proprietary network jointly deployed by operators, such as a network that provides IP multimedia core network subsystem (IMS) services.
- IMS IP multimedia core network subsystem
- the user plane of the core network includes user plane function (UPF); the control plane of the core network includes access and mobility management function (AMF), session management function (SMF), network exposure function (NEF), network function repository function (NF repository function, NRF), unified data management (UDM), policy control function (PCF), and application function (AF).
- UPF user plane function
- AMF access and mobility management function
- SMF session management function
- NEF network exposure function
- UDM network function repository function
- UDM unified data management
- PCF policy control function
- AF application function
- the core network control plane adopts a service-oriented architecture, and the interaction between control plane network elements adopts the service call method to replace the point-to-point communication method in the traditional architecture.
- the control plane network elements will open services to other control plane network elements for other control plane network elements to call; in point-to-point communication, the communication interface between control plane network elements will store a set of specific messages, which can only be used by the control plane network elements at both ends of the interface when communicating.
- Session management network element mainly used for session management, IP address allocation and management of terminal devices, selection of endpoints for manageable user equipment plane functions, policy control, or charging function interfaces, and downlink data notification.
- the session management network element can be an SMF network element.
- the session management function network element can still be an SMF network element, or have other names, which is not limited in this application.
- Nsmf is a service-based interface provided by SMF, and SMF can communicate with other network functions through Nsmf.
- Access management network element mainly used for mobility management and access management, etc.
- it can be the mobility management entity (MME) function in the 4G communication network or the AMF network element in the 5G network.
- MME mobility management entity
- the access management network element can still be the AMF network element, or have other names, which is not limited in this application.
- Namf is a service-based interface provided by AMF, and AMF can communicate with other network functions through Namf.
- Network open network element used to securely open the services and capabilities provided by 3GPP network functions to the outside.
- the network open network element can be a NEF network element.
- the network open function network element can still be a NEF network element, or have other names, which are not limited in this application.
- Nnef is a service-based interface provided by NEF, and NEF can communicate with other network functions through Nnef.
- Network storage network element used to provide service registration, discovery and authorization, and maintain available network function (NF) instance information, which can realize on-demand configuration of network functions and services and interconnection between NFs.
- the network storage network element can be an NRF network element.
- the network storage function network element can still be an NRF network element, or have other names, which is not limited in this application.
- Nnrf is a service-based interface provided by NRF, and NRF can communicate with other network functions through Nnrf.
- Policy control network element a unified policy framework for guiding network behavior, providing policy rule information for control plane functional network elements (such as AMF, SMF, etc.).
- the policy control network element can be a PCF network element.
- future communications such as 6G communication, the policy control network element can still be a PCF network element, or have other names, which are not limited in this application.
- Npcf is a service-based interface provided by PCF, and PCF can communicate with other network functions through Npcf.
- Data management network element used to process user identification, contract signing, access authentication, registration, or mobility management.
- the data management network element can be a UDM network element.
- future communications such as 6G communication, the data management network element can still be a UDM network element, or have other names, which are not limited in this application.
- Nudm is a service-based interface provided by UDM, and UDM can communicate with other network functions through Nudm.
- Application network element used for data routing affected by applications, access to network open functions, or interacting with the policy framework for policy control, etc.
- application network elements can be AF network elements.
- application network elements can still be AF network elements, or have other names, which are not limited in this application.
- Naf is a service-based interface provided by AF, and AF can communicate with other network functions through Naf.
- User plane network element used for packet routing and forwarding, or quality of service (QoS) processing of user plane data.
- the user plane network element may be a user plane function (UPF) network element.
- UPF user plane function
- future communications such as 6G communication
- the user plane network element may still be a UPF network element, or have other names, which is not limited in this application.
- the core network may also include other network elements, which is not limited in this application.
- QoS flow When the UE has a service communication requirement, the UE will establish a data connection session (such as a PDU session or other forms of session), and the corresponding QoS flow is used to carry the service flow in the data connection session. Specifically, the UE obtains an IP address through the PDU session establishment to interact with the external service server to achieve service communication, and 5GS maps the corresponding service to different QoS flows based on the service flow description information, such as the service data flow template (SDF template), and performs the corresponding QoS processing.
- SDF template service data flow template
- QoS flow identifier (QoSflowidentifier) is used to uniquely identify different QoS flows within a PDU session.
- the existing QoS mechanism guarantees services at the granularity of data packets, such as the packet error rate (PER) and packet delay budget (PDB) in the current QoS parameters.
- Service data will be mapped to the same QoS flow for transmission, and the same QoS flow has the same QoS parameters.
- Data packets corresponding to the same QoS flow will be processed and transmitted in the same policy according to the same QoS parameters. In other words, all data packets in the same QoS flow will be processed equally and without distinction during transmission.
- GTP-U GPRS tunneling protocol-user plane
- the connection between RAN and UPF will use the GTP-U tunnel, that is, the data from/to the UE side is added to the tunnel for sending.
- the GTP-U tunnel is PDU session granularity, that is, each PDU session will establish a GTP-U tunnel between RAN and UPF.
- the PDU data packet is an IP data packet as an example for explanation.
- a PDU Set can include multiple PDU packets, for example, a PDU set includes multiple IP packets.
- PDU Set During the transmission of PDU Set, if one or some data packets in PDU Set are lost or damaged, the entire PDU Set may be difficult to decode or display correctly.
- the specific scenarios include the following:
- Scenario 1 When a PDU data packet in a PDU Set is lost or damaged, the receiving end cannot correctly decode and display the other PDU data packets in the remaining PDU Set.
- the service layer or application layer of the sending end performs forward error correction (FEC) on the PDU Set before sending it, that is, by adding additional redundant data packets to alleviate the impact of packet loss on the service experience during transmission.
- FEC forward error correction
- Scenario 3 After the receiving end receives the first n-1 packets in the PDU Set and the nth packet fails to be transmitted, the codec at the receiving end recovers the service content corresponding to the first n-1 packets based on the first n-1 packets, that is, when the receiving end receives a portion of packets with a relatively early sequence in the PDU Set, it can recover the content corresponding to the PDU Set, where n is a positive integer.
- the position of the first lost packet in the PDU Set will affect whether the receiving end can decode the content corresponding to the PDU Set, and packets with a relatively early sequence in the PDU Set have a higher transmission priority.
- the PDU Set can be a media frame, and the corresponding service content is a frame of picture during media playback.
- the receiving end can recover part of the content of the picture frame corresponding to the first n-1 packets based on the first n-1 packets.
- the present application proposes a protocol data unit set transmission method to achieve efficient transmission of the protocol data unit set.
- the first device transmits a set of protocol data units to the second device.
- the protocol data unit set may include multiple uplink data packets, and the first device may be a terminal device and the second device may be an access network device; or, the first device may be an access network device and the second device may be a user plane network element; or, the first device may be a user plane network element and the second device may be a data network or an application server.
- the protocol data unit set may include multiple downlink data packets, and the first device may be a user plane network element, and the second device may be an access network device; or, the first device may be an access network device, and the second device may be a terminal device.
- the protocol data unit set is a protocol data unit set of a service used on a terminal.
- the service used on the terminal may be a media service, such as the currently emerging virtual reality (VR), augmented reality (AR), mixed reality (MR) or cloud gaming services.
- VR virtual reality
- AR augmented reality
- MR mixed reality
- cloud gaming services such as the currently emerging virtual reality (VR), augmented reality (AR), mixed reality (MR) or cloud gaming services.
- the method includes:
- Step 200 During the process of a first device transmitting a protocol data unit set of a service used on a terminal device to a second device, the first device determines that the transmission of a first data packet in the protocol data unit set fails.
- the first data packet is the first data packet in the protocol data unit set that fails to be transmitted.
- data is transmitted between the terminal device and the application server through the 5G network, wherein the first device transmits a set of protocol data units of the service used on the terminal device to the second device, and the first device determines that the transmission of the first data packet in the set of protocol data units has failed. For example, when the first device determines that the number of retransmissions of the first data packet exceeds a retransmission number threshold, the first device determines that the transmission of the first data packet in the set of protocol data units has failed; or, when the first device determines that the transmission duration of the first data packet exceeds a transmission duration threshold, the first device determines that the transmission of the first data packet in the set of protocol data units has failed.
- determining that the first data packet transmission fails includes: determining that the delay of the data packet transmission exceeds the data packet delay budget of the data packet.
- the radio link control (RLC) layer does not have time to send the data packet to the media access control (MAC) layer for transmission, that is, after the PDB time has expired, the data packet is still in the RLC layer cache, then it is determined that the data packet has exceeded the PDB and has not been scheduled for transmission, that is, it is determined that the data packet is lost or the transmission fails.
- RLC radio link control
- MAC media access control
- the access network device can determine whether the data packet is successfully transmitted based on the feedback from the terminal device. For example, when a data packet is transmitted through the MAC layer, the MAC layer may split and reassemble the upper layer data packet to ensure that it is suitable for channel transmission. The MAC layer saves the mapping relationship between the data packet and the MAC layer transmission data block. The MAC layer determines whether the data packet is successfully transmitted based on the feedback of the hybrid automatic repeat request (HARQ).
- HARQ hybrid automatic repeat request
- the first device may also determine that the transmission of the first data packet in the protocol data unit set fails in other ways, which is not limited in this application.
- Step 210 The first device discards the data packet in the protocol data unit set whose sequence number is greater than the sequence number of the first data packet.
- the first device may learn the sequence number of each data packet, and after determining that the first data packet fails to be transmitted, discard the data packets in the protocol data unit set whose sequence numbers are greater than the sequence number of the first data packet.
- the sequence number of the data packet may represent the order of the data packets in the protocol data unit.
- the first device may also receive first indication information from the session management network element, where the first indication information is used to indicate that when a data packet with a large sequence number in the protocol data unit set is determined to have failed to be transmitted during the transmission of the protocol data unit set, the data packet with a large sequence number in the protocol data unit set is discarded. Therefore, the first device may discard the data packets with sequence numbers greater than the sequence number of the first data packet in the protocol data unit set after determining that the first data packet fails to be transmitted, based on the sequence number of the data packet according to the first indication information.
- the application function network element may send first indication information to the policy control network element, and the policy control network element may send policy control and charging (PCC) rules to the session management network element, where the PCC rules include the first indication information.
- PCC policy control and charging
- the first device may determine the sequence number of the data packet in the following manner, but not limited to:
- the first device can determine the order of the multiple uplink data packets.
- the first device determines the sequence number of the uplink data packet according to the sequence number (SN) of the Real-time Transport Protocol (RTP) header of the uplink data packet. Furthermore, the first device can add the sequence number of the uplink data packet to the header of each uplink data packet in the above-mentioned multiple uplink data packets.
- the header of each uplink data packet is a packet data convergence protocol (PDCP) layer header or a service data adaptation protocol (SDAP) layer header.
- PDCP packet data convergence protocol
- SDAP service data adaptation protocol
- the first device is a user plane network element.
- the first device can determine the order of the multiple downlink data packets. For example, the first device distinguishes different protocol data unit sets based on the boundary field "M" bit or timestamp of the RTP header of the downlink data packet, and determines the sequence number of the downlink data packet within the protocol data unit set based on the SN of the RTP header. Furthermore, the first device can add the sequence number of the downlink data packet to the header of each downlink data packet in the above-mentioned multiple downlink data packets.
- the header of each downlink data packet is a GTP-U layer header.
- the access network device may determine the sequence number of the data packet according to the header of the data packet.
- the access network device can determine the sequence number of the data packet based on the PDCP layer or SDAP layer header of the data packet. If the protocol data unit set includes multiple downlink data packets, the access network device can determine the sequence number of the data packet based on the GTP-U layer or RTP layer header of the data packet.
- the first device may also determine a plurality of data packets belonging to the protocol data unit set, specifically in but not limited to the following manner:
- Mode 1 When the received second data packet includes a preset field and the received third data packet includes the same preset field, the first device determines that a data packet received after the second data packet to the third data packet belong to a protocol data unit set. That is, two adjacent protocol data unit sets can be separated by a preset field. In addition, it should be noted that the data packet received after the second data packet to the data packet received before the third data packet does not include the preset field.
- the first device receives data packet 1, which includes a preset field. After receiving data packet 1, the first device also receives data packets 2 to 11, wherein data packet 11 also includes the preset field, and data packets 2 to 11 constitute a protocol data unit set. Among them, data packets 2 to 10 do not include the preset field.
- the preset field here may be the "M" field of the Real-time Transport Protocol (RTP) header.
- RTP Real-time Transport Protocol
- the value of the "M” field in the second data packet and the third data packet is "1"
- the value of the "M” field in the data packet whose sequence number is greater than the sequence number of the second data packet and less than the sequence number of the third data packet is "0". That is, the "M" field is used to indicate the boundary of the current protocol data unit set.
- Case 1 The data packet belonging to the protocol data unit set arrives at the first device later than the third data packet.
- the protocol data unit set here is the protocol data unit set including the third data packet.
- the first device receives data packet 1, which includes a preset field. After receiving data packet 1, the first device also sequentially receives data packet 2, data packet 3, data packet 5, data packet 6, data packet 9, data packet 4, data packet 7, data packet 10, and data packet 11, wherein data packet 11 includes the preset field. After receiving data packet 11, the first device also receives data packet 8.
- the third data packet may not be the last received data packet in the protocol data unit set.
- Case 2 A data packet that does not belong to the protocol data unit set arrives at the first device earlier than the third data packet.
- the protocol data unit set here is a protocol data unit set including the third data packet.
- the first device receives data packet 1, which includes a preset field. After receiving data packet 1, the first device also sequentially receives data packet 2, data packet 3, data packet 5, data packet 6, data packet 7, data packet 4, data packet 9, data packet 10, data packet 8, data packet 15, and data packet 11, wherein data packet 11 includes the preset field. Before receiving data packet 11, the first device also receives data packet 15.
- situation 1 and situation 2 can also be combined, that is, there is a data packet belonging to the protocol data unit set that arrives at the first device later than the third data packet, and there is a data packet not belonging to the protocol data unit set that arrives at the first device earlier than the third data packet.
- the first device can also jointly determine the protocol data unit set according to the SN of the RTP header and the M field.
- the first device can determine the sequence number of the first data packet in the protocol data unit set according to the SN of the RTP header of the second data packet, that is, the SN of the RTP header of the second data packet plus 1, and since the third data packet includes the M field, the sequence number of the last data packet in the protocol data unit set is determined according to the SN of the RTP header of the third data packet, that is, the SN of the RTP header of the third data packet.
- the first device can determine the sequence number of the first data packet and the sequence number of the last data packet in the protocol data unit set, so that even in a scenario where the data packets are out of order, the data packets included in the protocol data unit set can be accurately determined.
- the first device can determine whether all the data packets in the protocol data unit set have arrived based on the SN of the third data packet and the SN of other data packets that have arrived. That is, whether all the data packets with sequence numbers greater than the SN of the second data packet and less than or equal to the SN of the third data packet have arrived, or whether all the data packets after the second data packet and before the third data packet have arrived. If yes, it is determined that all the data packets in the protocol data unit set have arrived; if not, it is further determined which data packet or packets have not arrived yet, and wait for the above-mentioned unreached data packets to arrive at the first device.
- the first device receives data packet 1, which includes a preset field. After receiving data packet 1, the first device also receives data packet 2, data packet 3, data packet 5, data packet 6, data packet 9, data packet 4, data packet 7, data packet 10 and data packet 11 in sequence, wherein data packet 11 includes the preset field.
- the first device determines that the sequence number of the first data packet in the protocol data unit set is 2(1+1) based on data packet 1, and determines that the sequence number of the last data packet in the protocol data unit set is 11 based on the sequence number of data packet 11, that is, the data packets from sequence number 2 to sequence number 11 are the data packets included in the protocol data unit set. Further, the first device determines that the currently received data packet does not include data packet 8, therefore, the first device waits for data packet 8, and after data packet 8 arrives, the first device determines that all the data packets in the protocol data unit set have arrived.
- the first device receives data packet 1, which includes a preset field. After receiving data packet 1, the first device also receives data packet 2, data packet 3, data packet 5, data packet 6, data packet 7, data packet 4, data packet 9, data packet 10, data packet 8, data packet 15 and data packet 11 in sequence, wherein data packet 11 includes the preset field.
- the first device determines that the sequence number of the first data packet in the protocol data unit set is 2(1+1) based on data packet 1, and determines that the sequence number of the last data packet in the protocol data unit set is 11 based on the sequence number of data packet 11, that is, the data packets with sequence numbers 2 to 11 are the data packets included in the protocol data unit set.
- the first device determines that the currently received data packet already includes the data packets with sequence numbers 2 to 11, determines that all the data packets in the protocol data unit set have arrived, and the first device does not regard data packet 15 as a data packet in the protocol data unit set.
- the first device determines that the last received data packet before the second data packet to the third data packet belongs to the protocol data unit set.
- the first device determines that data packets received between the first received data packet including the preset field and the data packet including the same preset field belong to data packets of the same protocol data unit set.
- Mode 2 When the received second data packet includes the preset field A and the received third data packet includes the preset field B, the first device determines that the second data packet to the third data packet belong to the protocol data unit set. That is, the protocol data unit set can be determined by the preset field. Among them, the preset field A can also be called the first packet field, and the preset field B can also be called the tail packet field.
- the first device receives data packet 1, which includes a preset field A. After receiving data packet 1, the first device also receives data packets 2 to 11, wherein data packet 11 also includes a preset field B. Then data packets 1 to 11 constitute a protocol data unit set. Among them, data packets 2 to 10 do not include the preset field A or the preset field B, that is, the preset fields A and preset fields B corresponding to data packets 2 to 10 are all set to 0.
- the preset field A here may be the "S" field in the RTP header extension
- the preset field B may be the "E” field in the RTP header extension.
- the value of the "S” field in the second data packet is "1”
- the value of the "E” field in the third data packet is "1”.
- the value of the "E” field in the data packet whose sequence number is greater than the sequence number of the second data packet and less than the sequence number of the third data packet is "0”
- the value of the "S” field is "0".
- the first device can determine the sequence number of the first data packet in the protocol data unit set according to the SN of the RTP header of the second data packet, that is, the SN of the RTP header of the second data packet. Since the third data packet includes the preset field B, the sequence number of the last data packet in the protocol data unit set is determined according to the SN of the RTP header of the third data packet, that is, the SN of the RTP header of the third data packet. Therefore, the first device can determine the first number in the protocol data unit set. The sequence number of the first data packet and the sequence number of the last data packet can be used to accurately determine the data packets included in the protocol data unit set even in a scenario where the data packets are out of order.
- Mode 3 The first device determines that data packets with the same timestamp belong to the same protocol data unit set.
- the first device receives 20 data packets, among which the 1st to 12th data packets include the same timestamp 1, and the 13th to 20th data packets include the same timestamp 2. Then the data packets including timestamp 1 constitute a protocol data unit set, and the data packets including timestamp 2 constitute another protocol data unit set.
- the timestamp may be generated by a terminal device, and for a downlink data packet, the timestamp may be generated by an application server.
- the timestamp here may be a "timestamp" field in an RTP header, which may indicate the time when the media frame or media segment is generated or collected.
- the first device determines that the multiple data packets include the same preset field, and then determines that the multiple data packets belong to the same protocol data unit set.
- the preset field can be an identifier of the protocol data unit set, or any form of value indicating that the multiple data packets are data packets of the same protocol data unit set.
- the first device discards the data packet with a sequence number greater than the sequence number of the first data packet
- the first device determines that there are still data packets with a sequence number less than the sequence number of the first data packet that have not been transmitted or have not been successfully transmitted
- the first device continues to transmit data packets with sequence numbers less than the sequence number of the first data packet. That is, the first device discards the data packets after the first data packet in the protocol data unit set, and continues to transmit the data packets before the first data packet.
- the data packets that have not been transmitted in the same protocol data unit set and whose sequence numbers are greater than the sequence number of the data packet that fails to transmit are discarded, thereby avoiding the resource overhead caused by transmitting and receiving subsequent data packets.
- the first device may adopt but is not limited to the following methods to ensure the transmission of the data packets with earlier sequence numbers:
- Mode A The first device transmits multiple data packets in the protocol data unit set in ascending order according to their sequence numbers.
- the first device ensures the transmission of the data packets with earlier sequence numbers, or uses the resources used for the transmission of the data packets with later sequence numbers to transmit the data packets with earlier sequence numbers.
- the first device can, in the process of transmitting the protocol unit data, give priority to scheduling transmission resources to ensure the transmission of the data packets with the leading sequence numbers.
- the transmission is scheduled and transmitted packet by packet according to the transmission order, and before the transmission of the leading data packets is successful, the transmission scheduling of the subsequent data packets will not be performed again, thereby ensuring that the transmission resources can be used to ensure the successful transmission of the data packets with the leading sequence numbers.
- the first device simultaneously configures corresponding resources for data packet #1, data packet #2, and data packet #3 for scheduling and transmission. After the transmission of data packet #2 fails, the subsequent transmission resources are given priority to data packet #2 for retransmission until the transmission of data packet #2 is successful, and the transmission scheduling of the subsequent data packets is performed again.
- Method B The first device transmits multiple data packets in a protocol data unit set through two QoS flows respectively, where the priority of one QoS flow is higher than the priority of the other QoS flow, and the sequence number of the data packet carried by the QoS flow with higher priority is smaller than the sequence number of the data packet carried by the QoS flow with lower priority.
- the first device transmits the first part of the data packets through the first QoS stream according to the first identifier, and transmits the second part of the data packets through the second QoS stream according to the second identifier.
- the protocol data unit set includes the first part of the data packets and the second part of the data packets. The first part of the data packets and the second part of the data packets are not repeated.
- the priority of the first part of the data packets is higher than the priority of the second part of the data packets
- the header of each data packet in the first part of the data packets includes the first identifier
- the header of each data packet in the second part of the data packets includes the second identifier
- the ratio of the total number of the first part of the data packets to the total number of the data packets included in the protocol data unit set is greater than or equal to the preset ratio of the transmission success rate.
- the sequence number of the data packet carried by the QoS flow with higher priority is smaller than the sequence number of the data packet carried by the QoS flow with lower priority, which can be understood as the sequence number of the first part of the data packets carried by the first QoS flow is smaller than the sequence number of the second part of the data packets carried by the second QOS flow, or the maximum sequence number of the data packet in the first part of the data packets carried by the first QoS flow is smaller than the minimum sequence number of the data packet in the second part of the data packets carried by the second QOS flow, or the first part of the data in the front of the protocol data unit is carried by the first QoS flow, and the second part of the data in the back of the protocol data unit is carried by the second QoS flow.
- the preset ratio of the transmission success rate can be understood as the ratio of the minimum number of data packets that need to be successfully transmitted in a protocol data unit to the total number of data packets included in the protocol data unit.
- the data packets that need to be successfully transmitted are the data packets with the earliest sequence numbers, or described as, the sequence numbers of the data packets that need to be successfully transmitted are all smaller than the sequence numbers of the data packets other than the data packets that need to be successfully transmitted.
- the maximum sequence number of the data packets that need to be successfully transmitted is smaller than the minimum sequence number of the data packets other than the data packets that need to be successfully transmitted.
- the minimum number of successful data packets can be determined based on actual transmission needs or decoding requirements.
- the first device receives second indication information from the session management network element, and the second indication information indicates a preset ratio of the transmission success rate.
- the application function network element may send the second indication information to the policy control network element, and the policy control network element sends a PCC rule to the session management network element, and the PCC rule includes the second indication information.
- the preset ratio of the transmission success rate is preconfigured on the first device side.
- the first device can also determine the first part of the data packets and the second part of the data packets according to the preset ratio of the transmission success rate, and add a first identifier to the header of each data packet in the first part of the data packets, and add a second identifier to the header of each data packet in the second part of the data packets.
- the first identifier can be the identifier of the first QoS flow
- the second identifier can be the identifier of the second QoS flow.
- the first device is a user plane network element, and the header of each data packet is a GTP-U layer header; if the protocol data unit set includes multiple uplink data packets, the first device is a terminal device, and the header of each data packet is a PDCP layer or SDAP layer header.
- the terminal device can also determine the first part of the data packets and the second part of the data packets based on the preset ratio of the transmission success rate, and add a first identifier to the header of each data packet in the first part of the data packets, and add a second identifier to the header of each data packet in the second part of the data packets.
- the user plane network element can also determine the first part of the data packets and the second part of the data packets according to the preset ratio of the transmission success rate, and add a first identifier to the header of each data packet in the first part of the data packets, and add a second identifier to the header of each data packet in the second part of the data packets.
- the first identifier can be the identifier of the first QoS flow
- the second identifier can be the identifier of the second QoS flow.
- the protocol data unit set includes multiple uplink data packets
- the terminal device when the terminal device adds a first identifier to each data packet in the first part of the data packets, and adds a second identifier to each data packet in the second part of the data packets, the first identifier can also be an identifier of the first priority, and the second identifier can also be an identifier of the second priority, wherein the first priority is higher than the second priority.
- the first device can give priority to the transmission of the data packet with the first priority identifier based on the first priority identifier and the second priority identifier.
- the downlink data packet from the application server (AS) first arrives at the UPF side and is sent to the RAN side through the N3 interface, and then sent to the UE side through the Uu interface.
- AS application server
- S301 The AF sends first indication information to the PCF.
- the first indication information is used to indicate that when a data packet that fails to be transmitted is determined during the process of transmitting the PDU Set in the data stream of the service used by the terminal device, the data packet whose sequence number in the PDU Set is greater than the sequence number of the data packet that fails to be transmitted is discarded.
- AF also provides service flow description information for characterizing the characteristic information of the service flow
- the service flow description information includes IP five-tuple information (source IP address, target IP address, source port number, target port number, transport protocol) or three-tuple information (target IP address, target port number, transport protocol), application identifier, etc.
- the service flow description information is provided to ensure that the target service flow corresponding to the service flow description information is processed accordingly.
- AF sends the first indication information to PCF through the capability exposure interface. If AF is in the trusted domain, AF can interact with PCF directly, that is, by calling the service interface of PCF, such as Npcf_PolicyAuthorization service interface; if AF is in the untrusted domain, AF needs to interact with PCF through NEF, AF calls the service interface of NEF, such as Nnef_AFSessionWithQoS service interface, and NEF calls the service interface of PCF.
- NEF service interface of PCF
- S302 UE sends a PDU session establishment request to AMF.
- the UE When the UE initiates the PDU session establishment or PDU session modification process, the UE sends a PDU session establishment request or a PDU session modification request to the AMF.
- the PDU session establishment process is used as an example for explanation.
- the UE sends a PDU session modification or PDU session establishment request to the RAN side through a NAS message, and the RAN sends the NAS message to the AMF side.
- S303 AMF sends a PDU session establishment request to SMF.
- the AMF sends a PDU session modification request from the UE side to the SMF.
- the SMF sends a session management policy association establishment request message to the PCF.
- the session management policy association establishment request message is used to request PCC rules.
- the PCF sends a session management policy association establishment response message to the SMF.
- the session management policy association establishment response message includes a PCC rule, wherein the PCC rule includes the first indication information.
- the session management policy association establishment response message includes the PCC rule or the first indication information.
- the SMF initiates the session management policy association establishment process. If the UE initiates the PDU session modification process, the SMF initiates the session management policy association modification process. In addition, if S302 is not executed, the PCF can actively initiate the session management policy association modification process and send the PCC rules to the SMF.
- S306 SMF sends first indication information to RAN.
- the SMF sends the first indication information to the RAN through the AMF.
- SMF generates corresponding QoS description information (QoS profile) based on the PCC rules from the PCF side.
- SMF also sends the QoS Profile to the RAN side to clarify the corresponding QoS processing for the specified QoS flow.
- the SMF also sends a first notification message to the RAN, which is also used to instruct the RAN to determine which downlink data packets belong to the same PDU Set and the order of the downlink data packets in the PDU Set based on the header information of the GTP-U layer of the downlink data packets.
- the UE may also send the first indication information to the RAN. In this case, the previous steps are all optional processes.
- S307 SMF sends the first indication information to UPF.
- the SMF sends the first indication information to the UPF according to the PCC rule from the PCF side.
- the SMF sends the N4 rule to the UPF, and the N4 rule can be carried to the UPF through the N4 session establishment or modification process, and the N4 rule can include the first indication information.
- the N4 rule may also include the identification and marking scheme of the PDU Set, that is, how to identify which downlink data packets belong to the same PDU Set and the order of the downlink data packets within the PDU Set, and mark them in the GTP-U layer header of the downlink data packet.
- the application server When the downlink media service starts, that is, the downlink service data stream of the terminal device starts to be transmitted, for example, for the XR service, the application server will generate corresponding downlink media data after receiving the uplink data from the terminal device, and send the downlink media data to the terminal device side through the 5G network, and execute the following S308 to S313.
- UPF receives a downlink data packet in the downlink service data flow of the terminal device from the AS, that is, the UPF receives a downlink data packet sent from the AS to the UE.
- UPF determines which downlink data packets belong to the same PDU Set and the order of the data packets in the PDU Set according to the N4 rule. UPF determines the order of each downlink data packet in the PDU Set, including determining the sequence number of each downlink data packet, i.e., the PDU sequence number (PDU Sequence Number, PDU SN).
- the UPF may determine the following contents based on the RTP header information:
- the order of the downlink data packets in the PDU Set is determined by the SN in the RTP header of the downlink data packet, that is, the sequence number of each downlink data packet is determined.
- the UPF After completing the identification of the PDU Set and the order of downlink data packets within the PDU Set, the UPF adds the sequence number of each downlink data packet to the GTP-U layer header of the downlink data packet.
- UPF can also map the order of data packets in the PDU Set to corresponding transmission priorities and add them to the GTP-U layer header of the downlink data packet.
- UPF can also add the PDU Set identification information to which the downlink data packet belongs to the GTP-U layer header.
- UPF transmits downlink data packets to RAN in ascending order according to the sequence numbers of the downlink data packets in the PDU Set.
- the UPF directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the downlink data packet.
- This step is optional.
- S312 RAN determines which downlink data packets belong to the same PDU Set and the order of the downlink data packets in the PDU Set based on the GTP-U layer header information of the downlink data packets.
- S313 RAN transmits the downlink data packets to the UE according to the sequence numbers of the downlink data packets in ascending order.
- the RAN directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the downlink data packet.
- the PDU Set in the data flow of the service used by the UE includes multiple uplink data packets, and when the transmission protocol data unit set is transmitted using the above-mentioned method A, the uplink media data packet from the UE is sent to the UPF side through the RAN, and then sent to the AS side by the UPF. That is, after the XR service used by the UE starts, such as the AR service, the UE side will collect local media data and send it to the UPF side through the RAN, and then send it to the application server side accordingly.
- the specific process is as follows:
- S401 to S405 may refer to the above-mentioned S301 to S305.
- S406 SMF sends first indication information to the UE.
- SMF sends the first indication information to the UE side through AMF.
- the SMF also sends a second notification message to the UE, and the second notification message is used for the identification and marking scheme of the PDU Set, that is, how to identify which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set, and mark them in the header of the PDCP layer or SDAP layer of the uplink data packet.
- the SMF sends first indication information to the RAN.
- the SMF sends the first indication information to the RAN through the AMF.
- SMF generates corresponding QoS description information (QoS profile) based on the PCC rules from the PCF side.
- SMF also sends the QoS Profile to the RAN side to clarify the corresponding QoS processing for the specified QoS flow.
- the SMF also sends a first notification message to the RAN, which is also used to instruct the RAN to determine which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set based on the header information of the PDCP layer or SDAP layer of the uplink data packets.
- the UE may also send the first indication information to the RAN. In this case, the previous steps are all optional processes.
- S408 SMF sends the first indication information to UPF.
- the SMF sends the first indication information to the UPF according to the PCC rule from the PCF side.
- the SMF sends the N4 rule to the UPF, and the N4 rule can be carried to the UPF through the N4 session establishment or modification process, and the N4 rule can include the first indication information.
- the UE identifies the uplink data packets in the uplink data flow of the service from the terminal application layer, determines which PDU data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set, and the UE determines the order of each uplink data packet in the PDU Set, that is, determines the sequence number of each uplink data packet in the protocol data unit set.
- the UE may determine the following contents according to the RTP header information:
- the UE After completing the identification of the PDU Set and the order of the uplink data packets in the PDU Set, the UE adds the sequence number of each uplink data packet to the PDCP layer or SDAP layer header of the uplink data packet.
- the UE may also map the order of the uplink data packets in the PDU Set to corresponding transmission priorities and add them to the uplink data packets, such as the PDCP layer or SDAP layer header of the data packets.
- S411 The UE transmits uplink data packets to the RAN in ascending order according to the sequence numbers of the uplink data packets in the PDU Set.
- the UE directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the uplink data packet, that is, discards other data packets after the uplink data packet in the PDU Set.
- S412 RAN determines which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set based on the header information of the PDCP layer of the uplink data packets.
- S413 RAN transmits uplink data packets to UPF in ascending order according to the sequence numbers of the uplink data packets in PDU Set.
- the RAN directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the uplink data packet.
- the RAN adds corresponding information to the GTP-U layer of the uplink data packet according to the sequence number of the uplink data packet in the PDU Set and the identification information of the PDU Set, thereby ensuring that the UPF can identify the corresponding PDU Set and the order of the PDU data packets therein.
- UPF determines which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set based on the header information of the GTP-U layer of the uplink data packets or the header information of the RTP layer of the uplink data packets.
- UPF transmits uplink data packets to AS in ascending order according to the sequence numbers of the uplink data packets in PDU Set.
- the UPF directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the uplink data packet.
- This step is optional.
- the downlink data packet from the AS first arrives at the UPF side and is sent to the RAN side through the N3 interface, and then sent to the UE side through the Uu interface.
- the specific process is as follows:
- S501 The AF sends first indication information and second indication information to the PCF.
- the second indication information is used for a preset ratio of the transmission success rate.
- AF will also provide service flow description information to characterize the characteristic information of the service flow.
- the service flow description information includes IP five-tuple information (source IP address, destination IP address, source port number, destination port number, transmission protocol) or triplet information (destination IP address, destination port number, transmission protocol), application identifier, etc.
- the service flow description information is provided to ensure that the target service flow corresponding to the service flow description information is processed accordingly.
- AF sends the first indication information to PCF through the capability exposure interface. If AF is in the trusted domain, AF can interact with PCF directly, that is, by calling the service interface of PCF, such as Npcf_PolicyAuthorization service interface; if AF is in the untrusted domain, AF needs to interact with PCF through NEF, AF calls the service interface of NEF, such as Nnef_AFSessionWithQoS service interface, and NEF calls the service interface of PCF.
- NEF service interface of PCF
- S502 The UE sends a PDU session establishment request message to the AMF.
- the UE When the UE initiates the PDU session establishment or PDU session modification process, the UE sends a PDU session establishment request message or a PDU session modification request message to the AMF.
- PDU session establishment process is used as an example for explanation.
- the UE sends a PDU session establishment request message or a session modification request message to the RAN side via a NAS message, and the RAN then sends the NAS message to the AMF side.
- S503 AMF sends a PDU session establishment request from the UE side to SMF.
- the AMF sends a PDU session modification request from the UE side to the SMF.
- the SMF sends a session management policy association establishment request message to the PCF.
- the session management policy association establishment request message is used to request PCC rules.
- S505 PCF sends a session management policy association establishment response message to SMF.
- the session management policy association establishment response message includes the first indication information and the second indication information, which may specifically include the following scenarios:
- the session management policy association establishment response message includes a PCC rule, wherein the PCC rule includes first indication information and second indication information.
- the session management policy association establishment response message includes the PCC rule, the first indication information and the second indication information.
- the session management policy association establishment response message includes the PCC rule and the first indication information, and the PCC rule includes the second indication information.
- the session management policy association establishment response message includes the PCC rule and the second indication information, and the PCC rule includes the first indication information.
- the second indication information can also be pre-configured to the UE or UPF in a pre-configured manner.
- the session management policy association establishment response message only includes the first indication information.
- the first indication information can be within the PCC rule or outside the PCC rule. This application does not limit this.
- the following is only an example of the session management policy association establishment response message including the first indication information and the second indication information. That is, the session management policy association establishment response message can carry the first indication information and the second indication information in any of the above (1) to (4) methods.
- the SMF initiates the session management policy association establishment process, and if the UE initiates the PDU session modification process, the SMF initiates the session management policy association modification process.
- the PCF can actively initiate the session management policy association modification process and send the PCC rules to the SMF.
- the PCC rule may also indicate the creation of two QoS flows, which carry the first part of the data packets and the second part of the data packets of each PDU set respectively.
- the first part of the data packets is carried by the first QoS flow
- the second part of the data packets is carried by the second QoS flow.
- the priority of the first QoS flow is higher than the priority of the second QoS flow.
- the first part of the data packets and the second part of the data packets are determined according to a preset ratio of the transmission success rate.
- the first part of the data packets belongs to the part with the preset ratio of the transmission success rate in the PDU Set, and the second part of the data packets belongs to other data packets in the PDU Set.
- the SMF sends the first indication information and the second indication information to the RAN.
- the SMF sends the first indication information and the second indication information to the RAN through the AMF.
- the SMF may also generate configuration information of two QoS flows according to the PCC rule, and send the configuration information of the two QoS flows to the RAN.
- the SMF also sends a first notification message to the RAN, which is also used to instruct the RAN to determine which downlink data packets belong to the same PDU Set and the order of the downlink data packets in the PDU Set based on the header information of the GTP-U layer of the downlink data packets, as well as to determine the data packets carried by the first QoS flow and the data packets carried by the second QoS flow.
- the UE may also send the first indication information and the second indication information to the RAN.
- S507 SMF sends the first indication information and the second indication information to UPF.
- the SMF sends the first indication information and/or the second indication information to the UPF according to the PCC rule from the PCF side.
- the SMF sends the N4 rule to the UPF, and the N4 rule can be carried to the UPF through the N4 session establishment or modification process, and the N4 rule can include the first indication information and the second indication information.
- the N4 rule may also include dividing the PDU Set into a first part of data packets and a second part of data packets according to a preset ratio of the transmission success rate indicated by the second indication information, and adding an identifier of the first QoS flow to the header of the GTP-U layer of the first part of the data packets, and adding an identifier of the second QoS flow to the header of the GTP-U layer of the second part of the data packets.
- the N4 rule may also include the identification and marking scheme of the PDU Set, that is, how to identify which downlink data packets belong to the same PDU Set and the order of the downlink data packets within the PDU Set, and mark them in the GTP-U layer header of the downlink data packet.
- the application server When the downlink media service starts, that is, the downlink service data flow of the terminal device starts to be transmitted, for example, for the XR service, the application server will generate corresponding downlink media data after receiving the uplink data from the terminal device, and send the downlink media data to the terminal device side through the 5G network, and execute the following S508 to S514.
- the UPF receives a downlink data packet in a downlink service data flow sent from the AS to the UE side.
- UPF determines which downlink data packets belong to the same PDU Set and the order of the data packets in the PDU Set according to the N4 rule. UPF determines the order of each downlink data packet in the PDU Set, including determining the sequence number of each downlink data packet.
- the UPF After completing the identification of the PDU Set and the order of the downlink data packets in the PDU Set, the UPF adds the sequence number of each downlink data packet to the GTP-U layer header of the downlink data packet.
- UPF can also map the order of data packets in the PDU Set to corresponding transmission priorities and add them to the GTP-U layer header of the downlink data packet.
- UPF divides the PDU Set into a first part of data packets and a second part of data packets according to a preset ratio of transmission success rate, wherein the first part of data packets are data packets with a preset proportion at the front in the PDU Set, and the second part of data packets are other subsequent data packets; UPF adds the identifier of the first QoS flow to the header of the GTP-U layer of the first part of data packets, and adds the identifier of the second QoS flow to the header of the GTP-U layer of the second part of data packets.
- UPF transmits the first part of the data packets through the first QoS flow according to the identifier of the first QoS flow, and transmits the second part of the data packets through the second QoS flow according to the identifier of the second QoS flow.
- the UPF directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the downlink data packet, that is, the UPF directly discards other data packets after the data packet.
- S513 RAN determines which downlink data packets belong to the same PDU Set and the order of the downlink data packets in the PDU Set based on the header information of the GTP-U layer of the downlink data packets, and determines the data packets carried by the first QoS flow and the data packets carried by the second QoS flow.
- the RAN transmits the first part of the data packets through the first QoS flow according to the identifier of the first QoS flow, and transmits the second part of the data packets through the second QoS flow according to the identifier of the second QoS flow.
- the RAN will directly discard the data packet in the PDU set whose sequence number is greater than the sequence number of the downlink data packet. That is, the RAN will collaboratively process the same PDU Set in two QoS flows. When it is found that the transmission of a downlink data packet has failed, the data packet in the PDU Set whose sequence number is greater than the sequence number of the downlink data packet will be discarded.
- the uplink media data packet from the UE is sent to the UPF side through the RAN, and then sent to the AS side by the UPF. That is, after the XR service used by the UE starts, such as the AR service, the UE side will collect local media data and send it to the UPF side through the RAN, and then send it to the application server side accordingly.
- the specific process is as follows:
- S601 to S605 may refer to the above-mentioned S501 to S505.
- the SMF sends first indication information and second indication information to the UE.
- the SMF also sends two sets of QoS rules to the UE.
- the two QoS flows corresponding to the two QoS rules carry the first part of the data packets and the second part of the data packets of each PDU set respectively.
- the first part of the data packets is carried by the first QoS flow
- the second part of the data packets is carried by the second QoS flow.
- the priority of the first QoS flow is higher than the priority of the second QoS flow.
- the first part of the data packets and the second part of the data packets are determined according to the preset ratio of the transmission success rate, that is, the first part of the data packets are the first preset proportion of data packets in the PDU Set, and the second part of the data packets are the subsequent data packets in the PDU Set.
- the SMF also sends a second notification message to the UE, and the second notification message is used for the identification and marking scheme of the PDU Set, that is, how to identify which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set, and mark them in the header of the PDCP layer of the uplink data packet, and divide the PDU Set into a first part of data packets and a second part of data packets according to a preset ratio of the transmission success rate indicated by the second indication information, and add the identifier of the first QoS flow to the header of the SDAP layer of the first part of the data packet, and add the identifier of the second QoS flow to the header of the SDAP layer of the second part of the data packet.
- the identification and marking scheme of the PDU Set that is, how to identify which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set, and mark them in the header of the PDCP layer of the up
- the SMF sends the first indication information and the second indication information to the RAN.
- the SMF sends the first indication information and the second indication information to the RAN through the AMF.
- the SMF also sends a first notification message to the RAN, which is also used to instruct the RAN to determine which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set based on the header information of the PDCP layer or SDAP layer of the uplink data packets, as well as to determine the data packets carried by the first QoS flow and the data packets carried by the second QoS flow.
- the UE may also send the first indication information and the second indication information to the RAN.
- S608 SMF sends the first indication information and the second indication information to UPF.
- the SMF sends the first indication information and the second indication information to the UPF according to the PCC rule from the PCF side.
- the SMF sends the N4 rule to the UPF, and the N4 rule can be carried to the UPF through the N4 session establishment or modification process, and the N4 rule can include the first indication information and the second indication information.
- the terminal device When the uplink media service starts, that is, the uplink service data stream of the terminal device starts to be transmitted, for example, after the XR service starts, the terminal device will send the uplink data from the XR service to the application server side through the 5G network. Execute the following S609 to S616.
- the UE identifies the uplink data packets in the uplink service data flow of the terminal device from the terminal application layer, determines which PDU data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set, and determines the order of each uplink data packet in the PDU Set.
- the sequence determines the sequence number of each uplink data packet.
- the UE After completing the identification of the PDU Set and the order of the uplink data packets in the PDU Set, the UE adds the sequence number of each uplink data packet to the PDCP layer header of the uplink data packet.
- the UE can also map the order of the uplink data packets in the PDU Set to corresponding transmission priorities and add them to the PDCP layer header of the uplink data packets.
- the UE divides the PDU Set into a first part of data packets and a second part of data packets according to a preset ratio of transmission success rates, and adds a first QoS flow identifier to the SDAP layer header of the first part of data packets, and adds a second QoS flow identifier to the SDAP layer header of the second part of data packets. That is, the first part of data packets are data packets with a preset ratio in front of the PDU Set, and the second part of data packets are subsequent data packets in the PDU Set.
- the UE transmits the first part of the data packets through the first QoS flow according to the identifier of the first QoS flow, and transmits the second part of the data packets through the second QoS flow according to the identifier of the second QoS flow.
- the UE directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the uplink data packet, that is, discards the other data packets after the data packet with failed transmission in the PDU Set.
- S613 RAN determines which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set based on the header information of the PDCP layer of the uplink data packets, and determines the data packets carried by the first QoS flow and the data packets carried by the second QoS flow based on the header information of the SDAP layer of the uplink data packets.
- the RAN transmits the first part of the data packets through the first QoS flow according to the identifier of the first QoS flow, and transmits the second part of the data packets through the second QoS flow according to the identifier of the second QoS flow.
- the RAN directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the uplink data packet.
- the RAN adds corresponding information to the GTP-U layer of the uplink data packet according to the sequence number of the uplink data packet in the PDU Set and the identification information of the PDU Set, thereby ensuring that the UPF can identify the corresponding PDU Set and the order of the PDU data packets therein.
- UPF determines which uplink data packets belong to the same PDU Set and the order of the uplink data packets in the PDU Set based on the header information of the GTP-U layer of the uplink data packets or the header information of the RTP layer of the uplink data packets.
- UPF transmits uplink data packets to AS in ascending order according to the sequence numbers of the uplink data packets in PDU Set.
- the UPF directly discards the data packet in the PDU set whose sequence number is greater than the sequence number of the uplink data packet.
- FIG7 shows a possible exemplary block diagram of a communication device involved in an embodiment of the present application, wherein the device 700 includes: a transceiver module 720 and a processing module 710, wherein the transceiver module 720 may include a receiving unit and a sending unit.
- the processing module 710 is used to control and manage the actions of the device 700.
- the transceiver module 720 is used to support the communication between the device 700 and other network entities.
- the device 700 may also include a storage unit, wherein the storage unit is used to store program codes and data of the device 700.
- each module in the device 700 may be implemented by software.
- the processing module 710 may be a processor or a controller, for example, a general-purpose central processing unit (CPU), a general-purpose processor, a digital signal processing (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic devices, transistor logic devices, hardware components or any combination thereof. It may implement or execute various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of the embodiments of the present application.
- the processor may also be a combination that implements a computing function, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and the like.
- the transceiver module 720 may be a communication interface, a transceiver or a transceiver circuit, etc., wherein the communication interface is a general term.
- the communication interface may include multiple interfaces, and the storage unit may be a memory.
- the processing module 710 in the apparatus 700 can support the apparatus 700 to execute the actions of the first device in the above method examples, for example, it can support the apparatus 700 to execute step 200 or step 210 in FIG. 2 .
- the transceiver module 720 can support the apparatus 700 to communicate with a terminal device.
- the processing module 710 calls the transceiver module 720 to execute:
- the protocol data unit set includes multiple uplink data packets, and the first device is a terminal device; or the protocol data unit set includes multiple downlink data packets, and the first device is a user plane network element;
- the processing module 710 is further configured to determine a plurality of data packets belonging to the protocol data unit set; and add a sequence number of each data packet in the plurality of data packets to a header of a corresponding data packet.
- the processing module 710 is further configured to determine, when the received second data packet includes a preset field and the received third data packet includes the preset field, whether a data packet received after the second data packet to the third data packet belongs to the protocol data unit set;
- the transceiver module 720 is used to receive first indication information from a session management network element, where the first indication information is used to indicate that if a data packet that fails to be transmitted is determined during the transmission of the protocol data unit set, then the data packet in the protocol data unit set whose sequence number is greater than the sequence number of the data packet that fails to be transmitted is discarded.
- the processing module 710 is further used to transmit multiple data packets in the protocol data unit set in ascending order according to their sequence numbers.
- the protocol data unit set includes a first part of data packets and a second part of data packets, the first part of data packets and the second part of data packets are not repeated, the priority of the first part of data packets is higher than the priority of the second part of data packets, the header of each data packet in the first part of data packets includes a first identifier, the header of each data packet in the second part of data packets includes a second identifier, and the ratio of the total number of the first part of data packets to the total number of data packets included in the protocol data unit set is greater than or equal to a preset ratio of a transmission success rate;
- the processing module 710 is also used to transmit the first part of the data packets through the first QoS flow according to the first identifier, and transmit the second part of the data packets through the second QoS flow according to the second identifier before determining that the transmission of the first data packet in the protocol data unit set fails.
- the transceiver module 720 is used to receive second indication information from a session management network element, where the second indication information indicates a preset ratio of the transmission success rate.
- the protocol data unit set includes multiple uplink data packets, and the first device is a terminal device; or the protocol data unit set includes multiple downlink data packets, and the first device is a user plane network element;
- the processing module 710 is also used to determine the first part of data packets and the second part of data packets according to the preset ratio of the transmission success rate, and add the first identifier to the header of each data packet in the first part of data packets, and add the second identifier to the header of each data packet in the second part of data packets.
- the first identifier is an identifier of the first QoS flow
- the second identifier is an identifier of the second QoS flow.
- the first device is a user plane network element, and the header of each data packet is a user plane general radio packet service tunneling protocol GTP-U layer header;
- the first device is a terminal device, and the header of each data packet is a packet data convergence protocol PDCP layer header or a service data adaptation protocol SDAP layer header.
- the processing module 710 is further used to continue transmitting data packets having sequence numbers smaller than the sequence number of the first data packet after discarding the data packets in the protocol data unit set having sequence numbers greater than the sequence number of the first data packet.
- the processing module 710 is further used to determine that, when it is determined that the transmission of the first data packet in the protocol data unit set fails, the number of retransmissions of the first data packet exceeds a retransmission number threshold; or, to determine that the transmission duration of the first data packet exceeds a transmission duration threshold.
- the device 700 may correspond to the first device in the aforementioned method embodiment, and the operations and/or functions of the various modules in the device 700 are respectively for implementing the corresponding steps of the method of the first device in the aforementioned method embodiment, and therefore the beneficial effects in the aforementioned method embodiment can also be achieved.
- the beneficial effects in the aforementioned method embodiment can also be achieved.
- they are not elaborated here.
- Fig. 8 shows a schematic structural diagram of a communication device 800 according to an embodiment of the present application.
- the device 800 includes: a processor 801 .
- the apparatus 800 is a first device or a chip in the first device, in a possible implementation, when the processor 801 is used to adjust Use the interface to perform the following actions:
- the device 800 can also be used to execute other steps and/or operations on the first device side in the previous embodiment, which are not described here for the sake of brevity.
- the processor 801 can call an interface to perform the above-mentioned transceiver action, wherein the called interface can be a logical interface or a physical interface, which is not limited.
- the physical interface can be implemented by a transceiver.
- the device 800 also includes a transceiver 803.
- the device 800 further includes a memory 802 , and the memory 802 may store program codes in the above method embodiment, so as to facilitate calling by the processor 801 .
- the device 800 includes a processor 801, a memory 802, and a transceiver 803, the processor 801, the memory 802, and the transceiver 803 communicate with each other through an internal connection path to transmit control and/or data signals.
- the processor 801, the memory 802, and the transceiver 803 can be implemented by a chip, and the processor 801, the memory 802, and the transceiver 803 can be implemented in the same chip, or they can be implemented in different chips, or any two of the functions can be combined and implemented in one chip.
- the memory 802 can store program code, and the processor 801 calls the program code stored in the memory 802 to implement the corresponding function of the device 800.
- the method disclosed in the above embodiment of the present application can be applied to a processor or implemented by a processor.
- the processor may be an integrated circuit chip with signal processing capabilities.
- each step of the above method embodiment can be completed by an integrated logic circuit of hardware in the processor or an instruction in the form of software.
- the above processor can be a general processor, a digital signal processor (digital signal processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a field programmable gate array (field programmable gate array, FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, and can also be a system chip (system on chip, SoC), a central processing unit (central processor unit, CPU), a network processor (network processor, NP), a digital signal processing circuit (digital signal processor, DSP), a microcontroller (micro controller unit, MCU), a programmable logic device (programmable logic device, PLD) or other integrated chips.
- SoC system on chip
- SoC system on chip
- CPU central processing unit
- CPU central processor unit, CPU
- network processor network processor
- NP digital signal processing circuit
- microcontroller micro controller unit, MCU
- programmable logic device programmable logic device, PLD
- the general processor may be a microprocessor or the processor may be any conventional processor, etc.
- the steps of the method disclosed in the embodiment of the present application may be directly embodied as being executed by a hardware decoding processor, or may be executed by a combination of hardware and software modules in the decoding processor.
- the software module may be located in a mature storage medium in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory, or an electrically erasable programmable memory, a register, etc.
- the storage medium is located in a memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.
- the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories.
- the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory.
- the volatile memory can be a random access memory (RAM), which is used as an external cache.
- RAM random access memory
- SRAM static RAM
- DRAM dynamic RAM
- SDRAM synchronous DRAM
- DDR SDRAM double data rate SDRAM
- ESDRAM enhanced SDRAM
- SLDRAM synchlink DRAM
- DR RAM direct rambus RAM
- the size of the sequence number of each process does not mean the order of execution, and the execution order of each process should be determined by its function and internal logic.
- the various digital numbers or sequence numbers involved in the above-mentioned processes are only for the convenience of description and should not constitute any limitation on the implementation process of the embodiments of the present application.
- a and/or B can mean: A exists alone, A and B exist at the same time, and B exists alone.
- the character “/” generally indicates that the previous and next associated objects are in an “or” relationship.
- the above is an example of three elements, A, B and C, to illustrate the optional items of the project.
- the project includes at least one of the following: A, B, ..., and X"
- the items that can be applied to the project can also be obtained according to the above rules.
- the disclosed systems, devices and methods can be implemented in other ways.
- the device embodiments described above are only schematic.
- the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed.
- Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.
- the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
- each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.
- the computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the various embodiments of the present application.
- the aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.
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Abstract
一种协议数据单元集合传输方法及装置,该方法包括:在第一设备向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,第一设备确定协议数据单元集合中的第一数据包传输失败,则丢弃协议数据单元集合中序号大于第一数据包的序号的数据包。采用上述方法,可以避免无意义的资源消耗对第一设备侧传输带来的资源浪费与负担,实现保障协议数据单元集合的高效传输。
Description
相关申请的交叉引用
本申请要求在2022年09月30日提交中国专利局、申请号为202211216987.1、申请名称为“一种协议数据单元集合传输方法及装置”的中国专利申请的优先权,其全部内容通过引用结合在本申请中。
本申请实施例涉及无线通信领域,尤其涉及一种协议数据单元集合传输方法及装置。
当前,针对实时媒体业务,如当前兴起的虚拟现实(virtual reality,VR)、增强现实(augmented reality,AR)、混合现实(mixed reality,MR)以及云游戏等业务,对端到端时延有着极为苛刻的要求,且上层媒体业务在进行编码、传输过程中对应的数据处理粒度不再是以数据包的粒度来进行。比如,在媒体层进行编码时,往往以媒体帧、分片等粒度进行处理,即媒体帧、分片等可以独立地进行编码处理,同时接收侧也会以媒体帧、分片等粒度进行解码与显示处理。而媒体帧、分片等往往会包含多个IP数据包(由于IP数据包大小的限制)。
基于此,标准上定义协议数据单元集合(Protocol Data Unit Set,PDU Set),作为媒体业务层能够进行独立处理的基本单元,一个PDU Set可以包括多个PDU数据包(简称数据包)。当前标准上提出了PDU Set粒度的服务质量(quantityofserver,QoS)处理机制,即会给出PDU Set粒度的丢失率以及时延要求,通过识别不同数据包与PDU Set之间的关系,将PDU Set包括的数据包作为一个整体来进行调度、处理与传输,保障用户的业务体验。
但是,在PDUSet的传输过程中,PDUSet内的某个或某些数据包发生了丢失或者损坏,则整个PDU Set可能会难以正确解码或显示,因此需要针对此场景提供相应的PDU Set处理机制。
发明内容
本申请提供一种协议数据单元集合传输方法及装置,用以实现保障协议数据单元集合的高效传输。
第一方面,本申请提供一种协议数据单元集合传输方法,该方法包括:
在第一设备向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,所述第一设备确定所述协议数据单元集合中的第一数据包传输失败,所述第一设备丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包。
采用上述方法,第一设备在传输协议单元数据过程中发现某数据包传输失败时,将会主动丢弃后续序号大于该数据包的序号的数据包的传输,从而避免无意义的资源消耗对第一设备侧传输带来的资源浪费与负担,可以实现保障协议数据单元集合的高效传输。
其中,数据包的序号又可以称为数据包的序列号,该序号可以用于表示数据包在服务器侧的发送顺序,序号大的数据包会在序号小的数据包之后发出。
在一种可能的设计中,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;所述第一设备确定属于所述协议数据单元集合的多个数据包,所述第一设备将所述多个数据包中每个数据包的序号添加至对应数据包的头部。
采用上述设计,终端设备可以确定协议数据单元集合包括多个上行数据包的序号并添加至数据包的头部,用户面网元可以确定协议数据单元集合包括多个下行数据包的序号并添加至数据包的头部。通过获得数据包的序号可以进一步实现根据数据包的序号确定数据包的先后顺序,从而确定数据包的优先级,其中,序号越小的数据包的优先级越高。
在一种可能的设计中,在所述第一设备确定属于所述协议数据单元集合的多个数据包时,可以采用但不限于如下方式:
方式1:在接收到的第二数据包包括预设字段且接收到的第三数据包包括所述预设字段时,所述第一设备确定从所述第二数据包之后接收到的一个数据包至所述第三数据包属于所述协议数据单元集合;
在终端设备侧,当终端设备确定协议数据单元集合中包括的数据包时,一般不会出现数据包乱序。
可选地,在用户面网元侧,为了避免数据包乱序的情况,用户面网元还可以根据第二数据包的序号确定协议数据单元集合中第一个数据包的序号,则根据第三数据包的序号确定协议数据单元集合中最后一个数据包的序号。进一步地,用户面网元可以根据第三数据包的序号以及其他已到达数据包的序号,确定协议数据单元集合中的数据包是否已经全部到达,即序号大于第二数据包的序号,且小于或等于第三数据包的序号的数据包是否已经全部到达。如果是,则用户面网元确定协议数据单元集合中的数据包已全部到达;如果不是,则用户面网元进一步确定哪个或哪些数据包仍未到达,等待上述未到达的数据包到达第一设备。
方式2:所述第一设备确定具有相同时间戳的数据包属于同一个协议数据单元集合。
在一种可能的设计中,所述第一设备从会话管理网元接收第一指示信息,所述第一指示信息用于指示在传输所述协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包,或者可以理解为丢弃所属协议数据单元集合中在传输失败的数据包之后的数据包。
采用上述设计,第一设备可以从会话管理网元获得第一指示信息,根据第一指示信息在传输所述协议数据单元集合的过程中确定出现传输失败的数据包,则丢弃该协议数据单元集中序号大于该传输失败的数据包的序号的数据包,从而可以避免无意义的资源消耗对第一设备侧传输带来的资源浪费与负担,实现保障协议数据单元集合的高效传输。
在一种可能的设计中,所述第一设备根据所述协议数据单元集合中多个数据包的序号从小到大的顺序进行传输。
示例性地,第一设备根据协议数据单元集合中多个数据包的序号从小到大的顺序进行传输,也即根据协议数据单元集合中多个数据包的先后顺序或优先级顺序进行传输。
采用上述设计,第一设备可以优先传输序号较小的数据包,即保证序号较小或该协议数据单元集合内靠前的数据包传输成功,从而第二设备可以根据序号较小的数据包进行解码,可以实现保障协议数据单元集合的高效传输。
在一种可能的设计中,所述协议数据单元集合包括第一部分数据包和第二部分数据包,所述第一部分数据包与所述第二部分数据包不重复,所述第一部分数据包的优先级高于所述第二部分数据包的优先级,所述第一部分数据包中的每个数据包的头部包括第一标识,所述第二部分数据包中的每个数据包的头部包括第二标识,所述第一部分数据包的总数与所述协议数据单元集合包括的数据包的总数的比值大于或等于传输成功率的预设比值;可以理解为第一部分数据包的序号小于第二部分数据包的序号,或者第一部分数据包处于该协议数据单元集合内的靠前位置,而第二部分数据包位于该协议数据单元集合的后面位置。在所述第一设备确定所述协议数据单元集合中的第一数据包传输失败之前,所述第一设备根据在所述第一标识将所述第一部分数据包通过第一QoS流传输,根据在所述第二标识将所述第二部分数据包通过第二QoS流传输。
采用上述设计,第一设备可以将协议数据单元集合包括的两个部分的数据包,通过不同的QoS流进行传输,由于第一部分数据包的优先级高于第二部分数据包的优先级,因此,可以通过调整第一QoS流的配置参数优先保证第一部分数据包传输成功,进而可以实现保障协议数据单元集合的高效传输,提升网络容量的同时保障用户的业务体验。
在一种可能的设计中,所述第一设备从会话管理网元接收第二指示信息,所述第二指示信息指示所述传输成功率的预设比值。
在一种可能的设计中,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;
所述第一设备根据所述传输成功率的预设比值确定所述第一部分数据包和所述第二部分数据包,并在所述第一部分数据包中的每个数据包的头部添加所述第一标识,在所述第二部分数据包中的每个数据包的头部添加所述第二标识。
此外,在所述协议数据单元集合包括多个上行数据包,所述第一设备为接入网设备时,终端设备根
据所述传输成功率的预设比值确定所述第一部分数据包和所述第二部分数据包,并在所述第一部分数据包中的每个数据包的头部添加所述第一标识。在所述第二部分数据包中的每个数据包的头部添加所述第二标识或者所述协议数据单元集合包括多个下行数据包,所述第一设备为接入网设备时,用户面网元根据所述传输成功率的预设比值确定所述第一部分数据包和所述第二部分数据包,并在所述第一部分数据包中的每个数据包的头部添加所述第一标识。
采用上述设计,终端设备或用户面网元根据传输成功率的预设比值确定第一部分数据包和第二部分数据包,并通过为第一部分数据包添加第一标识,以及为第二部分数据包添加第二标识,实现区分第一部分数据包和第二部分数据包,从而确保后续的差异化数据包传输处理。
在一种可能的设计中,所述第一标识为所述第一QoS流的标识,所述第二标识为所述第二QoS流的标识。
可以理解的是,在终端设备为第一部分数据包中的每个数据包的头部添加第一标识,以及为第二部分数据包中的每个数据包的头部添加第二标识时,第一标识还可以为第一优先级的标识,第二标识还可以为第二优先级的标识,其中,第一优先级高于第二优先级。第一设备可以根据第一优先级的标识和第二优先级的标识,保证具有第一优先级的标识的数据包优先传输。
在一种可能的设计中,若所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元,每个数据包的头部为用户面通用无线分组业务隧道协议GTP-U层头部;若所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备,每个数据包的头部为分组数据汇聚协议PDCP层头部或者服务数据适配协议SDAP层头部。
在一种可能的设计中,在丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包之后,所述第一设备继续传输序号小于所述第一数据包的序号的数据包。
采用上述设计,虽然已丢弃序号大于第一数据包的序号的数据包,但是对于序号小于第一数据包的序号的数据包,第一设备还需要进行保证其传输。
在一种可能的设计中,在所述第一设备确定所述协议数据单元集合中的第一数据包传输失败时,所述第一设备确定所述第一数据包的重传次数超过重传次数阈值;或者,所述第一设备确定所述第一数据包的传输时长超过传输时长阈值。
在一种可能的设计中,所述协议数据单元集合包括多个上行数据包;所述第一设备为终端设备,所述第二设备为接入网设备;或者,所述第一设备为接入网设备,所述第二设备为用户面网元;或者,所述第一设备为用户面网元,所述第二设备为数据网络。
在一种可能的设计中,所述协议数据单元集合包括多个下行数据包;所述第一设备为用户面网元,所述第二设备为接入网设备;或者,所述第一设备为接入网设备,所述第二设备为终端设备。
第二方面,本申请提供一种协议数据单元集合传输方法,该方法包括:
会话管理网元从策略控制网元接收第一指示信息,所述第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包;所述会话管理网元向第一设备发送所述第一指示信息。
采用上述设计,会话管理网元可以接收来自于策略控制网元的第一指示信息,并通知给第一设备,以实现第一设备根据第一指示信息,在传输协议数据单元集合的过程中确定传输失败的数据包时,丢弃所述协议数据单元集中序号大于该传输失败的数据包的序号的数据包。
在一种可能的设计中,所述会话管理网元从所述策略控制网元接收第二指示信息,所述第二指示信息用于指示传输成功率的预设比值,所述传输成功率的预设比值为所述协议数据单元集合中在出现传输失败的数据包之前需要传输成功的数据包总数与所述协议数据单元集合包括的数据包总数的最小比值;所述会话管理网元向所述第一设备发送所述第二指示信息。
第三方面,本申请提供一种协议数据单元集合传输方法,该方法包括:
策略控制网元从应用功能网元接收第一指示信息,所述第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包;所述策略控制网元向会话管理网元发送所述第一指示信息。
采用上述设计,策略控制网元可以接收来自于应用功能网元的第一指示信息,并通知给会话管理网元。
在一种可能的设计中,所述策略控制网元从所述应用功能网元接收第二指示信息,所述第二指示信
息用于指示传输成功率的预设比值,所述协议数据单元集合中在出现传输失败的数据包之前需要传输成功的数据包总数与所述协议数据单元集合包括的数据包总数的最小比值;
所述策略控制网元向所述会话管理网元发送所述第二指示信息。
此外,在一种可能的设计中,当第一设备为接入网设备时,终端设备也可以向第一设备发送第一指示信息。
在一种可能的设计中,第二指示信息也可以通过预配置方式预配置到终端设备或用户面网元。
第四方面,本申请还提供一种装置。该装置可以执行上述方法设计。该装置可以是能够执行上述方法对应的功能的芯片或电路,或者是包括该芯片或电路的设备。
在一种可能的实现方式中,该装置包括:存储器,用于存储计算机可执行程序代码;以及处理器,处理器与存储器耦合。其中存储器所存储的程序代码包括指令,当处理器执行所述指令时,使该装置或者安装有该装置的设备执行上述任意一种可能的设计中的方法。
其中,该装置还可以包括通信接口,该通信接口可以是收发器,或者,如果该装置为芯片或电路,则通信接口可以是该芯片的输入/输出接口,例如输入/输出管脚等。
在一种可能的设计中,该装置包括相应的功能单元,分别用于实现以上方法中的步骤。功能可以通过硬件实现,也可以通过硬件执行相应的软件实现。硬件或软件包括一个或多个与上述功能相对应的单元。
第五方面,本申请提供一种计算机可读存储介质,所述计算机可读存储介质存储有计算机程序,当所述计算机程序在装置上运行时,执行上述任意一种可能的设计中的方法。
第六方面,本申请提供一种计算机程序产品,所述计算机程序产品包括计算机程序,当所述计算机程序在装置上运行时,执行上述任意一种可能的设计中的方法。
图1为本申请应用的移动通信***的架构示意图;
图2为本申请提供的一种协议数据单元集合传输方法的概述流程图;
图3为本申请提供的在协议数据单元集合包括下行数据包时协议数据单元集合的传输方法的示意图之一;
图4为本申请提供的在协议数据单元集合包括上行数据包时协议数据单元集合的传输方法的示意图之一;
图5为本申请提供的在协议数据单元集合包括下行数据包时协议数据单元集合的传输方法的示意图之二;
图6为本申请提供的在协议数据单元集合包括下行数据包时协议数据单元集合的传输方法的示意图之二;
图7为本申请提供的一种通信装置的结构示意图之一;
图8为本申请提供的一种通信装置的结构示意图之二。
下面将结合本申请实施例中的附图,对本申请实施例中的技术方案进行清楚、完整地描述。显然,所描述的实施例仅仅是本申请一部分实施例,而不是全部的实施例。本申请的说明书和权利要求书及上述附图中的术语“第一”、第二”以及相应术语标号等是用于区别类似的对象,而不必用于描述特定的顺序或先后次序。应该理解这样使用的术语在适当情况下可以互换,这仅仅是描述本申请的实施例中对相同属性的对象在描述时所采用的区分方式。此外,术语“包括”和“具有”以及他们的任何变形,意图在于覆盖不排他的包含,以便包含一系列单元的过程、方法、***、产品或设备不必限于那些单元,而是可包括没有清楚地列出的或对于这些过程、方法、产品或设备固有的其它单元。
在本申请的描述中,除非另有说明,“/”表示或的意思,例如,A/B可以表示A或B;本申请中的“和/或”仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。另外,在本申请的描述中,“至少一项”是指一项或者多项,“多项”是指两项或两项以上。“以下至少一项(个)”或其类似表达,是指的这些项中的任意组
合,包括单项(个)或复数项(个)的任意组合。例如,a,b,或c中的至少一项(个),可以表示:a,b,c,a-b,a-c,b-c,或a-b-c,其中a,b,c可以是单个,也可以是多个。
如图1所示,第三代合作伙伴计划(3rd generation partnership project,3GPP)标准制定的5G的通信***。该通信***包括终端设备(例如,用户设备(user equipment,UE)),接入网设备(access network,AN)(例如,无线接入设备(radio access network,RAN)),核心网(core network,CN)。数据网络(data network,DN)在逻辑上,核心网的网元它们可以分为用户面和控制面两部分,控制面负责移动网络的管理,用户面负责业务数据的传输。
其中,终端设备是移动用户与网络交互的入口,能够提供基本的计算能力,存储能力,向用户显示业务窗口,接收用户操作输入。下一代终端设备(NextGen UE)可以采用新空口技术,与接入网设备建立信号连接,数据连接,从而传输控制信号和业务数据到移动网络。终端设备可以包括各种具有无线通信功能的手持设备、车载设备、可穿戴设备、计算设备或连接到无线调制解调器的其它处理设备,以及各种形式的终端,移动台(mobile station,MS),终端(terminal),软终端等等,例如水表、电表、传感器等。
接入网设备:部署在靠近终端设备的位置,为特定区域的授权用户提供入网功能,并能够根据用户的级别,业务的需求等确定不同质量的传输隧道来传输用户数据。接入网设备能够管理自身的资源,合理利用,按需为终端设备提供接入服务,并负责把控制信号和用户数据在终端设备和核心网之间转发。
核心网:负责维护移动网络的签约数据,管理移动网络的网元,为终端设备提供会话管理,移动性管理,策略管理,安全认证等功能。在终端设备附着的时候,为终端设备提供入网认证;在终端设备有业务请求时,为终端设备分配网络资源;在终端设备移动的时候,为终端设备更新网络资源;在终端设备空闲的时候,为终端设备提供快恢复机制;在终端设备去附着的时候,为终端设备释放网络资源;在终端设备有业务数据时,为终端设备提供数据路由功能,如转发上行数据到数据网络;或者从数据网络接收终端设备的下行数据,转发到接入网设备,从而由接入网设备发送给终端设备。
数据网络:为用户提供业务服务的数据网络,一般客户端位于终端设备,服务端位于数据网络。数据网络可以是私有网络,如局域网,也可以是不受运营商管控的外部网络,例如互联网(Internet),还可以是运营商共同部署的专有网络,例如提供IP多媒体网络子***(IP multimedia core network subsystem,IMS)服务的网络。
其中,核心网用户面包括用户面功能(user plane function,UPF);核心网控制面包括接入和移动性管理功能(access and mobility management function,AMF),会话管理功能(session management function,SMF),网络开放功能(network exposure function,NEF),网络功能仓储功能(NF repository function,NRF),统一数据管理(unified data management,UDM),策略控制功能(policy control function,PCF),应用功能(application function,AF)。
核心网控制面采用服务化架构,控制面网元之间的交互采用服务调用的方式,来替换传统架构中的点对点通信方式。在服务化架构中,控制面网元会向其他控制面网元开放服务,供其他控制面网元调用;在点对点通信中,控制面网元之间通信接口会存储一套特定的消息,只能由接口两端的控制面网元在通信时使用。
以下对核心网中的功能实体的功能进行简单介绍:
1、会话管理网元:主要用于会话管理、终端设备的IP地址分配和管理、选择可管理用户设备平面功能、策略控制、或收费功能接口的终结点以及下行数据通知等。在5G通信中,会话管理网元可以是SMF网元,在未来通信如6G通信中,会话管理功能网元仍可以是SMF网元,或者有其它名称,本申请对此不作限定。Nsmf是SMF提供的基于服务的接口,SMF可以通过Nsmf与其他的网络功能通信。
2、接入管理网元:主要用于移动性管理和接入管理等,例如可以是4G通信网络中的移动性管理实体(mobility management entity,MME)功能或者5G网络中的AMF网元。在未来通信如6G通信中,接入管理网元仍可以是AMF网元,或者有其它名称,本申请对此不作限定。Namf是AMF提供的基于服务的接口,AMF可以通过Namf与其他的网络功能通信。
3、网络开放网元:用于安全地向外部开放由3GPP网络功能提供的业务和能力等。在5G通信中,网络开放网元可以是NEF网元,在未来通信如6G通信中,网络开放功能网元仍可以是NEF网元,或者有其它名称,本申请对此不作限定。其中Nnef是NEF提供的基于服务的接口,NEF可以通过Nnef与其他的网络功能通信。
4、网络存储网元:用于提供服务注册、发现和授权,并维护可用的网络功能(network function,NF)实例信息,可以实现网络功能和服务的按需配置以及NF之间的互连。在5G通信中,网络存储网元可以是NRF网元,在未来通信如6G通信中,网络存储功能网元仍可以是NRF网元,或者有其它名称,本申请对此不作限定。Nnrf是NRF提供的基于服务的接口,NRF可以通过Nnrf与其他的网络功能通信。
5、策略控制网元:用于指导网络行为的统一策略框架,为控制平面功能网元(例如AMF,SMF等)提供策略规则信息等。在5G通信中,策略控制网元可以是PCF网元,在未来通信如6G通信中,策略控制网元仍可以是PCF网元,或者有其它名称,本申请对此不作限定。其中Npcf是PCF提供的基于服务的接口,PCF可以通过Npcf与其他的网络功能通信。
6、数据管理网元:用于处理用户标识、签约、接入鉴权、注册、或移动性管理等。在5G通信中,数据管理网元可以是UDM网元,在未来通信如6G通信中,数据管理网元仍可以是UDM网元,或者有其它名称,本申请对此不作限定。其中Nudm是UDM提供的基于服务的接口,UDM可以通过Nudm与其他的网络功能通信。
7、应用网元:用于进行应用影响的数据路由,接入网络开放功能,或与策略框架交互进行策略控制等。在5G通信中,应用网元可以是AF网元,在未来通信如6G通信中,应用网元仍可以是AF网元,或者有其它名称,本申请对此不作限定。Naf是AF提供的基于服务的接口,AF可以通过Naf与其他的网络功能通信。
8、用户面网元:用于分组路由和转发、或用户面数据的服务质量(quality of service,QoS)处理等。在5G通信中,用户面网元可以是用户面功能(user plane function,UPF)网元,在未来通信如6G通信中,用户面网元仍可以是UPF网元,或者有其它名称,本申请对此不作限定。
可以理解的是,核心网还可以包括其他网元,本申请对此不作限定。
为便于理解本申请实施例,对本申请实施例中涉及的几个基本概念做简单说明。
1、QoS流(QoSflow):当UE有业务通信需求时,UE会进行数据连接会话(比如PDU会话或其它形式的会话)建立,而在数据连接会话中具体承载业务流的是相应的QoS流。具体地,UE通过PDU会话建立获取IP地址从而与外部业务服务器进行交互,实现业务通信,而5GS基于业务流描述信息,例如,业务流模板(servicedata flow template,SDF template),将相应业务映射到不同的QoS流中,执行相应的QoS处理。
QoS流标识(QoSflowidentifier),用于标识一个PDU会话内不同QoS流的唯一标识。
现有的QoS机制以数据包的粒度进行业务保证,如当前QoS参数中的数据包错误率(packet error rate,PER)以及数据包时延预算(packet delay budget,PDB),业务数据将会被映射到相同的QoS流内进行传输,而相同的QoS流具有相同的QoS参数,对应相同QoS流的数据包将会根据对应相同的QoS参数逐个数据包进行同等地策略处理与传输。换而言之,相同QoS流内的所有数据包将会在传输过程中进行同等、无差别的处理。
2、用户面GPRS隧道协议(GPRS tunneling protocol-user plane,GTP-U)隧道:
示例性地,以5G通信***为例,在PDU会话建立过程中,RAN与UPF之间的连接会用到GTP-U隧道,即将来自/发往UE侧的数据添加到隧道中进行发送,该GTP-U隧道是PDU会话粒度的,即每个PDU会话都会建立一个RAN到UPF之间的GTP-U隧道。
3、PDU数据包
是指在网络端到端传输过程中的基本单元,可以是指IP数据包(packet),也可以是TCP分段(segment)或者UDP报文(datagram)。在本申请中,以PDU数据包是IP数据包为例进行说明。
一个PDU Set可以包括多个PDU数据包,例如,一个PDU set包括多个IP数据包。
在PDUSet的传输过程中,PDUSet内的某个或某些数据包发生了丢失或者损坏,则整个PDU Set可能会难以正确解码或显示,具体可以包括以下几种场景:
场景1,当PDU Set内有一个PDU数据包发生丢失或损坏时,接收端无法对接收到的剩余PDU Set内的其他PDU数据包进行正确地解码与显示。
场景2,为了提升传输的可靠性,发送端的业务层或者应用层在发送PDU Set之前会对该PDU Set进行前向纠错编码(forwarderrorcorrection,FEC)处理,即通过添加额外的冗余数据包缓解在传输过程中丢包对业务体验带来的影响。
针对场景2,在传输该PDU Set时,保证PDU Set内一定数目的数据包能够正确传输即可,可以允许存在一定数目的数据包传输失败。
场景3,接收端在接收到PDU Set内的前n-1个数据包且第n个数据包传输失败后,接收端的编解码器根据前n-1个数据包恢复前n-1个数据包对应的业务内容,即当接收端接收到该PDU Set内的顺序较为靠前的一部分数据包后即可恢复PDU Set对应的内容,n为正整数。换言之,PDU Set内首个丢包在PDU Set内的位置会对接收端是否能够解码PDU Set对应的内容产生影响,在PDU Set内顺序较为靠前的数据包具有更高的传输优先级。以媒体业务为例,该PDU Set可以是一个媒体帧,对应业务内容是媒体播放过程中一帧图画,当第n个数据包丢失的时候,接收端可以根据前n-1个数据包回复前n-1个数据包对应的图画帧的一部分内容。
基于上述场景,本申请提出了一种协议数据单元集合传输方法,用以实现保障协议数据单元集合的高效传输。
需要说明的是,在下述方法中,第一设备向第二设备传输协议数据单元集合。
一种可能的实现方式中,协议数据单元集合可以包括多个上行数据包,则第一设备可以为终端设备,第二设备可以为接入网设备;或者,第一设备可以为接入网设备,第二设备可以为用户面网元;或者,第一设备可以为用户面网元,第二设备可以为数据网络或应用服务器。
另一种可能的实现方式中,协议数据单元集合可以包括多个下行数据包,则第一设备可以为用户面网元,第二设备可以为接入网设备;或者,第一设备可以为接入网设备,第二设备可以为终端设备。
协议数据单元集合为在终端上使用的业务的协议数据单元集合。在终端上使用的业务可以为媒体业务,例如当前兴起的虚拟现实(virtual reality,VR)、增强现实(augmented reality,AR)、混合现实(mixed reality,MR)或云游戏等业务。
如图2所示,该方法包括:
步骤200:在第一设备向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,第一设备确定协议数据单元集合中的第一数据包传输失败。
其中,第一数据包为协议数据单元集合中首个传输失败的数据包。
示例性地,在XR业务启动后,终端设备与应用服务器之间通过5G网络进行数据传输,其中,第一设备向第二设备传输在终端设备上使用的业务的协议数据单元集合,第一设备确定协议数据单元集合中的第一数据包传输失败,例如,在第一设备确定第一数据包的重传次数超过重传次数阈值时,第一设备确定协议数据单元集合中的第一数据包传输失败;或者,在第一设备确定第一数据包的传输时长超过传输时长阈值时,第一设备确定协议数据单元集合中的第一数据包传输失败。
此外,当协议数据单元集合在接入网设备与终端设备之间传输时,确定第一数据包传输失败包括:确定该数据包传输所的时延超过该数据包的数据包时延预算。具体地,无线链路控制(radio link control,RLC)层未来得及将该数据包发送至媒体访问控制(media access control,MAC)层进行传输,即在超过PDB时间后,数据包仍在RLC层缓存内,则确定该数据包超过了PDB还未被调度传输,也就是确定该数据包丢失或传输失败。
另外,当接入网设备与终端设备之间存在反馈机制时,接入网设备可以根据终端设备的反馈确定该数据包是否传输成功。比如,数据包在通过MAC层传输时,MAC层可能会将上层的数据包进行拆分与重组,从而保障适合信道传输。MAC层保存该数据包与MAC层传输数据块之间的映射关系,MAC层会根据混合自动重传请求(hybrid automatic repeat request,HARQ)的反馈情况,确定数据包是否传输成功。
此外,第一设备还可以通过其他方式确定协议数据单元集合中的第一数据包传输失败,本申请对此不作限定。
步骤210:第一设备丢弃协议数据单元集合中序号大于第一数据包的序号的数据包。
示例性地,第一设备可以获知每个数据包的序号,并在确定第一数据包传输失败之后,丢弃协议数据单元集合中序号大于第一数据包的序号的数据包。其中,数据包的序号可以表征数据包在协议数据单元中的先后顺序。
此外,在一种可能的实现方式中,第一设备还可以从会话管理网元接收第一指示信息,第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包时,丢弃协议数据单元集中序号大
于传输失败的数据包的序号的数据包。因此,第一设备可以根据第一指示信息,基于数据包的序号,在确定第一数据包传输失败之后,丢弃协议数据单元集合中序号大于第一数据包的序号的数据包。
示例性地,应用功能网元可以向策略控制网元发送第一指示信息,策略控制网元向会话管理网元发送策略控制和计费(policy control and charging,PCC)规则,PCC规则包括第一指示信息。
在一种可能的实现方式中,第一设备可以采用但不限于下述方式确定数据包的序号:
(1)若协议数据单元集合包括多个上行数据包,第一设备为终端设备。第一设备可以确定多个上行数据包的顺序。
例如,第一设备根据上行数据包的实时传输协议(Real-timeTransportProtocol,RTP)头部的序号(sequence number,SN)确定上行数据包的序号。进一步地,第一设备可以在上述多个上行数据包中每个上行数据包的头部,添加该上行数据包的序号。其中,每个上行数据包的头部为分组数据汇聚协议(packet data convergence protocol,PDCP)层头部或服务数据适配协议(service data adaptation protocol,SDAP)层头部。
(2)若协议数据单元集合包括多个下行数据包,第一设备为用户面网元。第一设备可以确定多个下行数据包的顺序。例如,第一设备根据下行数据包的RTP头部的分界字段“M”位或时间戳等区分不同的协议数据单元集合,并根据RTP头部的SN确定协议数据单元集合内部下行数据包的序号。进一步地,第一设备可以在上述多个下行数据包中每个下行数据包的头部,添加该下行数据包的序号。其中,每个下行数据包的头部为GTP-U层头部。
(3)若第一设备为接入网设备,接入网设备可以根据数据包的头部确定该数据包的序号。
由上述(1)或(2)可知,若协议数据单元集合包括多个上行数据包,接入网设备可以根据数据包的PDCP层或SDAP层头部确定该数据包的序号。若协议数据单元集合包括多个下行数据包,接入网设备可以根据数据包的GTP-U层或者RTP层头部确定该数据包的序号。
示例性地,第一设备还可以确定属于协议数据单元集合的多个数据包,具体可以采用但不限于以下方式:
方式1:在接收到的第二数据包包括预设字段且接收到的第三数据包包括相同的预设字段时,第一设备确定从第二数据包之后接收到的一个数据包至第三数据包属于协议数据单元集合。也就是说,相邻两个协议数据单元集合可以通过预设字段进行分隔。此外,需要说明的是,第二数据包之后接收到的数据包至第三数据包之前接收到的数据包均不包括该预设字段。
例如,第一设备接收数据包1,数据包1包括预设字段,在接收到数据包1之后,第一设备还接收到数据包2至数据包11,其中,数据包11也包括该预设字段,则数据包2至数据包11构成一个协议数据单元集合。其中,数据包2至数据包10不包括该预设字段。
示例性地,这里的预设字段可以为实时传输协议(Real-timeTransportProtocol,RTP)头部的“M”字段。例如,对于第二数据包和第三数据包中的“M”字段的取值为“1”,序号大于第二数据包的序号且小于第三数据包的序号的数据包中的“M”字段的取值为“0”。即“M”字段用于指示当前协议数据单元集合的边界。
此外,在数据包传输过程(特别是下行数据包传输过程)中,由于网络抖动等问题可能存在乱序情况,因此可能额外出现以下两种情况:
情况1:属于协议数据单元集合的数据包晚于第三数据包到达第一设备。这里的协议数据单元集合为包括第三数据包的协议数据单元集合。
例如,第一设备接收数据包1,数据包1包括预设字段,在接收到数据包1之后,第一设备还依次接收到数据包2、数据包3、数据包5、数据包6、数据包9、数据包4、数据包7、数据包10和数据包11,其中,数据包11包括该预设字段。在接收到数据包11之后,第一设备还接收到数据包8。
基于上述情况1可知,第三数据包可能不是该协议数据单元集合中最后一个接收到的数据包。
情况2:不属于协议数据单元集合的数据包早于第三数据包到达第一设备。这里的协议数据单元集合为包括第三数据包的协议数据单元集合。
例如,第一设备接收数据包1,数据包1包括预设字段,在接收到数据包1之后,第一设备还依次接收到数据包2、数据包3、数据包5、数据包6、数据包7、数据包4、数据包9、数据包10、数据包8、数据包15和数据包11,其中,数据包11包括该预设字段。在接收到数据包11之前,第一设备还接收到数据包15。
此外,上述情况1和情况2还可以相结合,即存在属于协议数据单元集合的数据包晚于第三数据包到达第一设备,且存在不属于协议数据单元集合的数据包早于第三数据包到达第一设备。
基于上述情况1和情况2,第一设备还可以根据RTP头部的SN以及M字段共同确定协议数据单元集合。示例性地,由于第二数据包包括M字段,则第一设备可以根据第二数据包的RTP头部的SN确定协议数据单元集合中第一个数据包的序号,即第二数据包的RTP头部的SN加1,由于第三数据包包括M字段,则根据第三数据包的RTP头部的SN确定协议数据单元集合中最后一个数据包的序号,即第三数据包的RTP头部的SN。因此,第一设备可以确定协议数据单元集合中第一个数据包的序号和最后一个数据包的序号,从而即使在数据包出现乱序的场景下,也能准确确定协议数据单元集合所包括的数据包。
因此,第一设备可以根据第三数据包的SN以及其他已到达数据包的SN,确定协议数据单元集合中的数据包是否已经全部到达。即序号大于第二数据包的SN,且小于或等于第三数据包的SN的数据包是否已经全部到达,或者在第二数据包后以及在第三数据包之前的所有数据包是否已经全部到达。如果是,则确定协议数据单元集合中的数据包已全部到达;如果不是,则进一步确定哪个或哪些数据包仍未到达,等待上述未到达的数据包到达第一设备。
对于上述情况1,第一设备接收数据包1,数据包1包括预设字段,在接收到数据包1之后,第一设备还依次接收到数据包2、数据包3、数据包5、数据包6、数据包9、数据包4、数据包7、数据包10和数据包11,其中,数据包11包括该预设字段。第一设备根据数据包1确定协议数据单元集合中第一个数据包的序号为2(1+1),根据数据包11的序号确定协议数据单元集合中最后一个数据包的序号为11,也即序号2至序号11的数据包为协议数据单元集合包括的数据包。进一步地,第一设备确定当前接收到的数据包不包括数据包8,因此,第一设备等待数据包8,在数据包8到达后,第一设备确定协议数据单元集合中的数据包全部到达。
对于上述情况2,第一设备接收数据包1,数据包1包括预设字段,在接收到数据包1之后,第一设备还依次接收到数据包2、数据包3、数据包5、数据包6、数据包7、数据包4、数据包9、数据包10、数据包8、数据包15和数据包11,其中,数据包11包括该预设字段。第一设备根据数据包1确定协议数据单元集合中第一个数据包的序号为2(1+1),根据数据包11的序号确定协议数据单元集合中最后一个数据包的序号为11,也即序号2至序号11的数据包为协议数据单元集合包括的数据包。进一步地,第一设备确定当前接收到的数据包已包括序号2至序号11的数据包,确定协议数据单元集合中的数据包全部到达,且第一设备不将数据包15作为协议数据单元集合中的一个数据包。
作为方式1的可选实现方式,在接收到的第二数据包包括预设字段且接收到的第三数据包包括相同的预设字段时,第一设备确定第二数据包至第三数据之前最后一个接收到的数据包属于协议数据单元集合。
作为方式1的可选实现方式,第一设备确定接收到的首个包括预设字段的数据包至包括相同的预设字段的数据包之间接收到的数据包属于同一个协议数据单元集合的数据包。
方式2:在接收到的第二数据包包括预设字段A且接收到的第三数据包包括预设字段B时,第一设备确定从第二数据包至第三数据包属于协议数据单元集合。也就是说,协议数据单元集合可以通过预设字段进行确定。其中,预设字段A又可称为首包字段,预设字段B又可称为尾包字段。
例如,第一设备接收数据包1,数据包1包括预设字段A,在接收到数据包1之后,第一设备还接收到数据包2至数据包11,其中,数据包11也包括预设字段B,则数据包1至数据包11构成一个协议数据单元集合。其中,数据包2至数据包10不包括预设字段A,也不包括预设字段B,即数据包2至数据包10对应的预设字段A和预设字段B全部置为0。
示例性地,这里的预设字段A可以为RTP头部扩展中的“S”字段,预设字段B可以为RTP头部扩展中的“E”字段。例如,第二数据包中的“S”字段的取值为“1”,第三数据包中的“E”字段的取值为“1”。序号大于第二数据包的序号且小于第三数据包的序号的数据包中的“E”字段的取值为“0”,且“S”字段的取值为“0”。
基于上述情况1和情况2,由于第二数据包包括预设字段A,则第一设备可以根据第二数据包的RTP头部的SN确定协议数据单元集合中第一个数据包的序号,即第二数据包的RTP头部的SN,由于第三数据包包括预设字段B,则根据第三数据包的RTP头部的SN确定协议数据单元集合中最后一个数据包的序号,即第三数据包的RTP头部的SN。因此,第一设备可以确定协议数据单元集合中第一个数
据包的序号和最后一个数据包的序号,从而即使在数据包出现乱序的场景下,也能准确确定协议数据单元集合所包括的数据包。
方式3:第一设备确定具有相同时间戳的数据包属于同一个协议数据单元集合。
例如,第一设备接收20个数据包,其中,第1个数据包至第12个数据包包括相同的时间戳1,第13个数据包至第20个数据包包括相同的时间戳2,则包括时间戳1的各个数据包构成一个协议数据单元集合,包括时间戳2的各个数据包构成另一个协议数据单元集合。
对于上行数据包,该时间戳可以由终端设备生成,对于下行数据包,该时间戳可以由应用服务器生成。示例性地,这里的时间戳可以为RTP头部中的“timestamp”字段,该时间戳可以表示该媒体帧或媒体分片生成或采集的时间。
此外,作为方式3的可选方式,第一设备确定多个数据包括相同的预设字段,则确定所述多个数据包属于同一协议数据单元集合。其中,预设字段可以是协议数据单元集合的标识,或指示多个数据包为同一协议数据单元集合的数据包的任意形式的取值。
可以理解的是,在第一设备丢弃序号大于第一数据包的序号的数据包之后,第一设备确定还存在序号小于第一数据包的序号的数据包未传输或未传输成功,则第一设备继续传输序号小于第一数据包的序号的数据包。即第一设备丢弃该协议数据单元集合中第一数据包之后的数据包,并继续传输第一数据包之前的数据包。
采用上述设计,当协议数据单元集合中有传输失败的数据包时,丢弃同一协议数据单元集合中未传输的且序号大于传输失败的数据包的序号的数据包,能够避免传输和接收后续数据包带来的资源开销。
此外,需要说明的是,在第一设备向第二设备传输协议数据单元集合的过程中,第一设备可以采用但不限于以下方式保障序号靠前的数据包的传输:
方式A;第一设备根据协议数据单元集合中多个数据包的序号从小到大的顺序进行传输。
示例性地,在协议数据单元集合传输期间,在资源允许的范围内,第一设备保障序号靠前的数据包的传输,或者将用于序号靠后的数据包传输的资源用于传输序号靠前的数据包。
其中,第一设备可以在传输该协议单元数据过程中,优先调度传输资源保证序号靠前的数据包的传输,在传输资源调度过程中,根据传输顺序进行逐包地调度与传输,而在顺序靠前数据包传输未成功之前,不会再次进行后续数据包的传输调度,从而确保传输资源能够用于保障序号靠前的数据包的成功传输。比如,第一设备同时为数据包#1,数据包#2,数据包#3配置相应的资源进行调度与传输,在数据包#2传输失败后,后续的传输资源优先给与数据包#2进行再次传输,直至该数据包#2传输成功后,再次进行后续数据包的传输调度。
方式B:第一设备将协议数据单元集合中的多个数据包通过两个QoS流分别进行传输,其中一个QoS流的优先级高于另一个QoS流的优先级,且优先级较高的QoS流承载的数据包的序号小于优先级较低的QoS流承载的数据包的序号。
示例性地,第一设备根据第一标识将第一部分数据包通过第一QoS流传输,根据第二标识将第二部分数据包通过第二QoS流传输。其中,协议数据单元集合包括第一部分数据包和第二部分数据包。第一部分数据包与第二部分数据包不重复。第一部分数据包的优先级高于第二部分数据包的优先级,第一部分数据包中的每个数据包的头部包括第一标识,第二部分数据包中的每个数据包的头部包括第二标识,第一部分数据包的总数与协议数据单元集合包括的数据包的总数的比值大于或等于传输成功率的预设比值。
其中,优先级较高的QoS流承载的数据包的序号小于优先级较低的QoS流承载的数据包的序号可以理解为通过第一QoS流承载的第一部分数据包的序号均小于通过第二QOS流承载的第二部分数据包的序号,或者,通过第一QoS流承载的第一部分数据包中数据包的最大序号小于通过第二QOS流承载的第二部分数据包中数据包的最小序号,或者通过第一QoS流承载该协议数据单元中靠前的第一部分数据,通过第二QoS流承载该协议数据单元中靠后的第二部分数据。
其中,该传输成功率的预设比值可以理解为一个协议数据单元中需要传输成功的数据包的最小数量与该协议数据单元包括的数据包总数的比值。需要传输成功的数据包为序号靠前的数据包,或者描述为,需要传输成功的数据包的序号均小于除需要传输成功的数据包之外的数据包的序号。又或者描述为,需要传输成功的数据包中的最大序号小于除需要传输成功的数据包之外的数据包的最小序号。需要传输成
功的数据包的最小数量可以根据实际传输需要或解码译码需求确定。
此外,在一种可能的实现方式中,第一设备从会话管理网元接收第二指示信息,第二指示信息指示传输成功率的预设比值。示例性地,应用功能网元可以向策略控制网元发送第二指示信息,策略控制网元向会话管理网元发送PCC规则,PCC规则包括第二指示信息。或者,在另一种可能的实现方式中,第一设备侧预配置的该传输成功率的预设比值。
需要说明的是,在方式B中,若协议数据单元集合包括多个上行数据包,第一设备为终端设备,或者协议数据单元集合包括多个下行数据包,第一设备为用户面网元,则第一设备还可以根据传输成功率的预设比值确定第一部分数据包和第二部分数据包,并在第一部分数据包中的每个数据包的头部添加第一标识,在第二部分数据包中的每个数据包的头部添加第二标识。示例性地,第一标识可以为第一QoS流的标识,第二标识可以为第二QoS流的标识。
其中,若协议数据单元集合包括多个下行数据包,第一设备为用户面网元,每个数据包的头部为GTP-U层头部;若协议数据单元集合包括多个上行数据包,第一设备为终端设备,每个数据包的头部为PDCP层或SDAP层头部。
此外,需要说明的是,若协议数据单元集合包括多个上行数据包,第一设备为接入网设备,第二设备为用户面网元,则终端设备还可以根据传输成功率的预设比值确定第一部分数据包和第二部分数据包,并在第一部分数据包中的每个数据包的头部添加第一标识,在第二部分数据包中的每个数据包的头部添加第二标识。
若协议数据单元集合包括多个下行数据包,第一设备为接入网设备,第二设备为终端设备,则用户面网元还可以根据传输成功率的预设比值确定第一部分数据包和第二部分数据包,并在第一部分数据包中的每个数据包的头部添加第一标识,在第二部分数据包中的每个数据包的头部添加第二标识。示例性地,第一标识可以为第一QoS流的标识,第二标识可以为第二QoS流的标识。
此外,若协议数据单元集合包括多个上行数据包,在终端设备为第一部分数据包中的每个数据包添加第一标识,以及为第二部分数据包中的每个数据包添加第二标识时,第一标识还可以为第一优先级的标识,第二标识还可以为第二优先级的标识,其中,第一优先级高于第二优先级。第一设备可以根据第一优先级的标识和第二优先级的标识,优先保证具有第一优先级的标识的数据包的传输。
采用上述设计,可以实现保障协议数据单元集合内序号靠前顺序的数据包的传输。
以下结合具体实施例对图3所示方法进行详细说明:
如图3所示,在终端设备使用的业务的数据流中的PDU Set包括多个下行数据包,且传输协议数据单元集合采用上述方式A传输时,来自应用服务器(applicationserver,AS)的下行数据包首先到达UPF侧,并通过N3接口发往RAN侧,随后通过Uu接口发往UE侧,具体流程如下:
S301:AF向PCF发送第一指示信息。
其中,第一指示信息用于指示在传输终端设备使用的业务的数据流中的PDU Set的过程中确定传输失败的数据包,则丢弃PDU Set中序号大于传输失败的数据包的序号的数据包。
另外,AF还提供业务流描述信息,用于表征该业务流的特征信息,例如,业务流描述信息包括IP五元组信息(源IP地址、目标IP地址、源端口号、目标端口号、传输协议)或三元组信息(目标IP地址、目标端口号、传输协议)、应用标识等。提供业务流描述信息以确保针对该业务流描述信息对应的目标业务流进行相应处理。
示例性地,AF通过能力开放接口向PCF发送第一指示信息。其中,若AF在可信域内,AF可以直接与PCF进行交互,即通过调用PCF的服务接口,如Npcf_PolicyAuthorization服务接口;若AF在非可信域,AF需要通过NEF与PCF交互,AF调用NEF的服务接口,如Nnef_AFSessionWithQoS服务接口,NEF调用PCF的服务接口。
S302:UE向AMF发送PDU会话建立请求。
当UE发起PDU会话建立或PDU会话修改流程时,UE向AMF发送PDU会话建立请求或PDU会话修改请求。此处仅以PDU会话建立过程为例进行说明。
具体地,UE通过NAS消息将PDU会话修改或PDU会话建立请求发往RAN侧,由RAN将该NAS消息发往AMF侧。
S303:AMF向SMF发送PDU会话建立请求。
可以理解的是,当UE发起PDU会话修改流程时,AMF向SMF发送来自UE侧的PDU会话修改请求。
S304:SMF向PCF发送会话管理策略关联建立请求消息。会话管理策略关联建立请求消息用于请求PCC规则。
S305:PCF向SMF发送会话管理策略关联建立响应消息。会话管理策略关联建立响应消息包括PCC规则,其中,PCC规则包括第一指示信息。或者,会话管理策略关联建立响应消息包括PCC规则或第一指示信息。
需要说明的是,若是UE发起的PDU会话建立流程,SMF发起会话管理策略关联建立流程。若是UE发起的PDU会话修改流程,SMF发起会话管理策略关联修改流程。此外,若S302未执行,则PCF可以主动发起会话管理策略关联修改流程,并向SMF发送PCC规则。
S306:SMF向RAN发送第一指示信息。
示例性地,SMF通过AMF向RAN发送第一指示信息。
另外,SMF根据来自PCF侧的PCC规则生成对应QoS描述信息(QoS profile),SMF还会向RAN侧发送QoS Profile,用于明确对于指定QoS流的相应QoS处理。
此外,SMF还向RAN发送第一通知消息,该第一通知消息还用于指示RAN根据下行数据包的GTP-U层的头部信息确定哪些下行数据包属于同一个PDU Set,以及下行数据包在PDU Set内的顺序。
作为一种可选的替代方案,若SMF未向RAN发送第一指示信息,UE还可以向RAN发送第一指示信息,此时前面的步骤均为可选的流程。
S307:SMF向UPF发送第一指示信息。
示例性地,SMF根据来自PCF侧的PCC规则向UPF发送第一指示信息。示例性地,SMF向UPF发送N4规则,N4规则可以通过N4会话建立或修改流程携带给UPF,该N4规则可以包括第一指示信息。
此外,N4规则还可以包括PDU Set的识别以及标记方案,即如何识别哪些下行数据包属于同一个PDU Set以及PDU Set内的下行数据包的顺序,并在下行数据包的GTP-U层的头部进行标识的方法。
可以理解的是,后续PDU会话建立流程,可以参考TS 23.502第4.3.2.1章节,此处不再赘述。
当下行媒体业务开始,也即终端设备的下行业务数据流开始传输,比如对于XR业务,应用服务器接收到来自终端设备的上行数据后会相应生成对应的下行媒体数据,将下行媒体数据通过5G网络发往终端设备侧,执行下述S308至S313。
S308:UPF从AS接收终端设备的下行业务数据流中的下行数据包。即UPF接收来自AS发往UE的下行数据包。
S309:UPF根据N4规则确定哪些下行数据包属于同一个PDU Set以及PDU Set内各数据包的顺序。UPF确定PDU Set内各个下行数据包的顺序包括确定各个下行数据包的序号,即PDU序号(PDU SequenceNumber,PDU SN))。
示例性地,若下行媒体业务通过RTP传输,UPF可以根据RTP的头部信息确定以下内容:
(1)通过下行数据包的RTP的头部的“M”字段确定PDU Set的分界点,或者通过RTP头部的时间戳确定具有相同时间戳的PDU数据包同属于一个PDU Set,或者通过RTP头部扩展字段中的“S”字段与“E”字段确定PDU Set的初始数据包与结束数据包;
(2)通过下行数据包的RTP头部的SN确定PDU Set内下行数据包的顺序,即确定每个下行数据包的序号。
S310:在完成PDU Set以及PDU Set内下行数据包的顺序的识别之后,UPF将每个下行数据包的序号添加到该下行数据包的GTP-U层头部。
可选地,UPF还可以将数据包在PDU Set内的顺序映射为相应的传输优先级添加到下行数据包的GTP-U层头部。
另外,UPF还可以将下行数据包所属的PDU Set标识信息添加到GTP-U层头部。
S311:UPF根据PDU Set内下行数据包的序号从小到大的顺序向RAN传输下行数据包。
若确定某个PDU set内下行数据包传输失败,则UPF直接丢弃该PDU set内序号大于该下行数据包的序号的数据包。
该步骤为可选步骤。
S312:RAN根据下行数据包的GTP-U层的头部信息确定哪些下行数据包属于同一个PDU Set,以及下行数据包在PDU Set内的顺序。
S313:RAN根据下行数据包的序号从小到大的顺序向UE传输下行数据包。
若确定某个PDU set内下行数据包传输失败,则RAN直接丢弃该PDU set内序号大于该下行数据包的序号的数据包。
采用上述设计,对于RAN或UPF,可以实现保障协议数据单元集合内序号靠前顺序的下行数据包的传输,且在确定PDU set内传输失败的下行数据包时,可以丢弃该PDU set内序号大于该下行数据包的序号的数据包。
如图4所示,在UE使用的业务的数据流中的PDU Set包括多个上行数据包,且传输协议数据单元集合采用上述方式A传输时,来自UE的上行媒体数据包通过RAN发往UPF侧,并由UPF发往AS侧,即UE使用的XR业务开始后,如AR业务,UE侧会采集本地的媒体数据通过RAN发往UPF侧,随后相应发往应用服务器侧。具体流程如下:
S401至S405可以参考上述S301至S305。
S406:SMF向UE发送第一指示信息。
具体地,SMF将第一指示信息通过AMF发往UE侧。
此外,可选地,SMF还向UE发送第二通知消息,第二通知消息用于PDU Set的识别以及标记方案,即如何识别哪些上行数据包属于同一个PDU Set以及PDU Set内的上行数据包的顺序,并在上行数据包的PDCP层或SDAP层的头部进行标识的方法。
S407:SMF向RAN发送第一指示信息。
示例性地,SMF通过AMF向RAN发送第一指示信息。
另外,SMF根据来自PCF侧的PCC规则生成对应QoS描述信息(QoS profile),SMF还会向RAN侧发送QoS Profile,用于明确对于指定QoS流的相应QoS处理。
此外,SMF还向RAN发送第一通知消息,该第一通知消息还用于指示RAN根据上行数据包的PDCP层或SDAP层的头部信息确定哪些上行数据包属于同一个PDU Set,以及上行数据包在PDU Set内的顺序。
作为一种可选的替代方案,若SMF未向RAN发送第一指示信息,UE还可以向RAN发送第一指示信息,此时前面的步骤均为可选的流程。
S408:SMF向UPF发送第一指示信息。
示例性地,SMF根据来自PCF侧的PCC规则向UPF发送第一指示信息。示例性地,SMF向UPF发送N4规则,N4规则可以通过N4会话建立或修改流程携带给UPF,该N4规则可以包括第一指示信息。
可以理解的是,后续PDU会话建立流程,可以参考TS 23.502第4.3.2.1章节,此处不再赘述。
当上行媒体业务开始,也即终端设备使用的业务的上行数据流开始传输,执行如下S409至S415。
S409:UE识别来自终端应用层的业务的上行数据流中的上行数据包,确定哪些PDU数据包是属于同一个PDU Set以及PDU Set内上行数据包的顺序,UE确定PDU Set内各个上行数据包的顺序即确定协议数据单元集合内各个上行数据包的序号。
示例性地,若上行媒体业务通过RTP传输,UE可以根据RTP的头部信息确定以下内容:
(1)通过上行数据包的RTP的头部的“M”字段确定PDU Set的分界点,或者通过RTP头部的时间戳确定具有相同时间戳的上行数据包同属于一个PDU Set,或者通过RTP头部扩展字段中的“S”字段与“E”字段确定PDU Set的初始与结束数据包;
(2)通过上行数据包的RTP头部的序号确定PDU Set内上行数据包的顺序,即确定每个上行数据包的序号;或者根据上层发送或生成数据包的顺序确定PDU Set内上行数据包的顺序。
S410:在完成PDU Set以及PDU Set内上行数据包的顺序的识别之后,UE将每个上行数据包的序号添加到该上行数据包的PDCP层或SDAP层头部。
可选地,UE还可以将上行数据包在PDU Set内的顺序映射为相应的传输优先级添加到上行数据包中,如数据包的PDCP层或SDAP层头部。
S411:UE根据PDU Set内上行数据包的序号从小到大的顺序向RAN传输上行数据包。
若确定某个PDU set内上行数据包传输失败,则UE直接丢弃该PDU set内序号大于该上行数据包的序号的数据包,即丢弃该PDU Set内该上行数据包之后的其他数据包。
S412:RAN根据上行数据包的PDCP层的头部信息确定哪些上行数据包属于同一个PDU Set,以及上行数据包在PDU Set内的顺序。
S413:RAN根据PDU Set内上行数据包的序号从小到大的顺序向UPF传输上行数据包。
若确定某个PDU set内上行数据包传输失败,则RAN直接丢弃该PDU set内序号大于该上行数据包的序号的数据包。
可选地,RAN根据PDU Set内上行数据包的序号以及PDU Set的标识信息,将相应信息添加到上行数据包的GTP-U层,从而确保UPF能够识别对应的PDU Set以及其内各PDU数据包的前后顺序。
S414:UPF根据上行数据包的GTP-U层的头部信息或上行数据包的RTP层的头部信息确定哪些上行数据包属于同一个PDU Set,以及上行数据包在PDU Set内的顺序。
S415:UPF根据PDU Set内上行数据包的序号从小到大的顺序向AS传输上行数据包。
若确定某个PDU set内上行数据包传输失败,则UPF直接丢弃该PDU set内序号大于该上行数据包的序号的数据包。
该步骤为可选步骤。
采用上述设计,对于UE或RAN或UPF,可以实现保障协议数据单元集合内序号靠前顺序的上行数据包的传输,且在确定PDU set内传输失败的上行数据包时,可以丢弃该PDU set内序号大于该上行数据包的序号的数据包,即可以丢弃该PDU Set内在该传输失败数据包之后的数据包。
如图5所示,在终端设备使用的业务的数据流中的PDU Set包括多个下行数据包,且传输协议数据单元集合采用上述方式B传输时,来自AS的下行数据包首先到达UPF侧,并通过N3接口发往RAN侧,随后通过Uu接口发往UE侧,具体流程如下:
S501:AF向PCF发送第一指示信息和第二指示信息。
其中,第二指示信息用于传输成功率的预设比值。
另外,AF还会提供业务流描述信息,用于表征该业务流的特征信息,业务流描述信息包括IP五元组信息(源IP地址、目标IP地址、源端口号、目标端口号、传输协议)或三元组信息(目标IP地址、目标端口号、传输协议)、应用标识等,提供业务流描述信息以确保针对该业务流描述信息对应的目标业务流进行相应处理。
示例性地,AF通过能力开放接口向PCF发送第一指示信息。其中,若AF在可信域内,AF可以直接与PCF进行交互,即通过调用PCF的服务接口,如Npcf_PolicyAuthorization服务接口;若AF在非可信域,AF需要通过NEF与PCF交互,AF调用NEF的服务接口,如Nnef_AFSessionWithQoS服务接口,NEF调用PCF的服务接口。
S502:UE向AMF发送PDU会话建立请求消息。
当UE发起PDU会话建立或PDU会话修改流程时,UE向AMF发送PDU会话建立请求消息或PDU会话修改请求消息。此处仅以PDU会话建立过程为例进行说明。
示例性地,UE将PDU会话建立请求消息或会话修改请求消息通过NAS消息发往RAN侧,再由RAN将该NAS消息发往AMF侧。
S503:AMF向SMF发送来自UE侧的PDU会话建立请求。
可以理解的是,当UE发起PDU会话修改流程时,AMF向SMF发送来自UE侧的PDU会话修改请求。
S504:SMF向PCF发送会话管理策略关联建立请求消息。会话管理策略关联建立请求消息用于请求PCC规则。
S505:PCF向SMF发送会话管理策略关联建立响应消息。
示例性地,会话管理策略关联建立响应消息包括第一指示信息和第二指示信息,具体可以包括如下几种场景:
(1)会话管理策略关联建立响应消息包括PCC规则,其中,PCC规则包括第一指示信息和第二指示信息。
(2)会话管理策略关联建立响应消息包括PCC规则、第一指示信息和第二指示信息。
(3)会话管理策略关联建立响应消息包括PCC规则、第一指示信息,PCC规则包括第二指示信息。
(4)会话管理策略关联建立响应消息包括PCC规则、第二指示信息,PCC规则包括第一指示信息。
此外,第二指示信息还可以通过预配置的方式预配置到UE或UPF,此时,会话管理策略关联建立响应消息仅包括第一指示信息,第一指示信息可以在PCC规则内或PCC规则外,本申请对此不作限定。以下仅以会话管理策略关联建立响应消息包括第一指示信息和第二指示信息为例进行说明,即会话管理策略关联建立响应消息可以采用上述(1)至(4)中的任意一种方式携带第一指示信息和第二指示信息。
需要说明的是,若是UE发起的PDU会话建立流程,SMF发起会话管理策略关联建立流程,若是UE发起的PDU会话修改流程,SMF发起会话管理策略关联修改流程。此外,若S502未执行,则PCF可以主动发起会话管理策略关联修改流程,并向SMF发送PCC规则。
可选的,PCC规则还可以指示创建两个QoS流,两个QoS流分别承载每个PDU set的第一部分数据包和第二部分数据包。第一部分数据包由第一QoS流承载,第二部分数据包由第二QoS流承载。第一QoS流的优先级高于第二QoS流的优先级。第一部分数据包和第二部分数据包根据传输成功率的预设比值确定。第一部分数据包属于PDU Set内靠前传输成功率的预设比值的部分,而第二部分数据包属于PDU Set内其他的数据包。
S506:SMF向RAN发送第一指示信息和第二指示信息。
示例性地,SMF通过AMF向RAN发送第一指示信息和第二指示信息。
可选的,SMF还可以根据PCC规则生成两个QoS流的配置信息,向RAN发送两个QoS流的配置信息。
此外,SMF还向RAN发送第一通知消息,该第一通知消息还用于指示RAN根据下行数据包的GTP-U层的头部信息确定哪些下行数据包属于同一个PDU Set,以及下行数据包在PDU Set内的顺序,以及确定由第一QoS流承载的数据包和由第二QoS流承载的数据包。
作为一种可选的替代方案,若SMF未向RAN发送第一指示信息和第二指示信息,UE还可以向RAN发送第一指示信息和第二指示信息。
S507:SMF向UPF发送第一指示信息和第二指示信息。
示例性地,SMF根据来自PCF侧的PCC规则向UPF发送第一指示信息和/或第二指示信息。示例性地,SMF向UPF发送N4规则,N4规则可以通过N4会话建立或修改流程携带给UPF,该N4规则可以包括第一指示信息和第二指示信息。
可选的,N4规则还可以包括根据第二指示信息指示的传输成功率的预设比值将PDU Set分成第一部分数据包和第二部分数据包,并在第一部分数据包的GTP-U层的头部添加第一QoS流的标识,在第二部分数据包的GTP-U层的头部添加第二QoS流的标识。
此外,N4规则还可以包括PDU Set的识别以及标记方案,即如何识别哪些下行数据包属于同一个PDU Set以及PDU Set内的下行数据包的顺序,并在下行数据包的GTP-U层的头部进行标识的方法。
可以理解的是,后续PDU会话建立流程,可以参考TS 23.502第4.3.2.1章节,此处不再赘述。
当下行媒体业务开始,也即终端设备的下行业务数据流开始传输,比如对于XR业务,应用服务器接收到来自终端设备的上行数据后会相应生成对应的下行媒体数据,将下行媒体数据通过5G网络发往终端设备侧,执行如下S508至S514。
S508:UPF接收来自AS发往UE侧的下行业务数据流中的下行数据包。
S509:UPF根据N4规则确定哪些下行数据包属于同一个PDU Set以及PDU Set内数据包的顺序,UPF确定PDU Set内各个下行数据包的顺序包括确定各个下行数据包的序号。
具体可以参考上述S309。
S510:在完成PDU Set以及PDU Set内下行数据包的顺序的识别之后,UPF将每个下行数据包的序号添加到该下行数据包的GTP-U层头部。
可选地,UPF还可以将数据包在PDU Set内的顺序映射为相应的传输优先级添加到下行数据包的GTP-U层头部。
S511:UPF根据传输成功率的预设比值将PDU Set分成第一部分数据包和第二部分数据包,其中第一部分数据包为该PDU Set内靠前预设比例的数据包,第二部分数据包为后续的其他数据包;UPF在第一部分数据包的GTP-U层的头部添加第一QoS流的标识,在第二部分数据包的GTP-U层的头部添加第二QoS流的标识。
S512:UPF根据第一QoS流的标识将第一部分数据包通过第一QoS流传输,根据第二QoS流的标识将第二部分数据包通过第二QoS流传输。
若确定某个PDU set内下行数据包传输失败,则UPF直接丢弃该PDU set内序号大于该下行数据包的序号的数据包,即UPF直接丢弃该数据包之后的其他数据包。
S513:RAN根据下行数据包的GTP-U层的头部信息确定哪些下行数据包属于同一个PDU Set,以及下行数据包在PDU Set内的先后顺序,以及确定由第一QoS流承载的数据包和由第二QoS流承载的数据包。
S514:RAN根据第一QoS流的标识将第一部分数据包通过第一QoS流传输,根据第二QoS流的标识将第二部分数据包通过第二QoS流传输。
若确定某个PDU set内下行数据包传输失败,则RAN直接丢弃该PDU set内序号大于该下行数据包的序号的数据包,即RAN将两个QoS流中的同一个PDU Set进行协同处理,当发现某个下行数据包传输失败后,将会丢弃该PDU Set中序号大于该下行数据包序号的数据包。
采用上述设计,对于RAN或UPF,可以实现保障协议数据单元集合内序号靠前顺序的下行数据包的传输,且在确定PDU set内传输失败的下行数据包时,可以丢弃该PDU set内序号大于该下行数据包的序号的数据包。
如图6所示,在UE使用的业务的数据流中的PDU Set包括多个上行数据包,且传输协议数据单元集合采用上述方式B传输时,来自UE的上行媒体数据包通过RAN发往UPF侧,并由UPF发往AS侧,即UE使用的XR业务开始后,如AR业务,UE侧会采集本地的媒体数据通过RAN发往UPF侧,随后相应发往应用服务器侧。具体流程如下:
S601至S605可以参考上述S501至S505。
S606:SMF向UE发送第一指示信息和第二指示信息。
可选的,SMF还向UE发送两套QoS规则。两个QoS规则对应的两个QoS流分别承载每个PDU set的第一部分数据包和第二部分数据包。第一部分数据包由第一QoS流承载,第二部分数据包由第二QoS流承载。第一QoS流的优先级高于第二QoS流的优先级。第一部分数据包和第二部分数据包根据传输成功率的预设比值确定,即第一部分数据包为PDU Set内靠前预设比例的数据包,第二部分数据包为PDU Set内后续的数据包。
此外,SMF还向UE发送第二通知消息,第二通知消息用于PDU Set的识别以及标记方案,即如何识别哪些上行数据包属于同一个PDU Set以及PDU Set内的上行数据包的顺序,并在上行数据包的PDCP层的头部进行标识的方法,以及根据第二指示信息指示的传输成功率的预设比值将PDU Set分成第一部分数据包和第二部分数据包,并在第一部分数据包的SDAP层的头部添加第一QoS流的标识,在第二部分数据包的SDAP层的头部添加第二QoS流的标识。
S607:SMF向RAN发送第一指示信息和第二指示信息。
示例性地,SMF通过AMF向RAN发送第一指示信息和第二指示信息。
此外,SMF还向RAN发送第一通知消息,该第一通知消息还用于指示RAN根据上行数据包的PDCP层或SDAP层的头部信息确定哪些上行数据包属于同一个PDU Set,以及上行数据包在PDU Set内的顺序,以及确定由第一QoS流承载的数据包和由第二QoS流承载的数据包。
作为一种可选的替代方案,若SMF未向RAN发送第一指示信息,UE还可以向RAN发送第一指示信息和第二指示信息。
S608:SMF向UPF发送第一指示信息和第二指示信息。
示例性地,SMF根据来自PCF侧的PCC规则向UPF发送第一指示信息和第二指示信息。示例性地,SMF向UPF发送N4规则,N4规则可以通过N4会话建立或修改流程携带给UPF,该N4规则可以包括第一指示信息和第二指示信息。
可以理解的是,后续PDU会话建立流程,可以参考TS 23.502第4.3.2.1章节,此处不再赘述。
当上行媒体业务开始,也即终端设备的上行业务数据流开始传输,比如,XR业务开始后,终端设备将会通过5G网络发送来自该XR业务的上行数据到应用服务器侧。执行如下S609至S616。
S609:UE识别来自终端应用层的终端设备的上行业务数据流中的上行数据包,确定哪些PDU数据包是属于同一个PDU Set以及PDU Set内上行数据包的顺序,UE确定PDU Set内各个上行数据包的
先后顺序即确定各个上行数据包的序号。
具体可以参考上述步骤409。
S610:在完成PDU Set以及PDU Set内上行数据包的顺序的识别之后,UE将每个上行数据包的序号添加到该上行数据包的PDCP层头部。
可选地,UE还可以将上行数据包在PDU Set内的顺序映射为相应的传输优先级添加到上行数据包的PDCP层头部。
S611:UE根据传输成功率的预设比值将PDU Set分成第一部分数据包和第二部分数据包,并在第一部分数据包的SDAP层的头部添加第一QoS流的标识,在第二部分数据包的SDAP层的头部添加第二QoS流的标识。即第一部分数据包为PDU Set内靠前预设比例的数据包,第二部分数据包为PDU Set内后续的数据包。
S612:UE根据第一QoS流的标识将第一部分数据包通过第一QoS流传输,根据第二QoS流的标识将第二部分数据包通过第二QoS流传输。
若确定某个PDU set内上行数据包传输失败,则UE直接丢弃该PDU set内序号大于该上行数据包的序号的数据包,即丢弃PDU Set内该传输失败数据包之后的其他数据包。
S613:RAN根据上行数据包的PDCP层的头部信息确定哪些上行数据包属于同一个PDU Set,以及上行数据包在PDU Set内的顺序,以及根据上行数据包的SDAP层的头部信息确定由第一QoS流承载的数据包和由第二QoS流承载的数据包。
S614:RAN根据第一QoS流的标识将第一部分数据包通过第一QoS流传输,根据第二QoS流的标识将第二部分数据包通过第二QoS流传输。
若确定某个PDU set内上行数据包传输失败,则RAN直接丢弃该PDU set内序号大于该上行数据包的序号的数据包。
可选地,RAN根据PDU Set内上行数据包的序号以及PDU Set的标识信息,将相应信息添加到上行数据包的GTP-U层,从而确保UPF能够识别对应的PDU Set以及其内各PDU数据包的前后顺序。
S615:UPF根据上行数据包的GTP-U层的头部信息或上行数据包的RTP层的头部信息确定哪些上行数据包属于同一个PDU Set,以及上行数据包在PDU Set内的顺序。
S616:可选地,UPF根据PDU Set内上行数据包的序号从小到大的顺序向AS传输上行数据包。
若确定某个PDU set内上行数据包传输失败,则UPF直接丢弃该PDU set内序号大于该上行数据包的序号的数据包。
采用上述设计,对于UE或RAN或UPF,可以实现保障协议数据单元集合内序号靠前顺序的上行数据包的传输,且在确定PDU set内传输失败的上行数据包时,可以丢弃该PDU set内序号大于该上行数据包的序号的数据包。
图7示出了本申请实施例中所涉及的一种通信装置的可能的示例性框图,该装置700包括:收发模块720和处理模块710,收发模块720可以包括接收单元和发送单元。处理模块710用于对装置700的动作进行控制管理。收发模块720用于支持装置700与其他网络实体的通信。可选地,装置700还可以包括存储单元,所述存储单元用于存储装置700的程序代码和数据。
可选地,所述装置700中各个模块可以是通过软件来实现。
可选地,处理模块710可以是处理器或控制器,例如可以是通用中央处理器(central processing unit,CPU),通用处理器,数字信号处理(digital signal processing,DSP),专用集成电路(application specific integrated circuits,ASIC),现场可编程门阵列(field programmable gate array,FPGA)或者其他可编程逻辑器件、晶体管逻辑器件、硬件部件或者其任意组合。其可以实现或执行结合本申请实施例公开内容所描述的各种示例性的逻辑方框,模块和电路。所述处理器也可以是实现计算功能的组合,例如包含一个或多个微处理器组合,DSP和微处理器的组合等等。收发模块720可以是通信接口、收发器或收发电路等,其中,该通信接口是统称,在具体实现中,该通信接口可以包括多个接口,存储单元可以是存储器。
当装置700为第一设备或第一设备中的芯片时,装置700中的处理模块710可以支持装置700执行上文中各方法示例中第一设备的动作,例如可以支持装置700执行图2中的步骤200或步骤210。
收发模块720可以支持装置700与终端设备进行通信。
例如,处理模块710调用收发模块720执行:
在向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,确定所述协议数据单元集合中的第一数据包传输失败;丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包。
在一种可能的设计中,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;
处理模块710,还用于确定属于所述协议数据单元集合的多个数据包;将所述多个数据包中每个数据包的序号添加至对应数据包的头部。
在一种可能的设计中,处理模块710,还用于在接收到的第二数据包包括预设字段且接收到的第三数据包包括所述预设字段时,确定从所述第二数据包之后接收到的一个数据包至所述第三数据包属于所述协议数据单元集合;
或者,确定具有相同时间戳的数据包属于同一个协议数据单元集合。
在一种可能的设计中,收发模块720,用于从会话管理网元接收第一指示信息,所述第一指示信息用于指示在传输所述协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包。
在一种可能的设计中,处理模块710,还用于根据所述协议数据单元集合中多个数据包的序号从小到大的顺序进行传输。
在一种可能的设计中,所述协议数据单元集合包括第一部分数据包和第二部分数据包,所述第一部分数据包与所述第二部分数据包不重复,所述第一部分数据包的优先级高于所述第二部分数据包的优先级,所述第一部分数据包中的每个数据包的头部包括第一标识,所述第二部分数据包中的每个数据包的头部包括第二标识,所述第一部分数据包的总数与所述协议数据单元集合包括的数据包的总数的比值大于或等于传输成功率的预设比值;
处理模块710,还用于在确定所述协议数据单元集合中的第一数据包传输失败之前,根据在所述第一标识将所述第一部分数据包通过第一QoS流传输,根据在所述第二标识将所述第二部分数据包通过第二QoS流传输。
在一种可能的设计中,收发模块720,用于从会话管理网元接收第二指示信息,所述第二指示信息指示所述传输成功率的预设比值。
在一种可能的设计中,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;
处理模块710,还用于根据所述传输成功率的预设比值确定所述第一部分数据包和所述第二部分数据包,并在所述第一部分数据包中的每个数据包的头部添加所述第一标识,在所述第二部分数据包中的每个数据包的头部添加所述第二标识。
在一种可能的设计中,所述第一标识为所述第一QoS流的标识,所述第二标识为所述第二QoS流的标识。
在一种可能的设计中,若所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元,每个数据包的头部为用户面通用无线分组业务隧道协议GTP-U层头部;
若所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备,每个数据包的头部为分组数据汇聚协议PDCP层头部或者服务数据适配协议SDAP层头部。
在一种可能的设计中,处理模块710,还用于在丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包之后,继续传输序号小于所述第一数据包的序号的数据包。
在一种可能的设计中,处理模块710,还用于在确定所述协议数据单元集合中的第一数据包传输失败时,确定所述第一数据包的重传次数超过重传次数阈值;或者,确定所述第一数据包的传输时长超过传输时长阈值。
应理解,根据本申请实施例的装置700可对应于前述方法实施例中第一设备,并且装置700中的各个模块的操作和/或功能分别为了实现前述方法实施例中第一设备的方法的相应步骤,因此也可以实现前述方法实施例中的有益效果,为了简洁,这里不作赘述。
图8示出了根据本申请实施例的通信装置800的示意性结构图。如图8所示,所述装置800包括:处理器801。
当装置800为第一设备或第一设备中的芯片时,一种可能的实现方式中,当所述处理器801用于调
用接口执行以下动作:
在向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,确定所述协议数据单元集合中的第一数据包传输失败;丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包。
应理解,所述装置800还可用于执行前文实施例中第一设备侧的其他步骤和/或操作,为了简洁,这里不作赘述。
应理解,所述处理器801可以调用接口执行上述收发动作,其中,调用的接口可以是逻辑接口或物理接口,对此不作限定。可选地,物理接口可以通过收发器实现。可选地,所述装置800还包括收发器803。
可选地,所述装置800还包括存储器802,存储器802中可以存储上述方法实施例中的程序代码,以便于处理器801调用。
具体地,若所述装置800包括处理器801、存储器802和收发器803,则处理器801、存储器802和收发器803之间通过内部连接通路互相通信,传递控制和/或数据信号。在一个可能的设计中,处理器801、存储器802和收发器803可以通过芯片实现,处理器801、存储器802和收发器803可以是在同一个芯片中实现,也可能分别在不同的芯片实现,或者其中任意两个功能组合在一个芯片中实现。该存储器802可以存储程序代码,处理器801调用存储器802存储的程序代码,以实现装置800的相应功能。
上述本申请实施例揭示的方法可以应用于处理器中,或者由处理器实现。处理器可能是一种集成电路芯片,具有信号的处理能力。在实现过程中,上述方法实施例的各步骤可以通过处理器中的硬件的集成逻辑电路或者软件形式的指令完成。上述的处理器可以是通用处理器、数字信号处理器(digital signal processor,DSP)、专用集成电路(application specific integrated circuit,ASIC)、现成可编程门阵列(field programmable gate array,FPGA)或者其他可编程逻辑器件、分立门或者晶体管逻辑器件、分立硬件组件,还可以是***芯片(system on chip,SoC),还可以是中央处理器(central processor unit,CPU),还可以是网络处理器(network processor,NP),还可以是数字信号处理电路(digital signal processor,DSP),还可以是微控制器(micro controller unit,MCU),还可以是可编程控制器(programmable logic device,PLD)或其他集成芯片。可以实现或者执行本申请实施例中的公开的各方法、步骤及逻辑框图。通用处理器可以是微处理器或者该处理器也可以是任何常规的处理器等。结合本申请实施例所公开的方法的步骤可以直接体现为硬件译码处理器执行完成,或者用译码处理器中的硬件及软件模块组合执行完成。软件模块可以位于随机存储器,闪存、只读存储器,可编程只读存储器或者电可擦写可编程存储器、寄存器等本领域成熟的存储介质中。该存储介质位于存储器,处理器读取存储器中的信息,结合其硬件完成上述方法的步骤。
可以理解,本申请实施例中的存储器可以是易失性存储器或非易失性存储器,或可包括易失性和非易失性存储器两者。其中,非易失性存储器可以是只读存储器(read-only memory,ROM)、可编程只读存储器(programmable ROM,PROM)、可擦除可编程只读存储器(erasable PROM,EPROM)、电可擦除可编程只读存储器(electrically EPROM,EEPROM)或闪存。易失性存储器可以是随机存取存储器(random access memory,RAM),其用作外部高速缓存。通过示例性但不是限制性说明,许多形式的RAM可用,例如静态随机存取存储器(static RAM,SRAM)、动态随机存取存储器(dynamic RAM,DRAM)、同步动态随机存取存储器(synchronous DRAM,SDRAM)、双倍数据速率同步动态随机存取存储器(double data rate SDRAM,DDR SDRAM)、增强型同步动态随机存取存储器(enhanced SDRAM,ESDRAM)、同步连接动态随机存取存储器(synchlink DRAM,SLDRAM)和直接内存总线随机存取存储器(direct rambus RAM,DR RAM)。应注意,本文描述的***和方法的存储器旨在包括但不限于这些和任意其它适合类型的存储器。
应理解,在本申请实施例中,编号“第一”、“第二”…仅仅为了区分不同的对象,比如为了区分不同的参数信息或者消息,并不对本申请实施例的范围构成限制,本申请实施例并不限于此。
还应理解,在本申请的各种实施例中,上述各过程的序号的大小并不意味着执行顺序的先后,各过程的执行顺序应以其功能和内在逻辑确定。上述各个过程涉及的各种数字编号或序号仅为描述方便进行的区分,而不应对本申请实施例的实施过程构成任何限定。
还应理解,本文中术语“和/或”,仅仅是一种描述关联对象的关联关系,表示可以存在三种关系,例如,A和/或B,可以表示:单独存在A,同时存在A和B,单独存在B这三种情况。另外,本文中
字符“/”,一般表示前后关联对象是一种“或”的关系。
本申请中出现的类似于“项目包括如下中的一项或多项:A,B,以及C”表述的含义,如无特别说明,通常是指该项目可以为如下中任一个:A;B;C;A和B;A和C;B和C;A,B和C;A和A;A,A和A;A,A和B;A,A和C,A,B和B;A,C和C;B和B,B,B和B,B,B和C,C和C;C,C和C,以及其他A,B和C的组合。以上是以A,B和C共3个元素进行举例来说明该项目的可选用条目,当表达为“项目包括如下中至少一种:A,B,……,以及X”时,即表达中具有更多元素时,那么该项目可以适用的条目也可以按照前述规则获得。
本领域普通技术人员可以意识到,结合本文中所公开的实施例描述的各示例的单元及算法步骤,能够以电子硬件、或者计算机软件和电子硬件的结合来实现。这些功能究竟以硬件还是软件方式来执行,取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能,但是这种实现不应认为超出本申请的范围。
所属领域的技术人员可以清楚地了解到,为描述的方便和简洁,上述描述的***、装置和单元的具体工作过程,可以参考前述方法实施例中的对应过程,在此不再赘述。
在本申请所提供的几个实施例中,应该理解到,所揭露的***、装置和方法,可以通过其它的方式实现。例如,以上所描述的装置实施例仅仅是示意性的,例如,所述单元的划分,仅仅为一种逻辑功能划分,实际实现时可以有另外的划分方式,例如多个单元或组件可以结合或者可以集成到另一个***,或一些特征可以忽略,或不执行。另一点,所显示或讨论的相互之间的耦合或直接耦合或通信连接可以是通过一些接口,装置或单元的间接耦合或通信连接,可以是电性,机械或其它的形式。
所述作为分离部件说明的单元可以是或者也可以不是物理上分开的,作为单元显示的部件可以是或者也可以不是物理单元,即可以位于一个地方,或者也可以分布到多个网络单元上。可以根据实际的需要选择其中的部分或者全部单元来实现本实施例方案的目的。
另外,在本申请各个实施例中的各功能单元可以集成在一个处理单元中,也可以是各个单元单独物理存在,也可以两个或两个以上单元集成在一个单元中。
所述功能如果以软件功能单元的形式实现并作为独立的产品销售或使用时,可以存储在一个计算机可读取存储介质中。基于这样的理解,本申请的技术方案本质上或者说对现有技术做出贡献的部分或者该技术方案的部分可以以软件产品的形式体现出来,该计算机软件产品存储在一个存储介质中,包括若干指令用以使得一台计算机设备(可以是个人计算机,服务器,或者网络设备等)执行本申请各个实施例所述方法的全部或部分步骤。而前述的存储介质包括:U盘、移动硬盘、只读存储器ROM、随机存取存储器RAM、磁碟或者光盘等各种可以存储程序代码的介质。
Claims (34)
- 一种协议数据单元集合传输方法,其特征在于,该方法包括:在第一设备向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,所述第一设备确定所述协议数据单元集合中的第一数据包传输失败;所述第一设备丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包。
- 如权利要求1所述的方法,其特征在于,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;所述方法还包括:所述第一设备确定属于所述协议数据单元集合的多个数据包;所述第一设备将所述多个数据包中每个数据包的序号添加至对应数据包的头部。
- 如权利要求2所述的方法,其特征在于,所述第一设备确定属于所述协议数据单元集合的多个数据包,包括:在接收到的第二数据包包括预设字段且接收到的第三数据包包括所述预设字段时,所述第一设备确定从所述第二数据包之后接收到的一个数据包至所述第三数据包属于所述协议数据单元集合;或者,所述第一设备确定具有相同时间戳的数据包属于同一个协议数据单元集合。
- 如权利要求1-3任一项所述的方法,其特征在于,还包括:所述第一设备从会话管理网元接收第一指示信息,所述第一指示信息用于指示在传输所述协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包。
- 如权利要求1-4任一项所述的方法,其特征在于,还包括:所述第一设备根据所述协议数据单元集合中多个数据包的序号从小到大的顺序进行传输。
- 如权利要求1-4任一项所述的方法,其特征在于,所述协议数据单元集合包括第一部分数据包和第二部分数据包,所述第一部分数据包与所述第二部分数据包不重复,所述第一部分数据包的优先级高于所述第二部分数据包的优先级,所述第一部分数据包中的每个数据包的头部包括第一标识,所述第二部分数据包中的每个数据包的头部包括第二标识,所述第一部分数据包的总数与所述协议数据单元集合包括的数据包的总数的比值大于或等于传输成功率的预设比值;在所述第一设备确定所述协议数据单元集合中的第一数据包传输失败之前,还包括:所述第一设备根据在所述第一标识将所述第一部分数据包通过第一QoS流传输,根据在所述第二标识将所述第二部分数据包通过第二QoS流传输。
- 如权利要求6所述的方法,其特征在于,还包括:所述第一设备从会话管理网元接收第二指示信息,所述第二指示信息指示所述传输成功率的预设比值。
- 如权利要求6或7所述的方法,其特征在于,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;所述方法还包括:所述第一设备根据所述传输成功率的预设比值确定所述第一部分数据包和所述第二部分数据包,并在所述第一部分数据包中的每个数据包的头部添加所述第一标识,在所述第二部分数据包中的每个数据包的头部添加所述第二标识。
- 如权利要求6-8任一项所述的方法,其特征在于,所述第一标识为所述第一QoS流的标识,所述第二标识为所述第二QoS流的标识。
- 如权利要求6-9任一项所述的方法,其特征在于,若所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元,每个数据包的头部为用户面通用无线分组业务隧道协议GTP-U层头部;若所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备,每个数据包的头部为分组数据汇聚协议PDCP层头部或者服务数据适配协议SDAP层头部。
- 如权利要求1-10任一项所述的方法,其特征在于,还包括:在丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包之后,所述第一设备继续 传输序号小于所述第一数据包的序号的数据包。
- 如权利要求1-11任一项所述的方法,其特征在于,所述第一设备确定所述协议数据单元集合中的第一数据包传输失败,包括:所述第一设备确定所述第一数据包的重传次数超过重传次数阈值;或者,所述第一设备确定所述第一数据包的传输时长超过传输时长阈值。
- 一种协议数据单元集合传输方法,其特征在于,该方法包括:会话管理网元从策略控制网元接收第一指示信息,所述第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包;所述会话管理网元向第一设备发送所述第一指示信息。
- 如权利要求13所述的方法,其特征在于,还包括:所述会话管理网元从所述策略控制网元接收第二指示信息,所述第二指示信息用于指示传输成功率的预设比值,所述传输成功率的预设比值为所述协议数据单元集合中在出现传输失败的数据包之前需要传输成功的数据包总数与所述协议数据单元集合包括的数据包总数的最小比值;所述会话管理网元向所述第一设备发送所述第二指示信息。
- 一种协议数据单元集合传输方法,其特征在于,该方法包括:策略控制网元从应用功能网元接收第一指示信息,所述第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包;所述策略控制网元向会话管理网元发送所述第一指示信息。
- 如权利要求15所述的方法,其特征在于,还包括:所述策略控制网元从所述应用功能网元接收第二指示信息,所述第二指示信息用于指示传输成功率的预设比值,所述协议数据单元集合中在出现传输失败的数据包之前需要传输成功的数据包总数与所述协议数据单元集合包括的数据包总数的最小比值;所述策略控制网元向所述会话管理网元发送所述第二指示信息。
- 一种协议数据单元集合传输装置,其特征在于,所述装置为第一设备或第一设备内的芯片,该装置包括:处理单元和收发单元;所述处理单元调用所述收发单元执行:在向第二设备传输在终端设备上使用的业务的协议数据单元集合的过程中,确定所述协议数据单元集合中的第一数据包传输失败;丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包。
- 如权利要求17所述的装置,其特征在于,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;所述处理单元,还用于确定属于所述协议数据单元集合的多个数据包;将所述多个数据包中每个数据包的序号添加至对应数据包的头部。
- 如权利要求18所述的装置,其特征在于,所述处理单元,还用于在接收到的第二数据包包括预设字段且接收到的第三数据包包括所述预设字段时,确定从所述第二数据包之后接收到的一个数据包至所述第三数据包属于所述协议数据单元集合;或者,确定具有相同时间戳的数据包属于同一个协议数据单元集合。
- 如权利要求17-19任一项所述的装置,其特征在于,所述收发单元,用于从会话管理网元接收第一指示信息,所述第一指示信息用于指示在传输所述协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包。
- 如权利要求17-20任一项所述的装置,其特征在于,所述处理单元,还用于根据所述协议数据单元集合中多个数据包的序号从小到大的顺序进行传输。
- 如权利要求17-20任一项所述的装置,其特征在于,所述协议数据单元集合包括第一部分数据包和第二部分数据包,所述第一部分数据包与所述第二部分数据包不重复,所述第一部分数据包的优先级高于所述第二部分数据包的优先级,所述第一部分数据包中的每个数据包的头部包括第一标识,所述第二部分数据包中的每个数据包的头部包括第二标识,所述第一部分数据包的总数与所述协议数据单元 集合包括的数据包的总数的比值大于或等于传输成功率的预设比值;所述处理单元,还用于在确定所述协议数据单元集合中的第一数据包传输失败之前,根据在所述第一标识将所述第一部分数据包通过第一QoS流传输,根据在所述第二标识将所述第二部分数据包通过第二QoS流传输。
- 如权利要求22所述的装置,其特征在于,所述收发单元,用于从会话管理网元接收第二指示信息,所述第二指示信息指示所述传输成功率的预设比值。
- 如权利要求22或23所述的装置,其特征在于,所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备;或者所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元;所述处理单元,还用于根据所述传输成功率的预设比值确定所述第一部分数据包和所述第二部分数据包,并在所述第一部分数据包中的每个数据包的头部添加所述第一标识,在所述第二部分数据包中的每个数据包的头部添加所述第二标识。
- 如权利要求22-24任一项所述的装置,其特征在于,所述第一标识为所述第一QoS流的标识,所述第二标识为所述第二QoS流的标识。
- 如权利要求22-25任一项所述的装置,其特征在于,若所述协议数据单元集合包括多个下行数据包,所述第一设备为用户面网元,每个数据包的头部为用户面通用无线分组业务隧道协议GTP-U层头部;若所述协议数据单元集合包括多个上行数据包,所述第一设备为终端设备,每个数据包的头部为分组数据汇聚协议PDCP层头部或者服务数据适配协议SDAP层头部。
- 如权利要求17-26任一项所述的装置,其特征在于,所述处理单元,还用于在丢弃所述协议数据单元集合中序号大于所述第一数据包的序号的数据包之后,继续传输序号小于所述第一数据包的序号的数据包。
- 如权利要求17-27任一项所述的装置,其特征在于,所述处理单元,还用于在确定所述协议数据单元集合中的第一数据包传输失败时,确定所述第一数据包的重传次数超过重传次数阈值;或者,确定所述第一数据包的传输时长超过传输时长阈值。
- 一种协议数据单元集合传输装置,其特征在于,所述装置为会话管理网元或会话管理网元内的芯片,该装置包括:处理单元和收发单元;所述处理单元调用所述收发单元执行:从策略控制网元接收第一指示信息,所述第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包;向第一设备发送所述第一指示信息。
- 如权利要求29所述的装置,其特征在于,所述收发单元,用于从所述策略控制网元接收第二指示信息,所述第二指示信息用于指示传输成功率的预设比值,所述传输成功率的预设比值为所述协议数据单元集合中在出现传输失败的数据包之前需要传输成功的数据包总数与所述协议数据单元集合包括的数据包总数的最小比值;向所述第一设备发送所述第二指示信息。
- 一种协议数据单元集合传输装置,其特征在于,所述装置为策略控制网元或策略控制网元内的芯片,该装置包括:处理单元和收发单元;所述处理单元调用所述收发单元执行:从应用功能网元接收第一指示信息,所述第一指示信息用于指示在传输协议数据单元集合的过程中确定传输失败的数据包,则丢弃所述协议数据单元集中序号大于所述传输失败的数据包的序号的数据包;向会话管理网元发送所述第一指示信息。
- 如权利要求31所述的装置,其特征在于,所述收发单元,用于从所述应用功能网元接收第二指示信息,所述第二指示信息用于指示传输成功率的预设比值,所述协议数据单元集合中在出现传输失败的数据包之前需要传输成功的数据包总数与所述协议数据单元集合包括的数据包总数的最小比值;向所述会话管理网元发送所述第二指示信息。
- 一种通信装置,其特征在于,包括处理器和接口电路,所述接口电路用于接收来自所述通信装置之外的其它通信装置的信号并传输至所述处理器或将来自所述处理器的信号发送给所述通信装置之外的其它通信装置,所述处理器通过逻辑电路或执行代码指令用于实现如权利要求1至16中任一项所 述的方法。
- 一种计算机可读存储介质,其特征在于,所述存储介质中存储有计算机程序或指令,当所述计算机程序或指令被通信装置执行时,实现如权利要求1至16中任一项所述的方法。
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