CN115361591A - File transmission method based on 5G SBA and satellite-ground cooperative transmission system - Google Patents
File transmission method based on 5G SBA and satellite-ground cooperative transmission system Download PDFInfo
- Publication number
- CN115361591A CN115361591A CN202210991680.2A CN202210991680A CN115361591A CN 115361591 A CN115361591 A CN 115361591A CN 202210991680 A CN202210991680 A CN 202210991680A CN 115361591 A CN115361591 A CN 115361591A
- Authority
- CN
- China
- Prior art keywords
- file
- network
- satellite
- mec server
- user
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000005540 biological transmission Effects 0.000 title claims abstract description 71
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004891 communication Methods 0.000 claims abstract description 16
- 239000012634 fragment Substances 0.000 claims abstract description 16
- 238000012546 transfer Methods 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 230000001052 transient effect Effects 0.000 claims description 8
- 230000002441 reversible effect Effects 0.000 claims description 5
- 238000013459 approach Methods 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000036316 preload Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 claims description 4
- 238000013475 authorization Methods 0.000 claims description 3
- 230000007423 decrease Effects 0.000 claims description 3
- 238000013507 mapping Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 abstract description 10
- 238000005259 measurement Methods 0.000 abstract description 4
- 230000006870 function Effects 0.000 description 24
- 238000007726 management method Methods 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 206010044565 Tremor Diseases 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 229920003087 methylethyl cellulose Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000011664 signaling Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6193—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a satellite
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/21—Server components or server architectures
- H04N21/218—Source of audio or video content, e.g. local disk arrays
- H04N21/2187—Live feed
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/231—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion
- H04N21/23106—Content storage operation, e.g. caching movies for short term storage, replicating data over plural servers, prioritizing data for deletion involving caching operations
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/60—Network structure or processes for video distribution between server and client or between remote clients; Control signalling between clients, server and network components; Transmission of management data between server and client, e.g. sending from server to client commands for recording incoming content stream; Communication details between server and client
- H04N21/61—Network physical structure; Signal processing
- H04N21/6156—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network
- H04N21/6181—Network physical structure; Signal processing specially adapted to the upstream path of the transmission network involving transmission via a mobile phone network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W76/00—Connection management
- H04W76/10—Connection setup
- H04W76/15—Setup of multiple wireless link connections
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Landscapes
- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Multimedia (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Databases & Information Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
The invention belongs to the technical field of satellite communication and ground communication cooperative transmission, and particularly discloses a file transmission method based on a 5G SBA and a satellite-ground cooperative transmission system, wherein in the method, a VNF in an MEC server receives and analyzes a file request instruction by acquiring an Http video stream file request initiated by a user; the VNF controls the MEC server to obtain and analyze a file list from the source end, and the MEC server establishes a plurality of parallel TCP connections with the source site and downloads file segments according to the content of the file list and caches the file segments locally; if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided to the user; otherwise, the VNF forwards the content request to the source site and retrieves. By adopting the technical scheme, satellite communication is used as a return stroke of the 5G network, and the VNF technology is introduced into an edge measurement MEC server of a network architecture, so that the phenomena of high delay and insufficient coverage during global video live broadcast are effectively relieved.
Description
Technical Field
The invention belongs to the technical field of satellite communication and ground communication cooperative transmission, and relates to a file transmission method and a satellite-ground cooperative transmission system based on 5G SBA.
Background
In recent years, with the global spread of 5G networks, live streaming media based on the HTTP (Hyper Text Transfer Protocol) Protocol has become more popular, and more users have started to generate 4K live streaming media through social media such as tremble, facebook, youTube, and the like. These applications require faster, smoother data transfer to support a better immersive experience.
Currently, most video streaming applications, such as MPEG-DASH or Apple HTTP real-time streaming-HLS, follow the hypertext transfer protocol (HTTP), which segments a video sequence into multiple segments and transmits them in a sequence file format as required. Generally, such files are transmitted through a TCP (Transmission Control Protocol) underlying Protocol.
According to the traditional technical scheme, the video stream file is transmitted in a unicast serial transmission mode. However, in recent years, with the development of the 5G edge side, a user can pre-extract requested hot streaming media content from a video source end through a parallel transport control protocol, and pre-load the content by means of a cache function of the edge side, so as to guarantee the QoE of the user. Given that live destination users may be distributed elsewhere around the globe, far from the live source, conventional terrestrial communication approaches have been unable to meet the demands of the transoceanic/continental live industry at a time delay.
By combining the rapid development of low-orbit satellite internet in recent years, the characteristics of low time delay and wide coverage of the low-orbit satellite communication serving as a backhaul network are considered, and the high-efficiency distribution of the streaming media content is realized. It is also considered that the slow start and retransmission mechanism of the TCP transmission protocol does not accommodate satellite high dynamic packet data transmission. Therefore, a mechanism for compensating the transmission defect of TCP in the satellite-ground cooperative network is urgently needed. In addition, the 5G Service Based Architecture (SBA) has been standardized, which will help the present invention to adopt a new context-aware content scheme and provide QoE guarantees to users in the live broadcast industry using satellite links.
Disclosure of Invention
The invention aims to provide a file transmission method based on 5G SBA and a satellite-ground cooperative transmission system, which effectively relieve the phenomena of high delay and insufficient coverage in global video live broadcast.
In order to achieve the purpose, the basic scheme of the invention is as follows: a file transmission method based on 5G SBA comprises the following steps:
acquiring a request of an Http video stream file initiated by a user, wherein a VNF in an MEC server with a working range covering the user receives a file request instruction and analyzes the request;
the VNF serves as a reverse file agent and controls the MEC server to obtain a file list from the source end and analyze the file list;
the MEC server establishes a plurality of parallel TCP connections with the source site and downloads file segments according to the file list content, and caches the file segments locally;
if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided for the user; otherwise, the VNF forwards the content request to the source site and retrieves.
The operating principle and the beneficial effects of the basic scheme are as follows: according to the scheme, satellite communication is used as a backhaul of a 5G network, a VNF technology is introduced into an edge measurement MEC server of a network architecture and used as a relay resource pool in a transmission path of video content from a source site to a user.
The phenomena of high delay and insufficient coverage in global video live broadcasting can be effectively relieved by adopting low-orbit satellite communication as a return stroke, and the situation of high satellite link load pressure caused by repeated requests for the same video stream in the transmission process can be effectively relieved by adopting a VNF combined MEC server technology, so that the bandwidth is saved for the satellite link, and the 4K video stream live broadcasting service with QoE guarantee can be effectively supported.
Further, the VNF performs context awareness according to the file segments distributed to the user, and instructs the MEC server to search and preload subsequent files to the source site.
Continuous distribution of data from a source side to a destination side is achieved by employing context-aware based transient segment content holding techniques.
Further, the MEC server as a processing repeater divides the transmission path of the end-to-end content into RAN and a satellite backhaul network, and uses low earth orbit satellite communication as a backhaul.
This reduces the initial start-up delay problem faced by the TCP protocol and also improves better content delivery performance.
Furthermore, each MEC server monitors the real-time live broadcast service sessions of all clients under the coverage area of the MEC server, and the MEC server aggregates all session requests of the same live broadcast data stream under the coverage area of the MEC server;
a core UPF (UPF in a 5G core network) monitors the popularity of a live video stream and dynamically adjusts a transmission strategy for transmitting the live stream from a source end server to a user side MEC server; if the video content is popular, the ground gateway station instructs a satellite to distribute the video stream file to a plurality of MEC servers by adopting a multicast protocol;
if the popularity of the video stream decreases, the core UPF may perform a source-to-customer MEC server data transfer multicast protocol to unicast protocol switch.
Simple structure and easy use.
The invention also provides a 5G SBA satellite-ground cooperative transmission system based on the method, which comprises a user, a user side MEC server and a satellite, wherein a satellite channel is used as a return link, the user utilizes partial virtualized calculation and storage resources of the MEC server and containerizes and deploys VNF to execute cache and transient section content storage operation, and a signal output end of the user is connected with an input end of the MEC server;
a VNF in an MEC server receives and analyzes a file request instruction initiated by a user; the VNF serves as a reverse file agent and controls the MEC server to obtain a file list from the source end and analyze the file list; the VNF controls the MEC server to download the file segments to the source site according to the file list content, and the file segments are cached locally; if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided to the user; otherwise, the VNF forwards the content request to the source site and retrieves.
The system combines a 5G core network based on SBA and a satellite backhaul to support a live broadcast streaming media application program, expands the communication coverage, reduces the data transmission delay of the live broadcast streaming media, and is more favorable for global data sharing of live broadcast services compared with the existing transmission mode. The VNF technology is introduced into an edge measurement MEC server of a network architecture and serves as a relay resource pool in a transmission path of video content from a source site to a user, so that the user can deploy own VNF on the MEC server of a 5G mobile edge, content operations such as instant segment holding can be executed, and multicast can be realized on an application layer. The continuous distribution of data from a source end to a destination end is realized by adopting a transient segment content holding technology based on context sensing, and the receiving quality of the video streaming media content of a user is guaranteed.
Further, a 5G mobile network operator leases a satellite channel from the satellite network operator as a backhaul link, the 5G mobile network operator controls the MEC server, and the 5G mobile network operator is used to provide mobility services;
the 5G mobile network operator comprises a ground core network, a ground bearing network and a wireless access network, wherein the ground bearing network is used for connecting the ground core network and the wireless access network.
A 5G mobile network operator may provide mobility service content including core network access and mobility management functions, session management, user plane functions, authentication services, policy control functions, unified data services, application functions, and data network functions, among others.
Further, the ground core network comprises a PCF network element, an SMF network element, an AF network element, a NEF network element, and an AMF network element, and the PCF network element converts instructions in other control plane network elements into instructions interpretable by a VNF corresponding to a user;
the SMF network element receives the transmission strategy from the PCF network element and transmits the transmission strategy to the VNF to be executed by the VNF; the SMF network element processes context awareness information updating and monitoring feedback from the VNF and sends the context awareness information updating and monitoring feedback to the AF network element, so that a strategy is conveniently updated;
the AF network element provides context information for identifying the video stream of each video content provider to a 5G mobile network operator; the AF network element processes the context information monitoring report uploaded by the MEC server through the SMF network element and can adjust video content operation, the AF network element sends the updated transmission strategy to the PCF network element, and the PCF network element re-adjusts the format of the transmission strategy and sends the transmission strategy to the SMF network element for transmission and execution;
the NEF network element is connected with the AF network element and other control plane network elements, and the authentication, authorization and user mobility management of the AMF network element control plane are realized.
And the control plane is formed by utilizing the network elements, so that the operation is convenient.
Further, the radio access network comprises RAN equipment, an edge MEC server and an edge UPF network element;
the RAN equipment comprises equipment including a base station system and is used for accessing of a terminal user;
the edge MEC server is used for localized service deployment and is convenient to approach service deployment based on a traditional data center, data forwarding, network connection and third-party virtual service support;
and the edge UPF network element is used for responding the request of the SMF network element, connecting the RAN equipment and an external data network, encapsulating and decapsulating a protocol, routing and forwarding a packet, checking a data packet and mapping QoS Flow, and finishing the implementation of user plane gating, redirection and Flow steering strategy rules.
Simple structure and easy use.
Further, the content provided by the user depends on real-time original information generated in the terminal equipment, and the original information is uploaded to a cloud service center through RTMP;
the cloud service center encodes the original information and compresses the original information into a plurality of real-time RTSP streams in real time at different bit rates;
according to the underlying transport protocol, each RTSP stream is periodically packaged into a series of file segments, the information of which is stored in a regularly updated manifest file.
The operation is simple, and the data transmission is facilitated.
Further, the satellite network operator comprises a satellite gateway, a satellite terminal, a network control center and a network management center;
the satellite gateway and the satellite terminal are interconnected through one or more channels of the satellite, the satellite gateway uses various network topological structures, and one satellite gateway can provide access to satellite terminal groups of different logic groups;
the network control center provides real-time control of the satellite network and the network management center is used to manage the system elements of the satellite network.
The satellite network operator can maintain, manage, deploy and operate the satellite platform through each device, and the use is facilitated.
Drawings
FIG. 1 is a schematic structural diagram of a 5G SBA-based file transfer method according to the present invention;
FIG. 2 is a schematic diagram of the structure of the user content generation of the file transmission method based on 5G SBA according to the present invention;
fig. 3 is a schematic view of a session structure of a video stream request process based on the 5G SBA file transmission method of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, unless otherwise specified and limited, it is to be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection via an intermediate medium, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The invention discloses a file transmission method based on a 5G SBA, and provides a satellite-ground network cooperative transmission architecture based on the 5G SBA, which utilizes satellite communication as a return stroke of the 5G network, considers high-speed and low-delay transmission required in a real-time live broadcast application scene, simultaneously adopts diversified equipment in the satellite-ground cooperative network, has heterogeneous and complex network, introduces a VNF technology in an edge measurement MEC server of the network architecture as a relay resource pool in a transmission path of video content from a source station to a user, and realizes continuous distribution of data from a source end to a target side by adopting a transient segment content holding technology based on context awareness. VNF technology separates network functions from proprietary hardware so that they can be run in general-purpose commodity servers, switches and storage units without the operator having to install new proprietary equipment within the network.
Compared with the prior art, the phenomena of high delay and insufficient coverage during global live video broadcasting can be effectively relieved by adopting low-orbit satellite communication as a backhaul, functions which can be realized on a physical device are realized in a software mode by adopting a Virtualized Network Function (VNF), and the condition of large load pressure of a satellite link caused by repeated requests on the same video stream in a transmission process can be effectively relieved by combining the technology of an integrated multi-access edge (MEC), so that the bandwidth of the satellite link is saved, and the structure and the method can effectively support the live video streaming service with QoE guarantee for the 4K video stream.
As shown in fig. 1, the file transfer method based on 5G SBA includes the following steps:
acquiring a file request initiated by a user (such as a request of an HTTP video streaming file, the HTTP file encapsulation and disassembly becomes more flexible, simpler and faster, and the HTTP allows transmission of any type of data object, which is beneficial to reducing the processing delay of a streaming media file on a server), wherein a working range covers a VNF in an MEC server of the user to receive a file request instruction and analyze the request (specifically, an analysis method of an HTTP protocol can be utilized); typically, the MEC server is located near the user to ensure low latency in access; the MEC server is used as a processing repeater to divide a transmission path of End-to-End (E2E) content into an RAN and a satellite backhaul network, low earth orbit satellite communication is used as a backhaul, the problem of initial start delay of a TCP protocol is reduced, and better content delivery performance is improved;
after the MEC server acquires the text list, the corresponding content on the list is indexed to the source end according to the list, and an analysis method of the HTTP protocol can be specifically utilized;
the MEC server establishes a plurality of parallel TCP connections with the source site and downloads file segments according to the file list content, and caches the file segments locally; the VNF performs context sensing according to the file fragments distributed to the user, predicts subsequent file information required by the client, and guides the MEC server to search and preload subsequent files to a source site;
if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided for the user; otherwise, the VNF forwards the content request to the source site and retrieves.
In a preferred embodiment of the present invention, each MEC server monitors all clients' real-time live service sessions (real-time QoE status, such as buffering and video quality, etc.) under its coverage, and the MEC server performs necessary content operations, such as transient segment holding, etc., so as to provide customized QoE guarantee with context awareness for each user and each session. Meanwhile, the MEC server may perform transport layer performance enhancement techniques to enhance QoE guarantees at the application layer. The MEC server aggregates all session requests of the same direct-broadcast data stream under the coverage range of the MEC server, and in the coverage range of the same MEC server, no matter how many sessions request the same video stream, only a stream dialogue is needed to be established between the MEC server and a content source end to realize application layer multicast.
The core UPF monitors the popularity of the live video stream and dynamically adjusts the transmission strategy of the live stream transmitted from the source server to the user side MEC server; and if the video content is popular, the ground gateway station instructs the satellite to distribute the video stream file to a plurality of MEC servers by adopting a multicast protocol. For example, the core UPF detects that a live video stream is popular among a plurality of distributed MEC servers, and the core UPF may decide that a source transmits a video stream file to a plurality of MEC servers using a multicast protocol, such as FLUTE protocol. If the popularity of the video stream decreases, the core UPF may perform a source-to-customer MEC server data transfer multicast protocol to unicast protocol switch.
The invention also provides a 5G SBA satellite-ground cooperative transmission system based on the method, which comprises users (namely Video Content providers, VCPs), user side MEC servers and satellites, wherein the users comprise mobile devices such as mobile phones and notebook computers. The satellite channel is taken as a backhaul link, and the satellite backhaul comprises a satellite, a satellite link and a ground gateway. The user utilizes partial virtualized computing and storage resources of the MEC server, and deploys the VNF in a containerized mode to execute caching and transient section content storage operations, and a signal output end of the user is connected with an input end of the MEC server. MECs are typically deployed at a short distance from the end user where they can wirelessly cover the terminal.
A VNF in an MEC server receives and analyzes a file request instruction initiated by a user; the VNF serves as a reverse file agent and controls the MEC server to obtain a file list from the source end and analyze the file list; the VNF controls the MEC server to download the file segments to the source site according to the content of the file list, and the file segments are cached locally; if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided for the user; otherwise, the VNF forwards the content request to the source site and retrieves.
In a preferred embodiment of the present invention, a 5G Mobile Network Operator (MNO) leases a Satellite channel from a Satellite Network Operator (SNO) as a backhaul link, the 5G Mobile Network Operator controls an MEC server, and the 5G Mobile Network Operator is configured to provide a mobility service. The 5G MNO virtualizes its Computing and storage resources and leases it to VCPs, which can deploy Virtualized Network Functions (VNFs) in Multi-access Edge Computing (MEC) servers. The SNO leases the satellite channel bandwidth resources to the 5G MNO, so that the SNO can conveniently use a standard ground return link and also use a satellite network as a return link.
More preferably, the 5G mobile Network operator includes a terrestrial Core Network (CN), a terrestrial bearer Network and a radio access Network, and the terrestrial core Network adopts a mechanism of separating a user plane and a control plane in the 5G standard. The ground bearing network is used for connecting a ground core network and a wireless access network and is responsible for data transmission, and the structure of the ground bearing network comprises a forward transmission network, a middle transmission network and a return transmission network. A 5G mobile network operator may provide mobility service content including core network access and mobility management functions, session management, user plane functions, authentication services, policy control functions, unified data services, application functions, and data network functions, among others.
The ground core network comprises a PCF (policy control function) network element, an SMF (session management function) network element, an AF (application function) network element, an NEF (network open function) network element and an AMF (mobility management function) network element, the PCF network element converts instructions in other control plane network elements (such as the SMF network element and the AF network element) into instructions which can be read by a VNF corresponding to a user, and all the network elements are connected and communicated through a bus. Most control plane network elements are operated by MNOs, but AF network elements are typically controlled by third parties, such as CPs or the like.
The SMF network element receives the transmission strategy from the PCF network element and transmits the transmission strategy to the VNF, and the transmission strategy is executed by the VNF; the SMF network element processes the context awareness information update and monitoring feedback from the VNF and sends it to the AF network element, which facilitates updating its policy (workflow inside the 5G core network).
The AF network element provides the 5G mobile network operator with context information identifying the video stream of each video content provider, including the destination IP address and port number, etc. The AF network element processes the context information monitoring report uploaded by the MEC server through the SMF network element and can adjust video content operation (such as cache or segment storage and the like), the AF network element sends the updated transmission strategy to the PCF network element, and the PCF network element re-adjusts the format of the transmission strategy and sends the transmission strategy to the SMF network element for transmission and execution.
The NEF network element connects the AF network element with other control plane network elements, and the authentication and authorization of the AMF network element control plane and the user mobility management.
In a preferred embodiment of the present invention, the Radio Access Network includes a RAN (Radio Access Network) device, an edge MEC server, and an edge UPF Network element, and the RAN device includes a base station system and is used for accessing a terminal user.
The edge MEC server is used for providing IT resource pool equipment which is constructed based on a miniaturized hardware platform and comprises resources such as calculation, memory, storage, network and the like, is used for localized service deployment, is convenient to approach service deployment based on a traditional data center, and has the functions of data forwarding, network connection, third-party virtual service support and the like.
An edge-Plane Function (User-Plane Function, which is usually run on the MEC server) is configured to respond to a request of the SMF network element, connect the RAN device and the external data network, perform protocol encapsulation and decapsulation, packet routing and forwarding, packet inspection, and QoS Flow mapping, and implement policy rules such as User Plane gating, redirection, and traffic steering.
In a preferred embodiment of the present invention, as shown in fig. 2 and fig. 3, the content provided by the user depends on Real-Time original information (APP downloaded in the terminal device, such as Real-Time video original information generated by jittering, facebook, youTube, etc.) generated in the terminal device, and the original information is uploaded to the cloud service center through an RTMP (Real-Time Messaging Protocol).
The cloud service center encodes the original information and compresses the encoded original information into a plurality of Real-Time RTSP (Real-Time Streaming Protocol) streams in Real Time at different bit rates (the bit rates are the sizes specified in the RTSP Real-Time Streaming Protocol). According to the underlying transport protocol (e.g., HLS/DASH), each RTSP stream is periodically packaged into a series of file segments, the information of which is stored in a periodically updated manifest file.
In a preferred embodiment of the present invention, the Satellite Network operator includes a Satellite Gateway (SG), a Satellite Terminal (ST, i.e., a Satellite ground station), a Network Control Center (NCC), and a Network Management Center (NMC).
The satellite gateways and satellite terminals are interconnected through one or more channels of the satellite, the satellite gateways use various network topologies (e.g., star, multi-star, mesh hybrid star, etc.), and one satellite gateway may provide access to groups of satellite terminals of different logical groups.
A network control center provides real-time control of the satellite network (e.g., connection control, including signaling required to establish, supervise, and release connections), and a network management center manages system elements of the satellite network (e.g., configuration, fault, performance, and security management).
The scheme introduces a context-aware-based HTTP video stream transient segment content holding and caching technology, a node is positioned between a RAN and a backhaul network and can be realized through a VNF in an MEC server, the MEC can periodically issue a sequence request list according to the needs of a user, and the list contains the latest information about segment availability on a real-time video source. Since the MEC acquires a plurality of video clips of a certain user, the terminal can mistakenly assume that a large amount of cache contents exist in the MEC, and the request is not made. At this time, the MEC may process the instructions of other users requesting the same video at the same time, and may download a plurality of subsequent video segments at the same time through the parallel TCP protocol, thereby ensuring that the users receive real-time high-quality video frames.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A file transmission method based on 5G SBA is characterized by comprising the following steps:
acquiring a request of an Http video stream file initiated by a user, wherein a VNF in an MEC server with a working range covering the user receives a file request instruction and analyzes the request;
the VNF serves as a reverse file agent and controls the MEC server to obtain a file list from the source end and analyze the file list;
the MEC server establishes a plurality of parallel TCP connections with the source site and downloads file segments according to the content of the file list, and the file segments are locally cached;
if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided to the user; otherwise, the VNF forwards the content request to the source site and retrieves.
2. The 5G SBA-based file transfer method of claim 1, wherein the VNF performs context awareness and instructs the MEC server to search and preload subsequent files to the source site according to the file fragments distributed to users.
3. The 5G SBA-based file transfer method of claim 1, wherein the MEC server as a processing repeater splits the transmission path of the end-to-end content into RAN and satellite backhaul network, and uses low-earth satellite communication as backhaul.
4. The 5G SBA-based file transfer method of claim 1, wherein each MEC server monitors the real-time live broadcast service sessions of all clients under its coverage, and the MEC server aggregates all session requests of the same live broadcast data stream under its coverage;
the core UPF monitors the popularity of the live video stream and dynamically adjusts the transmission strategy of the live stream transmitted from the source server to the user side MEC server; if the video content is popular, the ground gateway station instructs a satellite to distribute the video stream file to a plurality of MEC servers by adopting a multicast protocol;
if the popularity of the video stream decreases, the core UPF may perform a source-to-customer MEC server data transfer multicast protocol to unicast protocol switch.
5. A satellite-ground cooperative transmission system based on the method of any one of claims 1 to 4, comprising a user, a user-side MEC server and a satellite, wherein the satellite channel is used as a backhaul link, the user utilizes partially virtualized computing and storage resources of the MEC server and containerizes and deploys VNF to perform caching and transient segment content saving operations, and a signal output end of the user is connected with an input end of the MEC server;
a VNF in an MEC server receives and analyzes a file request instruction initiated by a user; the VNF serves as a reverse file proxy and controls the MEC server to obtain a file list from the source end and analyze the file list; the VNF controls the MEC server to download the file segments to the source site according to the file list content, and the file segments are cached locally; if the file fragment requested by the user is stored in the MEC server, the file fragment is immediately provided to the user; otherwise, the VNF forwards the content request to the source site and retrieves.
6. The satellite-terrestrial coordinated transmission system according to claim 5, wherein the 5G mobile network operator leases a satellite channel from the satellite network operator as a backhaul link, the 5G mobile network operator controls the MEC server, the 5G mobile network operator provides mobility services;
the 5G mobile network operator comprises a ground core network, a ground bearing network and a wireless access network, wherein the ground bearing network is used for connecting the ground core network and the wireless access network.
7. The satellite-ground cooperative transmission system according to claim 6, wherein the ground core network comprises a PCF network element, an SMF network element, an AF network element, a NEF network element, and an AMF network element, and the PCF network element converts the instructions in the other control plane network elements into instructions interpretable by the VNF corresponding to the user;
the SMF network element receives the transmission strategy from the PCF network element and transmits the transmission strategy to the VNF, and the transmission strategy is executed by the VNF; the SMF network element processes context awareness information updating and monitoring feedback from the VNF and sends the context awareness information updating and monitoring feedback to the AF network element, so that a strategy is conveniently updated;
the AF network element provides context information for identifying the video stream of each video content provider to a 5G mobile network operator; the AF network element processes the context information monitoring report uploaded by the MEC server through the SMF network element and can adjust video content operation, the AF network element sends the updated transmission strategy to the PCF network element, and the PCF network element re-adjusts the format of the transmission strategy and sends the transmission strategy to the SMF network element for transmission and execution;
the NEF network element is connected with the AF network element and other control plane network elements, and the authentication, authorization and user mobility management of the AMF network element control plane are realized.
8. The satellite-to-ground cooperative transmission system according to claim 6, wherein the radio access network comprises RAN equipment, an edge MEC server, and an edge UPF network element;
the RAN equipment comprises equipment including a base station system and is used for accessing of a terminal user;
the edge MEC server is used for localized service deployment, and is convenient to approach service deployment, data forwarding, network connection and third-party virtual service support based on a traditional data center;
and the edge UPF network element is used for responding the request of the SMF network element, connecting the RAN equipment and an external data network, encapsulating and decapsulating a protocol, routing and forwarding a packet, checking a data packet and mapping QoS Flow, and finishing the implementation of user plane gating, redirection and Flow steering strategy rules.
9. The satellite-ground cooperative transmission system according to claim 5, wherein the content provided by the user depends on real-time raw information generated in the terminal device, and the raw information is uploaded to the cloud service center through the RTMP;
the cloud service center encodes the original information and compresses the original information into a plurality of real-time RTSP streams in real time at different bit rates;
according to the underlying transport protocol, each RTSP stream is periodically packaged into a series of file segments, the information of which is stored in a regularly updated manifest file.
10. The satellite-to-ground cooperative transmission system according to claim 6, wherein said satellite network operator comprises a satellite gateway, a satellite terminal, a network control center and a network management center;
the satellite gateway and the satellite terminal are interconnected through one or more channels of the satellite, and one satellite gateway provides access to the satellite terminal groups of different logic groups;
the network control center provides real-time control of the satellite network and the network management center is used to manage the system elements of the satellite network.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210991680.2A CN115361591A (en) | 2022-08-18 | 2022-08-18 | File transmission method based on 5G SBA and satellite-ground cooperative transmission system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210991680.2A CN115361591A (en) | 2022-08-18 | 2022-08-18 | File transmission method based on 5G SBA and satellite-ground cooperative transmission system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115361591A true CN115361591A (en) | 2022-11-18 |
Family
ID=84003005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210991680.2A Pending CN115361591A (en) | 2022-08-18 | 2022-08-18 | File transmission method based on 5G SBA and satellite-ground cooperative transmission system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115361591A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116055481A (en) * | 2023-04-03 | 2023-05-02 | 银河航天(北京)网络技术有限公司 | Method, system, device and storage medium for sharing files |
| CN116366535A (en) * | 2023-03-24 | 2023-06-30 | 展讯通信（上海）有限公司 | TCP-based data link aggregation method and device, readable storage medium and terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170188054A1 (en) * | 2015-12-29 | 2017-06-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for optimized media delivery |
| CN108449633A (en) * | 2018-03-22 | 2018-08-24 | 烽火通信科技股份有限公司 | Set-top box cloud frame based on NFV and service implementation method |
| CN110266664A (en) * | 2019-06-05 | 2019-09-20 | 中国联合网络通信有限公司广州市分公司 | A kind of Cloud VR video living transmission system based on 5G and MEC |
-
2022
- 2022-08-18 CN CN202210991680.2A patent/CN115361591A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170188054A1 (en) * | 2015-12-29 | 2017-06-29 | Telefonaktiebolaget Lm Ericsson (Publ) | Method and system for optimized media delivery |
| CN108449633A (en) * | 2018-03-22 | 2018-08-24 | 烽火通信科技股份有限公司 | Set-top box cloud frame based on NFV and service implementation method |
| CN110266664A (en) * | 2019-06-05 | 2019-09-20 | 中国联合网络通信有限公司广州市分公司 | A kind of Cloud VR video living transmission system based on 5G and MEC |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116366535A (en) * | 2023-03-24 | 2023-06-30 | 展讯通信（上海）有限公司 | TCP-based data link aggregation method and device, readable storage medium and terminal |
| CN116055481A (en) * | 2023-04-03 | 2023-05-02 | 银河航天(北京)网络技术有限公司 | Method, system, device and storage medium for sharing files |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US10349462B2 (en) | Methods and systems for managing bonded communications across multiple communication networks | |
| US10999215B2 (en) | Software-defined network-based method and system for implementing content distribution network | |
| EP3818684B1 (en) | Base station architecture integrating satellite-based content delivery with 4g/lte mobile network | |
| CN115361591A (en) | File transmission method based on 5G SBA and satellite-ground cooperative transmission system | |
| KR102002676B1 (en) | Client/server signaling commands for dash | |
| CN110896553B (en) | Multi-access edge computing method and platform and communication system | |
| US20110007693A1 (en) | Multipath video streaming over a wireless network | |
| CN113190495B (en) | System and method for content retrieval from remote network areas | |
| JP2017518660A (en) | Distribution method and distribution apparatus | |
| US20170048558A1 (en) | Controlling the Transmission of a Video Data Stream over a Network to a Network User Device | |
| CN109156044B (en) | Programmable system architecture for routing data packets in virtual base stations | |
| US9661550B2 (en) | Communication apparatus, communication method, and communication system | |
| Hodroj et al. | A survey on video streaming in multipath and multihomed overlay networks | |
| CN113068204B (en) | 5G core network system and method supporting PDN link optimization | |
| Odarchenko et al. | Multilink approach for the content delivery in 5G networks | |
| CN112673605B (en) | Method, apparatus and computer program for dynamic multi-endpoint generation | |
| Sathiaseelan et al. | Internet on the move: challenges and solutions | |
| Wang et al. | GENI cinema: An SDN-assisted scalable live video streaming service | |
| KR20230139683A (en) | Method and appratus to process application data in wireless communication system | |
| US20230032024A1 (en) | System and methods for providing integrated 5g and satellite service in backhaul and edge computing applications | |
| Watts et al. | 5G resilient backhaul using integrated satellite networks | |
| Singh et al. | Nexgen s-mptcp: Next generation smart multipath tcp controller | |
| Silva et al. | Mobility-optimized dynamic content placement for fast vehicles in 5G networks | |
| Bronzino et al. | In-network compute extensions for rate-adaptive content delivery in mobile networks | |
| Niephaus et al. | WiBACK: A Back-haul network architecture for 5G networks |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |