CN110650165A - Content distribution method and system based on user plane agent - Google Patents

Content distribution method and system based on user plane agent Download PDF

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Publication number
CN110650165A
CN110650165A CN201810673182.7A CN201810673182A CN110650165A CN 110650165 A CN110650165 A CN 110650165A CN 201810673182 A CN201810673182 A CN 201810673182A CN 110650165 A CN110650165 A CN 110650165A
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content
edge
mcdn
upf
user plane
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CN110650165B (en
Inventor
刘洁
林奕琳
程淑荣
张岚
黎眀雪
王庆扬
熊尚坤
曹磊
王波
赵晔
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China Telecom Corp Ltd
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China Telecom Corp Ltd
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    • 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
    • H04L67/50—Network services
    • H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
    • H04L67/63—Routing a service request depending on the request content or context
    • 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
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
    • 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
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/563—Data redirection of data network streams

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Information Transfer Between Computers (AREA)

Abstract

The invention provides a content distribution method and a system based on a user plane agent, wherein the method comprises the following steps: the MCDN edge nodes are arranged on the MEC platform, the content center judges whether the MCDN edge nodes adjacent to the terminal store accessed content, if yes, the content center initiates a user surface reselection request, a user surface path of the terminal accessing the MCDN edge nodes through an edge UPF is established, if not, the content center initiates a content agent request, the content is guided to the MCDN edge nodes, and the MEC platform copies and stores the content in the MCDN edge nodes. The content distribution method and the system based on the user plane agent utilize a flexible user plane selection mechanism of a 5G mobile network and a deployment environment of edge calculation, realize the distribution of content to edge nodes and the distribution of the traditional MCDN private network, and solve the problem of inconsistent content scheduling and addressing.

Description

Content distribution method and system based on user plane agent
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a content distribution method and system based on a user plane agent.
Background
MCDN (Mobile Content Distribution Network) is a Content service mechanism for Mobile users, and its implementation principle is similar to CDN of fixed Network: the distribution process of the content from the central point to the edge nodes is realized by building and renting an MCDN private network; the mobile user accesses the content service, and the edge node pushes the content from the central node through the MCDN private network when the edge node has no content. The existing MCDN realizes content distribution and provides content service through different networks, and has the main problems that: with the development of mobile videos, the construction pressure of MCDN private networks is increasing; there may be a case where the MCDN private network content scheduling policy and the mobile network user plane routing policy are not consistent.
Disclosure of Invention
One or more embodiments of the present invention provide a method and system for content distribution based on a user plane agent.
According to an aspect of the present disclosure, there is provided a content distribution method based on a user plane agent, including: the content center receives a content access request of a terminal, and judges whether a mobile content distribution network MCDN edge node adjacent to the terminal stores content corresponding to the content access request; the MCDN edge node is arranged on a multi-access edge computing MEC platform; if yes, the content center initiates a user plane reselection request to establish a user plane path for the terminal to access the MCDN edge node through an edge user plane functional entity (UPF); if not, the content center initiates a content agent request to enable the edge UPF to guide the content to the MCDN edge node of the MEC platform, and the MEC platform copies and stores the content in the MCDN edge node to redirect the network element providing the content to the MCDN edge node.
Optionally, the content center receives the content access request sent by the terminal through an initial user plane; the content center obtains terminal position information corresponding to the terminal from a network open function (NEF); and the content center determines the MCDN edge node adjacent to the terminal based on the terminal position information.
Optionally, the initiating, by the content center, a content proxy request includes: if the MCDN edge node is determined not to store the content, the content center determines whether the content needs to be sent to the MCDN edge node according to a preset service strategy, and if so, the content center initiates the content agency request to the NEF.
Optionally, said directing the content to the MCDN edge node comprises: and the edge UPF guides the data flow corresponding to the content to the MCDN edge node according to the content agency rule so that the MCDN edge node stores the content.
Optionally, the information carried by the content proxy request includes: the region information and the content information of the MCDN edge node are located; the method further comprises the following steps: if the NEF determines that the content center orders the agent service, the NEF forwards the content agent request to a Policy Control Function (PCF); the PCF builds the content agent rule corresponding to the content agent request and sends the content agent rule to a Session Management Function (SMF); and the SMF sends the content proxy rule to the edge UPF.
Optionally, the sending, by the SMF, the content proxy rule to the edge UPF includes: the SMF judges whether the user plane of the content center accessed by the terminal comprises the edge UPF; if not, the SMF modifies the user plane to insert the edge UPF in the user plane; after inserting the edge UPF, the SMF sends the content broker rule to the edge UPF, wherein the content broker rule comprises: and the region information where the MCDN edge node is located and the content information.
Optionally, the directing, by the edge UPF, the data flow corresponding to the content to the MCDN edge node according to a content proxy rule includes: when the edge UPF detects the content provided for the terminal, guiding a data stream corresponding to the content to the MEC platform according to the content proxy rule so that the MEC platform processes the data stream and copies the content on the MCDN edge node; and the MEC platform reconstructs the data stream corresponding to the content, forwards the data stream to the edge UPF, and sends the data stream to the terminal by the edge UPF.
Optionally, the MEC platform sends the copy result of the content to the edge UPF; and the edge UPF sends the replication result to the content center along a reverse path issued by the content agency rule.
According to another aspect of the present disclosure, there is provided a user plane agent-based content distribution system, including: the method comprises the following steps that a content center, a mobile content distribution network MCDN edge node, a multi-access edge computing MEC platform and an edge user plane function UPF; the MCDN edge node is arranged on a multi-access edge computing MEC platform; the content center is used for receiving a content access request of a terminal and judging whether MCDN edge nodes adjacent to the terminal store content corresponding to the content access request; if yes, initiating a user plane reselection request to establish a user plane path for the terminal to access the MCDN edge node through the edge UPF; if not, the content center initiates a content agent request to enable the edge UPF to guide the content to the MCDN edge node of the MEC platform, and the MEC platform copies and stores the content in the MCDN edge node to redirect the network element providing the content to the MCDN edge node.
Optionally, comprising: a network open function NEF; the content center is configured to receive the content access request sent by the terminal through an initial user plane, obtain terminal location information corresponding to the terminal from the NEF, and determine the MCDN edge node adjacent to the terminal based on the terminal location information.
Optionally, the content center is configured to determine, according to a preset service policy, whether the content needs to be delivered to the MCDN edge node if it is determined that the MCDN edge node does not store the content, and if so, initiate the content broker request to the NEF.
Optionally, the edge UPF is configured to direct a data stream corresponding to the content to the MCDN edge node according to a content proxy rule, so that the MCDN edge node stores the content.
Optionally, comprising: a policy control function PCF and a session management function SMF; wherein, the information carried by the content agent request comprises: the area information area name and the content information of the MCDN edge node; the NEF is used for forwarding the content agent request to the PCF if the content center is determined to subscribe to the agent service; the PCF is used for constructing the content agent rule corresponding to the content agent request and sending the content agent rule to the SMF; and the SMF is used for sending the content proxy rule to the edge UPF.
Optionally, the SMF is configured to determine whether a user plane of the content center accessed by the terminal includes the edge UPF; if not, modifying the user plane to insert the edge UPF in the user plane; after inserting the edge UPF, sending the content proxy rule to the edge UPF; wherein the content broker rules include: and the region information where the MCDN edge node is located and the content information.
Optionally, the edge UPF is configured to, when the content provided for the terminal is detected, direct a data stream corresponding to the content to the MEC platform according to the content proxy rule, so that the MEC platform processes the data stream and copies the content on the MCDN edge node; and the MEC platform reconstructs the data stream corresponding to the content, forwards the data stream to the edge UPF, and sends the data stream to the terminal by the edge UPF.
Optionally, the MEC platform is configured to send a copy result of the content to the edge UPF; and the edge UPF is used for sending the replication result to the content center along a reverse path issued by the content agency rule.
According to still another aspect of the present disclosure, there is provided a user plane agent-based content distribution system including: a memory; and a processor coupled to the memory, the processor configured to perform the user plane agent based content distribution method described above based on instructions stored in the memory.
According to yet another aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon computer program instructions which, when executed by one or more processors, implement the steps of the method as described above.
The content distribution method and the system based on the user plane agent utilize a flexible user plane selection mechanism of a 5G mobile network and a deployment environment of edge calculation, a content center realizes the distribution of content to edge nodes while providing content service through the mobile network, realizes the distribution of the traditional MCDN private network, and reduces the flow pressure of the MCDN private network; the content center can flexibly decide a distribution strategy according to the content characteristics and send the distribution strategy to the mobile network; the change of the content center scheduling strategy does not need to change the configuration of the DNS, and the problem of inconsistency of content scheduling and addressing is solved.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without inventive exercise.
FIG. 1 is a schematic flow chart diagram illustrating one embodiment of a user plane agent based content distribution method according to the present disclosure;
FIG. 2 is a schematic flow chart diagram illustrating another embodiment of a user plane agent based content distribution method according to the present disclosure;
fig. 3 is a schematic flow diagram of copying content to MCDN edge nodes on an MEC platform according to yet another embodiment of a user plane agent based content distribution method of the present disclosure;
FIG. 4 is a block diagram representation of one embodiment of a user plane agent based content distribution system according to the present disclosure;
FIG. 5 is a block diagram representation of another embodiment of a user plane agent based content distribution system according to the present disclosure;
fig. 6 is a block diagram of yet another embodiment of a user plane agent based content distribution system according to the present disclosure.
Detailed Description
The present disclosure now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the disclosure are shown. The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
Fig. 1 is a schematic flow chart of an embodiment of a content distribution method based on a user plane agent according to the present disclosure, as shown in fig. 1:
step 101, a content center receives a content access request of a terminal, and judges whether a mobile content distribution network MCDN edge node adjacent to the terminal stores content corresponding to the content access request. The MCDN Edge node is arranged on a Multi-access Edge Computing MEC (Multi-access Edge Computing) platform, and the content center may be an MCDN content center or the like.
Step 102, if yes, the content center initiates a user Plane reselection request to establish a user Plane path for the terminal to access the MCDN edge node through an edge user Plane function (upf). The user plane may be established by a user plane protocol of the 5G network.
Step 103, if not, the content center initiates a content proxy request to enable the edge UPF to guide the content to the MEC platform, and the MEC platform copies and stores the content in the MCDN edge node to redirect the network element providing the content to the MCDN edge node. The content can be audio, video and other data, is guided to the MEC platform and is stored on the MCDN edge node, and provides a content proxy service.
The content distribution method based on the user plane agent in the embodiment realizes the distribution of the content from the center to the edge in the process of providing the content service by the mobile network, improves the network utilization rate and the flexibility of content center decision, and can ensure the consistency of content scheduling and addressing at the same time.
In one embodiment, a content center receives a content access request sent by a terminal through an initial user plane, obtains terminal position information corresponding to the terminal from a network open function (nef) (network Exposure function), and determines an MCDN edge node adjacent to the terminal based on the terminal position information. And if the content center determines that the MCDN edge node does not store the content, determining whether the content needs to be sent to the MCDN edge node according to a preset service strategy.
And if the content is determined to need to be sent to the MCDN edge node, the content center initiates a content agent request to the NEF. The service policy may include various policies, for example, including issuing audio and video data to the MCDN edge node, and providing audio and video data proxy to the terminal by the MCDN edge node. And the edge UPF guides the data flow corresponding to the content to the MCDN edge node according to the content agency rule so that the MCDN edge node provides the content for the terminal.
In one embodiment, based on a 5G mobile network and the MCDN edge nodes are deployed on the MEC platform, the address resolution of the mobile terminal when accessing the content service points to the content center. The content center triggers the user plane to reselect to the MEC platform under the condition that the MCDN edge node has the related content, otherwise, whether the content is distributed to the MCDN edge node is determined according to the strategy, and if the content is needed, a request for guiding the user plane content is initiated to the 5G mobile network.
The information carried by the content agent request includes service Area information (e.g. local Area Data network) where the MCDN edge node is located, content information, and the like, and the content information is a characteristic value capable of identifying content, such as a source IP, a port, a protocol, a content ID, and the like. If the NEF determines that the content center has subscribed to the proxy service, the content proxy request is forwarded to the policy Control function pcf (policy Control function). PCF builds content proxy rule corresponding to content proxy request, and sends the content proxy rule to Session management function SMF (Session)
Management Function), the SMF sends the content broker rule to the edge UPF. In the process of providing content services by the content center, the edge UPF executes content proxy rules to direct and copy content to the MCDN edge node of the MEC.
The SMF judges whether the user plane of the content center accessed by the terminal comprises the edge UPF or not, if not, the SMF modifies the user plane to insert the edge UPF in the user plane, and after the edge UPF is inserted, the SMF sends the content agent rule to the edge UPF. The content proxy rule includes various information, such as conditions for triggering proxy operation, and information of the area and content where the MCDN edge node is located. And when the edge UPF detects the content serving for the terminal, guiding the data stream corresponding to the content to the MEC platform according to the content proxy rule so that the MEC platform processes the data stream and copies the content on the MCDN edge node. And the MEC platform sends the copying result of the content to the edge UPF, and the edge UPF sends the copying result to the content center along a reverse path issued by the content agency rule.
Fig. 2 is a schematic flow chart of another embodiment of the content distribution method based on the user plane agent according to the present disclosure, as shown in fig. 2:
step 201, setting the MCDN edge node on the MEC platform.
In step 202, the terminal requests access to a content service.
In step 203, the DNS server resolves the access request and the address to the content center. When the mobile user accesses the content service, the access request is resolved to the content center through the DNS.
Step 204, the content center judges whether the MCDN edge node stores the content requested to be accessed by the terminal according to the terminal position, that is, judges whether the MCDN edge node adjacent to the user already has the content that the user needs to access, if yes, step 205 is entered, and if not, step 207 is entered.
In step 205, the content center triggers the user plane to reselect to the edge UPF. The content center, as an af (application function) role in the network architecture, initiates a request for user plane reselection to the 5G core network through the NEF, and the core network implements the user plane reselection to establish a user plane path for the user to access an edge node on the MEC through the edge UPF.
And step 206, the MCDN edge node provides the content service for the terminal, thereby realizing the service provided for the user by the MCDN edge node.
Step 207, whether the content center issues the content to the MCDN edge node. The content center may determine whether to deliver the content required by the user to the edge node adjacent to the user according to the service policy decision customized by the content provider itself, and if so, go to step 208.
If not, step 208' is entered, and the content center provides the service directly to the user, the service process does not need to implement content distribution at the same time.
Step 208, the content center initiates the content agent request. The content center may initiate a proxy request to the network through the NEF.
In step 209, the PCF issues a content broker rule to the UFP and SMF. The agent request is authorized by NEF and then forwarded to PCF (policy control function), PCF sends content agent rule to policy executor UPF through SMF.
The data stream of the content service provided by the content center goes through the edge UPF, step 210.
In step 211, the UFP executes the content brokering rules to direct the content to the MEC platform. In the process of providing content service by the content center, if the edge UPF detects the content service data stream which needs to be subjected to proxy forwarding, the edge UPF executes the previously issued content proxy rule and guides the data stream to the MEC platform.
At step 212, the MEC platform copies the content to the MCDN edge node. The content may be audio, video data, etc., and the format may be an RTP stream encapsulated with GTP packets, etc. The MEC platform can open and seal GTP (GPRS tunnel protocol) packets, further analyze RTP (real-time transport protocol) data packets, copy and store the content on the MCDN edge nodes of the content,
in step 213, the content center is notified of the content duplication result. After the copying is finished, the MEC platform informs the edge UPF, and the edge UPF informs the content center of the copying result along a reverse path issued by the content agency rule.
In step 213', the MEC platform reconstructs the user content data packet and forwards it to the user via the edge UPF.
Fig. 3 is a schematic flowchart of a process of copying content to an MCDN edge node on an MEC platform according to another embodiment of the content distribution method based on a user plane agent according to the present disclosure, as shown in fig. 3:
in step 301, an end user accesses a content center through an initial user plane.
The content center (AF) obtains the location information of the end-users it subscribes to the network from the NEF, step 302.
And step 303, the content center judges that no content required by the terminal exists on the MCDN edge node adjacent to the terminal user, and determines that the content is required to be sent to the MCDN edge node according to the service strategy.
Step 304, the content center sends a content agent request to the NEF, where the content agent request carries the area information where the MCDN edge node is located and the application/content information.
Step 305, NEF authenticates the content center, and if it is known that the content center has subscribed the service content proxy service, forwards the proxy request to PCF.
Step 306, the PCF constructs a content agent rule according to the service policy and the content agent request, and sends the content agent rule to the SMF.
In step 307, the SMF determines whether the user plane of the content center accessed by the terminal already includes an edge UPF corresponding to the MCDN edge node.
If the user plane does not include an edge UPF, the SMF modifies the user plane and inserts the edge UPF, step 308.
Step 309, the SMF issues the content agent rule to the edge UPF, where the content agent rule includes the application/content information of the agent to be implemented.
In step 310, the content data stream first reaches the edge UPF in the process of providing the service by the content center.
At step 311, the edge UPF detects that the service content needs to be forwarded by the MEC platform agent.
In step 312, the edge UPF directs the data stream to the MEC platform, where the data stream is a GTP-encapsulated media data stream, and so on.
And 313, the MEC platform unwraps the GTP data flow, extracts and stores the content on the MCDN edge node, and then recovers or reconstructs the GTP data flow.
And step 314, the MEC platform forwards the GTP data stream to the UPF, and further sends the GTP data stream to the user UE.
In step 315, the MEC platform notifies the corresponding edge UPF of the result of the content copy.
In step 316, the edge UPF notifies the content center (AF) of the copy result via the reverse path issued by the policy.
As shown in fig. 4, in one embodiment, the present disclosure provides a user plane agent based content distribution system comprising: a content center 41, a mobile content distribution network MCDN edge node 42, a multi-access edge computing MEC platform 43 and an edge user plane function entity UPF 44. The MCDN edge node 42 is disposed on a multiple access edge computation MEC platform 43. The content center 41 receives a content access request sent by the terminal 45, judges whether an MCDN edge node 42 adjacent to the terminal 45 stores content corresponding to the content access request, if yes, initiates a user plane reselection request to establish a user plane path for the terminal 45 to access the MCDN edge node 42 through an edge UPF44, and if not, the content center 41 initiates a content proxy request to enable the edge UPF44 to guide the content to the MEC platform 43, and the MEC platform 43 copies and stores the content in the MCDN edge node 42 to redirect a network element providing the content to the MCDN edge node 42.
As shown in fig. 5, the user plane agent-based content distribution system further includes: upf (psa)46, SMF47, PCF48, and NEF 49. The content center 41 receives a content access request sent by the terminal through the initial user plane, obtains terminal location information corresponding to the terminal from NEF49, and determines an MCDN edge node 42 adjacent to the terminal based on the terminal location information.
If the content center 41 determines that the MCDN edge node 42 does not store the content, it determines whether the content needs to be sent to the MCDN edge node 42 according to a preset service policy, and if so, it initiates a content proxy request to NEF 49. Edge UPF44 directs data flows corresponding to content to MCDN edge node 42 in accordance with content brokering rules to cause MCDN edge node 42 to provide content to terminal 45.
The information carried by the content agent request comprises the area information where the MCDN edge node is located and the content information. NEF49 forwards the content proxy request to PCF48 if it determines that content center 41 has subscribed to the service proxy service. The PCF48 builds content proxy rules corresponding to the content proxy request and sends the content proxy rules to the SMF 47. The SMF47 sends the content proxy rules to the edge UPF 44.
The SMF47 determines whether the user plane of the content center 41 accessed by the terminal 45 includes an edge UPF44 and, if not, modifies the user plane to insert an edge UPF44 in the user plane. After inserting the edge UPF44, the content proxy rules are sent to the edge UPF 44. The content proxy rule includes the area information and content information where the MCDN edge node 42 is located, and the like.
When detecting that the terminal 45 needs to be provided with the content, the edge UPF44 directs the data stream corresponding to the content to the MEC platform 43 according to the content proxy rule, so that the MEC platform 43 processes the data stream and copies the content on the MCDN edge node 42. The MEC platform 43 reconstructs the data stream corresponding to the content and forwards it to the edge UPF44 for transmission by the edge UPF44 to the terminal. The MEC platform 43 sends the replication result of the content to the edge UPF44, and the edge UPF44 sends the replication result to the content center 41 along the reverse path issued by the content agent rule.
Fig. 6 is a block diagram of another embodiment of a user plane agent based content distribution system according to the present disclosure. As shown in fig. 6, the apparatus may include a memory 61, a processor 62, a communication interface 63, and a bus 64. The memory 61 is used for storing instructions, the processor 62 is coupled to the memory 61, and the processor 62 is configured to execute the content distribution method based on the user plane agent based on the instructions stored in the memory 61.
The memory 61 may be a high-speed RAM memory, a nonvolatile memory (NoN-volatile memory), or the like, and the memory 61 may be a memory array. The storage 61 may also be partitioned and the blocks may be combined into virtual volumes according to certain rules. The processor 62 may be a central processing unit CPU, or an application specific integrated circuit asic, or one or more integrated circuits configured to implement the user plane agent based content distribution method disclosed herein.
In one embodiment, the present disclosure also provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, which when executed by a processor, implement the user plane agent-based content distribution method according to any of the above embodiments.
As will be appreciated by one skilled in the art, embodiments of the present disclosure may be provided as a method, apparatus, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present disclosure may take the form of a computer program product embodied on one or more computer-usable non-transitory storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
In the content distribution method and system based on the user plane agent provided in the above embodiments, the MCDN edge node is set on the MEC platform, and the content center determines whether the MCDN edge node adjacent to the terminal stores the accessed content, if yes, the content center initiates a user plane reselection request, establishes a user plane path through UPF for the terminal to access the MCDN edge node, and if not, the content center initiates a content agent request, and directs the content to the MCDN edge node, so that the MCDN edge node provides the content for the terminal; by utilizing a flexible user plane selection mechanism of a 5G mobile network and a deployment environment of edge calculation, the content center realizes distribution of content to edge nodes while providing content service through the mobile network, realizes distribution of a traditional MCDN private network, and reduces the flow pressure of the MCDN private network; the content center can flexibly decide a distribution strategy according to the content characteristics and send the distribution strategy to the mobile network; the change of the content center scheduling strategy does not need to change the configuration of the DNS, and the problem of inconsistency of content scheduling and addressing is solved.
The method and system of the present disclosure may be implemented in a number of ways. For example, the methods and systems of the present disclosure may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order for the steps of the method is for illustration only, and the steps of the method of the present disclosure are not limited to the order specifically described above unless specifically stated otherwise. Further, in some embodiments, the present disclosure may also be embodied as programs recorded in a recording medium, the programs including machine-readable instructions for implementing the methods according to the present disclosure. Thus, the present disclosure also covers a recording medium storing a program for executing the method according to the present disclosure.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.

Claims (18)

1. A content distribution method based on a user plane agent comprises the following steps:
the content center receives a content access request of a terminal, and judges whether a mobile content distribution network MCDN edge node adjacent to the terminal stores content corresponding to the content access request; the MCDN edge node is arranged on a multi-access edge computing MEC platform;
if yes, the content center initiates a user plane reselection request to establish a user plane path for the terminal to access the MCDN edge node through an edge User Plane Function (UPF);
if not, the content center initiates a content agent request to enable the edge UPF to guide the content to the MEC platform, and the MEC platform copies and stores the content in the MCDN edge node to redirect the network element providing the content to the MCDN edge node.
2. The method of claim 1, further comprising:
the content center receives the content access request sent by the terminal through an initial user plane;
the content center obtains terminal position information corresponding to the terminal from a network open function (NEF);
and the content center determines the MCDN edge node adjacent to the terminal based on the terminal position information.
3. The method of claim 2, the content center initiating a content proxy request comprising:
if the MCDN edge node is determined not to store the content, the content center determines whether the content needs to be sent to the MCDN edge node according to a preset service strategy, and if so, the content center initiates the content agency request to the NEF.
4. The method of claim 3, the edge UPF directing the content to the MCDN edge node comprising:
and the edge UPF guides the data flow corresponding to the content to the MCDN edge node according to the content agency rule so that the MCDN edge node stores the content.
5. The method of claim 4, wherein the content agent request carries information comprising: the region information and the content information of the MCDN edge node are located; the method further comprises the following steps:
if the NEF determines that the content center orders the agent service, the NEF forwards the content agent request to a Policy Control Function (PCF);
the PCF builds the content agent rule corresponding to the content agent request and sends the content agent rule to a Session Management Function (SMF);
and the SMF sends the content proxy rule to the edge UPF.
6. The method of claim 5, the SMF sending the content broker rule to the edge UPF comprising:
the SMF judges whether the user plane of the content center accessed by the terminal comprises the edge UPF;
if not, the SMF modifies the user plane to insert the edge UPF in the user plane;
after inserting the edge UPF, the SMF sends the content broker rule to the edge UPF, wherein the content broker rule comprises: and the region information where the MCDN edge node is located and the content information.
7. The method of claim 4, the edge UPF directing data flows corresponding to the content to the MCDN edge node according to content brokering rules comprising:
when the edge UPF detects that the content needs to be forwarded for the terminal agent, guiding a data stream corresponding to the content to the MEC platform according to the content agent rule so that the MEC platform processes the data stream and copies the content on the MCDN edge node;
and the MEC platform reconstructs the data stream corresponding to the content, forwards the data stream to the edge UPF, and sends the data stream to the terminal by the edge UPF.
8. The method of claim 7, further comprising:
the MEC platform sends the copying result of the content to the edge UPF;
and the edge UPF sends the replication result to the content center along a reverse path issued by the content agency rule.
9. A user plane agent based content distribution system comprising:
the method comprises the following steps that a content center, a mobile content distribution network MCDN edge node, a multi-access edge computing MEC platform and an edge user plane function UPF; the MCDN edge node is arranged on a multi-access edge computing MEC platform;
the content center is used for receiving a content access request of a terminal and judging whether MCDN edge nodes adjacent to the terminal store content corresponding to the content access request; if yes, initiating a user plane reselection request to establish a user plane path for the terminal to access the MCDN edge node through the edge UPF; if not, initiating a content proxy request to enable the edge UPF to guide the content to the MCDN edge node of the MEC platform, and enabling the MEC platform to copy and store the content in the MCDN edge node so as to redirect the network element providing the content to the MCDN edge node.
10. The system of claim 9, comprising: a network open function NEF;
the content center is configured to receive the content access request sent by the terminal through an initial user plane, obtain terminal location information corresponding to the terminal from the NEF, and determine the MCDN edge node adjacent to the terminal based on the terminal location information.
11. The system of claim 10, wherein,
and the content center is used for determining whether the content needs to be sent to the MCDN edge node according to a preset service strategy if the MCDN edge node does not store the content, and if so, initiating the content agency request to the NEF.
12. The system of claim 11, wherein,
and the edge UPF is used for guiding the data flow corresponding to the content to the MCDN edge node according to a content agency rule so as to enable the MCDN edge node to store the content.
13. The system of claim 12, comprising: a policy control function PCF and a session management function SMF; wherein, the information carried by the content agent request comprises: the region information and the content information of the MCDN edge node are located;
the NEF is used for forwarding the content agent request to the PCF if the content center is determined to subscribe to the agent service;
the PCF is used for constructing the content agent rule corresponding to the content agent request and sending the content agent rule to the SMF;
and the SMF is used for sending the content proxy rule to the edge UPF.
14. The system of claim 13, wherein,
the SMF is used for judging whether the user plane of the content center accessed by the terminal comprises the edge UPF; if not, modifying the user plane to insert the edge UPF in the user plane; after inserting the edge UPF, sending the content proxy rule to the edge UPF;
wherein the content broker rules include: and the region information where the MCDN edge node is located and the content information.
15. The system of claim 12, wherein,
the edge UPF is configured to, when it is detected that the content needs to be provided for the terminal, direct a data stream corresponding to the content to the MEC platform according to the content proxy rule, so that the MEC platform processes the data stream, and copies the content on the MCDN edge node;
and the MEC platform reconstructs the data stream corresponding to the content, forwards the data stream to the edge UPF, and sends the data stream to the terminal by the edge UPF.
16. The system of claim 15, wherein,
the MEC platform is used for sending the copying result of the content to the edge UPF;
and the edge UPF is used for sending the replication result to the content center along a reverse path issued by the content agency rule.
17. A user plane agent based content distribution system comprising:
a memory; and a processor coupled to the memory, the processor configured to perform the method of any of claims 1-8 based on instructions stored in the memory.
18. A computer readable storage medium having stored thereon computer program instructions which, when executed by one or more processors, implement the steps of the method of any one of claims 1 to 8.
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