CN110582090A - CDN scheduling method, scheduling system and MEC network element - Google Patents
CDN scheduling method, scheduling system and MEC network element Download PDFInfo
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Abstract
The invention discloses a CDN scheduling method, a scheduling system and an MEC network element, and relates to the technical field of content delivery networks. The method is suitable for a 5G network architecture and comprises the following steps: an access network edge layer MEC network element receives a trigger request sent by an access network center layer UPF network element; the access network edge layer MEC network element receives the data request sent by the access network center layer UPF network element and forwards the data request to the target CDN node; and the access network edge layer MEC network element sends a response request returned by the target CDN node to a corresponding client. The invention can realize CDN scheduling under a 5G scene, effectively distribute service content, enable a user to acquire data from a nearest CDN node and reduce the time delay of acquiring information by the user.
Description
Technical Field
the invention relates to the technical field of content delivery networks, in particular to a CDN scheduling method, a scheduling system and an MEC network element.
Background
the CDN (Content Distribution Network) technology is to place node Network elements at various places of a Network, so as to form a layer of intelligent virtual Network architecture based on the existing internet. Through the CDN technology, the content of the website can be delivered to the "edge" of the network closest to the user, so that the user can obtain the required content nearby. In the recent MEC (Mobile Edge Computing) architecture, the connection between the end user and the CDN node is transferred by an MEC network element, and since the MEC network element is closer to the user than an EPC (Evolved packet core, core network element), the delay when the user accesses the service to the CDN node may also be lower.
However, with the gradual popularization of 5G (5th generation mobile networks) networks, a large number of terminal devices will be accessed to the 5G networks, resulting in a rapid increase in services such as audio, video, and image facing users, and network traffic will exhibit an explosive increase, thereby greatly affecting the quality of service for users to access the internet.
therefore, how to perform CDN scheduling in a 5G scenario to effectively deliver large-traffic service content enables a user to obtain data from a nearest CDN node, thereby reducing a time delay for the user to obtain information, which becomes a big problem for network operators and content providers.
disclosure of Invention
in order to solve the problems in the prior art, embodiments of the present invention provide a CDN scheduling method, a scheduling system, and an MEC network element. The technical scheme is as follows:
in a first aspect, a CDN scheduling method is provided, where the method is applied to a 5G network architecture, and includes:
An access network edge layer MEC network element receives a trigger request sent by an access network center layer UPF network element;
The access network edge layer MEC network element receives the data request sent by the access network center layer UPF network element and forwards the data request to the target CDN node;
And the access network edge layer MEC network element sends a response request returned by the target CDN node to a corresponding client.
Further, after the receiving, by the access network edge layer MEC network element, the trigger request sent by the access network center layer UPF network element, the method further includes:
And the access network edge layer MEC network element locally configures an UL classifier according to the trigger request, wherein the UL classifier can filter the data request according to the destination IP of the data request.
Further, the method further comprises:
the access network edge layer MEC network element receives a data request sent by the client;
The access network edge layer MEC network element filters the data request through the UL classifier;
And the access network edge layer MEC network element forwards the data request according to the filtering result.
further, the forwarding, by the access network edge layer MEC network element, the data request according to the filtering result includes:
if the target IP of the data request is a target CDN node IP, the access network edge layer MEC network element sends the data request to the target CDN node;
and if the destination IP of the data request is not the target CDN node IP, the access network edge layer MEC network element sends the data request to the access network central layer UPF network element.
further, the triggering request is sent to the access network edge layer MEC network element by the access network center layer UPF network element after the access network center layer UPF network element receives a data request for a target CDN node.
Further, the destination IP of the data request for the target CDN node is the target CDN node IP.
Further, before the receiving, by the access network edge layer MEC network element, the trigger request sent by the access network center layer UPF network element, the method further includes:
The UPF network element of the access network central layer receives the data request sent by the client and determines the target IP of the data request; and if the target IP is the target CDN node IP, sending a trigger request to the access network edge layer MEC network element.
Further, before the receiving, by the UPF network element of the central layer of the access network, the data request sent by the client, the method further includes:
the access network central layer UPF network element receives a DNS analysis request of the client to a target domain name and forwards the DNS analysis request to a corresponding DNS analysis server;
The access network central layer UPF network element receives a DNS analysis result of the target domain name, wherein the DNS analysis result is the target CDN node IP;
and the UPF network element of the access network center layer returns the DNS analysis result of the target domain name to the client, so that the client takes the target CDN node IP as a target IP in a subsequent data request of the target domain name.
in a second aspect, the method is applicable to a 5G network architecture, and the CDN scheduling system includes an access network center layer UPF network element and an access network edge layer MEC network element, where the access network edge layer MEC network element is configured to execute the CDN scheduling method in the first aspect;
the access network central layer UPF network element is used for receiving a data request sent by a client and determining a target IP of the data request; and if the target IP is the target CDN node IP, sending a triggering request and the data request to an access network edge layer MEC network element.
In a third aspect, a CDN scheduling method is provided, where the method is applied to a 5G network architecture, and includes:
an access network center layer UPF network element receives a data request of a client aiming at a target CDN node;
The access network center layer UPF network element sends a triggering request to an access network edge layer MEC network element;
and the access network center layer UPF network element sends the data request to the access network edge layer MEC network element.
further, before the receiving, by the access network center layer UPF network element, a data request of a client for a target CDN node, the method further includes:
The access network central layer UPF network element receives a DNS analysis request of the client to a target domain name and forwards the DNS analysis request to a corresponding DNS analysis server;
The access network central layer UPF network element receives a DNS analysis result of the target domain name, wherein the DNS analysis result is a target CDN node IP;
and the UPF network element of the access network center layer returns the DNS analysis result of the target domain name to the client, so that the client takes the target CDN node IP as a target IP in a subsequent data request of the target domain name.
Further, the receiving, by the access network center layer UPF network element, a data request of a client for a target CDN node includes:
The UPF network element of the access network center layer receives the data request sent by the client and determines the destination IP of the data request;
The method for sending the triggering request to the access network edge layer MEC network element by the access network center layer UPF network element comprises the following steps:
And if the target IP of the data request is the target CDN node IP, the access network center layer UPF network element sends a trigger request to the access network edge layer MEC network element.
In a fourth aspect, an MEC network element for CDN scheduling is provided, which is applicable to an access network edge layer in a 5G network architecture, and includes:
The receiving and sending module is used for receiving a triggering request sent by a UPF network element of a central layer of an access network; receiving a data request sent by the UPF network element at the central layer of the access network, and forwarding the data request to a target CDN node; sending a response request returned by the target CDN node to a corresponding client;
A configuration module, configured to configure a UL classifier locally according to the trigger request, where the UL classifier may filter the data request according to a destination IP of the data request;
a filtering module for filtering the data request by the UL classifier.
in a fifth aspect, an MEC network element for CDN scheduling is provided, where the MEC network element includes a memory and a processor, where the memory stores at least one instruction, at least one program, a code set, or an instruction set, and the at least one instruction, the at least one program, the code set, or the instruction set is loaded and executed by the processor to implement the CDN scheduling method according to the first aspect.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
In the embodiment of the invention, an access network edge layer MEC network element receives a trigger request sent by an access network center layer UPF network element; the access network edge layer MEC network element receives the data request sent by the access network center layer UPF network element and forwards the data request to the target CDN node; and the access network edge layer MEC network element sends a response request returned by the target CDN node to a corresponding client. Therefore, by establishing a linkage mechanism between the UPF network element at the central layer of the access network and the MEC network element at the edge layer of the access network, when the UPF network element at the central layer of the access network receives a data request, the UL classifier is dynamically inserted into the MEC network element at the edge layer of the access network, so that the abnormal time sequence caused by insufficient insertion time of the UL classifier or the loss of a data packet can be avoided, the CDN scheduling under a 5G scene is realized, the service content is effectively distributed, a user can acquire data from the nearest CDN node, and the time delay of the user for acquiring the information is reduced.
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in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a CDN scheduling method according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of an MEC network element according to an embodiment of the present invention.
Detailed Description
in order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
The embodiment of the invention provides a CDN scheduling method which is suitable for a 5G network architecture. In the 5G Network, a Control Plane (Control Plane) and a User Plane (User Plane) are separated, so that a User Plane function of a Core Network (Core Network) is sunk to an Access Network (Access Network), and the Core Network retains a Control Plane function. The user plane refers to actual service data of a user, for example: voice data, video stream data, and the like; the control plane refers to signaling, commands, etc. that manage the data flow. Therefore, in the 5G network architecture, an MEC (Mobile Edge Computing) network element may be set in an access network Edge layer between a base station and an access network center layer UPF (User Plane Function) network element to provide related service. The application scenario of this embodiment may be: the client side initiates a DNS analysis request aiming at the target domain name, and obtains a target CDN node IP as an analysis result. When the client sends the data request for the target domain name again, the target CDN node IP may be used as a destination IP of the data request, and the data request is sent for the target CDN node. After receiving a data request aiming at a target CDN node sent by a client, an access network center layer UPF network element triggers an access network edge layer MEC network element, and then sends the data request to the access network edge layer MEC network element; the access network edge layer MEC network element forwards the data request to a target CDN node; after receiving a response request returned by the target CDN node, the access network edge layer MEC network element directly sends the response request to the client, so that a transmission link is established with the client. Thus, when the client continues to send the data request for the target domain name, the data request can be directly received by the access network edge layer MEC network element through the link, and the data request is forwarded by the access network edge layer MEC network element.
In the following, a detailed description will be given of a scheduling procedure of the CDN shown in fig. 1 with reference to a specific embodiment, where the content may be as follows:
Step 101: and the access network center layer UPF network element receives a data request of a client aiming at the target CDN node and sends a trigger request to the access network edge layer MEC network element.
In implementation, when a client accesses a target domain name for the first time, a DNS resolution request for the target domain name needs to be initiated. And after receiving a DNS analysis request aiming at the target domain name sent by the client, the UPF network element of the access network center layer forwards the analysis request to a corresponding DNS analysis server. And the DNS analysis server analyzes the target domain name, determines a CDN server capable of providing service for the target domain name as a target CDN server, takes the IP of the target CDN server as the IP corresponding to the target domain name, and then returns the analysis result to the UPF network element of the access network central layer. And the UPF network element of the access network central layer receives the DNS analysis result of the target domain name and returns the analysis result to the client. In this way, the client obtains the IP corresponding to the target domain name, and then, when the client sends the data request to the target domain name again, the IP corresponding to the target domain name (target CDN node IP) may be used as the destination IP of the data request to send the data request for the target CDN node.
the method comprises the steps that an MEC network element is preset in an access network edge layer, however, under a normal condition, the MEC network element of the access network edge layer does not process any data request, and the MEC network element of the access network edge layer starts to process the data request only after being triggered. The access network center layer UPF network element may receive a plurality of data requests from the same client or different clients, and the access network center layer UPF network element needs to determine whether the received data requests are for the target CDN node, so as to further trigger the access network edge MEC network element.
therefore, after receiving a data request sent by a client, an access network center layer UPF network element first determines a destination IP of the data request. If the target IP of the data request is the target CDN node IP, the data request is indicated to the target CDN node, at the moment, an access network center layer UPF network element firstly caches the data requests in the local, and meanwhile, a triggering request is sent to an access network edge layer MEC network element to trigger the access network edge layer MEC network element, so that the data request can be sent to the target CDN node through the access network edge MEC network element in the subsequent process; if the target IP of the data request is not the target CDN node IP, the data request is not specific to the target CDN node, and the data request does not need to be sent to the target CDN node, so that the access network center layer UPF network element does not send a trigger request to the access network edge layer MEC network element.
step 102: and the access network edge layer MEC network element receives a trigger request sent by the access network center layer UPF network element.
In implementation, after receiving a trigger request sent by an access network center layer UPF network element, an access network edge layer MEC network element can receive a data request and perform corresponding processing.
Optionally, in order to enable the access network edge layer MEC network element to filter the data request, the corresponding processing may be as follows: and locally configuring the UL classifier according to the trigger request. Wherein the UL classifier may filter the data request according to a destination IP of the data request.
in implementation, after receiving a trigger request sent by an access network center layer UPF network element, an access network edge layer MEC network element locally inserts an UL classifier. The UL Classifier (Uplink Classifier) may forward a data request satisfying a filtering rule in an Uplink to a specified server according to the filtering rule provided by an access network center layer SMF (session management function). In this way, in the subsequent data transmission process, after receiving the data request sent by the client, the access network edge layer MEC network element can filter and forward the data request according to the preset filtering rule through the UL classifier. Therefore, when the UPF network element at the central layer of the access network receives the data request, the mechanism for dynamically inserting the UL classifier can seamlessly deal with the change of the target CDN node and can also avoid the abnormal condition caused by the change of the target CDN node in the process of inserting the UL classifier.
step 103: and the access network center layer UPF network element sends the data request to the access network edge layer MEC network element.
In implementation, after triggering the access network edge layer MEC network element, the access network center layer UPF network element may store the data in the local, send all data requests for the target CDN node to the access network edge layer MEC network element, and deliver the data requests to the access network edge layer MEC network element for processing.
Step 104: and the access network edge layer MEC network element receives the data request sent by the access network center layer UPF network element and forwards the data request to the target CDN node.
In implementation, after the configuration of the access network edge layer MEC network element completes the UL classifier, a data request for a target CDN node sent by an access network center layer UPF network element is received, and the data request is forwarded to the target CDN node according to a destination IP of the data request.
step 105: and the access network edge layer MEC network element sends a response request returned by the target CDN node to the corresponding client.
In implementation, after receiving a data request sent by an access network edge layer MEC network element, a target CDN node returns a corresponding response request to the access network edge layer MEC network element according to the data request. And after receiving the response request, the access network edge layer MEC network element establishes a transmission link with the corresponding client and sends the response request to the client so that the client obtains the required data.
Step 106: and the access network edge layer MEC network element receives a data request sent by the client.
in implementation, after receiving a response request sent by an access network edge layer MEC network element, when the client sends a data request again, whether the data request is a data request for a target domain name or whether a target IP of the data request is a target CDN node IP, the data request is sent to the access network edge layer MEC network element through a transmission link previously established with the access network edge layer MEC network element.
Step 107: and the access network edge layer MEC network element filters the data request through the UL classifier.
in implementation, after receiving a data request sent by a client, an access network edge layer MEC network element first determines a destination IP of the data request, and then classifies and filters the data request through an UL classifier.
step 108: and the access network edge layer MEC network element forwards the data request according to the filtering result.
In the implementation, after classifying and filtering the data request through the UL classifier, the MEC network element at the edge of the access network performs corresponding forwarding processing on the data request according to the filtering result.
as described above, the UL classifier can forward the data request satisfying the filtering rule in the uplink to the specified server according to the preset filtering rule, and thus, the corresponding process may be as follows: if the target IP of the data request is the target CDN node IP, the data request is sent to the target CDN node; and if the destination IP of the data request is not the target CDN node IP, sending the data request to an access network central layer UPF network element.
In implementation, after receiving a data request sent by a client, an access network edge layer MEC network element first determines a destination IP of the data request. The UL classifier classifies and filters the data request according to the target IP, and for the data request of which the target IP is the target CDN node IP, the access network edge layer MEC network element directly sends the data request to the target CDN node; and for the data request of which the target IP is not the target CDN node IP, the access network edge layer MEC network element sends the data request to the access network central layer UPF network element, and the access network central layer UPF network element sends the data request to a corresponding server.
in the embodiment of the invention, an access network edge layer MEC network element receives a trigger request sent by an access network center layer UPF network element; the access network edge layer MEC network element receives the data request sent by the access network center layer UPF network element and forwards the data request to the target CDN node; and the access network edge layer MEC network element sends a response request returned by the target CDN node to a corresponding client. Therefore, by establishing a linkage mechanism between the UPF network element at the central layer of the access network and the MEC network element at the edge layer of the access network, when the UPF network element at the central layer of the access network receives a data request, the UL classifier is dynamically inserted into the MEC network element at the edge layer of the access network, so that the abnormal time sequence caused by insufficient insertion time of the UL classifier or the loss of a data packet can be avoided, the CDN scheduling under a 5G scene is realized, the service content is effectively distributed, a user can acquire data from the nearest CDN node, and the time delay of the user for acquiring the information is reduced.
Based on the same technical concept, an embodiment of the present invention further provides an MEC network element for CDN scheduling, which is suitable for an access network edge layer in a 5G network architecture, as shown in fig. 2, and includes:
A transceiver module 201, configured to receive a trigger request sent by an UPF network element in a central layer of an access network; receiving a data request sent by the UPF network element at the central layer of the access network, and forwarding the data request to a target CDN node; and sending a response request returned by the target CDN node to a corresponding client.
a configuring module 202, configured to configure a UL classifier locally according to the trigger request, where the UL classifier may filter the data request according to a destination IP of the data request.
A filtering module 203, configured to filter the data request through the UL classifier.
specifically, the triggering request is sent to the access network edge layer MEC network element after the access network center layer UPF network element receives a data request for a target CDN node.
specifically, the destination IP of the data request for the target CDN node is the target CDN node IP.
Optionally, the transceiver module 201 is further configured to receive a data request sent by the client.
Optionally, the transceiver module 201 is specifically configured to:
if the target IP of the data request is a target CDN node IP, sending the data request to the target CDN node;
and if the target IP of the data request is not the target CDN node IP, sending the data request to the UPF network element of the access network central layer.
Based on the same technical concept, the embodiment of the present invention further provides an MEC network element for CDN scheduling, where the MEC network element may have a large difference due to different configurations or performances, and includes one or more memories and processors, where the memory may be a transient memory or a permanent memory. The memory may store at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by the processor to implement the CDN scheduling method applicable to the access network edge layer MEC network element.
based on the same technical concept, the embodiment of the invention also provides a CDN scheduling system, wherein the method is suitable for a 5G network architecture, the CDN scheduling system comprises an access network central layer UPF network element and an access network edge layer MEC network element, and the access network edge layer MEC network element is used for executing the CDN scheduling method;
The access network central layer UPF network element is used for receiving a data request sent by a client and determining a target IP of the data request; and if the target IP is the target CDN node IP, sending a triggering request and the data request to an access network edge layer MEC network element.
It should be noted that: when the MEC network element provided in the foregoing embodiment implements CDN scheduling, the division of each functional module is merely used for example, and in practical application, the function allocation may be completed by different functional modules as needed, that is, an internal structure of the MEC network element is divided into different functional modules to complete all or part of the functions described above. Meanwhile, the MEC network element and CDN scheduling method embodiment provided in the foregoing embodiment belong to the same concept, and a specific implementation process thereof is described in detail in the method embodiment and is not described herein again.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute the method according to the embodiments or some parts of the embodiments.
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (14)
1. a CDN scheduling method is characterized in that the method is applicable to a 5G network architecture and comprises the following steps:
An access network edge layer MEC network element receives a trigger request sent by an access network center layer UPF network element;
The access network edge layer MEC network element receives the data request sent by the access network center layer UPF network element and forwards the data request to the target CDN node;
And the access network edge layer MEC network element sends a response request returned by the target CDN node to a corresponding client.
2. The method of claim 1, wherein after the receiving, by the access network edge layer MEC network element, the trigger request sent by the access network center layer UPF network element, the method further comprises:
And the access network edge layer MEC network element locally configures an UL classifier according to the trigger request, wherein the UL classifier can filter the data request according to the destination IP of the data request.
3. the method of claim 2, further comprising:
the access network edge layer MEC network element receives a data request sent by the client;
the access network edge layer MEC network element filters the data request through the UL classifier;
and the access network edge layer MEC network element forwards the data request according to the filtering result.
4. the method of claim 3, wherein the forwarding, by the access network edge layer MEC network element, the data request according to the filtering result comprises:
If the target IP of the data request is a target CDN node IP, the access network edge layer MEC network element sends the data request to the target CDN node;
And if the destination IP of the data request is not the target CDN node IP, the access network edge layer MEC network element sends the data request to the access network central layer UPF network element.
5. the method of claim 1, wherein the trigger request is sent by the access network center layer UPF network element to the access network edge layer MEC network element after the access network center layer UPF network element receives a data request for a target CDN node.
6. The method of claim 5, wherein a destination IP of the data request for the target CDN node is a target CDN node IP.
7. The method of claim 1, wherein before the receiving, by the access network edge layer MEC network element, the trigger request sent by the access network center layer UPF network element, the method further comprises:
The UPF network element of the access network central layer receives the data request sent by the client and determines the target IP of the data request; and if the target IP is the target CDN node IP, sending a trigger request to the access network edge layer MEC network element.
8. The method of claim 7, wherein before the receiving, by the UPF network element, the data request sent by the client, the method further comprises:
The access network central layer UPF network element receives a DNS analysis request of the client to a target domain name and forwards the DNS analysis request to a corresponding DNS analysis server;
The access network central layer UPF network element receives a DNS analysis result of the target domain name, wherein the DNS analysis result is the target CDN node IP;
And the UPF network element of the access network center layer returns the DNS analysis result of the target domain name to the client, so that the client takes the target CDN node IP as a target IP in a subsequent data request of the target domain name.
9. a CDN scheduling system, wherein the method is applied to a 5G network architecture, the CDN scheduling system includes an access network center layer UPF network element and an access network edge layer MEC network element, and the access network edge layer MEC network element is configured to execute the CDN scheduling method according to any one of claims 1 to 8;
The access network central layer UPF network element is used for receiving a data request sent by a client and determining a target IP of the data request; and if the target IP is the target CDN node IP, sending a triggering request and the data request to an access network edge layer MEC network element.
10. A CDN scheduling method is characterized in that the method is applicable to a 5G network architecture and comprises the following steps:
an access network center layer UPF network element receives a data request of a client aiming at a target CDN node;
the access network center layer UPF network element sends a triggering request to an access network edge layer MEC network element;
and the access network center layer UPF network element sends the data request to the access network edge layer MEC network element.
11. the method of claim 10, wherein before the receiving, by the access network center layer UPF network element, a data request from a client for a target CDN node, the method further comprises:
the access network central layer UPF network element receives a DNS analysis request of the client to a target domain name and forwards the DNS analysis request to a corresponding DNS analysis server;
The access network central layer UPF network element receives a DNS analysis result of the target domain name, wherein the DNS analysis result is a target CDN node IP;
And the UPF network element of the access network center layer returns the DNS analysis result of the target domain name to the client, so that the client takes the target CDN node IP as a target IP in a subsequent data request of the target domain name.
12. the method of claim 10, wherein the receiving, by the access network center layer UPF network element, a data request from a client for a target CDN node comprises:
the UPF network element of the access network center layer receives the data request sent by the client and determines the destination IP of the data request;
The method for sending the triggering request to the access network edge layer MEC network element by the access network center layer UPF network element comprises the following steps:
and if the target IP of the data request is the target CDN node IP, the access network center layer UPF network element sends a trigger request to the access network edge layer MEC network element.
13. An MEC network element for CDN scheduling, adapted to an access network edge layer in a 5G network architecture, comprising:
The receiving and sending module is used for receiving a triggering request sent by a UPF network element of a central layer of an access network; receiving a data request sent by the UPF network element at the central layer of the access network, and forwarding the data request to a target CDN node; sending a response request returned by the target CDN node to a corresponding client;
a configuration module, configured to configure a UL classifier locally according to the trigger request, where the UL classifier may filter the data request according to a destination IP of the data request;
A filtering module for filtering the data request by the UL classifier.
14. An MEC network element for CDN scheduling, the MEC network element comprising a memory and a processor, the memory having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, the at least one instruction, the at least one program, the set of codes, or the set of instructions being loaded and executed by the processor to implement the CDN scheduling method of any one of claims 1-8.
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