KR20210066641A - Method for processing push data in icn system and apparatus for the same - Google Patents

Abstract

Disclosed is a method for processing push data in an information-centric network (ICN) system. According to one embodiment of the present disclosure, the method for processing the push data by a routing device in the ICN system including a client device, the routing device, and a content provision device includes: determining presence or absence of an entry corresponding to a received data packet in a subscription pending interest table (PIT); transmitting the received data packet at a pace recorded in the entry of the subscription PIT in response to the presence of the entry corresponding to the subscription PIT; determining presence or absence of the entry corresponding to the received data packet in a PIT in response to the absence of the entry corresponding to the subscription PIT; and transmitting the received data packet at a pace recorded in an entry of the PIT in response to the presence of the entry corresponding to the PIT. Accordingly, a content producer is able to rapidly and efficiently transmit the push data.

Description

Method and apparatus for processing push data in ICN system {METHOD FOR PROCESSING PUSH DATA IN ICN SYSTEM AND APPARATUS FOR THE SAME}

The present disclosure relates to an information-centric network system, and more particularly, to a method and apparatus for processing routing in an information-centric network system.

The proliferation of the Internet and e-commerce continues to accelerate revolutionary changes in the network industry. Today, a significant amount of information exchange takes place online, from online movie viewing to daily news delivery, consumer sales, and instant messaging. An increasing number of Internet applications are also becoming mobile. However, the current Internet mainly operates on a location-based addressing scheme. The two most common protocols, the Internet Protocol (IP) and the Ethernet protocol, are both based on location-based addresses. That is, consumers of content can only receive content by explicitly requesting it from an address closely associated with a physical object or location (eg, an IP address or Ethernet Media Access Control (MAC) address). Restrictive addressing techniques are becoming increasingly inadequate to meet ever-changing network demands.

Recently, an Information-Centric network (ICN) architecture has been proposed in the industry. ICN brings a new approach to content delivery. Instead of having network traffic observed at the application level as an end-to-end conversation where the content moves, content is requested or returned based on its unique name, and the network moves from provider to consumer. content is routed.

The ICN system is configured in a pull-mode-based communication method. In other words, the client sends an interest packet to the content producer and receives a data packet in response. Accordingly, the content producer does not support a push-mode communication method for delivering data to the client without a request from the client. However, since there is a request for delivery of an important event such as an emergency situation, a similar push method is used as a method for a content producer to deliver data to a client without a request from the client. However, since the pseudo-push method utilizes the existing pull mode method, it cannot be said to be an effective push method.

In order to deliver important events such as emergency situations in a push mode instead of in a pull mode, the present invention provides information for packet delivery in each router that is not a similar push method, such as transmission of periodic interest packets, using a stateful method. It relates to a technology that allows content producers to deliver emergency information to consumers in real time by maintaining PIT entries.

An object of the present disclosure is to provide a method and an apparatus by which a content producer can quickly and efficiently deliver push data.

Another technical object of the present disclosure is to provide a method and apparatus capable of transmitting large-capacity information while minimizing bandwidth consumption when a content producer transmits push data.

The technical problems to be achieved in the present disclosure are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be able

According to an aspect of the present disclosure, a data processing method of a routing device may be provided. The method includes a process of checking whether an entry corresponding to a received data packet exists in a subscription Pending Interest Table (PIT), and in response to the existence of an entry corresponding to the subscription PIT, the received data packet In response to the process of delivering at the pace recorded in the entry of the subscription PIT, and the entry corresponding to the subscription PIT does not exist, the PIT (Pending Interest Table) of the entry corresponding to the received data packet It includes a process of confirming existence or not, and a process of forwarding the received data packet at a pace recorded in the PIT entry in response to the existence of an entry corresponding to the PIT.

According to another aspect of the present disclosure, a method for a client device to process an interest packet may be provided. The method comprises constructing a subscription interest packet for subscription to the content providing device, wherein the subscription interest packet includes a subscription identifier component, and the content providing device transmits a subscription to the registered client device. It may include the process of receiving a data packet.

According to another aspect of the present disclosure, a method for a content providing apparatus to process a data packet may be provided. The method includes receiving a subscription interest packet from the client device, the subscription interest packet including a subscription identifier component, identifying the subscription identifier component, and managing a subscription of the client device; confirming push data to be transmitted to the subscribed client device, and transmitting a subscription data packet including the push data to the subscribed client device through the routing device.

According to another aspect of the present disclosure, a routing apparatus may be provided. The device checks whether an entry corresponding to the received data packet exists in a subscription Pending Interest Table (PIT), and, in response to the existence of an entry corresponding to the subscription PIT, converts the received data packet to the A subscription PIT processing unit that transmits at the pace recorded in the entry of the subscription PIT, and in response to the absence of an entry corresponding to the subscription PIT, the PIT (Pending Interest Table) of the entry corresponding to the received data packet and a PIT processing unit that checks whether there is an entry corresponding to the PIT and transmits the received data packet at a pace recorded in the PIT entry in response to the existence of the entry.

The features briefly summarized above with respect to the present disclosure are merely exemplary aspects of the detailed description of the present disclosure that follows, and do not limit the scope of the present disclosure.

According to the present disclosure, a method and apparatus by which a content producer can deliver push data quickly and efficiently can be provided.

According to the present disclosure, when a content producer transmits push data, a method and apparatus capable of transmitting large-capacity information while minimizing bandwidth consumption may be provided.

The effects obtainable in the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present disclosure belongs from the description below. will be.

1 shows an architecture of a network to which a network device according to an embodiment of the present disclosure is applied.
2A illustrates an operation of forwarding an interest packet in a network system to which a network device according to an embodiment of the present disclosure is applied.
2B illustrates an operation of transmitting a data packet in a network system to which a network device according to an embodiment of the present disclosure is applied.
3 is a diagram illustrating CS, PIT, sPIT, and FIB used in a network device according to an embodiment of the present disclosure.
4 illustrates an operation of transmitting a data packet using sPIT in a network system to which a network device according to an embodiment of the present disclosure is applied.
5 is a diagram illustrating a detailed configuration of a network device according to an embodiment of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings so that those of ordinary skill in the art to which the present disclosure pertains can easily implement them. However, the present disclosure may be implemented in several different forms and is not limited to the embodiments described herein.

In describing an embodiment of the present disclosure, if it is determined that a detailed description of a well-known configuration or function may obscure the gist of the present disclosure, a detailed description thereof will be omitted. And, in the drawings, parts not related to the description of the present disclosure are omitted, and similar reference numerals are attached to similar parts.

In the present disclosure, when it is said that a component is "connected", "coupled" or "connected" with another component, it is not only a direct connection relationship, but also an indirect connection relationship in which another component exists in the middle. may also include. In addition, when a component is said to "include" or "have" another component, it means that another component may be further included without excluding other components unless otherwise stated. .

In the present disclosure, components that are distinguished from each other are for clearly explaining each characteristic, and do not necessarily mean that the components are separated. That is, a plurality of components may be integrated to form one hardware or software unit, or one component may be distributed to form a plurality of hardware or software units. Accordingly, even if not specifically mentioned, such integrated or distributed embodiments are also included in the scope of the present disclosure.

In the present disclosure, components described in various embodiments do not necessarily mean essential components, and some may be optional components. Accordingly, an embodiment composed of a subset of components described in an embodiment is also included in the scope of the present disclosure. In addition, embodiments including other components in addition to components described in various embodiments are also included in the scope of the present disclosure.

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

1 shows an architecture of a network to which a network device according to an embodiment of the present disclosure is applied.

In an embodiment of the present disclosure, the network 1 may include at least one node 101 - 110 , and each node 101 - 110 in the network 1 may be connected to one or more other nodes. Although the connection between the nodes 101-110 included in the network is exemplified in FIG. 1 , the present disclosure is not limited thereto, and various connections may be made.

The network 1 may comprise an information-centric, local network, super-network, or sub-network. Each of these networks is interconnected so that a node in one network can reach a node in another network.

The nodes 101 - 110 may include an electronic device functioning as a router device that forwards packets of a network, a client device used or controlled by a user, a content providing device that provides content, and the like. Hereinafter, according to the function of the node, it may be collectively referred to as a router device, a client device, a content providing device, and the like.

In the network 1 , the second node 102 is a content providing device that provides content, the tenth node 110 is a client device that requests the content, and the third node 103 and the sixth node 106 are is a router device that forwards packets between the second node 101 and the tenth node 110 .

The content providing device 102 generates an interest packet including information requesting the content requested by the user, and a router device connected to the content providing device 102, that is, the first router device 106 and It is transmitted to the content providing device 102 through the second router device 103 . Correspondingly, the content providing apparatus 102 checks the interest packet, detects the content requested by the user, generates a data packet including the corresponding content, and through the reverse path of the path through which the interest packet is transmitted. , the data packet may be delivered to the client device 110 .

Furthermore, at least one router device included in the network 1 may participate in caching a local copy of the content while forwarding the interest packet or data packet.

Hereinafter, with reference to FIGS. 2A and 2B , the operation of the router apparatus for processing content caching will be described in detail.

2A illustrates an operation of forwarding an interest packet in a network system to which a network device according to an embodiment of the present disclosure is applied.

The client device 21 is a computing device from which a user requests a specific content, and the router device 23 is a relay device that transmits signals or data between the client device 21 and the content providing device 25 in the ICN system. In FIG. 2A , the content providing device 25 exemplifies “YouTube” that provides a video streaming service. The content providing device 25 of FIG. 2A may be a server device that provides video content.

The user transmits a content request message (Interest Packet) with the name of the content to be provided through the client device 10 toward the router device 23 . The client device 21 transmits an interest packet for finding the content requested by the user to the neighboring router. For example, the client device A 21a transmits an interest packet to the neighboring router R3 23-3, and the router R3 23-3 transmits the neighbor router R1 23- on the path to the content providing device 25. 1) sends an interest packet. The router R1 (23-1) transmits the interest packet to the neighboring router R0 (23-0) on the path to the content providing device 25 . The router R0 (23-0) transmits an interest packet to the content providing device (25). The remaining client device B 21b and client device C 21c transmit the interest packet to the content providing device 25 in a similar manner.

Meanwhile, when configuring the interest packet, the client device 10 may configure a subscription interest packet for subscription. For example, a subscription interest packet may include a subscription identifier component (eg, a “subscription”) capable of identifying a subscription. Specifically, the interest packet may be configured in the form of “prefix/s1”, and the subscription interest packet may be configured in the form of “prefix/subscription/s1”. Based on this, the content providing apparatus 25 may determine whether the received interest packet is a general interest packet or a subscription interest packet. If it is confirmed that the received interest packet is a subscription interest packet, the content providing device 25 processes the subscription for the corresponding user or client device 21 , and transmits the result to the user through the router device 23 . Alternatively, it may be provided to the client device 21 . In this case, the content providing device 25 may provide the subscription processing result through a data packet.

2B illustrates an operation of transmitting a data packet in a network system to which a network device according to an embodiment of the present disclosure is applied.

The path through which the data packet is transmitted may proceed in the reverse order of the path through which the interest packet is transmitted. The difference between the ICN system and the IP-based network is that when the router device 23 receives a data packet, it is configured to constantly store the corresponding data in its own storage medium. For example, when router R3 (23-3) receives an interest packet for content having the same content name as before from client device A (21a), router R3 (25-3) sends an interest packet to another router device. It is configured to deliver the content stored in its own storage medium to the client device A 21a without transferring the .

To this end, the router device 23 may include a content store (hereinafter, referred to as 'CS') 310 , and a pending interest table (hereinafter referred to as 'PIT') for managing the CS 310 . '), 320) and a Forwarding Information Base (hereinafter referred to as 'FIB'), 330). Also, the router device 23 may create and manage interfaces 31 , 33 , 35 for communicating with other nodes.

Hereinafter, an interface or a face refers to the same target and refers to a path through which packets are exchanged with other nodes in a router device.

The CS 310 stores content (data) transmitted from the content providing device 25 , and may include a content name and data corresponding to the content name.

The PIT 320 may store and manage data for guiding a content data delivery path. For example, the PIT 320 may be composed of a table containing information on where the interest packet came from, for example, the table includes the content name included in the interest packet and the interface (or the interface from which the interest packet is requested) face) may be included. Also, when the interest packet is transmitted to another node, the PIT 320 may include information on which interface (face) the interest packet is transmitted to.

The subscription PIT (hereinafter, referred to as 'sPIT') 325 may store and manage data for guiding a data delivery path for subscription content. For example, the sPIT 325 may be composed of a table containing information on where an interest packet requested to be subscribed came from. For example, the table includes the name of the content requested to be subscribed and the interface (or face) through which the subscribed data is to be delivered. ), and time information indicating the time to maintain the subscription may be included. The sPIT 325 may be generated while the content providing device 25 provides a data packet including a subscription processing result. An operation of generating the sPIT 325 will be described in detail with reference to FIG. 4 below.

FIB 330 is used to forward interest packets. The FIB 330 serves as a routing table that determines the interface through which the packet is forwarded from the content name. The FIB 330 is generated by the content providing device 25 performing a registration operation on the ICN system core.

On the other hand, assuming that the router device 23 has received the interest packet from the face 1 33, the router device 23 first refers to the name of the content in the interest packet to see if the content is in the CS 310. Check it.

Since the corresponding content is stored in the CS 310 , the router device 23 returns the corresponding content to the phase 1 33 where the interest packet is received.

On the other hand, when the router device 23 receives a content request from the face 0 31 and the corresponding content is not stored in the CS 310 , the router device 23 stores the same content name in the PIT 320 . Checks whether an entry exists. If there is an item stored with the same content name, the router device 23 discards the packet because the previously sent packet has been received again. If there is no item registered with the same content name in the PIT 320 , the router device 23 records the content name and interface in the PIT 320 , and searches based on the content name in the FIB 330 (name lookup) to find the corresponding entry.

In the process of processing the search or lookup of the CS 310, PIT 320, FIB 330, etc., the router device 23 may process a search or lookup according to longest prefix matching (LPM). have.

The router device 23 determines a pace at which to transmit the interest packet based on information registered in the FIB 330 , and transmits the interest packet to the interface 2 35 .

4 illustrates an operation of transmitting a data packet using sPIT in a network system to which a network device according to an embodiment of the present disclosure is applied.

The router device receives the data packet (S401) and checks the PIT table provided therein (S405, S406). If there is no data packet name in the PIT, the data packet is a packet that no one has requested, and thus the router device may discard the data packet. If it is a data packet having a name existing in the PIT, the router device checks the component included in the data packet, checks whether a subscription identifier component (“subscription”) exists, and confirms whether it is a subscription data packet (S407). If it is not a subscription data packet, the router device processes the corresponding data packet according to the general data packet processing method (S411). For example, the router device may transmit the corresponding data packet to the face existing in the PIT, and then delete the entry of the corresponding PIT.

On the other hand, if it is a subscription data packet, the router device adds an entry to the sPIT information (S408). Thereafter, the router device may forward the subscription data packet to the next node based on the face information present in the PIT and delete the corresponding entry from the PIT (S409).

Through the above-described operation, the router device may generate and manage sPIT information for the subscription data packet. In this way, when a data packet is received while managing the sPIT information, the router device preferably checks the sPIT information prior to checking the PIT to process the data packet (S402, S403, and S404).

Furthermore, sPIT information may overflow when many entries are stored. To solve this problem, when generating a subscription interest packet, a subscription interest packet may be generated by including a "CanBePrefix option" component. When the subscription interest packet has a "CanBePrefix option" component, when generating an entry in the sPIT information, the router device aggregates entries having the same prefix and the same interface receiving the packet among entries existing in the sPIT into one. )can do. In this way, by using the "CanBePrefix option" component, the number of entries provided in the sPIT can be reduced, and the overflow problem of the table can be solved.

Although, in an embodiment of the present disclosure, the PIT and the sPIT are described as separate tables, the present disclosure is not limited thereto, and the PIT and the sPIT may be configured in various forms. For example, PIT and sPIT may be physically implemented in one table storage space.

5 is a diagram illustrating a detailed configuration of a network device according to an embodiment of the present disclosure.

The network device according to an embodiment of the present disclosure may be provided in the router device and may perform various operations for routing in the ICN system. Hereinafter, the network device transmits an interest packet using a content name will be explained based on

The router device 50 may include a memory device 51 , a processor device 52 , and a communication interface device 55 .

The memory device 51 may include a small TCAM, a DARM, or the like.

The memory device 51 may store a pending interest table (PIT), a subscription PIT (sPIT), and cached content (CS) including a content name included in the interest packet and interface information to which the interest packet is transmitted. have. Also, the memory device 51 may store an FIB that determines a pace at which an interest packet is to be transmitted.

The processor device 52 may check information included in the interest packet received from the client device or the data packet received from the content providing device, and control the communication interface device 55 using the checked information.

In particular, the processor device 52 may record information in PIT, sPIT, CS, FIB, or the like, or control delivery of an interest packet or data packet based on information recorded in PIT, sPIT, CS, FIB, or the like.

Specifically, the processor device 52 may identify a content name included in an interest packet or a data packet, and record the content name information in PIT, sPIT, CS, FIB, or the like.

Furthermore, when storing the content name, the processor device 52 may convert it into a hash value using a predetermined hash function and store it in hardware such as DARM. Correspondingly, when the processor device 52 searches for information recorded in PIT, sPIT, CS, FIB, etc., the content name is converted into a hash value using a predetermined hash function, and then the corresponding hash value is stored. You can search.

More specifically, the processor device 52 may include a CS processing unit 52a, a PIT management unit 52b, an sPIT management unit 52c, and an FIB management unit 52d.

The CS processing unit 52a may receive the data packet, and store and manage content included in the data packet in the CS storage unit 51a of the memory device 51 .

The CS processing unit 52a may identify a content name included in the interest packet and check whether a corresponding content is stored in the CS storage unit 51a of the memory device 51 . In addition, the CS processing unit 52a may provide the corresponding content or call the PIT management unit 52b according to whether the corresponding content is stored in the CS storage unit 51a.

The PIT management unit 52b may check the content name included in the interest packet and check whether the corresponding content name exists in the PIT. If the corresponding content name exists in the PIT, the corresponding interface (or face) can be identified and provided.

In addition, when the corresponding content name does not exist in the PIT, the PIT management unit 52b may register the content name in the PIT, check the interface (or face) through which the interest packet is transmitted, and record it. In this case, the interest packet is forwarded to another node, and the FIB management unit 52d may process forwarding of the interest packet by using the FIB. Specifically, the FIB management unit 52d may check the prefix of the content name and check whether the corresponding prefix exists in the FIB. When the corresponding prefix exists in the FIB, the FIB management unit 52d may check an interface (or face) corresponding thereto, and transmit it to the communication interface device to process the forwarding of the interest packet. On the other hand, if the corresponding prefix does not exist in the FIB, the FIB management unit 52d registers the prefix of the content name in the FIB, checks the interface (or face) to which the communication interface device transmits the interest packet, and identifies the interface (or face) to the communication interface device. It can be registered together with the aforementioned prefix.

The sPIT management unit 52c may check whether a subscription component included in the data packet exists, and check whether a corresponding content name exists in the PIT. When the corresponding content name exists in the PIT, the sPIT can be configured and stored by checking the corresponding interface (or face). In this case, the sPIT management unit 52c may delete the content name corresponding to the newly registered entry in the sPIT from the PIT.

In particular, in response to the reception of the data packet, the sPIT management unit 52c preferentially operates, so that when a content name exists in an entry of the sPIT, the data packet can be delivered according to the face information recorded in the sPIT. On the other hand, when the content name does not exist in the entry of the sPIT, the sPIT manager 52c may request an operation from the PIT manager 52b.

Also, the sPIT management unit 52c may check the valid time of an entry recorded in the sPIT, and may delete an entry whose valid time has expired from the sPIT.

Furthermore, when creating an entry in sPIT information, it is checked whether the packet includes a "CanBePrefix option" component, and when the "CanBePrefix option" component is included, the sPIT management unit 52c determines whether a prefix is present in the sPIT. It is desirable to create by aggregating entries that are identical and have the same interface receiving the packet.

The flow manager 53 may perform an LPM lookup of the FIB to deliver an interest packet or a data packet to a destination.

According to the present invention, it is possible to quickly and stably transmit push data provided by a content producer through generation and management of a subscription PIT (sPIT).

In addition, according to the present invention, push data provided by a content producer can be stably transmitted without periodic packet transmission, and further, an increase in network traffic can be prevented. In addition, since the path from the content producer to the client device is designed on the network through the subscription PIT (sPIT), the latest event information generated by the producer can be delivered to the client side quickly.

The steps of a method or algorithm described in connection with the embodiments disclosed herein may be directly implemented in hardware, a software module executed by a processor, or a combination of the two. A software module may reside in a storage medium (ie, memory and/or storage) such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, a CD-ROM. An exemplary storage medium is coupled to the processor, the processor capable of reading information from, and writing information to, the storage medium. Alternatively, the storage medium may be integral with the processor. The processor and storage medium may reside within an application specific integrated circuit (ASIC). The ASIC may reside within the user terminal. Alternatively, the processor and storage medium may reside as separate components within the user terminal.

Example methods of the present disclosure are expressed as a series of operations for clarity of description, but this is not intended to limit the order in which the steps are performed, and if necessary, each step may be performed simultaneously or in a different order. In order to implement the method according to the present disclosure, other steps may be included in addition to the illustrated steps, other steps may be included except some steps, or additional other steps may be included except some steps.

Various embodiments of the present disclosure do not list all possible combinations but are intended to describe representative aspects of the present disclosure, and matters described in various embodiments may be applied independently or in combination of two or more.

In addition, various embodiments of the present disclosure may be implemented by hardware, firmware, software, or a combination thereof. For implementation by hardware, one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general purpose It may be implemented by a processor (general processor), a controller, a microcontroller, a microprocessor, and the like.

The scope of the present disclosure includes software or machine-executable instructions (eg, operating system, application, firmware, program, etc.) that cause an operation according to the method of various embodiments to be executed on a device or computer, and such software or and non-transitory computer-readable media in which instructions and the like are stored and executed on a device or computer.

Claims (14)

In an ICN system including a client device, a routing device, and a content providing device, a method for the routing device to process push data, the method comprising:
A process of confirming the existence of an entry corresponding to the received data packet with respect to the subscription PIT (Subscription Pending Interest Table);
In response to the existence of an entry corresponding to the subscription PIT, forwarding the received data packet at a pace recorded in the entry of the subscription PIT;
In response to the absence of an entry corresponding to the subscription PIT, checking whether an entry corresponding to the received data packet exists in a PIT (Pending Interest Table);
and forwarding the received data packet at a pace recorded in the PIT entry in response to the existence of an entry corresponding to the PIT.
According to claim 1,
checking whether the received data packet is a subscription data packet;
and registering an entry in the subscription PIT in response to the received data packet being a subscription data packet.
3. The method of claim 2,
In the entry of the subscription PIT,
and name information of the subscription data packet, face information corresponding to the subscription data packet, and an effective time of the subscription data packet.
3. The method of claim 2,
The process of registering an entry in the subscription PIT is,
checking whether an entry corresponding to the name information of the subscription data packet exists in the PIT;
and configuring an entry of the subscription PIT based on information recorded in the entry of the PIT as an entry corresponding to the name information of the subscription data packet exists in the PIT.
5. The method of claim 4,
The process of registering an entry in the subscription PIT is,
The process of registering a new entry in the subscription PIT;
and deleting an entry of the PIT corresponding to a new entry of the subscription PIT.
3. The method of claim 2,
The process of checking whether the "CanBePrefix option" component is included in the subscription data packet;
as the "CanBePrefix option" component is included in the subscription data packet, checking whether an entry having the same prefix exists among entries of the subscription PIT;
and configuring information of the subscription data packet by integrating the information of the subscription data packet into the entry having the same prefix as the entry having the same prefix exists.
In an ICN system including a client device, a routing device, and a content providing device, a method for the client device to process an interest packet, the method comprising:
constructing a subscription interest packet for subscription to the content providing device, wherein the subscription interest packet includes a subscription identifier component;
and receiving, by the content providing device, a subscription data packet transmitted to the registered client device.
In an ICN system including a client device, a routing device, and a content providing device, a method for the content providing device to process a data packet, the method comprising:
receiving a subscription interest packet from the client device, wherein the subscription interest packet includes a subscription identifier component;
identifying the subscription identifier component and managing subscriptions of the client device;
and confirming push data to be transmitted to the subscribed client device, and transmitting a subscription data packet including the push data to the subscribed client device through the routing device.
In the routing device provided in the ICN system,
The existence of an entry corresponding to the received data packet is checked for the subscription PIT (Subscription Pending Interest Table), and in response to the existence of an entry corresponding to the subscription PIT, the received data packet is converted into the subscription PIT. A subscription PIT processing unit that delivers at the pace recorded in the entry;
In response to the absence of an entry corresponding to the subscription PIT, the PIT (Pending Interest Table) is used to check whether an entry corresponding to the received data packet exists, and to confirm that an entry corresponding to the PIT exists. Correspondingly, a PIT processing unit for forwarding the received data packet at a pace recorded in the PIT entry.
10. The method of claim 9,
The subscription PIT processing unit,
check whether the received data packet is a subscription data packet;
and registering an entry in the subscription PIT in response to the received data packet being a subscription data packet.
11. The method of claim 10,
In the entry of the subscription PIT,
Routing device, characterized in that it includes name information of the subscription data packet, face information corresponding to the subscription data packet, and an effective time of the subscription data packet.
11. The method of claim 10,
The subscription PIT processing unit,
Check whether an entry corresponding to the name information of the subscription data packet exists in the PIT,
The routing apparatus according to claim 1, wherein an entry corresponding to the name information of the subscription data packet exists in the PIT, and an entry of the subscription PIT is configured based on information recorded in the entry of the PIT.
13. The method of claim 12,
The subscription PIT processing unit,
Register a new entry in the subscription PIT,
Routing apparatus, characterized in that the deletion processing of the PIT entry corresponding to the new entry of the subscription PIT.
11. The method of claim 10,
The subscription PIT processing unit,
Check whether the "CanBePrefix option" component is included in the subscription data packet,
As the "CanBePrefix option" component is included in the subscription data packet, it is checked whether there is an entry having the same prefix among the entries of the subscription PIT,
In accordance with the existence of an entry having the same prefix, the routing apparatus according to claim 1, wherein the information of the subscription data packet is integrated into the entry having the same prefix.

Images