WO2013172552A1 - Procédé de transmission de contenus et système prenant en charge un transfert, et support d'enregistrement lisible par ordinateur - Google Patents

Procédé de transmission de contenus et système prenant en charge un transfert, et support d'enregistrement lisible par ordinateur Download PDF

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Publication number
WO2013172552A1
WO2013172552A1 PCT/KR2013/002916 KR2013002916W WO2013172552A1 WO 2013172552 A1 WO2013172552 A1 WO 2013172552A1 KR 2013002916 W KR2013002916 W KR 2013002916W WO 2013172552 A1 WO2013172552 A1 WO 2013172552A1
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Prior art keywords
decompressor
content
client
compressor
handover
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PCT/KR2013/002916
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English (en)
Korean (ko)
Inventor
양우석
양철웅
이재혁
Original Assignee
주식회사 아라기술
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020120108307A external-priority patent/KR101432719B1/ko
Application filed by 주식회사 아라기술 filed Critical 주식회사 아라기술
Priority to US14/401,402 priority Critical patent/US20150133120A1/en
Publication of WO2013172552A1 publication Critical patent/WO2013172552A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/10—Flow control between communication endpoints
    • H04W28/14—Flow control between communication endpoints using intermediate storage

Definitions

  • the present invention relates to a content transmission method, a system and a computer-readable recording medium that supports handover. More specifically, even if a handover occurs in a mobile communication terminal, compressed or cached content is stored.
  • LTE Long Term Evolution
  • a user terminal receives data after establishing a Transmission Control Protocol (TCP) connection with a specific device such as a compression device or a caching server.
  • TCP Transmission Control Protocol
  • a specific device such as a compression device or a caching server.
  • TCP Transmission Control Protocol
  • the original connection is performed. It can't be connected to a specific device, or the connection cost is so high that it becomes difficult to provide data through existing data sessions.
  • the object of the present invention is to solve all the above-mentioned problems.
  • the present invention performs the compression and caching of the content using a compressor and a decompressor connected to the entry and exit end of the backbone, respectively, even if the handover occurs in the mobile communication terminal compressed content or cached content It is another object of the present invention to enable a normal and effective transmission to a mobile communication terminal.
  • a content transmission method supporting handover comprising: (a) a compressor compressing content received from a server when a request for switching to a compression mode is received; Transmitting the decompressor to a decompressor, and (b) when the handover occurs in the client, the compressor or the handover occurs after the client or the handover occurs without compressing the content received from the server.
  • a method is provided that includes transmitting to another decompressor coupled with a client.
  • a content delivery method supporting hand-over wherein (a) a decompressor is a content transmitted from a compressor to the decompressor and the compression is performed. If the contents stored in the dictionary of the decompressor match each other or more than a first threshold value, transmitting a request for switching to a compression mode to the compressor, (b) the decompressor is stored in a dictionary of the decompressor, Transmitting a content corresponding to the content compressed and transmitted from the compressor to the client, and (c) the decompressor stopping the content transmission to the client when a handover occurs in the client.
  • a method comprising a.
  • a method for delivering a content that supports handover comprising: (a) a decompressor, and a content transmitted from a compressor to the decompressor; If the contents stored in the dictionary of the decompressor match each other or more than a first threshold value, transmitting a request for switching to a compression mode to the compressor; (b) the compressor receives a request for switching to the compression mode. Compressing the content received from the server and transmitting the compressed content to the decompressor, (c) the decompressor corresponding to the compressed content transmitted from the compressor among the contents stored in the dictionary of the decompressor.
  • the compressor Transmitting the content to the client, and (d) when the handover occurs in the client, the compressor receives the transmission from the server. Transmitting uncompressed content to the client or another decompressor connected to the client after the handover has occurred, and wherein the decompressor stops transmitting content to the client. This is provided.
  • a method for delivering a content that supports handover comprising: (a) a compressor compressing content received from a server when a request for switching to a caching mode is received by a compressor; Stopping transmission to a decompressor, and (b) if the compressor has a handover at the client, using a tunneling technique, a first connection with the client before the handover has occurred; And causing the cached content stored in the decompressor's dictionary to be sent to the client or to another decompressor coupled with the client after the handover has occurred.
  • a method for delivering a content that supports handover comprising: (a) a decompressor, and a content transmitted from a compressor to the decompressor; If the content stored in the decompressor's dictionary is equal to or greater than a second threshold, sending a request to switch to caching mode to the compressor, (b) the decompressor is stored in the decompressor's dictionary Transmitting the content to the client, and (c) the decompressor, if a handover occurs in the client, uses the tunneling technique to decompress the decompressor connected to the client before the handover occurs. Cached content stored in the dictionary of is associated with the client or after the handover has occurred. The other decompressor that is comprises to be transmitted is provided.
  • a method for delivering a content that supports handover comprising: (a) a decompressor, and a content transmitted from a compressor to the decompressor; If the contents stored in the dictionary of the decompressor match each other or more than a second threshold value, transmitting a request for switching to a caching mode to the compressor; (b) the compressor receives a request for switching to the caching mode.
  • the method including the step of so that the cached content that is stored in the dictionary in the decompressor that was determined sent to another decompressor which is connected to the client after the client or the hand-over has occurred are provided.
  • a content delivery system supporting handover when a request to switch to the compression mode is received, the content received from the server is compressed and transmitted to a decompressor (decompressor)
  • decompressor decompressor
  • a compression processing unit of a compressor when a handover occurs in the client, the client or another decompressor connected to the client after the handover occurs without compressing the content received from the server.
  • a system comprising a handover processing unit of the compressor for transmitting to a.
  • a content delivery system supporting handover, the content being transmitted from a compressor to a decompressor and stored in a dictionary of the decompressor. If the contents match each other more than the first threshold, a request for switching to the compression mode is transmitted to the compressor, and among the contents stored in the dictionary of the decompressor, contents corresponding to the contents compressed and transmitted from the compressor are sent to the client.
  • a decompression processing unit of the decompressor for transmitting and a handover processing unit of the decompressor for stopping content transmission to the client when a handover occurs in the client are provided.
  • a content delivery system supporting handover wherein a content transmitted to a user from a compressor and a content stored in a dictionary of the user are equal to or greater than a first threshold value. If it matches, the request for switching to the compression mode is transmitted to the compressor, and in the case of the compression mode, the content corresponding to the content compressed and transmitted from the compressor and transmitted to the client is transmitted to the client.
  • the control received from the server The system including the compressor and send it to another decompressor which is connected to the client after the client or the hand-over has occurred are provided uncompressed the Massachusetts.
  • a content delivery system supporting hand-over, wherein when a request for switching to a caching mode is received, transmitting content received from a server to a decompressor. If a handover occurs in the caching processor of the compressor and the client that stops, caching stored in the dictionary of the first decompressor connected to the client before the handover occurs by using a tunneling technique.
  • a system comprising a handover processing unit of the compressor to allow the transmitted content to be sent to the client or to another decompressor connected with the client after the handover has occurred.
  • a content delivery system supporting handover, the content being transmitted from a compressor to a decompressor and stored in a dictionary of the decompressor.
  • a caching processor of the decompressor which transmits a request for switching to a caching mode to the compressor when the contents coincide with each other more than a second threshold value, and transmits the content stored in the dictionary of the decompressor to the client, and the client
  • the cached content stored in the dictionary of the decompressor connected with the client before the handover occurs using the tunneling technique is generated after the client or the handover occurs.
  • a system that includes a hand-over processing unit of the decompressor is provided.
  • a content delivery system supporting handover, wherein a content transmitted to a user from a compressor and a content stored in a dictionary of the user are equal to or greater than a second threshold value. If it matches, it sends a request to switch to caching mode to the compressor and transmits the cached content stored in its dictionary to the client, and if a handover occurs in the client, before the handover occurs using a tunneling technique.
  • a decompressor that allows cached content stored in its dictionary that is associated with the client to be transmitted to the client or another decompressor associated with the client after the handover occurs;
  • the server Stops transmitting the received content to the decompressor, and if a handover occurs in the client, stores it in the dictionary of the decompressor connected to the client before the handover occurs by using a tunneling technique.
  • a system is provided that includes the compressor to allow cached content that has been cached to be sent to the client or to another decompressor coupled with the client after the handover occurs.
  • the handover can be supported in the mobile communication network, the effect of enabling the practical application in the mobile communication network is achieved.
  • the invention is a realistic invention that can be applied to the existing system of the mobile communication without significant impact.
  • FIG. 1 is a diagram schematically showing the overall configuration of a content delivery system that supports handover that may occur in a mobile communication network according to the present invention.
  • FIG. 2 is a view showing the internal configuration of the compressor 200 according to an embodiment of the present invention.
  • FIG. 3 is a view showing the internal configuration of the decompressor 300 according to an embodiment of the present invention.
  • FIG. 4 is a diagram illustrating a process of transmitting content in a compression mode according to an embodiment of the present invention.
  • FIG. 5 is a diagram exemplarily illustrating a process of supporting handover in a compression mode according to an embodiment of the present invention.
  • FIG. 6 is a diagram illustrating a process of transmitting content in a caching mode according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating a process of supporting handover in a caching mode according to an embodiment of the present invention.
  • P-GW packet data network gateway
  • a network device other than the server for example, a compressor, a decompressor, etc.
  • the server for example, a compressor, a decompressor, etc.
  • It can be connected only at the network layer, not at the application layer or the transport layer (for example, TCP connection, UDP connection, etc.).
  • the transport layer for example, TCP connection, UDP connection, etc.
  • IP packets that is, datagrams, may be transmitted or received, or only processing on the network layer may be performed.
  • the compressor In the content transmission session between the compressor and the decompressor, there is an operation mode that specifies the transmission type of the compressor and the decompressor for each session.
  • the compressor delivers the content without compressing it to the client.
  • compression mode when the compressor compresses and transmits the content, the decompressor decompresses and sends the compressed content to the client.
  • the compressor may stop transmitting and the decompressor may send cached content stored in its dictionary to the client. That is, if compression is possible, content can be compressed and transmitted through compression mode to reduce traffic of the backbone. If caching is enabled, cached content stored in the decompressor's dictionary is directly transmitted to the client through caching mode. Doing so can reduce backbone traffic and improve QoE.
  • the cached content stored in the decompressor dictionary connected to the client before the handover using the tunneling technique is transmitted to the client after the handover through the tunnel on the communication network. It can be sent to the client via a newly connected decompressor or sent directly to the client.
  • FIG. 1 is a diagram schematically showing the overall configuration of a content delivery system that supports handover that may occur in a mobile communication network according to the present invention.
  • the overall system of the present invention comprises a communication network 10 including a backbone 15, a server 100, a compressor 200, a decompressor ( 300 and the client 400. Meanwhile, as shown in FIG. 1, a packet data network gateway (P-GW) 250 and a dictionary 350 may be further included according to an embodiment of the present invention.
  • P-GW packet data network gateway
  • the communication network 10 may be configured regardless of its communication mode such as wired and wireless, and may include the Internet (World Wide Web), a known wireless LAN (WLAN), code division multiple access (CDMA), and wideband code (WCDMA). It should be understood that the concept includes both division multiple access (GSM) or global system for mobile communications (GSM) networks.
  • GSM division multiple access
  • GSM global system for mobile communications
  • the entry end and the exit end are connected to the compressor 200 and the decompressor 300, respectively, and the data coming from the compressor 200 or the decompressor 300. It may include a backbone 15, which is a large transmission line that can collect and quickly transmit.
  • the server 100 is a client 400 through a communication network 10 composed of a compressor 200, a decompressor 300, a packet data network gateway 250, etc. It can communicate with and can perform a function of providing various types of information at the request of the client (400).
  • the server 100 may be an operation server of an Internet search portal site, and the information provided to the client 400 may be various information about a web page, an image, a video, an audio, and the like that match a query. .
  • the compressor 200 basically decompresses the packet received from the server 100 so that the content transmitted by the server 100 is transmitted to the client 400. 300) or to the client 400. More specifically, the compressor 200 according to an embodiment of the present invention may deliver the content received from the server 100 in the normal mode, and the content received from the server 100 in the compressed mode. It can be delivered by compressing, and in the caching mode can stop the delivery of the content received from the server 100, if the handover occurs in the client 400 during the caching mode handover using tunneling technology Cached content stored in the dictionary 350 of the decompressor 300 previously connected to the client 400 is transmitted to the client 400 via the decompressor 300 newly connected after the handover. May be sent directly to the client 400.
  • FIG. 2 is a view showing the internal configuration of the compressor 200 according to an embodiment of the present invention.
  • the compressor 200 includes a compression processor 210, a caching processor 220, a handover processor 230, and a transceiver 230.
  • the compression processor 210, the caching processor 220, the handover processor 230, and the transceiver 230 may be program modules in which at least some of them communicate with an external system.
  • Such program modules may be included in the compressor 200 in the form of operating systems, application modules, and other program modules, and may be physically stored on a variety of known storage devices.
  • at least some of these program modules may be stored in a remote storage device capable of communicating with the compressor 200.
  • such program modules include, but are not limited to, routines, subroutines, programs, objects, components, data structures, etc. that perform particular tasks or execute particular abstract data types, described below, in accordance with the present invention.
  • the decompressor 300 basically compresses the compressor 200 or another decompressor 300 so that the content transmitted by the server 100 is transmitted to the client 400. Performs a function of transmitting the content received from the content or the content stored in its dictionary 350 to the client 400.
  • the decompressor 300 may transmit the content received from the compressor 200 to the client 400 as it is in the normal mode, and if it is the compressed mode, its dictionary Content corresponding to the compressed content received from the compressor 200 among the contents stored in the 350 may be transmitted to the client 400, and in the caching mode, the content corresponding to the compressed content received from the compressor 200 may be transmitted.
  • the cached content stored in the dictionary 350 may be delivered.
  • the handover occurs in the client 400 during the caching mode, the handover is performed using a tunneling technique.
  • Cached content stored in the dictionary 350A of the decompressor 300A, which was previously connected to the client 400, after the handover The client may be sent to the decompressor (300B) or the client 400 that is associated with a 400.
  • the decompressor 300B which is connected to the client 400 after the handover, requests to compress and transmit content
  • the decompressor (which was connected to the client 400 before the handover) 300A) may compress and transmit the content.
  • FIG. 3 is a view showing the internal configuration of the decompressor 300 according to an embodiment of the present invention.
  • the decompressor 300 includes a decompression processor 310, a caching processor 320, a handover processor 330, and a transceiver 340.
  • the decompression processor 310, the caching processor 320, the handover processor 330, and the transceiver 340 may be program modules in which at least some of them communicate with an external system.
  • Such program modules may be included in the decompressor 300 in the form of an operating system, an application module, and other program modules, and may be physically stored on various known storage devices.
  • at least some of these program modules may be stored in a remote storage device capable of communicating with the decompressor 300.
  • such program modules include, but are not limited to, routines, subroutines, programs, objects, components, data structures, etc. that perform particular tasks or execute particular abstract data types, described below, in accordance with the present invention.
  • the client 400 is a device having a function to communicate with each other by connecting to a communication network, a personal computer (for example, a laptop computer, etc.), PDA, tablet computer, As long as a device having memory means and a microprocessor, such as a smart phone or a mobile phone, can be a client 400 according to the present invention.
  • the client 400 may move in a physical space as a mobile communication terminal, and thus a hand-over phenomenon may occur in which a communication network to which the client 400 belongs is changed. .
  • the compressor 200 and the decompressor 300 there may be two network devices, that is, the compressor 200 and the decompressor 300, on the communication network 10 through which the content is transmitted, and the compressor 200 compresses the content.
  • the decompressor 300 restores the original content using the content corresponding to the content transmitted in the compressed state among the contents stored in the dictionary 350 which is a kind of storage. This may be transmitted to the client 400, thereby reducing the transmission bandwidth at the backbone 15 between the compressor 200 and the decompressor 300.
  • FIG. 4 is a diagram illustrating a process of transmitting content in a compression mode according to an embodiment of the present invention.
  • the compressor 200 does not process any packet transmitted from the client 400 (for example, a packet containing information about a content request to the server 100). Can be delivered to the server 100 without doing.
  • the compressor 200 and the client 400 do not establish a TCP connection in the transport layer, but the compressor 200 receives a datagram packet from the client 400 at the network layer.
  • the compressor 200 includes a packet including data constituting content from the server 100 as payload (actual data.
  • a packet may be composed of a packet header and a payload). Can be sent.
  • the compressor 200 and the server 100 do not establish a TCP connection at the transport layer, but the compressor 200 receives datagram packets from the server 100 at the network layer.
  • the compressor 200 may retransmit the packet received from the server 100 to the decompressor 300 without compressing it (FIG. 4A). ) Reference).
  • the compressor 200 may generate a compressed packet by compressing the payload of the packet received from the server 100 using a predetermined compression algorithm.
  • the compressor 200 may transmit the compressed packet generated as described above to the decompressor 300, and together with the uncompressed payload stored in the dictionary 350 of the decompressor 300.
  • Meta information eg, compressed MD5 signature information, protocol information, etc.
  • compression algorithms such as Message Digest 4 (MD4) and Message Digest 5 (MD5) may be exemplified (see FIG. 4B). ).
  • the compressor 200 may switch the transmission mode from the normal mode to the compression mode with reference to the request for switching to the compression mode transmitted from the decompressor 300.
  • the compressor 200 may switch the transmission mode from the compression mode to the normal mode with reference to the request to switch to the normal mode transmitted from the decompressor 300.
  • the fact that the packet transmitted from the client 400 has reached the compressor 200 without passing through the decompressor 300 indicates that the client 400 has resulted in a handover.
  • the compressor 200 may set the transmission mode to the normal mode because it means that the 400 is no longer connected to the decompressor 300 capable of performing the decompression.
  • the decompressor 300 may retransmit to the compressor 200 without any processing for the packet transmitted from the client 400.
  • the decompressor 300 when the decompressor 300 receives an uncompressed packet from the compressor 200, the decompressor 300 checks the dictionary 350, which is a data store, and the payload of the packet is stored in the dictionary. Can be determined.
  • the decompressor 300 may record the number of consecutive transmissions of uncompressed packets having payloads that are already stored in the dictionary in a session with the compressor 200. . As a result, if the number of times that the packet received by the decompressor 300 from the compressor 200 in the particular session is continuously stored in the dictionary 350 of the decompressor 300 is greater than or equal to the preset first threshold value.
  • the decompressor 300 may determine that the content transmitted through the session is already stored in the dictionary 350. Accordingly, the decompressor 300 switches the compressor 200 to the compression mode.
  • the request signal can be transmitted.
  • the decompressor 300 when the payload of the packet received from the compressor 200 is not stored in the dictionary 350, the decompressor 300 includes the payload included in the packet. After compression using a predetermined compression algorithm (eg, MD4, MD5, etc.), the uncompressed payload and the compressed payload can be stored together in the dictionary.
  • the compressed payload may serve as an identifier (ie, a key) for specifying an uncompressed payload. More specifically, according to an embodiment of the present invention, the compressed payload is stored in the dictionary 350.
  • the decompressor 300 when the decompressor 300 receives a packet including a compressed payload from the compressor 200, the decompressor 300 checks the dictionary 350 which is a data store and compresses the packet. It may be determined whether the uncompressed payload corresponding to the received payload is stored in the dictionary 350. More specifically, the decompressor 300 according to an embodiment of the present invention, the compressor 300 by comparing the compressed payload stored in the dictionary 350 and the compressed payload of the packet transmitted from the compressor 200. It is possible to determine whether or not the uncompressed payload corresponding to the compressed payload of the packet transmitted from) is stored in the dictionary 350.
  • the uncompressed payload stored in the dictionary 350 is determined.
  • the compressor 200 can restore the original packet received from the server 100 and the equivalent packet in terms of transmission, accordingly the decompressor 300 according to an embodiment of the present invention is restored
  • the packet may be sent to the client 400.
  • the decompressor 300 is in normal mode with respect to the compressor 200. By transmitting a signal for requesting the switch to be able to receive a packet including the uncompressed payload from the compressor 200.
  • the compressor 200 and the decompressor 300 connected to the entry and exit ends of the backbone 15 on the communication network 10 between the server 100 and the client 400, respectively.
  • the compressor 200 compresses the payload containing the data constituting the content, and transmits the packet including the compressed payload to the decompressor 300, and the decompressor 300 is the compressor.
  • the compressed payload included in the packet received from the 200 is compared with the compressed payload stored in the dictionary 350 to be included in the packet received from the compressor 200 in the dictionary 350 of the user. It is determined whether the uncompressed payload corresponding to the compressed payload is stored.
  • the client uses the uncompressed payload to store the client using the uncompressed payload.
  • the packet to be transmitted to the client may be restored and the restored packet may be transmitted to the client 400.
  • the packet transmitted to the client 400 after the server 100 is decompressed and passed through the compressor 200 and the decompressor 300 has no compressor 200 and the decompressor 300 in terms of transmission.
  • the same situation, that is, the same situation as there was no system corresponding to the present invention may be the same, in this case the processing for the handover occurring in the client 400 can be made by the basic wireless communication mechanism. .
  • FIG. 5 is a diagram exemplarily illustrating a process of supporting handover in a compression mode according to an embodiment of the present invention.
  • the compressor 200 transmits the uncompressed content. Therefore, even if the client 400 is handed over to a communication network connected to the second decompressor 300B or to a communication network not connected to any decompressor, the compressor 200 continues to compress to the normal mode. Will not send content.
  • the content is stored in the dictionary 350A of the first decompressor 300A of the first communication network 20A before the handover, so that the transmission mode is the compression mode. If the corresponding content is also stored in the dictionary 350B of the second decompressor 300B of the second communication network 20B after the handover, the compressor 200 is compressed by maintaining the transmission mode in the compressed mode. The content may be continuously transmitted to the second decompressor 300B.
  • the transmission mode since the content is stored only in the dictionary 350A of the first decompressor 300A of the first communication network 20A before the handover, the transmission mode was the compression mode and after the handover.
  • the second decompressor 300B transmits the session to the compressor 200.
  • the request signal for switching the mode to the normal mode may be transmitted, and the compressor 200 may transmit the uncompressed content to the second decompressor 300B by switching the transmission mode from the compressed mode to the normal mode.
  • the compressor may detect that the packet transmitted from the client 400 does not go through the decompressor and switch the transmission mode from the compressed mode to the normal mode to directly transmit the uncompressed content to the client 400.
  • the compressor 200 when the transmission mode is the compression mode, the compressor 200 is an option field (Option) of the TCP header (Transmission Control Protocol Header) of the packet to the compressed content is not the payload portion of the packet Field) to send.
  • option field Option
  • TCP header Transmission Control Protocol Header
  • the compressor 200 may retransmit the packet received from the server 100 to the decompressor 300 without compressing.
  • the compressor 200 when the transmission mode is switched from the normal mode to the compression mode in response to receiving the switch signal from the decompressor 300 to the compression mode, the compressor 200 is the server 100 Compresses the received content using a predetermined compression algorithm and stores the compressed content in the option field of the TCP header of the packet (i.e., mounts it) and leaves the payload portion of the packet empty to include the compressed content.
  • the packet may be generated, and the packet generated as described above may be transmitted to the decompressor 300, and the original packet may be generated from the uncompressed content stored in the dictionary 350 of the decompressor 300. Meta information (eg, compressed MD5 signature information, protocol information, etc.) necessary to recover may be further transmitted to the decompressor 300.
  • the decompressor 300 compares the compressed content stored in its dictionary 350 with the compressed content loaded in the option field of the TCP header of the packet transmitted from the compressor 200 to correspond to the compressed content transmitted from the compressor 300. It is possible to determine whether the compressed content is stored in the dictionary 350 of the user.
  • the compressor 200 can restore the original packet received from the server 100 and an equivalent packet in terms of transmission, and accordingly another embodiment of the present invention.
  • the decompressor 300 may transmit the recovered packet to the client 400.
  • the transmission mode was the compression mode and after the handover. If the content is similarly stored in the dictionary of the second decompressor 300B of the second communication network 20B, the compressor 200 compresses the option field portion of the TCP header by maintaining the transmission mode in the compression mode. The packet on which the loaded content is loaded can be continuously transmitted to the second decompressor 300B.
  • the content is stored only in the dictionary 350A of the first decompressor 300A of the first communication network 20A before the handover, so that the transmission mode was the compression mode. If the content is not stored in the dictionary 350B of the second decompressor 300B of the second communication network 20B after the handover, the second decompressor 300B corresponds to the compressor 200.
  • the request signal may be transmitted to switch the transmission mode of the session to the normal mode, and the compressor 200 decompresses a packet including the uncompressed content in the payload by switching the transmission mode from the compressed mode to the normal mode, in a second manner. To 300B.
  • the content is stored only in the dictionary 350A of the first decompressor 300A of the first communication network 20A before the handover, so that the transmission mode was the compression mode. If the decompressor is not present in the third communication network 20C after the handover, the packet including the compressed content, that is, the compressed content is included in the option field part of the TCP header and the payload part is included in the content. Packets that do not contain relevant data may be sent directly to the client 400. Not only does the payload not exist in the packet sent to the client 400, but the compressed content of the optional field portion of the TCP header of the packet sent to the client 400 can be ignored if it cannot be interpreted by the client 400. Can be.
  • the client 400 may transmit a request (or message) to the server 100 to retransmit the packet through the TCP session established between the client 400 and the server 100.
  • the compressor 200 can check the situation of the TCP session established between the client 400 and the server 100, the compressor 200 requests a packet retransmission transmitted from the client 400.
  • the decompressor does not exist in the second communication network to which the client 400 belongs, it is possible to switch the transmission mode from the compressed mode to the normal mode.
  • the compressor 200 may retransmit the packet received from the server 100 to the client 400 without compressing the packet.
  • a plurality of compressors in a content delivery system exist because a packet needs to be transmitted to a specific decompressor in order to transmit a packet to a specific client, and a packet is transmitted to a specific compressor in order to transmit a packet to a specific server.
  • the decompressor existing in the transmission path can receive the packet and perform necessary processing, on the contrary, the decompressor transmits the packet.
  • the compressor in the transmission path can receive the packet and perform necessary processing. If necessary, a tunnel formed between the compressor and the decompressor can support packet transmission. The burden incurred in the prior art can be eliminated.
  • the decompressor 300 stores the content received from the server 100 in the dictionary 350, and if it is transmitted from the server 100. If all parts of the content to be stored in the dictionary 350 of the decompressor 300, the content that the decompressor 300 itself is stored in the dictionary 350 without having to receive the content from the server 100 Using to transmit the content to the client 400. In the present invention, such a transmission mode will be referred to as a "caching mode".
  • FIG. 6 is a diagram illustrating a process of transmitting content in a caching mode according to an embodiment of the present invention.
  • the compressor 200 may have information about whether the decompressor 300 is located in each lower communication network to which the client 400 belongs. Since the packet transmitted from the client 400 to the server 100 via the decompressor 300 necessarily passes through the compressor 200, the compressor 200 uses the information obtained from the packet to obtain the client 400. It is possible to find out whether the decompressor 300 exists in the lower communication network to which the.
  • the compressor 200 transmits a packet including data constituting the content from the server 100 as payload (actual data.
  • a packet is composed of a packet header and a payload). I can receive it.
  • the compressor 200 and the server 100 do not establish a TCP connection at the transport layer, but the compressor 200 receives datagram packets from the server 100 at the network layer.
  • the compressor 200 may retransmit the packet received from the server 100 to the decompressor 300 without compressing the packet (FIG. 6A). ) Reference).
  • the compressor 200 may generate a compressed packet by compressing the payload of the packet received from the server 100 using a predetermined compression algorithm.
  • the compressor 200 may transmit the compressed packet generated as described above to the decompressor 300, and together with the decompressed payload in which the decompressor 300 is stored in its dictionary 350.
  • Decompresses meta information eg, compressed MD5 signature information, protocol information, etc.
  • meta information eg, compressed MD5 signature information, protocol information, etc.
  • compression algorithms such as Message Digest 4 (MD4) and Message Digest 5 (MD5) may be exemplified (see FIG. 6B). ).
  • the compressor 200 in the caching mode, if the compressor 200 is receiving content from the server 100, the server 100 transmits a connection blocking signal RST to the server 100 to connect with the server 100. 6, the compressor 200 may terminate the tunnel if the compressor 200 is receiving content from another decompressor 300 through the tunnel.
  • the compressor 200 may manage the information of the client 400 and the decompressor 300 connected to each other in the corresponding session, whereby the client 400 of the corresponding session It is possible to detect whether a handover occurs.
  • the compressor 200 refers to the transmission mode switch request signal from the decompressor 300 or whether the packet transmitted from the client 400 passes through the decompressor 300. With reference to the information about, it is possible to perform a function suitable for each of the normal mode, the compression mode, and the caching mode. More specifically, according to an embodiment of the present invention, the compressor 200 compresses and transmits content from the decompressor 300 or transmits from the decompressor 300 in response to receiving the request to switch to the compressed mode. The content transmission may be stopped as the request for switching to the caching mode is received.
  • the fact that the packet transmitted from the client 400 has reached the compressor 200 without passing through the decompressor 300 indicates that the client 400 has resulted in a handover.
  • the compressor 200 may set the current transmission mode to the normal mode because the signal 400 is no longer connected to the decompressor 300 to perform decompression.
  • the compressor 200 uses the tunneling technique to allow the client 400 to perform the handover.
  • the tunnel to the first decompressor 300A connected before the handover may be opened.
  • the compressor 200 may transmit a packet (that is, a packet related to a content request) received from the client 400 to the first decompressor 300A through a tunnel, and correspondingly, the first decompressor ( 300A may transmit a packet in response to a request from the client 400 to the compressor 200 via a tunnel.
  • a packet tunneled from the first decompressor 300A and transmitted to the compressor 200 through a tunnel formed between the first decompressor 300A and the compressor 200 may be transferred to the second decompressor 300B or the like. It may be sent to the handed over client 400.
  • the client 400 continuously extracts the cached content from the decompressor 300A that was connected before the handover occurred. It may be transmitted through 300B or directly (see (d), (e) or (f) of FIG. 6).
  • the first compression that was connected with the client 400 before the handover may be transmitted to the client 400 via the compressor 200.
  • the second decompressor 300B when the second decompressor 300B exists between the compressor 200 and the handed over client 400, the client 400 has been connected before the handover.
  • a tunneled packet from the first decompressor may be transmitted to the client 400 via the compressor 200 and the second decompressor 300B in sequence.
  • the decompressor 300 may retransmit to the compressor 200 without any processing for the packet transmitted from the client 400.
  • the decompressor 300 when the decompressor 300 receives a packet including an uncompressed payload from the compressor 200, the decompressor 300 includes meta, such as content type, content length, and URL transmitted in the corresponding session. Information can be managed. More specifically, whether the session proceeds from the beginning may be determined by referring to the SYN number of the packet transmitted from the compressor 200. When the determination result, the decompressor 300 determines that the packet Search the payload to extract and manage meta information such as content type, content length, URL, and the like, and if the session is in progress from the middle, request the meta information about the session from the compressor 200. It can be delivered and managed.
  • the decompressor 300B when the decompressor 300B receives a packet including an uncompressed payload from another decompressor 300A, the content type and content length transmitted in the corresponding session. Meta information such as URLs can be managed. More specifically, whether or not the session proceeds from the beginning may be determined by referring to the SYN number of the packet transmitted from the other decompressor 300A. When the determination results, the decompressor 300B is performed. ) retrieves the payload of the packet and extracts and manages meta information such as content type, content length, URL, and the like. When the session is in the middle, the decompressor 300A is connected to the corresponding session. You can request meta-information about it and receive and manage it.
  • the decompressor 300 when the decompressor 300 receives a packet including an uncompressed payload from the compressor 200, the decompressor 300 examines the dictionary 350 which is a data store and pays the payload of the packet. It may be determined whether is stored in the dictionary 350. In addition, according to an embodiment of the present invention, the decompressor 300 may record the number of consecutive transmissions of uncompressed packets having payloads that are already stored in the dictionary in a session with the compressor 200. . As a result, if the number of times that the packet received by the decompressor 300 from the compressor 200 in the particular session is continuously stored in the dictionary 350 of the decompressor 300 is greater than or equal to the preset first threshold value. The decompressor 300 may determine that the content transmitted through the session is already stored in the dictionary 350. Accordingly, the decompressor 300 switches the compressor 200 to the compression mode. The request signal can be transmitted.
  • the number of times that the packet received from the compressor 200 by the decompressor 300 is continuously stored in the dictionary 350 of the decompressor 300 is the second threshold. If the value is greater than or equal to, that is, the content transmitted through the session and the content stored in the dictionary 350 continuously match the predetermined level or more, and the meta information about the session meta information and the current content stored in the dictionary 350 is displayed. If it is determined that the entire content of the current content is stored in the dictionary 350 without any omission, the decompressor 300 may transmit a signal requesting the compressor 200 to switch to the caching mode.
  • the decompressor 300 may transmit the content stored in the dictionary 350 to the client 400 without having to receive the content from the server 100.
  • the signal for requesting the switch to the caching mode there may be connection information of the client 400 of the session, that is, information about an IP address and a TCP port, and the transmission of content is completed. Thereafter, the transmission termination signal FIN may be transmitted to the client 400.
  • the second threshold value as the reference for the switch to the caching mode may be set larger than the first threshold value as the reference for the switch to the compressed mode.
  • the first decompressor (which was connected with the client 400 before the handover) ( A packet from 300A may be sent to the second decompressor 300B, which is connected to the client after handover via the compressor 200, in which case the first decompressor 300A has a handover.
  • the client instead of transmitting the packet to the communication network before, instead of routing the packet in response to the packet from the client 400 (that is, the packet related to the content request) received from the tunnel established by the compressor 200, the client switches to the corresponding tunnel. Packets responsive to packets from 400 may be sent.
  • the first decompressor 300A opens a tunnel in response to a request of the compressor 200 or in response to a request of the second decompressor 300B received through the tunnel. Meta information of the content may be transmitted to the compressor 200 through the content.
  • the second decompressor 300B may determine the payload.
  • the load is compressed using a predetermined compression algorithm (e.g., MD4, MD5, etc.), and a pair of pairs in which the compressed payload and the uncompressed payload are key and value, respectively. It can be stored in the dictionary 350B in the form.
  • the dictionary 350 according to an embodiment of the present invention can manage the payload for each content and store the metadata in association with the meta information of each content. In some cases, since one payload may be shared among multiple contents, the dictionary 350 may manage the payloads stored so that they do not overlap each other. In this case, a method of allowing one payload, which is physically stored in the dictionary 350, to refer to a plurality of contents may be utilized.
  • the decompressor 300 when the decompressor 300 receives a packet including the compressed payload from the compressor 200, the decompressor 300 checks the dictionary 350 which is a data store. It may be determined whether a payload matching the compressed payload is stored in the dictionary 350. As a result of the determination, if the compressed payload included in the received packet is stored in the dictionary 350, the decompressor 300 uses the payload stored in the dictionary 350 and meta information necessary for reconstruction.
  • the original packet corresponding to the packet received from the server 100 that is, the compressor 200 generates an original packet that is equivalent to the original packet received from the server 100 and transmits the same to the client 400. .
  • the decompressor 300 decompresses the compressor 200 in the normal mode. By transmitting a signal requesting a switch, it is possible to receive a packet including an uncompressed payload from the compressor 200.
  • FIG. 7 is a diagram illustrating a process of supporting handover in a caching mode according to an embodiment of the present invention.
  • the second decompressor 300B receives the payload of the packet transmitted through tunneling 30A from the first decompressor 300A of the second decompressor 300B.
  • the payload stored in the dictionary 350B may be compared with the payload stored in the dictionary 350B to determine whether the payload is stored in the dictionary 350B.
  • the first decompressor 300A may generate a compressed packet by compressing content stored in its dictionary 350A by using a predetermined compression algorithm, and generating the compressed packet as described above.
  • the decompressor 300B can be sent to the decompressor 300B, together with the second decompressor 300B from the server 100 to the compressor 200 using the uncompressed content stored in its dictionary 350B. Meta information necessary to recover the original packet and the same packet in terms of transmission may be further transmitted to the second decompressor 300B (see (e) of FIG. 6).
  • the content is transmitted from the first decompressor 300A to the compressor 200 through a tunnel, and the content is transferred back to the second decompressor 300B from the compressor 200. Since the compressed content can be transmitted even in the case of transmission, the traffic of the backbone can be reduced even when the content is transmitted through the tunnel after the handover.
  • the decompressor 300A may transmit a signal for requesting the switch to the caching mode. Accordingly, the compressor 200 causes the tunnel between the first decompressor 300A and the compressor 200 to be terminated and the client ( The decompressor communicating with 400 may be reflected in the management state that the decompressor changed from the first decompressor 300A to the second decompressor 300B. That is, the client 400 receives cached content stored in the dictionary 350B of the second decompressor 300B and no longer receives content from the first decompressor 300A.
  • the content is transmitted through the tunnel 30A established for the decompressor before the handover and continuously transmitted over a predetermined threshold. If the matched content matches the content stored in the decompressor's dictionary after the handover, the decompressor after the handover switches to caching mode, transferring the content from the decompressor after the handover, and decompressing the handover. The process of stopping content transmission from the device may be repeated.
  • the content is passed through the tunnel 30B established for the decompressor connected to the client 400 before the handover from the compressor 200.
  • the transmission is made.
  • Embodiments according to the present invention described above can be implemented in the form of program instructions that can be executed by various computer components and recorded on a computer-readable recording medium.
  • the computer-readable recording medium may include program instructions, data files, data structures, etc. alone or in combination.
  • Program instructions recorded on the computer-readable recording medium may be those specially designed and configured for the present invention, or may be known and available to those skilled in the computer software arts.
  • Examples of computer-readable recording media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs, DVDs, and magneto-optical media such as floptical disks. media), and hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, and the like.
  • Examples of program instructions include not only machine code generated by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.
  • the hardware device may be configured to operate as one or more software modules to perform the process according to the invention, and vice versa.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon un des aspects de la présente invention, le procédé de transmission de contenus prenant en charge un transfert consiste à : (a) compresser, au niveau d'un compresseur, le contenu transmis provenant d'un serveur et transmettre le contenu compressé à un décompresseur si une demande de changement du mode de compression est reçue ; (b) et transmettre, au niveau d'un compresseur, le contenu transmis provenant d'un serveur sans compression à un client ou à un autre décompresseur connecté au client après un transfert si le transfert se produit au niveau du client.
PCT/KR2013/002916 2012-05-16 2013-04-08 Procédé de transmission de contenus et système prenant en charge un transfert, et support d'enregistrement lisible par ordinateur WO2013172552A1 (fr)

Priority Applications (1)

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US14/401,402 US20150133120A1 (en) 2012-05-16 2013-04-08 Method, system and computer-readable recording medium for transmitting contents with supporting hand-over

Applications Claiming Priority (4)

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KR20120052161 2012-05-16
KR10-2012-0052161 2012-05-16
KR10-2012-0108307 2012-09-27
KR1020120108307A KR101432719B1 (ko) 2012-05-16 2012-09-27 핸드오버를 지원하는 컨텐츠 전송 방법, 시스템 및 컴퓨터 판독 가능한 기록 매체

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Citations (4)

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Publication number Priority date Publication date Assignee Title
KR100742868B1 (ko) * 2000-07-27 2007-07-26 텔레폰악티에볼라겟엘엠에릭슨(펍) 이동 데이터 통신망에서의 핸드오버 동안의 헤더 압축문맥 제어 방법
KR20080084928A (ko) * 2005-12-19 2008-09-22 톰슨 라이센싱 네트워크 내에 독립적인 압축 서버를 제공하는 것, 그방법, 네트워크 스테이션 및 ｄｈｃｐ 서버
KR20090119709A (ko) * 2008-05-16 2009-11-19 포스데이타 주식회사 Ａｓｎ간 핸드오버 처리 방법 및 그 방법을 지원하는 ａｓｎ-ｇｗ
KR20110026291A (ko) * 2009-09-07 2011-03-15 삼성전자주식회사 무선통신시스템에서 로버스트 헤더 압축을 지원하기 위한 시스템 및 방법

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100742868B1 (ko) * 2000-07-27 2007-07-26 텔레폰악티에볼라겟엘엠에릭슨(펍) 이동 데이터 통신망에서의 핸드오버 동안의 헤더 압축문맥 제어 방법
KR20080084928A (ko) * 2005-12-19 2008-09-22 톰슨 라이센싱 네트워크 내에 독립적인 압축 서버를 제공하는 것, 그방법, 네트워크 스테이션 및 ｄｈｃｐ 서버
KR20090119709A (ko) * 2008-05-16 2009-11-19 포스데이타 주식회사 Ａｓｎ간 핸드오버 처리 방법 및 그 방법을 지원하는 ａｓｎ-ｇｗ
KR20110026291A (ko) * 2009-09-07 2011-03-15 삼성전자주식회사 무선통신시스템에서 로버스트 헤더 압축을 지원하기 위한 시스템 및 방법

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