WO2006001137A1 - データ通信システム、サーバ装置及びデータ通信方法並びにそのプログラム - Google Patents
データ通信システム、サーバ装置及びデータ通信方法並びにそのプログラム Download PDFInfo
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- WO2006001137A1 WO2006001137A1 PCT/JP2005/009031 JP2005009031W WO2006001137A1 WO 2006001137 A1 WO2006001137 A1 WO 2006001137A1 JP 2005009031 W JP2005009031 W JP 2005009031W WO 2006001137 A1 WO2006001137 A1 WO 2006001137A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/04—Protocols for data compression, e.g. ROHC
Definitions
- the present invention relates to a data communication system, a server device, a data communication method, and a program therefor, and more particularly to a data communication system that reuses data communicated in the past during communication.
- this type of data communication system includes a server 3, a client 4, and a network 100 that connects the server 3 and the client 4. There is a data communication system.
- the server 3 includes a communication unit 31 having a function of communicating with the client 4 via the network 100, a data transmission processing unit 32 having a function of transmitting data upon receiving a data request from the client 4, and the server 3 It is composed of a data acquisition unit 33 having a function of acquiring data corresponding to a specified resource ID among data stored inside.
- the resource ID is an identifier used for designating data required by the client 4 in the data request.
- the resource ID is associated with specific data. Yes.
- data associated with resource IDs may change over time, or data associated with resource IDs may be dynamically generated.
- the data associated with the resource ID is outside the server 3 inside the server 3, and the data acquisition unit 33 acquires the data via the network 100.
- the client 4 has a communication unit 41 having a function of communicating with the server 3 via the network 100, and a data reception function having a function of requesting the data to the server 3 in response to a user request or the like and acquiring the data.
- the processing unit 42 is configured to request data from the server 3 and receive data from the server 3 based on a user instruction or the like.
- the data reception processing unit 42 receives necessary data resources based on a request from a user or the like.
- a data request message including the source ID is transmitted to the server 3 by the communication unit 41.
- the data transmission processing unit 32 of the server 3 receives the data request message through the communication unit 31.
- the data transmission processing unit 32 acquires the data corresponding to the resource ID of the data specified in the data request message from the data acquisition unit 33, and sends a data response message including the data to the request source by the communication unit 31. Send to client 4.
- the data reception processing unit 42 receives the data response message and acquires data in the data response message. Through the above processing, the client 4 obtains necessary data from the server 3.
- FIG. 10 As an example of a system that takes this data amount reduction into consideration, as shown in FIG. 10, as shown in FIG. There is a communication system.
- the server 5 includes a communication unit 51 having a function of communicating with the client 6 via the network 100, a data transmission processing unit 52 having a function of transmitting data upon receiving a data request from the client 6, and the server 5 Two types of data: a data acquisition unit 53 that has a function of acquiring data corresponding to a specified resource ID among data stored inside, and a cache storage unit 54 that has a function of storing data transmitted in the past And a difference information generating unit 55 having a function of generating difference data from.
- the data acquisition unit 53 identifies the data at the time of data acquisition in addition to the function of acquiring data associated with the resource ID. It has a function to assign a data ID for this purpose.
- the data ID is unique in the data group associated with the same resource ID, and when multiple data have the same resource ID and the same data ID, it is guaranteed that the contents of these data are the same.
- the client 6 stores the communication unit 61, the data reception processing unit 62, and the data received in the past.
- the cache storage unit 63 has a function of storing data
- the information restoration unit 64 has a function of restoring data used for difference generation from difference data.
- data transmitted and received in the past is stored together with its resource ID and data ID.
- An example of data stored in the cache storage unit 54 is shown in FIG. 11, and an example of data stored in the cache storage unit 63 is shown in FIG. In these examples, data is stored as a set of resource ID, data ID, and data content.
- the data reception processing unit 62 passes a data request message including the resource ID of the required data based on a request from the user or the like! The data is transmitted to the server 5 by the communication unit 61. However, at that time, the data reception processing unit 62 refers to the cache storage unit 63, checks whether there is data corresponding to the requested resource ID, and if there is data corresponding to the resource ID, the data ID of that data Is included in the data request message.
- the data transmission processing unit 52 of the server 5 receives the data request message through the communication unit 51.
- the data transmission processing unit 52 acquires the data corresponding to the resource ID of the data specified in the data request message from the data acquisition unit 53, and assigns the data ID. If the data request message contains a data ID! /, The data transmission processing unit 52 generates a data response message including the data and the data ID, and transmits the data response message to the client 6 by the communication unit 51. .
- the data transmission processing unit 52 uses the differential information generation unit 55 to Then, a difference between the data acquired by the data acquisition unit 53 and the data in the cache storage unit 54 is generated, a data response message including the difference data is generated, and transmitted to the client 6 by the communication unit 51.
- the data transmission processing unit 52 displays the data and the data ID.
- a data response message including the message is generated and transmitted to the client 6 by the communication unit 51.
- the data reception processing unit 62 of the client 6 receives the data response message.
- the data reception processing unit 62 acquires the data as it is.
- the data reception processing unit 62 is used by the information restoration unit 64 to generate a difference from the differential data and the data having the data ID specified at the time of the request in the cache storage unit 63. Restore and acquire the original data.
- the client 6 obtains necessary data from the server 5.
- the data transmission processing unit 52 and the data reception processing unit 62 store the data in the cache storage unit 54 together with the resource ID and the data ID, respectively, based on arbitrary rules in the course of the above processing. .
- Patent Document 1 Japanese Patent Application Laid-Open No. 2000-194613
- Non-patent document 1 "Delta encoding in HTTP", RFC 32 29, January 2002 Disclosure of invention
- An object of the present invention is to solve the above-described problems and to reduce the amount of communication even when the data request target by the client is not the same, a data communication system, a server device, a data communication method, and its To provide a program.
- a data communication system is a data communication system for transmitting data from Sano to a client
- First cache storage means for storing data communicated in the past as cache data
- means for generating and transmitting differential data between the transmission data and the cache data stored in the first cache storage means when transmitting the transmission data to the client
- the second cache storage means for storing data communicated in the past as cache data, the means for receiving data from the server, the difference data, and the cache data stored in the second cache storage means A means for restoring the transmission data, provided in the client;
- the cache data is stored in the same state in the first cache storage means and the second cache storage means.
- the server device is a server device for transmitting data to a client, and stores first cache storage means for storing data communicated in the past as cache data, and when transmitting transmission data to the client. Means for generating and transmitting differential data between the transmission data and the cache data stored in the first cache storage means,
- the differential data is for restoring the transmission data from the cache data stored in the second cache storage means of the client that stores the previously communicated data as cache data;
- the cache data is stored in the same state in the first cache storage means and the second cache storage means.
- a data communication method is a data communication method for transmitting data from a Sano to a client
- the server and the client store the previously communicated data in the same state as cache data in the first cache storage means of the server and the second cache storage means of the client, respectively.
- the server When the server transmits transmission data to the client, the server generates and transmits differential data between the cache data stored in the first cache storage means and the transmission data, and the client Stored in the second cache storage means. The transmission data is restored from the cached data.
- a program for a data communication method is a program for a data communication method for transmitting data from a Sano to a client.
- the previously transmitted data is stored in the same state as cache data, and the transmission data is restored from the cache data stored in the second cache storage means of the client.
- the difference information generation / comparison unit when the server transmits the requested data, the difference information generation / comparison unit generates a difference between the transmission target data and all the cache data in the cache storage unit, The difference data of the minimum size is transmitted together with the cache data identifier, and the cache data in the cache storage unit is updated.
- the client restores the difference data received from Sano and the cache data and the cache data in the cache storage unit associated with the cache identifier, and the cache data in the cache storage unit is stored in the server Update using the same method.
- the present invention has the effect of reducing the amount of communication even when the data request target by the client is not the same.
- FIG. 1 is a block diagram showing a configuration of a data communication system according to an embodiment of the present invention.
- a data communication system according to an embodiment of the present invention includes a server 1, a client 2, and a network 100 that connects the server 1 and the client 2.
- the power of client 2 as a single unit
- Multiple clients 2 connect to server 1 via network 100. It may be continued.
- the network 100 implements communication between the server 1 and the client 2, such as the Internet.
- Any communication protocol may be used for communication on the network 100 between the server 1 and the client 2.
- standardized protocols such as HTTP (Hypertext Transfer Protocol) and SIP (Session Initiation Protocol) may be used, or a proprietary protocol may be used.
- the client 2 has a function of acquiring from the server 1 via the network 100 the data specified by the user or the external program power.
- Server 1 has a function of transmitting data designated by client 2 to client 2 via network 100.
- Server 1 includes communication unit 11, data transmission processing unit 12, data acquisition unit 13, cache processing unit 14, cache storage unit 15, difference information generation / comparison unit 16, and data storage unit 17. And a recording medium 18.
- the communication unit 11 communicates with the client 2 via the network 100, and the data transmission processing unit 12 transmits data in response to a request from the client 2.
- the data acquisition unit 13 acquires data based on the designation of the identifier, and the cache processing unit 14 performs processing for adding, deleting, and changing data in the cache storage unit 15.
- the cache storage unit 15 stores data that has been a communication target in the past. Difference information generation
- the comparison unit 16 determines whether or not the communication efficiency can be improved by generating difference data of two data forces and transmitting the difference.
- the data storage unit 17 stores data.
- the recording medium 18 stores a program (a computer-executable program) for realizing processing of each unit of the server 1.
- a program a computer-executable program
- the server 1 includes a CPU (central processing unit) and a RAM (random access memory)
- the CPU moves the program of the recording medium 18 to the RAM and executes it, so that the entire server 1 is executed. Control and various processing operations.
- the data acquisition unit 13 has a function of providing data in response to a request accompanied by designation of an identifier.
- the format of the identifier may be any format as long as the data acquisition unit 13 can recognize it.
- An example of an identifier format is URI (Uniform Resource Indicator) There is.
- the data acquisition unit 13 When the data acquisition unit 13 receives a request for data, the data acquisition unit 13 acquires data corresponding to the identifier with reference to the data storage unit 17, and outputs the data. Note that the data acquisition unit 13 uses data stored in an arithmetic device such as a computer connected to the server 1 via the network 100 that includes only the data in the data storage unit 17 in the server 1 as a data acquisition target. May also be included.
- an arithmetic device such as a computer connected to the server 1 via the network 100 that includes only the data in the data storage unit 17 in the server 1 as a data acquisition target. May also be included.
- the identifier also includes information for identifying the arithmetic device on the network 100, and the data acquisition unit 13 acquires the specified data from within the arithmetic device specified by the identifier.
- the association between the identifier and the data may change with time.
- the data associated with the identifier may be dynamically generated when requested.
- the client 2 includes a communication unit 21, a data reception processing unit 22, an input / output unit 23, a cache processing unit 24, a cache storage unit 25, an information restoration unit 26, and a recording medium 27. ing.
- the communication unit 21 communicates with the server 1 via the network 100, and the data reception processing unit 22 acquires data from the server 1 based on a request via the input / output unit 23.
- the input / output unit 23 performs input / output with a user or an external program.
- the cache processing unit 24 pursues data in the cache storage unit 25! ], Delete, change.
- the cache storage unit 25 stores data that has been subject to communication in the past.
- the information restoration unit 26 restores the original data from the difference data.
- the recording medium 27 stores a program (program executable by a computer) for realizing the processing of each unit of the client 2.
- program program executable by a computer
- the client 2 includes a CPU and RAM
- the CPU moves the program of the recording medium 27 to the RAM and executes it, thereby executing control of the entire client 2 and various processing operations. Can do.
- the difference information generation / comparison unit 16 has a function of generating difference data D from data A and B.
- the result of subtracting the size of differential data D from the size of data A is called the size reduction from data A.
- the information restoration unit 26 converts the data A from the difference data D and the data B. It has a function to generate.
- any algorithm can be used as long as the information restoration unit 26 can correctly restore information. Use it!
- the data transmission processing unit 12 transmits data to the client 2 in the past.
- the data storage processing unit 25 stores the data received from the server 1 in the past by the data reception processing unit 22, respectively. Is stored as
- the cache storage unit 15 and the cache storage unit 25 are in a state where no cache data is stored.
- Data processing such as addition, deletion, and modification of data in the cache storage unit 15 is performed by the cache processing unit 14, and data processing such as addition, deletion, and modification of data in the cache storage unit 25 is performed by the cache processing unit 24. , Respectively.
- the cache processing unit 14 and the cache processing unit 24 execute various data processing so that the contents of the data stored in the cache storage unit 15 and the cache storage unit 25 are in the same state.
- the cache storage section 15 has a cache data storage area corresponding to each client 2, and the contents of each are the contents of the cache storage section 25 of the corresponding client 2. Will be in the same state.
- FIGS. 2A and 2B are diagrams showing examples of data in the cache storage unit 15 of the server 1 in FIG. 2A and 2B, the cache storage unit 15 manages cache data corresponding to a plurality of clients 2 (client identifiers “00001” and “00002”).
- the cache data is managed in the cache storage unit 15 together with an identifier for identifying the data. This identifier is managed by the cache processing unit 14.
- Fig. 2 (a) is an example of cache data corresponding to client 2 identified by client identifier "00001”
- Fig. 2 (b) is cache data corresponding to client 2 identified by client identifier "00002”. It is an example.
- FIG. 3 is a diagram showing an example of data in the cache storage unit 25 of the client 2 in FIG.
- the client 2 identified by the client identifier “00001” shown in FIG.
- An example of corresponding cache data is shown.
- the contents of the cache data stored in the server 1 and the client 2 are the same.
- FIG. 4 is a sequence chart showing the operation of the data communication system according to the embodiment of the present invention
- FIG. 5 is a flowchart showing the data communication processing in the client 2 of FIG. 1
- FIG. 6 is a flowchart showing data communication processing in the server 1 of FIG.
- FIG. 7 is a flowchart showing the determination process in the server 1 in FIG. 1
- FIG. 8 is a flowchart showing the data communication process in the client 2 in FIG.
- the operation of the data communication system according to the embodiment of the present invention will be described with reference to FIGS.
- the processes shown in FIGS. 5 to 8 are realized by the CPUs of the server 1 and the client 2 executing the programs of the recording media 18 and 27.
- each of (1) client process # 1, (2) server process, and (3) client process # 2 processes is performed by server 1. And the power executed by the client 2
- the operation of the data communication system according to the embodiment of the present invention will be described by dividing it into these three processes.
- Client process # 1 is executed by the data reception processing unit 22 of client 2 (al, a2 in FIG. 4) G That is, the data reception processing unit 22 is sent from the request source by the input / output unit 23.
- a request for data is received (step Sl in FIG. 5). This request includes information about the required data.
- examples of the request source include a user of the client 2 and an external computing device (not shown) connected to the client 2.
- the data reception processing unit 22 extracts the required data identifier from the request input from the input / output unit 23, generates a data request message including the identifier, and the communication unit 21 uses the server Send to 1 (step S2 in Fig. 5).
- client 2 sends a data request message to server 1 (a3 in FIG. 4).
- the server process is executed by the data transmission processing unit 12 of the server 1 (a4 in FIG. 4) o That is, the data transmission processing unit 12 receives the data request message from the client 2 by the communication unit 11. (Step S11 in Fig. 6). The data transmission processing unit 12 extracts an identifier of data required by the client 2 included in the data request message from the client 2, and acquires data associated with the identifier by the data acquisition unit 13 ( Figure 6 Step S12).
- the acquired data that is, the data requested by the client 2 is referred to as original data.
- the data transmission processing unit 12 uses the difference information generation / comparison unit 16 to determine whether or not communication efficiency can be improved by performing difference transmission in transmission of original data (step S13 in FIG. 6).
- the difference information generation / comparison unit 16 generates difference data from the original data for all the cache data stored in the cache storage unit 15 (step S21 in FIG. 7).
- cache data corresponding to a plurality of clients 2 is stored in the cache storage unit 15, only the cache data corresponding to the client 2 that is the data request source is the target of differential information generation.
- the difference information generation / comparison unit 16 selects the one having the smallest medium size of the generated difference data. Hereinafter, this difference data is referred to as minimum difference data.
- the difference information generation / comparison unit 16 calculates the size reduction amount by subtracting the size of the minimum difference data from the size of the original data (step S22 in FIG. 7).
- the difference information generation / comparison unit 16 checks whether or not the size reduction amount calculated by the above processing is equal to or greater than a predetermined threshold (step S23 in FIG. 7).
- the predetermined threshold is a unique value determined by server 1.
- the threshold value shall be set with Sano 1 in advance in consideration of the communication overhead during transmission of differential data.
- An example of the threshold value is “0”, for example.
- the difference information generation / comparison unit 16 sets the determination result to "possible", and is used to generate the minimum difference data and the minimum difference data together with the determination result.
- the identifier in the cache storage unit 15 for cache data is output (step S24 in FIG. 7).
- the difference information generation / comparison unit 16 sets the determination result to “impossible” and outputs the determination result (step S25 in FIG. 7).
- the above processing is executed by the difference information generation / comparison unit 16 in step S13.
- the above procedure is It is an example of a determination method and does not limit the determination method.
- the data transmission processing unit 12 obtains the determination result from the difference information generation / comparison unit 16 and also acquires the information when there is information accompanying the determination result.
- the data transmission processing unit 12 checks whether or not the determination result from the difference information generation / comparison unit 16 is “possible” (step S14 in FIG. 6). When the determination result is “possible”, the data transmission processing unit 12 generates a data response message including the following information (step S15 in FIG. 6).
- the data transmission processing unit 12 obtains a difference flag (flag information that takes a value of “0” or “1”, where the value is set to “1”) and the difference information generation / comparison unit 16.
- a data response message is generated from the obtained minimum difference data and the cache identifier obtained from the difference information generation / comparison unit 16.
- the data transmission processing unit 12 If the determination result from the difference information generation / comparison unit 16 is not “possible”, the data transmission processing unit 12 generates a data response message having the following information power (step S 16 in FIG. 6).
- the data transmission processing unit 12 uses the difference flag (flag information taking a value of “0” or “1”. Here, the value is set to “0”) and the original data acquired by the data acquisition unit 13. Generate a data response message.
- the data transmission processing unit 12 transmits the data response message generated as described above to the client 2 through the communication unit 11 (step S17 in FIG. 6).
- the data transmission processing unit 12 updates the data content of the cache storage unit 15 by the cache processing unit 14 (step S18 in FIG. 6). If cache data corresponding to a plurality of clients 2 is stored in the cache storage unit 15, the cache data corresponding to the client 2 of the data request source is subject to update.
- the cache processing unit 14 adds or deletes cache data based on a predetermined algorithm.
- the cache processing unit 14 determines which data is added to the cache storage unit 15, which data is deleted from the cache storage unit 15, and how identifiers are assigned to cache data in the cache storage unit 15. Information on the processing performed by is defined.
- the processing contents of the above algorithm are uniquely determined, and any algorithm may be used as long as the same determination processing is possible on the client 2.
- the server 1 transmits a data response message to the client 2 and updates the cache data in the cache storage unit 15.
- Client process # 2 is executed by the data reception processing unit 22 of the client 2. That is, the data reception processing unit 22 receives a data response message from the server 1 through the communication unit 21 (step S31 in FIG. 8).
- the data reception processing unit 22 extracts the difference flag information from the data response message received from the server 1, and checks whether or not the difference flag has a value “1” (step S32 in FIG. 8). If the difference flag power is “l”, the data reception processing unit 22 restores the original data by the information restoration unit 26 (step S33 in FIG. 8).
- the information restoration unit 26 includes the difference data included in the data response message and the cache storage unit.
- the original data is restored from the cache data corresponding to the cache identifier included in the data response message among the cache data within 25.
- the data reception processing unit 22 acquires the original data included in the data response message (step S 34 in FIG. 8).
- the data reception processing unit 22 outputs the original data acquired by the above processing to the request source through the input / output unit 23 (step S35 in FIG. 8).
- the data reception processing unit 22 updates the data contents of the cache storage unit 25 by the cache processing unit 24 (step S36 in FIG. 8).
- the cache processing unit 24 adds and deletes cache data based on a predetermined algorithm.
- This algorithm uses the same algorithm used by the cache processing unit 14 of the server 1 for updating cache data in the above-described processing. Therefore, the cache data in the cache storage unit 15 and the cache data in the cache storage unit 25 at the end of updating of each cache data are in the same state.
- client 2 receives the data response message received from server 1.
- the cache data in the cache storage unit 25 can be updated and kept in the same state as the cache data in the cache storage unit 15.
- client 2 acquires necessary data from server 1.
- the update of the cache data by the cache processing unit 14 in the above step S18 and the update of the cache data by the cache processing unit 24 in the above step S36 are predetermined algorithms. It is assumed that it is executed according to However, let's assume that server 1 specifies the cache data update process.
- step S17 the data transmission processing unit 12 determines a cache data update method, and adds information on the update method to the data response message. Then, the cache processing unit 14 in the above step S18 executes the update of the cache data in the cache storage unit 15 according to the update method determined in the above step S17.
- step S36 described above the cache processing unit 24 updates the cache data in the cache storage unit 25 based on the update method information included in the data response message.
- the method of determining the cache update method by the data transmission processing unit 12 may be any method.
- the server 1 is provided with an input / output unit having a function of performing input / output with the outside. It is also possible for an operator or the like to control the method for determining the cache update method via the input / output unit. This makes it possible to change the cache update method to the optimum one according to the situation.
- the server 1 transmits either the original data or the difference data to the client 2 as a data response message.
- server 1 it is a good idea for server 1 to send other forms of data as data response messages.
- the communication unit 11 and the communication unit 21 transmit and receive the data request message and the data response message without any modification, but the communication unit 11 When the communication unit 21 and the communication unit 21 communicate with each other, it is possible to execute processing for reducing the amount of communication on the communication target.
- Examples of processing for reducing the amount of communication include data compression and decompression. Specifically, the amount of data can be reduced by compressing and transmitting data to be communicated by the communication unit on the transmission side and expanding the received data by the communication unit on the reception side. As described above, the communication reduction amount can be increased by executing the processing for reducing the communication amount in the communication unit 11 and the communication unit 21.
- the difference data is generated using two data force algorithms, ie, the original data and the cache data. It is also possible to use an algorithm that uses three or more data in total with the above cache data.
- cache data is not stored in the cache storage unit 15 and the cache storage unit 25 in the initial state.
- specific data may be stored as cache data. This is useful for differential generation It is possible to prepare various data in the cache storage unit 15 and the cache storage unit 25 in advance.
- whether or not differential transmission is performed is determined only on the server 1 side.
- whether or not differential transmission is performed can also be controlled from the client 2 side. Is possible. Specifically, for example, when the flag 2 indicating whether differential transmission is performed is added to the data request message by the client 2 and the differential transmission execution flag is “0”, the server 1 generates the differential data. Instead, the original data can always be stored in the data response message and sent to the client 2. This makes it possible to specify whether or not differential transmission is performed on the client 2 side.
- the server 1 and the client 2 may be provided with a mechanism for confirming in the data reception processing unit 22 that the cache data is the same as the cache data on the server 1
- the data transmission processing unit 12 when the data transmission processing unit 12 generates a data response message including the difference flag, the minimum difference data, and the cache identifier power in step S15, the hash information of the cache data corresponding to the cache identifier Is stored in the data response message, and when the data reception processing unit 22 uses the cache data in the cache storage unit 25 in step S33, the cache data is stored using the hash information. It is also possible to confirm that it is the same as on server 1.
- the sano 1 and the client 2 may be provided with a mechanism for confirming that the original data restored by the data reception processing unit 22 by the information restoration unit 26 is the same as that transmitted by the server 1. .
- the data transmission processing unit 12 when the data transmission processing unit 12 generates a data response message including the difference flag, the minimum difference data, and the cache identifier power in step S15, the hash information of the original data is used as the data response message.
- the data reception processing unit 22 restores the original data in step S33 above, It is also possible to confirm that the original data is the same as that sent by server 1 using the information.
- the difference information generation / comparison unit 16 generates the difference data with all the cache data in the above step S21. It is also possible for the generation / comparison unit 16 to generate only difference data from a part of the cache data according to a specific condition.
- Examples of conditions include "latest 10 cache data”. By using such conditions, it is possible to reduce the calculation processing cost in step S21 described above.
- the condition may be an arbitrary condition.
- a condition related to some attribute information of cache data may be used.
- attribute information include a size, a file name associated with the data, an identifier used to request the data, and the like.
- a data communication system capable of reducing the amount of communication can be realized. This effect is also effective when the client 2 requests the same data.
- FIG. 1 is a block diagram showing a configuration of a data communication system according to an embodiment of the present invention.
- FIG. 3 is a diagram showing an example of data in the cache storage unit of the client in FIG. 1.
- FIG. 4 is a sequence chart showing the operation of the data communication system according to the embodiment of the present invention.
- FIG. 5 is a flowchart showing data communication processing in the client of FIG. 1.
- FIG. 6 is a flowchart showing data communication processing in the server of FIG.
- FIG. 7 is a flowchart showing determination processing in the server of FIG. 1.
- FIG. 8 is a flowchart showing a data communication process in the client of FIG.
- FIG. 9 is a block diagram showing a configuration of a conventional data communication system.
- FIG. 10 is a block diagram showing another configuration of a conventional data communication system.
- FIG. 11 is a diagram showing an example of data stored in a cache storage unit of a conventional data communication system.
- FIG. 12 is a diagram showing another example of data stored in the cache storage unit of the conventional data communication system.
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US8270355B2 (en) | 2007-12-20 | 2012-09-18 | Nec Corporation | Radio communication control device, radio communication control system, radio communication control method, radio communication control program and recording medium |
JP2015528165A (ja) * | 2013-03-04 | 2015-09-24 | ヴイエムウェア インコーポレイテッドVMware,Inc. | ファイル間差分コンテンツ同期 |
US9355116B2 (en) | 2013-03-04 | 2016-05-31 | Vmware, Inc. | Cross-file differential content synchronization using cached patches |
US9418072B2 (en) | 2013-03-04 | 2016-08-16 | Vmware, Inc. | Cross-file differential content synchronization |
CN112416694A (zh) * | 2019-08-20 | 2021-02-26 | 中国电信股份有限公司 | 信息处理方法、系统、客户端和计算机可读存储介质 |
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JP5787833B2 (ja) * | 2012-06-25 | 2015-09-30 | 京セラドキュメントソリューションズ株式会社 | 画像処理装置、画像処理システム、情報処理装置、プログラム |
JP6330277B2 (ja) | 2013-09-10 | 2018-05-30 | 日本電気株式会社 | 送信装置、送信方法、送信プログラム、及び、中継システム |
JP6344520B2 (ja) * | 2015-02-19 | 2018-06-20 | 富士通株式会社 | 通信装置、情報処理方法、及び、情報処理プログラム |
JP6747303B2 (ja) | 2017-01-13 | 2020-08-26 | 富士通株式会社 | 通信装置、通信システム、通信方法、および、通信プログラム |
JP7087277B2 (ja) * | 2017-05-19 | 2022-06-21 | 富士通株式会社 | 情報処理装置、情報処理システム、情報処理プログラム及び情報処理方法 |
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US8270355B2 (en) | 2007-12-20 | 2012-09-18 | Nec Corporation | Radio communication control device, radio communication control system, radio communication control method, radio communication control program and recording medium |
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US9355116B2 (en) | 2013-03-04 | 2016-05-31 | Vmware, Inc. | Cross-file differential content synchronization using cached patches |
US9418072B2 (en) | 2013-03-04 | 2016-08-16 | Vmware, Inc. | Cross-file differential content synchronization |
US10447780B2 (en) | 2013-03-04 | 2019-10-15 | Vmware, Inc. | Cross-file differential content synchronization |
CN112416694A (zh) * | 2019-08-20 | 2021-02-26 | 中国电信股份有限公司 | 信息处理方法、系统、客户端和计算机可读存储介质 |
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