KR101515270B1 - System and method for transmitting file - Google Patents

Abstract

A file transfer system and method are disclosed. A file transfer system according to an embodiment of the present invention includes a file transmitter in which a file to be transferred is stored, at least one wireless access point connected to the file transmitter, and at least one wireless access point And a plurality of file receivers connected through a network and downloading and storing the transmission object file stored in the file transmitter, wherein the file transmitter classifies the plurality of file receivers as a forward receiver or an reverse receiver, And controls transmission / reception of the transmission object file between the receiver and the reverse receiver.

Description

[0001] SYSTEM AND METHOD FOR TRANSMITTING FILE [0002]

Embodiments of the present invention relate to techniques for effectively transferring a file over a network to multiple terminals.

Generally, a method of downloading the same file over a wired network includes a method of downloading a web page using HTTP, a download acceleration method using a channel expansion (FlashGet), or a peer-to-peer (BitTorrent) Peer-to-peer (P2P) scheme. Theoretically, the above methods can also be employed on a wireless network to transfer files. However, due to the nature of the wireless network and the particular nature of receiving data simultaneously on multiple terminals in the same subnet, simply applying the above method does not provide a visible benefit.

Therefore, in such a situation, you will typically use file downloads via HTTP, or FTP, the most classic way. However, when such a classical method is used, the network traffic is concentrated on the external network having the file. Therefore, the problem that the transmission speed is significantly slowed down when a plurality of terminals simultaneously download large files (for example, files of 50 MByte or more) .

Embodiments of the present invention are directed to providing means for rapidly downloading a file from a server to a plurality of terminals in a wireless environment.

A file transfer system according to an embodiment of the present invention includes a file transmitter in which a file to be transferred is stored, at least one wireless access point connected to the file transmitter, and at least one wireless access point And a plurality of file receivers connected through a network and downloading and storing the transmission object file stored in the file transmitter, wherein the file transmitter classifies the plurality of file receivers as a forward receiver or an reverse receiver, And controls transmission / reception of the transmission object file between the receiver and the reverse receiver.

According to another aspect of the present invention, there is provided a file transmission apparatus comprising: a storage unit for storing a file to be transmitted; a file receiver information management unit for storing file receiver information from a plurality of file receivers connected through one or more wireless access points; A file transmission controller for classifying a plurality of file receivers as a forward receiver or an reverse receiver and for transmitting the transmission object file to the forward receiver and the reverse receiver, and a receiver pair between the forward receiver and the reverse receiver, And a file receiver connection control unit for controlling transmission / reception of the transmission object file between the pair of receivers.

Meanwhile, a method for transmitting a transmission object file to a plurality of file receivers in a file transmission apparatus according to an embodiment of the present invention includes: classifying the plurality of file receivers as a forward receiver or an reverse receiver in a file transmission controller; Transmitting the file to be forwarded to the forward receiver and the reverse receiver in the file transfer control unit; forming a receiver pair between the forward receiver and the reverse receiver in a file receiver connection control unit; And controlling transmission / reception of the transmission object file between the pair of receivers formed.

Meanwhile, an apparatus according to an embodiment of the present invention is an apparatus including one or more processors, a memory, and one or more programs, wherein the one or more programs are stored in the memory and configured to be executed by the one or more processors, The program is for transmitting a file to be transmitted to a plurality of file receivers, the method comprising: classifying the plurality of file receivers as a forward receiver or an reverse receiver; transmitting the transmission object file to the forward receiver and the reverse receiver; Forming a receiver pair between the forward receiver and the reverse receiver, and controlling transmission and reception of the transmission object file between the pair of receivers formed.

According to embodiments of the present invention, when a plurality of terminals download the same file from the wireless network at the same time, maximizing the bandwidth utilization of the wireless network maximizes the file download speed of the terminals.

1 is a block diagram illustrating a configuration of a file transfer system 100 according to an embodiment of the present invention.
2 is a block diagram showing a detailed configuration of a file transmitter 102 according to an embodiment of the present invention.
3 is a block diagram showing a detailed configuration of a file receiver 106 according to an embodiment of the present invention.
4 is a diagram illustrating a structure of a connection information message 400 transmitted from a file transmitter 102 to a file receiver 106 according to an embodiment of the present invention.
5 is a flowchart illustrating a file transfer method 500 according to an embodiment of the present invention.
FIG. 6 is a flowchart illustrating a method 506 of directing a file receiver according to an embodiment of the present invention.
FIG. 7 is a flowchart illustrating a receiver pair forming process 512 of a file receiver according to an embodiment of the present invention.
8 is a graph for explaining effects according to the embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. However, this is merely an example and the present invention is not limited thereto.

In the following description, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intention or custom of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

The technical idea of the present invention is determined by the claims, and the following embodiments are merely a means for effectively explaining the technical idea of the present invention to a person having ordinary skill in the art to which the present invention belongs.

1 is a block diagram illustrating a configuration of a file transfer system 100 according to an embodiment of the present invention. As shown, a file transmission system 100 in accordance with an embodiment of the present invention includes a file transmitter 102, one or more wireless access points 104, and a plurality of file receivers 106.

The file transmitter 102 stores a transmission object file for transmission to the file receiver 106 and transmits the transmission object file to each of the file receivers 106. [ The file transmitter 102 also controls transmission / reception of the file to be transferred between the file receivers 106. That is, in the embodiment of the present invention, each file receiver 106 is configured to not only receive the transmission object file from the file transmitter 102 but also receive it from the other file receiver 106 in a peer-to-peer manner do. To this end, the file transmitter 102 is configured to classify each file receiver 106 as a forward receiver or an reverse receiver, and to control transmission / reception of the transmission object file between the forward receiver and the reverse receiver. In the illustrated embodiment, the file receivers shown as 106-1, 106-2, 106-5, and 106-6 are file receivers 106 designated as forward receivers, and 106-3, 106-4, 106-7, The file receiver shown at 106-8 is a file receiver 106 designated as a reverse receiver.

In the embodiment of the present invention, the transmission object file is composed of a plurality of fragments, and the file receiver 106 receives the transmission object file in units of fragments from the file transmitter 102 or another file receiver. At this time, upon reception of the transmission object file from the file transmitter 102, the forward receiver sequentially receives the transmission object file from the first piece among the plurality of pieces constituting the transmission object file. That is, when the transmission object file is composed of N pieces, the reception order of the transmission object files in the forward receiver is as follows (the numbers are the fragment numbers).

1, 2, 3, ..., N

On the contrary, the reverse receiver receives the file from the file transmitter 102 in the reverse direction from the last piece of the plurality of pieces. That is, in this case, the reception order of the transmission object file is as follows.

N, N-1, N-2, ..., 1

The wireless access point 104 is connected to the wireless access point 104 through a wireless network with a file receiver 106 and forms an internal network composed of a plurality of file receivers 106, So that files can be shared. The wireless access point 104 is connected to the file transmitter 102 through a wired network or the like to mediate transmission of the transmission object file stored in the file transmitter 102 to the file receiver 106. [ Although the illustrated embodiment depicts an embodiment with two wireless access points 104, this is exemplary and there is no limit to the number of wireless access points 104 in an embodiment of the present invention. Also in an embodiment of the present invention, each wireless access point 104 is configured to belong to the same internal network.

The file receiver 106 is connected to a wireless access point 104 of one or more wireless access points 104 through a wireless network and downloads and stores the transmission object file stored in the file transmitter 102. The file receiver 106 is divided into a forward receiver or a reverse receiver according to the direction specified by the file transmitter 102. The file receiver 106 designated as the reverse receiver sequentially downloads the file from the file transmitter 102 starting from the first fragment of the transmission object file and the file receiver 106 designated as the reverse receiver sequentially extracts the last fragment of the transmission object file And downloads the transmission object file in the reverse direction.

In the embodiment of the present invention, the number of file receivers 106 is not particularly limited, and the number of file receivers 106 connectable in one wireless access point 104 is also not limited. That is, the connection of the file receiver 106 is freely available to the extent that the wireless access point 104 is acceptable. Also, as will be described later, the file transmitter 102 tries to keep the number of forward and reverse receivers as close to each other as possible when designating the direction of the file receiver 106, but the number of the forward and reverse receivers must always be the same Note that the

On the other hand, the file receiver 106 downloads the file from the file transmitter 102 and also downloads the transmission object file from the file receiver 106 in a peer-to-peer manner from another specified file receiver. A file transmitter 102 connects each file receiver 106 connected via a wireless access point 104 to each other to form a receiver pair. Each file receiver 106 included in the receiver pair receives And receives the transmission object file. At this time, the file transmitter 102 configures the receiver pair so that the forward and reverse receivers form one receiver pair with each other. Accordingly, the forward receiver receives the transmission object file in the forward direction from the first piece of the transmission object file from the file transmitter 102, and transmits the reverse object from the reverse receiver in the reverse direction And receives the file to be transferred. On the contrary, the reverse receiver receives the transmission object file from the file transmitter 102 in the reverse direction from the last fragment of the transmission object file, and also receives the forward object from the forward receiver paired with the reverse receiver in the forward direction And receives the file to be transferred.

2 is a block diagram showing a detailed configuration of a file transmitter 102 according to an embodiment of the present invention. The file transmitter 102 according to an exemplary embodiment of the present invention includes a storage unit 200, a file receiver information management unit 202, a file transfer control unit 204, and a file receiver connection control unit 206.

The storage unit 200 stores the file to be transferred. For example, the storage unit 200 may be a volatile storage device such as a memory or a nonvolatile storage device such as a hard disk, a solid state drive (SSD), or the like.

The file receiver information management unit 202 stores file receiver information for each connected file receiver 106. [ At this time, the file receiver information includes identification information (ID, etc.) of each file receiver 106, connection address (including IP and port information of the internal network as an internal network address), a currently connected wireless access point 104, Forward offset / reverse offset of the transmission subject file being downloaded, current network status (speed and bandwidth, etc.), connected partner file receiver information, and the like. The file receiver information may be received from the file receiver according to the item, or may be generated by the file transmitter 102 itself.

The forward offset and the reverse offset of the file receiver information are information indicating how far the file receiver of the file receiver has downloaded the file fragments of the transmission object file. The forward offset is incremented every time a file fragment is received from the first fragment of the file starting at 0, and the reverse offset starts from the maximum value (the number of transmission destination files) and is received one by one in the reverse direction Decrease every time. For example, in the case of a forward receiver, the forward offset increases each time a file fragment is received in the forward direction from the file transmitter 102, and the reverse offset decreases each time a file fragment is received in reverse from the connected counterpart file receiver . Accordingly, the file reception is completed when the forward offset and the reverse offset meet.

The file transfer control unit 204 classifies the plurality of file receivers 106 as a forward receiver or an inverted receiver and transmits the transmission object file stored in the storage unit 200 to the forward receiver and the reverse receiver. The file transfer control unit 204 calculates the number of file receivers 106 connected to each wireless access point 104 by using the file receiver information and adds the number of file receivers 106 to the number of file receivers 106 for each wireless access point 104 And classifies the file receiver 106 as a forward receiver or a reverse receiver. An example of a specific forward receiver and reverse receiver classification method is described in detail in FIG.

The file receiver connection control unit 206 forms a receiver pair between the forward receiver and the reverse receiver and controls transmission / reception of a transmission object file between the pair of receivers formed. Specifically, the file receiver connection control unit 206 calculates the AP Link Capacity of the access point 104 of each forward receiver and the reverse receiver. The link capacity is a logical value obtained by a function relationship between a wireless bandwidth of each file receiver 106, a file transmission rate with the file transmitter 102, and a number of file receivers connected to the wireless access point 104 to which the link receiver 104 is connected. Is a relative value when the link capacity of the file receiver is 100 when only one file receiver is connected to one wireless access point 104. [ For example, when two file receivers 106 are connected to one wireless access point 104 under exactly the same conditions, the link capacity of each file receiver is 50. [

In a wireless connection, the bandwidth between the file receiver 106 and the wireless access point 104 is affected by location and signal strength between the wireless access point 104 and the file receiver 106, obstacles and radio waves that interfere with wireless communication, It changes in real time. The file transmitter 102 periodically receives the bandwidth information of each file receiver 106 connected to the wireless access point 104. In addition to the bandwidth information of the file receiver 106, a data transmission rate between the file transmitter and the file receiver 106 and the number of file receivers connected to the wireless access point 104 are periodically received. While periodically updating this information, the file transmitter 102 calculates the link capacity of each file receiver. The detailed calculation algorithm of the link capacity is well known in the technical field of the present invention, which is outside the scope of the present invention, and therefore, a detailed description thereof will be omitted here.

When the link capacity is calculated, the file receiver connection controller 206 aligns the forward and reverse receivers according to the calculated link capacity, and sequentially forms a receiver pair between the forward receiver and the reverse receiver according to the ordered order . At this time, if there is a file receiver 106 that can not form a receiver pair, the file receiver connection control unit 206 controls the corresponding file receiver to transmit the file receiver having the reverse direction among the forward receiver or the reverse receiver, 106, or to a file receiver 106 that has completed the download of the transmission object file. An example of a concrete receiver pair forming method will be described in detail in Fig.

When the receiver pair is configured through the above process, the file receiver connection control unit 206 transmits connection information of the counterpart file receiver 106 to each of the forward and reverse receivers constituting each pair of receivers, (106) accesses the counterpart file receiver (106) using the received connection information and receives the transmission object file. As described above, in this case, the forward receiver is configured to receive the transmission object file from the counterpart file receiver 106 in the reverse direction, and the reverse receiver is configured to receive the transmission object file from the counterpart file receiver 106 in the forward direction.

3 is a block diagram showing a detailed configuration of a file receiver 106 according to an embodiment of the present invention. As shown in the figure, the file receiver 106 according to an embodiment of the present invention includes a message transmission / reception unit 300, a file download unit 302, and a storage unit 304.

The message transmission / reception unit 300 transmits a message to be transmitted to the file transmitter 102 and processes a message received from the file transmitter 102. When the file receiver 106 connects to the file sender 102, the message sender / receiver 300 determines the identity of the file receiver 106, the connection address, the information of the connected access point 104, the offset of the file (forward offset and reverse Offset), network speed status, information of the connected partner file receiver, and the like to the file sender. The information may be transmitted to the file transmitter 102 at the time of connection of the file receiver 106, whenever there is a change in information, or according to a predetermined period. In addition, the message transmission / reception unit 300 receives a message designating a direction (forward or reverse) of the file receiver 106 from the file transmitter 102, or a connection information message for downloading the transmission object file. At this time, the connection information message may include the connection address of the file transmitter 102 or the counterpart file receiver 106 to which the file receiver 106 will connect to download the transmission object file. The detailed configuration of the connection information message will be described in detail with reference to FIG.

The file download unit 302 downloads the transmission object file according to the direction designation message and the connection information message received by the message transmission and reception unit 300. [ Specifically, the file downloading unit 302 accesses the file transmitter 102 or the counterpart file receiver 106 using the connection address of the file transmitter 102 or the counterpart file receiver 106 included in the connection information message And downloads the file. At this time, the reception order of the file fragments varies according to the direction of the file receiver 106, as described above.

The storage unit 304 is a space in which the transmission object file downloaded from the file download unit 302 is stored.

4 is a diagram illustrating a structure of a connection information message 400 transmitted from a file transmitter 102 to a file receiver 106 according to an embodiment of the present invention. As shown, the connection information message includes a connection command ID 402, a number of connection objects 404, and one or more connection object information 406. [

The connection command ID 402 is an ID for identifying that the present message is a connection information message, and a value previously determined between the file transmitter 102 and the file receiver 106 may be stored.

The number of connection targets 404 indicates the number of objects to which the file receiver to receive the message should connect. Initially this number indicates 2 because the file receiver 106 basically downloads the file fragments from the file transmitter 102 and also downloads the fragments of the file from different file receivers 106. However, since a file receiver 106 can be connected to one or more other file receivers as the file download proceeds, in this case, the number 404 of connection objects is increased.

The connection object information 406 is information for connection to the file transmitter 102 or other file receiver 106 to be connected for downloading the file fragments, such as the IP and port of the connection object, the forward / backward offset of the connection object, The connection information message 400 has the connection object information 406 corresponding to the number of connection objects 404. In the present embodiment, the connection information message 400 includes two connection object information The length of the connection information message 400 varies depending on the number of objects to be connected. The direction of the connection object of the information means the direction of the counterpart file receiver 106. FIG. If the connection information is the connection information of the file transmitter 102, since the file transmitter 102 has no direction, the corresponding column may include the direction information of the file receiver 106 receiving the message .

5 is a flowchart illustrating a file transfer method 500 according to an embodiment of the present invention. First, the file receiver 106 accesses the file transmitter 102 (502) and transmits its information (file receiver information) to the file transmitter 102 (504). At this time, the file receiver information may include an ID of the file receiver 104, access information, wireless access point information being connected, and forward and reverse offsets of the file.

The file sender 102 receives and stores the file receiver information and uses it to specify the direction of the connected file receiver 106 (506). The direction may be determined according to the number of connections of the file receivers 106 connected to each wireless access point 104, which will be described in detail with reference to FIG.

If the direction of the file receiver 106 is designated, the file transmitter 102 transmits the specified direction information to the file receiver 106 (508), and transmits each piece of the transmission object file according to the direction (510) .

Next, the file transmitter 102 forms a receiver pair with the connected file receiver 106 (512). As described above, the receiver pair may be formed between one forward receiver and the reverse receiver. When the receiver pair is formed, the file transmitter 102 transmits a connection information message 400 including the partner file receiver information to the file receiver 106 (514), and the file receiver 106 transmits the connection information message 400 including the partner file The file is downloaded from the receiver (516).

FIG. 6 is a flowchart illustrating a method 506 of directing a file receiver according to an embodiment of the present invention. However, the present method is merely an example, and the present invention is not limited to a specific direction specification method.

First, when a new file receiver 106 is connected (600), the file transmitter 102 sends a message to the wireless access point 104 to which the connected file receiver 106 is connected, It is determined whether a file receiver is connected (602). If the number of the file receivers connected to the wireless access point 104 is odd, the file transmitter 102 determines the direction of the file receiver most recently connected to the corresponding access point 104 (604 , And assigns the direction opposite to the above direction to the connected file receiver 106. In other words, if a forward link is allocated to the most recently connected file receiver, a reverse link is allocated to a newly connected file receiver 106 (608), and if a reverse link is allocated, a forward link is allocated (610). This is intended to balance the direction of the file receiver 106 assigned to each wireless access point 104.

If the number of the file receivers connected to the corresponding access point 104 is an even number, the file transmitter 102 compares the number of the forward receivers and the number of the reverse receivers of the entire network with each other (612) Specify the direction of the number. That is, if the number of forward receivers in the entire network is smaller than the number of reverse receivers, it is classified as a forward receiver (608). If the number of reverse receivers is smaller than the number of forward receivers (610) the requested file receiver (106) as a reverse receiver. This process is repeatedly performed each time a new file receiver 106 is connected.

FIG. 7 is a flowchart illustrating a receiver pair forming process 512 of a file receiver according to an embodiment of the present invention.

First, the file transmitter 102 calculates the link capacity (AP Link Capacity) of the access point 104 of each forward receiver and the reverse receiver (700). The link capacity related matters have been described above.

Next, the file transmitter 102 arranges (702) the forward and reverse receivers respectively in the order of the calculated link capacity, and sequentially forms a receiver pair between the forward receiver and the reverse receiver according to the ordered order (704). For example, the receiver with the first highest link capacity of the file forward receiver is connected to the reverse receiver with the highest link capacity, and the receiver with the second highest link capacity also has the second largest link class Is connected to the reverse receiver.

Meanwhile, in step 704, there may be a file receiver that can not form a receiver pair. For example, if the number of reverse receivers is greater than that of the forward receivers, the number of reverse receivers that exceed the number of receivers can not pair with the forward receivers. In this case, the file transmitter 102 connects the file receiver 106 to the file receiver 106 having the opposite direction out of the forward receiver or the reverse receiver forming the receiver pair, or transmits the file To the receiver 106 (708). When a file receiver determines a target file receiver to connect to, it must either 1) the destination file receiver is in a different direction from itself, or 2) the target file receiver has already downloaded the file. Accordingly, if there are remaining file receivers that can not be connected after step 704, the corresponding receivers are sequentially connected to receivers in the opposite direction of the file receivers to which the receivers are connected, or in other words, It is connected to a connectable receiver. In the wireless environment, since the file reception rate of the file receiver 106 changes with time, the step 512 can be repeatedly performed at a constant cycle.

When a particular file receiver first finishes downloading a file, the file receiver 106 notifies the file sender 102 of the completion of the file download, and the file receiver 106 is no longer meaningful in the directionality of forward, backward, Any file receiver can be the target of a connection.

If the communication between the file receiver and the wireless access point 104 is interrupted due to a failure of the wireless access point 104 or the like, it is inevitable that some of the file receivers 106 are in a normal operation with other wireless access points 104 ) May need to be connected. In this case, however, the file transmitter 102 periodically receives new information from the file receiver 102, such as the bandwidth between the terminal and the wireless access point 104, the data transmission rate, and the number of file receivers connected to the wireless access point 104 The file receiver 106 newly connected after the communication is disconnected can participate in normal file reception.

8 is a graph for explaining effects according to the embodiment of the present invention. The dotted line indicates the case where the size of the file is 10 MB and the solid line indicates the case of 100 MB. The dotted line compares the file transfer speeds according to the bit torrent method, the web method, and the file transfer method of the present invention, respectively. According to this graph, when the file transfer method of the present invention is used, the file transfer rate is increased by about 50% or more as compared with the bit torrent method and the web method. Particularly, as the file size increases, the effect according to the embodiment of the present invention is further improved.

On the other hand, an embodiment of the present invention may include a computer-readable recording medium including a program for performing the methods described herein on a computer. The computer-readable recording medium may include a program command, a local data file, a local data structure, or the like, alone or in combination. The media may be those specially designed and constructed for the present invention or may be known and available to those of ordinary skill in the computer software arts. Examples of computer readable media include magnetic media such as hard disks, floppy disks and magnetic tape, optical recording media such as CD-ROMs and DVDs, magneto-optical media such as floppy disks, and magnetic media such as ROMs, And hardware devices specifically configured to store and execute program instructions. Examples of program instructions may include machine language code such as those generated by a compiler, as well as high-level language code that may be executed by a computer using an interpreter or the like.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be construed as limiting the scope of the present invention. I will understand.

Therefore, the scope of the present invention should not be limited to the above-described embodiments, but should be determined by equivalents to the appended claims, as well as the appended claims.

100: File Transfer System
102: File transmitter
104: Wireless access point
106: File receiver
200:
202: File receiver information management unit
204: File transfer control unit
206: File receiver connection control section
300: a message transmission /
302: File download section
304:
400: Connection information message
402: Connection command ID
404: Number of connections
406: Connection target information

Claims (27)

A file transmitter for storing a file to be transferred;
One or more wireless access points connected to the file transmitter; And
And a plurality of file receivers connected to any one of the one or more wireless access points through a wireless network and downloading and storing the transmission object file stored in the file transmitter,
Wherein the file transmitter classifies the plurality of file receivers as a forward receiver or an reverse receiver and transmits the forwarding file in the forward and reverse directions to the forward receiver and the reverse receiver respectively, And controls transmission and reception of the transmission target file between the pair of receivers so that the forward receiver and the reverse receiver constituting the receiver pair receive the transmission object files from each other in the reverse and forward directions, respectively.
The method according to claim 1,
Wherein the forward receiver is a file receiver that sequentially receives the transmission object file from the first piece of the plurality of pieces constituting the transmission object file from the file transmitter,
Wherein the reverse receiver is a file receiver that receives the transmission object file in the reverse direction from the last piece of the plurality of pieces from the file transmitter.
The method according to claim 1,
Wherein the file transmitter stores file receiver information including an ID of each file receiver, a connection address, a wireless access point being connected, a forward offset and a backward offset of the transmission object file being downloaded from each of the plurality of file receivers, Transmission system.
The method according to claim 1,
If the number of file receivers connected to the wireless access point to which the file receiver requesting connection is currently connected is an odd number,
Classifying the file receiver that requested the connection as an uplink receiver when the most recently connected file receiver to the access point is classified as a forward receiver,
And classifies the file receiver requesting the connection as a forward receiver if the most recently connected file receiver to the access point is classified as a reverse receiver.
The method according to claim 1,
If the number of file receivers connected to the wireless access point to which the file receiver requesting connection is currently connected is an even number,
Comparing the number of all forward receivers and all reverse receivers connected to the file transmitter and classifying the file receivers requesting the connection as a forward receiver if the number of forward receivers is smaller than the number of reverse receivers,
And classifies the file receivers requesting the connection as reverse receivers if the number of reverse receivers is less than the number of forward receivers.
The method according to claim 1,
The file transmitter calculates AP Link Capacity of each forward receiver and the reverse receiver, aligns the forward receiver and the reverse receiver according to the calculated link capacity, And sequentially form a receiver pair between the forward receiver and the reverse receiver.
The method of claim 6,
Wherein the link capacity is calculated according to a wireless bandwidth between the forward receiver or the reverse receiver and the wireless access point, a transmission rate between the wireless access point and the file transmitter, and a number of file receivers connected to each wireless access point. Transmission system.
The method of claim 6,
If the file transmitter has a file receiver that can not form a receiver pair,
The file receiver connects the file receiver to a file receiver having an opposite direction of a forward receiver or a reverse receiver forming the pre-receiver pair, or connects to a file receiver to which the download of the transmission object file has been completed.
The method of claim 6,
Wherein the file transmitter transmits connection information of a partner file receiver to each of the forward and reverse receivers constituting the receiver pair.
The method of claim 9,
Wherein the forward receiver and the reverse receiver constituting the receiver pair access the counterpart file receiver using the received connection information and receive the transmission object file.
A storage unit for storing a file to be transferred;
A file receiver information manager for storing file receiver information from a plurality of file receivers connected through one or more wireless access points;
A file transfer controller for classifying the plurality of file receivers as forward or reverse receivers and for forwarding and forwarding the files to be forwarded to the forward and reverse receivers, respectively; And
Receiving and transmitting the transmission object file between the pair of receivers so that the forward receiver and the reverse receiver constituting the receiver pair receive the transmission object files from each other in the reverse and forward directions, respectively, forming a receiver pair between the forward receiver and the reverse receiver, And a file receiver connection control section for controlling the file receiver.
The method of claim 11,
The file receiver information management unit stores file receiver information including an ID of each file receiver, a connection address, a connected wireless access point, a forward offset and a backward offset of the transmission object file being downloaded from each of the plurality of file receivers , A file transfer device.
The method of claim 12,
The file transmission control unit calculates the number of file receivers connected to each wireless access point using the file receiver information and classifies the file receiver as a forward receiver or a reverse receiver according to the calculated number of file receivers for each wireless access point File transfer device.
14. The method of claim 13,
If the number of file receivers connected to the wireless access point to which the file receiver requesting connection is currently connected is an odd number,
Classifying the file receiver that requested the connection as an uplink receiver when the most recently connected file receiver to the access point is classified as a forward receiver,
And classifies the file receiver requesting the connection as a forward receiver if the most recently connected file receiver to the access point is classified as a reverse receiver.
14. The method of claim 13,
When the number of file receivers connected to the wireless access point to which the file receiver requesting connection is currently connected is an even number,
Comparing the number of all forward receivers and all reverse receivers connected to the file transmitter and classifying the file receivers requesting the connection as a forward receiver if the number of forward receivers is smaller than the number of reverse receivers,
And classifies the file receiver requesting the connection as a reverse receiver if the number of reverse receivers is smaller than the number of forward receivers.
The method of claim 11,
The file receiver connection control unit calculates AP link capacity of each forward receiver and the reverse receiver, aligns the forward receiver and the reverse receiver according to the calculated link capacity, And forms a receiver pair between the forward receiver and the reverse receiver in sequence according to the number of receivers.
18. The method of claim 16,
Wherein the link capacity is calculated according to a wireless bandwidth between the forward receiver or the reverse receiver and the wireless access point, a transmission rate between the wireless access point and the file transmitter, and a number of file receivers connected to each wireless access point. Transmission device.
18. The method of claim 16,
The file receiver connection control unit, when there is a file receiver that can not form a receiver pair,
Wherein the file receiver connects the file receiver to a file receiver having an opposite direction of a forward receiver or a reverse receiver forming the pre-receiver pair, or connects to a file receiver to which the download of the transmission object file is completed.
The method of claim 11,
Wherein the file receiver connection control unit transmits connection information of a counterpart file receiver to each of the forward and reverse receivers constituting the pair of receivers.
A method for transmitting a transmission object file to a plurality of file receivers connected through one or more wireless access points in a file transmission apparatus,
Classifying the plurality of file receivers as a forward receiver or a reverse receiver in a file transfer control unit;
Transmitting, in the file transfer control unit, the transmission object file in the forward and reverse directions to the forward receiver and the reverse receiver, respectively;
In a file receiver connection control section, forming a receiver pair between the forward receiver and the reverse receiver; And
And controlling, in the file receiver connection control unit, transmission and reception of the transmission object file between the pair of receivers so that the forward receiver and the reverse receiver constituting the receiver pair receive the transmission object files from each other in the reverse and forward directions, Transmission method.
The method of claim 20,
Wherein the classifying step calculates the number of file receivers connected to each wireless access point and classifies the file receiver as a forward receiver or a reverse receiver according to the calculated number of file receivers per wireless access point.
23. The method of claim 21,
If the number of file receivers connected to the wireless access point to which the file receiver requesting the connection is currently connected is an odd number,
Classifying the file receiver that requested the connection as an uplink receiver when the most recently connected file receiver to the access point is classified as a forward receiver,
And classifying the file receiver requesting the connection as a forward receiver if the most recently connected file receiver to the access point is classified as a reverse receiver.
23. The method of claim 21,
If the number of file receivers connected to the wireless access point to which the file receiver requesting the connection is currently connected is an even number,
Comparing the number of all forward receivers and all reverse receivers connected to the file transmitter and classifying the file receivers requesting the connection as a forward receiver if the number of forward receivers is smaller than the number of reverse receivers,
And classifies the file receiver requesting the connection as an uplink receiver if the number of reverse link receivers is smaller than the number of forward link receivers.
The method of claim 20,
Wherein forming the receiver pair comprises: calculating AP Link Capacity of each forward receiver and the reverse receiver, aligning the forward receiver and the reverse receiver according to the calculated link capacity, And sequentially forms a receiver pair between the forward receiver and the reverse receiver according to a predetermined order.
27. The method of claim 24,
Wherein the link capacity is calculated according to a wireless bandwidth between the forward receiver or the reverse receiver and the wireless access point, a transmission rate between the wireless access point and the file transmitter, and a number of file receivers connected to each wireless access point. Transmission method.
The method of claim 20,
Wherein forming the receiver pair comprises:
If there is a file receiver that can not form a receiver pair,
Further comprising the step of connecting the file receiver to a file receiver having an opposite direction of the forward receiver or the reverse receiver forming the preamble receiver pair or connecting to the file receiver whose download of the transmission object file has been completed.
One or more processors;
Memory; And
An apparatus comprising one or more programs,
Wherein the one or more programs are stored in the memory and are configured to be executed by the one or more processors,
The program
Classifying the plurality of file receivers as a forward receiver or a reverse receiver to transmit a transmission object file to a plurality of file receivers;
Transmitting the forwarding file in forward and reverse directions to the forward receiver and the reverse receiver, respectively;
Forming a receiver pair between the forward receiver and the reverse receiver; And
And controlling transmission and reception of the transmission object file between the pair of receivers so that the forward receiver and the reverse receiver constituting the receiver pair receive the transmission object files in reverse and forward directions from each other, respectively.

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