CN108234327A - Data transmission system, data receiver method and data transmission method - Google Patents
Data transmission system, data receiver method and data transmission method Download PDFInfo
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- CN108234327A CN108234327A CN201611144822.2A CN201611144822A CN108234327A CN 108234327 A CN108234327 A CN 108234327A CN 201611144822 A CN201611144822 A CN 201611144822A CN 108234327 A CN108234327 A CN 108234327A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/16—Multipoint routing
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/16—Arrangements for providing special services to substations
- H04L12/18—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast
- H04L12/185—Arrangements for providing special services to substations for broadcast or conference, e.g. multicast with management of multicast group membership
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- Computer Networks & Wireless Communication (AREA)
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- Data Exchanges In Wide-Area Networks (AREA)
Abstract
The present invention discloses a kind of data transmission system using two rank memories processing packet data, data receiver method, and data transferring method, it in client by setting buffering area and two rank memory of store media, when client receives the multicast package that server is transmitted, first the packet data in multicast package is temporarily stored into buffering area, when storing complete data block in buffering area, by data block by being moved in store media in buffering area, and data block in store media it is discontinuous when, notice server resends the technological means of the multicast package of loss, it can accelerate the data receiver and processing speed of client, and reach the technical effect that data transmission is completed with short period less bandwidth.
Description
Technical field
The present invention relates to a kind of data transmission system and data receiver and data transferring method, particularly relate to a kind of use two
Rank memory handles data transmission system, data receiver method and the data transmission method of packet data.
Background technology
The advantages of multicast (multicast, also known as multicast) technology is that server can be sent out to multiple client simultaneously
Data are sent, for the mode of unicast used in conventional TCP (unicast), multicasting technology occupies less frequency
It is wide.But the shortcomings that multicasting technology is to might have packet loss in data transfer procedure, is particularly susceptible the data ratio in transmission
Occur when larger or when client data receives or processing speed is bad.
In order to solve the problems, such as that package may be lost in data transmission procedure using multicasting technology, client is being judged to seal
It, can be to the package (mend and wrap) that server request repeat is lost when packet is lost.However, it once needs to seal to server request repeat
Packet also means that the time that data are completed to transmit will extend.Once because client data receive or processing speed it is bad and
Package is caused largely to be lost, this will cause data transfer time significantly to increase.
In summary, it is known that always exist multicasting technology for a long time in the prior art in transmission process probably due to visitor
Family end data receives or processing speed bad the problem of package is caused largely to lose and extend data transmission period, it is therefore necessary to
It is proposed improved technological means, come solve the problems, such as this one.
Invention content
In view of the prior art, there are may be because that client data receives or processing speed is bad in transmission process to cause
The problem of package is largely lost and extends data transmission period, the present invention disclose a kind of using two rank memories processing package number then
According to data transmission system, data receiver method and data transmission method, wherein：
Disclosed herein two rank memory of use processing packet data data transmission system, include at least：Service
Device and client.Wherein, server further includes：Service processing module, target data is divided into multiple data blocks simultaneously
Divide each data block for packet data；Service transmission module, to be sealed in order using multicast with certain frequency or speed
Packet transmission data block, wherein, multicast package includes packet data and to receive the benefit packet request that each client is transmitted,
Merge the benefit packet request repeated, and corresponding multicast package is sent according to packet request is mended.Client further includes：Buffering area；Visitor
Family store media；Client transmission module, to ask to add in multicast group and memory to be configured in the buffer to server
Space receives multicast package, and the packet data in multicast package is written the corresponding position in memory headroom；Client handles mould
Block, during judging that the packet data stored by memory headroom has formed complete data block, by data block by buffering area
It is moved in client's store media and to judge number according to the identification data of data block stored in client's store media
According to block it is discontinuous when, server is notified and according to data field stored in client's store media by client transmission module
The identification data of block judge that leading to the client transmission module when client's store media has stored complete object data exits multicast group.
Disclosed herein data transmission method, applied to server, server provides client connection, step
It includes at least：Target data is divided into multiple data blocks, and divides each data block for packet data；Receive client institute
The group of transmission adds in request, and allows or refuse client to add according to the quantity of client and the transmission times of target data
Multicast group；The following steps are repeated until target data has repeated to send certain number or client all exits multicast group：With
Certain frequency or speed press sequential selection data block of the data block in target data；It is sent using multicast package selected
The data block selected, multicast package include packet data；Merge the benefit packet request for the repetition that client is transmitted；It please according to packet is mended
It asks and sends corresponding multicast package.
Disclosed herein two rank memory of use processing packet data data receiver method, applied to client,
Client includes buffering area and client's store media, and is connect with server, and step includes at least：It asks to add in server
Multicast group；Memory headroom is configured in the buffer；Receive the multicast package that is transmitted of server, and by the envelope in multicast package
Corresponding position in bag data write-in memory headroom；Judge that the packet data stored by memory headroom has formed complete data field
During block, by buffering area mobile data block to client's store media；According to data block stored in client's store media
Identification data when judging that data block is discontinuous, transmission and discontinuous data block be corresponding to mend packet request to servicing
Device；Identification data according to data block stored in client's store media judge that client's store media has stored complete object
Multicast group is exited during data.
Disclosed herein System and method for as above, the difference between the prior art be the present invention by client
End setting buffering area and two rank memory of store media when client receives the multicast package that server is transmitted, first will
Packet data in multicast package is temporarily stored into buffering area, when storing complete data block in buffering area, by data block
By being moved in store media in buffering area, and when data block in store media is discontinuous, notice server resends something lost
The multicast package of mistake is used and solves the problems of prior art, and can reach and complete number with short period less bandwidth
According to the technical effect of transmission.
Description of the drawings
The element schematic of server that Fig. 1 is carried for the present invention.
The element schematic of client that Fig. 2 is carried for the present invention.
The flow chart of data transmission method that Fig. 3 is carried for the present invention.
Fig. 4 handles the flow chart of the data receiver method of packet data for the two rank memory of use that the present invention is carried.
【Symbol description】
100 servers
110 service store medias
120 service processing modules
130 service transmission modules
200 clients
210 buffering areas
220 client transmission modules
230 client's processing modules
240 client's store medias
Specific embodiment
Carry out the feature and embodiment that the present invention will be described in detail below in conjunction with schema and embodiment, content is enough to make any
Those skilled in the art can fully understand that the present invention solves the technological means that technical problem is applied and implements according to this easily,
Thereby realize the attainable effect of the present invention.
The present invention is applied in the network environment that server uses a large amount of clients multicast (multicast) technology,
In, the present invention is additionally provided with buffering area in the client, uses and client is allowed to be sealed in reception by the multicast that server is sent out
The multicast package received can be temporarily stored into buffering area by Bao Shi, and then the partial data in store buffer area is written again
In store media.
The client that the element schematic and " Fig. 2 " present invention for the server that following elder generation is carried with " Fig. 1 " present invention are carried
The element schematic at end come illustrate the present invention system operation.As shown in " Fig. 1 " and " Fig. 2 ", system of the invention contains service
Device 100 and client 200.
Group's addition request that reception client 200 of server 100 being responsible for is transmitted, and current according to server 100
Whether condition selecting allows client 200 to add in multicast group, in addition, server 100 also is responsible for number of targets through multicasting technology
Multicast package is sent to the client 200 in same multicast group according to this.Wherein, server 100 further includes service store media
110th, service processing module 120 and service transmission module 130.
It services store media 110 and is responsible for storage target data.Servicing the target data stored by store media 110 is usually
The larger file of file size, but the present invention is not limited thereto.
Service processing module 120 be responsible for scheduled block length (such as：2MB, but the present invention is not limited thereto) will
Target data stored by service store media 110 is divided into multiple data blocks, and with scheduled data length (such as：
32KB, but the present invention is also not limited) each data block is divided into one or more packet datas.Wherein, it services
Each data block that the segmentation of processing module 120 generates is according to the position for corresponding to target data and with corresponding sequence.
In the embodiment of part, service transmission module 130 can first compress the data block that segmentation generates, and will compress
Data block afterwards is divided into packet data.
Service transmission module 130 is responsible for receiving group's addition request that client 200 is transmitted, and according to requested addition
Multicast group in client terminal quantity and/or target data transmission times selection allow or refusal 200 addition group of client
Broadcast group.For example, when the client terminal quantity in multicast group reaches scheduled upper limit value, for another example, when the transmission of target data
When number reaches scheduled number, service transmission module 130 can refuse client 200 and add in requested multicast group.
Service transmission module 130 also is responsible for selecting in order each caused by 120 segmentation object data of service processing module
A data block, and be sent to after the packet data of the currently selected data block selected is encapsulated as different multicast packages one by one
Client 200.For example, service transmission module 130 first will can divide the packet data generated sequentially by first data block
It is encapsulated as multicast package and is sent to client 200, then by the packet data generated by second data block segmentation sequentially
It is encapsulated as multicast package and is sent to client 200, and so on.
It is concurrent for multicast package that service transmission module 130 can encapsulate a packet data according to certain frequency or speed
Send the multicast package being generated that can also multiple packet datas be once encapsulated as different multicasts respectively to client 200 and sealed
Bao Hou sends a multicast package according to certain frequency or speed, and the present invention is not particularly limited.Wherein, it is above-mentioned
Certain frequency or speed can be certain time interval (such as every ten milliseconds) or regular time (such as it is per second in
The 0th millisecond with the 50th millisecond etc.), but the present invention is not limited thereto, and above-mentioned certain frequency or speed can be
The predetermined value of system or the setting value set by 100 manager of server.
In general, service transmission module 130 can receive first 200 institute of client after the startup of server 100
After the group of transmission adds in request and the client 200 is allowed to add in multicast group, that is, the client 200 and server
After 100 establish connection, all clients 200 of the multicast package to addition multicast group are sent according to scheduled frequency or speed,
Whether subsequent any client 200 is allowed to or refuses addition multicast group and all do not interfere with service transmission module 130 to group
Broadcast frequency or speed that group sends multicast package.But the present invention is not limited thereto.In the embodiment of part, service transmission
Module 130 can also stop sending multicast package when not having any client 200 in judging multicast group.
Service transmission module 130 is also responsible for receiving the benefit packet request that each client 200 is transmitted, and merge the benefit of repetition
Packet request (namely when different clients request sends same packet data again, will ask the multiple of same packet data
Mend packet request and be considered as one and mend packet request) and according to received benefit packet request corresponding multicast package is sent to hair
Go out to mend the client 200 of packet request.
In the embodiment of part, service transmission module 130 can be when receiving benefit packet request, according to received
The requested multicast package discarding transmission sequence of packet request is mended to ask in preceding a certain number of packets of mending.Namely when currently transmitted
Packet data and requested packet data between possessed packet data number be more than predetermined value when, service transmission module
130 can abandon the benefit packet request of requested packet data.
Client 200 is responsible for asking to add in multicast group, and be responsible for receiving by servicing by multicasting technology to server 100
Multicast package transmitted by device 100, uses and obtains target data by server 100.Wherein, client 200 includes buffering area
210th, client transmission module 220, client's processing module 230 and client's store media 240.
Buffering area 210 is responsible for providing client transmission module 220 temporary received packet data.Buffering area 210 can be with
It is not particularly limited using random access memory, flash memory or other store medias, the present invention.Especially it is worth mentioning
, buffering area 210 is different from the buffering area (buffer) on well-known network card, the memory being usually additionally configured.
Client transmission module 220 is responsible for transmission group and joins request to server 100, uses and adds to the request of server 100
Enter multicast group.
Client transmission module 220 also is responsible for that memory headroom is configured in buffering area 210, and in the multicast package received
The corresponding position in memory headroom be configured is written in packet data.In general, the group received by client transmission module 220
Broadcast recorded in package the sequence for being enough to allow client transmission module 220 to pick out received multicast package data (such as
Number in serial number or multicast package content in multicast package gauge outfit etc., the present invention is not particularly limited) so that client
According to the sequence of received multicast package memory headroom can be written in packet data in multicast package by transmission module 220
In corresponding position.
Client transmission module 220 can delete storage time at most when judging that memory headroom be configured has been expired
Packet data uses the packet data that storage newly receives.
In the embodiment of part, client transmission module 220 can abandon institute in the predetermined time after adding in multicast group
The multicast package received uses the correctness that avoids receiving incomplete multicast package and influence received data.
Client's processing module 230 is responsible for judging package stored in the memory headroom that client transmission module 220 is configured
When data can form complete one or more data blocks, complete data block is moved to by buffering area 210
In client's store media 240, that is, complete data block is copied in client's store media 240 and is stored, and by delaying
Rush the packet data deleted and copied in client's store media 240 in area 210.
Client's processing module 230 also is responsible for the identification data according to data block stored in client's store media 240
When judging that the data block being stored in client's store media 240 is discontinuous, server is notified by client transmission module 220
100, and the identification data of stored data block according to client's store media 240 have judged client's store media 240
When storing complete object data, notice client transmission module 220 exits multicast group.In general, above-mentioned data block
Identification data can be formed by any number of word or digital arbitrary arrangement, and the present invention is not particularly limited, but different numbers
It is not repeated according to the identification data of block.
Then with one embodiment come explain the present invention operation system and method, and please refer to " Fig. 3 " present invention carried
Data transmission method flow chart and " Fig. 4 " present invention carried two rank memory of use processing packet data data connect
The flow chart of receiving method.Present embodiment assumes that the present invention is applied on production line, but the present invention is not limited thereto.
After the startup of server 100, the service processing module 120 of server 100 can be stored by the service of server 100
Target data is read in media 110, then target data is divided into multiple data blocks, and each data block is divided into envelope
Bag data (step 305).
Later, when client 200 is when production line moves, the client transmission module 220 of client 200 can be with server
100 connections, and transmit group and join request to server 100, it uses and asks to add in multicast group (step to server 100
402).In this example, it is assumed that client transmission module 220 can be connect, and pass through nothing by wireless network with server 100
Gauze network technology transfer group adds in request to server 100.
After the group's addition request for receiving that client 200 is transmitted in service transmission module 130, service transmission module
130 can be current according to the client terminal quantity and/or target data for currently having added in same multicast group transmission times selection
Allow or refusal client 200 adds in requested multicast group (step 320).In this example, it is assumed that 200 institute of client
Ask the client terminal quantity and not up to upper limit value 200, and the transmission times that target data is current in the multicast group added in
Pre-determined number has not yet been reached 5 times, in this way, service transmission module 130 can select that client 200 is allowed to add in requested multicast
Group.And if client 200 multicast group added in is asked to have 200 other clients add in or target data is current
Transmission times be the 5th (last time) when, service transmission module 130 can select refusal client 200 add in ask
Multicast group, in this way, client 200 needs that other clients 200 is waited for leave requested multicast group or wait to be serviced
Transmission module 130 restarts after sending target data, and service transmission module 130 can just select that client 200 is allowed to add in
Multicast group.
When there is any client 200 to be allowed to add in multicast group, service transmission module 130 can be first with certain frequency
Or sequence of the data block in file destination that speed is generated by segmentation, sequentially select data block (step 330), then will be by
Data field each packet data in the block of selection is sequentially encapsulated as multicast package, and sends the multicast package of encapsulation generation to visitor
200 (step 340) of family end.In this example, it is assumed that service transmission module 130 segmentation generate data block after, Ke Yixian
Data block caused by compression, then compressed data block is divided into packet data, and can be at every predetermined time
Interval sends multicast package to all clients 200 in multicast group.
After client 200 adds in multicast group, the client transmission module 220 of client 200 can be in client 200
Memory headroom (step 406) is configured in buffering area 210.In this example, it is assumed that the memory that client transmission module 220 is configured
Space is 75% of the remaining space in buffering area 210.
Later, it when client transmission module 220 receives the multicast package that service transmission module 130 is transmitted, can incite somebody to action
Corresponding position (the step 410) in packet data write-in memory headroom in received multicast package.In the present embodiment,
In order to which client 200 is allowed to ensure the correctness of received data, after client 200 adds in multicast group, client transmission
Module 220 can abandon all multicast packages received in the predetermined time.In addition, when client transmission module 220 receives
During the multicast package that service transmission module 130 is transmitted, if memory headroom has been expired, client transmission module 220 can be deleted first
The packet data of storage time at most, then received packet data is written.
In addition, equally after client 200 adds in multicast group, client's processing module 230 of client 200 can also be sentenced
Whether the disconnected packet data being written in buffering area 210 by client transmission module 220 has formed complete data block (step
420).If so, client's processing module 230 can will form the packet data of partial data block by buffering area 210 together
It is moved to (step 430) in client's store media 240 of client 200；If it is not, then client's processing module 230 can continue
Treat that the packet data that client's transmission module 220 is written in buffering area 210 forms complete data block.
The packet data for forming partial data block is moved to client by buffering area 210 in client's processing module 230
After 200 client's store media 240, client's processing module 230 can further judge to be stored in client's store media 240
Whether continuous (the step 440) of data block.If the data block in client's store media 240 is discontinuous, client transmission module
220, which can transmit packet of mending corresponding with discontinuous data block, asks to 100 (step 450) of server, and continue to take
The multicast package and (step 410) in memory headroom is written into the packet data in multicast package that business device 100 is transmitted.Example
Such as, when data block stored in client's store media 240 is first and third data block, without the second data block
When, client's processing module 230 may determine that data block stored in client's store media 240 is discontinuous, and notifies visitor
Family transmission module 220 checks the packet data the second data block in buffering area 210 is written, and will still unreceived second
The identification data of the packet data of data block are encapsulated as corresponding mend and wrap request, and packet request is being mended caused by transmission to clothes
Business device 100.
When service transmission module 130 receives the benefit packet request that client 200 is transmitted, service transmission module 130 can
First to record the identification data of the packet data of requested repeating transmission, and a data block is completely being sent to client
After 200, merge the identical benefit packet request (step 350) that different clients 200 are transmitted, and according to the benefit packet request after merging
Sending corresponding multicast package gives client 200 (step 370).In this example, it is assumed that it is asked there are two client 200
The packet data that identification data are 208 is retransmitted, there are one 200 request repeats of client to identify the packet data that data are 413, then
The benefit packet request that service transmission module 130 can retransmit two packet data for identifying that data are 208 merges into one, such as
This, service transmission module 130 only one encapsulation of transmission will can identify multicast package and one of the data for 208 packet data
The multicast package of packet data that a encapsulation identification data are 413 is to client 200.
And if client's processing module 230 judges that the data block being stored in client's store media 240 is continuous, customers' place
Reason module 230 can judge all data blocks whether have been stored in client's store media 240 again, that is, judge client
Whether complete target data (step 460) has been stored in store media 240, if it is not, then continuing to be connect by client transmission module 220
The multicast package and (step in memory headroom is written into the packet data in multicast package that receipts server 100 is transmitted
410)；If so, client's processing module 230 can determine that client 200 is allowed to exit multicast group so that client 200 can be with
It continues to move in the production line, and client transmission module 220 can transmit group and exit information to server 100 so that client
Added in multicast group (step 470) is exited at end 200.
In addition, corresponding multicast package is sent to visitor according to received benefit packet request in service transmission module 130
After 200 (step 370) of family end, service transmission module 130 may determine that whether target data has sent and reach certain number or visitor
Whether family end 200 all has dropped out added in multicast group (step 380).If so, server 100 can terminate the present invention；If
It is no, that is, target data not yet sends certain number (such as 5 times) or still has client 200 in multicast group, then services
Sequence of the data block that transmission module 130 can continue to generate by segmentation with certain frequency or speed in file destination,
Data block (step 330) is sequentially selected, then selected data field each packet data in the block is sequentially encapsulated as multicast
Package, and send the multicast package that encapsulation generates and give client 200 (step 340).
In summary, it is known that the difference between the present invention and the prior art is with client setting buffering area and storage
Two rank memory of media, when client receives the multicast package that server is transmitted, first by the package number in multicast package
According to being temporarily stored into buffering area, when storing complete data block in buffering area, by data block by being moved to storage in buffering area
It deposits in media, and when the data block in store media is discontinuous, notice server resends the technology of the multicast package of loss
Means can solve in transmission process present in the prior art probably due to client data receives by this technological means
Or processing speed bad the problem of package is caused largely to lose and extend data transmission period, and then reach with the short period it is less
Bandwidth completes the technical effect of data transmission.
In the above embodiments, when service transmission module 130 receives the benefit packet request that client 200 is transmitted, clothes
Transmission module 130 of being engaged in can also ask requested multicast package to abandon transmission sequence preceding certain according to received benefit packet
The benefit packet request of quantity.In this example, it is assumed that the identification data of currently transmitted packet data are 315, it is requested
The identification data of packet data are 228, since the sequence difference of requested packet data and currently transmitted packet data is
87, when this sequence difference is more than predetermined value 50, the benefit packet that service transmission module 130 can abandon requested packet data please
It asks, and records the identification data of requested packet data not being dropped, that is, select not resend transmission sequence preceding
A certain number of packet datas.In other words, thus, when 200 request repeat transmission of client sequence is in preceding certain amount
Packet data when, client 200 will be unable to receive the packet data of request repeat at once, but need wait for service transmission
Module 130 again by the first data block, the second data block ... sequence retransmit each packet data to client
When 200, the packet data of request repeat can be just received.
Furthermore the data receiver method and data transferring method of two rank memory of use processing packet data of the invention,
It can be achieved in the combination of hardware, software or hardware and software, also can in a centralised manner realize in computer systems or with not
The dispersing mode that the computer system of several interconnection is interspersed among with element is realized.
Although disclosed herein embodiment as above, only the content be not to directly limit the present invention it is special
Sharp protection domain.Any the technical staff in the technical field of the invention, do not depart from disclosed herein spirit and model
Under the premise of enclosing, retouched to making a little change in the formal and details of the implementation of the present invention, belong to the patent of the present invention
Protection domain.The scope of patent protection of the present invention, must still be subject to appended claims institute defender.
Claims (10)
- A kind of 1. data transmission system using two rank memories processing packet data, which is characterized in that the data transmission system It includes at least：One server, wherein further including：One service processing module is at least a target data to be divided into multiple data blocks and divide the respectively data block One packet data；AndOne service transmission module sends the number to broadcast package using at least one set in order according to certain frequency or speed According to block, wherein, each packet of mending that respectively the multicast package includes the packet data and transmitted to receive the respectively client please It asks, merges respectively benefit packet request of repetition, and corresponding respectively multicast package is sent according to those benefit packet requests；AndOne client, wherein further including：One buffering area；One client's store media；One client transmission module, to ask to add in a multicast group and to be configured one in the buffering area to the server Memory headroom receives at least one set and broadcasts package, and the packet data in the respectively multicast package is written to pair in the memory headroom Answer position；AndOne client's processing module, to judge that those packet datas stored by the memory headroom have formed complete at least one number During according to block, the respectively data block is moved to by the buffering area in client's store media and to be stored according to the client When the identification data of those stored data blocks judge that those data blocks are discontinuous in media, pass through the client transmission mould Block notifies the server and the identification data according to those data blocks stored in client's store media to judge the client Store media notifies the client transmission module to exit the multicast group when having stored complete object data.
- 2. as described in claim 1 using the data transmission system of two rank memories processing packet data, which is characterized in that should Client data transfers module more adds in those multicast packages received in the multicast group latter predetermined time to abandon.
- 3. as described in claim 1 using the data transmission system of two rank memories processing packet data, which is characterized in that should More to foundation, respectively the benefit packet asks requested multicast package to abandon transmission sequence preceding a certain number of to service transmission module Respectively the benefit packet is asked.
- 4. as described in claim 1 using the data transmission system of two rank memories processing packet data, which is characterized in that should Service transmission module is more to fair according to the selection of the transmission times of the client terminal quantity in the multicast group and/or the target data Perhaps or refuse the client and add in the multicast group.
- 5. a kind of data receiver method using two rank memories processing packet data, applied to a client, the client packet It containing a buffering area and client's store media, and is connect with a server, which is characterized in that the data receiver method includes at least The following steps：It asks to add in a multicast group to the server；A memory headroom is configured in the buffering area；It receives at least one set that the server is transmitted and broadcasts package, and the memory is written into the packet data in the respectively multicast package Corresponding position in space；When judging that those packet datas stored by the memory headroom have formed a complete at least data block, by the buffering area In mobile respectively data block to client's store media；Identification data according to those data blocks stored in client's store media judge that those data blocks are discontinuous When, transmission is asked with the corresponding packet of mending of those discontinuous data blocks to the server；AndIdentification data according to those data blocks stored in client's store media judge that client's store media has been stored up The multicast group is exited when depositing complete object data.
- 6. as claimed in claim 5 using the data receiver method of two rank memories processing packet data, which is characterized in that should Data receiver method is before the step of packet data in the respectively multicast package is written the corresponding position in the memory headroom, more The step of comprising those multicast packages received in the predetermined time are abandoned.
- 7. as claimed in claim 5 using the data receiver method of two rank memories processing packet data, which is characterized in that will The step of corresponding position that respectively packet data in the multicast package is written in the memory headroom, which further includes, judges the memory headroom When having expired, the step of deleting storage time packet data at most.
- 8. a kind of data transmission method, applied to a server, which provides the connection of an at least client, and feature exists In the data transmission method includes at least the following steps：One target data is divided into multiple data blocks, and it is an at least packet data to divide the respectively data block；It receives the group that is transmitted of the client and adds in request, and according to the quantity of those clients and the target data Transmission times allows or refuses the client to add in a multicast group；AndThe following steps are repeated until the target data has repeated to send certain number or those clients all exit the multicast group：With sequential selection one data block of certain frequency or speed by each data block in target data；Package is broadcast using at least one set and sends the selected data block, and respectively the multicast package includes the packet data；Merge each of the repetition that respectively client is transmitted and mend packet request；AndCorresponding respectively multicast package is sent according to those benefit packet requests.
- 9. data transmission method as claimed in claim 8, which is characterized in that the data transmission method is in merging each client After the step of respectively benefit packet request of the repetition transmitted, further including discarding transmission sequence please in preceding a certain number of respectively benefit packets Seek step.
- 10. data transmission method as claimed in claim 8, which is characterized in that used in order with certain frequency or speed At least one set broadcast package send the data block the step of further include compress the data block the step of.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611144822.2A CN108234327A (en) | 2016-12-13 | 2016-12-13 | Data transmission system, data receiver method and data transmission method |
Applications Claiming Priority (1)
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