CN106657362A - Terminal content scheduling method for novel virtual multi-path TCP - Google Patents

Terminal content scheduling method for novel virtual multi-path TCP Download PDF

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Publication number
CN106657362A
CN106657362A CN201611257209.1A CN201611257209A CN106657362A CN 106657362 A CN106657362 A CN 106657362A CN 201611257209 A CN201611257209 A CN 201611257209A CN 106657362 A CN106657362 A CN 106657362A
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node
file
download
downloading
request
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CN106657362B (en
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徐恪
张宇超
沈蒙
葛志诚
王翔翔
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Tsinghua University
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Tsinghua University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/2866—Architectures; Arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/56—Provisioning of proxy services
    • H04L67/566—Grouping or aggregating service requests, e.g. for unified processing

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

Abstract

The invention discloses a terminal content scheduling method for a novel virtual multi-path TCP. The terminal content scheduling method comprises the following steps of: obtaining a file downloading request of any node in a wireless local area network, wherein the file downloading request includes a requested downloaded file and a downloading requirement; searching a candidate node set, where the requested downloaded file is stored, from a FileTable, and selecting the optimal downloading node according to the downloading condition; if the fact that the optimal downloading node independently downloads the requested downloaded file does not satisfy the downloading requirement, selecting a suboptimal downloading node from the candidate node set till the fact that all selected downloading nodes perform common transmission satisfies the downloading requirement; starting all the selected downloading nodes, performing file transmission to a node sending the downloading request by adopting a virtual multi-path TCP; and, after file transmission is completed, updating storage file information of all nodes in the wireless local area network. The terminal content scheduling method disclosed by the invention has the advantage that: the file downloading time of a terminal in a local area network is greatly shortened.

Description

A kind of terminal content dispatching method of New Virtual multipath TCP
Technical field
The present invention relates to Internet technical field, and in particular to a kind of terminal content dispatching party of New Virtual multipath TCP Method.
Background technology
With the fast development of social networks, the user in same wireless local web area has shown very related text Part downloads interest, therefore, the going out of CDN technologies be now able to for the file download of single terminal user provide closer to uploading nodes. However, the point-to-point transmission based on conventional TCP can only set up a connection, in the case of source uploading bandwidth deficiency, can make Into the waste of downloading end bandwidth resources, cause download time elongated.
The proposition of multipath TCP concepts solves to a certain extent the problems referred to above, but multipath TCP requires the double of transmitting procedure At least folk prescription is that have one piece with card of surfing Internet in side, sets up a plurality of TCP transmission path with this, common transport text document, To accelerate the file downloading speed of destination.But in general WLAN, it is difficult to ensure that multiple terminals have one piece with Card of surfing Internet, therefore, the exploitativeness of traditional multi-path TCP protocol in deployment is not strong.
The content of the invention
It is contemplated that at least solving one of above-mentioned technical problem.
For this purpose, it is an object of the invention to proposing a kind of terminal content dispatching method of New Virtual multipath TCP, lifting is more Exploitativeness of the footpath Transmission Control Protocol in deployment.
To achieve these goals, embodiment of the invention discloses that a kind of terminal content of New Virtual multipath TCP is adjusted Degree method, comprises the following steps：S1：The file download request of any node in WLAN is obtained, the file download please Ask and download file and downloading request including request；S2：There is candidate's section that file is downloaded in the request from FileTable table search Point set, according to the network condition of both candidate nodes optimal download node is selected, wherein, prestore in the FileTable tables There are the storage file information and network condition information of all nodes in the WLAN；S3：Judge the optimal download section Point individually downloads the request and downloads whether file meets the downloading request；S4：If under the optimal download node is independent Carry it is described request download file be unsatisfactory for the downloading request, then from the both candidate nodes set select suboptimum download node to The node for sending file download request carries out file transmission, until selectively downloading node common transport meets described Downloading request；S5：Update the storage file information of all nodes in the WLAN.
The terminal content dispatching method of New Virtual multipath TCP according to embodiments of the present invention, can be transmission choosing every time Multiple data sources are selected, the connection of each source and purpose is invented the paths in multi-path TCP protocol, multiple data sources are adopted Multi-path TCP protocol common transport text document.Unified tune is done by the access point (Access Point, AP) in WLAN Degree, terminal document transmission is set up on virtual multipath TCP, substantially reduces the file download time.
In addition, the terminal content dispatching method of New Virtual multipath TCP according to the above embodiment of the present invention, can also have There is following additional technical characteristic：
Further, the downloading request completes deadline including download.
Further, also included before step S1：Check focus file in the respective nodes of the WLAN It is whether stored；The communication distance refreshed between all nodes of the WLAN and access point and wireless network environment State, and calculate fading channel ratio.
Further, step S2 is further included：S201：According to the uploading bandwidth and attenuation ratio meter of all both candidate nodes Calculate the corresponding value of utility of all both candidate nodes；S202：Select maximum from the corresponding value of utility of all both candidate nodes It is worth corresponding both candidate nodes for the optimal download node.
Further, also include：Connection is set up in the node of the optimal download node and the transmission download request simultaneously Create Hash shared key；The node of selectively downloading carries out file and is transmitted across to the node of the transmission download request The Hash shared key used in journey.
Further, step S4 also includes：The monitoring startup selectively downloads node to transmission download request Node carries out the network connection state that file transmission is；If node opens network connection in file Transmission, then from described Other both candidate nodes are selected to complete network transmission in both candidate nodes set, under completing before the download completes deadline Carry.
The additional aspect and advantage of the present invention will be set forth in part in the description, and partly will become from the following description Obtain substantially, or recognized by the practice of the present invention.
Description of the drawings
The above-mentioned and/or additional aspect and advantage of the present invention will become from the description with reference to accompanying drawings below to embodiment It is substantially and easy to understand, wherein：
Fig. 1 is the flow chart of the terminal content dispatching method of the New Virtual multipath TCP of the embodiment of the present invention；
Fig. 2 is the incidence relation schematic diagram in one embodiment of the invention between wireless terminal and access point；
Fig. 3 is that uploading nodes are left after LAN in one embodiment of the invention, reselects showing for new node addition It is intended to.
Specific embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from start to finish Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
With reference to explained below and accompanying drawing, it will be clear that these and other aspects of embodiments of the invention.In these descriptions In accompanying drawing, specifically disclose some particular implementations in embodiments of the invention to represent the enforcement for implementing the present invention Some modes of the principle of example, but it is to be understood that the scope of embodiments of the invention is not limited.Conversely, the present invention Embodiment includes all changes, modification and the equivalent fallen in the range of the spirit and intension of attached claims.
Below in conjunction with the Description of Drawings present invention.
Fig. 1 is the flow chart of the terminal content dispatching method of the New Virtual multipath TCP of the embodiment of the present invention.Such as Fig. 1 institutes Show that the terminal content dispatching method of kind New Virtual multipath TCP according to embodiments of the present invention is comprised the following steps：
S1：The file download request of any node in WLAN is obtained, file download request includes the lower published article of request Part and downloading request.
Specifically, as certain node niWhen needing to carry out file download, to access point (Access Point, AP) ternary is sent Group { file name, file size s, deadline d }.
In one embodiment of the invention, downloading request completes deadline including download.Ask from file download Moment, complete deadline to download and terminate, to download speed situations such as give a downloading request.
In one embodiment of the invention, also included before step S1：
Check whether focus file is stored in the respective nodes of WLAN.
The communication distance refreshed between all nodes and access point of WLAN and the state of wireless network environment, and Calculate fading channel ratio.
Specifically, in a certain WLAN, access point AP maintenance documentation list FileTable record focus file It is whether stored in each terminal.As shown in table 1：
Files Size Nodes
File_1 S_1 nj,nk,……
…… …… ……
File_i S_i np,nq,……
…… …… ……
File_n S_n nw,nm,……
Table 1n parts file storage record on different nodes
The communication distance r refreshed between each node and AP, quantifies state e of node wireless network environment, calculates channel and declines Subtract ratio beta (β depends on the wireless network environment of node).
S2：There is the both candidate nodes set that file is downloaded in request from FileTable table search, according to the network of both candidate nodes Situation selects optimal download node.Wherein, the storage text of all nodes in WLAN is previously stored with FileTable tables Part information and network condition information.
In one embodiment of the invention, step S2 is further included：
S201：The corresponding effectiveness of all both candidate nodes is calculated according to the uploading bandwidth and attenuation ratio of all both candidate nodes Value.That is AP search FileTable tables, find the both candidate nodes set for having this document, according to node residue uploading bandwidth uB with Attenuation ratio β (β depends on the wireless network environment of node), calculates both candidate nodes njRespective value of utility μj：
μj=uB × β
S202：The corresponding both candidate nodes of maximum are selected to be optimal download section from the corresponding value of utility of all both candidate nodes Point.
S3：Judge that the independent download request of optimal download node downloads whether file meets downloading request.
Specifically,
According to transfer rate, calculate whether this document can complete to pass within file download deadline according to below equation It is defeated：
Wherein, s represents file size, and d represents that the deadline for downloading the deadline is required.
S4：If the independent download request of optimal download node downloads file and is unsatisfactory for downloading request, from both candidate nodes collection Select suboptimum to download node in conjunction carries out file transmission to the node for sending file download request, until selectively downloading section Point common transport meets downloading request.
Specifically, if file transmission time≤d, represent individually download file download using optimal download node can be Transmission is completed in file download deadline.File transmission time>D, then represented and only individually downloaded not by optimal download node Transmission can be completed within file download deadline.
Choose value of utility highest node njAs the source node for initially setting up connection, generate with the node of demand file and pass Defeated key, starts in optimal download node and sends the node n of file download requestiBetween set up connection.If ω is offer file The node set of upload, then now, ω={ nj}。
Further, njFirst to download host niA TCP SYN message is sent, in the MPTCP option words of TCP header MP_CAPABLE signals are write in section.niA SYN+ACK response is returned, a MP_ is included equally in MPTCP Option Fields CAPABLE signals.
niWith njSession complete TCP and MTCP handshake procedures first by ACK and MP_CAPABLE signals, it is ensured that two ends It is obtained for the MPTCP session datas of other side.In follow-up whole conversation procedure, the session that two end main frames have exchanged 64 is close Key, while Hash shared key key of each self-generating one 32.
Subsequently from reselection suboptimum both candidate nodes in both candidate nodes set, (i.e. current candidate downloads value of utility maximum in node Node) carry out file transmission jointly, and determine whether can to complete within file download deadline transmission, if can not Then continue to select both candidate nodes until transmission can be completed within file download deadline.Now, the multiple stage node chosen Set ω=ω+nk, the polylith network interface card of a machine in conventional multipath TCP has been invented, every TCP connection is invented Strip connection under this multipath TCP.According to conventional multipath Transmission Control Protocol, data distribution single subflow amount, every machine are given Device is responsible for transmitting the partial content of this document.
From ω for the angle of multiple source nodes, data flow cutting of the embodiments of the invention this document downloading task Into data block one by one, then individual data block is encapsulated in single subflow amount.From download node niAngle for, this Inventive embodiment have collected the data block in TCP subflow amounts, and be reassembled into original data stream.
In one embodiment of the invention, step S4 also includes：
Monitoring startup is selectively downloaded node and carries out the network company that file transmission is to the node for sending download request Connect state.
If node opens network connection in file Transmission, then other both candidate nodes are selected from both candidate nodes set Network transmission is completed, completes to download before completing deadline with download.
S5：Update the storage file information of all nodes in WLAN.Send download request and download file Node afterwards stores this document, when have again demand is downloaded to this document when, that the node is combined as candidate is newest Node.
The terminal content dispatching method of the New Virtual multipath TCP of the embodiment of the present invention, in LAN document transmission process It is central, each wireless terminal node is invented one piece of network interface card in multipath TCP, by multiple node virtuals into a main frame, build Found virtual multipath TCP so that multiple source node common transport text documents, so as to make full use of the download bandwidth of destination node, Transmission speed is lifted, shortens the file download time.
In order to it is further understood that the present invention, will be described in detail by following examples.
Fig. 2 is the incidence relation schematic diagram in one embodiment of the invention between wireless terminal and access point.Such as Fig. 2 institutes Show there are 10 wireless terminal n in certain WLAN in the range of an AP1,…,n10.Table 2 is the status information table that AP is safeguarded, And real-time update.Recording content is respectively：The attenuation ratio β for each communicating between AP, each node uploading bandwidth uB, lower carrier band Wide dB.
β1 β2 β3 β4 β5 β6 β7 β8 β9 β10
1 0.5 0.7 0.3 0.4 0.8 0.6 0.8 0.9 0.8
uB1 uB2 uB3 uB4 uB5 uB6 uB7 uB8 uB9 uB10
5(Mbps) 5 5 10 7 5 6 3 3 4
dB1 dB2 dB3 dB4 dB5 dB6 dB7 dB8 dB9 dB10
10(Mbps) 8 12 5 9 12 15 10 5 8
Communication attenuation ratio table between the terminal of table 2 and AP
If having two parts of files File_1 and File_2 in the LAN, the storage condition in terminal is as shown in table 3.
Files Size Nodes
File_1 100M n2,n3,n5,n7,n8,n10
File_2 50M n1,n3,n4,n6,n8,n9
Storage record sheet of the 3 two parts of files of table in ten terminals
AP monitor terminals are asked, and receive n1Download request to file File_1, i.e. n1Triple { filename is sent to AP Claim, file size s, deadline d={ File_1,100M, 12s }.
AP searches FileTable tables, obtains 6 both candidate nodes, then calculate the value of utility μ of this 6 both candidate nodes respectively, ties Fruit is as shown in table 4.
μ2 μ3 μ5 μ7 μ8 μ10
2.5 3.5 2.8 3.6 2.4 3.2
The both candidate nodes value of utility table of table 4
AP chooses value of utility highest n7As download node n1Source node.Now, ω={ n7}。
Calculate estimated download time：
Choose node n3As second data source, with n1Set up son connection.Now, ω={ n7,n3}。
Calculate again
Then repeat said process again, choose n10As the connection of another strip.
n1With n7Between complete TCP and MTCP handshake procedures first by ACK and MP_CAPABLE signals, 64 sessions are close The exchange process of key, then Hash shared key key of each self-generating one 32.n7, n10With n1Son connection still through TCP The TCP SYN of head MPTCP fields exchange to generate flow.Wherein, the MP_JOIN values in MPTCP fields are shared comprising Hash Key key, newly-generated TCP sessions and original session are associated.So far, the foundation of MPTCP is completed.
The downloading task of the 100M files is cut into data block one by one, then individual data block is encapsulated into three differences Subflow amount in.n1Node have collected three using the terminal content dispatching method of the New Virtual multipath TCP of the embodiment of the present invention Data block in bar TCP subflow amounts, and in n1Node is reassembled into original document.
Fig. 3 is that uploading nodes are left after LAN in one embodiment of the invention, reselects showing for new node addition It is intended to.As shown in Figure 3, it is assumed that after transmission 3s, n10The LAN is have left, causes the New Virtual multipath of the embodiment of the present invention A sublink in the terminal content dispatching method of TCP disconnects.Remaining 100M-10.3M/s × 3s=69.1M files need n3→n1、n7→n1It is transmitted in two single sub paths, calculates the time.
Add subpath n5→n1, it is contemplated that the time：
Then file continues in n3→n1、n7→n1、n5→n1Three single sub paths are uploaded to transport to and completed, and 3+6.98=is taken altogether 9.98s.If not adopting the method for the present invention, file can only be transmitted between a pair of nodes, most short time-consumingThen in the middle of the implementation process, the present invention proposes virtual multipath TCP, establishes a plurality of connection, improves 2.8 times Transmission speed, substantially reduce the download time of file.
In addition, other of the terminal content dispatching method of the New Virtual multipath TCP of the embodiment of the present invention are constituted and made With being all for a person skilled in the art known, in order to reduce redundancy, do not repeat.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described Point is contained at least one embodiment of the present invention or example.In this manual, to the schematic representation of above-mentioned term not Necessarily refer to identical embodiment or example.And, the specific features of description, structure, material or feature can be any One or more embodiments or example in combine in an appropriate manner.
Although an embodiment of the present invention has been shown and described, it will be understood by those skilled in the art that：Not These embodiments can be carried out with various changes, modification, replacement and modification in the case of the principle and objective that depart from the present invention, this The scope of invention is limited by claim and its equivalent.

Claims (6)

1. a kind of terminal content dispatching method of New Virtual multipath TCP, it is characterised in that comprise the following steps：
S1：The file download request of any node in WLAN is obtained, the file download request includes the lower published article of request Part and downloading request；
S2：There is the both candidate nodes set that file is downloaded in the request from FileTable table search, according to the network of both candidate nodes Situation selects optimal download node, wherein, all nodes in the WLAN are previously stored with the FileTable tables Storage file information and network condition information；
S3：Judge that the optimal download node individually downloads the request and downloads whether file meets the downloading request；
S4：If the optimal download node individually downloads the request download file and is unsatisfactory for the downloading request, from institute State and select suboptimum download node to carry out file transmission to the node of the transmission file download request in both candidate nodes set, until Selectively download node common transport and meet the downloading request；
S5：Update the storage file information of all nodes in the WLAN.
2. the terminal content dispatching method of New Virtual multipath TCP according to claim 1, it is characterised in that under described Load requires to include download and completes deadline.
3. the terminal content dispatching method of New Virtual multipath TCP according to claim 1, it is characterised in that in step Also include before S1：
Check whether focus file is stored in the respective nodes of the WLAN；
The communication distance refreshed between all nodes of the WLAN and access point and the state of wireless network environment, and Calculate fading channel ratio.
4. the terminal content dispatching method of New Virtual multipath TCP according to claim 3, it is characterised in that step S2 Further include：
S201：The corresponding effectiveness of all both candidate nodes is calculated according to the uploading bandwidth and attenuation ratio of all both candidate nodes Value；
S202：The corresponding both candidate nodes of maximum are selected from the corresponding value of utility of all both candidate nodes under the optimum Carry node.
5. the terminal content dispatching method of New Virtual multipath TCP according to claim 1, it is characterised in that also include：
Set up in the node of the optimal download node and the transmission download request and connect and create Hash shared key；
It is described selectively download node to it is described transmission download request node carry out it is described used in document transmission process Hash shared key.
6. the terminal content dispatching method of New Virtual multipath TCP according to claim 2, it is characterised in that step S4 Also include：
The monitoring startup is selectively downloaded node and carries out the network company that file transmission is to the node for sending download request Connect state；
If node opens network connection in file Transmission, then other both candidate nodes are selected from the both candidate nodes set Network transmission is completed, to complete to download before the download completes deadline.
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Cited By (3)

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CN109547505A (en) * 2019-01-26 2019-03-29 福州大学 Multipath TCP transmission dispatching method based on intensified learning
CN110708377A (en) * 2019-09-30 2020-01-17 联想(北京)有限公司 Data transmission method, device and storage medium
CN113315619A (en) * 2021-06-02 2021-08-27 清华大学 Data block deadline oriented multipath transmission control method and device

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CN105490933A (en) * 2015-12-28 2016-04-13 中国电子科技集团公司第五十四研究所 MPTCP path management method based on multi-path transmission protocol and device
CN105915466A (en) * 2016-04-15 2016-08-31 北京邮电大学 MPTCP path selection method and apparatus

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CN103957269A (en) * 2014-05-08 2014-07-30 中国联合网络通信集团有限公司 P2P network node selection method and P2P redirect server
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CN109547505A (en) * 2019-01-26 2019-03-29 福州大学 Multipath TCP transmission dispatching method based on intensified learning
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CN113315619A (en) * 2021-06-02 2021-08-27 清华大学 Data block deadline oriented multipath transmission control method and device

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