CN104661291A - Energy saving method for WiFi access device based on traffic filtering and Web cache prefetching - Google Patents

Energy saving method for WiFi access device based on traffic filtering and Web cache prefetching Download PDF

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Publication number
CN104661291A
CN104661291A CN201510108379.2A CN201510108379A CN104661291A CN 104661291 A CN104661291 A CN 104661291A CN 201510108379 A CN201510108379 A CN 201510108379A CN 104661291 A CN104661291 A CN 104661291A
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CN
China
Prior art keywords
access device
wifi access
web
cache prefetching
http request
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
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CN201510108379.2A
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Chinese (zh)
Inventor
谢怡
杨李冬
罗夏朴
孙锡龙
王宇翔
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Xiamen University
Shenzhen Research Institute of Xiamen University
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Xiamen University
Shenzhen Research Institute of Xiamen University
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Publication date
Application filed by Xiamen University, Shenzhen Research Institute of Xiamen University filed Critical Xiamen University
Priority to CN201510108379.2A priority Critical patent/CN104661291A/en
Priority to CN201510262134.5A priority patent/CN105007613B/en
Publication of CN104661291A publication Critical patent/CN104661291A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02Power saving arrangements
    • H04W52/0203Power saving arrangements in the radio access network or backbone network of wireless communication networks
    • H04W52/0206Power saving arrangements in the radio access network or backbone network of wireless communication networks in access points, e.g. base stations
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00Network architectures or network communication protocols for network security
    • H04L63/02Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
    • H04L63/0227Filtering policies
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00Network arrangements or protocols for supporting network services or applications
    • H04L67/01Protocols
    • H04L67/02Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/10Flow control between communication endpoints
    • H04W28/14Flow control between communication endpoints using intermediate storage
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention relates to an energy saving method for a WiFi access device based on traffic filtering and Web cache prefetching. When one HTTP request is transmitted to a remote Web server by the WiFi access device, TCP links are divided into two sections, namely the first-section TCP links are connected with the WiFi access device and AP and the second-section TCP links are connected with the AP and the Web server; the AP receives the HTTP request and checks the cache through the first-section TCP links, if corresponding response data are present in the AP buffer, the response data are returned to the WiFi access device; otherwise, the HTTP request is transmitted to the Web server through the second-section TCP links; after the AP receives the response of the Web server, the response data of the requested webpage are collected, are filtered through preset flow control rules, and then the filter data are stored into the AP buffer, and returned to the WiFi access device through the first-section TCP links; the WiFi access device enters the dormant state when the data are not received and dispatched.

Description

A kind of WiFi access device power-economizing method based on traffic filtering and Web cache prefetching
Technical field
The present invention relates to wireless network data transmission field, more particularly, relate to a kind of WiFi access device power-economizing method based on traffic filtering and Web cache prefetching.
Background technology
Along with wireless network application increases, WiFi access device needs to consume more multi-energy and calculates and communication service, battery continuous service time (cruising time) obviously shortens, and wherein shared by network communication interface card, CPU and LCD, energy consumption ratio is higher.Emerging in large numbers of new network application makes the energy throughput bottleneck of WiFi access device become clear day by day, and battery capacity annual growth is only 5%.Under IEEE 802.11 standard, WiFi access device, intercepting and leave unused a large amount of electric energy of state consumption waited for, shows the problem of energy poor efficiency especially.Therefore, the WiFi access device of finite energy is difficult to meet growing Information Mobile Service demand, and this certainly will become the obstacle of wireless network development.
WLAN (wireless local area network) (Wi-Fi) has become the important channel that user obtains Internet resources, by the data flow of AP based on Web service.As shown in Figure 1, the web access pattern of AP and the WiFi access device of prior art, first WiFi access device sends HTTP request; Then, AP communicates that request to distant place Web server.When after the response page receiving Web server, AP sends WiFi access device to it.Afterwards, this page of WiFi access device process, and send more request, and download the Web object that this page comprises, as picture, CSS, JS script etc.Because a page often comprises these Web objects many, WiFi access device needs repeatedly to send Web request and downloads them, until all objects are downloaded, the browser on WiFi access device is can completely display full page.As can be seen here, in whole process, WiFi access device can only carry out of short duration rest after the request is sent before receiving reply.In addition, the switching constantly producing request and continuous wake-up frequently all needs lot of energy.
Existing power-saving technology mainly utilizes the dormancy of WiFi access device and power management to reduce energy consumption, Power Save Mode (PSM) mechanism of such as IEEE 802.11 agreement.The network interface unit (WNIC) of WiFi access device generally supports four kinds of states: send (Transmission), reception (Reception), idle (Idle) and dormancy (Sleep).First three kind state all consumes high power, and the power of resting state then reduces 1 to 2 orders of magnitude.Therefore, PSM sets the dormancy period of WiFi access device, reduces transmission energy consumption.But standard P SM lacks adaptivity, can reduce transmission performance and service quality.Such as, dormancy and the bag buffer memory of PSM increase Packet Delay, and serious time delay also can cause the disorder of the flow control of TCP transmitting terminal and congestion control, the final throughput reducing data.
Prior art proposes multiple PSM and improves mechanism to take into account energy and transmission performance, is mainly divided into two classes.The first kind is the distributed sleep power-saving mechanism being deployed in WiFi access device.In order to conserve energy, equipment independently determines oneself protocol parameter and transmission operation, and relevant setting is noticed to AP.This kind of algorithm can adapt to the data traffic change of individual equipment mostly, reduces even minimization device energy consumption.Its shortcoming is the increase in complexity and the amount of calculation of WiFi access device, and the factors such as ignoring channel competition and data packet collisions are on the impact of other equipment.Equations of The Second Kind disposes with an emphasis the centralized control formula dormancy mechanism at AP, and its target is the energy-optimised and fairness of the overall situation, instructs the running of WiFi access device and the setting of important protocol parameter, and notice these settings to all devices.But the dispatching algorithm that the many employings of centralized power-saving mechanism are careful, comparatively large to the transmitting procedure amendment of WiFi access device, contact closely with network topology structure, be difficult to existing standard compatible.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, under a kind of condition ensureing network availability and satisfied transmission demand is provided, reducing the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching of the energy ezpenditure of WiFi access device.
Technical scheme of the present invention is as follows:
A kind of WiFi access device power-economizing method based on traffic filtering and Web cache prefetching, when WiFi access device sends a HTTP request to long-range Web server, TCP link is divided into two sections: first paragraph TCP links connection WiFi access device and AP, second segment TCP link connects AP and Web server;
AP is linked by first paragraph TCP and receives HTTP request and check buffer memory, if AP is cached with corresponding response data, response data is returned WiFi access device; Otherwise, by second segment TCP link, this HTTP request is sent to Web server; After AP receives web server response, collect the response data of institute's requested webpage, and filtered by the traffic control rule preset, then stored in AP buffer memory, and return WiFi access device by first paragraph TCP link;
When WiFi access device does not have a data transmit-receive, enter resting state.
As preferably, after AP returns filtration to the WiFi access device batch of resting state and stored in the response data of institute's requested webpage of AP buffer memory.
As preferably, AP periodically returns response data to the WiFi access device of resting state batch.
As preferably, AP carries out message transmission rate self adaptation, according to current wireless Local Area Network channel situation, returns response data to WiFi access device.
As preferably, arranging AP is proxy server, and WiFi access device is proxy server with AP, asks Web server.
As preferably, by Split-TCP order, TCP link is divided into two sections.
As preferably, if AP buffer memory does not exist the response data of HTTP request, then WiFi access device enters resting state, and is linked by second segment TCP and forward HTTP request to Web server; The maintenance activity always of HTTP request between WiFi access device and AP.
As preferably, the data of AP buffer memory are obtained by cache prefetching method, and cache prefetching method comprises forecasting method, caching method; Wherein, forecasting method is: simulation browser is resolved after the page, finds out other Web objects of needing to be embedded in this page and carries out the behavior of downloading.
As preferably, when carrying out buffer memory, the domain name of not yet resolving in the page will convert IP to, and retain the corresponding relation of domain name and IP.
As preferably, the traffic control rule preset sets, and will be filtered the HTTP request to advertising message sent from WiFi access device.
Beneficial effect of the present invention is as follows:
The present invention adopts Spilt-TCP technology, take AP as network agent, dispose look ahead buffer memory and the traffic filtering algorithm that are applicable to wireless Web access, improve energy efficiency: by reducing request number and structure batch data stream, control the flow rate mode mailing to the response data of WiFi access device, extend the PSM resting state of WiFi access device with conserve energy, ensure Terminal Service quality simultaneously.By buffer memory useful data object and filtering useless data object, reduce the transmission process time of WiFi access device.
The present invention is towards WiFi environment, for the Web application accounting for main flow, design is applicable to the Energy Saving Strategy of WLAN (wireless local area network) web data traffic characteristic, by device energy conservation, data buffer storage/look ahead, the factors such as traffic filtering are taken into consideration, realize the optimization to multi objective such as WiFi access device energy consumption, time delays.
The present invention fully expands the center controlling functions of AP, only needs to upgrade to AP, WiFi access device, and does not affect nucleus equipment and existing network application protocol, has the advantages that to be convenient to dispose and robustness is good.
Accompanying drawing explanation
Fig. 1 is the access module of the WiFi access device of prior art;
Fig. 2 is the access module of WiFi access device of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
The object of the invention is the energy bottleneck problem solving WiFi access device in WLAN (wireless local area network).By improving the Energy Saving Strategy of IEEE 802.11 agreement, give full play to the center control action of AP (wireless access points), utilize the control technology of Web cache prefetching and traffic filtering, under the condition ensureing network availability and satisfied transmission demand, reduce the energy ezpenditure of wireless portable devices.
Method of the present invention is energy-conservation based on the WiFi access device of traffic filtering and Web cache prefetching, and be set to take AP as proxy server, WiFi access device take AP as proxy server, asks Web server.
As shown in Figure 2, AP is as the network agent supporting Split-TCP, when WiFi access device sends a HTTP request to long-range Web server, by Split-TCP order, TCP link is divided into two sections: first paragraph TCP links connection WiFi access device and AP, second segment TCP link connects AP and Web server;
AP is linked by first paragraph TCP and receives HTTP request and check buffer memory, if AP is cached with corresponding response data, response data is returned WiFi access device; Otherwise, by second segment TCP link, this HTTP request is sent to Web server; After AP receives web server response, collect the response data of institute's requested webpage, and filtered by the traffic control rule preset, then stored in AP buffer memory, and return WiFi access device by first paragraph TCP link;
When WiFi access device does not have a data transmit-receive, enter resting state.
In the present embodiment, dispose a Web cache prefetching instrument at AP and can reduce Web service response time and WiFi access device energy consumption.After AP receives the HTTP request of WiFi access device, if find its response data object in the buffer, then with network at that time optimal rate send continuously.After response data all sends, AP notifies that WiFi access device enters resting state with energy savings.The present invention, by AP cache prefetching, avoids extranet access frequently, decreases the response time of web access; Avoid WiFi access device to enter high-power idle wait state, increase dormancy time and carry out conserve energy; The simultaneously effective energy dissipation reducing the data packet retransmission that causes due to time-out and bring.
If AP can not find the response data of HTTP request in the buffer, then notify that WiFi access device enters resting state with conserve energy, and linked to Web server forwarding HTTP request by second segment TCP.HTTP request maintenance activity always simultaneously between WiFi access device and AP, can return response data smoothly after AP, avoids the energy dissipation of rebuilding link.When AP obtains response data from Web server, first by flow control algorithm, after filtering out useless data, carry out buffer memory and forwarding again.
AP to return after filtration and stored in the response data of institute's requested webpage of AP buffer memory to the WiFi access device batch of resting state.AP when sending response data to WiFi access device, Batch sending data as much as possible and reduce and send useless data.In the present embodiment, AP periodically returns response data to the WiFi access device of resting state batch.AP can receive or forward the HTTP request of WiFi access device, and by control ACK sending mode and buffer memory prefetch mechanisms, the flow rate mode of reconstruct response data, forms periodic batch data.Meanwhile, AP adopts message transmission rate adaptive technique, according to current wireless Local Area Network channel situation, returns response data to WiFi access device, retransmits to avoid packet loss the energy dissipation brought.
Therefore, traffic filtering algorithm isolates hash in original response data, effectively reduces the energy ezpenditure that transmission quantity reduces WiFi access device.
Present invention improves over the PSM dormancy mechanism of IEEE 802.11 agreement.Standard P SM mechanism may cause WiFi access device frequently to wake up and channel competition, makes WiFi access device be in high-power idle state for a long time, waste energy.The present invention utilizes the data flow characteristic of Web network application to improve PSM dormancy mechanism, makes it better adapt to the change of WiFi wireless channel and network traffics.According to factors such as transmitted data amount, QoS demand and number of devices, PSM dormancy mechanism is regulated, use the technology such as Split-TCP, data pre-fetching buffer memory and flow rate mode reconstruct to improve WiFi access device energy efficiency further simultaneously.
In IEEE 802.11 agreement, AP is responsible for forwarding the data of coming and going with WiFi access device.When the dormancy of WiFi access device, AP needs data cached bag, forms the extra latency of packet and ACK.Serious time delay also can cause the disorder of the flow control of TCP transmitting terminal and congestion control, the final throughput reducing data.In order to reduce the performance impact that the dormancy of WiFi access device brings, the present invention take AP as network agent, and adopt Split-TCP technology, the service quality making WiFi access device can obtain expectation can increase again dormancy time with conserve energy.
Existing Web looks ahead and the target of buffer memory shortens the delay of user's browsing page, and does not consider how to save equipment energy consumption.The data of AP buffer memory of the present invention are obtained by cache prefetching method, and cache prefetching method comprises forecasting method, caching method.Analysis modeling is carried out to WiFi access device Web request data stream and web server response data flow, and then obtains prefetching algorithm; Set up utility function simultaneously, and under the constraint that AP buffer memory is limited, utilize buffer memory replacement and traffic filtering to realize multi-index optimization such as energy consumption, time delay and hit rates.Utilize the characteristic of Web agreement to carry out net control flow, reduce Useless object transmission, thus reduce the energy consumption of WiFi access device.
The Web forecasting method of prior art is predict according to the access history of user the Web object that user will access mostly.But historical data might not total energy obtain, as when system just brings into operation time, the not historical information of user.The access habits of user, also can change to the interest of website simultaneously.
Forecasting method of the present invention is: simulation browser is resolved after the page, finds out other Web objects of needing to be embedded in this page and carries out the behavior of downloading.The Web object comprised by analyzing the page improves the efficiency that Web looks ahead.When browser resolves after a page, other Web objects of needing to be embedded in this page will be found out and download.The behavior of simulation browser of the present invention is found out these Web objects and looks ahead.When the Bandwidth-Constrained of AP, browser by these Web objects play up order and size designs the most effective prefetching algorithm.
Caching method is: after downloading various Web object, determine which object will be placed into the buffer memory of AP, and which will be transferred out by cache algorithm at the object of buffer memory.The caching method primary consideration of prior art is by the frequency used, and the out-of-service time, the factors such as size, but do not consider the cost of how to save energy consumption He looking ahead.Caching method of the present invention considers above-mentioned all factors, adopts new cache algorithm.If a Web object and embedded Web object exist all, the probability that so they are transferred out will reduce; If the acquisition of a Web object needs to carry out a large amount of HTTP request redirect, the recalling probability and will reduce of this object.When carrying out buffer memory, the domain name of not yet resolving in the page will convert IP to, and retain the corresponding relation of domain name and IP.So also can reduce the energy that WiFi access device carries out required for dns resolution.Afterwards, webpage and its embedded Web object can be encoded, issue WiFi access device by the pattern of the Data URI Scheme of HTTP.Benefit is that WiFi access device once can receive all information, thus avoids repeatedly sending HTTP request.
In addition, the traffic control rule preset sets, and will be filtered, and can reduce energy consumption further to the HTTP request to advertising message sent from WiFi access device.
Meanwhile, the characteristic and the WLAN Link State that the present invention is directed to WiFi access device are optimized.If compact model supported by the browser of WiFi access device, all information will be compressed before sending.If limited display rate only supported by browser, will adjust image and compress.If Web object comprises multimedia video, adaptive coding and compression will be carried out to the video prestored.When WiFi access device electricity is low or link transmission is unstable, coding that cost is less and compress technique can be selected.Such as, H.263+ the energy consumption of Low Bit-Rate Video Coding standard is just starkly lower than MPEG-4 and Windows Media.Up-to-date H.264 Scalable Video Coding (SVC) technology also achieves the expansion of video quality, can produce the decoded video of different frame rates, resolution or credit rating.Therefore, when meeting video quality and network application demand, energy-optimised mechanism by selecting coding compression algorithm, will minimize the total energy consumption (comprise the calculating energy consumption for decoding and decompressing, and transfer of data energy consumption) of wireless portable devices.
Above-described embodiment is only used to the present invention is described, and is not used as limitation of the invention.As long as according to technical spirit of the present invention, change above-described embodiment, modification etc. all will be dropped in the scope of claim of the present invention.

Claims (10)

1. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching, it is characterized in that, when WiFi access device sends a HTTP request to long-range Web server, TCP link is divided into two sections: first paragraph TCP links connection WiFi access device and AP, second segment TCP link connects AP and Web server;
AP is linked by first paragraph TCP and receives HTTP request and check buffer memory, if AP is cached with corresponding response data, response data is returned WiFi access device; Otherwise, by second segment TCP link, this HTTP request is sent to Web server; After AP receives web server response, collect the response data of institute's requested webpage, and filtered by the traffic control rule preset, then stored in AP buffer memory, and return WiFi access device by first paragraph TCP link;
When WiFi access device does not have a data transmit-receive, enter resting state.
2. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 1, is characterized in that, after AP returns filtration to the WiFi access device batch of resting state and stored in the response data of institute's requested webpage of AP buffer memory.
3. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 2, is characterized in that, AP periodically returns response data to the WiFi access device of resting state batch.
4. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 2, it is characterized in that, AP carries out message transmission rate self adaptation, according to current wireless Local Area Network channel situation, returns response data to WiFi access device.
5. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 1, it is characterized in that, arranging AP is proxy server, and WiFi access device is proxy server with AP, asks Web server.
6. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 1, is characterized in that, by Split-TCP order, TCP link is divided into two sections.
7. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 1, it is characterized in that, if there is not the response data of HTTP request in AP buffer memory, then WiFi access device enters resting state, and links to Web server forwarding HTTP request by second segment TCP; The maintenance activity always of HTTP request between WiFi access device and AP.
8. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 1, it is characterized in that, the data of AP buffer memory are obtained by cache prefetching method, and cache prefetching method comprises forecasting method, caching method; Wherein, forecasting method is: simulation browser is resolved after the page, finds out other Web objects of needing to be embedded in this page and carries out the behavior of downloading.
9. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 8, it is characterized in that, when carrying out buffer memory, the domain name of not yet resolving in the page will convert IP to, and retain the corresponding relation of domain name and IP.
10. the WiFi access device power-economizing method based on traffic filtering and Web cache prefetching according to claim 1, is characterized in that, the traffic control rule preset sets, and will be filtered the HTTP request to advertising message sent from WiFi access device.
CN201510108379.2A 2015-03-12 2015-03-12 Energy saving method for WiFi access device based on traffic filtering and Web cache prefetching Pending CN104661291A (en)

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