CN109511137A - A kind of big flow communication information interaction processing method based on D2D caching - Google Patents
A kind of big flow communication information interaction processing method based on D2D caching Download PDFInfo
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- CN109511137A CN109511137A CN201811446481.3A CN201811446481A CN109511137A CN 109511137 A CN109511137 A CN 109511137A CN 201811446481 A CN201811446481 A CN 201811446481A CN 109511137 A CN109511137 A CN 109511137A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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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]
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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
- H04L67/10—Protocols in which an application is distributed across nodes in the network
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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
- H04L67/50—Network services
- H04L67/56—Provisioning of proxy services
- H04L67/565—Conversion or adaptation of application format or content
- H04L67/5651—Reducing the amount or size of exchanged application data
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/70—Services for machine-to-machine communication [M2M] or machine type communication [MTC]
Abstract
The invention discloses a kind of big flow communication information interaction processing methods based on D2D caching, belong to big data processing and the field 5G.The present invention issues interested big file requirement request information by mobile subscriber；Then user demand is obtained by small base station and uploaded in data cloud；It is based on user location, moving direction and user's history mobile message again, big file is split and is encoded by MBS；Then by the file after coding is sent to cellular network base stations locating for helper mobile subscriber and user will be moved into base station；User is decoded information after receiving information, to restore former interested big file.The present invention overcomes the deficiencies in terms of data buffer storage ability in existing computing technique and cost, and SBS is organically integrated with mobile subscriber, takes full advantage of the relationship of the online and offline of mobile subscriber.Caching cost is reduced, the time required to obtaining file with target user, saves the network overhead of D2D communication.
Description
Technical field
The invention belongs to big data processing and the field 5G, in particular to a kind of big flow communication information based on D2D caching
Interaction processing method.
Background technique
In the past few decades, mobile cellular network is from pure voice system to current forth generation (4th
Generation, abbreviation 4G) the advanced LTE network stable development of full IP.Mobile phone user's quantity in the whole world has been more than personal meter already
Calculation machine.A report that Ericsson company issues in June, 2014 claims, global mobile phone user's quantity by the end of 2013
, through breaking through 1,300,000,000, this number is estimated will to reach 5,600,000,000 in 2019 for oneself.The rapid proliferation of mobile phone, especially intelligent hand
The explosive growth of machine sales volume greatly have stimulated the increase of mobile network data service, including movies on demand, online trip
The contents such as play, mail, music, picture.The application of smart phone greatly changes daily life mode, more and more
People entertain and work using the multimedia of mobile phone and function of surfing the Net daily.In order to solve mobile data flow, a large amount of
In terminal, emerging service and the explosive growth of various new business scenes, the 5th generation (5th Generation, abbreviation 5G), are mobile
Communication network is suggested and becomes the hot topic of academia and industry.Under the estimated future 5G mobile communication system of scientist
It is theoretically even higher up to hundreds times of 4G system to carry speed, and commercial operation will be entered before and after the year two thousand twenty.Have no to doubt
It asks, people will continue HD video, audio, the demand of picture to keep rapid growth.With the rapid development of mobile Internet
With the continuous growth of internet of things service demand, 5G need to provide low cost, low-power consumption, consumption, safety and reliability performance.
Due to mobile communication skills such as the clear degree mobile phone screen of intelligent high definition, high-performance handset processes chip, mass storages
The research of art obtains rapid progress, and people are more frequent by the mobile terminals such as mobile phone viewing high definition picture, the behavior of video.Sea
The high-definition content of amount is transmitted in a network to be needed to occupy a large amount of bandwidth and can generate the redundancy for accounting for total flow significant proportion
Information.Nowadays, oneself warp of frequency resource becomes a kind of rare strategic resource, and wireless and wire channel is according to present usage mode
All it is difficult to meet the needs of future communications industry development.The method that tradition increases data communication Flux efficiency is mainly based upon single
The methods of the raising of channel spectrum capacity, the increase of frequency spectrum service efficiency and frequency division multiplexing.In practical application, these methods are all
Already close to respective theoretical limit, the means for continuing to improve these methods in future communications field are also extremely limited.Cause
This, in order to continue to increase substantially the channel transport efficiency of network, the storage of distributed cache device becomes one kind to be had very much
The information processing of prospect and Transfer Technology.As a result, under the premise of guaranteeing that service quality is constant, between Internet Service Provider
And its internal communication flows can all be greatly lowered, vacant channel out provides new transmission service.This information processing skill
Art is not only able to reduce network message redundancy degree, additionally it is possible to reach raising user's online experience by reducing Network access delay
Purpose.
The basic thought of D2D buffer memory technology is that cache storage is installed at different nodes in a communication network
Device, for storing the content that may be repeatedly clicked in network, when other users click the content, cache memory exists
The content of storage will be retrieved rapidly after receiving the information request command of user.If retrieved user request
Content, and after demonstrating the completeness and efficiency of the content, Cache then provides localized network transmission service at once, from
And it avoids user and sends information request command to far end I nternet server.Kind of an information processing manner is sent theoretically can either
The quantity of upload information request command is reduced, and can be greatly reduced in network channel, to be passed from core also backbone network
Defeated information content.
But the deployment request backhaul of super-intensive heterogeneous network (Heterogeneous Networks, abbreviation HetNets)
Link availability and volumetric properties, and may cost bottleneck.Essential idea is to small base station (Small Base
Station, abbreviation SBS) caching function is introduced, so as to then be asked by user locally in off-peak period prefetching content
It asks, to provide service in peak period.Here significant challenge be how to make content with the smallest download/access time at
This, while the requirement and requirement of user can also be met.At physical base station or mist edge or even in a user device in network
Cache contents are a kind of promising solutions on edge, for storing the popular content of base station user request, to access
Content rather than from its source file generate access it.
Summary of the invention
The purpose of the present invention is to provide a kind of big flows based on D2D (device-to-device, abbreviation D2D) caching
Communication information interaction processing method (Large-flow communication information interaction
Processing method based on D2D cache, LIDC), system when solving existing mobile subscriber big file download
Service is insufficient,
The purpose of the present invention is achieved through the following technical solutions:
A kind of big flow communication information interaction processing method based on D2D caching comprising the steps of:
Step 1: in mobile client, mobile subscriber issues interested big file requirement request information；
Step 2: at the end SBS, small base station obtains user demand and uploads in data cloud；
Step 3: MBS is based on user location, moving direction and user's history mobile message, and big file is split；
Step 4: the file after segmentation is encoded；
Step 5: sending cellular network base stations locating for helper mobile subscriber and user for the file after coding will be moved into
Base station；
Step 6: user is decoded information after receiving information, restores former interested big file.
Popularity based on information of interested big file requirement request information in the step 1 or based on user from
The demand of body.
It is the end SBS to user demand caching setting time T that small base station in the step 2, which obtains user demand, and will
The user demand arrangement cached in the period uploads in data cloud service.
Moving direction in the step 3 is calculated and is subject to using the gas dynamics model being situated between in sight traffic flow model
It improves；If mobility is characterized by stochastic variable (V, K) between Large-scale Mobile user, V indicates mobile subscriber's speed, there is two
A possible values is low speed vLWith high speed vH.It is quasi- that rate conversion, state transition rate 1/ are described with continuous time Markov chain
K.Think user velocity from vLOr vHBecome vHOr vLTime interval meet and be desired for the exponential distribution of K.User moving speed vu
Quasi-definite are as follows:
Wherein, ρmaxFor the permission maximum pedestrian density in the case of free flow；ρ is pedestrian density；ρjamFor congestion density；α,
β is model parameter.
The step 5 comprises the steps of: again
Step 5.1: in information exchanging process, intermediate forwarding nodes will cache information；
Step 5.2: the caching is limited by the life cycle set, and within life cycle, other users disappear to caching
It when breath has same requirements, directly obtains from the cache node, rather than is obtained from information source, save information acquisition times and net
The expense of network；Outside life cycle, the information of caching is buffered user and deletes, and prevents a large amount of cache information from occupying the node
Performance.
The beneficial effects of the present invention are:
Big flow communication information interaction processing method based on D2D caching of the invention, overcomes in existing computing technique
Deficiency in terms of data buffer storage ability and cost, SBS is organically integrated with mobile subscriber, by utilizing SBS and movement
User is split caching to big file, and takes full advantage of the relationship of the online and offline of mobile subscriber.It reduces slow
It is saved as this, the time required to obtaining file with target user, saves the network overhead of D2D communication.
Detailed description of the invention
Fig. 1 is LIDC information interactive processing method configuration diagram of the present invention；
Fig. 2 is the implementation steps of the invention；
Fig. 3 is that LIDC of the present invention only relies on SBS caching example；
Fig. 4 is LIDC of the present invention by SBS and mobile subscriber's caching example；
Fig. 5 is user online social property similarity of the present invention.
Specific embodiment
The present invention relates to it is a kind of based on D2D caching big flow communication information interaction processing method, including can to file into
The auxiliary node and social property supplementary module of row temporal cache；And it discloses one kind and makes full use of base station in Cellular Networks network
And model of the mobile subscriber as information cache helper, it include macro base station (Macro Base Station, abbreviation MBS), small
Type base station (SBS) and mobile subscriber's three parts；Provide detailed realization framework and Analysis on Key Technologies；In terms of architectural framework,
It has separately designed and has only relied on the framework model that SBS carries out content caching；And the D2D cache model that SBS is mixed with mobile subscriber.?
In information exchanging process, intermediate forwarding nodes will cache information.Solve system when existing mobile subscriber big file download
Service is insufficient.
The present invention is described further with reference to the accompanying drawing.
Embodiment 1:
To realize the big flow communication information interaction process cached based on D2D, D2D is based on present invention firstly provides a kind of
The big flow communication information interaction processing method framework of caching, as shown in Figure 1, a kind of big flow based on D2D caching communicates letter
Interaction processing method is ceased, wherein mobile content can be linked by D2D and is directly distributed to by excitation assistant (helper) on a small quantity
Target user.Using information centre's network and push caching to facility level, participates in this way, helper can become to neighbouring
Other mobile devices send the component part of the network of cache contents.It is different from other D2D Cache Frameworks, it is proposed that D2D
Frame allows operator to unload strategy, including delay-tolerant, Move Mode and content according to specific user environment flexible configuration
Feature.Traditional boundary between the case where this flexibility has broken tolerance delay-tolerant and do not tolerated delay, because of network rack
Structure can handle them in a uniform manner, and have flexible configurability when unloading content flow.
(a) the helper selection strategy based on the analysis of user's Move Mode.
The efficiency of the content distribution based on D2D to opportunistic is generated significant impact by the selection of helper.This needs root
Necessary human behavior study and analysis are carried out according to history mobile data.Fortunately, the daily behavior of most of mobile subscribers
Mode be regularly/it is predictable, and tend to repeat pattern, including mobility and application/content use.Based on this
The knowledge of sample, it is proposed that offline helper selection algorithm, for sending information to optimal one group of helper.
(b) coordinate between the SBS cached based on the helper across cell boarder.
On the one hand, each SBS keeps it about the local file of the content availability of helper, near being effectively
Interested offering customers service.On the other hand, in fact, helper equipment can go to multiple positions that different SBS are covered
It sets.In order to maximize the geographical service coverage area of helper, it may be necessary to necessary coordination is carried out between SBS, so as to
Make it about the content synchronization of mobile helper caching.
(c) Context resolution
In the information in heart network (information center network, abbreviation ICN), each content is by name
System and content designator unique identification.Each ICN framework has the agreement of the mark content of oneself, this hair according to its naming system
It is bright not recommend any specific naming method, but frame of the invention keeps general, so it is adapted to any ICN frame
Structure.The related SBS of user Xiang Qi in overlay area issues interest grouping to be used for Context resolution.Each SBS safeguards oneself
Context resolution table (content resolution table, abbreviation CRT).SBS just obtains by searching for the CRT of its local maintenance
Obtain contents parser role.If content is currently carried by the helper in the D2D communication range of requestor, SBS will be simple
Ground forwards a request to the target helper near the client.Helper needs to know that the device id of client could establish D2D
Communication link.After successfully completing this verification process, the D2D that helper establishes safety with client, which is linked, to carry out data transmission.
As shown in Fig. 2, a kind of big flow communication information interaction processing method based on D2D caching of the invention, comprising the following steps:
Step 1, in mobile client, mobile subscriber issues interested big file requirement request information；
Step 2, at the end SBS, small base station obtains user demand and simultaneously uploads in data cloud；
Step 3, MBS are based on user location, moving direction and user's history mobile message, and big file is split；
Step 4 encodes the file after segmentation；
The file after coding is sent the base station that cellular network base stations and user locating for mobile subscriber will be moved by step 5；
Step 6, user are decoded information after receiving information, restore former interested big file.
Due to the caching to information, step 5 includes: again
Step 5.1, in information exchanging process, intermediate forwarding nodes will cache information.
Step 5.2, the caching are limited by the life cycle set, and within life cycle, other users disappear to caching
Breath is then directly obtained from the cache node when having same requirements, rather than is obtained from information source, save information acquisition times and
The expense of network；Outside life cycle, the information of caching is buffered user and deletes, and prevents a large amount of cache information from occupying the node
Performance.
In step 1, the interest demand to big file is randomly generated in mobile subscriber, which can be based on the prevalence of information
Degree, can also be based on the demand of user itself.
Corresponding above-mentioned steps 2 are that the end SBS caches setting time T, and the user that will be cached in the period to user demand
Demand arrangement uploads in data cloud service.
Corresponding above-mentioned steps 3 are that MBS is based on user location, moving direction and user's history mobile message, by big file into
Row segmentation.
Consider that complicated movement environmental phenomenon and user generate time delay to calculating accuracy influence in advancing.To realize this mesh
Mark, proposed adoption Jie see the gas dynamics model in traffic flow model and are improved.Traffic flow theory model is greatly classified into
The microcosmic, sight that is situated between, macroscopical three classes descriptive model.Gas dynamics model is able to satisfy large-scale consumer real-time mobility requirement, more connects
The complex network scene closely proposed, the relevant parameter that designs a model are as follows: setting mobility between Large-scale Mobile user and pass through at random
Variable (V, K) characterizes, and V indicates mobile subscriber's speed, is low speed v there are two possible valuesLWith high speed vH.It is quasi- to use continuous time
Markov chain describes rate conversion, state transition rate 1/K.Think user velocity from vL(or vH) become vH(or vL)
Time interval meets the exponential distribution for being desired for K.User moving speed vuQuasi-definite are as follows:
Wherein, ρmaxFor the permission maximum pedestrian density in the case of free flow；ρ is pedestrian density；ρjamFor congestion density；α,
β is model parameter.
In order to support proposed LIDC information interactive processing method, the present invention considers two kinds of situations: (1) in the region SBS
Most of helper be in given position more new state；(2) most of helper are mobile, they tend to from one
The region SBS is moved to another.In the first scenario, when a user sends file demand, the solution of the present invention tendency
In finding those helpers opposing stationary in the region.For the environment in dining room, such case may be it is ideal,
In this environment, the mobility of waiter is lower, and the customer for accessing dining room is mobile more in the areas adjacent.In second of feelings
Under condition, online attribute of the present invention according to user, such as Facebook, microblogging etc. determines the social property of user, for example
The types such as good friend, bean vermicelli, the people of such type often have common point of interest；Returned based on the label on such as microblogging
The label of class, each user is not necessarily identical, everyone label can have different weights, and combine user's
The suitable helper of offline Attributions selection carries out content caching, and selected helper may be in different from active user
SBS coverage area in.
In the first scenario, the present invention devises the cache mode for being based only upon SBS, i.e., SBS is as helper.Such as Fig. 3
It is shown, user U in figure1The downloading of upper transmitting file b is requested, SBS1Can retrieve local cache whether to this document or its subfile into
Cache contents if having cached, are sent to user U by row caching1；If not caching to this document, demand is uploaded into cloud
Server is held, file destination is split according to mobile subscriber position, moving direction and the user's history mobility, is sent out
It is sent to the SBS that mobile subscriber passes through on the way1With SBS3In, work as t moment, user U1It is moved to U1' when receive SBS3The file of transmission,
And the file received is decoded, obtain file destination.
In the latter case, the present invention devises the cache mode based on SBS and mobile subscriber, i.e. SBS and mobile use
Family all can be used as helper.As shown in figure 4, user U in figure1The downloading of upper transmitting file b is requested, SBS1Local cache can be retrieved
And whether the mobile subscriber in region caches this document or its subfile, if having cached, cache contents are sent to
User U1；If not caching to this document, demand is uploaded into cloud server, by calculating user U1Position and surrounding
The online phase recency of user, user motion track select the suitable equipment to carry out as helper the caching of information.With
Family U1The file received is decoded after receiving file, to obtain file destination.
The similarity of two users is quantified by taking Fig. 5 as an example.In figure the label of two users there are three be it is identical, i.e.,
video,fun,soccer.Each label has respective weighted value, can quantify the phase recency w of two users outij=0.2 ×
0.4+0.1 × 0.3+0.05 × 0.1=0.115.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of big flow communication information interaction processing method based on D2D caching, which is characterized in that comprise the steps of:
Step 1: in mobile client, mobile subscriber issues interested big file requirement request information；
Step 2: at the end SBS, small base station obtains user demand and uploads in data cloud；
Step 3: MBS is based on user location, moving direction and user's history mobile message, and big file is split；
Step 4: the file after segmentation is encoded；
Step 5: by the base that the file after coding is sent to cellular network base stations locating for helper mobile subscriber and user will be moved into
It stands；
Step 6: user is decoded information after receiving information, restores former interested big file.
2. a kind of big flow communication information interaction processing method based on D2D caching according to claim 1, feature exist
Interested big popularity of the file requirement request information based on information in the step 1 or the need based on user itself
It asks.
3. a kind of big flow communication information interaction processing method based on D2D caching according to claim 1, feature exist
Small base station in the step 2, which obtains user, to cache setting time T to user demand for the end SBS, and by the period
The user demand arrangement of interior caching uploads in data cloud service.
4. a kind of big flow communication information interaction processing method based on D2D caching according to claim 1, feature exist
Moving direction in the step 3 is calculated and is improved using the gas dynamics model being situated between in sight traffic flow model；If
Mobility is characterized by stochastic variable (V, K) between Large-scale Mobile user, and V indicates mobile subscriber's speed, and there are two may
Value be low speed vLWith high speed vH；It is quasi- that rate conversion, state transition rate 1/K are described with continuous time Markov chain；Think
User velocity is from vL(or vH) become vH(or vL) time interval meet and be desired for the exponential distribution of K；User moving speed vuIt is quasi-
Is defined as:
Wherein, ρmaxFor the permission maximum pedestrian density in the case of free flow；ρ is pedestrian density；ρjamFor congestion density；α, β are
Model parameter.
5. a kind of big flow communication information interaction processing method based on D2D caching according to claim 1, feature exist
It is comprised the steps of: again in the step 5
Step 5.1: in information exchanging process, intermediate forwarding nodes will cache information；
Step 5.2: the caching is limited by the life cycle set, and within life cycle, other users have in the message to caching
It when same requirements, directly obtains from the cache node, rather than is obtained from information source, save information acquisition times and network
Expense；Outside life cycle, the information of caching is buffered user and deletes, and prevents a large amount of cache information from occupying the property of the node
Energy.
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