CN106550039B - A kind of cross-layer cooperation content buffering method and system based on SD RAN - Google Patents
A kind of cross-layer cooperation content buffering method and system based on SD RAN Download PDFInfo
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- CN106550039B CN106550039B CN201610981738.XA CN201610981738A CN106550039B CN 106550039 B CN106550039 B CN 106550039B CN 201610981738 A CN201610981738 A CN 201610981738A CN 106550039 B CN106550039 B CN 106550039B
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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
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
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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
- H04L67/568—Storing data temporarily at an intermediate stage, e.g. caching
- H04L67/5682—Policies or rules for updating, deleting or replacing the stored data
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Abstract
The invention discloses a kind of cross-layer cooperation content caching system based on SD RAN, belong to wireless communication technology field.The system is made up of the small cell base station of several non-overlapping copies provided in the macrocell base stations and its coverage that control covering and seamless connection, macrocell base stations and small cell base station provide data, services function jointly, system by by popularity highest content caching in cellulor cache node, secondary popular content caching is in macrocellular cache node, user can be reduced and transfer the overhead that identical content is brought from remote content server repeatedly, The invention also achieves a kind of cross-layer cooperation content buffering method based on SD RAN；The present invention makes full use of the advantage that software defined network and cross-layer cooperation are cached, by optimizing the content storage space distribution coefficient of macrocell base stations and small cell base station, and the average content that can significantly reduce system obtains expense.
Description
Technical field
The invention belongs to wireless communication technology field, more particularly, to one kind, based on SD-RAN, (software definition wirelessly connects
Network) cross-layer cooperation content caching system.
Background technology
Caching is generally the higher content of popularity to be stored near user in a kind of content memory technology, radio communication
Cache node in (such as base station), called repeatedly from remote content server to reduce, the probability of identical content transmitted, so as to have
Effect reduces transport overhead, alleviates the transmission bottleneck of backhaul network, realizes green communications.
Cisco's visual web index " pointed out in Globle mobile data traffic forecast update ",
Video service and content occupy leading status in moving communicating field relative to other classs of business.2015, using video as
Main content of multimedia contribute to about 69% mobile service load.To the year two thousand twenty, this ratio will rise to 79%.Study table
It is bright,
I.e. the high content of small part popularity can repeatedly be downloaded by user, watched.By taking Youtube as an example, popularity row
The video file of name preceding 10% contribute to about 80% business load.In addition, the popularity change of these video contents is delayed relatively
Slowly, for example, the news comprising video clip generally updated once per 2-3 hours, the film newly reached the standard grade typically updates weekly one
It is secondary.Therefore, from the point of view of the time dimension that wireless access network content caching and information are delivered, these video contents obey relative quiescent
Popularity distribution.In this context, in the way of caching technology to store as a kind of " exchanging bandwidth for ", it is obtained extensive
Research.
At present, the research of caching technology predominantly stays in individual layer caching system, i.e., each small cell base station is in macrocellular base
The information that the control stood carries out asking with layer cooperation caching and to user under coordinating to content is responded, but individual layer is cached
There is spatial cache solidification in system, overhead optimizes the defect such as unobvious.
The content of the invention
For the disadvantages described above or Improvement requirement of prior art, the invention provides a kind of cross-layer cooperation based on SD-RAN
Content caching system, its object is to be provided with cache node in macrocell base stations and small cell base station respectively, by grand honeybee
The content of nest base station and the different popularities of cellulor storage, to reach the purpose for improving buffer efficiency.In addition, the system is also
The function of software defined network is taken full advantage of, according to the user monitored from local small cell base station, macrocell base stations and remote
Content server is held to obtain the size of the expense of content, in real time distribution cellulor and macrocell base stations spatial cache, it is further real
The optimization of existing SD-RAN content obtaining expenses, thus solves the solidification of individual layer caching system spatial cache, and overhead optimization is not clear
The defect such as aobvious.
To achieve the above object, the invention provides a kind of cross-layer cooperation content caching system based on SD-RAN, this is
Unite by realizing that the cellulor of several non-overlapping copies in the macrocellular and its coverage that control covering and seamless connection is constituted,
Under SD-RAN control, the system can realize that numerical control is separated, and the system includes key-course and data Layer：
The data Layer includes two sublayers：
Small cell base station cache node sublayer, for storing one group of content of popularity highest, performs cache contents initial
Change or update, reduction user asks the overhead that identical content is brought from distal end repeatedly；
Macrocell base stations cache node sublayer, the one group content high for storing popularity time, performs cache contents initial
Change or update, expand the content storage total amount of global network, lift global buffer efficiency；
The key-course includes two modules：Content delivery module, for judging whether user's request content has in caching
Hold in data Layer and which sublayer in data Layer, and notify specific sublayer to deliver content；
Buffer update module, starts when user's request content is not in data Layer spatial cache, for each to data Layer
The cache contents of sublayer spatial cache are updated.
Further, the popularity of the content is defined as：
If content library is by M Composition of contents, the frequency descending being requested by a user by it is arranged as { x1,…,xm,…,xM,
Then the requested popularity of m-th of content can be expressed as
Wherein, α is Zipf profile exponents；It characterizes the inclined degree of request model：α is bigger, and user's request is more concentrated
The larger content of probability；α is smaller, and user's request is more scattered.Present invention assumes that user is to content x in n-th of cellulormRequest
Probability beBecause the user distribution of each cellulor and user are identicals to the request probability of same content, therefore deposit
Wherein, N is the sum of small cell base station under global network.
Further, the key-course also includes spatial cache distribute module, for distributing each sublayer spatial cache, specifically
For：
Global total spatial cache is denoted as S, it is assumed that storage size shared by each content is 1, therefore global buffer is empty
Between can at most store S content.A memory allocation coefficient τ (0≤τ≤1) is defined, then macrocell base stations cache node
The spatial cache S of layermWith the spatial cache S of each small cell base station cache node sublayersSize be
Sm=τ S
The scene that the present invention considers is, the request probability of the user distribution of each small cell base station and user to same content
It is identical, therefore the storage content of each small cell base station cache node sublayer is identical.To realize that global average content is obtained
Take away the optimization of pin, the system is by popularity highest SsSmall cell base station cache node sublayer is arrived in individual content storage, by secondary stream
Capable SmMacrocell base stations cache node sublayer is arrived in individual content storage.By user's institute's request content in small cell base station cache node
The hit rate of sublayer and macrocell base stations cache node sublayer is denoted as h respectivelyl、hm, by user in SD-RAN miss rate, that is, use
Family obtains the probability of request content from remote content server, is denoted as hr.Then have
hr=1-hl-hm.
User is taken from local small cell base station cache node sublayer, macrocell base stations cache node sublayer and remote content
The average overhead that business device obtains single content is denoted as c respectivelyl、cm、cr, without loss of generality, there is cl＜ cm＜ cr.Therefore, system list
Individual content average acquiring expense Cost object function can be expressed as
Derivation is carried out to above-mentioned formula, it is zero to make derived function, can be obtained
Due to 0≤τ≤1, therefore optimal spatial cache distribution coefficient τ*For
According to obtained optimal spatial cache distribution coefficient τ*, the spatial cache S of macrocell base stations cache node sublayermWith
The spatial cache S of each small cell base station cache node sublayersOptimal distributing scheme be
Sm=τ*S
When spatial cache distribution coefficient is optimal, it is minimum that system obtains single content expense.
Further, the content delivery module includes following submodule：
Request receiving submodule, the content requests for receiving user from small cell base station；
Caching delivers submodule, for inquiring about whether small cell base station cache node sublayer has cached request content, if slow
The request content has been deposited, then has responded user's request and notifies small cell base station and carry out content delivery；Otherwise, macrocell base stations are inquired about
Whether cache node sublayer has cached the request content, if having cached the request content, and response user's request notifies macrocellular
Base station simultaneously carries out content delivery；Otherwise, long-range delivery module is enabled；
It is long-range to deliver submodule, submit user content to ask to remote content server, notify remote content server to enter
Row content delivery.
Further, start the buffer update module when user's request content is not in data Layer spatial cache, delay
Deposit update module and specifically include following submodule：
First updates submodule, and the hollow content popularit of small cell base station cache node sublayer spatial cache is set into 0；Again
Compare the minimum content x of popularity in small cell base station cache node sublayeraPopularity PsminWith request content x0Popularity
P0Between size, if P0＞ Psmin, then by the minimum content x of the popularity of macrocell base stations cache node sublayerbIn being substituted for
Hold xa, by the content x of small cell base station cache node sublayeraContent is substituted for for x0；Otherwise the second renewal submodule is enabled；
Second updates submodule, and the hollow content popularit of macrocell base stations cache node sublayer spatial cache is set into 0；Again
Compare the minimum content x of popularity in macrocell base stations cache node sublayerbPopularity PmminWith request content x0Popularity
P0Between size, if P0＞ Pmmin, then by the content x of macrocell base stations cache node sublayerbContent is substituted for for x0；Otherwise not
Process.
Further, the key-course also includes monitoring modular, for the buffer status of each sublayer of Monitoring Data layer, respectively
Individual base station and the expense of remote content server response contents.
On the other hand, to achieve the above object, the invention provides a kind of cross-layer cooperation content caching based on SD-RAN
Method, it is characterised in that set a cache node sublayer respectively in small cell base station and macrocell base stations, small cell base station is delayed
Depositing node sublayer is used to store one group of content of popularity highest, and macrocell base stations cache node sublayer is used to store popularity
One group of high content, this method is specifically divided into following steps：
Content delivery step：Judge whether user's request content there are cache contents in cache node sublayer, and notify tool
Body cache node sublayer delivers content；If user's request content is not in each cache node sublayer, remote content service is notified
Device carries out content delivery；
Buffer update step：If user's request content is not in each cache node sublayer, compare user's request content and
The popularity of each cache node sublayer cache contents, if each cache node sublayer cache contents popularity is less than request content prevalence
Degree, then be updated to the cache contents in the spatial cache of each cache node sublayer.
Further, it is characterised in that the popularity of the content is defined as：
If content library is by M Composition of contents, the frequency descending being requested by a user by it is arranged as { x1,…,xm,…,xM,
Then the requested popularity of m-th of content can be expressed as
Wherein, α is Zipf profile exponents；It characterizes the inclined degree of request model：α is bigger, and user's request is more concentrated
The larger content of probability；α is smaller, and user's request is more scattered.；
User is to content x in n-th of small cell base stationmThe popularity of request isFor
Wherein, N is the sum of small cell base station under global network.
Further, it is characterised in that the small cell base station cache node sublayer and macrocell base stations cache node
The spatial cache of layer is distributed as follows：
The spatial cache of macrocell base stations cache node sublayer is designated as Sm, each small cell base station cache node sublayer it is slow
Deposit space and be designated as Ss, optimal distributing scheme is：
Sm=τ*S
Wherein, S is global total spatial cache；τ*For optimal spatial cache distribution coefficient
Wherein, clTo cache the average overhead for obtaining single content from small cell base station；cmTo be obtained from macrocell base stations caching
Take the average overhead of single content；crTo obtain the average overhead of single content from remote content server, when spatial cache point
When distribution coefficient is optimal, the single content average acquiring expense of system is minimum.
Further, the content delivery step is specifically divided into following sub-step：
Request receives sub-step：The content requests of user are received from small cell base station；
Caching delivers sub-step：Whether inquiry small cell base station cache node sublayer has cached request content, if caching
The request content, then respond user's request and notify small cell base station and carry out content delivery；Otherwise, inquiry macrocell base stations caching
Whether node sublayer has cached the request content, if having cached the request content, and response user's request notifies macrocell base stations
And carry out content delivery；Otherwise, long-range delivery steps are enabled；
It is long-range to deliver sub-step：Submit user content to ask to remote content server, notify remote content server to enter
Row content delivery.
Further, buffer update, institute are carried out when user's request content is not in each cache node sublayer spatial cache
State buffer update step and be specifically divided into following sub-step：
First updates sub-step, and the hollow content popularit of small cell base station cache node sublayer spatial cache is set into 0；Again
Compare the minimum content x of popularity in small cell base station cache node sublayeraPopularity PsminWith request content x0Popularity
P0Between size, if P0＞ Psmin, then by the minimum content x of the popularity of macrocell base stations cache node sublayerbIn being substituted for
Hold xa, by the content x of small cell base station cache node sublayeraContent is substituted for for x0；Otherwise the second renewal sub-step is enabled；
Second updates sub-step, and the hollow content popularit of macrocell base stations cache node sublayer spatial cache is set into 0；Again
Compare the minimum content x of popularity in macrocell base stations cache node sublayerbPopularity PmminWith request content x0Popularity
P0Between size, if P0＞ Pmmin, then by the content x of macrocell base stations cache node sublayerbContent is substituted for for x0；Otherwise not
Process.
Further, the key-course also includes monitoring step, the buffer status of each sublayer of Monitoring Data layer, each base
Stand and remote content server response contents expense.
In general, by the contemplated above technical scheme of the present invention compared with prior art, it is special with following technology
Levy and beneficial effect：
(1) the cross-layer cooperation content caching system proposed by the present invention based on SD-RAN realizes macrocell base stations and chalcid fly
The cooperation caching of nest base station, system by by secondary popular content caching in macrocellular cache node, it is to avoid from remote content
Server transfers the expense that higher popularity content is brought repeatedly,
(2) further, the present invention makes full use of SD-RAN advantage, and user is obtained from local cellulor base according to monitoring
Stand, macrocell base stations and remote content server obtain the expense of content, cellulor and macrocellular cache node are divided in real time
Spatial cache size, optimizes spatial cache structure, improves the buffer efficiency of system, reduce further the present invention average interior
Hold and obtain expense.In addition, there is no excessive computation complexity in system design, it is easy to manipulate and implements.
Brief description of the drawings
Fig. 1 is present system structural representation；
Fig. 2 be present system in the timing of space distribution coefficient τ mono-, average content obtains expense with Link State factor gamma
Between relation；
Fig. 3 is the data Layer cache contents distribution schematic diagram of present system；
Fig. 4 is the content request responses schematic flow sheet of present system；
Initialization and update method of the Fig. 5 for the cache contents of present system.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with accompanying drawing and emulation example
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.As long as in addition, technical characteristic involved in each embodiment of invention described below
Not constituting conflict each other can just be mutually combined.
As shown in figure 1, present system includes key-course and data Layer：
In order to avoid transferring the high expense that higher popularity content is brought, the data repeatedly from remote content server
Layer includes two sublayers：
Small cell base station cache node sublayer, for storing one group of content of popularity highest, performs cache contents initial
Change or update, reduction user asks the overhead that identical content is brought from distal end repeatedly；
Macrocell base stations cache node sublayer, the one group content high for storing popularity time, performs cache contents initial
Change or update, expand the content storage total amount of global network, lift global buffer efficiency；
The key-course includes two modules：Content delivery module, for judging whether user's request content has in caching
Hold in data Layer and which sublayer in data Layer, and notify specific sublayer to deliver content；
Buffer update module, starts when user's request content is not in data Layer spatial cache, for each to data Layer
The cache contents of sublayer spatial cache are updated.The popularity of the content is defined as：
If content library is by M Composition of contents, the frequency descending being requested by a user by it is arranged as { x1,…,xm,…,xM,
Then the requested popularity of m-th of content can be expressed as
Wherein, α is Zipf profile exponents；
User is to content x in n-th of small cell base stationmThe popularity of request isFor
Wherein, N is the sum of small cell base station under global network.
The key-course also includes spatial cache distribute module, for distributing each sublayer spatial cache, is specially：
The spatial cache of macrocell base stations cache node sublayer is designated as Sm, each small cell base station cache node sublayer it is slow
Deposit space and be designated as Ss, optimal distributing scheme is：
Sm=τ*S
Wherein, S is global total spatial cache；τ*For optimal spatial cache distribution coefficient
Wherein, clTo obtain the average overhead of single content from small cell base station cache node；cmTo delay from macrocell base stations
Deposit the average overhead that node obtains single content；crTo obtain the average overhead of single content from remote content server, when slow
Deposit space distribution coefficient for it is optimal when, the single content average acquiring expense of system is minimum.
Emulation embodiment：
Simulation parameter sets as follows：General act content is 5000, and the total spatial cache of system is 2000, Zipf profile exponents α
For 0.7, cellulor sum is 2.Above the present invention is it has been mentioned that cl、cm、crRepresent user from cellulor (local), grand honeybee respectively
Nest and distal end obtain content obtaining expense, and assume cl＜ cm＜ cr.For the ease of research, the present invention makes cl=1, cr=10, cm
=γ cr, wherein 0.1 ＜ γ ＜ 1.
As shown in Fig. 2 when the spatial cache of two sublayers is not reaching to optimum allocation coefficient, system is distributed for any space
Number τ, average content obtains expense and all increased with the increase of Link State factor gamma.For any Link State factor gamma,
The corresponding space distribution coefficient τ of minimum average B configuration content obtaining expense is different.Therefore, the content caching system based on SD-RAN
System is particularly important, and system can be by real-time link state, the space distribution coefficient dynamically optimized, so as to realize average
Content obtaining minimizing overhead.From figure 2 it may also be seen that the algorithm of the present invention can be tried to achieve under arbitrary Link State
Optimal space distribution coefficient τ*, so that the average content substantially reduced obtains expense.
Distribute after each sublayer spatial cache, expense is obtained in order to reduce average content, it is of the invention by popularity highest x1
~xmContent be stored in the spatial cache of each small cell base station cache node sublayer, by the high x of popularity timem+1~xm+nIn individual
Hold the spatial cache of deposit macrocell base stations cache node sublayer, wherein, n=Sm=τ*S；Such as Fig. 3 institutes
Show, cached by above-mentioned cross-layer, system cache structure can be optimized, buffer efficiency is improved, so as to reduce average content acquisition
Expense.
As shown in figure 4, the content delivery module includes following submodule：
Request receiving submodule, the content requests for receiving user from small cell base station；
Caching delivers submodule, for inquiring about whether small cell base station cache node sublayer has cached request content, if slow
The request content has been deposited, then has responded user's request and notifies small cell base station and carry out content delivery；Otherwise, macrocell base stations are inquired about
Whether cache node sublayer has cached the request content, if having cached the request content, and response user's request notifies macrocellular
Base station simultaneously carries out content delivery；Otherwise, long-range delivery submodule is enabled；
It is long-range to deliver submodule, submit user content to ask to remote content server, notify remote content server to enter
Row content delivery.
As shown in figure 5, starting the buffer update module when user's request content is not in data Layer spatial cache, delay
Deposit update module and specifically include following submodule：
First updates submodule, and the hollow content popularit of small cell base station cache node sublayer spatial cache is set into 0；Again
Compare the minimum content x of popularity in small cell base station cache node sublayeraPopularity PsminWith request content x0Popularity
P0Between size, if P0＞ Psmin, then by the minimum content x of the popularity of macrocell base stations cache node sublayerbIn being substituted for
Hold xa, by the content x of small cell base station cache node sublayeraContent is substituted for for x0；Otherwise the second renewal submodule is enabled；
Second updates submodule, and the hollow content popularit of macrocell base stations cache node sublayer spatial cache is set into 0；Again
Compare the minimum content x of popularity in macrocell base stations cache node sublayerbPopularity PmminWith request content x0Popularity
P0Between size, if P0＞ Pmmin, then by the content x of macrocell base stations cache node sublayerbContent is substituted for for x0；Otherwise not
Process.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
Any modifications, equivalent substitutions and improvements made within refreshing and principle etc., should be included in the scope of the protection.
Claims (8)
1. a kind of cross-layer cooperation content caching system, it is characterised in that the system includes being key-course and data Layer：
The data Layer includes two sublayers：Small cell base station cache node sublayer, for storing in one group of popularity highest
Hold；Macrocell base stations cache node sublayer, the one group content high for storing popularity time；
The key-course includes：Content delivery module, for judging whether user's request content is stored in data Layer and in number
According to which sublayer of layer, and specific sublayer is notified to deliver content；Buffer update module, when user's request content is slow not in data Layer
Start when depositing in space, be updated for the cache contents to each sublayer spatial cache of data Layer；
The key-course also includes spatial cache distribute module, for distributing each sublayer spatial cache, is specially：
The spatial cache of macrocell base stations cache node sublayer is designated as Sm, the caching sky of each small cell base station cache node sublayer
Between be designated as Ss, optimal distributing scheme is：
Sm=τ*S
Wherein, S is global total spatial cache；τ*For optimal spatial cache distribution coefficient, N is small cell base station under global network
Sum,
Wherein, clTo obtain the average overhead of single content from small cell base station cache node；cmSaved to be cached from macrocell base stations
Point obtains the average overhead of single content；crTo obtain the average overhead of single content from remote content server, α is Zipf points
Cloth index；When spatial cache distribution coefficient is optimal, the single content average acquiring expense of system is minimum.
2. a kind of cross-layer cooperation content caching system according to claim 1, it is characterised in that the popularity of the content
It is defined as：
If content library is by M Composition of contents, the frequency descending being requested by a user by it is arranged as { x1,…,xm,…,xM, then m
The individual requested popularity of content can be expressed as
User is to content x in n-th of small cell base stationmThe popularity of request isFor
3. a kind of cross-layer cooperation content caching system according to claim 1, it is characterised in that the content delivery module
Including following submodule：
Request receiving submodule, the content requests for receiving user from small cell base station；
Caching delivers submodule, for inquiring about whether small cell base station cache node sublayer has cached request content, if caching
The request content, then respond user's request and notify small cell base station and carry out content delivery；Otherwise, inquiry macrocell base stations caching
Whether node sublayer has cached the request content, if having cached the request content, and response user's request notifies macrocell base stations
And carry out content delivery；Otherwise, long-range delivery submodule is enabled；
It is long-range to deliver submodule, submit user content to ask to remote content server, notify in the progress of remote content server
Hold and deliver.
4. a kind of cross-layer cooperation content caching system according to claim 1, it is characterised in that when user's request content not
Start the buffer update module when in data Layer spatial cache, buffer update module specifically includes following submodule：
First updates submodule, and the hollow content popularit of small cell base station cache node sublayer spatial cache is set into 0；Compare again
The minimum content x of popularity in small cell base station cache node sublayeraPopularity PsminWith request content x0Popularity P0It
Between size, if P0＞ Psmin, then by the minimum content x of the popularity of macrocell base stations cache node sublayerbIt is substituted for content
xa, by the content x of small cell base station cache node sublayeraContent is substituted for for x0；Otherwise the second renewal submodule is enabled；
Second updates submodule, and the hollow content popularit of macrocell base stations cache node sublayer spatial cache is set into 0；Compare again
The minimum content x of popularity in macrocell base stations cache node sublayerbPopularity PmminWith request content x0Popularity P0It
Between size, if P0＞ Pmmin, then by the content x of macrocell base stations cache node sublayerbContent is substituted for for x0；Otherwise do not do
Processing.
5. a kind of cross-layer cooperation content buffering method, it is characterised in that set one respectively in small cell base station and macrocell base stations
Individual cache node sublayer, small cell base station cache node sublayer is used to store one group of content of popularity highest, macrocell base stations
Cache node sublayer is used to store one group of high content of popularity time, and this method is specifically divided into following steps：
Content delivery step：Judge whether user's request content there are cache contents in cache node sublayer, and notify specific slow
Deposit node sublayer and deliver content；If user's request content is not in each cache node sublayer, remote content server is notified to enter
Row content delivery；
Buffer update step：If user's request content is not stored in each cache node sublayer, compare user's request content
With the popularity of each cache node sublayer cache contents, if each cache node sublayer cache contents popularity be less than request content stream
Row degree, then be updated to the cache contents in the spatial cache of each cache node sublayer；
Cache node sublayer space allocation step：The small cell base station cache node sublayer and macrocell base stations cache node
The spatial cache of layer is distributed as follows：
The spatial cache of macrocell base stations cache node sublayer is designated as Sm, the caching sky of each small cell base station cache node sublayer
Between be designated as Ss, optimal distributing scheme is：
Sm=τ*S
Wherein, S is global total spatial cache；τ*For optimal spatial cache distribution coefficient, N is small cell base station under global network
Sum,
Wherein, clTo obtain the average overhead of single content from small cell base station cache node；cmSaved to be cached from macrocell base stations
Point obtains the average overhead of single content；crTo obtain the average overhead of single content from remote content server, α is Zipf points
Cloth index；When spatial cache distribution coefficient is optimal, the single content average acquiring expense of system is minimum.
6. a kind of cross-layer cooperation content buffering method according to claim 5, it is characterised in that the popularity of the content
It is defined as：
If content library is by M Composition of contents, the frequency descending being requested by a user by it is arranged as { x1,…,xm,…,xM, then m
The individual requested popularity of content can be expressed as
User is to content x in n-th of small cell base stationmThe popularity of request isFor
7. a kind of cross-layer cooperation content buffering method according to claim 5, it is characterised in that the content delivery step
It is specifically divided into following sub-step：
Request receives sub-step：The content requests of user are received from small cell base station；
Caching delivers sub-step：Whether inquiry small cell base station cache node sublayer has cached request content, please if having cached this
Content is sought, then responds user's request and notifies small cell base station and carry out content delivery；Otherwise, macrocell base stations cache node is inquired about
Whether sublayer has cached the request content, if having cached the request content, and response user's request notifies macrocell base stations to go forward side by side
Row content delivery；Otherwise, long-range delivery steps are enabled；
It is long-range to deliver sub-step：Submit user content to ask to remote content server, notify remote content server is carried out interior
Hold and deliver.
8. a kind of cross-layer cooperation content buffering method according to claim 5, it is characterised in that when user's request content not
Buffer update is carried out when in each cache node sublayer spatial cache, the buffer update step is specifically divided into following sub-step：
First updates sub-step, and the hollow content popularit of small cell base station cache node sublayer spatial cache is set into 0；Compare again
The minimum content x of popularity in small cell base station cache node sublayeraPopularity PsminWith request content x0Popularity P0It
Between size, if P0＞ Psmin, then by the minimum content x of the popularity of macrocell base stations cache node sublayerbIt is substituted for content
xa, by the content x of small cell base station cache node sublayeraContent is substituted for for x0；Otherwise the second renewal sub-step is enabled；
Second updates sub-step, and the hollow content popularit of macrocell base stations cache node sublayer spatial cache is set into 0；Compare again
The minimum content x of popularity in macrocell base stations cache node sublayerbPopularity PmminWith request content x0Popularity P0It
Between size, if P0＞ Pmmin, then by the content x of macrocell base stations cache node sublayerbContent is substituted for for x0；Otherwise do not do
Processing.
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| CN108521640B (en) * | 2018-02-27 | 2020-05-01 | 北京邮电大学 | Content distribution method in cellular network |
| CN108549719A (en) * | 2018-04-23 | 2018-09-18 | 西安交通大学 | A kind of adaptive cache method based on cluster in mobile edge calculations network |
| CN110083761B (en) * | 2018-10-18 | 2023-06-20 | 中国电子科技集团公司电子科学研究院 | Data distribution method, system and storage medium based on content popularity |
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