CN110505666A - Content buffering method and beehive network system in a kind of cellular network - Google Patents

Content buffering method and beehive network system in a kind of cellular network Download PDF

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Publication number
CN110505666A
CN110505666A CN201910750358.9A CN201910750358A CN110505666A CN 110505666 A CN110505666 A CN 110505666A CN 201910750358 A CN201910750358 A CN 201910750358A CN 110505666 A CN110505666 A CN 110505666A
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base station
current
content
indicate
cell
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CN110505666B (en
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许晓东
高宁
侯延昭
陶小峰
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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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
    • H04L67/5681—Pre-fetching or pre-delivering data based on network characteristics
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
    • H04W36/0085—Hand-off measurements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/08—Reselecting an access point
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/16—Performing reselection for specific purposes
    • H04W36/18—Performing reselection for specific purposes for allowing seamless reselection, e.g. soft reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H04W36/30—Reselection being triggered by specific parameters by measured or perceived connection quality data

Abstract

The embodiment of the invention provides the content buffering methods and caching system in a kind of cellular network, and wherein method includes: that user terminal calculates cell transfer generally and sends it to adjacent base station；The downloading that adjacent base station calculates user terminal does not complete probability；Current base station determines current area content popularit；Current base station is based on the received cell transition probability sent by adjacent base station and downloads unfinished probability, is modified to current area content popularit；MEC is determined optimal caching arrangement matrix and is sent it to current base station based on the received revised cell content popularit list sent by current base station；Current base station is based on optimal caching and arranges matrix, is cached to target downloading content and sends it to user terminal；The present invention can be avoided caching and interrupt, and then avoid the problem that obtaining data from core net due to caching interruption causes propagation delay time to increase.

Description

Content buffering method and beehive network system in a kind of cellular network
Technical field
Content buffering method and cellular network the invention belongs to field of communication technology, in particular in a kind of cellular network System.
Background technique
The development of mobile Internet is maked rapid progress, and has developed indispensable a part in for people's lives gradually, is moved Dynamic terminal renewal speed is getting faster, and the data flow of cellular network shows explosive growth, this does not require nothing more than mobile network and mentions For high message transmission rate, lower propagation delay time is also required.
5G network includes macro base station and the base station small base station Liang Zhong, forms hierarchical network.Wherein, macro base station is mainly responsible for signaling Control and mobile communication, in the range of each macro base station, small base station dense deployment is mainly responsible for raising network capacity.Macro base It stands and the coverage area of small base station is referred to as macrocell and cell.It is connected between macro base station and small base station by X.2 link, Signaling and data can be transmitted mutually, and above-mentioned X.2 link refers to a node to one section of physical circuit of adjacent node, macro base station Buffer can be set with cache contents, when user terminal, which issues, requests, if station buffer has been deposited with small base station Stored up user request data, can directly in response to request and transferring content to client.When user is moved to from a cell When another cell, base station switches therewith, for example, when user is moved to another macrocell from a macrocell, just The macro base station in macrocell after being switched to.However, the base station after switching is not necessarily cached with the data of user's request, in this way One, caching will interrupt, i.e., cache contents are not migrated from a base station to another with the movement of user terminal Base station, the base station after switching just must obtain corresponding content from core net and be then transmit to user.
When obtaining data from core net due to interruption because caching, the multiple of chain road need to be passed through due to obtaining data from core net Node is forwarded, and propagation delay time when user terminal being caused to receive data increases.
Summary of the invention
The content buffering method and caching system of the embodiment of the present invention being designed to provide in a kind of cellular network, with solution The problem of base station caused by certainly being interrupted due to caching must be obtained target from core net and download content, and propagation delay time increases.Specifically Technical solution is as follows:
In a first aspect, being applied to Cellular Networks the embodiment of the invention provides the content buffering method in a kind of cellular network Network system, the beehive network system include: current base station, the adjacent base station interacted with the current base station, and described current Mobile edge calculations server MEC (Mobile Edge Computing, the mobile edge that base station is connected with the adjacent base station Calculate), and the user terminal being connect with the adjacent base station, which comprises
RSRP (Reference Signal Receiving Power, reference of the user terminal based on multiple adjacent areas Signal reception power), cell transition probability is calculated, and the cell transition probability is sent to the adjacent base station；The neighbour There is the cell of overlapping in the cell range of the institute of user terminal described in Qu Weiyu home cell, the cell transition probability is for indicating The user terminal is transferred to the probability of the cell of the current base station from the cell of the adjacent base station；
The downloading that the adjacent base station calculates the user terminal does not complete probability, and described download is not completed probability hair It send to the current base station, described download does not complete probability for indicating that the user terminal is transferred to institute from the adjacent base station Before stating current base station, the adjacent base station downloads content to user terminal transmission objectives and transmits unfinished probability；
The current base station is worked as according to the historical requests content information recorded in the content popularit list of current area, determination Preceding cell content popularit, the historical requests content information include: access the current base station the user terminal it is more The historical requests number of the title of a historical requests content and the multiple historical requests content；The current area content Popularity is for indicating the multiple historical requests content requested probability within a preset period of time；
The current base station receives the cell transition probability sent by the adjacent base station and adjacent cells content Popularity, and it is based on the cell transition probability, described download does not complete probability and the adjacent cells content popularit, to institute It states current area content popularit to be modified, obtains revised cell content popularit, and by the revised cell Content popularit is recorded to the cell content popularit list, and the adjacent cells content popularit is the adjacent base station meter The obtained cell content popularit of itself；
The MEC receives the revised cell content popularit list sent by the current base station, and based on described Revised cell content popularit list determines optimal caching arrangement matrix, and the optimal caching arrangement matrix is sent To the current base station；Each row of the optimal caching arrangement matrix indicates each base station, and the optimal caching arranges each of matrix Column indicate that whether each content to be downloaded, each element in the optimal caching arrangement matrix are used to indicate each base station to each to be downloaded Content is cached；
The current base station is based on the optimal caching and arranges matrix, caches to target downloading content, and will The target downloading content is sent to the user terminal.
Optionally, the step of RSRP of the user terminal based on multiple adjacent base stations, calculating cell transition probability, packet It includes:
The user terminal utilizes the first default expression formula, calculates cell transition probability, the first default expression formula are as follows:
In formula, YiIndicate that the user terminal is transferred to the cell transition probability of current area, XiIndicate the current base station Reference Signal Received Power RSRP, ∑iXiIndicate the sum of the multiple adjacent area Reference Signal Received Power RSRP.
Optionally, the adjacent base station calculate the user terminal downloading do not complete probability the step of include:
The adjacent base station utilizes the second default expression formula, and the downloading for calculating the user terminal does not complete probability, described Second default expression formula are as follows:
In formula, r indicates message transmission rate, and d indicates the user terminal motion track length in preset time period, v table Show the movement speed of user terminal, B indicates the size of user terminal target downloading content.
Optionally, the current base station includes: current macro base station and current small base station, described general based on cell transfer Rate, described download do not complete probability, and the step of being modified to the current area content popularit includes:
When the current base station is the current macro base station, expression formula is preset using third, to the current base station The current area content popularit is modified, and the third presets expression formula are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell turns Move probability；N indicates that the current macro base station, f indicate historical requests content,It indicates in the current macro base station n preset range Other macro base stations set,It indicates the set of the small base station in the current macro base station n preset range, works as described in m expression Any one macro base station in preceding macro base station n preset range in the set of other macro base stations, n indicate that the current macro base station n is pre- If any one small base station in the set of the small base station in range；pn,fIndicate the historical requests content of the current macro base station Popularity,Indicate the set of other macro base stations current macro base station n preset range Nei to working as The influence of the cell content popularit of preceding macro base station n,It indicates in the current macro base station n preset range Influence of the set of small base station to the content popularit of current macro base station n；
When the current base station is the current small base station, using the 4th default expression formula, to the current base station The current area content popularit is modified, the 4th default expression formula are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell turns Move probability；N indicates the current small base station, and f indicates historical requests content,It indicates in the current small base station n preset range Other small base stations set, s indicates any one in the set of other small base stations in the current small base station n preset range A small base station, pn,fIndicate the historical requests content popularit of the current small base station,Indicate described current Influence of the set of small base station in small base station n preset range to the content popularit of current small base station n.
Optionally, the MEC receives the revised cell content popularit sent by the current base station, and base In the revised cell content popularit, the step of optimal caching arranges matrix is determined, comprising:
The MEC utilizes the 5th default expression formula, calculates optimal caching and arranges matrix, the 5th default expression formula are as follows:
s.t. ∑B·xn,f≤Cn∈NM∪NS
xn,f∈{0,1}
In formula, θk,n,fIndicate service quality QoS Delay Guarantee parameter, rnIndicate message transmission rate, θ is sought in E expressionk,n,f's Mean value, B indicate the size of a historical requests content, CnIndicate base station stored space, xn,fIndicate the caching arrangement matrix, n Indicate the current base station, NMIndicate the set of all macro base stations in the current base station preset range, NSIndicate the current base The set of all small base stations in preset range of standing；
Indicate all bases in beehive network system The summation for the available capacity stood, the available capacity are to reach the message transmission rate of default time delay condition.
Second aspect, the embodiment of the invention provides a kind of beehive network system, the beehive network system includes: current Base station, the adjacent base station interacted with the current base station, the mobile edge being connect with the current base station and the adjacent base station Calculation server MEC, and the user terminal being connect with the adjacent base station,
The user terminal calculates cell transition probability for the Reference Signal Received Power RSRP based on multiple adjacent areas, And the cell transition probability is sent to the adjacent base station；The adjacent area is small with user terminal institute home cell There is the cell of overlapping in area's range；The cell that the cell transition probability is used to indicate the user terminal from the adjacent base station It is transferred to the probability of the cell of the current base station；
The adjacent base station, the downloading for calculating the user terminal does not complete probability, and the downloading is not completed Probability is sent to the current base station, and described download does not complete probability for indicating that the user terminal turns from the adjacent base station Before moving to the current base station, the adjacent base station downloads content to user terminal transmission objectives and transmits unfinished probability；
The current base station, for according to the historical requests content information recorded in the content popularit list of current area, Determine current area content popularit, the historical requests content information includes: the user end for accessing the current base station The title of multiple historical requests contents at end and the historical requests number of the multiple historical requests content；It is described current small Area's content popularit is for indicating the multiple historical requests content requested probability within a preset period of time；
The current base station is also used to receive the cell transition probability sent by the adjacent base station, and closes on Cell content popularit, and it is based on the cell transition probability, described download does not complete probability and the adjacent cells content stream Row degree is modified the current area content popularit, obtains revised cell content popularit, and by the amendment Cell content popularit afterwards is recorded to the cell content popularit list, and the adjacent cells content popularit is the phase The cell content popularit of itself that adjacent base station is calculated；
The MEC for receiving the revised cell content popularit list sent by the current base station, and is based on The revised cell content popularit list determines optimal caching arrangement matrix, and the optimal caching is arranged matrix It is sent to the current base station；Each row of the optimal caching arrangement matrix indicates each base station, and the optimal caching arranges matrix Each column indicate each content to be downloaded, each element in the optimal caching arrangement matrix be used to indicate each base station whether to respectively to Downloading content is cached；
The current base station is also used to delay target downloading content based on the optimal caching arrangement matrix It deposits, and target downloading content is sent to the user terminal.
Optionally, the user terminal is specifically used for:
Using the first default expression formula, cell transition probability, the first default expression formula are calculated are as follows:
In formula, YiIndicate that the user terminal is transferred to the cell transition probability of current area, XiIndicate the current base station Reference Signal Received Power RSRP, ∑iXiIndicate the sum of the multiple adjacent area Reference Signal Received Power RSRP.
Optionally, the adjacent base station, is specifically used for:
Using the second default expression formula, the downloading for calculating the user terminal does not complete probability, the described second default expression Formula are as follows:
In formula, r indicates message transmission rate, and d indicates the user terminal motion track length in preset time period, v table Show the movement speed of user terminal, B indicates the size of user terminal target downloading content.
Optionally, the current base station includes: current macro base station and current small base station；
When the current base station is the current macro base station, the current base station is specifically used for:
Expression formula is preset using third, the current area content popularit of the current base station is modified, institute It states third and presets expression formula are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell turns Move probability；N indicates that the current macro base station, f indicate historical requests content,It indicates in the current macro base station n preset range Other macro base stations set,It indicates the set of the small base station in the current macro base station n preset range, works as described in m expression Any one macro base station in preceding macro base station n preset range in the set of other macro base stations, n indicate that the current macro base station n is pre- If any one small base station in the set of the small base station in range；pn,fIndicate the historical requests content of the current macro base station Popularity,Indicate the set of other macro base stations current macro base station n preset range Nei to working as The influence of the cell content popularit of preceding macro base station n,It indicates in the current macro base station n preset range Influence of the set of small base station to the content popularit of current macro base station n；
When the current base station is the current small base station, it is specifically used for:
Using the 4th default expression formula, the current area content popularit of the current base station is modified, institute State the 4th default expression formula are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell turns Move probability；N indicates the current small base station, and f indicates historical requests content,It indicates in the current small base station n preset range Other small base stations set, s indicates any one in the set of other small base stations in the current small base station n preset range A small base station, pn,fIndicate the historical requests content popularit of the current small base station,Indicate described current Influence of the set of small base station in small base station n preset range to the content popularit of current small base station n.
Optionally, the MEC, is specifically used for:
Using the 5th default expression formula, calculates optimal caching and arranges matrix, the 5th default expression formula are as follows:
s.t. ∑B·xn,f≤Cn∈NM∪NS
xn,f∈{0,1}
In formula, θK, n, fIndicate service quality QoS Delay Guarantee parameter, rnIndicate message transmission rate, θ is sought in E expressionk,n,f's Mean value, B indicate the size of a historical requests content, CnIndicate base station stored space, xn,fIndicate the caching arrangement matrix, n Indicate the current base station, NMIndicate the set of all macro base stations in the current base station preset range, NSIndicate the current base The set of all small base stations in preset range of standing；
Indicate all bases in beehive network system The summation for the available capacity stood, the available capacity are to reach the message transmission rate of default time delay condition.
Content buffering method and beehive network system in a kind of cellular network provided in an embodiment of the present invention, user terminal After RSRP based on multiple adjacent areas calculates cell transition probability, cell transition probability is transmitted to adjacent base station, adjacent base station meter The downloading for calculating user terminal does not complete probability, and current base station is according to the historical requests recorded in the content popularit list of current area Content information determines current area content popularit, and the cell transition probability by being sent by adjacent base station and downloading be not complete At probability, current area content popularit is modified, to obtain revised cell content popularit, MEC receive by The revised cell content popularit list that current base station is sent, and arranged based on revised cell content popularit Table determines the optimal caching arrangement matrix of current base station, since each element in optimal caching arrangement matrix can indicate each base It stands and whether each content to be downloaded is cached, therefore current base station can cache mesh by optimal caching arrangement matrix based on the received Target downloading content is simultaneously sent to the user terminal by mark downloading content, therefore, is moved to currently in user terminal from adjacent base station Before base station, current base station can buffered in advance target download content, to avoid the occurrence of caching disruption, and then avoid because delaying When depositing interruption and obtaining data from core net, it need to be turned by multiple nodes of chain road due to obtaining data from core net The problem of hair, propagation delay time when user terminal being caused to receive data increases.Certainly, implementing method of the invention must not necessarily need To reach all the above advantage simultaneously.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of a scenario of the content buffering method application in a kind of cellular network provided in an embodiment of the present invention；
Fig. 2 is a kind of flow diagram of the content buffering method in a kind of cellular network provided in an embodiment of the present invention；
Fig. 3 is a kind of Signalling exchange signal of the content buffering method in a kind of cellular network provided in an embodiment of the present invention Figure；
Fig. 4 is a kind of configuration diagram of beehive network system provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
It is the schematic diagram of a scenario of the beehive network system of the embodiment of the present invention if Fig. 1 shows, as shown in Figure 1, macro base station M1, M2 and M3, small base station S1, S2, S3, S4, S5, S6 and S7, user terminal U1, U2, U3, U4, U5, U6 and U7, MEC, macro base station can Carried out data transmission with the macro base station with small base station and neighboring community in this cell, small base station can with ownership macro base station with And the small base station of neighboring community carries out data transmission, MEC (Mobile Edge Computing, mobile edge calculations) can be with All base stations in base station shown in Fig. 1 carry out data transmission, and user terminal can carry out data transmission with the base station of connection.
As shown in Fig. 2, can be applied to figure the embodiment of the invention provides the content buffering method in a kind of cellular network Beehive network system shown in 1, the process may comprise steps of:
S101, RSRP of the user terminal based on multiple adjacent areas calculate cell transition probability, and cell transition probability are sent To adjacent base station.
In the embodiment of the present invention, each user terminal can safeguard a NCL (Neighbor Cell List, adjacent area List), it include two contents of RSRP of PCI (Physical Cell Identity, Physical Cell Identifier) and adjacent area in NCL, NCL can be automatically generated by user terminal, and PCI can be used for distinguishing the wireless signal of different community, and MEC available PCI identifies not With cell, RSRP is the key parameter of wireless signal strength in cellular network, and user terminal can will be more in neighboring cell list The RSRP of a adjacent area is normalized, to obtain the cell transition probability of user terminal.It is appreciated that due to the RSRP of a base station It is bigger, it is meant that the base station is closer from user terminal, then user terminal is more possible to be transferred in the cell of the base station, because This, cell transition probability can be obtained based on RSRP.
The normalized of the embodiment of the present invention can by the Reference Signal Received Power RSRP of current base station with it is multiple It is that the sum of adjacent area Reference Signal Received Power RSRP is divided by as a result, as user terminal be transferred to current area cell turn Move probability.
S102, the downloading that adjacent base station calculates user terminal do not complete probability, and will download not completing probability and be sent to and work as Preceding base station, current base station is based on downloading unfinished probability and this cell content popularit may be updated in cell transition probability.
In the embodiment of the present invention, downloading unfinished probability can be used to indicate that user terminal is transferred to currently from adjacent base station Before base station, adjacent base station downloads content to user terminal transmission objectives and transmits unfinished probability.It is appreciated that adjacent base station It can be based on message transmission rate, user terminal motion track length in preset time period, the movement speed and use of user terminal The size of family end objectives downloading content can calculate downloading and not complete probability.It should be noted that above-mentioned preset time period When start time point can start mobile for user terminal, preset time period can be set by administrative staff according to practical business demand It sets, for example, setting are as follows: 5 minutes, 10 minutes or 15 minutes.
S103, current base station determine current according to the historical requests information recorded in the content popularit list of current area The content popularit of cell.
In the embodiment of the present invention, historical requests content information may include: the multiple of the user terminal of access current base station The title of historical requests content, for example, the historical requests number of file, video and multiple historical requests contents.Due to one The historical requests number of historical requests content is more, means that the historical requests content requested probability within a preset period of time It is bigger, thus to the historical requests number of multiple historical requests contents normalization after available each historical requests content it is small Area's content popularit.
The normalized of the embodiment of the present invention can pass through the requested number and current base of a historical requests content In standing the requested number of all historical requests contents be divided by as a result, as cell content popularit, wherein it is above-mentioned small Area's content popularit can be used to indicate that each historical requests content requested probability within a preset period of time, above-mentioned preset time The start time point of section can receive cell transition probability for current base station and download when not completing probability, preset time period It can be arranged by administrative staff according to practical business demand, for example, setting are as follows: 5 minutes, 10 minutes or 15 minutes.
In the embodiment of the present invention, current base station can use preset normalization formula, calculate cell content popularit, should Preset normalization formula can be with are as follows:
In formula, FiIndicate the cell content popularit of a historical requests content, AiIndicate the quilt of a historical requests content Request number of times, ∑iAiIndicate the sum of the requested number of all historical requests contents in current base station.
In the embodiment of the present invention, adjacent base station can also calculate the cell content popularit of itself, certainly, adjacent base station meter It calculates as the process of the cell content popularit of itself with current base station calculates the process of cell content of itself, does not go to live in the household of one's in-laws on getting married herein It states.
S104, current base station receive the cell transition probability sent by adjacent base station and adjacent cells content popularit, And be based on cell transition probability, download and do not complete probability and adjacent cells content popularit, to current area content popularit into Row amendment, obtains revised cell content popularit, and revised cell content popularit is recorded to cell content stream Row degree list.
It is appreciated that when user terminal is moved to current area and connect with current base station, if target downloading content is not Downloading is completed, then can send and request to current base station, and to obtain target downloading content, therefore current base station needs buffered in advance Target downloads content, and before caching of target downloads content, current base station can be based on the cell transition probability of adjacent base station transmission Probability amendment cell content popularit is not completed with downloading, for cell content popularit after amendment, target downloads the stream of content Row degree is enhanced, so that more likely caching of target downloads content to current base station, above-mentioned adjacent cells content popularit is adjacent The cell content popularit of itself that base station is calculated.
S105, MEC receive the revised cell content popularit list sent by current base station, and based on revised Cell content popularit list determines optimal caching arrangement matrix, and optimal caching arrangement matrix is sent to current base station.
After current base station updates cell content popularit, due to needing to arrange that matrix determines whether to mesh by optimal caching Mark downloading content is cached, therefore revised cell content popularit list need to be sent to MEC, and MEC receives system In the revised cell content popularit list that sends of all base stations calculated using the available capacity for maximizing system as target Optimal caching arranges matrix, each element in optimal caching arrangement matrix be used to indicate each base station whether to each content to be downloaded into Row caching.
Wherein, optimal caching arrangement matrix can indicate are as follows:
In formula, XN, fMatrix is arranged for optimal caching, wherein each row of optimal caching arrangement matrix indicates each base station, optimal Each column of caching arrangement matrix indicate each content to be downloaded, XNi, fjF-th of downloading content for indicating i-th of matrix, if XNi, fj =1, then it represents that base station i will cache downloading content f, if XNi, fj=0, then it represents that base station i is not needed to downloading content f It is cached.
S106, current base station are based on optimal caching and arrange matrix, cache to target downloading content, and target is downloaded Content is sent to the user terminal.
Current base station can receive the optimal caching arrangement matrix of MEC transmission, and it is corresponding to find current base station in a matrix Row judges whether that downloading content to target caches according to the numerical value of the corresponding element of target downloading content in the row, if Determination needs to cache, then is sent to the user terminal target downloading content.For example, having 4 elements, corresponding numerical value in the row Respectively 0,1,1,0, wherein 0 indicates not cache, 1 indicates caching, if the corresponding element of target downloading content is in the row 2nd element, the i.e. numerical value of the element are 1, i.e., the numerical value caches target downloading content.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned steps S101 is specifically as follows:
User terminal can use the first default expression formula, calculate cell transition probability, the first default expression formula are as follows:
In formula, YiIndicate that user terminal is transferred to the cell transition probability of current area, XiIndicate the reference letter of current base station Number receive power RSRP, ∑iXiIndicate the sum of multiple adjacent area Reference Signal Received Power RSRP.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned steps S102 is specifically as follows:
Adjacent base station utilizes the second default expression formula, and the downloading for calculating user terminal does not complete probability, the second default expression Formula are as follows:
In formula, r indicates message transmission rate, and d indicates user terminal motion track length in preset time period, and v indicates to use The movement speed of family terminal, B indicate the size of user terminal target downloading content, and the start time point of above-mentioned preset time period can When thinking that user terminal starts mobile, preset time period can be arranged by administrative staff according to practical business demand, for example, setting Are as follows: 5 minutes, 10 minutes or 15 minutes.
Adjacent base station can be obtained by LBS (Location Based Service, mobile location-based service) base station location method To user terminal coordinate, multiple bearing obtains the motion track in user terminal preset time period, according to preset time period and more Secondary to position obtained motion track, adjacent base station is estimated that the movement speed and moving direction of user terminal, in conjunction with user End objectives data cached size and data transfer rate, so that calculating downloading does not complete probability, LBS base station location method is used In the location information for obtaining mobile terminal user.
As a kind of optional embodiment of the embodiment of the present invention, current base station includes: current macro base station and current small base It stands, then above-mentioned steps S104, is specifically as follows:
When current base station is current macro base station, current macro base station can use third and preset expression formula, to current base station Cell content popularit is modified, and third presets expression formula are as follows:
In formula, p indicates cell content popularit, and q, which indicates to download, does not complete probability, and T indicates cell transition probability；N is indicated Current macro base station, f indicate historical requests content,Indicate the set of other macro base stations in current macro base station n preset range,Indicate the set of the small base station in current macro base station n preset range, m indicates other macro bases in current macro base station n preset range Any one macro base station in the set stood, n indicate any one in the set of the small base station in current macro base station n preset range A small base station, wherein above-mentioned preset range indicates the coverage area of beehive network system, and above-mentioned preset range can be by administrator Member is arranged according to practical business demand, for example, setting are as follows: 50000 square metres, 100000 square metres or 150000 square metres.
pn,fIndicate the historical requests content popularit of current macro base station,Indicate current macro Influence of the set of other macro base stations to the cell content popularit of current macro base station n in the n preset range of base station,Indicate content popularit of the set to current macro base station n of the small base station in current macro base station n preset range Influence；
When current base station is current small base station, current small base station can use the 4th default expression formula, to current base station Cell content popularit is modified, the 4th default expression formula are as follows:
In formula, p indicates cell content popularit, and q, which indicates to download, does not complete probability, and T indicates cell transition probability；N is indicated Current small base station, f indicate historical requests content,Indicate the set of other small base stations in current small base station n preset range, s Indicate any one small base station in the set of other small base stations in current small base station n preset range, pn,fIndicate current small base The historical requests content popularit stood,Indicate the set pair of the small base station in current small base station n preset range The influence of the content popularit of current small base station n.
In the embodiment of the present invention, since macro base station coverage area is big, small base station range is small, therefore the shifting of cellular network Mobility management strategy can tend to for the fast user terminal of movement speed being linked into macro base station, so, even if user Moving velocity of terminal is fastly without continually switching base station.For this Mobility Management Strategy, can be fast by movement speed The target downloading content of user terminal is buffered in macro base station as far as possible, conversely, by the target of the slow user terminal of movement speed Content caching is downloaded in small base station.Therefore, macro base station is different with the cell content popularit correction formula of small base station.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned steps S105 is specifically as follows:
MEC utilizes the 5th default expression formula, calculates optimal caching and arranges matrix, the 5th default expression formula are as follows:
s.t. ∑B·xn,f≤Cn∈NM∪NS
xn,f∈{0,1}
In formula, θk,n,fIndicate service quality QoS Delay Guarantee parameter, rnIndicate message transmission rate, θ is sought in E expressionk,n,f's Mean value, B indicate the size of a historical requests content, CnIndicate base station stored space, xn,fIndicate that caching arrangement matrix, n indicate Current base station, NMIndicate the set of all macro base stations in current base station preset range, NSIndicate own in current base station preset range The set of small base station.
For objective function, cellular network is indicated The summation of the available capacity of all base stations in system, available capacity are to reach the message transmission rate of default time delay condition.It is above-mentioned Default time delay condition can be arranged by administrative staff according to practical business demand, for example, setting are as follows: 25ms, 50ms, or 75ms。
First constraint condition s.t. ∑ Bxn,f≤Cn∈NM∪NSIndicate that the total amount of data of each base station stored cannot It is limited more than memory capacity, second constraint condition xn,f∈ { 0,1 } indicates that each element is binary system change in caching arrangement matrix Amount.
QoS guarantee factor θk,n,fIn only xn,fOne variable, xn,fThe size for influencing objective function indirectly, because of xn,fSquare Each of battle array element has 0 and 1 two kind of value, so xn,fMatrix can there are many value modes, so that objective function reaches The x of that value mode of maximum valueN, fMatrix is that optimal caching arranges matrix.The method for solving of objective function include it is convex optimization, Genetic algorithm, greedy algorithm etc..
As a kind of optional embodiment of the embodiment of the present invention, target cache data are sent in user by current base station Process may include:
When current base station is small base station, current small base station searched targets download content, if current small base station has under target Content is carried, then is sent to the user terminal, if it is not, user's request to be forwarded to the macro base station of current small base station ownership.
Macro base station searched targets download content, if macro base station has target to download content, are sent to current small base station, then It is sent to the user terminal by current small base station, if not provided, macro base station searches an adjacent small base station for having target downloading content, It orders adjacent small base station to send target and downloads content to current small base station, then be sent to the user terminal by current small base station.
It is moved to such as user terminal U2 in the cell of small base station S3, small base station S3 retrieves in this base station stored data whether have The target of user terminal U2 downloads content, if so, target downloading content is sent to the user terminal U2 by small base station S3, if do not had Have, the request of user terminal U2 is forwarded to ownership macro base station M3 by small base station S3, and macro base station M3 is retrieved in this base station stored data Whether the target downloading content of user terminal U2 is had, if with target downloading content being just sent to small base station S3, then by small base The S3 that stands is sent to the user terminal U2, if not provided, whether look up has target to download content in adjacent small base station S1 and S2, if Having in the storing data of small base station S1, then target downloading content is sent to small base station S3 by the small base station S1 of macro base station M3 order, then User is sent to by small base station S3.
When current base station is macro base station, current macro base station searched targets download content, if current macro base station has under target Content is carried, then is sent to the user terminal；If it is not, user's request is forwarded to neighbouring macro base station.
If neighbouring macro base station has target to download content, target downloading content is sent to current macro base station, then by working as Preceding macro base station is sent to the user terminal, if neighbouring macro base station does not have target to download content, current macro base station is obtained from core net Target downloading content is taken to retransmit to user terminal.
If user terminal U3 is moved in the cell of macro base station M2, macro base station M2 retrieve in this base station stored data whether There is the target downloading content of user terminal U3, if so, target downloading content is sent to the user terminal U3 by macro base station M2, if No, then user terminal U3 request is forwarded to neighbouring macro base station M1 and M3, if neighbouring macro base station M1 has user terminal U3's Target downloads content, then target downloading content is sent to macro base station M2, then be sent to the user terminal U3 by macro base station M2, if Neighbouring macro base station M1 and neighbouring macro base station M2 download content without target, then macro base station M2 is obtained under target from core net Content is carried to retransmit to user terminal U3.
Content buffering method in a kind of cellular network provided in an embodiment of the present invention, user terminal is based on multiple adjacent areas After RSRP calculates cell transition probability, cell transition probability is transmitted to adjacent base station, adjacent base station calculates under user terminal It carries and does not complete probability, current base station is determined according to the historical requests content information recorded in the content popularit list of current area Current area content popularit, and the cell transition probability by being sent by adjacent base station and downloading do not complete probability, to current Cell content popularit is modified, to obtain revised cell content popularit, and by revised cell content stream Row degree is recorded to cell content popularit list；It is popular that MEC receives the revised cell content sent by current base station List is spent, and is based on revised cell content popularit list, the optimal caching arrangement matrix of current base station is determined, due to most Each element in excellent caching arrangement matrix can indicate whether each base station caches each content to be downloaded, therefore current base station Optimal caching arrangement matrix caching of target it can download content based on the received and be sent to the user terminal target downloading content, Therefore, before user terminal is moved to current base station from adjacent base station, current base station can buffered in advance target download content, from And avoid the occurrence of caching disruption, and then avoid because cache interrupt due to from core net obtain data when, due to being obtained from core net Access is forwarded according to the multiple nodes that need to pass through chain road, and what propagation delay time when user terminal being caused to receive data increased asks Topic.
As shown in figure 4, the embodiment of the invention also provides a kind of beehive network system beehive network systems, comprising: when Preceding base station, the adjacent base station interacted with current base station, the mobile edge calculations server being connect with current base station and adjacent base station MEC, and the user terminal being connect with adjacent base station.
User terminal 201 calculates cell transition probability, and cell transition probability is sent to for normalizing RSRP Adjacent base station；Adjacent area is there are Chong Die cells with the cell range of user terminal institute home cell；Cell transition probability is used for Indicate that user terminal is transferred to the probability of the cell of current base station from the cell of adjacent base station.
Adjacent base station 202, the downloading for calculating user terminal do not complete probability, and will download unfinished probability and be sent to Current base station is downloaded and is not completed before probability is transferred to current base station from adjacent base station for indicating user terminal, adjacent base station to The probability that user terminal transmission objectives downloads content and transmission does not complete.
Current base station 203, for according to the historical requests content information recorded in the content popularit list of current area, really Determine current area content popularit, historical requests content information includes: that multiple history of the user terminal of access current base station are asked Ask the title of content and the historical requests number of multiple historical requests contents；Current area content popularit is for indicating more A historical requests content requested probability within a preset period of time.
Wherein, current base station 203 is also used to receive by the cell transition probability of adjacent base station transmission and adjacent cells Hold popularity, and be based on cell transition probability, downloads and do not complete probability and adjacent cells content popularit, to current area content Popularity is modified, and obtains revised cell content popularit, and revised cell content popularit is recorded to small Area's content popularit list.
MEC204, for receiving the revised cell content popularit list sent by current base station, and based on amendment Cell content popularit list afterwards determines optimal caching arrangement matrix, and optimal caching arrangement matrix is sent to current base It stands；Each row of optimal caching arrangement matrix indicates each base station, and each column of optimal caching arrangement matrix indicate each content to be downloaded, most Each element in excellent caching arrangement matrix is used to indicate whether each base station caches each content to be downloaded.
Current base station is also used to receive optimal caching arrangement matrix, arranges matrix based on optimal caching, in target downloading Appearance is cached, and target downloading content is sent to the user terminal.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned user terminal 201 is specifically used for:
Using the first default expression formula, cell transition probability, the first default expression formula are calculated are as follows:
In formula, YiIndicate that the user terminal is transferred to the cell transition probability of current area, XiIndicate the current base station Reference Signal Received Power RSRP, ∑iXiIndicate the sum of the multiple adjacent area Reference Signal Received Power RSRP.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned adjacent base station 202 is specifically used for:
Using the second default expression formula, the downloading for calculating user terminal does not complete probability, the second default expression formula are as follows:
In formula, r indicates message transmission rate, and d indicates user terminal motion track length in preset time period, and v indicates to use Family terminal transports movement speed, and B indicates the size of user terminal target downloading content.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned current base station 203, comprising: current macro base station and Current small base station.
When current base station is current macro base station, it is specifically used for:
Expression formula is preset using third, the current area content popularit of current base station is modified, third preset table Up to formula are as follows:
In formula, p indicates cell content popularit, and q, which indicates to download, does not complete probability, and T indicates cell transition probability；N is indicated Current macro base station, f indicate historical requests content,Indicate the set of other macro base stations in current macro base station n preset range,Indicate the set of the small base station in current macro base station n preset range, m indicates other macro bases in current macro base station n preset range Any one macro base station in the set stood, n indicate any one in the set of the small base station in current macro base station n preset range A small base station；
pn,fIndicate the historical requests content popularit of current macro base station,Indicate current macro Influence of the set of other macro base stations to the cell content popularit of current macro base station n in the n preset range of base station,Indicate that the set of the small base station in current macro base station n preset range is popular to the content of current macro base station n The influence of degree；
When current base station is current small base station, it is specifically used for:
Using the 4th default expression formula, the current area content popularit of current base station is modified, the 4th preset table Up to formula are as follows:
In formula, p indicates cell content popularit, and q, which indicates to download, does not complete probability, and T indicates cell transition probability；N is indicated Current small base station, f indicate historical requests content,Indicate the set of other small base stations in current small base station n preset range, s Indicate any one small base station in the set of other small base stations in current small base station n preset range, pn,fIndicate current small base It stands the historical requests content popularit of n,Indicate the set of the small base station in current small base station n preset range Influence to the content popularit of current small base station n.
As a kind of optional embodiment of the embodiment of the present invention, above-mentioned MEC204 is specifically used for:
Using the 5th default expression formula, calculates optimal caching and arranges matrix, the 5th default expression formula are as follows:
s.t. ∑B·xn,f≤Cn∈NM∪NS
xn,f∈{0,1}
In formula, θk,n,fIndicate service quality QoS Delay Guarantee parameter, rnIndicate message transmission rate, θ is sought in E expressionk,n,f's Mean value, B indicate the size of a historical requests content, CnIndicate base station stored space, xn,fIndicate that caching arrangement matrix, n indicate Current base station, NMIndicate the set of all macro base stations in current base station preset range, NSIndicate own in current base station preset range The set of small base station；
Indicate all bases in beehive network system The summation for the available capacity stood, available capacity are to reach the message transmission rate of default time delay condition.
A kind of beehive network system provided in an embodiment of the present invention, user terminal calculate cell based on the RSRP of multiple adjacent areas After transition probability, cell transition probability is transmitted to adjacent base station, the downloading that adjacent base station calculates user terminal does not complete probability, Current base station determines current area content stream according to the historical requests content information recorded in the content popularit list of current area Row degree, and the cell transition probability by being sent by adjacent base station and downloading do not complete probability, to current area content popularit It is modified, to obtain revised cell content popularit, and revised cell content popularit is recorded to cell Content popularit list, MEC receive the revised cell content popularit list sent by current base station, and are based on repairing Cell content popularit list after just determines the optimal caching arrangement matrix of current base station, since optimal caching arranges matrix In each element can indicate whether each base station caches each content to be downloaded, therefore current base station can be based on the received Target downloading content is simultaneously sent to the user terminal by optimal caching arrangement matrix caching of target downloading content, therefore, at user's end Before end is moved to current base station from adjacent base station, current base station can buffered in advance target download content, to avoid the occurrence of slow When depositing disruption, and then avoiding obtaining data from core net due to interruption because caching, it need to pass through due to obtaining data from core net The problem of multiple nodes of chain road are forwarded, and propagation delay time when user terminal being caused to receive data increases.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method Part explanation.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the scope of the present invention.It is all Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention, are all contained in protection scope of the present invention It is interior.

Claims (10)

1. the content buffering method in a kind of cellular network, which is characterized in that be applied to beehive network system, the cellular network System includes: current base station, the adjacent base station interacted with the current base station, is connected with the current base station and the adjacent base station The mobile edge calculations server MEC connect, and the user terminal being connect with the adjacent base station, which comprises
Reference Signal Received Power RSRP of the user terminal based on multiple adjacent areas calculates cell transition probability, and will be described Cell transition probability is sent to the adjacent base station；The adjacent area is deposits with the cell range of user terminal institute home cell In the cell of overlapping, the cell transition probability is for indicating that the user terminal is transferred to institute from the cell of the adjacent base station State the probability of the cell of current base station；
The downloading that the adjacent base station calculates the user terminal does not complete probability, and the downloading is not completed probability and is sent to The current base station, described download do not complete probability for indicating that the user terminal is transferred to described work as from the adjacent base station Before preceding base station, the adjacent base station downloads content to user terminal transmission objectives and transmits unfinished probability；
The current base station determines current small according to the historical requests content information recorded in the content popularit list of current area Area's content popularit, the historical requests content information include: to access the multiple of the user terminal of the current base station to go through The historical requests number of the title of history request content and the multiple historical requests content；The current area content is popular Degree is for indicating the multiple historical requests content requested probability within a preset period of time；
The current base station receives the cell transition probability sent by the adjacent base station and adjacent cells content is popular Degree, and it is based on the cell transition probability, described download does not complete probability and the adjacent cells content popularit, works as to described Preceding cell content popularit is modified, and obtains revised cell content popularit, and by the revised cell content Popularity is recorded to the cell content popularit list, and the adjacent cells content popularit is that the adjacent base station calculates The cell content popularit of itself arrived；
The MEC receives the revised cell content popularit list sent by the current base station, and is based on the amendment Cell content popularit list afterwards determines optimal caching arrangement matrix, and the optimal caching arrangement matrix is sent to institute State current base station；Each row of the optimal caching arrangement matrix indicates each base station, each list of the optimal caching arrangement matrix Show that whether each content to be downloaded, each element in the optimal caching arrangement matrix are used to indicate each base station to each content to be downloaded It is cached；
The current base station is based on the optimal caching and arranges matrix, caches to target downloading content, and will be described Target downloading content is sent to the user terminal.
2. the method according to claim 1, wherein RSRP of the user terminal based on multiple adjacent base stations, The step of calculating cell transition probability, comprising:
The user terminal utilizes the first default expression formula, calculates cell transition probability, the first default expression formula are as follows:
In formula, YiIndicate that the user terminal is transferred to the cell transition probability of current area, XiIndicate the ginseng of the current base station Examine signal reception power RSRP, ∑iXiIndicate the sum of the multiple adjacent area Reference Signal Received Power RSRP.
3. the method according to claim 1, wherein the adjacent base station calculates the downloading of the user terminal not Complete probability the step of include:
The adjacent base station utilize the second default expression formula, calculate the user terminal downloading do not complete probability, described second Default expression formula are as follows:
In formula, r indicates message transmission rate, and d indicates the user terminal motion track length in preset time period, and v indicates to use The movement speed of family terminal, B indicate the size of user terminal target downloading content.
4. the method according to claim 1, wherein the current base station includes: current macro base station and current small Base station, described to be based on the cell transition probability, described download does not complete probability, carries out to the current area content popularit The step of amendment includes:
When the current base station is the current macro base station, expression formula is preset using third, to described in the current base station Current area content popularit is modified, and the third presets expression formula are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell transfer is general Rate；N indicates that the current macro base station, f indicate historical requests content,Indicate its in the current macro base station n preset range The set of his macro base station,Indicate the set of the small base station in the current macro base station n preset range, m indicates described current macro Any one macro base station in the n preset range of base station in the set of other macro base stations, n indicate that the current macro base station n presets model Any one small base station in the set of small base station in enclosing；pN, fIndicate that the historical requests content of the current macro base station is popular Degree,Indicate the set of other macro base stations current macro base station n preset range Nei to current macro The influence of the cell content popularit of base station n,Indicate the small base in the current macro base station n preset range Influence of the set stood to the content popularit of current macro base station n；
When the current base station is the current small base station, using the 4th default expression formula, to described in the current base station Current area content popularit is modified, the 4th default expression formula are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell transfer is general Rate；N indicates the current small base station, and f indicates historical requests content,Indicate its in the current small base station n preset range The set of his small base station, s indicate in the set of other small base stations in the current small base station n preset range any one is small Base station, pN, fIndicate the historical requests content popularit of the current small base station,Indicate the current small base Influence of the set for the small base station stood in n preset range to the content popularit of current small base station n.
5. the method according to claim 1, wherein the MEC receives the amendment sent by the current base station Cell content popularit list afterwards, and it is based on the revised cell content popularit list, determine the optimal caching The step of arranging matrix, comprising:
The MEC utilizes the 5th default expression formula, calculates optimal caching and arranges matrix, the 5th default expression formula are as follows:
s.t.∑B·xN, f≤Cn n∈NM∪NS
xN, f∈ { 0,1 }
In formula, θK, n, fIndicate service quality QoS Delay Guarantee parameter, rnIndicate message transmission rate, θ is sought in E expressionK, n, fIt is equal Value, B indicate the size of a historical requests content, CnIndicate base station stored space, xN, fIndicate the caching arrangement matrix, n table Show the current base station, NMIndicate the set of all macro base stations in the current base station preset range, NSIndicate the current base station The set of all small base stations in preset range；
All base stations has in expression beehive network system The summation of capacity is imitated, the available capacity is to reach the message transmission rate of default time delay condition.
6. a kind of beehive network system characterized by comprising current base station, the adjacent base station interacted with the current base station, The mobile edge calculations server MEC being connect with the current base station and the adjacent base station, and connect with the adjacent base station The user terminal connect；
The user terminal calculates cell transition probability for the Reference Signal Received Power RSRP based on multiple adjacent areas, and will The cell transition probability is sent to the adjacent base station；The adjacent area is the cell model with user terminal institute home cell Enclose the cell in the presence of overlapping；The cell transition probability is for indicating that the user terminal is shifted from the cell of the adjacent base station To the probability of the cell of the current base station；
The adjacent base station, the downloading for calculating the user terminal does not complete probability, and described download is not completed probability It is sent to the current base station, described download does not complete probability for indicating that the user terminal is transferred to from the adjacent base station Before the current base station, the adjacent base station downloads content to user terminal transmission objectives and transmits unfinished probability；
The current base station, for determining according to the historical requests content information recorded in the content popularit list of current area Current area content popularit, the historical requests content information include: the user terminal for accessing the current base station The historical requests number of the title of multiple historical requests contents and the multiple historical requests content；In the current area Hold popularity for indicating the multiple historical requests content requested probability within a preset period of time；
The current base station is also used to receive the cell transition probability sent by the adjacent base station and adjacent cells Content popularit, and it is based on the cell transition probability, described download does not complete probability and the adjacent cells content popularit, The current area content popularit is modified, obtains revised cell content popularit, and will be described revised Cell content popularit is recorded to the cell content popularit list, and the adjacent cells content popularit is the adjacent base The cell content popularit of itself that station is calculated；
The MEC, for receiving the revised cell content popularit list sent by the current base station, and based on described Revised cell content popularit list determines optimal caching arrangement matrix, and the optimal caching arrangement matrix is sent To the current base station；Each row of the optimal caching arrangement matrix indicates each base station, and the optimal caching arranges each of matrix Column indicate that whether each content to be downloaded, each element in the optimal caching arrangement matrix are used to indicate each base station to each to be downloaded Content is cached；
The current base station is also used to cache target downloading content based on the optimal caching arrangement matrix, and Target downloading content is sent to the user terminal.
7. system according to claim 6, which is characterized in that the user terminal is specifically used for:
Using the first default expression formula, cell transition probability, the first default expression formula are calculated are as follows:
In formula, YiIndicate that the user terminal is transferred to the cell transition probability of current area, XiIndicate the ginseng of the current base station Examine signal reception power RSRP, ∑iXiIndicate the sum of the multiple adjacent area Reference Signal Received Power RSRP.
8. system according to claim 6, which is characterized in that the adjacent base station is specifically used for:
Using the second default expression formula, the downloading for calculating the user terminal does not complete probability, the second default expression formula are as follows:
In formula, r indicates message transmission rate, and d indicates the user terminal motion track length in preset time period, and v indicates to use The movement speed of family terminal, B indicate the size of user terminal target downloading content.
9. system according to claim 6, which is characterized in that the current base station includes: current macro base station and current small Base station；
When the current base station is the current macro base station, the current base station is specifically used for:
Expression formula is preset using third, the current area content popularit of the current base station is modified, described Three default expression formulas are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell transfer is general Rate；N indicates that the current macro base station, f indicate historical requests content,Indicate its in the current macro base station n preset range The set of his macro base station,Indicate the set of the small base station in the current macro base station n preset range, m indicates described current macro Any one macro base station in the n preset range of base station in the set of other macro base stations, n indicate that the current macro base station n presets model Any one small base station in the set of small base station in enclosing；pN, fIndicate that the historical requests content of the current macro base station is popular Degree,Indicate the set of other macro base stations current macro base station n preset range Nei to current macro The influence of the cell content popularit of base station n,Indicate the small base in the current macro base station n preset range Influence of the set stood to the content popularit of current macro base station n；
When the current base station is the current small base station, it is specifically used for:
Using the 4th default expression formula, the current area content popularit of the current base station is modified, described Four default expression formulas are as follows:
In formula, p indicates the cell content popularit, and q indicates that described download does not complete probability, and T indicates that the cell transfer is general Rate；N indicates the current small base station, and f indicates historical requests content,Indicate its in the current small base station n preset range The set of his small base station, s indicate in the set of other small base stations in the current small base station n preset range any one is small Base station, pN, fIndicate the historical requests content popularit of the current small base station,Indicate the current small base Influence of the set for the small base station stood in n preset range to the content popularit of current small base station n.
10. system according to claim 6, which is characterized in that the MEC is specifically used for:
Using the 5th default expression formula, calculates optimal caching and arranges matrix, the 5th default expression formula are as follows:
s.t.∑B·xN, f≤Cn n∈NM∪NS
xN, f∈ { 0,1 }
In formula, θK, n, fIndicate service quality QoS Delay Guarantee parameter, rnIndicate message transmission rate, θ is sought in E expressionK, n, fIt is equal Value, B indicate the size of a historical requests content, CnIndicate base station stored space, xN, fIndicate the caching arrangement matrix, n table Show the current base station, NMIndicate the set of all macro base stations in the current base station preset range, NSIndicate the current base station The set of all small base stations in preset range；
Indicate all base stations in beehive network system The summation of available capacity, the available capacity are to reach the message transmission rate of default time delay condition.
CN201910750358.9A 2019-08-14 2019-08-14 Content caching method in cellular network and cellular network system Active CN110505666B (en)

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