CN109246763A - Substation wirelessly caches trunking method and substation wirelessly caches relay system - Google Patents
Substation wirelessly caches trunking method and substation wirelessly caches relay system Download PDFInfo
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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- H02J13/0075—
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/16—Electric power substations
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
Abstract
The present invention provides that a kind of substation wirelessly caches trunking method and substation wirelessly caches relay system, is related to wireless relay field.It includes: the request of data that the caching relay reception terminal is sent that the substation, which wirelessly caches trunking method, and the request of data is transmitted to electric power wireless private network macro base station PWPN-MBS；If after the operation, management, maintenance OAM in the PWPN-MBS determine that the request of data meets preset condition, then the control signal of PWPN-MBS described in the caching relay reception executes caching mechanism, wherein, the caching mechanism includes data cached and retrieval data；Trunking method is wirelessly cached using the substation, method can reduce bandwidth usage when repetitive requests identical data, and optimization link circuit resource distribution improves the terminal in substation to the access efficiency of smart grid scheduling system history data service.
Description
Technical field
The present invention relates to wireless relaying technique field, in particular to a kind of substation wirelessly caches trunking method and substation
Wireless caching relay system.
Background technique
In smart grid scheduling system, voltage value, frequency values, exchange the line segment endpoint, transformer winding, open circuit of bus
The historical data values of the large number of equipment such as active power value, reactive power value, the current value of device etc., are mentioned by historical data service
For, then show historical data variation in the form of curve or table, facilitate dispatcher intuitively to monitor operation of power networks situation.
Since power business has the demand of real-time and reliability, so needing to reduce the terminal and scheduling in substation
Communication delay between system improves terminal to the access efficiency of historical data service, and in practical application, indoor terminal is a kind of
Typical scene, signal have to penetrate through the wall of building, this will lead to very high penetration loss, significantly reduce wireless transmission
Data rate, spectrum efficiency and energy efficiency；Conventional method is by that will have the indoor-outdoor of large-scale antenna array relaying
System introduces outside each building to connect electric power wireless private network macro base station, i.e. indoor-outdoor junction network structure；However this
Kind connection lacks certain economic validity, the historical data of most of prevalences, repeatability with higher, i.e., many terminals
Identical content may be continuously requested, therefore the identical content of repeated downloads occupies massive band width.
Summary of the invention
It is an object of the present invention in view of the deficiency of the prior art, a kind of substation is provided and wirelessly caches relaying
Method and a kind of substation wirelessly cache relay system, and this method can reduce bandwidth occupancy when repetitive requests identical data
Amount, optimization link circuit resource distribution, the terminal improved in substation imitate the access of smart grid scheduling system history data service
Rate reduces the flow load of PWPN-MBS, improves the handling capacity of system.
To achieve the above object, technical solution used in the embodiment of the present invention is as follows:
In a first aspect, the embodiment of the invention provides a kind of substations wirelessly to cache trunking method, comprising:
A kind of substation wirelessly caches trunking method, which comprises
The request of data that the caching relay reception terminal is sent, and the request of data is transmitted to PWPN-MBS；
If after the OAM in the PWPN-MBS determines that the request of data meets preset condition, the caching relaying is connect
The control signal for receiving the PWPN-MBS executes caching mechanism, wherein the caching mechanism includes data cached stage and retrieval
Data phase.
Further, bandwidth allocation ratio α, the bandwidth allocation ratio are carried in the control signalWherein, the RthFor the minimum data rate threshold value of each terminal, the T is total number of terminals, described
ciuFor the total bandwidth of the caching relaying.
Further, the PWPN-MBS determines the step of request of data meets preset condition, comprising:
The OAM of the PWPN-MBS is detected when having historical data solicited message in the request of data, can be according to electric power industry
Scenario parameters calculating be engaged in using the handling capacity of the caching relaying, is relayed if being greater than using the handling capacity for caching relaying using tradition
Handling capacity, it is determined that the request of data meets preset condition.
Further, the power business scenario parameters include: the PWPN-MBS and it is described caching relaying between away from
From, average distance between the PWPN-MBS and outdoor terminals, the quantity of indoor terminal, the quantity of outdoor terminals.
Further, the step of caching relaying executes caching mechanism, comprising:
Caching relaying according to historical data solicited message retrieval with the presence or absence of corresponding data cached, if deposited
Data cached terminal is being sent to for described；If it does not, obtaining the historical data request letter from the PWPN-MBS
Corresponding data are ceased to be cached and be sent to terminal.
A kind of substation wirelessly caches trunking method, which comprises
The PWPN-MBS receives the request of data of terminal described in the caching relay forwarding；
If after the OAM in the PWPN-MBS determines that the request of data meets preset condition, sending control signal to institute
It states caching relaying and executes caching mechanism, wherein the caching mechanism includes data cached stage and retrieval data phase.
Further, bandwidth allocation ratio α, the bandwidth allocation ratio are carried in the control signalWherein, the RthFor the minimum data rate threshold value of each terminal, the T is total number of terminals, described
ciuFor the total bandwidth of the caching relaying.
Further, the PWPN-MBS determines the step of request of data meets preset condition, comprising:
The OAM of the PWPN-MBS is detected when having historical data solicited message in the request of data, can be according to electric power industry
Scenario parameters calculating be engaged in using the handling capacity of the caching relaying, is relayed if being greater than using the handling capacity for caching relaying using tradition
Handling capacity, it is determined that the request of data meets preset condition.
Further, the power business scenario parameters include: the PWPN-MBS and it is described caching relaying between away from
From, average distance between the PWPN-MBS and outdoor terminals, the quantity of indoor terminal, the quantity of outdoor terminals.
Further, if according to the historical data solicited message retrieval less than it is corresponding data cached when, the PWPN-
MBS can obtain the corresponding data of the historical data solicited message and issue the caching relaying.
Second aspect, the embodiment of the invention also provides a kind of substations wirelessly to cache relay system, including at least one
Using the caching relaying of first aspect the method, at least one using first aspect the method PWPN-MBS and at least
One terminal, the PWPN-MBS, caching relaying and the terminal device are wirelessly connected.
The beneficial effects of the present invention are: bandwidth usage when can reduce repetitive requests identical data, optimization link money
Source distribution improves the terminal in substation to the access efficiency of smart grid scheduling system history data service, reduces PWPN-
The flow load of MBS improves the handling capacity of system.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 provides the component diagram that wireless substation wirelessly caches relay system for the embodiment of the present invention；
Fig. 2 is the flow chart of caching relaying provided in an embodiment of the present invention；
Fig. 3 is the flow chart of PWPN-MBS provided in an embodiment of the present invention；
Fig. 4 provides the signaling diagram that wireless substation wirelessly caches relay system for the embodiment of the present invention；
Fig. 5 provides the flow chart that wireless substation wirelessly caches relay system for the embodiment of the present invention.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented
The component of example can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimed
The scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiments of the present invention, this field is common
Technical staff's every other embodiment obtained without creative efforts belongs to the model that the present invention protects
It encloses.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.
In the description of the present invention, it is also necessary to which explanation is unless specifically defined or limited otherwise, term " setting ",
" installation ", " connected ", " connection " shall be understood in a broad sense, for example, it may be fixedly connected, may be a detachable connection or one
Connect to body；It can be mechanical connection, be also possible to be electrically connected；It can be directly connected, it can also be indirect by intermediary
It is connected, can be the connection inside two elements.For the ordinary skill in the art, on being understood with concrete condition
State the concrete meaning of term in the present invention.
As shown in Figure 1, technical solution provided by the invention includes PWPN-MBS (Power Wireless Private
Network-Macro Base Station, electric power wireless private network macro base station), caching relaying and terminal, PWPN-MBS can be mentioned
For cellular mobile network access, cellular mobile network include 2G (Second Generation, Generation Mobile Telecommunication System technology),
3G (Third Generation, fourth generation mobile communication technology) 4G (Fourth Generation, forth generation mobile communication skill
Art), 4G+ or 5G (Fifth Generation, the 5th third-generation mobile communication technology) etc..Typical 4G network includes long term evolution
(Long Term Evolution, LET) network etc. caches the cellular mobile network signal of relay reception PWPN-MBS, and will letter
Number strengthen amplification, then the signal of amplification is issued, provides access service for terminal；The terminal can directly connect from PWPN-MBS
Enter cellular mobile network, access cellular mobile network can also be relayed from caching.
By in PWPN-MBS cell, may include that multiple cachings relay, the caching relaying can divide the terminal
Cloth indoors, can also be distributed in outdoor, and the canonical form of branch is indoor distributed system indoors, can serve all kinds of rooms
Interior terminal is illustrated by taking indoor caching relaying and indoor terminal as an example in an embodiment of the present invention, in need in client
When, also expansible application is outdoor caching relaying and terminal.
As shown in Fig. 2, the embodiment of the present invention, which provides a kind of substation, wirelessly caches trunking method, it is applied to caching relaying,
Include:
S101 caches the request of data that relay reception terminal is sent, and the request of data is transmitted to PWPN-MBS.
Specifically, the requested data of request of data include voltage value, the frequency of bus in smart grid scheduling system
The large number of equipment such as active power value, reactive power value, the current value of rate value, exchange line segment endpoint, transformer winding, breaker etc.
Historical data values, specific data type is not limited to above-mentioned data, depending on the concrete condition of terminal user.
If after the OAM in the S102 PWPN-MBS determines that the request of data meets preset condition, in the caching
Execute caching mechanism after the control signal for receiving the PWPN-MBS, wherein the caching mechanism include the data cached stage and
Retrieve data phase；
Specifically, OAM continues to determine whether the request of data meets preset condition after executing caching mechanism, if
Preset condition is still met, then keeps the state for executing caching mechanism, if discovery is unsatisfactory for, is sent to PWPN-MBS and terminates letter
Number, the termination signal is sent to caching relaying by PWPN-MBS, and the caching relaying exits caching mechanism, while retaining caching
In data.
Wherein, above-mentioned caching relay reception to the PWPN-MBS control signal when, the PWPN-MBS control letter
Bandwidth allocation ratio α, the bandwidth allocation ratio are also carried in numberWherein, the RthFor each end
The minimum data rate threshold value at end, the T are total number of terminals, the ciuFor the total bandwidth of the caching relaying.
Above-mentioned bandwidth allocation ratio α refers to the ratio of two parts of the bandwidth of PWPN-MBS, wherein one
Part is for data cached bandwidth, and another part is the bandwidth for service terminal.Calculate SiFormula be It is rewritten
It obtains The formula can simplify for
Normal form, whereinFor its symmetric points, E determines its monotonicity, and It follows that SiIn [0,1]
Upper monotonic increase, therefore, under the premise of guaranteeing terminal service quality, when α reaches maximum value, whole system handling capacity SiIt will reach
To maximum value.
The PWPN-MBS determines the step of request of data meets preset condition, comprising: the OAM of the PWPN-MBS
It detects when having historical data solicited message in the request of data, can be calculated according to power business scenario parameters and use the caching
The handling capacity of relaying, if being greater than the handling capacity using tradition relaying using the handling capacity of caching relaying, it is determined that the data are asked
It asks and meets preset condition.
Specifically, the PWPN-MBS was determined in the step of request of data meets preset condition, OAM is according to the electricity
Power business scenario parameter calculates the handling capacity using caching relaying, and target is to obtain the maximize handling capacity within a period
Si, handling capacity consists of three parts:
The summation of all terminal speeds when first part is data cached, second part be retrieval data when and PWPN-MBS
The summation of connected outdoor terminals rate, last part are to use the indoor terminal rate of caching relaying after retrieving data
Summation；
The handling capacity of tradition relaying is regarded as total bandwidth divided by total indoor terminal multiplied by achievable rate；
Achievable rate is calculated multiplied by the ratio for distributing to terminal divided by total number of terminals by total bandwidth；
OAM is compared by the counted handling capacity using caching relaying and using the handling capacity of tradition caching, if using
The handling capacity for caching relaying is big, then it is assumed that meet preset condition, it is on the contrary then think to be unsatisfactory for preset condition.
The power business scenario parameters include:
The distance between the PWPN-MBS and caching relaying, being averaged between the PWPN-MBS and outdoor terminals
Distance, the quantity of indoor terminal, the quantity of outdoor terminals.
Specifically, calculating SiUsed parameter includes the distance between the PWPN-MBS and the caching relaying dij,
Average distance between the PWPN-MBS and outdoor terminalsThe quantity of indoor terminalThe quantity T of outdoor terminalsout。
In the present embodiment, firstly, defining the bandwidth ratio that each relay distribution arrives is αj, it and indoor terminal quantity Tj
And it is relayed to the rate R of indoor terminaljkDirectly proportional and PWPN-MBS to the distance between relaying dijIt is inversely proportional.Therefore, no
With the α of relayingjIt can be represented asWherein cijAnd dijIt is directly proportional.
It can be expressed as in the bandwidth in data cached stage, each terminal (including indoor and outdoors)Wherein B is the number of RB, and W is the bandwidth of each RB；In retrieval data phase, due to interior
Independent service of the terminal by cache (Cache), therefore the bandwidth of each outdoor terminals can be expressed as
In addition, being transmitted since the data cached received data volume of stage cache is equal to retrieval data phase to indoor terminal
Data volume, therefore have αjBWcijt1=RjuTjt2, j=1,2 ..., N, u ∈ Tj, by the formula and αjOur available caching numbers
According to the time t in stage and retrieval data phase1And t2It is respectively
Our available calculating S as a result,iFormula be
The formula include three parts: first part be all terminal speeds of data cached stage and；Second part is
The sum for the outdoor terminals rate that retrieval data phase is connected with PWPN-MBS；Part III is that retrieval data phase is taken by caching
The sum of the indoor terminal rate of business.
The step of caching relaying executes caching mechanism, comprising: the caching relaying is requested according to the historical data
Information retrieval is with the presence or absence of corresponding data cached, if it does, data cached being sent to terminal for described；If it does not,
The corresponding data of the historical data solicited message are obtained from the PWPN-MBS to be cached and be sent to terminal.
Specifically, caching relaying includes two stages, referred to as data cached stage and inspection the step of executing caching mechanism
Rope data phase；
In the data cached stage, the caching relaying is obtained from PWPN-MBS and is corresponded to according to historical data solicited message
Historical data, and in the buffer by the history data store, while the historical data is sent to the terminal；
In the data cached stage, indoor terminal is communicated by caching relaying with PWPN-MBS.Assuming that from PWPN-MBS to slow
The data rate for depositing relaying is Rij, being relayed to the data rate of indoor terminal from caching is Rju；Mark just as assessing a system
Standard is that it is how well the same under worst performance, and the reception data rate of indoor terminal is min (Rij,Rju)；In the present embodiment
In, since indoor communications can work in the emerging frequency band with enough resources, such as millimeter wave, it can be assumed that Rju>
Rij；Therefore, data rate of the receiving velocity of indoor terminal only between PWPN-MBS and relaying is related, i.e. Rij；
In the data cached stage, c can be expressed as by transmitting the accessible rate of dataiu.According to shannon formula, ciuIt can be with
With the logarithmic function of Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio, SINR)
It indicates；Wherein its channel gain between the transmission power of PWPN-MBSi and terminal u to PWPN-MBSi is directly proportional；And with
Cochannel interference (in embodiment it is assumed that constant) and noise energy grade from neighboring community are inversely proportional；
In orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA) system
In system, frequency spectrum is generally divided into resource block (RB).Therefore we assume that can be R with the quantity of RB, the bandwidth of each RB is B；
In the data cached stage, PWPN-MBS is that each relaying j distributes αjR RBs is cached, due to optimal bandwidth allocation
It is impartial distribution, i.e., the reachable bandwidth of each terminal is equal to total bandwidth multiplied by distributing to the ratio of terminal divided by total number of terminals.
In retrieval data phase, the caching relaying will store in the buffer according to historical data solicited message is judged
Historical data information be sent to the terminal；
In the data retrieval stage, caching relaying individually services indoor terminal, data rate RjuIt is constant.Similarly, each room
The bandwidth of outer terminal can be written as total bandwidth divided by the sum of outdoor terminals.
In data retrieval stage indoor terminal by cache service, therefore the reception data volume in data cached stage should
Equal to the total amount of data that the data retrieval stage is sent to indoor terminal.
As shown in figure 3, a kind of substation wirelessly caches trunking method, it is also applied to PWPN-MBS, comprising:
S201PWPN-MBS receives the request of data of terminal described in the caching relay forwarding.
Specifically, the requested data of request of data include voltage value, the frequency of bus in smart grid scheduling system
The large number of equipment such as active power value, reactive power value, the current value of rate value, exchange line segment endpoint, transformer winding, breaker etc.
Historical data values, specific data type is not limited to above-mentioned data, depending on the concrete condition of user.
If after the OAM in the S202 PWPN-MBS determines that the request of data meets preset condition, sending control signal
It is relayed to the caching and executes caching mechanism, wherein the caching mechanism includes data cached stage and retrieval data phase.
Specifically, OAM continues to determine whether the request of data meets preset condition after executing caching mechanism, if
Preset condition is still met, then keeps the state for executing caching mechanism, if discovery is unsatisfactory for, is sent to PWPN-MBS and terminates letter
Number, the termination signal is sent to caching relaying by PWPN-MBS, and the caching relaying exits caching mechanism, while retaining caching
In data.
Wherein, in the control signal of the transmission of above-mentioned PWPN-MBS, bandwidth allocation ratio α, the bandwidth point are also carried
With ratioWherein, the RthFor the minimum data rate threshold value of each terminal, the T is total number of terminals,
The ciuFor the total bandwidth of the caching relaying.
Above-mentioned bandwidth allocation ratio α refers to the ratio of two parts of the bandwidth of PWPN-MBS, and a portion is to be used for
Data cached bandwidth, another part are the bandwidth for service terminal.Calculate SiFormula be It rewrite
It arrives The formula can simplify forNormal form, whereinFor its symmetric points, E determines its monotonicity, and It follows that Si[0,
1] monotonic increase on, therefore, under the premise of guaranteeing terminal service quality, when α reaches maximum value, whole system handling capacity SiIt will
Reach maximum value.
The PWPN-MBS determines the step of request of data meets preset condition, comprising: the OAM of the PWPN-MBS
It detects when having historical data solicited message in the request of data, can be calculated according to power business scenario parameters and use the caching
The handling capacity of relaying, if being greater than the handling capacity using tradition relaying using the handling capacity of caching relaying, it is determined that the data are asked
It asks and meets preset condition.
Specifically, PWPN-MBS determines the step of request of data meets preset condition, comprising:
Specifically, the PWPN-MBS was determined in the step of request of data meets preset condition, OAM is according to the electricity
Power business scenario parameter calculates the handling capacity using caching relaying, and target is to obtain the maximize handling capacity within a period
Si, handling capacity consists of three parts:
The summation of all terminal speeds when first part is data cached, second part be retrieval data when and PWPN-MBS
The summation of connected outdoor terminals rate, last part are to use the indoor terminal rate of caching relaying after retrieving data
Summation；
The handling capacity of tradition relaying is regarded as total bandwidth divided by total indoor terminal multiplied by achievable rate；
Achievable rate is calculated multiplied by the ratio for distributing to terminal divided by total number of terminals by total bandwidth；
OAM is compared by the counted handling capacity using caching relaying and using the handling capacity of tradition caching, if using
The handling capacity for caching relaying is big, then it is assumed that meet preset condition, it is on the contrary then think to be unsatisfactory for preset condition.
The power business scenario parameters include:
The distance between the PWPN-MBS and caching relaying, being averaged between the PWPN-MBS and outdoor terminals
Distance, the quantity of indoor terminal, the quantity of outdoor terminals.
Specifically, calculating SiUsed parameter includes the distance between the PWPN-MBS and the caching relaying dij,
Average distance between the PWPN-MBS and outdoor terminalsThe quantity of indoor terminalThe quantity T of outdoor terminalsi。
In the present embodiment, firstly, defining the bandwidth ratio that each relay distribution arrives is αj, it and indoor terminal quantity Tj
And it is relayed to the rate R of indoor terminaljkDirectly proportional and PWPN-MBS to the distance between relaying dijIt is inversely proportional.Therefore, no
With the α of relayingjIt can be represented asWherein cijAnd dijIt is directly proportional.
It can be expressed as in the bandwidth in data cached stage, each terminal (including indoor and outdoors)Wherein B is the number of RB, and W is the bandwidth of each RB；In retrieval data phase, due to interior
Independent service of the terminal by cache (Cache), therefore the bandwidth of each outdoor terminals can be expressed as
In addition, being transmitted since the data cached received data volume of stage cache is equal to retrieval data phase to indoor terminal
Data volume, therefore have αjBWcijt1=RjuTjt2, j=1,2 ..., N, u ∈ Tj, by the formula and αjOur available caching numbers
According to the time t in stage and retrieval data phase1And t2It is respectively
Our available calculating S as a result,iFormula be
The formula include three parts: first part be all terminal speeds of data cached stage and；Second part is
The sum for the outdoor terminals rate that retrieval data phase is connected with PWPN-MBS；Part III is that retrieval data phase is taken by caching
The sum of the indoor terminal rate of business.
The step of executing caching mechanism, comprising: if being retrieved according to the historical data solicited message less than corresponding caching
When data, the PWPN-MBS can obtain the corresponding data of the historical data solicited message and issue the caching relaying.
Specifically, it includes two stages, referred to as data cached stage and inspection that PWPN-MBS, which executes the step of caching mechanism,
Rope data phase；
In the data cached stage, the caching relaying is obtained from PWPN-MBS and is corresponded to according to historical data solicited message
Historical data, and in the buffer by the history data store, while the historical data is sent to the terminal；
In the data cached stage, indoor terminal is communicated by caching relaying with PWPN-MBS.Assuming that from PWPN-MBS to slow
The data rate for depositing relaying is Rij, being relayed to the data rate of indoor terminal from caching is Rju；Mark just as assessing a system
Standard is that it is how well the same under worst performance, and the reception data rate of indoor terminal is min (Rij,Rju)；In the present embodiment
In, since indoor communications can work in the emerging frequency band with enough resources, such as millimeter wave, it can be assumed that Rju>
Rij；Therefore, data rate of the receiving velocity of indoor terminal only between PWPN-MBS and relaying is related, i.e. Rij；
In the data cached stage, c can be expressed as by transmitting the accessible rate of dataiu.According to shannon formula, ciuIt can be with
With the logarithmic function of Signal to Interference plus Noise Ratio (Signal to Interference plus Noise Ratio, SINR)
It indicates；Wherein its channel gain between the transmission power of PWPN-MBSi and terminal u to PWPN-MBSi is directly proportional；And with
Cochannel interference (in embodiment it is assumed that constant) and noise energy grade from neighboring community are inversely proportional；
In orthogonal frequency division multiple access (Orthogonal Frequency Division Multiple Access, OFDMA) system
In system, frequency spectrum is generally divided into resource block (RB).Therefore we assume that can be R with the quantity of RB, the bandwidth of each RB is B；
In the data cached stage, PWPN-MBS is that each relaying j distributes αjR RBs is cached, due to optimal bandwidth allocation
It is impartial distribution, i.e., the reachable bandwidth of each terminal is equal to total bandwidth multiplied by distributing to the ratio of terminal divided by total number of terminals.
In retrieval data phase, the caching relaying will store in the buffer according to historical data solicited message is judged
Historical data information be sent to the terminal；
In the data retrieval stage, caching relaying individually services indoor terminal, data rate RjuIt is constant.Similarly, each room
The bandwidth of outer terminal can be written as total bandwidth divided by the sum of outdoor terminals.
In data retrieval stage indoor terminal by cache service, therefore the reception data volume in data cached stage should
Equal to the total amount of data that the data retrieval stage is sent to indoor terminal.
The bandwidth usage that the substation wirelessly caches trunking method when can reduce repetitive requests identical data, optimization
Link circuit resource distribution improves the terminal in substation to the access efficiency of smart grid scheduling system history data service, reduces
The flow load of PWPN-MBS, improves the handling capacity of system.
In addition, the present invention also provides a kind of substations wirelessly to cache relay system, the substation wirelessly caches relaying system
System using the caching relaying of method as described above, using the PWPN-MBS and terminal of such as above method, the caching relays,
PWPN-MBS and terminal wirelessly connect.
As shown in figure 4, interactive process of the above system in Application Example will be described in detail below, it is specific
Work step include:
S301 terminal send request of data to cache relaying.
Specifically, executing S302 if caching relaying receives the request of data.
S302 caches relay forwarding request of data to PWPN-MBS.
S303 PWPN-MBS judges whether request of data is historical data request.
Specifically, the OAM in PWPN-MBS judges whether request of data is historical data, then carried out down if historical data
One step, otherwise returns to S301.
S304 PWPN-MBS judges whether to execute caching mechanism.
Specifically, the OAM in PWPN-MBS judges whether to execute caching mechanism according to preset condition, OAM makes counted
It is compared with the handling capacity of caching relaying and using the handling capacity of tradition caching, if big using the handling capacity of caching relaying,
Think to meet preset condition, executes S305, it is on the contrary then think to be unsatisfactory for preset condition execution S301.
S305 PWPN-MBS is relayed to caching sends control signal.
Specifically, executing caching mechanism, and carry according to control signal if relaying caching receives the control signal
Bandwidth allocation ratio carry out bandwidth allocation.
Whether the historical data that S306 caching relaying judgement receives is the historical data cached.
If specifically, the historical data cached, then execute S307, otherwise execute S308.
S307 caching relaying sends the historical data cached.
S308 caching relaying requests uncached historical data to PWPN-MBS.
S309 PWPN-MBS returns to uncached historical data to caching relaying.
Specifically, caching relaying further includes cache device, for caching the uncached history number of PWPN-MBS return
According to the uncached historical data that caching relaying returns to PWPN-MBS caches, and is performed simultaneously S310.
S310 caching relaying sends historical data to terminal.
As shown in figure 5, above-described embodiment is presented below specifically judges process, the judgement process in implementation process
The step of include:
S401 OAM detects the request of data of all caching relay forwardings.
S402 OAM detects whether to receive historical data request.
If OAM detects that the request of data of relay forwarding for historical data request, executes S403, otherwise returns to S401.
S403 OAM acquires power business scenario parameters.
S404 judges whether be greater than traditional handling capacity using the handling capacity of caching relaying.
If more than traditional handling capacity, then S405 is executed, S401 is otherwise executed.
S405 OAM calculates optimum bandwidth distribution, and sends control signal to PWPN-MBS and caching relaying.
S406 executes caching mechanism, including data cached and retrieval data.
S407 terminates.
It is that the substation wirelessly caches the corresponding system of trunking method that a kind of substation, which wirelessly caches relay system,
The system comprises use the substation wirelessly to cache the caching relaying of trunking method and using to state during substation wirelessly caches
After the PWPN-MBS of method, therefore, its advantages are same.
It should be understood by those skilled in the art that, embodiments herein can provide as method, system or computer program
Product.Therefore, complete hardware embodiment, complete software embodiment or reality combining software and hardware aspects can be used in the application
Apply the form of example.Moreover, it wherein includes the computer of computer usable program code that the application, which can be used in one or more,
The computer program implemented in usable storage medium (including but not limited to magnetic disk storage, CD-ROM, optical memory etc.) produces
The form of product.
The application is referring to method, the process of equipment (system) and computer program product according to the embodiment of the present application
Figure and/or block diagram describe.It should be understood that every one stream in flowchart and/or the block diagram can be realized by computer program instructions
The combination of process and/or box in journey and/or box and flowchart and/or the block diagram.It can provide these computer programs
Instruct the processor of general purpose computer, special purpose computer, Embedded Processor or other programmable data processing devices to produce
A raw machine, so that being generated by the instruction that computer or the processor of other programmable data processing devices execute for real
The device for the function of being specified in present one or more flows of the flowchart and/or one or more blocks of the block diagram.
These computer program instructions, which may also be stored in, is able to guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works, so that it includes referring to that instruction stored in the computer readable memory, which generates,
Enable the manufacture of device, the command device realize in one box of one or more flows of the flowchart and/or block diagram or
The function of being specified in multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device, so that counting
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, thus in computer or
The instruction executed on other programmable devices is provided for realizing in one or more flows of the flowchart and/or block diagram one
The step of function of being specified in a box or multiple boxes.
The aforementioned description to specific exemplary embodiment of the invention is in order to illustrate and illustration purpose.These descriptions
It is not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to the above instruction, can much be changed
And variation.The purpose of selecting and describing the exemplary embodiment is that explaining specific principle of the invention and its actually answering
With so that those skilled in the art can be realized and utilize a variety of different exemplary implementation schemes of the invention and
Various chooses and changes.The scope of the present invention is intended to be limited by claims and its equivalents.
Claims (11)
1. a kind of substation wirelessly caches trunking method, which is characterized in that the described method includes:
The request of data that relay reception terminal is sent is cached, and the request of data is transmitted to electric power wireless private network macro base station
PWPN-MBS；
If described after the operation, management, maintenance OAM in the PWPN-MBS determine that the request of data meets preset condition
It caches the control signal that PWPN-MBS described in relay reception is sent and executes caching mechanism.
2. a kind of substation as described in claim 1 wirelessly caches trunking method, which is characterized in that taken in the control signal
With bandwidth allocation ratio α, the bandwidth allocation ratio be used for the caching relay execute caching mechanism when, distribute with it is described
The bandwidth of PWPN-MBS communication；The bandwidth allocation ratioWherein, the RthMost for each terminal
Small data rate threshold value, the T are total number of terminals, the ciuFor the total bandwidth of the caching relaying.
3. a kind of substation as described in claim 1 wirelessly caches trunking method, which is characterized in that the PWPN-MBS is determined
The step of request of data meets preset condition, comprising:
The OAM of the PWPN-MBS is detected when having historical data solicited message in the request of data, according to power business scene
Parameter calculates the handling capacity using the caching relaying, if being greater than handling up using tradition relaying using the handling capacity of caching relaying
Amount, it is determined that the request of data meets preset condition.
4. a kind of substation as claimed in claim 3 wirelessly caches trunking method, which is characterized in that the power business scene
Parameter includes at least one of following: the PWPN-MBS and the caching relaying the distance between, the PWPN-MBS and
Average distance between outdoor terminals, the quantity of indoor terminal, the quantity of outdoor terminals.
5. a kind of substation as claimed in claim 3 wirelessly caches trunking method, which is characterized in that the caching relaying executes
The step of caching mechanism, comprising:
Caching relaying according to historical data solicited message retrieval with the presence or absence of corresponding data cached, if it does,
Data cached terminal is sent to for described；If it does not, obtaining the historical data solicited message from the PWPN-MBS
Corresponding data are cached and are sent to terminal.
6. a kind of substation wirelessly caches trunking method, which is characterized in that the described method includes:
PWPN-MBS receives the request of data of caching relay forwarding terminal；
If after the OAM in the PWPN-MBS determines that the request of data meets preset condition, sending control signal to described slow
It deposits relaying and executes caching mechanism.
7. a kind of substation as claimed in claim 6 wirelessly caches trunking method, which is characterized in that taken in the control signal
With bandwidth allocation ratio α, the bandwidth allocation ratio be used for the caching relay execute caching mechanism when, distribute with it is described
The bandwidth of PWPN-MBS communication；The bandwidth allocation ratioWherein, the RthMost for each terminal
Small data rate threshold value, the T are total number of terminals, the ciuFor the total bandwidth of the caching relaying.
8. a kind of substation as claimed in claim 6 wirelessly caches trunking method, which is characterized in that the PWPN-MBS is determined
The step of request of data meets preset condition, comprising:
The OAM of the PWPN-MBS is detected when having historical data solicited message in the request of data, can be according to power business field
Scape parameter calculates the handling capacity using the caching relaying, if being greater than gulping down using tradition relaying using the handling capacity of caching relaying
The amount of spitting, it is determined that the request of data meets preset condition.
9. a kind of substation as claimed in claim 8 wirelessly caches trunking method, which is characterized in that the power business scene
Parameter includes at least one of following: the PWPN-MBS and the caching relaying the distance between, the PWPN-MBS and
Average distance between outdoor terminals, the quantity of indoor terminal, the quantity of outdoor terminals.
10. a kind of substation as claimed in claim 8 wirelessly caches trunking method, which is characterized in that if according to the history
Data request information retrieval less than it is corresponding data cached when, the PWPN-MBS can obtain the historical data solicited message pair
The data answered issue the caching relaying.
11. a kind of substation wirelessly caches relay system, which is characterized in that including using such as claim 1-5 the method
Caching relaying, using the PWPN-MBS and terminal of such as claim 6-10 the method, in the PWPN-MBS, the caching
It is wirelessly connected after with the terminal device.
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