CN105207696B - The broadband power line communication resource allocation methods and device of power information collection - Google Patents
The broadband power line communication resource allocation methods and device of power information collection Download PDFInfo
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Abstract
The invention provides a kind of broadband power line communication resource allocation methods of power information collection, power line channel characterisitic parameter including obtaining power information acquisition terminal, estimate subcarrier bit capacity, by subcarrier resource distribution gateway, according to minimum sub-carrier optimization criterion distribution terminal corresponding gateway, gateway transmits terminal power information data to affiliated terminal distribution sub-carrier resources and terminal according to the sub-carrier resources of distribution.Present invention also offers a kind of device of the application resource allocation methods, including power line channel state acquisition module, subcarrier bit capacity estimation block, subcarrier distribution gateway module, terminal distribution gateway module, gateway distribution terminal sub-carrier block and the power information data transmitting module being sequentially connected.The present invention optimizes resource allocation, overcomes influence of the noise to communication throughput, transmit power and Delay Service quality, improve the validity of communication due to considering channel gain of the power information acquisition terminal channel between different gateways.
Description
Technical field
Present invention relates particularly to the broadband power line communication resource allocation methods and device of a kind of power information collection.
Background technology
Broadband power line communication（Broadband Power Line Communication, BPLC）Technology is one kind with electricity
The line of force is the high-speed data communication technology of medium.For the distinctive noise of power line channel and fading environments at a high speed, reliably
Output transmission new technical barrier, OFDM（Orthogonal Frequency Division
Multiplexing, OFDM）Modulation technique has a variety of advantages, can build broadband power line communication OFDM（BPLC-
OFDM）Efficient communication of the system to realize electric power power information capturing service is supported.The broadband power line of power information collection leads to
Believe that ofdm system is that power line channel available frequency band is divided into the subcarrier that some sub-channels are transmitted as OFDM data, lead to
Cross to power information acquisition terminal and distribute sub-carrier resources, the corresponding bit stream of sub-carrier resources carrying power information data is real
Existing power information capturing service.
For the low pressure broadband power line communication network of traditional single gateway structure, power information acquisition terminal can only pass through list
One gateway realizes that power information data gather the transmission of main website to power information.Done when power line communication channel has time-varying noise
In the case of disturbing, it is bigger than normal and traffic delay length to there is transmit power in traditional single gateway resource allocation methods of BPLC-OFDM systems
Problem.
The content of the invention
An object of the present invention is to provide that a kind of transmit power is suitable, business delay time is short, suitable for double gateways
Power information collection broadband power line communication resource allocation methods.
The second object of the present invention is a kind of width for the power information collection for providing application communication resource allocation method
Band power line communication resource distribution device.
The broadband power line communication resource allocation methods for this power information collection that the present invention is provided, mainly include as follows
Step：
S1. the power line channel characterisitic parameter of power information acquisition terminal is obtained；
S2. subcarrier bit capacity is estimated；
S3. according to cumulative bit capacity maximal criterion by subcarrier resource distribution gateway；
The corresponding subcarrier bit capacity of all terminals is subjected to accumulation operations, cumulative bit is given by subcarrier resource distribution
The maximum corresponding gateway of capacity, gateway is randomly assigned if subcarrier bit capacity is equal by equiprobability；
S4. according to minimum sub-carrier optimization criterion distribution terminal corresponding gateway；
The estimation bit capacity of given each terminal transmission, is belonged to together under the restrictive condition of a gateway in distribution subcarrier,
The sub-carrier resources of terminal power information data bit are carried to each terminal distribution successively, until all terminal sub-carrier resources
Untill being assigned；
S5. gateway is to affiliated terminal distribution sub-carrier resources；
S6. terminal transmits terminal power information data according to the sub-carrier resources of distribution.
The power line channel characterisitic parameter of the step S1, including between number of sub carrier wave, terminal number, terminal and gateway
Power line channel unit power signal to noise ratio, power information terminal and gateway between power line channel signal to noise ratio difference ginseng
The power sub-carriers that several, each user distributes on each subcarrier can the istributes bit number upper limit, frequency band range, system total power, work(
Rate composes the upper limit and the requirement of terminal power information acquisition rate.
The estimation subcarrier bit capacity of the step S2 is to be estimated using constant power distribution method.
The distribution sub-carrier resources of the step S5 are to use multi-user's general power minimum optimization criteria.
The present invention also provides a kind of broadband power line communication of the power information collection of application communication resource allocation method
Resource allocation device, it is characterised in that including power line channel state acquisition module, subcarrier bit capacity estimation block, sub- load
Gateway module, terminal distribution gateway module, gateway distribution terminal sub-carrier block and power information data transmitting module are matched somebody with somebody in wavelength-division,
And be sequentially connected in series between each module；Power line channel state acquisition module is used for the power line letter for obtaining power information acquisition terminal
Road characterisitic parameter, subcarrier bit capacity estimation block is held using the power line channel characterisitic parameter estimation subcarrier bit obtained
Amount, subcarrier distribution gateway module is subcarrier resource distribution corresponding gateway, terminal point according to the subcarrier bit capacity of estimation
The corresponding gateway data of subcarrier resource distribution are utilized to be corresponding gateway distribution terminal, gateway distribution terminal with gateway module
Carrier module is used to be the terminal distribution sub-carrier resources in gateway, and power information data transmitting module utilizes allocated sub- load
Ripple resource transmits data.
Broadband power line communication resource allocation methods and apply this method that this power information that the present invention is provided is gathered
Device, due to considering channel gain of the power information acquisition terminal channel between different gateways, optimize power information collection
Broadband power line ofdm communication resource allocation, improves conventional method right under noise jamming using single gateway resource allocation factor
The influence of communication throughput, transmit power and Delay Service quality index, is advantageously implemented and uses electric power power information acquisition system
Communication efficient.
Brief description of the drawings
Fig. 1 is the structural representation of the communication system of the present invention.
Fig. 2 is method overall flow figure of the invention.
Fig. 3 is apparatus function module map of the invention.
Embodiment
It is as shown in Figure 1 the structural representation of communication system of the invention：Power information collection main website passes through network exchange
Machine and BPLC gateways 1, BPLC gateways 2 connect and obtain the electricity consumption data of terminal；N number of terminal in communication system passes through power line
Link, corresponding BPLC gateways 1 or BPLC gateways 2 are uploaded to by the way of electric line carrier communication by electricity consumption data.
The method overall flow figure of the present invention is illustrated in figure 2, method of the invention comprises the following steps：
S1. the power line channel characterisitic parameter of power information acquisition terminal is obtained；
Described power line channel characterisitic parameter, including number of sub carrier wave m, are designated as SubCSet={ SubCk, k=1 ... m；
Terminal number n, is designated as TSet={ j }, j=1 ... n；Gateway amount is 2, is designated as i；Power line channel list between terminal and gateway
Position PSNR power signal-to-noise ratio, is designated as SNRSetij={SNRij 1..., SNRij k..., SNRij m, wherein SNRij kCorrespondence power information terminal j
K-th of subcarrier unit power signal to noise ratio parameter between gateway i；Power line letter between power information terminal j and gateway i
The signal to noise ratio difference parameter in road, is designated as Γ Setij={Γij 1..., Γij k..., Γij m, wherein Γij kCorrespondence power information terminal
K-th of sub-carrier signal-noise ratio difference parameter between j and gateway i；The power sub-carriers that each user distributes on each subcarrier can
Istributes bit number upper limit rmax；Frequency band range, system total power Ptotal, the power spectrum upper limit and terminal power information acquisition rate will
Ask.
S2. subcarrier bit capacity is estimated；
Broadband power line communication ofdm system sends bit by subcarrier carrying, realizes data transfer；Subcarrier bit
Capacity is determined by channel factor and transmit power limiting factor.In this method, work(is sent using constant power method distribution subcarrier
Rate, subcarrier bit capacity is estimated according to below equation：
Wherein,For terminal j to gateway i transmit when subcarrier k on bit capacity；Total work can be used for system
Rate,NFor total number of sub-carriers；For subcarrier can the istributes bit number upper limit,For downward rounding operation.
Therefore with terminal j to gateway i transmit when subcarrier estimation bit capacity be represented by what each subcarrier can be carried
Bit number set。
S3. according to cumulative bit capacity maximal criterion by subcarrier resource distribution gateway；
The corresponding subcarrier bit capacity of all terminals is subjected to accumulation operations, cumulative bit is given by subcarrier resource distribution
The maximum corresponding gateway of capacity, gateway is randomly assigned if subcarrier bit capacity is equal by equiprobability；
For subcarrier k, cumulative capacity is calculated as follows：
When meeting following condition：
,
Subcarrier k distributes to gateway i（）, then the affiliated gateway information of subcarrier be represented by belonging to each subcarrier
The set of gateway（；Wherein represent subcarrier k distribution gateway serial numbers i；Cause
For；If i=1, subcarrier k distributes to the bit load that No. 1 gateway carries out subsequent step.
S4. according to minimum sub-carrier optimization criterion distribution terminal corresponding gateway；
Power information data are periodically transmitted power information main website by power information acquisition terminal by gateway, with terminal
Data information is the business characteristic of fixed value, is equivalent in each OFDM unit symbols of broadband power line ofdm communication system
The terminal bit number for needing subcarrier to carry also is fixed value.
Using minimum subcarrier criterion, the estimation bit capacity of each terminal transmission is given, one is belonged to together in distribution subcarrier
Under individual gateway restrictive condition, the sub-carrier resources of terminal power information data bit are carried to each terminal distribution successively, until
Untill all terminal sub-carrier resources are assigned.
If terminal j needs transmission power information data bit number to be designated as in an OFDM unit symbol（Unit
bit）, then the object function selection is that terminal j distribution number of sub carrier wave is, constraints 1 is terminal distribution subcarrier
Belong to same gateway, constraints 2 is more than for the bit number sum that carries of terminal distribution subcarrier（
For downward rounding operation, parameter）, constraints 3 is that each subcarrier only transmits same terminal data；Meet constraint
Under the conditions of object function requirement when number of sub carrier wave it is minimum.
S5. gateway is to affiliated terminal distribution sub-carrier resources；
According to multi-user's general power resource allocation minimum optimization criteria, each gateway is carried out to affiliated multiple terminals successively
Subcarrier resource distribution, sends under bit number requirement condition, resource allocation sends general power meeting terminal power information（Unit
For milliwatt, mW）It is minimum.
In this method, the object function selection sends general power for subcarrier, and constraints 1 is distributed for each terminal j
Subcarrier transmission bit number sum is more than, constraints 2 is that each subcarrier only transmits same terminal data bit；Meet
Subcarrier sends general power minimum when object function under constraints is required.
S6. terminal transmits terminal power information data according to the sub-carrier resources of distribution.
Power information data bit is sent to gateway by each terminal successively according to distribution sub-carrier resources, is finally reached and is used
Power information gathers main website, completes the power information data acquisition of terminal.
The broadband power for this power information collection that the present invention is provided is discussed in detail below by way of a specific example
Line communication resource allocation method.Control methods in the present embodiment uses typical single gateway broadband power line communication resource allocation
Method（Max-min algorithms）：
S1：Obtain the power line channel characterisitic parameter of power information acquisition terminal；
Using Typical Power Line channel circumstance parameter setting：Frequency band range is 0 ~ 10MHz, system total powerFor
10W, the power spectrum upper limit is -60dBm/kHz, sets total number of sub-carriersNFor 16, then=/N=10W/16=0.625W；Eventually
It is 4 to hold number, and terminal electricity consumption acquisition rate requires 10kbit/s,=4.038；Analogue system structure reference picture 2 is set；It is right
Gateway 1 is only included than algorithm.Each step of the inventive method is an OFDM symbol cycle（1ms）Interior completion, experiment is imitative
To performance indications and then analysis of uniting after true 100 OFDM symbol cycles, added with the concrete operations in the 16th OFDM symbol cycle
With explanation.
The characteristic of channel parameter acquiring such as power line channel signal to noise ratio of power information acquisition terminal, with preferred embodiment two
Individual gateway and the fractional unit PSNR power signal-to-noise ratio data instance of terminal 1, as shown in Table 1 and Table 2；
The sub-carrier signal-noise ratio parameter of table 1 (a) gateway 1- terminals 1
The sub-carrier signal-noise ratio parameter of table 1 (b) gateway 1- terminals 2
The sub-carrier signal-noise ratio parameter of table 1 (c) gateway 1- terminals 3
The sub-carrier signal-noise ratio parameter of table 1 (d) gateway 1- terminals 4
The sub-carrier signal-noise ratio parameter of table 2 (a) gateway 2- terminals 1
The sub-carrier signal-noise ratio parameter of table 2 (b) gateway 2- terminals 2
The sub-carrier signal-noise ratio parameter of table 2 (c) gateway 2- terminals 3
The sub-carrier signal-noise ratio parameter of table 2 (d) gateway 2- terminals 4
S2. subcarrier bit capacity is estimated；
Constant power distribution method estimate subcarrier bit capacity, below estimate gateway 1 to terminal 1 serial number 1 subcarrier
Subcarrier bit capacity：
The unit of unit power signal to noise ratio in Pjk=0.625W, table 1, table 2 is dB, and conversion success rate is 10lg（）=32.84, calculate=103.284,=4.038, rmax=10, therefore
=8, therefore table 3 can be obtained（a）The bit capacity of sub-carriers serial number 1 is 8；The result such as table 3 and table 4 can be obtained by that analogy.
The bit capacity of table 3 (a) gateway 1- terminals 1
The bit capacity of table 3 (b) gateway 1- terminals 2
The bit capacity of table 3 (c) gateway 1- terminals 3
The bit capacity of table 3 (d) gateway 1- terminals 4
The bit capacity of table 4 (a) gateway 2- terminals 1
The bit capacity of table 4 (b) gateway 2- terminals 2
The bit capacity of table 4 (c) gateway 2- terminals 3
The bit capacity of table 4 (d) gateway 2- terminals 4
S3. according to cumulative bit capacity maximal criterion by subcarrier resource distribution gateway；
Accumulation operations are carried out by 4 terminals corresponding subcarrier bit capacity to gateway 1 and gateway 2 successively, sub- load can be obtained
Ripple bit capacity is as shown in table 5.
The cumulative bit capacity of the gateway of table 5（Per bit）
Then give cumulative bit capacity maximum corresponding gateway subcarrier resource distribution, portion subcarriers distribution gateway knot
Fruit is as shown in table 6.
The distribution subcarrier distribution gateway of table 6
S4. according to minimum sub-carrier optimization criterion distribution terminal corresponding gateway；
Minimum sub-carrier optimization criterion distribution terminal corresponding gateway operating process and result are as follows：
By the transmission fixed number of bits for the OFDM symbol period that can be calculated terminal 1For 10
（10kbit/s*1ms=10bit）, according to three constraintss（Constraints 1 is that terminal distribution subcarrier belongs to same gateway,
Constraints 2 is more than for the bit number sum that carries of terminal distribution subcarrierFor 15 bits, particularly preferably example
In take 0.5, constraints 3 is that each subcarrier only transmits same terminal data）The sub-carrier resources result of distribution terminal 1, such as
Shown in table 7；Gateway distribution terminal sequence number is as shown in table 8.
The subcarrier of the terminal distribution of table 7
The gateway distribution terminal result of table 8
S5. gateway is to affiliated terminal distribution sub-carrier resources；
Multi-user's general power minimum optimization criteria gateway distribution terminal sub-carrier resources process and result are as follows；
Each gateway is carried out according to multi-user's general power resource allocation minimum optimization criteria to affiliated 4 terminals successively
Subcarrier resource distribution, according to two constraintss（Constraints 1 is that each terminal distribution subcarrier transmission bit number sum is big
InFor 15, constraints 2 is that each subcarrier only transmits same terminal data bit）, then in the 16th OFDM symbol
The subcarrier mean power result of 4 terminal distributions is as shown in table 9 in cycle.
The subcarrier mean power (mw) that table 9 is distributed
S6. terminal transmits terminal power information data according to the sub-carrier resources of distribution.
By above step, that is, complete the distribution of the broadband power line communication resource of the power information collection of double gateways
Journey.
In statistic property the result such as table 10 and table 11 in 100 OFDM symbol cycles of experiment simulation（Data are according to table 10
The value that corresponding data is averaged）It is shown.
The performance indications of two gateways of the inventive method of table 10
The inventive method performance indications of table 11 are contrasted
As can be seen here, compared with prior art, double gateway broadband power line communication resources of power information collection of the present invention
Distributor, it is considered to channel gain of the power information acquisition terminal channel between different gateways, optimizes power information collection wide
Band power line ofdm communication resource allocation.Power information is carried out using double gateway broadband power line ofdm communication resource allocation methods
Terminal data transmission, improves conventional method and uses single gateway resource allocation factor under noise jamming to communication throughput, hair
The influence of power and Delay Service quality index is sent, the communication efficient with electric power power information acquisition system is advantageously implemented.
It is illustrated in figure 3 the functional block diagram of apparatus of the present invention：Including power line channel state acquisition module, subcarrier ratio
Special volume calculation module, subcarrier distribution gateway module, terminal distribution gateway module, gateway distribution terminal sub-carrier block and use
It is sequentially connected in series between power information data transmitting module, and each module；Power line channel state acquisition module is used for acquisition telecommunications
The power line channel characterisitic parameter of acquisition terminal is ceased, subcarrier bit capacity estimation block utilizes the power line channel characteristic obtained
Parameter estimation subcarrier bit capacity, subcarrier distribution gateway module is sub-carrier resources according to the subcarrier bit capacity of estimation
Corresponding gateway is distributed, terminal distribution gateway module is distributed using the corresponding gateway data of subcarrier resource distribution for corresponding gateway
Terminal, gateway distribution terminal sub-carrier block is used for for the terminal distribution sub-carrier resources in gateway, the transmission of power information data
Module transmits data using allocated sub-carrier resources.
Claims (5)
1. a kind of broadband power line communication resource allocation methods of power information collection, mainly comprise the following steps：
S1. power line channel state acquisition module obtains the power line channel characterisitic parameter of power information acquisition terminal；
S2. subcarrier bit capacity estimation block estimates subcarrier bit capacity；
S3. subcarrier distribution gateway module according to cumulative bit capacity maximal criterion by subcarrier resource distribution gateway：
The corresponding subcarrier bit capacity of all terminals is subjected to accumulation operations, cumulative bit capacity is given by subcarrier resource distribution
Maximum corresponding gateway, gateway is randomly assigned if subcarrier bit capacity is equal by equiprobability；
For subcarrier k, cumulative capacity is calculated as follows：
WhereinFor terminal j to gateway i transmit when subcarrier k on bit capacity；
When meeting following condition：
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Subcarrier k distributes to gateway i, i ∈ { 1,2 }, then the affiliated gateway information of subcarrier is represented by the affiliated gateway of each subcarrier
Set subCGateSet={ i1,...,ik,...,im, wherein ikRepresent subcarrier k distribution gateway serial numbers i；Because i ∈
{1,2}；If i=1, subcarrier k distributes to the bit load that No. 1 gateway carries out subsequent step；
S4. terminal distribution gateway module is according to minimum sub-carrier optimization criterion distribution terminal corresponding gateway：
The estimation bit capacity of given each terminal transmission, is belonged to together under the restrictive condition of a gateway, successively in distribution subcarrier
The sub-carrier resources of terminal power information data bit are carried to each terminal distribution, until all terminal subcarrier resource distributions
Untill finishing；
S5. gateway uses multi-user's general power minimum optimization criteria to affiliated terminal distribution sub-carrier resources；
S6. terminal transmits terminal power information data according to the sub-carrier resources of distribution：Each terminal is according to distribution subcarrier money
Power information data bit is sent to gateway by source successively, finally reaches power information collection main website, complete terminal uses telecommunications
Cease data acquisition.
2. a kind of broadband power line communication resource allocation methods of power information collection according to claim 1, its feature
It is the power line channel characterisitic parameter of the step S1, including the electricity between number of sub carrier wave, terminal number, terminal and gateway
It is the signal to noise ratio difference parameter of power line channel between line of force channel unit power signal to noise ratio, power information terminal and gateway, each
The power sub-carriers that user distributes on each subcarrier can the istributes bit number upper limit, frequency band range, system total power, on power spectrum
Limit and the requirement of terminal power information acquisition rate.
3. a kind of broadband power line communication resource allocation methods of power information collection according to one of claim 1 or 2,
It is characterized in that the estimation subcarrier bit capacity of the step S2 is to be estimated using constant power distribution method.
4. the broadband power line communication resource allocation methods of the power information collection described in a kind of one of application claim 1 or 2
Special device, it is characterised in that including power line channel state acquisition module, subcarrier bit capacity estimation block, subcarrier
Gateway module, terminal distribution gateway module, gateway distribution terminal sub-carrier block and power information data transmitting module are distributed, and
It is sequentially connected in series between each module；Power line channel state acquisition module is used for the power line channel for obtaining power information acquisition terminal
Characterisitic parameter, subcarrier bit capacity estimation block is held using the power line channel characterisitic parameter estimation subcarrier bit obtained
Amount, subcarrier distribution gateway module is subcarrier resource distribution corresponding gateway, terminal point according to the subcarrier bit capacity of estimation
The corresponding gateway data of subcarrier resource distribution are utilized to be corresponding gateway distribution terminal, gateway distribution terminal with gateway module
Carrier module is used to be the terminal distribution sub-carrier resources in gateway, and power information data transmitting module utilizes allocated sub- load
Ripple resource transmits data.
5. a kind of special dress of the broadband power line communication resource allocation methods of the power information collection described in application claim 3
Put, it is characterised in that including power line channel state acquisition module, subcarrier bit capacity estimation block, subcarrier distribution gateway
Module, terminal distribution gateway module, gateway distribution terminal sub-carrier block and power information data transmitting module, and each module it
Between be sequentially connected in series；Power line channel state acquisition module is used for the power line channel characteristic ginseng for obtaining power information acquisition terminal
Number, subcarrier bit capacity estimation block utilizes the power line channel characterisitic parameter estimation subcarrier bit capacity obtained, sub- load
Wavelength-division is subcarrier resource distribution corresponding gateway, terminal distribution gateway mould according to the subcarrier bit capacity of estimation with gateway module
Block is corresponding gateway distribution terminal, gateway distribution terminal sub-carrier block using the corresponding gateway data of subcarrier resource distribution
For for the terminal distribution sub-carrier resources in gateway, power information data transmitting module to utilize allocated sub-carrier resources to pass
Send data.
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| CN110061913A (en) * | 2019-03-26 | 2019-07-26 | 华北电力大学 | A kind of electric power protection communication network planing method based on node resource degree |
| CN110429989B (en) * | 2019-07-22 | 2021-04-23 | 清华大学 | Interference suppression and coexistence method and device between communication systems |
| CN112165372A (en) * | 2020-08-12 | 2021-01-01 | 国网江西省电力有限公司经济技术研究院 | Power distribution MIMO power line communication transmission method |
| CN113192313B (en) * | 2021-04-30 | 2022-06-24 | 国家电网有限公司 | Information acquisition system for electric power metering |
| CN114221677B (en) * | 2021-11-25 | 2023-08-22 | 国网山东省电力公司营销服务中心(计量中心) | Power line carrier modulation system and method based on channel state self-adaptive adjustment |
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| CN202502579U (en) * | 2011-09-23 | 2012-10-24 | 王瑄 | Indoor intelligent display terminal |
| CN103619069A (en) * | 2013-12-09 | 2014-03-05 | 华北电力大学 | Broadband power line communication cross-layer resource allocation method with prior hybrid service emergency degree |
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