CN107317602A - Power line carrier communication data transmission method based on QoS service quality - Google Patents
Power line carrier communication data transmission method based on QoS service quality Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L45/00—Routing or path finding of packets in data switching networks
- H04L45/302—Route determination based on requested QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/24—Traffic characterised by specific attributes, e.g. priority or QoS
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/70—Admission control; Resource allocation
- H04L47/80—Actions related to the user profile or the type of traffic
- H04L47/805—QOS or priority aware
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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
- H04L67/60—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources
- H04L67/61—Scheduling or organising the servicing of application requests, e.g. requests for application data transmissions using the analysis and optimisation of the required network resources taking into account QoS or priority requirements
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Abstract
The present invention relates to a kind of power line carrier communication data transmission method based on QoS service quality, the transmission rate request of bottom communication node is collected including top mode, highest bit error rate requirement, bottom communication node coordinates top mode to perceive the subcarrier collection demand for obtaining node, judge whether to the distribution of bottom communication node bandwidth, the clear and definite real time node t easet ofasubcarriers of bottom communication node ofdm system, and lock the subcarrier collection with potential demand, set non real-time node subcarrier collection, top mode initially enters the bandwidth allocation link of real time node, subsequently into the bandwidth allocation link of non real-time node, top mode is that each bottom communication node generates bandwidth authorization message frame, bottom communication node feeds back after authorization message frame is received and starts upload data.The beneficial effects of the present invention are：While distributing upstream bandwidth and reach that each bottom layer node basic communication quality Q oS of guarantee is required, the utilization rate of uplink is improved.
Description
Technical field
The present invention relates to communication technical field, it particularly relates to which a kind of power line carrier based on QoS service quality is logical
Letter data transmission method.
Background technology
In the data transfer mode research of current power line carrier communication, the major design on OFDM bandwidth allocations stresses
In the management of uplink, the reason for causing is because uplink corresponding node relation in transmitting procedure is multiple spot to single-point
, often there are multiple node bandwidth on demand in transmission and bandwidth is not enough or the unreasonable wasting phenomenon of bandwidth allocation.Transmission
When signal be highly prone to disturb and need to consider that signal is transmitted to bandwidth using maximizing simultaneously, different bandwidth allocations can be passed
Defeated result and the quality of signal will be different.It is mainly the distribution of sub-carrier on OFDM bandwidth allocations, currently there is two
Individual bandwidth allocation research direction, one is bandwidth allocation towards single user；Another is the bandwidth allocation of facing multiple users.Its
The bandwidth allocation of middle facing multiple users can be divided into 3 major classes again.One class is to distribute plan so that overall transmission rate is optimal for basic object
Slightly realize；Another kind of is to transmit the optimal allocation strategy for basic object with overall signal minimum power to realize；Also a class is
The optimal allocation strategy for basic object of overall performance of BER is realized.
Three of the above strategy is traditional at present on the research of OFDM uplink bandwidths allocation strategy.Three kinds of strategy studys
The bandwidth allocation of many targetedly algorithms and computation model for optimizing overall uplink is all derived.But these three are calculated
Method is there is also certain limitation, i.e., when fully taking into account some specific optimization aims, but have ignored overall bandwidth distribution
Other demands, such as QoS service quality, the requirement of the height of the grade of service to bandwidth.
The problem of in correlation technique, effective solution is not yet proposed at present.
The content of the invention
For the above-mentioned technical problem in correlation technique, the present invention proposes that a kind of power line based on QoS service quality is carried
Wave communication data transmission method, can solve the problem that the deficiency in above-mentioned technology.
To realize above-mentioned technical purpose, the technical proposal of the invention is realized in this way：
A kind of power line carrier communication data transmission method based on QoS service quality, comprises the following steps：
Step 310：Top mode collects the transmission rate request of each bottom communication node, highest bit error rate requirement, bottom
Layer communication node coordinates the subcarrier collection demand of each node of top mode Intellisense acquisition, wherein the bottom communication node
Including real time node and non real-time node；
Step 320：Judge whether to the time that bandwidth allocation mandate is carried out to bottom communication node；
Step 330：When it is determined that to bottom communication node carry out bandwidth allocation mandate time when, bottom communication node
The clear and definite real time node t easet ofasubcarriers of ofdm system, and the subcarrier collection of the possible potential demand of real time node is locked, set non-reality
Time idea carrier set；
Step 340：Top mode initially enters the bandwidth allocation link of the sub-carrier band of real time node；
Step 350：Into the bandwidth allocation link of non real-time node sub-carrier band；
Step 360：Top mode is that each bottom communication node generates bandwidth authorization message frame and sent；
Step 370：Bottom communication node judges whether to receive authorization message frame；
Step 380：It is determined that when receiving the authorization message frame, bottom communication node feeding back receives mandate, and start to upload
Data；
Step 390：Bottom communication nodal information the data transfer ends, and the bandwidth of release busy, i.e. sub-carrier channels.Enter
One step, the step 350 specifically includes following steps：
Step 351：After top mode enters the subcarrier distribution link of real time node, judging the bandwidth of real time node needs
Ask, including required sub-carrier number, minimum transmission rate and the bit error rate etc. are required；
Step 352：Initialization counter parameter s1=0；
Step 353：Service priority highest node is selected from real time node, subcarrier is carried out and selects；
Step 354：Judge whether the subcarrier collection that now real time node subcarrier is concentrated distributes to bottom communication section enough
Point, is directly entered step 356, otherwise into step 355 if meeting；
Step 355：Judge that whether the subcarrier of now non real-time node division integrates as empty set, be to terminate, otherwise enter
Step 356；
Step 356：Into the t easet ofasubcarriers link for selecting non real-time node, the subcarriers in non real-time node are selected
Enter the subcarrier collection of real time node and distribute to real time node；
Step 357：The adaptive approach for turning to principle using signal gain maximum according to model analysis is preferential according to entirety
Subcarrier is chosen for the purpose of minimum power, after a real time node selects end, counter s1=s1+1：
Step 358：Judge whether above-mentioned s1 numerical value is equal to the number of overall real time node, be to terminate real time node
Bandwidth allocation link, otherwise return to step 353.
Further, the step 360 specifically includes following steps：
Step 361：After top mode enters the subcarrier distribution link of non real-time node, the non real-time node of bottom is judged
Bandwidth demand, including required sub-carrier number, minimum transmission rate and the bit error rate etc. require；
Step 362：Initialization counter s2=0；
Step 363：Service priority highest node is selected from non real-time node preferentially carry out subcarrier and select；
Step 364：It is preferential according to choosing non real-time subcarrier for the purpose of overall minimum power according to adaptive approach, and sentence
Whether disconnected non real time user subcarrier collection meets the demand of non real-time node, is then to carry out step 365, otherwise terminates；
Step 365：The adaptive approach for turning to principle using signal gain maximum according to model analysis is preferential according to entirety
Subcarrier is chosen for the purpose of minimum power, after a non real-time node selects end, counter s2=s2+1；
Step 366：Judge whether above-mentioned s2 numerical value is equal to the number of overall non real-time node, be to terminate, otherwise return
Return step 363.
Further, two class subcarrier collection have been divided by communication transmission needs in the step 330, wherein the reality locked
Time idea carrier set is K1, the non real-time subcarrier set integrates as K2, total subcarrier collection K=K1∪K2。
Further, in the step 330 lock real time node may potential demand subcarrier collection rely primarily on it is following
A few class parameters：The node set I of real time node1, the desired bandwidth BW of each real time nodeRe, i, i ∈ I1, each real time node mesh
Mark expects that the bit error rate isEach real time node i minimum sub-carrier number demand miAnd each real time node
Transimission power pi。
Further, non real-time node subcarrier collection is set in the step 330 and relies primarily on following a few class parameters：It is described
The node set of non real-time node is I2, nodes are NI2=num (I2), the expectation band of each non real-time node therein
Wide BWRe, i, i ∈ I2, each non real-time node destination expects that the bit error rate is
Further, the bandwidth allocation of the step 340 and step 350 includes：
Under light load conditions, the bandwidth of the bottom communication node gently loaded is according to the desired bandwidth BW of itselfRe, iEqual portions
Volume is distributed, a width of BW of band of distributioni, now BWi=BWRe, i, the remaining bandwidth produced by the bottom communication node i gently loaded is
BWE, i=BWi-BWRe, i；Or,
In the case of heavy duty, it is divided into the bandwidth allocation of non real-time node and the bandwidth allocation of real time node, wherein, non-
In the bandwidth allocation of real time node, if non real-time node is i, i ∈ I2, the non real-time node bandwidth demand is BWRe, i, numerical value
Upper BWRe, i＞ BWMax, i, now the bandwidth of self-demand is equal to the maximum bandwidth threshold value of actual distribution, i.e. BWi=BWMax, i=
BWFixed, i；In the bandwidth allocation of real time node, real time node is set as s, s ∈ I1, real-time node bandwidth demand is
BWRe, i, equally numerically BWRe, i＞ BWMax, i, the bandwidth allocation is then actual maximum bandwidth distribution BWFixed, iPlus additional allocation
Bandwidth gi, in circuit all subcarriers integrate in the remaining bandwidth that totally produces of the bottom communication node that gently loads as BWE, total,
Wherein
Further, it is logical according to each bottom in the light bandwidth allocation of bottom communication node for stating load
Believe the weight w of nodejTo divide the distribution of remaining bandwidth, wherein,
Further, the extra bandwidth that bottom communication node can not be met in the case of the heavy duty is：BWD, i=
BWRe, i-BWmax, now, the extra bandwidth that overall heavy duty bottom communication node can not be met is：
Beneficial effects of the present invention：With upstream bandwidth and reach guarantee each bottom layer node basic communication quality Q oS requirement
While, improve the utilization rate of uplink.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to institute in embodiment
The accompanying drawing needed to use is briefly described, it should be apparent that, drawings in the following description are only some implementations of the present invention
Example, for those of ordinary skill in the art, on the premise of not paying creative work, can also be obtained according to these accompanying drawings
Obtain other accompanying drawings.
Fig. 1 is that a kind of power line carrier communication data based on QoS service quality described according to embodiments of the present invention are passed
The top mode distribution bandwidth of transmission method receives the procedure chart of backward bottom layer node mandate；
Fig. 2 is that a kind of power line carrier communication data based on QoS service quality described according to embodiments of the present invention are passed
The bottom communication node subcarrier collection of transmission method divides schematic diagram；
Fig. 3 is that a kind of power line carrier communication data based on QoS service quality described according to embodiments of the present invention are passed
The data transfer flow figure of transmission method；
Fig. 4 is that a kind of power line carrier communication data based on QoS service quality described according to embodiments of the present invention are passed
The top mode of transmission method distributes the flow chart of real time node bandwidth；
Fig. 5 is that a kind of power line carrier communication data based on QoS service quality described according to embodiments of the present invention are passed
The top mode of transmission method distributes the flow chart of non real-time node bandwidth；
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, the every other embodiment that those of ordinary skill in the art are obtained belongs to what the present invention was protected
Scope.
As shown in Figure 1, 2, 3, described a kind of power line carrier based on QoS service quality according to embodiments of the present invention is led to
Letter data transmission method, comprises the following steps：
Step 310：Top mode collects the transmission rate request of each bottom communication node, highest bit error rate requirement, bottom
Layer communication node coordinates the subcarrier collection demand of each node of top mode Intellisense acquisition, wherein the bottom communication node
Including real time node and non real-time node；
Step 320：Judge whether to the time that bandwidth allocation mandate is carried out to bottom communication node；
Step 330：When it is determined that to bottom communication node carry out bandwidth allocation mandate time when, bottom communication node
The clear and definite real time node t easet ofasubcarriers of ofdm system, and the subcarrier collection of the possible potential demand of real time node is locked, set non-reality
Time idea carrier set；
Step 340：Top mode initially enters the bandwidth allocation link of the sub-carrier band of real time node；
Step 350：Into the bandwidth allocation link of non real-time node sub-carrier band；
Step 360：Top mode is that each bottom communication node generates bandwidth authorization message frame and sent；
Step 370：Bottom communication node judges whether to receive authorization message frame；
Step 380：It is determined that when receiving the authorization message frame, bottom communication node feeding back receives mandate, and start to upload
Data；
Step 390：Bottom communication nodal information the data transfer ends, and the bandwidth of release busy, i.e. sub-carrier channels.
As shown in figure 4, the step 350 specifically includes following steps：
Step 351：After top mode enters the subcarrier distribution link of real time node, judging the bandwidth of real time node needs
Ask, including required sub-carrier number, minimum transmission rate and the bit error rate etc. are required；
Step 352：Initialization counter parameter s1=0；
Step 353：Service priority highest node is selected from real time node, subcarrier is carried out and selects；
Step 354：Judge whether the subcarrier collection that now real time node subcarrier is concentrated distributes to bottom communication section enough
Point, is directly entered step 356, otherwise into step 355 if meeting；
Step 355：Judge that whether the subcarrier of now non real-time node division integrates as empty set, be to terminate, otherwise enter
Step 356；
Step 356：Into the t easet ofasubcarriers link for selecting non real-time node, the subcarriers in non real-time node are selected
Enter the subcarrier collection of real time node and distribute to real time node；
Step 357：The adaptive approach for turning to principle using signal gain maximum according to model analysis is preferential according to entirety
Subcarrier is chosen for the purpose of minimum power, after a real time node selects end, counter s1=s1+1：
Step 358：Judge whether above-mentioned s1 numerical value is equal to the number of overall real time node, be to terminate real time node
Bandwidth allocation link, otherwise return to step 353.
As shown in figure 5, the step 360 specifically includes following steps：
Step 361：After top mode enters the subcarrier distribution link of non real-time node, the non real-time node of bottom is judged
Bandwidth demand, including required sub-carrier number, minimum transmission rate and the bit error rate etc. require；
Step 362：Initialization counter s2=0；
Step 363：Service priority highest node is selected from non real-time node preferentially carry out subcarrier and select；
Step 364：It is preferential according to choosing non real-time subcarrier for the purpose of overall minimum power according to adaptive approach, and sentence
Whether disconnected non real time user subcarrier collection meets the demand of non real-time node, is then to carry out step 365, otherwise terminates；
Step 365：The adaptive approach for turning to principle using signal gain maximum according to model analysis is preferential according to entirety
Subcarrier is chosen for the purpose of minimum power, after a non real-time node selects end, counter s2=s2+1：
Step 366：Judge whether above-mentioned s2 numerical value is equal to the number of overall non real-time node, be to terminate, otherwise return
Return step 363.
Wherein, two class subcarrier collection have been divided by communication transmission needs in the step 330, wherein the real-time section locked
Idea carrier set is K1, the non real-time subcarrier set integrates as K2, total subcarrier collection K=K1∪K2。
The subcarrier collection that the possible potential demand of real time node is locked in the step 330 relies primarily on following a few class parameters：
The node set I of the real time node1, the desired bandwidth BW of each real time nodeRe, i, i ∈ I1, each real-time section
Point target expects that the bit error rate isEach real time node i minimum sub-carrier number demand miAnd it is each
The transimission power p of real time nodei。
Non real-time node subcarrier collection is set in the step 330 and relies primarily on following a few class parameters：The non real-time section
The node set of point is I2, nodes are NI2=num (I2), the desired bandwidth BW of each non real-time node thereinRe, i,
i∈I2, each non real-time node destination expects that the bit error rate is
The message frame that T and R in Fig. 1 represent the message frame of transmission and received respectively, the message frame is generally referred to
The data transmitted.T1 is labeled as authorizing frame to be sent by top mode in uplink bandwidth assigning process here, and R1 is represented
The mandate frame received；Similarly what T2 was represented is the acknowledgement frame of bottom layer node, and R2 represents the acknowledgement frame received.Now authorized
Journey is since top mode initiates to authorize the frame t1 moment untill bottom layer node sends the acknowledgement frame t2 moment；Confirmation process is from bottom
Node initiates the acknowledgement frame t2 moment and starts to send first message frame t3 moment to bottom layer node and terminate.
In one particular embodiment of the present invention, the bandwidth allocation of the step 340 and step 350 includes：
Under light load conditions, the bandwidth of the bottom communication node gently loaded is according to the desired bandwidth BW of itselfRe, iEqual portions
Volume is distributed, a width of BW of band of distributioni, now BWi=BWRe, i, the remaining bandwidth produced by the bottom communication node i gently loaded is
BWE, i=BWi-BWRe, i；Or,
In the case of heavy duty, it is divided into the bandwidth allocation of non real-time node and the bandwidth allocation of real time node, wherein, non-
In the bandwidth allocation of real time node, if non real-time node is i, i ∈ I2, the non real-time node bandwidth demand is BWRe, i, numerical value
Upper BWRe, i＞ BWMax, i, now the bandwidth of self-demand is equal to the maximum bandwidth threshold value of actual distribution, i.e. BWi=BWMax, i=
BWFixed, i；In the bandwidth allocation of real time node, real time node is set as s, s ∈ I1, real-time node bandwidth demand is
BWRe, i, equally numerically BWRe, i＞ BWMax, i, the bandwidth allocation is then actual maximum bandwidth distribution BWFixed, iPlus additional allocation
Bandwidth gi, in circuit all subcarriers integrate in the remaining bandwidth that totally produces of the bottom communication node that gently loads as BWE, total,
Wherein
In one particular embodiment of the present invention, in the bandwidth allocation of the bottom communication node gently loaded, press
According to the weight w of each bottom communication nodejTo divide the distribution of remaining bandwidth, wherein,
In one particular embodiment of the present invention, the volume that bottom communication node can not be met in the case of the heavy duty
It is a width of in addition：BWD, i=BWRe, i-BWmax, now, the extra bandwidth that overall heavy duty bottom communication node can not be met is：
Understand for convenience the present invention above-mentioned technical proposal, below by way of in specifically used mode to the present invention it is above-mentioned
Technical scheme is described in detail.
When specifically used, according to a kind of power line carrier communication data based on QoS service quality of the present invention
Transmission method, including top mode collect transmission rate request, the highest bit error rate requirement of bottom communication node, bottom communication section
Point coordinates top mode Intellisense to obtain the subcarrier collection demand of node, judges whether to bottom communication node bandwidth point
Match somebody with somebody, the clear and definite real time node t easet ofasubcarriers of bottom communication node ofdm system, and lock the son of the possible potential demand of real time node
Carrier set, sets non real-time node subcarrier collection, and top mode initially enters the bandwidth allocation link of real time node, subsequently into
The bandwidth allocation link of non real-time node, top mode is that each bottom communication node generates bandwidth authorization message frame simultaneously, bottom
Communication node feedback receives mandate, and starts to upload data.
In above-mentioned transmission means, we first have to clearly, and bottom communication node includes real time node and non real-time node,
Wherein, the business demand of non real-time node-node transmission is non-real-time service, and the business demand of real time node transmission is real time business.
Then, the detailed step for distributing real time node bandwidth to top mode is as follows, wherein entering real-time in top mode
Node subcarrier distribution link after, judge the bandwidth demand of real time node, including required sub-carrier number, minimum transmission rate with
And the bit error rate etc. is required, then, initialization counter parameter s1=0, and select from real time node service priority highest
Node, carry out subcarrier select, judge now real time node subcarrier concentrate subcarrier collection whether distribute to bottom enough
Communication node, in the case of enough distribution, judges that the subcarrier of now non real-time node division integrates whether as empty set, if not
Then enter the t easet ofasubcarriers link for selecting non real-time node for empty set, select the subcarrier in non real-time node and be included in real-time section
The subcarrier collection of point simultaneously distributes to real time node, wherein turning to the adaptive of principle using signal gain maximum according to model analysis
Method is preferential according to subcarrier is chosen for the purpose of overall minimum power, after a real time node selects end, counter s1=
s1+1；It is that then top mode distributes real-time bandwidth by judging whether above-mentioned s1 numerical value is equal to the number of overall real time node
Complete.
Top mode takes preferential distribution to the bandwidth of real time node, and top mode is carried out after being assigned and distributes non-reality
When node bandwidth, now, detailed step is, after top mode enters the subcarrier distribution link of non real-time node, judges bottom
The bandwidth demand of the non real-time node of layer, including required sub-carrier number, minimum transmission rate and the bit error rate etc. require, then, just
Beginningization counter s2=0, and from non real-time node select service priority highest node and preferentially carry out subcarrier and select,
It is preferential according to choosing non real-time subcarrier for the purpose of overall minimum power according to adaptive approach, and judge non real time user load
Whether ripple collection meets the demand of non real-time node, if it is, turning to principle using signal gain maximum according to model analysis
Adaptive approach is preferential according to subcarrier is chosen for the purpose of overall minimum power, after a non real-time node selects end, meter
Number device s2=s2+1, is that then top mode divides by judging whether above-mentioned s2 numerical value is equal to the number of overall non real-time node
Completed with real-time bandwidth.
Realize that, to the bandwidth allocation between uplink, bottom communication node passes through intelligence by top mode ofdm system
Energy cognition technology carrys out the requirement of the clear and definite maximum bandwidth demand, i.e. transmission rate and sub-carrier number of itself.Top mode exists simultaneously
Under overall minimum transmit power restraint condition, each bottom layer node bandwidth is distributed, the target finally realized is each bottom communication
Subcarrier selected by node can realize the combination of itself peak signal gain.Top mode is by receiving bottom layer node Intellisense
The information of acquisition：Signal gain that the maximum bandwidth demand of each bottom communication node, each subcarrier are brought, all bottoms lead to
Believe the minimum transmit power of node, the subcarrier combination of each bottom communication node.Bottom communication node is divided according to real time business
For two classes (real time node, non real-time node), the potential required t easet ofasubcarriers of real time node are locked, non real-time node
T easet ofasubcarriers are sorted out.It is last to divide to plan how each node distributes sub-carrier channels according to specific flow.This patent
Design final realize that benefit is to distribute upstream bandwidth and reach to ensure each bottom layer node basic communication quality Q oS requirements
Meanwhile, improve the utilization rate of uplink.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
God is with principle, and any modification, equivalent substitution and improvements made etc. should be included in the scope of the protection.
Claims (9)
1. a kind of power line carrier communication data transmission method based on QoS service quality, it is characterised in that including following step
Suddenly：
Step 310：Top mode collects the transmission rate request of each bottom communication node, highest bit error rate requirement, and bottom leads to
The subcarrier collection demand that node coordinates top mode Intellisense to obtain each node is believed, wherein the bottom communication node includes
Real time node and non real-time node；
Step 320：Judge whether to the time that bandwidth allocation mandate is carried out to bottom communication node；
Step 330：When it is determined that to bottom communication node carry out bandwidth allocation mandate time when, bottom communication node OFDM systems
Unite clear and definite real time node t easet ofasubcarriers, and lock real time node may potential demand subcarrier collection, set non real-time node
Subcarrier collection；
Step 340：Top mode initially enters the bandwidth allocation link of the sub-carrier band of real time node；
Step 350：Into the bandwidth allocation link of non real-time node sub-carrier band；
Step 360：Top mode is that each bottom communication node generates bandwidth authorization message frame and sent；
Step 370：Bottom communication node judges whether to receive authorization message frame；
Step 380：It is determined that when receiving the authorization message frame, bottom communication node feeding back receives mandate, and start to upload data；
Step 390：Bottom communication nodal information the data transfer ends, and the bandwidth of release busy, i.e. sub-carrier channels.
2. the power line carrier communication data transmission method according to claim 1 based on QoS service quality, its feature exists
In the step 350 specifically includes following steps：
Step 351：After top mode enters the subcarrier distribution link of real time node, the bandwidth demand of real time node is judged,
Including the requirement such as required sub-carrier number, minimum transmission rate and bit error rate；
Step 352：Initialization counter parameter s1=0；
Step 353：Service priority highest node is selected from real time node, subcarrier is carried out and selects；
Step 354：Judge whether the subcarrier collection that now real time node subcarrier is concentrated distributes to bottom communication node enough, such as
Fruit meets and is then directly entered step 356, otherwise into step 355；
Step 355：Judge that whether the subcarrier of now non real-time node division integrates as empty set, be to terminate, otherwise into step
356；
Step 356：Into the t easet ofasubcarriers link for selecting non real-time node, the subcarrier selected in non real-time node is included in reality
Shi Jiedian subcarrier collection simultaneously distributes to real time node；
Step 357：The adaptive approach for turning to principle using signal gain maximum according to model analysis is preferential according to overall minimum
Subcarrier is chosen for the purpose of power, after a real time node selects end, counter s1=s1+1；
Step 358：Judge whether above-mentioned s1 numerical value is equal to the number of overall real time node, be the bandwidth for terminating real time node
Link is distributed, otherwise return to step 353.
3. the power line carrier communication data transmission method according to claim 1 based on QoS service quality, its feature exists
In the step 360 specifically includes following steps：
Step 361：After top mode enters the subcarrier distribution link of non real-time node, the band of the non real-time node of bottom is judged
Wide demand, including required sub-carrier number, minimum transmission rate and the bit error rate etc. are required；
Step 362：Initialization counter s2=0；
Step 363：Service priority highest node is selected from non real-time node preferentially carry out subcarrier and select；
Step 364：It is preferential according to choosing non real-time subcarrier for the purpose of overall minimum power according to adaptive approach, and judge non-
Whether active user subcarrier collection meets the demand of non real-time node, is then to carry out step 365, otherwise terminates；
Step 365：The adaptive approach for turning to principle using signal gain maximum according to model analysis is preferential according to overall minimum
Subcarrier is chosen for the purpose of power, after a non real-time node selects end, counter s2=s2+1；
Step 366：Judge whether above-mentioned s2 numerical value is equal to the number of overall non real-time node, be to terminate, otherwise return to step
Rapid 363.
4. the power line carrier communication data transmission method according to claim 1 based on QoS service quality, its feature exists
In two class subcarrier collection having been divided by communication transmission needs in the step 330, wherein the real time node subcarrier collection locked
For K1, the non real-time subcarrier set integrates as K2, total subcarrier collection K=K1∪K2。
5. the power line carrier communication data transmission method according to claim 4 based on QoS service quality, its feature exists
In the subcarrier collection that the possible potential demand of real time node is locked in the step 330 relies primarily on following a few class parameters：The reality
Shi Jiedian node set I1, the desired bandwidth BW of each real time nodere,i,i∈I1, each real time node target
It is expected that the bit error rate isEach real time node i minimum sub-carrier number demand miAnd it is each real
Shi Jiedian transimission power pi。
6. the power line carrier communication data transmission method according to claim 5 based on QoS service quality, its feature exists
In setting non real-time node subcarrier collection in the step 330 and rely primarily on following a few class parameters：The section of the non real-time node
Point set is combined into I2, nodes are NI2=num (I2), the desired bandwidth BW of each non real-time node thereinre,i,i∈I2,
Each non real-time node destination expects that the bit error rate is
7. the power line carrier communication data transmission method according to claim 1 based on QoS service quality, its feature exists
In the bandwidth allocation of the step 340 and step 350 includes：
Under light load conditions, the bandwidth of the bottom communication node gently loaded is according to the desired bandwidth BW of itselfre,iEqual shares point
Match somebody with somebody, a width of BW of band of distributioni, now BWi=BWre,i, the remaining bandwidth produced by the bottom communication node i gently loaded is BWe,i
=BWi-BWre,i；Or,
In the case of heavy duty, it is divided into the bandwidth allocation of non real-time node and the bandwidth allocation of real time node, wherein, non real-time
In the bandwidth allocation of node, if non real-time node is i, i ∈ I2, the non real-time node bandwidth demand is BWre,i, numerically
BWre,i＞ BWmax,i, now the bandwidth of self-demand is equal to the maximum bandwidth threshold value of actual distribution, i.e. BWi=BWmax,i=
BWfixed,i；In the bandwidth allocation of real time node, real time node is set as s, s ∈ I1, real-time node bandwidth demand is
BWre,i, equally numerically BWre,i＞ BWmax,i, the bandwidth allocation is then actual maximum bandwidth distribution BWfixed,iPlus additional allocation
Bandwidth gi, in circuit all subcarriers integrate in the remaining bandwidth that totally produces of the bottom communication node that gently loads as BWe,total,
Wherein
8. the power line carrier communication data transmission method according to claim 7 based on QoS service quality, its feature exists
In in the bandwidth allocation of the bottom communication node gently loaded, according to the weight w of each bottom communication nodejCome
The distribution of remaining bandwidth is divided, wherein,
9. the power line carrier communication data transmission method according to claim 8 based on QoS service quality, its feature exists
In the extra bandwidth that bottom communication node can not be met in the case of the heavy duty is：BWd,i=BWre,i-BWmax, now,
The extra bandwidth that overall heavy duty bottom communication node can not be met is：
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