CN106506043A - Data transmission method, control device and equipment in a kind of PLC system - Google Patents
Data transmission method, control device and equipment in a kind of PLC system Download PDFInfo
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- CN106506043A CN106506043A CN201610973028.2A CN201610973028A CN106506043A CN 106506043 A CN106506043 A CN 106506043A CN 201610973028 A CN201610973028 A CN 201610973028A CN 106506043 A CN106506043 A CN 106506043A
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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
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
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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
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Abstract
The present invention relates to the data transmission method, control device and equipment in a kind of PLC system, belongs to broadband power carrier communication field.Data transmission method in the PLC system, first by central control node to system in transfer resource include that CSMA time slots and tdma slot etc. are distributed unitedly and planned.Secondly, every grade of node allocation result being sent in system, every grade of node can only take to be distributed to the transfer resource sub-slots of this grade and carries out data is activation, while every grade of node can receive the data on all transfer resource sub-slots；Data transmission method in a kind of PLC system that the present invention is provided, has carried out rational distribution according to business demand to transfer resource, improves transfer resource utilization ratio, reduces interference each other, improves the data transmission capabilities of whole PLC system.
Description
Technical field
The invention belongs to mobile internet of things field, particularly belongs to broadband power carrier communication, is related specifically to
Transfer resource using method in broadband power line carrier system.
Background technology
Bandwidth carrier communicates (referred to as：PLC) network is using low-voltage power line as telecommunication media, realizes low-voltage electricity user
Power information is converged, the communication network of transmission and interaction.According to the construction featuress of electric lines of force, the network topology of bandwidth carrier communication
Structure tree structure, as shown in Figure 1.The network topology structure be with central control node (referred to as：CCO centered on), to act on behalf of
Node is (referred to as：PCO) all end nodes are connected (referred to as：STA multitiered network).Node B1, B2 and B3 belong to first device；Section
Point C1, C2, C3, C4 belong to secondary equipment；Node D1, D2, D3, D4, D5, D6 belong to three-stage apparatus；Node E1, E2 belong to level Four
Equipment.Between figure interior joint, line represents presence route, can be normally carried out information exchange, require supplementation between two nodes
Illustrated is not connected with each other between node, it is also possible to carry out mutual information interaction.For example do not have between node B1 and node B2
There is line, but identify the data that node B1 sends, node B2 can also be received, and vice versa.
For each node Normal intercommunication in PLC system, in PLC Chinese specifications, two kinds of transmission are exactly defined
Resource, i.e. Carrier Sense Multiple Access are (referred to as：CSMA) and time division multiple access way (referred to as：TDMA), wherein in PLC system,
All nodes can competitive way using CSMA time slots transfer resource, central control node specify TDMA be used for transmit fixation
Business, but all of nodes sharing tdma slot.
For CSMA transfer resources, PLC system defines communication between each node and adopts OFDM (referred to as
OFDMA) mode, their shared identical frequency resources, and between each node in addition to selecting route and be identical, it is also possible to
Identical with other nodes, so when each node sends OFDMA data, not only destination node can be received, other nodes
Can also receive.If multiple nodes are required for sending data, then may interfere, so existing PLC Chinese specifications
The CSMA transfer resource occupation mode inefficiencies of proposition, and serious interference each other, leverage the number of PLC system
According to transmittability.
For TDMA transfer resources, as all nodes all share the TDMA transfer resources region, if there are two nodes
Need transmitting message data simultaneously, and tdma slot does not provide collision detection mechanism, exists and seriously interferes, and directly results in
Data-message transmission fails, so there is very big restriction in business procedure is carried out, transfer resource utilization ratio is very low.
Content of the invention
In view of this, it is an object of the invention to provide a kind of data transmission method in PLC system, for PLC system
The defect that planning transfer resource is present, has carried out rational distribution according to business demand to transfer resource, has improve transfer resource
Utilization ratio.
Another object of the present invention is to the data transfer controller and data transfer in a kind of PLC system of offer sets
Standby.
For reaching above-mentioned purpose, the present invention provides following technical scheme：
Transfer resource is divided into multiple sub-slots, and is distributed in system by the data transmission method in a kind of PLC system
Every grade of node, every grade of node takes to be distributed to the transfer resource sub-slots of this grade and carries out data is activation, while every grade of node can
Receive the data on all transfer resource sub-slots.
Further, after the transfer resource is distributed, central control node is by central beacon broadcast transfer resource distribution
As a result, after each agent node receives central beacon, transfer resource allocation result is broadcasted by agent beacon；
Agent node and end node reception are to central control node allocation of transmission resources result, record central control node point
The transfer resource sub-slots of the place classification with this node；
The resource information from central control node monitored in real time by agent node and end node, if central authorities' control section
Point has withdrawn transfer resource or has changed transfer resource planning, then each node is by real-time update, and when frame action.
Further, the transfer resource includes TDMA resources and the Carrier Sense Multiple Access side of TDMA Time Division Multiple Access mode
The CSMA resources of formula；
In resource allocation process, total CSMA slot lengths are divided into multiple CSMA sub-slots by central control node, per grade
CSMA sub-slots are taken, per grade of node can only carry out data is activation using the CSMA sub-slots of this grade, can receive institute
The data having on CSMA sub-slots；
Total tdma slot length is divided into multiple TDMA sub-slots by central control node, and needs to carry out data transmission
The fixed TDMA sub-slots of each node distribution one, the node can only send data on the TDMA sub-slots of distribution, can
Receive the data on all TDMA sub-slots.
Further, before being allocated, central control node needs to carry out business detection the transfer resource, if not examining
Service needed execution is measured, then only CSMA resources has been allocated；If there is service needed to execute, simultaneously to CSMA resources and
TDMA resources are allocated.
Further, node is then classified using this node place if necessary to transmission or forwarding service association message
TDMA sub-slots transfer resource carries out data is activation；If sending or forwarding network operation message, then using this node institute
Data is activation is carried out in the CSMA sub-slots transfer resource of classification；The node includes central control node, agent node and end
Node.
Further, the CSMA resources are allocated by the following method：
It is N that central control node counts per grade of nodes0, N1, N2, N3..., Nk；
Wherein, N0For all node total numbers below central control node, central node is not included；N1For first nodes and
All child node sums below one-level；N2For two-level node and less than two grades all child node sums；N3For three-level node and
All child node sums below three-level；NkFor all child node sums below k levels node and k levels, k is less than 15 natural numbers；
Distribute to central control node using CSMA sub-slots 0 length be total CSMA slot lengths N0/(N0+N1+N2+
N3+...+Nk)；Distribute to first nodes using 1 length of CSMA sub-slots be total CSMA slot lengths N1/(N0+N1+N2+N3
+...+Nk)；Distribute to two-level node using 2 length of CSMA sub-slots be total CSMA slot times length N2/(N0+N1+N2+
N3+...+Nk)；Push away successively and must give three-level, level Four ..., the CSMA sub-slots that k level nodes are used.
Further, during start networking, the CSMA resources are allocated by the following method：
When every grade of networking, it is assumed that this grade of nodes are identical with higher level, and without downstream site；
When first nodes networking, it is assumed that first nodes number is N1, then central control node is using CSMA sub-slots 0
Length be total CSMA slot lengths N1/(N1+N1)=1/2；First nodes using the length of CSMA sub-slots 0 be total
The N of CSMA slot lengths1/(N1+N1)=1/2；
When two-level node networking, it is assumed that first nodes number is N1, then two-level node number is N1, so central authorities' control
Node processed using CSMA sub-slots 0 length be total CSMA slot lengths 2N1/(2N1+2N1+N1)=2/5；First nodes make
1 length of CSMA sub-slots is the 2N of total CSMA slot lengths1/(2N1+2N1+N1)=2/5；The CSMA that two-level node is used
2 length of sub-slots is the N of total CSMA slot lengths1/(2N1+2N1+N1)=1/5；
When three-level node networking, it is assumed that first nodes number is N1, two-level node number is N2, then three-level node be
N2So central control node is total CSMA slot lengths (N using the length of CSMA sub-slots 01+2N2)/(2N1+7N2)；One
Level node using 1 length of CSMA sub-slots be total CSMA slot lengths (N1+2N2)/(2N1+7N2)；Two-level node is used
2 length of CSMA sub-slots is the 2N of total CSMA slot lengths2/(2N1+7N2)；Three-level node using 3 length of CSMA sub-slots be
The N of total CSMA slot lengths2/(2N1+7N2), push away successively and must give level Four ..., the CSMA sub-slots that k level nodes are used.
Further, the TDMA resources are allocated by the following method：
It is M that central control node count each node to need the number of carrying business1、M2、…、Ms(S values are less than or equal to
15), wherein, M1For the portfolio that node 1 is carried, M2For the portfolio ... that node 2 is carried, MsFor the portfolio that node s is carried.
Distribute to the M of the TDMA sub-slots 1 for total TDMA length of node 11/(M1+M2+..Ms)；Distribute to node 2
M of the TDMA sub-slots 2 for total TDMA length2/(M1+M2+..Ms)；It is total to push away successively and must distribute to the TDMA sub-slots s of node s
The M of TDMA lengths/(M1+M2+..Ms).
A kind of data transfer controller in PLC system, the data transfer controller are the central authorities' control in PLC system
Node processed, includes transfer resource distribute module in described device, for transfer resource is divided into multiple sub-slots, and distribute to
Every grade of node in system, and described device takes and distributes to the transfer resource sub-slots of oneself and carry out data is activation, while device
The data on all transfer resource sub-slots can be received.
Business detection module, for carrying out business detection, is transmitted resource allocation according to demand.Specially：The biography
Defeated resource includes the CSMA resources of the TDMA resources and Carrier Sense Multiple Access mode of TDMA Time Division Multiple Access mode；The transmission
Before being allocated, central control node needs to carry out business detection resource, if being not detected by service needed execution, only
CSMA resources are allocated；If there is service needed to execute, simultaneously CSMA resources and TDMA resources are allocated.
A kind of data transmission set in PLC system, the data transmission set be PLC system in agent node or
End node, includes resource information storage module in the equipment, distribute this node for recording central control node
Be located the transfer resource sub-slots being classified, and monitors the resource information from central control node in real time, if central authorities' control
Node processed has withdrawn transfer resource or has changed transfer resource planning, then will be real-time for information in resource information storage module
Update.
The beneficial effects of the present invention is：The present invention by the data transmission method in a kind of PLC system, control device and
Equipment, first by central control node to system in transfer resource include that CSMA time slots and tdma slot etc. carry out unifying point
Match somebody with somebody and plan.Secondly, every grade of node allocation result being sent in system, every grade of node can only take the biography for distributing to this grade
Defeated resource sub-slots carry out data is activation, while every grade of node can receive the data on all transfer resource sub-slots；This
Data transmission method in a kind of PLC system of bright offer, has carried out rational distribution according to business demand to transfer resource, has carried
High transfer resource utilization ratio, interference each other is reduced, improve the data transmission capabilities of whole PLC system.
Description of the drawings
In order that the purpose of the present invention, technical scheme and beneficial effect are clearer, the present invention provides drawings described below and carries out
Explanation：
Fig. 1 is wideband electronic carrier communication network topological diagram；
Fig. 2 is that transfer resource distributes and uses flow chart；
Fig. 3 uses schematic diagram for CSMA resource allocations；
Fig. 4 uses schematic diagram for TDMA MRPs；
Fig. 5 is PLC system topology diagram in embodiment.
Specific embodiment
Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described in detail.
Data transmission method in a kind of PLC system proposed by the present invention, the method are provided to transmission according to the demand of business
Source has carried out rational distribution, and nodes at different levels carry out data transmission according to the transfer resource for being distributed, specifically, central authorities' control
Transfer resource is divided into multiple sub-slots by node, and distributes to every grade of node in system, and every grade of node takes distributes to this level
Transfer resource sub-slots carry out data is activation, while every grade of node can receive the data on all transfer resource sub-slots.
In PLC system, transfer resource includes the TDMA resources and Carrier Sense Multiple Access mode of TDMA Time Division Multiple Access mode
CSMA resources.
In resource allocation process, total CSMA slot lengths are divided into multiple CSMA sub-slots by central control node, per grade
CSMA sub-slots are taken, per grade of node can only carry out data is activation using the CSMA sub-slots of this grade, can receive institute
The data having on CSMA sub-slots.
Total tdma slot length is divided into multiple TDMA sub-slots by central control node, and needs to carry out data transmission
The fixed TDMA sub-slots of each node distribution one, the node can only send data on the TDMA sub-slots of distribution, can
Receive the data on all TDMA sub-slots.
A kind of data transmission method in PLC system, as shown in Fig. 2 comprise the following steps that：
Step one：Central control node carries out business detection, if being not detected by service needed execution, only to CSMA
Resource is allocated；If there is service needed to execute, simultaneously CSMA resources and TDMA resources are allocated.
Step 2：Central control node is by central beacon broadcast CSMA resources and TDMA resource allocation results, each generation
After reason node receives central beacon, transfer resource (CSMA resources and TDMA resources) allocation result is broadcasted by agent beacon.
Step 3：Each node, including agent node and end node, receives the TDMA sub-slots of central control node distribution
Transfer resource, then record the TDMA sub-slots information, and record central control node distributes the place classification of this node
CSMA sub-slots transfer resources.
Step 4：The node of allocation of transmission resources, if necessary to transmission or forwarding service association message, then uses
TDMA sub-slots transfer resources, if transmission or forwarding network operation message, then the CSMA of the classification that is located using this node
Time slot is transmitted.
Step 5：Each node monitors the resource information from central control node in real time, if central authorities' control section
Point has withdrawn transfer resource or has changed transfer resource planning, then each node is by real-time update, and when frame action.
In PLC system, the using method of CSMA transfer resources is that total CSMA slot lengths are divided into multiple CSMA sub-slots,
One CSMA sub-slots of per grade of occupancy, per grade of node can only carry out data is activation using the CSMA sub-slots of this grade, but can
To receive the data on all CSMA sub-slots, as shown in Figure 3.
The size of CSMA sub-slots is the son node number that carried by transmission line determining, central control node counts per grade
Nodes, including this grade of interstitial content.It is assumed that total nodes N0；Below first nodes and one-level, all child node sums are N1
Individual node；Two-level node and less than two grades all child node sums are N2Individual node；Own below three-level node and three-level
Child node sum is N3Individual node, similar approach calculate per grade of total nodes N4, N5... N15.
So central control node can be the N of total CSMA slot lengths using 0 length of CSMA sub-slots0/(N0+N1+N2+
N3+...+N15)；1 length of CSMA sub-slots that first nodes can be used is the N of total CSMA slot times length1/(N0+N1+N2
+N3+...+N15)；2 length of CSMA sub-slots that two-level node can be used is the N of the time span of total CSMA time slots2/(N0+N1
+N2+N3+...+N15)；Successively similar approach can obtain three-level, level Four ... the CSMA slot lengths of ten Pyatyis.
During interstitial content is amounted to, central control node itself is disregarded.
During start networking, central control node and child node are communicated using CSMA time slots, but the stage
Central control node does not have complete routing iinformation, there is no per grade of interstitial content, and this kind of situation is by the following method entering
Row CSMA resource allocations.
When every grade of networking, it is assumed that this grade of nodes are identical with higher level, and without downstream site.
For example during networking, first nodes networking, then first nodes and central control node take whole CSMA
Time slot, so central control node is the 1/2 of total CSMA slot lengths using the length of CSMA sub-slots 0；First nodes are used
The length of CSMA sub-slots 1 is the 1/2 of total CSMA slot lengths.
When secondary groups net, if first nodes number is N1, then it is assumed that in the network, below one-level, all nodes are total
Number is N1, then total nodes N1+N1 below central control node；One-level and the following node total number of one-level：N1+N1；Two grades of sections
Point sum N1；So central control node using CSMA sub-slots 0 length be total CSMA slot lengths 2N1/(2N1+2N1+
N1)=2/5；1 length of CSMA sub-slots is total CSMA slot lengths (2N1)/(2N1+2N1+N1)=2/5, CSMA sub-slots 2 are grown
Degree is the N of total CSMA slot lengths1/(2N1+2N1+1N1)=1/5.
When three-level networking, it is assumed that first nodes number be N1, two-level node number be N2, then amount to central control node with
Total nodes down：N1+N2+N2=N1+2N2；One-level and the following node total number of one-level：N1+2N2；Two grades and two grades with lower node
Sum：2N2；Three-level and following node total number N of three-level2.So central control node is total using 0 length of CSMA sub-slots
(the N of CSMA slot lengths1+2N2)/(N1+2N2+N1+2N2+2N2+N2)=(N1+2N2)/(2N1+7N2)；1 length of CSMA sub-slots
It is total CSMA slot lengths (N1+2N2)/(2N1+7N2), then 2 length of CSMA sub-slots is total CSMA slot lengths (2N2)/
(2N1+7N2), then 3 length of CSMA sub-slots is the N of total CSMA slot lengths2/(2N1+7N2), the like can obtain at different levels
When networking, every grade of CSMA sub-slots account for the ratio in CSMA time slots.
Tdma slot transfer resource, its occupation mode are that total tdma slot length is divided into multiple TDMA sub-slots, will be
The TDMA sub-slots for needing each node distribution one for carrying out data transmission fixed, the node can only be in the TDMA period of the day from 11 p.m. to 1 a.m of distribution
Data are sent in gap, but can receive the data on all TDMA sub-slots.
TDMA resources are allocated by the following method：
TDMA sub-slots length is determined that by node bearer traffic central control node is in planning business procedure
When, counting each node needs the number of carrying business, then carries out the division of TDMA sub-slots length.Such as central authorities' control section
Point initiation business 1, business 2 ... business N, central control node plan the node that each business is related to according to route information table,
If node 1 needs to process or forwards 1 business, then portfolio is defined as 1.It is then industry to process or forward two business
Business amount is 2, and by that analogy, the maximum portfolio of each node is N.In statistic processess, the traffic volume measurement result of each node is false
It is set to M1、M2、Ms(S values be less than or equal to 15), then each node distribution to TDMA sub-slots length scales be total TDMA when
The M of gap length1/(M1+M2+..Ms)、M2/(M1+M2+..Ms)、...Ms/(M1+M2+..Ms).
In tdma slot planning process, as shown in figure 4, can plan that multiple business are passed due to central control node simultaneously
Defeated resource, so with the increase of business number, then the node being related to is also more next more, may result in each TDMA sub-slots
Too short, it is impossible to transmit a complete message data, then central control node will reduce business number in synchronization, reach
Each TDMA sub-slots of distribution can carry the transmission of a message.
Data transfer controller in a kind of PLC system that the present invention is provided, the data transfer controller are PLC systems
Central control node in system, includes transfer resource distribute module in device, for transfer resource is divided into multiple sub-slots,
And every grade of node in system is distributed to, and device occupancy is distributed to the transfer resource sub-slots of oneself and carries out data is activation, while
Device can receive the data on all transfer resource sub-slots；Business detection module, for carrying out business detection, according to demand
It is transmitted resource allocation.
A kind of data transmission set in PLC system, data transmission set are the agent node in PLC system or end segment
Point, includes resource information storage module in the equipment, distribute the place of this node for recording central control node
The transfer resource sub-slots of classification, and monitor the resource information from central control node in real time, if central authorities' control section
Point has withdrawn transfer resource or has changed transfer resource planning, then by information in resource information storage module in real time more
Newly.
Embodiment：
In order to concrete application method of the invention in actual PLC system is described, first just using the PLC of Fig. 5 topological structure
Network is illustrating networking process.
In the topological structure of Fig. 5, PLC network is divided into three-level, and node A therein is central control node；First nodes
It is node B1, node B2 and node B3 compositions；Two-level node is node C1, node C2, node C3, node C4 compositions；Three-level section
Point is node D1 and node D2 networkings.It route between solid line node between node, can carries out between broken line representation node
Information exchange, but the route that whether selectes.
To describe in terms of two below, the topological structure Route establishment of electricity in start, next to that central control node is complete
Into the flow process that once checks meter.
Introducing first and how upper electric initial route setup process of starting shooting being completed using the invention, detailed process is as follows：
Step one：On central control node after electricity, transfer resource is divided into two parts by central control node, and one is
Beacon slot, another region is then CSMA time slots, and central control node carries transfer resource distribution information in
In the beacon of centre, broadcasted in central beacon by central control node.
Step 2：According to the topological structure of Fig. 5, the central beacon of central control node broadcast will be by node B1, node B2
Listen to node B3, and parse the central beacon content of central control node, obtained the letter of transfer resource CSMA time slots
Breath, central control node and node B1, node B2 and node B3 share this CSMA time slot.The node of central beacon is received, will
The association request message of oneself is sent on CSMA time slots using competitive way.Central control node is received from node B1, section
The association request message of point B2 and node B3, then send association request respectively and confirm node B1, node B2 and node B3.
Step 3：What central control node completed node B1, node B2 and node B3 enters network process (association request mistake
Journey), central control node plans CSMA time slots and beacon slot again.Wherein, CSMA time slots are divided into three CSMA sub-slots,
CSMA sub-slots 0 are used for central control node and send message；CSMA sub-slots 1 are used for the transmission message of first nodes；During CSMA
Gap 2 reports message request for new node.Meanwhile, central control node will be found for node B1, node B2 and node B3 distribution
Beacon transmissions resource, the transfer resource that central control node is redistributed will be broadcasted in central beacon, node B1, node B2 and
After node B3 receives central beacon, transfer resource distribution information is preserved.Wherein, the sending out as first nodes of CSMA sub-slots 1
The transfer resource of data is sent, then the resource information in central beacon is being found to forward on beacon.
Further remark additionally, in this step, when CSMA sub-slots are calculated, it is unclear that two-level node number, institute
With when calculating, it is assumed that first nodes are identical with two-level node number, and without three-level node, then in central authorities' control section
Point using CSMA sub-slots 0 length be total CSMA length 6/ (6+6+3)=6/15；The length of CSMA sub-slots 1 is CSMA
6/ (6+6+3)=6/15, CSMA sub-slots, 2 length of total length is 3/ (6+6+3)=3/15 of CSMA total lengths.
Step 4:Node B1, node B2 and the discovery beacon of node B2 broadcast, then according to Fig. 5 topological structure, node
C1, node C2 and node C3 can receive the discovery beacon of node B1；Node C3 and node C4 can receive the discovery of node B2
Beacon.Two-level node C1, node C2, node C3 and node C4 are by resource information, the wherein transfer resource of CSMA sub-slots 2
Data are sent as two-level node to use.
Node C1, node C2, node C3 and node C4, according to the signal quality choosing of the discovery beacon for receiving first nodes
Select as oneself locum's node, such as node C3 have received the discovery beacon from node B1 and node B2, according to signal
Quality, node C3 prioritizing selection node B1 are the locum's node of oneself.
Node C1, node C2, node C3 and node C4 will be sent using competitive way on 2 transfer resource of CSMA sub-slots
The association request message of oneself, each node is in association request message, it is necessary to indicate the locum's node of oneself.Node
B1, node B2, node B3 receive the association request message from two-level node, if indicating in association request message that this section point is
Locum's node of association request message, then first nodes will pass using competitive way on the transfer resource of CSMA sub-slots
Connection request message is forwarded to upper level, that is, be forwarded to central control node.
Step 5：Central control node is received from the association request message for newly increasing node, then send association request true
Message is recognized to node is newly increased, carry the node identification for newly increasing node, and newly-increased supernumerary segment in association request confirmation message
The agent node mark of point.In the example it is assumed that the association request message that node C3 sends, then confirm in association request
In, include for node C3 distribution node identification (referred to as：TEI), and agent node B1 node identification.Central authorities' control section
Point sends association request confirmation message in one-level CSMA sub-slots, and node B1, node B2 and node B3 can receive the pass
Connection request message data, but only node B1 is the agent node of node C3, so only node B1 forwards the association request
Message.Same principle, completes the association request process of node C1, node C2 and node C4.
Step 6：After central control node completes the association request of two-level node, beacon transmissions money is redistributed again
Source and CSMA areas transfer resource.In beacon transmissions resource, it is node B1 and node B2 assignment agent beacon transmissions resources, due to
Node B3 does not have child node, so not distributing agent beacon resource.Central control node for central beacon and agent beacon and
It was found that the transfer resource of beacon distribution, does not overlap in time, do not share, exclusive mode is used.On CSMA transfer resources, will
CSMA time slots are divided into four time slots, and CSMA sub-slots 0 are used for central control node, and CSMA sub-slots 1 are used for first nodes
Use, CSMA sub-slots 2 are used for two-level node, CSMA sub-slots 3 are used for newly increasing node use.
Further remark additionally, in this step, clearly, and nodes are 3 to central control node, two-level node
Number is 4, then assume that three-level nodes are 4, and do not have 5 grades of nodes, then can calculate 0 length of CSMA sub-slots for total CSMA
11/ (11+11+8+4)=11/34, CSMA sub-slots, 1 length of slot length be CSMA total lengths 11/ (11+11+8+4)=
It is CSMA that 11/34, CSMA sub-slots, 2 length is 8/ (11+11+8+4)=8/34, CSMA sub-slots, 3 length of CSMA total lengths
4/ (11+11+8+4)=4/34 of total length.
Again the transfer resource that plans will broadcast each first nodes on the central beacon of central control node, i.e. the reality
Apply after the node B1 in example, node B2 and node B3 receive central beacon, delete the CSMA resource informations of original record, preserve
New CSMA resource informations, and using CSMA sub-slots 2 as the transfer resource for oneself sending data.If in central beacon middle finger
The fixed node is agent node, then the upper broadcast agent beacon of the agent beacon transmission that the node is specified, in carrying in agent beacon
The transfer resource distribution information that centre beacon is carried.Node C1, node C1, node C3 and node C4 receive from superior node B1 and
The agent beacon of node B2.
If central control node requesting node C1, node C2, node C3 and node C4 send finds beacon, then node
D1 and node D2 can receive the discovery beacon from node C3 and node C4, then node D1 and node D2 will be preserved and be found in beacon
Transfer resource, and set CSMA sub-slots 3 as three-level node send data transfer resource.
Then according to step 5 identical processing mode, the association request of node D1 and node D2 is completed.
By that analogy, the association request process of all nodes is completed using same way central control node, that is, complete Fig. 5
The group network process of topological structure.
Presented hereinbefore how to complete PLC system initial group network process using the present invention, be described below the present invention copy in electric power
Application during table.
In order to handling process is described more clearly, in FIG. 5, it is assumed that central control node is in node C2, node C3 and section
Point D1 carries out meter-reading function.It is as follows that flow graph is then specifically processed：
Step one：Each node processing task is counted, and needs to send data volume, it is 1, section that node A is 3, node C2
It is that 2, node B2 is 3 that point D1 is 1, node C3.
Step 2：Central control node be node A distribution tdma slot length be total tdma slot total length 3/ (3+
3+2+1+1)=3/10, it is assumed that for TDMA sub-slots 1；TDMA sub-slots length for node B2 distribution is total tdma slot length
3/ (3+3+2+1+1)=3/10, it is assumed that for TDMA sub-slots 2；TDMA sub-slots length for node C2 distribution is total TDMA
1/ (3+3+2+1+1)=1/10 of slot length, it is assumed that for TDMA sub-slots 3；TDMA sub-slots length for node D1 distribution
It is 1/ (3+3+2+1+1)=1/10 of total tdma slot length, it is assumed that for TDMA sub-slots 4；TDMA for node C3 distribution
Slot length is 2/ (3+3+2+1+1)=2/10 of total tdma slot length, it is assumed that for TDMA sub-slots 5.
Table 1：TDMA sub-slots allocation tables
Step 3：Each node calculated according to portfolio is occupied central control node the ratio of total TDMA, is calculated
The start and end time of each tdma slot, and broadcasted in central beacon, node B1 will be in agency after receiving
TDMA resource allocation parameters, node C3 are forwarded also to forward TDMA moneys in oneself agent beacon after receiving agent beacon in beacon
Source allocation of parameters.Each node receives central beacon or the transfer resource TDMA allocation of parameters in agent beacon, will be stored in
In the node of oneself.Each node is by interval transmission packet (the business reports of TDMA that central control node is oneself distribution
Text).
Step 4：According to mission requirements, central control node sends on TDMA sub-slots 1 respectively and checks meter message to node
C2, node C3 and node D1, node B2 will be forwarded on TDMA sub-slots 2, and node C3 forwards section on TDMA sub-slots 5
The message of checking meter of point D1.The node identification of node C2, node C3 and node D1 is included in each message (referred to as：TEI
Value).
Step 5：Node C2, node C3 and node D1 receive the message of checking meter from central control node, respectively in distribution
TDMA sub-slots on send and check meter result message.Specifically, node C2 sends service message on TDMA sub-slots 3；Section
Point C3 sends service message on TDMA sub-slots 3；Node D1 sends service message on TDMA sub-slots 4.
In routing procedure, the message of node C3 forward node D1 on TDMA sub-slots 3；Node B2 is in TDMA sub-slots
Forward on 2 from node A, node C1, node C3 message.
Step 6：Central control node after the task of checking meter for completing node C2, node C3 or node D1, again
Adjustment TDMA sub-slots distribution, and broadcast adjustment tdma slot parameter in central beacon immediately.In this embodiment, central authorities
Control node carries out node C2, node C3 and node D1 meter-reading functions simultaneously, as long as completing the task of checking meter of certain node, then
Central control node thinks that portfolio has occurred and that change, then need TDMA sub-slots parameter again.
Finally illustrate, preferred embodiment above is only unrestricted in order to technical scheme to be described, although logical
Cross above preferred embodiment to be described in detail the present invention, it is to be understood by those skilled in the art that can be
In form and various changes are made to which in details, without departing from claims of the present invention limited range.
Claims (10)
1. the data transmission method in a kind of PLC system, it is characterised in that：Transfer resource is divided into multiple sub-slots, and is distributed
To every grade of node in system, every grade of node takes to be distributed to the transfer resource sub-slots of this grade and carries out data is activation, while per
Level node can receive the data on all transfer resource sub-slots.
2. the data transmission method in a kind of PLC system according to claim 1, it is characterised in that：The transfer resource
After distributing, central control node receives central letter by central beacon broadcast transfer resource allocation result, each agent node
After mark, transfer resource allocation result is broadcasted by agent beacon；
Agent node and end node reception are to central control node allocation of transmission resources result, while recording central control node point
The transfer resource sub-slots of the place classification with this node；
The resource information from central control node monitored in real time by agent node and end node, if central control node is
Through withdrawing transfer resource or changing transfer resource planning, then each node is by real-time update.
3. the data transmission method in a kind of PLC system according to claim 1, it is characterised in that：The transfer resource
CSMA resources including the TDMA resources and Carrier Sense Multiple Access mode of TDMA Time Division Multiple Access mode；
In resource allocation process, total CSMA slot lengths are divided into multiple CSMA sub-slots, per grade of occupancy by central control node
One CSMA sub-slots, per grade of node can only carry out data is activation using the CSMA sub-slots of this grade, can receive all
Data on CSMA sub-slots；
Total tdma slot length is divided into multiple TDMA sub-slots by central control node, and for needing each for carrying out data transmission
The fixed TDMA sub-slots of node distribution one, the node can only send data on the TDMA sub-slots of distribution, can receive
Data on all TDMA sub-slots.
4. the data transmission method in a kind of PLC system according to claim 3, it is characterised in that：The transfer resource
Before being allocated, central control node needs to carry out business detection, if being not detected by service needed execution, only right
CSMA resources are allocated；If there is service needed to execute, simultaneously CSMA resources and TDMA resources are allocated.
5. the data transmission method in a kind of PLC system according to claim 3 or 4, it is characterised in that：If node is needed
Send or forwarding service association message, then data are carried out using the TDMA sub-slots transfer resource of classification that this node is located
Send；If sending or forwarding network operation message, then entered using the CSMA sub-slots transfer resources of classification that this node is located
Row data is activation；The node includes central control node, agent node and end node.
6. the data transmission method in a kind of PLC system according to claim 3, it is characterised in that：The CSMA resources
It is allocated by the following method：
It is N that central control node counts per grade of nodes0, N1, N2, N3..., Nk；
Wherein, N0For all node total numbers below central control node, central node is not included；N1For first nodes and one-level
All child nodes are total below；N2For two-level node and less than two grades all child node sums；N3For three-level node and three
The following all child node sums of level；NkFor all child node sums below k levels node and k levels, k is less than 15 natural numbers；
Distribute to central control node using CSMA sub-slots 0 length be total CSMA slot lengths N0/(N0+N1+N2+N3
+...+Nk)；Distribute to first nodes using 1 length of CSMA sub-slots be total CSMA slot lengths N1/(N0+N1+N2+N3
+...+Nk)；Distribute to two-level node using 2 length of CSMA sub-slots be total CSMA slot times length N2/(N0+N1+N2+
N3+...+Nk)；Push away successively and must give three-level, level Four ..., the CSMA sub-slots that k level nodes are used.
7. the data transmission method in a kind of PLC system according to claim 3, it is characterised in that：In start networking
Cheng Zhong, the CSMA resources are allocated by the following method：
When every grade of networking, it is assumed that this grade of nodes are identical with higher level, and without downstream site；
When first nodes networking, it is assumed that first nodes number is N1, then central control node using CSMA sub-slots 0 length
Degree is the N of total CSMA slot lengths1/(N1+N1)=1/2；First nodes using the length of CSMA sub-slots 0 be total CSMA when
The N of gap length1/(N1+N1)=1/2；
When two-level node networking, it is assumed that first nodes number is N1, then two-level node number is N1, so central authorities' control section
Point using CSMA sub-slots 0 length be total CSMA slot lengths 2N1/(2N1+2N1+N1)=2/5；First nodes are used
1 length of CSMA sub-slots is the 2N of total CSMA slot lengths1/(2N1+2N1+N1)=2/5；The CSMA period of the day from 11 p.m. to 1 a.m that two-level node is used
2 length of gap is the N of total CSMA slot lengths1/(2N1+2N1+N1)=1/5；
When three-level node networking, it is assumed that first nodes number is N1, two-level node number is N2, then three-level node is N2Institute
The use of the length of CSMA sub-slots 0 is total CSMA slot lengths (N with central control node1+2N2)/(2N1+7N2)；One-level section
1 length of CSMA sub-slots that point is used is total CSMA slot lengths (N1+2N2)/(2N1+7N2)；The CSMA that two-level node is used
2 length of sub-slots is the 2N of total CSMA slot lengths2/(2N1+7N2)；Three-level node using 3 length of CSMA sub-slots be total
The N of CSMA slot lengths2/(2N1+7N2), push away successively and must give level Four ..., the CSMA sub-slots that k level nodes are used.
8. the data transmission method in a kind of PLC system according to claim 3, it is characterised in that：The TDMA resources
It is allocated by the following method：
It is M that central control node count each node to need the number of carrying business1、M2、…、Ms(S values are less than or equal to 15),
Wherein, M1For the portfolio that node 1 is carried, M2For the portfolio ... that node 2 is carried, MsFor the portfolio that node s is carried；
Distribute to the M of the TDMA sub-slots 1 for total TDMA length of node 11/(M1+M2+..Ms)；Distribute to the TDMA period of the day from 11 p.m. to 1 a.m of node 2
M of the gap 2 for total TDMA length2/(M1+M2+..Ms)；Push away successively must distribute to node s TDMA sub-slots s be total TDMA length
Ms/(M1+M2+..Ms).
9. the data transfer controller in a kind of PLC system, it is characterised in that：The data transfer controller is PLC system
In central control node, include transfer resource distribute module in described device, for transfer resource is divided into multiple period of the day from 11 p.m. to 1 a.m
Gap, and every grade of node in system is distributed to, and described device occupancy is distributed to the transfer resource sub-slots of oneself and carries out data
Send, while device can receive the data on all transfer resource sub-slots；
Business detection module, for carrying out business detection, is transmitted resource allocation according to demand.
10. the data transmission set in a kind of PLC system, it is characterised in that：The data transmission set is the generation in PLC system
Reason node or end node, include resource information storage module in the equipment, for recording central control node point
The transfer resource sub-slots of the place classification with this node, and monitor the resource information from central control node in real time,
If central control node has withdrawn transfer resource or has changed transfer resource planning, by resource information storage module
Middle information real-time update.
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