CN106817150A - A kind of method for preventing power line carrier communication network network congestion control - Google Patents
A kind of method for preventing power line carrier communication network network congestion control Download PDFInfo
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- CN106817150A CN106817150A CN201510871260.0A CN201510871260A CN106817150A CN 106817150 A CN106817150 A CN 106817150A CN 201510871260 A CN201510871260 A CN 201510871260A CN 106817150 A CN106817150 A CN 106817150A
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- 230000004913 activation Effects 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims description 7
- 230000003993 interaction Effects 0.000 claims description 3
- 230000002265 prevention Effects 0.000 claims 5
- 230000002123 temporal effect Effects 0.000 claims 2
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Classifications
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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
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/12—Avoiding congestion; Recovering from congestion
- H04L47/125—Avoiding congestion; Recovering from congestion by balancing the load, e.g. traffic engineering
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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
- H04L47/2441—Traffic characterised by specific attributes, e.g. priority or QoS relying on flow classification, e.g. using integrated services [IntServ]
-
- 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
- H04L47/27—Evaluation or update of window size, e.g. using information derived from acknowledged [ACK] packets
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Abstract
A kind of method for preventing power line carrier communication network network congestion control, in view of the security of significant data, original CSMA/CA agreements for being used in power line carrier communication are improved, high-priority data and normal precedence DBMS is splitted data into, significant data is set to high priority.In order to ensure the security reliability of high-priority data, one proprietary high priority competition passage is hewed out, it is ensured that the high priority data transmission of high priority.Only high-priority data is transmitted, and normal precedence DBMS could be transmitted, and is so prevented significant data and is dropped because of competition failure.In addition, in order to ensure data safety, RF/AF handshake was with the addition of before high-priority data is sent, after handshake is successfully received and dispatched, packet can just send.The also effect with channel booking of RF frames, when finding to have high-priority data pending, Break Row is entered to original normal priority data is activation, preferentially sends high-priority data.
Description
Technical field
The design is related to intelligent grid field of power line communication, mainly to being used in existing power line carrier communication
General CSMA/CA（Carrier Sense Multiple Access with Collision Avoidance are with punching
The prominent csma for avoiding）Mechanism is improved, and realizes the control to power line carrier communication network network congestion.
Background technology
With the popularization of intelligent electric meter, the mode of artificial reading electricity has been taken leave of by electric company, can be in several ways
Electricity is obtained, most common of which one kind is exactly power line carrier communication.It is cheap as ammeter number with operation cost to design
According to the first-selection of communication.The power line carrier communication of early stage has a host node in a network, multiple from node, only main section
Point can initiate communication, and communication transmission state could be entered after only receiving access information from node.Therefore, in the absence of electric power
The conflict of line channel communication, but the utilization rate of network service is low.With carrying that the collection of electric power power information and field management are required
Height, many power consumers need the active report of event that will can occur from node from node, therefore it is required that from node and host node
Equally can actively initiate communication, the conflict that will be communicated so on power line, how according to power line carrier communication
Feature handles communication contention aware well, the vital task as power line carrier communication research.
Communication contention aware refers to, when data are transmitted in a network, two equipment occur or two or more equipment sends number simultaneously
According to phenomenon, so as to cause data congestion, the situation of loss of data in network.CSMA/CA agreements are normally at communication protocol
Media access layer MAC（Media Access Control）Layer, is one of core algorithm of media access layer.It using detection and
Two big means are avoided to avoid data collision, so as to ensure that the reliability of the transmission of data.When a node is wanted to send data
When, channel is detected first, whether observation channel is idle.If channel idle, wait for a period of time, then send data, other
Node all put channel busy flag bit NAV（Network Allocation Vector）.When destination node receives data frame
Afterwards, wait for a period of time transmission response ACK（Acknowledge）Frame.After source node receives ack msg frame, transmission is indicated
Data are completed.After waiting one period, into competition window, the competition of each node is sent, and the node for obtaining transmission route is repeated
Action is stated, the node without obtaining transmission route enters backoff state.
Because the major function of the channel of power line carrier communication is transmission electric power, designed for communication, therefore, it
It is not a preferable communication line.The bandwidth and speed of its communication are restricted, if the general CSMA/ of simple use
CA, when data communication is frequent, when channel congestion is serious, part of nodes may be constantly in avoidance state, according to CSMA/CA machines
System, it is likely that the state for abandoning sending can be entered, consequently, it is possible to the loss of partial data is caused, it is of the invention by significant data and general
Logical data separation comes, allow significant data prioritized contention send so that ensure important data on power line prioritised transmission and
Reliability.
The content of the invention
The present invention increased the claim frame RF of significant data transmission on the basis of CSMA/CA agreements（Request
Frame）With permission frame AF（Allow Frame）Order, so that it is guaranteed that the reliability of significant data communication, when a node needs
When sending high-priority data, a request signal RF is first sent, reserve channel after destination node have received RF, replys AF
Signal.After so both sides are successfully made RF/AF communication handshakes, the transmission of data is just carried out, it is ensured that the security reliability of data.
In addition, the present invention is also improved and divides to competition window, by competition window be divided into high priority window and
Normal priority window.Important communication data is arranged to high-priority data, when there is sending competition, initially enters height
Priority window is at war with, and waits high priority window to be finished, and entering back into normal priority window carries out data is activation competition,
To ensure the preferential transmission of significant data.
In the present invention, the format setting of RF and AF is source node short address by we（2 bytes）It is short with destination node
Address（2 bytes）, and a mode bit（1 byte）.The frame length of RF and AF is smaller, just corresponds to general data frame length
/ the tens of degree, to the expense very little of Internet resources.Therefore RF and AF orders, the transmission to the data on power line are increased
Amount influence is simultaneously little, but has the interaction of RF and AF, but can preferably protect the safety of high-priority data, it is to avoid important
The loss of data, also reduces data re-transmitting caused by factor data is lost.
On to the division of height priority window, can be according to some parameters（MaxBE is maximum index avoidance value,
MacHighPriorityWindowSize is high priority window time piece number, and SlotTime is a time in CSMA/CA
The duration of piece, maxBE and macHighPriorityWindowSize come from application layer, but oneself sets, and SlotTime comes from
In 802.15.4 standards）To determine the length of window time, the window width of high priority is set in the present invention（HPCW time）
For：
HPCW time = macHighPriorityWindowSize * SlotTime;
Due to keeping out of the way measure using binary system back off algorithm, then the window width of normal priority（NPCW time）It is then：
NPCW time = (2maxBE * SlotTime) – HPCW time;
Only when high priority window time is finished, normal priority window could be entered.
To ensure priority and reliability that significant data sends, this invention also proposed high-priority data preemptive type
Transmission mechanism.When a node in network is sending normal precedence DBMS, channel is in busy state.Now, net
A node in network receives the data of the high priority from application layer, high preferential in order to ensure this high priority data sends
DBMS is seized the normal precedence DBMS that transmission mechanism will be transmitted and is interrupted, and retransmission state is placed it into, under wait
Once send.High-priority data sending node is robbed after accounting for channel, preferentially by data is activation.
Brief description of the drawings
The fundamental diagram of Fig. 1 .CSMA/CA agreements；
Fig. 2 interframe spaces positions divide figure with competition window；
CSMA/CA agreement fundamental diagrams after Fig. 3 improvement；
Fig. 4 high-priority data transmission flow figures；
Fig. 5 high-priority datas seize transmission mechanism schematic diagram；
Specific implementation method
The present invention is discussed in detail below in conjunction with the accompanying drawings：
With reference to shown in Fig. 4, before data are sent, NB in initialization CSMA/CA（Keep out of the way number of times）And BE（Binary system index）Variable,
NB is set to 0, BE and is set to MinBE（Binary system index minimum value）, and low priority high to data judges.If
Judge that this data is high-priority data, into high priority competition window, then start conflict avoiding mechanism, wait one and keep away
The time is allowed, the avoidance time is random (CW)（According to the random number that competition window CW is generated）, carry out physical layer and monitor PCS
（physical carrier sense）.When acknowledgement channel is idle, will be into data is activation state.If it find that at this channel
In busy state, then add 1 by the variable of NB and BE, the value according to BE determines CW again（Competition window）Size.And judge
Whether the value of NB is more than maxCSMABackoffs（Maximum keeps out of the way number of times）If the value of NB goes beyond the scope, transmission is exited, such as
Fruit is without departing from into competition window.
If the data of high priority enter transmission state, a RF signal will be first sent to destination node, if target
Node receives RF signals, will feed back an AF signal, the preparation of shaking hands before carrying out data transmission.If RF signals have been sent out
Send, wait for a period of time, find to be responded without AF, can retransmit a RF, and count the transmission times of RF, if transmission times is super
Go out scope, exit transmission state.
During data are sent, after frame transmission, meeting certain interval of time retransmits next frame or waits next
Frame, this period is referred to as interframe space.Time interval between frame is very important for the transmission of data.With reference to Fig. 2
It is shown, in CSMA/CA agreements, there are two kinds of interframe spaces；Respectively CIFS and RIFS.CIFS（contention
interframe space）Frame gap is referred to as fought for, it shows that data is activation is completed after followed by ACK frames are sent completely.
RIFS（response interframe space）Referred to as reply interframe space, before it appears in ACK frames, data frame it
Afterwards.Interval between RF and AF is referred to as SIFS（short interframe space）Short frame gap.
For normal priority data is activation, high-priority data is waited to be sent completely first, high priority close,
Normal priority window is opened, and the data of normal priority carry out backoff contention into normal priority window, start physical layer
Monitor（PCS）, the acknowledgement channel free time, the data of transmission route are obtained, into the state of transmission, other data enter wait state.Obtain
The node of transmission route need not carry out RF/AF and shake hands, directly send the data to destination node, destination node receive data it
Afterwards, ACK frames are sent to source node, source node receives ACK frames, shows that data frame is sent completely.
In addition, in order to ensure the absolute priority of high-priority data transmission, it is contemplated that arrived high-priority data robbing
Account for formula and send mechanism.With reference to shown in Fig. 5, when a normal precedence DBMS is just in transmission process, another section in network
Point have received the data of the high priority that application layer is issued.Then this node is introduced into backoff state, right after keeping out of the way a period of time
Power line is intercepted and is judged the low priority high of data on power line.If the data priority transmitted on power line is height
During priority, then into wait state.If the data on power line are normal precedence DBMSs, node can send a RF
Frame, carries out channel booking, and interrupt normal priority data is activation.After original node for sending is interrupted, retransmission flag can be put
Position（Resend Flag）, wait and sending next time.Compete channel node receive the AF frames that destination node sends after, connect
Transmission data frame, after waiting until the ACK frames of destination node are replied, then this time high-priority data transmission terminates.
Claims (6)
1. a kind of method for preventing power line carrier communication network network congestion control, it is characterized in that it is used for power line carrier communication
CSMA/CA agreements, the method is divided to competition window, is divided into high priority window and normal priority window, in hair
When sending high-priority data, shaking hands for RF/AF is carried out first.
2. the method that described prevention power line carrier communication network network congestion control is required according to right 1, it is characterized in that, to competition
The division of window is specially：High priority window temporal duration is：HPCW time = macHighPriorityWindowSize
* SlotTime；Normal priority window temporal duration is：NPCW time = (2maxBE * SlotTime) – HPCW
time；Before high priority window is located at normal priority window, it is ensured that high-priority data preferentially passes through.
3. the method that described prevention power line carrier communication network network congestion control is required according to right 1, it is characterized in that, sending
Before when high-priority data, an interaction of RF/AF is had, source node sends RF, reserve channel, destination node
After receiving RF signals, send AF and replied, show that channel is normal, can send, after RF/AF interactions are completed, source node
Just data frame can be sent to destination node, destination node is received after the data frame of source node, send ACK frames and returned
Multiple, source node is received after ACK frames, just shows that data is activation has been completed.
4. the method for the prevention power line carrier communication network network congestion control according to right 3, it is characterized in that, send RF in source node
Afterwards, certain hour is waited, it is found that destination node does not send AF, show that channel is likely to occur certain exception；In this feelings
Under condition, source node sends RF again, and the number of times of the RF to sending adds up, if sending RF number overflows scope, and does not have
Normal AF signals are received, it can be determined that channel abnormal condition, into next round competition.
5. the method that described prevention power line carrier communication network network congestion control is required according to right 1, it is characterized in that, for general
The data of logical priority：High priority window is waited to stop, normal priority window is opened, and carries out the hair of normal precedence DBMS
Send；In to normal priority data transmission procedure, after not using RF/AF handshake mechanisms, source node to obtain transmission route, by data
Destination node is sent to, destination node is received after data frame, replys ACK frames to source node, show that this data is activation is completed.
6. the method that described prevention power line carrier communication network network congestion control is required according to right 1, it is characterized in that, for height
Priority data preemptive type transmitter system is specially：When the high-priority data that application layer is issued is received, first to keep out of the way one
The section time, the data on channel are intercepted and judged, when being the discovery that high-priority data, to be waited to be sent, until entering
Next round is competed, if it find that when being normal precedence DBMS, transmission RF frames give and interrupt, and seize channel, preferential to send, and are beaten
Disconnected node, puts retransmission flag position, after waiting high-priority data to be sent completely, into next round competition.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510871260.0A CN106817150A (en) | 2015-12-02 | 2015-12-02 | A kind of method for preventing power line carrier communication network network congestion control |
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| CN201510871260.0A CN106817150A (en) | 2015-12-02 | 2015-12-02 | A kind of method for preventing power line carrier communication network network congestion control |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107580042A (en) * | 2017-08-30 | 2018-01-12 | 广东电网有限责任公司中山供电局 | A method and system for transmitting distribution network data |
| WO2022089508A1 (en) * | 2020-10-29 | 2022-05-05 | 华为技术有限公司 | Service transmission method and apparatus |
-
2015
- 2015-12-02 CN CN201510871260.0A patent/CN106817150A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107580042A (en) * | 2017-08-30 | 2018-01-12 | 广东电网有限责任公司中山供电局 | A method and system for transmitting distribution network data |
| WO2022089508A1 (en) * | 2020-10-29 | 2022-05-05 | 华为技术有限公司 | Service transmission method and apparatus |
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Application publication date: 20170609 |