CN102594406A - Power line carrier communication system and communication method - Google Patents
Power line carrier communication system and communication method Download PDFInfo
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- CN102594406A CN102594406A CN2012100368315A CN201210036831A CN102594406A CN 102594406 A CN102594406 A CN 102594406A CN 2012100368315 A CN2012100368315 A CN 2012100368315A CN 201210036831 A CN201210036831 A CN 201210036831A CN 102594406 A CN102594406 A CN 102594406A
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Abstract
The invention provides a power line carrier communication system and communication method. The power line carrier communication system comprises a first communication interface, a second communication interface and a transmission-mode selecting unit, wherein the first communication interface establishes communication connection with a physical layer unit which supports multiple transmission modes; the transmission parameters in the transmission modes comprise modulation modes, channel encoding rate and times for repeated encoding; the second communication interface establishes communication connection with a media access control layer unit; the transmission-mode selecting unit is used for selecting one transmission mode for the physical layer unit according to information obtained in the communication process by the power line carrier communication system and obtained from the media access control layer unit, and configuring transmission rate corresponding to a current communication channel. Compared with the prior art, the power line carrier communication system and communication method disclosed by the invention have the advantages that the channel change condition can be reflected correctly, the transmission rate can be adjusted in a self-adaptive manner, and the communication reliability and the communication efficiency of power line carrier communication are improved.
Description
Technical field
The present invention relates to a kind of power line carrier communication field, particularly a kind of power-line carrier communication system and communication means of selecting to different transmission mode.
Background technology
Power-line carrier communication is that a kind of power line that utilizes comes the communication mode of transmitting data information as communication medium, and its mode with carrier wave realizes the transport communication of data, voice, video etc.This technology is widely used in industry fields such as communication, electric power, Industry Control now, and this communication technology is a kind of advanced person's in the current communications industry a technology.
Power-line carrier communication generally comprises: by the hv transmission line of 35kV and the above electric pressure high-tension electricity line carrier communication as communication medium; By the middle pressure transmission line of 10kV electric pressure medium voltage electricity line carrier communication as communication medium; And by the low pressure transmission line of 380V or 220V low-voltage powerline carrier communication as communication medium.
Traditional power line carrier communication mainly utilizes the transmission channel of hv transmission line as high-frequency signal, only is confined to transmit remote control signal etc., narrow in application range, and transmission rate is lower.At present, along with the continuous development and the needs of society of power line carrier technology, power line carrier, PLC is turning to and is adopting low-voltage network to carry out carrier communication, makes the technological development of low-voltage powerline carrier communication and application situation in the ascendant occur.
The low-voltage powerline carrier communication channel is a time varying channel, same channel in different time sections owing to factors such as interference, impedance variations make channel response function different; In addition, the terminal node that is in the network diverse location makes also different with the channel response function of concentrator because path attenuation is significantly different.This terminal node that just requires to be in the network diverse location adopts different transmission parameter and concentrator to communicate; For example: near-end node can need to reduce transmitted power, raising transmission rate and concentrator and communicate, and distant-end node then need improve transmitted power, the reduction transmission rate obtains reliable communication.
What physical layer adopted in the existing low-voltage powerline carrier communication solution is the fixed-rate transmission mode.Even some power line carrier communication equipment development merchant physical layers provide multiple transmission mode, but Installation and Debugging manual modification physical layer parameter changes transmission rate at the scene, then no longer revises after being delivered for use.The shortcoming of this solution is after the network installation debugging finishes, to reach in the running of several years; Physical layer transmission speed immobilizes; Can not correctly reflect channel variance situation; Cause occurring transmission rate and selected phenomenon low or that the transmission rate selection is too high, the communication reliability of system and communication efficiency are in lower level.
Summary of the invention
The object of the present invention is to provide a kind of power-line carrier communication system and communication means, be used to solve existing transmission rate and immobilize and cause communication reliability and the lower problem of communication efficiency.
One aspect of the present invention provides a kind of power-line carrier communication system, comprising: physical layer element and media access control layer unit, and first communication interface establishes a communications link with said physical layer element; Said physical layer element is supported multiple transmission mode; Transmission parameter in the said transmission mode comprises the number of repetition of modulation system, chnnel coding code check, repeated encoding; The second communication interface establishes a communications link with said media access control layer unit; The transmission mode selection unit; Be used for according to the information of the power-line carrier communication system that obtains from said media access control layer unit in the communication process acquisition; For the selected a kind of transmission mode of said physical layer element, dispose the transmission rate corresponding with current communication channel.
Alternatively, said transmission mode selection unit is the device that is independent of said media access control layer unit.
Alternatively, said transmission mode selection unit is integrated in the said media access control layer unit.
The present invention provides the power line carrier communication that is applied to above-mentioned power-line carrier communication system method on the other hand, comprising: multiple transmission mode prestores in said transmission mode selection unit; Transmission parameter in the said transmission mode comprises the number of repetition of modulation system, chnnel coding code check, repeated encoding; Information and preset algorithmic rule according to the power-line carrier communication system that obtains in the said media access control layer unit obtains at communication process are the selected a kind of transmission mode of said physical layer element.
Alternatively, when said power-line carrier communication system support confirm/when denying acknowledgement frame, deny for one signal or wait acknowledge/deny that acknowledgement frame is overtime on current transmission rate combination foundation, reducing the transmission rate of one-level (or multistage) when receiving; When receiving M confirmation signal continuously, on current transmission rate combination foundation, improve the transmission rate of one-level, wherein, M＞=2.
Alternatively, when said power-line carrier communication system do not support to confirm/when denying acknowledgement frame, when receiving retransmission instructions, on current transmission rate combination foundation, reduce the transmission rate of one-level (or multistage); When continuous N time transmits all successes, promptly in the process of continuous N time, do not receive retransmission instructions, then on current transmission rate basis, improve the transmission rate of one-level, wherein, M＞=2.
Alternatively, to the number of repetition of the modulation system in the transmission mode, code check, repeated encoding, the number of combinations of supposing the transmission mode of said power-line carrier communication system support is N; At first by said physical layer element a mapping search table is provided, Signal Interference and Noise Ratio SINR of combination mapping of a transmission mode is interval; In the communication running, said physical layer element carries out SINR and calculates, and result of calculation is fed back to said media access control layer unit, carries out Filtering Processing by said media access control layer unit; Check the SINR interval that the SINR value after Filtering Processing falls into, the transmission parameter in the selected said SINR interval.
Alternatively, said media access control layer unit carries out Filtering Processing and obtains through following method: through the SINR value SINR of current time after the α filtering
α(i) equal previous moment through the filtered SINR value of α SINR
α(i-1) with the product of first coefficient (1-α) add SINR value SINR (i) that the current time physical layer reports and second alpha the product gained and, wherein, the scope of second alpha is greater than 0 and smaller or equal to 1.
Power-line carrier communication system of the present invention and communication means; Obtain the information of communication channel in the communication running (promptly; The situation of change that can correctly reflect communication channel), thereby selectes a kind of transmission mode in view of the above, dispose the transmission rate corresponding with current communication channel.Than the fixing prior art of transmission rate, the present invention can correctly reflect channel variance situation and self adaptation adjustment transmission rate, improves the communication reliability and the communication efficiency of power line carrier communication.
Description of drawings
Fig. 1 has shown power-line carrier communication system of the present invention module diagram in the first embodiment.
Fig. 2 has shown the module diagram of power-line carrier communication system of the present invention in second execution mode.
Fig. 3 has shown the schematic flow sheet of power line carrier communication method of the present invention.
Embodiment
Inventor of the present invention finds: what physical layer adopted in the existing low-voltage powerline carrier communication solution is the fixed-rate transmission mode; Because physical layer transmission speed immobilizes; Can not correctly reflect channel variance situation; Cause occurring transmission rate and selected phenomenon low or that the transmission rate selection is too high, the communication reliability of system and communication efficiency are in lower level.
Therefore; Inventor of the present invention improves prior art; Can obtain the information of communication channel in the communication running in real time; Thereby can select a kind of transmission mode according to the actual state of communication channel, dispose the transmission rate corresponding, improve the communication reliability and the communication efficiency of power line carrier communication with current communication channel.。
Below through specific instantiation execution mode of the present invention is described, those skilled in the art can understand other advantages of the present invention and effect easily by the content that this specification disclosed.The present invention can also implement or use through other different embodiment, and each item details in this specification also can be based on different viewpoints and application, carries out various modifications or change under the spirit of the present invention not deviating from.
Need to prove; The diagram that is provided in the present embodiment is only explained basic conception of the present invention in a schematic way; Satisfy only show in the diagram with the present invention in relevant assembly but not component count, shape and plotted when implementing according to reality; Kenel, quantity and the ratio of each assembly can be a kind of random change during its actual enforcement, and its assembly layout kenel also maybe be more complicated.
See also Fig. 1, shown power-line carrier communication system of the present invention module diagram in the first embodiment.As shown in Figure 1; Said power-line carrier communication system includes physical layer element 1, medium access control (MediaAccess Control; MAC) layer unit 3; And between physical layer element 1 and media access control layer unit 3 transmission mode selection unit 22, transmission mode selection unit 22 utilizes first communication interface 21 and physical layer element 1 to establish a communications link, and utilizes second communication interface 23 and media access control layer unit 3 to establish a communications link.
Below above-mentioned each unit is further detailed.
Transmission mode selection unit 22; Be used for according to from the media access control layer unit 3 power-line carrier communication systems that obtain and/or communication channel in the information and preset algorithmic rule of communication running; For physical layer element 1 selected a kind of transmission mode, dispose the transmission rate corresponding with current communication channel.
See also Fig. 2, shown the module diagram of power-line carrier communication system of the present invention in second execution mode.As shown in Figure 2; Said power-line carrier communication system includes physical layer element 1, media access control layer unit 3; And between physical layer element 1 and media access control layer unit 3 transmission mode selection unit 22 '; Transmission mode selection unit 22 ' utilizes first communication interface 21 ' to establish a communications link with physical layer element 1, utilizes second communication interface 23 ' and media access control layer unit 3 to establish a communications link.
Can find out that second execution mode is compared with first execution mode, both differences are: the transmission mode selection device that the position is set is different.In the first embodiment; Transmission mode selection device 2 is devices that are independent of media access control layer unit 3; And in second execution mode, transmission mode selection device 2 ' is integrated in the media access control layer unit 3, has the high advantage of integrated level.
Fig. 3 has shown the schematic flow sheet of power line carrier communication method of the present invention.As shown in Figure 3, said power line carrier communication method comprises:
Step S11, multiple transmission mode prestores in said transmission mode selection unit.Transmission parameter in the said transmission mode comprises the number of repetition of modulation system, chnnel coding code check, repeated encoding.Different selected value according to the number of repetition of modulation system, chnnel coding code check, repeated encoding in the said transmission parameter can obtain to form the multiple transmission mode with different transmission rates.
Step S13 obtains the information that power-line carrier communication system obtains at communication process from said media access control layer unit;
Step S15 according to the information of the communication channel that is obtained, and combines preset algorithmic rule, for the selected a kind of transmission mode of said physical layer element, disposes the transmission rate corresponding with current communication channel.
Below with instantiation foregoing description is elaborated.
Embodiment one:
To support to confirm (ACK, ACKnowledgment)/deny the power-line carrier communication system of (NACK, Negative ACKnowledgement) acknowledgement frame.
To comprising modulation system, code check, repeated encoding number of repetition transmission parameter; The default value setting of system is without loss of generality, and to be set at like BPSK modulation (Binary Phase Shift Keying, biphase phase shift keying), 1/2 code check (female sign indicating number code check), repeated encoding number of times be 1.The number of combinations of supposing these transmission parameters of system's support is N, and this N group combinations of parameters is sorted by transmission rate from high to low.
When receiving a NACK signal or waiting for that the ACK/NACK acknowledgement frame is overtime, then on current transmission rate combination foundation, reduce one or more levels transmission rate; When receiving the individual ack signal of M (M＞=2) continuously, then on current transmission rate combination foundation, improve the transmission rate of one-level.
Embodiment two:
To not supporting to confirm (ACK)/deny power-line carrier communication system of (NACK) acknowledgement frame.
In power-line carrier communication system, checking meter is one of most important applications, and what copy and accept is a day freezing data.Copy and accept instruction and once copy and accept unsuccessfully when concentrator sends, can copy again, promptly send once more and copy and accept instruction.
In order to improve the communication probability of success, copy instruction again when receiving, on current transmission rate combination foundation, reduce one or more levels transmission rate.Copy and accept all successfully if continuous N (M＞=2) is inferior, promptly, do not receive and copy instruction again, then on current transmission rate basis, improve the transmission rate of one-level in inferior the copying and accepting in the process of continuous N.
Embodiment three
To comprising modulation system, code check, repeated encoding number of repetition transmission parameter, the number of combinations of supposing the supported transmission mode of power-line carrier communication system is N.At first a mapping search table is provided by physical layer element; Signal Interference and Noise Ratio (Signal to Interference plus Noise Ratio of combination mapping of a transmission mode; SINR) interval, the combination of N transmission mode is just shone upon and is obtained N SINR interval like this.The rule of mapping is in this SINR interval, the bit error rate of power-line carrier communication system (Bit Error Ratio, BER) or FER (Frame Error Rate FER) is not higher than the bit error rate BER or the FER FER of system requirements.
Power-line carrier communication system is in the communication running, and physical layer element carries out SINR and calculates, and result of calculation is fed back to the media access control layer unit.By the media access control layer unit SINR is carried out Filtering Processing by following formula:
SINR
α(i)＝(1-α)*SINR
α(i-1)+α*SINR(i)，α∈(0，1]；
Wherein, SINR (i) representes the SINR value that the current time physical layer reports;
SINR
α(i-1) the expression previous moment is through the filtered SINR value of α;
SINR
α(i) the SINR value of current time after the expression process α filtering.
Check the SINR after the Filtering Processing
α(i) which SINR of dropping on of value is interval, and the interval pairing modulation system of this SINR, code check, the combination of repeated encoding number of repetition are the transmission parameter of selecting for use.
In sum; Power-line carrier communication system of the present invention and communication means obtain the information (that is the situation of change that, can correctly reflect communication channel) of communication channel in the communication running; Thereby selected in view of the above a kind of transmission mode disposes the transmission rate corresponding with current communication channel.Than the fixing prior art of transmission rate, the present invention can correctly reflect channel variance situation and self adaptation adjustment transmission rate, improves the communication reliability and the communication efficiency of power line carrier communication.
The foregoing description is just listed expressivity principle of the present invention and effect is described, but not is used to limit the present invention.Any personnel that are familiar with this technology all can make amendment to the foregoing description under spirit of the present invention and scope.Therefore, rights protection scope of the present invention should be listed like claims.
Claims (8)
1. a power-line carrier communication system comprises physical layer element and media access control layer unit, it is characterized in that said power-line carrier communication system also comprises:
First communication interface establishes a communications link with said physical layer element; Said physical layer element is supported multiple transmission mode; Transmission parameter in the said transmission mode comprises the number of repetition of modulation system, chnnel coding code check, repeated encoding;
The second communication interface establishes a communications link with said media access control layer unit;
The transmission mode selection unit; Be used for according to the information of the power-line carrier communication system that obtains from said media access control layer unit in the communication process acquisition; For the selected a kind of transmission mode of said physical layer element, dispose the transmission rate corresponding with current communication channel.
2. power-line carrier communication system according to claim 1 is characterized in that, said transmission mode selection unit is the device that is independent of said media access control layer unit.
3. power-line carrier communication system according to claim 1 is characterized in that, said transmission mode selection unit is integrated in the said media access control layer unit.
4. a power line carrier communication method that is applied to like arbitrary said power-line carrier communication system in the claim 1 to 3 is characterized in that, comprising:
Multiple transmission mode prestores in said transmission mode selection unit; Transmission parameter in the said transmission mode comprises the number of repetition of modulation system, chnnel coding code check, repeated encoding;
Information and preset algorithmic rule according to the power-line carrier communication system that obtains in the said media access control layer unit obtains at communication process are the selected a kind of transmission mode of said physical layer element.
5. power line carrier communication method according to claim 4 is characterized in that:
When said power-line carrier communication system support confirm/when denying acknowledgement frame, deny for one signal or wait acknowledge/deny that acknowledgement frame is overtime on current transmission rate combination foundation, reducing the transmission rate of one-level (or multistage) when receiving; When receiving M confirmation signal continuously, on current transmission rate combination foundation, improve the transmission rate of one-level, wherein, M＞=2.
6. power line carrier communication method according to claim 4 is characterized in that:
When said power-line carrier communication system do not support to confirm/when denying acknowledgement frame, when receiving retransmission instructions, on current transmission rate combination foundation, reduce the transmission rate of one-level (or multistage); When continuous N time transmits all successes, promptly in the process of continuous N time, do not receive retransmission instructions, then on current transmission rate basis, improve the transmission rate of one-level, wherein, M＞=2.
7. power line carrier communication method according to claim 4 is characterized in that:
To the number of repetition of the modulation system in the transmission mode, code check, repeated encoding, the number of combinations of supposing the transmission mode of said power-line carrier communication system support is N; At first by said physical layer element a mapping search table is provided, Signal Interference and Noise Ratio SINR of combination mapping of a transmission mode is interval; In the communication running, said physical layer element carries out SINR and calculates, and result of calculation is fed back to said media access control layer unit, carries out Filtering Processing by said media access control layer unit; Check the SINR interval that the SINR value after Filtering Processing falls into, the transmission parameter in the selected said SINR interval.
8. power line carrier communication method according to claim 7 is characterized in that, said media access control layer unit carries out Filtering Processing and obtains through following method:
SINR value SINR through current time after the α filtering
α(i) equal previous moment through the filtered SINR value of α SINR
α(i-1) with the product of first coefficient (1-α) add SINR value SINR (i) that the current time physical layer reports and second alpha the product gained and, wherein, the scope of second alpha is greater than 0 and smaller or equal to 1.
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| CN103975572A (en) * | 2012-10-09 | 2014-08-06 | 松下电器产业株式会社 | Wireless communication device, wireless communication method, and wireless communication control program |
| CN104143999A (en) * | 2013-05-08 | 2014-11-12 | 上海海尔集成电路有限公司 | Power line carrier communication method and device |
| CN106340177A (en) * | 2016-11-02 | 2017-01-18 | 北京华电知企能源技术服务有限公司 | System for automatically matching Baud rates of ammeter broadband carrier communication interface and control method thereof |
| CN106685482A (en) * | 2017-02-24 | 2017-05-17 | 北京智芯微电子科技有限公司 | Method, device and system for power line carrier communication with dynamic adjustable rate |
| CN111566964A (en) * | 2017-12-27 | 2020-08-21 | 奥兰治 | Variable bit rate communication method for selecting transmission interface and corresponding equipment |
| WO2021082672A1 (en) * | 2019-10-29 | 2021-05-06 | 华为技术有限公司 | Signal processing method, communication chip, and communication apparatus |
| CN116094545A (en) * | 2023-02-03 | 2023-05-09 | 广东聚核智能电器股份有限公司 | Method and system for solving application interference of plc electrical control equipment |
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| CN111566964A (en) * | 2017-12-27 | 2020-08-21 | 奥兰治 | Variable bit rate communication method for selecting transmission interface and corresponding equipment |
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| WO2021082672A1 (en) * | 2019-10-29 | 2021-05-06 | 华为技术有限公司 | Signal processing method, communication chip, and communication apparatus |
| CN116094545A (en) * | 2023-02-03 | 2023-05-09 | 广东聚核智能电器股份有限公司 | Method and system for solving application interference of plc electrical control equipment |
| CN116094545B (en) * | 2023-02-03 | 2023-12-08 | 河北泽丰宇辰电气设备制造有限公司 | Method and system for solving application interference of plc electrical control equipment |
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Application publication date: 20120718 |