CN110557232A - communication mode selection method of dual-mode communication network - Google Patents
communication mode selection method of dual-mode communication network Download PDFInfo
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- CN110557232A CN110557232A CN201910866357.0A CN201910866357A CN110557232A CN 110557232 A CN110557232 A CN 110557232A CN 201910866357 A CN201910866357 A CN 201910866357A CN 110557232 A CN110557232 A CN 110557232A
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C19/00—Electric signal transmission systems
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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
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
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Abstract
The invention discloses a communication mode selection method of a dual-mode communication network, which comprises the following steps: selecting a mode for sending a data frame according to the power failure condition and the historical information; the STA station sends a data frame to the CCO station; detecting whether an ACK frame of the CCO station is received before a retransmission timer overflows; if the ACK frame is not received, a retransmission mode is selected according to various information. According to the communication mode selection method of the dual-mode communication network, the communication mode for sending the data frame is selected through the power failure condition and the history message, so that the STA station can select a more effective communication mode to send the data frame at a high probability, and the transmission reliability is improved. By comprehensively judging the conditions of the power failure condition, the sending mode and whether the information is received, the STA station can select a more effective communication mode to send the data frame with high probability, thereby effectively reducing the transmission overhead and reducing the average delay of the data frame.
Description
Technical Field
The invention belongs to the technical field of broadband power line carrier communication, and particularly relates to a communication mode selection method of a dual-mode communication network.
background
In recent years, with the development of large national-scale power grid transformation, how to solve the problem of automatic management of increasingly large power supply networks is urgent. A large number of automatic centralized meter reading technologies have appeared, and a power line carrier is one of the mainstream technologies.
because the low-voltage Power network has the characteristics of complex structure, random interference and the like, the problems of low reliability, untimely meter reading and the like of the traditional PLC (Power Line Carrier) meter reading technology are caused. With the evolution of various communication technologies, a centralized meter reading mode by using dual-mode communication has become a trend, wherein a dual-mode scheme of broadband power line carrier plus wireless communication becomes one of promising solutions. The dual-mode communication mode not only can be compatible with the traditional PLC technology, but also can supplement the technical defects of broadband power line carriers by utilizing the advantages of the wireless communication technology, thereby improving the timeliness and reliability of meter reading.
in a dual-mode communication mode mainly based on a broadband PLC, when a CCO (Central coordinator) receives an SOF (Start of Frame) data Frame that needs to be confirmed, an ACK (Acknowledgement) Frame needs to be replied to an STA (Station) Station. When power failure occurs due to the reasons of cell power failure maintenance or PLC line damage and the like, if the STA station cannot accurately identify whether the PLC line can continue to send messages when sending data frames, the SOF data frames cannot be sent to the CCO station possibly due to the fact that the STA station continues to adopt the communication mode with the priority of the broadband PLC, and the STA station conducts overtime retransmission after waiting for a period of time. Since the ACK packet cannot be sent to the STA station in time, the following technical problems will occur:
the STA station fails to retransmit the SOF data frame overtime for multiple times, resulting in longer time to wait for the ACK frame, thereby reducing the timeliness of data transmission.
Disclosure of Invention
The invention aims to provide a communication mode selection method of a dual-mode communication network, which aims to solve the problem that due to power failure, an STA (station) fails to retransmit an SOF (System on a fly) data frame overtime for multiple times, so that the time for waiting for an ACK (acknowledgement) frame is longer, and the timeliness of data transmission is reduced.
in order to achieve the purpose, the invention adopts the following technical scheme:
a communication mode selection method for a dual-mode communication network, comprising the steps of:
Selecting a mode for sending a data frame according to the power failure condition and the historical information;
the STA station sends a data frame to the CCO station;
detecting whether an ACK frame of the CCO station is received before a retransmission timer overflows;
If the ACK frame is not received, selecting a retransmission mode according to various information; the various information includes power outage status, transmission mode, and whether information is received.
optionally, after detecting whether an ACK frame of the CCO station is received before the retransmission timer overflows, the method further includes the following steps:
and if the ACK frame is received, the communication is finished.
Optionally, the selecting a mode of sending the data frame according to the power outage condition and the history information specifically includes the following steps:
the STA site records a transmission log transmitted last time, wherein the transmission log comprises a power failure state, a communication mode and a transmission result;
Before sending the SOF data frame, the STA station firstly checks whether the current station is in a power failure state;
If the current state is not in a power failure state, selecting a broadband PLC mode to send a data frame; the STA station records a transmission log of the data frame transmitted this time.
Optionally, before sending the SOF data frame, the STA station first checks whether the STA station is currently in a power-off state, and then further includes the following steps:
If the current state is in a power failure state, selecting a communication mode for sending the SOF data frame according to the last transmission log;
if the transmission log is that the broadband PLC is used for successfully transmitting the data frame without power failure, selecting a broadband PLC mode to transmit the SOF data frame;
if the transmission log is that the broadband PLC is used for successfully transmitting the data frame when power is cut off, the mode of the broadband PLC is selected to transmit the SOF data frame, and then the STA station records the transmission log of the data frame transmitted this time;
if the transmission log is that the wireless communication mode is used for successfully transmitting the data frame without power failure, the communication mode is selected to transmit the SOF data frame according to equal probability, and then the STA station records the transmission log of the data frame transmitted this time;
If the transmission log indicates that the data frame is not successfully transmitted or the wireless communication mode is used for successfully transmitting the data frame during power failure, selecting the communication mode to transmit the SOF data frame according to a probability ratio of 2:1, wherein the probability ratio is the ratio of the probability of selecting the wireless communication mode and the PLC mode; the STA station then records a transmission log of this time the data frame is transmitted.
Optionally, the selecting the retransmission mode according to the plurality of information specifically includes the following steps:
judging the current retransmission times;
If the current retransmission times is 0, the STA station judges whether to receive the message according to the power failure condition, the sending mode and the first retransmission time;
If the current retransmission times is 1, the STA station judges whether to receive the message according to the power failure condition, the sending mode and the condition and then performs the 2 nd retransmission;
if the current retransmission times is 2, the STA station judges whether to receive the message according to the power failure condition, the sending mode and the third aspect and then performs the 3 rd retransmission;
if the current retransmission number is 3 or more, the retransmission fails and the procedure ends.
optionally, the STA performs retransmission for the 1 st time after determining according to the power outage condition, the transmission mode, and whether the STA receives the message, which specifically includes the following steps:
Judging whether power is cut off at present;
if the power is not cut off at present, a PLC mode is selected to send the data frame;
if the power is cut off currently, judging whether the information is received from the channel;
If the information is received, selecting the communication mode of the last transmission to transmit the data frame;
if the information is not received, detecting whether the PLC is used for sending the data frame last time;
Selecting a wireless communication mode with a probability of 2/3 if the last time the PLC was used;
If the PLC is not used last time, the PLC or the wireless communication is selected as the communication mode with equal probability.
optionally, the STA performs retransmission for the 2 nd time after determining according to the power outage condition, the transmission mode, and whether the STA receives the message, which specifically includes the following steps:
judging whether power is cut off at present;
If no power failure occurs, judging whether the PLC is selected to transmit the data frame in the previous two times or not;
If the PLC is selected in the first two times, the wireless communication mode is selected to send the data frame;
If the PLC is not selected in the first two times, the PLC mode is selected to send the data frame;
if the power failure occurs, judging whether the information is received from the channel;
if the information is received, selecting the communication mode of the last transmission to transmit the data frame;
if the information is not received, detecting whether the PLC is used for sending the data frame last time;
selecting a wireless communication mode with a probability of 2/3 if the last time the PLC was used;
If the PLC is not used in the last time, judging whether the wireless communication mode is selected to send the data frame in the previous two times or not;
If the wireless communication mode is selected in the first two times, a PLC mode is selected to send the data frame;
if the wireless communication mode is not selected in the first two times, the PLC or the wireless communication is selected as the communication mode with equal probability.
Optionally, the STA performs retransmission for the 3 rd time after determining according to the power outage condition, the transmission mode, and whether the STA receives the message, which specifically includes the following steps:
judging whether power is cut off at present;
If no power failure exists currently, judging whether the PLC is selected to transmit the data frame in the previous three times or not;
if the PLC is selected in the first three times, selecting a wireless communication mode;
If the PLC is not selected in the first three times, the PLC mode is selected;
if the current power failure is power failure, judging whether the information is received from the channel;
if the information is received, selecting the communication mode of the last transmission to transmit the data frame;
if the information is not received, detecting whether the PLC is used for sending the data frame last time;
Selecting a wireless communication mode with a probability of 2/3 if the last time the PLC was used;
if the PLC is not used last time, the PLC or the wireless communication mode is selected with equal probability to transmit the data frame.
Optionally, the wireless communication is a Lora communication.
compared with the prior art, the embodiment of the invention has the following beneficial effects:
according to the communication mode selection method of the dual-mode communication network provided by the embodiment of the invention, the communication mode for sending the data frame is selected through the power failure condition and the historical information, so that the STA station can select a more effective communication mode to send the data frame at a high probability, and the transmission reliability is increased. By comprehensively judging the conditions of the power failure condition, the sending mode and whether the information is received, the STA station can select a more effective communication mode to send the data frame with high probability, thereby effectively reducing the transmission overhead and reducing the average delay of the data frame.
drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, should still fall within the scope covered by the contents disclosed in the present invention.
fig. 1 is a tree structure diagram of a broadband PLC communication network system according to an embodiment of the present invention.
fig. 2 is an OSI seven-layer model of a broadband PLC communication network system according to an embodiment of the present invention.
fig. 3 is an MPDU frame format according to an embodiment of the present invention.
fig. 4 is a diagram of generating a long MPDU according to an embodiment of the present invention.
Fig. 5 is a format diagram of a physical block header of an SOF frame according to an embodiment of the present invention.
fig. 6 to fig. 12 are flowcharts of a communication mode selection method of a dual-mode communication network according to an embodiment of the present invention.
Detailed Description
in order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
please refer to fig. 1.
in a broadband PLC communication network, a multi-level tree network is generally formed in which a CCO (Central Coordinator) is used as a center and a PCO (proxy Coordinator) is used as a relay agent to connect all STAs. Wherein the numbers following the PCO and STA are numbers.
please refer to fig. 2.
Specifically, the broadband carrier communication network protocol stack defines 3 layers including a physical layer, a data link layer, and an application layer based on a standard Open System Interconnection (OSI) seven-layer model, and a basic structure is shown in fig. 2. The data link layer is divided into a network management sublayer and a Media Access Control (MAC) sublayer. The data link layer directly provides transmission service for the application layer, and can also be extended to interface with standard TCP/IP to realize standard IP network communication.
please refer to fig. 3.
further, an MPDU (MAC Protocol Data Unit, MAC layer Protocol Data Unit) is provided to the physical layer by the MAC sublayer, and a basic transmission Unit of Data is transmitted between physical layers of different stations. When transmitting data, the physical layer must transmit according to a Forward Error Correction (FEC) block, which supports two sizes of 520 bytes and 136 bytes.
and if the MAC frame length exceeds the format requirement of the MPDU, fragmentation processing is required. MPDUs with payload are called long MPDUs, otherwise called short MPDUs, and the MPDU frame format is shown in fig. 3.
please refer to fig. 4.
Further, one MAC frame is generated by one MSDU (MAC Service Data Unit), but one MAC frame may be divided into multiple pieces before transmission using MPDUs. When transmitting data, the physical layer must transmit according to FEC blocks, which support two sizes, 520 bytes and 136 bytes. The MAC frame must adapt the format of the MPDU before it is handed to the physical layer for transmission, and a long MPDU is generated as shown in fig. 4.
please refer to fig. 5.
The format of the SOF (Start of Frame) Frame physical block header is shown in fig. 5, and one SOF Frame can be extended to support the transmission of 4 physical blocks at most. The recombination of the MAC is the reverse process of the fragmentation of the MAC frame.
the embodiment provides a communication mode selection method of a dual-mode communication network, which is used for solving the problem that due to power failure, an STA (station) fails to retransmit an SOF (soft acknowledgement) data frame overtime for multiple times, so that the time for waiting for an ACK (acknowledgement) frame is long, and the timeliness of data transmission is reduced.
in the present embodiment, the dual-mode communication network includes a broadband PLC communication mode and a micro-power wireless communication mode.
specifically, the current micropower wireless communication technologies mainly include GPRS, WiFi, ZigBee, NB-IOT, and LoRa (Long Range, Long distance transmission). The GPRS and NB-IOT technologies are too high in cost and are not suitable for large-scale application; the WiFi communication technology is large in power consumption and is not suitable for an intelligent power utilization system; the Zigbee technology has limited communication distance and poor signal diffraction capability, and is not suitable for being used in buildings; the LoRa technology is a low-cost, low-power consumption, long-distance wireless communication technology, and has wide application prospect in the field of intelligent meter reading.
Therefore, in the present embodiment, the micro-power wireless communication employs the LoRa mode as the auxiliary communication mode in the dual mode communication.
it should be noted that, the communication mode selection method for the dual-mode communication network provided in this embodiment has the following limitations:
(1) the broadband PLC is a main communication mode of dual-mode communication, and the micro-power wireless communication is an auxiliary communication module.
(2) And the transmission of the SOF data frame adopts an acknowledgement retransmission mode.
(3) The STA station sends acquisition information to the PCO station once at regular intervals (e.g., 20 seconds).
(4) The communication mode may be selected independently each time a data packet is transmitted, whether it is initially transmitted or retransmitted.
(5) Broadband PLC communication may suffer from various data and non-data interference.
in the prior art, in a dual-mode communication mode mainly based on broadband PLC, after receiving an SOF data frame that needs to be confirmed, a CCO needs to reply an ACK frame to an STA station. When power failure occurs due to the reasons of cell power failure maintenance or PLC line damage and the like, if the STA station cannot accurately identify whether the PLC line can continue to send messages when sending data frames, the SOF data frames cannot be sent to the CCO station possibly due to the fact that the STA station continues to adopt the communication mode with the priority of the broadband PLC, and the STA station conducts overtime retransmission after waiting for a period of time. Because the ACK packet cannot be sent to the STA station in time, the following two technical problems will occur:
1. The STA station fails to retransmit the SOF data frame overtime for multiple times, resulting in longer time to wait for the ACK frame, thereby reducing the timeliness of data transmission.
2. The STA station cannot select an effective data retransmission method using the existing conditions, resulting in multiple SOF data frame retransmissions, thereby increasing network communication control overhead.
in view of the above, the present embodiment provides a communication mode selection method for a dual-mode communication network, which includes two new mechanisms, namely "a mode selection mechanism based on power failure conditions and historical information" and "a mode selection retransmission mechanism based on multiple types of information", which are respectively referred to as new mechanism 1 and new mechanism 2. By adopting a new mechanism of 'a mode selection mechanism based on power failure conditions and historical information', a transmission communication mode can be accurately selected at a large probability before a data frame is sent, the time for the STA station to wait for the ACK frame is reduced, and the timeliness of data transmission is improved; by adopting a new mechanism of selecting a retransmission mode based on various information, the number of times of retransmitting the data frame by the STA station can be reduced when the data frame is retransmitted, and the network communication overhead is reduced.
please refer to fig. 6.
Specifically, the communication mode selection method of the dual-mode communication network includes the following steps:
S1, selecting a mode for sending the data frame according to the power failure condition and the historical information;
s2, the STA station sends a data frame to the CCO station; at this time, the CCO station needs to send an ACK frame to the STA station;
S3, detecting whether an ACK frame of the CCO station is received before the overflow of the retransmission timer;
S4, if the ACK frame is received, the communication is completed;
S5, if the ACK frame is not received, selecting a retransmission mode according to various information; the various information includes power outage status, transmission mode, and whether information is received.
please refer to fig. 7 and 8.
Further, step S1 includes the following steps:
S101, the STA site records a transmission log transmitted last time, wherein the transmission log comprises a power failure state, a communication mode and a transmission result.
specifically, the transmission log is divided into the following five cases according to the power failure state, the communication mode, and the transmission result:
the data frame is not successfully transmitted, the data frame is successfully transmitted by using the broadband PLC without power failure, the data frame is successfully transmitted by using the wireless communication mode without power failure, and the data frame is successfully transmitted by using the wireless communication mode with power failure.
s102, before sending the SOF data frame, the STA station firstly checks whether the current state is in a power failure state.
s103, if the power failure state is not achieved currently, a broadband PLC mode is selected to send data frames; then step S109 is executed.
s104, if the current state is in a power failure state, selecting a communication mode for sending the SOF data frame according to the last transmission log; because, if power is cut, the reason can be PLC line damage or cell power failure maintenance.
and S105, if the transmission log indicates that the broadband PLC is used for successfully transmitting the data frame without power failure, selecting the broadband PLC mode to transmit the SOF data frame.
s106, if the transmission log indicates that the broadband PLC is used for successfully transmitting the data frame in the power failure, the mode of the broadband PLC is selected to transmit the SOF data frame, and then the step S109 is executed.
S107, if the transmission log is that the wireless communication mode is used for successfully transmitting the data frame without power failure, selecting the communication mode with equal probability to transmit the SOF data frame, and then executing the step S109; the equal probability selection communication mode is a PLC communication mode or a wireless communication mode randomly selected with the same probability.
And S108, if the transmission log indicates that the data frame is not successfully transmitted or the data frame is successfully transmitted by using the wireless communication mode in power failure, selecting the communication mode to transmit the SOF data frame according to a default probability of 2:1 (namely, the ratio of the probability of selecting the wireless communication mode to the probability of using the PLC communication mode is 2:1), and then executing the step S109.
S109, the STA station records the transmission log of the data frame transmitted this time.
please refer to fig. 9.
further, the step S5 specifically includes the following steps:
S501, judging current retransmission times
S502, if the current retransmission times is 0, the STA station judges and retransmits for the 1 st time according to the power failure condition, the sending mode and whether the message is received or not;
S503, if the current retransmission times is 1, the STA station judges and retransmits for the 2 nd time according to the power failure condition, the sending mode and whether the message is received or not;
S504, if the current retransmission times is 2, the STA station judges and retransmits for the 3 rd time according to the power failure condition, the sending mode and whether the message is received or not;
and S505, if the current retransmission times is 3 or more, the retransmission fails, and the program is ended.
Please refer to fig. 10.
Further, the step S502 specifically includes the following steps:
s5021, judging whether power is cut off currently;
s5022, if power failure does not occur currently, a PLC mode is selected to send data frames;
s5023, judging whether information is received from a channel or not if power is cut off currently;
s5024, if the information is received, selecting the communication mode of the last transmission to send the data frame; inquiring the communication mode of the last transmission log, and transmitting the data frame in the communication mode;
S5025, if the information is not received, whether the PLC is used for sending the data frame at the last time is detected;
S5026, if the PLC is used last time, selecting a wireless communication mode according to the probability of 2/3;
and S5027, if the PLC is not used last time, selecting the PLC or the wireless communication as a communication mode according to equal probability.
Please refer to fig. 11.
Further, the step S503 specifically includes the following steps:
S5031, judging whether power failure occurs at present;
s5032, if the power failure does not occur, judging whether the PLC is selected to send the data frame in the previous two times;
S5033, if the PLC is selected in the first two times, the wireless communication mode is selected to send the data frame;
S5034, if the first two times are not both PLC-selecting, selecting a PLC mode to send a data frame;
s5035, if the power failure occurs, judging whether the information is received from the channel;
S5036, if the information is received, selecting the last communication mode to transmit the data frame; that is, a communication mode of inquiring the last transmission log, and transmitting the data frame in the communication mode.
S5037, if the information is not received, detecting whether the PLC is used for sending the data frame last time;
s5038, if the PLC is used last time, selecting a wireless communication mode according to the probability of 2/3;
s5039, if the PLC is not used last time, judging whether the wireless communication mode is selected for sending the data frame in the previous two times;
s50310, if the wireless communication mode is selected in the first two times, the PLC mode is selected to send the data frame;
S50311, if the wireless communication mode is not selected in the first two times, selecting the PLC or the wireless communication as the communication mode with equal probability.
Please refer to fig. 12.
Further, the step S504 specifically includes the following steps:
s5041, judging whether power failure occurs currently;
S5042, if no power failure exists at present, judging whether the PLC is selected to send the data frame in the previous three times or not;
S5043, if the PLC is selected in the first three times, selecting a wireless communication mode;
S5044, if the PLC is not selected in the first three times, selecting a PLC mode;
S5045, if the power failure is present, judging whether information is received from the channel;
s5046, if the information is received, selecting the last communication mode to transmit the data frame; inquiring the communication mode of the last transmission log, and transmitting the data frame in the communication mode;
S5047, if the information is not received, whether the PLC is used for sending the data frame last time is detected;
S5048, if the PLC is used last time, selecting a wireless communication mode according to the probability of 2/3;
S5049, if the PLC was not used last time, selecting the PLC or the wireless communication mode with equal probability and transmitting the data frame.
in summary, the communication mode selection method for the dual-mode communication network provided by the embodiment has the following two advantages:
(1) When the STA station transmits the data frame, the reliability of transmission is increased.
after the STA station sends the SOF data frame to the CCO station, the STA station needs to wait for the CCO to reply the ACK frame, if power failure is caused by damage of the PLC link, the PLC link can not be used, the SOF data frame can not be sent to the CCO station through the PLC link, and the STA station only waits for overtime retransmission of data, so that a large amount of time is wasted. The problem can be effectively solved by introducing a mode selection mechanism based on the power failure condition and the historical information, and the transmission mode is selected through the power failure condition and the historical information, so that the STA station can select a more effective communication mode to transmit the data frame with high probability, and the transmission reliability is improved.
(2) when the STA station retransmits the data frame, the transmission overhead is effectively reduced, and the average delay of the data frame is reduced.
when the STA retransmission timer overflows, the STA station will start retransmission without receiving the ACK frame from the CCO station. When retransmission is performed, if the reason for the data frame transmission failure is not comprehensively judged, the transmission failure may still occur after three times of retransmission, and the STA station wastes a large amount of time and increases a large amount of transmission overhead. The problem can be effectively solved by introducing 'selecting the retransmission mode based on various information', and the STA station can select a more effective communication mode to transmit the data frame at a high probability by comprehensively judging three conditions of power failure condition, transmission mode and whether the information is received, so that the transmission overhead is effectively reduced, and the average delay of the data frame is reduced.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A method for selecting a communication mode of a dual-mode communication network, comprising the steps of:
Selecting a mode for sending a data frame according to the power failure condition and the historical information;
the STA station sends a data frame to the CCO station;
detecting whether an ACK frame of the CCO station is received before a retransmission timer overflows;
if the ACK frame is not received, selecting a retransmission mode according to various information; the various information includes power outage status, transmission mode, and whether information is received.
2. the communication mode selection method of a dual-mode communication network as claimed in claim 1, wherein after detecting whether the ACK frame of the CCO station is received before the retransmission timer overflows, the method further comprises the following steps:
And if the ACK frame is received, the communication is finished.
3. The method as claimed in claim 1, wherein the method for selecting a data frame transmission mode according to the power outage condition and the history information comprises the following steps:
The STA site records a transmission log transmitted last time, wherein the transmission log comprises a power failure state, a communication mode and a transmission result;
before sending the SOF data frame, the STA station firstly checks whether the current station is in a power failure state;
If the current state is not in a power failure state, selecting a broadband PLC mode to send a data frame; the STA station records a transmission log of the data frame transmitted this time.
4. a communication mode selection method for a dual mode communication network as claimed in claim 3, wherein said STA station first checks whether it is currently in a power-off state before transmitting SOF data frames, and thereafter further comprising the steps of:
if the current state is in a power failure state, selecting a communication mode for sending the SOF data frame according to the last transmission log;
if the transmission log is that the broadband PLC is used for successfully transmitting the data frame without power failure, selecting a broadband PLC mode to transmit the SOF data frame;
If the transmission log is that the broadband PLC is used for successfully transmitting the data frame when power is cut off, the mode of the broadband PLC is selected to transmit the SOF data frame, and then the STA station records the transmission log of the data frame transmitted this time;
If the transmission log is that the wireless communication mode is used for successfully transmitting the data frame without power failure, the communication mode is selected to transmit the SOF data frame according to equal probability, and then the STA station records the transmission log of the data frame transmitted this time;
If the transmission log indicates that the data frame is not successfully transmitted or the wireless communication mode is used for successfully transmitting the data frame during power failure, selecting the communication mode to transmit the SOF data frame according to a probability ratio of 2:1, wherein the probability ratio is the ratio of the probability of selecting the wireless communication mode and the PLC mode; the STA station then records a transmission log of this time the data frame is transmitted.
5. The communication mode selection method of a dual-mode communication network as claimed in claim 4, wherein said selecting a retransmission mode based on a plurality of information specifically comprises the steps of:
judging the current retransmission times;
if the current retransmission times is 0, the STA station judges whether to receive the message according to the power failure condition, the sending mode and the first retransmission time;
if the current retransmission times is 1, the STA station judges whether to receive the message according to the power failure condition, the sending mode and the condition and then performs the 2 nd retransmission;
if the current retransmission times is 2, the STA station judges whether to receive the message according to the power failure condition, the sending mode and the third aspect and then performs the 3 rd retransmission;
if the current retransmission number is 3 or more, the retransmission fails and the procedure ends.
6. the communication mode selection method of a dual-mode communication network according to claim 5, wherein the STA station performs retransmission for the 1 st time after determining according to the power outage condition, the transmission mode and whether the STA station receives the message, specifically comprising the following steps:
judging whether power is cut off at present;
If the power is not cut off at present, a PLC mode is selected to send the data frame;
if the power is cut off currently, judging whether the information is received from the channel;
if the information is received, selecting the communication mode of the last transmission to transmit the data frame;
If the information is not received, detecting whether the PLC is used for sending the data frame last time;
selecting a wireless communication mode with a probability of 2/3 if the last time the PLC was used;
If the PLC is not used last time, the PLC or the wireless communication is selected as the communication mode with equal probability.
7. The communication mode selection method of a dual-mode communication network according to claim 5, wherein the STA station performs the 2 nd retransmission after determining according to the power outage condition, the transmission mode and whether the STA station receives the message, specifically comprising the following steps:
judging whether power is cut off at present;
If no power failure occurs, judging whether the PLC is selected to transmit the data frame in the previous two times or not;
if the PLC is selected in the first two times, the wireless communication mode is selected to send the data frame;
if the PLC is not selected in the first two times, the PLC mode is selected to send the data frame;
If the power failure occurs, judging whether the information is received from the channel;
if the information is received, selecting the communication mode of the last transmission to transmit the data frame;
if the information is not received, detecting whether the PLC is used for sending the data frame last time;
selecting a wireless communication mode with a probability of 2/3 if the last time the PLC was used;
if the PLC is not used in the last time, judging whether the wireless communication mode is selected to send the data frame in the previous two times or not;
If the wireless communication mode is selected in the first two times, a PLC mode is selected to send the data frame;
if the wireless communication mode is not selected in the first two times, the PLC or the wireless communication is selected as the communication mode with equal probability.
8. the communication mode selection method of a dual-mode communication network according to claim 5, wherein the STA station performs the 3 rd retransmission after determining according to the power outage condition, the transmission mode and whether the message is received, specifically comprising the following steps:
Judging whether power is cut off at present;
if no power failure exists currently, judging whether the PLC is selected to transmit the data frame in the previous three times or not;
If the PLC is selected in the first three times, selecting a wireless communication mode;
If the PLC is not selected in the first three times, the PLC mode is selected;
if the current power failure is power failure, judging whether the information is received from the channel;
If the information is received, selecting the communication mode of the last transmission to transmit the data frame;
if the information is not received, detecting whether the PLC is used for sending the data frame last time;
selecting a wireless communication mode with a probability of 2/3 if the last time the PLC was used;
if the PLC is not used last time, the PLC or the wireless communication mode is selected with equal probability to transmit the data frame.
9. a communication mode selection method for a dual-mode communication network according to any of claims 1 to 8, wherein the wireless communication is a Lora communication.
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