CN111200858A - Networking scheme of dual-mode hybrid network based on broadband carrier and narrowband wireless - Google Patents
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Abstract
Based on a networking scheme of a dual-mode hybrid network of broadband carrier waves and narrowband wireless, the intelligent electric meter nodes adopt a white list system to access the network; the broadband carrier single-mode sensor node and the dual-mode sensor node apply for network access in a mode of sending associated messages to a network main node; when a narrow-band wireless single-mode sensor node accesses a network, monitoring a wireless beacon signal sent by a dual-mode communication node in the network; after the wireless beacon signal is correctly received, competing to send a network access application signal; the relay node forwards the network access application signal to a network main node; after receiving the network access application signal, the network master node sends a network access agreement signal to the relay node; after receiving the network access agreement signal, the relay node forwards the network access agreement signal to the narrow-band wireless single-mode sensor node applying for network access; and the narrow-band wireless single-mode sensor node applying for network access completes network access after receiving the network access agreement signal. The invention can meet the requirements of mixed networking and high-efficiency communication of devices with different forms and communication capabilities.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a networking scheme of a power line broadband carrier and narrowband wireless dual-mode hybrid network.
Background
The ubiquitous power internet of things is a novel intelligent service system which applies modern information technologies and communication technologies such as mobile interconnection, artificial intelligence and the like, realizes the interconnection of everything and man-machine interaction in all links of a power system, and has the characteristics of comprehensive state sensing, efficient information processing and convenient and flexible application. The system is provided with sensor equipment with various forms and purposes and is used for monitoring and detecting the states of various electric equipment in the system. In a traditional physical network, a narrowband wireless communication technology based on an IEEE 802.15.4 standard is generally used for transmitting sensor data, such as ZigBee and LPWAN, but when a power sensor is deployed indoors, between high-rise buildings or in a shielded place, the transmission distance of a wireless signal is greatly limited, and a communication isolated point or an islanding phenomenon easily occurs, so that the traditional narrowband wireless-based single-mode communication network scheme cannot completely realize effective communication of power sensor equipment in some deployment environments with relatively complex environments. If a narrow-band wireless technology can be added on the basis of a broadband carrier communication network of the existing electric meter centralized meter reading system, and the advantages of two communication technologies, namely power line broadband carrier and narrow-band wireless, are combined, the problem of information transmission of the power sensor equipment deployed indoors is expected to be solved. At present, devices using power line broadband carrier and narrowband wireless communication technologies mainly have three forms of a broadband carrier single mode, a narrowband wireless single mode and a broadband carrier and narrowband wireless dual mode, and a networking scheme capable of fusing differences among different communication means is designed for a hybrid network with the devices using the communication modes, so that the expansion of the communication functions of the smart meter centralized meter reading network from the traditional electric energy metering service to other non-metering services is realized, and the problem to be solved at present is urgently solved.
Disclosure of Invention
The invention aims to provide a networking scheme of a dual-mode hybrid network based on power line broadband carrier and narrowband wireless communication.
In order to achieve the purpose, the invention adopts the following technical solutions:
the networking scheme of the dual-mode hybrid network based on broadband carrier and narrowband wireless comprises a main node and slave nodes attached to the main node, wherein the slave nodes comprise an intelligent electric meter node, a broadband carrier single-mode sensor node, a narrowband wireless single-mode sensor node and a dual-mode sensor node:
after the network triggers the networking requirement, the network main node respectively executes the networking superframe on the broadband carrier communication channel and the narrowband wireless communication channel;
the intelligent electric meter nodes adopt a white list system to access the network;
the method comprises the steps that a broadband carrier single-mode sensor node and a dual-mode sensor node apply for network access in a mode of sending associated messages to a network main node, the network main node judges whether the number of nodes adopting a broadband carrier communication mode in the network reaches an upper limit value or not after receiving a network access application, if the number of the nodes does not reach the upper limit value, the sensor node initiating the network access application is allowed to access the network, and if not, the sensor node initiating the network access application is refused to access the network;
the network access process of the narrow-band wireless single-mode sensor node is as follows:
monitoring a wireless beacon signal sent by a dual-mode communication node in a network;
after the wireless beacon signal is correctly received, the narrowband wireless single-mode sensor node competitively sends a network access application signal on a CSMA time slot of a networking superframe of a narrowband wireless communication channel, selects a relay node from the dual-mode communication nodes which can correctly receive the signal of the relay node, and sends the network access application signal to the relay node;
the relay node forwards the network access application signal to a network main node;
after receiving the network access application signal, the network master node sends a network access agreement signal to the relay node;
after receiving the network access agreement signal, the relay node forwards the network access agreement signal to the narrow-band wireless single-mode sensor node applying for network access;
and the narrow-band wireless single-mode sensor node applying for network access completes network access after receiving the network access agreement signal.
Further, the selection mechanism of the relay node is as follows: and selecting the dual-mode communication node with the minimum carrier layer level number and the best signal receiving quality from the dual-mode communication nodes which can correctly receive the signals of the dual-mode communication node as a relay node.
Further, if the narrowband wireless single-mode sensor node applying for network access does not receive a network access agreement signal within a set time after sending the network access application, another dual-mode communication node is replaced as a relay node, and the network access application signal is continuously sent until the network access application signal is received or the sending times reach an upper limit.
Further, the networking superframe of the narrowband wireless communication channel comprises: the network comprises N + X beacon time slots and N + X CSMA time slots, wherein N is the number of the intelligent electric meters in a white list, and N + X represents an upper limit value of the number of the nodes of the network adopting a broadband carrier communication mode.
Further, the sending node of the wireless beacon signal is a dual-mode communication node which completes network access on the broadband carrier communication channel.
Furthermore, after the narrowband wireless single-mode sensor node is accessed to the network, signals of other nodes are not sent again, a signal transceiving mechanism is started only when the signals are required to be sent, and the narrowband wireless single-mode sensor node is in a dormant state in the rest time.
Further, after the narrowband wireless single-mode sensor node is accessed to the network, the step of sending the service data is as follows: monitoring wireless beacon signals sent by dual-mode communication nodes in a network, after the wireless beacon signals are correctly received, competitively sending service data signals on a CSMA time slot, selecting a relay node from the dual-mode communication nodes which can correctly receive the signals of the relay node, and sending the service data signals to the relay node for forwarding; and after receiving the receiving confirmation signal of the relay node, defaulting that the service data is successfully transmitted, and if the receiving confirmation signal is not received within the specified time, replacing the relay node and transmitting the service data signal until the receiving confirmation signal is received or the transmission time is overtime or the transmission frequency reaches the upper limit.
Further, after the dual-mode communication node accesses the network, the wireless beacon signal is periodically sent on the narrow-band wireless channel.
Further, after the dual-mode communication node accesses the network, the step of sending the service data is as follows: when a service data transmission requirement is generated, a transmission path is calculated through routing information of a broadband carrier channel, if a certain link on the transmission path has the simultaneous availability of a broadband carrier communication channel and a narrowband wireless communication channel, a CSMA channel monitoring mechanism on the two channels is started simultaneously, and a channel with a transmission opportunity appearing first is adopted for data signal transmission.
According to the technical scheme, the fully-connected carrier network is established under the existing broadband carrier communication protocol by utilizing the dual-mode communication nodes in the dual-mode hybrid network, the dual-mode communication nodes are taken as central access points, and the single-hop route between the dual-mode communication nodes and the narrowband wireless nodes is established by periodically sending the wireless beacon signals in turn, so that the dual-mode hybrid networking of broadband carrier and narrowband wireless is realized, and the problem of communication isolated points or islands at the narrowband wireless side is solved. The networking scheme of the invention can simplify the routing complexity of the narrow-band wireless side to the maximum extent, can add the communication function of non-metering service to the existing electric meter broadband carrier centralized-reading network, meets the requirements of mixed networking and high-efficiency communication of devices with different forms and communication capabilities, does not need to modify the infrastructure of the existing network, and has the advantages of low technical research and development difficulty, small market risk, low cost and the like.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic diagram of a routing architecture of a dual-mode hybrid network according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a time slot structure of a networking superframe on a narrowband wireless communication channel side according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a format of a beacon signal of a narrowband wireless communication side according to the present invention;
fig. 4 is a schematic diagram of a channel selection mechanism when a dual-mode communication node transmits service data according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned and other objects, features and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
Compared with a smart meter, the power sensor used in the power internet of things has the following distinguishing characteristics:
the energy supply modes are different: the intelligent electric meter is powered by a power line, and the power sensor is limited by the installation position, so that the power sensor does not necessarily have the condition of power supply by the power line, and some power sensors need to be powered by a built-in battery;
the communication means are different: the intelligent electric meters can communicate through power line carrier communication channels, and most of the intelligent electric meters can realize dual-mode communication of broadband carrier and narrowband wireless; the power sensor is limited by volume, cost and the like in different application scenes, and may only have a broadband carrier or narrowband wireless single-mode communication means;
the communication rates are different: the physical layer communication rate of the broadband carrier can reach Mbps, while the physical layer communication rate of the narrowband wireless carrier is only about several kbps or dozens of kbps generally;
the energy consumption levels are different: the intelligent electric meter is powered by a power line, so that the requirement on energy-saving design is low; for power sensors that use built-in batteries to supply power, it is desirable to minimize the power consumption of the device through a long-term sleep mechanism.
Fig. 1 is a schematic diagram of a dual-layer routing architecture for a dual-mode hybrid network including smart meters and power sensors. In addition to the network master node, the slave nodes in the dual mode hybrid network include the following four types: the intelligent electric meter node comprises an intelligent electric meter node with a broadband carrier and narrowband wireless dual-mode communication means, a broadband carrier single-mode sensor node with a broadband carrier single-mode communication means, a narrowband wireless single-mode sensor node with a narrowband wireless single-mode communication means, and a dual-mode sensor node with a broadband carrier and narrowband wireless dual-mode communication means. The nodes with the broadband carrier communication means, such as the intelligent electric meter node, the broadband carrier single-mode sensor node and the dual-mode sensor node, are all connected with the power line, and the narrow-band wireless sensor node with only the narrow-band wireless single-mode communication means is not connected with the power line and is powered by the built-in battery. The networking scheme of the dual-mode hybrid network of the embodiment is as follows:
after the network triggers the networking requirement, the network main node respectively executes the networking superframe on the broadband carrier communication channel and the narrowband wireless communication channel;
the intelligent electric meter adopts a white list system to access the network, namely a network main node stores an MAC address list of the intelligent electric meter in the local area, and only intelligent electric meter nodes on the white list are allowed to access the network in the networking process; and after receiving the association request message for applying network access, the network master node applies for the intelligent electric meters on the white list through network access.
For the power sensor adopting a broadband carrier communication mode (a broadband carrier single-mode sensor with a broadband carrier single-mode communication means and a dual-mode sensor with a broadband carrier and narrowband wireless dual-mode communication means), because the installation of the sensor has strong randomness, a white list network access mechanism is difficult to adopt, the node applies for network access by sending a correlation message to a network main node, and the correlation message of the power sensor carries the type of the device per se; after receiving a network access application of the power sensor adopting the broadband carrier communication mode, the network master node firstly judges whether the number of nodes adopting the broadband carrier communication mode in the network reaches an upper limit value, if not, the power sensor initiating the network access application is allowed to access the network, otherwise, the power sensor initiating the network access application is refused to access the network. And the network main node reserves space for each intelligent electric meter on the white list when the network initially runs so as to avoid the situation that the intelligent electric meters on the white list cannot be accessed to the network because the number of the network nodes reaches the upper limit value.
Table 1 is a list of definitions of associated packets to device types in the wideband carrier protocol of the present invention, where 8 device types are defined, and each device type is defined by signaling of 1 byte.
TABLE 1
For a power sensor adopting a narrow-band wireless single-mode communication mode (hereinafter referred to as a narrow-band wireless single-mode sensor), the network access process is as follows:
monitoring wireless beacon signals sent by dual-mode communication nodes (an intelligent electric meter node with a dual-mode communication means of broadband carrier and narrowband wireless, and a dual-mode sensor node with a dual-mode communication means of broadband carrier and narrowband wireless) in a network;
after monitoring and correctly receiving the wireless beacon signal, the narrowband wireless single-mode sensor node competitively sends an access application signal on a CSMA time slot of a networking superframe of a narrowband wireless communication channel, selects a node with the minimum carrier layer level and the best signal receiving quality from dual-mode communication nodes which can correctly receive the signal as a relay node of the node, and sends the access application signal to the relay node;
the relay node forwards the network access application signal to a network main node;
after receiving a network access application signal, the network master node sends a network access agreement signal to the relay node, wherein the network access agreement signal carries a TEI address which is distributed by the network master node for the narrow-band wireless single-mode sensor node applying for network access and is used for identifying the unique identity of the node in the network;
after receiving the network access agreement signal, the relay node uses a wireless communication channel to forward the network access agreement signal to the narrow-band wireless single-mode sensor node applying for network access on CSMA time slot of a networking superframe of the narrow-band wireless communication channel;
and the narrow-band wireless single-mode sensor node applying for network access completes network access after receiving the network access agreement signal.
If the narrowband wireless single-mode sensor node applying for network access does not receive a network access agreement signal within a set time after sending the network access application, replacing another dual-mode communication node as a relay node, continuing to send the network access application signal, and repeating the steps until the network access application signal is received or the sending times reach an upper limit (for example, 30 times).
In the conventional broadband carrier communication protocol, the length of the TEI address is 12 bits (the value range is 0-4095), the upper limit value of the number of nodes of the broadband carrier network is about 1000 generally, so that about 1000 nodes (broadband carrier single-mode, broadband carrier and narrowband wireless dual-mode) with carrier communication capacity can be allowed to access the network in the dual-mode hybrid network, and about 3000 narrowband wireless single-mode nodes can be allowed to access the network. More specifically, in the TEI address allocation process, the network master node divides the TEI address into 5 segments, where 0 is the TEI address of the network master node by default, [1, N ] is allocated to the smart meter in the white list, [ N +1, N + X ] is allocated to the broadband carrier single-mode, broadband carrier and narrowband wireless dual-mode node, [ N + X +1, 4094] is allocated to the narrowband wireless single-mode node, and 4095 is the whole network broadcast address.
Fig. 2 is a schematic diagram of a time slot structure of a networked superframe of a narrowband wireless communication channel. As shown in fig. 1, the superframe includes two types of time slots: n + X beacon slots and N + X CSMA slots; n is the number of the intelligent electric meters in the white list, and N + X represents the upper limit value of the number of the nodes of the network adopting the broadband carrier communication mode, which is specified by the broadband carrier protocol, wherein the upper limit value may be different in the broadband carrier protocols specified by different units, and is determined by each protocol formulation unit according to the requirements.
The beacon slot is used for transmitting network signaling information with a fixed content length, and by default, the beacon signal is transmitted by using the waveform which is the lowest in rate and the most reliable in the narrowband wireless communication physical layer, and the length of the beacon slot is determined by the physical layer waveform used by the wireless channel side. The length of the CSMA slot defaults to an integer multiple of the length of the beacon slot, and defaults to 20 times. Based on the TEI address allocation condition and the NTB value of the broadband carrier side, the allocation mechanism of the beacon time slot in the networking superframe of the wireless communication channel is as follows: the Y-th beacon time slot in the superframe is fixedly allocated to the node with the TEI value equal to Y, and if the TEI value corresponding to a certain beacon time slot is not allocated, the network main node replaces the TEI value to transmit the beacon signal. The time reference of the superframe of the wireless side is completely consistent with that of the carrier side, so that all wireless nodes can still correctly maintain the signal transceiving time sequence of the superframe structure when the wireless side has communication isolated points or isolated islands.
Fig. 3 is a schematic diagram of a format of a wireless beacon signal, which includes a synchronization header, signaling content and CRC (parity bits) as shown in fig. 3. The signaling content comprises a network identifier, a sending node TEI and a sending node carrier layer level. The network main node uses the network identification field to uniquely identify the identity of the carrier network, and the network identification values of the wireless side network and the broadband carrier side network are kept consistent in the hybrid networking network. The terminal equipment identification value (TEI for short) is used for indicating the identity of the node in the network and is allocated by the network main node, the wireless beacon signal transmitting node of the invention must be a dual-mode communication node which completes network access on the broadband carrier side, therefore, the transmitting node TEI in the wireless beacon signal represents the TEI value allocated to the node by the main node when the transmitting node accesses the network on the broadband carrier side. The transmitting node carrier level number is used to identify the number of transmission routing layers between the node and the network master node, with a smaller value meaning that the node is closer to the network master node.
For nodes (intelligent electric meter nodes, broadband carrier single-mode sensor nodes and dual-mode sensor nodes) accessing the network through a broadband carrier channel, when the network access is allowed, a network main node allocates unique terminal equipment identification values (TEI for short) to the nodes, and the value range is 1 to N + X. Meanwhile, the network master node broadcasts a network reference time value (NTB for short) through the carrier beacon signal, so as to continuously realize the time synchronization and alignment of the network master node and the network carrier node.
For the narrow-band wireless single-mode sensor node, because a built-in battery is adopted for supplying power, in order to reduce energy consumption, the narrow-band wireless single-mode sensor node after being connected to the network cannot relay and send signals of other nodes, a signal receiving and sending mechanism is started only when the signals are required to be sent, and the narrow-band wireless single-mode sensor node is in a dormant state in the rest time. The dual mode sensor node may act as a relay node.
After network access, when the narrowband wireless single-mode sensor node sends service data, the sending mechanism of the service signal is the same as that of a network access application signal, the wireless beacon signal sent by a dual-mode node in the network is monitored, after the wireless beacon signal is correctly received, the service data signal is sent in a competition mode on a CSMA time slot, a node with the minimum carrier layer level and the best signal receiving quality is selected from the dual-mode communication nodes which can correctly receive the signal of the node as a relay node, and the service data signal is sent to the relay node for forwarding; and after receiving the receiving confirmation signal of the relay node, the service data is defaulted to be successfully sent. Otherwise, if the reception acknowledgement signal is not received within the specified time after the service signal is transmitted, the relay node is replaced and the signal transmission is attempted again until the reception acknowledgement signal is received, or the data is overtime, or the number of transmissions reaches the upper limit, for example, 10 times. After receiving the service data signal sent by the narrowband wireless single-mode sensor node, the relay dual-mode node forwards the service data to the network main node based on the routing information of the relay dual-mode node.
After the dual-mode communication nodes are accessed to the network, wireless beacon signals are periodically sent between the dual-mode communication nodes on a narrow-band wireless channel to discover a wireless side 1-hop neighbor node; and route maintenance on the carrier side is realized between the dual-mode communication nodes by adopting a broadband carrier communication protocol. As shown in fig. 4, when a dual-mode communication node generates a service data transmission demand, a transmission path is first calculated through routing information of a broadband carrier channel (a conventional method for a calculator of the transmission path is not an innovative point of the present invention, and is not described here again), if a certain link of the transmission path has a broadband carrier and a narrowband radio simultaneously available, a CSMA channel monitoring mechanism on two channels is simultaneously started, and which channel has a transmitter first, the channel is selected for data signal transmission, so as to achieve load balancing of the two channels.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (9)
1. The networking scheme of the dual-mode hybrid network based on the broadband carrier and the narrowband radio is characterized in that: the network comprises a main node and slave nodes attached to the main node, wherein the slave nodes comprise an intelligent electric meter node, a broadband carrier single-mode sensor node, a narrowband wireless single-mode sensor node and a dual-mode sensor node:
after the network triggers the networking requirement, the network main node respectively executes the networking superframe on the broadband carrier communication channel and the narrowband wireless communication channel;
the intelligent electric meter nodes adopt a white list system to access the network;
the method comprises the steps that a broadband carrier single-mode sensor node and a dual-mode sensor node apply for network access in a mode of sending associated messages to a network main node, the network main node judges whether the number of nodes adopting a broadband carrier communication mode in the network reaches an upper limit value or not after receiving a network access application, if the number of the nodes does not reach the upper limit value, the sensor node initiating the network access application is allowed to access the network, and if not, the sensor node initiating the network access application is refused to access the network;
the network access process of the narrow-band wireless single-mode sensor node is as follows:
monitoring a wireless beacon signal sent by a dual-mode communication node in a network;
after the wireless beacon signal is correctly received, the narrowband wireless single-mode sensor node competitively sends a network access application signal on a CSMA time slot of a networking superframe of a narrowband wireless communication channel, selects a relay node from the dual-mode communication nodes which can correctly receive the signal of the relay node, and sends the network access application signal to the relay node;
the relay node forwards the network access application signal to a network main node;
after receiving the network access application signal, the network master node sends a network access agreement signal to the relay node;
after receiving the network access agreement signal, the relay node forwards the network access agreement signal to the narrow-band wireless single-mode sensor node applying for network access;
and the narrow-band wireless single-mode sensor node applying for network access completes network access after receiving the network access agreement signal.
2. The networking scheme for a dual-mode hybrid network based on broadband carrier and narrowband wireless of claim 1, wherein: the selection mechanism of the relay node is as follows: and selecting the dual-mode communication node with the minimum carrier layer level number and the best signal receiving quality from the dual-mode communication nodes which can correctly receive the signals of the dual-mode communication node as a relay node.
3. The networking scheme for a dual-mode hybrid network based on broadband carrier and narrowband wireless of claim 1, wherein: and if the narrow-band wireless single-mode sensor node applying for network access does not receive a network access agreement signal within the set time after sending the network access application, replacing another dual-mode communication node as a relay node, and continuing to send the network access application signal until the network access application signal is received or the sending times reach the upper limit.
4. The networking scheme for a dual-mode hybrid network based on broadband carrier and narrowband wireless of claim 1, wherein: the networking superframe of the narrowband wireless communication channel comprises: the network comprises N + X beacon time slots and N + X CSMA time slots, wherein N is the number of the intelligent electric meters in a white list, and N + X represents an upper limit value of the number of the nodes of the network adopting a broadband carrier communication mode.
5. The networking scheme for a dual-mode hybrid network based on broadband carrier and narrowband wireless of claim 1, wherein: the sending node of the wireless beacon signal is a dual-mode communication node which completes network access on a broadband carrier communication channel.
6. The networking scheme for a dual-mode hybrid network based on broadband carrier and narrowband wireless of claim 1, wherein: after the narrow-band wireless single-mode sensor node is connected to the network, signals of other nodes are not sent secondarily, a signal receiving and sending mechanism is started only when the signals are needed to be sent, and the narrow-band wireless single-mode sensor node is in a dormant state in the rest time.
7. A networking scheme for a dual mode hybrid network based on broadband carrier and narrowband radio according to any of claims 1 to 5, characterized in that: after the narrowband wireless single-mode sensor node is accessed to the network, the step of sending the service data is as follows: monitoring wireless beacon signals sent by dual-mode communication nodes in a network, after the wireless beacon signals are correctly received, competitively sending service data signals on a CSMA time slot, selecting a relay node from the dual-mode communication nodes which can correctly receive the signals of the relay node, and sending the service data signals to the relay node for forwarding; and after receiving the receiving confirmation signal of the relay node, defaulting that the service data is successfully transmitted, and if the receiving confirmation signal is not received within the specified time, replacing the relay node and transmitting the service data signal until the receiving confirmation signal is received or the transmission time is overtime or the transmission frequency reaches the upper limit.
8. A networking scheme for a dual mode hybrid network based on broadband carrier and narrowband radio according to any of claims 1 to 5, characterized in that: after the dual-mode communication node accesses the network, a wireless beacon signal is periodically sent on a narrow-band wireless channel.
9. A networking scheme for a dual mode hybrid network based on broadband carrier and narrowband radio according to any of claims 1 to 5, characterized in that: after the dual-mode communication node accesses the network, the step of sending the service data is as follows: when a service data transmission requirement is generated, a transmission path is calculated through routing information of a broadband carrier channel, if a certain link on the transmission path has the simultaneous availability of a broadband carrier communication channel and a narrowband wireless communication channel, a CSMA channel monitoring mechanism on the two channels is started simultaneously, and a channel with a transmission opportunity appearing first is adopted for data signal transmission.
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Cited By (9)
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| CN112767669A (en) * | 2020-12-30 | 2021-05-07 | 国网北京市电力公司 | Data transmission method and device |
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