CN112929060B - Fishery ship rescue communication system and method - Google Patents
Fishery ship rescue communication system and method Download PDFInfo
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- CN112929060B CN112929060B CN202110148202.0A CN202110148202A CN112929060B CN 112929060 B CN112929060 B CN 112929060B CN 202110148202 A CN202110148202 A CN 202110148202A CN 112929060 B CN112929060 B CN 112929060B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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Abstract
The invention relates to a fishery ship rescue communication system and a fishery ship rescue communication method, which comprise the following steps: establishing multi-node communication, and realizing the gain of communication information by sharing respective information to obtain cooperative communication information; the cooperative communication information forms transmission data through channel coding, and the multiple nodes are connected to the rescue platform through effective links; the salvation platform generates salvation information by analyzing the historical operation information of the target ship, and carries out synchronous data exchange on the salvation information through a relay protocol.
Description
Technical Field
The invention relates to a fishery ship rescue communication system, in particular to a fishery ship rescue communication system and a fishery ship rescue communication method.
Background
With the rapid development of wireless communication technology, people in life have increasingly high requirements on wireless transmission technology. The traditional single antenna transmission technology cannot meet the requirements of people on high efficiency and low time delay of communication services. At present, mimo is one of the key technologies of the fifth generation mobile communication system due to its advantages of high spectrum efficiency, high data transmission efficiency, high reliability, high coverage rate, low time delay, etc. The basic principle of the multiple-input multiple-output technology is as follows: at a sending end, the information bits are converted in a serial-parallel mode, and information transmission is carried out on a plurality of transmitting antennas in parallel. At the receiving end, the purpose of diversity is achieved by configuring a plurality of receiving antennas. According to the transmission structure, the classical mimo technology used in 5G communication is mainly classified into two types: spatial multiplexing and spatial diversity. The basic principle of the spatial multiplexing technique is to transmit different bit information at different transmit antennas, thereby maximizing the transmission rate.
In order to ensure the rapidity of fishery ship communication transmission, a system matched with the fishery ship communication transmission system needs to be developed for control, multi-node communication is established, communication information gain is achieved by sharing respective information, transmission data are formed through channel coding, signal interference can be reduced through distributed beam forming, pure signals are obtained, the transmission rate of the communication system is optimized, accurate control is achieved on the fishery illegal ship identification and troubleshooting system, and the problem to be solved urgently is solved.
Disclosure of Invention
The invention overcomes the defects of the prior art and provides a fishery ship rescue communication system and a fishery ship rescue communication method.
In order to achieve the purpose, the invention adopts the technical scheme that: a fishery vessel rescue communication method comprising:
establishing multi-node communication, and realizing the gain of communication information by sharing respective information to obtain cooperative communication information;
the cooperative communication information forms transmission data through channel coding,
the multiple nodes are connected to the rescue platform through effective links;
the salvation platform generates salvation information by analyzing the historical operation information of the target ship,
and carrying out synchronous data exchange on the rescue information through a relay protocol.
In a preferred embodiment of the present invention, an incident signal is received, and a reflected signal of the incident signal is calculated;
adjusting the phase and angle of the reflected signal according to the electromagnetic characteristics of the reflected signal,
superposing radio frequency signals of the reflected signals to obtain result information;
and transmitting the result information to the rescue platform.
In a preferred embodiment of the present invention, the performing synchronous data exchange on the rescue information through a relay protocol specifically includes:
receiving the node signal, decoding the signal-encoded transmission data,
carrying out beam forming on the signal wave after decoding to obtain a pure signal;
the clean signals are coupled through a high-speed cooperative link for data exchange.
In a preferred embodiment of the present invention, N nodes transmit N data streams, and perform precoding on the data streams to form space division multiplexing;
transmitting N data streams by using space division multiplexing, and obtaining node signals by transmitting beam forming;
dividing a node signal into a plurality of resource blocks, wherein each resource block comprises an orthogonal subcarrier signal and a subcarrier interval;
different subcarriers are combined by a carrier aggregation method.
In a preferred embodiment of the present invention, the pre-coding is split into digital domain pre-coding and analog domain pre-coding, wherein the digital domain pre-coding is directly implemented at baseband frequency by programming; the analog domain precoding is realized under the radio frequency through a phase-shifting network circuit; and the signals in the phase-shifting network circuit are subjected to frequency mixing operation after the phase shifting of the radio frequency front end is finished.
In a preferred embodiment of the present invention, the relay protocol includes a full duplex mode and a half duplex mode, when the node sends the useful signal, the relay works in the full duplex mode, and the relay sends the interference signal while receiving the node signal;
when the relay sends a useful signal, the relay works in a half-duplex mode, meanwhile, the node sends an interference signal, and the full-duplex mode and the half-duplex mode can be freely switched.
In a preferred embodiment of the invention, the corresponding link is selected according to the shared information, and then the corresponding base station serial number is sent;
judging whether the signal coding rate is greater than a preset rate or not according to the link selection;
if so, the relay remains silent;
if the signal-to-noise ratio is smaller than the preset value, the relay performs full-duplex and half-duplex switching according to the signal-to-noise ratio of the link.
The second aspect of the present invention also provides a fishery vessel rescue communication system, comprising: the fishery ship rescue communication method comprises a memory and a processor, wherein the memory comprises fishery ship rescue communication method programs, and the fishery ship rescue communication method programs realize the following steps when being executed by the processor:
establishing multi-node communication, and realizing the gain of communication information by sharing respective information to obtain cooperative communication information;
the cooperative communication information forms transmission data through channel coding,
the multiple nodes are connected to the rescue platform through effective links;
the salvation platform generates salvation information by analyzing the historical operation information of the target ship,
and carrying out synchronous data exchange on the rescue information through a relay protocol.
In a preferred embodiment of the present invention, the performing synchronous data exchange on the rescue information through a relay protocol specifically includes:
receiving the node signal, decoding the signal-encoded transmission data,
carrying out beam forming on the signal wave after decoding to obtain a pure signal;
the clean signals are coupled through a high-speed cooperative link for data exchange.
In a preferred embodiment of the present invention, N nodes transmit N data streams, and perform precoding on the data streams to form space division multiplexing;
transmitting N data streams by using space division multiplexing, and obtaining node signals by transmitting beam forming;
dividing a node signal into a plurality of resource blocks, wherein each resource block comprises an orthogonal subcarrier signal and a subcarrier interval;
different subcarriers are combined by a carrier aggregation method.
The invention solves the defects in the background technology, and has the following beneficial effects:
(1) N data streams are transmitted by utilizing space division multiplexing, node signals are divided into a plurality of resource blocks through transmitting beam forming, different subcarriers are combined through a carrier aggregation method, the signal bandwidth on each subcarrier is reduced, the channel response is flat and quick, and the signal quality deterioration brought by radio frequency is reduced.
(2) The nodes can be base stations or antennas, and in an area with dense layout of multiple base stations, the cooperative links can realize data synchronization, so that multiple base stations cooperate, signal interference can be reduced through distributed beam forming, pure signals can be obtained, and the transmission rate of a communication system is optimized.
(3) The whole network or at least one group of base stations in the network can jointly send or receive data of a plurality of ship users to simulate the transmission process of a multi-input multi-output channel, and the multi-input multi-output cooperation converts the multi-base station network into the multi-user channel, so that the receiving performance of edge users is improved, the throughput of the system is improved, and in the system, beam forming can realize low computation complexity and high spectrum efficiency.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 shows a flow chart of a fishery vessel rescue communication method of the present invention;
FIG. 2 shows a flow chart of an information transfer method;
FIG. 3 shows a flow chart of a method of data exchange;
FIG. 4 shows a flow chart of a data processing method;
FIG. 5 shows a flow chart of a repeater operation method;
FIG. 6 shows a block diagram of a fishery vessel rescue communication system
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
Fig. 1 shows a flow chart of a fishery vessel rescue communication method of the present invention.
As shown in fig. 1, a first aspect of the present invention provides a fishery vessel rescue communication method, including:
s102, establishing multi-node communication, and realizing gain of communication information by sharing respective information to obtain cooperative communication information;
s104, the cooperative communication information forms transmission data through channel coding,
s106, connecting multiple nodes to a rescue platform through effective links;
s108, the salvation platform generates salvation information by analyzing the historical operation information of the target ship,
and S110, carrying out synchronous data exchange on the rescue information through a relay protocol.
It should be noted that the node can be a base station or an antenna, and in an area where multiple base stations are densely arranged, the cooperative link can achieve data synchronization, so that multiple base stations cooperate, and through distributed beam forming, signal interference can be reduced, a pure signal can be obtained, and the transmission rate of the communication system is optimized.
As shown in fig. 2, the present invention discloses a flow chart of an information transmission method;
according to the embodiment of the invention, S202, receiving an incident signal, and calculating a reflected signal of the incident signal;
s204, adjusting the phase and angle of the reflected signal according to the electromagnetic property of the reflected signal,
s206, superposing the radio frequency signals of the reflected signals to obtain result information;
and S208, transmitting the result information to the rescue platform.
It should be noted that the entire network or at least one group of base stations in the network may jointly transmit or receive data of multiple ship users to simulate the transmission process of the multiple-input multiple-output channel, and the multiple-input multiple-output cooperation converts the multiple-base-station network into the multiple-user channel, so as to improve the receiving performance of the edge users and improve the throughput of the system.
As shown in FIG. 3, the present invention discloses a flow chart of a data exchange method;
according to the embodiment of the invention, the method for carrying out synchronous data exchange on the rescue information through the relay protocol specifically comprises the following steps:
s302, receiving the node signal, decoding the signal-encoded transmission data,
s304, carrying out wave beam forming on the signal wave after decoding to obtain a pure signal;
and S306, coupling the pure signals through a high-speed cooperative link for data exchange.
As shown in FIG. 4, the present invention discloses a flow chart of a data processing method;
according to the embodiment of the invention, S402, N nodes send N data streams, and the data streams are precoded to form space division multiplexing;
s404, transmitting N data streams by using space division multiplexing, and obtaining node signals by transmitting beam forming;
s406, dividing the node signal into a plurality of resource blocks, wherein each resource block comprises an orthogonal subcarrier signal and a subcarrier interval;
and S408, combining different subcarriers by a carrier aggregation method.
It should be noted that N data streams are transmitted by using space division multiplexing, a node signal is divided into a plurality of resource blocks by transmit beamforming, different subcarriers are combined by a carrier aggregation method, so that signal bandwidth reduction on each subcarrier is realized, channel response is flat and fast, and signal quality deterioration caused by radio frequency is reduced.
According to the embodiment of the invention, the pre-coding is split into digital domain pre-coding and analog domain pre-coding, wherein the digital domain pre-coding is directly realized by programming at baseband frequency; the analog domain precoding is realized under the radio frequency through a phase-shifting network circuit; and the signals in the phase-shifting network circuit are subjected to frequency mixing operation after the phase shifting of the radio frequency front end is finished.
According to the embodiment of the invention, the relay protocol comprises a full-duplex mode and a half-duplex mode, when the node sends a useful signal, the relay works in the full-duplex mode, and the relay sends an interference signal while receiving the node signal;
when the relay sends a useful signal, the relay works in a half-duplex mode, meanwhile, the node sends an interference signal, and the full-duplex mode and the half-duplex mode can be freely switched.
As shown in fig. 5, the present invention discloses a flow chart of the working method of the repeater;
according to the embodiment of the invention, S502, the corresponding link is selected according to the shared information, and then the corresponding base station serial number is sent;
s504, judging whether the signal coding rate is greater than a preset rate according to link selection;
s506, if the number of the relay nodes is larger than the preset value, the relay nodes keep silent;
and S508, if the signal to noise ratio is smaller than the preset value, the relay performs full duplex and half duplex switching according to the signal to noise ratio of the link.
As shown in fig. 6, the invention discloses a fishery vessel rescue communication system block diagram;
the second aspect of the present invention also provides a fishery vessel rescue communication system 6, the system 6 comprising: a memory 61 and a processor 62, wherein the memory includes a fishery vessel rescue communication method program, and when the fishery vessel rescue communication method program is executed by the processor, the following steps are implemented:
establishing multi-node communication, and realizing gain of communication information by sharing respective information to obtain cooperative communication information;
the cooperative communication information forms transmission data through channel coding,
the multiple nodes are connected to the rescue platform through effective links;
the salvation platform generates salvation information by analyzing the historical operation information of the target ship,
and carrying out synchronous data exchange on the rescue information through a relay protocol.
According to the embodiment of the invention, the method for carrying out synchronous data exchange on the rescue information through the relay protocol specifically comprises the following steps:
receiving the node signal, decoding the signal-encoded transmission data,
carrying out wave beam forming on the signal wave after decoding to obtain a pure signal;
the clean signals are coupled through a high-speed cooperative link for data exchange.
According to the embodiment of the invention, N nodes send N data streams, and carry out precoding on the data streams to form space division multiplexing;
transmitting N data streams by using space division multiplexing, and obtaining node signals by transmitting beam forming;
dividing a node signal into a plurality of resource blocks, wherein each resource block comprises an orthogonal subcarrier signal and a subcarrier interval;
different subcarriers are combined by a carrier aggregation method.
According to the embodiment of the invention, the pre-coding is split into digital domain pre-coding and analog domain pre-coding, wherein the digital domain pre-coding is directly realized by programming under baseband frequency; the analog domain precoding is realized under the radio frequency through a phase-shifting network circuit; and signals in the phase-shifting network circuit are subjected to frequency mixing operation after phase shifting is finished at the radio frequency front end.
According to the embodiment of the invention, the relay protocol comprises a full-duplex mode and a half-duplex mode, when the node sends a useful signal, the relay works in the full-duplex mode, and the relay sends an interference signal while receiving the node signal;
when the relay sends a useful signal, the relay works in a half-duplex mode, meanwhile, the node sends an interference signal, and the full-duplex mode and the half-duplex mode can be freely switched.
According to the embodiment of the invention, the corresponding link is selected according to the shared information, and then the corresponding base station serial number is sent;
judging whether the signal coding rate is greater than a preset rate or not according to the link selection;
if so, the relay remains silent;
if the signal-to-noise ratio is smaller than the preset value, the relay performs full-duplex and half-duplex switching according to the signal-to-noise ratio of the link.
It should be noted that, the dense base stations are closely spaced, and they may be connected together by a high-speed wired link, or connected to a common data center/control center by a high-speed link, so as to implement sharing of data between base stations and users and synchronization of signal layers, thereby implementing closer cooperation to eliminate most of interference.
According to the embodiment of the invention, an incident signal is received, and a reflected signal of the incident signal is calculated;
according to the electromagnetic property of the reflected signal, the phase and angle of the reflected signal are adjusted,
superposing radio frequency signals of the reflected signals to obtain result information;
and transmitting the result information to the rescue platform.
It should be noted that the whole network or at least one group of base stations in the network may jointly transmit or receive data of multiple ship users to simulate the transmission process of a multiple-input multiple-output channel, and multiple-input multiple-output cooperation converts a multiple-base-station network into a multiple-user channel, so as to improve the reception performance of edge users and improve the throughput of the system.
N data streams are transmitted by using space division multiplexing, node signals are divided into a plurality of resource blocks by transmitting beam forming, different subcarriers are combined by a carrier aggregation method, the signal bandwidth on each subcarrier is reduced, the channel response is flat and quick, and the signal quality deterioration caused by radio frequency is reduced.
The nodes can be base stations or antennas, and in an area with dense layout of multiple base stations, the cooperative links can realize data synchronization, so that multiple base stations cooperate, signal interference can be reduced through distributed beam forming, pure signals can be obtained, and the transmission rate of a communication system is optimized.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above-described device embodiments are merely illustrative, for example, the division of a unit is only one logical function division, and there may be other division ways in actual implementation, such as: multiple units or components may be combined, or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the coupling, direct coupling or communication connection between the components shown or discussed may be through some interfaces, and the indirect coupling or communication connection between the devices or units may be electrical, mechanical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units; can be located in one place or distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, all the functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately regarded as one unit, or two or more units may be integrated into one unit; the integrated unit can be realized in a form of hardware, or in a form of hardware plus a software functional unit.
Those of ordinary skill in the art will understand that: all or part of the steps for realizing the method embodiments can be completed by hardware related to program instructions, the program can be stored in a computer readable storage medium, and the program executes the steps comprising the method embodiments when executed; and the aforementioned storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and various media capable of storing program codes.
Alternatively, the integrated unit of the present invention may be stored in a computer-readable storage medium if it is implemented in the form of a software functional module and sold or used as a separate product. Based on such understanding, the technical solutions of the embodiments of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a storage medium and includes several instructions to enable a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the methods of the embodiments of the present invention. And the aforementioned storage medium includes: a removable storage device, a ROM, a RAM, a magnetic or optical disk, or various other media capable of storing program code.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily think of the changes or substitutions within the technical scope of the present invention, and shall cover the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A fishery vessel rescue communication method, comprising:
establishing multi-node communication, and realizing gain of communication information by sharing respective information to obtain cooperative communication information;
the cooperative communication information forms transmission data through channel coding,
the multiple nodes are connected to the rescue platform through effective links;
the salvation platform generates salvation information by analyzing the historical operation information of the target ship,
the rescue information is subjected to synchronous data exchange through a relay protocol;
the method for carrying out synchronous data exchange on the rescue information through the relay protocol specifically comprises the following steps:
receiving the node signal, decoding the signal-encoded transmission data,
carrying out beam forming on the signal wave after decoding to obtain a pure signal;
coupling the pure signals through a high-speed cooperative link to exchange data;
further comprising: n nodes send N data streams, and the data streams are precoded to form space division multiplexing;
transmitting N data streams by using space division multiplexing, and obtaining node signals by transmitting beam forming;
dividing a node signal into a plurality of resource blocks, wherein each resource block comprises an orthogonal subcarrier signal and a subcarrier interval;
combining different sub-carriers by a carrier aggregation method;
the pre-coding is split into digital domain pre-coding and analog domain pre-coding, wherein the digital domain pre-coding is directly realized by programming under baseband frequency; the analog domain precoding is realized under the radio frequency through a phase-shifting network circuit; signals in the phase-shifting network circuit are subjected to frequency mixing operation after phase shifting is completed at the radio frequency front end;
the relay protocol comprises a full-duplex mode and a half-duplex mode, when the node sends a useful signal, the relay works in the full-duplex mode, and the relay sends an interference signal while receiving the node signal;
when the relay sends a useful signal, the relay works in a half-duplex mode, meanwhile, the node sends an interference signal, and the full-duplex mode and the half-duplex mode can be freely switched;
selecting a corresponding link according to the shared information, and then sending a corresponding base station serial number;
judging whether the signal coding rate is greater than a preset rate or not according to the link selection;
if yes, the relay keeps silent;
if the signal-to-noise ratio is smaller than the preset value, the relay performs full-duplex and half-duplex switching according to the signal-to-noise ratio of the link.
2. The fishery vessel rescue communication method of claim 1, wherein:
receiving an incident signal, and calculating a reflected signal of the incident signal;
adjusting the phase and angle of the reflected signal according to the electromagnetic characteristics of the reflected signal,
superposing radio frequency signals of the reflected signals to obtain result information;
and transmitting the result information to the rescue platform.
3. A fishery vessel rescue communication system, the system comprising: the fishery ship rescue communication method comprises a memory and a processor, wherein the memory comprises fishery ship rescue communication method programs, and the fishery ship rescue communication method programs realize the following steps when executed by the processor:
establishing multi-node communication, and realizing the gain of communication information by sharing respective information to obtain cooperative communication information;
the cooperative communication information forms transmission data through channel coding,
the multiple nodes are connected to the rescue platform through effective links;
the salvation platform generates salvation information by analyzing the historical operation information of the target ship,
the rescue information is subjected to synchronous data exchange through a relay protocol;
the method for carrying out synchronous data exchange on the rescue information through the relay protocol specifically comprises the following steps:
receiving the node signal, decoding the signal-encoded transmission data,
carrying out beam forming on the signal wave after decoding to obtain a pure signal;
coupling the pure signals through a high-speed cooperative link to exchange data;
further comprising: n nodes send N data streams, and the data streams are precoded to form space division multiplexing;
transmitting N data streams by using space division multiplexing, and obtaining node signals by transmitting beam forming;
dividing a node signal into a plurality of resource blocks, wherein each resource block comprises an orthogonal subcarrier signal and a subcarrier interval;
combining different sub-carriers by a carrier aggregation method;
the pre-coding is divided into digital domain pre-coding and analog domain pre-coding, wherein the digital domain pre-coding is directly realized by programming under baseband frequency; the analog domain precoding is realized under the radio frequency through a phase-shifting network circuit; signals in the phase-shifting network circuit are subjected to frequency mixing operation after phase shifting is finished at the radio frequency front end;
the relay protocol comprises a full-duplex mode and a half-duplex mode, when the node sends a useful signal, the relay works in the full-duplex mode, and the relay sends an interference signal while receiving the node signal;
when the relay sends a useful signal, the relay works in a half-duplex mode, and meanwhile, the node sends an interference signal, and the full-duplex mode and the half-duplex mode can be freely switched;
selecting a corresponding link according to the shared information, and then sending a corresponding base station serial number;
judging whether the signal coding rate is greater than a preset rate or not according to the link selection;
if yes, the relay keeps silent;
if the signal-to-noise ratio is smaller than the preset value, the relay performs full-duplex and half-duplex switching according to the signal-to-noise ratio of the link.
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