CN114629574B - Wireless communication system and communication method thereof - Google Patents
Wireless communication system and communication method thereof Download PDFInfo
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- CN114629574B CN114629574B CN202210252923.0A CN202210252923A CN114629574B CN 114629574 B CN114629574 B CN 114629574B CN 202210252923 A CN202210252923 A CN 202210252923A CN 114629574 B CN114629574 B CN 114629574B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/309—Measuring or estimating channel quality parameters
- H04B17/318—Received signal strength
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/30—Monitoring; Testing of propagation channels
- H04B17/382—Monitoring; Testing of propagation channels for resource allocation, admission control or handover
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W4/42—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P] for mass transport vehicles, e.g. buses, trains or aircraft
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Abstract
The disclosure provides a wireless communication system and a communication method thereof, belonging to the technical field of communication. The wireless communication system of the present disclosure includes a first control module, a first antenna, and a second antenna. The first control module is configured to control the working state of the first antenna when the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is larger than or equal to a first preset value. The first control module is further configured to control the second antenna to switch from the non-operating state to the operating state when the reference signal received power of the electromagnetic wave of the first band received by the first antenna is greater than or equal to a second preset value and smaller than the first preset value. The first control module is further configured to control the first antenna to switch from the operating state to the non-operating state and control the operating state of the second antenna when the reference signal receiving power of the electromagnetic wave of the first band received by the first antenna is smaller than a second preset value.
Description
Technical Field
The disclosure belongs to the technical field of communication, and in particular relates to a wireless communication system and a communication method thereof.
Background
In recent 10 years, the railways in China undergo a series of technical improvements such as heavy load transportation, electrified transformation, existing line speed increasing, qinshen passenger special line construction and the like, and high-speed rails are an important development direction of the railways in China at present.
In a high-speed railway communication system, a wireless communication technology is widely applied to communication systems such as communication signals, dispatching commands, public security fire protection, mobile communication, passenger information release and the like. Meanwhile, maintaining data exchange between the high-speed rail and the communication system at all times has become a basis and a premise for ensuring efficient operation of the high-speed rail transportation system.
In a high-speed railway wireless communication system, a plurality of problems such as serious carriage penetration loss, complex signal propagation model, obvious Doppler effect, ping-pong effect caused by frequent base station switching and the like exist in providing high-quality continuous and reliable communication service.
Meanwhile, in a high-speed railway wireless communication system, wireless signal propagation is rapidly changed along with the change of the running environment of the high-speed railway in addition to the factors of frequency band, space, time and the like. Especially, the Chinese operators are wide, the topography is complex and changeable, so that the running environment of the high-speed rail in China is complex, and the method brings great challenges for providing high-quality, continuous and reliable communication service.
Disclosure of Invention
The present disclosure aims to solve at least one of the technical problems in the prior art, and provides a wireless communication system and a communication method thereof.
In a first aspect, the present disclosure provides a wireless communication system for use in a vehicle, comprising a first control module, a first antenna, and a second antenna; the first antenna is configured to receive electromagnetic waves of a first wave band; the second antenna is configured to receive electromagnetic waves of a second wave band; the first control module is configured to generate a first control signal when the received power of the reference signal of the electromagnetic wave in the first wave band received by the first antenna is greater than or equal to a first preset value, and send the first control signal to the first antenna so as to control the working state of the first antenna; the first control module is further configured to generate a second control signal when the reference signal received power of the electromagnetic wave in the first band received by the first antenna is greater than or equal to a second preset value and smaller than the first preset value, and send the second control signal to the second antenna so as to control the second antenna to switch from the non-working state to the working state; the first control module is further configured to generate a third control signal when the reference signal receiving power of the electromagnetic wave of the first band received by the first antenna is smaller than the second preset value, and send the third control signal to the first antenna and the second antenna so as to control the first antenna to switch from the working state to the non-working state and control the working state of the second antenna.
Wherein the range of the first preset value and the second preset value is 0-30db.
The system further comprises a first signal sending module; the first signal transmission module is configured to transmit electromagnetic waves of the first band to the first antenna.
Wherein the first signal transmission module comprises a satellite.
The system also comprises a second signal sending module; the second signal transmission module is configured to transmit electromagnetic waves of the second band to the second antenna.
The propagation direction of the electromagnetic wave of the second wave band sent by the second signal sending module is perpendicular to the plane where the moving direction of the vehicle is located.
Wherein the second signal transmitting module includes: the system comprises a central control sub-module, a remote access sub-module and a signal transmission sub-module; the central control sub-module is configured to generate a plurality of second communication signals according to the first communication signals transmitted by the ground base station; the remote access sub-module is configured to generate electromagnetic waves of the second wave band according to the second communication signal; the signal transmission sub-module is configured to transmit the electromagnetic wave of the second wave band to the second antenna in a plane direction perpendicular to the movement direction of the vehicle.
The signal transmission submodule at least comprises a leaky wave cable.
Wherein the wireless communication system further comprises: a first positioning module; the first positioning module is configured to generate a position signal according to the position of the vehicle; the position information includes a first position signal, a second position signal, and a third position signal; the first control module is configured to generate the first control signal when the first positioning module generates a first position signal, and send the first control signal to the first antenna so as to control the working state of the first antenna; the first control module is further configured to generate a second control signal when the first positioning module generates the second position signal, and send the second control signal to the second antenna to control the second antenna to switch from the non-working state to the working state; the first control module is further configured to generate the third control signal and send the third control signal to the first antenna when the first positioning module generates the third position signal, so as to control the first antenna to switch from the working state to the non-working state.
Wherein the frequency of the electromagnetic wave of the first wave band comprises a signal of a ka frequency band or a ku frequency band.
The frequency of the electromagnetic wave of the second wave band comprises a GSM-R signal, an LTE-R signal and a G-R signal.
Wherein the vehicle comprises a high-speed rail.
In a second aspect, the present disclosure also provides a communication method of a wireless communication system, which is applicable to the above wireless communication system, including: when the first control module judges that the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is larger than or equal to a first preset value, a first control signal is generated; the first antenna responds to the first control signal and is switched to a working state; when the first control module judges that the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is larger than or equal to a second preset value and smaller than the first preset value, a second control signal is generated; the second antenna responds to the second control signal and is switched from a non-working state to the working state; when the first control module judges that the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is smaller than the second preset value, a third control signal is generated; the first antenna is responsive to the third control signal to transition from the operational state to the non-operational state.
Drawings
FIG. 1 is a schematic diagram of an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a wireless communication system of an embodiment of the present disclosure;
fig. 3 is another schematic diagram of a wireless communication system of an embodiment of the present disclosure;
fig. 4 is a schematic diagram of a positional relationship between a high-speed rail and a first antenna and a second antenna of an embodiment of the present disclosure;
fig. 5 is a schematic diagram of another positional relationship between a high-speed rail and a first antenna and a second antenna of an embodiment of the present disclosure;
fig. 6 is a schematic diagram of another positional relationship between a high-speed rail and a first antenna and a second antenna of an embodiment of the present disclosure;
fig. 7 is a schematic diagram of a positional relationship between a tunnel and a second signaling module according to an embodiment of the present disclosure.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present disclosure, the present disclosure will be described in further detail with reference to the accompanying drawings and detailed description.
Unless defined otherwise, technical or scientific terms used in this disclosure should be given the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The terms "first," "second," and the like, as used in this disclosure, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a," "an," or "the" and similar terms do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In a first aspect, the present disclosure provides a wireless communication system that is applicable in vehicles, and in particular, on high-speed rail 6. In the following examples, the vehicle is exemplified as the high-speed rail 6. The wireless communication system comprises a first control module 1, a first antenna 2 and a second antenna 3. The first antenna 2 is configured to receive electromagnetic waves of a first wavelength band and the second antenna 3 is configured to receive electromagnetic waves of a second wavelength band. In some embodiments, the electromagnetic wave of the first band includes a ka-band or ku-band signal, and the first antenna 2 may be a satellite antenna since the ka-band or ku-band signal is often used in satellite communications. In some embodiments, the electromagnetic wave of the second band includes at least one of a GSM-R (Global System for Mobile Communications-ranging) signal, an LTE-R (Long Term Evolution-ranging) signal, or a 5G-R (5 th Generation Mobile Communication Technology-ranging) signal, and the second antenna 3 may be a relay antenna for communicating with a ground base station since the GSM-R signal, the LTE-R signal, or the 5G-R signal is commonly used in a Railway wireless communication system.
In the embodiment of the present disclosure, the first control module 1 is configured to generate a first control signal when a reference signal received power RSRP (Reference Signal Receiving Power, reference signal received power) of the electromagnetic wave of the first band received by the first antenna 2 is greater than or equal to a first preset value, and send the first control signal to the first antenna 2 to control the working state of the first antenna 2. The first control module 1 is further configured to generate a second control signal when the RSRP of the electromagnetic wave of the first band received by the first antenna 2 is greater than or equal to a second preset value and smaller than the first preset value, and send the second control signal to the second antenna 3 to control the second antenna 3 to switch from the non-working state to the working state. The first control module 1 is further configured to generate a third control signal when the RSRP of the electromagnetic wave of the first band received by the first antenna 2 is smaller than a second preset value, and send the third control signal to the first antenna 2 and the second antenna 3, so as to control the first antenna 2 to switch from the working state to the non-working state, and control the working state of the second antenna 3.
Specifically, since the wireless communication system of the embodiment of the present disclosure is applied to the high-speed rail 6, and wireless signal transmission on the high-speed rail 6 is rapidly changed as the running environment of the high-speed rail 6 is changed. For example: when the high-speed rail 6 runs in a mountain area or the high-speed rail 6 passes through the tunnel 7, the RSRP of the electromagnetic waves of the first frequency band received by the first antenna 2 on the high-speed rail 6 is lower or directly drops to zero; when the high-speed rail 6 runs in a relatively open area, the RSRP of the electromagnetic waves of the first frequency band received by the first antenna 2 on the high-speed rail 6 is higher; when the high-speed rail 6 runs at the junction of the relatively open area and the tunnel 7, the RSRP of the electromagnetic wave of the first frequency band received by the first antenna 2 on the high-speed rail 6 is in a certain range.
In the embodiment of the present disclosure, as shown in fig. 1, since the first antenna 2 may be a satellite antenna, the received electromagnetic wave of the first frequency band may be a satellite signal. Therefore, the traveling area of the high-speed rail 6 can be divided into a satellite communication area, a transition area and a satellite communication blind area according to the size of RSRP of the electromagnetic wave of the first frequency band received by the first antenna 2 on the high-speed rail 6, for example: when RSRP is larger than or equal to a first preset value, the high-speed rail 6 is positioned in a satellite communication area; when the RSRP is smaller than the first preset value and larger than or equal to the second preset value, the high-speed rail 6 is positioned in the transition zone; when the RSRP is smaller than the second preset value, the high-speed rail 6 is in a satellite communication blind area.
In the embodiment of the present disclosure, as shown in fig. 2, since the wireless communication system includes the first control module 1, the first control module 1 may include a calculation submodule 101 for calculating the size of RSRP of the electromagnetic wave of the first frequency band received by the first antenna 2 and a logic determination submodule 102 for making logic determination. When the high-speed rail 6 is in the traveling state, the calculating submodule 101 calculates the RSRP of the electromagnetic wave of the first frequency band received by the first antenna 2, and sends the RSRP to the logic judging submodule 102. The judging submodule judges that when the RSRP of the electromagnetic waves of the first frequency band received by the first antenna 2 is larger than or equal to a first preset value, a first control signal is generated and sent to the first antenna 2, so that the first antenna 2 is kept in a working state when the high-speed rail 6 is in a satellite communication area. In this way, satellite communication is mainly performed through the first antenna 2 in the satellite communication area, so that the ping-pong effect caused by using a large amount of ground base station communication is avoided, and the communication quality is prevented from being influenced. When the logic judgment sub-module 102 judges that the RSRP of the electromagnetic wave of the first wave band received by the first antenna 2 is greater than or equal to the second preset value and smaller than the first preset value, a second control signal is generated and sent to the second antenna 3 to control the second antenna 3 to switch from the non-working state to the working state in the transition area. In this way, the first antenna 2 and the second antenna 3 are simultaneously in an operating state in the transition region, that is, satellite communication and ground base station communication are simultaneously performed in the transition region, so that the influence of the decrease of the RSRP of the electromagnetic wave received by the first antenna 2 in the transition region on the communication effect is avoided. The logic determination sub-module 102 determines that when the RSRP of the electromagnetic wave of the first band received by the first antenna 2 is smaller than the second preset value, a third control signal is generated and sent to the first antenna 2, so as to control the first antenna 2 to switch from the working state to the non-working state in the satellite communication blind area. In this way, the first antenna 2 is switched from the working state to the non-working state in the satellite communication blind area, so that the second antenna 3 is used as a main communication antenna in the satellite communication blind area, i.e. the communication is performed mainly in the ground base station communication mode in the satellite communication blind area, and in this way, the communication quality is ensured. Meanwhile, in the embodiment of the disclosure, the quality and the continuity of signal transmission of the high-speed rail 6 in the running process are ensured by switching different antennas and working states of the different antennas.
In some embodiments, as shown in fig. 3, the wireless communication system may further comprise a first positioning module 5. The first positioning module 5 is configured to generate a position signal according to the position of the vehicle; the position information includes a first position signal, a second position signal, and a third position signal. The first control module 1 is configured to generate a first control signal when the first positioning module 5 generates the first position signal, and send the first control signal to the first antenna 2 to control the working state of the first antenna 2. The first control module 1 is further configured to generate a second control signal when the first positioning module 5 generates the second position signal, and send the second control signal to the second antenna 3 to control the second antenna 3 to switch from the non-operating state to the operating state. The first control module 1 is further configured to generate a third control signal and send the third control signal to the first antenna 2 to control the first antenna 2 to switch from the operating state to the non-operating state when the first positioning module 5 generates the third position signal.
In the embodiment of the present disclosure, since the travel track of the high-speed rail 6 is predictable, the positions of the satellite communication zone, the transition zone, and the satellite communication blind zone can also be predictable. Meanwhile, the first positioning module 5 can generate a position signal according to the position of the high-speed rail 6, so that the first control module 1 can switch the working states of different antennas and different antennas according to the position signal generated by the first positioning module 5 and the predicted positions of the satellite communication area, the transition area and the satellite communication blind area.
Specifically, when the first positioning module 5 generates the first position signal, the first control module 1 determines that the high-speed rail 6 is in the satellite communication area, generates the first control signal, and sends the first control signal to the first antenna 2, so that the first antenna 2 maintains the working state when the high-speed rail 6 is in the satellite communication area. In this way, satellite communication is mainly performed through the first antenna 2 in the satellite communication area, so that the ping-pong effect caused by using a large amount of ground base station communication is avoided, and the communication quality is prevented from being influenced. When the first positioning module 5 generates the second position information, the first control module 1 determines that the high-speed rail 6 is in the transition region, generates a second control signal and sends the second control signal to the second antenna 3 to control the second antenna 3 to switch from the non-working state to the working state in the transition region. In this way, the first antenna 2 and the second antenna 3 are simultaneously in an operating state in the transition region, that is, satellite communication and ground base station communication are simultaneously performed in the transition region, so that the influence of the decrease of the RSRP of the electromagnetic wave received by the first antenna 2 in the transition region on the communication effect is avoided. When the first positioning module 5 generates the third position information, the first control module 1 determines that the high-speed rail 6 is in a satellite signal blind area, generates a third control signal and sends the third control signal to the first antenna 2 so as to control the first antenna 2 to switch from the working state to the non-working state in the satellite communication blind area. In this way, the first antenna 2 is switched from the working state to the non-working state in the satellite communication blind area, so that the second antenna 3 is used as a main communication antenna in the satellite communication blind area, i.e. the communication is performed mainly in the ground base station communication mode in the satellite communication blind area, and in this way, the communication quality is ensured. It should be noted that, in some embodiments, the first positioning module 5 and the calculating submodule 101 and the logic judging submodule 102 work simultaneously, so that the continuity of the signal is better.
In some embodiments, the time point when the first positioning module 5 generates the second location information may be before the logic determination sub-module 102 determines that the RSRP of the electromagnetic wave of the first band received by the first antenna 2 is greater than or equal to the second preset value and less than the first preset value. In this way, the first antenna 2 and the second antenna 3 can be simultaneously switched to the operation state before the high-speed rail 6 enters the transition zone, that is, satellite communication and ground base station communication are simultaneously performed before the transition zone. In this way, the high-speed rail 6 is made more excellent in signal continuity when entering the transition zone.
In some embodiments, the magnitudes of the first preset value and the second preset value may be calculated according to environmental information of the high-speed rail 6 during traveling. The first preset value and the second preset value may be between 0-30db in size, and may be changed for different environmental information for the high-speed rail 6 traveling in different environments. For example: when the high-speed rail 6 is driven into the tunnel 7 from plain, the first preset value may be 20db and the second preset value may be 10db.
In some embodiments, as shown in fig. 4, the first antenna 2 and the second antenna 3 may be provided on the high-speed rail 6, respectively. In some embodiments, as shown in fig. 5 and 6, the high-speed rail 6 may be provided with a plurality of first antennas 2 and a plurality of second antennas 3, with a certain distance between the first antennas 2 and the second antennas 3. That is, the embodiment of the present disclosure does not set any limitation on the arrangement of the first antenna 2 and the second antenna 3 on the high-speed rail 6, and it is within the scope of the embodiment of the present disclosure as long as the antenna arrangement is provided with a certain distance between the first antenna 2 and the second antenna 3.
In some embodiments, the wireless communication system may further comprise a first signal transmission module and a second signal transmission module 4. Wherein a first signal transmission module is configured to transmit electromagnetic waves of the first wavelength band to the first antenna 2; the second signal transmission module 4 is configured to transmit electromagnetic waves of the second wavelength band to the second antenna 3 module. In some embodiments, the first signal transmitting module includes one or more communication satellites, so that the high-speed rail 6 can receive satellite signals through the first antenna 2 to complete communication during traveling. By the mode, the ping-pong effect caused by using a large amount of ground base station communication is avoided, and the communication quality is influenced. In the embodiment of the present disclosure, the propagation direction of the electromagnetic wave in the second band transmitted by the second signal transmitting module 4 is perpendicular to the plane in which the moving direction of the high-speed rail 6 is located. In this way, the doppler effect of the electromagnetic wave of the second band due to the rapid movement of the high-speed rail 6 is avoided, affecting the communication quality between the second signal transmission module 4 and the second antenna 3.
In some embodiments, referring to fig. 7, the second signal transmission module 4 includes: a central control sub-module 401, a remote access sub-module 402 and a signal transmission sub-module 403. The central control sub-module 401 is configured to generate a plurality of second communication signals from the first communication signals transmitted by the terrestrial base station. The remote access sub-module 402 is configured to generate electromagnetic waves of a second band from the second communication signal; the signal transmission sub-module 403 is configured to transmit electromagnetic waves of the second band to the second antenna 3 in a direction perpendicular to a plane in which the direction of movement of the vehicle is located. In this way, a distributed network architecture is achieved.
Specifically, in the disclosed embodiment, one central control sub-module 401 is communicatively connected to a plurality of remote access sub-modules 402. The central control sub-module 401 converts the first communication signal transmitted by the ground base station into a second communication signal, and transmits the second communication signal to the remote access sub-module 402 communicatively connected to the central control sub-module 401 in a manner of optical or wireless link control. Wherein the first communication signal may be a radio frequency signal and the second communication signal may be an optical signal. The remote access sub-module 402 converts and amplifies the second communication signal, generates electromagnetic waves of the second band, and transmits the electromagnetic waves to the second antenna 3 through the signal transmission sub-module 403. In some embodiments, as shown in fig. 7, the second signal sending module 4 may be disposed in the tunnel 7, so as to send electromagnetic waves of the second band to the high-speed rail 6 in the communication signal blind area, so as to complete the communication of the high-speed rail 6 in the satellite communication blind area. It should be noted that, in the embodiment of the present disclosure, one or more second signal sending modules 4 may be arranged according to the length of the tunnel 7, which is within the protection scope of the embodiment of the present disclosure.
In some embodiments, with continued reference to fig. 7, the signal transmission sub-module 403 includes at least a leaky wave cable. Specifically, a leaky wave cable is laid on the top of the tunnel 7. Through setting up the mouth of examining on the leaky wave cable for the transmission direction of the electromagnetic wave of the second wave band that leaky wave cable revealed and the plane that high-speed railway 6 running direction was located are mutually perpendicular, with the adverse effect that eliminates the Doppler effect and bring. Meanwhile, the leaky wave cable can well solve the serious fading problem existing in the traditional antenna system, so that signals in the tunnel 7 have good flatness, and the reliability and safety of communication are guaranteed.
In a second aspect, embodiments of the present disclosure also provide a communication method of a wireless communication system, which is applicable to the wireless communication systems shown in fig. 1 to 7.
The communication method of the embodiment of the disclosure comprises the following steps: when the first control module 1 determines that the reference signal receiving power of the electromagnetic wave of the first band received by the first antenna 2 is greater than or equal to a first preset value, a first control signal is generated. The first antenna 2 is switched to an operating state in response to a first control signal. When the first control module 1 determines that the reference signal receiving power of the electromagnetic wave of the first band received by the first antenna 2 is greater than or equal to the second preset value and less than the first preset value, a second control signal is generated. The second antenna 3 is switched from the non-operating state to the operating state in response to the second control signal. When the first control module 1 determines that the reference signal receiving power of the electromagnetic wave of the first band received by the first antenna 2 is smaller than the second preset value, a third control signal is generated. The first antenna 2 is switched from the active state to the inactive state in response to the third control signal.
In this way, in the embodiment of the present disclosure, the first control module 1 controls the first antenna 2 to operate when the RSRP of the electromagnetic wave in the first band is strong (i.e., the RSRP is greater than or equal to the first preset value), so that the high-speed rail 6 performs signal transmission by means of satellite communication. When the RSRP of the electromagnetic wave in the first band is not strong enough (i.e., the RSRP is greater than the second preset value and smaller than the first preset value), the first control module 1 controls the second antenna 3 to switch from the non-working state to the working state, and at this time, the first antenna 2 and the second antenna 3 work simultaneously, so as to ensure the signal transmission quality of the wireless communication system. When the RSPR of the electromagnetic wave of the first band is weak (i.e., RSRP is smaller than the second preset value), it may be considered that the communication of the high-speed rail 6 is interfered by the external environment or the first antenna 2 has a communication failure, and the first control module 1 controls the first antenna 2 to switch from the operating state to the non-operating state, so that the second antenna 3 operates as a main operating antenna. In this way, when the signal received by the first antenna 2 is weak or cannot work, the working state of the wireless communication system is ensured.
It is to be understood that the above embodiments are merely exemplary embodiments employed to illustrate the principles of the present disclosure, however, the present disclosure is not limited thereto. Various modifications and improvements may be made by those skilled in the art without departing from the spirit and substance of the disclosure, and are also considered to be within the scope of the disclosure.
Claims (10)
1. A wireless communication system, wherein the wireless communication system is applied to a high-speed rail, and the wireless communication system comprises a first control module, a first antenna and a second antenna;
the first antenna is configured to receive electromagnetic waves of a first wave band; the second antenna is configured to receive electromagnetic waves of a second wave band; the traveling area of the high-speed rail is divided into a satellite communication area, a transition area and a satellite communication blind area according to the received power of the reference signal of the electromagnetic wave of the first frequency band received by the first antenna on the high-speed rail;
when the reference signal receiving power is larger than or equal to a first preset value, the high-speed rail is positioned in a satellite communication area; when the reference signal receiving power is smaller than the first preset value and larger than or equal to the second preset value, the high-speed rail is positioned in the transition zone; when the reference signal receiving power is smaller than a second preset value, the high-speed rail is positioned in a satellite communication blind area;
the first control module is configured to generate a first control signal when the received power of the reference signal of the electromagnetic wave in the first wave band received by the first antenna is greater than or equal to a first preset value, and send the first control signal to the first antenna so as to control the first antenna to keep a working state when the high-speed rail is in a satellite communication area;
the first control module is further configured to generate a second control signal when the reference signal received power of the electromagnetic wave in the first wave band received by the first antenna is greater than or equal to a second preset value and smaller than the first preset value, and send the second control signal to the second antenna so as to control the second antenna to be switched from a non-working state to a working state when the high-speed rail is in a transition region;
the first control module is further configured to generate a third control signal when the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is smaller than the second preset value, and send the third control signal to the first antenna and the second antenna so as to control the first antenna to be switched from the working state to the non-working state when the high-speed rail is in a satellite communication blind area and control the second antenna to keep the working state; wherein,
the frequency of the electromagnetic wave of the first wave band comprises a signal of a ka frequency band or a ku frequency band;
the frequency of the electromagnetic wave of the second wave band comprises a GSM-R signal, an LTE-R signal and a 5G-R signal.
2. The wireless communication system of claim 1, wherein the first preset value and the second preset value range from 0db to 30db.
3. The wireless communication system of claim 1, further comprising a first signaling module; the first signal transmission module is configured to transmit electromagnetic waves of the first band to the first antenna.
4. A wireless communication system according to claim 3, wherein the first signal transmission module comprises a satellite.
5. The wireless communication system of claim 1, further comprising a second signaling module;
the second signal transmission module is configured to transmit electromagnetic waves of the second band to the second antenna.
6. The wireless communication system of claim 5, wherein,
and the propagation direction of the electromagnetic wave in the second wave band sent by the second signal sending module is perpendicular to the plane in which the moving direction of the high-speed rail is located.
7. The wireless communication system of claim 5, wherein the second signaling module comprises: the system comprises a central control sub-module, a remote access sub-module and a signal transmission sub-module;
the central control sub-module is configured to generate a plurality of second communication signals according to the first communication signals transmitted by the ground base station;
the remote access sub-module is configured to generate electromagnetic waves of the second wave band according to the second communication signal;
the signal transmission sub-module is configured to transmit electromagnetic waves of the second wave band to the second antenna.
8. The wireless communication system of claim 7, wherein the signal transmission submodule includes at least a leaky wave cable.
9. The wireless communication system of claim 1, further comprising: a first positioning module;
the first positioning module is configured to generate a position signal according to the position of the high-speed rail; the position information includes a first position signal, a second position signal, and a third position signal;
the first control module is configured to generate the first control signal when the first positioning module generates a first position signal, and send the first control signal to the first antenna so as to control the working state of the first antenna;
the first control module is further configured to generate a second control signal when the first positioning module generates the second position signal, and send the second control signal to the second antenna to control the second antenna to switch from the non-working state to the working state;
the first control module is further configured to generate the third control signal and send the third control signal to the first antenna when the first positioning module generates the third position signal, so as to control the first antenna to switch from the working state to the non-working state.
10. A communication method of a wireless communication system, the wireless communication system being applied to a high-speed rail, the method comprising:
the first antenna receives electromagnetic waves of a first wave band; the second antenna receives electromagnetic waves of a second wave band; wherein,
according to the magnitude of the reference signal receiving power of the electromagnetic wave of the first frequency band received by the first antenna on the high-speed rail, the advancing area of the high-speed rail is divided into a satellite communication area, a transition area and a satellite communication blind area, and when the reference signal receiving power is larger than or equal to a first preset value, the high-speed rail is positioned in the satellite communication area; when the reference signal receiving power is smaller than the first preset value and larger than or equal to the second preset value, the high-speed rail is positioned in the transition zone; when the reference signal receiving power is smaller than a second preset value, the high-speed rail is positioned in a satellite communication blind area;
when the first control module judges that the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is larger than or equal to a first preset value, a first control signal is generated and sent to the first antenna; the first antenna responds to the first control signal, and keeps a working state when the high-speed rail is in a satellite communication area;
when the first control module judges that the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is larger than or equal to a second preset value and smaller than the first preset value, a second control signal is generated and sent to the second antenna; the second antenna responds to the second control signal and is switched from a non-working state to the working state when the high-speed rail is in a transition zone;
when the first control module judges that the reference signal receiving power of the electromagnetic wave of the first wave band received by the first antenna is smaller than the second preset value, a third control signal is generated and sent to the first antenna and the second antenna; the first antenna responds to the third control signal, and when the high-speed rail is in a satellite communication blind zone, the working state is switched to the non-working state, and the second antenna is controlled to keep the working state;
the frequency of the electromagnetic wave of the first wave band comprises a signal of a ka frequency band or a ku frequency band;
the frequency of the electromagnetic wave of the second wave band comprises a GSM-R signal, an LTE-R signal and a 5G-R signal.
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