CN117915414A - Communication method and system for train running on fully closed line - Google Patents
Communication method and system for train running on fully closed line Download PDFInfo
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Abstract
The invention belongs to the technical field of communication, and particularly relates to a communication method and a communication system for running a train on a totally-enclosed circuit. The method comprises the following steps: s1, under the condition that a train shielding door leaves from a first station to a second station in a closed state, a first base station acquires a communication connection signal transmitted by a user terminal in a carriage of a train; s2, the first base station judges the communication type according to the communication connection signal, and judges whether geological shielding of the communication connection signal exists in the tunnel line according to the communication type; if so, the first base station forwards the communication connection signal with the geological shielding service type and/or shielding type to the second base station; if not, the first base station does not send the service type to the second base station; and S3, after receiving the communication connection signal forwarded by the first base station, the second base station enables the train to be in communication connection with the user terminal when running to the geological shielding section in the tunnel line. The problem of network disconnection or signal interruption of a tunnel line is solved.
Description
Technical Field
The invention belongs to the technical field of communication, and particularly relates to a communication method and a communication system for running a train on a totally-enclosed circuit.
Background
In the practice of running a train, when the train runs to a certain place in the middle of a tunnel line, sharp sound appears, and at the moment, the communication signal of a user terminal is poor, even network disconnection or signal interruption occurs.
Disclosure of Invention
The invention aims to provide a communication method and a communication system for running a train on a totally enclosed line, so as to solve the problem that a user terminal is disconnected from the network or a signal is interrupted at a non-midpoint of a tunnel line.
A first aspect of the present invention provides a communication method for a train running on a totally enclosed line, the totally enclosed line comprising at least a first station, a second station and a tunnel line between the first station and the second station; the first station is provided with a first base station, and the second station is provided with a second base station; the method comprises the following steps:
S1, under the condition that a train shielding door leaves from the first station to drive to the second station in a closed state, a communication connection signal transmitted by a user terminal in a carriage of the train is acquired by the first base station;
S2, the first base station judges the communication type according to the communication connection signal, and judges whether geological shielding of the communication connection signal exists in the tunnel line according to the communication type;
If so, the first base station forwards the communication connection signals with the geological shielding service type and/or shielding type to the second base station;
if not, the first base station does not send the service type to the second base station;
And S3, after the second base station receives the communication connection signal forwarded by the first base station, the train is in communication connection with the user terminal when running to the geological shielding section in the tunnel line.
In some manners that may be implemented, in step S2, if the geological shield exists, the service type is a telephone service, a data traffic service or other services; the shielding type is a point or an interval;
In step S3, the second base station configures a dedicated random access preamble for the user terminal whose service type is the telephone service and the data traffic service; and the service type is that the user terminal of the telephone service and the data flow service adopts a non-competition mode random access process to access the second base station.
In some embodiments, the tunnel line has a length ofIn step S3, if the service type of the geological shield is the telephone service, the distance between the geological shield point a in the tunnel line and the first station is taken as，/>，/>Taking 0.25-0.4, radiating a first signal adjustment power to a geological shielding point A by the first base station, radiating a second signal adjustment power to the geological shielding point A by the second base station, and intersecting the first signal adjustment power and the second signal adjustment power at the point A.
In some implementations, the first signal adjusts a power function of the powerThe method comprises the following steps:
；
power function of second signal regulated power The method comprises the following steps:
；
wherein, For transmitting power amplitude,/>Is angular frequency,/>For time, α is wavelength,/>To adjust the coefficient,/>The value is 0.7-0.9,/>In imaginary units.
In some embodiments, in step S3, if the type of the geological shield is a section, the length of the geological shield section CD is taken to be，/>Taking the interval coefficient as 1/1000 to 1/500, the distance between the geological shielding interval CD and the first station is L3, and the distance between the geological shielding interval CD and the second station is/>，; When the speed of the train is in the range of 80-120 km/h/>Taking 1-1.1, and when the speed of the train is less than 80 km/h/>Taking 0.9-1;
taking a point E between the outside of the geological shielding region CD and the first station, wherein the distance from the point E to the first station 1 is as follows ，/>，/>The length of the train; /(I)Taking 0.9-1.1 for the train speed impact coefficient;
the first base station radiates a first signal extension power to point E and the second base station radiates the second signal extension power to point E, the first signal extension power and the second signal extension power intersecting at point E.
In some implementations, the first signal extends a power function of powerThe method comprises the following steps:
；
power function of the second signal extension power The method comprises the following steps:
；
wherein, And/>The first base station switching compensation coefficient and the second base station switching compensation coefficient are respectively, and/>，/>，/>The amplitude compensation coefficient is taken to be 0.1-0.2.
In some implementations, in step S3, the second base station configures a dedicated random access preamble for the ue with the service type of the telephone service, and the second base station accesses the second base station by adopting a non-contention mode random access procedure for the ue with the service type of the data traffic service; the second base station divides the user terminals with the service type of the data flow service into different subgroups, the number of the user terminals in each subgroup is not more than 4, each subgroup is allocated with the same ZC sequence, and the subgroup is taken as a unit to carry out synchronous channel with the second base station.
A second aspect of the present invention provides a communication system for a rail transit system having a totally enclosed line, the rail transit system comprising at least a first station, a second station, and a tunnel line between the first station and the second station; the communication system comprises a first base station arranged at the first station, a second base station arranged at the second station, and the communication method adopted between the first base station and the second base station.
The third aspect of the present invention provides a rail transit system, comprising a first station, a second station and a totally enclosed line between the first station and the second station, wherein the totally enclosed line is provided with the communication system or adopts the communication method to carry out communication.
The beneficial technical effects are as follows:
Acquiring, by the first base station, a communication connection signal transmitted by an in-car user terminal of the train with a train screen door moving away from the first station toward the second station in a closed state; the first base station judges the communication type according to the communication connection signal and judges whether geological shielding of the communication connection signal exists in the tunnel line according to the communication type; if so, the first base station forwards the communication connection signals with the geological shielding service type and/or shielding type to the second base station; if not, the first base station does not send the service type to the second base station; and after receiving the communication connection signal forwarded by the first base station, the second base station enables the train to be in communication connection with the user terminal when running to the geological shielding section in the tunnel line. By the method, the network disconnection or signal connection of the user terminal at the non-midpoint of the tunnel line is realized.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
Fig. 1 is a schematic diagram of a station and tunnel line according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of a tunnel line geological shielding point according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of a tunnel line geological shielding interval according to an embodiment of the present invention.
Fig. 4 is a flow chart of a communication method when the train is running in the embodiment of the invention.
Fig. 5 is a schematic diagram of a communication system according to an embodiment of the present invention.
Reference numerals:
1. A first station; 2. a second station; 3. a tunnel line; 4. a first signal power; 5. a second signal power; 6. the first signal adjusts power; 7. the second signal adjusts power; 8. a first signal extension power; 9. the second signal extends the power.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The following explains some nouns related to the present application to understand the present technical solution:
The signal power refers to a method adopted when the signal adjusts the power, namely, the signal quality condition under different powers is displayed through a graph, so that a user can select proper power to send the signal according to the requirement.
A cell refers to a basic constituent element in a mobile communication network.
The extended power refers to that the power of the transmitting end needs to be adjusted to adapt to new requirements and environments under the condition of coverage expansion or signal strength enhancement. The extended power may be a strategy or algorithm for effectively adjusting the power to meet different communication requirements while guaranteeing the communication quality.
Example 1
As shown in fig. 1-2, the communication method for train running on fully enclosed line of the present application comprises a first station 1, a second station 2, a tunnel line 3 between the first station 1 and the second station 2, the tunnel line 3 having a length ofA first signal power 4 radiated by the first station 1 to the tunnel line 3, a second signal power 5 radiated by the second station 2 to the tunnel line 3, the first signal power 4 and the second signal power 5 being at/>Crossing the two points so that the train moving at high speed is at the midpoint of the tunnel line 3) Switching from a first base station accessing a first station 1 to a second base station accessing a second station 2 or switching from the second base station accessing the second station 2 to the first base station accessing the first station 1, realizing the midpoint (/ >) of the user terminal in the tunnel line 3) And the switching of different base stations is realized, and the continuity, stability and reliability of the communication of the user terminal are ensured.
In a certain train running practice, when the train runs to a certain place in the middle of the tunnel line 3, sharp sound sounds appear, and at the moment, communication signals of the user terminal are poor, even network disconnection or signal interruption occurs, so that the problem that the user terminal is disconnected from the network or the signal is interrupted at a non-middle point of the tunnel line 3 needs to be solved.
The applicant has found that the above phenomenon is due to the occurrence of geological shielding in the part of the tunnel line 3, which affects the signal synchronization of the user terminal with the connected base station, and thus the phenomenon of network disconnection or signal interruption occurs.
Taking the distance from the geological shielding point A in the tunnel line 3 to the first station 1 as followsPreferably/>，Taking 0.25-0.4, the first base station of the first station 1 radiates a first signal adjusting power 6 to the geological shielding point A, the second base station of the second station 2 radiates a second signal adjusting power 7 to the geological shielding point A, and the first signal adjusting power 6 and the second signal adjusting power 7 intersect at the position A, so that a train moving at high speed is switched from the first base station accessed to the first station 1 to the second base station accessed to the second station 2 or from the second base station accessed to the second station 2 to the first base station accessed to the first station 1 at the geological shielding point A of the tunnel line 3, the user terminal is switched from different base stations at the non-midpoint of the tunnel line 3, and the duration, stability and reliability of the communication of the user terminal are improved.
Preferably, the first signal adjusts the power function of the power 6The method comprises the following steps:
；
In the middle of For transmitting power amplitude,/>Is angular frequency,/>For time, α is wavelength,/>To adjust the coefficient,/>The value is 0.7-0.9,/>Is imaginary unit, satisfies/>-1 To identify the imaginary part in the complex number.
The second signal adjusts the power function of the power 7The method comprises the following steps:
。
The power amplitude values of the first signal adjustment power 6 and the second signal adjustment power 7 are set to be asymmetric, so that the cell search time length during base station switching at the geological shielding point A is reduced, and the duration, stability and reliability of the access of the user terminal to the base station communication are improved.
Example 2
This example is a modification of example 1.
Referring to fig. 3, in example 1, the geological shielding point a is considered, and in this example, the geological shielding section CD is considered, that is, the geological shielding section CD where the tunnel line 3 appears locally, and the length of the geological shielding section CD is，/>Taking the interval coefficient as 1/1000 to 1/500, the distance between the geological shielding interval CD and the first station 1 is/>The distance of the geological shielding section CD from the second station 2 is/>，/>。
Because the cell search and random access of the user terminal are implemented in the geological shielding interval CD and are influenced by geological shielding, the time increase influences the communication persistence and stability of the user terminal, and in the embodiment, the first base station and the second base station are switched outside the geological shielding interval CD, so that the unstable communication caused by the influence of geological shielding on the cell search and random access of the user terminal implemented in the geological shielding interval CD is eliminated.
Taking the point E between the outside of the geological shielding interval CD and the first station 1, wherein the distance from the point E to the first station 1 is，，/>The length of the train; /(I)Taking 0.9-1.1 for the train speed impact coefficient, and when the train speed is in the range of 80-120 km/h/>Taking 1-1.1, and when the vehicle speed is less than 80 km/h/>Taking 0.9-1.
The first base station of the first station 1 radiates a first signal extension power 8 to the point E, the second base station of the second station 2 radiates a second signal extension power 9 to the point E, and the first signal extension power 8 and the second signal extension power 9 intersect at the point E, so that a train moving at a high speed is switched from the first base station accessed to the first station 1 to the second base station accessed to the second station 2 or from the second base station accessed to the second station 2 to the first base station accessed to the first station 1 at the point E outside the geological shielding section CD of the tunnel line 3, and after the switching is completed, the train enters the geological shielding section CD, so that the user terminal realizes the switching of different base stations outside the geological shielding section of the tunnel line 3, and the continuity, stability and reliability of the communication of the user terminal are improved.
Preferably, the power function of the first signal extension power 8The method comprises the following steps:
。
Power function of second signal extension power 9 The method comprises the following steps:
wherein, And/>The first base station switching compensation coefficient and the second base station switching compensation coefficient are respectively, and，/>，/>The amplitude compensation coefficient is taken to be 0.1-0.2.
The power setting compensation of the first signal extension power 8 and the second signal extension power 9 improves the signal strength when the user terminal is switched at the point E outside the geological shielding interval CD, thereby improving the synchronous rate of the user terminal and the base station and further improving the continuity, stability and reliability of the communication of the user terminal accessing the base station.
Example 3
This embodiment is based on embodiment 1 or embodiment 2.
Referring to fig. 4, a communication method for a train running on a fully enclosed line, comprising the steps of:
Step S1, after a train shielding door is closed, before a train runs from a first station 1 to a second station 2, a first base station of the first station 1 inquires service types of a plurality of user terminals (user terminals) in a train carriage, the service types of the user terminals are marked as 1 when the service types of the user terminals are telephone service, the service types of the user terminals are marked as 2 when the service types of the user terminals are data traffic service, and the service types of the user terminals are marked as 3 when the service types of the user terminals are other service;
Step S2, a first base station of the first station 1 inquires whether geological shielding exists in a tunnel line 3; if present, the first base station of the first station 1 transmits said traffic type and/or screen type to the second base station of the second station 2; if not, the first base station of the first station 1 does not transmit the traffic type to the second base station of the second station 2;
And S3, after receiving the service type and/or the shielding type, the second base station of the second station 2 adopts different random access processes of the user terminal when the train runs to the geological shielding position in the tunnel line 3 at a high speed.
Through the steps, different random access processes of the user terminal are adopted when the train is in the geological shielding position in the tunnel line 3 at high speed, the access time of different user terminal service types is reduced, and the continuity, stability and reliability of the user terminal access base station communication are improved.
In step S2, if geological shielding exists, marking as shielding type 1 when the geological shielding type is a point, and marking as shielding type 2 when the geological shielding type is an interval; the first base station of the first station 1 transmits the screen type to the second base station of the second station 2.
In step S3, if the shielding type is 1, the distance from the geological shielding point A in the tunnel line 3 to the first station 1 is taken asPreferably/>，/>Taking 0.25-0.4, the first base station of the first station 1 radiates a first signal adjustment power 6 to the geological shielding point A, the second base station of the second station 2 radiates a second signal adjustment power 7 to the geological shielding point A, and the first signal adjustment power 6 and the second signal adjustment power 7 intersect at the position A.
Preferably, the first signal adjusts the power function of the power 6The method comprises the following steps:
；
In the middle of Amplitude,/>Is angular frequency,/>For time, α is wavelength,/>To adjust the coefficient,/>The value is 0.7-0.9,/>Is a complex symbol.
The second signal adjusts the power function of the power 7The method comprises the following steps:
。
in step S3, the second base station of the second station 2 configures a dedicated random access preamble to the ue with service types 1 and 2, and the ue with service types 1 and 2 accesses the second base station by adopting a non-contention mode random access procedure, so as to improve the communication stability of the ue with service types 1 and 2.
In step S3, if the mask type is 2, the length of the geological mask interval CD is taken as，/>Taking the interval coefficient as 1/1000 to 1/500, the distance between the geological shielding interval CD and the first station 1 is/>The distance of the geological shielding section CD from the second station 2 is/>，/>。
Taking the point E between the outside of the geological shielding interval CD and the first station 1, wherein the distance from the point E to the first station 1 is，，/>Is the length of the train; /(I)Taking 0.9-1.1 for the train speed impact coefficient, and when the train speed is in the range of 80-120 km/h/>Taking 1-1.1, and when the vehicle speed is less than 80 km/h/>Taking 0.9-1.
The first base station of the first station 1 radiates a first signal extension power 8 to point E and the second base station of the second station 2 radiates a second signal extension power 9 to point E, the first signal extension power 8 and the second signal extension power 9 intersecting at point E.
Preferably, the power function of the first signal extension power 8The method comprises the following steps:
。
Power function of second signal extension power 9 The method comprises the following steps:
；
wherein, And/>The first base station switching compensation coefficient and the second base station switching compensation coefficient are respectively, and，/>，/>The amplitude compensation coefficient is taken to be 0.1-0.2.
In step S3, a second base station of the second station 2 configures a dedicated random access preamble to a ue with a service type 1, and the ue with the service type 1 accesses the second base station by adopting a non-contention mode random access procedure to improve the communication stability of the ue with the service type 1; the second base station of the second station 2 divides the user terminals with the service type of 2 into different subgroups, the number of the user terminals of each subgroup is not more than 4, each subgroup is allocated with the same ZC sequence, the subgroup is used as a unit to carry out synchronous channel with the second base station, the channel resource occupation amount of the user terminals with the service type of 2, which are synchronous with the second base station one by one, is reduced, the synchronous time is shortened, and the communication response rate is improved.
Example 4
This embodiment is based on embodiment 1, embodiment 2 and/or embodiment 3.
When the trains pass through the tunnel, the types or kinds of the trains are different, and the running speeds of the trains are different, for example, the running speeds of the high-speed rail and the common train are different, the Doppler frequency shift effect of the trains with high speed is more obvious under the condition of different speeds, so that the signals of the trains in the tunnel are poor, and in the condition, the signals can be improved by increasing the power of the first platform 1 and the second platform 2, but the power is increased, so that the energy consumption is increased.
Therefore, the movement of the train from the first station 1 to the second station 2 is exemplarily described, and the operation principle of the movement from the second station 2 to the first station 1 is the same and will not be described again. A photographing camera is provided at the first station 1.
The invention discloses a communication method for running a train on a fully-closed circuit, which comprises the following steps of:
and shooting the train head by using a camera to form a first image, and shooting the train tail by using the camera to form a second image.
Wherein the camera can take successive shots to obtain a first image having the locomotive of the train and a second image having the tail of the train.
The feature extraction is performed on the images continuously shot by the camera, and the train head and the train tail are judged according to the features in the images.
And determining the running speed of the train according to the time interval of the first image and the second image.
Wherein, because the time interval of the camera shooting is fixed, that is to say, the shooting frame number per second is fixed, the time interval of the first image and the second image is obtained according to the time interval of the camera shooting, and the running speed of the train is calculated by using the time interval of the first image and the second image.
And matching with preset signal transmitting power according to the running speed of the train to obtain target signal transmitting power.
The method comprises the steps of presetting a plurality of running speed intervals, wherein each running speed interval corresponds to signal transmitting power, so that after the running speed of a current train is obtained, the running speed is matched with the preset running speed interval, the interval where the running speed is located is obtained, then, the target signal transmitting power is determined according to the interval where the running speed is located, and then, the first station 1 can adjust the power according to the target signal transmitting power, so that the adjusted target transmitting power can be received after the train enters a tunnel, and communication in the train is ensured.
In embodiment 4, the first station 1 and the second station 2 may be closed when no train passes, and thus, the first station 1 and the second station 2 may be opened again when the train passes through the photographing region of the camera, thereby further reducing the power consumption of the first station 1 and the second station 2.
It should also be noted that the power transmitted by the first station 1 and the second station 2 is used to form communication signals in the tunnel, i.e. the train receives communication signals via conventional base stations outside the tunnel before it has not entered the tunnel, indicating that there are conventional base stations in addition to the first station 1 and the second station 2. In this case, the first station 1 communicates with the conventional base station, and when the first station 1 forms the target signal transmission power, the first station 1 simultaneously transmits a signal to the conventional base station, and the conventional base station transmits a start signal to the second station 2 after receiving the signal, and the second station 2 starts to operate after receiving the start signal transmitted from the conventional base station. That is, by the above means, it can be ensured that the first station 1 and the second station 2 remain in the sleep state when no train passes, and when a train passes, the first station 1 and the second station 2 are started based on the images captured by the cameras, thereby ensuring that the train can have a stable signal ready for reception when passing through the tunnel.
Finally, the image captured by the camera is transmitted to the computer, and then the computer performs calculations such as image feature extraction, and the computer is further capable of sending the calculation result, the formed target signal transmission power command to the first station 1, so that the first station 1 responds to the command to perform an action. The position of the camera may be set as required, and may be set, for example, on the first station 1 or may be set at a predetermined distance upstream of the first station 1.
Based on the same inventive concept, the embodiment of the application also provides an electronic device corresponding to the method of any embodiment, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the communication method of the train operation according to any embodiment.
Fig. 5 shows a more specific hardware architecture of the communication system according to this embodiment, where the device may include: a processor 1010, a memory 1020, an input/output interface 1030, a communication interface 1040, and a bus 1050. Wherein processor 1010, memory 1020, input/output interface 1030, and communication interface 1040 implement communication connections therebetween within the device via a bus 1050.
The processor 1010 may be implemented by a general-purpose CPU (Central Processing Unit ), a microprocessor, an Application SPECIFIC INTEGRATED Circuit (ASIC), or one or more integrated circuits, etc. for executing related programs to implement the technical solutions provided by the embodiments of the present application.
The memory 1020 may be implemented in the form of ROM (read only memory), RAM (Random AccessMemory ), static storage, dynamic storage, etc. Memory 1020 may store an operating system and other application programs, and when the embodiments of the present application are implemented in software or firmware, the associated program code is stored in memory 1020 and executed by processor 1010.
The input/output interface 1030 is used to connect with an input/output module for inputting and outputting information. The input/output module may be configured as a component in a device (not shown in the figure) or may be external to the device to provide corresponding functionality. Wherein the input devices may include a keyboard, mouse, touch screen, microphone, various types of sensors, etc., and the output devices may include a display, speaker, vibrator, indicator lights, etc.
Communication interface 1040 is used to connect communication modules (not shown) to enable communication interactions of the present device with other devices. The communication module may implement communication through a wired manner (such as USB, network cable, etc.), or may implement communication through a wireless manner (such as mobile network, WIFI, bluetooth, etc.).
Bus 1050 includes a path for transferring information between components of the device (e.g., processor 1010, memory 1020, input/output interface 1030, and communication interface 1040).
It should be noted that although the above-described device only shows processor 1010, memory 1020, input/output interface 1030, communication interface 1040, and bus 1050, in an implementation, the device may include other components necessary to achieve proper operation. Furthermore, it will be understood by those skilled in the art that the above-described apparatus may include only the components necessary for implementing the embodiments of the present application, and not all the components shown in the drawings.
Based on the same inventive concept, the present application also provides a non-transitory computer readable storage medium storing computer instructions for causing the computer to perform the downlink communication method under high-speed movement according to any of the above embodiments, corresponding to the method of any of the above embodiments.
The computer readable media of the present embodiments, including both permanent and non-permanent, removable and non-removable media, may be used to implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps described in connection with the embodiments disclosed herein may be embodied in electronic hardware, in computer software, or in a combination of the two, and that the elements and steps of the examples have been generally described in terms of function in the foregoing description to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It should be noted that, the embodiment numbers of the present invention are only for description, and do not represent the advantages and disadvantages of the embodiments.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (6)
1. A communication method for a train running on a fully enclosed line, the fully enclosed line comprising at least a first station, a second station and a tunnel line between the first station and the second station; the first station is provided with a first base station, and the second station is provided with a second base station; the method is characterized by comprising the following steps of:
S1, under the condition that a train shielding door leaves from the first station to drive to the second station in a closed state, a communication connection signal transmitted by a user terminal in a carriage of the train is acquired by the first base station;
S2, the first base station judges the communication type according to the communication connection signal, and judges whether geological shielding of the communication connection signal exists in the tunnel line according to the communication type;
If so, the first base station forwards the communication connection signals with the geological shielding service type and/or shielding type to the second base station;
if not, the first base station does not send the service type to the second base station;
s3, after the second base station receives the communication connection signal forwarded by the first base station, the train is in communication connection with the user terminal when running to the geological shielding section in the tunnel line; wherein,
In step S2, if the geological shielding exists, the service type is phone service, data traffic service or other services; the shielding type is a point or an interval;
In step S3, the second base station configures a dedicated random access preamble for the user terminal whose service type is the telephone service and the data traffic service; the service type is the telephone service and the user terminal of the data flow service, and a non-competition mode random access process is adopted to access the second base station;
The length of the tunnel line is In step S3, if the service type of the geological shield is the telephone service, the distance between the geological shield point a in the tunnel line and the first station is taken as/>，/>，/>Taking 0.25-0.4, radiating a first signal adjustment power to a geological shielding point A by the first base station, radiating a second signal adjustment power to the geological shielding point A by the second base station, and intersecting the first signal adjustment power and the second signal adjustment power at the point A;
the first signal adjusts a power function of the power The method comprises the following steps:
，
power function of second signal regulated power The method comprises the following steps:
wherein B is the amplitude of the transmission power, Is angular frequency,/>For time, α is wavelength,/>To adjust the coefficient,/>The value is 0.7-0.9,/>In imaginary units.
2. The method of claim 1, wherein,
In step S3, if the type of the geological shielding is a section, the length of the geological shielding section CD is taken as，/>Taking the interval coefficient as 1/1000 to 1/500, the distance between the geological shielding interval CD and the first station is/>The distance between the geological shielding section CD and the second station is/>，/>; When the speed of the train is in the range of 80-120 km/h/>Taking 1-1.1, and when the speed of the train is less than 80 km/h/>Taking 0.9-1;
taking a point E between the outside of the geological shielding region CD and the first station, wherein the distance from the point E to the first station 1 is as follows ，，/>The length of the train; /(I)Taking 0.9-1.1 for the train speed impact coefficient;
the first base station radiates a first signal extension power to point E and the second base station radiates the second signal extension power to point E, the first signal extension power and the second signal extension power intersecting at point E.
3. The method of claim 2, wherein,
Power function of the first signal extension powerThe method comprises the following steps:
；
power function of the second signal extension power The method comprises the following steps:
；
wherein, And/>The first base station switching compensation coefficient and the second base station switching compensation coefficient are respectively, and，/>，/>The amplitude compensation coefficient is taken to be 0.1-0.2.
4. The method of claim 3, wherein,
In step S3, the second base station configures a dedicated random access preamble to the ue with the service type of the telephone service, and the second base station accesses the second base station by adopting a non-contention mode random access procedure to the ue with the service type of the data traffic service; the second base station divides the user terminals with the service type of the data flow service into different subgroups, the number of the user terminals in each subgroup is not more than 4, each subgroup is allocated with the same ZC sequence, and the subgroup is taken as a unit to carry out synchronous channel with the second base station.
5. A communication system for a rail transit system having a fully enclosed line, the rail transit system comprising at least a first station, a second station, and a tunnel line between the first station and the second station; the communication system comprises a first base station arranged at the first station and a second base station arranged at the second station, wherein the communication method as claimed in any one of claims 1 to 4 is adopted between the first base station and the second base station.
6. A rail transit system comprising a first station and a second station and a totally enclosed line between the first station and the second station, said totally enclosed line being provided with a communication system according to claim 5 or communicating by a communication method according to any one of claims 1 to 4.
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