CN111194017B

CN111194017B - LTE-M network coverage optimization adjustment method and system for rail transit

Info

Publication number: CN111194017B
Application number: CN202010010581.2A
Authority: CN
Inventors: 周祖望; 杜仲; 郭见兵; 余刚
Original assignee: Wuhan Hongxin Technology Development Co Ltd
Current assignee: Wuhan Feng And Zhida Information Technology LLC; Wuhan Hongxin Technology Development Co Ltd
Priority date: 2020-01-06
Filing date: 2020-01-06
Publication date: 2022-10-04
Anticipated expiration: 2040-01-06
Also published as: CN111194017A

Abstract

The embodiment of the invention provides an optimization adjustment method and system for LTE-M network coverage of rail transit, wherein the method comprises the following steps: in the running process of the train, a vehicle-mounted access unit TAU of the train reports MR information to subordinate base stations along the railway in sequence; each base station analyzes corresponding MR data from the MR information and uploads the analyzed MR data to an Operation Maintenance Center (OMC); and the operation maintenance center OMC analyzes the MR data corresponding to each base station, determines the optimized adjustment parameters of each base station needing parameter adjustment, and sends the optimized adjustment parameters to the corresponding base stations, so that the base stations can perform optimized adjustment on the base station parameters according to the corresponding optimized adjustment parameters. The embodiment of the invention can automatically analyze the MR data and determine the adjustment value of the base station parameter, thereby realizing the automation of network coverage optimization and improving the network optimization efficiency.

Description

LTE-M network coverage optimization adjustment method and system for rail transit

Technical Field

The invention belongs to the technical field of communication, and particularly relates to an LTE-M network coverage optimization adjustment method and system for rail transit.

Background

The LTE-M (Long Term Evolution-Metro) has become the mainstream bearer technology of a Data Communication System (DCS) System in the rail transit industry at present, and is mainly used for bearing a CBTC (Communication Based Train Control System) and other comprehensive bearer services, and a 1.8GHz private network frequency band is adopted, and a wireless coverage provided by the LTE-M wireless Communication System includes: a main line (including a return line and a connecting line), an entrance section/field line, a section/field garage, a test line and the like.

The CBTC service in the rail transit industry has strict requirements on time delay and packet loss rate, which is required to ensure that LTE signals along the running track of a train are well covered, and the LTE-M specification requires: the full line meets the minimum requirements that RSRP (Reference Signal Receiving Power) is more than or equal to-95dBm and SINR (Signal to Interference plus Noise Ratio) is more than or equal to 3.

The field debugging of the rail traffic engineering is divided into two stages of static debugging and dynamic debugging, the network coverage road test and optimization in the static debugging stage need field testing personnel to carry out manual road test by using a road test terminal, the whole line of RSRP and SINR distribution values are obtained through the road test terminal, and then whether the coverage quality meets the requirements is analyzed. On the other hand, a remote switching zone may have a phenomenon of power imbalance or unreasonable switching parameter configuration, a phenomenon of too late switching or even failure switching may occur in a switching process of a Train Access Unit (TAU), and optimization work of base station power and switching parameters is required.

Disclosure of Invention

In order to overcome the existing problems or at least partially solve the problems, embodiments of the present invention provide an LTE-M network coverage optimization adjustment method and system for rail transit.

According to a first aspect of the embodiments of the present invention, there is provided a method for optimizing and adjusting LTE-M network coverage for rail transit, including:

in the running process of a train, a vehicle-mounted access unit TAU of the train sequentially reports MR (measurement Report) information to subordinate base stations along the railway at regular intervals;

each base station analyzes corresponding MR data from the MR information and uploads the analyzed MR data to an Operation and Maintenance Center (OMC);

and the operation maintenance center OMC analyzes the MR data corresponding to each base station, determines the optimized adjustment parameters of each base station needing parameter adjustment, and sends the optimized adjustment parameters to the corresponding base stations, so that the base stations can perform optimized adjustment on the base station parameters according to the corresponding optimized adjustment parameters.

On the basis of the technical scheme, the invention can be improved as follows.

Optionally, in the running process of the train, the periodically reporting the MR information to the subordinate base stations along the railway by the train-mounted access unit TAU of the train in sequence includes:

according to configuration information issued by a base station, a train-mounted access unit TAU of the train reports MR information to a subordinate base station periodically according to the configuration information, wherein the configuration information comprises a time interval period of reporting the MR information to the base station by the train-mounted access unit TAU of the train.

Optionally, the analyzing, by the operation and maintenance center OMC, the MR data corresponding to each base station, and determining the optimized parameter of each base station that needs to be parameter-adjusted includes:

screening out MR data of overlapping coverage areas of a service cell and a target cell of a switching zone according to the MR data;

according to the MR data of the overlapping coverage areas of the service cell and the target cell, recording the duration time Toff1 of switching leaving and the duration time T1 of switching zone when the train runs in the forward direction, and the duration time Toff2 of switching leaving and the duration time T2 of switching zone when the train runs in the reverse direction for the same base station;

and determining whether the base station needs to carry out parameter adjustment or not according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if so, determining an optimized adjustment parameter corresponding to the base station.

Optionally, the recording, for the same base station, the switch-off duration Toff1 and the switch zone duration T1 when the train travels in the forward direction, and the switch-off duration Toff2 and the switch zone duration T2 when the train travels in the reverse direction according to the overlapping coverage MR data of the serving cell and the target cell includes:

according to the MR data of the overlapping coverage areas of the service cell and the target cell, for the same base station, recording the time T11 of entering the overlapping coverage area when the train runs in the forward direction, the time T12 of switching and the time T13 of leaving the overlapping coverage area, wherein the time Tin1= T12-T11 of entering switching, the time Toff1= T13-T12 of leaving switching and the time T1= Tin1+ Toff1 of switching zone; and (c) a second step of,

and recording the time T21 of entering the overlapping coverage area when the train runs in the reverse direction, and the time T22 of switching and the time T23 of leaving the overlapping coverage area when the train runs in the reverse direction, wherein the switching entering duration is Tin2= T22-T21, the switching leaving duration is Toff2= T23-T22, and the switching zone duration is T2= Tin2+ Toff2.

Optionally, the determining, according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, whether the base station needs to perform parameter adjustment, and if yes, determining the optimized adjustment parameter corresponding to the base station includes:

when Toff1 is less than 1/4T 1 and Toff2 is more than 3/4T 2, increasing the power of the target cell base station by a first preset value;

toff1 > 3/4 t1 and Toff2 < 1/4 t2, the power of the target cell base station is reduced by a first preset value.

when 1/4T 1 is less than Toff1 and less than 3/4T 1 and Toff2 is less than 1/4T 2, increasing the cell personalized offset CIO of the target cell by a second preset value;

when Toff1 < 1/4 × t1 and 1/4 × t2 < Toff2 < 3/4 × t2, the Cell individualized Offset CIO (Cell Individual Offset) of the serving Cell is increased by a second preset value.

when 1/4 t1 < Toff1 < 3/4 t1 and Toff2 > 3/4 t2, reducing the cell personalized offset CIO of the target cell by a third preset value;

when Toff1 > 3/4 t1 and 1/4 t2 < Toff2 < 3/4 t2, the cell individual offset CIO of the serving cell is decreased by a third preset value.

when Toff1 is less than 1/4 t1 and Toff2 is less than 1/4 t2, the cell individual offset CIO of the target cell and the serving cell is increased by a fourth preset value.

when Toff1 > 3/4 t1 and Toff2 > 3/4 t2, the cell individual offset CIO of both the target cell and the serving cell is reduced by a fifth preset value.

According to a second aspect of the embodiment of the invention, an LTE-M network coverage optimization and adjustment system for rail transit is provided, which comprises a train vehicle-mounted access unit ATU, a base station along a railway and an operation and maintenance center OMC;

the vehicle-mounted access unit ATU is used for sequentially reporting MR information to the subordinate base stations along the railway in a regular mode in the operation process;

each base station is used for analyzing corresponding MR data from the MR information and uploading the analyzed MR data to an Operation Maintenance Center (OMC);

and the operation maintenance center OMC is used for analyzing the MR data corresponding to each base station, determining the optimized adjustment parameters of each base station needing parameter adjustment, and sending the optimized adjustment parameters to the corresponding base stations, so that the base stations can perform optimized adjustment on the base station parameters according to the corresponding optimized adjustment parameters.

The embodiment of the invention provides an LTE-M network coverage optimization adjustment method and system for rail transit.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic overall flow chart of an LTE-M network coverage optimization adjustment method for rail transit according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a switched-band power imbalance scenario according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a switching zone single-way switching late scene according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of a switched-band bi-directional late scene according to an embodiment of the present invention;

FIG. 5 is an overall flow chart of the operation and maintenance center for MR data analysis;

fig. 6 is a schematic diagram of an overall structure of an LTE-M network coverage optimization adjustment system for rail transit according to an embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.

Fig. 1 is a schematic overall flow diagram of an LTE-M network coverage optimization adjustment method for rail transit according to an embodiment of the present invention, and the method includes:

in the running process of the train, a vehicle-mounted access unit TAU of the train reports MR information to subordinate base stations along the railway in sequence;

each base station analyzes corresponding MR data from the MR information and uploads the analyzed MR data to an operation maintenance center OMC;

and the operation maintenance center OMC analyzes the MR data corresponding to each base station, determines the optimization adjustment parameters of each base station needing parameter adjustment, and sends the optimization adjustment parameters to the corresponding base stations, so that the base stations can perform optimization adjustment on the base station parameters according to the corresponding optimization adjustment parameters.

It can be understood that, when parameters of base stations along a railway are adjusted, drive tests need to be carried out manually, and the process is complicated. The embodiment of the invention collects MR data of the subordinate base stations along the railway through the vehicle-mounted access unit of the train, the OMC analyzes the MR data to judge whether each base station needs to adjust the parameters, and if the base stations need to be adjusted, the optimal adjustment parameters of the base stations are determined. After the optimization adjustment parameters of each base station are determined, the optimization adjustment parameters of all the base stations are issued to the base stations needing to be adjusted at one time, so that the base stations adjust the parameters of the base stations according to the corresponding optimization adjustment parameters.

The embodiment of the invention can automatically analyze the MR data and determine the adjustment value of the base station parameter, thereby realizing the automation of network coverage optimization and improving the network optimization efficiency.

As an optional embodiment, in the running process of a train, the periodically reporting the MR information to the subordinate base stations along the railway by the train-mounted access unit TAU of the train in sequence includes:

It can be understood that the vehicle-mounted access unit TAU reports MR information periodically according to configuration information issued by a base station, where the configuration information includes a time interval period for the TAU to report the MR information to the base station, all base stations along the train running line receive the TAU MR information, analyze the TAU MR information and report the TAU MR information to an OMC (Operation and Maintenance Center), the OMC stores MR data received by all base stations reported by the train TAU, automatically analyzes the recorded MR data according to an algorithm of the scheme to form a base station parameter optimization scheme, and issues the TAU MR information to the base station needing parameter adjustment once to make the TAU MR data effective, as shown in fig. 1.

As an optional embodiment, the analyzing, by the operation and maintenance center OMC, the MR data corresponding to each base station, and determining the optimized parameter of each base station that needs to be subjected to parameter adjustment includes:

according to the MR data of the overlapped coverage areas of the service cell and the target cell, recording the switching-off duration Toff1 and the switching-band duration T1 when the train runs in the forward direction, and the switching-off duration Toff2 and the switching-band duration T2 when the train runs in the reverse direction for the same base station;

and determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if so, determining an optimized adjustment parameter corresponding to the base station.

It can be understood that the train access unit TAU of the train reports MR information to the subordinate base stations along the railway in sequence at regular intervals according to the configuration information of the base stations, for example, the TAU reports MR information to all the base stations at intervals of 240ms, where the MR information includes RSRP (Reference Signal Receiving Power) and RSRQ (Reference Signal Receiving Quality) information of each serving cell.

When the base station receives the MR information, MR data containing information such as time, base station PCI, service cell RSRP, service cell RSRQ, neighbor cell RSRP, neighbor cell RSRQ and the like are analyzed from the MR information, and the analyzed MR data are uploaded to an operation and maintenance center OMC. And the OMC screens the MR data of the overlapping coverage areas of the service cell and the target cell according to the MR data.

The operation and maintenance center OMC records the switching departure duration Toff1 and the switching zone duration T1 when the train is traveling in the forward direction and the switching departure duration Toff2 and the switching zone duration T2 when the train is traveling in the reverse direction for the same base station based on the MR data. The train is driven in the forward direction, namely the train is driven towards one direction, and the train is driven in the reverse direction, namely the direction when the train returns.

And determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if so, determining the optimized adjustment parameters corresponding to the base station. The adjustment of the parameters is carried out in the same way for each base station along the railway.

As an alternative embodiment, the operation and maintenance center OMC recording the switching-off duration Toff1 and the switching-zone duration T1 when the train is running in the forward direction and the switching-off duration Toff2 and the switching-zone duration T2 when the train is running in the reverse direction for the same base station according to the overlapping coverage MR data of the serving cell and the target cell includes:

according to the MR data of the overlapping coverage areas of the service cell and the target cell, for the same base station, recording the time T11 of entering the overlapping coverage area when the train runs in the forward direction, the time T12 of switching and the time T13 of leaving the overlapping coverage area, wherein the time Tin1= T12-T11 of entering switching, the time Toff1= T13-T12 of leaving switching and the time T1= Tin1+ Toff1 of switching zone; and the number of the first and second groups,

and recording the time T21 of entering the overlapping coverage area when the train runs in the reverse direction, and the time T22 of switching and the time T23 of leaving the overlapping coverage area, wherein the time T2= T22-T21 of entering the switching, the time Toff2= T23-T22 of leaving the switching and the time T2= Tin2+ Toff2 of switching.

As an optional embodiment, determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if yes, determining the optimized adjustment parameter corresponding to the base station includes:

As an optional embodiment, the determining, according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, whether the base station needs to perform parameter adjustment, and if so, determining the optimized adjustment parameter corresponding to the base station includes:

when toff1 < 1/4 t1 and 1/4 t2 < toff2 < 3/4 t2, the cell individual offset CIO of the serving cell is increased by a second preset value.

As an optional embodiment, the determining, according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, whether the base station needs to perform parameter adjustment, and if yes, determining the optimized adjustment parameter corresponding to the base station includes:

when 1/4T 1 < Toff1 < 3/4T 1 and Toff2 > 3/4T 2, reducing the cell individual offset CIO of the target cell by a third preset value;

It can be understood that, the operation and maintenance center OMC determines whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if so, determines the optimized adjustment parameter corresponding to the base station.

Wherein, when Toff1 and T1 and Toff2 and T2 satisfy the following five conditions, it indicates that the parameters of the base station need to be adjusted, wherein, the serving cell base station is called PCI1, the target cell base station is called PCI2, and the five different conditions are as follows:

(1) Power imbalance scenario: when Toff1 is less than 1/4T 1 and reverse Toff2 is more than 3/4T 2, the power of the PCI2 cell base station is increased by 3dB (see figure 2); similarly, when Toff1 is more than 3/4T 1, and Toff2 is less than 1/4T 2, the power of the PCI2 cell base station is reduced by 3dB;

(2) The unidirectional switching is too late: when 1/4 t1 < Toff1 < 3/4 t1 and Toff2 < 1/4 t2, increase PCI2 Cell CIO (Cell Individual Offset) by 3dB (see fig. 3); similarly, when Toff1 is less than 1/

4T

1 and 1/4T 2 is less than Toff2 and less than 3/4T 2, the CIO 3dB of the PCI1 cell is increased;

(3) One-way handover is too early: when 1/4 t1 < Toff1 < 3/4 t1 and Toff2 > 3/4 t2, reducing the PCI2 cell CIO 3dB; similarly, when Toff1 is greater than 3/

4T

1 and 1/4T 2 is greater than Toff2 and less than 3/4T 2, the CIO 3dB of the PCI1 cell is reduced;

(4) The bidirectional switching is too late: increasing PC11 and PCI2 cell CIO 3dB when Toff1 < 1/4 t1 and Toff2 < 1/4 t2 (see fig. 4);

(5) Bidirectional handover is too early: when Toff1 > 3/4 t1 and Toff2 > 3/4 t2, it is determined that the bidirectional handover is too early, and PC11 and PCI2 cell CIO 3dB are reduced.

Referring to fig. 5, a specific flowchart of the operation and maintenance center OMC for analyzing MR data is specifically shown:

step 1, if Toff1 is larger than 3/4T 1, the value of Toff2 is continuously analyzed, otherwise, step 4 is executed, if Toff2 is larger than 3/4T 2, the CIO 3dB of the PCI1 and PCI2 cells is reduced, the step 9 is skipped to store the optimized adjustment parameters (namely the CIO 3dB of the PCI1 and PCI2 cells is reduced), otherwise, step 2 is executed;

step 2, if Toff2 is less than 1/4T 2, reducing the power of the PCI2 cell by 3dB, skipping to step 9 to store parameters, otherwise, executing step 3;

3, reducing the CIO 3dB of the PCI1 cell, and skipping to the step 9 to store parameters;

step 4, if Toff1 is less than 1/4T 1, continue analyzing the value of Toff2, otherwise, executing step 7, if Toff2 is greater than 3/4T 2, increasing the power of the PCI2 cell by 3dB, skipping to step 9 to save the parameters, otherwise, executing step 5;

step 5, if Toff2 is less than 1/4T 2, increasing PCI1 and PCI2 cell CIO 3dB, skipping to step 9 to store parameters, otherwise executing step 6;

step 6, adding a PCI2 cell CIO 3dB, and skipping to the step 9 to store parameters;

7, if Toff2 is larger than 3/4T 2, reducing the CIO 3dB of the PCI2 cell, skipping to the step 9 to store parameters, otherwise, executing the step 8;

step 8, if Toff2 is less than 1/4T 2, increasing the CIO 3dB of the PCI2 cell;

and 9, saving the parameters.

In another embodiment of the present invention, an LTE-M network coverage optimization adjustment system for rail transit is provided, which is used to implement the methods in the foregoing embodiments. Therefore, the description and definition in the embodiments of the LTE-M network coverage optimization adjustment method for rail transit may be used for understanding each execution module in the embodiments of the present invention. Fig. 6 is a schematic diagram of an overall structure of an LTE-M network coverage optimization adjustment system for rail transit according to an embodiment of the present invention, where the system includes a train vehicle-mounted access unit ATU, base stations along a railway, and an operation and maintenance center OMC.

The system comprises a vehicle-mounted access unit ATU, a plurality of subordinate base stations and a plurality of access units, wherein the vehicle-mounted access unit ATU is used for sequentially reporting MR information to the subordinate base stations along the railway at regular intervals in the operation process;

The LTE-M network coverage optimization and adjustment system for rail transit provided by the embodiment of the present invention corresponds to the LTE-M network coverage optimization and adjustment method for rail transit provided by the foregoing embodiment, and for the relevant technical features of the LTE-M network coverage optimization and adjustment system for rail transit, reference may be made to the relevant technical features of the LTE-M network coverage optimization and adjustment method for rail transit provided by the foregoing embodiments, which are not described herein again.

Compared with the existing drive test and manual analysis of a drive test terminal, the LTE-M network coverage optimization adjustment method and system for rail transit provided by the embodiment of the invention have the following advantages compared with the mode of manually adjusting the base station parameters according to the analysis result:

(1) The network optimization work of the whole-line base station equipment can be implemented in batch according to the MR data collected by the train-mounted access unit TAU during the test of the motor train without a special drive test link, so that the drive test and network optimization time is saved;

(2) The MR data analysis can be automatically carried out and the adjustment value of the base station parameter can be determined, so that the automation of network coverage optimization is realized, and the network optimization efficiency is improved;

(3) The network optimization data source is MR data collected by a TAU of an actually-running train, the measurement precision is superior to that of a drive test terminal, and accurate analysis of network coverage quality along a railway is facilitated.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. An LTE-M network coverage optimization adjustment method for rail transit is characterized by comprising the following steps:

the OMC analyzes the MR data corresponding to each base station, determines the optimized adjustment parameters of each base station needing parameter adjustment, and sends the optimized adjustment parameters to the corresponding base station, so that the base station can perform optimized adjustment on the base station parameters according to the corresponding optimized adjustment parameters;

the OMC analyzes the MR data corresponding to each base station, and the determining of the optimized parameters of each base station needing parameter adjustment comprises the following steps:

2. The optimization and adjustment method according to claim 1, wherein in the running process of the train, the regular reporting of the MR information to the subordinate base stations along the railway by the train-mounted access units TAU of the train in sequence comprises:

according to configuration information issued by a base station, a train-mounted access unit TAU of a train reports MR information to a subordinate base station along a railway regularly according to the configuration information, wherein the configuration information comprises a time interval period for reporting the MR information to the base station by the train-mounted access unit TAU of the train.

3. The optimization adjustment method according to claim 1, wherein the recording of the duration Toff1 of switching off and the duration T1 of switching zone when the train is traveling in forward direction and the duration Toff2 of switching off and the duration T2 of switching zone when the train is traveling in reverse direction for the same base station according to the MR data of the overlapping coverage areas of the serving cell and the target cell comprises:

according to the MR data of the overlapping coverage areas of the service cell and the target cell, for the same base station, recording the time T11 when the train enters the overlapping coverage area during forward driving, the time T12 when switching occurs and the time T13 when the train leaves the overlapping coverage area, wherein the switching entering duration time Tin1= T12-T11, the switching leaving duration time Toff1= T13-T12 and the switching zone duration time T1= Tin1+ Toff1; and the number of the first and second groups,

4. The method according to claim 3, wherein the determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if so, the determining the optimized adjustment parameter corresponding to the base station includes:

5. The method as claimed in claim 3, wherein the determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if yes, the determining the optimized adjustment parameter corresponding to the base station comprises:

when 1/4T 1 is more than Toff1 and less than 3/4T 1 and Toff2 is more than 1/4T 2, increasing the cell individual offset CIO of the target cell by a second preset value;

6. The method according to claim 3, wherein the determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if so, the determining the optimized adjustment parameter corresponding to the base station includes:

7. The method as claimed in claim 3, wherein the determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if yes, the determining the optimized adjustment parameter corresponding to the base station comprises:

8. The method as claimed in claim 3, wherein the determining whether the base station needs to perform parameter adjustment according to the relationship between Toff1 and T1 and the relationship between Toff2 and T2, and if yes, the determining the optimized adjustment parameter corresponding to the base station comprises:

9. An LTE-M network coverage optimization and adjustment system for rail transit is characterized by comprising a train-mounted access unit ATU, a base station along a railway and an operation and maintenance center OMC;

the TAU is used for sequentially reporting MR information to the subordinate base stations along the railway at regular intervals in the operation process;

the operation maintenance center OMC is used for analyzing the MR data corresponding to each base station, determining the optimized adjustment parameters of each base station needing parameter adjustment, and sending the optimized adjustment parameters to the corresponding base stations, so that the base stations can perform optimized adjustment on the base station parameters according to the corresponding optimized adjustment parameters;

the analyzing the MR data corresponding to each base station and determining the optimized parameters of each base station that need to be subjected to parameter adjustment includes:

screening out MR data of an overlapping coverage area of a service cell and a target cell of a switching zone according to the MR data;