JP2000229571A - Train wireless communication system and hand-over execution method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily change a hand-over point by switching a wireless station of a communication target, and changing the wireless frequency of a moving station into the wireless frequency of a next communication target when the running position of a train measured by a position measurement means exceeds the running position stored in a storing means. SOLUTION: When the running position of a train 22 is within the range of wireless communication of a wireless station 27a, the transmission frequency of a transmission/ reception unit in a movable station wireless device 23 is set to be the reception frequency fA2 of the wireless station 27a while the reception frequency is set to be the transmission frequency fA1 of the wireless station 27a. Then, when the running position of the train 22 is moved in the wireless communication region of a wireless station 27b, the transmission and reception frequencies of a transmitter/receiver in the moving station wireless device 23 are respectively set to be the reception and transmission frequencies fB2, fB1 of the station 27b. Changeover of the frequencies are controlled in this way according to the result of detection of the running position of the train 22 by a position measurement apparatus in the device 23 which detects that the train 22 has passed the vicinity of a ground side pickup 26 through a vehicle side pickup 25.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a train radio system and a handover execution method for sequentially switching a radio base station with which a mobile station communicates as a train moves.

[0002]

2. Description of the Related Art FIG. 8 is a block diagram showing a conventional train radio system, in which 1 is a track (rail) on which a train 2 runs, 2 is a train running on a track 1, and 3 is a radio base. A mobile station radio, which performs radio communication with the station, 4 is a mobile station terminal such as a telephone connected to the mobile station radio 3, and 5 receives a terrestrial signal indicating the passage of the handover point from the terrestrials 6a, 6b. The upper child, 6a and 6b are installed along the track 1 and transmit the lower child signal, and the lower child 7a to 7c communicate with the mobile station radio 3 when the train 2 enters its own radio communication area. The radio base stations to be executed, 8 are radio base stations 7a to 7a to
A central unit 9c for controlling the central unit 7c is a central unit terminal such as a telephone connected to the central unit 8.

FIG. 9 is a block diagram showing a detailed configuration of a mobile station radio. In FIG. 9, reference numeral 11 denotes a mobile station when a vehicle child 5 receives a ground child signal indicating passage of a handover point from, for example, a ground child 6a. A mobile station CPU that outputs a frequency switching signal for instructing switching of the radio frequency (transmission frequency and reception frequency) of the transceiver 12, 12 is a mobile station transceiver of the mobile station radio 3, and 13 is a frequency output by the mobile station CPU 11. This is a synthesizer that switches a transmission frequency and a reception frequency according to a switching signal.

Next, the operation will be described. In the train radio system, adjacent radio base stations use different radio frequencies to avoid radio wave interference, and the transmitter frequency and the receiver frequency in the same radio base station are different.

Therefore, in order for the mobile station radio 3 mounted on the train 2 to perform radio communication with the radio base station, the radio frequency of the mobile station transceiver 12 in the mobile station radio 3 is set to the traveling position of the train 2. Need to change accordingly. That is,
It is necessary to match the radio frequency of the mobile station transceiver 12 with the radio frequency of the radio base station whose current position of the train 2 is the radio communication area. Hereinafter, changing the radio frequency of the mobile station transceiver 12 to the radio frequency of the next radio target is referred to as “handover”.

More specifically, the traveling position of the train 2 is a radio base.
If the mobile station is within the wireless communication area of the station 7a,
The transmission frequency of the transmitter 12 is the reception frequency of the radio base station 7a.
F _A2And the receiving frequency of the mobile station transceiver 12 is set to zero.
F, which is the transmission frequency of the line base station 7a_A1Set to. Ma
The running position of the train 2 is in the wireless communication area of the wireless base station 7b.
, The transmission frequency of the mobile station transceiver 12 is
F which is the reception frequency of the radio base station 7b_B2Set and move
The reception frequency of the station transceiver 12 is changed to the transmission frequency of the radio base station 7b.
The wave number f _B1Set to. Also, the traveling position of train 2 is
When it is within the wireless communication area of the wireless base station 7c,
The transmission frequency of the station transceiver 12 is changed to the reception frequency of the radio base station 7c.
The wave number f_C2And the reception frequency of the mobile station transceiver 12
The wave number is represented by f which is the transmission frequency of the radio base station 7c. _C1Set to
You.

Here, the handover of the train radio system will be specifically described. First, at the point where the handover is performed (the point where the radio frequency is switched), the ground child 6a,
6b is installed, so that the train 2
, The vehicle child 5 receives a ground child signal indicating the passage of the handover point from the ground children 6a and 6b.

The mobile station CPU 1 of the mobile station radio 3
When the vehicle child 5 receives the ground child signal, it recognizes the passage of the handover point, and transmits a frequency switching signal to the synthesizer 13 of the mobile station transceiver 12. For example, when the vehicle child 5 receives a ground child signal from the ground child 6a, the mobile station CPU 11 changes the radio frequency of the mobile station transceiver 12 from the radio frequency of the radio base station 7a to the radio frequency of the radio base station 7b. Therefore, the transmission frequency of the mobile station transceiver 12 is changed to the reception frequency f _B2 of the radio base station 7b,
A frequency switching signal indicating that the reception frequency of the mobile station transceiver 12 is changed to the transmission frequency f _B1 of the radio base station 7b is transmitted to the synthesizer 13.

When receiving the frequency switching signal from the mobile station CPU 11, the synthesizer 13 changes the transmission frequency and the reception frequency of the mobile station transceiver 12 according to the frequency switching signal, and executes the handover. This allows
The mobile station terminal 4 and the central unit terminal 9 can continuously execute wireless communication via the mobile station radio 3 and the radio base station.

[0010]

Since the conventional train radio system is configured as described above, when the upper child 5 receives the above ground child signals from the above ground children 6a and 6b, a handover is executed. Since it is necessary to install the ground child at all points where the operation is performed, the equipment cost and maintenance cost become enormous, and when changing the handover point, the installation position of the ground child must be changed However, there is a problem that much labor is required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is possible to reduce equipment costs, maintenance costs, and the like, and to easily change a handover point in a train radio system and a handover system. The aim is to get an execution method.

[0012]

A train radio system according to the present invention is arranged such that when the running position of the train measured by the position measuring means exceeds the running position stored in the storing means,
In order to switch the radio base station to be communicated with, the radio frequency of the mobile station is changed to the radio frequency of the next communication target.

[0013] In the train radio system according to the present invention, when a ground child signal is received from a ground child, the running position of the train is measured with reference to the point at which the ground child signal is received.

[0014] The train radio system according to the present invention has a GP
The GPS data is received from the S satellite, and the traveling position of the train is detected.

[0015] In the train radio system according to the present invention, storage means is configured using an external storage device.

[0016] The train radio system according to the present invention is configured to receive a traveling position at which a handover is performed from a specific radio base station at a specific time.

In the train radio system according to the present invention, before the train arrives at the traveling position where the handover is performed, the traveling position where the handover is performed is received from the radio base station currently communicating.

[0018] The handover execution method according to the present invention comprises:
The traveling position of the train is compared with the traveling position at which the handover is performed. If the traveling position of the train exceeds the traveling position at which the handover is performed, the radio frequency of the mobile station is switched to the next communication to switch the radio base station to be communicated. The radio frequency is changed to the target radio frequency.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a configuration diagram showing a train radio system according to Embodiment 1 of the present invention.
Is a track (rail) on which the train 22 runs, and 22 is a track 21
, A mobile station radio (mobile station) 23 for performing radio communication with a radio base station, and 24 a mobile station radio 2
3 is a mobile station terminal such as a telephone connected to 25;
A vehicle arm (position measuring means) for receiving a ground signal indicating the absolute position from 6 (position measuring means), 26 is installed along the track 21 and transmits a ground signal (position measuring means), 27a-2
7c is a radio base station that executes radio communication with the mobile station radio 23 when the train 22 enters its radio communication area, 28 is a central unit that controls the radio base stations 27a to 27c, and 29 is connected to the central unit 28. Central device terminal such as a telephone set.

FIG. 2 is a block diagram showing the detailed configuration of the mobile station radio. In FIG.
, A position measuring instrument (position measuring means) for measuring the running position of the train 22 with reference to the point at which the ground child signal is received, the handover information 32 (handover information The mobile station internal memory (storage means) 33 stores the running position of the train 22 measured by the position measuring device 31 when the running position of the train 22 exceeds the running position at which the handover is executed.
4, a mobile station CPU (frequency changing means) for outputting a frequency switching signal for instructing switching of radio frequencies (transmission frequency and reception frequency), 34 is a mobile station transceiver of the mobile station radio 23, and 35 is a mobile station CPU 33. It is a synthesizer (frequency changing means) for switching between a transmission frequency and a reception frequency according to a frequency switching signal to be output. FIG. 3 is a flowchart showing a handover execution method according to the first embodiment of the present invention.

Next, the operation will be described. In the train radio system, adjacent radio base stations use different radio frequencies to avoid radio wave interference, and the transmitter frequency and the receiver frequency in the same radio base station are different.

Therefore, in order for the mobile station radio 23 mounted on the train 22 to perform radio communication with the radio base station,
It is necessary to change the radio frequency of the mobile station transceiver 34 in the mobile station radio 23 according to the running position of the train 22. That is, the radio frequency of the mobile station transceiver 34 is
It is necessary to match the radio frequency of the radio base station whose current position is the radio communication area. Hereinafter, the mobile station transceiver 34
The change of the radio frequency from the radio frequency to the radio frequency of the next radio target is referred to as “handover”.

Specifically, the traveling position of the train 22 is
If the mobile station is within the wireless communication area of the ground station 27a,
The transmission frequency of the receiver 34 is set to the reception frequency of the radio base station 27a.
The number f_A2And the receiving frequency of the mobile station transceiver 34
Is the transmission frequency of the radio base station 27a._A1Set to
You. Also, the traveling position of the train 22 is determined by the absence of the wireless base station 27b.
When the mobile station is within the line communication area,
The transmission frequency is set to f which is the reception frequency of the radio base station 27b. _B2To
Set the reception frequency of the mobile station transceiver 34 to the radio base station
F, which is the transmission frequency of 27b_B1Set to. Also train
22 is within the wireless communication area of the wireless base station 27c.
In some cases, the transmission frequency of the mobile station transceiver 34 is
F, which is the reception frequency of the base station 27c _C2Set to mobile station
The reception frequency of the transceiver 34 is changed to the transmission frequency of the radio base station 27c.
The wave number f_C1Set to.

Here, the handover of the train radio system will be specifically described. First, the position measuring device 31
When the vehicle 2 passes near the ground child 26, the vehicle child 25 receives a ground child signal indicating the absolute position from the ground child 26 (step ST1). Then, the travel position 22 is measured (step ST2). That is, the position measuring device 31 measures the traveling position of the train 22 by converting the moving distance from the point at which the ground signal is received from the speedometer or the like of the train 22.

When the position measuring device 31 measures the running position of the train 22, the mobile station CPU 33 determines the running position of the train 22 and the handover information stored in the mobile station internal memory 32 (the running position at which the handover is performed). Are compared (step ST3), and when the running position of the train 22 exceeds the running position at which the handover is executed (step ST3).
4) A frequency switching signal for instructing switching of the radio frequency (transmission frequency and reception frequency) of the mobile station transceiver 34 is transmitted to the synthesizer 35 (step ST5).

That is, the mobile station internal memory 32 stores the travel positions corresponding to the plurality of handover points and the radio frequencies of the radio base stations corresponding to the plurality of handover points. It identifies which handover point has been reached, recognizes the radio frequency of the radio base station corresponding to the handover point, and transmits to the synthesizer 35 a frequency switching signal instructing switching to the radio frequency. For example, when performing a handover from the radio base station 27a to the radio base station 27b, the transmission frequency of the mobile station transceiver 34 is changed to the reception frequency f _B2 of the radio base station 27b, and the reception frequency of the mobile station transceiver 34 is changed to the radio frequency. A frequency switching signal indicating a change to the transmission frequency f _B1 of the base station 27b is transmitted to the synthesizer 35.

When receiving the frequency switching signal from mobile station CPU 33, synthesizer 35 changes the transmission frequency and the reception frequency of mobile station transceiver 34 according to the frequency switching signal, and executes handover (step ST).
6). Thereby, the mobile station terminal 24 and the central unit terminal 29
Can continuously execute wireless communication via the mobile station wireless device 23 and the wireless base station.

As is apparent from the above, the first embodiment
According to the above, when the traveling position of the train 22 measured by the position measuring device 31 matches the traveling position stored in the mobile station internal memory 32, the radio base station to be communicated is switched. Because it was configured to change the radio frequency to the next communication target radio frequency, without installing a ground child at all points where handover is performed,
As a result, the handover can be executed, and as a result, the facility cost and the maintenance cost can be significantly reduced, and the handover point can be easily changed.

Embodiment 2 FIG. 4 is a configuration diagram showing a detailed configuration of a mobile station radio in the train radio system according to Embodiment 2 of the present invention. In the figure, the same reference numerals as those in FIG. 3
Reference numeral 6 denotes a GPS wireless device (position measuring means) that receives GPS data from GPS satellites and detects the traveling position of the train.

Next, the operation will be described. In the first embodiment, the position measuring device 31 measures the running position of the train 22 based on the point at which the ground signal is received. However, the GPS radio 36 transmits the GPS signal from the GPS satellite to the GP.
The traveling position of the train 22 may be detected by receiving the S data.

As a result, the running position of the train 22 can be detected in real time, so that the upper armature 25 installed on the train 22 and the ground arm 26 installed along the track 21 become unnecessary, and furthermore, the equipment cost is reduced. And maintenance costs can be reduced.

Embodiment 3 FIG. In the first and second embodiments, the handover information is stored in the mobile station internal memory 3.
5, the handover information of the line segment actually traveled is stored in an external storage device (storage means) 37 such as an IC card, and an external memory is stored for each line segment traveled, as shown in FIG. The storage device 37 may be replaced. As a result, the capacity of the mobile station internal memory 32 can be reduced, so that there is an effect that facility costs and the like can be further reduced.

Embodiment 4 FIG. In the first and second embodiments, the case where the handover information is stored in advance in the mobile station internal memory 32 has been described. However, the mobile station operates at a specific time (for example, the time when the train 22 departs from the vehicle base). Then, handover information may be received from a specific wireless base station and the handover information may be stored in the mobile station internal memory 32.

Thus, even if the handover information stored in the mobile station internal memory 32 is lost during a power outage (for example, when the train 22 is delivered to the garage, the power is normally turned off), it can be specified. Since the handover information can be received from a specific wireless base station at the time, the effect that the RAM or the like can be used as the mobile station internal memory 32 is obtained.

Embodiment 5 FIG. FIG. 6 is a configuration diagram showing a detailed configuration of a mobile station radio and a radio base station in a train radio system according to Embodiment 5 of the present invention.
2 denote the same or corresponding parts, and a description thereof will not be repeated. Numeral 38 realizes the same function as the mobile station CPU 33 in FIG. 2 and also transmits position information indicating the running position of the train 22 measured by the position measuring device 31 to the mobile station transceiver 34.
, While receiving handover information from the currently communicating wireless base station, the mobile station CPU (frequency changing means) which stores the handover information in the mobile station internal memory 32. is there.

Reference numeral 39 denotes a base station internal memory (storage means) for storing handover information (running position at which handover is performed); 40, a base station transceiver of the radio base stations 27a, 27b, 27c; Receives the position information from the mobile station transceiver 34, grasps the running position of the train 22, and before the train 22 reaches the handover point, transmits the handover information stored in the base station internal memory 39 to the base station. It is a base station CPU that transmits to the mobile station radio 23 via the transceiver 40.

Next, the operation will be described. In the first and second embodiments, the case where handover information is stored in advance in the mobile station internal memory 32 has been described. However, before the train 22 reaches the handover point, the train 22 Handover information may be received.

That is, the mobile station CPU 38 controls the position measuring device 3
1 or the GPS radio 36 measures the running position of the train 22, as in the first and second embodiments,
The traveling position of the train 22 is compared with the handover information, and when the traveling position of the train 22 reaches the handover point, a frequency switching signal is transmitted to the synthesizer 35 to execute the handover, but the following points are different.

Since the handover information is not stored in the mobile station internal memory 32 in advance, the mobile station CPU 38
Means that the position measuring device 31 or the GPS radio 36
When the traveling position of the train 22 is measured, position information indicating the traveling position of the train 22 is transmitted to the currently communicating wireless base station via the mobile station transceiver 34 in order to acquire handover information.
Here, for convenience of explanation, it is assumed that the wireless base station 27a is a wireless base station that is currently communicating.

The base station CPU of the radio base station 27a
41, when the base station transceiver 40 receives the position information indicating the traveling position of the train 22 from the mobile station transceiver 34, it grasps the traveling position of the train 22, and before the train 22 reaches the handover point, The handover information stored in the station internal memory 39 is transmitted to the mobile station radio 23 via the base station transceiver 40. For example, when the distance from the running position of the train 22 to the handover point is less than 1 km, the base station transceiver 40 transmits the handover information to the mobile station radio 23.

Then, the mobile station CPU 38 determines that the mobile station transceiver 34 is the wireless base station 2 which is the wireless base station with which the mobile station is currently communicating.
When the handover information is received from 7a, the handover information is stored in the mobile station internal memory 32, and thereafter, the same processing as in the first and second embodiments is executed. However, when the handover is performed and the communication target is the radio base station 27b, this time, position information indicating the traveling position of the train 22 is transmitted to the radio base station 27b, and similarly,
Obtain handover information.

Thus, the same effects as those of the first and second embodiments can be obtained, and it is sufficient to store only the handover information relating to the next handover point. The effect which can reduce is produced.

Embodiment 6 FIG. In the fifth embodiment, the case where the handover information is stored in the base station internal memory 39 has been described. However, as shown in FIG.
2 and the external storage device 42 may be replaced for each running line section. As a result, the capacity of the base station internal memory 39 can be reduced, so that there is an effect that facility costs and the like can be further reduced.

[0044]

As described above, according to the present invention, when the running position of the train measured by the position measuring means exceeds the running position stored in the storing means, the radio base station to be communicated with is switched. Since the radio frequency of the mobile station is configured to be changed to the radio frequency of the next communication target, it is possible to execute the handover without installing ground terminals at all points where the handover is executed, As a result, it is possible to greatly reduce equipment costs and maintenance costs, and to easily change the handover point.

According to the present invention, when the ground child signal is received from the ground child, the running position of the train is measured with reference to the point where the ground child signal is received.
There is an effect that the running position of the train can be measured only by installing one ground child at an arbitrary point.

According to the present invention, the GPS satellite
Since the system is configured to receive the data and detect the running position of the train, the on-board child and the on-ground child are not required, and there is an effect that the facility cost and the maintenance cost can be reduced.

According to the present invention, since the storage means is constituted by using the external storage device, the capacity of the internal memory can be reduced, and as a result, the equipment cost and the like can be further reduced. There is an effect that can be.

According to the present invention, the running position at which the handover is performed is received from a specific radio base station at a specific time, so that the handover information stored in the storage means is lost when the power is turned off. However, since it is possible to receive handover information from a specific wireless base station at a specific time, there is an effect that a RAM or the like can be used as storage means.

According to the present invention, before the train reaches the travel position where the handover is performed, the travel position where the handover is performed is received from the currently communicating radio base station. There is an effect that the traveling position at which the handover is performed can be acquired without storing the traveling position to be executed in the storage unit.

According to the present invention, the traveling position of the train is compared with the traveling position at which the handover is performed, and when the traveling position of the train exceeds the traveling position at which the handover is performed, the radio base station to be communicated is switched. Since the radio frequency of the mobile station is configured to be changed to the radio frequency of the next communication target, the handover can be executed without installing a ground terminal at all points where the handover is executed. As a result, it is possible to greatly reduce equipment costs and maintenance costs, and to easily change the handover point.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a train radio system according to Embodiment 1 of the present invention.

FIG. 2 is a configuration diagram showing a detailed configuration of a mobile station radio in the train radio system according to the first embodiment of the present invention.

FIG. 3 is a flowchart showing a handover execution method according to the first embodiment of the present invention.

FIG. 4 is a configuration diagram showing a detailed configuration of a mobile station radio in a train radio system according to Embodiment 2 of the present invention.

FIG. 5 is a configuration diagram showing a detailed configuration of a mobile station radio in a train radio system according to Embodiment 3 of the present invention.

FIG. 6 is a configuration diagram showing a detailed configuration of a mobile station radio and a radio base station in a train radio system according to Embodiment 5 of the present invention.

FIG. 7 is a configuration diagram showing a detailed configuration of a mobile station radio and a radio base station in a train radio system according to Embodiment 6 of the present invention.

FIG. 8 is a configuration diagram showing a conventional train radio system.

FIG. 9 is a configuration diagram showing a detailed configuration of a mobile station radio.

[Explanation of symbols]

Reference Signs List 22 train, 23 mobile station radio (mobile station), 25 vehicle child (position measurement means), 26 ground child (position measurement means), 27a to 27c radio base station, 31 position measurement device (position measurement means), 32 Mobile station internal memory (storage means), 33, 38 mobile station CPU (frequency changing means),
35 synthesizer (frequency changing means), 36 GPS radio (position measuring means), 37, 42 external storage device (storage means), 39 base station internal memory (storage means).

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Makio Kawamoto 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation (72) Inventor Megumi Megumi 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Inside Ryo Denki Co., Ltd. (72) Inventor Teruo Kobayashi 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Yukiya Tateishi 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Inside Japan Railway Company (72) Inventor Yuji Omagari 2-2-2 Yoyogi, Shibuya-ku, Tokyo East Japan Railway Company (72) Inventor Hideaki Hayano 2-2-2 Yoyogi, Shibuya-ku, Tokyo No. Tohnichi Japan Railway Company (72) Inventor Yuichi Baba 2-2-2 Yoyogi Shibuya-ku Tokyo Remarks) 5H161 AA01 BB02 CC13 DD11 DD21 5K067 AA22 BB05 DD19 DD20 DD34 DD36 EE02 EE10 EE44 FF03 HH23 JJ35 JJ52 JJ56 JJ70 KK15

Claims (7)

[Claims] 1. A position measuring means for measuring a running position of a train, a storing means for storing a running position for executing a handover, and a running position of the train measured by the position measuring means is stored in the storing means. A train radio system comprising: a frequency changing unit that changes a radio frequency of a mobile station to a radio frequency of a next communication target in order to switch a radio base station to be communicated when the vehicle moves beyond a running position. 2. The position measuring means according to claim 1, wherein upon receiving a ground child signal from the ground child, the position measuring means measures a running position of the train based on a point at which the ground child signal is received. Train radio system. 3. The position measuring means is provided from a GPS satellite to a GPS.
2. The train radio system according to claim 1, wherein the data is received to detect a running position of the train. 4. The train radio system according to claim 1, wherein the storage unit is configured using an external storage device. 5. The mobile station according to claim 1, wherein at a specific time, the mobile station receives a travel position at which a handover is performed from a specific radio base station, and stores the travel position in a storage unit. Item 4. The train radio system according to any one of items 3. 6. The mobile station, before the train reaches the travel position where the handover is performed, receives the travel position where the handover is to be performed from the currently communicating radio base station, and stores the travel position in the storage unit. 2. The method according to claim 1, wherein
The train radio system according to any one of claims 1 to 3. 7. A running position of a train is measured, and a running position of the train is compared with a running position at which a handover is performed.
When the running position of the train exceeds the running position at which the handover is performed, to switch the wireless base station to be communicated,
A handover execution method for changing a radio frequency of a mobile station to a radio frequency of a next communication target.