JP2007082075A - Wireless communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make communication performance more efficient, e.g., in a train wireless communication system. <P>SOLUTION: There is provided a system which is equipped with a mobile station unit 2 that travels along a predetermined rail track, a plurality of base station units B1 to Bn provided along the rail track, and a control station unit 1 for managing the plurality of the base station units and allows the mobile station unit and the base station units to communicate wirelessly with each other and further performs handoff to each of the plurality of the base station units as the mobile station unit travels along the rail track. In the system, the mobile station unit transmits information for specifying the traveling direction of its own unit to the control station unit via the base station unit, while the control station unit receives the information transmitted from the mobile station unit via the base station unit to predict a base station unit for acting as a destination of the handoff of the mobile station unit based on the information received, thus controlling the handoff based on the result predicted. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a radio communication system such as a train radio communication system, and more particularly to a radio communication system designed to improve communication efficiency.

  For example, in a train radio communication system, a plurality of base station devices are installed at each position by arrangement along a track on which a train travels, and a slave station device that is a mobile station device is installed on the train. And the mobile station device of the train are communicated by radio. In this case, as the train progresses, the base station device that is the communication counterpart of the mobile station device of the train is sequentially switched, that is, handoff (handover) is performed.

As a handoff, the mobile station device side receives control signals transmitted by radio from several base station devices in use, and the base station device registered on its own side (mobile station device side) A base station apparatus is selected according to a search order, and a communication partner is switched to the selected base station apparatus.
However, in such a handoff configuration, it is not possible to select a base station device as a handoff destination, so in some cases, the mobile station device must move when receiving a control signal from the base station device. There may be a case where a signal from the base station apparatus cannot be detected and handoff is performed to another base station apparatus. In such a case, as a result, there arises a problem that the time required for normal handoff becomes long or the handoff is repeated carelessly.

Further, in the train radio communication system as described above, the control station device, which is the host system of the base station device, grasps the information on the location of the mobile station device via the dedicated control radio line, and when the mobile station device is connected, Calling a mobile station apparatus from only a necessary base station apparatus based on information has been performed.
However, in such a configuration of standing line position management, since a dedicated radio line is used for grasping the standing position of the mobile station apparatus, there is a problem that the effective utilization of the radio line is reduced accordingly. appear.

JP 2001-278049 A JP 2003-284131 A

As described above, in the train radio communication system as described above, there is still an inefficiency regarding radio communication between the base station apparatus and the train mobile station apparatus, and further efficiency has been desired. .
The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide a wireless communication system capable of improving communication efficiency.

In order to achieve the above object, in a wireless communication system according to the present invention, a mobile station apparatus that moves along a preset trajectory, a plurality of base station apparatuses provided along the trajectory, and the plurality of base stations A control station device for managing the device, wherein the mobile station device and the base station device communicate wirelessly, and handoff to each of the plurality of base station devices as the mobile station device moves along the orbit At this time, the following processing is performed.
That is, in the mobile station apparatus, the information transmitting means transmits information specifying the traveling direction of the own apparatus (the mobile station apparatus) to the control station apparatus via the base station apparatus.
In the control station apparatus, the information receiving means receives information transmitted from the mobile station apparatus via the base station apparatus. Further, the predicting means predicts a base station apparatus that is a handoff destination of the mobile station apparatus based on the information specifying the traveling direction of the mobile station apparatus received by the information receiving means. The control means controls handoff based on the prediction result by the prediction means.

  Therefore, information specifying the traveling direction of the mobile station apparatus is transmitted from the mobile station apparatus to the control station apparatus and is grasped by the control station apparatus, and the base station that is the handoff destination of the mobile station apparatus by the control station apparatus based on the information Since the device is predicted and handoff is controlled, for example, based on the traveling direction of the mobile station device, the base station device that is the handoff destination of the mobile station device is appropriately predicted to realize efficient handoff Can do.

Here, various configurations may be used as the configuration and number of mobile station devices, the configuration and number of base station devices, and the configuration and number of control station devices.
Further, the mobile station device and the base station device communicate with each other wirelessly, and the control station device and the base station device communicate with each other by wire or wirelessly.
In addition, the mobile station device is composed of, for example, a wireless communication device provided on a moving object such as a train, and moves with the movement of the train. In addition, it is also possible to consider a mobile station device by combining a moving function such as a train and a wireless communication function.

Moreover, various things may be used as a track | orbit which a mobile station apparatus moves, for example, a train track etc. can be used. In train tracks, there are usually two traveling directions (moving directions), one direction and the opposite direction. Further, as the trajectory, a trajectory having a branch may be used. Also, for example, when there are a plurality of tracks, information for identifying each track is provided, and when there is a branch in one track, information for identifying the track of each branch is provided. It is done.
In the mobile station apparatus, the traveling direction of the own apparatus may be set by a person, for example, or may be detected (automatically) by the apparatus.
In addition, each of the plurality of base station apparatuses is provided, for example, so that the distance between adjacent base station apparatuses along the trajectory is a predetermined level. The communication areas of the plurality of base station devices enable wireless communication with the mobile station device that moves along the entire orbit, and the mobile station device sequentially switches the base station device that is the communication partner according to the movement. Go (that is, hand off).

In addition, the control station device is connected to each base station device, for example, communication status between each base station device and the mobile station device, information such as the position of the mobile station device, and handoff of the mobile station device. Manage the situation.
In addition, various modes may be used as a mode of controlling handoff by the control station device. For example, the mode is predicted based on a prediction result of a base station device that is the next handoff destination of the mobile station device. A mode in which a preparatory process for performing handoff to the base station device is executed in advance, or a mode in which handoff to a device other than the predicted base station device is determined to be erroneous and not executed can be used.

The radio communication system according to the present invention has the following configuration as an example configuration.
That is, in one or both of the control station apparatus and the mobile station apparatus, the storage unit stores the correspondence between the traveling direction of the mobile station apparatus and the order of the base station apparatus serving as the handoff destination of the mobile station apparatus. And handoff is controlled based on the said correspondence memorize | stored in the said memory | storage means.
Therefore, for example, the order of the base station device that is the handoff destination of the mobile station device can be grasped from the traveling direction of the mobile station device, and the handoff can be appropriately controlled based on this.

Here, it is also possible to control handoff in the mobile station device, for example, executing preparatory processing for performing handoff to the base station device that is the next handoff destination in advance, or Based on this, handoff to a base station device other than the base station device predicted as the next handoff destination base station can be determined as an error and not executed.
Moreover, as a memory | storage means, it can comprise using a memory, for example.
As an example, for trajectories having two traveling directions, the order of base station apparatuses that are handoff destinations in the traveling direction in one direction and the order of base station apparatuses that are handoff destinations in the reverse direction are usually: The reverse order.

The radio communication system according to the present invention has the following configuration as an example configuration.
That is, in the mobile station apparatus, the information transmitting means further transmits information specifying the speed of the own apparatus (the mobile station apparatus) to the control station apparatus via the base station apparatus.
In the control station apparatus, the predicting unit is configured to determine the mobile station apparatus based on information identifying the traveling direction of the mobile station apparatus and information identifying the speed of the mobile station apparatus received by the information receiving unit. Predict position. Further, the control means determines a base station apparatus to be connected to the mobile station apparatus based on a prediction result by the prediction means.
Therefore, a position is predicted from the traveling direction and speed of the mobile station apparatus, and a base station apparatus that communicates with the mobile station apparatus based on the predicted position (in other words, a base station apparatus that does not communicate) is determined. Since the base station device and the mobile station device are connected to each other and wireless communication is performed, for example, depending on the position of the mobile station device, only the nearby base station device is connected for communication, and the system Overall, communication efficiency can be improved.

Here, in the mobile station apparatus, the speed of the own apparatus may be detected (automatically) by the apparatus, or may be set by a person, for example. As an example, in a mobile station device provided in a train, speed information detected by a speedometer of the train can be used as speed information of the own device.
Also, when predicting the position from the traveling direction and speed of the mobile station device, for example, information such as the position (consecutive position) and distance where the trajectory on which the mobile station device moves, the initial value of the mobile station device, etc. Information such as the position of the state (for example, the departure position of the departure station) or the position of the intermediate state (for example, the position of the middle of the station, etc.) and the time is set by a person or by the device (automatically) It may be set and referenced.

The radio communication system according to the present invention has the following configuration as an example configuration.
That is, in the control station apparatus, when the mobile station apparatus moves from a communication area of one base station apparatus to a communication area of another base station apparatus, the position of the mobile station apparatus and the other A signal from the other base station apparatus to the mobile station apparatus is wirelessly transmitted when the separation distance from the position of the base station apparatus is less than or less than a preset threshold value.
Therefore, for example, in a situation where the mobile station device exists in the communication area of one base station device and is in communication connection with the one base station device and performing wireless communication, another base station device that is the next handoff destination When the mobile station device approaches or enters the communication area of the mobile station device before the mobile station device approaches the other base station device based on a predetermined threshold value, the mobile station device is transferred from the other base station device to the mobile station device. Start wireless transmission of signals from the other base station device to the mobile station device when the mobile station device approaches the other base station device based on a predetermined threshold without wirelessly transmitting the signal. As a result, the efficiency of wireless communication during handoff can be improved.

Here, the control station apparatus includes, for example, means for storing or detecting position information of each base station apparatus.
Further, when obtaining the separation distance between the position of the mobile station apparatus and the position of the base station apparatus, the position of the base station apparatus does not necessarily need to be the position where the base station apparatus actually exists. From the viewpoint of efficiently performing handoff of the mobile station device from the communication area of one base station device to the communication area of another base station device, an arbitrary position may be set and used as the position of each base station device .
In addition, various values may be used as the threshold regarding the separation distance between the position of the mobile station apparatus and the position of the base station apparatus. For example, from the base station apparatus serving as a handoff destination to the mobile station apparatus serving as a handoff target It is preferable to use a value that is wirelessly transmitted only when the above signal is required.

  As another configuration example, when a mobile station apparatus moves from a communication area of one base station apparatus to a communication area of another base station apparatus, a positional relationship between the mobile station apparatus and the other base station apparatus is detected. Use a configuration that starts wirelessly transmitting a signal from the other base station device to the mobile station device in response to the detected positional relationship meeting a predetermined condition. Is also possible. As the predetermined condition, for example, the positional relationship between the mobile station apparatus and the base station apparatus that is the handoff destination is preferably a position where wireless transmission of a signal from the base station apparatus to the mobile station apparatus is started. Conditions that are considered to be related can be used.

The radio communication system according to the present invention has the following configuration as an example configuration.
That is, in the mobile station apparatus, the information transmitting means uses a wireless line provided for communication of call information with the base station apparatus, and sends information to the base station apparatus. Wireless transmission.
Therefore, for example, a radio channel (communication channel) for communication of communication information is used instead of a radio channel (control channel) for communication of control information, so that the traveling direction information and speed information of the mobile station apparatus are used. Is wirelessly communicated, the control channel can be eliminated, and the wireless line can be used effectively.

  As described above, according to the radio communication system according to the present invention, in a configuration including a mobile station device, a plurality of base station devices, and a control station device, different bases move as the mobile station device moves along a track. When handing off to the station apparatus, for example, the control station apparatus manages information on the traveling direction of the mobile station apparatus, information on the speed, and the like, so that communication efficiency can be improved.

Embodiments according to the present invention will be described with reference to the drawings.
FIG. 1 shows a configuration example of a train radio communication system according to an embodiment of the present invention. In the train radio communication system according to the present embodiment, for example, MCA (Multi-Channel Access) radio communication is used.
The train radio communication system according to the present embodiment includes a control station device 1, a plurality of base station devices B1 to Bn connected to the control station device 1, and a mobile station device 2 installed on the train. Is provided.
Here, the mobile station apparatus 2 moves as the train on which it is installed moves.
In addition, the plurality of base station apparatuses B1 to Bn are arranged at a distance interval along the track on which the train travels, for example, wireless communication with the mobile station device 2 of the train traveling on the track. Is installed near the track to the extent possible.
Moreover, the mobile station apparatus 2 is provided for each train.
Further, for example, a plurality of control station devices 1 may be provided.

The control station apparatus 1 includes a moving local line position storage unit 11 that stores information on the existing line position of the mobile station apparatus 2, a plurality of n base station connection units A1 to An, and a control unit 12 that performs various controls. It has. Each base station connection unit A1 to An is connected to each base station apparatus B1 to Bn via, for example, a wired line or a wireless line, and functions as an interface.
The mobile station apparatus 2 includes an antenna 21 that transmits and receives radio signals, a radio device 22 that performs radio communication processing, a control unit 23 that performs communication control, and mobile station information control that controls information related to the mobile station apparatus 2. The unit 24 is provided.
The mobile station apparatus 2 moves on the line around the plurality of base station apparatuses A1 to An arranged on the line, and transmits / receives individual information to / from the base station apparatuses A1 to An using a radio line. .

In the train radio communication system according to the present embodiment, the information transmission means is configured by the function of the processing units 21 to 24 of the mobile station device 2 transmitting information, and the processing units 12 and A1 to A1 of the control station device 1 are configured. The information receiving means is configured by the function of receiving information by An, and the prediction means is configured by the function in which the processing units 11 and 12 of the control station apparatus 1 perform prediction related to handoff of the mobile station apparatus 2 and the like. The control unit of the control station apparatus 1 is configured by the function that the processing units 11 and 12 of the station apparatus 1 control and execute the processing related to handoff.
Further, in the train radio communication system according to the present embodiment, the storage unit of the mobile station apparatus 2 is configured by the function that the processing unit 24 of the mobile station apparatus 2 stores the registration contents as shown in FIG. The storage unit of the control station device 1 is configured by the function of the processing unit 11 of the control station device 1 storing the registration contents in the memory as shown in FIG. 3, and the processing units 23 and 24 of the mobile station device 2 are The control means of the mobile station apparatus 2 is configured by a function that controls and executes processing related to handoff.

A first embodiment of the present invention will be described.
In the internal memory of the mobile station apparatus 2 of this example, information that can be used to determine in which direction the mobile station apparatus 2 is traveling, and base station apparatuses B1 to B1 that may be handed off Information of Bn is stored. This memory is provided in the mobile station information control unit 24, for example.
In addition, information on base station apparatuses B1 to Bn that the mobile station apparatus 2 may hand off is stored in the internal memory of the control station apparatus 1 that is the host system. This memory is provided, for example, in the moving local line position storage unit 11. As a result, the base station devices B1 to Bn that are handoff candidates based on the information on the direction in the orbit transmitted from the mobile station device 2 and the information of the base station devices B1 to Bn where the mobile station device 2 is currently located are sent. It is possible to choose one.

With reference to FIG. 2, a specific example of the handoff method of this example is shown.
FIG. 2 shows a control station apparatus 1, a mobile station apparatus 2, three base station apparatuses (base station apparatuses 1, 2, 3) B1, B2, B3, and a trajectory C on which the mobile station apparatus 2 moves. It is shown. Moreover, distribution of the communication areas D1-D3 of each base station apparatus B1-B3 is shown. Note that, for example, base station apparatuses with overlapping communication areas such as the base station apparatus B1 and the base station apparatus B2, for example, wireless communication using carriers of different frequencies is performed or the same in such a manner that they do not interfere with each other. May be used.
FIG. 3 shows an example of information that is registered and stored in the memory of the mobile station apparatus 2 and the memory of the control station apparatus 1 that is the host system.
In this example, traveling direction information, base station apparatus information, and remarks information are registered in association with each other.

For a certain direction, the traveling direction information “1 → 3” indicates the traveling direction of the mobile station apparatus 2, and the corresponding base station apparatus information “1, 2, 3,...” Is the traveling direction information. Are handed off in the order of base station apparatus B1 (base station apparatus 1), base station apparatus B2 (base station apparatus 2), base station apparatus B3 (base station apparatus 3),. The communication partner is switched).
Regarding the reverse direction, the traveling direction information “3 → 1” represents the traveling direction of the mobile station apparatus 2, and the corresponding base station apparatus information “3, 2, 1,... Are handed off in the order of base station apparatus B3 (base station apparatus 3), base station apparatus B2 (base station apparatus 2), base station apparatus B1 (base station apparatus 1) (that is, communication of mobile station apparatus 2) This means that the other party is switched).

  As an example, when the moving mobile station apparatus 2 is moving from the communication area D1 of the base station apparatus B1 toward the communication area D3 of the base station apparatus B3, the mobile station apparatus 2 does not move like this. The traveling direction information indicating the direction (in this example, “1 → 3”) is wirelessly transmitted to the base station apparatus B1, and the traveling direction information is transmitted to the control station apparatus 1 via the base station apparatus B1. The base station apparatus B1 that has received the traveling direction information transmits the traveling direction information to the control station apparatus 1, and the control station apparatus 1 sets and registers the traveling direction information. In addition, the control station apparatus 1 stores the location information of the mobile station apparatus 2 that the mobile station apparatus 2 currently exists in the communication area D1 of the base station apparatus B1. The mobile station device 2 also stores travel direction information indicating the current travel direction of the device 2.

When the mobile station apparatus 2 moves from the communication area D1 of the base station apparatus B1 to the communication area of the base station apparatus B2, the next base station apparatus (here, the base station apparatus) registered in advance in the own apparatus 2 Select B2). That is, base station apparatus B2 is selected as the handoff destination.
Further, in the control station device 1 which is the host system, when the mobile station device 2 is handed off, the control station device 1 predicts in advance based on the traveling direction information already notified from the mobile station device 2 and the registered contents shown in FIG. A channel of the handoff destination base station apparatus (in this case, base station apparatus B2) is allocated.

  Similarly, when the mobile station apparatus 2 moves from the communication area D2 of the base station apparatus B2 to the communication area D3 of the base station apparatus B3, the mobile station apparatus 2 also performs base station based on the registration contents shown in FIG. The station device B3 is recognized as a handoff destination, and the control station device 1 also recognizes the base station device B3 as a handoff destination of the mobile station device 2 based on the registration contents shown in FIG.

In this way, the mobile station apparatus 2 and the control station apparatus 1 that is the host system share information of the base station apparatuses B1 to Bn that are predicted handoff destinations in advance, thereby eliminating misrecognition of handoff. Can do.
Further, in the mobile station apparatus 2 and the control station apparatus 1 which is a host system, by selecting a handoff destination, a smooth handoff is possible, and the handoff time is shortened.

As described above, in the train radio communication system of this example, the mobile station device 2 of the train notifies the control station device 1 that is the host system of information on the travel direction of the mobile station device 2 (the travel direction of the train). The control station apparatus 1 manages and grasps the traveling direction information, and prepares the next base station apparatus predicted based on the traveling direction information and the registered contents shown in FIG. 3 as a handoff destination.
Specifically, information indicating the traveling direction is stored in advance in a memory table by the mobile station device 2 traveling on a predetermined track C, and this information is sent to the control station device 1 which is a host system. Then, the control station apparatus 1 receives this information and stores it on the memory table, and predicts to which base station apparatus the traveling mobile station apparatus 2 will next handoff. Also in the mobile station apparatus 2, the base station apparatus to be handed off next is predicted in advance based on the information stored on the memory table.

  Therefore, in the train radio communication system of this example, the mobile station device 2 or the control station device 1 can select a handoff candidate base station device, and the handoff can be performed smoothly, resulting in the time required for the handoff. Can be shortened. Moreover, the handoff sequence of the mobile station apparatus 2 can be predicted in advance by the control station apparatus 1 which is a host system, and selected as an arbitrary one, thereby stabilizing the handoff sequence. In addition, by stabilizing the handoff sequence, it is possible to prevent the call from being disconnected during the handoff or to shorten the time for disconnecting the call.

A second embodiment of the present invention will be described.
Each base station apparatus B1 to Bn always wirelessly transmits individual information to the mobile station apparatus 2. Based on the received individual information from the base station apparatuses B1 to Bn, the mobile station apparatus 2 grasps which base station apparatus B1 to Bn is present at a position where it can communicate.
In the mobile station device 2 of this example, the mobile station information control unit 24 acquires train number information, traveling direction information, and speed information at predetermined time intervals. Further, the mobile station information control unit 24 moves from a new base station device (for example, a base station device different from the base station device that has been communicating so far) by moving the mobile station device 2 between the base station devices. When the individual information is received, the mobile station individual information consisting of train number information, traveling direction information and speed information is sent to the new base station device to the new base station device using an empty communication radio channel (communication channel). Is added to this information and transmitted wirelessly. Thereby, every time the mobile station information control unit 24 receives the individual information from the new base station apparatus, the mobile station information control unit 24 sends the mobile station individual information to the new base station apparatus. The new base station apparatus relays and transmits the mobile station individual information received from the mobile station apparatus 2 to the control station apparatus 1.

Here, as the train number information, for example, unique number information is set for each train. For example, the mobile station information control unit 24 obtains the number information by accessing an apparatus constituting the train, or the number information may be stored in a memory such as the mobile station information control unit 24. In this example, the train number information is used as identification information of the mobile station device 2.
The traveling direction information is set by a person such as a train driver or automatically detected by the apparatus. For example, the mobile station information control unit 24 obtains the traveling direction information by accessing an apparatus constituting the train, or the traveling direction information may be stored in a memory such as the mobile station information control unit 24.

Moreover, as speed information, it detects by the train or the mobile station apparatus 2, for example. For example, the mobile station information control unit 24 may access a device constituting the train to acquire the speed information, or the speed information may be acquired by the mobile station information control unit 24 or the like.
The speed includes, for example, not only the case where the mobile station device 2 is moving (the train is moving) but also the case where the mobile station device 2 is stopped (the train is stopped). That is, the case where the speed is zero is also included.
Further, as another configuration example, information on a trajectory (station) on which each train (each mobile station device 2) specified by each train number information moves, information on a train timetable having time information, and the like are included in the control station device. It is also possible to use a configuration stored in a memory such as 1 and referred to.

  In the control station apparatus 1 of this example, the mobile local line position storage unit 11 corresponds to the plurality of base station apparatuses B1 to Bn, and the mobile station apparatus 2 that is transmitted via the base station apparatuses B1 to Bn. Identification information (in this example, train number information), traveling direction information, and speed information are stored in a memory for a certain period of time. Based on the traveling direction information and the speed information, the mobile station apparatus 2 is updated by the base station apparatus over time. Position information such as which line is present is calculated and stored. For example, the mobile localized line position storage unit 11 stores the mobile station individual information transmitted from the mobile station apparatus 2 via the new base station apparatus in association with the new base station apparatus for a certain period of time, The on-line position of the mobile station device 2 is calculated and stored every predetermined time. The control station apparatus 1 stores information for each mobile station apparatus 2 existing in the radio service areas (communication areas) of the base station apparatuses B1 to Bn for a certain period of time, so that each mobile station apparatus 2 is in any position ( For example, it is identified which of the base station apparatuses is located under the position of the base station apparatus and more detailed position.

With reference to FIGS. 4A and 4B, a specific example of the connection method of the mobile station apparatus 2 of this example will be shown.
4A and 4B, the control station apparatus 1, the plurality of base station apparatuses B1 to Bn, and the mobile station apparatus 2 (moving along the arrangement order of the plurality of base station apparatuses B1 to Bn ( Mobile station devices 2a, 2b) are shown. Here, the mobile station apparatus 2a and the mobile station apparatus 2b represent the same mobile station apparatus 2, and the mobile station apparatus 2a is shown at a position before the movement of the mobile station apparatus 2, and the mobile station apparatus 2b is moved. It is shown in the position after the movement of the station apparatus 2.

First, when the mobile station apparatus 2 moves from the communication area of the base station apparatus B1 to the communication area of the base station apparatus B2, the train number information, traveling direction information, and speed of the mobile station apparatus 2 are transmitted to the control station apparatus 1. Send individual information such as information.
Based on the individual information received from the mobile station device 2, the control station device 1 calculates and stores the existing line position of the mobile station device 2 for each predetermined time. For example, the mobile station device 2 is specified by train number information, the traveling direction of the mobile station device 2 is specified by traveling direction information, the speed of the mobile station device 2 is specified by speed information, and the mobile station device is determined from the traveling direction and speed. The position on the line where 2 exists (the existing line position) is specified. The initial position information of the mobile station apparatus 2 is notified from the mobile station apparatus 2 to the control station apparatus 1 at the initial position, or the initial position information is stored in the memory of the control station apparatus 1 in advance. Is set.

FIG. 4 (a) shows a case where the mobile station apparatus 2b is moving to the communication area of the base station apparatus B2 and is located near the front half of the base station apparatus B2.
In this case, at the time of communication connection from the control station apparatus 1 to the mobile station apparatus 2, the existing line position of the mobile station apparatus 2 calculated by the control station apparatus 1 in the traveling direction is determined based on the information for each mobile station apparatus 2 stored for a certain period of time. On the other hand, it is determined that the line is located in the vicinity of the first half of the base station apparatus B2, and in response to this, the control station apparatus 1 wirelessly transmits information from only the base station apparatus B2 to the mobile station apparatus 2 so that the mobile station apparatus 2 is connected.

FIG. 4B shows a case where the mobile station device 2b is moving to the communication area of the base station device B2 and is located near the far second half of the base station device B2.
In this case, at the time of communication connection from the control station apparatus 1 to the mobile station apparatus 2, the existing line position of the mobile station apparatus 2 calculated by the control station apparatus 1 is located near the far second half of the base station apparatus B2 with respect to the traveling direction. In response to this, the control station apparatus 1 wirelessly transmits information to the mobile station apparatus 2 from both the original base station apparatus B2 and the next base station apparatus B3 in the traveling direction, and the mobile station apparatus 2 is connected.

As described above, in the train radio communication system of the present example, the mobile station device 2 of the train notifies the control station device 1 that is a host system of information on the traveling direction of the mobile station device 2 (the traveling direction of the train). Then, the control station apparatus 1 manages and grasps the traveling direction information and prepares the next base station apparatus predicted based on the traveling direction information as a handoff destination.
For example, when there are a plurality of mobile station apparatuses 2 (a plurality of trains) in the communication area of any base station apparatus B1 to Bn, the traveling direction and the moving speed (including stopping) of each mobile station apparatus 2 are indicated. Management is performed in advance, and communication between the base station devices B1 to Bn and each mobile station device 2 is performed by a communication channel (directly without using a control channel) in a predetermined time zone based on management information. Is called.
Further, for example, when there are a plurality of mobile station apparatuses 2 (a plurality of trains) in the communication area of any base station apparatus B1 to Bn, the traveling direction and the moving speed (including stopping) of each mobile station apparatus 2 ), It is possible to determine and manage whether or not to perform wireless communication connection between the base station devices B1 to Bn and each mobile station device 2.

Therefore, in the train radio communication system of this example, the control station apparatus 1 eliminates the control-dedicated radio line by detecting and grasping the existing line position of the mobile station apparatus 2 without using the control-dedicated radio line. It is possible to improve the effective utilization of the wireless line.
Further, in the train radio communication system of this example, the mobile station device 2 uses a free call radio channel to send information such as the traveling direction and speed to the control station device 1 via the base station devices B1 to Bn. Based on this, the control station apparatus 1 calculates and stores the existing line position of the mobile station apparatus 2 and is necessary when connecting the mobile station apparatus 2 from the control station apparatus 1 to the base station apparatuses B1 to B1. By transmitting a signal from only Bn to the mobile station apparatus 2, it is possible to eliminate the control radio channel and to effectively use the radio channel.

Here, the configurations of the wireless communication system and each device according to the present invention are not necessarily limited to those described above, and various configurations may be used. The present invention can also be provided as, for example, a method or method for executing the processing according to the present invention, a program for realizing such a method or method, or a recording medium for recording the program. It is also possible to provide various devices and systems.
The application field of the present invention is not necessarily limited to the above-described fields, and the present invention can be applied to various fields.
In addition, as various processes performed in the wireless communication system and each device according to the present invention, for example, a processor executes a control program stored in a ROM (Read Only Memory) in hardware resources including a processor and a memory. The configuration controlled by doing so may be used, and for example, each functional means for executing the processing may be configured as an independent hardware circuit.
The present invention can also be understood as a computer-readable recording medium such as a floppy (registered trademark) disk or a CD (Compact Disc) -ROM storing the control program, and the program (itself). The processing according to the present invention can be performed by inputting the program from the recording medium to the computer and causing the processor to execute the program.

It is a figure which shows the structural example of the train radio | wireless communications system which concerns on the Example of this invention. It is a figure for demonstrating an example of the handoff system which concerns on 1st Example of this invention. It is a figure which shows an example of the registration content of the mobile station apparatus and higher-order system (control station apparatus) which concern on 1st Example of this invention. (A) And (b) is a figure for demonstrating an example of the connection system of the mobile station apparatus which concerns on 2nd Example of this invention.

Explanation of symbols

  1 .. Control station device 2, 2a, 2b... Mobile station device 11... Moving local line position storage unit 12, 23... Control unit 21.. Antenna 22.. Radio unit 24. Mobile station information control unit, A1 to An, base station connection unit, B1 to Bn, base station device, C, orbit, D1 to D3, communication area,

Claims (5)

A mobile station device that moves along a predetermined trajectory; a plurality of base station devices provided along the trajectory; and a control station device that manages the plurality of base station devices, the mobile station device and the In a wireless communication system in which a base station device communicates wirelessly and the mobile station device moves off along the trajectory, and hands off to each of the plurality of base station devices.
The mobile station apparatus includes information transmission means for transmitting information specifying the traveling direction of the own apparatus to the control station apparatus via the base station apparatus,
The control station apparatus includes information receiving means for receiving information transmitted from the mobile station apparatus via the base station apparatus, and information for specifying a traveling direction of the mobile station apparatus received by the information receiving means. A prediction unit that predicts a base station device that is a handoff destination of the mobile station device based on a control unit that controls handoff based on a prediction result by the prediction unit;
A wireless communication system. The wireless communication system according to claim 1, wherein
One or both of the control station apparatus and the mobile station apparatus includes storage means for storing a correspondence between a traveling direction of the mobile station apparatus and an order of base station apparatuses that are handoff destinations of the mobile station apparatus, Controlling handoff based on the correspondence stored in the means;
A wireless communication system. The wireless communication system according to claim 1 or 2,
In the mobile station apparatus, the information transmitting means further transmits information specifying the speed of the own apparatus to the control station apparatus via the base station apparatus,
In the control station apparatus, the predicting unit is configured to determine the position of the mobile station apparatus based on information specifying the traveling direction of the mobile station apparatus and information specifying the speed of the mobile station apparatus received by the information receiving unit. Predict
The control means determines a base station apparatus to be connected to the mobile station apparatus based on a prediction result by the prediction means.
A wireless communication system. The wireless communication system according to claim 3,
In the control station apparatus, when the mobile station apparatus moves from a communication area of one base station apparatus to a communication area of another base station apparatus, the control means determines the position of the mobile station apparatus and the other base station. In response to the separation distance from the position of the device being less than or less than a preset threshold, starting to wirelessly transmit a signal from the other base station device to the mobile station device,
A wireless communication system. The wireless communication system according to any one of claims 1 to 4,
In the mobile station apparatus, the information transmitting means wirelessly transmits information to the base station apparatus using a wireless channel provided for communication of call information with the base station apparatus. ,
A wireless communication system.

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