JP7195975B2 - Wireless communication system and base station - Google Patents

Description

The present invention relates to a radio communication system comprising a base station and a plurality of mobile stations, and more particularly to a radio communication system, base station and mobile station that can reduce current consumption in mobile stations and effectively utilize radio resources.

[Conventional technology]
Conventionally, there has been a radio communication system composed of a base station and a plurality of mobile stations.
[Conventional wireless communication system: Fig. 6]
A conventional wireless communication system will be described with reference to FIG. FIG. 6 is a diagram for explaining polling responses in a conventional wireless communication system.
As shown in FIG. 6, a conventional wireless communication system includes an operation management device 1, a base station 2, and a plurality of mobile stations 3,4.

Although one base station 2 is connected to the operation management device 1 in FIG. 6, a plurality of base stations are normally connected. Also, although two mobile stations are illustrated, three or more mobile stations may be wirelessly connected to the base station 2 .

The mobile stations 3 and 4 also control GPS (Global Positioning System) modules, receive GPS positioning information from GPS satellites, and acquire position information and time information.
Further, the mobile stations 3 and 4 receive a polling response request from the base station 2 and make a polling response of position information.

[Conventional mobile station processing: FIG. 7]
Next, the processing of the conventional mobile station will be described with reference to FIG. FIG. 7 is a diagram showing processing of a conventional mobile station.
As shown in FIG. 7, the mobile stations 3 and 4 start processing (S31), receive GPS positioning data (S32), and store the GPS positioning data internally (S33).

[Conventional base station processing: FIG. 8]
Next, processing of a conventional base station will be described with reference to FIG. FIG. 8 is a diagram showing processing of a conventional base station.
As shown in FIG. 8, the base station 2 starts processing (S41), issues a polling request to the mobile station 3 (S42), and receives GPS positioning data (location information) from the mobile station 3 ( S43).
Next, the base station 2 issues a polling request to the mobile station 4 (S44), receives the location information from the mobile station 4 (S45), and repeats the above process.

[Related technology]
As a related prior art, there is Japanese Unexamined Patent Application Publication No. 2004-080584 entitled "Portable Information Terminal" (Patent Document 1).
Patent Document 1 discloses that a portable information terminal determines whether it is moving or not moving, and if it determines that it is not moving, it stops communicating with a base station or extends the communication interval. .

JP 2004-080584 A

However, in the conventional wireless communication system, the mobile station responds with location information in response to a polling response request from the base station. There is a problem that the operable time of the station is shortened, and furthermore, since the base station issues a polling response request to all mobile stations within the area, the radio resource occupation time is lengthened.

Although Patent Document 1 describes reducing the battery consumption of a portable information terminal, it does not describe a configuration for effectively utilizing radio resources by shortening the time occupied by communication in a base station.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless communication system, a base station, and a mobile station that can reduce current consumption in mobile stations and effectively utilize wireless resources.

The present invention, which solves the problems of the conventional example, is a radio communication system in which a base station and a mobile station communicate by radio. When the base station receives the function-off information from the mobile station, the frequency of polling response requests to the mobile station is reduced from the initial state, and the mobile station moves. If the outage continues, the frequency of polling response requests to the mobile station is further reduced .

In the above wireless communication system, when the mobile station is in motion, the mobile station turns on the function of receiving GPS positioning information and transmits information indicating that the function is on to the base station. is received, the frequency of polling response requests to the mobile station is returned to the initial state.

According to the present invention, the above wireless communication system has an operation management device that is connected to the base station and performs operation management. It is characterized by displaying information during or during suspension.

The present invention is a base station that performs wireless communication with a mobile station, and upon receiving information for turning off a function of receiving GPS positioning information from the mobile station, changes the frequency of polling response requests to the mobile station from the initial state to If the mobile station continues to stop moving, the frequency of polling response requests to the mobile station is further reduced .

The present invention is characterized in that when the base station receives information for turning on the function of receiving GPS positioning information from the mobile station, the frequency of polling response requests to the mobile station is returned to the initial state.

According to the present invention, there is provided a wireless communication system for wirelessly communicating between a base station and a mobile station, wherein when the mobile station stops moving, the function of receiving GPS positioning information is turned off and the base station turns off the function. When the base station receives the function off information from the mobile station, it reduces the frequency of polling response requests to the mobile station, and when the mobile station continues to stop moving, it sends a polling response to the mobile station. Since the radio communication system further reduces the frequency of requests, it is possible to reduce current consumption in the mobile station, shorten the time occupied by communication in the base station, and effectively utilize radio resources.

According to the present invention, when a mobile station is in motion, it turns on the function of receiving GPS positioning information, transmits the function-on information to the base station, and the base station receives the function-on information from the mobile station. Then, since the above wireless communication system restores the frequency of polling response requests to the mobile station, there is an effect that the movement of the mobile station can be appropriately managed.

It is a figure explaining operation|movement of the mobile station of this system. It is a figure explaining the polling response of this system. FIG. 4 is a flow diagram showing processing in a mobile station; FIG. 10 is a flow diagram showing processing 1 of the base station; FIG. 10 is a flow diagram showing processing 2 of the base station; FIG. 2 is a diagram for explaining polling responses in a conventional wireless communication system; FIG. 2 is a diagram showing processing of a conventional mobile station; FIG. 2 is a diagram showing processing of a conventional base station;

An embodiment of the present invention will be described with reference to the drawings.
[Outline of Embodiment]
In the wireless communication system (this system) according to the embodiment of the present invention, when a mobile station acquires speed information from GPS positioning information and determines to stop moving based on the speed information, it turns off the reception function of the GPS module. , the OFF information, location information, and time information are transmitted to the base station, and the base station uses the OFF information to reduce the frequency of polling response requests to the mobile station. It shortens the time occupied by communication in the station and effectively utilizes radio resources.

In addition, when the mobile station determines movement with the acceleration sensor, this system turns on the reception function of the GPS module to resume receiving GPS positioning information, and the base station responds to the polling response request with the mobile station's location information. movement of the mobile station is recognized and the frequency of polling response requests to the base station is returned to the normal interval, so that the movement of the mobile station can be properly managed.

[Operation of the mobile station of this system: Fig. 1]
The operation of the mobile station in this system will be explained with reference to FIG. FIG. 1 is a diagram for explaining the operation of a mobile station in this system.
Before explaining the configuration of this system, the operation of the mobile station will be explained.
As shown in FIG. 1, mobile stations 3 and 4 receive GPS positioning information (GPS positioning data) from GPS satellites 5 at intervals of 1 second by using GPS modules. Of course, the mobile stations 3, 4 are equipped with radio modules for wireless communication with the base station.

In addition, the mobile stations 3 and 4 acquire position information and time information from the received GPS positioning data using a GPS module, and further calculate speed information.
Furthermore, the mobile stations 3 and 4 are equipped with acceleration sensors so that they can determine movement.

Here, when the mobile station 4 is determined to be moving based on the speed information obtained from the GPS positioning data, it keeps the reception function of the GPS module turned on.
In addition, if the speed information obtained from the GPS positioning data is, for example, five consecutive times of 1 km/h or less, the mobile station 3 determines that the mobile station 3 is stopped, turns off the reception function of the GPS module, and sends the base station 2 The off information, position information, and time information are transmitted, and the movement determination of the acceleration sensor is started.

If the mobile station 3 determines that it is moving again as determined by the acceleration sensor, the mobile station 3 turns on the reception function of the GPS module and receives GPS positioning data from the GPS satellites 5 .
In this way, the mobile station reduces the current consumption of the battery pack.

[Polling response of this system: Fig. 2]
Next, the polling response of this system will be described with reference to FIG. FIG. 2 is a diagram for explaining the polling response of this system.
As shown in FIG. 2, this system includes an operation management device 1, a base station 2, and a plurality of mobile stations 3 and 4.
A base station 2 is connected to an operation management device 1 by wire, and wireless communication is performed between the base station 2 and mobile stations 3 and 4 . Mobile stations 3 and 4 receive GPS positioning information (GPS positioning data) from GPS satellites 5 .

Although one base station 2 is connected to the operation management device 1 in FIG. 2, a plurality of base stations 2 may be connected.
Although two mobile stations 3 and 4 are wirelessly connected to the base station 2, more mobile stations may be wirelessly connected.
A monitor 1a is connected to the operation management device 1 to display the positional information of the mobile station on the map. A specific display will be described later.

As for polling responses in this system, as shown in FIG. 2, if mobile stations 3 and 4 are both moving, base station 2 transmits polling response requests at regular intervals, and mobile stations 3 and 4 poll. Position information and time information are received as a response, and the position information and time information of the mobile station are transmitted to the operation management device 1 .
The mobile stations 3 and 4 determine that they are moving when the speed information calculated from the GPS positioning data exceeds a specific numerical value (for example, 1 km/h), and when the speed is below the specific numerical value. Determined as stopped.

When it is determined that the mobile station 3 is stopped based on the speed information calculated from the GPS positioning data, the GPS module reception function is turned off, and the base station 2 transmits the GPS module reception function off information, position information, and the like. Send time information. This transmission to the base station 2 may be made immediately after the reception function of the GPS module is turned off, or may be made as a polling response to a polling response request.

When the base station 2 receives information indicating that the reception function of the GPS module is off from the mobile station 3 , the base station 2 transmits the off information, the location information of the mobile station, and the time information to the operation management apparatus 1 .
Also, the base station 2 reduces the frequency of polling response requests to the mobile station 3 that has received the information that the reception function of the GPS module is turned off, for example, to ⅕. In other words, the polling response request is sent to the moving mobile station 4 at the normal frequency, and to the stationary mobile station 3, polling is performed at a lower frequency of 1/5 (5 times as long as the interval). Send a response request.

When the mobile station 3 determines that it is moving based on the built-in acceleration sensor, it turns on the reception function of the GPS module and resumes receiving GPS positioning data from the GPS satellites 5 .
Then, the mobile station 3 transmits information indicating that the reception function of the GPS module is on, location information, and time information in response to the next polling response request.
That is, when the reception function of the GPS module is on, the mobile station 3 calculates the speed information based on the GPS positioning data to determine whether the mobile station 3 is stopped. is used to determine whether it is moving.

When the base station 2 receives information indicating that the reception function of the GPS module is turned on, location information, and time information from the mobile station 3, the base station 2 transmits the information to the operation management device 1, and then polls the mobile station 3 at a normal frequency. Send a response request. In other words, the frequency of polling response requests that has been reduced while the mobile station is stopped is restored (initialized) to the original frequency of polling response requests since it is now moving.

[Processing at the mobile station: Fig. 3]
Next, the GPS module control processing at the mobile station in this system will be described with reference to FIG. FIG. 3 is a flow diagram showing processing at the mobile station.
As shown in FIG. 3, when the process starts (S1), the mobile station receives GPS positioning data from the GPS satellites 5 (S2) and stores (saves) the positioning data internally (S3).

Then, the mobile station determines whether or not the speed information calculated from the positioning data is 1 km/h or less five times consecutively (five times of receiving the positioning data) (S4). Instead of determining whether or not the speed is 1 km/h or less five times in succession, it may be determined whether or not the distance traveled by the mobile station within a specific period is within a specific distance.

If the speed is not 1 km/h or less (No), it is determined that the mobile station is moving, and the process returns to step S2.
If the speed is 1 km/h or less (Yes), it is determined that the mobile station is stopped. Transmits off information, location information and time information.

Then, the mobile station performs movement determination using the acceleration sensor (S6).
Movement is determined by the acceleration sensor when acceleration is applied in a certain direction for a certain period of time and when the acceleration exceeds a specific threshold value, the movement is determined.

In determination processing S6, if it is not movement (in the case of No), the determination processing S6 is repeated.
In determination processing S6, if the mobile station is moving (if Yes), the mobile station turns on the reception function of the GPS module (S7), and sends information on the reception function of the GPS module to the base station 2, location information, and so on. and time information are transmitted, and the process returns to step S2. Transmission to the base station 2 is performed by polling response.
In this manner, the mobile station receives and suspends GPS positioning data while moving or stopping.

[Processing at the base station: FIGS. 4 and 5]
Next, processing of the base station will be described with reference to FIGS. FIG. 4 is a flow chart showing processing 1 of the base station, and FIG. 5 is a flow chart showing processing 2 of the base station. 4 and 5 are connected at (A) and (B), forming a series of processes.
As shown in FIG. 4, when starting processing (S11), the base station 2 issues a polling response request to the first mobile station 3 (S12), and receives position information and time information from the mobile station 3. (S13).
In the processes S12, S15, S23, and S25, when the position information and time information of the mobile station are received, if ON/OFF control of the receiving function of the GPS module is performed, the ON/OFF information is also included. to receive.

Next, the base station 2 makes a polling response request to the second mobile station 4 (S14), and receives position information and time information from the mobile station 4 (S15).
Then, the base station 2 determines whether or not the reception function of the GPS module of the mobile station 3 is off and there is no change in the position information (S16). Specifically, the base station 2 determines whether or not information indicating that the reception function of the GPS module is turned off has been received from the mobile station 3, and whether or not the received location information has changed compared to the previously received location information. do.

If the base station 2 has not received information indicating that the reception function of the GPS module is turned off from the mobile station 3, or if there is a change in the location information (No), the process returns to step S12.
If the base station 2 receives information indicating that the reception function of the GPS module is turned off from the mobile station 3 and there is no change in the location information (Yes), the frequency of polling response requests to the mobile station 3 is set to For example, it is set to 1 (decrease) every 5 times (S17). Then, the process moves to (A).

Next, as shown in FIG. 5, the base station 2 determines whether or not the mobile station 3 is subject to polling response requests (intervals) (S21). Whether or not it is the target time is the frequency set in step S17 (once in five times), that is, whether it is five times the normal interval (fifth time after four rests since the previous polling response request to the mobile station). is determined.
If the mobile station 3 is the target time of the polling response request (if Yes), the polling response request is sent to the mobile station 3 (S22), and the position information and time information are received from the mobile station 3 (S23).

Here, if the mobile station 3 does not continue to move even after receiving the polling response request, the reception function of the GPS module remains turned off and the GPS positioning data is not received. The location information and time information to be transmitted to the station 2 are information when the reception function of the GPS module is turned off. The mobile station 3 may transmit to the base station 2 time information based on an internal self-running clock.

Next, the base station 2 makes a polling response request to the mobile station 4 (S24), and receives position information and time information from the mobile station 4 (S25).
Also, in step S21, if the mobile station 3 is not the target time of the polling response request (if No), the process proceeds to step S24.

Next, the base station 2 determines whether the reception function of the GPS module of the mobile station 3 is turned on or whether there is a change in the location information (S26).
In other words, the base station 2 receives a notification that the reception function of the GPS module is turned on in the polling response from the mobile station 3, or recognizes that the received location information has changed compared to the previously received location information. If so (Yes), that is, if it is determined that the mobile station 3 is moving, the frequency of polling response requests to the mobile station 3 is initialized (changed from 1 out of 5 times to every time) (S27).

Further, in determination processing S26, the base station 2 has not received the notification that the reception function of the GPS module is turned on in the polling response from the mobile station 3, and the received location information is compared with the previously received location information. If it is recognized that there is no change (No), that is, if it is recognized as being stopped, the process returns to determination processing S21.
FIGS. 4 and 5 explain the processing when the mobile station 3 is in motion and the mobile station 4 is in motion. , 5, the mobile station 3 and mobile station 4 are reversed, and the mobile station 4 is subjected to the same process of stopping movement.

[Application example]
In the judgment process S26 of FIG. When the number of polling response requests made once per time reaches 10 times or more, the number of polling response requests to the mobile station 3 is changed to once every 20 times.
As a result, the frequency of polling response requests to the mobile station 3 that has been out of service for a long period of time can be further reduced, the processing load on the base station 2 can be reduced, and the occupation of radio resources can be reduced to effectively utilize radio resources. be.

[Monitor display example]
Next, display on the monitor 1a connected to the operation management device 1 will be described.
On the monitor 1a, a map including the area where the base station 2 communicates is displayed, and the mobile station for which the polling response request is requested is displayed on the map.

Here, since the operation management device 1 acquires the position information of the mobile station and the information of the mobile station in motion or at rest via the base station 2, it is displayed on the display monitor 1a so as to be distinguishable between the mobile station in motion or at rest. . For example, a moving mobile station is displayed with a dark colored icon on the map, and a stationary mobile station is displayed with a light colored icon.
When the icon of the mobile station is opened, history information of the mobile station may be displayed.

Also, the route (trajectory) of the movement history of the mobile station may be displayed on the monitor 1a.
Specifically, since the position information of the mobile station, the time information, and the ON/OFF information of the reception function of the GPS module are stored in the operation management device 1, plotting is performed based on the position information and the time information. to display the trajectory.

[Effects of Embodiment]
According to this system, when the mobile stations 3 and 4 acquire speed information from GPS positioning data and determine that they are stopped based on the speed information, they turn off the reception function of the GPS module, turn off the off information and position information, Time information is transmitted to the base station 2, and the base station 2 reduces the frequency of polling response requests to the mobile station based on the OFF information. This has the effect of shortening the time and making effective use of radio resources.

In addition, according to this system, when the mobile stations 3 and 4 determine movement by the acceleration sensor, the reception function of the GPS module is turned on to resume reception of GPS positioning data, and the base station 2 receives the ON information in response to the polling response request. Alternatively, the movement of the mobile station is recognized from the location information of the mobile station, and the frequency of polling response requests to the base station is returned to the normal interval (initialized), so the movement of the mobile station can be effectively managed. There are effects that can be done.

INDUSTRIAL APPLICABILITY The present invention is suitable for wireless communication systems, base stations, and mobile stations that can reduce current consumption in mobile stations and effectively utilize wireless resources.

DESCRIPTION OF SYMBOLS 1... Operation management apparatus 1a... Monitor 2... Base station 3, 4... Mobile station 5... GPS satellite

Claims (5)

A wireless communication system in which a base station and a mobile station wirelessly communicate,
When the mobile station stops moving, the mobile station turns off the function of receiving GPS positioning information and transmits the function-off information to the base station;
When the base station receives the function-off information from the mobile station, the base station reduces the frequency of polling response requests to the mobile station from the initial state . A wireless communication system characterized by further reducing the frequency of polling response requests . When the mobile station is moving, the mobile station turns on the function of receiving GPS positioning information and transmits the function-on information to the base station;
2. The radio communication system according to claim 1 , wherein said base station restores the frequency of polling response requests to said mobile station to an initial state when said function-on information is received from said mobile station. Having an operation management device that connects to a base station and performs operation management,
3. The wireless communication system according to claim 1, wherein said operation management device has a display monitor for displaying positional information of the mobile station received by said base station and information on whether the mobile station is moving or stopped. . A base station that performs wireless communication with a mobile station,
When information for turning off the function of receiving GPS positioning information is received from the mobile station, the frequency of polling response requests to the mobile station is reduced from the initial state , and when the movement stop of the mobile station continues, the mobile station A base station further reducing the frequency of polling response requests to . 5. The base station according to claim 4 , wherein upon receiving information for turning on the function of receiving GPS positioning information from a mobile station, the base station resets the frequency of polling response requests to the mobile station.

Images