JP2001060910A - Radio terminal device and reception control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio terminal which can reduce power consumption in a radio communication system whose service area is narrow. SOLUTION: In a radio terminal 1 which can use a radio communication system whose service area is narrow, a service area recognition part 4 collates a result obtained by permitting a position recognition part 2 to recognize the position of the radio terminal 1 itself by GPS or the like with information on the service area that can use the radio communication system accumulated in a service area information accumulation part 3. It is recognized whether the radio terminal 1 itself exists in the service area or not. The power of a reception part 6 of the radio communication system is turned on only in the service area with control of a reception control part 5 corresponding to the recognized result and the power of the reception part 6 of the radio communication system is turned off in a part out of the service area.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio terminal in a radio communication system, and more particularly to a radio terminal apparatus and a reception control method in a radio communication system having a narrow service area in which radio base stations are arranged in a spot manner.

[0002]

2. Description of the Related Art As a system for providing multimedia information to a user at high speed using wireless communication, a multimedia mobile access (Multimedia Mobile Access) is known.
Access Communication;
MAC) systems are being standardized. MMAC
In the system, a wireless base station is installed in a spot where users are concentrated, for example, at a railway station or the like.

On the other hand, in a wireless communication system, reduction in power consumption of a wireless terminal is indispensable for downsizing of a battery, that is, downsizing of a wireless terminal, and various technologies for this purpose have been developed. For example, there is a method of receiving only necessary control channels, and a method of receiving only necessary control channels in superframe units. These methods are effective when a terminal can receive radio waves. These techniques will be described with reference to FIGS. 19 and 20.

FIG. 19 is a block diagram showing a configuration example of a conventional radio terminal, and FIGS. 20 (a) and 20 (b) are conceptual diagrams showing a frame configuration example of a radio communication system.
The wireless terminal 1001 includes a receiving unit 1002 for receiving radio waves transmitted by the wireless base station, a reception control unit 1003 for controlling the receiving unit 1002, and a wireless terminal And a reception timing recognition unit 1004 for recognizing the timing to receive.

[0005] An operation example for reducing the power consumption of such a wireless terminal 1001 is shown in FIGS.
This will be described with reference to FIG. The wireless base station is shown in FIG.
Transmission and reception are performed in a frame configuration as shown in (a), and the broadcast channel broadcasts information to be notified to all wireless terminals, including information indicating the frame configuration. In the wireless terminal 1001, when the receiving unit 1002 receives the broadcast channel, the reception timing recognizing unit 1004 understands the content of the reception and the wireless terminal 1001 recognizes the timing to be received. Thereafter, the reception control unit 1003 can receive the necessary and sufficient amount of control information transmitted by the wireless base station at this timing. That is, for example, when only the broadcast channel is received, the receiving unit 1002 is activated in accordance with the timing at which the broadcast channel is transmitted, and the reception operation is not performed at other timings.
As shown in (b), in the case of a superframe configuration, an operation of receiving only a required channel in the superframe, for example, only a broadcast channel can be performed. By such an operation, the wireless terminal is in a service area of the wireless communication system, the frame configuration,
Or by understanding the superframe configuration,
Reception can be performed intermittently, and power consumption can be reduced.

However, in a wireless communication system in which a service area is formed in a spot like an MMAC system, the time during which the wireless terminal does not exist in the service area becomes longer. Is not reduced.

On the other hand, in the MMAC system, a hybrid system and a dual mode system which are used together with an existing wireless communication system are being studied. In such a system, as a method for reducing power consumption of a terminal, an MM is used in a broadcast channel of an existing wireless communication system.
There is a method of reporting AC service area information. That is, the base station of the existing wireless communication system is located near the MMA.
When the C base station is installed, a control message indicating this is broadcast, and the terminal receives the MM only when receiving the control message.
Activate the AC receiver. This technique will be described with reference to FIGS. 21, 22 and 23.

FIG. 21 is a block diagram showing a configuration example of a conventional radio terminal, and FIG.
S (Personal Handy phone Sy
FIG. 2 is a conceptual diagram showing an example of a cell configuration of a hybrid system or a dual mode system of FIG.
3 is an MMAC system and PDC (PersonalD
FIG. 1 is a conceptual diagram showing an example of a cell configuration of a hybrid system or a dual-mode system of FIG. The wireless terminal 1011 includes a first receiving unit 1012 capable of receiving radio waves of a first wireless communication system having a narrow service area, a reception control unit 1013 that controls the first receiving unit 1012, and a first wireless communication. A second receiving unit 1015 capable of receiving radio waves of a second wireless communication system having a wider service area than the system, and a second receiving unit 1
015 includes a service area recognizing unit 1014 for recognizing whether or not the wireless terminal 1011 is within the service area of the first wireless communication system based on the information received.

Next, MM is used as a first wireless communication system.
An operation example when a PHS is assumed as the AC system and the second wireless communication system will be described with reference to FIG. It is assumed that the wireless terminal 1011 moves as indicated by the arrow in the figure.

[0010] The PHS radio base station constituting the PHS radio cell including the MMAC service area broadcasts information indicating that an MMAC service area is present in the vicinity via a broadcast channel. In the wireless terminal 1011, the second
Is receiving the PHS broadcast channel, and the service area recognition unit 1014
It recognizes that a MAC service area exists. Then, the reception control unit 1013 sends the MM to the first reception unit 1012.
An instruction is issued to receive the radio wave of the AC system, and the first receiving unit 1012 performs the operation of receiving the radio wave of the MMAC system. Thereafter, the service area recognizing unit 1014 recognizes, at the point B, that the user has gone out of the MMAC service area from the information of the broadcast channel of the PHS received by the second receiving unit 1015, and the reception control unit 1013 sets the first receiving unit. 10
12 is instructed to stop receiving the radio wave of the MMAC system. By such an operation, the MMAC system and the PHS having the same cell radius as the MMAC system
In a hybrid system or a dual mode system, the wireless terminal performs an operation of receiving the radio wave of the MMAC system only when the service area of the MMAC system exists in the vicinity. As a result, MMAC
Eliminates the need to perform operations to receive system radio waves,
Power consumption can be reduced.

However, such a method is difficult in the case of a hybrid system of an MMAC system and an existing wireless communication system such as a PDC whose cell radius is much larger than the cell radius of the MMAC system, or a dual mode system. Has a problem that the effect of reducing power consumption is hardly obtained. This is because the radio cell of the existing radio communication system having a large cell radius is
In the case where the MMAC service area is included, the information indicating that the MMAC service area exists is broadcast, and the wireless terminal can transmit the information even outside the MMAC service area.
This is because the time for performing the receiving operation of the MMAC system becomes longer.

For example, an operation example of a hybrid system using an MMAC system and a PDC together or a dual mode system will be described with reference to FIG.
In this case, the second receiving unit 1 of the wireless terminal 1011 in FIG.
015 is receiving the broadcast channel of PDC. In the wireless terminal 1011, the service area recognition unit 1014 recognizes that an MMAC service area exists in the vicinity at the point C. Then, the reception control unit 1013 instructs the first receiving unit 1012 to receive the radio wave of the MMAC system, and the first receiving unit 1012 performs the operation of receiving the radio wave of the MMAC system. Thereafter, the service area recognizing unit 1014 recognizes that the MMAC service area is not in the vicinity at the point D based on the information of the broadcast channel of the PDC received by the second receiving unit 1015.
13 instructs the first receiving unit 1012 to stop receiving radio waves of the MMAC system. Thus, MM
Compared with the hybrid system using AC system and PHS or the dual mode system, MM
Even outside the service area of the AC system, the wireless terminal needs to perform the operation of receiving the radio wave of the MMAC system for a long time, which causes a problem that the power consumption increases.

[0013]

As described above,
A conventional wireless terminal in a wireless communication system in which wireless base stations are arranged in a spot, a wireless communication system in which a wireless base station is arranged in a spot like a hybrid system or a dual mode system, and a wireless communication system having a narrow service area. A conventional wireless terminal that can use both a wide wireless communication system has a problem that power consumption increases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and in a wireless communication system in which wireless base stations are arranged in a spot manner, a wireless terminal device capable of suppressing power consumption and its reception control. It aims to provide a method.

Further, the present invention can use both a wireless communication system having a narrow service area and a wireless communication system having a wide service area in which wireless base stations are arranged in a spot like a hybrid system or a dual mode system. In this case, an object of the present invention is to provide a wireless terminal device capable of suppressing power consumption low and a reception control method thereof.

[0016]

Means for Solving the Problems The present invention (claim 1) provides:
What is claimed is: 1. A wireless terminal device capable of using a wireless communication system for providing a communication service by wireless, comprising: a position recognition unit for recognizing a position where the own device is located; Service area storing means, based on the information indicating the location of the own apparatus recognized by the position recognizing means and the information on the service area stored in the service area storing means, the own apparatus executes the wireless communication system. A service area recognizing means for recognizing whether or not the wireless communication system is present in an available service area; and Performs control to receive radio waves of the wireless communication system, and the own device communicates with the wireless communication system. Wherein; and a reception control means for performing control to stop radio wave reception of the wireless communication system when it is recognized to be present in the service outside the area that can be use.

[0017] Preferably, means for receiving information on the service area in which the wireless communication system can be used from the wireless communication system, and determining whether information on the service area from the wireless communication system has been updated. Means for updating the service area information stored in the service area storage means to the latest service area information from the wireless communication system when it is determined that the information about the service area has been updated. May be further provided.

The present invention (claim 3) provides a first wireless communication system for providing a communication service wirelessly in a geographically narrow range, and a wireless communication in a geographically wider range than the first wireless communication system. A wireless terminal device that can use a second wireless communication system that provides a service,
Position recognition means for recognizing a position where the own device is located using information transmitted by a wireless base station of the wireless communication system, and a service for storing information relating to a service area in which the first wireless communication system can be used. The first wireless communication based on area storage means, information indicating the location of the own device recognized by the position recognition means, and information on the service area stored in the service area storage means; Service area recognizing means for recognizing whether or not the apparatus is in a service area in which the system can be used; and recognizing that the own apparatus is in a service area in which the first wireless communication system can be used by the service area recognizing means. Control is performed to receive the radio wave of the first wireless communication system, and Characterized by comprising a receiving control means for performing control to stop the radio wave reception of the wireless communication system when it is recognized to be present in the service outside the area available for.

The first wireless communication system may provide a high-speed communication service, and the second wireless communication system may provide a low-speed wireless communication service.

Preferably, the means for receiving from the first wireless communication system information relating to a service area in which the first wireless communication system can be used, and the information relating to the service area from the first wireless communication system being: Means for determining whether or not the service area has been updated, and, when it is determined that the information on the service area has been updated, the information on the service area stored in the service area storage means is transmitted to the first wireless device. Means for updating to the latest service area information from the communication system.

[0021] Alternatively, preferably, means for receiving, from the second wireless communication system, information on a service area in which the first wireless communication system can be used, and information on the service area from the second wireless communication system. Means for determining whether or not information has been updated, and, when it is determined that the information on the service area has been updated, the information on the service area stored in the service area storage means is stored in the second area. Means for updating to the latest service area information from the wireless communication system.

The present invention (claim 6) is a method for controlling reception of a wireless terminal device capable of using a wireless communication system for providing a communication service by wireless, which recognizes a position where the own device is present, and Based on the recognition result of the location of the wireless communication system and the information on the service area that can use the wireless communication system stored in the own device, whether the own device exists in the service area that can use the wireless communication system Recognize whether or not the own device is in a service area where the wireless communication system can be used, and perform control to receive the radio wave of the wireless communication system when the own device can use the wireless communication system. And controlling the wireless communication system to stop receiving radio waves when it is recognized that the wireless communication system is outside the service area.

It should be noted that the present invention relating to the apparatus is also realized as an invention relating to a method, and the present invention relating to a method is also realized as an invention relating to an apparatus.

According to the present invention, in a wireless communication system having a small service area, it is possible to prevent a wireless terminal from performing an unnecessary reception operation outside the service area, and to reduce power consumption. In particular, when a wireless communication system with a narrow service area and a wireless communication system with a wide service area are used together, such as a hybrid system or a dual mode system, reception control using a wireless communication system with a wide service area can be performed. However, it is possible to reduce the number of new functions added to the wireless terminal for this reception control.

Further, the wireless terminal can accumulate the latest information on the service area, thereby preventing a situation where the wireless communication system cannot be used even when the wireless terminal is located in a new service area. It is also possible to prevent a reception operation from being performed in a place changed outside the area.

Also, in the wireless terminal, the fact that the information on the service area of the first wireless communication system having a small service area has been updated indicates that the information on the second service area having a large service area has been updated.
Wireless terminal, the wireless terminal can recognize the change of the service area even if the service area does not enter the service area of the narrow wireless communication system for a long time. Becomes Also,
If the first wireless communication system is capable of high-speed transmission, the information pertaining to the service area itself is received via the first wireless communication system capable of high-speed transmission, so that the information is instantaneously received. It becomes possible. In addition, since the wireless terminal receives or stores only the information on the service area near the location where the wireless terminal exists, the amount of information to be received or stored as the information on the service area can be reduced.

Also, the radio terminal receives the information itself after recognizing that the information has been updated, without receiving the information itself regarding the service area in order to recognize whether or not the service area has been updated. By doing so,
It is possible to prevent the reception of information on the service area that has not been updated.

As described above, according to the present invention, the life of the battery can be extended, and a wireless communication system that is highly convenient for a user who carries the wireless terminal can be constructed.

[0029]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) First, the first embodiment of the present invention will be described with reference to the block diagram of FIG. 1 and the flowchart of FIG. FIG. 1 is a block diagram illustrating an example of a wireless terminal according to the present embodiment. A wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where a wireless base station is arranged in a spot manner can be used. 1 shows a configuration example of a wireless terminal. FIG. 2 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 1, the wireless terminal 1 of the present embodiment includes at least a receiving unit 6 for receiving a radio wave transmitted by a wireless base station, a receiving control unit 5 for controlling the receiving unit 6, Using a service area information storage unit 3 for storing information on a service area in which the wireless communication system can be used, a position recognition unit 2 for recognizing the position of the wireless terminal itself, and information on the position of the wireless terminal itself and the service area,
It is configured to include a service area recognizing unit 4 for recognizing whether or not the wireless terminal exists in the service area.

Here, as the "information about the service area" stored in the service area information storage unit, various forms can be considered. For example, in the case where the service area of the wireless communication system is treated as being inside a circle having a predetermined radius centered on the position of each wireless base station, the “information about the service area” is illustrated in FIG. Base station identifier of each wireless base station of the wireless communication system,
It may be represented using position information (for example, north latitude and east longitude) and radius. Also, for example, when the radius of the service area is constant regardless of the radio base station and radius data or data corresponding thereto is stored in advance in the wireless terminal, or when radius data is obtained by other means , Etc., the radius data may be omitted as shown in FIG. 3B. Also, for example, the service area of the wireless communication system is represented by polygon approximation, and the “information about the service area” is defined as a wireless base station identifier or a service area identifier of each wireless base station of the wireless communication system. Can be represented using the position information (for example, north latitude and east longitude) of each vertex of the approximate polygon. Note that the above points are the same for the second and third embodiments described later.

Next, an operation example of the wireless terminal 1 will be described.

In the wireless terminal 1, the position recognition unit 2 recognizes the position of the wireless terminal itself (for example, north latitude and east longitude) (step S11). As a method for recognizing this position, for example, there is a method using GPS. On the other hand, the service area storage unit 3 stores information on a service area in which the wireless communication system can be used. It is determined whether the terminal exists in the service area (step S1).
2).

For example, based on the north latitude, east longitude and radius of the wireless base station illustrated in FIG. 3A, and the recognized north latitude and east longitude of the wireless terminal itself, it is determined whether the wireless terminal exists in the service area. Judgment (more specifically, for example, among the wireless base stations of the wireless communication system, the condition that the distance between the north latitude / east longitude of the wireless base station and the north latitude / east longitude of the wireless terminal itself is equal to or less than the radius is satisfied. If such a wireless base station exists, it is determined that the wireless base station is within the service area). If necessary, it is possible to know which wireless base station exists in the service area. Note that the above points are the same for the second and third embodiments described later.

When the service area recognizing section 4 determines that the area is within the service area, the service area recognizing section 4 notifies the reception control section 5 to that effect. The reception control unit 5 instructs the reception unit 6 to perform an operation of receiving radio waves of the wireless communication system, and the reception unit 6 performs a reception operation (step S14).

On the other hand, when the service area recognizing section 4 determines that the area is outside the service area, the service area recognizing section 4 notifies the reception control section 5 to that effect. The reception control unit 5 instructs the reception unit 6 to stop the operation of receiving radio waves of the wireless communication system, and the reception unit 6 stops the reception operation (Step S13).

As a control method for performing or stopping the receiving operation, for example, a method for turning on or off the power of the entire receiver of the wireless terminal for receiving the radio wave of the wireless communication system is used. There is. In addition, as a method of controlling the power of a part of the receiver instead of the power of the entire receiver, for example, a method of inputting or masking a clock to a digital circuit part such as a baseband unit or a modulation / demodulation unit, an analog method of a reception amplifier or the like A method of turning on or off the power of the circuit portion is possible.

As described above, the wireless terminal according to the present embodiment performs the receiving operation only in the service area where the wireless communication system can be used, and does not perform the receiving operation outside the service area. It is possible to reduce power consumption in a wireless communication system in which stations are arranged.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to the block diagram of FIG. 4 and the flowchart of FIG. FIG. 4 is a block diagram illustrating an example of a wireless terminal according to the present embodiment. A wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where a wireless base station is arranged in a spot manner can be used. 1 shows an example of the configuration of a wireless terminal. FIG. 5 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 4, the wireless terminal 21 of the present embodiment includes at least a receiving unit 29 for receiving a radio wave transmitted by a wireless base station, a receiving control unit 26 for controlling the receiving unit 29, A service area information receiving unit 28 that receives information about a service area where a wireless communication system can be used, a service area information checking unit 27 that checks whether information about the service area has been updated, and stores information about the service area. A service area information storage unit 25, a service area information update unit 24 for updating information on the service area stored in the service area information storage unit 25, a position recognition unit 22 for recognizing the position of the wireless terminal itself, The wireless terminal exists in the service area using the position and the information on the service area. Configured to include a service known area recognition unit 23 as to whether or not.

Next, an operation example of the wireless terminal 21 will be described.

In the wireless terminal 21, the position recognition unit 22
Recognizes the position of the wireless terminal itself (for example, north latitude and east longitude) (step S31). As a method for recognizing this position, for example, there is a method using GPS. On the other hand, the service area information storage unit 25 stores information about a service area in which a wireless communication system can be used. It is determined whether the wireless terminal is within the service area (step S32).

If the service area recognizing unit 23 determines that the service area is outside the service area, the reception control unit 2 informs the fact.
Notify 6. The reception control unit 26 instructs the reception unit 29 to stop the operation of receiving the radio wave of the wireless communication system, and the reception unit 29 stops the reception operation (Step S33).

On the other hand, when the service area recognizing section 23 determines that the service area is within the service area, it notifies the reception control section 26 to that effect. The reception control unit 26 includes a reception unit 29
Is instructed to perform an operation of receiving radio waves of the wireless communication system, and the receiving unit 29 performs a receiving operation (step S34). If the service area information receiving unit 28 has received the information on the service area (step S35), the service area information confirming unit 27 transmits the information on the service area received by the service area information receiving unit 28 to the service area. The information is compared with the information on the service area stored in the storage unit 25 (step S36), and when the information is updated (for example, as a result of the comparison,
If some or all of the information on the service area does not match, the service area information updating unit 24 replaces the information on the service area stored in the service area information storage unit 25 with newly received new information ( Step S37). The determination as to whether or not the information on the service area has been updated may be made, for example, by adding version information (for example, a sequence number indicating the version or the last update date and time) to the information on the service area, and It may be performed based on.

Here, the wireless terminal 21 can receive the information on the service area by issuing a request from the wireless terminal and receiving it by transmitting it to the wireless terminal based on the request from the network. There is. Examples of the former include a method of requesting and receiving information on the service area from the wireless terminal at regular intervals, a method of issuing and receiving a request when the wireless terminal is turned on, and a wireless communication system in the wireless terminal. A method of requesting and receiving information on the service area when a request to use occurs, a method of requesting and receiving information when a wireless terminal roams across different carriers, and the like can be given. On the other hand, as an example of the latter, a method of transmitting information on the service area from the network side to the wireless terminal at regular time intervals, and a method of transmitting information on the service area from the network side to the wireless terminal when the information on the service area is changed And the like.
In the method of transmitting information from the network to the wireless terminal when the information regarding the service area changes, since information about the service area is not transmitted from the network to the wireless terminal when the change does not occur,
It is possible to prevent useless communication. Note that when these methods are used, when transmission to a wireless terminal fails, it is possible to repeatedly perform distribution multiple times from the network side to increase the reliability of distribution of information regarding a service area. .

The information on the service area received or stored by the wireless terminal covers a wide range, such as information on a service area nationwide or information on all service areas of a business in which the wireless terminal is located. Information. On the other hand, a method may be used in which the wireless terminal receives or accumulates only information regarding the service area near the location where the wireless terminal exists, such as having only information regarding the service area of the location registration area where the wireless terminal exists. By these methods, the wireless terminal receives,
Alternatively, the amount of information on the service area to be stored can be reduced. In addition, the amount of information on the service area stored by the storage device on the network side that stores the information on the service area can be reduced, and even if the service area is changed due to the addition of radio base stations, the change is not changed. The change may be made only in the storage device in the vicinity where the change occurred.

In order to automatically update the information on the service area due to the addition of the radio base stations on the network side, each radio base station may have means for recognizing its own position. That is, for example, when a wireless base station is added, the wireless base station recognizes its own position using GPS and sends the wireless base station to a storage device on the network side that stores information on a service area. Notify own location information. Alternatively, the storage device may periodically collect the position information of the wireless base station.

As described above, the wireless terminal of the present invention performs a receiving operation only in a service area where a wireless communication system can be used, and does not perform a receiving operation outside the service area. It is possible to reduce power consumption in a deployed wireless communication system. In addition, the wireless terminal can accumulate the latest information on the service area in which the wireless communication system can be used, thereby preventing a situation in which the wireless communication system cannot be used even though the wireless terminal actually exists in the service area. It becomes possible.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to the block diagram of FIG. 6 and the flowchart of FIG. FIG. 6 is a block diagram illustrating an example of the wireless terminal according to the present embodiment. A wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where a wireless base station is arranged in a spot manner can be used. 1 shows a configuration example of a wireless terminal. FIG. 7 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 6, the wireless terminal 41 of the present embodiment includes at least a receiving unit 48 for receiving a radio wave transmitted by a wireless base station, a receiving control unit 45 for controlling the receiving unit 48, A service area information receiving unit 47 for receiving information about a service area in which the wireless communication system can be used, a service area information checking unit 49 for checking whether information about the service area has been updated, and storing information about the service area. A service area information storage unit 44, a service area information update unit 46 for updating information on the service area stored in the service area information storage unit 44, a position recognition unit 42 for recognizing the position of the wireless terminal itself, The wireless terminal exists in the service area using the position and the information on the service area. Configured to include a service known area recognition unit 43 as to whether or not.

Next, an operation example of the wireless terminal 41 will be described.

In the wireless terminal 41, a position recognition unit 42
Recognizes the position of the wireless terminal itself (for example, north latitude and east longitude) (step S51). As a method for recognizing this position, for example, there is a method using GPS. On the other hand, the service area information storage unit 44 determines whether or not the wireless terminal exists in the service area based on the information on the service area in which the wireless communication system can be used and the position information of the wireless terminal itself (step S52). ).

When the service area recognizing section 43 determines that the area is outside the service area, the reception control section 4 informs the fact.
Notify 5 The reception control unit 43 instructs the reception control unit 45 to stop the operation of receiving radio waves of the wireless communication system, and the reception unit 48 stops the reception operation (step S57).

On the other hand, when the service area recognizing section 43 determines that the vehicle is within the service area, the service area recognizing section 43 notifies the reception control section 45 to that effect. The reception control unit 45 includes a reception unit 48
Is instructed to perform an operation of receiving radio waves of the wireless communication system, and the receiving unit 48 performs a receiving operation (step S53). The service area information confirmation unit 49 determines whether or not the information on the service area of the wireless communication system has been updated (step S54).
Of the service area is received.

Here, the service area information confirmation section 49
However, as a method for recognizing whether or not the information on the service area has been updated, a method in which a request is issued from the wireless terminal to the network side to confirm whether or not the information has been updated, There is a method of transmitting information about updating to a wireless terminal based on the information.

As an example of the former, a method in which the wireless terminal checks with the network side at regular time intervals whether information on the service area is updated or not, when the wireless terminal is powered on, A method for confirming whether or not information on the service area has been updated when a request to use a wireless communication system has occurred in a wireless terminal; and a method for confirming whether a wireless terminal has roamed across different operators. There is a method of checking with the side.

On the other hand, as an example of the latter, for example, a radio base station broadcasts version information of information on a service area, and a radio terminal receives this version information.
The wireless terminal accesses the latest information on the service area if the version received immediately before from the wireless base station is newer than the version update information of the stored information on the service area. Instead of the version information, it is also possible to use a time stamp at which information on the service area is issued.
Further, when the information regarding the service area is changed, the network side may notify the wireless terminal.

As described above, when the service area information receiving unit 47 receives the information on the latest service area (step S55), the service area information updating unit 4
6 replaces the information on the service area stored in the service area information storage unit 44 with the latest information (step S56).

As described above, the wireless terminal of the present invention performs a receiving operation only in a service area where a wireless communication system can be used, and does not perform a receiving operation outside a service area. It is possible to reduce power consumption in a deployed wireless communication system. In addition, the wireless terminal can accumulate the latest information on the service area in which the wireless communication system can be used, thereby preventing a situation in which the wireless communication system cannot be used even though the wireless terminal actually exists in the service area. It becomes possible. Further, since the wireless terminal receives the information after recognizing that the information has been updated without receiving the information on the service area itself, it is possible to prevent reception of information on the service area that has not been updated. Becomes

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to the block diagram of FIG. 8 and the flowchart of FIG. FIG. 8 is a block diagram illustrating an example of a wireless terminal according to the present embodiment. A first wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where wireless base stations are arranged in a spot manner. 2 shows a configuration example of a wireless terminal that can use a second wireless communication system that provides communication services to wireless terminals in a geographically wider range than the first wireless communication system.
FIG. 9 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 8, the radio terminal 61 of the present embodiment transmits at least the radio wave transmitted by the radio base station of the first radio communication system that provides a high-speed radio communication service in a geographically narrow range. A first receiving unit 67 for receiving the first receiving unit, a receiving control unit 66 for controlling the first receiving unit 67,
Service area information storage unit 6 for storing information on service areas in which the first wireless communication system can be used
5. A second radio communication system that provides a low-speed wireless communication service to wireless terminals in a geographically wider area than the first wireless communication system. 2 receiving section 62, the second receiving section 6
2, a position recognition unit 63 for recognizing the position of the wireless terminal itself from the information received, and using the information on the position of the wireless terminal itself and the service area to recognize whether or not the wireless terminal exists in the service area. Service area recognition unit 64
It is comprised including.

Here, various forms are conceivable as the “information about the service area” stored in the service area information storage unit. For example, in the case where the service area of the wireless communication system is treated as being inside a circle having a predetermined radius centered on the position of each wireless base station, the “information about the service area” is illustrated in FIG. Base station identifier of each wireless base station of the wireless communication system,
It may be represented using position information (for example, north latitude and east longitude) and radius. Also, for example, when the radius of the service area is constant regardless of the radio base station and radius data or data corresponding thereto is stored in advance in the wireless terminal, or when radius data is obtained by other means , Etc., the radius data may be omitted as shown in FIG. 3B. Also, for example, the service area of the wireless communication system is represented by polygon approximation, and the “information about the service area” is the base station identifier or service area identifier of each wireless base station of the wireless communication system, Position information of each vertex of the approximate polygon (for example, north latitude and east longitude)
It is also possible to represent using. The above points are the same for the fifth to ninth embodiments.

In this embodiment, the position of the wireless base station of the second wireless communication system is stored in the wireless terminal in order for the wireless terminal to recognize the position of the wireless terminal itself using the second wireless communication system. Information about the system. As this information, for example, information expressed using the identifier and position information (for example, north latitude and east longitude) of each wireless base station of the second wireless communication system may be stored (FIG. 3). (B)). The above points are the same for the fifth to ninth embodiments.

Next, an operation example of the wireless terminal 61 will be described.

In the wireless terminal 61, the second receiving unit 6
2 receives radio waves from the wireless base station of the second wireless communication system (step S71). The position recognition unit 63 recognizes the position of the wireless terminal 61 itself (for example, north latitude and east longitude) using the information received by the second reception unit 62 (step S72).

As a method of recognizing the position, for example, signals can be received from a plurality of radio base stations of the second radio communication system, and the position can be recognized from the time difference between the signals. In the case of this method, each radio base station broadcasts a radio base station identifier unique to the radio base station,
The same code is broadcast at the same time. The wireless terminal receives a wireless base station identifier and a code from a plurality of wireless base stations, obtains a positional relationship with each wireless base station by using a time lag when the code is received, and stores the wireless terminal in advance. It is possible to recognize the position of the wireless terminal itself by using the position information of the existing wireless base station.

As another method of recognizing the position,
For example, it is possible to use the received electric field strength of signals from a plurality of wireless base stations. That is, the wireless terminal receives signals from a plurality of wireless base stations of the second wireless communication system, measures the received electric field strength of these signals, obtains a positional relationship with each wireless base station, and It is possible to recognize the position of the wireless terminal itself by using the position information of the wireless base station which is held in advance.

In order for the wireless terminal 61 to recognize the position of the wireless terminal itself, it is necessary to hold the position information of the wireless base station of the second wireless communication system. Information represented by using identifiers and position information (for example, north latitude and east longitude) of each base station of the wireless communication system is stored (see FIG. 3B).

The service area information storage section 65 stores information on a service area in which the first wireless communication system can be used. The service area recognition section 64 stores the information on the service area and the radio terminal information. It is determined whether or not the wireless terminal is within the service area based on its own location information (step S73).

For example, based on the north latitude / east longitude and radius of the wireless base station of the first wireless communication system illustrated in FIG. 3A, and the recognized north latitude / east longitude of the wireless terminal itself,
It is determined whether or not the wireless terminal is within the service area of the first wireless communication system (more specifically, for example, among the wireless base stations of the first wireless communication system, the north latitude of the wireless base station, If there is a wireless base station that satisfies the condition that the distance between the east longitude and the north latitude / east longitude of the wireless terminal itself is equal to or less than the radius, it is determined that the wireless base station is within the service area of the first wireless communication system). If necessary, it is possible to know which wireless base station exists in the service area. This is the same for the fifth to ninth embodiments described later.

If the service area recognizing section 64 determines that the area is outside the service area, the reception control section 6 informs the fact.
Notify 6. The reception control unit 66 instructs the first reception unit 67 to stop the operation of receiving the radio wave of the first wireless communication system, and the first reception unit 67 stops the reception operation. (Step S74).

On the other hand, when the service area recognizing section 64 determines that the service area is within the service area, it notifies the reception control section 66 to that effect. The reception control unit 66 instructs the first reception unit 67 to perform an operation of receiving radio waves of the first wireless communication system, and the first reception unit 6
7 performs a receiving operation (step S75).

The control method for performing or stopping the reception operation includes, for example, turning on the power of the entire receiver for receiving the radio wave of the first wireless communication system of the wireless terminal, or There is a way to cut it. In addition, as a method of controlling the power of a part of the receiver instead of the power of the entire receiver, for example, a method of inputting or masking a clock to a digital circuit part such as a baseband unit or a modulation / demodulation unit, an analog method of a reception amplifier or the like A method of turning on or off the power of the circuit portion is possible.

As described above, the radio terminal of the present invention performs a reception operation only in a service area where a radio communication system can be used, even if the service area where the radio communication system can be used is narrow, and performs a reception operation outside the service area. Because we do not do
Power consumption can be reduced in a wireless communication system in which wireless base stations are arranged in a spot manner. When a wireless communication system with a small service area and a wireless communication system with a large service area are used together, such as a hybrid system and a dual mode system,
The above-described reception control can be performed using a wireless communication system having a wide service area, and it is possible to reduce the number of new functions added to the wireless terminal for the reception control.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to the block diagram of FIG. 10 and the flowchart of FIG. FIG. 10 is a block diagram illustrating an example of a wireless terminal according to the present embodiment, and a first wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where wireless base stations are arranged in a spot manner. 2 shows a configuration example of a wireless terminal that can use a second wireless communication system that provides communication services to wireless terminals in a geographically wider range than the first wireless communication system. FIG. 11 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 10, the radio terminal 81 of the present embodiment transmits at least the radio wave transmitted by the radio base station of the first radio communication system that provides a high-speed radio communication service in a geographically narrow range. Receiving section 90 for receiving the data, and a receiving control section 8 for controlling the first receiving section 90
7, a service area information storage unit 86 for storing information on a service area in which the first wireless communication system can be used, and a wireless communication with a lower speed for wireless terminals in a geographically wider range than the first wireless communication system. A second receiving unit for receiving a radio wave transmitted by a wireless base station of a second wireless communication system for providing a communication service, and recognizing a position of the wireless terminal itself from information received by the second receiving unit A service area recognizing unit 83 for recognizing whether or not the wireless terminal is present in the service area by using the position of the wireless terminal itself and information on the service area.
4. Further, the radio terminal 81 stores at least information on a service area in which the first radio communication system can be used in order to accumulate information on the latest service area. A service area information confirmation unit 88 for confirming whether the information has been updated,
A service area information updating unit 85 for updating information on the service area stored in the service area information storing unit 86 is included.

Next, an operation example of the wireless terminal 81 will be described.

In the wireless terminal 81, the second receiving unit 8
2 receives the radio wave of the wireless base station of the second wireless communication system (step S101). The position recognition unit 83 recognizes the position (for example, north latitude and east longitude) of the wireless terminal 81 itself using the information received by the second reception unit 82 (step S102).

As a method of recognizing the position, for example, signals can be received from a plurality of radio base stations of the second radio communication system, and the position can be recognized from the time difference between the signals. In the case of this method, each radio base station broadcasts a radio base station identifier unique to the radio base station,
The same code is broadcast at the same time. The wireless terminal receives a wireless base station identifier and a code from a plurality of wireless base stations, obtains a positional relationship with each wireless base station by using a time lag when the code is received, and stores the wireless terminal in advance. It is possible to recognize the position of the wireless terminal itself by using the position information of the existing wireless base station. Of course, as described above, it is also possible to recognize the position using the received electric field strength.

The service area information storage unit 86 stores information on a service area where the first wireless communication system can be used. It is determined whether or not the wireless terminal is within the service area based on its own location information (step S103).

When the service area recognizing section 84 recognizes that it is out of the service area, the reception control section 8 informs the fact.
Notify 7. The reception control unit 87 instructs the first reception unit 90 to stop the operation of receiving the radio wave of the first wireless communication system, and the first reception unit 90 stops the reception operation. (Step S108).

On the other hand, when the service area recognizing unit 84 determines that the vehicle is within the service area, the service control unit 84 notifies the reception control unit 87 of the determination. The reception control unit 87 instructs the first reception unit 90 to perform an operation of receiving radio waves of the first wireless communication system, and the first reception unit 9
0 performs a receiving operation (step S104). When the service area information receiving unit 89 receives the information on the service area (via the first receiving unit 90) (Step S105), the service area information confirming unit 88 receives the information from the service area information receiving unit 89. The information on the service area thus obtained is compared with the information on the service area stored in the service area information storage unit 86 (step S106). If the information is updated (for example, as a result of the comparison, a part of the information on the service area or If they do not all match, the service area information updating unit 85
Replaces the information on the service area stored in the service area information storage unit 86 with the newly received new information (step S107). The determination as to whether or not the information on the service area has been updated is made, for example, by adding version information (for example, a sequence number indicating the version,
Alternatively, the update may be performed based on the version information.

Here, as a method for the wireless terminal to receive the information on the service area, there are a method of receiving a request from the wireless terminal side and a method of transmitting the request to the wireless terminal based on the request of the network side. is there. As an example of the former,
A method for requesting and receiving information on the service area from the wireless terminal at regular intervals, a method for issuing and receiving a request when the wireless terminal is turned on,
A method for requesting and receiving information on a service area of the first wireless communication system when a request to use the wireless communication system is issued, A receiving method may be used. Further, a method may be used in which a request is issued and received when the wireless terminal moves across wireless base stations of the second wireless communication system or when location registration is performed in the second wireless communication system. On the other hand, as an example of the latter, information on the service area of the first wireless communication system is transmitted from the network side to the wireless terminal at regular intervals via the first wireless communication system or the second wireless communication system. A method of transmitting the information, a method of transmitting the information from the network to the wireless terminal only when information on the service area is changed, and the like can be given. Note that when these methods are used, when transmission to a wireless terminal fails, it is possible to repeatedly perform distribution multiple times from the network side to increase the reliability of distribution of information regarding a service area. .

The information on the service area received or stored by the wireless terminal may be information on a service area nationwide or information on all service areas of a second wireless communication system operator in which the wireless terminal is located. And a wide range of information.
On the other hand, in the location registration area of the second wireless communication system in which the wireless terminal exists, only the information related to the service area of the first wireless communication system is received or stored, or the second wireless communication to which the wireless terminal can connect is provided. A method in which a wireless terminal receives or stores only information about a service area near a location where a wireless terminal is present, such as receiving or storing only information about a service area of a first wireless communication system near a wireless base station of the system May be. According to these methods, it is possible to reduce the amount of information about the service area received or stored by the wireless terminal. In addition, the amount of information on the service area stored by the storage device on the network side that stores the information on the service area can be reduced, and even if the service area is changed due to the addition of radio base stations, the change is not changed. The change may be made only in the storage device in the vicinity where the change occurred.

In order to automatically update the information on the service area on the network side by adding radio base stations of the first radio communication system, means for each radio base station to recognize its own position. May be provided. That is, for example, when a wireless base station is added, the wireless base station recognizes its own position using the GPS or the second wireless communication system, and stores the information on the service area in a storage device on the network side. On the other hand, the base station notifies the position information of the wireless base station itself. Alternatively, the storage device may periodically collect the position information of the wireless base station.

As described above, even when the service area where the wireless communication system can be used is small, the wireless terminal of the present invention does not perform unnecessary reception operation outside this service area, so Power consumption can be reduced in a wireless communication system in which wireless base stations are arranged. When a wireless communication system with a narrow service area and a wireless communication system with a wide service area are used together, such as a hybrid system and a dual mode system, the above-described reception control is performed using a wireless communication system with a wide service area. Can do
It is possible to reduce the number of new functions added to the wireless terminal for this reception control. Furthermore, the wireless terminal can accumulate the latest information on the service area, thereby preventing a situation in which the wireless communication system cannot be used even though the wireless terminal is located in a new service area, and also enables the wireless terminal to be out of the service area. It is also possible to prevent the receiving operation from being performed at the changed location.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to the block diagram of FIG. 12 and the flowchart of FIG. FIG. 12 is a block diagram illustrating an example of a wireless terminal according to the present embodiment, and a first wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where wireless base stations are arranged in a spot manner. 2 shows a configuration example of a wireless terminal that can use a second wireless communication system that provides communication services to wireless terminals in a geographically wider range than the first wireless communication system. FIG. 13 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 12, at least the radio terminal 111 of the present embodiment transmits radio waves transmitted by the radio base station of the first radio communication system that provides high-speed radio communication services in a geographically narrow range. Receiving section 119 for receiving the information, a reception control section 116 for controlling the first receiving section 119, and a service area information storage section for storing information relating to a service area in which the first wireless communication system can be used. 115, a second radio communication system for providing a low-speed radio communication service to a radio terminal in a geographically wider area than the first radio communication system for receiving radio waves transmitted by a radio base station of the second radio communication system; No. 2 receiving section 112, a position recognizing section 113 for recognizing the position of the wireless terminal itself from the information received by the second receiving section 112, Using the information, configured to include a service known area recognizing section 114 whether the wireless terminal is present in the service area. Further, the wireless terminal 111 stores at least information on a service area in which the first wireless communication system can be used in order to accumulate information on the latest service area. The service area information checking unit 120 checks whether or not information has been updated, and the service area information updating unit 117 updates information about the service area stored in the service area information storage unit 115. .

Next, an operation example of the wireless terminal 111 will be described.

In the wireless terminal 111, the second receiving section 112 receives the radio wave of the wireless base station of the second wireless communication system (step S131). Position recognition unit 113
Uses the information received by the second receiving unit 112,
The position of the wireless terminal 111 itself (for example, north latitude and east longitude) is recognized (step S132).

As a method of recognizing the position, for example, signals can be received from a plurality of radio base stations of the second radio communication system, and the position can be recognized from the time difference between them. In the case of this method, each radio base station broadcasts a radio base station identifier unique to the radio base station,
The same code is broadcast at the same time. The wireless terminal receives a wireless base station identifier and a code from a plurality of wireless base stations, obtains a positional relationship with each wireless base station by using a time lag when the code is received, and stores the wireless terminal in advance. It is possible to recognize the position of the wireless terminal itself by using the position information of the existing wireless base station. Of course, as described above, it is also possible to recognize the position using the received electric field strength.

[0093] The service area information storage section 115 stores information on a service area in which the first wireless communication system can be used. It is determined whether or not the wireless terminal is within the service area based on its own location information (step S13).
3). If the service area recognition unit 114 determines that the service area is outside the service area, the reception control unit 11
Notify 6. The reception control unit 116 is the first reception unit 11
9 to stop the operation of receiving the radio wave of the first wireless communication system.
19 stops the receiving operation (step S138).

On the other hand, when the service area recognizing unit 114 determines that the service area is within the service area, it notifies the reception control unit 166 to that effect. The reception control unit 166 has the first
Is instructed to perform an operation of receiving radio waves of the first wireless communication system, and the first receiving unit 119 performs a receiving operation (step S134).

The service area information confirming section 120 determines whether or not the information on the service area of the first wireless communication system has been updated (step S135). It instructs the information receiving unit 118 to receive the information on the service area.

Here, the service area information confirmation unit 120
However, as a method for recognizing whether or not the information on the service area has been updated, a method in which a request is issued from the wireless terminal to the network side to confirm whether or not the information has been updated, There is a method of transmitting information about updating to a wireless terminal based on the information.

[0097] As an example of the former, a method for confirming whether or not the information regarding the service area of the first wireless communication system has been updated from the wireless terminal to the network side at regular time intervals, A method for confirming to a network upon entering, a method for confirming whether or not information on the service area has been updated when a request to use the first wireless communication system has occurred in the wireless terminal; Method for confirming to the network side when roaming across different operators of the second wireless communication system, and method for confirming to the network side when a wireless terminal performs location registration in the second wireless communication system When the wireless terminal moves across different wireless base stations of the second wireless communication system, the wireless terminal checks with the network side Law, and the like.

On the other hand, as an example of the latter, for example, the radio base station of the second radio communication system or the first radio communication system broadcasts version information of information on the service area, and the radio terminal transmits this version information. The wireless terminal accesses the latest information on the service area if the version received immediately before from the wireless base station is newer, by comparing the received and accumulated information on the service area with the version update information. Also,
Instead of the version information, it is also possible to use the time stamp at which the information on the service area was issued. Further, when the information on the service area is changed, the network side may notify the wireless terminal via the second wireless communication system or the first wireless communication system.

In this way, the service area information receiving section 118 communicates (via the first receiving section 119) with the first
When the service area information update unit 117 receives the information on the latest service area related to the wireless communication system (step S136), the service area information update unit 117 replaces the information on the service area stored in the service area information storage unit 115 with the latest information (step S136). S136).

As described above, even when the service area where the wireless communication system can be used is small, the wireless terminal of the present invention does not perform unnecessary reception operations outside this service area. Power consumption can be reduced in a wireless communication system in which wireless base stations are arranged. When a wireless communication system with a narrow service area and a wireless communication system with a wide service area are used together, such as a hybrid system and a dual mode system, the above-described reception control is performed using a wireless communication system with a wide service area. Can do
It is possible to reduce the number of new functions added to the wireless terminal for this reception control. Furthermore, the wireless terminal can accumulate the latest information on the service area, thereby preventing a situation in which the wireless communication system cannot be used even though the wireless terminal is located in a new service area, and also enables the wireless terminal to be out of the service area. It is also possible to prevent the receiving operation from being performed at the changed location. Also, the wireless terminal receives the information after recognizing that the information has been updated without receiving the information on the service area itself to recognize whether the service area has been updated. It is possible to prevent the reception of information on service areas that are not available.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described with reference to the block diagram of FIG. 14 and the flowchart of FIG. FIG. 14 is a block diagram illustrating an example of a wireless terminal according to the present embodiment, in which a first wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where a wireless base station is arranged in a spot manner. 2 shows a configuration example of a wireless terminal that can use a second wireless communication system that provides communication services to wireless terminals in a geographically wider range than the first wireless communication system. FIG. 15 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 14, the radio terminal 141 of the present embodiment transmits at least the radio wave transmitted by the radio base station of the first radio communication system that provides a high-speed radio communication service in a geographically narrow range. Receiving section 150 for receiving the first wireless communication system, a receiving control section 149 for controlling the first receiving section 150, and a service area information storing section for storing information on a service area in which the first wireless communication system can be used. 146, a second radio communication system that provides a low-speed radio communication service to a radio terminal in a geographically wider range than the first radio communication system. 2 receiving section 144, a position recognizing section 147 for recognizing the position of the wireless terminal itself from the information received by the second receiving section 144, the position of the wireless terminal itself and the service area. Using the information, configured to include a service known area recognizing section 148 whether the wireless terminal is present in the service area. Further, the wireless terminal 141 stores at least information on a service area in which the first wireless communication system can be used via the second receiving unit 144 in order to accumulate information on the latest service area. An area information receiving unit 143, a service area information confirming unit 142 for confirming whether information on the service area has been updated,
A service area information updating unit 145 for updating information on the service area stored in the service area information storing unit 146 is included.

Next, an operation example of the wireless terminal 141 will be described.

In the radio terminal 141, the second receiving section 144 receives radio waves from the radio base station of the second radio communication system (step S161). The service area information receiving unit 143 communicates with the first
When the information on the latest service area related to the service area in which the wireless communication system can be used is received (step S162), the service area information confirmation unit 1
42 compares the information on the service area received by the service area information receiving unit 143 with the information on the service area stored in the service area information storage unit 146 (step S163), and updates the information (for example, If the result of the comparison indicates that some or all of the information related to the service area does not match, the service area information updating unit 145 sends the service area information storage unit 14
5 is replaced with the new information newly received (step S16).
4). The determination as to whether or not the information on the service area has been updated may be made, for example, by adding version information (for example, a sequence number indicating the version or the last update date and time) to the information on the service area, and It may be performed based on.

The position recognizing unit 147 is connected to the second receiving unit 14.
4 recognizes the position (for example, north latitude and east longitude) of the wireless terminal 141 itself using the information received (step S165).

As a method of recognizing the position, for example, signals can be received from a plurality of radio base stations of the second radio communication system, and the position can be recognized from a time difference between these signals. In the case of this method, each radio base station broadcasts a radio base station identifier unique to the radio base station,
The same code is broadcast at the same time. The wireless terminal receives a wireless base station identifier and a code from a plurality of wireless base stations, obtains a positional relationship with each wireless base station by using a time lag when the code is received, and the wireless terminal has in advance. It is possible to confirm the position of the wireless terminal itself by using the position information of the existing wireless base station. Of course, as described above, it is also possible to recognize the position using the received electric field strength.

The service area information storage section 146 stores information on a service area in which the first wireless communication system can be used. It is determined whether or not the wireless terminal is within the service area based on the own location information (step S16).
6). If the service area recognition unit 148 recognizes that the service area is outside the service area, the reception control unit 14
Notify 9. The reception control unit 149 is the first reception unit 15
0 to stop the operation of receiving the radio wave of the first wireless communication system.
50 stops the receiving operation (step S167).

On the other hand, when the service area recognizing section 148 recognizes that it is in the service area, it notifies the reception control section 149 to that effect. The reception control unit 149 is the first
Is instructed to perform an operation of receiving radio waves of the first wireless communication system, and the first receiving unit 150 performs a receiving operation (step S168).

As described above, even when the service area where the wireless communication system can be used is small, the wireless terminal of the present invention does not perform unnecessary receiving operation outside this service area, and therefore, the wireless terminal can be used in a spot-like manner. Power consumption can be reduced in a wireless communication system in which wireless base stations are arranged. When a wireless communication system with a narrow service area and a wireless communication system with a wide service area are used together, such as a hybrid system and a dual mode system, it is possible to perform reception control using a wireless communication system with a wide service area. However, it is possible to reduce the number of new functions added to the wireless terminal for this reception control. Furthermore, the wireless terminal can accumulate the latest information on the service area, thereby preventing a situation where the wireless communication system cannot be used even though the wireless terminal is located in a new service area, and the wireless terminal can be stored outside the service area. It is also possible to prevent the receiving operation from being performed at the changed location. In addition, since the wireless terminal receives information related to the service area of the wireless communication system having a small service area and updates of this information via the wireless communication system having a large service area, the wireless terminal receives the service area of the wireless communication system having a small service area. Even if the service area does not enter for a long time, it is possible to recognize this change in the service area, and it is possible to construct a wireless communication system that is easy for the user to use.

(Eighth Embodiment) Next, an eighth embodiment of the present invention will be described with reference to the block diagram of FIG. 16 and the flowchart of FIG. FIG. 17 is a block diagram illustrating an example of a wireless terminal according to the present embodiment, in which a first wireless communication system that provides a communication service to a wireless terminal in a geographically narrow area where wireless base stations are arranged in a spot manner. 2 shows a configuration example of a wireless terminal that can use a second wireless communication system that provides communication services to wireless terminals in a geographically wider range than the first wireless communication system. FIG. 17 is a flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment.

As shown in FIG. 16, the radio terminal 171 of the present embodiment transmits at least radio waves transmitted by the radio base station of the first radio communication system that provides a high-speed radio communication service in a geographically narrow range. Receiving section 180 for receiving the first wireless communication system, a receiving control section 179 for controlling the first receiving section 180, and a service area information storage section for storing information relating to a service area in which the first wireless communication system can be used. 177, a second radio communication system for receiving radio waves transmitted by a radio base station of a second radio communication system that provides a low-speed radio communication service to radio terminals in a geographically wider range than the first radio communication system. 2 receiving section 173, a position recognizing section 176 for recognizing the position of the wireless terminal itself from the information received by the second receiving section 173, Using the information, configured to include a service known area recognizing section 178 whether the wireless terminal is present in the service area. Further, in order to accumulate information on the latest service area, the wireless terminal 171 receives at least information on a service area in which the first wireless communication system can be used via the second receiving unit 173. An area information receiving unit 172, a service area information confirming unit 175 for confirming whether information on the service area has been updated,
A service area information updating unit 174 for updating information on the service area stored in the service area information storing unit 177 is included.

Next, an operation example of the wireless terminal 171 will be described.

In the wireless terminal 171, the second receiving unit 173 receives the radio wave of the wireless base station of the second wireless communication system (step S191). The service area information confirmation unit 175 determines whether or not the information on the service area of the first wireless communication system has been updated (step S192). The service area information receiving unit 172 instructs the service area information receiving unit 172 to receive information about the service area.
, Information about a service area where the first wireless communication system can be used is received (step S19).
3).

Here, service area information confirmation section 175
As a method for recognizing whether or not the information on the service area has been updated, for example, when the information on the service area of the first wireless communication system is updated, the fact that the second wireless communication This is possible by notifying the wireless terminal via the system.

The service area information receiving section 172 is (second
When the service area information updating unit 174 receives the information on the service area (via the receiving unit 173 of the service area 173), the service area information updating unit 174 replaces the information on the service area stored in the service area information storing unit 177 with the newly received new information (step S17). S194).

The position recognizing unit 176 is connected to the second receiving unit 173.
Recognize the position (for example, north latitude and east longitude) of the wireless terminal 171 using the information received by the wireless terminal 171 (step S
195).

As a method of recognizing the position, for example, signals can be received from a plurality of radio base stations of the second radio communication system, and the position can be recognized from a time difference between these signals. In the case of this method, each radio base station broadcasts a radio base station identifier unique to the radio base station,
The same code is broadcast at the same time. The wireless terminal receives a wireless base station identifier and a code from a plurality of wireless base stations, obtains a positional relationship with each wireless base station by using a time lag when the code is received, and the wireless terminal has in advance. It is possible to confirm the position of the wireless terminal itself by using the position information of the existing wireless base station. Of course, as described above, it is also possible to recognize the position using the received electric field strength.

The service area information storage section 177 stores information on a service area in which the first wireless communication system can be used. The service area recognition section 178 stores the information on the service area and the radio terminal information. It is determined whether or not the wireless terminal is within the service area based on its own location information (step S19).
6). If the service area recognition unit 178 determines that the service area is outside the service area, the reception control unit 17
Notify 9. The reception control section 179 is the first reception section 18
0 to stop the operation of receiving the radio wave of the first wireless communication system.
80 stops the receiving operation (step S197).

On the other hand, when the service area recognizing section 178 recognizes that it is in the service area, it notifies the reception control section 179 to that effect. The reception control section 179 is the first
Is instructed to perform an operation of receiving radio waves of the first wireless communication system, and the first receiving unit 180 performs a receiving operation (step S198).

As described above, even when the service area where the wireless communication system can be used is small, the wireless terminal of the present invention does not perform unnecessary receiving operations outside this service area, so that the wireless terminal can be used as a spot. Power consumption can be reduced in a wireless communication system in which wireless base stations are arranged. When a wireless communication system with a narrow service area and a wireless communication system with a wide service area are used together, such as a hybrid system and a dual mode system, it is possible to perform reception control using a wireless communication system with a wide service area. However, it is possible to reduce the number of new functions added to the wireless terminal for this reception control. Furthermore, the wireless terminal can accumulate the latest information on the service area, thereby preventing a situation where the wireless communication system cannot be used even though the wireless terminal is located in a new service area, and the wireless terminal can be stored outside the service area. It is also possible to prevent the receiving operation from being performed at the changed location. In addition, since the wireless terminal receives information related to the service area of the wireless communication system having a small service area and updates of this information via the wireless communication system having a large service area, the wireless terminal receives the service area of the wireless communication system having a small service area. Even if the service area does not enter for a long time, it is possible to recognize this change in the service area, and it is possible to construct a wireless communication system that is easy for the user to use. Also, the wireless terminal receives the information after recognizing that the information has been updated without receiving the information on the service area itself to recognize whether the service area has been updated. It is possible to prevent the reception of information on service areas that are not available.

(Ninth Embodiment) Next, a ninth embodiment of the present invention will be described with reference to the block diagram of FIG. 18 and the flowchart of FIG. FIG. 18 is a block diagram illustrating an example of a wireless terminal according to the present embodiment, in which a first wireless communication system that provides a communication service to a wireless terminal in a geographically narrow range where a wireless base station is arranged in a spot manner. 2 shows a configuration example of a wireless terminal that can use a second wireless communication system that provides communication services to wireless terminals in a geographically wider range than the first wireless communication system. A flowchart illustrating an example of the operation of the wireless terminal according to the present embodiment is the same as that in FIG.

As shown in FIG. 18, the radio terminal 201 of the present embodiment transmits at least the radio wave transmitted by the radio base station of the first radio communication system that provides a high-speed radio communication service in a geographically narrow range. Receiving section 210 for receiving the information, a reception control section 208 for controlling the first receiving section 210, and a service area information storage section for storing information on a service area in which the first wireless communication system can be used. 205, a second radio communication system for providing a low-speed radio communication service to a radio terminal in a geographically wider area than the first radio communication system, for receiving radio waves transmitted by a radio base station of a second radio communication system. 2 receiving section 203, a position recognizing section 204 for recognizing the position of the wireless terminal itself from the information received by the second receiving section 203, Using the information, configured to include a service known area recognizing section 206 whether the wireless terminal is present in the service area. Further, the wireless terminal 201 receives at least information on a service area where the first wireless communication system can be used via the first receiving unit 210 in order to accumulate information on the latest service area. Area information receiving section 209, service area information confirming section 202 for confirming whether or not information relating to the service area has been updated using information received by second receiving section 203, and storing in service area information storing section 205 And a service area information update unit 207 for updating information on the service area being set.

Next, an operation example of the wireless terminal 201 will be described.

In the wireless terminal 201, the second receiving section 203 receives the radio wave of the wireless base station of the second wireless communication system (step S131). Position recognition unit 204
Uses the information received by the second receiving unit 203,
The position of the wireless terminal 210 itself (for example, north latitude and east longitude) is recognized (step S132).

As a method of recognizing the position, for example, signals can be received from a plurality of radio base stations of the second radio communication system, and the position can be recognized from the time difference. In the case of this method, each radio base station broadcasts a radio base station identifier unique to the radio base station,
The same code is broadcast at the same time. The wireless terminal receives a wireless base station identifier and a code from a plurality of wireless base stations, obtains a positional relationship with each wireless base station by using a time lag when the code is received, and the wireless terminal has in advance. It is possible to confirm the position of the wireless terminal itself by using the position information of the existing wireless base station. Of course, as described above, it is also possible to recognize the position using the received electric field strength.

The service area information storage unit 205 stores information on a service area where the first wireless communication system can be used. The service area recognition unit 206 stores the information on the service area and the wireless terminal. It is determined whether or not the wireless terminal is within the service area based on the own location information (step S13).
3). When the service area recognition unit 206 determines that the service area is outside the service area, the reception control unit 20
Notify 8. The reception control unit 208 is the first reception unit 21
0 to stop the operation of receiving the radio wave of the first wireless communication system.
10 stops the receiving operation (step S138).

On the other hand, when the service area recognizing section 206 recognizes that it is in the service area, it notifies the reception control section 208 to that effect. The reception control unit 208
Is instructed to perform an operation of receiving radio waves of the first wireless communication system, and the first receiving unit 210 performs a receiving operation (step S134).

The service area information confirming section 202 determines whether or not the information on the service area of the first wireless communication system has been updated using the information received by the second receiving section 203 (step S135). , If the service area information receiving unit 2
09 is instructed to receive information about the service area via the first receiving unit 210.

Here, service area information confirmation section 202
As a method for recognizing whether or not the information on the service area has been updated, for example, when the information on the service area of the first wireless communication system is updated, the fact that the second wireless communication This is possible by notifying the wireless terminal via the system.

In this way, when the service area information receiving section 209 receives (via the first receiving section 210) information on the latest service area for the first wireless communication system (step S136), The service area information update unit 207 replaces the information on the service area stored in the service area information storage unit 205 with the latest information (step S137).

As described above, even when the service area where the wireless communication system can be used is small, the wireless terminal of the present invention does not perform an unnecessary reception operation outside this service area. Power consumption can be reduced in a wireless communication system in which wireless base stations are arranged. When a wireless communication system with a narrow service area and a wireless communication system with a wide service area are used together, such as a hybrid system and a dual mode system, it is possible to perform reception control using a wireless communication system with a wide service area. However, it is possible to reduce the number of new functions added to the wireless terminal for this reception control. Furthermore, the wireless terminal can accumulate the latest information on the service area, thereby preventing a situation where the wireless communication system cannot be used even though the wireless terminal is located in a new service area, and the wireless terminal can be stored outside the service area. It is also possible to prevent the receiving operation from being performed at the changed location. Further, the wireless terminal receives the update of the information on the service area of the wireless communication system having a small service area via the wireless communication system having a large service area. Even if the user does not enter for a long time, the change of the service area can be recognized, and the information on the service area itself is received via the first wireless communication system capable of high-speed transmission. This information can be received instantaneously, and a wireless communication system that is easy for the user to use can be constructed. Furthermore, the wireless terminal receives the information itself after recognizing that the information has been updated, without receiving the information on the service area itself in order to recognize whether the service area has been updated. It is possible to prevent reception of information on service areas that are not performed.

The control and calculation processing of each embodiment can be realized as software.

The present invention is not limited to the above-described embodiments, but can be implemented with various modifications within the technical scope thereof.

[0134]

According to the present invention, it is determined whether or not the own device is in a service area where the wireless communication system can be used, based on the recognition result of the position of the own device and the information on the service area. Then, in response to this, the reception of radio waves of the wireless communication system and the control of the stop thereof are performed, so that the power consumption of the wireless terminal device of the wireless communication system in which the wireless base stations are arranged in a spot manner can be reduced. it can.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a wireless terminal according to a first embodiment of the present invention.

FIG. 2 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 3 is a diagram showing an example of an expression format of information relating to a service area;

FIG. 4 is a diagram illustrating a configuration example of a wireless terminal according to a second embodiment of the present invention;

FIG. 5 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 6 is a diagram showing a configuration example of a wireless terminal according to a third embodiment of the present invention.

FIG. 7 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 8 is a diagram showing a configuration example of a wireless terminal according to a fourth embodiment of the present invention.

FIG. 9 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 10 is a diagram showing a configuration example of a wireless terminal according to a fifth embodiment of the present invention.

FIG. 11 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 12 is a diagram showing a configuration example of a wireless terminal according to a sixth embodiment of the present invention.

FIG. 13 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 14 is a diagram showing a configuration example of a wireless terminal according to a seventh embodiment of the present invention.

FIG. 15 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 16 is a diagram showing a configuration example of a wireless terminal according to an eighth embodiment of the present invention.

FIG. 17 is a flowchart showing an operation example of the wireless terminal according to the embodiment;

FIG. 18 is a diagram illustrating a configuration example of a wireless terminal according to a ninth embodiment of the present invention.

FIG. 19 is a diagram illustrating a configuration example of a conventional wireless terminal.

FIG. 20 is a diagram showing a frame configuration and a superframe configuration of a conventional wireless communication system.

FIG. 21 is a diagram illustrating another configuration example of a conventional wireless terminal.

FIG. 22 is a diagram for explaining a conventional wireless terminal reception control method.

FIG. 23 is a view for explaining a conventional radio terminal reception control method.

[Explanation of symbols]

1,21,41,61,81,111,141,17
1,201 ... Wireless terminal 2,22,42,63,83,113,147,17
6,204 ... Position recognition unit 3,25,44,65,86,115,146,17
7, 205: service area information storage unit 4, 23, 43, 64, 84, 114, 148, 17
8, 206: service area recognition unit 5, 26, 45, 66, 87, 116, 149, 17
9, 208 ... reception control unit 6, 29, 48, 62, 67, 82, 90, 112, 1
19, 144, 150, 173, 180, 203, 21
0 ... receiving units 24, 46, 85, 117, 145, 174, 207 ...
Service area information updating unit 27, 49, 88, 120, 142, 175, 202 ...
Service area information confirmation unit 28, 47, 89, 118, 143, 172, 209 ...
Service area information receiver

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Mutsuri Serizawa 1F, Komukai Toshiba-cho, Saiwai-ku, Kawasaki-shi, Kanagawa F-term in the Toshiba R & D Center 5K033 AA04 DA01 DA19 DB12 DB18 DB25 EA07 EC01 EC03 5K067 AA43 BB03 BB04 BB12 BB36 CC22 DD19 EE24 EE56 FF03 GG11 GG21 HH22 HH23 JJ52 JJ53 JJ54 JJ56 JJ65 JJ66 KK05 KK15

Claims (6)

[Claims] 1. A wireless terminal device that can use a wireless communication system that provides a communication service by wireless, comprising: a position recognition unit that recognizes a position where the own device is located; and a service area that can use the wireless communication system. Service area accumulating means for accumulating information about the service area, information indicating the location of the own apparatus recognized by the position recognizing means, and information on the service area accumulated in the service area accumulating means. Service area recognizing means for recognizing whether or not the wireless communication system is available; and recognizing that the own apparatus is in a service area where the wireless communication system is available. Control is performed to receive radio waves of the wireless communication system when the A wireless terminal device, comprising: reception control means for performing control to stop reception of radio waves of the wireless communication system when it is recognized that the wireless communication system is outside a service area where the communication system can be used. 2. A means for receiving, from the wireless communication system, information on a service area in which the wireless communication system can be used, and a means for determining whether information on the service area from the wireless communication system has been updated. When it is determined that the information on the service area has been updated, the information on the service area stored in the service area storage unit is updated to the latest service area information from the wireless communication system. 2. The wireless terminal device according to claim 1, further comprising: means. 3. A first wireless communication system for providing a wireless communication service in a geographically narrow range, and a second wireless communication service for providing a wireless communication service in a geographically wider range than the first wireless communication system. A wireless terminal device capable of using a wireless communication system, wherein a position recognition unit that recognizes a position where the own device is located by using information transmitted by a wireless base station of the second wireless communication system; Service area storage means for storing information relating to a service area in which the first wireless communication system can be used; information indicating the location of the own device recognized by the position recognition means; and the information stored in the service area storage means. A service for recognizing whether or not the own device is in a service area where the first wireless communication system can be used, based on the information on the service area; Control means for receiving a radio wave of the first wireless communication system when the own device is recognized as being in a service area where the first wireless communication system can be used by the service area recognition means. Receiving control means for performing control for stopping reception of radio waves of the wireless communication system when the own device is recognized as being outside a service area where the first wireless communication system can be used. A wireless terminal device. 4. A means for receiving, from the first wireless communication system, information on a service area in which the first wireless communication system can be used, and updating information on the service area from the first wireless communication system. Means for determining whether or not the service area has been updated; and, when it is determined that the information on the service area has been updated, the information on the service area stored in the service area storage means is transmitted to the first wireless communication. 4. The wireless terminal device according to claim 3, further comprising: means for updating to the latest service area information from the system. 5. A means for receiving, from the second wireless communication system, information on a service area in which the first wireless communication system can be used, and updating information on the service area from the second wireless communication system. Means for determining whether or not the service area has been updated; and when it is determined that the information on the service area has been updated, information on the service area stored in the service area storage means is transmitted to the second wireless communication. 4. The wireless terminal device according to claim 3, further comprising: means for updating to the latest service area information from the system. 6. A reception control method for a wireless terminal device capable of using a wireless communication system for providing a communication service by wireless, comprising: recognizing a position where the own device is present; Recognizing whether or not the own device is in a service area in which the wireless communication system can be used, based on the information on the service area in which the wireless communication system can be used, stored in the own device. When the device recognizes that it is present in a service area where the wireless communication system can be used, it performs control to receive radio waves of the wireless communication system, and when the own device exists outside the service area where the wireless communication system can be used. A receiving control method for stopping reception of radio waves of the wireless communication system when the recognition is performed.