JP3196634B2 - Wireless mobile terminal - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio mobile terminal (hereinafter, referred to as a mobile terminal) used in a position information detection system.

[0002]

2. Description of the Related Art In a mobile communication system such as an automobile telephone, a mobile telephone, and a personal handy phone system (hereinafter, referred to as a PHS), a plurality of wireless zones constitute an entire area. Utilizing the feature that there is overlap, from the received electric field strength of the control signals of multiple base stations around the mobile terminal, the position of the mobile terminal existing in the area is detected with higher accuracy than the wireless zone unit, position information detection The system is, for example, Japanese Patent Publication No. 6-936.
No. 50 is known.

[0003]

However, in the above-mentioned conventional example, it is not possible to predict at what time the position management station requests the transmission of the position information to the mobile terminal. It is necessary to measure the received electric field strength of the control signal of the peripheral base station beforehand at the time, or to receive the control signal of the peripheral base station after the communication state is established.

The method in which the mobile terminal measures in advance the received electric field strength of the control signal of the peripheral base station at the time of standby or the like has a disadvantage that the power consumption of the mobile terminal is increased. In the method of receiving a control signal of a peripheral base station after a communication state is established, it is necessary to provide two systems of receiving units, one for receiving a communication signal and the other for receiving a control signal, as a receiving unit of a mobile terminal. There is a drawback that the terminal becomes larger, the power consumption increases, and the number of components increases.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and measures the reception electric field strength of a control signal of a peripheral base station immediately upon receiving a request for transmitting position information from a position management station to a mobile terminal. To provide a wireless mobile terminal capable of transmitting location information to a location management station.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, according to the present invention, after receiving a position information transmission request, a control signal of a base station present in the vicinity is received, and the base station included in the control signal is received. After storing position information comprising a pair of a station identification code and a received signal strength of the control signal in the storage unit, establish a communication state with the base station, and store the position information stored in the storage unit. It is configured to transmit information to a communication partner.

[0007] Thus, it is possible to transmit the position information to the position management station during standby or after establishing the communication state, without measuring the electric field strength of the control signal of the peripheral base station.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides an ID detecting section for detecting an identification code transmitted from each base station, an electric field strength measuring section for measuring a received electric field strength of each base station, A storage unit for storing one or more pairs of position information comprising the identification code of the base station and the received electric field strength of the control signal of the base station, and transmission for converting the position information into a transmission signal to the base station A signal generation unit, and after receiving a position information transmission request, receive a control signal of a base station present in the vicinity, and receive an identification code of the base station included in the control signal and the control signal. After storing the position information comprising a pair with the received electric field strength of the signal in the storage unit, establish a communication state with the base station, and transmit the position information stored in the storage unit to a communication partner. It has the action of:

When the mobile terminal receives a position information transmission request from the position management station, the mobile terminal detects the identification code of the neighboring base station and information on the received signal strength of the control signal and transmits the information to the position management station. Unnecessary power consumption of the terminal can be prevented, and the mobile terminal can have a longer battery life and a smaller size. In addition, the mobile terminal can provide the latest location information in response to the current location search request from the location management station.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG.
FIG. 2 is a block diagram illustrating the arrangement of a base station, mobile terminals, and a location management station of a location information detection system using HS.
FIG. 2 is a block diagram showing a configuration of the wireless mobile terminal according to the embodiment of the present invention.

In FIG. 1, 1 is a mobile terminal, 2a, 2
, are base stations 3a, 3b, 3c,... for registering a call and a calling area with the mobile terminal 1, and wireless zones of the base stations 2a to 2d. 5 is a control station for controlling line connection to the mobile terminal 1 in the paging area, and 8 is a position for transmitting and receiving to and from the mobile terminal 1 via the base stations 2a to 2d. It is a management station.

The base stations 2a, 2b, 2c,...
And telecommunication line facilities 6a, 6b, 6c,... 7a, 7b, 7c, ... are base stations 2a, 2b,
2c,... Are control signals periodically transmitted using a control channel in order to establish a call connection with the mobile terminal 1,
The information includes a unique identification code for each base station, information indicating the configuration of a control signal, an incoming call signal for a mobile terminal, a signal for notifying allocation of a communication channel to the mobile terminal, and the like.

The mobile terminal 1 is located in the general call area 4 managed by the control station 5 and registers the call area in the control station 5. Also, the wireless zones 3a, 3b, 3c,... Have overlaps, and the mobile terminal 1 has the base stations 2a, 2b, 2
are located at points where control signals 7a, 7b, 7c,. 2, reference numeral 20 denotes an antenna, 21 denotes a reception amplifier, 22 denotes a demodulation unit, 23 denotes an ID detection unit, 24 denotes an electric field strength measurement unit, 25 denotes a control unit, 26 denotes a storage unit, 27 denotes a transmission signal generation unit, and 28 denotes a transmission signal generation unit. The modulator 29 is a transmission amplifier.

The operation of the position information detecting system configured as described above will now be described with reference to the mobile terminal 1 and the base station 2a.
2b, 2c,... Will be described in detail with reference to FIG. In a standby state in which the mobile terminal 1 is waiting for the reception of a position information transmission request from the position management station 8, the nearest base station 2a receives the control signal 7a periodically transmitted on the control channel (FIG. 3). (A)).

When the location management station 8 requests the mobile terminal 1 for a base station information pair in order to determine the current location of the mobile terminal 1, the location management station 8 calls the mobile terminal 1. The mobile terminal 1 receives a call from the location management station 8 from the base station 2a in the calling area 4 via the line 30 and the control station 5 ((b) in FIG. 3). The mobile terminal 1 immediately receives the control signals 7a, 7b, 7c,... That the base stations 2a, 2b, 2c,. )).

The radio waves of each base station received by the antenna 20 are amplified by the receiving amplifier 21, converted to an intermediate frequency, and demodulated by the demodulation unit 22 into a baseband signal. The ID detector 23 controls the control signals 7a, 7b, 7c,... Of the base stations 2a, 2b, 2c,.
... The identification code in... Is detected. The electric field strength measurement unit 24
From the output of the receiving amplifier 21, the base stations 2a, 2b, 2c,.
.. Are measured. The control unit 25 stores the identification code output from the ID detection unit 23 and the information on the reception electric field intensity output from the electric field intensity measurement unit 24 as a pair of information (information pair) for each base station. To be stored. For each receivable base station, the information pair is stored in the storage unit 26 ((d) in FIG. 3).

Next, the mobile terminal 1 issues a link channel establishment request for requesting assignment of a communication channel to the base station 2a.
(E) in FIG. 3, and after the communication state with the location management station 8 is established, the control unit 25 causes the control unit 25 to select the base having the largest received field strength information from among the stored information pairs. One or a plurality of information pairs in order from the station
7 is output. The transmission signal generation unit 27 converts the input information into a prescribed baseband signal format and outputs it to the modulation unit 28.

The modulator 28 modulates the input baseband signal into a high-frequency signal, and the modulated high-frequency signal is power-amplified by the transmission amplifier 29 and transmitted to the base station 2a by the antenna 20 ((f in FIG. 3). )). The signal of the mobile terminal 1 received by the base station 2a is transmitted from the control station 5 to the location management station 8 via the line 30. The position management station 8 knows the position information of each base station (geographical information of the place where the base station is installed), and therefore, based on the identification code of the base station detected by the mobile terminal 1 and the information pair of the received electric field strength. , The current position of the mobile terminal 1 is specified.

As described above, according to the present embodiment, only when a call is made from location management station 8 to mobile terminal 1, mobile terminal 1 detects the information pair of base stations 2a to 2d, 8, the power consumption of the mobile terminal 1 can be reduced. Also, the mobile terminal 1 has a location management station 8
The latest location information can be provided in response to a current location search request from.

In the above description, an example has been described in which a PHS is used as a mobile communication system. However, the present invention can be similarly applied to other mobile communication systems.

[0021]

As described above, according to the present invention, the location management station calls the mobile terminal at a time when it is desired to grasp the current location of the mobile terminal, and the mobile terminal receives an incoming call from the location management station. By detecting the identification code and information on the received electric field strength of the control signal of the base station and transmitting the information to the location management station only at the time when the mobile terminal is used, unnecessary power consumption of the mobile terminal is prevented, the battery life of the mobile terminal is extended, and the size of the mobile terminal is reduced. The effect that conversion can be performed is obtained. In addition, there is an effect that the location management station can grasp the latest current location of the mobile terminal.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a position information detection system according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a mobile terminal according to the embodiment;

FIG. 3 is a signal flow chart of a radio section according to the embodiment of the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mobile terminal 2a-2d Base station 3a-3d Radio zone 4 Simultaneous call area 5 Control station 6a-6d Telecommunication line equipment 7a-7d Control signal 8 Location management station 20 Antenna 21 Receiving amplifier 22 Demodulation unit 23 ID detection unit 24 Electric field Intensity measurement unit 25 Control unit 26 Storage unit 27 Transmission signal generation unit 28 Modulation unit 29 Transmission amplifier 30 lines

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04Q ^7/ 00-7/38 H04B ⁷ /24-7/26 102

Claims (1)

(57) [Claims] 1. An ID detection unit for detecting an identification code transmitted from each base station; an electric field intensity measurement unit for measuring a received electric field intensity of each base station; and an identification code for one or more base stations. And a storage unit for storing one or more pairs of position information comprising reception electric field strength of a control signal of the base station, and a transmission signal generation unit for converting the position information into a transmission signal to the base station. After receiving the position information transmission request through the control channel, receiving a control signal of a base station present in the vicinity, the identification code of the base station included in the control signal, the received signal strength of the control signal and After storing the paired location information in the storage unit, a communication channel is established with the base station, and the location information stored in the storage unit is used for the communication.
A wireless mobile terminal for transmitting to a communication partner through a channel .