JP3107479B2 - Mobile communication device and mobile station device - Google Patents

Abstract

PURPOSE:To unnecessitate a useless notification and to simplify the processing in a mobile station by selecting the monitoring channel to be notified to a mobile station according to the kind of the mobile station by each of plural radio base stations. CONSTITUTION:A service area is composed of radio zones 31 to 34 covered by plural base stations 11 to 14 and plural frequency zones are used within the service area. Mobile stations 21 and 22 are classified into plural kinds of stations according to the number of usable frequency zone. Base stations 11 to 14 notify the monitoring channel of the peripheral zone to be monitored by the mobile stations 21 and 22, and the mobile stations 21 and 22 measure the reception level of the monitoring channel and report the level to the base station. In the base stations 11 to 14, the zone where the mobile stations 21 and 22 stay is discriminated based on the report and the control corresponding to the discrimination is performed. The mobile stations 21 and 23 are classified into plural kinds of stations according to the number of usable frequency zone, each of mobile stations 21 and 22 is made to store what kinds of stations the self station belongs to and the kind is notified to the base station. In the base station, the monitoring channel according to the kind is notified.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention is used for detecting the position of a mobile station in mobile communication. In particular, the present invention relates to a configuration for setting a monitoring channel to be monitored by a mobile station for position detection from a radio base station.

[0002]

2. Description of the Related Art In a mobile communication system having a small zone represented by an automobile telephone system, a frequency band of 800 M
Hz band is used, but recently 1.5GHz
As a result, it is possible to use such a plurality of frequency bands in the same service area. In this case, it is necessary that a conventional 800 MHz band mobile station and a 1.5 GHz band mobile station coexist. That is, there are a plurality of types of mobile stations depending on the number of usable frequency bands.

[0003]

Since the mobile station constantly moves and changes the zone in which the mobile station is located, it is necessary for the mobile station to monitor a monitoring channel from a peripheral zone and measure its reception level. For this reason, conventionally, a radio base station (hereinafter simply referred to as a “base station”) notifies a mobile station of a monitoring channel in a peripheral zone, and the mobile station measures a reception level of the monitoring channel and reports it to the base station. The station controlled the zone based on the information.

[0004] When there is a difference in the number of frequency bands that can be used by mobile stations, that is, when there are types of mobile stations, in the conventional method, the base station notifies the monitoring channel in a fixed manner. That is, the base station notifies the mobile station of all monitoring channels in the frequency band used in the service area, and the mobile station measures all reception levels of the notified monitoring channels and reports the measurement to the base station. I do.

[0005] However, depending on the mobile station, not all of the notified frequency bands can be used. It is useless for such a mobile station to be notified of the monitoring channels in all frequency bands. Further, since the number of monitoring channels to be notified increases, the signal length for notification increases, and the probability of occurrence of an error increases. Further, the mobile station needs to perform processing when notified of a monitoring channel of a frequency band that cannot be used by the mobile station.

SUMMARY OF THE INVENTION The present invention solves the above problems, and provides a mobile communication device which does not require useless notification and can simplify the processing in a mobile station, and a mobile radio used as the mobile station. The purpose is to do.

[0007]

A first aspect of the present invention is a mobile communication device, comprising: a plurality of radio base stations arranged in a service area where a plurality of frequency bands can be used; And a mobile station capable of communicating with, each of the plurality of radio base stations includes means for notifying a mobile station located in its own radio zone of a monitoring channel of a peripheral zone to be monitored by the mobile station, In a mobile communication apparatus including a means for receiving a monitoring channel notified from the notifying means and measuring a reception level of the monitoring channel, the mobile station determines its own type classified in advance according to the number of available frequency bands. And a means for notifying the radio base station of its type stored in the storage means. Each of the plurality of radio base stations communicates with the mobile station according to the type of the mobile station. Characterized in that it comprises a means for selecting the should do the monitoring channel.

[0008] The mobile station may further include means for notifying the measured reception level to the radio base station, and the radio base station may include means for controlling the zone in which the mobile station is located in accordance with the notification.

A second aspect of the present invention is a mobile station apparatus used in the mobile communication apparatus according to the first aspect, and means for storing its own type pre-classified according to the number of usable frequency bands, and this storage. Means for notifying the radio base station of its own type stored in the means for performing the operation.

[0010]

The service area is constituted by a wireless zone covered by a plurality of base stations, and a plurality of frequency bands are used in the service area. Mobile stations are classified into a plurality of types according to the number of usable frequency bands. The base station notifies a monitoring channel of a peripheral zone to be monitored by the mobile station, and the mobile station measures a reception level of the monitoring channel and reports the reception level to the base station. The base station determines the zone in which the mobile station is located based on the report, and performs control corresponding to the zone. Here, in the present invention, when the base station notifies the mobile station of the monitoring channel in the peripheral zone, the monitoring channel to be notified is changed for each type of mobile station classified according to the usable frequency band.

That is, mobile stations are classified into a plurality of types according to the number of usable frequency bands, each mobile station stores the type to which the mobile station belongs, and notifies the base station of the type. When the base station recognizes the type of the mobile station,
The monitoring channel corresponding to the type is notified.

Therefore, there is no waste of notifying a monitoring channel of a frequency band that cannot be used by the mobile station, and the processing of the mobile station for such a frequency band is not required, so that the processing in the mobile station is simplified.

[0013]

1 is a block diagram showing an overall configuration of a mobile communication apparatus according to an embodiment of the present invention. FIG. 2 is a block diagram showing an example of a base station, and FIG. 3 is a block diagram showing an example of a mobile station.

This mobile communication device includes a plurality of base stations 1 arranged in a service area where a plurality of frequency bands can be used.
1 to 14 and mobile stations 21 and 2 capable of communicating with individual base stations.
2 is provided. The base stations 11 to 14 are connected to the line control station 10. Each of the base stations 11 to 14 is a wireless zone 31
The communication can be performed with the mobile stations within. Base station 1
Monitoring channels 41 to 44 are allocated to 1 to 14, respectively, and the mobile stations 21 and 22 monitor this.

Each of the base stations 11 to 14 includes a line connection device 201 connected to the line control station 10, a transmitter 202 for transmitting an information signal and a control signal to the mobile station,
A receiver 203 receives an information signal and a control signal from a mobile station, and a control unit 204 receives control information from the mobile station and generates control information to be sent to the mobile station. The control unit 204 can also notify the mobile station located in the wireless zone of the own station via the receiver 203 of a monitoring channel of a peripheral zone to be monitored by the mobile station.

The mobile station includes a transceiver 301 for transmitting and receiving information signals and control signals to and from the base station. As means for receiving the monitoring channels notified from the base station and measuring the reception levels, Receive level measurement circuit 3
02, a frequency synthesizer 303 for switching the transmission / reception frequency of the transceiver 301, and a control unit 3 for receiving a control signal from the base station and controlling the reception level measurement circuit 302.
04.

Here, the feature of this embodiment is that the mobile station is provided with a type storage memory 305 as means for storing its own type classified in advance according to the number of usable frequency bands, and the control unit 304 It is possible to notify the base station of its own type stored in the type storage memory 305 via the transceiver 301, and the base station should monitor the mobile station according to the type of mobile station. The monitoring channel table 205 is provided as a means for selecting a channel.

FIG. 4 shows the operation flow of the base station and the mobile station. FIGS. 5 and 6 show the type storage memory 305, respectively.
7 shows an example of a signal from the mobile station to the base station, and FIG. 8 shows an example of a signal between the base stations. The operation will be described with reference to these figures and FIG. Here, the base station 11,
The transmitters 12 and 13 operate in the frequency band f and the base station 14
Is assumed to operate in frequency band g. The mobile station 21 operates only in the frequency band f, and the mobile station 22 can operate in any of the frequency bands f and g. Further, it is assumed that both the mobile stations 21 and 22 are located in the wireless zone 31 of the base station 11.

The mobile stations 21 and 22 store types classified according to the number of usable frequency bands in the type storage memory 305 in advance. In addition, notification information corresponding to the type of mobile station is stored in the monitoring channel table 205 of each base station.

When the mobile station 21 or 22 makes a call or other communication connection request, the control unit 304 reads the type of the mobile station from the type storage memory 305 and transmits it from the transceiver 301 to the base station. After the communication connection,
The control unit 204 of the base station reads a monitor channel of the peripheral zone corresponding to the mobile station from the monitor channel table 205 so that the mobile station can detect when the mobile station moves and changes the zone in which the mobile station is located. Notify the mobile station via 202. Since the mobile station notifies its type when a communication connection request is issued, the base station notifies the mobile station of information corresponding to the type.

For example, since the type of the mobile station 21 is “0” and only the frequency band f can be used, the base station 11
Reads the information corresponding to the type “0”, and
Notify. In this example, the monitoring channels 42 and 43 are notified. The mobile station 21 that has received the notification measures the reception levels of the monitoring channels 42 and 43 and the communication channel 51 of the visited zone, and reports the measured value to the base station 11. The base station 11 performs zone control on the mobile station 21 based on this report. When the mobile station 21 moves and the serving zone changes to the wireless zone 32, the base station 14 configuring the wireless zone 32 notifies the mobile station 21 of the monitoring channel of the surrounding zone. At this point, the base station 12 has not recognized the type of the mobile station 21. Therefore, when the serving zone changes from the wireless zone 31 to the wireless zone 31, the base station 11 notifies the base station 12 of the type of the mobile station 21. In this manner, the type of the mobile station 21 can be recognized by the base station 12 and information corresponding thereto can be notified.

The operation in the case of the mobile station 22 is similar,
Since both types of frequency bands f and g can be used (the type of mobile station is “1”), the base station 11 notifies the corresponding monitoring channels 42, 43 and 44. In the mobile station 22,
The reception level between the monitoring channels 42, 43, and 44 and the communication channel in the area where the communication is located is measured, and the result is reported to the base station 11.

In this way, waste is reduced as compared with the conventional technique, and the control burden on the mobile station is also reduced.

In the above embodiment, the case where the number of zones = 4, the number of frequency bands = 2, and the number of types of mobile stations = 2 has been described for the sake of simplicity. However, the present invention can be similarly applied to other cases.

[0025]

As described above, the mobile communication device of the present invention recognizes the type of the mobile station and notifies the monitoring channel in the peripheral zone in accordance with the type of the mobile station.
Further, the signal length can be kept short, and the probability of occurrence of an error can be reduced. Furthermore, in mobile stations,
There is no need to monitor the channels of the extra zones, and control is simplified.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an overall configuration of a mobile communication device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a base station.

FIG. 3 is a block diagram showing an example of a mobile station.

FIG. 4 is a diagram showing an operation flow of a base station and a mobile station.

FIG. 5 is a diagram showing an example of types stored in a mobile station.

FIG. 6 is a diagram showing an example of a monitor channel table stored in a base station.

FIG. 7 is a diagram showing an example of a signal from a mobile station to a base station.

FIG. 8 is a diagram showing an example of a signal between base stations.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Circuit control station 11-14 Base station 21, 22 Mobile station 31-34 Wireless zone 41-44 Monitoring channel 51 Communication channel 201 Line connection device 202 Transmitter 203 Receiver 204 Control unit 205 Monitoring channel table 301 Transmitter / receiver 302 Reception level Measurement circuit 303 Frequency synthesizer 304 Control unit 305 Type storage memory

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Keiichi Terao 2-10-1 Toranomon, Minato-ku, Tokyo Inside NTT Mobile Communication Network Co., Ltd. (56) References JP-A-6-237217 (JP) , A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/26 H04Q 7/00

Claims (3)

(57) [Claims] 1. A wireless communication system comprising: a plurality of radio base stations arranged in a service area in which a plurality of frequency bands can be used; and a mobile station capable of communicating with each of the radio base stations. Means for notifying a mobile station located within its own radio zone of a monitoring channel of a peripheral zone to be monitored by the mobile station, wherein the mobile station receives the monitoring channel notified from the notifying means, respectively. and a mobile communication apparatus including means for measuring the reception level, the mobile station includes means for storing its own kind thus pre classified into frequency bands that can be used, their stored in means for the storage Means for notifying the type to the radio base station; and each of the plurality of radio base stations includes means for selecting a monitoring channel to be notified to the mobile station according to the type of the mobile station. Mobile communication device, wherein the door. 2. The mobile communication device according to claim 1, wherein said plurality of frequency bands are an 800 MHz band and a 1.5 GHz band. In the mobile station apparatus comprising means for measuring the reception level to receive the notified monitored channel from 3. A base station, means for storing the own of the type thus previously classified into frequency bands that can be used Means for notifying the radio base station of its own type stored in the storing means.