JP2000184438A - Mobile radio communication equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile radio communication equipment which can automatically and selectively set the parameter related to the control of radio communication correspondingly to the external environment and can always make the optimal radio control even when the external environment changes due to movement, etc. SOLUTION: In this mobile radio communication equipment provided with a speech path control section 8, a call control section 9, and a main body control section 3 which controls a system. The main body control section 3 incorporates a mobile radio control means 4 and a nonvolatile storing section 5, prestores plural parameter tables related to the radio communication control corresponding to the external environment in the storing section 5 and, at the time of searching a control channel (monitoring CCH), presumes the radio environment from the number of detected base stations and selectively sets an adaptive radio control parameter table to the surrounding environment which changes as the communication equipment moves.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile radio communication device, and more particularly to a mobile radio communication device capable of controlling radio communication more appropriately in response to an external environment.

[0002]

2. Description of the Related Art In a conventional mobile radio communication apparatus, parameters relating to radio control are set as fixed values in a nonvolatile storage device, and operation is performed based on the set values in all use environments. For example, "Initiate a handover when the value falls below a predetermined parameter value for a continuous predetermined second"
In such a control, the handover was activated based on a fixed set value.

FIG. 4 is a diagram for explaining a conventional parameter storage method. In a mobile radio communication device, parameters related to radio control are set as fixed values in a parameter table in a nonvolatile storage unit, and the radio control IC stores the information. Is controlled based on the communication.

[0004]

In the prior art,
The parameters related to wireless control are set as fixed values, so that an average performance of a certain level or more is obtained in all environments. However, since the surrounding environment changes with the movement, there is a problem that the wireless performance possessed cannot be fully exhibited in each environment.

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to automatically select and set parameters relating to control of wireless communication in accordance with an external environment, so that even when the external environment changes due to movement or the like, optimum wireless control is always achieved. It is an object of the present invention to provide a mobile radio communication device that can perform the above.

[0006]

In order to achieve the above object, the present invention provides a radio unit including an antenna, a communication path control unit connected to a speaker or a microphone, a call control unit connected to a user interface, and a system control. In the mobile radio communication device having a main body control unit, the main body control unit incorporates a mobile radio control unit and a nonvolatile storage unit, and the nonvolatile storage unit includes a plurality of units related to control of wireless communication corresponding to an external environment. A parameter table is stored in advance, and at the time of control channel search (CCH monitoring), a radio environment is estimated from the number of detected base stations, and a radio control parameter table suitable for a surrounding environment that changes according to movement is selected and set. A mobile wireless communication device characterized by having such a configuration is provided.

In the mobile radio communication apparatus according to the first aspect, when it is determined that the number of the detected base stations is relatively small, it is determined that the base station is located in a suburb, and communication with one base station can be maintained for a long time. In this way, if it is determined that the number of the detected base stations is relatively large, it is determined that the base station is located in the center of the city, handover is performed early, and a good wireless state can always be maintained. The wireless control parameter table is selectively set.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an apparatus configuration diagram showing an embodiment of a mobile radio communication apparatus according to the present invention, and is an example of a mobile phone including a simple type. FIG. 2 is a diagram showing an example of storing a plurality of wireless control parameters according to the present invention.

In FIG. 1, 1 is an antenna, 2 is a radio unit, 3 is a radio control unit, 4 is a radio control IC, 5 is a nonvolatile storage unit, 6 is a user interface IC, and 7 is an R
IC for F, 8 is a call control unit, 9 is a call control unit, 10 is a speaker, 11 is a microphone, 12 is an LCD, and 13 is a key.

Here, as shown in FIG. 2, a plurality of wireless control parameter tables 15a, 15b, and 15c corresponding to different ambient environmental conditions are stored in the nonvolatile storage unit 5.
Is stored in advance. At the time of control channel search (CCH monitoring), the wireless environment is estimated from the detected number of base stations, and a wireless control parameter table suitable for the surrounding environment that changes according to movement is selected and set from inside the non-volatile storage unit 5. Applied to wireless control ICs.

The parameters include the electric field strength of the radio wave and the number of calls interrupted. The parameter tables include, for example, those for the city center, for the suburbs, for the underground shopping malls, and for high-speed movement. Each table is suitable for the surrounding environment. Parameters are preset and built-in.

FIG. 3 is a diagram illustrating an example of a surrounding wireless environment. In the figure, 17 base stations are detected in the wireless environment area A, whereas only 5 base stations can be detected in the wireless environment area B. In such a case, it is determined that the area A is the center of the city, and the parameters are selected so that communication with the base station in a good wireless state is always possible. In addition, it is determined that the area B is a suburb, and parameters are selected so that communication with one base station is possible as long as possible. Such a selection process is performed by software.

For example, in an urban area where base stations are densely packed, handover is performed early so that communication with a base station having a good radio condition can be always performed. In a suburb where there are relatively few base stations, a large parameter value is set. If the communication with one base station can be maintained for a long time, it becomes easier to talk.

[0014]

As described above, according to the present invention,
A plurality of radio control parameter tables are registered in a nonvolatile storage device in advance, and a radio environment is estimated from the number of detected base stations when a control channel is searched (CCH monitor).
By selecting and setting a wireless control parameter table that adapts to the surrounding environment that changes according to movement, it is possible to optimize wireless control according to the usage environment when the external wireless environment of the mobile wireless communication mobile station changes. Good wireless communication becomes possible.

[Brief description of the drawings]

FIG. 1 is a device configuration diagram showing an embodiment of a mobile radio communication device of the present invention.

FIG. 2 is a diagram showing an example of storing a plurality of wireless control parameter tables according to the present invention.

FIG. 3 illustrates an example of a surrounding wireless environment.

FIG. 4 is a diagram showing an example in which a conventional parameter table is stored in a fixed manner.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 antenna 2 wireless unit 3 wireless control unit 4 wireless control IC 5 nonvolatile storage unit 6 user interface IC 7 RF IC 8 call unit control unit 9 call control unit 10 speaker 11 microphone 12 LCD 13 key 15 parameter table

Claims (2)

[Claims] 1. A mobile radio communication device comprising a radio unit including an antenna, a communication path control unit connected to a speaker or a microphone, a call control unit connected to a user interface, and a main unit control unit for system control. The unit incorporates mobile radio control means and a nonvolatile storage unit, and in the nonvolatile storage unit, a plurality of parameter tables relating to control of wireless communication corresponding to an external environment are stored in advance, and a control channel search (CCH A mobile radio communication device configured to estimate a radio environment from the detected number of base stations at the time of monitoring, and to select and set a radio control parameter table suitable for a surrounding environment that changes according to movement. 2. When it is determined that the number of detected base stations is relatively small, it is determined that the area is a suburban area. When it is determined that the number of detected base stations is relatively large, it is determined that the area is a city center. 2. The mobile radio communication apparatus according to claim 1, wherein a radio control parameter table suitable for the surrounding environment is selected and set so that a good radio state can be always maintained.