JP3563966B2 - Data communication standby method for wireless telephone terminals - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a data communication standby method for a wireless telephone terminal such as a PHS terminal that performs stable communication by appropriately switching a base station according to a reception level.
[0002]
[Prior art]
FIG. 3 is a schematic diagram showing a state of a PHS terminal that switches a base station at a conventional holding level. As shown in the figure, the PHS terminal 3 is connected to the base station 1 by a control channel in the service area 4 of the base station 1 and moves while waiting for an incoming call. Generally, the service area of a base station overlaps with the service areas of a plurality of other base stations, and the PHS terminal can connect to any one of the overlapping areas. FIG. 3 shows a state where the PHS terminal 3 moves in an area where the service area 4 of the base station 1 and the service area 5 of the base station 2 overlap.
[0003]
In general, a PHS terminal has a selection level set to select a base station to be connected from a plurality of base stations (selection level setting value), and each PHS terminal performs an open search to select a reception level (electric field strength). It connects to the base station with the highest reception level (base station 1 in the figure) that can be connected above the level setting value and waits for an incoming call (state A in FIG. 3).
[0004]
In addition, a holding level is set separately for each PHS terminal (holding level setting value). For example, when the PHS terminal 3 separates from the base station 1 and the receiving level decreases, the receiving level is set to the holding level. If the reception level is equal to or more than the value, the connection with the base station 1 is maintained (state B in FIG. 3). And waits for an incoming call (state C in FIG. 3).
[0005]
Further, the PHS terminal has a mode switching unit for a call mode / data communication mode, and can be used for a call and data communication, but does not switch the set values of the selection level and the holding level depending on the mode.
[0006]
[Problems to be solved by the invention]
However, as described above, in the conventional standby method, the current reception level is maintained even if another base station higher than the reception level currently being received can be received in an area where a plurality of service areas overlap. If it does not fall below the level setting value, the open search will not be performed and there will be no switching to another base station. When the terminal is used near the holding level setting value, it often moves after leaving the incoming call and leaves the service area. In this case, if a handover is performed, in the case of a normal voice call, the call only needs to be interrupted, but in the case of data communication, negotiation fails and the communication success rate decreases.
[0007]
The present invention has been made in view of the above points, and an object of the present invention is to provide a method of waiting for a data communication of a wireless telephone terminal, which eliminates the above problems, stabilizes a wide range, and improves a communication success rate. .
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is an open search means for searching a plurality of base stations, selecting an appropriate base station, and switching connection when a reception level of the wireless telephone terminal is lower than a holding level set value. And a data communication level setting means for setting a reception level at the time of data communication in the wireless telephone terminal, wherein the data communication level setting means comprises a mode switching means for switching between a call mode and a data communication mode. The reception level setting value set by the means is set higher than the holding level setting value, and when the mode switching means is activated, the reception level is compared with the reception level setting value set by the data communication level setting means, and the reception level is set to If the reception level is lower than the set value, select an appropriate base station by open search means and switch and connect And it features.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a processing flow of a data communication waiting method of a PHS terminal of the present invention. As shown in the figure, in the data communication standby method of the PHS terminal of the present invention, in addition to the conventional selection level setting value and holding level setting value, a data communication level setting value is provided, and each setting value is selected level setting value> data Open search is performed when the reception level is lower than the data communication level setting value when the communication mode / data communication mode is switched when the communication level setting value> holding level setting value is set. .
[0010]
First, the PHS terminal sequentially receives radio waves from a plurality of base stations and performs an open search (step ST1), and selects a base station whose reception level is higher than the set value of the selection level (step ST2). The highest connectable base station is selected from the selected base stations and a control channel is connected (step ST3).
[0011]
Normally, the reception level is periodically checked while waiting for an incoming call in this state (step ST4). It is checked whether or not there is a mode switch between the call mode and the data communication mode (step ST5). It is checked whether or not the reception level is equal to or higher than the hold level set value (step ST6). If the reception level is lower than the holding level set value, the base station repeats the standby state from step ST4 and performs the open search in step ST1 to select another base station and switch the connection.
[0012]
In step ST5, when there is a mode switch between the call mode and the data communication mode, it is checked whether or not the reception level is equal to or higher than the data communication level set value (step ST7). If the reception level is lower than the data communication level set value, the open search of step ST1 is performed to select another base station and switch connection.
[0013]
As described above, according to the embodiment of the present invention, the PHS terminal is provided with the data communication level setting values in addition to the selection level setting value and the holding level setting value, and sets each setting value as the selection level setting value> the data communication level. As shown in FIG. 2, when the PHS terminal 3 performs data communication by switching between the call mode and the data communication mode, the reception level is higher than the conventional holding level, since the setting value> the holding level setting value. , The base station 2 is switched to the base station 2 and connected if the reception level is higher (state B in FIG. 2). Therefore, since it can be used stably in a wide range (up to the state C in FIG. 2), the success rate of the data communication is also increased.
[0014]
Although the PHS terminal has been described as an example of the data communication standby method in the above embodiment, the present invention is not limited to the PHS terminal, but can be applied to a general wireless telephone terminal.
[0015]
【The invention's effect】
As described above, according to the present invention, the wireless telephone terminal is provided with the data communication level setting means for setting the reception level, the data communication level setting value is set higher than the holding level setting value, and the communication mode / data communication mode is set. When the switching mode switching means is activated, the reception level is compared with the data communication level setting value, and if the reception level is lower than the setting value, an appropriate base station is selected by the open search means and the switching connection means is provided. Therefore, the following excellent effects can be expected.
[0016]
When the wireless telephone terminal performs data communication by switching modes, the open search is performed at a reception level higher than the conventional holding level. Therefore, the data communication can be stably used in a wide range, and the success rate of data communication is also increased.
[Brief description of the drawings]
FIG. 1 is a diagram showing a processing flow of a data communication waiting method of a PHS terminal of the present invention.
FIG. 2 is a diagram illustrating a state of a PHS terminal provided with a data communication standby level.
FIG. 3 is a diagram illustrating a state of a PHS terminal that switches a base station at a conventional holding level.
[Explanation of symbols]
1 base station 2 base station 3 PHS terminal 4 service area 5 service area

Claims (1)

When the reception level of the wireless telephone terminal is lower than the holding level setting value, the wireless communication apparatus has an open search means for searching a plurality of base stations and selecting and connecting an appropriate base station, and a mode switching means for switching between a call mode and a data communication mode. In the data communication standby method of the telephone terminal,
The wireless telephone terminal is provided with data communication level setting means for setting a reception level at the time of data communication, a reception level setting value set by the data communication level setting means is set higher than the holding level setting value,
When the mode switching means is operated, the reception level is compared with the reception level set value set by the data communication level setting means, and if the reception level is lower than the reception level setting value, the open search means A data communication standby method for a wireless telephone terminal, wherein an appropriate base station is selected and switched and connected.

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