JP2002300644A - Mobile communication terminal - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Mobile communication that allows a user to perform data communication in a good reception state by immediately and accurately notifying the user of a reception state that changes significantly according to a place. Provide a terminal. A terminal predicts a downlink data communication speed based on a reception state of a signal from a base station in a terminal, and notifies the base station of the predicted downlink data communication speed,
In a mobile communication terminal employing a cdma2000 1x-EV DO system, which is a data communication system in which a base station communicates data at the predicted downlink data communication speed, the predicted downlink data communication speed or the predicted downlink data communication speed is averaged over a predetermined period. The user is notified of the data communication speed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for predicting a downlink data communication rate on the terminal side based on a reception state of a signal from a base station in the terminal and notifying the predicted downlink data communication rate to the base station. The present invention relates to a mobile communication terminal adopting a data communication method in which a base station communicates data at a predicted downlink data communication speed.

[0002]

2. Description of the Related Art In recent years, as a next-generation high-speed wireless communication system,
cdma2000 1x-EV DO method has been developed. Cdma200 above
0 1x-EV DO system is a standardization of the HDR (High Data Rate) system, which is an extension of cdma2000 1x by Qualcomm.
CS0024 “cdma2000 High Rate Packet Data Air Inte
rface Specification ", which is currently being serviced by KDDI in Japan. The cdmaOne method (ARIB T-53 in Japan, EIA / TIA / IS-95 in North America, Korea, etc.)
Etc.) and expanded to support 3rd generation (3G) cdma
This is a method aimed at improving the communication speed by further specializing the 2000 1x method to data communication. Cdma2000 l
In x-EV DO, EV stands for Evolution, and DO stands for Data only.

In the cdma2000 1x-EV DO system, the base station switches the modulation scheme of data transmitted to the terminal based on information notifying the reception state received from the mobile communication terminal, so that the reception state of the terminal is changed. It is possible to use a high-speed communication rate with low error resilience when good, and a low-speed but high error resilience when reception condition is bad.

In the cdma2000 1x-EV DO system, the time is 1/60 in the downlink direction (direction from the base station to the mobile communication terminal).
Time-division multiplexing access, in which the communication is performed with only one mobile communication terminal within that time and communication with a plurality of mobile communication terminals is performed by switching the communication partner mobile communication terminal according to time during that time, TDMA; time division multip
lex access). Thus, data transmission can be always performed with the maximum power to each mobile communication terminal, and data communication performed between the mobile communication terminals can be performed at the highest communication speed.

[0005]

On the other hand, the above-mentioned cdma20
In the 1x-EV DO system, the data communication speed in the direction from the base station to the mobile communication terminal depends on the reception state (for example, received electric field strength, carrier-to-interference ratio = CIR) in the mobile communication terminal.
It has the characteristic that it changes greatly. For example, if the mobile communication terminal has the best reception condition, the communication speed
Data communication at 2.4 Mbps is possible, but when the receiving condition is poor, the data communication speed drops to about several tens of kbps. And the reception condition in the mobile communication terminal is bad,
If download of a relatively large amount of data is started in a situation where only a low downlink data communication rate can be obtained, the following problems occur.

First, since it takes a long time until the data download is completed, the user is bound by the time during that time, and it is not possible to provide an environment where a sufficient service can be provided. Second, the communication time becomes longer, and the communication cost becomes higher. Third, during download, a part of the CPU (Central Processing Unit) processing capacity is devoted to data communication processing, and the response to user operations such as key input becomes slow.

Fourth, the current consumption of a portable communication terminal having an RF unit is dominated by the current consumption of the RF unit, and the current consumption of the RF unit is longer than the data communication speed when the RF unit is activated. Therefore, performing long-time data communication at a low data communication speed consumes more current than performing a short time at a high data communication speed. Fifth, when receiving a service such as downloading moving image data and music data from the communication network to the portable communication terminal and simultaneously performing reproduction on the terminal (streaming reproduction of moving image and music), the predetermined value is set. Although the above downlink data communication speed is required, if the required downlink data communication speed cannot be obtained at this time, it is considered that effects such as deterioration of image quality and sound quality, stoppage of moving images, interruption of sound, and the like are considered. , Not enough service quality.

The present invention has been made in view of such circumstances, and provides a user with a good reception state by immediately and accurately notifying the user of a reception state that changes significantly depending on the place. It is an object of the present invention to provide a mobile communication terminal capable of performing data communication by using a mobile communication terminal.

[0009]

To achieve the above object, the present invention predicts a downlink data communication speed on a terminal side based on a reception state of a signal from a base station in the terminal, and comprises the steps of: A portable communication terminal adopting a data communication method in which the base station communicates data at the predicted downlink data communication rate by notifying the base station of a rate (DRC; Data Rate Control Bit in an embodiment described later) A portable communication terminal comprising: a notifying unit that notifies a user of the predicted downlink data communication speed or information based on the predicted downlink data communication speed.

Here, in the cdma2000 1x-EV DO system described above, the downlink data communication speed is simply determined by the instantaneous value of CIR (carrier-to-interference ratio) indicating the reception state as in the conventional cdmaOne system. Instead, it changes due to prediction or correction based on statistical data such as an error rate of past downlink data transmission. In CDMA, a communication system that is currently widespread,
As in cdma2000 1x-EV DO system, since the change in data communication speed depending on the location is not so remarkable, the need to immediately notify the user of the reception status etc. is low,
Also, the determination of the reception state and the like was made on the basis of instantaneous values such as Ec / Io (pilot signal strength versus total received signal strength) and CIR obtained from pilot signals received from the base station. On the other hand, in the cdma2000 1x-EV DO system, as described above, since the data communication speed varies significantly depending on the place, it is necessary to immediately notify the user of an extremely accurate data communication speed. For this reason, the present invention provides the user with a DRC that directly indicates an extremely accurate data communication rate obtained in consideration of prediction and correction based on statistical data such as an error rate of past downlink data transmission. By notifying the user, the user can know the correct data communication speed, easily find a place suitable for data communication at the start of data communication, and start data communication in an environment suitable for communication. It is possible to do. Since the above-mentioned DRC is a value derived from the predicted CIR, the derived DRC is also a value in the future (for example, 1/600 second ahead).

[0011] In the portable communication terminal, the notifying means may use, as the information based on the predicted downlink data communication speed, information obtained by averaging the predicted downlink data communication speed for each predetermined period. Is notified to the user. According to such a configuration, the value of the predicted downlink data communication rate that changes too quickly to be reflected on the display is averaged for each predetermined period suitable for being reflected on the display, and this averaged value is calculated. Notify the user of the data communication speed. As described above, the period for updating the change in the data communication speed is set to a period suitable for the user to accurately grasp the communication speed, and a value obtained by averaging the data communication speed during the period is notified to the user. As a result, the user can accurately grasp the state of data communication at appropriate intervals.

Further, the portable communication terminal divides the predicted downlink data communication speed into a plurality of levels, and sets a table in which a threshold value of each of the divided levels is set, the predicted downlink data communication speed or the predicted downlink data communication speed. Level extracting means for extracting the level corresponding to the communication rate obtained by averaging the speed for each predetermined period set in advance from the table, wherein the notifying means includes information based on the predicted downlink data communication rate. The user is notified of the extracted level. In this way, by notifying the user of the level, the user can intuitively judge the quality of the data communication environment as compared with the case of notifying the numerical value of the predicted downlink data communication speed.

[0013] Further, in the portable communication terminal, the table is prepared with hysteresis depending on whether the level rises or falls. This makes it possible to avoid a frequent change in the lighting range in a case where values that rise and fall near the threshold value before giving hysteresis are continuous. As a result, since the level does not change frequently, it is possible to reduce the power consumption required for redrawing the display and the like.

In the portable communication terminal, the notifying means may notify the predicted downlink data communication rate or information based on the predicted downlink data communication rate by voice. In this way, by notifying the downlink data communication speed by voice, the user can grasp the reception status without looking at the screen.

Further, in the portable communication terminal, the notifying means changes a sound ringing cycle in accordance with the predicted downlink data communication speed or the predicted downlink data communication speed. Thereby, the user can grasp the reception status without looking at the screen.

Further, in the portable communication terminal, the notifying means changes a blink cycle of the light emitting element according to the predicted downlink data communication speed or the predicted downlink data communication speed. As described above, by notifying the reception status based on the blinking cycle of the light emitting element, for example, in the case of a foldable portable communication terminal or the like, by disposing the light emitting element in a place where the light emitting element can be viewed even with the user closed, the user Can easily understand the reception state.

Further, in the portable communication terminal, the notifying means displays the predicted downlink data communication speed or information based on the predicted downlink data communication speed as a numerical value. As a result, the user can accurately know the reception state, and can find a place with a good reception state even a little.

In the portable communication terminal, the notifying means changes a lighting range of a level bar according to the predicted downlink data communication speed or information based on the predicted downlink data communication speed. This allows
Users can see the lighting area of this level bar,
It is possible to intuitively grasp the current data communication status.

In the above-mentioned portable communication terminal, the notifying means may be configured to output the information based on the predicted downlink data communication speed or the predicted downlink data communication speed for a predetermined period set only when a notification instruction is issued. Is notified to the user. As a result, it is possible to save power consumption due to arithmetic processing for normal display and the like, save a limited display area, and the like. In particular, cdma2000 1x-EV
In a mobile communication terminal adopting the DO method, the data communication speed frequently changes depending on the location in the reception state, and the display update speed is fast to accurately notify the user of the change. Therefore, the calculation and the redrawing of the liquid crystal screen must be repeatedly performed at an extremely short period, and the power consumption increases. Therefore, the display of the frequently changing downlink communication speed is performed only when the display is requested by the user, thereby minimizing the above-described calculation and the power consumption for redrawing the liquid crystal screen. It is possible to significantly reduce power consumption.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a portable communication terminal adopting the cdma2000 1x-EV DO system according to an embodiment of the present invention. As shown in FIG. 1, the mobile communication terminal according to the present embodiment includes an RF unit including an antenna 1, a duplexer 3, a demodulator 5, and a modulator 19, a decoder 7, and a predictor 1.
1, CIR-DRC converter 13, multiplexer (MU)
X; Multiplexer) 15, a CPU 9, a memory 21, a display unit 23 such as a liquid crystal display, and an operation unit 25 such as a keypad and a keyboard.
It has. Also, a personal computer (P) is used so that the portable communication terminal can be used as a wireless modem.
C) An external interface (for example, serial port, parallel port, USB, blue-tooth, infrared communication, 10base-T LAN, etc.) 27 with 29 is provided.

<< Outline of Operation of Portable Communication Terminal Using cdma2000 1x-EV DO System >> Next, an outline of operation of the cdma2000 1x-EV DO system for the portable communication terminal having the above configuration will be described. The downlink pilot signal from the base station received by the mobile communication terminal is demodulated by the demodulator 5 via the antenna 1 and the duplexer 3. At this time, the demodulator 5
Demodulates a multiplexed signal from a baseband received signal by a demodulation method corresponding to the modulation method of the received signal received from the base station. In this embodiment, Q
PSK (quadriphase phase shift keying), 8PSK
(8 phase shift keying), 16QAM (16 amplit
ude modulation).

The received data demodulated by the demodulator 5 is output to the decoder 7 and decoded by the decoder 7. That is, the spectrum-spread received multiplexed signal is spectrum-spread. Here, if there is received data (for example, a call signal from a call partner or data that is desired to be downloaded) assigned to the own station, the received data is output from the decoder 7 to the CPU 9. This received data is processed in the CPU 9 or
External P via U9 and external interface 27
It is sent to C etc. 29. Further, in the course of the decoding process, the decoder 7 calculates Ec / Io (pilot signal strength versus total received signal strength) and calculates CIR (carrier to interference ratio) based on the following equation (1). CIR = (Ec / lo) / (1-Ec / lo) ... (1)

The CIR determined based on the above equation is
The signal is output from the decoder 7 to the predictor 11, where the next reception slot timing (here, one slot is
The value of CIR at 1.66 ms = 1/600 second) is predicted. The method of prediction here is not particularly limited, but a method such as linear prediction is exemplified. In addition, the predictor 1
Information indicating how many CIRs should be predicted after 1 is included in various control signals transmitted from the base station when the power of the mobile communication terminal is turned on. Then, the predicted CIR obtained by the predictor 11 is output to the subsequent CIR-DRC converter 13.

The CIR-DRC converter 13 converts the predicted CIR into a DRC based on the CIR-DRC conversion table shown in FIG. The DRC is a maximum communication speed expected from the predicted CIR and receivable by the mobile communication terminal at a predetermined error rate or less. Here, as shown in FIG. 2, the CIR-DRC conversion table contains the reference CI
A DRC corresponding to R is defined. CIR-DRC
When the input predicted CIR is the reference CIR, the conversion unit 13 outputs the DRC corresponding to the reference CIR to the CPU 9.
Output to On the other hand, the predicted CI input from the predictor 11
If R is not the reference CIR, the input predicted C
Obtain the DRC corresponding to the reference CIR closest to the IR or the binary CI closest to the input predicted CIR
By interpolating from R, a DRC corresponding to the interpolated CIR is obtained. This makes it possible to acquire a DRC corresponding to each predicted CIR, and to notify a user of a more accurate reception state.

The DRC determined as described above is the CIR
-Output from the DRC converter 13 to the CPU 9. DRC
Is input, the CPU 9 determines whether there is transmission data generated in the mobile communication terminal or input from the external PC or the like 29 via the external interface 27. And if there is transmission data,
The CPU 9 outputs the transmission data to the multiplexer 15 together with the DRC described above. On the other hand, if there is no transmission data, the DIR input from CIR-DRC
The RC is output to a multiplexer (MUX) 15.

The DRC and transmission data output from the CPU 9 are multiplexed by the multiplexer 15, further encoded by the encoder 17, modulated by the modulator 19 by a specific modulation method (for example, QPSK), and 3 and transmitted to the base station via the antenna 1.
The base station determines, based on the DRC received from each mobile communication terminal, to which mobile communication terminal the next slot is to be used for transmission, and the communication speed (modulation speed) for the transmission.

<< First Embodiment >> Next, the operation of the portable communication terminal according to the first embodiment of the present invention will be described.
In the mobile communication terminal of the present invention, in addition to the data transmission / reception relating to the data communication speed performed between the base station and the communication mobile terminal, the data communication speed currently performed between the base station and the mobile communication terminal is displayed on the display unit. Then, the user is notified of the current data communication usage status. Hereinafter, the display processing of the data communication speed will be described.

First, the CPU 9 averages the DRC output from the CIR-DRC converter 13 every predetermined period.
That is, the DRC is input from the CIR-DRC converter 13 every 1/600 second. Since it is not effective to reflect this value in the display at any time, a predetermined period is set, the average of the DRC is calculated for each predetermined period, and this value is calculated as the downlink data communication speed (hereinafter simply referred to as the data communication speed). Do). For example, when the display is updated every 0.1 seconds, the average DRC is obtained by adding 60 DRCs and dividing this value by 60. Then, the average DRC is displayed as the current data communication speed in the data communication speed display area 231 shown in FIG. At this time, a fraction of 1 kbps unit or 10 kbps unit or less may be truncated and displayed. By repeating this process, the user can be notified of the data communication speed immediately. As a result, the user can find a suitable place in the reception state suitable for data communication by referring to the correct data communication speed.

<< Second Embodiment >> Next, the operation of the mobile communication terminal according to the second embodiment of the present invention will be described.
In the second embodiment, the above data communication speed is displayed as a level bar as shown in FIG. in this case,
A table as shown in FIG. 5 is stored in the memory 21 of the mobile communication terminal in advance, and the CPU 9 corresponds to the average DRC obtained by the same method as in the first embodiment based on this table. Determine the number of lighting bars. For example,
When the average DRCDx satisfies the relationship of Dr9>Dx> Dr8, the number of lighting bars corresponding to the average DRCDx is 8, and the CPU 9 lights the display range of eight level bars displayed on the display unit 23. As a result, as shown in FIG. 4, up to eight display areas from the left side of the level bar are lit, and the user can instantly grasp the current data communication status by looking at the lit area of the level bar. Can be.

In order to avoid the above-mentioned frequent updating of the lighting range of the level bar, the lighting range is increased.
Hysteresis may be given to the set value in the case of decreasing. For example, when a 10 kbps hysteresis is provided in the DRC, as shown in FIG. 6, when the lighting range shifts in the increasing direction, the lower limit threshold of the reference lighting range is set to 5 k.
The value obtained by adding bps is set as a new lower threshold value.
The value obtained by subtracting bps is used as a new lower threshold. This makes it possible to avoid a frequent change in the lighting range in the case where values that go up and down near the lower threshold before the hysteresis shown in FIG. 5 are continued. Note that the ratio of the above-mentioned hysteresis can be arbitrarily set.

<< Third Embodiment >> Next, the operation of the portable communication terminal according to the third embodiment of the present invention will be described.
In the present embodiment, the screen of the power saving mode in which the display of the data communication speed is omitted is displayed on the display unit 23 unless the user requests the display of the data communication speed. This makes it possible to significantly reduce power consumption.

FIG. 7 shows a display screen in the power saving mode. As described above, when the display request of the downlink data communication speed is not made from the user, the screen on which the display of the data communication speed is omitted is displayed on the display unit 23. In this state,
When a display request of the data communication speed is made by pressing a key set in advance by a user, selecting from a menu, or the like, the CPU 9 causes the above-described first and second data to be transmitted.
The average DRC is obtained by the same method as the embodiment of
Display based on this average DRC is performed. As a result, a screen as shown in FIG. Here, as in the second embodiment, it is of course possible to indicate the data communication speed by a level bar.

It is to be noted that the display of the data communication speed can be set so that the display is performed while the specific key is pressed, and the display is terminated when the specific key is released. It is also possible to set to return to the display screen of the power saving mode shown in FIG. 7 after displaying for a predetermined period after the key is pressed. As a result, it is possible to save power consumption due to arithmetic processing for normal display and the like, save a limited display area, and the like. In particular, cdma2000 1x-EV
In the mobile communication terminal adopting the DO method, as described above, since the data communication speed frequently changes depending on the location, the display update speed is fast in order to accurately notify the user of the change. Therefore, the calculation and the redrawing of the liquid crystal screen must be repeatedly performed at an extremely short period, and the power consumption increases. Therefore, by displaying the frequently changing data communication speed only when the display is requested by the user, it is possible to minimize the power consumption for the above-described calculation and the redrawing of the liquid crystal screen. This makes it possible to significantly reduce power consumption.

<< Fourth Embodiment >> Next, the operation of a portable communication terminal according to a fourth embodiment of the present invention will be described.
In the present embodiment, in addition to the display of the data communication speed described above, the display of the antenna bar indicating the current communication quality is also displayed.
This is performed based on the value of RC. In this case, a table as shown in FIG. 9 is stored in the memory 21 of the mobile communication terminal in advance, and the CPU 9 determines, based on this table, the average DRC obtained by the same method as in the first embodiment. Determine the number of antenna bars corresponding to. Then, the determined number of antenna bars is displayed on the antenna bar display unit 23 in FIG.
2 is displayed. When the number of antenna bars is determined, the number of antenna bars may be obtained from CIR instead of DRC. For example, the predicted CIR obtained by the predictor 11 is averaged in the same manner as the method of averaging the DRC in the first embodiment, and the number of antenna bars is determined from the table shown in FIG. 9 based on the average CIR. You may do so.

Instead of the above average DRC, the DRC is averaged based on the following equation (2) or (3), and the number of antenna bars is determined from the result and the table shown in FIG. It is also possible. That is, the CPU 9
Averages the value of the DRC input from the CIR-DRC converter 13 based on the following equation (2), for example, every second. DRC [average] = (1−μ) DRC [average one second before] + μ · DRC [current value] (2) In the above equation, μ is a time constant of averaging and can be arbitrarily determined. In the embodiment, it is 0.15.

Alternatively, the CPU 9 directly calculates the average DRC based on the time constant from the value every 1/600 second based on the following equation (3).
May be required. DRC [average] = (1−μ) DRC [average before 1/600 second] + μ · DRC [current value] (3) At this time, μ is, for example, 0.00027 (600 of 0.15 after second average).
Square root).

Further, instead of the DRC averaging based on the above equations (2) and (3), the following (4) and (5)
It is also possible to average the CIR based on the equation and determine the number of antenna bars from the result and the table shown in FIG. In averaging CIR, first, CI
R is converted from a logarithmic domain to a linear domain, and then averaging is performed. CIR [Average] = (1−μ) CIR [Average one second before] + μ · CIR [Current value] (linear area) (4) In the above equation, μ is a time constant of averaging, for example, 0.15 It is.

Instead of calculating the average for each second, the average of the CIR based on the time constant may be calculated directly from the value for each 1/600 second. CIR [Average] = (1−μ) CIR [Average before 1/600 second] + μ · CIR [Current value] (5) In the above expression, μ is, for example, 0.00027 (0.15 after average every second).
Is the 600th root of

The CPU 9 calculates the average DRC or the average CIR by any one of the above equations (2) to (5), and calculates the average DRC or the average CIR based on the calculation result and the table shown in FIG.
The number of antenna bars is determined, and the number is reflected in the antenna bar display area 232 of the display unit 23.

It is also possible to determine the data communication speed by using the value calculated based on the above equation (2) instead of the average DRC used in the first to third embodiments. is there. In this case, it is appropriate to use μ = about 0.01 in order to make the update speed faster than the above-described antenna bar display update speed. This is because the display of the data communication speed requires more immediacy than the above-described antenna bar display.

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments, and includes a design and the like without departing from the gist of the present invention. It is. For example, in addition to the display method described above, for example, the data communication speed is determined by changing the blinking cycle, color, and the like of a light emitting element such as an LED (Light-Emitting Diode) provided in a mobile communication terminal according to the data communication speed at that time. In this case, the user may be notified of the data communication speed. Similarly, the ringing period of the electronic sound can be changed according to the data communication speed. Also, it is possible to notify the current data communication speed at predetermined intervals by voice, not by display but by a synthesized voice or the like. As described above, by notifying the data communication speed by voice, the user can grasp the reception status at the place without looking at the screen, so that the convenience can be improved.

[0042]

As described above, according to the portable communication terminal of the present invention, by notifying the user of the predicted downlink data communication speed or information based on the predicted downlink data communication speed, Prior to the start of communication, the reception state can be accurately and immediately grasped, so that a place suitable for data communication can be easily found, and data communication can be started in an environment suitable for communication.

As a result, the communication time required for downloading can be shortened, and the communication cost can be reduced. In addition, since a part of processing capacity of a CPU (central processing unit) is devoted to data communication processing, inconvenience such as slow response to user operations such as key input can be solved. The effect is obtained. Further, since data communication can be performed at a data communication speed as high as possible, the effect of reducing current consumption can be obtained. Also,
Since data communication can always be performed in a suitable environment, even when receiving services such as streaming playback of moving images and music, the effects of reduced image quality and sound quality, stopped moving images, interrupted sound, etc. are eliminated. Thus, the effect that sufficient service quality can be obtained is obtained.

Further, according to the portable communication terminal of the present invention, the value of the predicted downlink data communication rate, which changes too fast to reflect on the display, is changed every predetermined period suitable for reflecting on the display. It averages and notifies the user of the averaged data communication speed. As described above, the period for updating the change in the data communication speed is set to a period suitable for the user to accurately grasp the communication speed, and a value obtained by averaging the data communication speed during the period is notified to the user. As a result, the user can accurately grasp the state of data communication at appropriate intervals.

Further, according to the portable communication terminal of the present invention, the predicted downlink data communication speed is divided into a plurality of levels, and a table in which the threshold value of each of the divided levels is set is provided. Level extracting means for extracting a level corresponding to the converted downlink data communication speed from the table, by notifying the user of the extracted level, when notifying the numerical value of the predicted downlink data communication speed, The effect is that the user can intuitively judge the quality of the data communication environment.

According to the portable communication terminal of the present invention, the table is created with hysteresis depending on whether the level rises or falls.
In the case where values that rise and fall near the threshold value before giving hysteresis are continuous, it is possible to prevent the lighting range from frequently changing. As a result, since the level does not change frequently, it is possible to reduce the power consumption required for redrawing the display and the like.

Also, according to the portable communication terminal of the present invention, since the predicted downlink data communication speed or information based on the predicted downlink data communication speed is notified by voice, the user can grasp the reception status without looking at the screen. And convenience can be improved.

Further, according to the portable communication terminal of the present invention, the user is notified of the predicted downlink data communication speed by changing the sound ringing cycle in accordance with the predicted downlink data communication speed or the predicted downlink data communication speed. Since the reception status can be grasped without looking at the screen, the convenience can be improved.

According to the portable communication terminal of the present invention, the predicted downlink data communication speed is notified by changing the blinking cycle of the light emitting element according to the predicted downlink data communication speed or the predicted downlink data communication speed. In the case of a foldable portable communication terminal or the like, by arranging the light emitting element in a place where it can be seen even when the light emitting element is closed, the user can easily grasp the reception state.

Further, according to the portable communication terminal of the present invention, since the predicted downlink data communication speed or the information based on the predicted downlink data communication speed is displayed as a numerical value, the user can know the receiving state accurately, However, it is possible to find a place with good reception conditions.

According to the portable communication terminal of the present invention, the lighting range of the level bar is changed according to the predicted downlink data communication speed or the information based on the predicted downlink data communication speed. The current data communication status can be grasped intuitively by looking at the lighting area.

Further, according to the portable communication terminal of the present invention, the notifying means is configured to perform the predicted downlink data communication speed or the predicted downlink data communication speed for a predetermined period set only when a notification instruction is issued. Is notified to the user, it is possible to save power consumption due to arithmetic processing for normal display, save a limited display area, and the like. In particular, in mobile communication terminals that use the cdma2000 1x-EV DO system, the data communication speed frequently changes depending on the location of the reception state, and the display update speed is also fast to accurately notify the user of the change. . Therefore, the calculation and the redrawing of the liquid crystal screen must be repeatedly performed at an extremely short period, and the power consumption increases. Therefore, the display of the frequently changing downlink communication speed is performed only when the display is requested by the user, thereby minimizing the above-described calculation and the power consumption for redrawing the liquid crystal screen. It is possible to significantly reduce power consumption.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a schematic configuration of a mobile communication terminal according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating an example of a CIR-DRC conversion table.

FIG. 3 is a diagram showing a display example of the mobile communication terminal according to the first embodiment of the present invention.

FIG. 4 is a diagram illustrating a display example of a mobile communication terminal according to a second embodiment of the present invention.

FIG. 5 is a diagram showing an example of a level bar table.

FIG. 6 is a diagram illustrating an example of a level bar table in a case where a hysteresis is given to a lower threshold.

FIG. 7 is a diagram illustrating an example of a normal standby display screen of a mobile communication terminal according to a third embodiment of the present invention.

FIG. 8 is a diagram illustrating a display example when a display request for a downlink data communication speed is made in the mobile communication terminal according to the third embodiment of the present invention.

FIG. 9 is a diagram illustrating an example of an antenna bar table according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 ... antenna, 3 ... shared device, 5 ... demodulator, 7 ... decoder,
9 CPU, 11 predictor, 13 CIR-DRC converter, 15 MUX (multiplexer), 17 encoder, 19 modulator, 21 memory, 23 display unit, 25
... operation unit, 27 ... external I / F (interface), 2
9 ... PC etc. 231: Data communication speed display area 23
2: Antenna bar display area

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K027 AA11 CC08 FF02 FF23 FF25 5K067 AA33 AA34 AA43 BB04 CC04 DD00 FF02 FF23 FF25 FF33 HH22 HH23

Claims (10)

[Claims] The terminal predicts a downlink data communication speed on the terminal side based on a reception state of a signal from a base station in the terminal, and notifies the base station of the predicted downlink data communication speed, so that the base station can A portable communication terminal adopting a data communication method for communicating data at a predicted downlink data communication rate, comprising: a notifying unit for notifying a user of the predicted downlink data communication rate or information based on the predicted downlink data communication rate. A mobile communication terminal characterized by the above-mentioned. 2. The notifying means, as information based on the predicted downlink data communication speed, notifies a user of information obtained by averaging the predicted downlink data communication speed for each predetermined period. The mobile communication terminal according to claim 1, wherein: 3. A table in which the predicted downlink data communication speed is divided into a plurality of levels, and a threshold value of each of the divided levels is set, and the predicted downlink data communication speed or the predicted downlink data communication speed is set in advance. Level extracting means for extracting the level corresponding to the communication rate averaged for each predetermined period from the table, wherein the notifying means includes the extracted information as information based on the predicted downlink data communication rate. The mobile communication terminal according to claim 1, wherein the level is notified to a user. 4. The portable communication terminal according to claim 3, wherein the table is created with hysteresis depending on whether the level rises or falls. 5. The apparatus according to claim 1, wherein the notifying unit notifies the predicted downlink data communication rate or information based on the predicted downlink data communication rate by voice. Mobile communication terminal. 6. The apparatus according to claim 1, wherein the notifying unit changes a sound ringing cycle in accordance with the predicted downlink data communication speed or the predicted downlink data communication speed. Mobile communication terminal as described. 7. The communication device according to claim 1, wherein the notifying unit changes a blinking period of the light emitting element according to the predicted downlink data communication speed or the predicted downlink data communication speed.
The mobile communication terminal according to claim 4. 8. The apparatus according to claim 1, wherein the notifying unit displays the predicted downlink data communication speed or information based on the predicted downlink data communication speed as a numerical value. Mobile communication terminal. 9. The lighting device according to claim 1, wherein the notifying unit changes a lighting range of a level bar according to the predicted downlink data communication speed or information based on the predicted downlink data communication speed. The mobile communication terminal according to any one of the above items. 10. The notification means sends the predicted downlink data communication rate or information based on the predicted downlink data communication rate to a user for a predetermined period set only when a notification instruction is issued to a user. The portable communication terminal according to any one of claims 1 to 9, wherein notification is provided.