JPH10313264A - Mobile communication terminal equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce power consumption of a DSP by allowing a CPU to set a multiple of a PLL built in the DSP in response to the communication service in the mobile communication terminal equipment so as to make an operating clock of the DSP variable. SOLUTION: The terminal equipment is provided with a conventional DSP 21 that incorporates a DSP built in PLL 22 operated by an operating clock in response to the communication service and with a CPU 24 to set the operating clock of the DSP 21 and the CPU 24 sets a PLL multiple N of the DSP built in PLL 22 in response to the communication service. Thus, the operating clock of the DSP is made variable so as to be set closer to higher operating clock frequency in each mode of the communication service.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication terminal used by a user to perform communication using wireless communication in mobile communication or mobile satellite communication.

[0002]

2. Description of the Related Art FIGS. 5 and 6 conceptually show a communication method between a mobile communication terminal and a base station in mobile communication and mobile satellite communication, respectively. The mobile communication terminal 1 directly communicates with the base station 2 using wireless communication. On the other hand, in mobile satellite communication, the mobile communication terminal 1 communicates with the base station 2 via a satellite 3 launched into orbit around the earth.

Generally, in the field of mobile communication or mobile satellite communication, various communication services such as a standby mode, a circuit switching communication mode, and a packet communication mode are provided as shown in FIG. Circuit-switched communication mode is
Furthermore, it can be classified into a voice communication mode, a low-speed data communication mode, a high-speed data communication mode, and the like.

[0004] In the mobile communication terminal 1, it is necessary to perform high-speed signal processing involving complicated arithmetic processing on various digital signals in order to perform communication. DSP (Digital Si
Gnl Processor (Digital Signal Processor).

FIG. 8 shows an operation clock of the DSP required to operate the DSP of the mobile communication terminal 1 in various modes of the communication service. The operation clock of the DSP required in each mode has a different value. In general, the operation mode of the standby mode is the smallest as shown in FIG. In the case of the mode, the highest value c is obtained. In the conventional mobile communication terminal 1, the maximum operation clock c required to support all modes targeted by the communication service is set as a fixed value. The operation clock required in each communication mode depends on the specification of the communication service and the programming of the DSP, but the former is largely controlled by the former.

[0006]

However, in the conventional mobile communication terminal, the operation clock of the DSP is fixedly set to the maximum operation clock required for all communication services. , The power consumption of the DSP is constant regardless of the communication service mode. On the other hand, the actually required operation clock of the DSP is minimum in the standby mode as shown in FIG. 8 and partially maximum in each mode such as the voice communication mode. Since the power consumption of the DSP before the mobile communication terminal changes according to the operation clock, the power corresponding to the shaded portion in FIG. 8 of the power consumption of the DSP is wasted. become. Therefore, considering that the time in the standby mode is sufficiently longer than the time in the other communication modes, the rate at which power is wasted in the DSP,
That is, the waste rate of the DSP power consumption is: (DSP power consumption waste rate) = (1−a / c) × 100
%, Which is considerably large.

As described above, in the conventional mobile communication terminal, the operation clock of the DSP is set to the maximum operation clock required to support all modes targeted by the communication service. However, there has been a problem that more power than is actually required is consumed, and the power consumption increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problem, and has a mobile communication terminal capable of changing the operating clock of a DSP in accordance with a communication service to reduce the power consumption of the DSP in a mobile communication terminal. The purpose is to obtain a communication terminal.

[0009]

A mobile communication terminal according to a first aspect of the present invention includes an antenna unit, a transceiver unit, and a user interface unit, and sets the transceiver unit by operating the user interface unit. A mode of a communication service can be selected, and the transceiver unit performs a necessary signal processing corresponding to each mode of the communication service, a digital signal processor, and an operation clock of the digital signal processor which can be varied in multiple stages. Means for setting an operation clock required in each mode of the communication service by approaching the operation clock from a higher frequency.

[0010] In the mobile communication terminal according to a second aspect of the present invention, the transceiver unit performs a necessary signal processing corresponding to each mode of the communication service, and an operation for operating the digital signal processor. Phase lock loop PLL (Phase Loc) for outputting a clock to the digital signal processor
k Loop), and a central processing unit for setting a phase lock loop multiplication factor for determining an operation clock necessary for performing signal processing corresponding to each mode of the communication service in the phase lock loop, the digital signal processor. Is variable in multiple stages, and the operation clock required in each mode of the communication service is set closer to the operation clock with higher frequency.

[0011] A mobile communication terminal according to a third aspect of the present invention is the mobile communication terminal according to the second aspect.
In the invention, the phase lock loop and / or the central processing unit is built in the digital signal processor.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. FIG. 1 is a block diagram of a mobile communication terminal according to Embodiment 1 of the present invention. In the figure, 1 is
It is a mobile communication terminal that performs wireless communication using mobile communication or mobile satellite communication, and includes three main parts: an antenna unit 10, a transceiver unit 20, and a user interface unit 30. The transceiver unit 20 includes a general-purpose DSP (digital signal processor) 21 for performing signal processing, and a DSP built-in PLL built in the DSP 21.
(Phase Lock Loop) 22, a DSP built-in PLL setting terminal 23 for setting the multiplication number of the DSP built-in PLL 22, a CPU (Central P-Loop) for managing the entire mobile communication terminal 1.
processor unit (central processing unit) 24. Reference numeral 31 denotes an LCD (liquid crystal display) for notifying the user of information, and reference numeral 32 denotes a KEY for the user to input operation information and set an operation mode of the transceiver unit 20 and the like.

FIG. 2 shows a PLL 22 with a built-in DSP shown in FIG.
FIG. 3 is a block diagram showing in detail a PLL multiplication number N is input from an external CPU to a DSP built-in PLL setting terminal 23, and a PLL input clock fi is input to the PLL input clock terminal 26 from outside the DSP 21. Thus, the DSP 21 is configured to operate with the operation clock having the frequency value fo = fi × N multiplied by N by the DSP built-in PLL 22. An output clock having this frequency value fo is output from the PLL output clock terminal 25. In general, the PLL multiplication number N is an integer multiple, 倍, and ４.
The setting can be made by a combination of multiple stages more than two stages such as double.

The operation of the above device will be described below. Signal processing required for each mode of the communication service in the mobile communication terminal 1 is performed by the DSP 21. The operation clock required by the DSP 21 for this signal processing differs depending on each mode of the communication service. When the user operates the KEY 32 to make a call request, or when the base station makes a call request, the CPU 24 sets the DSP built-in PLL setting terminal 23 to
The LL multiplication number N is set. Then, a frequency fo = fi × generated by multiplying the PLL input clock fi supplied from a signal source (not shown) by N by the DSP 22 with built-in DSP.
A PLL output clock having N is output to the DSP 21, and an appropriate operation clock corresponding to each mode is set.

Next, the algorithm of the PLL setting by the CPU 24 will be described with reference to FIGS. After power is supplied to the mobile communication terminal 1 in step S (hereinafter simply referred to as S) 1 in FIG. 3, the CPU 24 sets the operation clock of the DSP 21 to an operation clock corresponding to the standby mode in S2. Thereafter, in S3, the CPU 24 constantly monitors whether there is an outgoing call request from the user by operating the KEY 32, or whether there is an incoming call response notified from the base station 2 in a standby state. Operating clock of the DSP 21 according to each mode
5 is set to start communication. If there is no call request or call response, the operation of S3 is repeated until these are present. After the start of communication, the CPU 24 monitors in step S6 whether there is a call termination request from the user by operating the KEY 32 or a call termination request from the base station 2. When these are received, the communication is terminated and the DSP 21 The operation clock is set to an operation clock corresponding to the standby mode. KE from user
If there is no call termination request by the operation of Y32 or the call termination request from the base station 2, the operation of S6 is repeated until there is such a request.

Next, the power consumption of the DSP in the mobile communication terminal 1 will be described. As described above, in the mobile communication terminal 1 according to the present invention, the value of the PLL multiple N added to the DSP built-in PLL setting terminal 23 is changed by the CPU 24 so that the DSP required according to the communication service is changed. Is variable. D to be set
For example, as shown in FIG. 4, the operation clock of the SP becomes minimum in the standby mode and partially takes a maximum value in each mode such as the voice communication mode and the high-speed data communication mode. The operation clock actually set is set to be higher than the operation clock required in each mode, based on the operation clock at the time of standby. Since the number of PLL multiplications is several, the required operation clock does not always coincide with the actually set operation clock, and the operation clock of each mode is set to a higher frequency than the originally required value. Will be set.

For example, the operation clock c 'actually set for the operation clock c required in the voice communication mode is c'> c. As a result, the shaded portion in FIG. 4 of the power consumption of the DSP is wasted. However, considering that the standby time in FIG. 4 is sufficiently longer than the time in the other communication modes, the power consumption in the DSP can be reduced to almost negligible, and the power consumption in the conventional mobile communication terminal can be reduced. The power consumption of the DSP that has been used can be greatly reduced.

According to the present embodiment, the operation clock of the DSP is made variable in multiple stages, and the means for selecting the operation clock required in each mode of the communication service by approaching the operation clock with a higher frequency is conventionally used. Thus, the power consumption of the DSP, which has been consumed in the mobile communication terminal, can be minimized, the power consumption of the DSP in the mobile communication terminal can be significantly reduced, and the battery life of the mobile communication terminal can be extended.

Embodiment 2 Some general-purpose DSPs can change the operation clock by software inside the DSP instead of externally setting them. In this case, the DSP itself can have the role of the external CPU. . In this case, the circuit configuration is simplified, and the cost can be reduced.

[0020]

According to the present invention, the operation clock of the DSP is made variable in multiple stages, and the means for setting the operation clock required in each mode of the communication service by approaching the higher frequency from the higher frequency is conventionally used. DS consumed in
The power consumption of P can be minimized, the power consumption of the DSP in the mobile communication terminal can be greatly reduced, and the battery life of the mobile communication terminal can be extended.

Further, the PLL and / or CPU may be replaced by DS
By incorporating it in the P, the price and size of the mobile communication terminal can be reduced.

[Brief description of the drawings]

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

FIG. 2 is a block diagram showing in detail a PLL with a built-in DSP in FIG. 1;

FIG. 3 is a flowchart of a PLL setting program by a CPU according to Embodiment 1 of the present invention;

FIG. 4 is a diagram showing an example of a relationship between a DSP operation clock set in the mobile communication terminal according to the present invention and a DSP operation clock required in each mode in a communication service.

FIG. 5 is a diagram conceptually showing a usage form of a mobile communication terminal in the conventional and mobile communication systems of the present invention.

FIG. 6 is a diagram conceptually showing a usage form of a mobile communication terminal in the conventional and mobile satellite communication systems of the present invention.

FIG. 7 is a system diagram showing an example of a classification of a communication service in the related art and the application field of the present invention.

FIG. 8 shows D set in a conventional mobile communication terminal.
FIG. 4 is a diagram illustrating an example of a relationship between an operation clock of an SP and an operation clock of a DSP required in each mode in a communication service.

[Explanation of symbols]

1 mobile communication terminal, 2 base station, 3 satellites, 10 antenna section, 20 transceiver section, 21 DSP, 22
DSP built-in PLL, 23 DSP built-in PLL setting terminal, 24 CPU, 25 PLL output clock terminal, 2
6 PLL input clock terminal, 30 user interface unit, 31 LCD, 32 KEY.

Claims (3)

[Claims] An antenna unit, a transceiver unit, and a user unit
An interface unit, wherein the transceiver unit can be set by operating the user interface unit to select a communication service mode, wherein the transceiver unit corresponds to each mode of the communication service. A digital signal processor for performing necessary signal processing; a means for making the operation clock of the digital signal processor variable in multiple stages, and setting the operation clock required in each mode of the communication service closer to a higher frequency from a higher frequency; A mobile communication terminal comprising: 2. An antenna unit, a transceiver unit and a user unit.
An interface unit, wherein the transceiver unit can be set by operating the user interface unit to select a communication service mode, wherein the transceiver unit corresponds to each mode of the communication service. A digital signal processor for performing necessary signal processing, a phase lock loop for outputting an operation clock for operating the digital signal processor to the digital signal processor, and a signal processing corresponding to each mode of the communication service. A central processing unit for setting a phase-lock loop multiplication factor that determines a required operation clock to the phase-lock loop, wherein the operation clock of the digital signal processor is made variable in multiple stages, and required in each mode of the communication service. Operation clock Mobile communication terminal characterized by being configured to set closer from high frequencies. 3. The mobile communication terminal according to claim 2, wherein the phase lock loop and / or the central processing unit is built in the digital signal processor.