JP2003258703A - Signal processing device and communication device equipped with this signal processing device - Google Patents

Abstract

(57) [Problem] To provide smooth and economical communication in an environment where a plurality of mobile communication services can be used simultaneously. An instruction memory stores a communication program, and an instruction memory stores a standby program. The control register 111 controls the selector 103 to output the system 1 communication program or the system 1 standby program from the instruction memories 101 and 102 to the CPU 105, and also stores the system 2 communication program or the system 2 standby program in the instruction memory 101 The selector 104 is controlled so as to output from the CPU 102 to the CPU 106. The switch 118 is off when the standby program is stored in the instruction memory 101 and a call and an incoming call are waiting.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a signal processing device which can be smoothly and economically used between a plurality of systems in an environment where a plurality of mobile communication systems coexist, and a communication provided with the signal processing device. Regarding the device.

[0002]

2. Description of the Related Art UMTS (Universal Mob)
ile Telecommunication Sys
The third generation mobile communication system (IM) represented by
(T-2000) service is about to start soon in various parts of the world. Considering the case of coexistence with an existing second generation mobile communication system, a multimode type in which both the third generation mobile communication system and the second generation mobile communication services can be used by one terminal such as a mobile phone Mobile communication terminals are desirable for users. At this time, if multiple mobile communication services can be used simultaneously,
Services with good communication quality such as sound quality and data transmission speed,
It is desirable that it can be automatically selected and used. In this case, considering that the user uses the terminal while moving, it is necessary to smoothly perform communication between the third generation mobile communication system and the second generation mobile communication system.

Conventionally, as a signal processing apparatus and a communication apparatus equipped with this signal processing apparatus, Japanese Patent Laid-Open No. 2001-4556 has been used.
Some are disclosed in Japanese Patent No. Japanese Patent Laid-Open No. 2001-
Japanese Patent No. 45566 discloses a software module library which holds a variable communication means capable of changing a modulation / demodulation method and a carrier frequency of a radio signal to be transmitted / received by software and a software module usable for its control for each of a plurality of types of mobile communication services. A mobile communication terminal including the above is disclosed. This mobile communication terminal has a communication control unit with a built-in microcomputer. The software module held in the RAM connected to this mobile communication terminal is transferred from the software module corresponding to the mobile communication service that was initially used. The mobile communication service to be used is switched by rewriting the software module corresponding to the handover destination mobile communication service.

[0004]

However, since the conventional signal processing device and the communication device equipped with this signal processing device need to rewrite the software held in the RAM at the time of handover, it is necessary to rewrite the software. There is a problem that the communication is interrupted.

The present invention has been made in view of the above points, and is provided with an economical signal processing apparatus and a signal processing apparatus which can smoothly perform a handover in an environment in which a plurality of mobile communication services can be simultaneously used. It is an object of the present invention to provide a communication device.

[0006]

A signal processing apparatus according to the present invention comprises a first storage means for storing a standby program and a communication program of a first communication system, and a communication system different from the first communication system. Second storage means for storing a standby program and a communication program of a certain second communication system, first processing means for processing the program of the first communication system, and processing the program of the second communication system And a control means for controlling an output from the first storage means or the second storage means to the first processing means or the second processing means. take.

According to this configuration, while processing the communication program of the communication system, it is possible to perform the processing of the standby program of the different communication system which subsequently performs communication. Therefore, when the different communication systems are used, smooth processing is possible. Can be handed over.

A signal processing apparatus of the present invention is a second communication system which is a communication system different from the first processing means for processing the standby program and the communication program of the first communication system and the first communication system. Second processing means for processing the standby program and the communication program, first storage means for storing the standby program of the first communication system or the second communication system, the first communication system or the Second storage means for storing a communication program of the second communication system;
The standby program stored in the first storage means and the communication program stored in the second storage means are switched for each communication system and output to the first processing means or the second processing means. Selection means to
The configuration including is adopted.

According to this structure, while executing the processing of the standby program stored in the first storage means,
Since the communication program is stored in the second storage means, the handover can be smoothly performed.

In the signal processing apparatus of the present invention, the first storage means has a capacity smaller than that of the second storage means.

According to this structure, since the standby program is stored in the storage means having a small capacity, the storage means can be downsized and the cost can be reduced.

The signal processing apparatus of the present invention is arranged between the power supply means for supplying power to the first storage means and the second storage means, and between the power supply means and the second storage means. When the incoming call or the outgoing call is detected, the second
And a switching means for starting the supply of electric power to the storage means.

According to this structure, since the power supply to the second storage means in which the standby program is not stored is stopped, the power consumption can be reduced.

In the signal processing device of the present invention, power supply means for supplying power to the first processing means and the second processing means, the power supply means, the first processing means and the power supply means. And the second processing means,
A switch for starting the supply of power to a unit other than the first processing unit or the second processing unit that processes the standby program of the first communication system or the second communication system when an incoming call or an outgoing call is detected. And a configuration including the means.

According to this structure, since the power supply to the processing means other than the processing means for processing the standby program is stopped, the power consumption can be reduced.

The communication device of the present invention has a configuration including any one of the above signal processing devices.

According to this structure, since communication is performed by using programs relating to different communication systems stored in a plurality of storage means, it is possible to provide a communication device capable of performing smooth communication.

The signal processing method of the present invention comprises a first processing step for processing the standby program and the communication program of the first communication system, and a second processing step for processing the standby program and the communication program of the second communication system. A first storing step for storing the standby program, a second storing step for storing the communication program,
The standby program stored in the first storing step and the communication program stored in the second storing step are processed by the first processing step or the second processing step for each communication system. And a selection step of switching.

According to this method, while executing the processing of the standby program stored in the first storing step,
Since the communication program is stored in the second storing step,
Communication can be performed smoothly.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention has at least two storage units and a processing unit, and stores a communication program of a system in communication and a standby program of a handover destination system in different storage units, Communication programs or standby programs stored in each storage unit
That is, it is switched for each communication system and processed by the processing unit.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the embodiment of the present invention, a first mobile communication system (hereinafter referred to as “system 1”), which is a UNTS communication system, and GSM.
(Global System of Mobile
A case will be described where handover is performed between the second mobile communication systems (hereinafter referred to as “system 2”), which are communication system communication systems.

(First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

1 and 2 are block diagrams showing the configuration of a signal processing device, FIG. 3 is a schematic diagram of state transition of a communication device,
FIG. 4 is a diagram showing the structure of the program, and FIGS. 5 and 6 are
It is a flowchart of operation | movement of a signal processing apparatus.

The signal processing device 100 includes an instruction memory 10
1, 102, selectors 103, 104, CPU 105,
106, data memories 107 and 108, ASIC (ap
application specific interg
rate circuit 109, 110, control register 111, system bus 112, CPU 113, instruction memory 114, data memory 115, memory 116,
It is mainly composed of a power supply circuit 117 and switches 118 and 119.

The instruction memory 101 as the first storage means
The instruction memory 102 as the second storage means stores the program of the communication system called from the memory 116 and outputs it to the CPUs 105 and 106. The instruction memory 102 has a larger storage capacity than the instruction memory 101,
The instruction memory 102 stores a communication program, and the instruction memory 101 stores a standby program.

The selector 103 selects the instruction memory 101 or the instruction memory 102 based on the control signal from the control register 111, and selects the selected instruction memory 10
The programs stored in Nos. 1 and 102 are stored in the CPU 105.
Output to. When the instruction memory 101 stores the system 1 standby program, the selector 103
The system 1 standby program is output from the instruction memory 101 to the CPU 105, and the system 1 is stored in the instruction memory 102.
When the communication program is stored, the system 1 communication program is output from the instruction memory 102 to the CPU 105.

On the other hand, the selector 104 includes the control register 1
The instruction memory 101 or the instruction memory 102 is selected based on the control signal from the CPU 11, and the programs stored in the selected instruction memories 101 and 102 are stored in the CPU 1.
Output to 06. The selector 104 is the instruction memory 101.
If the system 2 standby program is stored in the system 2, the system 2 standby program is stored in the instruction memory 101.
From the instruction memory 102 to the CPU 106 when the system 2 communication program is stored in the instruction memory 102.
Output to. The communication program and the standby program will be described later.

The CPUs 105 and 106 include the instruction memory 10
Standby program and instruction memory 10 stored in 1
2 based on the communication program stored in ASIC1
09 and 110 or the data memories 107 and 108, and performs signal processing for communication such as synchronization channel decoding processing. Also, CPUs 105 and 10
6 supplies an address to the data memories 107 and 108, measures the reception intensity, and outputs the measurement result to the data memories 107 and 108. Data memory 1
Reference numerals 07 and 108 are for reading or writing data in accordance with the addresses supplied from the CPUs 105 and 106, and store data of whether or not there is an incoming call or an outgoing call, and also store the reception intensity measured by the CPUs 105 and 106. To do.

ASICs 109 and 110 as processing means
Receives data from the CPU 105, 106 or a high-frequency transceiver (not shown), performs signal processing for communication such as synchronization channel decoding processing and reception intensity measurement processing, and outputs the data to the CPU 105, 106 or high-frequency transceiver. That is, the ASIC 109 receives data from the CPU 105, performs signal processing for transmission of the system 1, outputs the transmission data to the high frequency transmission / reception unit, receives a reception signal from the high frequency transmission / reception unit, and receives the reception signal of the system 1. And performs signal processing for output to the CPU 105. The ASIC 110, which is a processing unit, includes the CPU 10
6 receives the data, performs signal processing for the transmission of the system 2, outputs the transmission data to the high frequency transmission / reception unit, receives a reception signal from the high frequency transmission / reception unit, and performs signal processing for the reception of the system 2. And outputs it to the CPU 106. Further, the ASICs 109 and 110 receive the received signal from the high frequency transmitting / receiving unit at the time of measuring the reception intensity, calculate the data necessary for the reception intensity measurement processing, and output the calculation result to the CPUs 105 and 106.

The control register 111 is the selector 10 written from the CPU 113 via the system bus 112.
The control data of 3 and 104 are stored, and the stored control data is supplied to the selectors 103 and 104 as a control signal.
The system bus 112 includes a CPU 113 and an instruction memory 11
4. The data memory 115 and the memory 116 are connected to perform signal transmission between the control register 111 and the data memory 115 and signal transmission between the memory 116 and the instruction memories 101 and 102.

The CPU 113 controls the signal processing device and the entire mobile communication terminal device in accordance with the instruction supplied from the instruction memory 114, and the data memory 115.
The address is supplied to the data memory 107, 108 through the system bus 112 to read the data of the incoming call or the outgoing call stored in the data memory 107, 108, and the data is stored in the data memory 107, 108. The received reception strength data is read and the reception strengths of the two are compared. In addition, the CPU 113 uses the memory 11
The program stored in 6 is the instruction memory 101, 1
02, and the data stored in the data memories 107 and 108 is transferred to the CPU 11 via the system bus 112.
3 or the data stored in the data memory 115 is transferred to the data memory 115,
108 or the control register 111, and after processing the data read from the data memory 115, the data is output to the data memory 115.

The instruction memory 114 stores a control program for the entire apparatus, and the CPU 11 stores the control program based on the control program.
3 and the like, the program stored in the memory 116 is input and stored via the system bus 112, and the stored program is output to the CPU 113. The data memory 115 stores data to be input / output to / from the CPU 113 or the like according to an address supplied from the CPU 113. The memory 116 as a storage unit stores the system 1 communication program, the system 2 communication program, the system 1 standby program, and the system 2 standby program, and outputs each program to the instruction memories 101 and 102 in accordance with the instruction of the instruction memory 114.
Further, the memory 116 includes the CPUs 105 and 106 and the CP.
It stores a program for operating U113. The memory 116 is composed of a flash ROM or the like, and the stored contents are retained even when the power is turned off.

The power supply circuit 117 supplies power to the entire mobile communication terminal device. The switch 119 has a power supply circuit 117.
Is provided on the power supply line between the command memory 101 and the instruction memory 101, and the power supply line is opened and closed. Switch 118
It is provided on the power supply line between the power supply circuit 117 and the instruction memory 102, and opens and closes the power supply line.

Next, the configuration of the CPU 105 will be described with reference to FIG. The CPU 105 is mainly composed of an instruction register 201, an instruction decoder 202, a bus 203, an arithmetic unit 204 and a data memory address register 205.
The instruction register 201 holds the instruction received via the selector 104. The instruction decoder 202 decodes the instruction received from the instruction register 201 and outputs various control signals. The bus 203 includes a data memory 107,
Data transfer is performed between the ASIC 109, the arithmetic unit 204, and the data memory address register 205. Arithmetic unit 2
04 performs various calculations on the data received via the bus 203. Data memory address register 205
Supplies an address to the data memory 107.

Next, regarding the state transition when the mobile communication terminal performs handover between different communication systems,
This will be described with reference to FIG. Here, handover refers to switching of radio channels between base station devices of different communication systems. FIG. 3 shows state transitions in an environment in which the system 1 and the system 2 coexist. When the power is turned on from the power-off state 301, the system 1 standby program is called from the memory 116 and stored in the instruction memory 101, and the system 1 standby state 302 is set to monitor whether communication is performed in the system 1. Transition. In the system 1 standby state 302, the CPU 113 detects the presence or absence of an incoming call or an outgoing call in the system 1, and transits to a system 2 measurement state 303 in which it is determined whether or not to shift to the system 2 standby state.
In the system 2 measurement state 303, the reception intensity of the radio wave in the system 2 is measured by the CPU 106, and the CPU 105
The comparison with the reception intensity in the system 1 measured in
This is done at PU113. When the reception intensity in the system 1 is equal to or higher than the reception intensity in the system 2, the system 1 returns to the standby state 302, and when the reception intensity in the system 1 is smaller than the reception intensity in the system 2, the system 2 transits to the standby state 304.

In the system 2 standby state 304, the presence or absence of an incoming call or an outgoing call in the system 2 is detected, and the system 1 periodically transits to the system 1 measurement state 305. In the system 1 measurement state 305, the reception intensity of the radio wave in the system 1 is measured and compared with the reception intensity in the system 2. When the reception intensity in the system 2 is equal to or higher than the reception intensity in the system 1, the system 2 standby state is set. Returning to the state 304, when the reception intensity in the system 2 is smaller than the reception intensity in the system 1, the system 1 transits to the standby state 302. When an incoming call or an outgoing call is detected in the system 1 standby state 302, the system 1 transits to the system 1 communicating state 306. In the system 1 communicating state 306, while maintaining communication in the system 1, the system 2 periodically transits to the system 2 measuring state 307. In the system 2 measurement state 307, while maintaining communication in the system 1, the reception intensity of the radio wave in the system 2 is measured and compared with the reception intensity in the system 1, and the reception intensity in the system 1 is received in the system 2. When the intensity is equal to or higher than the intensity, the system 1 returns to the communicating state 306, and when the reception intensity in the system 1 is smaller than the receiving intensity in the system 2, the system 2 transits to the communicating state 308. The transition from the system 2 measurement state 307 to the system 2 communicating state 308 is a handover from the system 1 to the system 2.

In the system 2 communicating state 308, while maintaining communication in the system 2, the system 1 is regularly
Transition to the measurement state 309. System 1 measurement status 309
Then, while maintaining communication in the system 2, the reception intensity of the radio wave in the system 1 is measured and compared with the reception intensity in the system 2. When the reception intensity in the system 2 is equal to or higher than the reception intensity in the system 1, Returns to the system 2 communicating state 308, and when the reception intensity in the system 2 is larger than the reception intensity in the system 1, transitions to the system 1 communicating state 306.
System 1 measurement state 309 to system 1 communicating state 3
The transition to 06 is a handover from system 2 to system 1. When the call ends during communication in the system 1 communicating state 306 or the system 2 communicating state 308, the system 1 transits to the system 1 standby state 302 or the system 2 standby state 304, respectively.

FIG. 4 is a table showing these state transitions and the programs stored and executed in the instruction memories 101 and 102 at that time. The system 1 standby program is a program including a program for detecting the presence or absence of a call with respect to the system 1 and measuring the reception strength. That is, it includes programs of functions required to operate in the system 1 waiting state 302 and the system 2 measuring states 303 and 307 in FIG. The system 1 standby program is stored in the memory 11
6 and stored in the instruction memory 101, the CP
The program is processed by the U 105, the data memory 107, and the ASIC 109. The system 2 standby program is a program including a program for detecting the presence or absence of a call with respect to the system 2 and measuring the reception strength. That is, the system 2 standby state 304, the system 1 measurement state 305, 3 in FIG.
The program of the function necessary to operate in 09 is included.

The system 2 standby program is called from the memory 116 and stored in the instruction memory 101,
CPU 106, data memory 108, and ASIC 110
It is a program processed by. Further, the system 1 communication program includes a program having a function necessary to operate in the system 1 communicating state 306 in FIG. The system 1 communication program is
Called from the memory 116 and stored in the instruction memory 102, the CPU 105, the data memory 107, and the ASIC
This is a program processed in 109. Further, the system 2 communication program includes a program having a function necessary to operate in the system 2 communicating state 308 in FIG. The system 2 communication program is called from the memory 116 to call the instruction memory 102.
Stored in the CPU 106, the data memory 108 and A
This is a program processed by the SIC 110.

Next, the signal processing device 1 having the above configuration
The operation of 00 will be described with reference to FIGS. 1, 3, 5, and 6. FIGS. 5 and 6 show an operation procedure from when a call is made or a call is received in the system 1 waiting state 302 of FIG. By the way, a preparation operation is necessary before making or receiving a call. The preparatory operation is performed in the following procedure. First, the switch 119 connected to the power supply circuit 117 is turned on. Next, the system 1 standby program held in the memory 116 is called and stored in the instruction memory 101 via the system bus 112. Also, selector 1
A value is written in the control register 111 so that 03 selects the instruction memory 101. This transits to the system 1 standby state 302, and the preparation operation ends. The system 1 standby state 302 and the system 2 measurement state 30
3. In the system 2 standby state 304 and the system 1 measurement state 305, it is possible to operate using the system 1 standby program or the system 2 standby program stored in the instruction memory 101.
The switch 118 is turned off.

Next, a case where the CPU 113 detects an outgoing call or an incoming call in the system 1 standby state 302 will be described. When the CPU 113 detects an outgoing call or an incoming call, the CPU 105, the data memory 107, and the ASIC 109 use the system 1 standby program previously stored in the instruction memory 101 in the preparatory operation to decode the synchronous channel of the system 1. Start operation (step (hereinafter abbreviated as “ST”) 50
1). Next, the switch 118 is turned on to turn on the memory 11
The system 1 communication program held in 6 is called and stored in the instruction memory 102 via the system bus 112 (ST502). Next, after the synchronization channel decoding of the system 1 is completed (ST503), the selector 10
3 and 104 write values in the control register 111 so that the instruction memories 101 and 102 are selected. If the system 1 standby program is not stored in the instruction memory 101, it is stored (ST50).
4). As a result, the system 1 transits to the communicating state 306 and enters the communication state of the system 1 (ST505).

Next, the CPU 105 and the data memory 107
And the ASIC 109 performs communication processing in the system 1.
Next, it is determined whether or not there is an end call instruction (ST50
6). If there is no call end instruction, the state transits to the system 2 measurement state 307, the CPU 106 measures the reception intensity of the system 2, and the CPU 106 and the data memory 108.
And the ASIC 110 decodes the synchronization channel (S
T507). Next, the CPU 113 compares the reception intensity of the system 2 with the reception intensity of the system 1 before shifting to the system 2 measurement state 307 (ST508). System 1
If the received signal strength is higher, the process returns to ST505, and the CPU 105, the data memory 107, and the ASIC1 are restarted.
09 continues communication processing in the system 1. If the reception intensity of the system 2 is higher in ST508, the CPU 106, the data memory 108, and the ASIC 1
10 starts the synchronization channel decoding of system 2 (ST
509).

Next, the system 2 communication program held in the memory 116 is stored in the instruction memory 102 via the system bus 112 (ST510). Next, after the synchronization channel decoding of the system 2 is completed (ST51
1), the selectors 103 and 104 write values to the control register 111 so as to select the instruction memories 102 and 101, respectively. Similarly, the system 2 standby program is stored in the instruction memory 101 (ST512).
Here, the system 2 transits to the in-communication state 308 and communication processing in the system 2 is performed (ST513).

Next, it is determined whether or not there is an end call instruction (ST514). If there is no call termination instruction, the system 1 measurement state 309 is entered, and the reception strength measurement and decoding of the synchronization channel of the system 1 are performed by the CPU 106 using the system 2 standby program of the instruction memory 101.
Performed by the data memory 108 and the ASIC 110 (ST5
15). Next, the reception intensity of the system 1 is compared with the reception intensity of the system 2 before shifting to the system 1 measurement state 309 (ST516). If the reception quality of the system 2 is better, the system 2 communication state 308 is returned to and the ST is returned to.
At 513, the communication processing in the system 2 is continued. ST51
In 6, when the reception quality of the system 1 is better, the process returns to ST501. When the end call instruction is detected in ST506 and ST514, the communication is ended.

As described above, according to the signal processing apparatus of this embodiment, the synchronization channel of the handover destination system is decoded by the processing of the standby program of the instruction memory 101, and the handover destination program is stored in the instruction memory 102.
Since it is rewritten to, it is possible to smoothly perform handover between different mobile communication systems. Further, since the instruction memory 101 stores the waiting program, the storage capacity can be reduced, and when the present signal processor is manufactured by a semiconductor LSI or the like, the chip area can be reduced and realized at a low cost. it can. Further, the system 1 standby state 302, the system 2 measurement state 303, the system 2 standby state 304, and the system 1 measurement state 3
In 05, the switch 118 is turned off and the instruction memory 10
By stopping the supply of electric power to No. 2, it is possible to reduce the leak current consumed only by turning on the power supply to zero, and it is possible to realize with low power consumption. Further, the standby time can be lengthened by reducing the power consumption.

Although the storage capacity of the instruction memory 101 is smaller than the storage capacity of the instruction memory 102 in the present embodiment, both may have the same storage capacity. In this case, the selector 10
The instruction memories 101 and 102 which are the output sources of 3 and 104
May be fixed in advance.

(Second Embodiment) FIG. 7 is a block diagram showing a configuration of a signal processing device 600 according to a second embodiment of the present invention. In FIG. 7, the instruction memories 601 and 602 have the same storage capacity, and the selector 603 is the instruction memory 6
1 is different from FIG. 1 in that the selector 604 is connected only to 01, and the selector 604 is connected only to the instruction memory 602. Since other configurations are the same as those in FIG. Omit it.

The instruction memory 601 is connected to the CPU 105 via the selector 603 and stores a communication program stored in the memory 116, and outputs an instruction to the CPU 105 based on this communication program. The instruction memory 602 is connected to the CPU 106 via the selector 604, stores the communication program stored in the memory 116, and based on this communication program, the CPU
The command is output to 106. In addition, the instruction memory 601 is
It has the same storage capacity as the instruction memory 602. The selectors 603 and 604 are control registers 1
Based on the control signal from 11, the instruction memories 601 and 6
02, the instructions of the program stored in the CPU 10
5 and 106 are output.

FIG. 8 is a table showing the state transitions of FIG. 3 and the programs used at that time. The system 1 dedicated program is a program including a program for detecting the presence or absence of a call with respect to the system 1, measuring the reception strength, and performing communication in the system 1. That is, the program dedicated to the system 1 is the system 1 standby state 302, the system 1 measurement state 305, the system 1 in FIG.
It includes a program of functions required to operate in the communication state 306 and the system 1 measurement state 309 and is called from the memory 116 to store the instruction memory 60.
1 is a program stored in 1 and processed by the CPU 105, the data memory 107, and the ASIC 109. Further, the system 2 dedicated program is to detect the presence or absence of a call with respect to the system 2, measure the reception strength, and
It is a program including a program for communicating with. That is, the system 2 dedicated program includes programs of functions necessary to operate in the system 2 measurement state 303, the system 2 standby state 304, the system 2 measurement state 307, and the system 2 communicating state 308 in FIG. Which is called from the memory 116 and stored in the instruction memory 602.
It is a program processed by the data memory 108 and the ASIC 110. In this embodiment, the instruction memories 601 and 602 are composed of non-volatile memories, and the stored programs are retained even when the power is turned off.

Next, the signal processing device 6 having the above configuration
The operation of 00 will be described with reference to FIGS. 7, 9 and 10. First, the switches 118 and 119 connected to the power supply circuit 117 are turned on (ST80
1). Next, the system 1 stored in the memory 116
The dedicated program is called and stored in the instruction memory 601 via the system bus 112, and the memory 11
The program dedicated to the system 2 held in 6 is called and stored in the instruction memory 602 via the system bus 112 (ST802). Next, the switch 118 is turned off and the switch 119 is turned on (ST803). In this state, it waits for an outgoing call or an incoming call.

Next, the CPU 113 determines whether or not there is an outgoing call or an incoming call in the system 1 (ST80).
4). When the call origination or the call arrival of the system 1 is not detected, the switch 119 is turned off and the switch 118 is turned on (ST805). Next, the CPU 106 measures the reception intensity of the system 2 and the control register 111 controls the selectors 603 and 604 to output the system 2 dedicated program from only the instruction memory 602 to the CPU 106. This causes the CPU 106, the data memory 108, and the ASIC 110 to start the synchronous channel decoding operation of the system 2 (ST806).

Next, the CPU 113 determines whether the reception intensity of the system 2 is higher than that of the system 1 (S).
T807). When the reception strength of the system 1 is higher, the process returns to ST803, the switch 119 is turned on again, and the switch 118 is turned off, and then it is determined whether or not there is an outgoing call or an incoming call in the system 1. When it is determined in ST807 that the reception strength of system 2 is higher, it is determined whether or not there is an outgoing call or an incoming call in system 2 (ST808). When the system 2 determines that no call or call is received, the switch 119 is turned on and the switch 118 is turned off (ST809).
Next, the CPU 105 measures the reception intensity of the system 1, the control register 111 controls the selector 603, and causes the instruction memory 601 to output the system 1 dedicated program to the CPU 105. As a result, the CPU 105, the data memory 107, and the ASIC 109 start the synchronous channel decoding operation of the system 1 (ST810).

Next, it is judged whether the reception intensity of the system 1 is higher than that of the system 2 (ST811). If the system 1 determines that the reception strength is higher, ST80
Returning to step 4, it is again judged whether or not there is an outgoing call or an incoming call in the system 1. If it is determined that the system 2 has a higher reception strength, the process returns to ST808 and the system 2 again.
It is determined whether there is an outgoing call or an incoming call.

If it is determined in ST804 that there is an outgoing call or an incoming call in the system 1, the system 1
Communication state, the CPU 105 and the data memory 10
7 and the ASIC 109 perform communication processing (ST81
2). Next, it is judged whether or not there is an end call instruction (ST8).
13). When the call termination instruction is given, the process returns to ST804, and it is again determined whether or not there is an outgoing call or an incoming call in the system 1. If there is no call end instruction, switch 1
18 is turned on to measure the reception strength of the system 2 and decode the synchronization channel by the CPU 106 and the data memory 108.
And the ASIC 110 (ST814).

Next, the reception intensity of the system 2 and the system 1
Compare with the reception strength of. (ST815) When the reception intensity of the system 1 is higher, the communication process in the system 1 is continued. In ST815, when the reception intensity of system 2 is higher, the communication process in system 2 is started (ST816). Next, it is determined whether there is an end call instruction (ST817). When the call termination instruction is given, the process jumps to ST808, and it is determined whether or not there is an outgoing call or an incoming call in the system 2. When there is no call termination instruction, the switch 119 is turned on, the reception intensity of the system 1 is measured, and the CPU 105, the data memory 107, and the ASIC 109 start the synchronous channel decoding operation of the system 1 (ST818).

Next, the reception intensity is measured by the system 1 and the system 2.
(ST819). If the system 1 has a higher reception strength, the process returns to ST812 and the communication process in the system 1 is performed again. When the system 2 has a higher reception intensity, the process returns to ST816 and the communication process in the system 2 is continued.

As described above, according to the signal processing device 600 of the present embodiment, the instruction memory 101 and the instruction memory 102.
Since programs of different communication systems are stored in both of them, it is not necessary to store a standby program during communication, the processing can be simplified, and handover between communication systems can be smoothly performed. Further, since the processing is performed only by the system 1 dedicated program and the system 2 dedicated program, the storage capacity of the program in the memory 116 is small, and the memory 116 can be downsized.

In this embodiment, the instruction memories 601 and 60, which are the output sources of the selectors 603 and 604, are used.
2 is fixed in advance, but selectors 603, 6
04 may select and output the instruction memories 601 and 602. Further, although the instruction memories 601 and 602 are constituted by the non-volatile memories in the present embodiment, they may be constituted by the ROM (read-only memory).
In that case, in FIG. 8, after turning on all the power supplies, ST8
Since the operation of storing the program in the instruction memories 601 and 602 in 02 is unnecessary, the processing can be further simplified.

(Embodiment 3) FIG. 11 is a block diagram showing a configuration of a signal processing apparatus 900 according to Embodiment 3 of the present invention. The switch 11 of the first embodiment
8, 119 are the same as those in FIG. 1 except that the switch 901 is connected to the circuit group 902 and the switch 903 is connected to the circuit group 904. Therefore, the same reference numerals are given and the description thereof is omitted. To do. The operation of the signal processing device 900 is performed by the switches 901 and 903.
2 and 904 are the same as those in the first embodiment except that the power supply lines are opened and closed.
Descriptions of operations other than the operation of 03 are omitted. Further, the program used in the signal processing device 900 is the same as in the first embodiment.
Since it is the same as FIG. 4 of FIG.

CPU 105, data memory 107 and A
The SIC 109 constitutes the circuit group 904, and the CPU 10
6, the data memory 108 and the ASIC 110 form a circuit group 902.

The switch 901 is arranged between the power supply line connecting the power supply circuit 117 and the circuit group 902, and opens and closes the power supply line from the power supply circuit 117 to the circuit group 902. The switch 903 is arranged between a power supply line connecting the power supply circuit 117 and the circuit group 904, and opens and closes the power supply line from the power supply circuit 117 to the circuit group 904.

Next, the signal processing device 9 having the above configuration
The operation of 00 will be described with reference to FIG. In the system 1 standby state 302 and the system 1 measurement state 305 of FIG. 3, the switch 901 is turned off to turn off the power supplied to the circuit group 902. Then, when an outgoing call or an incoming call is detected in the system 1 standby state 302, the system 1 communication state 306 is entered. In the system 2 measurement state 303 and the system 2 standby state 304, the switch 903 is turned off to turn off the power supply to the circuit group 904.

As described above, according to the signal processing apparatus of the present embodiment, in the system 1 standby state 302 and the system 1 measurement state 305, the switch 901 of the power supply line for supplying power to the circuit group 902 is turned off. Therefore, the leak current in the circuit group 902 can be reduced to zero, and the system 2 standby state 304 and the system 2
In the measurement state 303, the switch 903 of the power supply line that supplies power to the circuit group 901 is turned off, so that the leak current in the circuit group 904 can be reduced to zero. In particular
When manufactured with a semiconductor of 0.18 μm process rule or later), leakage current can be reduced and low power consumption can be realized.
Further, the standby time can be lengthened by reducing the power consumption.

Although the storage capacity of the instruction memory 101 is smaller than that of the instruction memory 102 in the present embodiment, both may have the same storage capacity.
In this case, the CP output by the selectors 103 and 104
U105 and 106 may be fixed in advance.

(Embodiment 4) FIG. 12 is a block diagram showing a configuration of a signal processing apparatus 1000 according to Embodiment 4 of the present invention. 12 is similar to that of FIG.
Power supply line between the power supply circuit 11 and the circuit group 902 and the power supply circuit 11
7 to the power supply line between the circuit group 904 and the switch 90.
1 and 903 are provided and other configurations are the same as those in FIG. 1, and therefore, the same reference numerals are given and the description thereof is omitted. The operation of the signal processing device 1000 is the same as that of FIG. 1 except that the switches 901 and 903 open and close the power supply lines to the circuit groups 902 and 904, respectively. Therefore, operations other than the operations of the switches 901 and 903 are performed. The description is omitted. Further, the program used in the signal processing device 1000 is the same as that in FIG. 4, and therefore its explanation is omitted.

Next, the signal processing device 1 having the above configuration
000 operation will be described with reference to FIG. Figure 3
In the system 1 standby state 302 and the system 1 measurement state 305, the switch 901 is turned off to turn off the power supply to the circuit group 902. Then, in the system 2 measurement state 303 and the system 2 standby state 304, the switch 903 is turned off to turn off the power supply to the circuit group 904.

As described above, according to the signal processing apparatus 1000 of the present embodiment, in addition to the effects of the first embodiment,
In the system 1 standby state 302 and the system 1 measurement state 305, since the switch 901 of the power supply line that supplies power to the circuit group 902 is turned off, the circuit group 902
Leakage current in the system 2 standby state 304 and the system 2 measurement state 30 can be reduced to zero.
In No. 3, since the switch 903 of the power supply line that supplies power to the circuit group 901 is turned off, the leak current in the circuit group 904 can be reduced to zero. In the case of manufacturing with a semiconductor of (μm process rule or later), the leakage current can be reduced and the power consumption can be further reduced as compared with the third embodiment. Further, by setting the power consumption to be low, the standby time can be made longer than that in the third embodiment.

Although the storage capacity of the instruction memory 101 is smaller than that of the instruction memory 102 in the present embodiment, both may have the same storage capacity.
In this case, the CP output by the selectors 103 and 104
U105 and 106 may be fixed in advance.

(Other Embodiments) In the above-described first to fourth embodiments, the case where a mobile communication terminal is used to perform handover between different communication systems has been described, but the present invention is not limited to handover and different communication is performed. It is applicable when switching communication between systems. For example, when it is desired to continuously view different contents, the present invention is also applicable to switching the connection between different contents without disconnecting communication.

The ASIC 109 performs signal processing for GSM transmission / reception, and the ASIC 110 performs UMTS.
You may make it perform the signal processing for transmission / reception of a system. Further, although the two instruction memories 101 and 102 are used, the same effect can be obtained by providing three or more instruction memories. Further, the communication system used is not limited to the UMTS system and the GSM system, but can be applied to any communication system. Further, the number of communication systems used is not limited to two, and can be applied to communication systems of three or more.

[0071]

As described above, according to the present invention,
It is possible to provide smooth and economical communication under an environment where a plurality of communication services can be used at the same time.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a signal processing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a CPU according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating state transition of the communication station device according to the first embodiment of the present invention.

FIG. 4 is a comparison table of state transitions and program types according to the first embodiment of the present invention.

FIG. 5 is a flowchart showing an operation of the signal processing device according to the first embodiment of the present invention.

FIG. 6 is a flowchart showing the operation of the signal processing device according to the first embodiment of the present invention.

FIG. 7 is a block diagram showing a configuration of a signal processing device according to a second embodiment of the present invention.

FIG. 8 is a comparison table of state transitions and program types according to the second embodiment of the present invention.

FIG. 9 is a flowchart showing an operation of the signal processing device according to the second embodiment of the present invention.

FIG. 10 is a flowchart showing an operation of the signal processing device according to the second embodiment of the present invention.

FIG. 11 is a block diagram showing a configuration of a signal processing device according to a third embodiment of the present invention.

FIG. 12 is a block diagram showing a configuration of a signal processing device according to a fourth embodiment of the present invention.

[Explanation of symbols]

101, 102, 601, 602 instruction memory 103, 104, 603, 604 selector 105, 106 CPU 116 memory 117 power supply circuit 118, 119, 901, 903 switches

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiro Moriya             3-1, Tsunashima-Higashi 4-chome, Kohoku-ku, Yokohama-shi, Kanagawa             Matsushita Communication Industry Co., Ltd. F-term (reference) 5K067 AA42 AA43 BB04 DD23 DD27                       DD43 DD44 EE04 HH23 KK05                       KK13 KK15

Claims (7)

[Claims] 1. A first storage means for storing a standby program and a communication program of a first communication system, and a standby program and a communication program of a second communication system which is a communication system different from the first communication system. A second storage means for storing the first communication system, a first processing means for processing the program of the first communication system, a second processing means for processing the program of the second communication system, and the first A signal processing apparatus, comprising: a storage unit or a second storage unit; and a control unit that controls an output from the first processing unit or the second processing unit. 2. A first processing means for processing a standby program and a communication program of a first communication system, and a standby program and a communication program of a second communication system, which is a communication system different from the first communication system. Of the first communication system, the first storage means for storing a standby program of the first communication system or the second communication system, and the first communication system of the second communication system. The second storage means for storing the communication program, the standby program stored in the first storage means, and the communication program stored in the second storage means are switched for each communication system to switch the first program. And a selecting means for outputting to the second processing means. 3. The signal processing apparatus according to claim 2, wherein the first storage means has a smaller capacity than the second storage means. 4. A power supply means for supplying power to the first storage means and the second storage means and a power supply means arranged between the power supply means and the second storage means for receiving or calling. 4. The signal processing device according to claim 2 or 3, further comprising switching means for starting the supply of electric power to the second storage means when a call is detected. 5. A power supply means for supplying power to the first processing means and the second processing means, the power supply means, the first processing means, the power supply means, and the second processing. And means other than the first processing means or the second processing means for processing the standby program of the first communication system or the second communication system when an incoming call or an outgoing call is detected. 5. The signal processing device according to claim 2, further comprising a switching unit that starts the supply of electric power. 6. A communication device comprising the signal processing device according to claim 1. Description: 7. A first processing step of processing a standby program and a communication program of a first communication system, a second processing step of processing a standby program and a communication program of a second communication system, and the standby program. A first storing step for storing the communication program, a second storing step for storing the communication program, a standby program stored by the first storing step, and a communication program stored by the second storing step, A signal processing method, comprising: a selection step of switching to perform processing by the first processing step or the second processing step for each communication system.