JPH09163450A - Compound terminal equipment for mobile communication - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable use through both the systems of personal handy phone system(PHS) and personal digital cellular(PDC) system and to preferentially use the more inexpensive PHS of less power consumption. SOLUTION: A radio reception part 1, radio transmission part 2 and control part 3 are constituted together so as to be operated by either PHS or PDC and the control part 3 performs control so as to perform registration in a base station when communication is enabled by the PHS but to perform registration in a PDC base station when PHS communication is disabled. Besides, a power supply control part 306 performs control so as not to supply power to any unwanted circuit corresponding to the communication system.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication composite terminal, and more particularly to a mobile communication composite terminal that can be used as either a cordless radio telephone or a cellular radio telephone.

[0002]

2. Description of the Related Art As a conventional mobile communication telephone device, there is a cellular type mobile communication system capable of two-way communication such as a mobile phone or a car phone. Further, recently, cordless service (PHS) service has started. The former cellular system has a service area that can be used almost all over the country, and high-speed mobile communication is possible. In addition, the cordless system is
It has the features of low call charges, low power consumption of cordless wireless telephones, and long-term non-charge use.

[0003]

Each of the above-mentioned cellular or cordless mobile communication systems has its own advantages and disadvantages. In other words, the cellular system has a wide service area and can be used by high-speed moving bodies, but on the other hand, the call charge is higher than that of an ordinary subscriber phone,
Further, there is a problem that the cellular type wireless telephone consumes a large amount of power and is not suitable for carrying for a long time. On the other hand, the cordless system has an advantage that the call charge is low and the power consumption of the cordless wireless telephone is small, but it has a disadvantage that the service area is small and it cannot be used in a high-speed moving body such as a vehicle.

Therefore, by subscribing to the above two systems, the advantages of both systems are utilized, that is, the call charge is as low as possible, the power consumption of the portable radio telephone device is low, and the service is available even in a wide area and high-speed mobile body. It is considered possible to receive the service, but for this purpose, at present, it is necessary to carry both a cordless type wireless telephone and a cellular type wireless telephone and use them properly. At the same time, it is necessary to activate the cordless type wireless telephone and the cellular type wireless telephone and register the terminal in the base station of each system to determine which service is available at the current location. This does not save power consumption.

An object of the present invention is to enable a single terminal to be used as both a cellular radio telephone and a cordless radio telephone, and to preferentially use the cordless radio telephone when available. ,
It is an object of the present invention to provide a mobile communication compound terminal which can be used with low power consumption and low call charges as much as possible and can be used in a wide service area and a high-speed mobile body.

[0006]

SUMMARY OF THE INVENTION The present invention is a mobile communication compound terminal having transmission and reception functions of two different mobile communication systems, and it is automatically switched or manually selected which system is used for reception standby. Disclosed is a composite terminal for mobile communication, which is provided with means for performing switching.

Further, according to the present invention, in a composite terminal for mobile communication, it is checked whether a predetermined first system in the mobile communication system can be registered in a base station of the mobile communication system as a reception standby state. If the registration is possible, the registration is performed and the first system waits for reception, and if the check cannot be registered in the first system, the second system different from the first system is registered. Disclosed is a composite terminal for mobile communication, which is equipped with an automatic switching control means for controlling to perform registration.

Further, the present invention is a shared terminal used in common for two mobile communication systems in a mobile communication complex terminal, and a first dedicated circuit used only in either of the two mobile communication systems. A circuit is composed of a circuit and a second dedicated circuit, and power is supplied only to the necessary one of the first or second dedicated circuit depending on which system of the two mobile communication systems is being used, Disclosed is a composite terminal for mobile communication, which is equipped with a power supply control means for controlling not to supply electric power to unnecessary ones.

[0009]

Embodiments of the present invention will be described below in detail. FIG. 1 is a block diagram showing an example of the configuration of a digital mobile communication composite terminal according to the present invention, which is a digital cellular system (PDC).
And PHS (Personal Handy Phone System). This apparatus includes a wireless reception unit 1, a wireless transmission unit 2, a control unit 3, a receiver 4, a microphone 5,
It is composed of a key input unit 6, a display unit 7, a power supply unit 8 and the like for performing operations such as power on / off and mode switching.
The antenna includes an internal antenna 9 and an external antenna 10. The wireless reception unit 1 has a dual-mode compatible front-end unit 120 and a dual-mode compatible station-embedded back-end unit 130, and the wireless transmission unit 2 is a dual-mode connected to the frequency variable external antenna 10. Corresponding antenna switching / matching unit 20
1. Local quadrature modulator 22 with local oscillator and mixer
It has 0. Further, the control unit 3 is an analog ASIC.
(Application Specified Integrated Circuit) 30
1. Digital ASIC 303, DSP (Digital Sign
al Processor) 302, CPU 304, memory 305,
It has a power supply control circuit 306 and the like.

The radio receiving unit 1, the radio transmitting unit 2, and the control unit 3 are configured so as to realize the functions of both the cordless radio telephone and the cellular radio telephone, and the control unit 3 is Power is supplied to each of the circuits and a signal path is controlled in accordance with an operation mode indicating whether to operate as a cordless wireless telephone or a cellular wireless telephone. Here, the operation mode is determined by either automatic determination by the control unit 3 or manual selection by the user's judgment, as will be described later.

The operation of the composite terminal for mobile communication having the above-described structure is performed in the order of the signal flow corresponding to the operation mode, the power supply control in each operation mode, and the automatic or manual setting method of the operation mode. Will be described below. First, the flow of signals during operation as a cordless wireless telephone is as follows. At this time, it is assumed that power is supplied in advance from the power control unit 306 to the necessary circuits. Further, by the control signal CONT from the control unit 3, the changeover switches (SW) 115 and 208 of the wireless reception unit 1 and the wireless transmission unit 2 are both in the state where the terminals a and c are connected, and Antenna switching / matching circuit (SW / MN) 10 so that the external antenna 10 is used for both transmission and reception
1 and 201 are set. In the state of the antenna switching / matching circuit 201, the input from the terminal b is output from the terminal a and transmitted from the external antenna 10, and the signal received by the external antenna 10 is input from the terminal a and output to the terminal d. It is something. On the other hand, in the state of the antenna switching / matching circuit 101, the input from the terminal b is output to the terminal c. Thus, in the case of the cordless system, the external antenna 10 is always used for transmitting / receiving.

When a voice is input to the microphone 5 in this state, the voice signal is the analog ASIC 301 and the DSP.
ADPCM (Adaptive Differential Pulse) in 302
Code Modulation) circuit converts into a digital signal. Further, the MODEM function in the DSP 302 performs conversion into two pulse trains for quadrature phase modulation (QPSK) and waveform shaping of each pulse by the root Nyquist filter so that the spectrum after modulation does not spread as much as possible. Pulse waveform, digital AS
The baseband signal bs at the transmission timing determined by the TDMA control circuit (time division control circuit) in the IC 303.
Is input to the wireless transmission unit 2.

In the radio transmitter 2, the local oscillator signal L _Scell output from the local oscillator 209 is quadrature phase modulated by the quadrature modulator (QPSK) 210 by the input baseband signal bs. However, at this time, the frequency of the _local oscillation signal L _Scell is fixed. Also, this modulation is (π / 4) QPS
The K method. Further, this four-phase modulated wave is applied to the mixer 211 via the changeover switch 208, where it is up-converted by the local oscillation signal L _Scode from the local oscillator 212 to have a signal (1.9 GHz) having a cordless radio frequency. Obi) is converted. After that, the external antenna 10 is passed through the filter 207, the power amplifier 206, the filter 205 and the antenna switching / matching circuit 201.
Sent from.

In the radio receiving unit 1, a received input wave from the external antenna 10 is input to the mixer 110 via the antenna switching / matching circuits 201 and 101, the filter 108, and the amplifier 109, where the local oscillator 117 is present.
_Is converted into a signal in the intermediate frequency band by the local oscillation signal L _Rcode from. The signal in the intermediate frequency band passes through the amplification / filter circuit 111 and is mixed by the mixer 112 in the local oscillator 11
It is converted to a baseband signal by the local oscillation signal L _{IF code} from the signal No. 4. This baseband signal is output to the changeover switch 11
5, sent to the control unit 3 via the amplifier 116, where T
Processing such as DMA separation, ADPCM decoding, and analog signal conversion is performed, and the speaker 4 or the display unit 7 is displayed.
Output to

Next, the operation as a cellular radio telephone will be described. At this time, the power supply control unit 30
It is assumed that power is supplied from 6 in advance. Further, the control signal CONT from the control unit 3 connects the terminals a and b of the changeover switches 115 and 208 of the wireless reception unit 1 and the wireless transmission unit 2 together. Further, in the antenna switching / matching circuit 201, in the case of this cellular type, the input signal from the terminal c is always output to the terminal a and transmitted from the external antenna, and the reception is from the terminal a when the external antenna is used. Of the control signal C so that the input (the reception wave of the antenna) is output to the terminal d.
Controlled by ONT. Further, in the antenna switching / matching circuit 101, when the external antenna is used for reception, the input to the terminal b is output to the terminal d, and when the internal antenna is used, the input to the terminal a is output from the terminal d. Controlled by CONT. Whether to use the external antenna 10 or the internal antenna 9 is
The control unit 3 makes a decision while watching the received electric field.

When a voice is input to the microphone 5 in the above state, the voice signal is the analog ASIC 301 and the DSP.
VSELP (Vector Sum Excited Linear Pr in 302)
The digital signal is converted into two pulse trains in the same manner as in the cordless system, and the waveform is shaped and sent to the quadrature modulator 210 of the wireless transmission unit 2 at the timing of the TDMA control circuit. Then, the local oscillation signal L _Scell from the local oscillator 209 is _subjected to 4-phase phase modulation.

Since the terminals a and b of the changeover switch 208 are connected to each other, the output of the quadrature modulator 210 is output to the terminal b as it is, and the antenna changeover is performed via the filter 204, the amplifier 203 and the filter 202. It is input to the terminal c of the matching circuit 201. Then, as described above, it is transmitted from the external antenna 10 according to the connection state of the antenna switching / matching circuit 201.

On the other hand, the received wave at the external antenna 10 or the internal antenna 9 is the antenna switching / matching circuit 20.
It is inputted to the filter 102 via the amplifiers 1 and 101, and the amplifier 1
After being amplified by 03, the local oscillator 11 is generated by the mixer 104.
It is mixed with the local signal L _Rcell from 7 and converted into a signal in the intermediate frequency band. This intermediate frequency band signal is amplified and
The mixer 106 via the filter circuit 105 converts the local oscillator signal L _IFcode from the local oscillator 114 into a baseband signal. This baseband signal is sent to the control unit 3 via the changeover switch 115 and the amplifier 116, where it is subjected to processing such as TDMA separation, VSELP decoding, and conversion into an analog signal, and the speaker 4 or the display unit 7 is processed. Is output to.

The frequencies of the transmission / reception operation in each of the above systems are shown in Table 1 when the PDC system and the PHS system in Japan are specifically shown. In this table, "down" and "up" are from the terminal

[Table 1] If you look at it, it corresponds to reception and transmission respectively. In the PDC system, frequency bands are thus separated for upstream and downstream lines, and a plurality of lines are used in time division for each frequency channel. And there are two systems of 800MHz band and 1.5GHz band. On the other hand, in the PHS system, each frequency channel set in one band of the 1.9 GHz band is used by time division, and the transmission / reception lines are separated by this time division and used. As is clear from this table, in the PDC system, the transmission / reception (up and down) bands are 130 MHz and 48 M in both the 800 MHz band and the 1.5 GHz band.
Hz apart, which is exactly at the intermediate frequency of each system. Therefore, the local oscillator signal L _Scell from the local oscillator 209 and the local oscillator signal L _Rcell from the local oscillator 117.
Have the same frequency and these local oscillators can be combined into one oscillator. The output frequency of the local oscillator signal L _Scell from the local oscillator 209 in the cordless system is 940 MH in the case of supporting PDC (800 MHz).
For z and PDC (1.5 GHz), it is fixed at 1429 MHz.

Now, as is clear from the above description of the operation,
Each circuit in the wireless reception unit 1, the wireless transmission unit 2, and the control unit 3 operates in both the cellular system mode and the cordless system mode, and some circuits operate in only one mode. Among these, the circuit that operates in only one operation mode and requires power supply supplies power only when it is operating and does not supply power when it is not operating, thus reducing power consumption as a terminal device. You can save money. The power supply control unit 306 provided in the control unit 3 is a circuit that performs this control. By turning on / off the current from the power supply unit 8, the output S0,
Turn on and off S1 and S2. Here, the output S0 is output in both the cellular mode and the cordless mode, and a circuit that operates in both modes, for example, the local oscillator 209 and the quadrature modulator 21.
0, amplifier 116, CPU 304, etc. Further, the output S1 is a circuit that operates only in the cordless system, for example, the local oscillator 212, the amplifiers 206 and 10
9. Power is supplied to the ADPCM circuit and the like in the DSP 302. The output S2 is a circuit that operates only in the cellular system, for example, the amplifiers 203 and 103, the DSP 30.
Power is supplied to the VSELP circuits and the like in 2. However, as a method of classifying the power supply to these circuits, for those that consume a small amount of power, even if only one mode is operated, the power is always supplied and the ADPCM is used.
Only circuits that require large power consumption such as circuits and VSELP circuits may be supplied to the outputs S1 and S2. With such a configuration, it is possible to realize a terminal device that saves power consumption as much as possible even if it has functions of both modes.

Next, the operation mode switching of this terminal will be described. In both the cellular system and the cordless system, by turning on the power of the terminal and exchanging signals with the base station, the terminal transmits to the base station in the area where it exists. Registration is performed, and in this way, it is in a reception standby state in which calls can be made and received at any time. However, when both functions are built in like the terminal of the present invention, power consumption is wasted.

One method for solving this is a method in which the user determines which type of service area he / she is currently in and sets the operation mode by inputting from the key input unit 6. Then, the control unit 3 reads this setting and controls the power supply control unit 306 and the changeover switches 115 and 208 as described above. In this case, if the user does not know in which service area the call is made, the call is first tried as a cordless method with low power consumption, and if successful, the call is started as it is.
If the cordless method is no good, set the cellular method.
However, in this case, for example, if the cordless method is still set, the call from the other party may not be accepted.

Another method of setting the mode is to always use the cordless method and attempt registration with the base station. If it succeeds, the power supply and various switches are automatically set by the control unit 3 so that the terminal operates as a cordless terminal, and the terminal is in a reception waiting state. Also, when the cordless system cannot be registered in the base station, the power supply and various switches are automatically set by the control unit 3 so that it operates as a cellular system terminal, and the system is registered in the corresponding base station and waits for reception. State. According to this method, when a call is possible as a cordless system, it operates as the terminal, and it is automatically set to the cellular system only when the cordless system cannot be used. If you are in the area where you can talk, you can talk anywhere on the high-speed moving body, and you can always receive calls.

In the above description, the circuit commonly used in the two systems and the circuit used only in one system are treated separately. However, the circuits for each system are completely separated and the power supply is switched. The mode switching method of the present invention may be used. Further, in the embodiment of FIG. 1, the present invention has been described as a terminal device that covers the PDC system and the PHS system in Japan. However, these frequencies and channel configurations, and the presence or absence of time division use and time division are used. Obviously, the present invention can be applied to a system having different methods.

[0025]

According to the present invention, it is possible to use a low power consumption and inexpensive system without confirming the service area by switching the system to be used automatically or manually at the time of waiting for reception, and such a system can be used. Calls can be made even in areas where is not available or in high-speed mobile units. In addition, the terminal can have an economical structure by sharing a part that can be shared by the two systems.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration example of a composite terminal for mobile communication according to the present invention.

[Explanation of symbols]

 1 Radio Receiver 2 Radio Transmitter 3 Controller 101, 201 Antenna Switching / Matching Circuit 114, 117, 209, 212 Local Oscillator 115, 208 Local Signal 104, 106, 110, 112, 211 Mixer 210 Quadrature Modulator 301 Analog ASIC 302 DSP 303 Digital ASIC 304 CPU 306 Power supply control unit

Claims (7)

[Claims] 1. A composite terminal for mobile communication having a transmission / reception function of two different mobile communication systems, comprising means for automatically switching or manually switching which system should be used for reception standby. A mobile terminal for mobile communication. 2. The composite terminal for mobile communication according to claim 1, wherein a predetermined first system of the mobile communication systems can be registered as a reception standby state in a base station of the mobile communication system. If the registration is possible, the registration is performed and the first system waits for reception. If it is not possible to register with the first system by the check, the second system different from the first system is checked. A composite terminal for mobile communication, comprising automatic switching control means for controlling registration to a system. 3. The composite terminal for mobile communication according to claim 1, wherein a shared circuit shared by the two mobile communication systems is used, and only one of the two mobile communication systems is used. A circuit is composed of a first dedicated circuit and a second dedicated circuit to be used, and only the first or second dedicated circuit is required depending on which system of the two mobile communication systems is being used. A composite terminal for mobile communication, comprising power supply control means for supplying electric power and controlling not to supply electric power to unnecessary ones. 4. The composite terminal for mobile communication according to claim 3, wherein the first system is a cordless mobile communication system and the second system is a digital cellular mobile communication system. Multi-function terminal for mobile communication. 5. The composite terminal for mobile communication according to claim 4, wherein the first dedicated circuit includes an ADPCM circuit used for voice coding of a cordless type mobile communication system, and the second dedicated circuit. Includes a VSELP circuit used for speech coding of a cellular mobile communication system. 6. The composite terminal for mobile communication according to claim 4, wherein the external antenna, the internal antenna, and the external antenna always perform transmission and reception when used in the cordless mobile communication system. Type mobile communication system, an antenna switching / matching circuit for switching antennas so as to switch between the external antenna and the internal antenna for transmission / reception according to the reception state of the power supply, Compound terminal for communication. 7. The composite terminal for mobile communication according to claim 6, wherein a first local oscillator that outputs a carrier wave of the cellular mobile communication system and a quadrature modulation of the first carrier wave with a transmission signal pulse are performed. A quadrature modulator, a mixer, and a modulated wave of the output of the quadrature modulator is sent to the antenna switching / matching circuit when used in the cellular mobile communication system, and the mixer is used when used in the cordless mobile communication system. And a local oscillation signal for converting the modulated wave sent to the mixer via the changeover switch to the frequency band of the cordless mobile communication system during use in the cordless mobile communication system. And a second local oscillator that outputs a signal, and a composite terminal for mobile communication, comprising: