JP2000217146A - Radio communications equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide equipment capable of suppressing useless power consumption, when transmitting and receiving data by detecting whether or not the data to be transmitted are present and controlling whether or not to transmit the data at the transmission timing of the data of a transmission means based on a detected result. SOLUTION: Radio frequency signals are received by an antenna, and they reach a reception part 13 through the high frequency switch 12 of a radio part 1. In the reception part 13, the radio frequency signals received are mixed with reception local oscillation signals generated from a frequency synthesizer and converted into received intermediate frequency signals. The radio part 1 is provided with a reception electric field strength detection part 16. In the electric field strength detection part 16, the reception electric field strength of the radio frequency signals arriving from a base station BSH for a household or the base station BSP for public is detected and the detected value is reported to a control part 5. The received intermediate frequency signals outputted from the reception part 13 are sent out to the digital demodulation circuit 21 of a modem 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio communication apparatus of a TDMA system such as a PHS (Personal Handy Phone System) terminal or a portable telephone, and more particularly to a radio communication apparatus capable of performing bidirectional data communication. is there.

[0002]

2. Description of the Related Art Conventionally, in this type of wireless communication device,
Bidirectional data communication has been configured. In this case, the transmitting / receiving operation is not always performed between the wireless communication devices, and battery saving is performed in a slot other than the designated slot. However, the transmission / reception operation is always performed at the designated slot regardless of the presence or absence of data.

For example, in a PHS terminal, data transmission has been performed as shown in a flowchart of FIG. During data communication, it is detected whether the transmission timing has arrived (S51). That is, in the PHS, the transmission slot (TX) and the reception slot (RX) are switched every 2.5 ms as shown in FIG.
Each slot is divided into four, and one of the time slots is assigned to perform transmission and reception. Therefore, TX1,
It is necessary to wait for the time slot indicated by TX2, TX3,...

When the transmission timing comes, the transmission system is shifted from the battery saving state to the ON state (S52), and it is detected whether data to be transmitted is prepared (S53). Here, if data to be transmitted is prepared, the data is transmitted (S54, S5).
5). On the other hand, if data to be transmitted is not prepared, dummy data is transmitted (S56, S57).

When the transmission of the data to be transmitted or the dummy data is completed, the transmission system is shifted to the battery saving state (S58). In the battery saving state, the transmission timing (transmission time slot TX
1, TX2, TX3,...) Corresponds to a portion where power consumption is reduced. Next, it is detected whether or not a disconnection of communication has been input (S59). Here, if there is no disconnection input, the process returns to step S51 to continue the operation, and if there is a disconnection input, the transmission system is turned off (S60) and the operation shifts to the standby state.

[0006]

As described above, in the conventional wireless communication apparatus, each transmission time slot TX
, TX2, TX3,... Always transmit, so that power is greatly consumed at this time. Therefore, there is a problem that useless power is consumed by transmitting the dummy data.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the conventional wireless communication apparatus, and has as its object to provide a wireless communication apparatus capable of suppressing wasteful power consumption when transmitting and receiving data. It is to provide a device.

[0008]

According to the present invention, there is provided a radio communication apparatus comprising: a transmitting means for transmitting data via a radio line; and a data communication state using the transmitting means. And transmitting control means for controlling whether or not to transmit data at the data transmission timing of the transmitting means based on the detection result of the detecting means. Thereby, if there is no data to be transmitted at the data transmission timing, data transmission can be prevented from being performed.

The wireless communication apparatus according to the present invention further comprises a power supply control means for controlling power supply to the transmission system, and the power supply control means detects that there is no data to be transmitted by the detection means. In this case, the transmission system is set to a battery saving state at a transmission timing when the transmission control unit does not perform data transmission. Thereby, the transmission system enters the battery saving state at the transmission timing when the transmission control unit does not perform data transmission, and power consumption can be suppressed.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A radio communication apparatus according to an embodiment of the present invention will be described below with reference to the accompanying drawings. In each drawing, the same components are denoted by the same reference numerals, and redundant description will be omitted. In the following description, a PHS terminal is taken as an example, but other TDMA wireless communication devices such as mobile phones can be similarly configured. As shown in FIG. 1, the PHS terminal includes a radio unit 1 having an antenna 11, a modem unit 2,
It includes a TDMA unit 3, a communication unit 4, a control unit 5, and a power supply unit 7. The control unit 5 includes an operation unit 51 including various keys, an LCD control unit 53 for controlling an LCD (liquid crystal display) 52, a sounder 54 for generating a ringing tone, and a vibrator 59 for notifying an incoming call by vibration. Is connected.

In the above PHS terminal, the home base station BSH
Alternatively, a radio frequency signal arriving from the public base station BSP is received by the antenna 11 and reaches the reception unit 13 via the high frequency switch (SW) 12 of the radio unit 1. In the receiving unit 13, the radio frequency signal received as described above is mixed with a receiving local oscillation signal generated from the frequency synthesizer 14 and converted into a receiving intermediate frequency signal. The local oscillation frequency generated by the frequency synthesizer 14 is instructed by the control unit 5 according to the radio channel frequency. The radio unit 1 includes a reception electric field strength detection unit (RSS).
I) 16 is provided. This reception electric field strength detection unit 1
6 is a home base station BSH or a public base station BS
The received electric field strength of the radio frequency signal arriving from P is detected, and the detected value is notified to the control unit 5.

The received intermediate frequency signal output from the receiving section 13 is sent to the digital demodulation circuit 21 of the modem section 2. The digital demodulation circuit 21 digitally demodulates the received intermediate frequency signal, thereby reproducing a digital communication signal.

The TDMA decoder 31 of the TDMA unit 3
In accordance with an instruction from the control unit 5, a digital communication signal is extracted from a time slot assigned to the own device, and the extracted digital communication signal is transmitted to the communication unit 4. The communication unit 4 uses an adaptive differential PCM codec (ADPCM-COD).
EC) 41 and a PCM codec (PCM-CODE)
C) 42, and the digital speech signal is sequentially decoded by the adaptive difference PCM codec 41 and the PCM codec 42 to reproduce an analog speech signal.
The reproduced analog call signal is output from the speaker 43 after being amplified by a receiver amplifier (not shown).

On the other hand, the transmitted voice input to the microphone 44 is sequentially encoded by the PCM codec 42 and the applied differential PCM codec 41 to be a digital speech signal. In the TDMA encoder 32, the digital speech signal transmitted from the adaptive difference PCM codec 41 is inserted into a time slot specified by the control unit 5 and transmitted to the digital modulation circuit 22. In the digital modulation circuit 22, the carrier signal is modulated by the digital communication signal, and the modulated signal according to the modulation result is transmitted to the transmission unit 15. In the transmitting section 15, the modulated signal is mixed with the transmitting local oscillation signal generated from the frequency synthesizer 14 to be frequency-converted to the radio channel frequency specified by the control section 5 and further amplified to a predetermined transmission power level. Is done. The radio frequency signal transmitted from the transmission unit 15 is transmitted from the antenna 11 to the home base station BSH or the public base station BSP via the high frequency switch 12.

The power supply unit 7 includes a battery 71 composed of a secondary battery.
And the output voltage of the battery 71 is changed to a predetermined operating voltage Vcc.
And a power supply circuit 72 for converting the power supply to In the above, the transmission unit 15, the digital modulation circuit 22, and the TDMA encoder 32 constitute a transmission system for transmitting data, and the reception unit 13, the digital demodulation circuit 21, and the TDMA decoder 3
1 constitutes a receiving system for receiving data. The transmission system can be in a battery saving state in preparation for data transmission, in which state power consumption is reduced.
Data to be transmitted, which is input by operation of the operation unit 51, is stored in the transmission data storage unit 56 of the control unit 5, and is transmitted from the control unit 5 through the path of the TDMA encoder 32, the digital modulation circuit 22, and the transmission unit 15. You. On the other hand, the received data is received by the receiving unit 13, the digital demodulation circuit 21, the TDMA
It is provided to the control unit 5 through the path of the decoder 31.

The control unit 5 includes a detection unit 55, a transmission data storage unit 56, a power supply control unit 57, and a transmission control unit 58. The control unit 5 performs the operation shown in the flowchart of FIG. 2 and performs the operation as each of the above units. First, during data communication, it is detected whether the transmission timing has arrived (S1). In the PHS terminal, the transmission slot (TX) and the reception slot (RX) are switched every 2.5 ms as shown in FIG.
Each slot is divided into four, and one of the time slots is assigned to perform transmission and reception. Therefore, TX1,
It is necessary to wait for the time slot indicated by TX2, TX3,...

At the transmission timing (S1), it is detected whether there is data to be transmitted (S2 (detection means 5).
5)). Here, if the data to be transmitted is prepared in the transmission data storage unit 56, the transmission system is shifted from the battery saving state to the ON state (S4 (the power supply control unit 5).
7)), the data is transmitted (S5, S6 (transmission control means 58)). When the data transmission is completed, the transmission system is shifted to the battery saving state (S7 (power supply control means 57)), and the number of transmissions set in a register described later is reset (S8).

On the other hand, if it is detected in step S2 that there is no data to be transmitted, the number of transmissions is forwarded based on the value of the register in which the number of transmissions of data (the number of arrivals of each allocated transmission time slot) is set. It is detected whether the number is within the number of protection stages (S3). Here, the number of forward protection stages is the number of time slots that are synchronized by the radio equipment of the other party (here, the base station) by the data arriving at each time slot and are not synchronized because no data arrives. is there. For example, if the PHS terminal does not send data in three transmission time slots consecutively and the base station cannot receive data, and becomes asynchronous because the base station cannot receive data, "2"
Is the number of forward protection steps. Therefore, the data of the number of forward protection steps differs depending on the system and is set in the control unit 5 in advance.

If it is detected in step S3 that the number of transmissions is within the number of forward protection stages, the number of transmissions set in the register is incremented by "1" (S9), and the transmission is not performed (transmission control). (Means 58) Maintaining the battery saving state of the transmission system (S10)
(Power supply control means 57)). For this reason, when the data “2” of the number of forward protection stages is set in the control unit 5 in advance, and there is no data to be transmitted, as shown by a broken line in FIG. T
Without transmitting data to X3, the transmission system is maintained in the battery saving state, and no power is consumed.

On the other hand, if it is detected in step S3 that the number of transmissions has reached the number of forward protection stages, the number of transmissions set in the register is reset (S11).
Then, the transmission system is shifted from the battery saving state to the ON state (S12 (power supply control means 57)), and the dummy data is transmitted (S13, S14 (transmission control means 5).
8)).

As described above, for example, when the data "2" of the number of forward protection stages is set in the control unit 5 in advance, when the data of the number of forward protection stages of the register becomes "3", the transmission set in the register is performed. Since the number of times is reset and dummy data is transmitted at the third transmission timing, as shown by a broken line in FIG. 3, when data transmission is not performed in the transmission time slots TX2 and TX3, the transmission time slot is not transmitted. Dummy data transmission is performed on TX4. When the transmission of the dummy data is completed, a process of shifting the transmission system to the battery saving state is performed (S15 (power supply control means 57)).

When the processing of steps S8, S10 and S15 is completed, it is detected whether or not a disconnection of communication has been input (S1).
6). Here, if there is no disconnection input, the flow returns to step S51 to continue the operation, and if there is a disconnection input, the transmission system is turned off (S17) and the apparatus shifts to the standby state.

As described above, in this embodiment, if there is no data to be transmitted, regardless of the arrival of the transmission timing,
It is possible to reduce the power consumption by maintaining the battery saving state without transmitting the dummy data up to two times (the number of times that the data is not asynchronous).

[0024]

As described above, according to the radio communication apparatus of the present invention, if there is no data to be transmitted at the data transmission timing, it is possible to prevent the data transmission from being performed, thereby eliminating unnecessary transmission and reducing power consumption. Can be suppressed.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a PHS terminal which is an embodiment of a wireless communication device according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the wireless communication device according to the present invention.

FIG. 3 is a diagram for explaining power consumption during a data transmission / reception operation of the wireless communication device according to the present invention.

FIG. 4 is a diagram for explaining power consumption during a data transmission / reception operation of a conventional example.

FIG. 5 is a flowchart for explaining the operation of a conventional wireless communication device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Radio | wireless part 2 Modem part 3 TDMA part 4 Talk part 5 Control part 7 Power supply part 51 Operation part 52 LCD 53 LCD control part 54 Sounder 55 Detection means 56 Transmission data storage part 57 Power supply control means 58 Transmission control means

 ──────────────────────────────────────────────────続 き Continuing on the front page F term (reference) 5K011 DA26 DA29 FA01 GA04 JA01 KA03 5K028 BB04 CC02 HH02 5K034 AA15 CC05 EE03 EE13 HH01 HH50 HH65 TT05 TT06 5K060 CC04 CC12 DD04 EE05 FF09 HH31 CC04 MMCC GG02 GG03

Claims (4)

[Claims] A transmitting means for transmitting data via a wireless line; a detecting means for detecting whether there is data to be transmitted in a data communication state using the transmitting means; and a detecting means for detecting the detecting means. And a transmission control means for controlling whether or not data transmission is performed at the data transmission timing of the transmission means based on the result. 2. The wireless communication apparatus according to claim 1, wherein when the detecting means detects that there is no data to be transmitted, the transmitting control means prohibits data transmission until a predetermined transmission timing arrives. . 3. The transmission control means, when a predetermined transmission timing arrives, when there is no data to be transmitted,
The wireless communication device according to claim 1, wherein dummy data transmission is performed. 4. A power supply control means for controlling power supply to a transmission means, wherein the power supply control means determines that the transmission control section performs data transmission when the detection means detects that there is no data to be transmitted. 2. The wireless communication apparatus according to claim 1, wherein the transmission unit is set to a power supply stop state at different timings.