JP2825562B2 - Wireless communication device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a wireless communication apparatus that transmits data from a first station to a second station using a very low-power radio wave in a very high frequency band.

2. Description of the Related Art There is known a wireless communication apparatus that transmits data from a first station to a second station by using a very-high-frequency radio wave in a very high frequency band. For example, a mobile station that is provided on a bed of a ward and is provided in a biological information detecting device that detects biological information of a patient and transmits the biological information using radio waves in an ultrahigh frequency band, and a mobile station that is provided in a centralized monitoring device in a nurse room. This is a hospital telemeter system including a base station that receives radio waves in the ultrahigh frequency band and outputs biological information to an output device such as a display.

Problems to be Solved by the Invention By the way, in the above-mentioned radio communication device, a super-high-frequency band of a relatively short wavelength with a small output is required so that anyone without a license prescribed by the Radio Law can easily handle it. Because the data is transmitted using the radio waves, even within the communicable range, it is easily affected by obstacles such as walls and floors in buildings and living organisms such as nurses and doctors who move indoors, In some cases, data transmission was hindered.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless communication device capable of reliably performing data communication even when using an ultrashort wave radio wave having a weak output. is there.

Means for Solving the Problems The gist of the present invention for achieving the above object is a radio communication device for transmitting data from a first station to a second station using a very low output radio wave in a very high frequency band. And (a)
A data loss determining means provided in the second station for determining whether or not the data received by the second station via the radio wave of the ultrahigh frequency band is missing; (b) the data loss determining means; A long-wave transmission unit that transmits a retransmission command signal for requesting retransmission to the first station using an electromagnetic field signal in a long-wave band when the data loss determination unit determines that there is data loss. A band transmitting device, and (c) receiving, from the first station, the retransmission command signal, and using the long-wave electromagnetic field signal to convert the data determined to be missing by the data loss determining means. And a long-wave band transmitting / receiving device for retransmission.

In this way, in a state where data is transmitted from the first station to the second station using the ultra-high-frequency radio wave with a small output,
When the data received by the second station is determined to be missing by the data loss determining means provided in the second station, the long-wave band transmitting device provided in the second station retransmits the data to the first station. A retransmission command signal for obtaining is transmitted using an electromagnetic field signal of a long wave band, and the retransmission command signal is received by a long wave transmission / reception device provided in the first station, and data is lost. The determined data is retransmitted to the second station using an electromagnetic field signal in a long wave band. In this way, when data transmitted by the ultra-short wave radio wave is missing, it is re-transmitted with a long wave electromagnetic field signal that has different propagation characteristics from the ultra-short wave radio wave and has the property of being hardly affected by obstacles Since the command signal is transmitted from the second station to the first station, and the data is retransmitted from the first station to the second station in the long-wave band electromagnetic field signal, it is affected by walls and floors, and living organisms in the room. It becomes difficult and reliable data communication becomes possible.

Here, the long wave band means a frequency of about 30 to 500 kHz,
The ultra high frequency band means a frequency of about 30 to 322 MHz.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, a nurse room 14 and a plurality of hospital rooms 16 are arranged on both sides of a corridor 12 of a hospital ward 10. Nurse room 14
The centralized blood pressure monitoring device 18 provided in the
A monitor main body 20 including an input / output device such as an image display device and an arithmetic device, and frequency modulation of command data and the like output from the monitor main body 20, for example, 30 to 50
A second transmission / reception circuit 24 that converts the signal into a signal having a carrier frequency f _L of about 0 kHz and outputs the signal to the fixed antenna 22 is provided. In this embodiment, the second transmitting / receiving circuit 24 is a base station,
That is, it functions as the second station. Then, the signal of the frequency f _L is supplied from the second transmitting / receiving circuit 24 to the fixed antenna 22 so that the fixed antenna 22 emits a long wave that has a long wavelength and is hardly affected by a wall, a floor, and a living body. It has become. One end of the fixed antenna 22 is connected to the second transmitting / receiving circuit 24, and the other end is connected to a terminator 26. In the sickroom 16, an automatic sphygmomanometer 34 including a first transmitting / receiving circuit 30 having a whip antenna 28 and a blood pressure measuring circuit 32 is arranged. This automatic sphygmomanometer 34 usually has its cuff attached to the patient on the bed and automatically measures the blood pressure value at a predetermined cycle or in accordance with a command from the centralized blood pressure monitoring device 18, while the measured blood pressure value is Is transmitted to the carrier frequency f via the first transmitting / receiving circuit 30.
It is designed to be transmitted by radio waves in the ultrahigh frequency band of _VH . In this embodiment, the first transmitting / receiving circuit 30 functions as a mobile station, that is, a first station. The fixed antenna 22 is
As shown in FIG. 2, it is composed of two wires 22a and 22b.

In the blood pressure measurement circuit 32 shown in FIG. 3, blood pressure measurement is performed at predetermined intervals, and data representing a blood pressure value is output to the control circuit 54 each time the measurement is performed. From the control circuit 54, data representing the blood pressure value is supplied to the UHF band modulation circuit 60 in order to emit an ultrashort wave band of the frequency f _VH from the whip antenna 28, and the data is always switched to the receiving side (b side). A switching signal for switching the transmission / reception switch 50 to the transmission side (a side) is supplied to the transmission / reception switch 50. As a result, the whip antenna 28 emits a radio wave in the ultrahigh frequency band of the frequency f _VH .

In the second transmission / reception circuit 24 shown in FIG. 2, the transmission / reception switches 40a and 40b are always switched to the reception side (b side), and the radio wave of the ultrahigh frequency band of the frequency f _VH emitted from the automatic sphygmomanometer 34 is UHF after being received by fixed antenna 22
The band demodulation circuit 42 converts the data into data representing a blood pressure value, and the data is passed through the control circuit 44 to the monitor main body.
Supplied to 20. As a result, the monitor main body 20 records the trend of the patient's blood pressure value for each bed and intensively monitors whether the blood pressure value is abnormal.

The data representing the blood pressure value is also supplied from the UHF band demodulation circuit 42 to the data loss determination circuit 46, where it is determined whether or not there is data loss. In this embodiment, the data loss determining circuit 46 functions as a data loss determining means provided in the second station.

In the data loss determination circuit 46, based on whether or not the data was received within a predetermined fixed reception time zone, or at a predetermined position at the leading and trailing ends of a series of signals constituting the data Based on whether the leading code signal and the terminating code signal are present,
Alternatively, data loss is determined based on a well-known parity check. Then, the data loss determination circuit 46
If it is determined that data is missing, the control circuit
The data missing signal SD is output to 44.

The control circuit 44 outputs the retransmission command signal SB to the long-wave band modulation circuit 48 in response to the supply of the data loss signal SD, and while the retransmission command signal SB is being supplied, The transmission / reception switching units 40a and 40b are connected to the transmission side (a side).
The transmission / reception switching devices 40a and 40
Output to 0b respectively. Thus, the electromagnetic field signals of the long-wave band of a frequency f _L which represents the re-transmission command signal SB is fired from a fixed antenna 22, received in the whip antenna 28.
In the present embodiment, the long wave band modulation circuit 48 functions as a long wave band transmitting device provided in the second station.

As shown in FIG. 3, the signal of the frequency f _L received by the whip antenna 28 is supplied to a long-wave demodulation circuit 52 through a transmission / reception switch 50 which is constantly switched to the receiving side (b side), where it is re-transmitted. Demodulated to transmission command signal SB. When the retransmission command signal SB is supplied from the long wave band demodulation circuit 52 to the control circuit 54, the control circuit 54 transmits the data determined to have data loss in the data loss determination circuit 46 again. Supplies the data to the long-wave band modulation circuit 56 in response to the supply of the retransmission command signal SB, and while the data is being supplied, the transmission / reception switch
A switching signal for switching 50 to the transmission side (a side) is output to the transmission / reception switch 50. As a result, the electromagnetic field signal in the long wave band of the frequency f _L representing the above data is converted to the whip antenna.
Fired from 28 and received by fixed antenna 22. In this embodiment, the long-wave band demodulation circuit 52 and the long-wave band modulation circuit 56
Functions as a long-wave transmission / reception device of the first station.

The signal of the frequency f _L representing the data received by the fixed antenna 22 in this manner is transmitted and received by the transmission / reception switchers 40a and 40b
Is supplied to the long-wave band demodulation circuit 58, where the data is newly converted to data and supplied to the control circuit 44. For this reason,
The new data is supplied to the monitor main body 20 instead of the data determined to be missing, so that the monitor main body 20 monitors the blood pressure value based on the new data without missing.

As described above, according to the present embodiment, the first transmission / reception circuit 30 and the second transmission / reception circuit 30
In a state where data is transmitted to the second transmission / reception circuit 24,
When it is determined that the data received by the second transmission / reception circuit 24 is missing by the data loss determination circuit 46 provided in the second transmission / reception circuit 24, the first transmission / reception is performed by the long wave band modulation circuit 48 provided in the second transmission / reception circuit 24. A retransmission command signal for requesting retransmission to the circuit 30 is transmitted using an electromagnetic field signal of a long wave band, and a long wave band demodulation circuit 52 provided in the first transmission / reception circuit 30 is provided.
As a result, the retransmission command signal is received, and the data determined to have lost data is retransmitted to the second transmitting / receiving circuit 24 by the long wave band modulation circuit 56 using the long wave band electromagnetic field signal. In this way, when data transmitted by the ultra-short wave radio wave is missing, it is re-transmitted with a long wave electromagnetic field signal that has different propagation characteristics from the ultra-short wave radio wave and has the property of being hardly affected by obstacles A command signal is issued from the second transmission / reception circuit 24 to the first transmission / reception circuit 30, and data is transmitted from the first transmission / reception circuit 30 to the second transmission / reception circuit 24 in the form of a long-wave electromagnetic field signal.
Since the data is re-transmitted to the wall, it is hardly affected by the wall, the floor, and the living body in the room, and reliable data communication can be performed.

As mentioned above, although one Example of this invention was described based on drawing, this invention is applied also in another aspect.

For example, in the above-described embodiment, the one-way communication from the first transmission / reception circuit 30 to the second transmission / reception circuit 24 is always performed by the ultra-high frequency band radio wave.
A UHF band demodulation circuit is provided, and the UHF
By providing a band modulation circuit, bidirectional communication may be always performed between the first transmission / reception circuit 30 and the second transmission / reception circuit 24 by using a radio wave in an ultrahigh frequency band. In this case, a data loss determination circuit may be provided in the first transmission / reception circuit 30 so that the first transmission / reception circuit 30 outputs a retransmission command signal for requesting the second transmission / reception circuit 24 to retransmit.

Further, the first transmitting / receiving circuit 30 and the second transmitting / receiving circuit 24 of the above-described embodiment are provided with the common whip antenna 28 or the fixed antenna 22 for emitting the electromagnetic wave signal of the long wave band and the radio wave of the ultrashort wave band. Alternatively, an antenna for a long wave band and an antenna for a very short wave band may be provided respectively.

In the second transmission / reception circuit 24 of the above-described embodiment, the data loss determination circuit 46 is provided independently of the control circuit 44. The data loss determination circuit 46 is configured by software in the control circuit 44. You can also.

The above is merely an example of the present invention, and the present invention can be variously modified without departing from the purpose thereof.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an arrangement of a blood pressure monitoring system to which an embodiment of the present invention is applied. FIG. 2 and FIG.
FIG. 2 is a block diagram showing the configuration of the embodiment of FIG. 1. FIG. 2 shows the configuration of the second transmission / reception circuit, and FIG. 3 shows the configuration of the first transmission / reception circuit. 24: second transmission / reception circuit (second station) 30: first transmission / reception circuit (first station) 46: data loss determination circuit (data loss determination means) 48: long wave band modulation circuit (long wave transmission device) 52: long wave band Demodulation circuit (long wave band transmitter / receiver) 56: Long wave band modulation circuit (long wave band transmitter / receiver)

Claims (1)

(57) [Claims] 1. A wireless communication apparatus for transmitting data from a first station to a second station using a very-high-frequency radio wave in a very high frequency band, wherein the wireless communication device is provided in the second station and communicates via the very high frequency wave. A data loss determining means for determining whether or not the data received by the second station is missing; and a data missing determining means provided in the second station, wherein the data missing determining means determines that data is missing. A long-wave band transmission device that transmits a retransmission command signal for requesting retransmission to the first station by using a long-wave electromagnetic field signal; and a long-wave band transmission device provided in the first station; And a long-wave transmission / reception device for retransmitting the data determined to be missing by the data loss determination means using a long-wave electromagnetic field signal.