JPH078063B2 - Wireless signal transmission processing method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a wireless signal transmission processing method.

[0002]

2. Description of the Related Art A wireless system has been developed and used in which a wireless signal transmitted from a wireless transmitter is received by a wireless receiver to perform necessary control processing. Such systems include, for example, a wireless service call system used in restaurants and the like, and a wireless security system for disaster prevention monitoring and crime prevention monitoring of dwelling units.

FIG. 6 shows an example of a wireless service call system. When a customer calls a waitress at a restaurant or the like, each table (not shown) is shown.
Operation switch 1 of the wireless transmitter 100 installed in
When 00a is operated, a wireless signal including data unique to the transmitter 100 is transmitted, the wireless signal is received and demodulated by the antenna 200, the demodulated signal is transmitted to the display unit 400 via the notification unit 300, and operated. A number is displayed on the display window 400a corresponding to the transmitter 100, and a ringing tone is output by the alerting unit 300. The waitress identifies the customer who called by the ringing of the alerting tone and the number display. You can get to know them and respond smoothly.

In such a wireless service call system, an ID code is set by an ID code setting section (not shown) provided in each wireless transmitter 100, ..., Test transmission is performed, and the ID is temporarily displayed on the display unit 400 side. After the code is registered, only the wireless signal of the wireless transmitter 100 having the registered ID code will be accepted thereafter, and even if the systems using the same frequency are installed adjacent to each other, it malfunctions. Has been prevented.

However, in such a wireless service call system, all the wireless signals transmitted from the respective wireless transmitters 100 ... Use the same frequency band and use weak radio waves which do not require notification. Therefore, if a strong jamming radio wave of the same frequency arrives at the installation area of the system from the outside, the wireless signal is disturbed and cannot be received, and normal system operation cannot be performed, so that no countermeasure can be taken.

[0006]

SUMMARY OF THE INVENTION The present invention has been proposed in view of the above circumstances. Even when a wireless signal is disturbed by external noise on a specific channel, the wireless signal is transmitted on another channel. It is an object of the present invention to provide a wireless signal transmission processing method capable of performing stable wireless control.

[0007]

SUMMARY OF THE INVENTION The present invention as set forth in claim 1, which is proposed to achieve the above object, has a plurality of predetermined transmissions each time a transmission operation is performed on the wireless transmitter side. The same transmission data is transmitted as one group of continuous transmission data while sequentially switching the channels until it makes at least one cycle according to a predetermined switching pattern, while the wireless receiver side transmits the one group of continuous transmission data to the plurality of transmissions. The reception channel corresponding to the channel is received while being sequentially switched at predetermined intervals according to a predetermined switching pattern. In such a method of the present invention, when the transmission data transmitted from the wireless transmitter is received by the wireless receiver side, it is possible to send back an acknowledge signal. By doing so, the wireless transmitter Then, when a transmission operation is performed, a group of continuous transmission data may be repeatedly transmitted until an acknowledgment signal is returned from the wireless receiver side.

According to the second aspect of the present invention, a plurality of sets of switching patterns of the transmission channel and the reception channel are prepared in advance so as to correspond to each other, and the wireless transmitter according to the switching pattern of the selected transmission channel. While transmitting a group of continuous transmission data, the wireless receiver is configured to receive the group of continuous transmission data while sequentially switching the reception channels according to a correspondingly selected reception channel switching pattern. .

According to the present invention of claim 3, in the invention of claim 2, the switching patterns of the transmission channel and the reception channel are set on the wireless transmitter side and the wireless receiver side, respectively. It is adapted to be selectively set corresponding to a specific bit of the house code.

[0010]

According to the present invention as set forth in claim 1, on the wireless transmitter side, every time a transmission operation is performed, the transmission channels are sequentially operated in accordance with a predetermined switching pattern until a plurality of predetermined transmission channels make at least one cycle. While switching, the same transmission data is transmitted as one group of continuous transmission data. On the other hand, on the wireless receiver side, a group of continuous transmission data is received while sequentially switching the reception channels corresponding to the plurality of transmission channels at predetermined intervals according to a predetermined switching pattern. As a result, the receiving channel on the wireless receiver side changes sequentially, and even if the current receiving channel is interrupted by external noise and transmission data cannot be received, the next group of continuous transmission data is transmitted. In this case, the transmission data can be received by another reception channel.

According to the second aspect of the present invention, the wireless transmitter transmits the group of continuous transmission data while sequentially switching the transmission channels in accordance with the selected transmission channel switching pattern, while the wireless receiver is 1 transmitted from the wireless transmitter while sequentially switching the reception channels according to the selected reception channel switching pattern 1
It is adapted to receive the group's continuous transmission data. Therefore, by properly selecting the switching pattern between the wireless transmitter and the wireless receiver, it is possible to increase the reception probability of a specific channel, which starts transmission of a group of continuous transmission data. The time required from reception to reception can be shortened.

According to the present invention as set forth in claim 3, if the house codes of the wireless transmitter and the wireless receiver are set to be the same, the transmission channel and the reception channel are switched so as to increase the reception probability of a specific channel. The pattern is correspondingly selected.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 (a) and 1 (b) schematically show the wireless signal transmission processing method according to the present invention. On the wireless transmitter side, when a transmission operation is performed, a predetermined channel 0 ( While sequentially switching the transmission channels from ch0) to channel 9 (ch9) according to a predetermined switching pattern (switching pattern for switching in the order of the numbers of the transmission channels), the same transmission data is transmitted as a group of continuous transmission data D.
It is supposed to be sent as. On the other hand, on the wireless receiver side, separately from the wireless transmitter side, it is set at a predetermined predetermined period (in the present embodiment, set to be larger than the period during which the group of continuous transmission data D is transmitted from the wireless transmitter) In this case, ch0 to ch9 are repeatedly switched in accordance with a predetermined switching pattern (a switching pattern in which the channels are switched in the order of the number of the receiving channel and then the channel 9 is returned to channel 0) to perform scanning reception. .

Therefore, for example, when a noise signal having a frequency of channel 0 (ch0) arrives in the wireless system system, it is normal if the wireless receiver receives the reception channel 0 according to the switching pattern. If the wireless receiver cannot perform reception, but the receiving channel of the wireless receiver when the wireless transmitter performs a transmission operation again is, for example, ch8, a group of consecutive transmissions transmitted from the wireless transmitter side is performed. The data of ch8 of the data D is normally received by the wireless receiver side and necessary control can be performed.

As described above, according to the method of the present invention, since the reception channel of the wireless receiver is sequentially changed every predetermined time, even if the interference noise is added to the specific channel,
It becomes possible to receive a group of continuous transmission data at the time of receiving another reception channel, and it is possible to prevent inability to receive data due to interference noise.

FIG. 2 shows switching patterns of transmission channels and reception channels corresponding to the lower 4 bits of the house code set on the side of the wireless transmitter and the wireless receiver in association with each other. 2 and 3), for example, the lower 4 bits of the house code are “00
When set to "00", the transmission channel switching pattern is "0 → 5 → 1 → 6 → 2 → 7 → 3 → 8 → 4 → 9 → 0".
The channel is switched as described above, and the transmission is performed on the channel 0 at the start of the transmission, and the transmission is repeatedly performed on the channel 0 at the end of the transmission. On the other hand, the receiving channel switching pattern is “0 → 0 → 1 → 0 → 2 → 0 → 3 → 0 → 4 → 0.
→ 5 → 0 → 6 → 0 → 7 → 0 → 8 → 0 → 9 → 0 ”, so that the reception period of channel 0 is increased by the pattern of switching to channel 0 one by one during the switching from channel 0 to 9. (Improving the probability of reception) so that the transmission data transmitted from the wireless transmitter is received as early as possible. If external noise of channel 0 is arriving at the installation location of the wireless system, change the house code setting and set the lower 4 bits to a value other than "0000" so that the channel with the highest reception probability can be obtained. Channels other than channel 0 can be set, and reception efficiency can be improved.

FIG. 3 shows the details of the group of continuous transmission data D transmitted from the wireless transmitter when the lower 4 bits of the house code are set to "0000". When performed, first, RCR data (described later) is transmitted, and subsequently, transmission data of each channel is sequentially transmitted according to a predetermined switching pattern. The RCR data is standardized by the (Foundation) Radio Wave System Development Center and is composed of a 20 ms 0 continuous signal, a 57 ms RCR number, and a 35 ms synchronization character (repeated signal of FF, 00). Further, the transmission data of each channel includes a lock-up time of 5 ms, a synchronization character of 20 ms, an error reset time of transmitting 1 continuous signal for 10 ms, and 15
It is composed of data of ms, and this data is composed of text start signals STX1 and STX2, a house code HC, a transmission code DT, a carriage return code CR and a line feed code LF. Therefore, the RCR data has a transmission time of 112 ms, and each channel has 5
Since it has a transmission time of 0 ms, it takes 662 ms to transmit the group of continuous transmission data D.

In the above description, the transmission data is transmitted from the wireless transmitter, while the wireless receiver receives the transmitted data and performs necessary control. However, for example, the wireless receiver is It is also possible to cause the wireless transmitter side to send back an acknowledge signal when the transmission data is normally received.

FIGS. 4A and 4B are time charts showing the operation when an acknowledge signal is returned. On the receiver side, a specific one of the group of continuous transmission data D is specified. When the channel data is received and the data is confirmed, an acknowledgment signal (ACK signal) is sent back to the transmitter side after 700 ms has elapsed (transmission is surely completed at the transmitter side). .

In addition, in FIGS. 5A and 5B, the ACK signal is not returned from the receiver side even if the transmitter side transmits the group of continuous transmission data D. In this case, a time chart for automatically retransmitting one group of continuous transmission data D is shown, and a predetermined time T (in this embodiment, 2. After the elapse of (setting within the range of 9 to 4 seconds), repeat the operation of retransmitting the group of continuous transmission data D until the wireless signal is received by the receiver side and the ACK signal is returned. Since it is repeated, the reliability of wireless signal transmission can be improved. In the above explanation,
Although the type of wireless signal is not particularly mentioned, the method of the present invention can be applied to wireless signals such as radio signals and optical signals.

[0021]

As can be understood from the above description, according to the present invention as set forth in claim 1, a group of continuous transmission data transmitted from the wireless transmitter is transmitted to the wireless receiver side in a predetermined manner. Since the receiving channel is received while switching sequentially according to the switching pattern, on the wireless receiver side,
Even if the current reception channel cannot receive the transmission data due to the interference of external noise, it becomes possible to receive the transmission data on another reception channel when the next group of continuous transmission data is transmitted, The reliability of wireless signal transmission can be improved. According to the present invention as set forth in claim 2,
Since the transmission channel switching pattern and the reception channel switching pattern are set in advance in correspondence with each other, the data transmitted from the wireless transmitter is received by the wireless receiver regardless of which switching pattern is selected. Probability is increased, which can reduce the time it takes to be received. According to the present invention as set forth in claim 3, if the house codes of the wireless transmitter and the wireless receiver are set to be the same, the switching patterns of the transmission channel and the reception channel are correspondingly selected and set. There is no need to set each time.

[Brief description of drawings]

1A and 1B are schematic diagrams illustrating a wireless signal transmission processing method according to the present invention.

FIG. 2 is an explanatory diagram of a switching pattern of a transmission channel and a reception channel, which is pre-allocated according to the lower 4 bits of the house code.

FIG. 3 is a detailed explanatory diagram of a group of continuous transmission data transmitted from the wireless transmitter side.

4 (a) and 4 (b) are time charts for explaining the operation when an acknowledge signal is returned from the receiver side when a group of continuous transmission data is transmitted from the transmitter side.

5 (a) and 5 (b) are time charts for explaining the operation when an acknowledge signal is returned from the receiver side when the second continuous transmission data of the first group is transmitted from the transmitter side. Is.

FIG. 6 is an explanatory diagram showing a schematic configuration of a wireless service call system.

[Explanation of symbols]

 D: One group of continuous transmission data

Claims (3)

[Claims] 1. On the wireless transmitter side, every time a transmission operation is performed, the same transmission data is continuously switched while sequentially switching a plurality of predetermined transmission channels according to a predetermined switching pattern until at least one cycle is completed. On the other hand, the wireless receiver receives the first group of continuous transmission data while sequentially switching the reception channels corresponding to the plurality of transmission channels at predetermined intervals according to a predetermined switching pattern. A wireless signal transmission processing method characterized by the above. 2. A plurality of sets of switching patterns of the transmission channel and the reception channel are prepared in advance so as to correspond to each other, and the wireless transmitter transmits a group of continuous transmission data according to the switching pattern of the selected transmission channel. On the other hand, the wireless receiver is configured to receive a group of continuous transmission data while sequentially switching the reception channels according to a correspondingly selected reception channel switching pattern. Wireless signal transmission processing method. 3. A switching pattern of the transmission channel and the reception channel is selected and set corresponding to a specific bit of a house code set on the wireless transmitter side and the wireless receiver side, respectively. The method of transmitting and processing a wireless signal according to claim 2, which is characterized in that.