JPH02222327A - Wireless repeating control system - Google Patents

Abstract

PURPOSE:To prevent the collision of a wireless signal by setting a position code which can discriminate a position relation to a receiver to a repeater, and allowing the repeater being near the receiver to execute preferentially a repeating operation. CONSTITUTION:For instance, a signal from a transmitter 2a is received by a repeater 3a0 having a position code 00, and a repeater 3a1 having a position code 01, and in this case, the repeater 3a0 being near a receiver 4 transmits a repeating signal first, and subsequently, the repeater 3a1 being distant from the receiver 4 transmits the repeating signal. A delay time until the repeater 3a1 executes the transmission after the repeater 3a0 executes the transmission is set so as to be roughly equal to a transmission time of a series of signals from the repeater 3a0, namely, a carrier signal for showing a transmission start, a data tone signal for a substantial information transfer, and a carrier signal for showing a transmission stop. In such a way, there is no possibility that wireless signals from plural repeaters or transmitters come into collision with each other.

Description

Detailed Description of the Invention [Industrial Application Fields] The present invention provides a method for disposing a repeater between a wireless transmitter and a receiver, receiving a transmitted signal at the repeater, and transmitting the received signal. It relates to a control method for a wireless relay system that expands the usable range between a transmitter and a receiver by retransmitting, and is used in fields such as wireless simple paging systems and home security systems. It is something that will be done.

[Prior Art] Conventionally, in this type of wireless relay system, a device code for identifying each device is registered in advance, and the device code is included in the transmission signal, so that the device on the transmitting side is A control method has been proposed in which relay is performed only when the code and the device code on the receiving side match.

[Problems to be Solved by the Invention] However, in order to realize relaying in a state where the location of the transmitter cannot be specified, it is virtually necessary for all repeaters to have the function of relaying transmitter information. be. If there is a transmitter or another repeater between the repeaters, multiple repeaters will perform relay operations almost simultaneously, causing collisions of wireless signals and communication failures. There are many things to do.

The present invention has been made in view of these points, and an object of the present invention is to provide a wireless relay control method that can prevent collisions of wireless relay signals and ensure good communication conditions.

[Means for Solving the Problem] In order to solve the above problem, the present invention receives a wireless signal transmitted from a transmitter, and receives a wireless signal received by a receiver or another relay device. A wireless repeater that retransmits a signal is characterized by comprising means for setting a position code that can identify the positional relationship with the receiver, and a control means for preferentially relaying a repeater closer to the receiver. That is.

Note that as the control means, means for changing the timing of reception or retransmission of wireless signals depending on the position code may be used.

[Operations] In the present invention, as described above, a position code that can identify the positional relationship with the receiver is set in the repeater, so that the 11 middle repeaters closest to the receiver are preferentially operated as a relay. So,
Even if a transmission signal is received from a transmitter or another relay device, wireless signals are not transmitted from multiple relay devices at the same time, and collision of wireless signals can be prevented.

[Embodiment] 7 FIG. 3 is a schematic configuration diagram of a wireless relay system to which the present invention is applied. In the figure, 1 a and 1 b are transmitters in a fixed state, and 2 a and 2 b are transmitters in a moving state. * 3 a o + 3 a + exists on the relay route between the transmitting IR 1 a and the receiver 4 It is a relay machine. 3b0
3b is a relay machine existing on the relay route between the transmitter 1b and the receiver 4. The wireless signal from the mobile state transmission@2a is being received simultaneously by the two relays 3a, 3a. Wireless signals from other transmitters 1a or lb, 2b are received by one repeater 3a1 or 3b+, respectively.

FIG. 4 shows the internal circuit configuration of each repeater.

This repeater 3 includes an internal power supply circuit 31 that supplies power for driving, and a receiving antenna 32 that is necessary for receiving wireless signals.
a, a high frequency amplification unit 32 that amplifies the wireless signal;
A signal demodulation unit 33 extracts necessary information from a high-frequency amplified wireless signal, a relay control unit 34 processes information necessary for relay control, a carrier detection unit 35 detects the presence and strength of a wireless signal, A signal modulation unit 36 that converts a signal into a high frequency signal, a high frequency amplification unit 37 that amplifies this high frequency signal to a level suitable for transmission, a transmission antenna control unit 38 that performs control to send the amplified high frequency signal to the antenna, It consists of transmitting antennas 38a and 38b for emitting high-frequency signals as radio waves, and three operating state setting sections for setting various operating conditions. Operating state setting section 3
A code setting switch 39a, a mode setting switch 39b, and a code registrability setting switch 39c are added to the main unit. The code setting switch 39a is a switch for setting a position code and a device code indicating the distance relationship with the receiver. The mode setting switch 39b and the code registration property setting switch 39c are not related to the gist of the present invention, so their explanation will be omitted. Contains a timing device for measuring time. On the other hand, the transmitter 2 has switches 21 and 22 depending on the purpose, and when the switch 21 or 22 is pressed, a wireless signal in a predetermined format is transmitted.

FIGS. 1(a) and 1(b) show an example of operation in which relay priority is changed using a location code. The signal from transmission R2a is relay fi3a with location code 00.

is received by the relay fi3a with the position code 01'5:, but the middle m machine 3ao, which is closer to the receiver 4, transmits the relay signal first, and then the relay fi3a, which is farther from the receiver 4, transmits the relay signal.
3a transmits a relay signal. Relay machine 3a.

The delay time from when the relay fi3a+ transmits to when the relay fi3a+ transmits is determined by a series of signals from the relay fi3a (a carrier signal indicating the start of transmission, a data tone signal for actual information transmission, a signal indicating the stop of transmission). This is set to be approximately equal to the transmission time of the carrier signal shown in FIG. By controlling in this way, it is possible to suppress signal collision with a transmission signal from a transmitter or another repeater, and interference that occurs during reception at another repeater or reception at a receiver. Furthermore, if the delay time is set to be longer than the transmission time of a series of signals, extremely good received signals can be obtained and stable reception control can be achieved. In addition, even if the delay time is set within the transmission time of a series of signals, the possibility of signal collision can be reduced by using the method of switching to the signal receiving state when a carrier signal is detected. This makes it possible to ensure a good reception state.

A flowchart for realizing the control operation of the wireless relay device as described above is shown in FIG.
If N, external code input processing is performed in #20, and the position code and other external codes set in the code setting switch 39a are read. Next, reception processing is performed in #30, and the received signal is read in #40. Determine the presence or absence. If there is no received signal at #40, the process returns to #30 and the reception process is repeated.

If there is a received signal in #40, the transmission delay time of the wireless relay signal is processed in #50. Here, the transmission delay time of the wireless relay signal is set according to the position code. For example, as shown in FIG. As shown in (b), the position code is 0
If 0, the transmission delay time is the transmission time Δt of a series of signals
If the position code is 01, the transmission delay time is set to be approximately twice the transmission time ΔL of the series of signals. Similarly, when the position code is 10, the transmission delay time is set to approximately three times the transmission time Δt of the series of signals, and when the position code is 11, the transmission delay time is set to the transmission time of the series of signals. It is good to set it to about 4 times Δt (N). If set in this way, transmission signals from repeaters 3 with different position codes will not collide.

When the transmission delay time processing is completed in #50, the transmission processing is performed in #60, and the process returns to the reception processing in #30.

Fig. 2(b) shows the transmission delay time processing (#) shown in Fig. 2(b).
50) is exemplified. First, in #51, it is determined whether the position code is 00 or not. If the position code is OO in #51, a wait is performed for a transmission delay time of 1×Δt in #52, where the time Δt is approximately equal to the transmission time of a series of signals from the middle U unit 3. If the position code is not 00 in #51, it is determined whether the position code is 01 in #53. If the position code is 01 in #53,
At #54, a standby period of transmission delay time 2×ΔL is performed. If the position code is not 01 in #53, the position code is 1 in #55.
Determine whether it is 0 or not. If the position code is 10 in #53, wait for transmission delay time 3 x Δt in #54, #5
3, if the position code is not 10, error processing is performed in #57. Note that instead of the error processing in #57, a configuration may be adopted in which a transmission delay time of 4 x ΔL is performed. The code is not limited to 2 bits, but 3 bits.
Generally speaking, if the value of the position code is i, by setting the transmission delay time of (i+1)
It is possible to prevent the transmission signals from colliding with each other.

Although the explanation in Fig. 2 (a) and (b) is based on the premise that the control of the repeater is performed by software, it goes without saying that the control of the repeater may be performed by hardware. is not limited to only radio waves, and may be, for example, an optical signal (including infrared rays), a sonic signal (including ultrasonic waves), or a line of magnetic force.

[Effects of the Invention] According to the present invention, in the wireless relay device, a position code that can identify the positional relationship with the receiver is set, and the relay device closest to the receiver is preferentially operated as a relay.
There is no possibility that wireless signals from a plurality of repeaters or transmitters will collide, and there is an advantage that relay control can be performed reliably.

Furthermore, if the timing of reception or retransmission of wireless signals is controlled to vary according to the position code, it is possible to prevent collisions of wireless signals with only simple time control.

[Brief explanation of the drawing]

FIGS. 1(a) and 1(b) are explanatory diagrams of the operation of the present invention, and FIG.
a) and (b) are flowcharts showing the operation of an embodiment of the present invention, FIG. 3 is a schematic configuration diagram of a wireless medium system to which the present invention is applied, and FIG. 4 is an internal diagram of a repeater used in the above. FIG. 2 is a block diagram showing the configuration. 2a is a transmitter, 3ao+38+ is a repeater, and 4 is a receiver. Figure 1

Claims (2)

[Claims] (1) Receive a wireless signal transmitted from a transmitter,
In a wireless repeater that retransmits a wireless signal received by a receiver or another repeater, a means for setting a position code that can identify the positional relationship with the receiver, and a method that prioritizes repeaters closer to the receiver. A wireless relay control method characterized by comprising: a control means for relaying operation to the wireless relay control system. (2) The wireless relay control system according to claim 1, wherein the control means is means for changing the timing of receiving or retransmitting a wireless signal according to a position code.