JPS6170822A - Radio relay system - Google Patents

Abstract

PURPOSE:To change a wired approach line to a radio line by storing temporarily a received voice of a press-to-talk radio equipment and using a transmitter to transmit the stored voice. CONSTITUTION:The system consists of a transmission station 1 and a relay station 4. The received radio wave fro an antenna 5 is demodulated by a receiver 7 through a transmission/reception switch 6. The demodulated signal is stored temporarily by a logical section 8, and transmitted to the next relay station from the transmitter 9 as a modulation signal via a switch 6 and the antenna 5. Thus, the approach line is converted into a radio line from a wired line.

Description

[Detailed Description of the Invention] (Technical Field) In order to expand the wireless area using a single radio frequency, this invention provides a relay function to the radio equipment of fixed stations and mobile stations to transmit radio frequencies (information) in multiple stages. This relates to a relay method.

(Prior Art and its Problems) Conventionally, as shown in the configuration example of FIG. 2, there is a method in which a transmission station 1 is relayed in multiple stages to a repeater 3 via a leaky coaxial cable 2. Since this method uses a wired connection called a leaky coaxial cable, it has the drawback of being uneconomical in terms of materials, construction work, etc., and is also complicated in terms of maintenance.

(Objective) In order to eliminate these drawbacks, the present invention changes the approach line from wired to wireless. Another object of the present invention is to use a single radio device as a repeater in order to make the repeater more economical.

(Example) Recently, with the spread of digital memory, it has become easier to store audio. By temporarily storing the audio received by a BreathTalk radio and transmitting the stored audio using a transmitter, it is possible to record audio using a single radio frequency. It can be used as a repeater using.

An embodiment of this invention will be described below. FIG. 1 is a system diagram of the present invention, where 1 is a transmitting station.

4 is a relay station and F is a single radio frequency. This relay station 4
The configuration will be explained with reference to FIG. The radio wave received from the antenna 5 passes through the transmission/reception switch 6 and is demodulated by the receiver 7. The demodulated signal is temporarily stored in the logic section 8, and then sent to the transmitter 9 as a modulated signal by the switch 6. The signal is transmitted via antenna 5 to the ninth relay station.

The need to store this information in the logic unit 8 is for the purpose of using a Breathtalk radio. Next, we will discuss the configuration of the logic section 8 in the fourth section.
This will be explained in detail with the drawings. The audio signal demodulated by the receiver is temporarily stored in the storage unit 81, and the signal unit 82 identifies the signal necessary for determining whether the local station should transmit to the next station, and If so, a call signal from the signal generation circuit 83 is added to the logic circuit, and after receiving the squelch close signal from the receiver, transmission is started and the transmission/reception switch is driven.

Here, the types of tones assigned to the signal generator section 82 and the signal generating circuit 83 are fn and fn+1. In such a configuration, radio frequency signals can be wirelessly relayed. FIG. 5 shows a sequence that is relayed in multiple stages.

(Effect) Is there strictly no simultaneity in the wireless relay system according to the present invention?
A low cost and economical system using a single radio frequency, Breathtalk radio can be provided.

[Brief explanation of the drawing]

Fig. 2 is a block diagram of a conventional relay system, Figs. 1, 3 to 5 show embodiments of the present invention, Fig. 1 is a system diagram of a wireless relay system, Fig. 3 is a block diagram of a relay station, and Figs. FIG. 4 is a block diagram of the logic section, and FIG. 5 is a sequence of multi-stage relay. 1: transmitting station, 3: repeater, 4: relay station, 8: logic section. Agent Patent Attorney Akio Takahashi Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] In a wireless relay system for mobile communication using a single radio frequency, the contents of a call are temporarily stored in a single transceiver of a fixed station and a mobile station, and after reception is completed, a relay signal is added to the stored contents of the call. A wireless relay system characterized by having a logic section that transmits data to the next station, and performing multi-stage relay at the first transceiver.