KR0117393Y1 - Trs - Google Patents

Abstract

The present invention relates to a frequency common system. In particular, when a call is terminated between a terminal and a repeater, the portable device transmits the low-speed data of the call termination to the repeater and ends the repeater in use even if the field strength is high due to mutual interference by adjacent channels. The present invention relates to a frequency common system that can be used efficiently.

To this end, in a frequency sharing system in which one frequency is shared and wirelessly communicates with a terminal in a repeating period, the terminal transmits low-speed data of about 150 Hz to a repeater when the terminal terminates a call, and receives the low-speed data at the repeater. It is a frequency common system, characterized in that by terminating the repeater to stop the call.

Description

Frequency common system

1 is a block diagram of a frequency common system

2 is a block diagram of a repeater of a frequency common system

3 is a block diagram of the main control unit inside the repeater

4 is a flowchart illustrating the operation of the frequency common system according to the present invention.

Explanation of symbols on the main parts of the drawings

N1, N3: Network N2: Network Switch (RNS)

N4: PSTN P1 ~ Pn: Terminal

The present invention relates to a frequency common system. In particular, when a call is terminated between a terminal and a repeater, the portable device transmits the low-speed data of the call termination to the repeater, and when the repeater is in use even when the field strength is high due to mutual interference by adjacent channels, The present invention relates to a frequency common system that can be used efficiently.

In general, the frequency common system is a terminal (P1 ~ Pn) that allows the user to talk wirelessly within the coverage area, the repeater (B1 ~ B2) for connecting it by wireless communication, and a plurality of network switch (RNS) connected by wire ( N2), a wired call line and a data network are formed with the network switch N2, and a private loop N4 and a subscriber loop are connected to each other.

1 is a block diagram of a frequency common system, in which a plurality of terminals P1 to Pn are connected to repeaters B1 to Bn through a wireless communication line, and the repeaters B1 to Bn are wired call circuits and data networks N1. It is connected to the network switch (N2) as the main control device, the network switch (N2) is connected to the private switch (N4), a plurality of subscriber loop between the network switch (N2) and private switch (N4) (N3) is connected.

2 is a block diagram showing the repeaters B1 to Bn of the frequency common system in more detail, the main controller 60, the antennas 21 and 22, the transmitter 23, the receiver 24, and the duplexer 20. And a plurality of high frequency units 80a to 80n including a frequency synthesizer 25 and 26, a data demodulator 28, a data modulator 27, an EEPROM 29 and a controller 60. In connection with the interface of 23, the voice data and data signal of the hybrid 61 and the data signal of the interface communicate with the network switch N2 via the network N1 of the wired call circuit.

3 is a block diagram showing the configuration of the network switch N2 in the frequency common system, wherein the switch W31 connects the wired line between the private switch N4 and the repeaters B1 to Bn. The other end of the switch unit 31 is connected to a data network N3 of a wired call line, and one end of the switch unit 31 has a memory 34 for data communication with the repeaters B1 to Bn. The data network control unit 32 controlled by the program of () is connected, and is connected to the repeaters (B1 to Bn) through the data network (N1).

In addition, the data network controller 32 is connected to the user interface 35 to perform system control and data input / output functions, and the memory 34 includes a group identification code, a repeater (B1 to Bn) identification code, and a portable device identification code. It stores data for subscriber control and other system control.

In the frequency sharing system as described above, when a subscriber wants to make a short call, the subscriber connects to one of the plurality of repeaters B1 to Bn through a wireless communication circuit to an arbitrary terminal P1 to Pn, and then to a desired terminal P1 to Pn. ), And when the subscriber makes an outside call, the subscriber is connected to one of the plurality of repeaters B1 to Bn through a wireless communication circuit from any terminal P1 to Pn and then the repeater B1 to The call is enabled by way of a network switch N2 and a private switch N4 via a subscriber loop connected to Bn).

On the other hand, the incoming call from the outside is connected to the repeaters (B1 ~ Bn) through the subscriber loop and received at the terminals (P1 ~ Pn) via a wireless communication circuit between the repeaters (B1 ~ Bn) and the terminals (P1 ~ Pn), The transmissions of the terminals P1 to Pn are transmitted through the other repeaters B1 to Bn.

In the conventional common frequency system, the repeater measures the field strength received from the terminal and compares it with the reference level. When the field strength is less than the reference level, the repeater determines that the call is completed and executes the call termination. In this case, when the reception field strength exists due to mutual interference of adjacent channels and measured above the reference level, the repeater is judged to be in a busy state and other subscribers cannot use it, thereby reducing the reliability of the frequency common system.

In order to solve the above problems, the present invention transmits low-speed data of about 150 Hz to a repeater when a terminal terminates a call, and is used even when the field strength is high due to mutual interference by adjacent channels when receiving the low-speed data at the repeater. It is to provide a frequency common system that can be used efficiently by providing a call channel to other subscribers by terminating the repeater.

The present invention is a frequency common system using one frequency in common and wireless communication in the relay period with the terminal, when the terminal terminates the call to transmit the low-speed data of about 150Hz to the repeater, the low-speed data receiving at the repeater The call was terminated by stopping the call.

Hereinafter, described in detail by the accompanying drawings as follows.

The configuration of the frequency common system according to the present invention is made the same as before. 1 is a block diagram of a frequency common system, in which a plurality of terminals P1 to Pn are connected to repeaters B1 to Bn through wireless communication lines, and the repeaters B1 to Bn are wired call circuits and data networks. It is connected to the network switch (N2) that is the main control device through N1), the network switch (N2) is connected to the private exchange (N4), a plurality of subscribers between the network switch (N2) and private exchange (N4) Loop N3 is connected.

FIG. 2 is a block diagram showing the repeaters B1 to Bn of the frequency common system in more detail. FIG. 3 is a block diagram of the network switch N2 in the frequency common system, which is the same as the conventional configuration. An operation flowchart of the frequency common system according to the present invention.

The operation of the frequency common system as described above is described in detail with reference to FIG. 4. First, when the terminals P1 to Pn and the repeaters B1 to Bn are in a call connection state (step 101), a call is made with the other party. (Step 102), when the call is in communication with the other party, data is transmitted and received between the terminals P1-Pn between the repeaters B1-Bn (step 103).

At this time, the terminal P1 to Pn determines the end of the call (step 104), and at the end of the call, transmits 150 Hz end data from the terminals P1 to Pn to the repeaters B1 to Bn (step 105). As the repeaters B1 to Bn receive the 150 Hz low speed end data transmitted from the terminals P1 to Pn (step 106), the repeaters B1 to Bn serving as the relays are connected to the terminals P1 to Pn. It is determined that the end of the repeater (B1 ~ Bn) to provide a call channel to other subscribers.

As described above, the present invention transmits the low-speed data of 150 Hz to the repeater when the terminal terminates the call, and the repeater used even when the field strength is high due to mutual interference by the adjacent channel when the low-speed data is received from the repeater. In this way, by providing a call channel to other subscribers, the system can be effectively used to improve the reliability of the frequency common system.

Claims (1)

In the frequency common system using one frequency in common and talking wirelessly with the terminal in the relay period, When the terminal terminates the call, the low-speed data of about 150 Hz to the repeater, And terminating the call by terminating the repeater when the low speed data is received by the repeater.