JPH07162937A - System for managing and controlling reception units of plural fixed stations - Google Patents

Abstract

PURPOSE:To prevent speaking quality from being lowered at the time of press talk speaking by collecting electric field detection data from respective slave station fixed stations at a main fixed station and opening a channel while instantaneously selecting any reception unit which satisfies conditions. CONSTITUTION:A processor 23 reads digital received electric field data detected and stored periodically from a RAM 24, compares them with an electric field level threshold value stored in an E PROM 25 and stores the result in the RAM 24 as the electric field detection data. On the other hand, the processor 23 periodically performs the tone detection of each reception unit 5 and stores the result in the RAM 24 as tone squelch detection data. A manipulator provided at the main fixed station opens the channel by instantaneously selecting the reception unit satisfying the conditions corresponding to the electric field detection data collected from the respective slave station fixed stations, channel switching instruction and further the tone squelch detection data. Thus, speaking quality can be prevented from being lowered at the time of press talk when operating the system of plural fixed stations.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiving unit management control system for a plurality of fixed stations in a 1 mW work local communication system.

[0002]

2. Description of the Related Art A local communication system for 1 mw work is 40
One of the 0MHz band low-power premises radios, a main station fixed station that has an operating unit, a plurality of slave station fixed stations that are connected to the main station fixed station by wire and are distributed in the premises, and a few people moving on the premises To a mobile device (hereinafter referred to as a mobile device) carried by a dozen or more workers, respectively, and it is possible to talk between the operating device, the mobile device, and the mobile devices. Call channels and tone squelch tone frequencies are assigned to the mobile devices, respectively, so that one-to-one calls can be made individually. However, it is preferable to allow other people's calls to be intercepted for work communication. It also has a conference call function. Main station,
Each fixed station as a slave station has a receiver equipped with a plurality of single-channel receiving units corresponding to the number of portable devices and corresponding to the channels used, and its reception demodulation output as a modulated wave. A transmitting device for transmitting a wireless signal to a portable device of a communication partner or all portable devices is provided.

FIG. 1 is a block diagram of a conventional 1 mW work local communication system. The fixed stations 2 and 3 are also provided with a transmitter, but they are not shown. In the 1 mW work premises communication system, the main station fixed station 2 and the slave station fixed station 3 are in the wireless section of the portable device 1 and the wired section of the operation unit (wireless terminal) 4 provided in the main station fixed station 2 (the call line 8 And the communication line control via the data line 9) according to the following procedure. (1) The portable device 1 in the zone C transmits a call channel frequency signal assigned to itself and a tone squelch tone to the fixed stations 2 and 3 as a call request. (2) Portable device 1 in the plurality of receiving units 5 of each fixed station
The receiving unit of the communication channel frequency corresponding to the above-mentioned unit receives and detects the communication channel signal and the tone, respectively. (3) The processor 6 provided in each fixed station controls the reception unit selection means 7 to receive each of the reception units (1) to (1).
A receiving unit that periodically searches the detection status of the communication channel frequency and tone of (n) by a polling method, and detects the allocated communication channel frequency signal and tone of which received field strength (RSSI) is equal to or more than a threshold value. On the other hand, the communication path between the operation device 4 and the portable device 1 is opened by the receiving unit selection means 7. (4) A zone switching request occurs when the reception field strength (RSSI) drops, and the master station issues a reception field data measurement request to all slave stations and switches to the slave station of the receiving unit with the maximum field strength detected. To do.

[0004]

However, the above conventional control method has the following problems. (1) Portable device 1 in zone C where zone A and zone B overlap
When selecting any of the adjacent fixed stations provided with the receiving unit having the same speech channel frequency and the same tone frequency, it takes time to connect the speech path due to the polling method. (2) Furthermore, since the master station fixed station 2 centrally manages the communication path control of the receiving unit of the slave station fixed station 3 by the polling method each time the press talk call (PTT) is performed,
There has been a problem that the call quality is deteriorated by the press talk call (PTT).

An object of the present invention is to solve the deterioration of the call quality during a press talk call, and the master fixed station 2 centrally manages the slave fixed station 3 by using the difference between the call channel frequency signal and the tone detection timing. An object of the present invention is to provide a receiving unit management control system of a plurality of fixed stations, which can shorten the switching connection processing time and instantaneously selectively connect the receiving unit of the maximum receiving level.

[0006]

A receiving unit management control system for a plurality of fixed stations according to the present invention is a main station fixed station and a plurality of slave station fixed stations which are connected to the main station fixed station by wire and are distributed in a premises. And a plurality of portable devices that communicate with each other via either the master station fixed station or the plurality of slave station fixed stations in the premises, and each of the master station fixed station and the plurality of slave station fixed stations , A plurality of single speech path receiving units corresponding to each of the plurality of portable devices to which a radio channel frequency and a tone squelch tone frequency are respectively allocated, the main station fixed station being operated by the operator In a receiving unit management system of a plurality of fixed stations for controlling connection switching between communication paths between portable devices, the plurality of receiving units are provided for each of the main station fixed station and the plurality of slave station fixed stations. First RAM and, EEPROM for previously storing the reception electric field level of the threshold of the plurality of receiving units for storing the received electric field level in the digital conversion
And a second RAM for storing electric field detection data indicating whether the received electric field level is higher or lower than the threshold value.
And a third RAM for storing tone detection data indicating whether or not there is tone detection of the plurality of receiving units,
The received electric field levels of the plurality of receiving units and the electric field detection data for detecting the tone output periodically;
An operating device provided in the main station fixed station, comprising: a processor for storing the tone detection data in the second RAM and a processor for storing the tone detection data in the third RAM, respectively; The electric field detection data is collected from the slave fixed station and the control for opening the communication path is performed according to three conditions of the electric field detection data, the tone detection data, and the communication path switching instruction. .

That is, the gist of the technical means of the present invention is as follows. The RAM 24 of each fixed station is provided with a memory area for storing the received electric field level of each receiving unit.
An area for storing the reception electric field level threshold value of each receiving unit is provided in the E ² PROM 25 of each fixed station. A memory area for storing the electric field detection data is provided in each fixed station. A memory area for storing tone detection data is provided in each fixed station.

[0008]

FIG. 2 is a block diagram of a fixed station and a memory content diagram for realizing the system of the present invention, and FIG. 3 is an operation flowchart of the present invention. The control method of the present invention will be described with reference to FIGS. (1) The value of the reception electric field level threshold value of each reception unit 5 is stored in the E ² PROM 25 in advance as shown in FIG. (2) The processor 23 periodically converts the received electric field level detected by the plurality of receiving units 5 (1) to (5) by the receiving unit control means 21 into a digital value by the A / D converter 22 and then performs the digital reception. The electric field data is stored in the RAM 24 as shown in FIG. (3) The processor 23 reads the stored digital received electric field data from the RAM 24, and the E ² PROM 25
2D is compared with the electric field level threshold value stored in the electric field level threshold value, and the result is converted into bit data of "1" with electric field and "0" without electric field, and as electric field detection data, as shown in FIG. To store.

FIG. 4 is a timing chart when the PTT is pressed when performing a press talk call (PTT), and FIG. 5 is a call path control protocol. (4) As shown in FIG. 5, the fixed station of the master station collects the electric field data and performs the communication path control process with respect to the fixed station of the slave station during the difference T ₁ between the electric field detection timing and the tone detection timing. (5) The transmission time T ₃ between the master station fixed station and the slave station fixed station is T
The timing of ₁ and the processing time of each fixed station shall be considered. Therefore, each processing time T _A is expressed by the following equation.

[0010]

[Equation 1] (6) The master station fixed station transmits an electric field transmission request signal from its operating unit to the slave station fixed station. Upon receiving this, the slave fixed station transmits the electric field detection data. (7) The master station side that receives the electric field detection data collects the call status of each slave fixed station, detects a tone, and sends a call path switching instruction to the slave fixed station of the receiving unit that has the electric field detection data. .

FIG. 6 is a system block diagram of tone squelch detection and a detection data configuration diagram, and FIG. 7 is a tone squelch detection flowchart. (8) The processor 23 periodically performs the tone detection of each receiving unit 5 by the receiving unit control means 21. (9) The tone detection result is shown in FIG.
As shown in (B), it is converted into bit data of "1" with tone detection and "0" without tone detection and stored in the RAM 24 as tone squelch detection data. (10) The operation unit 4 provided in the main fixed station makes a call by momentarily selecting a receiving unit that meets the conditions based on the electric field detection data collected from each fixed station, the call path switching instruction, and the tone squelch detection data. Open the road. That is, the communication path opening (connection) conditions are the electric field detection data (6), the communication path switching instruction (7), and the tone squelch detection data (9).

[0012]

As described above, according to the present invention, it is possible to prevent the deterioration of the call quality during press talk when the plural fixed station system of the 1 mW work local communication system is operated. Further, it is possible to prevent the deterioration of the call quality at the time of zone switching due to the movement of the portable device.

[Brief description of drawings]

FIG. 1 is a conventional system block diagram.

FIG. 2 is a block diagram and a memory content diagram for explaining reception electric field level detection of the present invention.

FIG. 3 is a reception electric field detection flowchart of the present invention.

FIG. 4 is a timing chart when the PTT is pressed in the press talk call of the present invention.

FIG. 5 is a speech path control protocol of the present invention.

FIG. 6 is a block diagram and a data configuration diagram for explaining tone squelch detection of the present invention.

FIG. 7 is a flowchart of tone squelch detection according to the present invention.

[Explanation of symbols]

1 portable device 2 main station fixed station 3 slave station fixed station 4 operating unit 5 receiving unit 6 processor 7 receiving unit selecting means 8 call line 9 data line 21 receiving unit selecting means 22 A / D converter 23 processor 24 RAM 25 E ² PROM

Claims (1)

[Claims] 1. A master station fixed station, a plurality of slave station fixed stations connected to the master station fixed station by wire in a distributed manner on the premises, and any of the master station fixed station or the plurality of slave station fixed stations on the premises. It is composed of a plurality of portable devices that communicate with each other via or, the plurality of the plurality of mobile station fixed station and each of the plurality of slave station fixed station, the radio channel frequency and the tone frequency for tone squelch are respectively assigned. Management of a plurality of fixed stations, each of which is provided with a plurality of reception units for a single communication path corresponding to each of the portable devices, and the main station fixed station controls connection switching of the communication paths between the plurality of portable devices by an operation unit In the method, in each of the master station fixed station and the plurality of slave station fixed stations, a first RAM for digitally converting and storing the received electric field levels of the plurality of receiving units; E for previously storing the reception electric field level of the threshold of the plurality of receiving units
An EPROM and a second electric field detecting data for indicating whether the received electric field level is higher or lower than the threshold value
RAM and a third R for storing tone detection data indicating whether or not there is tone detection of the plurality of receiving units.
AM, the received electric field levels of the plurality of receiving units and the tone output are periodically detected, and the electric field detection data and the tone detection data are respectively supplied to the second R.
AM, a processor for storing in the third RAM, the controller of the master station fixed station collects the electric field detection data from the plurality of slave station fixed stations each time there is a reception from the portable device, A receiving unit management system for a plurality of fixed stations, characterized in that control for opening a communication path is performed according to three conditions of the electric field detection data, tone detection data, and communication path switching instruction.