JPH0955981A - Phs system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable simultaneous waiting for inter-slave set direct communication at the time of a public mode or a private mode by providing a means for controlling a frequency and a timing by which a signal from another slave is received at a specified timing in the slave set. SOLUTION: The control part of the slave set controls the timing and the frequency of communication. In the radio wave signal a TDMA-TDD system, the timing and the frequency for receiving the signal from a master set on a time axis are different from those of inter-slave set communication. The timing 19 is the timing of the signal from the master set (public base station) like the timing 18. But the timing 20 for searching the calling signal from another slave set is received after that, so that the calling signal between the slave sets can be received even while waiting the signal from the master set. This searching timing 20 does not necessarily come after the timing 19 and it can exist at every decided time in the timing 19. The frequency is also controlled by the timing 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital cordless telephone device, and more particularly to a PHS system that enables direct communication between handset devices.

[0002]

2. Description of the Related Art A PHS is a cordless telephone device of a digital system, and the function of the telephone device is a self-employed mode for communicating with a base unit in a home or office or a public base station installed outdoors. In addition to the public mode, there is an inter-slave communication mode in which the slaves directly communicate with each other. In this PHS system, digital signals are communicated at timing of time division multiplexing (TDMA-TDD system). At this time, because the standby timing and frequency in the self-employed mode or public mode and the standby timing and frequency in the inter-slave communication are different, even if the call is made in the inter-slave communication during the self-employed mode or public mode, the call is not performed. It cannot be detected by the called slave unit, and communication between slave units cannot be started.

[0003]

In the above-mentioned conventional technique, in order to perform direct communication between the handset units, it is necessary to enter a direct communication mode between the handset units which is completely different from the public mode and private mode of the public or home. Since it must be, it is not possible to simultaneously wait for a call from a public base station or a self-employed master unit and a direct call from a slave unit.

[0004]

According to the PHS system of the present invention, before the reception of the next signal from the master unit or the public base station is started after the timing of receiving the signal from the master unit or the public base station is ended, Alternatively, the slave unit may be provided with means for controlling frequency and timing so as to receive a signal from another slave unit at a timing after a predetermined number of times of receiving a signal from the master unit or public base station. is there.

[0005]

1 shows the configuration of a PHS system according to an embodiment of the present invention, which is composed of a master unit or a public base station and a slave unit, and a master unit (public base station) and a slave unit. A TDMA-TDD system digital signal can be communicated between a device and a child device. The cordless handset has display units 1 and 7 for displaying information on each incoming and outgoing call, and operation units 4 and 10
Enter the number for calling and receiving. Also,
Information is output as a wireless signal by the wireless units 3 and 9, and the wireless signal is output to the actual air by the antennas 5 and 11. Further, the slave unit has speakers 6 and 12 for transmitting sound information to the user, and the control units 2 and 8 control the entire operation. The control units 2 and 8 control the timing and frequency of the direct communication 16 between the slaves and the communication 17 with the master. on the other hand,
The master unit has a control unit 14 that performs control for communicating with the slave unit, a wireless unit 13 that creates a wireless signal, and an antenna 15 that outputs the wireless signal.

FIG. 2 shows the timing of radio signals in the TDMA-TDD system. Reference numeral 18 indicates a signal reception timing on the time axis from the master unit, and the timing and frequency are different from those of the inter-slave unit communication. Timing 1
9 is the timing of the signal from the base unit similar to the timing 18, but by providing the timing 20 for searching for the call signal from another handset after that, the call signal between the handset units even while waiting for the signal from the base unit Can be received. The timing 20 does not always follow the timing 19, but can be present at a predetermined number of times of the timing 19. Also, timing 2
The frequency is also controlled at 0.

FIG. 3 shows the operation at the timing of FIG. 2. At the reception timing of 21, at 22 the signal from the base unit is analyzed, at 23 the signal is judged, and if there is a call, 26 The communication operation with the master unit of is shifted to. Reference numeral 24 denotes a flow in which a signal search and analysis from a slave unit is performed, and when a signal is judged at 25 and a call is made, a transition is made to a communication operation between the slave units 27.

[0008]

As described above, according to the present invention, it is possible to receive a direct call from the slave unit even in the self-employed or public mode in which the signal of the master unit or the public base station is awaited.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of the present invention.

FIG. 2 is a diagram showing a timing according to the present invention.

FIG. 3 is a flowchart showing the main operation of the child device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 display part 2 control part 3 radio part 4 operation part 5 antenna 6 speaker 7 display part 8 control part 9 radio part 10 operation part 11 antenna 12 speaker 13 radio part 14 control part 15 antenna

Claims (1)

[Claims] 1. A signal is received from the master unit or the public base station before the next signal reception from the master unit or the public base station is started after the timing of receiving the signal from the master unit or the public base station is ended. A PHS system, wherein the slave unit is provided with means for controlling frequency and timing so as to receive a signal from another slave unit at a timing after a predetermined number of times after the timing.