JPH07288868A - Cordless telephone system - Google Patents

Abstract

PURPOSE:To set inter-slave set direct speech mode without special operation by providing a control means setting automatically the direct speech standby mode between slave sets when a state of undetection of a master set identification code by a detection means is counted for a prescribed time. CONSTITUTION:When a power key of a key entry section 13 is applied, a timer 14 is reset to an initial value and the clock is started newly. A CPU 11 allows a radio control section 16 to scan sequentially indoor control channels. The control section 16 uses a radio communication section 21 to make reception by a frequency of the preset indoor control channel and informs reception signal information to the CPU 11. The CPU 11 discriminates whether or not the its own identification signal of a master set in the registration state coincident with an identification signal is in existence in the signal information from the control section 16. When the CPU 11 discriminates it that the identification signal is in existence, the CPU 11 establishes a super-frame from an information element of a reception signal and waits a call from the master set. Thus, the inter-slave set direct speech mode is set without any special operation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone system for making direct calls between a plurality of handsets.

[0002]

2. Description of the Related Art There is a cordless telephone system having a plurality of cordless handsets, which has a direct call function between the cordless handsets for directly making a call between the cordless handsets without using a cordless handset connected to a public line. . When making a direct call between the slaves, the mode of the direct call is selected by operating the mode switch from the normal standby state on the slave side. Therefore, when these handset units are used outdoors, for example, like a transceiver, or when they are brought back from the outdoors and reenter the normal standby state at home, the mode switches must be operated. There was a problem that the operation was troublesome.

[0003]

As described above, in the conventional cordless telephone system, it is necessary to operate the mode switch when shifting to the direct call mode between the handset units and when returning to the normal standby mode. There was a problem that operation became troublesome.

The present invention has been made in view of the above circumstances, and its purpose is to allow a user to easily switch to a direct communication mode between handset units without any special operation. It is to provide a cordless telephone system capable of returning to the standby mode.

[0005]

That is, the present invention is a cordless telephone system having a base unit and a plurality of handset units, and detecting means for detecting the identification code of the base unit in a received signal and the detection means. Means for measuring a state in which the identification code of the master unit is not detected for a certain period of time, and a standby mode for a direct call between the slave units is automatically set when the certain period of time is measured by this timing unit, while detecting the above Each slave unit is provided with a control unit for automatically canceling the standby mode of the direct communication between the slave units when the identification code of the master unit is detected by the means.

[0006]

With the above-mentioned configuration, the portable unit is automatically brought into the direct call mode between the portable units by taking the portable unit to a place away from the parent unit without performing any special operation, and these portable units can also be operated. It is possible to return to the normal standby mode by taking the machine home near the master machine.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a PHP (personal handy phone) will be described below with reference to the drawings. FIG. 1 shows the configuration of an electronic circuit of one child device, and 11 is a CPU that controls the operation of each of the other circuits.
The CPU 11 includes a display unit 12 for displaying various information, a power input key, a key input unit 13 including a dial button for dialing, a mode key, a function key, and the like.
It is connected to a timer 14, a converter unit 15 including an A / D converter and a D / A converter, and a wireless control unit 16 that controls the operation in wireless communication.

The timer 14 is reset and activated by the CPU 11 to measure a preset time, and when this time is reached, a time-up signal is sent to the CPU 11.

Under the control of the CPU 11, the converter section 15 performs modulation / demodulation for a microphone 17 as a transmitter, a speaker 18 as a receiver, a speaker 19 for amplifying a ringer tone (calling sound), and a digital voice signal. A / D conversion and D / A conversion are performed with the speech codec unit 20.

The speech codec section 20 is a converter section.
Digital audio signal sent from 15 is encoded (ADP
(CM voice signal) and sends it to the wireless controller 16, while decoding (PCM voice signal) the received signal sent from the wireless controller 16 to obtain a digital audio signal, which is sent to the converter unit 15. .

The radio control unit 16 performs TDMA processing.
That is, under the control of the CPU 11, the speech codec section
Various control signals are added to the digital audio signal from 20 to create transmission data, scrambled, etc., and then unique words (synchronization signals) etc. are added to format and inserted at a predetermined timing of the TDMA frame. Output to the wireless communication unit 21. In addition, the unique word is extracted from the received data sent from the wireless communication unit 21 to synchronize the frame, and the control data unit and the voice data unit in the received data are descrambled to obtain the control data. Is sent to the CPU 11, and the voice data is transferred to the speech codec unit 20.

The wireless communication unit 21 performs π / 4 QPSK modulation processing on the transmission data sent from the wireless control unit 16,
After frequency conversion to a predetermined frequency, while transmitting at a transmission timing (controlled by the wireless control unit 16) from the antenna 22 to another slave device or master device not shown,
After the frequency of the received signal captured from the antenna 22 at the reception timing (controlled by the wireless control unit 16) is converted into an IF signal (intermediate frequency signal), the π / 4QPSK demodulation processing is performed to receive the received data. Transfer to.

Next, a mode setting operation mainly controlled by the CPU 11 will be described. Figure 2 shows the key input section
The contents of the mode setting process after the operation of the power key 13 are shown. First, when the power key is turned on, the timer 14 is first reset to the initial value, and then the timer 14 is restarted (step S1).

Next, the CPU 11 instructs the wireless controller 16 to
Indoor control channel (shown as "private CCH" in the figure)
Are sequentially scanned (step S2). Wireless controller 16
Causes the wireless communication unit 21 to perform a receiving operation at a preset frequency of the indoor control channel, and notifies the CPU 11 of the received signal information. The CPU 11 determines whether or not the signal information from the wireless control unit 16 matches the identification signal of its own parent device set at the time of registration, that is, whether or not the signal from the parent device is received. It is determined (step S3).

Here, FIG. 3 illustrates an experimental frequency in PHP. The value of the frequency used is for experimental purposes only, and may differ from the frequency actually used. In the figure, 1895 MHz to 1906.
About 11MHz between 1MHz indoor, 1906.1M
Allocate 12 MHz between Hz and 1918.1 MHz for outdoor use, and allocate a total of 40 channels including 35 channels for indoor communication + 2 channels for control, 37 channels in total, and 2 channels for control for outdoor use. I shall. Then, in the indoor frequency band, as indicated by hatching in the figure, 1895 MHz to 1898 MH
It is assumed that 3 MHz between z and 10 channels in terms of the number of channels are allocated for direct communication between the handset units.

The two indoor control channels are 1
898.45 MHz and 1900.25 MHz are allocated. However, the scanning of the indoor control channel in step S2 is performed by sequentially scanning 1898.45 MHz and 1900.25 MHz.

When the CPU 11 determines that the signal number from the wireless control unit 16 includes the identification number that matches the identification signal of the master unit, the super frame is established from the information element of the received signal (step S4). Then, a call from the master unit is set in a standby state (step S5), and thereafter, the operations of steps S1 to S5 are repeated.

If the CPU 11 determines in step S3 that the signal number from the wireless controller 16 is not the identification number that matches the identification signal of the master unit, then the time value of the timer 14 is preset. In addition, it is determined whether or not a fixed value has been reached, that is, whether or not a fixed time has elapsed with the signal that should be sent from the parent device being interrupted (step S6).

When it is determined that the time value of the timer 14 has not reached the preset constant value, the CPU 11 causes the timer
After updating and setting the time count value of 14 (step S8), the processes from step S2 are repeated thereafter.

Further, when it is determined in step S6 that the time value of the timer 14 is a preset constant value, and the constant time has passed with the signal that should be sent from the master unit being cut off. Automatically sets the direct call mode between handset units, assuming that the handset unit has been taken out of the outdoors for a certain period of time, and the 1895MH shown by hatching in FIG.
By scanning 3 MHz and 10 channels from z to 1898 MHz in sequence, communication from another slave is awaited (step S7), and thereafter the processing from step S1 is repeated. At this time, the interval for scanning the self-employed CCH is lengthened.

Further, when the signal including the identification number that matches the identification signal of the master unit is received in the state where the direct communication mode between the slave units is set as described above and it is judged (steps S2 and S3), The CPU 11 establishes the super frame from the information element of the received signal (step S4), immediately cancels the direct call mode between the slave units, automatically sets the normal standby mode again, and waits for a call from the master unit. (Step S5) After that, the operations of the above steps S1 to S5 are repeated.

Next, a specific example of the identification signal included in the signal from the master unit will be described. The channels used in the protocol phase are the logical control channel LCCH, which is a generic term for the channels used by the base station (master device) and the mobile station (slave device) in the link channel establishment phase, and the base station and mobile station in the service channel establishment phase. There are a link channel LCH, which is a generic term for channels used, and a service channel SCH, which is a generic term for channels used by a base station and a mobile station in a communication phase.

In the logical control channel LCCH, a broadcast channel BCCH, which is a downlink unidirectional channel for broadcasting control information from a base station to a mobile station, is provided as a functional channel.
A point-to-point bidirectional channel that transfers information necessary for call connection between the base station and the mobile station, and a dedicated cell channel SCCH that transfers independent information for each connection, and from the base station to the mobile station. On the other hand, a paging channel PCH, which is a point-multipoint downlink unidirectional channel for simultaneously transmitting the same information to a wide area (paging area) of a single cell or a plurality of cells, and other channels are used.

The logical control channel LCCH has a superframe structure and is used for intermittent transmission of a base station (base station) or a dedicated cell channel SCCH upstream slot (slot: TD).
A collection of bit strings corresponding to physical channels multiplexed on the time axis of the MA method. In the PHP system, one slot is set to 0.625 [ms]. ) Transmission and reception are all generated based on the superframe. That is, the minimum period of the downlink logical control channel LCCH that specifies the slot positions of all LCCH elements is defined as an LCCH superframe.

FIG. 4 exemplifies the structure of this LCCH superframe. The broadcast channel BCCH (BC) is a downlink LCCH element, and the paging channels PCH (P1 to Pk: grouping number = corresponding to all incoming groups). k)
And a fixedly inserted dedicated cell channel SCCH
(SC) and USCCH (optional, not shown here) shall be used.

In the figure, the LCCH interval value n is a value indicating the period of intermittent transmission of the LCCH slot by the base station as the number of TDMA frames in the intermittent period, and the frame basic unit length nSUB is BCCH, SCCH (downlink) or USCCH.
Length of LCCH superframe component composed of (downstream) and PCH, number of same incoming call groups nSG is the number of PCHs belonging to the same incoming call group included in one superframe, PC
The H number nPCH is the number of PCH signal elements in the basic frame unit, and the incoming grouping factor nGROUP is a multiple of the PCH number nPCH.

Therefore, the broadcast channel BCCH, the dedicated cell channel SCCH, and the paging channel PCH are used.
The configuration of each basic physical slot (P1 to P6) is illustrated in FIG. In the figure, each numerical value indicates the number of bits, PR is preamble information, CI is channel type information, I is data information, CRC is cyclic code information, and calling identification code information is the calling code of the local station (slave unit). It is assumed that the destination identification code information includes the calling code of the partner station (master device) to be connected.

However, the calling identification code information is the same as that shown in FIG.
It corresponds to the identification signal of the base unit used as the judgment reference in step S3 of step S3, and the normal standby mode and the handset unit are selected depending on whether or not this calling identification code information matches the preset identification signal of the base unit. One of the inter-direct call modes is automatically set.

Although the above-mentioned embodiment illustrates the case where the present invention is applied to PHP, the present invention is not limited to this, and a plurality of slave units capable of discriminating the identification signal in the radio signal emitted by the master unit. Needless to say, any cordless telephone system having the above can be easily applied.

[0030]

As described above, according to the present invention, the portable unit is automatically brought into a direct call mode between the portable units by carrying out the portable unit to a place away from the parent unit without performing a special operation, Further, it is possible to provide a cordless telephone system capable of returning to the normal standby mode by bringing these slave units near the master unit.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration according to an embodiment of the present invention.

FIG. 2 is a flowchart illustrating a processing operation according to the embodiment.

FIG. 3 is a diagram for explaining the operation according to the embodiment.

FIG. 4 is a view for explaining the operation according to the embodiment.

FIG. 5 is a view for explaining the operation according to the embodiment.

[Explanation of symbols]

11 ... CPU, 12 ... Display unit, 13 ... Key input unit, 14 ... Timer, 15 ... Converter unit, 16 ... Wireless control unit, 17 ... Microphone,
18, 19 ... speaker, 20 ... speech codec section, 21 ... wireless communication section, 22 ... antenna.

Claims (2)

[Claims] 1. A cordless telephone system having a base unit and a plurality of handset units, wherein the detecting unit detects the identification code of the base unit in a received signal, and the identification code of the base unit by the detecting unit. Each slave unit is equipped with a timekeeping means for timing a non-detected state for a certain period of time, and a control means for automatically setting a standby mode for a direct call between the slave units when the certain period of time is measured by the timekeeping means. Characteristic cordless telephone system. 2. The control means further comprises a canceling means for automatically canceling the standby mode of the direct communication between the slaves when the detecting means detects the identification code of the master. Cordless telephone system.