JP3111847B2 - Synchronization establishment method for digital radio telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synchronization establishing method for establishing synchronization between a master unit and a slave unit in a digital radio telephone apparatus comprising a master unit and a slave unit.

[0002]

2. Description of the Related Art This type of digital radio telephone apparatus comprising a master unit and a plurality of slave units and performing wireless communication by time division multiple access between the master unit and each slave unit is known as a PHS (Personal Handy Phone System). , One frame of data is divided into eight time slots, and wireless communication is performed via each of the divided time slots. Of the time slots, four slots are allocated to the transmission time slot from the parent device to each child device, and the remaining four time slots are transmission time slots from each child device to the parent device (for the parent device, reception time slots are received). Time slot). Therefore, theoretically, if all eight slots of one frame are used by using one wireless device, the master device can perform wireless communication simultaneously with the four slave devices.

In a digital radio telephone apparatus for performing radio communication by such time division multiple access, a plurality of control channels and communication channels having different signal carrier frequencies are defined separately from the above-mentioned time slots. . Then, the master unit and each slave unit establish synchronization in advance via the control channel, and when a call is generated in the device,
First, after transmitting and receiving control data via the control channel, the communication is shifted to a call using the communication channel.

[0004]

A master unit used in such a digital radio telephone apparatus is roughly classified into a master unit for self-employment such as for home use and business use, and a master unit for public use (public base station). In addition, there are three types of base units for public use as public base units. Since the control channel information used in each of the master units and the time slots for communicating the information are different from each other, a single slave unit may establish synchronization with all of the various master units. Nothing has been done. For this reason, a dedicated slave unit is required for each type of master unit, but this is uneconomical, so one slave unit can be switched between self-service and public by, for example, a changeover switch. It is conceivable to use it by switching. However, in the case of such a switching method, it is impossible to call a slave unit that has been switched to the private use through a public master unit, and also to a slave unit that has been switched to the public. On the other hand, there is a problem that it is impossible to make a call via the parent device for private use, and therefore, there is a disadvantage that the child device cannot receive necessary incoming calls for both private use and public use.

Accordingly, the present invention makes it possible to call one slave unit from a plurality of master units without switching the slave unit for each of private use and public use. The purpose is to be able to answer the necessary incoming calls.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a time-division multiplexing system for accommodating a wired telephone line and transmitting a control signal and a voice signal through a plurality of transmission and reception time slots. In a digital wireless telephone device including a master unit having a control channel and a communication channel for performing wireless communication by connection and a slave unit wirelessly connected to the master unit, the slave unit differs from the plurality of master units. provided an intermittent synchronization establishing means for transmitting and receiving intermittently synchronization burst via a respective time slot of the control channel over a time period, the intermittent synchronization establishing means, different times whether the synchronization burst transmitted from a plurality of base unit Detecting means for detecting via a reception time slot in a period; and an identification code included in the synchronization burst detected by the detecting means. If it is determined, the transmitting means for transmitting the synchronous burst to which the identification code of the own station is added via the transmitting time slot after the predetermined time slot counted from the receiving time slot receiving the synchronous burst, and the synchronous signal detected by the detecting means. When the burst is a synchronous burst addressed to the own station, a storage means for storing the identification code of the base station included in the synchronous burst in association with the reception time slot .
It is configured . In addition, each call charge corresponding to the unit talk time of each wired line accommodated in each master unit is registered in advance in the slave unit, and the slave unit receives the wired line with the lowest call charge when a predetermined operation is performed. The selected parent device is selected and a call is transmitted via the parent device.

[0007]

[Action] slave unit, the presence or absence of synchronization bursts transmitted multiple base unit or we detected via the reception time slot in different time periods, respectively, it is the synchronization burst from the identification code included in the detected synchronization burst itself If it is determined to be addressed to the station, synchronization is established by returning the synchronization burst to which the identification code of the own station has been added to the master unit via the transmission time slot after the predetermined time slot counted from the reception time slot that received the synchronization burst. At the same time, the identification code of the master unit included in the detected synchronization burst is stored in association with the reception time slot. As a result, the slave unit can easily establish synchronization with a plurality of master units, and by storing the result of the synchronization establishment, can perform outgoing and incoming calls via a plurality of master units of one slave unit. It can be done easily. In addition, each call charge corresponding to the unit talk time of each wire line accommodated in each master unit is registered in advance, and when a predetermined operation is performed, the master unit accommodating the wire line with the lowest call fee is accessed. A call is made via the wired line. As a result, it is possible to reduce the telephone charge of the slave unit.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. FIG. 5 is a system configuration diagram showing one embodiment of a digital wireless telephone device to which the present invention is applied. In the figure,
1 is a master unit, 2a to 2d are slave units, and the master unit 1 and each slave unit 2
Between a to 2d, digital wireless communication is performed by time division multiple access. FIG. 6 is an explanatory diagram showing an example of digital wireless communication by time-division multiple access performed between the master unit 1 and each slave unit. The transmission and reception time of one frame of communication data is 5 msec.
In this 5 msec, 1,920 bits of data are transmitted and received. Here, the time of 5 msec is
It is divided into eight time slots, so one time slot is 625 μsec, during which 240 bits of data are transmitted.

In FIG. 6, time slots SL1 to SL
L4 indicates the timing of the transmission burst transmitted from the base unit 1 to each of the slave units 2a to 2d, and the time slots SL5 to SL8 indicate the transmission burst of the transmission burst from each of the slave units 2a to 2d to the base unit 1. The timing is shown. The transmission burst transmitted in each time slot includes:
In addition to the control and communication purposes, a synchronization burst for synchronizing with the slave unit is also included. In this way, the base unit 1 and each slave unit perform communication through the determined time slot, so that when all eight slots of one frame are used by using one radio, It becomes possible for four slave units to perform mutual communication at the same time. The numbers in parentheses in the data format of the transmission burst in FIG. 6 indicate the required number of bits.

FIG. 2 is a block diagram showing the configuration of the master unit 1. As shown in FIG. In the figure, reference numeral 11 denotes a wireless transmitting / receiving unit for performing wireless communication with each slave unit via an antenna AT, 12 denotes a modem demodulator for demodulating a digital audio signal or the like from a wireless signal from the wireless transmitting / receiving unit 11, and 13 denotes a demodulated signal. , A channel codec for extracting a signal of a designated time slot from among them, a voice codec 14 for converting a digital signal extracted by the channel codec 13 into an analog signal,
Numeral 15 converts an analog signal from the voice codec 14 and outputs it to the wired line L1, and also converts a signal from the wired line L1 and outputs it to the voice codec 2.
A line code converter 16 for extracting a signal of a designated time slot from digital signals from the wired line L1 via the audio codec 14;
Reference numeral 17 denotes a modem modulator that modulates a digital signal from the channel codec 16 and outputs the modulated signal to the wireless transmission / reception unit 11.
Reference numeral 8 denotes a CPU that performs all control of the master unit 1. Reference numeral 19 denotes a line interface connected between the wired line L1 and the two-wire / four-wire conversion unit.

The radio transmission / reception unit 11 is configured as follows. That is, 112 is a receiving amplifier for amplifying a radio signal in the 1.9 GHz band transmitted from the slave unit via the antenna AT and the antenna switch 111;
Reference numeral 3 denotes a first which mixes an output signal of the receiving amplifier 112 with a signal of, for example, a frequency of 1.6 GHz from a PLL synthesizer described later and outputs a signal of a frequency of 240 MHz.
A mixer 114 is a second mixer that mixes the signal of the first mixer 113 and a signal of, for example, a 230 MHz frequency band from the PLL synthesizer and outputs a signal of a frequency of 10.8 MHz band, and 115A is an output signal of the second mixer 114. An intermediate frequency amplifying unit that inputs and outputs the signal to the modem demodulator 12 as a signal in the frequency band of 10.8 MHz, for example, and a carrier detection unit 115B that detects the presence or absence of radio waves on the handset 2 side.

Reference numeral 116 denotes a signal from the modem modulator 17 which is output from the PLL synthesizer, for example, at a frequency of 230 MHz.
A quadrature modulator 117 modulates based on a signal in the z band and outputs the signal as a signal in a 240 MHz band.
From the PLL synthesizer and, for example, a signal in a frequency band of 1.6 GHz, and a frequency of 1.9 GHz.
A third mixer 118 that outputs a band transmission signal is a transmission amplifier that amplifies a transmission signal of the 1.9 GHz band and outputs the amplified signal to each slave via the antenna switch 111 and the antenna AT.

That is, when a radio signal in the 1.9 GHz band from each slave unit is input to the radio transmitting / receiving unit 11 via the antenna AT, the radio transmitting / receiving unit 11
This signal is amplified by the first mixer 11.
Third, the second mixer 114 and the intermediate frequency amplifying unit 115A convert the modem demodulator 12 into a signal of, for example, a 10.8 MHz band.
Output to The received signal in the frequency band of 10.8 MHz is demodulated by the modem demodulator 12, and the demodulated signal of the designated slot is extracted by the channel codec 13. The control signal among the extracted signals is the CPU 1
In step 8, various processings are executed, and the processing results are output to the channel codec 16 and transmitted to the slave unit, or output to the line interface 19 side. The audio signal extracted by the channel codec 13 is converted into an analog audio signal or the like by the audio codec 14 and transmitted to the wired line L1.

On the other hand, of the signals from the wire line L1,
The audio signal is converted into a digital signal by the audio codec 14 via the two-wire / four-wire conversion unit 15, a signal of the designated slot is extracted by the channel codec 16, and then modulated by the modem modulator 17 to be transmitted to the wireless transmission / reception unit. It is sent to 11. In the wireless transmission / reception unit 11, the input signal is converted to a frequency of 1.9 GHz by the quadrature modulator 116 and the third mixer 117.
After being converted into a band signal, the signal is amplified by the transmission amplifier 118 and transmitted to the slave unit as a wireless signal. Further, a control signal such as an incoming signal from the wired line L1 is transmitted to the line interface unit 19.
Is transmitted to the CPU 18 via the. In this case, CPU1
Executes a predetermined process, and transmits incoming data and the like as a result of the process to the slave unit via the channel codec 16.

The above-mentioned PLL synthesizer 119 is provided in the radio transmission / reception section 11, and the PLL synthesizer 119 outputs a signal in the 1.6 GHz frequency band to the first mixer 113 and the third mixer 117. V
The phase of the output signal of the VCO 119B or VCO 119A that outputs a signal in the 230 MHz band to the CO (voltage controlled oscillator) 119A, the second mixer 113 and the quadrature demodulator 116 is compared with the phase of the reference signal, and the phase difference is determined. It comprises a PLL unit 119C that outputs a voltage to the VCO 119A, and a PLL unit 119D that compares the phase of the output signal of the VCO 119B with the phase of the reference signal and outputs a voltage corresponding to the phase difference to the VCO 119B. The frequency setting of the PLL synthesizer 119 is performed by the CPU.
18.

FIG. 3 is a block diagram showing another configuration of the base unit 1, showing an example in which the base unit 1 accommodates an ISDN line L2. In this case, the ISDN line L2 has D
An SU (line terminating device) 20 is connected. And DS
A first I-interface 21 and a second I-interface 22 are connected between the U20 and the voice codec 14. With this configuration, the base unit 1 can accommodate two analog wired lines L1 shown in FIG.

FIG. 1 shows a slave unit 2 wirelessly connected to the master unit.
FIG. 3 is a block diagram showing the configuration of FIG. The configuration of the slave unit 2 is the master unit 1
And the same parts as those of the master unit 1 in FIG. 2 are denoted by the same reference numerals. That is, the hardware of the wireless transmission / reception unit 11 and the like is the same as that of the main unit 1, but the CPU 31 of the sub unit 2 has a keyboard 32 such as a dial key.
Are connected, and a speaker 33 and a microphone 34 are connected to the audio codec 14. The audio signal from the base unit 1 is converted into an analog signal by the audio codec 14 via the channel codec 13 and output to the speaker 33, and the control signal from the base unit 1 is transmitted via the channel codec. Various processes are executed by the CPU 31.

On the other hand, the audio signal from the microphone 34 is converted into a digital signal by the audio codec 14, mixed with the output frequency of the PLL synthesizer 119 by the channel codec 16 as an audio signal of a time slot of the own station, and transmitted to the master unit 1. Is done. The operation information of the keyboard 32 is detected by the CPU 31 and provided to the channel codec 16, and is similarly transmitted to the base unit 1. Note that the CPU 31 of the slave unit 2 can set the frequency for the PLL synthesizer 119 in the same manner as the CPU 18 of the master unit 1 and determine the frequencies of the control channel and the communication channel.

Incidentally, the master unit 1 includes a self-management master unit for home use and business use, and a public master unit (public base station). Further, the public master unit corresponds to three businesses. There are three types of base stations. Conventionally, when the slave unit 2 is wirelessly connected to each of the master units, a switch provided in the slave unit is used by switching to either the private use or the public use. However, it is not possible to call a slave unit that has been switched to private use via the public base unit, and to call a slave unit that has been switched to public use the private base unit. There is a problem that it is impossible to make a call. Therefore, by establishing intermittent synchronization with a plurality of master units in the slave unit, it is possible to make a call from each master unit, thereby receiving and notifying an incoming call via each master unit.

Generally, the slave unit 2 is in a standby state (standby state) in order to prevent the consumption of a battery (not shown) which is a built-in power supply.
In this case, a timer (not shown) is started, and intermittent synchronization is established by transmitting and receiving a synchronization burst with the master unit at predetermined time intervals based on the time-out output of the timer to establish synchronization. Here, as shown in FIG. 4, it is assumed that one child device 2 is wirelessly connected to each of the parent device 1A for private use and the parent devices 1B and 1C for public use.

In such a case, the slave unit 2 establishes synchronization with the self-main unit 1A, for example, every 10 seconds. That is, when establishing synchronization with the parent device 1A, the CPU 31 of the child device 2 first controls the PLL synthesizer 119 to set its own control channel to the control channel frequency of the child device 1A. Then, the CPU 31 monitors the output of the carrier detection unit 115B provided in the wireless transmission / reception unit 11, and if it is determined that the radio wave (carrier) is being output from the base unit 1A, the CPU 31 then transmits this signal via the channel codec 13. It is determined whether the information based on the carrier output is information addressed to itself. Here, if the information is addressed to itself, a synchronization burst signal is output to the channel codec 16, and the channel codec 16 transmits a synchronization burst using the control channel to the side of the parent device 1A.

That is, if the identification code in the I information of the synchronous burst shown in FIG. 6 transmitted from the private base unit 1A is addressed to itself, the CPU 31 counts the fifth from the reception time slot. Through its own transmit timeslot,
A synchronization burst obtained by adding its own identification code to the I information in the synchronization burst shown in FIG. 6 is returned to the base unit 1A to establish synchronization with the base unit 1A. Then, the transmission / reception time slot at this time is stored in a built-in memory in association with the identification code of the master unit 1A included in the synchronization burst received from the private master unit 1A. After 10 seconds, the self-owned master unit 1
The same synchronization is established again as in A, and the slave unit 2 enters the standby state. As described above, in the slave unit 2, the self-main unit 1
A synchronization is established with A, and when the synchronization establishment is completed, a standby state is set.

In the child device 2, the public parent devices 1B, 1C
For example, the same synchronization is established at, for example, one minute intervals, and the transmission / reception time slot at this time and each public master unit 1
The identification codes B and 1C are stored in an internal memory (not shown) in association with each other. In the slave unit 2, each public master unit 1B, 1
The synchronization establishment timings of C are set to be different from each other. That is, the slave unit 2 establishes the above-described synchronization with the public master unit 1B every minute, and enters a standby state when the synchronization establishment is completed. Further, with respect to the public parent device 1C, synchronization is established every minute after, for example, 30 seconds have elapsed after the establishment of the synchronization with the public parent device 1B. In addition, the public parent device 1B,
When the control channels of 1C and the private parent device 1A are different, a frequency different from the control channel of the private parent device 1A is set in the PLL synthesizer 119.

When two PLL synthesizers 119 are provided, synchronization with four masters can be established at the same time. When one PLL synthesizer 119 is provided, synchronization with two masters can be performed simultaneously. Synchronization can be established. By the way, there may be a situation in which the synchronization establishment timing of any of the public master unit and the private master unit 1A matches, and the time slot at that time also matches, so that synchronization cannot be established. Since the time is 625 μsec (one time slot) in a minute, the probability of the synchronization establishment timing overlapping is extremely low and can be ignored. When the control channels of the private parent device and the public parent devices are different, the above-mentioned problem does not occur even if the synchronization establishment timings overlap.

As described above, the slave unit 2 intermittently synchronizes with each of the master units 1A to 1C during standby, and stores the time slots for reception and transmission at this time and the master units 1A to 1C in association with each other. . When incoming data or the like from each of the master units 1A to 1C arrives via each time slot of the control channel, the CPU 31 immediately receives the incoming data of these time slots based on the storage state of the internal memory,
It is possible to recognize from which master unit the incoming data has been transmitted. Then, upon receiving the incoming call, the speaker 33 is caused to ring, and at the same time, an incoming call is displayed on a display (not shown) to notify the incoming call.

That is, since synchronization can be established with a plurality of master units in one slave unit, each of the wired lines L
1 to L3, and can receive incoming calls via the master units 1A to 1C. In the child device 2, each parent device 1
It is possible to communicate with each other on each of the wired lines L1 to L3 via A to 1C. When an incoming call arrives at the same time from the private parent device and the public parent device, it is possible to preferentially receive the incoming call via the public parent device. Further, for example, during a call with the other party on the wired line L1 via the private base unit 1A, the public base unit 1B via the public line L2.
When the incoming call addressed to the user arrives via the control channel, the handset 2 can notify the incoming call by receiving and displaying the incoming call via the public base unit 1B. Therefore, in this case, the child device 2 uses the private parent device 1A.
Is held or the call is terminated, and an incoming call via the public parent device 1B is answered.

Also, by pre-registering each call charge corresponding to the unit talk time for each of the wired lines L1 to L3 in the memory 35 of the handset 2, and performing a predetermined operation on the handset 2,
It is possible to automatically select the line with the lowest call rate and make a call. That is, when a predetermined operation is performed by the keyboard 32 on the slave unit 2, the CPU 31 of the slave unit 2 refers to each call charge corresponding to the unit talk time of each of the wired lines L <b> 1 to L <b> 3 registered in the memory 35 in advance. , Select the wired line with the lowest call rates. Then, using the time slot of the master unit connected to the wired line, a call is made to the master unit via the control channel. In this case, when the master unit receives the dial data transmitted from the slave unit 2 by calling the slave unit 2, the CPU 18 of the master unit determines the dialing according to the dial data received on the wired line via the line interface 19 or the DSU 20. Send a signal. As a result, the call of the other party is performed, and the state is shifted to the call state by the response of the other party.

[0028]

According to the present invention as described in the foregoing, the slave unit, the presence or absence of a synchronization burst transmitted from a plurality of master unit detects via the reception time slot in different time periods, respectively, the detected synchronization If it is determined from the identification code included in the burst that the synchronization burst is addressed to the own station, the synchronization with the identification code of the own station added via the transmission time slot after the predetermined time slot counted from the reception time slot that received the synchronization burst The slave is returned to the master to establish synchronization, and the identification code of the master included in the detected synchronization burst is stored in association with the reception time slot. In addition to establishing synchronization with the handset, storing the result of the synchronization establishment makes it easy to send and receive calls via multiple master units of one slave unit. Can. In addition, each call charge corresponding to the unit talk time of each wire line accommodated in each master unit is registered in advance, and when a predetermined operation is performed, the master unit accommodating the wire line with the lowest call fee is accessed. Since the call is made via the wired line, the call charge of the slave unit can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a slave unit to which a synchronization establishment method of a digital wireless telephone device according to the present invention is applied.

FIG. 2 is a block diagram of a parent machine constituting the apparatus of the embodiment.

FIG. 3 is a block diagram showing a second embodiment of the master unit.

FIG. 4 is a diagram illustrating an example in which one child device is wirelessly connected to a plurality of parent devices.

FIG. 5 is a system configuration diagram illustrating a configuration of the apparatus according to the present embodiment.

FIG. 6 is an explanatory diagram showing the configuration of communication timing and communication data between a parent device and a child device.

[Description of Signs] 1... Master unit, 1A... Self-employed master unit, 1A, 1B... Public master unit, 2a to 2b.
6 ... channel codec, 14 ... voice codec,
15A, 15B ... 2-wire 4-wire converter, 18, 31 ... CP
U, 19 ... line interface, 20 ... DSU, 21 ...
1st I interface, 22... 2nd I interface, 35... Memory, 115A.
B: Carrier detector, 119: PLL synthesizer, L
1 to L3: Wired line.

Claims (2)

(57) [Claims] A base unit accommodating a wired telephone line and having a control channel and a communication channel for performing wireless communication by time division multiple access through a plurality of transmission and reception time slots for a control signal and a voice signal. If, in the digital wireless telephone system consisting of said base unit wirelessly connected thereto handset, the child machine, intermittently synchronization burst in a plurality of master unit and the different time periods respectively through each time slot of the control channel Rutotomo with intermittent synchronization establishing means for transmitting and receiving
In the intermittent synchronization establishing means is sent from said plurality of base unit
The presence or absence of a synchronization burst at different time periods.
Detecting means for detecting via a reception time slot;
Identification code included in the synchronization burst detected by the means
If it is determined that this synchronization burst is addressed to
Counting from the reception time slot where the synchronization burst was received
Own station via the transmission time slot after the predetermined time slot
Transmitting means for transmitting a synchronous burst to which an identification code is added
And the synchronization burst detected by the detection means
If the burst is addressed to it, it is included in this burst
Stores the identification code of the master unit in association with the reception time slot
And a storage means for performing synchronization. 2. The unit talk time of each of the wired telephone lines accommodated in each of the base units according to claim 1.
Register each call charge corresponding to
The machine is the wired line with the lowest call charge when the specified operation is performed
Select the master unit that accommodates the telephone line, and make a call via this master unit.
Communication establishment method for a digital wireless telephone device.