JP2001309437A - Portable wireless terminal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a portable wireless terminal that can conduct direct communication with an opposite party via a slave station slot provided in one communication wave not via a base station, when the portable wireless terminal is resident at the outside of a communication area of the base station. SOLUTION: A slot discrimination section 21 of a slot assignment section 20 discriminates, on which of a base station slot or a slave station slot the succeeding processing of a demodulated reception signal relies from a transmission slot instruction signal SS or the demodulated reception signal and outputs a reception slot instruction signal RS. A switch 22 gives the received signal to a base station slot section 23 or a slave station slot section 24, on the basis of the instruction signal RS to display it on a succeeding stage or to output a voice thereto. A slot in use depends on the discrimination of the slot discrimination section 21 or the decision of a slot decision section 26, depending on whether the terminal acts as a receiver or a transmitter at start of communication and a transmission signal is transmitted to the opposite party, depending on the slot via a base station slot section 28 or a slave station slot section 29.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable wireless terminal device, and more particularly to a portable wireless terminal device that performs TDMA wireless communication via a base station slot when in a communication area of a base station.

[0002]

FIG. 6 is a block diagram showing a conventional example of a portable radio telephone system using a portable radio terminal as a slave station.
FIG. 7 is a diagram showing a state of time slot allocation in FIG. This example is described in, for example, JP-A-8-33024. In the system shown in FIG. 6, the slave stations 51 and 52 communicate via the base station 53 controlled by the exchange 54. In this case, as shown in FIG.
There are four channels (time slots ~ and ~) for communication channels for transmission and reception, respectively.
In the slave stations 51 and 52, the time slots
One of the transmission periods is a time slot ~
Is the reception period. Further, in the base station 53, the reception period of the child stations 51 and 52 is the time slot of the transmission period, contrary to the child stations 51 and 52.

[0003]

In the above-mentioned conventional portable radio telephone system, a slave station must always communicate via a base station 53 controlled by an exchange 54. If it is outside the communication area 53, communication between slave stations cannot be performed. Further, even when communication can be performed within the communication area of the base station 53, the base station 53 and the slave station 5 can communicate with each other.
A communication channel of two channels for transmission and reception between the transmission channels 1 and 52 is required, and improvement is desired in terms of effective use of channels.

[0004] The present invention has been made to solve the above-described problem. When a slave station is in a communication area of a base station, conventional communication can be performed. When the mobile station is out of the communication area, the mobile stations can directly communicate with each other without passing through the base station.
It is an object of the present invention to provide a portable wireless terminal device that can be used as a slave station capable of performing execution using only waves.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to a portable radio terminal device that performs TDMA radio communication via a base station slot when in a communication area of a base station. In the case where the mobile station is out of the communication area of the base station, it is possible to directly transmit / receive to / from the other party's portable wireless terminal device through one predetermined wave in which a slave station slot different from the base station slot is set. And a slot switching unit for causing

According to such a configuration, the portable wireless terminal device can perform the conventional wireless communication via the base station slot when in the communication area of the base station,
If the mobile station is outside the communication area of the base station, the slot switching means sets a slave station slot different from the base station slot. Transmission and reception can be performed directly with the terminal device.

In the present invention, the slot switching means determines whether the subsequent processing of the demodulated received signal should be based on the base station slot or the slave station slot from the transmission slot instruction signal or the demodulated received signal. A slot determination unit for outputting a reception slot indication signal, a receiving base station slot unit for processing a given reception signal in accordance with a base station slot and displaying or outputting audio to a subsequent stage, and processing a given reception signal in accordance with a slave station slot A receiving side slave unit for displaying or outputting sound in a subsequent stage; and a receiving unit for providing a receiving signal to a receiving side base station slot unit or a receiving side slave station slot unit based on a receiving slot indication signal output by a slot determining unit. The side switch and subsequent processing of the transmitted transmission signal are performed in the base station slot or the slave station slot. A slot determining unit that determines whether the shift should be caused by the reception slot instruction signal or the transmission signal and outputs a transmission slot instruction signal, and a transmission base station slot that processes a given transmission signal according to the base station slot and transmits from a subsequent stage A transmitting-side slave station slot for processing a given transmission signal in accordance with a slave-station slot and transmitting the signal from a subsequent stage; and a transmitting-side base station slot or a transmitting-side base station based on a transmission slot indication signal output by the slot determining unit. A transmission-side switch for supplying a transmission signal to the slave station slot unit.

[0008]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a block diagram showing a configuration of an embodiment of a portable wireless terminal device of the present invention, FIG. 2 is a block diagram showing the portable wireless terminal device of FIG. 1 in detail, and FIG. FIG. 4 is a diagram showing an example of a signal format used for intercommunication by the portable wireless terminal device shown in FIGS. 2 and 3, and FIG. 5 is a diagram showing FIGS. 2 and 3. 6 is a time chart for explaining slot assignment operation when two portable wireless terminal devices are outside the communication area of the base station. The portable wireless terminal device 1 of FIG.
00 is a time-division multiplexing (TDMA) wireless communication function similar to the conventional one when in the communication area of the base station, and a predetermined wave (base station) when out of the communication area of the base station. A function of enabling direct wireless communication between portable wireless terminal devices using radio waves having different frequencies that do not affect radio waves in which slots are set.

In the portable wireless terminal device 100 shown in FIG.
The received signal includes an antenna 11, a common unit 12, a receiving unit 1
3 and is given to the demodulation unit 14 and demodulated.
The slot allocator 20 delivers an output according to the base station slot or the slave station slot to the controller 30 based on the demodulated signal. The control unit 30 performs control in accordance with an instruction from the key input unit 44 and a control program in the memory 45. For a given demodulated output, a necessary display is displayed on the display unit 41.
, And outputs the sound from the sound output unit 42, and transfers the input from the sound input unit 43 to the slot allocating unit 20. The slot allocator 20 delivers the input to the modulator so that the input is modulated according to the base station slot or the slave station slot previously determined based on the demodulated output. The signal modulated by the modulator 16 is transmitted to the transmitter 15
Is transmitted from the antenna 11 to the mobile wireless terminal device of the other party via the common unit 12.

The above-mentioned slot allocating section shown in FIG. 2 will be further described with reference to FIG. First, when portable radio terminal apparatus 100 receives a call from the other party, in slot allocating section 20 which has received the demodulated signal of the received signal from demodulating section 14, slot determining section 21 determines base station slot or base station slot to be determined from the demodulated signal. Based on the determination of the slave station slot or the determination of which of the transmission slot indication signals SS indicates the reception slot indication signal R
S, and drives the switch 22 to deliver the demodulated signal to the base station slot unit 23 or the slave station slot unit 24 and to use the reception slot indication signal RS based on the determination result as a transmission signal. Also communicate. In the case of the above-described determination based on the received signal, when the control data periodically (every several ms) transmitted from the base station does not arrive, that is, when the control data is out of the communication area, the slot determination unit 21 performs the predetermined determination. A slave station slot using one wave is selected, and a slave station slot is selected even when a signal is directly received from another portable wireless terminal device. The selection of the slave station slot is desirably displayed on the display unit 41. Needless to say, when the portable wireless terminal device 100 is within the communication area of the base station, the slot determination unit 2
1 selects a base station slot.

The base station slot unit 23 or the slave station slot unit 24, which has received an instruction based on the determination from the switch 22,
Using the timing signal from the timing generator 25,
The received demodulated signal is output in accordance with each format and delivered to the control unit 30. The transmission signal is transmitted to the control unit 3
0 to the slot determination unit 26. When the slot determination unit 26 has already received the reception slot instruction signal RS from the slot determination unit 21 as to whether to use the base station slot or the slave station slot, Drives the switch 27 on the basis of to transmit a transmission signal to the base station slot unit 28 or the slave station slot unit 29,
The signal is output to the modulation unit 16.

Conversely, when the portable radio terminal device 100 first calls the other party, the slot determination unit 26
The slot is determined by the reception slot instruction signal RS from the slot determination unit 21 or by a key input by the user, and the transmission slot instruction signal SS is given to the slot determination unit 21. In this case, when the slot determination unit 26 selects a slave station slot by key input in the communication area of the base station, the slot determination unit 26
Locks the slave station slot selection so as not to switch to the base station slot. This allows direct calls without going through the base station when the base station is congested. Therefore, if the user knows that the communication partner is nearby, the telephone charge can be saved by selecting the slave station slot by the key input method from the beginning. In this example, the status of selection and lock is displayed on the display unit 41 until released by key input.

Next, the operation when the portable radio terminal shown in FIGS. 2 and 3 is used outside the communication area of the base station will be described with reference to FIGS. Here, a call is made from the portable device 1 using one predetermined wave (for example, a radio wave of a frequency F1 that does not adversely affect the other in the area where the portable devices 1 and 2 are present), and the portable device 2 responds thereto. The case will be described. The format of the signal to be used is formed as shown in FIG. That is, with respect to the channel of the frequency F1, time division multiplexing is performed on four slots from slot 1 to slot 4. Each slot is represented by a symbol WS1, WS2, WS representing each slot.
3, WS4, and slot information following each of the symbols WS1, WS2, WS3, and WS4. The portable device 1 is assigned slot 1 for transmission and the slot 2 for reception, and the portable device 2 is assigned slot 1 for reception.
Assign slot 2 for transmission.

With the above-described configuration, the portable device 1 makes a call using the slot 1 of the channel of the frequency F1, and the portable device 2 transmits the call through the same slot 1 of the channel of the same frequency F1. Make a call. The portable device 2 responds to the incoming call using the slot 2 of the channel of the frequency F1.
Receive through. Subsequent communication between the mobile devices 1 and 2 is similarly repeated using the subsequent slot 1 and slot 2, and all communication is performed directly using the same frequency F1 without passing through the base station. . In the above-described example, it is possible to eliminate the designation of the receiving slot by notifying the receiving party of the own receiving slot number at the time of calling. The slots 3 and 4 can be used by a group of users of other portable devices. In addition, by allocating slots, it is possible to perform group direct communication among three or more wireless devices. Further, if the simplex press talk method is used together, it is also possible to realize direct communication (simplex) using a plurality of transceivers as transceivers.

[0015]

Since the portable radio terminal of the present invention is configured as described above in detail, when the portable radio terminal is within the communication area of the base station, the conventional portable radio terminal is connected via the base station. Although communication can be performed, when the portable wireless terminal device is outside the communication area of the base station, the portable wireless terminal devices can directly communicate with each other without passing through the base station, and the communication is also performed in one wave. Since it can be executed using only one channel, and a plurality of communication paths can be set thereby, the effectiveness can be improved also in terms of channel utilization.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an embodiment of a portable wireless terminal device of the present invention.

FIG. 2 is a block diagram showing the portable wireless terminal device of FIG. 1 in detail.

FIG. 3 is a block diagram showing a slot allocator of FIG. 2 in detail.

FIG. 4 is a diagram showing an example of a signal format used for intercommunication by the portable wireless terminal device shown in FIGS. 2 and 3;

FIG. 5 is a time chart for explaining a slot assignment operation when two portable wireless terminal devices in FIG. 2 are outside a communication area of a base station.

FIG. 6 is a configuration diagram showing a conventional example of a portable wireless telephone system using a portable wireless terminal device as a slave station.

FIG. 7 is a diagram showing a state of time slot allocation in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Antenna 12 Common part 13 Receiving part 14 Demodulation part 15 Transmission part 16 Modulation part 20 Slot allocation part 21 Slot judgment part 22, 27 Switch 23, 28 Base station slot part 24, 29 Child station slot part 25 Timing generation part 26 Slot determination Unit 30 control unit 41 display unit 42 audio output unit 43 audio input unit 44 key input unit 45 memory 100 portable wireless terminal device

Claims (2)

[Claims] 1. When in a communication area of a base station,
In a portable wireless terminal device that performs TDMA wireless communication via a base station slot, when the mobile station is out of the communication area of the base station, a predetermined wave in which a slave station slot different from the base station slot is set A portable wireless terminal device having slot switching means for enabling direct transmission / reception with a partner portable wireless terminal device. 2. The slot switching means according to claim 2, wherein said slot switching means determines from a transmission slot instruction signal or a demodulated reception signal whether the subsequent processing of the demodulated reception signal should be performed by a base station slot or a slave station slot. , A receiving base station slot unit for processing a given received signal in accordance with a base station slot and displaying or outputting sound to a subsequent stage, and a given received signal for processing in accordance with a slave station slot. A receiving-side slave station slot unit for displaying or outputting sound, a receiving-side switch for providing a receiving signal to the receiving-side base station slot unit or the receiving-side slave station slot unit based on the receiving slot instruction signal output by the slot determining unit, Receives whether subsequent processing of the transmitted signal should be based on the base station slot or slave station slot A slot determination unit that determines a slot indication signal or a transmission signal and outputs a transmission slot indication signal, a transmission base station slot unit that processes a given transmission signal in accordance with a base station slot and transmits from a subsequent stage, and a given transmission The signal is processed in accordance with the slave station slot and transmitted to the transmitting slave station slot part or the transmitting slave station slot part based on the transmission slot indication signal output from the slot determining part, which is transmitted from the subsequent stage. 2. A transmission switch for providing a signal.
The portable wireless terminal device according to claim 1.