JP3033407B2 - Communication system between moving objects - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system, for example, a PHP (Personal Handy Phone) known as a second generation cordless telephone system.
e) is used.

[0002]

2. Description of the Related Art In recent years, mobile communication systems such as a mobile phone and a mobile phone have been put into practical use due to a rapid demand for information and an increase in demand for a communication tool corresponding to spatial movement. A second generation digital cordless telephone (PHP) is now under development in which analog cordless telephones for homes and offices, which are now widely used, are digitized and their functions are extended so that they can be used outdoors.

[0003] Further, in a conventional analog cordless telephone, communication between mobile stations via a base station is supported, but in the above-mentioned mobile communication system (PHP), the transmission system is a TDD system (base station-mobile station). Since the same frequency is used for time division processing between uplink and downlink, direct communication between mobile stations (without passing through a base station) can be easily realized.

[0004]

However, in the above-mentioned mobile communication system, it is necessary to prevent the communication state from deteriorating due to the movement of the mobile station, to avoid interference for preventing radio wave interference caused by obstacles, etc. In order to prevent monopolization regarding the assignment of wireless channels, the wireless line must be disconnected once within three minutes from the calling transmission of the call between the slave units, and a pause of two seconds or more must be taken.

Accordingly, the present invention has been made in view of the above problems, and when a voice call is made without passing through a base station,
When there is no disconnection request from the user, the mobile station automatically stops the voice call and automatically performs the calling operation again to provide a communication system between mobiles that enables continuous voice call. It is the purpose.

[0006]

For Means for Solving the Problems] As the present invention, Ma
Microphones, speakers, audio processing units,
By receiving a communication radio channel from a base station having a predetermined communication area between mobile stations , voice communication can be performed.
In a communication system between mobiles that enables talking, an auxiliary system for performing voice communication between mobile stations without passing through the base station is provided in each of the plurality of mobile stations , and the auxiliary system includes an uplink system. Time-division use for the same frequency with downlink
And the auxiliary system includes the plurality of TDD systems.
Counts the voice call time between mobile stations and counts
When a predetermined time has elapsed, the voice between the plurality of mobile stations is
Cutting means for cutting the connection of the call, due to the cutting means
When a predetermined pause time elapses after disconnection, the plurality of
Call one of the mobile stations and wait for a message.
And standby control means to keep the idle scan status, the
After a predetermined pause time, the other mobile station of the plurality of mobile stations
When a station calls the one mobile station, the plurality of mobile stations are transmitted.
Automatically reconnect voice calls between mobile stations to make continuous calls
Reconnecting means for moving
It is characterized by a configuration called a call system.

[0007]

With the above arrangement, the auxiliary system counts the voice communication time between the mobile stations by the disconnecting means, and automatically disconnects the voice communication between the mobile stations when the count has elapsed for a predetermined time. I do. Standby control means, switching
When a predetermined pause time elapses after cutting by the cutting means
Calls a mobile station out of a plurality of mobile stations.
In an idle scan state to wait for a page. Reconnection means
Means that after a predetermined pause, the other mobile station
Calling the office automatically reconnects the voice call
To make a continuous call.

[0008]

As described above, in the present invention,
When a voice call is made without passing through a base station, disconnection and connection between mobile stations are automatically performed unless disconnection request is received from an operator. Even if the operator does not perform the call operation again,
There is an excellent effect of providing a mobile communication system that enables voice communication.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings. In this embodiment, a case where the present invention is applied to a PHP system known as a second generation cordless telephone will be described. The block diagram shown in FIG. 1 includes a TDMA system in which one frequency is time-division multiplexed and a time slot is assigned to each telephone, and a TDD system in which the same frequency is time-divisionally used for uplink and downlink between a base station and a mobile station. Is a mobile communication system that employs a multi-carrier TDMA / TDD scheme of four-channel multiplexing that can multiplex and use up to four lines at one frequency.

In FIG. 1, a mobile station PS1 has a CPU
2. ROM 4, RAM 6, operation keys 8 for inputting telephone numbers and various commands, gate array unit 10 comprising a group of communication logic circuits for processing communication data, and converting analog signals from microphone 12 to digital signals. Gate array unit 1
0, and converts the digital audio signal from the gate array unit 10 into an analog signal and outputs it to the speaker 14. The audio processing unit 16 transmits communication data from the gate array unit 10 to the π at a radio frequency of 1.9 GHz band. / 4 shift QPSK (Quadrature Phase Shift Keying) modulation and transmission from the antenna 18, as well as demodulation of the received signal from the antenna 18 and output to the gate array unit 10.
A radio unit 20 including a demodulation circuit; a reception level detection unit 22 for detecting a reception level of a signal received from the antenna 18;
It is configured as a cordless telephone provided with.

The gate array section 10 includes a CPU
The control unit 2 converts the control data generated by the CPU 2 and the communication voice data converted into digital signals by the microphone 12 and the voice processing circuit 16 into communication data for TDMA transmission based on the communication timing commanded by 20
Output to In addition, it takes in the received signal demodulated by the radio unit 20, extracts call voice data from the received signal and outputs it to the voice processing unit 16, and also extracts various control signals and outputs them to the CPU 2.
The CPU 2 controls the gate array unit 10 according to a predetermined process based on a command input from the operation keys 8 and control data for controlling incoming and outgoing calls from the mobile station PS2. The mobile station 1 and the mobile station 2 shown in FIG. 1 have the same configuration.

Next, the operation of the direct call between the mobile station PS1 and the mobile station PS2 will be described with reference to the flowchart shown in FIG. First, when the power switch is turned on, the mobile station PS1 and the mobile station PS2 of the present embodiment enter an idle scan state, detect information on all wireless channels, and detect all of the frequencies assigned to the handset-to-slave communication. By receiving the area, it is detected whether there is a request message from another child device. Then, when the user operates the operation key 8 and a call request is issued to the mobile station PS2, the processing operation of the flowchart shown in FIG. 2 is started.

In step 100, the mobile station PS1
Starts a connection sequence in the radio section as shown below in order to obtain an assignment of a voice communication channel (transmission of voice data and transmission of information necessary for communication) to the mobile station PS2. First, as shown in FIG. 3, the mobile station PS1 transmits an SCCH (a point-to-point bidirectional channel for transferring information necessary for call connection between the mobile stations) to the mobile station PS2. Request a connection using the mobile station PS
2 transmits a call message M1. When the call message M1 is transmitted, the start of the warning notification timer in step 110 is set. Note that the warning notification timer is a timer for notifying that the connection is temporarily stopped after a predetermined time from the start of the connection sequence with the partner mobile station. The warning notification timer is omitted in the block diagram shown in FIG.

Next, the mobile station PS2 is connected to the mobile station PS1.
Receiving the call message M1 from the mobile station PS1
To notify the mobile station P that the paging message M1 has been received, using the SCCH.
Send to S1. When receiving the synchronization message M2, the mobile station PS1 transmits a synchronization message M3 using the SCCH to notify the mobile station PS2 that the synchronization message M2 has been received. When the mobile station PS2 receives the synchronization message M3, it recognizes that the mobile station PS1 has received the synchronization message M2, and transmits a response message M4 to the mobile station PS1 using the SCCH. Further, the response message M
4 using the TCH (both point-to-point channels for transferring user information)
An idle burst for frequency and time synchronization is performed. Note that the maximum transmission time of the call message M1 is set to 10 in consideration of battery saving.
The transmission ends when a synchronization message is received from the other party.

In step 120, if the connection is successful based on the state of the connection sequence between mobile station PS1 and mobile station PS2, communication between the mobile stations becomes possible, and the process proceeds to step 130. If the connection has failed, the process proceeds to step 135, where the timer of the warning notification timer is stopped, and then the apparatus enters an idle scan state, and detects information on all wireless channels.

Then, in step 130, it is determined whether or not a preset time of 2 minutes and 50 seconds has been reached since the operation of the warning notification timer was started. Here, when it is determined that the time from the start of the operation of the warning notification timer has reached 2 minutes and 50 seconds, the process proceeds to step 140. When a disconnection request is issued via the operation key 8 between steps 100 and 130, transmission is stopped as interrupt processing, and the apparatus shifts to an idle scan state.

In step 140, the user is notified by a not-shown display or a voice or the like that it is almost three minutes since the connection between the slave units has started (2 minutes and 50 seconds). For this reason, the user must start 3
It is possible to recognize that the time is close to the lapse of minutes, and it is possible to know in advance the stop that will occur for 2 seconds after that, and it is possible to prevent problems due to the stop for 2 seconds.

In step 150, the start of a 10-second timer is set. Then, in step 160, it is determined whether or not 10 seconds have elapsed. When it is determined that 10 seconds have elapsed, the process proceeds to the next step 170. In step 170, it is determined whether or not a call disconnection request has been generated by a user's operation of the operation key 8 or the like during 10 seconds from the start to the end of the 10-second timer. Here, if it is determined that the disconnection request has not been generated, the process proceeds to step 180, and if it is determined that the disconnection request has been generated, the process proceeds to step 1
The flow shifts to 85, where transmission is stopped, and the flow shifts to the idle scan state.

In step 180, the transmission to the mobile station PS2 is stopped once, and the process proceeds to step 190.
Then, in step 190, the start of a two-second timer is set, and in step 200, it is determined whether or not two seconds have elapsed. Here, when it is determined that two seconds have elapsed, the process proceeds to step 210 and the mobile station P
It is determined whether or not S1 is the calling side. If the mobile station PS1 is the transmitting side, the process proceeds to step 220, and when returning to step 100, the other party to automatically transmit is set as only the mobile station PS2.
Return to 0. (On the other hand, if the mobile station PS1 is the called side, the process proceeds to step 225, where the receivable partner is set as only the mobile station PS2, the idle scan state is established, and a call message from the mobile station PS2 is waited for. Note that while the call is continued, step 10 is executed.
The processing operation from 0 to step 220 is repeated, and the processing operation according to the flowchart is repeated until a disconnection request is issued by the user. Then, the transmission is stopped when the disconnection request is generated by the user, and the state shifts to the idle scan state.

Therefore, in this embodiment, the base station
If a voice call is made without using a telephone, the user is informed that the call time will be limited, and if there is no disconnection request from the user, the mobile station automatically stops the voice call and performs a calling operation again. Therefore, unless there is a disconnection request from the operator, disconnection and connection between the mobile stations are automatically performed, and even if the disconnection between the mobile stations is performed once, the operator performs the calling operation again. And a continuous voice call is possible.

In the present embodiment, if a disconnection request cannot be detected three minutes after the start of the connection, the mobile station PS1 on the transmitting side must provide The station number of the mobile station PS2 is maintained, and the mobile station PS2 on the receiving side accepts only a call request from the mobile station PS1 that has been talking.

In this embodiment, the CPU 2 controls
Means, a communication connection state detecting means.
Corresponds to the connection means, and step 180 corresponds to the disconnection means.

[Brief description of the drawings]

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

FIG. 2 is a flowchart illustrating an operation between mobile stations according to the present embodiment.

FIG. 3 is a diagram illustrating a signal flow between mobile stations according to the present embodiment.

[Explanation of symbols]

 2 CPU

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) H04B 7/26 H04M 1/00 H04Q ⁷ /00-7/38

Claims (3)

(57) [Claims] 1. A microphone, a speaker, an audio processing unit, and a radio
A communication system between mobile units which enables voice communication by receiving a communication radio channel from a base station having a predetermined communication area among a plurality of mobile stations having a communication unit. Between mobile stations without going through the base station
An auxiliary system for voice communication is provided for each of the plurality of mobile stations;
Station, and this auxiliary system performs the same
The auxiliary system counts the voice call time between the plurality of mobile stations , and uses a TDD system that uses time division based on wave numbers.
When a predetermined time has elapsed, the plurality of movements
Disconnecting means for disconnecting the voice call connection between the stations, and when a predetermined pause time has elapsed after disconnection by the disconnecting means;
Call one of the plurality of mobile stations.
Standby in idle scan state waiting for messages
Control means, and after the predetermined pause time, the other of the plurality of mobile stations.
When the mobile station calls the one mobile station,
Automatically reconnects voice calls between mobile stations for continuous calls
Moving body characterized by comprising reconnection means for performing the connection
Inter-call system. 2. The method according to claim 1, wherein the predetermined time is three minutes.
2. The method according to claim 1, wherein the pause time is 2 seconds.
Communication system between moving objects. 3. Notifying in advance of disconnection by said disconnecting means.
3. A notifying means comprising:
A communication system between mobiles according to the above.