JP3228615B2 - Digital cordless 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 digital cordless telephone device using a TDMA / TDD system.

[0002]

2. Description of the Related Art FIG. 10 shows the configuration of a conventional digital cordless telephone device. In FIG. 10, A is a schematic block diagram of a base station, and B is a schematic block diagram of a mobile station. In the base station A, reference numeral 101 denotes an antenna, which is connected to the radio circuit 102. The wireless circuit 102 transmits and receives wireless data while being instructed by the wireless control unit 103 about the frequency and the transmission and reception timing. Reference numeral 102a denotes a synthesizer built in the wireless circuit 102, which generates a frequency designated by the wireless control unit 103. The wireless control unit 103 measures the reception level from the received wireless data to determine the position of the mobile station, and performs a process of writing to the temporary storage memory 104. Reference numeral 105 denotes a call / line control unit, which is connected to the line 106 and the channel codec unit 107. 1
A control unit 08 includes a microcomputer or the like, and issues a line control instruction to the call / line control unit 105. The speech / line control unit 105 converts the signal received from the line 106 into digital data and transfers it to the channel codec unit 107, and converts the digital voice data received from the channel codec unit 107 into analog data. Send to Channel codec section 107 assembles and disassembles data transmitted and received on a wireless communication channel and a control channel. The communication channel data includes information such as voice and control information processed by the control unit 108, and user data such as voice is processed without passing through the control unit 108.

The control channel data and the communication channel control data are transmitted from an antenna 101 to a radio circuit 102.
When the data is received via the control unit 10, the channel codec 107 transfers only the data to the temporary storage
8 is notified of reception. The reception timing is instructed from the channel codec unit 107 to the radio control unit 103 and the radio circuit 102 each time. The control unit 108 sets the reception frequency in the wireless control unit 103 in advance for each reception timing. When transmitting control data, the control unit 108 includes the wireless control unit 103 and the wireless circuit 102.
, And instruct the transmission timing in advance to transmit data to the wireless circuit 102. Further, the channel codec unit 107 has a function of generating a transmission timing of control data that is intermittently transmitted at regular intervals in the control channel, a function of detecting the presence / absence of an error at the time of data reception, And the like.

In mobile station B, reference numeral 110 denotes an antenna, which is connected to radio circuit 111. Wireless circuit 111
Has a built-in synthesizer 111a. Reference numeral 112 denotes a wireless control unit, 113 denotes a channel codec unit, and 114 denotes a control unit composed of a microcomputer or the like, and includes a base station communication control unit 114a and a mobile station communication control unit 114b. 115 is a temporary storage memory. Each of the above units basically has the same function as that of the base station A, but the mobile station B does not perform the intermittent transmission function, so that the channel codec unit 113 does not have the function of generating the timing of the intermittent transmission. Instead, the base station has an intermittent reception timing generation function for intermittently receiving a signal on the control channel that is intermittently transmitted by the base station during standby to suppress the average current consumption of the internal battery of the mobile station. . 116 is a call control unit, 117 is a receiver, and 118 is a microphone.
The call control unit 116 performs analog / digital conversion of voice between the channel codec unit 113, the receiver 117, and the microphone 118. The operation unit 119 and the display unit 120 are connected to the control unit 114, and the control unit 114
It detects an input such as the start of communication from the operation unit 119 and outputs information for display to the display unit 120.

Next, the TDMA / TDD system (a bidirectional transmission system in which a plurality of uplink / downlink transmission paths are secured by using a frequency carrier in a time-divided manner) will be briefly described. FIG. 11 shows a certain frequency carrier going up (in the direction from the mobile station to the base station or from the called mobile station to the calling mobile station) and going down (from the base station to the mobile station or the calling mobile station to the called mobile station). ) And the concept of a method of transmitting the information in the direction of time by dividing the time into four. Usually, one time section obtained by time division is called a time slot or a slot, and radio data transmitted in the slot is called a burst. One frequency carrier is temporally divided into four time slots, and one uplink and downlink pair of each time slot is assigned one bidirectional channel for communication.

In the case of communication between base stations and mobile stations, frequency carriers are used independently by different frequencies for a control carrier for transmitting control data for connection control and a communication carrier for transmitting voice, user data, and the like. Is done. In the case of communication between two mobile stations (direct communication between mobile stations), the control carrier and the communication carrier are shared, and the carrier for direct communication between mobile stations is the same as the carrier for control between base stations and mobile stations. Has a different frequency. Usually, a channel on a communication frequency carrier is called a communication channel, and a channel on a control frequency carrier is called a control channel.

FIG. 12 shows a burst configuration of a control channel.
2 shows a burst configuration of a communication channel and a burst configuration of a synchronous burst signal. In the case of communication between base stations and mobile stations,
In the downlink control channel, after transmitting control data in a single shot, a non-transmission period of a fixed period is repeated, and the downlink signal is transmitted intermittently. This is called intermittent transmission, and the base station constantly transmits data necessary for the mobile station that has entered the service area to immediately access the base station. Also, when notifying the mobile station of an incoming call, the mobile station is notified by this intermittent transmission. The uplink signal of the control channel is a random access because it is used when the mobile station requests to allocate a communication channel to the base station for transmission or the like. Even when the base station allocates a communication channel to the mobile station, the downlink control signal is transmitted by intermittent transmission. Once a communication channel is allocated, the mobile station continuously transmits a synchronization burst signal to the base station. As a result, the mobile station and the base station recognize that each other has secured a one-to-one bidirectional communication channel, and can continuously transmit burst signals for communication with each other. The synchronization burst signal is a long preamble or a unique word like the control burst in order to ensure the synchronization by continuously transmitting first after shifting to the communication channel. Since the communication burst is always transmitted continuously, the preamble and the unique word are short. Instead, it has enough user information fields to store voice and user data.

In the direct communication between mobile stations, as opposed to the communication between base stations and mobile stations, both mobile stations do not constantly transmit control data on the control channel during standby. To perform random access. At this time, the mobile station that has transmitted first plays the role of the base station in the communication between the mobile station and the base station, that is, the role of the synchronization source during communication. However, as described above, since the carrier itself is shared between the control channel and the communication channel, after transmitting the transmission signal from the transmitting mobile station, the receiving mobile station performs communication between the mobile station and the base station. A synchronous signal instead of the synchronous burst signal in the above is transmitted as a burst signal on the control channel, and the originating mobile station returns a synchronous signal and continuously transmits the synchronous signals to each other, so that transmission and reception are established. . Then, when the receiving mobile station performs a response operation, a response signal on the control channel is transmitted from the receiving mobile station to the calling mobile station, and then the communication channel is transmitted on the same carrier and the same slot. And the communication is established.

Next, the standby operation of the mobile station in the conventional example shown in FIG. 1 will be described. The operation of the mobile station during standby differs depending on whether the mobile station is in a standby state for communication between base stations and mobile stations or in a standby state for direct communication between mobile stations.
Therefore, whether to use the communication between the base station and the mobile station or the direct communication between the mobile stations is set using the operation button of the operation unit 119, and the control unit 114 controls the communication between the base station and the base station according to the setting contents. Unit 114a or mobile station communication control unit 114b instructs channel codec unit 113.

First, the standby operation of communication between a base station and a mobile station will be described with reference to the flowchart of FIG. At the time of waiting for communication between the base station and the mobile station, the base station communication control unit 114a of the control unit 114 in the mobile station B instructs the channel codec unit 113 to perform a continuous reception state by power-up or the like. It waits for reception of a control downlink signal intermittently transmitted from the station A in the control channel (steps 131 and 139). Next, upon receiving a control downlink signal from the base station A, the control unit decodes whether the received signal is a signal from a base station that can be paired with the mobile station, and if the signal is from a base station that can be paired, If necessary, after communicating with the base station for location registration of the mobile station, the base station communication control is performed so that an incoming signal from the base station is intermittently received in synchronization with the intermittent transmission timing. The unit 114a instructs the channel codec unit 113 (steps 132, 133, 134, 140, and 14).
1, 142, 143). When you receive incoming data,
An instruction to transmit control data is transmitted to base station communication control section 114.
a instructs the channel codec unit 113 to shift to the operation during communication connection (steps 135, 136, 137,
138, 144, 145, 146, 147).

FIG. 14 is a timing chart showing the operation of the mobile station during intermittent reception. In FIG. 14, Ta is a carrier reception cycle that matches the timing of intermittent transmission from the base station, and performs intermittent reception at this timing. In this intermittent reception, it is desirable that the time during which the reception is turned on is as close as possible to the actual data reception time, but taking into account the rise time of the wireless circuit, etc., the reception is turned on earlier than the actual data reception time. It is common to do.

Next, the standby operation of the direct communication between mobile stations will be described with reference to the flowchart of FIG. In the case of waiting for direct communication between mobile stations, the transmitting side randomly transmits outgoing data at the time of outgoing transmission, and thus does not periodically receive control data from the partner mobile station during standby. Therefore, intermittent reception cannot be performed according to intermittent transmission of the other party. Instead, the inter-mobile-station communication control unit 114b instructs the channel codec unit 113 to alternately and continuously receive a plurality of carriers allocated for direct communication between mobile stations. That is, a plurality of, for example, three carriers for direct communication between mobile stations are continuously received at regular time intervals (steps 151, 152, 153, and 15).
6). In that case, the mobile station may perform intermittent reception with a certain period of non-reception period to reduce the average current consumption of the battery. When the transmission data from the partner mobile station is received during continuous reception of a certain carrier for direct communication between mobile stations, the mobile station communication control unit 114b issues an instruction to determine the slot timing to the channel codec unit 11b.
3 and the mobile station communication control unit 114b instructs the channel codec unit 113 to transmit the synchronization burst signal from the antenna 110 through the radio circuit 111 at the timing of the downlink slot (step 1).
52, 154, 157, 159). Thereafter, communication with the other mobile station is established by the above-described procedure (step 15).
5, 160, 161).

FIG. 16 is a timing chart of the standby operation of the direct communication between mobile stations, and shows a state in which reception of three carriers for mobile stations is repeated in order and intermittent reception is performed. Note that the carrier reception cycle Tb is different from the carrier reception cycle Ta at the time of standby during communication between base stations, and is an intermittent reception cycle that is uniquely set by the mobile station.

[0014]

However, in the above-mentioned conventional digital cordless telephone apparatus, a standby state for performing communication between a base station and a mobile station and a standby state for performing direct communication between mobile stations are separately controlled. Therefore, when waiting for direct communication between mobile stations, there is a problem that an incoming call from a base station that can be connected to the mobile station cannot be received.

The present invention has been made to solve the above-mentioned conventional problems, and has an excellent capability of receiving an incoming call from a base station which can be connected to the mobile station during standby for performing direct communication between mobile stations. It is a first object to provide a digital cordless telephone device.

A second object of the present invention is to provide a digital cordless telephone device that can extend the usable time of a mobile station.

[0017] A third object of the present invention is to provide a method for receiving a call from a base station and a call from another mobile station when the mobile station moves from outside the base station to the service area when waiting for direct communication between mobile stations. Is to provide a digital cordless telephone device that can immediately receive a telephone.

[0018]

SUMMARY OF THE INVENTION In order to achieve the first object, the present invention relates to a mobile station of a digital cordless telephone capable of performing communication between base stations and mobile stations and direct communication between mobile stations. Control means for alternately monitoring an incoming notification signal from the base station and an incoming notification signal from another mobile station when waiting for direct communication, a channel codec section and a memory for temporarily storing received data received by the channel codec section It is provided with.

Further, according to the present invention, in order to achieve the above-mentioned object, a mobile station is provided with a fixed communication mode when waiting for direct communication between mobile stations.
Notification signal from the base station and other
Control means for alternately monitoring the notification signal from the station,
In addition, the mobile station determines that
During standby operation in direct communication between mobile stations,
Carrier reception is performed multiple times, and then the base station is controlled.
The operation to execute the carrier reception for
It is a sign .

Further, according to the present invention, in order to achieve the above object, a mobile station is provided with a fixed communication mode when waiting for direct communication between mobile stations.
From the base station within the carrier reception cycle Ta
Operation to alternately monitor signals and notification signals from other mobile stations.
Control means for controlling the operation of the mobile station,
The mobile station performs intermittent reception in synchronization with the notification signal from the mobile station.
Monitors the notification signal from the base station when waiting for direct communication between
Monitoring period and monitoring period of notification signals from other mobile stations.
Between the fixed carrier reception and the period during which the monitoring is stopped.
A control carrier for base station communication,
Is performed every time the fixed carrier reception cycle Ta is reached.
Rather than base, once per several cycles, that is, several times Ta
The fact that control carrier reception for local station communication is performed
It is a feature .

[0021]

Therefore, according to the present invention, when waiting for direct communication between mobile stations, an incoming call from a base station which can be connected to the mobile station can be received, so that the function as communication means can be improved.

Further, according to the present invention, intermittent reception is performed, and a period in which monitoring is stopped during a carrier reception period during standby is provided, so that the current consumption of the internal battery of the mobile station can be reduced.

Furthermore, according to the present invention, the notification signal from the base station is monitored outside the base station in the same manner as in the service area. Can be received.

[0024]

(Embodiment 1) FIG. 1 shows the structure of a first embodiment of the present invention. In FIG. 1, A is a base station, B
Is a mobile station. In the base station A, 1 is an antenna, and 2 is a radio circuit. The wireless circuit 2 includes a wireless control unit 3
While instructing the frequency and transmission / reception timing from
Transmits and receives wireless data. Reference numeral 2a denotes a synthesizer built in the wireless circuit 2, which generates a frequency specified by the wireless control unit 3. The wireless control unit 3 measures the reception level from the received wireless data to determine the position of the mobile station,
A process for writing to the temporary storage memory 4 is performed. 5 is call /
The line control unit is connected to the line 6 and the channel codec unit 7. Reference numeral 8 denotes a control unit constituted by a microcomputer or the like, which issues a line control instruction to the call / line control unit 5. The call / line control unit 5 converts the signal received from the line 6 into digital data and transfers it to the channel codec unit 7, and converts the digital voice data received from the channel codec unit 7 into analog data. Send. The channel codec unit 7 assembles and disassembles data transmitted and received on a wireless communication channel and a control channel. The data of the communication channel is composed of information such as voice and control information processed by the control unit 8, and user data such as voice is processed without passing through the control unit 8.

In the mobile station B, reference numeral 10 denotes an antenna, which is connected to the radio circuit 11. The wireless circuit 11 includes a synthesizer 11a. 12 is a wireless control unit,
Reference numeral 13 denotes a channel codec unit, and reference numeral 14 denotes a control unit including a microcomputer or the like, which includes a base station communication control unit 14a and a mobile station / base station communication control unit 14b. Reference numeral 15 denotes a temporary storage memory. Each of the above units has basically the same function as the base station A, but the mobile station B does not perform the intermittent transmission function.
Has no intermittent transmission timing generation function. Instead, the base station has an intermittent reception timing generation function for intermittently receiving a signal on a control channel that is intermittently transmitted by the base station during standby in order to suppress the average current consumption of the internal battery of the mobile station B. . 16 is a call control unit, and 1
7 is a receiver and 18 is a microphone. Call control unit 16
Performs analog-to-digital conversion of audio between the channel codec unit 13 and the receiver 17 and the microphone 18. The operation unit 19 and the display unit 20 are connected to the control unit 14. The control unit 14 detects an input such as a start of communication from the operation unit 19, and outputs information for display to the display unit 20.

Next, the standby operation of the mobile station in the first embodiment will be described. The standby operation in the communication between the base station and the mobile station is the same operation as the conventional example by the base station communication control unit 14a of the control unit 14. Therefore, here, the standby operation in the direct communication between the mobile stations is described.
The control unit 14 and the channel codec unit 13 will be described separately. First, the operation of the control unit 14 will be described with reference to FIG. When the mobile station B waits for direct communication between mobile stations capable of communicating with another mobile station, the mobile station / base station communication control unit 14 b sets the frequency of the control carrier for base station communication to the radio control unit 12. (Step 21), and the wireless circuit 11 is set to the continuous reception state. When the radio circuit 11 receives the control downlink signal from the base station A, it determines whether the received signal is a signal from a base station that can be paired with a mobile station and determines whether the received signal is a signal from the base station to be paired. If so, control of communication with the base station after the exchange of communication with the base station for location registration of the mobile station, etc., is performed according to the timing of intermittent transmission from the base station. The unit 14b instructs the channel codec unit 13 to wait for an incoming notification signal from the base station (step 22). When receiving an incoming notification signal from the base station through the channel codec unit 13 (step 23), the control unit 14 decodes the data, and the mobile station / base station communication control unit 14b transmits control data to the channel codec unit 13. (Step 24), and enters a process for communication connection between mobile station base stations in response to an incoming call notification signal from the base station (step 25).

If a predetermined time has elapsed while waiting for an incoming signal from the base station (step 26), the mobile station / base station communication control unit 14b alternates the mobile station communication carriers 1 to 3 alternately. Is instructed to the channel codec unit 13 (step 27), and each carrier enters a state of waiting for an incoming signal from another mobile station for a certain period of time. When an incoming signal from another mobile station is received through the channel codec unit 13 (step 2).
8) After decoding the data, the mobile station / base station communication control unit 14b instructs the channel codec unit 13 to transmit control data on the mobile station communication carrier (step 29), and performs another mobile operation. In response to an incoming signal from the station, a process for communication connection between two mobile stations is started (step 30).

When a predetermined time has elapsed while waiting for an incoming signal from another mobile station (step 30A), the mobile station / base station communication control unit 14b sets all three mobile station communication carriers. It is determined whether or not it has been received (step 3
0B) If all three signals have been received, then the channel codec unit 13 sends an instruction to receive a control carrier for base station communication.
(Step 22), if less than three,
An instruction to receive the remaining carriers for mobile station communication is issued to channel codec section 13 (step 27).

Next, the standby operation of the channel codec unit 13 in the direct communication between mobile stations will be described with reference to FIG. When receiving the instruction to receive the control carrier for base station communication from the mobile station / base station communication control section 14b of the control section 14 (step 31), the base station sets the control carrier for base station communication, Waits for reception. When the incoming data from the base station is received (step 33), the data is stored in the temporary storage memory 15 (step 34), and the next instruction is awaited from the control unit 14. After a lapse of a fixed time, when an instruction is received from the mobile station / base station communication control unit 14b of the control unit 14 to receive the mobile station communication carriers 1 to 3 (step 35), the mobile station communication Set carriers 1 to 3 (step 36),
Wait for an incoming signal from another mobile station. When receiving incoming data from another mobile station (step 37), the data is stored in the temporary storage memory 15 (step 38), and the next instruction is waited for from the control unit 14. After a lapse of a certain time, when an instruction is received from the mobile station / base station communication control unit 14b of the control unit 14 to receive the remaining carriers 1 to 3 for mobile station communication (step 39). After setting the remaining carriers for mobile station communication, the system waits for an incoming signal from another mobile station (step 36). Next, the control unit 14
When an instruction to receive a base station communication control carrier is received from the mobile station / base station communication control unit 14b (step 40), the base station communication control carrier is set (step 32). ), And waits for reception from the base station.

FIG. 4 is a timing chart showing the above operation. The timing chart of FIG. 4 shows the reception timing of each carrier when an incoming signal cannot be received from the base station or the mobile station. In FIG. 4, after receiving a carrier for controlling a base station 41, receiving a carrier 1 for a mobile station, and receiving a carrier 2 for a mobile station.
The order of the receiving step 43 and the mobile station carrier 3 receiving step 44 is performed at a constant carrier receiving cycle Ta,
The operation of returning to the base station control carrier reception step 41 is repeated.

The reception of the carrier for controlling the base station is performed as follows.
It is desirable that the control is performed at every carrier reception cycle Ta similar to the timing chart of the conventional example shown in FIG. 14 in accordance with the transmission timing of the control carrier transmitted from the base station. Therefore, in the communication between the base station and the mobile station, the time period during which the control carrier for the base station is not received is used.
It is the same as receiving one carrier for mobile stations.
In the example shown in FIG. 4, three carrier receptions for mobile stations are divided into three equal parts while no carrier for base station control is being received. May be repeated several times.

(Embodiment 2) Next, a second embodiment of the present invention will be described. The second embodiment has the same configuration as that of the first embodiment shown in FIG. 1, and receives a control carrier for base station communication and a carrier for mobile station communication when waiting for direct communication between mobile stations. In addition to the three receptions, the mobile station / base station communication control unit 14b instructs the channel codec unit 13 about the period during which the reception is turned off.

FIG. 5 shows the operation of the control unit 14 during standby in the direct communication between mobile stations according to the second embodiment, and FIG. 6 shows the operation of the channel codec unit 13 at that time.
In the operation of the control unit 14 in FIG.
0B is the same as Steps 21 to 30B in FIG. 2, and in the operation of the channel codec unit 13 in FIG. 6, Steps 61 to 69 correspond to Step 3 in FIG.
Same as 1 to 39. The difference is that three carriers for mobile station communication are received (step 60B,
69) The control unit 14 instructs the channel codec unit 13 to turn off the reception (steps 60C and 70), and after a lapse of a fixed time (step 60D), the channel codec unit 13
Turns off the reception (step 70A), returns to the original state, and instructs the channel codec section 13 to receive the control carrier for base station communication (steps 52 and 61).

FIG. 7 is a timing chart of the operation in the second embodiment. In FIG. 7, after the carrier receiving step 71 for controlling the base station, the carrier 1 receiving step for the mobile station 72, the carrier 2 receiving step 73 for the mobile station, the carrier 3 receiving step 74 for the mobile station, and the receiving off step 75 Is a constant carrier reception cycle Ta
In order within. The time t of the reception-off step 75 is determined so that the cycle of receiving the control carrier for base station communication including this time t becomes Ta. By providing such a reception off time t, the current consumption of the internal battery of the mobile station during standby can be reduced.

(Embodiment 3) Next, a third embodiment of the present invention will be described. The third embodiment is similar to the first embodiment shown in FIG.
When the mobile station moves out of the range of the base station to be paired with and cannot receive the control carrier having a fixed period from the base station, the mobile station moves almost out of the range of the base station. The mobile station / base station communication control unit 14b of the control unit 14 instructs the channel codec unit 13 to receive the mobile station communication carrier and the base station communication carrier in the same carrier reception cycle. It was made.

FIG. 8 is a timing chart of a standby operation in direct communication between mobile stations according to the third embodiment.
Carrier 1 for mobile station receiving step 81, Carrier 2 for mobile station receiving step 82, Carrier 3 for mobile station receiving step 83, and Carrier for base station control receiving step 84 are sequentially performed at a fixed carrier receiving cycle Ta. ing. In this way, by waiting at the same carrier reception period Ta as the timing when receiving the control carrier from the base station, the mobile station communication carrier can be received regardless of whether the control carrier has been received from the base station. When the mobile station moves out of the area of the base station, when the mobile station moves into the area again, an incoming call notification from another mobile station and an incoming call notification from the base station are immediately transmitted. In addition to being able to receive, the average time of communication connection during direct communication between mobile stations can be kept constant.

In the present embodiment, as shown in the timing chart of FIG. 9, a carrier 1 for mobile station receiving step 91, a carrier 2 for mobile station receiving step 92,
After the receiving step 93 for the carrier 3 for the mobile station and the receiving step 94 for the control for the base station control, a receiving off step 95 is provided within a fixed carrier receiving cycle Ta so as to reduce the current consumption of the internal battery of the mobile station. It may be. Also, the control carrier for base station communication is not received every fixed carrier reception cycle Ta, but is received once every several cycles, that is, several times Ta. Often, in this case, the current consumption of the built-in battery can be further reduced.

[0038]

According to the present invention, as is apparent from the above embodiment, means for alternately receiving an incoming signal from a base station and an incoming signal from another mobile station in a standby state of a mobile station is provided. Has the following effects. 1. Even in a standby state for communication between other mobile stations, an incoming call from a connectable base station can be received, so even when a plurality of mobile stations are in a standby state for communication between mobile stations to perform communication between mobile stations. It can receive incoming calls from base stations. For example, the present invention can be used for the purpose of utilizing communication between mobile stations for communication within a premises and receiving an incoming call from an external telephone line. 2. By providing a period during which the control carrier for base station communication and the control carrier for mobile station communication are alternately received and the reception is turned off, even when both the base station and mobile station are waiting for an incoming call, the built-in mobile station Battery consumption can be reduced. 3. Because the monitoring is performed regardless of whether the control carrier from the base station has been received, even if the mobile station moves out of the area of the base station, when the mobile station moves into the area again, an incoming call notification from another mobile station is immediately received. An incoming call notification from the base station can be received.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a digital cordless telephone device according to a first embodiment of the present invention.

FIG. 2 is a flowchart of a control unit in a digital cordless telephone device according to a first embodiment of the present invention during a standby operation for direct communication between mobile stations;

FIG. 3 is a flowchart of a channel codec unit in a digital cordless telephone apparatus according to a first embodiment of the present invention during a standby operation for direct communication between mobile stations;

FIG. 4 is a timing chart of a digital cordless telephone device according to the first embodiment of the present invention at the time of an operation for waiting for direct communication between mobile stations;

FIG. 5 is a flow chart of a control unit in a digital cordless telephone apparatus according to a second embodiment of the present invention during an operation for waiting for direct communication between mobile stations.

FIG. 6 is a flowchart of a channel codec unit in a digital cordless telephone apparatus according to a second embodiment of the present invention during a standby operation for direct communication between mobile stations.

FIG. 7 is a timing chart of a digital cordless telephone device according to a second embodiment of the present invention at the time of an operation for waiting for direct communication between mobile stations;

FIG. 8 is a timing chart of a digital cordless telephone apparatus according to a third embodiment of the present invention at the time of an operation for waiting for direct communication between mobile stations.

FIG. 9 is another timing chart at the time of an operation for waiting for direct communication between mobile stations of the digital cordless telephone device according to the third embodiment of the present invention;

FIG. 10 is a schematic block diagram of a digital cordless telephone device in a conventional example.

FIG. 11 is a conceptual diagram of a TDMA / TDD transmission method.

FIG. 12 is a configuration diagram of a burst signal transmitted wirelessly in the TDMA / TDD system;

FIG. 13 is a flow chart of a digital cordless telephone device in a conventional example when a mobile station stands by for communication between a base station and a mobile station;

FIG. 14 is a timing chart of a digital cordless telephone device in a conventional example when a mobile station stands by for communication between a base station and a mobile station;

FIG. 15 is a flow chart of a digital cordless telephone apparatus in a conventional example at the time of a mobile station direct communication standby operation of a mobile station.

FIG. 16 is a timing chart of a digital cordless telephone apparatus in a conventional example at the time of a mobile station waiting operation for direct communication between mobile stations.

[Explanation of symbols]

 A Base station 1 Antenna 2 Radio circuit 2a Synthesizer 3 Radio control unit 4 Temporary storage memory 5 Call / line control unit 6 Line 7 Channel codec unit 8 Control unit B Mobile station 10 Antenna 11 Radio circuit 11a Synthesizer 12 Radio control unit 13 Channel codec Unit 14 Control unit 14a Communication control unit for base station 14b Communication control unit for mobile station and base station 15 Temporary storage memory 16 Call control unit 17 Receiver 18 Microphone 19 Operation unit 20 Display unit

Continued on the front page (72) Inventor Naoya Morita 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Inventor Tomoko Takano Tsunashima-Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture 4-3-1, Matsushita Communication Industrial Co., Ltd. (56) References JP-A-6-338852 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H04B 7/24-7 / 26 H04M 1/725 H04Q 7/00-7/38

Claims (3)

(57) [Claims] 1. A TDMA / TDD system for performing communication by time division multiplex access and time division bidirectional transmission,
Transmitting a base station for transmitting a notification signal at a constant period at the time of waiting, the notification signal at the time of waiting, even if communicating with other mobile stations, even when communicating with the base station does not transmit a notification signal when placing In a digital cordless telephone device comprising a base station and a base station capable of performing inter-mobile-station communication and direct communication between mobile stations, when a mobile station waits for direct communication between mobile stations, the base station operates at a fixed carrier reception period. and control means for monitoring alternating notification signal and the notification signal from another mobile station from the station, and a channel codec unit performing assembly and disassembly of data transmitted and received by radio communication channel and the control channel , and a memory for temporarily storing data received from the channel codec, the mobile station performs intermittent reception in synchronism with the notification signal from the base station, between a mobile station direct communication At the time of waiting, from the base station
A period of monitoring a notification signal, and the period for monitoring a notification signal from another mobile station, provided the period of stopping the monitoring constant carrier reception period, also, mobile station, versus the base station If the communication control carrier set <br/> data reception I line Do, sent from pairs base station when the received data is temporarily stored into the memory, then the data received
Synchronize reception timing according to communication data
The digital cordless telephone device performs the operation described above every time data is received . 2. A TDMA / TDD system for performing communication by time division multiple access and time division bidirectional transmission,
Transmitting a base station for transmitting a notification signal at a constant period at the time of waiting, the notification signal at the time of waiting, even if communicating with other mobile stations, even when communicating with the base station does not transmit a notification signal when placing In a digital cordless telephone device comprising a base station and a base station, which can perform inter-mobile-station communication and inter-mobile-station direct communication, the mobile station performs a base station operation at a fixed carrier reception period when waiting for direct communication between mobile stations. a control means for monitoring a notification signal from the notification signal and another mobile station from station alternately, mobile station, in the carrier receiving period Ta, when the standby operation in the communication between the mobile station directly, for mobile the carrier receiving station performs a plurality of times, then, the digital cordless telephone apparatus and performs an operation to execute the carrier receiving control vs. base station in sequence. 3. A TDMA / TDD system for performing communication by time division multiple access and time division bidirectional transmission,
Transmitting a base station for transmitting a notification signal at a constant period at the time of waiting, the notification signal at the time of waiting, even if communicating with other mobile stations, even when communicating with the base station does not transmit a notification signal when placing A digital cordless telephone device, comprising a base station and a mobile station, capable of performing communication between mobile stations and direct communication between mobile stations, wherein the mobile station waits for direct communication between mobile stations within a certain carrier reception period Ta. in the operation of monitoring and notifications signals from notification signal and another mobile station from the base station alternately
A control unit for controlling the mobile station performs the intermittent reception in synchronism with the notification signal from the base station, when waiting between the mobile station direct communication, the base station
A period of monitoring a notification signal, and the period for monitoring a notification signal from another mobile station, provided the period of stopping the monitoring to the constant carrier reception period Ta, also counter-base-station communication receiving the control carrier, characterized in that as said is not performed every time every predetermined carrier reception period Ta, perform one-to base station control carriers received communication to several times the number period or Ta digital Cordless telephone device.