JPH10276476A - Cordless telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer the same message contents to plural hand sets without troubling a transmitter by preserving data, which are to be reported to the other hand sets, in a memory and automatically originating a call to the other hand sets at any arbitrary time point when directly performing talking between hand sets without interposing a base unit. SOLUTION: Based on initialize data previously stored in a memory 1, the entire system is initialized according to the command of CPU 10. Next, when the hand set is set in a transceiver (inter-hand set direct speaking) mode, transmission data such as voice mail or message are registered. After that registration is completed, the hand set starts a call termination control sequence to the first hand set on a transmission destination list, which is previously stored in a memory 11, showing the order of transmission destinations for the voice mail or message. When the call origination/termination control sequence is made successful, its time is stamped in the memory 11. Afterwards, the hand set, for which the call origination/termination control sequence is made successful, is excluded from the transmission destination list stored in the memory 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transceiver function for directly communicating between a plurality of slave units in a cordless telephone system in which a slave unit communicates wirelessly with a base station or a master unit.

[0002]

2. Description of the Related Art In recent years, portable telephones (PHS) have rapidly become widespread. The PHS is a system in which a person who carries a terminal (slave unit) can use a telephone via a base station connected to a public line network in a station premises or a downtown area, like a public telephone. By the way, the PHS has another function called a transceiver mode in which a handset communicates directly between handset without passing through a base station. This is the PHS cordless telephone system standard (RC
This is a function based on RSTD-28), and the transceiver mode can be used between slaves that have registered the slave ID for the same base station or master.

[0003]

However, although it is possible to register a plurality of (two or more) slave unit IDs for the same base station or master unit, when talking in the transceiver mode, the current situation In this case, only one-to-one communication between slave units is possible. That is, the contents carried by one slave unit cannot be simultaneously received by a person carrying two or more slave units. Therefore, when it is desired to notify a plurality of opponents of their own intention, it is necessary to repeat notifying each opponent of his / her own intention. Therefore, if at least one person is outside the talkable area (0 to 400 m in straight line distance),
Since you can't make calls, wait for them to enter the wireless call area to notify them of your intentions,
Alternatively, it was necessary to repeat the call periodically.

[0004] For example, when a PHS slave is taken outdoors, for example, at a ski resort, and direct communication between slaves is used, it is conceivable that the PHS is used in an area other than the area where the slaves can talk. In this case, the calling operation must be repeated many times until the connection can be established. The present invention has been made in view of the above-described problems, and has been developed by using a PHS transceiver mode.
The contents of the message to be sent from one slave unit are stored in memory as voice mails and messages that can be played back and viewed on the receiving side, and the caller is automatically transferred to multiple slave units sequentially to identify the sender. An object of the present invention is to provide a cordless telephone system in which the same message content is transferred to a plurality of slave units without bothering.

[0005]

According to the first aspect of the present invention, there is provided a cordless telephone system for performing a call between slave units without passing through a master unit, a memory for storing data in the slave unit, an output unit for outputting data, Control means for controlling each of them, the control means stores data to be notified to other slave units in a memory when a direct call is made between slave units without passing through a master unit, and at a predetermined time And automatically sends the call to another handset.

According to a second aspect of the present invention, in the cordless telephone system according to the first or second aspect, when the interface in the wireless section conforms to the second generation cordless telephone system standard, the data notification is sent to a predetermined number. It is characterized in that it is performed using the option area of the function channel.

According to a third aspect of the present invention, in the cordless telephone system according to the first or second aspect, when the interface in the wireless section conforms to the second generation cordless telephone system standard, various data notifications are sent. The method is characterized in that it is performed using a channel in which a channel identification code representing a type of a channel is set as an option.

[0008]

In a cordless telephone system for performing a call between slave units in a transceiver mode, data (such as viewable voice mails and messages) stored in a memory in the slave unit is sequentially transmitted to another slave unit at predetermined time intervals.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In describing a method of transmitting transmission data such as a voice mail or a message in a direct call between slave units in a transceiver mode of a cordless telephone system used in an embodiment of the present invention, an RCR ST will be described.
An outline of a form of direct communication between slave units conforming to D-28 will be described. First, the handset can communicate with the base station connected to the public network via radio, and if a plurality of handset IDs are registered in the same base station, the handset does not go through the base station in the transceiver mode. One-to-one direct communication between slave units is possible.
The control of the communication channel between the base station and the handset or between the handset and the handset is performed according to each mode, and the call is executed.

[0010] According to RCR STD-28, in a direct telephone call between slave units, a system in which a dedicated control channel is not provided and a calling side detects an empty slot of a communication channel and initiates a call, and a called side scans all channels. Is adopted.
PHS direct communication channel between handsets is 1895.15M
Hz is assigned to 1 to 10 channels on a 300 kHz wireless channel with a channel interval of 1 channel. When a call operation is performed, 10 channels are assigned to any available channel from the calling terminal at regular intervals. When the called terminal detects a destination identification code for its own handset in a specific receiving channel, the called terminal performs a control sequence according to RCR STD-28 on that channel and enters a talking state. .

The functional channels used for direct communication between slave units include SCCH (individual cell channel) as a control channel, TCH (information channel) and FACCH (high-speed associated control channel) as communication channels. T
CH transfers user information and a user information control signal,
It is a point-to-point bidirectional channel. FACC
H is a channel for performing high-speed data transfer by temporarily stealing the TCH. The SCCH is a channel used when a slave unit establishes a direct call connection between slave units to another slave unit, and performs a call, a response, a setting of a protocol type, and the like.

FIG. 1 shows a coding format of SCCH, TCH and FACCH. FIG.
(A) shows the format of the SCCH, in which R (4
Bit) represents a transient response ramp time that guarantees a burst rise time, SS (2 bits) is a start symbol, PR (62 bits) is a preamble for reproducing a clock signal from a received signal to establish bit synchronization, UW (32 bits) is a unique word composed of frame synchronization words, CI (4 bits) is a channel identification code (called CI or CI code) representing the type of various channels, and the next destination identification code (42 bits) is Information having a system call code common to the registered master units and a slave unit call number, which is the number of the slave unit to be called, and a caller identification code (28 bits) indicate the own unit that is calling. Information having a handset calling code indicating a number, the next I (62 bits) is SCCH information,
RC (16 bits) is an error check bit.

FIG. 1 (b) shows the format of the TCH. SA (16 bits) is SACCH (slow associated control channel) information, I (160 bits) is TCH information, and other elements are shown in FIG. 1 (a). ). FIG.
(C) is the format of FACCH, and I is FACCH
CH information, and other elements are the same as those in FIG.

FIG. 2 is a conceptual diagram when a direct telephone call is made between the slave units in the transceiver mode in the cordless telephone system according to the embodiment of the present invention. As described above, in order to make a direct call between a plurality of slave units, it is necessary for a plurality of slave units to perform subscriber registration work for one master unit, and each slave unit has already registered an ID number. It is assumed that First, FIG.
FIG. 2A shows a state diagram when four slave units PS1 to PS4 are communicating in the same wireless communication area, and FIG.
(B) shows a state diagram when, for example, one handset (PS2) moves out of the wireless communication area. The slave unit used here has a circuit configuration as shown in FIG.
The outline will be described below.

First, in FIG. 3, a radio unit 2 receives a reception signal from an antenna 1 via an antenna switch (not shown) for distributing transmission / reception, for example, 1.9 GHz.
From the band through 1stIF, 2ndIF
The signal is frequency-converted into an F signal, and this IF signal is
Output to The modulation / demodulation circuit 3 demodulates the signal of π / 4 shift QPSK, demodulates the IF signal input from the receiving unit side of the radio unit 2 and separates it into IQ data.
The IQ data is output to the digital signal processing unit 4 as a serial data string. The digital signal processing unit 4 performs frame synchronization and data transmission / reception processing. The digital signal processing unit 4 extracts a unique word (synchronization signal) from the received data sent from the modulation / demodulation circuit 3 to establish frame synchronization. The control data portion and the audio data portion in the received data are descrambled, and the control data is output to the data processing section 8 and the audio data is output to the audio processing section 5.

The ADPCM audio signal (4 bits × 8 kbit = 32 bits) sent from the digital signal processing unit 4
kbps) is converted to a PCM audio signal (8 bits × 8 kHz = 6).
4 kbps), decompressed and output to a PCM codec (not shown). A PCM audio signal sent from the PCM codec is D / A converted, an analog audio signal is amplified by an amplifier, and output from the speaker 7 as an audio signal of a predetermined level.

On the other hand, the analog audio signal input from the microphone 6 is A / D-converted by the audio processing unit 5 and the PCM audio signal is output to the PCM codec. Further, based on a control signal from the digital signal processing unit 4, the control unit controls an amplification factor of an amplifier, a ringer, and a tone signal. The PCM audio signal sent from the PCM codec is compressed by encoding it into ADPCM and output to the digital signal processing unit 4.
Also, transmission data is created by adding control data to the audio data transferred from the PCM codec, scrambled and the like, and then added with a unique word and the like, formatted, and inserted at a predetermined timing of the TDMA frame. It is sent to the modulation / demodulation circuit 3.

The modulation / demodulation circuit 3 creates IQ data from the transferred data string, modulates the data by π / 4 shift QPSK based on the IQ data, and outputs the modulated data to the transmission section of the radio section 2.
The radio unit 2 converts the frequency of the π / 4-shifted QPSK modulated wave input from the modulation / demodulation circuit 3 into a 1.9 GHz band by mixing it with a local oscillator of a predetermined frequency by a two-stage mixer, for example. From the antenna 1. In addition, the data processing unit 8 sends display data to the display device 9 based on a command from the CPU 10 and performs necessary display. The CPU 10 is connected to a ROM in which an initial operation program and specified values of the slave unit are stored, and a memory 11 composed of a RAM for temporarily storing data processed by the data processing unit 8.

FIG. 4A is a transmission / reception control sequence when a call is made between the slave units in the transceiver mode in the cordless telephone system according to the embodiment of the present invention.
(B) shows a wireless communication channel disconnection control sequence. In order to make it easier to understand the relationship between the transmitting and receiving sub units, the transmitting sub unit and the receiving sub unit will be described as PS1 and PS2 as shown in FIG. First, (1) PS1 is
A plurality of channels, for example, 10 channels, for pre-assigned communication between handset units are sequentially scanned, and a call signal is transmitted to a vacant slot to call PS2. next,
(2) PS1 and PS2 send and receive a synchronization signal to start establishing a call. (3) When a call switch is turned on to perform a call between the slave units of PS2, a response signal is transmitted from PS2 to PS1.

Next, (4) TC1 between PS1 and PS2
After the transmission and reception of the idle burst signal of the transmission channel through H, the communication between the slave units becomes possible, and thereafter, the communication between them is performed. 4A, (1), (2),
All operations in (3) are performed through the SCCH. FIG. 4 (b) shows that when the wireless communication channel is released, P
The cutting sequence performed from S1 to PS2 is shown. If the PS1 disconnects the wireless communication channel, the FA
This is performed using CCH. That is, the wireless communication channel disconnection message is registered in the call control area of the FACCH message type and transmitted to the PS2. Upon receiving the radio communication channel disconnection message from PS1, PS2 registers a radio communication channel disconnection completion message in the call control area of the FACCH message type, and releases the radio communication channel by transmitting to PS1. Done.

FIG. 5 is a flowchart showing the operation performed by the CPU 10 on the transmitting side when a voice mail or a message is transmitted to a plurality of parties in a direct call between the slave units in the transceiver mode. First, in step S1, the memory 1
1 based on the initialization data stored in advance
Initialization of the entire system is performed by 10 commands. Next, the process proceeds to step S2 to determine whether or not the slave unit is in the transceiver (direct communication between slave units) mode. If not in transceiver mode (step S2: NO)
Proceeds to step S4, performs the normal telephone mode processing, and then proceeds to step S2 again to monitor the transceiver mode. If the mode is the transceiver mode (step S2: YES), the process proceeds to step S2.
In step 3, transmission data such as a voice mail or a message is registered.

Here, registration of transmission data will be described. In the present embodiment, registration of transmission data is performed using the option area of the function channel. For example, FACCH can be used. FACCH is a channel that can secure an optional area that users can use freely.
As shown in FIG. 10, an 8-bit protocol identifier and a message type are assigned to the message format.
By assigning to 1), the area of another information element can be secured as a message area for options. In this embodiment, the option area is secured on the FACCH message in this way, and the processing of step S3 is executed by registering the transmission data therein.

Next, when the slave unit completes registration of transmission data such as a voice mail or a message, in step S5, the slave unit changes the order of the transmission destination of the voice mail or the message stored in the memory 11 in advance. An incoming call control sequence is started for the first slave unit in the indicated destination list. At the same time, a message indicating that the mail mode is set to the slave unit of the transmission destination, for example, a message indicating that the mail mode is set in the option area on the SCCH is registered, and FIG.
(A) (1) The notification is made by transmitting the call message at the time of transmission. FIG. 11 shows the message format. As shown in the figure, the SCCH is a function channel having an optional area, and the originating handset writes the mail mode in this area and sends it to the calling side handset to send it in the mail mode. Notify that there is.

Next, in step S6, it is determined whether or not the outgoing / incoming call control sequence is successful. If the transmission / reception control sequence is successful (step S6: YES), the process proceeds to step S8, and the time when the transmission / reception control sequence is successful is stamped in the memory 11. By confirming the stamped time later on the transmitting side, it is possible to confirm whether or not transmission to the other party has been completed. Then, step S9
Then, the slave unit for which the transmission / reception control sequence has succeeded is removed from the transmission destination list stored in the memory 11. Then, in step S10, the outgoing / incoming call control sequence succeeds for all slave units listed in the transmission destination list,
It is determined whether or not the transmission has been completed. If the transmission has been completed (step S10: YES), a series of operations ends.

If not completed (step S1)
(0: NO), the process proceeds to step S11, and the transmission / reception control sequence is started for the next child device in the transmission destination list. After that, the process shifts to step S6, and steps after step S6 are executed. Further, when the calling / receiving control sequence is not successful in step S6 (step S6).
6: NO) proceeds to step S7 to set the slave unit to the power saving mode.

When the continuous communication time is limited as in PHS, when a predetermined time limit is reached,
After terminating the communication and taking a predetermined pause period, the calling side automatically initiates a call again and reconnects with the called side, so that calls and responses related to reconnection can be made. A method of continuing communication while simplifying the troubles such as the above is called a power saving mode. The power saving mode in step S4 is a suspension period (for example, 2 seconds), and waits for an incoming call from another slave unit in the transceiver mode state to perform battery saving or the like. Thereafter, the process proceeds to step S11, in which a calling / receiving control sequence is started for the next slave in the destination list. The processes in steps S6 to S11 are performed until the transmission / reception control sequence is successful for all the slaves listed in the transmission destination list and the transmission is completed (step S6).
10: YES).

FIG. 6 is a flowchart of the operation performed by the CPU 10 on the receiving side. First, in step S1, the entire system is initialized as in the case of the transmitting side. Next, the process shifts to step S2 to check whether or not a transceiver (direct communication between slave units) mode is set. If the mode is not the transceiver mode (step S2: NO), the process shifts to step S4 to perform the normal telephone mode processing, and then shifts to step S2 again to monitor the transceiver mode. At this time, if it is in the transceiver mode (step S2: YE
In S), the process shifts to step S3 to check whether there is an incoming call from another slave unit. If there is no incoming call from another child device (step S3: NO), the confirmation is continued.

If there is an incoming call from another handset (step S3: YES), the process proceeds to step S6.
It is determined whether or not the notification of the mail mode has been received from the calling side slave unit. If there is no notification of the mail mode (step S6: NO), the process proceeds to step S5, and the processing in the normal transceiver mode is performed. The process then proceeds to step S2 to check the transceiver mode. If it is determined in step S6 that the mail mode has been notified (step S6: YES), the process proceeds to step S6.
7, the received data is displayed on the display device 9 or output from the speaker 7 in the case of voice. That is, received data (such as a voice mail or a message) is output as sound through the digital signal processing unit 4, the voice processing unit 5, and the speaker 7, or is output as an image through the data processing unit 8 and the display device 9. Thereafter, the process proceeds to step S2, and the steps after step S2 are repeated.

FIG. 7 shows a case where a call is made between three slave units (PS1 to PS4) from the calling side (PS1) when a call is made between the slave units in the transceiver mode in the cordless telephone system according to the embodiment of the present invention. 2) specifically shows a communication sequence when a message is sequentially transferred. FIG. 8 shows a case where the above communication sequence has failed. Here, a method of transmitting a voice message in the transceiver mode in the cordless telephone system according to the embodiment of the present invention will be described in detail with reference to FIGS. Note that the initial state of the transmission destination list in the memory of the sender (PS1) is as shown in FIG. 9A.

First, in (1) of FIG. 7, PS1 is
The transmission / reception control sequence shown in FIG. 4A is performed on the PS2 at the beginning of the transmission destination list in FIG. 9A. At this time, when the paging message is transmitted, as described above, PS1 uses the option area of the SCCH to notify that it is in the mail mode using PS2. At the same time, PS
1 is a timer (T) provided in the CPU 10 in the slave unit.
A continuous call possible time set in advance by 1), for example, counting of 3 minutes is started. When PS1 and PS2 enter the direct communication state (2), PS1 transmits transmission data such as voice mail or message to PS2. Then, when the expiration of the three-minute continuous talkable time by the count of the timer in PS1 is recognized, PS2 is notified to FIG.
The disconnection control sequence (3) shown in (b) is performed.

At the same time, the PS 1 starts counting a pause period, for example, 2 seconds, between the slave units, which is set in advance by a timer (T2) in the slave unit. When the expiration of the 2-second pause period by the count of the timer in the PS1 is recognized, the transmission / reception control sequence (4) is performed for the next transmission destination PS3 based on the transmission destination list. Less than,
The operations of (1) to (4) are performed for each PS in the transmission destination list.
Do for

In FIG. 8, when PS1 attempts an outgoing / incoming call control sequence with respect to PS2, which is the first transmission destination, and PS2 is not in the wireless communication area during the communication between the slave units (FIG. 2 (b) If the outgoing / incoming call control sequence (1) fails due to, for example, the state shown in (1)) or the like, PS1 sets the pause period of the inter-subunit communication set in advance by the timer (T2) in the own subunit, for example, 2 seconds. Start counting. PS
When the expiration of the 2 second rest period by the count of the timer in 1 is recognized, the transmission / reception control sequence (2) is performed for the next transmission destination PS3. Here, if the transmission / reception control sequence fails again, PS1 starts counting by the timer (T2) in its own handset. Then, when the expiration of the 2-second pause period by the count of the timer in PS1 is recognized, the transmission / reception control sequence (3) is performed for PS4 as the next transmission destination.

In this case as well, if the outgoing / incoming / outgoing call control sequence fails, PS1 starts counting the timer (T2) in its own handset. When the expiration of the 2-second pause period by the count of the timer in PS1 is recognized, there is no new destination in the destination list (FIG. 9A).
Returning to the top, the transmission / reception control sequence is performed again on the transmission destination remaining in the transmission destination list, that is, the transmission destination PS2 for which the transmission / reception control sequence has not been successful. Here, if the transmission / reception control sequence (4) succeeds, the communication state between the slave units is established. At this time, after notifying the PS2 of the mail mode, transmission data such as a voice memo or a message is transmitted.

At the same time, PS1 is a continuous call possible time set in advance by a timer (T1) in its own handset,
For example, a three minute count is started. And PS1 is P
Remove S2 from the destination list. As a result, the destination list is as shown in FIG. When the expiration of the three-minute continuous callable time by the count of the timer in PS1 is recognized, the disconnection control sequence (5) is performed on PS2.
At the same time, PS1 starts counting the pause period of the inter-slave unit communication set in advance by a timer (T2) in the slave unit.

When the expiration of the 2-second pause period by the count of the timer in PS1 is recognized, the transmission / reception control sequence (6) is performed again on PS3. However, if the transmission / reception control sequence fails, PS1 starts counting the timer (T2) in its own handset. When the expiration of the 2 second rest period by the count of the timer in PS1 is recognized,
The transmission / reception control sequence (7) is performed again for PS4. Also in this case, if the outgoing / incoming call control sequence fails, PS1 starts counting the timer (T2) in its own handset. When the expiration of the two-second pause period by the count of the timer in PS1 is recognized, the transmission / reception control sequence (8) is performed on PS3 again. In this case, since the outgoing / incoming call control sequence is successful, PS1 and PS2 are in a direct communication state (communicating), and PS1 notifies PS2 that it is in the mail mode. Send outgoing data.

Thereafter, PS1 removes PS3 from the transmission destination list. As a result, the transmission destination list becomes as shown in FIG. Then, when the expiration of the three-minute continuous talkable time by the count of the timer in PS1 is recognized, the disconnection control sequence (9) is performed on PS3. In the following, a series of transmission / reception control sequences performed for PS3 are also performed for PS4, so that transmission data such as voice mail or messages is transmitted from the sender (PS1) to the recipients (PS2 to PS4). The transfer is completed. In the above description, an example in which transmission data such as a voice mail or a message is sequentially transferred from one slave to three slaves has been described. It can be performed simultaneously with the outgoing / incoming call control sequence.

Also, in the examples of FIGS. 7 and 8, PS1 recognizes the expiration of the predetermined continuous talkable time (T1), and
Although the disconnection control sequence is performed for S2, the disconnection sequence may be performed when transmission data such as a voice mail or a message has been transmitted. Further, in this embodiment, when notifying that the mail mode is set from the calling side handset to the called side handset, the SCCH
The method using FACCH when transmitting transmission data such as voice mails and messages has been described above. However, the present invention is not limited to this method, and other methods can be used by using a function channel that can secure an optional area that can be used freely by the user. But it is feasible.

For example, it is also possible to use a function channel used when making a call via a base station, instead of a direct call between slave units. FIG. 12 shows coding formats of various channels used when making a call via a base station, and there are six types of formats.

FIG. 12A shows a downlink broadcast channel (hereinafter referred to as BCCH) and a paging channel (hereinafter referred to as PCH).
The first R (4 bits) represents a transient response ramp time that guarantees a burst rise time, SS (2 bits) is a start symbol, and PR (62 bits) is a value from a received signal. Preamble for reproducing clock signal and establishing bit synchronization,
UW (32 bits) is a unique word composed of a frame synchronization word, and CI (4 bits) is a channel identification code (called a CI code) indicating the type of each channel shown in FIG. The next source identification code (42 bits) is the identification code of the base station on the transmitting side, and the next I (62 bits) is BCC
H or PCH information, and CRC (16 bits) is an error check bit.

FIG. 12 (b) shows an uplink dedicated cell channel (hereinafter referred to as SCCH). This format is provided with a destination identification code (28 bits) which is not included in the above (a). This is the identification code of the other party (base station), and the identification code of the mobile station is set as the source identification code.
The downlink SCCH of (c) is a channel for transmitting information for signal control transmitted from the base station to the slave unit, and the positions of the destination identification code and the source identification code are opposite to those of the downlink SCCH of (b). It has become. (D) is an uplink user packet channel (hereinafter referred to as USCCH), and (e),
(F) is the downlink USCCH.

FIG. 13 (a) shows an uplink synchronization burst, which has the same structure as R, SS, and R in FIG. 12 (b) and (d).
The PR, UW, CI, destination identification code, and calling identification code are set. Upward idle bits are provided in the subsequent 34 bits, and CRC (16 bits) is set last.
13 (b) has the same configuration as the uplink synchronization burst, and (c) and (d) show the user packet channel (hereinafter referred to as USPCH) and (e) the high-speed associated control channel. (Hereinafter referred to as FACCH) is a channel that can be used during communication, and is capable of transmitting user information as well as call control and wireless information. In this format,
The portion of the low-speed associated control channel (hereinafter, referred to as SACCH) after the CI transmits a control signal during communication by combining with the SACCH of the subsequent frame in 5 ms, and transmits the I (16)
The (0 bit) portion is used as FACCH information for transmitting a control signal interrupted during communication at high speed.

FIG. 12 (f) shows an information channel (hereinafter referred to as TCH) for transmitting traffic information or a VOX function for transmitting voice (or low-speed data) (transmission output is turned ON / OFF depending on the presence or absence of voice). OFF: hereinafter referred to as a VOX) channel. In the I (information) portion of this format, 160-bit voice or traffic information is set in hardware at the time of transmission. Where TCH is
A point-to-point bi-directional channel that transfers user information and user information control signals. As described above, the USCCH of (d), (e), and (f) shown in FIG.
The USPCHs (c) and (d) shown in FIG. 13 are both point-multipoint bidirectional channels and are provided for transmitting control information, user packet data, and the like, and can be used freely by the user. This is an optional channel that can be used. By using the above function channel, for example, by the method described below, the CPU 10
In the control sequence compliant with TD-28, the transmitting handset can notify the receiving handset that it is in the mail mode, and can transmit transmission data such as voice mail and messages.

That is, one method is to use an optional area of a functional channel. As a method of using the option area of the function channel, for example, the above-described FAC
There is a method of putting information to be notified in a CH / SACCH message. As shown in FIG. 14, the FACCH / SACCH message format is provided with an 8-bit protocol identifier and a message type. When the upper three bits of the message type are assigned to (011), a message area for an option is provided. An area that can be used freely can be secured. Therefore, FIG.
If the message type of item 4 is designated as an option, arbitrary information can be put in other information elements of FIG.
Information to be notified and transmission data may be put in the other information elements.

Further, information to be notified to USCCH / USPCH and transmission data may be inserted, and if a function channel has an optional area, information to be notified may be inserted into the area. Further, as another method of notifying the receiving-side slave unit that the sending-side slave unit is in the mail mode and transmitting transmission data such as voice mail and messages, the above-described various types of channels are used. There is a method of using a channel in which a channel identification code (referred to as a CI code) is set as an option. CI
The code is an identification code representing the channel type of the slot. When the slot is used as a functional channel such as SCCH, BCCH, PCH, etc., each unique identification code is C
When it is written in the I code and used as an option, the optional identification code is written in the CI code.

That is, if an optional identification code is written in the CI code, the user can freely use the slot. In the present embodiment, the CI code of the slot to be transmitted by the slave unit on the transmitting side is optional. And if the slot is filled with necessary information, it is possible to notify the mail mode and transmit transmission data such as voice mail and message. However, it goes without saying that if the transmission data of the calling handset is a voice message, it may be placed on the information channel I (TCH) (FIG. 13 (f)).

[0046]

Since the present invention is configured as described above, when a direct call is made between two or more sub-units, the caller must notify each other of his / her intention. You don't have to repeat and you can focus on other tasks.

[Brief description of the drawings]

FIG. 1 is a coding format diagram of a functional channel used in direct communication between slave units.

FIG. 2 is a conceptual diagram when a call between handset units is performed in a transceiver mode in the cordless telephone system according to the embodiment of the present invention.

FIG. 3 is a block diagram of a slave unit used in the cordless telephone system according to the embodiment of the present invention.

FIG. 4 is an outgoing / incoming call control sequence at the time of performing a call between slave units in the transceiver mode in the cordless telephone system according to the embodiment of the present invention.

FIG. 5 is an operation flowchart performed by the CPU on the calling side in a call between handset units in the transceiver mode.

FIG. 6 is an operation flowchart performed by a receiving-side CPU in a call between slave units in the transceiver mode.

FIG. 7 is a diagram showing a successful communication sequence of a call between four slave units in the transceiver mode in the cordless telephone system according to the embodiment of the present invention.

FIG. 8 is a diagram showing a failed communication sequence of a call between four slave units in the transceiver mode in the cordless telephone system according to the embodiment of the present invention.

FIG. 9 is an exemplary view showing a transmission destination list possessed by a calling handset in the cordless telephone system according to the embodiment of the present invention;

FIG. 10 is a diagram showing a FACCH message format (at the time of direct communication between slave units) conforming to RCR STD-28.

FIG. 11 is a diagram showing an SCCH message format (at the time of direct communication between slave units) conforming to RCR STD-28.

FIG. 12 is a diagram showing coding formats of various channels used when making a call via a base station.

FIG. 13 is a diagram showing coding formats of various channels used when making a call via a base station.

FIG. 14: FACCH / SACC based on RCR STD-28
The figure which showed the message format of H.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Antenna 2 ... Radio | wireless part 3 ... Modulation / demodulation part 4 ... Digital signal processing part 5 ... Audio processing part 6 ... Microphone 7 ... Speaker 8 ... Data processing part 9 ... Display device 10 CPU 11 Memory

Claims (3)

[Claims] 1. A cordless telephone system for performing a call between slave units without passing through a master unit, comprising a memory for storing data in the slave unit, an output unit for outputting data, and a control unit for controlling each of the units. The control means stores data to be notified to the other handset in the memory when making a direct call between the handset without passing through the master, and automatically transmits the data to the other handset at a predetermined time. A cordless telephone system characterized by the following. 2. In the cordless telephone system,
3. The communication system according to claim 1, wherein when the interface of the wireless section complies with the second generation cordless telephone system standard, the data notification is performed using an option area of a predetermined function channel. Cordless telephone system. 3. In the cordless telephone system,
When the interface of the wireless section complies with the second generation cordless telephone system standard, the notification of the data is:
3. The cordless telephone system according to claim 1, wherein the call is performed using a channel in which a channel identification code representing a type of each channel is set as an option.