JPH09261714A - Key telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently determine a speech channel by transmitting plural pieces of radio channel information which are usable on radio telephone terminal sides at the same time from the radio telephone terminal sides to radio base stations after a radio line is established. SOLUTION: For transmission from radio telephone terminals 110a and 110c, the terminals 110a and 110c send connection information signals including plural pieces of radio channel information which are usable in a system and have no mutual interference to radio base stations 109a and 109b through a main device 101. The radio base stations 109a and 109b once receiving the signals select usable radio channels out of plural radio channels and return the usable channel information to the radio telephone terminals 110a and 110c.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone device for accommodating a radio telephone in an extension line.

[0002]

2. Description of the Related Art Conventionally, the extension terminals in a key telephone device have been mainly those connected by wire as shown in FIG. 18, for example. Button telephone devices that use the device have appeared.

In this radio button telephone device, when a call or the like is performed between each radio telephone device and the main device, communication is temporarily established on the control channel on the radio line and the call channel to be used next is determined. , You have to switch to that call channel. In the wireless communication of the multi-channel access system, the frequency band to be used for the control channel and the communication channel is defined by the Radio Law as follows.

Radio base station (parent device) → radio telephone terminal (child device) 380.2125 to 381.3125 MHz Radio base station (parent device) ← radio telephone terminal (child device) 253.8625 to 254.9625 MHz 12.5 KHz There are 89 channels at intervals, 4 of which
6 channels (: 380.7500 /: 254.00
0) and 89 channels (: 381.3125 /: 25)
4.9625), in particular two channels are used as control channels.

Generally, the base station side detects an empty channel for the frequency band () of the radio wave transmitted by the radio telephone terminal, and the radio terminal side has an empty channel for the frequency band () of the radio wave transmitted by the radio base station. Each has a function of detecting a channel.

Therefore, as a method of determining the speech channel to be used, for example, the wireless base station detects an empty channel in the frequency band of the wireless base station and notifies the wireless telephone terminal of the empty channel information.

Next, if the designated wireless channel is vacant even within the frequency band, the wireless telephone terminal will use the designated wireless channel thereafter.

As described above, the speech channel to be used is determined by giving the initiative to one and using the detection functions of both.

[0009]

However, the radio wave environment during operation is, for example, introduction of a new radio telephone or various O
It is not always good due to the introduction of equipment that may become a noise source such as equipment A. Therefore, if the wireless channel specified by the wireless base station cannot be used,
That is, the wireless telephone device may not be able to detect an empty channel. In such a case, the radio telephone terminal performs a retry process such as waiting for channel designation information from the radio base station again. This is because the radio base station has the channel decision right.

Details of the conventional retry process will be briefly described with reference to FIGS. 16 and 17.

In the case of a call origination operation from the radio telephone terminal of FIG. 16, a connection notification signal (M801) is transmitted from the radio telephone terminal C to the radio base station C. Next, the radio base station C
Transmits to the wireless telephone terminal C a connection response signal (M802) including information on usable channels (used channel information 1) among the wireless channels managed by the own station. The radio telephone terminal C confirms the use of the radio channel,
If it cannot be used, an operation (in this case, a non-processing operation) indicating retransmission is performed.

When the response is not returned within the fixed time, the wireless base station C sends a connection notification signal (M901) including the available wireless channel information (used channel information 2) different from the previously transmitted wireless channel. To send.
Similarly, the radio telephone terminal C confirms the use of the designated radio channel, and if available, returns a channel movement notification signal (M803) to the radio base station C.

On the other hand, in the case of an incoming call, in FIG. 17, the radio base station A has a connection request signal (use channel information 1) including information of usable channels (use channel information 1) among the radio channels managed by itself. M1305) to the wireless telephone terminal A. The radio telephone terminal A confirms the use of the radio channel, and when the use is impossible, performs an operation (non-processing operation here) indicating retransmission.

When the response is not returned within the fixed time, the wireless base station A transmits a connection request signal (M1401) including usable wireless channel information (used channel information 2) different from the previously transmitted wireless channel. To send. Similarly, the radio telephone terminal A confirms the use of the designated radio channel, and if available, returns a channel movement notification signal (M1402) to the radio base station A. The radio base station A confirms the use channel decision, and the radio telephone terminal A
A channel movement confirmation signal (M1403).

When the radio channel designated by the radio base station side cannot be used on the radio telephone terminal side as described above, retry processing is performed a plurality of times until the call channel used on the radio line is determined. Occurs. This is not a problem in a small number of systems such as 1 or 2 in which the extension accommodates the radiotelephone devices, but the extension telephones may be 4 to 8 or more button telephone devices that accommodate the radiotelephone devices. In such a system, the determination of the call channel used by the entire key telephone device is delayed (response timeout from the wireless telephone terminal, etc.), when making a call (see FIG. 16: M901), and when receiving a call (see FIG. 17: M1401). From the user's point of view, the processing (operation) of (1) is significantly delayed, which is intolerable.

An object of the present invention is to provide a key telephone device which can efficiently determine a call channel.

[0017]

According to the present invention, a radiotelephone terminal has means for transmitting information indicating a plurality of radio channels to a radio base station, and the radio base station informs the plurality of radio channels. It is characterized by having a means for selecting an arbitrary wireless channel based on the information when receiving the. Further, the radio base station has means for transmitting information indicating a plurality of radio channels to the radio telephone terminal, and the radio telephone terminal, when receiving the information indicating the plurality of radio channels, based on the information. Is characterized by having means for selecting an arbitrary wireless channel.

In the above configuration, at the time of calling from the wireless telephone terminal, a connection notification signal (including a plurality of wireless channel information without mutual interference that can be used in the system) is transmitted to the wireless base station, and the signal is wirelessly transmitted. Upon reception by the base station, an available wireless channel is selected from a plurality of wireless channels and the selected used channel information is returned to the wireless telephone terminal.

When a call arrives at the radio telephone terminal, a connection request signal (including a plurality of radio channel information without mutual interference that can be used in the system) is returned from the radio base station to the radio telephone terminal. Upon reception of the signal, selects a usable wireless channel from a plurality of wireless channels and returns the selected used channel information to the wireless base station.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a block diagram showing the configuration of a key telephone device according to an embodiment of the present invention.

The main unit 101 of this button telephone unit has a telephone line 102 such as a general subscriber line or a private branch exchange, a station line interface 103, an extension-dedicated telephone interface 105 for accommodating an extension 104, and an external line and an extension line. It has a communication path switch 106 for exchanging information, a control unit 107 for controlling the entire main unit 101, and a storage area unit 108 for storing various information.

Then, the extension 104 of this key telephone device
To the wireless base stations 109a and 109b, respectively, and to the wireless base stations 109a and 109b, wireless telephone terminals (mobile stations) 110a and 110b are connected.

In the conventional example shown in FIG. 18, a wired telephone 111 is connected instead of the wireless telephones (109, 110) shown in FIG. 1, and the other components are the same as in FIG. Therefore, the same reference numerals are given and description thereof will be omitted.

FIG. 2 is a block diagram showing the configuration of the radio base station 109.

The radio base station 109 has a line interface unit 201 which accommodates the extension 104 of the key telephone unit.
A voice processing circuit 202 for converting a wired signal and a wireless signal, a wireless circuit unit 203 for transmitting and receiving a wireless signal, and a control unit 2 for controlling the wireless base station 109.
04, a modem 205 that performs modulation and demodulation of control signals, an R0M 206 that stores various programs, a RAM 207 that stores various control information and the like, and an antenna 208 that transmits and receives wireless signals.

FIG. 3 is a block diagram showing the configuration of the radio telephone terminal 110.

The radio telephone terminal 110 has a receiving section 301 for receiving a call and a transmitting section 302 for transmitting a call.
A voice processing circuit 303 for converting a radio signal and a listening signal, a radio circuit section 304, a control section 305 for controlling the radio telephone terminal 110, and a modem 306 for modulating / demodulating the control signal. And R storing various programs
An antenna 308 that transmits and receives a wireless signal to and from the OM 307
A speaker button 309 used for starting a call, a liquid crystal display unit 310 for displaying dial input, and the telephone line 1.
An outside line indicator (LED) 311 for displaying the 02 status,
A function key 312 used when using various functions peculiar to the button telephone device, a dial information input unit 313, a RAM 314 that stores various control information, a speaker 315 for a loud call, and a microphone 316. , Speaker LED 317.

Next, a first embodiment of the present invention will be described. 1 to 3 are common to each of the following embodiments.

FIG. 4 shows the main unit 1 in this first embodiment.
FIG. 5 is a flowchart showing the processing of No. 01, and FIG. 5 is a flowchart showing the processing of the radio base station 109 in this first embodiment.

6 and 7 are flowcharts showing the processing of the radio telephone terminal 110 in this first embodiment, and FIG. 8 is a sequence chart showing the exchange of signals in this first embodiment. Further, FIG.
(A) is an explanatory view showing a format of radio channel information used in the first embodiment.

First, when the radio telephone terminal 110 makes a call request (S601), the radio telephone terminal 110 sends RA
The wireless channel management table stored in M314 is referred to, and a channel available in the system is searched (S602). For the convenience of description, the condition of the wireless channel searched here is set to any 10 wireless channels in the usable frequency band.

Then, as a result of the search, if there is no used channel (S603: NO), idle transition processing is performed on the wireless telephone terminal 110 during the calling operation (S6).
04), transition to the idle state.

If there is a used channel as a result of the search (S603: YES), the wireless telephone terminal 110
A wireless line connection notification signal (including used channel information as shown in FIG. 15A) (M801) is transmitted to the wireless base station 10
9 (S605).

Next, the call origination request is analyzed (S60).
6). If the call request is made by pressing the outside line button (S
606: YES), the outside line L corresponding to the outside line button n
The outside line LED corresponding to the outside line button n in the ED 311 is transmitted and blinks (for example, green: 0.5 second cycle) (S60).
7). Next, the speaker LED 317 is turned on (S61
1), the audio circuit 303 inside the wireless telephone terminal 110 is connected to the speaker 315 and the microphone 316, and the volume is adjusted (S612).

If the call request is not the outside line button n (S606: NO), it is checked whether the call request is off-hook (S608).

When the outgoing call request is off-hook (S
608: NO), the speaker LED 317 is turned off (S
609), the voice circuit 303 inside the wireless telephone terminal 110 is connected to the receiving section 301 and the transmitting section 302, and the volume is adjusted (S610).

When the call request is made by pressing the speaker button (S608: NO), the processing of S611 and S612 is performed as in the case of pressing the outside line button n. After the above transmission processing is completed, the display on the liquid crystal display unit 310 is cleared (S61).
3).

The connection notification signal (M801) is received (S
The radio base station 109 that has performed 501) is the radio telephone terminal 110.
The state of each of the plurality of call channels designated by is checked (S502), and if all the wireless channels are unavailable (S503: NO), there is no available call channel for the wireless telephone terminal 110. A message such as a line disconnect call including the information to that effect is transmitted, disconnection processing is performed (S504), and the state transits to the idle state.

As a result of the check, if there is a usable channel (S503: YES), the radio base station 109
Is a connection response signal (including used channel information) (M80
2) is transmitted to the wireless telephone terminal 110 (S505), and the response timer is activated (S506).

When the response timer has timed out (S507: YES), the radio base station 109 sends a message such as a line disconnection request including information indicating that there is no usable communication channel in the radio telephone terminal 110. Is transmitted, disconnection processing is performed (S504), and the state transits to the idle state.

The connection response signal (M802) is received (S
701: YES), the radio telephone terminal 110 again checks the state of the call channel designated by the radio base station 109,
If the wireless channel is unavailable (S702: NO),
A message such as a line disconnection notification containing information indicating that there is no usable communication channel is transmitted to the wireless base station 109, disconnection processing is performed (S710), and the state transits to the idle state.

When it can be used (S702: YE
S), switching the used frequency from the radio control channel to the radio communication channel (S703), and transmitting a channel movement notification signal (including information of a radio channel to be used from among a plurality) (M803) to the radio base station 109. Yes (S7
04). After that, signals are transmitted and received on the call channel.

On the other hand, in the radio base station 109, before the response timeout (S507: NO), the radio telephone terminal 11
When the channel movement notification signal (M803) cannot be received from 0 (S508: NO), the processing from S507 onward is repeated.

Before response timeout (S507: NO)
From the wireless telephone terminal 110 to the channel movement notification signal (M8
03) is received (S508: YES), information of usable channels is stored in the RAM 207 based on the information included in the signal (S509). Then, the channel movement response signal (M804) is transmitted to the radio telephone terminal 110 (S510). Further, it transmits a connection notification (M805) (including information on the call channel to be used) to the main device 101 (S511).

After that, the radio base station 109 enters the communication state on the radio line, and the radio telephone terminal 110 receiving the channel movement response signal also enters the communication state on the radio line like the radio base station 109.

On the other hand, the main device 10 that has received the connection notification (including the used channel information) (M805) (S401).
1 is all radio base stations 109 accommodated in the system
The used channel information (M806, M807) is transmitted to (S402, S403).

Further, the channel movement response signal is received (S7
05) The wireless telephone terminal 110 that has done the
08) is transmitted to the wireless base station 109 (S706). The radio base station 10 that has received this outside line transmission signal (M808)
9 transmits an outside line call (M809) to the main device 101.

When the main unit 101 receives an outside line call (M809) (S404: YES), the radio base station 109
To the outside line LED state (M810) to (S40
5), and then transmits a voice connection request (M812) (S4)
06). Subsequently, an empty line on the line 102 is captured (S407). In addition, the station line interface 10
3 and telephone interface 105 for extension only
Connection is made at 06 (S408).

Upon receiving the outside line LED state (M810) and the voice connection request (M812), the wireless base station 109 sends the outside line LED state signal (M81) to the wireless telephone terminal 110.
1) and a voice connection request signal (M813) are transmitted.

When the radio telephone terminal 110 receives the outside line LED status signal (M811) (S707), the outside line L
It controls the LED of the ED 311. When the voice connection request signal (M813) is received (S708), the voice processing circuit 303 inside the radio telephone terminal 110 connects the radio circuit unit 304, the speaker 315, and the microphone 316 (S).
709).

At the speaker 315, a dial tone (DT) (M814) from a station or a private branch exchange is heard as the main unit 101 captures the telephone line 102.
After that, the main apparatus 101 transitions to the outside line calling state.

Next, a second embodiment of the present invention will be described.

FIG. 9 shows the main unit 1 in this second embodiment.
10 is a flowchart showing the processing of No. 01, and FIG. 10 is a flowchart showing the processing of the radio base station 109 in this second embodiment.

FIG. 11 is a flow chart showing the processing of the radio telephone terminal 110 in the second embodiment, and FIGS. 12 and 13 are sequence charts showing the exchange of signals in the second embodiment. Further, FIG. 15B is an explanatory diagram showing the format of the wireless channel information used in this second embodiment.

For the sake of explanation, it is assumed that the radio telephone terminal 110C is in an outside line call (M1301, M1302).

External line incoming from the telephone line 102 (M130
3) is detected (S1001), the main unit 101 analyzes the data stored in the storage area unit 108, and the wireless base station 109 (all in the system) to which the wireless telephone terminal 110 capable of receiving an outside line is connected. Connection request to (M130
4, M1314) is transmitted (S1002, S100
3).

Connection request (M1304, M1314)
The wireless base station 109 that has received the
The wireless channel management table stored in 207 is referred to, and a channel available in the system is searched (S1102). For the convenience of description, the condition of the wireless channel searched here is set to any 10 wireless channels in the usable frequency band.

As a result of the search, when there is no usable channel (S1103: NO), a message such as a connection failure including information indicating that there is no usable communication channel is transmitted to the main unit 101. Then, disconnection processing is performed (S1104), and the state transits to the idle state.

Further, as a result of the search, when there is a used channel (S1103: YES), a connection request signal (FIG. 15) is obtained.
The used channel information as shown in (b) includes a format managed in bit configuration) (M1305, M131
5) is transmitted to the wireless telephone terminal 110 (S1105), and the response timer is activated (S1106).

When the response timer times out (S1107: YES), the radio base station 109 displays a message such as a connection failure including information indicating that there is no usable communication channel for the main apparatus 101. Send
A disconnection process is performed (S1104), and a transition is made to the idle state.

The connection request signal (M1305, M131)
The wireless telephone terminal 110 that has received 5) (S1201)
When the states of a plurality of call channels designated by the radio base station 109 are checked and all the radio channels are unusable (S1
202: NO), a message such as a connection failure including information indicating that there is no usable communication channel is transmitted to the wireless base station 109, and disconnection processing is performed (S120).
9), transition to idle state.

When it can be used (S1202: YE
S), a connection confirmation signal to the wireless base station 109 (including information on a wireless channel to be used from among the plurality) (M130
6, M1316) is transmitted (S1203). continue,
The frequency used is switched to the wireless control channel (S120
4).

On the other hand, in the wireless base station 109, a connection confirmation signal (M1306, M131) is sent from the wireless telephone terminal 110 before the response timer times out (S1107: NO).
6) cannot be received (S1108: NO), S
The processing from 1107 onward is repeated.

Before the response timer times out (S
1107: NO) when the connection confirmation signal (M1306, M1316) is received from the wireless telephone terminal 110 (S11)
08: YES), based on the information included in the signal, information of usable channels is stored in the RAM 207 (S1109), and the channel movement notification signal (M1307, M1317) is transmitted to the wireless telephone terminal 110. (S11
10).

The channel movement notification signal (M1307,
Upon receiving M1317) (S1205: YES), the radiotelephone terminal 110 transmits a channel movement confirmation signal (M1308) to the radio base station 109 (S1206).
Thereafter, transmission and reception of signals are performed on the communication channel.

The channel movement confirmation signal (M1308,
If M1318) is received (S1111: YES), the wireless base station 109 confirms the connection with the main device 101 (M
1309, M1319) (including information about the call channel to be used) is transmitted (S1112). After that, the wireless base station 109 and the wireless telephone terminal 110 are in a communication state on the wireless line.

On the other hand, a connection confirmation (including used channel information) (M1309, M1319) is received (S1004).
The main device 101 that has used the channel information (M131) for all the radio base stations 109 accommodated in the system.
0, M1311, M1320, M1321) is transmitted (S1005 to S1006).

Next, an external line incoming call (M1312, M1322) is transmitted to the wireless base station 109 to which the wireless telephone terminal 110 capable of receiving an external line whose wireless line establishment has been confirmed is connected (S1007 to S1009).

The radio base station 109 which has received the outside line incoming call
To the wireless telephone terminal 110, an external line incoming signal (M1312,
M1322) is transmitted. The radio telephone terminal 110 receiving the outside line incoming signal controls the corresponding outside line LED 311 (rapid blinking in red) (S1208). Thereafter, the wireless telephone terminal 110 transits to the outside line incoming call state.

Next, a third embodiment of the present invention will be described.

FIG. 14 is a sequence chart showing the exchange of signals in the third embodiment.

In the second embodiment, as shown in FIGS. 12 and 13, after the main apparatus 101 receives the connection confirmation from the wireless base station 109 as the transmission timing of the used channel information, each wireless base station 109 receives it. Although the use channel information (M1310, M1311) was transmitted as a single message, in the example shown in FIG. 14, the use channel information is transmitted to the next one after the wireless line for the wireless telephone terminal 110 accommodated in the system is established. This is included in the connection request (M1501) transmitted to the wireless telephone terminal 110. Even in this case, the same effect as that of the above-described embodiment can be obtained.

The present invention is not limited to the above embodiments, and the following modifications are possible.

For example, the radio base station described in each of the above embodiments may be the main device. Also, in each of the above embodiments, the conditions of the wireless channel to be searched are, for convenience of description,
Although any 10 radio channels in the available frequency band have been used, this may be any other particular radio channel used in the system. Further, a wireless channel that does not have mutual interference in consideration of intermodulation in advance may be used.

In each of the above embodiments, the plurality of wireless channels, which is the information transmitted from the wireless base station 109, is the group information of the usable wireless channels. This is because the wireless channels are unique in the system. If it is determined to be, that is, if it is fixedly used, group information of unusable wireless channels may be transmitted.

[0076]

As described above, according to the present invention,
Each wireless telephone terminal independently manages a plurality of specified wireless channel information used in the system, and after the wireless line is established, the wireless telephone terminal side to the wireless base station can use the wireless telephone terminal side By transmitting a plurality of channel information at the same time, it is possible to prevent the wireless base station side from performing a process of selecting and determining a usable wireless channel a plurality of times.

Similarly, each wireless base station independently manages the above-mentioned wireless channel information, and after the wireless line is established, the wireless base station side sends to the wireless telephone terminal the wireless channel information available on the wireless base station side. By sending several at the same time,
On the side of the wireless telephone terminal, it is possible to prevent the process of selecting and determining an available wireless channel from occurring a plurality of times.

Further, when all the wireless channels are unavailable, error processing such as a line connection failure can be promptly executed.

As described above, according to the present invention, there are four to eight extension lines.
In a system such as a button telephone device accommodating one or more wireless telephone devices, the user's position that the processing (operation) at the time of incoming / outgoing call is significantly delayed due to the delay in determining the call channel used by the entire button telephone device. It is possible to remarkably improve the unbearable inconvenience.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a key telephone device according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a radio base station of the above embodiment.

FIG. 3 is a block diagram showing a configuration of a wireless telephone terminal of the above embodiment.

FIG. 4 is a flowchart showing the processing of the main device in the first embodiment of the present invention.

FIG. 5 is a flowchart showing the processing of the wireless base station in the first embodiment.

FIG. 6 is a flowchart showing processing of the wireless telephone terminal in the first embodiment.

FIG. 7 is a flowchart showing the processing of the wireless telephone terminal in the first embodiment.

FIG. 8 is a sequence chart showing exchange of signals in the first embodiment.

FIG. 9 is a flowchart showing the processing of the main device in the second embodiment of the present invention.

FIG. 10 is a flowchart showing the processing of the wireless base station in the second embodiment.

FIG. 11 is a flowchart showing the processing of the wireless telephone terminal in the second embodiment.

FIG. 12 is a sequence chart showing exchange of signals in the second embodiment.

FIG. 13 is a sequence chart showing the exchange of signals in the second embodiment.

FIG. 14 is a sequence chart showing exchange of signals in the third embodiment of the present invention.

FIG. 15 is an explanatory diagram showing a format of radio channel information used in each of the embodiments.

FIG. 16 is a sequence chart showing the exchange of signals in the first conventional example.

FIG. 17 is a sequence chart showing the exchange of signals in the second conventional example.

FIG. 18 is a block diagram showing a configuration example of a conventional key telephone device.

[Explanation of symbols]

 101 ... Main device, 102 ... Telephone line, 103 ... Station line interface, 104 ... Extension, 105 ... Extension dedicated telephone interface, 106 ... Call path switch, 107 ... Control section, 108 ... Storage area section, 109a, 109b ... Radio base Stations, 110a, 110b ... Wireless telephone terminals.

Claims (8)

[Claims] 1. A button telephone device for connecting a wireless telephone terminal and a wireless base station by a wireless line and transmitting and receiving information via the wireless line, wherein the wireless telephone terminal transmits information indicating a plurality of wireless channels. A means for transmitting to the radio base station, wherein the radio base station, when receiving the information indicating the plurality of radio channels, has means for selecting an arbitrary radio channel based on the information. Characteristic button telephone device. 2. A button telephone device that connects a radiotelephone terminal and a radio base station via a radio line, and transmits and receives information via the radio line, wherein the radio base station transmits information indicating a plurality of radio channels. When the wireless telephone terminal receives information indicating the plurality of wireless channels, the wireless telephone terminal has means for selecting an arbitrary wireless channel based on the information. Characteristic button telephone device. 3. The button telephone device according to claim 1, wherein the plurality of wireless channels are specific wireless channels used in the system. 4. The button telephone apparatus according to claim 3, wherein the wireless channel is a wireless channel that does not have mutual interference in consideration of intermodulation in advance. 5. The button telephone device according to claim 4, wherein the wireless channel indicated in the information indicating the plurality of wireless channels is a wireless channel that can be used when a wireless line is established. 6. The button telephone device according to claim 4, wherein the wireless channel indicated in the information indicating the plurality of wireless channels is a wireless channel that cannot be used when a wireless line is established. 7. The button telephone device according to claim 1, wherein the radio base station is housed in an extension of a main device of the button telephone device. 8. The button telephone device according to claim 1, wherein the wireless base station is a main device of the button telephone device.