JP3661088B2 - Cordless phone system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cordless telephone system, and more specifically, to a cordless telephone system including a parent device equipped with a plurality of wireless circuits and its child devices.
[0002]
[Prior art]
FIG. 8 is a processing flow diagram when a control channel is selected in the conventional cordless telephone system. In FIG. 8, when processing is started (step 801), it is first confirmed whether or not 46ch is usable (step 803). As a result of the confirmation, if it can be used, the calling process is performed using 46ch as a control channel (step 805), the process proceeds to the call channel (step 807), and the process is terminated (step 817). On the other hand, if it is determined in step 803 that 46 ch is not usable, it is checked whether 89 ch is usable (step 813). As a result of the confirmation, if it can be used, the calling process is performed using 89ch as a control channel (step 809), the process shifts to the call channel (step 811), and the process ends (step 817). If it is determined in step 813 that 89ch cannot be used, the link is failed (step 815), and the process is terminated (step 817). In the conventional cordless telephone system, the extension function has been established by the above procedure.
[0003]
[Problems to be solved by the invention]
However, in the conventional processing procedure, the link processing always takes time in an environment where there is an interference wave in the main control channel (46ch). In addition, even when the control channel is affected by an interference wave, it cannot be predicted in advance. Further, when link processing with the called side slave unit is performed using the sub control channel (89ch), spurious may occur in the band to be used depending on the communication channel used by the calling side slave unit.
In view of the above problems, an object of the present invention is to provide a cordless telephone system that shortens the link processing time and does not generate spurious in the band.
[0004]
[Means for Solving the Problems]
In order to solve the above-described problem, a cordless telephone system according to the present invention includes a master unit on which a first radio circuit and a second radio circuit that are used with a predetermined channel interval are mounted, or a cordless telephone system constituted by the first and second slave units using the second radio circuit to establish the external function and the extension function, the handset between an instruction from the first handset when performing extension call, a first handset and base unit, and means for confirming the speech channel already used in the first radio circuit, control with the confirmed call channel with a predetermined channel spacing means for selecting a channel and uses the selected control channel, the master unit, characterized by comprising a means for performing the extension call in the second radio circuit to a second handset.
[0005]
Furthermore, in the cordless telephone system, the master unit and each slave unit are provided with means for holding a success history in which the success / failure of link processing and the control channel used at that time are recorded. When making a call, the master unit confirms a call channel used in the first radio circuit, a means for selecting a control channel having the predetermined call interval and the confirmed call channel, and search thereof As a result, when there are a plurality of corresponding control channels, a means for determining a control channel to be used based on the success history, and the second wireless circuit using the determined control channel from the first slave unit It is preferable to comprise means for making an extension call to the second slave unit.
[0006]
Furthermore, in the cordless telephone system, when an extension call is made from a slave unit to another slave unit or a master unit, the first slave unit uses a control channel based on a success history held in the own unit. It is preferable to provide a means for determining.
Further, the cordless telephone system includes means for determining a control channel to be used based on a success history held by the master when the extension call is made from the master to the slave. Is preferred.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Next, an embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a block diagram showing a parent device as an embodiment according to the present invention, FIG. 2 is a block diagram showing a child device as an embodiment according to the present invention, and FIG. 3 is a data structure diagram of a success history described later. is there. FIGS. 4 and 5 are control channel selection processing flowcharts, and FIGS. 6 and 7 are sequence diagrams for explaining transmission / reception of signals between the master unit and the slave units. In the sequence diagrams of FIGS. 6 and 7, control channel transmission is indicated by a wavy line, and speech channel transmission is indicated by a solid line or a chain line.
[0008]
A master device 100 shown in FIG. 1 has a CPU 101 that controls the entire master device, and the CPU 101 has 113 and 115 as internal memories. A success history to be described later is stored in these internal memories. Further, the CPU 101 is connected to the FLASH memory 103 to exchange various data. Further connected to the CPU 101 are a key 105, an LCD (liquid crystal display) 107, radio circuits 111 and 112, a speech path control circuit 115, and a hook switch 121. Here, the key 105 includes an answering key, a reproduction key, a hands-free key, a registration key, an * key, a numeric keypad, and the like, and displays various types of information on the LCD 107. The FLASH memory 103 stores various information such as the received caller ID and has a memory function as a telephone directory. Further, a program in which the operation procedure of the main unit 100 is written is installed in the FLASH memory 103, and the CPU 101 controls the entire main unit according to this program. Reference numeral 117 denotes a line interface circuit which performs processing such as polarity reversal and line state detection in accordance with a general public line (telephone line 119 in FIG. 1). The speech path control circuit 115 connected to the line interface circuit 117 incorporates a transmission / reception amplification circuit, a constant current circuit, and the like, and performs various processes according to control signals from the CPU 101. Also, wireless circuits 111 and 112 are connected to the communication path control circuit 115. For example, when a handset 200 that is making an external line call calls another handset, a call channel for an external line call is wirelessly transmitted. In the circuit 111, a control channel for calling other slave units is used by being managed by the wireless circuit 112, for example. In the present embodiment, it is assumed that the channel interval between the radio circuits 111 and 112 and both radio circuits is 20 channels or more.
[0009]
The radio circuit 111 modulates and demodulates the electrical signal sent from the telephone line 119 via the line interface circuit 117 and the speech path control circuit 115 and transmits it from the antenna 109 to the slave unit, and conversely, the electrical signal received from the slave unit. Modulate and demodulate and send the signal to the telephone line 119 via the speech path control circuit 115 and the line interface circuit 117. As described above, when a normal external line call is performed using one slave unit, only the radio circuit 111 is used, and the radio circuit 112 enters a standby state. That is, the radio circuit 112 is used only when an extension call is made using two slave units. For example, when the handset 210 and handset 220 make an extension call, an electric signal from the handset 210 received by the antenna 109 is modulated / demodulated by the radio circuit 111 and modulated by the radio circuit 112 via the call path control circuit 115. After that, the data is transmitted to the child device 220. Similarly, an electric signal from the slave unit 220 received by the antenna 110 is modulated / demodulated by the radio circuit 112, modulated by the radio circuit 111 via the speech path control circuit 115, and then transmitted to the slave unit 210.
[0010]
A slave unit 200 shown in FIG. 2 has a CPU 231 that controls the entire slave unit, and this CPU 231 has a RAM 241 that is an internal memory. A success history described later is stored in the RAM 241. Further, an RF module 233 and a comber IC 234 are connected to perform wireless communication with the parent device 100, and an antenna 232 is connected to the RF module 233. In addition, the voice output unit of the comban IC 234 is connected to the speaker 236 via the amplifier 235, and the microphone 237 is connected to the voice input unit. Similarly to the parent device 100, a key matrix 238 for inputting information, an LCD display unit 239 for displaying information, and a ROM 240 for storing various information are connected to the CPU 231. In this ROM 240, a program in which the operation procedure of the slave unit is written is installed, and the CPU 231 controls the entire slave unit according to this program. Further, a control channel selection processing program according to the present invention, which will be described later, is also stored in the ROM 240.
[0011]
FIG. 3 is a data configuration diagram of the success history stored in the RAM 129 of the parent device 100 and the RAM 241 of the child device 200, and the success / failure of the link processing at the time of extension call and the control used at that time. Channels are stored in association with each other. In FIG. 3, the column 301 indicates the previous / successful link processing, the column 302 indicates the previous / next time, the column 303 indicates the previous three times, and the column 304 indicates the previous / successful / unsuccessful link processing. Further, line 310 indicates success / failure of the control channel of 46 ch and line 320 of 89 ch.
FIG. 4 is a processing flow chart when a control channel is selected based on the success history shown in FIG. 3, and FIG. 5 is a control based on the success history shown in FIG. 3 and a call channel already used. It is a processing flow figure at the time of selecting a channel. In this description, the process of FIG. 4 is referred to as a control channel selection process A, and the process of FIG.
[0012]
FIG. 6 is a sequence diagram when an extension call is made between the slave units. In step 601 of FIG. 6, when the slave unit 210 presses the [hold / extension] button, the control channel selection process A is executed (step 603). Subsequent to step 603, a hold / extension signal is transmitted from the slave unit 210 to the master unit 100 using the control channel set in the control channel selection process A. Receiving the same signal, base unit 100 sends a return ACK + Sch designation signal to slave unit 210. At this time, the ACK + Sch designation signal is also transmitted on the control channel selected in the control channel selection process A. Subsequently, base unit 100 sends an extension standby signal to handset 210 using the call channel. Receiving the same signal, handset 210 sends a return ACK signal. The slave unit 210 that has transmitted the ACK signal to the master unit 100 enters an extension standby state (step 605).
[0013]
When the [2] button is pressed in step 605, the [2] key signal is sent from the slave unit 210 to the master unit 100. Receiving the same signal, base unit 100 sends an ACK + slave unit extension standby signal to slave unit 210. The slave unit 210 that has received the signal shifts to a standby state between the slave units (step 607).
Subsequently, a Sch designation signal is transmitted from the parent device 100 to the called child device 220 using the control channel selected in the control channel selection process B (step 606). Receiving the same signal, handset 220 sends a return ACK signal to base unit 100. Subsequently, handset 220 shifts to an extension incoming signal receivable state (step 609).
[0014]
Subsequently, base unit 100 sends an extension incoming signal to handset 220. The call channel (chain line) used at this time is different from the call channel (solid line) used between the parent device 100 and the child device 210. Receiving the same signal, handset 220 sends a return ACK signal. Receiving the ACK signal from the slave unit 220, the master unit 100 sends an extension transmission signal to the slave unit 210. Receiving the same signal, slave unit 210 sends a return ACK signal to master unit 100. The slave unit 210 shifts to the extension transmission state simultaneously with the transmission of the ACK signal (step 611).
[0015]
In this state, when handset 220 is hooked off (step 613), handset 220 sends an off-hook signal to base unit 100. Receiving the same signal, master device 100 sends back ACK + extension call signal to slave device 220. Subsequently, base unit 100 sends an extension call signal to handset 210. Receiving the same signal, slave unit 210 sends a return ACK signal to master unit 100. After the transmission and reception of signals as described above, the extension call between the slave unit 210 and the slave unit 220 is started (step 615). The control channel selection process A (step 603) in FIG. 6 will be described with reference back to FIG. 4, and the control channel selection process B (step 606) will be described in detail with reference to FIG.
[0016]
In FIG. 4, when the control channel selection process A is started (step 401), the success history is referred to (step 403). Referring to the success history (FIG. 3), it can be seen that the result of the success / failure (column 301) of the previous link process is 46ch success and 89ch failure. Accordingly, in step 405, it is confirmed whether or not the control channel (46ch) at the previous successful time is usable. As a result of the confirmation, if it is usable, 46ch is set as a control channel (step 407), and the process is terminated (step 415).
[0017]
On the other hand, if the previous successful control channel (46ch) is not usable in step 405, the process proceeds to step 409 to check whether another control channel (89ch) is available. As a result of the confirmation, if 89ch is usable, the process proceeds to step 407, where the 89 channel is set as the control channel and the process is terminated (step 415). On the other hand, if 89 channels cannot be used in step 409, the processing is terminated as a link failure (step 413) (step 415).
[0018]
Next, the details of the control channel selection process B (step 606) in FIG. 6 will be described with reference back to FIG. When the control channel selection process B is started (step 501), the parent device 100 confirms the communication channel (solid line in FIG. 6) that is already used between the own device and the child device 210 (step 503). The cordless telephone system used in this embodiment is based on the premise that 1ch to 26ch and 66ch to 88ch are used as communication channel bands, and the channel interval between the radio circuit 111 and the radio circuit 112 is separated by 20 channels or more. Therefore, if the communication channel already used (solid line in FIG. 6) is 70 ch to 88 ch, the control channel is set to 46 ch (step 505). Subsequently, it is confirmed whether or not 46ch can be used (step 515). As a result of the confirmation, if it cannot be used, it is determined that the link has failed (step 519), and the processing is terminated (step 525). If it is determined in step 515 that 46ch can be used, 46ch is set as a control channel (step 521), and the process ends (step 525).
[0019]
Returning to step 503, if the communication channel already used is 1 to 26 ch or 66 to 69 ch, both 46 ch and 89 ch are candidates for the control channel, so the success history (FIG. 3) is referred to (step 3). 507). Then, it is confirmed whether or not the control channel (46ch) at the previous success is usable (step 509). As a result of the confirmation, if it is usable, 46ch is set as the control channel (step 511), and the process is terminated (step 525).
As a result of step 509, when 46ch is not usable, it is confirmed whether another control channel (89ch) is usable (step 513). As a result of the confirmation, if it is usable, 89ch is set as the control channel (step 511), and the processing is ended (step 525). If 89ch cannot be used, it is determined that the link has failed (step 519), and the processing is terminated (step 525).
[0020]
Next, referring to FIG. 7, a sequence when the slave unit 210 that is performing an outside call relays to another slave unit 220 will be described. In step 701, when handset 210 that is making an external line call presses the [hold / extension] button (step 703), a hold / extension signal is sent from handset 210 to base unit 100. Receiving the same signal, master device 100 sends an ACK + external line hold signal to slave device 210. The handset 210 that has received the signal shifts to an outside line hold state (step 705). Subsequently, a [2] key signal is transmitted from the slave unit 210 to the master unit 100. Receiving the same signal, master unit 100 sends an ACK + inter-unit extension standby signal to loopback slave unit 210. The handset 210 that has received the signal shifts to a handset extension standby state (step 707).
[0021]
Subsequently, base unit 100 executes control channel selection process B (step 709). When the control channel selection process B ends, a Sch designation signal is transmitted from the parent device 100 to the child device 220 using the control channel set by the same process. Receiving the same signal, handset 220 sends a return ACK signal to base unit 100. Subsequently, an SCH movement confirmation signal is transmitted from the parent device 100 to the child device 220. Note that the call channel (chain line) used at this time is different from the call channel (solid line) used between the parent device 100 and the child device 210. Receiving the same signal, slave unit 220 sends a return ACK signal to master unit 100. Subsequently, an extension hold transmission signal is sent from the parent device 100 to the child device 210. Receiving the same signal, slave unit 210 sends a return ACK signal to master unit 100. On the other hand, handset 210 rings the extension ringer simultaneously with the transmission of the ACK signal (step 711).
[0022]
Receiving the ACK signal from the slave unit 210, the master unit 100 sends a hold extension incoming signal to the slave unit 220. Receiving the same signal, handset 220 sends a return ACK signal. Further, the slave unit 220 rings the extension ringer simultaneously with the transmission of the ACK signal (step 713). The slave unit 220 that is hooked off in response to the ringing of the extension ringer (step 715) receives the inter-hold extension unit call signal sent from the master unit 100. Thereafter, the extension call is started between the slave unit 210 and the slave unit 220 (step 717). When the extension call in step 717 is started, a hold extension transmission signal is sent from the parent device 100 to the child device 210. Receiving the same signal, slave unit 210 sends a return ACK signal to master unit 100. Subsequently, when handset 210 is hooked on (step 719), a hook-on signal is sent from handset 210 to base unit 100. Receiving the same signal, master device 100 sends a return ACK + link-off signal to slave device 210. Subsequently, base unit 100 sends an external line call disable signal to handset 220. The slave unit 220 that has received the signal transmits an ACK signal to the loopback master unit 100 and then starts an external line call (step 721). The detailed description of the control channel selection process B in FIG. 7 is the same as that of the control channel selection process B in FIG.
[0023]
As described above, according to the present invention, since the control channel is set based on the success / failure of the past link processing, it is possible to prevent the influence of the jamming wave in advance and to shorten the link processing time. is there. Further, since the channel interval used in the radio circuit mounted on the base unit is kept at a certain value or more, there is an advantage that no spurious is generated in the band.
As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment described using FIGS. 1-7, For example, the number of used control channels and each frequency are changed suitably. It is clear that this is possible.
[0024]
【The invention's effect】
Thus, according to the present invention, it is possible to provide a cordless telephone system that shortens the link processing time and does not generate spurious in the band.
[Brief description of the drawings]
FIG. 1 is a block diagram showing a master unit according to an embodiment of the present invention.
FIG. 2 is a block diagram showing a slave unit according to the embodiment of the present invention.
FIG. 3 is a data configuration diagram of a success history according to the embodiment of this invention.
FIG. 4 is a process flow diagram of control channel selection according to the present invention.
FIG. 5 is a process flow diagram of control channel selection according to the present invention.
FIG. 6 is a sequence diagram when an extension call is made between slave units.
FIG. 7 is a sequence diagram when performing outside line intermediation with another slave unit.
FIG. 8 is a process flow diagram of control channel selection in a conventional cordless telephone system.
[Explanation of symbols]
100 Master unit 200, 210, 220 Slave unit 129, 241 RAM
114 E ² PROM
240 ROM

Claims (4)

A master unit equipped with a first radio circuit and a second radio circuit that are used with a predetermined channel interval between them;
A cordless telephone system composed of first and second slave units that establish an external line function and an internal line function using the first and / or second wireless circuit;
When the slave units make an extension call according to the instruction from the first slave unit ,
And means for confirming the the first handset and the base unit, the first traffic channel that is already used in radio circuit,
Means for selecting a control channel having the confirmed call channel and a predetermined channel spacing;
A cordless telephone system comprising: means for making an extension call to the second slave unit by the second radio circuit using the selected control channel by the master unit . The cordless telephone system according to claim 1,
The master unit and each slave unit are provided with means for holding a success history recording the success / failure of link processing and the control channel used at that time,
If the slave units make an extension call,
Means for confirming a call channel used by the base unit in the first radio circuit;
Means for selecting a control channel having the confirmed call channel and a predetermined channel spacing;
If there are multiple corresponding control channels as a result of the search,
Means for determining a control channel to use based on the success history;
A cordless telephone system comprising means for making an extension call from the first slave unit to the second slave unit by the second radio circuit using the determined control channel . The cordless telephone system according to claim 2 ,
When making an extension call from a slave unit to another slave unit or master unit,
A cordless telephone system comprising: means for determining a control channel to be used by the first slave unit based on the success history held in the own unit. The cordless telephone system according to claim 2 or 3 ,
When making an extension call from the master unit to the slave unit,
A cordless telephone system, comprising: means for determining a control channel to be used based on the success history held by the base unit.

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