JP7389406B2 - Cordless telephone equipment, base unit of cordless telephone equipment, and slave unit of cordless telephone equipment - Google Patents

Description

This invention can also be used, for example, when a business telephone system is configured by being accommodated in a telephone control device such as a main device or a SIP (Session Initiation Protocol) server, and a base device and a handset are connected wirelessly. The present invention relates to a cordless telephone device.

In recent years, business phone systems (key telephone systems) have been constructed by connecting cordless telephone devices to telephone control devices such as main devices and SIP servers. A cordless telephone device functions as a single telephone device by wirelessly connecting a base unit and a slave unit. For example, a communication method based on the DECT (Digital Enhanced Cordless Telecommunication) standard may be used between a base unit and a slave unit that constitute a cordless telephone device.

In the DECT standard, the downlink communication method from the base unit to the slave unit is a time division duplex method that uses time division multiplexing, and the uplink communication method from the slave unit to the base unit is time division duplex. A multiple access method is specified. Further, the DECT standard specifies that the frequency band to be used is the "1.9 GHz band" and that the number of channels is five at maximum.

Further, according to the DECT standard, one channel of encoded data is divided into frames of 10 milliseconds (ms), and each frame is divided into 24 time slots, as shown in FIG. Note that hereinafter, a time slot will be simply referred to as a slot. The 12 slots S0 to S11 in the first half frame period of one frame are used for downlink from the base device to the slave device, and the 12 slots S12 to S23 in the second half frame period are used for the downlink from the base device to the slave device. Used for uplink from to the base unit.

In a DECT standard cordless telephone device used in a business phone system, if the power is not off, one cordless telephone device uses one slot out of 12 slots in the standby state (idle state) and A variety of control information, including synchronization signals, is transmitted from the terminal to the slave unit. The slot at this time is called a dummy bearer. Note that normally, multiple handsets can be connected to a base unit, but even if only one slave unit is connected to the base unit, it is also possible to connect multiple handsets to the base unit. Even when slave units are connected, control information and the like are transmitted to each slave unit using one slot (dummy bearer) in the standby state. In this case, information is not transmitted from the child device to the parent device.

In such a standby state, for example, when an incoming call is received and the telephone control device notifies the base unit of the incoming call, the base unit uses a dummy bearer to notify each slave unit of a data session connection request. The child device searches for an empty slot and contacts the parent device to try to obtain a slot to use for communication. The data session connection request is a request to prepare an environment in which the base unit and the slave unit can communicate with each other, and is not a request for incoming call notification. Then, when a slot for mutual communication between the base unit and slave unit is acquired in response to the data session connection request, the base unit releases the dummy bearer and receives an incoming call using the acquired downlink slot. Notify. At the same time, the base unit also specifies an uplink slot so that it can receive information from the slave unit.

The pair of downlink slot and uplink slot obtained in this way for mutual communication between the base device and the slave device is called a traffic bearer. Through the traffic bearer, various control information including synchronization signals and the like is transmitted, and after a communication line is established with the communication partner, voice information is also transmitted. Since the traffic bearer also transmits various control information, the process of identifying (obtaining) the traffic bearer and releasing the dummy bearer is called merging the dummy bearer with the traffic bearer.

In this way, after transitioning from the standby state to the call state, errors may occur in the call data due to interference waves from a nearby PHS (Personal Handy Phone System) telephone used by a third party, resulting in poor call quality. This may cause the sound quality to deteriorate. One measure for dealing with such a case is disclosed in Patent Document 1, which will be described later. The invention disclosed in Patent Document 1 determines whether or not there is interference due to signals transmitted from a PHS fixed station, and when it is determined that there is interference, a frequency band to be used to avoid the interference is determined. and setting slot timing.

JP2011-077985A

However, in the case of PHS type telephones, some devices release the acquired slot after communication (call) and reacquire the slot during communication. Additionally, a new PHS telephone may be installed, or a previously installed PHS telephone may be moved to another location. In addition to PHS telephones, frequencies near the frequency band used by DECT cordless telephone devices, such as wireless LAN (Local Area Network) equipment, short-range wireless communication equipment, wireless headphones, security cameras, and motion sensors, are also available. There are also various devices that use bands. In this way, the wireless environment may change in a relatively short period of time, or may change suddenly as wireless equipment is installed or moved, and may remain the same or change.

For this reason, if a user of a DECT type cordless telephone device feels that it is becoming difficult to make or receive calls, he or she may use a device that measures the received field strength etc. under the usage environment of the cordless telephone device. It becomes necessary to bring in a wireless environment and investigate the wireless environment for a certain period of time. Based on the results of this investigation, measures will be taken such as changing the installation location of other wireless devices and changing the installation location of DECT cordless telephone equipment. However, investigating the wireless environment becomes a large-scale task. Further, as described above, since the wireless environment changes, it is not always possible to appropriately grasp the wireless usage status during the survey period of the wireless environment.

In view of the above, it is an object of the present invention to enable the wireless usage status of a cordless telephone device to be easily and accurately grasped at an appropriate timing, and to ensure that necessary measures can be taken. purpose.

In order to solve the above problem, a cordless telephone device according to the invention as set forth in claim 1 includes:
A predetermined communication channel is divided into frames of a predetermined time unit, each of the frames is divided into a plurality of time slots, and wireless communication is performed between a base unit and a slave unit through the selected time slots for each frame. A cordless telephone device that performs
The parent device is
detection means for detecting the usage status of each of the time slots other than those used by the own device in the frame of the communication channel during a predetermined period;
usage rate calculation means for calculating a wireless usage rate of the communication channel based on the detection result of the detection means;
output means for outputting the wireless usage rate calculated by the usage rate calculation means ;
base device-side counting means for counting the number of successful incoming calls, the number of failed incoming calls, and the number of successful outgoing calls;
Acquisition means for acquiring the number of outgoing call failures from the handset;
A call loss rate is determined from the number of successful incoming calls, the number of failed incoming calls, the number of successful outgoing calls, and the number of failed outgoing calls from the handset acquired through the acquisition means. a call loss rate calculation means for calculating the
Equipped with
The output means of the base unit is capable of outputting the call loss rate calculated by the call loss rate calculation means in addition to the wireless usage rate,
The slave device is
handset-side counting means for counting the number of failed outgoing calls during the predetermined period;
providing means for providing the base unit with the number of outgoing call failures counted by the slave unit side counting unit;
It is characterized by having the following.

According to the present invention, the functions of the cordless telephone device make it possible to easily and accurately grasp the wireless usage status in which the cordless telephone device is used at an appropriate timing. This allows necessary measures to be taken in response to changes in the wireless environment.

FIG. 1 is a diagram for explaining an example of the overall configuration of a telephone system according to an embodiment. FIG. 2 is a block diagram showing a configuration example of a main device according to an embodiment. FIG. 3 is a diagram for explaining an example of data stored in a terminal-specific wireless usage status table configured in the main device. FIG. 2 is a block diagram showing a configuration example of a parent device according to an embodiment. FIG. 3 is a diagram for explaining an example of data stored in a wireless usage status table of a base device according to the embodiment. FIG. 3 is a diagram showing calculation formulas for wireless usage rate Ur and call loss rate Clr. FIG. 2 is a block diagram illustrating a configuration example of a slave device according to an embodiment. FIG. 2 is a flowchart for explaining a wireless usage situation understanding process performed by the base device according to the embodiment. FIG. FIG. 2 is a flowchart for explaining a process for counting the number of failed outgoing calls performed by the handset according to the embodiment. FIG. FIG. 2 is a diagram for explaining frames and slots of the DECT standard.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cordless telephone device, a base unit of the cordless telephone device, and a handset of the cordless telephone device of the present invention will be described below with reference to the drawings. In the embodiments described below, a case will be explained in which the cordless telephone device of the present invention is used in a telephone system called a so-called business phone system, which is installed in a company's office, for example.

[Telephone system configuration example]
FIG. 1 is a block diagram showing an example of the overall configuration of a telephone system 10 of this embodiment. In the telephone system 10, a plurality of cordless telephone devices 21, 22, and 23 according to the present invention are connected as extension telephone devices to a main device 1 as an example of a telephone control device. In this embodiment, in order to simplify the explanation, as shown in FIG. 1, three sets of cordless telephone devices 21, 22, and 23 are connected to the main device 1 to configure the telephone system 10. This will be explained using an example. However, it is of course possible to connect more cordless telephone devices to the main device 1 to construct a larger scale telephone system.

Each of the cordless telephone devices 21, 22, and 23 includes base sets BS1, BS2, and BS3 as base units, and handsets HS1, HS2, and HS3 as slave units, respectively. The base set is also sometimes called a "cell station" or "CS," and the handset is sometimes called a "personal station" or "PS." In the following, base sets BS1, BS2, and BS3 are referred to as base units BS1, BS2, and BS3, and handsets HS1, HS2, and HS3 are referred to as slave units HS1, HS2, and HS3. Each of the base units BS1, BS2, and BS3 is wirelessly connected to each of the slave units HS1, HS2, and HS3.

Note that it is also possible to wirelessly connect multiple handsets to each of the base units BS1, BS2, and BS3, but in this example, one slave unit is connected to one base unit. It is configured to be connected. Although not shown, the extension telephone devices connected to the main device 1 include not only the cordless telephone devices 21, 22, and 23, but also digital button telephone terminals as well as a normal business phone system. It is possible.

In this embodiment, the wireless connection between each of the base units BS1, B2, and BS3 of the cordless telephone devices 21, 22, and 23 and each of the slave units HS1, HS2, and HS3 is based on the above-mentioned DECT standard for digital cordless telephones. (method) using the TDMA/TDD method. The main device 1 can accommodate one or more telephone lines L1 to Lm (m is an integer of 2 or more). Base stations BS1, BS2, and BS3 of cordless telephone devices 21, 22, and 23 are connected to main device 1, respectively. In the example of FIG. 1, base units BS1, BS2, BS3 and main device 1 are connected by wire, but they may be connected wirelessly.

The main device 1 performs call control and line switching control for the plurality of cordless telephone devices 21, 22, 23, and other controls as a business phone, and also transmits a reference synchronization signal SYNC to the plurality of cordless telephone devices 21, 22, 23. It has a function to supply each. In this example, the reference synchronization signal SYNC is a signal with a period of 130 milliseconds (ms).

Each of the main units BS1, BS2, and BS3 of the cordless telephone devices 21, 22, and 23 synchronizes with the reference synchronization signal SYNC from the main device 1 and transmits one frame (10 A frame synchronization signal is generated as a synchronization signal with a period of milliseconds (ms), and based on the generated frame synchronization signal, wireless communication using the TDMA/TDD method using the DECT standard is performed on slave units HS1, HS2, and HS3. Execute between. Therefore, all of the plurality of cordless telephone devices 21, 22, and 23 operate in synchronization with the reference synchronization signal SYNC from the main device 1.

As shown in FIG. 1, each of the cordless telephone devices 21, 22, and 23 is a telephone terminal connected to the main device 1 to constitute a business phone system. Therefore, call control signals such as incoming call notifications and outgoing call requests and other control signals are transmitted and received with the main device 1. Note that other control signals include, for example, the LCD (Liquid Crystal Display) of the cordless telephone devices 21, 22, and 23 to notify the user of the operating status of other cordless telephone devices connected to the main device 1. There are control signals for controlling LEDs (Light Emitting Diodes), etc.

In some cordless telephone devices, the base unit includes a user interface such as a ringer, an LCD, an LED, and an operation section. However, there are cases where the master device only realizes the function of connecting the main device and the slave device, and the slave device includes a user interface such as a ringer, an LCD, an LED, and an operation section. In this case, various control signals are exchanged between the base unit and the slave unit. Also in this embodiment, the base units BS1, BS2, and BS3 of the cordless telephone devices 21, 22, and 23 basically do not have a user interface, but connect between the main unit 1 and the slave units HS1, HS2, and HS3. This function realizes the functions of

Each of base stations BS1, BS2, and BS3 is installed at a predetermined position within the office. As a result, as shown in FIG. 1, the base unit BS1 is enabled to communicate with the slave unit HS1, etc. within the wireless communication area Ar1, and the base unit BS2 is enabled to communicate with the slave unit HS2, etc. within the wireless communication area Ar2. communication with is possible. Furthermore, the base unit BS3 is enabled to communicate with the slave unit HS3 and the like within the wireless communication area Ar3.

In this way, each of the base units BS1, BS2, and BS3 and each of the slave units HS1, HS2, and HS3 have wireless communication areas Ar1, Ar2, and Ar3 in which wireless communication is possible based on their respective communication functions. form. The wireless communicable areas Ar1, Ar2, and Ar3 are provided so as to overlap little by little. Thereby, the handsets HS1, HS2, and HS3 can make a call while moving within the wireless communicable areas Ar1, Ar2, and Ar3 by switching the base units BS1, BS2, and BS3 with which they communicate.

In the example shown in FIG. 1, one or more other systems exist within the wireless communication area Ar1, such as a PHS telephone, a wireless LAN device, and wireless headphones. In this case, signals sent or received by other systems may interfere with communication between base unit BS1 and slave unit HS1, making it difficult to make or receive calls, or causing communication problems such as interruptions in calls. It is thought that this may be the cause. Therefore, the cordless telephone devices 21, 22, and 23 of this embodiment grasp the wireless communication status within the wireless communicable areas Ar1, Ar2, and Ar3 formed by the base units BS1, BS2, and BS3, and 1 can be notified.

Briefly, as indicated by "status notification" in FIG. 1, the cordless telephone device 21 is capable of grasping the wireless communication status within the wireless communication area Ar1 and notifying the main device 1 of this. It is. Similarly, the cordless telephone device 22 is capable of grasping the wireless communication situation within the wireless communication area Ar2 and notifying the main device 1 of this. Further, the cordless telephone device 23 is capable of grasping the wireless communication situation within the wireless communication possible area Ar3 and notifying the main device 1 of this.

Below, an example of the configuration of the main device 1 and the cordless telephone devices 21, 22, and 23 that make up the telephone system of this embodiment will be explained. Note that each of the base units BS1, BS2, and BS3 of the cordless telephone devices 21, 22, and 23 is configured similarly. Further, each of the slave units HS1, HS2, and HS3 of the cordless telephone devices 21, 22, and 23 is configured similarly. Therefore, the configurations of the cordless telephone devices 21, 22, and 23 will be explained using the cordless telephone device 21 as an example.

[Example of configuration of main device 1]
FIG. 2 is a block diagram showing an example of the configuration of the main device 1. As shown in FIG. As shown in FIG. 2, the main device 1 includes a line interface 11 to which telephone lines L1 to Lm are connected, a control circuit 12 equipped with a computer to control the entire main device 1, and a line LSI ( 13, a wireless usage status table 14 for each terminal, and a reference oscillator 15.

Under the control of the control circuit 12, the line interface 11 supplies voice signals (received voice signals) from the lines L1 to Lm to the line LSI section 13, and transmits control signals such as call control signals from the lines to the control circuit 12. Supply to 12. Also, under the control of the control circuit 12, the line interface 11 transmits voice signals (transmission voice signals) from the line LSI unit 13 to the other party through the lines L1 to Lm, and receives call control signals from the control circuit 12, etc. The control signal is also transmitted to the other party through the lines L1 to Lm.

The line LSI section 13 includes n extension processing circuits 131, 132, . . . , 13n and a timing signal generation section 130 corresponding to the n extension telephone devices. Note that the letter n as a subscript basically means an integer of 1 or more. However, since the extension processing circuits 131 and 132 are already present in FIG. 2, the letter n in FIG. 2 means an integer of 3 or more.

The timing signal generation unit 130 generates a transmission clock signal CK and a multiplexing/division timing signal TM from a reference clock signal from a high-precision reference oscillator 15 using a crystal oscillator, and processes n extension lines. It is supplied to circuits 131 to 13n. The n extension processing circuits 131 to 13n have exactly the same configuration, and each includes an audio signal processing section 31, a control signal processing section 32, a synchronization signal processing section 33, and a multiplexing/division processing section. It consists of 34.

The audio signal processing section 31 is connected to the line interface 11 and also to the multiplexing/division processing section 34, and processes the received audio signal from the line interface 11 and the transmission from the multiplexing/division processing section 34. This is a speech signal processing circuit. The audio signal processing section 31 is supplied with a transmission clock signal CK from the timing signal generation section 130.

The control signal processing unit 32 is connected to the control signal input/output terminal of the control circuit 12, and is also connected to the multiplexing/division processing unit 34, and handles calls at the time of origination, reception, and termination of a call. This is a processing circuit for control signals such as control signals. That is, the control signal processing section 32 is a circuit for processing both control signals from the main device 1 to the cordless telephone device and control signals from the cordless telephone device to the main device 1. The control signal processing section 32 is also supplied with the transmission clock signal CK from the timing signal generation section 130.

The synchronization signal processing section 33 is connected to the synchronization signal output terminal of the control circuit 12 and also to the multiplexing/division processing section 34, and receives a reference synchronization signal having a predetermined synchronization signal pattern from the control circuit 12. This is a SYNC processing circuit. Similarly, the synchronization signal processing section 33 is also supplied with the transmission clock signal CK from the timing signal generation section 130.

The multiplexing/division processing unit 34 is connected to the audio signal processing unit 31, the control signal processing unit 32, and the synchronization signal processing unit 33, and is also connected to each of the base units BS1 to BSn of the cordless telephone devices 21 to 2n. Ru. The multiplexing/division processing unit 34 then generates the audio signal from the audio signal processing unit 31, the control signal from the control signal processing unit 32, and the synchronization signal based on the timing signal TM from the timing signal generation unit 130. A multiplexed signal is generated by multiplexing (time division multiplexing) with the reference synchronization signal SYNC from the processing unit 33, and the generated multiplexed signal is supplied to each of base units BS1 to BSn. Furthermore, the multiplexing/division processing unit 34 divides the multiplexed signal from each of the base units BS1 to BSn into an audio signal and a control signal based on the timing signal TM from the timing signal generation unit 130. The audio signal is supplied to the audio signal processing section 31, and the control signal is supplied to the control signal processing section 32, respectively.

The terminal-by-terminal wireless usage status table 14 is formed by the control circuit 12 based on the wireless usage rate and call loss rate provided from each of base stations BS1, BS2, and BS3. FIG. 3 is a diagram for explaining an example of data stored in the wireless usage status table 14 for each terminal. As explained using FIG. 1, FIG. 3 is created when there are other systems in the wireless communication area Ar1 and no other systems exist in the wireless communication areas Ar2 and Ar3. be. As shown in FIG. 3, the terminal-based wireless usage status table 14 of this embodiment includes "search date and time", "base unit ID" (indicated as "base unit" in FIG. 3), as shown at the top. ”, “wireless usage rate”, and “call loss rate” are stored.

The “search date and time” is information indicating the period of data collection for calculating the wireless usage rate and call loss rate in base units BS1, BS2, and BS3. The "base unit ID" is information for identifying a base unit under the main device 1, and includes, for example, an extension number, an IP address, a URL, a MAC (Media Access Control) address, and the like. In FIG. 3, "BS1," "BS2," and "BS3" are written as "base unit IDs" to clearly distinguish the base units. "Radio usage rate" is information indicating how much each slot of each frame of the communication channel to be used is used during the collection period. The "call loss rate" is information indicating how many of the outgoing calls and incoming calls that occurred during the collection period are not processed correctly and fail. Note that the "wireless usage rate" and the "call loss rate" are calculated in each of base stations BS1, BS2, and BS3, and the method of calculation will be described later.

In this embodiment, the search date and time can be set in advance for the main device 1, and this set information is used as the "search date and time" in the wireless usage status table by terminal 14. is also used. When the set search date and time arrive, the main device 1 collects data for calculating the wireless usage rate and call loss rate, calculates the wireless usage rate and call loss rate, and notifies the subordinate base unit BS1, Controls BS2 and BS3. In response to this, base units BS1, BS2, and BS3 execute data collection for calculating the wireless usage rate and call loss rate during the specified collection period (the period indicated by the search date and time), as will be described in detail later. , calculates the wireless usage rate and call loss rate and notifies the main device 1 of the calculated wireless usage rate and call loss rate.

Note that the "search date and time" is not limited to what is set in advance. Among the telephone terminals connected to the main device 1, the main telephone terminal issues an instruction to the main device 1, instructs the main device 1 at an appropriate timing and for an appropriate period, and controls the subordinate base devices BS1, BS2, and BS3. You can also do it. That is, data collection for calculating the wireless usage rate and call loss rate and calculation of the wireless usage rate and call loss rate can be performed at predetermined timing, or can be performed at any timing as necessary.

Note that in the case of the wireless usage status table 14 by terminal shown in FIG. This is an example where the search date and time is used as the information collection period. Therefore, the wireless usage rate and call loss rate in the terminal-by-terminal wireless usage status table 14 in FIG. 3 are calculated based on the information collected during the collection period.

As described using FIG. 1, other systems exist in the wireless communicable area Ar1 where the base unit BS1 and slave unit HS1 are located. Therefore, when information is collected and the wireless usage rate and call loss rate are calculated at the specified search date and time, as shown in FIG. It is shown that the usage rate is 42% and the call loss rate is 3%. Note that the call loss rate is usually determined to be high even by a few percent. As described above, it can be seen that the wireless usage status of the base unit BS1 and the slave unit HS1 is high in both the wireless usage rate and the call loss rate, and it is necessary to take some measures.

Note that, as shown in FIG. 1, other systems exist in the wireless communicable area Ar2 where the base unit BS2 and the slave unit HS2 are located, and the wireless communicable area Ar3 where the base unit BS3 and the slave unit HS3 are located. do not. Therefore, as shown in FIG. 3, in the communication channel between the base unit BS2 and the slave unit HS2 and the communication channel between the base unit BS3 and the slave unit HS3, both the wireless usage rate and the call loss rate are low. It is understood that the wireless usage situation is good.

Although not shown in FIG. 2, an address management section is also connected to the main device 1. The address management unit stores and manages correspondence between terminal identification information such as extension numbers of the cordless telephone devices 21, 22, and 23 connected to the main device 1 and each of the extension processing circuits 131 to 13n. Based on the information of this address management unit, it is possible to appropriately grasp the operating status of the cordless telephone devices connected to the main device 1, and to appropriately control each of the cordless telephone devices connected to the main device 1. can.

[Example of configuration of cordless telephone devices 21, 22, 23]
Next, a configuration example of the cordless telephone devices 21, 22, and 23 of this embodiment, which are composed of a base unit and a slave unit, will be explained. Here, as mentioned above, the case of the cordless telephone device 21 composed of the base unit BS1 and the slave unit HS1 will be explained as an example.

<Example configuration of base unit>
FIG. 4 is a block diagram showing an example of the configuration of base unit BS1. As shown in FIG. 4, the base unit BS1 includes a control circuit 41 for controlling the entire base unit BS1, a line LSI section 42, a synchronization signal generation circuit 43, a wireless communication circuit 44, and oscillators 45 and 46. It is composed of:

The control circuit 41 includes a computer. The control circuit 41 has a function of controlling call control and the like in this base unit BS1. The control circuit 41 also includes a wireless usage status table (denoted as wireless usage status TBL in FIG. 4) 411, a calculation processing section 412, and a counting section 413. Each of these parts has the function of calculating the wireless usage rate of the communication channel used by its own device during a predetermined period (instructed data collection period) and the call loss rate through the communication channel during the predetermined period, and notifying the main device 1. Realize. Note that details of each part of the control circuit 41 will be described later.

The line LSI section 42 is a circuit for exchanging audio signals, control signals, and synchronization signals with the main device 1. The line LSI section 42 includes a division/multiplexing processing section 421, a control signal processing section 422, an audio signal processing section 423, a synchronization signal detection section 424, and a PLL (Phase locked Loop) section 425. The PLL section 425 is supplied with an oscillation signal of a reference frequency from the oscillator 45 and also supplied with a multiplexed signal from the main device 1 . In this example, the frequency of the oscillation signal from the oscillator 45 is, for example, 2048 MHz (0.488 nanoseconds (ns)).

The PLL section 425 extracts the clock signal CK component from the timing signal generation section of the main device 1 from the multiplexed signal from the main device 1 by so-called self-clocking. The PLL unit 425 compares the phases of the extracted clock signal CK component and the oscillation signal from the oscillator 45, and based on the comparison result, the system of the base unit BS1 synchronizes the oscillation signal of the oscillator 45 with the clock signal CK component. Generates a clock signal SCK. The PLL section 425 supplies the generated system clock signal SCK to each of the division/multiplexing processing section 421, the control signal processing section 422, the audio signal processing section 423, and the synchronization signal detection section 424 as a clock signal for signal processing. It is also supplied to the synchronization signal generation circuit 43.

The division/multiplexing processing section 421 is connected to the main device 1 as well as to the control signal processing section 422, the audio signal processing section 423, and the synchronization signal detection section 424. The division/multiplexing processing unit 421 divides (separates) the multiplexed signal from the main device 1 into a control signal, an audio signal, and a reference synchronization signal SYNC. The control signal divided (separated) in the division/multiplexing processing section 421 is supplied to the control signal processing section 422, the audio signal to the audio signal processing section 423, and the reference synchronization signal SYNC to the synchronization signal detection section 424. be done.

Furthermore, the division/multiplexing processing unit 421 multiplexes the control signal from the control signal processing unit 422 and the audio signal from the audio signal processing unit 423 to generate a multiplexed signal, and the generated multiplexed signal is supplied to the main device 1. The control signal processing section 422 is connected to the control signal input/output terminal of the control circuit 41 and is also connected to the division/multiplexing processing section 421 . The control signal processing unit 422 handles control signals such as call control signals at the time of making and receiving calls, and at the time of ending a call (control signals from the main device 1 to the cordless telephone device 21 and from the cordless telephone device 21 to the main device 1 (both control signals to and from) processing circuit. The control signal processing unit 422 also realizes a function of notifying the main device 1 of the wireless usage rate and call loss rate calculated by the control circuit 41, as will be described later.

The audio signal processing section 423 is connected to the wireless communication circuit 44 and also to the division/multiplexing processing section 421, and processes the transmitted audio signal received from the slave unit HS1 from the wireless communication circuit 44 and the division /This is a processing circuit for the received voice signal from the multiplexing processing section 421. The synchronization signal detection section 424 receives the reference synchronization signal SYNC from the division/multiplexing processing section 421 and detects a predetermined synchronization signal pattern included in the reference synchronization signal SYNC. As a result, the synchronization signal detection unit 424 generates a reference synchronization pulse PS that is synchronized with the reference synchronization signal SYNC and has the same period (130 ms) as the reference synchronization signal SYNC as a signal at the time of detection. The synchronization signal detection section 424 supplies the generated reference synchronization pulse PS to the synchronization signal generation circuit 43.

The synchronization signal generation circuit 43 includes a counter 431 and a synchronization signal generation section 432. The counter 431 is supplied with a reference synchronization pulse PS with a period of 130 ms from the synchronization signal detection section 424 of the line LSI section 42 to a preset terminal PRE, and a system clock signal SCK from the PLL section 425 as a count input. Ru. The output count value CNT of the counter 431 is supplied to the synchronization signal generation section 432. The synchronization signal generation unit 432 generates a synchronization signal FL having a frame period (10 ms) according to the DECT standard from the output count value CNT of the counter 431. The synchronization signal generation circuit 43 supplies the frame synchronization signal FL generated by the synchronization signal generation section 432 to the wireless communication circuit 44.

The wireless communication circuit 44 includes a control section 441, a TDMA modulation/demodulation section 442, and a wireless communication section (indicated as "RF" in FIG. 4) 443. The wireless communication unit 443 is a circuit unit for performing wireless communication with the slave device HS1. The control section 441 is connected to the TDMA modulation/demodulation section 442 and the wireless communication section 443, and is also connected to the control circuit 41. The control section 441 controls the overall operation of the wireless communication circuit 44 and supplies a control signal based on the control signal obtained from the control circuit 41 to the TDMA modulation/demodulation section 442 . The control section 441 also has a function of supplying information obtained from the TDMA modulation/demodulation section 442 to the control circuit 41.

The TDMA modulation/demodulation section 442 is connected to the control section 441 and the audio signal processing section 423 of the line LSI section 42, and is also connected to the wireless communication section 443. Modulation is performed to transmit the audio signal to slave device HS1. The signal modulated by this TDMA modulation/demodulation section 442 is transmitted to the slave device HS1 via the wireless communication section 443. Further, the TDMA modulation/demodulation section 442 demodulates the audio signal and the control signal from the received signal from the slave unit HS1 received by the wireless communication section 443, and supplies the demodulated audio signal to the audio signal processing section 423, and the demodulated audio signal is The control signal is supplied to the control section 441.

The TDMA modulation/demodulation section 442 includes a PLL section 4421 for clock generation. The PLL section 4421 is supplied with an oscillation signal from the oscillator 46, and is also supplied with a frame synchronization signal FL from the synchronization signal generation circuit 43. The PLL section 4421 compares the phases of the frame synchronization signal FL from the synchronization signal generation circuit 43 and the oscillation signal from the oscillator 46, and synchronizes the oscillation signal of the oscillator 46 with the frame synchronization signal FL based on the comparison result. generate timing and clock signals for The TDMA modulation/demodulation section 442 uses a timing signal and a clock signal synchronized with the frame synchronization signal FL to generate a transmission signal to the slave unit HS1 in a period corresponding to the downlink slot that can be allocated and used. The slots in the link are used to process the received signal from the slave unit HS1.

Note that normally, when the base unit BS1 is connected to the main device 1 and in a standby state, it starts synchronization processing for communication with the slave unit HS1, and always sends a synchronization signal to the slave unit HS1 through a dummy bearer. and control information to maintain a state in which communication is possible. That is, the control unit 441 of the wireless communication circuit 44 of the base unit BS1 sends the transmission signal generated by the TDMA modulation/demodulation unit 442 to the slave unit HS1 through the wireless communication unit 443 using one slot set in the own unit. , When a response is returned from the slave unit HS1, synchronization is established by using the slot used for transmitting the transmission signal for downlink and using the slot in which the response from slave unit HS1 was received for uplink. control to perform transmission and reception.

Further, when the base unit BS1 is notified of an incoming call, the base unit BS1 sends this to the slave unit HS1. When the handset HS1 receives the notification of the incoming call, it performs a search process for empty slots, identifies the slot (traffic bearer) used for communication, notifies the base unit BS1, and uses the obtained slot to The device BS1 and the slave device HS1 are connected to each other so that a state where a telephone conversation can be made can be established.

Further, the TDMA modulation/demodulation section 442 includes an RSSI (Received Signal Strength Indication) detection section 4422. The RSSI detection section 4422 functions under the control of the control circuit 41 through the control section 441. During the data collection period instructed by the control circuit 41, the RSSI detection unit 4422 receives a signal in units of one frame through the communication channel used for communication with the slave device, and reads signals in each slot of each received frame. Performs processing to detect the strength of existing signals (radio waves). In this case, the RSSI detection unit 4422 detects the received signal strength of a slot other than the slot used by the own device for communication with the slave device.

The RSSI detection unit 4422 determines that a slot in which a signal exceeding a certain threshold value, for example, "-62 dBm" exists, is in use, and outputs information indicating that the slot is in use. Information detected by the RSSI detection section 4422 is notified to the control circuit 41 through the control section 441. The reception signal strength detection process by the RSSI detection unit 4422 is performed as so-called background processing, which is separate from the process related to normal communication processing.

Note that the RSSI detection unit 4422 can detect the received signal strength of each slot other than that used by the own device in each consecutive frame during the instructed data collection period. Also, for example, it receives one frame of signal at predetermined intervals, such as every 0.64 seconds (64 frames) or every 1.28 seconds (128 frames), and receives each slot other than the one used by its own device. Signal strength can also be detected. In this embodiment, as explained using FIG. 3, in order to calculate the wireless usage rate and call loss rate over a relatively long period, such as one hour in the morning from 10:00 to 11:00, for example, , the received signal strength is detected every 1.28 seconds (128 frames).

Furthermore, the frequency bands permitted in Japan for DECT standard cordless telephone devices are 5 waves (5 frequency channels) F1 to F5 between 1893.5 MHz and 1906.1 MHz. In some cases, PHS standard telephones are operating in the frequency band, so if you can confirm the control channel (CCH) used by the PHS standard telephone, the central three carriers (three communication channels F2, F3, F4) are not used. Also in the cordless telephone devices 21, 22, and 23 of this embodiment, communication channels F1 and F5 are used, and communication channels F2, F3, and F4 are not used.

FIG. 5 is a diagram for explaining an example of data stored in the wireless usage status table 411 formed by the control circuit 41 based on the detection result from the RSSI detection unit 4422. In order to simplify the explanation, FIG. 5 shows a wireless usage status table 411 formed by the control circuits 41 of base unit BS1, base unit BS2, and base unit BS3, respectively. Therefore, in FIG. 5, the "base unit" column at the left end indicates which base unit is used to form the wireless usage status table 411. As shown in FIG. 5, the wireless usage status table 411 of each base unit includes storage columns for "wireless usage rate", "frequency", each slot from downlink slot S0 to slot S11, and uplink slot S12 to slot A storage column for each slot of S23 is provided.

The “wireless usage rate” is information calculated based on the information in the wireless usage status table 411, and will be described in detail later. "Frequency" corresponds to a communication channel (frequency channel) used between the base unit and the slave unit. In this embodiment, as described above, among the five usable channels, the central three communication channels F2, F3, and F4 are not used, but the communication channels F1 and F5 on both sides are used. In the storage column of each downlink slot of each frame of the communication channels F1 and F5, information indicating that the slot is used by the own device and information based on the detection output from the RSSI detection unit 4422 are stored.

The control circuit 41 knows which slot the machine uses as a dummy bearer DM to transmit control signals, etc., and which slot it uses to communicate with the slave machine, and this information is used as a wireless It is recorded in the usage status table 411. In the wireless usage status table 411 of the base unit BS1 shown in FIG. 5, as shown with diagonal lines, the downlink slot S0 of the communication channel F1 is used as a dummy bearer DM, and the slot S1 is used for communication with the slave unit HS. It is managed that it is used for

Furthermore, in base unit BS1, information is updated in wireless usage status table 411 based on information from RSSI detection unit 4422. As a result, in base unit BS1, signals of other systems are present in downlink slots S4, S6, S8, and S10 of communication channel F1, as shown in other 1, other 2, other 3, and other 4. and is known to be in use. In addition, in base unit BS1, signals of other systems are present in downlink slots S5, S7, S9, and S11 of communication channel F5, as shown in other 5, other 6, other 7, and other 8. , is known to be in use.

Furthermore, as mentioned above, in the case of a DECT standard cordless telephone device, slots S0 to S11 are used as downlinks from the base unit to the handset, and slots S12 to S23 are used for downlinks from the handset to the base unit. It is used as an uplink. Therefore, the uplink slot paired with the downlink slot is determined to be in use. Therefore, in the case of the example shown in FIG. 5, base unit BS1 determines that uplink slots S12 and S13 of communication channel F1 are used by itself. Furthermore, in base unit BS1, uplink slots S16, S18, S20, and S22 of communication channel F1 are determined to be used by other systems, as shown in Other 1, Other 2, Other 3, and Other 4. There is. Furthermore, in base unit BS1, slots S17, S19, S21, and S23 of communication channel F5 are determined to be used by other systems, as shown in Other 5, Other 6, Other 7, and Other 8.

As mentioned above, if a downlink slot cannot be used, bidirectional communication is not possible even if an uplink slot can be used. Therefore, the utilization rates of the communication channels F1 and F5 used by the base unit BS1 to communicate with the slave unit may be considered for the downlink, assuming that the uplink will be in the same state as the downlink. Therefore, as shown in FIG. 5, it is determined that 10 slots are in use out of 24 slots consisting of 12 slots S0 to S11 of communication channel F1 and 12 slots S0 to S11 of communication channel F5. has been done. Therefore, the wireless usage rate is calculated at 10 slots/24 slots and is calculated to be about 42%.

FIG. 6 is a diagram showing calculation formulas for the wireless usage rate Ur and the call loss rate Clr. The radio usage rate Ur can be determined by dividing the number of used slots US by the total number of slots TS, as shown in equation (1) of FIG. Therefore, as mentioned above, and as shown in the column of wireless usage rate of base unit BS1 in FIG. By dividing by , the wireless usage rate can be calculated to be approximately 42%. In this case, it can be seen that nearly half of the slots are in use, so it can be seen that it is difficult to acquire slots between the base unit BS1 and the slave unit HS1.

Regarding base unit BS2, the radio usage status table 411 shows that downlink slots S2 and S3 are used as dummy bearers and corresponding uplink slots S14 and S15 are in use in communication channel F1. It is managed by. Similarly, regarding base unit BS3, in the communication channel F1, downlink slots S4 and S5 are used as dummy bearers, and the corresponding uplink slots S16 and S17 are in use, which is shown in the radio usage status table. It is managed by 411. In this case, the wireless usage rate Ur of base unit BS2 and base unit BS3 can be understood to be 2 slots/24 slots = approximately 9% according to equation (1) in FIG.

In this way, in the control circuit 41, in the wireless usage status table 411, the slots of the communication channels F1 and F5 used by the own device and the slots used by other systems are ascertained. The calculation processing unit 412 of the control circuit 41 calculates the wireless usage rate Ur by dividing the number of used downlink slots US by the total number of downlink slots TS based on the information grasped by the wireless usage status table 411. Calculate. Furthermore, the calculation processing unit 412 of the control circuit 41 also calculates the call loss rate Clr.

The call loss rate Clr is calculated based on the number of successful incoming calls InS, the number of failed incoming calls InF, the number of successful outgoing calls OtS, and the number of failed outgoing calls OtF. The number of successful incoming calls InS is the number of times when an incoming call occurs at the base unit, which is notified to a subordinate slave unit, and the slave unit returns a response, and is counted by the base unit. The number of incoming call failures InF is the number of cases where an incoming call occurs on the base unit, this is notified to the slave unit under control, and the slave unit does not return any response, and is counted on the base unit. . The number of successful outgoing calls OtS is the number of outgoing calls performed by the base unit in response to a call request from the slave unit, and is counted by the base unit. The number of outgoing call failures OtF is the number of times in which a response was not returned from the base unit even though the slave unit sent a call request to the base unit, and is counted by the slave unit.

Therefore, in the counting unit 413 of the control circuit 41 of the base unit BS1, during the data collection period according to the instruction from the main device 1, the number of successful incoming calls InS, the number of failed incoming calls InF, the number of successful outgoing calls OtS count. Further, as will be described in detail later, the number of outgoing call failures OtF is counted in the slave unit HS1 and notified to the base unit BS1. The calculation processing unit 412 calculates the call loss rate using the number of successful incoming calls InS, the number of failed incoming calls InF, the number of successful outgoing calls OtS counted by the counting unit 413, and the number of failed outgoing calls OtF notified from the handset HS1. Calculate Clr.

The call loss rate Clr can be calculated by dividing the sum of the number of incoming call failures InF and the number of outgoing call failures OtF (number of call failures) by the total number of calls, as shown in equation (2) of FIG. The total number of calls is the sum of the total number of incoming calls, which is the sum of the number of successful incoming calls InS and the number of failed incoming calls, InF, and the total number of outgoing calls, which is the sum of the number of successful outgoing calls OtS and the number of failed outgoing calls OtF. This makes it possible to grasp how many incoming or outgoing calls out of the total number of calls have failed.

In this way, the calculation processing unit 412 of the control circuit 41 of the base unit BS1 can calculate the wireless usage rate based on the contents of the wireless usage status table 411, and also calculates the wireless usage rate based on the count value of the counting unit 413 and the count from the slave unit HS1. Based on the value, the call loss rate can also be calculated. The wireless usage rate Ur and call loss rate Clr calculated by the control circuit 41 are supplied to the main device 1 through the control signal processing section 422 and the division/multiplexing processing section 421, and are used to calculate the wireless usage status by terminal as explained using FIG. It will be used to form the table 14.

In this way, the base unit BS1 is located between the main unit 1 and the slave unit HS1, and controls incoming and outgoing calls to enable telephone calls, and also operates in the background according to instructions from the main unit 1. It is capable of searching the wireless usage status of communication channels and notifying the main device 1 of this.

<Example of configuration of slave unit>
FIG. 7 is a block diagram showing an example of the configuration of slave device HS1. As shown in FIG. 7, the handset HS1 includes a wireless communication circuit 51, a control circuit 52, a codec circuit 53, an oscillator 54, a microphone 55, and a speaker 56. The microphone 55 constitutes a transmitter, and the speaker 56 constitutes a receiver. The wireless communication circuit 51 includes a control section 511, a TDMA modulation/demodulation section 512, and a wireless communication section (indicated as "RF" in FIG. 7) 513. The wireless communication unit 513 is a circuit unit for performing wireless communication with the base unit BS1.

The control section 511 is connected to the TDMA modulation/demodulation section 512 and the wireless communication section 513, and is also connected to the control circuit 52. The control section 511 controls the overall operation of the wireless communication circuit 51 and supplies a control signal based on the control signal obtained from the control circuit 52 to the TDMA modulation/demodulation section 512. Further, the control section 511 includes a counting section 5111. The counting unit 5111 calculates whether a response is returned from the base unit BS1 even though the slave unit HS1 performs a calling operation and sends a call request to the base unit BS1 during a predetermined period according to an instruction from the base unit. Instead, the number of failed outgoing calls, that is, the number of failed outgoing calls, is counted. After the predetermined period has elapsed, the number of outgoing call failures counted by the counting unit 5111 is supplied from the control unit 511 to the TDMA modulation/demodulation unit 512 (described later), where it is modulated and then sent to the base unit BS1 via the wireless communication unit 513. Sent.

The TDMA modulation/demodulation section 512 is connected to the control section 511 and the wireless communication section 513 as well as to the codec circuit 53, and transmits a control signal from the control section 511 and an audio signal from the codec circuit 53 to the base unit BS1. Perform modulation to The signal modulated by the TDMA modulation/demodulation section 512 is transmitted to the base unit BS1 via the wireless communication section 513. Further, the TDMA modulation/demodulation section 512 demodulates the audio signal and the control signal from the received signal from the base unit BS1 received by the wireless communication section 513, supplies the demodulated audio signal to the codec circuit 53, and supplies the demodulated control signal to the codec circuit 53. is supplied to the control section 511.

The TDMA modulation/demodulation section 512 includes a PLL section 5121 for clock generation. The PLL section 5121 is supplied with an oscillation signal from the oscillator 54 and a demodulated signal of the received signal from the wireless communication section 513. A clock signal synchronized with the clock component of the demodulated signal is generated. The clock signal from the PLL section 5121 is used as a processing clock signal in the TDMA modulation/demodulation section 512.

The codec circuit 53 decodes the audio signal demodulated by the TDMA modulation/demodulation section 512, converts it into an analog audio signal, supplies the analog audio signal to the speaker 56, and outputs it as received audio. Further, the codec circuit 53 encodes the analog audio signal picked up by the microphone 55 and supplies it to the TDMA modulation/demodulation section 512 . Note that when the handset HS1 makes a call, the control circuit 52 transmits a call control signal at the time of the call to the base unit BS1 through the wireless communication circuit 51, and also controls the call when the call is received from the base unit BS1. When a signal is received, processing such as emitting a ringtone from the speaker 56 is performed.

Note that the control unit 511 of the wireless communication circuit 51 controls the TDMA modulation/demodulation unit 512 in accordance with the control signal from the base unit BS1 corresponding to its own unit, and searches for a slot to be used for communication in the downlink and uplink. It is possible to specify the information and perform reception/transmission processing. That is, during standby, the base unit BS1 and the slave unit HS1 are configured to be able to transmit and receive control signals through one predetermined slot (dummy bearer) in the downlink and uplink. For example, when a simultaneous incoming call occurs and the incoming call notification from the main device 1 is notified to the slave unit HS1 via the base unit BS1, the slave unit HS1 performs a search process for an empty slot to use for the call. Get slot. The slave unit HS1 cooperates with the base unit BS1 to use the acquired empty slot as a traffic bearer to make a call.

In this way, the control unit 511 of the wireless communication circuit 51 specifies the slot used for communication with the base unit BS1 in response to the control signal from the base unit BS1, and specifies the slot to be used for communication with the base unit BS1, and connects to the base unit BS1. Can be done. Further, the control unit 511 of the wireless communication circuit 51 can also release (release) the connection with the base unit BS1 in response to a control signal from the base unit BS1. Further, the control unit 511 of the wireless communication circuit 51 specifies a slot to be used for communication with the other base unit according to a control signal from another base unit with which communication is possible, and connects the other base unit to the other base unit. You can connect to.

In the base unit BS1 and slave unit HS1 having the above-described configuration, it is possible to grasp the wireless usage status of the communication channel and calculate the wireless usage rate Ur from the grasped wireless usage status. Further, in the base unit BS1 and slave unit HS1 having the above-described configurations, it is possible to count numerical values related to calls and calculate the call loss rate Clr based on this. The calculated wireless usage rate Ur and call loss rate Clr can be output to the outside. In this embodiment, the output is sent to the main device 1, the main device 1 manages each cordless telephone device 21, 22, and 23, identifies the cordless telephone device whose communication status is deteriorating, and takes appropriate action. You will be able to take action.

Note that the wireless usage rate Ur is information indicating how crowded the communication channel being used is. Further, the call loss rate Clr is information indicating whether incoming and outgoing calls are not being properly processed through the communication channel being used, that is, whether they are being blocked. Therefore, even if the wireless usage rate Ur is high to a certain extent, if the call loss rate Clr is low, it can be determined that although there is no problem with telephone calls at this stage, there is a high possibility that there will be a problem with telephone calls in the future.

Furthermore, if the wireless usage rate Ur is high and the call loss rate Clr is also high, it can be determined that it is necessary to take immediate measures such as moving to another system or moving the base unit. Also, although it is usually difficult to imagine, if the wireless usage rate Ur is low and the call loss rate Clr is high, there is a high possibility that some kind of failure has occurred in the cordless telephone equipment, so it is necessary to immediately investigate the cause. It can be determined that Of course, if the wireless usage rate Ur is low and the call loss rate Clr is also low, it can be determined that the communication environment is good and the current status should be maintained.

The above explanation is about the base unit BS1 and slave unit HS1 of the cordless telephone device 21, but as mentioned above, the base unit BS2 to BSn and slave unit HS2 to HSn of the other cordless telephone devices 22 to 2n are explained. also has a similar configuration. Furthermore, the slave units HS1, HS2, and HS3 can move and communicate with nearby base units BS1, BS2, and BS3 to make phone calls. Therefore, the base units BS1, BS2, and BS3 identify the slave units HS1, HS2, and HS3 that can communicate with themselves, calculate the call loss rate Clr with those slave units, and It is also possible to output the call loss rate Clr in a distinguishable manner.

[Summary of operations of base unit BS1 and slave unit HS1]
Next, the processing performed in each of the base unit BS1 and the slave unit HS1 having the above-described configurations will be summarized. In the following, as explained using FIG. 1, the case where the slave unit HS1 is located within the wireless communicable area Ar1 formed by the base unit BS1 will be explained as an example. Of course, similar processing is performed between other parent devices and child devices. That is, similar processing is performed between the base unit and the slave unit located in the communicable area formed by the base unit.

<Processing of base unit BS1>
FIG. 8 is a flowchart for explaining the wireless usage status grasping process performed by base unit BS1. The process shown in FIG. 8 is a process executed mainly in the control circuit 41 of the base unit BS1 at predetermined timings. When the process shown in FIG. 8 is executed, the control circuit 41 determines whether or not the main device 1 has instructed the start of the wireless usage status understanding process (step S101). That is, in the process of step S101, the control circuit 41 determines, through the division/multiplexing processing section 421 and the control signal processing section 422, whether or not the instruction to start the wireless usage status grasping process is received from the main device 1. Discern. In the determination process of step S101, when it is determined that the instruction to start the wireless usage situation understanding process has not been received from the main device 1, the process shown in FIG. 8 is ended and the next execution timing is waited.

Assume that in the determination process in step S101, it is determined that an instruction to start the wireless usage status understanding process has been received from the main device 1. In this case, the control circuit 41 instructs the handset HS1 located within the wireless communication area Ar1 of the own device to start counting the number of outgoing call failures OtF (step S102). In the process of step S102, the control circuit 41 forms a control signal instructing to start counting the number of outgoing call failures OtF, and transmits this through the control section 441, TDMA modulation/demodulation section 442, and radio communication section 443 of the wireless communication circuit 44. Send to slave unit HS1.

Next, the control circuit 41 controls the counting unit 413 to start counting success and failure of incoming calls and outgoing calls (step S103). That is, in step S103, the control circuit 41 causes the counting unit 413 to start counting the number of successful incoming calls, the number of failed incoming calls, and the number of successful outgoing calls. Furthermore, the control circuit 41 controls the RSSI detection section 4422 of the TDMA modulation/demodulation section 442 to start up through the control section 441, and starts creating the radio usage status table 411 based on the detection output from the RSSI detection section 4422. (Step S104).

Thereafter, the control circuit 41 determines whether a predetermined event has occurred that causes the wireless usage status understanding process to end (step S105). In step S105, for example, when an instruction to end the grasping process has arrived from the main device 1, or when it has been detected that the end time of a predetermined period for executing the instructed grasping process has come, the grasping process is performed. It is determined that a predetermined event that terminates the process has occurred. Although not shown in FIG. 4, the arrival of the end time can be determined based on time information from a clock circuit built in base unit BS1.

In the determination process of step S105, when it is determined that no event has occurred that causes the determination process to end, the determination process, that is, the above-mentioned counting process and wireless usage table creation process is continued. Assume that in the determination process in step S105, it is determined that an event that causes the grasping process to end has occurred. In this case, the control circuit 41 ends the process of creating the wireless usage status table 411, controls the calculation processing unit 412, and calculates the wireless usage rate Ur based on the information of the created wireless usage status table 411. A calculation process is performed (step S106).

Next, the control circuit 41 acquires the number of outgoing call failures from the slave device HS1 under its control (step S107). In step S107, the control circuit 41 forms a request for providing the number of outgoing call failures, and transmits this to the slave unit HS1 through the control unit 441, TDMA modulation/demodulation unit 442, and wireless communication unit 443. Accordingly, the number of outgoing call failures transmitted from the handset HS1 is received through the wireless communication section 443, demodulated by the TDMA modulation/demodulation section 442, and acquired by the control circuit 41 through the control section 441.

Further, the control circuit 41 controls the calculation processing unit 412 to calculate the call loss rate Clr according to equation (2) in FIG. 6 (step S108). That is, the calculation processing unit 412 uses the number of failed outgoing calls OtF from the handset HS1, the number of successful incoming calls InS counted by the counting unit 413, the number of failed incoming calls InF, and the number of successful outgoing calls OtS, The call loss rate Clr is calculated according to equation (2) in FIG. After that, the control circuit 41 forms notification information by adding the identification ID of its own device to the calculated wireless usage rate Ur and call loss rate Clr, and then sends the information through the control signal processing section 422 and the division/multiplexing processing section 421. The information is transmitted to the main device 1 (step S109). After this, the control circuit 41 ends the wireless usage status grasping process shown in FIG. 8 and waits until the next execution timing.

<Processing of slave unit HS1>
FIG. 9 is a flowchart for explaining the process of counting the number of outgoing call failures performed by the handset HS1. The process shown in FIG. 9 is a process executed at predetermined timings mainly in the control unit 511 of the base unit BS1 of the slave unit HS1. When the process shown in FIG. 9 is executed, the control unit 511 determines whether or not base unit BS1 has instructed to start counting the number of failed outgoing calls (step S201). In step S201, it is a process of checking whether or not an instruction to count the number of outgoing call failures has been received from base unit BS1 through wireless communication section 513 and TDMA modulation/demodulation section 512.

In the determination process of step S201, when it is determined that the start of the process of counting the number of outgoing call failures OtF is not instructed by the base unit BS1, the process shown in FIG. 9 is ended and the next execution timing is waited. . Assume that in the determination processing in step S201, it is determined that base unit BS1 has instructed to start counting the number of outgoing call failures OtF. In this case, the control unit 511 of the slave unit HS1 controls the counting unit 5111 to transmit a call request from the own unit to the base unit BS1, and counts the number of times when the call fails without receiving a response. Start (step S202).

After that, the control unit 511 determines whether a request for providing the number of outgoing call failures has arrived from the base unit BS1 (step S203). That is, in step S203, the control unit 511 determines whether or not a request for providing the number of outgoing call failures has been received from the base unit BS1 through the wireless communication unit 513 and the TDMA modulation/demodulation unit 512. Assume that in the determination process of step S203, it is determined that the request for providing the number of outgoing call failures has not arrived from base unit BS1. In this case, it continues counting the number of outgoing call failures OtF, repeats the process from step S203, and waits for a request to provide the number of outgoing call failures from base unit BS1.

Assume that in the determination process in step S203, it is determined that a request for providing the number of outgoing call failures has arrived from base unit BS1. In this case, the control unit 511 obtains the number of outgoing call failures counted by the counting unit 5111, and notifies (sends) this to the base unit BS1 through the TDMA modem unit 512 and the wireless communication unit 513 (step S204). After this, the control unit 511 ends the process shown in FIG. 9 and waits for the next execution timing to arrive.

In this way, the base unit BS1 and slave unit HS1 that constitute the cordless telephone device 21 are able to grasp the wireless usage status and notify the main unit 1 of this by working together. Note that if it is sufficient to just know the wireless usage rate Ur, it is not necessary to acquire the number of failed outgoing calls from the handset HS1. However, by being able to understand the call loss rate Clr, it becomes possible to appropriately understand the situation where it is actually becoming difficult to make calls or where it is becoming difficult to make calls.

[Effects of embodiment]
According to the cordless telephone device of the embodiment described above, the base unit BS1 and the slave unit HS1 calculate the wireless usage rate Ur and the call loss rate Clr according to instructions from the main device 1, can be notified. As a result, the main device 1 can appropriately grasp the wireless usage status of the cordless telephone device connected to itself, understand the situation where it is difficult to receive or make calls, and use it. You can do things like notify the person.

[Modified example]
In the above-described embodiment, the base unit BS1 and the slave unit HS1 are controlled under the control of the main device 1 based on the data collection period for the wireless usage status understanding process that is preset in the main device 1. The wireless usage status is now understood. However, it is not limited to this. The execution timing and end timing of the wireless usage status monitoring process are set in the base units of each cordless telephone device 21, 22, and 23, and the base units BS1, BS2, and BS3 execute the wireless usage status monitoring process accordingly. However, the main device 1 may be notified of the result.

Further, although the wireless usage status understanding process has been described as being performed for one hour in the morning and one hour in the afternoon, the process is not limited to this. For example, it is possible to perform the process of understanding the wireless usage status at an appropriate timing and by specifying a period of time, such as by performing the process of understanding the wireless usage status during a time when telephone use is relatively concentrated. I can do it. Therefore, the process of understanding the wireless usage status can also be performed outside business hours, such as at night or early in the morning. In addition, the process of understanding the wireless usage status can be executed at appropriate timings, such as once a day, once every two days, once every three days, once a week, once a month, etc. It is possible.

Further, the main device 1 can notify the user when the wireless usage rate or call loss rate notified from the subordinate cordless telephone devices 21, 22, and 23 exceeds a predetermined certain value. . The notification can be made by emitting a warning sound from a predetermined telephone terminal connected to the main device 1, or by sending a warning e-mail to a predetermined e-mail address. It is also possible to notify the corresponding department of the company performing the maintenance by automatically calling or sending an e-mail.

In addition, when the calculated wireless usage rate and call loss rate in each of the base units BS1, BS2, and BS3 become higher than predetermined values, the cordless telephone devices 21, 22, and 23 notify the user of this. It can also be configured to do so. For example, the control circuit 41 of the base units BS1, BS2, and BS3 can control the LEDs provided in the base units BS1, BS2, and BS3 to light or blink. In addition, control signals are sent from the base units BS1, BS2, and BS3 to the corresponding slave units HS1, HS2, and HS3, and the LEDs of the slave units HS1, HS2, and HS3 are turned on or blinking, and a warning message is displayed on the LCD. You can do it. Further, a warning message or a warning sound can be emitted using the sound emitting means of the child units HS1, HS2, and HS3.

In this way, without going through the main device 1, the base unit BS1 determines whether a warning is necessary based on the wireless usage rate or call loss rate, and uses the functions of the base unit BS1 or the functions of the base unit BS1 and slave unit HS1 to issue a warning. , it is possible to notify the user of the wireless communication status and urge the user to take appropriate measures. Therefore, the present invention can be applied not only to cordless telephone devices that constitute a business phone system, but also to cordless telephone devices that function independently.

Also, the contents of the data stored in the wireless usage status table 411 formed in the control circuit 41 of the base units BS1, BS2, BS3 of the cordless telephone devices 21, 22, 23 are confirmed through the corresponding slave units HS1, HS2, HS3. It can also be configured as follows. Also, the contents of the data stored in the terminal-specific wireless usage status table 14 of the main device 1 are referenced from an external device such as a personal computer for maintenance connected to the main device 1, and the contents are grasped. It is also possible to make it possible.

Further, in the above-described embodiment, the present invention is applied to a DECT standard cordless telephone device, but the present invention is not limited to this. A predetermined communication channel is divided into frames of a predetermined time unit, each of these frames is further divided into a plurality of time slots, and wireless communication is performed between the base unit and the slave unit through the selected time slot of each frame. It is applicable to cordless telephone devices that perform communication.

[others]
As can be seen from the above description of the embodiment, the detection means in the claim is realized mainly by the RSSI detection unit 4422 of the base unit BS1 of the embodiment, and the function of the usage rate calculation means in the claim is realized by the parent unit BS1. This is realized by the calculation processing unit 412 of the machine BS1. Further, the function of the output means in the claims is realized by the control signal processing section 422 and the division/multiplexing processing section 421 of the base unit BS1.

Further, the function of the base unit side counting means in the claims is realized by the counting unit 413 of the base unit BS1, and the function of the acquisition unit is realized by the wireless communication unit 443, TDMA modulation/demodulation unit 442, and control unit 441 of the base unit BS1. I am working hard to make it happen. Further, the function of the call loss rate calculation means in the claims is realized by the calculation processing unit 412 of the base unit BS1. Further, the function of the slave unit side counting means in the claims is realized by the counting unit 5111 of the slave unit HS1 of the embodiment, and the function of the providing means is realized by the control unit 511 of the slave unit HS1, the TDMA modem unit 512, the wireless communication Department 513 collaborates to realize this.

1... Main device, 12... Control circuit, 14... Wireless usage status table by terminal, 21, 22, 23... Cordless telephone device, BS1, BS2, BS3... Base unit, HS1, HS2, HS3... Slave unit, 41... Control Circuit, 411...Radio usage status table, 412...Calculation processing unit, 413...Counting unit, 42...Line LSI unit, 43...Synchronization signal generation circuit, 44...Wireless communication circuit, 441...Control unit, 442...TDMA modulation/demodulation unit, 4422...RSSI detection section, 443...Wireless communication section, 51...Wireless communication circuit, 52...Control circuit, 53...Codec circuit, 511...Control section, 5111...Counting section, 512...TDMA modulation/demodulation section, 513...Wireless communication section

Claims (4)

A predetermined communication channel is divided into frames of a predetermined time unit, each of the frames is divided into a plurality of time slots, and wireless communication is performed between a base unit and a slave unit through the selected time slots for each frame. A cordless telephone device that performs
The parent device is
detection means for detecting the usage status of each of the time slots other than those used by the own device in the frame of the communication channel during a predetermined period;
usage rate calculation means for calculating a wireless usage rate of the communication channel based on the detection result of the detection means;
output means for outputting the wireless usage rate calculated by the usage rate calculation means ;
Base device-side counting means for counting the number of successful incoming calls, the number of failed incoming calls, and the number of successful outgoing calls;
acquisition means for acquiring the number of outgoing call failures from the handset;
A call loss rate is determined from the number of successful incoming calls, the number of failed incoming calls, the number of successful outgoing calls, and the number of failed outgoing calls from the handset acquired through the acquisition means. a call loss rate calculation means for calculating the
Equipped with
The output means of the base unit is capable of outputting the call loss rate calculated by the call loss rate calculation means in addition to the wireless usage rate,
The slave device is
handset-side counting means for counting the number of failed outgoing calls during the predetermined period;
providing means for providing the base unit with the number of outgoing call failures counted by the slave unit side counting unit;
A cordless telephone device comprising: The cordless telephone device according to claim 1 ,
The base unit is connected to a plurality of telephone terminals to accommodate them, is connected to one or more outside lines, and is connected to a telephone control device that performs call control of the outside lines and extension lines. ,
A cordless telephone device, wherein the output means of the base device is capable of outputting identification information of the base device to the telephone control device. A cordless telephone device that divides a predetermined communication channel into frames of a predetermined time unit, divides each frame into a plurality of time slots, and performs wireless communication between a base unit and a slave unit through the selected time slots. The parent device of
detection means for detecting the usage status of each of the time slots other than those used by the own device in the frame of the communication channel during a predetermined period;
a usage rate calculation unit that calculates a wireless usage rate of the communication channel based on a detection result of the detection unit; and an output unit that outputs the wireless usage rate calculated by the usage rate calculation unit ;
Base device-side counting means for counting the number of successful incoming calls, the number of failed incoming calls, and the number of successful outgoing calls;
acquisition means for acquiring the number of outgoing call failures from the handset;
A call loss rate is determined from the number of successful incoming calls, the number of failed incoming calls, the number of successful outgoing calls, and the number of failed outgoing calls from the handset acquired through the acquisition means. a call loss rate calculation means for calculating the
Equipped with
The output means of the base unit is capable of outputting the call loss rate calculated by the call loss rate calculation means in addition to the wireless usage rate.
A base unit of a cordless telephone device characterized by: A cordless telephone device that divides a predetermined communication channel into frames of a predetermined time unit, divides each frame into a plurality of time slots, and performs wireless communication between a base unit and a slave unit through the selected time slots. The slave unit of
The master device includes a detection means for detecting the use status of each of the time slots other than the one used by the base device in the frame of the communication channel during a predetermined period, and a detection means for detecting the use status of each of the time slots other than the time slots used by the base device. a usage rate calculation means for calculating a wireless usage rate of a channel; a base unit-side counting means for counting the number of successful incoming calls, the number of failed incoming calls, and the number of successful outgoing calls; the number of successful incoming calls, the number of failed incoming calls, the number of successful outgoing calls counted by the base unit side counting means, and the outgoing calls from the handset acquired through the acquiring unit; A call loss rate calculation means for calculating a call loss rate from the number of call failures;
and output means for outputting the wireless usage rate calculated by the usage rate calculation means and the call loss rate,
handset-side counting means for counting the number of failed outgoing calls during the predetermined period;
A handset of a cordless telephone device, comprising: providing means for providing the number of outgoing call failures counted by the handset-side counting means to the base phone.

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