JP2018117207A - Telephone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow for acquisition instruction or movement instruction of a slot or a channel for use in communication, by predicting occurrence of radio wave interference for signals transmitted and received between the master unit and the slave unit of a cordless telephone set.SOLUTION: Scan data from each master unit is stored and held in the scan data section 15B of a main device 1 in time series order for each master unit. Use slot data from each master unit is stored and held in the use slot data section 15A of the main device 1 in time series order for each master unit. A control circuit 12 of the main device 1 predicts a slot having high possibility of being affected by radio wave interference, by using the data accumulated in the scan data section 15B and the use slot data section 15A, and instructs a slot to be acquired by the master unit or a slot becoming a movement destination on the basis thereof.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a telephone system including a digital cordless telephone device to which, for example, a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) system is applied.

  In Japan, the digital cordless telephone standard T101 was established in 2011 by the Association of Radio Industries and Businesses (ARIB), which includes the technical content of the DECT (Digital Enhanced Cordless Telecommunication) standard. . A DECT standard cordless telephone apparatus is also used in a business phone system. The business phone system is a business phone system constructed in a corporate office or the like by connecting a plurality of telephones to a host device such as a main device that accommodates one or more telephone lines.

  In the DECT standard for digital cordless telephones, the communication method for transmission from the parent device to the child device is a time division duplex method using the time division multiplexing method, and transmission from the child device to the parent device is performed. In this case, it is determined that the communication method is a time division duplex method using a time division multiple access method, that the frequency uses a 1.9 GHz band, and that the number of channels is a maximum of five channels.

  In the DECT standard, one frame in each channel Ch1 to Ch5 of encoded data is composed of 24 slots as shown in FIG. 15, and 12 slots S0 to S11 of the first half frame are Are used for the downlink from the parent device to the child device, and the 12 slots S12 to S23 of the latter half frame are used for the uplink from the child device to the parent device. Each slot has a configuration in which an A field for transmitting control data, a B field for transmitting audio data, and the like are provided.

  In the cordless telephone device of the DECT standard, a slot called a dummy bearer used for wireless communication is acquired in each frame of a predetermined channel in order to perform wireless communication between the parent device and the child device. And, using the dummy bearer that is the slot acquired in each frame between the master unit and the slave unit for sending and receiving various commands such as calling from the slave unit and calling the cordless telephone device from the main unit according to the incoming call Do. A dummy bearer, which is a slot for transmitting and receiving various commands, is configured to always use the same slot of each frame of the same channel as long as it does not suffer from radio interference exceeding a threshold.

  On the other hand, after the transition from the standby state to the call state, an error occurs in the call data due to the interference wave of a PHS telephone or the like used by a nearby third party, so that the call quality (sound quality) deteriorates and the channel or frame used There may be a problem that the slot of the user must be changed. In such a case, for example, the invention described in Patent Document 1 described later can be used.

  The invention described in Patent Document 1 relates to control on the DECT cordless telephone apparatus side in an environment where a DECT cordless telephone and a PHS (Personal handy phone system) telephone are used. Specifically, it is determined whether there is interference due to a signal transmitted from a fixed station of PHS, and when it is determined that there is interference, the frequency band and slot timing to be used are set so as to avoid the interference It is to do.

JP 2011-77985 A

  By the way, in the case of a business phone system constructed by connecting a plurality of DECT-type cordless telephone devices to the main device, the cordless telephone devices connected to the main device are synchronized with each other, and it is not possible to deviate from the slot width. Absent. For this reason, the radio waves transmitted and received between the base unit and the slave unit of the cordless telephone apparatus connected to the same main unit do not have a possibility of causing interference with each other, and therefore must be excluded from the countermeasures against radio wave interference. For example, when the radio wave used by another system such as PHS is close to the radio wave used by the cordless telephone device of the business phone system, it is necessary to avoid radio wave interference.

  In addition, there is a device such as PHS that releases a slot after communication (call) and reacquires the slot during communication. For this reason, it is not sufficient to take appropriate measures to move to a safe slot when in a standby state. After determining whether the source of a signal that may be subject to radio wave interference is a terminal that constitutes the same system connected to the same main device, there is a high possibility that interference will occur due to radio waves transmitted from terminals of other systems It is necessary to properly predict the slot and give instructions for slot assignment and movement.

  In view of the above, the present invention appropriately predicts the occurrence of radio wave interference with signals transmitted and received between the base unit and the handset of the cordless telephone device, and appropriately issues slot and channel acquisition instructions and movement instructions. The aim is to be able to do it.

In order to solve the above-mentioned problem, the telephone system according to the first aspect of the present invention provides:
A plurality of cordless telephone devices composed of a parent device and a child device are connected to the host device, and a unit communication period is set to a plurality of slots in the selected communication channel between the parent device and the child device. In each of the communication from the parent device to the child device and the communication from the child device to the parent device, at least one slot is used for TDMA (Time Division Multiple Access) / TDD (Time Division Duplex). In a telephone system that performs wireless communication using the time division duplex method.
Each of the master units
Detecting means for receiving a signal of a channel used for communication with a slave at every predetermined timing, and detecting the presence or absence of signals in the plurality of slots in the unit communication period;
First transmission means for transmitting scan data including identification information of the own device and information indicating presence / absence of a signal for each of the plurality of slots detected by the detection means, to the host device;
Second transmission means for transmitting use slot data including identification information of the own device and information indicating the use channel and the use slot of the own device to the higher-order device at each predetermined timing;
Instruction information receiving means for receiving instruction information from the host device;
Control means for controlling to select a slot to be used for communication with the slave unit based on the instruction information received through the receiving means, and
The host device is
First receiving means for receiving the scan data from the master unit;
Scan data storage means for storing and holding the scan data received through the first receiving means for each of the master units in chronological order;
Second receiving means for receiving the used slot data from the base unit;
Used slot data storage means for storing and holding the used slot data received through the second receiving means for each of the master units in chronological order;
Prediction means for predicting a slot that may be affected by radio wave interference based on the accumulated data of the scan data storage means and the accumulated data of the used slot data storage means;
Instruction information transmitting means for forming instruction information for instructing a slot to be used based on a prediction result by the prediction means and transmitting the instruction information to the parent device.

  According to the telephone system of the first aspect of the present invention, in each of the base units of the cordless telephone apparatus, the presence or absence of a signal is detected for each of a plurality of slots in the unit communication period by the detection means at every predetermined timing. The detection result from the detection unit is transmitted as scan data to the host device through the first transmission unit together with the identification information of the master unit. Further, in each of the master units, at each predetermined timing, the use slot data including the master unit identification information and information indicating the use channel and the use slot of the master unit is transmitted to the host device through the second transmission unit. Sent.

  In the host device, the scan data from each parent device received through the first receiving means is stored and held in the scan data storage means for each parent device in chronological order. Also, the used slot data from each parent device received through the second receiving means is stored and held in the used slot data storage means for each parent device in chronological order. Then, the prediction unit of the host device uses the accumulated data of the scan data storage unit and the used slot data storage unit to predict a slot that is affected by radio wave interference due to radio waves of other systems. Based on the prediction result of the prediction means, the instruction information transmission means forms instruction information for instructing a slot to be used by the parent device, and transmits it to the parent device.

  Thus, it is possible to appropriately designate the slot of the channel used for performing communication between the parent device and the child device from the upper device, avoiding the slot expected to be affected by the radio wave interference. Therefore, communication performed between the parent device and the child device is prevented from being affected by radio wave interference as much as possible, and communication can always be performed appropriately.

  In addition, in this specification, the radio waves of other systems are radio waves other than those emitted by the cordless telephone device connected to the host device, and are the radio waves used by the cordless phone device connected to the host device. Radio waves in the same band as the frequency band. Therefore, for example, radio waves that are not connected to the host device, for example, radio waves that are used in the PHS system or other electronic devices, and that are in the same frequency band as that of the cordless telephone device that is connected to the host device. Becomes radio waves of other systems.

  According to the present invention, it is possible to appropriately predict the occurrence of radio wave interference with respect to a signal transmitted / received between a base unit and a handset of a DECT cordless telephone apparatus, and appropriately issue a slot / channel acquisition instruction or a movement instruction. be able to. Thereby, it is possible to maintain an environment in which appropriate communication can be performed without being affected by radio wave interference between the parent device and the child device.

It is a block diagram for demonstrating the outline | summary of the whole structure of the telephone system of embodiment. It is a block diagram which shows the structural example of the main apparatus which comprises some telephone systems of embodiment. It is a block diagram which shows the structural example of the main | base station of the cordless telephone apparatus which comprises some telephone systems of embodiment. It is a figure for demonstrating use slot data (FIG. 4 (A)) and scan data (FIG. 4 (B)). It is a figure for demonstrating the use slot data part and scan data part which are provided in the data storage part of the main apparatus. It is a block diagram which shows the structural example of the subunit | mobile_unit of the cordless telephone apparatus which comprises some telephone systems of embodiment. It is a figure for demonstrating the prediction of a radio wave interference, and the instruction | indication of an acquisition slot. It is a figure for demonstrating the prediction of a radio wave interference, and the instruction | indication of an acquisition slot. It is a figure for demonstrating the prediction of a radio wave interference, and the instruction | indication of an acquisition slot. It is a figure for demonstrating the prediction of a radio wave interference, and the instruction | indication of an acquisition slot. It is a flowchart for demonstrating the carrier sense process performed with a main | base station. It is a flowchart for demonstrating the inquiry process of the slot performed with a main | base station. It is a flowchart for demonstrating the movement process of the slot according to the instruction | indication from the main unit performed with the main | base station. It is a flowchart for demonstrating the prediction process of the radio wave interference performed with a main apparatus. It is a figure for demonstrating the communication system of DECT specification.

  Hereinafter, an embodiment of a telephone system according to the present invention will be described with reference to the drawings. In the embodiment described below, for example, a case where the present invention is applied to a so-called business phone system configured in an office building will be described as an example.

[Telephone system configuration example]
FIG. 1 is a block diagram showing an example of the overall configuration of a telephone system 10 according to this embodiment. The telephone system 10 is one to which an embodiment of the telephone system of the present invention is applied. In the telephone system 10, a plurality of cordless telephone devices 21, 22,..., 2n (n is an integer of 2 or more. ) Is connected. Each of the cordless telephone devices 21 to 2n includes a base set BS1, BS2,..., BSn as a master unit and a handset HS1, HS2,. Each of the devices BS1 to BSn is wirelessly connected to each of the slave devices HS1 to HSn.

  A plurality of slave units can be wirelessly connected to each of the master units BS1 to BSn. However, in this example, one slave unit is connected to one master unit. It is set as the structure. Although not shown, the extension telephone apparatus connected to the main apparatus 1 is not limited to the cordless telephone apparatuses 21, 22,... it can.

  In this embodiment, the wireless connection between each of the parent devices BS1 to BSn of the cordless telephone devices 21 to 2n and each of the child devices HS1 to HSn conforms to the DECT standard (method) of the above-described digital cordless phone. This is performed by the TDMA / TDD method used.

  The main apparatus 1 is one to which an embodiment of the host apparatus is applied. The main apparatus 1 can accommodate one or a plurality of telephone lines L1 to Lm (m is an integer of 2 or more). Then, the respective parent devices BS1 to BSn of the cordless telephone devices 21 to 2n are connected to the main device 1. In the example of FIG. 1, the parent devices BS1 to BSn and the main device 1 are connected by wire, but may be wireless.

  The main device 1 performs call control and circuit switching control for the plurality of cordless telephone devices 21 to 2n, and other business phone control, and supplies a reference synchronization signal SYNC to each of the plurality of cordless telephone devices 21 to 2n. It has a function. In this example, the reference synchronization signal SYNC is a signal having a period of 130 milliseconds (ms).

  Each of the base units BS1 to BSn of the cordless telephone apparatuses 21 to 2n is synchronized with the reference synchronization signal SYNC from the main apparatus 1, and is one frame (10 milliseconds (ms) which is a unit communication period of the DECT standard digital cordless telephone. )) Period frame synchronization signal is generated, and TDMA / TDD wireless communication using the DECT standard is executed between the slave units HS1 to HSn based on the generated frame synchronization signal. Therefore, all of the plurality of cordless telephone apparatuses 21 to 2n operate in synchronization with the reference synchronization signal SYNC from the main apparatus 1.

  Each of base units BS1 to BSn is an application of one embodiment of a base unit of a cordless telephone device. Each of base units BS1 to BSn generates a frame synchronization signal based on reference synchronization signal SYNC, and based on the generated frame synchronization signal, a plurality of one frame periods are transmitted to slave units HS1 to HSn. Control is performed so that wireless communication is performed using one of the slots.

  Each of base units BS1 to BSn includes a carrier sense unit 4422 as shown in FIG. For example, every 1.28 seconds (128 frames), the carrier sense unit 4422 receives a signal for one frame through a communication channel used for communication with the slave unit, and a signal (radio wave) exists in each slot. A carrier sense process (scan process) is performed to check whether to perform the process. This carrier sense process is performed in the so-called background. That is, the calibration process is performed as a process different from the process related to the normal communication process.

  Each of base units BS1 to BSn includes notification processing unit 412, and includes scan data including its own identification ID and information indicating the presence / absence of a signal for each slot obtained as a result of processing by carrier sense unit 4422. And notify (send) this to the main apparatus 1. Further, the notification processing unit 412 uses information indicating the slot used for communication with the slave unit every 1.28 seconds (128 frames) which is the execution timing of the carrier sense process, and identification information of the own unit. Used slot data is formed and notified (sent) to the main apparatus 1.

  As shown in FIG. 1, the main apparatus 1 includes a control circuit 12 and a data storage unit 15. Then, the control circuit 12 of the main apparatus 1 stores the scan data notified from each of the parent devices BS1 to BSn in the scan data unit 15B of the data storage unit 15 in chronological order (notified order). Similarly, the control circuit 12 of the main device 1 stores the used slot data notified from each of the parent devices BS1 to BSn in the used slot data unit 15A of the data storage unit 15 in chronological order (notified order). To do.

  The control circuit 12 of the main device 1 predicts a slot that may be subject to radio wave interference for each cordless telephone device, using the scan data of the scan data unit 15B and the use slot data of the use slot data unit 15A. Then, the control circuit 12 of the main device 1 instructs a slot having a low possibility of receiving radio wave interference as a slot to be acquired in response to the inquiry from the parent devices BS1 to BSn. In addition, the control circuit 12 of the main device 1 moves the slot with respect to the parent device when there is a parent device in which each of the parent devices BS1 to BSn is likely to receive radio wave interference. Instruct.

  In each of the base units BS1 to BSn, the slot control unit 413 functions, and in response to an instruction from the main device 1, the slot used for communication with the slave unit is acquired, or acquired and used. Move one slot to another. Thus, each of base units BS1 to BSn can communicate with the slave unit using a slot that is unlikely to be affected by radio wave interference.

  As described above, each of the parent devices BS1 to BSn cooperates with the main device 1 to perform wireless communication with the child device at all times using a slot that is unlikely to receive radio wave interference. It can be carried out. Therefore, at the time of standby, each of slave units HS1 to HSn can appropriately receive control from main apparatus 1 through corresponding master units BS1 to BSn. Further, even during a call, the communication quality can be prevented from deteriorating between the corresponding parent devices BS1 to BSn and the child devices HS1 to HSn.

  Next, a configuration example of the main device 1 constituting the telephone system of this embodiment and a configuration example of each of the parent devices BS1 to BSn and the child devices HS1 to HSn of the cordless telephone devices 21 to 2n will be described.

[Configuration Example of Main Device 1]
FIG. 2 is a block diagram illustrating a configuration example of the main apparatus 1. As shown in FIG. 2, the main apparatus 1 includes a line interface 11 to which the telephone lines L1 to Lm are connected, a control circuit 12 for controlling the entire main apparatus 1 and a line LSI ( Large Scale Integrated Circuit) unit 13, reference oscillator 14, and data storage unit 15.

  The line interface 11 supplies voice signals (received voice signals) from the lines L1 to Lm to the line LSI unit 13 under the control of the control circuit 12, and control signals such as call control signals from the lines are supplied to the control circuit. 12 is supplied. Further, the line interface 11 is controlled by the control circuit 12, and the voice signal (transmission voice signal) from the line LSI unit 13 is transmitted to the other party through the lines L1 to Lm, and the call control signal from the control circuit 12 and the like. The control signal is also transmitted to the other party through the lines L1 to Lm.

  The line LSI unit 13 includes n extension processing circuits 131, 132,..., 13n and a timing signal generation unit 130 corresponding to the n extension telephone apparatuses. The timing signal generator 130 generates a transmission clock signal CK and a multiplexing / division timing signal TM from a reference clock signal from a high-accuracy reference oscillator 14 using a crystal resonator, and performs n extension processing. This is supplied to the circuits 131 to 13n.

  The n extension processing circuits 131 to 13n have exactly the same configuration, and are respectively an audio signal processing unit 31, a control signal processing unit 32, a synchronization signal processing unit 33, and a multiplexing / division processing unit. 34.

  The audio signal processing unit 31 is connected to the line interface 11 and is also connected to the multiplexing / division processing unit 34. The voice signal from the line interface 11 and the transmission from the multiplexing / division processing unit 34 are transmitted. It is a processing circuit for a speech signal. The audio signal processing unit 31 is supplied with the transmission clock signal CK from the timing signal generation unit 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. It is a processing circuit for control signals such as control signals (both control signals from the main apparatus 1 to the cordless telephone apparatus and control signals from the cordless telephone apparatus to the main apparatus 1). The control signal processing unit 32 is also supplied with the transmission clock signal CK from the timing signal generation unit 130.

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

  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 apparatuses 21 to 2n. The Based on the timing signal TM from the timing signal generation unit 130, the multiplexing / division processing unit 34, the audio signal from the audio signal processing unit 31, the control signal from the control signal processing unit 32, and the synchronization signal The reference synchronization signal SYNC from the processing unit 33 is multiplexed (time division multiplexing) to generate a multiplexed signal, and the generated multiplexed signal is supplied to each of the parent devices BS1 to BSn. Further, the multiplexing / division processing unit 34 divides the multiplexed signal from each of the parent devices BS1 to BSn into the audio signal and the control signal based on the timing signal TM from the timing signal generating unit 130, The audio signal is supplied to the audio signal processing unit 31, and the control signal is supplied to the control signal processing unit 32.

  Although not shown, the main apparatus 1 is also connected to an address management unit. The address management unit stores and manages the correspondence between the extension numbers of the cordless telephone apparatuses 21 to 2n connected to the main apparatus 1 and the extension processing circuits 131 to 13n. In the telephone system 10 of this embodiment, when any of the cordless telephone devices 21 to 2n is connected to the main device 1, the parent device of the cordless telephone device sends a connection request to the main device 1.

  The main device 1 detects which of the extension processing circuits 131 to 13n is the extension processing circuit that has received the connection request from the master unit of the cordless phone device as a control signal, so that the cordless phone device is connected. The detected extension processing circuit is detected. Then, the control circuit 12 associates the extension number set by the installer or the administrator or the extension number automatically set with the identification information of the extension processing circuit to which the cordless telephone device is connected. Register with the address manager.

  Based on the information of the address management unit, it is possible to appropriately grasp the operating status of the cordless telephone device connected to the main device 1, and appropriately control each of the cordless telephone devices connected to the main device 1. it can.

  Further, as shown in FIG. 2, a data storage unit 15 is connected to the control circuit 12. The data storage unit 15 includes a recording medium having a large storage capacity such as a hard disk. The control circuit 12 can record data in the data storage unit 15, read data from the data storage unit 15, and erase data recorded in the data storage unit 15.

  The data storage unit 15 is provided with a use slot data unit 15A and a scan data unit 15B as shown in FIG. Using the use slot data of the use slot data unit 15A and the scan data of the scan data unit 15B, the control circuit 12 may be subject to interference (radio wave interference) due to radio waves of other systems for each cordless telephone device. Predict the slot. Then, the control circuit 12 of the main apparatus 1 instructs the base units BS1 to BSn about the slot to be acquired or instructs the movement of the slot.

  Details of the used slot data portion 15A and the used slot data stored therein, and details of the scan data portion 15B and the scan data stored therein will be described later.

[Configuration example of cordless telephone device]
Each of the parent devices BS1 to BSn and the child devices HS1 to HSn of the plurality of cordless telephone devices 21 to 2n has the same configuration. Therefore, in the following description, a configuration example of the parent device and the child device will be described taking the case of the parent device BS1 and the child device HS1 of the cordless telephone device 21 as an example.

<Example configuration of main unit>
FIG. 3 is a block diagram illustrating a configuration example of the base unit BS1. As shown in FIG. 3, base unit BS1 includes a control circuit 41 for controlling the entire base unit BS1, a line LSI unit 42, a synchronization signal generation circuit 43, a radio communication circuit 44, an oscillator 45, and 46.

  The control circuit 41 is configured by mounting a computer. The control circuit 41 has a function of performing control such as call control in the base unit BS1. Further, as shown in FIG. 3, the control circuit 41 includes a memory 411, a notification processing unit 412, and a slot control unit 413. The memory 411 stores and holds information indicating a slot used and a result of carrier sense processing supplied from a wireless communication circuit 44 described later every 1.28 seconds.

  The notification processing unit 412 forms use slot data based on the information indicating the use slot stored and held in the memory 411 and transmits the use slot data to the main apparatus 1. Further, the notification processing unit 412 forms scan data based on information indicating the result of carrier sense processing stored and held in the memory 411 and transmits the scan data to the main apparatus 1. Details of the used slot data and the scan data will be described later.

  The slot control unit 413 realizes a function of instructing the wireless communication circuit 44 which slot to acquire in response to the slot acquisition instruction transmitted from the main device 1. In addition, the slot control unit 413 realizes a function of instructing the wireless communication circuit 44 of a destination slot in response to a slot movement instruction transmitted from the main device 1.

  In the standby state (idle state), the slot control unit 413 specifies an appropriate slot as a dummy bearer, and transmits various control information including a synchronization signal and the like to the slave unit through this dummy bearer. It also has a function to control. Here, the standby state is a state in which power is supplied to base unit BS1 so that it can operate upon receipt of an incoming or outgoing call.

  Further, the slot control unit 413 identifies an appropriate slot as a traffic bearer when an incoming call occurs or a call is made from the slave unit, and the master unit and the slave unit are identified through the traffic bearer. It also has a function to control so that they can communicate with each other. Through the traffic bearer, in addition to various control information including a synchronization signal, voice information is also transmitted after the call line is connected to the other party of the call. When a call is received, an incoming call notification is also transmitted from the parent device to the child device through the traffic bearer.

  In this case, the slot control unit 413 specifies a slot used for communication with the slave unit. Specifically, the slot control unit 413 specifies a slot to be used based on the detection result in the carrier sense unit 4422 provided in the TDMA modulation / demodulation unit 442 of the wireless communication circuit 44 described later, a request from the slave unit, or the like. be able to.

  The line LSI unit 42 is a circuit for exchanging audio signals, control signals, and synchronization signals with the main apparatus 1, and includes a division / multiplexing processing unit 421, a control signal processing unit 422, and an audio signal. The processing unit 423 includes a synchronization signal detection unit 424 and a PLL (Phase locked Loop) unit 425.

  The PLL unit 425 is supplied with the oscillation signal of the reference frequency from the oscillator 45 and the multiplexed signal from the main device 1. In this example, the frequency of the oscillation signal of the oscillator 45 is, for example, 2048 MHz (0.488 nanoseconds (ns)). The PLL unit 425 extracts the component of the clock signal CK from the timing signal generation unit of the main device 1 from the multiplexed signal from the main device 1 by so-called self-clocking, and the extracted clock signal CK component and the oscillator 45 The system clock signal SCK of the base unit BS1 synchronized with the clock signal CK component is generated from the oscillation signal of the oscillator 45 based on the comparison result.

  Then, the PLL unit 425 sends the generated system clock signal SCK to each of the division / multiplexing processing unit 421, the control signal processing unit 422, the audio signal processing unit 423, and the synchronization signal detection unit 424 as a signal processing clock signal. At the same time, it is supplied to the synchronization signal generation circuit 43.

  The division / multiplexing processing unit 421 is connected to the main apparatus 1 and is also connected to the control signal processing unit 422, the audio signal processing unit 423, and the synchronization signal detection unit 424. Then, the division / multiplexing processing unit 421 divides the control signal, the audio signal, and the reference synchronization signal SYNC from the multiplexed signal from the main device 1, and the control signal is sent to the control signal processing unit 422, and the audio signal is sent to the audio signal. The reference synchronization signal SYNC is supplied to the signal processing unit 423 and the synchronization signal detection unit 424, respectively. Further, the division / multiplexing processing unit 421 generates a multiplexed signal by multiplexing the control signal from the control signal processing unit 422 and the audio signal from the audio signal processing unit 423, and the generated multiplexed signal Is supplied to the main apparatus 1.

  The control signal processing unit 422 is connected to the control signal input / output terminal of the control circuit 41, and is also connected to the division / multiplexing processing unit 421. This is a processing circuit for control signals such as control signals (both control signals from the main apparatus 1 to the cordless telephone apparatus 21 and control signals from the cordless telephone apparatus 21 to the main apparatus 1).

  The audio signal processing unit 423 is connected to the wireless communication circuit 44 and is also connected to the division / multiplexing processing unit 421, and the received voice signal received from the handset HS 1 from the wireless communication circuit 44 and the divided / multiplexed 6 is a processing circuit for a transmission voice signal from the multiplexing processing unit 421;

  The synchronization signal detection unit 424 receives the reference synchronization signal SYNC from the division / multiplexing processing unit 421, detects a predetermined synchronization signal pattern included in the reference synchronization signal SYNC, and as a signal at the time of detection, A reference synchronization pulse PS having the same period (130 ms) as the reference synchronization signal SYNC is generated in synchronization with the reference synchronization signal SYNC. Then, the synchronization signal detection unit 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 unit 432. The counter 431 is supplied with the reference synchronization pulse PS having a period of 130 ms from the synchronization signal detection unit 424 of the line LSI unit 42 to the preset terminal and the system clock signal SCK from the PLL unit 425 as a count input. . Then, the output count value CNT of the counter 431 is supplied to the synchronization signal generator 432.

  The synchronization signal generation unit 432 generates a synchronization signal FL having a DECT standard frame period (10 ms) 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 unit 432 to the wireless communication circuit 44.

  Next, the wireless communication circuit 44 will be described. The wireless communication circuit 44 includes a control unit 441, a TDMA modulation / demodulation unit 442, and a wireless communication unit 443. The wireless communication unit 443 is a circuit unit for performing wireless communication with the child device HS1.

  The control unit 441 is connected to the TDMA modulation / demodulation unit 442 and the wireless communication unit 443 and also connected to the control circuit 41. The control unit 441 controls the overall operation of the wireless communication circuit 44 according to the control of the control circuit 41, for example. The control unit 441 supplies a control signal based on the control signal obtained from the control circuit 41 to the TDMA modulation / demodulation unit 442.

  The TDMA modulation / demodulation unit 442 is connected to the control unit 441 and the audio signal processing unit 423 of the line LSI unit 42 and is also connected to the wireless communication unit 443, and from the control signal from the control unit 441 and the audio signal processing unit 423. Is modulated in order to transmit the audio signal to the slave unit HS1. The signal modulated by the TDMA modulation / demodulation unit 442 is transmitted to the slave unit HS1 through the wireless communication unit 443.

  The TDMA modulation / demodulation unit 442 demodulates the audio signal and the control signal from the received signal from the slave unit HS1 received by the wireless communication unit 443, and supplies the demodulated audio signal to the audio signal processing unit 423 for demodulation. The control signal is supplied to the control unit 441.

  The TDMA modulation / demodulation unit 442 includes a PLL unit 4421 for generating a clock. The PLL unit 4421 is supplied with the oscillation signal from the oscillator 46 and the frame synchronization signal FL from the synchronization signal generation circuit 43. The PLL unit 4421 compares the phase of the frame synchronization signal FL from the synchronization signal generation circuit 43 with the oscillation signal from the oscillator 46, and synchronizes the frame synchronization signal FL from the oscillation signal of the oscillator 46 based on the comparison result. A timing signal and a clock signal are generated.

  The TDMA modulation / demodulation unit 442 uses the timing signal and clock signal synchronized with the frame synchronization signal FL to generate a transmission signal to the slave unit HS1 in a period corresponding to a slot in the downlink that can be allocated and used. The received signal from the slave unit HS1 is processed using a slot in the link.

  The carrier sense unit 4422 receives the reception signal from the wireless communication unit 443 and detects the slot usage status in the frame of the channel used by the own device at a predetermined timing. In this embodiment, the carrier sense unit 4422 uses the timing signal and clock signal from the PLL unit 4421 to detect which slot is used in the channel frame used by the own device. Thereby, an empty slot can also be specified. The detection result is notified to the slot control unit 413 of the control circuit 41 through the control unit 441. The carrier sense unit 4422 can also detect a noisy slot.

  In base unit BS1 having such a configuration, as described above, use slot data and scanning data are generated at a cycle of 1.28 seconds and transmitted to main apparatus 1. That is, the carrier sense unit 4422 performs carrier sense processing in the background with a period of 1.28 seconds, and notifies the control circuit 41 of information indicating the result of the carrier sense processing through the control unit 441. At this time, the control unit 441 uses the downlink slot No. used for communication with the slave unit in its own unit. And uplink slot No. To the control circuit 41 as information indicating the slot used. The control circuit 41 temporarily stores this information in the memory 411.

  Then, the notification processing unit 412 of the control circuit 41 generates use slot data and scan data based on the information temporarily stored in the memory 411 and transmits them to the main apparatus 1. FIG. 4 is a diagram for explaining use slot data (FIG. 4A) and scan data (FIG. 4B).

  First, used slot data will be described. As shown in FIG. 4A, the used slot data includes “sequence number”, “identification ID”, “channel”, “downlink slot number”, and “uplink slot number”. “Sequence No.” is information that has an initial value of “0 (zero)” and is incremented by “1” each time used slot data is generated in the master unit and is added to the used slot data.

  Therefore, “Sequence No.” is a serial number assigned to the used slot data in the order generated, such as 1, 2, 3,. “Sequence No.” is initialized to “0 (zero)” when used slot data is generated for a predetermined time or a predetermined number of times, and is assigned again in order from “1”. The

  The “identification ID” is identification information of the cordless telephone device connected to the main device 1. “Channel” is identification information of a wireless channel used for wireless communication between the parent device and the child device of the cordless telephone device when the used slot data is generated. “Downlink slot No.” is “Downlink slot No.” of information indicating the slot used, which is temporarily stored in the memory 411. Also. The “uplink slot No.” is “uplink slot No.” of information indicating the used slot temporarily stored in the memory 411.

  Next, scan data will be described. As shown in FIG. 4B, the scan data includes “sequence No.”, “identification ID”, “channel”, and “slot table section”. “Sequence No.” is the same as “Sequence No.” of the used slot data described with reference to FIG. 4A, and “0 (zero)” is set as an initial value, and each time scan data is generated. This is a serial number incremented by one. In addition, the numbers from 1 to a predetermined maximum value are repeatedly given, similarly to the “sequence No.” of the slot data used.

  The “identification ID” and “channel” are the same as the “identification ID” and “channel” of the used slot data shown in FIG. That is, the “identification ID” is identification information of the cordless telephone device connected to the main device 1. “Channel” is identification information of a wireless channel used for wireless communication between the parent device and the child device of the cordless telephone device when the used slot data is generated.

  The “slot table section” is a table section formed of, for example, a 1-bit flag area corresponding to each of the 24 slots from slot S0 to slot S23 constituting one frame. The initial value of each flag area in this table portion is “0 (zero)”. That is, in the initial state, each flag area is initialized with “0 (zero)”. Then, based on the information indicating the result of the carrier sense process temporarily stored in the memory 411, the flag area corresponding to the slot in which it is confirmed that there is a high level signal that may cause radio wave interference. The value “1” is written. The flag area corresponding to the slot that is not so is left with the value “0”.

[Used slot data section and scan data section of main device 1]
4A is stored in the used slot data section 15A of the data storage section 15 of the main apparatus 1 shown in FIG. 1 and FIG. 2, and the used slot data shown in FIG. The scan data shown in B) is stored. Here, regarding the details of the used slot data unit 15A and the scan data unit 15B of the data storage unit 15 of the main apparatus 1 shown in FIGS. 1 and 2, the relationship between the used slot data and the scan data described with reference to FIG. Will be explained.

  FIG. 5 is a diagram for explaining the used slot data unit 15A and the scan data unit 15B provided in the data storage unit 15 of the main apparatus 1. As shown in FIG. 5A, the used slot data section 15A is provided with used slot data files 15A1, 15A2,... For each cordless telephone device 21 to 2n connected to the main device 1. That is, in FIG. 5A, the telephone device 21 use slot data file 15A1 is for the cordless telephone device 21, and the telephone device 22 use slot data file 15A2 is for the cordless telephone device 22. .

  The used slot data from the base units BS1 to BSn of the cordless telephone apparatuses 21 to 2n are stored in the used slot data files 15A1, 15A2,... Corresponding to the respective cordless telephone apparatuses. Then, when use slot data is generated for a predetermined time or a predetermined number in base units BS1 to BSn, use slot data having the same “sequence No.” is generated. For this reason, in the main apparatus 1, when the use slot data of the same “sequence No.” exists in the use slot data files 15A1, 15A2,. Replaced with used slot data.

  Further, in the use slot data files 15A1, 15A2,... Of each cordless telephone device, a pointer is attached to the latest use slot data recorded. As a result, in the use slot data files 15A1, 15A2,..., The sequence number “1” to the last use slot data recorded until “Sequence No.” is accumulated in chronological order until a predetermined number of use slot data is accumulated. It becomes the arranged data.

  It is assumed that a predetermined number of used slot data is stored in the used slot data files 15A1, 15A2,. In this case, the use slot data next to the use slot data to which the pointer is attached becomes the oldest use slot data (first), and the use slot data to which the pointer is attached becomes the latest use slot data (end). . In the used slot data files 15A1, 15A2,..., Used slot data from the oldest used slot data (top) to the latest used slot data (end) is arranged and stored in time series. As described above, each of the used slot data files 15A1, 15A2,... Has the same configuration as a so-called ring buffer.

  In each of the parent devices BS1 to BSn, the use slot data is generated at the same timing every 1.28 seconds based on the reference synchronization signal from the main device 1 as described above. In this manner, the used slot data generated in each of the parent devices BS1 to BSn is transmitted to the main apparatus 1 and stored in the used slot data files 15A1, 15A2,. For this reason, in the main device 1, if the data of each used slot data file 15A1, 15A2,... In the used slot data section 15A is confirmed, at which timing each 1.28 seconds, each cordless telephone device has which channel. It is possible to know which slot was used for wireless communication.

  As shown in FIG. 5B, the scan data unit 15B of the data storage unit 15 is provided with scan data files 15B1, 15B2,... For the cordless telephone devices 21 to 2n connected to the main device 1. . That is, in FIG. 5B, the scan data file 15B1 for the telephone device 21 is for the cordless telephone device 21, and the scan data file 15B2 for the telephone device 22 is for the cordless telephone device 22.

  In the scan data files 15B1, 15B2,... For each cordless telephone device, the scan data generated and transmitted in each of the parent devices BS1 to BSn every 1.28 seconds is transmitted for each cordless telephone device. Therefore, they are stored in chronological order. That is, each of the scan data files 15B1, 15B2,... For each cordless telephone device is the same as the case of the use slot data files 15A1, 15A2,... For each cordless telephone device described with reference to FIG. In addition, for each cordless telephone device, scan data for a predetermined period is stored and held in chronological order. Each of the scan data files 15B1, 15B2,... For each cordless telephone device has a configuration similar to a so-called ring buffer.

<Example configuration of slave unit; FIG. 6>
FIG. 6 is a block diagram illustrating a configuration example of the slave unit HS1. As shown in FIG. 6, 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 uses a general-purpose wireless communication LSI for handset for performing DECT standard wireless communication. The wireless communication circuit 51 includes a control unit 511, a TDMA modulation / demodulation unit 512, and a wireless communication unit 513. The wireless communication unit 513 is a circuit unit for performing wireless communication with the parent device BS1.

  The control unit 511 is connected to the TDMA modulation / demodulation unit 512 and the wireless communication unit 513 and is also connected to the control circuit 52. The control unit 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 unit 512.

  The TDMA modulation / demodulation unit 512 is connected to the control unit 511 and the wireless communication unit 513 and is also connected to the codec circuit 53, and transmits the control signal from the control unit 511 and the audio signal from the codec circuit 53 to the base unit BS1. To do modulation. The signal modulated by TDMA modulation / demodulation unit 512 is transmitted to base unit BS1 through radio communication unit 513.

  The TDMA modulation / demodulation unit 512 demodulates the audio signal and the control signal from the received signal from the base unit BS1 received by the wireless communication unit 513, supplies the demodulated audio signal to the codec circuit 53, and demodulates the control signal. Is supplied to the control unit 511.

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

  The codec circuit 53 decodes the audio signal demodulated by the TDMA modulation / demodulation unit 512, converts the audio signal into an analog audio signal, supplies the analog audio signal to the speaker 56, and emits the received audio as received audio. The codec circuit 53 encodes the analog audio signal collected by the microphone 55 and supplies the encoded analog audio signal to the TDMA modulation / demodulation unit 512.

  The control circuit 52 transmits a call control signal at the time of calling from the child device HS1 to the parent device BS1 through the wireless communication circuit 51, and also performs call control at the time of incoming from the parent device BS1. When a signal is received, processing such as emitting a ringtone from the speaker 56 is performed.

  Although not shown, the TDMA modulation / demodulation unit 512 is provided with a carrier sense unit. When a call is made by making a call or responding to an incoming call, the carrier sense unit of the child device HS1 also performs carrier sense processing to detect an empty slot, and traffic to the parent device through the control unit 511 The candidate slot for the bearer is notified. As a result, if the result of the carrier sense in the carrier sense unit 4422 of the parent device is coincident, the parent device BS1 can acquire a slot that is a candidate from the child device as a traffic bearer and start a call. .

  The above description is for the base unit BS1 and the handset HS1 of the cordless telephone device 21, but as described above, the base units BS2 to BSn and handset HS2 to HSn of the other cordless phone devices 22 to 2n. Have the same configuration.

[Slot acquisition control and movement control by main device 1]
The main device 1 having the above-described configuration predicts a slot that is highly likely to cause radio wave interference based on the used slot data of the used slot data unit 15A of the data storage unit 15 and the scan data of the scan data unit 15B. Based on the prediction result, the main device 1 avoids slots that are highly likely to cause radio wave interference, and acquires the slots so that the master devices BS1 to BSn of the cordless telephone devices 21 to 2n connected to the main device 1 Can be controlled. In addition, when it is determined from the prediction result that the cordless telephone apparatus connected to the main apparatus 1 uses a slot that is highly likely to cause radio wave interference, the main apparatus 1 moves to another slot. In addition, the master unit of the cordless telephone device can be controlled.

  Here, a specific example of the prediction process of a slot that is highly likely to cause radio wave interference performed in the main apparatus 1 will be described with reference to FIGS. In addition, here, in order to simplify the description, the case where three cordless telephone devices 21, 22, 23 are connected to the main device 1 and the radio wave interference of the cordless telephone device 21 is predicted. Will be described as an example.

<When other system radio waves are generated in a fixed slot>
FIG. 7 is a diagram for explaining a case where radio waves from other systems or the like are generated in fixed slots. FIG. 7A shows the configuration of the slot table portion of the scan data stored in the scan data portion 15B of the data storage portion 15 of the main apparatus 1. That is, the slot table portion of the scan data includes a flag area for 12 slots from S0 to S11 for the downlink and a flag area for 12 slots from S12 to S23 for the uplink.

  7B, 7C, and 7D show a slot table portion of scan data transmitted from the base unit BS1 of the cordless telephone apparatus 21. FIG. In this case, FIG. 7B is a slot table portion of scan data with “sequence No.” = 1, and FIG. 7C is a slot table portion of scan data with “sequence No.” = 2. FIG. 7D shows a slot table portion of scan data of “sequence No.” = 3. Note that the channel used when generating these scan data is “Ch1 (channel 1)”.

  As can be seen from FIGS. 7B, 7C, and 7D, in the downlink, slots S0, S2, S4, S6, and S7 are set to “1 (on)” and some radio waves exist. In the uplink, slots S12, S14, and S16 are set to “1 (on)”, indicating that some radio wave exists. However, in this state, it is not known whether it is used by a cordless telephone apparatus of the same telephone system connected to the main apparatus 1 or by a terminal of another system such as PHS. Therefore, the control circuit 12 of the main device 1 refers to the used slot data files 15A1, 15A2, and 15A3 of the cordless telephone devices 21, 22, and 23 of the used slot data unit 15A of the data storage unit 15, and these cordless telephone devices 21, The slot used in 22 and 23 is grasped.

  Specifically, since the use slot data and the scan data having the same “sequence number” are generated at the same timing, the cordless telephone devices 21, 22, and 23 are used by associating them. You can grasp the slot that is. 7 (B), (C), and (D), slots indicated by “* (asterisk)” on the upper side of the slot table portion are used by the cordless telephone devices 21, 22, and 23. Suppose you have been identified. That is, it is assumed that slots S0, S2, and S4 are used in the cordless telephone apparatuses 21, 22, and 23 in the downlink and slots S12, S14, and S16 in the uplink.

  In this case, in FIGS. 7B, 7C, and 7D, it can be confirmed that radio waves of other systems exist in slots S6 and S7 indicated by hatching. Other slots do not generate radio waves from other systems that cause radio interference. In this case, since the control circuit 12 of the main device 1 continuously generates radio waves from other systems in the slots S6 and S7, it can be predicted that radio interference due to the radio waves will continue to occur in the slots S6 and S7.

  In this situation, the handset HS1 of the cordless telephone device 21 connects the telephone line to the other party through the main device 1 by answering the incoming call or making a call. Suppose that a call is made. At this time, the control circuit 41 of the base unit BS1 inquires of the main apparatus 1 about a slot that can be acquired as a traffic bearer. The control circuit 12 of the main apparatus 1 controls the base unit BS1 so as to avoid the slots S6 and S7 and acquire a slot serving as a traffic bearer from the prediction result of the slot where the radio wave interference occurs.

  FIG. 7E shows a specific example of a slot acquisition instruction (acquisition control) of the base unit BS1 of the cordless telephone apparatus 21 by the main apparatus 1. In this example, the main apparatus 1 controls to acquire the slot S8 as a traffic bearer while avoiding the slots S6 and S7 in which the radio waves of other systems are fixedly generated in the downlink. In addition, the slots S0 and S12 that the cordless telephone apparatus 21 has acquired as dummy bearers until then are opened. Further, although radio wave interference does not occur in the uplink, control is performed so as to acquire the slot S20 corresponding to the slot acquired in the downlink. If there is radio interference in the uplink, it is possible to control the uplink to predict a slot that is highly likely to receive radio interference, and to acquire a slot used for communication by avoiding that slot. is there.

  In this way, when a radio wave of another system exists in the same slot in a fixed manner, it is predicted that a radio wave of the other system will continue to be generated in the slot, and a slot used as a traffic bearer avoiding the slot Can get to.

<When other system radio waves are generated by moving the slot in one direction>
FIG. 8 is a diagram for explaining a case where radio waves of other systems are generated so as to move in the slot in one direction. FIG. 8A shows the configuration of the slot table part of the scan data stored in the scan data part 15B of the data storage part 15 of the main apparatus 1, as in FIG. 7A.

  8B, 8C, and 8D show a slot table portion of scan data transmitted from the base unit BS1 of the cordless telephone device 21. FIG. 8B shows the scan data slot table portion of “Sequence No.” = 1, FIG. 8C shows the scan data slot table portion of “Sequence No.” = 2, and FIG. ) Shows a slot table portion of scan data of “sequence No.” = 3. Note that the channel used when generating these scan data is “Ch1 (channel 1)”.

  Also in FIG. 8, the control circuit 12 of the main device 1 refers to the used slot data files 15A1, 15A2, 15A3 of the cordless telephone devices 21, 22, 23 of the used slot data unit 15A of the data storage unit 15, and these The slots used in the cordless telephone devices 21, 22, and 23 are grasped. In FIGS. 8B, 8C, and 8D, the slots indicated by “* (asterisk)” on the upper side of the slot table portion are used by the cordless telephone devices 21, 22, and 23. Suppose that

  That is, as shown in FIGS. 8B, 8C, and 8D, slots S0, S2, and S4 in the downlink and slots S12, S14, and S16 in the uplink are cordless telephone apparatuses 21, 22, and 23. Suppose it was used in Therefore, in the slot table portion of “Sequence No. = 1” shown in FIG. 8B, it can be understood that the radio waves of other systems exist in the slot S6. Further, in the slot table portion of “Sequence No. = 2” shown in FIG. 8C, it can be understood that the radio waves of other systems exist in the slot S7.

  Further, in the slot table portion of “Sequence No. = 3” shown in FIG. 8D, it can be understood that the radio waves of other systems exist in the slot S8. 8B, 8C, and 8D, the radio wave generation status of the other systems has moved from slot S6 to slot S7 to slot S8. It can be predicted that the radio waves of the system will move.

  In this situation, the handset HS1 of the cordless telephone device 21 connects the telephone line to the other party through the main device 1 by answering the incoming call or making a call. Suppose that a call is made. At this time, the control circuit 41 of the base unit BS1 inquires of the main apparatus 1 about a slot that can be acquired as a traffic bearer. The control circuit 12 of the main apparatus 1 obtains a slot serving as a traffic bearer by avoiding the slots S9, S10, and S11 that are likely to generate radio waves of another system next from the prediction result of the slot in which radio wave interference occurs. As such, the base unit BS1 is controlled.

  FIG. 8E shows a specific example of a slot acquisition instruction (acquisition control) of the base unit BS1 of the cordless telephone apparatus 21 by the main apparatus 1. In the case of this example, the main apparatus 1 performs control so as to acquire the slot S6 opposite to the radio wave moving direction of the other system in the downlink. Moreover, although radio wave interference does not occur in the uplink, control is performed so as to acquire the slot S18 corresponding to the slot acquired in the downlink. The slots S0 and S12 that have been used as dummy bearers until then are released. Also, if there is radio wave interference in the uplink slot, the uplink is also predicted to have a high possibility of receiving radio wave interference, and control is performed so that the slot used for communication is obtained avoiding that slot. Is possible.

  As described above, when a radio wave of another system exists while moving through the slot, a slot that is likely to receive radio wave interference due to the radio wave of the other system is predicted in consideration of the moving direction. As a result of the prediction, it is possible to obtain a slot to be used as a traffic bearer while avoiding a slot that is highly likely to receive radio wave interference due to radio waves of other systems.

<When radio waves from other systems are generated in the specified slot range>
FIG. 9 is a diagram for explaining a case where radio waves of other systems are generated in a predetermined slot range. FIG. 9A shows the configuration of the slot table portion of the scan data stored in the scan data portion 15B of the data storage portion 15 of the main apparatus 1, as in FIG. 7A.

  9B, 9C, and 9D show the slot table portion of the scan data transmitted from the base unit BS1 of the cordless telephone device 21. FIG. 9B shows the slot table portion of the scan data with “Sequence No.” = 1, FIG. 9C shows the slot table portion of the scan data with “Sequence No.” = 2, and FIG. ) Shows a slot table portion of scan data of “sequence No.” = 3. Note that the channel used when generating these scan data is “Ch1 (channel 1)”.

  Also in FIG. 9, the control circuit 12 of the main device 1 refers to the used slot data files 15A1, 15A2, and 15A3 of the cordless telephone devices 21, 22, and 23 of the used slot data unit 15A of the data storage unit 15, and these The slots used in the cordless telephone devices 21, 22, and 23 are grasped. 9 (B), (C), (D), the slot indicated by “* (asterisk)” on the upper side of the slot table portion is used by the cordless telephone devices 21, 22, and 23. Suppose that

  That is, as shown in FIGS. 9B, 9C, and 9D, slots S0, S2, and S4 in the downlink and slots S12, S14, and S16 in the uplink are cordless telephone apparatuses 21, 22, and 23, respectively. Suppose it was used in Therefore, in the slot table portion of “Sequence No. = 1” shown in FIG. 9B, it can be understood that the radio waves of other systems exist in the slot S5. Further, in the slot table portion of “Sequence No. = 2” shown in FIG. 9C, it can be understood that the radio waves of other systems exist in the slot S7.

  Further, in the slot table portion of “Sequence No. = 3” shown in FIG. 9D, it can be understood that the radio waves of other systems exist in the slot S6. Therefore, it can be seen that the radio wave generation status of other systems in FIGS. 9B, 9C, and 9D moves randomly within the range of slots S5, S6, and S7. Therefore, it can be predicted that the radio waves of other systems are likely to be generated in the slots S5, S6, and S7.

  In this situation, the handset HS1 of the cordless telephone device 21 connects the telephone line to the other party through the main device 1 by answering the incoming call or making a call. Suppose that a call is made. At this time, the control circuit 41 of the base unit BS1 inquires of the main apparatus 1 about a slot that can be acquired as a traffic bearer. The control circuit 12 of the main apparatus 1 obtains a slot serving as a traffic bearer by avoiding the slots S5, S6, and S7 that are likely to generate radio waves of another system next from the prediction result of the slot in which radio wave interference occurs. As such, the base unit BS1 is controlled.

  FIG. 9E shows a specific example of the slot acquisition instruction (acquisition control) of the base unit BS1 of the cordless telephone apparatus 21 by the main apparatus 1. In the case of this example, the main apparatus 1 controls to acquire slots S8, for example, avoiding slots S5, S6, and S7 that are likely to generate radio waves of other systems in the downlink. Further, although radio wave interference does not occur in the uplink, control is performed so as to acquire the slot S20 corresponding to the slot acquired in the downlink. The slots S0 and S12 that have been used as dummy bearers until then are released. Also, if there is radio wave interference in the uplink slot, the uplink is also predicted to have a high possibility of receiving radio wave interference, and control is performed so that the slot used for communication is obtained avoiding that slot. Is possible.

  As described above, when the radio wave of the other system is generated in the predetermined slot range, it is predicted that the radio wave interference from the radio wave of the other system is highly likely in the slot range. As a result of the prediction, it is possible to obtain a slot to be used as a traffic bearer while avoiding a slot that is highly likely to receive radio wave interference due to radio waves of other systems.

<When the slot in use is highly likely to receive radio wave interference>
FIG. 10 is a diagram for explaining a case where a slot in use is highly likely to receive radio wave interference due to radio waves of other systems. FIG. 10A shows the configuration of the slot table portion of the scan data stored in the scan data portion 15B of the data storage portion 15 of the main apparatus 1 as in FIG. 7A.

  10B, 10C, and 10D show a slot table portion of scan data transmitted from the base unit BS1 of the cordless telephone device 21. FIG. 10B shows the slot table portion of the scan data with “Sequence No.” = 1, and FIG. 10C shows the slot table portion of the scan data with “Sequence No.” = 2. ) Shows a slot table portion of scan data of “sequence No.” = 3. Note that the channel used when generating these scan data is “Ch1 (channel 1)”.

  Also in FIG. 10, the control circuit 12 of the main device 1 refers to the used slot data files 15A1, 15A2, 15A3 of the cordless telephone devices 21, 22, 23 of the used slot data unit 15A of the data storage unit 15, and these The slots used in the cordless telephone devices 21, 22, and 23 are grasped. In FIGS. 10B, 10C, and 10D, the slots indicated by “* (asterisk)” on the upper side of the slot table portion are used by the cordless telephone devices 21, 22, and 23. Suppose that

  That is, as shown in FIGS. 10B, 10C, and 10D, slots S2, S4, and S8 in the downlink and slots S14, S16, and S20 in the uplink are cordless telephone apparatuses 21, 22, and 23, respectively. Suppose it was used in Therefore, in the slot table portion of “Sequence No. = 1” shown in FIG. 10B, it can be understood that the radio waves of other systems exist in the slot S5. Further, in the slot table portion of “Sequence No. = 2” shown in FIG. 10C, it can be understood that the radio waves of other systems exist in the slot S6.

  Further, in the slot table portion of “Sequence No. = 3” shown in FIG. 10D, it can be understood that the radio waves of other systems exist in the slot S7. Therefore, in FIG. 10B, FIG. 10C, and FIG. 10D, the radio wave generation status of the other system is generated such that the radio wave of the other system moves through the slot as in slot S5 → S6 → S7. . From this situation, the control circuit 12 of the main device 1 can predict that next time, there is a high possibility that radio waves of other systems will be generated in the slot S8.

  In this case, it is assumed that the downlink slot S8 and the uplink slot S20 are acquired as traffic bearers by the cordless telephone apparatus 21 and used for a call. As described in detail, the control circuit 12 of the main device 1 predicts that there is a high possibility that a radio wave of another system will be generated next in the slot S8. However, the quality of the call performed through the cordless telephone device 21 deteriorates as it is. There is a fear. Therefore, the control circuit 12 instructs (controls) the base unit of the cordless telephone device 21 to move the slot being used.

  FIG. 10E shows a specific example of the movement instruction (movement control) of the slot of base unit BS1 of cordless telephone apparatus 21 by main apparatus 1. In the case of this example, the main device 1 may be affected by the radio waves of the other system in the slot S8 used in the cordless telephone device 21 which is highly likely to be affected by the radio waves of the other system in the downlink. Control is performed so as to move to the lower slot S0.

  Further, although radio wave interference does not occur in the uplink, control is performed so as to move to the slot S12 corresponding to the slot moving in the downlink. The slots S8 and S20 that have been used as traffic bearers until then are released. In addition, when radio interference occurs in the uplink slot, the uplink is also predicted to have a high possibility of receiving radio interference, and control is performed so that the slot used for communication is moved away from that slot. Is possible.

  In this way, for example, assuming that a slot used for a call can be predicted to receive radio wave interference due to radio waves of another system, in this case, the control circuit 12 of the main device 1 A cordless telephone device using a slot that is likely to be affected can be controlled to move the slot. Thereby, it is possible to prevent the call quality from being deteriorated during a call, and it is possible to prevent the control signal transmitted and received from being deteriorated during standby.

[The operation of the main unit of the cordless telephone device and the operation of the main device]
In the following, regarding the processing related to slot acquisition and movement performed by the base units BS1 to BSn of the cordless telephone devices 21 to 2n, and processing such as prediction of slots that are highly likely to receive radio wave interference performed by the main device 1, This will be described with reference to a flowchart. In the following description, the processes performed in base units BS1 to BSn will be described as processes performed in base unit BS1 in order to simplify the description.

[Carrier sense processing in the main unit]
FIG. 11 is a flowchart for explaining carrier sense processing executed in base unit BS1 of cordless telephone apparatus 21. Base unit BS1 executes carrier sense processing shown in FIG. 11 every 1.28 seconds based on a synchronization signal formed based on reference synchronization signal SYNC from main apparatus 1.

  That is, the carrier sense unit 4422 of the wireless communication circuit 44 receives a signal for the frame in the background, and detects whether there is a radio wave that causes radio wave interference in each slot of the received frame. Processing is performed (step S101). Information indicating the result of the carrier sense process is supplied to the control circuit 41 through the control unit 441 together with information indicating the slot used by the own device, and stored in the memory 411.

  Then, the notification processing unit 412 generates use slot data and scan data and transmits them to the main apparatus 1 (step S102). Specifically, in step S102, the notification processing unit 412 generates the use slot data described with reference to FIG. 4A based on the information indicating the use slot of the memory 411. Further, the notification processing unit 412 generates the scan data described with reference to FIG. 4B based on the information indicating the result of the carrier sense process in the memory 411. These use slot data and scan data are transmitted to the main device 1, and the main device 1 manages the respective data for each cordless telephone device in chronological order.

  Thereafter, the carrier sense unit 4422, the control unit 441, and the notification processing unit 412 end the processing shown in FIG. 11 and wait for the start timing after the next 1.28 seconds. With the processing shown in FIG. 11, the main device 1 arranges time series data for performing prediction processing of the slot that receives radio wave interference in the main device 1.

[Slot acquisition processing in the base unit]
FIG. 12 is a flowchart for explaining the slot acquisition process executed by base unit BS1 of cordless telephone device 21. The base unit BS1 executes the slot acquisition process shown in FIG. 12 when acquiring a slot used by the own unit, for example, when acquiring a slot as a traffic bearer when starting a call. Specifically, the slot control unit 413 performs processing to form an inquiry request for an acquirable slot and transmit it to the main apparatus 1 (step S201).

In response to the transmission of this inquiry request, as will be described later in the main apparatus 1, it avoids slots that are highly likely to receive radio wave interference due to radio waves of other systems, and notifies the slots that can perform good wireless communication. The slot control unit 413 receives this (step S202).
Next, the slot control unit 413 controls the TDMA modulation / demodulation unit 442 through the control unit 441 of the wireless communication circuit 44, and acquires the respective slots of the downlink and the uplink according to the instruction from the main apparatus 1. (Step S203). As a result, the base unit BS1 can perform wireless communication with the slave unit HS1 of the base unit through the acquired slot.

  After the process of step S203, the slot control unit 413 ends the process of the flowchart shown in FIG. 12 and waits for the next execution timing. With the processing shown in FIG. 12, when the cordless telephone device 21 needs to acquire a slot for wireless communication with the handset HS, the cordless telephone device 21 makes an inquiry to the main device 1 and is good without receiving radio wave interference. In response to an instruction for a slot capable of wireless communication, the slot can be acquired.

[Slot move processing on base unit]
FIG. 13 is a flowchart for explaining the slot movement process executed in the base unit BS1 of the cordless telephone device 21. In the control circuit 41 of the base unit BS1, the process shown in FIG. 13 is always executed while the power is turned on so that the process according to the control signal from the main apparatus 1 can be performed. ing.

  First, the control circuit 41 of the base unit BS1 receives a control signal from the main apparatus 1 (step S301), and determines whether or not a control signal from the main apparatus 1 has been received (step S302). In the determination process of step S302, when it is determined that the control signal from the main device 1 has not been received, the process from step S301 is repeated.

  When determining in step S302 that the control signal from the main apparatus 1 has been received, the control circuit 41 determines whether or not the received control signal indicates slot movement (step S303). When it is determined in the determination process of step S303 that the received control signal is an instruction to move the slot, the slot control unit 413 is operated to control the TDMA modulation / demodulation unit 442 through the control unit 441 of the wireless communication circuit 44. Then, the slot currently being used is released, and the slot moving process for acquiring and using the slot designated by the main apparatus 1 is performed (step S304). Thereafter, the control circuit 41 repeats the processing from step S301.

  If it is determined in step S303 that the received control signal does not instruct slot movement, the control circuit 41 executes processing according to the control signal (step S304). For example, various controls such as lighting / extinguishing control of an LED (Light Emitting Diode) corresponding to incoming / outgoing calls and calling control during incoming calls are performed. Thereafter, the control circuit 41 repeats the processing from step S301.

  With the processing shown in FIG. 13, even if the cordless telephone device 21 does not need to acquire or change the slot spontaneously, the slot used in the cordless telephone device 21 may be subject to radio wave interference. May take a high slot. When such a case is detected in the main device 1, the slot to be used can be moved according to the control from the main device 1. Thereby, it is possible to always perform radio communication appropriately and properly between the parent device BS1 and the child device HS1.

[Prediction processing of slot that receives radio wave interference of main device 1]
FIG. 14 is a flowchart for explaining a process of predicting a slot that receives radio wave interference in the cordless telephone apparatus connected to the own apparatus, which is executed by the main apparatus 1. The processing shown in FIG. 14 can be executed by determining a time zone, for example, but here, a case where it is always executed in the main apparatus 1 that is turned on will be described as an example. Further, the process shown in FIG. 14 is a process executed by the control circuit 12 of the main apparatus 1.

  Whether the control circuit 12 of the main device 1 receives information from the parent devices BS1 to BSn of the cordless telephone devices 21 to 2n connected to the own device (step S401), and has received information from the parent devices BS1 to BSn? It is determined whether or not (step S402). If it is determined in step S402 that no information has been received from the parent devices BS1 to BSn, the processing from step S401 is repeated.

  When it is determined in the determination process in step S402 that information has been received from the parent devices BS1 to BSn, the control circuit 12 determines whether the received information is scan data or used slot data (step S403). If it is determined in step S403 that the received information is scan data or used slot data, a data update process for the data storage unit 15 is executed (step S404).

  Specifically, in step S404, the control circuit 12 updates the use slot data file for the corresponding cordless telephone device in the use slot data unit 15A using the received use slot data. Similarly, the control circuit 12 updates the scan data file for the corresponding cordless telephone device in the scan data unit 15B using the received scan data. In this way, a fixed amount of used slot data is stored in the used slot data file for each telephone device in the used slot data portion 15A, and a fixed amount of data is stored in the scan data file for each telephone device in the scan data portion 15B. Scan data is accumulated in chronological order.

  Thereafter, as described with reference to FIGS. 7 to 10, the control circuit 12 performs a process of predicting a slot that is highly likely to cause radio wave interference (step S <b> 405). Specifically, in step S405, the control circuit 12 evaluates the radio wave of the own system from the radio wave of the other system with respect to the scan result of the scan table of the scan data file 15B1, 15B2,. I do. Here, the slot in which the radio wave of the own system exists and the slot in which the radio wave of the other system exists are distinguished from each other using slot data of the corresponding slot data files 15A1, 15A2,.

  Then, the control circuit 12 grasps the generation state of the radio waves of the other system based on the scan data obtained by evaluating the radio waves of the own system and the radio waves of the other system, and performs processing for determining the slot to be moved ( Step S406). In step S406, as described with reference to FIG. 10, a slot that is currently used in the cordless telephone device of the own system and that is likely to be subjected to radio wave interference due to radio waves of other systems in the future is determined. . If it is determined that there is a slot that is highly likely to receive radio wave interference, identify the slot and the cordless telephone device that uses the slot, and move the slot that is less likely to receive radio wave interference from other systems. Specify as a destination.

  Thereafter, the control circuit 12 determines whether or not the movement of the slot is necessary based on the determination process of step S406 (step S407). When it is determined that the movement of the slot is not necessary, the processing from step S401 is performed. repeat. If it is determined in step S407 that the slot needs to be moved, a control signal for moving the slot is formed on the basis of the information specified in step S406, and the parent of the cordless telephone device for this purpose is formed. The slot movement control is performed by transmitting to the machine (step S408).

  Specifically, in step S408, the slot is opened to the base unit of the cordless telephone apparatus using the slot that is highly likely to receive radio wave interference specified in step S406, and the specified destination slot is set. A control signal for obtaining and communicating is formed. Then, by transmitting the control signal to the base unit of the cordless telephone device, control is performed so as to move the slot to be used between the base unit and the slave unit of the cordless telephone device. After the process of step S408, the process from step S401 is repeated.

  As a result, the base unit of the cordless telephone device to be controlled can move the slot used for the wireless communication with the slave unit and continue the wireless communication without receiving the interference of the radio waves of other systems. Be made possible.

  On the other hand, if it is determined in step S403 that the received information is not scan data or used slot data, the control circuit 12 determines whether or not the received information is an inquiry about a slot to be acquired from the parent device. (Step S409). It is assumed that it is determined in the determination process in step S409 that the inquiry is for a slot to be acquired. In this case, as described with reference to FIGS. 7 to 10, the control circuit 12 performs a process of predicting a slot that is highly likely to cause radio wave interference (step S <b> 410).

  Specifically, in step S410, the control circuit 12 determines the own system for the scan result of the scan table of the scan data files 15B1, 15B2,. The radio waves of other systems and radio waves of other systems are evaluated. Here, using slot data of the corresponding slot data files 15A1, 15A2,... For the corresponding telephone device is used to distinguish the slot where the radio wave of the own system is present from the slot where the radio wave of the other system is present. Predict slots that are more likely to be interfered with.

  Next, based on the radio wave interference prediction process in step S410, the control circuit 12 specifies a slot that is unlikely to be subjected to radio wave interference of another system, which should be acquired by the inquiring cordless telephone device, as a use slot ( Step S411). After that, the control circuit 12 forms a control signal indicating the slot to be acquired with respect to the inquiring base unit, and transmits this to the base unit of the inquiring source cordless telephone apparatus to acquire the slot. Control is performed (step S412). After the process of step S412, the process from step S401 is repeated.

  As a result, according to the control from the main device 1, the parent device can acquire a slot that is unlikely to receive radio wave interference from other systems and perform wireless communication with the child device. To be.

  If it is determined in step S409 that the received information is not an inquiry about the slot to be acquired from the parent device, the control circuit 12 executes a process corresponding to the received information (step S409). S413). For example, when a call request from a cordless telephone device or a request to open a connected telephone line is transmitted from the base unit of the cordless telephone device, processing corresponding to the request is performed in step S413. Become. After the process of step S413, the process from step S401 is performed.

  With the processing shown in FIG. 14, the main apparatus 1 predicts a slot that is likely to cause interference due to radio waves of other systems, for a slot that is used by a cordless telephone apparatus connected to itself. The main device 1 can control to acquire a slot that is unlikely to receive radio wave interference from other systems in response to an inquiry from the parent device of the cordless telephone device connected to the own device. In addition, the main device 1 receives the interference of the radio wave of the other system when the slot already used in the cordless telephone device connected to the own device is highly likely to receive the radio wave interference of the other system. It can be controlled to move to a slot with a low possibility.

[Channel change control]
Note that the control circuit 12 of the main apparatus 1 may be subject to interference in a slot prediction process that is highly likely to receive radio wave interference from other systems using the time series data of the used slot data portion 15A and the scan data portion 15B. Suppose that a low slot of could not be identified. In this case, the control circuit 12 controls the corresponding master unit to change the channel to be used. Then, the base unit can receive a signal through the changed channel, perform carrier sense processing, transmit the result to the main apparatus 1, and can receive interference from other system radio waves for the frame received through the channel. Predictive slot prediction is performed.

  As a result, if the channel being used does not have a slot that allows stable communication due to radio waves from other systems, the channel is changed to identify a slot that can stably communicate, and this is used. Wireless communication between the parent device and the child device. When the channel is changed, the use slot data file and the scan data file of the cordless telephone device in which the time series data of the different channels before that are accumulated are initialized, and the new channel is changed. The frame is predicted to have a high possibility of receiving interference from other systems.

  As described above, the main apparatus 1 not only performs slot acquisition control and slot movement control, but also performs channel switching control through slot prediction processing that is likely to receive radio wave interference from other systems. You can also do that.

[Another example of predicting a slot that is highly likely to receive interference from other systems' radio waves]
In this embodiment, the typical example of the slot prediction process that is highly likely to be interfered by radio waves of other systems performed in the main apparatus 1 has been described with reference to FIGS. However, it is not limited to this. For example, when a radio wave of another system is periodically generated or disappears in a specific slot, the specific slot can be predicted to be a slot that receives interference of the radio wave of the other system in the period. . In addition, when the radio waves of other systems are generated or disappeared while moving periodically according to a certain rule, it is possible to predict which slot will receive the interference of the radio waves of other systems. .

  Thus, based on the scan data and the used slot data, the radio wave generation status of other systems is grasped, and the temporal generation pattern and the positional pattern on the slot constituting the frame are specified. Based on the identified pattern, it is possible to appropriately predict when (at which timing) and which slot will receive radio wave interference from other systems. Thereby, slot acquisition control and movement control can be performed for each parent device in more detail and appropriately.

[Effect of the embodiment]
According to the telephone system of the above-described embodiment, the main device 1 and the parent devices BS1 to BSn connected to the main device 1 cooperate with each other in the frames used by the cordless telephone devices 21 to 2n. It is possible to appropriately predict a slot that is likely to receive radio wave interference. In other words, the main device 1 and the parent devices BS1 to BSn connected thereto cooperate to cause interference of radio waves of other systems in the frames used by the cordless telephone devices 21 to 2n. Low slots can be properly predicted. Thereby, based on the prediction result, main device 1 responds to an inquiry from parent devices BS1 to BSn, and acquires a slot that is unlikely to receive radio wave interference from other systems. Can be controlled.

  Further, based on the prediction result, the main device 1 can identify a slot that is likely to receive radio wave interference from other systems among the slots used in the cordless telephone devices 21 to 2n. In other words, the main device 1 and the parent devices BS1 to BSn connected thereto cooperate to cause interference of radio waves of other systems in the frames used by the cordless telephone devices 21 to 2n. Low slots can be properly predicted. In this case, main device 1 can control base units BS1 to BSn so as to move to a slot that is unlikely to receive radio wave interference from other systems.

  Furthermore, when there is no slot that is unlikely to receive radio wave interference from other systems in the channel being used, the channel can be changed.

  In this way, in each of the cordless telephone devices 21 to 2n connected to the main device 1, wireless communication is performed between the parent device and the child device using a slot that is unlikely to be affected by radio waves of other systems. Can be done.

[Modification]
In the above-described embodiment, the base units BS1 to BSn of the cordless telephone apparatus perform carrier sense processing at a period of 1.28 seconds, generate use slot data and scan data, and transmit them to the main apparatus 1. However, it is not limited to this. It is possible to generate carrier slot data and scan data by performing carrier sense processing at an appropriate period determined by synchronizing between cordless telephone devices connected to the main device 1 and transmit it to the main device 1 .

  The storage capacity of the used slot data file for each telephone device in the used slot data portion 15A and the scan data file for each telephone device in the scan data portion 15B formed in the data storage unit 15 of the main device 1 is as follows. It is determined from the viewpoint of accuracy of prediction processing.

  Moreover, although the carrier sense process performed in the main | base station BS1-BSn shown in the flowchart of FIG. 11 and the prediction process performed in the main apparatus 1 shown in the flowchart of FIG. 14 were demonstrated as what is always performed. However, it is not limited to this. For example, it is executed in a certain period immediately after the introduction of the telephone system, and the process can be stopped when radio interference due to radio waves of other systems hardly occurs. And when the case where a call control is not performed appropriately generate | occur | produces or the state which a call voice degrades can also be made to perform the process shown in FIGS.

  Further, in the above-described embodiment, the cordless telephone device has been described as one using the DECT standard communication method, but is not limited thereto. Multiple communication channels can be used between the cordless telephone device's master unit and slave units, and the unit communication period is divided into a plurality of slots in the selected communication channel for communication from the master unit to the slave units. The present invention can be applied to the case where wireless communication is performed using at least one slot in each of the communication from the child device to the parent device.

  Also, the radio waves of other systems are out of frame synchronization because they are not connected to the same main device, and move between frames with this deviation occurring. Therefore, by detecting the movement width of radio waves of other systems, it is possible to detect in advance whether or not the influence of radio wave interference will occur when a call is transferred. That is, when the slot where the radio wave of another system is generated changes, the width (number of slots) of the movement is grasped, and the slot which receives the interference of the radio wave of the other system using the movement width and the direction of movement. Can be predicted.

  In the above-described embodiment, the host device of the cordless telephone device has been described as the main device, but the present invention is not limited to this. The host device includes, for example, a device that performs call control by accommodating one or more communication lines such as a SIP (Session Initiation Protocol) server and accommodating a plurality of cordless telephone devices. .

[Others]
As can be seen from the description of the above-described embodiment, the function of the detection unit of the parent device (hereinafter simply referred to as the parent device) in the claims is the same as the parent device BS1 of the embodiment (hereinafter simply referred to as the parent device). (Referred to as BS1 etc.)). The functions of the first and second transmission means are mainly realized by the notification processing unit 412 such as the base unit BS1. Further, the function of the instruction information receiving means of the parent device is realized mainly by the line LSI unit such as the parent device BS1, and the function of the control means of the parent device is realized by the slot control unit 413 such as the parent device BS1. . The function of the inquiry means of the parent device is realized by the control circuit 41 such as the parent device BS1.

  The functions of the first and second receiving means of the host device (hereinafter simply referred to as host device) in the claims are the same as those of the main device 1 (hereinafter simply referred to as main device 1) of the embodiment. The line LSI unit 13 is realized. Further, the function of the scan data storage means of the host device is realized by the scan data unit 15B of the main device 1, and the function of the use slot data storage means of the host device is realized by the use slot data unit 15A of the main device 1. Yes. Further, the control circuit 12 of the main device 1 realizes the function of the prediction means of the host device. Also, the function of the instruction information transmission means of the host device is realized by the cooperation of the control circuit 12 and the line LSI unit 13 of the main device 1. In addition, the function of the inquiry reception means of the host device is realized by the line LSI unit 13 and the control circuit 12 of the main device 1.

  DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 11 ... Line I / F, 12 ... Control circuit, 13 ... Line LSI part, 14 ... Reference oscillator, 15 ... Data storage part, 15A ... Used slot data part, 15B ... Scan data part, 21-2n ... Cordless telephone device, BS1 to BSn ... Master unit, HS1 to HSn ... Slave unit, 41 ... Control circuit, 411 ... Memory, 412 ... Notification processing unit, 413 ... Slot control unit, 42 ... Line LSI unit, 43 ... Synchronization signal Generating circuit, 431 ... counter, 432 ... synchronization signal generating unit, 44 ... wireless communication circuit, 441 ... control unit, 442 ... TDMA modulation / demodulation unit, 4421 ... PLL unit, 4422 ... carrier sense unit, 443 ... wireless communication unit

Claims (3)

A plurality of cordless telephone devices composed of a parent device and a child device are connected to the host device, and a unit communication period is set to a plurality of slots in the selected communication channel between the parent device and the child device. In each of the communication from the parent device to the child device and the communication from the child device to the parent device, at least one slot is used for TDMA (Time Division Multiple Access) / TDD (Time Division Duplex). In a telephone system that performs wireless communication using the time division duplex method.
Each of the master units
Detecting means for receiving a signal of a channel used for communication with a slave at every predetermined timing, and detecting the presence or absence of signals in the plurality of slots in the unit communication period;
First transmission means for transmitting scan data including identification information of the own device and information indicating presence / absence of a signal for each of the plurality of slots detected by the detection means, to the host device;
Second transmission means for transmitting use slot data including identification information of the own device and information indicating the use channel and the use slot of the own device to the higher-order device at each predetermined timing;
Instruction information receiving means for receiving instruction information from the host device;
Control means for controlling to select a slot to be used for communication with the slave unit based on the instruction information received through the receiving means, and
The host device is
First receiving means for receiving the scan data from the master unit;
Scan data storage means for storing and holding the scan data received through the first receiving means for each of the master units in chronological order;
Second receiving means for receiving the used slot data from the base unit;
Used slot data storage means for storing and holding the used slot data received through the second receiving means for each of the master units in chronological order;
Prediction means for predicting a slot that may be affected by radio wave interference based on the accumulated data of the scan data storage means and the accumulated data of the used slot data storage means;
A telephone system comprising: instruction information transmission means for forming instruction information for instructing a slot to be used based on a prediction result of the prediction means and transmitting the instruction information to the parent device. The telephone system according to claim 1,
Each of the master units
When acquiring a slot to be used for notification in the unit communication period, comprising inquiry means for making an inquiry about the slot suitable for acquisition to the host device,
The host device is
Inquiry accepting means for accepting the inquiry from each of the parent machine,
The telephone system characterized in that the instruction information transmitting means forms the instruction information when the inquiry is accepted through the inquiry accepting means. The telephone system according to claim 1,
The instruction information transmission unit of the higher-level device is configured to provide the instruction information for the parent device when a prediction result from the prediction unit includes a parent device in which a slot currently in use may be affected by radio wave interference. A telephone system characterized by instructing the parent device to move a slot by forming and transmitting

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