JP6489303B2 - Host device of wireless communication system - Google Patents

Description

  The present invention is an upper layer used in a wireless communication system including a digital cordless telephone apparatus to which a TDMA (Time Division Multiple Access) / TDD (Time Division Duplex) system is applied. Relates to the device.

  In recent years, a business phone system (button telephone system) has been provided in which a cordless telephone device in which a parent device and a child device are wirelessly connected is connected to a host device (communication control device) such as a main device or a SIP server. It is becoming. In many cases, a communication system conforming to the DECT (Digital Enhanced Cordless Telecommunication) standard is used between the parent device and the child device constituting the cordless telephone device. In the DECT standard, the downlink communication method from the parent device to the child device is a time division duplex method using a time division multiplexing method, and the uplink communication method from the child device to the parent device is a time division method. It is determined that this is a multiple access method. Further, in the DECT standard, the frequency band to be used is “1.9 GHz band” different from the “2.4 GHz band” in the case of the conventional cordless telephone apparatus, and the maximum number of channels is 5 channels. Is stipulated.

  In the DECT standard, as disclosed in Patent Document 1 and the like, one frame in one channel of encoded data is 10 milliseconds (ms), and as shown in FIG. It is divided into In the following, a time slot is simply referred to as a slot. The 12 slots S0 to S11 in the first half frame period of one frame are used for the downlink from the master unit to the slave units, and the 12 slots S12 to S23 in the second half frame period are used as the slave units. Used for uplink from the main unit to the base unit.

  In the DECT standard, in consideration of the lock-up time of a PLL (Phase locked Loop) synthesizer when adjacent slots are used, in general, every slot adjacent to the slot in use is free and every other slot is used. Wireless communication is performed using a slot. The lock-up time means the time from setting the frequency until the phase control by the PLL is completed. Therefore, in order to make a call with a DECT standard cordless telephone device, as shown in FIG. 12B, in the downlink, six slots of alternate slots S0, S2, S4, S6, S8, and S10 are used. . In the uplink, six slots of every other slot S12, S14, S16, S18, S20, S22 are used. For this reason, in one channel, a maximum of six calls can be made simultaneously.

JP 2001-510972 A

  In the cordless telephone device of the DECT standard used in the business phone system, if the power is not turned off, one cordless telephone device uses one of the 12 slots in the standby state (idle state). Control signals etc. can be sent and received between the slave unit and the slave unit. The slot at this time is called a dummy bearer. From this state, for example, when there is an incoming call and the host device notifies the master unit of the incoming call, the master unit uses a dummy bearer to notify the slave unit of a data session connection request, etc. Search and try to get a slot to use for a call. If the slot can be acquired, a call can be performed using the acquired slot. In this way, a slot acquired by searching for starting communication is called a traffic bearer.

  In a business phone system, a plurality of cordless telephone devices may be accommodated in the same group sharing one channel with respect to a host device. In such a case, an incoming notification may be made simultaneously to a plurality of cordless telephone devices sharing one channel, such as simultaneous incoming calls or group incoming calls. At this time, all the cordless telephone devices that have received the incoming call notification search for an empty slot at a timing corresponding to the incoming call notification from the host device, that is, at the same timing, and try to acquire a traffic bearer used for communication. In the cordless telephone device of the DECT standard, as described above, the number of slots that can be used in one channel is determined, and a dummy bearer is also used, so that the number of empty slots is limited. For this reason, when a plurality of cordless telephone apparatuses start searching for an empty slot all at once, a plurality of cordless telephone apparatuses may attempt to acquire the same empty slot.

  At this time, one cordless telephone device can acquire an empty slot, but the other cordless telephone devices perform another empty slot search process in the form of retry. However, when a plurality of cordless telephone devices retries at almost the same timing even during the retry, there is a possibility that an empty slot to be acquired by the plurality of cordless telephone devices may be covered as in the previous search. is there. For this reason, it is conceivable that the retry notification is repeated many times and the incoming notification is delayed. In the worst case, it is considered that the upper limit of the number of retry settings may be exceeded and a cordless telephone device that does not notify incoming calls may occur.

  In view of the above, in the business phone system configured using a so-called DECT cordless telephone device, the present invention further enhances the above-described problems and allows communication through the cordless telephone device to be performed appropriately and reliably at all times. The purpose is to.

In order to solve the above-mentioned problem, the host device of the wireless communication 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 the unit communication period is divided into a plurality of slots between the parent device and the child device. In each of the communication to the slave unit and the communication from the slave unit to the master unit, one of the plurality of slots is used to perform TDMA (Time Division Multiple Access) / TDD (Time Division Duplex). (Time Division Duplex) A wireless communication system in which the cordless telephone apparatus performs a process of searching for and specifying an empty slot used by the slave unit for communication in accordance with an instruction from the master unit. A host device of a communication system,
Storage means for storing information indicating the operation state of each of the plurality of cordless telephone devices connected to the device;
When an incoming call to be notified to a plurality of cordless telephone devices occurs, it is determined whether or not there are a plurality of cordless telephone devices in a standby state capable of responding to the incoming call based on the stored information of the storage means. Discrimination means;
When the determination means determines that there are a plurality of the cordless telephone devices in a standby state capable of responding to an incoming call, the notification timing of the incoming calls to the plurality of cordless telephone devices in a standby state capable of responding to the incoming call is shifted. Control means to control ,
Group storage means for storing identification information of a plurality of cordless telephone devices for each of a plurality of groups having different execution timings of search processing of slots used for a call;
With
The control means controls the incoming call notification timing to be shifted for each group managed by the group storage means.

According to the host device of the wireless communication system of the first aspect of the present invention, a plurality of cordless telephone devices adopting a so-called DECT standard communication system are connected to the host device. In the host device, information indicating the operation states of a plurality of cordless telephone devices connected to the own device is managed by the storage means. Then, when an incoming call to be notified to a plurality of cordless telephone devices occurs, the determination means determines whether there are a plurality of standby cordless telephone devices that can respond to the incoming call based on the stored information of the storage device. Determine. When the determining means determines that there are a plurality of standby cordless telephone devices that can respond to incoming calls, the control means receives incoming calls to a plurality of standby cordless telephone devices that can respond to incoming calls to be notified of incoming calls. Control to shift the notification timing. In the host device, the group storage means stores identification information of the plurality of cordless telephone devices for each of a plurality of groups that vary the execution timing of the search processing for slots used for a call. For this reason, the control means performs control so as to shift the notification timing of incoming calls for each group managed by the group storage means.

  In this way, when an incoming call that should be notified to a plurality of cordless telephone devices such as a simultaneous incoming call or a group incoming call occurs, the notification timing of the incoming calls to a plurality of cordless telephone devices in a standby state that can respond to the incoming call is shifted. To be controlled. As a result, it is possible to avoid a situation in which a plurality of cordless telephone devices in a standby state capable of responding to incoming calls start searching for empty slots at the same time, so that the number of retries for empty slot search processing is effectively reduced. be able to. As a result, in a business phone system configured to accommodate a plurality of cordless telephone devices, communication through the cordless telephone device can be performed appropriately and reliably at all times.

  In this specification, “simultaneous incoming call” means an incoming call that should be notified to terminals such as all cordless telephone devices accommodated in the host device. The “group incoming call” means an incoming call that should be notified to a terminal such as a plurality of cordless telephone devices connected to a predetermined channel of the host device.

  According to the present invention, in a business phone system configured using a so-called DECT standard cordless telephone device, communication through the cordless telephone device can be performed properly and reliably at all times.

It is a block diagram for demonstrating the outline | summary of the whole embodiment of the radio | wireless communications system by this invention. It is a block diagram which shows the detailed structural example of the main apparatus which comprises a part of embodiment of the radio | wireless communications system by this invention. It is a block diagram which shows the detailed structural example of the main | base station which comprises a part of embodiment of the radio | wireless communications system by this invention. It is a block diagram which shows the detailed structural example of the subunit | mobile_unit which comprises a part of embodiment of the radio | wireless communications system by this invention. It is a figure for demonstrating the specific example of three tables with which the terminal management table part 14 is provided. FIG. 6 is a diagram for explaining empty slot search processing and merge processing performed at the time of notification of an incoming call or the like in the cordless telephone apparatuses 21 to 2n. It is a figure for demonstrating the detail of the process in the case of being shown to FIG.6 (E). It is a figure for demonstrating the specific example in the case of changing the start timing of the search process of an empty slot for every group to which a cordless telephone apparatus belongs. FIG. 9 is a sequence diagram of the process described in FIG. It is a figure for demonstrating the specific example of the update process of the terminal group management table 14C. 4 is a flowchart for explaining processing at the time of simultaneous incoming calls executed by the main device 1; It is a figure for demonstrating the slot of DECT specification.

  Hereinafter, an embodiment of a system, apparatus, method, and program according to the present invention will be described with reference to the drawings. In the embodiments described below, the present invention will be described by taking as an example a case where the present invention is applied to a telephone system called a business phone system provided in a premises such as a company.

[Configuration example of wireless communication system; FIG. 1]
FIG. 1 is a block diagram showing an example of the overall configuration of a telephone system 10 as an embodiment of a wireless communication system according to the present invention. In the telephone system 10 of this example, a plurality of cordless telephone devices 21, 22,..., 2n (n is an integer of 2 or more. The same) 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. In this specification, each of the cordless telephone apparatuses 21 to 2n may be simply referred to as a terminal.

  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 is also possible to do.

  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 can accommodate one or a plurality of telephone lines L1 to Lm (m is an integer of 1 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).

  The main apparatus 1 includes a control circuit 12 that functions as a terminal management unit, which will be described later, and a terminal management table unit 14 that includes a plurality of types of management tables. As will be described in detail later, the control circuit 12 functioning as a terminal management unit can control the search timing of slots used for calls to the cordless telephone apparatuses 21 to 2n accommodated in the main apparatus 1. The terminal management table unit 14 manages information related to the cordless telephone apparatuses 21 to 2n based on information from the cordless telephone apparatuses 21 to 2n connected (accommodated) to the main apparatus 1. Details of the terminal management table unit 14 will be described later.

  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. )) A frame synchronization signal as a synchronization signal is generated, and based on the generated frame synchronization signal, TDMA / TDD wireless communication using the DECT standard is executed between the slave units HS1 to HSn. . 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 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, for example, every other slot.

[Configuration Example of Main Device 1; FIG. 2]
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, terminal management table unit 14, and reference oscillator 15. The control circuit 12 of the main device 1 according to this embodiment has a function as a terminal management unit that manages the operation timing of the cordless telephone device such as the incoming notification timing of the cordless telephone device connected to the main device 1. .

  The line interface 11 supplies voice signals (received voice signals) from the lines L1 to Ln 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 15 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.

  The terminal management table unit 14 is configured by a nonvolatile memory, and manages information related to the cordless telephone devices 21 to 2n connected (accommodated) to the main device 1. FIG. 5 is a diagram for explaining a specific example of three tables provided in the terminal management table unit 14. As shown in FIG. 5, the terminal management table unit 14 includes a terminal operation state management table 14A (FIG. 5A), a terminal response count table 14B (FIG. 5B), and a terminal group management table 14C. (FIG. 5C) is provided.

  Each of base units BS1 to BSn has a function of notifying main apparatus 1 every time the operation state of the base unit changes. For this reason, in the terminal operation state management table 14A, the current operation state is updated for each cordless telephone device (terminal) in real time by the control circuit 12 as a terminal management unit. The terminal operation state management table 14A shown in FIG. 5A shows a case where it is managed that the cordless telephone device 21 is in use but the other cordless telephone devices 22 to 24 are in a standby state. Yes. From the information in the terminal operation state management table 14A, it is possible to instantaneously determine how many cordless telephone devices are in a standby state to be notified of an incoming call.

  In the terminal response count table 14B, the number of times of responding to incoming calls is cumulatively updated for each terminal by the control circuit 12 serving as a terminal management unit. This update is also performed based on notifications from the base units BS1 to BSn to the main apparatus 1 of information indicating the operation state of the own unit. In the terminal response count table 14B shown in FIG. 5B, the cordless telephone device 21 receives the call five times, the cordless telephone device 22 four times, the cordless telephone device 23 three times, and the cordless telephone device 24 twice. It is managed to respond to. This makes it possible to determine which cordless telephone device is often used for incoming response.

  Further, the terminal group management table 14C includes a terminal group having a large number of responses to incoming calls based on the information in the terminal response count table 14B shown in FIG. It can be divided into a few terminal groups. In the terminal group management table 14C shown in FIG. 5C, the cordless telephone apparatuses 21 and 22 having a relatively large number of responses are group 1 based on the information in the terminal response count table shown in FIG. It is managed that the cordless telephone apparatuses 23 and 24 having a relatively small number of responses constitute the group 2. The terminal group managed by the terminal group management table 14C is a group that varies the timing of incoming notification, as will be described in detail later. In FIG. 5C, it is assumed that group 1 has a higher priority than group 2.

  By providing such a terminal management table unit 14, the main device 1 shifts the notification timing of incoming calls when there are a plurality of standby cordless telephone devices to be notified of incoming calls, for example. To be able to control. When there are a plurality of standby cordless telephone devices that should be notified of an incoming call, and when the incoming calls are simultaneously notified to the plurality of cordless telephone devices, an empty slot to be acquired is incurred in the empty slot search process. This is because there is a risk of (overlapping).

  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.

[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 of configuration of base unit; FIG. 3>
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.

  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. In this embodiment, the wireless communication circuit 44 uses a general-purpose wireless communication LSI for a parent device for performing DECT standard wireless communication. 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 and 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.

  Normally, base unit BS1 is connected to main unit 1 and starts synchronization processing for communication with slave unit HS1 as described above, and always communicates with slave unit HS1 through a dummy bearer. Maintains a possible state. That is, the control unit 441 of the radio communication circuit 44 of the base unit BS1 sends the transmission signal generated by the TDMA modulation / demodulation unit 442 to the slave unit HS1 through the radio communication unit 443 using one slot set in the base unit. When a response is returned from the slave unit HS1, the slot used to transmit the transmission signal is used for the downlink, and the slot that received the response from the slave unit HS1 is established for the uplink. Then, control is performed to perform transmission / reception.

  Further, when the incoming call is notified, the base unit BS1 sends this to the mobile unit HS1. When receiving the incoming call notification, the slave unit HS1 performs a search process for an empty slot, identifies a slot (traffic bearer) used for communication, notifies the master unit BS1, and uses the acquired slot to The device BS1 and the child device HS1 are connected to each other so that a state in which a call can be made can be formed.

<Example configuration of slave unit; FIG. 4>
FIG. 4 is a block diagram illustrating a configuration example of the child device HS1. As shown in FIG. 4, the handset HS <b> 1 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.

  In addition, the control unit 511 of the wireless communication circuit 51 controls the TDMA modulation / demodulation unit 512 according to the control signal from the base unit BS1 corresponding to the own device, and searches for a slot used for communication in the downlink and the uplink. Identification and processing of reception / transmission can be performed. That is, at the time of standby, the base unit BS1 and the slave unit HS1 can transmit and receive control signals through one slot (dummy bearer) determined in advance in the downlink and uplink.

  For example, when a simultaneous incoming call occurs and an incoming notification from the main unit 1 is notified to the slave unit HS1 via the master unit BS1, the slave unit HS1 performs a search process for an empty slot, and the idle unit is used for a call. Get a slot. Then, the slave unit HS1 cooperates with the master unit BS1 so that a call can be performed using the acquired empty slot as a traffic bearer.

  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.

[Available slot search processing and merge processing for incoming notification]
Next, in the cordless telephone devices 21 to 2n of this embodiment, for example, empty slot search processing and merge processing performed at the time of incoming call notification will be specifically described. FIG. 6 is a diagram for explaining empty slot search processing and merge processing performed at the time of notification of incoming calls in the cordless telephone apparatuses 21 to 2n of this embodiment.

  In the communication method of the DECT standard, as described with reference to FIG. 12, the downlink for performing communication from the parent device to the child device in one frame and the uplink for performing communication from the child device to the parent device. Is provided. However, the downlink slot and the uplink slot are always used in pairs, for example, the downlink slot S0 and the uplink slot S12 are used in pairs. Therefore, in the following, in order to simplify the description, the search process and the merge process in the uplink will be described as an example.

  First, consider a case where only one cordless telephone device 21 is accommodated in the main device 1. Then, as shown in FIG. 6A, it is assumed that the cordless telephone device 21 is in a standby state using the slot S12 as a dummy bearer. Since only the cordless telephone device 21 is connected to the main device 1, the slots S14, S16, S18, S20, and S22 are empty slots.

  In this case, when the cordless telephone device 21 receives an incoming call notification, the handset HS1 of the cordless telephone device 21 performs a slot search process. When this search process is a process of searching in order from the head side of the uplink (slot S12 side), as indicated by an arrow in FIG. 6A, the empty slot S14 is specified as a slot to be acquired. And the subunit | mobile_unit HS1 acquires the empty slot S14 as a traffic bearer for the cordless telephone apparatus 21, as shown to FIG. 6 (B). However, in this case, as shown in FIG. 6B, when the slot S12 of the dummy bearer that is no longer used is secured, the slot S12 and the slot S14 are occupied by the cordless telephone device 21. In such a state, when a plurality of cordless telephone devices are accommodated in the main device 1, the room for selecting a traffic bearer is narrowed.

  For this reason, in the cordless telephone apparatuses 21 to 2n of this embodiment, as shown in FIG. 6C, after acquiring the traffic bearer, the dummy bearer that has been occupied is released immediately. As described above, in this specification, a process of merging (unifying) the slots used for communication between the master unit and the slave unit into one slot after releasing the dummy bearer immediately after acquiring the traffic bearer. That's it.

  Next, consider a case where four cordless telephone apparatuses 21, 22, 23, and 24 are accommodated in the main apparatus 1 as shown in FIG. In this case, as shown in FIG. 6D, the cordless telephone device 21 has a slot S12, the cordless telephone device 22 has a slot S14, the cordless telephone device 23 has a slot S18, and the cordless telephone device 24 has a slot S20. Assume that it is occupied as Therefore, the empty slots are slot S16 and slot S22.

  Assume that a simultaneous incoming call occurs when each of the cordless telephone apparatuses 21, 22, 23, and 24 is in a standby state. In this case, when the main device 1 notifies all of the cordless telephone devices 21, 22, 23, and 24 at the same time, the cordless telephone devices 21, 22, 23, and 24 have the slave devices HS1, HS2, HS3, and HS4. The search process for empty slots is started at once. In this case, as shown in FIG. 6E, the handset HS1, HS2, HS3, HS4 of the cordless telephone apparatuses 21, 22, 23, 24 is likely to try to acquire the same empty slot S16. In this case, any one of the cordless telephone devices 21, 22, 23, and 24 can acquire the empty slot S16 as a traffic bearer, but the other three cordless telephone devices cannot acquire a traffic bearer and perform retry processing. become.

  Each of the cordless telephone apparatuses 21 to 2n of the wireless telephone system of this embodiment can efficiently use the slot by performing the merge process as described above. However, when a traffic bearer is acquired, two slots of a dummy bearer and a traffic bearer are temporarily used until communication between the parent device and the child device is established. That is, a state where two slots are used by one cordless telephone device occurs. For this reason, although there is a very limited time, the number of empty slots may be reduced.

  FIG. 7 is a diagram for explaining details of the case shown in FIG. FIG. 7 (A) is the same diagram as FIG. 6 (E), and the cordless telephone devices 21, 22, 23, 24 have collided with each other, trying to acquire the same empty slot S16, as the handset HS1, HS2, HS3, HS4. Shows the case. The processing performed in the wireless communication system in this case is shown in FIG.

  That is, when the first collision (collision 1) occurs, for example, it is assumed that the cordless telephone device 21 can acquire the empty slot S16 as a traffic bearer. In this case, the three cordless telephone devices 22, 23, and 24 have failed to acquire traffic bearers. However, when the cordless telephone device 21 acquires the traffic bearer, slot merging processing is performed, and the slot S12 used by the cordless telephone device 21 as a dummy bearer becomes an empty slot.

  Next, the handset HS2, HS3, HS4 of the cordless telephone apparatuses 22, 23, 24 that could not acquire the traffic bearer searches for an empty slot at the timing according to the timing signal from the main apparatus 1, as described above. Process. Also in this case, the slave units HS2, HS3, and HS4 of the cordless telephone apparatuses 22, 23, and 34 perform the empty slot search process at almost the same timing, so that the second collision (collision 2) occurs. However, one cordless telephone device can acquire a traffic bearer.

  Here, as shown in FIG. 7B, it is assumed that the cordless telephone device 22 has been able to acquire, for example, an empty slot S12 as a traffic bearer. In this case, the two cordless telephone devices 23 and 24 have failed to acquire the traffic bearer. However, when the cordless telephone device 22 acquires the traffic bearer, slot merging processing is performed, and the slot S14 used by the cordless telephone device 22 as a dummy bearer becomes an empty slot.

  Next, as described above, cordless handsets HS3 and HS4 of cordless telephone apparatuses 23 and 24 that have not acquired a traffic bearer perform an empty slot search process at a timing according to the timing signal from main apparatus 1. Also in this case, the slave units HS3 and HS4 of the cordless telephone devices 23 and 24 perform the empty slot search process at almost the same timing, so that the third collision (collision 3) occurs. However, one cordless telephone device can acquire a traffic bearer.

  Here, as shown in FIG. 7B, it is assumed that the cordless telephone device 23 can acquire, for example, an empty slot S14 as a traffic bearer. In this case, the cordless telephone device 24 has failed to acquire the traffic bearer. However, when the cordless telephone device 23 acquires the traffic bearer, slot merging processing is performed, and the slot S18 used by the cordless telephone device 23 as a dummy bearer becomes an empty slot.

  Then, as described above, the handset HS4 of the cordless telephone device 24 that could not acquire the traffic bearer performs an empty slot search process at a timing according to the timing signal from the main device 1. In this case, since only the cordless telephone device 24 has not acquired the traffic bearer, no collision occurs. Therefore, as shown in FIG. 7B, the cordless telephone device 24 acquires, for example, an empty slot S18 as a traffic bearer. Then, when the cordless telephone device 24 acquires the traffic bearer, merge processing is performed, and the slot S20 used by the cordless telephone device 24 as a dummy bearer becomes an empty slot.

  As described above, when the four cordless telephone apparatuses 21, 22, 23, and 34 in the standby state simultaneously search for an empty slot and try to acquire a traffic bearer, three collisions occur. For this reason, in order for all four cordless telephone devices to acquire a traffic bearer, three retry processes are required, and a considerable amount of time is required until the last cordless telephone device acquires a traffic bearer. Become.

[Grouping cordless telephone devices]
Therefore, in the wireless communication system of this embodiment, a plurality of cordless telephone devices are divided into a plurality of groups, and the start timing of the empty slot search process is different for each group. FIG. 8 is a diagram for explaining a specific example in the case where the plurality of cordless telephone devices are divided into a plurality of groups and the start timing of the empty slot search process is different for each group in the wireless communication system of this embodiment. is there.

  Here, as shown in FIG. 8 (A), as in the case shown in FIG. 6 (D), the case where four cordless telephone devices 21, 22, 23, 24 are accommodated in the main device 1 is shown. Think. In this case, as shown in FIG. 8A, the cordless telephone device 21 has a slot S12, the cordless telephone device 22 has a slot S14, the cordless telephone device 23 has a slot S18, and the cordless telephone device 24 has a slot S20. Assume that it is occupied as Therefore, the empty slots are slot S16 and slot S22.

  Assume that a simultaneous incoming call occurs when each of the cordless telephone apparatuses 21, 22, 23, and 24 is in a standby state. However, in the case of the example shown in FIG. 8, the handset HS1, HS2, HS3, HS4 of the cordless telephone apparatuses 21, 22, 23, 24 does not perform the same empty slot search process all at once, but in units of groups. The search processing start timing of each cordless telephone apparatus is controlled so that the search processing is performed.

  In this example, in the terminal group management table of the terminal management table unit 14 of the main device 1, as shown in FIG. 5C, the cordless telephone devices 21 and 22 are group 1, and the cordless telephone devices 23 and 24 are group. It is assumed that they are grouped as 2. As described above, it is assumed that group 1 has a higher priority than group 2. In this case, the control circuit 12 having the function as the terminal management unit of the main apparatus 1 first selects the cordless group 1 having the highest priority based on the setting information in the terminal group management table 14C shown in FIG. A control signal is transmitted to the telephone devices 21 and 22 so as to perform an empty slot search process. The formation and transmission of the control signal is performed by the corresponding control signal processing unit 32 of the circuit LSI unit 13 according to the control of the control circuit 12.

  In this case, as shown in FIG. 8B, the cordless telephone device 21 and the cordless telephone device 22 execute the empty slot search process at almost the same timing, so the first collision (collision 1) occurs. However, one of the cordless telephone devices can acquire an empty slot as a traffic bearer. For example, as shown in FIG. 8B, it is assumed that the cordless telephone device 21 can acquire an empty slot as a traffic bearer. In this case, the cordless telephone device 22 that could not acquire the traffic bearer performs a retry process, but only the cordless telephone device 22 performs an empty slot search process. An empty slot can be immediately acquired as a traffic bearer.

  Then, the control circuit 12 of the main device 1 transmits a control signal to the cordless telephone devices 23 and 24 of the group 2 having low priority so as to perform an empty slot search process at a predetermined interval. The formation and transmission of the control signal is also performed by the corresponding control signal processing unit 32 of the circuit LSI unit 13 according to the control of the control circuit 12. It should be noted that the above-mentioned predetermined interval, that is, the interval of the incoming notification timing, which is opened in order to start the search process for empty slots in units of groups, is not less than the interval of carrier sense. In this example, since the carrier sense interval is 100 ms (milliseconds), after instructing the cordless telephone apparatuses 21 and 22 of group 1 to start the search process of empty slots, group 2 Are instructed to start empty slot search processing.

  Here, the carrier sense is a process of grasping the usage status of the slot of the channel used by the own device in each of the cordless telephone devices accommodated in the main device 1, for example, the parent device. Specifically, the base units BS1 to BSn of the cordless telephone apparatuses 21 to 2n receive the supply of the reception signal from the wireless communication unit 443, and detect the use status of the slot in the link of the channel used by the own unit. That is, base units BS1 to BSn have a carrier sense unit, and by using the timing signal and clock signal from PLL unit 4421, how many slots are used in the link of the channel used by the own unit. Can be detected.

  The execution period of this carrier sense is 100 ms in the cordless telephone apparatuses 21 to 2n of this embodiment. Note that the predetermined interval is not limited to 100 ms, and may be an appropriate interval of 100 ms or more. For example, 120 ms, 150 ms, 200 ms, and the like can be determined in consideration of the number of cordless telephone devices accommodated in the main device 1, the number of cordless telephone devices constituting each group, the time required for retry processing, and the like. .

  As shown in FIG. 8B, in the group 2 as well, the cordless telephone device 23 and the cordless telephone device 24 execute the empty slot search process at almost the same timing, so the next collision (collision 2) is Occur. However, one of the cordless telephone devices can acquire an empty slot as a traffic bearer. For example, as shown in FIG. 8B, it is assumed that the cordless telephone device 23 can acquire an empty slot as a traffic bearer. In this case, the cordless telephone device 24 that could not acquire the traffic bearer performs a retry process, but only the cordless telephone device 24 performs a search process for an empty slot. An empty slot can be immediately acquired as a traffic bearer.

  Accordingly, in the case of the example shown in FIG. 8B, the collision occurs only twice in the search process for the empty slot. Compared to the case of FIG. In addition, the traffic bearer can be efficiently acquired because the traffic bearer can be acquired even by the cordless telephone apparatus that has performed the retry processing in the retry processing after the collision has occurred.

  Further, the advantages of grouping cordless telephone devices will be further considered. As described with reference to FIG. 8B, the cordless telephone devices 21, 22, 23, and 24 are divided into groups 1 and 2, and as shown in FIG. Is in a state where it is being used for a call. In this case, it is assumed that a simultaneous incoming call occurs, the group 1 is notified of the incoming call first, and the group 2 is notified of the incoming call after 100 ms.

  In the group 1, only the cordless telephone device 22 performs the empty slot search process. Therefore, the specific collision of the empty slots in the search process does not occur, and the cordless telephone device 22 immediately sets the empty slot as a traffic bearer. You can get it. Thereafter, the cordless telephone devices 23 and 24 of group 2 are notified of the incoming call.

  In group 2, as shown in FIG. 8C, the cordless telephone device 23 and the cordless telephone device 24 execute the empty slot search process at almost the same timing, so the first collision (collision 1) occurs. . However, one of the cordless telephone devices can acquire an empty slot as a traffic bearer. For example, as shown in FIG. 8C, it is assumed that the cordless telephone device 23 can acquire an empty slot as a traffic bearer. In this case, the cordless telephone device 24 that could not acquire the traffic bearer performs a retry process, but only the cordless telephone device 24 performs a search process for an empty slot. An empty slot can be immediately acquired as a traffic bearer.

  Therefore, in the case of the example shown in FIG. 8C, the collision occurs only once in the search process for the empty slot. That is, when there is a cordless telephone device used for a call, it is possible to more efficiently search for an empty slot and acquire a traffic bearer.

  Here, the processing when the cordless telephone devices 21, 22, 23, and 24 accommodated in the main device 1 described in FIG. 8B are divided into two groups and the connection timing is shifted is shown in FIG. This will be described with reference to a sequence diagram. FIG. 9 is a sequence diagram of the processing described with reference to FIG.

  As shown in FIG. 9, it is assumed that a simultaneous incoming call occurs in the main apparatus 1. In the case of this example, the control circuit 12 as the terminal management unit of the main apparatus 1 notifies the incoming call according to the management information of the terminal group management table 14C of the aspect shown in FIG. Identify cordless telephone devices. In the case of the example shown in FIG. 5C, the cordless telephone devices belonging to the group 1 having a high priority are the cordless telephone devices 21 and 22. For this reason, the control circuit 12 of the main device 1 first sends LED data (incoming notification) instructing the base units BS1 and BS2 of the cordless telephone devices 21 and 22 to blink the LED for notifying the occurrence of an incoming call. Send.

  Each of the parent devices BS1 and BS2 of the cordless telephone devices 21 and 22 blinks the LED for notification of incoming call of the own device according to the LED data from the main device 1. Next, each of the parent devices BS1 and BS2 of the cordless telephone apparatuses 21 and 22 that have received the LED data transmits a data session connection request through the dummy bearer to the corresponding child devices HS1 and HS2. Thus, the data session connection request is transmitted because it is necessary to establish (connect) a so-called data session in order to send data.

  Thereafter, each of base units BS1 and BS2 transmits LED data (incoming notification) instructing blinking of the LED for notifying of the occurrence of an incoming call through the dummy bearer to the corresponding slave units HS1 and HS2. . In response to this, as described above, slave units HS1 and HS2 perform slot search processing to acquire empty slots as traffic bearers, dummy bearers perform release merge processing, and start incoming calls to their own devices. Let In this case, as described with reference to FIG. 8B, the slave units HS1 and HS2 can acquire the traffic bearer only in one of the slave units in the first search process. However, the slave unit that could not acquire the traffic bearer can reliably acquire the traffic bearer through the retry process. In this way, the cordless telephone apparatuses 21 and 22 are ready to respond to incoming calls.

  Next, LED data (incoming call notification) is transmitted to the base units BS3 and BS4 of the cordless telephone devices 23 and 24 belonging to the group 2. As shown in FIG. 9, the timing for transmitting the LED data (incoming call notification) to the cordless telephone devices of group 2 is as shown in FIG. This is a point 100 ms after LED data (incoming call notification) is transmitted.

  Each of the parent devices BS1 and BS2 of the cordless telephone devices 23 and 24 blinks its own LED for notifying incoming calls according to the LED data from the main device 1. Next, each of the parent devices BS3 and BS4 of the cordless telephone devices 23 and 24 that have received the LED data transmits a data session connection request to the corresponding child devices HS3 and HS4 through the dummy bearer.

  Thereafter, each of base units BS3 and BS4 transmits LED data (incoming call notification) instructing blinking of the LED for notifying the occurrence of incoming call through the dummy bearer to the corresponding slave units HS3 and HS4 of its own unit. . In response to this, the slave units HS3 and HS4, as described above, perform slot search processing to acquire empty slots as traffic bearers, dummy bearers perform release merge processing, and start incoming calls to their own devices. Let In this case, as described with reference to FIG. 8B, the slave units HS3 and HS4 can acquire the traffic bearer only in one of the slave units in the first search process. However, the slave unit that could not acquire the traffic bearer can reliably acquire the traffic bearer through the retry process. In this way, the cordless telephone devices 23 and 24 are also ready to respond to incoming calls.

  As described above, the main device 1 divides the four cordless telephone devices 21, 22, 23, and 24 accommodated in the own device into two groups, and shifts the notification timing of incoming calls. As a result, in the search process for empty slots, the collision of cordless telephone devices that attempt to acquire the same empty slot is minimized, and the empty slot is acquired as a traffic bearer quickly and surely, so that incoming calls can be answered. Can be arranged. In the cordless telephone devices 21, 22, 23, and 24 that are ready to respond to incoming calls, when the user performs an incoming call response operation (off-hook operation), the telephone line is connected through the acquired traffic bearer. To be able to make a call.

[Specific examples of grouping cordless telephone devices]
In the main apparatus 1, as described with reference to FIG. 5, the cordless telephone apparatuses 21, 22, 23, and 24 are grouped and managed by the terminal group management table 14C. The terminal group management table 14C is updated at an appropriate timing based on the management information in the terminal response count table 14B.

  That is, FIG. 10 is a diagram for describing a specific example of the update process of the terminal group management table 14C. In the main device 1, when a simultaneous incoming call or a group incoming call occurs and a response operation is performed on the cordless telephone device and a call is made, it is possible to grasp which cordless telephone device has performed the response operation. For this reason, every time a simultaneous incoming call or a group incoming call occurs and a response operation is performed on the cordless telephone device and a call is made, the control circuit 12 updates the corresponding column of the terminal-specific response count table 14B of the terminal management table unit 14. .

  Then, as shown in FIG. 10A, it is assumed that the response counts of the cordless telephone apparatuses 21, 22, 23, and 24 are updated in the terminal response count table 14B. In this case, the control circuit 12 groups the cordless telephone apparatuses 22 and 23 with a large number of responses in the terminal group management table 14C based on the management data in the terminal response count table 14B as shown in FIG. The cordless telephone devices 21 and 24 with a small number of responses are distributed to group 2.

  Thereafter, the control circuit 12 reviews the grouping of the terminal group management table 14C based on the terminal-specific response count table 14B after 10 simultaneous incoming calls or group incoming calls, for example. Assume that the terminal-specific response count table 14B after 10 simultaneous incoming calls or group incoming calls has changed from the state shown in FIG. 10A to the state shown in FIG. 10C. In this case, as shown in FIG. 10D, the control circuit 12 distributes the cordless telephone devices 22 and 24 with a high response count to the group 1 in the terminal group management table 14C, and the cordless telephone devices 21 and 24 with a low response count. 23 is assigned to group 2.

  In the case of this example, the grouping of the cordless telephone device 23 and the cordless telephone device 24 has been reviewed as can be seen by comparing FIG. 10B and FIG. In this way, by reviewing the grouping in the terminal group management table 14C at an appropriate timing, it is possible to distribute cordless telephone devices with a large number of responses to high priority groups. Therefore, a cordless telephone apparatus with a large number of responses can preferentially acquire a traffic bearer, and can quickly prepare for a call.

  Here, although the terminal group management table has been described as being reviewed after 10 simultaneous incoming calls or group incoming calls have occurred, the present invention is not limited to this. The timing for reviewing the terminal group management table can be determined according to the number of occurrences of simultaneous incoming calls or group incoming calls, such as after 20 incoming calls or group incoming calls or after 30 incoming calls. It is also possible to determine the timing for reviewing the terminal group management table on the basis of the number of days, day of the week, date, etc., such as once a day, once every two days, every Wednesday and Friday, and the day with 5 every month. .

  Also, the number of cordless telephone devices belonging to each group can be varied. For example, when a person in charge who receives a call is determined, only the cordless telephone device used by the person in charge is fixedly belonging to group 1, and the other plural cordless telephone devices are group 2, group 3. It is also possible to sort them.

[Timing control of main device 1]
Next, a specific example of processing at the time of simultaneous incoming calls performed by the main apparatus 1 of the wireless communication system of this embodiment will be described with reference to the flowchart of FIG. FIG. 11 is a flowchart for explaining processing at the time of simultaneous incoming calls executed by main apparatus 1. The process of the flowchart shown in FIG. 11 is executed by the control circuit 12 of the main apparatus 1 when a simultaneous incoming call occurs in the main apparatus 1.

  Then, the control circuit 12 first refers to the terminal operation state management table 14A of the terminal management table unit 14 and determines whether or not there is a cordless telephone device (terminal) in a standby state as a destination (step S101). ). Assume that in the determination processing in step S101, it is determined that there is no cordless telephone device as a destination, for example, all cordless telephone devices are in use (during a call). In this case, a busy notification process for transmitting a busy sound to the other party is executed (step S102), and the busy notification process is terminated when the other party that is the caller goes on-hook and disconnects the line. The process shown in FIG.

  When it is determined in the determination process in step S101 that there is an incoming call destination, the control circuit 12 initializes a variable (priority variable) P for specifying a group that notifies the incoming call to 0 (zero) (step S103). Note that the priority order variable P is an integer and corresponds to the value 1 or 2 of the group 1 and group 2. In this embodiment, the priority is higher as the priority variable is smaller. Therefore, group 1 has a higher priority than group 2, and group 2 has a higher priority than group 3.

  After the process of step S103, the control circuit 12 determines whether or not there are a plurality of cordless telephone devices as destinations based on information in the terminal operation state management table 14A of the terminal management table unit 14 (step S103). S104). If it is determined in the determination process in step S104 that there are not a plurality of cordless telephone devices to be called, that is, there is only one cordless telephone device that is waiting, only one cordless telephone device that is waiting is included. An incoming call is notified (step S105).

  When it is determined in the determination process in step S104 that there are a plurality of cordless telephone devices that are destinations, the control circuit 12 adds 1 to the priority variable P (step S106), and the terminal group management table 14C The cordless telephone apparatus (terminal) belonging to the P th group is notified of the incoming call (step S107). That is, when the priority variable P is 1, the incoming call is notified to the cordless telephone devices belonging to the group 1. Then, after the incoming call notification processing in step S105 and step S107, the control circuit 12 receives an incoming call response from the cordless telephone device that has notified the incoming call (step S108). Thereafter, the control circuit 12 determines whether or not an incoming call response from the cordless telephone apparatus that has notified the incoming call has been received (step S109).

  Assume that it is determined in the determination process in step S109 that an incoming call response from the cordless telephone apparatus that has notified the incoming call has been received. In this case, the control circuit 12 controls the corresponding circuit of the line LSI unit 13 so that the telephone line can be connected between the caller and the cordless telephone apparatus that has made an incoming call so that a call can be made. (Step S110). Thereafter, when the caller or the cordless telephone apparatus that has made an incoming call response is on-hooked and the call is terminated, the control circuit 12 executes predetermined termination processing such as releasing the connected call line (step S111). ), The process shown in FIG.

  Also, assume that it is determined in the determination process in step S109 that an incoming call response from the cordless telephone apparatus that has notified the incoming call is not accepted. In this case, the control circuit 12 determines whether or not the incoming call is continued (step S112). If it is determined that the incoming call is not continued, the control circuit 12 proceeds to the process of step S111 and releases the communication line that has accepted the incoming call. A predetermined end process is executed (step S111), and the process shown in FIG.

  If it is determined in step S112 that the incoming call continues, the control circuit 12 determines whether the priority order variable P is 0 (zero) or a value indicating the last group ( Step S113). If it is determined in step S113 that the priority order variable P is 0 (zero) or a value indicating the last group, there is no other cordless telephone apparatus that should notify the incoming call. Repeat the process. As a result, it is possible to continuously accept an incoming call response from a cordless telephone device that has already notified the incoming call.

  If it is determined in step S113 that the priority variable P is not 0 (zero) or a value indicating the last group, there is another group to be notified of the incoming call. The processing from S104 is repeated. As a result, the priority that has not yet been notified of the incoming call can notify the next group of the incoming call and wait for the incoming call response.

  In this way, the main apparatus 1 of this embodiment performs the collision of the cordless telephone apparatuses that can share the same empty slot with a plurality of cordless telephone apparatuses by performing the cordless telephone apparatus that notifies the incoming call for each group. I try to reduce it.

  It should be noted that the specific example of the processing at the time of simultaneous incoming calls performed by the main device 1 shown in FIG. 11 is merely an example, and various methods for shifting the notification timing of incoming calls for each group of cordless telephone devices may be used. it can.

  Further, here, the processing in the case of simultaneous incoming calls has been described, but the same processing can be performed even in the case of so-called group incoming calls. That is, a plurality of cordless telephone devices belonging to a group that is a target of group incoming calls are classified into a plurality of groups that perform incoming call notification, and control is performed so that the timing of incoming call notification is shifted for each group that performs the incoming call notification. .

[Effect of the embodiment]
The main device 1 of the wireless communication system according to this embodiment performs grouping on a plurality of cordless telephone devices accommodated in its own device, and notifies incoming calls in units of groups. As a result, when searching for an empty slot, it is possible to avoid a collision between cordless telephone devices in which a plurality of cordless telephone devices share the same empty slot, and to perform a traffic bearer acquisition process quickly and appropriately. The

  In the wireless communication system according to the above-described embodiment, each cordless telephone apparatus first receives an incoming call notification through a dummy bearer between the parent device and the child device, and releases the dummy bearer after obtaining the traffic bearer. The merge process is performed. Thereby, since the released dummy bearer can be used as an empty slot, a limited number of slots can be effectively used and traffic bearers can be easily acquired.

  However, as described above, when acquiring a traffic bearer, two slots of a dummy bearer and a traffic bearer are temporarily used. However, when sending data such as incoming notifications simultaneously to multiple wireless terminals such as simultaneous incoming calls or group incoming calls, the timing of empty slot search processing performed by each cordless telephone device by shifting the data transmission timing And by avoiding a situation where the master unit uses two slots of a dummy bearer and a traffic bearer, it is possible to prevent an empty slot acquisition error and to prevent a retry from occurring.

  That is, by changing the transmission timing of data such as notification of incoming calls to the cordless telephone device, it is possible to reduce the collision of the cordless telephone device that the slot acquired as the traffic bearer suffers. Therefore, the effect of the merge process for efficiently using the slots can be further increased.

[Modifications, etc.]
In this embodiment, the description has been made assuming that there are four cordless telephone devices housed in the main device 1, but the present invention is not limited to this. When there are two or more cordless telephone devices accommodated in the main device 1, by applying the present invention, it is possible to avoid a collision of the cordless telephone devices in which a plurality of cordless telephone devices are in a state of holding the same empty slot, Traffic bearer acquisition processing can be performed quickly and appropriately.

  In the above-described embodiment, the four cordless telephone devices mainly used as the main device 1 have been described as being divided into two groups of two, but the present invention is not limited to this. For example, the number of cordless telephone devices distributed to each group can be made different, such as dividing into one group and three groups. That is, fewer cordless telephone devices are assigned to groups with higher priority, and more cordless telephone devices can be assigned to groups with lower priority than groups with higher priority. In this way, a cordless telephone apparatus with a high priority can preferentially acquire a traffic bearer.

  Therefore, it is not always necessary to assign a plurality of cordless telephone devices to one group. If there are few cordless telephone devices accommodated in the main device 1, the timing for notifying incoming calls may be shifted for each cordless telephone device. Good.

  In the above-described embodiment, the grouping is performed according to the number of times the cordless telephone device responds to the incoming call. However, the present invention is not limited to this. For example, when a person in charge who answers a call is determined, a cordless telephone device used by the person in charge can be fixedly assigned to a group having a high priority.

  In addition, attendance and attendance data can be used for grouping cordless telephone devices in the main device 1. For example, the time card device and the main device 1 are connected so that time stamp data for each person in charge from the time card device can be input to the main device 1. The main device 1 registers which user will use each cordless telephone device accommodated in its own device. Cordless telephone devices used by users who have been stamped at work are assigned to higher priority groups, and cordless telephone devices used by users who are not stamped at work (priority absent) are given priority. It can be assigned to a lower ranking group. Further, when linked with the time and attendance data, the cordless telephone device used by the user whose return time has been imprinted can be reassigned to a low priority group.

  In the above-described embodiment, the processing was mainly performed at the time of incoming call, but is not limited to this. For example, during busy periods, it is considered that there is a possibility that a call (calling) operation for making a call is performed almost simultaneously using a plurality of cordless telephone devices accommodated in the main device 1. In this case, when a transmission operation is performed on the cordless telephone device, the cordless phone transmits a call request to the parent device through the dummy bearer, and the parent device sends a call request from the cordless handset to the main device 1. To do.

  Therefore, when receiving a call request from a plurality of cordless telephone devices accommodated in its own device at once, the control circuit 12 of the main device 1 divides each cordless telephone device into a plurality of groups as in the case of an incoming call. The traffic bearer acquisition process is performed on a group basis. In this way, even if a plurality of cordless telephone devices perform a call operation at the same time, the traffic bearers can be efficiently and appropriately acquired in each cordless telephone device.

  In order to efficiently perform traffic bearer acquisition processing at the time of transmission, a terminal-specific transmission frequency table for managing the number of transmissions for each terminal is provided in the terminal management table unit 14 of the main device 1. Then, according to the number of outgoing calls for each terminal, cordless telephone devices with a higher number of outgoing calls may be assigned to a group with a higher priority, and cordless telephone devices with a lower outgoing number may be assigned to a group with a lower priority. That is, similarly to the terminal group management table 14C for incoming call notification shown in FIG. 5C, a terminal group management table for outgoing calls corresponding to the number of outgoing calls is provided, and the traffic bearer at the time of outgoing calls is set accordingly. The start timing of the acquisition process can be controlled to be different.

  Of course, as for the terminal group management table for outgoing calls, cordless telephone devices that frequently make calls can be fixedly set to a high priority group. That is, the terminal group management table for outgoing calls can be modified in the same manner as the terminal group management table for incoming calls.

  Thus, in the invention according to this application, a plurality of cordless telephone devices accommodated in a main device (higher-level device) such as simultaneous incoming calls, group incoming calls, and simultaneous outgoing calls can simultaneously transmit traffic bearers according to instructions from the main device. The present invention can be applied to various cases where the acquisition process is performed. That is, when the main apparatus 1 transmits instruction data corresponding to an instruction to acquire a traffic bearer to a plurality of cordless telephone apparatuses mainly operated by itself, the main apparatus 1 is provided for each cordless telephone apparatus or a plurality of cordless telephone apparatuses. The transmission timing of the instruction data is shifted for each group formed by sorting the cordless telephone devices. As a result, it is possible to efficiently acquire a traffic bearer, and it is possible to prepare an environment in which communication through a cordless telephone device can be performed appropriately and reliably at all times.

  Further, in the above-described embodiment, the description has been given on the assumption that the host device (communication management device) in the wireless communication system is the main device. However, the host device includes various devices such as a SIP server that accommodate a terminal device such as a cordless telephone device and perform connection / disconnection control of a telephone line in a wireless communication system.

[Others]
As can be seen from the above-described embodiment, the function of the storage means of the host device is realized by the terminal operation state management table 14A of the terminal management table unit 14 of the main device 1, and the function of the discrimination means of the host device is The control circuit 12 of the device 1 is realized. Further, the function of the control means of the host device is realized by the control circuit 12 of the main device. The function of the group storage means of the host device is realized by the terminal group management table 14C of the terminal management table unit 14 of the main device 1. In addition, the function of the incoming number storage means of the host device is realized by the terminal response count table 14B of the terminal management table unit 14 of the main device 1, and the function of the host device update means is realized by the control circuit 12 of the main device 1. Realized. The function of the second control means of the host device is realized by the control circuit of the main device 1.

  Further, the processing shown in the flowchart shown in FIG. 11 corresponds to an embodiment of the communication control method. A program (software) for executing the processing of the flowchart shown in FIG. 11 corresponds to an embodiment of the communication control program.

DESCRIPTION OF SYMBOLS 1 ... Main apparatus, 12 ... Control circuit (terminal management part), 14 ... Terminal management table part, 14A ... Terminal operation state management table, 14B ... Terminal response frequency table, 14C ... Terminal group management table, 21-2n ... Cordless Telephone device, BS1 to BSn ... Base unit, HS1 to HSn ... Slave unit, 41 ... Control circuit, 42 ... Line LSI unit, 43 ... Synchronization signal generation circuit, 44 ... Wireless communication circuit, 441 ... Control unit, 442 ... TDMA modulation / demodulation 443 ... Wireless communication unit 51 ... Wireless communication circuit 52 ... Control circuit 53 ... Codec circuit 511 ... Control unit 512 ... TDMA modulation / demodulation unit 513 ... Wireless communication unit

Claims (4)

A plurality of cordless telephone devices composed of a parent device and a child device are connected to the host device, and the unit communication period is divided into a plurality of slots between the parent device and the child device. In each of the communication to the slave unit and the communication from the slave unit to the master unit, one of the plurality of slots is used to perform TDMA (Time Division Multiple Access) / TDD (Time Division Duplex). (Time Division Duplex) A wireless communication system in which the cordless telephone apparatus performs a process of searching for and specifying an empty slot used by the slave unit for communication in accordance with an instruction from the master unit. A host device of a communication system,
Storage means for storing information indicating the operation state of each of the plurality of cordless telephone devices connected to the device;
When an incoming call to be notified to a plurality of cordless telephone devices occurs, it is determined whether or not there are a plurality of cordless telephone devices in a standby state capable of responding to the incoming call based on the stored information of the storage means. Discrimination means;
When the determination means determines that there are a plurality of the cordless telephone devices in a standby state capable of responding to an incoming call, the notification timing of the incoming calls to the plurality of cordless telephone devices in a standby state capable of responding to the incoming call is shifted. Control means to control ,
Group storage means for storing identification information of a plurality of cordless telephone devices for each of a plurality of groups having different execution timings of search processing of slots used for a call;
With
The high-order apparatus of a wireless communication system, wherein the control means performs control so as to shift an incoming notification timing for each group managed by the group storage means. The host device according to claim 1 ,
A number of incoming calls storage means for storing the number of incoming calls for each of the plurality of cordless telephone devices;
Updating means for updating the identification information of the cordless telephone apparatus having a large number of incoming calls so as to be recorded in a high priority group of the group storage means in accordance with the number of incoming calls for each cordless telephone apparatus in the incoming number storage means. And
The high-order apparatus of the radio | wireless communications system characterized by the above-mentioned control means controlling to notify an incoming call from the group with a high priority first. A plurality of cordless telephone devices composed of a parent device and a child device are connected to the host device, and the unit communication period is divided into a plurality of slots between the parent device and the child device. In each of the communication to the slave unit and the communication from the slave unit to the master unit, one of the plurality of slots is used to perform TDMA (Time Division Multiple Access) / TDD (Time Division Duplex). (Time Division Duplex) A wireless communication system in which the cordless telephone apparatus performs a process of searching for and specifying an empty slot used by the slave unit for communication in accordance with an instruction from the master unit. A host device of a communication system,
Storage means for storing information indicating the operation state of each of the plurality of cordless telephone devices connected to the device;
When an incoming call to be notified to a plurality of cordless telephone devices occurs, it is determined whether or not there are a plurality of cordless telephone devices in a standby state capable of responding to the incoming call based on the stored information of the storage means. Discrimination means;
When the determination means determines that there are a plurality of the cordless telephone devices in a standby state capable of responding to an incoming call, the notification timing of the incoming calls to the plurality of cordless telephone devices in a standby state capable of responding to the incoming call is shifted. Control means to control ,
A second control unit configured to control to shift a provision timing of a search instruction for an empty slot to the plurality of cordless telephone apparatuses that have generated the transmission requests when a transmission request is generated from the plurality of cordless telephone apparatuses; A host apparatus of a wireless communication system . The host device according to claim 1 , claim 2, or claim 3 ,
When the master unit of the plurality of cordless telephone devices receives an incoming call notification, the control means shifts the notification timing of the incoming call more than an execution interval of an empty slot search process performed in the cordless telephone device. An upper apparatus of a wireless communication system characterized by the above.

Images