JP2008258859A - Radio telephone system with channel automatic setting function - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio telephone system wherein a proper speech channel free from radio interference is automatically set. <P>SOLUTION: A main device 10 instructs wireless master units 20-1 to 20-5, in order, to switch to a continuous reception mode of measuring intensities of reception radio waves from master units of one another, and each master unit informs the main device 10 of a measurement result, and the main device 10 assigns speech channel candidate groups to respective master units on the basis of measurement results, and each master unit reduces priorities of channels adjacent to a channel being used at present and channels which have caused interference. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a radiotelephone system having a radio channel automatic setting function capable of suppressing radio wave interference between radiotelephones.

  Conventionally, in order to suppress radio wave interference between radio telephones, a call is made based on the physical installation positions of a plurality of radio master units connected to the main unit and identification codes assigned to the radio master units individually. It is usual to set the channel manually, and it takes a lot of trouble to set the channel. As an improvement measure for this, there has been a technique for prohibiting a call channel that affects the control channel based on information on the call channel to be used (for example, Patent Document 1).

Japanese Patent No. 2777995

  However, in the above prior art, the communication channel is not taken into consideration, and the channel adjacent to the channel being used in the vicinity of the wireless master unit in communication is designated by another wireless master device and communication is started. In such a case, there is a drawback in that radio wave interference occurs and the call quality deteriorates.

  Therefore, the object of the present invention is to notify the main device of the information at the time of radio wave interference, feed back the radio wave interference information so that the call channel is not designated in subsequent calls, and an appropriate call channel is automatically set. It is to provide a wireless telephone system to be set.

  One or a plurality of channels for controlling outgoing / incoming calls or the like by a telephone device comprising one or a plurality of radio master units connected to an exchange and one or a plurality of radio telephone slave units radio-connected to the radio master unit In the radio telephone system, which is composed of a plurality of channels for making a call and designates a channel for making a call according to an instruction from the radio master unit, the radio master unit notifies the main unit of the channel used for the call. The main device has a notification means for notifying the wireless master unit of the channel to be used, and notifies the optimized channel in the same system from the main device to the wireless master device. Thus, the generation of interference waves between a plurality of wireless master units is suppressed.

  In addition, the present invention notifies the exchange that the communication channel used in the wireless master unit interferes with the communication channel used by another wireless master device and channel switching is started, and the information Based on the above, it is characterized in that the switchboard automatically sets the optimized channel to be used in the wireless master unit.

  Further, the present invention receives a signal transmitted by one or a plurality of channels for controlling outgoing / incoming calls and the like, and notifies the main device of the radio field intensity. A radio telephone system characterized in that, based on the information, the exchange notifies the radio base unit of the optimized channel to be used.

  According to the present invention, even when an incomplete call channel with respect to radio wave interference is automatically set, the radio interference information is notified to the main unit and reflected in the subsequent call channel designation. It is possible to provide a wireless telephone system that can reduce radio wave interference, which is a cause of deterioration in call quality, without taking time and effort.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an overall configuration diagram of a radiotelephone system according to the present invention. In FIG. 1, the main apparatus 10 accommodates one or a plurality of external lines 16 in an external line unit 11, and a plurality of wireless master units 20 (hereinafter abbreviated as “master unit 20”) in an extension unit 15. The installation location of the parent device 20 is managed by the accommodation positions 101 to 105 in the extension unit 15 which are physical connection points when the parent device 20 is accommodated. Note that the base unit 20 is a wireless base station for a local cordless phone such as a PHS or a wireless access point for a wireless LAN terminal.

  Further, the wireless slave unit 30 (hereinafter, abbreviated as the slave unit 30) can communicate with the outside line through the master unit 20 or between the slave units or through the outside line unit. The handset 30 is a local cordless phone such as a PHS or a mobile phone such as a wireless LAN phone. The exchange processing unit 12 performs exchange connection of the voice communication path between the outside line unit 11 and the extension unit 15 or within the extension unit 15 according to an instruction from the control unit 13. The base unit management unit 14 manages the number of base units 20 and the communication channel of each base unit 20 by wireless communication. The control unit 13 performs line switching processing for the external line 16 and the internal line 26 and controls the main apparatus 10 as a whole.

  FIG. 2 is a block diagram of the base unit 20. In FIG. 2, the master unit 20 is connected to the main unit 10 via a line cable 26, and channel information and voice data used for wireless communication with the slave unit 30 are transmitted to the main unit 10 via the extension interface 21. The control unit 23 controls the extension interface 21, the voice processing unit 22, the transmission / reception unit 24, and the channel management unit 25. The audio processing unit 22 processes audio signals of the extension interface 21 and the transmission / reception unit 24. The transmission / reception unit transmits / receives audio data to / from the slave unit 30 by wireless communication according to an instruction from the control unit 23. The channel management unit 25 manages a reception list of another wireless master unit (for example, 20-2) measured by the own base unit (for example, 20-1) and a call channel candidate set by the main apparatus 10.

  FIG. 3 is an operation flowchart of the main apparatus 10 that collects received radio wave intensity data of each parent device 20. This flow is activated when it is necessary to measure the radio wave interference state of a wireless communication channel, such as when a new base unit 20 is added. Hereinafter, as shown in FIG. 1, the first parent device 20-1 connected to the accommodation position 101, the second parent device 20-2 connected to the accommodation position 102, and the third master device connected to the accommodation position 103. An example of the parent device 20-3, the fourth parent device 20-4 connected to the accommodation position 104, and the fifth parent device 20-5 connected to the accommodation position 105 will be described.

  First, base unit 20 (for example, base unit 20-1 connected to accommodation position 101) for starting radio wave measurement first is designated (S100), and continuous reception for measuring the radio field intensity from other base units. The start of the mode is instructed (S101). Thereafter, after waiting for the measurement result from the designated master device 20 and receiving the measurement result (S102, Yes), the received data is stored in the channel management unit 25 (S104), and the next master device 20 is designated ( S106), the process returns to S101. If the measurement result cannot be received from the parent device 20 even after a predetermined time has elapsed (S103, Yes), the process proceeds to S105. Measurement is completed for all the parent devices 20-1 to 20-5 (S105, Yes), and this flow is completed.

  FIG. 4 is an operation flowchart of each parent device 20 corresponding to FIG. When the main device 10 is instructed to start the continuous reception mode (S200), the control unit 23 of the parent device 20 controls the transmission / reception unit 24 and normally transmits at a fixed interval on the control channel. Is stopped, and a radio wave channel having a frequency at which measurement is started is set (S201). Thereafter, the timer is started (S202), the continuous reception mode is started, and the received radio wave intensity from the other parent device 20 received by the channel of the frequency is measured (S203). Then, after measuring for a certain time (S204, Yes), the measured received radio wave intensity data is stored in the channel management unit 25 together with the identification code of the radio base station that is the source of the radio wave (S205). If measurement has not been completed for all channels (S206, No), the measurement channel of the next frequency is set (S207), and the process returns to S202.

If the measurement is completed for all channels (S206, Yes), the base unit 20 stores the measurement result list of received radio wave intensity data corresponding to the identification codes of the other base units stored in the channel management unit 25. After transmission to the main apparatus 10 (S208), the continuous reception mode is canceled (S209), and this flow is completed.
Although not described in this flow, after canceling the continuous reception mode (S209), the base unit resumes transmission of the identification code of the base unit transmitted at a constant interval on the control channel. The outgoing radio wave from the base unit including the identification code of the base unit is measured by another base unit 20.

FIG. 5 shows an example of the radio wave arrival area of the parent device 20 connected to the accommodation positions 101 to 105 of the extension unit 15 shown in FIG. A range surrounded by a circle around the base unit 20 is a range that may cause radio wave interference to other base units.
In this example, the radio wave arrival areas of the parent device 20 connected to the accommodation position 101, the accommodation position 102, and the accommodation position 103 overlap. The radio wave arrival area of the master device 20 at the accommodation position 104 overlaps only with the master device 20 at the accommodation position 102. On the other hand, the master unit 20 at the accommodation position 105 is separated from other radio master units, and the radio wave arrival areas do not overlap at all. Radio base stations with overlapping radio wave coverage areas may cause radio wave interference, resulting in a deterioration in call quality.

  FIG. 6 shows the radio field strengths shown in FIGS. 3 and 4 for the master units 20-1 to 20-5 at the accommodation positions 101 to 105 shown in FIG. It is a list example of a measurement result after processing of a measurement flow. It is expressed in three levels of strong radio wave, weak radio wave, and no radio wave from the measured radio wave intensity. The radio field intensity of the other parent device 20 measured by the parent device 20 is tabulated.

  FIG. 7 is an example of a distributed distribution of speech channels (36 channels used from 1 to 82 and 221 to 255) by wireless communication that can be used by the wireless telephone system, and channels having close numerical values can cause radio wave interference. It is desirable to apply it to a base unit as far away as possible, and call channel candidates are distributed into six groups. Base unit 20 designates channels from the higher priority of the call channel candidate list.

  FIG. 8 shows the order of the groups that are preferentially assigned to the base unit 20 among the six groups in the call channel candidate list of FIG.

  FIG. 9 is an operation sequence diagram for performing automatic channel setting. This flow starts in a state where the radio field intensity measurement data of all the base units 20 shown in FIG. 6 is stored in the base unit management unit 14 in the main apparatus 10. Based on the priority order of call channel candidate group assignment in FIG. 8, a call channel candidate group is preferentially assigned to the other master unit 20 from the master unit 20 in which the number of strong radio wave master units is the largest. At this time, the allocation is performed so that every other call channel candidate group is adjacent (S300). Then, it is determined whether a call channel assignment candidate group has been assigned to all the parent devices 20 (S301). If there is an unassigned parent device 20, (S301, No), the process returns to S300, and the process is performed again. Do.

  When the assignment is completed (S301, Yes), the assigned channel candidate group is transmitted to each parent device (S302). Although not in the flow, each parent device 20 that has received the channel assignment candidate group transmitted in S302 is stored in the channel management unit 25 in each parent device. An example of a call channel candidate group whose assignment has been completed is shown in FIG.

  FIG. 11 shows an operation sequence when the master unit 20 and the slave unit 30 start communication. Base unit 20-K selects a call channel with a higher priority in the assigned call channel assignment candidate group stored in channel management unit 25 and starts a call. However, if there is already a radio wave that exceeds the carrier sense level as defined by the Radio Law, the next candidate call channel is used.

  Master unit 20-J notifies main device 10 of the communication channel used for communication with slave unit 30 (S401). The main device 10 stores in-use call channel information notified from the base unit 20-J in the base unit management unit 14 (S402), and calls the other in-use call to the base unit 20-K. The channel information is notified (S403).

  When the standby master unit 20-K notified of the used call channel information stores the information in the channel management unit 25 and the channel adjacent to the used call channel is in the candidate list, The priority of the call channel is set to the lowest (S404).

  With the above processing, the use of adjacent call channels between neighboring base units is avoided. However, during wireless communication between the parent device 20 and the child device 30, however, call quality switching due to radio wave interference may occur due to other parent devices or external radio waves, and call channel switching may be activated. Although not shown, in that case, the priority of the call channel in which the call switching has occurred among the call channel candidates stored in the channel management unit 25 of each parent device 20 may be changed to the lowest order. Also, the main device is notified of the identification information of the parent device in which the radio wave interference has occurred, and the main device 10 performs the next allocation process so that the channel used by the parent device becomes a channel with a radio frequency as far away as possible. Should be executed.

Overall configuration diagram of a radiotelephone system according to the present invention Block diagram of wireless master unit Operation flow diagram when measuring the radio field intensity of the main unit Operation flow diagram when measuring radio field strength of the wireless master unit Multiple wireless master unit radio wave area explanatory diagram Example of radio field strength measurement results for other wireless master units Examples of grouped channel candidates that can be specified in the wireless telephone system Call channel candidate group allocation priority example Call channel automatic setting operation flow chart Call channel group automatic setting result example for wireless master unit Sequence diagram after starting a call

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Main apparatus 11 External line unit 12 Exchange processing part 13 Control part 14 Master unit management part 15 Extension unit 16 Outer lines 101-105 Accommodating position 20
21 Extension interface 22 Voice processing unit 23 Control unit 24 Transmission / reception unit 25 Channel management unit 26 Extension 30 Wireless slave unit (also simply called slave unit)

Claims (3)

In a radio telephone system comprising a main device that accommodates an external line and an extension, a plurality of wireless master devices connected to the main device, and a plurality of wireless telephone slave devices wirelessly connected to the wireless master device,
The main apparatus has a radio channel designating unit for designating a specific radio channel from among a plurality of radio channels for making / receiving calls or making calls.
The wireless master unit has a busy channel notification means for notifying the main unit of a wireless channel in use,
The main device collects radio channel information in use from the plurality of radio master units, determines radio channels to be used by each radio base unit according to a predetermined rule from the radio channel information in use, and A radio telephone system having an automatic channel setting function, wherein the determined radio channel is notified to the radio base unit. The wireless telephone system according to claim 1, wherein
When the radio channel in use causes radio wave interference with other radio cell units, the radio base unit notifies the main unit of information on the radio channel that caused the radio wave interference,
The main device, based on information of the radio channel causing the radio wave interference, designates another radio channel according to a predetermined rule, and notifies the radio base unit of the designated radio channel A wireless telephone system having an automatic setting function. The wireless telephone system according to claim 1, wherein
The wireless master unit receives a radio channel signal emitted by another wireless master unit, and notifies the main device of received radio field strength information of a radio channel signal emitted by the other wireless master unit,
The main unit determines a radio channel to be used by each radio base unit according to a predetermined rule based on the received radio wave intensity information notified from the radio base unit, and determines the determined radio channel to the radio base unit. A wireless telephone system having a channel automatic setting function characterized by

Images