JP3724418B2 - Wireless communication device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
  The present invention relates to a radio communication apparatus that allocates one call channel for actually carrying out a call from a plurality of call channels and performs radio communication with a counterpart apparatus using the assigned call channel, and more particularly, to a plurality of call The present invention relates to a wireless communication apparatus capable of allocating one call channel optimum for wireless communication from among the channels and supplying good call quality.
[0002]
[Prior art]
  2. Description of the Related Art Conventionally, there is known a cordless parent / child telephone device including a parent device connected to an external line and a child device connected to the parent device via a wireless line. Regarding this cordless parent / child phone device, in Japan, 89 channels using the 250 MHz band and the 380 MHz band as a low-power cordless telephone are currently approved. Among these, 87 channels (1 channel to 45 channel and 47 channel to 88 channel) are the remaining two channels (46 channel and 89 channel) as communication channels for performing wireless communication between the parent device and the child device. Channel) is defined as a control channel used to establish a wireless link between the parent device and the child device.
[0003]
  According to this cordless master / slave phone device, the master unit sequentially determines the availability of each call channel in order to allocate one call channel for actually performing wireless communication with the slave unit from among the 87 call channels. To check. This check detects an electrolytic strength (Received Signal Strength Indicator) (hereinafter referred to as “RSSI”) of each communication channel as a communication parameter indicating the communication quality of each communication channel, and the detected RSSI is below a certain level. If there is, the call channel is set as an empty channel. Next, check if the call information from the slave unit is received on the control channel, and if there is reception information, wireless communication between the master unit and the slave unit using the empty channel checked earlier Is executed.
[0004]
[Problems to be solved by the invention]
  However, the communication quality of each of the 87 call channels is different from each other, and varies depending on the environment in which the apparatus is installed and the time at which RSSI is measured, at different rates of change. Therefore, as described above, even if the detected RSSI is equal to or lower than a certain level and is a call channel assigned as a call channel for actually performing wireless communication, other call channels include There may be a call channel that is more suitable for wireless communication than a call channel that performs wireless communication. Therefore, there has been a problem that the call quality varies depending on the call channel assigned as the call channel for performing wireless communication.
[0005]
  The present invention has been made in order to solve the above-described problems, and a wireless communication system that can allocate a single communication channel optimal for wireless communication from among a plurality of communication channels and supply a good communication quality. The object is to provide a communication device.
[0006]
[Means for Solving the Problems]
[0007]
[0008]
[0009]
[0010]
[0011]
[0012]
[0013]
  Claim1The described wireless communication apparatus allocates one call channel for actually executing a call from a plurality of call channels, and performs communication with each other apparatus using the assigned call channel to perform communication of each call channel. Communication data for indexing quality is previously detected for each call channel, and the detected data is stored as the unique data of each call channel in association with each call channel; Based on the unique data of each call channel stored in the unique data storage means, call channel extraction means for extracting at least one call channel satisfying a predetermined standard, and each of the call channels extracted by the call channel extraction meansExtractionTo indicate the communication quality of the call channel, a different type from the communication parameterAnd fluctuates at each detection and affects the communication quality rather than the communication parameters.Communication parameter detection means for detecting communication parameters;In accordance with detection data of each extracted call channel detected by the communication parameter detecting means, first point assigning means for giving a first point to each extracted call channel, and unique data stored in the unique data storage means And a second point giving means for giving a second point to each extracted call channel, and the first point and the second point given by the first point giving means and the second point giving means. Based on the total points calculated with the weighting of the first point increased,Extracted by the call channel extraction meansEach extractionCall channel assigning means for assigning one call channel for actually executing a call from the call channels is provided.
[0014]
  This claim1According to the described wireless communication apparatus, the communication parameter for indicating the communication quality of each call channel is detected in advance for each call channel. The detected data is stored by the unique data storage means in association with each call channel as unique data possessed by each call channel. Then, at least one or more call channels are extracted from the plurality of call channels by the call channel extraction means based on the unique data stored in association with each call channel. Each extractedExtractionDifferent types of communication parameters for communication channelsCommunication parameters that change at each detection and affect communication qualityIs detected by the communication parameter detecting means.Then, the first point assigning means assigns a first point to each extracted call channel according to the detection data of each extracted call channel detected by the communication parameter detecting means. Further, the second point assigning means assigns a second point to each extracted call channel according to the unique data stored in the unique data storage means. Furthermore, based on the total points calculated by increasing the weight of the first point, the first point and the second point granted by the first point giving means and the second point giving means,Each extracted by the call channel extraction meansExtractionOne call channel for actually executing a call is assigned from the call channels.
[0015]
  Claim2The wireless communication device according to claim1In the described wireless communication device, the detection data detected by the communication parameter detecting meansExtractionIncluded detection data storage means for storing in correspondence with the call channel, each of the data stored in the detection data storage meansExtractionDetection data updating means for updating the detection data of the communication channel with new detection data detected by the communication parameter detection means is provided.
[0016]
[0017]
[0018]
[0019]
[0020]
DETAILED DESCRIPTION OF THE INVENTION
  Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is an external perspective view of a cordless parent / child phone device 1 including a parent device 1a and child devices 1b to 1d connected to the parent device 1a via a wireless line 52 (see FIG. 2). It is. The base unit 1a is a communication device that performs telephone operations, facsimile operations, and transmission / reception of electronic mails with a counterpart device connected via the telephone line 26. A receiver 3 is attached to the side of the main body 2 of the base unit 1a. The handset 3 is placed on a hook (not shown) provided in the main body 2 when not talking and is picked up and used from the hook when talking.
[0021]
  An operation panel 4 having a plurality of buttons such as an input button for inputting a numerical value or a character or a command input button for inputting a command is provided on the front surface of the main body 2. A setting button 4a, which is one of command input buttons, is provided at the upper left end of the operation panel 4. The setting button 4a is a button for displaying an input screen for inputting various settings and commands on a liquid crystal display (hereinafter simply referred to as “LCD”) 5. When the setting button 4a is pressed by the operator, An input screen is displayed on the LCD 5.
[0022]
  The LCD 5 described above is provided at the center of the operation panel 4. The LCD 5 is a display that displays processing executed by the base unit 1a and a communication state between the base unit 1a and a counterpart device connected via the telephone line 26, and is configured by a touch panel. When the base unit 1a is operated by a button such as a setting button 4a or a numeric keypad 4b provided on the operation panel 4, the operation state and operation procedure are displayed on the LCD 5.
[0023]
  A document insertion slot 6 is provided at the rear of the operation panel 4 and the LCD 5. A document to be transmitted by facsimile is inserted into the document insertion opening 6 with the document surface facing downward, and after being read, is read from a document discharge opening 7 provided on the front surface of the main body 2 and below the operation panel 4. Discharged. A recording paper holder mounting portion 9 is provided at the rear portion of the document insertion opening 6, and a recording paper holder 10 capable of stacking and storing a plurality of recording papers is detachably attached to the recording paper holder mounting portion 9. ing. The recording paper supplied from the recording paper holder 10 and used for printing is discharged from a recording paper discharge port 8 provided below the document discharge port 7.
[0024]
  The main body 2 is provided with an antenna 18 (see FIG. 2) as connection means for transmitting and receiving various signals and data to and from the slave units 1b to 1d. The master unit 1 a is connected to the slave units 1 b to 1 d through the antenna 18 by a wireless line 52. A radio wave of a predetermined channel (call channel or control channel) is used as a data medium transmitted and received between the parent device 1a and the child devices 1b to 1d.
[0025]
  The base unit 1a configured as described above is configured to perform communication on any one of channels 1 to 89. Of these channels, two channels, 46 and 89, are used as control channels for establishing a wireless link, and the remaining 87 channels are used as call channels.
[0026]
  The base unit 1a regularly detects a call channel so as to be able to communicate with the handset 1b to 1d, and checks the free status of 87 call channels (free channel scanning process). Furthermore, in order to detect communication requests (command (data) transmission) from the slave units 1b to 1d, the output of the control channel to which the command related to the communication request is transmitted is detected regularly (regularly). Scanning process). The time during which the base unit 1a can transmit data by this control channel is determined to be within 4 seconds, and during this 4 seconds, data is transmitted to each of the slave units 1b to 1d connected to the base unit 1a. When data is transmitted to a plurality of slave units, the data is transmitted cyclically to each destination slave unit.
[0027]
  The subunit | mobile_unit 1b-1d is a communication apparatus provided with the antenna 33 (refer FIG. 2) for performing transmission / reception of data between the main | base stations 1a. These subunit | mobile_units 1b-1d are comprised so that it can connect to the telephone line 26 via the main | base station 1a. The external line calls from the slave units 1b to 1d are executed by transmitting a command to the master unit 1a and causing the master unit 1a to execute an operation based on the command.
[0028]
  The subunit | mobile_unit 1b-1d is provided with the operation panel 37 and LCD38 in the front surface of the housing | casing. At the center of the operation panel 37, a plurality of numeric keys 37a for inputting numerical values and characters are provided. A start key 44 is provided on the upper left side of the numeric keypad 37a. The start key 44 is a button for executing the closing and opening of the telephone line 26. When the key 44 is pressed in a line open state, the telephone line 26 is closed. At that time, a communication request is made to the base unit 1a, and the communication request is transmitted through the control channel.
[0029]
  A microphone 35 for converting an audio signal (user's utterance) into an electrical signal is provided below the housings of the slave units 1b to 1d, and the electrical signals are voiced above the housings of the slave units 1b to 1d. A speaker 36 for converting the signal is provided. Thereby, the subunit | mobile_unit 1b-1d can perform a telephone call with the calling side apparatus (other party apparatus) via the main | base station 1a or the telephone line 26. FIG.
[0030]
  Similar to the master unit 1a, the slave units 1b to 1d execute communication on any one of channels 1 to 89, and use the 46 channel and 89 channel as control channels, and the rest. The channel is used as a call channel. The presence or absence of a communication request (command (data) transmission) from the parent device 1a is confirmed by constantly checking the output of the control channel from the parent device 1a. From the parent device 1a, data to which the ID code of the entire device and the identification number of the transmission destination child device are added is transmitted. The subunit | mobile_unit 1b-1d responds with respect to the main | base station 1a only when the identification number of an own machine is added to the received data.
[0031]
  The subunit | mobile_unit 1b-1d comprised as mentioned above is installed in the charging stand 50 so that attachment or detachment is possible. The subunit | mobile_unit 1b-1d is connected to the charging stand 50 via the connector 49 (refer FIG. 2) in the state installed in the charging stand. Moreover, if the subunit | mobile_unit 1b-1d is connected to the charging stand 50 by the connector 49, it will be in an on-hook state. When it is picked up from the charging stand 50 (the connector 49 is detached from the charging stand), it enters an off-hook state. That is, when the slave units 1b to 1d are picked up from the charging stand 50, a communication request is transmitted to the master unit 1a through the control channel in order to form a closed circuit state.
[0032]
  The charging stand 50 charges the connected (installed) slave units 1b to 1d with a predetermined voltage. The charging stand 50 is connected to an external power source (not shown), and supplies power supplied from the external power source to the slave units 1b to 1d. In addition, when the subunit | mobile_unit 1b-1d exists in the state removed from the charging stand 50, a standby state (state in which only a required minimum process is performed) is inserted between the detection processes of a control channel, Reduces energy consumption. For this reason, when the subunit | mobile_unit 1b-1d is removed from the charging stand 50, the detection of the control channel in the subunit | mobile_unit 1b-1d will be performed intermittently.
[0033]
  FIG. 2 is a block diagram showing an electrical configuration of the parent device 1a and the child devices 1b to 1d. The base unit 1a includes a CPU 11, a ROM 12, a RAM 13, an EEPROM 14, a real-time clock (hereinafter simply referred to as “RTC”) 15, an audio LSI 17, a cordless unit 51, a network control unit (hereinafter simply referred to as “NCU”) 19, A modem 20, a buffer 21, a scanner 22, an encoding unit 23, a decoding unit 24, a printer 25, an operation panel 4, an LCD 5 and an amplifier 27 are provided, and these are connected to each other via a bus line 29.
[0034]
  The NCU 19 is for line control, and the master unit 1a is connected to the telephone line 26 via the NCU 19. The NCU 19 receives a call signal and various signals transmitted from the exchange and transmits a dial signal at the time of outgoing call according to the operation of the input button on the operation panel 4 of the parent machine or the operation panel 37 of the child machine to the exchange. When the telephone line 26 is closed, data communication such as transmission / reception of analog audio signals is performed. The NCU 19 is connected to the handset 3.
[0035]
  The CPU 11 controls each unit connected by the bus line 29 according to various signals transmitted / received via the NCU 19 and executes data communication such as facsimile operation and telephone operation. The ROM 12 is a non-rewritable memory that stores a control program executed by the parent device 1a, and includes a wireless communication process 12a. The wireless communication process 12a is a part of the control program, and is a process of allocating one call channel for actually executing wireless communication from 87 call channels and executing wireless communication by the call channel.
[0036]
  The EEPROM 14 is a rewritable nonvolatile memory, and the data stored in the EEPROM 14 is retained even after the power is turned off. The EEPROM 14 includes a Bit Error Rate (hereinafter referred to as “BER”) table 14a, a Signal to Noise Rate (hereinafter referred to as “SNR”) table 14b, and a first total score table 14c.
[0037]
  The BER table 14a will be described with reference to FIG. In the present embodiment, only 1 to 8 channels of 87 call channels will be described, and description of 9 channels and after will be omitted. This BER table 14a detects in advance (before product shipment) how many bits of an error there are for 1000 bits for each call channel, and stores the number of error bits in association with each call channel. . That is, the number of error bits generated in each call channel is detected as a communication parameter indicating the communication quality of each call channel, and the detected number of error bits is stored in correspondence with each call channel as unique data of each call channel. Is. Thereby, it is possible to grasp the unique communication quality of each call channel.
[0038]
  In addition, each call channel is assigned the first rank, the second rank, the third rank, and the like in order from the call channel with a small number of error bits with good communication quality based on the detected number of error bits. The For example, in FIG. 3, the first rank is assigned to one channel that has the smallest number of error bits, and the second rank is assigned to four channels that have the fewest number of error bits next to one channel. Is done. Thereafter, similarly, the third rank is assigned with 2 channels, the fourth rank with 6 channels, and the like.
[0039]
  The SNR table 14b will be described with reference to FIG. This SNR table 14b detects in advance (before product shipment) the SNR for each call channel, that is, the ratio between the signal (Signal) and noise (Roise), and the detected SNR is assigned to each call channel. It is stored in association. That is, the SNR of each call channel is detected as a communication parameter indicating the communication quality of each call channel, and the detected SNR is stored as unique data possessed by each call channel in association with each call channel. Thereby, it is possible to grasp the inherent communication quality of each call channel based on a communication parameter of a type different from the BER as the communication parameter described above.
[0040]
  In addition, each call channel is assigned a rank such as the first rank, the second rank, the third rank, and the like in order from the call channel having a good communication quality and a high SNR based on the detected SNR. For example, in FIG. 4, the first rank is assigned to one channel having the highest SNR of 40 (dB), and the second rank is assigned to five channels having the highest SNR value of 36 (dB) next to the first channel. Is done. Thereafter, similarly, the third rank is assigned with 2 channels, the fourth rank with 6 channels, and the like.
[0041]
  The first total score table 14c will be described with reference to FIG. The first total score table 14c stores the total score of the ranks of the respective call channels stored in the BER table 14a and the SNR table 14b as the first total score of each call channel, corresponding to each call channel. It is. Then, based on the first total score of each call channel, in this embodiment, the first total score of 8 points or less is checked as a call channel having communication quality that clears a predetermined standard.
[0042]
  For example, the first total score of channel 1 is the sum of 1 point given by the first place given in the BER table 14a shown in FIG. 3 and 1 point given by the first place given by the SNR table 14b shown in FIG. Two points are given as points. Accordingly, since the first total score of one channel is 8 points or less, one channel is checked as a call channel that has cleared a predetermined standard.
[0043]
  On the other hand, the first total score of channel 3 is the sum of 6 points according to the 6th place given in the BER table 14a shown in FIG. 3 and 7 points according to the 7th place given in the SNR table 14b shown in FIG. A score of 13 points is awarded. Therefore, since the first total score is 8 points or more, the three channels are checked as a communication channel that does not satisfy the predetermined standard, that is, the communication quality is not good.
[0044]
  Thus, since the quality of the communication quality of each call channel is judged based on different types of communication parameters (BER and SNR), it is possible to grasp a call channel having good communication quality with high reliability.
[0045]
  The RAM 13 is a memory for temporarily storing various types of data, and includes an extraction table 13a, an electrolytic strength (Received Signal Strength Indicator) (hereinafter referred to as “RSSI”) table 13b, and a second total score table 13c. It has. The extraction table 13a will be described with reference to FIG. The extraction table 13a is obtained by extracting the checked call channel and the first total score of the call channel on the assumption that the first total score is 8 points or less in the first total score table 14c of the EEPROM 14 described above. It is. From each call channel stored in the extraction table 13a, one call channel for actually executing wireless communication is assigned.
[0046]
  As a result, the communication quality that does not satisfy the predetermined standard from the 87 call channels in advance compared to the case where one call channel for actually performing wireless communication is assigned from 87 call channels. By excluding the call channel, one call channel that actually performs wireless communication can be assigned from the call channels that satisfy the predetermined criteria. Therefore, it is possible to assign a call channel with good communication quality efficiently. it can.
[0047]
  The RSSI table 13b will be described with reference to FIGS. This RSSI table 13b detects the RSSI for each call channel stored in the extraction table 13a, and stores the RSSI in association with each call channel. That is, the RSSI of each call channel is detected as a communication parameter indicating the communication quality of each call channel, and the detected RSSI is stored as detection data of each call channel in association with each call channel. As a result, the communication quality of each call channel stored in the extraction table 13a can be grasped based on a communication parameter of a type different from the communication parameters (BER and SNR).
[0048]
  In addition, each call channel is assigned a rank of 1st, 2nd, 3rd, etc. in order from a call channel with good communication quality and low RSSI based on the detected RSSI. For example, in the RSSI table 13b of FIG. 7, the first rank is assigned to the four channels having the lowest RSSI of 4 (μV), and the second channel is set to the second channel having the smallest RSSI of 5 (μV). The rank of the place is given. Thereafter, similarly, the third rank is assigned with 6 channels, and the fourth rank is assigned with 2 channels.
[0049]
  Further, since the RSSI of each call channel varies depending on the detection time, the RSSI of each call channel in the RSSI table shown in FIG. 7 is updated each time a new RSSI is detected as shown in FIG. Is done. For example, in the updated RSSI table shown in FIG. 8, as a result of initially detecting one channel whose RSSI was 5 (μV) again, the RSSI of one channel was 8 (μV). Is updated from 5 (μV) to 8 (μV). Similarly, the RSSI of each call channel is updated according to the re-detection result of each call channel, and a new rank is assigned to each call channel based on the updated RSSI. Thereby, it is possible to grasp a call channel having a good communication quality corresponding to the change of the RSSI of each call channel that varies depending on the detection time.
[0050]
  The second total score table 13c will be described with reference to FIG. In the second total score table 13c, the first total score of each call channel stored in the extraction table 13a and the total score of the ranks assigned to the call channels in the RSSI table 13b are assigned to each call channel. 2 Total score is stored corresponding to each call channel. The order stored in the RSSI table 13b added as the second total score is the updated (latest) one. Further, on the basis of the second total score of each call channel, the first, second, third, etc. ranks are assigned in order from the call channel having the second highest total score with good call quality. The
[0051]
  For example, in the second total score table 13c shown in FIG. 9, the second total score for one channel is the first total score of 2 points stored in the extraction table 13a shown in FIG. 6 points which is a total score with 4 points by the 4th place memorize | stored in the RSSI table 13b are provided. Thereafter, the second total score is similarly calculated for each call channel, and based on the calculated second total score, the first rank is given to one channel having the lowest second total score of 6 points. The second highest ranking is given to two channels that have the second total score of 7 points, which is the second smallest after one channel. Thus, in the second total score table 14c, the call channel assigned the first rank is assigned as a call channel for executing actual wireless communication in the call channel assignment process (see FIG. 13).
[0052]
  Therefore, since the call channel assigned as the call channel for performing actual wireless communication is assigned based on RSSI in addition to the two types of communication parameters of BER and SNR, the best communication quality is selected from a plurality of call channels. A call channel can be assigned.
[0053]
  Also, the decrypted facsimile data is temporarily stored in a predetermined area of the RAM 13. The stored facsimile data is then output to the printer 25. The output facsimile data is erased from the RAM 13 after being printed on the recording paper by the printer 25. When the facsimile data is image data, the amount of data is generally large, but since the facsimile data is deleted on condition that the facsimile data is printed, the RAM 13 can be used effectively. .
[0054]
  The RTC 15 is an IC that measures the date, day of the week, hour, minute, and second. The received date and time data is added to the received facsimile data and the like based on the value of the RTC 15 so that management based on the reception time can be performed. Connected to the RTC 15 is a battery circuit 15a for supplying a backup voltage when the power of the main unit 1a is turned off. With this battery circuit 15a, the RTC 15 can continue timing even after the power of the main unit 1a is turned off.
[0055]
  The audio LSI 17 converts the analog audio signal received by the NCU 19 into a digital audio signal, converts the digital audio signal generated inside the parent device 1 a into an analog audio signal, and outputs the analog audio signal to the NCU 19.
[0056]
  The antenna 18 is used to transmit and receive data between the parent device 1a and the child devices 1b to 1d, and data and various signals transmitted to the child devices 1b to 1d are transmitted via the antenna 18. On the other hand, data and various signals transmitted from the slave units 1 b to 1 d to the master unit 1 a are received via the antenna 18. The received data is input to the CPU 11 via the cordless unit 51. Data transmitted from the parent device 1 a to the child devices 1 b to 1 d is output to the child devices 1 b to 1 d via the antenna 18 via the cordless unit 51.
[0057]
  The cordless unit 51 is a unit for transmitting and receiving audio signals and data signals as radio waves. The modem 20 performs modulation and demodulation of image data and e-mail data, and transmits and receives various procedure signals for transmission control. The buffer 21 temporarily stores encoded facsimile data transmitted / received to / from other facsimile apparatuses and image data of a document read by the scanner 22.
[0058]
  The scanner 22 is for reading an image of a document inserted into the document insertion slot 6, and the encoding unit 23 is for encoding the document image read by the scanner 22. The decrypting unit 24 reads the received facsimile data stored in the buffer 21 and decrypts the received facsimile data. The decrypted data is temporarily stored in the RAM 13 and then stored on the recording paper by the printer 25. Printed sequentially. The operation panel 4 is for the user to perform various operations such as setting of the master unit 1a as described above. The amplifier 27 sounds a speaker 28 connected to the amplifier 27 and outputs a ringing tone, a voice message, and the like.
[0059]
  Next, the electrical configuration of the slave units 1b to 1d will be described using the slave unit 1b. In addition, since the subunit | mobile_unit 1c, 1d is comprised similarly to the subunit | mobile_unit 1b, the description is abbreviate | omitted. The subunit | mobile_unit 1b is provided with CPU30, ROM31, RAM32, the cordless unit 34, the operation panel 37, and LCD38, These are mutually connected.
[0060]
  The CPU 30 controls each unit in accordance with a signal input by the user or various signals transmitted from the base unit 1a via the cordless unit 34, and executes a telephone operation or the like (including data communication with the base unit 1a). To do. The ROM 31 is a non-rewritable memory that stores a control program executed by the slave unit 1b. The RAM 32 is a memory for temporarily storing various data. The RAM 32 is a memory for temporarily storing various data.
[0061]
  The antenna 33 transmits and receives radio waves between the slave unit 1b and the master unit 1a, and is connected to the cordless unit 34, the microphone 35, and the speaker 36. The analog audio signal transmitted from the main unit 1a is received by the antenna 33 and then output to the speaker 36. The analog audio signal (user's utterance) input from the microphone 35 is transmitted from the antenna 33 to the main unit 1a. Is sent.
[0062]
  The cordless unit 34 is a unit for transmitting and receiving audio signals and data signals as radio waves. The cordless unit 34 is for transmitting and receiving data to and from the base unit 1a. Various signals transmitted from the handset 1b to the base unit 1a are transmitted from the cordless unit 34 via the antenna 33. On the other hand, various signals transmitted from the parent device 1 a to the child device 1 b are received by the antenna 33 and then input to the CPU 30 via the cordless unit 34.
[0063]
  This subunit | mobile_unit 1b is comprised so that it may connect with the charging stand 50 via the connector 49. FIG. And the subunit | mobile_unit 1b receives the power supply from an external power supply by connecting with the charging stand 50 with the connector 49. FIG. The supplied power is supplied via the connector 49 to the power supply unit 48 built in the slave unit 1b. The power supply unit 48 is provided with a secondary battery, and the secondary battery is charged by the supplied power. Since the handset 1b is supplied with power from the power supply unit 48, power is guaranteed (by the secondary battery provided in the power supply unit 48) even when it is picked up from the charging stand 50 and operated.
[0064]
  The CPU 30 monitors the connection state between the connector 49 and the charging stand 50, and when the CPU 30 recognizes that the connector 49 is disconnected from the charging stand 50, the control channel detection process is executed in an intermittent operation. .
[0065]
  Next, with reference to the flowcharts of FIGS. 11 to 13, wireless communication executed by the base unit 1a of the cordless parent / child phone device 1 configured as described above will be described. FIG. 11 is a flowchart showing the wireless communication process executed by the base unit 1a. In this wireless communication processing, among the communication channels stored in the first total score table 14c of the EEPROM 14, a communication channel satisfying a predetermined standard (8 points or less in this embodiment), and the communication channel has The first total score is associated and called to the extraction table 13a of the RAM 13 (S1). That is, from the first total score table 14c, the first, second, fourth, and sixth channels whose first total score is 8 points or less, and the first total score corresponding to each call channel, 2, 6, 7, and 8 points, To the extraction table 13a in association with each other.
[0066]
  Next, empty channel scan processing is executed for the call channels (channels 1, 2, 4, and 6) that have been called to the extraction table 13a (S2). This empty channel scan process (S2) is a process for detecting the RSSI of each call channel (1, 2, 4, 6 channels) called to the extraction table 13a. This empty channel scan process (S2) will be described with reference to the flowchart of FIG.
[0067]
  In the empty channel scan process (S2), one call channel for detecting RSSI is set from the call channels (channels 1, 2, 4, and 6) called in the extraction table 13a of the RAM 13 (S10). The RSSI of the set call channel is detected, and the detected RSSI is associated with the call channel and written to the RSSI table 13b of the RAM 13 (S11). Then, it is determined whether or not the processing of S10 and S11 is completed for each call channel (1, 2, 4, 6 channels) for which the processing of S10 and S11 is called to the extraction table 13a (S12). When the processing of S10 and S11 is completed for each call channel (1, 2, 4, 6 channel) (S12: Yes), the RSSI is associated with each call channel (1, 2, 4, 6 channel). Based on the RSSI written in the table 13b, the rank is assigned in order from the smallest RSSI (S13), and this empty channel scan processing is terminated. If the processing of S10 and S11 is not completed for each call channel (1, 2, 4, 6 channels) (S12: No), the processing of S10 and S11 is executed for each call channel.
[0068]
  Returning to FIG. 11, the description after the vacant channel scan process (S2) is completed. When the empty channel scan process (S2) is completed, the control channel scan process is executed (S3). The control channel scan process (S3) is a process for confirming whether or not the call information from the slave units 1b to 1d is received on the control channel. When calling information or the like is received from the slave units 1b to 1d, that is, when there is a call from the slave units 1b to 1d to the own station (master unit 1a) via the extension (S4: Yes), Alternatively, when a call operation to the slave units 1b to 1d is performed via an external line (S5: Yes), a call channel assignment process (S6) is executed.
[0069]
  The call channel assignment process (S6) will be described with reference to the flowchart of FIG. The call channel assignment process (S6) actually executes wireless communication with the slave units 1b to 1d from the call channels (1, 2, 4, 6 channels) stored in the RSSI table 13a of the RAM 13 described above. This is a process of assigning one call channel.
[0070]
  In this call channel assignment process (S6), the order of each call channel (1, 2, 4, 6 channel) stored in the RSSI table 13b and the corresponding call channel (shown in the extraction table 13a) The first total score of (1, 2, 4, 6 channels) is added (S15). The added total score is stored as a second total score in the second total score table 13c in association with each call channel (1, 2, 4, 6 channels) (S16). Then, based on the second total score stored in the second total score table 13c in association with each call channel (1, 2, 4, 6 channels), each call channel (1 , 2, 4 and 6 channels) is assigned (S17). The call channel (1 channel) assigned the first rank among the assigned ranks is assigned as a call channel for actually performing wireless communication with the slave units 1b to 1d (S18).
[0071]
  Returning again to FIG. 11, the description after the end of the call channel assignment process (S6) will be continued. After the call channel assignment process (S6) is completed, wireless communication is performed between the parent device 1a and the child devices 1b to 1d using the call channel assigned by the call channel assignment process (S6), and the normal call process ( S7) is performed. Further, when the call processing (S7) is completed, when there is no call from the slave units 1b to 1d to the own station (master unit 1a) via the extension (S4: No), from the master unit 1a via the external line When the call operation to the child devices 1b to 1d is not performed (S5: No), the processing from S1 to S3 is repeatedly executed. At this time, the RSSI is detected again for the call channel stored in the extraction table 13a, and the RSSI stored in the RSSI table 13b is updated to the newly detected RSSI (RSSI in FIG. 7). Refer to the RSSI table in FIG. 8 from the table).
[0072]
  In this embodiment, the processing of S10 and S11 in FIG. 12 corresponds to the communication parameter detection means described in claims 1 and 5. The detected data storage means of claim 1 corresponds to the processing of S11 in FIG. The communication channel assignment means according to claims 1 and 5 corresponds to the process of S6 in FIG. The process of S1 in FIG. 11 corresponds to the call channel extracting means according to claim 3 and the second call channel extracting means according to claim 4. The first point giving means according to claim 7 corresponds to the processing of S13 in FIG.
[0073]
  Next, a second embodiment of the present invention will be described with reference to FIG. The second total score table 13c shown in FIG. 9 of the above embodiment is the total score of the first total score of each call channel stored in the extraction table 13a and the rank assigned to each call channel in the RSSI table 13b. Are stored in correspondence with each call channel as the second total score of each call channel. That is, the second total score is a total score of the ranks assigned to each call channel based on the detected data by detecting BER, SNR, and RSSI as communication parameters for each call channel.
[0074]
  However, the above three types of communication parameters (BER, SNR, and RSSI) adopted for indicating the communication quality of each call channel have different degrees of indexability of communication quality. That is, the channel assigned the first rank based on the BER and the channel assigned the first rank based on the RSSI are the channels assigned the first rank based on the RSSI. It is known that the communication quality is better. Therefore, in the second embodiment of the present invention, when calculating the second total score of the second total score table 13c, different weights are given to the ranks detected based on the communication parameters. .
[0075]
  For example, when calculating the 2nd total score of 1 channel in the 2nd total score table shown in FIG. 10, 4 points by the 4th place assigned in the RSSI table 13b after the update shown in FIG. 8 is doubled. The calculated 8 points are calculated as 10 points added with the first total score of 2 points given in the extraction table 13a shown in FIG. Thereafter, the second total score is similarly calculated for each call channel, and based on the calculated second total score, the first rank is given to the two channels having the lowest second total score of 8 points. The second highest ranking is given to 4 channels, which have the second second total score of 11 points next to 2 channels. Thus, in the second total score table 13c, the call channel assigned the first rank is assigned as the call channel for executing the actual call.
[0076]
  As described above, in the second total score table shown in FIG. 9, even if there are two channels assigned the second rank, these two channels are ranked first in the RSSI table shown in FIG. Therefore, as a result of considering the influence of the communication quality based on the RSSI, in the second total score table shown in FIG. 10, the first rank is assigned, and the call channel for actually executing the wireless communication Will be assigned as Therefore, according to the second embodiment of the present invention, the RSSI detection result that greatly affects the communication quality can be reflected with great influence when allocating to one speech channel that actually performs wireless communication.
[0077]
  Although the present invention has been described based on the embodiments, the present invention is not limited to the above-described embodiments, and various modifications can be easily made without departing from the spirit of the present invention. It can be done.
[0078]
  For example, in the present embodiment, a case has been described in which BER, SNR, and RSSI are detected for each communication channel as communication parameters for indicating the communication quality of each communication channel. However, the communication parameter for indicating the communication quality of each communication channel is not limited to the above, and may be SIR (Signal to Interference Ratio) indicating the ratio between the target signal and the interference signal.
[0079]
  Further, the number of communication parameters detected for each call channel is not limited to three, and may be, for example, only one type of RSSI or two types of BER and RSSI. In such a case, since there are few communication parameters to be detected, it is possible to allocate one call channel for actually performing wireless communication efficiently. Four types of BER, SNR, RSSI, and SIR may be used. In such a case, a call channel with good communication quality can be assigned as one call channel for actually executing wireless communication with high reliability.
[0080]
  In addition, for each communication channel, the operation status of the master unit and the slave unit when detecting communication parameters does not have to be in standby, but communication parameters can be detected when an external line is received that changes the radio wave conditions. May be performed.
[0081]
  In the present embodiment, the processing from S15 to S18 in FIG. 13 has been described as the call channel assignment processing. However, the processing from S15 to S18 in FIG. 13 may be executed after the processing in S11 as part of the empty channel scan processing in FIG.
[0082]
【The invention's effect】
[0083]
[0084]
[0085]
[0086]
  Claim1According to the described wireless communication device,A call channel assigned to one call channel that actually executes a call is assigned from at least one or more call channels extracted in advance from among a plurality of call channels. Therefore, it is possible to assign one call channel for actually executing a call from a smaller number of call channels than a plurality of call channels, and to effectively assign one call channel. In addition, a communication parameter that is different from the communication parameter that serves as an index when extracted by the communication parameter extracting unit and varies depending on the detection and affects the communication quality rather than the communication parameter is extracted by the call channel extracting unit. Each extracted call channel is detected by the communication parameter detecting means, and the call channel assigning means is Based on the detection data detected by the communication parameter detecting means, one call channel for actually executing a call is allocated, so that there is an effect that the communication quality of each call channel can be grasped with higher reliability. .
  Further, the call channel allocating means is based on the total points calculated by increasing the weight of the first point between the first point and the second point assigned by the first point giving means and the second point giving means. From the extracted call channels extracted by the call channel extraction means, one call channel for actually executing the call is assigned. Therefore, there is an effect that data of each call channel detected based on different types of communication parameters can be processed efficiently.
  Further, according to the type of communication parameter, there is an effect that each communication parameter can give a light weight to the influence when allocating one call channel for actually executing wireless communication. Therefore, for communication parameters that greatly affect the communication quality of each call channel, a call point that is optimal for wireless communication can be assigned as a call channel that actually performs wireless communication, for example, by giving a large point.
[0087]
[0088]
  Claim2According to the described wireless communication device, the claim1In addition to the effects of the described wireless communication device,New detection data detected by the communication parameter detection means is It is updated by the detection data updating means. Therefore, even when the communication quality of each extracted call channel changes with time, one call channel that is optimal for wireless communication can be allocated from among a plurality of call channels in response to the change. effective.
[0089]
[0090]
[0091]
[Brief description of the drawings]
FIG. 1 is an external perspective view of a cordless parent / child phone device according to an embodiment of the present invention.
FIG. 2 is a block diagram showing an electrical configuration of the cordless parent / child telephone device.
FIG. 3 is a diagram showing a BER table.
FIG. 4 is a diagram showing an SNR table.
FIG. 5 is a diagram showing a first total score table.
FIG. 6 is a diagram showing an extraction table.
FIG. 7 is a diagram showing an RSSI table.
FIG. 8 is a diagram showing an updated RSSI table.
FIG. 9 is a diagram showing a second total score table.
FIG. 10 is a diagram showing a second total score table of the second embodiment.
FIG. 11 is a flowchart of a wireless communication process.
FIG. 12 is a flowchart of an empty channel scan process.
FIG. 13 is a flowchart of a call channel assignment process.
[Explanation of symbols]
1 Cordless parent and child telephone device (wireless communication device)
1a Master unit (partner device)
1b to 1d Slave unit (partner device)

Claims (2)

In a wireless communication device that assigns one call channel that actually performs a call from a plurality of call channels and performs wireless communication with the counterpart device using the assigned call channel.
A communication parameter for indicating the communication quality of each call channel is detected in advance for each call channel, and the detected data is stored in association with each call channel as unique data of each call channel. Data storage means;
Call channel extraction means for extracting at least one call channel satisfying a predetermined standard based on the unique data of each call channel stored in the unique data storage means;
In order to index the communication quality of each extracted call channel extracted by the call channel extraction means, the communication parameter is a type different from the communication parameter, and varies depending on detection and affects the communication quality rather than the communication parameter. Communication parameter detecting means for detecting parameters;
In response to detection data of each extracted call channel detected by the communication parameter detection means, a first point giving means for giving a first point to each extracted call channel, and unique data stored in the unique data storage means in response, both and a second point assigning means for assigning second point in each extraction communication channel, a first point to a second point granted by said first point awarding means and the second point awarding means A call to which one call channel for actually executing a call is allocated from among the extracted call channels extracted by the call channel extraction means based on the total points calculated with the first point weighting increased. A wireless communication apparatus comprising: a channel assigning unit. Detection data storage means for storing the detection data detected by the communication parameter detection means in association with each extracted call channel;
The detection data update means for updating the detection data of each extracted call channel stored in the detection data storage means to new detection data detected by the communication parameter detection means. the wireless communication apparatus according to 1.

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