JP2005311931A - Radio communication apparatus and speech channel exchange method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication apparatus capable of preventing, as much as possible, other equipment from being interfered by an exchanged reserve channel if a defective channel where an interference radio wave from the other equipment is detected, is exchanged for the reserve channel. <P>SOLUTION: In cordless telephone equipment of a frequency hopping spectrum spreading scheme comprised of a handset and a base unit including main control sections 100, 200 for controlling the entire units, respectively, the main control section 100 of the handset or the main control section 200 of the base unit holds partial channels to be used for a call as channels for use among a plurality of channels, holds the remaining channels of the plurality of channels as reserve channels and divides all the channels into a plurality of channel groups according to levels of frequencies. If a defective channel occurs, the defective channel is exchanged for any reserve channel in a channel group to which the incurred defective channel does not belong, in the plurality of channel groups. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a frequency hopping spread spectrum (FHSS: Frequency Hopping Spread Spectrum) type wireless communication apparatus and a communication channel switching method.

  In recent years, in the wireless communication field, various standards have been standardized, and devices having various uses have been used using the same frequency band.

  For example, the frequency band from 2.402 GHz to 2.480 MHz, called the 2.4 GHz band ISM (Industry Science Medical) band, was established by IEEE (Institute of Electrical and Electrical Engineers, 80, established by the Institute of Electrical and Electronics Engineers of Japan, 1). And 802.11b (wireless LAN), Bluetooth, and cordless telephones. Furthermore, this frequency band is also a band overlapping with the frequency of electromagnetic waves generated by a magnetron used in a microwave oven or the like.

  Therefore, conventionally, interference has been avoided by detecting jamming waves from other devices and switching the operating frequency. For example, Patent Literature 1 describes a wireless communication device that can perform good communication by detecting interference from other devices and switching frequencies.

According to the frequency hopping wireless communication apparatus of Patent Document 1, the reception electric field strength of a selected channel is measured as a slave unit, and if the value exceeds the threshold of bad channel determination, it is regarded as a bad channel and the information is regarded as a parent channel. The faulty channel is exchanged for the spare channel based on the exchange request from the parent machine.
JP 2001-339760 A

  In the frequency hopping wireless communication device described in (Patent Document 1), when a defective channel and a spare channel are switched (replaced), the priority order for using the spare channel is not particularly specified. There is a problem in that there is a possibility that a channel close in frequency may be selected when the channel is replaced. When the own device and another device are communicating at frequencies close to each other, the own device detects interference from the other device and replaces the defective channel with the spare channel. If you are communicating in a strong situation and the other equipment is communicating in a situation where the communication radio wave is weak, select a channel that is close to the frequency of the defective channel as a backup channel that does not receive interference from the other equipment. If selected, even though the device itself intends to avoid interference, it has a problem that other devices may be disturbed.

  In this wireless communication apparatus, when a defective channel that has detected an interference radio wave from another device is replaced with a spare channel, the defective channel can be replaced with a good spare channel, and the replaced spare channel is transferred to the other device. It is required not to interfere with it.

In order to satisfy this requirement, the present invention can replace a defective channel with a good spare channel when the defective channel in which interference radio waves from other devices are detected and the spare channel are exchanged. An object of the present invention is to provide a wireless communication apparatus that can prevent interference with other devices as much as possible.

  The wireless communication device of the present invention is a frequency hopping spread spectrum wireless communication device comprising a slave unit and a master unit each having a main control unit for controlling the whole, and is a main control unit of the slave unit or a main control of the master unit The part retains some channels used for calls from among multiple channels as used channels, retains the remaining channels of the multiple channels as spare channels, and sets all channels to multiple channel groups according to the frequency level. In the case where a defective channel occurs, a spare channel and a defective channel of a channel group to which the generated defective channel does not belong are exchanged among the plurality of channel groups.

  As a result, when a defective channel that has detected interference radio waves from another device is replaced with a spare channel, the defective channel can be replaced with a good spare channel, and other devices can be prevented from being disturbed by the replaced spare channel. A wireless communication apparatus that can prevent as much as possible is obtained.

  The wireless communication device of the present invention is a frequency hopping spread spectrum wireless communication device comprising a slave unit and a master unit each having a main control unit for controlling the whole, and is a main control unit of the slave unit or a main control of the master unit The part retains some channels used for calls from among multiple channels as used channels, retains the remaining channels of the multiple channels as spare channels, and sets all channels to multiple channel groups according to the frequency level. If a defective channel occurs, the defective channel does not belong by exchanging the spare channel and the defective channel of the channel group that does not belong to the defective channel among the plurality of channel groups. The spare channel of the channel group with less interference to other devices, that is, the channel with less frequency interference Since it is possible to select a spare channel of a channel group, it is possible to replace a defective channel with a good spare channel, and to prevent other devices from being disturbed by the exchanged spare channel as much as possible. Is obtained.

  Further, the main control unit of the slave unit or the main control unit of the master unit selects a channel group having a spare channel from a plurality of channel groups according to a predetermined priority order, thereby preventing interference with other devices. Priorities can be set to select spare channels with fewer channels, that is, channels with less frequency interference, so the bad channel can be replaced with a good spare channel and replaced An advantageous effect is obtained that interference to other devices by the spare channel can be prevented as much as possible.

  Furthermore, the main control unit of the slave unit or the main control unit of the master unit can influence other devices that are interfering by setting a higher priority as the frequency is further away from the channel group of the defective channel. The advantageous effect that it can be suppressed as much as possible is obtained.

Furthermore, the master unit includes a master unit storage unit that holds a plurality of spare channels, a jamming radio wave detection unit that detects interference radio waves in all channels, a data error detection unit that detects data errors in call data, and an interference Channel information storage means for storing a channel number in which a radio wave or data error is detected and a count value of an error counter that is counted up when an interference radio wave or data error is detected, and a channel number channel based on the error counter value Priority is given to a defective channel determination unit that determines whether or not a channel is a defective channel, and a spare channel group in a channel group that is as far away as possible from the channel group to which the channel that is determined to be a defective channel by the defective channel determination unit belongs. Channel selection means to select according to order and present in selected spare channel group By using a channel switching means for exchanging a good spare channel and a channel determined to be a bad channel, it is possible to use a spare channel as far as possible from a frequency channel used by another interfering device. Therefore, there is an advantageous effect that a hopping pattern that can suppress the influence on other interfering devices as much as possible is used.

  Further, the slave unit includes a slave unit storage unit that holds a plurality of spare channels, a jamming radio wave detection unit that detects interference radio waves in all channels, a data error detection unit that detects data errors in call data, and an interference Channel information storage means for storing a channel number in which a radio wave or data error is detected and a count value of an error counter that is counted up when an interference radio wave or data error is detected, and a channel number channel based on the error counter value A bad channel determination means for determining whether or not to be a bad channel, and a good spare existing in a channel group as far as possible from the channel group to which the channel determined to be a bad channel by the bad channel determination means belongs. A channel exchange means for exchanging a channel and a channel determined to be a bad channel; By having a spare channel as far as possible from the frequency channel used by the interfering other device, the hopping can suppress the influence on the interfering other device as much as possible. The advantageous effect of using a pattern is obtained.

  Furthermore, the jamming wave detection means periodically measures the received electric field strength of all channels using slots other than the slot used for voice data communication, and the measured received electric field strength value is equal to or greater than a threshold value regarded as jamming. If the interference radio wave is detected, and if the measured received electric field strength value is less than the threshold value, the interference radio wave is not detected. Since the channel is periodically measured, it is possible to always ensure fresh channel information and to obtain an advantageous effect that highly reliable communication can be performed.

  Furthermore, the data error detection means can inspect all the call data by detecting whether or not the data used for the call is incorrect. If an error is detected, the count value of the error counter is set. If the error counter count value is equal to or greater than the threshold value for determining a bad channel, the bad channel and the backup channel can be switched, so communication can always be performed on a good channel and communication with good quality is possible. An advantageous effect is obtained.

  Further, the channel information storage means stores the number of times detected by the interference radio wave detection means and the data error detection means in a certain channel within a certain time as the count value of the error counter, so that the interference information is constantly updated. Therefore, an advantageous effect that highly reliable communication can be performed is obtained.

  Further, the bad channel determination means determines that the use channel or the backup channel is determined to be a bad channel when the count value of the error counter stored in the channel information storage means is equal to or greater than a threshold value for determining the bad channel in the use channel or the backup channel. By determining, it is possible to determine not only the used channel but also the spare channel as a defective channel. Therefore, when the defective channel and the spare channel are replaced, an extra operation such as replacing with a spare channel is performed for the time being. Therefore, it is possible to perform channel exchange with high efficiency and to obtain an advantageous effect that communication with high reliability is possible.

Further, the channel exchange means exchanges the channel determined as the defective channel by the defective channel determination means and the spare channel selected by the channel selection means, and the slave unit performs the exchange based on the exchange request from the master unit. As a result, both the parent device and the child device can always communicate with each other with a good channel, and an advantageous effect that communication with good quality is possible is obtained.

  The present invention replaces a defective channel and a spare channel for the purpose of preventing interference with other devices due to the exchanged spare channel when the defective channel and the spare channel that have detected interference radio waves from another device are exchanged. In addition, this is realized by increasing the priority of the backup channel group that minimizes interference as much as possible in frequency and preferentially selecting the higher priority.

  A first invention made to solve the above problems is a frequency hopping spread spectrum radio communication apparatus comprising a slave unit and a master unit each having a main control unit for controlling the whole, and the main control of the slave unit Or the main control unit of the master unit divides a plurality of channels permitted to be used into a plurality of channel groups according to the level of frequency, and uses a part of the channels used for a call from the plurality of channels as channels used And a channel other than the used channel is retained as a spare channel, and when a defective channel occurs, a spare channel of the channel group to which the defective channel does not belong and the defective channel out of the plurality of channel groups Of the channel group that does not belong to the faulty channel that occurred. It is possible to select a spare channel of a non-channel group, that is, a spare channel of a channel group with less frequency interference, so that a bad channel can be replaced with a good spare channel and the exchanged spare channel can be used for other equipment. It has the action and effect of preventing interference as much as possible.

  The second invention made to solve the above problem is that the main control unit of the slave unit or the main control unit of the master unit determines a channel group having a spare channel from a plurality of channel groups in advance. Since it is decided to select according to the priority order, the priority order can be determined so as to select the spare channel of the channel group with less interference to other devices, i.e., the spare channel of the channel group with less frequency interference. The defective channel can be exchanged for a good spare channel, and interference with other devices by the exchanged spare channel can be prevented as much as possible.

  The third invention made to solve the above-mentioned problem is that the main control unit of the slave unit or the main control unit of the master unit sets a higher priority as the frequency is further away from the channel group of the defective channel. It has the action and effect of being able to suppress the influence on other interfering devices as much as possible.

According to a fourth aspect of the present invention for solving the above-mentioned problems, the master unit includes a master unit storage unit for holding a plurality of spare channels, jamming radio wave detection means for detecting interference radio waves in all channels, call data Channel information storage for storing data error detection means for detecting a data error and a channel number in which an interference radio wave or data error is detected and a count value of an error counter that is counted up when an interference radio wave or data error is detected Means, a defective channel determination means for determining whether or not a channel with a channel number is determined as a defective channel based on an error counter value, and a channel group to which a channel determined as a defective channel by the defective channel determination means belongs in terms of frequency Channel selection that selects spare channels in distant channels as much as possible according to priority And a channel exchange means for exchanging a good spare channel existing in the selected spare channel group and a channel determined to be a bad channel, and using other interfering devices. Since a spare channel that is as far as possible from a certain frequency channel is used, the hopping pattern that can suppress the influence on other interfering devices as much as possible is used. .

  According to a fifth aspect of the present invention for solving the above-mentioned problems, the slave unit includes a slave unit storage unit for holding a plurality of spare channels, jamming radio wave detection means for detecting interference radio waves in all channels, and call data. Channel information storage for storing data error detection means for detecting a data error and a channel number in which an interference radio wave or data error is detected and a count value of an error counter that is counted up when an interference radio wave or data error is detected Means, a defective channel determination means for determining whether or not a channel with a channel number is determined as a defective channel based on an error counter value, and a channel group to which a channel determined as a defective channel by the defective channel determination means belongs in terms of frequency Determined as good and bad channels in distant channels as possible And a channel switching means for exchanging with the channel, and since a spare channel as far as possible from the frequency channel used by another interfering device is used, interference occurs. This has the effect of using a hopping pattern that can suppress the influence on other devices as much as possible.

  The sixth invention made to solve the above-mentioned problem is that the jamming wave detecting means periodically measures the received electric field strength of all the channels using a slot other than the slot used for voice data communication, If the measured received field strength value is greater than or equal to the threshold value considered as interference, it is assumed that an interfering radio wave is detected, and if the measured received field strength value is less than the threshold value, no interfering radio wave is detected. Yes, since all the channels are measured regularly by effectively utilizing slots that are not used for communication, fresh channel information can always be ensured and reliable communication can be performed. Has the effect of being able to.

  The seventh invention made to solve the above-mentioned problem is that the data error detecting means detects whether or not the data used for the call is incorrect, and inspects all the call data. If an error is detected, the error counter count value is increased. If the error counter count value is equal to or higher than the threshold value for determining a bad channel, the bad channel and the spare channel can be switched. Communication can be performed on a good channel, and the operation and effect that high-quality communication is possible are provided.

  According to an eighth aspect of the invention for solving the above-mentioned problem, the channel information storage means calculates the number of times detected by the jamming wave detection means and the data error detection means in a certain channel within a certain time as a count value of the error counter. Since the disturbance information is constantly updated, it has an operation and effect that highly reliable communication can be performed.

  According to a ninth aspect of the invention for solving the above-mentioned problem, the bad channel determination means has a count value of the error counter stored by the channel information storage means equal to or greater than a threshold value for determining a bad channel in the use channel or the backup channel. In this case, the used channel or the spare channel is determined as a defective channel, and not only the used channel but also the spare channel can be determined as a defective channel. However, there is an operation and effect that highly efficient channel exchange can be performed without performing an extra operation such as switching to a spare channel for some time, and highly reliable communication is possible.

  According to a tenth aspect of the invention for solving the above-mentioned problem, the channel switching means exchanges the channel determined to be a bad channel by the bad channel determination means and the spare channel selected by the channel selection means, Is to perform the exchange based on the exchange request from the master unit, and both the master unit and the slave unit can always communicate with each other with a good channel, and high quality communication is possible. Has action and effect.

(Embodiment 1)
A configuration of a cordless telephone apparatus as an example of a frequency hopping spread spectrum wireless communication apparatus will be described with reference to FIGS.

  FIG. 1 is a block diagram showing a slave unit constituting the cordless telephone device, and FIG. 2 is a block diagram showing a master unit constituting the cordless phone device.

  In FIG. 1, 100 is a main control unit as a slave control unit for controlling the whole, 101 is an antenna, 102 is a radio circuit for transmitting and receiving radio signals, 103 is a speaker and microphone used during a call, and 104 is on a public line Call circuit for making a call with the other party's telephone, 105 is a ringer circuit that generates a ringer sound, 106 is a speaker that emits a ringer sound, 107 is an LCD display circuit that displays data, 108 is an instruction by pressing a button or the like An input device, 109 is a RAM serving as a slave unit storage unit, and 110 is a ROM that stores programs and the like.

  In FIG. 2, 200 is a main control unit as a base unit control unit for controlling the whole, 201 is an antenna, 202 is a radio circuit for transmitting and receiving radio signals, 203 is a speaker and microphone used during a call, and 204 is on a public line. , A ringer circuit that generates a ringer sound, 206 a speaker that emits a ringer sound, 207 an LCD display circuit that displays data, 208 an instruction by pressing a button, etc. An input device to be performed, 209 is a RAM as a master unit storage unit, 210 is a ROM for storing a program, and 211 is a line interface unit (line I / F unit) for taking operation timing with the public line.

  FIG. 3 is a channel arrangement diagram showing the channel arrangement of the frequency hopping spread spectrum system.

  Here, frequency allocation will be described. In order to avoid radio wave interference with other wireless devices and the like (A-B), B used channels are held as a part of channels used for a call from among a plurality of A channels having different frequencies. In this system, A spare channels are held, A channels are assigned to C channel groups based on channel frequency values, and used channels and spare channels are assigned to the respective channel groups. = Considering a system having 90 channels, if the number of channels actually used is B = 45, the number of spare channels is 45. Further, the 90 channels are divided into three (C = 3), the channel group having a low frequency of channel numbers 1 to 30, the frequency of channel numbers 31 to 60 being the central channel group, and the frequency of channel numbers 61 to 90 being high. As shown in FIG. 3, the channel group is a channel group 1 (300), a channel group 2 (310), and a channel group 3 (320). Further, each channel group is arranged to have a use channel group and a spare channel group. An odd channel of the channel group 1 (300) is a use channel group 1 (301), and an even channel is a spare channel group 1 (302). Similarly, the odd channel of channel group 2 (310) is used channel group 2 (311), and the even channel is reserved channel group 2 (312). Further, the odd channel of the channel group 3 (320) is referred to as a use channel group 3 (321), and the even channel is referred to as a backup channel group 3 (322).

Next, a description will be given of the priority order of which spare channel group to replace the spare channel when the used channel is determined to be a defective channel by the defective channel determination means 14 and 34 (see FIGS. 5 and 6) described later. When it is determined that the used channel of the channel group 1 is a bad channel, first, the channel state is good in the spare channel group 3 (322) of the channel group 3 (320) farthest in frequency from the channel group 1 (300). Check if the channel exists. If a good channel exists, a spare channel of spare channel group 3 (322) is selected and replaced with a defective channel. If all the spare channels of the spare channel group 3 (322) are bad channels and there is no good channel, the spare channel group 2 (312) of the channel group 2 (310) farthest after the channel group 3 (320) Confirm that there is a channel with good channel condition. If a good channel exists, a spare channel of spare channel group 2 (312) is selected and replaced with a defective channel. If there is no good channel in channel group 2 (310), a spare channel is selected from spare channel group 1 (302) of channel group 1 (300) and replaced with a defective channel.

  As described above, when a defective channel is generated in the channel group 1 (300), the priority of the spare channel group to be selected when the spare channel is replaced is the highest priority channel of the spare channel group 3 (322). The reserved channel group 2 (312) and the reserved channel group 1 (302). In other words, a selection is made from a spare channel group as far as possible in terms of frequency. Similarly, when a defective channel is generated in the channel group 2 (310), the priority order of the protection channel group is the protection channel group 1 (302), the protection channel group 3 (322), and the protection channel group 2 (312). In this case, considering the 2.45 GHz (frequency slightly higher than the center of the 2.4 GHz band), which is the center frequency of the microwave oven using the frequency in the 2.4 GHz band, the spare channel group 1 is more than the spare channel group 3. Has a higher priority (priority order). Further, when a defective channel occurs in the channel group 3 (320), the priority order of the protection channel group is the protection channel group 1 (302), the protection channel group 2 (312), and the protection channel group 3 (322). Table 1 shows an example of the priority order.

  FIG. 4 is a data diagram showing storage information of each channel.

  Each channel has a channel error counter value, a channel state such as whether the channel is a bad channel or a good channel, and information on which channel group shown in FIG. Here, the error counter value is counted up when it is detected by interference wave detection means 11, 31 (see FIG. 5 and FIG. 6) described later, and data error detection means 12, 32 (FIG. 5, FIG. 5) described later. 6)) is added to the value counted up when a data error is detected. For example, when the threshold value of an error counter for determining a defective channel is 12, the error counter count values of channel numbers “42” and “43” exceed the threshold value, so that the channel is a defective channel. Even if it is a spare channel, the state is maintained as a defective channel. In this case, the spare channel is an unusable spare channel.

  FIG. 5 is a functional block diagram showing channel selecting means as function realizing means in main control unit 100 of the slave unit, and FIG. 6 shows channel selecting means as function realizing means in main control unit 200 of the master unit. It is a functional block diagram.

  In FIG. 5, 1 is a channel selection means for selecting a channel to be used in a call, 2 is a call means for performing control in a call, and 11 is a threshold value whose value is regarded as an interference by measuring the received electric field strength of each channel. If there is an interference signal, the interference signal detection means detects that there is an interference signal, 12 indicates a data error detection means for detecting whether or not the data used for the call is incorrect, and 13 indicates the channel number and channel of each channel. An error counter, channel information storage means for storing in the RAM 109 the state of the channel such as whether the channel is good or bad and which channel group in FIG. 3 belongs to, 14 is a count of the error counter stored in the RAM 109 by the channel information storage means 13 Bad channel that determines whether or not the value exceeds the threshold value considered bad channel Constant means, 15 is a channel exchange means for exchanging channels based on the channel replacement request i.e., whether the information interchanged with any spare channel and how bad channel from the base unit.

  In FIG. 6, 3 is a channel selection means for selecting a channel to be used in a call, 4 is a call means for controlling the call, 31 is a threshold value that is regarded as a disturbance by measuring the received electric field strength of each channel. If it exceeds the value, the jamming wave detecting means for detecting that the jamming radio wave exists, 32 is a data error detecting means for detecting whether or not the data used for the call is incorrect, 33 is the channel number of each channel, 3 is a channel information storage means for storing in the RAM 209 the channel status such as whether the channel is good or bad and which channel group in FIG. 3 belongs to, and 34 is an error counter stored in the RAM 209 by the channel information storage means 33 Defective channel that determines whether the count value exceeds the threshold value considered as a defective channel 3 is a channel selection means for selecting which spare channel is to be used based on the priority determined based on the arrangement of the blocks in FIG. 3, and 36 is information on channel selection of the channel selection means 35, that is, Channel exchange means for exchanging channels based on information indicating which defective channel and which spare channel are to be exchanged.

  FIG. 7 is a frame configuration diagram showing a frame configuration for data exchange between the parent device and the child device.

  In FIG. 7, reference numeral 400 denotes a frame configuration of the master unit, and reference numeral 410 denotes a frame configuration of the slave unit. One frame has 4 slots on the transmission side and 4 slots on the reception side. Make a call using one of the slots. When slot 1 is used as a call slot, slots 2 to 4 are empty slots. In the frequency hopping spread spectrum system, communication is performed while changing the channel (frequency) used for each frame. Therefore, the channels used in frame N and frame N + 1 are different.

  FIG. 8 is a flowchart showing a jamming detection procedure (operation of jamming radio wave detection means 11, 31) common to the parent device control unit 200 and the child device control unit 100. The operation of detecting the interference is performed in the standby state and during a call in the case of the master unit. In the standby state, there is no slot used for a call, and the reception field strength is measured using all reception slots. Channels for measurement are switched in order from 1 to 90 in units of frames. For example, the field strength is measured in the order of channel 1 in frame N, channel 2 in frame N + 1, and channel 3 in frame N + 2. During a call, the field strength is measured in the same manner as in the standby state using a slot that is not used as a call. For example, when slot 1 is used as a speech slot, the received field strength is measured using the remaining slots 2 to 4. In the case of a slave unit, the received electric field strength is changed while periodically changing the channel from 1 to 90 in a periodic manner, such as once every 10 frames, using a slot on the transmitting side that is not used during a call. Measure. Since every frame, the power consumption increases and the continuous callable time is shortened. The reason why the slave unit does not use the reception slot is that there is a possibility that the master unit may collide with the timing when it is talking with another slave unit.

  In FIG. 8, first, it is determined whether or not there is an empty slot other than that used for a call in one frame shown in FIG. 7 (S500). In the case of the parent device, it is determined whether there is a slot that is not used for the call on the receiving side, or in the case of the child device, there is a slot that is not used for the call on the transmitting side. Next, a channel for detecting whether there is a jamming wave is selected (S510). Here, the channel number next to the channel number used for the previous detection is selected. If the previous time is channel 1, this time is channel 2. The received electric field strength is measured in the slot selected in step S500 and in the channel selected in step S510 (S520). Next, it is determined whether or not the measured value exceeds a threshold value regarded as interference (S530). If exceeded, it is determined that interference has been detected, and the error counter for that channel is counted up (S540). If the count value of the error counter after counting up exceeds the threshold value for determining as a defective channel, it is determined that the channel is a defective channel (S550), and defective channel processing is performed (S560). As the timing to measure the received electric field strength, the electric field strength is measured several times at regular intervals in one slot, and if the threshold value that is considered to be interference is exceeded even once, the slot is considered to have detected interference. Increase the count value of the error counter of that channel by one. For example, if the time during which the received electric field strength can be measured in one receiving slot is 780 microseconds and the interval for measuring the received electric field strength is 56 microseconds, the measurement is performed 14 times per slot. become. If the threshold value regarded as interference is exceeded even once in 14 times, the count value of the error counter of the channel is increased by one.

  FIG. 9 is a flowchart showing a data error detection procedure (operation of the data error detection means 12, 32) common to the parent device control unit 200 and the child device control unit 100.

  In FIG. 9, first, communication data is received every frame in a slot in which a call is made (S600). It is checked whether or not the communication data is correct (S610). If the data is incorrect, the error counter of that channel is counted up (S620). If the count value of the error counter after counting up exceeds the threshold value for determining a defective channel, it is determined that the channel is a defective channel (S630), and defective channel processing is performed (S640).

  Here, the count value of the error counter of each channel is the sum of the value counted up by the jamming wave detection means 11, 31 and the value counted up by the data error detection means 12, 32.

  FIG. 10 shows a case where the count value of the error counter exceeds the threshold value for determining a defective channel when the count value of the error counter is increased by the jamming wave detection means 31 of FIG. 8 or the data error detection means 32 of FIG. It is a flowchart which shows the defective channel process performed to.

FIG. 10 shows a procedure for processing a defective channel of the master unit. The master unit confirms the defective channel notified by itself or the slave unit. First, the channel group to which the defective channel belongs is confirmed based on the channel group information of the channel information shown in FIG. 4 (S700). Next, the priority order of the backup channel group is set based on FIG. As described with reference to FIG. 3, the priority order is to select a channel group as far as possible from the channel group to which the defective channel belongs. If the channel group of the defective channel is 1 (S710), the priority order (order) of the protection channel group for selecting the protection channel is set to the protection channel group 3, the protection channel group 2, and the protection channel group 1 (S720). . If the channel group of the defective channel is 2 (S711), the priority (order) of the protection channel group for selecting the protection channel is set to the protection channel group 1, the protection channel group 3, and the protection channel group 2 (S721). If the channel group of the defective channel is 3 (S712), the priority (order) of the protection channel group for selecting the protection channel is set to the protection channel group 1, the protection channel group 2, and the protection channel group 3 (S722). In FIG. 10, the channel group of the defective channels is assumed to be 3.

  Next, it is confirmed whether or not there is a good spare channel in the set spare channel group A having the highest priority (S730). If a good spare channel exists, a spare channel to be replaced with a defective channel is selected from the spare channel group A (S740). If all the spare channels are used, or if the spare channel is determined as a bad channel and there is no good spare channel, check whether there is a good spare channel in the spare channel group B having the next highest priority. Confirm (S731). If a good spare channel exists, a spare channel to be replaced with a defective channel is selected from the channel group B (S741). If there is no good spare channel, it is checked whether there is a good channel in the spare channel group C having the next highest priority (S732). If it exists, a spare channel to replace the defective channel is selected from the spare channel group C (S742). If there is no good spare channel, it is determined that there is no free spare channel (S734), and the defective channel is used as it is (S760). If the channel to be exchanged can be selected, the selected channel and the defective channel are exchanged (S750). Next, the selected channel is notified wirelessly to the slave unit (S751).

  FIG. 11 is a flowchart showing a defective channel recovery procedure common to the parent device control unit 200 and the child device control unit 100.

  In this system, the error counters of all channels are counted down at a constant cycle (S800). For example, when the error counter is counted down every 5 seconds, if the error counter of each channel is not added by the jamming wave detection means 11 or 31 or the data error detection means 12 or 32 within 5 seconds, the error counter is counted. The value will be reduced. In the case of the master unit, the interference radio wave detection is performed by switching the channels 1 to 90 for each frame, and if the period of one frame is 10 milliseconds, one channel performs the interference detection every 900 milliseconds. . Accordingly, the jamming detection operation is performed five times within 5 seconds (5000 milliseconds), and the count value of the error counter is counted down only when no jamming is detected five times. Next, the count value of the error counter of each channel is checked (S810). Next, it is checked whether or not the count value of the error counter is less than the bad channel threshold value (S820). If it is less than the threshold, it is checked whether the channel is currently a bad channel based on the channel storage information of FIG. 4 (S830). If stored as a bad channel, the channel is switched to a good channel (S840). Then, the state of the spare channel used instead of the defective channel is switched from being used to being usable as a spare.

  FIG. 12 is a flowchart showing the fault channel processing procedure of the slave unit. This is a failure performed when the count value of the error counter is increased by the jamming wave detection means 11 of FIG. 8 or the data error detection means 12 of FIG. 9 and the error count value exceeds the threshold value for determining a defective channel. It is a flowchart which shows a channel process.

  In FIG. 12, first, the bad channel information is notified to the parent device by radio (S900). Next, the information on the backup channel selected by the bad channel processing (S910) of the master unit is received through the radio (S920), and the selected channel and the bad channel are switched (S930).

As described above, according to the present embodiment, a cordless telephone apparatus of a frequency hopping spread spectrum system comprising a slave unit and a master unit each having a main control unit 100, 200 for controlling the whole, the main control of the slave unit Unit 100 or main control unit 200 of the master unit holds a part of channels used for a call from a plurality of channels as used channels, holds the remaining channels of the plurality of channels as spare channels, and sets all channels Is divided into a plurality of channel groups according to the frequency level, and if a defective channel occurs, replace the spare channel and the defective channel of the channel group to which the generated defective channel does not belong among the plurality of channel groups. Among the channel groups that do not belong to the failed channel, the channel group with less interference to other devices is predicted. Since it is possible to select a spare channel of a channel group, that is, a channel group with less interference in terms of frequency, it is possible to replace a defective channel with a good spare channel and to prevent other devices from being disturbed by the exchanged spare channel as much as possible. can do.

  Further, the main control unit 100 of the slave unit or the main control unit 200 of the master unit selects a channel group having a spare channel from a plurality of channel groups according to a predetermined priority order, thereby allowing other devices to be selected. The priority can be set to select the spare channel of the channel group with less interference, i.e., the channel group with less frequency interference, so that the bad channel can be replaced with a good spare channel, Interference with other equipment by the exchanged spare channel can be prevented as much as possible.

  Furthermore, the main control unit 100 of the slave unit or the main control unit 200 of the base unit sets the priority higher as the frequency is further away from the channel group of the defective channel, thereby affecting the other devices that are interfering. Can be suppressed as much as possible.

  Further, the base unit includes a base unit storage unit 209 that holds a plurality of spare channels, and includes a jamming radio wave detection unit 31 that detects interference radio waves in all channels, and a data error detection unit 32 that detects data errors in the call data. Channel information storage means 33 for storing a channel number where an interference radio wave or data error is detected and a count value of an error counter which is counted up when an interference radio wave or data error is detected, and based on the error counter value In a channel group that is as far as possible in frequency from a channel group to which a channel that is determined to be a bad channel by the bad channel determination unit 34 belongs to a bad channel determination unit 34 that determines whether or not a channel with a channel number is a bad channel Channel selection means 35 for selecting a spare channel group according to priority, By using the channel switching means 36 for exchanging a good spare channel existing in the selected spare channel group and a channel determined to be a bad channel, it is possible to use a frequency channel used by another interfering device. Since a spare channel as far as possible is used, a hopping pattern that can suppress the influence on other interfering devices as much as possible is used.

  Further, the slave unit includes a slave unit storage unit 109 that holds a plurality of spare channels, and includes a jamming radio wave detection unit 11 that detects interference radio waves in all channels, and a data error detection unit 12 that detects data errors in call data. Channel information storage means 13 for storing a channel number in which an interference radio wave or data error is detected and a count value of an error counter that is counted up when an interference radio wave or data error is detected, and based on the error counter value In a channel group that is as far as possible in frequency from a channel group to which a channel that is determined to be a bad channel by the bad channel determination unit 14 belongs to a bad channel determination unit 14 that determines whether a channel with a channel number is a bad channel A good spare channel and a bad channel By using the channel switching means 15 for switching, the spare channel as far as possible from the frequency channel used by the interfering other device is used, so that the influence on the interfering other device is reduced. A hopping pattern that can be suppressed as much as possible will be used.

Further, the jamming radio wave detection means 11 and 31 periodically measure the received electric field strengths of all channels using slots other than the slots used for voice data communication, and the measured received electric field strength values are regarded as jamming. Effectively utilize slots that are not used in communication by assuming that an interfering radio wave has been detected if it is greater than or equal to the threshold value to be considered and that an interfering radio wave has not been detected if the measured received field strength value is less than the threshold value. Since all the channels are regularly measured, fresh channel information can always be ensured and highly reliable communication can be performed.

  Further, the data error detecting means 12 and 32 can inspect all the call data by detecting whether or not the data used for the call is incorrect. If an error is detected, the error counter If the count value is increased and the count value of the error counter is equal to or greater than the threshold value for determining a defective channel, the defective channel and the spare channel can be switched, so communication can always be performed on a good channel and the quality is good. Communication is possible.

  Furthermore, the channel information storage means 13, 33 stores the number of times detected by the jamming wave detection means 11, 31 and the data error detection means 12, 32 in a certain channel within a certain time as a count value of the error counter. Therefore, since the information on disturbance is constantly updated, highly reliable communication can be performed.

  Furthermore, the bad channel determination means 14 and 34, when the count value of the error counter stored in the channel information storage means 13 and 33 is equal to or higher than the threshold value for determining the bad channel in the use channel or the standby channel, By determining the spare channel as a defective channel, it is possible to determine not only the used channel but also the spare channel as a defective channel. Therefore, when the defective channel and the spare channel are replaced, the spare channel is replaced with a spare channel for the time being. Therefore, highly efficient channel exchange can be performed without performing excessive operations, and highly reliable communication is possible.

  Further, the channel exchange means 15 and 36 exchange the channel determined to be a bad channel by the bad channel determination means 14 and 34 and the spare channel selected by the channel selection means 35. In the slave unit, the exchange from the master unit is performed. By exchanging based on the request, it is possible to always perform communication on a good channel in both the parent device and the child device, and communication with good quality is possible.

  The present invention relates to a cordless telephone apparatus of frequency hopping spread spectrum system comprising a slave unit and a master unit, and when a defective channel in which interference radio waves from other devices are detected and a spare channel are exchanged, the other device using the exchanged spare channel Can be prevented as much as possible.

Block diagram showing a handset constituting the cordless telephone device Block diagram showing the base unit constituting the cordless telephone device Channel layout showing frequency hopping spread spectrum channel layout Data diagram showing storage information for each channel Functional block diagram showing channel selection means as function realization means in the main control unit of the slave unit Functional block diagram showing channel selection means as function realization means in the main control unit of the base unit Frame configuration diagram showing the frame configuration for data exchange between the master unit and the slave unit Flowchart showing a disturbance detection procedure common to the master unit control unit and the slave unit control unit Flow chart showing a data error detection procedure common to the master unit control unit and the slave unit control unit When the count value of the error counter is increased by the jamming wave detection means of FIG. 8 or the data error detection means of FIG. 9, the bad channel processing is performed when the count value of the error counter exceeds the threshold value for determining a bad channel. Flow chart shown Flow chart showing a procedure for returning a defective channel common to the master unit control unit and the slave unit control unit The flowchart which shows the defective channel processing procedure of the cordless handset

Explanation of symbols

1, 3 Channel selection means 2, 4 Call means 11, 31 Interference radio wave detection means 12, 32 Data error detection means 13, 33 Channel information storage means 14, 34 Defective channel determination means 15, 36 Channel switching means 35 Channel selection means 100 Main control unit (Slave unit control unit)
101, 201 Antenna 102, 202 Radio circuit 103, 203 Speaker and microphone 104, 204 Call circuit 105, 205 Ringer circuit 106, 206 Speaker 107, 207 LCD display circuit 108, 208 Input device 109, 209 RAM
110, 210 ROM
200 Main control unit (master unit control unit)
211 Line interface section (line I / F section)

Claims (13)

A frequency hopping spread spectrum wireless communication device comprising a slave unit and a master unit each having a main control unit for overall control,
The main control unit of the slave unit or the main control unit of the base unit divides a plurality of channels that are permitted to be used into a plurality of channel groups according to a frequency level, and uses the channel from among the plurality of channels for a call. Hold some channels as used channels, hold channels other than the used channels as spare channels,
When a defective channel is generated, the wireless communication apparatus is characterized in that a spare channel of the channel group to which the generated defective channel does not belong is exchanged with the defective channel among the plurality of channel groups. The main control unit of the slave unit or the main control unit of the master unit selects a channel group having the backup channel from the plurality of channel groups according to a predetermined priority order. Item 2. The wireless communication device according to Item 1. 3. The radio according to claim 2, wherein the main control unit of the slave unit or the main control unit of the base unit sets the priority higher as the distance from the channel group of the defective channel increases. Communication device. The base unit includes a base unit storage unit that holds a plurality of spare channels, a jamming radio wave detection unit that detects interference radio waves in all channels, a data error detection unit that detects data errors in call data, Channel information storage means for storing a channel number where an interference radio wave or the data error is detected and a count value of an error counter which is counted up when the interference radio wave or the data error is detected, and based on the error counter value And a channel group that is as far as possible in frequency from a channel group to which a channel that is determined to be a bad channel by the bad channel determination unit belongs. Channel selecting means for selecting a spare channel group in the medium according to the priority order; 4. The apparatus according to claim 1, further comprising a channel switching unit configured to replace a good backup channel existing in the selected backup channel group with a channel determined to be the bad channel. 5. Wireless communication device. The handset includes a handset storage unit that holds a plurality of spare channels, jamming radio wave detection means for detecting interference radio waves in all channels, data error detection means for detecting data errors in call data, Channel information storage means for storing a channel number where an interference radio wave or the data error is detected and a count value of an error counter which is counted up when the interference radio wave or the data error is detected, and based on the error counter value And a channel group that is as far as possible in frequency from a channel group to which a channel that is determined to be a bad channel by the bad channel determination unit belongs. A good spare channel present in the channel and the channel determined as the bad channel The wireless communication apparatus according to any one of claims 1 to 3, characterized in that it has a channel exchange means for exchanging and. The interference radio wave detecting means periodically measures the received electric field strength of all channels using a slot other than the slot used for voice data communication, and the measured value of the received electric field strength is equal to or greater than a threshold value regarded as an interference. 6. The wireless communication apparatus according to claim 4, wherein an interference radio wave is detected and an interference radio wave is not detected if the measured value of the received electric field intensity is less than the threshold value. . The wireless communication apparatus according to claim 4, wherein the data error detection unit detects whether or not data used for a call is incorrect. 5. The channel information storage means stores the number of times detected by the jamming wave detection means and the data error detection means in a certain channel within a certain time as a count value of the error counter. The wireless communication device according to any one of 1 to 7. The bad channel determination means, when the count value of the error counter stored by the channel information storage means in the use channel or the spare channel is equal to or greater than a threshold value for judging as a bad channel, The wireless communication device according to claim 4, wherein the wireless communication device is determined as a defective channel. The channel exchanging means exchanges a channel determined to be a bad channel by the bad channel determining means and a spare channel selected by the channel selecting means, and the slave unit is based on an exchange request from the master unit. The wireless communication apparatus according to claim 4, wherein the exchange is performed. A communication channel switching method in a frequency hopping spread spectrum system consisting of a slave unit and a master unit,
Keep some channels used for calls from multiple channels as used channels,
Holding the remaining channels of the plurality of channels as spare channels;
All channels are divided into multiple channel groups according to frequency,
A communication channel switching method for exchanging a defective channel with a spare channel of a channel group to which the generated defective channel does not belong among the plurality of channel groups when a defective channel occurs. 12. The call channel switching method according to claim 11, wherein the slave unit or the master unit selects a channel group having the spare channel from the plurality of channel groups according to a predetermined priority order. 13. The call channel switching method according to claim 12, wherein the child device or the parent device sets the priority higher as the distance from the channel group of the defective channel increases.

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