JP6180098B2 - Wireless terminal - Google Patents

Description

  The present invention relates to a mobile station radio in a digital radio communication system, and more particularly to an SCPC (Single Channel Per Carrier) type radio terminal.

  In digital radio terminals for land mobile communications, as a digital radio system that is currently in practical use, ARIB STD-T61 (Association of Radio Industries and Business Standards-T61: Non-Patent Document 1) formulated by the Radio Industries Association of Japan There are defined narrowband digital communication systems and the like.

  As a prior art document, JP2009-200252A (Patent Document 1) and the like can be cited.

JP 2009-200252 A

ARIB STD-T61

  When a wireless terminal wants to monitor a call made in the same area, it is necessary to prepare a wireless device corresponding to a plurality of channels or to perform monitoring while sequentially switching operations.

  Also, in a digital wireless communication system, even when a wireless terminal such as a mobile station is synchronized, a voice call may not be performed on that channel. Therefore, it is necessary to determine whether or not a voice call has been captured other than the synchronization capture.

  The wireless terminal of the present invention is a wireless terminal that selects a preset communication channel and performs a reception operation, has a scan mode for the wireless terminal to perform channel scanning, and is instructed to perform channel scanning. If the reception channel is changed according to the preset channel list and frame reception processing is performed, it is determined whether or not communication is being performed on the current channel by frame reception processing, and communication is performed based on the determination result Determines whether the channel on which communication is being performed is voice communication, and if the determination result is voice communication, the received voice is output, and if communication is not being performed by frame reception processing or If the communication being performed is not voice communication, change the reception channel again according to the channel list and perform channel scanning. Characterized in that the return Ri.

  The wireless terminal of the present invention is a wireless terminal that selects a preset communication channel and performs a reception operation, has a scan mode for the wireless terminal to perform channel scanning, and is instructed to perform channel scanning. If the reception channel is changed according to the preset channel list and frame reception processing is performed, it is determined whether or not communication is being performed on the current channel by frame reception processing, and communication is performed based on the determination result Determines whether the channel on which communication is being performed is voice communication, and if the determination result is voice communication, the received voice is output, and if communication is not being performed by frame reception processing or If the communication being performed is not voice communication, change the reception channel again according to the channel list and perform channel scanning. When the channel that has been scanned is voice communication and the channel that is outputting the received voice is terminated, the received channel is changed again according to the channel list and the channel scan is restarted. To do.

  The wireless terminal of the present invention is a wireless terminal that selects a preset communication channel and performs a reception operation, has a scan mode for the wireless terminal to perform channel scanning, and is instructed to perform channel scanning. If the reception channel is changed according to the preset channel list and frame reception processing is performed, it is determined whether or not communication is being performed on the current channel by frame reception processing, and communication is performed based on the determination result Determines whether the channel on which communication is being performed is voice communication, and if the determination result is voice communication, the received voice is output, and if communication is not being performed by frame reception processing or If the communication being performed is not voice communication, change the reception channel again according to the channel list and perform channel scanning. When the channel that was scanned is voice communication and the channel that is outputting the received voice has been communicated, the received channel is changed again according to the channel list and the channel scan is restarted. In the channel that is a voice communication and outputs the received voice, the channel scan is resumed by changing the reception channel again according to the channel list even when the communication of the channel is not completed.

  The wireless terminal of the present invention is a wireless terminal that selects a preset communication channel and performs a reception operation, has a scan mode for the wireless terminal to perform channel scanning, and is instructed to perform channel scanning. If the reception channel is changed according to the preset channel list and frame reception processing is performed, it is determined whether or not communication is being performed on the current channel by frame reception processing, and communication is performed based on the determination result Determines whether the channel on which communication is being performed is voice communication, and if the determination result is voice communication, the received voice is output, and if communication is not being performed by frame reception processing or If the communication being performed is not voice communication, change the reception channel again according to the channel list and perform channel scanning. When the channel that was scanned is voice communication and the channel that is outputting the received voice has been communicated, the received channel is changed again according to the channel list and the channel scan is restarted. When a scan mode stop instruction is given in a channel that is a voice communication and outputs received voice, the scan mode is stopped while maintaining the current channel.

  The wireless terminal of the present invention is a wireless terminal that selects a preset communication channel and performs a reception operation, has a scan mode for the wireless terminal to perform channel scanning, and is instructed to perform channel scanning. If the reception channel is changed according to the preset channel list and frame reception processing is performed, it is determined whether or not communication is being performed on the current channel by frame reception processing, and communication is performed based on the determination result Determines whether the channel on which communication is being performed is voice communication, and if the determination result is voice communication, the received voice is output, and if communication is not being performed by frame reception processing or If the communication being performed is not voice communication, change the reception channel again according to the channel list and perform channel scanning. Ri returns, scanned channel is characterized in that to continue waiting for communication channel when the communication channel is terminated in a channel which outputs a voice received a voice communication.

  The wireless terminal of the present invention is a wireless terminal that selects a preset communication channel and performs a reception operation, has a scan mode for the wireless terminal to perform channel scanning, and is instructed to perform channel scanning. If the reception channel is changed according to the preset channel list and frame reception processing is performed, it is determined whether or not communication is being performed on the current channel by frame reception processing, and communication is performed based on the determination result Determines whether the channel on which communication is being performed is voice communication, and if the determination result is voice communication, the received voice is output, and if communication is not being performed by frame reception processing or If the communication being performed is not voice communication, change the reception channel again according to the channel list and perform channel scanning. If the scanned channel is voice communication and the channel communication is completed in the channel outputting the received voice, the scan mode and the channel are restarted by changing the received channel again according to the channel list. When the communication is completed, two modes of the scan mode in which the standby for communication on the channel is continued can be selected.

  The above-described wireless terminal of the present invention has a plurality of wireless units capable of receiving different frequencies, and when a scan mode execution instruction is given, each of the wireless units changes a reception channel according to a preset channel list. A channel scan is performed.

  According to the present invention, it is possible to perform channel scanning regardless of the environment in which the mobile station is located (such as under the regular transmission base station, under the emergency transmission base station, or outside the service area).

  Further, according to the present invention, in a region where the wireless terminal is operated at a plurality of frequencies, a call is performed at a different frequency in the same region by restarting the scan when the call captured by the scan is completed. Even in this case, it becomes possible to monitor the call by scanning again. Furthermore, since a time-out period is provided for a frequency at which periodic communication is expected to be performed and scanning is resumed without waiting for the end of the call, the possibility of missing a call made at another frequency is reduced.

It is a figure which shows the structural example of a digital radio system. It is a block diagram for demonstrating the structure of the mobile station which is a radio | wireless terminal which concerns on one Example of this invention. It is a state transition diagram for demonstrating the channel scan of the radio | wireless terminal which concerns on one Example of this invention. 5 is a flowchart for explaining a channel scan operation of a wireless terminal according to an embodiment of the present invention; It is a display figure for demonstrating a display content on the display part of the radio | wireless terminal which concerns on one Example of this invention. It is a figure for demonstrating the physical radio channel structure of the radio | wireless terminal which concerns on one Example of this invention. It is a figure for demonstrating the channel signal format for communication of the radio | wireless terminal which concerns on one Example of this invention. It is a figure for demonstrating the RICH structure example of the radio | wireless terminal which concerns on one Example of this invention. It is a figure for demonstrating the signal format and PICH structural example of the synchronous burst of the radio | wireless terminal which concern on one Example of this invention. It is a state transition diagram for demonstrating the channel scan of the radio | wireless terminal which concerns on another one Example of this invention. It is a figure for demonstrating the identification information of the radio | wireless terminal which concerns on another one Example of this invention. 5 is a flowchart for explaining a channel scan operation of a wireless terminal according to an embodiment of the present invention.

An embodiment of the present invention will be described with reference to the drawings.
For example, an SCPC digital mobile communication system as shown in ARIB STD-T61 (see Non-Patent Document 1) is composed of a control station facility, a base station facility, a fixed station facility, and a mobile station facility with one entity as a basic unit. And communication is performed between the control station and the mobile station device (or fixed station device), or between the mobile station device (or fixed station device) and the mobile station device (or fixed station device). Thus, communication is performed via the base station apparatus or directly.

FIG. 1 shows a schematic configuration example of such a digital radio system.
The control station 101 is connected to a plurality of (in this example, a plurality of n) control tables (or extension telephones) 111-1 to 111-n, a control device 112 connected thereto, and a control device 112. Wireless device 113, a reception (Rx) antenna 114 and a transmission (Tx) antenna 115 of the wireless device 113 are provided.
Here, a base station apparatus is configured by the control apparatus 112, the radio apparatus 113, the reception antenna 114, and the transmission antenna 115, and a communication area (base zone) 116 of the base station apparatus is shown.
In addition, mobile station devices 121-1 to 121-5 that are a plurality of in-vehicle wireless terminals and mobile station devices 122-1 to 122-3 that are a plurality of portable wireless terminals are shown.

As the channel configuration, the frequency f1 is used in the downlink radio carrier of the base station apparatus, the frequency f2 is used in the uplink radio carrier of the base station apparatus, and the frequency f3 is used in the carrier for direct communication between the mobile station apparatuses. The Here, the frequencies f1, f2, and f3 are different frequencies, for example.
The communication from the base station device (control station 101) to the mobile station device (may be a fixed station device) is downlink communication, and the base station device (control station 101) from the mobile station device (may be a fixed station device). Communication to is upstream communication.

FIG. 2 is a block diagram for explaining the configuration of a mobile station that is a wireless terminal according to an embodiment of the present invention.
In FIG. 2, a radio terminal 200 includes a control unit 201, a DSP (Digital Signal Processor) unit 202, a transmission unit 203, reception units 204 and 205, a shared machine 206, an antenna 207, a speech encoding / decoding device unit 208, a switching 209, 212, 214, speaker 210, attenuation unit 211, handset 217, and display unit 218.

The handset 217 includes a receiver 213, a microphone 215, and a PTT (Push To Talk) 216.
The control unit 201 is a CPU (Central Processing Unit) that performs control in the wireless terminal 200.
In the wireless terminal 200, one transmission unit 203 and two reception units 204 and 205 are connected to an antenna 207 via a shared machine 206 for transmission and reception. Since there are two receiving units 204 and 205, the base station wave and the direct wave can be received simultaneously.
Since the control unit has the two receiving units 204 and 205, channel search can be simultaneously performed for each receiving unit.

The DSP unit 202 performs signal processing of radio signals. The voice encoding / decoding device unit 208 encodes and decodes a voice signal. The switching unit 209 turns on / off the audio signal transmitted to the speaker 210. The switching unit 212 turns on / off the signal transmitted to the receiver 213. The switching unit 214 turns on / off the audio signal from the microphone.
The attenuation unit 211 adjusts the signal level of the signal transmitted to the receiver 213.
When the PTT 216 is pressed, it is detected by the control unit 201, and the switching unit 214 is turned on and voice transmission is started. When the PTT 216 is released, the switching unit 214 is turned off and voice transmission is stopped.
The display unit 218 displays the status of the wireless terminal 200 and the like.

An embodiment of the present invention will be described with reference to FIGS.
FIG. 3 is a state transition diagram for explaining channel scanning of a wireless terminal according to an embodiment of the present invention.
In FIG. 3, the wireless terminal performs a preset operation (301). In the preset operation, when the user selects a preset communication channel, standby and communication are performed on a fixed channel.
When the SCAN button not shown in FIG. 2 is pressed (304), the preset operation is switched to the scan mode (307), and the channel scan (302) is started.
In the one time scan mode, when a channel in which a voice call is made is found by channel scan (302) (308), the scan mode is terminated and the process returns to the preset operation (301). At this time, the voice reception operation on the supplemented channel is continued.

In the endless scan mode, when a channel in which a voice call is made is found by channel scan (302) (305), the channel monitor (303) is displayed. The channel monitor (303) performs channel monitor display and performs voice reception operation.
In the channel scan (302) state, when the SCAN button is pressed, the call is terminated, or a timeout occurs (305), the process returns to the channel scan (302).
In the endless scan mode in the scan mode (307), the channel monitor is displayed on the channel monitor (303) after the call is captured.
When the SCAN button is pressed long (309) in the scan mode (307), the process returns to the preset operation (301).

FIG. 4 is a flowchart for explaining the channel scan operation of the wireless terminal according to the embodiment of the present invention.
FIG. 5 is a display diagram for explaining display contents on the display unit of the wireless terminal according to the embodiment of the present invention.
In FIG. 4, the control unit 201 performs a preset operation as a reception start (S401), and proceeds to the process of S402.
In step S402, it is determined whether the scan (SCAN) button is pressed. If the button is not pressed (NO), the process returns to step S401. If the button is pressed (YES), the process proceeds to step S403.
In S403, channel scan display is performed, and the process proceeds to S404. FIG. 5A is a channel scan display diagram displayed on the display unit 218.

In S404, a channel scan operation for capturing voice communication is performed, and the process proceeds to S405.
In S405, it is determined whether or not voice communication is captured. If voice communication can be captured (YES), the process proceeds to S407. If voice communication cannot be captured (NO), the process proceeds to S406.
In S406, it is determined whether or not the scan (SCAN) button is pressed for a long time. If the button is pressed for a long time (YES), the process returns to S401. If the button is not pressed (NO), the process returns to S404.
In S407, the received voice is output from the speaker 210, and the process proceeds to S408.

In S408, it is determined whether the channel scan is an endless scan. If the scan is an endless scan (YES), the process proceeds to S410. If the scan is an endless scan (NO), the process proceeds to S409.
In the case of the endless scan, for example, when the scan button of the mobile station is pressed by the user operation, the channel scan is started. The channel scan sequentially changes the reception frequency of the receiving unit to determine the presence or absence of a call. When there is a call, the scan is stopped and the received voice signal is decoded by the voice encoding / decoding device unit 208 as a channel monitor. Output from the speaker 210. In this state, when the receiving unit detects the end of communication (sky line or wave break), the channel scan is started again.

In S409, the communication unit is displayed on the display unit 218, and the process returns to S401.
In S410, channel monitor display is performed, and the process proceeds to S411. FIG. 5B is a channel monitor display diagram displayed on the display unit 218.

In S411, it is determined whether or not communication is completed. If communication is completed (YES), the process proceeds to S417. If communication is not completed (NO), the process proceeds to S412.
In S412, the presence / absence of timeout setting is determined. If the setting is present (YES), the process proceeds to S413. If the setting is not present (NO), the process returns to S411.

If there is a timeout setting, the channel scan in which the timeout has occurred is resumed even if the call is not terminated. Presence / absence of timeout and time are preset for each frequency. During channel monitoring, information on the received frequency (channel name, etc.) is displayed, and further displayed with an icon or the like so that it can be identified that channel monitoring is in progress.
In the case of 1 time scan (1 Time SCAN), for example, when a scan button of a mobile station is pressed by a user operation, a channel scan is started. In the channel scan, the reception frequency of the reception unit is sequentially changed to determine the presence / absence of a call, and when there is a call, the scan is stopped, and the received audio signal is decoded by the audio encoding / decoding device unit 208 from the speaker 210. Output. At this time, the channel scan mode returns to the normal preset operation. Even after returning to the preset operation, reception and speaker output on the above-described channel continue. Whether the endless scan or the one-time scan is performed is set in advance before the scan is started. Either endless scan / 1 time scan may be set for each scan list, and the user may select the scan list, or the endless scan or 1 time scan may be directly selected.
In addition, ARIB STD-T61 defines selecole communication specifying a communication partner.
In a normal preset operation, when a selecole communication that is not the subject of a call is received, the received voice is not output from the speaker as the other talk state. When the selecole communication is captured by scanning, the received voice is output from the speaker 210 by setting the other-talk monitor state even if it is not the subject of the call.

In S413, it is determined whether a predetermined time of, for example, about 10 seconds has elapsed. If the predetermined time has elapsed (YES), the process proceeds to S417, and if the predetermined time has not elapsed (NO) The process proceeds to S414. A certain time can be set for each channel, and a setting that does not time out is also possible. Thus, importance can be given to each channel.
In S414, it is determined whether or not the scan button is short-pressed. If the short-press is made (YES), the process proceeds to S415. If the short-press is not made (NO), the process returns to S411.
In S415, it is determined whether or not the scan button is long-pressed. If the long press is made (YES), the process proceeds to S416. If the long press is not made (NO), the process proceeds to S417.
In S416, a display during communication is displayed on the display unit 218, and the process returns to S401.
In S417, the received voice is stopped and the process returns to S403.
As a result, the channel scan is resumed in the case of a single press, and the operation returns to the preset in the case of a long press.

An embodiment of the above-described channel scan (S404 in FIG. 4) of the present invention will be described with reference to FIGS.
In ARIB STD-T61, base station communication and direct communication are performed using the radio channel shown in FIGS.
FIG. 6 is a diagram for explaining a physical radio channel configuration of a radio terminal according to an embodiment of the present invention. The physical radio channel configuration in FIG. 6 includes a physical radio channel and a functional channel.
FIG. 7 is a diagram for explaining a communication channel signal format of a wireless terminal according to an embodiment of the present invention. The communication channel signal format in FIG. 7 is the same for uplink / downlink.
FIG. 8 is a diagram for explaining an RICH configuration example of a radio terminal according to an embodiment of the present invention. As shown in FIG. 8, a configuration example of RICH is convolutionally encoded and arranged on a radio channel.
FIG. 9 is a diagram for explaining a synchronization burst signal format and a PICH configuration example of a wireless terminal according to an embodiment of the present invention. The signal format of the synchronization burst in FIG. 9 is the same for uplink / downlink.
The base station includes a regular transmission base station that always transmits and an emergency transmission base station that transmits only during communication. When the regular transmission base station is not in communication, an empty line is set in the M communication mode identification of RICH and transmitted.
FIG. 11 is a diagram for explaining identification information of a wireless terminal according to another embodiment of the present invention.
FIG. 11A shows communication channel identification information during communication between a base station and a mobile station.
FIG. 11B shows communication channel identification information during direct communication between mobile stations.

  When channel scanning is performed using a scan list (not shown), channels are selected in ascending order from the scan list, and after scanning to the end of the list, scanning is performed from the top.

FIG. 12 is a flowchart for explaining the channel scan operation of the wireless terminal according to the embodiment of the present invention.
In the case of a two-wave receiver, the flowchart of FIG. 12 is applied to each of the base wave receiver and the direct wave receiver. In the flowchart of each receiver, the state “searching, waiting for switching” is stored in the table, and the state is changed according to the processing state. With reference to this state, the channels are switched when both are "waiting for switching". Thus, the base wave and direct wave channels can be switched in synchronization. For example, there is an effect when a certain time has passed in the determination of the base wave processing, but no fixed time has passed in the determination of the direct wave processing.

In FIG. 12, it is determined that “the received electric field is equal to or greater than the threshold” (S1202) before the “frame reception process” (S1201) is performed.
As a result, when the received electric field is less than the threshold value, it can be determined that there is no call without performing the frame reception process, so that the time for scanning one channel can be shortened.
In FIG. 12, the control unit 201 performs channel setting in S1201, and proceeds to the processing in S1202.
In S1202, the received electric field is compared with a preset threshold. If the received electric field is greater than or equal to the threshold (YES), the process proceeds to S1203, and if less than the threshold (NO), the process returns to S1201.
As a result, when the received electric field is less than the threshold value, it can be determined that there is no call without performing the frame reception process, so the time for scanning one channel can be shortened.

In S1203, a frame reception process is performed, and the process proceeds to S1204.
In S1204, it is determined whether a signal has been received. If received (YES), the process proceeds to S1205. If not received (NO), the process proceeds to S1209.
In S1205, a voice determination process is performed, and the process proceeds to S1206.
In the voice determination process of S1205, the channel operation state is identified from the received RICH and the determination is performed.
The channel operation state is determined using the determination table of FIG.
In FIG. When the synchronous burst is being transmitted, it is determined as “hold”.
2 in FIG. When voice communication is in progress, it is determined as “voice”.
3 in FIG. It is determined that “other than voice” while sending an empty signal.
4 in FIG. While the BUSY signal is being transmitted, it is determined that “other than audio”.
Similarly, as shown in 1. of FIG. When the synchronous burst is being transmitted, it is determined as “hold”.
2 in FIG. When voice communication is in progress, it is determined as “voice”.
Further, in the system, communication channel identification information can be assigned to an undefined region of the synchronous burst signal PICH, and the channel operation state can be specified and determined using the identification information.
Thereby, it becomes possible to determine “voice” and “other than voice” from the synchronization burst, and the channel scan efficiency can be improved.

In S1206, it is determined whether or not the received signal is sound. If it is sound (YES), the process ends. If it is not sound (NO), the process proceeds to S1207.
In S1207, it is determined whether or not the process is on hold. If the process is on hold (YES), the process proceeds to S1210. If the process is not on hold (NO), the process proceeds to S1208.

In S1208, it is determined whether the received signal is other than an audio signal. If the received signal is not an audio signal (YES), the process returns to S1201. If the received signal is an audio signal (NO), the process proceeds to S1209.
In S1209, it is determined whether or not a predetermined time set in advance has elapsed since the channel setting in S1201, and if the predetermined fixed time has not passed (NO), the process returns to S1203, If the predetermined time has elapsed (YES), the process returns to S1201.

In S1210, a frame reception process is performed, and the process proceeds to S1211.
In S1211, it is determined whether a signal has been received. If received (YES), the process proceeds to S1212. If not received (NO), the process proceeds to S1215.
In S1212, a voice determination process is performed, and the process proceeds to S1213.

In S1213, it is determined whether or not the received signal is sound. If it is sound (YES), the process ends. If it is not sound (NO), the process proceeds to S1214.
In S1214, it is determined whether the received signal is other than an audio signal. If the received signal is not an audio signal (YES), the process returns to S1201. If the received signal is an audio signal (NO), the process proceeds to S1215.
In S1215, it is determined whether or not a predetermined constant time set in advance has elapsed since it was determined in S1207 to be on hold. If the predetermined fixed time has not elapsed (NO), the process returns to S1210, If the predetermined time has elapsed (YES), the process returns to S1201.
Note that the predetermined fixed time in S1209 and the predetermined fixed time in S1215 may be the same or different.
FIG. 10 shows the operation of the flowchart of FIG. 12 as a state transition diagram.

  According to the present invention, it is possible to perform channel scanning regardless of the environment in which the mobile station is located (such as under the regular transmission base station, under the emergency transmission base station, or outside the service area).

  Further, according to the present invention, in a region where the wireless terminal is operated at a plurality of frequencies, a call is performed at a different frequency in the same region by restarting the scan when the call captured by the scan is completed. Even in this case, it becomes possible to monitor the call by scanning again. Furthermore, since a time-out period is provided for a frequency at which periodic communication is expected to be performed and scanning is resumed without waiting for the end of the call, the possibility of missing a call made at another frequency is reduced.

  Although the present invention has been described in detail above, it is needless to say that the present invention is not limited to the wireless terminals described here and can be widely applied to wireless terminals other than those described above.

  200: Wireless terminal 201: Control unit 202: DSP unit 203: Transmission unit 204, 205: Reception unit 206: Shared machine 207: Antenna 208: Speech encoding / decoding device unit 209, 212 , 214: switching unit, 210: speaker, 211: attenuation unit, 213: receiver, 215: microphone, 216: PTT, 217: handset, 218: display unit.

Claims (6)

Direct wave reception received when communicating directly with a mobile station apparatus or a fixed station apparatus via a base station apparatus and a base wave receiving section that is received without communicating with a base station apparatus A plurality of receiving units that can simultaneously receive two different frequencies, and each receiving unit of the base wave receiving unit and the direct wave receiving unit selects a preset communication channel and performs a receiving operation A wireless terminal,
The wireless terminal has a scan mode for performing a channel scan,
When a channel scan execution instruction is made, each reception unit of the base wave reception unit and the direct wave reception unit performs a frame reception process by changing a reception channel according to a preset channel list,
It is determined whether communication is being performed in the current channel by the frame reception process,
If communication is performed in the determination result, it is determined whether the channel on which the communication is performed is voice communication,
If the determination result is voice communication, the received voice is output,
When communication is not performed by the frame reception process or when the communication is performed is not voice communication, the reception channels of the base wave reception unit and the direct wave reception unit are again synchronized according to the channel list. A wireless terminal characterized by switching and repeating channel scanning. The wireless terminal according to claim 1,
In the channel where the scanned channel is voice communication and the received voice is output,
A radio terminal characterized in that when the communication of the channel is completed, the reception channel is changed again according to the channel list and the channel scan is resumed. The wireless terminal according to claim 2, wherein
In the channel where the scanned channel is voice communication and the received voice is output,
Even if the communication of the channel does not end,
A radio terminal characterized by changing a reception channel again according to a channel list and restarting channel scanning. The wireless terminal according to claim 2, wherein
A radio terminal characterized in that when a scan channel is a voice communication and a received voice is output, the scan mode is stopped while maintaining the current channel when an instruction to stop the scan mode is given. The wireless terminal according to claim 1,
In the channel where the scanned channel is voice communication and the received voice is output,
A wireless terminal characterized by continuing to wait for communication on the channel when communication on the channel ends. The wireless terminal according to claim 1,
In the channel where the scanned channel is voice communication and the received voice is output,
When the communication of the channel is completed, the scan mode for changing the reception channel again according to the channel list and restarting the channel scan,
A wireless terminal characterized in that, when communication on the channel is completed, two modes can be selected: a scan mode in which communication standby on the channel is continued.

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